xen/blkback: safely unmap purge persistent grants
Commit c43cf3ea ("xen-blkback: safely unmap grants in case they are still in use") use gnttab_unmap_refs_async() to wait until the mapped pages are no longer in use before unmapping them, but that commit missed the persistent case. Purge persistent pages can't be unmapped either unless no longer in use. Signed-off-by: NBob Liu <bob.liu@oracle.com> Acked-by: NRoger Pau Monné <roger.pau@citrix.com> Signed-off-by: NDavid Vrabel <david.vrabel@citrix.com>
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