zil_vdev_node_t
zil_vdev_node_t *zv, zvsearch;
zil_vdev_node_t *zv;
zil_vdev_node_t *zv;
sizeof (zil_vdev_node_t), offsetof(zil_vdev_node_t, zv_node));
const uint64_t v1 = ((zil_vdev_node_t *)x1)->zv_vdev;
const uint64_t v2 = ((zil_vdev_node_t *)x2)->zv_vdev;