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由 Roger Pau Monne 提交于
There's no need to keep the foreign access in a grant if it is not persistently mapped by the backend. This allows us to free grants that are not mapped by the backend, thus preventing blkfront from hoarding all grants. The main effect of this is that blkfront will only persistently map the same grants as the backend, and it will always try to use grants that are already mapped by the backend. Also the number of persistent grants in blkfront is the same as in blkback (and is controlled by the value in blkback). Signed-off-by: NRoger Pau Monné <roger.pau@citrix.com> Reviewed-by: NDavid Vrabel <david.vrabel@citrix.com> Acked-by: NMatt Wilson <msw@amazon.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: David Vrabel <david.vrabel@citrix.com> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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