From patchwork Thu Apr 1 06:51:05 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Omar Sandoval X-Patchwork-Id: 12177313 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 9730BC43461 for ; Thu, 1 Apr 2021 06:52:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 60323610E6 for ; Thu, 1 Apr 2021 06:52:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233299AbhDAGvj (ORCPT ); Thu, 1 Apr 2021 02:51:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59936 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230284AbhDAGv2 (ORCPT ); Thu, 1 Apr 2021 02:51:28 -0400 Received: from mail-pl1-x634.google.com (mail-pl1-x634.google.com [IPv6:2607:f8b0:4864:20::634]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8C77FC06178A for ; Wed, 31 Mar 2021 23:51:28 -0700 (PDT) Received: by mail-pl1-x634.google.com with SMTP id y2so533179plg.5 for ; Wed, 31 Mar 2021 23:51:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=osandov-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=Q+eBXF4UpkxH1troRhu2jm8vxXsGdka+ag1Br0jPZ30=; b=YUD8aiySztkmmHvnvo4DGQ3AGaz6HDxe533EzJg8zG0ft0tStlCRsU9kCc+KZAeOoq m5BFVHlo/+2PuARox8aePR6lLZe3My74BvjhbPIodJkasltyDnM1TlwWsZYFn0aOyHKU dfGYastzuOW/2stRMFA0ZciZ8IwLpF29JkoUVUOa+fEDzgTb51MeW07qYUrtVI2+x3Sj FM18E+o0CbI3HzeEfSA0vVVxDEG95+/70lil0jD/t5vw7yd0tD6kTZgjLeEixYEGADvE OsyzfhC0F/soYGhpIvTkN5RhvF7z2IvgXjGaWSCyXZzI2+I2T2DFDiwT7cMZlvSN6Ohu SDoA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=Q+eBXF4UpkxH1troRhu2jm8vxXsGdka+ag1Br0jPZ30=; b=QcF9GFLeyYAPDoKAhmDQYENvWNmYrfpIo2heyYcPaY1clMzxN/XYatRgOjfqhm37PI ggMBJyE8gbY7wXSlEgGASOFl+Mc8Ol/5zPSlFbw9V1NcTTmBiaz1IhwVvumGPJJcFRwU 5a6BLHtXOl/IK4U5kuWFdWiLbSSj+N8guXt3M5s4KVa3dF0hDV0G5TLd9ktiCB+5T9ZG z5DXwYuUzw9M4Abb0bC1WSabCHKzgnjjjp90p1mHhNGANoZbhygXLQKZnnT8eV2zpPtn LkuFuLbx9UezFhQQAnuVLBwWKX54DHxiHc6gwEE57/OSTrIFJ9k/je49ZTwS3xg6AOGr JL6Q== X-Gm-Message-State: AOAM533MSNkjart9UE78P2yKDwm3BKgKeO1MzYhbEUboqz7q5VYP6f5n PFkGjgkJUof1K6wq/o45tVgJWmZJZ+oShA== X-Google-Smtp-Source: ABdhPJx0q+5a6ISbEcH6bs0ZPTCRqx81j3htCq0THXemy4Hk6tnDlPF/UUcfkomaH26E3FTvjePd2Q== X-Received: by 2002:a17:90a:a103:: with SMTP id s3mr7537031pjp.158.1617259887450; Wed, 31 Mar 2021 23:51:27 -0700 (PDT) Received: from relinquished.tfbnw.net ([2620:10d:c090:400::5:3734]) by smtp.gmail.com with ESMTPSA id kk6sm4158345pjb.51.2021.03.31.23.51.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 31 Mar 2021 23:51:26 -0700 (PDT) From: Omar Sandoval To: linux-fsdevel@vger.kernel.org, linux-btrfs@vger.kernel.org, Al Viro , Christoph Hellwig Cc: Linus Torvalds , Dave Chinner , Jann Horn , Amir Goldstein , Aleksa Sarai , linux-api@vger.kernel.org, kernel-team@fb.com Subject: [PATCH v9 0/9] fs: interface for directly reading/writing compressed data Date: Wed, 31 Mar 2021 23:51:05 -0700 Message-Id: X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Omar Sandoval This series adds an API for reading compressed data on a filesystem without decompressing it as well as support for writing compressed data directly to the filesystem. I have test cases (including fsstress support) and example programs which I'll send up once the dust settles [1]. The main use-case is Btrfs send/receive: currently, when sending data from one compressed filesystem to another, the sending side decompresses the data and the receiving side recompresses it before writing it out. This is wasteful and can be avoided if we can just send and write compressed extents. The patches implementing the send/receive support were sent with the last submission of this series [2]. Patches 1-3 add the VFS support, UAPI, and documentation. Patches 4-7 are Btrfs prep patches. Patch 8 adds Btrfs encoded read support and patch 9 adds Btrfs encoded write support. These patches are based on Dave Sterba's Btrfs misc-next branch [3], which is in turn currently based on v5.12-rc5. Changes since v8 [4]: - Simplified copy_struct_from_iter() to only handle one segment rather than iterating. - Added UAPI documentation as rst adapted from the man page I previously sent. - Fixed definition of O_ALLOW_ENCODED for parisc. - Dropped "btrfs: fix check_data_csum() error message for direct I/O", which has been merged into kdave/misc-next. Omar Sandoval (9): iov_iter: add copy_struct_from_iter() fs: add O_ALLOW_ENCODED open flag fs: add RWF_ENCODED for reading/writing compressed data btrfs: don't advance offset for compressed bios in btrfs_csum_one_bio() btrfs: add ram_bytes and offset to btrfs_ordered_extent btrfs: support different disk extent size for delalloc btrfs: optionally extend i_size in cow_file_range_inline() btrfs: implement RWF_ENCODED reads btrfs: implement RWF_ENCODED writes 1: https://github.com/osandov/xfstests/tree/rwf-encoded 2: https://lore.kernel.org/linux-btrfs/cover.1615922753.git.osandov@fb.com/ 3: https://github.com/kdave/btrfs-devel/tree/misc-next 4: https://lore.kernel.org/linux-btrfs/cover.1615922644.git.osandov@fb.com/ Documentation/filesystems/encoded_io.rst | 240 ++++++ Documentation/filesystems/index.rst | 1 + arch/alpha/include/uapi/asm/fcntl.h | 1 + arch/parisc/include/uapi/asm/fcntl.h | 1 + arch/sparc/include/uapi/asm/fcntl.h | 1 + fs/btrfs/compression.c | 12 +- fs/btrfs/compression.h | 6 +- fs/btrfs/ctree.h | 9 +- fs/btrfs/delalloc-space.c | 18 +- fs/btrfs/file-item.c | 35 +- fs/btrfs/file.c | 46 +- fs/btrfs/inode.c | 929 +++++++++++++++++++++-- fs/btrfs/ordered-data.c | 124 +-- fs/btrfs/ordered-data.h | 25 +- fs/btrfs/relocation.c | 4 +- fs/fcntl.c | 10 +- fs/namei.c | 4 + fs/read_write.c | 168 +++- include/linux/encoded_io.h | 17 + include/linux/fcntl.h | 2 +- include/linux/fs.h | 13 + include/linux/uio.h | 1 + include/uapi/asm-generic/fcntl.h | 4 + include/uapi/linux/encoded_io.h | 30 + include/uapi/linux/fs.h | 5 +- lib/iov_iter.c | 91 +++ 26 files changed, 1563 insertions(+), 234 deletions(-) create mode 100644 Documentation/filesystems/encoded_io.rst create mode 100644 include/linux/encoded_io.h create mode 100644 include/uapi/linux/encoded_io.h