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	null_open(struct vop_open_args *ap)			null_open(struct vop_open_args *ap)
	{			{
	int retval;			int retval;
	struct vnode vp, ldvp;			struct vnode vp, ldvp;

	vp = ap->a_vp;			vp = ap->a_vp;
	ldvp = NULLVPTOLOWERVP(vp);			ldvp = NULLVPTOLOWERVP(vp);
	retval = null_bypass(&ap->a_gen);			retval = null_bypass(&ap->a_gen);
	if (retval == 0)			if (retval == 0) {
	vp->v_object = ldvp->v_object;			vp->v_object = ldvp->v_object;
				if ((ldvp->v_irflag & VIRF_PGREAD) != 0) {
				MPASS(vp->v_object != NULL);
				if ((vp->v_irflag & VIRF_PGREAD) == 0) {
				VI_LOCK(vp);
				vp->v_irflag \|= VIRF_PGREAD;
				VI_UNLOCK(vp);
				}
				}
				}
	return (retval);			return (retval);
	}			}

	/*			/*
	* Setattr call. Disallow write attempts if the layer is mounted read-only.			* Setattr call. Disallow write attempts if the layer is mounted read-only.
	*/			*/
	static int			static int
	null_setattr(struct vop_setattr_args *ap)			null_setattr(struct vop_setattr_args *ap)
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