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diff --git a/src/ceph/src/rbd_replay/ios.cc b/src/ceph/src/rbd_replay/ios.cc
new file mode 100644
index 0000000..db8470e
--- /dev/null
+++ b/src/ceph/src/rbd_replay/ios.cc
@@ -0,0 +1,208 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2014 Adam Crume <adamcrume@gmail.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+// This code assumes that IO IDs and timestamps are related monotonically.
+// In other words, (a.id < b.id) == (a.timestamp < b.timestamp) for all IOs a and b.
+
+#include "ios.hpp"
+#include "rbd_replay/ActionTypes.h"
+
+using namespace std;
+using namespace rbd_replay;
+
+namespace {
+
+bool compare_dependencies_by_start_time(const action::Dependency &lhs,
+                                        const action::Dependency &rhs) {
+  return lhs.time_delta < rhs.time_delta;
+}
+
+action::Dependencies convert_dependencies(uint64_t start_time,
+                                          const io_set_t &deps) {
+  action::Dependencies action_deps;
+  action_deps.reserve(deps.size());
+  for (io_set_t::const_iterator it = deps.begin(); it != deps.end(); ++it) {
+    boost::shared_ptr<IO> io = *it;
+    uint64_t time_delta = 0;
+    if (start_time >= io->start_time()) {
+      time_delta = start_time - io->start_time();
+    }
+    action_deps.push_back(action::Dependency(io->ionum(), time_delta));
+  }
+  std::sort(action_deps.begin(), action_deps.end(),
+            compare_dependencies_by_start_time);
+  return action_deps;
+}
+
+} // anonymous namespace
+
+void IO::write_debug_base(ostream& out, string type) const {
+  out << m_ionum << ": " << m_start_time / 1000000.0 << ": " << type << ", thread = " << m_thread_id << ", deps = {";
+  bool first = true;
+  for (io_set_t::iterator itr = m_dependencies.begin(), end = m_dependencies.end(); itr != end; ++itr) {
+    if (first) {
+      first = false;
+    } else {
+      out << ", ";
+    }
+    out << (*itr)->m_ionum << ": " << m_start_time - (*itr)->m_start_time;
+  }
+  out << "}";
+}
+
+
+ostream& operator<<(ostream &out, const IO::ptr &io) {
+  io->write_debug(out);
+  return out;
+}
+
+void StartThreadIO::encode(bufferlist &bl) const {
+  action::Action action((action::StartThreadAction(
+    ionum(), thread_id(), convert_dependencies(start_time(), dependencies()))));
+  ::encode(action, bl);
+}
+
+void StartThreadIO::write_debug(std::ostream& out) const {
+  write_debug_base(out, "start thread");
+}
+
+void StopThreadIO::encode(bufferlist &bl) const {
+  action::Action action((action::StopThreadAction(
+    ionum(), thread_id(), convert_dependencies(start_time(), dependencies()))));
+  ::encode(action, bl);
+}
+
+void StopThreadIO::write_debug(std::ostream& out) const {
+  write_debug_base(out, "stop thread");
+}
+
+void ReadIO::encode(bufferlist &bl) const {
+  action::Action action((action::ReadAction(
+    ionum(), thread_id(), convert_dependencies(start_time(), dependencies()),
+    m_imagectx, m_offset, m_length)));
+  ::encode(action, bl);
+}
+
+void ReadIO::write_debug(std::ostream& out) const {
+  write_debug_base(out, "read");
+  out << ", imagectx=" << m_imagectx << ", offset=" << m_offset << ", length=" << m_length << "]";
+}
+
+void WriteIO::encode(bufferlist &bl) const {
+  action::Action action((action::WriteAction(
+    ionum(), thread_id(), convert_dependencies(start_time(), dependencies()),
+    m_imagectx, m_offset, m_length)));
+  ::encode(action, bl);
+}
+
+void WriteIO::write_debug(std::ostream& out) const {
+  write_debug_base(out, "write");
+  out << ", imagectx=" << m_imagectx << ", offset=" << m_offset << ", length=" << m_length << "]";
+}
+
+void DiscardIO::encode(bufferlist &bl) const {
+  action::Action action((action::DiscardAction(
+    ionum(), thread_id(), convert_dependencies(start_time(), dependencies()),
+    m_imagectx, m_offset, m_length)));
+  ::encode(action, bl);
+}
+
+void DiscardIO::write_debug(std::ostream& out) const {
+  write_debug_base(out, "discard");
+  out << ", imagectx=" << m_imagectx << ", offset=" << m_offset << ", length=" << m_length << "]";
+}
+
+void AioReadIO::encode(bufferlist &bl) const {
+  action::Action action((action::AioReadAction(
+    ionum(), thread_id(), convert_dependencies(start_time(), dependencies()),
+    m_imagectx, m_offset, m_length)));
+  ::encode(action, bl);
+}
+
+void AioReadIO::write_debug(std::ostream& out) const {
+  write_debug_base(out, "aio read");
+  out << ", imagectx=" << m_imagectx << ", offset=" << m_offset << ", length=" << m_length << "]";
+}
+
+void AioWriteIO::encode(bufferlist &bl) const {
+  action::Action action((action::AioWriteAction(
+    ionum(), thread_id(), convert_dependencies(start_time(), dependencies()),
+    m_imagectx, m_offset, m_length)));
+  ::encode(action, bl);
+}
+
+void AioWriteIO::write_debug(std::ostream& out) const {
+  write_debug_base(out, "aio write");
+  out << ", imagectx=" << m_imagectx << ", offset=" << m_offset << ", length=" << m_length << "]";
+}
+
+void AioDiscardIO::encode(bufferlist &bl) const {
+  action::Action action((action::AioDiscardAction(
+    ionum(), thread_id(), convert_dependencies(start_time(), dependencies()),
+    m_imagectx, m_offset, m_length)));
+  ::encode(action, bl);
+}
+
+void AioDiscardIO::write_debug(std::ostream& out) const {
+  write_debug_base(out, "aio discard");
+  out << ", imagectx=" << m_imagectx << ", offset=" << m_offset << ", length=" << m_length << "]";
+}
+
+void OpenImageIO::encode(bufferlist &bl) const {
+  action::Action action((action::OpenImageAction(
+    ionum(), thread_id(), convert_dependencies(start_time(), dependencies()),
+    m_imagectx, m_name, m_snap_name, m_readonly)));
+  ::encode(action, bl);
+}
+
+void OpenImageIO::write_debug(std::ostream& out) const {
+  write_debug_base(out, "open image");
+  out << ", imagectx=" << m_imagectx << ", name='" << m_name << "', snap_name='" << m_snap_name << "', readonly=" << m_readonly;
+}
+
+void CloseImageIO::encode(bufferlist &bl) const {
+  action::Action action((action::CloseImageAction(
+    ionum(), thread_id(), convert_dependencies(start_time(), dependencies()),
+    m_imagectx)));
+  ::encode(action, bl);
+}
+
+void CloseImageIO::write_debug(std::ostream& out) const {
+  write_debug_base(out, "close image");
+  out << ", imagectx=" << m_imagectx;
+}
+
+void AioOpenImageIO::encode(bufferlist &bl) const {
+  action::Action action((action::AioOpenImageAction(
+    ionum(), thread_id(), convert_dependencies(start_time(), dependencies()),
+    m_imagectx, m_name, m_snap_name, m_readonly)));
+  ::encode(action, bl);
+}
+
+void AioOpenImageIO::write_debug(std::ostream& out) const {
+  write_debug_base(out, "aio open image");
+  out << ", imagectx=" << m_imagectx << ", name='" << m_name << "', snap_name='" << m_snap_name << "', readonly=" << m_readonly;
+}
+
+void AioCloseImageIO::encode(bufferlist &bl) const {
+  action::Action action((action::AioCloseImageAction(
+    ionum(), thread_id(), convert_dependencies(start_time(), dependencies()),
+    m_imagectx)));
+  ::encode(action, bl);
+}
+
+void AioCloseImageIO::write_debug(std::ostream& out) const {
+  write_debug_base(out, "aio close image");
+  out << ", imagectx=" << m_imagectx;
+}