diff --git a/src/Makefile.am b/src/Makefile.am
index cd8e23322ec..9d338eb59e0 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -854,11 +854,11 @@ test_rados_api_misc_LDADD =  librados.la ${UNITTEST_STATIC_LDADD}
 test_rados_api_misc_CXXFLAGS = ${AM_CXXFLAGS} ${UNITTEST_CXXFLAGS}
 bin_DEBUGPROGRAMS += test_rados_api_misc
 
-test_libcephfs_readdir_SOURCES = test/libcephfs/readdir_r_cb.cc
-test_libcephfs_readdir_LDFLAGS = $(PTHREAD_CFLAGS) ${AM_LDFLAGS}
-test_libcephfs_readdir_LDADD =  ${UNITTEST_STATIC_LDADD} libcephfs.la
-test_libcephfs_readdir_CXXFLAGS = $(AM_CXXFLAGS) ${UNITTEST_CXXFLAGS}
-bin_DEBUGPROGRAMS += test_libcephfs_readdir
+test_libcephfs_SOURCES = test/libcephfs/test.cc test/libcephfs/readdir_r_cb.cc
+test_libcephfs_LDFLAGS = $(PTHREAD_CFLAGS) ${AM_LDFLAGS}
+test_libcephfs_LDADD =  ${UNITTEST_STATIC_LDADD} libcephfs.la
+test_libcephfs_CXXFLAGS = $(AM_CXXFLAGS) ${UNITTEST_CXXFLAGS}
+bin_DEBUGPROGRAMS += test_libcephfs
 
 test_filestore_SOURCES = test/filestore/store_test.cc
 test_filestore_LDFLAGS = ${AM_LDFLAGS}
diff --git a/src/include/filepath.h b/src/include/filepath.h
index 88470759197..ec1519d5464 100644
--- a/src/include/filepath.h
+++ b/src/include/filepath.h
@@ -90,7 +90,7 @@ class filepath {
    * if we are fed a relative path as a string, either set ino=0 (strictly
    * relative) or 1 (absolute).  throw out any leading '/'.
    */
-  filepath(const char *s) {
+  filepath(const char *s) : encoded(false) {
     set_path(s);
   }
   void set_path(const char *s) {
diff --git a/src/mds/Server.cc b/src/mds/Server.cc
index c87f4a847f6..4c52ca2f36d 100644
--- a/src/mds/Server.cc
+++ b/src/mds/Server.cc
@@ -1876,7 +1876,6 @@ CInode* Server::rdlock_path_pin_ref(MDRequest *mdr, int n,
   if (mdr->done_locking)
     return mdr->in[n];
 
-
   // traverse
   int r = mdcache->path_traverse(mdr, NULL, NULL, refpath, &mdr->dn[n], &mdr->in[n], MDS_TRAVERSE_FORWARD);
   if (r > 0)
@@ -2099,6 +2098,14 @@ void Server::handle_client_getattr(MDRequest *mdr, bool is_lookup)
 {
   MClientRequest *req = mdr->client_request;
   set<SimpleLock*> rdlocks, wrlocks, xlocks;
+
+  if (req->get_filepath().depth() == 0 && is_lookup) {
+    // refpath can't be empty for lookup but it can for
+    // getattr (we do getattr with empty refpath for mount of '/')
+    reply_request(mdr, -EINVAL);
+    return;
+  }
+
   CInode *ref = rdlock_path_pin_ref(mdr, 0, rdlocks, false, false, NULL, !is_lookup);
   if (!ref) return;
 
diff --git a/src/test/libcephfs/test.cc b/src/test/libcephfs/test.cc
new file mode 100644
index 00000000000..af79b72c5ab
--- /dev/null
+++ b/src/test/libcephfs/test.cc
@@ -0,0 +1,67 @@
+// -*- 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) 2011 New Dream Network
+ *
+ * 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.
+ *
+ */
+
+#include "gtest/gtest.h"
+#include "include/cephfs/libcephfs.h"
+#include <errno.h>
+#include <sys/fcntl.h>
+#include <unistd.h>
+#include <sys/types.h>
+
+TEST(LibCephFS, Open_empty_component) {
+
+  pid_t mypid = getpid();
+  struct ceph_mount_info *cmount;
+  ASSERT_EQ(0, ceph_create(&cmount, NULL));
+  ASSERT_EQ(0, ceph_conf_read_file(cmount, NULL));
+  ASSERT_EQ(0, ceph_mount(cmount, "/"));
+
+  char c_dir[1024];
+  sprintf(c_dir, "/open_test_%d", mypid);
+  struct ceph_dir_result *dirp;
+
+  ASSERT_EQ(0, ceph_mkdirs(cmount, c_dir, 0777));
+
+  ASSERT_EQ(0, ceph_opendir(cmount, c_dir, &dirp));
+
+  char c_path[1024];
+  sprintf(c_path, "/open_test_%d//created_file_%d", mypid, mypid);
+  int fd = ceph_open(cmount, c_path, O_RDONLY|O_CREAT, 0666);
+  ASSERT_LT(0, fd);
+
+  ASSERT_EQ(0, ceph_close(cmount, fd));
+  ASSERT_EQ(0, ceph_closedir(cmount, dirp));
+  ceph_shutdown(cmount);
+
+  ASSERT_EQ(0, ceph_create(&cmount, NULL));
+  ASSERT_EQ(0, ceph_conf_read_file(cmount, NULL));
+
+  ASSERT_EQ(0, ceph_mount(cmount, "/"));
+
+  fd = ceph_open(cmount, c_path, O_RDONLY, 0666);
+  ASSERT_LT(0, fd);
+
+  ASSERT_EQ(0, ceph_close(cmount, fd));
+  ASSERT_EQ(0, ceph_closedir(cmount, dirp));
+  ceph_shutdown(cmount);
+}
+
+TEST(LibCephFS, Mount_non_exist) {
+
+  struct ceph_mount_info *cmount;
+
+  ASSERT_EQ(0, ceph_create(&cmount, NULL));
+  ASSERT_EQ(0, ceph_conf_read_file(cmount, NULL));
+  ASSERT_NE(0, ceph_mount(cmount, "/non-exist"));
+}