Lines Matching full:cache
11 #include "dm-cache-metadata.h"
13 #include "dm-cache-background-tracker.h"
25 #define DM_MSG_PREFIX "cache"
28 "A percentage of time allocated for copying to and/or from cache");
36 * cblock: index of a cache block
37 * promotion: movement of a block from origin to cache
38 * demotion: movement of a block from cache to origin
39 * migration: movement of a block between the origin and cache device,
242 * The block size of the device holding cache data must be
257 * dirty. If you lose the cache device you will lose data.
263 * Data is written to both cache and origin. Blocks are never
269 * A degraded mode useful for various cache coherency situations
271 * origin. If a write goes to a cached oblock, then the cache
298 struct cache { struct
332 * Size of the cache device in blocks. argument
387 * Cache features such as write-through.
422 struct cache *cache; argument
434 static bool writethrough_mode(struct cache *cache) in writethrough_mode() argument
436 return cache->features.io_mode == CM_IO_WRITETHROUGH; in writethrough_mode()
439 static bool writeback_mode(struct cache *cache) in writeback_mode() argument
441 return cache->features.io_mode == CM_IO_WRITEBACK; in writeback_mode()
444 static inline bool passthrough_mode(struct cache *cache) in passthrough_mode() argument
446 return unlikely(cache->features.io_mode == CM_IO_PASSTHROUGH); in passthrough_mode()
451 static void wake_deferred_bio_worker(struct cache *cache) in wake_deferred_bio_worker() argument
453 queue_work(cache->wq, &cache->deferred_bio_worker); in wake_deferred_bio_worker()
456 static void wake_migration_worker(struct cache *cache) in wake_migration_worker() argument
458 if (passthrough_mode(cache)) in wake_migration_worker()
461 queue_work(cache->wq, &cache->migration_worker); in wake_migration_worker()
466 static struct dm_bio_prison_cell_v2 *alloc_prison_cell(struct cache *cache) in alloc_prison_cell() argument
468 return dm_bio_prison_alloc_cell_v2(cache->prison, GFP_NOIO); in alloc_prison_cell()
471 static void free_prison_cell(struct cache *cache, struct dm_bio_prison_cell_v2 *cell) in free_prison_cell() argument
473 dm_bio_prison_free_cell_v2(cache->prison, cell); in free_prison_cell()
476 static struct dm_cache_migration *alloc_migration(struct cache *cache) in alloc_migration() argument
480 mg = mempool_alloc(&cache->migration_pool, GFP_NOIO); in alloc_migration()
484 mg->cache = cache; in alloc_migration()
485 atomic_inc(&cache->nr_allocated_migrations); in alloc_migration()
492 struct cache *cache = mg->cache; in free_migration() local
494 if (atomic_dec_and_test(&cache->nr_allocated_migrations)) in free_migration()
495 wake_up(&cache->migration_wait); in free_migration()
497 mempool_free(mg, &cache->migration_pool); in free_migration()
557 static void defer_bio(struct cache *cache, struct bio *bio) in defer_bio() argument
559 spin_lock_irq(&cache->lock); in defer_bio()
560 bio_list_add(&cache->deferred_bios, bio); in defer_bio()
561 spin_unlock_irq(&cache->lock); in defer_bio()
563 wake_deferred_bio_worker(cache); in defer_bio()
566 static void defer_bios(struct cache *cache, struct bio_list *bios) in defer_bios() argument
568 spin_lock_irq(&cache->lock); in defer_bios()
569 bio_list_merge(&cache->deferred_bios, bios); in defer_bios()
571 spin_unlock_irq(&cache->lock); in defer_bios()
573 wake_deferred_bio_worker(cache); in defer_bios()
578 static bool bio_detain_shared(struct cache *cache, dm_oblock_t oblock, struct bio *bio) in bio_detain_shared() argument
586 cell_prealloc = alloc_prison_cell(cache); /* FIXME: allow wait if calling from worker */ in bio_detain_shared()
589 r = dm_cell_get_v2(cache->prison, &key, lock_level(bio), bio, cell_prealloc, &cell); in bio_detain_shared()
594 free_prison_cell(cache, cell_prealloc); in bio_detain_shared()
599 free_prison_cell(cache, cell_prealloc); in bio_detain_shared()
609 static bool is_dirty(struct cache *cache, dm_cblock_t b) in is_dirty() argument
611 return test_bit(from_cblock(b), cache->dirty_bitset); in is_dirty()
614 static void set_dirty(struct cache *cache, dm_cblock_t cblock) in set_dirty() argument
616 if (!test_and_set_bit(from_cblock(cblock), cache->dirty_bitset)) { in set_dirty()
617 atomic_inc(&cache->nr_dirty); in set_dirty()
618 policy_set_dirty(cache->policy, cblock); in set_dirty()
626 static void force_set_dirty(struct cache *cache, dm_cblock_t cblock) in force_set_dirty() argument
628 if (!test_and_set_bit(from_cblock(cblock), cache->dirty_bitset)) in force_set_dirty()
629 atomic_inc(&cache->nr_dirty); in force_set_dirty()
630 policy_set_dirty(cache->policy, cblock); in force_set_dirty()
633 static void force_clear_dirty(struct cache *cache, dm_cblock_t cblock) in force_clear_dirty() argument
635 if (test_and_clear_bit(from_cblock(cblock), cache->dirty_bitset)) { in force_clear_dirty()
636 if (atomic_dec_return(&cache->nr_dirty) == 0) in force_clear_dirty()
637 dm_table_event(cache->ti->table); in force_clear_dirty()
640 policy_clear_dirty(cache->policy, cblock); in force_clear_dirty()
645 static bool block_size_is_power_of_two(struct cache *cache) in block_size_is_power_of_two() argument
647 return cache->sectors_per_block_shift >= 0; in block_size_is_power_of_two()
657 static dm_block_t oblocks_per_dblock(struct cache *cache) in oblocks_per_dblock() argument
659 dm_block_t oblocks = cache->discard_block_size; in oblocks_per_dblock()
661 if (block_size_is_power_of_two(cache)) in oblocks_per_dblock()
662 oblocks >>= cache->sectors_per_block_shift; in oblocks_per_dblock()
664 oblocks = block_div(oblocks, cache->sectors_per_block); in oblocks_per_dblock()
669 static dm_dblock_t oblock_to_dblock(struct cache *cache, dm_oblock_t oblock) in oblock_to_dblock() argument
672 oblocks_per_dblock(cache))); in oblock_to_dblock()
675 static void set_discard(struct cache *cache, dm_dblock_t b) in set_discard() argument
677 BUG_ON(from_dblock(b) >= from_dblock(cache->discard_nr_blocks)); in set_discard()
678 atomic_inc(&cache->stats.discard_count); in set_discard()
680 spin_lock_irq(&cache->lock); in set_discard()
681 set_bit(from_dblock(b), cache->discard_bitset); in set_discard()
682 spin_unlock_irq(&cache->lock); in set_discard()
685 static void clear_discard(struct cache *cache, dm_dblock_t b) in clear_discard() argument
687 spin_lock_irq(&cache->lock); in clear_discard()
688 clear_bit(from_dblock(b), cache->discard_bitset); in clear_discard()
689 spin_unlock_irq(&cache->lock); in clear_discard()
692 static bool is_discarded(struct cache *cache, dm_dblock_t b) in is_discarded() argument
696 spin_lock_irq(&cache->lock); in is_discarded()
697 r = test_bit(from_dblock(b), cache->discard_bitset); in is_discarded()
698 spin_unlock_irq(&cache->lock); in is_discarded()
703 static bool is_discarded_oblock(struct cache *cache, dm_oblock_t b) in is_discarded_oblock() argument
707 spin_lock_irq(&cache->lock); in is_discarded_oblock()
708 r = test_bit(from_dblock(oblock_to_dblock(cache, b)), in is_discarded_oblock()
709 cache->discard_bitset); in is_discarded_oblock()
710 spin_unlock_irq(&cache->lock); in is_discarded_oblock()
720 static void remap_to_origin(struct cache *cache, struct bio *bio) in remap_to_origin() argument
722 bio_set_dev(bio, cache->origin_dev->bdev); in remap_to_origin()
725 static void remap_to_cache(struct cache *cache, struct bio *bio, in remap_to_cache() argument
731 bio_set_dev(bio, cache->cache_dev->bdev); in remap_to_cache()
732 if (!block_size_is_power_of_two(cache)) in remap_to_cache()
734 (block * cache->sectors_per_block) + in remap_to_cache()
735 sector_div(bi_sector, cache->sectors_per_block); in remap_to_cache()
738 (block << cache->sectors_per_block_shift) | in remap_to_cache()
739 (bi_sector & (cache->sectors_per_block - 1)); in remap_to_cache()
742 static void check_if_tick_bio_needed(struct cache *cache, struct bio *bio) in check_if_tick_bio_needed() argument
746 spin_lock_irq(&cache->lock); in check_if_tick_bio_needed()
747 if (cache->need_tick_bio && !op_is_flush(bio->bi_opf) && in check_if_tick_bio_needed()
751 cache->need_tick_bio = false; in check_if_tick_bio_needed()
753 spin_unlock_irq(&cache->lock); in check_if_tick_bio_needed()
756 static void remap_to_origin_clear_discard(struct cache *cache, struct bio *bio, in remap_to_origin_clear_discard() argument
760 check_if_tick_bio_needed(cache, bio); in remap_to_origin_clear_discard()
761 remap_to_origin(cache, bio); in remap_to_origin_clear_discard()
763 clear_discard(cache, oblock_to_dblock(cache, oblock)); in remap_to_origin_clear_discard()
766 static void remap_to_cache_dirty(struct cache *cache, struct bio *bio, in remap_to_cache_dirty() argument
769 check_if_tick_bio_needed(cache, bio); in remap_to_cache_dirty()
770 remap_to_cache(cache, bio, cblock); in remap_to_cache_dirty()
772 set_dirty(cache, cblock); in remap_to_cache_dirty()
773 clear_discard(cache, oblock_to_dblock(cache, oblock)); in remap_to_cache_dirty()
777 static dm_oblock_t get_bio_block(struct cache *cache, struct bio *bio) in get_bio_block() argument
781 if (!block_size_is_power_of_two(cache)) in get_bio_block()
782 (void) sector_div(block_nr, cache->sectors_per_block); in get_bio_block()
784 block_nr >>= cache->sectors_per_block_shift; in get_bio_block()
789 static bool accountable_bio(struct cache *cache, struct bio *bio) in accountable_bio() argument
794 static void accounted_begin(struct cache *cache, struct bio *bio) in accounted_begin() argument
798 if (accountable_bio(cache, bio)) { in accounted_begin()
801 dm_iot_io_begin(&cache->tracker, pb->len); in accounted_begin()
805 static void accounted_complete(struct cache *cache, struct bio *bio) in accounted_complete() argument
809 dm_iot_io_end(&cache->tracker, pb->len); in accounted_complete()
812 static void accounted_request(struct cache *cache, struct bio *bio) in accounted_request() argument
814 accounted_begin(cache, bio); in accounted_request()
820 struct cache *cache = context; in issue_op() local
822 accounted_request(cache, bio); in issue_op()
827 * to both the cache and origin devices. Clone the bio and send them in parallel.
829 static void remap_to_origin_and_cache(struct cache *cache, struct bio *bio, in remap_to_origin_and_cache() argument
832 struct bio *origin_bio = bio_alloc_clone(cache->origin_dev->bdev, bio, in remap_to_origin_and_cache()
833 GFP_NOIO, &cache->bs); in remap_to_origin_and_cache()
840 clear_discard(cache, oblock_to_dblock(cache, oblock)); in remap_to_origin_and_cache()
843 remap_to_cache(cache, bio, cblock); in remap_to_origin_and_cache()
851 static enum cache_metadata_mode get_cache_mode(struct cache *cache) in get_cache_mode() argument
853 return cache->features.mode; in get_cache_mode()
856 static const char *cache_device_name(struct cache *cache) in cache_device_name() argument
858 return dm_table_device_name(cache->ti->table); in cache_device_name()
861 static void notify_mode_switch(struct cache *cache, enum cache_metadata_mode mode) in notify_mode_switch() argument
869 dm_table_event(cache->ti->table); in notify_mode_switch()
870 DMINFO("%s: switching cache to %s mode", in notify_mode_switch()
871 cache_device_name(cache), descs[(int)mode]); in notify_mode_switch()
874 static void set_cache_mode(struct cache *cache, enum cache_metadata_mode new_mode) in set_cache_mode() argument
877 enum cache_metadata_mode old_mode = get_cache_mode(cache); in set_cache_mode()
879 if (dm_cache_metadata_needs_check(cache->cmd, &needs_check)) { in set_cache_mode()
881 cache_device_name(cache)); in set_cache_mode()
886 DMERR("%s: unable to switch cache to write mode until repaired.", in set_cache_mode()
887 cache_device_name(cache)); in set_cache_mode()
901 dm_cache_metadata_set_read_only(cache->cmd); in set_cache_mode()
905 dm_cache_metadata_set_read_write(cache->cmd); in set_cache_mode()
909 cache->features.mode = new_mode; in set_cache_mode()
912 notify_mode_switch(cache, new_mode); in set_cache_mode()
915 static void abort_transaction(struct cache *cache) in abort_transaction() argument
917 const char *dev_name = cache_device_name(cache); in abort_transaction()
919 if (get_cache_mode(cache) >= CM_READ_ONLY) in abort_transaction()
923 if (dm_cache_metadata_abort(cache->cmd)) { in abort_transaction()
925 set_cache_mode(cache, CM_FAIL); in abort_transaction()
928 if (dm_cache_metadata_set_needs_check(cache->cmd)) { in abort_transaction()
930 set_cache_mode(cache, CM_FAIL); in abort_transaction()
934 static void metadata_operation_failed(struct cache *cache, const char *op, int r) in metadata_operation_failed() argument
937 cache_device_name(cache), op, r); in metadata_operation_failed()
938 abort_transaction(cache); in metadata_operation_failed()
939 set_cache_mode(cache, CM_READ_ONLY); in metadata_operation_failed()
944 static void load_stats(struct cache *cache) in load_stats() argument
948 dm_cache_metadata_get_stats(cache->cmd, &stats); in load_stats()
949 atomic_set(&cache->stats.read_hit, stats.read_hits); in load_stats()
950 atomic_set(&cache->stats.read_miss, stats.read_misses); in load_stats()
951 atomic_set(&cache->stats.write_hit, stats.write_hits); in load_stats()
952 atomic_set(&cache->stats.write_miss, stats.write_misses); in load_stats()
955 static void save_stats(struct cache *cache) in save_stats() argument
959 if (get_cache_mode(cache) >= CM_READ_ONLY) in save_stats()
962 stats.read_hits = atomic_read(&cache->stats.read_hit); in save_stats()
963 stats.read_misses = atomic_read(&cache->stats.read_miss); in save_stats()
964 stats.write_hits = atomic_read(&cache->stats.write_hit); in save_stats()
965 stats.write_misses = atomic_read(&cache->stats.write_miss); in save_stats()
967 dm_cache_metadata_set_stats(cache->cmd, &stats); in save_stats()
991 * Migration covers moving data from the origin device to the cache, or
995 static void inc_io_migrations(struct cache *cache) in inc_io_migrations() argument
997 atomic_inc(&cache->nr_io_migrations); in inc_io_migrations()
1000 static void dec_io_migrations(struct cache *cache) in dec_io_migrations() argument
1002 atomic_dec(&cache->nr_io_migrations); in dec_io_migrations()
1010 static void calc_discard_block_range(struct cache *cache, struct bio *bio, in calc_discard_block_range() argument
1016 *b = to_dblock(dm_sector_div_up(sb, cache->discard_block_size)); in calc_discard_block_range()
1018 if (se - sb < cache->discard_block_size) in calc_discard_block_range()
1021 *e = to_dblock(block_div(se, cache->discard_block_size)); in calc_discard_block_range()
1026 static void prevent_background_work(struct cache *cache) in prevent_background_work() argument
1029 down_write(&cache->background_work_lock); in prevent_background_work()
1033 static void allow_background_work(struct cache *cache) in allow_background_work() argument
1036 up_write(&cache->background_work_lock); in allow_background_work()
1040 static bool background_work_begin(struct cache *cache) in background_work_begin() argument
1045 r = down_read_trylock(&cache->background_work_lock); in background_work_begin()
1051 static void background_work_end(struct cache *cache) in background_work_end() argument
1054 up_read(&cache->background_work_lock); in background_work_end()
1060 static bool bio_writes_complete_block(struct cache *cache, struct bio *bio) in bio_writes_complete_block() argument
1063 (bio->bi_iter.bi_size == (cache->sectors_per_block << SECTOR_SHIFT)); in bio_writes_complete_block()
1066 static bool optimisable_bio(struct cache *cache, struct bio *bio, dm_oblock_t block) in optimisable_bio() argument
1068 return writeback_mode(cache) && in optimisable_bio()
1069 (is_discarded_oblock(cache, block) || bio_writes_complete_block(cache, bio)); in optimisable_bio()
1076 dm_cell_quiesce_v2(mg->cache->prison, mg->cell, &mg->k.ws); in quiesce()
1093 queue_continuation(mg->cache->wq, &mg->k); in copy_complete()
1099 struct cache *cache = mg->cache; in copy() local
1101 o_region.bdev = cache->origin_dev->bdev; in copy()
1102 o_region.sector = from_oblock(mg->op->oblock) * cache->sectors_per_block; in copy()
1103 o_region.count = cache->sectors_per_block; in copy()
1105 c_region.bdev = cache->cache_dev->bdev; in copy()
1106 c_region.sector = from_cblock(mg->op->cblock) * cache->sectors_per_block; in copy()
1107 c_region.count = cache->sectors_per_block; in copy()
1110 dm_kcopyd_copy(cache->copier, &o_region, 1, &c_region, 0, copy_complete, &mg->k); in copy()
1112 dm_kcopyd_copy(cache->copier, &c_region, 1, &o_region, 0, copy_complete, &mg->k); in copy()
1115 static void bio_drop_shared_lock(struct cache *cache, struct bio *bio) in bio_drop_shared_lock() argument
1119 if (pb->cell && dm_cell_put_v2(cache->prison, pb->cell)) in bio_drop_shared_lock()
1120 free_prison_cell(cache, pb->cell); in bio_drop_shared_lock()
1127 struct cache *cache = mg->cache; in overwrite_endio() local
1135 queue_continuation(cache->wq, &mg->k); in overwrite_endio()
1151 remap_to_cache(mg->cache, bio, mg->op->cblock); in overwrite()
1153 remap_to_origin(mg->cache, bio); in overwrite()
1156 accounted_request(mg->cache, bio); in overwrite()
1173 struct cache *cache = mg->cache; in mg_complete() local
1178 update_stats(&cache->stats, op->op); in mg_complete()
1182 clear_discard(cache, oblock_to_dblock(cache, op->oblock)); in mg_complete()
1183 policy_complete_background_work(cache->policy, op, success); in mg_complete()
1187 force_set_dirty(cache, cblock); in mg_complete()
1195 force_clear_dirty(cache, cblock); in mg_complete()
1196 dec_io_migrations(cache); in mg_complete()
1205 force_clear_dirty(cache, cblock); in mg_complete()
1206 policy_complete_background_work(cache->policy, op, success); in mg_complete()
1207 dec_io_migrations(cache); in mg_complete()
1212 force_clear_dirty(cache, cblock); in mg_complete()
1213 policy_complete_background_work(cache->policy, op, success); in mg_complete()
1214 dec_io_migrations(cache); in mg_complete()
1220 if (dm_cell_unlock_v2(cache->prison, mg->cell, &bios)) in mg_complete()
1221 free_prison_cell(cache, mg->cell); in mg_complete()
1225 defer_bios(cache, &bios); in mg_complete()
1226 wake_migration_worker(cache); in mg_complete()
1228 background_work_end(cache); in mg_complete()
1242 struct cache *cache = mg->cache; in mg_update_metadata() local
1247 r = dm_cache_insert_mapping(cache->cmd, op->cblock, op->oblock); in mg_update_metadata()
1250 cache_device_name(cache)); in mg_update_metadata()
1251 metadata_operation_failed(cache, "dm_cache_insert_mapping", r); in mg_update_metadata()
1260 r = dm_cache_remove_mapping(cache->cmd, op->cblock); in mg_update_metadata()
1263 cache_device_name(cache)); in mg_update_metadata()
1264 metadata_operation_failed(cache, "dm_cache_remove_mapping", r); in mg_update_metadata()
1275 * - vblock x in a cache block in mg_update_metadata()
1277 * - cache block gets reallocated and over written in mg_update_metadata()
1280 * When we recover, because there was no commit the cache will in mg_update_metadata()
1281 * rollback to having the data for vblock x in the cache block. in mg_update_metadata()
1282 * But the cache block has since been overwritten, so it'll end in mg_update_metadata()
1290 continue_after_commit(&cache->committer, &mg->k); in mg_update_metadata()
1291 schedule_commit(&cache->committer); in mg_update_metadata()
1328 r = dm_cell_lock_promote_v2(mg->cache->prison, mg->cell, in mg_upgrade_lock()
1344 struct cache *cache = mg->cache; in mg_full_copy() local
1348 if ((!is_policy_promote && !is_dirty(cache, op->cblock)) || in mg_full_copy()
1349 is_discarded_oblock(cache, op->oblock)) { in mg_full_copy()
1368 if (!optimisable_bio(mg->cache, mg->overwrite_bio, mg->op->oblock)) { in mg_copy()
1372 bool rb = bio_detain_shared(mg->cache, mg->op->oblock, mg->overwrite_bio); in mg_copy()
1376 inc_io_migrations(mg->cache); in mg_copy()
1398 struct cache *cache = mg->cache; in mg_lock_writes() local
1401 prealloc = alloc_prison_cell(cache); in mg_lock_writes()
1409 r = dm_cell_lock_v2(cache->prison, &key, in mg_lock_writes()
1413 free_prison_cell(cache, prealloc); in mg_lock_writes()
1419 free_prison_cell(cache, prealloc); in mg_lock_writes()
1429 static int mg_start(struct cache *cache, struct policy_work *op, struct bio *bio) in mg_start() argument
1433 if (!background_work_begin(cache)) { in mg_start()
1434 policy_complete_background_work(cache->policy, op, false); in mg_start()
1438 mg = alloc_migration(cache); in mg_start()
1444 inc_io_migrations(cache); in mg_start()
1458 struct cache *cache = mg->cache; in invalidate_complete() local
1461 if (dm_cell_unlock_v2(cache->prison, mg->cell, &bios)) in invalidate_complete()
1462 free_prison_cell(cache, mg->cell); in invalidate_complete()
1468 defer_bios(cache, &bios); in invalidate_complete()
1470 background_work_end(cache); in invalidate_complete()
1480 static int invalidate_cblock(struct cache *cache, dm_cblock_t cblock) in invalidate_cblock() argument
1484 r = policy_invalidate_mapping(cache->policy, cblock); in invalidate_cblock()
1486 r = dm_cache_remove_mapping(cache->cmd, cblock); in invalidate_cblock()
1489 cache_device_name(cache)); in invalidate_cblock()
1490 metadata_operation_failed(cache, "dm_cache_remove_mapping", r); in invalidate_cblock()
1500 DMERR("%s: policy_invalidate_mapping failed", cache_device_name(cache)); in invalidate_cblock()
1509 struct cache *cache = mg->cache; in invalidate_remove() local
1511 r = invalidate_cblock(cache, mg->invalidate_cblock); in invalidate_remove()
1518 continue_after_commit(&cache->committer, &mg->k); in invalidate_remove()
1519 remap_to_origin_clear_discard(cache, mg->overwrite_bio, mg->invalidate_oblock); in invalidate_remove()
1521 schedule_commit(&cache->committer); in invalidate_remove()
1528 struct cache *cache = mg->cache; in invalidate_lock() local
1531 prealloc = alloc_prison_cell(cache); in invalidate_lock()
1534 r = dm_cell_lock_v2(cache->prison, &key, in invalidate_lock()
1537 free_prison_cell(cache, prealloc); in invalidate_lock()
1543 free_prison_cell(cache, prealloc); in invalidate_lock()
1554 queue_work(cache->wq, &mg->k.ws); in invalidate_lock()
1560 static int invalidate_start(struct cache *cache, dm_cblock_t cblock, in invalidate_start() argument
1565 if (!background_work_begin(cache)) in invalidate_start()
1568 mg = alloc_migration(cache); in invalidate_start()
1588 static enum busy spare_migration_bandwidth(struct cache *cache) in spare_migration_bandwidth() argument
1590 bool idle = dm_iot_idle_for(&cache->tracker, HZ); in spare_migration_bandwidth()
1591 sector_t current_volume = (atomic_read(&cache->nr_io_migrations) + 1) * in spare_migration_bandwidth()
1592 cache->sectors_per_block; in spare_migration_bandwidth()
1594 if (idle && current_volume <= cache->migration_threshold) in spare_migration_bandwidth()
1600 static void inc_hit_counter(struct cache *cache, struct bio *bio) in inc_hit_counter() argument
1603 &cache->stats.read_hit : &cache->stats.write_hit); in inc_hit_counter()
1606 static void inc_miss_counter(struct cache *cache, struct bio *bio) in inc_miss_counter() argument
1609 &cache->stats.read_miss : &cache->stats.write_miss); in inc_miss_counter()
1614 static int map_bio(struct cache *cache, struct bio *bio, dm_oblock_t block, in map_bio() argument
1623 rb = bio_detain_shared(cache, block, bio); in map_bio()
1637 if (optimisable_bio(cache, bio, block)) { in map_bio()
1640 r = policy_lookup_with_work(cache->policy, block, &cblock, data_dir, true, &op); in map_bio()
1643 cache_device_name(cache), r); in map_bio()
1649 bio_drop_shared_lock(cache, bio); in map_bio()
1651 mg_start(cache, op, bio); in map_bio()
1655 r = policy_lookup(cache->policy, block, &cblock, data_dir, false, &background_queued); in map_bio()
1658 cache_device_name(cache), r); in map_bio()
1664 wake_migration_worker(cache); in map_bio()
1673 inc_miss_counter(cache, bio); in map_bio()
1675 accounted_begin(cache, bio); in map_bio()
1676 remap_to_origin_clear_discard(cache, bio, block); in map_bio()
1689 inc_hit_counter(cache, bio); in map_bio()
1693 * cache blocks that are written to. in map_bio()
1695 if (passthrough_mode(cache)) { in map_bio()
1697 bio_drop_shared_lock(cache, bio); in map_bio()
1698 atomic_inc(&cache->stats.demotion); in map_bio()
1699 invalidate_start(cache, cblock, block, bio); in map_bio()
1701 remap_to_origin_clear_discard(cache, bio, block); in map_bio()
1703 if (bio_data_dir(bio) == WRITE && writethrough_mode(cache) && in map_bio()
1704 !is_dirty(cache, cblock)) { in map_bio()
1705 remap_to_origin_and_cache(cache, bio, block, cblock); in map_bio()
1706 accounted_begin(cache, bio); in map_bio()
1708 remap_to_cache_dirty(cache, bio, block, cblock); in map_bio()
1720 accounted_complete(cache, bio); in map_bio()
1721 issue_after_commit(&cache->committer, bio); in map_bio()
1729 static bool process_bio(struct cache *cache, struct bio *bio) in process_bio() argument
1733 if (map_bio(cache, bio, get_bio_block(cache, bio), &commit_needed) == DM_MAPIO_REMAPPED) in process_bio()
1742 static int commit(struct cache *cache, bool clean_shutdown) in commit() argument
1746 if (get_cache_mode(cache) >= CM_READ_ONLY) in commit()
1749 atomic_inc(&cache->stats.commit_count); in commit()
1750 r = dm_cache_commit(cache->cmd, clean_shutdown); in commit()
1752 metadata_operation_failed(cache, "dm_cache_commit", r); in commit()
1762 struct cache *cache = context; in commit_op() local
1764 if (dm_cache_changed_this_transaction(cache->cmd)) in commit_op()
1765 return errno_to_blk_status(commit(cache, false)); in commit_op()
1772 static bool process_flush_bio(struct cache *cache, struct bio *bio) in process_flush_bio() argument
1777 remap_to_origin(cache, bio); in process_flush_bio()
1779 remap_to_cache(cache, bio, 0); in process_flush_bio()
1781 issue_after_commit(&cache->committer, bio); in process_flush_bio()
1785 static bool process_discard_bio(struct cache *cache, struct bio *bio) in process_discard_bio() argument
1794 calc_discard_block_range(cache, bio, &b, &e); in process_discard_bio()
1796 set_discard(cache, b); in process_discard_bio()
1800 if (cache->features.discard_passdown) { in process_discard_bio()
1801 remap_to_origin(cache, bio); in process_discard_bio()
1811 struct cache *cache = container_of(ws, struct cache, deferred_bio_worker); in process_deferred_bios() local
1819 spin_lock_irq(&cache->lock); in process_deferred_bios()
1820 bio_list_merge(&bios, &cache->deferred_bios); in process_deferred_bios()
1821 bio_list_init(&cache->deferred_bios); in process_deferred_bios()
1822 spin_unlock_irq(&cache->lock); in process_deferred_bios()
1826 commit_needed = process_flush_bio(cache, bio) || commit_needed; in process_deferred_bios()
1829 commit_needed = process_discard_bio(cache, bio) || commit_needed; in process_deferred_bios()
1832 commit_needed = process_bio(cache, bio) || commit_needed; in process_deferred_bios()
1837 schedule_commit(&cache->committer); in process_deferred_bios()
1845 static void requeue_deferred_bios(struct cache *cache) in requeue_deferred_bios() argument
1851 bio_list_merge(&bios, &cache->deferred_bios); in requeue_deferred_bios()
1852 bio_list_init(&cache->deferred_bios); in requeue_deferred_bios()
1867 struct cache *cache = container_of(to_delayed_work(ws), struct cache, waker); in do_waker() local
1869 policy_tick(cache->policy, true); in do_waker()
1870 wake_migration_worker(cache); in do_waker()
1871 schedule_commit(&cache->committer); in do_waker()
1872 queue_delayed_work(cache->wq, &cache->waker, COMMIT_PERIOD); in do_waker()
1879 struct cache *cache = container_of(ws, struct cache, migration_worker); in check_migrations() local
1883 b = spare_migration_bandwidth(cache); in check_migrations()
1885 r = policy_get_background_work(cache->policy, b == IDLE, &op); in check_migrations()
1891 cache_device_name(cache)); in check_migrations()
1895 r = mg_start(cache, op, NULL); in check_migrations()
1913 static void __destroy(struct cache *cache) in __destroy() argument
1915 mempool_exit(&cache->migration_pool); in __destroy()
1917 if (cache->prison) in __destroy()
1918 dm_bio_prison_destroy_v2(cache->prison); in __destroy()
1920 if (cache->wq) in __destroy()
1921 destroy_workqueue(cache->wq); in __destroy()
1923 if (cache->dirty_bitset) in __destroy()
1924 free_bitset(cache->dirty_bitset); in __destroy()
1926 if (cache->discard_bitset) in __destroy()
1927 free_bitset(cache->discard_bitset); in __destroy()
1929 if (cache->copier) in __destroy()
1930 dm_kcopyd_client_destroy(cache->copier); in __destroy()
1932 if (cache->cmd) in __destroy()
1933 dm_cache_metadata_close(cache->cmd); in __destroy()
1935 if (cache->metadata_dev) in __destroy()
1936 dm_put_device(cache->ti, cache->metadata_dev); in __destroy()
1938 if (cache->origin_dev) in __destroy()
1939 dm_put_device(cache->ti, cache->origin_dev); in __destroy()
1941 if (cache->cache_dev) in __destroy()
1942 dm_put_device(cache->ti, cache->cache_dev); in __destroy()
1944 if (cache->policy) in __destroy()
1945 dm_cache_policy_destroy(cache->policy); in __destroy()
1947 bioset_exit(&cache->bs); in __destroy()
1949 kfree(cache); in __destroy()
1952 static void destroy(struct cache *cache) in destroy() argument
1956 cancel_delayed_work_sync(&cache->waker); in destroy()
1958 for (i = 0; i < cache->nr_ctr_args ; i++) in destroy()
1959 kfree(cache->ctr_args[i]); in destroy()
1960 kfree(cache->ctr_args); in destroy()
1962 __destroy(cache); in destroy()
1967 struct cache *cache = ti->private; in cache_dtr() local
1969 destroy(cache); in cache_dtr()
1980 * Construct a cache device mapping.
1982 * cache <metadata dev> <cache dev> <origin dev> <block size>
1987 * cache dev : fast device holding cached data blocks
1989 * block size : cache unit size in sectors
1999 * See cache-policies.txt for details.
2002 * writethrough : write through caching that prohibits cache block
2005 * back cache block contents later for performance reasons,
2086 *error = "Error opening cache device"; in parse_cache_dev()
2136 *error = "Data block size is larger than the cache device"; in parse_block_size()
2157 {0, 3, "Invalid number of cache feature arguments"}, in parse_features()
2196 *error = "Unrecognised cache feature requested"; in parse_features()
2202 *error = "Duplicate cache io_mode features requested"; in parse_features()
2275 static int process_config_option(struct cache *cache, const char *key, const char *value) in process_config_option() argument
2283 cache->migration_threshold = tmp; in process_config_option()
2290 static int set_config_value(struct cache *cache, const char *key, const char *value) in set_config_value() argument
2292 int r = process_config_option(cache, key, value); in set_config_value()
2295 r = policy_set_config_value(cache->policy, key, value); in set_config_value()
2303 static int set_config_values(struct cache *cache, int argc, const char **argv) in set_config_values() argument
2313 r = set_config_value(cache, argv[0], argv[1]); in set_config_values()
2324 static int create_cache_policy(struct cache *cache, struct cache_args *ca, in create_cache_policy() argument
2328 cache->cache_size, in create_cache_policy()
2329 cache->origin_sectors, in create_cache_policy()
2330 cache->sectors_per_block); in create_cache_policy()
2332 *error = "Error creating cache's policy"; in create_cache_policy()
2335 cache->policy = p; in create_cache_policy()
2336 BUG_ON(!cache->policy); in create_cache_policy()
2342 * We want the discard block size to be at least the size of the cache
2367 static void set_cache_size(struct cache *cache, dm_cblock_t size) in set_cache_size() argument
2371 if (nr_blocks > (1 << 20) && cache->cache_size != size) in set_cache_size()
2372 DMWARN_LIMIT("You have created a cache device with a lot of individual cache blocks (%llu)\n" in set_cache_size()
2374 "Please consider increasing the cache block size to reduce the overall cache block count.", in set_cache_size()
2377 cache->cache_size = size; in set_cache_size()
2382 static int cache_create(struct cache_args *ca, struct cache **result) in cache_create()
2386 struct cache *cache; in cache_create() local
2392 cache = kzalloc(sizeof(*cache), GFP_KERNEL); in cache_create()
2393 if (!cache) in cache_create()
2396 cache->ti = ca->ti; in cache_create()
2397 ti->private = cache; in cache_create()
2407 cache->features = ca->features; in cache_create()
2408 if (writethrough_mode(cache)) { in cache_create()
2410 r = bioset_init(&cache->bs, BIO_POOL_SIZE, 0, 0); in cache_create()
2415 cache->metadata_dev = ca->metadata_dev; in cache_create()
2416 cache->origin_dev = ca->origin_dev; in cache_create()
2417 cache->cache_dev = ca->cache_dev; in cache_create()
2421 origin_blocks = cache->origin_sectors = ti->len; in cache_create()
2423 cache->origin_blocks = to_oblock(origin_blocks); in cache_create()
2425 cache->sectors_per_block = ca->block_size; in cache_create()
2426 if (dm_set_target_max_io_len(ti, cache->sectors_per_block)) { in cache_create()
2434 cache->sectors_per_block_shift = -1; in cache_create()
2436 set_cache_size(cache, to_cblock(cache_size)); in cache_create()
2438 cache->sectors_per_block_shift = __ffs(ca->block_size); in cache_create()
2439 set_cache_size(cache, to_cblock(ca->cache_sectors >> cache->sectors_per_block_shift)); in cache_create()
2442 r = create_cache_policy(cache, ca, error); in cache_create()
2446 cache->policy_nr_args = ca->policy_argc; in cache_create()
2447 cache->migration_threshold = DEFAULT_MIGRATION_THRESHOLD; in cache_create()
2449 r = set_config_values(cache, ca->policy_argc, ca->policy_argv); in cache_create()
2451 *error = "Error setting cache policy's config values"; in cache_create()
2455 cmd = dm_cache_metadata_open(cache->metadata_dev->bdev, in cache_create()
2457 dm_cache_policy_get_hint_size(cache->policy), in cache_create()
2464 cache->cmd = cmd; in cache_create()
2465 set_cache_mode(cache, CM_WRITE); in cache_create()
2466 if (get_cache_mode(cache) != CM_WRITE) { in cache_create()
2472 if (passthrough_mode(cache)) { in cache_create()
2475 r = dm_cache_metadata_all_clean(cache->cmd, &all_clean); in cache_create()
2487 policy_allow_migrations(cache->policy, false); in cache_create()
2490 spin_lock_init(&cache->lock); in cache_create()
2491 bio_list_init(&cache->deferred_bios); in cache_create()
2492 atomic_set(&cache->nr_allocated_migrations, 0); in cache_create()
2493 atomic_set(&cache->nr_io_migrations, 0); in cache_create()
2494 init_waitqueue_head(&cache->migration_wait); in cache_create()
2497 atomic_set(&cache->nr_dirty, 0); in cache_create()
2498 cache->dirty_bitset = alloc_bitset(from_cblock(cache->cache_size)); in cache_create()
2499 if (!cache->dirty_bitset) { in cache_create()
2503 clear_bitset(cache->dirty_bitset, from_cblock(cache->cache_size)); in cache_create()
2505 cache->discard_block_size = in cache_create()
2506 calculate_discard_block_size(cache->sectors_per_block, in cache_create()
2507 cache->origin_sectors); in cache_create()
2508 cache->discard_nr_blocks = to_dblock(dm_sector_div_up(cache->origin_sectors, in cache_create()
2509 cache->discard_block_size)); in cache_create()
2510 cache->discard_bitset = alloc_bitset(from_dblock(cache->discard_nr_blocks)); in cache_create()
2511 if (!cache->discard_bitset) { in cache_create()
2515 clear_bitset(cache->discard_bitset, from_dblock(cache->discard_nr_blocks)); in cache_create()
2517 cache->copier = dm_kcopyd_client_create(&dm_kcopyd_throttle); in cache_create()
2518 if (IS_ERR(cache->copier)) { in cache_create()
2520 r = PTR_ERR(cache->copier); in cache_create()
2524 cache->wq = alloc_workqueue("dm-" DM_MSG_PREFIX, WQ_MEM_RECLAIM, 0); in cache_create()
2525 if (!cache->wq) { in cache_create()
2529 INIT_WORK(&cache->deferred_bio_worker, process_deferred_bios); in cache_create()
2530 INIT_WORK(&cache->migration_worker, check_migrations); in cache_create()
2531 INIT_DELAYED_WORK(&cache->waker, do_waker); in cache_create()
2533 cache->prison = dm_bio_prison_create_v2(cache->wq); in cache_create()
2534 if (!cache->prison) { in cache_create()
2539 r = mempool_init_slab_pool(&cache->migration_pool, MIGRATION_POOL_SIZE, in cache_create()
2542 *error = "Error creating cache's migration mempool"; in cache_create()
2546 cache->need_tick_bio = true; in cache_create()
2547 cache->sized = false; in cache_create()
2548 cache->invalidate = false; in cache_create()
2549 cache->commit_requested = false; in cache_create()
2550 cache->loaded_mappings = false; in cache_create()
2551 cache->loaded_discards = false; in cache_create()
2553 load_stats(cache); in cache_create()
2555 atomic_set(&cache->stats.demotion, 0); in cache_create()
2556 atomic_set(&cache->stats.promotion, 0); in cache_create()
2557 atomic_set(&cache->stats.copies_avoided, 0); in cache_create()
2558 atomic_set(&cache->stats.cache_cell_clash, 0); in cache_create()
2559 atomic_set(&cache->stats.commit_count, 0); in cache_create()
2560 atomic_set(&cache->stats.discard_count, 0); in cache_create()
2562 spin_lock_init(&cache->invalidation_lock); in cache_create()
2563 INIT_LIST_HEAD(&cache->invalidation_requests); in cache_create()
2565 batcher_init(&cache->committer, commit_op, cache, in cache_create()
2566 issue_op, cache, cache->wq); in cache_create()
2567 dm_iot_init(&cache->tracker); in cache_create()
2569 init_rwsem(&cache->background_work_lock); in cache_create()
2570 prevent_background_work(cache); in cache_create()
2572 *result = cache; in cache_create()
2575 __destroy(cache); in cache_create()
2579 static int copy_ctr_args(struct cache *cache, int argc, const char **argv) in copy_ctr_args() argument
2597 cache->nr_ctr_args = argc; in copy_ctr_args()
2598 cache->ctr_args = copy; in copy_ctr_args()
2607 struct cache *cache = NULL; in cache_ctr() local
2611 ti->error = "Error allocating memory for cache"; in cache_ctr()
2620 r = cache_create(ca, &cache); in cache_ctr()
2624 r = copy_ctr_args(cache, argc - 3, (const char **)argv + 3); in cache_ctr()
2626 __destroy(cache); in cache_ctr()
2630 ti->private = cache; in cache_ctr()
2640 struct cache *cache = ti->private; in cache_map() local
2644 dm_oblock_t block = get_bio_block(cache, bio); in cache_map()
2647 if (unlikely(from_oblock(block) >= from_oblock(cache->origin_blocks))) { in cache_map()
2650 * the end of the origin device. We don't cache these. in cache_map()
2653 remap_to_origin(cache, bio); in cache_map()
2654 accounted_begin(cache, bio); in cache_map()
2659 defer_bio(cache, bio); in cache_map()
2663 r = map_bio(cache, bio, block, &commit_needed); in cache_map()
2665 schedule_commit(&cache->committer); in cache_map()
2672 struct cache *cache = ti->private; in cache_end_io() local
2677 policy_tick(cache->policy, false); in cache_end_io()
2679 spin_lock_irqsave(&cache->lock, flags); in cache_end_io()
2680 cache->need_tick_bio = true; in cache_end_io()
2681 spin_unlock_irqrestore(&cache->lock, flags); in cache_end_io()
2684 bio_drop_shared_lock(cache, bio); in cache_end_io()
2685 accounted_complete(cache, bio); in cache_end_io()
2690 static int write_dirty_bitset(struct cache *cache) in write_dirty_bitset() argument
2694 if (get_cache_mode(cache) >= CM_READ_ONLY) in write_dirty_bitset()
2697 r = dm_cache_set_dirty_bits(cache->cmd, from_cblock(cache->cache_size), cache->dirty_bitset); in write_dirty_bitset()
2699 metadata_operation_failed(cache, "dm_cache_set_dirty_bits", r); in write_dirty_bitset()
2704 static int write_discard_bitset(struct cache *cache) in write_discard_bitset() argument
2708 if (get_cache_mode(cache) >= CM_READ_ONLY) in write_discard_bitset()
2711 r = dm_cache_discard_bitset_resize(cache->cmd, cache->discard_block_size, in write_discard_bitset()
2712 cache->discard_nr_blocks); in write_discard_bitset()
2714 DMERR("%s: could not resize on-disk discard bitset", cache_device_name(cache)); in write_discard_bitset()
2715 metadata_operation_failed(cache, "dm_cache_discard_bitset_resize", r); in write_discard_bitset()
2719 for (i = 0; i < from_dblock(cache->discard_nr_blocks); i++) { in write_discard_bitset()
2720 r = dm_cache_set_discard(cache->cmd, to_dblock(i), in write_discard_bitset()
2721 is_discarded(cache, to_dblock(i))); in write_discard_bitset()
2723 metadata_operation_failed(cache, "dm_cache_set_discard", r); in write_discard_bitset()
2731 static int write_hints(struct cache *cache) in write_hints() argument
2735 if (get_cache_mode(cache) >= CM_READ_ONLY) in write_hints()
2738 r = dm_cache_write_hints(cache->cmd, cache->policy); in write_hints()
2740 metadata_operation_failed(cache, "dm_cache_write_hints", r); in write_hints()
2750 static bool sync_metadata(struct cache *cache) in sync_metadata() argument
2754 r1 = write_dirty_bitset(cache); in sync_metadata()
2756 DMERR("%s: could not write dirty bitset", cache_device_name(cache)); in sync_metadata()
2758 r2 = write_discard_bitset(cache); in sync_metadata()
2760 DMERR("%s: could not write discard bitset", cache_device_name(cache)); in sync_metadata()
2762 save_stats(cache); in sync_metadata()
2764 r3 = write_hints(cache); in sync_metadata()
2766 DMERR("%s: could not write hints", cache_device_name(cache)); in sync_metadata()
2773 r4 = commit(cache, !r1 && !r2 && !r3); in sync_metadata()
2775 DMERR("%s: could not write cache metadata", cache_device_name(cache)); in sync_metadata()
2782 struct cache *cache = ti->private; in cache_postsuspend() local
2784 prevent_background_work(cache); in cache_postsuspend()
2785 BUG_ON(atomic_read(&cache->nr_io_migrations)); in cache_postsuspend()
2787 cancel_delayed_work_sync(&cache->waker); in cache_postsuspend()
2788 drain_workqueue(cache->wq); in cache_postsuspend()
2789 WARN_ON(cache->tracker.in_flight); in cache_postsuspend()
2795 requeue_deferred_bios(cache); in cache_postsuspend()
2797 if (get_cache_mode(cache) == CM_WRITE) in cache_postsuspend()
2798 (void) sync_metadata(cache); in cache_postsuspend()
2804 struct cache *cache = context; in load_mapping() local
2807 set_bit(from_cblock(cblock), cache->dirty_bitset); in load_mapping()
2808 atomic_inc(&cache->nr_dirty); in load_mapping()
2810 clear_bit(from_cblock(cblock), cache->dirty_bitset); in load_mapping()
2812 return policy_load_mapping(cache->policy, oblock, cblock, dirty, hint, hint_valid); in load_mapping()
2822 struct cache *cache; member
2832 static void discard_load_info_init(struct cache *cache, in discard_load_info_init() argument
2835 li->cache = cache; in discard_load_info_init()
2855 b = dm_sector_div_up(b, li->cache->discard_block_size); in set_discard_range()
2856 sector_div(e, li->cache->discard_block_size); in set_discard_range()
2862 if (e > from_dblock(li->cache->discard_nr_blocks)) in set_discard_range()
2863 e = from_dblock(li->cache->discard_nr_blocks); in set_discard_range()
2866 set_discard(li->cache, to_dblock(b)); in set_discard_range()
2899 static dm_cblock_t get_cache_dev_size(struct cache *cache) in get_cache_dev_size() argument
2901 sector_t size = get_dev_size(cache->cache_dev); in get_cache_dev_size()
2902 (void) sector_div(size, cache->sectors_per_block); in get_cache_dev_size()
2906 static bool can_resize(struct cache *cache, dm_cblock_t new_size) in can_resize() argument
2908 if (from_cblock(new_size) > from_cblock(cache->cache_size)) { in can_resize()
2909 DMERR("%s: unable to extend cache due to missing cache table reload", in can_resize()
2910 cache_device_name(cache)); in can_resize()
2915 * We can't drop a dirty block when shrinking the cache. in can_resize()
2917 if (cache->loaded_mappings) { in can_resize()
2918 new_size = to_cblock(find_next_bit(cache->dirty_bitset, in can_resize()
2919 from_cblock(cache->cache_size), in can_resize()
2921 if (new_size != cache->cache_size) { in can_resize()
2922 DMERR("%s: unable to shrink cache; cache block %llu is dirty", in can_resize()
2923 cache_device_name(cache), in can_resize()
2932 static int resize_cache_dev(struct cache *cache, dm_cblock_t new_size) in resize_cache_dev() argument
2936 r = dm_cache_resize(cache->cmd, new_size); in resize_cache_dev()
2938 DMERR("%s: could not resize cache metadata", cache_device_name(cache)); in resize_cache_dev()
2939 metadata_operation_failed(cache, "dm_cache_resize", r); in resize_cache_dev()
2943 set_cache_size(cache, new_size); in resize_cache_dev()
2951 struct cache *cache = ti->private; in cache_preresume() local
2952 dm_cblock_t csize = get_cache_dev_size(cache); in cache_preresume()
2955 * Check to see if the cache has resized. in cache_preresume()
2957 if (!cache->sized || csize != cache->cache_size) { in cache_preresume()
2958 if (!can_resize(cache, csize)) in cache_preresume()
2961 r = resize_cache_dev(cache, csize); in cache_preresume()
2965 cache->sized = true; in cache_preresume()
2968 if (!cache->loaded_mappings) { in cache_preresume()
2969 r = dm_cache_load_mappings(cache->cmd, cache->policy, in cache_preresume()
2970 load_mapping, cache); in cache_preresume()
2972 DMERR("%s: could not load cache mappings", cache_device_name(cache)); in cache_preresume()
2973 metadata_operation_failed(cache, "dm_cache_load_mappings", r); in cache_preresume()
2977 cache->loaded_mappings = true; in cache_preresume()
2980 if (!cache->loaded_discards) { in cache_preresume()
2988 clear_bitset(cache->discard_bitset, from_dblock(cache->discard_nr_blocks)); in cache_preresume()
2990 discard_load_info_init(cache, &li); in cache_preresume()
2991 r = dm_cache_load_discards(cache->cmd, load_discard, &li); in cache_preresume()
2993 DMERR("%s: could not load origin discards", cache_device_name(cache)); in cache_preresume()
2994 metadata_operation_failed(cache, "dm_cache_load_discards", r); in cache_preresume()
2999 cache->loaded_discards = true; in cache_preresume()
3007 struct cache *cache = ti->private; in cache_resume() local
3009 cache->need_tick_bio = true; in cache_resume()
3010 allow_background_work(cache); in cache_resume()
3011 do_waker(&cache->waker.work); in cache_resume()
3014 static void emit_flags(struct cache *cache, char *result, in emit_flags() argument
3018 struct cache_features *cf = &cache->features; in emit_flags()
3026 if (writethrough_mode(cache)) in emit_flags()
3029 else if (passthrough_mode(cache)) in emit_flags()
3032 else if (writeback_mode(cache)) in emit_flags()
3038 cache_device_name(cache), (int) cf->io_mode); in emit_flags()
3051 * <cache block size> <#used cache blocks>/<#total cache blocks>
3056 * <policy name> <#policy args> <policy args>* <cache metadata mode> <needs_check>
3067 struct cache *cache = ti->private; in cache_status() local
3073 if (get_cache_mode(cache) == CM_FAIL) { in cache_status()
3080 (void) commit(cache, false); in cache_status()
3082 r = dm_cache_get_free_metadata_block_count(cache->cmd, &nr_free_blocks_metadata); in cache_status()
3085 cache_device_name(cache), r); in cache_status()
3089 r = dm_cache_get_metadata_dev_size(cache->cmd, &nr_blocks_metadata); in cache_status()
3092 cache_device_name(cache), r); in cache_status()
3096 residency = policy_residency(cache->policy); in cache_status()
3102 (unsigned long long)cache->sectors_per_block, in cache_status()
3104 (unsigned long long) from_cblock(cache->cache_size), in cache_status()
3105 (unsigned int) atomic_read(&cache->stats.read_hit), in cache_status()
3106 (unsigned int) atomic_read(&cache->stats.read_miss), in cache_status()
3107 (unsigned int) atomic_read(&cache->stats.write_hit), in cache_status()
3108 (unsigned int) atomic_read(&cache->stats.write_miss), in cache_status()
3109 (unsigned int) atomic_read(&cache->stats.demotion), in cache_status()
3110 (unsigned int) atomic_read(&cache->stats.promotion), in cache_status()
3111 (unsigned long) atomic_read(&cache->nr_dirty)); in cache_status()
3113 emit_flags(cache, result, maxlen, &sz); in cache_status()
3115 DMEMIT("2 migration_threshold %llu ", (unsigned long long) cache->migration_threshold); in cache_status()
3117 DMEMIT("%s ", dm_cache_policy_get_name(cache->policy)); in cache_status()
3119 r = policy_emit_config_values(cache->policy, result, maxlen, &sz); in cache_status()
3122 cache_device_name(cache), r); in cache_status()
3125 if (get_cache_mode(cache) == CM_READ_ONLY) in cache_status()
3130 r = dm_cache_metadata_needs_check(cache->cmd, &needs_check); in cache_status()
3140 format_dev_t(buf, cache->metadata_dev->bdev->bd_dev); in cache_status()
3142 format_dev_t(buf, cache->cache_dev->bdev->bd_dev); in cache_status()
3144 format_dev_t(buf, cache->origin_dev->bdev->bd_dev); in cache_status()
3147 for (i = 0; i < cache->nr_ctr_args - 1; i++) in cache_status()
3148 DMEMIT(" %s", cache->ctr_args[i]); in cache_status()
3149 if (cache->nr_ctr_args) in cache_status()
3150 DMEMIT(" %s", cache->ctr_args[cache->nr_ctr_args - 1]); in cache_status()
3155 if (get_cache_mode(cache) == CM_FAIL) in cache_status()
3157 else if (get_cache_mode(cache) == CM_READ_ONLY) in cache_status()
3162 format_dev_t(buf, cache->metadata_dev->bdev->bd_dev); in cache_status()
3164 format_dev_t(buf, cache->cache_dev->bdev->bd_dev); in cache_status()
3166 format_dev_t(buf, cache->origin_dev->bdev->bd_dev); in cache_status()
3168 DMEMIT(",writethrough=%c", writethrough_mode(cache) ? 'y' : 'n'); in cache_status()
3169 DMEMIT(",writeback=%c", writeback_mode(cache) ? 'y' : 'n'); in cache_status()
3170 DMEMIT(",passthrough=%c", passthrough_mode(cache) ? 'y' : 'n'); in cache_status()
3171 DMEMIT(",metadata2=%c", cache->features.metadata_version == 2 ? 'y' : 'n'); in cache_status()
3172 DMEMIT(",no_discard_passdown=%c", cache->features.discard_passdown ? 'n' : 'y'); in cache_status()
3193 * A cache block range can take two forms:
3198 static int parse_cblock_range(struct cache *cache, const char *str, in parse_cblock_range() argument
3231 DMERR("%s: invalid cblock range '%s'", cache_device_name(cache), str); in parse_cblock_range()
3235 static int validate_cblock_range(struct cache *cache, struct cblock_range *range) in validate_cblock_range() argument
3239 uint64_t n = from_cblock(cache->cache_size); in validate_cblock_range()
3243 cache_device_name(cache), b, n); in validate_cblock_range()
3249 cache_device_name(cache), e, n); in validate_cblock_range()
3255 cache_device_name(cache), b, e); in validate_cblock_range()
3267 static int request_invalidation(struct cache *cache, struct cblock_range *range) in request_invalidation() argument
3278 r = invalidate_cblock(cache, range->begin); in request_invalidation()
3285 cache->commit_requested = true; in request_invalidation()
3289 static int process_invalidate_cblocks_message(struct cache *cache, unsigned int count, in process_invalidate_cblocks_message() argument
3296 if (!passthrough_mode(cache)) { in process_invalidate_cblocks_message()
3297 DMERR("%s: cache has to be in passthrough mode for invalidation", in process_invalidate_cblocks_message()
3298 cache_device_name(cache)); in process_invalidate_cblocks_message()
3303 r = parse_cblock_range(cache, cblock_ranges[i], &range); in process_invalidate_cblocks_message()
3307 r = validate_cblock_range(cache, &range); in process_invalidate_cblocks_message()
3314 r = request_invalidation(cache, &range); in process_invalidate_cblocks_message()
3328 * The key migration_threshold is supported by the cache target core.
3333 struct cache *cache = ti->private; in cache_message() local
3338 if (get_cache_mode(cache) >= CM_READ_ONLY) { in cache_message()
3339 DMERR("%s: unable to service cache target messages in READ_ONLY or FAIL mode", in cache_message()
3340 cache_device_name(cache)); in cache_message()
3345 return process_invalidate_cblocks_message(cache, argc - 1, (const char **) argv + 1); in cache_message()
3350 return set_config_value(cache, argv[0], argv[1]); in cache_message()
3357 struct cache *cache = ti->private; in cache_iterate_devices() local
3359 r = fn(ti, cache->cache_dev, 0, get_dev_size(cache->cache_dev), data); in cache_iterate_devices()
3361 r = fn(ti, cache->origin_dev, 0, ti->len, data); in cache_iterate_devices()
3370 static void disable_passdown_if_not_supported(struct cache *cache) in disable_passdown_if_not_supported() argument
3372 struct block_device *origin_bdev = cache->origin_dev->bdev; in disable_passdown_if_not_supported()
3376 if (!cache->features.discard_passdown) in disable_passdown_if_not_supported()
3382 else if (origin_limits->max_discard_sectors < cache->sectors_per_block) in disable_passdown_if_not_supported()
3388 cache->features.discard_passdown = false; in disable_passdown_if_not_supported()
3392 static void set_discard_limits(struct cache *cache, struct queue_limits *limits) in set_discard_limits() argument
3394 struct block_device *origin_bdev = cache->origin_dev->bdev; in set_discard_limits()
3397 if (!cache->features.discard_passdown) { in set_discard_limits()
3399 limits->max_discard_sectors = min_t(sector_t, cache->discard_block_size * 1024, in set_discard_limits()
3400 cache->origin_sectors); in set_discard_limits()
3401 limits->discard_granularity = cache->discard_block_size << SECTOR_SHIFT; in set_discard_limits()
3418 struct cache *cache = ti->private; in cache_io_hints() local
3423 * cache's blocksize (io_opt is a factor) do not override them. in cache_io_hints()
3425 if (io_opt_sectors < cache->sectors_per_block || in cache_io_hints()
3426 do_div(io_opt_sectors, cache->sectors_per_block)) { in cache_io_hints()
3427 blk_limits_io_min(limits, cache->sectors_per_block << SECTOR_SHIFT); in cache_io_hints()
3428 blk_limits_io_opt(limits, cache->sectors_per_block << SECTOR_SHIFT); in cache_io_hints()
3431 disable_passdown_if_not_supported(cache); in cache_io_hints()
3432 set_discard_limits(cache, limits); in cache_io_hints()
3438 .name = "cache",
3494 MODULE_DESCRIPTION(DM_NAME " cache target");