btrfs: qgroup: Fix a regression in qgroup reserved space.

During the change to new btrfs extent-oriented qgroup implement, due to
it doesn't use the old __qgroup_excl_accounting() for exclusive extent,
it didn't free the reserved bytes.

The bug will cause limit function go crazy as the reserved space is
never freed, increasing limit will have no effect and still cause
EQOUT.

The fix is easy, just free reserved bytes for newly created exclusive
extent as what it does before.

Reported-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Yang Dongsheng <yangds.fnst@cn.fujitsu.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index e9ace099162ce14d73d04523962465ee163b30c7..8a820295657686d634e3a5ded2ee21b5dcefc026 100644 (file)
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -1651,6 +1651,11 @@ static int qgroup_update_counters(struct btrfs_fs_info *fs_info,
                                /* Exclusive -> exclusive, nothing changed */
                        }
                }
+
+               /* 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);
        }