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

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Message-ID: <1389620093.13654.58.camel@kazak.uk.xensource.com>
Date:	Mon, 13 Jan 2014 13:34:53 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Jan Beulich <JBeulich@...e.com>
CC:	Olaf Hering <olaf@...fle.de>, <david.vrabel@...rix.com>,
	<xen-devel@...ts.xen.org>, <boris.ostrovsky@...cle.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH v2] xen-blkfront: remove type check from
 blkfront_setup_discard

On Mon, 2014-01-13 at 13:16 +0000, Jan Beulich wrote:
> >>> On 13.01.14 at 14:00, Ian Campbell <Ian.Campbell@...rix.com> wrote:
> > 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?
> 
> No, it's not. discard-secure is independent of the other two (but
> those other two are tied together).

Thanks for clarifying.


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