Handle inconsistency between DB and Files

webkit/fileapi/sandbox_mount_point_provider.cc

 // Copyright (c) 2011 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 "webkit/fileapi/sandbox_mount_point_provider.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/scoped_callback_factory.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 507 matching lines @@
 int64 SandboxMountPointProvider::GetOriginUsageOnFileThread(
     const GURL& origin_url, fileapi::FileSystemType type) {
   DCHECK(type == fileapi::kFileSystemTypeTemporary ||
          type == fileapi::kFileSystemTypePersistent);
   FilePath base_path =
       GetBaseDirectoryForOriginAndType(origin_url, type, false);
   if (base_path.empty() || !file_util::DirectoryExists(base_path)) return 0;
   FilePath usage_file_path =
       base_path.AppendASCII(FileSystemUsageCache::kUsageFileName);
 
+  bool is_valid = FileSystemUsageCache::IsValid(usage_file_path);
   int32 dirty_status = FileSystemUsageCache::GetDirty(usage_file_path);
   bool visited = (visited_origins_.find(origin_url) != visited_origins_.end());
   visited_origins_.insert(origin_url);
-  if (dirty_status == 0 || (dirty_status > 0 && visited)) {
+  if (is_valid && (dirty_status == 0 || (dirty_status > 0 && visited))) {
     // The usage cache is clean (dirty == 0) or the origin is already
     // initialized and running.  Read the cache file to get the usage.
     return FileSystemUsageCache::GetUsage(usage_file_path);
   }
   // The usage cache has not been initialized or the cache is dirty.
   // Get the directory size now and update the cache.
   FileSystemUsageCache::Delete(usage_file_path);
 
   FileSystemOperationContext context(NULL, sandbox_file_util_);
   context.set_src_origin_url(origin_url);
@@ skipping 70 matching lines @@
 
 void SandboxMountPointProvider::EndUpdateOriginOnFileThread(
     const GURL& origin_url, fileapi::FileSystemType type) {
   DCHECK(type == fileapi::kFileSystemTypeTemporary ||
          type == fileapi::kFileSystemTypePersistent);
   FilePath usage_file_path = GetUsageCachePathForOriginAndType(
       origin_url, type);
   FileSystemUsageCache::DecrementDirty(usage_file_path);
 }
 
+void SandboxMountPointProvider::InvalidateUsageCache(
+    const GURL& origin_url, fileapi::FileSystemType type) {
+  DCHECK(type == fileapi::kFileSystemTypeTemporary ||
+         type == fileapi::kFileSystemTypePersistent);
+  FilePath usage_file_path = GetUsageCachePathForOriginAndType(
+      origin_url, type);
+  FileSystemUsageCache::IncrementDirty(usage_file_path);
+}
+
 FileSystemFileUtil* SandboxMountPointProvider::GetFileSystemFileUtil() {
   return sandbox_file_util_.get();
 }
 
 FilePath SandboxMountPointProvider::GetUsageCachePathForOriginAndType(
     const GURL& origin_url, fileapi::FileSystemType type) const {
   FilePath base_path =
       GetBaseDirectoryForOriginAndType(origin_url, type, false);
   if (base_path.empty())
     return FilePath();
@@ skipping 19 matching lines @@
 
   // Creates the root directory.
   root = origin_base_path.Append(OldCreateUniqueDirectoryName(origin_url));
   if (!file_util::CreateDirectory(root))
     return FilePath();
 
   return root;
 }
 
 }  // namespace fileapi