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 */ 61