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

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Date:	Mon, 13 Jan 2014 13:45:56 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Jan Beulich <JBeulich@...e.com>
CC:	Ian Campbell <Ian.Campbell@...rix.com>,
	Olaf Hering <olaf@...fle.de>, <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 13/01/14 13:16, 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).

Can we have a patch to blkif.h that clarifies this?

e.g.,

feature-discard

   ...

   discard-granularity and discard-offset must also be present if
   feature-discard is enabled

   discard-secure may also be present if feature-discard is enabled.

David
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