btrfs: fix race between quota disable and quota assign ioctls

[platform/kernel/linux-rpi.git] / fs / btrfs / ioctl.c

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index ed9c715..f417329 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -4267,7 +4267,9 @@ static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
        }
 
        /* update qgroup status and info */
+       mutex_lock(&fs_info->qgroup_ioctl_lock);
        err = btrfs_run_qgroups(trans);
+       mutex_unlock(&fs_info->qgroup_ioctl_lock);
        if (err < 0)
                btrfs_handle_fs_error(fs_info, err,
                                      "failed to update qgroup status and info");