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diff --git a/src/ceph/src/librbd/mirroring_watcher/Types.cc b/src/ceph/src/librbd/mirroring_watcher/Types.cc
new file mode 100644
index 0000000..dd0dc1d
--- /dev/null
+++ b/src/ceph/src/librbd/mirroring_watcher/Types.cc
@@ -0,0 +1,132 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "common/Formatter.h"
+#include "include/assert.h"
+#include "include/stringify.h"
+#include "librbd/mirroring_watcher/Types.h"
+#include "librbd/watcher/Utils.h"
+
+namespace librbd {
+namespace mirroring_watcher {
+
+namespace {
+
+class DumpPayloadVisitor : public boost::static_visitor<void> {
+public:
+  explicit DumpPayloadVisitor(Formatter *formatter) : m_formatter(formatter) {}
+
+  template <typename Payload>
+  inline void operator()(const Payload &payload) const {
+    NotifyOp notify_op = Payload::NOTIFY_OP;
+    m_formatter->dump_string("notify_op", stringify(notify_op));
+    payload.dump(m_formatter);
+  }
+
+private:
+  ceph::Formatter *m_formatter;
+};
+
+} // anonymous namespace
+
+void ModeUpdatedPayload::encode(bufferlist &bl) const {
+  ::encode(static_cast<uint32_t>(mirror_mode), bl);
+}
+
+void ModeUpdatedPayload::decode(__u8 version, bufferlist::iterator &iter) {
+  uint32_t mirror_mode_decode;
+  ::decode(mirror_mode_decode, iter);
+  mirror_mode = static_cast<cls::rbd::MirrorMode>(mirror_mode_decode);
+}
+
+void ModeUpdatedPayload::dump(Formatter *f) const {
+  f->dump_stream("mirror_mode") << mirror_mode;
+}
+
+void ImageUpdatedPayload::encode(bufferlist &bl) const {
+  ::encode(static_cast<uint32_t>(mirror_image_state), bl);
+  ::encode(image_id, bl);
+  ::encode(global_image_id, bl);
+}
+
+void ImageUpdatedPayload::decode(__u8 version, bufferlist::iterator &iter) {
+  uint32_t mirror_image_state_decode;
+  ::decode(mirror_image_state_decode, iter);
+  mirror_image_state = static_cast<cls::rbd::MirrorImageState>(
+    mirror_image_state_decode);
+  ::decode(image_id, iter);
+  ::decode(global_image_id, iter);
+}
+
+void ImageUpdatedPayload::dump(Formatter *f) const {
+  f->dump_stream("mirror_image_state") << mirror_image_state;
+  f->dump_string("image_id", image_id);
+  f->dump_string("global_image_id", global_image_id);
+}
+
+void UnknownPayload::encode(bufferlist &bl) const {
+  assert(false);
+}
+
+void UnknownPayload::decode(__u8 version, bufferlist::iterator &iter) {
+}
+
+void UnknownPayload::dump(Formatter *f) const {
+}
+
+void NotifyMessage::encode(bufferlist& bl) const {
+  ENCODE_START(1, 1, bl);
+  boost::apply_visitor(watcher::util::EncodePayloadVisitor(bl), payload);
+  ENCODE_FINISH(bl);
+}
+
+void NotifyMessage::decode(bufferlist::iterator& iter) {
+  DECODE_START(1, iter);
+
+  uint32_t notify_op;
+  ::decode(notify_op, iter);
+
+  // select the correct payload variant based upon the encoded op
+  switch (notify_op) {
+  case NOTIFY_OP_MODE_UPDATED:
+    payload = ModeUpdatedPayload();
+    break;
+  case NOTIFY_OP_IMAGE_UPDATED:
+    payload = ImageUpdatedPayload();
+    break;
+  default:
+    payload = UnknownPayload();
+    break;
+  }
+
+  apply_visitor(watcher::util::DecodePayloadVisitor(struct_v, iter), payload);
+  DECODE_FINISH(iter);
+}
+
+void NotifyMessage::dump(Formatter *f) const {
+  apply_visitor(DumpPayloadVisitor(f), payload);
+}
+
+void NotifyMessage::generate_test_instances(std::list<NotifyMessage *> &o) {
+  o.push_back(new NotifyMessage(ModeUpdatedPayload(cls::rbd::MIRROR_MODE_DISABLED)));
+  o.push_back(new NotifyMessage(ImageUpdatedPayload(cls::rbd::MIRROR_IMAGE_STATE_DISABLING,
+                                                    "image id", "global image id")));
+}
+
+std::ostream &operator<<(std::ostream &out, const NotifyOp &op) {
+  switch (op) {
+  case NOTIFY_OP_MODE_UPDATED:
+    out << "ModeUpdated";
+    break;
+  case NOTIFY_OP_IMAGE_UPDATED:
+    out << "ImageUpdated";
+    break;
+  default:
+    out << "Unknown (" << static_cast<uint32_t>(op) << ")";
+    break;
+  }
+  return out;
+}
+
+} // namespace mirroring_watcher
+} // namespace librbd