From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263875AbTDIXRP (for ); Wed, 9 Apr 2003 19:17:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263883AbTDIXRP (for ); Wed, 9 Apr 2003 19:17:15 -0400 Received: from inet-mail1.oracle.com ([148.87.2.201]:4487 "EHLO inet-mail1.oracle.com") by vger.kernel.org with ESMTP id S263875AbTDIXRO (for ); Wed, 9 Apr 2003 19:17:14 -0400 Date: Wed, 9 Apr 2003 16:27:15 -0700 From: Joel Becker To: Rob van Nieuwkerk Cc: Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: O_DIRECT alignment requirements ? Message-ID: <20030409232715.GE31739@ca-server1.us.oracle.com> References: <20030409121537.36ba3fce.akpm@digeo.com> <200304092109.h39L9OV08801@verdi.et.tudelft.nl> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200304092109.h39L9OV08801@verdi.et.tudelft.nl> X-Burt-Line: Trees are cool. User-Agent: Mutt/1.5.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Apr 09, 2003 at 11:09:23PM +0200, Rob van Nieuwkerk wrote: > But a friend of mine uses O_DIRECT with 2.4 kernels to read *individual* > single harddisk sectors of 512 bytes ! He claims that my original > theory is the right one and that you can read 512 byte chunks on 512 > byte bounderies (he uses the complete device eg. /dev/hda). Well, how does your friend access /dev/hda? Is he using raw devices? Joel -- "What do you take me for, an idiot?" - General Charles de Gaulle, when a journalist asked him if he was happy. Joel Becker Senior Member of Technical Staff Oracle Corporation E-mail: joel.becker@oracle.com Phone: (650) 506-8127