specinfo
struct specinfo specinfo;
if (KREAD(kd, (u_long)vp->v_specinfo, &specinfo)) {
vp->v_specinfo = &specinfo;
free(vp->v_specinfo, M_VNODE, sizeof(struct specinfo));
nvp->v_specinfo = malloc(sizeof(struct specinfo), M_VNODE,
struct specinfo *vu_specinfo; /* device (VCHR, VBLK) */