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

[John Garry]

Support providing info on atomic write unit min and max.

Darrick Wong originally authored this change.

Signed-off-by: John Garry <john.g.garry@xxxxxxxxxx>
---
 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