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由 Kevin Wolf 提交于
BlockBackends use it to get a back pointer from BdrvChild to BlockBackend in any BdrvChildRole callbacks. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NAlberto Garcia <berto@igalia.com> Acked-by: NStefan Hajnoczi <stefanha@redhat.com>
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