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Re: [Qemu-block] [PATCH v10 08/10] Implement new driver for block replic


From: Wen Congyang
Subject: Re: [Qemu-block] [PATCH v10 08/10] Implement new driver for block replication
Date: Tue, 13 Oct 2015 17:08:17 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0

On 10/13/2015 12:27 AM, Stefan Hajnoczi wrote:
> On Fri, Sep 25, 2015 at 02:17:36PM +0800, Wen Congyang wrote:
>> +        /* start backup job now */
>> +        bdrv_op_unblock(s->hidden_disk, BLOCK_OP_TYPE_BACKUP_TARGET,
>> +                        s->active_disk->backing_blocker);
>> +        bdrv_op_unblock(s->secondary_disk, BLOCK_OP_TYPE_BACKUP_SOURCE,
>> +                        s->hidden_disk->backing_blocker);
> 
> Why is it safe to unblock these operations?
> 
> Why do they have to be blocked for non-replication users?

hidden_disk and secondary disk are opened as backing file, so it is blocked for
non-replication users.
What can I do if I don't unblock it and want to do backup?

Thanks
Wen Congyang

> 
> Stefan
> .
> 




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