[PATCH 31/33] sctp: add sctp_sock_set_nodelay

[Christoph Hellwig]

Add a helper to directly set the SCTP_NODELAY sockopt from kernel space
without going through a fake uaccess.

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 fs/dlm/lowcomms.c       | 10 ++--------
 include/net/sctp/sctp.h |  7 +++++++
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 69333728d871b..9f1c3cdc9d653 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -914,7 +914,6 @@ static int sctp_bind_addrs(struct connection *con, uint16_t 
port)
 static void sctp_connect_to_sock(struct connection *con)
 {
        struct sockaddr_storage daddr;
-       int one = 1;
        int result;
        int addr_len;
        struct socket *sock;
@@ -961,8 +960,7 @@ static void sctp_connect_to_sock(struct connection *con)
        log_print("connecting to %d", con->nodeid);
 
        /* Turn off Nagle's algorithm */
-       kernel_setsockopt(sock, SOL_SCTP, SCTP_NODELAY, (char *)&one,
-                         sizeof(one));
+       sctp_sock_set_nodelay(sock->sk);
 
        /*
         * Make sock->ops->connect() function return in specified time,
@@ -1176,7 +1174,6 @@ static int sctp_listen_for_all(void)
        struct socket *sock = NULL;
        int result = -EINVAL;
        struct connection *con = nodeid2con(0, GFP_NOFS);
-       int one = 1;
 
        if (!con)
                return -ENOMEM;
@@ -1191,10 +1188,7 @@ static int sctp_listen_for_all(void)
        }
 
        sock_set_rcvbuf(sock->sk, NEEDED_RMEM);
-       result = kernel_setsockopt(sock, SOL_SCTP, SCTP_NODELAY, (char *)&one,
-                                  sizeof(one));
-       if (result < 0)
-               log_print("Could not set SCTP NODELAY error %d\n", result);
+       sctp_sock_set_nodelay(sock->sk);
 
        write_lock_bh(&sock->sk->sk_callback_lock);
        /* Init con struct */
diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
index 3ab5c6bbb90bd..f8bcb75bb0448 100644
--- a/include/net/sctp/sctp.h
+++ b/include/net/sctp/sctp.h
@@ -615,4 +615,11 @@ static inline bool sctp_newsk_ready(const struct sock *sk)
        return sock_flag(sk, SOCK_DEAD) || sk->sk_socket;
 }
 
+static inline void sctp_sock_set_nodelay(struct sock *sk)
+{
+       lock_sock(sk);
+       sctp_sk(sk)->nodelay = true;
+       release_sock(sk);
+}
+
 #endif /* __net_sctp_h__ */
-- 
2.26.2