qmp: Add optional bool "unmap" to drive-mirror
If specified as "true", it allows discarding on target sectors where source is not allocated. Signed-off-by: NFam Zheng <famz@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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If specified as "true", it allows discarding on target sectors where source is not allocated. Signed-off-by: NFam Zheng <famz@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>