};
/*
- * 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.
*/
static void csum_tree_block(struct extent_buffer *buf, u8 *result)
int __init btrfs_end_io_wq_init(void);
void __cold btrfs_end_io_wq_exit(void);
-#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
#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
* =====================
*
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