Function sglist_append

freebsd/kern/subr_sglist.c:315–328

* Append the segments to describe a single kernel virtual address * range to a scatter/gather list. If there are insufficient * segments, then this fails with EFBIG. */

 * segments, then this fails with EFBIG.
 */
int
sglist_append(struct sglist *sg, void *buf, size_t len)
{
	struct sgsave save;
	int error;

	if (sg->sg_maxseg == 0)
		return (EINVAL);
	SGLIST_SAVE(sg, save);
	error = _sglist_append_buf(sg, buf, len, NULL, NULL);
	if (error)
		SGLIST_RESTORE(sg, save);
	return (error);
}

/*
 * Append the segments to describe a bio's data to a scatter/gather list.