From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 44EC0C43441 for ; Thu, 22 Nov 2018 01:09:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 137DD206BA for ; Thu, 22 Nov 2018 01:09:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 137DD206BA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391295AbeKVLqg (ORCPT ); Thu, 22 Nov 2018 06:46:36 -0500 Received: from mx1.redhat.com ([209.132.183.28]:53436 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732372AbeKVLqg (ORCPT ); Thu, 22 Nov 2018 06:46:36 -0500 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id CBB017F3EC; Thu, 22 Nov 2018 01:09:42 +0000 (UTC) Received: from ming.t460p (ovpn-8-27.pek2.redhat.com [10.72.8.27]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C2BCE5D738; Thu, 22 Nov 2018 01:09:17 +0000 (UTC) Date: Thu, 22 Nov 2018 09:09:13 +0800 From: Ming Lei To: Christoph Hellwig Cc: Jens Axboe , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Theodore Ts'o , Omar Sandoval , Sagi Grimberg , Dave Chinner , Kent Overstreet , Mike Snitzer , dm-devel@redhat.com, Alexander Viro , linux-fsdevel@vger.kernel.org, Shaohua Li , linux-raid@vger.kernel.org, David Sterba , linux-btrfs@vger.kernel.org, "Darrick J . Wong" , linux-xfs@vger.kernel.org, Gao Xiang , linux-ext4@vger.kernel.org, Coly Li , linux-bcache@vger.kernel.org, Boaz Harrosh , Bob Peterson , cluster-devel@redhat.com Subject: Re: [PATCH V11 02/19] block: introduce multi-page bvec helpers Message-ID: <20181122010912.GB20814@ming.t460p> References: <20181121032327.8434-1-ming.lei@redhat.com> <20181121032327.8434-3-ming.lei@redhat.com> <20181121131928.GA1640@lst.de> <20181121150610.GA19111@ming.t460p> <20181121160811.GA4977@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181121160811.GA4977@lst.de> User-Agent: Mutt/1.9.1 (2017-09-22) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Thu, 22 Nov 2018 01:09:43 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Nov 21, 2018 at 05:08:11PM +0100, Christoph Hellwig wrote: > On Wed, Nov 21, 2018 at 11:06:11PM +0800, Ming Lei wrote: > > bvec_iter_* is used for single-page bvec in current linus tree, and there are > > lots of users now: > > > > [linux]$ git grep -n "bvec_iter_*" ./ | wc > > 191 995 13242 > > > > If we have to switch it first, it can be a big change, just wondering if Jens > > is happy with that? > > Your above grep statement seems to catch every use of struct bvec_iter, > due to the *. > > Most uses of bvec_iter_ are either in the block headers, or are > ceph wrappers that match the above and can easily be redefined. OK, looks you are right, seems not so widely used: $ git grep -n -w -E "bvec_iter_len|bvec_iter_bvec|bvec_iter_advance|bvec_iter_page|bvec_iter_offset" ./ | wc 36 194 2907 I will switch to that given the effected driver are only dm, nvdimm and ceph. Thanks, Ming