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Btrfs: only unlock and relock if we have to 

I noticed while doing fsync tests that we were always dropping the path and
re-searching when we first cow the log root even though we've already gotten
the write lock on the root.  That's because we don't take into account that
there might not be a parent node, so fix the check to make sure there is
actually a parent node before we undo all of this work for nothing.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Josef Bacik 2012-11-07 13:44:13 -05:00 committed by Chris Mason
parent 0b1c6ccade
commit 5124e00ec5
1 changed files with 4 additions and 1 deletions
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5
fs/btrfs/ctree.c
View File

@ -2564,7 +2564,10 @@ again:
* must have write locks on this node and the
* parent
*/
if (level + 1 > write_lock_level) {
if (level > write_lock_level ||
(level + 1 > write_lock_level &&
level + 1 < BTRFS_MAX_LEVEL &&
p->nodes[level + 1])) {
write_lock_level = level + 1;
btrfs_release_path(p);
goto again;