[9fans] nfsserver

[forsyth@caldo.demon.co.uk forsyth@caldo.demon.co.uk]

i've used nfsserver (with the changes on my web site)
with IRIX 5.3, IRIX 6.2 and Solaris 2.something
without any trouble beyond things inherent in the use of NFS.

for instance, mv sometimes won't work as-is on IRIX because SGI implemented the NFS specification
precisely, and mapped error codes not in the v2 NFS spec to EIO
(or some such thing).  that's fine, but the official list doesn't include
EXDEV, even though Sun's implementation can and does return it.
that in turn causes some peculiar diagnostics to be printed in some
cases under IRIX.

on the other hand, both Solaris and IRIX 6.2 seem to try v3 then fall back
to v2 automatically.  i'm not certain, but i believe v3 is the default on both
systems.  i didn't see much point in implementing v3 at the time.

the only other problem i recall was a political one: some Unix users objected to
having to authenticate themselves to the server.  i'd also have liked a version
of 9auth for windows.