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diff --git a/src/ceph/src/mds/inode_backtrace.cc b/src/ceph/src/mds/inode_backtrace.cc
new file mode 100644
index 0000000..314f175
--- /dev/null
+++ b/src/ceph/src/mds/inode_backtrace.cc
@@ -0,0 +1,162 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+
+#include "inode_backtrace.h"
+
+#include "common/Formatter.h"
+
+/* inode_backpointer_t */
+
+void inode_backpointer_t::encode(bufferlist& bl) const
+{
+  ENCODE_START(2, 2, bl);
+  ::encode(dirino, bl);
+  ::encode(dname, bl);
+  ::encode(version, bl);
+  ENCODE_FINISH(bl);
+}
+
+void inode_backpointer_t::decode(bufferlist::iterator& bl)
+{
+  DECODE_START_LEGACY_COMPAT_LEN(2, 2, 2, bl);
+  ::decode(dirino, bl);
+  ::decode(dname, bl);
+  ::decode(version, bl);
+  DECODE_FINISH(bl);
+}
+
+void inode_backpointer_t::decode_old(bufferlist::iterator& bl)
+{
+  ::decode(dirino, bl);
+  ::decode(dname, bl);
+  ::decode(version, bl);
+}
+
+void inode_backpointer_t::dump(Formatter *f) const
+{
+  f->dump_unsigned("dirino", dirino);
+  f->dump_string("dname", dname);
+  f->dump_unsigned("version", version);
+}
+
+void inode_backpointer_t::generate_test_instances(list<inode_backpointer_t*>& ls)
+{
+  ls.push_back(new inode_backpointer_t);
+  ls.push_back(new inode_backpointer_t);
+  ls.back()->dirino = 1;
+  ls.back()->dname = "foo";
+  ls.back()->version = 123;
+}
+
+
+/*
+ * inode_backtrace_t
+ */
+
+void inode_backtrace_t::encode(bufferlist& bl) const
+{
+  ENCODE_START(5, 4, bl);
+  ::encode(ino, bl);
+  ::encode(ancestors, bl);
+  ::encode(pool, bl);
+  ::encode(old_pools, bl);
+  ENCODE_FINISH(bl);
+}
+
+void inode_backtrace_t::decode(bufferlist::iterator& bl)
+{
+  DECODE_START_LEGACY_COMPAT_LEN(5, 4, 4, bl);
+  if (struct_v < 3)
+    return;  // sorry, the old data was crap
+  ::decode(ino, bl);
+  if (struct_v >= 4) {
+    ::decode(ancestors, bl);
+  } else {
+    __u32 n;
+    ::decode(n, bl);
+    while (n--) {
+      ancestors.push_back(inode_backpointer_t());
+      ancestors.back().decode_old(bl);
+    }
+  }
+  if (struct_v >= 5) {
+    ::decode(pool, bl);
+    ::decode(old_pools, bl);
+  }
+  DECODE_FINISH(bl);
+}
+
+void inode_backtrace_t::dump(Formatter *f) const
+{
+  f->dump_unsigned("ino", ino);
+  f->open_array_section("ancestors");
+  for (vector<inode_backpointer_t>::const_iterator p = ancestors.begin(); p != ancestors.end(); ++p) {
+    f->open_object_section("backpointer");
+    p->dump(f);
+    f->close_section();
+  }
+  f->close_section();
+  f->dump_int("pool", pool);
+  f->open_array_section("old_pools");
+  for (set<int64_t>::iterator p = old_pools.begin(); p != old_pools.end(); ++p) {
+    f->dump_int("old_pool", *p);
+  }
+  f->close_section();
+}
+
+void inode_backtrace_t::generate_test_instances(list<inode_backtrace_t*>& ls)
+{
+  ls.push_back(new inode_backtrace_t);
+  ls.push_back(new inode_backtrace_t);
+  ls.back()->ino = 1;
+  ls.back()->ancestors.push_back(inode_backpointer_t());
+  ls.back()->ancestors.back().dirino = 123;
+  ls.back()->ancestors.back().dname = "bar";
+  ls.back()->ancestors.back().version = 456;
+  ls.back()->pool = 0;
+  ls.back()->old_pools.insert(10);
+  ls.back()->old_pools.insert(7);
+}
+
+int inode_backtrace_t::compare(const inode_backtrace_t& other,
+                               bool *equivalent, bool *divergent) const
+{
+  int min_size = MIN(ancestors.size(),other.ancestors.size());
+  *equivalent = true;
+  *divergent = false;
+  if (min_size == 0)
+    return 0;
+  int comparator = 0;
+  if (ancestors[0].version > other.ancestors[0].version)
+    comparator = 1;
+  else if (ancestors[0].version < other.ancestors[0].version)
+    comparator = -1;
+  if (ancestors[0].dirino != other.ancestors[0].dirino ||
+      ancestors[0].dname != other.ancestors[0].dname)
+    *divergent = true;
+  for (int i = 1; i < min_size; ++i) {
+    if (*divergent) {
+      /**
+       * we already know the dentries and versions are
+       * incompatible; no point checking farther
+       */
+      break;
+    }
+    if (ancestors[i].dirino != other.ancestors[i].dirino ||
+        ancestors[i].dname != other.ancestors[i].dname) {
+      *equivalent = false;
+      return comparator;
+    } else if (ancestors[i].version > other.ancestors[i].version) {
+      if (comparator < 0)
+        *divergent = true;
+      comparator = 1;
+    } else if (ancestors[i].version < other.ancestors[i].version) {
+      if (comparator > 0)
+        *divergent = true;
+      comparator = -1;
+    }
+  }
+  if (*divergent)
+    *equivalent = false;
+  return comparator;
+}