>> NFS is supposed to be stateless; you are supposed to design your
>> file handles in such a way that their validity survives anything
>> that commonly happens to your server - or at least, [...]

> True - now sort out how to export:
> - FAT filesystems
> - overlay mounts

"Don't do that, then".  I'd say, just acknowledge that if you
NFS-export filesystems that don't have something akin to di_gen fields,
you are going to significantly weaken NFS's (already relatively weak)
security (and maybe even break the protocol if the filesystem is R/W,
though I'd have to think about it to be sure).  There's no reason (say)
FAT filesystems _have_ to be exportable.

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