Lines Matching full:cache
10 #include "dm-cache-metadata.h"
22 #define DM_MSG_PREFIX "cache"
25 "A percentage of time allocated for copying to and/or from cache");
33 * cblock: index of a cache block
34 * promotion: movement of a block from origin to cache
35 * demotion: movement of a block from cache to origin
36 * migration: movement of a block between the origin and cache device,
310 * The block size of the device holding cache data must be
325 * dirty. If you lose the cache device you will lose data.
331 * Data is written to both cache and origin. Blocks are never
337 * A degraded mode useful for various cache coherency situations
339 * origin. If a write goes to a cached oblock, then the cache
366 struct cache { struct
400 * Size of the cache device in blocks. argument
455 * Cache features such as write-through.
490 struct cache *cache; argument
502 static bool writethrough_mode(struct cache *cache) in writethrough_mode() argument
504 return cache->features.io_mode == CM_IO_WRITETHROUGH; in writethrough_mode()
507 static bool writeback_mode(struct cache *cache) in writeback_mode() argument
509 return cache->features.io_mode == CM_IO_WRITEBACK; in writeback_mode()
512 static inline bool passthrough_mode(struct cache *cache) in passthrough_mode() argument
514 return unlikely(cache->features.io_mode == CM_IO_PASSTHROUGH); in passthrough_mode()
519 static void wake_deferred_bio_worker(struct cache *cache) in wake_deferred_bio_worker() argument
521 queue_work(cache->wq, &cache->deferred_bio_worker); in wake_deferred_bio_worker()
524 static void wake_migration_worker(struct cache *cache) in wake_migration_worker() argument
526 if (passthrough_mode(cache)) in wake_migration_worker()
529 queue_work(cache->wq, &cache->migration_worker); in wake_migration_worker()
534 static struct dm_bio_prison_cell_v2 *alloc_prison_cell(struct cache *cache) in alloc_prison_cell() argument
536 return dm_bio_prison_alloc_cell_v2(cache->prison, GFP_NOIO); in alloc_prison_cell()
539 static void free_prison_cell(struct cache *cache, struct dm_bio_prison_cell_v2 *cell) in free_prison_cell() argument
541 dm_bio_prison_free_cell_v2(cache->prison, cell); in free_prison_cell()
544 static struct dm_cache_migration *alloc_migration(struct cache *cache) in alloc_migration() argument
548 mg = mempool_alloc(&cache->migration_pool, GFP_NOIO); in alloc_migration()
552 mg->cache = cache; in alloc_migration()
553 atomic_inc(&cache->nr_allocated_migrations); in alloc_migration()
560 struct cache *cache = mg->cache; in free_migration() local
562 if (atomic_dec_and_test(&cache->nr_allocated_migrations)) in free_migration()
563 wake_up(&cache->migration_wait); in free_migration()
565 mempool_free(mg, &cache->migration_pool); in free_migration()
622 static void defer_bio(struct cache *cache, struct bio *bio) in defer_bio() argument
624 spin_lock_irq(&cache->lock); in defer_bio()
625 bio_list_add(&cache->deferred_bios, bio); in defer_bio()
626 spin_unlock_irq(&cache->lock); in defer_bio()
628 wake_deferred_bio_worker(cache); in defer_bio()
631 static void defer_bios(struct cache *cache, struct bio_list *bios) in defer_bios() argument
633 spin_lock_irq(&cache->lock); in defer_bios()
634 bio_list_merge(&cache->deferred_bios, bios); in defer_bios()
636 spin_unlock_irq(&cache->lock); in defer_bios()
638 wake_deferred_bio_worker(cache); in defer_bios()
643 static bool bio_detain_shared(struct cache *cache, dm_oblock_t oblock, struct bio *bio) in bio_detain_shared() argument
651 cell_prealloc = alloc_prison_cell(cache); /* FIXME: allow wait if calling from worker */ in bio_detain_shared()
654 r = dm_cell_get_v2(cache->prison, &key, lock_level(bio), bio, cell_prealloc, &cell); in bio_detain_shared()
659 free_prison_cell(cache, cell_prealloc); in bio_detain_shared()
664 free_prison_cell(cache, cell_prealloc); in bio_detain_shared()
674 static bool is_dirty(struct cache *cache, dm_cblock_t b) in is_dirty() argument
676 return test_bit(from_cblock(b), cache->dirty_bitset); in is_dirty()
679 static void set_dirty(struct cache *cache, dm_cblock_t cblock) in set_dirty() argument
681 if (!test_and_set_bit(from_cblock(cblock), cache->dirty_bitset)) { in set_dirty()
682 atomic_inc(&cache->nr_dirty); in set_dirty()
683 policy_set_dirty(cache->policy, cblock); in set_dirty()
691 static void force_set_dirty(struct cache *cache, dm_cblock_t cblock) in force_set_dirty() argument
693 if (!test_and_set_bit(from_cblock(cblock), cache->dirty_bitset)) in force_set_dirty()
694 atomic_inc(&cache->nr_dirty); in force_set_dirty()
695 policy_set_dirty(cache->policy, cblock); in force_set_dirty()
698 static void force_clear_dirty(struct cache *cache, dm_cblock_t cblock) in force_clear_dirty() argument
700 if (test_and_clear_bit(from_cblock(cblock), cache->dirty_bitset)) { in force_clear_dirty()
701 if (atomic_dec_return(&cache->nr_dirty) == 0) in force_clear_dirty()
702 dm_table_event(cache->ti->table); in force_clear_dirty()
705 policy_clear_dirty(cache->policy, cblock); in force_clear_dirty()
710 static bool block_size_is_power_of_two(struct cache *cache) in block_size_is_power_of_two() argument
712 return cache->sectors_per_block_shift >= 0; in block_size_is_power_of_two()
722 static dm_block_t oblocks_per_dblock(struct cache *cache) in oblocks_per_dblock() argument
724 dm_block_t oblocks = cache->discard_block_size; in oblocks_per_dblock()
726 if (block_size_is_power_of_two(cache)) in oblocks_per_dblock()
727 oblocks >>= cache->sectors_per_block_shift; in oblocks_per_dblock()
729 oblocks = block_div(oblocks, cache->sectors_per_block); in oblocks_per_dblock()
734 static dm_dblock_t oblock_to_dblock(struct cache *cache, dm_oblock_t oblock) in oblock_to_dblock() argument
737 oblocks_per_dblock(cache))); in oblock_to_dblock()
740 static void set_discard(struct cache *cache, dm_dblock_t b) in set_discard() argument
742 BUG_ON(from_dblock(b) >= from_dblock(cache->discard_nr_blocks)); in set_discard()
743 atomic_inc(&cache->stats.discard_count); in set_discard()
745 spin_lock_irq(&cache->lock); in set_discard()
746 set_bit(from_dblock(b), cache->discard_bitset); in set_discard()
747 spin_unlock_irq(&cache->lock); in set_discard()
750 static void clear_discard(struct cache *cache, dm_dblock_t b) in clear_discard() argument
752 spin_lock_irq(&cache->lock); in clear_discard()
753 clear_bit(from_dblock(b), cache->discard_bitset); in clear_discard()
754 spin_unlock_irq(&cache->lock); in clear_discard()
757 static bool is_discarded(struct cache *cache, dm_dblock_t b) in is_discarded() argument
760 spin_lock_irq(&cache->lock); in is_discarded()
761 r = test_bit(from_dblock(b), cache->discard_bitset); in is_discarded()
762 spin_unlock_irq(&cache->lock); in is_discarded()
767 static bool is_discarded_oblock(struct cache *cache, dm_oblock_t b) in is_discarded_oblock() argument
770 spin_lock_irq(&cache->lock); in is_discarded_oblock()
771 r = test_bit(from_dblock(oblock_to_dblock(cache, b)), in is_discarded_oblock()
772 cache->discard_bitset); in is_discarded_oblock()
773 spin_unlock_irq(&cache->lock); in is_discarded_oblock()
781 static void remap_to_origin(struct cache *cache, struct bio *bio) in remap_to_origin() argument
783 bio_set_dev(bio, cache->origin_dev->bdev); in remap_to_origin()
786 static void remap_to_cache(struct cache *cache, struct bio *bio, in remap_to_cache() argument
792 bio_set_dev(bio, cache->cache_dev->bdev); in remap_to_cache()
793 if (!block_size_is_power_of_two(cache)) in remap_to_cache()
795 (block * cache->sectors_per_block) + in remap_to_cache()
796 sector_div(bi_sector, cache->sectors_per_block); in remap_to_cache()
799 (block << cache->sectors_per_block_shift) | in remap_to_cache()
800 (bi_sector & (cache->sectors_per_block - 1)); in remap_to_cache()
803 static void check_if_tick_bio_needed(struct cache *cache, struct bio *bio) in check_if_tick_bio_needed() argument
807 spin_lock_irq(&cache->lock); in check_if_tick_bio_needed()
808 if (cache->need_tick_bio && !op_is_flush(bio->bi_opf) && in check_if_tick_bio_needed()
812 cache->need_tick_bio = false; in check_if_tick_bio_needed()
814 spin_unlock_irq(&cache->lock); in check_if_tick_bio_needed()
817 static void __remap_to_origin_clear_discard(struct cache *cache, struct bio *bio, in __remap_to_origin_clear_discard() argument
821 check_if_tick_bio_needed(cache, bio); in __remap_to_origin_clear_discard()
822 remap_to_origin(cache, bio); in __remap_to_origin_clear_discard()
824 clear_discard(cache, oblock_to_dblock(cache, oblock)); in __remap_to_origin_clear_discard()
827 static void remap_to_origin_clear_discard(struct cache *cache, struct bio *bio, in remap_to_origin_clear_discard() argument
831 __remap_to_origin_clear_discard(cache, bio, oblock, true); in remap_to_origin_clear_discard()
834 static void remap_to_cache_dirty(struct cache *cache, struct bio *bio, in remap_to_cache_dirty() argument
837 check_if_tick_bio_needed(cache, bio); in remap_to_cache_dirty()
838 remap_to_cache(cache, bio, cblock); in remap_to_cache_dirty()
840 set_dirty(cache, cblock); in remap_to_cache_dirty()
841 clear_discard(cache, oblock_to_dblock(cache, oblock)); in remap_to_cache_dirty()
845 static dm_oblock_t get_bio_block(struct cache *cache, struct bio *bio) in get_bio_block() argument
849 if (!block_size_is_power_of_two(cache)) in get_bio_block()
850 (void) sector_div(block_nr, cache->sectors_per_block); in get_bio_block()
852 block_nr >>= cache->sectors_per_block_shift; in get_bio_block()
857 static bool accountable_bio(struct cache *cache, struct bio *bio) in accountable_bio() argument
862 static void accounted_begin(struct cache *cache, struct bio *bio) in accounted_begin() argument
866 if (accountable_bio(cache, bio)) { in accounted_begin()
869 iot_io_begin(&cache->tracker, pb->len); in accounted_begin()
873 static void accounted_complete(struct cache *cache, struct bio *bio) in accounted_complete() argument
877 iot_io_end(&cache->tracker, pb->len); in accounted_complete()
880 static void accounted_request(struct cache *cache, struct bio *bio) in accounted_request() argument
882 accounted_begin(cache, bio); in accounted_request()
888 struct cache *cache = context; in issue_op() local
889 accounted_request(cache, bio); in issue_op()
894 * to both the cache and origin devices. Clone the bio and send them in parallel.
896 static void remap_to_origin_and_cache(struct cache *cache, struct bio *bio, in remap_to_origin_and_cache() argument
899 struct bio *origin_bio = bio_clone_fast(bio, GFP_NOIO, &cache->bs); in remap_to_origin_and_cache()
908 __remap_to_origin_clear_discard(cache, origin_bio, oblock, false); in remap_to_origin_and_cache()
911 remap_to_cache(cache, bio, cblock); in remap_to_origin_and_cache()
917 static enum cache_metadata_mode get_cache_mode(struct cache *cache) in get_cache_mode() argument
919 return cache->features.mode; in get_cache_mode()
922 static const char *cache_device_name(struct cache *cache) in cache_device_name() argument
924 return dm_table_device_name(cache->ti->table); in cache_device_name()
927 static void notify_mode_switch(struct cache *cache, enum cache_metadata_mode mode) in notify_mode_switch() argument
935 dm_table_event(cache->ti->table); in notify_mode_switch()
936 DMINFO("%s: switching cache to %s mode", in notify_mode_switch()
937 cache_device_name(cache), descs[(int)mode]); in notify_mode_switch()
940 static void set_cache_mode(struct cache *cache, enum cache_metadata_mode new_mode) in set_cache_mode() argument
943 enum cache_metadata_mode old_mode = get_cache_mode(cache); in set_cache_mode()
945 if (dm_cache_metadata_needs_check(cache->cmd, &needs_check)) { in set_cache_mode()
947 cache_device_name(cache)); in set_cache_mode()
952 DMERR("%s: unable to switch cache to write mode until repaired.", in set_cache_mode()
953 cache_device_name(cache)); in set_cache_mode()
967 dm_cache_metadata_set_read_only(cache->cmd); in set_cache_mode()
971 dm_cache_metadata_set_read_write(cache->cmd); in set_cache_mode()
975 cache->features.mode = new_mode; in set_cache_mode()
978 notify_mode_switch(cache, new_mode); in set_cache_mode()
981 static void abort_transaction(struct cache *cache) in abort_transaction() argument
983 const char *dev_name = cache_device_name(cache); in abort_transaction()
985 if (get_cache_mode(cache) >= CM_READ_ONLY) in abort_transaction()
988 if (dm_cache_metadata_set_needs_check(cache->cmd)) { in abort_transaction()
990 set_cache_mode(cache, CM_FAIL); in abort_transaction()
994 if (dm_cache_metadata_abort(cache->cmd)) { in abort_transaction()
996 set_cache_mode(cache, CM_FAIL); in abort_transaction()
1000 static void metadata_operation_failed(struct cache *cache, const char *op, int r) in metadata_operation_failed() argument
1003 cache_device_name(cache), op, r); in metadata_operation_failed()
1004 abort_transaction(cache); in metadata_operation_failed()
1005 set_cache_mode(cache, CM_READ_ONLY); in metadata_operation_failed()
1010 static void load_stats(struct cache *cache) in load_stats() argument
1014 dm_cache_metadata_get_stats(cache->cmd, &stats); in load_stats()
1015 atomic_set(&cache->stats.read_hit, stats.read_hits); in load_stats()
1016 atomic_set(&cache->stats.read_miss, stats.read_misses); in load_stats()
1017 atomic_set(&cache->stats.write_hit, stats.write_hits); in load_stats()
1018 atomic_set(&cache->stats.write_miss, stats.write_misses); in load_stats()
1021 static void save_stats(struct cache *cache) in save_stats() argument
1025 if (get_cache_mode(cache) >= CM_READ_ONLY) in save_stats()
1028 stats.read_hits = atomic_read(&cache->stats.read_hit); in save_stats()
1029 stats.read_misses = atomic_read(&cache->stats.read_miss); in save_stats()
1030 stats.write_hits = atomic_read(&cache->stats.write_hit); in save_stats()
1031 stats.write_misses = atomic_read(&cache->stats.write_miss); in save_stats()
1033 dm_cache_metadata_set_stats(cache->cmd, &stats); in save_stats()
1056 * Migration covers moving data from the origin device to the cache, or
1060 static void inc_io_migrations(struct cache *cache) in inc_io_migrations() argument
1062 atomic_inc(&cache->nr_io_migrations); in inc_io_migrations()
1065 static void dec_io_migrations(struct cache *cache) in dec_io_migrations() argument
1067 atomic_dec(&cache->nr_io_migrations); in dec_io_migrations()
1075 static void calc_discard_block_range(struct cache *cache, struct bio *bio, in calc_discard_block_range() argument
1081 *b = to_dblock(dm_sector_div_up(sb, cache->discard_block_size)); in calc_discard_block_range()
1083 if (se - sb < cache->discard_block_size) in calc_discard_block_range()
1086 *e = to_dblock(block_div(se, cache->discard_block_size)); in calc_discard_block_range()
1091 static void prevent_background_work(struct cache *cache) in prevent_background_work() argument
1094 down_write(&cache->background_work_lock); in prevent_background_work()
1098 static void allow_background_work(struct cache *cache) in allow_background_work() argument
1101 up_write(&cache->background_work_lock); in allow_background_work()
1105 static bool background_work_begin(struct cache *cache) in background_work_begin() argument
1110 r = down_read_trylock(&cache->background_work_lock); in background_work_begin()
1116 static void background_work_end(struct cache *cache) in background_work_end() argument
1119 up_read(&cache->background_work_lock); in background_work_end()
1125 static bool bio_writes_complete_block(struct cache *cache, struct bio *bio) in bio_writes_complete_block() argument
1128 (bio->bi_iter.bi_size == (cache->sectors_per_block << SECTOR_SHIFT)); in bio_writes_complete_block()
1131 static bool optimisable_bio(struct cache *cache, struct bio *bio, dm_oblock_t block) in optimisable_bio() argument
1133 return writeback_mode(cache) && in optimisable_bio()
1134 (is_discarded_oblock(cache, block) || bio_writes_complete_block(cache, bio)); in optimisable_bio()
1141 dm_cell_quiesce_v2(mg->cache->prison, mg->cell, &mg->k.ws); in quiesce()
1157 queue_continuation(mg->cache->wq, &mg->k); in copy_complete()
1163 struct cache *cache = mg->cache; in copy() local
1165 o_region.bdev = cache->origin_dev->bdev; in copy()
1166 o_region.sector = from_oblock(mg->op->oblock) * cache->sectors_per_block; in copy()
1167 o_region.count = cache->sectors_per_block; in copy()
1169 c_region.bdev = cache->cache_dev->bdev; in copy()
1170 c_region.sector = from_cblock(mg->op->cblock) * cache->sectors_per_block; in copy()
1171 c_region.count = cache->sectors_per_block; in copy()
1174 dm_kcopyd_copy(cache->copier, &o_region, 1, &c_region, 0, copy_complete, &mg->k); in copy()
1176 dm_kcopyd_copy(cache->copier, &c_region, 1, &o_region, 0, copy_complete, &mg->k); in copy()
1179 static void bio_drop_shared_lock(struct cache *cache, struct bio *bio) in bio_drop_shared_lock() argument
1183 if (pb->cell && dm_cell_put_v2(cache->prison, pb->cell)) in bio_drop_shared_lock()
1184 free_prison_cell(cache, pb->cell); in bio_drop_shared_lock()
1191 struct cache *cache = mg->cache; in overwrite_endio() local
1199 queue_continuation(cache->wq, &mg->k); in overwrite_endio()
1215 remap_to_cache(mg->cache, bio, mg->op->cblock); in overwrite()
1217 remap_to_origin(mg->cache, bio); in overwrite()
1220 accounted_request(mg->cache, bio); in overwrite()
1237 struct cache *cache = mg->cache; in mg_complete() local
1242 update_stats(&cache->stats, op->op); in mg_complete()
1246 clear_discard(cache, oblock_to_dblock(cache, op->oblock)); in mg_complete()
1247 policy_complete_background_work(cache->policy, op, success); in mg_complete()
1251 force_set_dirty(cache, cblock); in mg_complete()
1259 force_clear_dirty(cache, cblock); in mg_complete()
1260 dec_io_migrations(cache); in mg_complete()
1269 force_clear_dirty(cache, cblock); in mg_complete()
1270 policy_complete_background_work(cache->policy, op, success); in mg_complete()
1271 dec_io_migrations(cache); in mg_complete()
1276 force_clear_dirty(cache, cblock); in mg_complete()
1277 policy_complete_background_work(cache->policy, op, success); in mg_complete()
1278 dec_io_migrations(cache); in mg_complete()
1284 if (dm_cell_unlock_v2(cache->prison, mg->cell, &bios)) in mg_complete()
1285 free_prison_cell(cache, mg->cell); in mg_complete()
1289 defer_bios(cache, &bios); in mg_complete()
1290 wake_migration_worker(cache); in mg_complete()
1292 background_work_end(cache); in mg_complete()
1305 struct cache *cache = mg->cache; in mg_update_metadata() local
1310 r = dm_cache_insert_mapping(cache->cmd, op->cblock, op->oblock); in mg_update_metadata()
1313 cache_device_name(cache)); in mg_update_metadata()
1314 metadata_operation_failed(cache, "dm_cache_insert_mapping", r); in mg_update_metadata()
1323 r = dm_cache_remove_mapping(cache->cmd, op->cblock); in mg_update_metadata()
1326 cache_device_name(cache)); in mg_update_metadata()
1327 metadata_operation_failed(cache, "dm_cache_remove_mapping", r); in mg_update_metadata()
1338 * - vblock x in a cache block in mg_update_metadata()
1340 * - cache block gets reallocated and over written in mg_update_metadata()
1343 * When we recover, because there was no commit the cache will in mg_update_metadata()
1344 * rollback to having the data for vblock x in the cache block. in mg_update_metadata()
1345 * But the cache block has since been overwritten, so it'll end in mg_update_metadata()
1353 continue_after_commit(&cache->committer, &mg->k); in mg_update_metadata()
1354 schedule_commit(&cache->committer); in mg_update_metadata()
1391 r = dm_cell_lock_promote_v2(mg->cache->prison, mg->cell, in mg_upgrade_lock()
1407 struct cache *cache = mg->cache; in mg_full_copy() local
1411 if ((!is_policy_promote && !is_dirty(cache, op->cblock)) || in mg_full_copy()
1412 is_discarded_oblock(cache, op->oblock)) { in mg_full_copy()
1431 if (!optimisable_bio(mg->cache, mg->overwrite_bio, mg->op->oblock)) { in mg_copy()
1435 bool rb = bio_detain_shared(mg->cache, mg->op->oblock, mg->overwrite_bio); in mg_copy()
1438 inc_io_migrations(mg->cache); in mg_copy()
1460 struct cache *cache = mg->cache; in mg_lock_writes() local
1463 prealloc = alloc_prison_cell(cache); in mg_lock_writes()
1471 r = dm_cell_lock_v2(cache->prison, &key, in mg_lock_writes()
1475 free_prison_cell(cache, prealloc); in mg_lock_writes()
1481 free_prison_cell(cache, prealloc); in mg_lock_writes()
1491 static int mg_start(struct cache *cache, struct policy_work *op, struct bio *bio) in mg_start() argument
1495 if (!background_work_begin(cache)) { in mg_start()
1496 policy_complete_background_work(cache->policy, op, false); in mg_start()
1500 mg = alloc_migration(cache); in mg_start()
1506 inc_io_migrations(cache); in mg_start()
1518 struct cache *cache = mg->cache; in invalidate_complete() local
1521 if (dm_cell_unlock_v2(cache->prison, mg->cell, &bios)) in invalidate_complete()
1522 free_prison_cell(cache, mg->cell); in invalidate_complete()
1528 defer_bios(cache, &bios); in invalidate_complete()
1530 background_work_end(cache); in invalidate_complete()
1539 static int invalidate_cblock(struct cache *cache, dm_cblock_t cblock) in invalidate_cblock() argument
1541 int r = policy_invalidate_mapping(cache->policy, cblock); in invalidate_cblock()
1543 r = dm_cache_remove_mapping(cache->cmd, cblock); in invalidate_cblock()
1546 cache_device_name(cache)); in invalidate_cblock()
1547 metadata_operation_failed(cache, "dm_cache_remove_mapping", r); in invalidate_cblock()
1557 DMERR("%s: policy_invalidate_mapping failed", cache_device_name(cache)); in invalidate_cblock()
1566 struct cache *cache = mg->cache; in invalidate_remove() local
1568 r = invalidate_cblock(cache, mg->invalidate_cblock); in invalidate_remove()
1575 continue_after_commit(&cache->committer, &mg->k); in invalidate_remove()
1576 remap_to_origin_clear_discard(cache, mg->overwrite_bio, mg->invalidate_oblock); in invalidate_remove()
1578 schedule_commit(&cache->committer); in invalidate_remove()
1585 struct cache *cache = mg->cache; in invalidate_lock() local
1588 prealloc = alloc_prison_cell(cache); in invalidate_lock()
1591 r = dm_cell_lock_v2(cache->prison, &key, in invalidate_lock()
1594 free_prison_cell(cache, prealloc); in invalidate_lock()
1600 free_prison_cell(cache, prealloc); in invalidate_lock()
1611 queue_work(cache->wq, &mg->k.ws); in invalidate_lock()
1617 static int invalidate_start(struct cache *cache, dm_cblock_t cblock, in invalidate_start() argument
1622 if (!background_work_begin(cache)) in invalidate_start()
1625 mg = alloc_migration(cache); in invalidate_start()
1643 static enum busy spare_migration_bandwidth(struct cache *cache) in spare_migration_bandwidth() argument
1645 bool idle = iot_idle_for(&cache->tracker, HZ); in spare_migration_bandwidth()
1646 sector_t current_volume = (atomic_read(&cache->nr_io_migrations) + 1) * in spare_migration_bandwidth()
1647 cache->sectors_per_block; in spare_migration_bandwidth()
1649 if (idle && current_volume <= cache->migration_threshold) in spare_migration_bandwidth()
1655 static void inc_hit_counter(struct cache *cache, struct bio *bio) in inc_hit_counter() argument
1658 &cache->stats.read_hit : &cache->stats.write_hit); in inc_hit_counter()
1661 static void inc_miss_counter(struct cache *cache, struct bio *bio) in inc_miss_counter() argument
1664 &cache->stats.read_miss : &cache->stats.write_miss); in inc_miss_counter()
1669 static int map_bio(struct cache *cache, struct bio *bio, dm_oblock_t block, in map_bio() argument
1678 rb = bio_detain_shared(cache, block, bio); in map_bio()
1692 if (optimisable_bio(cache, bio, block)) { in map_bio()
1695 r = policy_lookup_with_work(cache->policy, block, &cblock, data_dir, true, &op); in map_bio()
1698 cache_device_name(cache), r); in map_bio()
1704 bio_drop_shared_lock(cache, bio); in map_bio()
1706 mg_start(cache, op, bio); in map_bio()
1710 r = policy_lookup(cache->policy, block, &cblock, data_dir, false, &background_queued); in map_bio()
1713 cache_device_name(cache), r); in map_bio()
1719 wake_migration_worker(cache); in map_bio()
1728 inc_miss_counter(cache, bio); in map_bio()
1730 accounted_begin(cache, bio); in map_bio()
1731 remap_to_origin_clear_discard(cache, bio, block); in map_bio()
1744 inc_hit_counter(cache, bio); in map_bio()
1748 * cache blocks that are written to. in map_bio()
1750 if (passthrough_mode(cache)) { in map_bio()
1752 bio_drop_shared_lock(cache, bio); in map_bio()
1753 atomic_inc(&cache->stats.demotion); in map_bio()
1754 invalidate_start(cache, cblock, block, bio); in map_bio()
1756 remap_to_origin_clear_discard(cache, bio, block); in map_bio()
1758 if (bio_data_dir(bio) == WRITE && writethrough_mode(cache) && in map_bio()
1759 !is_dirty(cache, cblock)) { in map_bio()
1760 remap_to_origin_and_cache(cache, bio, block, cblock); in map_bio()
1761 accounted_begin(cache, bio); in map_bio()
1763 remap_to_cache_dirty(cache, bio, block, cblock); in map_bio()
1775 accounted_complete(cache, bio); in map_bio()
1776 issue_after_commit(&cache->committer, bio); in map_bio()
1784 static bool process_bio(struct cache *cache, struct bio *bio) in process_bio() argument
1788 if (map_bio(cache, bio, get_bio_block(cache, bio), &commit_needed) == DM_MAPIO_REMAPPED) in process_bio()
1797 static int commit(struct cache *cache, bool clean_shutdown) in commit() argument
1801 if (get_cache_mode(cache) >= CM_READ_ONLY) in commit()
1804 atomic_inc(&cache->stats.commit_count); in commit()
1805 r = dm_cache_commit(cache->cmd, clean_shutdown); in commit()
1807 metadata_operation_failed(cache, "dm_cache_commit", r); in commit()
1817 struct cache *cache = context; in commit_op() local
1819 if (dm_cache_changed_this_transaction(cache->cmd)) in commit_op()
1820 return errno_to_blk_status(commit(cache, false)); in commit_op()
1827 static bool process_flush_bio(struct cache *cache, struct bio *bio) in process_flush_bio() argument
1832 remap_to_origin(cache, bio); in process_flush_bio()
1834 remap_to_cache(cache, bio, 0); in process_flush_bio()
1836 issue_after_commit(&cache->committer, bio); in process_flush_bio()
1840 static bool process_discard_bio(struct cache *cache, struct bio *bio) in process_discard_bio() argument
1847 calc_discard_block_range(cache, bio, &b, &e); in process_discard_bio()
1849 set_discard(cache, b); in process_discard_bio()
1853 if (cache->features.discard_passdown) { in process_discard_bio()
1854 remap_to_origin(cache, bio); in process_discard_bio()
1864 struct cache *cache = container_of(ws, struct cache, deferred_bio_worker); in process_deferred_bios() local
1872 spin_lock_irq(&cache->lock); in process_deferred_bios()
1873 bio_list_merge(&bios, &cache->deferred_bios); in process_deferred_bios()
1874 bio_list_init(&cache->deferred_bios); in process_deferred_bios()
1875 spin_unlock_irq(&cache->lock); in process_deferred_bios()
1879 commit_needed = process_flush_bio(cache, bio) || commit_needed; in process_deferred_bios()
1882 commit_needed = process_discard_bio(cache, bio) || commit_needed; in process_deferred_bios()
1885 commit_needed = process_bio(cache, bio) || commit_needed; in process_deferred_bios()
1889 schedule_commit(&cache->committer); in process_deferred_bios()
1896 static void requeue_deferred_bios(struct cache *cache) in requeue_deferred_bios() argument
1902 bio_list_merge(&bios, &cache->deferred_bios); in requeue_deferred_bios()
1903 bio_list_init(&cache->deferred_bios); in requeue_deferred_bios()
1917 struct cache *cache = container_of(to_delayed_work(ws), struct cache, waker); in do_waker() local
1919 policy_tick(cache->policy, true); in do_waker()
1920 wake_migration_worker(cache); in do_waker()
1921 schedule_commit(&cache->committer); in do_waker()
1922 queue_delayed_work(cache->wq, &cache->waker, COMMIT_PERIOD); in do_waker()
1929 struct cache *cache = container_of(ws, struct cache, migration_worker); in check_migrations() local
1933 b = spare_migration_bandwidth(cache); in check_migrations()
1935 r = policy_get_background_work(cache->policy, b == IDLE, &op); in check_migrations()
1941 cache_device_name(cache)); in check_migrations()
1945 r = mg_start(cache, op, NULL); in check_migrations()
1959 static void destroy(struct cache *cache) in destroy() argument
1963 mempool_exit(&cache->migration_pool); in destroy()
1965 if (cache->prison) in destroy()
1966 dm_bio_prison_destroy_v2(cache->prison); in destroy()
1968 if (cache->wq) in destroy()
1969 destroy_workqueue(cache->wq); in destroy()
1971 if (cache->dirty_bitset) in destroy()
1972 free_bitset(cache->dirty_bitset); in destroy()
1974 if (cache->discard_bitset) in destroy()
1975 free_bitset(cache->discard_bitset); in destroy()
1977 if (cache->copier) in destroy()
1978 dm_kcopyd_client_destroy(cache->copier); in destroy()
1980 if (cache->cmd) in destroy()
1981 dm_cache_metadata_close(cache->cmd); in destroy()
1983 if (cache->metadata_dev) in destroy()
1984 dm_put_device(cache->ti, cache->metadata_dev); in destroy()
1986 if (cache->origin_dev) in destroy()
1987 dm_put_device(cache->ti, cache->origin_dev); in destroy()
1989 if (cache->cache_dev) in destroy()
1990 dm_put_device(cache->ti, cache->cache_dev); in destroy()
1992 if (cache->policy) in destroy()
1993 dm_cache_policy_destroy(cache->policy); in destroy()
1995 for (i = 0; i < cache->nr_ctr_args ; i++) in destroy()
1996 kfree(cache->ctr_args[i]); in destroy()
1997 kfree(cache->ctr_args); in destroy()
1999 bioset_exit(&cache->bs); in destroy()
2001 kfree(cache); in destroy()
2006 struct cache *cache = ti->private; in cache_dtr() local
2008 destroy(cache); in cache_dtr()
2019 * Construct a cache device mapping.
2021 * cache <metadata dev> <cache dev> <origin dev> <block size>
2026 * cache dev : fast device holding cached data blocks
2028 * block size : cache unit size in sectors
2038 * See cache-policies.txt for details.
2041 * writethrough : write through caching that prohibits cache block
2044 * back cache block contents later for performance reasons,
2127 *error = "Error opening cache device"; in parse_cache_dev()
2176 *error = "Data block size is larger than the cache device"; in parse_block_size()
2197 {0, 3, "Invalid number of cache feature arguments"}, in parse_features()
2236 *error = "Unrecognised cache feature requested"; in parse_features()
2242 *error = "Duplicate cache io_mode features requested"; in parse_features()
2315 static int process_config_option(struct cache *cache, const char *key, const char *value) in process_config_option() argument
2323 cache->migration_threshold = tmp; in process_config_option()
2330 static int set_config_value(struct cache *cache, const char *key, const char *value) in set_config_value() argument
2332 int r = process_config_option(cache, key, value); in set_config_value()
2335 r = policy_set_config_value(cache->policy, key, value); in set_config_value()
2343 static int set_config_values(struct cache *cache, int argc, const char **argv) in set_config_values() argument
2353 r = set_config_value(cache, argv[0], argv[1]); in set_config_values()
2364 static int create_cache_policy(struct cache *cache, struct cache_args *ca, in create_cache_policy() argument
2368 cache->cache_size, in create_cache_policy()
2369 cache->origin_sectors, in create_cache_policy()
2370 cache->sectors_per_block); in create_cache_policy()
2372 *error = "Error creating cache's policy"; in create_cache_policy()
2375 cache->policy = p; in create_cache_policy()
2376 BUG_ON(!cache->policy); in create_cache_policy()
2382 * We want the discard block size to be at least the size of the cache
2407 static void set_cache_size(struct cache *cache, dm_cblock_t size) in set_cache_size() argument
2411 if (nr_blocks > (1 << 20) && cache->cache_size != size) in set_cache_size()
2412 DMWARN_LIMIT("You have created a cache device with a lot of individual cache blocks (%llu)\n" in set_cache_size()
2414 "Please consider increasing the cache block size to reduce the overall cache block count.", in set_cache_size()
2417 cache->cache_size = size; in set_cache_size()
2422 static int cache_create(struct cache_args *ca, struct cache **result) in cache_create()
2426 struct cache *cache; in cache_create() local
2432 cache = kzalloc(sizeof(*cache), GFP_KERNEL); in cache_create()
2433 if (!cache) in cache_create()
2436 cache->ti = ca->ti; in cache_create()
2437 ti->private = cache; in cache_create()
2446 cache->features = ca->features; in cache_create()
2447 if (writethrough_mode(cache)) { in cache_create()
2449 r = bioset_init(&cache->bs, BIO_POOL_SIZE, 0, 0); in cache_create()
2454 cache->metadata_dev = ca->metadata_dev; in cache_create()
2455 cache->origin_dev = ca->origin_dev; in cache_create()
2456 cache->cache_dev = ca->cache_dev; in cache_create()
2460 origin_blocks = cache->origin_sectors = ca->origin_sectors; in cache_create()
2462 cache->origin_blocks = to_oblock(origin_blocks); in cache_create()
2464 cache->sectors_per_block = ca->block_size; in cache_create()
2465 if (dm_set_target_max_io_len(ti, cache->sectors_per_block)) { in cache_create()
2473 cache->sectors_per_block_shift = -1; in cache_create()
2475 set_cache_size(cache, to_cblock(cache_size)); in cache_create()
2477 cache->sectors_per_block_shift = __ffs(ca->block_size); in cache_create()
2478 set_cache_size(cache, to_cblock(ca->cache_sectors >> cache->sectors_per_block_shift)); in cache_create()
2481 r = create_cache_policy(cache, ca, error); in cache_create()
2485 cache->policy_nr_args = ca->policy_argc; in cache_create()
2486 cache->migration_threshold = DEFAULT_MIGRATION_THRESHOLD; in cache_create()
2488 r = set_config_values(cache, ca->policy_argc, ca->policy_argv); in cache_create()
2490 *error = "Error setting cache policy's config values"; in cache_create()
2494 cmd = dm_cache_metadata_open(cache->metadata_dev->bdev, in cache_create()
2496 dm_cache_policy_get_hint_size(cache->policy), in cache_create()
2503 cache->cmd = cmd; in cache_create()
2504 set_cache_mode(cache, CM_WRITE); in cache_create()
2505 if (get_cache_mode(cache) != CM_WRITE) { in cache_create()
2511 if (passthrough_mode(cache)) { in cache_create()
2514 r = dm_cache_metadata_all_clean(cache->cmd, &all_clean); in cache_create()
2526 policy_allow_migrations(cache->policy, false); in cache_create()
2529 spin_lock_init(&cache->lock); in cache_create()
2530 bio_list_init(&cache->deferred_bios); in cache_create()
2531 atomic_set(&cache->nr_allocated_migrations, 0); in cache_create()
2532 atomic_set(&cache->nr_io_migrations, 0); in cache_create()
2533 init_waitqueue_head(&cache->migration_wait); in cache_create()
2536 atomic_set(&cache->nr_dirty, 0); in cache_create()
2537 cache->dirty_bitset = alloc_bitset(from_cblock(cache->cache_size)); in cache_create()
2538 if (!cache->dirty_bitset) { in cache_create()
2542 clear_bitset(cache->dirty_bitset, from_cblock(cache->cache_size)); in cache_create()
2544 cache->discard_block_size = in cache_create()
2545 calculate_discard_block_size(cache->sectors_per_block, in cache_create()
2546 cache->origin_sectors); in cache_create()
2547 cache->discard_nr_blocks = to_dblock(dm_sector_div_up(cache->origin_sectors, in cache_create()
2548 cache->discard_block_size)); in cache_create()
2549 cache->discard_bitset = alloc_bitset(from_dblock(cache->discard_nr_blocks)); in cache_create()
2550 if (!cache->discard_bitset) { in cache_create()
2554 clear_bitset(cache->discard_bitset, from_dblock(cache->discard_nr_blocks)); in cache_create()
2556 cache->copier = dm_kcopyd_client_create(&dm_kcopyd_throttle); in cache_create()
2557 if (IS_ERR(cache->copier)) { in cache_create()
2559 r = PTR_ERR(cache->copier); in cache_create()
2563 cache->wq = alloc_workqueue("dm-" DM_MSG_PREFIX, WQ_MEM_RECLAIM, 0); in cache_create()
2564 if (!cache->wq) { in cache_create()
2568 INIT_WORK(&cache->deferred_bio_worker, process_deferred_bios); in cache_create()
2569 INIT_WORK(&cache->migration_worker, check_migrations); in cache_create()
2570 INIT_DELAYED_WORK(&cache->waker, do_waker); in cache_create()
2572 cache->prison = dm_bio_prison_create_v2(cache->wq); in cache_create()
2573 if (!cache->prison) { in cache_create()
2578 r = mempool_init_slab_pool(&cache->migration_pool, MIGRATION_POOL_SIZE, in cache_create()
2581 *error = "Error creating cache's migration mempool"; in cache_create()
2585 cache->need_tick_bio = true; in cache_create()
2586 cache->sized = false; in cache_create()
2587 cache->invalidate = false; in cache_create()
2588 cache->commit_requested = false; in cache_create()
2589 cache->loaded_mappings = false; in cache_create()
2590 cache->loaded_discards = false; in cache_create()
2592 load_stats(cache); in cache_create()
2594 atomic_set(&cache->stats.demotion, 0); in cache_create()
2595 atomic_set(&cache->stats.promotion, 0); in cache_create()
2596 atomic_set(&cache->stats.copies_avoided, 0); in cache_create()
2597 atomic_set(&cache->stats.cache_cell_clash, 0); in cache_create()
2598 atomic_set(&cache->stats.commit_count, 0); in cache_create()
2599 atomic_set(&cache->stats.discard_count, 0); in cache_create()
2601 spin_lock_init(&cache->invalidation_lock); in cache_create()
2602 INIT_LIST_HEAD(&cache->invalidation_requests); in cache_create()
2604 batcher_init(&cache->committer, commit_op, cache, in cache_create()
2605 issue_op, cache, cache->wq); in cache_create()
2606 iot_init(&cache->tracker); in cache_create()
2608 init_rwsem(&cache->background_work_lock); in cache_create()
2609 prevent_background_work(cache); in cache_create()
2611 *result = cache; in cache_create()
2614 destroy(cache); in cache_create()
2618 static int copy_ctr_args(struct cache *cache, int argc, const char **argv) in copy_ctr_args() argument
2636 cache->nr_ctr_args = argc; in copy_ctr_args()
2637 cache->ctr_args = copy; in copy_ctr_args()
2646 struct cache *cache = NULL; in cache_ctr() local
2650 ti->error = "Error allocating memory for cache"; in cache_ctr()
2659 r = cache_create(ca, &cache); in cache_ctr()
2663 r = copy_ctr_args(cache, argc - 3, (const char **)argv + 3); in cache_ctr()
2665 destroy(cache); in cache_ctr()
2669 ti->private = cache; in cache_ctr()
2679 struct cache *cache = ti->private; in cache_map() local
2683 dm_oblock_t block = get_bio_block(cache, bio); in cache_map()
2686 if (unlikely(from_oblock(block) >= from_oblock(cache->origin_blocks))) { in cache_map()
2689 * the end of the origin device. We don't cache these. in cache_map()
2692 remap_to_origin(cache, bio); in cache_map()
2693 accounted_begin(cache, bio); in cache_map()
2698 defer_bio(cache, bio); in cache_map()
2702 r = map_bio(cache, bio, block, &commit_needed); in cache_map()
2704 schedule_commit(&cache->committer); in cache_map()
2711 struct cache *cache = ti->private; in cache_end_io() local
2716 policy_tick(cache->policy, false); in cache_end_io()
2718 spin_lock_irqsave(&cache->lock, flags); in cache_end_io()
2719 cache->need_tick_bio = true; in cache_end_io()
2720 spin_unlock_irqrestore(&cache->lock, flags); in cache_end_io()
2723 bio_drop_shared_lock(cache, bio); in cache_end_io()
2724 accounted_complete(cache, bio); in cache_end_io()
2729 static int write_dirty_bitset(struct cache *cache) in write_dirty_bitset() argument
2733 if (get_cache_mode(cache) >= CM_READ_ONLY) in write_dirty_bitset()
2736 r = dm_cache_set_dirty_bits(cache->cmd, from_cblock(cache->cache_size), cache->dirty_bitset); in write_dirty_bitset()
2738 metadata_operation_failed(cache, "dm_cache_set_dirty_bits", r); in write_dirty_bitset()
2743 static int write_discard_bitset(struct cache *cache) in write_discard_bitset() argument
2747 if (get_cache_mode(cache) >= CM_READ_ONLY) in write_discard_bitset()
2750 r = dm_cache_discard_bitset_resize(cache->cmd, cache->discard_block_size, in write_discard_bitset()
2751 cache->discard_nr_blocks); in write_discard_bitset()
2753 DMERR("%s: could not resize on-disk discard bitset", cache_device_name(cache)); in write_discard_bitset()
2754 metadata_operation_failed(cache, "dm_cache_discard_bitset_resize", r); in write_discard_bitset()
2758 for (i = 0; i < from_dblock(cache->discard_nr_blocks); i++) { in write_discard_bitset()
2759 r = dm_cache_set_discard(cache->cmd, to_dblock(i), in write_discard_bitset()
2760 is_discarded(cache, to_dblock(i))); in write_discard_bitset()
2762 metadata_operation_failed(cache, "dm_cache_set_discard", r); in write_discard_bitset()
2770 static int write_hints(struct cache *cache) in write_hints() argument
2774 if (get_cache_mode(cache) >= CM_READ_ONLY) in write_hints()
2777 r = dm_cache_write_hints(cache->cmd, cache->policy); in write_hints()
2779 metadata_operation_failed(cache, "dm_cache_write_hints", r); in write_hints()
2789 static bool sync_metadata(struct cache *cache) in sync_metadata() argument
2793 r1 = write_dirty_bitset(cache); in sync_metadata()
2795 DMERR("%s: could not write dirty bitset", cache_device_name(cache)); in sync_metadata()
2797 r2 = write_discard_bitset(cache); in sync_metadata()
2799 DMERR("%s: could not write discard bitset", cache_device_name(cache)); in sync_metadata()
2801 save_stats(cache); in sync_metadata()
2803 r3 = write_hints(cache); in sync_metadata()
2805 DMERR("%s: could not write hints", cache_device_name(cache)); in sync_metadata()
2812 r4 = commit(cache, !r1 && !r2 && !r3); in sync_metadata()
2814 DMERR("%s: could not write cache metadata", cache_device_name(cache)); in sync_metadata()
2821 struct cache *cache = ti->private; in cache_postsuspend() local
2823 prevent_background_work(cache); in cache_postsuspend()
2824 BUG_ON(atomic_read(&cache->nr_io_migrations)); in cache_postsuspend()
2826 cancel_delayed_work_sync(&cache->waker); in cache_postsuspend()
2827 drain_workqueue(cache->wq); in cache_postsuspend()
2828 WARN_ON(cache->tracker.in_flight); in cache_postsuspend()
2834 requeue_deferred_bios(cache); in cache_postsuspend()
2836 if (get_cache_mode(cache) == CM_WRITE) in cache_postsuspend()
2837 (void) sync_metadata(cache); in cache_postsuspend()
2844 struct cache *cache = context; in load_mapping() local
2847 set_bit(from_cblock(cblock), cache->dirty_bitset); in load_mapping()
2848 atomic_inc(&cache->nr_dirty); in load_mapping()
2850 clear_bit(from_cblock(cblock), cache->dirty_bitset); in load_mapping()
2852 r = policy_load_mapping(cache->policy, oblock, cblock, dirty, hint, hint_valid); in load_mapping()
2866 struct cache *cache; member
2876 static void discard_load_info_init(struct cache *cache, in discard_load_info_init() argument
2879 li->cache = cache; in discard_load_info_init()
2899 b = dm_sector_div_up(b, li->cache->discard_block_size); in set_discard_range()
2900 sector_div(e, li->cache->discard_block_size); in set_discard_range()
2906 if (e > from_dblock(li->cache->discard_nr_blocks)) in set_discard_range()
2907 e = from_dblock(li->cache->discard_nr_blocks); in set_discard_range()
2910 set_discard(li->cache, to_dblock(b)); in set_discard_range()
2943 static dm_cblock_t get_cache_dev_size(struct cache *cache) in get_cache_dev_size() argument
2945 sector_t size = get_dev_size(cache->cache_dev); in get_cache_dev_size()
2946 (void) sector_div(size, cache->sectors_per_block); in get_cache_dev_size()
2950 static bool can_resize(struct cache *cache, dm_cblock_t new_size) in can_resize() argument
2952 if (from_cblock(new_size) > from_cblock(cache->cache_size)) { in can_resize()
2953 if (cache->sized) { in can_resize()
2954 DMERR("%s: unable to extend cache due to missing cache table reload", in can_resize()
2955 cache_device_name(cache)); in can_resize()
2961 * We can't drop a dirty block when shrinking the cache. in can_resize()
2963 while (from_cblock(new_size) < from_cblock(cache->cache_size)) { in can_resize()
2965 if (is_dirty(cache, new_size)) { in can_resize()
2966 DMERR("%s: unable to shrink cache; cache block %llu is dirty", in can_resize()
2967 cache_device_name(cache), in can_resize()
2976 static int resize_cache_dev(struct cache *cache, dm_cblock_t new_size) in resize_cache_dev() argument
2980 r = dm_cache_resize(cache->cmd, new_size); in resize_cache_dev()
2982 DMERR("%s: could not resize cache metadata", cache_device_name(cache)); in resize_cache_dev()
2983 metadata_operation_failed(cache, "dm_cache_resize", r); in resize_cache_dev()
2987 set_cache_size(cache, new_size); in resize_cache_dev()
2995 struct cache *cache = ti->private; in cache_preresume() local
2996 dm_cblock_t csize = get_cache_dev_size(cache); in cache_preresume()
2999 * Check to see if the cache has resized. in cache_preresume()
3001 if (!cache->sized) { in cache_preresume()
3002 r = resize_cache_dev(cache, csize); in cache_preresume()
3006 cache->sized = true; in cache_preresume()
3008 } else if (csize != cache->cache_size) { in cache_preresume()
3009 if (!can_resize(cache, csize)) in cache_preresume()
3012 r = resize_cache_dev(cache, csize); in cache_preresume()
3017 if (!cache->loaded_mappings) { in cache_preresume()
3018 r = dm_cache_load_mappings(cache->cmd, cache->policy, in cache_preresume()
3019 load_mapping, cache); in cache_preresume()
3021 DMERR("%s: could not load cache mappings", cache_device_name(cache)); in cache_preresume()
3022 metadata_operation_failed(cache, "dm_cache_load_mappings", r); in cache_preresume()
3026 cache->loaded_mappings = true; in cache_preresume()
3029 if (!cache->loaded_discards) { in cache_preresume()
3037 clear_bitset(cache->discard_bitset, from_dblock(cache->discard_nr_blocks)); in cache_preresume()
3039 discard_load_info_init(cache, &li); in cache_preresume()
3040 r = dm_cache_load_discards(cache->cmd, load_discard, &li); in cache_preresume()
3042 DMERR("%s: could not load origin discards", cache_device_name(cache)); in cache_preresume()
3043 metadata_operation_failed(cache, "dm_cache_load_discards", r); in cache_preresume()
3048 cache->loaded_discards = true; in cache_preresume()
3056 struct cache *cache = ti->private; in cache_resume() local
3058 cache->need_tick_bio = true; in cache_resume()
3059 allow_background_work(cache); in cache_resume()
3060 do_waker(&cache->waker.work); in cache_resume()
3063 static void emit_flags(struct cache *cache, char *result, in emit_flags() argument
3067 struct cache_features *cf = &cache->features; in emit_flags()
3075 if (writethrough_mode(cache)) in emit_flags()
3078 else if (passthrough_mode(cache)) in emit_flags()
3081 else if (writeback_mode(cache)) in emit_flags()
3087 cache_device_name(cache), (int) cf->io_mode); in emit_flags()
3100 * <cache block size> <#used cache blocks>/<#total cache blocks>
3105 * <policy name> <#policy args> <policy args>* <cache metadata mode> <needs_check>
3116 struct cache *cache = ti->private; in cache_status() local
3122 if (get_cache_mode(cache) == CM_FAIL) { in cache_status()
3129 (void) commit(cache, false); in cache_status()
3131 r = dm_cache_get_free_metadata_block_count(cache->cmd, &nr_free_blocks_metadata); in cache_status()
3134 cache_device_name(cache), r); in cache_status()
3138 r = dm_cache_get_metadata_dev_size(cache->cmd, &nr_blocks_metadata); in cache_status()
3141 cache_device_name(cache), r); in cache_status()
3145 residency = policy_residency(cache->policy); in cache_status()
3151 (unsigned long long)cache->sectors_per_block, in cache_status()
3153 (unsigned long long) from_cblock(cache->cache_size), in cache_status()
3154 (unsigned) atomic_read(&cache->stats.read_hit), in cache_status()
3155 (unsigned) atomic_read(&cache->stats.read_miss), in cache_status()
3156 (unsigned) atomic_read(&cache->stats.write_hit), in cache_status()
3157 (unsigned) atomic_read(&cache->stats.write_miss), in cache_status()
3158 (unsigned) atomic_read(&cache->stats.demotion), in cache_status()
3159 (unsigned) atomic_read(&cache->stats.promotion), in cache_status()
3160 (unsigned long) atomic_read(&cache->nr_dirty)); in cache_status()
3162 emit_flags(cache, result, maxlen, &sz); in cache_status()
3164 DMEMIT("2 migration_threshold %llu ", (unsigned long long) cache->migration_threshold); in cache_status()
3166 DMEMIT("%s ", dm_cache_policy_get_name(cache->policy)); in cache_status()
3168 r = policy_emit_config_values(cache->policy, result, maxlen, &sz); in cache_status()
3171 cache_device_name(cache), r); in cache_status()
3174 if (get_cache_mode(cache) == CM_READ_ONLY) in cache_status()
3179 r = dm_cache_metadata_needs_check(cache->cmd, &needs_check); in cache_status()
3189 format_dev_t(buf, cache->metadata_dev->bdev->bd_dev); in cache_status()
3191 format_dev_t(buf, cache->cache_dev->bdev->bd_dev); in cache_status()
3193 format_dev_t(buf, cache->origin_dev->bdev->bd_dev); in cache_status()
3196 for (i = 0; i < cache->nr_ctr_args - 1; i++) in cache_status()
3197 DMEMIT(" %s", cache->ctr_args[i]); in cache_status()
3198 if (cache->nr_ctr_args) in cache_status()
3199 DMEMIT(" %s", cache->ctr_args[cache->nr_ctr_args - 1]); in cache_status()
3218 * A cache block range can take two forms:
3223 static int parse_cblock_range(struct cache *cache, const char *str, in parse_cblock_range() argument
3256 DMERR("%s: invalid cblock range '%s'", cache_device_name(cache), str); in parse_cblock_range()
3260 static int validate_cblock_range(struct cache *cache, struct cblock_range *range) in validate_cblock_range() argument
3264 uint64_t n = from_cblock(cache->cache_size); in validate_cblock_range()
3268 cache_device_name(cache), b, n); in validate_cblock_range()
3274 cache_device_name(cache), e, n); in validate_cblock_range()
3280 cache_device_name(cache), b, e); in validate_cblock_range()
3292 static int request_invalidation(struct cache *cache, struct cblock_range *range) in request_invalidation() argument
3303 r = invalidate_cblock(cache, range->begin); in request_invalidation()
3310 cache->commit_requested = true; in request_invalidation()
3314 static int process_invalidate_cblocks_message(struct cache *cache, unsigned count, in process_invalidate_cblocks_message() argument
3321 if (!passthrough_mode(cache)) { in process_invalidate_cblocks_message()
3322 DMERR("%s: cache has to be in passthrough mode for invalidation", in process_invalidate_cblocks_message()
3323 cache_device_name(cache)); in process_invalidate_cblocks_message()
3328 r = parse_cblock_range(cache, cblock_ranges[i], &range); in process_invalidate_cblocks_message()
3332 r = validate_cblock_range(cache, &range); in process_invalidate_cblocks_message()
3339 r = request_invalidation(cache, &range); in process_invalidate_cblocks_message()
3353 * The key migration_threshold is supported by the cache target core.
3358 struct cache *cache = ti->private; in cache_message() local
3363 if (get_cache_mode(cache) >= CM_READ_ONLY) { in cache_message()
3364 DMERR("%s: unable to service cache target messages in READ_ONLY or FAIL mode", in cache_message()
3365 cache_device_name(cache)); in cache_message()
3370 return process_invalidate_cblocks_message(cache, argc - 1, (const char **) argv + 1); in cache_message()
3375 return set_config_value(cache, argv[0], argv[1]); in cache_message()
3382 struct cache *cache = ti->private; in cache_iterate_devices() local
3384 r = fn(ti, cache->cache_dev, 0, get_dev_size(cache->cache_dev), data); in cache_iterate_devices()
3386 r = fn(ti, cache->origin_dev, 0, ti->len, data); in cache_iterate_devices()
3402 static void disable_passdown_if_not_supported(struct cache *cache) in disable_passdown_if_not_supported() argument
3404 struct block_device *origin_bdev = cache->origin_dev->bdev; in disable_passdown_if_not_supported()
3409 if (!cache->features.discard_passdown) in disable_passdown_if_not_supported()
3415 else if (origin_limits->max_discard_sectors < cache->sectors_per_block) in disable_passdown_if_not_supported()
3421 cache->features.discard_passdown = false; in disable_passdown_if_not_supported()
3425 static void set_discard_limits(struct cache *cache, struct queue_limits *limits) in set_discard_limits() argument
3427 struct block_device *origin_bdev = cache->origin_dev->bdev; in set_discard_limits()
3430 if (!cache->features.discard_passdown) { in set_discard_limits()
3432 limits->max_discard_sectors = min_t(sector_t, cache->discard_block_size * 1024, in set_discard_limits()
3433 cache->origin_sectors); in set_discard_limits()
3434 limits->discard_granularity = cache->discard_block_size << SECTOR_SHIFT; in set_discard_limits()
3451 struct cache *cache = ti->private; in cache_io_hints() local
3456 * cache's blocksize (io_opt is a factor) do not override them. in cache_io_hints()
3458 if (io_opt_sectors < cache->sectors_per_block || in cache_io_hints()
3459 do_div(io_opt_sectors, cache->sectors_per_block)) { in cache_io_hints()
3460 blk_limits_io_min(limits, cache->sectors_per_block << SECTOR_SHIFT); in cache_io_hints()
3461 blk_limits_io_opt(limits, cache->sectors_per_block << SECTOR_SHIFT); in cache_io_hints()
3464 disable_passdown_if_not_supported(cache); in cache_io_hints()
3465 set_discard_limits(cache, limits); in cache_io_hints()
3471 .name = "cache",
3497 DMERR("cache target registration failed: %d", r); in dm_cache_init()
3514 MODULE_DESCRIPTION(DM_NAME " cache target");