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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no 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 0DE5AC433E6 for ; Wed, 10 Feb 2021 13:20:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D1B3364E7D for ; Wed, 10 Feb 2021 13:20:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229731AbhBJNUW (ORCPT ); Wed, 10 Feb 2021 08:20:22 -0500 Received: from verein.lst.de ([213.95.11.211]:51090 "EHLO verein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231583AbhBJNUN (ORCPT ); Wed, 10 Feb 2021 08:20:13 -0500 Received: by verein.lst.de (Postfix, from userid 2407) id E84686736F; Wed, 10 Feb 2021 14:19:28 +0100 (CET) Date: Wed, 10 Feb 2021 14:19:28 +0100 From: Christoph Hellwig To: Ruan Shiyang Cc: Christoph Hellwig , linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org, darrick.wong@oracle.com, dan.j.williams@intel.com, willy@infradead.org, jack@suse.cz, viro@zeniv.linux.org.uk, linux-btrfs@vger.kernel.org, ocfs2-devel@oss.oracle.com, david@fromorbit.com, rgoldwyn@suse.de, Goldwyn Rodrigues Subject: Re: [PATCH 5/7] fsdax: Dedup file range to use a compare function Message-ID: <20210210131928.GA30109@lst.de> References: <20210207170924.2933035-1-ruansy.fnst@cn.fujitsu.com> <20210207170924.2933035-6-ruansy.fnst@cn.fujitsu.com> <20210208151920.GE12872@lst.de> <9193e305-22a1-3928-0675-af1cecd28942@cn.fujitsu.com> <20210209093438.GA630@lst.de> <79b0d65c-95dd-4821-e412-ab27c8cb6942@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <79b0d65c-95dd-4821-e412-ab27c8cb6942@cn.fujitsu.com> User-Agent: Mutt/1.5.17 (2007-11-01) Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Tue, Feb 09, 2021 at 05:46:13PM +0800, Ruan Shiyang wrote: > > > On 2021/2/9 下午5:34, Christoph Hellwig wrote: >> On Tue, Feb 09, 2021 at 05:15:13PM +0800, Ruan Shiyang wrote: >>> The dax dedupe comparison need the iomap_ops pointer as argument, so my >>> understanding is that we don't modify the argument list of >>> generic_remap_file_range_prep(), but move its code into >>> __generic_remap_file_range_prep() whose argument list can be modified to >>> accepts the iomap_ops pointer. Then it looks like this: >> >> I'd say just add the iomap_ops pointer to >> generic_remap_file_range_prep and do away with the extra wrappers. We >> only have three callers anyway. > > OK. So looking at this again I think your proposal actaully is better, given that the iomap variant is still DAX specific. Sorry for the noise. Also I think dax_file_range_compare should use iomap_apply instead of open coding it.