105 lines
3.1 KiB
C
105 lines
3.1 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2003 Sistina Software Limited.
|
||
|
|
* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
|
||
|
|
*
|
||
|
|
* Device-Mapper dirty region hash interface.
|
||
|
|
*
|
||
|
|
* This file is released under the GPL.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef DM_REGION_HASH_H
|
||
|
|
#define DM_REGION_HASH_H
|
||
|
|
|
||
|
|
#include <linux/dm-dirty-log.h>
|
||
|
|
|
||
|
|
/*-----------------------------------------------------------------
|
||
|
|
* Region hash
|
||
|
|
*----------------------------------------------------------------*/
|
||
|
|
struct dm_region_hash;
|
||
|
|
struct dm_region;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* States a region can have.
|
||
|
|
*/
|
||
|
|
enum dm_rh_region_states {
|
||
|
|
DM_RH_CLEAN = 0x01, /* No writes in flight. */
|
||
|
|
DM_RH_DIRTY = 0x02, /* Writes in flight. */
|
||
|
|
DM_RH_NOSYNC = 0x04, /* Out of sync. */
|
||
|
|
DM_RH_RECOVERING = 0x08, /* Under resynchronization. */
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Region hash create/destroy.
|
||
|
|
*/
|
||
|
|
struct bio_list;
|
||
|
|
struct dm_region_hash *dm_region_hash_create(
|
||
|
|
void *context, void (*dispatch_bios)(void *context,
|
||
|
|
struct bio_list *bios),
|
||
|
|
void (*wakeup_workers)(void *context),
|
||
|
|
void (*wakeup_all_recovery_waiters)(void *context),
|
||
|
|
sector_t target_begin, unsigned max_recovery,
|
||
|
|
struct dm_dirty_log *log, uint32_t region_size,
|
||
|
|
region_t nr_regions);
|
||
|
|
void dm_region_hash_destroy(struct dm_region_hash *rh);
|
||
|
|
|
||
|
|
struct dm_dirty_log *dm_rh_dirty_log(struct dm_region_hash *rh);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Conversion functions.
|
||
|
|
*/
|
||
|
|
region_t dm_rh_bio_to_region(struct dm_region_hash *rh, struct bio *bio);
|
||
|
|
sector_t dm_rh_region_to_sector(struct dm_region_hash *rh, region_t region);
|
||
|
|
void *dm_rh_region_context(struct dm_region *reg);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Get region size and key (ie. number of the region).
|
||
|
|
*/
|
||
|
|
sector_t dm_rh_get_region_size(struct dm_region_hash *rh);
|
||
|
|
region_t dm_rh_get_region_key(struct dm_region *reg);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Get/set/update region state (and dirty log).
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
int dm_rh_get_state(struct dm_region_hash *rh, region_t region, int may_block);
|
||
|
|
void dm_rh_set_state(struct dm_region_hash *rh, region_t region,
|
||
|
|
enum dm_rh_region_states state, int may_block);
|
||
|
|
|
||
|
|
/* Non-zero errors_handled leaves the state of the region NOSYNC */
|
||
|
|
void dm_rh_update_states(struct dm_region_hash *rh, int errors_handled);
|
||
|
|
|
||
|
|
/* Flush the region hash and dirty log. */
|
||
|
|
int dm_rh_flush(struct dm_region_hash *rh);
|
||
|
|
|
||
|
|
/* Inc/dec pending count on regions. */
|
||
|
|
void dm_rh_inc_pending(struct dm_region_hash *rh, struct bio_list *bios);
|
||
|
|
void dm_rh_dec(struct dm_region_hash *rh, region_t region);
|
||
|
|
|
||
|
|
/* Delay bios on regions. */
|
||
|
|
void dm_rh_delay(struct dm_region_hash *rh, struct bio *bio);
|
||
|
|
|
||
|
|
void dm_rh_mark_nosync(struct dm_region_hash *rh,
|
||
|
|
struct bio *bio, unsigned done, int error);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Region recovery control.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* Prepare some regions for recovery by starting to quiesce them. */
|
||
|
|
void dm_rh_recovery_prepare(struct dm_region_hash *rh);
|
||
|
|
|
||
|
|
/* Try fetching a quiesced region for recovery. */
|
||
|
|
struct dm_region *dm_rh_recovery_start(struct dm_region_hash *rh);
|
||
|
|
|
||
|
|
/* Report recovery end on a region. */
|
||
|
|
void dm_rh_recovery_end(struct dm_region *reg, int error);
|
||
|
|
|
||
|
|
/* Returns number of regions with recovery work outstanding. */
|
||
|
|
int dm_rh_recovery_in_flight(struct dm_region_hash *rh);
|
||
|
|
|
||
|
|
/* Start/stop recovery. */
|
||
|
|
void dm_rh_start_recovery(struct dm_region_hash *rh);
|
||
|
|
void dm_rh_stop_recovery(struct dm_region_hash *rh);
|
||
|
|
|
||
|
|
#endif /* DM_REGION_HASH_H */
|