From: Paul Ruizendaal <pnr@planet.nl>
To: Thomas Paulsen <thomas.paulsen@firemail.de>
Cc: tuhs@minnie.tuhs.org
Subject: Re: [TUHS] 8th Edition timeline
Date: Wed, 8 Apr 2020 22:13:29 +0200 [thread overview]
Message-ID: <0A39F8F1-C1C3-408F-9715-1D8B9C19A00C@planet.nl> (raw)
In-Reply-To: <b86ac02f64adfbc237a01135f76a305d@firemail.de>
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On Apr 8, 2020, at 8:58 PM, Thomas Paulsen <thomas.paulsen@firemail.de> wrote:
>
>> As was suggested on the list, I’ve reached out to Peter Weinberger to better
>> understand the time line of the File System Switch and the 8th edition network
> f>ile system.
>
> 'Introduced with System V Release 3.0, the File System Switch (FSS) architecture introduced a framework under which multiple different filesystem types could coexist in parallel.'
> https://www.oreilly.com/library/view/unix-filesystems-evolution/9780471456759/chap07-sec003.html <https://www.oreilly.com/library/view/unix-filesystems-evolution/9780471456759/chap07-sec003.html>
Thanks for that link!
The SysV R3 source floats around on the web. Its FSS is very different from what is in 8th edition.
In 8th edition the switch has 11 entries (i.e. a file system is an object with 11 virtual methods).
https://github.com/Alhadis/Research-Unix-v8/blob/master/v8/usr/sys/h/conf.h
I have never really studied R3 but at quick inspection the FSS there has 27 (!) entries and seems to be more a sys call switch.
In 10th edition it is still 11 entries, although some refactoring has taken place. Also later work from Research keeps it concise: the 9P protocol from Plan 9 has 14 messages.
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next prev parent reply other threads:[~2020-04-08 20:14 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-29 12:27 Paul Ruizendaal
2020-03-29 14:04 ` arnold
2020-03-29 18:12 ` Paul Ruizendaal
2020-03-29 21:48 ` Rob Pike
2020-03-30 7:43 ` Paul Ruizendaal
2020-03-30 9:06 ` Rob Pike
2020-04-04 12:56 ` emanuel stiebler
2020-04-04 19:57 ` Noel Hunt
2020-04-04 21:32 ` Rob Pike
2020-04-04 22:39 ` Noel Hunt
2020-04-05 1:38 ` aksr
2020-04-05 13:17 ` emanuel stiebler
2020-03-30 13:26 ` Clem Cole
2020-03-30 13:38 ` reed
2020-03-30 14:41 ` Clem Cole
2020-03-30 15:06 ` [TUHS] Sytek (was Re: 8th Edition timeline) Jon Forrest
2020-03-30 16:02 ` [TUHS] 8th Edition timeline Paul Ruizendaal
2020-03-30 19:31 ` Clem Cole
2020-03-31 2:44 ` Paul Ruizendaal
2020-04-08 18:50 ` Paul Ruizendaal
2020-04-08 18:58 ` Thomas Paulsen
2020-04-08 20:13 ` Paul Ruizendaal [this message]
2020-03-30 6:25 ` Paul Ruizendaal
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