diff --git a/nova/block_device.py b/nova/block_device.py
index 6d955faa2267..46922567b7c9 100644
--- a/nova/block_device.py
+++ b/nova/block_device.py
@@ -529,3 +529,19 @@ def volume_in_mapping(mount_device, block_device_info):
 
     LOG.debug("block_device_list %s", block_device_list)
     return strip_dev(mount_device) in block_device_list
+
+
+def get_bdm_ephemeral_disk_size(block_device_mappings):
+    return sum(bdm.get('volume_size', 0)
+            for bdm in block_device_mappings
+            if new_format_is_ephemeral(bdm))
+
+
+def get_bdm_swap_list(block_device_mappings):
+    return [bdm for bdm in block_device_mappings
+            if new_format_is_swap(bdm)]
+
+
+def get_bdm_local_disk_num(block_device_mappings):
+    return len([bdm for bdm in block_device_mappings
+                if bdm.get('destination_type') == 'local'])
diff --git a/nova/tests/test_block_device.py b/nova/tests/test_block_device.py
index 79c642b23636..1e86405a1a93 100644
--- a/nova/tests/test_block_device.py
+++ b/nova/tests/test_block_device.py
@@ -26,6 +26,46 @@ from nova.tests import matchers
 
 
 class BlockDeviceTestCase(test.NoDBTestCase):
+    def setUp(self):
+        super(BlockDeviceTestCase, self).setUp()
+        BDM = block_device.BlockDeviceDict
+
+        self.new_mapping = [
+            BDM({'id': 1, 'instance_uuid': 'fake-instance',
+                 'device_name': '/dev/sdb1',
+                 'source_type': 'blank',
+                 'destination_type': 'local',
+                 'delete_on_termination': True,
+                 'volume_size': 1,
+                 'guest_format': 'swap',
+                 'boot_index': -1}),
+            BDM({'id': 2, 'instance_uuid': 'fake-instance',
+                 'device_name': '/dev/sdc1',
+                 'source_type': 'blank',
+                 'destination_type': 'local',
+                 'volume_size': 10,
+                 'delete_on_termination': True,
+                 'boot_index': -1}),
+            BDM({'id': 3, 'instance_uuid': 'fake-instance',
+                 'device_name': '/dev/sda1',
+                 'source_type': 'volume',
+                 'destination_type': 'volume',
+                 'volume_id': 'fake-volume-id-1',
+                 'connection_info': "{'fake': 'connection_info'}",
+                 'boot_index': 0}),
+            BDM({'id': 4, 'instance_uuid': 'fake-instance',
+                 'device_name': '/dev/sda2',
+                 'source_type': 'snapshot',
+                 'destination_type': 'volume',
+                 'connection_info': "{'fake': 'connection_info'}",
+                 'snapshot_id': 'fake-snapshot-id-1',
+                 'volume_id': 'fake-volume-id-2',
+                 'boot_index': -1}),
+            BDM({'id': 5, 'instance_uuid': 'fake-instance',
+                 'no_device': True,
+                 'device_name': '/dev/vdc'}),
+        ]
+
     def test_properties(self):
         root_device0 = '/dev/sda'
         root_device1 = '/dev/sdb'
@@ -142,6 +182,19 @@ class BlockDeviceTestCase(test.NoDBTestCase):
         self.assertIsNone(block_device.get_root_bdm(bdms[3:]))
         self.assertIsNone(block_device.get_root_bdm([]))
 
+    def test_get_bdm_ephemeral_disk_size(self):
+        size = block_device.get_bdm_ephemeral_disk_size(self.new_mapping)
+        self.assertEqual(10, size)
+
+    def test_get_bdm_swap_list(self):
+        swap_list = block_device.get_bdm_swap_list(self.new_mapping)
+        self.assertEqual(1, len(swap_list))
+        self.assertEqual(1, swap_list[0].get('id'))
+
+    def test_get_bdm_local_disk_num(self):
+        size = block_device.get_bdm_local_disk_num(self.new_mapping)
+        self.assertEqual(2, size)
+
 
 class TestBlockDeviceDict(test.NoDBTestCase):
     def setUp(self):