NetApp cDOT driver with vserver creds can't create shares

[Clinton Knight]

With the new oversubscription-aware scheduler logic in Liberty, the NetApp cDOT driver can no longer provision shares when the driver only has vserver-scoped credentials. This is because the new scheduler logic requires the pool total size, whereas previously the scheduler only needed the pool free space. Total pool size is not available from cDOT when using vserver-scoped credentials, so the driver must change to return 'unknown' in that case and none of the free space checking or oversubscription logic can be used. When using cluster-scoped credentials, total pool size is available and everything works fine.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/221324

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/221324
Committed: https://git.openstack.org/cgit/openstack/manila/commit/?id=03ef2fba790ca5b77a232cb2c699359bc343958a
Submitter: Jenkins
Branch: master

commit 03ef2fba790ca5b77a232cb2c699359bc343958a
Author: Clinton Knight <email address hidden>
Date: Sun Aug 30 21:00:37 2015 -0400

    NetApp cDOT driver with vserver creds can't create shares

    With the new oversubscription-aware scheduler logic in Liberty,
    the NetApp cDOT driver can no longer provision shares when the
    driver only has vserver-scoped credentials. This is because the
    new scheduler logic requires the pool total size, whereas
    previously the scheduler only needed the pool free space. Total
    pool size is not available from cDOT when using vserver-scoped
    credentials, so the driver must change to return 'unknown' in
    that case and none of the free space checking or oversubscription
    logic can be used. When using cluster-scoped credentials, total
    pool size is available and everything works fine.

    Change-Id: I772fd8b133364439381a656ed84f9319b38eb135
    Closes-Bug: 1490357