PUD_REQ_BDEV
if (pdr->pdr_reqclass == PUD_REQ_BDEV) {
case PUD_REQ_BDEV:
return doopenclose(dev, flags, fmt, PUD_REQ_BDEV, PUD_BDEV_OPEN);
return doopenclose(dev, flags, fmt, PUD_REQ_BDEV, PUD_BDEV_CLOSE);
error = pud_request(bp->b_dev, pc_rw, allocsize, PUD_REQ_BDEV,
return doioctl(dev, cmd, data, flag, PUD_REQ_BDEV, PUD_BDEV_IOCTL);