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Date: Fri, 21 Aug 2009 09:27:00 +0800
From: Wu Fengguang <fengguang.wu@intel.com>
To: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
       LKML <linux-kernel@vger.kernel.org>
Subject: Re: mount.nfs: access denied by server
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References: <20090820071315.GA14765@localhost> <1250773349.5352.23.camel@heimdal.trondhjem.org>
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On Thu, Aug 20, 2009 at 09:02:29PM +0800, Trond Myklebust wrote:
> On Thu, 2009-08-20 at 15:13 +0800, Wu Fengguang wrote:
> > Hi,
> > 
> > After upgrading NFS client kernel to latest linux-next, NFS mount
> > failed:
> > 
> >         # mount -t nfs pxe:/cc /cc
> >         mount.nfs: access denied by server while mounting pxe:/cc
> > 
> >         # uname -a
> >         Linux hp 2.6.31-rc6-next-20090818 #61 SMP Thu Aug 20 14:46:10 CST 2009 x86_64 GNU/Linux 
> > 
> > However server log says OK:
> > 
> >         Aug 20 15:02:09 wu-t61 mountd[4599]: authenticated mount request from 192.168.11.6:973 for /cc (/cc)
> >         Aug 20 15:02:09 wu-t61 mountd[4599]: authenticated unmount request from 192.168.11.6:974 for /cc (/cc)
> > 
> > However-2: nfsroot can be mounted at boot time. Server kernel has always been 2.6.30.
> > 
> > Any ideas?
> > 
> > Thanks,
> > Fengguang
> 
> Can you try again after enabling mount debugging on the NFS client?
> 
> echo 512 > /proc/sys/sunrpc/nfs_debug

I used 1024 and found the mount failed here in nfs_walk_authlist():

        dfprintk(MOUNT, "NFS: server does not support requested auth flavor\ n");
        nfs_umount(request);

Thanks,
Fengguang