From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1765229AbYBMBHo (ORCPT ); Tue, 12 Feb 2008 20:07:44 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753059AbYBMBHd (ORCPT ); Tue, 12 Feb 2008 20:07:33 -0500 Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:59845 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752562AbYBMBHb (ORCPT ); Tue, 12 Feb 2008 20:07:31 -0500 Date: Tue, 12 Feb 2008 17:08:03 -0800 (PST) Message-Id: <20080212.170803.205678080.davem@davemloft.net> To: jengelh@computergmbh.de Cc: chris.mason@oracle.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, btrfs-devel@oss.oracle.com Subject: Re: BTRFS partition usage... From: David Miller In-Reply-To: References: <20080212.152652.217936905.davem@davemloft.net> X-Mailer: Mew version 5.2 on Emacs 22.1 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jan Engelhardt Date: Wed, 13 Feb 2008 00:39:16 +0100 (CET) > On the other hand, the H and S of CHS could be lowered and S increased, > e.g. divide H by 2, divide S by 2, multiply S by 4. This gives a finer > bytes/cylinder granularity. That's really not an option when you only have 16-bits in the disk label for some of these values, which is the case for Sun disk labels and some others (f.e. BSD). Jan, please get past this, it's a real issue and we therefore have to skip the initial 1K or so in order to provide something even approaching sane. No modern filesystem should put it's superblock at position zero.