1 files changed, 161 insertions, 0 deletions
diff --git a/src/librbd/cache/ParentCacheObjectDispatch.h b/src/librbd/cache/ParentCacheObjectDispatch.h
new file mode 100644
index 000000000..caf782244
--- /dev/null
+++ b/src/librbd/cache/ParentCacheObjectDispatch.h
@@ -0,0 +1,161 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_CACHE_PARENT_CACHER_OBJECT_DISPATCH_H
+#define CEPH_LIBRBD_CACHE_PARENT_CACHER_OBJECT_DISPATCH_H
+
+#include "librbd/io/ObjectDispatchInterface.h"
+#include "common/ceph_mutex.h"
+#include "librbd/cache/TypeTraits.h"
+#include "tools/immutable_object_cache/CacheClient.h"
+#include "tools/immutable_object_cache/Types.h"
+
+namespace librbd {
+
+class ImageCtx;
+
+namespace plugin { template <typename> struct Api; }
+
+namespace cache {
+
+template <typename ImageCtxT = ImageCtx>
+class ParentCacheObjectDispatch : public io::ObjectDispatchInterface {
+  // mock unit testing support
+  typedef cache::TypeTraits<ImageCtxT> TypeTraits;
+  typedef typename TypeTraits::CacheClient CacheClient;
+
+public:
+  static ParentCacheObjectDispatch* create(ImageCtxT* image_ctx,
+                                           plugin::Api<ImageCtxT>& plugin_api) {
+    return new ParentCacheObjectDispatch(image_ctx, plugin_api);
+  }
+
+  ParentCacheObjectDispatch(ImageCtxT* image_ctx,
+                            plugin::Api<ImageCtxT>& plugin_api);
+  ~ParentCacheObjectDispatch() override;
+
+  io::ObjectDispatchLayer get_dispatch_layer() const override {
+    return io::OBJECT_DISPATCH_LAYER_PARENT_CACHE;
+  }
+
+  void init(Context* on_finish = nullptr);
+  void shut_down(Context* on_finish) {
+    m_image_ctx->op_work_queue->queue(on_finish, 0);
+  }
+
+  bool read(
+      uint64_t object_no, io::ReadExtents* extents, IOContext io_context,
+      int op_flags, int read_flags, const ZTracer::Trace &parent_trace,
+      uint64_t* version, int* object_dispatch_flags,
+      io::DispatchResult* dispatch_result, Context** on_finish,
+      Context* on_dispatched) override;
+
+  bool discard(
+      uint64_t object_no, uint64_t object_off, uint64_t object_len,
+      IOContext io_context, int discard_flags,
+      const ZTracer::Trace &parent_trace, int* object_dispatch_flags,
+      uint64_t* journal_tid, io::DispatchResult* dispatch_result,
+      Context** on_finish, Context* on_dispatched) {
+    return false;
+  }
+
+  bool write(
+      uint64_t object_no, uint64_t object_off, ceph::bufferlist&& data,
+      IOContext io_context, int op_flags, int write_flags,
+      std::optional<uint64_t> assert_version,
+      const ZTracer::Trace &parent_trace, int* object_dispatch_flags,
+      uint64_t* journal_tid, io::DispatchResult* dispatch_result,
+      Context** on_finish, Context* on_dispatched) {
+    return false;
+  }
+
+  bool write_same(
+      uint64_t object_no, uint64_t object_off, uint64_t object_len,
+      io::LightweightBufferExtents&& buffer_extents, ceph::bufferlist&& data,
+      IOContext io_context, int op_flags,
+      const ZTracer::Trace &parent_trace, int* object_dispatch_flags,
+      uint64_t* journal_tid, io::DispatchResult* dispatch_result,
+      Context** on_finish, Context* on_dispatched) {
+    return false;
+  }
+
+  bool compare_and_write(
+      uint64_t object_no, uint64_t object_off, ceph::bufferlist&& cmp_data,
+      ceph::bufferlist&& write_data, IOContext io_context, int op_flags,
+      const ZTracer::Trace &parent_trace, uint64_t* mismatch_offset,
+      int* object_dispatch_flags, uint64_t* journal_tid,
+      io::DispatchResult* dispatch_result, Context** on_finish,
+      Context* on_dispatched) {
+    return false;
+  }
+
+  bool flush(
+      io::FlushSource flush_source, const ZTracer::Trace &parent_trace,
+      uint64_t* journal_id, io::DispatchResult* dispatch_result,
+      Context** on_finish, Context* on_dispatched) {
+    return false;
+  }
+
+  bool list_snaps(
+      uint64_t object_no, io::Extents&& extents, io::SnapIds&& snap_ids,
+      int list_snap_flags, const ZTracer::Trace &parent_trace,
+      io::SnapshotDelta* snapshot_delta, int* object_dispatch_flags,
+      io::DispatchResult* dispatch_result, Context** on_finish,
+      Context* on_dispatched) override {
+    return false;
+  }
+
+  bool invalidate_cache(Context* on_finish) {
+    return false;
+  }
+
+  bool reset_existence_cache(Context* on_finish) {
+    return false;
+  }
+
+  void extent_overwritten(
+      uint64_t object_no, uint64_t object_off, uint64_t object_len,
+      uint64_t journal_tid, uint64_t new_journal_tid) {
+  }
+
+  int prepare_copyup(
+      uint64_t object_no,
+      io::SnapshotSparseBufferlist* snapshot_sparse_bufferlist) override {
+    return 0;
+  }
+
+  ImageCtxT* get_image_ctx() {
+    return m_image_ctx;
+  }
+
+  CacheClient* get_cache_client() {
+    return m_cache_client;
+  }
+
+private:
+
+  int read_object(std::string file_path, ceph::bufferlist* read_data,
+                  uint64_t offset, uint64_t length, Context *on_finish);
+  void handle_read_cache(ceph::immutable_obj_cache::ObjectCacheRequest* ack,
+                         uint64_t object_no, io::ReadExtents* extents,
+                         IOContext io_context, int read_flags,
+                         const ZTracer::Trace &parent_trace,
+                         io::DispatchResult* dispatch_result,
+                         Context* on_dispatched);
+  int handle_register_client(bool reg);
+  void create_cache_session(Context* on_finish, bool is_reconnect);
+
+  ImageCtxT* m_image_ctx;
+  plugin::Api<ImageCtxT>& m_plugin_api;
+
+  ceph::mutex m_lock;
+  CacheClient *m_cache_client = nullptr;
+  bool m_connecting = false;
+};
+
+} // namespace cache
+} // namespace librbd
+
+extern template class librbd::cache::ParentCacheObjectDispatch<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_CACHE_PARENT_CACHER_OBJECT_DISPATCH_H