1 // SPDX-License-Identifier: GPL-2.0
3 * kobject.c - library routines for handling generic kernel objects
5 * Copyright (c) 2002-2003 Patrick Mochel <mochel@osdl.org>
6 * Copyright (c) 2006-2007 Greg Kroah-Hartman <greg@kroah.com>
7 * Copyright (c) 2006-2007 Novell Inc.
9 * Please see the file Documentation/core-api/kobject.rst for critical information
10 * about using the kobject interface.
13 #include <linux/kobject.h>
14 #include <linux/string.h>
15 #include <linux/export.h>
16 #include <linux/stat.h>
17 #include <linux/slab.h>
18 #include <linux/random.h>
21 * kobject_namespace() - Return @kobj's namespace tag.
22 * @kobj: kobject in question
24 * Returns namespace tag of @kobj if its parent has namespace ops enabled
25 * and thus @kobj should have a namespace tag associated with it. Returns
28 const void *kobject_namespace(struct kobject *kobj)
30 const struct kobj_ns_type_operations *ns_ops = kobj_ns_ops(kobj);
32 if (!ns_ops || ns_ops->type == KOBJ_NS_TYPE_NONE)
35 return kobj->ktype->namespace(kobj);
39 * kobject_get_ownership() - Get sysfs ownership data for @kobj.
40 * @kobj: kobject in question
41 * @uid: kernel user ID for sysfs objects
42 * @gid: kernel group ID for sysfs objects
44 * Returns initial uid/gid pair that should be used when creating sysfs
45 * representation of given kobject. Normally used to adjust ownership of
46 * objects in a container.
48 void kobject_get_ownership(struct kobject *kobj, kuid_t *uid, kgid_t *gid)
50 *uid = GLOBAL_ROOT_UID;
51 *gid = GLOBAL_ROOT_GID;
53 if (kobj->ktype->get_ownership)
54 kobj->ktype->get_ownership(kobj, uid, gid);
58 * populate_dir - populate directory with attributes.
59 * @kobj: object we're working on.
61 * Most subsystems have a set of default attributes that are associated
62 * with an object that registers with them. This is a helper called during
63 * object registration that loops through the default attributes of the
64 * subsystem and creates attributes files for them in sysfs.
66 static int populate_dir(struct kobject *kobj)
68 struct kobj_type *t = get_ktype(kobj);
69 struct attribute *attr;
73 if (t && t->default_attrs) {
74 for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) {
75 error = sysfs_create_file(kobj, attr);
83 static int create_dir(struct kobject *kobj)
85 const struct kobj_type *ktype = get_ktype(kobj);
86 const struct kobj_ns_type_operations *ops;
89 error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj));
93 error = populate_dir(kobj);
95 sysfs_remove_dir(kobj);
100 error = sysfs_create_groups(kobj, ktype->default_groups);
102 sysfs_remove_dir(kobj);
108 * @kobj->sd may be deleted by an ancestor going away. Hold an
109 * extra reference so that it stays until @kobj is gone.
114 * If @kobj has ns_ops, its children need to be filtered based on
115 * their namespace tags. Enable namespace support on @kobj->sd.
117 ops = kobj_child_ns_ops(kobj);
119 BUG_ON(ops->type <= KOBJ_NS_TYPE_NONE);
120 BUG_ON(ops->type >= KOBJ_NS_TYPES);
121 BUG_ON(!kobj_ns_type_registered(ops->type));
123 sysfs_enable_ns(kobj->sd);
129 static int get_kobj_path_length(struct kobject *kobj)
132 struct kobject *parent = kobj;
134 /* walk up the ancestors until we hit the one pointing to the
136 * Add 1 to strlen for leading '/' of each level.
139 if (kobject_name(parent) == NULL)
141 length += strlen(kobject_name(parent)) + 1;
142 parent = parent->parent;
147 static void fill_kobj_path(struct kobject *kobj, char *path, int length)
149 struct kobject *parent;
152 for (parent = kobj; parent; parent = parent->parent) {
153 int cur = strlen(kobject_name(parent));
154 /* back up enough to print this name with '/' */
156 memcpy(path + length, kobject_name(parent), cur);
157 *(path + --length) = '/';
160 pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj),
161 kobj, __func__, path);
165 * kobject_get_path() - Allocate memory and fill in the path for @kobj.
166 * @kobj: kobject in question, with which to build the path
167 * @gfp_mask: the allocation type used to allocate the path
169 * Return: The newly allocated memory, caller must free with kfree().
171 char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask)
176 len = get_kobj_path_length(kobj);
179 path = kzalloc(len, gfp_mask);
182 fill_kobj_path(kobj, path, len);
186 EXPORT_SYMBOL_GPL(kobject_get_path);
188 /* add the kobject to its kset's list */
189 static void kobj_kset_join(struct kobject *kobj)
194 kset_get(kobj->kset);
195 spin_lock(&kobj->kset->list_lock);
196 list_add_tail(&kobj->entry, &kobj->kset->list);
197 spin_unlock(&kobj->kset->list_lock);
200 /* remove the kobject from its kset's list */
201 static void kobj_kset_leave(struct kobject *kobj)
206 spin_lock(&kobj->kset->list_lock);
207 list_del_init(&kobj->entry);
208 spin_unlock(&kobj->kset->list_lock);
209 kset_put(kobj->kset);
212 static void kobject_init_internal(struct kobject *kobj)
216 kref_init(&kobj->kref);
217 INIT_LIST_HEAD(&kobj->entry);
218 kobj->state_in_sysfs = 0;
219 kobj->state_add_uevent_sent = 0;
220 kobj->state_remove_uevent_sent = 0;
221 kobj->state_initialized = 1;
225 static int kobject_add_internal(struct kobject *kobj)
228 struct kobject *parent;
233 if (!kobj->name || !kobj->name[0]) {
235 "kobject: (%p): attempted to be registered with empty name!\n",
240 parent = kobject_get(kobj->parent);
242 /* join kset if set, use it as parent if we do not already have one */
245 parent = kobject_get(&kobj->kset->kobj);
246 kobj_kset_join(kobj);
247 kobj->parent = parent;
250 pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n",
251 kobject_name(kobj), kobj, __func__,
252 parent ? kobject_name(parent) : "<NULL>",
253 kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>");
255 error = create_dir(kobj);
257 kobj_kset_leave(kobj);
261 /* be noisy on error issues */
262 if (error == -EEXIST)
263 pr_err("%s failed for %s with -EEXIST, don't try to register things with the same name in the same directory.\n",
264 __func__, kobject_name(kobj));
266 pr_err("%s failed for %s (error: %d parent: %s)\n",
267 __func__, kobject_name(kobj), error,
268 parent ? kobject_name(parent) : "'none'");
270 kobj->state_in_sysfs = 1;
276 * kobject_set_name_vargs() - Set the name of a kobject.
277 * @kobj: struct kobject to set the name of
278 * @fmt: format string used to build the name
279 * @vargs: vargs to format the string.
281 int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
286 if (kobj->name && !fmt)
289 s = kvasprintf_const(GFP_KERNEL, fmt, vargs);
294 * ewww... some of these buggers have '/' in the name ... If
295 * that's the case, we need to make sure we have an actual
296 * allocated copy to modify, since kvasprintf_const may have
297 * returned something from .rodata.
299 if (strchr(s, '/')) {
302 t = kstrdup(s, GFP_KERNEL);
306 strreplace(t, '/', '!');
309 kfree_const(kobj->name);
316 * kobject_set_name() - Set the name of a kobject.
317 * @kobj: struct kobject to set the name of
318 * @fmt: format string used to build the name
320 * This sets the name of the kobject. If you have already added the
321 * kobject to the system, you must call kobject_rename() in order to
322 * change the name of the kobject.
324 int kobject_set_name(struct kobject *kobj, const char *fmt, ...)
329 va_start(vargs, fmt);
330 retval = kobject_set_name_vargs(kobj, fmt, vargs);
335 EXPORT_SYMBOL(kobject_set_name);
338 * kobject_init() - Initialize a kobject structure.
339 * @kobj: pointer to the kobject to initialize
340 * @ktype: pointer to the ktype for this kobject.
342 * This function will properly initialize a kobject such that it can then
343 * be passed to the kobject_add() call.
345 * After this function is called, the kobject MUST be cleaned up by a call
346 * to kobject_put(), not by a call to kfree directly to ensure that all of
347 * the memory is cleaned up properly.
349 void kobject_init(struct kobject *kobj, struct kobj_type *ktype)
354 err_str = "invalid kobject pointer!";
358 err_str = "must have a ktype to be initialized properly!\n";
361 if (kobj->state_initialized) {
362 /* do not error out as sometimes we can recover */
363 pr_err("kobject (%p): tried to init an initialized object, something is seriously wrong.\n",
368 kobject_init_internal(kobj);
373 pr_err("kobject (%p): %s\n", kobj, err_str);
376 EXPORT_SYMBOL(kobject_init);
378 static __printf(3, 0) int kobject_add_varg(struct kobject *kobj,
379 struct kobject *parent,
380 const char *fmt, va_list vargs)
384 retval = kobject_set_name_vargs(kobj, fmt, vargs);
386 pr_err("kobject: can not set name properly!\n");
389 kobj->parent = parent;
390 return kobject_add_internal(kobj);
394 * kobject_add() - The main kobject add function.
395 * @kobj: the kobject to add
396 * @parent: pointer to the parent of the kobject.
397 * @fmt: format to name the kobject with.
399 * The kobject name is set and added to the kobject hierarchy in this
402 * If @parent is set, then the parent of the @kobj will be set to it.
403 * If @parent is NULL, then the parent of the @kobj will be set to the
404 * kobject associated with the kset assigned to this kobject. If no kset
405 * is assigned to the kobject, then the kobject will be located in the
406 * root of the sysfs tree.
408 * Note, no "add" uevent will be created with this call, the caller should set
409 * up all of the necessary sysfs files for the object and then call
410 * kobject_uevent() with the UEVENT_ADD parameter to ensure that
411 * userspace is properly notified of this kobject's creation.
413 * Return: If this function returns an error, kobject_put() must be
414 * called to properly clean up the memory associated with the
415 * object. Under no instance should the kobject that is passed
416 * to this function be directly freed with a call to kfree(),
417 * that can leak memory.
419 * If this function returns success, kobject_put() must also be called
420 * in order to properly clean up the memory associated with the object.
422 * In short, once this function is called, kobject_put() MUST be called
423 * when the use of the object is finished in order to properly free
426 int kobject_add(struct kobject *kobj, struct kobject *parent,
427 const char *fmt, ...)
435 if (!kobj->state_initialized) {
436 pr_err("kobject '%s' (%p): tried to add an uninitialized object, something is seriously wrong.\n",
437 kobject_name(kobj), kobj);
442 retval = kobject_add_varg(kobj, parent, fmt, args);
447 EXPORT_SYMBOL(kobject_add);
450 * kobject_init_and_add() - Initialize a kobject structure and add it to
451 * the kobject hierarchy.
452 * @kobj: pointer to the kobject to initialize
453 * @ktype: pointer to the ktype for this kobject.
454 * @parent: pointer to the parent of this kobject.
455 * @fmt: the name of the kobject.
457 * This function combines the call to kobject_init() and kobject_add().
459 * If this function returns an error, kobject_put() must be called to
460 * properly clean up the memory associated with the object. This is the
461 * same type of error handling after a call to kobject_add() and kobject
462 * lifetime rules are the same here.
464 int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
465 struct kobject *parent, const char *fmt, ...)
470 kobject_init(kobj, ktype);
473 retval = kobject_add_varg(kobj, parent, fmt, args);
478 EXPORT_SYMBOL_GPL(kobject_init_and_add);
481 * kobject_rename() - Change the name of an object.
482 * @kobj: object in question.
483 * @new_name: object's new name
485 * It is the responsibility of the caller to provide mutual
486 * exclusion between two different calls of kobject_rename
487 * on the same kobject and to ensure that new_name is valid and
488 * won't conflict with other kobjects.
490 int kobject_rename(struct kobject *kobj, const char *new_name)
493 const char *devpath = NULL;
494 const char *dup_name = NULL, *name;
495 char *devpath_string = NULL;
498 kobj = kobject_get(kobj);
506 devpath = kobject_get_path(kobj, GFP_KERNEL);
511 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
512 if (!devpath_string) {
516 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
517 envp[0] = devpath_string;
520 name = dup_name = kstrdup_const(new_name, GFP_KERNEL);
526 error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj));
530 /* Install the new kobject name */
531 dup_name = kobj->name;
534 /* This function is mostly/only used for network interface.
535 * Some hotplug package track interfaces by their name and
536 * therefore want to know when the name is changed by the user. */
537 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
540 kfree_const(dup_name);
541 kfree(devpath_string);
547 EXPORT_SYMBOL_GPL(kobject_rename);
550 * kobject_move() - Move object to another parent.
551 * @kobj: object in question.
552 * @new_parent: object's new parent (can be NULL)
554 int kobject_move(struct kobject *kobj, struct kobject *new_parent)
557 struct kobject *old_parent;
558 const char *devpath = NULL;
559 char *devpath_string = NULL;
562 kobj = kobject_get(kobj);
565 new_parent = kobject_get(new_parent);
568 new_parent = kobject_get(&kobj->kset->kobj);
571 /* old object path */
572 devpath = kobject_get_path(kobj, GFP_KERNEL);
577 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
578 if (!devpath_string) {
582 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
583 envp[0] = devpath_string;
585 error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj));
588 old_parent = kobj->parent;
589 kobj->parent = new_parent;
591 kobject_put(old_parent);
592 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
594 kobject_put(new_parent);
596 kfree(devpath_string);
600 EXPORT_SYMBOL_GPL(kobject_move);
602 static void __kobject_del(struct kobject *kobj)
604 struct kernfs_node *sd;
605 const struct kobj_type *ktype;
608 ktype = get_ktype(kobj);
611 sysfs_remove_groups(kobj, ktype->default_groups);
613 /* send "remove" if the caller did not do it but sent "add" */
614 if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) {
615 pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n",
616 kobject_name(kobj), kobj);
617 kobject_uevent(kobj, KOBJ_REMOVE);
620 sysfs_remove_dir(kobj);
623 kobj->state_in_sysfs = 0;
624 kobj_kset_leave(kobj);
629 * kobject_del() - Unlink kobject from hierarchy.
632 * This is the function that should be called to delete an object
633 * successfully added via kobject_add().
635 void kobject_del(struct kobject *kobj)
637 struct kobject *parent;
642 parent = kobj->parent;
646 EXPORT_SYMBOL(kobject_del);
649 * kobject_get() - Increment refcount for object.
652 struct kobject *kobject_get(struct kobject *kobj)
655 if (!kobj->state_initialized)
657 "kobject: '%s' (%p): is not initialized, yet kobject_get() is being called.\n",
658 kobject_name(kobj), kobj);
659 kref_get(&kobj->kref);
663 EXPORT_SYMBOL(kobject_get);
665 struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj)
669 if (!kref_get_unless_zero(&kobj->kref))
673 EXPORT_SYMBOL(kobject_get_unless_zero);
676 * kobject_cleanup - free kobject resources.
677 * @kobj: object to cleanup
679 static void kobject_cleanup(struct kobject *kobj)
681 struct kobject *parent = kobj->parent;
682 struct kobj_type *t = get_ktype(kobj);
683 const char *name = kobj->name;
685 pr_debug("kobject: '%s' (%p): %s, parent %p\n",
686 kobject_name(kobj), kobj, __func__, kobj->parent);
688 if (t && !t->release)
689 pr_debug("kobject: '%s' (%p): does not have a release() function, it is broken and must be fixed. See Documentation/core-api/kobject.rst.\n",
690 kobject_name(kobj), kobj);
692 /* remove from sysfs if the caller did not do it */
693 if (kobj->state_in_sysfs) {
694 pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n",
695 kobject_name(kobj), kobj);
698 /* avoid dropping the parent reference unnecessarily */
702 if (t && t->release) {
703 pr_debug("kobject: '%s' (%p): calling ktype release\n",
704 kobject_name(kobj), kobj);
708 /* free name if we allocated it */
710 pr_debug("kobject: '%s': free name\n", name);
717 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
718 static void kobject_delayed_cleanup(struct work_struct *work)
720 kobject_cleanup(container_of(to_delayed_work(work),
721 struct kobject, release));
725 static void kobject_release(struct kref *kref)
727 struct kobject *kobj = container_of(kref, struct kobject, kref);
728 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
729 unsigned long delay = HZ + HZ * (get_random_int() & 0x3);
730 pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n",
731 kobject_name(kobj), kobj, __func__, kobj->parent, delay);
732 INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup);
734 schedule_delayed_work(&kobj->release, delay);
736 kobject_cleanup(kobj);
741 * kobject_put() - Decrement refcount for object.
744 * Decrement the refcount, and if 0, call kobject_cleanup().
746 void kobject_put(struct kobject *kobj)
749 if (!kobj->state_initialized)
751 "kobject: '%s' (%p): is not initialized, yet kobject_put() is being called.\n",
752 kobject_name(kobj), kobj);
753 kref_put(&kobj->kref, kobject_release);
756 EXPORT_SYMBOL(kobject_put);
758 static void dynamic_kobj_release(struct kobject *kobj)
760 pr_debug("kobject: (%p): %s\n", kobj, __func__);
764 static struct kobj_type dynamic_kobj_ktype = {
765 .release = dynamic_kobj_release,
766 .sysfs_ops = &kobj_sysfs_ops,
770 * kobject_create() - Create a struct kobject dynamically.
772 * This function creates a kobject structure dynamically and sets it up
773 * to be a "dynamic" kobject with a default release function set up.
775 * If the kobject was not able to be created, NULL will be returned.
776 * The kobject structure returned from here must be cleaned up with a
777 * call to kobject_put() and not kfree(), as kobject_init() has
778 * already been called on this structure.
780 static struct kobject *kobject_create(void)
782 struct kobject *kobj;
784 kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
788 kobject_init(kobj, &dynamic_kobj_ktype);
793 * kobject_create_and_add() - Create a struct kobject dynamically and
794 * register it with sysfs.
795 * @name: the name for the kobject
796 * @parent: the parent kobject of this kobject, if any.
798 * This function creates a kobject structure dynamically and registers it
799 * with sysfs. When you are finished with this structure, call
800 * kobject_put() and the structure will be dynamically freed when
801 * it is no longer being used.
803 * If the kobject was not able to be created, NULL will be returned.
805 struct kobject *kobject_create_and_add(const char *name, struct kobject *parent)
807 struct kobject *kobj;
810 kobj = kobject_create();
814 retval = kobject_add(kobj, parent, "%s", name);
816 pr_warn("%s: kobject_add error: %d\n", __func__, retval);
822 EXPORT_SYMBOL_GPL(kobject_create_and_add);
825 * kset_init() - Initialize a kset for use.
828 void kset_init(struct kset *k)
830 kobject_init_internal(&k->kobj);
831 INIT_LIST_HEAD(&k->list);
832 spin_lock_init(&k->list_lock);
835 /* default kobject attribute operations */
836 static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr,
839 struct kobj_attribute *kattr;
842 kattr = container_of(attr, struct kobj_attribute, attr);
844 ret = kattr->show(kobj, kattr, buf);
848 static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr,
849 const char *buf, size_t count)
851 struct kobj_attribute *kattr;
854 kattr = container_of(attr, struct kobj_attribute, attr);
856 ret = kattr->store(kobj, kattr, buf, count);
860 const struct sysfs_ops kobj_sysfs_ops = {
861 .show = kobj_attr_show,
862 .store = kobj_attr_store,
864 EXPORT_SYMBOL_GPL(kobj_sysfs_ops);
867 * kset_register() - Initialize and add a kset.
870 int kset_register(struct kset *k)
878 err = kobject_add_internal(&k->kobj);
881 kobject_uevent(&k->kobj, KOBJ_ADD);
884 EXPORT_SYMBOL(kset_register);
887 * kset_unregister() - Remove a kset.
890 void kset_unregister(struct kset *k)
894 kobject_del(&k->kobj);
895 kobject_put(&k->kobj);
897 EXPORT_SYMBOL(kset_unregister);
900 * kset_find_obj() - Search for object in kset.
901 * @kset: kset we're looking in.
902 * @name: object's name.
904 * Lock kset via @kset->subsys, and iterate over @kset->list,
905 * looking for a matching kobject. If matching object is found
906 * take a reference and return the object.
908 struct kobject *kset_find_obj(struct kset *kset, const char *name)
911 struct kobject *ret = NULL;
913 spin_lock(&kset->list_lock);
915 list_for_each_entry(k, &kset->list, entry) {
916 if (kobject_name(k) && !strcmp(kobject_name(k), name)) {
917 ret = kobject_get_unless_zero(k);
922 spin_unlock(&kset->list_lock);
925 EXPORT_SYMBOL_GPL(kset_find_obj);
927 static void kset_release(struct kobject *kobj)
929 struct kset *kset = container_of(kobj, struct kset, kobj);
930 pr_debug("kobject: '%s' (%p): %s\n",
931 kobject_name(kobj), kobj, __func__);
935 static void kset_get_ownership(struct kobject *kobj, kuid_t *uid, kgid_t *gid)
938 kobject_get_ownership(kobj->parent, uid, gid);
941 static struct kobj_type kset_ktype = {
942 .sysfs_ops = &kobj_sysfs_ops,
943 .release = kset_release,
944 .get_ownership = kset_get_ownership,
948 * kset_create() - Create a struct kset dynamically.
950 * @name: the name for the kset
951 * @uevent_ops: a struct kset_uevent_ops for the kset
952 * @parent_kobj: the parent kobject of this kset, if any.
954 * This function creates a kset structure dynamically. This structure can
955 * then be registered with the system and show up in sysfs with a call to
956 * kset_register(). When you are finished with this structure, if
957 * kset_register() has been called, call kset_unregister() and the
958 * structure will be dynamically freed when it is no longer being used.
960 * If the kset was not able to be created, NULL will be returned.
962 static struct kset *kset_create(const char *name,
963 const struct kset_uevent_ops *uevent_ops,
964 struct kobject *parent_kobj)
969 kset = kzalloc(sizeof(*kset), GFP_KERNEL);
972 retval = kobject_set_name(&kset->kobj, "%s", name);
977 kset->uevent_ops = uevent_ops;
978 kset->kobj.parent = parent_kobj;
981 * The kobject of this kset will have a type of kset_ktype and belong to
982 * no kset itself. That way we can properly free it when it is
983 * finished being used.
985 kset->kobj.ktype = &kset_ktype;
986 kset->kobj.kset = NULL;
992 * kset_create_and_add() - Create a struct kset dynamically and add it to sysfs.
994 * @name: the name for the kset
995 * @uevent_ops: a struct kset_uevent_ops for the kset
996 * @parent_kobj: the parent kobject of this kset, if any.
998 * This function creates a kset structure dynamically and registers it
999 * with sysfs. When you are finished with this structure, call
1000 * kset_unregister() and the structure will be dynamically freed when it
1001 * is no longer being used.
1003 * If the kset was not able to be created, NULL will be returned.
1005 struct kset *kset_create_and_add(const char *name,
1006 const struct kset_uevent_ops *uevent_ops,
1007 struct kobject *parent_kobj)
1012 kset = kset_create(name, uevent_ops, parent_kobj);
1015 error = kset_register(kset);
1022 EXPORT_SYMBOL_GPL(kset_create_and_add);
1025 static DEFINE_SPINLOCK(kobj_ns_type_lock);
1026 static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES];
1028 int kobj_ns_type_register(const struct kobj_ns_type_operations *ops)
1030 enum kobj_ns_type type = ops->type;
1033 spin_lock(&kobj_ns_type_lock);
1036 if (type >= KOBJ_NS_TYPES)
1040 if (type <= KOBJ_NS_TYPE_NONE)
1044 if (kobj_ns_ops_tbl[type])
1048 kobj_ns_ops_tbl[type] = ops;
1051 spin_unlock(&kobj_ns_type_lock);
1055 int kobj_ns_type_registered(enum kobj_ns_type type)
1059 spin_lock(&kobj_ns_type_lock);
1060 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES))
1061 registered = kobj_ns_ops_tbl[type] != NULL;
1062 spin_unlock(&kobj_ns_type_lock);
1067 const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent)
1069 const struct kobj_ns_type_operations *ops = NULL;
1071 if (parent && parent->ktype && parent->ktype->child_ns_type)
1072 ops = parent->ktype->child_ns_type(parent);
1077 const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj)
1079 return kobj_child_ns_ops(kobj->parent);
1082 bool kobj_ns_current_may_mount(enum kobj_ns_type type)
1084 bool may_mount = true;
1086 spin_lock(&kobj_ns_type_lock);
1087 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1088 kobj_ns_ops_tbl[type])
1089 may_mount = kobj_ns_ops_tbl[type]->current_may_mount();
1090 spin_unlock(&kobj_ns_type_lock);
1095 void *kobj_ns_grab_current(enum kobj_ns_type type)
1099 spin_lock(&kobj_ns_type_lock);
1100 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1101 kobj_ns_ops_tbl[type])
1102 ns = kobj_ns_ops_tbl[type]->grab_current_ns();
1103 spin_unlock(&kobj_ns_type_lock);
1107 EXPORT_SYMBOL_GPL(kobj_ns_grab_current);
1109 const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk)
1111 const void *ns = NULL;
1113 spin_lock(&kobj_ns_type_lock);
1114 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1115 kobj_ns_ops_tbl[type])
1116 ns = kobj_ns_ops_tbl[type]->netlink_ns(sk);
1117 spin_unlock(&kobj_ns_type_lock);
1122 const void *kobj_ns_initial(enum kobj_ns_type type)
1124 const void *ns = NULL;
1126 spin_lock(&kobj_ns_type_lock);
1127 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1128 kobj_ns_ops_tbl[type])
1129 ns = kobj_ns_ops_tbl[type]->initial_ns();
1130 spin_unlock(&kobj_ns_type_lock);
1135 void kobj_ns_drop(enum kobj_ns_type type, void *ns)
1137 spin_lock(&kobj_ns_type_lock);
1138 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1139 kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns)
1140 kobj_ns_ops_tbl[type]->drop_ns(ns);
1141 spin_unlock(&kobj_ns_type_lock);
1143 EXPORT_SYMBOL_GPL(kobj_ns_drop);