From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754363AbYICQ2X (ORCPT ); Wed, 3 Sep 2008 12:28:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753527AbYICQ2I (ORCPT ); Wed, 3 Sep 2008 12:28:08 -0400 Received: from terminus.zytor.com ([198.137.202.10]:59909 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753341AbYICQ2H (ORCPT ); Wed, 3 Sep 2008 12:28:07 -0400 Message-ID: <48BEBAF0.7070008@zytor.com> Date: Wed, 03 Sep 2008 09:27:28 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Tejun Heo CC: device@lanana.org, Linux Kernel Mailing List , Jens Axboe Subject: Re: regarding major number of block extended devt References: <48BD30F9.6080108@kernel.org> <48BD3313.7090906@kernel.org> <48BD9F36.8000704@zytor.com> <48BE0EDB.20107@kernel.org> <48BEB759.4050503@zytor.com> <48BEB98C.8030303@kernel.org> In-Reply-To: <48BEB98C.8030303@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Tejun Heo wrote: > H. Peter Anvin wrote: >> But just allocating a big bucket of device numbers and throw it all into >> a pot semirandomly is likely to cause more damage, not less. > > To use ext devt, the system has to use udev for device numbers. As long > as udev is used, the major number doesn't matter. I'm sorry, but that's simply false. There is a *lot* of code out there that assumes you can determine what the device is by correlating the major number with /proc/devices. -hpa