SG_DXFER_TO_DEV
case SG_DXFER_TO_DEV:
hdr.dxfer_direction = SG_DXFER_TO_DEV;
int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? ITER_SOURCE : ITER_DEST;
rq = scsi_alloc_request(q, hp->dxfer_direction == SG_DXFER_TO_DEV ?
SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
if ((hp->dxfer_direction == SG_DXFER_TO_DEV) ||