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Issue EXTENDED COPY (LID1) command to implement the copy_range API. The parameter data construction code is modified from libiscsi's iscsi-dd.c. Signed-off-by: Fam Zheng <famz@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 20180601092648.24614-9-famz@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>