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=-5.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 73089C4363C for ; Wed, 7 Oct 2020 18:05:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DB5082168B for ; Wed, 7 Oct 2020 18:05:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fieldses.org header.i=@fieldses.org header.b="RHk56nVC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727816AbgJGSFS (ORCPT ); Wed, 7 Oct 2020 14:05:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37168 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728305AbgJGSFP (ORCPT ); Wed, 7 Oct 2020 14:05:15 -0400 Received: from fieldses.org (fieldses.org [IPv6:2600:3c00:e000:2f7::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5A042C061755 for ; Wed, 7 Oct 2020 11:05:15 -0700 (PDT) Received: by fieldses.org (Postfix, from userid 2815) id A270D4F3B; Wed, 7 Oct 2020 14:05:14 -0400 (EDT) DKIM-Filter: OpenDKIM Filter v2.11.0 fieldses.org A270D4F3B DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fieldses.org; s=default; t=1602093914; bh=C20DbcdT9TPGzHPEZ8cIUOzZlHQG3fYNLlI/h+IjGDY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=RHk56nVCDoB6f18ULDs5BoQ90f1/9rU4aac+Wc7X5a3lfWYoqog29jcFVvodJybuk KP9GoZ5PKVlpL14wQAzYTgeYfe6xJqwpDqDk6ZO88QBLPj17q9q9VkEL4ILYUl8n+O 39e8PBVWsNKlzSRENTKe1zSs9Jj6m9SNxDFpVbfM= Date: Wed, 7 Oct 2020 14:05:14 -0400 From: "bfields@fieldses.org" To: Trond Myklebust Cc: "linux-nfs@vger.kernel.org" , "aglo@umich.edu" , "bcodding@redhat.com" , "chuck.lever@oracle.com" Subject: Re: unsharing tcp connections from different NFS mounts Message-ID: <20201007180514.GG23452@fieldses.org> References: <20201007001814.GA5138@fieldses.org> <57E3293C-5C49-4A80-957B-E490E6A9B32E@redhat.com> <5B5CF80C-494A-42D3-8D3F-51C0277D9E1B@redhat.com> <8ED5511E-25DE-4C06-9E26-A1947383C86A@oracle.com> <20201007140502.GC23452@fieldses.org> <85F496CD-9AAC-451C-A224-FCD138BDC591@oracle.com> <20201007160556.GE23452@fieldses.org> <6d9aee613e9fb25509c9317910189ee37a2e4b43.camel@hammerspace.com> <20201007171559.GF23452@fieldses.org> <5998d49f790736aa49e7a2ac89b555bc99f3b543.camel@hammerspace.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5998d49f790736aa49e7a2ac89b555bc99f3b543.camel@hammerspace.com> User-Agent: Mutt/1.5.21 (2010-09-15) Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org On Wed, Oct 07, 2020 at 05:29:26PM +0000, Trond Myklebust wrote: > On Wed, 2020-10-07 at 13:15 -0400, Bruce Fields wrote: > > Yeah, honestly I don't understand the details of that case either. > > > > (There is one related thing I'm curious about, which is how close we > > are > > to keeping clients in different containers completely separate (which > > we'd need, for example, if we were to ever permit unprivileged nfs > > mounts). It looks to me like as long as two network namespaces use > > different client identifiers, the client should keep different state > > for > > them already? Or is there more to do there?) > > The containerised use case should already work. The containers have > their own private uniquifiers, which can be changed > via /sys/fs/nfs/net/nfs_client/identifier. I was just looking at that commit (bf11fbd20b3 "NFS: Add sysfs support for per-container identifier"), and I'm confused by it: it adds code to nfs/sysfs to get and set "identifier", but nothing anywhere that actually uses the value. I can't figure out what I'm missing. --b. > In fact, there is also a udev trigger for that pseudofile, so my plan > is (in my copious spare time) to write a /usr/lib/udev/nfs-set- > identifier helper in order to manage the container uniquifier, to allow > generation on the fly and persistence. > > -- > Trond Myklebust > Linux NFS client maintainer, Hammerspace > trond.myklebust@hammerspace.com > >