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This change sets the LBPRZ flag in EVPD page b2h and READ CAPACITY (16) based on a new unmap_zeroes_data device attribute. This flag is set automatically for iblock based on underlying block device queue's discard_zeroes_data flag. Signed-off-by: Jamie Pocas <jamie.pocas@emc.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>