From: Mike Anderson <mike.anderson@us.ibm.com>
To: Andries.Brouwer@cwi.nl
Cc: rgooch@ras.ucalgary.ca, torvalds@transmeta.com,
alan@lxorguk.ukuu.org.uk, geert@linux-m68k.org,
hpa@transmeta.com, ingo.oeser@informatik.tu-chemnitz.de,
jgarzik@mandrakesoft.com, linux-kernel@vger.kernel.org,
neilb@cse.unsw.edu.au, viro@math.psu.edu
Subject: Re: LANANA: To Pending Device Number Registrants
Date: Wed, 16 May 2001 18:18:45 -0700 [thread overview]
Message-ID: <20010516181845.A20663@us.ibm.com> (raw)
In-Reply-To: <UTC200105170018.CAA30316.aeb@vlet.cwi.nl>
In-Reply-To: <UTC200105170018.CAA30316.aeb@vlet.cwi.nl>; from Andries.Brouwer@cwi.nl on Thu, May 17, 2001 at 02:18:20AM +0200
Andries.Brouwer@cwi.nl [Andries.Brouwer@cwi.nl] wrote:
> In principle the kernel could just number the devices it sees 1,2,...
> and export information about them, so that user space can choose
> the right number.
> The part about exporting information is good. User space needs to
> be able to ask if a certain beast is a CD reader, and if so what
> manufacturer and model.
> But the part about numbering 1,2,... may not be good enough, e.g.
> because it does not survive reboots. If we remain Unix-like and use
> device nodes in user space to pair a file name with a number, then
> it would be very nice if the number encoded the device path uniquely.
> Many programs expect this.
> It cannot be done in all cases, but a good approximation is obtained
> if the number is a hash of the device path. In so far the hash is
> collision free we obtain numbers that stay unique over a reboot.
>
> Andries
I disagree that the kernel should apply sequence numbers as devices are
found or hash path information into the device name.
I am unclear of the need for the hashing the path into the name.
In the ptx operating system I previously worked on we ID'd everything
that we could get a UUID from and one's that we could not we generated a
pseudo one. We also split the UUID space up on config type. This is
similar to the discussion in Andreas's mail. Non-id'd devices could
possibly slip, but ID'd ones did not. In user space we allowed the user
to select any name for a device (the user space to kernel connection was
made by UUID. The solution worked on SCSI and FC based devices (Linux
obviously deals with many more device name spaces).
I thought with devfs, devreg, and non allocated major, minors. A
similar capability would be possible. The "/dev" usage would not need
to know the path, but methods would be available to make the
relationship when needed.
-Mike
--
Michael Anderson
mike.anderson@us.ibm.com
next prev parent reply other threads:[~2001-05-17 1:25 UTC|newest]
Thread overview: 319+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-05-17 0:18 LANANA: To Pending Device Number Registrants Andries.Brouwer
2001-05-17 1:18 ` Mike Anderson [this message]
2001-05-17 2:46 ` Willem Konynenberg
2001-05-17 9:42 ` Michael Meissner
-- strict thread matches above, loose matches on Subject: below --
2001-05-17 20:00 Brian Wheeler
2001-05-18 8:24 ` Tim Jansen
2001-05-18 8:27 ` Alan Cox
2001-05-18 14:06 ` Brian Wheeler
2001-05-17 8:58 Andries.Brouwer
2001-05-17 0:09 Dunlap, Randy
2001-05-16 15:06 Khachaturov, Vassilii
2001-05-16 13:13 Jesse Pollard
2001-05-16 13:11 mike_phillips
2001-05-18 18:23 ` Mark H. Wood
2001-05-16 9:56 Chemolli Francesco (USI)
2001-05-16 11:18 ` Helge Hafting
2001-05-16 12:09 ` Thomas Kotzian
2001-05-16 18:58 ` Heinz J. Mauelshagen
2001-05-17 6:35 ` Albert D. Cahalan
2001-05-17 9:39 ` Guest section DW
2001-05-21 7:16 ` Albert D. Cahalan
2001-05-18 15:57 ` Heinz J. Mauelshagen
2001-05-16 12:12 ` Oystein Viggen
2001-05-16 12:45 ` Josh Fryman
2001-05-16 13:28 ` Helge Hafting
2001-05-16 18:37 ` Hacksaw
2001-05-16 16:30 ` Miles Lane
2001-05-16 16:18 ` Michael Meissner
2001-05-18 14:17 ` Stephen C. Tweedie
2001-05-19 5:29 ` Chris Wedgwood
2001-05-19 16:43 ` Stephen C. Tweedie
2001-05-19 18:21 ` Hans Reiser
2001-05-19 20:20 ` Michael Meissner
2001-05-21 13:34 ` Stephen C. Tweedie
2001-05-16 15:14 ` Jonathan Lundell
2001-05-16 0:01 Bingner Sam J. Contractor RSIS
2001-05-16 11:08 ` Alex Bligh - linux-kernel
2001-05-15 23:49 Bingner Sam J. Contractor RSIS
2001-05-16 7:10 ` Andrzej Krzysztofowicz
2001-05-16 18:25 ` Richard Gooch
2001-05-15 23:16 David Brownell
2001-05-15 23:35 ` Alexander Viro
2001-05-16 0:13 ` David Brownell
2001-05-15 23:56 ` Tim Jansen
2001-05-16 0:41 ` Miles Lane
2001-05-16 16:55 ` James Simmons
2001-05-17 6:12 ` Miles Lane
2001-05-17 12:07 ` Oliver Neukum
2001-05-17 16:34 ` Tim Jansen
2001-05-17 17:03 ` David Brownell
2001-05-17 16:17 ` David Brownell
2001-05-17 16:56 ` James Simmons
2001-05-15 22:49 David Brownell
2001-05-15 22:21 David Brownell
2001-05-15 23:17 ` Andreas Dilger
2001-05-15 23:35 ` David Brownell
2001-05-15 23:55 ` Jonathan Lundell
2001-05-17 18:39 ` Mark H. Wood
2001-05-15 21:27 Timothy A. Seufert
2001-05-15 21:38 ` Alexander Viro
2001-05-16 7:23 ` Geert Uytterhoeven
2001-05-16 15:50 ` Mo McKinlay
2001-05-15 21:26 Andrzej Krzysztofowicz
[not found] <mng==Pine.LNX.4.10.10105151151380.22038-100000@www.transvirtual.com>
[not found] ` <mng==Pine.LNX.4.21.0105151043360.2112-100000@penguin.transmeta.com>
2001-05-15 20:59 ` Jens-Uwe Mager
2001-05-15 17:00 David Balazic
2001-05-16 17:02 ` Hacksaw
2001-05-16 17:19 ` Mathieu Chouquet-Stringer
2001-05-16 20:05 ` James Simmons
2001-05-16 20:13 ` Mathieu Chouquet-Stringer
2001-05-16 20:16 ` James Simmons
2001-05-16 20:21 ` Mathieu Chouquet-Stringer
2001-05-14 19:19 H. Peter Anvin
2001-05-14 19:36 ` Jeff Garzik
2001-05-14 19:57 ` H. Peter Anvin
2001-05-14 20:04 ` Jeff Garzik
2001-05-14 20:09 ` Alan Cox
2001-05-14 20:24 ` Jeff Garzik
2001-05-14 20:27 ` H. Peter Anvin
2001-05-14 22:21 ` Alan Cox
2001-05-14 23:43 ` Jan Niehusmann
2001-05-14 23:48 ` Alan Cox
2001-05-14 20:29 ` Linus Torvalds
2001-05-14 20:55 ` Neil Brown
2001-05-14 21:20 ` Alan Cox
2001-05-14 21:37 ` Neil Brown
2001-05-14 21:24 ` Jeff Garzik
2001-05-14 21:33 ` Neil Brown
2001-05-15 6:41 ` Linus Torvalds
2001-05-15 8:57 ` Alan Cox
2001-05-15 9:08 ` Linus Torvalds
2001-05-15 9:26 ` Alan Cox
2001-05-15 9:49 ` Alexander Viro
2001-05-15 9:51 ` Alan Cox
2001-05-15 10:12 ` Alexander Viro
2001-05-15 10:36 ` Alan Cox
2001-05-15 15:16 ` Linus Torvalds
2001-05-15 20:55 ` Alan Cox
2001-05-15 15:10 ` Linus Torvalds
2001-05-15 15:29 ` Alexander Viro
2001-05-15 17:21 ` James Simmons
2001-05-15 17:25 ` Alexander Viro
2001-05-15 17:29 ` James Simmons
2001-05-15 17:32 ` Alexander Viro
2001-05-15 17:44 ` James Simmons
2001-05-15 18:18 ` Ingo Oeser
2001-05-15 18:36 ` James Simmons
2001-05-15 18:42 ` Alexander Viro
2001-05-16 8:29 ` Helge Hafting
2001-05-16 17:16 ` James Simmons
2001-05-15 21:46 ` Chip Salzenberg
2001-05-15 21:50 ` James Simmons
2001-05-15 18:04 ` Linus Torvalds
2001-05-15 18:58 ` Johannes Erdfelt
2001-05-15 19:17 ` Linus Torvalds
2001-05-15 19:23 ` H. Peter Anvin
2001-05-15 19:43 ` Johannes Erdfelt
2001-05-15 21:58 ` Chip Salzenberg
2001-05-16 8:51 ` Helge Hafting
2001-05-17 10:20 ` Pavel Machek
2001-05-18 17:32 ` Johannes Erdfelt
2001-05-19 10:21 ` Pavel Machek
2001-05-19 8:18 ` Kai Henningsen
2001-05-17 20:40 ` Kai Henningsen
2001-05-17 22:46 ` Johannes Erdfelt
2001-05-15 20:03 ` James Simmons
2001-05-15 20:06 ` H. Peter Anvin
2001-05-15 20:28 ` James Simmons
2001-05-15 21:20 ` Nicolas Pitre
2001-05-15 21:28 ` James Simmons
2001-05-15 21:31 ` H. Peter Anvin
2001-05-15 21:43 ` Johannes Erdfelt
2001-05-15 21:49 ` James Simmons
2001-05-16 7:05 ` Kai Henningsen
2001-05-15 22:07 ` Alan Cox
2001-05-16 7:11 ` Kai Henningsen
2001-05-16 7:43 ` Alexander Viro
2001-05-16 9:45 ` Malcolm Beattie
2001-05-16 0:59 ` Daniel Phillips
2001-05-16 1:34 ` Nicolas Pitre
2001-05-16 1:51 ` Jonathan Lundell
2001-05-16 11:34 ` Erik Mouw
2001-05-17 17:07 ` Eric W. Biederman
2001-05-17 19:30 ` Jeff Randall
2001-05-16 7:17 ` Kai Henningsen
2001-05-15 20:14 ` Alexander Viro
2001-05-15 20:30 ` H. Peter Anvin
2001-05-15 20:41 ` Alexander Viro
2001-05-15 20:51 ` Linus Torvalds
2001-05-16 1:01 ` Daniel Phillips
2001-05-16 1:04 ` H. Peter Anvin
2001-05-15 20:37 ` Linus Torvalds
2001-05-15 20:56 ` Jeff Garzik
2001-05-15 21:22 ` James Simmons
2001-05-17 10:42 ` Pavel Machek
2001-05-18 18:32 ` James Simmons
2001-05-15 20:57 ` James Simmons
2001-05-17 20:33 ` Kai Henningsen
2001-05-15 20:17 ` H. Peter Anvin
2001-05-15 21:59 ` Chip Salzenberg
2001-05-15 22:51 ` James Simmons
2001-05-15 21:22 ` Jan Harkes
2001-05-15 21:39 ` Martin Dalecki
2001-05-15 18:02 ` Ingo Oeser
2001-05-15 19:31 ` Richard Gooch
2001-05-15 19:37 ` H. Peter Anvin
2001-05-15 20:10 ` Alan Cox
2001-05-15 21:41 ` Richard Gooch
2001-05-15 21:47 ` Alexander Viro
2001-05-15 22:14 ` Alan Cox
2001-05-15 22:24 ` Richard Gooch
2001-05-15 22:27 ` H. Peter Anvin
2001-05-15 22:38 ` Alexander Viro
2001-05-15 22:28 ` Richard Gooch
2001-05-15 22:32 ` H. Peter Anvin
2001-05-15 22:33 ` Alan Cox
2001-05-16 7:21 ` Geert Uytterhoeven
2001-05-16 18:22 ` Richard Gooch
2001-05-16 19:36 ` H. Peter Anvin
2001-05-16 20:01 ` Richard Gooch
2001-05-16 20:05 ` H. Peter Anvin
2001-05-16 20:18 ` Linus Torvalds
2001-05-16 20:44 ` Richard Gooch
2001-05-16 20:54 ` Richard Gooch
2001-05-16 21:36 ` H. Peter Anvin
2001-05-16 22:11 ` Ingo Oeser
2001-05-16 22:13 ` H. Peter Anvin
2001-05-16 22:21 ` Jens Axboe
2001-05-16 23:03 ` Richard Gooch
2001-05-16 23:25 ` H. Peter Anvin
2001-05-16 23:37 ` Richard Gooch
2001-05-16 23:38 ` H. Peter Anvin
2001-05-16 23:41 ` Richard Gooch
2001-05-16 23:43 ` H. Peter Anvin
2001-05-16 23:49 ` Richard Gooch
2001-05-16 23:55 ` H. Peter Anvin
2001-05-17 21:12 ` Kai Henningsen
2001-05-17 21:06 ` Kai Henningsen
2001-05-16 23:51 ` Alan Cox
2001-05-16 23:58 ` Richard Gooch
2001-05-17 0:12 ` H. Peter Anvin
2001-05-17 0:24 ` Alan Cox
2001-05-17 1:35 ` Jeff Garzik
2001-05-17 9:33 ` Guest section DW
2001-05-15 20:58 ` Alan Cox
2001-05-15 21:42 ` Chip Salzenberg
2001-05-15 21:46 ` Alexander Viro
2001-05-15 21:57 ` H. Peter Anvin
2001-05-15 22:07 ` Chip Salzenberg
2001-05-15 22:11 ` H. Peter Anvin
2001-05-15 22:18 ` Alan Cox
2001-05-15 21:40 ` Chip Salzenberg
2001-05-15 22:12 ` Alan Cox
2001-05-15 22:19 ` H. Peter Anvin
2001-05-15 22:28 ` Alan Cox
2001-05-15 22:34 ` H. Peter Anvin
2001-05-15 23:39 ` Chip Salzenberg
2001-05-16 20:37 ` Alan Cox
2001-05-15 22:49 ` James Simmons
2001-05-15 23:22 ` Kenneth Johansson
2001-05-15 9:28 ` Alan Cox
2001-05-15 15:15 ` Linus Torvalds
2001-05-15 15:19 ` Jeff Garzik
2001-05-15 15:45 ` Linus Torvalds
2001-05-15 17:27 ` James Simmons
2001-05-15 17:43 ` Linus Torvalds
2001-05-15 18:04 ` Jeff Garzik
2001-05-15 18:15 ` Linus Torvalds
2001-05-15 19:36 ` Jonathan Lundell
2001-05-15 20:18 ` Linus Torvalds
2001-05-15 20:26 ` Dan Hollis
2001-05-15 22:14 ` Miles Lane
2001-05-15 21:29 ` Alex Bligh - linux-kernel
2001-05-15 21:36 ` Linus Torvalds
2001-05-15 22:03 ` Jeff Mahoney
2001-05-15 22:42 ` Andreas Dilger
2001-05-15 21:51 ` Mark Frazer
2001-05-15 22:35 ` Bob Glamm
2001-05-16 0:56 ` Jonathan Lundell
2001-05-16 2:31 ` Andrew Morton
2001-05-16 6:56 ` Jonathan Lundell
2001-05-16 8:02 ` Vojtech Pavlik
2001-05-16 12:20 ` Bogdan Costescu
2001-05-16 14:37 ` Jonathan Lundell
2001-05-16 14:57 ` Vojtech Pavlik
2001-05-16 15:24 ` Jonathan Lundell
2001-05-16 7:24 ` Geert Uytterhoeven
2001-05-16 23:26 ` Alan Cox
2001-05-16 23:31 ` H. Peter Anvin
2001-05-16 23:53 ` Linus Torvalds
2001-05-17 0:21 ` Alan Cox
2001-05-17 7:57 ` Geert Uytterhoeven
2001-05-17 16:26 ` James Simmons
2001-05-17 6:43 ` Thomas Sailer
2001-05-17 16:58 ` Tim Jansen
2001-05-17 17:18 ` James Simmons
2001-05-17 17:29 ` Geert Uytterhoeven
2001-05-17 17:41 ` Tim Jansen
2001-05-17 22:03 ` Oliver Neukum
2001-05-16 23:52 ` Linus Torvalds
2001-05-17 1:26 ` Joel Becker
2001-05-16 16:04 ` Michael Meissner
2001-05-16 21:36 ` Andreas Dilger
2001-05-18 2:18 ` Jonathan Lundell
2001-05-19 17:36 ` Jonathan Lundell
2001-05-20 9:37 ` Eric W. Biederman
2001-05-20 14:16 ` Chris Wedgwood
2001-05-20 15:54 ` Jonathan Lundell
2001-05-20 15:57 ` Jonathan Lundell
2001-05-19 17:45 ` Jonathan Lundell
2001-05-19 8:42 ` Kai Henningsen
2001-05-17 21:23 ` Kai Henningsen
2001-05-15 19:33 ` Kai Henningsen
2001-05-16 7:25 ` Geert Uytterhoeven
2001-05-15 18:19 ` James Simmons
2001-05-15 20:23 ` Alan Cox
2001-05-15 20:28 ` H. Peter Anvin
2001-05-15 21:52 ` Andreas Dilger
2001-05-15 20:02 ` Dan Hollis
2001-05-15 11:44 ` Neil Brown
2001-05-15 15:34 ` Linus Torvalds
2001-05-16 1:00 ` Daniel Phillips
2001-05-16 12:58 ` Jens Axboe
2001-05-16 3:25 ` Neil Brown
2001-05-15 15:51 ` John Fremlin
2001-05-14 21:09 ` Andi Kleen
2001-05-14 21:11 ` Rik van Riel
2001-05-14 21:23 ` Alan Cox
2001-05-15 0:33 ` Rik van Riel
2001-05-16 9:04 ` Ingo Oeser
2001-05-14 21:16 ` Alan Cox
2001-05-14 22:05 ` Alexander Viro
2001-05-14 22:30 ` Alan Cox
2001-05-14 22:48 ` Alexander Viro
2001-05-14 22:46 ` Alan Cox
2001-05-14 22:53 ` Alexander Viro
2001-05-14 22:54 ` H. Peter Anvin
2001-05-14 23:00 ` Alexander Viro
2001-05-14 22:58 ` Alan Cox
2001-05-14 23:29 ` Alexander Viro
2001-05-15 4:20 ` God
2001-05-14 23:39 ` Richard Gooch
2001-05-14 23:18 ` Arjan van de Ven
2001-05-14 23:20 ` Alan Cox
2001-05-15 18:57 ` Kai Henningsen
2001-05-15 5:56 ` Oliver Neukum
2001-05-15 5:59 ` H. Peter Anvin
2001-05-14 22:55 ` Alan Cox
2001-05-14 23:11 ` Dan Hollis
2001-05-14 23:19 ` Alan Cox
2001-05-14 23:23 ` Alexander Viro
2001-05-15 1:10 ` Keith Owens
2001-05-14 23:34 ` Richard Gooch
2001-05-14 21:18 ` Alan Cox
2001-05-14 23:32 ` Richard Gooch
2001-05-14 20:09 ` Richard Gooch
2001-05-14 20:14 ` Jeff Garzik
2001-05-15 17:37 ` Pavel Machek
2001-05-17 11:32 ` Alan Cox
2001-05-16 15:58 ` Kurt Garloff
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