dlm_reco_unlock_ast
ret = dlmunlock(dlm, &lksb, 0, dlm_reco_unlock_ast, dlm);
ret = dlmunlock(dlm, &lksb, LKM_CANCEL, dlm_reco_unlock_ast, dlm);
static void dlm_reco_unlock_ast(void *astdata, enum dlm_status st);