318 	if (un->un_pvp != NULLVP)  in union_rele()
320 	if (un->un_uppervp != NULLVP)  in union_rele()
322 	if (un->un_lowervp != NULLVP)  in union_rele()
324 	if (un->un_dirvp != NULLVP)  in union_rele()
367 	struct vnode *vp, *xlowervp = NULLVP;  in union_allocvp()
374 	if (uppervp == NULLVP && lowervp == NULLVP)  in union_allocvp()
379 		lowervp = NULLVP;  in union_allocvp()
390 		hash[1] = UNION_HASH(uppervp, NULLVP);  in union_allocvp()
391 		hash[2] = UNION_HASH(NULLVP, lowervp);  in union_allocvp()
452 			if (cnp && (lowervp != NULLVP)) {  in union_allocvp()
479 	if (undvp != NULLVP)  in union_allocvp()
489 	if (dvp && cnp && (lowervp != NULLVP)) {  in union_allocvp()
567 	svp = (un->un_uppervp != NULLVP) ? un->un_uppervp : un->un_lowervp;  in union_loadvnode()
585 	    ((un->un_lowervp == NULLVP) || un->un_lowervp == um->um_lowervp)) {  in union_loadvnode()
586 		if (un->un_lowervp == NULLVP) {  in union_loadvnode()
588 			if (un->un_lowervp != NULLVP)   in union_loadvnode()
595 	if (un->un_uppervp != NULLVP) {  in union_loadvnode()
602 	if (un->un_lowervp != NULLVP) {  in union_loadvnode()
899 	*vpp = NULLVP;  in union_vn_create()
971 	union_newupper(un, NULLVP);  in union_removed_upper()
990 	if ((un->un_lowervp != NULLVP) &&
996 	return (NULLVP);
1009 	if (un->un_lowervp != NULLVP)  in union_dowhiteout()
1038 	if (un->un_uppervp != NULLVP)  in union_dircache_r()
1040 	if (un->un_lowervp != NULLVP)  in union_dircache_r()
1048 	struct vnode *nvp = NULLVP;  in union_dircache()
1056 	nvp = NULLVP;  in union_dircache()
1068 		*vpp = NULLVP;  in union_dircache()
1075 		} while (*vpp != NULLVP);  in union_dircache()
1078 	if (*vpp == NULLVP)  in union_dircache()
1082 	error = union_allocvp(&nvp, vp->v_mount, NULLVP, NULLVP, 0,  in union_dircache()
1083 	    NULLVP, *vpp, 0);  in union_dircache()
1103 		for (vpp = un->un_dircache; *vpp != NULLVP; vpp++)  in union_diruncache()
1218 	if ((lvp = union_dircache(vp, l)) == NULLVP)  in union_readdirhook()