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authorEric Dumazet <dada1@cosmosbay.com>2008-11-23 17:22:55 -0800
committerDavid S. Miller <davem@davemloft.net>2008-11-23 17:22:55 -0800
commitc25eb3bfb97294d0543a81230fbc237046b4b84c (patch)
tree6c9deabfb12f4d31f280cfcfe7e7580a2089931c /net/ipv4/inet_diag.c
parent8c862c23e2563e6aedfc6c4aa6827cadb83f2414 (diff)
net: Convert TCP/DCCP listening hash tables to use RCU
This is the last step to be able to perform full RCU lookups in __inet_lookup() : After established/timewait tables, we add RCU lookups to listening hash table. The only trick here is that a socket of a given type (TCP ipv4, TCP ipv6, ...) can now flight between two different tables (established and listening) during a RCU grace period, so we must use different 'nulls' end-of-chain values for two tables. We define a large value : #define LISTENING_NULLS_BASE (1U << 29) So that slots in listening table are guaranteed to have different end-of-chain values than slots in established table. A reader can still detect it finished its lookup in the right chain. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/inet_diag.c')
-rw-r--r--net/ipv4/inet_diag.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 998a78f169f..588a7796e3e 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -720,13 +720,13 @@ static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
struct sock *sk;
- struct hlist_node *node;
+ struct hlist_nulls_node *node;
struct inet_listen_hashbucket *ilb;
num = 0;
ilb = &hashinfo->listening_hash[i];
spin_lock_bh(&ilb->lock);
- sk_for_each(sk, node, &ilb->head) {
+ sk_nulls_for_each(sk, node, &ilb->head) {
struct inet_sock *inet = inet_sk(sk);
if (num < s_num) {