include/linux/kobject_ns.h

   1 /* Kernel object name space definitions
   2  *
   3  * Copyright (c) 2002-2003 Patrick Mochel
   4  * Copyright (c) 2002-2003 Open Source Development Labs
   5  * Copyright (c) 2006-2008 Greg Kroah-Hartman <greg@kroah.com>
   6  * Copyright (c) 2006-2008 Novell Inc.
   7  *
   8  * Split from kobject.h by David Howells (dhowells@redhat.com)
   9  *
  10  * This file is released under the GPLv2.
  11  *
  12  * Please read Documentation/kobject.txt before using the kobject
  13  * interface, ESPECIALLY the parts about reference counts and object
  14  * destructors.
  15  */
  16
  17 #ifndef _LINUX_KOBJECT_NS_H
  18 #define _LINUX_KOBJECT_NS_H
  19
  20 struct sock;
  21 struct kobject;
  22
  23 /*
  24  * Namespace types which are used to tag kobjects and sysfs entries.
  25  * Network namespace will likely be the first.
  26  */
  27 enum kobj_ns_type {
  28         KOBJ_NS_TYPE_NONE = 0,
  29         KOBJ_NS_TYPE_NET,
  30         KOBJ_NS_TYPES
  31 };
  32
  33 /*
  34  * Callbacks so sysfs can determine namespaces
  35  *   @grab_current_ns: return a new reference to calling task's namespace
  36  *   @netlink_ns: return namespace to which a sock belongs (right?)
  37  *   @initial_ns: return the initial namespace (i.e. init_net_ns)
  38  *   @drop_ns: drops a reference to namespace
  39  */
  40 struct kobj_ns_type_operations {
  41         enum kobj_ns_type type;
  42         bool (*current_may_mount)(void);
  43         void *(*grab_current_ns)(void);
  44         const void *(*netlink_ns)(struct sock *sk);
  45         const void *(*initial_ns)(void);
  46         void (*drop_ns)(void *);
  47 };
  48
  49 int kobj_ns_type_register(const struct kobj_ns_type_operations *ops);
  50 int kobj_ns_type_registered(enum kobj_ns_type type);
  51 const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent);
  52 const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj);
  53
  54 bool kobj_ns_current_may_mount(enum kobj_ns_type type);
  55 void *kobj_ns_grab_current(enum kobj_ns_type type);
  56 const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk);
  57 const void *kobj_ns_initial(enum kobj_ns_type type);
  58 void kobj_ns_drop(enum kobj_ns_type type, void *ns);
  59
  60 #endif /* _LINUX_KOBJECT_NS_H */