taglinefilesource code
old_root_dev933fs/super.ckdev_t old_root_dev;
old_root_dev941fs/super.cold_root_dev = ROOT_DEV;
old_root_dev960fs/super.cumount_error = do_umount(old_root_dev,1);
old_root_dev964fs/super.cinvalidate_buffers(old_root_dev);
old_root_dev969fs/super.cremove_vfsmnt(old_root_dev);
old_root_dev970fs/super.cvfsmnt = add_vfsmnt(old_root_dev,"old_rootfs",put_old);