Comment 34 for bug 1699573

Reviewed: https://review.openstack.org/604105
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=2dc52153215bb6a37532a959c5c98239be21bb56
Submitter: Zuul
Branch: stable/ocata

commit 2dc52153215bb6a37532a959c5c98239be21bb56
Author: Eric Young <email address hidden>
Date: Thu Mar 22 20:24:01 2018 -0400

    ScaleIO: Prevent usage of unsafe volumes

    It is possible for volumes, created from storage pools
    which have zero-padding disabled, to contain previous data. This
    change prevents these volumes from being created by default. A
    user can override this behavior by acknowleding the possibility
    with a configuration option.

    This is a squash of the four commits that led to the final state in
    rocky to not allow the creation of any type of non-zero-padded volumes
    to be created. This adds a config option that defaults to the safe
    behavior. It is backporting a new config option, and a change in default
    behavior, but it should be acceptable in this case so that the security
    vulnerability can be addressed.

    Closes-Bug: #1784871

    Change-Id: I62f8f48b1624fc9abb7427bd4ca51f7873d35b96
    Closes-bug: #1699573
    (cherry picked from commit f0cef07bef5ea8ed29179ee3774df5f4a634ba86)
    (cherry picked from commit 6309c097e653c5f8b40e0602950d0ef54a9efb37)