block: add the support to drain throttled requests
Signed-off-by: NZhi Yong Wu <wuzhy@linux.vnet.ibm.com> [ Iterate until all block devices have processed all requests, add comments. - Paolo ] Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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