From f3f05f7046e7c85b04af390d95a82a27160dd5d0 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Date: Tue, 9 Aug 2005 20:08:09 -0700 Subject: [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> --- net/ipv4/tcp_ipv4.c | 70 +++++++---------------------------------------------- 1 file changed, 9 insertions(+), 61 deletions(-) (limited to 'net/ipv4/tcp_ipv4.c') diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index f5373f9f00a..5f9ad95304c 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -228,62 +228,11 @@ fail: 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 @@ void tcp_unhash(struct sock *sk) 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 @@ ok: 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 @@ ok: 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 @@ struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb, 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 @@ static void *tcp_get_idx(struct seq_file *seq, loff_t pos) 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 @@ static void *tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos) 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 @@ static void tcp_seq_stop(struct seq_file *seq, void *v) } 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 @@ void __init tcp_v4_init(struct net_proto_family *ops) 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); -- cgit v1.2.2