fw_xfer_alloc_buf
rb->xfer = fw_xfer_alloc_buf(M_FWXFER, 0, /* XXX */
xfer = fw_xfer_alloc_buf(M_FWXFER, 8, 4);
xfer = fw_xfer_alloc_buf(type, slen, rlen);
struct fw_xfer *fw_xfer_alloc_buf (struct malloc_type *, int, int);
if ((xfer = fw_xfer_alloc_buf(M_FWXFER, uio->uio_resid,
xfer = fw_xfer_alloc_buf(M_FWXFER, pay_len, PAGE_SIZE/*XXX*/);
xfer = fw_xfer_alloc_buf(M_SBP, 8, 0);