linux-kernel - Re: regarding major number of block extended devt

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Message-ID: <48BEBAF0.7070008@zytor.com>
Date:	Wed, 03 Sep 2008 09:27:28 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Tejun Heo <tj@...nel.org>
CC:	device@...ana.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: regarding major number of block extended devt

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
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