Nova libvirt driver not passing REUSE flag when _swap_volume calls blockRebase

[Bill Owen]

For filesystem backed Cinder drivers like GPFS, a new volume file is created before the swap operation is invoked as part of the online volume migration sequence.

For this reason, the call to blockRebase from . _swap_volume (in nova.virt.libvirt.driver) should include the flag VIR_DOMAIN_BLOCK_REBASE_REUSE_EXT to allow the newly created volume file to be written to.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/44210

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/44210
Committed: http://github.com/openstack/nova/commit/6653abe5b11b2fccdc0c02083297335d42d57fe1
Submitter: Jenkins
Branch: master

commit 6653abe5b11b2fccdc0c02083297335d42d57fe1
Author: Bill Owen <email address hidden>
Date: Wed Aug 28 21:59:52 2013 -0700

    Add REUSE_EXT in _swap_volume call to blockRebase

    _swap_volume is called in cases where new volume file has
    already been created. Add VIR_DOMAIN_BLOCK_REBASE_RESUE_EXT
    in the flags passed when calling blockRebase to allow
    the existing volume file to be written to.

    Closes-Bug: #1218057

    Change-Id: I704772ba4bfef474fc788d277c99ba016fb7883f