Fix No weighed backend found

patches/cinder-vitastor.py

@@ -275,6 +275,15 @@ class VitastorDriver(driver.CloneableImageVD,
             LOG.exception('error getting vitastor pool stats: '+str(e))
 
         self._stats = stats
+        
+    def get_volume_stats(self, refresh=False):
+        """Get volume stats.
+        If 'refresh' is True, run update the stats first.
+        """
+        if not self._stats or refresh:
+            self._update_volume_stats()
+
+        return self._stats
 
     def _next_id(self, resp):
         if len(resp['kvs']) == 0:
@@ -824,7 +833,6 @@ class VitastorDriver(driver.CloneableImageVD,
 
     def manage_existing_get_size(self, volume, existing_ref):
         """Return size of an existing image for manage_existing.
-
         :param volume: volume ref info to be set
         :param existing_ref: {'source-name': <image name>}
         """
@@ -836,9 +844,7 @@ class VitastorDriver(driver.CloneableImageVD,
 
     def manage_existing(self, volume, existing_ref):
         """Manages an existing image.
-
         Renames the image name to match the expected name for the volume.
-
         :param volume: volume ref info to be set
         :param existing_ref: {'source-name': <image name>}
         """
@@ -912,7 +918,6 @@ class VitastorDriver(driver.CloneableImageVD,
 
     def manage_existing_snapshot_get_size(self, snapshot, existing_ref):
         """Return size of an existing image for manage_existing.
-
         :param snapshot: snapshot ref info to be set
         :param existing_ref: {'source-name': <name of snapshot>}
         """
@@ -927,10 +932,8 @@ class VitastorDriver(driver.CloneableImageVD,
 
     def manage_existing_snapshot(self, snapshot, existing_ref):
         """Manages an existing snapshot.
-
         Renames the snapshot name to match the expected name for the snapshot.
         Error checking done by manage_existing_get_size is not repeated.
-
         :param snapshot: snapshot ref info to be set
         :param existing_ref: {'source-name': <name of snapshot>}
         """