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Wed, 16 Oct 2024 10:03:40 +0000 Received: from DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::4f45:f4ab:121:e088]) by DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::4f45:f4ab:121:e088%5]) with mapi id 15.20.8069.016; Wed, 16 Oct 2024 10:03:40 +0000 From: John Garry To: axboe@kernel.dk, brauner@kernel.org, djwong@kernel.org, viro@zeniv.linux.org.uk, jack@suse.cz, dchinner@redhat.com, hch@lst.de, cem@kernel.org Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, hare@suse.de, martin.petersen@oracle.com, catherine.hoang@oracle.com, mcgrof@kernel.org, ritesh.list@gmail.com, ojaswin@linux.ibm.com, John Garry Subject: [PATCH v9 0/8] block atomic writes for xfs Date: Wed, 16 Oct 2024 10:03:17 +0000 Message-Id: <20241016100325.3534494-1-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 X-ClientProxiedBy: LO4P123CA0080.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:190::13) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB4313:EE_|CY8PR10MB6634:EE_ X-MS-Office365-Filtering-Correlation-Id: 5dbb1383-8699-406a-9547-08dcedc9cf09 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|1800799024|366016|376014; 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Initially we will only support writing exactly 1x FS block atomically. Since we can now have FS block size > PAGE_SIZE for XFS, we can write atomically 4K+ blocks on x86. No special per-inode flag is required for enabling writing 1x F block. In future, to support writing more than one FS block atomically, a new FS XFLAG flag may then introduced - like FS_XFLAG_BIG_ATOMICWRITES. This would depend on a feature like forcealign. So if we format the FS for 16K FS block size: mkfs.xfs -b size=16384 /dev/sda The statx reports atomic write unit min/max = FS block size: $xfs_io -c statx filename ... stat.stx_atomic_write_unit_min = 16384 stat.stx_atomic_write_unit_max = 16384 stat.stx_atomic_write_segments_max = 1 ... Baseline is 77bfe1b11ea0 (tag: xfs-6.12-fixes-3, xfs/xfs-6.12-fixesC, xfs/for-next) xfs: fix a typo Patches for this series can be found at: https://github.com/johnpgarry/linux/tree/atomic-writes-v6.12-fs-v9 Changes since v8: - Add bdev atomic write unit helpers (Christoph) - Add comment on FS block size limit (Christoph) - Stylistic improvements (Christoph) - Add RB tags from Christoph (thanks!) Changes since v7: - Drop FS_XFLAG_ATOMICWRITES - Reorder block/fs patches and add fixes tags (Christoph) - Add RB tag from Christoph (Thanks!) - Rebase Changes since v6: - Add iomap documentation update (Darrick) - Drop reflink restriction (Darrick, Christoph) - Catch XFS buffered IO fallback (Darrick) - Check IOCB_DIRECT in generic_atomic_write_valid() - Tweaks to coding style (Darrick) - Add RB tags from Darrick and Christoph (thanks!) John Garry (8): block/fs: Pass an iocb to generic_atomic_write_valid() fs/block: Check for IOCB_DIRECT in generic_atomic_write_valid() block: Add bdev atomic write limits helpers fs: Export generic_atomic_write_valid() fs: iomap: Atomic write support xfs: Support atomic write for statx xfs: Validate atomic writes xfs: Support setting FMODE_CAN_ATOMIC_WRITE .../filesystems/iomap/operations.rst | 11 ++++++ block/fops.c | 22 ++++++----- fs/iomap/direct-io.c | 38 +++++++++++++++++-- fs/iomap/trace.h | 3 +- fs/read_write.c | 16 +++++--- fs/xfs/xfs_buf.c | 7 ++++ fs/xfs/xfs_buf.h | 4 ++ fs/xfs/xfs_file.c | 16 ++++++++ fs/xfs/xfs_inode.h | 15 ++++++++ fs/xfs/xfs_iops.c | 22 +++++++++++ include/linux/blkdev.h | 16 ++++++++ include/linux/fs.h | 2 +- include/linux/iomap.h | 1 + 13 files changed, 151 insertions(+), 22 deletions(-)