1 files changed, 92 insertions, 0 deletions
diff --git a/src/librbd/io/ImageDispatchInterface.h b/src/librbd/io/ImageDispatchInterface.h
new file mode 100644
index 000000000..64cea8612
--- /dev/null
+++ b/src/librbd/io/ImageDispatchInterface.h
@@ -0,0 +1,92 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_IO_IMAGE_DISPATCH_INTERFACE_H
+#define CEPH_LIBRBD_IO_IMAGE_DISPATCH_INTERFACE_H
+
+#include "include/int_types.h"
+#include "include/buffer.h"
+#include "common/zipkin_trace.h"
+#include "librbd/Types.h"
+#include "librbd/io/ReadResult.h"
+#include "librbd/io/Types.h"
+#include <atomic>
+
+struct Context;
+
+namespace librbd {
+namespace io {
+
+struct AioCompletion;
+struct ImageDispatchSpec;
+
+struct ImageDispatchInterface {
+  typedef ImageDispatchLayer DispatchLayer;
+  typedef ImageDispatchSpec DispatchSpec;
+
+  virtual ~ImageDispatchInterface() {
+  }
+
+  virtual ImageDispatchLayer get_dispatch_layer() const = 0;
+
+  virtual void shut_down(Context* on_finish) = 0;
+
+  virtual bool read(
+      AioCompletion* aio_comp, Extents &&image_extents,
+      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,
+      DispatchResult* dispatch_result, Context** on_finish,
+      Context* on_dispatched) = 0;
+  virtual bool write(
+      AioCompletion* aio_comp, Extents &&image_extents, bufferlist &&bl,
+      IOContext io_context, int op_flags, const ZTracer::Trace &parent_trace,
+      uint64_t tid, std::atomic<uint32_t>* image_dispatch_flags,
+      DispatchResult* dispatch_result, Context** on_finish,
+      Context* on_dispatched) = 0;
+  virtual bool discard(
+      AioCompletion* aio_comp, Extents &&image_extents,
+      uint32_t discard_granularity_bytes,
+      IOContext io_context, const ZTracer::Trace &parent_trace, uint64_t tid,
+      std::atomic<uint32_t>* image_dispatch_flags,
+      DispatchResult* dispatch_result, Context** on_finish,
+      Context* on_dispatched) = 0;
+  virtual bool write_same(
+      AioCompletion* aio_comp, Extents &&image_extents, bufferlist &&bl,
+      IOContext io_context, int op_flags, const ZTracer::Trace &parent_trace,
+      uint64_t tid, std::atomic<uint32_t>* image_dispatch_flags,
+      DispatchResult* dispatch_result, Context** on_finish,
+      Context* on_dispatched) = 0;
+  virtual bool compare_and_write(
+      AioCompletion* aio_comp, Extents &&image_extents, bufferlist &&cmp_bl,
+      bufferlist &&bl, uint64_t *mismatch_offset, IOContext io_context,
+      int op_flags, const ZTracer::Trace &parent_trace, uint64_t tid,
+      std::atomic<uint32_t>* image_dispatch_flags,
+      DispatchResult* dispatch_result, Context** on_finish,
+      Context* on_dispatched) = 0;
+  virtual bool flush(
+      AioCompletion* aio_comp, FlushSource flush_source,
+      const ZTracer::Trace &parent_trace, uint64_t tid,
+      std::atomic<uint32_t>* image_dispatch_flags,
+      DispatchResult* dispatch_result, Context** on_finish,
+      Context* on_dispatched) = 0;
+
+  virtual bool list_snaps(
+      AioCompletion* aio_comp, Extents&& image_extents, SnapIds&& snap_ids,
+      int list_snaps_flags, SnapshotDelta* snapshot_delta,
+      const ZTracer::Trace &parent_trace, uint64_t tid,
+      std::atomic<uint32_t>* image_dispatch_flags,
+      DispatchResult* dispatch_result, Context** on_finish,
+      Context* on_dispatched) = 0;
+
+  virtual bool invalidate_cache(Context* on_finish) = 0;
+  
+  virtual void remap_extents(Extents& image_extents,
+                             ImageExtentsMapType type) {}
+
+};
+
+} // namespace io
+} // namespace librbd
+
+#endif // CEPH_LIBRBD_IO_IMAGE_DISPATCH_INTERFACE_H