2 * kobject.c - library routines for handling generic kernel objects
4 * Copyright (c) 2002-2003 Patrick Mochel <mochel@osdl.org>
5 * Copyright (c) 2006-2007 Greg Kroah-Hartman <greg@kroah.com>
6 * Copyright (c) 2006-2007 Novell Inc.
8 * This file is released under the GPLv2.
11 * Please see the file Documentation/kobject.txt for critical information
12 * about using the kobject interface.
15 #include <linux/kobject.h>
16 #include <linux/string.h>
17 #include <linux/export.h>
18 #include <linux/stat.h>
19 #include <linux/slab.h>
20 #include <linux/random.h>
23 * kobject_namespace - return @kobj's namespace tag
24 * @kobj: kobject in question
26 * Returns namespace tag of @kobj if its parent has namespace ops enabled
27 * and thus @kobj should have a namespace tag associated with it. Returns
30 const void *kobject_namespace(struct kobject *kobj)
32 const struct kobj_ns_type_operations *ns_ops = kobj_ns_ops(kobj);
34 if (!ns_ops || ns_ops->type == KOBJ_NS_TYPE_NONE)
37 return kobj->ktype->namespace(kobj);
41 * populate_dir - populate directory with attributes.
42 * @kobj: object we're working on.
44 * Most subsystems have a set of default attributes that are associated
45 * with an object that registers with them. This is a helper called during
46 * object registration that loops through the default attributes of the
47 * subsystem and creates attributes files for them in sysfs.
49 static int populate_dir(struct kobject *kobj)
51 struct kobj_type *t = get_ktype(kobj);
52 struct attribute *attr;
56 if (t && t->default_attrs) {
57 for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) {
58 error = sysfs_create_file(kobj, attr);
66 static int create_dir(struct kobject *kobj)
68 const struct kobj_ns_type_operations *ops;
71 error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj));
75 error = populate_dir(kobj);
77 sysfs_remove_dir(kobj);
82 * @kobj->sd may be deleted by an ancestor going away. Hold an
83 * extra reference so that it stays until @kobj is gone.
88 * If @kobj has ns_ops, its children need to be filtered based on
89 * their namespace tags. Enable namespace support on @kobj->sd.
91 ops = kobj_child_ns_ops(kobj);
93 BUG_ON(ops->type <= KOBJ_NS_TYPE_NONE);
94 BUG_ON(ops->type >= KOBJ_NS_TYPES);
95 BUG_ON(!kobj_ns_type_registered(ops->type));
97 sysfs_enable_ns(kobj->sd);
103 static int get_kobj_path_length(struct kobject *kobj)
106 struct kobject *parent = kobj;
108 /* walk up the ancestors until we hit the one pointing to the
110 * Add 1 to strlen for leading '/' of each level.
113 if (kobject_name(parent) == NULL)
115 length += strlen(kobject_name(parent)) + 1;
116 parent = parent->parent;
121 static void fill_kobj_path(struct kobject *kobj, char *path, int length)
123 struct kobject *parent;
126 for (parent = kobj; parent; parent = parent->parent) {
127 int cur = strlen(kobject_name(parent));
128 /* back up enough to print this name with '/' */
130 strncpy(path + length, kobject_name(parent), cur);
131 *(path + --length) = '/';
134 pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj),
135 kobj, __func__, path);
139 * kobject_get_path - generate and return the path associated with a given kobj and kset pair.
141 * @kobj: kobject in question, with which to build the path
142 * @gfp_mask: the allocation type used to allocate the path
144 * The result must be freed by the caller with kfree().
146 char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask)
151 len = get_kobj_path_length(kobj);
154 path = kzalloc(len, gfp_mask);
157 fill_kobj_path(kobj, path, len);
161 EXPORT_SYMBOL_GPL(kobject_get_path);
163 /* add the kobject to its kset's list */
164 static void kobj_kset_join(struct kobject *kobj)
169 kset_get(kobj->kset);
170 spin_lock(&kobj->kset->list_lock);
171 list_add_tail(&kobj->entry, &kobj->kset->list);
172 spin_unlock(&kobj->kset->list_lock);
175 /* remove the kobject from its kset's list */
176 static void kobj_kset_leave(struct kobject *kobj)
181 spin_lock(&kobj->kset->list_lock);
182 list_del_init(&kobj->entry);
183 spin_unlock(&kobj->kset->list_lock);
184 kset_put(kobj->kset);
187 static void kobject_init_internal(struct kobject *kobj)
191 kref_init(&kobj->kref);
192 INIT_LIST_HEAD(&kobj->entry);
193 kobj->state_in_sysfs = 0;
194 kobj->state_add_uevent_sent = 0;
195 kobj->state_remove_uevent_sent = 0;
196 kobj->state_initialized = 1;
200 static int kobject_add_internal(struct kobject *kobj)
203 struct kobject *parent;
208 if (!kobj->name || !kobj->name[0]) {
209 WARN(1, "kobject: (%p): attempted to be registered with empty "
214 parent = kobject_get(kobj->parent);
216 /* join kset if set, use it as parent if we do not already have one */
219 parent = kobject_get(&kobj->kset->kobj);
220 kobj_kset_join(kobj);
221 kobj->parent = parent;
224 pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n",
225 kobject_name(kobj), kobj, __func__,
226 parent ? kobject_name(parent) : "<NULL>",
227 kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>");
229 error = create_dir(kobj);
231 kobj_kset_leave(kobj);
235 /* be noisy on error issues */
236 if (error == -EEXIST)
237 WARN(1, "%s failed for %s with "
238 "-EEXIST, don't try to register things with "
239 "the same name in the same directory.\n",
240 __func__, kobject_name(kobj));
242 WARN(1, "%s failed for %s (error: %d parent: %s)\n",
243 __func__, kobject_name(kobj), error,
244 parent ? kobject_name(parent) : "'none'");
246 kobj->state_in_sysfs = 1;
252 * kobject_set_name_vargs - Set the name of an kobject
253 * @kobj: struct kobject to set the name of
254 * @fmt: format string used to build the name
255 * @vargs: vargs to format the string.
257 int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
262 if (kobj->name && !fmt)
265 s = kvasprintf(GFP_KERNEL, fmt, vargs);
269 /* ewww... some of these buggers have '/' in the name ... */
270 strreplace(s, '/', '!');
278 * kobject_set_name - Set the name of a kobject
279 * @kobj: struct kobject to set the name of
280 * @fmt: format string used to build the name
282 * This sets the name of the kobject. If you have already added the
283 * kobject to the system, you must call kobject_rename() in order to
284 * change the name of the kobject.
286 int kobject_set_name(struct kobject *kobj, const char *fmt, ...)
291 va_start(vargs, fmt);
292 retval = kobject_set_name_vargs(kobj, fmt, vargs);
297 EXPORT_SYMBOL(kobject_set_name);
300 * kobject_init - initialize a kobject structure
301 * @kobj: pointer to the kobject to initialize
302 * @ktype: pointer to the ktype for this kobject.
304 * This function will properly initialize a kobject such that it can then
305 * be passed to the kobject_add() call.
307 * After this function is called, the kobject MUST be cleaned up by a call
308 * to kobject_put(), not by a call to kfree directly to ensure that all of
309 * the memory is cleaned up properly.
311 void kobject_init(struct kobject *kobj, struct kobj_type *ktype)
316 err_str = "invalid kobject pointer!";
320 err_str = "must have a ktype to be initialized properly!\n";
323 if (kobj->state_initialized) {
324 /* do not error out as sometimes we can recover */
325 printk(KERN_ERR "kobject (%p): tried to init an initialized "
326 "object, something is seriously wrong.\n", kobj);
330 kobject_init_internal(kobj);
335 printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str);
338 EXPORT_SYMBOL(kobject_init);
340 static int kobject_add_varg(struct kobject *kobj, struct kobject *parent,
341 const char *fmt, va_list vargs)
345 retval = kobject_set_name_vargs(kobj, fmt, vargs);
347 printk(KERN_ERR "kobject: can not set name properly!\n");
350 kobj->parent = parent;
351 return kobject_add_internal(kobj);
355 * kobject_add - the main kobject add function
356 * @kobj: the kobject to add
357 * @parent: pointer to the parent of the kobject.
358 * @fmt: format to name the kobject with.
360 * The kobject name is set and added to the kobject hierarchy in this
363 * If @parent is set, then the parent of the @kobj will be set to it.
364 * If @parent is NULL, then the parent of the @kobj will be set to the
365 * kobject associated with the kset assigned to this kobject. If no kset
366 * is assigned to the kobject, then the kobject will be located in the
367 * root of the sysfs tree.
369 * If this function returns an error, kobject_put() must be called to
370 * properly clean up the memory associated with the object.
371 * Under no instance should the kobject that is passed to this function
372 * be directly freed with a call to kfree(), that can leak memory.
374 * Note, no "add" uevent will be created with this call, the caller should set
375 * up all of the necessary sysfs files for the object and then call
376 * kobject_uevent() with the UEVENT_ADD parameter to ensure that
377 * userspace is properly notified of this kobject's creation.
379 int kobject_add(struct kobject *kobj, struct kobject *parent,
380 const char *fmt, ...)
388 if (!kobj->state_initialized) {
389 printk(KERN_ERR "kobject '%s' (%p): tried to add an "
390 "uninitialized object, something is seriously wrong.\n",
391 kobject_name(kobj), kobj);
396 retval = kobject_add_varg(kobj, parent, fmt, args);
401 EXPORT_SYMBOL(kobject_add);
404 * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy
405 * @kobj: pointer to the kobject to initialize
406 * @ktype: pointer to the ktype for this kobject.
407 * @parent: pointer to the parent of this kobject.
408 * @fmt: the name of the kobject.
410 * This function combines the call to kobject_init() and
411 * kobject_add(). The same type of error handling after a call to
412 * kobject_add() and kobject lifetime rules are the same here.
414 int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
415 struct kobject *parent, const char *fmt, ...)
420 kobject_init(kobj, ktype);
423 retval = kobject_add_varg(kobj, parent, fmt, args);
428 EXPORT_SYMBOL_GPL(kobject_init_and_add);
431 * kobject_rename - change the name of an object
432 * @kobj: object in question.
433 * @new_name: object's new name
435 * It is the responsibility of the caller to provide mutual
436 * exclusion between two different calls of kobject_rename
437 * on the same kobject and to ensure that new_name is valid and
438 * won't conflict with other kobjects.
440 int kobject_rename(struct kobject *kobj, const char *new_name)
443 const char *devpath = NULL;
444 const char *dup_name = NULL, *name;
445 char *devpath_string = NULL;
448 kobj = kobject_get(kobj);
454 devpath = kobject_get_path(kobj, GFP_KERNEL);
459 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
460 if (!devpath_string) {
464 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
465 envp[0] = devpath_string;
468 name = dup_name = kstrdup(new_name, GFP_KERNEL);
474 error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj));
478 /* Install the new kobject name */
479 dup_name = kobj->name;
482 /* This function is mostly/only used for network interface.
483 * Some hotplug package track interfaces by their name and
484 * therefore want to know when the name is changed by the user. */
485 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
489 kfree(devpath_string);
495 EXPORT_SYMBOL_GPL(kobject_rename);
498 * kobject_move - move object to another parent
499 * @kobj: object in question.
500 * @new_parent: object's new parent (can be NULL)
502 int kobject_move(struct kobject *kobj, struct kobject *new_parent)
505 struct kobject *old_parent;
506 const char *devpath = NULL;
507 char *devpath_string = NULL;
510 kobj = kobject_get(kobj);
513 new_parent = kobject_get(new_parent);
516 new_parent = kobject_get(&kobj->kset->kobj);
519 /* old object path */
520 devpath = kobject_get_path(kobj, GFP_KERNEL);
525 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
526 if (!devpath_string) {
530 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
531 envp[0] = devpath_string;
533 error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj));
536 old_parent = kobj->parent;
537 kobj->parent = new_parent;
539 kobject_put(old_parent);
540 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
542 kobject_put(new_parent);
544 kfree(devpath_string);
548 EXPORT_SYMBOL_GPL(kobject_move);
551 * kobject_del - unlink kobject from hierarchy.
554 void kobject_del(struct kobject *kobj)
556 struct kernfs_node *sd;
562 sysfs_remove_dir(kobj);
565 kobj->state_in_sysfs = 0;
566 kobj_kset_leave(kobj);
567 kobject_put(kobj->parent);
572 * kobject_get - increment refcount for object.
575 struct kobject *kobject_get(struct kobject *kobj)
578 if (!kobj->state_initialized)
579 WARN(1, KERN_WARNING "kobject: '%s' (%p): is not "
580 "initialized, yet kobject_get() is being "
581 "called.\n", kobject_name(kobj), kobj);
582 kref_get(&kobj->kref);
587 static struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj)
589 if (!kref_get_unless_zero(&kobj->kref))
595 * kobject_cleanup - free kobject resources.
596 * @kobj: object to cleanup
598 static void kobject_cleanup(struct kobject *kobj)
600 struct kobj_type *t = get_ktype(kobj);
601 const char *name = kobj->name;
603 pr_debug("kobject: '%s' (%p): %s, parent %p\n",
604 kobject_name(kobj), kobj, __func__, kobj->parent);
606 if (t && !t->release)
607 pr_debug("kobject: '%s' (%p): does not have a release() "
608 "function, it is broken and must be fixed.\n",
609 kobject_name(kobj), kobj);
611 /* send "remove" if the caller did not do it but sent "add" */
612 if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) {
613 pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n",
614 kobject_name(kobj), kobj);
615 kobject_uevent(kobj, KOBJ_REMOVE);
618 /* remove from sysfs if the caller did not do it */
619 if (kobj->state_in_sysfs) {
620 pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n",
621 kobject_name(kobj), kobj);
625 if (t && t->release) {
626 pr_debug("kobject: '%s' (%p): calling ktype release\n",
627 kobject_name(kobj), kobj);
631 /* free name if we allocated it */
633 pr_debug("kobject: '%s': free name\n", name);
638 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
639 static void kobject_delayed_cleanup(struct work_struct *work)
641 kobject_cleanup(container_of(to_delayed_work(work),
642 struct kobject, release));
646 static void kobject_release(struct kref *kref)
648 struct kobject *kobj = container_of(kref, struct kobject, kref);
649 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
650 unsigned long delay = HZ + HZ * (get_random_int() & 0x3);
651 pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n",
652 kobject_name(kobj), kobj, __func__, kobj->parent, delay);
653 INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup);
655 schedule_delayed_work(&kobj->release, delay);
657 kobject_cleanup(kobj);
662 * kobject_put - decrement refcount for object.
665 * Decrement the refcount, and if 0, call kobject_cleanup().
667 void kobject_put(struct kobject *kobj)
670 if (!kobj->state_initialized)
671 WARN(1, KERN_WARNING "kobject: '%s' (%p): is not "
672 "initialized, yet kobject_put() is being "
673 "called.\n", kobject_name(kobj), kobj);
674 kref_put(&kobj->kref, kobject_release);
678 static void dynamic_kobj_release(struct kobject *kobj)
680 pr_debug("kobject: (%p): %s\n", kobj, __func__);
684 static struct kobj_type dynamic_kobj_ktype = {
685 .release = dynamic_kobj_release,
686 .sysfs_ops = &kobj_sysfs_ops,
690 * kobject_create - create a struct kobject dynamically
692 * This function creates a kobject structure dynamically and sets it up
693 * to be a "dynamic" kobject with a default release function set up.
695 * If the kobject was not able to be created, NULL will be returned.
696 * The kobject structure returned from here must be cleaned up with a
697 * call to kobject_put() and not kfree(), as kobject_init() has
698 * already been called on this structure.
700 struct kobject *kobject_create(void)
702 struct kobject *kobj;
704 kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
708 kobject_init(kobj, &dynamic_kobj_ktype);
713 * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs
715 * @name: the name for the kobject
716 * @parent: the parent kobject of this kobject, if any.
718 * This function creates a kobject structure dynamically and registers it
719 * with sysfs. When you are finished with this structure, call
720 * kobject_put() and the structure will be dynamically freed when
721 * it is no longer being used.
723 * If the kobject was not able to be created, NULL will be returned.
725 struct kobject *kobject_create_and_add(const char *name, struct kobject *parent)
727 struct kobject *kobj;
730 kobj = kobject_create();
734 retval = kobject_add(kobj, parent, "%s", name);
736 printk(KERN_WARNING "%s: kobject_add error: %d\n",
743 EXPORT_SYMBOL_GPL(kobject_create_and_add);
746 * kset_init - initialize a kset for use
749 void kset_init(struct kset *k)
751 kobject_init_internal(&k->kobj);
752 INIT_LIST_HEAD(&k->list);
753 spin_lock_init(&k->list_lock);
756 /* default kobject attribute operations */
757 static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr,
760 struct kobj_attribute *kattr;
763 kattr = container_of(attr, struct kobj_attribute, attr);
765 ret = kattr->show(kobj, kattr, buf);
769 static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr,
770 const char *buf, size_t count)
772 struct kobj_attribute *kattr;
775 kattr = container_of(attr, struct kobj_attribute, attr);
777 ret = kattr->store(kobj, kattr, buf, count);
781 const struct sysfs_ops kobj_sysfs_ops = {
782 .show = kobj_attr_show,
783 .store = kobj_attr_store,
785 EXPORT_SYMBOL_GPL(kobj_sysfs_ops);
788 * kset_register - initialize and add a kset.
791 int kset_register(struct kset *k)
799 err = kobject_add_internal(&k->kobj);
802 kobject_uevent(&k->kobj, KOBJ_ADD);
807 * kset_unregister - remove a kset.
810 void kset_unregister(struct kset *k)
814 kobject_del(&k->kobj);
815 kobject_put(&k->kobj);
819 * kset_find_obj - search for object in kset.
820 * @kset: kset we're looking in.
821 * @name: object's name.
823 * Lock kset via @kset->subsys, and iterate over @kset->list,
824 * looking for a matching kobject. If matching object is found
825 * take a reference and return the object.
827 struct kobject *kset_find_obj(struct kset *kset, const char *name)
830 struct kobject *ret = NULL;
832 spin_lock(&kset->list_lock);
834 list_for_each_entry(k, &kset->list, entry) {
835 if (kobject_name(k) && !strcmp(kobject_name(k), name)) {
836 ret = kobject_get_unless_zero(k);
841 spin_unlock(&kset->list_lock);
845 static void kset_release(struct kobject *kobj)
847 struct kset *kset = container_of(kobj, struct kset, kobj);
848 pr_debug("kobject: '%s' (%p): %s\n",
849 kobject_name(kobj), kobj, __func__);
853 static struct kobj_type kset_ktype = {
854 .sysfs_ops = &kobj_sysfs_ops,
855 .release = kset_release,
859 * kset_create - create a struct kset dynamically
861 * @name: the name for the kset
862 * @uevent_ops: a struct kset_uevent_ops for the kset
863 * @parent_kobj: the parent kobject of this kset, if any.
865 * This function creates a kset structure dynamically. This structure can
866 * then be registered with the system and show up in sysfs with a call to
867 * kset_register(). When you are finished with this structure, if
868 * kset_register() has been called, call kset_unregister() and the
869 * structure will be dynamically freed when it is no longer being used.
871 * If the kset was not able to be created, NULL will be returned.
873 static struct kset *kset_create(const char *name,
874 const struct kset_uevent_ops *uevent_ops,
875 struct kobject *parent_kobj)
880 kset = kzalloc(sizeof(*kset), GFP_KERNEL);
883 retval = kobject_set_name(&kset->kobj, "%s", name);
888 kset->uevent_ops = uevent_ops;
889 kset->kobj.parent = parent_kobj;
892 * The kobject of this kset will have a type of kset_ktype and belong to
893 * no kset itself. That way we can properly free it when it is
894 * finished being used.
896 kset->kobj.ktype = &kset_ktype;
897 kset->kobj.kset = NULL;
903 * kset_create_and_add - create a struct kset dynamically and add it to sysfs
905 * @name: the name for the kset
906 * @uevent_ops: a struct kset_uevent_ops for the kset
907 * @parent_kobj: the parent kobject of this kset, if any.
909 * This function creates a kset structure dynamically and registers it
910 * with sysfs. When you are finished with this structure, call
911 * kset_unregister() and the structure will be dynamically freed when it
912 * is no longer being used.
914 * If the kset was not able to be created, NULL will be returned.
916 struct kset *kset_create_and_add(const char *name,
917 const struct kset_uevent_ops *uevent_ops,
918 struct kobject *parent_kobj)
923 kset = kset_create(name, uevent_ops, parent_kobj);
926 error = kset_register(kset);
933 EXPORT_SYMBOL_GPL(kset_create_and_add);
936 static DEFINE_SPINLOCK(kobj_ns_type_lock);
937 static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES];
939 int kobj_ns_type_register(const struct kobj_ns_type_operations *ops)
941 enum kobj_ns_type type = ops->type;
944 spin_lock(&kobj_ns_type_lock);
947 if (type >= KOBJ_NS_TYPES)
951 if (type <= KOBJ_NS_TYPE_NONE)
955 if (kobj_ns_ops_tbl[type])
959 kobj_ns_ops_tbl[type] = ops;
962 spin_unlock(&kobj_ns_type_lock);
966 int kobj_ns_type_registered(enum kobj_ns_type type)
970 spin_lock(&kobj_ns_type_lock);
971 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES))
972 registered = kobj_ns_ops_tbl[type] != NULL;
973 spin_unlock(&kobj_ns_type_lock);
978 const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent)
980 const struct kobj_ns_type_operations *ops = NULL;
982 if (parent && parent->ktype && parent->ktype->child_ns_type)
983 ops = parent->ktype->child_ns_type(parent);
988 const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj)
990 return kobj_child_ns_ops(kobj->parent);
993 bool kobj_ns_current_may_mount(enum kobj_ns_type type)
995 bool may_mount = true;
997 spin_lock(&kobj_ns_type_lock);
998 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
999 kobj_ns_ops_tbl[type])
1000 may_mount = kobj_ns_ops_tbl[type]->current_may_mount();
1001 spin_unlock(&kobj_ns_type_lock);
1006 void *kobj_ns_grab_current(enum kobj_ns_type type)
1010 spin_lock(&kobj_ns_type_lock);
1011 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1012 kobj_ns_ops_tbl[type])
1013 ns = kobj_ns_ops_tbl[type]->grab_current_ns();
1014 spin_unlock(&kobj_ns_type_lock);
1019 const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk)
1021 const void *ns = NULL;
1023 spin_lock(&kobj_ns_type_lock);
1024 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1025 kobj_ns_ops_tbl[type])
1026 ns = kobj_ns_ops_tbl[type]->netlink_ns(sk);
1027 spin_unlock(&kobj_ns_type_lock);
1032 const void *kobj_ns_initial(enum kobj_ns_type type)
1034 const void *ns = NULL;
1036 spin_lock(&kobj_ns_type_lock);
1037 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1038 kobj_ns_ops_tbl[type])
1039 ns = kobj_ns_ops_tbl[type]->initial_ns();
1040 spin_unlock(&kobj_ns_type_lock);
1045 void kobj_ns_drop(enum kobj_ns_type type, void *ns)
1047 spin_lock(&kobj_ns_type_lock);
1048 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1049 kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns)
1050 kobj_ns_ops_tbl[type]->drop_ns(ns);
1051 spin_unlock(&kobj_ns_type_lock);
1054 EXPORT_SYMBOL(kobject_get);
1055 EXPORT_SYMBOL(kobject_put);
1056 EXPORT_SYMBOL(kobject_del);
1058 EXPORT_SYMBOL(kset_register);
1059 EXPORT_SYMBOL(kset_unregister);