Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261151AbTIEAuH (ORCPT ); Thu, 4 Sep 2003 20:50:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261367AbTIEAuH (ORCPT ); Thu, 4 Sep 2003 20:50:07 -0400 Received: from fw.osdl.org ([65.172.181.6]:63373 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S261151AbTIEAuD (ORCPT ); Thu, 4 Sep 2003 20:50:03 -0400 Date: Thu, 4 Sep 2003 17:49:51 -0700 (PDT) From: Linus Torvalds To: Daniel Phillips cc: James Bottomley , Jamie Lokier , Linux Kernel Subject: Re: [PATCH] fix remap of shared read only mappings In-Reply-To: <200309050249.21152.phillips@arcor.de> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 835 Lines: 23 On Fri, 5 Sep 2003, Daniel Phillips wrote: > > This an interesting tidbit, as I'm busy working on a DFS mmap for OpenGFS, and > I want to be sure I'm implementing true-blue Posix semantics. Please don't. POSIX semantics are weak enough not to be interesting. Exactly because a number of old hardware platforms simply _cannot_ give you good coherency. And a number of old UNIXes couldn't either, for that matter. What really matters is that mmap() under Linux is 100% coherent, as far as the hardware just allows. We haven't taken the easy way out. We shouldn't start now. Linus - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/