From: Matthew Wilcox <matthew@wil.cx>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Douglas Gilbert <dougg@torque.net>, Bodo Eggert <7eggert@gmx.de>,
linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Move SG_GET_SCSI_ID from sg to scsi
Date: Mon, 27 Mar 2006 10:25:30 -0700 [thread overview]
Message-ID: <20060327172530.GH3486@parisc-linux.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0603270854570.15714@g5.osdl.org>
On Mon, Mar 27, 2006 at 09:15:35AM -0800, Linus Torvalds wrote:
> On Mon, 27 Mar 2006, Douglas Gilbert wrote:
> >
> > There are two things that really count:
> > 1) the identifier (preferably a world wide unique name)
> > of the logical unit that is being addressed
> > 2) a topological description of how that logical unit
> > is connected
>
> And "SCSI ID" doesn't describe either.
>
> > Linux's <hctl> may be a ham fisted way of describing
> > a path through a topology, but it easily beats /dev/sdabc
> > and /dev/sg4711 .
>
> Sure, you can easily beat it by selecting what you compare it against.
>
> But face it, /dev/sdabc or /dev/sg4711 simply isn't what you should
> compare against. What you should compare against is
>
> /dev/cdrom
> /sys/bus/ide/devices/0.0/block:hda/dev
> /dev/uuid/3d9e6e8dfaa3d116
> ..
>
> and a million OTHER ways to specify which device you're interested in.
>
> The fact is, they can potentially all do the SCSI command set. And a "SCSI
> ID" makes absolutely zero sense for them (those three devices may be the
> same device, they may not be, they might be on another machine, who
> knows..)
If this ioctl is generally supported, then you'll be able to find out if
they're all the same ;-)
next prev parent reply other threads:[~2006-03-27 17:25 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-26 19:28 [PATCH] Move SG_GET_SCSI_ID from sg to scsi Bodo Eggert
2006-03-26 19:51 ` Arjan van de Ven
2006-03-26 20:08 ` Matthew Wilcox
2006-03-26 20:41 ` Arjan van de Ven
2006-03-26 20:05 ` Matthew Wilcox
2006-03-27 10:11 ` Bodo Eggert
2006-03-27 15:20 ` Matthew Wilcox
2006-03-27 15:40 ` James Bottomley
2006-03-26 22:30 ` Linus Torvalds
2006-03-26 23:19 ` Jan Engelhardt
2006-03-27 0:06 ` Linus Torvalds
2006-03-27 11:42 ` Bodo Eggert
2006-03-28 9:43 ` Matthias Andree
2006-03-27 15:03 ` Douglas Gilbert
2006-03-27 17:15 ` Linus Torvalds
2006-03-27 17:25 ` Matthew Wilcox [this message]
2006-03-27 17:43 ` Linus Torvalds
2006-03-27 19:54 ` Alan Cox
2006-03-27 21:29 ` Douglas Gilbert
2006-03-28 7:37 ` Stefan Richter
2006-03-28 14:17 ` Jan Engelhardt
2006-03-26 23:09 ` Stefan Richter
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