Comment 2 for bug 1670541

Reviewed: https://review.openstack.org/442241
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=d304f621c23c81580fbddaf61e61ef135558acd4
Submitter: Jenkins
Branch: master

commit d304f621c23c81580fbddaf61e61ef135558acd4
Author: wangxiyuan <email address hidden>
Date: Tue Mar 7 10:42:02 2017 +0800

    Don't change volume's status when create backups from snapshots

    when users try to create a backup from a snapshot, the volume
    related to the snapshot is set to backing-up during the action
    and can't be used for other actions.
    When create a backup from a large snapshot, such as larger
    than 1 TB, it will cost few hours generally. It's really a
    problem that the volume is not available for such a long time.

    If the snapshot is provided, we change the status of the snapshot;
    otherwise, we change the status of the volume as usual.

    This patch added "backing-up" status for snapshot as well

    DocImpact

    Change-Id: I86d34c470fabbf4132b5e004d9f368e751c893a5
    Closes-bug: #1670541