rolling_buffer_delete_spent
folioq = rolling_buffer_delete_spent(&rreq->buffer);
folioq = rolling_buffer_delete_spent(&rreq->buffer);
folioq = rolling_buffer_delete_spent(&creq->buffer);
folioq = rolling_buffer_delete_spent(&creq->buffer);
folioq = rolling_buffer_delete_spent(&wreq->buffer);
folioq = rolling_buffer_delete_spent(&wreq->buffer);
struct folio_queue *rolling_buffer_delete_spent(struct rolling_buffer *roll);