Add 'detaching' to volume status

Fixes bug #1004382

When attach a volume , the volume status is "available -> attaching ->
in-use", But when detaching a volume , the volume status is "in-use ->
available". So We need 'detaching' volume status, it make the change of
state of the volume more clearly.

Change-Id: Idf8c38413135bf8e8cd025f11937f8c7250557c1

cinder/api/openstack/volume/contrib/volume_actions.py

@@ -110,6 +110,22 @@ def _unreserve(self, req, id, body):
         self.volume_api.unreserve_volume(context, volume)
         return webob.Response(status_int=202)
 
+    @wsgi.action('os-begin_detaching')
+    def _begin_detaching(self, req, id, body):
+        """Update volume status to 'detaching'."""
+        context = req.environ['cinder.context']
+        volume = self.volume_api.get(context, id)
+        self.volume_api.begin_detaching(context, volume)
+        return webob.Response(status_int=202)
+
+    @wsgi.action('os-roll_detaching')
+    def _roll_detaching(self, req, id, body):
+        """Roll back volume status to 'in-use'."""
+        context = req.environ['cinder.context']
+        volume = self.volume_api.get(context, id)
+        self.volume_api.roll_detaching(context, volume)
+        return webob.Response(status_int=202)
+
     @wsgi.action('os-initialize_connection')
     def _initialize_connection(self, req, id, body):
         """Initialize volume attachment."""

cinder/tests/policy.json

@@ -11,6 +11,8 @@
     "volume:detach": [],
     "volume:reserve_volume": [],
     "volume:unreserve_volume": [],
+    "volume:begin_detaching": [],
+    "volume:roll_detaching": [],
     "volume:check_attach": [],
     "volume:check_detach": [],
     "volume:initialize_connection": [],

cinder/tests/test_volume.py

@@ -614,6 +614,17 @@ def test_create_volume_usage_notification(self):
         self.assertTrue('created_at' in payload)
         self.volume.delete_volume(self.context, volume_id)
 
+    def test_begin_roll_detaching_volume(self):
+        """Test begin_detaching and roll_detaching functions."""
+        volume = self._create_volume()
+        volume_api = cinder.volume.api.API()
+        volume_api.begin_detaching(self.context, volume)
+        volume = db.volume_get(self.context, volume['id'])
+        self.assertEqual(volume['status'], "detaching")
+        volume_api.roll_detaching(self.context, volume)
+        volume = db.volume_get(self.context, volume['id'])
+        self.assertEqual(volume['status'], "in-use")
+
 
 class DriverTestCase(test.TestCase):
     """Base Test class for Drivers."""

cinder/volume/api.py

@@ -313,6 +313,15 @@ def unreserve_volume(self, context, volume):
         if volume['status'] == "attaching":
             self.update(context, volume, {"status": "available"})
 
+    @wrap_check_policy
+    def begin_detaching(self, context, volume):
+        self.update(context, volume, {"status": "detaching"})
+
+    @wrap_check_policy
+    def roll_detaching(self, context, volume):
+        if volume['status'] == "detaching":
+            self.update(context, volume, {"status": "in-use"})
+
     @wrap_check_policy
     def attach(self, context, volume, instance_uuid, mountpoint):
         host = volume['host']