So some interesting issues arise if we change the pseudo path of an export
or change the NFS versions supported.
What happens to state attached to files where the client will now get a
stale file handle? This may not be an issue if the Pseudo Path to an export
changes, but certainly would be a problem if v3 or v4 were dropped from the
export.
If it really is only a problem for dropping v3 or v4 we could do the version
specific state cleanup for the export.
Frank