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net: Allow xfrm_user_net_exit to batch efficiently.

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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>
This commit is contained in:
Eric W. Biederman 2009-12-03 02:29:05 +00:00 • committed by David S. Miller
parent 04dc7f6be3
commit d79d792ef9
2 changed files with 11 additions and 8 deletions
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1
include/net/netns/xfrm.h
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@ -43,6 +43,7 @@ struct netns_xfrm {
struct work_struct policy_hash_work;
struct sock *nlsk;
struct sock *nlsk_stash;
u32 sysctl_aevent_etime;
u32 sysctl_aevent_rseqth;