linux-kernel - Re: [PATCH] xen-blkfront: save uncompleted reqs in blkfront

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Message-ID: <20160628195325.GA14723@char.us.oracle.com>
Date:	Tue, 28 Jun 2016 15:53:26 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Bob Liu <bob.liu@...cle.com>
Cc:	linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
	roger.pau@...rix.com
Subject: Re: [PATCH] xen-blkfront: save uncompleted reqs in blkfront_resume()

On Mon, Jun 27, 2016 at 04:33:24PM +0800, Bob Liu wrote:
> Uncompleted reqs used to be 'saved and resubmitted' in blkfront_recover() during
> migration, but that's too later after multi-queue introduced.
> 
> After a migrate to another host (which may not have multiqueue support), the
> number of rings (block hardware queues) may be changed and the ring and shadow
> structure will also be reallocated.
> So that blkfront_recover() can't 'save and resubmit' the real uncompleted reqs
> because shadow structure has been reallocated.
> 
> This patch fixes this issue by moving the 'save and resubmit' logic out of
> blkfront_recover() to earlier place:blkfront_resume().
> 
> Signed-off-by: Bob Liu <bob.liu@...cle.com>

Ack-ed and Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>

Let me run it through some tests and if no regressions found I will 
ask Jens to pull it.