Linux SMBFS: extra_specs lazy load error

[Lucian Petrut]

The Linux SMBFS driver uses volume extra specs in order to determine the according image format when creating new volumes. Accessing the extra_specs attribute can raise the following error as this attribute is lazy loaded:

DetachedInstanceError: Parent instance <VolumeTypes at 0x7f692ce12850> is not bound to a Session; lazy load operation of attribute 'extra_specs' cannot proceed

This can be avoided by simply eager loading the extra specs.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/167670

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/167670
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=19f6b7703663e12836fd6805e8c20b5507ede098
Submitter: Jenkins
Branch: master

commit 19f6b7703663e12836fd6805e8c20b5507ede098
Author: Lucian Petrut <email address hidden>
Date: Wed Mar 25 18:01:02 2015 +0200

    Eager load volume extra specs

    The Linux SMBFS driver uses volume extra specs in order to determine
    the according image format when creating new volumes.

    Accessing the extra_specs attribute can raise DetachedInstanceError
    as this attribute is lazy loaded and the session might close by the
    time this attribute is accessed.

    This can be avoided by simply eager loading the volume extra specs.

    Change-Id: Iffdb160a4a968067261aa90638832782caed5ed0
    Closes-Bug: #1436418