rootfs_fs_type   3722 fs/namespace.c 	mnt = vfs_kern_mount(&rootfs_fs_type, 0, "rootfs", NULL);
rootfs_fs_type    152 include/linux/init.h extern struct file_system_type rootfs_fs_type;
rootfs_fs_type    638 init/do_mounts.c struct file_system_type rootfs_fs_type = {