qemu-img: Convert with copy offloading
The new blk_co_copy_range interface offers a more efficient way in the case of network based storage. Make use of it to allow faster convert operation. Since copy offloading cannot do zero detection ('-S') and compression (-c), only try it when these options are not used. Signed-off-by: NFam Zheng <famz@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Message-id: 20180601092648.24614-11-famz@redhat.com Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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