scoutfs: introduce CodingStyle.txt

Add a coding style document that tries to record the conventions that
the project uses.  It seemed more appropriate to put it up in the -kmod
git repo context rather than in src/ which would end up in fs/scoutfs/
upstream.

Signed-off-by: Zach Brown <zab@versity.com>

CodingStyle.txt

@@ -0,0 +1,82 @@
+
+We try to maintain a consistent coding style across the project.  It's
+admitedly arbitrary and starts with and is based on upstream's
+Documentation/CodingStyle.  Conventions are added here as they come up
+during review.  We'll demonstrate each sylistic preference with a diff
+snippet.
+
+== Try to make one exit point for reasonably long functions
+
+{
+-	void *a;
+-	void *b;
++	void *a = NULL;
++	void *b = NULL;
++	int ret;
+
+	a = kalloc();
+-	if (!a)
+-		return 1;
++	if (!a) {
++		ret = 1;
++		goto out;
++	}
+
+	b = kalloc();
+	if (!b) {
+-		kfree(a);
+-		return 2;
++		ret = 2;
++		goto out;
+	}
+
+-	return 3
++	ret = 3;
++out:
++	kfree(a);
++	kfree(b);
++	return ret;
+}
+
+The idea is to initialize all state at the top of the function,
+modifying it throughout, and clean it all up at the end.  Having one
+exit point also gives us a place to add tracing of function exit.
+
+== Multiple declarations on a line
+
+-	int i, j;
++	int i;
++	int j;
+
+Declare function variables one per line.  The verbose declarations
+create pressure to think about excessive stack use or over-long
+functions, makes initializers clear, and leaves room for comments.
+
+== Balance braces
+
+-	if (IS_ERR(super_block))
++	if (IS_ERR(super_block)) {
+		return PTR_ERR(super_block);
+-	else {
++	} else {
+		*super_res = *super_block;
+		kfree(super_block);
+		return 0;
+	}
+
+*nervous twitch*
+
+== Cute variable defintion waterfalls
+
++	struct block_device *meta_bdev;
+	struct scoutfs_sb_info *sbi;
+	struct mount_options opts;
+-	struct block_device *meta_bdev;
+	struct inode *inode;
+
+This isn't strictly necessary, but it's nice to try and make a pretty
+descending length of variable distributions.  It often has the
+accidental  effect of sorting definitions by decreasing complexity.  I
+tend to group types when the name lengths are pretty close, even if
+they're not strictly sorted, so that all the ints, u64s, keys, etc, are
+all together.

README.md

@@ -1,24 +1,135 @@
 # Introduction
 
-scoutfs is a clustered in-kernel Linux filesystem designed to support
-large archival systems.  It features additional interfaces and metadata
-so that archive agents can perform their maintenance workflows without
-walking all the files in the namespace.  Its cluster support lets
-deployments add nodes to satisfy archival tier bandwidth targets.
+scoutfs is a clustered in-kernel Linux filesystem designed and built
+from the ground up to support large archival systems.
 
-The design goal is to reach file populations in the trillions, with the
-archival bandwidth to match, while remaining operational and responsive.
+Its key differentiating features are:
 
-Highlights of the design and implementation include:
+ - Integrated consistent indexing accelerates archival maintenance operations
+ - Commit logs allow nodes to write concurrently without contention
+
+It meets best of breed expectations:
 
  * Fully consistent POSIX semantics between nodes
+ * Rich metadata to ensure the integrity of metadata references
  * Atomic transactions to maintain consistent persistent structures
- * Integrated archival metadata replaces syncing to external databases
- * Dynamic seperation of resources lets nodes write in parallel
- * 64bit throughout; no limits on file or directory sizes or counts
+ * First class kernel implementation for high performance and low latency
  * Open GPLv2 implementation
+ 
+Learn more in the [white paper](https://docs.wixstatic.com/ugd/aaa89b_88a5cc84be0b4d1a90f60d8900834d28.pdf).
+
+# Current Status
+
+**Alpha Open Source Development**
+
+scoutfs is under heavy active development.  We're developing it in the
+open to give the community an opportunity to affect the design and
+implementation.
+
+The core architectural design elements are in place.  Much surrounding
+functionality hasn't been implemented.  It's appropriate for early
+adopters and interested developers, not for production use.
+
+In that vein, expect significant incompatible changes to both the format
+of network messages and persistent structures. Since the format hash-checking
+has now been removed in preparation for release, if there is any doubt, mkfs
+is strongly recommended.
+
+The current kernel module is developed against the RHEL/CentOS 7.x
+kernel to minimize the friction of developing and testing with partners'
+existing infrastructure.  Once we're happy with the design we'll shift
+development to the upstream kernel while maintaining distro
+compatibility branches.
 
 # Community Mailing List
 
 Please join us on the open scoutfs-devel@scoutfs.org [mailing list
 hosted on Google Groups](https://groups.google.com/a/scoutfs.org/forum/#!forum/scoutfs-devel)
+for all discussion of scoutfs.
+
+# Quick Start
+
+**This following a very rough example of the procedure to get up and
+running, experience will be needed to fill in the gaps.  We're happy to
+help on the mailing list.**
+
+The requirements for running scoutfs on a small cluster are:
+
+ 1. One or more nodes running x86-64 CentOS/RHEL 7.4 (or 7.3)
+ 2. Access to two shared block devices
+ 3. IPv4 connectivity between the nodes
+
+The steps for getting scoutfs mounted and operational are:
+
+ 1. Get the kernel module running on the nodes
+ 2. Make a new filesystem on the devices with the userspace utilities
+ 3. Mount the devices on all the nodes
+
+In this example we use three nodes.  The names of the block devices are
+the same on all the nodes.  Two of the nodes will be quorum members.  A
+majority of quorum members must be mounted to elect a leader to run a
+server that all the mounts connect to.  It should be noted that two
+quorum members results in a majority of one, each member itself, so
+split brain elections are possible but so unlikely that it's fine for a
+demonstration.
+
+1. Get the Kernel Module and Userspace Binaries
+
+   * Either use snapshot RPMs built from git by Versity:
+
+   ```shell
+   rpm -i https://scoutfs.s3-us-west-2.amazonaws.com/scoutfs-repo-0.0.1-1.el7_4.noarch.rpm
+   yum install scoutfs-utils kmod-scoutfs
+   ```
+
+   * Or use the binaries built from checked out git repositories:
+
+   ```shell
+   yum install kernel-devel
+   git clone git@github.com:versity/scoutfs.git
+   make -C scoutfs
+   modprobe libcrc32c
+   insmod scoutfs/kmod/src/scoutfs.ko
+   alias scoutfs=$PWD/scoutfs/utils/src/scoutfs
+   ```
+
+2. Make a New Filesystem (**destroys contents**)
+
+   We specify quorum slots with the addresses of each of the quorum
+   member nodes, the metadata device, and the data device.
+
+   ```shell
+   scoutfs mkfs -Q 0,$NODE0_ADDR,12345 -Q 1,$NODE1_ADDR,12345 /dev/meta_dev /dev/data_dev
+   ```
+
+3. Mount the Filesystem
+
+   First, mount each of the quorum nodes so that they can elect and
+   start a server for the remaining node to connect to.  The slot numbers
+   were specified with the leading "0,..."  and "1,..." in the mkfs options
+   above.
+
+   ```shell
+   mount -t scoutfs -o quorum_slot_nr=$SLOT_NR,metadev_path=/dev/meta_dev /dev/data_dev /mnt/scoutfs
+   ```
+
+   Then mount the remaining node which can now connect to the running server.
+
+   ```shell
+   mount -t scoutfs -o metadev_path=/dev/meta_dev /dev/data_dev /mnt/scoutfs
+   ```
+
+4. For Kicks, Observe the Metadata Change Index
+
+   The `meta_seq` index tracks the inodes that are changed in each
+   transaction.
+
+   ```shell
+   scoutfs walk-inodes meta_seq 0 -1 /mnt/scoutfs
+   touch /mnt/scoutfs/one; sync
+   scoutfs walk-inodes meta_seq 0 -1 /mnt/scoutfs
+   touch /mnt/scoutfs/two; sync
+   scoutfs walk-inodes meta_seq 0 -1 /mnt/scoutfs
+   touch /mnt/scoutfs/one; sync
+   scoutfs walk-inodes meta_seq 0 -1 /mnt/scoutfs
+   ```

ReleaseNotes.md

@@ -1,310 +0,0 @@
-Versity ScoutFS Release Notes
-=============================
-
----
-v1.17
-\
-*Oct 23, 2023*
-
-Add support for EL8 generation kernels.
-
----
-v1.16
-\
-*Oct 4, 2023*
-
-Fix an issue where the server could hang on startup if its persistent
-allocator structures were left in a specific degraded state by the
-previously active server.
-
----
-v1.15
-\
-*Jul 17, 2023*
-
-Process log btree merge splicing in multiple commits.  This prevents a
-rare case where pending log merge completions contain more work than can
-be done in a single server commit, causing the server to trigger an
-assert shortly after starting.
-
-Fix spurious EINVAL from data writes when data\_prealloc\_contig\_only was
-set to 0.
-
----
-v1.14
-\
-*Jun 29, 2023*
-
-Add get\_referring\_entries ioctl for getting directory entries that
-refer to an inode.
-
-Fix excessive CPU use in the move\_blocks interface when moving a large
-number of extents.
-
-Reduce fragmented data allocation when contig\_only prealloc is not in
-use by more consistently allocating multi-block extents within each
-aligned prealloc region.
-
-Avoid rare deadlock in metadata block cache recalim under both heavy
-load and memory pressure.
-
-Fix crash when using quorum\_heartbeat\_timeout\_ms mount option.
-
----
-v1.13
-\
-*May 19, 2023*
-
-Add the quorum\_heartbeat\_timeout\_ms mount option to set the quorum
-heartbeat timeout.
-
-Change some task prioritization and allocation behavior of the quorum
-agent to help reduce delays in sending and receiving heartbeat messages.
-
----
-v1.12
-\
-*Apr 17, 2023*
-
-Add the prepare-empty-data-device scoutfs command.  A data device can be
-unused when no files have data blocks, perhaps because they're archived
-and offline.  In this case the data device can be swapped out for
-another device without changes to the metadata device.
-
-Fix an oversight which limited inode timestamps to second granularity
-for some operations.  All operations now record timestamps with full
-nanosecond precision.
-
-Fix spurious ENOENT failures when renaming from other directories into
-the root directory.
-
----
-v1.11
-\
-*Feb 2, 2023*
-
-Fixed a free extent processing error that could prevent mount from
-proceeding when free data extents were sufficiently fragmented.  It now
-properly handle very fragmented free extent maps.
-
-Fixed a statfs server processing race that could return spurious errors
-and shut down the server.  With the race closed statfs processing is
-reliable.
-
-Fixed a rare livelock in the move\_blocks ioctl.  With the right
-relationship between ioctl arguments and eventual file extent items the
-core loop in the move\_blocks ioctl could get stuck looping on an extent
-item and never return.  The loop exit conditions were fixed and the loop
-will always advance through all extents.
-
-Changed the 'print' scoutfs commands to flush the block cache for the
-devices.  It was inconvenient to expect cache flushing to be a separate
-step to ensure consistency with remote node writes.
-
----
-v1.10
-\
-*Dec 7, 2022*
-
-Fixed a potential directory entry cache management deadlock that could
-occur when many nodes performed heavy metadata write loads across shared
-directories and their child subdirectories.  The deadlock could halt
-invalidation progress on a node which could then stop use of locks that
-needed invalidation on that node which would result in almost all tasks
-hanging on those locks that would never make progress. 
-
-Fixed a circumstance where metadata change sequence index item
-modification could leave behind old stale metadata sequence items.  The
-duplication case required concurrent metadata updates across mounts with
-particular open transaction patterns so the duplicate items are rare.
-They resulted in a small amount of additional load when walking change
-indexes but had no effect on correctness.
-
-Fixed a rare case where sparse file extension might not write partial
-blocks of zeros which was found in testing.  This required using
-truncate to extend files past file sizes that end in partial blocks
-along with the right transaction commit and memory reclaim patterns.
-This never affected regular non-sparse files nor files prepopulated with
-fallocate.
-
----
-v1.9
-\
-*Oct 29, 2022*
-
-Fix VFS cached directory entry consistency verification that could cause
-spurious "no such file or directory" (ENOENT) errors from rename over
-NFS under certain conditions.  The problem was only every with the
-consistency of in-memory cached dentry objects, persistent data was
-correct and eventual eviction of the bad cached objects would stop
-generating the errors.
-
----
-v1.8
-\
-*Oct 18, 2022*
-
-Add support for Linux POSIX Access Control Lists, as described in
-acl(5).  Mount options are added to enable ("acl") and disable ("noacl")
-support.  The default is to support ACLs.  ACLs are stored in the
-existing extended attribute scheme so adding support is does not require
-a format change.
-
-Add options to control data extent preallocation.  The default behavior
-does not change.  The options can relax the limits on preallocation
-which will then trigger under more write patterns and increase the risk
-of preallocated space which is never used.  The options are described in
-scoutfs(5).
-
----
-v1.7
-\
-*Aug 26, 2022*
-
-* **Fixed possible persistent errors moving freed data extents**
-\
-  Fixed a case where the server could hit persistent errors trying to
-  move a client's freed extents in one commit.  The client had to free
-  a large number of extents that occupied distant positions in the
-  global free extent btree.  Very large fragmented files could cause
-  this.  The server now moves the freed extents in multiple commits and
-  can always ensure forward progress.
-
-* **Fixed possible persistent errors from freed duplicate extents**
-\
-  Background orphan deletion wasn't properly synchronizing with
-  foreground tasks deleting very large files.  If a deletion took long
-  enough then background deletion could also attempt to delete inode items
-  while the deletion was making progress.  This could create duplicate
-  deletions of data extent items which causes the server to abort when
-  it later discovers the duplicate extents as it merges free lists.
-
----
-v1.6
-\
-*Jul 7, 2022*
-
-* **Fix memory leaks in rare corner cases**
-\
-  Analysis tools found a few corner cases that leaked small structures,
-  generally around error handling or startup and shutdown.
-
-* **Add --skip-likely-huge scoutfs print command option**
-\
-  Add an option to scoutfs print to reduce the size of the output
-  so that it can be used to see system-wide metadata without being
-  overwhelmed by file-level details.
-
----
-v1.5
-\
-*Jun 21, 2022*
-
-* **Fix persistent error during server startup**
-\
-  Fixed a case where the server would always hit a consistent error on
-  seartup, preventing the system from mounting.  This required a rare
-  but valid state across the clients.
-
-* **Fix a client hang that would lead to fencing**
-\
-  The client module's use of in-kernel networking was missing annotation
-  that could lead to communication hanging.  The server would fence the
-  client when it stopped communicating.  This could be identified by the
-  server fencing a client after it disconnected with no attempt by the
-  client to reconnect.
-
----
-v1.4
-\
-*May 6, 2022*
-
-* **Fix possible client crash during server failover**
-\
-  Fixed a narrow window during server failover and lock recovery that
-  could cause a client mount to believe that it had an inconsistent item
-  cache and panic.  This required very specific lock state and messaging
-  patterns between multiple mounts and multiple servers which made it
-  unlikely to occur in the field.
-
----
-v1.3
-\
-*Apr 7, 2022*
-
-* **Fix rare server instability under heavy load**
-\
-  Fixed a case of server instability under heavy load due to concurrent
-  work fully exhausting metadata block allocation pools reserved for a
-  single server transaction.  This would cause brief interruption as the
-  server shutdown and the next server started up and made progress as
-  pending work was retried.
-
-* **Fix slow fencing preventing server startup**
-\
-  If a server had to process many fence requests with a slow fencing
-  mechanism it could be interrupted before it finished.  The server
-  now makes sure heartbeat messages are sent while it is making progress
-  on fencing requests so that other quorum members don't interrupt the
-  process.
-
-* **Performance improvement in getxattr and setxattr**
-\
-  Kernel allocation patterns in the getxattr and setxattr
-  implementations were causing significant contention between CPUs.  Their
-  allocation strategy was changed so that concurrent tasks can call these
-  xattr methods without degrading performance.
-
----
-v1.2
-\
-*Mar 14, 2022*
-
-* **Fix deadlock between fallocate() and read() system calls**
-\
-  Fixed a lock inversion that could cause two tasks to deadlock if they
-  performed fallocate() and read() on a file at the same time.   The
-  deadlock was uninterruptible so the machine needed to be rebooted.  This
-  was relatively rare as fallocate() is usually used to prepare files
-  before they're used.
-
-* **Fix instability from heavy file deletion workloads**
-\
-  Fixed rare circumstances under which background file deletion cleanup
-  tasks could try to delete a file while it is being deleted by another
-  task.  Heavy load across multiple nodes, either many files being deleted
-  or large files being deleted, increased the chances of this happening.
-  Heavy staging could cause this problem because staging can create many
-  internal temporary files that need to be deleted.
-
----
-v1.1
-\
-*Feb 4, 2022*
-
-
-* **Add scoutfs(1) change-quorum-config command**
-\
-  Add a change-quorum-config command to scoutfs(1) to change the quorum
-  configuration stored in the metadata device while the file system is
-  unmounted.   This can be used to change the mounts that will
-  participate in quorum and the IP addresses they use.
-
-* **Fix Rare Risk of Item Cache Corruption**
-\
-  Code review found a rare potential source of item cache corruption.
-  If this happened it would look as though deleted parts of the filesystem
-  returned, but only at the time they were deleted.  Old deleted items are
-  not affected.  This problem only affected the item cache, never
-  persistent storage.  Unmounting and remounting would drop the bad item
-  cache and resync it with the correct persistent data.
-
----
-v1.0
-\
-*Nov 8, 2021*
-
-
-* **Initial Release**
-\
-  Version 1.0 marks the first GA release.

kmod/Makefile

@@ -31,12 +31,12 @@ TARFILE = scoutfs-kmod-$(RPM_VERSION).tar
 all: module
 
 module:
-	$(MAKE) $(SCOUTFS_ARGS)
-	$(SP) $(MAKE) C=2 CF="-D__CHECK_ENDIAN__" $(SCOUTFS_ARGS)
+	make $(SCOUTFS_ARGS)
+	$(SP) make C=2 CF="-D__CHECK_ENDIAN__" $(SCOUTFS_ARGS)
 
 
 modules_install:
-	$(MAKE) $(SCOUTFS_ARGS) modules_install
+	make $(SCOUTFS_ARGS) modules_install
 
 
 %.spec: %.spec.in .FORCE
@@ -50,4 +50,4 @@ dist: scoutfs-kmod.spec
 	@ tar rf $(TARFILE) --transform="s@\(.*\)@scoutfs-kmod-$(RPM_VERSION)/\1@" scoutfs-kmod.spec
 
 clean:
-	$(MAKE) $(SCOUTFS_ARGS) clean
+	make $(SCOUTFS_ARGS) clean

kmod/scoutfs-kmod.spec.in

@@ -3,28 +3,16 @@
 %define kmod_git_hash @@GITHASH@@
 %define pkg_date %(date +%%Y%%m%%d)
 
-# Disable the building of the debug package(s).
-%define debug_package %{nil}
-
 # take kernel version or default to uname -r
 %{!?kversion: %global kversion %(uname -r)}
 %global kernel_version %{kversion}
 
-%if 0%{?el7}
 %global kernel_source() /usr/src/kernels/%{kernel_version}.$(arch)
-%endif
-%if 0%{?el8}
-%global kernel_source() /usr/src/kernels/%{kernel_version}
-%endif
+%global kernel_release() %{kversion}
 
 %{!?_release: %global _release 0.%{pkg_date}git%{kmod_git_hash}}
 
-%if 0%{?el7}
 Name:           %{kmod_name}
-%endif
-%if 0%{?el8}
-Name:           kmod-%{kmod_name}
-%endif
 Summary:        %{kmod_name} kernel module
 Version:        %{kmod_version}
 Release:        %{_release}%{?dist}
@@ -32,30 +20,24 @@ License:        GPLv2
 Group:          System/Kernel
 URL:            http://scoutfs.org/
 
-%if 0%{?el7}
 BuildRequires:  %{kernel_module_package_buildreqs}
-%endif
-%if 0%{?el8}
-BuildRequires:  elfutils-libelf-devel
-%endif
-BuildRequires:  kernel-devel-uname-r = %{kernel_version}
 BuildRequires:  git
+BuildRequires:  kernel-devel-uname-r = %{kernel_version}
 BuildRequires:  module-init-tools
 
 ExclusiveArch:  x86_64
 
 Source:		%{kmod_name}-kmod-%{kmod_version}.tar
 
-%if 0%{?el7}
 # Build only for standard kernel variant(s); for debug packages, append "debug"
 # after "default" (separated by space)
 %kernel_module_package default
-%endif
 
-%global install_mod_dir extra/%{kmod_name}
-%if 0%{?el8}
-%global flavors_to_build x86_64
-%endif
+# Disable the building of the debug package(s).
+%define debug_package %{nil}
+
+%global install_mod_dir extra/%{name}
+
 
 %description
 %{kmod_name} - kernel module
@@ -84,7 +66,7 @@ export INSTALL_MOD_DIR=%{install_mod_dir}
 mkdir -p %{install_mod_dir}
 for flavor in %{flavors_to_build}; do
 	export KSRC=%{kernel_source $flavor}
-	export KVERSION=%{kversion}
+	export KVERSION=%{kernel_release $KSRC}
 	install -d $INSTALL_MOD_PATH/lib/modules/$KVERSION/%{install_mod_dir}
 	cp $PWD/obj/$flavor/src/scoutfs.ko $INSTALL_MOD_PATH/lib/modules/$KVERSION/%{install_mod_dir}/
 done
@@ -92,14 +74,6 @@ done
 # mark modules executable so that strip-to-file can strip them
 find %{buildroot} -type f -name \*.ko -exec %{__chmod} u+x \{\} \;
 
-%if 0%{?el8}
-%files
-/lib/modules
-
-%post
-weak-modules --add-kernel --no-initramfs
-depmod -a
-%endif
 
 %clean
 rm -rf %{buildroot}

kmod/src/Makefile

@@ -8,7 +8,6 @@ CFLAGS_scoutfs_trace.o = -I$(src) # define_trace.h double include
 -include $(src)/Makefile.kernelcompat
  
 scoutfs-y +=			\
-	acl.o			\
 	avl.o			\
 	alloc.o			\
 	block.o			\
@@ -19,22 +18,18 @@ scoutfs-y +=			\
 	dir.o			\
 	export.o		\
 	ext.o			\
-	fence.o			\
 	file.o			\
 	forest.o		\
 	inode.o			\
 	ioctl.o			\
 	item.o			\
-	kernelcompat.o		\
 	lock.o			\
 	lock_server.o		\
 	msg.o			\
 	net.o			\
-	omap.o			\
 	options.o		\
 	per_task.o		\
 	quorum.o		\
-	recov.o			\
 	scoutfs_trace.o		\
 	server.o		\
 	sort_priv.o		\
@@ -45,7 +40,6 @@ scoutfs-y +=			\
 	trans.o			\
 	triggers.o		\
 	tseq.o			\
-	volopt.o		\
 	xattr.o
 
 #

kmod/src/Makefile.kernelcompat

@@ -26,16 +26,6 @@ ifneq (,$(shell grep 'dir_emit_dots' include/linux/fs.h))
 ccflags-y += -DKC_DIR_EMIT_DOTS
 endif
 
-#
-# v3.18-rc2-19-gb5ae6b15bd73
-# 
-# Folds d_materialise_unique into d_splice_alias. Note reversal
-# of arguments (Also note Documentation/filesystems/porting.rst)
-#
-ifneq (,$(shell grep 'd_materialise_unique' include/linux/dcache.h))
-ccflags-y += -DKC_D_MATERIALISE_UNIQUE=1
-endif
-
 #
 # RHEL extended the fop struct so to use it we have to set
 # a flag to indicate that the struct is large enough and
@@ -44,217 +34,3 @@ endif
 ifneq (,$(shell grep 'FMODE_KABI_ITERATE' include/linux/fs.h))
 ccflags-y += -DKC_FMODE_KABI_ITERATE
 endif
-
-#
-# v4.7-rc2-23-g0d4d717f2583
-#
-# Added user_ns argument to posix_acl_valid
-#
-ifneq (,$(shell grep 'posix_acl_valid.*user_namespace' include/linux/posix_acl.h))
-ccflags-y += -DKC_POSIX_ACL_VALID_USER_NS
-endif
-
-#
-# v5.3-12296-g6d2052d188d9
-#
-# The RBCOMPUTE function is now passed an extra flag, and should return a bool
-# to indicate whether the propagated callback should stop or not.
-#
-ifneq (,$(shell grep 'static inline bool RBNAME.*_compute_max' include/linux/rbtree_augmented.h))
-ccflags-y += -DKC_RB_TREE_AUGMENTED_COMPUTE_MAX
-endif
-
-#
-# v3.13-25-g37bc15392a23
-#
-# Renames posix_acl_create to __posix_acl_create and provide some
-# new interfaces for creating ACLs
-#
-ifneq (,$(shell grep '__posix_acl_create' include/linux/posix_acl.h))
-ccflags-y += -DKC___POSIX_ACL_CREATE
-endif
-
-#
-# v4.8-rc1-29-g31051c85b5e2
-#
-# inode_change_ok() removed - replace with setattr_prepare()
-#
-ifneq (,$(shell grep 'extern int setattr_prepare' include/linux/fs.h))
-ccflags-y += -DKC_SETATTR_PREPARE
-endif
-
-#
-# v4.15-rc3-4-gae5e165d855d
-#
-# linux/iversion.h needs to manually be included for code that
-# manipulates this field.
-#
-ifneq (,$(shell grep -s 'define _LINUX_IVERSION_H' include/linux/iversion.h))
-ccflags-y += -DKC_NEED_LINUX_IVERSION_H=1
-endif
-
-# v4.11-12447-g104b4e5139fe
-#
-# Renamed __percpu_counter_add to percpu_counter_add_batch to clarify
-# that the __ wasn't less safe, just took an extra parameter.
-#
-ifneq (,$(shell grep 'percpu_counter_add_batch' include/linux/percpu_counter.h))
-ccflags-y += -DKC_PERCPU_COUNTER_ADD_BATCH
-endif
-
-#
-# v4.11-4550-g7dea19f9ee63
-#
-# Introduced memalloc_nofs_{save,restore} preferred instead of _noio_.
-#
-ifneq (,$(shell grep 'memalloc_nofs_save' include/linux/sched/mm.h))
-ccflags-y += -DKC_MEMALLOC_NOFS_SAVE
-endif
-
-#
-# v4.7-12414-g1eff9d322a44
-#
-# Renamed bi_rw to bi_opf to force old code to catch up.  We use it as a
-# single switch between old and new bio structures.
-#
-ifneq (,$(shell grep 'bi_opf' include/linux/blk_types.h))
-ccflags-y += -DKC_BIO_BI_OPF
-endif
-
-#
-# v4.12-rc2-201-g4e4cbee93d56
-#
-# Moves to bi_status BLK_STS_ API instead of having a mix of error
-# end_io args or bi_error.
-#
-ifneq (,$(shell grep 'bi_status' include/linux/blk_types.h))
-ccflags-y += -DKC_BIO_BI_STATUS
-endif
-
-#
-# v3.11-8765-ga0b02131c5fc
-#
-# Remove the old ->shrink() API, ->{scan,count}_objects is preferred.
-#
-ifneq (,$(shell grep '(*shrink)' include/linux/shrinker.h))
-ccflags-y += -DKC_SHRINKER_SHRINK
-endif
-
-#
-# v3.19-4777-g6bec00352861
-#
-# backing_dev_info is removed from address_space. Instead we need to use
-# inode_to_bdi() inline from <backing-dev.h>.
-#
-ifneq (,$(shell grep 'struct backing_dev_info.*backing_dev_info' include/linux/fs.h))
-ccflags-y += -DKC_LINUX_BACKING_DEV_INFO=1
-endif
-
-#
-# v4.3-9290-ge409de992e3e
-#
-# xattr handlers are now passed a struct that contains `flags`
-#
-ifneq (,$(shell grep 'int...get..const struct xattr_handler.*struct dentry.*dentry,' include/linux/xattr.h))
-ccflags-y += -DKC_XATTR_STRUCT_XATTR_HANDLER=1
-endif
-
-#
-# v4.16-rc1-1-g9b2c45d479d0
-#
-# kernel_getsockname() and kernel_getpeername dropped addrlen arg
-#
-ifneq (,$(shell grep 'kernel_getsockname.*,$$' include/linux/net.h))
-ccflags-y += -DKC_KERNEL_GETSOCKNAME_ADDRLEN=1
-endif
-
-#
-# v4.1-rc1-410-geeb1bd5c40ed
-#
-# Adds a struct net parameter to sock_create_kern
-#
-ifneq (,$(shell grep 'sock_create_kern.*struct net' include/linux/net.h))
-ccflags-y += -DKC_SOCK_CREATE_KERN_NET=1
-endif
-
-#
-# v3.18-rc6-1619-gc0371da6047a
-#
-# iov_iter is now part of struct msghdr
-#
-ifneq (,$(shell grep 'struct iov_iter.*msg_iter' include/linux/socket.h))
-ccflags-y += -DKC_MSGHDR_STRUCT_IOV_ITER=1
-endif
-
-#
-# v4.17-rc6-7-g95582b008388
-#
-# Kernel has current_time(inode) to uniformly retreive timespec in the right unit
-#
-ifneq (,$(shell grep 'extern struct timespec64 current_time' include/linux/fs.h))
-ccflags-y += -DKC_CURRENT_TIME_INODE=1
-endif
-
-#
-# v4.9-12228-g530e9b76ae8f
-#
-# register_cpu_notifier and family were all removed and to be
-# replaced with cpuhp_* API calls.
-#
-ifneq (,$(shell grep 'define register_hotcpu_notifier' include/linux/cpu.h))
-ccflags-y += -DKC_CPU_NOTIFIER
-endif
-
-#
-# v3.14-rc8-130-gccad2365668f
-#
-# generic_file_buffered_write is removed, backport it
-#
-ifneq (,$(shell grep 'extern ssize_t generic_file_buffered_write' include/linux/fs.h))
-ccflags-y += -DKC_GENERIC_FILE_BUFFERED_WRITE=1
-endif
-
-#
-# v5.7-438-g8151b4c8bee4
-#
-# struct address_space_operations switches away from .readpages to .readahead
-#
-# RHEL has backported this feature all the way to RHEL8, as part of RHEL_KABI,
-# which means we need to detect this very precisely
-#
-ifneq (,$(shell grep 'readahead.*struct readahead_control' include/linux/fs.h))
-ccflags-y += -DKC_FILE_AOPS_READAHEAD
-endif
-
-#
-# v4.0-rc7-1743-g8436318205b9
-#
-# .aio_read and .aio_write no longer exist. All reads and writes now use the
-# .read_iter and .write_iter methods, or must implement .read and .write (which
-# we don't).
-#
-ifneq (,$(shell grep 'ssize_t.*aio_read' include/linux/fs.h))
-ccflags-y += -DKC_LINUX_HAVE_FOP_AIO_READ=1
-endif
-
-#
-# rhel7 has a custom inode_operations_wrapper struct that is discarded
-# entirely in favor of upstream structure since rhel8.
-#
-ifneq (,$(shell grep 'void.*follow_link.*struct dentry' include/linux/fs.h))
-ccflags-y += -DKC_LINUX_HAVE_RHEL_IOPS_WRAPPER=1
-endif
-
-ifneq (,$(shell grep 'size_t.*ki_left;' include/linux/aio.h))
-ccflags-y += -DKC_LINUX_AIO_KI_LEFT=1
-endif
-
-#
-# v4.4-rc4-4-g98e9cb5711c6
-#
-# Introduces a new xattr_handler .name member that can be used to match the
-# entire field, instead of just a prefix. For these kernels, we must use
-# the new .name field instead.
-ifneq (,$(shell grep 'static inline const char .xattr_prefix' include/linux/xattr.h))
-ccflags-y += -DKC_XATTR_HANDLER_NAME=1
-endif

kmod/src/acl.c

@@ -1,378 +0,0 @@
-/*
- * Copyright (C) 2022 Versity Software, Inc.  All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License v2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- */
-#include <linux/kernel.h>
-#include <linux/fs.h>
-#include <linux/slab.h>
-#include <linux/xattr.h>
-#include <linux/posix_acl.h>
-#include <linux/posix_acl_xattr.h>
-
-#include "format.h"
-#include "super.h"
-#include "scoutfs_trace.h"
-#include "xattr.h"
-#include "acl.h"
-#include "inode.h"
-#include "trans.h"
-
-/*
- * POSIX draft ACLs are stored as full xattr items with the entries
- * encoded as the kernel's posix_acl_xattr_{header,entry} value structs.
- *
- * They're accessed and modified via user facing synthetic xattrs, iops
- * calls from the kernel, during inode mode changes, and during inode
- * creation.
- *
- * ACL access devolves into xattr access which is relatively expensive
- * so we maintain the cached native form in the vfs inode.  We drop the
- * cache in lock invalidation which means that cached acl access must
- * always be performed under cluster locking.
- */
-
-static int acl_xattr_name_len(int type, char **name, size_t *name_len)
-{
-	int ret = 0;
-
-	switch (type) {
-	case ACL_TYPE_ACCESS:
-		*name = XATTR_NAME_POSIX_ACL_ACCESS;
-		if (name_len)
-			*name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1;
-		break;
-	case ACL_TYPE_DEFAULT:
-		*name = XATTR_NAME_POSIX_ACL_DEFAULT;
-		if (name_len)
-			*name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1;
-		break;
-	default:
-		ret = -EINVAL;
-		break;
-	}
-
-	return ret;
-}
-
-struct posix_acl *scoutfs_get_acl_locked(struct inode *inode, int type, struct scoutfs_lock *lock)
-{
-	struct posix_acl *acl;
-	char *value = NULL;
-	char *name;
-	int ret;
-
-#ifndef KC___POSIX_ACL_CREATE
-	if (!IS_POSIXACL(inode))
-		return NULL;
-
-	acl = get_cached_acl(inode, type);
-	if (acl != ACL_NOT_CACHED)
-		return acl;
-#endif
-
-	ret = acl_xattr_name_len(type, &name, NULL);
-	if (ret < 0)
-		return ERR_PTR(ret);
-
-	ret = scoutfs_xattr_get_locked(inode, name, NULL, 0, lock);
-	if (ret > 0) {
-		value = kzalloc(ret, GFP_NOFS);
-		if (!value)
-			ret = -ENOMEM;
-		else
-			ret = scoutfs_xattr_get_locked(inode, name, value, ret, lock);
-	}
-	if (ret > 0) {
-		acl = posix_acl_from_xattr(&init_user_ns, value, ret);
-	} else if (ret == -ENODATA || ret == 0) {
-		acl = NULL;
-	} else {
-		acl = ERR_PTR(ret);
-	}
-
-#ifndef KC___POSIX_ACL_CREATE
-	/* can set null negative cache */
-	if (!IS_ERR(acl))
-		set_cached_acl(inode, type, acl);
-#endif
-
-	kfree(value);
-
-	return acl;
-}
-
-struct posix_acl *scoutfs_get_acl(struct inode *inode, int type)
-{
-	struct super_block *sb = inode->i_sb;
-	struct scoutfs_lock *lock = NULL;
-	struct posix_acl *acl;
-	int ret;
-
-#ifndef KC___POSIX_ACL_CREATE
-	if (!IS_POSIXACL(inode))
-		return NULL;
-#endif
-
-	ret = scoutfs_lock_inode(sb, SCOUTFS_LOCK_READ, 0, inode, &lock);
-	if (ret < 0) {
-		acl = ERR_PTR(ret);
-	} else {
-		acl = scoutfs_get_acl_locked(inode, type, lock);
-		scoutfs_unlock(sb, lock, SCOUTFS_LOCK_READ);
-	}
-
-	return acl;
-}
-
-/*
- * The caller has acquired the locks and dirtied the inode, they'll
- * update the inode item if we return 0.
- */
-int scoutfs_set_acl_locked(struct inode *inode, struct posix_acl *acl, int type,
-			   struct scoutfs_lock *lock, struct list_head *ind_locks)
-{
-	static const struct scoutfs_xattr_prefix_tags tgs = {0,}; /* never scoutfs. prefix */
-	bool set_mode = false;
-	char *value = NULL;
-	umode_t new_mode;
-	size_t name_len;
-	char *name;
-	int size = 0;
-	int ret;
-
-	ret = acl_xattr_name_len(type, &name, &name_len);
-	if (ret < 0)
-		return ret;
-
-	switch (type) {
-	case ACL_TYPE_ACCESS:
-		if (acl) {
-			ret = posix_acl_update_mode(inode, &new_mode, &acl);
-			if (ret < 0)
-				goto out;
-			set_mode = true;
-		}
-		break;
-	case ACL_TYPE_DEFAULT:
-		if (!S_ISDIR(inode->i_mode)) {
-			ret = acl ? -EINVAL : 0;
-			goto out;
-		}
-		break;
-	}
-
-	if (acl) {
-		size = posix_acl_xattr_size(acl->a_count);
-		value = kmalloc(size, GFP_NOFS);
-		if (!value) {
-			ret = -ENOMEM;
-			goto out;
-		}
-
-		ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
-		if (ret < 0)
-			goto out;
-	}
-
-	ret = scoutfs_xattr_set_locked(inode, name, name_len, value, size, 0, &tgs,
-				       lock, NULL, ind_locks);
-	if (ret == 0 && set_mode) {
-		inode->i_mode = new_mode;
-		if (!value) {
-			/* can be setting an acl that only affects mode, didn't need xattr */
-			inode_inc_iversion(inode);
-			inode->i_ctime = current_time(inode);
-		}
-	}
-
-out:
-#ifndef KC___POSIX_ACL_CREATE
-	if (!ret)
-		set_cached_acl(inode, type, acl);
-#endif
-
-	kfree(value);
-
-	return ret;
-}
-
-int scoutfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
-{
-	struct super_block *sb = inode->i_sb;
-	struct scoutfs_lock *lock = NULL;
-	LIST_HEAD(ind_locks);
-	int ret;
-
-	ret = scoutfs_lock_inode(sb, SCOUTFS_LOCK_WRITE, SCOUTFS_LKF_REFRESH_INODE, inode, &lock) ?:
-	      scoutfs_inode_index_lock_hold(inode, &ind_locks, false, true);
-	if (ret == 0) {
-		ret = scoutfs_dirty_inode_item(inode, lock) ?:
-		      scoutfs_set_acl_locked(inode, acl, type, lock, &ind_locks);
-		if (ret == 0)
-			scoutfs_update_inode_item(inode, lock, &ind_locks);
-
-		scoutfs_release_trans(sb);
-		scoutfs_inode_index_unlock(sb, &ind_locks);
-	}
-
-	scoutfs_unlock(sb, lock, SCOUTFS_LOCK_WRITE);
-	return ret;
-}
-#ifdef KC_XATTR_STRUCT_XATTR_HANDLER
-int scoutfs_acl_get_xattr(const struct xattr_handler *handler, struct dentry *dentry,
-			  struct inode *inode, const char *name, void *value,
-			  size_t size)
-{
-	int type = handler->flags;
-#else
-int scoutfs_acl_get_xattr(struct dentry *dentry, const char *name, void *value, size_t size,
-			  int type)
-{
-#endif
-	struct posix_acl *acl;
-	int ret = 0;
-
-	if (!IS_POSIXACL(dentry->d_inode))
-		return -EOPNOTSUPP;
-
-	acl = scoutfs_get_acl(dentry->d_inode, type);
-	if (IS_ERR(acl))
-		return PTR_ERR(acl);
-	if (acl == NULL)
-		return -ENODATA;
-
-	ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
-	posix_acl_release(acl);
-
-	return ret;
-}
-
-#ifdef KC_XATTR_STRUCT_XATTR_HANDLER
-int scoutfs_acl_set_xattr(const struct xattr_handler *handler, struct dentry *dentry,
-			  struct inode *inode, const char *name, const void *value,
-			  size_t size, int flags)
-{
-	int type = handler->flags;
-#else
-int scoutfs_acl_set_xattr(struct dentry *dentry, const char *name, const void *value, size_t size,
-			  int flags, int type)
-{
-#endif
-	struct posix_acl *acl = NULL;
-	int ret;
-
-	if (!inode_owner_or_capable(dentry->d_inode))
-		return -EPERM;
-
-	if (!IS_POSIXACL(dentry->d_inode))
-		return -EOPNOTSUPP;
-
-	if (value) {
-		acl = posix_acl_from_xattr(&init_user_ns, value, size);
-		if (IS_ERR(acl))
-			return PTR_ERR(acl);
-
-		if (acl) {
-			ret = kc_posix_acl_valid(&init_user_ns, acl);
-			if (ret)
-				goto out;
-		}
-	}
-
-	ret = scoutfs_set_acl(dentry->d_inode, acl, type);
-out:
-	posix_acl_release(acl);
-
-	return ret;
-}
-
-/*
- * Apply the parent's default acl to new inodes access acl and inherit
- * it as the default for new directories.  The caller holds locks and a
- * transaction.
- */
-int scoutfs_init_acl_locked(struct inode *inode, struct inode *dir,
-			    struct scoutfs_lock *lock, struct scoutfs_lock *dir_lock,
-			    struct list_head *ind_locks)
-{
-	struct posix_acl *acl = NULL;
-	int ret = 0;
-
-	if (!S_ISLNK(inode->i_mode)) {
-		if (IS_POSIXACL(dir)) {
-			acl = scoutfs_get_acl_locked(dir, ACL_TYPE_DEFAULT, dir_lock);
-			if (IS_ERR(acl))
-				return PTR_ERR(acl);
-		}
-
-		if (!acl)
-			inode->i_mode &= ~current_umask();
-	}
-
-	if (IS_POSIXACL(dir) && acl) {
-		if (S_ISDIR(inode->i_mode)) {
-			ret = scoutfs_set_acl_locked(inode, acl, ACL_TYPE_DEFAULT,
-						     lock, ind_locks);
-			if (ret)
-				goto out;
-		}
-		ret = __posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
-		if (ret < 0)
-			return ret;
-		if (ret > 0)
-			ret = scoutfs_set_acl_locked(inode, acl, ACL_TYPE_ACCESS,
-						     lock, ind_locks);
-	} else {
-		cache_no_acl(inode);
-	}
-out:
-	posix_acl_release(acl);
-	return ret;
-}
-
-/*
- * Update the access ACL based on a newly set mode.  If we return an
- * error then the xattr wasn't changed.
- *
- * Annoyingly, setattr_copy has logic that transforms the final set mode
- * that we want to use to update the acl.   But we don't want to modify
- * the other inode fields while discovering the resulting mode.  We're
- * relying on acl_chmod not caring about the transformation (currently
- * just clears sgid).  It would be better if we could get the resulting
- * mode to give to acl_chmod without modifying the other inode fields.
- *
- * The caller has the inode mutex, a cluster lock, transaction, and will
- * update the inode item if we return success.
- */
-int scoutfs_acl_chmod_locked(struct inode *inode, struct iattr *attr,
-			     struct scoutfs_lock *lock, struct list_head *ind_locks)
-{
-	struct posix_acl *acl;
-	int ret = 0;
-
-	if (!IS_POSIXACL(inode) || !(attr->ia_valid & ATTR_MODE))
-		return 0;
-
-	if (S_ISLNK(inode->i_mode))
-		return -EOPNOTSUPP;
-
-	acl = scoutfs_get_acl_locked(inode, ACL_TYPE_ACCESS, lock);
-	if (IS_ERR_OR_NULL(acl))
-		return PTR_ERR(acl);
-
-	ret = __posix_acl_chmod(&acl, GFP_KERNEL, attr->ia_mode);
-	if (ret)
-		return ret;
-
-	ret = scoutfs_set_acl_locked(inode, acl, ACL_TYPE_ACCESS, lock, ind_locks);
-	posix_acl_release(acl);
-	return ret;
-}

kmod/src/acl.h

@@ -1,27 +0,0 @@
-#ifndef _SCOUTFS_ACL_H_
-#define _SCOUTFS_ACL_H_
-
-struct posix_acl *scoutfs_get_acl(struct inode *inode, int type);
-struct posix_acl *scoutfs_get_acl_locked(struct inode *inode, int type, struct scoutfs_lock *lock);
-int scoutfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
-int scoutfs_set_acl_locked(struct inode *inode, struct posix_acl *acl, int type,
-			   struct scoutfs_lock *lock, struct list_head *ind_locks);
-#ifdef KC_XATTR_STRUCT_XATTR_HANDLER
-int scoutfs_acl_get_xattr(const struct xattr_handler *, struct dentry *dentry,
-			  struct inode *inode, const char *name, void *value,
-			  size_t size);
-int scoutfs_acl_set_xattr(const struct xattr_handler *, struct dentry *dentry,
-			  struct inode *inode, const char *name, const void *value,
-			  size_t size, int flags);
-#else
-int scoutfs_acl_get_xattr(struct dentry *dentry, const char *name, void *value, size_t size,
-			  int type);
-int scoutfs_acl_set_xattr(struct dentry *dentry, const char *name, const void *value, size_t size,
-			  int flags, int type);
-#endif
-int scoutfs_acl_chmod_locked(struct inode *inode, struct iattr *attr,
-			     struct scoutfs_lock *lock, struct list_head *ind_locks);
-int scoutfs_init_acl_locked(struct inode *inode, struct inode *dir,
-			    struct scoutfs_lock *lock, struct scoutfs_lock *dir_lock,
-			    struct list_head *ind_locks);
-#endif

kmod/src/alloc.c

@@ -29,8 +29,8 @@
  * The core allocator uses extent items in btrees rooted in the super.
  * Each free extent is stored in two items.  The first item is indexed
  * by block location and is used to merge adjacent extents when freeing.
- * The second item is indexed by the order of the length and is used to
- * find large extents to allocate from.
+ * The second item is indexed by length and is used to find large
+ * extents to allocate from.
  *
  * Free extent always consumes the front of the largest extent.  This
  * attempts to discourage fragmentation by given smaller freed extents
@@ -66,68 +66,26 @@
  * blocks to modify the next blocks, and swaps them at each transaction.
  */
 
-/*
- * Return the order of the length of a free extent, which we define as
- * floor(log_8_(len)): 0..7 = 0, 8..63 = 1, etc.
- */
-static u64 free_extent_order(u64 len)
-{
-	return (fls64(len | 1) - 1) / 3;
-}
-
-/*
- * The smallest (non-zero) length that will be mapped to the same order
- * as the given length.
- */
-static u64 smallest_order_length(u64 len)
-{
-	return 1ULL << (free_extent_order(len) * 3);
-}
-
-/*
- * An extent modification dirties three distinct leaves of an allocator
- * btree as it adds and removes the blkno and size sorted items for the
- * old and new lengths of the extent.  Dirtying the paths to these
- * leaves can grow the tree and grow/shrink neighbours at each level.
- * We over-estimate the number of blocks allocated and freed (the paths
- * share a root, growth doesn't free) to err on the simpler and safer
- * side.  The overhead is minimal given the relatively large list blocks
- * and relatively short allocator trees.
- */
-static u32 extent_mod_blocks(u32 height)
-{
-	return ((1 + height) * 2) * 3;
-}
-
 /*
  * Free extents don't have flags and are stored in two indexes sorted by
- * block location and by length order, largest first.  The location key
- * field is set to the final block in the extent so that we can find
- * intersections by calling _next() with the start of the range we're
- * searching for.
- *
- * We never store 0 length extents but we do build keys for searching
- * the order index from 0,0 without having to map it to a real extent.
+ * block location and by length, largest first.  The block location key
+ * is set to the final block in the extent so that we can find
+ * intersections by calling _next() iterators starting with the block
+ * we're searching for.
  */
-static void init_ext_key(struct scoutfs_key *key, int zone, u64 start, u64 len)
+static void init_ext_key(struct scoutfs_key *key, int type, u64 start, u64 len)
 {
 	*key = (struct scoutfs_key) {
-		.sk_zone = zone,
+		.sk_zone = SCOUTFS_FREE_EXTENT_ZONE,
+		.sk_type = type,
 	};
 
-	if (len == 0) {
-		/* we only use 0 len extents for magic 0,0 order lookups */
-		WARN_ON_ONCE(zone != SCOUTFS_FREE_EXTENT_ORDER_ZONE || start != 0);
-		return;
-	}
-
-	if (zone == SCOUTFS_FREE_EXTENT_BLKNO_ZONE) {
+	if (type == SCOUTFS_FREE_EXTENT_BLKNO_TYPE) {
 		key->skfb_end = cpu_to_le64(start + len - 1);
 		key->skfb_len = cpu_to_le64(len);
-	} else if (zone == SCOUTFS_FREE_EXTENT_ORDER_ZONE) {
-		key->skfo_revord = cpu_to_le64(U64_MAX - free_extent_order(len));
-		key->skfo_end = cpu_to_le64(start + len - 1);
-		key->skfo_len = cpu_to_le64(len);
+	} else if (type == SCOUTFS_FREE_EXTENT_LEN_TYPE) {
+		key->skfl_neglen = cpu_to_le64(-len);
+		key->skfl_blkno = cpu_to_le64(start);
 	} else {
 		BUG();
 	}
@@ -135,27 +93,23 @@ static void init_ext_key(struct scoutfs_key *key, int zone, u64 start, u64 len)
 
 static void ext_from_key(struct scoutfs_extent *ext, struct scoutfs_key *key)
 {
-	if (key->sk_zone == SCOUTFS_FREE_EXTENT_BLKNO_ZONE) {
+	if (key->sk_type == SCOUTFS_FREE_EXTENT_BLKNO_TYPE) {
 		ext->start = le64_to_cpu(key->skfb_end) -
 			     le64_to_cpu(key->skfb_len) + 1;
 		ext->len = le64_to_cpu(key->skfb_len);
 	} else {
-		ext->start = le64_to_cpu(key->skfo_end) -
-			     le64_to_cpu(key->skfo_len) + 1;
-		ext->len = le64_to_cpu(key->skfo_len);
+		ext->start = le64_to_cpu(key->skfl_blkno);
+		ext->len = -le64_to_cpu(key->skfl_neglen);
 	}
 	ext->map = 0;
 	ext->flags = 0;
-
-	/* we never store 0 length extents */
-	WARN_ON_ONCE(ext->len == 0);
 }
 
 struct alloc_ext_args {
 	struct scoutfs_alloc *alloc;
 	struct scoutfs_block_writer *wri;
 	struct scoutfs_alloc_root *root;
-	int zone;
+	int type;
 };
 
 static int alloc_ext_next(struct super_block *sb, void *arg,
@@ -166,13 +120,13 @@ static int alloc_ext_next(struct super_block *sb, void *arg,
 	struct scoutfs_key key;
 	int ret;
 
-	init_ext_key(&key, args->zone, start, len);
+	init_ext_key(&key, args->type, start, len);
 
 	ret = scoutfs_btree_next(sb, &args->root->root, &key, &iref);
 	if (ret == 0) {
 		if (iref.val_len != 0)
 			ret = -EIO;
-		else if (iref.key->sk_zone != args->zone)
+		else if (iref.key->sk_type != args->type)
 			ret = -ENOENT;
 		else
 			ext_from_key(ext, iref.key);
@@ -185,19 +139,19 @@ static int alloc_ext_next(struct super_block *sb, void *arg,
 	return ret;
 }
 
-static int other_zone(int zone)
+static int other_type(int type)
 {
-	if (zone == SCOUTFS_FREE_EXTENT_BLKNO_ZONE)
-		return SCOUTFS_FREE_EXTENT_ORDER_ZONE;
-	else if (zone == SCOUTFS_FREE_EXTENT_ORDER_ZONE)
-		return SCOUTFS_FREE_EXTENT_BLKNO_ZONE;
+	if (type == SCOUTFS_FREE_EXTENT_BLKNO_TYPE)
+		return SCOUTFS_FREE_EXTENT_LEN_TYPE;
+	else if (type == SCOUTFS_FREE_EXTENT_LEN_TYPE)
+		return SCOUTFS_FREE_EXTENT_BLKNO_TYPE;
 	else
 		BUG();
 }
 
 /*
  * Insert an extent along with its matching item which is indexed by
- * opposite of its order or blkno.  If we succeed we update the root's
+ * opposite of its len or blkno.  If we succeed we update the root's
  * record of the total length of all the stored extents.
  */
 static int alloc_ext_insert(struct super_block *sb, void *arg,
@@ -213,8 +167,8 @@ static int alloc_ext_insert(struct super_block *sb, void *arg,
 	if (WARN_ON_ONCE(map || flags))
 		return -EINVAL;
 
-	init_ext_key(&key, args->zone, start, len);
-	init_ext_key(&other, other_zone(args->zone), start, len);
+	init_ext_key(&key, args->type, start, len);
+	init_ext_key(&other, other_type(args->type), start, len);
 
 	ret = scoutfs_btree_insert(sb, args->alloc, args->wri,
 				   &args->root->root, &key, NULL, 0);
@@ -242,8 +196,8 @@ static int alloc_ext_remove(struct super_block *sb, void *arg,
 	int ret;
 	int err;
 
-	init_ext_key(&key, args->zone, start, len);
-	init_ext_key(&other, other_zone(args->zone), start, len);
+	init_ext_key(&key, args->type, start, len);
+	init_ext_key(&other, other_type(args->type), start, len);
 
 	ret = scoutfs_btree_delete(sb, args->alloc, args->wri,
 				   &args->root->root, &key);
@@ -267,7 +221,6 @@ static struct scoutfs_ext_ops alloc_ext_ops = {
 	.next = alloc_ext_next,
 	.insert = alloc_ext_insert,
 	.remove = alloc_ext_remove,
-	.insert_overlap_warn = true,
 };
 
 static bool invalid_extent(u64 start, u64 end, u64 first, u64 last)
@@ -277,17 +230,20 @@ static bool invalid_extent(u64 start, u64 end, u64 first, u64 last)
 
 static bool invalid_meta_blkno(struct super_block *sb, u64 blkno)
 {
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-	u64 last_meta = (i_size_read(sbi->meta_bdev->bd_inode) >> SCOUTFS_BLOCK_LG_SHIFT) - 1;
+	struct scoutfs_super_block *super = &SCOUTFS_SB(sb)->super;
 
-	return invalid_extent(blkno, blkno, SCOUTFS_META_DEV_START_BLKNO, last_meta);
+	return invalid_extent(blkno, blkno,
+			      le64_to_cpu(super->first_meta_blkno),
+			      le64_to_cpu(super->last_meta_blkno));
 }
 
 static bool invalid_data_extent(struct super_block *sb, u64 start, u64 len)
 {
-	u64 last_data = (i_size_read(sb->s_bdev->bd_inode) >> SCOUTFS_BLOCK_SM_SHIFT) - 1;
+	struct scoutfs_super_block *super = &SCOUTFS_SB(sb)->super;
 
-	return invalid_extent(start, start + len - 1, SCOUTFS_DATA_DEV_START_BLKNO, last_data);
+	return invalid_extent(start, start + len - 1,
+			      le64_to_cpu(super->first_data_blkno),
+			      le64_to_cpu(super->last_data_blkno));
 }
 
 void scoutfs_alloc_init(struct scoutfs_alloc *alloc,
@@ -663,7 +619,7 @@ int scoutfs_dalloc_return_cached(struct super_block *sb,
 		.alloc = alloc,
 		.wri = wri,
 		.root = &dalloc->root,
-		.zone = SCOUTFS_FREE_EXTENT_BLKNO_ZONE,
+		.type = SCOUTFS_FREE_EXTENT_BLKNO_TYPE,
 	};
 	int ret = 0;
 
@@ -689,14 +645,6 @@ int scoutfs_dalloc_return_cached(struct super_block *sb,
  *
  * Unlike meta allocations, the caller is expected to serialize
  * allocations from the root.
- *
- * ENOBUFS is returned if the data allocator ran out of space and we can
- * probably refill it from the server.  The caller is expected to back
- * out, commit the transaction, and try again.
- *
- * ENOSPC is returned if the data allocator ran out of space but we have
- * a flag from the server telling us that there's no more space
- * available.  This is a hard error and should be returned.
  */
 int scoutfs_alloc_data(struct super_block *sb, struct scoutfs_alloc *alloc,
 		       struct scoutfs_block_writer *wri,
@@ -707,7 +655,7 @@ int scoutfs_alloc_data(struct super_block *sb, struct scoutfs_alloc *alloc,
 		.alloc = alloc,
 		.wri = wri,
 		.root = &dalloc->root,
-		.zone = SCOUTFS_FREE_EXTENT_ORDER_ZONE,
+		.type = SCOUTFS_FREE_EXTENT_LEN_TYPE,
 	};
 	struct scoutfs_extent ext;
 	u64 len;
@@ -745,13 +693,13 @@ int scoutfs_alloc_data(struct super_block *sb, struct scoutfs_alloc *alloc,
 	ret = 0;
 out:
 	if (ret < 0) {
-		if (ret == -ENOENT) {
-			if (le32_to_cpu(dalloc->root.flags) & SCOUTFS_ALLOC_FLAG_LOW)
-				ret = -ENOSPC;
-			else
-				ret = -ENOBUFS;
-		}
-
+		/*
+		 * Special retval meaning there wasn't space to alloc from
+		 * this txn. Doesn't mean filesystem is completely full.
+		 * Maybe upper layers want to try again.
+		 */
+		if (ret == -ENOENT)
+			ret = -ENOBUFS;
 		*blkno_ret = 0;
 		*count_ret = 0;
 	} else {
@@ -780,7 +728,7 @@ int scoutfs_free_data(struct super_block *sb, struct scoutfs_alloc *alloc,
 		.alloc = alloc,
 		.wri = wri,
 		.root = root,
-		.zone = SCOUTFS_FREE_EXTENT_BLKNO_ZONE,
+		.type = SCOUTFS_FREE_EXTENT_BLKNO_TYPE,
 	};
 	int ret;
 
@@ -793,95 +741,6 @@ int scoutfs_free_data(struct super_block *sb, struct scoutfs_alloc *alloc,
 	return ret;
 }
 
-/*
- * Return the first zone bit that the extent intersects with.
- */
-static int first_extent_zone(struct scoutfs_extent *ext,  __le64 *zones, u64 zone_blocks)
-{
-	int first;
-	int last;
-	int nr;
-
-	first = div64_u64(ext->start, zone_blocks);
-	last = div64_u64(ext->start + ext->len - 1, zone_blocks);
-
-	nr = find_next_bit_le(zones, SCOUTFS_DATA_ALLOC_MAX_ZONES, first);
-	if (nr <= last)
-		return nr;
-
-	return SCOUTFS_DATA_ALLOC_MAX_ZONES;
-}
-
-/*
- * Find an extent in specific zones to satisfy an allocation.  We use
- * the order items to search for the largest extent that intersects with
- * the zones whose bits are set in the caller's bitmap.
- */
-static int find_zone_extent(struct super_block *sb, struct scoutfs_alloc_root *root,
-			    __le64 *zones, u64 zone_blocks,
-			    struct scoutfs_extent *found_ret, u64 count,
-			    struct scoutfs_extent *ext_ret)
-{
-	struct alloc_ext_args args = {
-		.root = root,
-		.zone = SCOUTFS_FREE_EXTENT_ORDER_ZONE,
-	};
-	struct scoutfs_extent found;
-	struct scoutfs_extent ext;
-	u64 start;
-	u64 len;
-	int nr;
-	int ret;
-
-	/* don't bother when there are no bits set */
-	if (find_next_bit_le(zones, SCOUTFS_DATA_ALLOC_MAX_ZONES, 0) ==
-	    SCOUTFS_DATA_ALLOC_MAX_ZONES)
-		return -ENOENT;
-
-	/* start searching for largest extent from the first zone */
-	len = smallest_order_length(SCOUTFS_BLOCK_SM_MAX);
-	nr = 0;
-
-	for (;;) {
-		/* search for extents in the next zone at our order */
-		nr = find_next_bit_le(zones, SCOUTFS_DATA_ALLOC_MAX_ZONES, nr);
-		if (nr >= SCOUTFS_DATA_ALLOC_MAX_ZONES) {
-			/* wrap down to next smaller order if we run out of bits */
-			len >>= 3;
-			if (len == 0) {
-				ret = -ENOENT;
-				break;
-			}
-			nr = find_next_bit_le(zones, SCOUTFS_DATA_ALLOC_MAX_ZONES, 0);
-		}
-
-		start = (u64)nr * zone_blocks;
-
-		ret = scoutfs_ext_next(sb, &alloc_ext_ops, &args, start, len, &found);
-		if (ret < 0)
-			break;
-
-		/* see if the next extent intersects any zones */
-		nr = first_extent_zone(&found, zones, zone_blocks);
-		if (nr < SCOUTFS_DATA_ALLOC_MAX_ZONES) {
-			start = (u64)nr * zone_blocks;
-
-			ext.start = max(start, found.start);
-			ext.len = min(count, found.start + found.len - ext.start);
-
-			*found_ret = found;
-			*ext_ret = ext;
-			ret = 0;
-			break;
-		}
-
-		/* continue searching past extent */
-		nr = div64_u64(found.start + found.len - 1, zone_blocks) + 1;
-		len = smallest_order_length(found.len);
-	}
-
-	return ret;
-}
 
 /*
  * Move extent items adding up to the requested total length from the
@@ -892,18 +751,6 @@ static int find_zone_extent(struct super_block *sb, struct scoutfs_alloc_root *r
  * -ENOENT is returned if we run out of extents in the source tree
  * before moving the total.
  *
- * If meta_budget is non-zero then -EINPROGRESS can be returned if the
- * the caller's budget is consumed in the allocator during this call
- * (though not necessarily by us, we don't have per-thread tracking of
- * allocator consumption :/).  The call can still have made progress and
- * caller is expected commit the dirty trees and examining the resulting
- * modified trees to see if they need to continue moving extents.
- *
- * The caller can specify that extents in the source tree should first
- * be found based on their zone bitmaps.  We'll first try to find
- * extents in the exclusive zones, then vacant zones, and then we'll
- * fall back to normal allocation that ignores zones.
- *
  * This first pass is not optimal because it performs full btree walks
  * per extent.  We could optimize this with more clever btree item
  * manipulation functions which can iterate through src and dst blocks
@@ -912,100 +759,32 @@ static int find_zone_extent(struct super_block *sb, struct scoutfs_alloc_root *r
 int scoutfs_alloc_move(struct super_block *sb, struct scoutfs_alloc *alloc,
 		       struct scoutfs_block_writer *wri,
 		       struct scoutfs_alloc_root *dst,
-		       struct scoutfs_alloc_root *src, u64 total,
-		       __le64 *exclusive, __le64 *vacant, u64 zone_blocks, u64 meta_budget)
+		       struct scoutfs_alloc_root *src, u64 total)
 {
 	struct alloc_ext_args args = {
 		.alloc = alloc,
 		.wri = wri,
 	};
-	struct scoutfs_extent found;
 	struct scoutfs_extent ext;
-	u32 avail_start = 0;
-	u32 freed_start = 0;
 	u64 moved = 0;
-	u64 count;
 	int ret = 0;
 	int err;
 
-	if (zone_blocks == 0) {
-		exclusive = NULL;
-		vacant = NULL;
-	}
-
-	if (meta_budget != 0)
-		scoutfs_alloc_meta_remaining(alloc, &avail_start, &freed_start);
-
 	while (moved < total) {
-		count = total - moved;
-
-		if (exclusive) {
-			/* first try to find extents in our exclusive zones */
-			ret = find_zone_extent(sb, src, exclusive, zone_blocks,
-					       &found, count, &ext);
-			if (ret == -ENOENT) {
-				exclusive = NULL;
-				continue;
-			}
-		} else if (vacant) {
-			/* then try to find extents in vacant zones */
-			ret = find_zone_extent(sb, src, vacant, zone_blocks,
-					       &found, count, &ext);
-			if (ret == -ENOENT) {
-				vacant = NULL;
-				continue;
-			}
-		} else {
-			/* otherwise fall back to finding extents anywhere */
-			args.root = src;
-			args.zone = SCOUTFS_FREE_EXTENT_ORDER_ZONE;
-			ret = scoutfs_ext_next(sb, &alloc_ext_ops, &args, 0, 0, &found);
-			if (ret == 0) {
-				ext.start = found.start;
-				ext.len = min(count, found.len);
-			}
-		}
-		if (ret < 0)
-			break;
-
-		if (meta_budget != 0 &&
-		    scoutfs_alloc_meta_low_since(alloc, avail_start, freed_start, meta_budget,
-						 extent_mod_blocks(src->root.height) +
-						 extent_mod_blocks(dst->root.height))) {
-			ret = -EINPROGRESS;
-			break;
-		}
-
-		/* return partial if the server alloc can't dirty any more */
-		if (scoutfs_alloc_meta_low(sb, alloc, 50 + extent_mod_blocks(src->root.height) +
-						      extent_mod_blocks(dst->root.height))) {
-			if (WARN_ON_ONCE(!moved))
-				ret = -ENOSPC;
-			else
-				ret = 0;
-			break;
-		}
-
-		/* searching set start/len, finish initializing alloced extent */
-		ext.map = found.map ? ext.start - found.start + found.map : 0;
-		ext.flags = found.flags;
-
-		/* remove the allocation from the found extent */
 		args.root = src;
-		args.zone = SCOUTFS_FREE_EXTENT_BLKNO_ZONE;
-		ret = scoutfs_ext_remove(sb, &alloc_ext_ops, &args, ext.start, ext.len);
+		args.type = SCOUTFS_FREE_EXTENT_LEN_TYPE;
+		ret = scoutfs_ext_alloc(sb, &alloc_ext_ops, &args,
+					0, 0, total - moved, &ext);
 		if (ret < 0)
 			break;
 
-		/* insert the allocated extent into the dest */
 		args.root = dst;
-		args.zone = SCOUTFS_FREE_EXTENT_BLKNO_ZONE;
+		args.type = SCOUTFS_FREE_EXTENT_BLKNO_TYPE;
 		ret = scoutfs_ext_insert(sb, &alloc_ext_ops, &args, ext.start,
 					 ext.len, ext.map, ext.flags);
 		if (ret < 0) {
-			/* and put it back in src if insertion failed */
 			args.root = src;
-			args.zone = SCOUTFS_FREE_EXTENT_BLKNO_ZONE;
+			args.type = SCOUTFS_FREE_EXTENT_BLKNO_TYPE;
 			err = scoutfs_ext_insert(sb, &alloc_ext_ops, &args,
 						 ext.start, ext.len, ext.map,
 						 ext.flags);
@@ -1015,8 +794,6 @@ int scoutfs_alloc_move(struct super_block *sb, struct scoutfs_alloc *alloc,
 
 		moved += ext.len;
 		scoutfs_inc_counter(sb, alloc_moved_extent);
-
-		trace_scoutfs_alloc_move_extent(sb, &ext);
 	}
 
 	scoutfs_inc_counter(sb, alloc_move);
@@ -1025,39 +802,6 @@ int scoutfs_alloc_move(struct super_block *sb, struct scoutfs_alloc *alloc,
 	return ret;
 }
 
-/*
- * Add new free space to an allocator.  _ext_insert will make sure that it doesn't
- * overlap with any existing extents.  This is done by the server in a transaction that
- * also updates total_*_blocks in the super so we don't verify.
- */
-int scoutfs_alloc_insert(struct super_block *sb, struct scoutfs_alloc *alloc,
-			 struct scoutfs_block_writer *wri, struct scoutfs_alloc_root *root,
-			 u64 start, u64 len)
-{
-	struct alloc_ext_args args = {
-		.alloc = alloc,
-		.wri = wri,
-		.root = root,
-		.zone = SCOUTFS_FREE_EXTENT_BLKNO_ZONE,
-	};
-
-	return scoutfs_ext_insert(sb, &alloc_ext_ops, &args, start, len, 0, 0);
-}
-
-int scoutfs_alloc_remove(struct super_block *sb, struct scoutfs_alloc *alloc,
-			 struct scoutfs_block_writer *wri, struct scoutfs_alloc_root *root,
-			 u64 start, u64 len)
-{
-	struct alloc_ext_args args = {
-		.alloc = alloc,
-		.wri = wri,
-		.root = root,
-		.zone = SCOUTFS_FREE_EXTENT_BLKNO_ZONE,
-	};
-
-	return scoutfs_ext_remove(sb, &alloc_ext_ops, &args, start, len);
-}
-
 /*
  * We only trim one block, instead of looping trimming all, because the
  * caller is assuming that we do a fixed amount of work when they check
@@ -1104,22 +848,18 @@ out:
 }
 
 /*
- * True if the allocator has enough blocks in the avail list and space
- * in the freed list to be able to perform the callers operations.  If
- * false the caller should back off and return partial progress rather
- * than completely exhausting the avail list or overflowing the freed
- * list.
+ * True if the allocator has enough free blocks to cow (alloc and free)
+ * a list block and all the btree blocks that store extent items.
  *
- * The caller tells us how many extents they're about to modify and how
- * many other additional blocks they may cow manually.  And finally, the
- * caller could be the first to dirty the avail and freed blocks in the
- * allocator,
+ * At most, an extent operation can dirty down three paths of the tree
+ * to modify a blkno item and two distant len items.  We can grow and
+ * split the root, and then those three paths could share blocks but each
+ * modify two leaf blocks.
  */
-static bool list_has_blocks(struct super_block *sb, struct scoutfs_alloc *alloc,
-			    struct scoutfs_alloc_root *root, u32 extents, u32 addl_blocks)
+static bool list_can_cow(struct super_block *sb, struct scoutfs_alloc *alloc,
+			 struct scoutfs_alloc_root *root)
 {
-	u32 tree_blocks = extent_mod_blocks(root->root.height) * extents;
-	u32 most = 1 + tree_blocks + addl_blocks;
+	u32 most = 1 + (1 + 1 + (3 * (1 - root->root.height + 1)));
 
 	if (le32_to_cpu(alloc->avail.first_nr) < most) {
 		scoutfs_inc_counter(sb, alloc_list_avail_lo);
@@ -1161,7 +901,7 @@ int scoutfs_alloc_fill_list(struct super_block *sb,
 		.alloc = alloc,
 		.wri = wri,
 		.root = root,
-		.zone = SCOUTFS_FREE_EXTENT_ORDER_ZONE,
+		.type = SCOUTFS_FREE_EXTENT_LEN_TYPE,
 	};
 	struct scoutfs_alloc_list_block *lblk;
 	struct scoutfs_block *bl = NULL;
@@ -1183,7 +923,8 @@ int scoutfs_alloc_fill_list(struct super_block *sb,
 		goto out;
 	lblk = bl->data;
 
-	while (le32_to_cpu(lblk->nr) < target && list_has_blocks(sb, alloc, root, 1, 0)) {
+	while (le32_to_cpu(lblk->nr) < target &&
+	       list_can_cow(sb, alloc, root)) {
 
 		ret = scoutfs_ext_alloc(sb, &alloc_ext_ops, &args, 0, 0,
 					target - le32_to_cpu(lblk->nr), &ext);
@@ -1195,8 +936,6 @@ int scoutfs_alloc_fill_list(struct super_block *sb,
 
 		for (i = 0; i < ext.len; i++)
 			list_block_add(lhead, lblk, ext.start + i);
-
-		trace_scoutfs_alloc_fill_extent(sb, &ext);
 	}
 
 out:
@@ -1219,7 +958,7 @@ int scoutfs_alloc_empty_list(struct super_block *sb,
 		.alloc = alloc,
 		.wri = wri,
 		.root = root,
-		.zone = SCOUTFS_FREE_EXTENT_BLKNO_ZONE,
+		.type = SCOUTFS_FREE_EXTENT_BLKNO_TYPE,
 	};
 	struct scoutfs_alloc_list_block *lblk = NULL;
 	struct scoutfs_block *bl = NULL;
@@ -1229,7 +968,7 @@ int scoutfs_alloc_empty_list(struct super_block *sb,
 	if (WARN_ON_ONCE(lhead_in_alloc(alloc, lhead)))
 		return -EINVAL;
 
-	while (lhead->ref.blkno && list_has_blocks(sb, alloc, args.root, 1, 1)) {
+	while (lhead->ref.blkno && list_can_cow(sb, alloc, args.root)) {
 
 		if (lhead->first_nr == 0) {
 			ret = trim_empty_first_block(sb, alloc, wri, lhead);
@@ -1265,8 +1004,6 @@ int scoutfs_alloc_empty_list(struct super_block *sb,
 			break;
 
 		list_block_remove(lhead, lblk, ext.len);
-
-		trace_scoutfs_alloc_empty_extent(sb, &ext);
 	}
 
 	scoutfs_block_put(sb, bl);
@@ -1354,82 +1091,37 @@ bool scoutfs_alloc_meta_low(struct super_block *sb,
 	return lo;
 }
 
-void scoutfs_alloc_meta_remaining(struct scoutfs_alloc *alloc, u32 *avail_total, u32 *freed_space)
-{
-	unsigned int seq;
-
-	do {
-		seq = read_seqbegin(&alloc->seqlock);
-		*avail_total = le32_to_cpu(alloc->avail.first_nr);
-		*freed_space = list_block_space(alloc->freed.first_nr);
-	} while (read_seqretry(&alloc->seqlock, seq));
-}
-
 /*
- * Returns true if the caller's consumption of nr from either avail or
- * freed would end up exceeding their budget relative to the starting
- * remaining snapshot they took.
+ * Call the callers callback for every persistent allocator structure
+ * we can find.
  */
-bool scoutfs_alloc_meta_low_since(struct scoutfs_alloc *alloc, u32 avail_start, u32 freed_start,
-				  u32 budget, u32 nr)
-{
-	u32 avail_use;
-	u32 freed_use;
-	u32 avail;
-	u32 freed;
-
-	scoutfs_alloc_meta_remaining(alloc, &avail, &freed);
-
-	avail_use = avail_start - avail;
-	freed_use = freed_start - freed;
-
-	return ((avail_use + nr) > budget) || ((freed_use + nr) > budget);
-}
-
-bool scoutfs_alloc_test_flag(struct super_block *sb,
-			    struct scoutfs_alloc *alloc, u32 flag)
-{
-	unsigned int seq;
-	bool set;
-
-	do {
-		seq = read_seqbegin(&alloc->seqlock);
-		set = !!(le32_to_cpu(alloc->avail.flags) & flag);
-	} while (read_seqretry(&alloc->seqlock, seq));
-
-	return set;
-}
-
-/*
- * Iterate over the allocator structures referenced by the caller's
- * super and call the caller's callback with summaries of the blocks
- * found in each structure.
- *
- * The caller's responsible for the stability of the referenced blocks.
- * If the blocks could be stale the caller must deal with retrying when
- * it sees ESTALE.
- */
-int scoutfs_alloc_foreach_super(struct super_block *sb, struct scoutfs_super_block *super,
-				scoutfs_alloc_foreach_cb_t cb, void *arg)
+int scoutfs_alloc_foreach(struct super_block *sb,
+			  scoutfs_alloc_foreach_cb_t cb, void *arg)
 {
+	struct scoutfs_block_ref stale_refs[2] = {{0,}};
+	struct scoutfs_block_ref refs[2] = {{0,}};
+	struct scoutfs_super_block *super = NULL;
 	struct scoutfs_srch_compact *sc;
-	struct scoutfs_log_merge_request *lmreq;
-	struct scoutfs_log_merge_complete *lmcomp;
 	struct scoutfs_log_trees lt;
 	SCOUTFS_BTREE_ITEM_REF(iref);
 	struct scoutfs_key key;
-	int expected;
-	u64 avail_tot;
-	u64 freed_tot;
-	u64 id;
 	int ret;
 
+	super = kmalloc(sizeof(struct scoutfs_super_block), GFP_NOFS);
 	sc = kmalloc(sizeof(struct scoutfs_srch_compact), GFP_NOFS);
-	if (!sc) {
+	if (!super || !sc) {
 		ret = -ENOMEM;
 		goto out;
 	}
 
+retry:
+	ret = scoutfs_read_super(sb, super);
+	if (ret < 0)
+		goto out;
+
+	refs[0] = super->logs_root.ref;
+	refs[1] = super->srch_root.ref;
+
 	/* all the server allocators */
 	ret = cb(sb, arg, SCOUTFS_ALLOC_OWNER_SERVER, 0, true, true,
 		 le64_to_cpu(super->meta_alloc[0].total_len)) ?:
@@ -1519,152 +1211,19 @@ int scoutfs_alloc_foreach_super(struct super_block *sb, struct scoutfs_super_blo
 		scoutfs_key_inc(&key);
 	}
 
-	/* log merge allocators */
-	memset(&key, 0, sizeof(key));
-	key.sk_zone = SCOUTFS_LOG_MERGE_REQUEST_ZONE;
-	expected = sizeof(*lmreq);
-	id = 0;
-	avail_tot = 0;
-	freed_tot = 0;
-
-	for (;;) {
-		ret = scoutfs_btree_next(sb, &super->log_merge, &key, &iref);
-		if (ret == 0) {
-			if (iref.key->sk_zone != key.sk_zone) {
-				ret = -ENOENT;
-			} else if (iref.val_len == expected) {
-				key = *iref.key;
-				if (key.sk_zone == SCOUTFS_LOG_MERGE_REQUEST_ZONE) {
-					lmreq = iref.val;
-					id = le64_to_cpu(lmreq->rid);
-					avail_tot = le64_to_cpu(lmreq->meta_avail.total_nr);
-					freed_tot = le64_to_cpu(lmreq->meta_freed.total_nr);
-				} else {
-					lmcomp = iref.val;
-					id = le64_to_cpu(lmcomp->rid);
-					avail_tot = le64_to_cpu(lmcomp->meta_avail.total_nr);
-					freed_tot = le64_to_cpu(lmcomp->meta_freed.total_nr);
-				}
-			} else {
-				ret = -EIO;
-			}
-			scoutfs_btree_put_iref(&iref);
-		}
-		if (ret == -ENOENT) {
-			if (key.sk_zone == SCOUTFS_LOG_MERGE_REQUEST_ZONE) {
-				memset(&key, 0, sizeof(key));
-				key.sk_zone = SCOUTFS_LOG_MERGE_COMPLETE_ZONE;
-				expected = sizeof(*lmcomp);
-				continue;
-			}
-			break;
-		}
-		if (ret < 0)
-			goto out;
-
-		ret = cb(sb, arg, SCOUTFS_ALLOC_OWNER_LOG_MERGE, id, true, true, avail_tot) ?:
-		      cb(sb, arg, SCOUTFS_ALLOC_OWNER_LOG_MERGE, id, true, false, freed_tot);
-		if (ret < 0)
-			goto out;
-
-		scoutfs_key_inc(&key);
-	}
-
 	ret = 0;
 out:
+	if (ret == -ESTALE) {
+		if (memcmp(&stale_refs, &refs, sizeof(refs)) == 0) {
+			ret = -EIO;
+		} else {
+			BUILD_BUG_ON(sizeof(stale_refs) != sizeof(refs));
+			memcpy(stale_refs, refs, sizeof(stale_refs));
+			goto retry;
+		}
+	}
 
+	kfree(super);
 	kfree(sc);
 	return ret;
 }
-
-/*
- * Read the current on-disk super and use it to walk the allocators and
- * call the caller's callback.  This assumes that the super it's reading
- * could be stale and will retry if it encounters stale blocks.
- */
-int scoutfs_alloc_foreach(struct super_block *sb, scoutfs_alloc_foreach_cb_t cb, void *arg)
-{
-	struct scoutfs_super_block *super = NULL;
-	DECLARE_SAVED_REFS(saved);
-	int ret;
-
-	super = kmalloc(sizeof(struct scoutfs_super_block), GFP_NOFS);
-	if (!super) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	do {
-		ret = scoutfs_read_super(sb, super);
-		if (ret < 0)
-			goto out;
-
-		ret = scoutfs_alloc_foreach_super(sb, super, cb, arg);
-
-		ret = scoutfs_block_check_stale(sb, ret, &saved, &super->logs_root.ref,
-						&super->srch_root.ref);
-	} while (ret == -ESTALE);
-
-out:
-	kfree(super);
-	return ret;
-}
-
-struct foreach_cb_args {
-	scoutfs_alloc_extent_cb_t cb;
-	void *cb_arg;
-};
-
-static int alloc_btree_extent_item_cb(struct super_block *sb, struct scoutfs_key *key, u64 seq,
-				      u8 flags, void *val, int val_len, void *arg)
-{
-	struct foreach_cb_args *cba = arg;
-	struct scoutfs_extent ext;
-
-	if (key->sk_zone != SCOUTFS_FREE_EXTENT_BLKNO_ZONE)
-		return -ENOENT;
-
-	ext_from_key(&ext, key);
-	cba->cb(sb, cba->cb_arg, &ext);
-
-	return 0;
-}
-
-/*
- * Call the caller's callback on each extent stored in the allocator's
- * btree.  The callback sees extents called in order by starting blkno.
- */
-int scoutfs_alloc_extents_cb(struct super_block *sb, struct scoutfs_alloc_root *root,
-			     scoutfs_alloc_extent_cb_t cb, void *cb_arg)
-{
-	struct foreach_cb_args cba = {
-		.cb = cb,
-		.cb_arg = cb_arg,
-	};
-	struct scoutfs_key start;
-	struct scoutfs_key end;
-	struct scoutfs_key key;
-	int ret;
-
-	init_ext_key(&key, SCOUTFS_FREE_EXTENT_BLKNO_ZONE, 0, 1);
-
-	for (;;) {
-		/* will stop at order items before getting stuck in final block */
-		BUILD_BUG_ON(SCOUTFS_FREE_EXTENT_BLKNO_ZONE > SCOUTFS_FREE_EXTENT_ORDER_ZONE);
-		init_ext_key(&start, SCOUTFS_FREE_EXTENT_BLKNO_ZONE, 0, 1);
-		init_ext_key(&end, SCOUTFS_FREE_EXTENT_ORDER_ZONE, 0, 1);
-
-		ret = scoutfs_btree_read_items(sb, &root->root, &key, &start, &end,
-					       alloc_btree_extent_item_cb, &cba);
-		if (ret < 0 || end.sk_zone != SCOUTFS_FREE_EXTENT_BLKNO_ZONE) {
-			if (ret == -ENOENT)
-				ret = 0;
-			break;
-		}
-
-		key = end;
-		scoutfs_key_inc(&key);
-	}
-
-	return ret;
-}

kmod/src/alloc.h

@@ -19,11 +19,14 @@
 	(128ULL * 1024 * 1024 >> SCOUTFS_BLOCK_SM_SHIFT)
 
 /*
- * The default size that we'll try to preallocate.  This is trying to
- * hit the limit of large efficient device writes while minimizing
- * wasted preallocation that is never used.
+ * The largest aligned region that we'll try to allocate at the end of
+ * the file as it's extended.  This is also limited to the current file
+ * size so we can only waste at most twice the total file size when
+ * files are less than this.  We try to keep this around the point of
+ * diminishing returns in streaming performance of common data devices
+ * to limit waste.
  */
-#define SCOUTFS_DATA_PREALLOC_DEFAULT_BLOCKS \
+#define SCOUTFS_DATA_EXTEND_PREALLOC_LIMIT \
 	(8ULL * 1024 * 1024 >> SCOUTFS_BLOCK_SM_SHIFT)
 
 /*
@@ -35,10 +38,6 @@
 #define SCOUTFS_ALLOC_DATA_LG_THRESH \
 	(8ULL * 1024 * 1024 >> SCOUTFS_BLOCK_SM_SHIFT)
 
-/* the client will force commits if data allocators get too low */
-#define SCOUTFS_ALLOC_DATA_REFILL_THRESH \
-	((256ULL * 1024 * 1024) >> SCOUTFS_BLOCK_SM_SHIFT)
-
 /*
  * Fill client alloc roots to the target when they fall below the lo
  * threshold.
@@ -56,16 +55,15 @@
 #define SCOUTFS_SERVER_DATA_FILL_LO \
 	(1ULL * 1024 * 1024 * 1024 >> SCOUTFS_BLOCK_SM_SHIFT)
 
-
 /*
- * Log merge meta allocations are only used for one request and will
- * never use more than the dirty limit.
+ * Each of the server meta_alloc roots will try to keep a minimum amount
+ * of free blocks.  The server will swap roots when its current avail
+ * falls below the threshold while the freed root is still above it.  It
+ * must have room for all the largest allocation attempted in a
+ * transaction on the server.
  */
-#define SCOUTFS_LOG_MERGE_DIRTY_BYTE_LIMIT	(64ULL * 1024 * 1024)
-/* a few extra blocks for alloc blocks */
-#define SCOUTFS_SERVER_MERGE_FILL_TARGET	\
-	((SCOUTFS_LOG_MERGE_DIRTY_BYTE_LIMIT >> SCOUTFS_BLOCK_LG_SHIFT) + 4)
-#define SCOUTFS_SERVER_MERGE_FILL_LO		SCOUTFS_SERVER_MERGE_FILL_TARGET
+#define SCOUTFS_SERVER_META_ALLOC_MIN \
+	(SCOUTFS_SERVER_META_FILL_TARGET * 2)
 
 /*
  * A run-time use of a pair of persistent avail/freed roots as a
@@ -127,14 +125,7 @@ int scoutfs_free_data(struct super_block *sb, struct scoutfs_alloc *alloc,
 int scoutfs_alloc_move(struct super_block *sb, struct scoutfs_alloc *alloc,
 		       struct scoutfs_block_writer *wri,
 		       struct scoutfs_alloc_root *dst,
-		       struct scoutfs_alloc_root *src, u64 total,
-		       __le64 *exclusive, __le64 *vacant, u64 zone_blocks, u64 meta_budget);
-int scoutfs_alloc_insert(struct super_block *sb, struct scoutfs_alloc *alloc,
-			 struct scoutfs_block_writer *wri, struct scoutfs_alloc_root *root,
-			 u64 start, u64 len);
-int scoutfs_alloc_remove(struct super_block *sb, struct scoutfs_alloc *alloc,
-			 struct scoutfs_block_writer *wri, struct scoutfs_alloc_root *root,
-			 u64 start, u64 len);
+		       struct scoutfs_alloc_root *src, u64 total);
 
 int scoutfs_alloc_fill_list(struct super_block *sb,
 			    struct scoutfs_alloc *alloc,
@@ -155,23 +146,11 @@ int scoutfs_alloc_splice_list(struct super_block *sb,
 
 bool scoutfs_alloc_meta_low(struct super_block *sb,
 			    struct scoutfs_alloc *alloc, u32 nr);
-void scoutfs_alloc_meta_remaining(struct scoutfs_alloc *alloc, u32 *avail_total, u32 *freed_space);
-bool scoutfs_alloc_meta_low_since(struct scoutfs_alloc *alloc, u32 avail_start, u32 freed_start,
-				  u32 budget, u32 nr);
-bool scoutfs_alloc_test_flag(struct super_block *sb,
-			    struct scoutfs_alloc *alloc, u32 flag);
 
 typedef int (*scoutfs_alloc_foreach_cb_t)(struct super_block *sb, void *arg,
 					  int owner, u64 id,
 					  bool meta, bool avail, u64 blocks);
 int scoutfs_alloc_foreach(struct super_block *sb,
 			  scoutfs_alloc_foreach_cb_t cb, void *arg);
-int scoutfs_alloc_foreach_super(struct super_block *sb, struct scoutfs_super_block *super,
-				scoutfs_alloc_foreach_cb_t cb, void *arg);
-
-typedef void (*scoutfs_alloc_extent_cb_t)(struct super_block *sb, void *cb_arg,
-					  struct scoutfs_extent *ext);
-int scoutfs_alloc_extents_cb(struct super_block *sb, struct scoutfs_alloc_root *root,
-			     scoutfs_alloc_extent_cb_t cb, void *cb_arg);
 
 #endif

kmod/src/block.c

@@ -21,7 +21,6 @@
 #include <linux/blkdev.h>
 #include <linux/rhashtable.h>
 #include <linux/random.h>
-#include <linux/sched/mm.h>
 
 #include "format.h"
 #include "super.h"
@@ -31,7 +30,6 @@
 #include "scoutfs_trace.h"
 #include "alloc.h"
 #include "triggers.h"
-#include "util.h"
 
 /*
  * The scoutfs block cache manages metadata blocks that can be larger
@@ -59,7 +57,7 @@ struct block_info {
 	atomic64_t access_counter;
 	struct rhashtable ht;
 	wait_queue_head_t waitq;
-	KC_DEFINE_SHRINKER(shrinker);
+	struct shrinker shrinker;
 	struct work_struct free_work;
 	struct llist_head free_llist;
 };
@@ -130,7 +128,6 @@ static __le32 block_calc_crc(struct scoutfs_block_header *hdr, u32 size)
 static struct block_private *block_alloc(struct super_block *sb, u64 blkno)
 {
 	struct block_private *bp;
-	unsigned int nofs_flags;
 
 	/*
 	 * If we had multiple blocks per page we'd need to be a little
@@ -150,19 +147,8 @@ static struct block_private *block_alloc(struct super_block *sb, u64 blkno)
 		set_bit(BLOCK_BIT_PAGE_ALLOC, &bp->bits);
 		bp->bl.data = page_address(bp->page);
 	} else {
-		/*
-		 * __vmalloc doesn't pass the gfp flags down to pte
-		 * allocs, they're done with user alloc flags.
-		 * Unfortunately, some lockdep doesn't know that
-		 * PF_NOMEMALLOC prevents __GFP_FS reclaim and generates
-		 * spurious reclaim-on dependencies and warnings.
-		 */
-		lockdep_off();
-		nofs_flags = memalloc_nofs_save();
-		bp->virt = __vmalloc(SCOUTFS_BLOCK_LG_SIZE, GFP_NOFS | __GFP_HIGHMEM, PAGE_KERNEL);
-		memalloc_nofs_restore(nofs_flags);
-		lockdep_on();
-
+		bp->virt = __vmalloc(SCOUTFS_BLOCK_LG_SIZE,
+				     GFP_NOFS | __GFP_HIGHMEM, PAGE_KERNEL);
 		if (!bp->virt) {
 			kfree(bp);
 			bp = NULL;
@@ -202,9 +188,7 @@ static void block_free(struct super_block *sb, struct block_private *bp)
 	else
 		BUG();
 
-	/* ok to tear down dirty blocks when forcing unmount */
-	WARN_ON_ONCE(!scoutfs_forcing_unmount(sb) && !list_empty(&bp->dirty_entry));
-
+	WARN_ON_ONCE(!list_empty(&bp->dirty_entry));
 	WARN_ON_ONCE(atomic_read(&bp->refcount));
 	WARN_ON_ONCE(atomic_read(&bp->io_count));
 	kfree(bp);
@@ -302,16 +286,10 @@ static int block_insert(struct super_block *sb, struct block_private *bp)
 
 	WARN_ON_ONCE(atomic_read(&bp->refcount) & BLOCK_REF_INSERTED);
 
-retry:
 	atomic_add(BLOCK_REF_INSERTED, &bp->refcount);
-	ret = rhashtable_lookup_insert_fast(&binf->ht, &bp->ht_head, block_ht_params);
+	ret = rhashtable_insert_fast(&binf->ht, &bp->ht_head, block_ht_params);
 	if (ret < 0) {
 		atomic_sub(BLOCK_REF_INSERTED, &bp->refcount);
-		if (ret == -EBUSY) {
-			/* wait for pending rebalance to finish */
-			synchronize_rcu();
-			goto retry;
-		}
 	} else {
 		atomic_inc(&binf->total_inserted);
 		TRACE_BLOCK(insert, bp);
@@ -418,7 +396,6 @@ static void block_remove_all(struct super_block *sb)
 
 		if (block_get_if_inserted(bp)) {
 			block_remove(sb, bp);
-			WARN_ON_ONCE(atomic_read(&bp->refcount) != 1);
 			block_put(sb, bp);
 		}
 	}
@@ -438,10 +415,11 @@ static void block_remove_all(struct super_block *sb)
  * possible.  Final freeing, verifying checksums, and unlinking errored
  * blocks are all done by future users of the blocks.
  */
-static void block_end_io(struct super_block *sb, unsigned int opf,
+static void block_end_io(struct super_block *sb, int rw,
 			 struct block_private *bp, int err)
 {
 	DECLARE_BLOCK_INFO(sb, binf);
+	bool is_read = !(rw & WRITE);
 
 	if (err) {
 		scoutfs_inc_counter(sb, block_cache_end_io_error);
@@ -451,7 +429,7 @@ static void block_end_io(struct super_block *sb, unsigned int opf,
 	if (!atomic_dec_and_test(&bp->io_count))
 		return;
 
-	if (!op_is_write(opf) && !test_bit(BLOCK_BIT_ERROR, &bp->bits))
+	if (is_read && !test_bit(BLOCK_BIT_ERROR, &bp->bits))
 		set_bit(BLOCK_BIT_UPTODATE, &bp->bits);
 
 	clear_bit(BLOCK_BIT_IO_BUSY, &bp->bits);
@@ -464,13 +442,13 @@ static void block_end_io(struct super_block *sb, unsigned int opf,
 		wake_up(&binf->waitq);
 }
 
-static void KC_DECLARE_BIO_END_IO(block_bio_end_io, struct bio *bio)
+static void block_bio_end_io(struct bio *bio, int err)
 {
 	struct block_private *bp = bio->bi_private;
 	struct super_block *sb = bp->sb;
 
 	TRACE_BLOCK(end_io, bp);
-	block_end_io(sb, kc_bio_get_opf(bio), bp, kc_bio_get_errno(bio));
+	block_end_io(sb, bio->bi_rw, bp, err);
 	bio_put(bio);
 }
 
@@ -478,7 +456,7 @@ static void KC_DECLARE_BIO_END_IO(block_bio_end_io, struct bio *bio)
  * Kick off IO for a single block.
  */
 static int block_submit_bio(struct super_block *sb, struct block_private *bp,
-			    unsigned int opf)
+			    int rw)
 {
 	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
 	struct bio *bio = NULL;
@@ -488,9 +466,6 @@ static int block_submit_bio(struct super_block *sb, struct block_private *bp,
 	sector_t sector;
 	int ret = 0;
 
-	if (scoutfs_forcing_unmount(sb))
-		return -EIO;
-
 	sector = bp->bl.blkno << (SCOUTFS_BLOCK_LG_SHIFT - 9);
 
 	WARN_ON_ONCE(bp->bl.blkno == U64_MAX);
@@ -511,9 +486,8 @@ static int block_submit_bio(struct super_block *sb, struct block_private *bp,
 				break;
 			}
 
-			kc_bio_set_opf(bio, opf);
-			kc_bio_set_sector(bio, sector + (off >> 9));
-			bio_set_dev(bio, sbi->meta_bdev);
+			bio->bi_sector = sector + (off >> 9);
+			bio->bi_bdev = sbi->meta_bdev;
 			bio->bi_end_io = block_bio_end_io;
 			bio->bi_private = bp;
 
@@ -530,18 +504,18 @@ static int block_submit_bio(struct super_block *sb, struct block_private *bp,
 			BUG();
 
 		if (!bio_add_page(bio, page, PAGE_SIZE, 0)) {
-			kc_submit_bio(bio);
+			submit_bio(rw, bio);
 			bio = NULL;
 		}
 	}
 
 	if (bio)
-		kc_submit_bio(bio);
+		submit_bio(rw, bio);
 
 	blk_finish_plug(&plug);
 
 	/* let racing end_io know we're done */
-	block_end_io(sb, opf, bp, ret);
+	block_end_io(sb, rw, bp, ret);
 
 	return ret;
 }
@@ -642,16 +616,14 @@ static struct block_private *block_read(struct super_block *sb, u64 blkno)
 
 	if (!test_bit(BLOCK_BIT_UPTODATE, &bp->bits) &&
 	     test_and_clear_bit(BLOCK_BIT_NEW, &bp->bits)) {
-		ret = block_submit_bio(sb, bp, REQ_OP_READ);
+		ret = block_submit_bio(sb, bp, READ);
 		if (ret < 0)
 			goto out;
 	}
 
-	wait_event(binf->waitq, uptodate_or_error(bp));
-	if (test_bit(BLOCK_BIT_ERROR, &bp->bits))
+	ret = wait_event_interruptible(binf->waitq, uptodate_or_error(bp));
+	if (ret == 0 && test_bit(BLOCK_BIT_ERROR, &bp->bits))
 		ret = -EIO;
-	else
-		ret = 0;
 
 out:
 	if (ret < 0) {
@@ -679,7 +651,7 @@ out:
 int scoutfs_block_read_ref(struct super_block *sb, struct scoutfs_block_ref *ref, u32 magic,
 			   struct scoutfs_block **bl_ret)
 {
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
+	struct scoutfs_super_block *super = &SCOUTFS_SB(sb)->super;
 	struct scoutfs_block_header *hdr;
 	struct block_private *bp = NULL;
 	bool retried = false;
@@ -703,7 +675,7 @@ retry:
 		set_bit(BLOCK_BIT_CRC_VALID, &bp->bits);
 	}
 
-	if (hdr->magic != cpu_to_le32(magic) || hdr->fsid != cpu_to_le64(sbi->fsid) ||
+	if (hdr->magic != cpu_to_le32(magic) || hdr->fsid != super->hdr.fsid ||
 	    hdr->seq != ref->seq || hdr->blkno != ref->blkno) {
 		ret = -ESTALE;
 		goto out;
@@ -730,36 +702,6 @@ out:
 	return ret;
 }
 
-static bool stale_refs_match(struct scoutfs_block_ref *caller, struct scoutfs_block_ref *saved)
-{
-	return !caller || (caller->blkno == saved->blkno && caller->seq == saved->seq);
-}
-
-/*
- * Check if a read of a reference that gave ESTALE should be retried or
- * should generate a hard error.  If this is the second time we got
- * ESTALE from the same refs then we return EIO and the caller should
- * stop.  As long as we keep seeing different refs we'll return ESTALE
- * and the caller can keep trying.
- */
-int scoutfs_block_check_stale(struct super_block *sb, int ret,
-			      struct scoutfs_block_saved_refs *saved,
-			      struct scoutfs_block_ref *a, struct scoutfs_block_ref *b)
-{
-	if (ret == -ESTALE) {
-		if (stale_refs_match(a, &saved->refs[0]) && stale_refs_match(b, &saved->refs[1])){
-			ret = -EIO;
-		} else {
-			if (a)
-				saved->refs[0] = *a;
-			if (b)
-				saved->refs[1] = *b;
-		}
-	}
-
-	return ret;
-}
-
 void scoutfs_block_put(struct super_block *sb, struct scoutfs_block *bl)
 {
 	if (!IS_ERR_OR_NULL(bl))
@@ -829,7 +771,7 @@ int scoutfs_block_dirty_ref(struct super_block *sb, struct scoutfs_alloc *alloc,
 			    u32 magic, struct scoutfs_block **bl_ret,
 			    u64 dirty_blkno, u64 *ref_blkno)
 {
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
+	struct scoutfs_super_block *super = &SCOUTFS_SB(sb)->super;
 	struct scoutfs_block *cow_bl = NULL;
 	struct scoutfs_block *bl = NULL;
 	struct block_private *exist_bp = NULL;
@@ -897,7 +839,7 @@ int scoutfs_block_dirty_ref(struct super_block *sb, struct scoutfs_alloc *alloc,
 
 	hdr = bl->data;
 	hdr->magic = cpu_to_le32(magic);
-	hdr->fsid = cpu_to_le64(sbi->fsid);
+	hdr->fsid = super->hdr.fsid;
 	hdr->blkno = cpu_to_le64(bl->blkno);
 	prandom_bytes(&hdr->seq, sizeof(hdr->seq));
 
@@ -971,7 +913,7 @@ int scoutfs_block_writer_write(struct super_block *sb,
 		/* retry previous write errors */
 		clear_bit(BLOCK_BIT_ERROR, &bp->bits);
 
-		ret = block_submit_bio(sb, bp, REQ_OP_WRITE);
+		ret = block_submit_bio(sb, bp, WRITE);
 		if (ret < 0)
 			break;
 	}
@@ -1071,16 +1013,6 @@ u64 scoutfs_block_writer_dirty_bytes(struct super_block *sb,
 	return wri->nr_dirty_blocks * SCOUTFS_BLOCK_LG_SIZE;
 }
 
-static unsigned long block_count_objects(struct shrinker *shrink, struct shrink_control *sc)
-{
-	struct block_info *binf = KC_SHRINKER_CONTAINER_OF(shrink, struct block_info);
-	struct super_block *sb = binf->sb;
-
-	scoutfs_inc_counter(sb, block_cache_count_objects);
-
-	return shrinker_min_long(atomic_read(&binf->total_inserted));
-}
-
 /*
  * Remove a number of cached blocks that haven't been used recently.
  *
@@ -1101,19 +1033,25 @@ static unsigned long block_count_objects(struct shrinker *shrink, struct shrink_
  * atomically remove blocks when the only references are ours and the
  * hash table.
  */
-static unsigned long block_scan_objects(struct shrinker *shrink, struct shrink_control *sc)
+static int block_shrink(struct shrinker *shrink, struct shrink_control *sc)
 {
-	struct block_info *binf = KC_SHRINKER_CONTAINER_OF(shrink, struct block_info);
+	struct block_info *binf = container_of(shrink, struct block_info,
+					       shrinker);
 	struct super_block *sb = binf->sb;
 	struct rhashtable_iter iter;
 	struct block_private *bp;
-	bool stop = false;
-	unsigned long freed = 0;
-	unsigned long nr = sc->nr_to_scan;
+	unsigned long nr;
 	u64 recently;
 
-	scoutfs_inc_counter(sb, block_cache_scan_objects);
+	nr = sc->nr_to_scan;
+	if (nr == 0)
+		goto out;
 
+	scoutfs_inc_counter(sb, block_cache_shrink);
+
+	nr = DIV_ROUND_UP(nr, SCOUTFS_BLOCK_LG_PAGES_PER);
+
+restart:
 	recently = accessed_recently(binf);
 	rhashtable_walk_enter(&binf->ht, &iter);
 	rhashtable_walk_start(&iter);
@@ -1135,15 +1073,11 @@ static unsigned long block_scan_objects(struct shrinker *shrink, struct shrink_c
 		if (bp == NULL)
 			break;
 		if (bp == ERR_PTR(-EAGAIN)) {
-			/*
-			 * We can be called from reclaim in the allocation
-			 * to resize the hash table itself.  We have to
-			 * return so that the caller can proceed and
-			 * enable hash table iteration again.
-			 */
-			scoutfs_inc_counter(sb, block_cache_shrink_stop);
-			stop = true;
-			break;
+			/* hard reset to not hold rcu grace period across retries */
+			rhashtable_walk_stop(&iter);
+			rhashtable_walk_exit(&iter);
+			scoutfs_inc_counter(sb, block_cache_shrink_restart);
+			goto restart;
 		}
 
 		scoutfs_inc_counter(sb, block_cache_shrink_next);
@@ -1157,7 +1091,6 @@ static unsigned long block_scan_objects(struct shrinker *shrink, struct shrink_c
 			if (block_remove_solo(sb, bp)) {
 				scoutfs_inc_counter(sb, block_cache_shrink_remove);
 				TRACE_BLOCK(shrink, bp);
-				freed++;
 				nr--;
 			}
 			block_put(sb, bp);
@@ -1166,11 +1099,9 @@ static unsigned long block_scan_objects(struct shrinker *shrink, struct shrink_c
 
 	rhashtable_walk_stop(&iter);
 	rhashtable_walk_exit(&iter);
-
-	if (stop)
-		return SHRINK_STOP;
-	else
-		return freed;
+out:
+	return min_t(u64, (u64)atomic_read(&binf->total_inserted) * SCOUTFS_BLOCK_LG_PAGES_PER,
+		     INT_MAX);
 }
 
 struct sm_block_completion {
@@ -1178,11 +1109,11 @@ struct sm_block_completion {
 	int err;
 };
 
-static void KC_DECLARE_BIO_END_IO(sm_block_bio_end_io, struct bio *bio)
+static void sm_block_bio_end_io(struct bio *bio, int err)
 {
 	struct sm_block_completion *sbc = bio->bi_private;
 
-	sbc->err = kc_bio_get_errno(bio);
+	sbc->err = err;
 	complete(&sbc->comp);
 	bio_put(bio);
 }
@@ -1197,8 +1128,9 @@ static void KC_DECLARE_BIO_END_IO(sm_block_bio_end_io, struct bio *bio)
  * only layer that sees the full block buffer so we pass the calculated
  * crc to the caller for them to check in their context.
  */
-static int sm_block_io(struct super_block *sb, struct block_device *bdev, unsigned int opf,
-		       u64 blkno, struct scoutfs_block_header *hdr, size_t len, __le32 *blk_crc)
+static int sm_block_io(struct block_device *bdev, int rw, u64 blkno,
+		       struct scoutfs_block_header *hdr, size_t len,
+		       __le32 *blk_crc)
 {
 	struct scoutfs_block_header *pg_hdr;
 	struct sm_block_completion sbc;
@@ -1208,11 +1140,8 @@ static int sm_block_io(struct super_block *sb, struct block_device *bdev, unsign
 
 	BUILD_BUG_ON(PAGE_SIZE < SCOUTFS_BLOCK_SM_SIZE);
 
-	if (scoutfs_forcing_unmount(sb))
-		return -EIO;
-
 	if (WARN_ON_ONCE(len > SCOUTFS_BLOCK_SM_SIZE) ||
-	    WARN_ON_ONCE(!op_is_write(opf) && !blk_crc))
+	    WARN_ON_ONCE(!(rw & WRITE) && !blk_crc))
 		return -EINVAL;
 
 	page = alloc_page(GFP_NOFS);
@@ -1221,7 +1150,7 @@ static int sm_block_io(struct super_block *sb, struct block_device *bdev, unsign
 
 	pg_hdr = page_address(page);
 
-	if (op_is_write(opf)) {
+	if (rw & WRITE) {
 		memcpy(pg_hdr, hdr, len);
 		if (len < SCOUTFS_BLOCK_SM_SIZE)
 			memset((char *)pg_hdr + len, 0,
@@ -1235,9 +1164,8 @@ static int sm_block_io(struct super_block *sb, struct block_device *bdev, unsign
 		goto out;
 	}
 
-	kc_bio_set_opf(bio, opf | REQ_SYNC);
-	kc_bio_set_sector(bio, blkno << (SCOUTFS_BLOCK_SM_SHIFT - 9));
-	bio_set_dev(bio, bdev);
+	bio->bi_sector = blkno << (SCOUTFS_BLOCK_SM_SHIFT - 9);
+	bio->bi_bdev = bdev;
 	bio->bi_end_io = sm_block_bio_end_io;
 	bio->bi_private = &sbc;
 	bio_add_page(bio, page, SCOUTFS_BLOCK_SM_SIZE, 0);
@@ -1245,12 +1173,12 @@ static int sm_block_io(struct super_block *sb, struct block_device *bdev, unsign
 	init_completion(&sbc.comp);
 	sbc.err = 0;
 
-	kc_submit_bio(bio);
+	submit_bio((rw & WRITE) ? WRITE_SYNC : READ_SYNC, bio);
 
 	wait_for_completion(&sbc.comp);
 	ret = sbc.err;
 
-	if (ret == 0 && !op_is_write(opf)) {
+	if (ret == 0 && !(rw & WRITE)) {
 		memcpy(hdr, pg_hdr, len);
 		*blk_crc = block_calc_crc(pg_hdr, SCOUTFS_BLOCK_SM_SIZE);
 	}
@@ -1264,14 +1192,14 @@ int scoutfs_block_read_sm(struct super_block *sb,
 			  struct scoutfs_block_header *hdr, size_t len,
 			  __le32 *blk_crc)
 {
-	return sm_block_io(sb, bdev, REQ_OP_READ, blkno, hdr, len, blk_crc);
+	return sm_block_io(bdev, READ, blkno, hdr, len, blk_crc);
 }
 
 int scoutfs_block_write_sm(struct super_block *sb,
 			   struct block_device *bdev, u64 blkno,
 			   struct scoutfs_block_header *hdr, size_t len)
 {
-	return sm_block_io(sb, bdev, REQ_OP_WRITE, blkno, hdr, len, NULL);
+	return sm_block_io(bdev, WRITE, blkno, hdr, len, NULL);
 }
 
 int scoutfs_block_setup(struct super_block *sb)
@@ -1296,9 +1224,9 @@ int scoutfs_block_setup(struct super_block *sb)
 	atomic_set(&binf->total_inserted, 0);
 	atomic64_set(&binf->access_counter, 0);
 	init_waitqueue_head(&binf->waitq);
-	KC_INIT_SHRINKER_FUNCS(&binf->shrinker, block_count_objects,
-			       block_scan_objects);
-	KC_REGISTER_SHRINKER(&binf->shrinker);
+	binf->shrinker.shrink = block_shrink;
+	binf->shrinker.seeks = DEFAULT_SEEKS;
+	register_shrinker(&binf->shrinker);
 	INIT_WORK(&binf->free_work, block_free_work);
 	init_llist_head(&binf->free_llist);
 
@@ -1309,7 +1237,7 @@ out:
 	if (ret)
 		scoutfs_block_destroy(sb);
 
-	return ret;
+	return 0;
 }
 
 void scoutfs_block_destroy(struct super_block *sb)
@@ -1318,7 +1246,7 @@ void scoutfs_block_destroy(struct super_block *sb)
 	struct block_info *binf = SCOUTFS_SB(sb)->block_info;
 
 	if (binf) {
-		KC_UNREGISTER_SHRINKER(&binf->shrinker);
+		unregister_shrinker(&binf->shrinker);
 		block_remove_all(sb);
 		flush_work(&binf->free_work);
 		rhashtable_destroy(&binf->ht);

kmod/src/block.h

@@ -13,17 +13,6 @@ struct scoutfs_block {
 	void *priv;
 };
 
-struct scoutfs_block_saved_refs {
-	struct scoutfs_block_ref refs[2];
-};
-
-#define DECLARE_SAVED_REFS(name) \
-	struct scoutfs_block_saved_refs name = {{{0,}}}
-
-int scoutfs_block_check_stale(struct super_block *sb, int ret,
-			      struct scoutfs_block_saved_refs *saved,
-			      struct scoutfs_block_ref *a, struct scoutfs_block_ref *b);
-
 int scoutfs_block_read_ref(struct super_block *sb, struct scoutfs_block_ref *ref, u32 magic,
 			   struct scoutfs_block **bl_ret);
 void scoutfs_block_put(struct super_block *sb, struct scoutfs_block *bl);

kmod/src/btree.h

@@ -20,15 +20,13 @@ struct scoutfs_btree_item_ref {
 
 /* caller gives an item to the callback */
 typedef int (*scoutfs_btree_item_cb)(struct super_block *sb,
-				     struct scoutfs_key *key, u64 seq, u8 flags,
+				     struct scoutfs_key *key,
 				     void *val, int val_len, void *arg);
 
 /* simple singly-linked list of items */
 struct scoutfs_btree_item_list {
 	struct scoutfs_btree_item_list *next;
 	struct scoutfs_key key;
-	u64 seq;
-	u8 flags;
 	int val_len;
 	u8 val[0];
 };
@@ -84,49 +82,6 @@ int scoutfs_btree_insert_list(struct super_block *sb,
 			      struct scoutfs_btree_root *root,
 			      struct scoutfs_btree_item_list *lst);
 
-int scoutfs_btree_parent_range(struct super_block *sb,
-			       struct scoutfs_btree_root *root,
-			       struct scoutfs_key *key,
-			       struct scoutfs_key *start,
-			       struct scoutfs_key *end);
-int scoutfs_btree_get_parent(struct super_block *sb,
-			     struct scoutfs_btree_root *root,
-			     struct scoutfs_key *key,
-			     struct scoutfs_btree_root *par_root);
-int scoutfs_btree_set_parent(struct super_block *sb,
-			     struct scoutfs_alloc *alloc,
-			     struct scoutfs_block_writer *wri,
-			     struct scoutfs_btree_root *root,
-			     struct scoutfs_key *key,
-			     struct scoutfs_btree_root *par_root);
-int scoutfs_btree_rebalance(struct super_block *sb,
-			    struct scoutfs_alloc *alloc,
-			    struct scoutfs_block_writer *wri,
-			    struct scoutfs_btree_root *root,
-			    struct scoutfs_key *key);
-
-/* merge input is a list of roots */
-struct scoutfs_btree_root_head {
-	struct list_head head;
-	struct scoutfs_btree_root root;
-};
-
-int scoutfs_btree_merge(struct super_block *sb,
-			struct scoutfs_alloc *alloc,
-			struct scoutfs_block_writer *wri,
-			struct scoutfs_key *start,
-			struct scoutfs_key *end,
-			struct scoutfs_key *next_ret,
-			struct scoutfs_btree_root *root,
-			struct list_head *input_list,
-			bool subtree, int dirty_limit, int alloc_low);
-
-int scoutfs_btree_free_blocks(struct super_block *sb,
-			      struct scoutfs_alloc *alloc,
-			      struct scoutfs_block_writer *wri,
-			      struct scoutfs_key *key,
-			      struct scoutfs_btree_root *root, int free_budget);
-
 void scoutfs_btree_put_iref(struct scoutfs_btree_item_ref *iref);
 
 #endif

kmod/src/client.c

@@ -31,8 +31,6 @@
 #include "net.h"
 #include "endian_swap.h"
 #include "quorum.h"
-#include "omap.h"
-#include "trans.h"
 
 /*
  * The client is responsible for maintaining a connection to the server.
@@ -49,7 +47,6 @@ struct client_info {
 
 	struct workqueue_struct *workq;
 	struct delayed_work connect_dwork;
-	unsigned long connect_delay_jiffies;
 
 	u64 server_term;
 
@@ -117,6 +114,21 @@ int scoutfs_client_get_roots(struct super_block *sb,
 					NULL, 0, roots, sizeof(*roots));
 }
 
+int scoutfs_client_advance_seq(struct super_block *sb, u64 *seq)
+{
+	struct client_info *client = SCOUTFS_SB(sb)->client_info;
+	__le64 leseq;
+	int ret;
+
+	ret = scoutfs_net_sync_request(sb, client->conn,
+				       SCOUTFS_NET_CMD_ADVANCE_SEQ,
+				       NULL, 0, &leseq, sizeof(leseq));
+	if (ret == 0)
+		*seq = le64_to_cpu(leseq);
+
+	return ret;
+}
+
 int scoutfs_client_get_last_seq(struct super_block *sb, u64 *seq)
 {
 	struct client_info *client = SCOUTFS_SB(sb)->client_info;
@@ -138,7 +150,7 @@ static int client_lock_response(struct super_block *sb,
 				void *resp, unsigned int resp_len,
 				int error, void *data)
 {
-	if (resp_len != sizeof(struct scoutfs_net_lock))
+	if (resp_len != sizeof(struct scoutfs_net_lock_grant_response))
 		return -EINVAL;
 
 	/* XXX error? */
@@ -203,120 +215,6 @@ int scoutfs_client_srch_commit_compact(struct super_block *sb,
 					res, sizeof(*res), NULL, 0);
 }
 
-int scoutfs_client_get_log_merge(struct super_block *sb,
-				 struct scoutfs_log_merge_request *req)
-{
-	struct client_info *client = SCOUTFS_SB(sb)->client_info;
-
-	return scoutfs_net_sync_request(sb, client->conn,
-					SCOUTFS_NET_CMD_GET_LOG_MERGE,
-					NULL, 0, req, sizeof(*req));
-}
-
-int scoutfs_client_commit_log_merge(struct super_block *sb,
-				    struct scoutfs_log_merge_complete *comp)
-{
-	struct client_info *client = SCOUTFS_SB(sb)->client_info;
-
-	return scoutfs_net_sync_request(sb, client->conn,
-					SCOUTFS_NET_CMD_COMMIT_LOG_MERGE,
-					comp, sizeof(*comp), NULL, 0);
-}
-
-int scoutfs_client_send_omap_response(struct super_block *sb, u64 id,
-				      struct scoutfs_open_ino_map *map)
-{
-	struct client_info *client = SCOUTFS_SB(sb)->client_info;
-
-	return scoutfs_net_response(sb, client->conn, SCOUTFS_NET_CMD_OPEN_INO_MAP,
-				    id, 0, map, sizeof(*map));
-}
-
-/* The client is receiving an omap request from the server */
-static int client_open_ino_map(struct super_block *sb, struct scoutfs_net_connection *conn,
-			       u8 cmd, u64 id, void *arg, u16 arg_len)
-{
-	if (arg_len != sizeof(struct scoutfs_open_ino_map_args))
-		return -EINVAL;
-
-	return scoutfs_omap_client_handle_request(sb, id, arg);
-}
-
-/* The client is sending an omap request to the server */
-int scoutfs_client_open_ino_map(struct super_block *sb, u64 group_nr,
-				struct scoutfs_open_ino_map *map)
-{
-	struct client_info *client = SCOUTFS_SB(sb)->client_info;
-	struct scoutfs_open_ino_map_args args = {
-		.group_nr = cpu_to_le64(group_nr),
-		.req_id = 0,
-	};
-
-	return scoutfs_net_sync_request(sb, client->conn, SCOUTFS_NET_CMD_OPEN_INO_MAP,
-					&args, sizeof(args), map, sizeof(*map));
-}
-
-/* The client is asking the server for the current volume options */
-int scoutfs_client_get_volopt(struct super_block *sb, struct scoutfs_volume_options *volopt)
-{
-	struct client_info *client = SCOUTFS_SB(sb)->client_info;
-
-	return scoutfs_net_sync_request(sb, client->conn, SCOUTFS_NET_CMD_GET_VOLOPT,
-					NULL, 0, volopt, sizeof(*volopt));
-}
-
-/* The client is asking the server to update volume options */
-int scoutfs_client_set_volopt(struct super_block *sb, struct scoutfs_volume_options *volopt)
-{
-	struct client_info *client = SCOUTFS_SB(sb)->client_info;
-
-	return scoutfs_net_sync_request(sb, client->conn, SCOUTFS_NET_CMD_SET_VOLOPT,
-					volopt, sizeof(*volopt), NULL, 0);
-}
-
-/* The client is asking the server to clear volume options */
-int scoutfs_client_clear_volopt(struct super_block *sb, struct scoutfs_volume_options *volopt)
-{
-	struct client_info *client = SCOUTFS_SB(sb)->client_info;
-
-	return scoutfs_net_sync_request(sb, client->conn, SCOUTFS_NET_CMD_CLEAR_VOLOPT,
-					volopt, sizeof(*volopt), NULL, 0);
-}
-
-int scoutfs_client_resize_devices(struct super_block *sb, struct scoutfs_net_resize_devices *nrd)
-{
-	struct client_info *client = SCOUTFS_SB(sb)->client_info;
-
-	return scoutfs_net_sync_request(sb, client->conn, SCOUTFS_NET_CMD_RESIZE_DEVICES,
-					nrd, sizeof(*nrd), NULL, 0);
-}
-
-int scoutfs_client_statfs(struct super_block *sb, struct scoutfs_net_statfs *nst)
-{
-	struct client_info *client = SCOUTFS_SB(sb)->client_info;
-
-	return scoutfs_net_sync_request(sb, client->conn, SCOUTFS_NET_CMD_STATFS,
-					NULL, 0, nst, sizeof(*nst));
-}
-
-/*
- * The server is asking that we trigger a commit of the current log
- * trees so that they can ensure an item seq discontinuity between
- * finalized log btrees and the next set of open log btrees.  If we're
- * shutting down then we're already going to perform a final commit.
- */
-static int sync_log_trees(struct super_block *sb, struct scoutfs_net_connection *conn,
-			  u8 cmd, u64 id, void *arg, u16 arg_len)
-{
-	if (arg_len != 0)
-		return -EINVAL;
-
-	if (!scoutfs_unmounting(sb))
-		scoutfs_trans_sync(sb, 0);
-
-	return scoutfs_net_response(sb, conn, cmd, id, 0, NULL, 0);
-}
-
 /* The client is receiving a invalidation request from the server */
 static int client_lock(struct super_block *sb,
 		       struct scoutfs_net_connection *conn, u8 cmd, u64 id,
@@ -354,8 +252,8 @@ static int client_greeting(struct super_block *sb,
 			   void *resp, unsigned int resp_len, int error,
 			   void *data)
 {
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-	struct client_info *client = sbi->client_info;
+	struct client_info *client = SCOUTFS_SB(sb)->client_info;
+	struct scoutfs_super_block *super = &SCOUTFS_SB(sb)->super;
 	struct scoutfs_net_greeting *gr = resp;
 	bool new_server;
 	int ret;
@@ -370,16 +268,18 @@ static int client_greeting(struct super_block *sb,
 		goto out;
 	}
 
-	if (gr->fsid != cpu_to_le64(sbi->fsid)) {
-		scoutfs_warn(sb, "server greeting response fsid 0x%llx did not match client fsid 0x%llx",
-			     le64_to_cpu(gr->fsid), sbi->fsid);
+	if (gr->fsid != super->hdr.fsid) {
+		scoutfs_warn(sb, "server sent fsid 0x%llx, client has 0x%llx",
+			     le64_to_cpu(gr->fsid),
+			     le64_to_cpu(super->hdr.fsid));
 		ret = -EINVAL;
 		goto out;
 	}
 
-	if (le64_to_cpu(gr->fmt_vers) != sbi->fmt_vers) {
-		scoutfs_warn(sb, "server greeting response format version %llu did not match client format version %llu",
-			     le64_to_cpu(gr->fmt_vers), sbi->fmt_vers);
+	if (gr->version != super->version) {
+		scoutfs_warn(sb, "server sent format 0x%llx, client has 0x%llx",
+			     le64_to_cpu(gr->version),
+			     le64_to_cpu(super->version));
 		ret = -EINVAL;
 		goto out;
 	}
@@ -388,7 +288,6 @@ static int client_greeting(struct super_block *sb,
 	scoutfs_net_client_greeting(sb, conn, new_server);
 
 	client->server_term = le64_to_cpu(gr->server_term);
-	client->connect_delay_jiffies = 0;
 	ret = 0;
 out:
 	return ret;
@@ -438,20 +337,6 @@ out:
 	return ret;
 }
 
-/*
- * If we're not seeing successful connections we want to back off.  Each
- * connection attempt starts by setting a long connection work delay.
- * We only set a shorter delay if we see a greeting response from the
- * server.  At that point we'll try to immediately reconnect if the
- * connection is broken.
- */
-static void queue_connect_dwork(struct super_block *sb, struct client_info *client)
-{
-	if (!atomic_read(&client->shutting_down) && !scoutfs_forcing_unmount(sb))
-		queue_delayed_work(client->workq, &client->connect_dwork,
-				   client->connect_delay_jiffies);
-}
-
 /*
  * This work is responsible for maintaining a connection from the client
  * to the server.  It's queued on mount and disconnect and we requeue
@@ -475,15 +360,13 @@ static void scoutfs_client_connect_worker(struct work_struct *work)
 						  connect_dwork.work);
 	struct super_block *sb = client->sb;
 	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-	struct scoutfs_mount_options opts;
+	struct scoutfs_super_block *super = &sbi->super;
+	struct mount_options *opts = &sbi->opts;
+	const bool am_quorum = opts->quorum_slot_nr >= 0;
 	struct scoutfs_net_greeting greet;
 	struct sockaddr_in sin;
-	bool am_quorum;
 	int ret;
 
-	scoutfs_options_read(sb, &opts);
-	am_quorum = opts.quorum_slot_nr >= 0;
-
 	/* can unmount once server farewell handling removes our item */
 	if (client->sending_farewell &&
 	    lookup_mounted_client_item(sb, sbi->rid) == 0) {
@@ -493,9 +376,6 @@ static void scoutfs_client_connect_worker(struct work_struct *work)
 		goto out;
 	}
 
-	/* always wait a bit until a greeting response sets a lower delay */
-	client->connect_delay_jiffies = msecs_to_jiffies(CLIENT_CONNECT_DELAY_MS);
-
 	ret = scoutfs_quorum_server_sin(sb, &sin);
 	if (ret < 0)
 		goto out;
@@ -506,8 +386,8 @@ static void scoutfs_client_connect_worker(struct work_struct *work)
 		goto out;
 
 	/* send a greeting to verify endpoints of each connection */
-	greet.fsid = cpu_to_le64(sbi->fsid);
-	greet.fmt_vers = cpu_to_le64(sbi->fmt_vers);
+	greet.fsid = super->hdr.fsid;
+	greet.version = super->version;
 	greet.server_term = cpu_to_le64(client->server_term);
 	greet.rid = cpu_to_le64(sbi->rid);
 	greet.flags = 0;
@@ -523,15 +403,16 @@ static void scoutfs_client_connect_worker(struct work_struct *work)
 	if (ret)
 		scoutfs_net_shutdown(sb, client->conn);
 out:
-	if (ret)
-		queue_connect_dwork(sb, client);
+
+	/* always have a small delay before retrying to avoid storms */
+	if (ret && !atomic_read(&client->shutting_down))
+		queue_delayed_work(client->workq, &client->connect_dwork,
+				   msecs_to_jiffies(CLIENT_CONNECT_DELAY_MS));
 }
 
 static scoutfs_net_request_t client_req_funcs[] = {
-	[SCOUTFS_NET_CMD_SYNC_LOG_TREES]	= sync_log_trees,
 	[SCOUTFS_NET_CMD_LOCK]			= client_lock,
 	[SCOUTFS_NET_CMD_LOCK_RECOVER]		= client_lock_recover,
-	[SCOUTFS_NET_CMD_OPEN_INO_MAP]		= client_open_ino_map,
 };
 
 /*
@@ -544,7 +425,8 @@ static void client_notify_down(struct super_block *sb,
 {
 	struct client_info *client = SCOUTFS_SB(sb)->client_info;
 
-	queue_connect_dwork(sb, client);
+	if (!atomic_read(&client->shutting_down))
+		queue_delayed_work(client->workq, &client->connect_dwork, 0);
 }
 
 int scoutfs_client_setup(struct super_block *sb)
@@ -579,7 +461,7 @@ int scoutfs_client_setup(struct super_block *sb)
 		goto out;
 	}
 
-	queue_connect_dwork(sb, client);
+	queue_delayed_work(client->workq, &client->connect_dwork, 0);
 	ret = 0;
 
 out:
@@ -636,7 +518,7 @@ void scoutfs_client_destroy(struct super_block *sb)
 	if (client == NULL)
 		return;
 
-	if (client->server_term != 0 && !scoutfs_forcing_unmount(sb)) {
+	if (client->server_term != 0) {
 		client->sending_farewell = true;
 		ret = scoutfs_net_submit_request(sb, client->conn,
 						 SCOUTFS_NET_CMD_FAREWELL,
@@ -644,8 +526,10 @@ void scoutfs_client_destroy(struct super_block *sb)
 						 client_farewell_response,
 						 NULL, NULL);
 		if (ret == 0) {
-			wait_for_completion(&client->farewell_comp);
-			ret = client->farewell_error;
+			ret = wait_for_completion_interruptible(
+							&client->farewell_comp);
+			if (ret == 0)
+				ret = client->farewell_error;
 		}
 		if (ret) {
 			scoutfs_inc_counter(sb, client_farewell_error);
@@ -669,11 +553,3 @@ void scoutfs_client_destroy(struct super_block *sb)
 	kfree(client);
 	sbi->client_info = NULL;
 }
-
-void scoutfs_client_net_shutdown(struct super_block *sb)
-{
-	struct client_info *client = SCOUTFS_SB(sb)->client_info;
-
-	if (client && client->conn)
-		scoutfs_net_shutdown(sb, client->conn);
-}

kmod/src/client.h

@@ -10,6 +10,7 @@ int scoutfs_client_commit_log_trees(struct super_block *sb,
 int scoutfs_client_get_roots(struct super_block *sb,
 			     struct scoutfs_net_roots *roots);
 u64 *scoutfs_client_bulk_alloc(struct super_block *sb);
+int scoutfs_client_advance_seq(struct super_block *sb, u64 *seq);
 int scoutfs_client_get_last_seq(struct super_block *sb, u64 *seq);
 int scoutfs_client_lock_request(struct super_block *sb,
 				struct scoutfs_net_lock *nl);
@@ -21,21 +22,7 @@ int scoutfs_client_srch_get_compact(struct super_block *sb,
 				    struct scoutfs_srch_compact *sc);
 int scoutfs_client_srch_commit_compact(struct super_block *sb,
 				       struct scoutfs_srch_compact *res);
-int scoutfs_client_get_log_merge(struct super_block *sb,
-				 struct scoutfs_log_merge_request *req);
-int scoutfs_client_commit_log_merge(struct super_block *sb,
-				    struct scoutfs_log_merge_complete *comp);
-int scoutfs_client_send_omap_response(struct super_block *sb, u64 id,
-				      struct scoutfs_open_ino_map *map);
-int scoutfs_client_open_ino_map(struct super_block *sb, u64 group_nr,
-				struct scoutfs_open_ino_map *map);
-int scoutfs_client_get_volopt(struct super_block *sb, struct scoutfs_volume_options *volopt);
-int scoutfs_client_set_volopt(struct super_block *sb, struct scoutfs_volume_options *volopt);
-int scoutfs_client_clear_volopt(struct super_block *sb, struct scoutfs_volume_options *volopt);
-int scoutfs_client_resize_devices(struct super_block *sb, struct scoutfs_net_resize_devices *nrd);
-int scoutfs_client_statfs(struct super_block *sb, struct scoutfs_net_statfs *nst);
 
-void scoutfs_client_net_shutdown(struct super_block *sb);
 int scoutfs_client_setup(struct super_block *sb);
 void scoutfs_client_destroy(struct super_block *sb);
 

kmod/src/counters.h

@@ -30,13 +30,11 @@
 	EXPAND_COUNTER(block_cache_free)			\
 	EXPAND_COUNTER(block_cache_free_work)			\
 	EXPAND_COUNTER(block_cache_remove_stale)		\
-	EXPAND_COUNTER(block_cache_count_objects)		\
-	EXPAND_COUNTER(block_cache_scan_objects)		\
 	EXPAND_COUNTER(block_cache_shrink)			\
 	EXPAND_COUNTER(block_cache_shrink_next)			\
 	EXPAND_COUNTER(block_cache_shrink_recent)		\
 	EXPAND_COUNTER(block_cache_shrink_remove)		\
-	EXPAND_COUNTER(block_cache_shrink_stop)			\
+	EXPAND_COUNTER(block_cache_shrink_restart)		\
 	EXPAND_COUNTER(btree_compact_values)			\
 	EXPAND_COUNTER(btree_compact_values_enomem)		\
 	EXPAND_COUNTER(btree_delete)				\
@@ -46,16 +44,6 @@
 	EXPAND_COUNTER(btree_insert)				\
 	EXPAND_COUNTER(btree_leaf_item_hash_search)		\
 	EXPAND_COUNTER(btree_lookup)				\
-	EXPAND_COUNTER(btree_merge)				\
-	EXPAND_COUNTER(btree_merge_alloc_low)			\
-	EXPAND_COUNTER(btree_merge_delete)			\
-	EXPAND_COUNTER(btree_merge_delta_combined)		\
-	EXPAND_COUNTER(btree_merge_delta_null)			\
-	EXPAND_COUNTER(btree_merge_dirty_limit)			\
-	EXPAND_COUNTER(btree_merge_drop_old)			\
-	EXPAND_COUNTER(btree_merge_insert)			\
-	EXPAND_COUNTER(btree_merge_update)			\
-	EXPAND_COUNTER(btree_merge_walk)			\
 	EXPAND_COUNTER(btree_next)				\
 	EXPAND_COUNTER(btree_prev)				\
 	EXPAND_COUNTER(btree_split)				\
@@ -77,6 +65,8 @@
 	EXPAND_COUNTER(data_write_begin_enobufs_retry)		\
 	EXPAND_COUNTER(dentry_revalidate_error)			\
 	EXPAND_COUNTER(dentry_revalidate_invalid)		\
+	EXPAND_COUNTER(dentry_revalidate_locked)		\
+	EXPAND_COUNTER(dentry_revalidate_orphan)		\
 	EXPAND_COUNTER(dentry_revalidate_rcu)			\
 	EXPAND_COUNTER(dentry_revalidate_root)			\
 	EXPAND_COUNTER(dentry_revalidate_valid)			\
@@ -90,13 +80,9 @@
 	EXPAND_COUNTER(forest_read_items)			\
 	EXPAND_COUNTER(forest_roots_next_hint)			\
 	EXPAND_COUNTER(forest_set_bloom_bits)			\
-	EXPAND_COUNTER(item_cache_count_objects)		\
-	EXPAND_COUNTER(item_cache_scan_objects)			\
 	EXPAND_COUNTER(item_clear_dirty)			\
 	EXPAND_COUNTER(item_create)				\
 	EXPAND_COUNTER(item_delete)				\
-	EXPAND_COUNTER(item_delta)				\
-	EXPAND_COUNTER(item_delta_written)			\
 	EXPAND_COUNTER(item_dirty)				\
 	EXPAND_COUNTER(item_invalidate)				\
 	EXPAND_COUNTER(item_invalidate_page)			\
@@ -125,10 +111,13 @@
 	EXPAND_COUNTER(item_update)				\
 	EXPAND_COUNTER(item_write_dirty)			\
 	EXPAND_COUNTER(lock_alloc)				\
-	EXPAND_COUNTER(lock_count_objects)			\
 	EXPAND_COUNTER(lock_free)				\
+	EXPAND_COUNTER(lock_grace_extended)			\
+	EXPAND_COUNTER(lock_grace_set)				\
+	EXPAND_COUNTER(lock_grace_wait)				\
 	EXPAND_COUNTER(lock_grant_request)			\
 	EXPAND_COUNTER(lock_grant_response)			\
+	EXPAND_COUNTER(lock_grant_work)				\
 	EXPAND_COUNTER(lock_invalidate_coverage)		\
 	EXPAND_COUNTER(lock_invalidate_inode)			\
 	EXPAND_COUNTER(lock_invalidate_request)			\
@@ -139,7 +128,6 @@
 	EXPAND_COUNTER(lock_lock_error)				\
 	EXPAND_COUNTER(lock_nonblock_eagain)			\
 	EXPAND_COUNTER(lock_recover_request)			\
-	EXPAND_COUNTER(lock_scan_objects)			\
 	EXPAND_COUNTER(lock_shrink_attempted)			\
 	EXPAND_COUNTER(lock_shrink_aborted)			\
 	EXPAND_COUNTER(lock_shrink_work)			\
@@ -155,13 +143,6 @@
 	EXPAND_COUNTER(net_recv_invalid_message)		\
 	EXPAND_COUNTER(net_recv_messages)			\
 	EXPAND_COUNTER(net_unknown_request)			\
-	EXPAND_COUNTER(orphan_scan)				\
-	EXPAND_COUNTER(orphan_scan_attempts)			\
-	EXPAND_COUNTER(orphan_scan_cached)			\
-	EXPAND_COUNTER(orphan_scan_error)			\
-	EXPAND_COUNTER(orphan_scan_item)			\
-	EXPAND_COUNTER(orphan_scan_omap_set)			\
-	EXPAND_COUNTER(quorum_candidate_server_stopping)	\
 	EXPAND_COUNTER(quorum_elected)				\
 	EXPAND_COUNTER(quorum_fence_error)			\
 	EXPAND_COUNTER(quorum_fence_leader)			\
@@ -172,7 +153,6 @@
 	EXPAND_COUNTER(quorum_recv_resignation)			\
 	EXPAND_COUNTER(quorum_recv_vote)			\
 	EXPAND_COUNTER(quorum_send_heartbeat)			\
-	EXPAND_COUNTER(quorum_send_heartbeat_dropped)		\
 	EXPAND_COUNTER(quorum_send_resignation)			\
 	EXPAND_COUNTER(quorum_send_request)			\
 	EXPAND_COUNTER(quorum_send_vote)			\
@@ -184,7 +164,6 @@
 	EXPAND_COUNTER(srch_add_entry)				\
 	EXPAND_COUNTER(srch_compact_dirty_block)		\
 	EXPAND_COUNTER(srch_compact_entry)			\
-	EXPAND_COUNTER(srch_compact_error)			\
 	EXPAND_COUNTER(srch_compact_flush)			\
 	EXPAND_COUNTER(srch_compact_log_page)			\
 	EXPAND_COUNTER(srch_compact_removed_entry)		\
@@ -194,14 +173,11 @@
 	EXPAND_COUNTER(srch_search_retry_empty)			\
 	EXPAND_COUNTER(srch_search_sorted)			\
 	EXPAND_COUNTER(srch_search_sorted_block)		\
+	EXPAND_COUNTER(srch_search_stale_eio)			\
+	EXPAND_COUNTER(srch_search_stale_retry)			\
 	EXPAND_COUNTER(srch_search_xattrs)			\
 	EXPAND_COUNTER(srch_read_stale)				\
 	EXPAND_COUNTER(statfs)					\
-	EXPAND_COUNTER(totl_read_copied)			\
-	EXPAND_COUNTER(totl_read_finalized)			\
-	EXPAND_COUNTER(totl_read_fs)				\
-	EXPAND_COUNTER(totl_read_item)				\
-	EXPAND_COUNTER(totl_read_logged)			\
 	EXPAND_COUNTER(trans_commit_data_alloc_low)		\
 	EXPAND_COUNTER(trans_commit_dirty_meta_full)		\
 	EXPAND_COUNTER(trans_commit_fsync)			\
@@ -238,12 +214,12 @@ struct scoutfs_counters {
 #define SCOUTFS_PCPU_COUNTER_BATCH (1 << 30)
 
 #define scoutfs_inc_counter(sb, which)					\
-	percpu_counter_add_batch(&SCOUTFS_SB(sb)->counters->which, 1,	\
-				 SCOUTFS_PCPU_COUNTER_BATCH)
+	__percpu_counter_add(&SCOUTFS_SB(sb)->counters->which, 1,	\
+			     SCOUTFS_PCPU_COUNTER_BATCH)
 
 #define scoutfs_add_counter(sb, which, cnt)				\
-	percpu_counter_add_batch(&SCOUTFS_SB(sb)->counters->which, cnt,	\
-				 SCOUTFS_PCPU_COUNTER_BATCH)
+	__percpu_counter_add(&SCOUTFS_SB(sb)->counters->which, cnt,	\
+			     SCOUTFS_PCPU_COUNTER_BATCH)
 
 void __init scoutfs_init_counters(void);
 int scoutfs_setup_counters(struct super_block *sb);

kmod/src/data.c

@@ -207,7 +207,6 @@ static s64 truncate_extents(struct super_block *sb, struct inode *inode,
 	u64 offset;
 	s64 ret;
 	u8 flags;
-	int err;
 	int i;
 
 	flags = offline ? SEF_OFFLINE : 0;
@@ -247,18 +246,6 @@ static s64 truncate_extents(struct super_block *sb, struct inode *inode,
 		tr.len = min(ext.len - offset, last - iblock + 1);
 		tr.flags = ext.flags;
 
-		trace_scoutfs_data_extent_truncated(sb, ino, &tr);
-
-		ret = scoutfs_ext_set(sb, &data_ext_ops, &args,
-				      tr.start, tr.len, 0, flags);
-		if (ret < 0) {
-			if (WARN_ON_ONCE(ret == -EINVAL)) {
-				scoutfs_err(sb, "unexpected truncate inconsistency: ino %llu iblock %llu last %llu, start %llu len %llu",
-					    ino, iblock, last, tr.start, tr.len);
-			}
-			break;
-		}
-
 		if (tr.map) {
 			mutex_lock(&datinf->mutex);
 			ret = scoutfs_free_data(sb, datinf->alloc,
@@ -266,16 +253,16 @@ static s64 truncate_extents(struct super_block *sb, struct inode *inode,
 						&datinf->data_freed,
 						tr.map, tr.len);
 			mutex_unlock(&datinf->mutex);
-			if (ret < 0) {
-				err = scoutfs_ext_set(sb, &data_ext_ops, &args,
-						      tr.start, tr.len, tr.map, tr.flags);
-				if (err < 0)
-					scoutfs_err(sb, "truncate err %d restoring extent after error %lld: ino %llu start %llu len %llu",
-						    err, ret, ino, tr.start, tr.len);
+			if (ret < 0)
 				break;
-			}
 		}
 
+		trace_scoutfs_data_extent_truncated(sb, ino, &tr);
+
+		ret = scoutfs_ext_set(sb, &data_ext_ops, &args,
+				      tr.start, tr.len, 0, flags);
+		BUG_ON(ret);  /* inconsistent, could prealloc items */
+
 		iblock += tr.len;
 	}
 
@@ -307,7 +294,7 @@ int scoutfs_data_truncate_items(struct super_block *sb, struct inode *inode,
 	LIST_HEAD(ind_locks);
 	s64 ret = 0;
 
-	WARN_ON_ONCE(inode && !inode_is_locked(inode));
+	WARN_ON_ONCE(inode && !mutex_is_locked(&inode->i_mutex));
 
 	/* clamp last to the last possible block? */
 	if (last > SCOUTFS_BLOCK_SM_MAX)
@@ -325,9 +312,10 @@ int scoutfs_data_truncate_items(struct super_block *sb, struct inode *inode,
 
 	while (iblock <= last) {
 		if (inode)
-			ret = scoutfs_inode_index_lock_hold(inode, &ind_locks, true, false);
+			ret = scoutfs_inode_index_lock_hold(inode, &ind_locks,
+							    true);
 		else
-			ret = scoutfs_hold_trans(sb, false);
+			ret = scoutfs_hold_trans(sb);
 		if (ret)
 			break;
 
@@ -366,27 +354,27 @@ static inline u64 ext_last(struct scoutfs_extent *ext)
 
 /*
  * The caller is writing to a logical iblock that doesn't have an
- * allocated extent.  The caller has searched for an extent containing
- * iblock.  If it already existed then it must be unallocated and
- * offline.
+ * allocated extent.
  *
- * We implement two preallocation strategies.  Typically we only
- * preallocate for simple streaming writes and limit preallocation while
- * the file is small.   The largest efficient allocation size is
- * typically large enough that it would be unreasonable to allocate that
- * much for all small files.
+ * We always allocate an extent starting at the logical iblock.  The
+ * caller has searched for an extent containing iblock.  If it already
+ * existed then it must be unallocated and offline.
  *
- * Optionally, we can simply preallocate large empty aligned regions.
- * This can waste a lot of space for small or sparse files but is
- * reasonable when a file population is known to be large and dense but
- * known to be written with non-streaming write patterns.
+ * Preallocation is used if we're strictly contiguously extending
+ * writes.  That is, if the logical block offset equals the number of
+ * online blocks.  We try to preallocate the number of blocks existing
+ * so that small files don't waste inordinate amounts of space and large
+ * files will eventually see large extents.  This only works for
+ * contiguous single stream writes or stages of files from the first
+ * block.  It doesn't work for concurrent stages, releasing behind
+ * staging, sparse files, multi-node writes, etc.  fallocate() is always
+ * a better tool to use.
  */
 static int alloc_block(struct super_block *sb, struct inode *inode,
 		       struct scoutfs_extent *ext, u64 iblock,
 		       struct scoutfs_lock *lock)
 {
 	DECLARE_DATA_INFO(sb, datinf);
-	struct scoutfs_mount_options opts;
 	const u64 ino = scoutfs_ino(inode);
 	struct data_ext_args args = {
 		.ino = ino,
@@ -394,22 +382,17 @@ static int alloc_block(struct super_block *sb, struct inode *inode,
 		.lock = lock,
 	};
 	struct scoutfs_extent found;
-	struct scoutfs_extent pre = {0,};
-	bool undo_pre = false;
+	struct scoutfs_extent pre;
 	u64 blkno = 0;
 	u64 online;
 	u64 offline;
 	u8 flags;
-	u64 start;
 	u64 count;
-	u64 rem;
 	int ret;
 	int err;
 
 	trace_scoutfs_data_alloc_block_enter(sb, ino, iblock, ext);
 
-	scoutfs_options_read(sb, &opts);
-
 	/* can only allocate over existing unallocated offline extent */
 	if (WARN_ON_ONCE(ext->len &&
 			 !(iblock >= ext->start && iblock <= ext_last(ext) &&
@@ -418,118 +401,66 @@ static int alloc_block(struct super_block *sb, struct inode *inode,
 
 	mutex_lock(&datinf->mutex);
 
-	/* default to single allocation at the written block */
-	start = iblock;
-	count = 1;
-	/* copy existing flags for preallocated regions */
-	flags = ext->len ? ext->flags : 0;
+	scoutfs_inode_get_onoff(inode, &online, &offline);
 
 	if (ext->len) {
-		/*
-		 * Assume that offline writers are going to be writing
-		 * all the offline extents and try to preallocate the
-		 * rest of the unwritten extent.
-		 */
+		/* limit preallocation to remaining existing (offline) extent */
 		count = ext->len - (iblock - ext->start);
-
-	} else if (opts.data_prealloc_contig_only) {
-		/*
-		 * Only preallocate when a quick test of the online
-		 * block counts looks like we're a simple streaming
-		 * write.  Try to write until the next extent but limit
-		 * the preallocation size to the number of online
-		 * blocks.
-		 */
-		scoutfs_inode_get_onoff(inode, &online, &offline);
-		if (iblock > 1 && iblock == online) {
-			ret = scoutfs_ext_next(sb, &data_ext_ops, &args,
-					       iblock, 1, &found);
-			if (ret < 0 && ret != -ENOENT)
-				goto out;
-			if (found.len && found.start > iblock)
-				count = found.start - iblock;
-			else
-				count = opts.data_prealloc_blocks;
-
-			count = min(iblock, count);
-		}
-
+		flags = ext->flags;
 	} else {
-		/*
-		 * Preallocation within aligned regions tries to
-		 * allocate an extent to fill the hole in the region
-		 * that contains iblock.  We'd have to add a bit of plumbing
-		 * to find previous extents so we only search for a next
-		 * extent from the front of the region and from iblock.
-		 */
-		div64_u64_rem(iblock, opts.data_prealloc_blocks, &rem);
-		start = iblock - rem;
-		count = opts.data_prealloc_blocks;
-		ret = scoutfs_ext_next(sb, &data_ext_ops, &args, start, 1, &found);
+		/* otherwise alloc to next extent */
+		ret = scoutfs_ext_next(sb, &data_ext_ops, &args,
+				       iblock, 1, &found);
 		if (ret < 0 && ret != -ENOENT)
 			goto out;
-
-		/* trim count if there's an extent in the region before iblock */
-		if (found.len && found.start < iblock) {
-			count -= iblock - start;
-			start = iblock;
-			/* see if there's also an extent after iblock */
-			ret = scoutfs_ext_next(sb, &data_ext_ops, &args, iblock, 1, &found);
-			if (ret < 0 && ret != -ENOENT)
-				goto out;
-		}
-
-		/* trim count by next extent after iblock */
-		if (found.len && found.start > start && found.start < start + count)
-			count = (found.start - start);
+		if (found.len && found.start > iblock)
+			count = found.start - iblock;
+		else
+			count = SCOUTFS_DATA_EXTEND_PREALLOC_LIMIT;
+		flags = 0;
 	}
 
 	/* overall prealloc limit */
-	count = min_t(u64, count, opts.data_prealloc_blocks);
+	count = min_t(u64, count, SCOUTFS_DATA_EXTEND_PREALLOC_LIMIT);
+
+	/* only strictly contiguous extending writes will try to preallocate */
+	if (iblock > 1 && iblock == online)
+		count = min(iblock, count);
+	else
+		count = 1;
 
 	ret = scoutfs_alloc_data(sb, datinf->alloc, datinf->wri,
 				 &datinf->dalloc, count, &blkno, &count);
 	if (ret < 0)
 		goto out;
 
-	/*
-	 * An aligned prealloc attempt that gets a smaller extent can
-	 * fail to cover iblock, make sure that it does.  This is a
-	 * pathological case so we don't try to move the window past
-	 * iblock.  Just enough to cover it, which we know is safe.
-	 */
-	if (start + count <= iblock)
-		start += (iblock - (start + count) + 1);
+	ret = scoutfs_ext_set(sb, &data_ext_ops, &args, iblock, 1, blkno, 0);
+	if (ret < 0)
+		goto out;
 
 	if (count > 1) {
-		pre.start = start;
-		pre.len = count;
-		pre.map = blkno;
+		pre.start = iblock + 1;
+		pre.len = count - 1;
+		pre.map = blkno + 1;
 		pre.flags = flags | SEF_UNWRITTEN;
 		ret = scoutfs_ext_set(sb, &data_ext_ops, &args, pre.start,
 				      pre.len, pre.map, pre.flags);
-		if (ret < 0)
+		if (ret < 0) {
+			err = scoutfs_ext_set(sb, &data_ext_ops, &args, iblock,
+					      1, 0, flags);
+			BUG_ON(err); /* couldn't restore original */
 			goto out;
-		undo_pre = true;
+		}
 	}
 
-	ret = scoutfs_ext_set(sb, &data_ext_ops, &args, iblock, 1, blkno + (iblock - start), 0);
-	if (ret < 0)
-		goto out;
-
 	/* tell the caller we have a single block, could check next? */
 	ext->start = iblock;
 	ext->len = 1;
-	ext->map = blkno + (iblock - start);
+	ext->map = blkno;
 	ext->flags = 0;
 	ret = 0;
 out:
 	if (ret < 0 && blkno > 0) {
-		if (undo_pre) {
-			err = scoutfs_ext_set(sb, &data_ext_ops, &args,
-					      pre.start, pre.len, 0, flags);
-			BUG_ON(err); /* leaked preallocated extent */
-		}
 		err = scoutfs_free_data(sb, datinf->alloc, datinf->wri,
 				        &datinf->data_freed, blkno, count);
 		BUG_ON(err); /* leaked free blocks */
@@ -558,7 +489,7 @@ static int scoutfs_get_block(struct inode *inode, sector_t iblock,
 	u64 offset;
 	int ret;
 
-	WARN_ON_ONCE(create && !inode_is_locked(inode));
+	WARN_ON_ONCE(create && !mutex_is_locked(&inode->i_mutex));
 
 	/* make sure caller holds a cluster lock */
 	lock = scoutfs_per_task_get(&si->pt_data_lock);
@@ -643,8 +574,8 @@ static int scoutfs_get_block_read(struct inode *inode, sector_t iblock,
 	return ret;
 }
 
-int scoutfs_get_block_write(struct inode *inode, sector_t iblock, struct buffer_head *bh,
-			    int create)
+static int scoutfs_get_block_write(struct inode *inode, sector_t iblock,
+				   struct buffer_head *bh, int create)
 {
 	struct scoutfs_inode_info *si = SCOUTFS_I(inode);
 	int ret;
@@ -704,7 +635,7 @@ static int scoutfs_readpage(struct file *file, struct page *page)
 
 	if (scoutfs_per_task_add_excl(&si->pt_data_lock, &pt_ent, inode_lock)) {
 		ret = scoutfs_data_wait_check(inode, page_offset(page),
-					      PAGE_SIZE, SEF_OFFLINE,
+					      PAGE_CACHE_SIZE, SEF_OFFLINE,
 					      SCOUTFS_IOC_DWO_READ, &dw,
 					      inode_lock);
 		if (ret != 0) {
@@ -729,7 +660,6 @@ static int scoutfs_readpage(struct file *file, struct page *page)
 	return ret;
 }
 
-#ifndef KC_FILE_AOPS_READAHEAD
 /*
  * This is used for opportunistic read-ahead which can throw the pages
  * away if it needs to.  If the caller didn't deal with offline extents
@@ -755,14 +685,14 @@ static int scoutfs_readpages(struct file *file, struct address_space *mapping,
 
 	list_for_each_entry_safe(page, tmp, pages, lru) {
 		ret = scoutfs_data_wait_check(inode, page_offset(page),
-					      PAGE_SIZE, SEF_OFFLINE,
+					      PAGE_CACHE_SIZE, SEF_OFFLINE,
 					      SCOUTFS_IOC_DWO_READ, NULL,
 					      inode_lock);
 		if (ret < 0)
 			goto out;
 		if (ret > 0) {
 			list_del(&page->lru);
-			put_page(page);
+			page_cache_release(page);
 			if (--nr_pages == 0) {
 				ret = 0;
 				goto out;
@@ -776,29 +706,6 @@ out:
 	BUG_ON(!list_empty(pages));
 	return ret;
 }
-#else
-static void scoutfs_readahead(struct readahead_control *rac)
-{
-	struct inode *inode = rac->file->f_inode;
-	struct super_block *sb = inode->i_sb;
-	struct scoutfs_lock *inode_lock = NULL;
-	int ret;
-
-	ret = scoutfs_lock_inode(sb, SCOUTFS_LOCK_READ,
-				 SCOUTFS_LKF_REFRESH_INODE, inode, &inode_lock);
-	if (ret)
-		return;
-
-	ret = scoutfs_data_wait_check(inode, readahead_pos(rac),
-				      readahead_length(rac), SEF_OFFLINE,
-				      SCOUTFS_IOC_DWO_READ, NULL,
-				      inode_lock);
-	if (ret == 0)
-		mpage_readahead(rac, scoutfs_get_block_read);
-
-	scoutfs_unlock(sb, inode_lock, SCOUTFS_LOCK_READ);
-}
-#endif
 
 static int scoutfs_writepage(struct page *page, struct writeback_control *wbc)
 {
@@ -849,7 +756,8 @@ retry:
 		ret = scoutfs_inode_index_start(sb, &ind_seq) ?:
 		      scoutfs_inode_index_prepare(sb, &wbd->ind_locks, inode,
 						  true) ?:
-		      scoutfs_inode_index_try_lock_hold(sb, &wbd->ind_locks, ind_seq, true);
+		      scoutfs_inode_index_try_lock_hold(sb, &wbd->ind_locks,
+							ind_seq);
 	} while (ret > 0);
 	if (ret < 0)
 		goto out;
@@ -911,7 +819,6 @@ static int scoutfs_write_end(struct file *file, struct address_space *mapping,
 			scoutfs_inode_inc_data_version(inode);
 		}
 
-		inode_inc_iversion(inode);
 		scoutfs_update_inode_item(inode, wbd->lock, &wbd->ind_locks);
 		scoutfs_inode_queue_writeback(inode);
 	}
@@ -1064,6 +971,9 @@ long scoutfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
 	u64 last;
 	s64 ret;
 
+	mutex_lock(&inode->i_mutex);
+	down_write(&si->extent_sem);
+
 	/* XXX support more flags */
         if (mode & ~(FALLOC_FL_KEEP_SIZE)) {
 		ret = -EOPNOTSUPP;
@@ -1081,22 +991,18 @@ long scoutfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
 		goto out;
 	}
 
-	inode_lock(inode);
-
 	ret = scoutfs_lock_inode(sb, SCOUTFS_LOCK_WRITE,
 				 SCOUTFS_LKF_REFRESH_INODE, inode, &lock);
 	if (ret)
-		goto out_mutex;
+		goto out;
 
 	inode_dio_wait(inode);
 
-	down_write(&si->extent_sem);
-
 	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
 	    (offset + len > i_size_read(inode))) {
                 ret = inode_newsize_ok(inode, offset + len);
                 if (ret)
-                        goto out_extent;
+                        goto out;
         }
 
 	iblock = offset >> SCOUTFS_BLOCK_SM_SHIFT;
@@ -1104,9 +1010,9 @@ long scoutfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
 
 	while(iblock <= last) {
 
-		ret = scoutfs_inode_index_lock_hold(inode, &ind_locks, false, true);
+		ret = scoutfs_inode_index_lock_hold(inode, &ind_locks, false);
 		if (ret)
-			goto out_extent;
+			goto out;
 
 		ret = fallocate_extents(sb, inode, iblock, last, lock);
 
@@ -1114,11 +1020,8 @@ long scoutfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
 			end = (iblock + ret) << SCOUTFS_BLOCK_SM_SHIFT;
 			if (end > offset + len)
 				end = offset + len;
-			if (end > i_size_read(inode)) {
+			if (end > i_size_read(inode))
 				i_size_write(inode, end);
-				inode_inc_iversion(inode);
-				scoutfs_inode_inc_data_version(inode);
-			}
 		}
 		if (ret >= 0)
 			scoutfs_update_inode_item(inode, lock, &ind_locks);
@@ -1132,19 +1035,17 @@ long scoutfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
 		}
 
 		if (ret <= 0)
-			goto out_extent;
+			goto out;
 
 		iblock += ret;
 		ret = 0;
 	}
 
-out_extent:
-	up_write(&si->extent_sem);
-out_mutex:
-	scoutfs_unlock(sb, lock, SCOUTFS_LOCK_WRITE);
-	inode_unlock(inode);
-
 out:
+	scoutfs_unlock(sb, lock, SCOUTFS_LOCK_WRITE);
+	up_write(&si->extent_sem);
+	mutex_unlock(&inode->i_mutex);
+
 	trace_scoutfs_data_fallocate(sb, ino, mode, offset, len, ret);
 	return ret;
 }
@@ -1185,7 +1086,7 @@ int scoutfs_data_init_offline_extent(struct inode *inode, u64 size,
 	}
 
 	/* we're updating meta_seq with offline block count */
-	ret = scoutfs_inode_index_lock_hold(inode, &ind_locks, false, true);
+	ret = scoutfs_inode_index_lock_hold(inode, &ind_locks, false);
 	if (ret < 0)
 		goto out;
 
@@ -1228,14 +1129,13 @@ static void truncate_inode_pages_extent(struct inode *inode, u64 start, u64 len)
  * explained above the move_blocks ioctl argument structure definition.
  *
  * The caller has processed the ioctl args and performed the most basic
- * argument sanity and inode checks, but we perform more detailed inode
- * checks once we have the inode lock and refreshed inodes.  Our job is
- * to safely lock the two files and move the extents.
+ * inode checks, but we perform more detailed inode checks once we have
+ * the inode lock and refreshed inodes.  Our job is to safely lock the
+ * two files and move the extents.
  */
 #define MOVE_DATA_EXTENTS_PER_HOLD 16
 int scoutfs_data_move_blocks(struct inode *from, u64 from_off,
-			     u64 byte_len, struct inode *to, u64 to_off, bool is_stage,
-			     u64 data_version)
+			     u64 byte_len, struct inode *to, u64 to_off)
 {
 	struct scoutfs_inode_info *from_si = SCOUTFS_I(from);
 	struct scoutfs_inode_info *to_si = SCOUTFS_I(to);
@@ -1245,7 +1145,6 @@ int scoutfs_data_move_blocks(struct inode *from, u64 from_off,
 	struct data_ext_args from_args;
 	struct data_ext_args to_args;
 	struct scoutfs_extent ext;
-	struct kc_timespec cur_time;
 	LIST_HEAD(locks);
 	bool done = false;
 	loff_t from_size;
@@ -1281,24 +1180,9 @@ int scoutfs_data_move_blocks(struct inode *from, u64 from_off,
 		goto out;
 	}
 
-	if (is_stage && (data_version != SCOUTFS_I(to)->data_version)) {
-		ret = -ESTALE;
-		goto out;
-	}
-
 	from_iblock = from_off >> SCOUTFS_BLOCK_SM_SHIFT;
 	count = (byte_len + SCOUTFS_BLOCK_SM_MASK) >> SCOUTFS_BLOCK_SM_SHIFT;
 	to_iblock = to_off >> SCOUTFS_BLOCK_SM_SHIFT;
-	from_start = from_iblock;
-
-	/* only move extent blocks inside i_size, careful not to wrap */
-	from_size = i_size_read(from);
-	if (from_off >= from_size) {
-		ret = 0;
-		goto out;
-	}
-	if (from_off + byte_len > from_size)
-		count = ((from_size - from_off) + SCOUTFS_BLOCK_SM_MASK) >> SCOUTFS_BLOCK_SM_SHIFT;
 
 	if (S_ISDIR(from->i_mode) || S_ISDIR(to->i_mode)) {
 		ret = -EISDIR;
@@ -1318,7 +1202,7 @@ int scoutfs_data_move_blocks(struct inode *from, u64 from_off,
 	/* can't stage once data_version changes */
 	scoutfs_inode_get_onoff(from, &junk, &from_offline);
 	scoutfs_inode_get_onoff(to, &junk, &to_offline);
-	if (from_offline || (to_offline && !is_stage)) {
+	if (from_offline || to_offline) {
 		ret = -ENODATA;
 		goto out;
 	}
@@ -1347,7 +1231,7 @@ int scoutfs_data_move_blocks(struct inode *from, u64 from_off,
 		ret = scoutfs_inode_index_start(sb, &seq) ?:
 		      scoutfs_inode_index_prepare(sb, &locks, from, true) ?:
 		      scoutfs_inode_index_prepare(sb, &locks, to, true) ?:
-		      scoutfs_inode_index_try_lock_hold(sb, &locks, seq, false);
+		      scoutfs_inode_index_try_lock_hold(sb, &locks, seq);
 		if (ret > 0)
 			continue;
 		if (ret < 0)
@@ -1362,11 +1246,9 @@ int scoutfs_data_move_blocks(struct inode *from, u64 from_off,
 
 		/* arbitrarily limit the number of extents per trans hold */
 		for (i = 0; i < MOVE_DATA_EXTENTS_PER_HOLD; i++) {
-			struct scoutfs_extent off_ext;
-
 			/* find the next extent to move */
 			ret = scoutfs_ext_next(sb, &data_ext_ops, &from_args,
-					       from_start, 1, &ext);
+					       from_iblock, 1, &ext);
 			if (ret < 0) {
 				if (ret == -ENOENT) {
 					done = true;
@@ -1375,8 +1257,9 @@ int scoutfs_data_move_blocks(struct inode *from, u64 from_off,
 				break;
 			}
 
-			/* done if next extent starts after moving region */
-			if (ext.start >= from_iblock + count) {
+			/* only move extents within count and i_size */
+			if (ext.start >= from_iblock + count ||
+			    ext.start >= i_size_read(from)) {
 				done = true;
 				ret = 0;
 				break;
@@ -1384,36 +1267,17 @@ int scoutfs_data_move_blocks(struct inode *from, u64 from_off,
 
 			from_start = max(ext.start, from_iblock);
 			map = ext.map + (from_start - ext.start);
-			len = min(from_iblock + count, ext.start + ext.len) - from_start;
+			len = min3(from_iblock + count,
+				   round_up((u64)i_size_read(from),
+					    SCOUTFS_BLOCK_SM_SIZE),
+				   ext.start + ext.len) - from_start;
+
 			to_start = to_iblock + (from_start - from_iblock);
 
-			/* we'd get stuck, shouldn't happen */
-			if (WARN_ON_ONCE(len == 0)) {
-				ret = -EIO;
-				goto out;
-			}
-
-			if (is_stage) {
-				ret = scoutfs_ext_next(sb, &data_ext_ops, &to_args,
-						       to_start, 1, &off_ext);
-				if (ret)
-					break;
-
-				if (!scoutfs_ext_inside(to_start, len, &off_ext) ||
-				    !(off_ext.flags & SEF_OFFLINE)) {
-					ret = -EINVAL;
-					break;
-				}
-
-				ret = scoutfs_ext_set(sb, &data_ext_ops, &to_args,
-							 to_start, len,
-							 map, ext.flags);
-			} else {
-				/* insert the new, fails if it overlaps */
-				ret = scoutfs_ext_insert(sb, &data_ext_ops, &to_args,
-							 to_start, len,
-							 map, ext.flags);
-			}
+			/* insert the new, fails if it overlaps */
+			ret = scoutfs_ext_insert(sb, &data_ext_ops, &to_args,
+						 to_start, len,
+						 map, ext.flags);
 			if (ret < 0)
 				break;
 
@@ -1421,18 +1285,10 @@ int scoutfs_data_move_blocks(struct inode *from, u64 from_off,
 			ret = scoutfs_ext_set(sb, &data_ext_ops, &from_args,
 					      from_start, len, 0, 0);
 			if (ret < 0) {
-				if (is_stage) {
-					/* re-mark dest range as offline */
-					WARN_ON_ONCE(!(off_ext.flags & SEF_OFFLINE));
-					err = scoutfs_ext_set(sb, &data_ext_ops, &to_args,
-							      to_start, len,
-							      0, off_ext.flags);
-				} else {
-					/* remove inserted new on err */
-					err = scoutfs_ext_remove(sb, &data_ext_ops,
-								 &to_args, to_start,
-								 len);
-				}
+				/* remove inserted new on err */
+				err = scoutfs_ext_remove(sb, &data_ext_ops,
+							 &to_args, to_start,
+							 len);
 				BUG_ON(err); /* XXX inconsistent */
 				break;
 			}
@@ -1454,29 +1310,18 @@ int scoutfs_data_move_blocks(struct inode *from, u64 from_off,
 							i_size_read(from);
 				i_size_write(to, to_size);
 			}
-
-			/* find next after moved extent, avoiding wrapping */
-			if (from_start + len < from_start)
-				from_start = from_iblock + count + 1;
-			else
-				from_start += len;
 		}
 
 
 		up_write(&from_si->extent_sem);
 		up_write(&to_si->extent_sem);
 
-		cur_time = current_time(from);
-		if (!is_stage) {
-			to->i_ctime = to->i_mtime = cur_time;
-			inode_inc_iversion(to);
-			scoutfs_inode_inc_data_version(to);
-			scoutfs_inode_set_data_seq(to);
-		}
-		from->i_ctime = from->i_mtime = cur_time;
-		inode_inc_iversion(from);
+		from->i_ctime = from->i_mtime =
+			to->i_ctime = to->i_mtime = CURRENT_TIME;
 		scoutfs_inode_inc_data_version(from);
+		scoutfs_inode_inc_data_version(to);
 		scoutfs_inode_set_data_seq(from);
+		scoutfs_inode_set_data_seq(to);
 
 		scoutfs_update_inode_item(from, from_lock, &locks);
 		scoutfs_update_inode_item(to, to_lock, &locks);
@@ -1553,7 +1398,7 @@ int scoutfs_data_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 	if (ret)
 		goto out;
 
-	inode_lock(inode);
+	mutex_lock(&inode->i_mutex);
 	down_read(&si->extent_sem);
 
 	ret = scoutfs_lock_inode(sb, SCOUTFS_LOCK_READ, 0, inode, &lock);
@@ -1607,7 +1452,7 @@ int scoutfs_data_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 unlock:
 	scoutfs_unlock(sb, lock, SCOUTFS_LOCK_READ);
 	up_read(&si->extent_sem);
-	inode_unlock(inode);
+	mutex_unlock(&inode->i_mutex);
 
 out:
 	if (ret == 1)
@@ -1807,37 +1652,6 @@ int scoutfs_data_wait_check_iov(struct inode *inode, const struct iovec *iov,
 	return ret;
 }
 
-int scoutfs_data_wait_check_iter(struct inode *inode, loff_t pos, struct iov_iter *iter,
-				 u8 sef, u8 op, struct scoutfs_data_wait *dw,
-				 struct scoutfs_lock *lock)
-{
-	size_t count = iov_iter_count(iter);
-	size_t off = iter->iov_offset;
-	const struct iovec *iov;
-	size_t len;
-	int ret = 0;
-
-	for (iov = iter->iov; count > 0; iov++) {
-		len = iov->iov_len - off;
-		if (len == 0)
-			continue;
-
-		/* aren't we waiting on too much data here ? */
-		ret = scoutfs_data_wait_check(inode, pos, len,
-					      sef, op, dw, lock);
-
-		if (ret != 0)
-			break;
-
-
-		pos += len;
-		count -= len;
-		off = 0;
-	}
-
-	return ret;
-}
-
 int scoutfs_data_wait(struct inode *inode, struct scoutfs_data_wait *dw)
 {
 	DECLARE_DATA_WAIT_ROOT(inode->i_sb, rt);
@@ -1928,11 +1742,7 @@ int scoutfs_data_waiting(struct super_block *sb, u64 ino, u64 iblock,
 
 const struct address_space_operations scoutfs_file_aops = {
 	.readpage		= scoutfs_readpage,
-#ifndef KC_FILE_AOPS_READAHEAD
 	.readpages		= scoutfs_readpages,
-#else
-	.readahead		= scoutfs_readahead,
-#endif
 	.writepage		= scoutfs_writepage,
 	.writepages		= scoutfs_writepages,
 	.write_begin		= scoutfs_write_begin,
@@ -1940,15 +1750,10 @@ const struct address_space_operations scoutfs_file_aops = {
 };
 
 const struct file_operations scoutfs_file_fops = {
-#ifdef KC_LINUX_HAVE_FOP_AIO_READ
 	.read		= do_sync_read,
 	.write		= do_sync_write,
 	.aio_read	= scoutfs_file_aio_read,
 	.aio_write	= scoutfs_file_aio_write,
-#else
-	.read_iter	= scoutfs_file_read_iter,
-	.write_iter	= scoutfs_file_write_iter,
-#endif
 	.unlocked_ioctl	= scoutfs_ioctl,
 	.fsync		= scoutfs_file_fsync,
 	.llseek		= scoutfs_file_llseek,
@@ -2002,17 +1807,13 @@ int scoutfs_data_prepare_commit(struct super_block *sb)
 	return ret;
 }
 
-/*
- * Return true if the data allocator is lower than the caller's
- * requirement and we haven't been told by the server that we're out of
- * free extents.
- */
-bool scoutfs_data_alloc_should_refill(struct super_block *sb, u64 blocks)
+u64 scoutfs_data_alloc_free_bytes(struct super_block *sb)
 {
 	DECLARE_DATA_INFO(sb, datinf);
 
-	return (scoutfs_dalloc_total_len(&datinf->dalloc) < blocks) &&
-	       !(le32_to_cpu(datinf->dalloc.root.flags) & SCOUTFS_ALLOC_FLAG_LOW);
+	return scoutfs_dalloc_total_len(&datinf->dalloc) <<
+		SCOUTFS_BLOCK_SM_SHIFT;
+
 }
 
 int scoutfs_data_setup(struct super_block *sb)

kmod/src/data.h

@@ -38,14 +38,18 @@ struct scoutfs_data_wait {
 		.err = 0,						\
 	}
 
+struct scoutfs_traced_extent {
+	u64 iblock;
+	u64 count;
+	u64 blkno;
+	u8 flags;
+};
+
 extern const struct address_space_operations scoutfs_file_aops;
 extern const struct file_operations scoutfs_file_fops;
 struct scoutfs_alloc;
 struct scoutfs_block_writer;
 
-int scoutfs_get_block_write(struct inode *inode, sector_t iblock, struct buffer_head *bh,
-			    int create);
-
 int scoutfs_data_truncate_items(struct super_block *sb, struct inode *inode,
 				u64 ino, u64 iblock, u64 last, bool offline,
 				struct scoutfs_lock *lock);
@@ -55,8 +59,7 @@ long scoutfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len);
 int scoutfs_data_init_offline_extent(struct inode *inode, u64 size,
 				     struct scoutfs_lock *lock);
 int scoutfs_data_move_blocks(struct inode *from, u64 from_off,
-			     u64 byte_len, struct inode *to, u64 to_off, bool to_stage,
-			     u64 data_version);
+			     u64 byte_len, struct inode *to, u64 to_off);
 
 int scoutfs_data_wait_check(struct inode *inode, loff_t pos, loff_t len,
 			    u8 sef, u8 op, struct scoutfs_data_wait *ow,
@@ -65,9 +68,6 @@ int scoutfs_data_wait_check_iov(struct inode *inode, const struct iovec *iov,
 				unsigned long nr_segs, loff_t pos, u8 sef,
 				u8 op, struct scoutfs_data_wait *ow,
 				struct scoutfs_lock *lock);
-int scoutfs_data_wait_check_iter(struct inode *inode, loff_t pos, struct iov_iter *iter,
-				 u8 sef, u8 op, struct scoutfs_data_wait *ow,
-				 struct scoutfs_lock *lock);
 bool scoutfs_data_wait_found(struct scoutfs_data_wait *ow);
 int scoutfs_data_wait(struct inode *inode,
 			      struct scoutfs_data_wait *ow);
@@ -85,7 +85,7 @@ void scoutfs_data_init_btrees(struct super_block *sb,
 void scoutfs_data_get_btrees(struct super_block *sb,
 			     struct scoutfs_log_trees *lt);
 int scoutfs_data_prepare_commit(struct super_block *sb);
-bool scoutfs_data_alloc_should_refill(struct super_block *sb, u64 blocks);
+u64 scoutfs_data_alloc_free_bytes(struct super_block *sb);
 
 int scoutfs_data_setup(struct super_block *sb);
 void scoutfs_data_destroy(struct super_block *sb);

kmod/src/dir.h

@@ -5,24 +5,16 @@
 #include "lock.h"
 
 extern const struct file_operations scoutfs_dir_fops;
-#ifdef KC_LINUX_HAVE_RHEL_IOPS_WRAPPER
-extern const struct inode_operations_wrapper scoutfs_dir_iops;
-#else
 extern const struct inode_operations scoutfs_dir_iops;
-#endif
 extern const struct inode_operations scoutfs_symlink_iops;
 
-extern const struct dentry_operations scoutfs_dentry_ops;
-
 struct scoutfs_link_backref_entry {
 	struct list_head head;
 	u64 dir_ino;
 	u64 dir_pos;
 	u16 name_len;
-	u8 d_type;
-	bool last;
 	struct scoutfs_dirent dent;
-	/* the full name is allocated and stored in dent.name[] */
+	/* the full name is allocated and stored in dent.name[0] */
 };
 
 int scoutfs_dir_get_backref_path(struct super_block *sb, u64 ino, u64 dir_ino,
@@ -30,10 +22,14 @@ int scoutfs_dir_get_backref_path(struct super_block *sb, u64 ino, u64 dir_ino,
 void scoutfs_dir_free_backref_path(struct super_block *sb,
 				   struct list_head *list);
 
-int scoutfs_dir_add_next_linkrefs(struct super_block *sb, u64 ino, u64 dir_ino, u64 dir_pos,
-				  int count, struct list_head *list);
+int scoutfs_dir_add_next_linkref(struct super_block *sb, u64 ino,
+				 u64 dir_ino, u64 dir_pos,
+				 struct list_head *list);
 
 int scoutfs_symlink_drop(struct super_block *sb, u64 ino,
 			 struct scoutfs_lock *lock, u64 i_size);
 
+int scoutfs_dir_init(void);
+void scoutfs_dir_exit(void);
+
 #endif

kmod/src/export.c

@@ -81,7 +81,7 @@ static struct dentry *scoutfs_fh_to_dentry(struct super_block *sb,
 	trace_scoutfs_fh_to_dentry(sb, fh_type, sfid);
 
 	if (scoutfs_valid_fileid(fh_type))
-		inode = scoutfs_iget(sb, le64_to_cpu(sfid->ino), 0, SCOUTFS_IGF_LINKED);
+		inode = scoutfs_iget(sb, le64_to_cpu(sfid->ino));
 
 	return d_obtain_alias(inode);
 }
@@ -100,7 +100,7 @@ static struct dentry *scoutfs_fh_to_parent(struct super_block *sb,
 
 	if (scoutfs_valid_fileid(fh_type) &&
 	    fh_type == FILEID_SCOUTFS_WITH_PARENT)
-		inode = scoutfs_iget(sb, le64_to_cpu(sfid->parent_ino), 0, SCOUTFS_IGF_LINKED);
+		inode = scoutfs_iget(sb, le64_to_cpu(sfid->parent_ino));
 
 	return d_obtain_alias(inode);
 }
@@ -114,8 +114,8 @@ static struct dentry *scoutfs_get_parent(struct dentry *child)
 	int ret;
 	u64 ino;
 
-	ret = scoutfs_dir_add_next_linkrefs(sb, scoutfs_ino(inode), 0, 0, 1, &list);
-	if (ret < 0)
+	ret = scoutfs_dir_add_next_linkref(sb, scoutfs_ino(inode), 0, 0, &list);
+	if (ret)
 		return ERR_PTR(ret);
 
 	ent = list_first_entry(&list, struct scoutfs_link_backref_entry, head);
@@ -123,7 +123,7 @@ static struct dentry *scoutfs_get_parent(struct dentry *child)
 	scoutfs_dir_free_backref_path(sb, &list);
 	trace_scoutfs_get_parent(sb, inode, ino);
 
-	inode = scoutfs_iget(sb, ino, 0, SCOUTFS_IGF_LINKED);
+	inode = scoutfs_iget(sb, ino);
 
 	return d_obtain_alias(inode);
 }
@@ -138,9 +138,9 @@ static int scoutfs_get_name(struct dentry *parent, char *name,
 	LIST_HEAD(list);
 	int ret;
 
-	ret = scoutfs_dir_add_next_linkrefs(sb, scoutfs_ino(inode), dir_ino,
-					    0, 1, &list);
-	if (ret < 0)
+	ret = scoutfs_dir_add_next_linkref(sb, scoutfs_ino(inode), dir_ino,
+					   0, &list);
+	if (ret)
 		return ret;
 
 	ret = -ENOENT;

kmod/src/ext.c

@@ -13,7 +13,6 @@
 #include <linux/kernel.h>
 #include <linux/fs.h>
 
-#include "msg.h"
 #include "ext.h"
 #include "counters.h"
 #include "scoutfs_trace.h"
@@ -39,7 +38,7 @@ static bool ext_overlap(struct scoutfs_extent *ext, u64 start, u64 len)
 	return !(e_end < start || ext->start > end);
 }
 
-bool scoutfs_ext_inside(u64 start, u64 len, struct scoutfs_extent *out)
+static bool ext_inside(u64 start, u64 len, struct scoutfs_extent *out)
 {
 	u64 in_end = start + len - 1;
 	u64 out_end = out->start + out->len - 1;
@@ -192,9 +191,6 @@ int scoutfs_ext_insert(struct super_block *sb, struct scoutfs_ext_ops *ops,
 
 	/* inserting extent must not overlap */
 	if (found.len && ext_overlap(&ins, found.start, found.len)) {
-		if (ops->insert_overlap_warn)
-			scoutfs_err(sb, "inserting extent %llu.%llu overlaps existing %llu.%llu",
-					start, len, found.start, found.len);
 		ret = -EINVAL;
 		goto out;
 	}
@@ -245,9 +241,7 @@ int scoutfs_ext_remove(struct super_block *sb, struct scoutfs_ext_ops *ops,
 		goto out;
 
 	/* removed extent must be entirely within found */
-	if (!scoutfs_ext_inside(start, len, &found)) {
-		scoutfs_err(sb, "error removing extent %llu.%llu, isn't inside existing %llu.%llu",
-				start, len, found.start, found.len);
+	if (!ext_inside(start, len, &found)) {
 		ret = -EINVAL;
 		goto out;
 	}
@@ -347,7 +341,7 @@ int scoutfs_ext_set(struct super_block *sb, struct scoutfs_ext_ops *ops,
 
 	if (ret == 0 && ext_overlap(&found, start, len)) {
 		/* set extent must be entirely within found */
-		if (!scoutfs_ext_inside(start, len, &found)) {
+		if (!ext_inside(start, len, &found)) {
 			ret = -EINVAL;
 			goto out;
 		}

kmod/src/ext.h

@@ -15,8 +15,6 @@ struct scoutfs_ext_ops {
 		      u64 start, u64 len, u64 map, u8 flags);
 	int (*remove)(struct super_block *sb, void *arg, u64 start, u64 len,
 		      u64 map, u8 flags);
-
-	bool insert_overlap_warn;
 };
 
 bool scoutfs_ext_can_merge(struct scoutfs_extent *left,
@@ -33,6 +31,5 @@ int scoutfs_ext_alloc(struct super_block *sb, struct scoutfs_ext_ops *ops,
 		      struct scoutfs_extent *ext);
 int scoutfs_ext_set(struct super_block *sb, struct scoutfs_ext_ops *ops,
 		    void *arg, u64 start, u64 len, u64 map, u8 flags);
-bool scoutfs_ext_inside(u64 start, u64 len, struct scoutfs_extent *out);
 
 #endif

kmod/src/fence.c

@@ -1,481 +0,0 @@
-/*
- * Copyright (C) 2019 Versity Software, Inc.  All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License v2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- */
-#include <linux/kernel.h>
-#include <linux/fs.h>
-#include <linux/slab.h>
-#include <linux/sched.h>
-#include <linux/kobject.h>
-#include <linux/sysfs.h>
-#include <linux/device.h>
-#include <linux/timer.h>
-#include <asm/barrier.h>
-
-#include "super.h"
-#include "msg.h"
-#include "sysfs.h"
-#include "server.h"
-#include "fence.h"
-
-/*
- * Fencing ensures that a given mount can no longer write to the
- * metadata or data devices.  It's necessary to ensure that it's safe to
- * give another mount access to a resource that is currently owned by a
- * mount that has stopped responding.
- *
- * Fencing is performed in collaboration between the currently elected
- * quorum leader mount and userspace running on its host.  The kernel
- * creates fencing requests as it notices that mounts have stopped
- * participating.  The fence requests are published as directories in
- * sysfs.  Userspace agents watch for directories, take action, and
- * write to files in the directory to indicate that the mount has been
- * fenced.  Once the mount is fenced the server can reclaim the
- * resources previously held by the fenced mount.
- *
- * The fence requests contain metadata identifying the specific instance
- * of the mount that needs to be fenced.  This lets a fencing agent
- * ensure that a specific mount has been fenced without necessarily
- * destroying the node that was hosting it.  Maybe the node had rebooted
- * and the mount is no longer there, maybe the mount can be force
- * unmounted, maybe the node can be configured to isolate the mount from
- * the devices.
- *
- * The fencing mechanism is asynchronous and can fail but the server
- * cannot make progress until it completes.  If a fence request times
- * out the server shuts down in the hope that another instance of a
- * server might have more luck fencing a non-responsive mount.
- *
- * Sources of fencing are fundamentally anchored in shared persistent
- * state.  It is possible, though unlikely, that servers can fence a
- * node and then themselves fail, leaving the next server to try and
- * fence the mount again.
- */
-
-struct fence_info {
-	struct kset *kset;
-	struct kobject fence_dir_kobj;
-	struct workqueue_struct *wq;
-	wait_queue_head_t waitq;
-	spinlock_t lock;
-	struct list_head list;
-};
-
-#define DECLARE_FENCE_INFO(sb, name) \
-	struct fence_info *name = SCOUTFS_SB(sb)->fence_info
-
-struct pending_fence {
-	struct super_block *sb;
-	struct scoutfs_sysfs_attrs ssa;
-	struct list_head entry;
-	struct timer_list timer;
-
-	ktime_t start_kt;
-	__be32 ipv4_addr;
-	bool fenced;
-	bool error;
-	int reason;
-	u64 rid;
-};
-
-#define FENCE_FROM_KOBJ(kobj)					\
-	container_of(SCOUTFS_SYSFS_ATTRS(kobj), struct pending_fence, ssa)
-#define DECLARE_FENCE_FROM_KOBJ(name, kobj)				\
-	struct pending_fence *name = FENCE_FROM_KOBJ(kobj)
-
-static void destroy_fence(struct pending_fence *fence)
-{
-	struct super_block *sb = fence->sb;
-
-	scoutfs_sysfs_destroy_attrs(sb, &fence->ssa);
-	del_timer_sync(&fence->timer);
-	kfree(fence);
-}
-
-static ssize_t elapsed_secs_show(struct kobject *kobj,
-				 struct kobj_attribute *attr, char *buf)
-{
-	DECLARE_FENCE_FROM_KOBJ(fence, kobj);
-	ktime_t now = ktime_get();
-	struct timeval tv = { 0, };
-
-	if (ktime_after(now, fence->start_kt))
-		tv = ktime_to_timeval(ktime_sub(now, fence->start_kt));
-
-	return snprintf(buf, PAGE_SIZE, "%llu", (long long)tv.tv_sec);
-}
-SCOUTFS_ATTR_RO(elapsed_secs);
-
-static ssize_t fenced_show(struct kobject *kobj, struct kobj_attribute *attr,
-			   char *buf)
-{
-	DECLARE_FENCE_FROM_KOBJ(fence, kobj);
-
-	return snprintf(buf, PAGE_SIZE, "%u", !!fence->fenced);
-}
-
-/*
- * any write to the fenced file from userspace indicates that the mount
- * has been safely fenced and can no longer write to the shared device.
- */
-static ssize_t fenced_store(struct kobject *kobj, struct kobj_attribute *attr,
-			    const char *buf, size_t count)
-{
-	DECLARE_FENCE_FROM_KOBJ(fence, kobj);
-	DECLARE_FENCE_INFO(fence->sb, fi);
-
-	if (!fence->fenced) {
-		del_timer_sync(&fence->timer);
-		fence->fenced = true;
-		wake_up(&fi->waitq);
-	}
-
-	return count;
-}
-SCOUTFS_ATTR_RW(fenced);
-
-static ssize_t error_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
-{
-	DECLARE_FENCE_FROM_KOBJ(fence, kobj);
-
-	return snprintf(buf, PAGE_SIZE, "%u", !!fence->error);
-}
-
-/*
- * Fencing can tell us that they were unable to fence the given mount.
- * We can't continue if the mount can't be isolated so we shut down the
- * server.
- */
-static ssize_t error_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf,
-			   size_t count)
-{
-	DECLARE_FENCE_FROM_KOBJ(fence, kobj);
-	struct super_block *sb = fence->sb;
-	DECLARE_FENCE_INFO(fence->sb, fi);
-
-	if (!fence->error) {
-		fence->error = true;
-		scoutfs_err(sb, "error indicated by fence action for rid %016llx", fence->rid);
-		wake_up(&fi->waitq);
-	}
-
-	return count;
-}
-SCOUTFS_ATTR_RW(error);
-
-static ssize_t ipv4_addr_show(struct kobject *kobj,
-			      struct kobj_attribute *attr, char *buf)
-{
-	DECLARE_FENCE_FROM_KOBJ(fence, kobj);
-
-	return snprintf(buf, PAGE_SIZE, "%pI4", &fence->ipv4_addr);
-}
-SCOUTFS_ATTR_RO(ipv4_addr);
-
-static ssize_t reason_show(struct kobject *kobj, struct kobj_attribute *attr,
-			   char *buf)
-{
-	DECLARE_FENCE_FROM_KOBJ(fence, kobj);
-	unsigned r = fence->reason;
-	char *str = "unknown";
-	static char *reasons[] = {
-		[SCOUTFS_FENCE_CLIENT_RECOVERY] = "client_recovery",
-		[SCOUTFS_FENCE_CLIENT_RECONNECT] = "client_reconnect",
-		[SCOUTFS_FENCE_QUORUM_BLOCK_LEADER] = "quorum_block_leader",
-	};
-
-	if (r < ARRAY_SIZE(reasons) && reasons[r])
-		str = reasons[r];
-
-	return snprintf(buf, PAGE_SIZE, "%s", str);
-}
-SCOUTFS_ATTR_RO(reason);
-
-static ssize_t rid_show(struct kobject *kobj, struct kobj_attribute *attr,
-			char *buf)
-{
-	DECLARE_FENCE_FROM_KOBJ(fence, kobj);
-
-	return snprintf(buf, PAGE_SIZE, "%016llx", fence->rid);
-}
-SCOUTFS_ATTR_RO(rid);
-
-static struct attribute *fence_attrs[] = {
-	SCOUTFS_ATTR_PTR(elapsed_secs),
-	SCOUTFS_ATTR_PTR(fenced),
-	SCOUTFS_ATTR_PTR(error),
-	SCOUTFS_ATTR_PTR(ipv4_addr),
-	SCOUTFS_ATTR_PTR(reason),
-	SCOUTFS_ATTR_PTR(rid),
-	NULL,
-};
-
-#define FENCE_TIMEOUT_MS (MSEC_PER_SEC * 30)
-
-static void fence_timeout(struct timer_list *timer)
-{
-	struct pending_fence *fence = from_timer(fence, timer, timer);
-	struct super_block *sb = fence->sb;
-	DECLARE_FENCE_INFO(sb, fi);
-
-	fence->error = true;
-	scoutfs_err(sb, "fence request for rid %016llx was not serviced in %lums, raising error",
-		    fence->rid, FENCE_TIMEOUT_MS);
-	wake_up(&fi->waitq);
-}
-
-int scoutfs_fence_start(struct super_block *sb, u64 rid, __be32 ipv4_addr, int reason)
-{
-	DECLARE_FENCE_INFO(sb, fi);
-	struct pending_fence *fence;
-	int ret;
-
-	fence = kzalloc(sizeof(struct pending_fence), GFP_NOFS);
-	if (!fence) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	fence->sb = sb;
-	scoutfs_sysfs_init_attrs(sb, &fence->ssa);
-
-	fence->start_kt = ktime_get();
-	fence->ipv4_addr = ipv4_addr;
-	fence->fenced = false;
-	fence->error = false;
-	fence->reason = reason;
-	fence->rid = rid;
-
-	ret = scoutfs_sysfs_create_attrs_parent(sb, &fi->kset->kobj,
-						&fence->ssa, fence_attrs,
-						"%016llx", rid);
-	if (ret < 0) {
-		kfree(fence);
-		goto out;
-	}
-
-	timer_setup(&fence->timer, fence_timeout, 0);
-	fence->timer.expires = jiffies + msecs_to_jiffies(FENCE_TIMEOUT_MS);
-	add_timer(&fence->timer);
-
-	spin_lock(&fi->lock);
-	list_add_tail(&fence->entry, &fi->list);
-	spin_unlock(&fi->lock);
-out:
-	return ret;
-}
-
-/*
- * Give the caller the rid of the next fence request which has been
- * fenced.  This doesn't have a position from which to return the next
- * because the caller either frees the fence request it's given or shuts
- * down.
- */
-int scoutfs_fence_next(struct super_block *sb, u64 *rid, int *reason, bool *error)
-{
-	DECLARE_FENCE_INFO(sb, fi);
-	struct pending_fence *fence;
-	int ret = -ENOENT;
-
-	spin_lock(&fi->lock);
-	list_for_each_entry(fence, &fi->list, entry) {
-		if (fence->fenced || fence->error) {
-			*rid = fence->rid;
-			*reason = fence->reason;
-			*error = fence->error;
-			ret = 0;
-			break;
-		}
-	}
-	spin_unlock(&fi->lock);
-
-	return ret;
-}
-
-int scoutfs_fence_reason_pending(struct super_block *sb, int reason)
-{
-	DECLARE_FENCE_INFO(sb, fi);
-	struct pending_fence *fence;
-	bool pending = false;
-
-	spin_lock(&fi->lock);
-	list_for_each_entry(fence, &fi->list, entry) {
-		if (fence->reason == reason) {
-			pending = true;
-			break;
-		}
-	}
-	spin_unlock(&fi->lock);
-
-	return pending;
-}
-
-int scoutfs_fence_free(struct super_block *sb, u64 rid)
-{
-	DECLARE_FENCE_INFO(sb, fi);
-	struct pending_fence *fence;
-	int ret = -ENOENT;
-
-	spin_lock(&fi->lock);
-	list_for_each_entry(fence, &fi->list, entry) {
-		if (fence->rid == rid) {
-			list_del_init(&fence->entry);
-			ret = 0;
-			break;
-		}
-	}
-	spin_unlock(&fi->lock);
-
-	if (ret == 0) {
-		destroy_fence(fence);
-		wake_up(&fi->waitq);
-	}
-
-	return ret;
-}
-
-static bool all_fenced(struct fence_info *fi, bool *error)
-{
-	struct pending_fence *fence;
-	bool all = true;
-
-	*error = false;
-
-	spin_lock(&fi->lock);
-	list_for_each_entry(fence, &fi->list, entry) {
-		if (fence->error) {
-			*error = true;
-			all = true;
-			break;
-		}
-		if (!fence->fenced) {
-			all = false;
-			break;
-		}
-	}
-	spin_unlock(&fi->lock);
-
-	return all;
-}
-
-/*
- * The caller waits for all the current requests to be fenced, but not
- * necessarily reclaimed.
- */
-int scoutfs_fence_wait_fenced(struct super_block *sb, long timeout_jiffies)
-{
-	DECLARE_FENCE_INFO(sb, fi);
-	bool error;
-	long ret;
-
-	ret = wait_event_timeout(fi->waitq, all_fenced(fi, &error), timeout_jiffies);
-	if (ret == 0)
-		ret = -ETIMEDOUT;
-	else if (ret > 0)
-		ret = 0;
-	else if (error)
-		ret = -EIO;
-
-	return ret;
-}
-
-/*
- * This must be called early during startup so that it is guaranteed that
- * no other subsystems will try and call fence_start while we're waiting
- * for testing fence requests to complete.
- */
-int scoutfs_fence_setup(struct super_block *sb)
-{
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-	struct scoutfs_mount_options opts;
-	struct fence_info *fi;
-	int ret;
-
-	/* can only fence if we can be elected by quorum */
-	scoutfs_options_read(sb, &opts);
-	if (opts.quorum_slot_nr == -1) {
-		ret = 0;
-		goto out;
-	}
-
-	fi = kzalloc(sizeof(struct fence_info), GFP_KERNEL);
-	if (!fi) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	init_waitqueue_head(&fi->waitq);
-	spin_lock_init(&fi->lock);
-	INIT_LIST_HEAD(&fi->list);
-
-	sbi->fence_info = fi;
-
-	fi->kset = kset_create_and_add("fence", NULL, scoutfs_sysfs_sb_dir(sb));
-	if (!fi->kset) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	fi->wq = alloc_workqueue("scoutfs_fence",
-				 WQ_UNBOUND | WQ_NON_REENTRANT, 0);
-	if (!fi->wq) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	ret = 0;
-out:
-	if (ret)
-		scoutfs_fence_destroy(sb);
-
-	return ret;
-}
-
-/*
- * Tear down all pending fence requests because the server is shutting down.
- */
-void scoutfs_fence_stop(struct super_block *sb)
-{
-	DECLARE_FENCE_INFO(sb, fi);
-	struct pending_fence *fence;
-
-	do {
-		spin_lock(&fi->lock);
-		fence = list_first_entry_or_null(&fi->list, struct pending_fence, entry);
-		if (fence)
-			list_del_init(&fence->entry);
-		spin_unlock(&fi->lock);
-
-		if (fence) {
-			destroy_fence(fence);
-			wake_up(&fi->waitq);
-		}
-	} while (fence);
-}
-
-void scoutfs_fence_destroy(struct super_block *sb)
-{
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-	struct fence_info *fi = SCOUTFS_SB(sb)->fence_info;
-	struct pending_fence *fence;
-	struct pending_fence *tmp;
-
-	if (fi) {
-		if (fi->wq)
-			destroy_workqueue(fi->wq);
-		list_for_each_entry_safe(fence, tmp, &fi->list, entry)
-			destroy_fence(fence);
-		if (fi->kset)
-			kset_unregister(fi->kset);
-		kfree(fi);
-		sbi->fence_info = NULL;
-	}
-}

kmod/src/fence.h

@@ -1,20 +0,0 @@
-#ifndef _SCOUTFS_FENCE_H_
-#define _SCOUTFS_FENCE_H_
-
-enum {
-	SCOUTFS_FENCE_CLIENT_RECOVERY,
-	SCOUTFS_FENCE_CLIENT_RECONNECT,
-	SCOUTFS_FENCE_QUORUM_BLOCK_LEADER,
-};
-
-int scoutfs_fence_start(struct super_block *sb, u64 rid, __be32 ipv4_addr, int reason);
-int scoutfs_fence_next(struct super_block *sb, u64 *rid, int *reason, bool *error);
-int scoutfs_fence_reason_pending(struct super_block *sb, int reason);
-int scoutfs_fence_free(struct super_block *sb, u64 rid);
-int scoutfs_fence_wait_fenced(struct super_block *sb, long timeout_jiffies);
-
-int scoutfs_fence_setup(struct super_block *sb);
-void scoutfs_fence_stop(struct super_block *sb);
-void scoutfs_fence_destroy(struct super_block *sb);
-
-#endif

kmod/src/file.c

@@ -27,15 +27,8 @@
 #include "file.h"
 #include "inode.h"
 #include "per_task.h"
-#include "omap.h"
 
-#ifdef KC_LINUX_HAVE_FOP_AIO_READ
-/*
- * Start a high level file read.  We check for offline extents in the
- * read region here so that we only check the extents once.  We use the
- * dio count to prevent releasing while we're reading after we've
- * checked the extents.
- */
+/* TODO: Direct I/O, AIO */
 ssize_t scoutfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
 			      unsigned long nr_segs, loff_t pos)
 {
@@ -43,39 +36,37 @@ ssize_t scoutfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
 	struct inode *inode = file_inode(file);
 	struct scoutfs_inode_info *si = SCOUTFS_I(inode);
 	struct super_block *sb = inode->i_sb;
-	struct scoutfs_lock *scoutfs_inode_lock = NULL;
+	struct scoutfs_lock *inode_lock = NULL;
 	SCOUTFS_DECLARE_PER_TASK_ENTRY(pt_ent);
 	DECLARE_DATA_WAIT(dw);
 	int ret;
 
 retry:
-	/* protect checked extents from release */
-	inode_lock(inode);
-	atomic_inc(&inode->i_dio_count);
-	inode_unlock(inode);
-
 	ret = scoutfs_lock_inode(sb, SCOUTFS_LOCK_READ,
-				 SCOUTFS_LKF_REFRESH_INODE, inode, &scoutfs_inode_lock);
+				 SCOUTFS_LKF_REFRESH_INODE, inode, &inode_lock);
 	if (ret)
 		goto out;
 
-	if (scoutfs_per_task_add_excl(&si->pt_data_lock, &pt_ent, scoutfs_inode_lock)) {
+	if (scoutfs_per_task_add_excl(&si->pt_data_lock, &pt_ent, inode_lock)) {
+		/* protect checked extents from stage/release */
+		mutex_lock(&inode->i_mutex);
+		atomic_inc(&inode->i_dio_count);
+		mutex_unlock(&inode->i_mutex);
+
 		ret = scoutfs_data_wait_check_iov(inode, iov, nr_segs, pos,
 						  SEF_OFFLINE,
 						  SCOUTFS_IOC_DWO_READ,
-						  &dw, scoutfs_inode_lock);
+						  &dw, inode_lock);
 		if (ret != 0)
 			goto out;
-	} else {
-		WARN_ON_ONCE(true);
 	}
 
 	ret = generic_file_aio_read(iocb, iov, nr_segs, pos);
 
 out:
-	inode_dio_done(inode);
-	scoutfs_per_task_del(&si->pt_data_lock, &pt_ent);
-	scoutfs_unlock(sb, scoutfs_inode_lock, SCOUTFS_LOCK_READ);
+	if (scoutfs_per_task_del(&si->pt_data_lock, &pt_ent))
+		inode_dio_done(inode);
+	scoutfs_unlock(sb, inode_lock, SCOUTFS_LOCK_READ);
 
 	if (scoutfs_data_wait_found(&dw)) {
 		ret = scoutfs_data_wait(inode, &dw);
@@ -93,7 +84,7 @@ ssize_t scoutfs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 	struct inode *inode = file_inode(file);
 	struct scoutfs_inode_info *si = SCOUTFS_I(inode);
 	struct super_block *sb = inode->i_sb;
-	struct scoutfs_lock *scoutfs_inode_lock = NULL;
+	struct scoutfs_lock *inode_lock = NULL;
 	SCOUTFS_DECLARE_PER_TASK_ENTRY(pt_ent);
 	DECLARE_DATA_WAIT(dw);
 	int ret;
@@ -102,22 +93,22 @@ ssize_t scoutfs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 		return 0;
 
 retry:
-	inode_lock(inode);
+	mutex_lock(&inode->i_mutex);
 	ret = scoutfs_lock_inode(sb, SCOUTFS_LOCK_WRITE,
-				 SCOUTFS_LKF_REFRESH_INODE, inode, &scoutfs_inode_lock);
+				 SCOUTFS_LKF_REFRESH_INODE, inode, &inode_lock);
 	if (ret)
 		goto out;
 
-	ret = scoutfs_complete_truncate(inode, scoutfs_inode_lock);
+	ret = scoutfs_complete_truncate(inode, inode_lock);
 	if (ret)
 		goto out;
 
-	if (scoutfs_per_task_add_excl(&si->pt_data_lock, &pt_ent, scoutfs_inode_lock)) {
+	if (scoutfs_per_task_add_excl(&si->pt_data_lock, &pt_ent, inode_lock)) {
 		/* data_version is per inode, whole file must be online */
 		ret = scoutfs_data_wait_check(inode, 0, i_size_read(inode),
 					      SEF_OFFLINE,
 					      SCOUTFS_IOC_DWO_WRITE,
-					      &dw, scoutfs_inode_lock);
+					      &dw, inode_lock);
 		if (ret != 0)
 			goto out;
 	}
@@ -128,8 +119,8 @@ retry:
 
 out:
 	scoutfs_per_task_del(&si->pt_data_lock, &pt_ent);
-	scoutfs_unlock(sb, scoutfs_inode_lock, SCOUTFS_LOCK_WRITE);
-	inode_unlock(inode);
+	scoutfs_unlock(sb, inode_lock, SCOUTFS_LOCK_WRITE);
+	mutex_unlock(&inode->i_mutex);
 
 	if (scoutfs_data_wait_found(&dw)) {
 		ret = scoutfs_data_wait(inode, &dw);
@@ -147,113 +138,6 @@ out:
 
 	return ret;
 }
-#else
-ssize_t scoutfs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
-{
-	struct file *file = iocb->ki_filp;
-	struct inode *inode = file_inode(file);
-	struct scoutfs_inode_info *si = SCOUTFS_I(inode);
-	struct super_block *sb = inode->i_sb;
-	struct scoutfs_lock *scoutfs_inode_lock = NULL;
-	SCOUTFS_DECLARE_PER_TASK_ENTRY(pt_ent);
-	DECLARE_DATA_WAIT(dw);
-	int ret;
-
-retry:
-	/* protect checked extents from release */
-	inode_lock(inode);
-	atomic_inc(&inode->i_dio_count);
-	inode_unlock(inode);
-
-	ret = scoutfs_lock_inode(sb, SCOUTFS_LOCK_READ,
-				 SCOUTFS_LKF_REFRESH_INODE, inode, &scoutfs_inode_lock);
-	if (ret)
-		goto out;
-
-	if (scoutfs_per_task_add_excl(&si->pt_data_lock, &pt_ent, scoutfs_inode_lock)) {
-		ret = scoutfs_data_wait_check_iter(inode, iocb->ki_pos, to,
-						   SEF_OFFLINE,
-						   SCOUTFS_IOC_DWO_READ,
-						   &dw, scoutfs_inode_lock);
-		if (ret != 0)
-			goto out;
-	} else {
-		WARN_ON_ONCE(true);
-	}
-
-	ret = generic_file_read_iter(iocb, to);
-
-out:
-	inode_dio_end(inode);
-	scoutfs_per_task_del(&si->pt_data_lock, &pt_ent);
-	scoutfs_unlock(sb, scoutfs_inode_lock, SCOUTFS_LOCK_READ);
-
-	if (scoutfs_data_wait_found(&dw)) {
-		ret = scoutfs_data_wait(inode, &dw);
-		if (ret == 0)
-			goto retry;
-	}
-	return ret;
-}
-
-ssize_t scoutfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
-{
-	struct file *file = iocb->ki_filp;
-	struct inode *inode = file_inode(file);
-	struct scoutfs_inode_info *si = SCOUTFS_I(inode);
-	struct super_block *sb = inode->i_sb;
-	struct scoutfs_lock *scoutfs_inode_lock = NULL;
-	SCOUTFS_DECLARE_PER_TASK_ENTRY(pt_ent);
-	DECLARE_DATA_WAIT(dw);
-	int ret;
-	int written;
-
-retry:
-	inode_lock(inode);
-	ret = scoutfs_lock_inode(sb, SCOUTFS_LOCK_WRITE,
-				 SCOUTFS_LKF_REFRESH_INODE, inode, &scoutfs_inode_lock);
-	if (ret)
-		goto out;
-
-	ret = generic_write_checks(iocb, from);
-	if (ret <= 0)
-		goto out;
-
-	ret = scoutfs_complete_truncate(inode, scoutfs_inode_lock);
-	if (ret)
-		goto out;
-
-	if (scoutfs_per_task_add_excl(&si->pt_data_lock, &pt_ent, scoutfs_inode_lock)) {
-		/* data_version is per inode, whole file must be online */
-		ret = scoutfs_data_wait_check_iter(inode, iocb->ki_pos, from,
-						   SEF_OFFLINE,
-						   SCOUTFS_IOC_DWO_WRITE,
-						   &dw, scoutfs_inode_lock);
-		if (ret != 0)
-			goto out;
-	}
-
-	/* XXX: remove SUID bit */
-
-	written = __generic_file_write_iter(iocb, from);
-
-out:
-	scoutfs_per_task_del(&si->pt_data_lock, &pt_ent);
-	scoutfs_unlock(sb, scoutfs_inode_lock, SCOUTFS_LOCK_WRITE);
-	inode_unlock(inode);
-
-	if (scoutfs_data_wait_found(&dw)) {
-		ret = scoutfs_data_wait(inode, &dw);
-		if (ret == 0)
-			goto retry;
-	}
-
-	if (ret > 0 || ret == -EIOCBQUEUED)
-		ret = generic_write_sync(iocb, written);
-
-	return written ? written : ret;
-}
-#endif
 
 int scoutfs_permission(struct inode *inode, int mask)
 {

kmod/src/file.h

@@ -1,15 +1,10 @@
 #ifndef _SCOUTFS_FILE_H_
 #define _SCOUTFS_FILE_H_
 
-#ifdef KC_LINUX_HAVE_FOP_AIO_READ
 ssize_t scoutfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
 			      unsigned long nr_segs, loff_t pos);
 ssize_t scoutfs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 			       unsigned long nr_segs, loff_t pos);
-#else
-ssize_t scoutfs_file_read_iter(struct kiocb *, struct iov_iter *);
-ssize_t scoutfs_file_write_iter(struct kiocb *, struct iov_iter *);
-#endif
 int scoutfs_permission(struct inode *inode, int mask);
 loff_t scoutfs_file_llseek(struct file *file, loff_t offset, int whence);
 

kmod/src/forest.c

@@ -26,7 +26,6 @@
 #include "hash.h"
 #include "srch.h"
 #include "counters.h"
-#include "xattr.h"
 #include "scoutfs_trace.h"
 
 /*
@@ -38,9 +37,9 @@
  *
  * The log btrees are modified by multiple transactions over time so
  * there is no consistent ordering relationship between the items in
- * different btrees.  Each item in a log btree stores a seq for the
- * item.  Readers check log btrees for the most recent seq that it
- * should use.
+ * different btrees.  Each item in a log btree stores a version number
+ * for the item.  Readers check log btrees for the most recent version
+ * that it should use.
  *
  * The item cache reads items in bulk from stable btrees, and writes a
  * transaction's worth of dirty items into the item log btree.
@@ -53,8 +52,6 @@
  */
 
 struct forest_info {
-	struct super_block *sb;
-
 	struct mutex mutex;
 	struct scoutfs_alloc *alloc;
 	struct scoutfs_block_writer *wri;
@@ -63,11 +60,6 @@ struct forest_info {
 	struct mutex srch_mutex;
 	struct scoutfs_srch_file srch_file;
 	struct scoutfs_block *srch_bl;
-
-	struct workqueue_struct *workq;
-	struct delayed_work log_merge_dwork;
-
-	atomic64_t inode_count_delta;
 };
 
 #define DECLARE_FOREST_INFO(sb, name) \
@@ -78,6 +70,11 @@ struct forest_refs {
 	struct scoutfs_block_ref logs_ref;
 };
 
+/* initialize some refs that initially aren't equal */
+#define DECLARE_STALE_TRACKING_SUPER_REFS(a, b)		\
+	struct forest_refs a = {{cpu_to_le64(0),}};	\
+	struct forest_refs b = {{cpu_to_le64(1),}}
+
 struct forest_bloom_nrs {
 	unsigned int nrs[SCOUTFS_FOREST_BLOOM_NRS];
 };
@@ -131,11 +128,11 @@ static struct scoutfs_block *read_bloom_ref(struct super_block *sb, struct scout
 int scoutfs_forest_next_hint(struct super_block *sb, struct scoutfs_key *key,
 			     struct scoutfs_key *next)
 {
+	DECLARE_STALE_TRACKING_SUPER_REFS(prev_refs, refs);
 	struct scoutfs_net_roots roots;
 	struct scoutfs_btree_root item_root;
 	struct scoutfs_log_trees *lt;
 	SCOUTFS_BTREE_ITEM_REF(iref);
-	DECLARE_SAVED_REFS(saved);
 	struct scoutfs_key found;
 	struct scoutfs_key ltk;
 	bool checked_fs;
@@ -150,6 +147,8 @@ retry:
 		goto out;
 
 	trace_scoutfs_forest_using_roots(sb, &roots.fs_root, &roots.logs_root);
+	refs.fs_ref = roots.fs_root.ref;
+	refs.logs_ref = roots.logs_root.ref;
 
 	scoutfs_key_init_log_trees(&ltk, 0, 0);
 	checked_fs = false;
@@ -205,25 +204,37 @@ retry:
 		}
 	}
 
-	ret = scoutfs_block_check_stale(sb, ret, &saved, &roots.fs_root.ref, &roots.logs_root.ref);
-	if (ret == -ESTALE)
+	if (ret == -ESTALE) {
+		if (memcmp(&prev_refs, &refs, sizeof(refs)) == 0)
+			return -EIO;
+		prev_refs = refs;
 		goto retry;
+	}
 out:
+
 	return ret;
 }
 
 struct forest_read_items_data {
-	int fic;
+	bool is_fs;
 	scoutfs_forest_item_cb cb;
 	void *cb_arg;
 };
 
-static int forest_read_items(struct super_block *sb, struct scoutfs_key *key, u64 seq, u8 flags,
+static int forest_read_items(struct super_block *sb, struct scoutfs_key *key,
 			     void *val, int val_len, void *arg)
 {
 	struct forest_read_items_data *rid = arg;
+	struct scoutfs_log_item_value _liv = {0,};
+	struct scoutfs_log_item_value *liv = &_liv;
 
-	return rid->cb(sb, key, seq, flags, val, val_len, rid->fic, rid->cb_arg);
+	if (!rid->is_fs) {
+		liv = val;
+		val += sizeof(struct scoutfs_log_item_value);
+		val_len -= sizeof(struct scoutfs_log_item_value);
+	}
+
+	return rid->cb(sb, key, liv, val, val_len, rid->cb_arg);
 }
 
 /*
@@ -235,16 +246,19 @@ static int forest_read_items(struct super_block *sb, struct scoutfs_key *key, u6
  * that covers all the blocks.  Any keys outside of this range can't be
  * trusted because we didn't visit all the trees to check their items.
  *
- * We return -ESTALE if we hit stale blocks to give the caller a chance
- * to reset their state and retry with a newer version of the btrees.
+ * If we hit stale blocks and retry we can call the callback for
+ * duplicate items.  This is harmless because the items are stable while
+ * the caller holds their cluster lock and the caller has to filter out
+ * item versions anyway.
  */
 int scoutfs_forest_read_items(struct super_block *sb,
+			      struct scoutfs_lock *lock,
 			      struct scoutfs_key *key,
-			      struct scoutfs_key *bloom_key,
 			      struct scoutfs_key *start,
 			      struct scoutfs_key *end,
 			      scoutfs_forest_item_cb cb, void *arg)
 {
+	DECLARE_STALE_TRACKING_SUPER_REFS(prev_refs, refs);
 	struct forest_read_items_data rid = {
 		.cb = cb,
 		.cb_arg = arg,
@@ -256,30 +270,32 @@ int scoutfs_forest_read_items(struct super_block *sb,
 	SCOUTFS_BTREE_ITEM_REF(iref);
 	struct scoutfs_block *bl;
 	struct scoutfs_key ltk;
-	struct scoutfs_key orig_start = *start;
-	struct scoutfs_key orig_end = *end;
 	int ret;
 	int i;
 
 	scoutfs_inc_counter(sb, forest_read_items);
-	calc_bloom_nrs(&bloom, bloom_key);
+	calc_bloom_nrs(&bloom, &lock->start);
 
+	roots = lock->roots;
+retry:
 	ret = scoutfs_client_get_roots(sb, &roots);
 	if (ret)
 		goto out;
 
 	trace_scoutfs_forest_using_roots(sb, &roots.fs_root, &roots.logs_root);
+	refs.fs_ref = roots.fs_root.ref;
+	refs.logs_ref = roots.logs_root.ref;
 
-	*start = orig_start;
-	*end = orig_end;
+	*start = lock->start;
+	*end = lock->end;
 
 	/* start with fs root items */
-	rid.fic |= FIC_FS_ROOT;
+	rid.is_fs = true;
 	ret = scoutfs_btree_read_items(sb, &roots.fs_root, key, start, end,
 				       forest_read_items, &rid);
 	if (ret < 0)
 		goto out;
-	rid.fic &= ~FIC_FS_ROOT;
+	rid.is_fs = false;
 
 	scoutfs_key_init_log_trees(&ltk, 0, 0);
 	for (;; scoutfs_key_inc(&ltk)) {
@@ -324,40 +340,30 @@ int scoutfs_forest_read_items(struct super_block *sb,
 
 		scoutfs_inc_counter(sb, forest_bloom_pass);
 
-		if ((le64_to_cpu(lt.flags) & SCOUTFS_LOG_TREES_FINALIZED))
-			rid.fic |= FIC_FINALIZED;
-
 		ret = scoutfs_btree_read_items(sb, &lt.item_root, key, start,
 					       end, forest_read_items, &rid);
 		if (ret < 0)
 			goto out;
-
-		rid.fic &= ~FIC_FINALIZED;
 	}
 
 	ret = 0;
 out:
+	if (ret == -ESTALE) {
+		if (memcmp(&prev_refs, &refs, sizeof(refs)) == 0) {
+			ret = -EIO;
+			goto out;
+		}
+		prev_refs = refs;
+
+		ret = scoutfs_client_get_roots(sb, &roots);
+		if (ret)
+			goto out;
+		goto retry;
+	}
+
 	return ret;
 }
 
-/*
- * If the items are deltas then combine the src with the destination
- * value and store the result in the destination.
- *
- * Returns:
- *  -errno: fatal error, no change
- *  0: not delta items, no change
- *  +ve: SCOUTFS_DELTA_ values indicating when dst and/or src can be dropped
- */
-int scoutfs_forest_combine_deltas(struct scoutfs_key *key, void *dst, int dst_len,
-				  void *src, int src_len)
-{
-	if (key->sk_zone == SCOUTFS_XATTR_TOTL_ZONE)
-		return scoutfs_xattr_combine_totl(dst, dst_len, src, src_len);
-
-	return 0;
-}
-
 /*
  * Make sure that the bloom bits for the lock's start key are all set in
  * the current log's bloom block.  We record the nr of our log tree in
@@ -427,29 +433,29 @@ out:
 
 /*
  * The caller is commiting items in the transaction and has found the
- * greatest item seq amongst them.  We store it in the log_trees root
+ * greatest item version amongst them.  We store it in the log_trees root
  * to send to the server.
  */
-void scoutfs_forest_set_max_seq(struct super_block *sb, u64 max_seq)
+void scoutfs_forest_set_max_vers(struct super_block *sb, u64 max_vers)
 {
 	DECLARE_FOREST_INFO(sb, finf);
 
-	finf->our_log.max_item_seq = cpu_to_le64(max_seq);
+	finf->our_log.max_item_vers = cpu_to_le64(max_vers);
 }
 
 /*
- * The server is calling during setup to find the greatest item seq
+ * The server is calling during setup to find the greatest item version
  * amongst all the log tree roots.  They have the authoritative current
  * super.
  *
- * Item seqs are only used to compare items in log trees, not in the
- * main fs tree.  All we have to do is find the greatest seq amongst the
- * log_trees so that the core seq will have a greater seq than all the
- * items in the log_trees.
+ * Item versions are only used to compare items in log trees, not in the
+ * main fs tree.  All we have to do is find the greatest version amongst
+ * the log_trees so that new locks will have a write_version greater
+ * than all the items in the log_trees.
  */
-int scoutfs_forest_get_max_seq(struct super_block *sb,
-			       struct scoutfs_super_block *super,
-			       u64 *seq)
+int scoutfs_forest_get_max_vers(struct super_block *sb,
+				struct scoutfs_super_block *super,
+				u64 *vers)
 {
 	struct scoutfs_log_trees *lt;
 	SCOUTFS_BTREE_ITEM_REF(iref);
@@ -457,7 +463,7 @@ int scoutfs_forest_get_max_seq(struct super_block *sb,
 	int ret;
 
 	scoutfs_key_init_log_trees(&ltk, 0, 0);
-	*seq = 0;
+	*vers = 0;
 
 	for (;; scoutfs_key_inc(&ltk)) {
 		ret = scoutfs_btree_next(sb, &super->logs_root, &ltk, &iref);
@@ -465,7 +471,8 @@ int scoutfs_forest_get_max_seq(struct super_block *sb,
 			if (iref.val_len == sizeof(struct scoutfs_log_trees)) {
 				ltk = *iref.key;
 				lt = iref.val;
-				*seq = max(*seq, le64_to_cpu(lt->max_item_seq));
+				*vers = max(*vers,
+					    le64_to_cpu(lt->max_item_vers));
 			} else {
 				ret = -EIO;
 			}
@@ -514,59 +521,6 @@ int scoutfs_forest_srch_add(struct super_block *sb, u64 hash, u64 ino, u64 id)
 	return ret;
 }
 
-void scoutfs_forest_inc_inode_count(struct super_block *sb)
-{
-	DECLARE_FOREST_INFO(sb, finf);
-
-	atomic64_inc(&finf->inode_count_delta);
-}
-
-void scoutfs_forest_dec_inode_count(struct super_block *sb)
-{
-	DECLARE_FOREST_INFO(sb, finf);
-
-	atomic64_dec(&finf->inode_count_delta);
-}
-
-/*
- * Return the total inode count from the super block and all the
- * log_btrees it references.  ESTALE from read blocks is returned to the
- * caller who is expected to retry or return hard errors.
- */
-int scoutfs_forest_inode_count(struct super_block *sb, struct scoutfs_super_block *super,
-			       u64 *inode_count)
-{
-	struct scoutfs_log_trees *lt;
-	SCOUTFS_BTREE_ITEM_REF(iref);
-	struct scoutfs_key key;
-	int ret;
-
-	*inode_count = le64_to_cpu(super->inode_count);
-
-	scoutfs_key_init_log_trees(&key, 0, 0);
-	for (;;) {
-		ret = scoutfs_btree_next(sb, &super->logs_root, &key, &iref);
-		if (ret == 0) {
-			if (iref.val_len == sizeof(*lt)) {
-				key = *iref.key;
-				scoutfs_key_inc(&key);
-				lt = iref.val;
-				*inode_count += le64_to_cpu(lt->inode_count_delta);
-			} else {
-				ret = -EIO;
-			}
-			scoutfs_btree_put_iref(&iref);
-		}
-		if (ret < 0) {
-			if (ret == -ENOENT)
-				ret = 0;
-			break;
-		}
-	}
-
-	return ret;
-}
-
 /*
  * This is called from transactions as a new transaction opens and is
  * serialized with all writers.
@@ -587,7 +541,7 @@ void scoutfs_forest_init_btrees(struct super_block *sb,
 	memset(&finf->our_log, 0, sizeof(finf->our_log));
 	finf->our_log.item_root = lt->item_root;
 	finf->our_log.bloom_ref = lt->bloom_ref;
-	finf->our_log.max_item_seq = lt->max_item_seq;
+	finf->our_log.max_item_vers = lt->max_item_vers;
 	finf->our_log.rid = lt->rid;
 	finf->our_log.nr = lt->nr;
 	finf->srch_file = lt->srch_file;
@@ -595,8 +549,6 @@ void scoutfs_forest_init_btrees(struct super_block *sb,
 	WARN_ON_ONCE(finf->srch_bl); /* commiting should have put the block */
 	finf->srch_bl = NULL;
 
-	atomic64_set(&finf->inode_count_delta, le64_to_cpu(lt->inode_count_delta));
-
 	trace_scoutfs_forest_init_our_log(sb, le64_to_cpu(lt->rid),
 					  le64_to_cpu(lt->nr),
 					  le64_to_cpu(lt->item_root.ref.blkno),
@@ -619,137 +571,15 @@ void scoutfs_forest_get_btrees(struct super_block *sb,
 	lt->item_root = finf->our_log.item_root;
 	lt->bloom_ref = finf->our_log.bloom_ref;
 	lt->srch_file = finf->srch_file;
-	lt->max_item_seq = finf->our_log.max_item_seq;
+	lt->max_item_vers = finf->our_log.max_item_vers;
 
 	scoutfs_block_put(sb, finf->srch_bl);
 	finf->srch_bl = NULL;
 
-	lt->inode_count_delta = cpu_to_le64(atomic64_read(&finf->inode_count_delta));
-
 	trace_scoutfs_forest_prepare_commit(sb, &lt->item_root.ref,
 					    &lt->bloom_ref);
 }
 
-#define LOG_MERGE_DELAY_MS (5 * MSEC_PER_SEC)
-
-/*
- * Regularly try to get a log merge request from the server.  If we get
- * a request we walk the log_trees items to find input trees and pass
- * them to btree_merge.  All of our work is done in dirty blocks
- * allocated from available free blocks that the server gave us.  If we
- * hit an error then we drop our dirty blocks without writing them and
- * send an error flag to the server so they can reclaim our allocators
- * and ignore the rest of our work.
- */
-static void scoutfs_forest_log_merge_worker(struct work_struct *work)
-{
-	struct forest_info *finf = container_of(work, struct forest_info,
-						log_merge_dwork.work);
-	struct super_block *sb = finf->sb;
-	struct scoutfs_btree_root_head *rhead = NULL;
-	struct scoutfs_btree_root_head *tmp;
-	struct scoutfs_log_merge_complete comp;
-	struct scoutfs_log_merge_request req;
-	struct scoutfs_log_trees *lt;
-	struct scoutfs_block_writer wri;
-	struct scoutfs_alloc alloc;
-	SCOUTFS_BTREE_ITEM_REF(iref);
-	struct scoutfs_key next;
-	struct scoutfs_key key;
-	unsigned long delay;
-	LIST_HEAD(inputs);
-	int ret;
-
-	ret = scoutfs_client_get_log_merge(sb, &req);
-	if (ret < 0)
-		goto resched;
-
-	comp.root = req.root;
-	comp.start = req.start;
-	comp.end = req.end;
-	comp.remain = req.end;
-	comp.rid = req.rid;
-	comp.seq = req.seq;
-	comp.flags = 0;
-
-	scoutfs_alloc_init(&alloc, &req.meta_avail, &req.meta_freed);
-	scoutfs_block_writer_init(sb, &wri);
-
-	/* find finalized input log trees within the input seq */
-	for (scoutfs_key_init_log_trees(&key, 0, 0); ; scoutfs_key_inc(&key)) {
-
-		if (!rhead) {
-			rhead = kmalloc(sizeof(*rhead), GFP_NOFS);
-			if (!rhead) {
-				ret = -ENOMEM;
-				goto out;
-			}
-		}
-
-		ret = scoutfs_btree_next(sb, &req.logs_root, &key, &iref);
-		if (ret == 0) {
-			if (iref.val_len == sizeof(*lt)) {
-				key = *iref.key;
-				lt = iref.val;
-				if (lt->item_root.ref.blkno != 0 &&
-				    (le64_to_cpu(lt->flags) & SCOUTFS_LOG_TREES_FINALIZED) &&
-				    (le64_to_cpu(lt->finalize_seq) < le64_to_cpu(req.input_seq))) {
-					rhead->root = lt->item_root;
-					list_add_tail(&rhead->head, &inputs);
-					rhead = NULL;
-				}
-			} else {
-				ret = -EIO;
-			}
-			scoutfs_btree_put_iref(&iref);
-		}
-		if (ret < 0) {
-			if (ret == -ENOENT) {
-				ret = 0;
-				break;
-			}
-			goto out;
-		}
-	}
-
-	/* shouldn't be possible, but it's harmless */
-	if (list_empty(&inputs)) {
-		ret = 0;
-		goto out;
-	}
-
-	ret = scoutfs_btree_merge(sb, &alloc, &wri, &req.start, &req.end,
-				  &next, &comp.root, &inputs,
-				  !!(req.flags & cpu_to_le64(SCOUTFS_LOG_MERGE_REQUEST_SUBTREE)),
-				  SCOUTFS_LOG_MERGE_DIRTY_BYTE_LIMIT, 10);
-	if (ret == -ERANGE) {
-		comp.remain = next;
-		le64_add_cpu(&comp.flags, SCOUTFS_LOG_MERGE_COMP_REMAIN);
-		ret = 0;
-	}
-
-out:
-	scoutfs_alloc_prepare_commit(sb, &alloc, &wri);
-	if (ret == 0)
-	      ret = scoutfs_block_writer_write(sb, &wri);
-	scoutfs_block_writer_forget_all(sb, &wri);
-
-	comp.meta_avail = alloc.avail;
-	comp.meta_freed = alloc.freed;
-	if (ret < 0)
-		le64_add_cpu(&comp.flags, SCOUTFS_LOG_MERGE_COMP_ERROR);
-
-	ret = scoutfs_client_commit_log_merge(sb, &comp);
-
-	kfree(rhead);
-	list_for_each_entry_safe(rhead, tmp, &inputs, head)
-		kfree(rhead);
-
-resched:
-	delay = ret == 0 ? 0 : msecs_to_jiffies(LOG_MERGE_DELAY_MS);
-	queue_delayed_work(finf->workq, &finf->log_merge_dwork, delay);
-}
-
 int scoutfs_forest_setup(struct super_block *sb)
 {
 	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
@@ -763,20 +593,10 @@ int scoutfs_forest_setup(struct super_block *sb)
 	}
 
 	/* the finf fields will be setup as we open a transaction */
-	finf->sb = sb;
 	mutex_init(&finf->mutex);
 	mutex_init(&finf->srch_mutex);
-	INIT_DELAYED_WORK(&finf->log_merge_dwork,
-			  scoutfs_forest_log_merge_worker);
+
 	sbi->forest_info = finf;
-
-	finf->workq = alloc_workqueue("scoutfs_log_merge", WQ_NON_REENTRANT |
-				      WQ_UNBOUND | WQ_HIGHPRI, 0);
-	if (!finf->workq) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
 	ret = 0;
 out:
 	if (ret)
@@ -785,24 +605,6 @@ out:
 	return 0;
 }
 
-void scoutfs_forest_start(struct super_block *sb)
-{
-	DECLARE_FOREST_INFO(sb, finf);
-
-	queue_delayed_work(finf->workq, &finf->log_merge_dwork,
-			   msecs_to_jiffies(LOG_MERGE_DELAY_MS));
-}
-
-void scoutfs_forest_stop(struct super_block *sb)
-{
-	DECLARE_FOREST_INFO(sb, finf);
-
-	if (finf && finf->workq) {
-		cancel_delayed_work_sync(&finf->log_merge_dwork);
-		destroy_workqueue(finf->workq);
-	}
-}
-
 void scoutfs_forest_destroy(struct super_block *sb)
 {
 	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
@@ -810,7 +612,6 @@ void scoutfs_forest_destroy(struct super_block *sb)
 
 	if (finf) {
 		scoutfs_block_put(sb, finf->srch_bl);
-
 		kfree(finf);
 		sbi->forest_info = NULL;
 	}

kmod/src/forest.h

@@ -8,36 +8,29 @@ struct scoutfs_block;
 #include "btree.h"
 
 /* caller gives an item to the callback */
-enum {
-	FIC_FS_ROOT = (1 << 0),
-	FIC_FINALIZED = (1 << 1),
-};
-typedef int (*scoutfs_forest_item_cb)(struct super_block *sb, struct scoutfs_key *key, u64 seq,
-				      u8 flags, void *val, int val_len, int fic, void *arg);
+typedef int (*scoutfs_forest_item_cb)(struct super_block *sb,
+				      struct scoutfs_key *key,
+				      struct scoutfs_log_item_value *liv,
+				      void *val, int val_len, void *arg);
 
 int scoutfs_forest_next_hint(struct super_block *sb, struct scoutfs_key *key,
 			     struct scoutfs_key *next);
 int scoutfs_forest_read_items(struct super_block *sb,
+			      struct scoutfs_lock *lock,
 			      struct scoutfs_key *key,
-			      struct scoutfs_key *bloom_key,
 			      struct scoutfs_key *start,
 			      struct scoutfs_key *end,
 			      scoutfs_forest_item_cb cb, void *arg);
 int scoutfs_forest_set_bloom_bits(struct super_block *sb,
 				  struct scoutfs_lock *lock);
-void scoutfs_forest_set_max_seq(struct super_block *sb, u64 max_seq);
-int scoutfs_forest_get_max_seq(struct super_block *sb,
-			       struct scoutfs_super_block *super,
-			       u64 *seq);
+void scoutfs_forest_set_max_vers(struct super_block *sb, u64 max_vers);
+int scoutfs_forest_get_max_vers(struct super_block *sb,
+				struct scoutfs_super_block *super,
+				u64 *vers);
 int scoutfs_forest_insert_list(struct super_block *sb,
 			       struct scoutfs_btree_item_list *lst);
 int scoutfs_forest_srch_add(struct super_block *sb, u64 hash, u64 ino, u64 id);
 
-void scoutfs_forest_inc_inode_count(struct super_block *sb);
-void scoutfs_forest_dec_inode_count(struct super_block *sb);
-int scoutfs_forest_inode_count(struct super_block *sb, struct scoutfs_super_block *super,
-			       u64 *inode_count);
-
 void scoutfs_forest_init_btrees(struct super_block *sb,
 				struct scoutfs_alloc *alloc,
 				struct scoutfs_block_writer *wri,
@@ -45,15 +38,7 @@ void scoutfs_forest_init_btrees(struct super_block *sb,
 void scoutfs_forest_get_btrees(struct super_block *sb,
 			       struct scoutfs_log_trees *lt);
 
-/* > 0 error codes */
-#define SCOUTFS_DELTA_COMBINED		1	/* src val was combined, drop src */
-#define SCOUTFS_DELTA_COMBINED_NULL	2	/* combined val has no data, drop both */
-int scoutfs_forest_combine_deltas(struct scoutfs_key *key, void *dst, int dst_len,
-				  void *src, int src_len);
-
 int scoutfs_forest_setup(struct super_block *sb);
-void scoutfs_forest_start(struct super_block *sb);
-void scoutfs_forest_stop(struct super_block *sb);
 void scoutfs_forest_destroy(struct super_block *sb);
 
 #endif

kmod/src/format.h

@@ -1,15 +1,8 @@
 #ifndef _SCOUTFS_FORMAT_H_
 #define _SCOUTFS_FORMAT_H_
 
-/*
- * The format version defines the format of structures on devices,
- * structures that are communicated over the wire, and the protocol
- * behind the structures.
- */
-#define SCOUTFS_FORMAT_VERSION_MIN		1
-#define SCOUTFS_FORMAT_VERSION_MIN_STR	__stringify(SCOUTFS_FORMAT_VERSION_MIN)
-#define SCOUTFS_FORMAT_VERSION_MAX		1
-#define SCOUTFS_FORMAT_VERSION_MAX_STR	__stringify(SCOUTFS_FORMAT_VERSION_MAX)
+#define SCOUTFS_INTEROP_VERSION		0ULL
+#define SCOUTFS_INTEROP_VERSION_STR	__stringify(0)
 
 /* statfs(2) f_type */
 #define SCOUTFS_SUPER_MAGIC	0x554f4353		/* "SCOU" */
@@ -175,11 +168,6 @@ struct scoutfs_key {
 #define sko_rid		_sk_first
 #define sko_ino		_sk_second
 
-/* xattr totl */
-#define skxt_a		_sk_first
-#define skxt_b		_sk_second
-#define skxt_c		_sk_third
-
 /* inode */
 #define ski_ino		_sk_first
 
@@ -207,16 +195,22 @@ struct scoutfs_key {
 #define sklt_rid	_sk_first
 #define sklt_nr		_sk_second
 
+/* lock clients */
+#define sklc_rid	_sk_first
+
+/* seqs */
+#define skts_trans_seq	_sk_first
+#define skts_rid	_sk_second
+
 /* mounted clients */
 #define skmc_rid	_sk_first
 
 /* free extents by blkno */
-#define skfb_end	_sk_first
-#define skfb_len	_sk_second
-/* free extents by order */
-#define skfo_revord	_sk_first
-#define skfo_end	_sk_second
-#define skfo_len	_sk_third
+#define skfb_end	_sk_second
+#define skfb_len	_sk_third
+/* free extents by len */
+#define skfl_neglen	_sk_second
+#define skfl_blkno	_sk_third
 
 struct scoutfs_avl_root {
 	__le16 node;
@@ -252,15 +246,11 @@ struct scoutfs_btree_root {
 struct scoutfs_btree_item {
 	struct scoutfs_avl_node node;
 	struct scoutfs_key key;
-	__le64 seq;
 	__le16 val_off;
 	__le16 val_len;
-	__u8 flags;
-	__u8 __pad[3];
+	__u8 __pad[4];
 };
 
-#define SCOUTFS_ITEM_FLAG_DELETION (1 << 0)
-
 struct scoutfs_btree_block {
 	struct scoutfs_block_header hdr;
 	struct scoutfs_avl_root item_root;
@@ -269,7 +259,7 @@ struct scoutfs_btree_block {
 	__le16 mid_free_len;
 	__u8 level;
 	__u8 __pad[7];
-	struct scoutfs_btree_item items[];
+	struct scoutfs_btree_item items[0];
 	/* leaf blocks have a fixed size item offset hash table at the end */
 };
 
@@ -298,10 +288,9 @@ struct scoutfs_alloc_list_head {
 	struct scoutfs_block_ref ref;
 	__le64 total_nr;
 	__le32 first_nr;
-	__le32 flags;
+	__u8 __pad[4];
 };
 
-
 /*
  * While the main allocator uses extent items in btree blocks, metadata
  * allocations for a single transaction are recorded in arrays in
@@ -318,7 +307,7 @@ struct scoutfs_alloc_list_block {
 	struct scoutfs_block_ref next;
 	__le32 start;
 	__le32 nr;
-	__le64 blknos[]; /* naturally aligned for sorting */
+	__le64 blknos[0]; /* naturally aligned for sorting */
 };
 
 #define SCOUTFS_ALLOC_LIST_MAX_BLOCKS					      \
@@ -330,25 +319,17 @@ struct scoutfs_alloc_list_block {
  */
 struct scoutfs_alloc_root {
 	__le64 total_len;
-	__le32 flags;
-	__le32 _pad;
 	struct scoutfs_btree_root root;
 };
 
-/* Shared by _alloc_list_head and _alloc_root */
-#define SCOUTFS_ALLOC_FLAG_LOW	(1U << 0)
-
 /* types of allocators, exposed to alloc_detail ioctl */
 #define SCOUTFS_ALLOC_OWNER_NONE	0
 #define SCOUTFS_ALLOC_OWNER_SERVER	1
 #define SCOUTFS_ALLOC_OWNER_MOUNT	2
 #define SCOUTFS_ALLOC_OWNER_SRCH	3
-#define SCOUTFS_ALLOC_OWNER_LOG_MERGE	4
 
 struct scoutfs_mounted_client_btree_val {
-	union scoutfs_inet_addr addr;
 	__u8 flags;
-	__u8 __pad[7];
 };
 
 #define SCOUTFS_MOUNTED_CLIENT_QUORUM	(1 << 0)
@@ -381,7 +362,7 @@ struct scoutfs_srch_file {
 
 struct scoutfs_srch_parent {
 	struct scoutfs_block_header hdr;
-	struct scoutfs_block_ref refs[];
+	struct scoutfs_block_ref refs[0];
 };
 
 #define SCOUTFS_SRCH_PARENT_REFS				\
@@ -396,7 +377,7 @@ struct scoutfs_srch_block {
 	struct scoutfs_srch_entry tail;
 	__le32 entry_nr;
 	__le32 entry_bytes;
-	__u8 entries[];
+	__u8 entries[0];
 };
 
 /*
@@ -449,20 +430,10 @@ struct scoutfs_srch_compact {
 /* client -> server: compaction failed */
 #define SCOUTFS_SRCH_COMPACT_FLAG_ERROR		(1 << 5)
 
-#define SCOUTFS_DATA_ALLOC_MAX_ZONES	1024
-#define SCOUTFS_DATA_ALLOC_ZONE_BYTES	DIV_ROUND_UP(SCOUTFS_DATA_ALLOC_MAX_ZONES, 8)
-#define SCOUTFS_DATA_ALLOC_ZONE_LE64S	DIV_ROUND_UP(SCOUTFS_DATA_ALLOC_MAX_ZONES, 64)
-
 /*
  * XXX I imagine we should rename these now that they've evolved to track
  * all the btrees that clients use during a transaction.  It's not just
  * about item logs, it's about clients making changes to trees.
- *
- * @get_trans_seq, @commit_trans_seq: These pair of sequence numbers
- * determine if a transaction is currently open for the mount that owns
- * the log_trees struct.  get_trans_seq is advanced by the server as the
- * transaction is opened.   The server sets comimt_trans_seq equal to
- * get_ as the transaction is committed.
  */
 struct scoutfs_log_trees {
 	struct scoutfs_alloc_list_head meta_avail;
@@ -472,27 +443,31 @@ struct scoutfs_log_trees {
 	struct scoutfs_alloc_root data_avail;
 	struct scoutfs_alloc_root data_freed;
 	struct scoutfs_srch_file srch_file;
-	__le64 data_alloc_zone_blocks;
-	__le64 data_alloc_zones[SCOUTFS_DATA_ALLOC_ZONE_LE64S];
-	__le64 inode_count_delta;
-	__le64 get_trans_seq;
-	__le64 commit_trans_seq;
-	__le64 max_item_seq;
-	__le64 finalize_seq;
+	__le64 max_item_vers;
 	__le64 rid;
 	__le64 nr;
-	__le64 flags;
 };
 
-#define SCOUTFS_LOG_TREES_FINALIZED	(1ULL << 0)
+struct scoutfs_log_item_value {
+	__le64 vers;
+	__u8 flags;
+	__u8 __pad[7];
+	__u8 data[0];
+};
 
-/* FS items are limited by the max btree value length */
-#define SCOUTFS_MAX_VAL_SIZE	SCOUTFS_BTREE_MAX_VAL_LEN
+/*
+ * FS items are limited by the max btree value length with the log item
+ * value header.
+ */
+#define SCOUTFS_MAX_VAL_SIZE \
+	(SCOUTFS_BTREE_MAX_VAL_LEN - sizeof(struct scoutfs_log_item_value))
+
+#define SCOUTFS_LOG_ITEM_FLAG_DELETION		(1 << 0)
 
 struct scoutfs_bloom_block {
 	struct scoutfs_block_header hdr;
 	__le64 total_set;
-	__le64 bits[];
+	__le64 bits[0];
 };
 
 /*
@@ -509,122 +484,50 @@ struct scoutfs_bloom_block {
 	 member_sizeof(struct scoutfs_bloom_block, bits[0]) * 8)
 #define SCOUTFS_FOREST_BLOOM_FUNC_BITS		(SCOUTFS_BLOCK_LG_SHIFT + 3)
 
-/*
- * A private server btree item which records the status of a log merge
- * operation that is in progress.
- */
-struct scoutfs_log_merge_status {
-	struct scoutfs_key next_range_key;
-	__le64 nr_requests;
-	__le64 nr_complete;
-	__le64 seq;
-};
-
-/*
- * A request is sent to the client and stored in a server btree item to
- * record resources that would be reclaimed if the client failed.  It
- * has all the inputs needed for the client to perform its portion of a
- * merge.
- */
-struct scoutfs_log_merge_request {
-	struct scoutfs_alloc_list_head meta_avail;
-	struct scoutfs_alloc_list_head meta_freed;
-	struct scoutfs_btree_root logs_root;
-	struct scoutfs_btree_root root;
-	struct scoutfs_key start;
-	struct scoutfs_key end;
-	__le64 input_seq;
-	__le64 rid;
-	__le64 seq;
-	__le64 flags;
-};
-
-/* request root is subtree of fs root at parent, restricted merging modifications */
-#define SCOUTFS_LOG_MERGE_REQUEST_SUBTREE	(1ULL << 0)
-
-/*
- * The output of a client's merge of log btree items into a subtree
- * rooted at a parent in the fs_root.  The client sends it to the
- * server, who stores it in a btree item for later splicing/rebalancing.
- */
-struct scoutfs_log_merge_complete {
-	struct scoutfs_alloc_list_head meta_avail;
-	struct scoutfs_alloc_list_head meta_freed;
-	struct scoutfs_btree_root root;
-	struct scoutfs_key start;
-	struct scoutfs_key end;
-	struct scoutfs_key remain;
-	__le64 rid;
-	__le64 seq;
-	__le64 flags;
-};
-
-/* merge failed, ignore completion and reclaim stored request */
-#define SCOUTFS_LOG_MERGE_COMP_ERROR	(1ULL << 0)
-/* merge didn't complete range, restart from remain */
-#define SCOUTFS_LOG_MERGE_COMP_REMAIN	(1ULL << 1)
-
-/*
- * Range items record the ranges of the fs keyspace that still need to
- * be merged.  They're added as a merge starts, removed as requests are
- * sent and added back if the request didn't consume its entire range.
- */
-struct scoutfs_log_merge_range {
-	struct scoutfs_key start;
-	struct scoutfs_key end;
-};
-
-struct scoutfs_log_merge_freeing {
-	struct scoutfs_btree_root root;
-	struct scoutfs_key key;
-	__le64 seq;
-};
-
 /*
  * Keys are first sorted by major key zones.
  */
-#define SCOUTFS_INODE_INDEX_ZONE		4
-#define SCOUTFS_ORPHAN_ZONE			8
-#define SCOUTFS_XATTR_TOTL_ZONE			12
-#define SCOUTFS_FS_ZONE				16
-#define SCOUTFS_LOCK_ZONE			20
+#define SCOUTFS_INODE_INDEX_ZONE		1
+#define SCOUTFS_RID_ZONE			2
+#define SCOUTFS_FS_ZONE				3
+#define SCOUTFS_LOCK_ZONE			4
 /* Items only stored in server btrees */
-#define SCOUTFS_LOG_TREES_ZONE			24
-#define SCOUTFS_MOUNTED_CLIENT_ZONE		28
-#define SCOUTFS_SRCH_ZONE			32
-#define SCOUTFS_FREE_EXTENT_BLKNO_ZONE		36
-#define SCOUTFS_FREE_EXTENT_ORDER_ZONE		40
-/* Items only stored in log merge server btrees */
-#define SCOUTFS_LOG_MERGE_STATUS_ZONE		44
-#define SCOUTFS_LOG_MERGE_RANGE_ZONE		48
-#define SCOUTFS_LOG_MERGE_REQUEST_ZONE		52
-#define SCOUTFS_LOG_MERGE_COMPLETE_ZONE		56
-#define SCOUTFS_LOG_MERGE_FREEING_ZONE		60
+#define SCOUTFS_LOG_TREES_ZONE			6
+#define SCOUTFS_LOCK_CLIENTS_ZONE		7
+#define SCOUTFS_TRANS_SEQ_ZONE			8
+#define SCOUTFS_MOUNTED_CLIENT_ZONE		9
+#define SCOUTFS_SRCH_ZONE			10
+#define SCOUTFS_FREE_EXTENT_ZONE		11
 
 /* inode index zone */
-#define SCOUTFS_INODE_INDEX_META_SEQ_TYPE	4
-#define SCOUTFS_INODE_INDEX_DATA_SEQ_TYPE	8
+#define SCOUTFS_INODE_INDEX_META_SEQ_TYPE	1
+#define SCOUTFS_INODE_INDEX_DATA_SEQ_TYPE	2
+#define SCOUTFS_INODE_INDEX_NR			3 /* don't forget to update */
 
-/* orphan zone, redundant type used for clarity */
-#define SCOUTFS_ORPHAN_TYPE			4
+/* rid zone (also used in server alloc btree) */
+#define SCOUTFS_ORPHAN_TYPE			1
 
 /* fs zone */
-#define SCOUTFS_INODE_TYPE			4
-#define SCOUTFS_XATTR_TYPE			8
-#define SCOUTFS_DIRENT_TYPE			12
-#define SCOUTFS_READDIR_TYPE			16
-#define SCOUTFS_LINK_BACKREF_TYPE		20
-#define SCOUTFS_SYMLINK_TYPE			24
-#define SCOUTFS_DATA_EXTENT_TYPE		28
+#define SCOUTFS_INODE_TYPE			1
+#define SCOUTFS_XATTR_TYPE			2
+#define SCOUTFS_DIRENT_TYPE			3
+#define SCOUTFS_READDIR_TYPE			4
+#define SCOUTFS_LINK_BACKREF_TYPE		5
+#define SCOUTFS_SYMLINK_TYPE			6
+#define SCOUTFS_DATA_EXTENT_TYPE		7
 
 /* lock zone, only ever found in lock ranges, never in persistent items */
-#define SCOUTFS_RENAME_TYPE			4
+#define SCOUTFS_RENAME_TYPE			1
 
 /* srch zone, only in server btrees */
-#define SCOUTFS_SRCH_LOG_TYPE		4
-#define SCOUTFS_SRCH_BLOCKS_TYPE	8
-#define SCOUTFS_SRCH_PENDING_TYPE	12
-#define SCOUTFS_SRCH_BUSY_TYPE		16
+#define SCOUTFS_SRCH_LOG_TYPE		1
+#define SCOUTFS_SRCH_BLOCKS_TYPE	2
+#define SCOUTFS_SRCH_PENDING_TYPE	3
+#define SCOUTFS_SRCH_BUSY_TYPE		4
+
+/* free extents in allocator btrees in client and server, by blkno or len */
+#define SCOUTFS_FREE_EXTENT_BLKNO_TYPE	1
+#define SCOUTFS_FREE_EXTENT_LEN_TYPE	2
 
 /* file data extents have start and len in key */
 struct scoutfs_data_extent_val {
@@ -646,20 +549,9 @@ struct scoutfs_xattr {
 	__le16 val_len;
 	__u8 name_len;
 	__u8 __pad[5];
-	__u8 name[];
+	__u8 name[0];
 };
 
-/*
- * .totl. xattrs are mapped to items.  The dotted u64s in the xattr name
- * map to the item key.  The item value total is the sum of all the
- * xattr values.   The item value count records the number of xattrs
- * contributing to the total and is used when combining logged items to
- * determine if totals are being created or destroyed.
- */
-struct scoutfs_xattr_totl_val {
-	__le64 total;
-	__le64 count;
-};
 
 /* XXX does this exist upstream somewhere? */
 #define member_sizeof(TYPE, MEMBER) (sizeof(((TYPE *)0)->MEMBER))
@@ -683,25 +575,16 @@ struct scoutfs_xattr_totl_val {
 #define SCOUTFS_QUORUM_ELECT_VAR_MS	100
 
 /*
- * Once a leader is elected they send heartbeat messages to all quorum
- * members at regular intervals to force members to wait the much longer
- * heartbeat timeout.  Once the heartbeat timeout expires without
- * receiving a heartbeat message a member will start an election.
+ * Once a leader is elected they send out heartbeats at regular
+ * intervals to force members to wait the much longer heartbeat timeout.
+ * Once heartbeat timeout expires without receiving a heartbeat they'll
+ * switch over the performing elections.
  *
  * These determine how long it could take members to notice that a
- * leader has gone silent and start to elect a new leader.  The
- * heartbeat timeout can be changed at run time by options.
+ * leader has gone silent and start to elect a new leader.
  */
 #define SCOUTFS_QUORUM_HB_IVAL_MS	100
-#define SCOUTFS_QUORUM_MIN_HB_TIMEO_MS	(2 * MSEC_PER_SEC)
-#define SCOUTFS_QUORUM_DEF_HB_TIMEO_MS	(10 * MSEC_PER_SEC)
-#define SCOUTFS_QUORUM_MAX_HB_TIMEO_MS	(60 * MSEC_PER_SEC)
-
-/*
- * A newly elected leader will give fencing some time before giving up and
- * shutting down.
- */
-#define SCOUTFS_QUORUM_FENCE_TO_MS	(15 * MSEC_PER_SEC)
+#define SCOUTFS_QUORUM_HB_TIMEO_MS	(5 * MSEC_PER_SEC)
 
 struct scoutfs_quorum_message {
 	__le64 fsid;
@@ -734,76 +617,35 @@ struct scoutfs_quorum_config {
 	} slots[SCOUTFS_QUORUM_MAX_SLOTS];
 };
 
-enum {
-	SCOUTFS_QUORUM_EVENT_BEGIN,		/* quorum service starting up */
-	SCOUTFS_QUORUM_EVENT_TERM,		/* updated persistent term */
-	SCOUTFS_QUORUM_EVENT_ELECT,		/* won election */
-	SCOUTFS_QUORUM_EVENT_FENCE,		/* server fenced others */
-	SCOUTFS_QUORUM_EVENT_STOP,		/* server stopped */
-	SCOUTFS_QUORUM_EVENT_END,		/* quorum service shutting down */
-	SCOUTFS_QUORUM_EVENT_NR,
-};
-
 struct scoutfs_quorum_block {
 	struct scoutfs_block_header hdr;
-	__le64 write_nr;
+	__le64 term;
+	__le64 random_write_mark;
+	__le64 flags;
 	struct scoutfs_quorum_block_event {
-		__le64 write_nr;
 		__le64 rid;
-		__le64 term;
 		struct scoutfs_timespec ts;
-	} events[SCOUTFS_QUORUM_EVENT_NR];
+	} write, update_term, set_leader, clear_leader, fenced;
 };
 
-/*
- * Tunable options that apply to the entire system.  They can be set in
- * mkfs or in sysfs files which send an rpc to the server to make the
- * change.  The super version defines the options that exist.
- *
- * @set_bits: bits for each 64bit starting offset after set_bits
- * indicate which logical option is set.
- *
- * @data_alloc_zone_blocks: if set, the data device is logically divided
- * into contiguous zones of this many blocks.  Data allocation will try
- * and isolate allocated extents for each mount to their own zone.  The
- * zone size must be larger than the data alloc high water mark and
- * large enough such that the number of zones is kept within its static
- * limit.
- */
-struct scoutfs_volume_options {
-	__le64 set_bits;
-	__le64 data_alloc_zone_blocks;
-	__le64 __future_expansion[63];
-};
-
-#define scoutfs_volopt_nr(field)							\
-	((offsetof(struct scoutfs_volume_options, field) -				\
-	  (offsetof(struct scoutfs_volume_options, set_bits) +				\
-	   member_sizeof(struct scoutfs_volume_options, set_bits))) / sizeof(__le64))
-#define scoutfs_volopt_bit(field)							\
-	(1ULL << scoutfs_volopt_nr(field))
-
-#define SCOUTFS_VOLOPT_DATA_ALLOC_ZONE_BLOCKS_NR \
-	scoutfs_volopt_nr(data_alloc_zone_blocks)
-#define SCOUTFS_VOLOPT_DATA_ALLOC_ZONE_BLOCKS_BIT \
-	scoutfs_volopt_bit(data_alloc_zone_blocks)
-
-#define SCOUTFS_VOLOPT_EXPANSION_BITS \
-	(~(scoutfs_volopt_bit(__future_expansion) - 1))
+#define SCOUTFS_QUORUM_BLOCK_LEADER (1 << 0)
 
 #define SCOUTFS_FLAG_IS_META_BDEV 0x01
 
 struct scoutfs_super_block {
 	struct scoutfs_block_header hdr;
 	__le64 id;
-	__le64 fmt_vers;
+	__le64 version;
 	__le64 flags;
 	__u8 uuid[SCOUTFS_UUID_BYTES];
-	__le64 seq;
 	__le64 next_ino;
-	__le64 inode_count;
+	__le64 next_trans_seq;
 	__le64 total_meta_blocks;	/* both static and dynamic */
+	__le64 first_meta_blkno;	/* first dynamically allocated */
+	__le64 last_meta_blkno;
 	__le64 total_data_blocks;
+	__le64 first_data_blkno;
+	__le64 last_data_blkno;
 	struct scoutfs_quorum_config qconf;
 	struct scoutfs_alloc_root meta_alloc[2];
 	struct scoutfs_alloc_root data_alloc;
@@ -811,10 +653,10 @@ struct scoutfs_super_block {
 	struct scoutfs_alloc_list_head server_meta_freed[2];
 	struct scoutfs_btree_root fs_root;
 	struct scoutfs_btree_root logs_root;
-	struct scoutfs_btree_root log_merge;
+	struct scoutfs_btree_root lock_clients;
+	struct scoutfs_btree_root trans_seqs;
 	struct scoutfs_btree_root mounted_clients;
 	struct scoutfs_btree_root srch_root;
-	struct scoutfs_volume_options volopt;
 };
 
 #define SCOUTFS_ROOT_INO 1
@@ -838,6 +680,13 @@ struct scoutfs_super_block {
  *
  * @offline_blocks: The number of fixed 4k blocks that could be made
  * online by staging.
+ *
+ * XXX
+ *	- otime?
+ *	- compat flags?
+ *	- version?
+ *	- generation?
+ *	- be more careful with rdev?
  */
 struct scoutfs_inode {
 	__le64 size;
@@ -848,7 +697,6 @@ struct scoutfs_inode {
 	__le64 offline_blocks;
 	__le64 next_readdir_pos;
 	__le64 next_xattr_id;
-	__le64 version;
 	__le32 nlink;
 	__le32 uid;
 	__le32 gid;
@@ -858,7 +706,6 @@ struct scoutfs_inode {
 	struct scoutfs_timespec atime;
 	struct scoutfs_timespec ctime;
 	struct scoutfs_timespec mtime;
-	struct scoutfs_timespec crtime;
 };
 
 #define SCOUTFS_INO_FLAG_TRUNCATE 0x1
@@ -882,7 +729,7 @@ struct scoutfs_dirent {
 	__le64 pos;
 	__u8 type;
 	__u8 __pad[7];
-	__u8 name[];
+	__u8 name[0];
 };
 
 #define SCOUTFS_NAME_LEN 255
@@ -910,7 +757,6 @@ enum scoutfs_dentry_type {
 #define SCOUTFS_XATTR_MAX_NAME_LEN	255
 #define SCOUTFS_XATTR_MAX_VAL_LEN	65535
 #define SCOUTFS_XATTR_MAX_PART_SIZE	SCOUTFS_MAX_VAL_SIZE
-#define SCOUTFS_XATTR_MAX_TOTL_U64	23 /* octal U64_MAX */
 
 #define SCOUTFS_XATTR_NR_PARTS(name_len, val_len)			\
 	DIV_ROUND_UP(sizeof(struct scoutfs_xattr) + name_len + val_len, \
@@ -941,7 +787,7 @@ enum scoutfs_dentry_type {
  */
 struct scoutfs_net_greeting {
 	__le64 fsid;
-	__le64 fmt_vers;
+	__le64 version;
 	__le64 server_term;
 	__le64 rid;
 	__le64 flags;
@@ -972,6 +818,7 @@ struct scoutfs_net_greeting {
  * response messages.
  */
 struct scoutfs_net_header {
+	__le64 clock_sync_id;
 	__le64 seq;
 	__le64 recv_seq;
 	__le64 id;
@@ -980,7 +827,7 @@ struct scoutfs_net_header {
 	__u8 flags;
 	__u8 error;
 	__u8 __pad[3];
-	__u8 data[];
+	__u8 data[0];
 };
 
 #define SCOUTFS_NET_FLAG_RESPONSE	(1 << 0)
@@ -991,21 +838,13 @@ enum scoutfs_net_cmd {
 	SCOUTFS_NET_CMD_ALLOC_INODES,
 	SCOUTFS_NET_CMD_GET_LOG_TREES,
 	SCOUTFS_NET_CMD_COMMIT_LOG_TREES,
-	SCOUTFS_NET_CMD_SYNC_LOG_TREES,
 	SCOUTFS_NET_CMD_GET_ROOTS,
+	SCOUTFS_NET_CMD_ADVANCE_SEQ,
 	SCOUTFS_NET_CMD_GET_LAST_SEQ,
 	SCOUTFS_NET_CMD_LOCK,
 	SCOUTFS_NET_CMD_LOCK_RECOVER,
 	SCOUTFS_NET_CMD_SRCH_GET_COMPACT,
 	SCOUTFS_NET_CMD_SRCH_COMMIT_COMPACT,
-	SCOUTFS_NET_CMD_GET_LOG_MERGE,
-	SCOUTFS_NET_CMD_COMMIT_LOG_MERGE,
-	SCOUTFS_NET_CMD_OPEN_INO_MAP,
-	SCOUTFS_NET_CMD_GET_VOLOPT,
-	SCOUTFS_NET_CMD_SET_VOLOPT,
-	SCOUTFS_NET_CMD_CLEAR_VOLOPT,
-	SCOUTFS_NET_CMD_RESIZE_DEVICES,
-	SCOUTFS_NET_CMD_STATFS,
 	SCOUTFS_NET_CMD_FAREWELL,
 	SCOUTFS_NET_CMD_UNKNOWN,
 };
@@ -1048,32 +887,23 @@ struct scoutfs_net_roots {
 	struct scoutfs_btree_root srch_root;
 };
 
-struct scoutfs_net_resize_devices {
-	__le64 new_total_meta_blocks;
-	__le64 new_total_data_blocks;
-};
-
-struct scoutfs_net_statfs {
-	__u8 uuid[SCOUTFS_UUID_BYTES];
-	__le64 free_meta_blocks;
-	__le64 total_meta_blocks;
-	__le64 free_data_blocks;
-	__le64 total_data_blocks;
-	__le64 inode_count;
-};
-
 struct scoutfs_net_lock {
 	struct scoutfs_key key;
-	__le64 write_seq;
+	__le64 write_version;
 	__u8 old_mode;
 	__u8 new_mode;
 	__u8 __pad[6];
 };
 
+struct scoutfs_net_lock_grant_response {
+	struct scoutfs_net_lock nl;
+	struct scoutfs_net_roots roots;
+};
+
 struct scoutfs_net_lock_recover {
 	__le16 nr;
 	__u8 __pad[6];
-	struct scoutfs_net_lock locks[];
+	struct scoutfs_net_lock locks[0];
 };
 
 #define SCOUTFS_NET_LOCK_MAX_RECOVER_NR					       \
@@ -1088,7 +918,6 @@ enum scoutfs_lock_trace {
 	SLT_INVALIDATE,
 	SLT_REQUEST,
 	SLT_RESPONSE,
-	SLT_NR,
 };
 
 /*
@@ -1141,42 +970,4 @@ enum scoutfs_corruption_sources {
 
 #define SC_NR_LONGS DIV_ROUND_UP(SC_NR_SOURCES, BITS_PER_LONG)
 
-#define SCOUTFS_OPEN_INO_MAP_SHIFT	10
-#define SCOUTFS_OPEN_INO_MAP_BITS	(1 << SCOUTFS_OPEN_INO_MAP_SHIFT)
-#define SCOUTFS_OPEN_INO_MAP_MASK	(SCOUTFS_OPEN_INO_MAP_BITS - 1)
-#define SCOUTFS_OPEN_INO_MAP_LE64S	(SCOUTFS_OPEN_INO_MAP_BITS / 64)
-
-/*
- * The request and response conversation is as follows:
- *
- * client[init] -> server:
- *	group_nr = G
- *	req_id = 0	(I)
- * server -> client[*]
- *	group_nr = G
- *	req_id = R
- * client[*] -> server
- *	group_nr = G	(I)
- *	req_id = R
- *	bits
- * server -> client[init]
- *	group_nr = G	(I)
- *	req_id = R	(I)
- *	bits
- *
- * Many of the fields in individual messages are ignored ("I") because
- * the net id or the omap req_id can be used to identify the
- * conversation.  We always include them on the wire to make inspected
- * messages easier to follow.
- */
-struct scoutfs_open_ino_map_args {
-	__le64 group_nr;
-	__le64 req_id;
-};
-
-struct scoutfs_open_ino_map {
-	struct scoutfs_open_ino_map_args args;
-	__le64 bits[SCOUTFS_OPEN_INO_MAP_LE64S];
-};
-
 #endif

kmod/src/inode.h

@@ -9,8 +9,6 @@
 
 struct scoutfs_lock;
 
-#define SCOUTFS_INODE_NR_INDICES 2
-
 struct scoutfs_inode_info {
 	/* read or initialized for each inode instance */
 	u64 ino;
@@ -22,7 +20,6 @@ struct scoutfs_inode_info {
 	u64 online_blocks;
 	u64 offline_blocks;
 	u32 flags;
-	struct kc_timespec crtime;
 
 	/*
 	 * Protects per-inode extent items, most particularly readers
@@ -40,8 +37,8 @@ struct scoutfs_inode_info {
 	 */
 	struct mutex item_mutex;
 	bool have_item;
-	u64 item_majors[SCOUTFS_INODE_NR_INDICES];
-	u32 item_minors[SCOUTFS_INODE_NR_INDICES];
+	u64 item_majors[SCOUTFS_INODE_INDEX_NR];
+	u32 item_minors[SCOUTFS_INODE_INDEX_NR];
 
 	/* updated at on each new lock acquisition */
 	atomic64_t last_refreshed;
@@ -52,20 +49,11 @@ struct scoutfs_inode_info {
 	struct scoutfs_per_task pt_data_lock;
 	struct scoutfs_data_waitq data_waitq;
 	struct rw_semaphore xattr_rwsem;
-	struct list_head writeback_entry;
-
-	struct scoutfs_lock_coverage ino_lock_cov;
-
-	struct list_head iput_head;
-	unsigned long iput_count;
-	unsigned long iput_flags;
+	struct rb_node writeback_node;
 
 	struct inode inode;
 };
 
-/* try to prune dcache aliases with queued iput */
-#define SI_IPUT_FLAG_PRUNE	(1 << 0)
-
 static inline struct scoutfs_inode_info *SCOUTFS_I(struct inode *inode)
 {
 	return container_of(inode, struct scoutfs_inode_info, inode);
@@ -80,15 +68,11 @@ struct inode *scoutfs_alloc_inode(struct super_block *sb);
 void scoutfs_destroy_inode(struct inode *inode);
 int scoutfs_drop_inode(struct inode *inode);
 void scoutfs_evict_inode(struct inode *inode);
-void scoutfs_inode_queue_iput(struct inode *inode, unsigned long flags);
+int scoutfs_orphan_inode(struct inode *inode);
 
-#define SCOUTFS_IGF_LINKED (1 << 0) /* enoent if nlink == 0 */
-struct inode *scoutfs_iget(struct super_block *sb, u64 ino, int lkf, int igf);
-struct inode *scoutfs_ilookup_nowait(struct super_block *sb, u64 ino);
-struct inode *scoutfs_ilookup_nowait_nonewfree(struct super_block *sb, u64 ino);
+struct inode *scoutfs_iget(struct super_block *sb, u64 ino);
+struct inode *scoutfs_ilookup(struct super_block *sb, u64 ino);
 
-
-void scoutfs_inode_init_key(struct scoutfs_key *key, u64 ino);
 void scoutfs_inode_init_index_key(struct scoutfs_key *key, u8 type, u64 major,
 				  u32 minor, u64 ino);
 int scoutfs_inode_index_start(struct super_block *sb, u64 *seq);
@@ -98,9 +82,9 @@ int scoutfs_inode_index_prepare_ino(struct super_block *sb,
 				    struct list_head *list, u64 ino,
 				    umode_t mode);
 int scoutfs_inode_index_try_lock_hold(struct super_block *sb,
-				      struct list_head *list, u64 seq, bool allocing);
+				      struct list_head *list, u64 seq);
 int scoutfs_inode_index_lock_hold(struct inode *inode, struct list_head *list,
-				  bool set_data_seq, bool allocing);
+				  bool set_data_seq);
 void scoutfs_inode_index_unlock(struct super_block *sb, struct list_head *list);
 
 int scoutfs_dirty_inode_item(struct inode *inode, struct scoutfs_lock *lock);
@@ -108,8 +92,9 @@ void scoutfs_update_inode_item(struct inode *inode, struct scoutfs_lock *lock,
 			       struct list_head *ind_locks);
 
 int scoutfs_alloc_ino(struct super_block *sb, bool is_dir, u64 *ino_ret);
-int scoutfs_new_inode(struct super_block *sb, struct inode *dir, umode_t mode, dev_t rdev,
-		      u64 ino, struct scoutfs_lock *lock, struct inode **inode_ret);
+struct inode *scoutfs_new_inode(struct super_block *sb, struct inode *dir,
+				umode_t mode, dev_t rdev, u64 ino,
+				struct scoutfs_lock *lock);
 
 void scoutfs_inode_set_meta_seq(struct inode *inode);
 void scoutfs_inode_set_data_seq(struct inode *inode);
@@ -122,32 +107,23 @@ u64 scoutfs_inode_data_version(struct inode *inode);
 void scoutfs_inode_get_onoff(struct inode *inode, s64 *on, s64 *off);
 int scoutfs_complete_truncate(struct inode *inode, struct scoutfs_lock *lock);
 
-int scoutfs_inode_refresh(struct inode *inode, struct scoutfs_lock *lock);
-#ifdef KC_LINUX_HAVE_RHEL_IOPS_WRAPPER
+int scoutfs_inode_refresh(struct inode *inode, struct scoutfs_lock *lock,
+			  int flags);
 int scoutfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
 		    struct kstat *stat);
-#else
-int scoutfs_getattr(const struct path *path, struct kstat *stat,
-		    u32 request_mask, unsigned int query_flags);
-#endif
 int scoutfs_setattr(struct dentry *dentry, struct iattr *attr);
 
-int scoutfs_inode_orphan_create(struct super_block *sb, u64 ino, struct scoutfs_lock *lock,
-				struct scoutfs_lock *primary);
-int scoutfs_inode_orphan_delete(struct super_block *sb, u64 ino, struct scoutfs_lock *lock,
-				struct scoutfs_lock *primary);
-void scoutfs_inode_schedule_orphan_dwork(struct super_block *sb);
+int scoutfs_scan_orphans(struct super_block *sb);
 
 void scoutfs_inode_queue_writeback(struct inode *inode);
 int scoutfs_inode_walk_writeback(struct super_block *sb, bool write);
 
+u64 scoutfs_last_ino(struct super_block *sb);
+
 void scoutfs_inode_exit(void);
 int scoutfs_inode_init(void);
 
 int scoutfs_inode_setup(struct super_block *sb);
-void scoutfs_inode_start(struct super_block *sb);
-void scoutfs_inode_orphan_stop(struct super_block *sb);
-void scoutfs_inode_flush_iput(struct super_block *sb);
 void scoutfs_inode_destroy(struct super_block *sb);
 
 #endif

kmod/src/ioctl.c

@@ -21,8 +21,6 @@
 #include <linux/mm.h>
 #include <linux/sched.h>
 #include <linux/aio.h>
-#include <linux/list_sort.h>
-#include <linux/backing-dev.h>
 
 #include "format.h"
 #include "key.h"
@@ -40,8 +38,6 @@
 #include "hash.h"
 #include "srch.h"
 #include "alloc.h"
-#include "server.h"
-#include "counters.h"
 #include "scoutfs_trace.h"
 
 /*
@@ -303,7 +299,7 @@ static long scoutfs_ioc_release(struct file *file, unsigned long arg)
 	if (ret)
 		return ret;
 
-	inode_lock(inode);
+	mutex_lock(&inode->i_mutex);
 
 	ret = scoutfs_lock_inode(sb, SCOUTFS_LOCK_WRITE,
 				 SCOUTFS_LKF_REFRESH_INODE, inode, &lock);
@@ -352,7 +348,7 @@ static long scoutfs_ioc_release(struct file *file, unsigned long arg)
 
 out:
 	scoutfs_unlock(sb, lock, SCOUTFS_LOCK_WRITE);
-	inode_unlock(inode);
+	mutex_unlock(&inode->i_mutex);
 	mnt_drop_write_file(file);
 
 	trace_scoutfs_ioc_release_ret(sb, scoutfs_ino(inode), ret);
@@ -388,13 +384,13 @@ static long scoutfs_ioc_data_wait_err(struct file *file, unsigned long arg)
 	if (sblock > eblock)
 		return -EINVAL;
 
-	inode = scoutfs_ilookup_nowait_nonewfree(sb, args.ino);
+	inode = scoutfs_ilookup(sb, args.ino);
 	if (!inode) {
 		ret = -ESTALE;
 		goto out;
 	}
 
-	inode_lock(inode);
+	mutex_lock(&inode->i_mutex);
 
 	ret = scoutfs_lock_inode(sb, SCOUTFS_LOCK_READ,
 				 SCOUTFS_LKF_REFRESH_INODE, inode, &lock);
@@ -412,7 +408,7 @@ static long scoutfs_ioc_data_wait_err(struct file *file, unsigned long arg)
 
 	scoutfs_unlock(sb, lock, SCOUTFS_LOCK_READ);
 unlock:
-	inode_unlock(inode);
+	mutex_unlock(&inode->i_mutex);
 	iput(inode);
 out:
 	return ret;
@@ -449,6 +445,7 @@ static long scoutfs_ioc_stage(struct file *file, unsigned long arg)
 {
 	struct inode *inode = file_inode(file);
 	struct super_block *sb = inode->i_sb;
+	struct address_space *mapping = inode->i_mapping;
 	struct scoutfs_inode_info *si = SCOUTFS_I(inode);
 	SCOUTFS_DECLARE_PER_TASK_ENTRY(pt_ent);
 	struct scoutfs_ioctl_stage args;
@@ -480,10 +477,8 @@ static long scoutfs_ioc_stage(struct file *file, unsigned long arg)
 	/* the iocb is really only used for the file pointer :P */
 	init_sync_kiocb(&kiocb, file);
 	kiocb.ki_pos = args.offset;
-#ifdef KC_LINUX_AIO_KI_LEFT
 	kiocb.ki_left = args.length;
 	kiocb.ki_nbytes = args.length;
-#endif
 	iov.iov_base = (void __user *)(unsigned long)args.buf_ptr;
 	iov.iov_len = args.length;
 
@@ -491,7 +486,7 @@ static long scoutfs_ioc_stage(struct file *file, unsigned long arg)
 	if (ret)
 		return ret;
 
-	inode_lock(inode);
+	mutex_lock(&inode->i_mutex);
 
 	ret = scoutfs_lock_inode(sb, SCOUTFS_LOCK_WRITE,
 				 SCOUTFS_LKF_REFRESH_INODE, inode, &lock);
@@ -518,7 +513,7 @@ static long scoutfs_ioc_stage(struct file *file, unsigned long arg)
 	}
 
 	si->staging = true;
-	current->backing_dev_info = inode_to_bdi(inode);
+	current->backing_dev_info = mapping->backing_dev_info;
 
 	pos = args.offset;
 	written = 0;
@@ -535,7 +530,7 @@ static long scoutfs_ioc_stage(struct file *file, unsigned long arg)
 out:
 	scoutfs_per_task_del(&si->pt_data_lock, &pt_ent);
 	scoutfs_unlock(sb, lock, SCOUTFS_LOCK_WRITE);
-	inode_unlock(inode);
+	mutex_unlock(&inode->i_mutex);
 	mnt_drop_write_file(file);
 
 	trace_scoutfs_ioc_stage_ret(sb, scoutfs_ino(inode), ret);
@@ -545,17 +540,19 @@ out:
 static long scoutfs_ioc_stat_more(struct file *file, unsigned long arg)
 {
 	struct inode *inode = file_inode(file);
-	struct scoutfs_inode_info *si = SCOUTFS_I(inode);
 	struct scoutfs_ioctl_stat_more stm;
 
+	if (get_user(stm.valid_bytes, (__u64 __user *)arg))
+		return -EFAULT;
+
+	stm.valid_bytes = min_t(u64, stm.valid_bytes,
+				sizeof(struct scoutfs_ioctl_stat_more));
 	stm.meta_seq = scoutfs_inode_meta_seq(inode);
 	stm.data_seq = scoutfs_inode_data_seq(inode);
 	stm.data_version = scoutfs_inode_data_version(inode);
 	scoutfs_inode_get_onoff(inode, &stm.online_blocks, &stm.offline_blocks);
-	stm.crtime_sec = si->crtime.tv_sec;
-	stm.crtime_nsec = si->crtime.tv_nsec;
 
-	if (copy_to_user((void __user *)arg, &stm, sizeof(stm)))
+	if (copy_to_user((void __user *)arg, &stm, stm.valid_bytes))
 		return -EFAULT;
 
 	return 0;
@@ -619,7 +616,6 @@ static long scoutfs_ioc_data_waiting(struct file *file, unsigned long arg)
 static long scoutfs_ioc_setattr_more(struct file *file, unsigned long arg)
 {
 	struct inode *inode = file->f_inode;
-	struct scoutfs_inode_info *si = SCOUTFS_I(inode);
 	struct super_block *sb = inode->i_sb;
 	struct scoutfs_ioctl_setattr_more __user *usm = (void __user *)arg;
 	struct scoutfs_ioctl_setattr_more sm;
@@ -654,7 +650,7 @@ static long scoutfs_ioc_setattr_more(struct file *file, unsigned long arg)
 	if (ret)
 		goto out;
 
-	inode_lock(inode);
+	mutex_lock(&inode->i_mutex);
 
 	ret = scoutfs_lock_inode(sb, SCOUTFS_LOCK_WRITE,
 				 SCOUTFS_LKF_REFRESH_INODE, inode, &lock);
@@ -678,7 +674,7 @@ static long scoutfs_ioc_setattr_more(struct file *file, unsigned long arg)
 
 	/* setting only so we don't see 0 data seq with nonzero data_version */
 	set_data_seq = sm.data_version != 0 ? true : false;
-	ret = scoutfs_inode_index_lock_hold(inode, &ind_locks, set_data_seq, false);
+	ret = scoutfs_inode_index_lock_hold(inode, &ind_locks, set_data_seq);
 	if (ret)
 		goto unlock;
 
@@ -688,8 +684,6 @@ static long scoutfs_ioc_setattr_more(struct file *file, unsigned long arg)
 		i_size_write(inode, sm.i_size);
 	inode->i_ctime.tv_sec = sm.ctime_sec;
 	inode->i_ctime.tv_nsec = sm.ctime_nsec;
-	si->crtime.tv_sec = sm.crtime_sec;
-	si->crtime.tv_nsec = sm.crtime_nsec;
 
 	scoutfs_update_inode_item(inode, lock, &ind_locks);
 	ret = 0;
@@ -698,7 +692,7 @@ static long scoutfs_ioc_setattr_more(struct file *file, unsigned long arg)
 unlock:
 	scoutfs_inode_index_unlock(sb, &ind_locks);
 	scoutfs_unlock(sb, lock, SCOUTFS_LOCK_WRITE);
-	inode_unlock(inode);
+	mutex_unlock(&inode->i_mutex);
 	mnt_drop_write_file(file);
 out:
 
@@ -872,35 +866,28 @@ static long scoutfs_ioc_statfs_more(struct file *file, unsigned long arg)
 {
 	struct super_block *sb = file_inode(file)->i_sb;
 	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-	struct scoutfs_super_block *super;
+	struct scoutfs_super_block *super = &sbi->super;
 	struct scoutfs_ioctl_statfs_more sfm;
 	int ret;
 
-	super = kzalloc(sizeof(struct scoutfs_super_block), GFP_NOFS);
-	if (!super)
-		return -ENOMEM;
-
-	ret = scoutfs_read_super(sb, super);
-	if (ret)
-		goto out;
+	if (get_user(sfm.valid_bytes, (__u64 __user *)arg))
+		return -EFAULT;
 
+	sfm.valid_bytes = min_t(u64, sfm.valid_bytes,
+				sizeof(struct scoutfs_ioctl_statfs_more));
 	sfm.fsid = le64_to_cpu(super->hdr.fsid);
 	sfm.rid = sbi->rid;
 	sfm.total_meta_blocks = le64_to_cpu(super->total_meta_blocks);
 	sfm.total_data_blocks = le64_to_cpu(super->total_data_blocks);
-	sfm.reserved_meta_blocks = scoutfs_server_reserved_meta_blocks(sb);
 
 	ret = scoutfs_client_get_last_seq(sb, &sfm.committed_seq);
 	if (ret)
-		goto out;
+		return ret;
 
-	if (copy_to_user((void __user *)arg, &sfm, sizeof(sfm)))
-		ret = -EFAULT;
-	else
-		ret = 0;
-out:
-	kfree(super);
-	return ret;
+	if (copy_to_user((void __user *)arg, &sfm, sfm.valid_bytes))
+		return -EFAULT;
+
+	return 0;
 }
 
 struct copy_alloc_detail_args {
@@ -985,18 +972,12 @@ static long scoutfs_ioc_move_blocks(struct file *file, unsigned long arg)
 		goto out;
 	}
 
-	if (mb.flags & SCOUTFS_IOC_MB_UNKNOWN) {
-		ret = -EINVAL;
-		goto out;
-	}
-
 	ret = mnt_want_write_file(file);
 	if (ret < 0)
 		goto out;
 
 	ret = scoutfs_data_move_blocks(from, mb.from_off, mb.len,
-				       to, mb.to_off, !!(mb.flags & SCOUTFS_IOC_MB_STAGE),
-				       mb.data_version);
+				       to, mb.to_off);
 	mnt_drop_write_file(file);
 out:
 	fput(from_file);
@@ -1004,506 +985,6 @@ out:
 	return ret;
 }
 
-static long scoutfs_ioc_resize_devices(struct file *file, unsigned long arg)
-{
-	struct super_block *sb = file_inode(file)->i_sb;
-	struct scoutfs_ioctl_resize_devices __user *urd = (void __user *)arg;
-	struct scoutfs_ioctl_resize_devices rd;
-	struct scoutfs_net_resize_devices nrd;
-	int ret;
-
-	if (!(file->f_mode & FMODE_READ)) {
-		ret = -EBADF;
-		goto out;
-	}
-
-	if (!capable(CAP_SYS_ADMIN)) {
-		ret = -EPERM;
-		goto out;
-	}
-
-	if (copy_from_user(&rd, urd, sizeof(rd))) {
-		ret = -EFAULT;
-		goto out;
-	}
-
-	nrd.new_total_meta_blocks = cpu_to_le64(rd.new_total_meta_blocks);
-	nrd.new_total_data_blocks = cpu_to_le64(rd.new_total_data_blocks);
-
-	ret = scoutfs_client_resize_devices(sb, &nrd);
-out:
-	return ret;
-}
-
-struct xattr_total_entry {
-	struct rb_node node;
-	struct scoutfs_ioctl_xattr_total xt;
-	u64 fs_seq;
-	u64 fs_total;
-	u64 fs_count;
-	u64 fin_seq;
-	u64 fin_total;
-	s64 fin_count;
-	u64 log_seq;
-	u64 log_total;
-	s64 log_count;
-};
-
-static int cmp_xt_entry_name(const struct xattr_total_entry *a,
-			     const struct xattr_total_entry *b)
-
-{
-	return scoutfs_cmp_u64s(a->xt.name[0], b->xt.name[0]) ?:
-	       scoutfs_cmp_u64s(a->xt.name[1], b->xt.name[1]) ?:
-	       scoutfs_cmp_u64s(a->xt.name[2], b->xt.name[2]);
-}
-
-/*
- * Record the contribution of the three classes of logged items we can
- * see: the item in the fs_root, items from finalized log btrees, and
- * items from active log btrees.  Once we have the full set the caller
- * can decide which of the items contribute to the total it sends to the
- * user.
- */
-static int read_xattr_total_item(struct super_block *sb, struct scoutfs_key *key,
-				 u64 seq, u8 flags, void *val, int val_len, int fic, void *arg)
-{
-	struct scoutfs_xattr_totl_val *tval = val;
-	struct xattr_total_entry *ent;
-	struct xattr_total_entry rd;
-	struct rb_root *root = arg;
-	struct rb_node *parent;
-	struct rb_node **node;
-	int cmp;
-
-	rd.xt.name[0] = le64_to_cpu(key->skxt_a);
-	rd.xt.name[1] = le64_to_cpu(key->skxt_b);
-	rd.xt.name[2] = le64_to_cpu(key->skxt_c);
-
-	/* find entry matching name */
-	node = &root->rb_node;
-	parent = NULL;
-	cmp = -1;
-	while (*node) {
-		parent = *node;
-		ent = container_of(*node, struct xattr_total_entry, node);
-
-		/* sort merge items by key then newest to oldest */
-		cmp = cmp_xt_entry_name(&rd, ent);
-		if (cmp < 0)
-			node = &(*node)->rb_left;
-		else if (cmp > 0)
-			node = &(*node)->rb_right;
-		else
-			break;
-	}
-
-	/* allocate and insert new node if we need to */
-	if (cmp != 0) {
-		ent = kzalloc(sizeof(*ent), GFP_KERNEL);
-		if (!ent)
-			return -ENOMEM;
-
-		memcpy(&ent->xt.name, &rd.xt.name, sizeof(ent->xt.name));
-
-		rb_link_node(&ent->node, parent, node);
-		rb_insert_color(&ent->node, root);
-	}
-
-	if (fic & FIC_FS_ROOT) {
-		ent->fs_seq = seq;
-		ent->fs_total = le64_to_cpu(tval->total);
-		ent->fs_count = le64_to_cpu(tval->count);
-	} else if (fic & FIC_FINALIZED) {
-		ent->fin_seq = seq;
-		ent->fin_total += le64_to_cpu(tval->total);
-		ent->fin_count += le64_to_cpu(tval->count);
-	} else {
-		ent->log_seq = seq;
-		ent->log_total += le64_to_cpu(tval->total);
-		ent->log_count += le64_to_cpu(tval->count);
-	}
-
-	scoutfs_inc_counter(sb, totl_read_item);
-
-	return 0;
-}
-
-/* these are always _safe, node stores next */
-#define for_each_xt_ent(ent, node, root)					\
-	for (node = rb_first(root);						\
-	     node && (ent = rb_entry(node, struct xattr_total_entry, node),	\
-		      node = rb_next(node), 1); )
-
-#define for_each_xt_ent_reverse(ent, node, root)				\
-	for (node = rb_last(root);						\
-	     node && (ent = rb_entry(node, struct xattr_total_entry, node),	\
-		      node = rb_prev(node), 1); )
-
-static void free_xt_ent(struct rb_root *root, struct xattr_total_entry *ent)
-{
-	rb_erase(&ent->node, root);
-	kfree(ent);
-}
-
-static void free_all_xt_ents(struct rb_root *root)
-{
-	struct xattr_total_entry *ent;
-	struct rb_node *node;
-
-	for_each_xt_ent(ent, node, root)
-		free_xt_ent(root, ent);
-}
-
-/*
- * Starting from the caller's pos_name, copy the names, totals, and
- * counts for the .totl. tagged xattrs in the system sorted by their
- * name until the user's buffer is full.  This only sees xattrs that
- * have been committed.  It doesn't use locking to force commits and
- * block writers so it can be a little bit out of date with respect to
- * dirty xattrs in memory across the system.
- *
- * Our reader has to be careful because the log btree merging code can
- * write partial results to the fs_root.  This means that a reader can
- * see both cases where new finalized logs should be applied to the old
- * fs items and where old finalized logs have already been applied to
- * the partially merged fs items.  Currently active logged items are
- * always applied on top of all cases.
- *
- * These cases are differentiated with a combination of sequence numbers
- * in items, the count of contributing xattrs, and a flag
- * differentiating finalized and active logged items.  This lets us
- * recognize all cases, including when finalized logs were merged and
- * deleted the fs item.
- *
- * We're allocating a tracking struct for each totl name we see while
- * traversing the item btrees.  The forest reader is providing the items
- * it finds in leaf blocks that contain the search key.  In the worst
- * case all of these blocks are full and none of the items overlap.  At
- * most, figure order a thousand names per mount.  But in practice many
- * of these factors fall away: leaf blocks aren't fill, leaf items
- * overlap, there aren't finalized log btrees, and not all mounts are
- * actively changing totals.   We're much more likely to only read a
- * leaf block's worth of totals that have been long since merged into
- * the fs_root.
- */
-static long scoutfs_ioc_read_xattr_totals(struct file *file, unsigned long arg)
-{
-	struct super_block *sb = file_inode(file)->i_sb;
-	struct scoutfs_ioctl_read_xattr_totals __user *urxt = (void __user *)arg;
-	struct scoutfs_ioctl_read_xattr_totals rxt;
-	struct scoutfs_ioctl_xattr_total __user *uxt;
-	struct xattr_total_entry *ent;
-	struct scoutfs_key key;
-	struct scoutfs_key bloom_key;
-	struct scoutfs_key start;
-	struct scoutfs_key end;
-	struct rb_root root = RB_ROOT;
-	struct rb_node *node;
-	int count = 0;
-	int ret;
-
-	if (!(file->f_mode & FMODE_READ)) {
-		ret = -EBADF;
-		goto out;
-	}
-
-	if (!capable(CAP_SYS_ADMIN)) {
-		ret = -EPERM;
-		goto out;
-	}
-
-	if (copy_from_user(&rxt, urxt, sizeof(rxt))) {
-		ret = -EFAULT;
-		goto out;
-	}
-	uxt = (void __user *)rxt.totals_ptr;
-
-	if ((rxt.totals_ptr & (sizeof(__u64) - 1)) ||
-	    (rxt.totals_bytes < sizeof(struct scoutfs_ioctl_xattr_total))) {
-		ret = -EINVAL;
-		goto out;
-	}
-
-	scoutfs_key_set_zeros(&bloom_key);
-	bloom_key.sk_zone = SCOUTFS_XATTR_TOTL_ZONE;
-	scoutfs_xattr_init_totl_key(&start, rxt.pos_name);
-
-	while (rxt.totals_bytes >= sizeof(struct scoutfs_ioctl_xattr_total)) {
-
-		scoutfs_key_set_ones(&end);
-		end.sk_zone = SCOUTFS_XATTR_TOTL_ZONE;
-		if (scoutfs_key_compare(&start, &end) > 0)
-			break;
-
-		key = start;
-		ret = scoutfs_forest_read_items(sb, &key, &bloom_key, &start, &end,
-						read_xattr_total_item, &root);
-		if (ret < 0) {
-			if (ret == -ESTALE) {
-				free_all_xt_ents(&root);
-				continue;
-			}
-			goto out;
-		}
-
-		if (RB_EMPTY_ROOT(&root))
-			break;
-
-		/* trim totals that fall outside of the consistent range */
-		for_each_xt_ent(ent, node, &root) {
-			scoutfs_xattr_init_totl_key(&key, ent->xt.name);
-			if (scoutfs_key_compare(&key, &start) < 0) {
-				free_xt_ent(&root, ent);
-			} else {
-				break;
-			}
-		}
-		for_each_xt_ent_reverse(ent, node, &root) {
-			scoutfs_xattr_init_totl_key(&key, ent->xt.name);
-			if (scoutfs_key_compare(&key, &end) > 0) {
-				free_xt_ent(&root, ent);
-			} else {
-				break;
-			}
-		}
-
-		/* copy resulting unique non-zero totals to userspace */
-		for_each_xt_ent(ent, node, &root) {
-			if (rxt.totals_bytes < sizeof(ent->xt))
-				break;
-
-			/* start with the fs item if we have it */
-			if (ent->fs_seq != 0) {
-				ent->xt.total = ent->fs_total;
-				ent->xt.count = ent->fs_count;
-				scoutfs_inc_counter(sb, totl_read_fs);
-			}
-
-			/* apply finalized logs if they're newer or creating */
-			if (((ent->fs_seq != 0) && (ent->fin_seq > ent->fs_seq)) ||
-			    ((ent->fs_seq == 0) && (ent->fin_count > 0))) {
-				ent->xt.total += ent->fin_total;
-				ent->xt.count += ent->fin_count;
-				scoutfs_inc_counter(sb, totl_read_finalized);
-			}
-
-			/* always apply active logs which must be newer than fs and finalized */
-			if (ent->log_seq > 0) {
-				ent->xt.total += ent->log_total;
-				ent->xt.count += ent->log_count;
-				scoutfs_inc_counter(sb, totl_read_logged);
-			}
-
-			if (ent->xt.total != 0 || ent->xt.count != 0) {
-				if (copy_to_user(uxt, &ent->xt, sizeof(ent->xt))) {
-					ret = -EFAULT;
-					goto out;
-				}
-
-				uxt++;
-				rxt.totals_bytes -= sizeof(ent->xt);
-				count++;
-				scoutfs_inc_counter(sb, totl_read_copied);
-			}
-
-			free_xt_ent(&root, ent);
-		}
-
-		/* continue after the last possible key read */
-		start = end;
-		scoutfs_key_inc(&start);
-	}
-
-	ret = 0;
-out:
-	free_all_xt_ents(&root);
-
-	return ret ?: count;
-}
-
-static long scoutfs_ioc_get_allocated_inos(struct file *file, unsigned long arg)
-{
-	struct super_block *sb = file_inode(file)->i_sb;
-	struct scoutfs_ioctl_get_allocated_inos __user *ugai = (void __user *)arg;
-	struct scoutfs_ioctl_get_allocated_inos gai;
-	struct scoutfs_lock *lock = NULL;
-	struct scoutfs_key key;
-	struct scoutfs_key end;
-	u64 __user *uinos;
-	u64 bytes;
-	u64 ino;
-	int nr;
-	int ret;
-
-	if (!(file->f_mode & FMODE_READ)) {
-		ret = -EBADF;
-		goto out;
-	}
-
-	if (!capable(CAP_SYS_ADMIN)) {
-		ret = -EPERM;
-		goto out;
-	}
-
-	if (copy_from_user(&gai, ugai, sizeof(gai))) {
-		ret = -EFAULT;
-		goto out;
-	}
-
-	if ((gai.inos_ptr & (sizeof(__u64) - 1)) || (gai.inos_bytes < sizeof(__u64))) {
-		ret = -EINVAL;
-		goto out;
-	}
-
-	scoutfs_inode_init_key(&key, gai.start_ino);
-	scoutfs_inode_init_key(&end, gai.start_ino | SCOUTFS_LOCK_INODE_GROUP_MASK);
-	uinos = (void __user *)gai.inos_ptr;
-	bytes = gai.inos_bytes;
-	nr = 0;
-
-	ret = scoutfs_lock_ino(sb, SCOUTFS_LOCK_READ, 0, gai.start_ino, &lock);
-	if (ret < 0)
-		goto out;
-
-	while (bytes >= sizeof(*uinos)) {
-
-		ret = scoutfs_item_next(sb, &key, &end, NULL, 0, lock);
-		if (ret < 0) {
-			if (ret == -ENOENT)
-				ret = 0;
-			break;
-		}
-
-		if (key.sk_zone != SCOUTFS_FS_ZONE) {
-			ret = 0;
-			break;
-		}
-
-		/* all fs items are owned by allocated inodes, and _first is always ino */
-		ino = le64_to_cpu(key._sk_first);
-		if (put_user(ino, uinos)) {
-			ret = -EFAULT;
-			break;
-		}
-
-		uinos++;
-		bytes -= sizeof(*uinos);
-		if (++nr == INT_MAX)
-			break;
-
-		scoutfs_inode_init_key(&key, ino + 1);
-	}
-
-	scoutfs_unlock(sb, lock, SCOUTFS_LOCK_READ);
-out:
-	return ret ?: nr;
-}
-
-/*
- * Copy entries that point to an inode to the user's buffer.  We copy to
- * userspace from copies of the entries that are acquired under a lock
- * so that we don't fault while holding cluster locks.  It also gives us
- * a chance to limit the amount of work under each lock hold.
- */
-static long scoutfs_ioc_get_referring_entries(struct file *file, unsigned long arg)
-{
-	struct super_block *sb = file_inode(file)->i_sb;
-	struct scoutfs_ioctl_get_referring_entries gre;
-	struct scoutfs_link_backref_entry *bref = NULL;
-	struct scoutfs_link_backref_entry *bref_tmp;
-	struct scoutfs_ioctl_dirent __user *uent;
-	struct scoutfs_ioctl_dirent ent;
-	LIST_HEAD(list);
-	u64 copied;
-	int name_len;
-	int bytes;
-	long nr;
-	int ret;
-
-	if (!capable(CAP_DAC_READ_SEARCH))
-		return -EPERM;
-
-	if (copy_from_user(&gre, (void __user *)arg, sizeof(gre)))
-		return -EFAULT;
-
-	uent = (void __user *)(unsigned long)gre.entries_ptr;
-	copied = 0;
-	nr = 0;
-
-	/* use entry as cursor between calls */
-	ent.dir_ino = gre.dir_ino;
-	ent.dir_pos = gre.dir_pos;
-
-	for (;;) {
-		ret = scoutfs_dir_add_next_linkrefs(sb, gre.ino, ent.dir_ino, ent.dir_pos, 1024,
-						    &list);
-		if (ret < 0) {
-			if (ret == -ENOENT)
-				ret = 0;
-			goto out;
-		}
-
-		/* _add_next adds each entry to the head, _reverse for key order */
-		list_for_each_entry_safe_reverse(bref, bref_tmp, &list, head) {
-			list_del_init(&bref->head);
-
-			name_len = bref->name_len;
-			bytes = ALIGN(offsetof(struct scoutfs_ioctl_dirent, name[name_len + 1]),
-				      16);
-			if (copied + bytes > gre.entries_bytes) {
-				ret = -EINVAL;
-				goto out;
-			}
-
-			ent.dir_ino = bref->dir_ino;
-			ent.dir_pos = bref->dir_pos;
-			ent.ino = gre.ino;
-			ent.entry_bytes = bytes;
-			ent.flags = bref->last ? SCOUTFS_IOCTL_DIRENT_FLAG_LAST : 0;
-			ent.d_type = bref->d_type;
-			ent.name_len = name_len;
-
-			if (copy_to_user(uent, &ent, sizeof(struct scoutfs_ioctl_dirent)) ||
-			    copy_to_user(&uent->name[0], bref->dent.name, name_len) ||
-			    put_user('\0', &uent->name[name_len])) {
-				ret = -EFAULT;
-				goto out;
-			}
-
-			kfree(bref);
-			bref = NULL;
-
-			uent = (void __user *)uent + bytes;
-			copied += bytes;
-			nr++;
-
-			if (nr == LONG_MAX || (ent.flags & SCOUTFS_IOCTL_DIRENT_FLAG_LAST)) {
-				ret = 0;
-				goto out;
-			}
-		}
-
-		/* advance cursor pos from last copied entry */
-		if (++ent.dir_pos == 0) {
-			if (++ent.dir_ino == 0) {
-				ret = 0;
-				goto out;
-			}
-		}
-	}
-
-	ret = 0;
-out:
-	kfree(bref);
-	list_for_each_entry_safe(bref, bref_tmp, &list, head) {
-		list_del_init(&bref->head);
-		kfree(bref);
-	}
-
-	return nr ?: ret;
-}
-
 long scoutfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
 	switch (cmd) {
@@ -1533,14 +1014,6 @@ long scoutfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		return scoutfs_ioc_alloc_detail(file, arg);
 	case SCOUTFS_IOC_MOVE_BLOCKS:
 		return scoutfs_ioc_move_blocks(file, arg);
-	case SCOUTFS_IOC_RESIZE_DEVICES:
-		return scoutfs_ioc_resize_devices(file, arg);
-	case SCOUTFS_IOC_READ_XATTR_TOTALS:
-		return scoutfs_ioc_read_xattr_totals(file, arg);
-	case SCOUTFS_IOC_GET_ALLOCATED_INOS:
-		return scoutfs_ioc_get_allocated_inos(file, arg);
-	case SCOUTFS_IOC_GET_REFERRING_ENTRIES:
-		return scoutfs_ioc_get_referring_entries(file, arg);
 	}
 
 	return -ENOTTY;

kmod/src/ioctl.h

@@ -13,7 +13,8 @@
  * This is enforced by pahole scripting in external build environments.
  */
 
-#define SCOUTFS_IOCTL_MAGIC 0xE8  /* arbitrarily chosen hole in ioctl-number.rst */
+/* XXX I have no idea how these are chosen. */
+#define SCOUTFS_IOCTL_MAGIC 's'
 
 /*
  * Packed scoutfs keys rarely cross the ioctl boundary so we have a
@@ -87,7 +88,7 @@ enum scoutfs_ino_walk_seq_type {
  * Adds entries to the user's buffer for each inode that is found in the
  * given index between the first and last positions.
  */
-#define SCOUTFS_IOC_WALK_INODES _IOW(SCOUTFS_IOCTL_MAGIC, 1, \
+#define SCOUTFS_IOC_WALK_INODES _IOR(SCOUTFS_IOCTL_MAGIC, 1, \
 				     struct scoutfs_ioctl_walk_inodes)
 
 /*
@@ -162,11 +163,11 @@ struct scoutfs_ioctl_ino_path_result {
 	__u64 dir_pos;
 	__u16 path_bytes;
 	__u8  _pad[6];
-	__u8  path[];
+	__u8  path[0];
 };
 
 /* Get a single path from the root to the given inode number */
-#define SCOUTFS_IOC_INO_PATH _IOW(SCOUTFS_IOCTL_MAGIC, 2, \
+#define SCOUTFS_IOC_INO_PATH _IOR(SCOUTFS_IOCTL_MAGIC, 2, \
 				  struct scoutfs_ioctl_ino_path)
 
 /*
@@ -214,16 +215,23 @@ struct scoutfs_ioctl_stage {
 /*
  * Give the user inode fields that are not otherwise visible.  statx()
  * isn't always available and xattrs are relatively expensive.
+ *
+ * @valid_bytes stores the number of bytes that are valid in the
+ * structure.  The caller sets this to the size of the struct that they
+ * understand.  The kernel then fills and copies back the min of the
+ * size they and the user caller understand.  The user can tell if a
+ * field is set if all of its bytes are within the valid_bytes that the
+ * kernel set on return.
+ *
+ * New fields are only added to the end of the struct.
  */
 struct scoutfs_ioctl_stat_more {
+	__u64 valid_bytes;
 	__u64 meta_seq;
 	__u64 data_seq;
 	__u64 data_version;
 	__u64 online_blocks;
 	__u64 offline_blocks;
-	__u64 crtime_sec;
-	__u32 crtime_nsec;
-	__u8  _pad[4];
 };
 
 #define SCOUTFS_IOC_STAT_MORE _IOR(SCOUTFS_IOCTL_MAGIC, 5, \
@@ -251,16 +259,15 @@ struct scoutfs_ioctl_data_waiting {
 	__u8 _pad[6];
 };
 
-#define SCOUTFS_IOC_DATA_WAITING_FLAGS_UNKNOWN		(U64_MAX << 0)
+#define SCOUTFS_IOC_DATA_WAITING_FLAGS_UNKNOWN		(U8_MAX << 0)
 
-#define SCOUTFS_IOC_DATA_WAITING _IOW(SCOUTFS_IOCTL_MAGIC, 6, \
+#define SCOUTFS_IOC_DATA_WAITING _IOR(SCOUTFS_IOCTL_MAGIC, 6, \
 				      struct scoutfs_ioctl_data_waiting)
 
 /*
  * If i_size is set then data_version must be non-zero.  If the offline
  * flag is set then i_size must be set and a offline extent will be
- * created from offset 0 to i_size.  The time fields are always applied
- * to the inode.
+ * created from offset 0 to i_size.
  */
 struct scoutfs_ioctl_setattr_more {
 	__u64 data_version;
@@ -268,12 +275,11 @@ struct scoutfs_ioctl_setattr_more {
 	__u64 flags;
 	__u64 ctime_sec;
 	__u32 ctime_nsec;
-	__u32 crtime_nsec;
-	__u64 crtime_sec;
+	__u8 _pad[4];
 };
 
 #define SCOUTFS_IOC_SETATTR_MORE_OFFLINE		(1 << 0)
-#define SCOUTFS_IOC_SETATTR_MORE_UNKNOWN		(U64_MAX << 1)
+#define SCOUTFS_IOC_SETATTR_MORE_UNKNOWN		(U8_MAX << 1)
 
 #define SCOUTFS_IOC_SETATTR_MORE _IOW(SCOUTFS_IOCTL_MAGIC, 7, \
 				      struct scoutfs_ioctl_setattr_more)
@@ -285,8 +291,8 @@ struct scoutfs_ioctl_listxattr_hidden {
 	__u32 hash_pos;
 };
 
-#define SCOUTFS_IOC_LISTXATTR_HIDDEN _IOWR(SCOUTFS_IOCTL_MAGIC, 8, \
-					   struct scoutfs_ioctl_listxattr_hidden)
+#define SCOUTFS_IOC_LISTXATTR_HIDDEN _IOR(SCOUTFS_IOCTL_MAGIC, 8, \
+					  struct scoutfs_ioctl_listxattr_hidden)
 
 /*
  * Return the inode numbers of inodes which might contain the given
@@ -339,23 +345,32 @@ struct scoutfs_ioctl_search_xattrs {
 /* set in output_flags if returned inodes reached last_ino */
 #define SCOUTFS_SEARCH_XATTRS_OFLAG_END (1ULL << 0)
 
-#define SCOUTFS_IOC_SEARCH_XATTRS _IOW(SCOUTFS_IOCTL_MAGIC, 9, \
-				       struct scoutfs_ioctl_search_xattrs)
+#define SCOUTFS_IOC_SEARCH_XATTRS _IOR(SCOUTFS_IOCTL_MAGIC, 9, \
+				     struct scoutfs_ioctl_search_xattrs)
 
 /*
  * Give the user information about the filesystem.
  *
+ * @valid_bytes stores the number of bytes that are valid in the
+ * structure.  The caller sets this to the size of the struct that they
+ * understand.  The kernel then fills and copies back the min of the
+ * size they and the user caller understand.  The user can tell if a
+ * field is set if all of its bytes are within the valid_bytes that the
+ * kernel set on return.
+ *
  * @committed_seq: All seqs up to and including this seq have been
  * committed.  Can be compared with meta_seq and data_seq from inodes in
  * stat_more to discover if changes have been committed to disk.
+ *
+ * New fields are only added to the end of the struct.
  */
 struct scoutfs_ioctl_statfs_more {
+	__u64 valid_bytes;
 	__u64 fsid;
 	__u64 rid;
 	__u64 committed_seq;
 	__u64 total_meta_blocks;
 	__u64 total_data_blocks;
-	__u64 reserved_meta_blocks;
 };
 
 #define SCOUTFS_IOC_STATFS_MORE _IOR(SCOUTFS_IOCTL_MAGIC, 10, \
@@ -376,7 +391,7 @@ struct scoutfs_ioctl_data_wait_err {
 	__s64 err;
 };
 
-#define SCOUTFS_IOC_DATA_WAIT_ERR _IOW(SCOUTFS_IOCTL_MAGIC, 11, \
+#define SCOUTFS_IOC_DATA_WAIT_ERR _IOR(SCOUTFS_IOCTL_MAGIC, 11, \
 				       struct scoutfs_ioctl_data_wait_err)
 
 
@@ -395,7 +410,7 @@ struct scoutfs_ioctl_alloc_detail_entry {
 	__u8 __pad[6];
 };
 
-#define SCOUTFS_IOC_ALLOC_DETAIL _IOW(SCOUTFS_IOCTL_MAGIC, 12, \
+#define SCOUTFS_IOC_ALLOC_DETAIL _IOR(SCOUTFS_IOCTL_MAGIC, 12, \
 				      struct scoutfs_ioctl_alloc_detail)
 
 /*
@@ -403,13 +418,12 @@ struct scoutfs_ioctl_alloc_detail_entry {
  * on the same file system.
  *
  * from_fd specifies the source file and the ioctl is called on the
- * destination file.  Both files must have write access.  from_off specifies
- * the byte offset in the source, to_off is the byte offset in the
- * destination, and len is the number of bytes in the region to move.  All of
- * the offsets and lengths must be in multiples of 4KB, except in the case
- * where the from_off + len ends at the i_size of the source
- * file. data_version is only used when STAGE flag is set (see below).  flags
- * field is currently only used to optionally specify STAGE behavior.
+ * destination file.  Both files must have write access.  from_off
+ * specifies the byte offset in the source, to_off is the byte offset in
+ * the destination, and len is the number of bytes in the region to
+ * move.   All of the offsets and lengths must be in multiples of 4KB,
+ * except in the case where the from_off + len ends at the i_size of the
+ * source file.
  *
  * This interface only moves extents which are block granular, it does
  * not perform RMW of sub-block byte extents and it does not overwrite
@@ -421,256 +435,33 @@ struct scoutfs_ioctl_alloc_detail_entry {
  * i_size.  The i_size update will maintain final partial blocks in the
  * source.
  *
- * If STAGE flag is not set, it will return an error if either of the files
- * have offline extents.  It will return 0 when all of the extents in the
- * source region have been moved to the destination.  Moving extents updates
- * the ctime, mtime, meta_seq, data_seq, and data_version fields of both the
- * source and destination inodes.  If an error is returned then partial
+ * It will return an error if either of the files have offline extents.
+ * It will return 0 when all of the extents in the source region have
+ * been moved to the destination.  Moving extents updates the ctime,
+ * mtime, meta_seq, data_seq, and data_version fields of both the source
+ * and destination inodes.  If an error is returned then partial
  * progress may have been made and inode fields may have been updated.
  *
- * If STAGE flag is set, as above except destination range must be in an
- * offline extent. Fields are updated only for source inode.
- *
  * Errors specific to this interface include:
  *
  * EINVAL: from_off, len, or to_off aren't a multiple of 4KB; the source
  *	   and destination files are the same inode; either the source or
  *	   destination is not a regular file; the destination file has
- *	   an existing overlapping extent (if STAGE flag not set); the
- *	   destination range is not in an offline extent (if STAGE set).
+ *	   an existing overlapping extent.
  * EOVERFLOW: either from_off + len or to_off + len exceeded 64bits.
  * EBADF: from_fd isn't a valid open file descriptor.
  * EXDEV: the source and destination files are in different filesystems.
  * EISDIR: either the source or destination is a directory.
- * ENODATA: either the source or destination file have offline extents and
- *	    STAGE flag is not set.
- * ESTALE: data_version does not match destination data_version.
+ * ENODATA: either the source or destination file have offline extents.
  */
-#define SCOUTFS_IOC_MB_STAGE		(1 << 0)
-#define SCOUTFS_IOC_MB_UNKNOWN		(U64_MAX << 1)
-
 struct scoutfs_ioctl_move_blocks {
 	__u64 from_fd;
 	__u64 from_off;
 	__u64 len;
 	__u64 to_off;
-	__u64 data_version;
-	__u64 flags;
 };
 
-#define SCOUTFS_IOC_MOVE_BLOCKS _IOW(SCOUTFS_IOCTL_MAGIC, 13, \
+#define SCOUTFS_IOC_MOVE_BLOCKS _IOR(SCOUTFS_IOCTL_MAGIC, 13, \
 				     struct scoutfs_ioctl_move_blocks)
 
-struct scoutfs_ioctl_resize_devices {
-	__u64 new_total_meta_blocks;
-	__u64 new_total_data_blocks;
-};
-
-#define SCOUTFS_IOC_RESIZE_DEVICES \
-	_IOW(SCOUTFS_IOCTL_MAGIC, 14, struct scoutfs_ioctl_resize_devices)
-
-#define SCOUTFS_IOCTL_XATTR_TOTAL_NAME_NR 3
-
-/*
- * Copy global totals of .totl. xattr value payloads to the user.   This
- * only sees xattrs which have been committed and this doesn't force
- * commits of dirty data throughout the system.  This can be out of sync
- * by the amount of xattrs that can be dirty in open transactions that
- * are being built throughout the system.
- *
- * pos_name: The array name of the first total that can be returned.
- * The name is derived from the key of the xattrs that contribute to the
- * total.  For xattrs with a .totl.1.2.3 key, the pos_name[] should be
- * {1, 2, 3}.
- *
- * totals_ptr: An aligned pointer to a buffer that will be filled with
- * an array of scoutfs_ioctl_xattr_total structs for each total copied.
- *
- * totals_bytes: The size of the buffer in bytes.  There must be room
- * for at least one struct element so that returning 0 can promise that
- * there were no more totals to copy after the pos_name.
- *
- * The number of copied elements is returned and 0 is returned if there
- * were no more totals to copy after the pos_name.
- *
- * In addition to the usual errnos (EIO, EINVAL, EPERM, EFAULT) this
- * adds:
- *
- * EINVAL: The totals_ buffer was not aligned or was not large enough
- * for a single struct entry.
- */
-struct scoutfs_ioctl_read_xattr_totals {
-	__u64 pos_name[SCOUTFS_IOCTL_XATTR_TOTAL_NAME_NR];
-	__u64 totals_ptr;
-	__u64 totals_bytes;
-};
-
-/*
- * An individual total that is given to userspace.   The total is the
- * sum of all the values in the xattr payloads matching the name.  The
- * count is the number of xattrs, not number of files, contributing to
- * the total.
- */
-struct scoutfs_ioctl_xattr_total {
-	__u64 name[SCOUTFS_IOCTL_XATTR_TOTAL_NAME_NR];
-	__u64 total;
-	__u64 count;
-};
-
-#define SCOUTFS_IOC_READ_XATTR_TOTALS \
-	_IOW(SCOUTFS_IOCTL_MAGIC, 15, struct scoutfs_ioctl_read_xattr_totals)
-
-/*
- * This fills the caller's inos array with inode numbers that are in use
- * after the start ino, within an internal inode group.
- *
- * This only makes a promise about the state of the inode numbers within
- * the first and last numbers returned by one call.  At one time, all of
- * those inodes were still allocated.   They could have changed before
- * the call returned.   And any numbers outside of the first and last
- * (or single) are undefined.
- *
- * This doesn't iterate over all allocated inodes, it only probes a
- * single group that the start inode is within.   This interface was
- * first introduced to support tests that needed to find out about a
- * specific inode, while having some other similarly niche uses.   It is
- * unsuitable for a consistent iteration over all the inode numbers in
- * use.
- *
- * This test of inode items doesn't serialize with the inode lifetime
- * mechanism.   It only tells you the numbers of inodes that were once
- * active in the system and haven't yet been fully deleted.  The inode
- * numbers returned could have been in the process of being deleted and
- * were already unreachable even before the call started.
- *
- * @start_ino: the first inode number that could be returned
- * @inos_ptr: pointer to an aligned array of 64bit inode numbers
- * @inos_bytes: the number of bytes available in the inos_ptr array
- *
- * Returns errors or the count of inode numbers returned, quite possibly
- * including 0.
- */
-struct scoutfs_ioctl_get_allocated_inos {
-	__u64 start_ino;
-	__u64 inos_ptr;
-	__u64 inos_bytes;
-};
-
-#define SCOUTFS_IOC_GET_ALLOCATED_INOS \
-	_IOW(SCOUTFS_IOCTL_MAGIC, 16, struct scoutfs_ioctl_get_allocated_inos)
-
-/*
- * Get directory entries that refer to a specific inode.
- *
- * @ino: The target ino that we're finding referring entries to.
- * Constant across all the calls that make up an iteration over all the
- * inode's entries.
- *
- * @dir_ino: The inode number of a directory containing the entry to our
- * inode to search from.  If this parent directory contains no more
- * entries to our inode then we'll search through other parent directory
- * inodes in inode order.
- *
- * @dir_pos: The position in the dir_ino parent directory of the entry
- * to our inode to search from.  If there is no entry at this position
- * then we'll search through other entry positions in increasing order.
- * If we exhaust the parent directory then we'll search through
- * additional parent directories in inode order.
- *
- * @entries_ptr: A pointer to the buffer where found entries will be
- * stored.  The pointer must be aligned to 16 bytes.
- *
- * @entries_bytes: The size of the buffer that will contain entries.
- *
- * To start iterating set the desired target ino, dir_ino to 0, dir_pos
- * to 0, and set result_ptr and _bytes to a sufficiently large buffer.
- * Each entry struct that's stored in the buffer adds some overhead so a
- * large multiple of the largest possible name is a reasonable choice.
- * (A few multiples of PATH_MAX perhaps.)
- *
- * Each call returns the total number of entries that were stored in the
- * entries buffer.  Zero is returned when the search was successful and
- * no referring entries were found.  The entries can be iterated over by
- * advancing each starting struct offset by the total number of bytes in
- * each entry.  If the _LAST flag is set on an entry then there were no
- * more entries referring to the inode at the time of the call and
- * iteration can be stopped.
- *
- * To resume iteration set the next call's starting dir_ino and dir_pos
- * to one past the last entry seen.  Increment the last entry's dir_pos,
- * and if it wrapped to 0, increment its dir_ino.
- *
- * This does not check that the caller has permission to read the
- * entries found in each containing directory.  It requires
- * CAP_DAC_READ_SEARCH which bypasses path traversal permissions
- * checking.
- *
- * Entries returned by a single call can reflect any combination of
- * racing creation and removal of entries.  Each entry existed at the
- * time it was read though it may have changed in the time it took to
- * return from the call.  The set of entries returned may no longer
- * reflect the current set of entries and may not have existed at the
- * same time.
- *
- * This has no knowledge of the life cycle of the inode.  It can return
- * 0 when there are no referring entries because either the target inode
- * doesn't exist, it is in the process of being deleted, or because it
- * is still open while being unlinked.
- *
- * On success this returns the number of entries filled in the buffer.
- * A return of 0 indicates that no entries referred to the inode.
- *
- * EINVAL is returned when there is a problem with the buffer.  Either
- * it was not aligned or it was not large enough for the first entry.
- *
- * Many other errnos indicate hard failure to find the next entry.
- */
-struct scoutfs_ioctl_get_referring_entries {
-	__u64 ino;
-	__u64 dir_ino;
-	__u64 dir_pos;
-	__u64 entries_ptr;
-	__u64 entries_bytes;
-};
-
-/*
- * @dir_ino: The inode of the directory containing the entry.
- *
- * @dir_pos: The readdir f_pos position of the entry within the
- * directory.
- *
- * @ino: The inode number of the target of the entry.
- *
- * @flags: Flags associated with this entry.
- *
- * @d_type: Inode type as specified with DT_ enum values in readdir(3).
- *
- * @entry_bytes: The total bytes taken by the entry in memory, including
- * the name and any alignment padding.  The start of a following entry
- * will be found after this number of bytes.
- *
- * @name_len: The number of bytes in the name not including the trailing
- * null, ala strlen(3).
- *
- * @name: The null terminated name of the referring entry.  In the
- * struct definition this array is sized to naturally align the struct.
- * That number of padded bytes are not necessarily found in the buffer
- * returned by _get_referring_entries;
- */
-struct scoutfs_ioctl_dirent {
-	__u64 dir_ino;
-	__u64 dir_pos;
-	__u64 ino;
-	__u16 entry_bytes;
-	__u8  flags;
-	__u8  d_type;
-	__u8  name_len;
-	__u8  name[3];
-};
-
-#define SCOUTFS_IOCTL_DIRENT_FLAG_LAST (1 << 0)
-
-#define SCOUTFS_IOC_GET_REFERRING_ENTRIES \
-	_IOW(SCOUTFS_IOCTL_MAGIC, 17, struct scoutfs_ioctl_get_referring_entries)
-
 #endif

kmod/src/item.c

@@ -27,7 +27,6 @@
 #include "trans.h"
 #include "counters.h"
 #include "scoutfs_trace.h"
-#include "util.h"
 
 /*
  * The item cache maintains a consistent view of items that are read
@@ -77,10 +76,8 @@ struct item_cache_info {
 	/* almost always read, barely written */
 	struct super_block *sb;
 	struct item_percpu_pages __percpu *pcpu_pages;
-	KC_DEFINE_SHRINKER(shrinker);
-#ifdef KC_CPU_NOTIFIER
+	struct shrinker shrinker;
 	struct notifier_block notifier;
-#endif
 
 	/* often walked, but per-cpu refs are fast path */
 	rwlock_t rwlock;
@@ -98,7 +95,7 @@ struct item_cache_info {
 
 	/* written by page readers, read by shrink */
 	spinlock_t active_lock;
-	struct list_head active_list;
+	struct rb_root active_root;
 };
 
 #define DECLARE_ITEM_CACHE_INFO(sb, name) \
@@ -130,7 +127,6 @@ struct cached_page {
 	unsigned long lru_time;
 	struct list_head dirty_list;
 	struct list_head dirty_head;
-	u64 max_seq;
 	struct page *page;
 	unsigned int page_off;
 	unsigned int erased_bytes;
@@ -142,11 +138,10 @@ struct cached_item {
 	struct list_head dirty_head;
 	unsigned int dirty:1,		/* needs to be written */
 		     persistent:1,	/* in btrees, needs deletion item */
-		     deletion:1,	/* negative del item for writing */
-		     delta:1;		/* item vales are combined, freed after write */
+		     deletion:1;	/* negative del item for writing */
 	unsigned int val_len;
 	struct scoutfs_key key;
-	u64 seq;
+	struct scoutfs_log_item_value liv;
 	char val[0];
 };
 
@@ -154,8 +149,7 @@ struct cached_item {
 
 static int item_val_bytes(int val_len)
 {
-	return round_up(offsetof(struct cached_item, val[val_len]),
-			CACHED_ITEM_ALIGN);
+	return round_up(offsetof(struct cached_item, val[val_len]), CACHED_ITEM_ALIGN);
 }
 
 /*
@@ -351,8 +345,7 @@ static struct cached_page *alloc_pg(struct super_block *sb, gfp_t gfp)
 	page = alloc_page(GFP_NOFS | gfp);
 	if (!page || !pg) {
 		kfree(pg);
-		if (page)
-			__free_page(page);
+		__free_page(page);
 		return NULL;
 	}
 
@@ -390,12 +383,6 @@ static void put_pg(struct super_block *sb, struct cached_page *pg)
 	}
 }
 
-static void update_pg_max_seq(struct cached_page *pg, struct cached_item *item)
-{
-	if (item->seq > pg->max_seq)
-		pg->max_seq = item->seq;
-}
-
 /*
  * Allocate space for a new item from the free offset at the end of a
  * cached page.  This isn't a blocking allocation, and it's likely that
@@ -403,7 +390,8 @@ static void update_pg_max_seq(struct cached_page *pg, struct cached_item *item)
  * page or checking the free space first.
  */
 static struct cached_item *alloc_item(struct cached_page *pg,
-				      struct scoutfs_key *key, u64 seq, bool deletion,
+				      struct scoutfs_key *key,
+				      struct scoutfs_log_item_value *liv,
 				      void *val, int val_len)
 {
 	struct cached_item *item;
@@ -418,24 +406,22 @@ static struct cached_item *alloc_item(struct cached_page *pg,
 	INIT_LIST_HEAD(&item->dirty_head);
 	item->dirty = 0;
 	item->persistent = 0;
-	item->deletion = !!deletion;
-	item->delta = 0;
+	item->deletion = !!(liv->flags & SCOUTFS_LOG_ITEM_FLAG_DELETION);
 	item->val_len = val_len;
 	item->key = *key;
-	item->seq = seq;
+	item->liv = *liv;
 
 	if (val_len)
 		memcpy(item->val, val, val_len);
 
-	update_pg_max_seq(pg, item);
-
 	return item;
 }
 
 static void erase_item(struct cached_page *pg, struct cached_item *item)
 {
 	rbtree_erase(&item->node, &pg->item_root);
-	pg->erased_bytes += item_val_bytes(item->val_len);
+	pg->erased_bytes += round_up(item_val_bytes(item->val_len),
+				     CACHED_ITEM_ALIGN);
 }
 
 static void lru_add(struct super_block *sb, struct item_cache_info *cinf,
@@ -635,8 +621,6 @@ static void mark_item_dirty(struct super_block *sb,
 		list_add_tail(&item->dirty_head, &pg->dirty_list);
 		item->dirty = 1;
 	}
-
-	update_pg_max_seq(pg, item);
 }
 
 static void clear_item_dirty(struct super_block *sb,
@@ -688,12 +672,6 @@ static void erase_page_items(struct cached_page *pg,
  * to the dirty list after the left page, and by adding items to the
  * tail of right's dirty list in key sort order.
  *
- * The max_seq of the source page might be larger than all the items
- * while protecting an erased item from being reclaimed while an older
- * read is in flight.  We don't know where it might be in the source
- * page so we have to assume that it's in the key range being moved and
- * update the destination page's max_seq accordingly.
- *
  * The caller is responsible for page locking and managing the lru.
  */
 static void move_page_items(struct super_block *sb,
@@ -719,7 +697,7 @@ static void move_page_items(struct super_block *sb,
 		if (stop && scoutfs_key_compare(&from->key, stop) >= 0)
 			break;
 
-		to = alloc_item(right, &from->key, from->seq, from->deletion, from->val,
+		to = alloc_item(right, &from->key, &from->liv, from->val,
 				from->val_len);
 		rbtree_insert(&to->node, par, pnode, &right->item_root);
 		par = &to->node;
@@ -731,13 +709,10 @@ static void move_page_items(struct super_block *sb,
 		}
 
 		to->persistent = from->persistent;
-		to->delta = from->delta;
+		to->deletion = from->deletion;
 
 		erase_item(left, from);
 	}
-
-	if (left->max_seq > right->max_seq)
-		right->max_seq = left->max_seq;
 }
 
 enum page_intersection_type {
@@ -877,7 +852,8 @@ static void compact_page_items(struct super_block *sb,
 
 	for (from = first_item(&pg->item_root); from; from = next_item(from)) {
 		to = page_address(empty->page) + page_off;
-		page_off += item_val_bytes(from->val_len);
+		page_off += round_up(item_val_bytes(from->val_len),
+				     CACHED_ITEM_ALIGN);
 
 		/* copy the entire item, struct members and all */
 		memcpy(to, from, item_val_bytes(from->val_len));
@@ -1284,76 +1260,46 @@ static int cache_empty_page(struct super_block *sb,
 	return 0;
 }
 
-/*
- * Readers operate independently from dirty items and transactions.
- * They read a set of persistent items and insert them into the cache
- * when there aren't already pages whose key range contains the items.
- * This naturally prefers cached dirty items over stale read items.
- *
- * We have to deal with the case where dirty items are written and
- * invalidated while a read is in flight.   The reader won't have seen
- * the items that were dirty in their persistent roots as they started
- * reading.  By the time they insert their read pages the previously
- * dirty items have been reclaimed and are not in the cache.  The old
- * stale items will be inserted in their place, effectively corrupting
- * by having the dirty items disappear.
- *
- * We fix this by tracking the max seq of items in pages.  As readers
- * start they record the current transaction seq.  Invalidation skips
- * pages with a max seq greater than the first reader seq because the
- * items in the page have to stick around to prevent the readers stale
- * items from being inserted.
- *
- * This naturally only affects a small set of pages with items that were
- * written relatively recently.  If we're in memory pressure then we
- * probably have a lot of pages and they'll naturally have items that
- * were visible to any raders.  We don't bother with the complicated and
- * expensive further refinement of tracking the ranges that are being
- * read and comparing those with pages to invalidate.
- */
 struct active_reader {
-	struct list_head head;
-	u64 seq;
+	struct rb_node node;
+	struct scoutfs_key start;
+	struct scoutfs_key end;
 };
 
-#define INIT_ACTIVE_READER(rdr) \
-	struct active_reader rdr = { .head = LIST_HEAD_INIT(rdr.head) }
-
-static void add_active_reader(struct super_block *sb, struct active_reader *active)
-{
-	DECLARE_ITEM_CACHE_INFO(sb, cinf);
-
-	BUG_ON(!list_empty(&active->head));
-
-	active->seq = scoutfs_trans_sample_seq(sb);
-
-	spin_lock(&cinf->active_lock);
-	list_add_tail(&active->head, &cinf->active_list);
-	spin_unlock(&cinf->active_lock);
-}
-
-static u64 first_active_reader_seq(struct item_cache_info *cinf)
+static struct active_reader *active_rbtree_walk(struct rb_root *root,
+						struct scoutfs_key *start,
+						struct scoutfs_key *end,
+						struct rb_node **par,
+						struct rb_node ***pnode)
 {
+	struct rb_node **node = &root->rb_node;
+	struct rb_node *parent = NULL;
+	struct active_reader *ret = NULL;
 	struct active_reader *active;
-	u64 first;
+	int cmp;
 
-	/* only the calling task adds or deletes this active */
-	spin_lock(&cinf->active_lock);
-	active = list_first_entry_or_null(&cinf->active_list, struct active_reader, head);
-	first = active ? active->seq : U64_MAX;
-	spin_unlock(&cinf->active_lock);
+	while (*node) {
+		parent = *node;
+		active = container_of(*node, struct active_reader, node);
 
-	return first;
-}
-
-static void del_active_reader(struct item_cache_info *cinf, struct active_reader *active)
-{
-	/* only the calling task adds or deletes this active */
-	if (!list_empty(&active->head)) {
-		spin_lock(&cinf->active_lock);
-		list_del_init(&active->head);
-		spin_unlock(&cinf->active_lock);
+		cmp = scoutfs_key_compare_ranges(start, end, &active->start,
+						 &active->end);
+		if (cmp < 0) {
+			node = &(*node)->rb_left;
+		} else if (cmp > 0) {
+			node = &(*node)->rb_right;
+		} else {
+			ret = active;
+			node = &(*node)->rb_left;
+		}
 	}
+
+	if (par)
+		*par = parent;
+	if (pnode)
+		*pnode = node;
+
+	return ret;
 }
 
 /*
@@ -1362,16 +1308,16 @@ static void del_active_reader(struct item_cache_info *cinf, struct active_reader
  * on our root and aren't in dirty or lru lists.
  *
  * We need to store deletion items here as we read items from all the
- * btrees so that they can override older items.  The deletion items
- * will be deleted before we insert the pages into the cache.  We don't
- * insert old versions of items into the tree here so that the trees
- * don't have to compare seqs.
+ * btrees so that they can override older versions of the items.  The
+ * deletion items will be deleted before we insert the pages into the
+ * cache.  We don't insert old versions of items into the tree here so
+ * that the trees don't have to compare versions.
  */
-static int read_page_item(struct super_block *sb, struct scoutfs_key *key, u64 seq, u8 flags,
-			  void *val, int val_len, int fic, void *arg)
+static int read_page_item(struct super_block *sb, struct scoutfs_key *key,
+			  struct scoutfs_log_item_value *liv, void *val,
+			  int val_len, void *arg)
 {
 	DECLARE_ITEM_CACHE_INFO(sb, cinf);
-	const bool deletion = !!(flags & SCOUTFS_ITEM_FLAG_DELETION);
 	struct rb_root *root = arg;
 	struct cached_page *right = NULL;
 	struct cached_page *left = NULL;
@@ -1385,7 +1331,7 @@ static int read_page_item(struct super_block *sb, struct scoutfs_key *key, u64 s
 
 	pg = page_rbtree_walk(sb, root, key, key, NULL, NULL, &p_par, &p_pnode);
 	found = item_rbtree_walk(&pg->item_root, key, NULL, &par, &pnode);
-	if (found && (found->seq >= seq))
+	if (found && (le64_to_cpu(found->liv.vers) >= le64_to_cpu(liv->vers)))
 		return 0;
 
 	if (!page_has_room(pg, val_len)) {
@@ -1399,7 +1345,7 @@ static int read_page_item(struct super_block *sb, struct scoutfs_key *key, u64 s
 					 &pnode);
 	}
 
-	item = alloc_item(pg, key, seq, deletion, val, val_len);
+	item = alloc_item(pg, key, liv, val, val_len);
 	if (!item) {
 		/* simpler split of private pages, no locking/dirty/lru */
 		if (!left)
@@ -1422,7 +1368,7 @@ static int read_page_item(struct super_block *sb, struct scoutfs_key *key, u64 s
 		put_pg(sb, pg);
 
 		pg = scoutfs_key_compare(key, &left->end) <= 0 ? left : right;
-		item = alloc_item(pg, key, seq, deletion, val, val_len);
+		item = alloc_item(pg, key, liv, val, val_len);
 		found = item_rbtree_walk(&pg->item_root, key, NULL, &par,
 					 &pnode);
 
@@ -1453,20 +1399,22 @@ static int read_page_item(struct super_block *sb, struct scoutfs_key *key, u64 s
  * locks held, but without locking the cache.  The regions we read can
  * be stale with respect to the current cache, which can be read and
  * dirtied by other cluster lock holders on our node, but the cluster
- * locks protect the stable items we read.  Invalidation is careful not
- * to drop pages that have items that we couldn't see because they were
- * dirty when we started reading.
+ * locks protect the stable items we read.
  *
- * The forest item reader is reading stable trees that could be
- * overwritten.  It can return -ESTALE which we return to the caller who
- * will retry the operation and work with a new set of more recent
- * btrees.
+ * There's also the exciting case where a reader can populate the cache
+ * with stale old persistent data which was read before another local
+ * cluster lock holder was able to read, dirty, write, and then shrink
+ * the cache.  In this case the cache couldn't be cleared by lock
+ * invalidation because the caller is actively holding the lock.  But
+ * shrinking could evict the cache within the held lock.  So we record
+ * that we're an active reader in the range covered by the lock and
+ * shrink will refuse to reclaim any pages that intersect with our read.
  */
 static int read_pages(struct super_block *sb, struct item_cache_info *cinf,
 		      struct scoutfs_key *key, struct scoutfs_lock *lock)
 {
 	struct rb_root root = RB_ROOT;
-	INIT_ACTIVE_READER(active);
+	struct active_reader active;
 	struct cached_page *right = NULL;
 	struct cached_page *pg;
 	struct cached_page *rd;
@@ -1482,6 +1430,15 @@ static int read_pages(struct super_block *sb, struct item_cache_info *cinf,
 	int pgi;
 	int ret;
 
+	/* stop shrink from freeing new clean data, would let us cache stale */
+	active.start = lock->start;
+	active.end = lock->end;
+	spin_lock(&cinf->active_lock);
+	active_rbtree_walk(&cinf->active_root, &active.start, &active.end,
+		           &par, &pnode);
+	rbtree_insert(&active.node, par, pnode, &cinf->active_root);
+	spin_unlock(&cinf->active_lock);
+
 	/* start with an empty page that covers the whole lock */
 	pg = alloc_pg(sb, 0);
 	if (!pg) {
@@ -1492,12 +1449,8 @@ static int read_pages(struct super_block *sb, struct item_cache_info *cinf,
 	pg->end = lock->end;
 	rbtree_insert(&pg->node, NULL, &root.rb_node, &root);
 
-	/* set active reader seq before reading persistent roots */
-	add_active_reader(sb, &active);
-
-	start = lock->start;
-	end = lock->end;
-	ret = scoutfs_forest_read_items(sb, key, &lock->start, &start, &end, read_page_item, &root);
+	ret = scoutfs_forest_read_items(sb, lock, key, &start, &end,
+				       read_page_item, &root);
 	if (ret < 0)
 		goto out;
 
@@ -1573,7 +1526,9 @@ retry:
 
 	ret = 0;
 out:
-	del_active_reader(cinf, &active);
+	spin_lock(&cinf->active_lock);
+	rbtree_erase(&active.node, &cinf->active_root);
+	spin_unlock(&cinf->active_lock);
 
 	/* free any pages we left dangling on error */
 	for_each_page_safe(&root, rd, pg_tmp) {
@@ -1632,7 +1587,7 @@ retry:
 					       &lock->end);
 		else
 			ret = read_pages(sb, cinf, key, lock);
-		if (ret < 0 && ret != -ESTALE)
+		if (ret < 0)
 			goto out;
 		goto retry;
 	}
@@ -1679,14 +1634,6 @@ static int lock_safe(struct scoutfs_lock *lock, struct scoutfs_key *key,
 		return 0;
 }
 
-static int optional_lock_mode_match(struct scoutfs_lock *lock, int mode)
-{
-	if (WARN_ON_ONCE(lock && lock->mode != mode))
-		return -EINVAL;
-	else
-		return 0;
-}
-
 /*
  * Copy the cached item's value into the caller's value.  The number of
  * bytes copied is returned.  A null val returns 0.
@@ -1836,28 +1783,6 @@ out:
 	return ret;
 }
 
-/*
- * An item's seq is greater of the client transaction's seq and the
- * lock's write_seq.  This ensures that multiple commits in one lock
- * grant will have increasing seqs, and new locks in open commits will
- * also increase the seqs.  It lets us limit the inputs of item merging
- * to the last stable seq and ensure that all the items in open
- * transactions and granted locks will have greater seqs.
- *
- * This is a little awkward for WRITE_ONLY locks which can have much
- * older versions than the version of locked primary data that they're
- * operating on behalf of.  Callers can optionally provide that primary
- * lock to get the version from.   This ensures that items created under
- * WRITE_ONLY locks can not have versions less than their primary data.
- */
-static u64 item_seq(struct super_block *sb, struct scoutfs_lock *lock,
-		    struct scoutfs_lock *primary)
-{
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-
-	return max3(sbi->trans_seq, lock->write_seq, primary ? primary->write_seq : 0);
-}
-
 /*
  * Mark the item dirty.  Dirtying while holding a transaction pins the
  * page holding the item and guarantees that the item can be deleted or
@@ -1890,8 +1815,8 @@ int scoutfs_item_dirty(struct super_block *sb, struct scoutfs_key *key,
 	if (!item || item->deletion) {
 		ret = -ENOENT;
 	} else {
-		item->seq = item_seq(sb, lock, NULL);
 		mark_item_dirty(sb, cinf, pg, NULL, item);
+		item->liv.vers = cpu_to_le64(lock->write_version);
 		ret = 0;
 	}
 
@@ -1907,10 +1832,12 @@ out:
  */
 static int item_create(struct super_block *sb, struct scoutfs_key *key,
 		       void *val, int val_len, struct scoutfs_lock *lock,
-		       struct scoutfs_lock *primary, int mode, bool force)
+		       int mode, bool force)
 {
 	DECLARE_ITEM_CACHE_INFO(sb, cinf);
-	const u64 seq = item_seq(sb, lock, primary);
+	struct scoutfs_log_item_value liv = {
+		.vers = cpu_to_le64(lock->write_version),
+	};
 	struct cached_item *found;
 	struct cached_item *item;
 	struct cached_page *pg;
@@ -1920,8 +1847,7 @@ static int item_create(struct super_block *sb, struct scoutfs_key *key,
 
 	scoutfs_inc_counter(sb, item_create);
 
-	if ((ret = lock_safe(lock, key, mode)) ||
-	    (ret = optional_lock_mode_match(primary, SCOUTFS_LOCK_WRITE)))
+	if ((ret = lock_safe(lock, key, mode)))
 		goto out;
 
 	ret = scoutfs_forest_set_bloom_bits(sb, lock);
@@ -1939,7 +1865,7 @@ static int item_create(struct super_block *sb, struct scoutfs_key *key,
 		goto unlock;
 	}
 
-	item = alloc_item(pg, key, seq, false, val, val_len);
+	item = alloc_item(pg, key, &liv, val, val_len);
 	rbtree_insert(&item->node, par, pnode, &pg->item_root);
 	mark_item_dirty(sb, cinf, pg, NULL, item);
 
@@ -1962,15 +1888,15 @@ out:
 int scoutfs_item_create(struct super_block *sb, struct scoutfs_key *key,
 			void *val, int val_len, struct scoutfs_lock *lock)
 {
-	return item_create(sb, key, val, val_len, lock, NULL,
+	return item_create(sb, key, val, val_len, lock,
 			   SCOUTFS_LOCK_READ, false);
 }
 
 int scoutfs_item_create_force(struct super_block *sb, struct scoutfs_key *key,
 			      void *val, int val_len,
-			      struct scoutfs_lock *lock, struct scoutfs_lock *primary)
+			      struct scoutfs_lock *lock)
 {
-	return item_create(sb, key, val, val_len, lock, primary,
+	return item_create(sb, key, val, val_len, lock,
 			   SCOUTFS_LOCK_WRITE_ONLY, true);
 }
 
@@ -1984,7 +1910,9 @@ int scoutfs_item_update(struct super_block *sb, struct scoutfs_key *key,
 			void *val, int val_len, struct scoutfs_lock *lock)
 {
 	DECLARE_ITEM_CACHE_INFO(sb, cinf);
-	const u64 seq = item_seq(sb, lock, NULL);
+	struct scoutfs_log_item_value liv = {
+		.vers = cpu_to_le64(lock->write_version),
+	};
 	struct cached_item *item;
 	struct cached_item *found;
 	struct cached_page *pg;
@@ -2016,13 +1944,12 @@ int scoutfs_item_update(struct super_block *sb, struct scoutfs_key *key,
 		if (val_len)
 			memcpy(found->val, val, val_len);
 		if (val_len < found->val_len)
-			pg->erased_bytes += item_val_bytes(found->val_len) -
-					    item_val_bytes(val_len);
+			pg->erased_bytes += found->val_len - val_len;
 		found->val_len = val_len;
-		found->seq = seq;
+		found->liv.vers = liv.vers;
 		mark_item_dirty(sb, cinf, pg, NULL, found);
 	} else {
-		item = alloc_item(pg, key, seq, false, val, val_len);
+		item = alloc_item(pg, key, &liv, val, val_len);
 		item->persistent = found->persistent;
 		rbtree_insert(&item->node, par, pnode, &pg->item_root);
 		mark_item_dirty(sb, cinf, pg, NULL, item);
@@ -2038,81 +1965,6 @@ out:
 	return ret;
 }
 
-/*
- * Add a delta item.  Delta items are an incremental change relative to
- * the current persistent delta items.  We never have to read the
- * current items so the caller always writes with write only locks.  If
- * combining the current delta item and the caller's item results in a
- * null we can just drop it, we don't have to emit a deletion item.
- *
- * Delta items don't have to worry about creating items with old
- * versions under write_only locks.  The versions don't impact how we
- * merge two items.
- */
-int scoutfs_item_delta(struct super_block *sb, struct scoutfs_key *key,
-		       void *val, int val_len, struct scoutfs_lock *lock)
-{
-	DECLARE_ITEM_CACHE_INFO(sb, cinf);
-	const u64 seq = item_seq(sb, lock, NULL);
-	struct cached_item *item;
-	struct cached_page *pg;
-	struct rb_node **pnode;
-	struct rb_node *par;
-	int ret;
-
-	scoutfs_inc_counter(sb, item_delta);
-
-	if ((ret = lock_safe(lock, key, SCOUTFS_LOCK_WRITE_ONLY)))
-		goto out;
-
-	ret = scoutfs_forest_set_bloom_bits(sb, lock);
-	if (ret < 0)
-		goto out;
-
-	ret = get_cached_page(sb, cinf, lock, key, true, true, val_len, &pg);
-	if (ret < 0)
-		goto out;
-	__acquire(pg->rwlock);
-
-	item = item_rbtree_walk(&pg->item_root, key, NULL, &par, &pnode);
-	if (item) {
-		if (!item->delta) {
-			ret = -EIO;
-			goto unlock;
-		}
-
-		ret = scoutfs_forest_combine_deltas(key, item->val, item->val_len, val, val_len);
-		if (ret <= 0) {
-			if (ret == 0)
-				ret = -EIO;
-			goto unlock;
-		}
-
-		if (ret == SCOUTFS_DELTA_COMBINED) {
-			item->seq = seq;
-			mark_item_dirty(sb, cinf, pg, NULL, item);
-		} else if (ret == SCOUTFS_DELTA_COMBINED_NULL) {
-			clear_item_dirty(sb, cinf, pg, item);
-			erase_item(pg, item);
-		} else {
-			ret = -EIO;
-			goto unlock;
-		}
-		ret = 0;
-	} else {
-		item = alloc_item(pg, key, seq, false, val, val_len);
-		rbtree_insert(&item->node, par, pnode, &pg->item_root);
-		mark_item_dirty(sb, cinf, pg, NULL, item);
-		item->delta = 1;
-		ret = 0;
-	}
-
-unlock:
-	write_unlock(&pg->rwlock);
-out:
-	return ret;
-}
-
 /*
  * Delete an item from the cache.  We can leave behind a dirty deletion
  * item if there is a persistent item that needs to be overwritten.
@@ -2122,11 +1974,12 @@ out:
  * deletion item if there isn't one already cached.
  */
 static int item_delete(struct super_block *sb, struct scoutfs_key *key,
-		       struct scoutfs_lock *lock, struct scoutfs_lock *primary,
-		       int mode, bool force)
+		       struct scoutfs_lock *lock, int mode, bool force)
 {
 	DECLARE_ITEM_CACHE_INFO(sb, cinf);
-	const u64 seq = item_seq(sb, lock, primary);
+	struct scoutfs_log_item_value liv = {
+		.vers = cpu_to_le64(lock->write_version),
+	};
 	struct cached_item *item;
 	struct cached_page *pg;
 	struct rb_node **pnode;
@@ -2135,8 +1988,7 @@ static int item_delete(struct super_block *sb, struct scoutfs_key *key,
 
 	scoutfs_inc_counter(sb, item_delete);
 
-	if ((ret = lock_safe(lock, key, mode)) ||
-	    (ret = optional_lock_mode_match(primary, SCOUTFS_LOCK_WRITE)))
+	if ((ret = lock_safe(lock, key, mode)))
 		goto out;
 
 	ret = scoutfs_forest_set_bloom_bits(sb, lock);
@@ -2155,7 +2007,7 @@ static int item_delete(struct super_block *sb, struct scoutfs_key *key,
 	}
 
 	if (!item) {
-		item = alloc_item(pg, key, seq, false, NULL, 0);
+		item = alloc_item(pg, key, &liv, NULL, 0);
 		rbtree_insert(&item->node, par, pnode, &pg->item_root);
 	}
 
@@ -2168,10 +2020,10 @@ static int item_delete(struct super_block *sb, struct scoutfs_key *key,
 		erase_item(pg, item);
 	} else {
 		/* must emit deletion to clobber old persistent item */
-		item->seq = seq;
+		item->liv.vers = cpu_to_le64(lock->write_version);
+		item->liv.flags |= SCOUTFS_LOG_ITEM_FLAG_DELETION;
 		item->deletion = 1;
-		pg->erased_bytes += item_val_bytes(item->val_len) -
-				    item_val_bytes(0);
+		pg->erased_bytes += item->val_len;
 		item->val_len = 0;
 		mark_item_dirty(sb, cinf, pg, NULL, item);
 	}
@@ -2186,13 +2038,13 @@ out:
 int scoutfs_item_delete(struct super_block *sb, struct scoutfs_key *key,
 			struct scoutfs_lock *lock)
 {
-	return item_delete(sb, key, lock, NULL, SCOUTFS_LOCK_WRITE, false);
+	return item_delete(sb, key, lock, SCOUTFS_LOCK_WRITE, false);
 }
 
 int scoutfs_item_delete_force(struct super_block *sb, struct scoutfs_key *key,
-			      struct scoutfs_lock *lock, struct scoutfs_lock *primary)
+			      struct scoutfs_lock *lock)
 {
-	return item_delete(sb, key, lock, primary, SCOUTFS_LOCK_WRITE_ONLY, true);
+	return item_delete(sb, key, lock, SCOUTFS_LOCK_WRITE_ONLY, true);
 }
 
 u64 scoutfs_item_dirty_pages(struct super_block *sb)
@@ -2254,11 +2106,17 @@ int scoutfs_item_write_dirty(struct super_block *sb)
 	struct page *page;
 	LIST_HEAD(pages);
 	LIST_HEAD(pos);
-	u64 max_seq = 0;
+	u64 max_vers = 0;
+	int val_len;
 	int bytes;
 	int off;
 	int ret;
 
+	/* we're relying on struct layout to prepend item value headers */
+	BUILD_BUG_ON(offsetof(struct cached_item, val) !=
+		     (offsetof(struct cached_item, liv) +
+		      member_sizeof(struct cached_item, liv)));
+
 	if (atomic_read(&cinf->dirty_pages) == 0)
 		return 0;
 
@@ -2280,7 +2138,7 @@ int scoutfs_item_write_dirty(struct super_block *sb)
 		ret = -ENOMEM;
 		goto out;
 	}
-	list_add(&page->lru, &pages);
+	list_add(&page->list, &pages);
 
 	first = NULL;
 	prev = &first;
@@ -2293,7 +2151,7 @@ int scoutfs_item_write_dirty(struct super_block *sb)
 				ret = -ENOMEM;
 				goto out;
 			}
-			list_add(&second->lru, &pages);
+			list_add(&second->list, &pages);
 		}
 
 		/* read lock next sorted page, we're only dirty_list user */
@@ -2310,9 +2168,10 @@ int scoutfs_item_write_dirty(struct super_block *sb)
 		list_sort(NULL, &pg->dirty_list, cmp_item_key);
 
 		list_for_each_entry(item, &pg->dirty_list, dirty_head) {
+			val_len = sizeof(item->liv) + item->val_len;
 			bytes = offsetof(struct scoutfs_btree_item_list,
-					 val[item->val_len]);
-			max_seq = max(max_seq, item->seq);
+					 val[val_len]);
+			max_vers = max(max_vers, le64_to_cpu(item->liv.vers));
 
 			if (off + bytes > PAGE_SIZE) {
 				page = second;
@@ -2328,10 +2187,8 @@ int scoutfs_item_write_dirty(struct super_block *sb)
 			prev = &lst->next;
 
 			lst->key = item->key;
-			lst->seq = item->seq;
-			lst->flags = item->deletion ? SCOUTFS_ITEM_FLAG_DELETION : 0;
-			lst->val_len = item->val_len;
-			memcpy(lst->val, item->val, item->val_len);
+			lst->val_len = val_len;
+			memcpy(lst->val, &item->liv, val_len);
 		}
 
 		spin_lock(&cinf->dirty_lock);
@@ -2344,14 +2201,14 @@ int scoutfs_item_write_dirty(struct super_block *sb)
 		read_unlock(&pg->rwlock);
 	}
 
-	/* store max item seq in forest's log_trees */
-	scoutfs_forest_set_max_seq(sb, max_seq);
+	/* store max item vers in forest's log_trees */
+	scoutfs_forest_set_max_vers(sb, max_vers);
 
 	/* write all the dirty items into log btree blocks */
 	ret = scoutfs_forest_insert_list(sb, first);
 out:
-	list_for_each_entry_safe(page, second, &pages, lru) {
-		list_del_init(&page->lru);
+	list_for_each_entry_safe(page, second, &pages, list) {
+		list_del_init(&page->list);
 		__free_page(page);
 	}
 
@@ -2389,11 +2246,8 @@ retry:
 					 dirty_head) {
 			clear_item_dirty(sb, cinf, pg, item);
 
-			if (item->delta)
-				scoutfs_inc_counter(sb, item_delta_written);
-
 			/* free deletion items */
-			if (item->deletion || item->delta)
+			if (item->deletion)
 				erase_item(pg, item);
 			else
 				item->persistent = 1;
@@ -2533,45 +2387,39 @@ retry:
 	put_pg(sb, right);
 }
 
-static unsigned long item_cache_count_objects(struct shrinker *shrink,
-					      struct shrink_control *sc)
-{
-	struct item_cache_info *cinf = KC_SHRINKER_CONTAINER_OF(shrink, struct item_cache_info);
-	struct super_block *sb = cinf->sb;
-
-	scoutfs_inc_counter(sb, item_cache_count_objects);
-
-	return shrinker_min_long(cinf->lru_pages);
-}
-
 /*
  * Shrink the size the item cache.  We're operating against the fast
- * path lock ordering and we skip pages if we can't acquire locks.  We
- * can run into dirty pages or pages with items that weren't visible to
- * the earliest active reader which must be skipped.
+ * path lock ordering and we skip pages if we can't acquire locks.
+ * Similarly, we can run into dirty pages or pages which intersect with
+ * active readers that we can't shrink and also choose to skip.
  */
-static unsigned long item_cache_scan_objects(struct shrinker *shrink,
-					     struct shrink_control *sc)
+static int item_lru_shrink(struct shrinker *shrink,
+			   struct shrink_control *sc)
 {
-	struct item_cache_info *cinf = KC_SHRINKER_CONTAINER_OF(shrink, struct item_cache_info);
+	struct item_cache_info *cinf = container_of(shrink,
+						    struct item_cache_info,
+						    shrinker);
 	struct super_block *sb = cinf->sb;
+	struct active_reader *active;
 	struct cached_page *tmp;
 	struct cached_page *pg;
-	unsigned long freed = 0;
-	u64 first_reader_seq;
-	int nr = sc->nr_to_scan;
+	int nr;
 
-	scoutfs_inc_counter(sb, item_cache_scan_objects);
-
-	/* can't invalidate pages with items that weren't visible to first reader */
-	first_reader_seq = first_active_reader_seq(cinf);
+	if (sc->nr_to_scan == 0)
+		goto out;
+	nr = sc->nr_to_scan;
 
 	write_lock(&cinf->rwlock);
 	spin_lock(&cinf->lru_lock);
 
 	list_for_each_entry_safe(pg, tmp, &cinf->lru_list, lru_head) {
 
-		if (first_reader_seq <= pg->max_seq) {
+		/* can't invalidate ranges being read, reader might be stale */
+		spin_lock(&cinf->active_lock);
+		active = active_rbtree_walk(&cinf->active_root, &pg->start,
+					    &pg->end, NULL, NULL);
+		spin_unlock(&cinf->active_lock);
+		if (active) {
 			scoutfs_inc_counter(sb, item_shrink_page_reader);
 			continue;
 		}
@@ -2593,7 +2441,6 @@ static unsigned long item_cache_scan_objects(struct shrinker *shrink,
 		rbtree_erase(&pg->node, &cinf->pg_root);
 		invalidate_pcpu_page(pg);
 		write_unlock(&pg->rwlock);
-		freed++;
 
 		put_pg(sb, pg);
 
@@ -2603,11 +2450,10 @@ static unsigned long item_cache_scan_objects(struct shrinker *shrink,
 
 	write_unlock(&cinf->rwlock);
 	spin_unlock(&cinf->lru_lock);
-
-	return freed;
+out:
+	return min_t(unsigned long, cinf->lru_pages, INT_MAX);
 }
 
-#ifdef KC_CPU_NOTIFIER
 static int item_cpu_callback(struct notifier_block *nfb,
 			     unsigned long action, void *hcpu)
 {
@@ -2622,7 +2468,6 @@ static int item_cpu_callback(struct notifier_block *nfb,
 
 	return NOTIFY_OK;
 }
-#endif
 
 int scoutfs_item_setup(struct super_block *sb)
 {
@@ -2643,7 +2488,7 @@ int scoutfs_item_setup(struct super_block *sb)
 	spin_lock_init(&cinf->lru_lock);
 	INIT_LIST_HEAD(&cinf->lru_list);
 	spin_lock_init(&cinf->active_lock);
-	INIT_LIST_HEAD(&cinf->active_list);
+	cinf->active_root = RB_ROOT;
 
 	cinf->pcpu_pages = alloc_percpu(struct item_percpu_pages);
 	if (!cinf->pcpu_pages)
@@ -2652,13 +2497,11 @@ int scoutfs_item_setup(struct super_block *sb)
 	for_each_possible_cpu(cpu)
 		init_pcpu_pages(cinf, cpu);
 
-	KC_INIT_SHRINKER_FUNCS(&cinf->shrinker, item_cache_count_objects,
-			       item_cache_scan_objects);
-	KC_REGISTER_SHRINKER(&cinf->shrinker);
-#ifdef KC_CPU_NOTIFIER
+	cinf->shrinker.shrink = item_lru_shrink;
+	cinf->shrinker.seeks = DEFAULT_SEEKS;
+	register_shrinker(&cinf->shrinker);
         cinf->notifier.notifier_call = item_cpu_callback;
         register_hotcpu_notifier(&cinf->notifier);
-#endif
 
 	sbi->item_cache_info = cinf;
 	return 0;
@@ -2676,12 +2519,10 @@ void scoutfs_item_destroy(struct super_block *sb)
 	int cpu;
 
 	if (cinf) {
-		BUG_ON(!list_empty(&cinf->active_list));
+		BUG_ON(!RB_EMPTY_ROOT(&cinf->active_root));
 
-#ifdef KC_CPU_NOTIFIER
 		unregister_hotcpu_notifier(&cinf->notifier);
-#endif
-		KC_UNREGISTER_SHRINKER(&cinf->shrinker);
+		unregister_shrinker(&cinf->shrinker);
 
 		for_each_possible_cpu(cpu)
 			drop_pcpu_pages(sb, cinf, cpu);

kmod/src/item.h

@@ -15,15 +15,14 @@ int scoutfs_item_create(struct super_block *sb, struct scoutfs_key *key,
 			void *val, int val_len, struct scoutfs_lock *lock);
 int scoutfs_item_create_force(struct super_block *sb, struct scoutfs_key *key,
 			      void *val, int val_len,
-			      struct scoutfs_lock *lock, struct scoutfs_lock *primary);
+			      struct scoutfs_lock *lock);
 int scoutfs_item_update(struct super_block *sb, struct scoutfs_key *key,
 			void *val, int val_len, struct scoutfs_lock *lock);
-int scoutfs_item_delta(struct super_block *sb, struct scoutfs_key *key,
-		       void *val, int val_len, struct scoutfs_lock *lock);
 int scoutfs_item_delete(struct super_block *sb, struct scoutfs_key *key,
 			  struct scoutfs_lock *lock);
-int scoutfs_item_delete_force(struct super_block *sb, struct scoutfs_key *key,
-			      struct scoutfs_lock *lock, struct scoutfs_lock *primary);
+int scoutfs_item_delete_force(struct super_block *sb,
+				struct scoutfs_key *key,
+				struct scoutfs_lock *lock);
 
 u64 scoutfs_item_dirty_pages(struct super_block *sb);
 int scoutfs_item_write_dirty(struct super_block *sb);

kmod/src/kernelcompat.c

@@ -1,84 +0,0 @@
-
-#include <linux/uio.h>
-
-#include "kernelcompat.h"
-
-#ifdef KC_SHRINKER_SHRINK
-#include <linux/shrinker.h>
-/*
- * If a target doesn't have that .{count,scan}_objects() interface then
- * we have a .shrink() helper that performs the shrink work in terms of
- * count/scan.
- */
-int kc_shrink_wrapper_fn(struct shrinker *shrink, struct shrink_control *sc)
-{
-	struct kc_shrinker_wrapper *wrapper = container_of(shrink, struct kc_shrinker_wrapper, shrink);
-	unsigned long nr;
-	unsigned long rc;
-
-	if (sc->nr_to_scan != 0) {
-		rc = wrapper->scan_objects(shrink, sc);
-		/* translate magic values to the equivalent for older kernels */
-		if (rc == SHRINK_STOP)
-			return -1;
-		else if (rc == SHRINK_EMPTY)
-			return 0;
-	}
-
-	nr = wrapper->count_objects(shrink, sc);
-
-	return min_t(unsigned long, nr, INT_MAX);
-}
-#endif
-
-#ifndef KC_CURRENT_TIME_INODE
-struct timespec64 kc_current_time(struct inode *inode)
-{
-	struct timespec64 now;
-	unsigned gran;
-
-	getnstimeofday64(&now);
-
-	if (unlikely(!inode->i_sb)) {
-		WARN(1, "current_time() called with uninitialized super_block in the inode");
-		return now;
-	}
-
-	gran = inode->i_sb->s_time_gran;
-
-	/* Avoid division in the common cases 1 ns and 1 s. */
-	if (gran == 1) {
-		/* nothing */
-	} else if (gran == NSEC_PER_SEC) {
-		now.tv_nsec = 0;
-	} else if (gran > 1 && gran < NSEC_PER_SEC) {
-		now.tv_nsec -= now.tv_nsec % gran;
-	} else {
-		WARN(1, "illegal file time granularity: %u", gran);
-	}
-
-	return now;
-}
-#endif
-
-#ifndef KC_GENERIC_FILE_BUFFERED_WRITE
-ssize_t
-kc_generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
-			       unsigned long nr_segs, loff_t pos, loff_t *ppos,
-			       size_t count, ssize_t written)
-{
-	struct file *file = iocb->ki_filp;
-	ssize_t status;
-	struct iov_iter i;
-
-	iov_iter_init(&i, WRITE, iov, nr_segs, count);
-	status = generic_perform_write(file, &i, pos);
-
-	if (likely(status >= 0)) {
-		written += status;
-		*ppos = pos + status;
-	}
-
-	return written ? written : status;
-}
-#endif

kmod/src/kernelcompat.h

@@ -1,35 +1,8 @@
 #ifndef _SCOUTFS_KERNELCOMPAT_H_
 #define _SCOUTFS_KERNELCOMPAT_H_
 
-#include <linux/kernel.h>
-#include <linux/fs.h>
-
-/*
- * v4.15-rc3-4-gae5e165d855d
- *
- * new API for handling inode->i_version. This forces us to
- * include this API where we need. We include it here for
- * convenience instead of where it's needed.
- */
-#ifdef KC_NEED_LINUX_IVERSION_H
-#include <linux/iversion.h>
-#else
-/*
- * Kernels before above version will need to fall back to
- * manipulating inode->i_version as previous with degraded
- * methods.
- */
-#define inode_set_iversion_queried(inode, val)	\
-do {						\
-	(inode)->i_version = val;		\
-} while (0)
-#define inode_peek_iversion(inode)		\
-({						\
-	(inode)->i_version;			\
-})
-#endif
-
 #ifndef KC_ITERATE_DIR_CONTEXT
+#include <linux/fs.h>
 typedef filldir_t kc_readdir_ctx_t;
 #define KC_DECLARE_READDIR(name, file, dirent, ctx) name(file, dirent, ctx)
 #define KC_FOP_READDIR readdir
@@ -73,204 +46,4 @@ static inline int dir_emit_dots(struct file *file, void *dirent,
 }
 #endif
 
-#ifdef KC_POSIX_ACL_VALID_USER_NS
-#define kc_posix_acl_valid(user_ns, acl) posix_acl_valid(user_ns, acl)
-#else
-#define kc_posix_acl_valid(user_ns, acl) posix_acl_valid(acl)
-#endif
-
-/*
- * v3.6-rc1-24-gdbf2576e37da
- *
- * All workqueues are now non-reentrant, and the bit flag is removed
- * shortly after its uses were removed.
- */
-#ifndef WQ_NON_REENTRANT
-#define WQ_NON_REENTRANT 0
-#endif
-
-/*
- * v3.18-rc2-19-gb5ae6b15bd73
- *
- * Folds d_materialise_unique into d_splice_alias. Note reversal
- * of arguments (Also note Documentation/filesystems/porting.rst)
- */
-#ifndef KC_D_MATERIALISE_UNIQUE
-#define d_materialise_unique(dentry, inode) d_splice_alias(inode, dentry)
-#endif
-
-/*
- * v4.8-rc1-29-g31051c85b5e2
- *
- * fall back to inode_change_ok() if setattr_prepare() isn't available
- */
-#ifndef KC_SETATTR_PREPARE
-#define setattr_prepare(dentry, attr) inode_change_ok(d_inode(dentry), attr)
-#endif
-
-#ifndef KC___POSIX_ACL_CREATE
-#define __posix_acl_create posix_acl_create
-#define __posix_acl_chmod posix_acl_chmod
-#endif
-
-#ifndef KC_PERCPU_COUNTER_ADD_BATCH
-#define percpu_counter_add_batch __percpu_counter_add
-#endif
-
-#ifndef KC_MEMALLOC_NOFS_SAVE
-#define memalloc_nofs_save memalloc_noio_save
-#define memalloc_nofs_restore memalloc_noio_restore
-#endif
-
-#ifdef KC_BIO_BI_OPF
-#define kc_bio_get_opf(bio)		\
-({					\
-	(bio)->bi_opf;			\
-})
-#define kc_bio_set_opf(bio, opf)	\
-do {					\
-	(bio)->bi_opf = opf;		\
-} while (0)
-#define kc_bio_set_sector(bio, sect)	\
-do {					\
-	(bio)->bi_iter.bi_sector = sect;\
-} while (0)
-#define kc_submit_bio(bio) submit_bio(bio)
-#else
-#define kc_bio_get_opf(bio)		\
-({					\
-	(bio)->bi_rw;			\
-})
-#define kc_bio_set_opf(bio, opf)	\
-do {					\
-	(bio)->bi_rw = opf;		\
-} while (0)
-#define kc_bio_set_sector(bio, sect)	\
-do {					\
-	(bio)->bi_sector = sect;	\
-} while (0)
-#define kc_submit_bio(bio)		\
-do {					\
-	submit_bio((bio)->bi_rw, bio);	\
-} while (0)
-#define bio_set_dev(bio, bdev)		\
-do {					\
-	(bio)->bi_bdev = (bdev);	\
-} while (0)
-#endif
-
-#ifdef KC_BIO_BI_STATUS
-#define KC_DECLARE_BIO_END_IO(name, bio)	name(bio)
-#define kc_bio_get_errno(bio)			({ blk_status_to_errno((bio)->bi_status); })
-#else
-#define KC_DECLARE_BIO_END_IO(name, bio)	name(bio, int _error_arg)
-#define kc_bio_get_errno(bio)			({ (int)((void)(bio), _error_arg); })
-#endif
-
-/*
- * v4.13-rc1-6-ge462ec50cb5f
- *
- * MS_* (mount) flags from <linux/mount.h> should not be used in the kernel
- * anymore from 4.x onwards. Instead, we need to use the SB_* (superblock) flags
- */
-#ifndef SB_POSIXACL
-#define SB_POSIXACL MS_POSIXACL
-#define SB_I_VERSION MS_I_VERSION
-#endif
-
-#ifndef KC_CURRENT_TIME_INODE
-struct timespec64 kc_current_time(struct inode *inode);
-#define current_time kc_current_time
-#define kc_timespec timespec
-#else
-#define kc_timespec timespec64
-#endif
-
-#ifndef KC_SHRINKER_SHRINK
-
-#define KC_DEFINE_SHRINKER(name) struct shrinker name
-#define KC_INIT_SHRINKER_FUNCS(name, countfn, scanfn) do {	\
-	__typeof__(name) _shrink = (name);			\
-	_shrink->count_objects = (countfn);			\
-	_shrink->scan_objects = (scanfn);			\
-	_shrink->seeks = DEFAULT_SEEKS;			\
-} while (0)
-
-#define KC_SHRINKER_CONTAINER_OF(ptr, type) container_of(ptr, type, shrinker)
-#define KC_REGISTER_SHRINKER(ptr) (register_shrinker(ptr))
-#define KC_UNREGISTER_SHRINKER(ptr) (unregister_shrinker(ptr))
-#define KC_SHRINKER_FN(ptr) (ptr)
-#else
-
-#include <linux/shrinker.h>
-#ifndef SHRINK_STOP
-#define SHRINK_STOP (~0UL)
-#define SHRINK_EMPTY (~0UL - 1)
-#endif
-
-int kc_shrink_wrapper_fn(struct shrinker *shrink, struct shrink_control *sc);
-struct kc_shrinker_wrapper {
-	unsigned long (*count_objects)(struct shrinker *, struct shrink_control *sc);
-	unsigned long (*scan_objects)(struct shrinker *, struct shrink_control *sc);
-	struct shrinker shrink;
-};
-
-#define KC_DEFINE_SHRINKER(name) struct kc_shrinker_wrapper name;
-#define KC_INIT_SHRINKER_FUNCS(name, countfn, scanfn) do {	\
-	struct kc_shrinker_wrapper *_wrap = (name);		\
-	_wrap->count_objects = (countfn);			\
-	_wrap->scan_objects = (scanfn);				\
-	_wrap->shrink.shrink = kc_shrink_wrapper_fn;		\
-	_wrap->shrink.seeks = DEFAULT_SEEKS;			\
-} while (0)
-#define KC_SHRINKER_CONTAINER_OF(ptr, type) container_of(container_of(ptr, struct kc_shrinker_wrapper, shrink), type, shrinker)
-#define KC_REGISTER_SHRINKER(ptr) (register_shrinker(ptr.shrink))
-#define KC_UNREGISTER_SHRINKER(ptr) (unregister_shrinker(ptr.shrink))
-#define KC_SHRINKER_FN(ptr) (ptr.shrink)
-
-#endif /* KC_SHRINKER_SHRINK */
-
-#ifdef KC_KERNEL_GETSOCKNAME_ADDRLEN
-#include <linux/net.h>
-#include <linux/inet.h>
-static inline int kc_kernel_getsockname(struct socket *sock, struct sockaddr *addr)
-{
-	int addrlen = sizeof(struct sockaddr_in);
-	int ret = kernel_getsockname(sock, addr, &addrlen);
-	if (ret == 0 && addrlen != sizeof(struct sockaddr_in))
-		return -EAFNOSUPPORT;
-	else if (ret < 0)
-		return ret;
-
-	return sizeof(struct sockaddr_in);
-}
-static inline int kc_kernel_getpeername(struct socket *sock, struct sockaddr *addr)
-{
-	int addrlen = sizeof(struct sockaddr_in);
-	int ret = kernel_getpeername(sock, addr, &addrlen);
-	if (ret == 0 && addrlen != sizeof(struct sockaddr_in))
-		return -EAFNOSUPPORT;
-	else if (ret < 0)
-		return ret;
-
-	return sizeof(struct sockaddr_in);
-}
-#else
-#define kc_kernel_getsockname(sock, addr) kernel_getsockname(sock, addr)
-#define kc_kernel_getpeername(sock, addr) kernel_getpeername(sock, addr)
-#endif
-
-#ifdef KC_SOCK_CREATE_KERN_NET
-#define kc_sock_create_kern(family, type, proto, res) sock_create_kern(&init_net, family, type, proto, res)
-#else
-#define kc_sock_create_kern sock_create_kern
-#endif
-
-#ifndef KC_GENERIC_FILE_BUFFERED_WRITE
-ssize_t kc_generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
-               unsigned long nr_segs, loff_t pos, loff_t *ppos,
-               size_t count, ssize_t written);
-#define generic_file_buffered_write kc_generic_file_buffered_write
-#endif
-
 #endif

kmod/src/key.h

@@ -108,16 +108,6 @@ static inline void scoutfs_key_set_ones(struct scoutfs_key *key)
 	memset(key->__pad, 0, sizeof(key->__pad));
 }
 
-static inline bool scoutfs_key_is_ones(struct scoutfs_key *key)
-{
-	return key->sk_zone == U8_MAX &&
-	       key->_sk_first == cpu_to_le64(U64_MAX) &&
-	       key->sk_type == U8_MAX &&
-	       key->_sk_second == cpu_to_le64(U64_MAX) &&
-	       key->_sk_third == cpu_to_le64(U64_MAX) &&
-	       key->_sk_fourth == U8_MAX;
-}
-
 /*
  * Return a -1/0/1 comparison of keys.
  *

kmod/src/lock.c

@@ -12,12 +12,12 @@
  */
 #include <linux/kernel.h>
 #include <linux/fs.h>
+#include <linux/preempt_mask.h> /* a rhel shed.h needed preempt_offset? */
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/mm.h>
 #include <linux/sort.h>
 #include <linux/ctype.h>
-#include <linux/posix_acl.h>
 
 #include "super.h"
 #include "lock.h"
@@ -34,8 +34,6 @@
 #include "data.h"
 #include "xattr.h"
 #include "item.h"
-#include "omap.h"
-#include "util.h"
 
 /*
  * scoutfs uses a lock service to manage item cache consistency between
@@ -67,6 +65,8 @@
  * relative to that lock state we resend.
  */
 
+#define GRACE_PERIOD_KT	ms_to_ktime(10)
+
 /*
  * allocated per-super, freed on unmount.
  */
@@ -74,19 +74,19 @@ struct lock_info {
 	struct super_block *sb;
 	spinlock_t lock;
 	bool shutdown;
-	bool unmounting;
 	struct rb_root lock_tree;
 	struct rb_root lock_range_tree;
-	KC_DEFINE_SHRINKER(shrinker);
+	struct shrinker shrinker;
 	struct list_head lru_list;
 	unsigned long long lru_nr;
 	struct workqueue_struct *workq;
-	struct work_struct inv_work;
+	struct work_struct grant_work;
+	struct list_head grant_list;
+	struct delayed_work inv_dwork;
 	struct list_head inv_list;
 	struct work_struct shrink_work;
 	struct list_head shrink_list;
 	atomic64_t next_refresh_gen;
-
 	struct dentry *tseq_dentry;
 	struct scoutfs_tseq_tree tseq_tree;
 };
@@ -122,37 +122,21 @@ static bool lock_modes_match(int granted, int requested)
 }
 
 /*
- * Invalidate cached data associated with an inode whose lock is going
+ * invalidate cached data associated with an inode whose lock is going
  * away.
- *
- * We try to drop cached dentries and inodes covered by the lock if they
- * aren't referenced.  This removes them from the mount's open map and
- * allows deletions to be performed by unlink without having to wait for
- * remote cached inodes to be dropped.
- *
- * We kick the d_prune and iput off to async work because they can end
- * up in final iput and inode eviction item deletion which would
- * deadlock.   d_prune->dput can end up in iput on parents in different
- * locks entirely.
  */
 static void invalidate_inode(struct super_block *sb, u64 ino)
 {
-	struct scoutfs_inode_info *si;
 	struct inode *inode;
 
-	inode = scoutfs_ilookup_nowait_nonewfree(sb, ino);
+	inode = scoutfs_ilookup(sb, ino);
 	if (inode) {
-		si = SCOUTFS_I(inode);
-
 		scoutfs_inc_counter(sb, lock_invalidate_inode);
 		if (S_ISREG(inode->i_mode)) {
 			truncate_inode_pages(inode->i_mapping, 0);
 			scoutfs_data_wait_changed(inode);
 		}
-
-		forget_all_cached_acls(inode);
-
-		scoutfs_inode_queue_iput(inode, SI_IPUT_FLAG_PRUNE);
+		iput(inode);
 	}
 }
 
@@ -203,7 +187,6 @@ retry:
 		}
 		spin_unlock(&lock->cov_list_lock);
 
-		/* invalidate inodes after removing coverage so drop/evict aren't covered */
 		if (lock->start.sk_zone == SCOUTFS_FS_ZONE) {
 			ino = le64_to_cpu(lock->start.ski_ino);
 			last = le64_to_cpu(lock->end.ski_ino);
@@ -241,11 +224,11 @@ static void lock_free(struct lock_info *linfo, struct scoutfs_lock *lock)
 	BUG_ON(!RB_EMPTY_NODE(&lock->node));
 	BUG_ON(!RB_EMPTY_NODE(&lock->range_node));
 	BUG_ON(!list_empty(&lock->lru_head));
+	BUG_ON(!list_empty(&lock->grant_head));
 	BUG_ON(!list_empty(&lock->inv_head));
 	BUG_ON(!list_empty(&lock->shrink_head));
 	BUG_ON(!list_empty(&lock->cov_list));
 
-	kfree(lock->inode_deletion_data);
 	kfree(lock);
 }
 
@@ -268,8 +251,8 @@ static struct scoutfs_lock *lock_alloc(struct super_block *sb,
 	RB_CLEAR_NODE(&lock->node);
 	RB_CLEAR_NODE(&lock->range_node);
 	INIT_LIST_HEAD(&lock->lru_head);
+	INIT_LIST_HEAD(&lock->grant_head);
 	INIT_LIST_HEAD(&lock->inv_head);
-	INIT_LIST_HEAD(&lock->inv_list);
 	INIT_LIST_HEAD(&lock->shrink_head);
 	spin_lock_init(&lock->cov_list_lock);
 	INIT_LIST_HEAD(&lock->cov_list);
@@ -279,7 +262,6 @@ static struct scoutfs_lock *lock_alloc(struct super_block *sb,
 	lock->sb = sb;
 	init_waitqueue_head(&lock->waitq);
 	lock->mode = SCOUTFS_LOCK_NULL;
-	lock->invalidating_mode = SCOUTFS_LOCK_NULL;
 
 	atomic64_set(&lock->forest_bloom_nr, 0);
 
@@ -316,6 +298,23 @@ static bool lock_counts_match(int granted, unsigned int *counts)
 	return true;
 }
 
+/*
+ * Returns true if there are any mode counts that match with the desired
+ * mode.  There can be other non-matching counts as well but we're only
+ * testing for the existence of any matching counts.
+ */
+static bool lock_count_match_exists(int desired, unsigned int *counts)
+{
+	enum scoutfs_lock_mode mode;
+
+	for (mode = 0; mode < SCOUTFS_LOCK_NR_MODES; mode++) {
+		if (counts[mode] && lock_modes_match(desired, mode))
+			return true;
+	}
+
+	return false;
+}
+
 /*
  * An idle lock has nothing going on.  It can be present in the lru and
  * can be freed by the final put when it has a null mode.
@@ -533,15 +532,45 @@ static void put_lock(struct lock_info *linfo,struct scoutfs_lock *lock)
 }
 
 /*
- * The caller has made a change (set a lock mode) which can let one of the
- * invalidating locks make forward progress.
+ * Locks have a grace period that extends after activity and prevents
+ * invalidation.  It's intended to let nodes do reasonable batches of
+ * work as locks ping pong between nodes that are doing conflicting
+ * work.
+ */
+static void extend_grace(struct super_block *sb, struct scoutfs_lock *lock)
+{
+	ktime_t now = ktime_get();
+
+	if (ktime_after(now, lock->grace_deadline))
+		scoutfs_inc_counter(sb, lock_grace_set);
+	else
+		scoutfs_inc_counter(sb, lock_grace_extended);
+
+	lock->grace_deadline = ktime_add(now, GRACE_PERIOD_KT);
+}
+
+static void queue_grant_work(struct lock_info *linfo)
+{
+	assert_spin_locked(&linfo->lock);
+
+	if (!list_empty(&linfo->grant_list) && !linfo->shutdown)
+		queue_work(linfo->workq, &linfo->grant_work);
+}
+
+/*
+ * We immediately queue work on the assumption that the caller might
+ * have made a change (set a lock mode) which can let one of the
+ * invalidating locks make forward progress, even if other locks are
+ * waiting for their grace period to elapse.  It's a trade-off between
+ * invalidation latency and burning cpu repeatedly finding that locks
+ * are still in their grace period.
  */
 static void queue_inv_work(struct lock_info *linfo)
 {
 	assert_spin_locked(&linfo->lock);
 
-	if (!list_empty(&linfo->inv_list))
-		queue_work(linfo->workq, &linfo->inv_work);
+	if (!list_empty(&linfo->inv_list) && !linfo->shutdown)
+		mod_delayed_work(linfo->workq, &linfo->inv_dwork, 0);
 }
 
 /*
@@ -589,17 +618,80 @@ static void bug_on_inconsistent_grant_cache(struct super_block *sb,
 }
 
 /*
- * The client is receiving a grant response message from the server.
- * This is being called synchronously in the networking receive path so
- * our work should be quick and reasonably non-blocking.
+ * Each lock has received a grant response message from the server.
  *
- * The server's state machine can immediately send an invalidate request
- * after sending this grant response.   We won't process the incoming
- * invalidate request until after processing this grant response.
+ * Grant responses can be reordered with incoming invalidation requests
+ * from the server so we have to be careful to only set the new mode
+ * once the old mode matches.
+ *
+ * We extend the grace period as we grant the lock if there is a waiting
+ * locker who can use the lock.  This stops invalidation from pulling
+ * the granted lock out from under the requester, resulting in a lot of
+ * churn with no forward progress.  Using the grace period avoids having
+ * to identify a specific waiter and give it an acquired lock.  It's
+ * also very similar to waking up the locker and having it win the race
+ * against the invalidation.  In that case they'd extend the grace
+ * period anyway as they unlock.
+ */
+static void lock_grant_worker(struct work_struct *work)
+{
+	struct lock_info *linfo = container_of(work, struct lock_info,
+					       grant_work);
+	struct super_block *sb = linfo->sb;
+	struct scoutfs_net_lock_grant_response *gr;
+	struct scoutfs_net_lock *nl;
+	struct scoutfs_lock *lock;
+	struct scoutfs_lock *tmp;
+
+	scoutfs_inc_counter(sb, lock_grant_work);
+
+	spin_lock(&linfo->lock);
+
+	list_for_each_entry_safe(lock, tmp, &linfo->grant_list, grant_head) {
+		gr = &lock->grant_resp;
+		nl = &lock->grant_resp.nl;
+
+		/* wait for reordered invalidation to finish */
+		if (lock->mode != nl->old_mode)
+			continue;
+
+		bug_on_inconsistent_grant_cache(sb, lock, nl->old_mode,
+						nl->new_mode);
+
+		if (!lock_mode_can_read(nl->old_mode) &&
+		    lock_mode_can_read(nl->new_mode)) {
+			lock->refresh_gen =
+				atomic64_inc_return(&linfo->next_refresh_gen);
+		}
+
+		lock->request_pending = 0;
+		lock->mode = nl->new_mode;
+		lock->write_version = le64_to_cpu(nl->write_version);
+		lock->roots = gr->roots;
+
+		if (lock_count_match_exists(nl->new_mode, lock->waiters))
+			extend_grace(sb, lock);
+
+		trace_scoutfs_lock_granted(sb, lock);
+		list_del_init(&lock->grant_head);
+		wake_up(&lock->waitq);
+		put_lock(linfo, lock);
+	}
+
+	/* invalidations might be waiting for our reordered grant */
+	queue_inv_work(linfo);
+	spin_unlock(&linfo->lock);
+}
+
+/*
+ * The client is receiving a grant response message from the server.  We
+ * find the lock, record the response, and add it to the list for grant
+ * work to process.
  */
 int scoutfs_lock_grant_response(struct super_block *sb,
-				struct scoutfs_net_lock *nl)
+				struct scoutfs_net_lock_grant_response *gr)
 {
+	struct scoutfs_net_lock *nl = &gr->nl;
 	DECLARE_LOCK_INFO(sb, linfo);
 	struct scoutfs_lock *lock;
 
@@ -613,63 +705,62 @@ int scoutfs_lock_grant_response(struct super_block *sb,
 	trace_scoutfs_lock_grant_response(sb, lock);
 	BUG_ON(!lock->request_pending);
 
-	bug_on_inconsistent_grant_cache(sb, lock, nl->old_mode, nl->new_mode);
-
-	if (!lock_mode_can_read(nl->old_mode) && lock_mode_can_read(nl->new_mode))
-		lock->refresh_gen = atomic64_inc_return(&linfo->next_refresh_gen);
-
-	lock->request_pending = 0;
-	lock->mode = nl->new_mode;
-	lock->write_seq = le64_to_cpu(nl->write_seq);
-
-	trace_scoutfs_lock_granted(sb, lock);
-	wake_up(&lock->waitq);
-	put_lock(linfo, lock);
+	lock->grant_resp = *gr;
+	list_add_tail(&lock->grant_head, &linfo->grant_list);
+	queue_grant_work(linfo);
 
 	spin_unlock(&linfo->lock);
 
 	return 0;
 }
 
-struct inv_req {
-	struct list_head head;
-	struct scoutfs_lock *lock;
-	u64 net_id;
-	struct scoutfs_net_lock nl;
-};
-
 /*
  * Each lock has received a lock invalidation request from the server
- * which specifies a new mode for the lock.  Our processing state
- * machine and server failover and lock recovery can both conspire to
- * give us triplicate invalidation requests.  The incoming requests for
- * a given lock need to be processed in order, but we can process locks
- * in any order.
+ * which specifies a new mode for the lock.  The server will only send
+ * one invalidation request at a time for each lock.
  *
  * This is an unsolicited request from the server so it can arrive at
- * any time after we make the server aware of the lock.  We wait for
- * users of the current mode to unlock before invalidating.
+ * any time after we make the server aware of the lock by initially
+ * requesting it.  We wait for users of the current mode to unlock
+ * before invalidating.
  *
  * This can arrive on behalf of our request for a mode that conflicts
  * with our current mode.  We have to proceed while we have a request
  * pending.  We can also be racing with shrink requests being sent while
  * we're invalidating.
  *
+ * This can be processed concurrently and experience reordering with a
+ * grant response sent back-to-back from the server.  We carefully only
+ * invalidate once the lock mode matches what the server told us to
+ * invalidate.
+ *
+ * We delay invalidation processing until a grace period has elapsed
+ * since the last unlock.  The intent is to let users do a reasonable
+ * batch of work before dropping the lock.  Continuous unlocking can
+ * continuously extend the deadline.
+ *
  * Before we start invalidating the lock we set the lock to the new
  * mode, preventing further incompatible users of the old mode from
- * using the lock while we're invalidating.  We record the previously
- * granted mode so that we can send lock recover responses with the old
- * granted mode during invalidation.
+ * using the lock while we're invalidating.
+ *
+ * This does a lot of serialized inode invalidation in one context and
+ * performs a lot of repeated calls to sync.  It would be nice to get
+ * some concurrent inode invalidation and to more carefully only call
+ * sync when needed.
  */
 static void lock_invalidate_worker(struct work_struct *work)
 {
-	struct lock_info *linfo = container_of(work, struct lock_info, inv_work);
+	struct lock_info *linfo = container_of(work, struct lock_info,
+					       inv_dwork.work);
 	struct super_block *sb = linfo->sb;
 	struct scoutfs_net_lock *nl;
 	struct scoutfs_lock *lock;
 	struct scoutfs_lock *tmp;
-	struct inv_req *ireq;
+	unsigned long delay = MAX_JIFFY_OFFSET;
+	ktime_t now = ktime_get();
+	ktime_t deadline;
 	LIST_HEAD(ready);
+	u64 net_id;
 	int ret;
 
 	scoutfs_inc_counter(sb, lock_invalidate_work);
@@ -677,15 +768,26 @@ static void lock_invalidate_worker(struct work_struct *work)
 	spin_lock(&linfo->lock);
 
 	list_for_each_entry_safe(lock, tmp, &linfo->inv_list, inv_head) {
-		ireq = list_first_entry(&lock->inv_list, struct inv_req, head);
-		nl = &ireq->nl;
+		nl = &lock->inv_nl;
+
+		/* wait for reordered grant to finish */
+		if (lock->mode != nl->old_mode)
+			continue;
 
 		/* wait until incompatible holders unlock */
 		if (!lock_counts_match(nl->new_mode, lock->users))
 			continue;
 
-		/* set the new mode, no incompatible users during inval, recov needs old */
-		lock->invalidating_mode = lock->mode;
+		/* skip if grace hasn't elapsed, record earliest */
+		deadline = lock->grace_deadline;
+		if (!linfo->shutdown && ktime_before(now, deadline)) {
+			delay = min(delay,
+				    nsecs_to_jiffies(ktime_to_ns(
+						ktime_sub(deadline, now))));
+			scoutfs_inc_counter(linfo->sb, lock_grace_wait);
+			continue;
+		}
+		/* set the new mode, no incompatible users during inval */
 		lock->mode = nl->new_mode;
 
 		/* move everyone that's ready to our private list */
@@ -695,23 +797,18 @@ static void lock_invalidate_worker(struct work_struct *work)
 	spin_unlock(&linfo->lock);
 
 	if (list_empty(&ready))
-		return;
+		goto out;
 
 	/* invalidate once the lock is read */
 	list_for_each_entry(lock, &ready, inv_head) {
-		ireq = list_first_entry(&lock->inv_list, struct inv_req, head);
-		nl = &ireq->nl;
+		nl = &lock->inv_nl;
+		net_id = lock->inv_net_id;
 
-		/* only lock protocol, inv can't call subsystems after shutdown */
-		if (!linfo->shutdown) {
-			ret = lock_invalidate(sb, lock, nl->old_mode, nl->new_mode);
-			BUG_ON(ret);
-		}
+		ret = lock_invalidate(sb, lock, nl->old_mode, nl->new_mode);
+		BUG_ON(ret);
 
-		/* respond with the key and modes from the request, server might have died */
-		ret = scoutfs_client_lock_response(sb, ireq->net_id, nl);
-		if (ret == -ENOTCONN)
-			ret = 0;
+		/* respond with the key and modes from the request */
+		ret = scoutfs_client_lock_response(sb, net_id, nl);
 		BUG_ON(ret);
 
 		scoutfs_inc_counter(sb, lock_invalidate_response);
@@ -721,91 +818,53 @@ static void lock_invalidate_worker(struct work_struct *work)
 	spin_lock(&linfo->lock);
 
 	list_for_each_entry_safe(lock, tmp, &ready, inv_head) {
-		ireq = list_first_entry(&lock->inv_list, struct inv_req, head);
+		list_del_init(&lock->inv_head);
 
+		lock->invalidate_pending = 0;
 		trace_scoutfs_lock_invalidated(sb, lock);
-
-		list_del(&ireq->head);
-		kfree(ireq);
-
-		lock->invalidating_mode = SCOUTFS_LOCK_NULL;
-
-		if (list_empty(&lock->inv_list)) {
-			/* finish if another request didn't arrive */
-			list_del_init(&lock->inv_head);
-			lock->invalidate_pending = 0;
-			wake_up(&lock->waitq);
-		} else {
-			/* another request arrived, back on the list and requeue */
-			list_move_tail(&lock->inv_head, &linfo->inv_list);
-			queue_inv_work(linfo);
-		}
-
+		wake_up(&lock->waitq);
 		put_lock(linfo, lock);
 	}
 
+	/* grant might have been waiting for invalidate request */
+	queue_grant_work(linfo);
 	spin_unlock(&linfo->lock);
+
+out:
+	/* queue delayed work if invalidations waiting on grace deadline */
+	if (delay != MAX_JIFFY_OFFSET)
+		queue_delayed_work(linfo->workq, &linfo->inv_dwork, delay);
 }
 
 /*
- * Add an incoming invalidation request to the end of the list on the
- * lock and queue it for blocking invalidation work.   This is being
- * called synchronously in the net recv path to avoid reordering with
- * grants that were sent immediately before the server sent this
- * invalidation.
+ * Record an incoming invalidate request from the server and add its lock
+ * to the list for processing.
  *
- * Incoming invalidation requests are a function of the remote lock
- * server's state machine and are slightly decoupled from our lock
- * state.  We can receive duplicate requests if the server is quick
- * enough to send the next request after we send a previous reply, or if
- * pending invalidation spans server failover and lock recovery.
- *
- * Similarly, we can get a request to invalidate a lock we don't have if
- * invalidation finished just after lock recovery to a new server.
- * Happily we can just reply because we satisfy the invalidation
- * response promise to not be using the old lock's mode if the lock
- * doesn't exist.
+ * This is trusting the server and will crash if it's sent bad requests :/
  */
 int scoutfs_lock_invalidate_request(struct super_block *sb, u64 net_id,
 				    struct scoutfs_net_lock *nl)
 {
 	DECLARE_LOCK_INFO(sb, linfo);
-	struct scoutfs_lock *lock = NULL;
-	struct inv_req *ireq;
-	int ret = 0;
+	struct scoutfs_lock *lock;
 
 	scoutfs_inc_counter(sb, lock_invalidate_request);
 
-	ireq = kmalloc(sizeof(struct inv_req), GFP_NOFS);
-	BUG_ON(!ireq); /* lock server doesn't handle response errors */
-	if (ireq == NULL) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
 	spin_lock(&linfo->lock);
 	lock = get_lock(sb, &nl->key);
+	BUG_ON(!lock);
 	if (lock) {
+		BUG_ON(lock->invalidate_pending);
+		lock->invalidate_pending = 1;
+		lock->inv_nl = *nl;
+		lock->inv_net_id = net_id;
+		list_add_tail(&lock->inv_head, &linfo->inv_list);
 		trace_scoutfs_lock_invalidate_request(sb, lock);
-		ireq->lock = lock;
-		ireq->net_id = net_id;
-		ireq->nl = *nl;
-		if (list_empty(&lock->inv_list)) {
-			list_add_tail(&lock->inv_head, &linfo->inv_list);
-			lock->invalidate_pending = 1;
-			queue_inv_work(linfo);
-		}
-		list_add_tail(&ireq->head, &lock->inv_list);
+		queue_inv_work(linfo);
 	}
 	spin_unlock(&linfo->lock);
 
-out:
-	if (!lock) {
-		ret = scoutfs_client_lock_response(sb, net_id, nl);
-		BUG_ON(ret); /* lock server doesn't fence timed out client requests */
-	}
-
-	return ret;
+	return 0;
 }
 
 /*
@@ -820,7 +879,6 @@ int scoutfs_lock_recover_request(struct super_block *sb, u64 net_id,
 {
 	DECLARE_LOCK_INFO(sb, linfo);
 	struct scoutfs_net_lock_recover *nlr;
-	enum scoutfs_lock_mode mode;
 	struct scoutfs_lock *lock;
 	struct scoutfs_lock *next;
 	struct rb_node *node;
@@ -841,15 +899,10 @@ int scoutfs_lock_recover_request(struct super_block *sb, u64 net_id,
 
 	for (i = 0; lock && i < SCOUTFS_NET_LOCK_MAX_RECOVER_NR; i++) {
 
-		if (lock->invalidating_mode != SCOUTFS_LOCK_NULL)
-			mode = lock->invalidating_mode;
-		else
-			mode = lock->mode;
-
 		nlr->locks[i].key = lock->start;
-		nlr->locks[i].write_seq = cpu_to_le64(lock->write_seq);
-		nlr->locks[i].old_mode = mode;
-		nlr->locks[i].new_mode = mode;
+		nlr->locks[i].write_version = cpu_to_le64(lock->write_version);
+		nlr->locks[i].old_mode = lock->mode;
+		nlr->locks[i].new_mode = lock->mode;
 
 		node = rb_next(&lock->node);
 		if (node)
@@ -942,7 +995,7 @@ static int lock_key_range(struct super_block *sb, enum scoutfs_lock_mode mode, i
 	lock_inc_count(lock->waiters, mode);
 
 	for (;;) {
-		if (WARN_ON_ONCE(linfo->shutdown)) {
+		if (linfo->shutdown) {
 			ret = -ESHUTDOWN;
 			break;
 		}
@@ -987,14 +1040,8 @@ static int lock_key_range(struct super_block *sb, enum scoutfs_lock_mode mode, i
 
 		trace_scoutfs_lock_wait(sb, lock);
 
-		if (flags & SCOUTFS_LKF_INTERRUPTIBLE) {
-			ret = wait_event_interruptible(lock->waitq,
-						       lock_wait_cond(sb, lock, mode));
-		} else {
-			wait_event(lock->waitq, lock_wait_cond(sb, lock, mode));
-			ret = 0;
-		}
-
+		ret = wait_event_interruptible(lock->waitq,
+					       lock_wait_cond(sb, lock, mode));
 		spin_lock(&linfo->lock);
 		if (ret)
 			break;
@@ -1051,7 +1098,7 @@ int scoutfs_lock_inode(struct super_block *sb, enum scoutfs_lock_mode mode, int
 		goto out;
 
 	if (flags & SCOUTFS_LKF_REFRESH_INODE) {
-		ret = scoutfs_inode_refresh(inode, *lock);
+		ret = scoutfs_inode_refresh(inode, *lock, flags);
 		if (ret < 0) {
 			scoutfs_unlock(sb, *lock, mode);
 			*lock = NULL;
@@ -1212,46 +1259,37 @@ int scoutfs_lock_inode_index(struct super_block *sb, enum scoutfs_lock_mode mode
 }
 
 /*
- * Orphan items are stored in their own zone which are modified with
- * shared write_only locks and are read inconsistently without locks by
- * background scanning work.
+ * The rid lock protects a mount's private persistent items in the rid
+ * zone.  It's held for the duration of the mount.  It lets the mount
+ * modify the rid items at will and signals to other mounts that we're
+ * still alive and our rid items shouldn't be reclaimed.
  *
- * Since we only use write_only locks we just lock the entire zone, but
- * the api provides the inode in case we ever change the locking scheme.
+ * Being held for the entire mount prevents other nodes from reclaiming
+ * our items, like free blocks, when it would make sense for them to be
+ * able to.  Maybe we have a bunch free and they're trying to allocate
+ * and are getting ENOSPC.
  */
-int scoutfs_lock_orphan(struct super_block *sb, enum scoutfs_lock_mode mode, int flags, u64 ino,
-			struct scoutfs_lock **lock)
+int scoutfs_lock_rid(struct super_block *sb, enum scoutfs_lock_mode mode, int flags,
+		     u64 rid, struct scoutfs_lock **lock)
 {
 	struct scoutfs_key start;
 	struct scoutfs_key end;
 
 	scoutfs_key_set_zeros(&start);
-	start.sk_zone = SCOUTFS_ORPHAN_ZONE;
-	start.sko_ino = 0;
-	start.sk_type = SCOUTFS_ORPHAN_TYPE;
+	start.sk_zone = SCOUTFS_RID_ZONE;
+	start.sko_rid = cpu_to_le64(rid);
 
-	scoutfs_key_set_zeros(&end);
-	end.sk_zone = SCOUTFS_ORPHAN_ZONE;
-	end.sko_ino = cpu_to_le64(U64_MAX);
-	end.sk_type = SCOUTFS_ORPHAN_TYPE;
-
-	return lock_key_range(sb, mode, flags, &start, &end, lock);
-}
-
-int scoutfs_lock_xattr_totl(struct super_block *sb, enum scoutfs_lock_mode mode, int flags,
-			    struct scoutfs_lock **lock)
-{
-	struct scoutfs_key start;
-	struct scoutfs_key end;
-
-	scoutfs_key_set_zeros(&start);
-	start.sk_zone = SCOUTFS_XATTR_TOTL_ZONE;
 	scoutfs_key_set_ones(&end);
-	end.sk_zone = SCOUTFS_XATTR_TOTL_ZONE;
+	end.sk_zone = SCOUTFS_RID_ZONE;
+	end.sko_rid = cpu_to_le64(rid);
 
 	return lock_key_range(sb, mode, flags, &start, &end, lock);
 }
 
+/*
+ * As we unlock we always extend the grace period to give the caller
+ * another pass at the lock before its invalidated.
+ */
 void scoutfs_unlock(struct super_block *sb, struct scoutfs_lock *lock, enum scoutfs_lock_mode mode)
 {
 	DECLARE_LOCK_INFO(sb, linfo);
@@ -1264,6 +1302,7 @@ void scoutfs_unlock(struct super_block *sb, struct scoutfs_lock *lock, enum scou
 	spin_lock(&linfo->lock);
 
 	lock_dec_count(lock->users, mode);
+	extend_grace(sb, lock);
 	if (lock_mode_can_write(mode))
 		lock->dirty_trans_seq = scoutfs_trans_sample_seq(sb);
 
@@ -1346,7 +1385,7 @@ void scoutfs_lock_del_coverage(struct super_block *sb,
 bool scoutfs_lock_protected(struct scoutfs_lock *lock, struct scoutfs_key *key,
 			    enum scoutfs_lock_mode mode)
 {
-	signed char lock_mode = READ_ONCE(lock->mode);
+	signed char lock_mode = ACCESS_ONCE(lock->mode);
 
 	return lock_modes_match(lock_mode, mode) &&
 	       scoutfs_key_compare_ranges(key, key,
@@ -1401,17 +1440,6 @@ static void lock_shrink_worker(struct work_struct *work)
 	}
 }
 
-static unsigned long lock_count_objects(struct shrinker *shrink,
-					struct shrink_control *sc)
-{
-	struct lock_info *linfo = KC_SHRINKER_CONTAINER_OF(shrink, struct lock_info);
-	struct super_block *sb = linfo->sb;
-
-	scoutfs_inc_counter(sb, lock_count_objects);
-
-	return shrinker_min_long(linfo->lru_nr);
-}
-
 /*
  * Start the shrinking process for locks on the lru.  If a lock is on
  * the lru then it can't have any active users.  We don't want to block
@@ -1424,18 +1452,21 @@ static unsigned long lock_count_objects(struct shrinker *shrink,
  * mode which will prevent the lock from being freed when the null
  * response arrives.
  */
-static unsigned long lock_scan_objects(struct shrinker *shrink,
-				       struct shrink_control *sc)
+static int scoutfs_lock_shrink(struct shrinker *shrink,
+			       struct shrink_control *sc)
 {
-	struct lock_info *linfo = KC_SHRINKER_CONTAINER_OF(shrink, struct lock_info);
+	struct lock_info *linfo = container_of(shrink, struct lock_info,
+					       shrinker);
 	struct super_block *sb = linfo->sb;
 	struct scoutfs_lock *lock;
 	struct scoutfs_lock *tmp;
-	unsigned long freed = 0;
-	unsigned long nr = sc->nr_to_scan;
+	unsigned long nr;
 	bool added = false;
+	int ret;
 
-	scoutfs_inc_counter(sb, lock_scan_objects);
+	nr = sc->nr_to_scan;
+	if (nr == 0)
+		goto out;
 
 	spin_lock(&linfo->lock);
 
@@ -1446,14 +1477,13 @@ restart:
 		BUG_ON(lock->mode == SCOUTFS_LOCK_NULL);
 		BUG_ON(!list_empty(&lock->shrink_head));
 
-		if (nr-- == 0)
+		if (linfo->shutdown || nr-- == 0)
 			break;
 
 		__lock_del_lru(linfo, lock);
 		lock->request_pending = 1;
 		list_add_tail(&lock->shrink_head, &linfo->shrink_list);
 		added = true;
-		freed++;
 
 		scoutfs_inc_counter(sb, lock_shrink_attempted);
 		trace_scoutfs_lock_shrink(sb, lock);
@@ -1468,11 +1498,13 @@ restart:
 	if (added)
 		queue_work(linfo->workq, &linfo->shrink_work);
 
-	trace_scoutfs_lock_shrink_exit(sb, sc->nr_to_scan, freed);
-	return freed;
+out:
+	ret = min_t(unsigned long, linfo->lru_nr, INT_MAX);
+	trace_scoutfs_lock_shrink_exit(sb, sc->nr_to_scan, ret);
+	return ret;
 }
 
-void scoutfs_free_unused_locks(struct super_block *sb)
+void scoutfs_free_unused_locks(struct super_block *sb, unsigned long nr)
 {
 	struct lock_info *linfo = SCOUTFS_SB(sb)->lock_info;
 	struct shrink_control sc = {
@@ -1480,7 +1512,7 @@ void scoutfs_free_unused_locks(struct super_block *sb)
 		.nr_to_scan = INT_MAX,
 	};
 
-	lock_scan_objects(KC_SHRINKER_FN(&linfo->shrinker), &sc);
+	linfo->shrinker.shrink(&linfo->shrinker, &sc);
 }
 
 static void lock_tseq_show(struct seq_file *m, struct scoutfs_tseq_entry *ent)
@@ -1500,80 +1532,15 @@ static void lock_tseq_show(struct seq_file *m, struct scoutfs_tseq_entry *ent)
 }
 
 /*
- * shrink_dcache_for_umount() tears down dentries with no locking.  We
- * need to make sure that our invalidation won't touch dentries before
- * we return and the caller calls the generic vfs unmount path.
- */
-void scoutfs_lock_unmount_begin(struct super_block *sb)
-{
-	DECLARE_LOCK_INFO(sb, linfo);
-
-	if (linfo) {
-		linfo->unmounting = true;
-		flush_work(&linfo->inv_work);
-	}
-}
-
-void scoutfs_lock_flush_invalidate(struct super_block *sb)
-{
-	DECLARE_LOCK_INFO(sb, linfo);
-
-	if (linfo)
-		flush_work(&linfo->inv_work);
-}
-
-static u64 get_held_lock_refresh_gen(struct super_block *sb, struct scoutfs_key *start)
-{
-	DECLARE_LOCK_INFO(sb, linfo);
-	struct scoutfs_lock *lock;
-	u64 refresh_gen = 0;
-
-	/* this can be called from all manner of places */
-	if (!linfo)
-		return 0;
-
-	spin_lock(&linfo->lock);
-	lock = lock_lookup(sb, start, NULL);
-	if (lock) {
-		if (lock_mode_can_read(lock->mode))
-			refresh_gen = lock->refresh_gen;
-	}
-	spin_unlock(&linfo->lock);
-
-	return refresh_gen;
-}
-
-u64 scoutfs_lock_ino_refresh_gen(struct super_block *sb, u64 ino)
-{
-	struct scoutfs_key start;
-
-	scoutfs_key_set_zeros(&start);
-	start.sk_zone = SCOUTFS_FS_ZONE;
-	start.ski_ino = cpu_to_le64(ino & ~(u64)SCOUTFS_LOCK_INODE_GROUP_MASK);
-
-	return get_held_lock_refresh_gen(sb, &start);
-}
-
-/*
- * The caller is going to be shutting down transactions and the client.
- * We need to make sure that locking won't call either after we return.
+ * The caller is going to be calling _destroy soon and, critically, is
+ * about to shutdown networking before calling us so that we don't get
+ * any callbacks while we're destroying.  We have to ensure that we
+ * won't call networking after this returns.
  *
- * At this point all fs callers and internal services that use locks
- * should have stopped.  We won't have any callers initiating lock
- * transitions and sending requests.   We set the shutdown flag to catch
- * anyone who breaks this rule.
- *
- * We unregister the shrinker so that we won't try and send null
- * requests in response to memory pressure.  The locks will all be
- * unceremoniously dropped once we get a farewell response from the
- * server which indicates that they destroyed our locking state.
- *
- * We will still respond to invalidation requests that have to be
- * processed to let unmount in other mounts acquire locks and make
- * progress.  However, we don't fully process the invalidation because
- * we're shutting down.  We only update the lock state and send the
- * response.  We shouldn't have any users of locking that require
- * invalidation correctness at this point.
+ * Internal fs threads can be using locking, and locking can have async
+ * work pending.  We use ->shutdown to force callers to return
+ * -ESHUTDOWN and to prevent the future queueing of work that could call
+ * networking.  Locks whose work is stopped will be torn down by _destroy.
  */
 void scoutfs_lock_shutdown(struct super_block *sb)
 {
@@ -1586,18 +1553,19 @@ void scoutfs_lock_shutdown(struct super_block *sb)
 
 	trace_scoutfs_lock_shutdown(sb, linfo);
 
-	/* stop the shrinker from queueing work */
-	KC_UNREGISTER_SHRINKER(&linfo->shrinker);
-	flush_work(&linfo->shrink_work);
-
-	/* cause current and future lock calls to return errors */
 	spin_lock(&linfo->lock);
+
 	linfo->shutdown = true;
 	for (node = rb_first(&linfo->lock_tree); node; node = rb_next(node)) {
 		lock = rb_entry(node, struct scoutfs_lock, node);
 		wake_up(&lock->waitq);
 	}
+
 	spin_unlock(&linfo->lock);
+
+	flush_work(&linfo->grant_work);
+	flush_delayed_work(&linfo->inv_dwork);
+	flush_work(&linfo->shrink_work);
 }
 
 /*
@@ -1617,8 +1585,6 @@ void scoutfs_lock_destroy(struct super_block *sb)
 	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
 	DECLARE_LOCK_INFO(sb, linfo);
 	struct scoutfs_lock *lock;
-	struct inv_req *ireq_tmp;
-	struct inv_req *ireq;
 	struct rb_node *node;
 	enum scoutfs_lock_mode mode;
 
@@ -1627,6 +1593,8 @@ void scoutfs_lock_destroy(struct super_block *sb)
 
 	trace_scoutfs_lock_destroy(sb, linfo);
 
+	/* stop the shrinker from queueing work */
+	unregister_shrinker(&linfo->shrinker);
 
 	/* make sure that no one's actively using locks */
 	spin_lock(&linfo->lock);
@@ -1645,6 +1613,8 @@ void scoutfs_lock_destroy(struct super_block *sb)
 	spin_unlock(&linfo->lock);
 
 	if (linfo->workq) {
+		/* pending grace work queues normal work */
+		flush_workqueue(linfo->workq);
 		/* now all work won't queue itself */
 		destroy_workqueue(linfo->workq);
 	}
@@ -1661,31 +1631,22 @@ void scoutfs_lock_destroy(struct super_block *sb)
 	 * of free).
 	 */
 	spin_lock(&linfo->lock);
-
 	node = rb_first(&linfo->lock_tree);
 	while (node) {
 		lock = rb_entry(node, struct scoutfs_lock, node);
 		node = rb_next(node);
-
-		list_for_each_entry_safe(ireq, ireq_tmp, &lock->inv_list, head) {
-			list_del_init(&ireq->head);
-			put_lock(linfo, ireq->lock);
-			kfree(ireq);
-		}
-
 		lock->request_pending = 0;
 		if (!list_empty(&lock->lru_head))
 			__lock_del_lru(linfo, lock);
-		if (!list_empty(&lock->inv_head)) {
+		if (!list_empty(&lock->grant_head))
+			list_del_init(&lock->grant_head);
+		if (!list_empty(&lock->inv_head))
 			list_del_init(&lock->inv_head);
-			lock->invalidate_pending = 0;
-		}
 		if (!list_empty(&lock->shrink_head))
 			list_del_init(&lock->shrink_head);
 		lock_remove(linfo, lock);
 		lock_free(linfo, lock);
 	}
-
 	spin_unlock(&linfo->lock);
 
 	kfree(linfo);
@@ -1706,11 +1667,13 @@ int scoutfs_lock_setup(struct super_block *sb)
 	spin_lock_init(&linfo->lock);
 	linfo->lock_tree = RB_ROOT;
 	linfo->lock_range_tree = RB_ROOT;
-	KC_INIT_SHRINKER_FUNCS(&linfo->shrinker, lock_count_objects,
-			       lock_scan_objects);
-	KC_REGISTER_SHRINKER(&linfo->shrinker);
+	linfo->shrinker.shrink = scoutfs_lock_shrink;
+	linfo->shrinker.seeks = DEFAULT_SEEKS;
+	register_shrinker(&linfo->shrinker);
 	INIT_LIST_HEAD(&linfo->lru_list);
-	INIT_WORK(&linfo->inv_work, lock_invalidate_worker);
+	INIT_WORK(&linfo->grant_work, lock_grant_worker);
+	INIT_LIST_HEAD(&linfo->grant_list);
+	INIT_DELAYED_WORK(&linfo->inv_dwork, lock_invalidate_worker);
 	INIT_LIST_HEAD(&linfo->inv_list);
 	INIT_WORK(&linfo->shrink_work, lock_shrink_worker);
 	INIT_LIST_HEAD(&linfo->shrink_list);

kmod/src/lock.h

@@ -6,15 +6,12 @@
 
 #define SCOUTFS_LKF_REFRESH_INODE	0x01 /* update stale inode from item */
 #define SCOUTFS_LKF_NONBLOCK		0x02 /* only use already held locks */
-#define SCOUTFS_LKF_INTERRUPTIBLE	0x04 /* pending signals return -ERESTARTSYS */
-#define SCOUTFS_LKF_INVALID		(~((SCOUTFS_LKF_INTERRUPTIBLE << 1) - 1))
+#define SCOUTFS_LKF_INVALID		(~((SCOUTFS_LKF_NONBLOCK << 1) - 1))
 
 #define SCOUTFS_LOCK_NR_MODES		SCOUTFS_LOCK_INVALID
 
-struct inode_deletion_lock_data;
-
 /*
- * A few fields (start, end, refresh_gen, write_seq, granted_mode)
+ * A few fields (start, end, refresh_gen, write_version, granted_mode)
  * are referenced by code outside lock.c.
  */
 struct scoutfs_lock {
@@ -24,22 +21,26 @@ struct scoutfs_lock {
 	struct rb_node node;
 	struct rb_node range_node;
 	u64 refresh_gen;
-	u64 write_seq;
+	u64 write_version;
 	u64 dirty_trans_seq;
+	struct scoutfs_net_roots roots;
 	struct list_head lru_head;
 	wait_queue_head_t waitq;
+	ktime_t grace_deadline;
 	unsigned long request_pending:1,
 		      invalidate_pending:1;
 
-	struct list_head inv_head;  /* entry in linfo's list of locks with invalidations */
-	struct list_head inv_list;  /* list of lock's invalidation requests */
+	struct list_head grant_head;
+	struct scoutfs_net_lock_grant_response grant_resp;
+	struct list_head inv_head;
+	struct scoutfs_net_lock inv_nl;
+	u64 inv_net_id;
 	struct list_head shrink_head;
 
 	spinlock_t cov_list_lock;
 	struct list_head cov_list;
 
 	enum scoutfs_lock_mode mode;
-	enum scoutfs_lock_mode invalidating_mode;
 	unsigned int waiters[SCOUTFS_LOCK_NR_MODES];
 	unsigned int users[SCOUTFS_LOCK_NR_MODES];
 
@@ -47,9 +48,6 @@ struct scoutfs_lock {
 
 	/* the forest tracks which log tree last saw bloom bit updates */
 	atomic64_t forest_bloom_nr;
-
-	/* inode deletion tracks some state per lock */
-	struct inode_deletion_lock_data *inode_deletion_data;
 };
 
 struct scoutfs_lock_coverage {
@@ -59,7 +57,7 @@ struct scoutfs_lock_coverage {
 };
 
 int scoutfs_lock_grant_response(struct super_block *sb,
-				struct scoutfs_net_lock *nl);
+				struct scoutfs_net_lock_grant_response *gr);
 int scoutfs_lock_invalidate_request(struct super_block *sb, u64 net_id,
 				    struct scoutfs_net_lock *nl);
 int scoutfs_lock_recover_request(struct super_block *sb, u64 net_id,
@@ -82,10 +80,8 @@ int scoutfs_lock_inodes(struct super_block *sb, enum scoutfs_lock_mode mode, int
 			struct inode *d, struct scoutfs_lock **D_lock);
 int scoutfs_lock_rename(struct super_block *sb, enum scoutfs_lock_mode mode, int flags,
 			struct scoutfs_lock **lock);
-int scoutfs_lock_orphan(struct super_block *sb, enum scoutfs_lock_mode mode, int flags,
-		        u64 ino, struct scoutfs_lock **lock);
-int scoutfs_lock_xattr_totl(struct super_block *sb, enum scoutfs_lock_mode mode, int flags,
-			    struct scoutfs_lock **lock);
+int scoutfs_lock_rid(struct super_block *sb, enum scoutfs_lock_mode mode, int flags,
+		     u64 rid, struct scoutfs_lock **lock);
 void scoutfs_unlock(struct super_block *sb, struct scoutfs_lock *lock,
 		    enum scoutfs_lock_mode mode);
 
@@ -100,13 +96,9 @@ void scoutfs_lock_del_coverage(struct super_block *sb,
 bool scoutfs_lock_protected(struct scoutfs_lock *lock, struct scoutfs_key *key,
 			    enum scoutfs_lock_mode mode);
 
-u64 scoutfs_lock_ino_refresh_gen(struct super_block *sb, u64 ino);
-
-void scoutfs_free_unused_locks(struct super_block *sb);
+void scoutfs_free_unused_locks(struct super_block *sb, unsigned long nr);
 
 int scoutfs_lock_setup(struct super_block *sb);
-void scoutfs_lock_unmount_begin(struct super_block *sb);
-void scoutfs_lock_flush_invalidate(struct super_block *sb);
 void scoutfs_lock_shutdown(struct super_block *sb);
 void scoutfs_lock_destroy(struct super_block *sb);
 

kmod/src/lock_server.c

@@ -20,10 +20,10 @@
 #include "tseq.h"
 #include "spbm.h"
 #include "block.h"
+#include "btree.h"
 #include "msg.h"
 #include "scoutfs_trace.h"
 #include "lock_server.h"
-#include "recov.h"
 
 /*
  * The scoutfs server implements a simple lock service.  Client mounts
@@ -56,11 +56,14 @@
  * Message requests and responses are reliably delivered in order across
  * reconnection.
  *
- * As a new server comes up it recovers lock state from existing clients
- * which were connected to a previous lock server.  Recover requests are
- * sent to clients as they connect and they respond with all there
- * locks.  Once all clients and locks are accounted for normal
- * processing can resume.
+ * The server maintains a persistent record of connected clients.  A new
+ * server instance discovers these and waits for previously connected
+ * clients to reconnect and recover their state before proceeding.  If
+ * clients don't reconnect they are forcefully prevented from unsafely
+ * accessing the shared persistent storage.  (fenced, according to the
+ * rules of the platform.. could range from being powered off to having
+ * their switch port disabled to having their local block device set
+ * read-only.)
  *
  * The lock server doesn't respond to memory pressure.  The only way
  * locks are freed is if they are invalidated to null on behalf of a
@@ -74,12 +77,19 @@ struct lock_server_info {
 	struct super_block *sb;
 
 	spinlock_t lock;
+	struct mutex mutex;
 	struct rb_root locks_root;
 
+	struct scoutfs_spbm recovery_pending;
+	struct delayed_work recovery_dwork;
+
 	struct scoutfs_tseq_tree tseq_tree;
 	struct dentry *tseq_dentry;
-	struct scoutfs_tseq_tree stats_tseq_tree;
-	struct dentry *stats_tseq_dentry;
+
+	struct scoutfs_alloc *alloc;
+	struct scoutfs_block_writer *wri;
+
+	atomic64_t write_version;
 };
 
 #define DECLARE_LOCK_SERVER_INFO(sb, name) \
@@ -106,9 +116,6 @@ struct server_lock_node {
 	struct list_head granted;
 	struct list_head requested;
 	struct list_head invalidated;
-
-	struct scoutfs_tseq_entry stats_tseq_entry;
-	u64 stats[SLT_NR];
 };
 
 /*
@@ -153,30 +160,30 @@ enum {
  */
 static void add_client_entry(struct server_lock_node *snode,
 			     struct list_head *list,
-			     struct client_lock_entry *c_ent)
+			     struct client_lock_entry *clent)
 {
 	WARN_ON_ONCE(!mutex_is_locked(&snode->mutex));
 
-	if (list_empty(&c_ent->head))
-		list_add_tail(&c_ent->head, list);
+	if (list_empty(&clent->head))
+		list_add_tail(&clent->head, list);
 	else
-		list_move_tail(&c_ent->head, list);
+		list_move_tail(&clent->head, list);
 
-	c_ent->on_list = list == &snode->granted ? OL_GRANTED :
+	clent->on_list = list == &snode->granted ? OL_GRANTED :
 			 list == &snode->requested ? OL_REQUESTED :
 			 OL_INVALIDATED;
 }
 
 static void free_client_entry(struct lock_server_info *inf,
 			      struct server_lock_node *snode,
-			      struct client_lock_entry *c_ent)
+			      struct client_lock_entry *clent)
 {
 	WARN_ON_ONCE(!mutex_is_locked(&snode->mutex));
 
-	if (!list_empty(&c_ent->head))
-		list_del_init(&c_ent->head);
-	scoutfs_tseq_del(&inf->tseq_tree, &c_ent->tseq_entry);
-	kfree(c_ent);
+	if (!list_empty(&clent->head))
+		list_del_init(&clent->head);
+	scoutfs_tseq_del(&inf->tseq_tree, &clent->tseq_entry);
+	kfree(clent);
 }
 
 static bool invalid_mode(u8 mode)
@@ -298,8 +305,6 @@ static struct server_lock_node *alloc_server_lock(struct lock_server_info *inf,
 			snode = get_server_lock(inf, key, ins, false);
 			if (snode != ins)
 				kfree(ins);
-			else
-				scoutfs_tseq_add(&inf->stats_tseq_tree, &snode->stats_tseq_entry);
 		}
 	}
 
@@ -329,23 +334,21 @@ static void put_server_lock(struct lock_server_info *inf,
 
 	mutex_unlock(&snode->mutex);
 
-	if (should_free) {
-		scoutfs_tseq_del(&inf->stats_tseq_tree, &snode->stats_tseq_entry);
+	if (should_free)
 		kfree(snode);
-	}
 }
 
 static struct client_lock_entry *find_entry(struct server_lock_node *snode,
 					    struct list_head *list,
 					    u64 rid)
 {
-	struct client_lock_entry *c_ent;
+	struct client_lock_entry *clent;
 
 	WARN_ON_ONCE(!mutex_is_locked(&snode->mutex));
 
-	list_for_each_entry(c_ent, list, head) {
-		if (c_ent->rid == rid)
-			return c_ent;
+	list_for_each_entry(clent, list, head) {
+		if (clent->rid == rid)
+			return clent;
 	}
 
 	return NULL;
@@ -364,7 +367,7 @@ int scoutfs_lock_server_request(struct super_block *sb, u64 rid,
 				u64 net_id, struct scoutfs_net_lock *nl)
 {
 	DECLARE_LOCK_SERVER_INFO(sb, inf);
-	struct client_lock_entry *c_ent;
+	struct client_lock_entry *clent;
 	struct server_lock_node *snode;
 	int ret;
 
@@ -376,29 +379,27 @@ int scoutfs_lock_server_request(struct super_block *sb, u64 rid,
 		goto out;
 	}
 
-	c_ent = kzalloc(sizeof(struct client_lock_entry), GFP_NOFS);
-	if (!c_ent) {
+	clent = kzalloc(sizeof(struct client_lock_entry), GFP_NOFS);
+	if (!clent) {
 		ret = -ENOMEM;
 		goto out;
 	}
 
-	INIT_LIST_HEAD(&c_ent->head);
-	c_ent->rid = rid;
-	c_ent->net_id = net_id;
-	c_ent->mode = nl->new_mode;
+	INIT_LIST_HEAD(&clent->head);
+	clent->rid = rid;
+	clent->net_id = net_id;
+	clent->mode = nl->new_mode;
 
 	snode = alloc_server_lock(inf, &nl->key);
 	if (snode == NULL) {
-		kfree(c_ent);
+		kfree(clent);
 		ret = -ENOMEM;
 		goto out;
 	}
 
-	snode->stats[SLT_REQUEST]++;
-
-	c_ent->snode = snode;
-	add_client_entry(snode, &snode->requested, c_ent);
-	scoutfs_tseq_add(&inf->tseq_tree, &c_ent->tseq_entry);
+	clent->snode = snode;
+	add_client_entry(snode, &snode->requested, clent);
+	scoutfs_tseq_add(&inf->tseq_tree, &clent->tseq_entry);
 
 	ret = process_waiting_requests(sb, snode);
 out:
@@ -417,7 +418,7 @@ int scoutfs_lock_server_response(struct super_block *sb, u64 rid,
 				 struct scoutfs_net_lock *nl)
 {
 	DECLARE_LOCK_SERVER_INFO(sb, inf);
-	struct client_lock_entry *c_ent;
+	struct client_lock_entry *clent;
 	struct server_lock_node *snode;
 	int ret;
 
@@ -429,27 +430,25 @@ int scoutfs_lock_server_response(struct super_block *sb, u64 rid,
 		goto out;
 	}
 
-	/* XXX should always have a server lock here? */
+	/* XXX should always have a server lock here?  recovery? */
 	snode = get_server_lock(inf, &nl->key, NULL, false);
 	if (!snode) {
 		ret = -EINVAL;
 		goto out;
 	}
 
-	snode->stats[SLT_RESPONSE]++;
-
-	c_ent = find_entry(snode, &snode->invalidated, rid);
-	if (!c_ent) {
+	clent = find_entry(snode, &snode->invalidated, rid);
+	if (!clent) {
 		put_server_lock(inf, snode);
 		ret = -EINVAL;
 		goto out;
 	}
 
 	if (nl->new_mode == SCOUTFS_LOCK_NULL) {
-		free_client_entry(inf, snode, c_ent);
+		free_client_entry(inf, snode, clent);
 	} else {
-		c_ent->mode = nl->new_mode;
-		add_client_entry(snode, &snode->granted, c_ent);
+		clent->mode = nl->new_mode;
+		add_client_entry(snode, &snode->granted, clent);
 	}
 
 	ret = process_waiting_requests(sb, snode);
@@ -474,27 +473,31 @@ out:
  * so we unlock the snode mutex.
  *
  * All progress must wait for all clients to finish with recovery
- * because we don't know which locks they'll hold.  Once recover
- * finishes the server calls us to kick all the locks that were waiting
- * during recovery.
+ * because we don't know which locks they'll hold.  The unlocked
+ * recovery_pending test here is OK.  It's filled by setup before
+ * anything runs.  It's emptied by recovery completion.  We can get a
+ * false nonempty result if we race with recovery completion, but that's
+ * OK because recovery completion processes all the locks that have
+ * requests after emptying, including the unlikely loser of that race.
  */
 static int process_waiting_requests(struct super_block *sb,
 				    struct server_lock_node *snode)
 {
 	DECLARE_LOCK_SERVER_INFO(sb, inf);
+	struct scoutfs_net_lock_grant_response gres;
 	struct scoutfs_net_lock nl;
 	struct client_lock_entry *req;
 	struct client_lock_entry *req_tmp;
 	struct client_lock_entry *gr;
 	struct client_lock_entry *gr_tmp;
-	u64 seq;
+	u64 wv;
 	int ret;
 
 	BUG_ON(!mutex_is_locked(&snode->mutex));
 
 	/* processing waits for all invalidation responses or recovery */
 	if (!list_empty(&snode->invalidated) ||
-	    scoutfs_recov_next_pending(sb, 0, SCOUTFS_RECOV_LOCKS) != 0) {
+	    !scoutfs_spbm_empty(&inf->recovery_pending)) {
 		ret = 0;
 		goto out;
 	}
@@ -518,7 +521,6 @@ static int process_waiting_requests(struct super_block *sb,
 			trace_scoutfs_lock_message(sb, SLT_SERVER,
 						   SLT_INVALIDATE, SLT_REQUEST,
 						   gr->rid, 0, &nl);
-			snode->stats[SLT_INVALIDATE]++;
 
 			add_client_entry(snode, &snode->invalidated, gr);
 		}
@@ -529,7 +531,6 @@ static int process_waiting_requests(struct super_block *sb,
 
 		nl.key = snode->key;
 		nl.new_mode = req->mode;
-		nl.write_seq = 0;
 
 		/* see if there's an existing compatible grant to replace */
 		gr = find_entry(snode, &snode->granted, req->rid);
@@ -542,20 +543,21 @@ static int process_waiting_requests(struct super_block *sb,
 
 		if (nl.new_mode == SCOUTFS_LOCK_WRITE ||
 		    nl.new_mode == SCOUTFS_LOCK_WRITE_ONLY) {
-			/* doesn't commit seq update, recovered with locks */
-			seq = scoutfs_server_next_seq(sb);
-			nl.write_seq = cpu_to_le64(seq);
+			wv = atomic64_inc_return(&inf->write_version);
+			nl.write_version = cpu_to_le64(wv);
 		}
 
+		gres.nl = nl;
+		scoutfs_server_get_roots(sb, &gres.roots);
+
 		ret = scoutfs_server_lock_response(sb, req->rid,
-						   req->net_id, &nl);
+						   req->net_id, &gres);
 		if (ret)
 			goto out;
 
 		trace_scoutfs_lock_message(sb, SLT_SERVER, SLT_GRANT,
 					   SLT_RESPONSE, req->rid,
 					   req->net_id, &nl);
-		snode->stats[SLT_GRANT]++;
 
 		/* don't track null client locks, track all else */ 
 		if (req->mode == SCOUTFS_LOCK_NULL)
@@ -571,39 +573,89 @@ out:
 	return ret;
 }
 
+static void init_lock_clients_key(struct scoutfs_key *key, u64 rid)
+{
+	*key = (struct scoutfs_key) {
+		.sk_zone = SCOUTFS_LOCK_CLIENTS_ZONE,
+		.sklc_rid = cpu_to_le64(rid),
+	};
+}
+
 /*
  * The server received a greeting from a client for the first time.  If
- * the client is in lock recovery then we send the initial lock request.
+ * the client had already talked to the server then we must find an
+ * existing record for it and should begin recovery.  If it doesn't have
+ * a record then its timed out and we can't allow it to reconnect.  If
+ * we're creating a new record for a client we can see EEXIST if the
+ * greeting is resent to a new server after the record was committed but
+ * before the response was received by the client.
  *
  * This is running in concurrent client greeting processing contexts.
  */
-int scoutfs_lock_server_greeting(struct super_block *sb, u64 rid)
+int scoutfs_lock_server_greeting(struct super_block *sb, u64 rid,
+				 bool should_exist)
 {
+	DECLARE_LOCK_SERVER_INFO(sb, inf);
+	struct scoutfs_super_block *super = &SCOUTFS_SB(sb)->super;
+	SCOUTFS_BTREE_ITEM_REF(iref);
 	struct scoutfs_key key;
 	int ret;
 
-	if (scoutfs_recov_is_pending(sb, rid, SCOUTFS_RECOV_LOCKS)) {
+	init_lock_clients_key(&key, rid);
+
+	mutex_lock(&inf->mutex);
+	if (should_exist) {
+		ret = scoutfs_btree_lookup(sb, &super->lock_clients, &key,
+					   &iref);
+		if (ret == 0)
+			scoutfs_btree_put_iref(&iref);
+	} else {
+		ret = scoutfs_btree_insert(sb, inf->alloc, inf->wri,
+					   &super->lock_clients,
+					   &key, NULL, 0);
+		if (ret == -EEXIST)
+			ret = 0;
+	}
+	mutex_unlock(&inf->mutex);
+
+	if (should_exist && ret == 0) {
 		scoutfs_key_set_zeros(&key);
 		ret = scoutfs_server_lock_recover_request(sb, rid, &key);
-	} else {
-		ret = 0;
+		if (ret)
+			goto out;
 	}
 
+out:
 	return ret;
 }
 
 /*
- * All clients have finished lock recovery, we can make forward process
- * on all the queued requests that were waiting on recovery.
+ * A client sent their last recovery response and can exit recovery.  If
+ * they were the last client in recovery then we can process all the
+ * server locks that had requests.
  */
-int scoutfs_lock_server_finished_recovery(struct super_block *sb)
+static int finished_recovery(struct super_block *sb, u64 rid, bool cancel)
 {
 	DECLARE_LOCK_SERVER_INFO(sb, inf);
 	struct server_lock_node *snode;
 	struct scoutfs_key key;
+	bool still_pending;
 	int ret = 0;
 
+	spin_lock(&inf->lock);
+	scoutfs_spbm_clear(&inf->recovery_pending, rid);
+	still_pending = !scoutfs_spbm_empty(&inf->recovery_pending);
+	spin_unlock(&inf->lock);
+	if (still_pending)
+		return 0;
+
+	if (cancel)
+		cancel_delayed_work_sync(&inf->recovery_dwork);
+
 	scoutfs_key_set_zeros(&key);
+
+	scoutfs_info(sb, "all lock clients recovered");
+
 	while ((snode = get_server_lock(inf, &key, NULL, true))) {
 
 		key = snode->key;
@@ -621,6 +673,14 @@ int scoutfs_lock_server_finished_recovery(struct super_block *sb)
 	return ret;
 }
 
+static void set_max_write_version(struct lock_server_info *inf, u64 new)
+{
+	u64 old;
+
+	while (new > (old = atomic64_read(&inf->write_version)) &&
+	       (atomic64_cmpxchg(&inf->write_version, old, new) != old));
+}
+
 /*
  * We sent a lock recover request to the client when we received its
  * greeting while in recovery.  Here we instantiate all the locks it
@@ -632,61 +692,62 @@ int scoutfs_lock_server_recover_response(struct super_block *sb, u64 rid,
 {
 	DECLARE_LOCK_SERVER_INFO(sb, inf);
 	struct client_lock_entry *existing;
-	struct client_lock_entry *c_ent;
+	struct client_lock_entry *clent;
 	struct server_lock_node *snode;
 	struct scoutfs_key key;
 	int ret = 0;
 	int i;
 
 	/* client must be in recovery */
-	if (!scoutfs_recov_is_pending(sb, rid, SCOUTFS_RECOV_LOCKS)) {
+	spin_lock(&inf->lock);
+	if (!scoutfs_spbm_test(&inf->recovery_pending, rid))
 		ret = -EINVAL;
+	spin_unlock(&inf->lock);
+	if (ret)
 		goto out;
-	}
 
 	/* client has sent us all their locks */
 	if (nlr->nr == 0) {
-		scoutfs_server_recov_finish(sb, rid, SCOUTFS_RECOV_LOCKS);
-		ret = 0;
+		ret = finished_recovery(sb, rid, true);
 		goto out;
 	}
 
 	for (i = 0; i < le16_to_cpu(nlr->nr); i++) {
-		c_ent = kzalloc(sizeof(struct client_lock_entry), GFP_NOFS);
-		if (!c_ent) {
+		clent = kzalloc(sizeof(struct client_lock_entry), GFP_NOFS);
+		if (!clent) {
 			ret = -ENOMEM;
 			goto out;
 		}
 
-		INIT_LIST_HEAD(&c_ent->head);
-		c_ent->rid = rid;
-		c_ent->net_id = 0;
-		c_ent->mode = nlr->locks[i].new_mode;
+		INIT_LIST_HEAD(&clent->head);
+		clent->rid = rid;
+		clent->net_id = 0;
+		clent->mode = nlr->locks[i].new_mode;
 
 		snode = alloc_server_lock(inf, &nlr->locks[i].key);
 		if (snode == NULL) {
-			kfree(c_ent);
+			kfree(clent);
 			ret = -ENOMEM;
 			goto out;
 		}
 
 		existing = find_entry(snode, &snode->granted, rid);
 		if (existing) {
-			kfree(c_ent);
+			kfree(clent);
 			put_server_lock(inf, snode);
 			ret = -EEXIST;
 			goto out;
 		}
 
-		c_ent->snode = snode;
-		add_client_entry(snode, &snode->granted, c_ent);
-		scoutfs_tseq_add(&inf->tseq_tree, &c_ent->tseq_entry);
+		clent->snode = snode;
+		add_client_entry(snode, &snode->granted, clent);
+		scoutfs_tseq_add(&inf->tseq_tree, &clent->tseq_entry);
 
 		put_server_lock(inf, snode);
 
-		/* make sure next core seq is greater than all lock write seq */
-		scoutfs_server_set_seq_if_greater(sb,
-				le64_to_cpu(nlr->locks[i].write_seq));
+		/* make sure next write lock is greater than all recovered */
+		set_max_write_version(inf,
+				le64_to_cpu(nlr->locks[i].write_version));
 	}
 
 	/* send request for next batch of keys */
@@ -698,16 +759,102 @@ out:
 	return ret;
 }
 
+static int get_rid_and_put_ref(struct scoutfs_btree_item_ref *iref, u64 *rid)
+{
+	int ret;
+
+	if (iref->val_len == 0) {
+		*rid = le64_to_cpu(iref->key->sklc_rid);
+		ret = 0;
+	} else {
+		ret = -EIO;
+	}
+	scoutfs_btree_put_iref(iref);
+	return ret;
+}
+
+/*
+ * This work executes if enough time passes without all of the clients
+ * finishing with recovery and canceling the work.  We walk through the
+ * client records and find any that still have their recovery pending.
+ */
+static void scoutfs_lock_server_recovery_timeout(struct work_struct *work)
+{
+	struct lock_server_info *inf = container_of(work,
+						    struct lock_server_info,
+						    recovery_dwork.work);
+	struct super_block *sb = inf->sb;
+	struct scoutfs_super_block *super = &SCOUTFS_SB(sb)->super;
+	SCOUTFS_BTREE_ITEM_REF(iref);
+	struct scoutfs_key key;
+	bool timed_out;
+	u64 rid;
+	int ret;
+
+	ret = scoutfs_server_hold_commit(sb);
+	if (ret)
+		goto out;
+
+	/* we enter recovery if there are any client records */
+	for (rid = 0; ; rid++) {
+		init_lock_clients_key(&key, rid);
+		ret = scoutfs_btree_next(sb, &super->lock_clients, &key, &iref);
+		if (ret == -ENOENT) {
+			ret = 0;
+			break;
+		}
+		if (ret == 0)
+			ret = get_rid_and_put_ref(&iref, &rid);
+		if (ret < 0)
+			break;
+
+		spin_lock(&inf->lock);
+		if (scoutfs_spbm_test(&inf->recovery_pending, rid)) {
+			scoutfs_spbm_clear(&inf->recovery_pending, rid);
+			timed_out = true;
+		} else {
+			timed_out = false;
+		}
+		spin_unlock(&inf->lock);
+
+		if (!timed_out)
+			continue;
+
+		scoutfs_err(sb, "client rid %016llx lock recovery timed out",
+			    rid);
+
+		init_lock_clients_key(&key, rid);
+		ret = scoutfs_btree_delete(sb, inf->alloc, inf->wri,
+					   &super->lock_clients, &key);
+		if (ret)
+			break;
+	}
+
+	ret = scoutfs_server_apply_commit(sb, ret);
+out:
+	/* force processing all pending lock requests */
+	if (ret == 0)
+		ret = finished_recovery(sb, 0, false);
+
+	if (ret < 0) {
+		scoutfs_err(sb, "lock server saw err %d while timing out clients, shutting down", ret);
+		scoutfs_server_abort(sb);
+	}
+}
+
 /*
  * A client is leaving the lock service.  They aren't using locks and
  * won't send any more requests.  We tear down all the state we had for
  * them.  This can be called multiple times for a given client as their
  * farewell is resent to new servers.  It's OK to not find any state.
+ * If we fail to delete a persistent entry then we have to shut down and
+ * hope that the next server has more luck.
  */
 int scoutfs_lock_server_farewell(struct super_block *sb, u64 rid)
 {
 	DECLARE_LOCK_SERVER_INFO(sb, inf);
-	struct client_lock_entry *c_ent;
+	struct scoutfs_super_block *super = &SCOUTFS_SB(sb)->super;
+	struct client_lock_entry *clent;
 	struct client_lock_entry *tmp;
 	struct server_lock_node *snode;
 	struct scoutfs_key key;
@@ -715,7 +862,20 @@ int scoutfs_lock_server_farewell(struct super_block *sb, u64 rid)
 	bool freed;
 	int ret = 0;
 
+	mutex_lock(&inf->mutex);
+	init_lock_clients_key(&key, rid);
+	ret = scoutfs_btree_delete(sb, inf->alloc, inf->wri,
+				   &super->lock_clients, &key);
+	mutex_unlock(&inf->mutex);
+	if (ret == -ENOENT) {
+		ret = 0;
+		goto out;
+	}
+	if (ret < 0)
+		goto out;
+
 	scoutfs_key_set_zeros(&key);
+
 	while ((snode = get_server_lock(inf, &key, NULL, true))) {
 
 		freed = false;
@@ -724,9 +884,9 @@ int scoutfs_lock_server_farewell(struct super_block *sb, u64 rid)
 			    (list == &snode->requested) ? &snode->invalidated :
 			    NULL) {
 
-			list_for_each_entry_safe(c_ent, tmp, list, head) {
-				if (c_ent->rid == rid) {
-					free_client_entry(inf, snode, c_ent);
+			list_for_each_entry_safe(clent, tmp, list, head) {
+				if (clent->rid == rid) {
+					free_client_entry(inf, snode, clent);
 					freed = true;
 				}
 			}
@@ -749,7 +909,7 @@ out:
 	if (ret < 0) {
 		scoutfs_err(sb, "lock server err %d during client rid %016llx farewell, shutting down",
 			    ret, rid);
-		scoutfs_server_stop(sb);
+		scoutfs_server_abort(sb);
 	}
 
 	return ret;
@@ -787,35 +947,36 @@ static char *lock_on_list_string(u8 on_list)
 static void lock_server_tseq_show(struct seq_file *m,
 				  struct scoutfs_tseq_entry *ent)
 {
-	struct client_lock_entry *c_ent = container_of(ent,
+	struct client_lock_entry *clent = container_of(ent,
 						       struct client_lock_entry,
 						       tseq_entry);
-	struct server_lock_node *snode = c_ent->snode;
+	struct server_lock_node *snode = clent->snode;
 
 	seq_printf(m, SK_FMT" %s %s rid %016llx net_id %llu\n",
-		   SK_ARG(&snode->key), lock_mode_string(c_ent->mode),
-		   lock_on_list_string(c_ent->on_list), c_ent->rid,
-		   c_ent->net_id);
-}
-
-static void stats_tseq_show(struct seq_file *m, struct scoutfs_tseq_entry *ent)
-{
-	struct server_lock_node *snode = container_of(ent, struct server_lock_node,
-						      stats_tseq_entry);
-
-	seq_printf(m, SK_FMT" req %llu inv %llu rsp %llu gr %llu\n",
-		   SK_ARG(&snode->key), snode->stats[SLT_REQUEST], snode->stats[SLT_INVALIDATE],
-		   snode->stats[SLT_RESPONSE], snode->stats[SLT_GRANT]);
+		   SK_ARG(&snode->key), lock_mode_string(clent->mode),
+		   lock_on_list_string(clent->on_list), clent->rid,
+		   clent->net_id);
 }
 
 /*
  * Setup the lock server.  This is called before networking can deliver
- * requests.
+ * requests.  If we find existing client records then we enter recovery.
+ * Lock request processing is deferred until recovery is resolved for
+ * all the existing clients, either they reconnect and replay locks or
+ * we time them out.
  */
-int scoutfs_lock_server_setup(struct super_block *sb)
+int scoutfs_lock_server_setup(struct super_block *sb,
+			      struct scoutfs_alloc *alloc,
+			      struct scoutfs_block_writer *wri, u64 max_vers)
 {
 	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
+	struct scoutfs_super_block *super = &SCOUTFS_SB(sb)->super;
 	struct lock_server_info *inf;
+	SCOUTFS_BTREE_ITEM_REF(iref);
+	struct scoutfs_key key;
+	unsigned int nr;
+	u64 rid;
+	int ret;
 
 	inf = kzalloc(sizeof(struct lock_server_info), GFP_KERNEL);
 	if (!inf)
@@ -823,9 +984,15 @@ int scoutfs_lock_server_setup(struct super_block *sb)
 
 	inf->sb = sb;
 	spin_lock_init(&inf->lock);
+	mutex_init(&inf->mutex);
 	inf->locks_root = RB_ROOT;
+	scoutfs_spbm_init(&inf->recovery_pending);
+	INIT_DELAYED_WORK(&inf->recovery_dwork,
+			  scoutfs_lock_server_recovery_timeout);
 	scoutfs_tseq_tree_init(&inf->tseq_tree, lock_server_tseq_show);
-	scoutfs_tseq_tree_init(&inf->stats_tseq_tree, stats_tseq_show);
+	inf->alloc = alloc;
+	inf->wri = wri;
+	atomic64_set(&inf->write_version, max_vers); /* inc_return gives +1 */
 
 	inf->tseq_dentry = scoutfs_tseq_create("server_locks", sbi->debug_root,
 					       &inf->tseq_tree);
@@ -834,17 +1001,38 @@ int scoutfs_lock_server_setup(struct super_block *sb)
 		return -ENOMEM;
 	}
 
-	inf->stats_tseq_dentry = scoutfs_tseq_create("server_lock_stats", sbi->debug_root,
-						     &inf->stats_tseq_tree);
-	if (!inf->stats_tseq_dentry) {
-		debugfs_remove(inf->tseq_dentry);
-		kfree(inf);
-		return -ENOMEM;
-	}
-
 	sbi->lock_server_info = inf;
 
-	return 0;
+	/* we enter recovery if there are any client records */
+	nr = 0;
+	for (rid = 0; ; rid++) {
+		init_lock_clients_key(&key, rid);
+		ret = scoutfs_btree_next(sb, &super->lock_clients, &key, &iref);
+		if (ret == -ENOENT)
+			break;
+		if (ret == 0)
+			ret = get_rid_and_put_ref(&iref, &rid);
+		if (ret < 0)
+			goto out;
+
+		ret = scoutfs_spbm_set(&inf->recovery_pending, rid);
+		if (ret)
+			goto out;
+		nr++;
+
+		if (rid == U64_MAX)
+			break;
+	}
+	ret = 0;
+
+	if (nr) {
+		schedule_delayed_work(&inf->recovery_dwork,
+				msecs_to_jiffies(LOCK_SERVER_RECOVERY_MS));
+		scoutfs_info(sb, "waiting for %u lock clients to recover", nr);
+	}
+
+out:
+	return ret;
 }
 
 /*
@@ -857,13 +1045,14 @@ void scoutfs_lock_server_destroy(struct super_block *sb)
 	DECLARE_LOCK_SERVER_INFO(sb, inf);
 	struct server_lock_node *snode;
 	struct server_lock_node *stmp;
-	struct client_lock_entry *c_ent;
+	struct client_lock_entry *clent;
 	struct client_lock_entry *ctmp;
 	LIST_HEAD(list);
 
 	if (inf) {
+		cancel_delayed_work_sync(&inf->recovery_dwork);
+
 		debugfs_remove(inf->tseq_dentry);
-		debugfs_remove(inf->stats_tseq_dentry);
 
 		rbtree_postorder_for_each_entry_safe(snode, stmp,
 						     &inf->locks_root, node) {
@@ -873,14 +1062,16 @@ void scoutfs_lock_server_destroy(struct super_block *sb)
 			list_splice_init(&snode->invalidated, &list);
 
 			mutex_lock(&snode->mutex);
-			list_for_each_entry_safe(c_ent, ctmp, &list, head) {
-				free_client_entry(inf, snode, c_ent);
+			list_for_each_entry_safe(clent, ctmp, &list, head) {
+				free_client_entry(inf, snode, clent);
 			}
 			mutex_unlock(&snode->mutex);
 
 			kfree(snode);
 		}
 
+		scoutfs_spbm_destroy(&inf->recovery_pending);
+
 		kfree(inf);
 		sbi->lock_server_info = NULL;
 	}

kmod/src/lock_server.h

@@ -3,15 +3,17 @@
 
 int scoutfs_lock_server_recover_response(struct super_block *sb, u64 rid,
 					 struct scoutfs_net_lock_recover *nlr);
-int scoutfs_lock_server_finished_recovery(struct super_block *sb);
 int scoutfs_lock_server_request(struct super_block *sb, u64 rid,
 				u64 net_id, struct scoutfs_net_lock *nl);
-int scoutfs_lock_server_greeting(struct super_block *sb, u64 rid);
+int scoutfs_lock_server_greeting(struct super_block *sb, u64 rid,
+				 bool should_exist);
 int scoutfs_lock_server_response(struct super_block *sb, u64 rid,
 				 struct scoutfs_net_lock *nl);
 int scoutfs_lock_server_farewell(struct super_block *sb, u64 rid);
 
-int scoutfs_lock_server_setup(struct super_block *sb);
+int scoutfs_lock_server_setup(struct super_block *sb,
+			      struct scoutfs_alloc *alloc,
+			      struct scoutfs_block_writer *wri, u64 max_vers);
 void scoutfs_lock_server_destroy(struct super_block *sb);
 
 #endif

kmod/src/msg.h

@@ -4,7 +4,6 @@
 #include <linux/bitops.h>
 #include "key.h"
 #include "counters.h"
-#include "super.h"
 
 void __printf(4, 5) scoutfs_msg(struct super_block *sb, const char *prefix,
 				const char *str, const char *fmt, ...);
@@ -24,9 +23,6 @@ do {							\
 #define scoutfs_info(sb, fmt, args...) \
 	scoutfs_msg_check(sb, KERN_INFO, "", fmt, ##args)
 
-#define scoutfs_tprintk(sb, fmt, args...) \
-	trace_printk(SCSBF " " fmt "\n", SCSB_ARGS(sb), ##args);
-
 #define scoutfs_bug_on(sb, cond, fmt, args...)				\
 do {									\
 	if (cond) {							\

kmod/src/net.c

@@ -30,7 +30,6 @@
 #include "net.h"
 #include "endian_swap.h"
 #include "tseq.h"
-#include "fence.h"
 
 /*
  * scoutfs networking delivers requests and responses between nodes.
@@ -331,9 +330,6 @@ static int submit_send(struct super_block *sb,
 	    WARN_ON_ONCE(id == 0 && (flags & SCOUTFS_NET_FLAG_RESPONSE)))
 		return -EINVAL;
 
-	if (scoutfs_forcing_unmount(sb))
-		return -EIO;
-
 	msend = kmalloc(offsetof(struct message_send,
 				 nh.data[data_len]), GFP_NOFS);
 	if (!msend)
@@ -355,7 +351,6 @@ static int submit_send(struct super_block *sb,
 		}
 		if (rid != 0) {
 			spin_unlock(&conn->lock);
-			kfree(msend);
 			return -ENOTCONN;
 		}
 	}
@@ -425,16 +420,6 @@ static int process_request(struct scoutfs_net_connection *conn,
 			mrecv->nh.data, le16_to_cpu(mrecv->nh.data_len));
 }
 
-static int call_resp_func(struct super_block *sb, struct scoutfs_net_connection *conn,
-			  scoutfs_net_response_t resp_func, void *resp_data,
-			  void *resp, unsigned int resp_len, int error)
-{
-	if (resp_func)
-		return resp_func(sb, conn, resp, resp_len, error, resp_data);
-	else
-		return 0;
-}
-
 /*
  * An incoming response finds the queued request and calls its response
  * function.  The response function for a given request will only be
@@ -449,6 +434,7 @@ static int process_response(struct scoutfs_net_connection *conn,
 	struct message_send *msend;
 	scoutfs_net_response_t resp_func = NULL;
 	void *resp_data;
+	int ret = 0;
 
 	spin_lock(&conn->lock);
 
@@ -463,8 +449,11 @@ static int process_response(struct scoutfs_net_connection *conn,
 
 	spin_unlock(&conn->lock);
 
-	return call_resp_func(sb, conn, resp_func, resp_data, mrecv->nh.data,
-			      le16_to_cpu(mrecv->nh.data_len), net_err_to_host(mrecv->nh.error));
+	if (resp_func)
+		ret = resp_func(sb, conn, mrecv->nh.data,
+				le16_to_cpu(mrecv->nh.data_len),
+				net_err_to_host(mrecv->nh.error), resp_data);
+	return ret;
 }
 
 /*
@@ -549,16 +538,12 @@ static int recvmsg_full(struct socket *sock, void *buf, unsigned len)
 
 	while (len) {
 		memset(&msg, 0, sizeof(msg));
+		msg.msg_iov = (struct iovec *)&kv;
+		msg.msg_iovlen = 1;
 		msg.msg_flags = MSG_NOSIGNAL;
 		kv.iov_base = buf;
 		kv.iov_len = len;
 
-#ifndef KC_MSGHDR_STRUCT_IOV_ITER
-		msg.msg_iov = (struct iovec *)&kv;
-		msg.msg_iovlen = 1;
-#else
-		iov_iter_init(&msg.msg_iter, READ, (struct iovec *)&kv, len, 1);
-#endif
 		ret = kernel_recvmsg(sock, &msg, &kv, 1, len, msg.msg_flags);
 		if (ret <= 0)
 			return -ECONNABORTED;
@@ -634,6 +619,8 @@ static void scoutfs_net_recv_worker(struct work_struct *work)
 			break;
 		}
 
+		trace_scoutfs_recv_clock_sync(nh.clock_sync_id);
+
 		data_len = le16_to_cpu(nh.data_len);
 
 		scoutfs_inc_counter(sb, net_recv_messages);
@@ -680,15 +667,8 @@ static void scoutfs_net_recv_worker(struct work_struct *work)
 
 		scoutfs_tseq_add(&ninf->msg_tseq_tree, &mrecv->tseq_entry);
 
-		/*
-		 * Initial received greetings are processed
-		 * synchronously before any other incoming messages.
-		 *
-		 * Incoming requests or responses to the lock client are
-		 * called synchronously to avoid reordering.
-		 */
-		if (nh.cmd == SCOUTFS_NET_CMD_GREETING ||
-		    (nh.cmd == SCOUTFS_NET_CMD_LOCK && !conn->listening_conn))
+		/* synchronously process greeting before next recvmsg */
+		if (nh.cmd == SCOUTFS_NET_CMD_GREETING)
 			scoutfs_net_proc_worker(&mrecv->proc_work);
 		else
 			queue_work(conn->workq, &mrecv->proc_work);
@@ -711,16 +691,12 @@ static int sendmsg_full(struct socket *sock, void *buf, unsigned len)
 
 	while (len) {
 		memset(&msg, 0, sizeof(msg));
+		msg.msg_iov = (struct iovec *)&kv;
+		msg.msg_iovlen = 1;
 		msg.msg_flags = MSG_NOSIGNAL;
 		kv.iov_base = buf;
 		kv.iov_len = len;
 
-#ifndef KC_MSGHDR_STRUCT_IOV_ITER
-		msg.msg_iov = (struct iovec *)&kv;
-		msg.msg_iovlen = 1;
-#else
-		iov_iter_init(&msg.msg_iter, WRITE, (struct iovec *)&kv, len, 1);
-#endif
 		ret = kernel_sendmsg(sock, &msg, &kv, 1, len);
 		if (ret <= 0)
 			return -ECONNABORTED;
@@ -792,6 +768,9 @@ static void scoutfs_net_send_worker(struct work_struct *work)
 		trace_scoutfs_net_send_message(sb, &conn->sockname,
 					       &conn->peername, &msend->nh);
 
+		msend->nh.clock_sync_id = scoutfs_clock_sync_id();
+		trace_scoutfs_send_clock_sync(msend->nh.clock_sync_id);
+
 		ret = sendmsg_full(conn->sock, &msend->nh, len);
 
 		spin_lock(&conn->lock);
@@ -844,9 +823,11 @@ static void scoutfs_net_destroy_worker(struct work_struct *work)
 	if (conn->listening_conn && conn->notify_down)
 		conn->notify_down(sb, conn, conn->info, conn->rid);
 
+	/* free all messages, refactor and complete for forced unmount? */
 	list_splice_init(&conn->resend_queue, &conn->send_queue);
-	list_for_each_entry_safe(msend, tmp, &conn->send_queue, head)
+	list_for_each_entry_safe(msend, tmp, &conn->send_queue, head) {
 		free_msend(ninf, msend);
+	}
 
 	/* accepted sockets are removed from their listener's list */
 	if (conn->listening_conn) {
@@ -876,39 +857,22 @@ static void destroy_conn(struct scoutfs_net_connection *conn)
 }
 
 /*
- * By default, TCP would maintain a connection to an unresponsive peer
- * for a very long time indeed.   We can't do that because quorum
- * members will only participate in an election when they don't have a
- * healthy connection to a server.  We use the KEEPALIVE* and
- * TCP_USER_TIMEOUT options to ensure that we'll break an unresponsive
- * connection and return to the quorum and client connection paths to
- * try and establish a new connection to an active server.
- *
- * The TCP_KEEP* and TCP_USER_TIMEOUT option interaction is subtle.
- * TCP_USER_TIMEOUT only applies if there is unacked written data in the
- * send queue.  It doesn't work if the connection is idle.  Adding
- * keepalice probes with user_timeout set changes how the keepalive
- * timeout is calculated.   CNT no longer matters.   Each time
- * additional probes (not the first) are sent the user timeout is
- * checked against the last time data was received.  If none of the
- * keepalives are responded to then eventually the user timeout applies.
- *
- * Given all this, we start with the overall unresponsive timeout.  Then
- * we set the probes to start sending towards the end of the timeout.
- * We give it a few tries for a successful response before the timeout
- * elapses during the probe timer processing after the unsuccessful
- * probes.
+ * Have a pretty aggressive keepalive timeout of around 10 seconds.  The
+ * TCP keepalives are being processed out of task context so they should
+ * be responsive even when mounts are under load.
  */
-#define UNRESPONSIVE_TIMEOUT_SECS 10
-#define UNRESPONSIVE_PROBES 3
+#define KEEPCNT			3
+#define KEEPIDLE		7
+#define KEEPINTVL		1
 static int sock_opts_and_names(struct scoutfs_net_connection *conn,
 			       struct socket *sock)
 {
 	struct timeval tv;
+	int addrlen;
 	int optval;
 	int ret;
 
-	/* we use a keepalive timeout instead of send timeout */
+	/* but use a keepalive timeout instead of send timeout */
 	tv.tv_sec = 0;
 	tv.tv_usec = 0;
 	ret = kernel_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO,
@@ -916,32 +880,24 @@ static int sock_opts_and_names(struct scoutfs_net_connection *conn,
 	if (ret)
 		goto out;
 
-	/* not checked when user_timeout != 0, but for clarity */
-	optval = UNRESPONSIVE_PROBES;
+	optval = KEEPCNT;
 	ret = kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
 				(char *)&optval, sizeof(optval));
 	if (ret)
 		goto out;
 
-	BUILD_BUG_ON(UNRESPONSIVE_PROBES >= UNRESPONSIVE_TIMEOUT_SECS);
-	optval = UNRESPONSIVE_TIMEOUT_SECS - (UNRESPONSIVE_PROBES);
+	optval = KEEPIDLE;
 	ret = kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
 				(char *)&optval, sizeof(optval));
 	if (ret)
 		goto out;
 
-	optval = 1;
+	optval = KEEPINTVL;
 	ret = kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
 				(char *)&optval, sizeof(optval));
 	if (ret)
 		goto out;
 
-	optval = UNRESPONSIVE_TIMEOUT_SECS * MSEC_PER_SEC;
-	ret = kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT,
-				(char *)&optval, sizeof(optval));
-	if (ret)
-		goto out;
-
 	optval = 1;
 	ret = kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
 				(char *)&optval, sizeof(optval));
@@ -954,18 +910,21 @@ static int sock_opts_and_names(struct scoutfs_net_connection *conn,
 	if (ret)
 		goto out;
 
-	ret = kc_kernel_getsockname(sock, (struct sockaddr *)&conn->sockname);
-	if (ret < 0)
+	addrlen = sizeof(struct sockaddr_in);
+	ret = kernel_getsockname(sock, (struct sockaddr *)&conn->sockname,
+				 &addrlen);
+	if (ret == 0 && addrlen != sizeof(struct sockaddr_in))
+		ret = -EAFNOSUPPORT;
+	if (ret)
 		goto out;
 
-	ret = kc_kernel_getpeername(sock, (struct sockaddr *)&conn->peername);
-	if (ret < 0)
+	addrlen = sizeof(struct sockaddr_in);
+	ret = kernel_getpeername(sock, (struct sockaddr *)&conn->peername,
+				 &addrlen);
+	if (ret == 0 && addrlen != sizeof(struct sockaddr_in))
+		ret = -EAFNOSUPPORT;
+	if (ret)
 		goto out;
-
-	ret = 0;
-
-	conn->last_peername = conn->peername;
-
 out:
 	return ret;
 }
@@ -985,6 +944,7 @@ static void scoutfs_net_listen_worker(struct work_struct *work)
 	struct scoutfs_net_connection *acc_conn;
 	DECLARE_WAIT_QUEUE_HEAD(waitq);
 	struct socket *acc_sock;
+	LIST_HEAD(conn_list);
 	int ret;
 
 	trace_scoutfs_net_listen_work_enter(sb, 0, 0);
@@ -994,8 +954,6 @@ static void scoutfs_net_listen_worker(struct work_struct *work)
 		if (ret < 0)
 			break;
 
-		acc_sock->sk->sk_allocation = GFP_NOFS;
-
 		/* inherit accepted request funcs from listening conn */
 		acc_conn = scoutfs_net_alloc_conn(sb, conn->notify_up,
 						  conn->notify_down,
@@ -1054,12 +1012,10 @@ static void scoutfs_net_connect_worker(struct work_struct *work)
 
 	trace_scoutfs_net_connect_work_enter(sb, 0, 0);
 
-	ret = kc_sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
+	ret = sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
 	if (ret)
 		goto out;
 
-	sock->sk->sk_allocation = GFP_NOFS;
-
 	/* caller specified connect timeout */
 	tv.tv_sec = conn->connect_timeout_ms / MSEC_PER_SEC;
 	tv.tv_usec = (conn->connect_timeout_ms % MSEC_PER_SEC) * USEC_PER_MSEC;
@@ -1133,11 +1089,9 @@ static void scoutfs_net_shutdown_worker(struct work_struct *work)
 	struct net_info *ninf = SCOUTFS_SB(sb)->net_info;
 	struct scoutfs_net_connection *listener;
 	struct scoutfs_net_connection *acc_conn;
-	scoutfs_net_response_t resp_func;
 	struct message_send *msend;
 	struct message_send *tmp;
 	unsigned long delay;
-	void *resp_data;
 
 	trace_scoutfs_net_shutdown_work_enter(sb, 0, 0);
 	trace_scoutfs_conn_shutdown_start(conn);
@@ -1183,30 +1137,6 @@ static void scoutfs_net_shutdown_worker(struct work_struct *work)
 	/* and wait for accepted conn shutdown work to finish */
 	wait_event(conn->waitq, empty_accepted_list(conn));
 
-	/*
-	 * Forced unmount will cause net submit to fail once it's
-	 * started and it calls shutdown to interrupt any previous
-	 * senders waiting for a response.   The response callbacks can
-	 * do quite a lot of work so we're careful to call them outside
-	 * the lock.
-	 */
-	if (scoutfs_forcing_unmount(sb)) {
-		spin_lock(&conn->lock);
-		list_splice_tail_init(&conn->send_queue, &conn->resend_queue);
-		while ((msend = list_first_entry_or_null(&conn->resend_queue,
-							struct message_send, head))) {
-			resp_func = msend->resp_func;
-			resp_data = msend->resp_data;
-			free_msend(ninf, msend);
-			spin_unlock(&conn->lock);
-
-			call_resp_func(sb, conn, resp_func, resp_data, NULL, 0, -ECONNABORTED);
-
-			spin_lock(&conn->lock);
-		}
-		spin_unlock(&conn->lock);
-	}
-
 	spin_lock(&conn->lock);
 
 	/* greetings aren't resent across sockets */
@@ -1276,7 +1206,6 @@ static void scoutfs_net_reconn_free_worker(struct work_struct *work)
 	unsigned long now = jiffies;
 	unsigned long deadline = 0;
 	bool requeue = false;
-	int ret;
 
 	trace_scoutfs_net_reconn_free_work_enter(sb, 0, 0);
 
@@ -1290,18 +1219,10 @@ restart:
 		     time_after_eq(now, acc->reconn_deadline))) {
 			set_conn_fl(acc, reconn_freeing);
 			spin_unlock(&conn->lock);
-			if (!test_conn_fl(conn, shutting_down)) {
-				scoutfs_info(sb, "client "SIN_FMT" reconnect timed out, fencing",
-					     SIN_ARG(&acc->last_peername));
-				ret = scoutfs_fence_start(sb, acc->rid,
-						acc->last_peername.sin_addr.s_addr,
-						SCOUTFS_FENCE_CLIENT_RECONNECT);
-				if (ret) {
-					scoutfs_err(sb, "client fence returned err %d, shutting down server",
-						    ret);
-					scoutfs_server_stop(sb);
-				}
-			}
+			if (!test_conn_fl(conn, shutting_down))
+				scoutfs_info(sb, "client timed out "SIN_FMT" -> "SIN_FMT", can not reconnect",
+					     SIN_ARG(&acc->sockname),
+					     SIN_ARG(&acc->peername));
 			destroy_conn(acc);
 			goto restart;
 		}
@@ -1348,12 +1269,10 @@ scoutfs_net_alloc_conn(struct super_block *sb,
 	if (!conn)
 		return NULL;
 
-	if (info_size) {
-		conn->info = kzalloc(info_size, GFP_NOFS);
-		if (!conn->info) {
-			kfree(conn);
-			return NULL;
-		}
+	conn->info = kzalloc(info_size, GFP_NOFS);
+	if (!conn->info) {
+		kfree(conn);
+		return NULL;
 	}
 
 	conn->workq = alloc_workqueue("scoutfs_net_%s",
@@ -1374,7 +1293,6 @@ scoutfs_net_alloc_conn(struct super_block *sb,
 	init_waitqueue_head(&conn->waitq);
 	conn->sockname.sin_family = AF_INET;
 	conn->peername.sin_family = AF_INET;
-	conn->last_peername.sin_family = AF_INET;
 	INIT_LIST_HEAD(&conn->accepted_head);
 	INIT_LIST_HEAD(&conn->accepted_list);
 	conn->next_send_seq = 1;
@@ -1455,12 +1373,10 @@ int scoutfs_net_bind(struct super_block *sb,
 	if (WARN_ON_ONCE(conn->sock))
 		return -EINVAL;
 
-	ret = kc_sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
+	ret = sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
 	if (ret)
 		goto out;
 
-	sock->sk->sk_allocation = GFP_NOFS;
-
 	optval = 1;
 	ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 				(char *)&optval, sizeof(optval));
@@ -1473,18 +1389,20 @@ int scoutfs_net_bind(struct super_block *sb,
 		goto out;
 
 	ret = kernel_listen(sock, 255);
-	if (ret < 0)
+	if (ret)
 		goto out;
 
-	ret = kc_kernel_getsockname(sock, (struct sockaddr *)&conn->sockname);
-	if (ret < 0)
+	addrlen = sizeof(struct sockaddr_in);
+	ret = kernel_getsockname(sock, (struct sockaddr *)&conn->sockname,
+				 &addrlen);
+	if (ret == 0 && addrlen != sizeof(struct sockaddr_in))
+		ret = -EAFNOSUPPORT;
+	if (ret)
 		goto out;
 
-	ret = 0;
-
 	conn->sock = sock;
 	*sin = conn->sockname;
-
+	ret = 0;
 out:
 	if (ret < 0 && sock)
 		sock_release(sock);
@@ -1541,7 +1459,8 @@ int scoutfs_net_connect(struct super_block *sb,
 			struct scoutfs_net_connection *conn,
 			struct sockaddr_in *sin, unsigned long timeout_ms)
 {
-	int ret = 0;
+	int error = 0;
+	int ret;
 
 	spin_lock(&conn->lock);
 	conn->connect_sin = *sin;
@@ -1549,8 +1468,10 @@ int scoutfs_net_connect(struct super_block *sb,
 	spin_unlock(&conn->lock);
 
 	queue_work(conn->workq, &conn->connect_work);
-	wait_event(conn->waitq, connect_result(conn, &ret));
-	return ret;
+
+	ret = wait_event_interruptible(conn->waitq,
+				       connect_result(conn, &error));
+	return ret ?: error;
 }
 
 static void set_valid_greeting(struct scoutfs_net_connection *conn)
@@ -1686,10 +1607,10 @@ restart:
 		conn->next_send_id = reconn->next_send_id;
 		atomic64_set(&conn->recv_seq, atomic64_read(&reconn->recv_seq));
 
-		/* reconn should be idle while in reconn_wait  */
+		/* greeting response/ack will be on conn send queue */
 		BUG_ON(!list_empty(&reconn->send_queue));
-		/* queued greeting response is racing, can be in send or resend queue */
-		list_splice_tail_init(&reconn->resend_queue, &conn->resend_queue);
+		BUG_ON(!list_empty(&conn->resend_queue));
+		list_splice_init(&reconn->resend_queue, &conn->resend_queue);
 
 		/* new conn info is unused, swap, old won't call down */
 		swap(conn->info, reconn->info);
@@ -1781,6 +1702,23 @@ int scoutfs_net_response_node(struct super_block *sb,
 			   NULL, NULL, NULL);
 }
 
+/*
+ * The response function that was submitted with the request is not
+ * called if the request is canceled here.
+ */
+void scoutfs_net_cancel_request(struct super_block *sb,
+				struct scoutfs_net_connection *conn,
+				u8 cmd, u64 id)
+{
+	struct message_send *msend;
+
+	spin_lock(&conn->lock);
+	msend = find_request(conn, cmd, id);
+	if (msend)
+		complete_send(conn, msend);
+	spin_unlock(&conn->lock);
+}
+
 struct sync_request_completion {
 	struct completion comp;
 	void *resp;
@@ -1836,10 +1774,11 @@ int scoutfs_net_sync_request(struct super_block *sb,
 	ret = scoutfs_net_submit_request(sb, conn, cmd, arg, arg_len,
 					 sync_response, &sreq, &id);
 
-	if (ret == 0) {
-		wait_for_completion(&sreq.comp);
+	ret = wait_for_completion_interruptible(&sreq.comp);
+	if (ret == -ERESTARTSYS)
+		scoutfs_net_cancel_request(sb, conn, cmd, id);
+	else
 		ret = sreq.error;
-	}
 
 	return ret;
 }

kmod/src/net.h

@@ -49,7 +49,6 @@ struct scoutfs_net_connection {
 	u64 greeting_id;
 	struct sockaddr_in sockname;
 	struct sockaddr_in peername;
-	struct sockaddr_in last_peername;
 
 	struct list_head accepted_head;
 	struct scoutfs_net_connection *listening_conn;
@@ -100,16 +99,6 @@ static inline void scoutfs_addr_to_sin(struct sockaddr_in *sin,
 	sin->sin_port = cpu_to_be16(le16_to_cpu(addr->v4.port));
 }
 
-static inline void scoutfs_sin_to_addr(union scoutfs_inet_addr *addr, struct sockaddr_in *sin)
-{
-	BUG_ON(sin->sin_family != AF_INET);
-
-	memset(addr, 0, sizeof(union scoutfs_inet_addr));
-	addr->v4.family = cpu_to_le16(SCOUTFS_AF_IPV4);
-	addr->v4.addr = be32_to_le32(sin->sin_addr.s_addr);
-	addr->v4.port = be16_to_le16(sin->sin_port);
-}
-
 struct scoutfs_net_connection *
 scoutfs_net_alloc_conn(struct super_block *sb,
 		       scoutfs_net_notify_t notify_up,
@@ -134,6 +123,9 @@ int scoutfs_net_submit_request_node(struct super_block *sb,
 				    u64 rid, u8 cmd, void *arg, u16 arg_len,
 				    scoutfs_net_response_t resp_func,
 				    void *resp_data, u64 *id_ret);
+void scoutfs_net_cancel_request(struct super_block *sb,
+				struct scoutfs_net_connection *conn,
+				u8 cmd, u64 id);
 int scoutfs_net_sync_request(struct super_block *sb,
 			     struct scoutfs_net_connection *conn,
 			     u8 cmd, void *arg, unsigned arg_len,

kmod/src/omap.c

@@ -1,889 +0,0 @@
-/*
- * Copyright (C) 2021 Versity Software, Inc.  All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License v2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- */
-#include <linux/kernel.h>
-#include <linux/fs.h>
-#include <linux/slab.h>
-#include <linux/sched.h>
-#include <linux/rhashtable.h>
-#include <linux/rcupdate.h>
-
-#include "format.h"
-#include "counters.h"
-#include "cmp.h"
-#include "inode.h"
-#include "client.h"
-#include "server.h"
-#include "omap.h"
-#include "recov.h"
-#include "scoutfs_trace.h"
-
-/*
- * As a client removes an inode from its cache with an nlink of 0 it
- * needs to decide if it is the last client using the inode and should
- * fully delete all the inode's items.  It needs to know if other mounts
- * still have the inode in use.
- *
- * We need a way to communicate between mounts that an inode is in use.
- * We don't want to pay the synchronous per-file locking round trip
- * costs associated with per-inode open locks that you'd typically see
- * in systems to solve this problem.  The first prototypes of this
- * tracked open file handles so this was coined the open map, though it
- * now tracks cached inodes.
- *
- * Clients maintain bitmaps that cover groups of inodes.  As inodes
- * enter the cache their bit is set and as the inode is evicted the bit
- * is cleared.  As deletion is attempted, either by scanning orphans or
- * evicting an inode with an nlink of 0, messages are sent around the
- * cluster to get the current bitmaps for that inode's group from all
- * active mounts.  If the inode's bit is clear then it can be deleted.
- *
- * This layer maintains a list of client rids to send messages to.  The
- * server calls us as clients enter and leave the cluster.    We can't
- * process requests until all clients are present as a server starts up
- * so we hook into recovery and delay processing until all previously
- * existing clients are recovered or fenced.
- */
-
-struct omap_rid_list {
-	int nr_rids;
-	struct list_head head;
-};
-
-struct omap_rid_entry {
-	struct list_head head;
-	u64 rid;
-};
-
-struct omap_info {
-	/* client */
-	struct rhashtable group_ht;
-
-	/* server */
-	struct rhashtable req_ht;
-	struct llist_head requests;
-	spinlock_t lock;
-	struct omap_rid_list rids;
-	atomic64_t next_req_id;
-};
-
-#define DECLARE_OMAP_INFO(sb, name) \
-	struct omap_info *name = SCOUTFS_SB(sb)->omap_info
-
-/*
- * The presence of an inode in the inode sets its bit in the lock
- * group's bitmap.
- *
- * We don't want to add additional global synchronization of inode cache
- * maintenance so these are tracked in an rcu hash table.  Once their
- * total reaches zero they're removed from the hash and queued for
- * freeing and readers should ignore them.
- */
-struct omap_group {
-	struct super_block *sb;
-	struct rhash_head ht_head;
-	struct rcu_head rcu;
-	u64 nr;
-	spinlock_t lock;
-	unsigned int total;
-	__le64 bits[SCOUTFS_OPEN_INO_MAP_LE64S];
-};
-
-#define trace_group(sb, which, group, bit_nr)						\
-do {											\
-	__typeof__(group) _grp = (group);						\
-	__typeof__(bit_nr) _nr = (bit_nr);						\
-											\
-	trace_scoutfs_omap_group_##which(sb, _grp, _grp->nr, _grp->total, _nr);		\
-} while (0)
-
-/*
- * Each request is initialized with the rids of currently mounted
- * clients.  As each responds we remove their rid and send the response
- * once everyone has contributed.
- *
- * The request frequency will typically be low, but in a mass rm -rf
- * load we will see O(groups * clients) messages flying around.
- */
-struct omap_request {
-	struct llist_node llnode;
-	struct rhash_head ht_head;
-	struct rcu_head rcu;
-	spinlock_t lock;
-	u64 client_rid;
-	u64 client_id;
-	struct omap_rid_list rids;
-	struct scoutfs_open_ino_map map;
-};
-
-static inline void init_rid_list(struct omap_rid_list *list)
-{
-	INIT_LIST_HEAD(&list->head);
-	list->nr_rids = 0;
-}
-
-/*
- * Negative searches almost never happen.
- */
-static struct omap_rid_entry *find_rid(struct omap_rid_list *list, u64 rid)
-{
-	struct omap_rid_entry *entry;
-
-	list_for_each_entry(entry, &list->head, head) {
-		if (rid == entry->rid)
-			return entry;
-	}
-
-	return NULL;
-}
-
-static int free_rid(struct omap_rid_list *list, struct omap_rid_entry *entry)
-{
-	int nr;
-
-	list_del(&entry->head);
-	nr = --list->nr_rids;
-
-	kfree(entry);
-	return nr;
-}
-
-static void free_rid_list(struct omap_rid_list *list)
-{
-	struct omap_rid_entry *entry;
-	struct omap_rid_entry *tmp;
-
-	list_for_each_entry_safe(entry, tmp, &list->head, head)
-		free_rid(list, entry);
-}
-
-static int copy_rids(struct omap_rid_list *to, struct omap_rid_list *from, spinlock_t *from_lock)
-{
-	struct omap_rid_entry *entry;
-	struct omap_rid_entry *src;
-	struct omap_rid_entry *dst;
-	int nr;
-
-	spin_lock(from_lock);
-
-	while (to->nr_rids != from->nr_rids) {
-		nr = from->nr_rids;
-		spin_unlock(from_lock);
-
-		while (to->nr_rids < nr) {
-			entry = kmalloc(sizeof(struct omap_rid_entry), GFP_NOFS);
-			if (!entry)
-				return -ENOMEM;
-
-			list_add_tail(&entry->head, &to->head);
-			to->nr_rids++;
-		}
-
-		while (to->nr_rids > nr) {
-			entry = list_first_entry(&to->head, struct omap_rid_entry, head);
-			list_del(&entry->head);
-			kfree(entry);
-			to->nr_rids--;
-		}
-
-		spin_lock(from_lock);
-	}
-
-	dst = list_first_entry(&to->head, struct omap_rid_entry, head);
-	list_for_each_entry(src, &from->head, head) {
-		dst->rid = src->rid;
-		dst = list_next_entry(dst, head);
-	}
-
-	spin_unlock(from_lock);
-
-	return 0;
-}
-
-static void free_rids(struct omap_rid_list *list)
-{
-	struct omap_rid_entry *entry;
-	struct omap_rid_entry *tmp;
-
-	list_for_each_entry_safe(entry, tmp, &list->head, head) {
-		list_del(&entry->head);
-		kfree(entry);
-	}
-}
-
-void scoutfs_omap_calc_group_nrs(u64 ino, u64 *group_nr, int *bit_nr)
-{
-	*group_nr = ino >> SCOUTFS_OPEN_INO_MAP_SHIFT;
-	*bit_nr = ino & SCOUTFS_OPEN_INO_MAP_MASK;
-}
-
-static struct omap_group *alloc_group(struct super_block *sb, u64 group_nr)
-{
-	struct omap_group *group;
-
-	group = kzalloc(sizeof(struct omap_group), GFP_NOFS);
-	if (group) {
-		group->sb = sb;
-		group->nr = group_nr;
-		spin_lock_init(&group->lock);
-
-		trace_group(sb, alloc, group, -1);
-	}
-
-	return group;
-}
-
-static void free_group(struct super_block *sb, struct omap_group *group)
-{
-	trace_group(sb, free, group, -1);
-	kfree(group);
-}
-
-static void free_group_rcu(struct rcu_head *rcu)
-{
-	struct omap_group *group = container_of(rcu, struct omap_group, rcu);
-
-	free_group(group->sb, group);
-}
-
-static const struct rhashtable_params group_ht_params = {
-        .key_len = member_sizeof(struct omap_group, nr),
-        .key_offset = offsetof(struct omap_group, nr),
-        .head_offset = offsetof(struct omap_group, ht_head),
-};
-
-/*
- * Track an cached inode in its group.  Our set can be racing with a
- * final clear that removes the group from the hash, sets total to
- * UINT_MAX, and calls rcu free.  We can retry until the dead group is
- * no longer visible in the hash table and we can insert a new allocated
- * group.
- *
- * The caller must ensure that the bit is clear, -EEXIST will be
- * returned otherwise.
- */
-int scoutfs_omap_set(struct super_block *sb, u64 ino)
-{
-	DECLARE_OMAP_INFO(sb, ominf);
-	struct omap_group *group;
-	u64 group_nr;
-	int bit_nr;
-	bool found;
-	int ret = 0;
-
-	scoutfs_omap_calc_group_nrs(ino, &group_nr, &bit_nr);
-
-retry:
-	found = false;
-	rcu_read_lock();
-	group = rhashtable_lookup(&ominf->group_ht, &group_nr, group_ht_params);
-	if (group) {
-		spin_lock(&group->lock);
-		if (group->total < UINT_MAX) {
-			found = true;
-			if (WARN_ON_ONCE(test_and_set_bit_le(bit_nr, group->bits)))
-				ret = -EEXIST;
-			else
-				group->total++;
-		}
-		trace_group(sb, inc, group, bit_nr);
-		spin_unlock(&group->lock);
-	}
-	rcu_read_unlock();
-
-	if (!found) {
-		group = alloc_group(sb, group_nr);
-		if (group) {
-			ret = rhashtable_lookup_insert_fast(&ominf->group_ht, &group->ht_head,
-							    group_ht_params);
-			if (ret < 0)
-				free_group(sb, group);
-			if (ret == -EEXIST)
-				ret = 0;
-			if (ret == -EBUSY) {
-				/* wait for rehash to finish */
-				synchronize_rcu();
-				ret = 0;
-			}
-			if (ret == 0)
-				goto retry;
-		} else {
-			ret = -ENOMEM;
-		}
-	}
-
-	return ret;
-}
-
-bool scoutfs_omap_test(struct super_block *sb, u64 ino)
-{
-	DECLARE_OMAP_INFO(sb, ominf);
-	struct omap_group *group;
-	bool ret = false;
-	u64 group_nr;
-	int bit_nr;
-
-	scoutfs_omap_calc_group_nrs(ino, &group_nr, &bit_nr);
-
-	rcu_read_lock();
-	group = rhashtable_lookup(&ominf->group_ht, &group_nr, group_ht_params);
-	if (group) {
-		spin_lock(&group->lock);
-		ret = !!test_bit_le(bit_nr, group->bits);
-		spin_unlock(&group->lock);
-	}
-	rcu_read_unlock();
-
-	return ret;
-}
-
-/*
- * Clear a previously set ino bit.  Trying to clear a bit that's already
- * clear implies imbalanced set/clear or bugs freeing groups.  We only
- * free groups here as the last clear drops the group's total to 0.
- */
-void scoutfs_omap_clear(struct super_block *sb, u64 ino)
-{
-	DECLARE_OMAP_INFO(sb, ominf);
-	struct omap_group *group;
-	u64 group_nr;
-	int bit_nr;
-
-	scoutfs_omap_calc_group_nrs(ino, &group_nr, &bit_nr);
-
-	rcu_read_lock();
-	group = rhashtable_lookup(&ominf->group_ht, &group_nr, group_ht_params);
-	if (group) {
-		spin_lock(&group->lock);
-		WARN_ON_ONCE(!test_bit_le(bit_nr, group->bits));
-		WARN_ON_ONCE(group->total == 0);
-		WARN_ON_ONCE(group->total == UINT_MAX);
-		if (test_and_clear_bit_le(bit_nr, group->bits)) {
-			if (--group->total == 0) {
-				group->total = UINT_MAX;
-				rhashtable_remove_fast(&ominf->group_ht, &group->ht_head,
-						       group_ht_params);
-				call_rcu(&group->rcu, free_group_rcu);
-			}
-		}
-		trace_group(sb, dec, group, bit_nr);
-		spin_unlock(&group->lock);
-	}
-	rcu_read_unlock();
-
-	WARN_ON_ONCE(!group);
-}
-
-/*
- * The server adds rids as it discovers clients.  We add them to the
- * list of rids to send map requests to.
- */
-int scoutfs_omap_add_rid(struct super_block *sb, u64 rid)
-{
-	DECLARE_OMAP_INFO(sb, ominf);
-	struct omap_rid_entry *entry;
-	struct omap_rid_entry *found;
-
-	entry = kmalloc(sizeof(struct omap_rid_entry), GFP_NOFS);
-	if (!entry)
-		return -ENOMEM;
-
-	spin_lock(&ominf->lock);
-	found = find_rid(&ominf->rids, rid);
-	if (!found) {
-		entry->rid = rid;
-		list_add_tail(&entry->head, &ominf->rids.head);
-		ominf->rids.nr_rids++;
-	}
-	spin_unlock(&ominf->lock);
-
-	if (found)
-		kfree(entry);
-
-	return 0;
-}
-
-static void free_req(struct omap_request *req)
-{
-	free_rids(&req->rids);
-	kfree(req);
-}
-
-static void free_req_rcu(struct rcu_head *rcu)
-{
-	struct omap_request *req = container_of(rcu, struct omap_request, rcu);
-
-	free_req(req);
-}
-
-static const struct rhashtable_params req_ht_params = {
-        .key_len = member_sizeof(struct omap_request, map.args.req_id),
-        .key_offset = offsetof(struct omap_request, map.args.req_id),
-        .head_offset = offsetof(struct omap_request, ht_head),
-};
-
-/*
- * Remove a rid from all the pending requests.  If it's the last rid we
- * give the caller the details to send a response, they'll call back to
- * keep removing.  If their send fails they're going to shutdown the
- * server so we can queue freeing the request as we give it to them.
- */
-static int remove_rid_from_reqs(struct omap_info *ominf, u64 rid, u64 *resp_rid, u64 *resp_id,
-				struct scoutfs_open_ino_map *map)
-{
-	struct omap_rid_entry *entry;
-	struct rhashtable_iter iter;
-	struct omap_request *req;
-	int ret = 0;
-
-	rhashtable_walk_enter(&ominf->req_ht, &iter);
-	rhashtable_walk_start(&iter);
-
-	for (;;) {
-		req = rhashtable_walk_next(&iter);
-		if (req == NULL)
-			break;
-		if (req == ERR_PTR(-EAGAIN))
-			continue;
-
-		spin_lock(&req->lock);
-		entry = find_rid(&req->rids, rid);
-		if (entry && free_rid(&req->rids, entry) == 0) {
-			*resp_rid = req->client_rid;
-			*resp_id = req->client_id;
-			memcpy(map, &req->map, sizeof(struct scoutfs_open_ino_map));
-			rhashtable_remove_fast(&ominf->req_ht, &req->ht_head, req_ht_params);
-			call_rcu(&req->rcu, free_req_rcu);
-			ret = 1;
-		}
-		spin_unlock(&req->lock);
-		if (ret > 0)
-			break;
-	}
-
-	rhashtable_walk_stop(&iter);
-	rhashtable_walk_exit(&iter);
-
-	if (ret <= 0) {
-		*resp_rid = 0;
-		*resp_id = 0;
-	}
-
-	return ret;
-}
-
-/*
- * A client has been evicted.  Remove its rid from the list and walk
- * through all the pending requests and remove its rids, sending the
- * response if it was the last rid waiting for a response.
- *
- * If this returns an error then the server will shut down.
- *
- * This can be called multiple times by different servers if there are
- * errors reclaiming an evicted mount, so we allow asking to remove a
- * rid that hasn't been added.
- */
-int scoutfs_omap_remove_rid(struct super_block *sb, u64 rid)
-{
-	DECLARE_OMAP_INFO(sb, ominf);
-	struct scoutfs_open_ino_map *map = NULL;
-	struct omap_rid_entry *entry;
-	u64 resp_rid = 0;
-	u64 resp_id = 0;
-	int ret;
-
-	spin_lock(&ominf->lock);
-	entry = find_rid(&ominf->rids, rid);
-	if (entry)
-		free_rid(&ominf->rids, entry);
-	spin_unlock(&ominf->lock);
-
-	if (!entry) {
-		ret = 0;
-		goto out;
-	}
-
-	map = kmalloc(sizeof(struct scoutfs_open_ino_map), GFP_NOFS);
-	if (!map) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	/* remove the rid from all pending requests, sending responses if it was final */
-	for (;;) {
-		ret = remove_rid_from_reqs(ominf, rid, &resp_rid, &resp_id, map);
-		if (ret <= 0)
-			break;
-		ret = scoutfs_server_send_omap_response(sb, resp_rid, resp_id, map, 0);
-		if (ret < 0)
-			break;
-	}
-
-out:
-	kfree(map);
-	return ret;
-}
-
-/*
- * Handle a single incoming request in the server.  This could have been
- * delayed by recovery.  This only returns an error if we couldn't send
- * a processing error response to the client.
- */
-static int handle_request(struct super_block *sb, struct omap_request *req)
-{
-	DECLARE_OMAP_INFO(sb, ominf);
-	struct omap_rid_list priv_rids;
-	struct omap_rid_entry *entry;
-	int ret;
-
-	init_rid_list(&priv_rids);
-
-	ret = copy_rids(&priv_rids, &ominf->rids, &ominf->lock);
-	if (ret < 0)
-		goto out;
-
-	/* don't send a request to the client who originated this request */
-	entry = find_rid(&priv_rids, req->client_rid);
-	if (entry && free_rid(&priv_rids, entry) == 0) {
-		ret = scoutfs_server_send_omap_response(sb, req->client_rid, req->client_id,
-							&req->map, 0);
-		kfree(req);
-		req = NULL;
-		goto out;
-	}
-
-	/* this lock isn't needed but sparse gave warnings with conditional locking */
-	ret = copy_rids(&req->rids, &priv_rids, &ominf->lock);
-	if (ret < 0)
-		goto out;
-
-	do {
-		ret = rhashtable_insert_fast(&ominf->req_ht, &req->ht_head, req_ht_params);
-		if (ret == -EBUSY)
-			synchronize_rcu(); /* wait for rehash to finish */
-	} while (ret == -EBUSY);
-
-	if (ret < 0)
-		goto out;
-
-	/*
-	 * We can start getting responses the moment we send the first response.  After
-	 * we send the last request the req can be freed.
-	 */
-	while ((entry = list_first_entry_or_null(&priv_rids.head, struct omap_rid_entry, head))) {
-		ret = scoutfs_server_send_omap_request(sb, entry->rid, &req->map.args);
-		if (ret < 0) {
-			rhashtable_remove_fast(&ominf->req_ht, &req->ht_head, req_ht_params);
-			goto out;
-		}
-
-		free_rid(&priv_rids, entry);
-	}
-
-	ret = 0;
-out:
-	free_rids(&priv_rids);
-	if (ret < 0) {
-		ret = scoutfs_server_send_omap_response(sb, req->client_rid, req->client_id,
-							NULL, ret);
-		free_req(req);
-	}
-
-	return ret;
-}
-
-/*
- * Handle all previously received omap requests from clients.  Once
- * we've finished recovery and can send requests to all clients we can
- * handle all pending requests.  The handling function frees the request
- * and only returns an error if it couldn't send a response to the
- * client.
- */
-static int handle_requests(struct super_block *sb)
-{
-	DECLARE_OMAP_INFO(sb, ominf);
-	struct llist_node *requests;
-	struct omap_request *req;
-	struct omap_request *tmp;
-	int ret;
-	int err;
-
-	if (scoutfs_recov_next_pending(sb, 0, SCOUTFS_RECOV_GREETING))
-		return 0;
-
-	ret = 0;
-	requests = llist_del_all(&ominf->requests);
-
-	llist_for_each_entry_safe(req, tmp, requests, llnode) {
-		err = handle_request(sb, req);
-		if (err < 0 && ret == 0)
-			ret = err;
-	}
-
-	return ret;
-}
-
-int scoutfs_omap_finished_recovery(struct super_block *sb)
-{
-	return handle_requests(sb);
-}
-
-/*
- * The server is receiving a request from a client for the bitmap of all
- * open inodes around their ino.  Queue it for processing which is
- * typically immediate and inline but which can be deferred by recovery
- * as the server first starts up.
- */
-int scoutfs_omap_server_handle_request(struct super_block *sb, u64 rid, u64 id,
-				       struct scoutfs_open_ino_map_args *args)
-{
-	DECLARE_OMAP_INFO(sb, ominf);
-	struct omap_request *req;
-
-	req = kzalloc(sizeof(struct omap_request), GFP_NOFS);
-	if (req == NULL)
-		return -ENOMEM;
-
-	spin_lock_init(&req->lock);
-	req->client_rid = rid;
-	req->client_id = id;
-	init_rid_list(&req->rids);
-	req->map.args.group_nr = args->group_nr;
-	req->map.args.req_id = cpu_to_le64(atomic64_inc_return(&ominf->next_req_id));
-
-	llist_add(&req->llnode, &ominf->requests);
-
-	return handle_requests(sb);
-}
-
-/*
- * The client is receiving a request from the server for its map for the
- * given group.  Look up the group and copy the bits to the map.
- *
- * The mount originating the request for this bitmap has the inode group
- * write locked.  We can't be adding links to any inodes in the group
- * because that requires the lock.  Inodes bits can be set and cleared
- * while we're sampling the bitmap.  These races are fine, they can't be
- * adding cached inodes if nlink is 0 and we don't have the lock.  If
- * the caller is removing a set bit then they're about to try and delete
- * the inode themselves and will first have to acquire the cluster lock
- * themselves.
- */
-int scoutfs_omap_client_handle_request(struct super_block *sb, u64 id,
-				       struct scoutfs_open_ino_map_args *args)
-{
-	DECLARE_OMAP_INFO(sb, ominf);
-	u64 group_nr = le64_to_cpu(args->group_nr);
-	struct scoutfs_open_ino_map *map;
-	struct omap_group *group;
-	bool copied = false;
-	int ret;
-
-	map = kmalloc(sizeof(struct scoutfs_open_ino_map), GFP_NOFS);
-	if (!map)
-		return -ENOMEM;
-
-	map->args = *args;
-
-	rcu_read_lock();
-	group = rhashtable_lookup(&ominf->group_ht, &group_nr, group_ht_params);
-	if (group) {
-		spin_lock(&group->lock);
-		trace_group(sb, request, group, -1);
-		if (group->total > 0 && group->total < UINT_MAX) {
-			memcpy(map->bits, group->bits, sizeof(map->bits));
-			copied = true;
-		}
-		spin_unlock(&group->lock);
-	}
-	rcu_read_unlock();
-
-	if (!copied)
-		memset(map->bits, 0, sizeof(map->bits));
-
-	ret = scoutfs_client_send_omap_response(sb, id, map);
-	kfree(map);
-	return ret;
-}
-
-/*
- * The server has received an open ino map response from a client.  Find
- * the original request that it's serving, or in the response's map, and
- * send a reply if this was the last response from a client we were
- * waiting for.
- *
- * We can get responses for requests we're no longer tracking if, for
- * example, sending to a client gets an error.  We'll have already sent
- * the response to the requesting client so we drop these responses on
- * the floor.
- */
-int scoutfs_omap_server_handle_response(struct super_block *sb, u64 rid,
-					struct scoutfs_open_ino_map *resp_map)
-{
-	DECLARE_OMAP_INFO(sb, ominf);
-	struct scoutfs_open_ino_map *map;
-	struct omap_rid_entry *entry;
-	bool send_response = false;
-	struct omap_request *req;
-	u64 resp_rid;
-	u64 resp_id;
-	int ret;
-
-	map = kmalloc(sizeof(struct scoutfs_open_ino_map), GFP_NOFS);
-	if (!map) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	rcu_read_lock();
-	req = rhashtable_lookup(&ominf->req_ht, &resp_map->args.req_id, req_ht_params);
-	if (req) {
-		spin_lock(&req->lock);
-		entry = find_rid(&req->rids, rid);
-		if (entry) {
-			bitmap_or((unsigned long *)req->map.bits, (unsigned long *)req->map.bits,
-				  (unsigned long *)resp_map->bits, SCOUTFS_OPEN_INO_MAP_BITS);
-			if (free_rid(&req->rids, entry) == 0)
-				send_response = true;
-		}
-		spin_unlock(&req->lock);
-
-		if (send_response) {
-			resp_rid = req->client_rid;
-			resp_id = req->client_id;
-			memcpy(map, &req->map, sizeof(struct scoutfs_open_ino_map));
-			rhashtable_remove_fast(&ominf->req_ht, &req->ht_head, req_ht_params);
-			call_rcu(&req->rcu, free_req_rcu);
-		}
-	}
-	rcu_read_unlock();
-
-	if (send_response)
-		ret = scoutfs_server_send_omap_response(sb, resp_rid, resp_id, map, 0);
-	else
-		ret = 0;
-	kfree(map);
-out:
-	return ret;
-}
-
-/*
- * The server is shutting down.  Free all the server state associated
- * with ongoing request processing.  Clients who still have requests
- * pending will resend them to the next server.
- */
-void scoutfs_omap_server_shutdown(struct super_block *sb)
-{
-	DECLARE_OMAP_INFO(sb, ominf);
-	struct rhashtable_iter iter;
-	struct llist_node *requests;
-	struct omap_request *req;
-	struct omap_request *tmp;
-
-	rhashtable_walk_enter(&ominf->req_ht, &iter);
-	rhashtable_walk_start(&iter);
-
-	for (;;) {
-		req = rhashtable_walk_next(&iter);
-		if (req == NULL)
-			break;
-		if (req == ERR_PTR(-EAGAIN))
-			continue;
-
-		if (req->rids.nr_rids != 0) {
-			free_rids(&req->rids);
-			rhashtable_remove_fast(&ominf->req_ht, &req->ht_head, req_ht_params);
-			call_rcu(&req->rcu, free_req_rcu);
-		}
-	}
-
-	rhashtable_walk_stop(&iter);
-	rhashtable_walk_exit(&iter);
-
-	requests = llist_del_all(&ominf->requests);
-	llist_for_each_entry_safe(req, tmp, requests, llnode)
-		kfree(req);
-
-	spin_lock(&ominf->lock);
-	free_rid_list(&ominf->rids);
-	spin_unlock(&ominf->lock);
-
-	synchronize_rcu();
-}
-
-int scoutfs_omap_setup(struct super_block *sb)
-{
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-	struct omap_info *ominf;
-	int ret;
-
-	ominf = kzalloc(sizeof(struct omap_info), GFP_KERNEL);
-	if (!ominf) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	ret = rhashtable_init(&ominf->group_ht, &group_ht_params);
-	if (ret < 0) {
-		kfree(ominf);
-		goto out;
-	}
-
-	ret = rhashtable_init(&ominf->req_ht, &req_ht_params);
-	if (ret < 0) {
-		rhashtable_destroy(&ominf->group_ht);
-		kfree(ominf);
-		goto out;
-	}
-
-	init_llist_head(&ominf->requests);
-	spin_lock_init(&ominf->lock);
-	init_rid_list(&ominf->rids);
-	atomic64_set(&ominf->next_req_id, 0);
-
-	sbi->omap_info = ominf;
-	ret = 0;
-out:
-	return ret;
-}
-
-/*
- * To get here the server must have shut down, freeing requests, and
- * evict must have been called on all cached inodes so we can just
- * synchronize all the pending group frees.
- */
-void scoutfs_omap_destroy(struct super_block *sb)
-{
-	DECLARE_OMAP_INFO(sb, ominf);
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-	struct rhashtable_iter iter;
-
-	if (ominf) {
-		synchronize_rcu();
-
-		/* double check that all the groups deced to 0 and were freed */
-		rhashtable_walk_enter(&ominf->group_ht, &iter);
-		rhashtable_walk_start(&iter);
-		WARN_ON_ONCE(rhashtable_walk_peek(&iter) != NULL);
-		rhashtable_walk_stop(&iter);
-		rhashtable_walk_exit(&iter);
-
-		spin_lock(&ominf->lock);
-		free_rid_list(&ominf->rids);
-		spin_unlock(&ominf->lock);
-
-		rhashtable_destroy(&ominf->group_ht);
-		rhashtable_destroy(&ominf->req_ht);
-		kfree(ominf);
-		sbi->omap_info = NULL;
-	}
-}

kmod/src/omap.h

@@ -1,23 +0,0 @@
-#ifndef _SCOUTFS_OMAP_H_
-#define _SCOUTFS_OMAP_H_
-
-int scoutfs_omap_set(struct super_block *sb, u64 ino);
-bool scoutfs_omap_test(struct super_block *sb, u64 ino);
-void scoutfs_omap_clear(struct super_block *sb, u64 ino);
-int scoutfs_omap_client_handle_request(struct super_block *sb, u64 id,
-				       struct scoutfs_open_ino_map_args *args);
-void scoutfs_omap_calc_group_nrs(u64 ino, u64 *group_nr, int *bit_nr);
-
-int scoutfs_omap_add_rid(struct super_block *sb, u64 rid);
-int scoutfs_omap_remove_rid(struct super_block *sb, u64 rid);
-int scoutfs_omap_finished_recovery(struct super_block *sb);
-int scoutfs_omap_server_handle_request(struct super_block *sb, u64 rid, u64 id,
-				       struct scoutfs_open_ino_map_args *args);
-int scoutfs_omap_server_handle_response(struct super_block *sb, u64 rid,
-					struct scoutfs_open_ino_map *resp_map);
-void scoutfs_omap_server_shutdown(struct super_block *sb);
-
-int scoutfs_omap_setup(struct super_block *sb);
-void scoutfs_omap_destroy(struct super_block *sb);
-
-#endif

kmod/src/options.c

@@ -26,41 +26,22 @@
 #include "msg.h"
 #include "options.h"
 #include "super.h"
-#include "inode.h"
-#include "alloc.h"
-
-enum {
-	Opt_acl,
-	Opt_data_prealloc_blocks,
-	Opt_data_prealloc_contig_only,
-	Opt_metadev_path,
-	Opt_noacl,
-	Opt_orphan_scan_delay_ms,
-	Opt_quorum_heartbeat_timeout_ms,
-	Opt_quorum_slot_nr,
-	Opt_err,
-};
 
 static const match_table_t tokens = {
-	{Opt_acl, "acl"},
-	{Opt_data_prealloc_blocks, "data_prealloc_blocks=%s"},
-	{Opt_data_prealloc_contig_only, "data_prealloc_contig_only=%s"},
-	{Opt_metadev_path, "metadev_path=%s"},
-	{Opt_noacl, "noacl"},
-	{Opt_orphan_scan_delay_ms, "orphan_scan_delay_ms=%s"},
-	{Opt_quorum_heartbeat_timeout_ms, "quorum_heartbeat_timeout_ms=%s"},
 	{Opt_quorum_slot_nr, "quorum_slot_nr=%s"},
+	{Opt_metadev_path, "metadev_path=%s"},
 	{Opt_err, NULL}
 };
 
-struct options_info {
-	seqlock_t seqlock;
-	struct scoutfs_mount_options opts;
-	struct scoutfs_sysfs_attrs sysfs_attrs;
+struct options_sb_info {
+	struct dentry *debugfs_dir;
 };
 
-#define DECLARE_OPTIONS_INFO(sb, name) \
-	struct options_info *name = SCOUTFS_SB(sb)->options_info
+u32 scoutfs_option_u32(struct super_block *sb, int token)
+{
+	WARN_ON_ONCE(1);
+	return 0;
+}
 
 static int parse_bdev_path(struct super_block *sb, substring_t *substr,
 			      char **bdev_path_ret)
@@ -108,157 +89,58 @@ out:
 	return ret;
 }
 
-static void free_options(struct scoutfs_mount_options *opts)
-{
-	kfree(opts->metadev_path);
-}
-
-#define MIN_ORPHAN_SCAN_DELAY_MS	100UL
-#define DEFAULT_ORPHAN_SCAN_DELAY_MS	(10 * MSEC_PER_SEC)
-#define MAX_ORPHAN_SCAN_DELAY_MS	(60 * MSEC_PER_SEC)
-
-#define MIN_DATA_PREALLOC_BLOCKS	1ULL
-#define MAX_DATA_PREALLOC_BLOCKS	((unsigned long long)SCOUTFS_BLOCK_SM_MAX)
-
-static void init_default_options(struct scoutfs_mount_options *opts)
-{
-	memset(opts, 0, sizeof(*opts));
-
-	opts->data_prealloc_blocks = SCOUTFS_DATA_PREALLOC_DEFAULT_BLOCKS;
-	opts->data_prealloc_contig_only = 1;
-	opts->orphan_scan_delay_ms = -1;
-	opts->quorum_heartbeat_timeout_ms = SCOUTFS_QUORUM_DEF_HB_TIMEO_MS;
-	opts->quorum_slot_nr = -1;
-}
-
-static int verify_quorum_heartbeat_timeout_ms(struct super_block *sb, int ret, u64 val)
-{
-	if (ret < 0) {
-		scoutfs_err(sb, "failed to parse quorum_heartbeat_timeout_ms value");
-		return -EINVAL;
-	}
-	if (val < SCOUTFS_QUORUM_MIN_HB_TIMEO_MS || val > SCOUTFS_QUORUM_MAX_HB_TIMEO_MS) {
-		scoutfs_err(sb, "invalid quorum_heartbeat_timeout_ms value %llu, must be between %lu and %lu",
-			    val, SCOUTFS_QUORUM_MIN_HB_TIMEO_MS, SCOUTFS_QUORUM_MAX_HB_TIMEO_MS);
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-/*
- * Parse the option string into our options struct.   This can allocate
- * memory in the struct.  The caller is responsible for always calling
- * free_options() when the struct is destroyed, including when we return
- * an error.
- */
-static int parse_options(struct super_block *sb, char *options, struct scoutfs_mount_options *opts)
+int scoutfs_parse_options(struct super_block *sb, char *options,
+			  struct mount_options *parsed)
 {
 	substring_t args[MAX_OPT_ARGS];
-	u64 nr64;
 	int nr;
 	int token;
 	char *p;
 	int ret;
 
+	/* Set defaults */
+	memset(parsed, 0, sizeof(*parsed));
+	parsed->quorum_slot_nr = -1;
+
 	while ((p = strsep(&options, ",")) != NULL) {
 		if (!*p)
 			continue;
 
 		token = match_token(p, tokens, args);
 		switch (token) {
-
-		case Opt_acl:
-			sb->s_flags |= SB_POSIXACL;
-			break;
-
-		case Opt_data_prealloc_blocks:
-			ret = match_u64(args, &nr64);
-			if (ret < 0 ||
-			    nr64 < MIN_DATA_PREALLOC_BLOCKS || nr64 > MAX_DATA_PREALLOC_BLOCKS) {
-				scoutfs_err(sb, "invalid data_prealloc_blocks option, must be between %llu and %llu",
-					    MIN_DATA_PREALLOC_BLOCKS, MAX_DATA_PREALLOC_BLOCKS);
-				if (ret == 0)
-					ret = -EINVAL;
-				return ret;
-			}
-			opts->data_prealloc_blocks = nr64;
-			break;
-
-		case Opt_data_prealloc_contig_only:
-			ret = match_int(args, &nr);
-			if (ret < 0 || nr < 0 || nr > 1) {
-				scoutfs_err(sb, "invalid data_prealloc_contig_only option, bool must only be 0 or 1");
-				if (ret == 0)
-					ret = -EINVAL;
-				return ret;
-			}
-			opts->data_prealloc_contig_only = nr;
-			break;
-
-		case Opt_metadev_path:
-			ret = parse_bdev_path(sb, &args[0], &opts->metadev_path);
-			if (ret < 0)
-				return ret;
-			break;
-
-		case Opt_noacl:
-			sb->s_flags &= ~SB_POSIXACL;
-			break;
-
-		case Opt_orphan_scan_delay_ms:
-			if (opts->orphan_scan_delay_ms != -1) {
-				scoutfs_err(sb, "multiple orphan_scan_delay_ms options provided, only provide one.");
-				return -EINVAL;
-			}
-
-			ret = match_int(args, &nr);
-			if (ret < 0 ||
-			    nr < MIN_ORPHAN_SCAN_DELAY_MS || nr > MAX_ORPHAN_SCAN_DELAY_MS) {
-				scoutfs_err(sb, "invalid orphan_scan_delay_ms option, must be between %lu and %lu",
-					    MIN_ORPHAN_SCAN_DELAY_MS, MAX_ORPHAN_SCAN_DELAY_MS);
-				if (ret == 0)
-					ret = -EINVAL;
-				return ret;
-			}
-			opts->orphan_scan_delay_ms = nr;
-			break;
-
-		case Opt_quorum_heartbeat_timeout_ms:
-			ret = match_u64(args, &nr64);
-			ret = verify_quorum_heartbeat_timeout_ms(sb, ret, nr64);
-			if (ret < 0)
-				return ret;
-			opts->quorum_heartbeat_timeout_ms = nr64;
-			break;
-
 		case Opt_quorum_slot_nr:
-			if (opts->quorum_slot_nr != -1) {
+
+			if (parsed->quorum_slot_nr != -1) {
 				scoutfs_err(sb, "multiple quorum_slot_nr options provided, only provide one.");
 				return -EINVAL;
 			}
 
 			ret = match_int(args, &nr);
-			if (ret < 0 || nr < 0 || nr >= SCOUTFS_QUORUM_MAX_SLOTS) {
+			if (ret < 0 || nr < 0 ||
+			    nr >= SCOUTFS_QUORUM_MAX_SLOTS) {
 				scoutfs_err(sb, "invalid quorum_slot_nr option, must be between 0 and %u",
 					    SCOUTFS_QUORUM_MAX_SLOTS - 1);
 				if (ret == 0)
 					ret = -EINVAL;
 				return ret;
 			}
-			opts->quorum_slot_nr = nr;
+			parsed->quorum_slot_nr = nr;
 			break;
+		case Opt_metadev_path:
 
+			ret = parse_bdev_path(sb, &args[0],
+						 &parsed->metadev_path);
+			if (ret < 0)
+				return ret;
+			break;
 		default:
-			scoutfs_err(sb, "Unknown or malformed option, \"%s\"", p);
-			return -EINVAL;
+			scoutfs_err(sb, "Unknown or malformed option, \"%s\"",
+				    p);
+			break;
 		}
 	}
 
-	if (opts->orphan_scan_delay_ms == -1)
-		opts->orphan_scan_delay_ms = DEFAULT_ORPHAN_SCAN_DELAY_MS;
-
-	if (!opts->metadev_path) {
+	if (!parsed->metadev_path) {
 		scoutfs_err(sb, "Required mount option \"metadev_path\" not found");
 		return -EINVAL;
 	}
@@ -266,305 +148,40 @@ static int parse_options(struct super_block *sb, char *options, struct scoutfs_m
 	return 0;
 }
 
-void scoutfs_options_read(struct super_block *sb, struct scoutfs_mount_options *opts)
-{
-	DECLARE_OPTIONS_INFO(sb, optinf);
-	unsigned int seq;
-
-	if (WARN_ON_ONCE(optinf == NULL)) {
-		/* trying to use options before early setup or after destroy */
-		init_default_options(opts);
-		return;
-	}
-
-	do {
-		seq = read_seqbegin(&optinf->seqlock);
-		memcpy(opts, &optinf->opts, sizeof(struct scoutfs_mount_options));
-	} while (read_seqretry(&optinf->seqlock, seq));
-}
-
-/*
- * Early setup that parses and stores the options so that the rest of
- * setup can use them.   Full options setup that relies on other
- * components will be done later.
- */
-int scoutfs_options_early_setup(struct super_block *sb, char *options)
+int scoutfs_options_setup(struct super_block *sb)
 {
 	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-	struct scoutfs_mount_options opts;
-	struct options_info *optinf;
+	struct options_sb_info *osi;
 	int ret;
 
-	init_default_options(&opts);
+	osi = kzalloc(sizeof(struct options_sb_info), GFP_KERNEL);
+	if (!osi)
+		return -ENOMEM;
 
-	ret = parse_options(sb, options, &opts);
-	if (ret < 0)
-		goto out;
+	sbi->options = osi;
 
-	optinf = kzalloc(sizeof(struct options_info), GFP_KERNEL);
-	if (!optinf) {
+	osi->debugfs_dir = debugfs_create_dir("options", sbi->debug_root);
+	if (!osi->debugfs_dir) {
 		ret = -ENOMEM;
 		goto out;
 	}
 
-	seqlock_init(&optinf->seqlock);
-	scoutfs_sysfs_init_attrs(sb, &optinf->sysfs_attrs);
-
-	write_seqlock(&optinf->seqlock);
-	optinf->opts = opts;
-	write_sequnlock(&optinf->seqlock);
-
-	sbi->options_info = optinf;
 	ret = 0;
 out:
-	if (ret < 0)
-		free_options(&opts);
-
-	return ret;
-}
-
-int scoutfs_options_show(struct seq_file *seq, struct dentry *root)
-{
-	struct super_block *sb = root->d_sb;
-	struct scoutfs_mount_options opts;
-	const bool is_acl = !!(sb->s_flags & SB_POSIXACL);
-
-	scoutfs_options_read(sb, &opts);
-
-	if (is_acl)
-		seq_puts(seq, ",acl");
-	seq_printf(seq, ",data_prealloc_blocks=%llu", opts.data_prealloc_blocks);
-	seq_printf(seq, ",data_prealloc_contig_only=%u", opts.data_prealloc_contig_only);
-	seq_printf(seq, ",metadev_path=%s", opts.metadev_path);
-	if (!is_acl)
-		seq_puts(seq, ",noacl");
-	seq_printf(seq, ",orphan_scan_delay_ms=%u", opts.orphan_scan_delay_ms);
-	if (opts.quorum_slot_nr >= 0)
-		seq_printf(seq, ",quorum_slot_nr=%d", opts.quorum_slot_nr);
-
-	return 0;
-}
-
-static ssize_t data_prealloc_blocks_show(struct kobject *kobj, struct kobj_attribute *attr,
-					 char *buf)
-{
-	struct super_block *sb = SCOUTFS_SYSFS_ATTRS_SB(kobj);
-	struct scoutfs_mount_options opts;
-
-	scoutfs_options_read(sb, &opts);
-
-	return snprintf(buf, PAGE_SIZE, "%llu", opts.data_prealloc_blocks);
-}
-static ssize_t data_prealloc_blocks_store(struct kobject *kobj, struct kobj_attribute *attr,
-					  const char *buf, size_t count)
-{
-	struct super_block *sb = SCOUTFS_SYSFS_ATTRS_SB(kobj);
-	DECLARE_OPTIONS_INFO(sb, optinf);
-	char nullterm[30]; /* more than enough for octal -U64_MAX */
-	u64 val;
-	int len;
-	int ret;
-
-	len = min(count, sizeof(nullterm) - 1);
-	memcpy(nullterm, buf, len);
-	nullterm[len] = '\0';
-
-	ret = kstrtoll(nullterm, 0, &val);
-	if (ret < 0 || val < MIN_DATA_PREALLOC_BLOCKS || val > MAX_DATA_PREALLOC_BLOCKS) {
-		scoutfs_err(sb, "invalid data_prealloc_blocks option, must be between %llu and %llu",
-			    MIN_DATA_PREALLOC_BLOCKS, MAX_DATA_PREALLOC_BLOCKS);
-		return -EINVAL;
-	}
-
-	write_seqlock(&optinf->seqlock);
-	optinf->opts.data_prealloc_blocks = val;
-	write_sequnlock(&optinf->seqlock);
-
-	return count;
-}
-SCOUTFS_ATTR_RW(data_prealloc_blocks);
-
-static ssize_t data_prealloc_contig_only_show(struct kobject *kobj, struct kobj_attribute *attr,
-					 char *buf)
-{
-	struct super_block *sb = SCOUTFS_SYSFS_ATTRS_SB(kobj);
-	struct scoutfs_mount_options opts;
-
-	scoutfs_options_read(sb, &opts);
-
-	return snprintf(buf, PAGE_SIZE, "%u", opts.data_prealloc_contig_only);
-}
-static ssize_t data_prealloc_contig_only_store(struct kobject *kobj, struct kobj_attribute *attr,
-					  const char *buf, size_t count)
-{
-	struct super_block *sb = SCOUTFS_SYSFS_ATTRS_SB(kobj);
-	DECLARE_OPTIONS_INFO(sb, optinf);
-	char nullterm[20]; /* more than enough for octal -U32_MAX */
-	long val;
-	int len;
-	int ret;
-
-	len = min(count, sizeof(nullterm) - 1);
-	memcpy(nullterm, buf, len);
-	nullterm[len] = '\0';
-
-	ret = kstrtol(nullterm, 0, &val);
-	if (ret < 0 || val < 0 || val > 1) {
-		scoutfs_err(sb, "invalid data_prealloc_contig_only option, bool must be 0 or 1");
-		return -EINVAL;
-	}
-
-	write_seqlock(&optinf->seqlock);
-	optinf->opts.data_prealloc_contig_only = val;
-	write_sequnlock(&optinf->seqlock);
-
-	return count;
-}
-SCOUTFS_ATTR_RW(data_prealloc_contig_only);
-
-static ssize_t metadev_path_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
-{
-	struct super_block *sb = SCOUTFS_SYSFS_ATTRS_SB(kobj);
-	struct scoutfs_mount_options opts;
-
-	scoutfs_options_read(sb, &opts);
-
-	return snprintf(buf, PAGE_SIZE, "%s", opts.metadev_path);
-}
-SCOUTFS_ATTR_RO(metadev_path);
-
-static ssize_t orphan_scan_delay_ms_show(struct kobject *kobj, struct kobj_attribute *attr,
-					 char *buf)
-{
-	struct super_block *sb = SCOUTFS_SYSFS_ATTRS_SB(kobj);
-	struct scoutfs_mount_options opts;
-
-	scoutfs_options_read(sb, &opts);
-
-	return snprintf(buf, PAGE_SIZE, "%u", opts.orphan_scan_delay_ms);
-}
-static ssize_t orphan_scan_delay_ms_store(struct kobject *kobj, struct kobj_attribute *attr,
-					  const char *buf, size_t count)
-{
-	struct super_block *sb = SCOUTFS_SYSFS_ATTRS_SB(kobj);
-	DECLARE_OPTIONS_INFO(sb, optinf);
-	char nullterm[20]; /* more than enough for octal -U32_MAX */
-	long val;
-	int len;
-	int ret;
-
-	len = min(count, sizeof(nullterm) - 1);
-	memcpy(nullterm, buf, len);
-	nullterm[len] = '\0';
-
-	ret = kstrtol(nullterm, 0, &val);
-	if (ret < 0 || val < MIN_ORPHAN_SCAN_DELAY_MS || val > MAX_ORPHAN_SCAN_DELAY_MS) {
-		scoutfs_err(sb, "invalid orphan_scan_delay_ms value written to options sysfs file, must be between %lu and %lu",
-			    MIN_ORPHAN_SCAN_DELAY_MS, MAX_ORPHAN_SCAN_DELAY_MS);
-		return -EINVAL;
-	}
-
-	write_seqlock(&optinf->seqlock);
-	optinf->opts.orphan_scan_delay_ms = val;
-	write_sequnlock(&optinf->seqlock);
-
-	scoutfs_inode_schedule_orphan_dwork(sb);
-
-	return count;
-}
-SCOUTFS_ATTR_RW(orphan_scan_delay_ms);
-
-static ssize_t quorum_heartbeat_timeout_ms_show(struct kobject *kobj, struct kobj_attribute *attr,
-						char *buf)
-{
-	struct super_block *sb = SCOUTFS_SYSFS_ATTRS_SB(kobj);
-	struct scoutfs_mount_options opts;
-
-	scoutfs_options_read(sb, &opts);
-
-	return snprintf(buf, PAGE_SIZE, "%llu", opts.quorum_heartbeat_timeout_ms);
-}
-static ssize_t quorum_heartbeat_timeout_ms_store(struct kobject *kobj, struct kobj_attribute *attr,
-						 const char *buf, size_t count)
-{
-	struct super_block *sb = SCOUTFS_SYSFS_ATTRS_SB(kobj);
-	DECLARE_OPTIONS_INFO(sb, optinf);
-	char nullterm[30]; /* more than enough for octal -U64_MAX */
-	u64 val;
-	int len;
-	int ret;
-
-	len = min(count, sizeof(nullterm) - 1);
-	memcpy(nullterm, buf, len);
-	nullterm[len] = '\0';
-
-	ret = kstrtoll(nullterm, 0, &val);
-	ret = verify_quorum_heartbeat_timeout_ms(sb, ret, val);
-	if (ret == 0) {
-		write_seqlock(&optinf->seqlock);
-		optinf->opts.quorum_heartbeat_timeout_ms = val;
-		write_sequnlock(&optinf->seqlock);
-		ret = count;
-	}
-
-	return ret;
-}
-SCOUTFS_ATTR_RW(quorum_heartbeat_timeout_ms);
-
-static ssize_t quorum_slot_nr_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
-{
-	struct super_block *sb = SCOUTFS_SYSFS_ATTRS_SB(kobj);
-	struct scoutfs_mount_options opts;
-
-	scoutfs_options_read(sb, &opts);
-
-	return snprintf(buf, PAGE_SIZE, "%d\n", opts.quorum_slot_nr);
-}
-SCOUTFS_ATTR_RO(quorum_slot_nr);
-
-static struct attribute *options_attrs[] = {
-	SCOUTFS_ATTR_PTR(data_prealloc_blocks),
-	SCOUTFS_ATTR_PTR(data_prealloc_contig_only),
-	SCOUTFS_ATTR_PTR(metadev_path),
-	SCOUTFS_ATTR_PTR(orphan_scan_delay_ms),
-	SCOUTFS_ATTR_PTR(quorum_heartbeat_timeout_ms),
-	SCOUTFS_ATTR_PTR(quorum_slot_nr),
-	NULL,
-};
-
-int scoutfs_options_setup(struct super_block *sb)
-{
-	DECLARE_OPTIONS_INFO(sb, optinf);
-	int ret;
-
-	ret = scoutfs_sysfs_create_attrs(sb, &optinf->sysfs_attrs, options_attrs, "mount_options");
-	if (ret < 0)
+	if (ret)
 		scoutfs_options_destroy(sb);
 	return ret;
 }
 
-/*
- * We remove the sysfs files early in unmount so that they can't try to call other subsystems
- * as they're being destroyed.
- */
-void scoutfs_options_stop(struct super_block *sb)
-{
-	DECLARE_OPTIONS_INFO(sb, optinf);
-
-	if (optinf)
-		scoutfs_sysfs_destroy_attrs(sb, &optinf->sysfs_attrs);
-}
-
 void scoutfs_options_destroy(struct super_block *sb)
 {
 	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-	DECLARE_OPTIONS_INFO(sb, optinf);
+	struct options_sb_info *osi = sbi->options;
 
-	scoutfs_options_stop(sb);
-
-	if (optinf) {
-		free_options(&optinf->opts);
-		kfree(optinf);
-		sbi->options_info = NULL;
+	if (osi) {
+		if (osi->debugfs_dir)
+			debugfs_remove_recursive(osi->debugfs_dir);
+		kfree(osi);
+		sbi->options = NULL;
 	}
 }

kmod/src/options.h

@@ -5,21 +5,23 @@
 #include <linux/in.h>
 #include "format.h"
 
-struct scoutfs_mount_options {
-	u64 data_prealloc_blocks;
-	bool data_prealloc_contig_only;
-	char *metadev_path;
-	unsigned int orphan_scan_delay_ms;
-	int quorum_slot_nr;
-	u64 quorum_heartbeat_timeout_ms;
+enum scoutfs_mount_options {
+	Opt_quorum_slot_nr,
+	Opt_metadev_path,
+	Opt_err,
 };
 
-void scoutfs_options_read(struct super_block *sb, struct scoutfs_mount_options *opts);
-int scoutfs_options_show(struct seq_file *seq, struct dentry *root);
+struct mount_options {
+	int quorum_slot_nr;
+	char *metadev_path;
+};
 
-int scoutfs_options_early_setup(struct super_block *sb, char *options);
+int scoutfs_parse_options(struct super_block *sb, char *options,
+			  struct mount_options *parsed);
 int scoutfs_options_setup(struct super_block *sb);
-void scoutfs_options_stop(struct super_block *sb);
 void scoutfs_options_destroy(struct super_block *sb);
 
+u32 scoutfs_option_u32(struct super_block *sb, int token);
+#define scoutfs_option_bool scoutfs_option_u32
+
 #endif	/* _SCOUTFS_OPTIONS_H_ */

kmod/src/quorum.h

@@ -2,14 +2,12 @@
 #define _SCOUTFS_QUORUM_H_
 
 int scoutfs_quorum_server_sin(struct super_block *sb, struct sockaddr_in *sin);
+void scoutfs_quorum_server_shutdown(struct super_block *sb);
 
 u8 scoutfs_quorum_votes_needed(struct super_block *sb);
-void scoutfs_quorum_slot_sin(struct scoutfs_quorum_config *qconf, int i,
+void scoutfs_quorum_slot_sin(struct scoutfs_super_block *super, int i,
 			     struct sockaddr_in *sin);
 
-int scoutfs_quorum_fence_leaders(struct super_block *sb, struct scoutfs_quorum_config *qconf,
-				 u64 term);
-
 int scoutfs_quorum_setup(struct super_block *sb);
 void scoutfs_quorum_shutdown(struct super_block *sb);
 void scoutfs_quorum_destroy(struct super_block *sb);

kmod/src/recov.c

@@ -1,305 +0,0 @@
-/*
- * Copyright (C) 2021 Versity Software, Inc.  All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License v2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- */
-#include <linux/kernel.h>
-#include <linux/fs.h>
-#include <linux/slab.h>
-#include <linux/sched.h>
-#include <linux/rhashtable.h>
-#include <linux/rcupdate.h>
-#include <linux/list_sort.h>
-
-#include "super.h"
-#include "recov.h"
-#include "cmp.h"
-
-/*
- * There are a few server messages which can't be processed until they
- * know that they have state for all possibly active clients.  These
- * little helpers track which clients have recovered what state and give
- * those message handlers a call to check if recovery has completed.  We
- * track the timeout here, but all we do is call back into the server to
- * take steps to evict timed out clients and then let us know that their
- * recovery has finished.
- */
-
-struct recov_info {
-	struct super_block *sb;
-	spinlock_t lock;
-	struct list_head pending;
-	struct timer_list timer;
-	void (*timeout_fn)(struct super_block *);
-};
-
-#define DECLARE_RECOV_INFO(sb, name) \
-	struct recov_info *name = SCOUTFS_SB(sb)->recov_info
-
-struct recov_pending {
-	struct list_head head;
-	u64 rid;
-	int which;
-};
-
-static struct recov_pending *next_pending(struct recov_info *recinf, u64 rid, int which)
-{
-	struct recov_pending *pend;
-
-	list_for_each_entry(pend, &recinf->pending, head) {
-		if (pend->rid > rid && pend->which & which)
-			return pend;
-	}
-
-	return NULL;
-}
-
-static struct recov_pending *lookup_pending(struct recov_info *recinf, u64 rid, int which)
-{
-	struct recov_pending *pend;
-
-	pend = next_pending(recinf, rid - 1, which);
-	if (pend && pend->rid == rid)
-		return pend;
-
-	return NULL;
-}
-
-/*
- * We keep the pending list sorted by rid so that we can iterate over
- * them.  The list should be small and shouldn't be used often.
- */
-static int cmp_pending_rid(void *priv, struct list_head *A, struct list_head *B)
-{
-	struct recov_pending *a = list_entry(A, struct recov_pending, head);
-	struct recov_pending *b = list_entry(B, struct recov_pending, head);
-
-	return scoutfs_cmp_u64s(a->rid, b->rid);
-}
-
-/*
- * Record that we'll be waiting for a client to recover something.
- * _finished will eventually be called for every _prepare, either
- * because recovery naturally finished or because it timed out and the
- * server evicted the client. 
- */
-int scoutfs_recov_prepare(struct super_block *sb, u64 rid, int which)
-{
-	DECLARE_RECOV_INFO(sb, recinf);
-	struct recov_pending *alloc;
-	struct recov_pending *pend;
-
-	if (WARN_ON_ONCE(which & SCOUTFS_RECOV_INVALID))
-		return -EINVAL;
-
-	alloc = kmalloc(sizeof(*pend), GFP_NOFS);
-	if (!alloc)
-		return -ENOMEM;
-
-	spin_lock(&recinf->lock);
-
-	pend = lookup_pending(recinf, rid, SCOUTFS_RECOV_ALL);
-	if (pend) {
-		pend->which |= which;
-	} else {
-		swap(pend, alloc);
-		pend->rid = rid;
-		pend->which = which;
-		list_add_tail(&pend->head, &recinf->pending);
-		list_sort(NULL, &recinf->pending, cmp_pending_rid);
-	}
-
-	spin_unlock(&recinf->lock);
-
-	kfree(alloc);
-	return 0;
-}
-
-/*
- * Recovery is only finished once we've begun (which sets the timer) and
- * all clients have finished.  If we didn't test the timer we could
- * claim it finished prematurely as clients are being prepared.
- */
-static int recov_finished(struct recov_info *recinf)
-{
-	return !!(recinf->timeout_fn != NULL && list_empty(&recinf->pending));
-}
-
-static void timer_callback(struct timer_list *timer)
-{
-	struct recov_info *recinf = from_timer(recinf, timer, timer);
-
-	recinf->timeout_fn(recinf->sb);
-}
-
-/*
- * Begin waiting for recovery once we've prepared all the clients.  If
- * the timeout period elapses before _finish is called on all prepared
- * clients then the timer will call the callback.
- *
- * Returns > 0 if all the prepared clients finish recovery before begin
- * is called.
- */
-int scoutfs_recov_begin(struct super_block *sb, void (*timeout_fn)(struct super_block *),
-			unsigned int timeout_ms)
-{
-	DECLARE_RECOV_INFO(sb, recinf);
-	int ret;
-
-	spin_lock(&recinf->lock);
-
-	recinf->timeout_fn = timeout_fn;
-	recinf->timer.expires = jiffies + msecs_to_jiffies(timeout_ms);
-	add_timer(&recinf->timer);
-
-	ret = recov_finished(recinf);
-
-	spin_unlock(&recinf->lock);
-
-	if (ret > 0)
-		del_timer_sync(&recinf->timer);
-
-	return ret;
-}
-
-/*
- * A given client has recovered the given state.  If it's finished all
- * recovery then we free it, and if all clients have finished recovery
- * then we cancel the timeout timer.
- *
- * Returns > 0 if _begin has been called and all clients have finished.
- * The caller will only see > 0 returned once.
- */
-int scoutfs_recov_finish(struct super_block *sb, u64 rid, int which)
-{
-	DECLARE_RECOV_INFO(sb, recinf);
-	struct recov_pending *pend;
-	int ret = 0;
-
-	spin_lock(&recinf->lock);
-
-	pend = lookup_pending(recinf, rid, which);
-	if (pend) {
-		pend->which &= ~which;
-		if (pend->which) {
-			pend = NULL;
-		} else {
-			list_del(&pend->head);
-			ret = recov_finished(recinf);
-		}
-	}
-
-	spin_unlock(&recinf->lock);
-
-	if (ret > 0)
-		del_timer_sync(&recinf->timer);
-
-	kfree(pend);
-
-	return ret;
-}
-
-/*
- * Returns true if the given client is still trying to recover
- * the given state.
- */
-bool scoutfs_recov_is_pending(struct super_block *sb, u64 rid, int which)
-{
-	DECLARE_RECOV_INFO(sb, recinf);
-	bool is_pending;
-
-	spin_lock(&recinf->lock);
-	is_pending = lookup_pending(recinf, rid, which) != NULL;
-	spin_unlock(&recinf->lock);
-
-	return is_pending;
-}
-
-/*
- * Return the next rid after the given rid of a client waiting for the
- * given state to be recovered.  Start with rid 0, returns 0 when there
- * are no more clients waiting for recovery.
- *
- * This is inherently racey.  Callers are responsible for resolving any
- * actions taken based on pending with the recovery finishing, perhaps
- * before we return.
- */
-u64 scoutfs_recov_next_pending(struct super_block *sb, u64 rid, int which)
-{
-	DECLARE_RECOV_INFO(sb, recinf);
-	struct recov_pending *pend;
-
-	spin_lock(&recinf->lock);
-	pend = next_pending(recinf, rid, which);
-	rid = pend ? pend->rid : 0;
-	spin_unlock(&recinf->lock);
-
-	return rid;
-}
-
-/*
- * The server is shutting down and doesn't need to worry about recovery
- * anymore.  It'll be built up again by the next server, if needed.
- */
-void scoutfs_recov_shutdown(struct super_block *sb)
-{
-	DECLARE_RECOV_INFO(sb, recinf);
-	struct recov_pending *pend;
-	struct recov_pending *tmp;
-	LIST_HEAD(list);
-
-	del_timer_sync(&recinf->timer);
-
-	spin_lock(&recinf->lock);
-	list_splice_init(&recinf->pending, &list);
-	recinf->timeout_fn = NULL;
-	spin_unlock(&recinf->lock);
-
-	list_for_each_entry_safe(pend, tmp, &list, head) {
-		list_del(&pend->head);
-		kfree(pend);
-	}
-}
-
-int scoutfs_recov_setup(struct super_block *sb)
-{
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-	struct recov_info *recinf;
-	int ret;
-
-	recinf = kzalloc(sizeof(struct recov_info), GFP_KERNEL);
-	if (!recinf) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	recinf->sb = sb;
-	spin_lock_init(&recinf->lock);
-	INIT_LIST_HEAD(&recinf->pending);
-	timer_setup(&recinf->timer, timer_callback, 0);
-
-	sbi->recov_info = recinf;
-	ret = 0;
-out:
-	return ret;
-}
-
-void scoutfs_recov_destroy(struct super_block *sb)
-{
-	DECLARE_RECOV_INFO(sb, recinf);
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-
-	if (recinf) {
-		scoutfs_recov_shutdown(sb);
-
-		kfree(recinf);
-		sbi->recov_info = NULL;
-	}
-}

kmod/src/recov.h

@@ -1,23 +0,0 @@
-#ifndef _SCOUTFS_RECOV_H_
-#define _SCOUTFS_RECOV_H_
-
-enum {
-	SCOUTFS_RECOV_GREETING	= ( 1 <<  0),
-	SCOUTFS_RECOV_LOCKS	= ( 1 <<  1),
-
-	SCOUTFS_RECOV_INVALID	= (~0 <<  2),
-	SCOUTFS_RECOV_ALL	= (~SCOUTFS_RECOV_INVALID),
-};
-
-int scoutfs_recov_prepare(struct super_block *sb, u64 rid, int which);
-int scoutfs_recov_begin(struct super_block *sb, void (*timeout_fn)(struct super_block *),
-			unsigned int timeout_ms);
-int scoutfs_recov_finish(struct super_block *sb, u64 rid, int which);
-bool scoutfs_recov_is_pending(struct super_block *sb, u64 rid, int which);
-u64 scoutfs_recov_next_pending(struct super_block *sb, u64 rid, int which);
-void scoutfs_recov_shutdown(struct super_block *sb);
-
-int scoutfs_recov_setup(struct super_block *sb);
-void scoutfs_recov_destroy(struct super_block *sb);
-
-#endif

kmod/src/scoutfs_trace.h

@@ -58,6 +58,9 @@ struct lock_info;
 	__entry->pref##_map,			\
 	__entry->pref##_flags
 
+#define DECLARE_TRACED_EXTENT(name) \
+	struct scoutfs_traced_extent name = {0}
+
 DECLARE_EVENT_CLASS(scoutfs_ino_ret_class,
 	TP_PROTO(struct super_block *sb, u64 ino, int ret),
 
@@ -403,36 +406,32 @@ TRACE_EVENT(scoutfs_sync_fs,
 );
 
 TRACE_EVENT(scoutfs_trans_write_func,
-	TP_PROTO(struct super_block *sb, u64 dirty_block_bytes, u64 dirty_item_pages),
+	TP_PROTO(struct super_block *sb, unsigned long dirty),
 
-	TP_ARGS(sb, dirty_block_bytes, dirty_item_pages),
+	TP_ARGS(sb, dirty),
 
 	TP_STRUCT__entry(
 		SCSB_TRACE_FIELDS
-		__field(__u64, dirty_block_bytes)
-		__field(__u64, dirty_item_pages)
+		__field(unsigned long, dirty)
 	),
 
 	TP_fast_assign(
 		SCSB_TRACE_ASSIGN(sb);
-		__entry->dirty_block_bytes = dirty_block_bytes;
-		__entry->dirty_item_pages = dirty_item_pages;
+		__entry->dirty = dirty;
 	),
 
-	TP_printk(SCSBF" dirty_block_bytes %llu dirty_item_pages %llu",
-		  SCSB_TRACE_ARGS, __entry->dirty_block_bytes, __entry->dirty_item_pages)
+	TP_printk(SCSBF" dirty %lu", SCSB_TRACE_ARGS, __entry->dirty)
 );
 
 DECLARE_EVENT_CLASS(scoutfs_trans_hold_release_class,
-	TP_PROTO(struct super_block *sb, void *journal_info, int holders, int ret),
+	TP_PROTO(struct super_block *sb, void *journal_info, int holders),
 
-	TP_ARGS(sb, journal_info, holders, ret),
+	TP_ARGS(sb, journal_info, holders),
 
 	TP_STRUCT__entry(
 		SCSB_TRACE_FIELDS
 		__field(unsigned long, journal_info)
 		__field(int, holders)
-		__field(int, ret)
 	),
 
 	TP_fast_assign(
@@ -441,17 +440,17 @@ DECLARE_EVENT_CLASS(scoutfs_trans_hold_release_class,
 		__entry->holders = holders;
 	),
 
-	TP_printk(SCSBF" journal_info 0x%0lx holders %d ret %d",
-		  SCSB_TRACE_ARGS, __entry->journal_info, __entry->holders, __entry->ret)
+	TP_printk(SCSBF" journal_info 0x%0lx holders %d",
+		  SCSB_TRACE_ARGS, __entry->journal_info, __entry->holders)
 );
 
-DEFINE_EVENT(scoutfs_trans_hold_release_class, scoutfs_hold_trans,
-	TP_PROTO(struct super_block *sb, void *journal_info, int holders, int ret),
-	TP_ARGS(sb, journal_info, holders, ret)
+DEFINE_EVENT(scoutfs_trans_hold_release_class, scoutfs_trans_acquired_hold,
+	TP_PROTO(struct super_block *sb, void *journal_info, int holders),
+	TP_ARGS(sb, journal_info, holders)
 );
 DEFINE_EVENT(scoutfs_trans_hold_release_class, scoutfs_release_trans,
-	TP_PROTO(struct super_block *sb, void *journal_info, int holders, int ret),
-	TP_ARGS(sb, journal_info, holders, ret)
+	TP_PROTO(struct super_block *sb, void *journal_info, int holders),
+	TP_ARGS(sb, journal_info, holders)
 );
 
 TRACE_EVENT(scoutfs_ioc_release,
@@ -691,16 +690,15 @@ TRACE_EVENT(scoutfs_evict_inode,
 
 TRACE_EVENT(scoutfs_drop_inode,
 	TP_PROTO(struct super_block *sb, __u64 ino, unsigned int nlink,
-		 unsigned int unhashed, bool lock_covered),
+		 unsigned int unhashed),
 
-	TP_ARGS(sb, ino, nlink, unhashed, lock_covered),
+	TP_ARGS(sb, ino, nlink, unhashed),
 
 	TP_STRUCT__entry(
 		SCSB_TRACE_FIELDS
 		__field(__u64, ino)
 		__field(unsigned int, nlink)
 		__field(unsigned int, unhashed)
-		__field(unsigned int, lock_covered)
 	),
 
 	TP_fast_assign(
@@ -708,12 +706,10 @@ TRACE_EVENT(scoutfs_drop_inode,
 		__entry->ino = ino;
 		__entry->nlink = nlink;
 		__entry->unhashed = unhashed;
-		__entry->lock_covered = !!lock_covered;
 	),
 
-	TP_printk(SCSBF" ino %llu nlink %u unhashed %d lock_covered %u", SCSB_TRACE_ARGS,
-		  __entry->ino, __entry->nlink, __entry->unhashed,
-		  __entry->lock_covered)
+	TP_printk(SCSBF" ino %llu nlink %u unhashed %d", SCSB_TRACE_ARGS,
+		  __entry->ino, __entry->nlink, __entry->unhashed)
 );
 
 TRACE_EVENT(scoutfs_inode_walk_writeback,
@@ -817,17 +813,22 @@ TRACE_EVENT(scoutfs_advance_dirty_super,
 	TP_printk(SCSBF" super seq now %llu", SCSB_TRACE_ARGS, __entry->seq)
 );
 
-TRACE_EVENT(scoutfs_dir_add_next_linkref_found,
+TRACE_EVENT(scoutfs_dir_add_next_linkref,
 	TP_PROTO(struct super_block *sb, __u64 ino, __u64 dir_ino,
-		 __u64 dir_pos, unsigned int name_len),
+		 __u64 dir_pos, int ret, __u64 found_dir_ino,
+		 __u64 found_dir_pos, unsigned int name_len),
 
-	TP_ARGS(sb, ino, dir_ino, dir_pos, name_len),
+	TP_ARGS(sb, ino, dir_ino, dir_pos, ret, found_dir_pos, found_dir_ino,
+		name_len),
 
 	TP_STRUCT__entry(
 		SCSB_TRACE_FIELDS
 		__field(__u64, ino)
 		__field(__u64, dir_ino)
 		__field(__u64, dir_pos)
+		__field(int, ret)
+		__field(__u64, found_dir_ino)
+		__field(__u64, found_dir_pos)
 		__field(unsigned int, name_len)
 	),
 
@@ -836,43 +837,16 @@ TRACE_EVENT(scoutfs_dir_add_next_linkref_found,
 		__entry->ino = ino;
 		__entry->dir_ino = dir_ino;
 		__entry->dir_pos = dir_pos;
+		__entry->ret = ret;
+		__entry->found_dir_ino = dir_ino;
+		__entry->found_dir_pos = dir_pos;
 		__entry->name_len = name_len;
 	),
 
-	TP_printk(SCSBF" ino %llu dir_ino %llu dir_pos %llu name_len %u",
-		  SCSB_TRACE_ARGS, __entry->ino, __entry->dir_ino,
-		  __entry->dir_pos, __entry->name_len)
-);
-
-TRACE_EVENT(scoutfs_dir_add_next_linkrefs,
-	TP_PROTO(struct super_block *sb, __u64 ino, __u64 dir_ino,
-		 __u64 dir_pos, int count, int nr, int ret),
-
-	TP_ARGS(sb, ino, dir_ino, dir_pos, count, nr, ret),
-
-	TP_STRUCT__entry(
-		SCSB_TRACE_FIELDS
-		__field(__u64, ino)
-		__field(__u64, dir_ino)
-		__field(__u64, dir_pos)
-		__field(int, count)
-		__field(int, nr)
-		__field(int, ret)
-	),
-
-	TP_fast_assign(
-		SCSB_TRACE_ASSIGN(sb);
-		__entry->ino = ino;
-		__entry->dir_ino = dir_ino;
-		__entry->dir_pos = dir_pos;
-		__entry->count = count;
-		__entry->nr = nr;
-		__entry->ret = ret;
-	),
-
-	TP_printk(SCSBF" ino %llu dir_ino %llu dir_pos %llu count %d nr %d ret %d",
-		  SCSB_TRACE_ARGS, __entry->ino, __entry->dir_ino,
-		  __entry->dir_pos, __entry->count, __entry->nr, __entry->ret)
+	TP_printk(SCSBF" ino %llu dir_ino %llu dir_pos %llu ret %d found_dir_ino %llu found_dir_pos %llu name_len %u",
+		  SCSB_TRACE_ARGS, __entry->ino, __entry->dir_pos,
+		  __entry->dir_ino, __entry->ret, __entry->found_dir_pos,
+		  __entry->found_dir_ino, __entry->name_len)
 );
 
 TRACE_EVENT(scoutfs_write_begin,
@@ -1008,6 +982,22 @@ TRACE_EVENT(scoutfs_delete_inode,
 		  __entry->mode, __entry->size)
 );
 
+TRACE_EVENT(scoutfs_scan_orphans,
+	TP_PROTO(struct super_block *sb),
+
+	TP_ARGS(sb),
+
+	TP_STRUCT__entry(
+		__field(dev_t, dev)
+	),
+
+	TP_fast_assign(
+		__entry->dev = sb->s_dev;
+	),
+
+	TP_printk("dev %d,%d", MAJOR(__entry->dev), MINOR(__entry->dev))
+);
+
 DECLARE_EVENT_CLASS(scoutfs_key_class,
         TP_PROTO(struct super_block *sb, struct scoutfs_key *key),
         TP_ARGS(sb, key),
@@ -1439,71 +1429,42 @@ TRACE_EVENT(scoutfs_rename,
 );
 
 TRACE_EVENT(scoutfs_d_revalidate,
-	TP_PROTO(struct super_block *sb, struct dentry *dentry, int flags, u64 dir_ino, int ret),
+	TP_PROTO(struct super_block *sb,
+		 struct dentry *dentry, int flags, struct dentry *parent,
+		 bool is_covered, int ret),
 
-	TP_ARGS(sb, dentry, flags, dir_ino, ret),
+	TP_ARGS(sb, dentry, flags, parent, is_covered, ret),
 
 	TP_STRUCT__entry(
 		SCSB_TRACE_FIELDS
-		__field(void *, dentry)
 		__string(name, dentry->d_name.name)
 		__field(__u64, ino)
-		__field(__u64, dir_ino)
+		__field(__u64, parent_ino)
 		__field(int, flags)
 		__field(int, is_root)
+		__field(int, is_covered)
 		__field(int, ret)
 	),
 
 	TP_fast_assign(
 		SCSB_TRACE_ASSIGN(sb);
-		__entry->dentry = dentry;
 		__assign_str(name, dentry->d_name.name)
-		__entry->ino = dentry->d_inode ? scoutfs_ino(dentry->d_inode) : 0;
-		__entry->dir_ino = dir_ino;
+		__entry->ino = dentry->d_inode ?
+			       scoutfs_ino(dentry->d_inode) : 0;
+		__entry->parent_ino = parent->d_inode ?
+			       scoutfs_ino(parent->d_inode) : 0;
 		__entry->flags = flags;
 		__entry->is_root = IS_ROOT(dentry);
+		__entry->is_covered = is_covered;
 		__entry->ret = ret;
 	),
 
-	TP_printk(SCSBF" dentry %p name %s ino %llu dir_ino %llu flags 0x%x s_root %u ret %d",
-		  SCSB_TRACE_ARGS, __entry->dentry, __get_str(name), __entry->ino, __entry->dir_ino,
-		  __entry->flags, __entry->is_root, __entry->ret)
-);
-
-TRACE_EVENT(scoutfs_validate_dentry,
-	TP_PROTO(struct super_block *sb, struct dentry *dentry, u64 dir_ino, u64 dentry_ino,
-		 u64 dent_ino, u64 refresh_gen, int ret),
-
-	TP_ARGS(sb, dentry, dir_ino, dentry_ino, dent_ino, refresh_gen, ret),
-
-	TP_STRUCT__entry(
-		SCSB_TRACE_FIELDS
-		__field(void *, dentry)
-		__field(__u64, dir_ino)
-		__string(name, dentry->d_name.name)
-		__field(__u64, dentry_ino)
-		__field(__u64, dent_ino)
-		__field(__u64, fsdata_gen)
-		__field(__u64, refresh_gen)
-		__field(int, ret)
-	),
-
-	TP_fast_assign(
-		SCSB_TRACE_ASSIGN(sb);
-		__entry->dentry = dentry;
-		__entry->dir_ino = dir_ino;
-		__assign_str(name, dentry->d_name.name)
-		__entry->dentry_ino = dentry_ino;
-		__entry->dent_ino = dent_ino;
-		__entry->fsdata_gen = (unsigned long long)dentry->d_fsdata;
-		__entry->refresh_gen = refresh_gen;
-		__entry->ret = ret;
-	),
-
-	TP_printk(SCSBF" dentry %p dir %llu name %s dentry_ino %llu dent_ino %llu fsdata_gen %llu refresh_gen %llu ret %d",
-		  SCSB_TRACE_ARGS, __entry->dentry, __entry->dir_ino, __get_str(name),
-		  __entry->dentry_ino, __entry->dent_ino, __entry->fsdata_gen,
-		  __entry->refresh_gen, __entry->ret)
+	TP_printk(SCSBF" name %s ino %llu parent_ino %llu flags 0x%x s_root %u is_covered %u ret %d",
+		  SCSB_TRACE_ARGS, __get_str(name), __entry->ino,
+		  __entry->parent_ino, __entry->flags,
+		  __entry->is_root,
+		  __entry->is_covered,
+		  __entry->ret)
 );
 
 DECLARE_EVENT_CLASS(scoutfs_super_lifecycle_class,
@@ -1680,164 +1641,6 @@ TRACE_EVENT(scoutfs_btree_walk,
 		  __entry->level, __entry->ref_blkno, __entry->ref_seq)
 );
 
-TRACE_EVENT(scoutfs_btree_set_parent,
-	TP_PROTO(struct super_block *sb,
-		 struct scoutfs_btree_root *root, struct scoutfs_key *key,
-		 struct scoutfs_btree_root *par_root),
-
-	TP_ARGS(sb, root, key, par_root),
-
-	TP_STRUCT__entry(
-		SCSB_TRACE_FIELDS
-		__field(__u64, root_blkno)
-		__field(__u64, root_seq)
-		__field(__u8, root_height)
-		sk_trace_define(key)
-		__field(__u64, par_root_blkno)
-		__field(__u64, par_root_seq)
-		__field(__u8, par_root_height)
-	),
-
-	TP_fast_assign(
-		SCSB_TRACE_ASSIGN(sb);
-		__entry->root_blkno = le64_to_cpu(root->ref.blkno);
-		__entry->root_seq = le64_to_cpu(root->ref.seq);
-		__entry->root_height = root->height;
-		sk_trace_assign(key, key);
-		__entry->par_root_blkno = le64_to_cpu(par_root->ref.blkno);
-		__entry->par_root_seq = le64_to_cpu(par_root->ref.seq);
-		__entry->par_root_height = par_root->height;
-	),
-
-	TP_printk(SCSBF" root blkno %llu seq %llu height %u, key "SK_FMT", par_root blkno %llu seq %llu height %u",
-		  SCSB_TRACE_ARGS, __entry->root_blkno, __entry->root_seq,
-		  __entry->root_height, sk_trace_args(key),
-		  __entry->par_root_blkno, __entry->par_root_seq,
-		  __entry->par_root_height)
-);
-
-TRACE_EVENT(scoutfs_btree_merge,
-	TP_PROTO(struct super_block *sb, struct scoutfs_btree_root *root,
-		 struct scoutfs_key *start, struct scoutfs_key *end),
-
-	TP_ARGS(sb, root, start, end),
-
-	TP_STRUCT__entry(
-		SCSB_TRACE_FIELDS
-		__field(__u64, root_blkno)
-		__field(__u64, root_seq)
-		__field(__u8, root_height)
-		sk_trace_define(start)
-		sk_trace_define(end)
-	),
-
-	TP_fast_assign(
-		SCSB_TRACE_ASSIGN(sb);
-		__entry->root_blkno = le64_to_cpu(root->ref.blkno);
-		__entry->root_seq = le64_to_cpu(root->ref.seq);
-		__entry->root_height = root->height;
-		sk_trace_assign(start, start);
-		sk_trace_assign(end, end);
-	),
-
-	TP_printk(SCSBF" root blkno %llu seq %llu height %u start "SK_FMT" end "SK_FMT,
-		  SCSB_TRACE_ARGS, __entry->root_blkno, __entry->root_seq,
-		  __entry->root_height, sk_trace_args(start),
-		  sk_trace_args(end))
-);
-
-TRACE_EVENT(scoutfs_btree_merge_items,
-	TP_PROTO(struct super_block *sb,
-		 struct scoutfs_btree_root *m_root,
-		 struct scoutfs_key *m_key, int m_val_len,
-		 struct scoutfs_btree_root *f_root,
-		 struct scoutfs_key *f_key, int f_val_len,
-		 int is_del),
-
-	TP_ARGS(sb, m_root, m_key, m_val_len, f_root, f_key, f_val_len, is_del),
-
-	TP_STRUCT__entry(
-		SCSB_TRACE_FIELDS
-		__field(__u64, m_root_blkno)
-		__field(__u64, m_root_seq)
-		__field(__u8, m_root_height)
-		sk_trace_define(m_key)
-		__field(int, m_val_len)
-		__field(__u64, f_root_blkno)
-		__field(__u64, f_root_seq)
-		__field(__u8, f_root_height)
-		sk_trace_define(f_key)
-		__field(int, f_val_len)
-		__field(int, is_del)
-	),
-
-	TP_fast_assign(
-		SCSB_TRACE_ASSIGN(sb);
-		__entry->m_root_blkno = m_root ?
-					le64_to_cpu(m_root->ref.blkno) : 0;
-		__entry->m_root_seq = m_root ? le64_to_cpu(m_root->ref.seq) : 0;
-		__entry->m_root_height = m_root ? m_root->height : 0;
-		sk_trace_assign(m_key, m_key);
-		__entry->m_val_len = m_val_len;
-		__entry->f_root_blkno = f_root ?
-					le64_to_cpu(f_root->ref.blkno) : 0;
-		__entry->f_root_seq = f_root ? le64_to_cpu(f_root->ref.seq) : 0;
-		__entry->f_root_height = f_root ? f_root->height : 0;
-		sk_trace_assign(f_key, f_key);
-		__entry->f_val_len = f_val_len;
-		__entry->is_del = !!is_del;
-	),
-
-	TP_printk(SCSBF" merge item root blkno %llu seq %llu height %u key "SK_FMT" val_len %d, fs item root blkno %llu seq %llu height %u key "SK_FMT" val_len %d, is_del %d",
-		  SCSB_TRACE_ARGS, __entry->m_root_blkno, __entry->m_root_seq,
-		  __entry->m_root_height, sk_trace_args(m_key),
-		  __entry->m_val_len, __entry->f_root_blkno,
-		  __entry->f_root_seq, __entry->f_root_height,
-		  sk_trace_args(f_key), __entry->f_val_len, __entry->is_del)
-);
-
-DECLARE_EVENT_CLASS(scoutfs_btree_free_blocks,
-	TP_PROTO(struct super_block *sb, struct scoutfs_btree_root *root,
-		 u64 blkno),
-
-	TP_ARGS(sb, root, blkno),
-
-	TP_STRUCT__entry(
-		SCSB_TRACE_FIELDS
-		__field(__u64, root_blkno)
-		__field(__u64, root_seq)
-		__field(__u8, root_height)
-		__field(__u64, blkno)
-	),
-
-	TP_fast_assign(
-		SCSB_TRACE_ASSIGN(sb);
-		__entry->root_blkno = le64_to_cpu(root->ref.blkno);
-		__entry->root_seq = le64_to_cpu(root->ref.seq);
-		__entry->root_height = root->height;
-		__entry->blkno = blkno;
-	),
-
-	TP_printk(SCSBF" root blkno %llu seq %llu height %u, free blkno %llu",
-		  SCSB_TRACE_ARGS, __entry->root_blkno, __entry->root_seq,
-		  __entry->root_height, __entry->blkno)
-);
-DEFINE_EVENT(scoutfs_btree_free_blocks, scoutfs_btree_free_blocks_single,
-	TP_PROTO(struct super_block *sb, struct scoutfs_btree_root *root,
-		 u64 blkno),
-	TP_ARGS(sb, root, blkno)
-);
-DEFINE_EVENT(scoutfs_btree_free_blocks, scoutfs_btree_free_blocks_leaf,
-	TP_PROTO(struct super_block *sb, struct scoutfs_btree_root *root,
-		 u64 blkno),
-	TP_ARGS(sb, root, blkno)
-);
-DEFINE_EVENT(scoutfs_btree_free_blocks, scoutfs_btree_free_blocks_parent,
-	TP_PROTO(struct super_block *sb, struct scoutfs_btree_root *root,
-		 u64 blkno),
-	TP_ARGS(sb, root, blkno)
-);
-
 TRACE_EVENT(scoutfs_online_offline_blocks,
 	TP_PROTO(struct inode *inode, s64 on_delta, s64 off_delta,
 		 u64 on_now, u64 off_now),
@@ -1894,57 +1697,6 @@ DEFINE_EVENT(scoutfs_server_client_count_class, scoutfs_server_client_down,
 	TP_ARGS(sb, rid, nr_clients)
 );
 
-DECLARE_EVENT_CLASS(scoutfs_server_commit_users_class,
-        TP_PROTO(struct super_block *sb, int holding, int applying, int nr_holders,
-		 u32 avail_before, u32 freed_before, int committing, int exceeded),
-        TP_ARGS(sb, holding, applying, nr_holders, avail_before, freed_before, committing,
-		exceeded),
-        TP_STRUCT__entry(
-		SCSB_TRACE_FIELDS
-		__field(int, holding)
-		__field(int, applying)
-		__field(int, nr_holders)
-		__field(__u32, avail_before)
-		__field(__u32, freed_before)
-		__field(int, committing)
-		__field(int, exceeded)
-        ),
-        TP_fast_assign(
-		SCSB_TRACE_ASSIGN(sb);
-		__entry->holding = !!holding;
-		__entry->applying = !!applying;
-		__entry->nr_holders = nr_holders;
-		__entry->avail_before = avail_before;
-		__entry->freed_before = freed_before;
-		__entry->committing = !!committing;
-		__entry->exceeded = !!exceeded;
-        ),
-	TP_printk(SCSBF" holding %u applying %u nr %u avail_before %u freed_before %u committing %u exceeded %u",
-		  SCSB_TRACE_ARGS, __entry->holding, __entry->applying, __entry->nr_holders,
-		  __entry->avail_before, __entry->freed_before, __entry->committing,
-		  __entry->exceeded)
-);
-DEFINE_EVENT(scoutfs_server_commit_users_class, scoutfs_server_commit_hold,
-        TP_PROTO(struct super_block *sb, int holding, int applying, int nr_holders,
-		 u32 avail_before, u32 freed_before, int committing, int exceeded),
-        TP_ARGS(sb, holding, applying, nr_holders, avail_before, freed_before, committing, exceeded)
-);
-DEFINE_EVENT(scoutfs_server_commit_users_class, scoutfs_server_commit_apply,
-        TP_PROTO(struct super_block *sb, int holding, int applying, int nr_holders,
-		 u32 avail_before, u32 freed_before, int committing, int exceeded),
-        TP_ARGS(sb, holding, applying, nr_holders, avail_before, freed_before, committing, exceeded)
-);
-DEFINE_EVENT(scoutfs_server_commit_users_class, scoutfs_server_commit_start,
-        TP_PROTO(struct super_block *sb, int holding, int applying, int nr_holders,
-		 u32 avail_before, u32 freed_before, int committing, int exceeded),
-        TP_ARGS(sb, holding, applying, nr_holders, avail_before, freed_before, committing, exceeded)
-);
-DEFINE_EVENT(scoutfs_server_commit_users_class, scoutfs_server_commit_end,
-        TP_PROTO(struct super_block *sb, int holding, int applying, int nr_holders,
-		 u32 avail_before, u32 freed_before, int committing, int exceeded),
-        TP_ARGS(sb, holding, applying, nr_holders, avail_before, freed_before, committing, exceeded)
-);
-
 #define slt_symbolic(mode)						\
 	__print_symbolic(mode,					\
 		{ SLT_CLIENT,		"client" },	\
@@ -2024,9 +1776,9 @@ DEFINE_EVENT(scoutfs_quorum_message_class, scoutfs_quorum_recv_message,
 
 TRACE_EVENT(scoutfs_quorum_loop,
 	TP_PROTO(struct super_block *sb, int role, u64 term, int vote_for,
-		 unsigned long vote_bits, unsigned long long nsecs),
+		 unsigned long vote_bits, struct timespec64 timeout),
 
-	TP_ARGS(sb, role, term, vote_for, vote_bits, nsecs),
+	TP_ARGS(sb, role, term, vote_for, vote_bits, timeout),
 
 	TP_STRUCT__entry(
 		SCSB_TRACE_FIELDS
@@ -2035,7 +1787,8 @@ TRACE_EVENT(scoutfs_quorum_loop,
 		__field(int, vote_for)
 		__field(unsigned long, vote_bits)
 		__field(unsigned long, vote_count)
-		__field(unsigned long long, nsecs)
+		__field(unsigned long long, timeout_sec)
+		__field(int, timeout_nsec)
 	),
 
 	TP_fast_assign(
@@ -2045,13 +1798,82 @@ TRACE_EVENT(scoutfs_quorum_loop,
 		__entry->vote_for = vote_for;
 		__entry->vote_bits = vote_bits;
 		__entry->vote_count = hweight_long(vote_bits);
-		__entry->nsecs = nsecs;
+		__entry->timeout_sec = timeout.tv_sec;
+		__entry->timeout_nsec = timeout.tv_nsec;
 	),
 
-	TP_printk(SCSBF" term %llu role %d vote_for %d vote_bits 0x%lx vote_count %lu timeout %llu",
+	TP_printk(SCSBF" term %llu role %d vote_for %d vote_bits 0x%lx vote_count %lu timeout %llu.%u",
 		  SCSB_TRACE_ARGS, __entry->term, __entry->role,
 		  __entry->vote_for, __entry->vote_bits, __entry->vote_count,
-		  __entry->nsecs)
+		  __entry->timeout_sec, __entry->timeout_nsec)
+);
+
+/*
+ * We can emit trace events to make it easier to synchronize the
+ * monotonic clocks in trace logs between nodes.  By looking at the send
+ * and recv times of many messages flowing between nodes we can get
+ * surprisingly good estimates of the clock offset between them.
+ */
+DECLARE_EVENT_CLASS(scoutfs_clock_sync_class,
+	TP_PROTO(__le64 clock_sync_id),
+	TP_ARGS(clock_sync_id),
+	TP_STRUCT__entry(
+		__field(__u64, clock_sync_id)
+	),
+	TP_fast_assign(
+		__entry->clock_sync_id = le64_to_cpu(clock_sync_id);
+	),
+	TP_printk("clock_sync_id %016llx", __entry->clock_sync_id)
+);
+DEFINE_EVENT(scoutfs_clock_sync_class, scoutfs_send_clock_sync,
+	TP_PROTO(__le64 clock_sync_id),
+	TP_ARGS(clock_sync_id)
+);
+DEFINE_EVENT(scoutfs_clock_sync_class, scoutfs_recv_clock_sync,
+	TP_PROTO(__le64 clock_sync_id),
+	TP_ARGS(clock_sync_id)
+);
+
+TRACE_EVENT(scoutfs_trans_seq_advance,
+	TP_PROTO(struct super_block *sb, u64 rid, u64 trans_seq),
+
+	TP_ARGS(sb, rid, trans_seq),
+
+	TP_STRUCT__entry(
+		SCSB_TRACE_FIELDS
+		__field(__u64, s_rid)
+		__field(__u64, trans_seq)
+	),
+
+	TP_fast_assign(
+		SCSB_TRACE_ASSIGN(sb);
+		__entry->s_rid = rid;
+		__entry->trans_seq = trans_seq;
+	),
+
+	TP_printk(SCSBF" rid %016llx trans_seq %llu\n",
+		  SCSB_TRACE_ARGS, __entry->s_rid, __entry->trans_seq)
+);
+
+TRACE_EVENT(scoutfs_trans_seq_remove,
+	TP_PROTO(struct super_block *sb, u64 rid, u64 trans_seq),
+
+	TP_ARGS(sb, rid, trans_seq),
+
+	TP_STRUCT__entry(
+		SCSB_TRACE_FIELDS
+		__field(__u64, s_rid)
+		__field(__u64, trans_seq)
+	),
+
+	TP_fast_assign(
+		SCSB_TRACE_ASSIGN(sb);
+		__entry->s_rid = rid;
+		__entry->trans_seq = trans_seq;
+	),
+
+	TP_printk(SCSBF" rid %016llx trans_seq %llu",
+		  SCSB_TRACE_ARGS, __entry->s_rid, __entry->trans_seq)
 );
 
 TRACE_EVENT(scoutfs_trans_seq_last,
@@ -2075,114 +1897,6 @@ TRACE_EVENT(scoutfs_trans_seq_last,
 		  SCSB_TRACE_ARGS, __entry->s_rid, __entry->trans_seq)
 );
 
-TRACE_EVENT(scoutfs_get_log_merge_status,
-	TP_PROTO(struct super_block *sb, u64 rid, struct scoutfs_key *next_range_key,
-		 u64 nr_requests, u64 nr_complete, u64 seq),
-
-	TP_ARGS(sb, rid, next_range_key, nr_requests, nr_complete, seq),
-
-	TP_STRUCT__entry(
-		SCSB_TRACE_FIELDS
-		__field(__u64, s_rid)
-		sk_trace_define(next_range_key)
-		__field(__u64, nr_requests)
-		__field(__u64, nr_complete)
-		__field(__u64, seq)
-	),
-
-	TP_fast_assign(
-		SCSB_TRACE_ASSIGN(sb);
-		__entry->s_rid = rid;
-		sk_trace_assign(next_range_key, next_range_key);
-		__entry->nr_requests = nr_requests;
-		__entry->nr_complete = nr_complete;
-		__entry->seq = seq;
-	),
-
-	TP_printk(SCSBF" rid %016llx next_range_key "SK_FMT" nr_requests %llu nr_complete %llu seq %llu",
-		  SCSB_TRACE_ARGS, __entry->s_rid, sk_trace_args(next_range_key),
-		  __entry->nr_requests, __entry->nr_complete, __entry->seq)
-);
-
-TRACE_EVENT(scoutfs_get_log_merge_request,
-	TP_PROTO(struct super_block *sb, u64 rid,
-		 struct scoutfs_btree_root *root, struct scoutfs_key *start,
-		 struct scoutfs_key *end, u64 input_seq, u64 seq),
-
-	TP_ARGS(sb, rid, root, start, end, input_seq, seq),
-
-	TP_STRUCT__entry(
-		SCSB_TRACE_FIELDS
-		__field(__u64, s_rid)
-		__field(__u64, root_blkno)
-		__field(__u64, root_seq)
-		__field(__u8, root_height)
-		sk_trace_define(start)
-		sk_trace_define(end)
-		__field(__u64, input_seq)
-		__field(__u64, seq)
-	),
-
-	TP_fast_assign(
-		SCSB_TRACE_ASSIGN(sb);
-		__entry->s_rid = rid;
-		__entry->root_blkno = le64_to_cpu(root->ref.blkno);
-		__entry->root_seq = le64_to_cpu(root->ref.seq);
-		__entry->root_height = root->height;
-		sk_trace_assign(start, start);
-		sk_trace_assign(end, end);
-		__entry->input_seq = input_seq;
-		__entry->seq = seq;
-	),
-
-	TP_printk(SCSBF" rid %016llx root blkno %llu seq %llu height %u start "SK_FMT" end "SK_FMT" input_seq %llu seq %llu",
-		  SCSB_TRACE_ARGS, __entry->s_rid, __entry->root_blkno,
-		  __entry->root_seq, __entry->root_height,
-		  sk_trace_args(start), sk_trace_args(end), __entry->input_seq,
-		  __entry->seq)
-);
-
-TRACE_EVENT(scoutfs_get_log_merge_complete,
-	TP_PROTO(struct super_block *sb, u64 rid,
-		 struct scoutfs_btree_root *root, struct scoutfs_key *start,
-		 struct scoutfs_key *end, struct scoutfs_key *remain,
-		 u64 seq, u64 flags),
-
-	TP_ARGS(sb, rid, root, start, end, remain, seq, flags),
-
-	TP_STRUCT__entry(
-		SCSB_TRACE_FIELDS
-		__field(__u64, s_rid)
-		__field(__u64, root_blkno)
-		__field(__u64, root_seq)
-		__field(__u8, root_height)
-		sk_trace_define(start)
-		sk_trace_define(end)
-		sk_trace_define(remain)
-		__field(__u64, seq)
-		__field(__u64, flags)
-	),
-
-	TP_fast_assign(
-		SCSB_TRACE_ASSIGN(sb);
-		__entry->s_rid = rid;
-		__entry->root_blkno = le64_to_cpu(root->ref.blkno);
-		__entry->root_seq = le64_to_cpu(root->ref.seq);
-		__entry->root_height = root->height;
-		sk_trace_assign(start, start);
-		sk_trace_assign(end, end);
-		sk_trace_assign(remain, remain);
-		__entry->seq = seq;
-		__entry->flags = flags;
-	),
-
-	TP_printk(SCSBF" rid %016llx root blkno %llu seq %llu height %u start "SK_FMT" end "SK_FMT" remain "SK_FMT" seq %llu flags 0x%llx",
-		  SCSB_TRACE_ARGS, __entry->s_rid, __entry->root_blkno,
-		  __entry->root_seq, __entry->root_height,
-		  sk_trace_args(start), sk_trace_args(end),
-		  sk_trace_args(remain), __entry->seq, __entry->flags)
-);
-
 DECLARE_EVENT_CLASS(scoutfs_forest_bloom_class,
 	TP_PROTO(struct super_block *sb, struct scoutfs_key *key,
 		 u64 rid, u64 nr, u64 blkno, u64 seq, unsigned int count),
@@ -2641,36 +2355,6 @@ TRACE_EVENT(scoutfs_alloc_move,
 		  __entry->ret)
 );
 
-DECLARE_EVENT_CLASS(scoutfs_alloc_extent_class,
-	TP_PROTO(struct super_block *sb, struct scoutfs_extent *ext),
-
-	TP_ARGS(sb, ext),
-
-	TP_STRUCT__entry(
-		SCSB_TRACE_FIELDS
-		STE_FIELDS(ext)
-	),
-
-	TP_fast_assign(
-		SCSB_TRACE_ASSIGN(sb);
-		STE_ASSIGN(ext, ext);
-	),
-
-	TP_printk(SCSBF" ext "STE_FMT, SCSB_TRACE_ARGS, STE_ENTRY_ARGS(ext))
-);
-DEFINE_EVENT(scoutfs_alloc_extent_class, scoutfs_alloc_move_extent,
-	TP_PROTO(struct super_block *sb, struct scoutfs_extent *ext),
-	TP_ARGS(sb, ext)
-);
-DEFINE_EVENT(scoutfs_alloc_extent_class, scoutfs_alloc_fill_extent,
-	TP_PROTO(struct super_block *sb, struct scoutfs_extent *ext),
-	TP_ARGS(sb, ext)
-);
-DEFINE_EVENT(scoutfs_alloc_extent_class, scoutfs_alloc_empty_extent,
-	TP_PROTO(struct super_block *sb, struct scoutfs_extent *ext),
-	TP_ARGS(sb, ext)
-);
-
 TRACE_EVENT(scoutfs_item_read_page,
 	TP_PROTO(struct super_block *sb, struct scoutfs_key *key,
 		 struct scoutfs_key *pg_start, struct scoutfs_key *pg_end),
@@ -2718,87 +2402,6 @@ TRACE_EVENT(scoutfs_item_invalidate_page,
 		  sk_trace_args(pg_start), sk_trace_args(pg_end), __entry->pgi)
 );
 
-DECLARE_EVENT_CLASS(scoutfs_omap_group_class,
-	TP_PROTO(struct super_block *sb, void *grp, u64 group_nr, unsigned int group_total,
-		 int bit_nr),
-
-	TP_ARGS(sb, grp, group_nr, group_total, bit_nr),
-
-	TP_STRUCT__entry(
-		SCSB_TRACE_FIELDS
-		__field(void *, grp)
-		__field(__u64, group_nr)
-		__field(unsigned int, group_total)
-		__field(int, bit_nr)
-	),
-
-	TP_fast_assign(
-		SCSB_TRACE_ASSIGN(sb);
-		__entry->grp = grp;
-		__entry->group_nr = group_nr;
-		__entry->group_total = group_total;
-		__entry->bit_nr = bit_nr;
-	),
-
-	TP_printk(SCSBF" grp %p group_nr %llu group_total %u bit_nr %d",
-		  SCSB_TRACE_ARGS, __entry->grp, __entry->group_nr, __entry->group_total,
-		  __entry->bit_nr)
-);
-
-DEFINE_EVENT(scoutfs_omap_group_class, scoutfs_omap_group_alloc,
-	TP_PROTO(struct super_block *sb, void *grp, u64 group_nr, unsigned int group_total,
-		 int bit_nr),
-	TP_ARGS(sb, grp, group_nr, group_total, bit_nr)
-);
-DEFINE_EVENT(scoutfs_omap_group_class, scoutfs_omap_group_free,
-	TP_PROTO(struct super_block *sb, void *grp, u64 group_nr, unsigned int group_total,
-		 int bit_nr),
-	TP_ARGS(sb, grp, group_nr, group_total, bit_nr)
-);
-DEFINE_EVENT(scoutfs_omap_group_class, scoutfs_omap_group_inc,
-	TP_PROTO(struct super_block *sb, void *grp, u64 group_nr, unsigned int group_total,
-		 int bit_nr),
-	TP_ARGS(sb, grp, group_nr, group_total, bit_nr)
-);
-DEFINE_EVENT(scoutfs_omap_group_class, scoutfs_omap_group_dec,
-	TP_PROTO(struct super_block *sb, void *grp, u64 group_nr, unsigned int group_total,
-		 int bit_nr),
-	TP_ARGS(sb, grp, group_nr, group_total, bit_nr)
-);
-DEFINE_EVENT(scoutfs_omap_group_class, scoutfs_omap_group_request,
-	TP_PROTO(struct super_block *sb, void *grp, u64 group_nr, unsigned int group_total,
-		 int bit_nr),
-	TP_ARGS(sb, grp, group_nr, group_total, bit_nr)
-);
-DEFINE_EVENT(scoutfs_omap_group_class, scoutfs_omap_group_destroy,
-	TP_PROTO(struct super_block *sb, void *grp, u64 group_nr, unsigned int group_total,
-		 int bit_nr),
-	TP_ARGS(sb, grp, group_nr, group_total, bit_nr)
-);
-
-TRACE_EVENT(scoutfs_omap_should_delete,
-	TP_PROTO(struct super_block *sb, u64 ino, unsigned int nlink, int ret),
-
-	TP_ARGS(sb, ino, nlink, ret),
-
-	TP_STRUCT__entry(
-		SCSB_TRACE_FIELDS
-		__field(__u64, ino)
-		__field(unsigned int, nlink)
-		__field(int, ret)
-	),
-
-	TP_fast_assign(
-		SCSB_TRACE_ASSIGN(sb);
-		__entry->ino = ino;
-		__entry->nlink = nlink;
-		__entry->ret = ret;
-	),
-
-	TP_printk(SCSBF" ino %llu nlink %u ret %d",
-		  SCSB_TRACE_ARGS, __entry->ino, __entry->nlink, __entry->ret)
-);
-
 #endif /* _TRACE_SCOUTFS_H */
 
 /* This part must be outside protection */

kmod/src/server.h

@@ -56,31 +56,22 @@ do {								\
 	__entry->name##_data_len, __entry->name##_cmd, __entry->name##_flags, \
 	__entry->name##_error
 
-u64 scoutfs_server_reserved_meta_blocks(struct super_block *sb);
-
 int scoutfs_server_lock_request(struct super_block *sb, u64 rid,
 				struct scoutfs_net_lock *nl);
 int scoutfs_server_lock_response(struct super_block *sb, u64 rid, u64 id,
-				 struct scoutfs_net_lock *nl);
+				 struct scoutfs_net_lock_grant_response *gr);
 int scoutfs_server_lock_recover_request(struct super_block *sb, u64 rid,
 					struct scoutfs_key *key);
-void scoutfs_server_recov_finish(struct super_block *sb, u64 rid, int which);
+void scoutfs_server_get_roots(struct super_block *sb,
+			      struct scoutfs_net_roots *roots);
+int scoutfs_server_hold_commit(struct super_block *sb);
+int scoutfs_server_apply_commit(struct super_block *sb, int err);
 
-int scoutfs_server_send_omap_request(struct super_block *sb, u64 rid,
-				     struct scoutfs_open_ino_map_args *args);
-int scoutfs_server_send_omap_response(struct super_block *sb, u64 rid, u64 id,
-				      struct scoutfs_open_ino_map *map, int err);
-
-u64 scoutfs_server_seq(struct super_block *sb);
-u64 scoutfs_server_next_seq(struct super_block *sb);
-void scoutfs_server_set_seq_if_greater(struct super_block *sb, u64 seq);
-
-void scoutfs_server_start(struct super_block *sb, struct scoutfs_quorum_config *qconf, u64 term);
+struct sockaddr_in;
+struct scoutfs_quorum_elected_info;
+int scoutfs_server_start(struct super_block *sb, u64 term);
+void scoutfs_server_abort(struct super_block *sb);
 void scoutfs_server_stop(struct super_block *sb);
-void scoutfs_server_stop_wait(struct super_block *sb);
-bool scoutfs_server_is_running(struct super_block *sb);
-bool scoutfs_server_is_up(struct super_block *sb);
-bool scoutfs_server_is_down(struct super_block *sb);
 
 int scoutfs_server_setup(struct super_block *sb);
 void scoutfs_server_destroy(struct super_block *sb);

kmod/src/srch.c

@@ -28,7 +28,6 @@
 #include "btree.h"
 #include "spbm.h"
 #include "client.h"
-#include "counters.h"
 #include "scoutfs_trace.h"
 
 /*
@@ -861,6 +860,7 @@ int scoutfs_srch_search_xattrs(struct super_block *sb,
 			       struct scoutfs_srch_rb_root *sroot,
 			       u64 hash, u64 ino, u64 last_ino, bool *done)
 {
+	struct scoutfs_net_roots prev_roots;
 	struct scoutfs_net_roots roots;
 	struct scoutfs_srch_entry start;
 	struct scoutfs_srch_entry end;
@@ -868,7 +868,6 @@ int scoutfs_srch_search_xattrs(struct super_block *sb,
 	struct scoutfs_log_trees lt;
 	struct scoutfs_srch_file sfl;
 	SCOUTFS_BTREE_ITEM_REF(iref);
-	DECLARE_SAVED_REFS(saved);
 	struct scoutfs_key key;
 	unsigned long limit = SRCH_LIMIT;
 	int ret;
@@ -877,6 +876,7 @@ int scoutfs_srch_search_xattrs(struct super_block *sb,
 
 	*done = false;
 	srch_init_rb_root(sroot);
+	memset(&prev_roots, 0, sizeof(prev_roots));
 
 	start.hash = cpu_to_le64(hash);
 	start.ino = cpu_to_le64(ino);
@@ -891,6 +891,7 @@ retry:
 	ret = scoutfs_client_get_roots(sb, &roots);
 	if (ret)
 		goto out;
+	memset(&roots.fs_root, 0, sizeof(roots.fs_root));
 
 	end = final;
 
@@ -966,10 +967,16 @@ retry:
 	*done = sre_cmp(&end, &final) == 0;
 	ret = 0;
 out:
-	ret = scoutfs_block_check_stale(sb, ret, &saved, &roots.srch_root.ref,
-					&roots.logs_root.ref);
-	if (ret == -ESTALE)
-		goto retry;
+	if (ret == -ESTALE) {
+		if (memcmp(&prev_roots, &roots, sizeof(roots)) == 0) {
+			scoutfs_inc_counter(sb, srch_search_stale_eio);
+			ret = -EIO;
+		} else {
+			scoutfs_inc_counter(sb, srch_search_stale_retry);
+			prev_roots = roots;
+			goto retry;
+		}
+	}
 
 	return ret;
 }
@@ -982,27 +989,18 @@ int scoutfs_srch_rotate_log(struct super_block *sb,
 			    struct scoutfs_alloc *alloc,
 			    struct scoutfs_block_writer *wri,
 			    struct scoutfs_btree_root *root,
-			    struct scoutfs_srch_file *sfl, bool force)
+			    struct scoutfs_srch_file *sfl)
 {
 	struct scoutfs_key key;
 	int ret;
 
-	if (sfl->ref.blkno == 0 ||
-	    (!force && le64_to_cpu(sfl->blocks) < SCOUTFS_SRCH_LOG_BLOCK_LIMIT))
+	if (le64_to_cpu(sfl->blocks) < SCOUTFS_SRCH_LOG_BLOCK_LIMIT)
 		return 0;
 
 	init_srch_key(&key, SCOUTFS_SRCH_LOG_TYPE,
 		      le64_to_cpu(sfl->ref.blkno), 0);
 	ret = scoutfs_btree_insert(sb, alloc, wri, root, &key,
 				   sfl, sizeof(*sfl));
-	/*
-	 * While it's fine to replay moving the client's logging srch
-	 * file to the core btree item, server commits should keep it
-	 * from happening.  So we'll warn if we see it happen.  This can
-	 * be removed eventually.
-	 */
-	if (WARN_ON_ONCE(ret == -EEXIST))
-		ret = 0;
 	if (ret == 0) {
 		memset(sfl, 0, sizeof(*sfl));
 		scoutfs_inc_counter(sb, srch_rotate_log);
@@ -1482,11 +1480,10 @@ static int kway_merge(struct super_block *sb,
 	int ind;
 	int i;
 
-	if (WARN_ON_ONCE(nr <= 0))
+	if (WARN_ON_ONCE(nr <= 1))
 		return -EINVAL;
 
-	/* always at least one parent for single leaf */
-	nr_parents = max_t(unsigned long, 1, roundup_pow_of_two(nr) - 1);
+	nr_parents = roundup_pow_of_two(nr) - 1;
 	/* root at [1] for easy sib/parent index calc, final pad for odd sib */
 	nr_nodes = 1 + nr_parents + nr + 1;
 	tnodes = __vmalloc(nr_nodes * sizeof(struct tourn_node),
@@ -1747,7 +1744,7 @@ static int compact_logs(struct super_block *sb,
 				goto out;
 			}
 			page->private = 0;
-			list_add_tail(&page->lru, &pages);
+			list_add_tail(&page->list, &pages);
 			nr_pages++;
 			scoutfs_inc_counter(sb, srch_compact_log_page);
 		}
@@ -1800,7 +1797,7 @@ static int compact_logs(struct super_block *sb,
 
 	/* sort page entries and reset private for _next */
 	i = 0;
-	list_for_each_entry(page, &pages, lru) {
+	list_for_each_entry(page, &pages, list) {
 		args[i++] = page;
 
 		if (atomic_read(&srinf->shutdown)) {
@@ -1821,7 +1818,7 @@ static int compact_logs(struct super_block *sb,
 		goto out;
 
 	/* make sure we finished all the pages */
-	list_for_each_entry(page, &pages, lru) {
+	list_for_each_entry(page, &pages, list) {
 		sre = page_priv_sre(page);
 		if (page->private < SRES_PER_PAGE && sre->ino != 0) {
 			ret = -ENOSPC;
@@ -1834,8 +1831,8 @@ static int compact_logs(struct super_block *sb,
 out:
 	scoutfs_block_put(sb, bl);
 	vfree(args);
-	list_for_each_entry_safe(page, tmp, &pages, lru) {
-		list_del(&page->lru);
+	list_for_each_entry_safe(page, tmp, &pages, list) {
+		list_del(&page->list);
 		__free_page(page);
 	}
 
@@ -2083,7 +2080,7 @@ static int delete_files(struct super_block *sb, struct scoutfs_alloc *alloc,
 		       struct scoutfs_block_writer *wri,
 		       struct scoutfs_srch_compact *sc)
 {
-	int ret = 0;
+	int ret;
 	int i;
 
 	for (i = 0; i < sc->nr; i++) {
@@ -2129,7 +2126,6 @@ static void scoutfs_srch_compact_worker(struct work_struct *work)
 	struct scoutfs_alloc alloc;
 	unsigned long delay;
 	int ret;
-	int err;
 
 	sc = kmalloc(sizeof(struct scoutfs_srch_compact), GFP_NOFS);
 	if (sc == NULL) {
@@ -2160,22 +2156,17 @@ static void scoutfs_srch_compact_worker(struct work_struct *work)
 	if (ret < 0)
 		goto commit;
 
-	ret = scoutfs_alloc_prepare_commit(sb, &alloc, &wri) ?:
-	      scoutfs_block_writer_write(sb, &wri);
+	ret = scoutfs_block_writer_write(sb, &wri);
 commit:
 	/* the server won't use our partial compact if _ERROR is set */
 	sc->meta_avail = alloc.avail;
 	sc->meta_freed = alloc.freed;
 	sc->flags |= ret < 0 ? SCOUTFS_SRCH_COMPACT_FLAG_ERROR : 0;
 
-	err = scoutfs_client_srch_commit_compact(sb, sc);
-	if (err < 0 && ret == 0)
-		ret = err;
+	ret = scoutfs_client_srch_commit_compact(sb, sc);
 out:
 	/* our allocators and files should be stable */
 	WARN_ON_ONCE(ret == -ESTALE);
-	if (ret < 0)
-		scoutfs_inc_counter(sb, srch_compact_error);
 
 	scoutfs_block_writer_forget_all(sb, &wri);
 	if (!atomic_read(&srinf->shutdown)) {

kmod/src/srch.h

@@ -37,7 +37,7 @@ int scoutfs_srch_rotate_log(struct super_block *sb,
 			    struct scoutfs_alloc *alloc,
 			    struct scoutfs_block_writer *wri,
 			    struct scoutfs_btree_root *root,
-			    struct scoutfs_srch_file *sfl, bool force);
+			    struct scoutfs_srch_file *sfl);
 int scoutfs_srch_get_compact(struct super_block *sb,
 			     struct scoutfs_alloc *alloc,
 			     struct scoutfs_block_writer *wri,

kmod/src/super.c

@@ -13,7 +13,6 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/fs.h>
-#include <linux/blkdev.h>
 #include <linux/slab.h>
 #include <linux/pagemap.h>
 #include <linux/magic.h>
@@ -21,6 +20,7 @@
 #include <linux/statfs.h>
 #include <linux/sched.h>
 #include <linux/debugfs.h>
+#include <linux/percpu.h>
 
 #include "super.h"
 #include "block.h"
@@ -44,43 +44,70 @@
 #include "srch.h"
 #include "item.h"
 #include "alloc.h"
-#include "recov.h"
-#include "omap.h"
-#include "volopt.h"
-#include "fence.h"
-#include "xattr.h"
 #include "scoutfs_trace.h"
 
 static struct dentry *scoutfs_debugfs_root;
 
-/* the statfs file fields can be small (and signed?) :/ */
-static __statfs_word saturate_truncated_word(u64 files)
-{
-	__statfs_word word = files;
+static DEFINE_PER_CPU(u64, clock_sync_ids) = 0;
 
-	if (word != files) {
-		word = ~0ULL;
-		if (word < 0)
-			word = (unsigned long)word >> 1;
+/*
+ * Give the caller a unique clock sync id for a message they're about to
+ * send.  We make the ids reasonably globally unique by using randomly
+ * initialized per-cpu 64bit counters.
+ */
+__le64 scoutfs_clock_sync_id(void)
+{
+	u64 rnd = 0;
+	u64 ret;
+	u64 *id;
+
+retry:
+	preempt_disable();
+	id = this_cpu_ptr(&clock_sync_ids);
+	if (*id == 0) {
+		if (rnd == 0) {
+			preempt_enable();
+			get_random_bytes(&rnd, sizeof(rnd));
+			goto retry;
+		}
+		*id = rnd;
 	}
 
-	return word;
+	ret = ++(*id);
+	preempt_enable();
+
+	return cpu_to_le64(ret);
+}
+
+struct statfs_free_blocks {
+	u64 meta;
+	u64 data;
+};
+
+static int count_free_blocks(struct super_block *sb, void *arg, int owner,
+			     u64 id, bool meta, bool avail, u64 blocks)
+{
+	struct statfs_free_blocks *sfb = arg;
+
+	if (meta)
+		sfb->meta += blocks;
+	else
+		sfb->data += blocks;
+
+	return 0;
 }
 
 /*
- * The server gives us the current sum of free blocks and the total
- * inode count that it can see across all the clients' log trees.  It
- * won't see allocations and inode creations or deletions that are dirty
- * in client memory as it builds a transaction.
+ * Build the free block counts by having alloc read all the persistent
+ * blocks which contain allocators and calling us for each of them.
+ * Only the super block reads aren't cached so repeatedly calling statfs
+ * is like repeated O_DIRECT IO.  We can add a cache and stale results
+ * if that IO becomes a problem.
  *
- * We don't have static limits on the number of files so the statfs
- * fields for the total possible files and the number free isn't
- * particularly helpful.  What we do want to report is the number of
- * inodes, so we fake a max possible number of inodes given a
- * conservative estimate of the total space consumption per file and
- * then find the free by subtracting our precise count of active inodes.
- * This seems like the least surprising compromise where the file max
- * doesn't change and the caller gets the correct count of used inodes.
+ * We fake the number of free inodes value by assuming that we can fill
+ * free blocks with a certain number of inodes.  We then the number of
+ * current inodes to that free count to determine the total possible
+ * inodes.
  *
  * The fsid that we report is constructed from the xor of the first two
  * and second two little endian u32s that make up the uuid bytes.
@@ -88,33 +115,41 @@ static __statfs_word saturate_truncated_word(u64 files)
 static int scoutfs_statfs(struct dentry *dentry, struct kstatfs *kst)
 {
 	struct super_block *sb = dentry->d_inode->i_sb;
-	struct scoutfs_net_statfs nst;
-	u64 files;
-	u64 ffree;
+	struct scoutfs_super_block *super = NULL;
+	struct statfs_free_blocks sfb = {0,};
 	__le32 uuid[4];
 	int ret;
 
 	scoutfs_inc_counter(sb, statfs);
 
-	ret = scoutfs_client_statfs(sb, &nst);
+	super = kzalloc(sizeof(struct scoutfs_super_block), GFP_NOFS);
+	if (!super) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ret = scoutfs_read_super(sb, super);
 	if (ret)
 		goto out;
 
-	kst->f_bfree = (le64_to_cpu(nst.free_meta_blocks) << SCOUTFS_BLOCK_SM_LG_SHIFT) +
-		       le64_to_cpu(nst.free_data_blocks);
+	ret = scoutfs_alloc_foreach(sb, count_free_blocks, &sfb);
+	if (ret < 0)
+		goto out;
+
+	kst->f_bfree = (sfb.meta << SCOUTFS_BLOCK_SM_LG_SHIFT) + sfb.data;
 	kst->f_type = SCOUTFS_SUPER_MAGIC;
 	kst->f_bsize = SCOUTFS_BLOCK_SM_SIZE;
-	kst->f_blocks = (le64_to_cpu(nst.total_meta_blocks) << SCOUTFS_BLOCK_SM_LG_SHIFT) +
-			le64_to_cpu(nst.total_data_blocks);
+	kst->f_blocks = (le64_to_cpu(super->total_meta_blocks) <<
+			 SCOUTFS_BLOCK_SM_LG_SHIFT) +
+			le64_to_cpu(super->total_data_blocks);
 	kst->f_bavail = kst->f_bfree;
 
-	files = div_u64(le64_to_cpu(nst.total_meta_blocks) << SCOUTFS_BLOCK_LG_SHIFT, 2048);
-	ffree = files - le64_to_cpu(nst.inode_count);
-	kst->f_files = saturate_truncated_word(files);
-	kst->f_ffree = saturate_truncated_word(ffree);
+	/* arbitrarily assume ~1K / empty file */
+	kst->f_ffree = sfb.meta * (SCOUTFS_BLOCK_LG_SIZE / 1024);
+	kst->f_files = kst->f_ffree + le64_to_cpu(super->next_ino);
 
-	BUILD_BUG_ON(sizeof(uuid) != sizeof(nst.uuid));
-	memcpy(uuid, nst.uuid, sizeof(uuid));
+	BUILD_BUG_ON(sizeof(uuid) != sizeof(super->uuid));
+	memcpy(uuid, super->uuid, sizeof(uuid));
 	kst->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[1]);
 	kst->f_fsid.val[1] = le32_to_cpu(uuid[2]) ^ le32_to_cpu(uuid[3]);
 	kst->f_namelen = SCOUTFS_NAME_LEN;
@@ -123,17 +158,57 @@ static int scoutfs_statfs(struct dentry *dentry, struct kstatfs *kst)
 	/* the vfs fills f_flags */
 	ret = 0;
 out:
+	kfree(super);
+
 	/*
 	 * We don't take cluster locks in statfs which makes it a very
 	 * convenient place to trigger lock reclaim for debugging. We
 	 * try to free as many locks as possible.
 	 */
 	if (scoutfs_trigger(sb, STATFS_LOCK_PURGE))
-		scoutfs_free_unused_locks(sb);
+		scoutfs_free_unused_locks(sb, -1UL);
 
 	return ret;
 }
 
+static int scoutfs_show_options(struct seq_file *seq, struct dentry *root)
+{
+	struct super_block *sb = root->d_sb;
+	struct mount_options *opts = &SCOUTFS_SB(sb)->opts;
+
+	if (opts->quorum_slot_nr >= 0)
+		seq_printf(seq, ",quorum_slot_nr=%d", opts->quorum_slot_nr);
+	seq_printf(seq, ",metadev_path=%s", opts->metadev_path);
+
+	return 0;
+}
+
+static ssize_t metadev_path_show(struct kobject *kobj,
+				 struct kobj_attribute *attr, char *buf)
+{
+	struct super_block *sb = SCOUTFS_SYSFS_ATTRS_SB(kobj);
+	struct mount_options *opts = &SCOUTFS_SB(sb)->opts;
+
+	return snprintf(buf, PAGE_SIZE, "%s", opts->metadev_path);
+}
+SCOUTFS_ATTR_RO(metadev_path);
+
+static ssize_t quorum_server_nr_show(struct kobject *kobj,
+			      struct kobj_attribute *attr, char *buf)
+{
+	struct super_block *sb = SCOUTFS_SYSFS_ATTRS_SB(kobj);
+	struct mount_options *opts = &SCOUTFS_SB(sb)->opts;
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", opts->quorum_slot_nr);
+}
+SCOUTFS_ATTR_RO(quorum_server_nr);
+
+static struct attribute *mount_options_attrs[] = {
+	SCOUTFS_ATTR_PTR(metadev_path),
+	SCOUTFS_ATTR_PTR(quorum_server_nr),
+	NULL,
+};
+
 static int scoutfs_sync_fs(struct super_block *sb, int wait)
 {
 	trace_scoutfs_sync_fs(sb, wait);
@@ -151,15 +226,7 @@ static void scoutfs_metadev_close(struct super_block *sb)
 	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
 
 	if (sbi->meta_bdev) {
-		/*
-		 * Some kernels have blkdev_reread_part which calls
-		 * fsync_bdev while holding the bd_mutex which inverts
-		 * the s_umount hold in deactivate_super and blkdev_put
-		 * from kill_sb->put_super.
-		 */
-		lockdep_off();
 		blkdev_put(sbi->meta_bdev, SCOUTFS_META_BDEV_MODE);
-		lockdep_on();
 		sbi->meta_bdev = NULL;
 	}
 }
@@ -176,67 +243,41 @@ static void scoutfs_put_super(struct super_block *sb)
 
 	trace_scoutfs_put_super(sb);
 
-	/*
-	 * Wait for invalidation and iput to finish with any lingering
-	 * inode references that escaped the evict_inodes in
-	 * generic_shutdown_super.  SB_ACTIVE is clear so final iput
-	 * will always evict.
-	 */
-	scoutfs_lock_flush_invalidate(sb);
-	scoutfs_inode_flush_iput(sb);
-	WARN_ON_ONCE(!list_empty(&sb->s_inodes));
+	sbi->shutdown = true;
 
-	scoutfs_forest_stop(sb);
+	scoutfs_data_destroy(sb);
 	scoutfs_srch_destroy(sb);
 
-	scoutfs_lock_shutdown(sb);
+	scoutfs_unlock(sb, sbi->rid_lock, SCOUTFS_LOCK_WRITE);
+	sbi->rid_lock = NULL;
 
 	scoutfs_shutdown_trans(sb);
-	scoutfs_volopt_destroy(sb);
 	scoutfs_client_destroy(sb);
 	scoutfs_inode_destroy(sb);
 	scoutfs_item_destroy(sb);
 	scoutfs_forest_destroy(sb);
-	scoutfs_data_destroy(sb);
 
 	scoutfs_quorum_destroy(sb);
+	scoutfs_lock_shutdown(sb);
 	scoutfs_server_destroy(sb);
-	scoutfs_recov_destroy(sb);
 	scoutfs_net_destroy(sb);
 	scoutfs_lock_destroy(sb);
-	scoutfs_omap_destroy(sb);
 
 	scoutfs_block_destroy(sb);
 	scoutfs_destroy_triggers(sb);
-	scoutfs_fence_destroy(sb);
 	scoutfs_options_destroy(sb);
+	scoutfs_sysfs_destroy_attrs(sb, &sbi->mopts_ssa);
 	debugfs_remove(sbi->debug_root);
 	scoutfs_destroy_counters(sb);
 	scoutfs_destroy_sysfs(sb);
 	scoutfs_metadev_close(sb);
 
+	kfree(sbi->opts.metadev_path);
 	kfree(sbi);
 
 	sb->s_fs_info = NULL;
 }
 
-/*
- * Record that we're performing a forced unmount.  As put_super drives
- * destruction of the filesystem we won't issue more network or storage
- * operations because we assume that they'll hang.  Pending operations
- * can return errors when it's possible to do so.  We may be racing with
- * pending operations which can't be canceled.
- */
-static void scoutfs_umount_begin(struct super_block *sb)
-{
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-
-	scoutfs_warn(sb, "forcing unmount, can return errors and lose unsynced data");
-	sbi->forced_unmount = true;
-
-	scoutfs_client_net_shutdown(sb);
-}
-
 static const struct super_operations scoutfs_super_ops = {
 	.alloc_inode = scoutfs_alloc_inode,
 	.drop_inode = scoutfs_drop_inode,
@@ -244,9 +285,8 @@ static const struct super_operations scoutfs_super_ops = {
 	.destroy_inode = scoutfs_destroy_inode,
 	.sync_fs = scoutfs_sync_fs,
 	.statfs = scoutfs_statfs,
-	.show_options = scoutfs_options_show,
+	.show_options = scoutfs_show_options,
 	.put_super = scoutfs_put_super,
-	.umount_begin = scoutfs_umount_begin,
 };
 
 /*
@@ -266,16 +306,28 @@ int scoutfs_write_super(struct super_block *sb,
 				      sizeof(struct scoutfs_super_block));
 }
 
-static bool small_bdev(struct super_block *sb, char *which, u64 blocks,
-		       struct block_device *bdev, int shift)
+static bool invalid_blkno_limits(struct super_block *sb, char *which,
+				 u64 start, __le64 first, __le64 last,
+				 struct block_device *bdev, int shift)
 {
-	u64 size = (u64)i_size_read(bdev->bd_inode);
-	u64 count = size >> shift;
+	u64 blkno;
 
-	if (blocks > count) {
-		scoutfs_err(sb, "super block records %llu %s blocks, but device %u:%u size %llu only allows %llu blocks",
-			blocks, which, MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev), size, count);
+	if (le64_to_cpu(first) < start) {
+		scoutfs_err(sb, "super block first %s blkno %llu is within first valid blkno %llu",
+			which, le64_to_cpu(first), start);
+		return true;
+	}
 
+	if (le64_to_cpu(first) > le64_to_cpu(last)) {
+		scoutfs_err(sb, "super block first %s blkno %llu is greater than last %s blkno %llu",
+			which, le64_to_cpu(first), which, le64_to_cpu(last));
+		return true;
+	}
+
+	blkno = (i_size_read(bdev->bd_inode) >> shift) - 1;
+	if (le64_to_cpu(last) > blkno) {
+		scoutfs_err(sb, "super block last %s blkno %llu is beyond device size last blkno %llu",
+			which, le64_to_cpu(last), blkno);
 		return true;
 	}
 
@@ -324,32 +376,27 @@ static int scoutfs_read_super_from_bdev(struct super_block *sb,
 		goto out;
 	}
 
-	if (le64_to_cpu(super->fmt_vers) < SCOUTFS_FORMAT_VERSION_MIN ||
-	    le64_to_cpu(super->fmt_vers) > SCOUTFS_FORMAT_VERSION_MAX) {
-		scoutfs_err(sb, "super block has format version %llu outside of supported version range %u-%u",
-			    le64_to_cpu(super->fmt_vers), SCOUTFS_FORMAT_VERSION_MIN,
-			    SCOUTFS_FORMAT_VERSION_MAX);
-		ret = -EINVAL;
-		goto out;
-	}
 
-	/*
-	 * fill_supers checks the fmt_vers in both supers and then decides to use it.
-	 * From then on we verify that the supers we read have that version.
-	 */
-	if (sbi->fmt_vers != 0 && le64_to_cpu(super->fmt_vers) != sbi->fmt_vers) {
-		scoutfs_err(sb, "super block has format version %llu than %llu read at mount",
-			    le64_to_cpu(super->fmt_vers), sbi->fmt_vers);
+	if (super->version != cpu_to_le64(SCOUTFS_INTEROP_VERSION)) {
+		scoutfs_err(sb, "super block has invalid version %llu, expected %llu",
+			    le64_to_cpu(super->version),
+			    SCOUTFS_INTEROP_VERSION);
 		ret = -EINVAL;
 		goto out;
 	}
 
 	/* XXX do we want more rigorous invalid super checking? */
 
-	if (small_bdev(sb, "metadata", le64_to_cpu(super->total_meta_blocks), sbi->meta_bdev,
-		       SCOUTFS_BLOCK_LG_SHIFT) ||
-	    small_bdev(sb, "data", le64_to_cpu(super->total_data_blocks), sb->s_bdev,
-		       SCOUTFS_BLOCK_SM_SHIFT)) {
+	if (invalid_blkno_limits(sb, "meta",
+			         SCOUTFS_META_DEV_START_BLKNO,
+				 super->first_meta_blkno,
+				 super->last_meta_blkno, sbi->meta_bdev,
+				 SCOUTFS_BLOCK_LG_SHIFT) ||
+	    invalid_blkno_limits(sb, "data",
+			         SCOUTFS_DATA_DEV_START_BLKNO,
+				 super->first_data_blkno,
+				 super->last_data_blkno, sb->s_bdev,
+				 SCOUTFS_BLOCK_SM_SHIFT)) {
 		ret = -EINVAL;
 	}
 
@@ -456,14 +503,7 @@ static int scoutfs_read_supers(struct super_block *sb)
 		goto out;
 	}
 
-	if (le64_to_cpu(meta_super->fmt_vers) != le64_to_cpu(data_super->fmt_vers)) {
-		scoutfs_err(sb, "meta device format version %llu != data device format version %llu",
-			    le64_to_cpu(meta_super->fmt_vers), le64_to_cpu(data_super->fmt_vers));
-		goto out;
-	}
-
-	sbi->fsid = le64_to_cpu(meta_super->hdr.fsid);
-	sbi->fmt_vers = le64_to_cpu(meta_super->fmt_vers);
+	sbi->super = *meta_super;
 out:
 	kfree(meta_super);
 	kfree(data_super);
@@ -472,9 +512,9 @@ out:
 
 static int scoutfs_fill_super(struct super_block *sb, void *data, int silent)
 {
-	struct scoutfs_mount_options opts;
-	struct block_device *meta_bdev;
 	struct scoutfs_sb_info *sbi;
+	struct mount_options opts;
+	struct block_device *meta_bdev;
 	struct inode *inode;
 	int ret;
 
@@ -483,11 +523,7 @@ static int scoutfs_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_magic = SCOUTFS_SUPER_MAGIC;
 	sb->s_maxbytes = MAX_LFS_FILESIZE;
 	sb->s_op = &scoutfs_super_ops;
-	sb->s_d_op = &scoutfs_dentry_ops;
 	sb->s_export_op = &scoutfs_export_ops;
-	sb->s_xattr = scoutfs_xattr_handlers;
-	sb->s_flags |= SB_I_VERSION | SB_POSIXACL;
-	sb->s_time_gran = 1;
 
 	/* btree blocks use long lived bh->b_data refs */
 	mapping_set_gfp_mask(sb->s_bdev->bd_inode->i_mapping, GFP_NOFS);
@@ -500,17 +536,22 @@ static int scoutfs_fill_super(struct super_block *sb, void *data, int silent)
 
 	ret = assign_random_id(sbi);
 	if (ret < 0)
-		goto out;
+		return ret;
 
 	spin_lock_init(&sbi->next_ino_lock);
+	init_waitqueue_head(&sbi->trans_hold_wq);
 	spin_lock_init(&sbi->data_wait_root.lock);
 	sbi->data_wait_root.root = RB_ROOT;
+	spin_lock_init(&sbi->trans_write_lock);
+	INIT_DELAYED_WORK(&sbi->trans_write_work, scoutfs_trans_write_func);
+	init_waitqueue_head(&sbi->trans_write_wq);
+	scoutfs_sysfs_init_attrs(sb, &sbi->mopts_ssa);
 
-	/* parse options early for use during setup */
-	ret = scoutfs_options_early_setup(sb, data);
-	if (ret < 0)
+	ret = scoutfs_parse_options(sb, data, &opts);
+	if (ret)
 		goto out;
-	scoutfs_options_read(sb, &opts);
+
+	sbi->opts = opts;
 
 	ret = sb_set_blocksize(sb, SCOUTFS_BLOCK_SM_SIZE);
 	if (ret != SCOUTFS_BLOCK_SM_SIZE) {
@@ -519,7 +560,9 @@ static int scoutfs_fill_super(struct super_block *sb, void *data, int silent)
 		goto out;
 	}
 
-	meta_bdev = blkdev_get_by_path(opts.metadev_path, SCOUTFS_META_BDEV_MODE, sb);
+	meta_bdev =
+		blkdev_get_by_path(sbi->opts.metadev_path,
+				   SCOUTFS_META_BDEV_MODE, sb);
 	if (IS_ERR(meta_bdev)) {
 		scoutfs_err(sb, "could not open metadev: error %ld",
 			    PTR_ERR(meta_bdev));
@@ -539,32 +582,30 @@ static int scoutfs_fill_super(struct super_block *sb, void *data, int silent)
 	      scoutfs_setup_sysfs(sb) ?:
 	      scoutfs_setup_counters(sb) ?:
 	      scoutfs_options_setup(sb) ?:
+	      scoutfs_sysfs_create_attrs(sb, &sbi->mopts_ssa,
+				mount_options_attrs, "mount_options") ?:
 	      scoutfs_setup_triggers(sb) ?:
-	      scoutfs_fence_setup(sb) ?:
 	      scoutfs_block_setup(sb) ?:
 	      scoutfs_forest_setup(sb) ?:
 	      scoutfs_item_setup(sb) ?:
 	      scoutfs_inode_setup(sb) ?:
 	      scoutfs_data_setup(sb) ?:
 	      scoutfs_setup_trans(sb) ?:
-	      scoutfs_omap_setup(sb) ?:
 	      scoutfs_lock_setup(sb) ?:
 	      scoutfs_net_setup(sb) ?:
-	      scoutfs_recov_setup(sb) ?:
 	      scoutfs_server_setup(sb) ?:
 	      scoutfs_quorum_setup(sb) ?:
 	      scoutfs_client_setup(sb) ?:
-	      scoutfs_volopt_setup(sb) ?:
+	      scoutfs_lock_rid(sb, SCOUTFS_LOCK_WRITE, 0, sbi->rid,
+				   &sbi->rid_lock) ?:
+	      scoutfs_trans_get_log_trees(sb) ?:
 	      scoutfs_srch_setup(sb);
 	if (ret)
 		goto out;
 
-	/* this interruptible iget lets hung mount be aborted with ctl-c */
-	inode = scoutfs_iget(sb, SCOUTFS_ROOT_INO, SCOUTFS_LKF_INTERRUPTIBLE, 0);
+	inode = scoutfs_iget(sb, SCOUTFS_ROOT_INO);
 	if (IS_ERR(inode)) {
 		ret = PTR_ERR(inode);
-		if (ret == -ERESTARTSYS)
-			ret = -EINTR;
 		goto out;
 	}
 
@@ -574,15 +615,12 @@ static int scoutfs_fill_super(struct super_block *sb, void *data, int silent)
 		goto out;
 	}
 
-	/* send requests once iget progress shows we had a server */
-	ret = scoutfs_trans_get_log_trees(sb);
+	ret = scoutfs_client_advance_seq(sb, &sbi->trans_seq);
 	if (ret)
 		goto out;
 
-	/* start up background services that use everything else */
-	scoutfs_inode_start(sb);
-	scoutfs_forest_start(sb);
 	scoutfs_trans_restart_sync_deadline(sb);
+//	scoutfs_scan_orphans(sb);
 	ret = 0;
 out:
 	/* on error, generic_shutdown_super calls put_super if s_root */
@@ -603,18 +641,7 @@ static struct dentry *scoutfs_mount(struct file_system_type *fs_type, int flags,
  */
 static void scoutfs_kill_sb(struct super_block *sb)
 {
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-
-	if (sbi) {
-		sbi->unmounting = true;
-		smp_wmb();
-	}
-
-	if (SCOUTFS_HAS_SBI(sb)) {
-		scoutfs_options_stop(sb);
-		scoutfs_inode_orphan_stop(sb);
-		scoutfs_lock_unmount_begin(sb);
-	}
+	trace_scoutfs_kill_sb(sb);
 
 	kill_block_super(sb);
 }
@@ -632,6 +659,7 @@ MODULE_ALIAS_FS("scoutfs");
 static void teardown_module(void)
 {
 	debugfs_remove(scoutfs_debugfs_root);
+	scoutfs_dir_exit();
 	scoutfs_inode_exit();
 	scoutfs_sysfs_exit();
 }
@@ -646,15 +674,11 @@ static int __init scoutfs_module_init(void)
 	 */
 	__asm__ __volatile__ (
 		".section	.note.git_describe,\"a\"\n"
-		".ascii		\""SCOUTFS_GIT_DESCRIBE"\\n\"\n"
+		".string	\""SCOUTFS_GIT_DESCRIBE"\\n\"\n"
 		".previous\n");
 	__asm__ __volatile__ (
-		".section	.note.scoutfs_format_version_min,\"a\"\n"
-		".ascii		\""SCOUTFS_FORMAT_VERSION_MIN_STR"\\n\"\n"
-		".previous\n");
-	__asm__ __volatile__ (
-		".section	.note.scoutfs_format_version_max,\"a\"\n"
-		".ascii		\""SCOUTFS_FORMAT_VERSION_MAX_STR"\\n\"\n"
+		".section	.note.scoutfs_interop_version,\"a\"\n"
+		".string	\""SCOUTFS_INTEROP_VERSION_STR"\\n\"\n"
 		".previous\n");
 
 	scoutfs_init_counters();
@@ -669,23 +693,23 @@ static int __init scoutfs_module_init(void)
 		goto out;
 	}
 	ret = scoutfs_inode_init() ?:
+	      scoutfs_dir_init() ?:
 	      register_filesystem(&scoutfs_fs_type);
 out:
 	if (ret)
 		teardown_module();
 	return ret;
 }
-module_init(scoutfs_module_init);
+module_init(scoutfs_module_init)
 
 static void __exit scoutfs_module_exit(void)
 {
 	unregister_filesystem(&scoutfs_fs_type);
 	teardown_module();
 }
-module_exit(scoutfs_module_exit);
+module_exit(scoutfs_module_exit)
 
 MODULE_AUTHOR("Zach Brown <zab@versity.com>");
 MODULE_LICENSE("GPL");
 MODULE_INFO(git_describe, SCOUTFS_GIT_DESCRIBE);
-MODULE_INFO(scoutfs_format_version_min, SCOUTFS_FORMAT_VERSION_MIN_STR);
-MODULE_INFO(scoutfs_format_version_max, SCOUTFS_FORMAT_VERSION_MAX_STR);
+MODULE_INFO(scoutfs_interop_version, SCOUTFS_INTEROP_VERSION_STR);

kmod/src/super.h

@@ -26,24 +26,20 @@ struct net_info;
 struct block_info;
 struct forest_info;
 struct srch_info;
-struct recov_info;
-struct omap_info;
-struct volopt_info;
-struct fence_info;
 
 struct scoutfs_sb_info {
 	struct super_block *sb;
 
 	/* assigned once at the start of each mount, read-only */
-	u64 fsid;
 	u64 rid;
-	u64 fmt_vers;
+	struct scoutfs_lock *rid_lock;
+
+	struct scoutfs_super_block super;
 
 	struct block_device *meta_bdev;
 
 	spinlock_t next_ino_lock;
 
-	struct options_info *options_info;
 	struct data_info *data_info;
 	struct inode_sb_info *inode_sb_info;
 	struct btree_info *btree_info;
@@ -52,32 +48,40 @@ struct scoutfs_sb_info {
 	struct block_info *block_info;
 	struct forest_info *forest_info;
 	struct srch_info *srch_info;
-	struct omap_info *omap_info;
-	struct volopt_info *volopt_info;
 	struct item_cache_info *item_cache_info;
-	struct fence_info *fence_info;
+
+	wait_queue_head_t trans_hold_wq;
+	struct task_struct *trans_task;
 
 	/* tracks tasks waiting for data extents */
 	struct scoutfs_data_wait_root data_wait_root;
 
-	/* set as transaction opens with trans holders excluded */
+	spinlock_t trans_write_lock;
+	u64 trans_write_count;
 	u64 trans_seq;
+	int trans_write_ret;
+	struct delayed_work trans_write_work;
+	wait_queue_head_t trans_write_wq;
+	struct workqueue_struct *trans_write_workq;
+	bool trans_deadline_expired;
 
 	struct trans_info *trans_info;
 	struct lock_info *lock_info;
 	struct lock_server_info *lock_server_info;
 	struct client_info *client_info;
 	struct server_info *server_info;
-	struct recov_info *recov_info;
 	struct sysfs_info *sfsinfo;
 
 	struct scoutfs_counters *counters;
 	struct scoutfs_triggers *triggers;
 
+	struct mount_options opts;
+	struct options_sb_info *options;
+	struct scoutfs_sysfs_attrs mopts_ssa;
+
 	struct dentry *debug_root;
 
-	bool forced_unmount;
-	bool unmounting;
+	bool shutdown;
 
 	unsigned long corruption_messages_once[SC_NR_LONGS];
 };
@@ -99,26 +103,6 @@ static inline bool SCOUTFS_IS_META_BDEV(struct scoutfs_super_block *super_block)
 
 #define SCOUTFS_META_BDEV_MODE (FMODE_READ | FMODE_WRITE | FMODE_EXCL)
 
-static inline bool scoutfs_forcing_unmount(struct super_block *sb)
-{
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-
-	return sbi->forced_unmount;
-}
-
-/*
- * True if we're shutting down the system and can be used as a coarse
- * indicator that we can avoid doing some work that no longer makes
- * sense.
- */
-static inline bool scoutfs_unmounting(struct super_block *sb)
-{
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-
-	smp_rmb();
-	return !sbi || sbi->unmounting;
-}
-
 /*
  * A small string embedded in messages that's used to identify a
  * specific mount.  It's the three most significant bytes of the fsid
@@ -134,14 +118,14 @@ static inline bool scoutfs_unmounting(struct super_block *sb)
 	(int)(le64_to_cpu(fsid) >> SCSB_SHIFT),				    \
 	(int)(le64_to_cpu(rid) >> SCSB_SHIFT)
 #define SCSB_ARGS(sb)							    \
-	(int)(SCOUTFS_SB(sb)->fsid >> SCSB_SHIFT),			    \
+	(int)(le64_to_cpu(SCOUTFS_SB(sb)->super.hdr.fsid) >> SCSB_SHIFT),   \
 	(int)(SCOUTFS_SB(sb)->rid >> SCSB_SHIFT)
 #define SCSB_TRACE_FIELDS	\
 	__field(__u64, fsid)	\
 	__field(__u64, rid)
 #define SCSB_TRACE_ASSIGN(sb)						\
 	__entry->fsid = SCOUTFS_HAS_SBI(sb) ?				\
-		        SCOUTFS_SB(sb)->fsid : 0;			\
+			le64_to_cpu(SCOUTFS_SB(sb)->super.hdr.fsid) : 0;\
 	__entry->rid = SCOUTFS_HAS_SBI(sb) ?				\
 		       SCOUTFS_SB(sb)->rid : 0;
 #define SCSB_TRACE_ARGS				\
@@ -156,4 +140,6 @@ int scoutfs_write_super(struct super_block *sb,
 /* to keep this out of the ioctl.h public interface definition */
 long scoutfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 
+__le64 scoutfs_clock_sync_id(void);
+
 #endif

kmod/src/sysfs.c

@@ -37,32 +37,14 @@ struct attr_funcs {
 #define ATTR_FUNCS_RO(_name) \
 	static struct attr_funcs _name##_attr_funcs = __ATTR_RO(_name)
 
-static ssize_t data_device_maj_min_show(struct kobject *kobj, struct attribute *attr, char *buf)
-{
-	struct super_block *sb = KOBJ_TO_SB(kobj, sb_id_kobj);
-
-	return snprintf(buf, PAGE_SIZE, "%u:%u\n",
-			MAJOR(sb->s_bdev->bd_dev), MINOR(sb->s_bdev->bd_dev));
-}
-ATTR_FUNCS_RO(data_device_maj_min);
-
-static ssize_t format_version_show(struct kobject *kobj, struct attribute *attr,
-			 char *buf)
-{
-	struct super_block *sb = KOBJ_TO_SB(kobj, sb_id_kobj);
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-
-	return snprintf(buf, PAGE_SIZE, "%llu\n", sbi->fmt_vers);
-}
-ATTR_FUNCS_RO(format_version);
-
 static ssize_t fsid_show(struct kobject *kobj, struct attribute *attr,
 			 char *buf)
 {
 	struct super_block *sb = KOBJ_TO_SB(kobj, sb_id_kobj);
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
+	struct scoutfs_super_block *super = &SCOUTFS_SB(sb)->super;
 
-	return snprintf(buf, PAGE_SIZE, "%016llx\n", sbi->fsid);
+	return snprintf(buf, PAGE_SIZE, "%016llx\n",
+			le64_to_cpu(super->hdr.fsid));
 }
 ATTR_FUNCS_RO(fsid);
 
@@ -109,8 +91,6 @@ static ssize_t attr_funcs_show(struct kobject *kobj, struct attribute *attr,
 
 
 static struct attribute *sb_id_attrs[] = {
-	&data_device_maj_min_attr_funcs.attr,
-	&format_version_attr_funcs.attr,
 	&fsid_attr_funcs.attr,
 	&rid_attr_funcs.attr,
 	NULL,
@@ -151,10 +131,9 @@ void scoutfs_sysfs_init_attrs(struct super_block *sb,
  *  If this returns success then the file will be visible and show can
  *  be called until unmount.
  */
-int scoutfs_sysfs_create_attrs_parent(struct super_block *sb,
-				      struct kobject *parent,
-				      struct scoutfs_sysfs_attrs *ssa,
-				      struct attribute **attrs, char *fmt, ...)
+int scoutfs_sysfs_create_attrs(struct super_block *sb,
+			       struct scoutfs_sysfs_attrs *ssa,
+			       struct attribute **attrs, char *fmt, ...)
 {
 	va_list args;
 	size_t name_len;
@@ -195,8 +174,8 @@ int scoutfs_sysfs_create_attrs_parent(struct super_block *sb,
 		goto out;
 	}
 
-	ret = kobject_init_and_add(&ssa->kobj, &ssa->ktype, parent,
-				   "%s", ssa->name);
+	ret = kobject_init_and_add(&ssa->kobj, &ssa->ktype,
+				   scoutfs_sysfs_sb_dir(sb), "%s", ssa->name);
 out:
 	if (ret) {
 		kfree(ssa->name);
@@ -267,7 +246,7 @@ int __init scoutfs_sysfs_init(void)
 	return 0;
 }
 
-void scoutfs_sysfs_exit(void)
+void __exit scoutfs_sysfs_exit(void)
 {
 	if (scoutfs_kset)
 		kset_unregister(scoutfs_kset);

kmod/src/sysfs.h

@@ -10,8 +10,6 @@
 
 #define SCOUTFS_ATTR_RO(_name)						\
         static struct kobj_attribute scoutfs_attr_##_name = __ATTR_RO(_name)
-#define SCOUTFS_ATTR_RW(_name)						\
-        static struct kobj_attribute scoutfs_attr_##_name = __ATTR_RW(_name)
 
 #define SCOUTFS_ATTR_PTR(_name)						\
         &scoutfs_attr_##_name.attr
@@ -36,14 +34,9 @@ struct scoutfs_sysfs_attrs {
 
 void scoutfs_sysfs_init_attrs(struct super_block *sb,
 			      struct scoutfs_sysfs_attrs *ssa);
-int scoutfs_sysfs_create_attrs_parent(struct super_block *sb,
-				      struct kobject *parent,
-				      struct scoutfs_sysfs_attrs *ssa,
-				      struct attribute **attrs, char *fmt, ...);
-#define scoutfs_sysfs_create_attrs(sb, ssa, attrs, fmt, args...)	\
-	scoutfs_sysfs_create_attrs_parent(sb, scoutfs_sysfs_sb_dir(sb),	\
-					  ssa, attrs, fmt, ##args)
-
+int scoutfs_sysfs_create_attrs(struct super_block *sb,
+			       struct scoutfs_sysfs_attrs *ssa,
+			       struct attribute **attrs, char *fmt, ...);
 void scoutfs_sysfs_destroy_attrs(struct super_block *sb,
 				 struct scoutfs_sysfs_attrs *ssa);
 
@@ -53,6 +46,6 @@ int scoutfs_setup_sysfs(struct super_block *sb);
 void scoutfs_destroy_sysfs(struct super_block *sb);
 
 int __init scoutfs_sysfs_init(void);
-void scoutfs_sysfs_exit(void);
+void __exit scoutfs_sysfs_exit(void);
 
 #endif

kmod/src/trans.c

@@ -17,7 +17,6 @@
 #include <linux/atomic.h>
 #include <linux/writeback.h>
 #include <linux/slab.h>
-#include <linux/delay.h>
 
 #include "super.h"
 #include "trans.h"
@@ -54,24 +53,15 @@
 /* sync dirty data at least this often */
 #define TRANS_SYNC_DELAY (HZ * 10)
 
+/*
+ * XXX move the rest of the super trans_ fields here.
+ */
 struct trans_info {
-	struct super_block *sb;
-
 	atomic_t holders;
 
 	struct scoutfs_log_trees lt;
 	struct scoutfs_alloc alloc;
 	struct scoutfs_block_writer wri;
-
-	wait_queue_head_t hold_wq;
-	struct task_struct *task;
-	spinlock_t write_lock;
-	u64 write_count;
-	int write_ret;
-	struct delayed_work write_work;
-	wait_queue_head_t write_wq;
-	struct workqueue_struct *write_workq;
-	bool deadline_expired;
 };
 
 #define DECLARE_TRANS_INFO(sb, name) \
@@ -101,7 +91,6 @@ static int commit_btrees(struct super_block *sb)
  */
 int scoutfs_trans_get_log_trees(struct super_block *sb)
 {
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
 	DECLARE_TRANS_INFO(sb, tri);
 	struct scoutfs_log_trees lt;
 	int ret = 0;
@@ -114,11 +103,6 @@ int scoutfs_trans_get_log_trees(struct super_block *sb)
 
 		scoutfs_forest_init_btrees(sb, &tri->alloc, &tri->wri, &lt);
 		scoutfs_data_init_btrees(sb, &tri->alloc, &tri->wri, &lt);
-
-		/* first set during mount from 0 to nonzero allows commits */
-		spin_lock(&tri->write_lock);
-		sbi->trans_seq = le64_to_cpu(lt.get_trans_seq);
-		spin_unlock(&tri->write_lock);
 	}
 	return ret;
 }
@@ -136,12 +120,13 @@ bool scoutfs_trans_has_dirty(struct super_block *sb)
  */
 static void sub_holders_and_wake(struct super_block *sb, int val)
 {
+	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
 	DECLARE_TRANS_INFO(sb, tri);
 
 	atomic_sub(val, &tri->holders);
 	smp_mb(); /* make sure sub is visible before we wake */
-	if (waitqueue_active(&tri->hold_wq))
-		wake_up(&tri->hold_wq);
+	if (waitqueue_active(&sbi->trans_hold_wq))
+		wake_up(&sbi->trans_hold_wq);
 }
 
 /*
@@ -169,93 +154,90 @@ static bool drained_holders(struct trans_info *tri)
  * functions that would try to hold the transaction.  We record the task
  * whose committing the transaction so that holding won't deadlock.
  *
- * Once we clear the write func bit in holders then waiting holders can
- * enter the transaction and continue modifying the transaction.  Once
- * we start writing we consider the transaction done and won't exit,
- * clearing the write func bit, until get_log_trees has opened the next
- * transaction.  The exception is forced unmount which is allowed to
- * generate errors and throw away data.
+ * Any dirty block had to have allocated a new blkno which would have
+ * created dirty allocator metadata blocks.  We can avoid writing
+ * entirely if we don't have any dirty metadata blocks.  This is
+ * important because we don't try to serialize this work during
+ * unmount.. we can execute as the vfs is shutting down.. we need to
+ * decide that nothing is dirty without calling the vfs at all.
  *
- * This means that the only way fsync can return an error is if we're in
- * forced unmount.
+ * We first try to sync the dirty inodes and write their dirty data blocks,
+ * then we write all our dirty metadata blocks, and only when those succeed
+ * do we write the new super that references all of these newly written blocks.
+ *
+ * If there are write errors then blocks are kept dirty in memory and will
+ * be written again at the next sync.
  */
 void scoutfs_trans_write_func(struct work_struct *work)
 {
-	struct trans_info *tri = container_of(work, struct trans_info, write_work.work);
-	struct super_block *sb = tri->sb;
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-	bool retrying = false;
+	struct scoutfs_sb_info *sbi = container_of(work, struct scoutfs_sb_info,
+						   trans_write_work.work);
+	struct super_block *sb = sbi->sb;
+	DECLARE_TRANS_INFO(sb, tri);
+	u64 trans_seq = sbi->trans_seq;
 	char *s = NULL;
 	int ret = 0;
 
-	tri->task = current;
+	sbi->trans_task = current;
 
 	/* mark that we're writing so holders wait for us to finish and clear our bit */
 	atomic_add(TRANS_HOLDERS_WRITE_FUNC_BIT, &tri->holders);
 
-	wait_event(tri->hold_wq, drained_holders(tri));
+	wait_event(sbi->trans_hold_wq, drained_holders(tri));
 
-	/* mount hasn't opened first transaction yet, still complete sync */
-	if (sbi->trans_seq == 0) {
-		ret = 0;
+	trace_scoutfs_trans_write_func(sb,
+			scoutfs_block_writer_dirty_bytes(sb, &tri->wri));
+
+	if (!scoutfs_block_writer_has_dirty(sb, &tri->wri) &&
+	    !scoutfs_item_dirty_pages(sb)) {
+		if (sbi->trans_deadline_expired) {
+			/*
+			 * If we're not writing data then we only advance the
+			 * seq at the sync deadline interval.  This keeps idle
+			 * mounts from pinning a seq and stopping readers of the
+			 * seq indices but doesn't send a message for every sync
+			 * syscall.
+			 */
+			ret = scoutfs_client_advance_seq(sb, &trans_seq);
+			if (ret < 0)
+			      s = "clean advance seq";
+		}
 		goto out;
 	}
 
-	if (scoutfs_forcing_unmount(sb)) {
-		ret = -EIO;
-		goto out;
-	}
-
-	trace_scoutfs_trans_write_func(sb, scoutfs_block_writer_dirty_bytes(sb, &tri->wri),
-				       scoutfs_item_dirty_pages(sb));
-
-	if (tri->deadline_expired)
+	if (sbi->trans_deadline_expired)
 		scoutfs_inc_counter(sb, trans_commit_timer);
 
 	scoutfs_inc_counter(sb, trans_commit_written);
 
-	do {
-		ret = (s = "data submit", scoutfs_inode_walk_writeback(sb, true)) ?:
-		      (s = "item dirty", scoutfs_item_write_dirty(sb))  ?:
-		      (s = "data prepare", scoutfs_data_prepare_commit(sb))  ?:
-		      (s = "alloc prepare", scoutfs_alloc_prepare_commit(sb, &tri->alloc,
-									 &tri->wri))  ?:
-		      (s = "meta write", scoutfs_block_writer_write(sb, &tri->wri))  ?:
-		      (s = "data wait", scoutfs_inode_walk_writeback(sb, false)) ?:
-		      (s = "commit log trees", commit_btrees(sb)) ?:
-		      scoutfs_item_write_done(sb) ?:
-		      (s = "get log trees", scoutfs_trans_get_log_trees(sb));
-		if (ret < 0) {
-			if (!retrying) {
-				scoutfs_warn(sb, "critical transaction commit failure: %s = %d, retrying",
-					    s, ret);
-				retrying = true;
-			}
-
-			if (scoutfs_forcing_unmount(sb)) {
-				ret = -EIO;
-				break;
-			}
-
-			msleep(2 * MSEC_PER_SEC);
-
-		} else if (retrying) {
-			scoutfs_info(sb, "retried transaction commit succeeded");
-		}
-
-	} while (ret < 0);
-
+	/* XXX this all needs serious work for dealing with errors */
+	ret = (s = "data submit", scoutfs_inode_walk_writeback(sb, true)) ?:
+	      (s = "item dirty", scoutfs_item_write_dirty(sb))  ?:
+	      (s = "data prepare", scoutfs_data_prepare_commit(sb))  ?:
+	      (s = "alloc prepare", scoutfs_alloc_prepare_commit(sb,
+						&tri->alloc, &tri->wri))  ?:
+	      (s = "meta write", scoutfs_block_writer_write(sb, &tri->wri))  ?:
+	      (s = "data wait", scoutfs_inode_walk_writeback(sb, false)) ?:
+	      (s = "commit log trees", commit_btrees(sb)) ?:
+	      scoutfs_item_write_done(sb) ?:
+	      (s = "advance seq", scoutfs_client_advance_seq(sb, &trans_seq)) ?:
+	      (s = "get log trees", scoutfs_trans_get_log_trees(sb));
 out:
-	spin_lock(&tri->write_lock);
-	tri->write_count++;
-	tri->write_ret = ret;
-	spin_unlock(&tri->write_lock);
-	wake_up(&tri->write_wq);
+	if (ret < 0)
+		scoutfs_err(sb, "critical transaction commit failure: %s, %d",
+			    s, ret);
+
+	spin_lock(&sbi->trans_write_lock);
+	sbi->trans_write_count++;
+	sbi->trans_write_ret = ret;
+	sbi->trans_seq = trans_seq;
+	spin_unlock(&sbi->trans_write_lock);
+	wake_up(&sbi->trans_write_wq);
 
 	/* we're done, wake waiting holders */
 	sub_holders_and_wake(sb, TRANS_HOLDERS_WRITE_FUNC_BIT);
 
-	tri->task = NULL;
+	sbi->trans_task = NULL;
 
 	scoutfs_trans_restart_sync_deadline(sb);
 }
@@ -266,17 +248,17 @@ struct write_attempt {
 };
 
 /* this is called as a wait_event() condition so it can't change task state */
-static int write_attempted(struct super_block *sb, struct write_attempt *attempt)
+static int write_attempted(struct scoutfs_sb_info *sbi,
+			   struct write_attempt *attempt)
 {
-	DECLARE_TRANS_INFO(sb, tri);
 	int done = 1;
 
-	spin_lock(&tri->write_lock);
-	if (tri->write_count > attempt->count)
-		attempt->ret = tri->write_ret;
+	spin_lock(&sbi->trans_write_lock);
+	if (sbi->trans_write_count > attempt->count)
+		attempt->ret = sbi->trans_write_ret;
 	else
 		done = 0;
-	spin_unlock(&tri->write_lock);
+	spin_unlock(&sbi->trans_write_lock);
 
 	return done;
 }
@@ -286,12 +268,10 @@ static int write_attempted(struct super_block *sb, struct write_attempt *attempt
  * We always have delayed sync work pending but the caller wants it
  * to execute immediately.
  */
-static void queue_trans_work(struct super_block *sb)
+static void queue_trans_work(struct scoutfs_sb_info *sbi)
 {
-	DECLARE_TRANS_INFO(sb, tri);
-
-	tri->deadline_expired = false;
-	mod_delayed_work(tri->write_workq, &tri->write_work, 0);
+	sbi->trans_deadline_expired = false;
+	mod_delayed_work(sbi->trans_write_workq, &sbi->trans_write_work, 0);
 }
 
 /*
@@ -304,24 +284,26 @@ static void queue_trans_work(struct super_block *sb)
  */
 int scoutfs_trans_sync(struct super_block *sb, int wait)
 {
-	DECLARE_TRANS_INFO(sb, tri);
-	struct write_attempt attempt = { .ret = 0 };
+	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
+	struct write_attempt attempt;
 	int ret;
 
 
 	if (!wait) {
-		queue_trans_work(sb);
+		queue_trans_work(sbi);
 		return 0;
 	}
 
-	spin_lock(&tri->write_lock);
-	attempt.count = tri->write_count;
-	spin_unlock(&tri->write_lock);
+	spin_lock(&sbi->trans_write_lock);
+	attempt.count = sbi->trans_write_count;
+	spin_unlock(&sbi->trans_write_lock);
 
-	queue_trans_work(sb);
+	queue_trans_work(sbi);
 
-	wait_event(tri->write_wq, write_attempted(sb, &attempt));
-	ret = attempt.ret;
+	ret = wait_event_interruptible(sbi->trans_write_wq,
+				       write_attempted(sbi, &attempt));
+	if (ret == 0)
+		ret = attempt.ret;
 
 	return ret;
 }
@@ -337,10 +319,10 @@ int scoutfs_file_fsync(struct file *file, loff_t start, loff_t end,
 
 void scoutfs_trans_restart_sync_deadline(struct super_block *sb)
 {
-	DECLARE_TRANS_INFO(sb, tri);
+	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
 
-	tri->deadline_expired = true;
-	mod_delayed_work(tri->write_workq, &tri->write_work,
+	sbi->trans_deadline_expired = true;
+	mod_delayed_work(sbi->trans_write_workq, &sbi->trans_write_work,
 			 TRANS_SYNC_DELAY);
 }
 
@@ -448,8 +430,8 @@ static bool commit_before_hold(struct super_block *sb, struct trans_info *tri)
 		return true;
 	}
 
-	/* if we're low and can't refill then alloc could empty and return enospc */
-	if (scoutfs_data_alloc_should_refill(sb, SCOUTFS_ALLOC_DATA_REFILL_THRESH)) {
+	/* Try to refill data allocator before premature enospc */
+	if (scoutfs_data_alloc_free_bytes(sb) <= SCOUTFS_TRANS_DATA_ALLOC_LWM) {
 		scoutfs_inc_counter(sb, trans_commit_data_alloc_low);
 		return true;
 	}
@@ -457,15 +439,38 @@ static bool commit_before_hold(struct super_block *sb, struct trans_info *tri)
 	return false;
 }
 
-/*
- * called as a wait_event condition, needs to be careful to not change
- * task state and is racing with waking paths that sub_return, test, and
- * wake.
- */
-static bool holders_no_writer(struct trans_info *tri)
+static bool acquired_hold(struct super_block *sb)
 {
-	smp_mb(); /* make sure task in wait_event queue before atomic read */
-	return !(atomic_read(&tri->holders) & TRANS_HOLDERS_WRITE_FUNC_BIT);
+	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
+	DECLARE_TRANS_INFO(sb, tri);
+	bool acquired;
+
+	/* if a caller already has a hold we acquire unconditionally */
+	if (inc_journal_info_holders()) {
+		atomic_inc(&tri->holders);
+		acquired = true;
+		goto out;
+	}
+
+	/* wait if the writer is blocking holds */
+	if (!inc_holders_unless_writer(tri)) {
+		dec_journal_info_holders();
+		acquired = false;
+		goto out;
+	}
+
+	/* wait if we're triggering another commit */
+	if (commit_before_hold(sb, tri)) {
+		release_holders(sb);
+		queue_trans_work(sbi);
+		acquired = false;
+		goto out;
+	}
+
+	trace_scoutfs_trans_acquired_hold(sb, current->journal_info, atomic_read(&tri->holders));
+	acquired = true;
+out:
+	return acquired;
 }
 
 /*
@@ -481,65 +486,15 @@ static bool holders_no_writer(struct trans_info *tri)
  * The writing thread marks itself as a global trans_task which
  * short-circuits all the hold machinery so it can call code that would
  * otherwise try to hold transactions while it is writing.
- *
- * If the caller is adding metadata items that will eventually consume
- * free space -- not dirtying existing items or adding deletion items --
- * then we can return enospc if our metadata allocator indicates that
- * we're low on space.
  */
-int scoutfs_hold_trans(struct super_block *sb, bool allocing)
+int scoutfs_hold_trans(struct super_block *sb)
 {
 	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-	DECLARE_TRANS_INFO(sb, tri);
-	u64 seq;
-	int ret;
 
-	if (current == tri->task)
+	if (current == sbi->trans_task)
 		return 0;
 
-	for (;;) {
-		/* shouldn't get holders until mount finishes, (not locking for cheap test) */
-		if (WARN_ON_ONCE(sbi->trans_seq == 0)) {
-			ret = -EINVAL;
-			break;
-		}
-
-		/* if a caller already has a hold we acquire unconditionally */
-		if (inc_journal_info_holders()) {
-			atomic_inc(&tri->holders);
-			ret = 0;
-			break;
-		}
-
-		/* wait until the writer work is finished */
-		if (!inc_holders_unless_writer(tri)) {
-			dec_journal_info_holders();
-			wait_event(tri->hold_wq, holders_no_writer(tri));
-			continue;
-		}
-
-		/* return enospc if server is into reserved blocks and we're allocating */
-		if (allocing && scoutfs_alloc_test_flag(sb, &tri->alloc, SCOUTFS_ALLOC_FLAG_LOW)) {
-			release_holders(sb);
-			ret = -ENOSPC;
-			break;
-		}
-
-		/* see if we need to trigger and wait for a commit before holding */
-		if (commit_before_hold(sb, tri)) {
-			seq = scoutfs_trans_sample_seq(sb);
-			release_holders(sb);
-			queue_trans_work(sb);
-			wait_event(tri->hold_wq, scoutfs_trans_sample_seq(sb) != seq);
-			continue;
-		}
-
-		ret = 0;
-		break;
-	}
-
-	trace_scoutfs_hold_trans(sb, current->journal_info, atomic_read(&tri->holders), ret);
-	return ret;
+	return wait_event_interruptible(sbi->trans_hold_wq, acquired_hold(sb));
 }
 
 /*
@@ -556,14 +511,15 @@ bool scoutfs_trans_held(void)
 
 void scoutfs_release_trans(struct super_block *sb)
 {
+	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
 	DECLARE_TRANS_INFO(sb, tri);
 
-	if (current == tri->task)
+	if (current == sbi->trans_task)
 		return;
 
 	release_holders(sb);
 
-	trace_scoutfs_release_trans(sb, current->journal_info, atomic_read(&tri->holders), 0);
+	trace_scoutfs_release_trans(sb, current->journal_info, atomic_read(&tri->holders));
 }
 
 /*
@@ -573,13 +529,12 @@ void scoutfs_release_trans(struct super_block *sb)
  */
 u64 scoutfs_trans_sample_seq(struct super_block *sb)
 {
-	DECLARE_TRANS_INFO(sb, tri);
 	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
 	u64 ret;
 
-	spin_lock(&tri->write_lock);
+	spin_lock(&sbi->trans_write_lock);
 	ret = sbi->trans_seq;
-	spin_unlock(&tri->write_lock);
+	spin_unlock(&sbi->trans_write_lock);
 
 	return ret;
 }
@@ -593,17 +548,12 @@ int scoutfs_setup_trans(struct super_block *sb)
 	if (!tri)
 		return -ENOMEM;
 
-	tri->sb = sb;
 	atomic_set(&tri->holders, 0);
 	scoutfs_block_writer_init(sb, &tri->wri);
 
-	spin_lock_init(&tri->write_lock);
-	INIT_DELAYED_WORK(&tri->write_work, scoutfs_trans_write_func);
-	init_waitqueue_head(&tri->write_wq);
-	init_waitqueue_head(&tri->hold_wq);
-
-	tri->write_workq = alloc_workqueue("scoutfs_trans", WQ_UNBOUND, 1);
-	if (!tri->write_workq) {
+	sbi->trans_write_workq = alloc_workqueue("scoutfs_trans",
+						 WQ_UNBOUND, 1);
+	if (!sbi->trans_write_workq) {
 		kfree(tri);
 		return -ENOMEM;
 	}
@@ -614,15 +564,8 @@ int scoutfs_setup_trans(struct super_block *sb)
 }
 
 /*
- * While the vfs will have done an fs level sync before calling
- * put_super, we may have done work down in our level after all the fs
- * ops were done.  An example is final inode deletion in iput, that's
- * done in generic_shutdown_super after the sync and before calling our
- * put_super.
- *
- * So we always try to write any remaining dirty transactions before
- * shutting down.  Typically there won't be any dirty data and the
- * worker will just return.
+ * kill_sb calls sync before getting here so we know that dirty data
+ * should be in flight.  We just have to wait for it to quiesce.
  */
 void scoutfs_shutdown_trans(struct super_block *sb)
 {
@@ -630,19 +573,13 @@ void scoutfs_shutdown_trans(struct super_block *sb)
 	DECLARE_TRANS_INFO(sb, tri);
 
 	if (tri) {
-		if (tri->write_workq) {
-			/* immediately queues pending timer */
-			flush_delayed_work(&tri->write_work);
-			/* prevents re-arming if it has to wait */
-			cancel_delayed_work_sync(&tri->write_work);
-			destroy_workqueue(tri->write_workq);
-			/* trans work schedules after shutdown see null */
-			tri->write_workq = NULL;
-		}
-
-		scoutfs_alloc_prepare_commit(sb, &tri->alloc, &tri->wri);
 		scoutfs_block_writer_forget_all(sb, &tri->wri);
-
+		if (sbi->trans_write_workq) {
+			cancel_delayed_work_sync(&sbi->trans_write_work);
+			destroy_workqueue(sbi->trans_write_workq);
+			/* trans work schedules after shutdown see null */
+			sbi->trans_write_workq = NULL;
+		}
 		kfree(tri);
 		sbi->trans_info = NULL;
 	}

kmod/src/trans.h

@@ -1,13 +1,18 @@
 #ifndef _SCOUTFS_TRANS_H_
 #define _SCOUTFS_TRANS_H_
 
+/* the server will attempt to fill data allocs for each trans */
+#define SCOUTFS_TRANS_DATA_ALLOC_HWM	(2ULL * 1024 * 1024 * 1024)
+/* the client will force commits if data allocators get too low */
+#define SCOUTFS_TRANS_DATA_ALLOC_LWM	(256ULL * 1024 * 1024)
+
 void scoutfs_trans_write_func(struct work_struct *work);
 int scoutfs_trans_sync(struct super_block *sb, int wait);
 int scoutfs_file_fsync(struct file *file, loff_t start, loff_t end,
 		       int datasync);
 void scoutfs_trans_restart_sync_deadline(struct super_block *sb);
 
-int scoutfs_hold_trans(struct super_block *sb, bool allocing);
+int scoutfs_hold_trans(struct super_block *sb);
 bool scoutfs_trans_held(void);
 void scoutfs_release_trans(struct super_block *sb);
 u64 scoutfs_trans_sample_seq(struct super_block *sb);

kmod/src/tseq.c

@@ -46,23 +46,6 @@ static struct scoutfs_tseq_entry *tseq_rb_next(struct scoutfs_tseq_entry *ent)
 	return rb_entry(node, struct scoutfs_tseq_entry, node);
 }
 
-#ifdef KC_RB_TREE_AUGMENTED_COMPUTE_MAX
-static bool tseq_compute_total(struct scoutfs_tseq_entry *ent, bool exit)
-{
-	loff_t total = 1 + tseq_node_total(ent->node.rb_left) +
-		       tseq_node_total(ent->node.rb_right);
-
-	if (exit && ent->total == total)
-		return true;
-
-	ent->total = total;
-	return false;
-}
-
-RB_DECLARE_CALLBACKS(static, tseq_rb_callbacks, struct scoutfs_tseq_entry,
-		     node, total, tseq_compute_total);
-#else
-
 static loff_t tseq_compute_total(struct scoutfs_tseq_entry *ent)
 {
 	return 1 + tseq_node_total(ent->node.rb_left) +
@@ -70,8 +53,7 @@ static loff_t tseq_compute_total(struct scoutfs_tseq_entry *ent)
 }
 
 RB_DECLARE_CALLBACKS(static, tseq_rb_callbacks, struct scoutfs_tseq_entry,
-		     node, loff_t, total, tseq_compute_total);
-#endif
+		     node, loff_t, total, tseq_compute_total)
 
 void scoutfs_tseq_tree_init(struct scoutfs_tseq_tree *tree,
 			    scoutfs_tseq_show_t show)

kmod/src/util.h

@@ -17,15 +17,4 @@ static inline void down_write_two(struct rw_semaphore *a,
 	down_write_nested(b, SINGLE_DEPTH_NESTING);
 }
 
-/*
- * When returning shrinker counts from scan_objects, we should steer
- * clear of the magic SHRINK_STOP and SHRINK_EMPTY values, which are near
- * ~0UL values. Hence, we cap count to ~0L, which is arbitarily high
- * enough to avoid it.
- */
-static inline long shrinker_min_long(long count)
-{
-	return min(count, LONG_MAX);
-}
-
 #endif

kmod/src/volopt.c

@@ -1,188 +0,0 @@
-/*
- * Copyright (C) 2021 Versity Software, Inc.  All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License v2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- */
-#include <linux/kernel.h>
-#include <linux/fs.h>
-#include <linux/slab.h>
-#include <linux/kobject.h>
-#include <linux/sysfs.h>
-
-#include "super.h"
-#include "client.h"
-#include "volopt.h"
-
-/*
- * Volume options are exposed through a sysfs directory.  Getting and
- * setting the values sends rpcs to the server who owns the options in
- * the super block.
- */
-
-struct volopt_info {
-	struct super_block *sb;
-	struct scoutfs_sysfs_attrs ssa;
-};
-
-#define DECLARE_VOLOPT_INFO(sb, name) \
-	struct volopt_info *name = SCOUTFS_SB(sb)->volopt_info
-#define DECLARE_VOLOPT_INFO_KOBJ(kobj, name) \
-	DECLARE_VOLOPT_INFO(SCOUTFS_SYSFS_ATTRS_SB(kobj), name)
-
-/*
- * attribute arrays need to be dense but the options we export could
- * well become sparse over time.  .store and .load are generic and we
- * have a lookup table to map the attributes array indexes to the number
- * and name of the option.
- */
-static struct volopt_nr_name {
-	int nr;
-	char *name;
-} volopt_table[] = {
-	{ SCOUTFS_VOLOPT_DATA_ALLOC_ZONE_BLOCKS_NR, "data_alloc_zone_blocks" },
-};
-
-/* initialized by setup, pointer array is null terminated */
-static struct kobj_attribute volopt_attrs[ARRAY_SIZE(volopt_table)];
-static struct attribute *volopt_attr_ptrs[ARRAY_SIZE(volopt_table) + 1];
-
-static void get_opt_data(struct kobj_attribute *attr, struct scoutfs_volume_options *volopt,
-			 u64 *bit, __le64 **opt)
-{
-	size_t index = attr - &volopt_attrs[0];
-	int nr = volopt_table[index].nr;
-
-	*bit = 1ULL << nr;
-	*opt = &volopt->set_bits + 1 + nr;
-}
-
-static ssize_t volopt_attr_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
-{
-	DECLARE_VOLOPT_INFO_KOBJ(kobj, vinf);
-	struct super_block *sb = vinf->sb;
-	struct scoutfs_volume_options volopt;
-	__le64 *opt;
-	u64 bit;
-	int ret;
-
-	ret = scoutfs_client_get_volopt(sb, &volopt);
-	if (ret < 0)
-		return ret;
-
-	get_opt_data(attr, &volopt, &bit, &opt);
-
-	if (le64_to_cpu(volopt.set_bits) & bit) {
-		return snprintf(buf, PAGE_SIZE, "%llu", le64_to_cpup(opt));
-	} else {
-		buf[0] = '\0';
-		return 0;
-	}
-}
-
-static ssize_t volopt_attr_store(struct kobject *kobj, struct kobj_attribute *attr,
-				 const char *buf, size_t count)
-{
-	DECLARE_VOLOPT_INFO_KOBJ(kobj, vinf);
-	struct super_block *sb = vinf->sb;
-	struct scoutfs_volume_options volopt = {0,};
-	u8 chars[32];
-	__le64 *opt;
-	u64 bit;
-	u64 val;
-	int ret;
-
-	if (count == 0)
-		return 0;
-	if (count > sizeof(chars) - 1)
-		return -ERANGE;
-
-	get_opt_data(attr, &volopt, &bit, &opt);
-
-	if (buf[0] == '\n' || buf[0] == '\r') {
-		volopt.set_bits = cpu_to_le64(bit);
-
-		ret = scoutfs_client_clear_volopt(sb, &volopt);
-	} else {
-		memcpy(chars, buf, count);
-		chars[count] = '\0';
-		ret = kstrtoull(chars, 0, &val);
-		if (ret < 0)
-			return ret;
-
-		volopt.set_bits = cpu_to_le64(bit);
-		*opt = cpu_to_le64(val);
-
-		ret = scoutfs_client_set_volopt(sb, &volopt);
-	}
-
-	if (ret == 0)
-		ret = count;
-	return ret;
-}
-
-/*
- * The volume option sysfs files are slim shims around RPCs so this
- * should be called after the client is setup and before it is torn
- * down.
- */
-int scoutfs_volopt_setup(struct super_block *sb)
-{
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-	struct volopt_info *vinf;
-	int ret;
-	int i;
-
-	/* persistent volume options are always a bitmap u64 then the 64 options */
-	BUILD_BUG_ON(sizeof(struct scoutfs_volume_options) != (1 + 64) * 8);
-
-	vinf = kzalloc(sizeof(struct volopt_info), GFP_KERNEL);
-	if (!vinf) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	scoutfs_sysfs_init_attrs(sb, &vinf->ssa);
-	vinf->sb = sb;
-	sbi->volopt_info = vinf;
-
-	for (i = 0; i < ARRAY_SIZE(volopt_table); i++) {
-		volopt_attrs[i] = (struct kobj_attribute) {
-			.attr = { .name = volopt_table[i].name, .mode = S_IWUSR | S_IRUGO },
-			.show = volopt_attr_show,
-			.store  = volopt_attr_store,
-		};
-		volopt_attr_ptrs[i] = &volopt_attrs[i].attr;
-	}
-
-	BUILD_BUG_ON(ARRAY_SIZE(volopt_table) != ARRAY_SIZE(volopt_attr_ptrs) - 1);
-	volopt_attr_ptrs[i] = NULL;
-
-	ret = scoutfs_sysfs_create_attrs(sb, &vinf->ssa, volopt_attr_ptrs, "volume_options");
-	if (ret < 0)
-		goto out;
-
-out:
-	if (ret)
-		scoutfs_volopt_destroy(sb);
-
-	return ret;
-}
-
-void scoutfs_volopt_destroy(struct super_block *sb)
-{
-	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
-	struct volopt_info *vinf = SCOUTFS_SB(sb)->volopt_info;
-
-	if (vinf) {
-		scoutfs_sysfs_destroy_attrs(sb, &vinf->ssa);
-		kfree(vinf);
-		sbi->volopt_info = NULL;
-	}
-}

kmod/src/volopt.h

@@ -1,7 +0,0 @@
-#ifndef _SCOUTFS_VOLOPT_H_
-#define _SCOUTFS_VOLOPT_H_
-
-int scoutfs_volopt_setup(struct super_block *sb);
-void scoutfs_volopt_destroy(struct super_block *sb);
-
-#endif

kmod/src/xattr.h

@@ -1,33 +1,25 @@
 #ifndef _SCOUTFS_XATTR_H_
 #define _SCOUTFS_XATTR_H_
 
-struct scoutfs_xattr_prefix_tags {
-	unsigned long hide:1,
-		      srch:1,
-		      totl:1;
-};
-
-extern const struct xattr_handler *scoutfs_xattr_handlers[];
-
-int scoutfs_xattr_get_locked(struct inode *inode, const char *name, void *buffer, size_t size,
-			     struct scoutfs_lock *lck);
-int scoutfs_xattr_set_locked(struct inode *inode, const char *name, size_t name_len,
-			     const void *value, size_t size, int flags,
-			     const struct scoutfs_xattr_prefix_tags *tgs,
-			     struct scoutfs_lock *lck, struct scoutfs_lock *totl_lock,
-			     struct list_head *ind_locks);
-
+ssize_t scoutfs_getxattr(struct dentry *dentry, const char *name, void *buffer,
+			 size_t size);
+int scoutfs_setxattr(struct dentry *dentry, const char *name,
+		     const void *value, size_t size, int flags);
+int scoutfs_removexattr(struct dentry *dentry, const char *name);
 ssize_t scoutfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
 ssize_t scoutfs_list_xattrs(struct inode *inode, char *buffer,
 			    size_t size, __u32 *hash_pos, __u64 *id_pos,
 			    bool e_range, bool show_hidden);
+
 int scoutfs_xattr_drop(struct super_block *sb, u64 ino,
 		       struct scoutfs_lock *lock);
 
+struct scoutfs_xattr_prefix_tags {
+	unsigned long hide:1,
+		      srch:1;
+};
+
 int scoutfs_xattr_parse_tags(const char *name, unsigned int name_len,
 			     struct scoutfs_xattr_prefix_tags *tgs);
 
-void scoutfs_xattr_init_totl_key(struct scoutfs_key *key, u64 *name);
-int scoutfs_xattr_combine_totl(void *dst, int dst_len, void *src, int src_len);
-
 #endif

tests/.gitignore

@@ -1,11 +1,6 @@
 src/*.d
 src/createmany
-src/dumb_renameat2
 src/dumb_setxattr
 src/handle_cat
-src/handle_fsetxattr
 src/bulk_create_paths
 src/find_xattrs
-src/stage_tmpfile
-src/create_xattr_loop
-src/o_tmpfile_umask

tests/Makefile

@@ -1,18 +1,12 @@
-CFLAGS := -Wall -O2 -Werror -D_FILE_OFFSET_BITS=64 -fno-strict-aliasing -I ../kmod/src
+CFLAGS := -Wall -O2 -Werror -D_FILE_OFFSET_BITS=64 -fno-strict-aliasing 
 SHELL := /usr/bin/bash
 
 # each binary command is built from a single .c file
 BIN := src/createmany			\
-	src/dumb_renameat2		\
 	src/dumb_setxattr		\
 	src/handle_cat			\
-	src/handle_fsetxattr		\
 	src/bulk_create_paths		\
-	src/stage_tmpfile		\
-	src/find_xattrs			\
-	src/create_xattr_loop		\
-	src/fragmented_data_extents	\
-	src/o_tmpfile_umask
+	src/find_xattrs
 
 DEPS := $(wildcard src/*.d)
 

tests/fenced-local-force-unmount.sh

@@ -1,43 +0,0 @@
-#!/usr/bin/bash
-
-#
-# This fencing script is used for testing clusters of multiple mounts on
-# a single host.  It finds mounts to fence by looking for their rids and
-# only knows how to "fence" by using forced unmount.
-#
-
-echo "$0 running rid '$SCOUTFS_FENCED_REQ_RID' ip '$SCOUTFS_FENCED_REQ_IP' args '$@'"
-
-log() {
-	echo "$@" > /dev/stderr
-	exit 1
-}
-
-echo_fail() {
-	echo "$@" > /dev/stderr
-	exit 1
-}
-
-rid="$SCOUTFS_FENCED_REQ_RID"
-
-for fs in /sys/fs/scoutfs/*; do
-	[ ! -d "$fs" ] && continue
-
-	fs_rid="$(cat $fs/rid)" || \
-		echo_fail "failed to get rid in $fs"
-	if [ "$fs_rid" != "$rid" ]; then
-		continue
-	fi
-
-	nr="$(cat $fs/data_device_maj_min)" || \
-		echo_fail "failed to get data device major:minor in $fs"
-
-	mnts=$(findmnt -l -n -t scoutfs -o TARGET -S $nr) || \
-		echo_fail "findmnt -t scoutfs -S $nr failed"
-	for mnt in $mnts; do
-		umount -f "$mnt" || \
-			echo_fail "umout -f $mnt failed"
-	done
-done
-
-exit 0

tests/funcs/exec.sh

@@ -35,22 +35,10 @@ t_fail()
 t_quiet()
 {
 	echo "# $*" >> "$T_TMPDIR/quiet.log"
-	"$@" >> "$T_TMPDIR/quiet.log" 2>&1 || \
+	"$@" > "$T_TMPDIR/quiet.log" 2>&1 || \
 		t_fail "quiet command failed"
 }
 
-#
-# Quietly run a command during a test.  The output is logged but only
-# the return code is printed, presumably because the output contains
-# a lot of invocation specific text that is difficult to filter.
-#
-t_rc()
-{
-	echo "# $*" >> "$T_TMP.rc.log"
-	"$@" >> "$T_TMP.rc.log" 2>&1
-	echo "rc: $?"
-}
-
 #
 # redirect test output back to the output of the invoking script intead
 # of the compared output.

tests/funcs/filter.sh

@@ -18,7 +18,6 @@ t_filter_dmesg()
 
 	# the kernel can just be noisy
 	re=" used greatest stack depth: "
-	re="$re|sched: RT throttling activated"
 
 	# mkfs/mount checks partition tables
 	re="$re|unknown partition table"
@@ -41,7 +40,7 @@ t_filter_dmesg()
 	# mount and unmount spew a bunch
 	re="$re|scoutfs.*client connected"
 	re="$re|scoutfs.*client disconnected"
-	re="$re|scoutfs.*server starting"
+	re="$re|scoutfs.*server setting up"
 	re="$re|scoutfs.*server ready"
 	re="$re|scoutfs.*server accepted"
 	re="$re|scoutfs.*server closing"
@@ -53,43 +52,15 @@ t_filter_dmesg()
 
 	# tests that drop unmount io triggers fencing
 	re="$re|scoutfs .* error: fencing "
-	re="$re|scoutfs .*: waiting for .* clients"
-	re="$re|scoutfs .*: all clients recovered"
+	re="$re|scoutfs .*: waiting for .* lock clients"
+	re="$re|scoutfs .*: all lock clients recovered"
 	re="$re|scoutfs .* error: client rid.*lock recovery timed out"
 
-	# we test bad devices and options
+	# some tests mount w/o options
 	re="$re|scoutfs .* error: Required mount option \"metadev_path\" not found"
-	re="$re|scoutfs .* error: meta_super META flag not set"
-	re="$re|scoutfs .* error: could not open metadev:.*"
-	re="$re|scoutfs .* error: Unknown or malformed option,.*"
-	re="$re|scoutfs .* error: invalid quorum_heartbeat_timeout_ms value"
 
 	# in debugging kernels we can slow things down a bit
 	re="$re|hrtimer: interrupt took .*"
 
-	# fencing tests force unmounts and trigger timeouts
-	re="$re|scoutfs .* forcing unmount"
-	re="$re|scoutfs .* reconnect timed out"
-	re="$re|scoutfs .* recovery timeout expired"
-	re="$re|scoutfs .* fencing previous leader"
-	re="$re|scoutfs .* reclaimed resources"
-	re="$re|scoutfs .* quorum .* error"
-	re="$re|scoutfs .* error reading quorum block"
-	re="$re|scoutfs .* error .* writing quorum block"
-	re="$re|scoutfs .* error .* while checking to delete inode"
-	re="$re|scoutfs .* error .*writing btree blocks.*"
-	re="$re|scoutfs .* error .*writing super block.*"
-	re="$re|scoutfs .* error .* freeing merged btree blocks.*.looping commit del.*upd freeing item"
-	re="$re|scoutfs .* error .* freeing merged btree blocks.*.final commit del.upd freeing item"
-	re="$re|scoutfs .* error .*reading quorum block.*to update event.*"
-	re="$re|scoutfs .* error.*server failed to bind to.*"
-	re="$re|scoutfs .* critical transaction commit failure.*"
-
-	# change-devices causes loop device resizing
-	re="$re|loop[0-9].* detected capacity change from.*"
-
-	# ignore systemd-journal rotating
-	re="$re|systemd-journald.*"
-
 	egrep -v "($re)" 
 }

tests/funcs/fs.sh

@@ -17,17 +17,6 @@ t_sync_seq_index()
 	t_quiet sync
 }
 
-t_mount_rid()
-{
-	local nr="${1:-0}"
-	local mnt="$(eval echo \$T_M$nr)"
-	local rid
-
-	rid=$(scoutfs statfs -s rid -p "$mnt")
-
-	echo "$rid"
-}
-
 #
 # Output the "f.$fsid.r.$rid" identifier string for the given mount
 # number, 0 is used by default if none is specified. 
@@ -75,29 +64,6 @@ t_fs_nrs()
 	seq 0 $((T_NR_MOUNTS - 1))
 }
 
-#
-# output the fs nrs of quorum nodes, we "know" that
-# the quorum nrs are the first consequtive nrs
-#
-t_quorum_nrs()
-{
-	seq 0 $((T_QUORUM - 1))
-}
-
-#
-# outputs "1" if the fs number has "1" in its quorum/is_leader file.
-# All other cases output 0, including the fs nr being a client which
-# won't have a quorum/ dir.
-#
-t_fs_is_leader()
-{
-	if [ "$(cat $(t_sysfs_path $i)/quorum/is_leader 2>/dev/null)" == "1" ]; then
-		echo "1"
-	else
-		echo "0"
-	fi
-}
-
 #
 # Output the mount nr of the current server.  This takes no steps to
 # ensure that the server doesn't shut down and have some other mount
@@ -106,7 +72,7 @@ t_fs_is_leader()
 t_server_nr()
 {
 	for i in $(t_fs_nrs); do
-		if [ "$(t_fs_is_leader $i)" == "1" ]; then
+		if [ "$(cat $(t_sysfs_path $i)/quorum/is_leader)" == "1" ]; then
 			echo $i
 			return
 		fi
@@ -124,7 +90,7 @@ t_server_nr()
 t_first_client_nr()
 {
 	for i in $(t_fs_nrs); do
-		if [ "$(t_fs_is_leader $i)" == "0" ]; then
+		if [ "$(cat $(t_sysfs_path $i)/quorum/is_leader)" == "0" ]; then
 			echo $i
 			return
 		fi
@@ -153,27 +119,7 @@ t_mount()
 	test "$nr" -lt "$T_NR_MOUNTS" || \
 		t_fail "fs nr $nr invalid"
 
-	eval t_quiet mount -t scoutfs \$T_O$nr\$opt \$T_DB$nr \$T_M$nr
-}
-
-#
-# Mount with an optional mount option string.  If the string is empty
-# then the saved mount options are used.  If the string has contents
-# then it is appended to the end of the saved options with a separating
-# comma.
-#
-# Unlike t_mount this won't inherently fail in t_quiet, errors are
-# returned so bad options can be tested.
-#
-t_mount_opt()
-{
-	local nr="$1"
-	local opt="${2:+,$2}"
-
-	test "$nr" -lt "$T_NR_MOUNTS" || \
-		t_fail "fs nr $nr invalid"
-
-	eval mount -t scoutfs \$T_O$nr\$opt \$T_DB$nr \$T_M$nr
+	eval t_quiet mount -t scoutfs \$T_O$nr \$T_DB$nr \$T_M$nr
 }
 
 t_umount()
@@ -183,17 +129,7 @@ t_umount()
 	test "$nr" -lt "$T_NR_MOUNTS" || \
 		t_fail "fs nr $nr invalid"
 
-	eval t_quiet umount \$T_M$nr
-}
-
-t_force_umount()
-{
-	local nr="$1"
-
-	test "$nr" -lt "$T_NR_MOUNTS" || \
-		t_fail "fs nr $nr invalid"
-
-	eval t_quiet umount -f \$T_M$nr
+	eval t_quiet umount \$T_M$i
 }
 
 #
@@ -341,121 +277,3 @@ t_counter_diff_changed() {
 		echo "counter $which didn't change" ||
 		echo "counter $which changed"
 }
-
-#
-# See if we can find a local mount with the caller's rid.
-#
-t_rid_is_mounted() {
-	local rid="$1"
-	local fr="$1"
-
-	for fr in /sys/fs/scoutfs/*; do
-		if [ "$(cat $fr/rid)" == "$rid" ]; then
-			return 0
-		fi
-	done
-
-	return 1
-}
-
-#
-# A given mount is being fenced if any mount has a fence request pending
-# for it which hasn't finished and been removed.
-#
-t_rid_is_fencing() {
-	local rid="$1"
-	local fr
-
-	for fr in /sys/fs/scoutfs/*; do
-		if [ -d "$fr/fence/$rid" ]; then
-			return 0
-		fi
-	done
-
-	return 1
-}
-
-#
-# Wait until the mount identified by the first rid arg is not in any
-# states specified by the remaining state description word args.
-#
-t_wait_if_rid_is() {
-	local rid="$1"
-
-	while ( [[ $* =~ mounted ]] && t_rid_is_mounted $rid ) ||
-	      ( [[ $* =~ fencing ]] && t_rid_is_fencing $rid ) ; do
-		sleep .5
-	done
-}
-
-#
-# Wait until any mount identifies itself as the elected leader.  We can
-# be waiting while tests mount and unmount so mounts may not be mounted
-# at the test's expected mount points.
-#
-t_wait_for_leader() {
-	local i
-
-	while sleep .25; do
-		for i in $(t_fs_nrs); do
-			local ldr="$(t_sysfs_path $i 2>/dev/null)/quorum/is_leader"
-			if [ "$(cat $ldr 2>/dev/null)" == "1" ]; then
-				return
-			fi
-		done
-	done
-}
-
-t_get_sysfs_mount_option() {
-	local nr="$1"
-	local name="$2"
-	local opt="$(t_sysfs_path $nr)/mount_options/$name"
-
-	cat "$opt"
-}
-
-t_set_sysfs_mount_option() {
-	local nr="$1"
-	local name="$2"
-	local val="$3"
-	local opt="$(t_sysfs_path $nr)/mount_options/$name"
-
-	echo "$val" > "$opt" 2>/dev/null
-}
-
-t_set_all_sysfs_mount_options() {
-	local name="$1"
-	local val="$2"
-	local i
-
-	for i in $(t_fs_nrs); do
-		t_set_sysfs_mount_option $i $name $val
-	done
-}
-
-declare -A _saved_opts
-t_save_all_sysfs_mount_options() {
-	local name="$1"
-	local ind
-	local opt
-	local i
-
-	for i in $(t_fs_nrs); do
-		opt="$(t_sysfs_path $i)/mount_options/$name"
-		ind="${name}_${i}"
-
-		_saved_opts[$ind]="$(cat $opt)"
-	done
-}
-
-t_restore_all_sysfs_mount_options() {
-	local name="$1"
-	local ind
-	local i
-
-	for i in $(t_fs_nrs); do
-		ind="${name}_${i}"
-
-		t_set_sysfs_mount_option $i $name "${_saved_opts[$ind]}"
-	done
-}

tests/golden/basic-bad-mounts

@@ -1,6 +0,0 @@
-== prepare devices, mount point, and logs
-== bad devices, bad options
-== swapped devices
-== both meta devices
-== both data devices
-== good volume, bad option and good options

tests/golden/basic-posix-consistency

@@ -47,12 +47,9 @@ four
 --- dir within dir
 --- overwrite file
 --- can't overwrite non-empty dir
-mv: cannot move '/mnt/test/test/basic-posix-consistency/dir/c/clobber' to '/mnt/test/test/basic-posix-consistency/dir/a/dir': Directory not empty
+mv: cannot move ‘/mnt/test/test/basic-posix-consistency/dir/c/clobber’ to ‘/mnt/test/test/basic-posix-consistency/dir/a/dir’: Directory not empty
 --- can overwrite empty dir
---- can rename into root
 == path resoluion
 == inode indexes match after syncing existing
 == inode indexes match after copying and syncing
 == inode indexes match after removing and syncing
-== concurrent creates make one file
-one-file

tests/golden/basic-truncate

@@ -1,6 +0,0 @@
-== truncate writes zeroed partial end of file block
-0000000 0a79 0a79 0a79 0a79 0a79 0a79 0a79 0a79
-*
-0006144 0000 0000 0000 0000 0000 0000 0000 0000
-*
-0012288

tests/golden/block-stale-reads

@@ -1,2 +1,52 @@
-== Issue scoutfs df to force block reads to trigger stale invalidation/retry
+== create shared test file
+== set and get xattrs between mount pairs while retrying
+# file: /mnt/test/test/block-stale-reads/file
+user.xat="1"
+
+counter block_cache_remove_stale changed
+counter block_cache_remove_stale changed
+# file: /mnt/test/test/block-stale-reads/file
+user.xat="2"
+
+counter block_cache_remove_stale changed
+counter block_cache_remove_stale changed
+# file: /mnt/test/test/block-stale-reads/file
+user.xat="3"
+
+counter block_cache_remove_stale changed
+counter block_cache_remove_stale changed
+# file: /mnt/test/test/block-stale-reads/file
+user.xat="4"
+
+counter block_cache_remove_stale changed
+counter block_cache_remove_stale changed
+# file: /mnt/test/test/block-stale-reads/file
+user.xat="5"
+
+counter block_cache_remove_stale changed
+counter block_cache_remove_stale changed
+# file: /mnt/test/test/block-stale-reads/file
+user.xat="6"
+
+counter block_cache_remove_stale changed
+counter block_cache_remove_stale changed
+# file: /mnt/test/test/block-stale-reads/file
+user.xat="7"
+
+counter block_cache_remove_stale changed
+counter block_cache_remove_stale changed
+# file: /mnt/test/test/block-stale-reads/file
+user.xat="8"
+
+counter block_cache_remove_stale changed
+counter block_cache_remove_stale changed
+# file: /mnt/test/test/block-stale-reads/file
+user.xat="9"
+
+counter block_cache_remove_stale changed
+counter block_cache_remove_stale changed
+# file: /mnt/test/test/block-stale-reads/file
+user.xat="10"
+
+counter block_cache_remove_stale changed
 counter block_cache_remove_stale changed

tests/golden/change-devices

@@ -1,27 +0,0 @@
-== make tmp sparse data dev files
-== make scratch fs
-== small new data device fails
-rc: 1
-== check sees data device errors
-rc: 1
-rc: 0
-== preparing while mounted fails
-rc: 1
-== preparing without recovery fails
-rc: 1
-== check sees metadata errors
-rc: 1
-rc: 1
-== preparing with file data fails
-rc: 1
-== preparing after emptied
-rc: 0
-== checks pass
-rc: 0
-rc: 0
-== using prepared
-== preparing larger and resizing
-rc: 0
-equal_prepared
-large_prepared
-resized larger test rc: 0

tests/golden/client-unmount-recovery

@@ -1 +0,0 @@
-== 60s of unmounting non-quorum clients during recovery

tests/golden/data-prealloc

@@ -1,330 +0,0 @@
-== initial writes smaller than prealloc grow to prealloc size
-/mnt/test/test/data-prealloc/file-1: 7 extents found
-/mnt/test/test/data-prealloc/file-2: 7 extents found
-== larger files get full prealloc extents
-/mnt/test/test/data-prealloc/file-1: 9 extents found
-/mnt/test/test/data-prealloc/file-2: 9 extents found
-== non-streaming writes with contig have per-block extents
-/mnt/test/test/data-prealloc/file-1: 32 extents found
-/mnt/test/test/data-prealloc/file-2: 32 extents found
-== any writes to region prealloc get full extents
-/mnt/test/test/data-prealloc/file-1: 4 extents found
-/mnt/test/test/data-prealloc/file-2: 4 extents found
-/mnt/test/test/data-prealloc/file-1: 4 extents found
-/mnt/test/test/data-prealloc/file-2: 4 extents found
-== streaming offline writes get full extents either way
-/mnt/test/test/data-prealloc/file-1: 4 extents found
-/mnt/test/test/data-prealloc/file-2: 4 extents found
-/mnt/test/test/data-prealloc/file-1: 4 extents found
-/mnt/test/test/data-prealloc/file-2: 4 extents found
-== goofy preallocation amounts work
-/mnt/test/test/data-prealloc/file-1: 5 extents found
-/mnt/test/test/data-prealloc/file-2: 5 extents found
-/mnt/test/test/data-prealloc/file-1: 5 extents found
-/mnt/test/test/data-prealloc/file-2: 5 extents found
-/mnt/test/test/data-prealloc/file-1: 3 extents found
-/mnt/test/test/data-prealloc/file-2: 3 extents found
-== block writes into region allocs hole
-wrote blk 24
-wrote blk 32
-wrote blk 40
-wrote blk 55
-wrote blk 63
-wrote blk 71
-wrote blk 72
-wrote blk 79
-wrote blk 80
-wrote blk 87
-wrote blk 88
-wrote blk 95
-before:
-24.. 1: 
-32.. 1: 
-40.. 1: 
-55.. 1: 
-63.. 1: 
-71.. 2: 
-79.. 2: 
-87.. 2: 
-95.. 1: eof
-writing into existing 0 at pos 0
-wrote blk 0
-0.. 1: 
-1.. 7: unwritten
-24.. 1: 
-32.. 1: 
-40.. 1: 
-55.. 1: 
-63.. 1: 
-71.. 2: 
-79.. 2: 
-87.. 2: 
-95.. 1: eof
-writing into existing 0 at pos 1
-wrote blk 15
-0.. 1: 
-1.. 14: unwritten
-15.. 1: 
-24.. 1: 
-32.. 1: 
-40.. 1: 
-55.. 1: 
-63.. 1: 
-71.. 2: 
-79.. 2: 
-87.. 2: 
-95.. 1: eof
-writing into existing 0 at pos 2
-wrote blk 19
-0.. 1: 
-1.. 14: unwritten
-15.. 1: 
-16.. 3: unwritten
-19.. 1: 
-20.. 4: unwritten
-24.. 1: 
-32.. 1: 
-40.. 1: 
-55.. 1: 
-63.. 1: 
-71.. 2: 
-79.. 2: 
-87.. 2: 
-95.. 1: eof
-writing into existing 1 at pos 0
-wrote blk 25
-0.. 1: 
-1.. 14: unwritten
-15.. 1: 
-16.. 3: unwritten
-19.. 1: 
-20.. 4: unwritten
-24.. 1: 
-25.. 1: 
-26.. 6: unwritten
-32.. 1: 
-40.. 1: 
-55.. 1: 
-63.. 1: 
-71.. 2: 
-79.. 2: 
-87.. 2: 
-95.. 1: eof
-writing into existing 1 at pos 1
-wrote blk 39
-0.. 1: 
-1.. 14: unwritten
-15.. 1: 
-16.. 3: unwritten
-19.. 1: 
-20.. 4: unwritten
-24.. 1: 
-25.. 1: 
-26.. 6: unwritten
-32.. 1: 
-39.. 1: 
-40.. 1: 
-55.. 1: 
-63.. 1: 
-71.. 2: 
-79.. 2: 
-87.. 2: 
-95.. 1: eof
-writing into existing 1 at pos 2
-wrote blk 44
-0.. 1: 
-1.. 14: unwritten
-15.. 1: 
-16.. 3: unwritten
-19.. 1: 
-20.. 4: unwritten
-24.. 1: 
-25.. 1: 
-26.. 6: unwritten
-32.. 1: 
-39.. 1: 
-40.. 1: 
-44.. 1: 
-45.. 3: unwritten
-55.. 1: 
-63.. 1: 
-71.. 2: 
-79.. 2: 
-87.. 2: 
-95.. 1: eof
-writing into existing 2 at pos 0
-wrote blk 48
-0.. 1: 
-1.. 14: unwritten
-15.. 1: 
-16.. 3: unwritten
-19.. 1: 
-20.. 4: unwritten
-24.. 1: 
-25.. 1: 
-26.. 6: unwritten
-32.. 1: 
-39.. 1: 
-40.. 1: 
-44.. 1: 
-45.. 3: unwritten
-48.. 1: 
-49.. 6: unwritten
-55.. 1: 
-63.. 1: 
-71.. 2: 
-79.. 2: 
-87.. 2: 
-95.. 1: eof
-writing into existing 2 at pos 1
-wrote blk 62
-0.. 1: 
-1.. 14: unwritten
-15.. 1: 
-16.. 3: unwritten
-19.. 1: 
-20.. 4: unwritten
-24.. 1: 
-25.. 1: 
-26.. 6: unwritten
-32.. 1: 
-39.. 1: 
-40.. 1: 
-44.. 1: 
-45.. 3: unwritten
-48.. 1: 
-49.. 6: unwritten
-55.. 1: 
-56.. 6: unwritten
-62.. 1: 
-63.. 1: 
-71.. 2: 
-79.. 2: 
-87.. 2: 
-95.. 1: eof
-writing into existing 2 at pos 2
-wrote blk 67
-0.. 1: 
-1.. 14: unwritten
-15.. 1: 
-16.. 3: unwritten
-19.. 1: 
-20.. 4: unwritten
-24.. 1: 
-25.. 1: 
-26.. 6: unwritten
-32.. 1: 
-39.. 1: 
-40.. 1: 
-44.. 1: 
-45.. 3: unwritten
-48.. 1: 
-49.. 6: unwritten
-55.. 1: 
-56.. 6: unwritten
-62.. 1: 
-63.. 1: 
-64.. 3: unwritten
-67.. 1: 
-68.. 3: unwritten
-71.. 2: 
-79.. 2: 
-87.. 2: 
-95.. 1: eof
-writing into existing 3 at pos 0
-wrote blk 73
-0.. 1: 
-1.. 14: unwritten
-15.. 1: 
-16.. 3: unwritten
-19.. 1: 
-20.. 4: unwritten
-24.. 1: 
-25.. 1: 
-26.. 6: unwritten
-32.. 1: 
-39.. 1: 
-40.. 1: 
-44.. 1: 
-45.. 3: unwritten
-48.. 1: 
-49.. 6: unwritten
-55.. 1: 
-56.. 6: unwritten
-62.. 1: 
-63.. 1: 
-64.. 3: unwritten
-67.. 1: 
-68.. 3: unwritten
-71.. 2: 
-73.. 1: 
-74.. 5: unwritten
-79.. 2: 
-87.. 2: 
-95.. 1: eof
-writing into existing 3 at pos 1
-wrote blk 86
-0.. 1: 
-1.. 14: unwritten
-15.. 1: 
-16.. 3: unwritten
-19.. 1: 
-20.. 4: unwritten
-24.. 1: 
-25.. 1: 
-26.. 6: unwritten
-32.. 1: 
-39.. 1: 
-40.. 1: 
-44.. 1: 
-45.. 3: unwritten
-48.. 1: 
-49.. 6: unwritten
-55.. 1: 
-56.. 6: unwritten
-62.. 1: 
-63.. 1: 
-64.. 3: unwritten
-67.. 1: 
-68.. 3: unwritten
-71.. 2: 
-73.. 1: 
-74.. 5: unwritten
-79.. 2: 
-86.. 1: 
-87.. 2: 
-95.. 1: eof
-writing into existing 3 at pos 2
-wrote blk 92
-0.. 1: 
-1.. 14: unwritten
-15.. 1: 
-16.. 3: unwritten
-19.. 1: 
-20.. 4: unwritten
-24.. 1: 
-25.. 1: 
-26.. 6: unwritten
-32.. 1: 
-39.. 1: 
-40.. 1: 
-44.. 1: 
-45.. 3: unwritten
-48.. 1: 
-49.. 6: unwritten
-55.. 1: 
-56.. 6: unwritten
-62.. 1: 
-63.. 1: 
-64.. 3: unwritten
-67.. 1: 
-68.. 3: unwritten
-71.. 2: 
-73.. 1: 
-74.. 5: unwritten
-79.. 2: 
-86.. 1: 
-87.. 2: 
-92.. 1: 
-93.. 2: unwritten
-95.. 1: eof

tests/golden/enospc

@@ -1,8 +0,0 @@
-== prepare directories and files
-== fallocate until enospc
-== remove all the files and verify free data blocks
-== make small meta fs
-== create large xattrs until we fill up metadata
-== remove files with xattrs after enospc
-== make sure we can create again
-== cleanup small meta fs

tests/golden/fallocate

@@ -1,3 +0,0 @@
-== creating reasonably large per-mount files
-== 10s of racing cold reads and fallocate nop
-== cleaning up files

tests/golden/fence-and-reclaim

@@ -1,5 +0,0 @@
-== make sure all mounts can see each other
-== force unmount one client, connection timeout, fence nop, mount
-== force unmount all non-server, connection timeout, fence nop, mount
-== force unmount server, quorum elects new leader, fence nop, mount
-== force unmount everything, new server fences all previous

tests/golden/get-referring-entries

@@ -1,18 +0,0 @@
-== root inode returns nothing
-== crazy large unused inode does nothing
-== basic entry
-file
-== rename
-renamed
-== hard link
-file
-link
-== removal
-== different dirs
-== file types
-type b name block
-type c name char
-type d name dir
-type f name file
-type l name symlink
-== all name lengths work

tests/golden/inode-deletion

@@ -1,27 +0,0 @@
-== basic unlink deletes
-ino found in dseq index
-ino not found in dseq index
-== local open-unlink waits for close to delete
-contents after rm: contents
-ino found in dseq index
-ino not found in dseq index
-== multiple local opens are protected
-contents after rm 1: contents
-contents after rm 2: contents
-ino found in dseq index
-ino not found in dseq index
-== remote unopened unlink deletes
-ino not found in dseq index
-ino not found in dseq index
-== unlink wait for open on other mount
-mount 0 contents after mount 1 rm: contents
-ino found in dseq index
-ino found in dseq index
-stat: cannot stat '/mnt/test/test/inode-deletion/file': No such file or directory
-ino not found in dseq index
-ino not found in dseq index
-== lots of deletions use one open map
-== open files survive remote scanning orphans
-mount 0 contents after mount 1 remounted: contents
-ino not found in dseq index
-ino not found in dseq index

tests/golden/large-fragmented-free

@@ -1,3 +0,0 @@
-== creating fragmented extents
-== unlink file with moved extents to free extents per block
-== cleanup

tests/golden/lock-conflicting-batch-commit

@@ -0,0 +1,4 @@
+== create per mount files
+== time independent modification
+== time concurrent independent modification
+== time concurrent conflicting modification

tests/golden/lock-recover-invalidate

@@ -1,3 +0,0 @@
-== starting background invalidating read/write load
-== 60s of lock recovery during invalidating load
-== stopping background load

tests/golden/o_tmpfile

@@ -1,26 +0,0 @@
-== non-acl O_TMPFILE creation honors umask
-umask 022
-fstat after open(0777): 0100755
-stat after linkat: 0100755
-umask 077
-fstat after open(0777): 0100700
-stat after linkat: 0100700
-== stage from tmpfile
-total file size 33669120
-00000000  41 41 41 41 41 41 41 41  41 41 41 41 41 41 41 41  |AAAAAAAAAAAAAAAA|
-*
-00400000  42 42 42 42 42 42 42 42  42 42 42 42 42 42 42 42  |BBBBBBBBBBBBBBBB|
-*
-00801000  43 43 43 43 43 43 43 43  43 43 43 43 43 43 43 43  |CCCCCCCCCCCCCCCC|
-*
-00c03000  44 44 44 44 44 44 44 44  44 44 44 44 44 44 44 44  |DDDDDDDDDDDDDDDD|
-*
-01006000  45 45 45 45 45 45 45 45  45 45 45 45 45 45 45 45  |EEEEEEEEEEEEEEEE|
-*
-0140a000  46 46 46 46 46 46 46 46  46 46 46 46 46 46 46 46  |FFFFFFFFFFFFFFFF|
-*
-0180f000  47 47 47 47 47 47 47 47  47 47 47 47 47 47 47 47  |GGGGGGGGGGGGGGGG|
-*
-01c15000  48 48 48 48 48 48 48 48  48 48 48 48 48 48 48 48  |HHHHHHHHHHHHHHHH|
-*
-0201c000

tests/golden/offline-extent-waiting

@@ -20,10 +20,10 @@ offline waiting should now have two known entries:
 data_wait_err found 2 waiters.
 offline waiting should now have 0 known entries:
 0
-dd: error reading '/mnt/test/test/offline-extent-waiting/dir/file': Input/output error
+dd: error reading ‘/mnt/test/test/offline-extent-waiting/dir/file’: Input/output error
 0+0 records in
 0+0 records out
-dd: error reading '/mnt/test/test/offline-extent-waiting/dir/file': Input/output error
+dd: error reading ‘/mnt/test/test/offline-extent-waiting/dir/file’: Input/output error
 0+0 records in
 0+0 records out
 offline waiting should be empty again:

tests/golden/orphan-inodes

@@ -1,5 +0,0 @@
-== test our inode existance function
-== unlinked and opened inodes still exist
-== orphan from failed evict deletion is picked up
-== orphaned inos in all mounts all deleted
-== 30s of racing evict deletion, orphan scanning, and open by handle