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Thu, 13 Mar 2025 17:13:22 +0000 Received: from DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::4f45:f4ab:121:e088]) by DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::4f45:f4ab:121:e088%6]) with mapi id 15.20.8511.026; Thu, 13 Mar 2025 17:13:22 +0000 From: John Garry To: brauner@kernel.org, djwong@kernel.org, cem@kernel.org, dchinner@redhat.com, hch@lst.de Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, ojaswin@linux.ibm.com, ritesh.list@gmail.com, martin.petersen@oracle.com, tytso@mit.edu, linux-ext4@vger.kernel.org, John Garry Subject: [PATCH v6 00/13] large atomic writes for xfs with CoW Date: Thu, 13 Mar 2025 17:12:57 +0000 Message-Id: <20250313171310.1886394-1-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 X-ClientProxiedBy: LO3P265CA0033.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:387::16) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB4313:EE_|BLAPR10MB5011:EE_ X-MS-Office365-Filtering-Correlation-Id: 8359a43a-4b9d-41b9-c32c-08dd62525bbd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|1800799024; 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This series introduces a method to issue atomic writes via a software emulated method. The software emulated method is used as a fallback for when attempting to issue an atomic write over misaligned or multiple extents. For XFS, this support is based on CoW. The basic idea of this CoW method is to alloc a range in the CoW fork, write the data, and atomically update the mapping. Initial mysql performance testing has shown this method to perform ok. However, there we are only using 16K atomic writes (and 4K block size), so typically - and thankfully - this software fallback method won't be used often. For other FSes which want large atomics writes and don't support CoW, I think that they can follow the example in [0]. Based on 4c6283ec9284 (xfs/xfs-6.15-zoned_devices, xfs/xfs-6.15-merge) Merge tag 'xfs-zoned-allocator-2025-03-03' of git://git.infradead.org/users/hch/xfs into xfs-6.15-zoned_devices [0] https://lore.kernel.org/linux-xfs/20250102140411.14617-1-john.g.garry@oracle.com/ Differences to v5: - comment on atomic write checks in iomap_dio_bio_iter() (Christoph) - inline iomap_dio_bio_opflags (Christoph) - many comments added (Christoph, Dave) - reorder patches - rework iomap flags (Christoph, Dave) - add xfs_get_atomic_write_{min,max}_attr (Christoph) - add XFS_REFLINK_ALLOC_EXTSZALIGN - change XFS_REFLINK_CONVERT -> XFS_REFLINK_CONVERT_UNWRITTEN (Christoph) Differences to v4: - Omit iomap patches which have already been queued - Add () in xfs_bmap_compute_alignments() (Dave) - Rename awu_max -> m_awu_max (Carlos) - Add RFC to change IOMAP flag names - Rebase John Garry (13): iomap: inline iomap_dio_bio_opflags() iomap: comment on atomic write checks in iomap_dio_bio_iter() iomap: rework IOMAP atomic flags xfs: pass flags to xfs_reflink_allocate_cow() xfs: allow block allocator to take an alignment hint xfs: switch atomic write size check in xfs_file_write_iter() xfs: refactor xfs_reflink_end_cow_extent() xfs: reflink CoW-based atomic write support xfs: add XFS_REFLINK_ALLOC_EXTSZALIGN xfs: iomap COW-based atomic write support xfs: add xfs_file_dio_write_atomic() xfs: commit CoW-based atomic writes atomically xfs: update atomic write max size fs/ext4/inode.c | 5 +- fs/iomap/direct-io.c | 125 ++++++++++++++---------------- fs/iomap/trace.h | 2 +- fs/xfs/libxfs/xfs_bmap.c | 5 ++ fs/xfs/libxfs/xfs_bmap.h | 6 +- fs/xfs/xfs_file.c | 90 ++++++++++++++++++++-- fs/xfs/xfs_iomap.c | 141 +++++++++++++++++++++++++++++++++- fs/xfs/xfs_iomap.h | 1 + fs/xfs/xfs_iops.c | 40 ++++++++-- fs/xfs/xfs_iops.h | 2 + fs/xfs/xfs_mount.c | 29 +++++++ fs/xfs/xfs_mount.h | 1 + fs/xfs/xfs_reflink.c | 160 +++++++++++++++++++++++++++++---------- fs/xfs/xfs_reflink.h | 14 +++- include/linux/iomap.h | 12 ++- 15 files changed, 499 insertions(+), 134 deletions(-)