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[NETFILTER]: nf_conntrack: switch rwlock to spinlock

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With the RCU conversion only write_lock usages of nf_conntrack_lock are
left (except one read_lock that should actually use write_lock in the
H.323 helper). Switch to a spinlock.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2008-01-31 04:38:58 -08:00 committed by David S. Miller
parent 76507f69c4
commit f8ba1affa1
6 changed files with 41 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/netfilter/nf_conntrack_core.h
View File

@ -72,7 +72,7 @@ print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
struct nf_conntrack_l4proto *proto);
extern struct hlist_head *nf_conntrack_hash;
extern rwlock_t nf_conntrack_lock ;
extern spinlock_t nf_conntrack_lock ;
extern struct hlist_head unconfirmed;
#endif /* _NF_CONNTRACK_CORE_H */

38
net/netfilter/nf_conntrack_core.c
View File

@ -40,7 +40,7 @@
#define NF_CONNTRACK_VERSION "0.5.0"
DEFINE_RWLOCK(nf_conntrack_lock);
DEFINE_SPINLOCK(nf_conntrack_lock);
EXPORT_SYMBOL_GPL(nf_conntrack_lock);
/* nf_conntrack_standalone needs this */
@ -199,7 +199,7 @@ destroy_conntrack(struct nf_conntrack *nfct)
rcu_read_unlock();
write_lock_bh(&nf_conntrack_lock);
spin_lock_bh(&nf_conntrack_lock);
/* Expectations will have been removed in clean_from_lists,
* except TFTP can create an expectation on the first packet,
* before connection is in the list, so we need to clean here,
@ -213,7 +213,7 @@ destroy_conntrack(struct nf_conntrack *nfct)
}
NF_CT_STAT_INC(delete);
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
if (ct->master)
nf_ct_put(ct->master);
@ -236,12 +236,12 @@ static void death_by_timeout(unsigned long ul_conntrack)
rcu_read_unlock();
}
write_lock_bh(&nf_conntrack_lock);
spin_lock_bh(&nf_conntrack_lock);
/* Inside lock so preempt is disabled on module removal path.
* Otherwise we can get spurious warnings. */
NF_CT_STAT_INC(delete_list);
clean_from_lists(ct);
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
nf_ct_put(ct);
}
@ -303,9 +303,9 @@ void nf_conntrack_hash_insert(struct nf_conn *ct)
hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
write_lock_bh(&nf_conntrack_lock);
spin_lock_bh(&nf_conntrack_lock);
__nf_conntrack_hash_insert(ct, hash, repl_hash);
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
}
EXPORT_SYMBOL_GPL(nf_conntrack_hash_insert);
@ -342,7 +342,7 @@ __nf_conntrack_confirm(struct sk_buff *skb)
NF_CT_ASSERT(!nf_ct_is_confirmed(ct));
pr_debug("Confirming conntrack %p\n", ct);
write_lock_bh(&nf_conntrack_lock);
spin_lock_bh(&nf_conntrack_lock);
/* See if there's one in the list already, including reverse:
NAT could have grabbed it without realizing, since we're
@ -368,7 +368,7 @@ __nf_conntrack_confirm(struct sk_buff *skb)
atomic_inc(&ct->ct_general.use);
set_bit(IPS_CONFIRMED_BIT, &ct->status);
NF_CT_STAT_INC(insert);
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
help = nfct_help(ct);
if (help && help->helper)
nf_conntrack_event_cache(IPCT_HELPER, skb);
@ -383,7 +383,7 @@ __nf_conntrack_confirm(struct sk_buff *skb)
out:
NF_CT_STAT_INC(insert_failed);
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
return NF_DROP;
}
EXPORT_SYMBOL_GPL(__nf_conntrack_confirm);
@ -538,7 +538,7 @@ init_conntrack(const struct nf_conntrack_tuple *tuple,
return NULL;
}
write_lock_bh(&nf_conntrack_lock);
spin_lock_bh(&nf_conntrack_lock);
exp = nf_ct_find_expectation(tuple);
if (exp) {
pr_debug("conntrack: expectation arrives ct=%p exp=%p\n",
@ -576,7 +576,7 @@ init_conntrack(const struct nf_conntrack_tuple *tuple,
hlist_add_head(&conntrack->tuplehash[IP_CT_DIR_ORIGINAL].hnode,
&unconfirmed);
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
if (exp) {
if (exp->expectfn)
@ -787,7 +787,7 @@ void __nf_ct_refresh_acct(struct nf_conn *ct,
NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct);
NF_CT_ASSERT(skb);
write_lock_bh(&nf_conntrack_lock);
spin_lock_bh(&nf_conntrack_lock);
/* Only update if this is not a fixed timeout */
if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status))
@ -824,7 +824,7 @@ acct:
}
#endif
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
/* must be unlocked when calling event cache */
if (event)
@ -909,7 +909,7 @@ get_next_corpse(int (*iter)(struct nf_conn *i, void *data),
struct nf_conn *ct;
struct hlist_node *n;
write_lock_bh(&nf_conntrack_lock);
spin_lock_bh(&nf_conntrack_lock);
for (; *bucket < nf_conntrack_htable_size; (*bucket)++) {
hlist_for_each_entry(h, n, &nf_conntrack_hash[*bucket], hnode) {
ct = nf_ct_tuplehash_to_ctrack(h);
@ -922,11 +922,11 @@ get_next_corpse(int (*iter)(struct nf_conn *i, void *data),
if (iter(ct, data))
set_bit(IPS_DYING_BIT, &ct->status);
}
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
return NULL;
found:
atomic_inc(&ct->ct_general.use);
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
return ct;
}
@ -1055,7 +1055,7 @@ int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
* created because of a false negative won't make it into the hash
* though since that required taking the lock.
*/
write_lock_bh(&nf_conntrack_lock);
spin_lock_bh(&nf_conntrack_lock);
for (i = 0; i < nf_conntrack_htable_size; i++) {
while (!hlist_empty(&nf_conntrack_hash[i])) {
h = hlist_entry(nf_conntrack_hash[i].first,
@ -1073,7 +1073,7 @@ int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
nf_conntrack_vmalloc = vmalloced;
nf_conntrack_hash = hash;
nf_conntrack_hash_rnd = rnd;
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
nf_ct_free_hashtable(old_hash, old_vmalloced, old_size);
return 0;

12
net/netfilter/nf_conntrack_expect.c
View File

@ -65,9 +65,9 @@ static void nf_ct_expectation_timed_out(unsigned long ul_expect)
{
struct nf_conntrack_expect *exp = (void *)ul_expect;
write_lock_bh(&nf_conntrack_lock);
spin_lock_bh(&nf_conntrack_lock);
nf_ct_unlink_expect(exp);
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
nf_ct_expect_put(exp);
}
@ -201,12 +201,12 @@ static inline int expect_matches(const struct nf_conntrack_expect *a,
/* Generally a bad idea to call this: could have matched already. */
void nf_ct_unexpect_related(struct nf_conntrack_expect *exp)
{
write_lock_bh(&nf_conntrack_lock);
spin_lock_bh(&nf_conntrack_lock);
if (del_timer(&exp->timeout)) {
nf_ct_unlink_expect(exp);
nf_ct_expect_put(exp);
}
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
}
EXPORT_SYMBOL_GPL(nf_ct_unexpect_related);
@ -355,7 +355,7 @@ int nf_ct_expect_related(struct nf_conntrack_expect *expect)
NF_CT_ASSERT(master_help);
write_lock_bh(&nf_conntrack_lock);
spin_lock_bh(&nf_conntrack_lock);
if (!master_help->helper) {
ret = -ESHUTDOWN;
goto out;
@ -390,7 +390,7 @@ int nf_ct_expect_related(struct nf_conntrack_expect *expect)
nf_ct_expect_event(IPEXP_NEW, expect);
ret = 0;
out:
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
return ret;
}
EXPORT_SYMBOL_GPL(nf_ct_expect_related);

4
net/netfilter/nf_conntrack_h323_main.c
View File

@ -1415,7 +1415,7 @@ static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
nf_ct_refresh(ct, skb, info->timeout * HZ);
/* Set expect timeout */
read_lock_bh(&nf_conntrack_lock);
spin_lock_bh(&nf_conntrack_lock);
exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
info->sig_port[!dir]);
if (exp) {
@ -1425,7 +1425,7 @@ static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
NF_CT_DUMP_TUPLE(&exp->tuple);
set_expect_timeout(exp, info->timeout);
}
read_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
}
return 0;

4
net/netfilter/nf_conntrack_helper.c
View File

@ -138,7 +138,7 @@ void nf_conntrack_helper_unregister(struct nf_conntrack_helper *me)
*/
synchronize_rcu();
write_lock_bh(&nf_conntrack_lock);
spin_lock_bh(&nf_conntrack_lock);
/* Get rid of expectations */
for (i = 0; i < nf_ct_expect_hsize; i++) {
@ -160,7 +160,7 @@ void nf_conntrack_helper_unregister(struct nf_conntrack_helper *me)
hlist_for_each_entry(h, n, &nf_conntrack_hash[i], hnode)
unhelp(h, me);
}
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
}
EXPORT_SYMBOL_GPL(nf_conntrack_helper_unregister);

22
net/netfilter/nf_conntrack_netlink.c
View File

@ -1220,7 +1220,7 @@ ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
return err;
}
write_lock_bh(&nf_conntrack_lock);
spin_lock_bh(&nf_conntrack_lock);
if (cda[CTA_TUPLE_ORIG])
h = __nf_conntrack_find(&otuple, NULL);
else if (cda[CTA_TUPLE_REPLY])
@ -1248,7 +1248,7 @@ ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
atomic_inc(&master_ct->ct_general.use);
}
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
err = -ENOENT;
if (nlh->nlmsg_flags & NLM_F_CREATE)
err = ctnetlink_create_conntrack(cda,
@ -1281,7 +1281,7 @@ ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
}
out_unlock:
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
return err;
}
@ -1614,10 +1614,10 @@ ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
struct nf_conn_help *m_help;
/* delete all expectations for this helper */
write_lock_bh(&nf_conntrack_lock);
spin_lock_bh(&nf_conntrack_lock);
h = __nf_conntrack_helper_find_byname(name);
if (!h) {
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
return -EINVAL;
}
for (i = 0; i < nf_ct_expect_hsize; i++) {
@ -1632,10 +1632,10 @@ ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
}
}
}
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
} else {
/* This basically means we have to flush everything*/
write_lock_bh(&nf_conntrack_lock);
spin_lock_bh(&nf_conntrack_lock);
for (i = 0; i < nf_ct_expect_hsize; i++) {
hlist_for_each_entry_safe(exp, n, next,
&nf_ct_expect_hash[i],
@ -1646,7 +1646,7 @@ ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
}
}
}
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
}
return 0;
@ -1732,11 +1732,11 @@ ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
if (err < 0)
return err;
write_lock_bh(&nf_conntrack_lock);
spin_lock_bh(&nf_conntrack_lock);
exp = __nf_ct_expect_find(&tuple);
if (!exp) {
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
err = -ENOENT;
if (nlh->nlmsg_flags & NLM_F_CREATE)
err = ctnetlink_create_expect(cda, u3);
@ -1746,7 +1746,7 @@ ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
err = -EEXIST;
if (!(nlh->nlmsg_flags & NLM_F_EXCL))
err = ctnetlink_change_expect(exp, cda);
write_unlock_bh(&nf_conntrack_lock);
spin_unlock_bh(&nf_conntrack_lock);
return err;
}