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    SubjectRe: NFS regression in v3.5-rc1: mount.nfs yells about incorrect mount option
    On Fri, Jun 08, 2012 at 09:20:02AM -0400, Bryan Schumaker wrote:
    > On 06/08/2012 09:03 AM, Joerg Roedel wrote:
    > > On Thu, Jun 07, 2012 at 11:54:24AM -0400, Bryan Schumaker wrote:
    > >> On 06/07/2012 11:50 AM, Joerg Roedel wrote:
    > >>> mount -o nfsvers=3 ...
    > >>
    > >> What about `mount -o vers=4 ...`? I'm compiling a kernel right now to
    > >> see if I can reproduce this, what NFS .config options do you have set?
    > >> (`cat .config | grep CONFIG_NFS_` should be good enough).
    > >
    > > Okay, I tracked it down somewhat. The problem is that the nfs-version
    > > is not set in my case so that data->version in nfs_init_server is 0. The
    > > function returns -EPROTONOSUPPORT in this case which causes the mount
    > > to fail. The evil commit is db8333519 and reverting it fixes the issue
    > > for me. Patch attached.
    > Thanks! I wasn't able to reproduce this on Ubuntu 12.04, so now I'm
    > setting up 10.04 to see if that makes a difference. I'd like to
    > understand what's going on (and why my other patch didn't fix this
    > problem) before reverting.

    Your other patch only touched the nfs4 path, but in my setup nfs3 was in
    use. Therefore the patch didn't help. I just figured out that
    nfs_fs_mount is shared between nfs23 and nfs4, so the first patch
    probably breaks nfs4. I send another one which takes this into account.



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