dm error: mark as DM_TARGET_PASSES_INTEGRITY

Mark dm error as DM_TARGET_PASSES_INTEGRITY so that it can be stacked on
top of PI capable devices.  The claim is strictly speaking as lie as dm
error fails all I/O and doesn't pass anything on, but doing the same for
integrity I/O work just fine :)

This helps to make about two dozen xfstests test cases pass on PI capable
devices.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

Author: Christoph Hellwig

drivers/md/dm-target.c

@@ -263,7 +263,8 @@ static long io_err_dax_direct_access(struct dm_target *ti, pgoff_t pgoff,
 static struct target_type error_target = {
 	.name = "error",
 	.version = {1, 7, 0},
-	.features = DM_TARGET_WILDCARD | DM_TARGET_ZONED_HM,
+	.features = DM_TARGET_WILDCARD | DM_TARGET_ZONED_HM |
+		DM_TARGET_PASSES_INTEGRITY,
 	.ctr  = io_err_ctr,
 	.dtr  = io_err_dtr,
 	.map  = io_err_map,