Call terminate_connection when shelve_offloading

When nova performs a shelve offload for an instance, it needs to terminate
all the volume connections for that instance as with the shelve offload
it is not guaranteed that the instance will be placed on the same host once
it gets unshelved.
This change adds the call to the terminate_volume_connections on the
_shelve_offload_instance method in the compute manager.

Closes-Bug: #1547142

Change-Id: I8849ae0f54605e003d5b294ca3d66dcef89d7d27
(cherry picked from commit e89e1bdc60)

nova/compute/manager.py

@@ -4378,11 +4378,19 @@ class ComputeManager(manager.Manager):
         self.network_api.cleanup_instance_network_on_host(context, instance,
                                                           instance.host)
         network_info = self.network_api.get_instance_nw_info(context, instance)
+        bdms = objects.BlockDeviceMappingList.get_by_instance_uuid(
+            context, instance.uuid)
+
         block_device_info = self._get_instance_block_device_info(context,
-                                                                 instance)
+                                                                 instance,
+                                                                 bdms=bdms)
         self.driver.destroy(context, instance, network_info,
                 block_device_info)
 
+        # the instance is going to be removed from the host so we want to
+        # terminate all the connections with the volume server and the host
+        self._terminate_volume_connections(context, instance, bdms)
+
         instance.power_state = current_power_state
         # NOTE(mriedem): The vm_state has to be set before updating the
         # resource tracker, see vm_states.ALLOW_RESOURCE_REMOVAL. The host/node

nova/tests/unit/compute/test_shelve.py

@@ -47,6 +47,8 @@ def _fake_resources():
 
 
 class ShelveComputeManagerTestCase(test_compute.BaseTestCase):
+    @mock.patch.object(nova.compute.manager.ComputeManager,
+                       '_terminate_volume_connections')
     @mock.patch.object(nova.virt.fake.SmallFakeDriver, 'power_off')
     @mock.patch.object(nova.virt.fake.SmallFakeDriver, 'snapshot')
     @mock.patch.object(nova.compute.manager.ComputeManager, '_get_power_state')
@@ -55,7 +57,7 @@ class ShelveComputeManagerTestCase(test_compute.BaseTestCase):
     @mock.patch('nova.compute.utils.notify_about_instance_action')
     def _shelve_instance(self, shelved_offload_time, mock_notify,
                          mock_notify_instance_usage, mock_get_power_state,
-                         mock_snapshot, mock_power_off,
+                         mock_snapshot, mock_power_off, mock_terminate,
                          clean_shutdown=True):
         mock_get_power_state.return_value = 123
 
@@ -159,6 +161,9 @@ class ShelveComputeManagerTestCase(test_compute.BaseTestCase):
                                               'fake_image_id', mock.ANY)
         mock_get_power_state.assert_has_calls(mock_get_power_state_call_list)
 
+        if CONF.shelved_offload_time == 0:
+            self.assertTrue(mock_terminate.called)
+
     def test_shelve(self):
         self._shelve_instance(-1)
 
@@ -179,6 +184,8 @@ class ShelveComputeManagerTestCase(test_compute.BaseTestCase):
         instance = self._shelve_offload(clean_shutdown=False)
         mock_power_off.assert_called_once_with(instance, 0, 0)
 
+    @mock.patch.object(nova.compute.manager.ComputeManager,
+                       '_terminate_volume_connections')
     @mock.patch('nova.compute.resource_tracker.ResourceTracker.'
                 'delete_allocation_for_shelve_offloaded_instance')
     @mock.patch.object(nova.compute.manager.ComputeManager,
@@ -190,7 +197,8 @@ class ShelveComputeManagerTestCase(test_compute.BaseTestCase):
     @mock.patch('nova.compute.utils.notify_about_instance_action')
     def _shelve_offload(self, mock_notify, mock_notify_instance_usage,
                         mock_get_power_state, mock_update_resource_tracker,
-                        mock_delete_alloc, clean_shutdown=True):
+                        mock_delete_alloc, mock_terminate,
+                        clean_shutdown=True):
         host = 'fake-mini'
         instance = self._create_fake_instance_obj(params={'host': host})
         instance.task_state = task_states.SHELVING
@@ -208,6 +216,7 @@ class ShelveComputeManagerTestCase(test_compute.BaseTestCase):
 
         self.assertEqual(vm_states.SHELVED_OFFLOADED, instance.vm_state)
         self.assertIsNone(instance.task_state)
+        self.assertTrue(mock_terminate.called)
 
         # prepare expect call lists
         mock_notify_instance_usage_call_list = [