diff options
Diffstat (limited to 'fs/btrfs/locking.c')
| -rw-r--r-- | fs/btrfs/locking.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c index d43e14c7471a..0cc314c10d66 100644 --- a/fs/btrfs/locking.c +++ b/fs/btrfs/locking.c @@ -56,3 +56,19 @@ int btrfs_tree_locked(struct extent_buffer *eb) { return mutex_is_locked(&eb->mutex); } + +int btrfs_path_lock_waiting(struct btrfs_path *path, int level) +{ + int i; + struct extent_buffer *eb; + for (i = level; i <= level + 1 && i < BTRFS_MAX_LEVEL; i++) { + eb = path->nodes[i]; + if (!eb) + break; + smp_mb(); + if (!list_empty(&eb->mutex.wait_list)) + return 1; + } + return 0; +} + |