linux-kernel - Re: [PATCHSET] libata: implement ->set

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Date:	Thu, 13 May 2010 18:54:47 +0200
From:	Tejun Heo <tj@...nel.org>
To:	James Bottomley <James.Bottomley@...e.de>
CC:	jeff@...zik.org, linux-ide@...r.kernel.org, jens.axboe@...cle.com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	ben@...adent.org.uk
Subject: Re: [PATCHSET] libata: implement ->set_capacity()

Hello,

On 05/13/2010 06:38 PM, James Bottomley wrote:
> Instead of making this a block sysfs attribute, since HPA is SATA only,
> why not make it a libata attribute for the disk?
> 
> That way on unlock, you can unlock the HPA and then trigger a partition
> rescan of the block device (BLKRRPART) ... this is an ioctl, so you need
> user context, but you have it if you do it from the sysfs write routine.
> This looks to be a lot simpler than threading it up through SCSI and
> block.

This doesn't have anything to do with sysfs.  It's called from block
partition scan code when it detects a partition extends beyond the end
of the device.  No user intervention at all and the mechanism has been
there for quite some years and possibly predates sysfs.  Am I being
really slow or are you looking at something else?

Thanks.

-- 
tejun
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