Snapshot reservation sync calls wrong resource.

The snapshot reservations code isn't calling the
correct resource on sync (it's calling volumes).  There's
also some problems with the logic being used on the delete/clean up
that are fixed here as well.

Fixes bug: 1157506
Fixes bug: 1157982

Change-Id: I91327b8043ab63aa35ea8a91b6de544bf5bf6c61

cinder/db/api.py

@@ -314,7 +314,7 @@ def snapshot_data_get_for_project(context, project_id, session=None):
     """Get count and gigabytes used for snapshots for specified project."""
     return IMPL.snapshot_data_get_for_project(context,
                                               project_id,
-                                              session=None)
+                                              session)
 
 
 def snapshot_get_active_by_window(context, begin, end=None, project_id=None):

cinder/flags.py

@@ -238,6 +238,9 @@ def _get_my_ip():
                 default=None,
                 help='A list of backend names to use. These backend names '
                      'should be backed by a unique [CONFIG] group '
-                     'with its options'), ]
+                     'with its options'),
+    cfg.BoolOpt('no_snapshot_gb_quota',
+                default=False,
+                help='Whether snapshots count against GigaByte quota'), ]
 
 FLAGS.register_opts(global_opts)

cinder/quota.py

@@ -738,9 +738,9 @@ def _sync_volumes(context, project_id, session):
 
 def _sync_snapshots(context, project_id, session):
     return dict(zip(('snapshots', 'gigabytes'),
-                db.volume_data_get_for_project(context,
-                                               project_id,
-                                               session=session)))
+                db.snapshot_data_get_for_project(context,
+                                                 project_id,
+                                                 session=session)))
 
 
 QUOTAS = QuotaEngine()

cinder/tests/test_quota.py

@@ -68,13 +68,14 @@ def _create_volume(self, size=10):
         vol['user_id'] = self.user_id
         vol['project_id'] = self.project_id
         vol['size'] = size
-        return db.volume_create(self.context, vol)['id']
+        vol['status'] = 'available'
+        return db.volume_create(self.context, vol)
 
     def test_too_many_volumes(self):
         volume_ids = []
         for i in range(FLAGS.quota_volumes):
-            volume_id = self._create_volume()
-            volume_ids.append(volume_id)
+            vol_ref = self._create_volume()
+            volume_ids.append(vol_ref['id'])
         self.assertRaises(exception.QuotaError,
                           volume.API().create,
                           self.context, 10, '', '', None)
@@ -83,8 +84,8 @@ def test_too_many_volumes(self):
 
     def test_too_many_gigabytes(self):
         volume_ids = []
-        volume_id = self._create_volume(size=20)
-        volume_ids.append(volume_id)
+        vol_ref = self._create_volume(size=20)
+        volume_ids.append(vol_ref['id'])
         self.assertRaises(exception.QuotaError,
                           volume.API().create,
                           self.context, 10, '', '', None)

cinder/volume/api.py

@@ -491,8 +491,11 @@ def _create_snapshot(self, context,
             raise exception.InvalidVolume(reason=msg)
 
         try:
-            reservations = QUOTAS.reserve(context, snapshots=1,
-                                          gigabytes=volume['size'])
+            if FLAGS.no_snapshot_gb_quota:
+                reservations = QUOTAS.reserve(context, snapshots=1)
+            else:
+                reservations = QUOTAS.reserve(context, snapshots=1,
+                                              gigabytes=volume['size'])
         except exception.OverQuota as e:
             overs = e.kwargs['overs']
             usages = e.kwargs['usages']

cinder/volume/manager.py

@@ -489,9 +489,25 @@ def delete_snapshot(self, context, snapshot_id):
                                         snapshot_ref['id'],
                                         {'status': 'error_deleting'})
 
+        # Get reservations
+        try:
+            if CONF.no_snapshot_gb_quota:
+                reservations = QUOTAS.reserve(context, snapshots=-1)
+            else:
+                reservations = QUOTAS.reserve(
+                    context,
+                    snapshots=-1,
+                    gigabytes=-snapshot_ref['volume_size'])
+        except Exception:
+            reservations = None
+            LOG.exception(_("Failed to update usages deleting snapshot"))
         self.db.volume_glance_metadata_delete_by_snapshot(context, snapshot_id)
         self.db.snapshot_destroy(context, snapshot_id)
         LOG.info(_("snapshot %s: deleted successfully"), snapshot_ref['name'])
+
+        # Commit the reservations
+        if reservations:
+            QUOTAS.commit(context, reservations)
         return True
 
     def attach_volume(self, context, volume_id, instance_uuid, mountpoint):

etc/cinder/cinder.conf.sample

@@ -44,6 +44,8 @@
 # syslog facility to receive log lines (string value)
 #syslog_log_facility=LOG_USER
 
+# Do not count snapshots against gigabytes quota (bool value)
+#no_snapshot_gb_quota=False
 
 #
 # Options defined in cinder.exception
@@ -1168,4 +1170,4 @@
 #volume_driver=cinder.volume.driver.FakeISCSIDriver
 
 
-# Total option count: 254
+# Total option count: 255