From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 71387C04AB5 for ; Mon, 3 Jun 2019 14:27:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4F95227858 for ; Mon, 3 Jun 2019 14:27:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728731AbfFCO1U (ORCPT ); Mon, 3 Jun 2019 10:27:20 -0400 Received: from mx1.redhat.com ([209.132.183.28]:36214 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727650AbfFCO1U (ORCPT ); Mon, 3 Jun 2019 10:27:20 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 62474C1EB1F2; Mon, 3 Jun 2019 14:27:20 +0000 (UTC) Received: from madhat.boston.devel.redhat.com (ovpn-116-46.phx2.redhat.com [10.3.116.46]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0041E601B6; Mon, 3 Jun 2019 14:27:19 +0000 (UTC) Subject: Re: [PATCH] manpage: explain why showmount doesn't really work against a v4-only server To: Jeff Layton Cc: linux-nfs@vger.kernel.org, jfajerski@suse.com References: <20190510215445.1823-1-jlayton@kernel.org> From: Steve Dickson Message-ID: Date: Mon, 3 Jun 2019 10:27:19 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190510215445.1823-1-jlayton@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Mon, 03 Jun 2019 14:27:20 +0000 (UTC) Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org On 5/10/19 5:54 PM, Jeff Layton wrote: > From: Jeff Layton > > I occasionally see people that expect valid info when running showmount > against a server that may export some or all filesystems via NFSv4. > Let's make it clear that it only works by talking to the remote MNT > service, and that that may not be available from a v4-only server. > > Cc: Jan Fajerski > Signed-off-by: Jeff Layton Committed... steved. > --- > utils/showmount/showmount.man | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/utils/showmount/showmount.man b/utils/showmount/showmount.man > index a2f510fb5617..35818e1b61c5 100644 > --- a/utils/showmount/showmount.man > +++ b/utils/showmount/showmount.man > @@ -56,5 +56,10 @@ Because > .B showmount > sorts and uniqs the output, it is impossible to determine from > the output whether a client is mounting the same directory more than once. > +.P > +.B showmount > +works by contacting the server's MNT service directly. NFSv4-only servers have > +no need to advertise their exported root filehandles via this method, and may > +not expose their MNT service to clients. > .SH AUTHOR > Rick Sladkey > -- 2.21.0 >