Open Stack

Hi cinder team:
We met a problem about backup create recently.

The backup can be created from volumes or snapshots. In the both cases, the
volume' s status is set to 'backing-up'.

But as I know, when users create backup with snapshots, the volume is not
used(Correct me if I'm wrong). So why the volume's status is changed ?
Should it keep available? It's a little strange that the volume is
"backing-up" but actually only the snapshot is used for backup creation.
the volume in "backing-up" means that it can't be used for some other
actions. Such as: attach, delete, export to image, extend, create from
volume, create backup from volume and so on.

So is there any reason we changed the volume' status here? Or is there any
third part driver need the volume's status must be "backing-up" when create
backup from snapshots?

Thanks!
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