Description of problem:

Running automation tests from tempest  .
we see failures in lvm and glusterfs backend

tests steps :
#1 we create volume
#2 create instance from image
#3 attach volume to instance
#4 create snapshot from instance
#5 delete the snapshot - FAILS
def test_snapshot_create_with_volume_in_use(self):
        # Create a snapshot when volume status is in-use
        # Create a test instance
        server_name = data_utils.rand_name('instance-')
        resp, server = self.servers_client.create_server(server_name,
                                                         self.image_ref,
                                                         self.flavor_ref)
        self.addCleanup(self.servers_client.delete_server, server['id'])
        self.servers_client.wait_for_server_status(server['id'], 'ACTIVE')
        mountpoint = '/dev/%s' % CONF.compute.volume_device_name
        resp, body = self.volumes_client.attach_volume(
            self.volume_origin['id'], server['id'], mountpoint)
        self.assertEqual(202, resp.status)
        self.volumes_client.wait_for_volume_status(self.volume_origin['id'],
                                                   'in-use')
        self.addCleanup(self._detach, self.volume_origin['id'])
        # Snapshot a volume even if it's attached to an instance
        snapshot = self.create_snapshot(self.volume_origin['id'],
                                        force=True)
        # Delete the snapshot
        self.snapshots_client.delete_snapshot(snapshot['id'])
        self.assertEqual(202, resp.status)
        self.snapshots_client.wait_for_resource_deletion(snapshot['id'])
        self.snapshots.remove(snapshot)





Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
#1 we create volume
#2 create instance from image
#3 attach volume to instance
#4 create snapshot from instance
#5 delete the snapshot - FAILS

Actual results:


Expected results:
the snapshot should be deleted


Additional info: