/*
     * If closing an unmodified file, check that no update is required for active readers.
     */
    if (!btree->modified && !bulk) {
        WT_RET(__wt_txn_update_oldest(session, WT_TXN_OLDEST_STRICT | WT_TXN_OLDEST_WAIT));
        return (__wt_txn_visible_all(session, btree->rec_max_txn, btree->rec_max_timestamp) ?
            __wt_evict_file(session, WT_SYNC_DISCARD) :
            EBUSY);
    }