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[6/8] Btrfs: save us a read_lock

Message ID 1356598884-22952-6-git-send-email-bo.li.liu@oracle.com (mailing list archive)
State New, archived
Headers show

Commit Message

Liu Bo Dec. 27, 2012, 9:01 a.m. UTC 
This does not change the logic of code, but can save us a read_lock.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
---
 fs/btrfs/locking.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)
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Patch

diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c
index 2a1762c..e95df43 100644
--- a/fs/btrfs/locking.c
+++ b/fs/btrfs/locking.c
@@ -113,11 +113,10 @@  again:
 		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);