Disk cache: Prevent obscure file corruption and deal...

net/disk_cache/entry_impl.cc

 // Copyright (c) 2006-2010 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/entry_impl.h"
 
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/string_util.h"
 #include "base/values.h"
@@ skipping 571 matching lines @@
 
   backend_->DeleteBlock(node_.address(), false);
   backend_->DeleteBlock(entry_.address(), false);
 }
 
 CacheAddr EntryImpl::GetNextAddress() {
   return entry_.Data()->next;
 }
 
 void EntryImpl::SetNextAddress(Addr address) {
+  DCHECK_NE(address.value(), entry_.address().value());
   entry_.Data()->next = address.value();
   bool success = entry_.Store();
   DCHECK(success);
 }
 
 bool EntryImpl::LoadNodeAddress() {
   Addr address(entry_.Data()->rankings_node);
   if (!node_.LazyInit(backend_->File(address), address))
     return false;
   return node_.Load();
@@ skipping 833 matching lines @@
   Trace("%s 0x%p 0x%x 0x%x", msg, reinterpret_cast<void*>(this),
         entry_.address().value(), node_.address().value());
 
   Trace("  data: 0x%x 0x%x 0x%x", entry_.Data()->data_addr[0],
         entry_.Data()->data_addr[1], entry_.Data()->long_key);
 
   Trace("  doomed: %d 0x%x", doomed_, dirty);
 }
 
 }  // namespace disk_cache