After v4.12 commit e2460f2a4bc7 ("dm: mark targets that pass integrity
data"), dm-multipath, e.g. on DIF+DIX SCSI disk paths, does not support
block integrity any more. So add it to the whitelist.

This is also a pre-requisite to use block integrity with other dm layer(s)
on top of multipath, such as kpartx partitions (dm-linear) or LVM.

Signed-off-by: Steffen Maier <redacted>
Bisected-by: Fedor Loshakov [off-list ref]
Fixes: e2460f2a4bc7 ("dm: mark targets that pass integrity data")
Cc: <redacted> #4.12+
---
 drivers/md/dm-mpath.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 3fde9e9faddd..c174f0c53dc9 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c

@@ -2023,7 +2023,8 @@ static int multipath_busy(struct dm_target *ti)
 static struct target_type multipath_target = {
 	.name = "multipath",
 	.version = {1, 12, 0},
-	.features = DM_TARGET_SINGLETON | DM_TARGET_IMMUTABLE,
+	.features = DM_TARGET_SINGLETON | DM_TARGET_IMMUTABLE |
+		    DM_TARGET_PASSES_INTEGRITY,
 	.module = THIS_MODULE,
 	.ctr = multipath_ctr,
 	.dtr = multipath_dtr,