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[NETNS]: Make netns refconting debug like a socket one. 

Make release_net/hold_net noop for performance-hungry people. This is a debug
staff and should be used in the debug mode only.

Add check for net != NULL in hold/release calls. This will be required
later on.

[ Added minor simplifications suggested by Brian Haley. -DaveM ]

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Denis V. Lunev 2008-04-16 01:58:04 -07:00 committed by David S. Miller
parent 554eb27782
commit 5d1e4468a7
2 changed files with 32 additions and 20 deletions
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48
include/net/net_namespace.h
View File

@ -26,9 +26,11 @@ struct net {
atomic_t count; /* To decided when the network
* namespace should be freed.
*/
#ifdef NETNS_REFCNT_DEBUG
atomic_t use_count; /* To track references we
* destroy on demand
*/
#endif
struct list_head list; /* list of network namespaces */
struct work_struct work; /* work struct for freeing */
@ -117,17 +119,6 @@ static inline void put_net(struct net *net)
__put_net(net);
}
static inline struct net *hold_net(struct net *net)
{
atomic_inc(&net->use_count);
return net;
}
static inline void release_net(struct net *net)
{
atomic_dec(&net->use_count);
}
static inline
int net_eq(const struct net *net1, const struct net *net2)
{
@ -143,15 +134,6 @@ static inline void put_net(struct net *net)
{
}
static inline struct net *hold_net(struct net *net)
{
return net;
}
static inline void release_net(struct net *net)
{
}
static inline struct net *maybe_get_net(struct net *net)
{
return net;
@ -164,6 +146,32 @@ int net_eq(const struct net *net1, const struct net *net2)
}
#endif
#ifdef NETNS_REFCNT_DEBUG
static inline struct net *hold_net(struct net *net)
{
if (net)
atomic_inc(&net->use_count);
return net;
}
static inline void release_net(struct net *net)
{
if (net)
atomic_dec(&net->use_count);
}
#else
static inline struct net *hold_net(struct net *net)
{
return net;
}
static inline void release_net(struct net *net)
{
}
#endif
#define for_each_net(VAR) \
list_for_each_entry(VAR, &net_namespace_list, list)

4
net/core/net_namespace.c
View File

@ -35,7 +35,9 @@ static __net_init int setup_net(struct net *net)
struct net_generic *ng;
atomic_set(&net->count, 1);
#ifdef NETNS_REFCNT_DEBUG
atomic_set(&net->use_count, 0);
#endif
error = -ENOMEM;
ng = kzalloc(sizeof(struct net_generic) +
@ -86,11 +88,13 @@ static void net_free(struct net *net)
if (!net)
return;
#ifdef NETNS_REFCNT_DEBUG
if (unlikely(atomic_read(&net->use_count) != 0)) {
printk(KERN_EMERG "network namespace not free! Usage: %d\n",
atomic_read(&net->use_count));
return;
}
#endif
kmem_cache_free(net_cachep, net);
}