extend volume method

implementation/storage/OpenstackStorageManager.py

@@ -61,6 +61,14 @@ class OpenstackStorageManager(StorageManager):
 
         return True
 
+    def extend(self, id, size):
+        try:
+            self.openstack.block_storage.extend_volume(id, size)
+        except ResourceNotFound:
+            return False
+
+        return True
+
     def list(self):
         volumes = []
 

interface/storage/StorageManager.py

@@ -17,5 +17,8 @@ class StorageManager:
     def delete(self, id):
         raise NotImplementedError
 
+    def extend(self, id, size):
+        raise NotImplementedError
+
     def list(self):
         raise NotImplementedError