[PATCH 5.4 09/86] btrfs: dont clear ret in btrfs_start_dirty_block_groups

[Greg Kroah-Hartman]

From: Josef Bacik <jo...@toxicpanda.com>

commit 34d1eb0e599875064955a74712f08ff14c8e3d5f upstream.

If we fail to update a block group item in the loop we'll break, however
we'll do btrfs_run_delayed_refs and lose our error value in ret, and
thus not clean up properly.  Fix this by only running the delayed refs
if there was no failure.

CC: sta...@vger.kernel.org # 4.4+
Reviewed-by: Qu Wenruo <w...@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumsh...@wdc.com>
Signed-off-by: Josef Bacik <jo...@toxicpanda.com>
Reviewed-by: David Sterba <dste...@suse.com>
Signed-off-by: David Sterba <dste...@suse.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/btrfs/block-group.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/btrfs/block-group.c
+++ b/fs/btrfs/block-group.c
@@ -2497,7 +2497,8 @@ again:
         * Go through delayed refs for all the stuff we've just kicked off
         * and then loop back (just once)
         */
-       ret = btrfs_run_delayed_refs(trans, 0);
+       if (!ret)
+               ret = btrfs_run_delayed_refs(trans, 0);
        if (!ret && loops == 0) {
                loops++;
                spin_lock(&cur_trans->dirty_bgs_lock);