Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030425AbVKPTVP (ORCPT ); Wed, 16 Nov 2005 14:21:15 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030447AbVKPTVO (ORCPT ); Wed, 16 Nov 2005 14:21:14 -0500 Received: from ns.virtualhost.dk ([195.184.98.160]:48216 "EHLO virtualhost.dk") by vger.kernel.org with ESMTP id S1030425AbVKPTVL (ORCPT ); Wed, 16 Nov 2005 14:21:11 -0500 Date: Wed, 16 Nov 2005 20:22:05 +0100 From: Jens Axboe To: Bartlomiej Zolnierkiewicz Cc: Mike Christie , Jeff Garzik , Tejun Heo , linux-ide@vger.kernel.org, lkml , SCSI Mailing List Subject: Re: [PATCH] libata error handling fixes (ATAPI) Message-ID: <20051116192205.GR7787@suse.de> References: <4379C062.3010302@pobox.com> <20051115120016.GD7787@suse.de> <437A2814.1060308@cs.wisc.edu> <20051115184131.GJ7787@suse.de> <20051116124035.GX7787@suse.de> <58cb370e0511160704w4803a085h7bd6ab352d8c94e6@mail.gmail.com> <20051116153119.GN7787@suse.de> <58cb370e0511160806t1defd373w981e213d1cdeb2b3@mail.gmail.com> <20051116171051.GP7787@suse.de> <58cb370e0511161111u7e99c74ufe0bb9019619d5d0@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <58cb370e0511161111u7e99c74ufe0bb9019619d5d0@mail.gmail.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2390 Lines: 63 On Wed, Nov 16 2005, Bartlomiej Zolnierkiewicz wrote: > On 11/16/05, Jens Axboe wrote: > > On Wed, Nov 16 2005, Bartlomiej Zolnierkiewicz wrote: > > > On 11/16/05, Jens Axboe wrote: > > > > On Wed, Nov 16 2005, Bartlomiej Zolnierkiewicz wrote: > > > > > On 11/16/05, Jens Axboe wrote: > > > > > > > > > > > I updated that patch, and converted IDE and SCSI to use it. See the > > > > > > results here: > > > > > > > > > > > > http://brick.kernel.dk/git/?p=linux-2.6-block.git;a=shortlog;h=blk-softirq > > > > > > > > > > I like it but: > > > > > > > > > > * "we know it's either an FS or PC request" assumption in > > > > > ide_softirq_done() is really wrong > > > > > > > > It used to be correct :-) > > > > > > Sorry but it has been always like that, > > > other requests also pass through ide_end_request() > > > (which of course needs fixing). > > > > You misunderstand, for calls to blk_complete_request() it wasn't true > > initially since it always obyed rq_all_done() (which returns 0 for > > non-fs and non-pc requests). > > from blk_complete_request() [ the only user of rq_all_done() ]: > > + /* > + * for partial completions, fall back to normal end io handling. > + */ > + if (unlikely(!partial_ok && !rq_all_done(req, nbytes))) > + if (end_that_request_chunk(req, uptodate, nbytes)) > + return 1; > > We still will end up with using ide_softirq_done() for !rq_all_done() > case (non FS/PC request) because majority of them (all?) don't use > partial completions. Yes, that's what it looks like now... Note I wrote "wasn't", it used to look like this: if (!rq_all_done(req, nbytes)) { end_that_request_chunk(..); return; } which of course didn't work, so it was changed to the above which then broke the assumption of what type of requests we expect to see in ide_softirq_done(). We can't generically handle this case, so it's probably best to just add this logic to __ide_end_request() - it's just another case for _not_ using the blk_complete_request() path, just like the partial case. -- Jens Axboe - 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/