20 Jun
2022
20 Jun
'22
6:28 p.m.
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.
Paul
21 Jun
21 Jun
3:53 a.m.
New subject: RFS (was Re: Re: forgotten versions)
On Mon, Jun 20, 2022 at 02:28:06PM +0200, Paul Ruizendaal via TUHS wrote:
Interesting, given the earlier mention of SMB. As I recall, the MS-DOS Redirector
interface is sort of at a similar level, but probably a lot more messy in terms of how the
internal 'interfaces' are exposed.
That was in DOS 3.0, which according to Wikipedia was released in April '85, with 8th
edition being around Feb '85, I guess they may have been done in parallel?
DF
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.
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Paul Ruizendaal