Re: [Qemu-devel] [Bug 611640] [NEW] snapshot mode is broken for raw images

[Markus Armbruster]

Victor Shkamerda <address@hidden> writes:

> Public bug reported:
>
> The snapshot mode is not working if you use raw format for image instead
> of qcow2. Create a raw disk image by running "dd of=xxx.img bs=1 count=0
> seek=8G". Then run "qemu -snapshot xxx.img". In monitor console run
> "info block". There should be qcow2 temporary image backed by the raw
> image. Now run "commit ide0-hd0" and after that again "info block". You
> should see now that there is no more image, so any operations on it will
> fail form now on. This is for latest HEAD in git.
>
> ** Affects: qemu
>      Importance: Undecided
>          Status: New

git bisect points to

commit c33491978c5c4c746cc0272d5f2df50aa14d1f02
Author: Kevin Wolf <address@hidden>
Date:   Thu May 6 16:34:56 2010 +0200

    block: Fix bdrv_commit
    
    When reopening the image, don't guess the driver, but use the same driver as
    was used before. This is important if the format=... option was used for 
that
    image.