Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763268AbYBMCKb (ORCPT ); Tue, 12 Feb 2008 21:10:31 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754112AbYBMCKR (ORCPT ); Tue, 12 Feb 2008 21:10:17 -0500 Received: from srv5.dvmed.net ([207.36.208.214]:41198 "EHLO mail.dvmed.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753600AbYBMCKP (ORCPT ); Tue, 12 Feb 2008 21:10:15 -0500 Message-ID: <47B2517E.3080606@garzik.org> Date: Tue, 12 Feb 2008 21:10:06 -0500 From: Jeff Garzik User-Agent: Thunderbird 2.0.0.9 (X11/20071115) MIME-Version: 1.0 To: David Miller CC: chris.mason@oracle.com, jengelh@computergmbh.de, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, btrfs-devel@oss.oracle.com Subject: Re: BTRFS partition usage... References: <200802120849.34477.chris.mason@oracle.com> <200802120908.59602.chris.mason@oracle.com> <20080212.153329.98384016.davem@davemloft.net> In-Reply-To: <20080212.153329.98384016.davem@davemloft.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: -4.3 (----) X-Spam-Report: SpamAssassin version 3.2.3 on srv5.dvmed.net summary: Content analysis details: (-4.3 points, 5.0 required) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1065 Lines: 28 David Miller wrote: > From: Chris Mason > Date: Tue, 12 Feb 2008 09:08:59 -0500 > >> I've had requests to move the super down to 64k to make room for >> bootloaders, which may not matter for sparc, but I don't really plan >> on different locations for different arches. > > The Sun disk label sits in the first 512 bytes and the boot loader > block sits in the second 512 bytes. > > I think leaving even more space is a good idea for several reasons. Yep. I chose 32K unused space in the prototype filesystem I wrote [1, 2.4 era]. I'm pretty sure I got that number from some other filesystem, maybe even some NTFS incarnation. It's just good practice to avoid the first and last "chunks" of a partition, FSVO chunk. Jeff [1] http://kernel.org/pub/linux/kernel/people/jgarzik/ibu/ -- 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/