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diff --git a/src/rbd_replay/actions.hpp b/src/rbd_replay/actions.hpp
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+// -*- 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.
+ *
+ */
+
+#ifndef _INCLUDED_RBD_REPLAY_ACTIONS_HPP
+#define _INCLUDED_RBD_REPLAY_ACTIONS_HPP
+
+#include <boost/shared_ptr.hpp>
+#include "include/rbd/librbd.hpp"
+#include "common/Formatter.h"
+#include "rbd_replay/ActionTypes.h"
+#include "rbd_loc.hpp"
+#include <iostream>
+
+// Stupid Doxygen requires this or else the typedef docs don't appear anywhere.
+/// @file rbd_replay/actions.hpp
+
+namespace rbd_replay {
+
+typedef uint64_t imagectx_id_t;
+typedef uint64_t thread_id_t;
+
+/// Even IDs are normal actions, odd IDs are completions.
+typedef uint32_t action_id_t;
+
+class PendingIO;
+
+/**
+   %Context through which an Action interacts with its environment.
+ */
+class ActionCtx {
+public:
+  virtual ~ActionCtx() {
+  }
+
+  /**
+     Returns the image with the given ID.
+     The image must have been previously tracked with put_image(imagectx_id_t,librbd::Image*).
+   */
+  virtual librbd::Image* get_image(imagectx_id_t imagectx_id) = 0;
+
+  /**
+     Tracks an image.
+     put_image(imagectx_id_t,librbd::Image*) must not have been called previously with the same ID,
+     and the image must not be NULL.
+   */
+  virtual void put_image(imagectx_id_t imagectx_id, librbd::Image* image) = 0;
+
+  /**
+     Stops tracking an Image and release it.
+     This deletes the C++ object, not the image itself.
+     The image must have been previously tracked with put_image(imagectx_id_t,librbd::Image*).
+   */
+  virtual void erase_image(imagectx_id_t imagectx_id) = 0;
+
+  virtual librbd::RBD* rbd() = 0;
+
+  virtual librados::IoCtx* ioctx() = 0;
+
+  virtual void add_pending(boost::shared_ptr<PendingIO> io) = 0;
+
+  virtual bool readonly() const = 0;
+
+  virtual void remove_pending(boost::shared_ptr<PendingIO> io) = 0;
+
+  virtual void set_action_complete(action_id_t id) = 0;
+
+  virtual void stop() = 0;
+
+  /**
+     Maps an image name from the name in the original trace to the name that should be used when replaying.
+     @param image_name name of the image in the original trace
+     @param snap_name name of the snap in the original trace
+     @return image name to replay against
+   */
+  virtual rbd_loc map_image_name(std::string image_name, std::string snap_name) const = 0;
+};
+
+
+/**
+   Performs an %IO or a maintenance action such as starting or stopping a thread.
+   Actions are read from a replay file and scheduled by Replayer.
+   Corresponds to the IO class, except that Actions are executed by rbd-replay,
+   and IOs are used by rbd-replay-prep for processing the raw trace.
+ */
+class Action {
+public:
+  typedef boost::shared_ptr<Action> ptr;
+
+  virtual ~Action() {
+  }
+
+  virtual void perform(ActionCtx &ctx) = 0;
+
+  /// Returns the ID of the completion corresponding to this action.
+  action_id_t pending_io_id() {
+    return id() + 1;
+  }
+
+  // There's probably a better way to do this, but oh well.
+  virtual bool is_start_thread() {
+    return false;
+  }
+
+  virtual action_id_t id() const = 0;
+  virtual thread_id_t thread_id() const = 0;
+  virtual const action::Dependencies& predecessors() const = 0;
+
+  virtual std::ostream& dump(std::ostream& o) const = 0;
+
+  static ptr construct(const action::ActionEntry &action_entry);
+};
+
+template <typename ActionType>
+class TypedAction : public Action {
+public:
+  explicit TypedAction(const ActionType &action) : m_action(action) {
+  }
+
+  action_id_t id() const override {
+    return m_action.id;
+  }
+
+  thread_id_t thread_id() const override {
+    return m_action.thread_id;
+  }
+
+  const action::Dependencies& predecessors() const override {
+    return m_action.dependencies;
+  }
+
+  std::ostream& dump(std::ostream& o) const override {
+    o << get_action_name() << ": ";
+    ceph::JSONFormatter formatter(false);
+    formatter.open_object_section("");
+    m_action.dump(&formatter);
+    formatter.close_section();
+    formatter.flush(o);
+    return o;
+  }
+
+protected:
+  const ActionType m_action;
+
+  virtual const char *get_action_name() const = 0;
+};
+
+/// Writes human-readable debug information about the action to the stream.
+/// @related Action
+std::ostream& operator<<(std::ostream& o, const Action& a);
+
+class StartThreadAction : public TypedAction<action::StartThreadAction> {
+public:
+  explicit StartThreadAction(const action::StartThreadAction &action)
+    : TypedAction<action::StartThreadAction>(action) {
+  }
+
+  bool is_start_thread() override {
+    return true;
+  }
+  void perform(ActionCtx &ctx) override;
+
+protected:
+  const char *get_action_name() const override {
+    return "StartThreadAction";
+  }
+};
+
+class StopThreadAction : public TypedAction<action::StopThreadAction> {
+public:
+  explicit StopThreadAction(const action::StopThreadAction &action)
+    : TypedAction<action::StopThreadAction>(action) {
+  }
+
+  void perform(ActionCtx &ctx) override;
+
+protected:
+  const char *get_action_name() const override {
+    return "StartThreadAction";
+  }
+};
+
+
+class AioReadAction : public TypedAction<action::AioReadAction> {
+public:
+  explicit AioReadAction(const action::AioReadAction &action)
+    : TypedAction<action::AioReadAction>(action) {
+  }
+
+  void perform(ActionCtx &ctx) override;
+
+protected:
+  const char *get_action_name() const override {
+    return "AioReadAction";
+  }
+};
+
+
+class ReadAction : public TypedAction<action::ReadAction> {
+public:
+  explicit ReadAction(const action::ReadAction &action)
+    : TypedAction<action::ReadAction>(action) {
+  }
+
+  void perform(ActionCtx &ctx) override;
+
+protected:
+  const char *get_action_name() const override {
+    return "ReadAction";
+  }
+};
+
+
+class AioWriteAction : public TypedAction<action::AioWriteAction> {
+public:
+  explicit AioWriteAction(const action::AioWriteAction &action)
+    : TypedAction<action::AioWriteAction>(action) {
+  }
+
+  void perform(ActionCtx &ctx) override;
+
+protected:
+  const char *get_action_name() const override {
+    return "AioWriteAction";
+  }
+};
+
+
+class WriteAction : public TypedAction<action::WriteAction> {
+public:
+  explicit WriteAction(const action::WriteAction &action)
+    : TypedAction<action::WriteAction>(action) {
+  }
+
+  void perform(ActionCtx &ctx) override;
+
+protected:
+  const char *get_action_name() const override {
+    return "WriteAction";
+  }
+};
+
+
+class AioDiscardAction : public TypedAction<action::AioDiscardAction> {
+public:
+  explicit AioDiscardAction(const action::AioDiscardAction &action)
+    : TypedAction<action::AioDiscardAction>(action) {
+  }
+
+  void perform(ActionCtx &ctx) override;
+
+protected:
+  const char *get_action_name() const override {
+    return "AioDiscardAction";
+  }
+};
+
+
+class DiscardAction : public TypedAction<action::DiscardAction> {
+public:
+  explicit DiscardAction(const action::DiscardAction &action)
+    : TypedAction<action::DiscardAction>(action) {
+  }
+
+  void perform(ActionCtx &ctx) override;
+
+protected:
+  const char *get_action_name() const override {
+    return "DiscardAction";
+  }
+};
+
+
+class OpenImageAction : public TypedAction<action::OpenImageAction> {
+public:
+  explicit OpenImageAction(const action::OpenImageAction &action)
+    : TypedAction<action::OpenImageAction>(action) {
+  }
+
+  void perform(ActionCtx &ctx) override;
+
+protected:
+  const char *get_action_name() const override {
+    return "OpenImageAction";
+  }
+};
+
+
+class CloseImageAction : public TypedAction<action::CloseImageAction> {
+public:
+  explicit CloseImageAction(const action::CloseImageAction &action)
+    : TypedAction<action::CloseImageAction>(action) {
+  }
+
+  void perform(ActionCtx &ctx) override;
+
+protected:
+  const char *get_action_name() const override {
+    return "CloseImageAction";
+  }
+};
+
+class AioOpenImageAction : public TypedAction<action::AioOpenImageAction> {
+public:
+  explicit AioOpenImageAction(const action::AioOpenImageAction &action)
+    : TypedAction<action::AioOpenImageAction>(action) {
+  }
+
+  void perform(ActionCtx &ctx) override;
+
+protected:
+  const char *get_action_name() const override {
+    return "AioOpenImageAction";
+  }
+};
+
+
+class AioCloseImageAction : public TypedAction<action::AioCloseImageAction> {
+public:
+  explicit AioCloseImageAction(const action::AioCloseImageAction &action)
+    : TypedAction<action::AioCloseImageAction>(action) {
+  }
+
+  void perform(ActionCtx &ctx) override;
+
+protected:
+  const char *get_action_name() const override {
+    return "AioCloseImageAction";
+  }
+};
+
+}
+
+#endif