From patchwork Thu Jun 17 23:51:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Omar Sandoval X-Patchwork-Id: 12329831 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,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 B428BC49EA2 for ; Thu, 17 Jun 2021 23:51:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 88B89600D1 for ; Thu, 17 Jun 2021 23:51:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231883AbhFQXx6 (ORCPT ); Thu, 17 Jun 2021 19:53:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48160 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231497AbhFQXx5 (ORCPT ); Thu, 17 Jun 2021 19:53:57 -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 54300C061760 for ; Thu, 17 Jun 2021 16:51:48 -0700 (PDT) Received: by mail-pl1-x634.google.com with SMTP id o21so3758169pll.6 for ; Thu, 17 Jun 2021 16:51:48 -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=kLtan7ZgJ39lAhTwAEL8BRZtTwp/aIezL/TyKBUefV8=; b=CMbZvSZFdRziY2qn+EzuEJyFpb5KZc/g7cglf106+oa8PYPkBH90Vjzm8GS/NgOeJ+ yxc+cnRixg44tkVtPCwP7Nj1QHoAx2PgTqvkZl83ye7hBhxdXyjRzcXQN+i9arLDTVlZ u5ZcQbdYqYB2r0tmcEo4NfOxV1zLYTz6NKqZRkeiG4b+Mgm6ORrx2FXBsUT32s5iW5Li 3/K1IZmDw76onWKA2uUKE6pX3ig2sp5K7/A8sN9aGSBSWSvLF7m8EDg0Idgy35bNHxnb SpczVRDx7uvMVuM1Dps9nCh3R6B0UsfPp/PiNdu0OpTvIRgLanXcpOJk+tR1Gf5SHFyj hosQ== 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=kLtan7ZgJ39lAhTwAEL8BRZtTwp/aIezL/TyKBUefV8=; b=RxSdTYtJHPvaeyVd47y909hupro6Be+PueITkIOIxhKjZz5p15RV/TmKHifUg2S30o pFKkonXfD/eCtJlsxe0bSb8v82vXT91CrehqIxPrG4A7EVa76fyojvNddweTD1FYrxJi xqi4sKL5pGylQ/Mo1KLhQYp7hASKr4P4xd0hPQPqQ+upqp3s1YSkhyChMK8Ez1/qNZYe YdaWr5bq0qTz8nDc5vD7f/1iGtLqD9SWcmS16dMpff3ek1lrOwainyKlK0d9YoCMsqQs BcwRr2DWu5ebl2leVzT8/mf9K5ogtuozbCFN/sf74HzoUJEHFb4BNtdS0vw/Fkb56t0D VCrA== X-Gm-Message-State: AOAM530dTPJX6UVERoFinpOXCpKResUFrTEe8ZFlSFtRd8ZGjWCCRLBv 4SnnMZJRQLbhqMYtCYf32YwBuVYjAhHpTQ== X-Google-Smtp-Source: ABdhPJyA6tXbsmmkly8bTrUXZH/0/TjlUm3khtAowkRsCAeYUZKTslgJojSVEnGBaGDHmX3h6GCLlA== X-Received: by 2002:a17:90a:8502:: with SMTP id l2mr7943043pjn.215.1623973907360; Thu, 17 Jun 2021 16:51:47 -0700 (PDT) Received: from relinquished.tfbnw.net ([2620:10d:c090:400::5:2f0e]) by smtp.gmail.com with ESMTPSA id a187sm6087517pfb.66.2021.06.17.16.51.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Jun 2021 16:51:46 -0700 (PDT) From: Omar Sandoval To: linux-fsdevel@vger.kernel.org, linux-btrfs@vger.kernel.org, Al Viro Cc: Linus Torvalds , linux-api@vger.kernel.org, kernel-team@fb.com Subject: [PATCH RESEND x3 v9 0/9] fs: interface for directly reading/writing compressed data Date: Thu, 17 Jun 2021 16:51:23 -0700 Message-Id: X-Mailer: git-send-email 2.32.0 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 v5.13-rc6. This is a _resend of a resend of a resend_ of v9 [4], rebased on the latest kdave/misc-next branch. In the last resend, there was some good discussion around how to support encryption with this interface in the future. The conclusion was that this interface should suffice for file data, and we would need separate interface(s) for working with encrypted file names. So, this really just needs review on the VFS side. 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-fsdevel/cover.1621276134.git.osandov@fb.com/ 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 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 | 925 +++++++++++++++++++++-- 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, 1559 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