Function preload

src/extblkdev/ExtBlkDevPlugin.cc:185–233

preload set of extblkdev plugins defined in config

    // preload set of extblkdev plugins defined in config
    int preload(CephContext *cct)
    {
      static bool preload_executed = false;
      static int preload_result = -1;
      if (preload_executed) {
        auto registry = cct->get_plugin_registry();
        std::lock_guard l(registry->lock);
        dout(10) << "plugins preload done, extblkdev plugins ="
          << registry->plugins["extblkdev"].size()
          << " previous_result = " << preload_result << dendl;
        return preload_result;
      }
      preload_executed = true;
      const auto& conf = cct->_conf;
      string plugins = conf.get_val<std::string>("osd_extblkdev_plugins");
      dout(10) << "starting preload of extblkdev plugins: " << plugins << dendl;

      list<string> plugins_list;
      get_str_list(plugins, plugins_list);

      auto registry = cct->get_plugin_registry();
      {
	std::lock_guard l(registry->lock);
	for (auto& plg : plugins_list) {
	  dout(10) << "starting load of extblkdev plugin: " << plg << dendl;
	  int rc = registry->load("extblkdev", std::string("ebd_") + plg);
	  if (rc) {
	    derr << __func__ << " failed preloading extblkdev plugin: " << plg << dendl;
            preload_result = rc;
	    return rc;
	  } else {
	    dout(10) << "successful load of extblkdev plugin: " << plg << dendl;
	  }
	}
      }
#ifdef __linux__
      // if we are still running as root, we do not need to trim capabilities
      // as we are intended to use the privileges
      if (geteuid() == 0) {
        preload_result = 0;
	return 0;
      }
      preload_result = limit_caps(cct);
      return preload_result;
#else
      preload_result = 0;
      return 0;
#endif
    }


    // scan extblkdev plugins for support of this device