mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Al Viro](/assets/img/avatar_default.png)
* 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>
58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
/* Kernel object name space definitions
|
|
*
|
|
* Copyright (c) 2002-2003 Patrick Mochel
|
|
* Copyright (c) 2002-2003 Open Source Development Labs
|
|
* Copyright (c) 2006-2008 Greg Kroah-Hartman <greg@kroah.com>
|
|
* Copyright (c) 2006-2008 Novell Inc.
|
|
*
|
|
* Split from kobject.h by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This file is released under the GPLv2.
|
|
*
|
|
* Please read Documentation/kobject.txt before using the kobject
|
|
* interface, ESPECIALLY the parts about reference counts and object
|
|
* destructors.
|
|
*/
|
|
|
|
#ifndef _LINUX_KOBJECT_NS_H
|
|
#define _LINUX_KOBJECT_NS_H
|
|
|
|
struct sock;
|
|
struct kobject;
|
|
|
|
/*
|
|
* Namespace types which are used to tag kobjects and sysfs entries.
|
|
* Network namespace will likely be the first.
|
|
*/
|
|
enum kobj_ns_type {
|
|
KOBJ_NS_TYPE_NONE = 0,
|
|
KOBJ_NS_TYPE_NET,
|
|
KOBJ_NS_TYPES
|
|
};
|
|
|
|
/*
|
|
* Callbacks so sysfs can determine namespaces
|
|
* @grab_current_ns: return a new reference to calling task's namespace
|
|
* @netlink_ns: return namespace to which a sock belongs (right?)
|
|
* @initial_ns: return the initial namespace (i.e. init_net_ns)
|
|
* @drop_ns: drops a reference to namespace
|
|
*/
|
|
struct kobj_ns_type_operations {
|
|
enum kobj_ns_type type;
|
|
void *(*grab_current_ns)(void);
|
|
const void *(*netlink_ns)(struct sock *sk);
|
|
const void *(*initial_ns)(void);
|
|
void (*drop_ns)(void *);
|
|
};
|
|
|
|
int kobj_ns_type_register(const struct kobj_ns_type_operations *ops);
|
|
int kobj_ns_type_registered(enum kobj_ns_type type);
|
|
const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent);
|
|
const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj);
|
|
|
|
void *kobj_ns_grab_current(enum kobj_ns_type type);
|
|
const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk);
|
|
const void *kobj_ns_initial(enum kobj_ns_type type);
|
|
void kobj_ns_drop(enum kobj_ns_type type, void *ns);
|
|
|
|
#endif /* _LINUX_KOBJECT_NS_H */
|