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Re: [Qemu-devel] [PATCH] proto: add 'shift' extension.


From: Denis V. Lunev
Subject: Re: [Qemu-devel] [PATCH] proto: add 'shift' extension.
Date: Tue, 27 Sep 2016 16:46:29 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0

On 09/27/2016 03:07 PM, Paolo Bonzini wrote:
>
> ----- Original Message -----
>> From: "Denis V. Lunev" <address@hidden>
>> To: "Paolo Bonzini" <address@hidden>
>> Cc: "Vladimir Sementsov-Ogievskiy" <address@hidden>, address@hidden, 
>> address@hidden,
>> address@hidden, address@hidden, address@hidden, address@hidden, 
>> address@hidden,
>> address@hidden
>> Sent: Tuesday, September 27, 2016 12:25:54 PM
>> Subject: Re: [PATCH] proto: add 'shift' extension.
>>
>> On 09/27/2016 01:15 PM, Paolo Bonzini wrote:
>>>> We could go in a different direction and export flag
>>>> 'has_zero_init' which will report that the storage is
>>>> initialized with all zeroes at the moment. In this
>>>> case mirroring code will not fall into this
>>>> branch.
>>> Why don't you add the zero_init flag to QEMU's NBD driver instead?
>> for all cases without knowing real backend on the server side?
>> I think this would be wrong.
> Add it to the command line, and leave it to libvirt or the user to
> pass "-drive file.driver=nbd,...,file.zero-init=on".
>
> Paolo
this specifically means that all QMP commands like 'drive-backup' and
'drive-mirror' will have to be modified to pass this attribute. If this is
OK, we can proceed with that.

Den



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