linux-kernel - [PATCH RFC 03/16] xfs: Support atomic write for statx

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Date:   Wed,  3 May 2023 18:38:08 +0000
From:   John Garry <john.g.garry@...cle.com>
To:     axboe@...nel.dk, kbusch@...nel.org, hch@....de, sagi@...mberg.me,
        martin.petersen@...cle.com, djwong@...nel.org,
        viro@...iv.linux.org.uk, brauner@...nel.org, dchinner@...hat.com,
        jejb@...ux.ibm.com
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-scsi@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-security-module@...r.kernel.org, paul@...l-moore.com,
        jmorris@...ei.org, serge@...lyn.com,
        John Garry <john.g.garry@...cle.com>
Subject: [PATCH RFC 03/16] xfs: Support atomic write for statx

Support providing info on atomic write unit min and max.

Darrick Wong originally authored this change.

Signed-off-by: John Garry <john.g.garry@...cle.com>
---
 fs/xfs/xfs_iops.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 24718adb3c16..e542077704aa 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -614,6 +614,16 @@ 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) {
+			struct xfs_buftarg	*target = xfs_inode_buftarg(ip);
+			struct block_device	*bdev = target->bt_bdev;
+
+			stat->atomic_write_unit_min = queue_atomic_write_unit_min(bdev->bd_queue);
+			stat->atomic_write_unit_max = queue_atomic_write_unit_max(bdev->bd_queue);
+			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);
-- 
2.31.1