vr_start
req->vr_start = ddi_get_lbolt();
req->vr_start = ddi_get_lbolt();
req->vr_expire = req->vr_start + req->vr_time * vioscsi_hz;
clock_t vr_start; /* ticks */
(void) vr_start(vrp);
rc = vr_start(vrp);
static int vr_start(vr_t *vrp);
(void) vr_start(vrp);