From patchwork Wed Jan 29 13:11:16 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: 11356177 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 5E10692A for ; Wed, 29 Jan 2020 13:11:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3CBC020720 for ; Wed, 29 Jan 2020 13:11:37 +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="lmlYOn76" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726498AbgA2NLY (ORCPT ); Wed, 29 Jan 2020 08:11:24 -0500 Received: from esa3.hgst.iphmx.com ([216.71.153.141]:26879 "EHLO esa3.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726145AbgA2NLX (ORCPT ); Wed, 29 Jan 2020 08:11:23 -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=1580303484; x=1611839484; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=kaXbQ3VnyLKhAOOw7SmGiwrO5BRWfXbeUMYSdvwgVDE=; b=lmlYOn760xTAXVXygnWi4y0/btyN27HOm4acXhXxUT+dEpHIeTjro8y9 o/v5OIzRnNQo6uK5DdkQBKyFIELJyVFe32W7t9Eix7PlaH+P/CumZ9lCJ mIDN0lI/obGdYX7Cthj4tZe7aWoZbNoMIP/N/LX3vhdCPuI6Rqan2vobR y/n5H3hMo4r2G7kOjbGDrmPuVIwrRE2TtzVM10r0XqcaBFHyN/sODYMEi Andw3MNP3u6qRbEVL+nwDLuJB704b6ZAG/IP9cS36KZJy/EDMzW/yRCF8 ah8B1U21E2o43JSlEamTWNg7SsrGG7yQSc4488TwpgDU8Lf4bZ8yP2QoO A==; IronPort-SDR: zGSgqjxPBoMBDj4UvVwnC+Hd4dsj0nmN7urzfrqHIqn4vYSwzupEAekcDuDLH94YBlLixbpa24 gWpi9GmU7i1ouxzWHg2jyX2Fv29GIiwjx9kw4aOu/SL0NUXP+/c2psRV202ganQkfuto1X8VWA 5UxA2C/DCBqbzColZOYXHuzA5QGuqIdEUvJWczq0RBuVG+2/uB+qAEt18Ry4UMoiAuYSSklWDe 508Tg0WiWnFyD5nYjhxFSl7Nzu6vOBQoGE2+0P/Q6j7LA6jXtHPJkXhrPaO+wyTDv/dNg5HSn0 l+0= X-IronPort-AV: E=Sophos;i="5.70,378,1574092800"; d="scan'208";a="133015486" 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; 29 Jan 2020 21:11:21 +0800 IronPort-SDR: e2GORArXlfk71oZu87mud0q3siLFLxoxQ9Kn5dGG3aQzq2dLl96qiC1MHJ5kX2p+bUgE7Js3U3 ThUIIS9xJcEcyUZ+Vun0qAW8D3gd/BpIytSw30tXoXrLE568Yn4rkfYMasw85E/RnwAtkygIm5 jfmLVL8xYAMI8ADJcNl+UzxYG40heeFXk6GfGsEgGZVhkULXAlJYO9cs3xiUSaKVhkH3l0jPRV gIKdCkEq30ybLdg/r14w7ZfZs2akeqDkuv/RDYHBvqFxNBFKWiPbq/cMOAC2wgnDNXdawLDNtS gm/T344+WJpW5WmtzenhpCVq 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; 29 Jan 2020 05:04:33 -0800 IronPort-SDR: CqDzV+jhUfE70hV9Hd1ksIudoG992u7Ybs4z4GkZz4kh8NmifeotyTHsMxxuPxxrEQp8bculEy OOhpa9plbeHX7W98gPh9IgGDkHlwFPYasJeozeNN4ImQGk+6xB2IxrtmR5mg9sI3Dl2ye5dGhw A5q0s+Gw7WrXZ8fKH1mWVePH9dVGuZtjA8pxFYAXLpBtKbwVsvAE688calcNczMr//xNHLtvRp EPw50iJf39XD+KwquiBiGPArsG9Fq1V65V5G/VxGJ4YTY3Wgh0FtkC3li98ZJbsdwPyMb0a0IG 5CA= WDCIronportException: Internal Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by uls-op-cesaip01.wdc.com with ESMTP; 29 Jan 2020 05:11:19 -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 v10 0/2] New zonefs file system Date: Wed, 29 Jan 2020 22:11:16 +0900 Message-Id: <20200129131118.998939-1-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@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 v9: * Changed mount options to ia more useful set of possible actions for zone corruption handling: repair, remount-ro, zone-ro or zone-offline * Check IMMUTABLE inodes to prevent write operations * Documented mount options Changes from v8: * Comments typos fixes and improvements as suggested by Darrick and Dave. * Improved IO error handling: - Better sequential file write pointer checks on write IO error - Extended zone condition checks on IO error to all types of IOs - Added mount options for controlling the FS behavior when a zone write pointer corruption is detected. * Cleanup zonefs_iomap_begin() and its use in zonefs_map_blocks() * Ignore RWF_NOWAIT to avoid out of order writes on sequential zone files. * Improved documentation file Changes from v7: * Fixed static checker warnings: - Set-but-not-used variable in zonefs_file_buffered_write() - Use S_ISDIR() in zonefs_inode_setattr() Changes from v6: * Fixed documentation as suggested by Randy. 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 | 301 ++++++ MAINTAINERS | 10 + fs/Kconfig | 1 + fs/Makefile | 1 + fs/zonefs/Kconfig | 9 + fs/zonefs/Makefile | 4 + fs/zonefs/super.c | 1427 ++++++++++++++++++++++++++ fs/zonefs/zonefs.h | 192 ++++ include/uapi/linux/magic.h | 1 + 9 files changed, 1946 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