Re: Status of mount.nfs

["Steinar H. Gunderson" <sesse@debian.org>]

On Mon, Jul 16, 2007 at 11:13:14AM +1000, Neil Brown wrote:
> Is this simply because you were mounting NFS filesystems before
> running statd?  In that case, maybe we should say that it "highlighted
> that your NFS mounting on boot was already broken" ?? :-)

Yes, we were. I'm in the process of patching the boot process now, so you
could probably shed light on a related issue: Do we need to start portmap
before statd or not? The comments in the old code is slightly cryptic :-)

>>                          Also, it seems to be less forgiving about portmapper
>>    registration; cfs (an encrypted filesystem based off NFS, it seems) sets
>>    up a server on port 3049 and expects "-o port=3049,nfsvers=2" to work. The
>>    new mount.nfs searches for a portmapper unless the udp option is also
>>    correctly set.
> I'm a bit confused here.  I would expect that to avoid portmap being
> used, you would need to set both 'port' and 'mountport' on the command
> line.  It shouldn't have anything to do with whether UDP is set.  Can
> you say a bit more about what you discovered here?

Well, I have no idea how these things work at all, I just traced through the
code and saw what would make it work :-) cfs runs as its own NFS daemon, on
port 3049, but does not seem to register with the portmapper. The mount
command given, without "-o udp", gives:

  mount: mount to NFS server 'localhost' failed: RPC Error: Success.

The error seems to originate from probe_nfsport(), which also has a line
saying

  if (pmap->pm_vers && pmap->pm_prot && pmap->pm_port)
          return 1;

which indicates that if version+protocol+port are all set beforehand, don't
probe -- and indeed, that works. I stopped debugging the issue there.

>>  - If you forget to install it suid (we strip suid bits automatically) you
>>    will of course break user mounts. :-)
> and if you forget to install the new man pages, you will have
> incomplete documentation :-)
> nfs-common  1:1.1.0-9  does not have mount.nfs and umount.nfs man pages.

Thanks, nice catch. I'll be sure to fix that in the next upload.

/* Steinar */
-- 
Homepage: http://www.sesse.net/

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