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由 Fam Zheng 提交于
We need to handle the coming backing_blocker properly, so don't open code the assignment, instead, call bdrv_set_backing_hd to change backing_hd. Signed-off-by: NFam Zheng <famz@redhat.com> Reviewed-by: NJeff Cody <jcody@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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