Comment 5 for bug 1460692

Reviewed: https://review.openstack.org/187667
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=223b258be62eb448728647eb3c662df331557b0d
Submitter: Jenkins
Branch: stable/kilo

commit 223b258be62eb448728647eb3c662df331557b0d
Author: Gorka Eguileor <email address hidden>
Date: Mon Jun 1 18:30:01 2015 +0200

    Fix cinder concurrency issues on rtstool

    Since there's no synchronized access to configfs in rtslib it can happen
    that rtstool or rtslib access an element that no longer exists because
    it has been removed just in the middle of a loop by another Cinder
    request.

    This results in quite a different number of exceptions:
    - .dump()
    - KeyError
    - IOError
    - RTSLibError on storage_object

    This patch synchronizes access to all rtstool calls that access or
    modify configfs using utils.synchronized decorator.

    Change-Id: I341a10da54ab01be68a0cae843f35e5c841c6d81
    Closes-Bug: #1460692
    (cherry picked from commit 45c282afb442aec80cf24d226bef5ebb46963026)
    Conflicts:
     cinder/tests/targets/test_lio_driver.py