ACB_F_CAM_DEV_QFRZN
if((acb->acb_flags & ACB_F_CAM_DEV_QFRZN) == 0)
acb->acb_flags |= ACB_F_CAM_DEV_QFRZN;
if((acb->acb_flags & ACB_F_CAM_DEV_QFRZN) && (
acb->acb_flags &= ~ACB_F_CAM_DEV_QFRZN;