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diff --git a/src/rbd_replay/rbd_loc.hpp b/src/rbd_replay/rbd_loc.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_RBD_LOC_HPP
+#define _INCLUDED_RBD_REPLAY_RBD_LOC_HPP
+
+#include <string>
+
+namespace rbd_replay {
+
+/**
+   Stores a pool, image name, and snap name triple.
+   rbd_locs can be converted to/from strings with the format pool/image\@snap.
+   The slash and at signs can be omitted if the pool and snap are empty, respectively.
+   Backslashes can be used to escape slashes and at signs in names.
+   Examples:
+
+   |Pool  | Image | Snap | String             |
+   |------|-------|------|--------------------|
+   |rbd   | vm    | 1    | rbd/vm\@1          |
+   |rbd   | vm    |      | rbd/vm             |
+   |      | vm    | 1    | vm\@1              |
+   |      | vm    |      | vm                 |
+   |rbd   |       | 1    | rbd/\@1            |
+   |rbd\@x| vm/y  | 1    | rbd\\\@x/vm\\/y\@1 |
+
+   (The empty string should obviously be avoided as the image name.)
+
+   Note that the non-canonical forms /vm\@1 and rbd/vm\@ can also be parsed,
+   although they will be formatted as vm\@1 and rbd/vm.
+ */
+struct rbd_loc {
+  /**
+     Constructs an rbd_loc with the empty string for the pool, image, and snap.
+   */
+  rbd_loc();
+
+  /**
+     Constructs an rbd_loc with the given pool, image, and snap.
+   */
+  rbd_loc(const std::string &pool, const std::string &image, const std::string &snap);
+
+  /**
+     Parses an rbd_loc from the given string.
+     If parsing fails, the contents are unmodified.
+     @retval true if parsing succeeded
+   */
+  bool parse(std::string name_string);
+
+  /**
+     Returns the string representation of the locator.
+   */
+  std::string str() const;
+
+  /**
+     Compares the locators lexicographically by pool, then image, then snap.
+   */
+  int compare(const rbd_loc& rhs) const;
+
+  /**
+     Returns true if the locators have identical pool, image, and snap.
+   */
+  bool operator==(const rbd_loc& rhs) const;
+
+  /**
+     Compares the locators lexicographically by pool, then image, then snap.
+   */
+  bool operator<(const rbd_loc& rhs) const;
+
+  std::string pool;
+
+  std::string image;
+
+  std::string snap;
+};
+
+}
+
+#endif