--- /dev/null
+// -*- 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(std::string pool, std::string image, 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