net: add sock_set_sndtimeo

Add a helper to directly set the SO_SNDTIMEO_NEW sockopt from kernel
space without going through a fake uaccess.  The interface is
simplified to only pass the seconds value, as that is the only
thing needed at the moment.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 88f2574..b79711d 100644 (file)
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -918,7 +918,6 @@ static void sctp_connect_to_sock(struct connection *con)
        int result;
        int addr_len;
        struct socket *sock;
-       struct __kernel_sock_timeval tv = { .tv_sec = 5, .tv_usec = 0 };
 
        if (con->nodeid == 0) {
                log_print("attempt to connect sock 0 foiled");
@@ -970,13 +969,10 @@ static void sctp_connect_to_sock(struct connection *con)
         * since O_NONBLOCK argument in connect() function does not work here,
         * then, we should restore the default value of this attribute.
         */
-       kernel_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO_NEW, (char *)&tv,
-                         sizeof(tv));
+       sock_set_sndtimeo(sock->sk, 5);
        result = sock->ops->connect(sock, (struct sockaddr *)&daddr, addr_len,
                                   0);
-       memset(&tv, 0, sizeof(tv));
-       kernel_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO_NEW, (char *)&tv,
-                         sizeof(tv));
+       sock_set_sndtimeo(sock->sk, 0);
 
        if (result == -EINPROGRESS)
                result = 0;

diff --git a/include/net/sock.h b/include/net/sock.h
index a3a4314..9a7b9e9 100644 (file)
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2691,5 +2691,6 @@ void sock_def_readable(struct sock *sk);
 void sock_no_linger(struct sock *sk);
 void sock_set_priority(struct sock *sk, u32 priority);
 void sock_set_reuseaddr(struct sock *sk);
+void sock_set_sndtimeo(struct sock *sk, s64 secs);
 
 #endif /* _SOCK_H */

diff --git a/net/core/sock.c b/net/core/sock.c
index ceda1a9..d3b1d61 100644 (file)
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -737,6 +737,17 @@ void sock_set_priority(struct sock *sk, u32 priority)
 }
 EXPORT_SYMBOL(sock_set_priority);
 
+void sock_set_sndtimeo(struct sock *sk, s64 secs)
+{
+       lock_sock(sk);
+       if (secs && secs < MAX_SCHEDULE_TIMEOUT / HZ - 1)
+               sk->sk_sndtimeo = secs * HZ;
+       else
+               sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
+       release_sock(sk);
+}
+EXPORT_SYMBOL(sock_set_sndtimeo);
+
 /*
  *     This is meant for all protocols to use and covers goings on
  *     at the socket level. Everything here is generic.