From: Eric Sandeen Subject: Re: [PATCH v1 00/30] Ext4 snapshots Date: Wed, 08 Jun 2011 09:41:33 -0500 Message-ID: <4DEF8A1D.2080707@redhat.com> References: <1307459283-22130-1-git-send-email-amir73il@users.sourceforge.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: Lukas Czerner , linux-ext4@vger.kernel.org, tytso@mit.edu, linux-kernel@vger.kernel.org To: "Amir G." Return-path: Received: from mx1.redhat.com ([209.132.183.28]:5595 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756084Ab1FHOlp (ORCPT ); Wed, 8 Jun 2011 10:41:45 -0400 In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-ID: On 6/8/11 9:04 AM, Amir G. wrote: >> And one last note, I also think that the snapshot format change in the >> > future, when we'll have snpashots with 64bit feature compatible seems >> > just wrong to me. Adding some features or changing the implementation a >> > bit is ok, but format change is different. When the code is upstream and >> > stable it is just wrong. > What can I say, I understand why it looks bad, but is 64bit code > upstream and stable? Hell no! e2fsprogs 64bit is not out yet! > There is no reason to call it 'format change'. > It's going to be a new format used only for 64bit fs, which are not > even out there yet. And when they are finally out there, they won't > have > snapshots until the new format is implemented. Well, the on-disk format for 64-bit (48-bit?) ext4 is there & fixed; it's just that there is no released userspace which can properly handle it, right? I don't anticipate ext4 format changes for >16T, or am I missing something? -Eric