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由 Paolo Bonzini 提交于
bdrv_close should leave fields in the same state as bdrv_new. It is not up to bdrv_open_common to fix the mess. Also, backing_format was not being re-initialized. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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