&reserved_percent, NULL, NULL, &label, NULL, NULL, NULL, NULL, NULL, NULL);
argv += optind; // argv[0] -- device
// check the device is a block device
xmove_fd(xopen(argv[0], O_WRONLY), fd);
fstat(fd, &st);
&reserved_percent, NULL, NULL, &label, NULL, NULL, NULL, NULL, NULL, NULL);
argv += optind; // argv[0] -- device
// check the device is a block device
xmove_fd(xopen(argv[0], O_WRONLY), fd);
fstat(fd, &st);