backend_tx_begin
int backend_tx_begin(backend_type_t, backend_tx_t **);
rc = backend_tx_begin(BACKEND_TYPE_NORMAL, &dip.di_tx);
rc = backend_tx_begin(BACKEND_TYPE_NONPERSIST, &dip.di_np_tx);
if ((rc = backend_tx_begin(pp->rn_id.rl_backend, &tx)) !=
rc_wr = backend_tx_begin(BACKEND_TYPE_NORMAL, &tx_wr);
rc_wr = backend_tx_begin(BACKEND_TYPE_NONPERSIST, &tx_wr);
result = backend_tx_begin(BACKEND_TYPE_NORMAL, &tx);
result = backend_tx_begin(BACKEND_TYPE_NORMAL, &tx);
ret = backend_tx_begin(backend, &tx);