Add readdir policies

src/fs_inode.cpp

@@ -208,6 +208,19 @@ namespace fs
       return g_func(fusepath_,fusepath_len_,mode_,dev_,ino_);
     }
 
+    uint64_t
+    calc(std::string const &fusepath_,
+         const mode_t       mode_,
+         const dev_t        dev_,
+         const ino_t        ino_)
+    {
+      return calc(fusepath_.c_str(),
+                  fusepath_.size(),
+                  mode_,
+                  dev_,
+                  ino_);
+    }
+
     void
     calc(const char     *fusepath_,
          const uint64_t  fusepath_len_,