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

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Date:	Mon, 13 Jan 2014 13:40:29 +0100
From:	Olaf Hering <olaf@...fle.de>
To:	Jan Beulich <JBeulich@...e.com>
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 Mon, Jan 13, 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.

In this case my first patch is correct and should be used.

Olaf
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