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Fri, 29 Sep 2023 10:28:31 +0000 Received: from DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::ebfd:c49c:6b8:6fce]) by DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::ebfd:c49c:6b8:6fce%7]) with mapi id 15.20.6813.027; Fri, 29 Sep 2023 10:28:31 +0000 From: John Garry To: axboe@kernel.dk, kbusch@kernel.org, hch@lst.de, sagi@grimberg.me, jejb@linux.ibm.com, martin.petersen@oracle.com, djwong@kernel.org, viro@zeniv.linux.org.uk, brauner@kernel.org, chandan.babu@oracle.com, dchinner@redhat.com Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, tytso@mit.edu, jbongio@google.com, linux-api@vger.kernel.org, John Garry Subject: [PATCH 15/21] fs: xfs: Support atomic write for statx Date: Fri, 29 Sep 2023 10:27:20 +0000 Message-Id: <20230929102726.2985188-16-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230929102726.2985188-1-john.g.garry@oracle.com> References: <20230929102726.2985188-1-john.g.garry@oracle.com> X-ClientProxiedBy: PH8PR21CA0012.namprd21.prod.outlook.com (2603:10b6:510:2ce::6) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB4313:EE_|PH7PR10MB6153:EE_ X-MS-Office365-Filtering-Correlation-Id: 9d8248e9-8bac-42aa-2fc9-08dbc0d6d3d9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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For simplicity, currently we limit the min at the FS block size, but a lower limit could be supported in future. The atomic write unit min and max is limited by the guaranteed extent alignment for the inode. Signed-off-by: John Garry --- fs/xfs/xfs_iops.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++ fs/xfs/xfs_iops.h | 4 ++++ 2 files changed, 55 insertions(+) diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index 1c1e6171209d..5bff80748223 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c @@ -546,6 +546,46 @@ xfs_stat_blksize( return PAGE_SIZE; } +void xfs_ip_atomic_write_attr(struct xfs_inode *ip, + xfs_filblks_t *unit_min_fsb, + xfs_filblks_t *unit_max_fsb) +{ + xfs_extlen_t extsz_hint = xfs_get_extsz_hint(ip); + struct xfs_buftarg *target = xfs_inode_buftarg(ip); + struct block_device *bdev = target->bt_bdev; + struct xfs_mount *mp = ip->i_mount; + xfs_filblks_t atomic_write_unit_min, + atomic_write_unit_max, + align; + + atomic_write_unit_min = XFS_B_TO_FSB(mp, + queue_atomic_write_unit_min_bytes(bdev->bd_queue)); + atomic_write_unit_max = XFS_B_TO_FSB(mp, + queue_atomic_write_unit_max_bytes(bdev->bd_queue)); + + /* for RT, unset extsize gives hint of 1 */ + /* for !RT, unset extsize gives hint of 0 */ + if (extsz_hint && (XFS_IS_REALTIME_INODE(ip) || + (ip->i_diflags2 & XFS_DIFLAG2_FORCEALIGN))) + align = extsz_hint; + else + align = 1; + + if (atomic_write_unit_max == 0) { + *unit_min_fsb = 0; + *unit_max_fsb = 0; + } else if (atomic_write_unit_min == 0) { + *unit_min_fsb = 1; + *unit_max_fsb = min_t(xfs_filblks_t, atomic_write_unit_max, + align); + } else { + *unit_min_fsb = min_t(xfs_filblks_t, atomic_write_unit_min, + align); + *unit_max_fsb = min_t(xfs_filblks_t, atomic_write_unit_max, + align); + } +} + STATIC int xfs_vn_getattr( struct mnt_idmap *idmap, @@ -614,6 +654,17 @@ xfs_vn_getattr( stat->dio_mem_align = bdev_dma_alignment(bdev) + 1; stat->dio_offset_align = bdev_logical_block_size(bdev); } + if (request_mask & STATX_WRITE_ATOMIC) { + xfs_filblks_t unit_min_fsb, unit_max_fsb; + + xfs_ip_atomic_write_attr(ip, &unit_min_fsb, + &unit_max_fsb); + stat->atomic_write_unit_min = XFS_FSB_TO_B(mp, unit_min_fsb); + stat->atomic_write_unit_max = XFS_FSB_TO_B(mp, unit_max_fsb); + stat->attributes |= STATX_ATTR_WRITE_ATOMIC; + stat->attributes_mask |= STATX_ATTR_WRITE_ATOMIC; + stat->result_mask |= STATX_WRITE_ATOMIC; + } fallthrough; default: stat->blksize = xfs_stat_blksize(ip); diff --git a/fs/xfs/xfs_iops.h b/fs/xfs/xfs_iops.h index 7f84a0843b24..b1e683b04301 100644 --- a/fs/xfs/xfs_iops.h +++ b/fs/xfs/xfs_iops.h @@ -19,4 +19,8 @@ int xfs_vn_setattr_size(struct mnt_idmap *idmap, int xfs_inode_init_security(struct inode *inode, struct inode *dir, const struct qstr *qstr); +void xfs_ip_atomic_write_attr(struct xfs_inode *ip, + xfs_filblks_t *unit_min_fsb, + xfs_filblks_t *unit_max_fsb); + #endif /* __XFS_IOPS_H__ */