Function dump_label

freebsd/contrib/openzfs/cmd/zdb/zdb.c:4587–4769

}

static int
dump_label(const char *dev)
{
	char path[MAXPATHLEN];
	zdb_label_t labels[VDEV_LABELS];
	uint64_t psize, ashift, l2cache;
	struct stat64 statbuf;
	boolean_t config_found = B_FALSE;
	boolean_t error = B_FALSE;
	boolean_t read_l2arc_header = B_FALSE;
	avl_tree_t config_tree;
	avl_tree_t uberblock_tree;
	void *node, *cookie;
	int fd;

	bzero(labels, sizeof (labels));

	/*
	 * Check if we were given absolute path and use it as is.
	 * Otherwise if the provided vdev name doesn't point to a file,
	 * try prepending expected disk paths and partition numbers.
	 */
	(void) strlcpy(path, dev, sizeof (path));
	if (dev[0] != '/' && stat64(path, &statbuf) != 0) {
		int error;

		error = zfs_resolve_shortname(dev, path, MAXPATHLEN);
		if (error == 0 && zfs_dev_is_whole_disk(path)) {
			if (zfs_append_partition(path, MAXPATHLEN) == -1)
				error = ENOENT;
		}

		if (error || (stat64(path, &statbuf) != 0)) {
			(void) printf("failed to find device %s, try "
			    "specifying absolute path instead\n", dev);
			return (1);
		}
	}

	if ((fd = open64(path, O_RDONLY)) < 0) {
		(void) printf("cannot open '%s': %s\n", path, strerror(errno));
		exit(1);
	}

	if (fstat64_blk(fd, &statbuf) != 0) {
		(void) printf("failed to stat '%s': %s\n", path,
		    strerror(errno));
		(void) close(fd);
		exit(1);
	}

	if (S_ISBLK(statbuf.st_mode) && zfs_dev_flush(fd) != 0)
		(void) printf("failed to invalidate cache '%s' : %s\n", path,
		    strerror(errno));

	avl_create(&config_tree, cksum_record_compare,
	    sizeof (cksum_record_t), offsetof(cksum_record_t, link));
	avl_create(&uberblock_tree, cksum_record_compare,