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authorEric Dumazet <edumazet@google.com>2015-07-09 00:28:29 +0300
committerDavid S. Miller <davem@davemloft.net>2015-07-10 01:12:20 +0300
commitfc01538f9fb75572c969ca9988176ffc2a8741d6 (patch)
tree51125f77aaa93b73953f7d3189c1e2a13a904490 /net/ipv4/inet_hashtables.c
parent3fd2f1b9d91284afb957ab9899a83279d0e09f29 (diff)
downloadlinux-fc01538f9fb75572c969ca9988176ffc2a8741d6.tar.xz
inet: simplify timewait refcounting
timewait sockets have a complex refcounting logic. Once we realize it should be similar to established and syn_recv sockets, we can use sk_nulls_del_node_init_rcu() and remove inet_twsk_unhash() In particular, deferred inet_twsk_put() added in commit 13475a30b66cd ("tcp: connect() race with timewait reuse") looks unecessary : When removing a timewait socket from ehash or bhash, caller must own a reference on the socket anyway. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/inet_hashtables.c')
-rw-r--r--net/ipv4/inet_hashtables.c31
1 files changed, 10 insertions, 21 deletions
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 5f9b063bbe8a..e58840330da7 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -343,7 +343,6 @@ static int __inet_check_established(struct inet_timewait_death_row *death_row,
struct sock *sk2;
const struct hlist_nulls_node *node;
struct inet_timewait_sock *tw = NULL;
- int twrefcnt = 0;
spin_lock(lock);
@@ -371,12 +370,10 @@ static int __inet_check_established(struct inet_timewait_death_row *death_row,
WARN_ON(!sk_unhashed(sk));
__sk_nulls_add_node_rcu(sk, &head->chain);
if (tw) {
- twrefcnt = inet_twsk_unhash(tw);
+ sk_nulls_del_node_init_rcu((struct sock *)tw);
NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED);
}
spin_unlock(lock);
- if (twrefcnt)
- inet_twsk_put(tw);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
if (twp) {
@@ -384,7 +381,6 @@ static int __inet_check_established(struct inet_timewait_death_row *death_row,
} else if (tw) {
/* Silly. Should hash-dance instead... */
inet_twsk_deschedule(tw);
-
inet_twsk_put(tw);
}
return 0;
@@ -403,13 +399,12 @@ static u32 inet_sk_port_offset(const struct sock *sk)
inet->inet_dport);
}
-int __inet_hash_nolisten(struct sock *sk, struct inet_timewait_sock *tw)
+void __inet_hash_nolisten(struct sock *sk, struct sock *osk)
{
struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
struct hlist_nulls_head *list;
struct inet_ehash_bucket *head;
spinlock_t *lock;
- int twrefcnt = 0;
WARN_ON(!sk_unhashed(sk));
@@ -420,23 +415,22 @@ int __inet_hash_nolisten(struct sock *sk, struct inet_timewait_sock *tw)
spin_lock(lock);
__sk_nulls_add_node_rcu(sk, list);
- if (tw) {
- WARN_ON(sk->sk_hash != tw->tw_hash);
- twrefcnt = inet_twsk_unhash(tw);
+ if (osk) {
+ WARN_ON(sk->sk_hash != osk->sk_hash);
+ sk_nulls_del_node_init_rcu(osk);
}
spin_unlock(lock);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
- return twrefcnt;
}
EXPORT_SYMBOL_GPL(__inet_hash_nolisten);
-int __inet_hash(struct sock *sk, struct inet_timewait_sock *tw)
+void __inet_hash(struct sock *sk, struct sock *osk)
{
struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
struct inet_listen_hashbucket *ilb;
if (sk->sk_state != TCP_LISTEN)
- return __inet_hash_nolisten(sk, tw);
+ return __inet_hash_nolisten(sk, osk);
WARN_ON(!sk_unhashed(sk));
ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
@@ -445,7 +439,6 @@ int __inet_hash(struct sock *sk, struct inet_timewait_sock *tw)
__sk_nulls_add_node_rcu(sk, &ilb->head);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
spin_unlock(&ilb->lock);
- return 0;
}
EXPORT_SYMBOL(__inet_hash);
@@ -492,7 +485,6 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
struct inet_bind_bucket *tb;
int ret;
struct net *net = sock_net(sk);
- int twrefcnt = 1;
if (!snum) {
int i, remaining, low, high, port;
@@ -560,18 +552,15 @@ ok:
inet_bind_hash(sk, tb, port);
if (sk_unhashed(sk)) {
inet_sk(sk)->inet_sport = htons(port);
- twrefcnt += __inet_hash_nolisten(sk, tw);
+ __inet_hash_nolisten(sk, (struct sock *)tw);
}
if (tw)
- twrefcnt += inet_twsk_bind_unhash(tw, hinfo);
+ inet_twsk_bind_unhash(tw, hinfo);
spin_unlock(&head->lock);
if (tw) {
inet_twsk_deschedule(tw);
- while (twrefcnt) {
- twrefcnt--;
- inet_twsk_put(tw);
- }
+ inet_twsk_put(tw);
}
ret = 0;