Comment 6 for bug 1185588

Reviewed: https://review.openstack.org/32767
Committed: http://github.com/openstack/nova/commit/69dd7c50a95518788018dd1cb8aad60029fdac42
Submitter: Jenkins
Branch: stable/grizzly

commit 69dd7c50a95518788018dd1cb8aad60029fdac42
Author: Rafi Khardalian <email address hidden>
Date: Wed May 29 21:26:19 2013 +0000

    Regenerate missing resized backing files

    Fixes bug 1185588 (for stable/grizzly)

    The only way to reliably determine whether we are using a legacy
    (pre-Grizzly) backing structure is to look at the backing file
    reference for the instance/disk itself. Thus, if we determine the
    backing file contains an underscore, we use the value following it
    as our legacy_backing_size, which is then used to create the
    necessary backing file.

    Change-Id: I145f71068c972a604e5361ae79d6315286136786
    Cherry-Pick: 6e768363450774cfee90e41aa5c40af780d3e04a