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=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,UNPARSEABLE_RELAY,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 01CD0C07E99 for ; Mon, 12 Jul 2021 12:03:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DC57861004 for ; Mon, 12 Jul 2021 12:03:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233456AbhGLMFl (ORCPT ); Mon, 12 Jul 2021 08:05:41 -0400 Received: from out30-42.freemail.mail.aliyun.com ([115.124.30.42]:50264 "EHLO out30-42.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232718AbhGLMFi (ORCPT ); Mon, 12 Jul 2021 08:05:38 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R181e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04394;MF=hsiangkao@linux.alibaba.com;NM=1;PH=DS;RN=10;SR=0;TI=SMTPD_---0UfXFBmR_1626091362; Received: from e18g09479.et15sqa.tbsite.net(mailfrom:hsiangkao@linux.alibaba.com fp:SMTPD_---0UfXFBmR_1626091362) by smtp.aliyun-inc.com(127.0.0.1); Mon, 12 Jul 2021 20:02:48 +0800 From: Gao Xiang To: linux-erofs@lists.ozlabs.org Cc: linux-fsdevel@vger.kernel.org, nvdimm@lists.linux.dev, LKML , "Darrick J. Wong" , Chao Yu , Liu Bo , Joseph Qi , Liu Jiang , Gao Xiang Subject: [PATCH v2 0/2] erofs: dio/dax support for non-tailpacking cases Date: Mon, 12 Jul 2021 20:02:39 +0800 Message-Id: <20210712120241.199903-1-hsiangkao@linux.alibaba.com> X-Mailer: git-send-email 2.24.4 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi folks, This patchset mainly adds preliminary EROFS iomap dio/dax support for non-tailpacking uncompressed cases. Direct I/O is useful in certain scenarios for uncompressed files. For example, double pagecache can be avoid by direct I/O when loop device is used for uncompressed files containing upper layer compressed filesystem. Also, DAX is quite useful for some VM use cases in order to save guest memory extremely by using the minimal lightweight EROFS. Tail-packing inline iomap support will be handled later since currently iomap doesn't support such data pattern, which is independent to non-tailpacking cases. Comments are welcome. Thanks for your time on reading this! Thanks, Gao Xiang changes since v1: - allow 'dax=always' and 'dax=never' to keep in sync with ext4/xfs Gao Xiang (1): erofs: dax support for non-tailpacking regular file Huang Jianan (1): erofs: iomap support for non-tailpacking DIO fs/erofs/Kconfig | 1 + fs/erofs/data.c | 142 +++++++++++++++++++++++++++++++++++++++++++- fs/erofs/inode.c | 9 ++- fs/erofs/internal.h | 4 ++ fs/erofs/super.c | 60 ++++++++++++++++++- 5 files changed, 212 insertions(+), 4 deletions(-) -- 2.24.4