From patchwork Fri Feb 28 23:13:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Omar Sandoval X-Patchwork-Id: 11413403 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E221A14B4 for ; Fri, 28 Feb 2020 23:14:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B8BD92469C for ; Fri, 28 Feb 2020 23:14:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=osandov-com.20150623.gappssmtp.com header.i=@osandov-com.20150623.gappssmtp.com header.b="ZVpx4u+b" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726527AbgB1XOM (ORCPT ); Fri, 28 Feb 2020 18:14:12 -0500 Received: from mail-pj1-f65.google.com ([209.85.216.65]:36067 "EHLO mail-pj1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726046AbgB1XOM (ORCPT ); Fri, 28 Feb 2020 18:14:12 -0500 Received: by mail-pj1-f65.google.com with SMTP id gv17so1896685pjb.1 for ; Fri, 28 Feb 2020 15:14:10 -0800 (PST) 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=qYRCFe+0MRQNS4OgeJSALRbvhoDISvltVMM/A8keomE=; b=ZVpx4u+bpNYlQ8XxZ+f5VbCuEBlDevQRfeh/RZjzaQwKmjHUSK4YhdjsexT3HOwCQr J/IEdHl33g1zaJelduV2oMPjTZ0FCQhNps8zU4K7DUyE4MXDFPbPHelmCdY5OkB6U+ww R0vCPzPB+FWSBIKtc+vZgUmX+xHhWvxIcNj62oFdg9rHcWm5mYYkBW2OHpBqkhfh+dG9 GI32ASERUQrIM8CnMpvJ+hysNcYv+DsydD3y/HvUCoj037OaLGgJ3cJG7I6EW5H3EG4N b8z3wV5BWGptgho1DbdR5C/p0d5qoUb56TA5jcN3fidIwB4j4r4PnOZmO5Fw850aOIfF V1Kw== 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=qYRCFe+0MRQNS4OgeJSALRbvhoDISvltVMM/A8keomE=; b=A0YDuVabE8MuWcH02K0+KDi/+w3S+GnQV/CHkDk8EVIIfHWHH4qBoiGJmk7iJEVap6 aqjBBFLDl3oUcSnlTvFdaW51z0yCx1UevdnVZk+VcQHXQl4xG+Zcd4/t692vpJfG4Lv0 A8INtCUNngvg2AI45Kaw1E2elwaiCvHAAo9X83BXBZFeIRozWgkHhYUDLJLJc935b/b4 FQWIm2SnMs/4mprsZJAb9IrAhqFIP3VynS6ak0kJE7V8IJCV5nKYXfbFF6p63qJGrnf0 s1bmdxtmwPQbZAE/ZrwxUCVCKbFlqYk4mbSvLGI6W+ej1Q3s+XlM8NHeqN1Bv/JSj9YY 6yow== X-Gm-Message-State: APjAAAUpHdwWqtZOO2TOjnSCnTBMTiA309KjMBV244v51faRtLFfYIeP hYIsC86wLdWGI2wMuN5d2opvvw== X-Google-Smtp-Source: APXvYqx0CySVh5fXc2TgOxWs832q5LpZeX0rkAWsq8FVK+WvnC1Q6Lj3ciwIS0BP//UODtlU0SLMtQ== X-Received: by 2002:a17:902:a608:: with SMTP id u8mr6010424plq.76.1582931649409; Fri, 28 Feb 2020 15:14:09 -0800 (PST) Received: from vader.thefacebook.com ([2620:10d:c090:500::6:1714]) by smtp.gmail.com with ESMTPSA id q7sm11421878pgk.62.2020.02.28.15.14.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Feb 2020 15:14:08 -0800 (PST) From: Omar Sandoval To: linux-fsdevel@vger.kernel.org, linux-btrfs@vger.kernel.org, Al Viro , Christoph Hellwig Cc: Dave Chinner , Jann Horn , Amir Goldstein , Aleksa Sarai , linux-api@vger.kernel.org, kernel-team@fb.com Subject: [PATCH v4 0/9] fs: interface for directly reading/writing compressed data Date: Fri, 28 Feb 2020 15:13:51 -0800 Message-Id: X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org From: Omar Sandoval Hello, 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. As with the previous submissions, I've included a man page patch describing the API. I have test cases (including fsstress support) and example programs which I'll send up once the interface is more or less settled [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 send part will be implemented in a separate series, as this API can stand alone. I'm fairly happy with the UAPI and VFS interface now. I'd love for Al and/or Christoph to take a look at that part. The Btrfs side is mostly there, just missing read repair. Patches 1-3 add the VFS support. Patches 4-7 are Btrfs prep patches. Patch 8 adds Btrfs encoded read support and patch 9 adds Btrfs encoded write support. Changes from v3: - Rebase on v5.6-rc3. - Disallow extents with a file length greater than the unencoded length. - Drop Btrfs cleanups and fixes that have already been merged. - Add Nikolay's reviewed-bys. Please share any comments on the API or implementation. Thanks! 1: https://github.com/osandov/xfstests/tree/rwf-encoded 2: https://lore.kernel.org/linux-btrfs/cover.1574273658.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 | 74 ++ 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 | 38 +- fs/btrfs/delalloc-space.h | 4 +- fs/btrfs/file-item.c | 35 +- fs/btrfs/file.c | 55 +- fs/btrfs/inode.c | 873 ++++++++++++++++++++--- fs/btrfs/ordered-data.c | 77 +- fs/btrfs/ordered-data.h | 18 +- fs/btrfs/relocation.c | 4 +- fs/fcntl.c | 10 +- fs/namei.c | 4 + include/linux/fcntl.h | 2 +- include/linux/fs.h | 16 + include/linux/uio.h | 2 + include/uapi/asm-generic/fcntl.h | 4 + include/uapi/linux/fs.h | 33 +- lib/iov_iter.c | 82 +++ mm/filemap.c | 166 ++++- 25 files changed, 1306 insertions(+), 222 deletions(-) create mode 100644 Documentation/filesystems/encoded_io.rst