[SVF] Fixed update_rep_properties for empty values

[Spectrum Virtualize Family] During
_update_replication_properties, some empty value
volume relationship attributes of mirror volumes
are not updated in volume metadata.

Fixed the above issue by removing the check that filters
only non-empty values of volume relationship properties.

Closes-Bug: #1935670
Change-Id: Ief710f5f337671c4aaf21899c69e3ccd62743d9e

cinder/tests/unit/volume/drivers/ibm/test_storwize_svc.py

@@ -13048,3 +13048,41 @@ class StorwizeSVCReplicationTestCase(test.TestCase):
         model_update = self.driver.delete_group(self.ctxt, clone_group,
                                                 [clone_vol1, clone_vol2])
         self.assertEqual(fields.GroupStatus.DELETED, model_update[0]['status'])
+
+    @ddt.data(({'volume_type': 'gm_type'}),
+              ({'volume_type': 'mm_type'}),
+              ({'volume_type': 'gmcv_default_type'}),
+              ({'volume_type': 'non_replica_type'})
+              )
+    def test_update_replication_properties_on_create_volume(self, vol_spec):
+        self.driver.configuration.set_override('replication_device',
+                                               [self.rep_target])
+        self.driver.do_setup(self.ctxt)
+        vol_type = getattr(self, vol_spec['volume_type'])
+
+        with mock.patch.object(
+                storwize_svc_common.StorwizeSVCCommonDriver,
+                '_update_replication_properties') as update_rep_properties:
+            volume, model_update = self._create_test_volume(vol_type)
+            if vol_type == self.non_replica_type:
+                self.assertFalse(update_rep_properties.called)
+            else:
+                self.assertTrue(update_rep_properties.called)
+            self.driver.delete_volume(volume)
+
+        # Create metro mirror replication.
+        volume, model_update = self._create_test_volume(vol_type)
+        if 'metadata' in model_update:
+            expected_sync_attr_value = ''
+            expected_freeze_time = ''
+            expected_primary = 'master'
+            expected_mirroring_state = 'inconsistent_copying'
+            self.assertEqual(model_update['metadata']['Sync'],
+                             expected_sync_attr_value)
+            self.assertEqual(model_update['metadata']['Freeze Time'],
+                             expected_freeze_time)
+            self.assertEqual(model_update['metadata']['Primary'],
+                             expected_primary)
+            self.assertEqual(model_update['metadata']['Mirroring State'],
+                             expected_mirroring_state)
+        self.driver.delete_volume(volume)

cinder/volume/drivers/ibm/storwize_svc/storwize_svc_common.py

@@ -3440,8 +3440,7 @@ class StorwizeSVCCommonDriver(san.SanDriver,
                     del model_update['metadata'][key]
         else:
             for key, value in rep_properties.items():
-                if rel_info.get(value):
-                    model_update['metadata'][key] = rel_info[value]
+                model_update['metadata'][key] = rel_info.get(value)
         return model_update
 
     def create_volume(self, volume):

releasenotes/notes/bug-1935670-svc_update_rep_properties_for_empty_values_fix-a2faabbf2139195e.yaml

@@ -0,0 +1,6 @@
+fixes:
+  - |
+    IBM Spectrum Virtualize Family driver: `Bug #1935670
+    <https://bugs.launchpad.net/cinder/+bug/1935670>`_:
+    Fixed empty attribute values issue while updating
+    volume metadata table for replicated volumes.