fs/btrfs/delayed-inode.h

Source file repositories/reference/linux-study-clean/fs/btrfs/delayed-inode.h

File Facts

System
Linux kernel
Corpus path
fs/btrfs/delayed-inode.h
Extension
.h
Size
7802 bytes
Lines
258
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 btrfs_ref_tracker_dir {
#ifdef CONFIG_BTRFS_DEBUG
	struct ref_tracker_dir dir;
#else
	struct {} tracker;
#endif
};

struct btrfs_ref_tracker {
#ifdef CONFIG_BTRFS_DEBUG
	struct ref_tracker *tracker;
#else
	struct {} tracker;
#endif
};

#define BTRFS_DELAYED_NODE_IN_LIST	0
#define BTRFS_DELAYED_NODE_INODE_DIRTY	1
#define BTRFS_DELAYED_NODE_DEL_IREF	2

struct btrfs_delayed_node {
	u64 inode_id;
	u64 bytes_reserved;
	struct btrfs_root *root;
	/* Used to add the node into the delayed root's node list. */
	struct list_head n_list;
	/*
	 * Used to add the node into the prepare list, the nodes in this list
	 * is waiting to be dealt with by the async worker.
	 */
	struct list_head p_list;
	struct rb_root_cached ins_root;
	struct rb_root_cached del_root;
	struct mutex mutex;
	struct btrfs_inode_item inode_item;
	refcount_t refs;
	int count;
	u64 index_cnt;
	unsigned long flags;
	/*
	 * The size of the next batch of dir index items to insert (if this
	 * node is from a directory inode). Protected by @mutex.
	 */
	u32 curr_index_batch_size;
	/*
	 * Number of leaves reserved for inserting dir index items (if this
	 * node belongs to a directory inode). This may be larger then the
	 * actual number of leaves we end up using. Protected by @mutex.
	 */
	u32 index_item_leaves;
	/* Track all references to this delayed node. */
	struct btrfs_ref_tracker_dir ref_dir;
	/* Track delayed node reference stored in node list. */
	struct btrfs_ref_tracker node_list_tracker;
	/* Track delayed node reference stored in inode cache. */
	struct btrfs_ref_tracker inode_cache_tracker;
};

struct btrfs_delayed_item {
	struct rb_node rb_node;
	/* Offset value of the corresponding dir index key. */
	u64 index;
	struct list_head tree_list;	/* used for batch insert/delete items */
	struct list_head readdir_list;	/* used for readdir items */
	/*
	 * Used when logging a directory.
	 * Insertions and deletions to this list are protected by the parent
	 * delayed node's mutex.
	 */
	struct list_head log_list;
	u64 bytes_reserved;
	struct btrfs_delayed_node *delayed_node;
	refcount_t refs;
	enum btrfs_delayed_item_type type:8;
	/*
	 * Track if this delayed item was already logged.
	 * Protected by the mutex of the parent delayed inode.
	 */
	bool logged;
	/* The maximum leaf size is 64K, so u16 is more than enough. */
	u16 data_len;
	char data[] __counted_by(data_len);
};

void btrfs_init_delayed_root(struct btrfs_delayed_root *delayed_root);
int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
				   const char *name, int name_len,
				   struct btrfs_inode *dir,
				   const struct btrfs_disk_key *disk_key, u8 flags,
				   u64 index);

Annotation

Implementation Notes