btrfs: qgroup: Fix a rebase bug which will cause qgroup double free

When rebasing my patchset, I forgot to pick up a cleanup patch to remove
old hotfix in 4.2 release.

Witouth the cleanup, it will screw up new qgroup reserve framework and
always cause minus reserved number.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 0 insertions, 4 deletions

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 31d19344427a..46476c226395 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -1652,10 +1652,6 @@ static int qgroup_update_counters(struct btrfs_fs_info *fs_info,
                         }
                 }
 
-                /* For exclusive extent, free its reserved bytes too */
-                if (nr_old_roots == 0 && nr_new_roots == 1 &&
-                    cur_new_count == nr_new_roots)
-                        qg->reserved -= num_bytes;
                 if (dirty)
                         qgroup_dirty(fs_info, qg);
         }