autofs_node_vn
int autofs_node_vn(struct autofs_node *anp, struct mount *mp,
error = autofs_node_vn(amp->am_root, mp, LK_EXCLUSIVE, vpp);
error = autofs_node_vn(child, dvp->v_mount, LK_EXCLUSIVE, &vp);
error = autofs_node_vn(child, dvp->v_mount, LK_EXCLUSIVE, &vp);