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net: add sock_no_linger

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Add a helper to directly set the SO_LINGER sockopt from kernel space
with onoff set to true and a linger time of 0 without going through a
fake uaccess.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig 2020-05-28 07:12:10 +02:00 committed by David S. Miller
parent b58f0e8f38
commit c433594c07
8 changed files with 16 additions and 37 deletions
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9
drivers/nvme/host/tcp.c
View file

@ -1313,7 +1313,6 @@ static int nvme_tcp_alloc_queue(struct nvme_ctrl *nctrl,
{
struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl);
struct nvme_tcp_queue *queue = &ctrl->queues[qid];
struct linger sol = { .l_onoff = 1, .l_linger = 0 };
int ret, opt, rcv_pdu_size;
queue->ctrl = ctrl;
@ -1361,13 +1360,7 @@ static int nvme_tcp_alloc_queue(struct nvme_ctrl *nctrl,
* close. This is done to prevent stale data from being sent should
* the network connection be restored before TCP times out.
*/
ret = kernel_setsockopt(queue->sock, SOL_SOCKET, SO_LINGER,
(char *)&sol, sizeof(sol));
if (ret) {
dev_err(nctrl->device,
"failed to set SO_LINGER sock opt %d\n", ret);
goto err_sock;
}
sock_no_linger(queue->sock->sk);
if (so_priority > 0) {
ret = kernel_setsockopt(queue->sock, SOL_SOCKET, SO_PRIORITY,

6
drivers/nvme/target/tcp.c
View file

@ -1429,7 +1429,6 @@ static int nvmet_tcp_set_queue_sock(struct nvmet_tcp_queue *queue)
{
struct socket *sock = queue->sock;
struct inet_sock *inet = inet_sk(sock->sk);
struct linger sol = { .l_onoff = 1, .l_linger = 0 };
int ret;
ret = kernel_getsockname(sock,
@ -1447,10 +1446,7 @@ static int nvmet_tcp_set_queue_sock(struct nvmet_tcp_queue *queue)
* close. This is done to prevent stale data from being sent should
* the network connection be restored before TCP times out.
*/
ret = kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER,
(char *)&sol, sizeof(sol));
if (ret)
return ret;
sock_no_linger(sock->sk);
if (so_priority > 0) {
ret = kernel_setsockopt(sock, SOL_SOCKET, SO_PRIORITY,

1
include/net/sock.h
View file

@ -2688,6 +2688,7 @@ static inline bool sk_dev_equal_l3scope(struct sock *sk, int dif)
void sock_def_readable(struct sock *sk);
void sock_no_linger(struct sock *sk);
void sock_set_reuseaddr(struct sock *sk);
#endif /* _SOCK_H */

9
net/core/sock.c
View file

@ -720,6 +720,15 @@ void sock_set_reuseaddr(struct sock *sk)
}
EXPORT_SYMBOL(sock_set_reuseaddr);
void sock_no_linger(struct sock *sk)
{
lock_sock(sk);
sk->sk_lingertime = 0;
sock_set_flag(sk, SOCK_LINGER);
release_sock(sk);
}
EXPORT_SYMBOL(sock_no_linger);
/*
* This is meant for all protocols to use and covers goings on
* at the socket level. Everything here is generic.

1
net/rds/tcp.h
View file

@ -73,7 +73,6 @@ void rds_tcp_listen_data_ready(struct sock *sk);
int rds_tcp_accept_one(struct socket *sock);
int rds_tcp_keepalive(struct socket *sock);
void *rds_tcp_listen_sock_def_readable(struct net *net);
void rds_tcp_set_linger(struct socket *sock);
/* tcp_recv.c */
int rds_tcp_recv_init(void);

2
net/rds/tcp_connect.c
View file

@ -207,7 +207,7 @@ void rds_tcp_conn_path_shutdown(struct rds_conn_path *cp)
if (sock) {
if (rds_destroy_pending(cp->cp_conn))
rds_tcp_set_linger(sock);
sock_no_linger(sock->sk);
sock->ops->shutdown(sock, RCV_SHUTDOWN | SEND_SHUTDOWN);
lock_sock(sock->sk);
rds_tcp_restore_callbacks(sock, tc); /* tc->tc_sock = NULL */

13
net/rds/tcp_listen.c
View file

@ -111,17 +111,6 @@ struct rds_tcp_connection *rds_tcp_accept_one_path(struct rds_connection *conn)
return NULL;
}
void rds_tcp_set_linger(struct socket *sock)
{
struct linger no_linger = {
.l_onoff = 1,
.l_linger = 0,
};
kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER,
(char *)&no_linger, sizeof(no_linger));
}
int rds_tcp_accept_one(struct socket *sock)
{
struct socket *new_sock = NULL;
@ -241,7 +230,7 @@ rst_nsk:
* be pending on it. By setting linger, we achieve the side-effect
* of avoiding TIME_WAIT state on new_sock.
*/
rds_tcp_set_linger(new_sock);
sock_no_linger(new_sock->sk);
kernel_sock_shutdown(new_sock, SHUT_RDWR);
ret = 0;
out:

12
net/sunrpc/svcsock.c
View file

@ -323,17 +323,9 @@ static int svc_tcp_has_wspace(struct svc_xprt *xprt)
static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt)
{
struct svc_sock *svsk;
struct socket *sock;
struct linger no_linger = {
.l_onoff = 1,
.l_linger = 0,
};
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
svsk = container_of(xprt, struct svc_sock, sk_xprt);
sock = svsk->sk_sock;
kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER,
(char *)&no_linger, sizeof(no_linger));
sock_no_linger(svsk->sk_sock->sk);
}
/*