diff options
Diffstat (limited to 'fs/btrfs/locking.h')
| -rw-r--r-- | fs/btrfs/locking.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/btrfs/locking.h b/fs/btrfs/locking.h index 21a285883e89..d715846c10b8 100644 --- a/fs/btrfs/locking.h +++ b/fs/btrfs/locking.h @@ -6,6 +6,9 @@ #ifndef BTRFS_LOCKING_H #define BTRFS_LOCKING_H +#include <linux/atomic.h> +#include <linux/wait.h> +#include <linux/percpu_counter.h> #include "extent_io.h" #define BTRFS_WRITE_LOCK 1 @@ -13,6 +16,8 @@ #define BTRFS_WRITE_LOCK_BLOCKING 3 #define BTRFS_READ_LOCK_BLOCKING 4 +struct btrfs_path; + void btrfs_tree_lock(struct extent_buffer *eb); void btrfs_tree_unlock(struct extent_buffer *eb); @@ -48,4 +53,19 @@ static inline void btrfs_tree_unlock_rw(struct extent_buffer *eb, int rw) BUG(); } +struct btrfs_drew_lock { + atomic_t readers; + struct percpu_counter writers; + wait_queue_head_t pending_writers; + wait_queue_head_t pending_readers; +}; + +int btrfs_drew_lock_init(struct btrfs_drew_lock *lock); +void btrfs_drew_lock_destroy(struct btrfs_drew_lock *lock); +void btrfs_drew_write_lock(struct btrfs_drew_lock *lock); +bool btrfs_drew_try_write_lock(struct btrfs_drew_lock *lock); +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); + #endif |