Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756862AbZAAO2Z (ORCPT ); Thu, 1 Jan 2009 09:28:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756193AbZAAO2N (ORCPT ); Thu, 1 Jan 2009 09:28:13 -0500 Received: from palinux.external.hp.com ([192.25.206.14]:60299 "EHLO mail.parisc-linux.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756148AbZAAO2M (ORCPT ); Thu, 1 Jan 2009 09:28:12 -0500 Date: Thu, 1 Jan 2009 07:28:10 -0700 From: Matthew Wilcox To: Benny Halevy Cc: Jeff Garzik , James Bottomley , open-osd development , Boaz Harrosh , linux-scsi , linux-kernel@vger.kernel.org, avishay@gmail.com, viro@ZenIV.linux.org.uk, linux-fsdevel@vger.kernel.org, Andrew Morton Subject: Re: [osd-dev] [PATCH 7/9] exofs: mkexofs Message-ID: <20090101142810.GN2002@parisc-linux.org> References: <4947BFAA.4030208@panasas.com> <4947CA5C.50104@panasas.com> <20081229121423.efde9d06.akpm@linux-foundation.org> <495B8D90.1090004@panasas.com> <1230739053.3408.74.camel@localhost.localdomain> <495C8B65.4010202@panasas.com> <495C92C8.5040702@garzik.org> <495CD1C4.1030605@panasas.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <495CD1C4.1030605@panasas.com> User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1219 Lines: 25 On Thu, Jan 01, 2009 at 04:23:00PM +0200, Benny Halevy wrote: > Personally, I'm not sure if maintaining that intimate knowledge in a > user space program is an ideal model with respect to keeping both > in sync, avoiding code duplication, and dealing with upgrade issues > (e.g. upgrading the kernel and not the user space utils) The other 30-40 filesystems that Linux supports manage to do it this way. I'm not sure why osdfs is different in this regard. You need to be careful with the filesystem layout anyway -- when you upgrade the kernel, it still needs to be able to access all the files contained in existing filesystems. And it needs to create new files which are still readable by older kernels (users have this pesky habit of downgrading). -- Matthew Wilcox Intel Open Source Technology Centre "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step." -- 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/