1 files changed, 67 insertions, 0 deletions
diff --git a/src/librbd/migration/NBDStream.h b/src/librbd/migration/NBDStream.h
new file mode 100644
index 00000000000..aeced5d4f3d
--- /dev/null
+++ b/src/librbd/migration/NBDStream.h
@@ -0,0 +1,67 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_MIGRATION_NBD_STREAM_H
+#define CEPH_LIBRBD_MIGRATION_NBD_STREAM_H
+
+#include "include/int_types.h"
+#include "librbd/migration/StreamInterface.h"
+#include <json_spirit/json_spirit.h>
+#include <boost/asio/io_context.hpp>
+#include <boost/asio/strand.hpp>
+
+struct Context;
+
+namespace librbd {
+
+struct AsioEngine;
+struct ImageCtx;
+
+namespace migration {
+
+template <typename> class NBDClient;
+
+template <typename ImageCtxT>
+class NBDStream : public StreamInterface {
+public:
+  static NBDStream* create(ImageCtxT* image_ctx,
+                           const json_spirit::mObject& json_object) {
+    return new NBDStream(image_ctx, json_object);
+  }
+
+  NBDStream(ImageCtxT* image_ctx, const json_spirit::mObject& json_object);
+  ~NBDStream() override;
+
+  NBDStream(const NBDStream&) = delete;
+  NBDStream& operator=(const NBDStream&) = delete;
+
+  void open(Context* on_finish) override;
+  void close(Context* on_finish) override;
+
+  void get_size(uint64_t* size, Context* on_finish) override;
+
+  void read(io::Extents&& byte_extents, bufferlist* data,
+            Context* on_finish) override;
+
+  void list_sparse_extents(io::Extents&& byte_extents,
+                           io::SparseExtents* sparse_extents,
+                           Context* on_finish) override;
+
+private:
+  CephContext* m_cct;
+  std::shared_ptr<AsioEngine> m_asio_engine;
+  json_spirit::mObject m_json_object;
+  boost::asio::strand<boost::asio::io_context::executor_type> m_strand;
+
+  std::unique_ptr<NBDClient<ImageCtxT>> m_nbd_client;
+
+  struct ReadRequest;
+  struct ListSparseExtentsRequest;
+};
+
+} // namespace migration
+} // namespace librbd
+
+extern template class librbd::migration::NBDStream<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_MIGRATION_NBD_STREAM_H