[PATCH 1/3] btrfs: qgroup: return EINVAL if level of parent is not higher than child's.

[Dongsheng Yang]

When we create a subvol inheriting a qgroup, we need to check the level
of them. Otherwise, there is a chance a qgroup can inherit another qgroup
at the same level.

Signed-off-by: Dongsheng Yang <yangds.f...@cn.fujitsu.com>
---
 fs/btrfs/qgroup.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 5a1463d..d519055 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -2244,6 +2244,11 @@ int btrfs_qgroup_inherit(struct btrfs_trans_handle 
*trans,
                                ret = -EINVAL;
                                goto out;
                        }
+
+                       if ((srcgroup->qgroupid >> 48) <= (objectid >> 48)) {
+                               ret = -EINVAL;
+                               goto out;
+                       }
                        ++i_qgroups;
                }
        }
-- 
1.8.4.2

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