block/backup: make backup cluster size configurable
64K might not always be appropriate, make this a runtime value. Signed-off-by: NJohn Snow <jsnow@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Message-id: 1456433911-24718-2-git-send-email-jsnow@redhat.com Signed-off-by: NJeff Cody <jcody@redhat.com>
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