90dm: fixup dependency cycle between MD and DM shutdown

DM devices might be located on top of MD devices, so we need to
call the DM shutdown script before MD shutdown. The exception
here are multipath devices, which are below MD devices.
So skip removing multipath devices here to avoid spurious errors.

References: bsc#994860

Signed-off-by: Hannes Reinecke <hare@suse.com>

modules.d/90dm/dm-shutdown.sh

@@ -9,8 +9,18 @@ _remove_dm() {
         [ -e ${s} ] || continue
         _remove_dm ${s##*/}
     done
-    devname=$(cat /sys/block/${dev}/dm/name)
-    dmsetup -v --noudevsync remove "$devname" || return $?
+    # multipath devices might have MD devices on top,
+    # which are removed after this script. So do not
+    # remove those to avoid spurious errors
+    case $(cat /sys/block/${dev}/dm/uuid) in
+        mpath-*)
+            return 0
+            ;;
+        *)
+            devname=$(cat /sys/block/${dev}/dm/name)
+            dmsetup -v --noudevsync remove "$devname" || return $?
+            ;;
+    esac
     return 0
 }
 

modules.d/90dm/module-setup.sh

@@ -38,6 +38,6 @@ install() {
     inst_rules "$moddir/59-persistent-storage-dm.rules"
     prepare_udev_rules 59-persistent-storage-dm.rules
 
-    inst_hook shutdown 30 "$moddir/dm-shutdown.sh"
+    inst_hook shutdown 25 "$moddir/dm-shutdown.sh"
 }