cct->lookup_or_create_singleton_object<ThreadPoolSingleton>(
thread_pool_singleton, "librbd::journal::thread_pool");
m_work_queue = new ContextWQ("librbd::journal::work_queue",
cct->lookup_or_create_singleton_object<ThreadPoolSingleton>(
thread_pool_singleton, "librbd::journal::thread_pool");
m_work_queue = new ContextWQ("librbd::journal::work_queue",