linux-kernel - Re: [Xen-devel] [PATCH v2] xen-blkfront: remove type check from blkfront_setup

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Date:	Mon, 13 Jan 2014 12:34:23 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Olaf Hering" <olaf@...fle.de>
Cc:	<david.vrabel@...rix.com>, <xen-devel@...ts.xen.org>,
	<boris.ostrovsky@...cle.com>, <konrad.wilk@...cle.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH v2] xen-blkfront: remove type check
 from blkfront_setup_discard

>>> On 13.01.14 at 13:01, Olaf Hering <olaf@...fle.de> wrote:
> On Mon, Jan 13, Jan Beulich wrote:
> 
>> You can't do this in one go - the first two and the last one may be
>> set independently (and are independent in their meaning), and
>> hence need to be queried independently (xenbus_gather() fails
>> on the first absent value).
> 
> Yes, thats the purpose. Since the properties are required its an all or
> nothing thing. If they are truly optional then blkif.h should be updated
> to say that.

They _are_ optional.

Jan

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