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 int 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 '/' */
158 memcpy(path + length, kobject_name(parent), cur);
159 *(path + --length) = '/';
162 pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj),
163 kobj, __func__, path);
169 * kobject_get_path() - Allocate memory and fill in the path for @kobj.
170 * @kobj: kobject in question, with which to build the path
171 * @gfp_mask: the allocation type used to allocate the path
173 * Return: The newly allocated memory, caller must free with kfree().
175 char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask)
181 len = get_kobj_path_length(kobj);
184 path = kzalloc(len, gfp_mask);
187 if (fill_kobj_path(kobj, path, len)) {
194 EXPORT_SYMBOL_GPL(kobject_get_path);
196 /* add the kobject to its kset's list */
197 static void kobj_kset_join(struct kobject *kobj)
202 kset_get(kobj->kset);
203 spin_lock(&kobj->kset->list_lock);
204 list_add_tail(&kobj->entry, &kobj->kset->list);
205 spin_unlock(&kobj->kset->list_lock);
208 /* remove the kobject from its kset's list */
209 static void kobj_kset_leave(struct kobject *kobj)
214 spin_lock(&kobj->kset->list_lock);
215 list_del_init(&kobj->entry);
216 spin_unlock(&kobj->kset->list_lock);
217 kset_put(kobj->kset);
220 static void kobject_init_internal(struct kobject *kobj)
224 kref_init(&kobj->kref);
225 INIT_LIST_HEAD(&kobj->entry);
226 kobj->state_in_sysfs = 0;
227 kobj->state_add_uevent_sent = 0;
228 kobj->state_remove_uevent_sent = 0;
229 kobj->state_initialized = 1;
233 static int kobject_add_internal(struct kobject *kobj)
236 struct kobject *parent;
241 if (!kobj->name || !kobj->name[0]) {
243 "kobject: (%p): attempted to be registered with empty name!\n",
248 parent = kobject_get(kobj->parent);
250 /* join kset if set, use it as parent if we do not already have one */
253 parent = kobject_get(&kobj->kset->kobj);
254 kobj_kset_join(kobj);
255 kobj->parent = parent;
258 pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n",
259 kobject_name(kobj), kobj, __func__,
260 parent ? kobject_name(parent) : "<NULL>",
261 kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>");
263 error = create_dir(kobj);
265 kobj_kset_leave(kobj);
269 /* be noisy on error issues */
270 if (error == -EEXIST)
271 pr_err("%s failed for %s with -EEXIST, don't try to register things with the same name in the same directory.\n",
272 __func__, kobject_name(kobj));
274 pr_err("%s failed for %s (error: %d parent: %s)\n",
275 __func__, kobject_name(kobj), error,
276 parent ? kobject_name(parent) : "'none'");
278 kobj->state_in_sysfs = 1;
284 * kobject_set_name_vargs() - Set the name of a kobject.
285 * @kobj: struct kobject to set the name of
286 * @fmt: format string used to build the name
287 * @vargs: vargs to format the string.
289 int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
294 if (kobj->name && !fmt)
297 s = kvasprintf_const(GFP_KERNEL, fmt, vargs);
302 * ewww... some of these buggers have '/' in the name ... If
303 * that's the case, we need to make sure we have an actual
304 * allocated copy to modify, since kvasprintf_const may have
305 * returned something from .rodata.
307 if (strchr(s, '/')) {
310 t = kstrdup(s, GFP_KERNEL);
314 strreplace(t, '/', '!');
317 kfree_const(kobj->name);
324 * kobject_set_name() - Set the name of a kobject.
325 * @kobj: struct kobject to set the name of
326 * @fmt: format string used to build the name
328 * This sets the name of the kobject. If you have already added the
329 * kobject to the system, you must call kobject_rename() in order to
330 * change the name of the kobject.
332 int kobject_set_name(struct kobject *kobj, const char *fmt, ...)
337 va_start(vargs, fmt);
338 retval = kobject_set_name_vargs(kobj, fmt, vargs);
343 EXPORT_SYMBOL(kobject_set_name);
346 * kobject_init() - Initialize a kobject structure.
347 * @kobj: pointer to the kobject to initialize
348 * @ktype: pointer to the ktype for this kobject.
350 * This function will properly initialize a kobject such that it can then
351 * be passed to the kobject_add() call.
353 * After this function is called, the kobject MUST be cleaned up by a call
354 * to kobject_put(), not by a call to kfree directly to ensure that all of
355 * the memory is cleaned up properly.
357 void kobject_init(struct kobject *kobj, struct kobj_type *ktype)
362 err_str = "invalid kobject pointer!";
366 err_str = "must have a ktype to be initialized properly!\n";
369 if (kobj->state_initialized) {
370 /* do not error out as sometimes we can recover */
371 pr_err("kobject (%p): tried to init an initialized object, something is seriously wrong.\n",
376 kobject_init_internal(kobj);
381 pr_err("kobject (%p): %s\n", kobj, err_str);
384 EXPORT_SYMBOL(kobject_init);
386 static __printf(3, 0) int kobject_add_varg(struct kobject *kobj,
387 struct kobject *parent,
388 const char *fmt, va_list vargs)
392 retval = kobject_set_name_vargs(kobj, fmt, vargs);
394 pr_err("kobject: can not set name properly!\n");
397 kobj->parent = parent;
398 return kobject_add_internal(kobj);
402 * kobject_add() - The main kobject add function.
403 * @kobj: the kobject to add
404 * @parent: pointer to the parent of the kobject.
405 * @fmt: format to name the kobject with.
407 * The kobject name is set and added to the kobject hierarchy in this
410 * If @parent is set, then the parent of the @kobj will be set to it.
411 * If @parent is NULL, then the parent of the @kobj will be set to the
412 * kobject associated with the kset assigned to this kobject. If no kset
413 * is assigned to the kobject, then the kobject will be located in the
414 * root of the sysfs tree.
416 * Note, no "add" uevent will be created with this call, the caller should set
417 * up all of the necessary sysfs files for the object and then call
418 * kobject_uevent() with the UEVENT_ADD parameter to ensure that
419 * userspace is properly notified of this kobject's creation.
421 * Return: If this function returns an error, kobject_put() must be
422 * called to properly clean up the memory associated with the
423 * object. Under no instance should the kobject that is passed
424 * to this function be directly freed with a call to kfree(),
425 * that can leak memory.
427 * If this function returns success, kobject_put() must also be called
428 * in order to properly clean up the memory associated with the object.
430 * In short, once this function is called, kobject_put() MUST be called
431 * when the use of the object is finished in order to properly free
434 int kobject_add(struct kobject *kobj, struct kobject *parent,
435 const char *fmt, ...)
443 if (!kobj->state_initialized) {
444 pr_err("kobject '%s' (%p): tried to add an uninitialized object, something is seriously wrong.\n",
445 kobject_name(kobj), kobj);
450 retval = kobject_add_varg(kobj, parent, fmt, args);
455 EXPORT_SYMBOL(kobject_add);
458 * kobject_init_and_add() - Initialize a kobject structure and add it to
459 * the kobject hierarchy.
460 * @kobj: pointer to the kobject to initialize
461 * @ktype: pointer to the ktype for this kobject.
462 * @parent: pointer to the parent of this kobject.
463 * @fmt: the name of the kobject.
465 * This function combines the call to kobject_init() and kobject_add().
467 * If this function returns an error, kobject_put() must be called to
468 * properly clean up the memory associated with the object. This is the
469 * same type of error handling after a call to kobject_add() and kobject
470 * lifetime rules are the same here.
472 int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
473 struct kobject *parent, const char *fmt, ...)
478 kobject_init(kobj, ktype);
481 retval = kobject_add_varg(kobj, parent, fmt, args);
486 EXPORT_SYMBOL_GPL(kobject_init_and_add);
489 * kobject_rename() - Change the name of an object.
490 * @kobj: object in question.
491 * @new_name: object's new name
493 * It is the responsibility of the caller to provide mutual
494 * exclusion between two different calls of kobject_rename
495 * on the same kobject and to ensure that new_name is valid and
496 * won't conflict with other kobjects.
498 int kobject_rename(struct kobject *kobj, const char *new_name)
501 const char *devpath = NULL;
502 const char *dup_name = NULL, *name;
503 char *devpath_string = NULL;
506 kobj = kobject_get(kobj);
514 devpath = kobject_get_path(kobj, GFP_KERNEL);
519 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
520 if (!devpath_string) {
524 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
525 envp[0] = devpath_string;
528 name = dup_name = kstrdup_const(new_name, GFP_KERNEL);
534 error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj));
538 /* Install the new kobject name */
539 dup_name = kobj->name;
542 /* This function is mostly/only used for network interface.
543 * Some hotplug package track interfaces by their name and
544 * therefore want to know when the name is changed by the user. */
545 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
548 kfree_const(dup_name);
549 kfree(devpath_string);
555 EXPORT_SYMBOL_GPL(kobject_rename);
558 * kobject_move() - Move object to another parent.
559 * @kobj: object in question.
560 * @new_parent: object's new parent (can be NULL)
562 int kobject_move(struct kobject *kobj, struct kobject *new_parent)
565 struct kobject *old_parent;
566 const char *devpath = NULL;
567 char *devpath_string = NULL;
570 kobj = kobject_get(kobj);
573 new_parent = kobject_get(new_parent);
576 new_parent = kobject_get(&kobj->kset->kobj);
579 /* old object path */
580 devpath = kobject_get_path(kobj, GFP_KERNEL);
585 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
586 if (!devpath_string) {
590 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
591 envp[0] = devpath_string;
593 error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj));
596 old_parent = kobj->parent;
597 kobj->parent = new_parent;
599 kobject_put(old_parent);
600 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
602 kobject_put(new_parent);
604 kfree(devpath_string);
608 EXPORT_SYMBOL_GPL(kobject_move);
610 static void __kobject_del(struct kobject *kobj)
612 struct kernfs_node *sd;
613 const struct kobj_type *ktype;
616 ktype = get_ktype(kobj);
619 sysfs_remove_groups(kobj, ktype->default_groups);
621 /* send "remove" if the caller did not do it but sent "add" */
622 if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) {
623 pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n",
624 kobject_name(kobj), kobj);
625 kobject_uevent(kobj, KOBJ_REMOVE);
628 sysfs_remove_dir(kobj);
631 kobj->state_in_sysfs = 0;
632 kobj_kset_leave(kobj);
637 * kobject_del() - Unlink kobject from hierarchy.
640 * This is the function that should be called to delete an object
641 * successfully added via kobject_add().
643 void kobject_del(struct kobject *kobj)
645 struct kobject *parent;
650 parent = kobj->parent;
654 EXPORT_SYMBOL(kobject_del);
657 * kobject_get() - Increment refcount for object.
660 struct kobject *kobject_get(struct kobject *kobj)
663 if (!kobj->state_initialized)
665 "kobject: '%s' (%p): is not initialized, yet kobject_get() is being called.\n",
666 kobject_name(kobj), kobj);
667 kref_get(&kobj->kref);
671 EXPORT_SYMBOL(kobject_get);
673 struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj)
677 if (!kref_get_unless_zero(&kobj->kref))
681 EXPORT_SYMBOL(kobject_get_unless_zero);
684 * kobject_cleanup - free kobject resources.
685 * @kobj: object to cleanup
687 static void kobject_cleanup(struct kobject *kobj)
689 struct kobject *parent = kobj->parent;
690 struct kobj_type *t = get_ktype(kobj);
691 const char *name = kobj->name;
693 pr_debug("kobject: '%s' (%p): %s, parent %p\n",
694 kobject_name(kobj), kobj, __func__, kobj->parent);
696 if (t && !t->release)
697 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",
698 kobject_name(kobj), kobj);
700 /* remove from sysfs if the caller did not do it */
701 if (kobj->state_in_sysfs) {
702 pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n",
703 kobject_name(kobj), kobj);
706 /* avoid dropping the parent reference unnecessarily */
710 if (t && t->release) {
711 pr_debug("kobject: '%s' (%p): calling ktype release\n",
712 kobject_name(kobj), kobj);
716 /* free name if we allocated it */
718 pr_debug("kobject: '%s': free name\n", name);
725 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
726 static void kobject_delayed_cleanup(struct work_struct *work)
728 kobject_cleanup(container_of(to_delayed_work(work),
729 struct kobject, release));
733 static void kobject_release(struct kref *kref)
735 struct kobject *kobj = container_of(kref, struct kobject, kref);
736 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
737 unsigned long delay = HZ + HZ * (get_random_int() & 0x3);
738 pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n",
739 kobject_name(kobj), kobj, __func__, kobj->parent, delay);
740 INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup);
742 schedule_delayed_work(&kobj->release, delay);
744 kobject_cleanup(kobj);
749 * kobject_put() - Decrement refcount for object.
752 * Decrement the refcount, and if 0, call kobject_cleanup().
754 void kobject_put(struct kobject *kobj)
757 if (!kobj->state_initialized)
759 "kobject: '%s' (%p): is not initialized, yet kobject_put() is being called.\n",
760 kobject_name(kobj), kobj);
761 kref_put(&kobj->kref, kobject_release);
764 EXPORT_SYMBOL(kobject_put);
766 static void dynamic_kobj_release(struct kobject *kobj)
768 pr_debug("kobject: (%p): %s\n", kobj, __func__);
772 static struct kobj_type dynamic_kobj_ktype = {
773 .release = dynamic_kobj_release,
774 .sysfs_ops = &kobj_sysfs_ops,
778 * kobject_create() - Create a struct kobject dynamically.
780 * This function creates a kobject structure dynamically and sets it up
781 * to be a "dynamic" kobject with a default release function set up.
783 * If the kobject was not able to be created, NULL will be returned.
784 * The kobject structure returned from here must be cleaned up with a
785 * call to kobject_put() and not kfree(), as kobject_init() has
786 * already been called on this structure.
788 struct kobject *kobject_create(void)
790 struct kobject *kobj;
792 kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
796 kobject_init(kobj, &dynamic_kobj_ktype);
801 * kobject_create_and_add() - Create a struct kobject dynamically and
802 * register it with sysfs.
803 * @name: the name for the kobject
804 * @parent: the parent kobject of this kobject, if any.
806 * This function creates a kobject structure dynamically and registers it
807 * with sysfs. When you are finished with this structure, call
808 * kobject_put() and the structure will be dynamically freed when
809 * it is no longer being used.
811 * If the kobject was not able to be created, NULL will be returned.
813 struct kobject *kobject_create_and_add(const char *name, struct kobject *parent)
815 struct kobject *kobj;
818 kobj = kobject_create();
822 retval = kobject_add(kobj, parent, "%s", name);
824 pr_warn("%s: kobject_add error: %d\n", __func__, retval);
830 EXPORT_SYMBOL_GPL(kobject_create_and_add);
833 * kset_init() - Initialize a kset for use.
836 void kset_init(struct kset *k)
838 kobject_init_internal(&k->kobj);
839 INIT_LIST_HEAD(&k->list);
840 spin_lock_init(&k->list_lock);
843 /* default kobject attribute operations */
844 static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr,
847 struct kobj_attribute *kattr;
850 kattr = container_of(attr, struct kobj_attribute, attr);
852 ret = kattr->show(kobj, kattr, buf);
856 static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr,
857 const char *buf, size_t count)
859 struct kobj_attribute *kattr;
862 kattr = container_of(attr, struct kobj_attribute, attr);
864 ret = kattr->store(kobj, kattr, buf, count);
868 const struct sysfs_ops kobj_sysfs_ops = {
869 .show = kobj_attr_show,
870 .store = kobj_attr_store,
872 EXPORT_SYMBOL_GPL(kobj_sysfs_ops);
875 * kset_register() - Initialize and add a kset.
878 int kset_register(struct kset *k)
885 if (!k->kobj.ktype) {
886 pr_err("must have a ktype to be initialized properly!\n");
891 err = kobject_add_internal(&k->kobj);
894 kobject_uevent(&k->kobj, KOBJ_ADD);
897 EXPORT_SYMBOL(kset_register);
900 * kset_unregister() - Remove a kset.
903 void kset_unregister(struct kset *k)
907 kobject_del(&k->kobj);
908 kobject_put(&k->kobj);
910 EXPORT_SYMBOL(kset_unregister);
913 * kset_find_obj() - Search for object in kset.
914 * @kset: kset we're looking in.
915 * @name: object's name.
917 * Lock kset via @kset->subsys, and iterate over @kset->list,
918 * looking for a matching kobject. If matching object is found
919 * take a reference and return the object.
921 struct kobject *kset_find_obj(struct kset *kset, const char *name)
924 struct kobject *ret = NULL;
926 spin_lock(&kset->list_lock);
928 list_for_each_entry(k, &kset->list, entry) {
929 if (kobject_name(k) && !strcmp(kobject_name(k), name)) {
930 ret = kobject_get_unless_zero(k);
935 spin_unlock(&kset->list_lock);
938 EXPORT_SYMBOL_GPL(kset_find_obj);
940 static void kset_release(struct kobject *kobj)
942 struct kset *kset = container_of(kobj, struct kset, kobj);
943 pr_debug("kobject: '%s' (%p): %s\n",
944 kobject_name(kobj), kobj, __func__);
948 static void kset_get_ownership(struct kobject *kobj, kuid_t *uid, kgid_t *gid)
951 kobject_get_ownership(kobj->parent, uid, gid);
954 static struct kobj_type kset_ktype = {
955 .sysfs_ops = &kobj_sysfs_ops,
956 .release = kset_release,
957 .get_ownership = kset_get_ownership,
961 * kset_create() - Create a struct kset dynamically.
963 * @name: the name for the kset
964 * @uevent_ops: a struct kset_uevent_ops for the kset
965 * @parent_kobj: the parent kobject of this kset, if any.
967 * This function creates a kset structure dynamically. This structure can
968 * then be registered with the system and show up in sysfs with a call to
969 * kset_register(). When you are finished with this structure, if
970 * kset_register() has been called, call kset_unregister() and the
971 * structure will be dynamically freed when it is no longer being used.
973 * If the kset was not able to be created, NULL will be returned.
975 static struct kset *kset_create(const char *name,
976 const struct kset_uevent_ops *uevent_ops,
977 struct kobject *parent_kobj)
982 kset = kzalloc(sizeof(*kset), GFP_KERNEL);
985 retval = kobject_set_name(&kset->kobj, "%s", name);
990 kset->uevent_ops = uevent_ops;
991 kset->kobj.parent = parent_kobj;
994 * The kobject of this kset will have a type of kset_ktype and belong to
995 * no kset itself. That way we can properly free it when it is
996 * finished being used.
998 kset->kobj.ktype = &kset_ktype;
999 kset->kobj.kset = NULL;
1005 * kset_create_and_add() - Create a struct kset dynamically and add it to sysfs.
1007 * @name: the name for the kset
1008 * @uevent_ops: a struct kset_uevent_ops for the kset
1009 * @parent_kobj: the parent kobject of this kset, if any.
1011 * This function creates a kset structure dynamically and registers it
1012 * with sysfs. When you are finished with this structure, call
1013 * kset_unregister() and the structure will be dynamically freed when it
1014 * is no longer being used.
1016 * If the kset was not able to be created, NULL will be returned.
1018 struct kset *kset_create_and_add(const char *name,
1019 const struct kset_uevent_ops *uevent_ops,
1020 struct kobject *parent_kobj)
1025 kset = kset_create(name, uevent_ops, parent_kobj);
1028 error = kset_register(kset);
1035 EXPORT_SYMBOL_GPL(kset_create_and_add);
1038 static DEFINE_SPINLOCK(kobj_ns_type_lock);
1039 static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES];
1041 int kobj_ns_type_register(const struct kobj_ns_type_operations *ops)
1043 enum kobj_ns_type type = ops->type;
1046 spin_lock(&kobj_ns_type_lock);
1049 if (type >= KOBJ_NS_TYPES)
1053 if (type <= KOBJ_NS_TYPE_NONE)
1057 if (kobj_ns_ops_tbl[type])
1061 kobj_ns_ops_tbl[type] = ops;
1064 spin_unlock(&kobj_ns_type_lock);
1068 int kobj_ns_type_registered(enum kobj_ns_type type)
1072 spin_lock(&kobj_ns_type_lock);
1073 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES))
1074 registered = kobj_ns_ops_tbl[type] != NULL;
1075 spin_unlock(&kobj_ns_type_lock);
1080 const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent)
1082 const struct kobj_ns_type_operations *ops = NULL;
1084 if (parent && parent->ktype && parent->ktype->child_ns_type)
1085 ops = parent->ktype->child_ns_type(parent);
1090 const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj)
1092 return kobj_child_ns_ops(kobj->parent);
1095 bool kobj_ns_current_may_mount(enum kobj_ns_type type)
1097 bool may_mount = true;
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 may_mount = kobj_ns_ops_tbl[type]->current_may_mount();
1103 spin_unlock(&kobj_ns_type_lock);
1108 void *kobj_ns_grab_current(enum kobj_ns_type type)
1112 spin_lock(&kobj_ns_type_lock);
1113 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1114 kobj_ns_ops_tbl[type])
1115 ns = kobj_ns_ops_tbl[type]->grab_current_ns();
1116 spin_unlock(&kobj_ns_type_lock);
1120 EXPORT_SYMBOL_GPL(kobj_ns_grab_current);
1122 const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk)
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]->netlink_ns(sk);
1130 spin_unlock(&kobj_ns_type_lock);
1135 const void *kobj_ns_initial(enum kobj_ns_type type)
1137 const void *ns = NULL;
1139 spin_lock(&kobj_ns_type_lock);
1140 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1141 kobj_ns_ops_tbl[type])
1142 ns = kobj_ns_ops_tbl[type]->initial_ns();
1143 spin_unlock(&kobj_ns_type_lock);
1148 void kobj_ns_drop(enum kobj_ns_type type, void *ns)
1150 spin_lock(&kobj_ns_type_lock);
1151 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1152 kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns)
1153 kobj_ns_ops_tbl[type]->drop_ns(ns);
1154 spin_unlock(&kobj_ns_type_lock);
1156 EXPORT_SYMBOL_GPL(kobj_ns_drop);