Detect file system errors during downloads.

content/browser/download/download_file_manager.h

 // 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.
 //
 // The DownloadFileManager owns a set of DownloadFile objects, each of which
 // represent one in progress download and performs the disk IO for that
 // download. The DownloadFileManager itself is a singleton object owned by the
 // ResourceDispatcherHost.
 //
 // The DownloadFileManager uses the file_thread for performing file write
@@ skipping 64 matching lines @@
 
   // Called on the IO or UI threads.
   int GetNextId();
 
   // Called on UI thread to make DownloadFileManager start the download.
   void StartDownload(DownloadCreateInfo* info);
 
   // Handlers for notifications sent from the IO thread and run on the
   // FILE thread.
   void UpdateDownload(int id, DownloadBuffer* buffer);
-  // |os_error| is 0 for normal completions, and non-0 for errors.
+  // |net_error| is 0 for normal completions, and non-0 for errors.
   // |security_info| contains SSL information (cert_id, cert_status,
   // security_bits, ssl_connection_status), which can be used to
   // fine-tune the error message.  It is empty if the transaction
   // was not performed securely.
   void OnResponseCompleted(int id,
                            DownloadBuffer* buffer,
-                           int os_error,
+                           int net_error,
                            const std::string& security_info);
 
   // Handlers for notifications sent from the UI thread and run on the
   // FILE thread.  These are both terminal actions with respect to the
   // download file, as far as the DownloadFileManager is concerned -- if
   // anything happens to the download file after they are called, it will
   // be ignored.
   void CancelDownload(int id);
   void CompleteDownload(int id);
 
@@ skipping 38 matching lines @@
   // process.
   void CreateDownloadFile(DownloadCreateInfo* info,
                           DownloadManager* download_manager,
                           bool hash_needed);
 
   // Called only on the download thread.
   DownloadFile* GetDownloadFile(int id);
 
   // Called only from RenameInProgressDownloadFile and
   // RenameCompletingDownloadFile on the FILE thread.
-  void CancelDownloadOnRename(int id);
+  // |rename_error| indicates what network error caused the cancel.
+  void CancelDownloadOnRename(int id, int rename_error);
 
   // Erases the download file with the given the download |id| and removes
   // it from the maps.
   void EraseDownload(int id);
 
   // Unique ID for each DownloadItem.
   base::AtomicSequenceNumber next_id_;
 
   typedef base::hash_map<int, DownloadFile*> DownloadFileMap;
 
   // A map of all in progress downloads.  It owns the download files.
   DownloadFileMap downloads_;
 
   // Schedule periodic updates of the download progress. This timer
   // is controlled from the FILE thread, and posts updates to the UI thread.
   base::RepeatingTimer<DownloadFileManager> update_timer_;
 
   ResourceDispatcherHost* resource_dispatcher_host_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadFileManager);
 };
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_FILE_MANAGER_H_