diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 6ac8d73d4b5141..de51700b909a3b 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -86,88 +86,6 @@ struct async_submit_bio { blk_status_t status; }; -/* - * Lockdep class keys for extent_buffer->lock's in this root. For a given - * eb, the lockdep key is determined by the btrfs_root it belongs to and - * the level the eb occupies in the tree. - * - * Different roots are used for different purposes and may nest inside each - * other and they require separate keysets. As lockdep keys should be - * static, assign keysets according to the purpose of the root as indicated - * by btrfs_root->root_key.objectid. This ensures that all special purpose - * roots have separate keysets. - * - * Lock-nesting across peer nodes is always done with the immediate parent - * node locked thus preventing deadlock. As lockdep doesn't know this, use - * subclass to avoid triggering lockdep warning in such cases. - * - * The key is set by the readpage_end_io_hook after the buffer has passed - * csum validation but before the pages are unlocked. It is also set by - * btrfs_init_new_buffer on freshly allocated blocks. - * - * We also add a check to make sure the highest level of the tree is the - * same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this code - * needs update as well. - */ -#ifdef CONFIG_DEBUG_LOCK_ALLOC -# if BTRFS_MAX_LEVEL != 8 -# error -# endif - -#define DEFINE_LEVEL(stem, level) \ - .names[level] = "btrfs-" stem "-0" #level, - -#define DEFINE_NAME(stem) \ - DEFINE_LEVEL(stem, 0) \ - DEFINE_LEVEL(stem, 1) \ - DEFINE_LEVEL(stem, 2) \ - DEFINE_LEVEL(stem, 3) \ - DEFINE_LEVEL(stem, 4) \ - DEFINE_LEVEL(stem, 5) \ - DEFINE_LEVEL(stem, 6) \ - DEFINE_LEVEL(stem, 7) - -static struct btrfs_lockdep_keyset { - u64 id; /* root objectid */ - /* Longest entry: btrfs-free-space-00 */ - char names[BTRFS_MAX_LEVEL][20]; - struct lock_class_key keys[BTRFS_MAX_LEVEL]; -} btrfs_lockdep_keysets[] = { - { .id = BTRFS_ROOT_TREE_OBJECTID, DEFINE_NAME("root") }, - { .id = BTRFS_EXTENT_TREE_OBJECTID, DEFINE_NAME("extent") }, - { .id = BTRFS_CHUNK_TREE_OBJECTID, DEFINE_NAME("chunk") }, - { .id = BTRFS_DEV_TREE_OBJECTID, DEFINE_NAME("dev") }, - { .id = BTRFS_CSUM_TREE_OBJECTID, DEFINE_NAME("csum") }, - { .id = BTRFS_QUOTA_TREE_OBJECTID, DEFINE_NAME("quota") }, - { .id = BTRFS_TREE_LOG_OBJECTID, DEFINE_NAME("log") }, - { .id = BTRFS_TREE_RELOC_OBJECTID, DEFINE_NAME("treloc") }, - { .id = BTRFS_DATA_RELOC_TREE_OBJECTID, DEFINE_NAME("dreloc") }, - { .id = BTRFS_UUID_TREE_OBJECTID, DEFINE_NAME("uuid") }, - { .id = BTRFS_FREE_SPACE_TREE_OBJECTID, DEFINE_NAME("free-space") }, - { .id = 0, DEFINE_NAME("tree") }, -}; - -#undef DEFINE_LEVEL -#undef DEFINE_NAME - -void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb, - int level) -{ - struct btrfs_lockdep_keyset *ks; - - BUG_ON(level >= ARRAY_SIZE(ks->keys)); - - /* find the matching keyset, id 0 is the default entry */ - for (ks = btrfs_lockdep_keysets; ks->id; ks++) - if (ks->id == objectid) - break; - - lockdep_set_class_and_name(&eb->lock, - &ks->keys[level], ks->names[level]); -} - -#endif - /* * Compute the csum of a btree block and store the result to provided buffer. */ diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h index 8993b428e09ceb..47ad8e0a2d33f6 100644 --- a/fs/btrfs/disk-io.h +++ b/fs/btrfs/disk-io.h @@ -137,14 +137,4 @@ int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags); int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid); int btrfs_init_root_free_objectid(struct btrfs_root *root); -#ifdef CONFIG_DEBUG_LOCK_ALLOC -void btrfs_set_buffer_lockdep_class(u64 objectid, - struct extent_buffer *eb, int level); -#else -static inline void btrfs_set_buffer_lockdep_class(u64 objectid, - struct extent_buffer *eb, int level) -{ -} -#endif - #endif diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c index 33461b4f9c8b5c..5747c63929df73 100644 --- a/fs/btrfs/locking.c +++ b/fs/btrfs/locking.c @@ -13,6 +13,86 @@ #include "extent_io.h" #include "locking.h" +/* + * Lockdep class keys for extent_buffer->lock's in this root. For a given + * eb, the lockdep key is determined by the btrfs_root it belongs to and + * the level the eb occupies in the tree. + * + * Different roots are used for different purposes and may nest inside each + * other and they require separate keysets. As lockdep keys should be + * static, assign keysets according to the purpose of the root as indicated + * by btrfs_root->root_key.objectid. This ensures that all special purpose + * roots have separate keysets. + * + * Lock-nesting across peer nodes is always done with the immediate parent + * node locked thus preventing deadlock. As lockdep doesn't know this, use + * subclass to avoid triggering lockdep warning in such cases. + * + * The key is set by the readpage_end_io_hook after the buffer has passed + * csum validation but before the pages are unlocked. It is also set by + * btrfs_init_new_buffer on freshly allocated blocks. + * + * We also add a check to make sure the highest level of the tree is the + * same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this code + * needs update as well. + */ +#ifdef CONFIG_DEBUG_LOCK_ALLOC +#if BTRFS_MAX_LEVEL != 8 +#error +#endif + +#define DEFINE_LEVEL(stem, level) \ + .names[level] = "btrfs-" stem "-0" #level, + +#define DEFINE_NAME(stem) \ + DEFINE_LEVEL(stem, 0) \ + DEFINE_LEVEL(stem, 1) \ + DEFINE_LEVEL(stem, 2) \ + DEFINE_LEVEL(stem, 3) \ + DEFINE_LEVEL(stem, 4) \ + DEFINE_LEVEL(stem, 5) \ + DEFINE_LEVEL(stem, 6) \ + DEFINE_LEVEL(stem, 7) + +static struct btrfs_lockdep_keyset { + u64 id; /* root objectid */ + /* Longest entry: btrfs-free-space-00 */ + char names[BTRFS_MAX_LEVEL][20]; + struct lock_class_key keys[BTRFS_MAX_LEVEL]; +} btrfs_lockdep_keysets[] = { + { .id = BTRFS_ROOT_TREE_OBJECTID, DEFINE_NAME("root") }, + { .id = BTRFS_EXTENT_TREE_OBJECTID, DEFINE_NAME("extent") }, + { .id = BTRFS_CHUNK_TREE_OBJECTID, DEFINE_NAME("chunk") }, + { .id = BTRFS_DEV_TREE_OBJECTID, DEFINE_NAME("dev") }, + { .id = BTRFS_CSUM_TREE_OBJECTID, DEFINE_NAME("csum") }, + { .id = BTRFS_QUOTA_TREE_OBJECTID, DEFINE_NAME("quota") }, + { .id = BTRFS_TREE_LOG_OBJECTID, DEFINE_NAME("log") }, + { .id = BTRFS_TREE_RELOC_OBJECTID, DEFINE_NAME("treloc") }, + { .id = BTRFS_DATA_RELOC_TREE_OBJECTID, DEFINE_NAME("dreloc") }, + { .id = BTRFS_UUID_TREE_OBJECTID, DEFINE_NAME("uuid") }, + { .id = BTRFS_FREE_SPACE_TREE_OBJECTID, DEFINE_NAME("free-space") }, + { .id = 0, DEFINE_NAME("tree") }, +}; + +#undef DEFINE_LEVEL +#undef DEFINE_NAME + +void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb, int level) +{ + struct btrfs_lockdep_keyset *ks; + + BUG_ON(level >= ARRAY_SIZE(ks->keys)); + + /* Find the matching keyset, id 0 is the default entry */ + for (ks = btrfs_lockdep_keysets; ks->id; ks++) + if (ks->id == objectid) + break; + + lockdep_set_class_and_name(&eb->lock, &ks->keys[level], ks->names[level]); +} + +#endif + /* * Extent buffer locking * ===================== diff --git a/fs/btrfs/locking.h b/fs/btrfs/locking.h index bbc45534ae9a60..b21372cab84096 100644 --- a/fs/btrfs/locking.h +++ b/fs/btrfs/locking.h @@ -131,4 +131,13 @@ void btrfs_drew_write_unlock(struct btrfs_drew_lock *lock); void btrfs_drew_read_lock(struct btrfs_drew_lock *lock); void btrfs_drew_read_unlock(struct btrfs_drew_lock *lock); +#ifdef CONFIG_DEBUG_LOCK_ALLOC +void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb, int level); +#else +static inline void btrfs_set_buffer_lockdep_class(u64 objectid, + struct extent_buffer *eb, int level) +{ +} +#endif + #endif