VOP_WHITEOUT
error = VOP_WHITEOUT(dvp, &cn, CREATE);
error = VOP_WHITEOUT(um->um_uppervp, &nullcn, LOOKUP);
return (VOP_WHITEOUT(un->un_uppervp, cnp, ap->a_flags));
error = VOP_WHITEOUT(ump->um_uppervp, &fakecn, LOOKUP);
error = VOP_WHITEOUT(udvp, cnp, ap->a_flags);
error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0)
error = VOP_WHITEOUT(dvp, cnp, flags);
int VOP_WHITEOUT(struct vnode *, struct componentname *, int);