From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: [PATCH]: Support dynamic resizing of vbds
Date: Thu, 11 Mar 2010 15:13:38 -0800
Message-ID: <4B997922.1080407@goop.org>
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To: Ky Srinivasan <ksrinivasan@novell.com>
Cc: James Harper <james.harper@bendigoit.com.au>, xen-devel@lists.xensource.com
List-Id: xen-devel@lists.xenproject.org

On 03/11/2010 02:01 PM, Ky Srinivasan wrote:
>
>   =20
>>>> On 3/11/2010 at  4:44 PM, in message<4B996436.1000600@goop.org>, Jer=
emy
>>>>         =20
> Fitzhardinge<jeremy@goop.org>  wrote:
>   =20
>> On 03/11/2010 12:15 PM, Pasi K=C3=A4rkk=C3=A4inen wrote:
>>     =20
>>> On Tue, Mar 09, 2010 at 01:39:23PM -0700, Ky Srinivasan wrote:
>>>
>>>       =20
>>>>
>>>>         =20
>>>>>>> On 3/9/2010 at  3:35 PM, in message<20100309203557.GJ1878@reaktio=
.net>, Pasi
>>>>>>>
>>>>>>>               =20
>>>> K=C3=A4rkk=C3=A4inen<pasik@iki.fi>   wrote:
>>>>
>>>>         =20
>>>>> On Tue, Mar 09, 2010 at 01:31:17PM -0700, Ky Srinivasan wrote:
>>>>>
>>>>>           =20
>>>>>>
>>>>>>             =20
>>>>>>>>> On 3/9/2010 at  3:15 PM, in message<20100309201529.GH1878@reakt=
io.net>, Pasi
>>>>>>>>>
>>>>>>>>>                   =20
>>>>>> K=C3=A4rkk=C3=A4inen<pasik@iki.fi>   wrote:
>>>>>>
>>>>>>             =20
>>>>>>> On Tue, Mar 09, 2010 at 12:56:11PM -0700, Ky Srinivasan wrote:
>>>>>>>
>>>>>>>               =20
>>>>>>>> The attached patch supports dynamic resizing of vbds.
>>>>>>>>
>>>>>>>>
>>>>>>>>                 =20
>>>>>>> Nice! Did you also implement the xm/xend side of resizing?
>>>>>>>
>>>>>>>               =20
>>>>>> My goal was to not have the end-user do anything other than what
>>>>>> was minimally required to  resizing the device on the host side.
>>>>>> Once the device is resized on the host side, this capacity change
>>>>>> is propagated to the guest without having to invoke any xm command=
.
>>>>>>
>>>>>>
>>>>>>             =20
>>>>> Oh, even better!
>>>>> What version of the kernel did you test with? 2.6.27?
>>>>>
>>>>>           =20
>>>> I tested this on 2.6.32. The patches should apply to earlier kernels=
 without
>>>>         =20
>> too much trouble.
>>     =20
>>>>
>>>>         =20
>>> Great!
>>>
>>> Jeremy: Hopefully you can add this patch to your tree.
>>>
>>>       =20
>> It applied fairly cleanly, but I haven't tested it yet.  Ky, by 2.6.32=
 I
>> assume I mean your one, not pvops? (Because your patch is touching
>> blkfront in the wrong place.)
>>     =20
> Yes. This patch was against our sles11 sp1.
>   =20

What happens if the frontend doesn't support the resize, and the device=20
shrinks?  Will the backend just raise IO errors for out of range requests=
?

     J