Lines Matching refs:cmd
239 static int superblock_read_lock(struct dm_cache_metadata *cmd,
242 return dm_bm_read_lock(cmd->bm, CACHE_SUPERBLOCK_LOCATION,
246 static int superblock_lock_zero(struct dm_cache_metadata *cmd,
249 return dm_bm_write_lock_zero(cmd->bm, CACHE_SUPERBLOCK_LOCATION,
253 static int superblock_lock(struct dm_cache_metadata *cmd,
256 return dm_bm_write_lock(cmd->bm, CACHE_SUPERBLOCK_LOCATION,
291 static void __setup_mapping_info(struct dm_cache_metadata *cmd)
300 dm_array_info_init(&cmd->info, cmd->tm, &vt);
302 if (cmd->policy_hint_size) {
304 dm_array_info_init(&cmd->hint_info, cmd->tm, &vt);
308 static int __save_sm_root(struct dm_cache_metadata *cmd)
313 r = dm_sm_root_size(cmd->metadata_sm, &metadata_len);
317 return dm_sm_copy_root(cmd->metadata_sm, &cmd->metadata_space_map_root,
321 static void __copy_sm_root(struct dm_cache_metadata *cmd,
325 &cmd->metadata_space_map_root,
326 sizeof(cmd->metadata_space_map_root));
329 static bool separate_dirty_bits(struct dm_cache_metadata *cmd)
331 return cmd->version >= 2;
334 static int __write_initial_superblock(struct dm_cache_metadata *cmd)
339 sector_t bdev_size = bdev_nr_sectors(cmd->bdev);
345 r = dm_tm_pre_commit(cmd->tm);
353 r = __save_sm_root(cmd);
357 r = superblock_lock_zero(cmd, &sblock);
365 disk_super->version = cpu_to_le32(cmd->version);
370 __copy_sm_root(cmd, disk_super);
372 disk_super->mapping_root = cpu_to_le64(cmd->root);
373 disk_super->hint_root = cpu_to_le64(cmd->hint_root);
374 disk_super->discard_root = cpu_to_le64(cmd->discard_root);
375 disk_super->discard_block_size = cpu_to_le64(cmd->discard_block_size);
376 disk_super->discard_nr_blocks = cpu_to_le64(from_dblock(cmd->discard_nr_blocks));
378 disk_super->data_block_size = cpu_to_le32(cmd->data_block_size);
386 if (separate_dirty_bits(cmd))
387 disk_super->dirty_root = cpu_to_le64(cmd->dirty_root);
389 return dm_tm_commit(cmd->tm, sblock);
392 static int __format_metadata(struct dm_cache_metadata *cmd)
396 r = dm_tm_create_with_sm(cmd->bm, CACHE_SUPERBLOCK_LOCATION,
397 &cmd->tm, &cmd->metadata_sm);
403 __setup_mapping_info(cmd);
405 r = dm_array_empty(&cmd->info, &cmd->root);
409 if (separate_dirty_bits(cmd)) {
410 dm_disk_bitset_init(cmd->tm, &cmd->dirty_info);
411 r = dm_bitset_empty(&cmd->dirty_info, &cmd->dirty_root);
416 dm_disk_bitset_init(cmd->tm, &cmd->discard_info);
417 r = dm_bitset_empty(&cmd->discard_info, &cmd->discard_root);
421 cmd->discard_block_size = 0;
422 cmd->discard_nr_blocks = 0;
424 r = __write_initial_superblock(cmd);
428 cmd->clean_when_opened = true;
432 dm_tm_destroy(cmd->tm);
433 dm_sm_destroy(cmd->metadata_sm);
439 struct dm_cache_metadata *cmd)
454 if (bdev_read_only(cmd->bdev))
467 static int __open_metadata(struct dm_cache_metadata *cmd)
474 r = superblock_read_lock(cmd, &sblock);
483 if (le32_to_cpu(disk_super->data_block_size) != cmd->data_block_size) {
486 (unsigned long long)cmd->data_block_size);
491 r = __check_incompat_features(disk_super, cmd);
495 r = dm_tm_open_with_sm(cmd->bm, CACHE_SUPERBLOCK_LOCATION,
498 &cmd->tm, &cmd->metadata_sm);
504 __setup_mapping_info(cmd);
505 dm_disk_bitset_init(cmd->tm, &cmd->dirty_info);
506 dm_disk_bitset_init(cmd->tm, &cmd->discard_info);
508 cmd->clean_when_opened = test_bit(CLEAN_SHUTDOWN, &sb_flags);
518 static int __open_or_format_metadata(struct dm_cache_metadata *cmd,
524 r = __superblock_all_zeroes(cmd->bm, &unformatted);
529 return format_device ? __format_metadata(cmd) : -EPERM;
531 return __open_metadata(cmd);
534 static int __create_persistent_data_objects(struct dm_cache_metadata *cmd,
539 cmd->bm = dm_block_manager_create(cmd->bdev, DM_CACHE_METADATA_BLOCK_SIZE << SECTOR_SHIFT,
541 if (IS_ERR(cmd->bm)) {
543 r = PTR_ERR(cmd->bm);
544 cmd->bm = NULL;
548 r = __open_or_format_metadata(cmd, may_format_device);
550 dm_block_manager_destroy(cmd->bm);
551 cmd->bm = NULL;
557 static void __destroy_persistent_data_objects(struct dm_cache_metadata *cmd,
560 dm_sm_destroy(cmd->metadata_sm);
561 dm_tm_destroy(cmd->tm);
563 dm_block_manager_destroy(cmd->bm);
588 static void read_superblock_fields(struct dm_cache_metadata *cmd,
591 cmd->version = le32_to_cpu(disk_super->version);
592 cmd->flags = le32_to_cpu(disk_super->flags);
593 cmd->root = le64_to_cpu(disk_super->mapping_root);
594 cmd->hint_root = le64_to_cpu(disk_super->hint_root);
595 cmd->discard_root = le64_to_cpu(disk_super->discard_root);
596 cmd->discard_block_size = le64_to_cpu(disk_super->discard_block_size);
597 cmd->discard_nr_blocks = to_dblock(le64_to_cpu(disk_super->discard_nr_blocks));
598 cmd->data_block_size = le32_to_cpu(disk_super->data_block_size);
599 cmd->cache_blocks = to_cblock(le32_to_cpu(disk_super->cache_blocks));
600 strscpy(cmd->policy_name, disk_super->policy_name, sizeof(cmd->policy_name));
601 cmd->policy_version[0] = le32_to_cpu(disk_super->policy_version[0]);
602 cmd->policy_version[1] = le32_to_cpu(disk_super->policy_version[1]);
603 cmd->policy_version[2] = le32_to_cpu(disk_super->policy_version[2]);
604 cmd->policy_hint_size = le32_to_cpu(disk_super->policy_hint_size);
606 cmd->stats.read_hits = le32_to_cpu(disk_super->read_hits);
607 cmd->stats.read_misses = le32_to_cpu(disk_super->read_misses);
608 cmd->stats.write_hits = le32_to_cpu(disk_super->write_hits);
609 cmd->stats.write_misses = le32_to_cpu(disk_super->write_misses);
611 if (separate_dirty_bits(cmd))
612 cmd->dirty_root = le64_to_cpu(disk_super->dirty_root);
614 cmd->changed = false;
620 static int __begin_transaction_flags(struct dm_cache_metadata *cmd,
627 r = superblock_lock(cmd, &sblock);
633 read_superblock_fields(cmd, disk_super);
636 return dm_bm_flush(cmd->bm);
639 static int __begin_transaction(struct dm_cache_metadata *cmd)
649 r = superblock_read_lock(cmd, &sblock);
654 read_superblock_fields(cmd, disk_super);
660 static int __commit_transaction(struct dm_cache_metadata *cmd,
672 if (separate_dirty_bits(cmd)) {
673 r = dm_bitset_flush(&cmd->dirty_info, cmd->dirty_root,
674 &cmd->dirty_root);
679 r = dm_bitset_flush(&cmd->discard_info, cmd->discard_root,
680 &cmd->discard_root);
684 r = dm_tm_pre_commit(cmd->tm);
688 r = __save_sm_root(cmd);
692 r = superblock_lock(cmd, &sblock);
698 disk_super->flags = cpu_to_le32(cmd->flags);
702 disk_super->mapping_root = cpu_to_le64(cmd->root);
703 if (separate_dirty_bits(cmd))
704 disk_super->dirty_root = cpu_to_le64(cmd->dirty_root);
705 disk_super->hint_root = cpu_to_le64(cmd->hint_root);
706 disk_super->discard_root = cpu_to_le64(cmd->discard_root);
707 disk_super->discard_block_size = cpu_to_le64(cmd->discard_block_size);
708 disk_super->discard_nr_blocks = cpu_to_le64(from_dblock(cmd->discard_nr_blocks));
709 disk_super->cache_blocks = cpu_to_le32(from_cblock(cmd->cache_blocks));
710 strscpy(disk_super->policy_name, cmd->policy_name, sizeof(disk_super->policy_name));
711 disk_super->policy_version[0] = cpu_to_le32(cmd->policy_version[0]);
712 disk_super->policy_version[1] = cpu_to_le32(cmd->policy_version[1]);
713 disk_super->policy_version[2] = cpu_to_le32(cmd->policy_version[2]);
714 disk_super->policy_hint_size = cpu_to_le32(cmd->policy_hint_size);
716 disk_super->read_hits = cpu_to_le32(cmd->stats.read_hits);
717 disk_super->read_misses = cpu_to_le32(cmd->stats.read_misses);
718 disk_super->write_hits = cpu_to_le32(cmd->stats.write_hits);
719 disk_super->write_misses = cpu_to_le32(cmd->stats.write_misses);
720 __copy_sm_root(cmd, disk_super);
722 return dm_tm_commit(cmd->tm, sblock);
761 struct dm_cache_metadata *cmd;
763 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
764 if (!cmd) {
769 cmd->version = metadata_version;
770 refcount_set(&cmd->ref_count, 1);
771 init_rwsem(&cmd->root_lock);
772 cmd->bdev = bdev;
773 cmd->data_block_size = data_block_size;
774 cmd->cache_blocks = 0;
775 cmd->policy_hint_size = policy_hint_size;
776 cmd->changed = true;
777 cmd->fail_io = false;
779 r = __create_persistent_data_objects(cmd, may_format_device);
781 kfree(cmd);
785 r = __begin_transaction_flags(cmd, clear_clean_shutdown);
787 dm_cache_metadata_close(cmd);
791 return cmd;
804 struct dm_cache_metadata *cmd;
806 list_for_each_entry(cmd, &table, list)
807 if (cmd->bdev == bdev) {
808 refcount_inc(&cmd->ref_count);
809 return cmd;
821 struct dm_cache_metadata *cmd, *cmd2;
824 cmd = lookup(bdev);
827 if (cmd)
828 return cmd;
830 cmd = metadata_open(bdev, data_block_size, may_format_device,
832 if (!IS_ERR(cmd)) {
837 __destroy_persistent_data_objects(cmd, true);
838 kfree(cmd);
841 list_add(&cmd->list, &table);
845 return cmd;
848 static bool same_params(struct dm_cache_metadata *cmd, sector_t data_block_size)
850 if (cmd->data_block_size != data_block_size) {
853 (unsigned long long) cmd->data_block_size);
866 struct dm_cache_metadata *cmd = lookup_or_open(bdev, data_block_size, may_format_device,
869 if (!IS_ERR(cmd) && !same_params(cmd, data_block_size)) {
870 dm_cache_metadata_close(cmd);
874 return cmd;
877 void dm_cache_metadata_close(struct dm_cache_metadata *cmd)
879 if (refcount_dec_and_test(&cmd->ref_count)) {
881 list_del(&cmd->list);
884 if (!cmd->fail_io)
885 __destroy_persistent_data_objects(cmd, true);
886 kfree(cmd);
893 static int block_clean_combined_dirty(struct dm_cache_metadata *cmd, dm_cblock_t b,
901 r = dm_array_get_value(&cmd->info, cmd->root, from_cblock(b), &value);
911 static int blocks_are_clean_combined_dirty(struct dm_cache_metadata *cmd,
919 r = block_clean_combined_dirty(cmd, begin, result);
937 static int blocks_are_clean_separate_dirty(struct dm_cache_metadata *cmd,
945 if (from_cblock(cmd->cache_blocks) == 0)
949 r = dm_bitset_cursor_begin(&cmd->dirty_info, cmd->dirty_root,
950 from_cblock(cmd->cache_blocks), &cmd->dirty_cursor);
956 r = dm_bitset_cursor_skip(&cmd->dirty_cursor, from_cblock(begin));
959 dm_bitset_cursor_end(&cmd->dirty_cursor);
968 dirty_flag = dm_bitset_cursor_get_value(&cmd->dirty_cursor);
972 dm_bitset_cursor_end(&cmd->dirty_cursor);
981 r = dm_bitset_cursor_next(&cmd->dirty_cursor);
984 dm_bitset_cursor_end(&cmd->dirty_cursor);
989 dm_bitset_cursor_end(&cmd->dirty_cursor);
994 static int blocks_are_unmapped_or_clean(struct dm_cache_metadata *cmd,
998 if (separate_dirty_bits(cmd))
999 return blocks_are_clean_separate_dirty(cmd, begin, end, result);
1001 return blocks_are_clean_combined_dirty(cmd, begin, end, result);
1004 static bool cmd_write_lock(struct dm_cache_metadata *cmd)
1006 down_write(&cmd->root_lock);
1007 if (cmd->fail_io || dm_bm_is_read_only(cmd->bm)) {
1008 up_write(&cmd->root_lock);
1014 #define WRITE_LOCK(cmd) \
1016 if (!cmd_write_lock((cmd))) \
1020 #define WRITE_LOCK_VOID(cmd) \
1022 if (!cmd_write_lock((cmd))) \
1026 #define WRITE_UNLOCK(cmd) \
1027 up_write(&(cmd)->root_lock)
1029 static bool cmd_read_lock(struct dm_cache_metadata *cmd)
1031 down_read(&cmd->root_lock);
1032 if (cmd->fail_io) {
1033 up_read(&cmd->root_lock);
1039 #define READ_LOCK(cmd) \
1041 if (!cmd_read_lock((cmd))) \
1045 #define READ_LOCK_VOID(cmd) \
1047 if (!cmd_read_lock((cmd))) \
1051 #define READ_UNLOCK(cmd) \
1052 up_read(&(cmd)->root_lock)
1054 int dm_cache_resize(struct dm_cache_metadata *cmd, dm_cblock_t new_cache_size)
1060 WRITE_LOCK(cmd);
1063 if (from_cblock(new_cache_size) < from_cblock(cmd->cache_blocks)) {
1064 r = blocks_are_unmapped_or_clean(cmd, new_cache_size, cmd->cache_blocks, &clean);
1078 r = dm_array_resize(&cmd->info, cmd->root, from_cblock(cmd->cache_blocks),
1080 &null_mapping, &cmd->root);
1084 if (separate_dirty_bits(cmd)) {
1085 r = dm_bitset_resize(&cmd->dirty_info, cmd->dirty_root,
1086 from_cblock(cmd->cache_blocks), from_cblock(new_cache_size),
1087 false, &cmd->dirty_root);
1092 cmd->cache_blocks = new_cache_size;
1093 cmd->changed = true;
1096 WRITE_UNLOCK(cmd);
1101 int dm_cache_discard_bitset_resize(struct dm_cache_metadata *cmd,
1107 WRITE_LOCK(cmd);
1108 r = dm_bitset_resize(&cmd->discard_info,
1109 cmd->discard_root,
1110 from_dblock(cmd->discard_nr_blocks),
1112 false, &cmd->discard_root);
1114 cmd->discard_block_size = discard_block_size;
1115 cmd->discard_nr_blocks = new_nr_entries;
1118 cmd->changed = true;
1119 WRITE_UNLOCK(cmd);
1124 static int __set_discard(struct dm_cache_metadata *cmd, dm_dblock_t b)
1126 return dm_bitset_set_bit(&cmd->discard_info, cmd->discard_root,
1127 from_dblock(b), &cmd->discard_root);
1130 static int __clear_discard(struct dm_cache_metadata *cmd, dm_dblock_t b)
1132 return dm_bitset_clear_bit(&cmd->discard_info, cmd->discard_root,
1133 from_dblock(b), &cmd->discard_root);
1136 static int __discard(struct dm_cache_metadata *cmd,
1141 r = (discard ? __set_discard : __clear_discard)(cmd, dblock);
1145 cmd->changed = true;
1149 int dm_cache_set_discard(struct dm_cache_metadata *cmd,
1154 WRITE_LOCK(cmd);
1155 r = __discard(cmd, dblock, discard);
1156 WRITE_UNLOCK(cmd);
1161 static int __load_discards(struct dm_cache_metadata *cmd,
1168 if (from_dblock(cmd->discard_nr_blocks) == 0)
1172 if (cmd->clean_when_opened) {
1173 r = dm_bitset_flush(&cmd->discard_info, cmd->discard_root, &cmd->discard_root);
1177 r = dm_bitset_cursor_begin(&cmd->discard_info, cmd->discard_root,
1178 from_dblock(cmd->discard_nr_blocks), &c);
1183 r = fn(context, cmd->discard_block_size, to_dblock(b),
1188 if (b >= (from_dblock(cmd->discard_nr_blocks) - 1))
1199 for (b = 0; b < from_dblock(cmd->discard_nr_blocks); b++) {
1200 r = fn(context, cmd->discard_block_size, to_dblock(b), false);
1209 int dm_cache_load_discards(struct dm_cache_metadata *cmd,
1214 READ_LOCK(cmd);
1215 r = __load_discards(cmd, fn, context);
1216 READ_UNLOCK(cmd);
1221 int dm_cache_size(struct dm_cache_metadata *cmd, dm_cblock_t *result)
1223 READ_LOCK(cmd);
1224 *result = cmd->cache_blocks;
1225 READ_UNLOCK(cmd);
1230 static int __remove(struct dm_cache_metadata *cmd, dm_cblock_t cblock)
1236 r = dm_array_set_value(&cmd->info, cmd->root, from_cblock(cblock),
1237 &value, &cmd->root);
1241 cmd->changed = true;
1245 int dm_cache_remove_mapping(struct dm_cache_metadata *cmd, dm_cblock_t cblock)
1249 WRITE_LOCK(cmd);
1250 r = __remove(cmd, cblock);
1251 WRITE_UNLOCK(cmd);
1256 static int __insert(struct dm_cache_metadata *cmd,
1264 r = dm_array_set_value(&cmd->info, cmd->root, from_cblock(cblock),
1265 &value, &cmd->root);
1269 cmd->changed = true;
1273 int dm_cache_insert_mapping(struct dm_cache_metadata *cmd,
1278 WRITE_LOCK(cmd);
1279 r = __insert(cmd, cblock, oblock);
1280 WRITE_UNLOCK(cmd);
1289 struct dm_cache_metadata *cmd;
1294 static bool policy_unchanged(struct dm_cache_metadata *cmd,
1304 if (strncmp(cmd->policy_name, policy_name, sizeof(cmd->policy_name)))
1310 if (cmd->policy_version[0] != policy_version[0])
1316 if (cmd->policy_hint_size != policy_hint_size)
1322 static bool hints_array_initialized(struct dm_cache_metadata *cmd)
1324 return cmd->hint_root && cmd->policy_hint_size;
1327 static bool hints_array_available(struct dm_cache_metadata *cmd,
1330 return cmd->clean_when_opened && policy_unchanged(cmd, policy) &&
1331 hints_array_initialized(cmd);
1334 static int __load_mapping_v1(struct dm_cache_metadata *cmd,
1361 if (cmd->clean_when_opened)
1375 static int __load_mapping_v2(struct dm_cache_metadata *cmd,
1403 if (cmd->clean_when_opened)
1417 static int __load_mappings(struct dm_cache_metadata *cmd,
1424 bool hints_valid = hints_array_available(cmd, policy);
1426 if (from_cblock(cmd->cache_blocks) == 0)
1430 r = dm_array_cursor_begin(&cmd->info, cmd->root, &cmd->mapping_cursor);
1435 r = dm_array_cursor_begin(&cmd->hint_info, cmd->hint_root, &cmd->hint_cursor);
1437 dm_array_cursor_end(&cmd->mapping_cursor);
1442 if (separate_dirty_bits(cmd)) {
1443 r = dm_bitset_cursor_begin(&cmd->dirty_info, cmd->dirty_root,
1444 from_cblock(cmd->cache_blocks),
1445 &cmd->dirty_cursor);
1447 dm_array_cursor_end(&cmd->hint_cursor);
1448 dm_array_cursor_end(&cmd->mapping_cursor);
1454 if (separate_dirty_bits(cmd))
1455 r = __load_mapping_v2(cmd, cb, hints_valid,
1456 &cmd->mapping_cursor,
1457 &cmd->hint_cursor,
1458 &cmd->dirty_cursor,
1461 r = __load_mapping_v1(cmd, cb, hints_valid,
1462 &cmd->mapping_cursor, &cmd->hint_cursor,
1470 if (cb >= (from_cblock(cmd->cache_blocks) - 1))
1473 r = dm_array_cursor_next(&cmd->mapping_cursor);
1480 r = dm_array_cursor_next(&cmd->hint_cursor);
1482 dm_array_cursor_end(&cmd->hint_cursor);
1487 if (separate_dirty_bits(cmd)) {
1488 r = dm_bitset_cursor_next(&cmd->dirty_cursor);
1496 dm_array_cursor_end(&cmd->mapping_cursor);
1498 dm_array_cursor_end(&cmd->hint_cursor);
1500 if (separate_dirty_bits(cmd))
1501 dm_bitset_cursor_end(&cmd->dirty_cursor);
1506 int dm_cache_load_mappings(struct dm_cache_metadata *cmd,
1512 READ_LOCK(cmd);
1513 r = __load_mappings(cmd, policy, fn, context);
1514 READ_UNLOCK(cmd);
1531 static int __dump_mappings(struct dm_cache_metadata *cmd)
1533 return dm_array_walk(&cmd->info, cmd->root, __dump_mapping, NULL);
1536 void dm_cache_dump(struct dm_cache_metadata *cmd)
1538 READ_LOCK_VOID(cmd);
1539 __dump_mappings(cmd);
1540 READ_UNLOCK(cmd);
1543 int dm_cache_changed_this_transaction(struct dm_cache_metadata *cmd)
1547 READ_LOCK(cmd);
1548 r = cmd->changed;
1549 READ_UNLOCK(cmd);
1554 static int __dirty(struct dm_cache_metadata *cmd, dm_cblock_t cblock, bool dirty)
1561 r = dm_array_get_value(&cmd->info, cmd->root, from_cblock(cblock), &value);
1574 r = dm_array_set_value(&cmd->info, cmd->root, from_cblock(cblock),
1575 &value, &cmd->root);
1579 cmd->changed = true;
1584 static int __set_dirty_bits_v1(struct dm_cache_metadata *cmd, unsigned int nr_bits, unsigned long *bits)
1590 r = __dirty(cmd, to_cblock(i), test_bit(i, bits));
1605 static int __set_dirty_bits_v2(struct dm_cache_metadata *cmd, unsigned int nr_bits, unsigned long *bits)
1610 if (nr_bits != from_cblock(cmd->cache_blocks)) {
1615 r = dm_bitset_del(&cmd->dirty_info, cmd->dirty_root);
1619 cmd->changed = true;
1620 return dm_bitset_new(&cmd->dirty_info, &cmd->dirty_root, nr_bits, is_dirty_callback, bits);
1623 int dm_cache_set_dirty_bits(struct dm_cache_metadata *cmd,
1629 WRITE_LOCK(cmd);
1630 if (separate_dirty_bits(cmd))
1631 r = __set_dirty_bits_v2(cmd, nr_bits, bits);
1633 r = __set_dirty_bits_v1(cmd, nr_bits, bits);
1634 WRITE_UNLOCK(cmd);
1639 void dm_cache_metadata_get_stats(struct dm_cache_metadata *cmd,
1642 READ_LOCK_VOID(cmd);
1643 *stats = cmd->stats;
1644 READ_UNLOCK(cmd);
1647 void dm_cache_metadata_set_stats(struct dm_cache_metadata *cmd,
1650 WRITE_LOCK_VOID(cmd);
1651 cmd->stats = *stats;
1652 WRITE_UNLOCK(cmd);
1655 int dm_cache_commit(struct dm_cache_metadata *cmd, bool clean_shutdown)
1661 WRITE_LOCK(cmd);
1662 if (cmd->fail_io)
1665 r = __commit_transaction(cmd, mutator);
1669 r = __begin_transaction(cmd);
1671 WRITE_UNLOCK(cmd);
1675 int dm_cache_get_free_metadata_block_count(struct dm_cache_metadata *cmd,
1680 READ_LOCK(cmd);
1681 if (!cmd->fail_io)
1682 r = dm_sm_get_nr_free(cmd->metadata_sm, result);
1683 READ_UNLOCK(cmd);
1688 int dm_cache_get_metadata_dev_size(struct dm_cache_metadata *cmd,
1693 READ_LOCK(cmd);
1694 if (!cmd->fail_io)
1695 r = dm_sm_get_nr_blocks(cmd->metadata_sm, result);
1696 READ_UNLOCK(cmd);
1718 static int write_hints(struct dm_cache_metadata *cmd, struct dm_cache_policy *policy)
1726 (strlen(policy_name) > sizeof(cmd->policy_name) - 1))
1729 strscpy(cmd->policy_name, policy_name, sizeof(cmd->policy_name));
1730 memcpy(cmd->policy_version, policy_version, sizeof(cmd->policy_version));
1735 cmd->policy_hint_size = hint_size;
1737 if (cmd->hint_root) {
1738 r = dm_array_del(&cmd->hint_info, cmd->hint_root);
1743 return dm_array_new(&cmd->hint_info, &cmd->hint_root,
1744 from_cblock(cmd->cache_blocks),
1748 int dm_cache_write_hints(struct dm_cache_metadata *cmd, struct dm_cache_policy *policy)
1752 WRITE_LOCK(cmd);
1753 r = write_hints(cmd, policy);
1754 WRITE_UNLOCK(cmd);
1759 int dm_cache_metadata_all_clean(struct dm_cache_metadata *cmd, bool *result)
1763 READ_LOCK(cmd);
1764 r = blocks_are_unmapped_or_clean(cmd, 0, cmd->cache_blocks, result);
1765 READ_UNLOCK(cmd);
1770 void dm_cache_metadata_set_read_only(struct dm_cache_metadata *cmd)
1772 WRITE_LOCK_VOID(cmd);
1773 dm_bm_set_read_only(cmd->bm);
1774 WRITE_UNLOCK(cmd);
1777 void dm_cache_metadata_set_read_write(struct dm_cache_metadata *cmd)
1779 WRITE_LOCK_VOID(cmd);
1780 dm_bm_set_read_write(cmd->bm);
1781 WRITE_UNLOCK(cmd);
1784 int dm_cache_metadata_set_needs_check(struct dm_cache_metadata *cmd)
1790 WRITE_LOCK(cmd);
1791 set_bit(NEEDS_CHECK, &cmd->flags);
1793 r = superblock_lock(cmd, &sblock);
1800 disk_super->flags = cpu_to_le32(cmd->flags);
1805 WRITE_UNLOCK(cmd);
1809 int dm_cache_metadata_needs_check(struct dm_cache_metadata *cmd, bool *result)
1811 READ_LOCK(cmd);
1812 *result = !!test_bit(NEEDS_CHECK, &cmd->flags);
1813 READ_UNLOCK(cmd);
1818 int dm_cache_metadata_abort(struct dm_cache_metadata *cmd)
1823 /* fail_io is double-checked with cmd->root_lock held below */
1824 if (unlikely(cmd->fail_io))
1829 * cmd root_lock to avoid ABBA deadlock that would result (due to life-cycle of
1830 * shrinker associated with the block manager's bufio client vs cmd root_lock).
1831 * - must take shrinker_mutex without holding cmd->root_lock
1833 new_bm = dm_block_manager_create(cmd->bdev, DM_CACHE_METADATA_BLOCK_SIZE << SECTOR_SHIFT,
1836 WRITE_LOCK(cmd);
1837 if (cmd->fail_io) {
1838 WRITE_UNLOCK(cmd);
1842 __destroy_persistent_data_objects(cmd, false);
1843 old_bm = cmd->bm;
1846 cmd->bm = NULL;
1851 cmd->bm = new_bm;
1852 r = __open_or_format_metadata(cmd, false);
1854 cmd->bm = NULL;
1860 cmd->fail_io = true;
1861 WRITE_UNLOCK(cmd);