a685e08987
* 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>
59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
/* Kernel object name space definitions
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*
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* Copyright (c) 2002-2003 Patrick Mochel
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* Copyright (c) 2002-2003 Open Source Development Labs
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* Copyright (c) 2006-2008 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (c) 2006-2008 Novell Inc.
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*
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* Split from kobject.h by David Howells (dhowells@redhat.com)
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*
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* This file is released under the GPLv2.
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*
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* Please read Documentation/kobject.txt before using the kobject
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* interface, ESPECIALLY the parts about reference counts and object
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* destructors.
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*/
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#ifndef _LINUX_KOBJECT_NS_H
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#define _LINUX_KOBJECT_NS_H
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struct sock;
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struct kobject;
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/*
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* Namespace types which are used to tag kobjects and sysfs entries.
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* Network namespace will likely be the first.
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*/
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enum kobj_ns_type {
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KOBJ_NS_TYPE_NONE = 0,
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KOBJ_NS_TYPE_NET,
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KOBJ_NS_TYPES
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};
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/*
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* Callbacks so sysfs can determine namespaces
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* @grab_current_ns: return a new reference to calling task's namespace
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* @netlink_ns: return namespace to which a sock belongs (right?)
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* @initial_ns: return the initial namespace (i.e. init_net_ns)
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* @drop_ns: drops a reference to namespace
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*/
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struct kobj_ns_type_operations {
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enum kobj_ns_type type;
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void *(*grab_current_ns)(void);
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const void *(*netlink_ns)(struct sock *sk);
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const void *(*initial_ns)(void);
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void (*drop_ns)(void *);
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};
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int kobj_ns_type_register(const struct kobj_ns_type_operations *ops);
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int kobj_ns_type_registered(enum kobj_ns_type type);
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const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent);
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const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj);
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void *kobj_ns_grab_current(enum kobj_ns_type type);
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const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk);
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const void *kobj_ns_initial(enum kobj_ns_type type);
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void kobj_ns_drop(enum kobj_ns_type type, void *ns);
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#endif /* _LINUX_KOBJECT_NS_H */
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