1 files changed, 47 insertions, 0 deletions
diff --git a/src/librbd/ConfigWatcher.h b/src/librbd/ConfigWatcher.h
new file mode 100644
index 000000000..1f10c8cb8
--- /dev/null
+++ b/src/librbd/ConfigWatcher.h
@@ -0,0 +1,47 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_CONFIG_WATCHER_H
+#define CEPH_LIBRBD_CONFIG_WATCHER_H
+
+#include <set>
+#include <string>
+
+struct Context;
+
+namespace librbd {
+
+struct ImageCtx;
+
+template <typename ImageCtxT>
+class ConfigWatcher {
+public:
+  static ConfigWatcher* create(ImageCtxT& image_ctx) {
+    return new ConfigWatcher(image_ctx);
+  }
+
+  ConfigWatcher(ImageCtxT& image_ctx);
+  ~ConfigWatcher();
+
+  ConfigWatcher(const ConfigWatcher&) = delete;
+  ConfigWatcher& operator=(const ConfigWatcher&) = delete;
+
+  void init();
+  void shut_down();
+
+private:
+  struct Observer;
+
+  ImageCtxT& m_image_ctx;
+
+  Observer* m_observer = nullptr;
+
+  void handle_global_config_change(std::set<std::string> changed);
+
+};
+
+} // namespace librbd
+
+extern template class librbd::ConfigWatcher<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_CONFIG_WATCHER_H