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

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Message-ID: <20080904115052.GF20055@kernel.dk>
Date:	Thu, 4 Sep 2008 13:50:52 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, device@...ana.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: regarding major number of block extended devt

On Thu, Sep 04 2008, Tejun Heo wrote:
> 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?

Agree, that addition definitely makes sense.

-- 
Jens Axboe

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