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由 Benoît Canet 提交于
Create bdrv_get_backing_file_depth() in order to be able to show in QMP and HMP how many ancestors backing an image a block device have. Signed-off-by: NBenoit Canet <benoit@irqsave.net> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>
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