From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263734AbTDITVr (for ); Wed, 9 Apr 2003 15:21:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263741AbTDITVq (for ); Wed, 9 Apr 2003 15:21:46 -0400 Received: from pop.gmx.de ([213.165.65.60]:23551 "HELO mail.gmx.net") by vger.kernel.org with SMTP id S263734AbTDITVq (for ); Wed, 9 Apr 2003 15:21:46 -0400 From: "Oliver S." To: Subject: questions regarding Journalling-FSes and w-cache reordering Date: Wed, 9 Apr 2003 21:33:20 +0200 Message-ID: <000901c2fece$e2801c80$0200000a@kimba> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org I've got a question regarding the behaviour of w-caches with ATA-harddisks: Is a ATA-harddisk allowed to reorder the operations from in w-cache ? On one side, this would be an opportunity to optimize head-movements (although a good cyclical-scan drive-scheduler would gain the same if it can rely on a linear sector-mapping), but on the other side, this would compromise the two-phase commiting of journalling FSes and render it useless. So I doubt that reorder- ing is allowed with ATA-HDs. Are my assumptions right ?