Commit 2034d90a authored by Jiri Pirko's avatar Jiri Pirko Committed by David S. Miller
Browse files

net: treat possible_net_t net pointer as an RCU one and add read_pnet_rcu() 



Make the net pointer stored in possible_net_t structure annotated as
an RCU pointer. Change the access helpers to treat it as such.
Introduce read_pnet_rcu() helper to allow caller to dereference
the net pointer under RCU read lock.

Signed-off-by: default avatarJiri Pirko <jiri@nvidia.com>
Reviewed-by: default avatarSimon Horman <horms@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ee2a35fe

include/net/net_namespace.h

+12 −3
Original line number Diff line number Diff line
@@ -368,21 +368,30 @@ static inline void put_net_track(struct net *net, netns_tracker *tracker) 


typedef struct {

#ifdef CONFIG_NET_NS

	struct net *net;

	struct net __rcu *net;

#endif

} possible_net_t;



static inline void write_pnet(possible_net_t *pnet, struct net *net)

{

#ifdef CONFIG_NET_NS

	pnet->net = net;

	rcu_assign_pointer(pnet->net, net);

#endif

}



static inline struct net *read_pnet(const possible_net_t *pnet)

{

#ifdef CONFIG_NET_NS

	return pnet->net;

	return rcu_dereference_protected(pnet->net, true);

#else

	return &init_net;

#endif

}



static inline struct net *read_pnet_rcu(possible_net_t *pnet)

{

#ifdef CONFIG_NET_NS

	return rcu_dereference(pnet->net);

#else

	return &init_net;

#endif