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=-13.8 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 autolearn=ham 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 35509C433ED for ; Tue, 4 May 2021 17:15:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0CF0B613AA for ; Tue, 4 May 2021 17:15:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231823AbhEDRQu (ORCPT ); Tue, 4 May 2021 13:16:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39106 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231445AbhEDRQt (ORCPT ); Tue, 4 May 2021 13:16:49 -0400 Received: from mail-pg1-x530.google.com (mail-pg1-x530.google.com [IPv6:2607:f8b0:4864:20::530]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BCF41C061761 for ; Tue, 4 May 2021 10:15:54 -0700 (PDT) Received: by mail-pg1-x530.google.com with SMTP id z16so7841237pga.1 for ; Tue, 04 May 2021 10:15:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=osandov-com.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=/Ml/yIk5DGcF758QfcPDaTZzjgkM4u2jzBi6L+5FstI=; b=v8IR5fJT3x2UYJuE1ysgdWNDLq6e6jhdD1dtUfEL0W11yjq6QIDOF3VH3SQ+G/pNlp DlgwWizQbfC7H8Vu/ql4/ASBdHrBvRTcmS8Cu+I5BNvNH2G6yrE5nQsPeRoTArCE5KpG eMh3aSWP0NPj1D9UggorpGfavN/eBTZNofbH+MjsRo0rgeVSKrGffdSj6uDrvxquIZrj R6Rv7u217ckApdqsSlCJvIQ3YqTTaXBju25SCmNAXqEIo8UHxnXjaOPmgjJlS6oWk8z+ mJfg1sqE/4lWty/TIslfcYRnBXapDY5beFTa62+F5ZbEE7B8x964YPWO0qT5gqBZZou3 iE/g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=/Ml/yIk5DGcF758QfcPDaTZzjgkM4u2jzBi6L+5FstI=; b=QnbhvkUKGeil0HFCZlMYjewzLE6pAFjS+fB9IZT2kKeig8cK3sCJrEMC+int7zmgiZ ffpWCZoafLqqbp5vzHJKHTJw08UXTZqwzBNh79Fmrlmw3HAw0suKh1Q+avSSl2gMHWb9 sapuN9dy5bTcnpwlp6GUGJowaUWxZYXojArcsIRJOtzF2oeRRtJiHMNQxMmSUQm1ya/r DJ6RqjPNz8M3D7ek1FMsr05K6HFpqS56zwaIUfRFCFbRia7V3r1cOfOKd4oMz+8i54Vy 0SVS2Bu9zRM6qNw5hYJrehfcmhjKlPad4PgUWzbqWYbPAtrMm/kwFLpKJjL2uSCsfaON 7vGw== X-Gm-Message-State: AOAM532eM+Weh8eV8vQIQ6cuR6o9FjdO0RGuPuQCpbU5yjiNqHdObWS7 XXDNg+iSLrS1+RzG3zLyIx45J4KIrlQKUg== X-Google-Smtp-Source: ABdhPJx3EwiIEmpecTvlKxbVMrVcDSM00tzrNmWTBs+YV6NKqZBH1ZwJcT+tCFB6I7GyhNjYj70SbQ== X-Received: by 2002:a63:ff45:: with SMTP id s5mr15607964pgk.274.1620148553592; Tue, 04 May 2021 10:15:53 -0700 (PDT) Received: from relinquished.localdomain ([2601:602:8b80:8e0::e086]) by smtp.gmail.com with ESMTPSA id v185sm8126135pfb.190.2021.05.04.10.15.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 May 2021 10:15:52 -0700 (PDT) Date: Tue, 4 May 2021 10:15:51 -0700 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: Re: [PATCH RESEND v9 0/9] fs: interface for directly reading/writing compressed data Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Mon, Apr 26, 2021 at 12:06:03PM -0700, Omar Sandoval wrote: > 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-rc8. > > This is a resend of v9 [4], rebased on the latest kdave/misc-next > branch. > > 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.1617258892.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 | 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 Ping.