net/ipv4/tcp.c

1927 				    struct tcp_zerocopy_receive *zc, int inq,
1940 	err = import_ubuf(ITER_DEST, (void __user *)copy_address, inq,
1945 	err = tcp_recvmsg_locked(sk, &msg, inq, MSG_DONTWAIT,
1997 	/* skb is null if inq < PAGE_SIZE. */
2161 	int inq = tcp_inq(sk);
2176 	if (inq && inq <= copybuf_len)
2177 		return receive_fallback_to_copy(sk, zc, inq, tss);
2179 	if (inq < PAGE_SIZE) {
2181 		zc->recv_skip_hint = inq;
2182 		if (!inq && sock_flag(sk, SOCK_DONE))
2192 	avail_len = min_t(u32, vma_len, inq);
2373 	int inq;
2375 	inq = rcv_nxt - copied_seq;
2376 	if (unlikely(inq < 0 || copied_seq != READ_ONCE(tp->copied_seq))) {
2378 		inq = tp->rcv_nxt - tp->copied_seq;
2382 	 * by returning a non-zero inq.
2384 	if (inq == 0 && sock_flag(sk, SOCK_DONE))
2385 		inq = 1;
2386 	return inq;
4681 		case offsetofend(struct tcp_zerocopy_receive, inq):
4696 		zc.inq = tcp_inq_hint(sk);