DIOCGSTRIPEOFFSET
if (g_ioctl_arg(fd, DIOCGSTRIPEOFFSET, &stripeoffset) == -1)
error = csw->d_ioctl(dev, DIOCGSTRIPEOFFSET, (caddr_t)&po,
case DIOCGSTRIPEOFFSET:
ioctl(fd, DIOCGSTRIPEOFFSET, &psectoff);
error = ioctl(fd, DIOCGSTRIPEOFFSET, &stripeoffset);