Lines Matching +full:cache +full:- +full:block
1 // SPDX-License-Identifier: GPL-2.0-only
9 #include "dm-bio-prison-v2.h"
10 #include "dm-bio-record.h"
11 #include "dm-cache-metadata.h"
12 #include "dm-io-tracker.h"
13 #include "dm-cache-background-tracker.h"
15 #include <linux/dm-io.h>
16 #include <linux/dm-kcopyd.h>
25 #define DM_MSG_PREFIX "cache"
28 "A percentage of time allocated for copying to and/or from cache");
30 /*----------------------------------------------------------------*/
35 * oblock: index of an origin block
36 * cblock: index of a cache block
37 * promotion: movement of a block from origin to cache
38 * demotion: movement of a block from cache to origin
39 * migration: movement of a block between the origin and cache device,
43 /*----------------------------------------------------------------*/
57 INIT_WORK(&k->ws, fn); in init_continuation()
58 k->input = 0; in init_continuation()
64 queue_work(wq, &k->ws); in queue_continuation()
67 /*----------------------------------------------------------------*/
117 spin_lock_irq(&b->lock); in __commit()
118 list_splice_init(&b->work_items, &work_items); in __commit()
119 bio_list_merge_init(&bios, &b->bios); in __commit()
120 b->commit_scheduled = false; in __commit()
121 spin_unlock_irq(&b->lock); in __commit()
123 r = b->commit_op(b->commit_context); in __commit()
127 k->input = r; in __commit()
128 INIT_LIST_HEAD(&ws->entry); /* to avoid a WARN_ON */ in __commit()
129 queue_work(b->wq, ws); in __commit()
134 bio->bi_status = r; in __commit()
137 b->issue_op(bio, b->issue_context); in __commit()
148 b->commit_op = commit_op; in batcher_init()
149 b->commit_context = commit_context; in batcher_init()
150 b->issue_op = issue_op; in batcher_init()
151 b->issue_context = issue_context; in batcher_init()
152 b->wq = wq; in batcher_init()
154 spin_lock_init(&b->lock); in batcher_init()
155 INIT_LIST_HEAD(&b->work_items); in batcher_init()
156 bio_list_init(&b->bios); in batcher_init()
157 INIT_WORK(&b->commit_work, __commit); in batcher_init()
158 b->commit_scheduled = false; in batcher_init()
163 queue_work(b->wq, &b->commit_work); in async_commit()
170 spin_lock_irq(&b->lock); in continue_after_commit()
171 commit_scheduled = b->commit_scheduled; in continue_after_commit()
172 list_add_tail(&k->ws.entry, &b->work_items); in continue_after_commit()
173 spin_unlock_irq(&b->lock); in continue_after_commit()
186 spin_lock_irq(&b->lock); in issue_after_commit()
187 commit_scheduled = b->commit_scheduled; in issue_after_commit()
188 bio_list_add(&b->bios, bio); in issue_after_commit()
189 spin_unlock_irq(&b->lock); in issue_after_commit()
202 spin_lock_irq(&b->lock); in schedule_commit()
203 immediate = !list_empty(&b->work_items) || !bio_list_empty(&b->bios); in schedule_commit()
204 b->commit_scheduled = true; in schedule_commit()
205 spin_unlock_irq(&b->lock); in schedule_commit()
223 h->bi_end_io = bio->bi_end_io; in dm_hook_bio()
225 bio->bi_end_io = bi_end_io; in dm_hook_bio()
226 bio->bi_private = bi_private; in dm_hook_bio()
231 bio->bi_end_io = h->bi_end_io; in dm_unhook_bio()
234 /*----------------------------------------------------------------*/
241 * The block size of the device holding cache data must be
256 * dirty. If you lose the cache device you will lose data.
262 * Data is written to both cache and origin. Blocks are never
268 * A degraded mode useful for various cache coherency situations
270 * origin. If a write goes to a cached oblock, then the cache
271 * block is invalidated.
297 struct cache { struct
331 * Size of the cache device in blocks. argument
360 uint32_t discard_block_size; /* a power of 2 times sectors per block */
386 * Cache features such as write-through.
421 struct cache *cache; argument
431 /*----------------------------------------------------------------*/
433 static bool writethrough_mode(struct cache *cache) in writethrough_mode() argument
435 return cache->features.io_mode == CM_IO_WRITETHROUGH; in writethrough_mode()
438 static bool writeback_mode(struct cache *cache) in writeback_mode() argument
440 return cache->features.io_mode == CM_IO_WRITEBACK; in writeback_mode()
443 static inline bool passthrough_mode(struct cache *cache) in passthrough_mode() argument
445 return unlikely(cache->features.io_mode == CM_IO_PASSTHROUGH); in passthrough_mode()
448 /*----------------------------------------------------------------*/
450 static void wake_deferred_bio_worker(struct cache *cache) in wake_deferred_bio_worker() argument
452 queue_work(cache->wq, &cache->deferred_bio_worker); in wake_deferred_bio_worker()
455 static void wake_migration_worker(struct cache *cache) in wake_migration_worker() argument
457 if (passthrough_mode(cache)) in wake_migration_worker()
460 queue_work(cache->wq, &cache->migration_worker); in wake_migration_worker()
463 /*----------------------------------------------------------------*/
465 static struct dm_bio_prison_cell_v2 *alloc_prison_cell(struct cache *cache) in alloc_prison_cell() argument
467 return dm_bio_prison_alloc_cell_v2(cache->prison, GFP_NOIO); in alloc_prison_cell()
470 static void free_prison_cell(struct cache *cache, struct dm_bio_prison_cell_v2 *cell) in free_prison_cell() argument
472 dm_bio_prison_free_cell_v2(cache->prison, cell); in free_prison_cell()
475 static struct dm_cache_migration *alloc_migration(struct cache *cache) in alloc_migration() argument
479 mg = mempool_alloc(&cache->migration_pool, GFP_NOIO); in alloc_migration()
483 mg->cache = cache; in alloc_migration()
484 atomic_inc(&cache->nr_allocated_migrations); in alloc_migration()
491 struct cache *cache = mg->cache; in free_migration() local
493 if (atomic_dec_and_test(&cache->nr_allocated_migrations)) in free_migration()
494 wake_up(&cache->migration_wait); in free_migration()
496 mempool_free(mg, &cache->migration_pool); in free_migration()
499 /*----------------------------------------------------------------*/
508 key->virtual = 0; in build_key()
509 key->dev = 0; in build_key()
510 key->block_begin = from_oblock(begin); in build_key()
511 key->block_end = from_oblock(end); in build_key()
529 *--------------------------------------------------------------
531 *--------------------------------------------------------------
546 pb->tick = false; in init_per_bio_data()
547 pb->req_nr = dm_bio_get_target_bio_nr(bio); in init_per_bio_data()
548 pb->cell = NULL; in init_per_bio_data()
549 pb->len = 0; in init_per_bio_data()
554 /*----------------------------------------------------------------*/
556 static void defer_bio(struct cache *cache, struct bio *bio) in defer_bio() argument
558 spin_lock_irq(&cache->lock); in defer_bio()
559 bio_list_add(&cache->deferred_bios, bio); in defer_bio()
560 spin_unlock_irq(&cache->lock); in defer_bio()
562 wake_deferred_bio_worker(cache); in defer_bio()
565 static void defer_bios(struct cache *cache, struct bio_list *bios) in defer_bios() argument
567 spin_lock_irq(&cache->lock); in defer_bios()
568 bio_list_merge_init(&cache->deferred_bios, bios); in defer_bios()
569 spin_unlock_irq(&cache->lock); in defer_bios()
571 wake_deferred_bio_worker(cache); in defer_bios()
574 /*----------------------------------------------------------------*/
576 static bool bio_detain_shared(struct cache *cache, dm_oblock_t oblock, struct bio *bio) in bio_detain_shared() argument
584 cell_prealloc = alloc_prison_cell(cache); /* FIXME: allow wait if calling from worker */ in bio_detain_shared()
587 r = dm_cell_get_v2(cache->prison, &key, lock_level(bio), bio, cell_prealloc, &cell); in bio_detain_shared()
592 free_prison_cell(cache, cell_prealloc); in bio_detain_shared()
597 free_prison_cell(cache, cell_prealloc); in bio_detain_shared()
600 pb->cell = cell; in bio_detain_shared()
605 /*----------------------------------------------------------------*/
607 static bool is_dirty(struct cache *cache, dm_cblock_t b) in is_dirty() argument
609 return test_bit(from_cblock(b), cache->dirty_bitset); in is_dirty()
612 static void set_dirty(struct cache *cache, dm_cblock_t cblock) in set_dirty() argument
614 if (!test_and_set_bit(from_cblock(cblock), cache->dirty_bitset)) { in set_dirty()
615 atomic_inc(&cache->nr_dirty); in set_dirty()
616 policy_set_dirty(cache->policy, cblock); in set_dirty()
624 static void force_set_dirty(struct cache *cache, dm_cblock_t cblock) in force_set_dirty() argument
626 if (!test_and_set_bit(from_cblock(cblock), cache->dirty_bitset)) in force_set_dirty()
627 atomic_inc(&cache->nr_dirty); in force_set_dirty()
628 policy_set_dirty(cache->policy, cblock); in force_set_dirty()
631 static void force_clear_dirty(struct cache *cache, dm_cblock_t cblock) in force_clear_dirty() argument
633 if (test_and_clear_bit(from_cblock(cblock), cache->dirty_bitset)) { in force_clear_dirty()
634 if (atomic_dec_return(&cache->nr_dirty) == 0) in force_clear_dirty()
635 dm_table_event(cache->ti->table); in force_clear_dirty()
638 policy_clear_dirty(cache->policy, cblock); in force_clear_dirty()
641 /*----------------------------------------------------------------*/
643 static bool block_size_is_power_of_two(struct cache *cache) in block_size_is_power_of_two() argument
645 return cache->sectors_per_block_shift >= 0; in block_size_is_power_of_two()
655 static dm_block_t oblocks_per_dblock(struct cache *cache) in oblocks_per_dblock() argument
657 dm_block_t oblocks = cache->discard_block_size; in oblocks_per_dblock()
659 if (block_size_is_power_of_two(cache)) in oblocks_per_dblock()
660 oblocks >>= cache->sectors_per_block_shift; in oblocks_per_dblock()
662 oblocks = block_div(oblocks, cache->sectors_per_block); in oblocks_per_dblock()
667 static dm_dblock_t oblock_to_dblock(struct cache *cache, dm_oblock_t oblock) in oblock_to_dblock() argument
670 oblocks_per_dblock(cache))); in oblock_to_dblock()
673 static void set_discard(struct cache *cache, dm_dblock_t b) in set_discard() argument
675 BUG_ON(from_dblock(b) >= from_dblock(cache->discard_nr_blocks)); in set_discard()
676 atomic_inc(&cache->stats.discard_count); in set_discard()
678 spin_lock_irq(&cache->lock); in set_discard()
679 set_bit(from_dblock(b), cache->discard_bitset); in set_discard()
680 spin_unlock_irq(&cache->lock); in set_discard()
683 static void clear_discard(struct cache *cache, dm_dblock_t b) in clear_discard() argument
685 spin_lock_irq(&cache->lock); in clear_discard()
686 clear_bit(from_dblock(b), cache->discard_bitset); in clear_discard()
687 spin_unlock_irq(&cache->lock); in clear_discard()
690 static bool is_discarded(struct cache *cache, dm_dblock_t b) in is_discarded() argument
694 spin_lock_irq(&cache->lock); in is_discarded()
695 r = test_bit(from_dblock(b), cache->discard_bitset); in is_discarded()
696 spin_unlock_irq(&cache->lock); in is_discarded()
701 static bool is_discarded_oblock(struct cache *cache, dm_oblock_t b) in is_discarded_oblock() argument
705 spin_lock_irq(&cache->lock); in is_discarded_oblock()
706 r = test_bit(from_dblock(oblock_to_dblock(cache, b)), in is_discarded_oblock()
707 cache->discard_bitset); in is_discarded_oblock()
708 spin_unlock_irq(&cache->lock); in is_discarded_oblock()
714 * -------------------------------------------------------------
716 *--------------------------------------------------------------
718 static void remap_to_origin(struct cache *cache, struct bio *bio) in remap_to_origin() argument
720 bio_set_dev(bio, cache->origin_dev->bdev); in remap_to_origin()
723 static void remap_to_cache(struct cache *cache, struct bio *bio, in remap_to_cache() argument
726 sector_t bi_sector = bio->bi_iter.bi_sector; in remap_to_cache()
727 sector_t block = from_cblock(cblock); in remap_to_cache() local
729 bio_set_dev(bio, cache->cache_dev->bdev); in remap_to_cache()
730 if (!block_size_is_power_of_two(cache)) in remap_to_cache()
731 bio->bi_iter.bi_sector = in remap_to_cache()
732 (block * cache->sectors_per_block) + in remap_to_cache()
733 sector_div(bi_sector, cache->sectors_per_block); in remap_to_cache()
735 bio->bi_iter.bi_sector = in remap_to_cache()
736 (block << cache->sectors_per_block_shift) | in remap_to_cache()
737 (bi_sector & (cache->sectors_per_block - 1)); in remap_to_cache()
740 static void check_if_tick_bio_needed(struct cache *cache, struct bio *bio) in check_if_tick_bio_needed() argument
744 spin_lock_irq(&cache->lock); in check_if_tick_bio_needed()
745 if (cache->need_tick_bio && !op_is_flush(bio->bi_opf) && in check_if_tick_bio_needed()
748 pb->tick = true; in check_if_tick_bio_needed()
749 cache->need_tick_bio = false; in check_if_tick_bio_needed()
751 spin_unlock_irq(&cache->lock); in check_if_tick_bio_needed()
754 static void remap_to_origin_clear_discard(struct cache *cache, struct bio *bio, in remap_to_origin_clear_discard() argument
758 check_if_tick_bio_needed(cache, bio); in remap_to_origin_clear_discard()
759 remap_to_origin(cache, bio); in remap_to_origin_clear_discard()
761 clear_discard(cache, oblock_to_dblock(cache, oblock)); in remap_to_origin_clear_discard()
764 static void remap_to_cache_dirty(struct cache *cache, struct bio *bio, in remap_to_cache_dirty() argument
767 check_if_tick_bio_needed(cache, bio); in remap_to_cache_dirty()
768 remap_to_cache(cache, bio, cblock); in remap_to_cache_dirty()
770 set_dirty(cache, cblock); in remap_to_cache_dirty()
771 clear_discard(cache, oblock_to_dblock(cache, oblock)); in remap_to_cache_dirty()
775 static dm_oblock_t get_bio_block(struct cache *cache, struct bio *bio) in get_bio_block() argument
777 sector_t block_nr = bio->bi_iter.bi_sector; in get_bio_block()
779 if (!block_size_is_power_of_two(cache)) in get_bio_block()
780 (void) sector_div(block_nr, cache->sectors_per_block); in get_bio_block()
782 block_nr >>= cache->sectors_per_block_shift; in get_bio_block()
787 static bool accountable_bio(struct cache *cache, struct bio *bio) in accountable_bio() argument
792 static void accounted_begin(struct cache *cache, struct bio *bio) in accounted_begin() argument
796 if (accountable_bio(cache, bio)) { in accounted_begin()
798 pb->len = bio_sectors(bio); in accounted_begin()
799 dm_iot_io_begin(&cache->tracker, pb->len); in accounted_begin()
803 static void accounted_complete(struct cache *cache, struct bio *bio) in accounted_complete() argument
807 dm_iot_io_end(&cache->tracker, pb->len); in accounted_complete()
810 static void accounted_request(struct cache *cache, struct bio *bio) in accounted_request() argument
812 accounted_begin(cache, bio); in accounted_request()
818 struct cache *cache = context; in issue_op() local
820 accounted_request(cache, bio); in issue_op()
825 * to both the cache and origin devices. Clone the bio and send them in parallel.
827 static void remap_to_origin_and_cache(struct cache *cache, struct bio *bio, in remap_to_origin_and_cache() argument
830 struct bio *origin_bio = bio_alloc_clone(cache->origin_dev->bdev, bio, in remap_to_origin_and_cache()
831 GFP_NOIO, &cache->bs); in remap_to_origin_and_cache()
838 clear_discard(cache, oblock_to_dblock(cache, oblock)); in remap_to_origin_and_cache()
841 remap_to_cache(cache, bio, cblock); in remap_to_origin_and_cache()
845 *--------------------------------------------------------------
847 *--------------------------------------------------------------
849 static enum cache_metadata_mode get_cache_mode(struct cache *cache) in get_cache_mode() argument
851 return cache->features.mode; in get_cache_mode()
854 static const char *cache_device_name(struct cache *cache) in cache_device_name() argument
856 return dm_table_device_name(cache->ti->table); in cache_device_name()
859 static void notify_mode_switch(struct cache *cache, enum cache_metadata_mode mode) in notify_mode_switch() argument
863 "read-only", in notify_mode_switch()
867 dm_table_event(cache->ti->table); in notify_mode_switch()
868 DMINFO("%s: switching cache to %s mode", in notify_mode_switch()
869 cache_device_name(cache), descs[(int)mode]); in notify_mode_switch()
872 static void set_cache_mode(struct cache *cache, enum cache_metadata_mode new_mode) in set_cache_mode() argument
875 enum cache_metadata_mode old_mode = get_cache_mode(cache); in set_cache_mode()
877 if (dm_cache_metadata_needs_check(cache->cmd, &needs_check)) { in set_cache_mode()
879 cache_device_name(cache)); in set_cache_mode()
884 DMERR("%s: unable to switch cache to write mode until repaired.", in set_cache_mode()
885 cache_device_name(cache)); in set_cache_mode()
899 dm_cache_metadata_set_read_only(cache->cmd); in set_cache_mode()
903 dm_cache_metadata_set_read_write(cache->cmd); in set_cache_mode()
907 cache->features.mode = new_mode; in set_cache_mode()
910 notify_mode_switch(cache, new_mode); in set_cache_mode()
913 static void abort_transaction(struct cache *cache) in abort_transaction() argument
915 const char *dev_name = cache_device_name(cache); in abort_transaction()
917 if (get_cache_mode(cache) >= CM_READ_ONLY) in abort_transaction()
921 if (dm_cache_metadata_abort(cache->cmd)) { in abort_transaction()
923 set_cache_mode(cache, CM_FAIL); in abort_transaction()
926 if (dm_cache_metadata_set_needs_check(cache->cmd)) { in abort_transaction()
928 set_cache_mode(cache, CM_FAIL); in abort_transaction()
932 static void metadata_operation_failed(struct cache *cache, const char *op, int r) in metadata_operation_failed() argument
935 cache_device_name(cache), op, r); in metadata_operation_failed()
936 abort_transaction(cache); in metadata_operation_failed()
937 set_cache_mode(cache, CM_READ_ONLY); in metadata_operation_failed()
940 /*----------------------------------------------------------------*/
942 static void load_stats(struct cache *cache) in load_stats() argument
946 dm_cache_metadata_get_stats(cache->cmd, &stats); in load_stats()
947 atomic_set(&cache->stats.read_hit, stats.read_hits); in load_stats()
948 atomic_set(&cache->stats.read_miss, stats.read_misses); in load_stats()
949 atomic_set(&cache->stats.write_hit, stats.write_hits); in load_stats()
950 atomic_set(&cache->stats.write_miss, stats.write_misses); in load_stats()
953 static void save_stats(struct cache *cache) in save_stats() argument
957 if (get_cache_mode(cache) >= CM_READ_ONLY) in save_stats()
960 stats.read_hits = atomic_read(&cache->stats.read_hit); in save_stats()
961 stats.read_misses = atomic_read(&cache->stats.read_miss); in save_stats()
962 stats.write_hits = atomic_read(&cache->stats.write_hit); in save_stats()
963 stats.write_misses = atomic_read(&cache->stats.write_miss); in save_stats()
965 dm_cache_metadata_set_stats(cache->cmd, &stats); in save_stats()
972 atomic_inc(&stats->promotion); in update_stats()
976 atomic_inc(&stats->demotion); in update_stats()
980 atomic_inc(&stats->writeback); in update_stats()
986 *---------------------------------------------------------------------
989 * Migration covers moving data from the origin device to the cache, or
991 *---------------------------------------------------------------------
993 static void inc_io_migrations(struct cache *cache) in inc_io_migrations() argument
995 atomic_inc(&cache->nr_io_migrations); in inc_io_migrations()
998 static void dec_io_migrations(struct cache *cache) in dec_io_migrations() argument
1000 atomic_dec(&cache->nr_io_migrations); in dec_io_migrations()
1005 return bio_op(bio) == REQ_OP_DISCARD || op_is_flush(bio->bi_opf); in discard_or_flush()
1008 static void calc_discard_block_range(struct cache *cache, struct bio *bio, in calc_discard_block_range() argument
1011 sector_t sb = bio->bi_iter.bi_sector; in calc_discard_block_range()
1014 *b = to_dblock(dm_sector_div_up(sb, cache->discard_block_size)); in calc_discard_block_range()
1016 if (se - sb < cache->discard_block_size) in calc_discard_block_range()
1019 *e = to_dblock(block_div(se, cache->discard_block_size)); in calc_discard_block_range()
1022 /*----------------------------------------------------------------*/
1024 static void prevent_background_work(struct cache *cache) in prevent_background_work() argument
1027 down_write(&cache->background_work_lock); in prevent_background_work()
1031 static void allow_background_work(struct cache *cache) in allow_background_work() argument
1034 up_write(&cache->background_work_lock); in allow_background_work()
1038 static bool background_work_begin(struct cache *cache) in background_work_begin() argument
1043 r = down_read_trylock(&cache->background_work_lock); in background_work_begin()
1049 static void background_work_end(struct cache *cache) in background_work_end() argument
1052 up_read(&cache->background_work_lock); in background_work_end()
1056 /*----------------------------------------------------------------*/
1058 static bool bio_writes_complete_block(struct cache *cache, struct bio *bio) in bio_writes_complete_block() argument
1061 (bio->bi_iter.bi_size == (cache->sectors_per_block << SECTOR_SHIFT)); in bio_writes_complete_block()
1064 static bool optimisable_bio(struct cache *cache, struct bio *bio, dm_oblock_t block) in optimisable_bio() argument
1066 return writeback_mode(cache) && in optimisable_bio()
1067 (is_discarded_oblock(cache, block) || bio_writes_complete_block(cache, bio)); in optimisable_bio()
1073 init_continuation(&mg->k, continuation); in quiesce()
1074 dm_cell_quiesce_v2(mg->cache->prison, mg->cell, &mg->k.ws); in quiesce()
1089 mg->k.input = BLK_STS_IOERR; in copy_complete()
1091 queue_continuation(mg->cache->wq, &mg->k); in copy_complete()
1097 struct cache *cache = mg->cache; in copy() local
1099 o_region.bdev = cache->origin_dev->bdev; in copy()
1100 o_region.sector = from_oblock(mg->op->oblock) * cache->sectors_per_block; in copy()
1101 o_region.count = cache->sectors_per_block; in copy()
1103 c_region.bdev = cache->cache_dev->bdev; in copy()
1104 c_region.sector = from_cblock(mg->op->cblock) * cache->sectors_per_block; in copy()
1105 c_region.count = cache->sectors_per_block; in copy()
1108 dm_kcopyd_copy(cache->copier, &o_region, 1, &c_region, 0, copy_complete, &mg->k); in copy()
1110 dm_kcopyd_copy(cache->copier, &c_region, 1, &o_region, 0, copy_complete, &mg->k); in copy()
1113 static void bio_drop_shared_lock(struct cache *cache, struct bio *bio) in bio_drop_shared_lock() argument
1117 if (pb->cell && dm_cell_put_v2(cache->prison, pb->cell)) in bio_drop_shared_lock()
1118 free_prison_cell(cache, pb->cell); in bio_drop_shared_lock()
1119 pb->cell = NULL; in bio_drop_shared_lock()
1124 struct dm_cache_migration *mg = bio->bi_private; in overwrite_endio()
1125 struct cache *cache = mg->cache; in overwrite_endio() local
1128 dm_unhook_bio(&pb->hook_info, bio); in overwrite_endio()
1130 if (bio->bi_status) in overwrite_endio()
1131 mg->k.input = bio->bi_status; in overwrite_endio()
1133 queue_continuation(cache->wq, &mg->k); in overwrite_endio()
1139 struct bio *bio = mg->overwrite_bio; in overwrite()
1142 dm_hook_bio(&pb->hook_info, bio, overwrite_endio, mg); in overwrite()
1148 if (mg->op->op == POLICY_PROMOTE) in overwrite()
1149 remap_to_cache(mg->cache, bio, mg->op->cblock); in overwrite()
1151 remap_to_origin(mg->cache, bio); in overwrite()
1153 init_continuation(&mg->k, continuation); in overwrite()
1154 accounted_request(mg->cache, bio); in overwrite()
1171 struct cache *cache = mg->cache; in mg_complete() local
1172 struct policy_work *op = mg->op; in mg_complete()
1173 dm_cblock_t cblock = op->cblock; in mg_complete()
1176 update_stats(&cache->stats, op->op); in mg_complete()
1178 switch (op->op) { in mg_complete()
1180 clear_discard(cache, oblock_to_dblock(cache, op->oblock)); in mg_complete()
1181 policy_complete_background_work(cache->policy, op, success); in mg_complete()
1183 if (mg->overwrite_bio) { in mg_complete()
1185 force_set_dirty(cache, cblock); in mg_complete()
1186 else if (mg->k.input) in mg_complete()
1187 mg->overwrite_bio->bi_status = mg->k.input; in mg_complete()
1189 mg->overwrite_bio->bi_status = BLK_STS_IOERR; in mg_complete()
1190 bio_endio(mg->overwrite_bio); in mg_complete()
1193 force_clear_dirty(cache, cblock); in mg_complete()
1194 dec_io_migrations(cache); in mg_complete()
1203 force_clear_dirty(cache, cblock); in mg_complete()
1204 policy_complete_background_work(cache->policy, op, success); in mg_complete()
1205 dec_io_migrations(cache); in mg_complete()
1210 force_clear_dirty(cache, cblock); in mg_complete()
1211 policy_complete_background_work(cache->policy, op, success); in mg_complete()
1212 dec_io_migrations(cache); in mg_complete()
1217 if (mg->cell) { in mg_complete()
1218 if (dm_cell_unlock_v2(cache->prison, mg->cell, &bios)) in mg_complete()
1219 free_prison_cell(cache, mg->cell); in mg_complete()
1223 defer_bios(cache, &bios); in mg_complete()
1224 wake_migration_worker(cache); in mg_complete()
1226 background_work_end(cache); in mg_complete()
1233 mg_complete(mg, mg->k.input == 0); in mg_success()
1240 struct cache *cache = mg->cache; in mg_update_metadata() local
1241 struct policy_work *op = mg->op; in mg_update_metadata()
1243 switch (op->op) { in mg_update_metadata()
1245 r = dm_cache_insert_mapping(cache->cmd, op->cblock, op->oblock); in mg_update_metadata()
1248 cache_device_name(cache)); in mg_update_metadata()
1249 metadata_operation_failed(cache, "dm_cache_insert_mapping", r); in mg_update_metadata()
1258 r = dm_cache_remove_mapping(cache->cmd, op->cblock); in mg_update_metadata()
1261 cache_device_name(cache)); in mg_update_metadata()
1262 metadata_operation_failed(cache, "dm_cache_remove_mapping", r); in mg_update_metadata()
1273 * - vblock x in a cache block in mg_update_metadata()
1274 * - domotion occurs in mg_update_metadata()
1275 * - cache block gets reallocated and over written in mg_update_metadata()
1276 * - crash in mg_update_metadata()
1278 * When we recover, because there was no commit the cache will in mg_update_metadata()
1279 * rollback to having the data for vblock x in the cache block. in mg_update_metadata()
1280 * But the cache block has since been overwritten, so it'll end in mg_update_metadata()
1287 init_continuation(&mg->k, mg_success); in mg_update_metadata()
1288 continue_after_commit(&cache->committer, &mg->k); in mg_update_metadata()
1289 schedule_commit(&cache->committer); in mg_update_metadata()
1305 if (mg->k.input) in mg_update_metadata_after_copy()
1319 if (mg->k.input) in mg_upgrade_lock()
1326 r = dm_cell_lock_promote_v2(mg->cache->prison, mg->cell, in mg_upgrade_lock()
1342 struct cache *cache = mg->cache; in mg_full_copy() local
1343 struct policy_work *op = mg->op; in mg_full_copy()
1344 bool is_policy_promote = (op->op == POLICY_PROMOTE); in mg_full_copy()
1346 if ((!is_policy_promote && !is_dirty(cache, op->cblock)) || in mg_full_copy()
1347 is_discarded_oblock(cache, op->oblock)) { in mg_full_copy()
1352 init_continuation(&mg->k, mg_upgrade_lock); in mg_full_copy()
1360 if (mg->overwrite_bio) { in mg_copy()
1364 * have changed (eg, the block may no longer be discarded). in mg_copy()
1366 if (!optimisable_bio(mg->cache, mg->overwrite_bio, mg->op->oblock)) { in mg_copy()
1370 bool rb = bio_detain_shared(mg->cache, mg->op->oblock, mg->overwrite_bio); in mg_copy()
1372 BUG_ON(rb); /* An exclusive lock must _not_ be held for this block */ in mg_copy()
1373 mg->overwrite_bio = NULL; in mg_copy()
1374 inc_io_migrations(mg->cache); in mg_copy()
1381 * because all IO has been locked out of the block. in mg_copy()
1396 struct cache *cache = mg->cache; in mg_lock_writes() local
1399 prealloc = alloc_prison_cell(cache); in mg_lock_writes()
1402 * Prevent writes to the block, but allow reads to continue. in mg_lock_writes()
1406 build_key(mg->op->oblock, oblock_succ(mg->op->oblock), &key); in mg_lock_writes()
1407 r = dm_cell_lock_v2(cache->prison, &key, in mg_lock_writes()
1408 mg->overwrite_bio ? READ_WRITE_LOCK_LEVEL : WRITE_LOCK_LEVEL, in mg_lock_writes()
1409 prealloc, &mg->cell); in mg_lock_writes()
1411 free_prison_cell(cache, prealloc); in mg_lock_writes()
1416 if (mg->cell != prealloc) in mg_lock_writes()
1417 free_prison_cell(cache, prealloc); in mg_lock_writes()
1420 mg_copy(&mg->k.ws); in mg_lock_writes()
1427 static int mg_start(struct cache *cache, struct policy_work *op, struct bio *bio) in mg_start() argument
1431 if (!background_work_begin(cache)) { in mg_start()
1432 policy_complete_background_work(cache->policy, op, false); in mg_start()
1433 return -EPERM; in mg_start()
1436 mg = alloc_migration(cache); in mg_start()
1438 mg->op = op; in mg_start()
1439 mg->overwrite_bio = bio; in mg_start()
1442 inc_io_migrations(cache); in mg_start()
1448 *--------------------------------------------------------------
1450 *--------------------------------------------------------------
1456 struct cache *cache = mg->cache; in invalidate_complete() local
1459 if (dm_cell_unlock_v2(cache->prison, mg->cell, &bios)) in invalidate_complete()
1460 free_prison_cell(cache, mg->cell); in invalidate_complete()
1462 if (!success && mg->overwrite_bio) in invalidate_complete()
1463 bio_io_error(mg->overwrite_bio); in invalidate_complete()
1466 defer_bios(cache, &bios); in invalidate_complete()
1468 background_work_end(cache); in invalidate_complete()
1475 invalidate_complete(mg, !mg->k.input); in invalidate_completed()
1478 static int invalidate_cblock(struct cache *cache, dm_cblock_t cblock) in invalidate_cblock() argument
1482 r = policy_invalidate_mapping(cache->policy, cblock); in invalidate_cblock()
1484 r = dm_cache_remove_mapping(cache->cmd, cblock); in invalidate_cblock()
1487 cache_device_name(cache)); in invalidate_cblock()
1488 metadata_operation_failed(cache, "dm_cache_remove_mapping", r); in invalidate_cblock()
1491 } else if (r == -ENODATA) { in invalidate_cblock()
1498 DMERR("%s: policy_invalidate_mapping failed", cache_device_name(cache)); in invalidate_cblock()
1507 struct cache *cache = mg->cache; in invalidate_remove() local
1509 r = invalidate_cblock(cache, mg->invalidate_cblock); in invalidate_remove()
1515 init_continuation(&mg->k, invalidate_completed); in invalidate_remove()
1516 continue_after_commit(&cache->committer, &mg->k); in invalidate_remove()
1517 remap_to_origin_clear_discard(cache, mg->overwrite_bio, mg->invalidate_oblock); in invalidate_remove()
1518 mg->overwrite_bio = NULL; in invalidate_remove()
1519 schedule_commit(&cache->committer); in invalidate_remove()
1526 struct cache *cache = mg->cache; in invalidate_lock() local
1529 prealloc = alloc_prison_cell(cache); in invalidate_lock()
1531 build_key(mg->invalidate_oblock, oblock_succ(mg->invalidate_oblock), &key); in invalidate_lock()
1532 r = dm_cell_lock_v2(cache->prison, &key, in invalidate_lock()
1533 READ_WRITE_LOCK_LEVEL, prealloc, &mg->cell); in invalidate_lock()
1535 free_prison_cell(cache, prealloc); in invalidate_lock()
1540 if (mg->cell != prealloc) in invalidate_lock()
1541 free_prison_cell(cache, prealloc); in invalidate_lock()
1551 init_continuation(&mg->k, invalidate_remove); in invalidate_lock()
1552 queue_work(cache->wq, &mg->k.ws); in invalidate_lock()
1558 static int invalidate_start(struct cache *cache, dm_cblock_t cblock, in invalidate_start() argument
1563 if (!background_work_begin(cache)) in invalidate_start()
1564 return -EPERM; in invalidate_start()
1566 mg = alloc_migration(cache); in invalidate_start()
1568 mg->overwrite_bio = bio; in invalidate_start()
1569 mg->invalidate_cblock = cblock; in invalidate_start()
1570 mg->invalidate_oblock = oblock; in invalidate_start()
1576 *--------------------------------------------------------------
1578 *--------------------------------------------------------------
1586 static enum busy spare_migration_bandwidth(struct cache *cache) in spare_migration_bandwidth() argument
1588 bool idle = dm_iot_idle_for(&cache->tracker, HZ); in spare_migration_bandwidth()
1589 sector_t current_volume = (atomic_read(&cache->nr_io_migrations) + 1) * in spare_migration_bandwidth()
1590 cache->sectors_per_block; in spare_migration_bandwidth()
1592 if (idle && current_volume <= cache->migration_threshold) in spare_migration_bandwidth()
1598 static void inc_hit_counter(struct cache *cache, struct bio *bio) in inc_hit_counter() argument
1601 &cache->stats.read_hit : &cache->stats.write_hit); in inc_hit_counter()
1604 static void inc_miss_counter(struct cache *cache, struct bio *bio) in inc_miss_counter() argument
1607 &cache->stats.read_miss : &cache->stats.write_miss); in inc_miss_counter()
1610 /*----------------------------------------------------------------*/
1612 static int map_bio(struct cache *cache, struct bio *bio, dm_oblock_t block, in map_bio() argument
1621 rb = bio_detain_shared(cache, block, bio); in map_bio()
1624 * An exclusive lock is held for this block, so we have to in map_bio()
1635 if (optimisable_bio(cache, bio, block)) { in map_bio()
1638 r = policy_lookup_with_work(cache->policy, block, &cblock, data_dir, true, &op); in map_bio()
1639 if (unlikely(r && r != -ENOENT)) { in map_bio()
1641 cache_device_name(cache), r); in map_bio()
1646 if (r == -ENOENT && op) { in map_bio()
1647 bio_drop_shared_lock(cache, bio); in map_bio()
1648 BUG_ON(op->op != POLICY_PROMOTE); in map_bio()
1649 mg_start(cache, op, bio); in map_bio()
1653 r = policy_lookup(cache->policy, block, &cblock, data_dir, false, &background_queued); in map_bio()
1654 if (unlikely(r && r != -ENOENT)) { in map_bio()
1656 cache_device_name(cache), r); in map_bio()
1662 wake_migration_worker(cache); in map_bio()
1665 if (r == -ENOENT) { in map_bio()
1671 inc_miss_counter(cache, bio); in map_bio()
1672 if (pb->req_nr == 0) { in map_bio()
1673 accounted_begin(cache, bio); in map_bio()
1674 remap_to_origin_clear_discard(cache, bio, block); in map_bio()
1678 * longer needed because the block has been demoted. in map_bio()
1687 inc_hit_counter(cache, bio); in map_bio()
1691 * cache blocks that are written to. in map_bio()
1693 if (passthrough_mode(cache)) { in map_bio()
1695 bio_drop_shared_lock(cache, bio); in map_bio()
1696 atomic_inc(&cache->stats.demotion); in map_bio()
1697 invalidate_start(cache, cblock, block, bio); in map_bio()
1699 remap_to_origin_clear_discard(cache, bio, block); in map_bio()
1701 if (bio_data_dir(bio) == WRITE && writethrough_mode(cache) && in map_bio()
1702 !is_dirty(cache, cblock)) { in map_bio()
1703 remap_to_origin_and_cache(cache, bio, block, cblock); in map_bio()
1704 accounted_begin(cache, bio); in map_bio()
1706 remap_to_cache_dirty(cache, bio, block, cblock); in map_bio()
1713 if (bio->bi_opf & REQ_FUA) { in map_bio()
1718 accounted_complete(cache, bio); in map_bio()
1719 issue_after_commit(&cache->committer, bio); in map_bio()
1727 static bool process_bio(struct cache *cache, struct bio *bio) in process_bio() argument
1731 if (map_bio(cache, bio, get_bio_block(cache, bio), &commit_needed) == DM_MAPIO_REMAPPED) in process_bio()
1738 * A non-zero return indicates read_only or fail_io mode.
1740 static int commit(struct cache *cache, bool clean_shutdown) in commit() argument
1744 if (get_cache_mode(cache) >= CM_READ_ONLY) in commit()
1745 return -EINVAL; in commit()
1747 atomic_inc(&cache->stats.commit_count); in commit()
1748 r = dm_cache_commit(cache->cmd, clean_shutdown); in commit()
1750 metadata_operation_failed(cache, "dm_cache_commit", r); in commit()
1760 struct cache *cache = context; in commit_op() local
1762 if (dm_cache_changed_this_transaction(cache->cmd)) in commit_op()
1763 return errno_to_blk_status(commit(cache, false)); in commit_op()
1768 /*----------------------------------------------------------------*/
1770 static bool process_flush_bio(struct cache *cache, struct bio *bio) in process_flush_bio() argument
1774 if (!pb->req_nr) in process_flush_bio()
1775 remap_to_origin(cache, bio); in process_flush_bio()
1777 remap_to_cache(cache, bio, 0); in process_flush_bio()
1779 issue_after_commit(&cache->committer, bio); in process_flush_bio()
1783 static bool process_discard_bio(struct cache *cache, struct bio *bio) in process_discard_bio() argument
1792 calc_discard_block_range(cache, bio, &b, &e); in process_discard_bio()
1794 set_discard(cache, b); in process_discard_bio()
1798 if (cache->features.discard_passdown) { in process_discard_bio()
1799 remap_to_origin(cache, bio); in process_discard_bio()
1809 struct cache *cache = container_of(ws, struct cache, deferred_bio_worker); in process_deferred_bios() local
1817 spin_lock_irq(&cache->lock); in process_deferred_bios()
1818 bio_list_merge_init(&bios, &cache->deferred_bios); in process_deferred_bios()
1819 spin_unlock_irq(&cache->lock); in process_deferred_bios()
1822 if (bio->bi_opf & REQ_PREFLUSH) in process_deferred_bios()
1823 commit_needed = process_flush_bio(cache, bio) || commit_needed; in process_deferred_bios()
1826 commit_needed = process_discard_bio(cache, bio) || commit_needed; in process_deferred_bios()
1829 commit_needed = process_bio(cache, bio) || commit_needed; in process_deferred_bios()
1834 schedule_commit(&cache->committer); in process_deferred_bios()
1838 *--------------------------------------------------------------
1840 *--------------------------------------------------------------
1842 static void requeue_deferred_bios(struct cache *cache) in requeue_deferred_bios() argument
1848 bio_list_merge_init(&bios, &cache->deferred_bios); in requeue_deferred_bios()
1851 bio->bi_status = BLK_STS_DM_REQUEUE; in requeue_deferred_bios()
1863 struct cache *cache = container_of(to_delayed_work(ws), struct cache, waker); in do_waker() local
1865 policy_tick(cache->policy, true); in do_waker()
1866 wake_migration_worker(cache); in do_waker()
1867 schedule_commit(&cache->committer); in do_waker()
1868 queue_delayed_work(cache->wq, &cache->waker, COMMIT_PERIOD); in do_waker()
1875 struct cache *cache = container_of(ws, struct cache, migration_worker); in check_migrations() local
1879 b = spare_migration_bandwidth(cache); in check_migrations()
1881 r = policy_get_background_work(cache->policy, b == IDLE, &op); in check_migrations()
1882 if (r == -ENODATA) in check_migrations()
1887 cache_device_name(cache)); in check_migrations()
1891 r = mg_start(cache, op, NULL); in check_migrations()
1900 *--------------------------------------------------------------
1902 *--------------------------------------------------------------
1909 static void __destroy(struct cache *cache) in __destroy() argument
1911 mempool_exit(&cache->migration_pool); in __destroy()
1913 if (cache->prison) in __destroy()
1914 dm_bio_prison_destroy_v2(cache->prison); in __destroy()
1916 if (cache->wq) in __destroy()
1917 destroy_workqueue(cache->wq); in __destroy()
1919 if (cache->dirty_bitset) in __destroy()
1920 free_bitset(cache->dirty_bitset); in __destroy()
1922 if (cache->discard_bitset) in __destroy()
1923 free_bitset(cache->discard_bitset); in __destroy()
1925 if (cache->copier) in __destroy()
1926 dm_kcopyd_client_destroy(cache->copier); in __destroy()
1928 if (cache->cmd) in __destroy()
1929 dm_cache_metadata_close(cache->cmd); in __destroy()
1931 if (cache->metadata_dev) in __destroy()
1932 dm_put_device(cache->ti, cache->metadata_dev); in __destroy()
1934 if (cache->origin_dev) in __destroy()
1935 dm_put_device(cache->ti, cache->origin_dev); in __destroy()
1937 if (cache->cache_dev) in __destroy()
1938 dm_put_device(cache->ti, cache->cache_dev); in __destroy()
1940 if (cache->policy) in __destroy()
1941 dm_cache_policy_destroy(cache->policy); in __destroy()
1943 bioset_exit(&cache->bs); in __destroy()
1945 kfree(cache); in __destroy()
1948 static void destroy(struct cache *cache) in destroy() argument
1952 cancel_delayed_work_sync(&cache->waker); in destroy()
1954 for (i = 0; i < cache->nr_ctr_args ; i++) in destroy()
1955 kfree(cache->ctr_args[i]); in destroy()
1956 kfree(cache->ctr_args); in destroy()
1958 __destroy(cache); in destroy()
1963 struct cache *cache = ti->private; in cache_dtr() local
1965 destroy(cache); in cache_dtr()
1970 return bdev_nr_sectors(dev->bdev); in get_dev_size()
1973 /*----------------------------------------------------------------*/
1976 * Construct a cache device mapping.
1978 * cache <metadata dev> <cache dev> <origin dev> <block size>
1983 * cache dev : fast device holding cached data blocks
1985 * block size : cache unit size in sectors
1995 * See cache-policies.txt for details.
1998 * writethrough : write through caching that prohibits cache block
1999 * content from being different from origin block content.
2001 * back cache block contents later for performance reasons,
2025 if (ca->metadata_dev) in destroy_cache_args()
2026 dm_put_device(ca->ti, ca->metadata_dev); in destroy_cache_args()
2028 if (ca->cache_dev) in destroy_cache_args()
2029 dm_put_device(ca->ti, ca->cache_dev); in destroy_cache_args()
2031 if (ca->origin_dev) in destroy_cache_args()
2032 dm_put_device(ca->ti, ca->origin_dev); in destroy_cache_args()
2039 if (!as->argc) { in at_least_one_arg()
2054 return -EINVAL; in parse_metadata_dev()
2056 r = dm_get_device(ca->ti, dm_shift_arg(as), in parse_metadata_dev()
2057 BLK_OPEN_READ | BLK_OPEN_WRITE, &ca->metadata_dev); in parse_metadata_dev()
2063 metadata_dev_size = get_dev_size(ca->metadata_dev); in parse_metadata_dev()
2066 ca->metadata_dev->bdev, THIN_METADATA_MAX_SECTORS); in parse_metadata_dev()
2077 return -EINVAL; in parse_cache_dev()
2079 r = dm_get_device(ca->ti, dm_shift_arg(as), in parse_cache_dev()
2080 BLK_OPEN_READ | BLK_OPEN_WRITE, &ca->cache_dev); in parse_cache_dev()
2082 *error = "Error opening cache device"; in parse_cache_dev()
2085 ca->cache_sectors = get_dev_size(ca->cache_dev); in parse_cache_dev()
2097 return -EINVAL; in parse_origin_dev()
2099 r = dm_get_device(ca->ti, dm_shift_arg(as), in parse_origin_dev()
2100 BLK_OPEN_READ | BLK_OPEN_WRITE, &ca->origin_dev); in parse_origin_dev()
2106 origin_sectors = get_dev_size(ca->origin_dev); in parse_origin_dev()
2107 if (ca->ti->len > origin_sectors) { in parse_origin_dev()
2109 return -EINVAL; in parse_origin_dev()
2121 return -EINVAL; in parse_block_size()
2126 block_size & (DATA_DEV_BLOCK_SIZE_MIN_SECTORS - 1)) { in parse_block_size()
2127 *error = "Invalid data block size"; in parse_block_size()
2128 return -EINVAL; in parse_block_size()
2131 if (block_size > ca->cache_sectors) { in parse_block_size()
2132 *error = "Data block size is larger than the cache device"; in parse_block_size()
2133 return -EINVAL; in parse_block_size()
2136 ca->block_size = block_size; in parse_block_size()
2143 cf->mode = CM_WRITE; in init_features()
2144 cf->io_mode = CM_IO_WRITEBACK; in init_features()
2145 cf->metadata_version = 1; in init_features()
2146 cf->discard_passdown = true; in init_features()
2153 {0, 3, "Invalid number of cache feature arguments"}, in parse_features()
2159 struct cache_features *cf = &ca->features; in parse_features()
2165 return -EINVAL; in parse_features()
2167 while (argc--) { in parse_features()
2171 cf->io_mode = CM_IO_WRITEBACK; in parse_features()
2176 cf->io_mode = CM_IO_WRITETHROUGH; in parse_features()
2181 cf->io_mode = CM_IO_PASSTHROUGH; in parse_features()
2186 cf->metadata_version = 2; in parse_features()
2189 cf->discard_passdown = false; in parse_features()
2192 *error = "Unrecognised cache feature requested"; in parse_features()
2193 return -EINVAL; in parse_features()
2198 *error = "Duplicate cache io_mode features requested"; in parse_features()
2199 return -EINVAL; in parse_features()
2215 return -EINVAL; in parse_policy()
2217 ca->policy_name = dm_shift_arg(as); in parse_policy()
2219 r = dm_read_arg_group(_args, as, &ca->policy_argc, error); in parse_policy()
2221 return -EINVAL; in parse_policy()
2223 ca->policy_argv = (const char **)as->argv; in parse_policy()
2224 dm_consume_args(as, ca->policy_argc); in parse_policy()
2265 /*----------------------------------------------------------------*/
2271 static int process_config_option(struct cache *cache, const char *key, const char *value) in process_config_option() argument
2277 return -EINVAL; in process_config_option()
2279 cache->migration_threshold = tmp; in process_config_option()
2286 static int set_config_value(struct cache *cache, const char *key, const char *value) in set_config_value() argument
2288 int r = process_config_option(cache, key, value); in set_config_value()
2291 r = policy_set_config_value(cache->policy, key, value); in set_config_value()
2299 static int set_config_values(struct cache *cache, int argc, const char **argv) in set_config_values() argument
2305 return -EINVAL; in set_config_values()
2309 r = set_config_value(cache, argv[0], argv[1]); in set_config_values()
2313 argc -= 2; in set_config_values()
2320 static int create_cache_policy(struct cache *cache, struct cache_args *ca, in create_cache_policy() argument
2323 struct dm_cache_policy *p = dm_cache_policy_create(ca->policy_name, in create_cache_policy()
2324 cache->cache_size, in create_cache_policy()
2325 cache->origin_sectors, in create_cache_policy()
2326 cache->sectors_per_block); in create_cache_policy()
2328 *error = "Error creating cache's policy"; in create_cache_policy()
2331 cache->policy = p; in create_cache_policy()
2332 BUG_ON(!cache->policy); in create_cache_policy()
2338 * We want the discard block size to be at least the size of the cache
2339 * block size and have no more than 2^14 discard blocks across the origin.
2363 static void set_cache_size(struct cache *cache, dm_cblock_t size) in set_cache_size() argument
2367 if (nr_blocks > (1 << 20) && cache->cache_size != size) in set_cache_size()
2368 DMWARN_LIMIT("You have created a cache device with a lot of individual cache blocks (%llu)\n" in set_cache_size()
2370 "Please consider increasing the cache block size to reduce the overall cache block count.", in set_cache_size()
2373 cache->cache_size = size; in set_cache_size()
2378 static int cache_create(struct cache_args *ca, struct cache **result) in cache_create()
2381 char **error = &ca->ti->error; in cache_create()
2382 struct cache *cache; in cache_create() local
2383 struct dm_target *ti = ca->ti; in cache_create()
2386 bool may_format = ca->features.mode == CM_WRITE; in cache_create()
2388 cache = kzalloc(sizeof(*cache), GFP_KERNEL); in cache_create()
2389 if (!cache) in cache_create()
2390 return -ENOMEM; in cache_create()
2392 cache->ti = ca->ti; in cache_create()
2393 ti->private = cache; in cache_create()
2394 ti->accounts_remapped_io = true; in cache_create()
2395 ti->num_flush_bios = 2; in cache_create()
2396 ti->flush_supported = true; in cache_create()
2398 ti->num_discard_bios = 1; in cache_create()
2399 ti->discards_supported = true; in cache_create()
2401 ti->per_io_data_size = sizeof(struct per_bio_data); in cache_create()
2403 cache->features = ca->features; in cache_create()
2404 if (writethrough_mode(cache)) { in cache_create()
2406 r = bioset_init(&cache->bs, BIO_POOL_SIZE, 0, 0); in cache_create()
2411 cache->metadata_dev = ca->metadata_dev; in cache_create()
2412 cache->origin_dev = ca->origin_dev; in cache_create()
2413 cache->cache_dev = ca->cache_dev; in cache_create()
2415 ca->metadata_dev = ca->origin_dev = ca->cache_dev = NULL; in cache_create()
2417 origin_blocks = cache->origin_sectors = ti->len; in cache_create()
2418 origin_blocks = block_div(origin_blocks, ca->block_size); in cache_create()
2419 cache->origin_blocks = to_oblock(origin_blocks); in cache_create()
2421 cache->sectors_per_block = ca->block_size; in cache_create()
2422 if (dm_set_target_max_io_len(ti, cache->sectors_per_block)) { in cache_create()
2423 r = -EINVAL; in cache_create()
2427 if (ca->block_size & (ca->block_size - 1)) { in cache_create()
2428 dm_block_t cache_size = ca->cache_sectors; in cache_create()
2430 cache->sectors_per_block_shift = -1; in cache_create()
2431 cache_size = block_div(cache_size, ca->block_size); in cache_create()
2432 set_cache_size(cache, to_cblock(cache_size)); in cache_create()
2434 cache->sectors_per_block_shift = __ffs(ca->block_size); in cache_create()
2435 set_cache_size(cache, to_cblock(ca->cache_sectors >> cache->sectors_per_block_shift)); in cache_create()
2438 r = create_cache_policy(cache, ca, error); in cache_create()
2442 cache->policy_nr_args = ca->policy_argc; in cache_create()
2443 cache->migration_threshold = DEFAULT_MIGRATION_THRESHOLD; in cache_create()
2445 r = set_config_values(cache, ca->policy_argc, ca->policy_argv); in cache_create()
2447 *error = "Error setting cache policy's config values"; in cache_create()
2451 cmd = dm_cache_metadata_open(cache->metadata_dev->bdev, in cache_create()
2452 ca->block_size, may_format, in cache_create()
2453 dm_cache_policy_get_hint_size(cache->policy), in cache_create()
2454 ca->features.metadata_version); in cache_create()
2460 cache->cmd = cmd; in cache_create()
2461 set_cache_mode(cache, CM_WRITE); in cache_create()
2462 if (get_cache_mode(cache) != CM_WRITE) { in cache_create()
2464 r = -EINVAL; in cache_create()
2468 if (passthrough_mode(cache)) { in cache_create()
2471 r = dm_cache_metadata_all_clean(cache->cmd, &all_clean); in cache_create()
2479 r = -EINVAL; in cache_create()
2483 policy_allow_migrations(cache->policy, false); in cache_create()
2486 spin_lock_init(&cache->lock); in cache_create()
2487 bio_list_init(&cache->deferred_bios); in cache_create()
2488 atomic_set(&cache->nr_allocated_migrations, 0); in cache_create()
2489 atomic_set(&cache->nr_io_migrations, 0); in cache_create()
2490 init_waitqueue_head(&cache->migration_wait); in cache_create()
2492 r = -ENOMEM; in cache_create()
2493 atomic_set(&cache->nr_dirty, 0); in cache_create()
2494 cache->dirty_bitset = alloc_bitset(from_cblock(cache->cache_size)); in cache_create()
2495 if (!cache->dirty_bitset) { in cache_create()
2499 clear_bitset(cache->dirty_bitset, from_cblock(cache->cache_size)); in cache_create()
2501 cache->discard_block_size = in cache_create()
2502 calculate_discard_block_size(cache->sectors_per_block, in cache_create()
2503 cache->origin_sectors); in cache_create()
2504 cache->discard_nr_blocks = to_dblock(dm_sector_div_up(cache->origin_sectors, in cache_create()
2505 cache->discard_block_size)); in cache_create()
2506 cache->discard_bitset = alloc_bitset(from_dblock(cache->discard_nr_blocks)); in cache_create()
2507 if (!cache->discard_bitset) { in cache_create()
2511 clear_bitset(cache->discard_bitset, from_dblock(cache->discard_nr_blocks)); in cache_create()
2513 cache->copier = dm_kcopyd_client_create(&dm_kcopyd_throttle); in cache_create()
2514 if (IS_ERR(cache->copier)) { in cache_create()
2516 r = PTR_ERR(cache->copier); in cache_create()
2520 cache->wq = alloc_workqueue("dm-" DM_MSG_PREFIX, WQ_MEM_RECLAIM, 0); in cache_create()
2521 if (!cache->wq) { in cache_create()
2525 INIT_WORK(&cache->deferred_bio_worker, process_deferred_bios); in cache_create()
2526 INIT_WORK(&cache->migration_worker, check_migrations); in cache_create()
2527 INIT_DELAYED_WORK(&cache->waker, do_waker); in cache_create()
2529 cache->prison = dm_bio_prison_create_v2(cache->wq); in cache_create()
2530 if (!cache->prison) { in cache_create()
2535 r = mempool_init_slab_pool(&cache->migration_pool, MIGRATION_POOL_SIZE, in cache_create()
2538 *error = "Error creating cache's migration mempool"; in cache_create()
2542 cache->need_tick_bio = true; in cache_create()
2543 cache->sized = false; in cache_create()
2544 cache->invalidate = false; in cache_create()
2545 cache->commit_requested = false; in cache_create()
2546 cache->loaded_mappings = false; in cache_create()
2547 cache->loaded_discards = false; in cache_create()
2549 load_stats(cache); in cache_create()
2551 atomic_set(&cache->stats.demotion, 0); in cache_create()
2552 atomic_set(&cache->stats.promotion, 0); in cache_create()
2553 atomic_set(&cache->stats.copies_avoided, 0); in cache_create()
2554 atomic_set(&cache->stats.cache_cell_clash, 0); in cache_create()
2555 atomic_set(&cache->stats.commit_count, 0); in cache_create()
2556 atomic_set(&cache->stats.discard_count, 0); in cache_create()
2558 spin_lock_init(&cache->invalidation_lock); in cache_create()
2559 INIT_LIST_HEAD(&cache->invalidation_requests); in cache_create()
2561 batcher_init(&cache->committer, commit_op, cache, in cache_create()
2562 issue_op, cache, cache->wq); in cache_create()
2563 dm_iot_init(&cache->tracker); in cache_create()
2565 init_rwsem(&cache->background_work_lock); in cache_create()
2566 prevent_background_work(cache); in cache_create()
2568 *result = cache; in cache_create()
2571 __destroy(cache); in cache_create()
2575 static int copy_ctr_args(struct cache *cache, int argc, const char **argv) in copy_ctr_args() argument
2582 return -ENOMEM; in copy_ctr_args()
2586 while (i--) in copy_ctr_args()
2589 return -ENOMEM; in copy_ctr_args()
2593 cache->nr_ctr_args = argc; in copy_ctr_args()
2594 cache->ctr_args = copy; in copy_ctr_args()
2601 int r = -EINVAL; in cache_ctr()
2603 struct cache *cache = NULL; in cache_ctr() local
2607 ti->error = "Error allocating memory for cache"; in cache_ctr()
2608 return -ENOMEM; in cache_ctr()
2610 ca->ti = ti; in cache_ctr()
2612 r = parse_cache_args(ca, argc, argv, &ti->error); in cache_ctr()
2616 r = cache_create(ca, &cache); in cache_ctr()
2620 r = copy_ctr_args(cache, argc - 3, (const char **)argv + 3); in cache_ctr()
2622 __destroy(cache); in cache_ctr()
2626 ti->private = cache; in cache_ctr()
2632 /*----------------------------------------------------------------*/
2636 struct cache *cache = ti->private; in cache_map() local
2640 dm_oblock_t block = get_bio_block(cache, bio); in cache_map() local
2643 if (unlikely(from_oblock(block) >= from_oblock(cache->origin_blocks))) { in cache_map()
2645 * This can only occur if the io goes to a partial block at in cache_map()
2646 * the end of the origin device. We don't cache these. in cache_map()
2649 remap_to_origin(cache, bio); in cache_map()
2650 accounted_begin(cache, bio); in cache_map()
2655 defer_bio(cache, bio); in cache_map()
2659 r = map_bio(cache, bio, block, &commit_needed); in cache_map()
2661 schedule_commit(&cache->committer); in cache_map()
2668 struct cache *cache = ti->private; in cache_end_io() local
2672 if (pb->tick) { in cache_end_io()
2673 policy_tick(cache->policy, false); in cache_end_io()
2675 spin_lock_irqsave(&cache->lock, flags); in cache_end_io()
2676 cache->need_tick_bio = true; in cache_end_io()
2677 spin_unlock_irqrestore(&cache->lock, flags); in cache_end_io()
2680 bio_drop_shared_lock(cache, bio); in cache_end_io()
2681 accounted_complete(cache, bio); in cache_end_io()
2686 static int write_dirty_bitset(struct cache *cache) in write_dirty_bitset() argument
2690 if (get_cache_mode(cache) >= CM_READ_ONLY) in write_dirty_bitset()
2691 return -EINVAL; in write_dirty_bitset()
2693 r = dm_cache_set_dirty_bits(cache->cmd, from_cblock(cache->cache_size), cache->dirty_bitset); in write_dirty_bitset()
2695 metadata_operation_failed(cache, "dm_cache_set_dirty_bits", r); in write_dirty_bitset()
2700 static int write_discard_bitset(struct cache *cache) in write_discard_bitset() argument
2704 if (get_cache_mode(cache) >= CM_READ_ONLY) in write_discard_bitset()
2705 return -EINVAL; in write_discard_bitset()
2707 r = dm_cache_discard_bitset_resize(cache->cmd, cache->discard_block_size, in write_discard_bitset()
2708 cache->discard_nr_blocks); in write_discard_bitset()
2710 DMERR("%s: could not resize on-disk discard bitset", cache_device_name(cache)); in write_discard_bitset()
2711 metadata_operation_failed(cache, "dm_cache_discard_bitset_resize", r); in write_discard_bitset()
2715 for (i = 0; i < from_dblock(cache->discard_nr_blocks); i++) { in write_discard_bitset()
2716 r = dm_cache_set_discard(cache->cmd, to_dblock(i), in write_discard_bitset()
2717 is_discarded(cache, to_dblock(i))); in write_discard_bitset()
2719 metadata_operation_failed(cache, "dm_cache_set_discard", r); in write_discard_bitset()
2727 static int write_hints(struct cache *cache) in write_hints() argument
2731 if (get_cache_mode(cache) >= CM_READ_ONLY) in write_hints()
2732 return -EINVAL; in write_hints()
2734 r = dm_cache_write_hints(cache->cmd, cache->policy); in write_hints()
2736 metadata_operation_failed(cache, "dm_cache_write_hints", r); in write_hints()
2746 static bool sync_metadata(struct cache *cache) in sync_metadata() argument
2750 r1 = write_dirty_bitset(cache); in sync_metadata()
2752 DMERR("%s: could not write dirty bitset", cache_device_name(cache)); in sync_metadata()
2754 r2 = write_discard_bitset(cache); in sync_metadata()
2756 DMERR("%s: could not write discard bitset", cache_device_name(cache)); in sync_metadata()
2758 save_stats(cache); in sync_metadata()
2760 r3 = write_hints(cache); in sync_metadata()
2762 DMERR("%s: could not write hints", cache_device_name(cache)); in sync_metadata()
2769 r4 = commit(cache, !r1 && !r2 && !r3); in sync_metadata()
2771 DMERR("%s: could not write cache metadata", cache_device_name(cache)); in sync_metadata()
2778 struct cache *cache = ti->private; in cache_postsuspend() local
2780 prevent_background_work(cache); in cache_postsuspend()
2781 BUG_ON(atomic_read(&cache->nr_io_migrations)); in cache_postsuspend()
2783 cancel_delayed_work_sync(&cache->waker); in cache_postsuspend()
2784 drain_workqueue(cache->wq); in cache_postsuspend()
2785 WARN_ON(cache->tracker.in_flight); in cache_postsuspend()
2791 requeue_deferred_bios(cache); in cache_postsuspend()
2793 if (get_cache_mode(cache) == CM_WRITE) in cache_postsuspend()
2794 (void) sync_metadata(cache); in cache_postsuspend()
2800 struct cache *cache = context; in load_mapping() local
2803 set_bit(from_cblock(cblock), cache->dirty_bitset); in load_mapping()
2804 atomic_inc(&cache->nr_dirty); in load_mapping()
2806 clear_bit(from_cblock(cblock), cache->dirty_bitset); in load_mapping()
2808 return policy_load_mapping(cache->policy, oblock, cblock, dirty, hint, hint_valid); in load_mapping()
2812 * The discard block size in the on disk metadata is not
2815 * covers a complete block of the new size.
2818 struct cache *cache; member
2828 static void discard_load_info_init(struct cache *cache, in discard_load_info_init() argument
2831 li->cache = cache; in discard_load_info_init()
2832 li->discard_begin = li->discard_end = 0; in discard_load_info_init()
2839 if (li->discard_begin == li->discard_end) in set_discard_range()
2845 b = li->discard_begin * li->block_size; in set_discard_range()
2846 e = li->discard_end * li->block_size; in set_discard_range()
2851 b = dm_sector_div_up(b, li->cache->discard_block_size); in set_discard_range()
2852 sector_div(e, li->cache->discard_block_size); in set_discard_range()
2858 if (e > from_dblock(li->cache->discard_nr_blocks)) in set_discard_range()
2859 e = from_dblock(li->cache->discard_nr_blocks); in set_discard_range()
2862 set_discard(li->cache, to_dblock(b)); in set_discard_range()
2870 li->block_size = discard_block_size; in load_discard()
2873 if (from_dblock(dblock) == li->discard_end) in load_discard()
2877 li->discard_end = li->discard_end + 1ULL; in load_discard()
2884 li->discard_begin = from_dblock(dblock); in load_discard()
2885 li->discard_end = li->discard_begin + 1ULL; in load_discard()
2889 li->discard_begin = li->discard_end = 0; in load_discard()
2895 static dm_cblock_t get_cache_dev_size(struct cache *cache) in get_cache_dev_size() argument
2897 sector_t size = get_dev_size(cache->cache_dev); in get_cache_dev_size()
2898 (void) sector_div(size, cache->sectors_per_block); in get_cache_dev_size()
2902 static bool can_resize(struct cache *cache, dm_cblock_t new_size) in can_resize() argument
2904 if (from_cblock(new_size) > from_cblock(cache->cache_size)) { in can_resize()
2905 DMERR("%s: unable to extend cache due to missing cache table reload", in can_resize()
2906 cache_device_name(cache)); in can_resize()
2911 * We can't drop a dirty block when shrinking the cache. in can_resize()
2913 if (cache->loaded_mappings) { in can_resize()
2914 new_size = to_cblock(find_next_bit(cache->dirty_bitset, in can_resize()
2915 from_cblock(cache->cache_size), in can_resize()
2917 if (new_size != cache->cache_size) { in can_resize()
2918 DMERR("%s: unable to shrink cache; cache block %llu is dirty", in can_resize()
2919 cache_device_name(cache), in can_resize()
2928 static int resize_cache_dev(struct cache *cache, dm_cblock_t new_size) in resize_cache_dev() argument
2932 r = dm_cache_resize(cache->cmd, new_size); in resize_cache_dev()
2934 DMERR("%s: could not resize cache metadata", cache_device_name(cache)); in resize_cache_dev()
2935 metadata_operation_failed(cache, "dm_cache_resize", r); in resize_cache_dev()
2939 set_cache_size(cache, new_size); in resize_cache_dev()
2947 struct cache *cache = ti->private; in cache_preresume() local
2948 dm_cblock_t csize = get_cache_dev_size(cache); in cache_preresume()
2951 * Check to see if the cache has resized. in cache_preresume()
2953 if (!cache->sized || csize != cache->cache_size) { in cache_preresume()
2954 if (!can_resize(cache, csize)) in cache_preresume()
2955 return -EINVAL; in cache_preresume()
2957 r = resize_cache_dev(cache, csize); in cache_preresume()
2961 cache->sized = true; in cache_preresume()
2964 if (!cache->loaded_mappings) { in cache_preresume()
2965 r = dm_cache_load_mappings(cache->cmd, cache->policy, in cache_preresume()
2966 load_mapping, cache); in cache_preresume()
2968 DMERR("%s: could not load cache mappings", cache_device_name(cache)); in cache_preresume()
2969 metadata_operation_failed(cache, "dm_cache_load_mappings", r); in cache_preresume()
2973 cache->loaded_mappings = true; in cache_preresume()
2976 if (!cache->loaded_discards) { in cache_preresume()
2981 * discard block size changed. To be safe we start by in cache_preresume()
2984 clear_bitset(cache->discard_bitset, from_dblock(cache->discard_nr_blocks)); in cache_preresume()
2986 discard_load_info_init(cache, &li); in cache_preresume()
2987 r = dm_cache_load_discards(cache->cmd, load_discard, &li); in cache_preresume()
2989 DMERR("%s: could not load origin discards", cache_device_name(cache)); in cache_preresume()
2990 metadata_operation_failed(cache, "dm_cache_load_discards", r); in cache_preresume()
2995 cache->loaded_discards = true; in cache_preresume()
3003 struct cache *cache = ti->private; in cache_resume() local
3005 cache->need_tick_bio = true; in cache_resume()
3006 allow_background_work(cache); in cache_resume()
3007 do_waker(&cache->waker.work); in cache_resume()
3010 static void emit_flags(struct cache *cache, char *result, in emit_flags() argument
3014 struct cache_features *cf = &cache->features; in emit_flags()
3015 unsigned int count = (cf->metadata_version == 2) + !cf->discard_passdown + 1; in emit_flags()
3019 if (cf->metadata_version == 2) in emit_flags()
3022 if (writethrough_mode(cache)) in emit_flags()
3025 else if (passthrough_mode(cache)) in emit_flags()
3028 else if (writeback_mode(cache)) in emit_flags()
3034 cache_device_name(cache), (int) cf->io_mode); in emit_flags()
3037 if (!cf->discard_passdown) in emit_flags()
3046 * <metadata block size> <#used metadata blocks>/<#total metadata blocks>
3047 * <cache block size> <#used cache blocks>/<#total cache blocks>
3052 * <policy name> <#policy args> <policy args>* <cache metadata mode> <needs_check>
3063 struct cache *cache = ti->private; in cache_status() local
3069 if (get_cache_mode(cache) == CM_FAIL) { in cache_status()
3074 /* Commit to ensure statistics aren't out-of-date */ in cache_status()
3076 (void) commit(cache, false); in cache_status()
3078 r = dm_cache_get_free_metadata_block_count(cache->cmd, &nr_free_blocks_metadata); in cache_status()
3081 cache_device_name(cache), r); in cache_status()
3085 r = dm_cache_get_metadata_dev_size(cache->cmd, &nr_blocks_metadata); in cache_status()
3088 cache_device_name(cache), r); in cache_status()
3092 residency = policy_residency(cache->policy); in cache_status()
3096 (unsigned long long)(nr_blocks_metadata - nr_free_blocks_metadata), in cache_status()
3098 (unsigned long long)cache->sectors_per_block, in cache_status()
3100 (unsigned long long) from_cblock(cache->cache_size), in cache_status()
3101 (unsigned int) atomic_read(&cache->stats.read_hit), in cache_status()
3102 (unsigned int) atomic_read(&cache->stats.read_miss), in cache_status()
3103 (unsigned int) atomic_read(&cache->stats.write_hit), in cache_status()
3104 (unsigned int) atomic_read(&cache->stats.write_miss), in cache_status()
3105 (unsigned int) atomic_read(&cache->stats.demotion), in cache_status()
3106 (unsigned int) atomic_read(&cache->stats.promotion), in cache_status()
3107 (unsigned long) atomic_read(&cache->nr_dirty)); in cache_status()
3109 emit_flags(cache, result, maxlen, &sz); in cache_status()
3111 DMEMIT("2 migration_threshold %llu ", (unsigned long long) cache->migration_threshold); in cache_status()
3113 DMEMIT("%s ", dm_cache_policy_get_name(cache->policy)); in cache_status()
3115 r = policy_emit_config_values(cache->policy, result, maxlen, &sz); in cache_status()
3118 cache_device_name(cache), r); in cache_status()
3121 if (get_cache_mode(cache) == CM_READ_ONLY) in cache_status()
3126 r = dm_cache_metadata_needs_check(cache->cmd, &needs_check); in cache_status()
3131 DMEMIT("- "); in cache_status()
3136 format_dev_t(buf, cache->metadata_dev->bdev->bd_dev); in cache_status()
3138 format_dev_t(buf, cache->cache_dev->bdev->bd_dev); in cache_status()
3140 format_dev_t(buf, cache->origin_dev->bdev->bd_dev); in cache_status()
3143 for (i = 0; i < cache->nr_ctr_args - 1; i++) in cache_status()
3144 DMEMIT(" %s", cache->ctr_args[i]); in cache_status()
3145 if (cache->nr_ctr_args) in cache_status()
3146 DMEMIT(" %s", cache->ctr_args[cache->nr_ctr_args - 1]); in cache_status()
3150 DMEMIT_TARGET_NAME_VERSION(ti->type); in cache_status()
3151 if (get_cache_mode(cache) == CM_FAIL) in cache_status()
3153 else if (get_cache_mode(cache) == CM_READ_ONLY) in cache_status()
3158 format_dev_t(buf, cache->metadata_dev->bdev->bd_dev); in cache_status()
3160 format_dev_t(buf, cache->cache_dev->bdev->bd_dev); in cache_status()
3162 format_dev_t(buf, cache->origin_dev->bdev->bd_dev); in cache_status()
3164 DMEMIT(",writethrough=%c", writethrough_mode(cache) ? 'y' : 'n'); in cache_status()
3165 DMEMIT(",writeback=%c", writeback_mode(cache) ? 'y' : 'n'); in cache_status()
3166 DMEMIT(",passthrough=%c", passthrough_mode(cache) ? 'y' : 'n'); in cache_status()
3167 DMEMIT(",metadata2=%c", cache->features.metadata_version == 2 ? 'y' : 'n'); in cache_status()
3168 DMEMIT(",no_discard_passdown=%c", cache->features.discard_passdown ? 'n' : 'y'); in cache_status()
3180 * Defines a range of cblocks, begin to (end - 1) are in the range. end is
3181 * the one-past-the-end value.
3189 * A cache block range can take two forms:
3192 * ii) A begin and end cblock with a dash between, eg. 123-234
3194 static int parse_cblock_range(struct cache *cache, const char *str, in parse_cblock_range() argument
3204 r = sscanf(str, "%llu-%llu%c", &b, &e, &dummy); in parse_cblock_range()
3207 result->begin = to_cblock(b); in parse_cblock_range()
3208 result->end = to_cblock(e); in parse_cblock_range()
3218 result->begin = to_cblock(b); in parse_cblock_range()
3219 result->end = to_cblock(from_cblock(result->begin) + 1u); in parse_cblock_range()
3223 DMERR("%s: invalid cblock range '%s'", cache_device_name(cache), str); in parse_cblock_range()
3224 return -EINVAL; in parse_cblock_range()
3227 static int validate_cblock_range(struct cache *cache, struct cblock_range *range) in validate_cblock_range() argument
3229 uint64_t b = from_cblock(range->begin); in validate_cblock_range()
3230 uint64_t e = from_cblock(range->end); in validate_cblock_range()
3231 uint64_t n = from_cblock(cache->cache_size); in validate_cblock_range()
3235 cache_device_name(cache), b, n); in validate_cblock_range()
3236 return -EINVAL; in validate_cblock_range()
3241 cache_device_name(cache), e, n); in validate_cblock_range()
3242 return -EINVAL; in validate_cblock_range()
3247 cache_device_name(cache), b, e); in validate_cblock_range()
3248 return -EINVAL; in validate_cblock_range()
3259 static int request_invalidation(struct cache *cache, struct cblock_range *range) in request_invalidation() argument
3269 while (range->begin != range->end) { in request_invalidation()
3270 r = invalidate_cblock(cache, range->begin); in request_invalidation()
3274 range->begin = cblock_succ(range->begin); in request_invalidation()
3277 cache->commit_requested = true; in request_invalidation()
3281 static int process_invalidate_cblocks_message(struct cache *cache, unsigned int count, in process_invalidate_cblocks_message() argument
3288 if (!passthrough_mode(cache)) { in process_invalidate_cblocks_message()
3289 DMERR("%s: cache has to be in passthrough mode for invalidation", in process_invalidate_cblocks_message()
3290 cache_device_name(cache)); in process_invalidate_cblocks_message()
3291 return -EPERM; in process_invalidate_cblocks_message()
3295 r = parse_cblock_range(cache, cblock_ranges[i], &range); in process_invalidate_cblocks_message()
3299 r = validate_cblock_range(cache, &range); in process_invalidate_cblocks_message()
3306 r = request_invalidation(cache, &range); in process_invalidate_cblocks_message()
3318 * "invalidate_cblocks [(<begin>)|(<begin>-<end>)]*
3320 * The key migration_threshold is supported by the cache target core.
3325 struct cache *cache = ti->private; in cache_message() local
3328 return -EINVAL; in cache_message()
3330 if (get_cache_mode(cache) >= CM_READ_ONLY) { in cache_message()
3331 DMERR("%s: unable to service cache target messages in READ_ONLY or FAIL mode", in cache_message()
3332 cache_device_name(cache)); in cache_message()
3333 return -EOPNOTSUPP; in cache_message()
3337 return process_invalidate_cblocks_message(cache, argc - 1, (const char **) argv + 1); in cache_message()
3340 return -EINVAL; in cache_message()
3342 return set_config_value(cache, argv[0], argv[1]); in cache_message()
3349 struct cache *cache = ti->private; in cache_iterate_devices() local
3351 r = fn(ti, cache->cache_dev, 0, get_dev_size(cache->cache_dev), data); in cache_iterate_devices()
3353 r = fn(ti, cache->origin_dev, 0, ti->len, data); in cache_iterate_devices()
3362 static void disable_passdown_if_not_supported(struct cache *cache) in disable_passdown_if_not_supported() argument
3364 struct block_device *origin_bdev = cache->origin_dev->bdev; in disable_passdown_if_not_supported()
3368 if (!cache->features.discard_passdown) in disable_passdown_if_not_supported()
3374 else if (origin_limits->max_discard_sectors < cache->sectors_per_block) in disable_passdown_if_not_supported()
3375 reason = "max discard sectors smaller than a block"; in disable_passdown_if_not_supported()
3380 cache->features.discard_passdown = false; in disable_passdown_if_not_supported()
3384 static void set_discard_limits(struct cache *cache, struct queue_limits *limits) in set_discard_limits() argument
3386 struct block_device *origin_bdev = cache->origin_dev->bdev; in set_discard_limits()
3389 if (!cache->features.discard_passdown) { in set_discard_limits()
3391 limits->max_hw_discard_sectors = min_t(sector_t, cache->discard_block_size * 1024, in set_discard_limits()
3392 cache->origin_sectors); in set_discard_limits()
3393 limits->discard_granularity = cache->discard_block_size << SECTOR_SHIFT; in set_discard_limits()
3401 limits->max_hw_discard_sectors = origin_limits->max_hw_discard_sectors; in set_discard_limits()
3402 limits->discard_granularity = origin_limits->discard_granularity; in set_discard_limits()
3403 limits->discard_alignment = origin_limits->discard_alignment; in set_discard_limits()
3408 struct cache *cache = ti->private; in cache_io_hints() local
3409 uint64_t io_opt_sectors = limits->io_opt >> SECTOR_SHIFT; in cache_io_hints()
3412 * If the system-determined stacked limits are compatible with the in cache_io_hints()
3413 * cache's blocksize (io_opt is a factor) do not override them. in cache_io_hints()
3415 if (io_opt_sectors < cache->sectors_per_block || in cache_io_hints()
3416 do_div(io_opt_sectors, cache->sectors_per_block)) { in cache_io_hints()
3417 limits->io_min = cache->sectors_per_block << SECTOR_SHIFT; in cache_io_hints()
3418 limits->io_opt = cache->sectors_per_block << SECTOR_SHIFT; in cache_io_hints()
3421 disable_passdown_if_not_supported(cache); in cache_io_hints()
3422 set_discard_limits(cache, limits); in cache_io_hints()
3425 /*----------------------------------------------------------------*/
3428 .name = "cache",
3450 r = -ENOMEM; in dm_cache_init()
3457 r = -ENOMEM; in dm_cache_init()
3484 MODULE_DESCRIPTION(DM_NAME " cache target");