Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750806AbVJVRTz (ORCPT ); Sat, 22 Oct 2005 13:19:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750797AbVJVRTz (ORCPT ); Sat, 22 Oct 2005 13:19:55 -0400 Received: from pentafluge.infradead.org ([213.146.154.40]:16351 "EHLO pentafluge.infradead.org") by vger.kernel.org with ESMTP id S1750790AbVJVRTy (ORCPT ); Sat, 22 Oct 2005 13:19:54 -0400 Date: Sat, 22 Oct 2005 18:19:43 +0100 From: Christoph Hellwig To: Sergey Panov Cc: Christoph Hellwig , Stefan Richter , linux-scsi@vger.kernel.org, Linux Kernel , Jeff Garzik , Luben Tuikov , andrew.patterson@hp.com, Christoph Hellwig , "Moore, Eric Dean" , jejb@steeleye.com, Linus Torvalds Subject: Re: ioctls, etc. (was Re: [PATCH 1/4] sas: add flag for locally attached PHYs) Message-ID: <20051022171943.GA7546@infradead.org> Mail-Followup-To: Christoph Hellwig , Sergey Panov , Stefan Richter , linux-scsi@vger.kernel.org, Linux Kernel , Jeff Garzik , Luben Tuikov , andrew.patterson@hp.com, Christoph Hellwig , "Moore, Eric Dean" , jejb@steeleye.com, Linus Torvalds References: <4359440E.2050702@pobox.com> <43595275.1000308@adaptec.com> <435959BE.5040101@pobox.com> <43595CA6.9010802@adaptec.com> <43596070.3090902@pobox.com> <43596859.3020801@adaptec.com> <43596F16.7000606@pobox.com> <435A1793.1050805@s5r6.in-berlin.de> <20051022105815.GB3027@infradead.org> <1129994910.6286.21.camel@sipan.sipan.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1129994910.6286.21.camel@sipan.sipan.org> User-Agent: Mutt/1.4.2.1i X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 951 Lines: 20 On Sat, Oct 22, 2005 at 11:28:30AM -0400, Sergey Panov wrote: > It is a mistake to think that you can not do a big rework and keep SCSI > sub-system stable. You just have to make sure the OLD way is supported > for as log as it is needed. No. Rewriting something from scratch is horrible engineering practice. It's impossible to very huge changes, small incremental changes OTOH allow easier planning, easier calculation of the risks and cost and most import better test coverage. There's nothing specific to scsi or linux kernel code about it. It'd suggest you read: http://www.joelonsoftware.com/articles/fog0000000069.html or various similar articles. Full scale rewrites almost never work out. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/