Description of problem:
Upstream commit 7154cc892688f3c58cbbcdc2055f2635c1d0ef5b introduced a "-z" flag into blkdiscard.
RHEV is requesting this flag to be backported to RHEL to be used as a wiping mechanism.
If possible, a backport to RHEL 7.2.z would be great.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.