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diff --git a/src/ceph/src/test/fs/mds_types.cc b/src/ceph/src/test/fs/mds_types.cc
new file mode 100644
index 0000000..b29b95f
--- /dev/null
+++ b/src/ceph/src/test/fs/mds_types.cc
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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 Red Hat
+ *
+ * Author: Greg Farnum <greg@inktank.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License version 2, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#include "gtest/gtest.h"
+#include "mds/mdstypes.h"
+#include "mds/inode_backtrace.h"
+
+TEST(inode_t, compare_equal)
+{
+  inode_t foo;
+  inode_t bar;
+  int compare_r;
+  bool divergent;
+  compare_r = foo.compare(bar, &divergent);
+  EXPECT_EQ(0, compare_r);
+  EXPECT_FALSE(divergent);
+  compare_r = bar.compare(foo, &divergent);
+  EXPECT_EQ(0, compare_r);
+  EXPECT_FALSE(divergent);
+
+
+  foo.ino = 1234;
+  foo.ctime.set_from_double(10.0);
+  foo.mode = 0777;
+  foo.uid = 42;
+  foo.gid = 43;
+  foo.nlink = 3;
+  foo.version = 3;
+
+  bar = foo;
+  compare_r = foo.compare(bar, &divergent);
+  EXPECT_EQ(0, compare_r);
+  EXPECT_FALSE(divergent);
+  compare_r = bar.compare(foo, &divergent);
+  EXPECT_EQ(0, compare_r);
+  EXPECT_FALSE(divergent);
+}
+
+TEST(inode_t, compare_aged)
+{
+  inode_t foo;
+  inode_t bar;
+
+  foo.ino = 1234;
+  foo.ctime.set_from_double(10.0);
+  foo.mode = 0777;
+  foo.uid = 42;
+  foo.gid = 43;
+  foo.nlink = 3;
+  foo.version = 3;
+  foo.rstat.version = 1;
+
+  bar = foo;
+  bar.version = 2;
+
+  int compare_r;
+  bool divergent;
+  compare_r = foo.compare(bar, &divergent);
+  EXPECT_EQ(1, compare_r);
+  EXPECT_FALSE(divergent);
+  compare_r = bar.compare(foo, &divergent);
+  EXPECT_EQ(-1, compare_r);
+  EXPECT_FALSE(divergent);
+}
+
+TEST(inode_t, compare_divergent)
+{
+  inode_t foo;
+  inode_t bar;
+
+  foo.ino = 1234;
+  foo.ctime.set_from_double(10.0);
+  foo.mode = 0777;
+  foo.uid = 42;
+  foo.gid = 43;
+  foo.nlink = 3;
+  foo.version = 3;
+  foo.rstat.version = 1;
+
+  bar = foo;
+  bar.version = 2;
+  bar.rstat.version = 2;
+
+  int compare_r;
+  bool divergent;
+  compare_r = foo.compare(bar, &divergent);
+  EXPECT_EQ(1, compare_r);
+  EXPECT_TRUE(divergent);
+  compare_r = bar.compare(foo, &divergent);
+  EXPECT_EQ(-1, compare_r);
+  EXPECT_TRUE(divergent);
+}
+
+TEST(inode_backtrace_t, compare_equal)
+{
+  inode_backtrace_t foo;
+  inode_backtrace_t bar;
+  
+  foo.ino = 1234;
+  foo.pool = 12;
+  foo.old_pools.insert(10);
+  foo.old_pools.insert(5);
+
+  inode_backpointer_t foop;
+  foop.dirino = 3;
+  foop.dname = "l3";
+  foop.version = 15;
+  foo.ancestors.push_back(foop);
+  foop.dirino = 2;
+  foop.dname = "l2";
+  foop.version = 10;
+  foo.ancestors.push_back(foop);
+  foop.dirino = 1;
+  foop.dname = "l1";
+  foop.version = 25;
+  foo.ancestors.push_back(foop);
+ 
+  bar = foo;
+  
+  int compare_r;
+  bool equivalent;
+  bool divergent;
+
+  compare_r = foo.compare(bar, &equivalent, &divergent);
+  EXPECT_EQ(0, compare_r);
+  EXPECT_TRUE(equivalent);
+  EXPECT_FALSE(divergent);
+}
+
+TEST(inode_backtrace_t, compare_newer)
+{
+  inode_backtrace_t foo;
+  inode_backtrace_t bar;
+
+  foo.ino = 1234;
+  foo.pool = 12;
+  foo.old_pools.insert(10);
+  foo.old_pools.insert(5);
+
+  bar.ino = 1234;
+  bar.pool = 12;
+  bar.old_pools.insert(10);
+
+  inode_backpointer_t foop;
+  foop.dirino = 3;
+  foop.dname = "l3";
+  foop.version = 15;
+  foo.ancestors.push_back(foop);
+  foop.version = 14;
+  bar.ancestors.push_back(foop);
+
+  foop.dirino = 2;
+  foop.dname = "l2";
+  foop.version = 10;
+  foo.ancestors.push_back(foop);
+  foop.version = 9;
+  bar.ancestors.push_back(foop);
+
+  foop.dirino = 1;
+  foop.dname = "l1";
+  foop.version = 25;
+  foo.ancestors.push_back(foop);
+  bar.ancestors.push_back(foop);
+
+  int compare_r;
+  bool equivalent;
+  bool divergent;
+
+  compare_r = foo.compare(bar, &equivalent, &divergent);
+  EXPECT_EQ(1, compare_r);
+  EXPECT_TRUE(equivalent);
+  EXPECT_FALSE(divergent);
+
+  compare_r = bar.compare(foo, &equivalent, &divergent);
+  EXPECT_EQ(-1, compare_r);
+  EXPECT_TRUE(equivalent);
+  EXPECT_FALSE(divergent);
+
+  bar.ancestors.back().dirino = 75;
+  bar.ancestors.back().dname = "l1-old";
+  bar.ancestors.back().version = 70;
+
+  compare_r = foo.compare(bar, &equivalent, &divergent);
+  EXPECT_EQ(1, compare_r);
+  EXPECT_FALSE(equivalent);
+  EXPECT_FALSE(divergent);
+
+  compare_r = bar.compare(foo, &equivalent, &divergent);
+  EXPECT_EQ(-1, compare_r);
+  EXPECT_FALSE(equivalent);
+  EXPECT_FALSE(divergent);
+}
+
+TEST(inode_backtrace_t, compare_divergent)
+{
+  inode_backtrace_t foo;
+  inode_backtrace_t bar;
+
+  foo.ino = 1234;
+  foo.pool = 12;
+  foo.old_pools.insert(10);
+  foo.old_pools.insert(5);
+
+  bar.ino = 1234;
+  bar.pool = 12;
+  bar.old_pools.insert(10);
+
+  inode_backpointer_t foop;
+  foop.dirino = 3;
+  foop.dname = "l3";
+  foop.version = 15;
+  foo.ancestors.push_back(foop);
+  foop.version = 17;
+  bar.ancestors.push_back(foop);
+
+  foop.dirino = 2;
+  foop.dname = "l2";
+  foop.version = 10;
+  foo.ancestors.push_back(foop);
+  foop.version = 9;
+  bar.ancestors.push_back(foop);
+
+  foop.dirino = 1;
+  foop.dname = "l1";
+  foop.version = 25;
+  foo.ancestors.push_back(foop);
+  bar.ancestors.push_back(foop);
+
+  int compare_r;
+  bool equivalent;
+  bool divergent;
+
+  compare_r = foo.compare(bar, &equivalent, &divergent);
+  EXPECT_EQ(1, compare_r);
+  EXPECT_TRUE(divergent);
+  compare_r = bar.compare(foo, &equivalent, &divergent);
+  EXPECT_EQ(-1, compare_r);
+  EXPECT_TRUE(divergent);
+}