Handle rbd.OSError on broken RBD image

With Rocky, cinder-volume began to fail again with another error type.
This patch adds rbd.OSError type for exception block of
_get_usage_info method.

Change-Id: I93b8afeddae18d098fe926a3219811cc8c8d9b63
Closes-Bug: 1698786

cinder/tests/unit/volume/drivers/test_rbd.py

@@ -69,6 +69,10 @@ class MockImageExistsException(MockException):
     """Used as mock for rbd.ImageExists."""
 
 
+class MockOSErrorException(MockException):
+    """Used as mock for rbd.OSError."""
+
+
 class KeyObject(object):
     def get_encoded(arg):
         return "asdf".encode('utf-8')
@@ -2101,17 +2105,24 @@ class RBDTestCase(test.TestCase):
             return mock.Mock(return_value=mock.Mock(
                 size=mock.Mock(side_effect=(size_or_exc,))))
 
-        volumes = ['volume-1', 'non-existent', 'non-cinder-volume']
+        volumes = [
+            'volume-1',
+            'non-existent',
+            'non-existent',
+            'non-cinder-volume'
+        ]
 
         client = client_mock.return_value.__enter__.return_value
         rbdproxy_mock.return_value.list.return_value = volumes
 
         with mock.patch.object(self.driver, 'rbd',
-                               ImageNotFound=MockImageNotFoundException):
+                               ImageNotFound=MockImageNotFoundException,
+                               OSError=MockOSErrorException):
             volproxy_mock.side_effect = [
                 mock.MagicMock(**{'__enter__': FakeVolProxy(s)})
                 for s in (1.0 * units.Gi,
                           self.driver.rbd.ImageNotFound,
+                          self.driver.rbd.OSError,
                           2.0 * units.Gi)
             ]
             total_provision = self.driver._get_usage_info()

cinder/volume/drivers/rbd.py

@@ -410,7 +410,7 @@ class RBDDriver(driver.CloneableImageVD, driver.MigrateVD,
                                         client=client.cluster,
                                         ioctx=client.ioctx) as v:
                         size = v.size()
-                except self.rbd.ImageNotFound:
+                except (self.rbd.ImageNotFound, self.rbd.OSError):
                     LOG.debug("Image %s is not found.", t)
                 else:
                     total_provisioned += size