xfs: fail dax mount if reflink is enabled on a partition

Failure notification is not supported on partitions. So, when we mount a reflink enabled xfs on a partition with dax option, let it fail with -EINVAL code. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Shiyang Ruan <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Reviewed-by: Darrick J. Wong <[email protected]> Cc: Dave Chinner <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
wafgo · Jul 30, 2022 · 35fcd75 · 35fcd75
1 parent 873f64b
commit 35fcd75
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
@@ -350,8 +350,10 @@ xfs_setup_dax_always(
 		goto disable_dax;
 	}
 
-	if (xfs_has_reflink(mp)) {
-		xfs_alert(mp, "DAX and reflink cannot be used together!");
+	if (xfs_has_reflink(mp) &&
+	    bdev_is_partition(mp->m_ddev_targp->bt_bdev)) {
+		xfs_alert(mp,
+			"DAX and reflink cannot work with multi-partitions!");
 		return -EINVAL;
 	}