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Btrfs: check for an extent_op on the locked ref

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We could have possibly added an extent_op to the locked_ref while we dropped
locked_ref->lock, so check for this case as well and loop around.  Otherwise we
could lose flag updates which would lead to extent tree corruption.  Thanks,

cc: stable@vger.kernel.org
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Josef Bacik 2014-03-27 19:41:34 -04:00 committed by Chris Mason
parent ba8b028933
commit 573a075567
1 changed files with 2 additions and 1 deletions
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3
fs/btrfs/extent-tree.c
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@ -2444,7 +2444,8 @@ static noinline int __btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
spin_unlock(&locked_ref->lock);
spin_lock(&delayed_refs->lock);
spin_lock(&locked_ref->lock);
if (rb_first(&locked_ref->ref_root)) {
if (rb_first(&locked_ref->ref_root) ||
locked_ref->extent_op) {
spin_unlock(&locked_ref->lock);
spin_unlock(&delayed_refs->lock);
continue;