ionic_q_space_avail
return ionic_q_space_avail(q) >= want;
ionic_q_space_avail(q),
ionic_q_space_avail(q),
ionic_q_space_avail(txq),
space = min_t(int, n, ionic_q_space_avail(txq));
ionic_q_space_avail(txq),
ionic_q_space_avail(txq),
n_fill = ionic_q_space_avail(q);