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authorAl Viro <viro@zeniv.linux.org.uk>2011-06-08 21:13:01 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2011-06-12 17:45:41 -0400
commita685e08987d1edf1995b76511d4c98ea0e905377 (patch)
tree1d42593e2bc320f8d93b98851b2df0fd432e3859 /include/linux/sysfs.h
parentdde194a64bb5c3fd05d965775dc92e8a4920a53a (diff)
Delay struct net freeing while there's a sysfs instance refering to it
* new refcount in struct net, controlling actual freeing of the memory * new method in kobj_ns_type_operations (->drop_ns()) * ->current_ns() semantics change - it's supposed to be followed by corresponding ->drop_ns(). For struct net in case of CONFIG_NET_NS it bumps the new refcount; net_drop_ns() decrements it and calls net_free() if the last reference has been dropped. Method renamed to ->grab_current_ns(). * old net_free() callers call net_drop_ns() instead. * sysfs_exit_ns() is gone, along with a large part of callchain leading to it; now that the references stored in ->ns[...] stay valid we do not need to hunt them down and replace them with NULL. That fixes problems in sysfs_lookup() and sysfs_readdir(), along with getting rid of sb->s_instances abuse. Note that struct net *shutdown* logics has not changed - net_cleanup() is called exactly when it used to be called. The only thing postponed by having a sysfs instance refering to that struct net is actual freeing of memory occupied by struct net. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/sysfs.h')
-rw-r--r--include/linux/sysfs.h7
1 files changed, 0 insertions, 7 deletions
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index c3acda60eee0..e2696d76a599 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -177,9 +177,6 @@ struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd);
void sysfs_put(struct sysfs_dirent *sd);
-/* Called to clear a ns tag when it is no longer valid */
-void sysfs_exit_ns(enum kobj_ns_type type, const void *tag);
-
int __must_check sysfs_init(void);
#else /* CONFIG_SYSFS */
@@ -338,10 +335,6 @@ static inline void sysfs_put(struct sysfs_dirent *sd)
{
}
-static inline void sysfs_exit_ns(int type, const void *tag)
-{
-}
-
static inline int __must_check sysfs_init(void)
{
return 0;