From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 16 May 2001 16:55:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 16 May 2001 16:55:02 -0400 Received: from vindaloo.ras.ucalgary.ca ([136.159.55.21]:4256 "EHLO vindaloo.ras.ucalgary.ca") by vger.kernel.org with ESMTP id ; Wed, 16 May 2001 16:54:52 -0400 Date: Wed, 16 May 2001 14:54:36 -0600 Message-Id: <200105162054.f4GKsaF10834@vindaloo.ras.ucalgary.ca> From: Richard Gooch To: "H. Peter Anvin" Cc: Geert Uytterhoeven , Alan Cox , Ingo Oeser , Linus Torvalds , Neil Brown , Jeff Garzik , Linux Kernel Mailing List , viro@math.psu.edu Subject: Re: LANANA: To Pending Device Number Registrants In-Reply-To: <3B02DD79.7B840A5B@transmeta.com> In-Reply-To: <200105152141.f4FLff300686@vindaloo.ras.ucalgary.ca> <200105161822.f4GIMo509185@vindaloo.ras.ucalgary.ca> <3B02D6AB.E381D317@transmeta.com> <200105162001.f4GK18X10128@vindaloo.ras.ucalgary.ca> <3B02DD79.7B840A5B@transmeta.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org H. Peter Anvin writes: > Richard Gooch wrote: > > > > H. Peter Anvin writes: > > > Richard Gooch wrote: > > > > Argh! What I wrote in text is what I meant to say. The code didn't > > > > match. No wonder people seemed to be missing the point. So the line of > > > > code I actually meant was: > > > > if (strcmp (buffer + len - 3, "/cd") != 0) { > > > > > > This is still a really bad idea. You don't want to tie this kind of > > > things to the name. > > > > Why do you think it's a bad idea? > > Because you are now, once again, tying two things that are > completely and utterly unrelated: device classification and device > name. It breaks every time someone comes out with a new device > which is "kind of like an old device, but not really," like > CD-writers (which was kind-of-like WORM, kind-of-like CD-ROM) and > DVD (kind-of-like CD)... But all devices which export a CD-ROM interface will do so. So the device node that is associated with the CD-ROM driver will export CD-ROM semantics, and the trailing name will be "/cd". Other interfaces a device exports, such as a CD-RW, appear as a different device node ("generic" for SCSI, because we have no CD-RW classification at this point). My scheme works already, and works reliably. Nothing had to be done to support the CD-ROM interface to CD-RW and DVD devices. Regards, Richard.... Permanent: rgooch@atnf.csiro.au Current: rgooch@ras.ucalgary.ca