VOP_MKNOD
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd,
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &va);
int VOP_MKNOD(struct vnode *, struct vnode **, struct componentname *,