Btrfs: disable qgroup id 0

Qgroup id 0 is a special number, we should set the id of a qgroup to 0.
Fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 7624212ae926..dd8e3448fe8f 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3698,6 +3698,11 @@ static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
                 goto drop_write;
         }
 
+        if (!sa->qgroupid) {
+                ret = -EINVAL;
+                goto out;
+        }
+
         trans = btrfs_join_transaction(root);
         if (IS_ERR(trans)) {
                 ret = PTR_ERR(trans);