From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: linux-nfs-owner@vger.kernel.org Received: from fieldses.org ([174.143.236.118]:59597 "EHLO fieldses.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932724Ab1LFBKK (ORCPT ); Mon, 5 Dec 2011 20:10:10 -0500 Date: Mon, 5 Dec 2011 20:10:07 -0500 To: Steve Dickson Cc: Harald Dunkel , linux-nfs@vger.kernel.org Subject: Re: NFSv4 fsid=0 export still necessary? Message-ID: <20111206011007.GD3678@fieldses.org> References: <4EDA0650.9080702@afaics.de> <4EDA5387.5070103@RedHat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <4EDA5387.5070103@RedHat.com> From: "J. Bruce Fields" Sender: linux-nfs-owner@vger.kernel.org List-ID: On Sat, Dec 03, 2011 at 11:51:19AM -0500, Steve Dickson wrote: > No, the fsid=0 export option is no longer necessary to make v4 > exports compatible with v2/v3 exports. When the fsid option > is not set, the default root is define as "/" which allows > the v4 clients to mount the same exports as does the v2/v3 clients. > > Now if you do not what "/" as your default root, you can > set fsid to something like fsid=/export. This will > change to default root to the /export directory which > means your v4 clients will only be able to access exports > under the /export directory. I actually have some old patches that allow you to use an alternate root for all NFS versions; you'd do something like: /exports *(ro, root) /exports/foo *(rw) /exports/bar *(rw) and then a v2, v3, or v4 client would mount server:/foo or server:/bar. But that was just a fun project, it wasn't clear to me whether anyone wanted it particularly. Also, that didn't seem like a great user interface. I'd rather have something like rootpath=/exports foo *(rw) bar *(rw) Actually, as long as we were doing that I'd rather replace /etc/exports entirely; maybe do something like [nfsd] rootpath=/exports [export "foo"] clients=* options=rw [exports "bar"] clients=* options=rw And also use the same file for other nfsd parameters: [nfsd] versions=2,3,4,4.1 threads=8 rootpath=/exports [export "foo"] ... I don't know. --b.