Lines Matching refs:cmd
237 static int superblock_read_lock(struct dm_cache_metadata *cmd,
240 return dm_bm_read_lock(cmd->bm, CACHE_SUPERBLOCK_LOCATION,
244 static int superblock_lock_zero(struct dm_cache_metadata *cmd,
247 return dm_bm_write_lock_zero(cmd->bm, CACHE_SUPERBLOCK_LOCATION,
251 static int superblock_lock(struct dm_cache_metadata *cmd,
254 return dm_bm_write_lock(cmd->bm, CACHE_SUPERBLOCK_LOCATION,
289 static void __setup_mapping_info(struct dm_cache_metadata *cmd)
298 dm_array_info_init(&cmd->info, cmd->tm, &vt);
300 if (cmd->policy_hint_size) {
302 dm_array_info_init(&cmd->hint_info, cmd->tm, &vt);
306 static int __save_sm_root(struct dm_cache_metadata *cmd)
311 r = dm_sm_root_size(cmd->metadata_sm, &metadata_len);
315 return dm_sm_copy_root(cmd->metadata_sm, &cmd->metadata_space_map_root,
319 static void __copy_sm_root(struct dm_cache_metadata *cmd,
323 &cmd->metadata_space_map_root,
324 sizeof(cmd->metadata_space_map_root));
327 static bool separate_dirty_bits(struct dm_cache_metadata *cmd)
329 return cmd->version >= 2;
332 static int __write_initial_superblock(struct dm_cache_metadata *cmd)
337 sector_t bdev_size = i_size_read(cmd->bdev->bd_inode) >> SECTOR_SHIFT;
343 r = dm_tm_pre_commit(cmd->tm);
351 r = __save_sm_root(cmd);
355 r = superblock_lock_zero(cmd, &sblock);
363 disk_super->version = cpu_to_le32(cmd->version);
368 __copy_sm_root(cmd, disk_super);
370 disk_super->mapping_root = cpu_to_le64(cmd->root);
371 disk_super->hint_root = cpu_to_le64(cmd->hint_root);
372 disk_super->discard_root = cpu_to_le64(cmd->discard_root);
373 disk_super->discard_block_size = cpu_to_le64(cmd->discard_block_size);
374 disk_super->discard_nr_blocks = cpu_to_le64(from_dblock(cmd->discard_nr_blocks));
376 disk_super->data_block_size = cpu_to_le32(cmd->data_block_size);
384 if (separate_dirty_bits(cmd))
385 disk_super->dirty_root = cpu_to_le64(cmd->dirty_root);
387 return dm_tm_commit(cmd->tm, sblock);
390 static int __format_metadata(struct dm_cache_metadata *cmd)
394 r = dm_tm_create_with_sm(cmd->bm, CACHE_SUPERBLOCK_LOCATION,
395 &cmd->tm, &cmd->metadata_sm);
401 __setup_mapping_info(cmd);
403 r = dm_array_empty(&cmd->info, &cmd->root);
407 if (separate_dirty_bits(cmd)) {
408 dm_disk_bitset_init(cmd->tm, &cmd->dirty_info);
409 r = dm_bitset_empty(&cmd->dirty_info, &cmd->dirty_root);
414 dm_disk_bitset_init(cmd->tm, &cmd->discard_info);
415 r = dm_bitset_empty(&cmd->discard_info, &cmd->discard_root);
419 cmd->discard_block_size = 0;
420 cmd->discard_nr_blocks = 0;
422 r = __write_initial_superblock(cmd);
426 cmd->clean_when_opened = true;
430 dm_tm_destroy(cmd->tm);
431 dm_sm_destroy(cmd->metadata_sm);
437 struct dm_cache_metadata *cmd)
452 if (get_disk_ro(cmd->bdev->bd_disk))
465 static int __open_metadata(struct dm_cache_metadata *cmd)
472 r = superblock_read_lock(cmd, &sblock);
481 if (le32_to_cpu(disk_super->data_block_size) != cmd->data_block_size) {
484 (unsigned long long)cmd->data_block_size);
489 r = __check_incompat_features(disk_super, cmd);
493 r = dm_tm_open_with_sm(cmd->bm, CACHE_SUPERBLOCK_LOCATION,
496 &cmd->tm, &cmd->metadata_sm);
502 __setup_mapping_info(cmd);
503 dm_disk_bitset_init(cmd->tm, &cmd->dirty_info);
504 dm_disk_bitset_init(cmd->tm, &cmd->discard_info);
506 cmd->clean_when_opened = test_bit(CLEAN_SHUTDOWN, &sb_flags);
516 static int __open_or_format_metadata(struct dm_cache_metadata *cmd,
522 r = __superblock_all_zeroes(cmd->bm, &unformatted);
527 return format_device ? __format_metadata(cmd) : -EPERM;
529 return __open_metadata(cmd);
532 static int __create_persistent_data_objects(struct dm_cache_metadata *cmd,
536 cmd->bm = dm_block_manager_create(cmd->bdev, DM_CACHE_METADATA_BLOCK_SIZE << SECTOR_SHIFT,
538 if (IS_ERR(cmd->bm)) {
540 r = PTR_ERR(cmd->bm);
541 cmd->bm = NULL;
545 r = __open_or_format_metadata(cmd, may_format_device);
547 dm_block_manager_destroy(cmd->bm);
548 cmd->bm = NULL;
554 static void __destroy_persistent_data_objects(struct dm_cache_metadata *cmd,
557 dm_sm_destroy(cmd->metadata_sm);
558 dm_tm_destroy(cmd->tm);
560 dm_block_manager_destroy(cmd->bm);
584 static void read_superblock_fields(struct dm_cache_metadata *cmd,
587 cmd->version = le32_to_cpu(disk_super->version);
588 cmd->flags = le32_to_cpu(disk_super->flags);
589 cmd->root = le64_to_cpu(disk_super->mapping_root);
590 cmd->hint_root = le64_to_cpu(disk_super->hint_root);
591 cmd->discard_root = le64_to_cpu(disk_super->discard_root);
592 cmd->discard_block_size = le64_to_cpu(disk_super->discard_block_size);
593 cmd->discard_nr_blocks = to_dblock(le64_to_cpu(disk_super->discard_nr_blocks));
594 cmd->data_block_size = le32_to_cpu(disk_super->data_block_size);
595 cmd->cache_blocks = to_cblock(le32_to_cpu(disk_super->cache_blocks));
596 strncpy(cmd->policy_name, disk_super->policy_name, sizeof(cmd->policy_name));
597 cmd->policy_version[0] = le32_to_cpu(disk_super->policy_version[0]);
598 cmd->policy_version[1] = le32_to_cpu(disk_super->policy_version[1]);
599 cmd->policy_version[2] = le32_to_cpu(disk_super->policy_version[2]);
600 cmd->policy_hint_size = le32_to_cpu(disk_super->policy_hint_size);
602 cmd->stats.read_hits = le32_to_cpu(disk_super->read_hits);
603 cmd->stats.read_misses = le32_to_cpu(disk_super->read_misses);
604 cmd->stats.write_hits = le32_to_cpu(disk_super->write_hits);
605 cmd->stats.write_misses = le32_to_cpu(disk_super->write_misses);
607 if (separate_dirty_bits(cmd))
608 cmd->dirty_root = le64_to_cpu(disk_super->dirty_root);
610 cmd->changed = false;
616 static int __begin_transaction_flags(struct dm_cache_metadata *cmd,
623 r = superblock_lock(cmd, &sblock);
629 read_superblock_fields(cmd, disk_super);
632 return dm_bm_flush(cmd->bm);
635 static int __begin_transaction(struct dm_cache_metadata *cmd)
645 r = superblock_read_lock(cmd, &sblock);
650 read_superblock_fields(cmd, disk_super);
656 static int __commit_transaction(struct dm_cache_metadata *cmd,
668 if (separate_dirty_bits(cmd)) {
669 r = dm_bitset_flush(&cmd->dirty_info, cmd->dirty_root,
670 &cmd->dirty_root);
675 r = dm_bitset_flush(&cmd->discard_info, cmd->discard_root,
676 &cmd->discard_root);
680 r = dm_tm_pre_commit(cmd->tm);
684 r = __save_sm_root(cmd);
688 r = superblock_lock(cmd, &sblock);
694 disk_super->flags = cpu_to_le32(cmd->flags);
698 disk_super->mapping_root = cpu_to_le64(cmd->root);
699 if (separate_dirty_bits(cmd))
700 disk_super->dirty_root = cpu_to_le64(cmd->dirty_root);
701 disk_super->hint_root = cpu_to_le64(cmd->hint_root);
702 disk_super->discard_root = cpu_to_le64(cmd->discard_root);
703 disk_super->discard_block_size = cpu_to_le64(cmd->discard_block_size);
704 disk_super->discard_nr_blocks = cpu_to_le64(from_dblock(cmd->discard_nr_blocks));
705 disk_super->cache_blocks = cpu_to_le32(from_cblock(cmd->cache_blocks));
706 strncpy(disk_super->policy_name, cmd->policy_name, sizeof(disk_super->policy_name));
707 disk_super->policy_version[0] = cpu_to_le32(cmd->policy_version[0]);
708 disk_super->policy_version[1] = cpu_to_le32(cmd->policy_version[1]);
709 disk_super->policy_version[2] = cpu_to_le32(cmd->policy_version[2]);
710 disk_super->policy_hint_size = cpu_to_le32(cmd->policy_hint_size);
712 disk_super->read_hits = cpu_to_le32(cmd->stats.read_hits);
713 disk_super->read_misses = cpu_to_le32(cmd->stats.read_misses);
714 disk_super->write_hits = cpu_to_le32(cmd->stats.write_hits);
715 disk_super->write_misses = cpu_to_le32(cmd->stats.write_misses);
716 __copy_sm_root(cmd, disk_super);
718 return dm_tm_commit(cmd->tm, sblock);
755 struct dm_cache_metadata *cmd;
757 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
758 if (!cmd) {
763 cmd->version = metadata_version;
764 refcount_set(&cmd->ref_count, 1);
765 init_rwsem(&cmd->root_lock);
766 cmd->bdev = bdev;
767 cmd->data_block_size = data_block_size;
768 cmd->cache_blocks = 0;
769 cmd->policy_hint_size = policy_hint_size;
770 cmd->changed = true;
771 cmd->fail_io = false;
773 r = __create_persistent_data_objects(cmd, may_format_device);
775 kfree(cmd);
779 r = __begin_transaction_flags(cmd, clear_clean_shutdown);
781 dm_cache_metadata_close(cmd);
785 return cmd;
798 struct dm_cache_metadata *cmd;
800 list_for_each_entry(cmd, &table, list)
801 if (cmd->bdev == bdev) {
802 refcount_inc(&cmd->ref_count);
803 return cmd;
815 struct dm_cache_metadata *cmd, *cmd2;
818 cmd = lookup(bdev);
821 if (cmd)
822 return cmd;
824 cmd = metadata_open(bdev, data_block_size, may_format_device,
826 if (!IS_ERR(cmd)) {
831 __destroy_persistent_data_objects(cmd, true);
832 kfree(cmd);
835 list_add(&cmd->list, &table);
839 return cmd;
842 static bool same_params(struct dm_cache_metadata *cmd, sector_t data_block_size)
844 if (cmd->data_block_size != data_block_size) {
847 (unsigned long long) cmd->data_block_size);
860 struct dm_cache_metadata *cmd = lookup_or_open(bdev, data_block_size, may_format_device,
863 if (!IS_ERR(cmd) && !same_params(cmd, data_block_size)) {
864 dm_cache_metadata_close(cmd);
868 return cmd;
871 void dm_cache_metadata_close(struct dm_cache_metadata *cmd)
873 if (refcount_dec_and_test(&cmd->ref_count)) {
875 list_del(&cmd->list);
878 if (!cmd->fail_io)
879 __destroy_persistent_data_objects(cmd, true);
880 kfree(cmd);
887 static int block_clean_combined_dirty(struct dm_cache_metadata *cmd, dm_cblock_t b,
895 r = dm_array_get_value(&cmd->info, cmd->root, from_cblock(b), &value);
905 static int blocks_are_clean_combined_dirty(struct dm_cache_metadata *cmd,
913 r = block_clean_combined_dirty(cmd, begin, result);
931 static int blocks_are_clean_separate_dirty(struct dm_cache_metadata *cmd,
939 if (from_cblock(cmd->cache_blocks) == 0)
943 r = dm_bitset_cursor_begin(&cmd->dirty_info, cmd->dirty_root,
944 from_cblock(cmd->cache_blocks), &cmd->dirty_cursor);
950 r = dm_bitset_cursor_skip(&cmd->dirty_cursor, from_cblock(begin));
953 dm_bitset_cursor_end(&cmd->dirty_cursor);
962 dirty_flag = dm_bitset_cursor_get_value(&cmd->dirty_cursor);
966 dm_bitset_cursor_end(&cmd->dirty_cursor);
975 r = dm_bitset_cursor_next(&cmd->dirty_cursor);
978 dm_bitset_cursor_end(&cmd->dirty_cursor);
983 dm_bitset_cursor_end(&cmd->dirty_cursor);
988 static int blocks_are_unmapped_or_clean(struct dm_cache_metadata *cmd,
992 if (separate_dirty_bits(cmd))
993 return blocks_are_clean_separate_dirty(cmd, begin, end, result);
995 return blocks_are_clean_combined_dirty(cmd, begin, end, result);
998 static bool cmd_write_lock(struct dm_cache_metadata *cmd)
1000 down_write(&cmd->root_lock);
1001 if (cmd->fail_io || dm_bm_is_read_only(cmd->bm)) {
1002 up_write(&cmd->root_lock);
1008 #define WRITE_LOCK(cmd) \
1010 if (!cmd_write_lock((cmd))) \
1014 #define WRITE_LOCK_VOID(cmd) \
1016 if (!cmd_write_lock((cmd))) \
1020 #define WRITE_UNLOCK(cmd) \
1021 up_write(&(cmd)->root_lock)
1023 static bool cmd_read_lock(struct dm_cache_metadata *cmd)
1025 down_read(&cmd->root_lock);
1026 if (cmd->fail_io) {
1027 up_read(&cmd->root_lock);
1033 #define READ_LOCK(cmd) \
1035 if (!cmd_read_lock((cmd))) \
1039 #define READ_LOCK_VOID(cmd) \
1041 if (!cmd_read_lock((cmd))) \
1045 #define READ_UNLOCK(cmd) \
1046 up_read(&(cmd)->root_lock)
1048 int dm_cache_resize(struct dm_cache_metadata *cmd, dm_cblock_t new_cache_size)
1054 WRITE_LOCK(cmd);
1057 if (from_cblock(new_cache_size) < from_cblock(cmd->cache_blocks)) {
1058 r = blocks_are_unmapped_or_clean(cmd, new_cache_size, cmd->cache_blocks, &clean);
1072 r = dm_array_resize(&cmd->info, cmd->root, from_cblock(cmd->cache_blocks),
1074 &null_mapping, &cmd->root);
1078 if (separate_dirty_bits(cmd)) {
1079 r = dm_bitset_resize(&cmd->dirty_info, cmd->dirty_root,
1080 from_cblock(cmd->cache_blocks), from_cblock(new_cache_size),
1081 false, &cmd->dirty_root);
1086 cmd->cache_blocks = new_cache_size;
1087 cmd->changed = true;
1090 WRITE_UNLOCK(cmd);
1095 int dm_cache_discard_bitset_resize(struct dm_cache_metadata *cmd,
1101 WRITE_LOCK(cmd);
1102 r = dm_bitset_resize(&cmd->discard_info,
1103 cmd->discard_root,
1104 from_dblock(cmd->discard_nr_blocks),
1106 false, &cmd->discard_root);
1108 cmd->discard_block_size = discard_block_size;
1109 cmd->discard_nr_blocks = new_nr_entries;
1112 cmd->changed = true;
1113 WRITE_UNLOCK(cmd);
1118 static int __set_discard(struct dm_cache_metadata *cmd, dm_dblock_t b)
1120 return dm_bitset_set_bit(&cmd->discard_info, cmd->discard_root,
1121 from_dblock(b), &cmd->discard_root);
1124 static int __clear_discard(struct dm_cache_metadata *cmd, dm_dblock_t b)
1126 return dm_bitset_clear_bit(&cmd->discard_info, cmd->discard_root,
1127 from_dblock(b), &cmd->discard_root);
1130 static int __discard(struct dm_cache_metadata *cmd,
1135 r = (discard ? __set_discard : __clear_discard)(cmd, dblock);
1139 cmd->changed = true;
1143 int dm_cache_set_discard(struct dm_cache_metadata *cmd,
1148 WRITE_LOCK(cmd);
1149 r = __discard(cmd, dblock, discard);
1150 WRITE_UNLOCK(cmd);
1155 static int __load_discards(struct dm_cache_metadata *cmd,
1162 if (from_dblock(cmd->discard_nr_blocks) == 0)
1166 if (cmd->clean_when_opened) {
1167 r = dm_bitset_flush(&cmd->discard_info, cmd->discard_root, &cmd->discard_root);
1171 r = dm_bitset_cursor_begin(&cmd->discard_info, cmd->discard_root,
1172 from_dblock(cmd->discard_nr_blocks), &c);
1177 r = fn(context, cmd->discard_block_size, to_dblock(b),
1182 if (b >= (from_dblock(cmd->discard_nr_blocks) - 1))
1193 for (b = 0; b < from_dblock(cmd->discard_nr_blocks); b++) {
1194 r = fn(context, cmd->discard_block_size, to_dblock(b), false);
1203 int dm_cache_load_discards(struct dm_cache_metadata *cmd,
1208 READ_LOCK(cmd);
1209 r = __load_discards(cmd, fn, context);
1210 READ_UNLOCK(cmd);
1215 int dm_cache_size(struct dm_cache_metadata *cmd, dm_cblock_t *result)
1217 READ_LOCK(cmd);
1218 *result = cmd->cache_blocks;
1219 READ_UNLOCK(cmd);
1224 static int __remove(struct dm_cache_metadata *cmd, dm_cblock_t cblock)
1230 r = dm_array_set_value(&cmd->info, cmd->root, from_cblock(cblock),
1231 &value, &cmd->root);
1235 cmd->changed = true;
1239 int dm_cache_remove_mapping(struct dm_cache_metadata *cmd, dm_cblock_t cblock)
1243 WRITE_LOCK(cmd);
1244 r = __remove(cmd, cblock);
1245 WRITE_UNLOCK(cmd);
1250 static int __insert(struct dm_cache_metadata *cmd,
1257 r = dm_array_set_value(&cmd->info, cmd->root, from_cblock(cblock),
1258 &value, &cmd->root);
1262 cmd->changed = true;
1266 int dm_cache_insert_mapping(struct dm_cache_metadata *cmd,
1271 WRITE_LOCK(cmd);
1272 r = __insert(cmd, cblock, oblock);
1273 WRITE_UNLOCK(cmd);
1282 struct dm_cache_metadata *cmd;
1287 static bool policy_unchanged(struct dm_cache_metadata *cmd,
1297 if (strncmp(cmd->policy_name, policy_name, sizeof(cmd->policy_name)))
1303 if (cmd->policy_version[0] != policy_version[0])
1309 if (cmd->policy_hint_size != policy_hint_size)
1315 static bool hints_array_initialized(struct dm_cache_metadata *cmd)
1317 return cmd->hint_root && cmd->policy_hint_size;
1320 static bool hints_array_available(struct dm_cache_metadata *cmd,
1323 return cmd->clean_when_opened && policy_unchanged(cmd, policy) &&
1324 hints_array_initialized(cmd);
1327 static int __load_mapping_v1(struct dm_cache_metadata *cmd,
1354 if (cmd->clean_when_opened)
1368 static int __load_mapping_v2(struct dm_cache_metadata *cmd,
1396 if (cmd->clean_when_opened)
1410 static int __load_mappings(struct dm_cache_metadata *cmd,
1417 bool hints_valid = hints_array_available(cmd, policy);
1419 if (from_cblock(cmd->cache_blocks) == 0)
1423 r = dm_array_cursor_begin(&cmd->info, cmd->root, &cmd->mapping_cursor);
1428 r = dm_array_cursor_begin(&cmd->hint_info, cmd->hint_root, &cmd->hint_cursor);
1430 dm_array_cursor_end(&cmd->mapping_cursor);
1435 if (separate_dirty_bits(cmd)) {
1436 r = dm_bitset_cursor_begin(&cmd->dirty_info, cmd->dirty_root,
1437 from_cblock(cmd->cache_blocks),
1438 &cmd->dirty_cursor);
1440 dm_array_cursor_end(&cmd->hint_cursor);
1441 dm_array_cursor_end(&cmd->mapping_cursor);
1447 if (separate_dirty_bits(cmd))
1448 r = __load_mapping_v2(cmd, cb, hints_valid,
1449 &cmd->mapping_cursor,
1450 &cmd->hint_cursor,
1451 &cmd->dirty_cursor,
1454 r = __load_mapping_v1(cmd, cb, hints_valid,
1455 &cmd->mapping_cursor, &cmd->hint_cursor,
1463 if (cb >= (from_cblock(cmd->cache_blocks) - 1))
1466 r = dm_array_cursor_next(&cmd->mapping_cursor);
1473 r = dm_array_cursor_next(&cmd->hint_cursor);
1475 dm_array_cursor_end(&cmd->hint_cursor);
1480 if (separate_dirty_bits(cmd)) {
1481 r = dm_bitset_cursor_next(&cmd->dirty_cursor);
1489 dm_array_cursor_end(&cmd->mapping_cursor);
1491 dm_array_cursor_end(&cmd->hint_cursor);
1493 if (separate_dirty_bits(cmd))
1494 dm_bitset_cursor_end(&cmd->dirty_cursor);
1499 int dm_cache_load_mappings(struct dm_cache_metadata *cmd,
1505 READ_LOCK(cmd);
1506 r = __load_mappings(cmd, policy, fn, context);
1507 READ_UNLOCK(cmd);
1525 static int __dump_mappings(struct dm_cache_metadata *cmd)
1527 return dm_array_walk(&cmd->info, cmd->root, __dump_mapping, NULL);
1530 void dm_cache_dump(struct dm_cache_metadata *cmd)
1532 READ_LOCK_VOID(cmd);
1533 __dump_mappings(cmd);
1534 READ_UNLOCK(cmd);
1537 int dm_cache_changed_this_transaction(struct dm_cache_metadata *cmd)
1541 READ_LOCK(cmd);
1542 r = cmd->changed;
1543 READ_UNLOCK(cmd);
1548 static int __dirty(struct dm_cache_metadata *cmd, dm_cblock_t cblock, bool dirty)
1555 r = dm_array_get_value(&cmd->info, cmd->root, from_cblock(cblock), &value);
1568 r = dm_array_set_value(&cmd->info, cmd->root, from_cblock(cblock),
1569 &value, &cmd->root);
1573 cmd->changed = true;
1578 static int __set_dirty_bits_v1(struct dm_cache_metadata *cmd, unsigned nr_bits, unsigned long *bits)
1583 r = __dirty(cmd, to_cblock(i), test_bit(i, bits));
1598 static int __set_dirty_bits_v2(struct dm_cache_metadata *cmd, unsigned nr_bits, unsigned long *bits)
1603 if (nr_bits != from_cblock(cmd->cache_blocks)) {
1608 r = dm_bitset_del(&cmd->dirty_info, cmd->dirty_root);
1612 cmd->changed = true;
1613 return dm_bitset_new(&cmd->dirty_info, &cmd->dirty_root, nr_bits, is_dirty_callback, bits);
1616 int dm_cache_set_dirty_bits(struct dm_cache_metadata *cmd,
1622 WRITE_LOCK(cmd);
1623 if (separate_dirty_bits(cmd))
1624 r = __set_dirty_bits_v2(cmd, nr_bits, bits);
1626 r = __set_dirty_bits_v1(cmd, nr_bits, bits);
1627 WRITE_UNLOCK(cmd);
1632 void dm_cache_metadata_get_stats(struct dm_cache_metadata *cmd,
1635 READ_LOCK_VOID(cmd);
1636 *stats = cmd->stats;
1637 READ_UNLOCK(cmd);
1640 void dm_cache_metadata_set_stats(struct dm_cache_metadata *cmd,
1643 WRITE_LOCK_VOID(cmd);
1644 cmd->stats = *stats;
1645 WRITE_UNLOCK(cmd);
1648 int dm_cache_commit(struct dm_cache_metadata *cmd, bool clean_shutdown)
1654 WRITE_LOCK(cmd);
1655 if (cmd->fail_io)
1658 r = __commit_transaction(cmd, mutator);
1662 r = __begin_transaction(cmd);
1664 WRITE_UNLOCK(cmd);
1668 int dm_cache_get_free_metadata_block_count(struct dm_cache_metadata *cmd,
1673 READ_LOCK(cmd);
1674 if (!cmd->fail_io)
1675 r = dm_sm_get_nr_free(cmd->metadata_sm, result);
1676 READ_UNLOCK(cmd);
1681 int dm_cache_get_metadata_dev_size(struct dm_cache_metadata *cmd,
1686 READ_LOCK(cmd);
1687 if (!cmd->fail_io)
1688 r = dm_sm_get_nr_blocks(cmd->metadata_sm, result);
1689 READ_UNLOCK(cmd);
1711 static int write_hints(struct dm_cache_metadata *cmd, struct dm_cache_policy *policy)
1719 (strlen(policy_name) > sizeof(cmd->policy_name) - 1))
1722 strncpy(cmd->policy_name, policy_name, sizeof(cmd->policy_name));
1723 memcpy(cmd->policy_version, policy_version, sizeof(cmd->policy_version));
1728 cmd->policy_hint_size = hint_size;
1730 if (cmd->hint_root) {
1731 r = dm_array_del(&cmd->hint_info, cmd->hint_root);
1736 return dm_array_new(&cmd->hint_info, &cmd->hint_root,
1737 from_cblock(cmd->cache_blocks),
1741 int dm_cache_write_hints(struct dm_cache_metadata *cmd, struct dm_cache_policy *policy)
1745 WRITE_LOCK(cmd);
1746 r = write_hints(cmd, policy);
1747 WRITE_UNLOCK(cmd);
1752 int dm_cache_metadata_all_clean(struct dm_cache_metadata *cmd, bool *result)
1756 READ_LOCK(cmd);
1757 r = blocks_are_unmapped_or_clean(cmd, 0, cmd->cache_blocks, result);
1758 READ_UNLOCK(cmd);
1763 void dm_cache_metadata_set_read_only(struct dm_cache_metadata *cmd)
1765 WRITE_LOCK_VOID(cmd);
1766 dm_bm_set_read_only(cmd->bm);
1767 WRITE_UNLOCK(cmd);
1770 void dm_cache_metadata_set_read_write(struct dm_cache_metadata *cmd)
1772 WRITE_LOCK_VOID(cmd);
1773 dm_bm_set_read_write(cmd->bm);
1774 WRITE_UNLOCK(cmd);
1777 int dm_cache_metadata_set_needs_check(struct dm_cache_metadata *cmd)
1783 WRITE_LOCK(cmd);
1784 set_bit(NEEDS_CHECK, &cmd->flags);
1786 r = superblock_lock(cmd, &sblock);
1793 disk_super->flags = cpu_to_le32(cmd->flags);
1798 WRITE_UNLOCK(cmd);
1802 int dm_cache_metadata_needs_check(struct dm_cache_metadata *cmd, bool *result)
1804 READ_LOCK(cmd);
1805 *result = !!test_bit(NEEDS_CHECK, &cmd->flags);
1806 READ_UNLOCK(cmd);
1811 int dm_cache_metadata_abort(struct dm_cache_metadata *cmd)
1816 /* fail_io is double-checked with cmd->root_lock held below */
1817 if (unlikely(cmd->fail_io))
1822 * cmd root_lock to avoid ABBA deadlock that would result (due to life-cycle of
1823 * shrinker associated with the block manager's bufio client vs cmd root_lock).
1824 * - must take shrinker_rwsem without holding cmd->root_lock
1826 new_bm = dm_block_manager_create(cmd->bdev, DM_CACHE_METADATA_BLOCK_SIZE << SECTOR_SHIFT,
1829 WRITE_LOCK(cmd);
1830 if (cmd->fail_io) {
1831 WRITE_UNLOCK(cmd);
1835 __destroy_persistent_data_objects(cmd, false);
1836 old_bm = cmd->bm;
1839 cmd->bm = NULL;
1844 cmd->bm = new_bm;
1845 r = __open_or_format_metadata(cmd, false);
1847 cmd->bm = NULL;
1853 cmd->fail_io = true;
1854 WRITE_UNLOCK(cmd);