linux-kernel - Re: What to do about the 2TB limit on HDIO

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Date:	Thu, 27 Mar 2008 11:55:23 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Kay Sievers <kay.sievers@...y.org>
CC:	Mark Lord <lkml@....ca>, Greg KH <gregkh@...e.de>,
	Jens Axboe <axboe@...nel.dk>, Jeff Garzik <jgarzik@...ox.com>,
	Tejun Heo <htejun@...il.com>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	IDE/ATA development list <linux-ide@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: What to do about the 2TB limit on HDIO_GETGEO ?

Kay Sievers wrote:
>>
>>  And it's not just a few 10s of lines of code currently,
>>  but rather about 80-100 lines just to find the correct device subdir,
>>  and *then* a few more 10s of lines of code to retrieve the value.
> 
> Hmm, 100 lines? What else do you need?
> 
>   $ grep -l 8:3 /sys/class/block/*/dev
>   /sys/class/block/sdc/dev
> 

That's particularly funny, because your very own example gives the wrong 
result -- sdc is 8:32 not 8:3 (which is sdc3, which is also excluded by 
your search.)

Not to mention the fact that it is still O(n).

	-hpa
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