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From: Wen Congyang <wency@cn.fujitsu.com>
Message-ID: <562DD583.30707@cn.fujitsu.com>
Date: Mon, 26 Oct 2015 15:25:55 +0800
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Subject: Re: [Qemu-devel] [Qemu-block] Dynamic reconfiguration
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To: Markus Armbruster <armbru@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, zhanghailiang <zhang.zhanghailiang@huawei.com>, qemu block <qemu-block@nongnu.org>, Jiang Yunhong <yunhong.jiang@intel.com>, Dong Eddie <eddie.dong@intel.com>, qemu devel <qemu-devel@nongnu.org>, Max Reitz <mreitz@redhat.com>, Gonglei <arei.gonglei@huawei.com>, Stefan Hajnoczi <stefanha@redhat.com>, Yang Hongyang <yanghy@cn.fujitsu.com>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>

On 10/26/2015 03:24 PM, Markus Armbruster wrote:
> Wen Congyang <wency@cn.fujitsu.com> writes:
> 
>> On 10/21/2015 04:27 PM, Markus Armbruster wrote:
> [...]
>>> Can we phrase the operation differently?  Instead of "insert between A
>>> and B (silently replacing everything that is now between A and B)",
>>> say one of
>>>
>>> 1a. Replace node A by A <- blkdebug
>>>
>>> 1b. Replace node B by blkdebug <- B
>>>
>>> 2a. Replace edge A <- B by <- blkdebug <-
>>>     Impossible in the current state, because there is no such edge.
>>
>> What does 'edge' mean?
> 
> It's graph terminology: the BB and BDS serve as the graph's nodes
> (a.k.a. vertices), and the pointers connecting them serve as the graph's
> edges.

Thanks

Wen Congyang

> 
> [...]
> .
>