CDFS4_BACK
bcp = rfs41_create_session_channel(CDFS4_BACK);
bcp->cn_dir |= CDFS4_BACK;
rok->bctsr_dir = CDFS4_BACK;
case CDFS4_BACK:
if (dir == CDFS4_BACK && sp->sn_back == NULL)
if (dir == CDFS4_BACK || dir == CDFS4_BOTH) {
dir = bdrpc ? (CDFS4_FORE | CDFS4_BACK) : CDFS4_FORE;