DB_FLUSH
if (flags == DB_FLUSH || flags == DB_CHECKPOINT)
flags != DB_CURLSN && flags != DB_FLUSH)
F_ISSET(mgr, DB_TXN_NOSYNC) ? 0 : DB_FLUSH,
F_ISSET(txnp->mgrp, DB_TXN_NOSYNC) ? 0 : DB_FLUSH, TXN_PREPARE,