VOP_LOOKUP
error = VOP_LOOKUP(dvp, ap->a_vpp, cnp);
error = VOP_LOOKUP(newvp, vpp, cnp);
r = VOP_LOOKUP(vp, &nvp,
error = VOP_LOOKUP(un->un_uppervp, &tvp, &cn);
error = VOP_LOOKUP(dvp, &vp, cnp);
error = VOP_LOOKUP(dvp, &tdvp, cnp);
lookuperr = VOP_LOOKUP(lvp, &tvp, &cn);
lookuperr = VOP_LOOKUP(uvp, &tvp, &cn);
error = VOP_LOOKUP(dtmpvp, &vp, cnp);
uerror = VOP_LOOKUP(udvp, &uvp, cnp);
lerror = VOP_LOOKUP(ldvp, &lvp, cnp);
error = VOP_LOOKUP(lvp, uvpp, &cn);
error = VOP_LOOKUP(searchdir, &foundobj, cnp);
error = VOP_LOOKUP(dvp, vpp, cnp);
error = VOP_LOOKUP(dvp, vpp, cnp);
int VOP_LOOKUP(struct vnode *, struct vnode **, struct componentname *);