linux-kernel - Re: [PATCH] xen-blkfront: remove type check from blkfront_setup

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Message-ID: <20140110213746.GA933@aepfle.de>
Date:	Fri, 10 Jan 2014 22:37:46 +0100
From:	Olaf Hering <olaf@...fle.de>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:	konrad.wilk@...cle.com, xen-devel@...ts.xen.org,
	linux-kernel@...r.kernel.org, david.vrabel@...rix.com
Subject: Re: [PATCH] xen-blkfront: remove type check from
 blkfront_setup_discard

On Fri, Jan 10, Boris Ostrovsky wrote:

> If the call below fails, is it safe to continue using discard feature? At
> the least, are discard_granularity and discard_alignment guaranteed to have
> sane/safe values?

Its up to the toolstack to provide sane values. In the worst case
discard fails. In this specific case the three values are optional, so
the calls can fail. I do not know what happens if the backend device
actually needs the values, but the frontend can not send proper discard
requests. Hopefully it will not damage the hardware..

Olaf
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