1 files changed, 53 insertions, 0 deletions
diff --git a/src/tools/cephfs_mirror/aio_utils.h b/src/tools/cephfs_mirror/aio_utils.h
new file mode 100644
index 000000000..43f356381
--- /dev/null
+++ b/src/tools/cephfs_mirror/aio_utils.h
@@ -0,0 +1,53 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPHFS_MIRROR_AIO_UTILS_H
+#define CEPHFS_MIRROR_AIO_UTILS_H
+
+#include "include/rados/librados.hpp"
+
+namespace cephfs {
+namespace mirror {
+
+template <typename T, void(T::*MF)(int)>
+void rados_callback(rados_completion_t c, void *arg) {
+  T *obj = reinterpret_cast<T*>(arg);
+  int r = rados_aio_get_return_value(c);
+  (obj->*MF)(r);
+}
+
+template <typename T, void (T::*MF)(int)>
+class C_CallbackAdapter : public Context {
+  T *obj;
+public:
+  C_CallbackAdapter(T *obj)
+    : obj(obj) {
+  }
+
+protected:
+  void finish(int r) override {
+    (obj->*MF)(r);
+  }
+};
+
+template <typename WQ>
+struct C_AsyncCallback : public Context {
+  WQ *op_work_queue;
+  Context *on_finish;
+
+  C_AsyncCallback(WQ *op_work_queue, Context *on_finish)
+    : op_work_queue(op_work_queue), on_finish(on_finish) {
+  }
+  ~C_AsyncCallback() override {
+    delete on_finish;
+  }
+  void finish(int r) override {
+    op_work_queue->queue(on_finish, r);
+    on_finish = nullptr;
+  }
+};
+
+} // namespace mirror
+} // namespace cephfs
+
+#endif // CEPHFS_MIRROR_AIO_UTILS_H