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ipv6: use RCU to walk list of network devices

Sfoglia il codice sorgente 
No longer need read_lock(&dev_base_lock), use RCU instead.
We also can avoid taking references on inet6_dev structs.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2009-11-11 17:34:30 +00:00
committato da David S. Miller
parent bee7ca9ec0
commit ce81b76a39
3 ha cambiato i file con 47 aggiunte e 43 eliminazioni
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29
net/ipv6/anycast.c
Vedi File

@@ -431,9 +431,9 @@ static inline struct ifacaddr6 *ac6_get_first(struct seq_file *seq)
struct net *net = seq_file_net(seq);
state->idev = NULL;
for_each_netdev(net, state->dev) {
for_each_netdev_rcu(net, state->dev) {
struct inet6_dev *idev;
idev = in6_dev_get(state->dev);
idev = __in6_dev_get(state->dev);
if (!idev)
continue;
read_lock_bh(&idev->lock);
@@ -443,7 +443,6 @@ static inline struct ifacaddr6 *ac6_get_first(struct seq_file *seq)
break;
}
read_unlock_bh(&idev->lock);
in6_dev_put(idev);
}
return im;
}
@@ -454,16 +453,15 @@ static struct ifacaddr6 *ac6_get_next(struct seq_file *seq, struct ifacaddr6 *im
im = im->aca_next;
while (!im) {
if (likely(state->idev != NULL)) {
if (likely(state->idev != NULL))
read_unlock_bh(&state->idev->lock);
in6_dev_put(state->idev);
}
state->dev = next_net_device(state->dev);
state->dev = next_net_device_rcu(state->dev);
if (!state->dev) {
state->idev = NULL;
break;
}
state->idev = in6_dev_get(state->dev);
state->idev = __in6_dev_get(state->dev);
if (!state->idev)
continue;
read_lock_bh(&state->idev->lock);
@@ -482,29 +480,30 @@ static struct ifacaddr6 *ac6_get_idx(struct seq_file *seq, loff_t pos)
}
static void *ac6_seq_start(struct seq_file *seq, loff_t *pos)
__acquires(dev_base_lock)
__acquires(RCU)
{
read_lock(&dev_base_lock);
rcu_read_lock();
return ac6_get_idx(seq, *pos);
}
static void *ac6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
struct ifacaddr6 *im;
im = ac6_get_next(seq, v);
struct ifacaddr6 *im = ac6_get_next(seq, v);
++*pos;
return im;
}
static void ac6_seq_stop(struct seq_file *seq, void *v)
__releases(dev_base_lock)
__releases(RCU)
{
struct ac6_iter_state *state = ac6_seq_private(seq);
if (likely(state->idev != NULL)) {
read_unlock_bh(&state->idev->lock);
in6_dev_put(state->idev);
state->idev = NULL;
}
read_unlock(&dev_base_lock);
rcu_read_unlock();
}
static int ac6_seq_show(struct seq_file *seq, void *v)