E-Series Volume extend converts thin volumes to thick

[Michael Price]

Thin provisioned volumes are being converted to thick provisioned volumes by the extend_volume operation.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/224285

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/224285
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=6984e0921e629c8b1b6e1f160f093818d233cb2f
Submitter: Jenkins
Branch: master

commit 6984e0921e629c8b1b6e1f160f093818d233cb2f
Author: Michael Price <email address hidden>
Date: Tue Aug 25 17:36:44 2015 -0500

    NetApp: Fix volume extend with E-Series

    Thin provisioned volumes were being converted to thick provisioned
    volumes by extend_volume. When thin provisioning support was added,
    the extend_volume method was not updated to use the correct API
    for performing the capacity expansion operation.

    This patch changes the volume extension strategy when a volume is
    thin provisioned to use the correct API. With a thick provisioned
    volume, a clone will be created with the new capacity, and the old
    volume removed, but a thin provisioned volume's capacity can simply
    be expanded directly, because that is merely the capacity that the user
    sees, as opposed to the backend provisioned capacity.

    Closes-Bug: 1493874
    Change-Id: Iec25f29381d5fba3409d1de83bf6816ae1a9ac22