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author | Al Viro <viro@zeniv.linux.org.uk> | 2011-06-08 21:13:01 -0400 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2011-06-12 17:45:41 -0400 |
commit | a685e08987d1edf1995b76511d4c98ea0e905377 (patch) | |
tree | 1d42593e2bc320f8d93b98851b2df0fd432e3859 /fs/namei.c | |
parent | dde194a64bb5c3fd05d965775dc92e8a4920a53a (diff) | |
download | op-kernel-dev-a685e08987d1edf1995b76511d4c98ea0e905377.zip op-kernel-dev-a685e08987d1edf1995b76511d4c98ea0e905377.tar.gz |
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 'fs/namei.c')
0 files changed, 0 insertions, 0 deletions