Re: [Qemu-devel] qcow2 snapshot + resize

[Max Reitz]

On 06.01.2016 17:28, Eric Blake wrote:
> On 01/06/2016 09:20 AM, Max Reitz wrote:
> 
>>> If I take a snapshot while the guest sees a 1G disk, then resize the
>>> disk to 2G, then roll back to the point in time of the snapshot, I'd
>>> expect the disk to roll back to 1G in size.  Anything else is likely to
>>> confuse the guest.  And that's what current resize support already does
>>> (it only resizes the active image, not the snapshots).
>>
>> No, the current resize operation just refuses to resize the image if it
>> has any snapshots. Snapshots currently do not store the size of the
>> image when they were created.
> 
> Huh? I thought that we specifically added bytes 48-55 per snapshot entry
> in the qcow2v3 description specifically so that internal snapshots DO
> record the size of the image when the snapshot was created.

Oh, you're right! Well, then that was probably the intention, yes.
However, resizing an image with snapshots will still fail.

Max

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