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[Qemu-block] ping Re: [Qemu-devel] [PATCH 4/6] dirty-bitmaps: clean-up b
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[Qemu-block] ping Re: [Qemu-devel] [PATCH 4/6] dirty-bitmaps: clean-up bitmaps loading and migration logic |
Date: |
Mon, 15 Oct 2018 09:42:46 +0000 |
ping
18.09.2018 13:37, Vladimir Sementsov-Ogievskiy wrote:
> 17.09.2018 21:33, John Snow wrote:
>>
>> On 09/17/2018 11:51 AM, Vladimir Sementsov-Ogievskiy wrote:
>>> Hmm, ping, anybody here ?)
>>>
>> Was preparing to stage on Friday, working on it now.
>>
>> I never understood why you forbid the transfer of read only bitmaps
>> though, can you point that out for me?
>>
>> --js
>
> readonly bitmap - means it is not marked in_use in qcow2 file.
>
> Hm, I don't remember exact reason, but at least for shared migration
> it is unsafe to migrate readonly bitmap without special handling: we
> migrate it, it becomes not-readonly, it changes in RAM, then (assume)
> storing failed and we have old version ofthe bitmap in qcow2, which is
> not marked in_use.. So it should be somehow carefully handled, the
> simplest option is just to forbid it.
>
--
Best regards,
Vladimir
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Vladimir Sementsov-Ogievskiy <=