linux-kernel - Re: [PATCH 1/3] ide: add "ignore

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Message-ID: <20090526135343.5bcaa92b@lxorguk.ukuu.org.uk>
Date:	Tue, 26 May 2009 13:53:43 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	Frans Pop <elendil@...net.nl>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] ide: add "ignore_hpa" module parameter

> Please note that no fancy sysfs support was needed to prevent the problem:
> both stacks (ide & libata) support HDIO_DRIVE_TASK ioctl which can be used
> to execute commands needed to retrieve/change HPA setting.

Wrong. You need sysfs support because you may not be able to retrieve the
HPA settings after the drive has removed them. You also need a trigger of
some form because the block layer needs to see the volume resized and it
doesn't snoop the innards of the ATA command structure.
 
> Moreover the (much needed) work from Tejun doesn't help a tiny bit in case
> of people migrating their *working* setups from IDE to libata (at least
> in distro upgrade case this could have been handled by distro installer but
> see above) and hitting the compatibility issue mentioned in bug #13365.

Fedora handled it with clear documentation at the time. I'm not sure how
other distros handled it back then but given the patch was written by
Ubuntu folk I suspect they knew about it too 8)
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