[PATCH 18/36] net/tcp: convert to ->poll_mask

Christoph Hellwig
2018-01-17T19:28:51Z

include/net/tcp.h | 4 ++--
net/ipv4/af_inet.c | 3 ++-
net/ipv4/tcp.c | 33 ++++++++++++++-------------------
net/ipv6/af_inet6.c | 3 ++-
4 files changed, 20 insertions(+), 23 deletions(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 50b21a49d870..75b3ce444b1c 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -387,8 +387,8 @@ bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst);
void tcp_close(struct sock *sk, long timeout);
void tcp_init_sock(struct sock *sk);
void tcp_init_transfer(struct sock *sk, int bpf_op);
-__poll_t tcp_poll(struct file *file, struct socket *sock,
- struct poll_table_struct *wait);
+struct wait_queue_head *tcp_get_poll_head(struct socket *sock, __poll_t events);
+__poll_t tcp_poll_mask(struct socket *sock, __poll_t events);
int tcp_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen);
int tcp_setsockopt(struct sock *sk, int level, int optname,
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index f00499a46927..2a362198a03e 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -934,7 +934,8 @@ const struct proto_ops inet_stream_ops = {
.socketpair = sock_no_socketpair,
.accept = inet_accept,
.getname = inet_getname,
- .poll = tcp_poll,
+ .get_poll_head = tcp_get_poll_head,
+ .poll_mask = tcp_poll_mask,
.ioctl = inet_ioctl,
.listen = inet_listen,
.shutdown = inet_shutdown,
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index c4a7ee7f6721..4d88c765cfcc 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -486,35 +486,30 @@ static void tcp_tx_timestamp(struct sock *sk, u16 tsflags)
}
}

+struct wait_queue_head *tcp_get_poll_head(struct socket *sock, __poll_t events)
+{
+ sock_poll_busy_loop(sock, events);
+ sock_rps_record_flow(sock->sk);
+ return sk_sleep(sock->sk);
+}
+EXPORT_SYMBOL(tcp_get_poll_head);
+
/*
- * Wait for a TCP event.
- *
- * Note that we don't need to lock the socket, as the upper poll layers
- * take care of normal races (between the test and the event) and we don't
- * go look at any of the socket buffers directly.
+ * Socket is not locked. We are protected from async events by poll logic and
+ * correct handling of state changes made by other threads is impossible in
+ * any case.
*/
-__poll_t tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
+__poll_t tcp_poll_mask(struct socket *sock, __poll_t events)
{
- __poll_t mask;
struct sock *sk = sock->sk;
const struct tcp_sock *tp = tcp_sk(sk);
+ __poll_t mask = 0;
int state;

- sock_rps_record_flow(sk);
-
- sock_poll_wait(file, sk_sleep(sk), wait);
-
state = sk_state_load(sk);
if (state == TCP_LISTEN)
return inet_csk_listen_poll(sk);

- /* Socket is not locked. We are protected from async events
- * by poll logic and correct handling of state changes
- * made by other threads is impossible in any case.
- */
-
- mask = 0;
-
/*
* POLLHUP is certainly not done right. But poll() doesn't
* have a notion of HUP in just one direction, and for a
@@ -595,7 +590,7 @@ __poll_t tcp_poll(struct file *file, struct socket *sock, poll_table *wait)

return mask;
}
-EXPORT_SYMBOL(tcp_poll);
+EXPORT_SYMBOL(tcp_poll_mask);

int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg)
{
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index c9441ca45399..cccbb6e6603a 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -544,7 +544,8 @@ const struct proto_ops inet6_stream_ops = {
.socketpair = sock_no_socketpair, /* a do nothing */
.accept = inet_accept, /* ok */
.getname = inet6_getname,
- .poll = tcp_poll, /* ok */
+ .get_poll_head = tcp_get_poll_head,
+ .poll_mask = tcp_poll_mask, /* ok */
.ioctl = inet6_ioctl, /* must change */
.listen = inet_listen, /* ok */
.shutdown = inet_shutdown, /* ok */
--
2.14.2