Comment 7 for bug 1763712

Reviewed: https://review.openstack.org/624809
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=206f980cc2f09610ffb86cfc7728222fd39eee4f
Submitter: Zuul
Branch: master

commit 206f980cc2f09610ffb86cfc7728222fd39eee4f
Author: Dan Smith <email address hidden>
Date: Wed Dec 12 12:57:04 2018 -0800

    Synchronize all LVM operations

    This makes us synchronize/serialize all of our external calls to LVM
    operations in an attempt to avoid contention of LVM's own locking
    scheme, as well as avoid potentially overlapping operations that may
    be flushing large amounts of data to disk.

    Related-Bug: #1739482
    Related-Bug: #1763712
    Change-Id: Idb4053685486f2163e7cb135cd579eba5d78f369