Add share_info parameter to resume method for each driver (driver part)

This patch allow to pass share_info parameter to the resume
method. So it will allow to resume an instance and keep the
shares attached.

Manila is the OpenStack Shared Filesystems service.
These series of patches implement changes required in Nova to allow the shares
provided by Manila to be associated with and attached to instances using
virtiofs.

Implements: blueprint libvirt-virtiofs-attach-manila-shares
Change-Id: I66da2b010caa7e7bed15e69c1e14fd22ca1c8a31

nova/tests/unit/virt/libvirt/test_driver.py

@@ -18298,10 +18298,18 @@ class LibvirtConnTestCase(test.NoDBTestCase,
               _attach_mediated_devices):
             get_image_metadata.return_value = {'bar': 234}
 
+            share_info = objects.share_mapping.ShareMappingList()
+
             drvr.resume(self.context, instance, network_info,
-                        block_device_info)
-            _get_existing_domain_xml.assert_has_calls([mock.call(instance,
-                                            network_info, block_device_info)])
+                        block_device_info, share_info=share_info)
+            _get_existing_domain_xml.assert_has_calls(
+                [mock.call(
+                    instance,
+                    network_info,
+                    block_device_info,
+                    share_info
+                )]
+            )
             _create_guest_with_network.assert_has_calls([
                 mock.call(
                     self.context, dummyxml, instance, network_info,

nova/virt/driver.py

@@ -972,7 +972,14 @@ class ComputeDriver(object):
         """
         raise NotImplementedError()
 
-    def resume(self, context, instance, network_info, block_device_info=None):
+    def resume(
+        self,
+        context,
+        instance,
+        network_info,
+        block_device_info=None,
+        share_info=None
+    ):
         """resume the specified suspended instance.
 
         The suspended instance gets resumed and will use CPU cycles and memory
@@ -988,6 +995,8 @@ class ComputeDriver(object):
             Necessary network information for the resume.
         :param dict block_device_info:
             Instance volume block device info.
+        :param nova.objects.share_mapping.ShareMapingList share_info
+            optional list of share_mapping
 
         :return: None
         """

nova/virt/fake.py

@@ -321,7 +321,14 @@ class FakeDriver(driver.ComputeDriver):
     def suspend(self, context, instance):
         pass
 
-    def resume(self, context, instance, network_info, block_device_info=None):
+    def resume(
+        self,
+        context,
+        instance,
+        network_info,
+        block_device_info=None,
+        share_info=None
+    ):
         pass
 
     def destroy(self, context, instance, network_info, block_device_info=None,

nova/virt/libvirt/driver.py

@@ -2441,7 +2441,7 @@ class LibvirtDriver(driver.ComputeDriver):
         self._disconnect_volume(context, old_connection_info, instance)
 
     def _get_existing_domain_xml(self, instance, network_info,
-                                 block_device_info=None):
+                                 block_device_info=None, share_info=None):
         try:
             guest = self._host.get_guest(instance)
             xml = guest.get_xml_desc()
@@ -2453,7 +2453,8 @@ class LibvirtDriver(driver.ComputeDriver):
             xml = self._get_guest_xml(nova_context.get_admin_context(),
                                       instance, network_info, disk_info,
                                       instance.image_meta,
-                                      block_device_info=block_device_info)
+                                      block_device_info=block_device_info,
+                                      share_info=share_info)
         return xml
 
     def emit_event(self, event: virtevent.InstanceEvent) -> None:
@@ -4400,10 +4401,20 @@ class LibvirtDriver(driver.ComputeDriver):
         self._detach_mediated_devices(guest)
         guest.save_memory_state()
 
-    def resume(self, context, instance, network_info, block_device_info=None):
+    def resume(
+        self,
+        context,
+        instance,
+        network_info,
+        block_device_info=None,
+        share_info=None
+    ):
         """resume the specified instance."""
+        if share_info is None:
+            share_info = objects.ShareMappingList()
+
         xml = self._get_existing_domain_xml(instance, network_info,
-                                            block_device_info)
+                                            block_device_info, share_info)
         # NOTE(gsantos): The mediated devices that were removed on suspension
         # are still present in the xml. Let's take their references from it
         # and re-attach them.

nova/virt/vmwareapi/driver.py

@@ -644,7 +644,14 @@ class VMwareVCDriver(driver.ComputeDriver):
         """Suspend the specified instance."""
         self._vmops.suspend(instance)
 
-    def resume(self, context, instance, network_info, block_device_info=None):
+    def resume(
+        self,
+        context,
+        instance,
+        network_info,
+        block_device_info=None,
+        share_info=None
+    ):
         """Resume the suspended VM instance."""
         self._vmops.resume(instance)