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