aboutsummaryrefslogtreecommitdiff
path: root/drivers/md/dm-log.h
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/md/dm-log.h')
-rw-r--r--drivers/md/dm-log.h131
1 files changed, 0 insertions, 131 deletions
diff --git a/drivers/md/dm-log.h b/drivers/md/dm-log.h
deleted file mode 100644
index 3fae87eb596..00000000000
--- a/drivers/md/dm-log.h
+++ /dev/null
@@ -1,131 +0,0 @@
-/*
- * Copyright (C) 2003 Sistina Software
- *
- * This file is released under the LGPL.
- */
-
-#ifndef DM_DIRTY_LOG
-#define DM_DIRTY_LOG
-
-#include "dm.h"
-
-typedef sector_t region_t;
-
-struct dirty_log_type;
-
-struct dirty_log {
- struct dirty_log_type *type;
- void *context;
-};
-
-struct dirty_log_type {
- struct list_head list;
- const char *name;
- struct module *module;
- unsigned int use_count;
-
- int (*ctr)(struct dirty_log *log, struct dm_target *ti,
- unsigned int argc, char **argv);
- void (*dtr)(struct dirty_log *log);
-
- /*
- * There are times when we don't want the log to touch
- * the disk.
- */
- int (*presuspend)(struct dirty_log *log);
- int (*postsuspend)(struct dirty_log *log);
- int (*resume)(struct dirty_log *log);
-
- /*
- * Retrieves the smallest size of region that the log can
- * deal with.
- */
- uint32_t (*get_region_size)(struct dirty_log *log);
-
- /*
- * A predicate to say whether a region is clean or not.
- * May block.
- */
- int (*is_clean)(struct 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 dirty_log *log, region_t region, int can_block);
-
- /*
- * Flush the current log state (eg, to disk). This
- * function may block.
- */
- int (*flush)(struct 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 dirty_log *log, region_t region);
- void (*clear_region)(struct 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 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 dirty_log *log,
- region_t region, int in_sync);
-
- /*
- * Returns the number of regions that are in sync.
- */
- region_t (*get_sync_count)(struct dirty_log *log);
-
- /*
- * Support function for mirror status requests.
- */
- int (*status)(struct dirty_log *log, status_type_t status_type,
- char *result, unsigned int maxlen);
-};
-
-int dm_register_dirty_log_type(struct dirty_log_type *type);
-int dm_unregister_dirty_log_type(struct dirty_log_type *type);
-
-
-/*
- * Make sure you use these two functions, rather than calling
- * type->constructor/destructor() directly.
- */
-struct dirty_log *dm_create_dirty_log(const char *type_name, struct dm_target *ti,
- unsigned int argc, char **argv);
-void dm_destroy_dirty_log(struct dirty_log *log);
-
-/*
- * init/exit functions.
- */
-int dm_dirty_log_init(void);
-void dm_dirty_log_exit(void);
-
-#endif