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From: Paul Ruizendaal via TUHS <>
Subject: [TUHS] Re: RFS (was Re: Re: forgotten versions)
Date: Mon, 20 Jun 2022 14:28:06 +0200	[thread overview]
Message-ID: <> (raw)

> I don't know the exact history of RFS a la System V, but I
> don't think it was Peter Weinberger's stuff, and it certainly
> wasn't his code.

Peter’s code is available in the V8 and V9 trees on TUHS.

The Sys V repositories on Github appear to include RFS code in all of R3.0, R3.1 and R3.2.

At first glance, it seems quite different from the V8/V9 code.

> Peter, being a self-described fan of cheap hacks, also wasn't
> inclined to spend much time thinking about general abstractions;
> in effect he just turned various existing kernel subroutines
> (when applied to a network file system) into RPCs.  The
> structure of the file system switch was rather UNIX-specific,
> reflecting that.

Yes, well put. I’ve back ported his filesystem switch to V6/V7 and it is very light touch: on the PDP11 it added only some 500 bytes of kernel code (after some refactoring).

With hindsight it seems such a logical idea, certainly in a context where the labs were experimenting with remote system calls in the mid 70’s (Heinz Lycklama's work on satellite Unix) and early 80’s (Gottfried Luderer et al. on distributed Unix — another forgotten version). It is such a powerful abstraction, but apparently very elusive to invent.


             reply	other threads:[~2022-06-20 12:28 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-20 12:28 Paul Ruizendaal via TUHS [this message]
2022-06-20 21:53 ` Derek Fawcus
  -- strict thread matches above, loose matches on Subject: below --
2022-06-20  0:44 Norman Wilson
2022-06-20  1:02 ` George Michaelson
2022-06-20  4:50 ` arnold
2022-06-18  0:35 [TUHS] Re: forgotten versions Douglas McIlroy
2022-06-18  5:00 ` Kevin Bowling
2022-06-19 20:46   ` [TUHS] RFS (was Re: Re: forgotten versions) Derek Fawcus
2022-06-19 23:07     ` [TUHS] " Larry McVoy
2022-06-19 23:19       ` Brad Spencer
2022-06-20  5:03         ` Arno Griffioen via TUHS
2022-06-20  6:53           ` Theodore Ts'o

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