diff options
| author | Julian Anastasov <ja@ssi.bg> | 2013-03-21 13:58:07 +0400 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2013-04-02 02:23:43 +0400 |
| commit | 363c97d7435ebba8a040f86e29bdec79ee182f0c (patch) | |
| tree | f472b8185419864ec9c1a95db2d88bbdb804fda7 /net/netfilter/ipvs/ip_vs_proto_sctp.c | |
| parent | 026ace060dfe29275d2188297a62fa37d6c1a02c (diff) | |
| download | linux-363c97d7435ebba8a040f86e29bdec79ee182f0c.tar.xz | |
ipvs: convert app locks
We use locks like tcp_app_lock, udp_app_lock,
sctp_app_lock to protect access to the protocol hash tables
from readers in packet context while the application
instances (inc) are [un]registered under global mutex.
As the hash tables are mostly read when conns are
created and bound to app, use RCU for readers and reclaim
app instance after grace period.
Simplify ip_vs_app_inc_get because we use usecnt
only for statistics and rely on module refcounting.
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off by: Hans Schillstrom <hans@schillstrom.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
Diffstat (limited to 'net/netfilter/ipvs/ip_vs_proto_sctp.c')
| -rw-r--r-- | net/netfilter/ipvs/ip_vs_proto_sctp.c | 18 |
1 files changed, 6 insertions, 12 deletions
diff --git a/net/netfilter/ipvs/ip_vs_proto_sctp.c b/net/netfilter/ipvs/ip_vs_proto_sctp.c index cd1d7298f7ba..f7190cdf023e 100644 --- a/net/netfilter/ipvs/ip_vs_proto_sctp.c +++ b/net/netfilter/ipvs/ip_vs_proto_sctp.c @@ -1016,30 +1016,25 @@ static int sctp_register_app(struct net *net, struct ip_vs_app *inc) hash = sctp_app_hashkey(port); - spin_lock_bh(&ipvs->sctp_app_lock); list_for_each_entry(i, &ipvs->sctp_apps[hash], p_list) { if (i->port == port) { ret = -EEXIST; goto out; } } - list_add(&inc->p_list, &ipvs->sctp_apps[hash]); + list_add_rcu(&inc->p_list, &ipvs->sctp_apps[hash]); atomic_inc(&pd->appcnt); out: - spin_unlock_bh(&ipvs->sctp_app_lock); return ret; } static void sctp_unregister_app(struct net *net, struct ip_vs_app *inc) { - struct netns_ipvs *ipvs = net_ipvs(net); struct ip_vs_proto_data *pd = ip_vs_proto_data_get(net, IPPROTO_SCTP); - spin_lock_bh(&ipvs->sctp_app_lock); atomic_dec(&pd->appcnt); - list_del(&inc->p_list); - spin_unlock_bh(&ipvs->sctp_app_lock); + list_del_rcu(&inc->p_list); } static int sctp_app_conn_bind(struct ip_vs_conn *cp) @@ -1055,12 +1050,12 @@ static int sctp_app_conn_bind(struct ip_vs_conn *cp) /* Lookup application incarnations and bind the right one */ hash = sctp_app_hashkey(cp->vport); - spin_lock(&ipvs->sctp_app_lock); - list_for_each_entry(inc, &ipvs->sctp_apps[hash], p_list) { + rcu_read_lock(); + list_for_each_entry_rcu(inc, &ipvs->sctp_apps[hash], p_list) { if (inc->port == cp->vport) { if (unlikely(!ip_vs_app_inc_get(inc))) break; - spin_unlock(&ipvs->sctp_app_lock); + rcu_read_unlock(); IP_VS_DBG_BUF(9, "%s: Binding conn %s:%u->" "%s:%u to app %s on port %u\n", @@ -1076,7 +1071,7 @@ static int sctp_app_conn_bind(struct ip_vs_conn *cp) goto out; } } - spin_unlock(&ipvs->sctp_app_lock); + rcu_read_unlock(); out: return result; } @@ -1090,7 +1085,6 @@ static int __ip_vs_sctp_init(struct net *net, struct ip_vs_proto_data *pd) struct netns_ipvs *ipvs = net_ipvs(net); ip_vs_init_hash_table(ipvs->sctp_apps, SCTP_APP_TAB_SIZE); - spin_lock_init(&ipvs->sctp_app_lock); pd->timeout_table = ip_vs_create_timeout_table((int *)sctp_timeouts, sizeof(sctp_timeouts)); if (!pd->timeout_table) |