[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 */