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- /*
- * 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);
- /*
- * 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 */
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