vn_in_dnlc
ASSERT(!vn_in_dnlc(ZTOV(rootzp))); /* not valid to move */
if (vp->v_count != 1 || !vn_in_dnlc(vp)) {
ASSERT(!vn_in_dnlc(ZTOV(sharezp))); /* not valid to move */
int vn_in_dnlc(vnode_t *);