fs/btrfs/extent-io-tree.h

Source file repositories/reference/linux-study-clean/fs/btrfs/extent-io-tree.h

File Facts

System
Linux kernel
Corpus path
fs/btrfs/extent-io-tree.h
Extension
.h
Size
8263 bytes
Lines
245
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct extent_io_tree {
	struct rb_root state;
	/*
	 * The fs_info is needed for trace points, a tree attached to an inode
	 * needs the inode.
	 *
	 * owner == IO_TREE_INODE_IO - then inode is valid and fs_info can be
	 *                             accessed as inode->root->fs_info
	 */
	union {
		struct btrfs_fs_info *fs_info;
		struct btrfs_inode *inode;
	};

	/* Who owns this io tree, should be one of IO_TREE_* */
	u8 owner;

	spinlock_t lock;
};

struct extent_state {
	u64 start;
	u64 end; /* inclusive */
	struct rb_node rb_node;

	/* ADD NEW ELEMENTS AFTER THIS */
	wait_queue_head_t wq;
	refcount_t refs;
	u32 state;

#ifdef CONFIG_BTRFS_DEBUG
	struct list_head leak_list;
#endif
};

const struct btrfs_inode *btrfs_extent_io_tree_to_inode(const struct extent_io_tree *tree);
const struct btrfs_fs_info *btrfs_extent_io_tree_to_fs_info(const struct extent_io_tree *tree);

void btrfs_extent_io_tree_init(struct btrfs_fs_info *fs_info,
			       struct extent_io_tree *tree, unsigned int owner);
void btrfs_extent_io_tree_release(struct extent_io_tree *tree);
int btrfs_lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, u32 bits,
			   struct extent_state **cached);
bool btrfs_try_lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
				u32 bits, struct extent_state **cached);

static inline int btrfs_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
				    struct extent_state **cached)
{
	return btrfs_lock_extent_bits(tree, start, end, EXTENT_LOCKED, cached);
}

static inline bool btrfs_try_lock_extent(struct extent_io_tree *tree, u64 start,
					 u64 end, struct extent_state **cached)
{
	return btrfs_try_lock_extent_bits(tree, start, end, EXTENT_LOCKED, cached);
}

int __init btrfs_extent_state_init_cachep(void);
void __cold btrfs_extent_state_free_cachep(void);

u64 btrfs_count_range_bits(struct extent_io_tree *tree,
			   u64 *start, u64 search_end,
			   u64 max_bytes, u32 bits, bool contig,
			   struct extent_state **cached_state);

void btrfs_free_extent_state(struct extent_state *state);
bool btrfs_test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, u32 bit,
			  struct extent_state *cached_state);
bool btrfs_test_range_bit_exists(struct extent_io_tree *tree, u64 start, u64 end, u32 bit);
void btrfs_get_range_bits(struct extent_io_tree *tree, u64 start, u64 end, u32 *bits,
			  struct extent_state **cached_state);
int btrfs_clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
				   u32 bits, struct extent_changeset *changeset);
int btrfs_clear_extent_bit_changeset(struct extent_io_tree *tree, u64 start, u64 end,
				     u32 bits, struct extent_state **cached,
				     struct extent_changeset *changeset);

static inline int btrfs_clear_extent_bit(struct extent_io_tree *tree, u64 start,
					 u64 end, u32 bits,
					 struct extent_state **cached)
{
	return btrfs_clear_extent_bit_changeset(tree, start, end, bits, cached, NULL);
}

static inline int btrfs_unlock_extent(struct extent_io_tree *tree, u64 start, u64 end,
				      struct extent_state **cached)
{
	return btrfs_clear_extent_bit_changeset(tree, start, end, EXTENT_LOCKED,
						cached, NULL);

Annotation

Implementation Notes