projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 3bd94003 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 1f965b19 HM |
2 | /* |
| 3 | * Copyright (C) 2003 Sistina Software Limited. | |
| 4 | * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. | |
| 5 | * | |
| 6 | * Device-Mapper dirty region hash interface. | |
| 7 | * | |
| 8 | * This file is released under the GPL. | |
| 9 | */ | |
| 10 | ||
| 11 | #ifndef DM_REGION_HASH_H | |
| 12 | #define DM_REGION_HASH_H | |
| 13 | ||
| 14 | #include <linux/dm-dirty-log.h> | |
| 15 | ||
| a4a82ce3 HM |
16 | /* |
| 17 | *---------------------------------------------------------------- | |
| 1f965b19 | 18 | * Region hash |
| a4a82ce3 HM |
19 | *---------------------------------------------------------------- |
| 20 | */ | |
| 1f965b19 HM |
21 | struct dm_region_hash; |
| 22 | struct dm_region; | |
| 23 | ||
| 24 | /* | |
| 25 | * States a region can have. | |
| 26 | */ | |
| 27 | enum dm_rh_region_states { | |
| 28 | DM_RH_CLEAN = 0x01, /* No writes in flight. */ | |
| 29 | DM_RH_DIRTY = 0x02, /* Writes in flight. */ | |
| 30 | DM_RH_NOSYNC = 0x04, /* Out of sync. */ | |
| 31 | DM_RH_RECOVERING = 0x08, /* Under resynchronization. */ | |
| 32 | }; | |
| 33 | ||
| 34 | /* | |
| 35 | * Region hash create/destroy. | |
| 36 | */ | |
| 37 | struct bio_list; | |
| 38 | struct dm_region_hash *dm_region_hash_create( | |
| 39 | void *context, void (*dispatch_bios)(void *context, | |
| 40 | struct bio_list *bios), | |
| 41 | void (*wakeup_workers)(void *context), | |
| 42 | void (*wakeup_all_recovery_waiters)(void *context), | |
| 86a3238c | 43 | sector_t target_begin, unsigned int max_recovery, |
| 1f965b19 HM |
44 | struct dm_dirty_log *log, uint32_t region_size, |
| 45 | region_t nr_regions); | |
| 46 | void dm_region_hash_destroy(struct dm_region_hash *rh); | |
| 47 | ||
| 48 | struct dm_dirty_log *dm_rh_dirty_log(struct dm_region_hash *rh); | |
| 49 | ||
| 50 | /* | |
| 51 | * Conversion functions. | |
| 52 | */ | |
| 53 | region_t dm_rh_bio_to_region(struct dm_region_hash *rh, struct bio *bio); | |
| 54 | sector_t dm_rh_region_to_sector(struct dm_region_hash *rh, region_t region); | |
| 55 | void *dm_rh_region_context(struct dm_region *reg); | |
| 56 | ||
| 57 | /* | |
| 58 | * Get region size and key (ie. number of the region). | |
| 59 | */ | |
| 60 | sector_t dm_rh_get_region_size(struct dm_region_hash *rh); | |
| 61 | region_t dm_rh_get_region_key(struct dm_region *reg); | |
| 62 | ||
| 63 | /* | |
| 64 | * Get/set/update region state (and dirty log). | |
| 65 | * | |
| 66 | */ | |
| 67 | int dm_rh_get_state(struct dm_region_hash *rh, region_t region, int may_block); | |
| 68 | void dm_rh_set_state(struct dm_region_hash *rh, region_t region, | |
| 69 | enum dm_rh_region_states state, int may_block); | |
| 70 | ||
| 71 | /* Non-zero errors_handled leaves the state of the region NOSYNC */ | |
| 72 | void dm_rh_update_states(struct dm_region_hash *rh, int errors_handled); | |
| 73 | ||
| 74 | /* Flush the region hash and dirty log. */ | |
| 75 | int dm_rh_flush(struct dm_region_hash *rh); | |
| 76 | ||
| 77 | /* Inc/dec pending count on regions. */ | |
| 78 | void dm_rh_inc_pending(struct dm_region_hash *rh, struct bio_list *bios); | |
| 79 | void dm_rh_dec(struct dm_region_hash *rh, region_t region); | |
| 80 | ||
| 81 | /* Delay bios on regions. */ | |
| 82 | void dm_rh_delay(struct dm_region_hash *rh, struct bio *bio); | |
| 83 | ||
| c58098be | 84 | void dm_rh_mark_nosync(struct dm_region_hash *rh, struct bio *bio); |
| 1f965b19 HM |
85 | |
| 86 | /* | |
| 87 | * Region recovery control. | |
| 88 | */ | |
| 89 | ||
| 90 | /* Prepare some regions for recovery by starting to quiesce them. */ | |
| 91 | void dm_rh_recovery_prepare(struct dm_region_hash *rh); | |
| 92 | ||
| 93 | /* Try fetching a quiesced region for recovery. */ | |
| 94 | struct dm_region *dm_rh_recovery_start(struct dm_region_hash *rh); | |
| 95 | ||
| 96 | /* Report recovery end on a region. */ | |
| 97 | void dm_rh_recovery_end(struct dm_region *reg, int error); | |
| 98 | ||
| 99 | /* Returns number of regions with recovery work outstanding. */ | |
| 100 | int dm_rh_recovery_in_flight(struct dm_region_hash *rh); | |
| 101 | ||
| 102 | /* Start/stop recovery. */ | |
| 103 | void dm_rh_start_recovery(struct dm_region_hash *rh); | |
| 104 | void dm_rh_stop_recovery(struct dm_region_hash *rh); | |
| 105 | ||
| 106 | #endif /* DM_REGION_HASH_H */ |