1 files changed, 101 insertions, 0 deletions
diff --git a/src/librbd/migration/ImageDispatch.h b/src/librbd/migration/ImageDispatch.h
new file mode 100644
index 000000000..cd96141c0
--- /dev/null
+++ b/src/librbd/migration/ImageDispatch.h
@@ -0,0 +1,101 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_MIGRATION_IMAGE_DISPATCH_H
+#define CEPH_LIBRBD_MIGRATION_IMAGE_DISPATCH_H
+
+#include "librbd/io/ImageDispatchInterface.h"
+#include <memory>
+
+struct Context;
+
+namespace librbd {
+
+struct ImageCtx;
+
+namespace migration {
+
+struct FormatInterface;
+
+template <typename ImageCtxT>
+class ImageDispatch : public io::ImageDispatchInterface {
+public:
+  static ImageDispatch* create(ImageCtxT* image_ctx,
+                               std::unique_ptr<FormatInterface> source) {
+    return new ImageDispatch(image_ctx, std::move(source));
+  }
+
+  ImageDispatch(ImageCtxT* image_ctx, std::unique_ptr<FormatInterface> source);
+
+  void shut_down(Context* on_finish) override;
+
+  io::ImageDispatchLayer get_dispatch_layer() const override {
+    return io::IMAGE_DISPATCH_LAYER_MIGRATION;
+  }
+
+  bool read(
+      io::AioCompletion* aio_comp, io::Extents &&image_extents,
+      io::ReadResult &&read_result, IOContext io_context, int op_flags,
+      int read_flags, const ZTracer::Trace &parent_trace, uint64_t tid,
+      std::atomic<uint32_t>* image_dispatch_flags,
+      io::DispatchResult* dispatch_result, Context** on_finish,
+      Context* on_dispatched) override;
+  bool write(
+      io::AioCompletion* aio_comp, io::Extents &&image_extents, bufferlist &&bl,
+      int op_flags, const ZTracer::Trace &parent_trace,
+      uint64_t tid, std::atomic<uint32_t>* image_dispatch_flags,
+      io::DispatchResult* dispatch_result, Context** on_finish,
+      Context* on_dispatched) override;
+  bool discard(
+      io::AioCompletion* aio_comp, io::Extents &&image_extents,
+      uint32_t discard_granularity_bytes, const ZTracer::Trace &parent_trace,
+      uint64_t tid, std::atomic<uint32_t>* image_dispatch_flags,
+      io::DispatchResult* dispatch_result, Context** on_finish,
+      Context* on_dispatched) override;
+  bool write_same(
+      io::AioCompletion* aio_comp, io::Extents &&image_extents, bufferlist &&bl,
+      int op_flags, const ZTracer::Trace &parent_trace,
+      uint64_t tid, std::atomic<uint32_t>* image_dispatch_flags,
+      io::DispatchResult* dispatch_result, Context** on_finish,
+      Context* on_dispatched) override;
+  bool compare_and_write(
+      io::AioCompletion* aio_comp, io::Extents &&image_extents,
+      bufferlist &&cmp_bl, bufferlist &&bl, uint64_t *mismatch_offset,
+      int op_flags, const ZTracer::Trace &parent_trace,
+      uint64_t tid, std::atomic<uint32_t>* image_dispatch_flags,
+      io::DispatchResult* dispatch_result, Context** on_finish,
+      Context* on_dispatched) override;
+  bool flush(
+      io::AioCompletion* aio_comp, io::FlushSource flush_source,
+      const ZTracer::Trace &parent_trace, uint64_t tid,
+      std::atomic<uint32_t>* image_dispatch_flags,
+      io::DispatchResult* dispatch_result, Context** on_finish,
+      Context* on_dispatched) override;
+
+  bool list_snaps(
+      io::AioCompletion* aio_comp, io::Extents&& image_extents,
+      io::SnapIds&& snap_ids, int list_snaps_flags,
+      io::SnapshotDelta* snapshot_delta, const ZTracer::Trace &parent_trace,
+      uint64_t tid, std::atomic<uint32_t>* image_dispatch_flags,
+      io::DispatchResult* dispatch_result, Context** on_finish,
+      Context* on_dispatched) override;
+
+  bool invalidate_cache(Context* on_finish) override {
+    return false;
+  }
+
+private:
+  ImageCtxT* m_image_ctx;
+  std::unique_ptr<FormatInterface> m_format;
+
+  void fail_io(int r, io::AioCompletion* aio_comp,
+               io::DispatchResult* dispatch_result);
+
+};
+
+} // namespace migration
+} // namespace librbd
+
+extern template class librbd::migration::ImageDispatch<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_MIGRATION_IMAGE_DISPATCH_H