216 static int superblock_read_lock(struct dm_cache_metadata *cmd,  in superblock_read_lock()  argument
219 	return dm_bm_read_lock(cmd->bm, CACHE_SUPERBLOCK_LOCATION,  in superblock_read_lock()
223 static int superblock_lock_zero(struct dm_cache_metadata *cmd,  in superblock_lock_zero()  argument
226 	return dm_bm_write_lock_zero(cmd->bm, CACHE_SUPERBLOCK_LOCATION,  in superblock_lock_zero()
230 static int superblock_lock(struct dm_cache_metadata *cmd,  in superblock_lock()  argument
233 	return dm_bm_write_lock(cmd->bm, CACHE_SUPERBLOCK_LOCATION,  in superblock_lock()
268 static void __setup_mapping_info(struct dm_cache_metadata *cmd)  in __setup_mapping_info()  argument
277 	dm_array_info_init(&cmd->info, cmd->tm, &vt);  in __setup_mapping_info()
279 	if (cmd->policy_hint_size) {  in __setup_mapping_info()
281 		dm_array_info_init(&cmd->hint_info, cmd->tm, &vt);  in __setup_mapping_info()
285 static int __save_sm_root(struct dm_cache_metadata *cmd)  in __save_sm_root()  argument
290 	r = dm_sm_root_size(cmd->metadata_sm, &metadata_len);  in __save_sm_root()
294 	return dm_sm_copy_root(cmd->metadata_sm, &cmd->metadata_space_map_root,  in __save_sm_root()
298 static void __copy_sm_root(struct dm_cache_metadata *cmd,  in __copy_sm_root()  argument
302 	       &cmd->metadata_space_map_root,  in __copy_sm_root()
303 	       sizeof(cmd->metadata_space_map_root));  in __copy_sm_root()
306 static int __write_initial_superblock(struct dm_cache_metadata *cmd)  in __write_initial_superblock()  argument
311 	sector_t bdev_size = i_size_read(cmd->bdev->bd_inode) >> SECTOR_SHIFT;  in __write_initial_superblock()
317 	r = dm_tm_pre_commit(cmd->tm);  in __write_initial_superblock()
325 	r = __save_sm_root(cmd);  in __write_initial_superblock()
329 	r = superblock_lock_zero(cmd, &sblock);  in __write_initial_superblock()
342 	__copy_sm_root(cmd, disk_super);  in __write_initial_superblock()
344 	disk_super->mapping_root = cpu_to_le64(cmd->root);  in __write_initial_superblock()
345 	disk_super->hint_root = cpu_to_le64(cmd->hint_root);  in __write_initial_superblock()
346 	disk_super->discard_root = cpu_to_le64(cmd->discard_root);  in __write_initial_superblock()
347 	disk_super->discard_block_size = cpu_to_le64(cmd->discard_block_size);  in __write_initial_superblock()
348 	disk_super->discard_nr_blocks = cpu_to_le64(from_dblock(cmd->discard_nr_blocks));  in __write_initial_superblock()
350 	disk_super->data_block_size = cpu_to_le32(cmd->data_block_size);  in __write_initial_superblock()
358 	return dm_tm_commit(cmd->tm, sblock);  in __write_initial_superblock()
361 static int __format_metadata(struct dm_cache_metadata *cmd)  in __format_metadata()  argument
365 	r = dm_tm_create_with_sm(cmd->bm, CACHE_SUPERBLOCK_LOCATION,  in __format_metadata()
366 				 &cmd->tm, &cmd->metadata_sm);  in __format_metadata()
372 	__setup_mapping_info(cmd);  in __format_metadata()
374 	r = dm_array_empty(&cmd->info, &cmd->root);  in __format_metadata()
378 	dm_disk_bitset_init(cmd->tm, &cmd->discard_info);  in __format_metadata()
380 	r = dm_bitset_empty(&cmd->discard_info, &cmd->discard_root);  in __format_metadata()
384 	cmd->discard_block_size = 0;  in __format_metadata()
385 	cmd->discard_nr_blocks = 0;  in __format_metadata()
387 	r = __write_initial_superblock(cmd);  in __format_metadata()
391 	cmd->clean_when_opened = true;  in __format_metadata()
395 	dm_tm_destroy(cmd->tm);  in __format_metadata()
396 	dm_sm_destroy(cmd->metadata_sm);  in __format_metadata()
402 				     struct dm_cache_metadata *cmd)  in __check_incompat_features()  argument
416 	if (get_disk_ro(cmd->bdev->bd_disk))  in __check_incompat_features()
429 static int __open_metadata(struct dm_cache_metadata *cmd)  in __open_metadata()  argument
436 	r = superblock_read_lock(cmd, &sblock);  in __open_metadata()
445 	if (le32_to_cpu(disk_super->data_block_size) != cmd->data_block_size) {  in __open_metadata()
448 		      (unsigned long long)cmd->data_block_size);  in __open_metadata()
453 	r = __check_incompat_features(disk_super, cmd);  in __open_metadata()
457 	r = dm_tm_open_with_sm(cmd->bm, CACHE_SUPERBLOCK_LOCATION,  in __open_metadata()
460 			       &cmd->tm, &cmd->metadata_sm);  in __open_metadata()
466 	__setup_mapping_info(cmd);  in __open_metadata()
467 	dm_disk_bitset_init(cmd->tm, &cmd->discard_info);  in __open_metadata()
469 	cmd->clean_when_opened = test_bit(CLEAN_SHUTDOWN, &sb_flags);  in __open_metadata()
479 static int __open_or_format_metadata(struct dm_cache_metadata *cmd,  in __open_or_format_metadata()  argument
485 	r = __superblock_all_zeroes(cmd->bm, &unformatted);  in __open_or_format_metadata()
490 		return format_device ? __format_metadata(cmd) : -EPERM;  in __open_or_format_metadata()
492 	return __open_metadata(cmd);  in __open_or_format_metadata()
495 static int __create_persistent_data_objects(struct dm_cache_metadata *cmd,  in __create_persistent_data_objects()  argument
499 	cmd->bm = dm_block_manager_create(cmd->bdev, DM_CACHE_METADATA_BLOCK_SIZE << SECTOR_SHIFT,  in __create_persistent_data_objects()
502 	if (IS_ERR(cmd->bm)) {  in __create_persistent_data_objects()
504 		return PTR_ERR(cmd->bm);  in __create_persistent_data_objects()
507 	r = __open_or_format_metadata(cmd, may_format_device);  in __create_persistent_data_objects()
509 		dm_block_manager_destroy(cmd->bm);  in __create_persistent_data_objects()
514 static void __destroy_persistent_data_objects(struct dm_cache_metadata *cmd)  in __destroy_persistent_data_objects()  argument
516 	dm_sm_destroy(cmd->metadata_sm);  in __destroy_persistent_data_objects()
517 	dm_tm_destroy(cmd->tm);  in __destroy_persistent_data_objects()
518 	dm_block_manager_destroy(cmd->bm);  in __destroy_persistent_data_objects()
542 static void read_superblock_fields(struct dm_cache_metadata *cmd,  in read_superblock_fields()  argument
545 	cmd->flags = le32_to_cpu(disk_super->flags);  in read_superblock_fields()
546 	cmd->root = le64_to_cpu(disk_super->mapping_root);  in read_superblock_fields()
547 	cmd->hint_root = le64_to_cpu(disk_super->hint_root);  in read_superblock_fields()
548 	cmd->discard_root = le64_to_cpu(disk_super->discard_root);  in read_superblock_fields()
549 	cmd->discard_block_size = le64_to_cpu(disk_super->discard_block_size);  in read_superblock_fields()
550 	cmd->discard_nr_blocks = to_dblock(le64_to_cpu(disk_super->discard_nr_blocks));  in read_superblock_fields()
551 	cmd->data_block_size = le32_to_cpu(disk_super->data_block_size);  in read_superblock_fields()
552 	cmd->cache_blocks = to_cblock(le32_to_cpu(disk_super->cache_blocks));  in read_superblock_fields()
553 	strncpy(cmd->policy_name, disk_super->policy_name, sizeof(cmd->policy_name));  in read_superblock_fields()
554 	cmd->policy_version[0] = le32_to_cpu(disk_super->policy_version[0]);  in read_superblock_fields()
555 	cmd->policy_version[1] = le32_to_cpu(disk_super->policy_version[1]);  in read_superblock_fields()
556 	cmd->policy_version[2] = le32_to_cpu(disk_super->policy_version[2]);  in read_superblock_fields()
557 	cmd->policy_hint_size = le32_to_cpu(disk_super->policy_hint_size);  in read_superblock_fields()
559 	cmd->stats.read_hits = le32_to_cpu(disk_super->read_hits);  in read_superblock_fields()
560 	cmd->stats.read_misses = le32_to_cpu(disk_super->read_misses);  in read_superblock_fields()
561 	cmd->stats.write_hits = le32_to_cpu(disk_super->write_hits);  in read_superblock_fields()
562 	cmd->stats.write_misses = le32_to_cpu(disk_super->write_misses);  in read_superblock_fields()
564 	cmd->changed = false;  in read_superblock_fields()
570 static int __begin_transaction_flags(struct dm_cache_metadata *cmd,  in __begin_transaction_flags()  argument
577 	r = superblock_lock(cmd, &sblock);  in __begin_transaction_flags()
583 	read_superblock_fields(cmd, disk_super);  in __begin_transaction_flags()
586 	return dm_bm_flush(cmd->bm);  in __begin_transaction_flags()
589 static int __begin_transaction(struct dm_cache_metadata *cmd)  in __begin_transaction()  argument
599 	r = superblock_read_lock(cmd, &sblock);  in __begin_transaction()
604 	read_superblock_fields(cmd, disk_super);  in __begin_transaction()
610 static int __commit_transaction(struct dm_cache_metadata *cmd,  in __commit_transaction()  argument
622 	r = dm_bitset_flush(&cmd->discard_info, cmd->discard_root,  in __commit_transaction()
623 			    &cmd->discard_root);  in __commit_transaction()
627 	r = dm_tm_pre_commit(cmd->tm);  in __commit_transaction()
631 	r = __save_sm_root(cmd);  in __commit_transaction()
635 	r = superblock_lock(cmd, &sblock);  in __commit_transaction()
641 	disk_super->flags = cpu_to_le32(cmd->flags);  in __commit_transaction()
645 	disk_super->mapping_root = cpu_to_le64(cmd->root);  in __commit_transaction()
646 	disk_super->hint_root = cpu_to_le64(cmd->hint_root);  in __commit_transaction()
647 	disk_super->discard_root = cpu_to_le64(cmd->discard_root);  in __commit_transaction()
648 	disk_super->discard_block_size = cpu_to_le64(cmd->discard_block_size);  in __commit_transaction()
649 	disk_super->discard_nr_blocks = cpu_to_le64(from_dblock(cmd->discard_nr_blocks));  in __commit_transaction()
650 	disk_super->cache_blocks = cpu_to_le32(from_cblock(cmd->cache_blocks));  in __commit_transaction()
651 	strncpy(disk_super->policy_name, cmd->policy_name, sizeof(disk_super->policy_name));  in __commit_transaction()
652 	disk_super->policy_version[0] = cpu_to_le32(cmd->policy_version[0]);  in __commit_transaction()
653 	disk_super->policy_version[1] = cpu_to_le32(cmd->policy_version[1]);  in __commit_transaction()
654 	disk_super->policy_version[2] = cpu_to_le32(cmd->policy_version[2]);  in __commit_transaction()
656 	disk_super->read_hits = cpu_to_le32(cmd->stats.read_hits);  in __commit_transaction()
657 	disk_super->read_misses = cpu_to_le32(cmd->stats.read_misses);  in __commit_transaction()
658 	disk_super->write_hits = cpu_to_le32(cmd->stats.write_hits);  in __commit_transaction()
659 	disk_super->write_misses = cpu_to_le32(cmd->stats.write_misses);  in __commit_transaction()
660 	__copy_sm_root(cmd, disk_super);  in __commit_transaction()
662 	return dm_tm_commit(cmd->tm, sblock);  in __commit_transaction()
698 	struct dm_cache_metadata *cmd;  in metadata_open()  local
700 	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);  in metadata_open()
701 	if (!cmd) {  in metadata_open()
706 	atomic_set(&cmd->ref_count, 1);  in metadata_open()
707 	init_rwsem(&cmd->root_lock);  in metadata_open()
708 	cmd->bdev = bdev;  in metadata_open()
709 	cmd->data_block_size = data_block_size;  in metadata_open()
710 	cmd->cache_blocks = 0;  in metadata_open()
711 	cmd->policy_hint_size = policy_hint_size;  in metadata_open()
712 	cmd->changed = true;  in metadata_open()
713 	cmd->fail_io = false;  in metadata_open()
715 	r = __create_persistent_data_objects(cmd, may_format_device);  in metadata_open()
717 		kfree(cmd);  in metadata_open()
721 	r = __begin_transaction_flags(cmd, clear_clean_shutdown);  in metadata_open()
723 		dm_cache_metadata_close(cmd);  in metadata_open()
727 	return cmd;  in metadata_open()
740 	struct dm_cache_metadata *cmd;  in lookup()  local
742 	list_for_each_entry(cmd, &table, list)  in lookup()
743 		if (cmd->bdev == bdev) {  in lookup()
744 			atomic_inc(&cmd->ref_count);  in lookup()
745 			return cmd;  in lookup()
756 	struct dm_cache_metadata *cmd, *cmd2;  in lookup_or_open()  local
759 	cmd = lookup(bdev);  in lookup_or_open()
762 	if (cmd)  in lookup_or_open()
763 		return cmd;  in lookup_or_open()
765 	cmd = metadata_open(bdev, data_block_size, may_format_device, policy_hint_size);  in lookup_or_open()
766 	if (!IS_ERR(cmd)) {  in lookup_or_open()
771 			__destroy_persistent_data_objects(cmd);  in lookup_or_open()
772 			kfree(cmd);  in lookup_or_open()
775 		list_add(&cmd->list, &table);  in lookup_or_open()
779 	return cmd;  in lookup_or_open()
782 static bool same_params(struct dm_cache_metadata *cmd, sector_t data_block_size)  in same_params()  argument
784 	if (cmd->data_block_size != data_block_size) {  in same_params()
787 		      (unsigned long long) cmd->data_block_size);  in same_params()
799 	struct dm_cache_metadata *cmd = lookup_or_open(bdev, data_block_size,  in dm_cache_metadata_open()  local
802 	if (!IS_ERR(cmd) && !same_params(cmd, data_block_size)) {  in dm_cache_metadata_open()
803 		dm_cache_metadata_close(cmd);  in dm_cache_metadata_open()
807 	return cmd;  in dm_cache_metadata_open()
810 void dm_cache_metadata_close(struct dm_cache_metadata *cmd)  in dm_cache_metadata_close()  argument
812 	if (atomic_dec_and_test(&cmd->ref_count)) {  in dm_cache_metadata_close()
814 		list_del(&cmd->list);  in dm_cache_metadata_close()
817 		if (!cmd->fail_io)  in dm_cache_metadata_close()
818 			__destroy_persistent_data_objects(cmd);  in dm_cache_metadata_close()
819 		kfree(cmd);  in dm_cache_metadata_close()
826 static int block_unmapped_or_clean(struct dm_cache_metadata *cmd, dm_cblock_t b,  in block_unmapped_or_clean()  argument
834 	r = dm_array_get_value(&cmd->info, cmd->root, from_cblock(b), &value);  in block_unmapped_or_clean()
846 static int blocks_are_unmapped_or_clean(struct dm_cache_metadata *cmd,  in blocks_are_unmapped_or_clean()  argument
854 		r = block_unmapped_or_clean(cmd, begin, result);  in blocks_are_unmapped_or_clean()
870 static bool cmd_write_lock(struct dm_cache_metadata *cmd)  in cmd_write_lock()  argument
872 	down_write(&cmd->root_lock);  in cmd_write_lock()
873 	if (cmd->fail_io || dm_bm_is_read_only(cmd->bm)) {  in cmd_write_lock()
874 		up_write(&cmd->root_lock);  in cmd_write_lock()
880 #define WRITE_LOCK(cmd)				\  argument
882 		if (!cmd_write_lock((cmd)))	\
886 #define WRITE_LOCK_VOID(cmd)			\  argument
888 		if (!cmd_write_lock((cmd)))	\
892 #define WRITE_UNLOCK(cmd) \  argument
893 	up_write(&(cmd)->root_lock)
895 static bool cmd_read_lock(struct dm_cache_metadata *cmd)  in cmd_read_lock()  argument
897 	down_read(&cmd->root_lock);  in cmd_read_lock()
898 	if (cmd->fail_io) {  in cmd_read_lock()
899 		up_read(&cmd->root_lock);  in cmd_read_lock()
905 #define READ_LOCK(cmd)				\  argument
907 		if (!cmd_read_lock((cmd)))	\
911 #define READ_LOCK_VOID(cmd)			\  argument
913 		if (!cmd_read_lock((cmd)))	\
917 #define READ_UNLOCK(cmd) \  argument
918 	up_read(&(cmd)->root_lock)
920 int dm_cache_resize(struct dm_cache_metadata *cmd, dm_cblock_t new_cache_size)  in dm_cache_resize()  argument
926 	WRITE_LOCK(cmd);  in dm_cache_resize()
929 	if (from_cblock(new_cache_size) < from_cblock(cmd->cache_blocks)) {  in dm_cache_resize()
930 		r = blocks_are_unmapped_or_clean(cmd, new_cache_size, cmd->cache_blocks, &clean);  in dm_cache_resize()
944 	r = dm_array_resize(&cmd->info, cmd->root, from_cblock(cmd->cache_blocks),  in dm_cache_resize()
946 			    &null_mapping, &cmd->root);  in dm_cache_resize()
948 		cmd->cache_blocks = new_cache_size;  in dm_cache_resize()
949 	cmd->changed = true;  in dm_cache_resize()
952 	WRITE_UNLOCK(cmd);  in dm_cache_resize()
957 int dm_cache_discard_bitset_resize(struct dm_cache_metadata *cmd,  in dm_cache_discard_bitset_resize()  argument
963 	WRITE_LOCK(cmd);  in dm_cache_discard_bitset_resize()
964 	r = dm_bitset_resize(&cmd->discard_info,  in dm_cache_discard_bitset_resize()
965 			     cmd->discard_root,  in dm_cache_discard_bitset_resize()
966 			     from_dblock(cmd->discard_nr_blocks),  in dm_cache_discard_bitset_resize()
968 			     false, &cmd->discard_root);  in dm_cache_discard_bitset_resize()
970 		cmd->discard_block_size = discard_block_size;  in dm_cache_discard_bitset_resize()
971 		cmd->discard_nr_blocks = new_nr_entries;  in dm_cache_discard_bitset_resize()
974 	cmd->changed = true;  in dm_cache_discard_bitset_resize()
975 	WRITE_UNLOCK(cmd);  in dm_cache_discard_bitset_resize()
980 static int __set_discard(struct dm_cache_metadata *cmd, dm_dblock_t b)  in __set_discard()  argument
982 	return dm_bitset_set_bit(&cmd->discard_info, cmd->discard_root,  in __set_discard()
983 				 from_dblock(b), &cmd->discard_root);  in __set_discard()
986 static int __clear_discard(struct dm_cache_metadata *cmd, dm_dblock_t b)  in __clear_discard()  argument
988 	return dm_bitset_clear_bit(&cmd->discard_info, cmd->discard_root,  in __clear_discard()
989 				   from_dblock(b), &cmd->discard_root);  in __clear_discard()
992 static int __is_discarded(struct dm_cache_metadata *cmd, dm_dblock_t b,  in __is_discarded()  argument
995 	return dm_bitset_test_bit(&cmd->discard_info, cmd->discard_root,  in __is_discarded()
996 				  from_dblock(b), &cmd->discard_root,  in __is_discarded()
1000 static int __discard(struct dm_cache_metadata *cmd,  in __discard()  argument
1005 	r = (discard ? __set_discard : __clear_discard)(cmd, dblock);  in __discard()
1009 	cmd->changed = true;  in __discard()
1013 int dm_cache_set_discard(struct dm_cache_metadata *cmd,  in dm_cache_set_discard()  argument
1018 	WRITE_LOCK(cmd);  in dm_cache_set_discard()
1019 	r = __discard(cmd, dblock, discard);  in dm_cache_set_discard()
1020 	WRITE_UNLOCK(cmd);  in dm_cache_set_discard()
1025 static int __load_discards(struct dm_cache_metadata *cmd,  in __load_discards()  argument
1032 	for (b = 0; b < from_dblock(cmd->discard_nr_blocks); b++) {  in __load_discards()
1035 		if (cmd->clean_when_opened) {  in __load_discards()
1036 			r = __is_discarded(cmd, dblock, &discard);  in __load_discards()
1042 		r = fn(context, cmd->discard_block_size, dblock, discard);  in __load_discards()
1050 int dm_cache_load_discards(struct dm_cache_metadata *cmd,  in dm_cache_load_discards()  argument
1055 	READ_LOCK(cmd);  in dm_cache_load_discards()
1056 	r = __load_discards(cmd, fn, context);  in dm_cache_load_discards()
1057 	READ_UNLOCK(cmd);  in dm_cache_load_discards()
1062 int dm_cache_size(struct dm_cache_metadata *cmd, dm_cblock_t *result)  in dm_cache_size()  argument
1064 	READ_LOCK(cmd);  in dm_cache_size()
1065 	*result = cmd->cache_blocks;  in dm_cache_size()
1066 	READ_UNLOCK(cmd);  in dm_cache_size()
1071 static int __remove(struct dm_cache_metadata *cmd, dm_cblock_t cblock)  in __remove()  argument
1077 	r = dm_array_set_value(&cmd->info, cmd->root, from_cblock(cblock),  in __remove()
1078 			       &value, &cmd->root);  in __remove()
1082 	cmd->changed = true;  in __remove()
1086 int dm_cache_remove_mapping(struct dm_cache_metadata *cmd, dm_cblock_t cblock)  in dm_cache_remove_mapping()  argument
1090 	WRITE_LOCK(cmd);  in dm_cache_remove_mapping()
1091 	r = __remove(cmd, cblock);  in dm_cache_remove_mapping()
1092 	WRITE_UNLOCK(cmd);  in dm_cache_remove_mapping()
1097 static int __insert(struct dm_cache_metadata *cmd,  in __insert()  argument
1104 	r = dm_array_set_value(&cmd->info, cmd->root, from_cblock(cblock),  in __insert()
1105 			       &value, &cmd->root);  in __insert()
1109 	cmd->changed = true;  in __insert()
1113 int dm_cache_insert_mapping(struct dm_cache_metadata *cmd,  in dm_cache_insert_mapping()  argument
1118 	WRITE_LOCK(cmd);  in dm_cache_insert_mapping()
1119 	r = __insert(cmd, cblock, oblock);  in dm_cache_insert_mapping()
1120 	WRITE_UNLOCK(cmd);  in dm_cache_insert_mapping()
1129 	struct dm_cache_metadata *cmd;  member
1134 static bool policy_unchanged(struct dm_cache_metadata *cmd,  in policy_unchanged()  argument
1144 	if (strncmp(cmd->policy_name, policy_name, sizeof(cmd->policy_name)))  in policy_unchanged()
1150 	if (cmd->policy_version[0] != policy_version[0])  in policy_unchanged()
1156 	if (cmd->policy_hint_size != policy_hint_size)  in policy_unchanged()
1162 static bool hints_array_initialized(struct dm_cache_metadata *cmd)  in hints_array_initialized()  argument
1164 	return cmd->hint_root && cmd->policy_hint_size;  in hints_array_initialized()
1167 static bool hints_array_available(struct dm_cache_metadata *cmd,  in hints_array_available()  argument
1170 	return cmd->clean_when_opened && policy_unchanged(cmd, policy) &&  in hints_array_available()
1171 		hints_array_initialized(cmd);  in hints_array_available()
1183 	struct dm_cache_metadata *cmd = thunk->cmd;  in __load_mapping()  local
1190 			r = dm_array_get_value(&cmd->hint_info, cmd->hint_root,  in __load_mapping()
1204 static int __load_mappings(struct dm_cache_metadata *cmd,  in __load_mappings()  argument
1213 	thunk.cmd = cmd;  in __load_mappings()
1214 	thunk.respect_dirty_flags = cmd->clean_when_opened;  in __load_mappings()
1215 	thunk.hints_valid = hints_array_available(cmd, policy);  in __load_mappings()
1217 	return dm_array_walk(&cmd->info, cmd->root, __load_mapping, &thunk);  in __load_mappings()
1220 int dm_cache_load_mappings(struct dm_cache_metadata *cmd,  in dm_cache_load_mappings()  argument
1226 	READ_LOCK(cmd);  in dm_cache_load_mappings()
1227 	r = __load_mappings(cmd, policy, fn, context);  in dm_cache_load_mappings()
1228 	READ_UNLOCK(cmd);  in dm_cache_load_mappings()
1246 static int __dump_mappings(struct dm_cache_metadata *cmd)  in __dump_mappings()  argument
1248 	return dm_array_walk(&cmd->info, cmd->root, __dump_mapping, NULL);  in __dump_mappings()
1251 void dm_cache_dump(struct dm_cache_metadata *cmd)  in dm_cache_dump()  argument
1253 	READ_LOCK_VOID(cmd);  in dm_cache_dump()
1254 	__dump_mappings(cmd);  in dm_cache_dump()
1255 	READ_UNLOCK(cmd);  in dm_cache_dump()
1258 int dm_cache_changed_this_transaction(struct dm_cache_metadata *cmd)  in dm_cache_changed_this_transaction()  argument
1262 	READ_LOCK(cmd);  in dm_cache_changed_this_transaction()
1263 	r = cmd->changed;  in dm_cache_changed_this_transaction()
1264 	READ_UNLOCK(cmd);  in dm_cache_changed_this_transaction()
1269 static int __dirty(struct dm_cache_metadata *cmd, dm_cblock_t cblock, bool dirty)  in __dirty()  argument
1276 	r = dm_array_get_value(&cmd->info, cmd->root, from_cblock(cblock), &value);  in __dirty()
1289 	r = dm_array_set_value(&cmd->info, cmd->root, from_cblock(cblock),  in __dirty()
1290 			       &value, &cmd->root);  in __dirty()
1294 	cmd->changed = true;  in __dirty()
1299 int dm_cache_set_dirty(struct dm_cache_metadata *cmd,  in dm_cache_set_dirty()  argument
1304 	WRITE_LOCK(cmd);  in dm_cache_set_dirty()
1305 	r = __dirty(cmd, cblock, dirty);  in dm_cache_set_dirty()
1306 	WRITE_UNLOCK(cmd);  in dm_cache_set_dirty()
1311 void dm_cache_metadata_get_stats(struct dm_cache_metadata *cmd,  in dm_cache_metadata_get_stats()  argument
1314 	READ_LOCK_VOID(cmd);  in dm_cache_metadata_get_stats()
1315 	*stats = cmd->stats;  in dm_cache_metadata_get_stats()
1316 	READ_UNLOCK(cmd);  in dm_cache_metadata_get_stats()
1319 void dm_cache_metadata_set_stats(struct dm_cache_metadata *cmd,  in dm_cache_metadata_set_stats()  argument
1322 	WRITE_LOCK_VOID(cmd);  in dm_cache_metadata_set_stats()
1323 	cmd->stats = *stats;  in dm_cache_metadata_set_stats()
1324 	WRITE_UNLOCK(cmd);  in dm_cache_metadata_set_stats()
1327 int dm_cache_commit(struct dm_cache_metadata *cmd, bool clean_shutdown)  in dm_cache_commit()  argument
1333 	WRITE_LOCK(cmd);  in dm_cache_commit()
1334 	r = __commit_transaction(cmd, mutator);  in dm_cache_commit()
1338 	r = __begin_transaction(cmd);  in dm_cache_commit()
1341 	WRITE_UNLOCK(cmd);  in dm_cache_commit()
1345 int dm_cache_get_free_metadata_block_count(struct dm_cache_metadata *cmd,  in dm_cache_get_free_metadata_block_count()  argument
1350 	READ_LOCK(cmd);  in dm_cache_get_free_metadata_block_count()
1351 	r = dm_sm_get_nr_free(cmd->metadata_sm, result);  in dm_cache_get_free_metadata_block_count()
1352 	READ_UNLOCK(cmd);  in dm_cache_get_free_metadata_block_count()
1357 int dm_cache_get_metadata_dev_size(struct dm_cache_metadata *cmd,  in dm_cache_get_metadata_dev_size()  argument
1362 	READ_LOCK(cmd);  in dm_cache_get_metadata_dev_size()
1363 	r = dm_sm_get_nr_blocks(cmd->metadata_sm, result);  in dm_cache_get_metadata_dev_size()
1364 	READ_UNLOCK(cmd);  in dm_cache_get_metadata_dev_size()
1371 static int begin_hints(struct dm_cache_metadata *cmd, struct dm_cache_policy *policy)  in begin_hints()  argument
1380 	    (strlen(policy_name) > sizeof(cmd->policy_name) - 1))  in begin_hints()
1383 	if (!policy_unchanged(cmd, policy)) {  in begin_hints()
1384 		strncpy(cmd->policy_name, policy_name, sizeof(cmd->policy_name));  in begin_hints()
1385 		memcpy(cmd->policy_version, policy_version, sizeof(cmd->policy_version));  in begin_hints()
1390 		cmd->policy_hint_size = hint_size;  in begin_hints()
1392 		if (cmd->hint_root) {  in begin_hints()
1393 			r = dm_array_del(&cmd->hint_info, cmd->hint_root);  in begin_hints()
1398 		r = dm_array_empty(&cmd->hint_info, &cmd->hint_root);  in begin_hints()
1404 		r = dm_array_resize(&cmd->hint_info, cmd->hint_root, 0,  in begin_hints()
1405 				    from_cblock(cmd->cache_blocks),  in begin_hints()
1406 				    &value, &cmd->hint_root);  in begin_hints()
1416 	struct dm_cache_metadata *cmd = context;  in save_hint()  local
1422 	r = dm_array_set_value(&cmd->hint_info, cmd->hint_root,  in save_hint()
1423 			       from_cblock(cblock), &value, &cmd->hint_root);  in save_hint()
1424 	cmd->changed = true;  in save_hint()
1429 static int write_hints(struct dm_cache_metadata *cmd, struct dm_cache_policy *policy)  in write_hints()  argument
1433 	r = begin_hints(cmd, policy);  in write_hints()
1439 	return policy_walk_mappings(policy, save_hint, cmd);  in write_hints()
1442 int dm_cache_write_hints(struct dm_cache_metadata *cmd, struct dm_cache_policy *policy)  in dm_cache_write_hints()  argument
1446 	WRITE_LOCK(cmd);  in dm_cache_write_hints()
1447 	r = write_hints(cmd, policy);  in dm_cache_write_hints()
1448 	WRITE_UNLOCK(cmd);  in dm_cache_write_hints()
1453 int dm_cache_metadata_all_clean(struct dm_cache_metadata *cmd, bool *result)  in dm_cache_metadata_all_clean()  argument
1457 	READ_LOCK(cmd);  in dm_cache_metadata_all_clean()
1458 	r = blocks_are_unmapped_or_clean(cmd, 0, cmd->cache_blocks, result);  in dm_cache_metadata_all_clean()
1459 	READ_UNLOCK(cmd);  in dm_cache_metadata_all_clean()
1464 void dm_cache_metadata_set_read_only(struct dm_cache_metadata *cmd)  in dm_cache_metadata_set_read_only()  argument
1466 	WRITE_LOCK_VOID(cmd);  in dm_cache_metadata_set_read_only()
1467 	dm_bm_set_read_only(cmd->bm);  in dm_cache_metadata_set_read_only()
1468 	WRITE_UNLOCK(cmd);  in dm_cache_metadata_set_read_only()
1471 void dm_cache_metadata_set_read_write(struct dm_cache_metadata *cmd)  in dm_cache_metadata_set_read_write()  argument
1473 	WRITE_LOCK_VOID(cmd);  in dm_cache_metadata_set_read_write()
1474 	dm_bm_set_read_write(cmd->bm);  in dm_cache_metadata_set_read_write()
1475 	WRITE_UNLOCK(cmd);  in dm_cache_metadata_set_read_write()
1478 int dm_cache_metadata_set_needs_check(struct dm_cache_metadata *cmd)  in dm_cache_metadata_set_needs_check()  argument
1484 	WRITE_LOCK(cmd);  in dm_cache_metadata_set_needs_check()
1485 	set_bit(NEEDS_CHECK, &cmd->flags);  in dm_cache_metadata_set_needs_check()
1487 	r = superblock_lock(cmd, &sblock);  in dm_cache_metadata_set_needs_check()
1494 	disk_super->flags = cpu_to_le32(cmd->flags);  in dm_cache_metadata_set_needs_check()
1499 	WRITE_UNLOCK(cmd);  in dm_cache_metadata_set_needs_check()
1503 int dm_cache_metadata_needs_check(struct dm_cache_metadata *cmd, bool *result)  in dm_cache_metadata_needs_check()  argument
1505 	READ_LOCK(cmd);  in dm_cache_metadata_needs_check()
1506 	*result = !!test_bit(NEEDS_CHECK, &cmd->flags);  in dm_cache_metadata_needs_check()
1507 	READ_UNLOCK(cmd);  in dm_cache_metadata_needs_check()
1512 int dm_cache_metadata_abort(struct dm_cache_metadata *cmd)  in dm_cache_metadata_abort()  argument
1516 	WRITE_LOCK(cmd);  in dm_cache_metadata_abort()
1517 	__destroy_persistent_data_objects(cmd);  in dm_cache_metadata_abort()
1518 	r = __create_persistent_data_objects(cmd, false);  in dm_cache_metadata_abort()
1520 		cmd->fail_io = true;  in dm_cache_metadata_abort()
1521 	WRITE_UNLOCK(cmd);  in dm_cache_metadata_abort()