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Date: Tue, 11 Sep 2018 16:26:40 +0800
From: Fam Zheng <famz@redhat.com>
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	<20180907161520.26349-9-kwolf@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 08/14] block-backend: Add .drained_poll
 callback
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To: Kevin Wolf <kwolf@redhat.com>
Cc: qemu-block@nongnu.org, mreitz@redhat.com, pbonzini@redhat.com, slp@redhat.com, qemu-devel@nongnu.org

On Fri, 09/07 18:15, Kevin Wolf wrote:
> A bdrv_drain operation must ensure that all parents are quiesced, this
> includes BlockBackends. Otherwise, callbacks called by requests that are
> completed on the BDS layer, but not quite yet on the BlockBackend layer
> could still create new requests.
> 
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>

Reviewed-by: Fam Zheng <famz@redhat.com>