Commit 20453d88 authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'possible_net_t' 



Eric W. Biederman says:

====================
Introduce possible_net_t

The current usage of write_pnet and read_pnet is a little laborious and
error prone as you only notice if you failed to include them if are
compiling with network namespaces enabled.

possible_net_t remedies that by using a type that is 0 bytes when
network namespaces are disabled and can only be read and written to with
read_pnet and write_pnet.

Aka less work and safer for the same effect.

I kill hold_net and release_net first as are they are haven't been used
since 2008 and are noise at the points where write_pnet and read_pnet
are used.

I have folded in Eric Dumazets suggestions to improve the killing of
hold_net and release net.  And respon.  I had to respin anyway as
there was enough changes elsewhere in the tree the previous version
of these patches did not quite apply cleanly.
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 6c7005f6 0c5c9fb5

include/linux/netdevice.h

+2 −7
Original line number Diff line number Diff line
@@ -1721,9 +1721,7 @@ struct net_device { 
	struct netpoll_info __rcu	*npinfo;

#endif



#ifdef CONFIG_NET_NS

	struct net		*nd_net;

#endif

	possible_net_t			nd_net;



	/* mid-layer private */

	union {
@@ -1863,10 +1861,7 @@ struct net *dev_net(const struct net_device *dev) 
static inline

void dev_net_set(struct net_device *dev, struct net *net)

{

#ifdef CONFIG_NET_NS

	release_net(dev->nd_net);

	dev->nd_net = hold_net(net);

#endif

	write_pnet(&dev->nd_net, net);

}



static inline bool netdev_uses_dsa(struct net_device *dev)

include/net/cfg80211.h

+1 −3
Original line number Diff line number Diff line
@@ -3183,10 +3183,8 @@ struct wiphy { 
	const struct ieee80211_ht_cap *ht_capa_mod_mask;

	const struct ieee80211_vht_cap *vht_capa_mod_mask;



#ifdef CONFIG_NET_NS

	/* the network namespace this phy lives in currently */

	struct net *_net;

#endif

	possible_net_t _net;



#ifdef CONFIG_CFG80211_WEXT

	const struct iw_handler_def *wext;

include/net/fib_rules.h

+1 −8
Original line number Diff line number Diff line
@@ -95,17 +95,10 @@ static inline void fib_rule_get(struct fib_rule *rule) 
	atomic_inc(&rule->refcnt);

}



static inline void fib_rule_put_rcu(struct rcu_head *head)

{

	struct fib_rule *rule = container_of(head, struct fib_rule, rcu);

	release_net(rule->fr_net);

	kfree(rule);

}



static inline void fib_rule_put(struct fib_rule *rule)

{

	if (atomic_dec_and_test(&rule->refcnt))

		call_rcu(&rule->rcu, fib_rule_put_rcu);

		kfree_rcu(rule, rcu);

}



static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)

include/net/genetlink.h

+1 −3
Original line number Diff line number Diff line
@@ -92,9 +92,7 @@ struct genl_info { 
	struct genlmsghdr *	genlhdr;

	void *			userhdr;

	struct nlattr **	attrs;

#ifdef CONFIG_NET_NS

	struct net *		_net;

#endif

	possible_net_t		_net;

	void *			user_ptr[2];

	struct sock *		dst_sk;

};

include/net/inet_hashtables.h

+1 −3
Original line number Diff line number Diff line
@@ -76,9 +76,7 @@ struct inet_ehash_bucket { 
 * ports are created in O(1) time?  I thought so. ;-)	-DaveM

 */

struct inet_bind_bucket {

#ifdef CONFIG_NET_NS

	struct net		*ib_net;

#endif

	possible_net_t		ib_net;

	unsigned short		port;

	signed char		fastreuse;

	signed char		fastreuseport;

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