netns: make nsid_lock per net
The spinlock is used to protect netns_ids which is per net, so there is no need to use a global spinlock. Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
4ab7f91381
commit
de133464c9
2 changed files with 17 additions and 16 deletions
|
@ -58,6 +58,7 @@ struct net {
|
|||
struct list_head exit_list; /* Use only net_mutex */
|
||||
|
||||
struct user_namespace *user_ns; /* Owning user namespace */
|
||||
spinlock_t nsid_lock;
|
||||
struct idr netns_ids;
|
||||
|
||||
struct ns_common ns;
|
||||
|
|
|
@ -28,7 +28,6 @@
|
|||
static LIST_HEAD(pernet_list);
|
||||
static struct list_head *first_device = &pernet_list;
|
||||
DEFINE_MUTEX(net_mutex);
|
||||
static DEFINE_SPINLOCK(nsid_lock);
|
||||
|
||||
LIST_HEAD(net_namespace_list);
|
||||
EXPORT_SYMBOL_GPL(net_namespace_list);
|
||||
|
@ -218,10 +217,10 @@ int peernet2id_alloc(struct net *net, struct net *peer)
|
|||
bool alloc;
|
||||
int id;
|
||||
|
||||
spin_lock_irqsave(&nsid_lock, flags);
|
||||
spin_lock_irqsave(&net->nsid_lock, flags);
|
||||
alloc = atomic_read(&peer->count) == 0 ? false : true;
|
||||
id = __peernet2id_alloc(net, peer, &alloc);
|
||||
spin_unlock_irqrestore(&nsid_lock, flags);
|
||||
spin_unlock_irqrestore(&net->nsid_lock, flags);
|
||||
if (alloc && id >= 0)
|
||||
rtnl_net_notifyid(net, RTM_NEWNSID, id);
|
||||
return id;
|
||||
|
@ -234,9 +233,9 @@ int peernet2id(struct net *net, struct net *peer)
|
|||
unsigned long flags;
|
||||
int id;
|
||||
|
||||
spin_lock_irqsave(&nsid_lock, flags);
|
||||
spin_lock_irqsave(&net->nsid_lock, flags);
|
||||
id = __peernet2id(net, peer);
|
||||
spin_unlock_irqrestore(&nsid_lock, flags);
|
||||
spin_unlock_irqrestore(&net->nsid_lock, flags);
|
||||
return id;
|
||||
}
|
||||
|
||||
|
@ -257,11 +256,11 @@ struct net *get_net_ns_by_id(struct net *net, int id)
|
|||
return NULL;
|
||||
|
||||
rcu_read_lock();
|
||||
spin_lock_irqsave(&nsid_lock, flags);
|
||||
spin_lock_irqsave(&net->nsid_lock, flags);
|
||||
peer = idr_find(&net->netns_ids, id);
|
||||
if (peer)
|
||||
get_net(peer);
|
||||
spin_unlock_irqrestore(&nsid_lock, flags);
|
||||
spin_unlock_irqrestore(&net->nsid_lock, flags);
|
||||
rcu_read_unlock();
|
||||
|
||||
return peer;
|
||||
|
@ -282,6 +281,7 @@ static __net_init int setup_net(struct net *net, struct user_namespace *user_ns)
|
|||
net->dev_base_seq = 1;
|
||||
net->user_ns = user_ns;
|
||||
idr_init(&net->netns_ids);
|
||||
spin_lock_init(&net->nsid_lock);
|
||||
|
||||
list_for_each_entry(ops, &pernet_list, list) {
|
||||
error = ops_init(ops, net);
|
||||
|
@ -404,17 +404,17 @@ static void cleanup_net(struct work_struct *work)
|
|||
for_each_net(tmp) {
|
||||
int id;
|
||||
|
||||
spin_lock_irq(&nsid_lock);
|
||||
spin_lock_irq(&tmp->nsid_lock);
|
||||
id = __peernet2id(tmp, net);
|
||||
if (id >= 0)
|
||||
idr_remove(&tmp->netns_ids, id);
|
||||
spin_unlock_irq(&nsid_lock);
|
||||
spin_unlock_irq(&tmp->nsid_lock);
|
||||
if (id >= 0)
|
||||
rtnl_net_notifyid(tmp, RTM_DELNSID, id);
|
||||
}
|
||||
spin_lock_irq(&nsid_lock);
|
||||
spin_lock_irq(&net->nsid_lock);
|
||||
idr_destroy(&net->netns_ids);
|
||||
spin_unlock_irq(&nsid_lock);
|
||||
spin_unlock_irq(&net->nsid_lock);
|
||||
|
||||
}
|
||||
rtnl_unlock();
|
||||
|
@ -563,15 +563,15 @@ static int rtnl_net_newid(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|||
if (IS_ERR(peer))
|
||||
return PTR_ERR(peer);
|
||||
|
||||
spin_lock_irqsave(&nsid_lock, flags);
|
||||
spin_lock_irqsave(&net->nsid_lock, flags);
|
||||
if (__peernet2id(net, peer) >= 0) {
|
||||
spin_unlock_irqrestore(&nsid_lock, flags);
|
||||
spin_unlock_irqrestore(&net->nsid_lock, flags);
|
||||
err = -EEXIST;
|
||||
goto out;
|
||||
}
|
||||
|
||||
err = alloc_netid(net, peer, nsid);
|
||||
spin_unlock_irqrestore(&nsid_lock, flags);
|
||||
spin_unlock_irqrestore(&net->nsid_lock, flags);
|
||||
if (err >= 0) {
|
||||
rtnl_net_notifyid(net, RTM_NEWNSID, err);
|
||||
err = 0;
|
||||
|
@ -695,9 +695,9 @@ static int rtnl_net_dumpid(struct sk_buff *skb, struct netlink_callback *cb)
|
|||
};
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&nsid_lock, flags);
|
||||
spin_lock_irqsave(&net->nsid_lock, flags);
|
||||
idr_for_each(&net->netns_ids, rtnl_net_dumpid_one, &net_cb);
|
||||
spin_unlock_irqrestore(&nsid_lock, flags);
|
||||
spin_unlock_irqrestore(&net->nsid_lock, flags);
|
||||
|
||||
cb->args[0] = net_cb.idx;
|
||||
return skb->len;
|
||||
|
|
Loading…
Reference in a new issue