linux-kernel - Re: [PATCH resubmit] xen-blkfront: Don't send closing notification to backend in blkfront

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Date:	Fri, 15 Jul 2011 15:58:50 +0800
From:	Joe Jin <joe.jin@...cle.com>
To:	Ian Campbell <Ian.Campbell@...citrix.com>
CC:	Daniel Stodden <Daniel.Stodden@...rix.com>,
	Jens Axboe <jaxboe@...ionio.com>,
	"annie.li@...cle.com" <annie.li@...cle.com>,
	Jeremy Fitzhardinge <Jeremy.Fitzhardinge@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Kurt C Hackel <KURT.HACKEL@...cle.com>,
	Greg Marsden <greg.marsden@...cle.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...nel.org" <stable@...nel.org>
Subject: Re: [PATCH resubmit] xen-blkfront: Don't send closing  notification
 to backend in blkfront_closing()

On 07/14/11 17:12, Ian Campbell wrote:
> On Thu, 2011-07-14 at 09:55 +0100, Joe Jin wrote:
>> On 07/14/11 16:13, Ian Campbell wrote:
>>> On Wed, 2011-07-13 at 01:47 +0100, Joe Jin wrote:
> 
>>>
>>> I'm wondering if we might not be better off deferring the disconnect on
>>> the backend side until the frontend enters XenbusStateClosed instead of
>>> doing it in closing.
>>
>> Yes this fix from backend side works too, also this looks reasonable than 
>> fix in frontend.
> 
> I guess there is either a missing "more" or "less" in that sentence ;-)
> 
> The nice thing about a backend fix is that you don't need to go round
> propagating the fix into distros etc and updating existing deployed
> guests (not to mention non-Linux frontends).

Indeed ;)

> 
> I actually thought blkback had something like this already in older
> "classic" Xen kernels but it seems like the patch never made it out of
> the XCP patch queue :-(. See
> http://xenbits.xen.org/hg/XCP/linux-2.6.32.pq.hg/file/tip/CA-7672-blkback-shutdown.patch
> (which appears to also incorporate a toolstack directed graceful
> shutdown of some sort as well as deferring the device close).
> 
> Daniel, do you know of any plans to extricate that stuff from the XCP
> patch queue for upstream? Are there any other patches (e.g. incremental
> fixes) in that pq which should go along with it?

Looking forward push this patch to upstream!

Joe 

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