btrfs: qgroup: clear STATUS_FLAG_ON in disabling quota.

we forgot to clear STATUS_FLAG_ON in quota_disable(), it
will cause a problem shown as below:

	# mount /dev/sdc /mnt
	# btrfs quota enable /mnt
	# btrfs quota disable /mnt
	# btrfs quota rescan /mnt
	quota rescan started <--- expecting it fail here.
	# echo $?
	0

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
(cherry picked from commit 8ea0ec9e011eb542a3e7b1171776aa4877cf8a90)

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index a1954a92de862a4ca8f4e4c87528d241d6cc8e26..c75bdbf0ab5d47000b3a5606a16f1ab86e4830aa 100644 (file)
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -966,6 +966,7 @@ int btrfs_quota_disable(struct btrfs_trans_handle *trans,
        fs_info->pending_quota_state = 0;
        quota_root = fs_info->quota_root;
        fs_info->quota_root = NULL;
+       fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON;
        spin_unlock(&fs_info->qgroup_lock);
 
        btrfs_free_qgroup_config(fs_info);