From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262645AbTE0Fyg (ORCPT ); Tue, 27 May 2003 01:54:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262656AbTE0Fyg (ORCPT ); Tue, 27 May 2003 01:54:36 -0400 Received: from parcelfarce.linux.theplanet.co.uk ([195.92.249.252]:23500 "EHLO www.linux.org.uk") by vger.kernel.org with ESMTP id S262645AbTE0Fye (ORCPT ); Tue, 27 May 2003 01:54:34 -0400 Message-ID: <3ED300A8.4000405@pobox.com> Date: Tue, 27 May 2003 02:07:36 -0400 From: Jeff Garzik Organization: none User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2.1) Gecko/20021213 Debian/1.2.1-2.bunk X-Accept-Language: en MIME-Version: 1.0 To: Linus Torvalds CC: linux-kernel@vger.kernel.org Subject: Re: [BK PATCHES] add ata scsi driver References: In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Linus Torvalds wrote: > On Mon, 26 May 2003, Jeff Garzik wrote: > >>Correct, but precisely by saying that, you're missing something. > > > You're missing _my_ point. > > >>The SCSI midlayer provides infrastructure I need -- which is not >>specific to SCSI at all. > > > If it isn't specific to SCSI, then it sure as hell shouldn't BE THERE! > > My point is that it's _wrong_ to make non-SCSI drivers use the SCSI layer, > because that shows that something is misdesigned. > > And I bet there isn't all that much left that really helps. > > You adding more "pseudo-SCSI" crap just _makes_things_worse. It does not > advance anything, it regresses. As you see from Alan's message and others, it isn't pseudo-SCSI. Besides what he mentioned, there is Serial Attached SCSI (SAS), where a host controller can simultaneously support SAS disks and SATA disks. So it's either an IDE driver that does SCSI, or a SCSI driver that does IDE, or a driver that's in both IDE and SCSI subsystems, or... ? Having fun yet? :) > On 27 May 2003, Alan Cox wrote: >>> I actually think thats a positive thing. It means 2.5 drivers/scsi is >>> now very close to being the "native queueing driver" with some >>> additional default plugins for doing scsi scanning, scsi error recovery >>> and a few other scsi bits. > > Hey, that may well be the way to go, in which case the core stuff should > be renamed and moved off somewhere else. Leaving drivers/scsi with just > the actual low-level SCSI drivers. For all these reasons, I continue to maintain that starting out as a SCSI driver, and then evolving, is the best route. The non-SCSI parts leave drivers/scsi, as they should. The SCSI parts stay. The SCSI mid-layer gets smaller. All the while, the driver continues to work. Everybody wins. Starting out as a native block driver and _then_ adding SCSI support and native queueing and jazz does not sound even remotely like a good path to follow. Jeff