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Btrfs: save us a read_lock

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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>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Liu Bo 2012-12-27 09:01:22 +00:00 committed by Josef Bacik
parent 51fab69347
commit 39f9d028c9
1 changed files with 2 additions and 3 deletions
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5
fs/btrfs/locking.c
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@ -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);