[INET]: Generalise the tcp_listen_ lock routines
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index f5373f9..5f9ad95 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -228,62 +228,11 @@
return ret;
}
-/* This lock without WQ_FLAG_EXCLUSIVE is good on UP and it can be very bad on SMP.
- * Look, when several writers sleep and reader wakes them up, all but one
- * immediately hit write lock and grab all the cpus. Exclusive sleep solves
- * this, _but_ remember, it adds useless work on UP machines (wake up each
- * exclusive lock release). It should be ifdefed really.
- */
-
-void tcp_listen_wlock(void)
-{
- write_lock(&tcp_hashinfo.lhash_lock);
-
- if (atomic_read(&tcp_hashinfo.lhash_users)) {
- DEFINE_WAIT(wait);
-
- for (;;) {
- prepare_to_wait_exclusive(&tcp_hashinfo.lhash_wait,
- &wait, TASK_UNINTERRUPTIBLE);
- if (!atomic_read(&tcp_hashinfo.lhash_users))
- break;
- write_unlock_bh(&tcp_hashinfo.lhash_lock);
- schedule();
- write_lock_bh(&tcp_hashinfo.lhash_lock);
- }
-
- finish_wait(&tcp_hashinfo.lhash_wait, &wait);
- }
-}
-
-static __inline__ void __tcp_v4_hash(struct sock *sk, const int listen_possible)
-{
- struct hlist_head *list;
- rwlock_t *lock;
-
- BUG_TRAP(sk_unhashed(sk));
- if (listen_possible && sk->sk_state == TCP_LISTEN) {
- list = &tcp_hashinfo.listening_hash[inet_sk_listen_hashfn(sk)];
- lock = &tcp_hashinfo.lhash_lock;
- tcp_listen_wlock();
- } else {
- sk->sk_hashent = inet_sk_ehashfn(sk, tcp_hashinfo.ehash_size);
- list = &tcp_hashinfo.ehash[sk->sk_hashent].chain;
- lock = &tcp_hashinfo.ehash[sk->sk_hashent].lock;
- write_lock(lock);
- }
- __sk_add_node(sk, list);
- sock_prot_inc_use(sk->sk_prot);
- write_unlock(lock);
- if (listen_possible && sk->sk_state == TCP_LISTEN)
- wake_up(&tcp_hashinfo.lhash_wait);
-}
-
static void tcp_v4_hash(struct sock *sk)
{
if (sk->sk_state != TCP_CLOSE) {
local_bh_disable();
- __tcp_v4_hash(sk, 1);
+ __inet_hash(&tcp_hashinfo, sk, 1);
local_bh_enable();
}
}
@@ -297,7 +246,7 @@
if (sk->sk_state == TCP_LISTEN) {
local_bh_disable();
- tcp_listen_wlock();
+ inet_listen_wlock(&tcp_hashinfo);
lock = &tcp_hashinfo.lhash_lock;
} else {
struct inet_ehash_bucket *head = &tcp_hashinfo.ehash[sk->sk_hashent];
@@ -624,7 +573,7 @@
inet_bind_hash(sk, tb, port);
if (sk_unhashed(sk)) {
inet_sk(sk)->sport = htons(port);
- __tcp_v4_hash(sk, 0);
+ __inet_hash(&tcp_hashinfo, sk, 0);
}
spin_unlock(&head->lock);
@@ -641,7 +590,7 @@
tb = inet_sk(sk)->bind_hash;
spin_lock_bh(&head->lock);
if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) {
- __tcp_v4_hash(sk, 0);
+ __inet_hash(&tcp_hashinfo, sk, 0);
spin_unlock_bh(&head->lock);
return 0;
} else {
@@ -1479,7 +1428,7 @@
newtp->advmss = dst_metric(dst, RTAX_ADVMSS);
tcp_initialize_rcv_mss(newsk);
- __tcp_v4_hash(newsk, 0);
+ __inet_hash(&tcp_hashinfo, newsk, 0);
__inet_inherit_port(&tcp_hashinfo, sk, newsk);
return newsk;
@@ -2102,12 +2051,12 @@
void *rc;
struct tcp_iter_state* st = seq->private;
- tcp_listen_lock();
+ inet_listen_lock(&tcp_hashinfo);
st->state = TCP_SEQ_STATE_LISTENING;
rc = listening_get_idx(seq, &pos);
if (!rc) {
- tcp_listen_unlock();
+ inet_listen_unlock(&tcp_hashinfo);
local_bh_disable();
st->state = TCP_SEQ_STATE_ESTABLISHED;
rc = established_get_idx(seq, pos);
@@ -2140,7 +2089,7 @@
case TCP_SEQ_STATE_LISTENING:
rc = listening_get_next(seq, v);
if (!rc) {
- tcp_listen_unlock();
+ inet_listen_unlock(&tcp_hashinfo);
local_bh_disable();
st->state = TCP_SEQ_STATE_ESTABLISHED;
rc = established_get_first(seq);
@@ -2168,7 +2117,7 @@
}
case TCP_SEQ_STATE_LISTENING:
if (v != SEQ_START_TOKEN)
- tcp_listen_unlock();
+ inet_listen_unlock(&tcp_hashinfo);
break;
case TCP_SEQ_STATE_TIME_WAIT:
case TCP_SEQ_STATE_ESTABLISHED:
@@ -2431,7 +2380,6 @@
EXPORT_SYMBOL(ipv4_specific);
EXPORT_SYMBOL(inet_bind_bucket_create);
EXPORT_SYMBOL(tcp_hashinfo);
-EXPORT_SYMBOL(tcp_listen_wlock);
EXPORT_SYMBOL(tcp_prot);
EXPORT_SYMBOL(tcp_unhash);
EXPORT_SYMBOL(tcp_v4_conn_request);