linux-kernel - Re: [PATCHSET] block,scsi,libata: implement alt

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Message-ID: <49FA0349.3090706@garzik.org>
Date:	Thu, 30 Apr 2009 16:00:09 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Tejun Heo <tj@...nel.org>
CC:	linux-ide@...r.kernel.org, jens.axboe@...cle.com,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	James.Bottomley@...senPartnership.com, Mauelshagen@...Hat.com,
	dm-devel@...Hat.com
Subject: Re: [PATCHSET] block,scsi,libata: implement alt_size

Tejun Heo wrote:
> Hello,
> 
> Jeff Garzik wrote:
>> <shrug>  I suppose...
>>
>> It just seems like a nasty hack, but unfortunately I don't see
>> anyone stepping up to do it properly -- with a DM device
>> automatically layered on top that splits the device into separate
>> regions: one block device for the 'regular' area, and one for the
>> HPA.
> 
> Isn't that more hacky?  I don't know.  All that dm needs to know is
> the location of the metadata which is located w.r.t. the end of the
> device which might be at a different location if BIOS tried to pull
> silly stunts.  So, exporting the size BIOS might have used seems like
> a straight forward solution to me.

"<shrug> I suppose" is basically a reluctant ack, in the absence of 
other solutions :)


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