Plumbing though mode parameter to open, since fusefs can make use of it.

native_client_sdk/src/libraries/nacl_io/filesystem.h

 // Copyright 2013 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_IO_FILESYSTEM_H_
 #define LIBRARIES_NACL_IO_FILESYSTEM_H_
 
 #include <map>
 #include <string>
 
@@ skipping 44 matching lines @@
   // |ppapi| can be NULL. If so, this filesystem cannot make any pepper calls.
   virtual Error Init(const FsInitArgs& args);
   virtual void Destroy();
 
  public:
   PepperInterface* ppapi() { return ppapi_; }
   int dev() { return dev_; }
 
   // All paths in functions below are expected to containing a leading "/".
 
+  // Open a node at |path| with the specified open and modeflags. The resulting
+  // Node is created with a ref count of 1.
+  // Assumes that |out_node| is non-NULL.
+  virtual Error OpenWithMode(const Path& path,
+                             int open_flags,
+                             mode_t mode,
+                             ScopedNode* out_node) = 0;
+
   // Open a node at |path| with the specified open flags. The resulting
   // Node is created with a ref count of 1.
   // Assumes that |out_node| is non-NULL.
-  virtual Error Open(const Path& path,
-                     int open_flags,
-                     ScopedNode* out_node) = 0;
+  Error Open(const Path& path,
+             int open_flags,
+             ScopedNode* out_node);
 
   // OpenResource is only used to read files from the NaCl NMF file. No
   // filesystem except PassthroughFs should implement it.
   // Assumes that |out_node| is non-NULL.
   virtual Error OpenResource(const Path& path, ScopedNode* out_node);
 
   // Unlink, Mkdir, Rmdir will affect the both the RefCount
   // and the nlink number in the stat object.
   virtual Error Unlink(const Path& path) = 0;
   virtual Error Mkdir(const Path& path, int permissions) = 0;
@@ skipping 21 matching lines @@
   // May only be called by the KernelProxy when the Kernel's
   // lock is held, so we make it private.
   friend class KernelObject;
   friend class KernelProxy;
   DISALLOW_COPY_AND_ASSIGN(Filesystem);
 };
 
 }  // namespace nacl_io
 
 #endif  // LIBRARIES_NACL_IO_FILESYSTEM_H_