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xen/blkfront: cleanup stale persistent grants
Add a periodic cleanup function to remove old persistent grants which are no longer in use on the backend side. This avoids starvation in case there are lots of persistent grants for a device which no longer is involved in I/O business. Signed-off-by: Juergen Gross <[email protected]> Reviewed-by: Roger Pau Monné <[email protected]> Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
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