Re: [pnfs] [PATCH v2 06/47] nfsd41: Add Kconfig symbols for NFSv4.1

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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 <bhalevy@xxxxxxxxxxx> wrote:
> > > On Apr. 02, 2009, 19:54 +0300, "J. Bruce Fields" <bfields@xxxxxxxxxxxx> wrote:
> > >> On Thu, Apr 02, 2009 at 07:34:29PM +0300, Benny Halevy wrote:
> > >>> On Apr. 02, 2009, 17:31 +0300, "J. Bruce Fields" <bfields@xxxxxxxxxxxx> 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.
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