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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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(const 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 * kobject_get_ownership() - Get sysfs ownership data for @kobj.
42 * @kobj: kobject in question
43 * @uid: kernel user ID for sysfs objects
44 * @gid: kernel group ID for sysfs objects
46 * Returns initial uid/gid pair that should be used when creating sysfs
47 * representation of given kobject. Normally used to adjust ownership of
48 * objects in a container.
50 void kobject_get_ownership(const struct kobject *kobj, kuid_t *uid, kgid_t *gid)
52 *uid = GLOBAL_ROOT_UID;
53 *gid = GLOBAL_ROOT_GID;
55 if (kobj->ktype->get_ownership)
56 kobj->ktype->get_ownership(kobj, uid, gid);
59 static bool kobj_ns_type_is_valid(enum kobj_ns_type type)
61 if ((type <= KOBJ_NS_TYPE_NONE) || (type >= KOBJ_NS_TYPES))
67 static int create_dir(struct kobject *kobj)
69 const struct kobj_type *ktype = get_ktype(kobj);
70 const struct kobj_ns_type_operations *ops;
73 error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj));
78 error = sysfs_create_groups(kobj, ktype->default_groups);
80 sysfs_remove_dir(kobj);
86 * @kobj->sd may be deleted by an ancestor going away. Hold an
87 * extra reference so that it stays until @kobj is gone.
92 * If @kobj has ns_ops, its children need to be filtered based on
93 * their namespace tags. Enable namespace support on @kobj->sd.
95 ops = kobj_child_ns_ops(kobj);
97 BUG_ON(!kobj_ns_type_is_valid(ops->type));
98 BUG_ON(!kobj_ns_type_registered(ops->type));
100 sysfs_enable_ns(kobj->sd);
106 static int get_kobj_path_length(const struct kobject *kobj)
109 const struct kobject *parent = kobj;
111 /* walk up the ancestors until we hit the one pointing to the
113 * Add 1 to strlen for leading '/' of each level.
116 if (kobject_name(parent) == NULL)
118 length += strlen(kobject_name(parent)) + 1;
119 parent = parent->parent;
124 static int fill_kobj_path(const struct kobject *kobj, char *path, int length)
126 const struct kobject *parent;
129 for (parent = kobj; parent; parent = parent->parent) {
130 int cur = strlen(kobject_name(parent));
131 /* back up enough to print this name with '/' */
135 memcpy(path + length, kobject_name(parent), cur);
136 *(path + --length) = '/';
139 pr_debug("'%s' (%p): %s: path = '%s'\n", kobject_name(kobj),
140 kobj, __func__, path);
146 * kobject_get_path() - Allocate memory and fill in the path for @kobj.
147 * @kobj: kobject in question, with which to build the path
148 * @gfp_mask: the allocation type used to allocate the path
150 * Return: The newly allocated memory, caller must free with kfree().
152 char *kobject_get_path(const struct kobject *kobj, gfp_t gfp_mask)
158 len = get_kobj_path_length(kobj);
161 path = kzalloc(len, gfp_mask);
164 if (fill_kobj_path(kobj, path, len)) {
171 EXPORT_SYMBOL_GPL(kobject_get_path);
173 /* add the kobject to its kset's list */
174 static void kobj_kset_join(struct kobject *kobj)
179 kset_get(kobj->kset);
180 spin_lock(&kobj->kset->list_lock);
181 list_add_tail(&kobj->entry, &kobj->kset->list);
182 spin_unlock(&kobj->kset->list_lock);
185 /* remove the kobject from its kset's list */
186 static void kobj_kset_leave(struct kobject *kobj)
191 spin_lock(&kobj->kset->list_lock);
192 list_del_init(&kobj->entry);
193 spin_unlock(&kobj->kset->list_lock);
194 kset_put(kobj->kset);
197 static void kobject_init_internal(struct kobject *kobj)
201 kref_init(&kobj->kref);
202 INIT_LIST_HEAD(&kobj->entry);
203 kobj->state_in_sysfs = 0;
204 kobj->state_add_uevent_sent = 0;
205 kobj->state_remove_uevent_sent = 0;
206 kobj->state_initialized = 1;
210 static int kobject_add_internal(struct kobject *kobj)
213 struct kobject *parent;
218 if (!kobj->name || !kobj->name[0]) {
220 "kobject: (%p): attempted to be registered with empty name!\n",
225 parent = kobject_get(kobj->parent);
227 /* join kset if set, use it as parent if we do not already have one */
230 parent = kobject_get(&kobj->kset->kobj);
231 kobj_kset_join(kobj);
232 kobj->parent = parent;
235 pr_debug("'%s' (%p): %s: parent: '%s', set: '%s'\n",
236 kobject_name(kobj), kobj, __func__,
237 parent ? kobject_name(parent) : "<NULL>",
238 kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>");
240 error = create_dir(kobj);
242 kobj_kset_leave(kobj);
246 /* be noisy on error issues */
247 if (error == -EEXIST)
248 pr_err("%s failed for %s with -EEXIST, don't try to register things with the same name in the same directory.\n",
249 __func__, kobject_name(kobj));
251 pr_err("%s failed for %s (error: %d parent: %s)\n",
252 __func__, kobject_name(kobj), error,
253 parent ? kobject_name(parent) : "'none'");
255 kobj->state_in_sysfs = 1;
261 * kobject_set_name_vargs() - Set the name of a kobject.
262 * @kobj: struct kobject to set the name of
263 * @fmt: format string used to build the name
264 * @vargs: vargs to format the string.
266 int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
271 if (kobj->name && !fmt)
274 s = kvasprintf_const(GFP_KERNEL, fmt, vargs);
279 * ewww... some of these buggers have '/' in the name ... If
280 * that's the case, we need to make sure we have an actual
281 * allocated copy to modify, since kvasprintf_const may have
282 * returned something from .rodata.
284 if (strchr(s, '/')) {
287 t = kstrdup(s, GFP_KERNEL);
291 s = strreplace(t, '/', '!');
293 kfree_const(kobj->name);
300 * kobject_set_name() - Set the name of a kobject.
301 * @kobj: struct kobject to set the name of
302 * @fmt: format string used to build the name
304 * This sets the name of the kobject. If you have already added the
305 * kobject to the system, you must call kobject_rename() in order to
306 * change the name of the kobject.
308 int kobject_set_name(struct kobject *kobj, const char *fmt, ...)
313 va_start(vargs, fmt);
314 retval = kobject_set_name_vargs(kobj, fmt, vargs);
319 EXPORT_SYMBOL(kobject_set_name);
322 * kobject_init() - Initialize a kobject structure.
323 * @kobj: pointer to the kobject to initialize
324 * @ktype: pointer to the ktype for this kobject.
326 * This function will properly initialize a kobject such that it can then
327 * be passed to the kobject_add() call.
329 * After this function is called, the kobject MUST be cleaned up by a call
330 * to kobject_put(), not by a call to kfree directly to ensure that all of
331 * the memory is cleaned up properly.
333 void kobject_init(struct kobject *kobj, const struct kobj_type *ktype)
338 err_str = "invalid kobject pointer!";
342 err_str = "must have a ktype to be initialized properly!\n";
345 if (kobj->state_initialized) {
346 /* do not error out as sometimes we can recover */
347 pr_err("kobject (%p): tried to init an initialized object, something is seriously wrong.\n",
349 dump_stack_lvl(KERN_ERR);
352 kobject_init_internal(kobj);
357 pr_err("kobject (%p): %s\n", kobj, err_str);
358 dump_stack_lvl(KERN_ERR);
360 EXPORT_SYMBOL(kobject_init);
362 static __printf(3, 0) int kobject_add_varg(struct kobject *kobj,
363 struct kobject *parent,
364 const char *fmt, va_list vargs)
368 retval = kobject_set_name_vargs(kobj, fmt, vargs);
370 pr_err("can not set name properly!\n");
373 kobj->parent = parent;
374 return kobject_add_internal(kobj);
378 * kobject_add() - The main kobject add function.
379 * @kobj: the kobject to add
380 * @parent: pointer to the parent of the kobject.
381 * @fmt: format to name the kobject with.
383 * The kobject name is set and added to the kobject hierarchy in this
386 * If @parent is set, then the parent of the @kobj will be set to it.
387 * If @parent is NULL, then the parent of the @kobj will be set to the
388 * kobject associated with the kset assigned to this kobject. If no kset
389 * is assigned to the kobject, then the kobject will be located in the
390 * root of the sysfs tree.
392 * Note, no "add" uevent will be created with this call, the caller should set
393 * up all of the necessary sysfs files for the object and then call
394 * kobject_uevent() with the UEVENT_ADD parameter to ensure that
395 * userspace is properly notified of this kobject's creation.
397 * Return: If this function returns an error, kobject_put() must be
398 * called to properly clean up the memory associated with the
399 * object. Under no instance should the kobject that is passed
400 * to this function be directly freed with a call to kfree(),
401 * that can leak memory.
403 * If this function returns success, kobject_put() must also be called
404 * in order to properly clean up the memory associated with the object.
406 * In short, once this function is called, kobject_put() MUST be called
407 * when the use of the object is finished in order to properly free
410 int kobject_add(struct kobject *kobj, struct kobject *parent,
411 const char *fmt, ...)
419 if (!kobj->state_initialized) {
420 pr_err("kobject '%s' (%p): tried to add an uninitialized object, something is seriously wrong.\n",
421 kobject_name(kobj), kobj);
422 dump_stack_lvl(KERN_ERR);
426 retval = kobject_add_varg(kobj, parent, fmt, args);
431 EXPORT_SYMBOL(kobject_add);
434 * kobject_init_and_add() - Initialize a kobject structure and add it to
435 * the kobject hierarchy.
436 * @kobj: pointer to the kobject to initialize
437 * @ktype: pointer to the ktype for this kobject.
438 * @parent: pointer to the parent of this kobject.
439 * @fmt: the name of the kobject.
441 * This function combines the call to kobject_init() and kobject_add().
443 * If this function returns an error, kobject_put() must be called to
444 * properly clean up the memory associated with the object. This is the
445 * same type of error handling after a call to kobject_add() and kobject
446 * lifetime rules are the same here.
448 int kobject_init_and_add(struct kobject *kobj, const struct kobj_type *ktype,
449 struct kobject *parent, const char *fmt, ...)
454 kobject_init(kobj, ktype);
457 retval = kobject_add_varg(kobj, parent, fmt, args);
462 EXPORT_SYMBOL_GPL(kobject_init_and_add);
465 * kobject_rename() - Change the name of an object.
466 * @kobj: object in question.
467 * @new_name: object's new name
469 * It is the responsibility of the caller to provide mutual
470 * exclusion between two different calls of kobject_rename
471 * on the same kobject and to ensure that new_name is valid and
472 * won't conflict with other kobjects.
474 int kobject_rename(struct kobject *kobj, const char *new_name)
477 const char *devpath = NULL;
478 const char *dup_name = NULL, *name;
479 char *devpath_string = NULL;
482 kobj = kobject_get(kobj);
490 devpath = kobject_get_path(kobj, GFP_KERNEL);
495 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
496 if (!devpath_string) {
500 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
501 envp[0] = devpath_string;
504 name = dup_name = kstrdup_const(new_name, GFP_KERNEL);
510 error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj));
514 /* Install the new kobject name */
515 dup_name = kobj->name;
518 /* This function is mostly/only used for network interface.
519 * Some hotplug package track interfaces by their name and
520 * therefore want to know when the name is changed by the user. */
521 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
524 kfree_const(dup_name);
525 kfree(devpath_string);
531 EXPORT_SYMBOL_GPL(kobject_rename);
534 * kobject_move() - Move object to another parent.
535 * @kobj: object in question.
536 * @new_parent: object's new parent (can be NULL)
538 int kobject_move(struct kobject *kobj, struct kobject *new_parent)
541 struct kobject *old_parent;
542 const char *devpath = NULL;
543 char *devpath_string = NULL;
546 kobj = kobject_get(kobj);
549 new_parent = kobject_get(new_parent);
552 new_parent = kobject_get(&kobj->kset->kobj);
555 /* old object path */
556 devpath = kobject_get_path(kobj, GFP_KERNEL);
561 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
562 if (!devpath_string) {
566 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
567 envp[0] = devpath_string;
569 error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj));
572 old_parent = kobj->parent;
573 kobj->parent = new_parent;
575 kobject_put(old_parent);
576 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
578 kobject_put(new_parent);
580 kfree(devpath_string);
584 EXPORT_SYMBOL_GPL(kobject_move);
586 static void __kobject_del(struct kobject *kobj)
588 struct kernfs_node *sd;
589 const struct kobj_type *ktype;
592 ktype = get_ktype(kobj);
595 sysfs_remove_groups(kobj, ktype->default_groups);
597 /* send "remove" if the caller did not do it but sent "add" */
598 if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) {
599 pr_debug("'%s' (%p): auto cleanup 'remove' event\n",
600 kobject_name(kobj), kobj);
601 kobject_uevent(kobj, KOBJ_REMOVE);
604 sysfs_remove_dir(kobj);
607 kobj->state_in_sysfs = 0;
608 kobj_kset_leave(kobj);
613 * kobject_del() - Unlink kobject from hierarchy.
616 * This is the function that should be called to delete an object
617 * successfully added via kobject_add().
619 void kobject_del(struct kobject *kobj)
621 struct kobject *parent;
626 parent = kobj->parent;
630 EXPORT_SYMBOL(kobject_del);
633 * kobject_get() - Increment refcount for object.
636 struct kobject *kobject_get(struct kobject *kobj)
639 if (!kobj->state_initialized)
641 "kobject: '%s' (%p): is not initialized, yet kobject_get() is being called.\n",
642 kobject_name(kobj), kobj);
643 kref_get(&kobj->kref);
647 EXPORT_SYMBOL(kobject_get);
649 struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj)
653 if (!kref_get_unless_zero(&kobj->kref))
657 EXPORT_SYMBOL(kobject_get_unless_zero);
660 * kobject_cleanup - free kobject resources.
661 * @kobj: object to cleanup
663 static void kobject_cleanup(struct kobject *kobj)
665 struct kobject *parent = kobj->parent;
666 const struct kobj_type *t = get_ktype(kobj);
667 const char *name = kobj->name;
669 pr_debug("'%s' (%p): %s, parent %p\n",
670 kobject_name(kobj), kobj, __func__, kobj->parent);
672 if (t && !t->release)
673 pr_debug("'%s' (%p): does not have a release() function, it is broken and must be fixed. See Documentation/core-api/kobject.rst.\n",
674 kobject_name(kobj), kobj);
676 /* remove from sysfs if the caller did not do it */
677 if (kobj->state_in_sysfs) {
678 pr_debug("'%s' (%p): auto cleanup kobject_del\n",
679 kobject_name(kobj), kobj);
682 /* avoid dropping the parent reference unnecessarily */
686 if (t && t->release) {
687 pr_debug("'%s' (%p): calling ktype release\n",
688 kobject_name(kobj), kobj);
692 /* free name if we allocated it */
694 pr_debug("'%s': free name\n", name);
701 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
702 static void kobject_delayed_cleanup(struct work_struct *work)
704 kobject_cleanup(container_of(to_delayed_work(work),
705 struct kobject, release));
709 static void kobject_release(struct kref *kref)
711 struct kobject *kobj = container_of(kref, struct kobject, kref);
712 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
713 unsigned long delay = HZ + HZ * get_random_u32_below(4);
714 pr_info("'%s' (%p): %s, parent %p (delayed %ld)\n",
715 kobject_name(kobj), kobj, __func__, kobj->parent, delay);
716 INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup);
718 schedule_delayed_work(&kobj->release, delay);
720 kobject_cleanup(kobj);
725 * kobject_put() - Decrement refcount for object.
728 * Decrement the refcount, and if 0, call kobject_cleanup().
730 void kobject_put(struct kobject *kobj)
733 if (!kobj->state_initialized)
735 "kobject: '%s' (%p): is not initialized, yet kobject_put() is being called.\n",
736 kobject_name(kobj), kobj);
737 kref_put(&kobj->kref, kobject_release);
740 EXPORT_SYMBOL(kobject_put);
742 static void dynamic_kobj_release(struct kobject *kobj)
744 pr_debug("(%p): %s\n", kobj, __func__);
748 static const struct kobj_type dynamic_kobj_ktype = {
749 .release = dynamic_kobj_release,
750 .sysfs_ops = &kobj_sysfs_ops,
754 * kobject_create() - Create a struct kobject dynamically.
756 * This function creates a kobject structure dynamically and sets it up
757 * to be a "dynamic" kobject with a default release function set up.
759 * If the kobject was not able to be created, NULL will be returned.
760 * The kobject structure returned from here must be cleaned up with a
761 * call to kobject_put() and not kfree(), as kobject_init() has
762 * already been called on this structure.
764 static struct kobject *kobject_create(void)
766 struct kobject *kobj;
768 kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
772 kobject_init(kobj, &dynamic_kobj_ktype);
777 * kobject_create_and_add() - Create a struct kobject dynamically and
778 * register it with sysfs.
779 * @name: the name for the kobject
780 * @parent: the parent kobject of this kobject, if any.
782 * This function creates a kobject structure dynamically and registers it
783 * with sysfs. When you are finished with this structure, call
784 * kobject_put() and the structure will be dynamically freed when
785 * it is no longer being used.
787 * If the kobject was not able to be created, NULL will be returned.
789 struct kobject *kobject_create_and_add(const char *name, struct kobject *parent)
791 struct kobject *kobj;
794 kobj = kobject_create();
798 retval = kobject_add(kobj, parent, "%s", name);
800 pr_warn("%s: kobject_add error: %d\n", __func__, retval);
806 EXPORT_SYMBOL_GPL(kobject_create_and_add);
809 * kset_init() - Initialize a kset for use.
812 void kset_init(struct kset *k)
814 kobject_init_internal(&k->kobj);
815 INIT_LIST_HEAD(&k->list);
816 spin_lock_init(&k->list_lock);
819 /* default kobject attribute operations */
820 static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr,
823 struct kobj_attribute *kattr;
826 kattr = container_of(attr, struct kobj_attribute, attr);
828 ret = kattr->show(kobj, kattr, buf);
832 static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr,
833 const char *buf, size_t count)
835 struct kobj_attribute *kattr;
838 kattr = container_of(attr, struct kobj_attribute, attr);
840 ret = kattr->store(kobj, kattr, buf, count);
844 const struct sysfs_ops kobj_sysfs_ops = {
845 .show = kobj_attr_show,
846 .store = kobj_attr_store,
848 EXPORT_SYMBOL_GPL(kobj_sysfs_ops);
851 * kset_register() - Initialize and add a kset.
854 * NOTE: On error, the kset.kobj.name allocated by() kobj_set_name()
855 * is freed, it can not be used any more.
857 int kset_register(struct kset *k)
864 if (!k->kobj.ktype) {
865 pr_err("must have a ktype to be initialized properly!\n");
870 err = kobject_add_internal(&k->kobj);
872 kfree_const(k->kobj.name);
873 /* Set it to NULL to avoid accessing bad pointer in callers. */
877 kobject_uevent(&k->kobj, KOBJ_ADD);
880 EXPORT_SYMBOL(kset_register);
883 * kset_unregister() - Remove a kset.
886 void kset_unregister(struct kset *k)
890 kobject_del(&k->kobj);
891 kobject_put(&k->kobj);
893 EXPORT_SYMBOL(kset_unregister);
896 * kset_find_obj() - Search for object in kset.
897 * @kset: kset we're looking in.
898 * @name: object's name.
900 * Lock kset via @kset->subsys, and iterate over @kset->list,
901 * looking for a matching kobject. If matching object is found
902 * take a reference and return the object.
904 struct kobject *kset_find_obj(struct kset *kset, const char *name)
907 struct kobject *ret = NULL;
909 spin_lock(&kset->list_lock);
911 list_for_each_entry(k, &kset->list, entry) {
912 if (kobject_name(k) && !strcmp(kobject_name(k), name)) {
913 ret = kobject_get_unless_zero(k);
918 spin_unlock(&kset->list_lock);
921 EXPORT_SYMBOL_GPL(kset_find_obj);
923 static void kset_release(struct kobject *kobj)
925 struct kset *kset = container_of(kobj, struct kset, kobj);
926 pr_debug("'%s' (%p): %s\n",
927 kobject_name(kobj), kobj, __func__);
931 static void kset_get_ownership(const struct kobject *kobj, kuid_t *uid, kgid_t *gid)
934 kobject_get_ownership(kobj->parent, uid, gid);
937 static const struct kobj_type kset_ktype = {
938 .sysfs_ops = &kobj_sysfs_ops,
939 .release = kset_release,
940 .get_ownership = kset_get_ownership,
944 * kset_create() - Create a struct kset dynamically.
946 * @name: the name for the kset
947 * @uevent_ops: a struct kset_uevent_ops for the kset
948 * @parent_kobj: the parent kobject of this kset, if any.
950 * This function creates a kset structure dynamically. This structure can
951 * then be registered with the system and show up in sysfs with a call to
952 * kset_register(). When you are finished with this structure, if
953 * kset_register() has been called, call kset_unregister() and the
954 * structure will be dynamically freed when it is no longer being used.
956 * If the kset was not able to be created, NULL will be returned.
958 static struct kset *kset_create(const char *name,
959 const struct kset_uevent_ops *uevent_ops,
960 struct kobject *parent_kobj)
965 kset = kzalloc(sizeof(*kset), GFP_KERNEL);
968 retval = kobject_set_name(&kset->kobj, "%s", name);
973 kset->uevent_ops = uevent_ops;
974 kset->kobj.parent = parent_kobj;
977 * The kobject of this kset will have a type of kset_ktype and belong to
978 * no kset itself. That way we can properly free it when it is
979 * finished being used.
981 kset->kobj.ktype = &kset_ktype;
982 kset->kobj.kset = NULL;
988 * kset_create_and_add() - Create a struct kset dynamically and add it to sysfs.
990 * @name: the name for the kset
991 * @uevent_ops: a struct kset_uevent_ops for the kset
992 * @parent_kobj: the parent kobject of this kset, if any.
994 * This function creates a kset structure dynamically and registers it
995 * with sysfs. When you are finished with this structure, call
996 * kset_unregister() and the structure will be dynamically freed when it
997 * is no longer being used.
999 * If the kset was not able to be created, NULL will be returned.
1001 struct kset *kset_create_and_add(const char *name,
1002 const struct kset_uevent_ops *uevent_ops,
1003 struct kobject *parent_kobj)
1008 kset = kset_create(name, uevent_ops, parent_kobj);
1011 error = kset_register(kset);
1018 EXPORT_SYMBOL_GPL(kset_create_and_add);
1021 static DEFINE_SPINLOCK(kobj_ns_type_lock);
1022 static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES];
1024 int kobj_ns_type_register(const struct kobj_ns_type_operations *ops)
1026 enum kobj_ns_type type = ops->type;
1029 spin_lock(&kobj_ns_type_lock);
1032 if (!kobj_ns_type_is_valid(type))
1036 if (kobj_ns_ops_tbl[type])
1040 kobj_ns_ops_tbl[type] = ops;
1043 spin_unlock(&kobj_ns_type_lock);
1047 int kobj_ns_type_registered(enum kobj_ns_type type)
1051 spin_lock(&kobj_ns_type_lock);
1052 if (kobj_ns_type_is_valid(type))
1053 registered = kobj_ns_ops_tbl[type] != NULL;
1054 spin_unlock(&kobj_ns_type_lock);
1059 const struct kobj_ns_type_operations *kobj_child_ns_ops(const struct kobject *parent)
1061 const struct kobj_ns_type_operations *ops = NULL;
1063 if (parent && parent->ktype && parent->ktype->child_ns_type)
1064 ops = parent->ktype->child_ns_type(parent);
1069 const struct kobj_ns_type_operations *kobj_ns_ops(const struct kobject *kobj)
1071 return kobj_child_ns_ops(kobj->parent);
1074 bool kobj_ns_current_may_mount(enum kobj_ns_type type)
1076 bool may_mount = true;
1078 spin_lock(&kobj_ns_type_lock);
1079 if (kobj_ns_type_is_valid(type) && kobj_ns_ops_tbl[type])
1080 may_mount = kobj_ns_ops_tbl[type]->current_may_mount();
1081 spin_unlock(&kobj_ns_type_lock);
1086 void *kobj_ns_grab_current(enum kobj_ns_type type)
1090 spin_lock(&kobj_ns_type_lock);
1091 if (kobj_ns_type_is_valid(type) && kobj_ns_ops_tbl[type])
1092 ns = kobj_ns_ops_tbl[type]->grab_current_ns();
1093 spin_unlock(&kobj_ns_type_lock);
1097 EXPORT_SYMBOL_GPL(kobj_ns_grab_current);
1099 const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk)
1101 const void *ns = NULL;
1103 spin_lock(&kobj_ns_type_lock);
1104 if (kobj_ns_type_is_valid(type) && kobj_ns_ops_tbl[type])
1105 ns = kobj_ns_ops_tbl[type]->netlink_ns(sk);
1106 spin_unlock(&kobj_ns_type_lock);
1111 const void *kobj_ns_initial(enum kobj_ns_type type)
1113 const void *ns = NULL;
1115 spin_lock(&kobj_ns_type_lock);
1116 if (kobj_ns_type_is_valid(type) && kobj_ns_ops_tbl[type])
1117 ns = kobj_ns_ops_tbl[type]->initial_ns();
1118 spin_unlock(&kobj_ns_type_lock);
1123 void kobj_ns_drop(enum kobj_ns_type type, void *ns)
1125 spin_lock(&kobj_ns_type_lock);
1126 if (kobj_ns_type_is_valid(type) &&
1127 kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns)
1128 kobj_ns_ops_tbl[type]->drop_ns(ns);
1129 spin_unlock(&kobj_ns_type_lock);
1131 EXPORT_SYMBOL_GPL(kobj_ns_drop);