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| author | Eric W. Biederman <ebiederm@xmission.com> | 2007-09-26 22:40:08 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-10-10 16:52:55 -0700 |
| commit | f4618d39a34dab316090263b42cd8799f31ce277 (patch) | |
| tree | 75db202b492da1797145fde455b0c4c89cf41767 /include/net/net_namespace.h | |
| parent | 32db927686f6d475fc05b6229f82ed576c0c8096 (diff) | |
| download | linux-f4618d39a34dab316090263b42cd8799f31ce277.tar.gz linux-f4618d39a34dab316090263b42cd8799f31ce277.tar.bz2 linux-f4618d39a34dab316090263b42cd8799f31ce277.zip | |
[NETNS]: Simplify the network namespace list locking rules.
Denis V. Lunev <den@sw.ru> noticed that the locking rules
for the network namespace list are over complicated and broken.
In particular the current register_netdev_notifier currently
does not take any lock making the for_each_net iteration racy
with network namespace creation and destruction. Oops.
The fact that we need to use for_each_net in rtnl_unlock() when
the rtnetlink support becomes per network namespace makes designing
the proper locking tricky. In addition we need to be able to call
rtnl_lock() and rtnl_unlock() when we have the net_mutex held.
After thinking about it and looking at the alternatives carefully
it looks like the simplest and most maintainable solution is
to remove net_list_mutex altogether, and to use the rtnl_mutex instead.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/net_namespace.h')
| -rw-r--r-- | include/net/net_namespace.h | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h index 13b0e3b547f0..934c840b5941 100644 --- a/include/net/net_namespace.h +++ b/include/net/net_namespace.h @@ -96,9 +96,6 @@ static inline void release_net(struct net *net) #endif } -extern void net_lock(void); -extern void net_unlock(void); - #define for_each_net(VAR) \ list_for_each_entry(VAR, &net_namespace_list, list) |