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

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Message-ID: <1389618054.13654.57.camel@kazak.uk.xensource.com>
Date:	Mon, 13 Jan 2014 13:00:54 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Jan Beulich <JBeulich@...e.com>
CC:	Olaf Hering <olaf@...fle.de>, <linux-kernel@...r.kernel.org>,
	<boris.ostrovsky@...cle.com>, <david.vrabel@...rix.com>,
	<xen-devel@...ts.xen.org>
Subject: Re: [Xen-devel] [PATCH v2] xen-blkfront: remove type check from
 blkfront_setup_discard

On Mon, 2014-01-13 at 12:34 +0000, Jan Beulich wrote:
> >>> 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.

But is it true that either they are all present or they are all absent?

Ian.


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