Add mount sources for a MountNode (inode)

native_client_sdk/src/libraries/nacl_mounts/mount_node.cc

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <string>
@@ skipping 12 matching lines @@
 MountNode::~MountNode() {
 }
 
 bool MountNode::Init(int mode, short gid, short uid) {
   stat_.st_mode = mode;
   stat_.st_gid = gid;
   stat_.st_uid = uid;
   return true;
 }
 
-void MountNode::Destroy() {
+int MountNode::Close() {
   FSync();
-  mount_->FreeNode(this);
+  return 0;
 }
 
 int MountNode::FSync() {
   return 0;
 }
 
 int MountNode::GetDents(size_t offs, struct dirent* pdir, size_t count) {
   errno = ENOTDIR;
   return -1;
 }
@@ skipping 60 matching lines @@
 int MountNode::RemoveChild(const std::string& name) {
   errno = ENOTDIR;
   return -1;
 }
 
 MountNode* MountNode::FindChild(const std::string& name) {
   errno = ENOTDIR;
   return NULL;
 }
 
+int MountNode::ChildCount() {
+  errno = ENOTDIR;
+  return -1;
+}
+
 void MountNode::Link() {
   Acquire();
   stat_.st_nlink++;
 }
 
 void MountNode::Unlink() {
   stat_.st_nlink--;
   Release();
 }