mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 16:10:49 +07:00
a765e20eeb
Publish the dm-io, dm-log and dm-kcopyd headers in include/linux. Signed-off-by: Alasdair G Kergon <agk@redhat.com>
132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
/*
|
|
* Copyright (C) 2003 Sistina Software
|
|
* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* Device-Mapper dirty region log.
|
|
*
|
|
* This file is released under the LGPL.
|
|
*/
|
|
|
|
#ifndef _LINUX_DM_DIRTY_LOG
|
|
#define _LINUX_DM_DIRTY_LOG
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/device-mapper.h>
|
|
|
|
typedef sector_t region_t;
|
|
|
|
struct dm_dirty_log_type;
|
|
|
|
struct dm_dirty_log {
|
|
struct dm_dirty_log_type *type;
|
|
void *context;
|
|
};
|
|
|
|
struct dm_dirty_log_type {
|
|
const char *name;
|
|
struct module *module;
|
|
|
|
int (*ctr)(struct dm_dirty_log *log, struct dm_target *ti,
|
|
unsigned argc, char **argv);
|
|
void (*dtr)(struct dm_dirty_log *log);
|
|
|
|
/*
|
|
* There are times when we don't want the log to touch
|
|
* the disk.
|
|
*/
|
|
int (*presuspend)(struct dm_dirty_log *log);
|
|
int (*postsuspend)(struct dm_dirty_log *log);
|
|
int (*resume)(struct dm_dirty_log *log);
|
|
|
|
/*
|
|
* Retrieves the smallest size of region that the log can
|
|
* deal with.
|
|
*/
|
|
uint32_t (*get_region_size)(struct dm_dirty_log *log);
|
|
|
|
/*
|
|
* A predicate to say whether a region is clean or not.
|
|
* May block.
|
|
*/
|
|
int (*is_clean)(struct dm_dirty_log *log, region_t region);
|
|
|
|
/*
|
|
* Returns: 0, 1, -EWOULDBLOCK, < 0
|
|
*
|
|
* A predicate function to check the area given by
|
|
* [sector, sector + len) is in sync.
|
|
*
|
|
* If -EWOULDBLOCK is returned the state of the region is
|
|
* unknown, typically this will result in a read being
|
|
* passed to a daemon to deal with, since a daemon is
|
|
* allowed to block.
|
|
*/
|
|
int (*in_sync)(struct dm_dirty_log *log, region_t region,
|
|
int can_block);
|
|
|
|
/*
|
|
* Flush the current log state (eg, to disk). This
|
|
* function may block.
|
|
*/
|
|
int (*flush)(struct dm_dirty_log *log);
|
|
|
|
/*
|
|
* Mark an area as clean or dirty. These functions may
|
|
* block, though for performance reasons blocking should
|
|
* be extremely rare (eg, allocating another chunk of
|
|
* memory for some reason).
|
|
*/
|
|
void (*mark_region)(struct dm_dirty_log *log, region_t region);
|
|
void (*clear_region)(struct dm_dirty_log *log, region_t region);
|
|
|
|
/*
|
|
* Returns: <0 (error), 0 (no region), 1 (region)
|
|
*
|
|
* The mirrord will need perform recovery on regions of
|
|
* the mirror that are in the NOSYNC state. This
|
|
* function asks the log to tell the caller about the
|
|
* next region that this machine should recover.
|
|
*
|
|
* Do not confuse this function with 'in_sync()', one
|
|
* tells you if an area is synchronised, the other
|
|
* assigns recovery work.
|
|
*/
|
|
int (*get_resync_work)(struct dm_dirty_log *log, region_t *region);
|
|
|
|
/*
|
|
* This notifies the log that the resync status of a region
|
|
* has changed. It also clears the region from the recovering
|
|
* list (if present).
|
|
*/
|
|
void (*set_region_sync)(struct dm_dirty_log *log,
|
|
region_t region, int in_sync);
|
|
|
|
/*
|
|
* Returns the number of regions that are in sync.
|
|
*/
|
|
region_t (*get_sync_count)(struct dm_dirty_log *log);
|
|
|
|
/*
|
|
* Support function for mirror status requests.
|
|
*/
|
|
int (*status)(struct dm_dirty_log *log, status_type_t status_type,
|
|
char *result, unsigned maxlen);
|
|
};
|
|
|
|
int dm_dirty_log_type_register(struct dm_dirty_log_type *type);
|
|
int dm_dirty_log_type_unregister(struct dm_dirty_log_type *type);
|
|
|
|
/*
|
|
* Make sure you use these two functions, rather than calling
|
|
* type->constructor/destructor() directly.
|
|
*/
|
|
struct dm_dirty_log *dm_dirty_log_create(const char *type_name,
|
|
struct dm_target *ti,
|
|
unsigned argc, char **argv);
|
|
void dm_dirty_log_destroy(struct dm_dirty_log *log);
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _LINUX_DM_DIRTY_LOG_H */
|