From: Marc Schmitt <mschmitt@inf.ethz.ch>
Subject: Re: Large export list leads to "Invalid argument" errors when
 executing 'exportfs -r'
Date: Thu, 28 Aug 2003 10:56:14 +0200
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Marc Schmitt wrote:

>Hi all,
>
>I'm using RedHat 7.3 as NFS server, kernel 2.4.18-27.7.xsmp, nfs-utils
>1.0.3.
>
>For each home directory, we make an entry into /etc/exports of the type:
>
>/export/home/<login> @<login>(rw,sync)
>
>The @<login> netgroups contain usually a whole bunch of machines in FQDN
>notation.
>
>This setup used to work fine, I could add a new entry to /etc/exports
>and issue 'exportfs -r' and everything would work as expected, the new
>home could be mounted on the machines in @<login>.
>
>Somehow, with /etc/exports growing more and more (currently 137
>entries), 'exportfs -r' started giving errors of the type:
>
><somehost part of @<login>>:/export/home/<login>: Invalid argument
>
>Currently, I get three of those error lines for three entries in
>/etc/exports. Lokks like it fails when it tries to unexport the entry,
>'exportsfs -r -v' shows:
>
>unexporting <somehost part of @<login>>:/export/home/<login> from kernel
><somehost part of @<login>>:/export/home/<login>: Invalid argument
>
>I made several tests, even when I delete the line in /etc/exports for
><login>, 'exportfs -r' will still give this error. I've deleted the
>corresponding entry in /var/lib/nfs/xtab but 'exportfs -r' would just
>add it again, obviously it's cached in the kernel table.
>
>Looking at 'showmount -a', I noticed that the server thinks, that
><somehost> has /export/home/<login> mounted, still. Even though the
>client does not have the home mounted from the server. I mounted the
>home on <somehost>, unmounted and issued 'exportfs -r' on the server and
>the error message "somehost part of @<login>>:/export/home/<login>:
>Invalid argument" did not appear again.
>
FYI: this problem went away with the update from nfs-utils 1.0.3 to 
1.0.5. Since the update, even though the export table has grown 
considerably again menawhile, I have not seen the "Invalid argument" 
error again.

Greetz
    Marc



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