From patchwork Fri Mar 19 01:52:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12149655 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=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT 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 5386CC433E6 for ; Fri, 19 Mar 2021 01:53:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1DEF764EB9 for ; Fri, 19 Mar 2021 01:53:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229680AbhCSBw4 (ORCPT ); Thu, 18 Mar 2021 21:52:56 -0400 Received: from mail.cn.fujitsu.com ([183.91.158.132]:41437 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S230389AbhCSBws (ORCPT ); Thu, 18 Mar 2021 21:52:48 -0400 IronPort-HdrOrdr: A9a23:ARB8MK8Ih9lumEGjpUVuk+A4I+orLtY04lQ7vn1ZYxpTb8CeioSSjO0WvCWE7Ao5dVMBvZS7OKeGSW7B7pId2+QsFJqrQQWOggWVBa5v4YboyzfjXw3Sn9Q26Y5OaK57YeeQMXFfreLXpDa1CMwhxt7vytHMuc77w212RQ9nL4FMhj0JaTqzKUF9SAlYCZdRLvP1ifZvnSaqengcc62Adxs4dtXEzueqqLvWJTYCBzMCrDKFlC6U7tfBeCSw71MzVCxuzN4ZnVT4rw== X-IronPort-AV: E=Sophos;i="5.81,259,1610380800"; d="scan'208";a="105876646" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 19 Mar 2021 09:52:46 +0800 Received: from G08CNEXMBPEKD05.g08.fujitsu.local (unknown [10.167.33.204]) by cn.fujitsu.com (Postfix) with ESMTP id 122074CEB2A3; Fri, 19 Mar 2021 09:52:46 +0800 (CST) Received: from G08CNEXJMPEKD02.g08.fujitsu.local (10.167.33.202) by G08CNEXMBPEKD05.g08.fujitsu.local (10.167.33.204) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 19 Mar 2021 09:52:46 +0800 Received: from G08CNEXCHPEKD04.g08.fujitsu.local (10.167.33.200) by G08CNEXJMPEKD02.g08.fujitsu.local (10.167.33.202) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 19 Mar 2021 09:52:42 +0800 Received: from irides.mr.mr.mr (10.167.225.141) by G08CNEXCHPEKD04.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Fri, 19 Mar 2021 09:52:41 +0800 From: Shiyang Ruan To: , , , CC: , , , , , , , , , , Shiyang Ruan Subject: [PATCH v3 00/10] fsdax,xfs: Add reflink&dedupe support for fsdax Date: Fri, 19 Mar 2021 09:52:27 +0800 Message-ID: <20210319015237.993880-1-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.30.1 MIME-Version: 1.0 X-yoursite-MailScanner-ID: 122074CEB2A3.A4D15 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Shiyang Ruan This patchset is attempt to add CoW support for fsdax, and take XFS, which has both reflink and fsdax feature, as an example. Changes from V2: - Fix the mistake in iomap_apply2() and dax_dedupe_file_range_compare() - Add CoW judgement in dax_iomap_zero() - Fix other code style problems and mistakes Changes from V1: - Factor some helper functions to simplify dax fault code - Introduce iomap_apply2() for dax_dedupe_file_range_compare() - Fix mistakes and other problems - Rebased on v5.11 One of the key mechanism need to be implemented in fsdax is CoW. Copy the data from srcmap before we actually write data to the destance iomap. And we just copy range in which data won't be changed. Another mechanism is range comparison. In page cache case, readpage() is used to load data on disk to page cache in order to be able to compare data. In fsdax case, readpage() does not work. So, we need another compare data with direct access support. With the two mechanism implemented in fsdax, we are able to make reflink and fsdax work together in XFS. Some of the patches are picked up from Goldwyn's patchset. I made some changes to adapt to this patchset. (Rebased on v5.11) == Shiyang Ruan (10): fsdax: Factor helpers to simplify dax fault code fsdax: Factor helper: dax_fault_actor() fsdax: Output address in dax_iomap_pfn() and rename it fsdax: Introduce dax_iomap_cow_copy() fsdax: Replace mmap entry in case of CoW fsdax: Add dax_iomap_cow_copy() for dax_iomap_zero iomap: Introduce iomap_apply2() for operations on two files fsdax: Dedup file range to use a compare function fs/xfs: Handle CoW for fsdax write() path fs/xfs: Add dedupe support for fsdax fs/dax.c | 596 ++++++++++++++++++++++++++--------------- fs/iomap/apply.c | 56 ++++ fs/iomap/buffered-io.c | 2 +- fs/remap_range.c | 45 +++- fs/xfs/xfs_bmap_util.c | 3 +- fs/xfs/xfs_file.c | 29 +- fs/xfs/xfs_inode.c | 8 +- fs/xfs/xfs_inode.h | 1 + fs/xfs/xfs_iomap.c | 58 +++- fs/xfs/xfs_iomap.h | 4 + fs/xfs/xfs_iops.c | 7 +- fs/xfs/xfs_reflink.c | 17 +- include/linux/dax.h | 7 +- include/linux/fs.h | 15 +- include/linux/iomap.h | 7 +- 15 files changed, 602 insertions(+), 253 deletions(-) --- 2.30.1