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

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Date:	Tue, 25 Mar 2008 16:22:52 -0700
From:	Greg KH <gregkh@...e.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Randy Dunlap <randy.dunlap@...cle.com>, Mark Lord <lkml@....ca>,
	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 ?

On Tue, Mar 25, 2008 at 04:05:32PM -0700, H. Peter Anvin wrote:
>> How does this have anything to do with boot times?  Do you really have a
>> foolish shell script that iteratorates over every single disk in the
>> sysfs tree for every disk?  What does it do that for?
>
> Any time you want to get the sysfs information for a filesystem which is 
> already mounted, that's what you're forced to do.
>
>> I thought we were talking about 2TB disks here, with a proposed new
>> ioctl, not foolishness of boot scripts...
>
> I pointed out that having a way to map device numbers to sysfs directories 
> would have the same effect, *and* would be usable for other purposes.  I'd 
> rather see that than a new ioctl, and another, and another...

Again, a simple udev rule will give you that today if you really want
it...

And I think 'udevinfo' can be used to retrieve this information as well.

thanks,

greg k-h
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