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Re: [Qemu-devel] Is qemu-img amend an atomic operation?


From: Kevin Wolf
Subject: Re: [Qemu-devel] Is qemu-img amend an atomic operation?
Date: Mon, 19 Dec 2016 14:10:22 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

Am 19.12.2016 um 13:49 hat Maor Lipchuk geschrieben:
> 
> On Mon, Dec 19, 2016 at 2:47 PM, Maor Lipchuk <address@hidden> wrote:
> 
>     Hi All,
> 
>     Does amend considered as an atomic operation or should we mark a volume as
>     ILLEGAL once the amend operation fails?
> 
>     also, if I call amend, but downgrade the QCOW volume compatibility level
>     from 1.1 to 0.10, is that atomic as well (or not, based on the answer on
>     the previous question)?
> 
>     Regards,
>     Maor
> 
> Adding also Nir and Kevin to the thread.

Like with every other operation, the image is supposed to stay
consistent at all times, even if the host crashes in the middle.
Leaked clusters are the worst that should be possible, anything
else would be a bug.

Kevin



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