From patchwork Sun Feb 7 17:09:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ruan Shiyang X-Patchwork-Id: 12073197 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 BB46FC433DB for ; Sun, 7 Feb 2021 17:11:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8ECCB64DB1 for ; Sun, 7 Feb 2021 17:11:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229729AbhBGRKh (ORCPT ); Sun, 7 Feb 2021 12:10:37 -0500 Received: from mail.cn.fujitsu.com ([183.91.158.132]:49745 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S229706AbhBGRKc (ORCPT ); Sun, 7 Feb 2021 12:10:32 -0500 X-IronPort-AV: E=Sophos;i="5.81,160,1610380800"; d="scan'208";a="104299367" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 08 Feb 2021 01:09:32 +0800 Received: from G08CNEXMBPEKD04.g08.fujitsu.local (unknown [10.167.33.201]) by cn.fujitsu.com (Postfix) with ESMTP id DEF7F4CE6F6E; Mon, 8 Feb 2021 01:09:27 +0800 (CST) Received: from G08CNEXCHPEKD04.g08.fujitsu.local (10.167.33.200) by G08CNEXMBPEKD04.g08.fujitsu.local (10.167.33.201) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 8 Feb 2021 01:09:30 +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; Mon, 8 Feb 2021 01:09:29 +0800 From: Shiyang Ruan To: , , , CC: , , , , , , , , , Subject: [PATCH 0/7] fsdax,xfs: Add reflink&dedupe support for fsdax Date: Mon, 8 Feb 2021 01:09:17 +0800 Message-ID: <20210207170924.2933035-1-ruansy.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.30.0 MIME-Version: 1.0 X-yoursite-MailScanner-ID: DEF7F4CE6F6E.A03B3 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@cn.fujitsu.com Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org This patchset is attempt to add CoW support for fsdax, and take XFS, which has both reflink and fsdax feature, as an example. 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 v5.10) == Shiyang Ruan (7): fsdax: Output address in dax_iomap_pfn() and rename it fsdax: Introduce dax_copy_edges() for CoW fsdax: Copy data before write fsdax: Replace mmap entry in case of CoW 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/btrfs/reflink.c | 3 +- fs/dax.c | 188 ++++++++++++++++++++++++++++++++++++++--- fs/ocfs2/file.c | 2 +- fs/remap_range.c | 14 +-- fs/xfs/xfs_bmap_util.c | 6 +- fs/xfs/xfs_file.c | 30 ++++++- fs/xfs/xfs_inode.c | 8 +- fs/xfs/xfs_inode.h | 1 + fs/xfs/xfs_iomap.c | 3 +- fs/xfs/xfs_iops.c | 11 ++- fs/xfs/xfs_reflink.c | 23 ++++- include/linux/dax.h | 5 ++ include/linux/fs.h | 9 +- 13 files changed, 270 insertions(+), 33 deletions(-)