vfs_rootmountalloc
if ((error = vfs_rootmountalloc("cd9660", "root_device", &mp)) != 0)
if (vfs_rootmountalloc("nfs", mntname, &mp))
int vfs_rootmountalloc(char *, char *, struct mount **);
if ((error = vfs_rootmountalloc("ext2fs", "root_device", &mp)) != 0) {
if ((error = vfs_rootmountalloc("ffs", "root_device", &mp)) != 0) {