Lines Matching full:clone
33 #include "dm-clone-metadata.h"
35 #define DM_MSG_PREFIX "clone"
60 /* dm-clone metadata modes */
69 struct clone { struct
141 * dm-clone flags argument
152 static enum clone_metadata_mode get_clone_mode(struct clone *clone) in get_clone_mode() argument
154 return READ_ONCE(clone->mode); in get_clone_mode()
157 static const char *clone_device_name(struct clone *clone) in clone_device_name() argument
159 return dm_table_device_name(clone->ti->table); in clone_device_name()
162 static void __set_clone_mode(struct clone *clone, enum clone_metadata_mode new_mode) in __set_clone_mode() argument
170 enum clone_metadata_mode old_mode = get_clone_mode(clone); in __set_clone_mode()
179 dm_clone_metadata_set_read_only(clone->cmd); in __set_clone_mode()
183 dm_clone_metadata_set_read_write(clone->cmd); in __set_clone_mode()
187 WRITE_ONCE(clone->mode, new_mode); in __set_clone_mode()
190 dm_table_event(clone->ti->table); in __set_clone_mode()
191 DMINFO("%s: Switching to %s mode", clone_device_name(clone), in __set_clone_mode()
196 static void __abort_transaction(struct clone *clone) in __abort_transaction() argument
198 const char *dev_name = clone_device_name(clone); in __abort_transaction()
200 if (get_clone_mode(clone) >= CM_READ_ONLY) in __abort_transaction()
204 if (dm_clone_metadata_abort(clone->cmd)) { in __abort_transaction()
206 __set_clone_mode(clone, CM_FAIL); in __abort_transaction()
210 static void __reload_in_core_bitset(struct clone *clone) in __reload_in_core_bitset() argument
212 const char *dev_name = clone_device_name(clone); in __reload_in_core_bitset()
214 if (get_clone_mode(clone) == CM_FAIL) in __reload_in_core_bitset()
219 if (dm_clone_reload_in_core_bitset(clone->cmd)) { in __reload_in_core_bitset()
221 __set_clone_mode(clone, CM_FAIL); in __reload_in_core_bitset()
225 static void __metadata_operation_failed(struct clone *clone, const char *op, int r) in __metadata_operation_failed() argument
228 clone_device_name(clone), op, r); in __metadata_operation_failed()
230 __abort_transaction(clone); in __metadata_operation_failed()
231 __set_clone_mode(clone, CM_READ_ONLY); in __metadata_operation_failed()
238 __reload_in_core_bitset(clone); in __metadata_operation_failed()
244 static inline void wakeup_hydration_waiters(struct clone *clone) in wakeup_hydration_waiters() argument
246 wake_up_all(&clone->hydration_stopped); in wakeup_hydration_waiters()
249 static inline void wake_worker(struct clone *clone) in wake_worker() argument
251 queue_work(clone->wq, &clone->worker); in wake_worker()
259 static inline void remap_to_source(struct clone *clone, struct bio *bio) in remap_to_source() argument
261 bio_set_dev(bio, clone->source_dev->bdev); in remap_to_source()
264 static inline void remap_to_dest(struct clone *clone, struct bio *bio) in remap_to_dest() argument
266 bio_set_dev(bio, clone->dest_dev->bdev); in remap_to_dest()
269 static bool bio_triggers_commit(struct clone *clone, struct bio *bio) in bio_triggers_commit() argument
272 dm_clone_changed_this_transaction(clone->cmd); in bio_triggers_commit()
276 static inline sector_t region_to_sector(struct clone *clone, unsigned long region_nr) in region_to_sector() argument
278 return ((sector_t)region_nr << clone->region_shift); in region_to_sector()
282 static inline unsigned long bio_to_region(struct clone *clone, struct bio *bio) in bio_to_region() argument
284 return (bio->bi_iter.bi_sector >> clone->region_shift); in bio_to_region()
288 static void bio_region_range(struct clone *clone, struct bio *bio, in bio_region_range() argument
293 *rs = dm_sector_div_up(bio->bi_iter.bi_sector, clone->region_size); in bio_region_range()
294 end = bio_end_sector(bio) >> clone->region_shift; in bio_region_range()
303 static inline bool is_overwrite_bio(struct clone *clone, struct bio *bio) in is_overwrite_bio() argument
305 return (bio_data_dir(bio) == WRITE && bio_sectors(bio) == clone->region_size); in is_overwrite_bio()
339 static void issue_bio(struct clone *clone, struct bio *bio) in issue_bio() argument
341 if (!bio_triggers_commit(clone, bio)) { in issue_bio()
350 if (unlikely(get_clone_mode(clone) >= CM_READ_ONLY)) { in issue_bio()
359 spin_lock_irq(&clone->lock); in issue_bio()
360 bio_list_add(&clone->deferred_flush_bios, bio); in issue_bio()
361 spin_unlock_irq(&clone->lock); in issue_bio()
363 wake_worker(clone); in issue_bio()
372 static void remap_and_issue(struct clone *clone, struct bio *bio) in remap_and_issue() argument
374 remap_to_dest(clone, bio); in remap_and_issue()
375 issue_bio(clone, bio); in remap_and_issue()
385 static void issue_deferred_bios(struct clone *clone, struct bio_list *bios) in issue_deferred_bios() argument
396 if (bio_triggers_commit(clone, bio)) in issue_deferred_bios()
402 spin_lock_irqsave(&clone->lock, flags); in issue_deferred_bios()
403 bio_list_merge(&clone->deferred_bios, &normal_bios); in issue_deferred_bios()
404 bio_list_merge(&clone->deferred_flush_bios, &flush_bios); in issue_deferred_bios()
405 spin_unlock_irqrestore(&clone->lock, flags); in issue_deferred_bios()
407 wake_worker(clone); in issue_deferred_bios()
410 static void complete_overwrite_bio(struct clone *clone, struct bio *bio) in complete_overwrite_bio() argument
433 if (unlikely(get_clone_mode(clone) >= CM_READ_ONLY)) { in complete_overwrite_bio()
442 spin_lock_irqsave(&clone->lock, flags); in complete_overwrite_bio()
443 bio_list_add(&clone->deferred_flush_completions, bio); in complete_overwrite_bio()
444 spin_unlock_irqrestore(&clone->lock, flags); in complete_overwrite_bio()
446 wake_worker(clone); in complete_overwrite_bio()
455 static void complete_discard_bio(struct clone *clone, struct bio *bio, bool success) in complete_discard_bio() argument
464 if (test_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags) && success) { in complete_discard_bio()
465 remap_to_dest(clone, bio); in complete_discard_bio()
466 bio_region_range(clone, bio, &rs, &nr_regions); in complete_discard_bio()
467 trim_bio(bio, region_to_sector(clone, rs), in complete_discard_bio()
468 nr_regions << clone->region_shift); in complete_discard_bio()
474 static void process_discard_bio(struct clone *clone, struct bio *bio) in process_discard_bio() argument
478 bio_region_range(clone, bio, &rs, &nr_regions); in process_discard_bio()
484 if (WARN_ON(rs >= clone->nr_regions || (rs + nr_regions) < rs || in process_discard_bio()
485 (rs + nr_regions) > clone->nr_regions)) { in process_discard_bio()
487 clone_device_name(clone), rs, nr_regions, in process_discard_bio()
488 clone->nr_regions, in process_discard_bio()
499 if (dm_clone_is_range_hydrated(clone->cmd, rs, nr_regions)) { in process_discard_bio()
500 complete_discard_bio(clone, bio, true); in process_discard_bio()
509 if (unlikely(get_clone_mode(clone) >= CM_READ_ONLY)) { in process_discard_bio()
517 spin_lock_irq(&clone->lock); in process_discard_bio()
518 bio_list_add(&clone->deferred_discard_bios, bio); in process_discard_bio()
519 spin_unlock_irq(&clone->lock); in process_discard_bio()
521 wake_worker(clone); in process_discard_bio()
527 * dm-clone region hydrations.
530 struct clone *clone; member
576 static int hash_table_init(struct clone *clone) in hash_table_init() argument
583 clone->ht = kvmalloc_array(sz, sizeof(struct hash_table_bucket), GFP_KERNEL); in hash_table_init()
584 if (!clone->ht) in hash_table_init()
588 bucket = clone->ht + i; in hash_table_init()
597 static void hash_table_exit(struct clone *clone) in hash_table_exit() argument
599 kvfree(clone->ht); in hash_table_exit()
602 static struct hash_table_bucket *get_hash_table_bucket(struct clone *clone, in get_hash_table_bucket() argument
605 return &clone->ht[hash_long(region_nr, HASH_TABLE_BITS)]; in get_hash_table_bucket()
662 static struct dm_clone_region_hydration *alloc_hydration(struct clone *clone) in alloc_hydration() argument
670 hd = mempool_alloc(&clone->hydration_pool, GFP_NOIO); in alloc_hydration()
671 hd->clone = clone; in alloc_hydration()
678 mempool_free(hd, &hd->clone->hydration_pool); in free_hydration()
696 * Update dm-clone's metadata after a region has finished hydrating and remove
704 struct clone *clone = hd->clone; in hydration_update_metadata() local
706 if (unlikely(get_clone_mode(clone) >= CM_READ_ONLY)) in hydration_update_metadata()
711 r = dm_clone_set_region_hydrated(clone->cmd, hd->region_nr); in hydration_update_metadata()
713 bucket = get_hash_table_bucket(clone, hd->region_nr); in hydration_update_metadata()
726 * 1. Update dm-clone's metadata.
737 struct clone *clone = hd->clone; in hydration_complete() local
743 complete_overwrite_bio(clone, hd->overwrite_bio); in hydration_complete()
745 issue_deferred_bios(clone, &hd->deferred_bios); in hydration_complete()
757 if (atomic_dec_and_test(&clone->hydrations_in_flight)) in hydration_complete()
758 wakeup_hydration_waiters(clone); in hydration_complete()
766 struct clone *clone = hd->clone; in hydration_kcopyd_callback() local
771 DMERR_LIMIT("%s: hydration failed", clone_device_name(clone)); in hydration_kcopyd_callback()
788 if (test_bit(DM_CLONE_HYDRATION_ENABLED, &clone->flags) && in hydration_kcopyd_callback()
789 !atomic_read(&clone->ios_in_flight)) in hydration_kcopyd_callback()
790 wake_worker(clone); in hydration_kcopyd_callback()
798 struct clone *clone = hd->clone; in hydration_copy() local
803 region_size = clone->region_size; in hydration_copy()
807 total_size = region_to_sector(clone, nr_regions - 1); in hydration_copy()
809 if (region_end == clone->nr_regions - 1) { in hydration_copy()
814 tail_size = clone->ti->len & (region_size - 1); in hydration_copy()
823 from.bdev = clone->source_dev->bdev; in hydration_copy()
824 from.sector = region_to_sector(clone, region_start); in hydration_copy()
827 to.bdev = clone->dest_dev->bdev; in hydration_copy()
832 atomic_add(nr_regions, &clone->hydrations_in_flight); in hydration_copy()
833 dm_kcopyd_copy(clone->kcopyd_client, &from, 1, &to, 0, in hydration_copy()
860 atomic_inc(&hd->clone->hydrations_in_flight); in hydration_overwrite()
874 static void hydrate_bio_region(struct clone *clone, struct bio *bio) in hydrate_bio_region() argument
880 region_nr = bio_to_region(clone, bio); in hydrate_bio_region()
881 bucket = get_hash_table_bucket(clone, region_nr); in hydrate_bio_region()
893 if (dm_clone_is_region_hydrated(clone->cmd, region_nr)) { in hydrate_bio_region()
896 issue_bio(clone, bio); in hydrate_bio_region()
906 hd = alloc_hydration(clone); in hydrate_bio_region()
912 if (dm_clone_is_region_hydrated(clone->cmd, region_nr)) { in hydrate_bio_region()
915 issue_bio(clone, bio); in hydrate_bio_region()
933 if (unlikely(get_clone_mode(clone) >= CM_READ_ONLY)) { in hydrate_bio_region()
948 if (is_overwrite_bio(clone, bio)) { in hydrate_bio_region()
981 struct clone *clone = hd->clone; in __batch_hydration() local
982 unsigned int max_batch_size = READ_ONCE(clone->hydration_batch_size); in __batch_hydration()
1016 static unsigned long __start_next_hydration(struct clone *clone, in __start_next_hydration() argument
1022 unsigned long nr_regions = clone->nr_regions; in __start_next_hydration()
1024 hd = alloc_hydration(clone); in __start_next_hydration()
1028 offset = dm_clone_find_next_unhydrated_region(clone->cmd, offset); in __start_next_hydration()
1032 bucket = get_hash_table_bucket(clone, offset); in __start_next_hydration()
1035 if (!dm_clone_is_region_hydrated(clone->cmd, offset) && in __start_next_hydration()
1061 static void do_hydration(struct clone *clone) in do_hydration() argument
1064 unsigned long offset, nr_regions = clone->nr_regions; in do_hydration()
1071 if (unlikely(get_clone_mode(clone) >= CM_READ_ONLY)) in do_hydration()
1074 if (dm_clone_is_hydration_done(clone->cmd)) in do_hydration()
1080 atomic_inc(&clone->hydrations_in_flight); in do_hydration()
1092 offset = clone->hydration_offset; in do_hydration()
1093 while (likely(!test_bit(DM_CLONE_HYDRATION_SUSPENDED, &clone->flags)) && in do_hydration()
1094 !atomic_read(&clone->ios_in_flight) && in do_hydration()
1095 test_bit(DM_CLONE_HYDRATION_ENABLED, &clone->flags) && in do_hydration()
1097 current_volume = atomic_read(&clone->hydrations_in_flight); in do_hydration()
1100 if (current_volume > READ_ONCE(clone->hydration_threshold)) in do_hydration()
1103 offset = __start_next_hydration(clone, offset, &batch); in do_hydration()
1112 clone->hydration_offset = offset; in do_hydration()
1114 if (atomic_dec_and_test(&clone->hydrations_in_flight)) in do_hydration()
1115 wakeup_hydration_waiters(clone); in do_hydration()
1120 static bool need_commit_due_to_time(struct clone *clone) in need_commit_due_to_time() argument
1122 return !time_in_range(jiffies, clone->last_commit_jiffies, in need_commit_due_to_time()
1123 clone->last_commit_jiffies + COMMIT_PERIOD); in need_commit_due_to_time()
1129 static int commit_metadata(struct clone *clone, bool *dest_dev_flushed) in commit_metadata() argument
1136 mutex_lock(&clone->commit_lock); in commit_metadata()
1138 if (!dm_clone_changed_this_transaction(clone->cmd)) in commit_metadata()
1141 if (unlikely(get_clone_mode(clone) >= CM_READ_ONLY)) { in commit_metadata()
1146 r = dm_clone_metadata_pre_commit(clone->cmd); in commit_metadata()
1148 __metadata_operation_failed(clone, "dm_clone_metadata_pre_commit", r); in commit_metadata()
1152 r = blkdev_issue_flush(clone->dest_dev->bdev); in commit_metadata()
1154 __metadata_operation_failed(clone, "flush destination device", r); in commit_metadata()
1161 r = dm_clone_metadata_commit(clone->cmd); in commit_metadata()
1163 __metadata_operation_failed(clone, "dm_clone_metadata_commit", r); in commit_metadata()
1167 if (dm_clone_is_hydration_done(clone->cmd)) in commit_metadata()
1168 dm_table_event(clone->ti->table); in commit_metadata()
1170 mutex_unlock(&clone->commit_lock); in commit_metadata()
1175 static void process_deferred_discards(struct clone *clone) in process_deferred_discards() argument
1183 spin_lock_irq(&clone->lock); in process_deferred_discards()
1184 bio_list_merge(&discards, &clone->deferred_discard_bios); in process_deferred_discards()
1185 bio_list_init(&clone->deferred_discard_bios); in process_deferred_discards()
1186 spin_unlock_irq(&clone->lock); in process_deferred_discards()
1191 if (unlikely(get_clone_mode(clone) >= CM_READ_ONLY)) in process_deferred_discards()
1196 bio_region_range(clone, bio, &rs, &nr_regions); in process_deferred_discards()
1202 r = dm_clone_cond_set_range(clone->cmd, rs, nr_regions); in process_deferred_discards()
1209 complete_discard_bio(clone, bio, r == 0); in process_deferred_discards()
1213 static void process_deferred_bios(struct clone *clone) in process_deferred_bios() argument
1217 spin_lock_irq(&clone->lock); in process_deferred_bios()
1218 bio_list_merge(&bios, &clone->deferred_bios); in process_deferred_bios()
1219 bio_list_init(&clone->deferred_bios); in process_deferred_bios()
1220 spin_unlock_irq(&clone->lock); in process_deferred_bios()
1228 static void process_deferred_flush_bios(struct clone *clone) in process_deferred_flush_bios() argument
1239 spin_lock_irq(&clone->lock); in process_deferred_flush_bios()
1240 bio_list_merge(&bios, &clone->deferred_flush_bios); in process_deferred_flush_bios()
1241 bio_list_init(&clone->deferred_flush_bios); in process_deferred_flush_bios()
1243 bio_list_merge(&bio_completions, &clone->deferred_flush_completions); in process_deferred_flush_bios()
1244 bio_list_init(&clone->deferred_flush_completions); in process_deferred_flush_bios()
1245 spin_unlock_irq(&clone->lock); in process_deferred_flush_bios()
1248 !(dm_clone_changed_this_transaction(clone->cmd) && need_commit_due_to_time(clone))) in process_deferred_flush_bios()
1251 if (commit_metadata(clone, &dest_dev_flushed)) { in process_deferred_flush_bios()
1260 clone->last_commit_jiffies = jiffies; in process_deferred_flush_bios()
1280 struct clone *clone = container_of(work, typeof(*clone), worker); in do_worker() local
1282 process_deferred_bios(clone); in do_worker()
1283 process_deferred_discards(clone); in do_worker()
1294 process_deferred_flush_bios(clone); in do_worker()
1297 do_hydration(clone); in do_worker()
1307 struct clone *clone = container_of(to_delayed_work(work), struct clone, waker); in do_waker() local
1309 wake_worker(clone); in do_waker()
1310 queue_delayed_work(clone->wq, &clone->waker, COMMIT_PERIOD); in do_waker()
1320 struct clone *clone = ti->private; in clone_map() local
1323 atomic_inc(&clone->ios_in_flight); in clone_map()
1325 if (unlikely(get_clone_mode(clone) == CM_FAIL)) in clone_map()
1336 remap_and_issue(clone, bio); in clone_map()
1343 * dm-clone interprets discards and performs a fast hydration of the in clone_map()
1348 process_discard_bio(clone, bio); in clone_map()
1362 region_nr = bio_to_region(clone, bio); in clone_map()
1363 if (dm_clone_is_region_hydrated(clone->cmd, region_nr)) { in clone_map()
1364 remap_and_issue(clone, bio); in clone_map()
1367 remap_to_source(clone, bio); in clone_map()
1371 remap_to_dest(clone, bio); in clone_map()
1372 hydrate_bio_region(clone, bio); in clone_map()
1379 struct clone *clone = ti->private; in clone_endio() local
1381 atomic_dec(&clone->ios_in_flight); in clone_endio()
1386 static void emit_flags(struct clone *clone, char *result, unsigned int maxlen, in emit_flags() argument
1392 count = !test_bit(DM_CLONE_HYDRATION_ENABLED, &clone->flags); in emit_flags()
1393 count += !test_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags); in emit_flags()
1397 if (!test_bit(DM_CLONE_HYDRATION_ENABLED, &clone->flags)) in emit_flags()
1400 if (!test_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags)) in emit_flags()
1406 static void emit_core_args(struct clone *clone, char *result, in emit_core_args() argument
1413 READ_ONCE(clone->hydration_threshold), in emit_core_args()
1414 READ_ONCE(clone->hydration_batch_size)); in emit_core_args()
1423 * <clone region size> <#hydrated regions>/<#total regions> <#hydrating regions>
1424 * <#features> <features>* <#core args> <core args>* <clone metadata mode>
1436 struct clone *clone = ti->private; in clone_status() local
1440 if (get_clone_mode(clone) == CM_FAIL) { in clone_status()
1447 (void) commit_metadata(clone, NULL); in clone_status()
1449 r = dm_clone_get_free_metadata_block_count(clone->cmd, &nr_free_metadata_blocks); in clone_status()
1453 clone_device_name(clone), r); in clone_status()
1457 r = dm_clone_get_metadata_dev_size(clone->cmd, &nr_metadata_blocks); in clone_status()
1461 clone_device_name(clone), r); in clone_status()
1469 (unsigned long long)clone->region_size, in clone_status()
1470 dm_clone_nr_of_hydrated_regions(clone->cmd), in clone_status()
1471 clone->nr_regions, in clone_status()
1472 atomic_read(&clone->hydrations_in_flight)); in clone_status()
1474 emit_flags(clone, result, maxlen, &sz); in clone_status()
1475 emit_core_args(clone, result, maxlen, &sz); in clone_status()
1477 switch (get_clone_mode(clone)) { in clone_status()
1491 format_dev_t(buf, clone->metadata_dev->bdev->bd_dev); in clone_status()
1494 format_dev_t(buf, clone->dest_dev->bdev->bd_dev); in clone_status()
1497 format_dev_t(buf, clone->source_dev->bdev->bd_dev); in clone_status()
1500 for (i = 0; i < clone->nr_ctr_args; i++) in clone_status()
1501 DMEMIT(" %s", clone->ctr_args[i]); in clone_status()
1523 * Construct a clone device mapping:
1525 * clone <metadata dev> <destination dev> <source dev> <region size>
1529 * destination dev: The destination device, which will become a clone of the
1532 * region size: dm-clone unit size in sectors
1541 static int parse_feature_args(struct dm_arg_set *as, struct clone *clone) in parse_feature_args() argument
1546 struct dm_target *ti = clone->ti; in parse_feature_args()
1567 __clear_bit(DM_CLONE_HYDRATION_ENABLED, &clone->flags); in parse_feature_args()
1569 __clear_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags); in parse_feature_args()
1579 static int parse_core_args(struct dm_arg_set *as, struct clone *clone) in parse_core_args() argument
1585 struct dm_target *ti = clone->ti; in parse_core_args()
1594 clone->hydration_batch_size = DEFAULT_HYDRATION_BATCH_SIZE; in parse_core_args()
1595 clone->hydration_threshold = DEFAULT_HYDRATION_THRESHOLD; in parse_core_args()
1619 clone->hydration_threshold = value; in parse_core_args()
1625 clone->hydration_batch_size = value; in parse_core_args()
1635 static int parse_region_size(struct clone *clone, struct dm_arg_set *as, char **error) in parse_region_size() argument
1656 if (region_size % (bdev_logical_block_size(clone->source_dev->bdev) >> 9) || in parse_region_size()
1657 region_size % (bdev_logical_block_size(clone->dest_dev->bdev) >> 9)) { in parse_region_size()
1662 clone->region_size = region_size; in parse_region_size()
1681 static int parse_metadata_dev(struct clone *clone, struct dm_arg_set *as, char **error) in parse_metadata_dev() argument
1686 r = dm_get_device(clone->ti, dm_shift_arg(as), in parse_metadata_dev()
1687 BLK_OPEN_READ | BLK_OPEN_WRITE, &clone->metadata_dev); in parse_metadata_dev()
1693 metadata_dev_size = get_dev_size(clone->metadata_dev); in parse_metadata_dev()
1696 clone->metadata_dev->bdev, DM_CLONE_METADATA_MAX_SECTORS); in parse_metadata_dev()
1701 static int parse_dest_dev(struct clone *clone, struct dm_arg_set *as, char **error) in parse_dest_dev() argument
1706 r = dm_get_device(clone->ti, dm_shift_arg(as), in parse_dest_dev()
1707 BLK_OPEN_READ | BLK_OPEN_WRITE, &clone->dest_dev); in parse_dest_dev()
1713 dest_dev_size = get_dev_size(clone->dest_dev); in parse_dest_dev()
1714 if (dest_dev_size < clone->ti->len) { in parse_dest_dev()
1715 dm_put_device(clone->ti, clone->dest_dev); in parse_dest_dev()
1723 static int parse_source_dev(struct clone *clone, struct dm_arg_set *as, char **error) in parse_source_dev() argument
1728 r = dm_get_device(clone->ti, dm_shift_arg(as), BLK_OPEN_READ, in parse_source_dev()
1729 &clone->source_dev); in parse_source_dev()
1735 source_dev_size = get_dev_size(clone->source_dev); in parse_source_dev()
1736 if (source_dev_size < clone->ti->len) { in parse_source_dev()
1737 dm_put_device(clone->ti, clone->source_dev); in parse_source_dev()
1745 static int copy_ctr_args(struct clone *clone, int argc, const char **argv, char **error) in copy_ctr_args() argument
1765 clone->nr_ctr_args = argc; in copy_ctr_args()
1766 clone->ctr_args = copy; in copy_ctr_args()
1778 struct clone *clone; in clone_ctr() local
1789 clone = kzalloc(sizeof(*clone), GFP_KERNEL); in clone_ctr()
1790 if (!clone) { in clone_ctr()
1791 ti->error = "Failed to allocate clone structure"; in clone_ctr()
1795 clone->ti = ti; in clone_ctr()
1797 /* Initialize dm-clone flags */ in clone_ctr()
1798 __set_bit(DM_CLONE_HYDRATION_ENABLED, &clone->flags); in clone_ctr()
1799 __set_bit(DM_CLONE_HYDRATION_SUSPENDED, &clone->flags); in clone_ctr()
1800 __set_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags); in clone_ctr()
1802 r = parse_metadata_dev(clone, &as, &ti->error); in clone_ctr()
1806 r = parse_dest_dev(clone, &as, &ti->error); in clone_ctr()
1810 r = parse_source_dev(clone, &as, &ti->error); in clone_ctr()
1814 r = parse_region_size(clone, &as, &ti->error); in clone_ctr()
1818 clone->region_shift = __ffs(clone->region_size); in clone_ctr()
1819 nr_regions = dm_sector_div_up(ti->len, clone->region_size); in clone_ctr()
1828 clone->nr_regions = nr_regions; in clone_ctr()
1830 r = validate_nr_regions(clone->nr_regions, &ti->error); in clone_ctr()
1834 r = dm_set_target_max_io_len(ti, clone->region_size); in clone_ctr()
1840 r = parse_feature_args(&as, clone); in clone_ctr()
1844 r = parse_core_args(&as, clone); in clone_ctr()
1849 clone->cmd = dm_clone_metadata_open(clone->metadata_dev->bdev, ti->len, in clone_ctr()
1850 clone->region_size); in clone_ctr()
1851 if (IS_ERR(clone->cmd)) { in clone_ctr()
1853 r = PTR_ERR(clone->cmd); in clone_ctr()
1857 __set_clone_mode(clone, CM_WRITE); in clone_ctr()
1859 if (get_clone_mode(clone) != CM_WRITE) { in clone_ctr()
1865 clone->last_commit_jiffies = jiffies; in clone_ctr()
1868 r = hash_table_init(clone); in clone_ctr()
1874 atomic_set(&clone->ios_in_flight, 0); in clone_ctr()
1875 init_waitqueue_head(&clone->hydration_stopped); in clone_ctr()
1876 spin_lock_init(&clone->lock); in clone_ctr()
1877 bio_list_init(&clone->deferred_bios); in clone_ctr()
1878 bio_list_init(&clone->deferred_discard_bios); in clone_ctr()
1879 bio_list_init(&clone->deferred_flush_bios); in clone_ctr()
1880 bio_list_init(&clone->deferred_flush_completions); in clone_ctr()
1881 clone->hydration_offset = 0; in clone_ctr()
1882 atomic_set(&clone->hydrations_in_flight, 0); in clone_ctr()
1884 clone->wq = alloc_workqueue("dm-" DM_MSG_PREFIX, WQ_MEM_RECLAIM, 0); in clone_ctr()
1885 if (!clone->wq) { in clone_ctr()
1891 INIT_WORK(&clone->worker, do_worker); in clone_ctr()
1892 INIT_DELAYED_WORK(&clone->waker, do_waker); in clone_ctr()
1894 clone->kcopyd_client = dm_kcopyd_client_create(&dm_kcopyd_throttle); in clone_ctr()
1895 if (IS_ERR(clone->kcopyd_client)) { in clone_ctr()
1896 r = PTR_ERR(clone->kcopyd_client); in clone_ctr()
1900 r = mempool_init_slab_pool(&clone->hydration_pool, MIN_HYDRATIONS, in clone_ctr()
1908 r = copy_ctr_args(clone, argc - 3, (const char **)argv + 3, &ti->error); in clone_ctr()
1912 mutex_init(&clone->commit_lock); in clone_ctr()
1922 ti->private = clone; in clone_ctr()
1927 mempool_exit(&clone->hydration_pool); in clone_ctr()
1929 dm_kcopyd_client_destroy(clone->kcopyd_client); in clone_ctr()
1931 destroy_workqueue(clone->wq); in clone_ctr()
1933 hash_table_exit(clone); in clone_ctr()
1935 dm_clone_metadata_close(clone->cmd); in clone_ctr()
1937 dm_put_device(ti, clone->source_dev); in clone_ctr()
1939 dm_put_device(ti, clone->dest_dev); in clone_ctr()
1941 dm_put_device(ti, clone->metadata_dev); in clone_ctr()
1943 kfree(clone); in clone_ctr()
1951 struct clone *clone = ti->private; in clone_dtr() local
1953 mutex_destroy(&clone->commit_lock); in clone_dtr()
1955 for (i = 0; i < clone->nr_ctr_args; i++) in clone_dtr()
1956 kfree(clone->ctr_args[i]); in clone_dtr()
1957 kfree(clone->ctr_args); in clone_dtr()
1959 mempool_exit(&clone->hydration_pool); in clone_dtr()
1960 dm_kcopyd_client_destroy(clone->kcopyd_client); in clone_dtr()
1961 cancel_delayed_work_sync(&clone->waker); in clone_dtr()
1962 destroy_workqueue(clone->wq); in clone_dtr()
1963 hash_table_exit(clone); in clone_dtr()
1964 dm_clone_metadata_close(clone->cmd); in clone_dtr()
1965 dm_put_device(ti, clone->source_dev); in clone_dtr()
1966 dm_put_device(ti, clone->dest_dev); in clone_dtr()
1967 dm_put_device(ti, clone->metadata_dev); in clone_dtr()
1969 kfree(clone); in clone_dtr()
1976 struct clone *clone = ti->private; in clone_postsuspend() local
1993 cancel_delayed_work_sync(&clone->waker); in clone_postsuspend()
1995 set_bit(DM_CLONE_HYDRATION_SUSPENDED, &clone->flags); in clone_postsuspend()
2006 wait_event(clone->hydration_stopped, !atomic_read(&clone->hydrations_in_flight)); in clone_postsuspend()
2007 flush_workqueue(clone->wq); in clone_postsuspend()
2009 (void) commit_metadata(clone, NULL); in clone_postsuspend()
2014 struct clone *clone = ti->private; in clone_resume() local
2016 clear_bit(DM_CLONE_HYDRATION_SUSPENDED, &clone->flags); in clone_resume()
2017 do_waker(&clone->waker.work); in clone_resume()
2024 static void disable_passdown_if_not_supported(struct clone *clone) in disable_passdown_if_not_supported() argument
2026 struct block_device *dest_dev = clone->dest_dev->bdev; in disable_passdown_if_not_supported()
2030 if (!test_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags)) in disable_passdown_if_not_supported()
2035 else if (dest_limits->max_discard_sectors < clone->region_size) in disable_passdown_if_not_supported()
2041 clear_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags); in disable_passdown_if_not_supported()
2045 static void set_discard_limits(struct clone *clone, struct queue_limits *limits) in set_discard_limits() argument
2047 struct block_device *dest_bdev = clone->dest_dev->bdev; in set_discard_limits()
2050 if (!test_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags)) { in set_discard_limits()
2052 limits->discard_granularity = clone->region_size << SECTOR_SHIFT; in set_discard_limits()
2053 limits->max_discard_sectors = round_down(UINT_MAX >> SECTOR_SHIFT, clone->region_size); in set_discard_limits()
2072 struct clone *clone = ti->private; in clone_io_hints() local
2077 * dm-clone's region size (io_opt is a factor) do not override them. in clone_io_hints()
2079 if (io_opt_sectors < clone->region_size || in clone_io_hints()
2080 do_div(io_opt_sectors, clone->region_size)) { in clone_io_hints()
2081 blk_limits_io_min(limits, clone->region_size << SECTOR_SHIFT); in clone_io_hints()
2082 blk_limits_io_opt(limits, clone->region_size << SECTOR_SHIFT); in clone_io_hints()
2085 disable_passdown_if_not_supported(clone); in clone_io_hints()
2086 set_discard_limits(clone, limits); in clone_io_hints()
2093 struct clone *clone = ti->private; in clone_iterate_devices() local
2094 struct dm_dev *dest_dev = clone->dest_dev; in clone_iterate_devices()
2095 struct dm_dev *source_dev = clone->source_dev; in clone_iterate_devices()
2104 * dm-clone message functions.
2106 static void set_hydration_threshold(struct clone *clone, unsigned int nr_regions) in set_hydration_threshold() argument
2108 WRITE_ONCE(clone->hydration_threshold, nr_regions); in set_hydration_threshold()
2115 wake_worker(clone); in set_hydration_threshold()
2118 static void set_hydration_batch_size(struct clone *clone, unsigned int nr_regions) in set_hydration_batch_size() argument
2120 WRITE_ONCE(clone->hydration_batch_size, nr_regions); in set_hydration_batch_size()
2123 static void enable_hydration(struct clone *clone) in enable_hydration() argument
2125 if (!test_and_set_bit(DM_CLONE_HYDRATION_ENABLED, &clone->flags)) in enable_hydration()
2126 wake_worker(clone); in enable_hydration()
2129 static void disable_hydration(struct clone *clone) in disable_hydration() argument
2131 clear_bit(DM_CLONE_HYDRATION_ENABLED, &clone->flags); in disable_hydration()
2137 struct clone *clone = ti->private; in clone_message() local
2144 enable_hydration(clone); in clone_message()
2149 disable_hydration(clone); in clone_message()
2160 set_hydration_threshold(clone, value); in clone_message()
2169 set_hydration_batch_size(clone, value); in clone_message()
2174 DMERR("%s: Unsupported message `%s'", clone_device_name(clone), argv[0]); in clone_message()
2179 .name = "clone",
2226 MODULE_DESCRIPTION(DM_NAME " clone target");