Description of problem:
The following code was merged upstream to enable CoW cloning for ephemeral volumes backed by RBD:
This is the last remaining big piece to allow 'diskless' compute nodes with all of their VM storage backed by Ceph.
Having this backported to RHEL-OSP5 has been demanded by various customers.
Not a blocker for joint solution GA release.
*** This bug has been marked as a duplicate of bug 1062022 ***