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>

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 7624212ae92600fbebc72bb58ba79b4af9a99309..dd8e3448fe8fafaebc315df5032d897be975c3fb 100644 (file)
--- 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);