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

native_client_sdk/src/libraries/nacl_io/devfs/dev_fs.cc

 // 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.
 
 #if defined(WIN32)
 #define _CRT_RAND_S
 #endif
 
 #include "nacl_io/devfs/dev_fs.h"
 
@@ skipping 222 matching lines @@
 FsNode::FsNode(Filesystem* filesystem, Filesystem* other_fs)
     : Node(filesystem), other_fs_(other_fs) {
 }
 
 Error FsNode::VIoctl(int request, va_list args) {
   return other_fs_->Filesystem_VIoctl(request, args);
 }
 
 }  // namespace
 
-Error DevFs::Open(const Path& path, int open_flags, ScopedNode* out_node) {
+Error DevFs::OpenWithMode(const Path& path, int open_flags,
+                          mode_t mode, ScopedNode* out_node) {
   out_node->reset(NULL);
   int error;
   if (path.Part(1) == "fs") {
     if (path.Size() == 3) {
       error = fs_dir_->FindChild(path.Part(2), out_node);
     } else {
       LOG_TRACE("Bad devfs path: %s", path.Join().c_str());
       error = ENOENT;
     }
   } else {
@@ skipping 93 matching lines @@
   // Add a directory for "fs" nodes; they represent all currently-mounted
   // filesystems. We can ioctl these nodes to make changes or provide input to
   // a mounted filesystem.
   INITIALIZE_DEV_NODE("/fs", DirNode);
   fs_dir_ = new_node;
 
   return 0;
 }
 
 }  // namespace nacl_io