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_origin_clear_discard(struct cache *cache, struct bio *bio, in remap_to_origin_clear_discard() argument
761 __remap_to_origin_clear_discard(cache, bio, oblock, true); in remap_to_origin_clear_discard()
764 static void remap_to_cache_dirty(struct cache *cache, struct bio *bio, in remap_to_cache_dirty() argument
767 check_if_tick_bio_needed(cache, bio); in remap_to_cache_dirty()
768 remap_to_cache(cache, bio, cblock); in remap_to_cache_dirty()
770 set_dirty(cache, cblock); in remap_to_cache_dirty()
771 clear_discard(cache, oblock_to_dblock(cache, oblock)); in remap_to_cache_dirty()
775 static dm_oblock_t get_bio_block(struct cache *cache, struct bio *bio) in get_bio_block() argument
779 if (!block_size_is_power_of_two(cache)) in get_bio_block()
780 (void) sector_div(block_nr, cache->sectors_per_block); in get_bio_block()
782 block_nr >>= cache->sectors_per_block_shift; in get_bio_block()
787 static bool accountable_bio(struct cache *cache, struct bio *bio) in accountable_bio() argument
792 static void accounted_begin(struct cache *cache, struct bio *bio) in accounted_begin() argument
796 if (accountable_bio(cache, bio)) { in accounted_begin()
799 dm_iot_io_begin(&cache->tracker, pb->len); in accounted_begin()
803 static void accounted_complete(struct cache *cache, struct bio *bio) in accounted_complete() argument
807 dm_iot_io_end(&cache->tracker, pb->len); in accounted_complete()
810 static void accounted_request(struct cache *cache, struct bio *bio) in accounted_request() argument
812 accounted_begin(cache, bio); in accounted_request()
818 struct cache *cache = context; in issue_op() local
819 accounted_request(cache, bio); in issue_op()
824 * to both the cache and origin devices. Clone the bio and send them in parallel.
826 static void remap_to_origin_and_cache(struct cache *cache, struct bio *bio, in remap_to_origin_and_cache() argument
829 struct bio *origin_bio = bio_clone_fast(bio, GFP_NOIO, &cache->bs); in remap_to_origin_and_cache()
838 __remap_to_origin_clear_discard(cache, origin_bio, oblock, false); in remap_to_origin_and_cache()
841 remap_to_cache(cache, bio, cblock); in remap_to_origin_and_cache()
847 static enum cache_metadata_mode get_cache_mode(struct cache *cache) in get_cache_mode() argument
849 return cache->features.mode; in get_cache_mode()
852 static const char *cache_device_name(struct cache *cache) in cache_device_name() argument
854 return dm_table_device_name(cache->ti->table); in cache_device_name()
857 static void notify_mode_switch(struct cache *cache, enum cache_metadata_mode mode) in notify_mode_switch() argument
865 dm_table_event(cache->ti->table); in notify_mode_switch()
866 DMINFO("%s: switching cache to %s mode", in notify_mode_switch()
867 cache_device_name(cache), descs[(int)mode]); in notify_mode_switch()
870 static void set_cache_mode(struct cache *cache, enum cache_metadata_mode new_mode) in set_cache_mode() argument
873 enum cache_metadata_mode old_mode = get_cache_mode(cache); in set_cache_mode()
875 if (dm_cache_metadata_needs_check(cache->cmd, &needs_check)) { in set_cache_mode()
877 cache_device_name(cache)); in set_cache_mode()
882 DMERR("%s: unable to switch cache to write mode until repaired.", in set_cache_mode()
883 cache_device_name(cache)); in set_cache_mode()
897 dm_cache_metadata_set_read_only(cache->cmd); in set_cache_mode()
901 dm_cache_metadata_set_read_write(cache->cmd); in set_cache_mode()
905 cache->features.mode = new_mode; in set_cache_mode()
908 notify_mode_switch(cache, new_mode); in set_cache_mode()
911 static void abort_transaction(struct cache *cache) in abort_transaction() argument
913 const char *dev_name = cache_device_name(cache); in abort_transaction()
915 if (get_cache_mode(cache) >= CM_READ_ONLY) in abort_transaction()
918 if (dm_cache_metadata_set_needs_check(cache->cmd)) { in abort_transaction()
920 set_cache_mode(cache, CM_FAIL); in abort_transaction()
924 if (dm_cache_metadata_abort(cache->cmd)) { in abort_transaction()
926 set_cache_mode(cache, CM_FAIL); in abort_transaction()
930 static void metadata_operation_failed(struct cache *cache, const char *op, int r) in metadata_operation_failed() argument
933 cache_device_name(cache), op, r); in metadata_operation_failed()
934 abort_transaction(cache); in metadata_operation_failed()
935 set_cache_mode(cache, CM_READ_ONLY); in metadata_operation_failed()
940 static void load_stats(struct cache *cache) in load_stats() argument
944 dm_cache_metadata_get_stats(cache->cmd, &stats); in load_stats()
945 atomic_set(&cache->stats.read_hit, stats.read_hits); in load_stats()
946 atomic_set(&cache->stats.read_miss, stats.read_misses); in load_stats()
947 atomic_set(&cache->stats.write_hit, stats.write_hits); in load_stats()
948 atomic_set(&cache->stats.write_miss, stats.write_misses); in load_stats()
951 static void save_stats(struct cache *cache) in save_stats() argument
955 if (get_cache_mode(cache) >= CM_READ_ONLY) in save_stats()
958 stats.read_hits = atomic_read(&cache->stats.read_hit); in save_stats()
959 stats.read_misses = atomic_read(&cache->stats.read_miss); in save_stats()
960 stats.write_hits = atomic_read(&cache->stats.write_hit); in save_stats()
961 stats.write_misses = atomic_read(&cache->stats.write_miss); in save_stats()
963 dm_cache_metadata_set_stats(cache->cmd, &stats); in save_stats()
986 * Migration covers moving data from the origin device to the cache, or
990 static void inc_io_migrations(struct cache *cache) in inc_io_migrations() argument
992 atomic_inc(&cache->nr_io_migrations); in inc_io_migrations()
995 static void dec_io_migrations(struct cache *cache) in dec_io_migrations() argument
997 atomic_dec(&cache->nr_io_migrations); in dec_io_migrations()
1005 static void calc_discard_block_range(struct cache *cache, struct bio *bio, in calc_discard_block_range() argument
1011 *b = to_dblock(dm_sector_div_up(sb, cache->discard_block_size)); in calc_discard_block_range()
1013 if (se - sb < cache->discard_block_size) in calc_discard_block_range()
1016 *e = to_dblock(block_div(se, cache->discard_block_size)); in calc_discard_block_range()
1021 static void prevent_background_work(struct cache *cache) in prevent_background_work() argument
1024 down_write(&cache->background_work_lock); in prevent_background_work()
1028 static void allow_background_work(struct cache *cache) in allow_background_work() argument
1031 up_write(&cache->background_work_lock); in allow_background_work()
1035 static bool background_work_begin(struct cache *cache) in background_work_begin() argument
1040 r = down_read_trylock(&cache->background_work_lock); in background_work_begin()
1046 static void background_work_end(struct cache *cache) in background_work_end() argument
1049 up_read(&cache->background_work_lock); in background_work_end()
1055 static bool bio_writes_complete_block(struct cache *cache, struct bio *bio) in bio_writes_complete_block() argument
1058 (bio->bi_iter.bi_size == (cache->sectors_per_block << SECTOR_SHIFT)); in bio_writes_complete_block()
1061 static bool optimisable_bio(struct cache *cache, struct bio *bio, dm_oblock_t block) in optimisable_bio() argument
1063 return writeback_mode(cache) && in optimisable_bio()
1064 (is_discarded_oblock(cache, block) || bio_writes_complete_block(cache, bio)); in optimisable_bio()
1071 dm_cell_quiesce_v2(mg->cache->prison, mg->cell, &mg->k.ws); in quiesce()
1087 queue_continuation(mg->cache->wq, &mg->k); in copy_complete()
1093 struct cache *cache = mg->cache; in copy() local
1095 o_region.bdev = cache->origin_dev->bdev; in copy()
1096 o_region.sector = from_oblock(mg->op->oblock) * cache->sectors_per_block; in copy()
1097 o_region.count = cache->sectors_per_block; in copy()
1099 c_region.bdev = cache->cache_dev->bdev; in copy()
1100 c_region.sector = from_cblock(mg->op->cblock) * cache->sectors_per_block; in copy()
1101 c_region.count = cache->sectors_per_block; in copy()
1104 dm_kcopyd_copy(cache->copier, &o_region, 1, &c_region, 0, copy_complete, &mg->k); in copy()
1106 dm_kcopyd_copy(cache->copier, &c_region, 1, &o_region, 0, copy_complete, &mg->k); in copy()
1109 static void bio_drop_shared_lock(struct cache *cache, struct bio *bio) in bio_drop_shared_lock() argument
1113 if (pb->cell && dm_cell_put_v2(cache->prison, pb->cell)) in bio_drop_shared_lock()
1114 free_prison_cell(cache, pb->cell); in bio_drop_shared_lock()
1121 struct cache *cache = mg->cache; in overwrite_endio() local
1129 queue_continuation(cache->wq, &mg->k); in overwrite_endio()
1145 remap_to_cache(mg->cache, bio, mg->op->cblock); in overwrite()
1147 remap_to_origin(mg->cache, bio); in overwrite()
1150 accounted_request(mg->cache, bio); in overwrite()
1167 struct cache *cache = mg->cache; in mg_complete() local
1172 update_stats(&cache->stats, op->op); in mg_complete()
1176 clear_discard(cache, oblock_to_dblock(cache, op->oblock)); in mg_complete()
1177 policy_complete_background_work(cache->policy, op, success); in mg_complete()
1181 force_set_dirty(cache, cblock); in mg_complete()
1189 force_clear_dirty(cache, cblock); in mg_complete()
1190 dec_io_migrations(cache); in mg_complete()
1199 force_clear_dirty(cache, cblock); in mg_complete()
1200 policy_complete_background_work(cache->policy, op, success); in mg_complete()
1201 dec_io_migrations(cache); in mg_complete()
1206 force_clear_dirty(cache, cblock); in mg_complete()
1207 policy_complete_background_work(cache->policy, op, success); in mg_complete()
1208 dec_io_migrations(cache); in mg_complete()
1214 if (dm_cell_unlock_v2(cache->prison, mg->cell, &bios)) in mg_complete()
1215 free_prison_cell(cache, mg->cell); in mg_complete()
1219 defer_bios(cache, &bios); in mg_complete()
1220 wake_migration_worker(cache); in mg_complete()
1222 background_work_end(cache); in mg_complete()
1235 struct cache *cache = mg->cache; in mg_update_metadata() local
1240 r = dm_cache_insert_mapping(cache->cmd, op->cblock, op->oblock); in mg_update_metadata()
1243 cache_device_name(cache)); in mg_update_metadata()
1244 metadata_operation_failed(cache, "dm_cache_insert_mapping", r); in mg_update_metadata()
1253 r = dm_cache_remove_mapping(cache->cmd, op->cblock); in mg_update_metadata()
1256 cache_device_name(cache)); in mg_update_metadata()
1257 metadata_operation_failed(cache, "dm_cache_remove_mapping", r); in mg_update_metadata()
1268 * - vblock x in a cache block in mg_update_metadata()
1270 * - cache block gets reallocated and over written in mg_update_metadata()
1273 * When we recover, because there was no commit the cache will in mg_update_metadata()
1274 * rollback to having the data for vblock x in the cache block. in mg_update_metadata()
1275 * But the cache block has since been overwritten, so it'll end in mg_update_metadata()
1283 continue_after_commit(&cache->committer, &mg->k); in mg_update_metadata()
1284 schedule_commit(&cache->committer); in mg_update_metadata()
1321 r = dm_cell_lock_promote_v2(mg->cache->prison, mg->cell, in mg_upgrade_lock()
1337 struct cache *cache = mg->cache; in mg_full_copy() local
1341 if ((!is_policy_promote && !is_dirty(cache, op->cblock)) || in mg_full_copy()
1342 is_discarded_oblock(cache, op->oblock)) { in mg_full_copy()
1361 if (!optimisable_bio(mg->cache, mg->overwrite_bio, mg->op->oblock)) { in mg_copy()
1365 bool rb = bio_detain_shared(mg->cache, mg->op->oblock, mg->overwrite_bio); in mg_copy()
1368 inc_io_migrations(mg->cache); in mg_copy()
1390 struct cache *cache = mg->cache; in mg_lock_writes() local
1393 prealloc = alloc_prison_cell(cache); in mg_lock_writes()
1401 r = dm_cell_lock_v2(cache->prison, &key, in mg_lock_writes()
1405 free_prison_cell(cache, prealloc); in mg_lock_writes()
1411 free_prison_cell(cache, prealloc); in mg_lock_writes()
1421 static int mg_start(struct cache *cache, struct policy_work *op, struct bio *bio) in mg_start() argument
1425 if (!background_work_begin(cache)) { in mg_start()
1426 policy_complete_background_work(cache->policy, op, false); in mg_start()
1430 mg = alloc_migration(cache); in mg_start()
1436 inc_io_migrations(cache); in mg_start()
1448 struct cache *cache = mg->cache; in invalidate_complete() local
1451 if (dm_cell_unlock_v2(cache->prison, mg->cell, &bios)) in invalidate_complete()
1452 free_prison_cell(cache, mg->cell); in invalidate_complete()
1458 defer_bios(cache, &bios); in invalidate_complete()
1460 background_work_end(cache); in invalidate_complete()
1469 static int invalidate_cblock(struct cache *cache, dm_cblock_t cblock) in invalidate_cblock() argument
1471 int r = policy_invalidate_mapping(cache->policy, cblock); in invalidate_cblock()
1473 r = dm_cache_remove_mapping(cache->cmd, cblock); in invalidate_cblock()
1476 cache_device_name(cache)); in invalidate_cblock()
1477 metadata_operation_failed(cache, "dm_cache_remove_mapping", r); in invalidate_cblock()
1487 DMERR("%s: policy_invalidate_mapping failed", cache_device_name(cache)); in invalidate_cblock()
1496 struct cache *cache = mg->cache; in invalidate_remove() local
1498 r = invalidate_cblock(cache, mg->invalidate_cblock); in invalidate_remove()
1505 continue_after_commit(&cache->committer, &mg->k); in invalidate_remove()
1506 remap_to_origin_clear_discard(cache, mg->overwrite_bio, mg->invalidate_oblock); in invalidate_remove()
1508 schedule_commit(&cache->committer); in invalidate_remove()
1515 struct cache *cache = mg->cache; in invalidate_lock() local
1518 prealloc = alloc_prison_cell(cache); in invalidate_lock()
1521 r = dm_cell_lock_v2(cache->prison, &key, in invalidate_lock()
1524 free_prison_cell(cache, prealloc); in invalidate_lock()
1530 free_prison_cell(cache, prealloc); in invalidate_lock()
1541 queue_work(cache->wq, &mg->k.ws); in invalidate_lock()
1547 static int invalidate_start(struct cache *cache, dm_cblock_t cblock, in invalidate_start() argument
1552 if (!background_work_begin(cache)) in invalidate_start()
1555 mg = alloc_migration(cache); in invalidate_start()
1573 static enum busy spare_migration_bandwidth(struct cache *cache) in spare_migration_bandwidth() argument
1575 bool idle = dm_iot_idle_for(&cache->tracker, HZ); in spare_migration_bandwidth()
1576 sector_t current_volume = (atomic_read(&cache->nr_io_migrations) + 1) * in spare_migration_bandwidth()
1577 cache->sectors_per_block; in spare_migration_bandwidth()
1579 if (idle && current_volume <= cache->migration_threshold) in spare_migration_bandwidth()
1585 static void inc_hit_counter(struct cache *cache, struct bio *bio) in inc_hit_counter() argument
1588 &cache->stats.read_hit : &cache->stats.write_hit); in inc_hit_counter()
1591 static void inc_miss_counter(struct cache *cache, struct bio *bio) in inc_miss_counter() argument
1594 &cache->stats.read_miss : &cache->stats.write_miss); in inc_miss_counter()
1599 static int map_bio(struct cache *cache, struct bio *bio, dm_oblock_t block, in map_bio() argument
1608 rb = bio_detain_shared(cache, block, bio); in map_bio()
1622 if (optimisable_bio(cache, bio, block)) { in map_bio()
1625 r = policy_lookup_with_work(cache->policy, block, &cblock, data_dir, true, &op); in map_bio()
1628 cache_device_name(cache), r); in map_bio()
1634 bio_drop_shared_lock(cache, bio); in map_bio()
1636 mg_start(cache, op, bio); in map_bio()
1640 r = policy_lookup(cache->policy, block, &cblock, data_dir, false, &background_queued); in map_bio()
1643 cache_device_name(cache), r); in map_bio()
1649 wake_migration_worker(cache); in map_bio()
1658 inc_miss_counter(cache, bio); in map_bio()
1660 accounted_begin(cache, bio); in map_bio()
1661 remap_to_origin_clear_discard(cache, bio, block); in map_bio()
1674 inc_hit_counter(cache, bio); in map_bio()
1678 * cache blocks that are written to. in map_bio()
1680 if (passthrough_mode(cache)) { in map_bio()
1682 bio_drop_shared_lock(cache, bio); in map_bio()
1683 atomic_inc(&cache->stats.demotion); in map_bio()
1684 invalidate_start(cache, cblock, block, bio); in map_bio()
1686 remap_to_origin_clear_discard(cache, bio, block); in map_bio()
1688 if (bio_data_dir(bio) == WRITE && writethrough_mode(cache) && in map_bio()
1689 !is_dirty(cache, cblock)) { in map_bio()
1690 remap_to_origin_and_cache(cache, bio, block, cblock); in map_bio()
1691 accounted_begin(cache, bio); in map_bio()
1693 remap_to_cache_dirty(cache, bio, block, cblock); in map_bio()
1705 accounted_complete(cache, bio); in map_bio()
1706 issue_after_commit(&cache->committer, bio); in map_bio()
1714 static bool process_bio(struct cache *cache, struct bio *bio) in process_bio() argument
1718 if (map_bio(cache, bio, get_bio_block(cache, bio), &commit_needed) == DM_MAPIO_REMAPPED) in process_bio()
1727 static int commit(struct cache *cache, bool clean_shutdown) in commit() argument
1731 if (get_cache_mode(cache) >= CM_READ_ONLY) in commit()
1734 atomic_inc(&cache->stats.commit_count); in commit()
1735 r = dm_cache_commit(cache->cmd, clean_shutdown); in commit()
1737 metadata_operation_failed(cache, "dm_cache_commit", r); in commit()
1747 struct cache *cache = context; in commit_op() local
1749 if (dm_cache_changed_this_transaction(cache->cmd)) in commit_op()
1750 return errno_to_blk_status(commit(cache, false)); in commit_op()
1757 static bool process_flush_bio(struct cache *cache, struct bio *bio) in process_flush_bio() argument
1762 remap_to_origin(cache, bio); in process_flush_bio()
1764 remap_to_cache(cache, bio, 0); in process_flush_bio()
1766 issue_after_commit(&cache->committer, bio); in process_flush_bio()
1770 static bool process_discard_bio(struct cache *cache, struct bio *bio) in process_discard_bio() argument
1777 calc_discard_block_range(cache, bio, &b, &e); in process_discard_bio()
1779 set_discard(cache, b); in process_discard_bio()
1783 if (cache->features.discard_passdown) { in process_discard_bio()
1784 remap_to_origin(cache, bio); in process_discard_bio()
1794 struct cache *cache = container_of(ws, struct cache, deferred_bio_worker); in process_deferred_bios() local
1802 spin_lock_irq(&cache->lock); in process_deferred_bios()
1803 bio_list_merge(&bios, &cache->deferred_bios); in process_deferred_bios()
1804 bio_list_init(&cache->deferred_bios); in process_deferred_bios()
1805 spin_unlock_irq(&cache->lock); in process_deferred_bios()
1809 commit_needed = process_flush_bio(cache, bio) || commit_needed; in process_deferred_bios()
1812 commit_needed = process_discard_bio(cache, bio) || commit_needed; in process_deferred_bios()
1815 commit_needed = process_bio(cache, bio) || commit_needed; in process_deferred_bios()
1819 schedule_commit(&cache->committer); in process_deferred_bios()
1826 static void requeue_deferred_bios(struct cache *cache) in requeue_deferred_bios() argument
1832 bio_list_merge(&bios, &cache->deferred_bios); in requeue_deferred_bios()
1833 bio_list_init(&cache->deferred_bios); in requeue_deferred_bios()
1847 struct cache *cache = container_of(to_delayed_work(ws), struct cache, waker); in do_waker() local
1849 policy_tick(cache->policy, true); in do_waker()
1850 wake_migration_worker(cache); in do_waker()
1851 schedule_commit(&cache->committer); in do_waker()
1852 queue_delayed_work(cache->wq, &cache->waker, COMMIT_PERIOD); in do_waker()
1859 struct cache *cache = container_of(ws, struct cache, migration_worker); in check_migrations() local
1863 b = spare_migration_bandwidth(cache); in check_migrations()
1865 r = policy_get_background_work(cache->policy, b == IDLE, &op); in check_migrations()
1871 cache_device_name(cache)); in check_migrations()
1875 r = mg_start(cache, op, NULL); in check_migrations()
1889 static void destroy(struct cache *cache) in destroy() argument
1893 mempool_exit(&cache->migration_pool); in destroy()
1895 if (cache->prison) in destroy()
1896 dm_bio_prison_destroy_v2(cache->prison); in destroy()
1898 if (cache->wq) in destroy()
1899 destroy_workqueue(cache->wq); in destroy()
1901 if (cache->dirty_bitset) in destroy()
1902 free_bitset(cache->dirty_bitset); in destroy()
1904 if (cache->discard_bitset) in destroy()
1905 free_bitset(cache->discard_bitset); in destroy()
1907 if (cache->copier) in destroy()
1908 dm_kcopyd_client_destroy(cache->copier); in destroy()
1910 if (cache->cmd) in destroy()
1911 dm_cache_metadata_close(cache->cmd); in destroy()
1913 if (cache->metadata_dev) in destroy()
1914 dm_put_device(cache->ti, cache->metadata_dev); in destroy()
1916 if (cache->origin_dev) in destroy()
1917 dm_put_device(cache->ti, cache->origin_dev); in destroy()
1919 if (cache->cache_dev) in destroy()
1920 dm_put_device(cache->ti, cache->cache_dev); in destroy()
1922 if (cache->policy) in destroy()
1923 dm_cache_policy_destroy(cache->policy); in destroy()
1925 for (i = 0; i < cache->nr_ctr_args ; i++) in destroy()
1926 kfree(cache->ctr_args[i]); in destroy()
1927 kfree(cache->ctr_args); in destroy()
1929 bioset_exit(&cache->bs); in destroy()
1931 kfree(cache); in destroy()
1936 struct cache *cache = ti->private; in cache_dtr() local
1938 destroy(cache); in cache_dtr()
1949 * Construct a cache device mapping.
1951 * cache <metadata dev> <cache dev> <origin dev> <block size>
1956 * cache dev : fast device holding cached data blocks
1958 * block size : cache unit size in sectors
1968 * See cache-policies.txt for details.
1971 * writethrough : write through caching that prohibits cache block
1974 * back cache block contents later for performance reasons,
2057 *error = "Error opening cache device"; in parse_cache_dev()
2106 *error = "Data block size is larger than the cache device"; in parse_block_size()
2127 {0, 3, "Invalid number of cache feature arguments"}, in parse_features()
2166 *error = "Unrecognised cache feature requested"; in parse_features()
2172 *error = "Duplicate cache io_mode features requested"; in parse_features()
2245 static int process_config_option(struct cache *cache, const char *key, const char *value) in process_config_option() argument
2253 cache->migration_threshold = tmp; in process_config_option()
2260 static int set_config_value(struct cache *cache, const char *key, const char *value) in set_config_value() argument
2262 int r = process_config_option(cache, key, value); in set_config_value()
2265 r = policy_set_config_value(cache->policy, key, value); in set_config_value()
2273 static int set_config_values(struct cache *cache, int argc, const char **argv) in set_config_values() argument
2283 r = set_config_value(cache, argv[0], argv[1]); in set_config_values()
2294 static int create_cache_policy(struct cache *cache, struct cache_args *ca, in create_cache_policy() argument
2298 cache->cache_size, in create_cache_policy()
2299 cache->origin_sectors, in create_cache_policy()
2300 cache->sectors_per_block); in create_cache_policy()
2302 *error = "Error creating cache's policy"; in create_cache_policy()
2305 cache->policy = p; in create_cache_policy()
2306 BUG_ON(!cache->policy); in create_cache_policy()
2312 * We want the discard block size to be at least the size of the cache
2337 static void set_cache_size(struct cache *cache, dm_cblock_t size) in set_cache_size() argument
2341 if (nr_blocks > (1 << 20) && cache->cache_size != size) in set_cache_size()
2342 DMWARN_LIMIT("You have created a cache device with a lot of individual cache blocks (%llu)\n" in set_cache_size()
2344 "Please consider increasing the cache block size to reduce the overall cache block count.", in set_cache_size()
2347 cache->cache_size = size; in set_cache_size()
2352 static int cache_create(struct cache_args *ca, struct cache **result) in cache_create()
2356 struct cache *cache; in cache_create() local
2362 cache = kzalloc(sizeof(*cache), GFP_KERNEL); in cache_create()
2363 if (!cache) in cache_create()
2366 cache->ti = ca->ti; in cache_create()
2367 ti->private = cache; in cache_create()
2376 cache->features = ca->features; in cache_create()
2377 if (writethrough_mode(cache)) { in cache_create()
2379 r = bioset_init(&cache->bs, BIO_POOL_SIZE, 0, 0); in cache_create()
2384 cache->metadata_dev = ca->metadata_dev; in cache_create()
2385 cache->origin_dev = ca->origin_dev; in cache_create()
2386 cache->cache_dev = ca->cache_dev; in cache_create()
2390 origin_blocks = cache->origin_sectors = ca->origin_sectors; in cache_create()
2392 cache->origin_blocks = to_oblock(origin_blocks); in cache_create()
2394 cache->sectors_per_block = ca->block_size; in cache_create()
2395 if (dm_set_target_max_io_len(ti, cache->sectors_per_block)) { in cache_create()
2403 cache->sectors_per_block_shift = -1; in cache_create()
2405 set_cache_size(cache, to_cblock(cache_size)); in cache_create()
2407 cache->sectors_per_block_shift = __ffs(ca->block_size); in cache_create()
2408 set_cache_size(cache, to_cblock(ca->cache_sectors >> cache->sectors_per_block_shift)); in cache_create()
2411 r = create_cache_policy(cache, ca, error); in cache_create()
2415 cache->policy_nr_args = ca->policy_argc; in cache_create()
2416 cache->migration_threshold = DEFAULT_MIGRATION_THRESHOLD; in cache_create()
2418 r = set_config_values(cache, ca->policy_argc, ca->policy_argv); in cache_create()
2420 *error = "Error setting cache policy's config values"; in cache_create()
2424 cmd = dm_cache_metadata_open(cache->metadata_dev->bdev, in cache_create()
2426 dm_cache_policy_get_hint_size(cache->policy), in cache_create()
2433 cache->cmd = cmd; in cache_create()
2434 set_cache_mode(cache, CM_WRITE); in cache_create()
2435 if (get_cache_mode(cache) != CM_WRITE) { in cache_create()
2441 if (passthrough_mode(cache)) { in cache_create()
2444 r = dm_cache_metadata_all_clean(cache->cmd, &all_clean); in cache_create()
2456 policy_allow_migrations(cache->policy, false); in cache_create()
2459 spin_lock_init(&cache->lock); in cache_create()
2460 bio_list_init(&cache->deferred_bios); in cache_create()
2461 atomic_set(&cache->nr_allocated_migrations, 0); in cache_create()
2462 atomic_set(&cache->nr_io_migrations, 0); in cache_create()
2463 init_waitqueue_head(&cache->migration_wait); in cache_create()
2466 atomic_set(&cache->nr_dirty, 0); in cache_create()
2467 cache->dirty_bitset = alloc_bitset(from_cblock(cache->cache_size)); in cache_create()
2468 if (!cache->dirty_bitset) { in cache_create()
2472 clear_bitset(cache->dirty_bitset, from_cblock(cache->cache_size)); in cache_create()
2474 cache->discard_block_size = in cache_create()
2475 calculate_discard_block_size(cache->sectors_per_block, in cache_create()
2476 cache->origin_sectors); in cache_create()
2477 cache->discard_nr_blocks = to_dblock(dm_sector_div_up(cache->origin_sectors, in cache_create()
2478 cache->discard_block_size)); in cache_create()
2479 cache->discard_bitset = alloc_bitset(from_dblock(cache->discard_nr_blocks)); in cache_create()
2480 if (!cache->discard_bitset) { in cache_create()
2484 clear_bitset(cache->discard_bitset, from_dblock(cache->discard_nr_blocks)); in cache_create()
2486 cache->copier = dm_kcopyd_client_create(&dm_kcopyd_throttle); in cache_create()
2487 if (IS_ERR(cache->copier)) { in cache_create()
2489 r = PTR_ERR(cache->copier); in cache_create()
2493 cache->wq = alloc_workqueue("dm-" DM_MSG_PREFIX, WQ_MEM_RECLAIM, 0); in cache_create()
2494 if (!cache->wq) { in cache_create()
2498 INIT_WORK(&cache->deferred_bio_worker, process_deferred_bios); in cache_create()
2499 INIT_WORK(&cache->migration_worker, check_migrations); in cache_create()
2500 INIT_DELAYED_WORK(&cache->waker, do_waker); in cache_create()
2502 cache->prison = dm_bio_prison_create_v2(cache->wq); in cache_create()
2503 if (!cache->prison) { in cache_create()
2508 r = mempool_init_slab_pool(&cache->migration_pool, MIGRATION_POOL_SIZE, in cache_create()
2511 *error = "Error creating cache's migration mempool"; in cache_create()
2515 cache->need_tick_bio = true; in cache_create()
2516 cache->sized = false; in cache_create()
2517 cache->invalidate = false; in cache_create()
2518 cache->commit_requested = false; in cache_create()
2519 cache->loaded_mappings = false; in cache_create()
2520 cache->loaded_discards = false; in cache_create()
2522 load_stats(cache); in cache_create()
2524 atomic_set(&cache->stats.demotion, 0); in cache_create()
2525 atomic_set(&cache->stats.promotion, 0); in cache_create()
2526 atomic_set(&cache->stats.copies_avoided, 0); in cache_create()
2527 atomic_set(&cache->stats.cache_cell_clash, 0); in cache_create()
2528 atomic_set(&cache->stats.commit_count, 0); in cache_create()
2529 atomic_set(&cache->stats.discard_count, 0); in cache_create()
2531 spin_lock_init(&cache->invalidation_lock); in cache_create()
2532 INIT_LIST_HEAD(&cache->invalidation_requests); in cache_create()
2534 batcher_init(&cache->committer, commit_op, cache, in cache_create()
2535 issue_op, cache, cache->wq); in cache_create()
2536 dm_iot_init(&cache->tracker); in cache_create()
2538 init_rwsem(&cache->background_work_lock); in cache_create()
2539 prevent_background_work(cache); in cache_create()
2541 *result = cache; in cache_create()
2544 destroy(cache); in cache_create()
2548 static int copy_ctr_args(struct cache *cache, int argc, const char **argv) in copy_ctr_args() argument
2566 cache->nr_ctr_args = argc; in copy_ctr_args()
2567 cache->ctr_args = copy; in copy_ctr_args()
2576 struct cache *cache = NULL; in cache_ctr() local
2580 ti->error = "Error allocating memory for cache"; in cache_ctr()
2589 r = cache_create(ca, &cache); in cache_ctr()
2593 r = copy_ctr_args(cache, argc - 3, (const char **)argv + 3); in cache_ctr()
2595 destroy(cache); in cache_ctr()
2599 ti->private = cache; in cache_ctr()
2609 struct cache *cache = ti->private; in cache_map() local
2613 dm_oblock_t block = get_bio_block(cache, bio); in cache_map()
2616 if (unlikely(from_oblock(block) >= from_oblock(cache->origin_blocks))) { in cache_map()
2619 * the end of the origin device. We don't cache these. in cache_map()
2622 remap_to_origin(cache, bio); in cache_map()
2623 accounted_begin(cache, bio); in cache_map()
2628 defer_bio(cache, bio); in cache_map()
2632 r = map_bio(cache, bio, block, &commit_needed); in cache_map()
2634 schedule_commit(&cache->committer); in cache_map()
2641 struct cache *cache = ti->private; in cache_end_io() local
2646 policy_tick(cache->policy, false); in cache_end_io()
2648 spin_lock_irqsave(&cache->lock, flags); in cache_end_io()
2649 cache->need_tick_bio = true; in cache_end_io()
2650 spin_unlock_irqrestore(&cache->lock, flags); in cache_end_io()
2653 bio_drop_shared_lock(cache, bio); in cache_end_io()
2654 accounted_complete(cache, bio); in cache_end_io()
2659 static int write_dirty_bitset(struct cache *cache) in write_dirty_bitset() argument
2663 if (get_cache_mode(cache) >= CM_READ_ONLY) in write_dirty_bitset()
2666 r = dm_cache_set_dirty_bits(cache->cmd, from_cblock(cache->cache_size), cache->dirty_bitset); in write_dirty_bitset()
2668 metadata_operation_failed(cache, "dm_cache_set_dirty_bits", r); in write_dirty_bitset()
2673 static int write_discard_bitset(struct cache *cache) in write_discard_bitset() argument
2677 if (get_cache_mode(cache) >= CM_READ_ONLY) in write_discard_bitset()
2680 r = dm_cache_discard_bitset_resize(cache->cmd, cache->discard_block_size, in write_discard_bitset()
2681 cache->discard_nr_blocks); in write_discard_bitset()
2683 DMERR("%s: could not resize on-disk discard bitset", cache_device_name(cache)); in write_discard_bitset()
2684 metadata_operation_failed(cache, "dm_cache_discard_bitset_resize", r); in write_discard_bitset()
2688 for (i = 0; i < from_dblock(cache->discard_nr_blocks); i++) { in write_discard_bitset()
2689 r = dm_cache_set_discard(cache->cmd, to_dblock(i), in write_discard_bitset()
2690 is_discarded(cache, to_dblock(i))); in write_discard_bitset()
2692 metadata_operation_failed(cache, "dm_cache_set_discard", r); in write_discard_bitset()
2700 static int write_hints(struct cache *cache) in write_hints() argument
2704 if (get_cache_mode(cache) >= CM_READ_ONLY) in write_hints()
2707 r = dm_cache_write_hints(cache->cmd, cache->policy); in write_hints()
2709 metadata_operation_failed(cache, "dm_cache_write_hints", r); in write_hints()
2719 static bool sync_metadata(struct cache *cache) in sync_metadata() argument
2723 r1 = write_dirty_bitset(cache); in sync_metadata()
2725 DMERR("%s: could not write dirty bitset", cache_device_name(cache)); in sync_metadata()
2727 r2 = write_discard_bitset(cache); in sync_metadata()
2729 DMERR("%s: could not write discard bitset", cache_device_name(cache)); in sync_metadata()
2731 save_stats(cache); in sync_metadata()
2733 r3 = write_hints(cache); in sync_metadata()
2735 DMERR("%s: could not write hints", cache_device_name(cache)); in sync_metadata()
2742 r4 = commit(cache, !r1 && !r2 && !r3); in sync_metadata()
2744 DMERR("%s: could not write cache metadata", cache_device_name(cache)); in sync_metadata()
2751 struct cache *cache = ti->private; in cache_postsuspend() local
2753 prevent_background_work(cache); in cache_postsuspend()
2754 BUG_ON(atomic_read(&cache->nr_io_migrations)); in cache_postsuspend()
2756 cancel_delayed_work_sync(&cache->waker); in cache_postsuspend()
2757 drain_workqueue(cache->wq); in cache_postsuspend()
2758 WARN_ON(cache->tracker.in_flight); in cache_postsuspend()
2764 requeue_deferred_bios(cache); in cache_postsuspend()
2766 if (get_cache_mode(cache) == CM_WRITE) in cache_postsuspend()
2767 (void) sync_metadata(cache); in cache_postsuspend()
2773 struct cache *cache = context; in load_mapping() local
2776 set_bit(from_cblock(cblock), cache->dirty_bitset); in load_mapping()
2777 atomic_inc(&cache->nr_dirty); in load_mapping()
2779 clear_bit(from_cblock(cblock), cache->dirty_bitset); in load_mapping()
2781 return policy_load_mapping(cache->policy, oblock, cblock, dirty, hint, hint_valid); in load_mapping()
2791 struct cache *cache; member
2801 static void discard_load_info_init(struct cache *cache, in discard_load_info_init() argument
2804 li->cache = cache; in discard_load_info_init()
2824 b = dm_sector_div_up(b, li->cache->discard_block_size); in set_discard_range()
2825 sector_div(e, li->cache->discard_block_size); in set_discard_range()
2831 if (e > from_dblock(li->cache->discard_nr_blocks)) in set_discard_range()
2832 e = from_dblock(li->cache->discard_nr_blocks); in set_discard_range()
2835 set_discard(li->cache, to_dblock(b)); in set_discard_range()
2868 static dm_cblock_t get_cache_dev_size(struct cache *cache) in get_cache_dev_size() argument
2870 sector_t size = get_dev_size(cache->cache_dev); in get_cache_dev_size()
2871 (void) sector_div(size, cache->sectors_per_block); in get_cache_dev_size()
2875 static bool can_resize(struct cache *cache, dm_cblock_t new_size) in can_resize() argument
2877 if (from_cblock(new_size) > from_cblock(cache->cache_size)) { in can_resize()
2878 if (cache->sized) { in can_resize()
2879 DMERR("%s: unable to extend cache due to missing cache table reload", in can_resize()
2880 cache_device_name(cache)); in can_resize()
2886 * We can't drop a dirty block when shrinking the cache. in can_resize()
2888 while (from_cblock(new_size) < from_cblock(cache->cache_size)) { in can_resize()
2890 if (is_dirty(cache, new_size)) { in can_resize()
2891 DMERR("%s: unable to shrink cache; cache block %llu is dirty", in can_resize()
2892 cache_device_name(cache), in can_resize()
2901 static int resize_cache_dev(struct cache *cache, dm_cblock_t new_size) in resize_cache_dev() argument
2905 r = dm_cache_resize(cache->cmd, new_size); in resize_cache_dev()
2907 DMERR("%s: could not resize cache metadata", cache_device_name(cache)); in resize_cache_dev()
2908 metadata_operation_failed(cache, "dm_cache_resize", r); in resize_cache_dev()
2912 set_cache_size(cache, new_size); in resize_cache_dev()
2920 struct cache *cache = ti->private; in cache_preresume() local
2921 dm_cblock_t csize = get_cache_dev_size(cache); in cache_preresume()
2924 * Check to see if the cache has resized. in cache_preresume()
2926 if (!cache->sized) { in cache_preresume()
2927 r = resize_cache_dev(cache, csize); in cache_preresume()
2931 cache->sized = true; in cache_preresume()
2933 } else if (csize != cache->cache_size) { in cache_preresume()
2934 if (!can_resize(cache, csize)) in cache_preresume()
2937 r = resize_cache_dev(cache, csize); in cache_preresume()
2942 if (!cache->loaded_mappings) { in cache_preresume()
2943 r = dm_cache_load_mappings(cache->cmd, cache->policy, in cache_preresume()
2944 load_mapping, cache); in cache_preresume()
2946 DMERR("%s: could not load cache mappings", cache_device_name(cache)); in cache_preresume()
2947 metadata_operation_failed(cache, "dm_cache_load_mappings", r); in cache_preresume()
2951 cache->loaded_mappings = true; in cache_preresume()
2954 if (!cache->loaded_discards) { in cache_preresume()
2962 clear_bitset(cache->discard_bitset, from_dblock(cache->discard_nr_blocks)); in cache_preresume()
2964 discard_load_info_init(cache, &li); in cache_preresume()
2965 r = dm_cache_load_discards(cache->cmd, load_discard, &li); in cache_preresume()
2967 DMERR("%s: could not load origin discards", cache_device_name(cache)); in cache_preresume()
2968 metadata_operation_failed(cache, "dm_cache_load_discards", r); in cache_preresume()
2973 cache->loaded_discards = true; in cache_preresume()
2981 struct cache *cache = ti->private; in cache_resume() local
2983 cache->need_tick_bio = true; in cache_resume()
2984 allow_background_work(cache); in cache_resume()
2985 do_waker(&cache->waker.work); in cache_resume()
2988 static void emit_flags(struct cache *cache, char *result, in emit_flags() argument
2992 struct cache_features *cf = &cache->features; in emit_flags()
3000 if (writethrough_mode(cache)) in emit_flags()
3003 else if (passthrough_mode(cache)) in emit_flags()
3006 else if (writeback_mode(cache)) in emit_flags()
3012 cache_device_name(cache), (int) cf->io_mode); in emit_flags()
3025 * <cache block size> <#used cache blocks>/<#total cache blocks>
3030 * <policy name> <#policy args> <policy args>* <cache metadata mode> <needs_check>
3041 struct cache *cache = ti->private; in cache_status() local
3047 if (get_cache_mode(cache) == CM_FAIL) { in cache_status()
3054 (void) commit(cache, false); in cache_status()
3056 r = dm_cache_get_free_metadata_block_count(cache->cmd, &nr_free_blocks_metadata); in cache_status()
3059 cache_device_name(cache), r); in cache_status()
3063 r = dm_cache_get_metadata_dev_size(cache->cmd, &nr_blocks_metadata); in cache_status()
3066 cache_device_name(cache), r); in cache_status()
3070 residency = policy_residency(cache->policy); in cache_status()
3076 (unsigned long long)cache->sectors_per_block, in cache_status()
3078 (unsigned long long) from_cblock(cache->cache_size), in cache_status()
3079 (unsigned) atomic_read(&cache->stats.read_hit), in cache_status()
3080 (unsigned) atomic_read(&cache->stats.read_miss), in cache_status()
3081 (unsigned) atomic_read(&cache->stats.write_hit), in cache_status()
3082 (unsigned) atomic_read(&cache->stats.write_miss), in cache_status()
3083 (unsigned) atomic_read(&cache->stats.demotion), in cache_status()
3084 (unsigned) atomic_read(&cache->stats.promotion), in cache_status()
3085 (unsigned long) atomic_read(&cache->nr_dirty)); in cache_status()
3087 emit_flags(cache, result, maxlen, &sz); in cache_status()
3089 DMEMIT("2 migration_threshold %llu ", (unsigned long long) cache->migration_threshold); in cache_status()
3091 DMEMIT("%s ", dm_cache_policy_get_name(cache->policy)); in cache_status()
3093 r = policy_emit_config_values(cache->policy, result, maxlen, &sz); in cache_status()
3096 cache_device_name(cache), r); in cache_status()
3099 if (get_cache_mode(cache) == CM_READ_ONLY) in cache_status()
3104 r = dm_cache_metadata_needs_check(cache->cmd, &needs_check); in cache_status()
3114 format_dev_t(buf, cache->metadata_dev->bdev->bd_dev); in cache_status()
3116 format_dev_t(buf, cache->cache_dev->bdev->bd_dev); in cache_status()
3118 format_dev_t(buf, cache->origin_dev->bdev->bd_dev); in cache_status()
3121 for (i = 0; i < cache->nr_ctr_args - 1; i++) in cache_status()
3122 DMEMIT(" %s", cache->ctr_args[i]); in cache_status()
3123 if (cache->nr_ctr_args) in cache_status()
3124 DMEMIT(" %s", cache->ctr_args[cache->nr_ctr_args - 1]); in cache_status()
3129 if (get_cache_mode(cache) == CM_FAIL) in cache_status()
3131 else if (get_cache_mode(cache) == CM_READ_ONLY) in cache_status()
3136 format_dev_t(buf, cache->metadata_dev->bdev->bd_dev); in cache_status()
3138 format_dev_t(buf, cache->cache_dev->bdev->bd_dev); in cache_status()
3140 format_dev_t(buf, cache->origin_dev->bdev->bd_dev); in cache_status()
3142 DMEMIT(",writethrough=%c", writethrough_mode(cache) ? 'y' : 'n'); in cache_status()
3143 DMEMIT(",writeback=%c", writeback_mode(cache) ? 'y' : 'n'); in cache_status()
3144 DMEMIT(",passthrough=%c", passthrough_mode(cache) ? 'y' : 'n'); in cache_status()
3145 DMEMIT(",metadata2=%c", cache->features.metadata_version == 2 ? 'y' : 'n'); in cache_status()
3146 DMEMIT(",no_discard_passdown=%c", cache->features.discard_passdown ? 'n' : 'y'); in cache_status()
3167 * A cache block range can take two forms:
3172 static int parse_cblock_range(struct cache *cache, const char *str, in parse_cblock_range() argument
3205 DMERR("%s: invalid cblock range '%s'", cache_device_name(cache), str); in parse_cblock_range()
3209 static int validate_cblock_range(struct cache *cache, struct cblock_range *range) in validate_cblock_range() argument
3213 uint64_t n = from_cblock(cache->cache_size); in validate_cblock_range()
3217 cache_device_name(cache), b, n); in validate_cblock_range()
3223 cache_device_name(cache), e, n); in validate_cblock_range()
3229 cache_device_name(cache), b, e); in validate_cblock_range()
3241 static int request_invalidation(struct cache *cache, struct cblock_range *range) in request_invalidation() argument
3252 r = invalidate_cblock(cache, range->begin); in request_invalidation()
3259 cache->commit_requested = true; in request_invalidation()
3263 static int process_invalidate_cblocks_message(struct cache *cache, unsigned count, in process_invalidate_cblocks_message() argument
3270 if (!passthrough_mode(cache)) { in process_invalidate_cblocks_message()
3271 DMERR("%s: cache has to be in passthrough mode for invalidation", in process_invalidate_cblocks_message()
3272 cache_device_name(cache)); in process_invalidate_cblocks_message()
3277 r = parse_cblock_range(cache, cblock_ranges[i], &range); in process_invalidate_cblocks_message()
3281 r = validate_cblock_range(cache, &range); in process_invalidate_cblocks_message()
3288 r = request_invalidation(cache, &range); in process_invalidate_cblocks_message()
3302 * The key migration_threshold is supported by the cache target core.
3307 struct cache *cache = ti->private; in cache_message() local
3312 if (get_cache_mode(cache) >= CM_READ_ONLY) { in cache_message()
3313 DMERR("%s: unable to service cache target messages in READ_ONLY or FAIL mode", in cache_message()
3314 cache_device_name(cache)); in cache_message()
3319 return process_invalidate_cblocks_message(cache, argc - 1, (const char **) argv + 1); in cache_message()
3324 return set_config_value(cache, argv[0], argv[1]); in cache_message()
3331 struct cache *cache = ti->private; in cache_iterate_devices() local
3333 r = fn(ti, cache->cache_dev, 0, get_dev_size(cache->cache_dev), data); in cache_iterate_devices()
3335 r = fn(ti, cache->origin_dev, 0, ti->len, data); in cache_iterate_devices()
3351 static void disable_passdown_if_not_supported(struct cache *cache) in disable_passdown_if_not_supported() argument
3353 struct block_device *origin_bdev = cache->origin_dev->bdev; in disable_passdown_if_not_supported()
3358 if (!cache->features.discard_passdown) in disable_passdown_if_not_supported()
3364 else if (origin_limits->max_discard_sectors < cache->sectors_per_block) in disable_passdown_if_not_supported()
3370 cache->features.discard_passdown = false; in disable_passdown_if_not_supported()
3374 static void set_discard_limits(struct cache *cache, struct queue_limits *limits) in set_discard_limits() argument
3376 struct block_device *origin_bdev = cache->origin_dev->bdev; in set_discard_limits()
3379 if (!cache->features.discard_passdown) { in set_discard_limits()
3381 limits->max_discard_sectors = min_t(sector_t, cache->discard_block_size * 1024, in set_discard_limits()
3382 cache->origin_sectors); in set_discard_limits()
3383 limits->discard_granularity = cache->discard_block_size << SECTOR_SHIFT; in set_discard_limits()
3400 struct cache *cache = ti->private; in cache_io_hints() local
3405 * cache's blocksize (io_opt is a factor) do not override them. in cache_io_hints()
3407 if (io_opt_sectors < cache->sectors_per_block || in cache_io_hints()
3408 do_div(io_opt_sectors, cache->sectors_per_block)) { in cache_io_hints()
3409 blk_limits_io_min(limits, cache->sectors_per_block << SECTOR_SHIFT); in cache_io_hints()
3410 blk_limits_io_opt(limits, cache->sectors_per_block << SECTOR_SHIFT); in cache_io_hints()
3413 disable_passdown_if_not_supported(cache); in cache_io_hints()
3414 set_discard_limits(cache, limits); in cache_io_hints()
3420 .name = "cache",
3446 DMERR("cache target registration failed: %d", r); in dm_cache_init()
3463 MODULE_DESCRIPTION(DM_NAME " cache target");