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Re: [Qemu-devel] [PATCH] more check for replaced node
From: |
Wen Congyang |
Subject: |
Re: [Qemu-devel] [PATCH] more check for replaced node |
Date: |
Mon, 13 Jul 2015 10:41:53 +0800 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 |
On 07/02/2015 10:48 PM, Stefan Hajnoczi wrote:
> On Wed, Jul 01, 2015 at 04:49:40PM +0800, Wen Congyang wrote:
>> On 07/01/2015 04:39 PM, Stefan Hajnoczi wrote:
>>> On Thu, Jun 25, 2015 at 02:55:10PM +0800, Wen Congyang wrote:
>>>> Signed-off-by: Wen Congyang <address@hidden>
>>>> ---
>>>> block.c | 5 +++--
>>>> block/mirror.c | 3 ++-
>>>> blockdev.c | 2 +-
>>>> include/block/block.h | 3 ++-
>>>> 4 files changed, 8 insertions(+), 5 deletions(-)
>>>
>>> This patch is missing a commit description. What is the justification
>>> for this change?
>>
>> Sorry, I forgot to add commit messages..
>>
>> Without this patch, the replace node can be any node, and it can be
>> top BDS with BB, or another quorum's child. With this patch, the replace node
>> must be this quorum's child.
>
> I think the point of the replace operation was to swap a quorum child
> with a new drive. It sounds like this patch will break that use case?
>
> The idea was that a failed child needs to be replaced. The user adds a
> new -drive and then uses the mirror+replace to include it into the
> quorum. I think the new child is not be part of the quorum BDS graph
> until replacement occurs.
bs/s->common.bs is quorum, and to_replace is the broken child.
The new child is target_bs. With this patch, we just check if
the broken child is part of the quorum BDS.
Do I misunderstand something?
Thanks
Wen Congyang
>
> Stefan
>