From patchwork Wed Jan 8 08:36:47 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 11323063 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 B365613A0 for ; Wed, 8 Jan 2020 08:36:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 86675206DA for ; Wed, 8 Jan 2020 08:36:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=wdc.com header.i=@wdc.com header.b="gpkqejkd" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727156AbgAHIgw (ORCPT ); Wed, 8 Jan 2020 03:36:52 -0500 Received: from esa5.hgst.iphmx.com ([216.71.153.144]:42733 "EHLO esa5.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726313AbgAHIgv (ORCPT ); Wed, 8 Jan 2020 03:36:51 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1578472612; x=1610008612; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=RZw4fJRDKODBrpS77sy6ig8sTH7XmTRBFGi4XjXTMsk=; b=gpkqejkdT3XXAWvO6kT682FWVPUtWd7y2YTEn8fGA0/geRPEd9GVsKu2 pg4rI+Jo2t8SUWhnCWcRMmpGZeQ5eL+O8vsbi7oRkaTEJgLV0uibKfU+f qgFrHpTxtGGHGfpk6C2xwiPpqHtwJdEXKyS+po9Ck4nOrehLRB6849ZfB 1j5GvmmryoL7uPYAi08BxpQjeS3rWYrxjWc59fku24MOG3QWBhUuedq8O 2JnRDJT0RqZJBFttNrTw8apMKPv07+z9G0fMxnxLOybq8s7uv41+Y80Tw hje4x+adXMmT4fDFdDTYRELUVtnReK9bIAEYHEvtFBuGp94OojrVMRpm5 Q==; IronPort-SDR: e+zhfgWskNTyYkcTJgtC2m/mz3an8VoyJEnvQnXIueGBYX0eMkxIfzgelvoUCqo3yA4Q4lOSDH zPvvCLGs83g3rCHmISfakNKphdkN7KTlvlb06mi2GbU6lIeGjtv4yQqD+75pg0ghWNqpspeFQR vL15RTnduX2GD6Z1lYvdBXxo/7/sepO0dobn3JfIvJDXIo7ZDkXMczB5PDazSPy9cgN3rzy2Vw Vde2l79x0yhAJui6Qt27316eYXcQvSk3lEZ2WJ7IcNtYNyycqPBbdtpv6bpOddHuy/GHdjWgNT VpU= X-IronPort-AV: E=Sophos;i="5.69,409,1571673600"; d="scan'208";a="127676480" Received: from h199-255-45-14.hgst.com (HELO uls-op-cesaep01.wdc.com) ([199.255.45.14]) by ob1.hgst.iphmx.com with ESMTP; 08 Jan 2020 16:36:52 +0800 IronPort-SDR: HJJzXmMFBp52Ku24qwUxdPKfbxzgxS5Ws1Vo8cvs7FSoL6tsp9Fn2Nw9s6qRsy5XZfC55TiESl mYiO6VznSFM9kHsEahRW6gBu5lxjfx5H5BOOFBeJGpLVgGn8zs3LHKZCkHx8UgJMMq6vDOAKnz lTFWXru+XTDkykLarXQW945M4d35399j+85QSXFx6Vz6A5k4OvSU6ERd7gM9I+HEllKiQMiGwC njYpzVWrcuGcc85x6//Ocj2EcqSh//cJ7ahQnCohlJIlhK9V3v67MZNSAVQrCuA/zfvAEgvhoV 4skb4h2M1fcb3Y1lEDxGaUlH Received: from uls-op-cesaip01.wdc.com ([10.248.3.36]) by uls-op-cesaep01.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Jan 2020 00:30:39 -0800 IronPort-SDR: pxymLGGSXSPFok/kU5jddnoc1zcxAubGflpW+wAAt53PVY57/SBZ+8butsKsB+Zj7scFuAG5Fg YNiTS1plRgtTagdW5CXRA8Ugh7YIZ/utF0LOzVSNbAFiZ9HtC0tSjyaky2Sns5ZIt3JwwOuF4i Mw4SMtnB8mUHUOKr3ouljLyCI41w/5SW0Nho/lxZgMK5+Nj83GAZjapoucQtfrZyc9abfW01/b TVI3JBsajHubea53QGQ8E8eNlm9NFa+edcrynaKwxzJCa0ZrpJzcaQDVXr3DZUJ8WwiT7k7M8y yWk= WDCIronportException: Internal Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by uls-op-cesaip01.wdc.com with ESMTP; 08 Jan 2020 00:36:49 -0800 From: Damien Le Moal To: linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-kernel@vger.kernel.org, Linus Torvalds Cc: Johannes Thumshirn , Naohiro Aota , "Darrick J . Wong" , Hannes Reinecke Subject: [PATCH v6 0/2] New zonefs file system Date: Wed, 8 Jan 2020 17:36:47 +0900 Message-Id: <20200108083649.450834-1-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org zonefs is a very simple file system exposing each zone of a zoned block device as a file. Unlike a regular file system with zoned block device support (e.g. f2fs or the on-going btrfs effort), zonefs does not hide the sequential write constraint of zoned block devices to the user. Files representing sequential write zones of the device must be written sequentially starting from the end of the file (append only writes). zonefs is not a POSIX compliant file system. It's goal is to simplify the implementation of zoned block devices support in applications by replacing raw block device file accesses with a richer file based API, avoiding relying on direct block device file ioctls which may be more obscure to developers. One example of this approach is the implementation of LSM (log-structured merge) tree structures (such as used in RocksDB and LevelDB) on zoned block devices by allowing SSTables to be stored in a zone file similarly to a regular file system rather than as a range of sectors of a zoned device. The introduction of the higher level construct "one file is one zone" can help reducing the amount of changes needed in the application while at the same time allowing the use of zoned block devices with various programming languages other than C. zonefs IO management implementation uses the new iomap generic code. Changes from v5: * Added simple description of zoned block devices to the documentation, as suggested by Johannes. * Added a 64-char max label field to the super block to allow label based identification of volumes using libblkid (checked with a patch to libblkid). Changes from v4: * Use octal values for file and directory permissions * Set initial directory permissions to 0555 (no write permission) * Prevent setting write permissions for directories Changes from v3: * Fixed many typos in the documentation * Use symbolic file permission macros instead of octal values (checkpatch.pl complains about this) Changes from v2: * Address comments and suggestions from Darrick: - Make the inode of OFFLINE and READONLY zones immutable when mounting. Also do this during zone information check after an IO error. - Change super block CRC seed to ~0. - Avoid potential compiler warning in zonefs_create_zgroup(). * Fixed endianness related compilation warning detected by kbuild bot. Changes from v1: * Fixed comment typo * Improved documentation as suggested by Hannes Damien Le Moal (2): fs: New zonefs file system zonefs: Add documentation Documentation/filesystems/zonefs.txt | 241 ++++++ MAINTAINERS | 10 + fs/Kconfig | 1 + fs/Makefile | 1 + fs/zonefs/Kconfig | 9 + fs/zonefs/Makefile | 4 + fs/zonefs/super.c | 1177 ++++++++++++++++++++++++++ fs/zonefs/zonefs.h | 175 ++++ include/uapi/linux/magic.h | 1 + 9 files changed, 1619 insertions(+) create mode 100644 Documentation/filesystems/zonefs.txt create mode 100644 fs/zonefs/Kconfig create mode 100644 fs/zonefs/Makefile create mode 100644 fs/zonefs/super.c create mode 100644 fs/zonefs/zonefs.h