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diff --git a/src/ceph/src/tools/rbd_mirror/Threads.h b/src/ceph/src/tools/rbd_mirror/Threads.h
new file mode 100644
index 0000000..f52e883
--- /dev/null
+++ b/src/ceph/src/tools/rbd_mirror/Threads.h
@@ -0,0 +1,39 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_RBD_MIRROR_THREADS_H
+#define CEPH_RBD_MIRROR_THREADS_H
+
+#include "common/Mutex.h"
+
+class CephContext;
+class ContextWQ;
+class SafeTimer;
+class ThreadPool;
+
+namespace librbd { struct ImageCtx; }
+
+namespace rbd {
+namespace mirror {
+
+template <typename ImageCtxT = librbd::ImageCtx>
+struct Threads {
+  ThreadPool *thread_pool = nullptr;
+  ContextWQ *work_queue = nullptr;
+
+  SafeTimer *timer = nullptr;
+  Mutex timer_lock;
+
+  explicit Threads(CephContext *cct);
+  Threads(const Threads&) = delete;
+  Threads& operator=(const Threads&) = delete;
+
+  ~Threads();
+};
+
+} // namespace mirror
+} // namespace rbd
+
+extern template class rbd::mirror::Threads<librbd::ImageCtx>;
+
+#endif // CEPH_RBD_MIRROR_THREADS_H