VOP_READ
error = VOP_READ(vn->sc_vp, &auio, IO_RECURSE,
error = VOP_READ(vn->sc_vp, &auio, 0, vn->sc_cred);
error = VOP_READ(ttyvp, ap->a_uio, ap->a_ioflag, NOCRED);
error = VOP_READ(vp, &auio, 0, td->td_ucred);
error = VOP_READ(vp, &auio, ioflg, cred);
return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
error = VOP_READ(vp, uiop, IO_NODELOCKED | ioflag, cred);
error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]);
return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
error = VOP_READ(vp, &auio, ioflags, proc0.p_ucred);