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由 Paolo Bonzini 提交于
This will be needed by bdrv_reopen_multiple, which calls bdrv_drain_all and thus will *release* the AioContext. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Message-Id: <1477565348-5458-17-git-send-email-pbonzini@redhat.com> Signed-off-by: NFam Zheng <famz@redhat.com>
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