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,
260 const char *old_name = kobj->name;
263 if (kobj->name && !fmt)
266 kobj->name = kvasprintf(GFP_KERNEL, fmt, vargs);
268 kobj->name = old_name;
272 /* ewww... some of these buggers have '/' in the name ... */
273 while ((s = strchr(kobj->name, '/')))
281 * kobject_set_name - Set the name of a kobject
282 * @kobj: struct kobject to set the name of
283 * @fmt: format string used to build the name
285 * This sets the name of the kobject. If you have already added the
286 * kobject to the system, you must call kobject_rename() in order to
287 * change the name of the kobject.
289 int kobject_set_name(struct kobject *kobj, const char *fmt, ...)
294 va_start(vargs, fmt);
295 retval = kobject_set_name_vargs(kobj, fmt, vargs);
300 EXPORT_SYMBOL(kobject_set_name);
303 * kobject_init - initialize a kobject structure
304 * @kobj: pointer to the kobject to initialize
305 * @ktype: pointer to the ktype for this kobject.
307 * This function will properly initialize a kobject such that it can then
308 * be passed to the kobject_add() call.
310 * After this function is called, the kobject MUST be cleaned up by a call
311 * to kobject_put(), not by a call to kfree directly to ensure that all of
312 * the memory is cleaned up properly.
314 void kobject_init(struct kobject *kobj, struct kobj_type *ktype)
319 err_str = "invalid kobject pointer!";
323 err_str = "must have a ktype to be initialized properly!\n";
326 if (kobj->state_initialized) {
327 /* do not error out as sometimes we can recover */
328 printk(KERN_ERR "kobject (%p): tried to init an initialized "
329 "object, something is seriously wrong.\n", kobj);
333 kobject_init_internal(kobj);
338 printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str);
341 EXPORT_SYMBOL(kobject_init);
343 static int kobject_add_varg(struct kobject *kobj, struct kobject *parent,
344 const char *fmt, va_list vargs)
348 retval = kobject_set_name_vargs(kobj, fmt, vargs);
350 printk(KERN_ERR "kobject: can not set name properly!\n");
353 kobj->parent = parent;
354 return kobject_add_internal(kobj);
358 * kobject_add - the main kobject add function
359 * @kobj: the kobject to add
360 * @parent: pointer to the parent of the kobject.
361 * @fmt: format to name the kobject with.
363 * The kobject name is set and added to the kobject hierarchy in this
366 * If @parent is set, then the parent of the @kobj will be set to it.
367 * If @parent is NULL, then the parent of the @kobj will be set to the
368 * kobject associated with the kset assigned to this kobject. If no kset
369 * is assigned to the kobject, then the kobject will be located in the
370 * root of the sysfs tree.
372 * If this function returns an error, kobject_put() must be called to
373 * properly clean up the memory associated with the object.
374 * Under no instance should the kobject that is passed to this function
375 * be directly freed with a call to kfree(), that can leak memory.
377 * Note, no "add" uevent will be created with this call, the caller should set
378 * up all of the necessary sysfs files for the object and then call
379 * kobject_uevent() with the UEVENT_ADD parameter to ensure that
380 * userspace is properly notified of this kobject's creation.
382 int kobject_add(struct kobject *kobj, struct kobject *parent,
383 const char *fmt, ...)
391 if (!kobj->state_initialized) {
392 printk(KERN_ERR "kobject '%s' (%p): tried to add an "
393 "uninitialized object, something is seriously wrong.\n",
394 kobject_name(kobj), kobj);
399 retval = kobject_add_varg(kobj, parent, fmt, args);
404 EXPORT_SYMBOL(kobject_add);
407 * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy
408 * @kobj: pointer to the kobject to initialize
409 * @ktype: pointer to the ktype for this kobject.
410 * @parent: pointer to the parent of this kobject.
411 * @fmt: the name of the kobject.
413 * This function combines the call to kobject_init() and
414 * kobject_add(). The same type of error handling after a call to
415 * kobject_add() and kobject lifetime rules are the same here.
417 int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
418 struct kobject *parent, const char *fmt, ...)
423 kobject_init(kobj, ktype);
426 retval = kobject_add_varg(kobj, parent, fmt, args);
431 EXPORT_SYMBOL_GPL(kobject_init_and_add);
434 * kobject_rename - change the name of an object
435 * @kobj: object in question.
436 * @new_name: object's new name
438 * It is the responsibility of the caller to provide mutual
439 * exclusion between two different calls of kobject_rename
440 * on the same kobject and to ensure that new_name is valid and
441 * won't conflict with other kobjects.
443 int kobject_rename(struct kobject *kobj, const char *new_name)
446 const char *devpath = NULL;
447 const char *dup_name = NULL, *name;
448 char *devpath_string = NULL;
451 kobj = kobject_get(kobj);
457 devpath = kobject_get_path(kobj, GFP_KERNEL);
462 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
463 if (!devpath_string) {
467 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
468 envp[0] = devpath_string;
471 name = dup_name = kstrdup(new_name, GFP_KERNEL);
477 error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj));
481 /* Install the new kobject name */
482 dup_name = kobj->name;
485 /* This function is mostly/only used for network interface.
486 * Some hotplug package track interfaces by their name and
487 * therefore want to know when the name is changed by the user. */
488 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
492 kfree(devpath_string);
498 EXPORT_SYMBOL_GPL(kobject_rename);
501 * kobject_move - move object to another parent
502 * @kobj: object in question.
503 * @new_parent: object's new parent (can be NULL)
505 int kobject_move(struct kobject *kobj, struct kobject *new_parent)
508 struct kobject *old_parent;
509 const char *devpath = NULL;
510 char *devpath_string = NULL;
513 kobj = kobject_get(kobj);
516 new_parent = kobject_get(new_parent);
519 new_parent = kobject_get(&kobj->kset->kobj);
522 /* old object path */
523 devpath = kobject_get_path(kobj, GFP_KERNEL);
528 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
529 if (!devpath_string) {
533 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
534 envp[0] = devpath_string;
536 error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj));
539 old_parent = kobj->parent;
540 kobj->parent = new_parent;
542 kobject_put(old_parent);
543 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
545 kobject_put(new_parent);
547 kfree(devpath_string);
551 EXPORT_SYMBOL_GPL(kobject_move);
554 * kobject_del - unlink kobject from hierarchy.
557 void kobject_del(struct kobject *kobj)
559 struct kernfs_node *sd;
565 sysfs_remove_dir(kobj);
568 kobj->state_in_sysfs = 0;
569 kobj_kset_leave(kobj);
570 kobject_put(kobj->parent);
575 * kobject_get - increment refcount for object.
578 struct kobject *kobject_get(struct kobject *kobj)
581 if (!kobj->state_initialized)
582 WARN(1, KERN_WARNING "kobject: '%s' (%p): is not "
583 "initialized, yet kobject_get() is being "
584 "called.\n", kobject_name(kobj), kobj);
585 kref_get(&kobj->kref);
590 static struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj)
592 if (!kref_get_unless_zero(&kobj->kref))
598 * kobject_cleanup - free kobject resources.
599 * @kobj: object to cleanup
601 static void kobject_cleanup(struct kobject *kobj)
603 struct kobj_type *t = get_ktype(kobj);
604 const char *name = kobj->name;
606 pr_debug("kobject: '%s' (%p): %s, parent %p\n",
607 kobject_name(kobj), kobj, __func__, kobj->parent);
609 if (t && !t->release)
610 pr_debug("kobject: '%s' (%p): does not have a release() "
611 "function, it is broken and must be fixed.\n",
612 kobject_name(kobj), kobj);
614 /* send "remove" if the caller did not do it but sent "add" */
615 if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) {
616 pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n",
617 kobject_name(kobj), kobj);
618 kobject_uevent(kobj, KOBJ_REMOVE);
621 /* remove from sysfs if the caller did not do it */
622 if (kobj->state_in_sysfs) {
623 pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n",
624 kobject_name(kobj), kobj);
628 if (t && t->release) {
629 pr_debug("kobject: '%s' (%p): calling ktype release\n",
630 kobject_name(kobj), kobj);
634 /* free name if we allocated it */
636 pr_debug("kobject: '%s': free name\n", name);
641 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
642 static void kobject_delayed_cleanup(struct work_struct *work)
644 kobject_cleanup(container_of(to_delayed_work(work),
645 struct kobject, release));
649 static void kobject_release(struct kref *kref)
651 struct kobject *kobj = container_of(kref, struct kobject, kref);
652 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
653 unsigned long delay = HZ + HZ * (get_random_int() & 0x3);
654 pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n",
655 kobject_name(kobj), kobj, __func__, kobj->parent, delay);
656 INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup);
658 schedule_delayed_work(&kobj->release, delay);
660 kobject_cleanup(kobj);
665 * kobject_put - decrement refcount for object.
668 * Decrement the refcount, and if 0, call kobject_cleanup().
670 void kobject_put(struct kobject *kobj)
673 if (!kobj->state_initialized)
674 WARN(1, KERN_WARNING "kobject: '%s' (%p): is not "
675 "initialized, yet kobject_put() is being "
676 "called.\n", kobject_name(kobj), kobj);
677 kref_put(&kobj->kref, kobject_release);
681 static void dynamic_kobj_release(struct kobject *kobj)
683 pr_debug("kobject: (%p): %s\n", kobj, __func__);
687 static struct kobj_type dynamic_kobj_ktype = {
688 .release = dynamic_kobj_release,
689 .sysfs_ops = &kobj_sysfs_ops,
693 * kobject_create - create a struct kobject dynamically
695 * This function creates a kobject structure dynamically and sets it up
696 * to be a "dynamic" kobject with a default release function set up.
698 * If the kobject was not able to be created, NULL will be returned.
699 * The kobject structure returned from here must be cleaned up with a
700 * call to kobject_put() and not kfree(), as kobject_init() has
701 * already been called on this structure.
703 struct kobject *kobject_create(void)
705 struct kobject *kobj;
707 kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
711 kobject_init(kobj, &dynamic_kobj_ktype);
716 * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs
718 * @name: the name for the kobject
719 * @parent: the parent kobject of this kobject, if any.
721 * This function creates a kobject structure dynamically and registers it
722 * with sysfs. When you are finished with this structure, call
723 * kobject_put() and the structure will be dynamically freed when
724 * it is no longer being used.
726 * If the kobject was not able to be created, NULL will be returned.
728 struct kobject *kobject_create_and_add(const char *name, struct kobject *parent)
730 struct kobject *kobj;
733 kobj = kobject_create();
737 retval = kobject_add(kobj, parent, "%s", name);
739 printk(KERN_WARNING "%s: kobject_add error: %d\n",
746 EXPORT_SYMBOL_GPL(kobject_create_and_add);
749 * kset_init - initialize a kset for use
752 void kset_init(struct kset *k)
754 kobject_init_internal(&k->kobj);
755 INIT_LIST_HEAD(&k->list);
756 spin_lock_init(&k->list_lock);
759 /* default kobject attribute operations */
760 static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr,
763 struct kobj_attribute *kattr;
766 kattr = container_of(attr, struct kobj_attribute, attr);
768 ret = kattr->show(kobj, kattr, buf);
772 static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr,
773 const char *buf, size_t count)
775 struct kobj_attribute *kattr;
778 kattr = container_of(attr, struct kobj_attribute, attr);
780 ret = kattr->store(kobj, kattr, buf, count);
784 const struct sysfs_ops kobj_sysfs_ops = {
785 .show = kobj_attr_show,
786 .store = kobj_attr_store,
788 EXPORT_SYMBOL_GPL(kobj_sysfs_ops);
791 * kset_register - initialize and add a kset.
794 int kset_register(struct kset *k)
802 err = kobject_add_internal(&k->kobj);
805 kobject_uevent(&k->kobj, KOBJ_ADD);
810 * kset_unregister - remove a kset.
813 void kset_unregister(struct kset *k)
817 kobject_del(&k->kobj);
818 kobject_put(&k->kobj);
822 * kset_find_obj - search for object in kset.
823 * @kset: kset we're looking in.
824 * @name: object's name.
826 * Lock kset via @kset->subsys, and iterate over @kset->list,
827 * looking for a matching kobject. If matching object is found
828 * take a reference and return the object.
830 struct kobject *kset_find_obj(struct kset *kset, const char *name)
833 struct kobject *ret = NULL;
835 spin_lock(&kset->list_lock);
837 list_for_each_entry(k, &kset->list, entry) {
838 if (kobject_name(k) && !strcmp(kobject_name(k), name)) {
839 ret = kobject_get_unless_zero(k);
844 spin_unlock(&kset->list_lock);
848 static void kset_release(struct kobject *kobj)
850 struct kset *kset = container_of(kobj, struct kset, kobj);
851 pr_debug("kobject: '%s' (%p): %s\n",
852 kobject_name(kobj), kobj, __func__);
856 static struct kobj_type kset_ktype = {
857 .sysfs_ops = &kobj_sysfs_ops,
858 .release = kset_release,
862 * kset_create - create a struct kset dynamically
864 * @name: the name for the kset
865 * @uevent_ops: a struct kset_uevent_ops for the kset
866 * @parent_kobj: the parent kobject of this kset, if any.
868 * This function creates a kset structure dynamically. This structure can
869 * then be registered with the system and show up in sysfs with a call to
870 * kset_register(). When you are finished with this structure, if
871 * kset_register() has been called, call kset_unregister() and the
872 * structure will be dynamically freed when it is no longer being used.
874 * If the kset was not able to be created, NULL will be returned.
876 static struct kset *kset_create(const char *name,
877 const struct kset_uevent_ops *uevent_ops,
878 struct kobject *parent_kobj)
883 kset = kzalloc(sizeof(*kset), GFP_KERNEL);
886 retval = kobject_set_name(&kset->kobj, "%s", name);
891 kset->uevent_ops = uevent_ops;
892 kset->kobj.parent = parent_kobj;
895 * The kobject of this kset will have a type of kset_ktype and belong to
896 * no kset itself. That way we can properly free it when it is
897 * finished being used.
899 kset->kobj.ktype = &kset_ktype;
900 kset->kobj.kset = NULL;
906 * kset_create_and_add - create a struct kset dynamically and add it to sysfs
908 * @name: the name for the kset
909 * @uevent_ops: a struct kset_uevent_ops for the kset
910 * @parent_kobj: the parent kobject of this kset, if any.
912 * This function creates a kset structure dynamically and registers it
913 * with sysfs. When you are finished with this structure, call
914 * kset_unregister() and the structure will be dynamically freed when it
915 * is no longer being used.
917 * If the kset was not able to be created, NULL will be returned.
919 struct kset *kset_create_and_add(const char *name,
920 const struct kset_uevent_ops *uevent_ops,
921 struct kobject *parent_kobj)
926 kset = kset_create(name, uevent_ops, parent_kobj);
929 error = kset_register(kset);
936 EXPORT_SYMBOL_GPL(kset_create_and_add);
939 static DEFINE_SPINLOCK(kobj_ns_type_lock);
940 static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES];
942 int kobj_ns_type_register(const struct kobj_ns_type_operations *ops)
944 enum kobj_ns_type type = ops->type;
947 spin_lock(&kobj_ns_type_lock);
950 if (type >= KOBJ_NS_TYPES)
954 if (type <= KOBJ_NS_TYPE_NONE)
958 if (kobj_ns_ops_tbl[type])
962 kobj_ns_ops_tbl[type] = ops;
965 spin_unlock(&kobj_ns_type_lock);
969 int kobj_ns_type_registered(enum kobj_ns_type type)
973 spin_lock(&kobj_ns_type_lock);
974 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES))
975 registered = kobj_ns_ops_tbl[type] != NULL;
976 spin_unlock(&kobj_ns_type_lock);
981 const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent)
983 const struct kobj_ns_type_operations *ops = NULL;
985 if (parent && parent->ktype && parent->ktype->child_ns_type)
986 ops = parent->ktype->child_ns_type(parent);
991 const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj)
993 return kobj_child_ns_ops(kobj->parent);
996 bool kobj_ns_current_may_mount(enum kobj_ns_type type)
998 bool may_mount = true;
1000 spin_lock(&kobj_ns_type_lock);
1001 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1002 kobj_ns_ops_tbl[type])
1003 may_mount = kobj_ns_ops_tbl[type]->current_may_mount();
1004 spin_unlock(&kobj_ns_type_lock);
1009 void *kobj_ns_grab_current(enum kobj_ns_type type)
1013 spin_lock(&kobj_ns_type_lock);
1014 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1015 kobj_ns_ops_tbl[type])
1016 ns = kobj_ns_ops_tbl[type]->grab_current_ns();
1017 spin_unlock(&kobj_ns_type_lock);
1022 const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk)
1024 const void *ns = NULL;
1026 spin_lock(&kobj_ns_type_lock);
1027 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1028 kobj_ns_ops_tbl[type])
1029 ns = kobj_ns_ops_tbl[type]->netlink_ns(sk);
1030 spin_unlock(&kobj_ns_type_lock);
1035 const void *kobj_ns_initial(enum kobj_ns_type type)
1037 const void *ns = NULL;
1039 spin_lock(&kobj_ns_type_lock);
1040 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1041 kobj_ns_ops_tbl[type])
1042 ns = kobj_ns_ops_tbl[type]->initial_ns();
1043 spin_unlock(&kobj_ns_type_lock);
1048 void kobj_ns_drop(enum kobj_ns_type type, void *ns)
1050 spin_lock(&kobj_ns_type_lock);
1051 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1052 kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns)
1053 kobj_ns_ops_tbl[type]->drop_ns(ns);
1054 spin_unlock(&kobj_ns_type_lock);
1057 EXPORT_SYMBOL(kobject_get);
1058 EXPORT_SYMBOL(kobject_put);
1059 EXPORT_SYMBOL(kobject_del);
1061 EXPORT_SYMBOL(kset_register);
1062 EXPORT_SYMBOL(kset_unregister);