From mboxrd@z Thu Jan 1 00:00:00 1970 From: Helge Hafting Subject: Re: [Ext2-devel] [RFC 0/13] extents and 48bit ext3 Date: Mon, 19 Jun 2006 09:48:30 +0200 Message-ID: <449656CE.9020401@aitel.hist.no> References: <1149816055.4066.60.camel@dyn9047017069.beaverton.ibm.com> <4488E1A4.20305@garzik.org> <20060609083523.GQ5964@schatzie.adilger.int> <44898EE3.6080903@garzik.org> <448992EB.5070405@garzik.org> <4489A7ED.8070007@garzik.org> <20060609195750.GD10524@thunk.org> <4489D55F.20103@garzik.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: Jeff Garzik , Theodore Tso , Andrew Morton , ext2-devel , linux-kernel@vger.kernel.org, Linus Torvalds , cmm@us.ibm.com, linux-fsdevel@vger.kernel.org, Andreas Dilger Return-path: Received: from embla.aitel.hist.no ([158.38.50.22]:56505 "HELO embla.aitel.hist.no") by vger.kernel.org with SMTP id S932219AbWFSHv6 (ORCPT ); Mon, 19 Jun 2006 03:51:58 -0400 To: Alex Tomas In-Reply-To: Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org Alex Tomas wrote: >>>>>> Jeff Garzik (JG) writes: >>>>>> > > JG> No, there is a key difference between ext3 and SCSI/etc.: cruft is removed. > > JG> In ext3, old formats are supported for all eternity. > > we'd need this anyway. just to let users to migrate. > Not really. Today, people use reiserfs even though they couldn't just remount their old ext2 as reiserfs. An ext2/ext3-incompatible ext4 isn't a problem. Sure, people will have to mkfs instead of just remounting, and that will mean fewer quick conversions in the short-term. But people using ext3 today don't really need ext4 - they are per definition running on sufficiently small disks/partitions. So an incompatible ext4 will still see use - on new filesystems mostly. Not a problem, people buy disks all the time. Helge Hafting