mirror of
https://github.com/versity/scoutfs.git
synced 2026-02-09 12:10:09 +00:00
08bf1fea79
Using the new interval tree code we add a tree for each lock status list to efficiently track ranged requests. Internally, most operations on a resources lock status list (granted, waiting, converting) then are turned into operations within a given range. There is no API change other than a new call, dlm_lock_range() and a new structure, 'struct dlm_key' to define our range endpoints. Keys can have arbitrary lengths and are compared via memcmp. A ranged blocking ast type is defined so that users of dlm_lock_range() can know which range they are blocking. A rudimentary test, dlmtest.ko is included. TODO: - Update userspace entry points, need to add one for new lock call - Manage backwards compatibility with network protocol Signed-off-by: Mark Fasheh <mfasheh@versity.com>
194 lines
6.5 KiB
C
194 lines
6.5 KiB
C
/******************************************************************************
|
|
*******************************************************************************
|
|
**
|
|
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
|
|
** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
|
|
**
|
|
** This copyrighted material is made available to anyone wishing to use,
|
|
** modify, copy, or redistribute it subject to the terms and conditions
|
|
** of the GNU General Public License v.2.
|
|
**
|
|
*******************************************************************************
|
|
******************************************************************************/
|
|
#ifndef __DLM_DOT_H__
|
|
#define __DLM_DOT_H__
|
|
|
|
#include <uapi/linux/dlm.h>
|
|
|
|
|
|
struct dlm_slot {
|
|
int nodeid; /* 1 to MAX_INT */
|
|
int slot; /* 1 to MAX_INT */
|
|
};
|
|
|
|
/*
|
|
* recover_prep: called before the dlm begins lock recovery.
|
|
* Notfies lockspace user that locks from failed members will be granted.
|
|
* recover_slot: called after recover_prep and before recover_done.
|
|
* Identifies a failed lockspace member.
|
|
* recover_done: called after the dlm completes lock recovery.
|
|
* Identifies lockspace members and lockspace generation number.
|
|
*/
|
|
|
|
struct dlm_lockspace_ops {
|
|
void (*recover_prep) (void *ops_arg);
|
|
void (*recover_slot) (void *ops_arg, struct dlm_slot *slot);
|
|
void (*recover_done) (void *ops_arg, struct dlm_slot *slots,
|
|
int num_slots, int our_slot, uint32_t generation);
|
|
};
|
|
|
|
/*
|
|
* dlm_new_lockspace
|
|
*
|
|
* Create/join a lockspace.
|
|
*
|
|
* name: lockspace name, null terminated, up to DLM_LOCKSPACE_LEN (not
|
|
* including terminating null).
|
|
*
|
|
* cluster: cluster name, null terminated, up to DLM_LOCKSPACE_LEN (not
|
|
* including terminating null). Optional. When cluster is null, it
|
|
* is not used. When set, dlm_new_lockspace() returns -EBADR if cluster
|
|
* is not equal to the dlm cluster name.
|
|
*
|
|
* flags:
|
|
* DLM_LSFL_NODIR
|
|
* The dlm should not use a resource directory, but statically assign
|
|
* resource mastery to nodes based on the name hash that is otherwise
|
|
* used to select the directory node. Must be the same on all nodes.
|
|
* DLM_LSFL_TIMEWARN
|
|
* The dlm should emit netlink messages if locks have been waiting
|
|
* for a configurable amount of time. (Unused.)
|
|
* DLM_LSFL_FS
|
|
* The lockspace user is in the kernel (i.e. filesystem). Enables
|
|
* direct bast/cast callbacks.
|
|
* DLM_LSFL_NEWEXCL
|
|
* dlm_new_lockspace() should return -EEXIST if the lockspace exists.
|
|
*
|
|
* lvblen: length of lvb in bytes. Must be multiple of 8.
|
|
* dlm_new_lockspace() returns an error if this does not match
|
|
* what other nodes are using.
|
|
*
|
|
* ops: callbacks that indicate lockspace recovery points so the
|
|
* caller can coordinate its recovery and know lockspace members.
|
|
* This is only used by the initial dlm_new_lockspace() call.
|
|
* Optional.
|
|
*
|
|
* ops_arg: arg for ops callbacks.
|
|
*
|
|
* ops_result: tells caller if the ops callbacks (if provided) will
|
|
* be used or not. 0: will be used, -EXXX will not be used.
|
|
* -EOPNOTSUPP: the dlm does not have recovery_callbacks enabled.
|
|
*
|
|
* lockspace: handle for dlm functions
|
|
*/
|
|
|
|
int dlm_new_lockspace(const char *name, const char *cluster,
|
|
uint32_t flags, int lvblen,
|
|
const struct dlm_lockspace_ops *ops, void *ops_arg,
|
|
int *ops_result, dlm_lockspace_t **lockspace);
|
|
|
|
/*
|
|
* dlm_release_lockspace
|
|
*
|
|
* Stop a lockspace.
|
|
*/
|
|
|
|
int dlm_release_lockspace(dlm_lockspace_t *lockspace, int force);
|
|
|
|
/*
|
|
* dlm_lock
|
|
*
|
|
* Make an asynchronous request to acquire or convert a lock on a named
|
|
* resource.
|
|
*
|
|
* lockspace: context for the request
|
|
* mode: the requested mode of the lock (DLM_LOCK_)
|
|
* lksb: lock status block for input and async return values
|
|
* flags: input flags (DLM_LKF_)
|
|
* name: name of the resource to lock, can be binary
|
|
* namelen: the length in bytes of the resource name (MAX_RESNAME_LEN)
|
|
* parent: the lock ID of a parent lock or 0 if none
|
|
* lockast: function DLM executes when it completes processing the request
|
|
* astarg: argument passed to lockast and bast functions
|
|
* bast: function DLM executes when this lock later blocks another request
|
|
*
|
|
* Returns:
|
|
* 0 if request is successfully queued for processing
|
|
* -EINVAL if any input parameters are invalid
|
|
* -EAGAIN if request would block and is flagged DLM_LKF_NOQUEUE
|
|
* -ENOMEM if there is no memory to process request
|
|
* -ENOTCONN if there is a communication error
|
|
*
|
|
* If the call to dlm_lock returns an error then the operation has failed and
|
|
* the AST routine will not be called. If dlm_lock returns 0 it is still
|
|
* possible that the lock operation will fail. The AST routine will be called
|
|
* when the locking is complete and the status is returned in the lksb.
|
|
*
|
|
* If the AST routines or parameter are passed to a conversion operation then
|
|
* they will overwrite those values that were passed to a previous dlm_lock
|
|
* call.
|
|
*
|
|
* AST routines should not block (at least not for long), but may make
|
|
* any locking calls they please.
|
|
*/
|
|
|
|
int dlm_lock(dlm_lockspace_t *lockspace,
|
|
int mode,
|
|
struct dlm_lksb *lksb,
|
|
uint32_t flags,
|
|
void *name,
|
|
unsigned int namelen,
|
|
uint32_t parent_lkid,
|
|
void (*lockast) (void *astarg),
|
|
void *astarg,
|
|
void (*bast) (void *astarg, int mode));
|
|
|
|
/*
|
|
* dlm_unlock
|
|
*
|
|
* Asynchronously release a lock on a resource. The AST routine is called
|
|
* when the resource is successfully unlocked.
|
|
*
|
|
* lockspace: context for the request
|
|
* lkid: the lock ID as returned in the lksb
|
|
* flags: input flags (DLM_LKF_)
|
|
* lksb: if NULL the lksb parameter passed to last lock request is used
|
|
* astarg: the arg used with the completion ast for the unlock
|
|
*
|
|
* Returns:
|
|
* 0 if request is successfully queued for processing
|
|
* -EINVAL if any input parameters are invalid
|
|
* -ENOTEMPTY if the lock still has sublocks
|
|
* -EBUSY if the lock is waiting for a remote lock operation
|
|
* -ENOTCONN if there is a communication error
|
|
*/
|
|
|
|
int dlm_unlock(dlm_lockspace_t *lockspace,
|
|
uint32_t lkid,
|
|
uint32_t flags,
|
|
struct dlm_lksb *lksb,
|
|
void *astarg);
|
|
|
|
struct dlm_key {
|
|
void *val;
|
|
int len;
|
|
};
|
|
|
|
int dlm_lock_range(dlm_lockspace_t *lockspace,
|
|
int mode,
|
|
struct dlm_key *start,
|
|
struct dlm_key *end,
|
|
struct dlm_lksb *lksb,
|
|
uint32_t flags,
|
|
void *name,
|
|
unsigned int namelen,
|
|
uint32_t parent_lkid,
|
|
void (*lockast) (void *astarg),
|
|
void *astarg,
|
|
void (*rbast) (void *astarg, int mode,
|
|
struct dlm_key *start, struct dlm_key *end));
|
|
|
|
#define dlm_unlock_range dlm_unlock
|
|
|
|
#endif /* __DLM_DOT_H__ */
|