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| author | Eric W. Biederman <ebiederm@xmission.com> | 2009-12-03 02:29:05 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-12-03 12:22:03 -0800 |
| commit | d79d792ef9f99cca463b6619a93e860d1c833a6e (patch) | |
| tree | 06d8a085701546be48ac104fd4f2413a6371180c /net | |
| parent | 04dc7f6be3a7b308f8545bb45772c9fb75f71aca (diff) | |
| download | linux-d79d792ef9f99cca463b6619a93e860d1c833a6e.tar.gz linux-d79d792ef9f99cca463b6619a93e860d1c833a6e.tar.bz2 linux-d79d792ef9f99cca463b6619a93e860d1c833a6e.zip | |
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')
| -rw-r--r-- | net/xfrm/xfrm_user.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c index fb42d778d278..1ada6186933c 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) |