blkif_vdev_t
blkif_vdev_t handle; /* only for read/write requests */
blkif_vdev_t handle; /* only for read/write requests */
blkif_vdev_t vdev = xvdi_get_vdevnum(dip);
blkif_vdev_t handle; /* only for read/write requests */
#ifndef blkif_vdev_t