[PATCH v4 9/9] xfs: support STATX_DIOALIGN

[Eric Biggers]

From: Eric Biggers <ebiggers@xxxxxxxxxx>

Add support for STATX_DIOALIGN to xfs, so that direct I/O alignment
restrictions are exposed to userspace in a generic way.

Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
 fs/xfs/xfs_iops.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 29f5b8b8aca69a..bac3f56141801e 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -605,6 +605,15 @@ xfs_vn_getattr(
 		stat->blksize = BLKDEV_IOSIZE;
 		stat->rdev = inode->i_rdev;
 		break;
+	case S_IFREG:
+		if (request_mask & STATX_DIOALIGN) {
+			struct xfs_buftarg	*target = xfs_inode_buftarg(ip);
+
+			stat->result_mask |= STATX_DIOALIGN;
+			stat->dio_mem_align = target->bt_logical_sectorsize;
+			stat->dio_offset_align = target->bt_logical_sectorsize;
+		}
+		fallthrough;
 	default:
 		stat->blksize = xfs_stat_blksize(ip);
 		stat->rdev = 0;
-- 
2.37.0