1 files changed, 66 insertions, 0 deletions
diff --git a/src/librbd/object_map/Request.h b/src/librbd/object_map/Request.h
new file mode 100644
index 000000000..7e9bfb88d
--- /dev/null
+++ b/src/librbd/object_map/Request.h
@@ -0,0 +1,66 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_OBJECT_MAP_REQUEST_H
+#define CEPH_LIBRBD_OBJECT_MAP_REQUEST_H
+
+#include "include/int_types.h"
+#include "librbd/AsyncRequest.h"
+
+class Context;
+
+namespace librbd {
+
+class ImageCtx;
+
+namespace object_map {
+
+class Request : public AsyncRequest<> {
+public:
+  Request(ImageCtx &image_ctx, uint64_t snap_id, Context *on_finish)
+    : AsyncRequest(image_ctx, on_finish), m_snap_id(snap_id),
+      m_state(STATE_REQUEST)
+  {
+  }
+
+  void send() override = 0;
+
+protected:
+  const uint64_t m_snap_id;
+
+  bool should_complete(int r) override;
+  int filter_return_code(int r) const override {
+    if (m_state == STATE_REQUEST) {
+      // never propagate an error back to the caller
+      return 0;
+    }
+    return r;
+  }
+  virtual void finish_request() {
+  }
+
+private:
+  /**
+   *              STATE_TIMEOUT --------\
+   *                   ^                |
+   *                   |                v
+   * <start> ---> STATE_REQUEST ---> <finish>
+   *                   |                ^
+   *                   v                |
+   *            STATE_INVALIDATE -------/
+   */
+  enum State {
+    STATE_REQUEST,
+    STATE_TIMEOUT,
+    STATE_INVALIDATE
+  };
+
+  State m_state;
+
+  bool invalidate();
+};
+
+} // namespace object_map
+} // namespace librbd
+
+#endif // CEPH_LIBRBD_OBJECT_MAP_REQUEST_H