/* prepare transactions callbacks */
mdt->mdt_txn_cb.dtc_txn_start = NULL;
mdt->mdt_txn_cb.dtc_txn_stop = mdt_txn_stop_cb;
- mdt->mdt_txn_cb.dtc_txn_commit = NULL;
mdt->mdt_txn_cb.dtc_cookie = NULL;
mdt->mdt_txn_cb.dtc_tag = LCT_MD_THREAD;
INIT_LIST_HEAD(&mdt->mdt_txn_cb.dtc_linkage);