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diff --git a/src/ceph/src/client/UserPerm.h b/src/ceph/src/client/UserPerm.h
new file mode 100644
index 0000000..a2d6ccb
--- /dev/null
+++ b/src/ceph/src/client/UserPerm.h
@@ -0,0 +1,93 @@
+// -*- 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 CEPH_CLIENT_USERPERM_H
+#define CEPH_CLIENT_USERPERM_H
+
+struct UserPerm
+{
+private:
+  uid_t m_uid;
+  gid_t m_gid;
+  int gid_count;
+  gid_t *gids;
+  bool alloced_gids;
+  void deep_copy_from(const UserPerm& b) {
+    if (alloced_gids) {
+      delete[] gids;
+      alloced_gids = false;
+    }
+    m_uid = b.m_uid;
+    m_gid = b.m_gid;
+    gid_count = b.gid_count;
+    if (gid_count) {
+      gids = new gid_t[gid_count];
+      alloced_gids = true;
+      for (int i = 0; i < gid_count; ++i) {
+	gids[i] = b.gids[i];
+      }
+    }
+  }
+public:
+  UserPerm() : m_uid(-1), m_gid(-1), gid_count(0),
+	       gids(NULL), alloced_gids(false) {}
+  UserPerm(uid_t uid, gid_t gid, int ngids=0, gid_t *gidlist=NULL) :
+	    m_uid(uid), m_gid(gid), gid_count(ngids),
+	    gids(gidlist), alloced_gids(false) {}
+  UserPerm(const UserPerm& o) : UserPerm() {
+    deep_copy_from(o);
+  }
+  UserPerm(UserPerm && o) {
+    m_uid = o.m_uid;
+    m_gid = o.m_gid;
+    gid_count = o.gid_count;
+    gids = o.gids;
+    alloced_gids = o.alloced_gids;
+    o.gids = NULL;
+    o.gid_count = 0;
+  }
+  ~UserPerm() {
+    if (alloced_gids)
+      delete[] gids;
+  }
+  UserPerm& operator=(const UserPerm o) {
+    deep_copy_from(o);
+    return *this;
+  }
+
+  uid_t uid() const { return m_uid != (uid_t)-1 ? m_uid : ::geteuid(); }
+  gid_t gid() const { return m_gid != (gid_t)-1 ? m_gid : ::getegid(); }
+  bool gid_in_groups(gid_t id) const {
+    if (id == gid()) return true;
+    for (int i = 0; i < gid_count; ++i) {
+      if (id == gids[i]) return true;
+    }
+    return false;
+  }
+  int get_gids(const gid_t **_gids) const { *_gids = gids; return gid_count; }
+  void init_gids(gid_t* _gids, int count) {
+    gids = _gids;
+    gid_count = count;
+  }
+  void take_gids() { alloced_gids = true; }
+  void shallow_copy(const UserPerm& o) {
+    m_uid = o.m_uid;
+    m_gid = o.m_gid;
+    gid_count = o.gid_count;
+    gids = o.gids;
+    alloced_gids = false;
+  }
+};
+
+#endif