From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754386AbdDEGkC (ORCPT ); Wed, 5 Apr 2017 02:40:02 -0400 Received: from mx2.suse.de ([195.135.220.15]:44471 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753746AbdDEGkB (ORCPT ); Wed, 5 Apr 2017 02:40:01 -0400 Subject: Re: [PATCH 8/9] bio: add bvec_iter rewind API To: Dmitry Monakhov , linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, martin.petersen@oracle.com References: <1491332201-26926-1-git-send-email-dmonakhov@openvz.org> <1491332201-26926-9-git-send-email-dmonakhov@openvz.org> From: Hannes Reinecke Message-ID: <40f06650-15bd-a4d0-57d2-f3fba12271c1@suse.de> Date: Wed, 5 Apr 2017 08:39:59 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <1491332201-26926-9-git-send-email-dmonakhov@openvz.org> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/04/2017 08:56 PM, Dmitry Monakhov wrote: > Some ->bi_end_io handlers (for example: pi_verify or decrypt handlers) > need to know original data vector, but after bio traverse io-stack it may > be advanced, splited and relocated many times so it is hard to guess > original iterator. Let's add 'bi_done' conter which accounts number > of bytes iterator was advanced during it's evolution. Later end_io handler > may easily restore original iterator by rewinding iterator to > iter->bi_done. > > Note: this change makes sizeof (struct bvec_iter) multiple to 8 > Signed-off-by: Dmitry Monakhov > --- > include/linux/bio.h | 21 +++++++++++++++++++-- > include/linux/bvec.h | 26 ++++++++++++++++++++++++++ > 2 files changed, 45 insertions(+), 2 deletions(-) > Reviewed-by: Hannes Reinecke Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking hare@suse.de +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG Nürnberg)