Lines Matching full:cache
10 #include "dm-cache-metadata.h"
23 #define DM_MSG_PREFIX "cache"
26 "A percentage of time allocated for copying to and/or from cache");
34 * cblock: index of a cache block
35 * promotion: movement of a block from origin to cache
36 * demotion: movement of a block from cache to origin
37 * migration: movement of a block between the origin and cache device,
240 * The block size of the device holding cache data must be
255 * dirty. If you lose the cache device you will lose data.
261 * Data is written to both cache and origin. Blocks are never
267 * A degraded mode useful for various cache coherency situations
269 * origin. If a write goes to a cached oblock, then the cache
296 struct cache { struct
330 * Size of the cache device in blocks. argument
385 * Cache features such as write-through.
420 struct cache *cache; argument
432 static bool writethrough_mode(struct cache *cache) in writethrough_mode() argument
434 return cache->features.io_mode == CM_IO_WRITETHROUGH; in writethrough_mode()
437 static bool writeback_mode(struct cache *cache) in writeback_mode() argument
439 return cache->features.io_mode == CM_IO_WRITEBACK; in writeback_mode()
442 static inline bool passthrough_mode(struct cache *cache) in passthrough_mode() argument
444 return unlikely(cache->features.io_mode == CM_IO_PASSTHROUGH); in passthrough_mode()
449 static void wake_deferred_bio_worker(struct cache *cache) in wake_deferred_bio_worker() argument
451 queue_work(cache->wq, &cache->deferred_bio_worker); in wake_deferred_bio_worker()
454 static void wake_migration_worker(struct cache *cache) in wake_migration_worker() argument
456 if (passthrough_mode(cache)) in wake_migration_worker()
459 queue_work(cache->wq, &cache->migration_worker); in wake_migration_worker()
464 static struct dm_bio_prison_cell_v2 *alloc_prison_cell(struct cache *cache) in alloc_prison_cell() argument
466 return dm_bio_prison_alloc_cell_v2(cache->prison, GFP_NOIO); in alloc_prison_cell()
469 static void free_prison_cell(struct cache *cache, struct dm_bio_prison_cell_v2 *cell) in free_prison_cell() argument
471 dm_bio_prison_free_cell_v2(cache->prison, cell); in free_prison_cell()
474 static struct dm_cache_migration *alloc_migration(struct cache *cache) in alloc_migration() argument
478 mg = mempool_alloc(&cache->migration_pool, GFP_NOIO); in alloc_migration()
482 mg->cache = cache; in alloc_migration()
483 atomic_inc(&cache->nr_allocated_migrations); in alloc_migration()
490 struct cache *cache = mg->cache; in free_migration() local
492 if (atomic_dec_and_test(&cache->nr_allocated_migrations)) in free_migration()
493 wake_up(&cache->migration_wait); in free_migration()
495 mempool_free(mg, &cache->migration_pool); in free_migration()
552 static void defer_bio(struct cache *cache, struct bio *bio) in defer_bio() argument
554 spin_lock_irq(&cache->lock); in defer_bio()
555 bio_list_add(&cache->deferred_bios, bio); in defer_bio()
556 spin_unlock_irq(&cache->lock); in defer_bio()
558 wake_deferred_bio_worker(cache); in defer_bio()
561 static void defer_bios(struct cache *cache, struct bio_list *bios) in defer_bios() argument
563 spin_lock_irq(&cache->lock); in defer_bios()
564 bio_list_merge(&cache->deferred_bios, bios); in defer_bios()
566 spin_unlock_irq(&cache->lock); in defer_bios()
568 wake_deferred_bio_worker(cache); in defer_bios()
573 static bool bio_detain_shared(struct cache *cache, dm_oblock_t oblock, struct bio *bio) in bio_detain_shared() argument
581 cell_prealloc = alloc_prison_cell(cache); /* FIXME: allow wait if calling from worker */ in bio_detain_shared()
584 r = dm_cell_get_v2(cache->prison, &key, lock_level(bio), bio, cell_prealloc, &cell); in bio_detain_shared()
589 free_prison_cell(cache, cell_prealloc); in bio_detain_shared()
594 free_prison_cell(cache, cell_prealloc); in bio_detain_shared()
604 static bool is_dirty(struct cache *cache, dm_cblock_t b) in is_dirty() argument
606 return test_bit(from_cblock(b), cache->dirty_bitset); in is_dirty()
609 static void set_dirty(struct cache *cache, dm_cblock_t cblock) in set_dirty() argument
611 if (!test_and_set_bit(from_cblock(cblock), cache->dirty_bitset)) { in set_dirty()
612 atomic_inc(&cache->nr_dirty); in set_dirty()
613 policy_set_dirty(cache->policy, cblock); in set_dirty()
621 static void force_set_dirty(struct cache *cache, dm_cblock_t cblock) in force_set_dirty() argument
623 if (!test_and_set_bit(from_cblock(cblock), cache->dirty_bitset)) in force_set_dirty()
624 atomic_inc(&cache->nr_dirty); in force_set_dirty()
625 policy_set_dirty(cache->policy, cblock); in force_set_dirty()
628 static void force_clear_dirty(struct cache *cache, dm_cblock_t cblock) in force_clear_dirty() argument
630 if (test_and_clear_bit(from_cblock(cblock), cache->dirty_bitset)) { in force_clear_dirty()
631 if (atomic_dec_return(&cache->nr_dirty) == 0) in force_clear_dirty()
632 dm_table_event(cache->ti->table); in force_clear_dirty()
635 policy_clear_dirty(cache->policy, cblock); in force_clear_dirty()
640 static bool block_size_is_power_of_two(struct cache *cache) in block_size_is_power_of_two() argument
642 return cache->sectors_per_block_shift >= 0; in block_size_is_power_of_two()
652 static dm_block_t oblocks_per_dblock(struct cache *cache) in oblocks_per_dblock() argument
654 dm_block_t oblocks = cache->discard_block_size; in oblocks_per_dblock()
656 if (block_size_is_power_of_two(cache)) in oblocks_per_dblock()
657 oblocks >>= cache->sectors_per_block_shift; in oblocks_per_dblock()
659 oblocks = block_div(oblocks, cache->sectors_per_block); in oblocks_per_dblock()
664 static dm_dblock_t oblock_to_dblock(struct cache *cache, dm_oblock_t oblock) in oblock_to_dblock() argument
667 oblocks_per_dblock(cache))); in oblock_to_dblock()
670 static void set_discard(struct cache *cache, dm_dblock_t b) in set_discard() argument
672 BUG_ON(from_dblock(b) >= from_dblock(cache->discard_nr_blocks)); in set_discard()
673 atomic_inc(&cache->stats.discard_count); in set_discard()
675 spin_lock_irq(&cache->lock); in set_discard()
676 set_bit(from_dblock(b), cache->discard_bitset); in set_discard()
677 spin_unlock_irq(&cache->lock); in set_discard()
680 static void clear_discard(struct cache *cache, dm_dblock_t b) in clear_discard() argument
682 spin_lock_irq(&cache->lock); in clear_discard()
683 clear_bit(from_dblock(b), cache->discard_bitset); in clear_discard()
684 spin_unlock_irq(&cache->lock); in clear_discard()
687 static bool is_discarded(struct cache *cache, dm_dblock_t b) in is_discarded() argument
690 spin_lock_irq(&cache->lock); in is_discarded()
691 r = test_bit(from_dblock(b), cache->discard_bitset); in is_discarded()
692 spin_unlock_irq(&cache->lock); in is_discarded()
697 static bool is_discarded_oblock(struct cache *cache, dm_oblock_t b) in is_discarded_oblock() argument
700 spin_lock_irq(&cache->lock); in is_discarded_oblock()
701 r = test_bit(from_dblock(oblock_to_dblock(cache, b)), in is_discarded_oblock()
702 cache->discard_bitset); in is_discarded_oblock()
703 spin_unlock_irq(&cache->lock); in is_discarded_oblock()
711 static void remap_to_origin(struct cache *cache, struct bio *bio) in remap_to_origin() argument
713 bio_set_dev(bio, cache->origin_dev->bdev); in remap_to_origin()
716 static void remap_to_cache(struct cache *cache, struct bio *bio, in remap_to_cache() argument
722 bio_set_dev(bio, cache->cache_dev->bdev); in remap_to_cache()
723 if (!block_size_is_power_of_two(cache)) in remap_to_cache()
725 (block * cache->sectors_per_block) + in remap_to_cache()
726 sector_div(bi_sector, cache->sectors_per_block); in remap_to_cache()
729 (block << cache->sectors_per_block_shift) | in remap_to_cache()
730 (bi_sector & (cache->sectors_per_block - 1)); in remap_to_cache()
733 static void check_if_tick_bio_needed(struct cache *cache, struct bio *bio) in check_if_tick_bio_needed() argument
737 spin_lock_irq(&cache->lock); in check_if_tick_bio_needed()
738 if (cache->need_tick_bio && !op_is_flush(bio->bi_opf) && in check_if_tick_bio_needed()
742 cache->need_tick_bio = false; in check_if_tick_bio_needed()
744 spin_unlock_irq(&cache->lock); in check_if_tick_bio_needed()
747 static void remap_to_origin_clear_discard(struct cache *cache, struct bio *bio, in remap_to_origin_clear_discard() argument
751 check_if_tick_bio_needed(cache, bio); in remap_to_origin_clear_discard()
752 remap_to_origin(cache, bio); in remap_to_origin_clear_discard()
754 clear_discard(cache, oblock_to_dblock(cache, oblock)); in remap_to_origin_clear_discard()
757 static void remap_to_cache_dirty(struct cache *cache, struct bio *bio, in remap_to_cache_dirty() argument
760 check_if_tick_bio_needed(cache, bio); in remap_to_cache_dirty()
761 remap_to_cache(cache, bio, cblock); in remap_to_cache_dirty()
763 set_dirty(cache, cblock); in remap_to_cache_dirty()
764 clear_discard(cache, oblock_to_dblock(cache, oblock)); in remap_to_cache_dirty()
768 static dm_oblock_t get_bio_block(struct cache *cache, struct bio *bio) in get_bio_block() argument
772 if (!block_size_is_power_of_two(cache)) in get_bio_block()
773 (void) sector_div(block_nr, cache->sectors_per_block); in get_bio_block()
775 block_nr >>= cache->sectors_per_block_shift; in get_bio_block()
780 static bool accountable_bio(struct cache *cache, struct bio *bio) in accountable_bio() argument
785 static void accounted_begin(struct cache *cache, struct bio *bio) in accounted_begin() argument
789 if (accountable_bio(cache, bio)) { in accounted_begin()
792 dm_iot_io_begin(&cache->tracker, pb->len); in accounted_begin()
796 static void accounted_complete(struct cache *cache, struct bio *bio) in accounted_complete() argument
800 dm_iot_io_end(&cache->tracker, pb->len); in accounted_complete()
803 static void accounted_request(struct cache *cache, struct bio *bio) in accounted_request() argument
805 accounted_begin(cache, bio); in accounted_request()
811 struct cache *cache = context; in issue_op() local
812 accounted_request(cache, bio); in issue_op()
817 * to both the cache and origin devices. Clone the bio and send them in parallel.
819 static void remap_to_origin_and_cache(struct cache *cache, struct bio *bio, in remap_to_origin_and_cache() argument
822 struct bio *origin_bio = bio_alloc_clone(cache->origin_dev->bdev, bio, in remap_to_origin_and_cache()
823 GFP_NOIO, &cache->bs); in remap_to_origin_and_cache()
830 clear_discard(cache, oblock_to_dblock(cache, oblock)); in remap_to_origin_and_cache()
833 remap_to_cache(cache, bio, cblock); in remap_to_origin_and_cache()
839 static enum cache_metadata_mode get_cache_mode(struct cache *cache) in get_cache_mode() argument
841 return cache->features.mode; in get_cache_mode()
844 static const char *cache_device_name(struct cache *cache) in cache_device_name() argument
846 return dm_table_device_name(cache->ti->table); in cache_device_name()
849 static void notify_mode_switch(struct cache *cache, enum cache_metadata_mode mode) in notify_mode_switch() argument
857 dm_table_event(cache->ti->table); in notify_mode_switch()
858 DMINFO("%s: switching cache to %s mode", in notify_mode_switch()
859 cache_device_name(cache), descs[(int)mode]); in notify_mode_switch()
862 static void set_cache_mode(struct cache *cache, enum cache_metadata_mode new_mode) in set_cache_mode() argument
865 enum cache_metadata_mode old_mode = get_cache_mode(cache); in set_cache_mode()
867 if (dm_cache_metadata_needs_check(cache->cmd, &needs_check)) { in set_cache_mode()
869 cache_device_name(cache)); in set_cache_mode()
874 DMERR("%s: unable to switch cache to write mode until repaired.", in set_cache_mode()
875 cache_device_name(cache)); in set_cache_mode()
889 dm_cache_metadata_set_read_only(cache->cmd); in set_cache_mode()
893 dm_cache_metadata_set_read_write(cache->cmd); in set_cache_mode()
897 cache->features.mode = new_mode; in set_cache_mode()
900 notify_mode_switch(cache, new_mode); in set_cache_mode()
903 static void abort_transaction(struct cache *cache) in abort_transaction() argument
905 const char *dev_name = cache_device_name(cache); in abort_transaction()
907 if (get_cache_mode(cache) >= CM_READ_ONLY) in abort_transaction()
910 if (dm_cache_metadata_set_needs_check(cache->cmd)) { in abort_transaction()
912 set_cache_mode(cache, CM_FAIL); in abort_transaction()
916 if (dm_cache_metadata_abort(cache->cmd)) { in abort_transaction()
918 set_cache_mode(cache, CM_FAIL); in abort_transaction()
922 static void metadata_operation_failed(struct cache *cache, const char *op, int r) in metadata_operation_failed() argument
925 cache_device_name(cache), op, r); in metadata_operation_failed()
926 abort_transaction(cache); in metadata_operation_failed()
927 set_cache_mode(cache, CM_READ_ONLY); in metadata_operation_failed()
932 static void load_stats(struct cache *cache) in load_stats() argument
936 dm_cache_metadata_get_stats(cache->cmd, &stats); in load_stats()
937 atomic_set(&cache->stats.read_hit, stats.read_hits); in load_stats()
938 atomic_set(&cache->stats.read_miss, stats.read_misses); in load_stats()
939 atomic_set(&cache->stats.write_hit, stats.write_hits); in load_stats()
940 atomic_set(&cache->stats.write_miss, stats.write_misses); in load_stats()
943 static void save_stats(struct cache *cache) in save_stats() argument
947 if (get_cache_mode(cache) >= CM_READ_ONLY) in save_stats()
950 stats.read_hits = atomic_read(&cache->stats.read_hit); in save_stats()
951 stats.read_misses = atomic_read(&cache->stats.read_miss); in save_stats()
952 stats.write_hits = atomic_read(&cache->stats.write_hit); in save_stats()
953 stats.write_misses = atomic_read(&cache->stats.write_miss); in save_stats()
955 dm_cache_metadata_set_stats(cache->cmd, &stats); in save_stats()
978 * Migration covers moving data from the origin device to the cache, or
982 static void inc_io_migrations(struct cache *cache) in inc_io_migrations() argument
984 atomic_inc(&cache->nr_io_migrations); in inc_io_migrations()
987 static void dec_io_migrations(struct cache *cache) in dec_io_migrations() argument
989 atomic_dec(&cache->nr_io_migrations); in dec_io_migrations()
997 static void calc_discard_block_range(struct cache *cache, struct bio *bio, in calc_discard_block_range() argument
1003 *b = to_dblock(dm_sector_div_up(sb, cache->discard_block_size)); in calc_discard_block_range()
1005 if (se - sb < cache->discard_block_size) in calc_discard_block_range()
1008 *e = to_dblock(block_div(se, cache->discard_block_size)); in calc_discard_block_range()
1013 static void prevent_background_work(struct cache *cache) in prevent_background_work() argument
1016 down_write(&cache->background_work_lock); in prevent_background_work()
1020 static void allow_background_work(struct cache *cache) in allow_background_work() argument
1023 up_write(&cache->background_work_lock); in allow_background_work()
1027 static bool background_work_begin(struct cache *cache) in background_work_begin() argument
1032 r = down_read_trylock(&cache->background_work_lock); in background_work_begin()
1038 static void background_work_end(struct cache *cache) in background_work_end() argument
1041 up_read(&cache->background_work_lock); in background_work_end()
1047 static bool bio_writes_complete_block(struct cache *cache, struct bio *bio) in bio_writes_complete_block() argument
1050 (bio->bi_iter.bi_size == (cache->sectors_per_block << SECTOR_SHIFT)); in bio_writes_complete_block()
1053 static bool optimisable_bio(struct cache *cache, struct bio *bio, dm_oblock_t block) in optimisable_bio() argument
1055 return writeback_mode(cache) && in optimisable_bio()
1056 (is_discarded_oblock(cache, block) || bio_writes_complete_block(cache, bio)); in optimisable_bio()
1063 dm_cell_quiesce_v2(mg->cache->prison, mg->cell, &mg->k.ws); in quiesce()
1079 queue_continuation(mg->cache->wq, &mg->k); in copy_complete()
1085 struct cache *cache = mg->cache; in copy() local
1087 o_region.bdev = cache->origin_dev->bdev; in copy()
1088 o_region.sector = from_oblock(mg->op->oblock) * cache->sectors_per_block; in copy()
1089 o_region.count = cache->sectors_per_block; in copy()
1091 c_region.bdev = cache->cache_dev->bdev; in copy()
1092 c_region.sector = from_cblock(mg->op->cblock) * cache->sectors_per_block; in copy()
1093 c_region.count = cache->sectors_per_block; in copy()
1096 dm_kcopyd_copy(cache->copier, &o_region, 1, &c_region, 0, copy_complete, &mg->k); in copy()
1098 dm_kcopyd_copy(cache->copier, &c_region, 1, &o_region, 0, copy_complete, &mg->k); in copy()
1101 static void bio_drop_shared_lock(struct cache *cache, struct bio *bio) in bio_drop_shared_lock() argument
1105 if (pb->cell && dm_cell_put_v2(cache->prison, pb->cell)) in bio_drop_shared_lock()
1106 free_prison_cell(cache, pb->cell); in bio_drop_shared_lock()
1113 struct cache *cache = mg->cache; in overwrite_endio() local
1121 queue_continuation(cache->wq, &mg->k); in overwrite_endio()
1137 remap_to_cache(mg->cache, bio, mg->op->cblock); in overwrite()
1139 remap_to_origin(mg->cache, bio); in overwrite()
1142 accounted_request(mg->cache, bio); in overwrite()
1159 struct cache *cache = mg->cache; in mg_complete() local
1164 update_stats(&cache->stats, op->op); in mg_complete()
1168 clear_discard(cache, oblock_to_dblock(cache, op->oblock)); in mg_complete()
1169 policy_complete_background_work(cache->policy, op, success); in mg_complete()
1173 force_set_dirty(cache, cblock); in mg_complete()
1181 force_clear_dirty(cache, cblock); in mg_complete()
1182 dec_io_migrations(cache); in mg_complete()
1191 force_clear_dirty(cache, cblock); in mg_complete()
1192 policy_complete_background_work(cache->policy, op, success); in mg_complete()
1193 dec_io_migrations(cache); in mg_complete()
1198 force_clear_dirty(cache, cblock); in mg_complete()
1199 policy_complete_background_work(cache->policy, op, success); in mg_complete()
1200 dec_io_migrations(cache); in mg_complete()
1206 if (dm_cell_unlock_v2(cache->prison, mg->cell, &bios)) in mg_complete()
1207 free_prison_cell(cache, mg->cell); in mg_complete()
1211 defer_bios(cache, &bios); in mg_complete()
1212 wake_migration_worker(cache); in mg_complete()
1214 background_work_end(cache); in mg_complete()
1227 struct cache *cache = mg->cache; in mg_update_metadata() local
1232 r = dm_cache_insert_mapping(cache->cmd, op->cblock, op->oblock); in mg_update_metadata()
1235 cache_device_name(cache)); in mg_update_metadata()
1236 metadata_operation_failed(cache, "dm_cache_insert_mapping", r); in mg_update_metadata()
1245 r = dm_cache_remove_mapping(cache->cmd, op->cblock); in mg_update_metadata()
1248 cache_device_name(cache)); in mg_update_metadata()
1249 metadata_operation_failed(cache, "dm_cache_remove_mapping", r); in mg_update_metadata()
1260 * - vblock x in a cache block in mg_update_metadata()
1262 * - cache block gets reallocated and over written in mg_update_metadata()
1265 * When we recover, because there was no commit the cache will in mg_update_metadata()
1266 * rollback to having the data for vblock x in the cache block. in mg_update_metadata()
1267 * But the cache block has since been overwritten, so it'll end in mg_update_metadata()
1275 continue_after_commit(&cache->committer, &mg->k); in mg_update_metadata()
1276 schedule_commit(&cache->committer); in mg_update_metadata()
1313 r = dm_cell_lock_promote_v2(mg->cache->prison, mg->cell, in mg_upgrade_lock()
1329 struct cache *cache = mg->cache; in mg_full_copy() local
1333 if ((!is_policy_promote && !is_dirty(cache, op->cblock)) || in mg_full_copy()
1334 is_discarded_oblock(cache, op->oblock)) { in mg_full_copy()
1353 if (!optimisable_bio(mg->cache, mg->overwrite_bio, mg->op->oblock)) { in mg_copy()
1357 bool rb = bio_detain_shared(mg->cache, mg->op->oblock, mg->overwrite_bio); in mg_copy()
1360 inc_io_migrations(mg->cache); in mg_copy()
1382 struct cache *cache = mg->cache; in mg_lock_writes() local
1385 prealloc = alloc_prison_cell(cache); in mg_lock_writes()
1393 r = dm_cell_lock_v2(cache->prison, &key, in mg_lock_writes()
1397 free_prison_cell(cache, prealloc); in mg_lock_writes()
1403 free_prison_cell(cache, prealloc); in mg_lock_writes()
1413 static int mg_start(struct cache *cache, struct policy_work *op, struct bio *bio) in mg_start() argument
1417 if (!background_work_begin(cache)) { in mg_start()
1418 policy_complete_background_work(cache->policy, op, false); in mg_start()
1422 mg = alloc_migration(cache); in mg_start()
1428 inc_io_migrations(cache); in mg_start()
1440 struct cache *cache = mg->cache; in invalidate_complete() local
1443 if (dm_cell_unlock_v2(cache->prison, mg->cell, &bios)) in invalidate_complete()
1444 free_prison_cell(cache, mg->cell); in invalidate_complete()
1450 defer_bios(cache, &bios); in invalidate_complete()
1452 background_work_end(cache); in invalidate_complete()
1461 static int invalidate_cblock(struct cache *cache, dm_cblock_t cblock) in invalidate_cblock() argument
1463 int r = policy_invalidate_mapping(cache->policy, cblock); in invalidate_cblock()
1465 r = dm_cache_remove_mapping(cache->cmd, cblock); in invalidate_cblock()
1468 cache_device_name(cache)); in invalidate_cblock()
1469 metadata_operation_failed(cache, "dm_cache_remove_mapping", r); in invalidate_cblock()
1479 DMERR("%s: policy_invalidate_mapping failed", cache_device_name(cache)); in invalidate_cblock()
1488 struct cache *cache = mg->cache; in invalidate_remove() local
1490 r = invalidate_cblock(cache, mg->invalidate_cblock); in invalidate_remove()
1497 continue_after_commit(&cache->committer, &mg->k); in invalidate_remove()
1498 remap_to_origin_clear_discard(cache, mg->overwrite_bio, mg->invalidate_oblock); in invalidate_remove()
1500 schedule_commit(&cache->committer); in invalidate_remove()
1507 struct cache *cache = mg->cache; in invalidate_lock() local
1510 prealloc = alloc_prison_cell(cache); in invalidate_lock()
1513 r = dm_cell_lock_v2(cache->prison, &key, in invalidate_lock()
1516 free_prison_cell(cache, prealloc); in invalidate_lock()
1522 free_prison_cell(cache, prealloc); in invalidate_lock()
1533 queue_work(cache->wq, &mg->k.ws); in invalidate_lock()
1539 static int invalidate_start(struct cache *cache, dm_cblock_t cblock, in invalidate_start() argument
1544 if (!background_work_begin(cache)) in invalidate_start()
1547 mg = alloc_migration(cache); in invalidate_start()
1565 static enum busy spare_migration_bandwidth(struct cache *cache) in spare_migration_bandwidth() argument
1567 bool idle = dm_iot_idle_for(&cache->tracker, HZ); in spare_migration_bandwidth()
1568 sector_t current_volume = (atomic_read(&cache->nr_io_migrations) + 1) * in spare_migration_bandwidth()
1569 cache->sectors_per_block; in spare_migration_bandwidth()
1571 if (idle && current_volume <= cache->migration_threshold) in spare_migration_bandwidth()
1577 static void inc_hit_counter(struct cache *cache, struct bio *bio) in inc_hit_counter() argument
1580 &cache->stats.read_hit : &cache->stats.write_hit); in inc_hit_counter()
1583 static void inc_miss_counter(struct cache *cache, struct bio *bio) in inc_miss_counter() argument
1586 &cache->stats.read_miss : &cache->stats.write_miss); in inc_miss_counter()
1591 static int map_bio(struct cache *cache, struct bio *bio, dm_oblock_t block, in map_bio() argument
1600 rb = bio_detain_shared(cache, block, bio); in map_bio()
1614 if (optimisable_bio(cache, bio, block)) { in map_bio()
1617 r = policy_lookup_with_work(cache->policy, block, &cblock, data_dir, true, &op); in map_bio()
1620 cache_device_name(cache), r); in map_bio()
1626 bio_drop_shared_lock(cache, bio); in map_bio()
1628 mg_start(cache, op, bio); in map_bio()
1632 r = policy_lookup(cache->policy, block, &cblock, data_dir, false, &background_queued); in map_bio()
1635 cache_device_name(cache), r); in map_bio()
1641 wake_migration_worker(cache); in map_bio()
1650 inc_miss_counter(cache, bio); in map_bio()
1652 accounted_begin(cache, bio); in map_bio()
1653 remap_to_origin_clear_discard(cache, bio, block); in map_bio()
1666 inc_hit_counter(cache, bio); in map_bio()
1670 * cache blocks that are written to. in map_bio()
1672 if (passthrough_mode(cache)) { in map_bio()
1674 bio_drop_shared_lock(cache, bio); in map_bio()
1675 atomic_inc(&cache->stats.demotion); in map_bio()
1676 invalidate_start(cache, cblock, block, bio); in map_bio()
1678 remap_to_origin_clear_discard(cache, bio, block); in map_bio()
1680 if (bio_data_dir(bio) == WRITE && writethrough_mode(cache) && in map_bio()
1681 !is_dirty(cache, cblock)) { in map_bio()
1682 remap_to_origin_and_cache(cache, bio, block, cblock); in map_bio()
1683 accounted_begin(cache, bio); in map_bio()
1685 remap_to_cache_dirty(cache, bio, block, cblock); in map_bio()
1697 accounted_complete(cache, bio); in map_bio()
1698 issue_after_commit(&cache->committer, bio); in map_bio()
1706 static bool process_bio(struct cache *cache, struct bio *bio) in process_bio() argument
1710 if (map_bio(cache, bio, get_bio_block(cache, bio), &commit_needed) == DM_MAPIO_REMAPPED) in process_bio()
1719 static int commit(struct cache *cache, bool clean_shutdown) in commit() argument
1723 if (get_cache_mode(cache) >= CM_READ_ONLY) in commit()
1726 atomic_inc(&cache->stats.commit_count); in commit()
1727 r = dm_cache_commit(cache->cmd, clean_shutdown); in commit()
1729 metadata_operation_failed(cache, "dm_cache_commit", r); in commit()
1739 struct cache *cache = context; in commit_op() local
1741 if (dm_cache_changed_this_transaction(cache->cmd)) in commit_op()
1742 return errno_to_blk_status(commit(cache, false)); in commit_op()
1749 static bool process_flush_bio(struct cache *cache, struct bio *bio) in process_flush_bio() argument
1754 remap_to_origin(cache, bio); in process_flush_bio()
1756 remap_to_cache(cache, bio, 0); in process_flush_bio()
1758 issue_after_commit(&cache->committer, bio); in process_flush_bio()
1762 static bool process_discard_bio(struct cache *cache, struct bio *bio) in process_discard_bio() argument
1769 calc_discard_block_range(cache, bio, &b, &e); in process_discard_bio()
1771 set_discard(cache, b); in process_discard_bio()
1775 if (cache->features.discard_passdown) { in process_discard_bio()
1776 remap_to_origin(cache, bio); in process_discard_bio()
1786 struct cache *cache = container_of(ws, struct cache, deferred_bio_worker); in process_deferred_bios() local
1794 spin_lock_irq(&cache->lock); in process_deferred_bios()
1795 bio_list_merge(&bios, &cache->deferred_bios); in process_deferred_bios()
1796 bio_list_init(&cache->deferred_bios); in process_deferred_bios()
1797 spin_unlock_irq(&cache->lock); in process_deferred_bios()
1801 commit_needed = process_flush_bio(cache, bio) || commit_needed; in process_deferred_bios()
1804 commit_needed = process_discard_bio(cache, bio) || commit_needed; in process_deferred_bios()
1807 commit_needed = process_bio(cache, bio) || commit_needed; in process_deferred_bios()
1811 schedule_commit(&cache->committer); in process_deferred_bios()
1818 static void requeue_deferred_bios(struct cache *cache) in requeue_deferred_bios() argument
1824 bio_list_merge(&bios, &cache->deferred_bios); in requeue_deferred_bios()
1825 bio_list_init(&cache->deferred_bios); in requeue_deferred_bios()
1839 struct cache *cache = container_of(to_delayed_work(ws), struct cache, waker); in do_waker() local
1841 policy_tick(cache->policy, true); in do_waker()
1842 wake_migration_worker(cache); in do_waker()
1843 schedule_commit(&cache->committer); in do_waker()
1844 queue_delayed_work(cache->wq, &cache->waker, COMMIT_PERIOD); in do_waker()
1851 struct cache *cache = container_of(ws, struct cache, migration_worker); in check_migrations() local
1855 b = spare_migration_bandwidth(cache); in check_migrations()
1857 r = policy_get_background_work(cache->policy, b == IDLE, &op); in check_migrations()
1863 cache_device_name(cache)); in check_migrations()
1867 r = mg_start(cache, op, NULL); in check_migrations()
1881 static void destroy(struct cache *cache) in destroy() argument
1885 mempool_exit(&cache->migration_pool); in destroy()
1887 if (cache->prison) in destroy()
1888 dm_bio_prison_destroy_v2(cache->prison); in destroy()
1890 if (cache->wq) in destroy()
1891 destroy_workqueue(cache->wq); in destroy()
1893 if (cache->dirty_bitset) in destroy()
1894 free_bitset(cache->dirty_bitset); in destroy()
1896 if (cache->discard_bitset) in destroy()
1897 free_bitset(cache->discard_bitset); in destroy()
1899 if (cache->copier) in destroy()
1900 dm_kcopyd_client_destroy(cache->copier); in destroy()
1902 if (cache->cmd) in destroy()
1903 dm_cache_metadata_close(cache->cmd); in destroy()
1905 if (cache->metadata_dev) in destroy()
1906 dm_put_device(cache->ti, cache->metadata_dev); in destroy()
1908 if (cache->origin_dev) in destroy()
1909 dm_put_device(cache->ti, cache->origin_dev); in destroy()
1911 if (cache->cache_dev) in destroy()
1912 dm_put_device(cache->ti, cache->cache_dev); in destroy()
1914 if (cache->policy) in destroy()
1915 dm_cache_policy_destroy(cache->policy); in destroy()
1917 for (i = 0; i < cache->nr_ctr_args ; i++) in destroy()
1918 kfree(cache->ctr_args[i]); in destroy()
1919 kfree(cache->ctr_args); in destroy()
1921 bioset_exit(&cache->bs); in destroy()
1923 kfree(cache); in destroy()
1928 struct cache *cache = ti->private; in cache_dtr() local
1930 destroy(cache); in cache_dtr()
1941 * Construct a cache device mapping.
1943 * cache <metadata dev> <cache dev> <origin dev> <block size>
1948 * cache dev : fast device holding cached data blocks
1950 * block size : cache unit size in sectors
1960 * See cache-policies.txt for details.
1963 * writethrough : write through caching that prohibits cache block
1966 * back cache block contents later for performance reasons,
2048 *error = "Error opening cache device"; in parse_cache_dev()
2097 *error = "Data block size is larger than the cache device"; in parse_block_size()
2118 {0, 3, "Invalid number of cache feature arguments"}, in parse_features()
2157 *error = "Unrecognised cache feature requested"; in parse_features()
2163 *error = "Duplicate cache io_mode features requested"; in parse_features()
2236 static int process_config_option(struct cache *cache, const char *key, const char *value) in process_config_option() argument
2244 cache->migration_threshold = tmp; in process_config_option()
2251 static int set_config_value(struct cache *cache, const char *key, const char *value) in set_config_value() argument
2253 int r = process_config_option(cache, key, value); in set_config_value()
2256 r = policy_set_config_value(cache->policy, key, value); in set_config_value()
2264 static int set_config_values(struct cache *cache, int argc, const char **argv) in set_config_values() argument
2274 r = set_config_value(cache, argv[0], argv[1]); in set_config_values()
2285 static int create_cache_policy(struct cache *cache, struct cache_args *ca, in create_cache_policy() argument
2289 cache->cache_size, in create_cache_policy()
2290 cache->origin_sectors, in create_cache_policy()
2291 cache->sectors_per_block); in create_cache_policy()
2293 *error = "Error creating cache's policy"; in create_cache_policy()
2296 cache->policy = p; in create_cache_policy()
2297 BUG_ON(!cache->policy); in create_cache_policy()
2303 * We want the discard block size to be at least the size of the cache
2328 static void set_cache_size(struct cache *cache, dm_cblock_t size) in set_cache_size() argument
2332 if (nr_blocks > (1 << 20) && cache->cache_size != size) in set_cache_size()
2333 DMWARN_LIMIT("You have created a cache device with a lot of individual cache blocks (%llu)\n" in set_cache_size()
2335 "Please consider increasing the cache block size to reduce the overall cache block count.", in set_cache_size()
2338 cache->cache_size = size; in set_cache_size()
2343 static int cache_create(struct cache_args *ca, struct cache **result) in cache_create()
2347 struct cache *cache; in cache_create() local
2353 cache = kzalloc(sizeof(*cache), GFP_KERNEL); in cache_create()
2354 if (!cache) in cache_create()
2357 cache->ti = ca->ti; in cache_create()
2358 ti->private = cache; in cache_create()
2368 cache->features = ca->features; in cache_create()
2369 if (writethrough_mode(cache)) { in cache_create()
2371 r = bioset_init(&cache->bs, BIO_POOL_SIZE, 0, 0); in cache_create()
2376 cache->metadata_dev = ca->metadata_dev; in cache_create()
2377 cache->origin_dev = ca->origin_dev; in cache_create()
2378 cache->cache_dev = ca->cache_dev; in cache_create()
2382 origin_blocks = cache->origin_sectors = ca->origin_sectors; in cache_create()
2384 cache->origin_blocks = to_oblock(origin_blocks); in cache_create()
2386 cache->sectors_per_block = ca->block_size; in cache_create()
2387 if (dm_set_target_max_io_len(ti, cache->sectors_per_block)) { in cache_create()
2395 cache->sectors_per_block_shift = -1; in cache_create()
2397 set_cache_size(cache, to_cblock(cache_size)); in cache_create()
2399 cache->sectors_per_block_shift = __ffs(ca->block_size); in cache_create()
2400 set_cache_size(cache, to_cblock(ca->cache_sectors >> cache->sectors_per_block_shift)); in cache_create()
2403 r = create_cache_policy(cache, ca, error); in cache_create()
2407 cache->policy_nr_args = ca->policy_argc; in cache_create()
2408 cache->migration_threshold = DEFAULT_MIGRATION_THRESHOLD; in cache_create()
2410 r = set_config_values(cache, ca->policy_argc, ca->policy_argv); in cache_create()
2412 *error = "Error setting cache policy's config values"; in cache_create()
2416 cmd = dm_cache_metadata_open(cache->metadata_dev->bdev, in cache_create()
2418 dm_cache_policy_get_hint_size(cache->policy), in cache_create()
2425 cache->cmd = cmd; in cache_create()
2426 set_cache_mode(cache, CM_WRITE); in cache_create()
2427 if (get_cache_mode(cache) != CM_WRITE) { in cache_create()
2433 if (passthrough_mode(cache)) { in cache_create()
2436 r = dm_cache_metadata_all_clean(cache->cmd, &all_clean); in cache_create()
2448 policy_allow_migrations(cache->policy, false); in cache_create()
2451 spin_lock_init(&cache->lock); in cache_create()
2452 bio_list_init(&cache->deferred_bios); in cache_create()
2453 atomic_set(&cache->nr_allocated_migrations, 0); in cache_create()
2454 atomic_set(&cache->nr_io_migrations, 0); in cache_create()
2455 init_waitqueue_head(&cache->migration_wait); in cache_create()
2458 atomic_set(&cache->nr_dirty, 0); in cache_create()
2459 cache->dirty_bitset = alloc_bitset(from_cblock(cache->cache_size)); in cache_create()
2460 if (!cache->dirty_bitset) { in cache_create()
2464 clear_bitset(cache->dirty_bitset, from_cblock(cache->cache_size)); in cache_create()
2466 cache->discard_block_size = in cache_create()
2467 calculate_discard_block_size(cache->sectors_per_block, in cache_create()
2468 cache->origin_sectors); in cache_create()
2469 cache->discard_nr_blocks = to_dblock(dm_sector_div_up(cache->origin_sectors, in cache_create()
2470 cache->discard_block_size)); in cache_create()
2471 cache->discard_bitset = alloc_bitset(from_dblock(cache->discard_nr_blocks)); in cache_create()
2472 if (!cache->discard_bitset) { in cache_create()
2476 clear_bitset(cache->discard_bitset, from_dblock(cache->discard_nr_blocks)); in cache_create()
2478 cache->copier = dm_kcopyd_client_create(&dm_kcopyd_throttle); in cache_create()
2479 if (IS_ERR(cache->copier)) { in cache_create()
2481 r = PTR_ERR(cache->copier); in cache_create()
2485 cache->wq = alloc_workqueue("dm-" DM_MSG_PREFIX, WQ_MEM_RECLAIM, 0); in cache_create()
2486 if (!cache->wq) { in cache_create()
2490 INIT_WORK(&cache->deferred_bio_worker, process_deferred_bios); in cache_create()
2491 INIT_WORK(&cache->migration_worker, check_migrations); in cache_create()
2492 INIT_DELAYED_WORK(&cache->waker, do_waker); in cache_create()
2494 cache->prison = dm_bio_prison_create_v2(cache->wq); in cache_create()
2495 if (!cache->prison) { in cache_create()
2500 r = mempool_init_slab_pool(&cache->migration_pool, MIGRATION_POOL_SIZE, in cache_create()
2503 *error = "Error creating cache's migration mempool"; in cache_create()
2507 cache->need_tick_bio = true; in cache_create()
2508 cache->sized = false; in cache_create()
2509 cache->invalidate = false; in cache_create()
2510 cache->commit_requested = false; in cache_create()
2511 cache->loaded_mappings = false; in cache_create()
2512 cache->loaded_discards = false; in cache_create()
2514 load_stats(cache); in cache_create()
2516 atomic_set(&cache->stats.demotion, 0); in cache_create()
2517 atomic_set(&cache->stats.promotion, 0); in cache_create()
2518 atomic_set(&cache->stats.copies_avoided, 0); in cache_create()
2519 atomic_set(&cache->stats.cache_cell_clash, 0); in cache_create()
2520 atomic_set(&cache->stats.commit_count, 0); in cache_create()
2521 atomic_set(&cache->stats.discard_count, 0); in cache_create()
2523 spin_lock_init(&cache->invalidation_lock); in cache_create()
2524 INIT_LIST_HEAD(&cache->invalidation_requests); in cache_create()
2526 batcher_init(&cache->committer, commit_op, cache, in cache_create()
2527 issue_op, cache, cache->wq); in cache_create()
2528 dm_iot_init(&cache->tracker); in cache_create()
2530 init_rwsem(&cache->background_work_lock); in cache_create()
2531 prevent_background_work(cache); in cache_create()
2533 *result = cache; in cache_create()
2536 destroy(cache); in cache_create()
2540 static int copy_ctr_args(struct cache *cache, int argc, const char **argv) in copy_ctr_args() argument
2558 cache->nr_ctr_args = argc; in copy_ctr_args()
2559 cache->ctr_args = copy; in copy_ctr_args()
2568 struct cache *cache = NULL; in cache_ctr() local
2572 ti->error = "Error allocating memory for cache"; in cache_ctr()
2581 r = cache_create(ca, &cache); in cache_ctr()
2585 r = copy_ctr_args(cache, argc - 3, (const char **)argv + 3); in cache_ctr()
2587 destroy(cache); in cache_ctr()
2591 ti->private = cache; in cache_ctr()
2601 struct cache *cache = ti->private; in cache_map() local
2605 dm_oblock_t block = get_bio_block(cache, bio); in cache_map()
2608 if (unlikely(from_oblock(block) >= from_oblock(cache->origin_blocks))) { in cache_map()
2611 * the end of the origin device. We don't cache these. in cache_map()
2614 remap_to_origin(cache, bio); in cache_map()
2615 accounted_begin(cache, bio); in cache_map()
2620 defer_bio(cache, bio); in cache_map()
2624 r = map_bio(cache, bio, block, &commit_needed); in cache_map()
2626 schedule_commit(&cache->committer); in cache_map()
2633 struct cache *cache = ti->private; in cache_end_io() local
2638 policy_tick(cache->policy, false); in cache_end_io()
2640 spin_lock_irqsave(&cache->lock, flags); in cache_end_io()
2641 cache->need_tick_bio = true; in cache_end_io()
2642 spin_unlock_irqrestore(&cache->lock, flags); in cache_end_io()
2645 bio_drop_shared_lock(cache, bio); in cache_end_io()
2646 accounted_complete(cache, bio); in cache_end_io()
2651 static int write_dirty_bitset(struct cache *cache) in write_dirty_bitset() argument
2655 if (get_cache_mode(cache) >= CM_READ_ONLY) in write_dirty_bitset()
2658 r = dm_cache_set_dirty_bits(cache->cmd, from_cblock(cache->cache_size), cache->dirty_bitset); in write_dirty_bitset()
2660 metadata_operation_failed(cache, "dm_cache_set_dirty_bits", r); in write_dirty_bitset()
2665 static int write_discard_bitset(struct cache *cache) in write_discard_bitset() argument
2669 if (get_cache_mode(cache) >= CM_READ_ONLY) in write_discard_bitset()
2672 r = dm_cache_discard_bitset_resize(cache->cmd, cache->discard_block_size, in write_discard_bitset()
2673 cache->discard_nr_blocks); in write_discard_bitset()
2675 DMERR("%s: could not resize on-disk discard bitset", cache_device_name(cache)); in write_discard_bitset()
2676 metadata_operation_failed(cache, "dm_cache_discard_bitset_resize", r); in write_discard_bitset()
2680 for (i = 0; i < from_dblock(cache->discard_nr_blocks); i++) { in write_discard_bitset()
2681 r = dm_cache_set_discard(cache->cmd, to_dblock(i), in write_discard_bitset()
2682 is_discarded(cache, to_dblock(i))); in write_discard_bitset()
2684 metadata_operation_failed(cache, "dm_cache_set_discard", r); in write_discard_bitset()
2692 static int write_hints(struct cache *cache) in write_hints() argument
2696 if (get_cache_mode(cache) >= CM_READ_ONLY) in write_hints()
2699 r = dm_cache_write_hints(cache->cmd, cache->policy); in write_hints()
2701 metadata_operation_failed(cache, "dm_cache_write_hints", r); in write_hints()
2711 static bool sync_metadata(struct cache *cache) in sync_metadata() argument
2715 r1 = write_dirty_bitset(cache); in sync_metadata()
2717 DMERR("%s: could not write dirty bitset", cache_device_name(cache)); in sync_metadata()
2719 r2 = write_discard_bitset(cache); in sync_metadata()
2721 DMERR("%s: could not write discard bitset", cache_device_name(cache)); in sync_metadata()
2723 save_stats(cache); in sync_metadata()
2725 r3 = write_hints(cache); in sync_metadata()
2727 DMERR("%s: could not write hints", cache_device_name(cache)); in sync_metadata()
2734 r4 = commit(cache, !r1 && !r2 && !r3); in sync_metadata()
2736 DMERR("%s: could not write cache metadata", cache_device_name(cache)); in sync_metadata()
2743 struct cache *cache = ti->private; in cache_postsuspend() local
2745 prevent_background_work(cache); in cache_postsuspend()
2746 BUG_ON(atomic_read(&cache->nr_io_migrations)); in cache_postsuspend()
2748 cancel_delayed_work_sync(&cache->waker); in cache_postsuspend()
2749 drain_workqueue(cache->wq); in cache_postsuspend()
2750 WARN_ON(cache->tracker.in_flight); in cache_postsuspend()
2756 requeue_deferred_bios(cache); in cache_postsuspend()
2758 if (get_cache_mode(cache) == CM_WRITE) in cache_postsuspend()
2759 (void) sync_metadata(cache); in cache_postsuspend()
2765 struct cache *cache = context; in load_mapping() local
2768 set_bit(from_cblock(cblock), cache->dirty_bitset); in load_mapping()
2769 atomic_inc(&cache->nr_dirty); in load_mapping()
2771 clear_bit(from_cblock(cblock), cache->dirty_bitset); in load_mapping()
2773 return policy_load_mapping(cache->policy, oblock, cblock, dirty, hint, hint_valid); in load_mapping()
2783 struct cache *cache; member
2793 static void discard_load_info_init(struct cache *cache, in discard_load_info_init() argument
2796 li->cache = cache; in discard_load_info_init()
2816 b = dm_sector_div_up(b, li->cache->discard_block_size); in set_discard_range()
2817 sector_div(e, li->cache->discard_block_size); in set_discard_range()
2823 if (e > from_dblock(li->cache->discard_nr_blocks)) in set_discard_range()
2824 e = from_dblock(li->cache->discard_nr_blocks); in set_discard_range()
2827 set_discard(li->cache, to_dblock(b)); in set_discard_range()
2860 static dm_cblock_t get_cache_dev_size(struct cache *cache) in get_cache_dev_size() argument
2862 sector_t size = get_dev_size(cache->cache_dev); in get_cache_dev_size()
2863 (void) sector_div(size, cache->sectors_per_block); in get_cache_dev_size()
2867 static bool can_resize(struct cache *cache, dm_cblock_t new_size) in can_resize() argument
2869 if (from_cblock(new_size) > from_cblock(cache->cache_size)) { in can_resize()
2870 if (cache->sized) { in can_resize()
2871 DMERR("%s: unable to extend cache due to missing cache table reload", in can_resize()
2872 cache_device_name(cache)); in can_resize()
2878 * We can't drop a dirty block when shrinking the cache. in can_resize()
2880 while (from_cblock(new_size) < from_cblock(cache->cache_size)) { in can_resize()
2882 if (is_dirty(cache, new_size)) { in can_resize()
2883 DMERR("%s: unable to shrink cache; cache block %llu is dirty", in can_resize()
2884 cache_device_name(cache), in can_resize()
2893 static int resize_cache_dev(struct cache *cache, dm_cblock_t new_size) in resize_cache_dev() argument
2897 r = dm_cache_resize(cache->cmd, new_size); in resize_cache_dev()
2899 DMERR("%s: could not resize cache metadata", cache_device_name(cache)); in resize_cache_dev()
2900 metadata_operation_failed(cache, "dm_cache_resize", r); in resize_cache_dev()
2904 set_cache_size(cache, new_size); in resize_cache_dev()
2912 struct cache *cache = ti->private; in cache_preresume() local
2913 dm_cblock_t csize = get_cache_dev_size(cache); in cache_preresume()
2916 * Check to see if the cache has resized. in cache_preresume()
2918 if (!cache->sized) { in cache_preresume()
2919 r = resize_cache_dev(cache, csize); in cache_preresume()
2923 cache->sized = true; in cache_preresume()
2925 } else if (csize != cache->cache_size) { in cache_preresume()
2926 if (!can_resize(cache, csize)) in cache_preresume()
2929 r = resize_cache_dev(cache, csize); in cache_preresume()
2934 if (!cache->loaded_mappings) { in cache_preresume()
2935 r = dm_cache_load_mappings(cache->cmd, cache->policy, in cache_preresume()
2936 load_mapping, cache); in cache_preresume()
2938 DMERR("%s: could not load cache mappings", cache_device_name(cache)); in cache_preresume()
2939 metadata_operation_failed(cache, "dm_cache_load_mappings", r); in cache_preresume()
2943 cache->loaded_mappings = true; in cache_preresume()
2946 if (!cache->loaded_discards) { in cache_preresume()
2954 clear_bitset(cache->discard_bitset, from_dblock(cache->discard_nr_blocks)); in cache_preresume()
2956 discard_load_info_init(cache, &li); in cache_preresume()
2957 r = dm_cache_load_discards(cache->cmd, load_discard, &li); in cache_preresume()
2959 DMERR("%s: could not load origin discards", cache_device_name(cache)); in cache_preresume()
2960 metadata_operation_failed(cache, "dm_cache_load_discards", r); in cache_preresume()
2965 cache->loaded_discards = true; in cache_preresume()
2973 struct cache *cache = ti->private; in cache_resume() local
2975 cache->need_tick_bio = true; in cache_resume()
2976 allow_background_work(cache); in cache_resume()
2977 do_waker(&cache->waker.work); in cache_resume()
2980 static void emit_flags(struct cache *cache, char *result, in emit_flags() argument
2984 struct cache_features *cf = &cache->features; in emit_flags()
2992 if (writethrough_mode(cache)) in emit_flags()
2995 else if (passthrough_mode(cache)) in emit_flags()
2998 else if (writeback_mode(cache)) in emit_flags()
3004 cache_device_name(cache), (int) cf->io_mode); in emit_flags()
3017 * <cache block size> <#used cache blocks>/<#total cache blocks>
3022 * <policy name> <#policy args> <policy args>* <cache metadata mode> <needs_check>
3033 struct cache *cache = ti->private; in cache_status() local
3039 if (get_cache_mode(cache) == CM_FAIL) { in cache_status()
3046 (void) commit(cache, false); in cache_status()
3048 r = dm_cache_get_free_metadata_block_count(cache->cmd, &nr_free_blocks_metadata); in cache_status()
3051 cache_device_name(cache), r); in cache_status()
3055 r = dm_cache_get_metadata_dev_size(cache->cmd, &nr_blocks_metadata); in cache_status()
3058 cache_device_name(cache), r); in cache_status()
3062 residency = policy_residency(cache->policy); in cache_status()
3068 (unsigned long long)cache->sectors_per_block, in cache_status()
3070 (unsigned long long) from_cblock(cache->cache_size), in cache_status()
3071 (unsigned) atomic_read(&cache->stats.read_hit), in cache_status()
3072 (unsigned) atomic_read(&cache->stats.read_miss), in cache_status()
3073 (unsigned) atomic_read(&cache->stats.write_hit), in cache_status()
3074 (unsigned) atomic_read(&cache->stats.write_miss), in cache_status()
3075 (unsigned) atomic_read(&cache->stats.demotion), in cache_status()
3076 (unsigned) atomic_read(&cache->stats.promotion), in cache_status()
3077 (unsigned long) atomic_read(&cache->nr_dirty)); in cache_status()
3079 emit_flags(cache, result, maxlen, &sz); in cache_status()
3081 DMEMIT("2 migration_threshold %llu ", (unsigned long long) cache->migration_threshold); in cache_status()
3083 DMEMIT("%s ", dm_cache_policy_get_name(cache->policy)); in cache_status()
3085 r = policy_emit_config_values(cache->policy, result, maxlen, &sz); in cache_status()
3088 cache_device_name(cache), r); in cache_status()
3091 if (get_cache_mode(cache) == CM_READ_ONLY) in cache_status()
3096 r = dm_cache_metadata_needs_check(cache->cmd, &needs_check); in cache_status()
3106 format_dev_t(buf, cache->metadata_dev->bdev->bd_dev); in cache_status()
3108 format_dev_t(buf, cache->cache_dev->bdev->bd_dev); in cache_status()
3110 format_dev_t(buf, cache->origin_dev->bdev->bd_dev); in cache_status()
3113 for (i = 0; i < cache->nr_ctr_args - 1; i++) in cache_status()
3114 DMEMIT(" %s", cache->ctr_args[i]); in cache_status()
3115 if (cache->nr_ctr_args) in cache_status()
3116 DMEMIT(" %s", cache->ctr_args[cache->nr_ctr_args - 1]); in cache_status()
3121 if (get_cache_mode(cache) == CM_FAIL) in cache_status()
3123 else if (get_cache_mode(cache) == CM_READ_ONLY) in cache_status()
3128 format_dev_t(buf, cache->metadata_dev->bdev->bd_dev); in cache_status()
3130 format_dev_t(buf, cache->cache_dev->bdev->bd_dev); in cache_status()
3132 format_dev_t(buf, cache->origin_dev->bdev->bd_dev); in cache_status()
3134 DMEMIT(",writethrough=%c", writethrough_mode(cache) ? 'y' : 'n'); in cache_status()
3135 DMEMIT(",writeback=%c", writeback_mode(cache) ? 'y' : 'n'); in cache_status()
3136 DMEMIT(",passthrough=%c", passthrough_mode(cache) ? 'y' : 'n'); in cache_status()
3137 DMEMIT(",metadata2=%c", cache->features.metadata_version == 2 ? 'y' : 'n'); in cache_status()
3138 DMEMIT(",no_discard_passdown=%c", cache->features.discard_passdown ? 'n' : 'y'); in cache_status()
3159 * A cache block range can take two forms:
3164 static int parse_cblock_range(struct cache *cache, const char *str, in parse_cblock_range() argument
3197 DMERR("%s: invalid cblock range '%s'", cache_device_name(cache), str); in parse_cblock_range()
3201 static int validate_cblock_range(struct cache *cache, struct cblock_range *range) in validate_cblock_range() argument
3205 uint64_t n = from_cblock(cache->cache_size); in validate_cblock_range()
3209 cache_device_name(cache), b, n); in validate_cblock_range()
3215 cache_device_name(cache), e, n); in validate_cblock_range()
3221 cache_device_name(cache), b, e); in validate_cblock_range()
3233 static int request_invalidation(struct cache *cache, struct cblock_range *range) in request_invalidation() argument
3244 r = invalidate_cblock(cache, range->begin); in request_invalidation()
3251 cache->commit_requested = true; in request_invalidation()
3255 static int process_invalidate_cblocks_message(struct cache *cache, unsigned count, in process_invalidate_cblocks_message() argument
3262 if (!passthrough_mode(cache)) { in process_invalidate_cblocks_message()
3263 DMERR("%s: cache has to be in passthrough mode for invalidation", in process_invalidate_cblocks_message()
3264 cache_device_name(cache)); in process_invalidate_cblocks_message()
3269 r = parse_cblock_range(cache, cblock_ranges[i], &range); in process_invalidate_cblocks_message()
3273 r = validate_cblock_range(cache, &range); in process_invalidate_cblocks_message()
3280 r = request_invalidation(cache, &range); in process_invalidate_cblocks_message()
3294 * The key migration_threshold is supported by the cache target core.
3299 struct cache *cache = ti->private; in cache_message() local
3304 if (get_cache_mode(cache) >= CM_READ_ONLY) { in cache_message()
3305 DMERR("%s: unable to service cache target messages in READ_ONLY or FAIL mode", in cache_message()
3306 cache_device_name(cache)); in cache_message()
3311 return process_invalidate_cblocks_message(cache, argc - 1, (const char **) argv + 1); in cache_message()
3316 return set_config_value(cache, argv[0], argv[1]); in cache_message()
3323 struct cache *cache = ti->private; in cache_iterate_devices() local
3325 r = fn(ti, cache->cache_dev, 0, get_dev_size(cache->cache_dev), data); in cache_iterate_devices()
3327 r = fn(ti, cache->origin_dev, 0, ti->len, data); in cache_iterate_devices()
3336 static void disable_passdown_if_not_supported(struct cache *cache) in disable_passdown_if_not_supported() argument
3338 struct block_device *origin_bdev = cache->origin_dev->bdev; in disable_passdown_if_not_supported()
3342 if (!cache->features.discard_passdown) in disable_passdown_if_not_supported()
3348 else if (origin_limits->max_discard_sectors < cache->sectors_per_block) in disable_passdown_if_not_supported()
3354 cache->features.discard_passdown = false; in disable_passdown_if_not_supported()
3358 static void set_discard_limits(struct cache *cache, struct queue_limits *limits) in set_discard_limits() argument
3360 struct block_device *origin_bdev = cache->origin_dev->bdev; in set_discard_limits()
3363 if (!cache->features.discard_passdown) { in set_discard_limits()
3365 limits->max_discard_sectors = min_t(sector_t, cache->discard_block_size * 1024, in set_discard_limits()
3366 cache->origin_sectors); in set_discard_limits()
3367 limits->discard_granularity = cache->discard_block_size << SECTOR_SHIFT; in set_discard_limits()
3384 struct cache *cache = ti->private; in cache_io_hints() local
3389 * cache's blocksize (io_opt is a factor) do not override them. in cache_io_hints()
3391 if (io_opt_sectors < cache->sectors_per_block || in cache_io_hints()
3392 do_div(io_opt_sectors, cache->sectors_per_block)) { in cache_io_hints()
3393 blk_limits_io_min(limits, cache->sectors_per_block << SECTOR_SHIFT); in cache_io_hints()
3394 blk_limits_io_opt(limits, cache->sectors_per_block << SECTOR_SHIFT); in cache_io_hints()
3397 disable_passdown_if_not_supported(cache); in cache_io_hints()
3398 set_discard_limits(cache, limits); in cache_io_hints()
3404 .name = "cache",
3430 DMERR("cache target registration failed: %d", r); in dm_cache_init()
3447 MODULE_DESCRIPTION(DM_NAME " cache target");