diff options
| author | Patrick McHardy <kaber@trash.net> | 2008-01-31 13:38:19 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-02-01 04:27:53 +0100 |
| commit | 7d0742da1c8f5df3a34030f0170b30d1a052be80 (patch) | |
| tree | f5717a37a9b4fe27abfa7886996d7051c57b91b9 /net/ipv4 | |
| parent | [NETFILTER]: nf_conntrack_core: avoid taking nf_conntrack_lock in nf_conntrac... (diff) | |
| download | linux-7d0742da1c8f5df3a34030f0170b30d1a052be80.tar.xz linux-7d0742da1c8f5df3a34030f0170b30d1a052be80.zip | |
[NETFILTER]: nf_conntrack_expect: use RCU for expectation hash
Use RCU for expectation hash. This doesn't buy much for conntrack
runtime performance, but allows to reduce the use of nf_conntrack_lock
for /proc and nf_netlink_conntrack.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c index 543c02b74c96..2fdcd9233a03 100644 --- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c +++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c @@ -191,10 +191,12 @@ struct ct_expect_iter_state { static struct hlist_node *ct_expect_get_first(struct seq_file *seq) { struct ct_expect_iter_state *st = seq->private; + struct hlist_node *n; for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) { - if (!hlist_empty(&nf_ct_expect_hash[st->bucket])) - return nf_ct_expect_hash[st->bucket].first; + n = rcu_dereference(nf_ct_expect_hash[st->bucket].first); + if (n) + return n; } return NULL; } @@ -204,11 +206,11 @@ static struct hlist_node *ct_expect_get_next(struct seq_file *seq, { struct ct_expect_iter_state *st = seq->private; - head = head->next; + head = rcu_dereference(head->next); while (head == NULL) { if (++st->bucket >= nf_ct_expect_hsize) return NULL; - head = nf_ct_expect_hash[st->bucket].first; + head = rcu_dereference(nf_ct_expect_hash[st->bucket].first); } return head; } @@ -225,7 +227,7 @@ static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos) static void *exp_seq_start(struct seq_file *seq, loff_t *pos) { - read_lock_bh(&nf_conntrack_lock); + rcu_read_lock(); return ct_expect_get_idx(seq, *pos); } @@ -237,7 +239,7 @@ static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos) static void exp_seq_stop(struct seq_file *seq, void *v) { - read_unlock_bh(&nf_conntrack_lock); + rcu_read_unlock(); } static int exp_seq_show(struct seq_file *s, void *v) |