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由 Fam Zheng 提交于
More often it is that bdrv_ioctl fails due to not supported by driver or whatever reason, in this case we should be specific, because "interface too old" is very confusing. Signed-off-by: NFam Zheng <famz@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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