From patchwork Sun Jul 4 13:50:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gao Xiang X-Patchwork-Id: 12357465 Received: from out4436.biz.mail.alibaba.com (out4436.biz.mail.alibaba.com [47.88.44.36]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 053C670 for ; Sun, 4 Jul 2021 13:56:42 +0000 (UTC) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R891e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04395;MF=hsiangkao@linux.alibaba.com;NM=1;PH=DS;RN=9;SR=0;TI=SMTPD_---0UeeMavo_1625406659; Received: from e18g09479.et15sqa.tbsite.net(mailfrom:hsiangkao@linux.alibaba.com fp:SMTPD_---0UeeMavo_1625406659) by smtp.aliyun-inc.com(127.0.0.1); Sun, 04 Jul 2021 21:51:05 +0800 From: Gao Xiang To: linux-erofs@lists.ozlabs.org Cc: linux-fsdevel@vger.kernel.org, LKML , nvdimm@lists.linux.dev, "Darrick J. Wong" , Liu Bo , Joseph Qi , Liu Jiang , Gao Xiang Subject: [RFC PATCH 0/2] erofs: dio/dax support for non-tailpacking cases Date: Sun, 4 Jul 2021 21:50:54 +0800 Message-Id: <20210704135056.42723-1-hsiangkao@linux.alibaba.com> X-Mailer: git-send-email 2.24.4 Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 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 | 143 +++++++++++++++++++++++++++++++++++++++++++- fs/erofs/inode.c | 10 +++- fs/erofs/internal.h | 3 + fs/erofs/super.c | 20 ++++++- 5 files changed, 173 insertions(+), 4 deletions(-)