mirrors/scoutfs
1
0
Fork 0
mirror of https://github.com/versity/scoutfs.git synced 2025-12-23 05:25:18 +00:00
Code Issues Packages Projects Releases Wiki Activity

Search for file data that has changed

Browse Source 
We don't overwrite existing data.  Every file data write has to allocate
new blocks and update block mapping items.

We can search for inodes whose data has changed by filtering block
mapping item walks by the sequence number.  We do this by using the
exact same code for finding changed inodes but using the block mapping
key type.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2016-10-19 15:05:04 -07:00
parent 5b7f9ddbe2
commit 16e94f6b7c
2 changed files with 22 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
kmod/src/ioctl.c
View File

@@ -26,12 +26,22 @@
#include "super.h"
/*
* Find all the inodes in the given inode range that have changed since
* the given tree update sequence number.
* Find all the inodes that have had keys of a given type modified since
* a given sequence number. The user's arg struct specifies the inode
* range to search within and the sequence value to return results from.
* Different ioctls call this for different key types.
*
* The inodes are returned in inode order, not sequence order.
* When this is used for file data items the user is trying to find
* inodes whose data has changed since a given time in the past.
*
* XXX We'll need to improve the walk and search to notice when file
* data items have been truncated away.
*
* Inodes and their sequence numbers are copied out to userspace in
* inode order, not sequence order.
*/
static long scoutfs_ioc_inodes_since(struct file *file, unsigned long arg)
static long scoutfs_ioc_inodes_since(struct file *file, unsigned long arg,
u8 type)
{
struct super_block *sb = file_inode(file)->i_sb;
struct scoutfs_btree_root *meta = SCOUTFS_META(sb);
@@ -52,8 +62,8 @@ static long scoutfs_ioc_inodes_since(struct file *file, unsigned long arg)
if (args.buf_len < sizeof(iseq) || args.buf_len > INT_MAX)
return -EINVAL;
scoutfs_set_key(&key, args.first_ino, SCOUTFS_INODE_KEY, 0);
scoutfs_set_key(&last, args.last_ino, SCOUTFS_INODE_KEY, 0);
scoutfs_set_key(&key, args.first_ino, type, 0);
scoutfs_set_key(&last, args.last_ino, type, 0);
bytes = 0;
for (;;) {
@@ -80,7 +90,7 @@ static long scoutfs_ioc_inodes_since(struct file *file, unsigned long arg)
break;
}
scoutfs_inc_key(&key);
key.inode = cpu_to_le64(iseq.ino + 1);
}
if (bytes)
@@ -286,13 +296,15 @@ long scoutfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
switch (cmd) {
case SCOUTFS_IOC_INODES_SINCE:
return scoutfs_ioc_inodes_since(file, arg);
return scoutfs_ioc_inodes_since(file, arg, SCOUTFS_INODE_KEY);
case SCOUTFS_IOC_INODE_PATHS:
return scoutfs_ioc_inode_paths(file, arg);
case SCOUTFS_IOC_FIND_XATTR_NAME:
return scoutfs_ioc_find_xattr(file, arg, true);
case SCOUTFS_IOC_FIND_XATTR_VAL:
return scoutfs_ioc_find_xattr(file, arg, false);
case SCOUTFS_IOC_INODE_DATA_SINCE:
return scoutfs_ioc_inodes_since(file, arg, SCOUTFS_BMAP_KEY);
}
return -ENOTTY;

2
kmod/src/ioctl.h
View File

@@ -54,4 +54,6 @@ struct scoutfs_ioctl_find_xattr {
#define SCOUTFS_IOC_FIND_XATTR_VAL _IOW(SCOUTFS_IOCTL_MAGIC, 4, \
struct scoutfs_ioctl_find_xattr)
#define SCOUTFS_IOC_INODE_DATA_SINCE _IOW(SCOUTFS_IOCTL_MAGIC, 5, \
struct scoutfs_ioctl_inodes_since)
#endif