Function draid_verify

freebsd/contrib/openzfs/tests/zfs-tests/cmd/draid/draid.c:926–1121

* Verify each map in the file by generating its in-memory permutation array * and comfirming its checksum is correct. */

 * and comfirming its checksum is correct.
 */
static int
draid_verify(int argc, char *argv[])
{
	char filename[MAXPATHLEN];
	int n = 0, c, error, verbose = 1;
	int check_ratios = 0;

	while ((c = getopt(argc, argv, ":rv")) != -1) {
		switch (c) {
		case 'r':
			check_ratios++;
			break;
		case 'v':
			verbose++;
			break;
		case ':':
			(void) fprintf(stderr,
			    "missing argument for '%c' option\n", optopt);
			draid_usage();
			break;
		case '?':
			(void) fprintf(stderr, "invalid option '%c'\n",
			    optopt);
			draid_usage();
			break;
		}
	}

	if (argc > optind) {
		char *abspath = malloc(MAXPATHLEN);
		if (abspath == NULL)
			return (ENOMEM);

		bzero(filename, MAXPATHLEN);
		if (realpath(argv[optind], abspath) != NULL)
			strncpy(filename, abspath, MAXPATHLEN - 1);
		else
			strncpy(filename, argv[optind], MAXPATHLEN - 1);

		free(abspath);
	} else {
		(void) fprintf(stderr, "A FILE must be specified.\n");
		return (1);
	}

	printf("Verifying permutation maps: '%s'\n", filename);

	/*
	 * Lookup hardcoded permutation map for each valid number of children
	 * and verify a generated map has the correct checksum.  Then compare
	 * the generated map values with the nvlist map values read from the
	 * reference file to cross-check the permutation.
	 */
	for (uint64_t children = VDEV_DRAID_MIN_CHILDREN;
	    children <= VDEV_DRAID_MAX_CHILDREN;
	    children++) {
		draid_map_t *map;
		char key[8];