CreateDirectory() should check if an existing path is actually a directory...

net/disk_cache/backend_impl.cc

 // Copyright (c) 2006-2008 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 "net/disk_cache/backend_impl.h"
 
 #include "base/file_util.h"
 #include "base/histogram.h"
 #include "base/message_loop.h"
 #include "base/string_util.h"
@@ skipping 712 matching lines @@
   IndexHeader header;
   header.table_len = DesiredIndexTableLen(max_size_);
 
   if (!file->Write(&header, sizeof(header), 0))
     return false;
 
   return file->SetLength(GetIndexSize(header.table_len));
 }
 
 bool BackendImpl::InitBackingStore(bool* file_created) {
-  // This call fails if the folder exists.
   file_util::CreateDirectory(path_);
 
   std::wstring index_name(path_);
   file_util::AppendToPath(&index_name, kIndexName);
 
   scoped_refptr<disk_cache::File> file(new disk_cache::File(
       CreateOSFile(index_name.c_str(), OS_FILE_READ | OS_FILE_WRITE |
           OS_FILE_SHARE_READ | OS_FILE_OPEN_ALWAYS, file_created)));
 
   if (!file->IsValid())
@@ skipping 361 matching lines @@
 
   return num_dirty;
 }
 
 bool BackendImpl::CheckEntry(EntryImpl* cache_entry) {
   RankingsNode* rankings = cache_entry->rankings()->Data();
   return !rankings->pointer;
 }
 
 }  // namespace disk_cache