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

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Message-ID: <48BF2AEB.1050508@kernel.org>
Date:	Thu, 04 Sep 2008 02:25:15 +0200
From:	Tejun Heo <tj@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
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

Hello,

H. Peter Anvin wrote:
> Thinking about it some more, one invariant this is *guaranteed* to
> violate is:
> 
>     partition_number = partition_device - master_device
> 
> Code that needs a partition number (which is common enough) are using
> this invariant, because (a) it has held for 17 years and (b) because
> there is still no alternative other that relying on fragile naming
> scheme hacks.
> 
> (a) we can't do anything about, but (b) we can, by introducing a
> partition number attribute in sysfs.

Yeah, that would certainly be a nice addition.  Also, if partitions
are made proper classes, they'll be easily enumerable by
/sys/block/*/partitions/*.

Jens, what do you think?

-- 
tejun
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