From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: [Ext2-devel] [RFC 0/13] extents and 48bit ext3 Date: Fri, 09 Jun 2006 12:37:09 -0400 Message-ID: <4489A3B5.501@garzik.org> References: <1149816055.4066.60.camel@dyn9047017069.beaverton.ibm.com> <20060609091327.GA3679@infradead.org> <44898476.80401@garzik.org> <4489874C.1020108@garzik.org> <44899113.3070509@garzik.org> <170fa0d20606090921x71719ad3m7f9387ba15413b8f@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Mike Snitzer , Christoph Hellwig , Mingming Cao , linux-kernel@vger.kernel.org, ext2-devel , linux-fsdevel@vger.kernel.org Return-path: Received: from srv5.dvmed.net ([207.36.208.214]:51599 "EHLO mail.dvmed.net") by vger.kernel.org with ESMTP id S965280AbWFIQhO (ORCPT ); Fri, 9 Jun 2006 12:37:14 -0400 To: Alex Tomas In-Reply-To: Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org Alex Tomas wrote: >>>>>> Mike Snitzer (MS) writes: > > MS> precludes their ability to boot older kernels (steps can be taken to > MS> make them well aware of this). The "real world situation" you refer > MS> to, while hypothetically valid, isn't something informed > MS> ext3-with-extents users will _ever_ elect to do. > > one who needs/wants to go back may get rid of extents by: > a) remounting w/o extents option > b) copying new-fashion-style files so that copies use blockmap > c) dropping extents feature in superblock More likely, they will just backup+restore rather than go through all that. After leafing through a 50-page manual to match up kernel versions with ext3 features, to see which older kernels will (or won't) require all this work. Jeff