Add mount sources for a MountNode (inode)

native_client_sdk/src/libraries/nacl_mounts/mount_node.h

 /* 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.
  */
 
 #ifndef LIBRARIES_NACL_MOUNTS_MOUNT_NODE_H_
 #define LIBRARIES_NACL_MOUNTS_MOUNT_NODE_H_
 
 #include <sys/stat.h>
 
 #include <string>
 #include "ref_object.h"
 
 struct dirent;
 struct stat;
 class Mount;
 class MountNode;
 
 class MountNode : public RefObject {
  protected:
   virtual ~MountNode();
 
  protected:
   MountNode(Mount* mount, int ino, int dev);
   virtual bool Init(int mode, short uid, short gid);
-  virtual void Destroy();
+  virtual int Close();
 
 public:
   // Normal OS operations on a node (file), can be called by the kernel
   // directly so it must lock and unlock appropriately.  These functions
   // must not be called by the mount.
   virtual int FSync();
   virtual int GetDents(size_t offs, struct dirent* pdir, size_t count);
   virtual int GetStat(struct stat* stat);
   virtual int Ioctl(int request, char* arg);
   virtual int Read(size_t offs, void* buf, size_t count);
@@ skipping 11 matching lines @@
 protected:
   // Directory operations on the node are done by the Mount. The mount's lock
   // must be held while these calls are made.
 
   // Adds or removes a directory entry updating the link numbers and refcount
   virtual int AddChild(const std::string& name, MountNode *node);
   virtual int RemoveChild(const std::string& name);
 
   // Find a child and return it without updating the refcount
   virtual MountNode* FindChild(const std::string& name);
+  virtual int ChildCount();
 
   // Update the link count
   virtual void Link();
   virtual void Unlink();
 
 protected:
   struct stat stat_;
   Mount* mount_;
 
-  friend class Mount;
+  friend class MountHFS;
+  friend class MountMem;
   friend class MountNodeDir;
 };
 
 #endif  // LIBRARIES_NACL_MOUNTS_MOUNT_NODE_H_