Exclusive locking should be optional in vendor passthru

[Dmitry Tantsur]

Currently all node vendor passthru's always receive a task with exclusive locking. That's not always needed and we should allow driver developers to opt-out from exclusive locking.

[Mario Villaplana (mario-villaplana-j)]

I'll take a look at this.

Relevant code:
https://github.com/openstack/ironic/blob/master/ironic/conductor/manager.py#L495
https://github.com/openstack/ironic/blob/master/ironic/drivers/base.py

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/226058

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/226058
Committed: https://git.openstack.org/cgit/openstack/ironic/commit/?id=ea06393fe853d6b54ab1e2f6d5c1f39e8c61907c
Submitter: Jenkins
Branch: master

commit ea06393fe853d6b54ab1e2f6d5c1f39e8c61907c
Author: Mario Villaplana <email address hidden>
Date: Thu Nov 19 22:38:58 2015 +0000

    Allow vendor drivers to acquire shared locks

    Previously, all node vendor passthru methods required an exclusive lock
    on the node to validate and start the task. This allows node vendor
    passthru methods to specify require_exclusive_lock=False in their
    passthru decorators to let the conductor acquire a shared lock on a
    node.

    Change-Id: I43cf43bc5c17f44a735e16c3c5cb744cf6911d27
    Closes-Bug: #1481665

[Thierry Carrez (ttx)]

This issue was fixed in the openstack/ironic 6.0.0 release.