From mboxrd@z Thu Jan 1 00:00:00 1970 From: "J. Bruce Fields" Subject: Re: [pnfs] [PATCH v2 06/47] nfsd41: Add Kconfig symbols for NFSv4.1 Date: Thu, 2 Apr 2009 13:58:06 -0400 Message-ID: <20090402175806.GB5560@fieldses.org> References: <49D4C19F.7090608@panasas.com> <1238681800.6191.5.camel@heimdal.trondhjem.org> <20090402142256.GF24124@fieldses.org> <1238682355.6191.6.camel@heimdal.trondhjem.org> <20090402143141.GG24124@fieldses.org> <49D4E915.40705@panasas.com> <20090402165427.GA32533@fieldses.org> <49D4F9BE.3010102@panasas.com> <49D4FB68.20502@panasas.com> <20090402175517.GA5560@fieldses.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-nfs@vger.kernel.org, pnfs@linux-nfs.org, Trond Myklebust , Steve Dickson To: Benny Halevy Return-path: Received: from mail.fieldses.org ([141.211.133.115]:59200 "EHLO pickle.fieldses.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756265AbZDBR6H (ORCPT ); Thu, 2 Apr 2009 13:58:07 -0400 In-Reply-To: <20090402175517.GA5560@fieldses.org> Sender: linux-nfs-owner@vger.kernel.org List-ID: On Thu, Apr 02, 2009 at 01:55:17PM -0400, bfields wrote: > On Thu, Apr 02, 2009 at 08:52:40PM +0300, Benny Halevy wrote: > > On Apr. 02, 2009, 20:45 +0300, Benny Halevy wrote: > > > On Apr. 02, 2009, 19:54 +0300, "J. Bruce Fields" wrote: > > >> On Thu, Apr 02, 2009 at 07:34:29PM +0300, Benny Halevy wrote: > > >>> On Apr. 02, 2009, 17:31 +0300, "J. Bruce Fields" wrote: > > >>>> On Thu, Apr 02, 2009 at 10:25:55AM -0400, Trond Myklebust wrote: > > >>>>> On Thu, 2009-04-02 at 10:22 -0400, J. Bruce Fields wrote: > > >>>>>> On Thu, Apr 02, 2009 at 10:16:40AM -0400, Trond Myklebust wrote: > > >>>>>>> On Thu, 2009-04-02 at 16:46 +0300, Benny Halevy wrote: > > >>>>>>>> Trond, please speak up if you want to remove CONFIG_NFS_V4_1 as well. > > >>>>>>>> On the client side minorversion 1 will be used only if the user > > >>>>>>>> explicitly asked for it with mount -o minorversion=1. > > >>>>>>> I'd feel more comfortable with being able to compile it out until the > > >>>>>>> stability of the code has been established. I'd certainly want to be > > >>>>>>> able to do that on the server side, since it has no other means to > > >>>>>>> restrict the protocol version should it turn out that NFSv4.1 has some > > >>>>>>> fatal condition. > > >>>>>> I think it's acceptable given an interface that allows choosing the > > >>>>>> supported minorversion at runtime (and that defaults 4.1 to off). > > >>>>> Is there such an interface on the server? > > >>>> That's the patch Benny just posted. It seems like a pretty simple > > >>>> extension of the existing version-choosing interface > > >>>> (/proc/fs/nfsd/versions), though I think the version he posted defaults > > >>>> 4.1 to on? I need to take another look. > > >>> That's right. This can be changed trivially, > > >>> but I'll have to find and work the reason why the settings reset on > > >>> service nfs restart, otherwise it will reset itself. > > >> Maybe you're starting and stopping the server using distro init scripts > > >> that load and unload the nfsd module? > > > > > > I'm using redhat's /etc/init.d/nfs > > > My impression was that it doesn't unload the nfsd module when the service > > > is stopped. However it does run modprobe on "start". I wonder if that's > > > causing the module to reload. > > > > Hmm, after "stop" nfsd is up and must stay up to keep serving > > /proc/fs/nfsd/versions. > > > > Giving modprobe the --first-time option reports: > > FATAL: Module nfsd already in kernel. > > Yeah, actually, /proc/fs/nfsd/versions is probably getting written > somewhere in there. That may be the effect of the --no-nfs-version > mountd argument. Whoops, sorry, rpc.nfsd: it should be the --no-nfs-version argument to rpc.nfsd. See nfssvc_versbits() in nfs-utils/support/nfs/nfssvc.c. --b.