Comment 9 for bug 1065702

Reviewed: https://review.openstack.org/15157
Committed: http://github.com/openstack/cinder/commit/7f34ba39abcaa4f885d7448b427148fab4e49892
Submitter: Jenkins
Branch: stable/folsom

commit 7f34ba39abcaa4f885d7448b427148fab4e49892
Author: John Griffith <email address hidden>
Date: Wed Oct 31 16:43:09 2012 -0600

    Detect and fix issues caused by vol ID migration

    The migration from volume ID to UUID neglected to update the provider_location
    field on the volume. As a result the iqn and volume name no long match and
    existing volumes are no longer able to be attached after an upgrade
    (essex -> folsom and then nova-vol->cinder).

    This patch adds a method to the volume driver that will check for the
    mismatch of volume name in the iqn during service start up. If
    detected it will update the provider_location field in the database
    to include the new ID. Also it will create a symlink to the device backing
    file that also has the correct naming convention.

    Note: We don't disturb an connections that are currently attached.
    For this case we add a check in manager.detach and do any provider_location
    cleanup that's needed at that time. This ensures that connections
    persist on restarts of tgtd and reboot.

    Change-Id: I4683df4ef489972752dc58cb4e91d458a79a8ef2
    Fixes: bug 1065702enter the commit message for your changes. Lines starting