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[Xen-devel] Re: [PATCH resubmit] xen-blkfront: Don't send closing notifi

To: Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH resubmit] xen-blkfront: Don't send closing notification to backend in blkfront_closing()
From: Joe Jin <joe.jin@xxxxxxxxxx>
Date: Fri, 15 Jul 2011 15:58:50 +0800
Cc: Jeremy Fitzhardinge <Jeremy.Fitzhardinge@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Kurt C Hackel <KURT.HACKEL@xxxxxxxxxx>, Greg Marsden <greg.marsden@xxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "annie.li@xxxxxxxxxx" <annie.li@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jens Axboe <jaxboe@xxxxxxxxxxxx>, "stable@xxxxxxxxxx" <stable@xxxxxxxxxx>, Daniel Stodden <Daniel.Stodden@xxxxxxxxxx>
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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!


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