buf_to_iov
ssize_t buf_to_iov(const void *, size_t, const struct iovec *, size_t);
len = buf_to_iov(priv->bdp_bbuf, priv->bdp_bbuflen,
ret = buf_to_iov(priv->bbuf, priv->bbuflen,
iolen += buf_to_iov(cmd_wr, VTSCSI_OUT_HEADER_LEN(q->vsq_sc),
buf_to_iov((uint8_t *)buf, bufsize, iov, n);
(void) buf_to_iov(ext_data, nxferred,