Commit 39f9d028 authored by Liu Bo's avatar Liu Bo Committed by Josef Bacik
Browse files

Btrfs: save us a read_lock 



This does not change the logic of code, but can save us a read_lock.

Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
Signed-off-by: default avatarJosef Bacik <jbacik@fusionio.com>
parent 51fab693

fs/btrfs/locking.c

+2 −3
Original line number Diff line number Diff line
@@ -113,11 +113,10 @@ void btrfs_tree_read_lock(struct extent_buffer *eb) 
		read_unlock(&eb->lock);

		return;

	}

	read_unlock(&eb->lock);

	wait_event(eb->write_lock_wq, atomic_read(&eb->blocking_writers) == 0);

	read_lock(&eb->lock);

	if (atomic_read(&eb->blocking_writers)) {

		read_unlock(&eb->lock);

		wait_event(eb->write_lock_wq,

			   atomic_read(&eb->blocking_writers) == 0);

		goto again;

	}

	atomic_inc(&eb->read_locks);