diff --git a/src/passthrough.cpp b/src/passthrough.cpp
new file mode 100644
index 00000000..edf2e617
--- /dev/null
+++ b/src/passthrough.cpp
@@ -0,0 +1,59 @@
+#include "passthrough.hpp"
+
+#include "boost/unordered/concurrent_flat_map.hpp"
+
+#include <string>
+
+typedef boost::unordered::concurrent_flat_map<std::string,PTInfo> PTMap;
+static PTMap g_PT;
+
+namespace PassthroughStuff
+{
+  std::mutex*
+  get_mutex(const char *fusepath_)
+  {
+    std::mutex *m = nullptr;
+
+    g_PT.visit(fusepath_,
+             [&](const PTMap::value_type &x_)
+             {
+               m = &x_.second.mutex;
+             });
+
+    if(!m)
+      {
+        g_PT.insert(PTMap::value_type{fusepath_,PTInfo{}});
+        g_PT.visit(fusepath_,
+                   [&](const PTMap::value_type &x_)
+                   {
+                     m = &x_.second.mutex;
+                   });
+      }
+
+    return m;
+  }
+
+  PTInfo*
+  get_pti(const char *fusepath_)
+  {
+    PTInfo *pti = nullptr;
+
+    g_PT.visit(fusepath_,
+             [&](PTMap::value_type &x_)
+             {
+               pti = &x_.second;
+             });
+
+    if(!pti)
+      {
+        g_PT.insert(PTMap::value_type{fusepath_,PTInfo{}});
+        g_PT.visit(fusepath_,
+                   [&](PTMap::value_type &x_)
+                   {
+                     pti = &x_.second;                     
+                   });
+      }
+
+    return pti;
+  }  
+};
diff --git a/src/passthrough.hpp b/src/passthrough.hpp
new file mode 100644
index 00000000..d9b1c16a
--- /dev/null
+++ b/src/passthrough.hpp
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <mutex>
+#include <string>
+
+struct PTInfo
+{
+  PTInfo()
+    : path_fd(-1),
+      backing_id(0),
+      open_count(0)
+  {
+  }
+
+  PTInfo(PTInfo &&pti_)
+  {
+    std::lock_guard<std::mutex> _(mutex);
+
+    path_fd    = pti_.path_fd;
+    backing_id = pti_.backing_id;
+    filepath   = pti_.filepath;
+    open_count = pti_.open_count;
+  }
+
+  int path_fd;
+  int backing_id;
+  unsigned open_count;
+  std::string filepath;
+  mutable std::mutex mutex;
+};
+
+namespace PassthroughStuff
+{
+  PTInfo* get_pti(const char *fusepath);
+}