[NET] Generalise tcp_listen_opt

This chunks out the accept_queue and tcp_listen_opt code and moves
them to net/core/request_sock.c and include/net/request_sock.h, to
make it useful for other transport protocols, DCCP being the first one
to use it.

Next patches will rename tcp_listen_opt to accept_sock and remove the
inline tcp functions that just call a reqsk_queue_ function.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 16 deletions

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index fb54292a15aa..97a7c9e03df5 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -379,22 +379,7 @@ struct tcp_sock {
 
         __u32   total_retrans;  /* Total retransmits for entire connection */
 
-        /* The syn_wait_lock is necessary only to avoid proc interface having
-         * to grab the main lock sock while browsing the listening hash
-         * (otherwise it's deadlock prone).
-         * This lock is acquired in read mode only from listening_get_next()
-         * and it's acquired in write mode _only_ from code that is actively
-         * changing the syn_wait_queue. All readers that are holding
-         * the master sock lock don't need to grab this lock in read mode
-         * too as the syn_wait_queue writes are always protected from
-         * the main sock lock.
-         */
-        rwlock_t                syn_wait_lock;
-        struct tcp_listen_opt   *listen_opt;
-
-        /* FIFO of established children */
-        struct request_sock     *accept_queue;
-        struct request_sock     *accept_queue_tail;
+        struct request_sock_queue accept_queue; /* FIFO of established children */
 
         unsigned int            keepalive_time;   /* time before keep alive takes place */
         unsigned int            keepalive_intvl;  /* time interval between keep alive probes */