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authorEric W. Biederman <ebiederm@xmission.com>2009-12-03 02:29:05 +0000
committerDavid S. Miller <davem@davemloft.net>2009-12-03 12:22:03 -0800
commitd79d792ef9f99cca463b6619a93e860d1c833a6e (patch)
tree06d8a085701546be48ac104fd4f2413a6371180c /net/xfrm
parent04dc7f6be3a7b308f8545bb45772c9fb75f71aca (diff)
downloadlinux-2.6.34-ux500-d79d792ef9f99cca463b6619a93e860d1c833a6e.tar.gz
net: Allow xfrm_user_net_exit to batch efficiently.
xfrm.nlsk is provided by the xfrm_user module and is access via rcu from other parts of the xfrm code. Add xfrm.nlsk_stash a copy of xfrm.nlsk that will never be set to NULL. This allows the synchronize_net and netlink_kernel_release to be deferred until a whole batch of xfrm.nlsk sockets have been set to NULL. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/xfrm')
-rw-r--r--net/xfrm/xfrm_user.c18
1 files changed, 10 insertions, 8 deletions
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index fb42d778d27..1ada6186933 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -2721,22 +2721,24 @@ static int __net_init xfrm_user_net_init(struct net *net)
xfrm_netlink_rcv, NULL, THIS_MODULE);
if (nlsk == NULL)
return -ENOMEM;
+ net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
rcu_assign_pointer(net->xfrm.nlsk, nlsk);
return 0;
}
-static void __net_exit xfrm_user_net_exit(struct net *net)
+static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
{
- struct sock *nlsk = net->xfrm.nlsk;
-
- rcu_assign_pointer(net->xfrm.nlsk, NULL);
- synchronize_rcu();
- netlink_kernel_release(nlsk);
+ struct net *net;
+ list_for_each_entry(net, net_exit_list, exit_list)
+ rcu_assign_pointer(net->xfrm.nlsk, NULL);
+ synchronize_net();
+ list_for_each_entry(net, net_exit_list, exit_list)
+ netlink_kernel_release(net->xfrm.nlsk_stash);
}
static struct pernet_operations xfrm_user_net_ops = {
- .init = xfrm_user_net_init,
- .exit = xfrm_user_net_exit,
+ .init = xfrm_user_net_init,
+ .exit_batch = xfrm_user_net_exit,
};
static int __init xfrm_user_init(void)