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diff --git a/src/tools/cephfs/PgFiles.h b/src/tools/cephfs/PgFiles.h
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+++ b/src/tools/cephfs/PgFiles.h
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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) 2016 Red Hat
+ *
+ * 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 PG_EFFECTS_H_
+#define PG_EFFECTS_H_
+
+#include "include/cephfs/libcephfs.h"
+#include "osd/osd_types.h"
+#include <set>
+#include "osdc/Objecter.h"
+
+/**
+ * This utility scans the files (via an online MDS) and works out
+ * which ones rely on named PGs.  For use when someone has
+ * some bad/damaged PGs and wants to see which files might be
+ * affected.
+ */
+class PgFiles
+{
+private:
+  Objecter *objecter;
+  struct ceph_mount_info *cmount = nullptr;
+
+  std::set<pg_t> pgs;
+  std::set<uint64_t> pools;
+
+  void hit_file(std::string const &path, const struct ceph_statx &stx);
+  void hit_dir(std::string const &path);
+
+
+public:
+  PgFiles(Objecter *o, const std::set<pg_t> &pgs_);
+  ~PgFiles();
+
+  int init();
+  int scan_path(std::string const &path);
+};
+
+#endif
+