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/kobject.txt 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_ns_type_operations *ops;
88 error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj));
92 error = populate_dir(kobj);
94 sysfs_remove_dir(kobj);
99 * @kobj->sd may be deleted by an ancestor going away. Hold an
100 * extra reference so that it stays until @kobj is gone.
105 * If @kobj has ns_ops, its children need to be filtered based on
106 * their namespace tags. Enable namespace support on @kobj->sd.
108 ops = kobj_child_ns_ops(kobj);
110 BUG_ON(ops->type <= KOBJ_NS_TYPE_NONE);
111 BUG_ON(ops->type >= KOBJ_NS_TYPES);
112 BUG_ON(!kobj_ns_type_registered(ops->type));
114 sysfs_enable_ns(kobj->sd);
120 static int get_kobj_path_length(struct kobject *kobj)
123 struct kobject *parent = kobj;
125 /* walk up the ancestors until we hit the one pointing to the
127 * Add 1 to strlen for leading '/' of each level.
130 if (kobject_name(parent) == NULL)
132 length += strlen(kobject_name(parent)) + 1;
133 parent = parent->parent;
138 static int fill_kobj_path(struct kobject *kobj, char *path, int length)
140 struct kobject *parent;
143 for (parent = kobj; parent; parent = parent->parent) {
144 int cur = strlen(kobject_name(parent));
145 /* back up enough to print this name with '/' */
149 memcpy(path + length, kobject_name(parent), cur);
150 *(path + --length) = '/';
153 pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj),
154 kobj, __func__, path);
160 * kobject_get_path - generate and return the path associated with a given kobj and kset pair.
162 * @kobj: kobject in question, with which to build the path
163 * @gfp_mask: the allocation type used to allocate the path
165 * The result must be freed by the caller with kfree().
167 char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask)
173 len = get_kobj_path_length(kobj);
176 path = kzalloc(len, gfp_mask);
179 if (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 an 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 * If this function returns an error, kobject_put() must be called to
409 * properly clean up the memory associated with the object.
410 * Under no instance should the kobject that is passed to this function
411 * be directly freed with a call to kfree(), that can leak memory.
413 * Note, no "add" uevent will be created with this call, the caller should set
414 * up all of the necessary sysfs files for the object and then call
415 * kobject_uevent() with the UEVENT_ADD parameter to ensure that
416 * userspace is properly notified of this kobject's creation.
418 int kobject_add(struct kobject *kobj, struct kobject *parent,
419 const char *fmt, ...)
427 if (!kobj->state_initialized) {
428 pr_err("kobject '%s' (%p): tried to add an uninitialized object, something is seriously wrong.\n",
429 kobject_name(kobj), kobj);
434 retval = kobject_add_varg(kobj, parent, fmt, args);
439 EXPORT_SYMBOL(kobject_add);
442 * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy
443 * @kobj: pointer to the kobject to initialize
444 * @ktype: pointer to the ktype for this kobject.
445 * @parent: pointer to the parent of this kobject.
446 * @fmt: the name of the kobject.
448 * This function combines the call to kobject_init() and
449 * kobject_add(). The same type of error handling after a call to
450 * kobject_add() and kobject lifetime rules are the same here.
452 int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
453 struct kobject *parent, const char *fmt, ...)
458 kobject_init(kobj, ktype);
461 retval = kobject_add_varg(kobj, parent, fmt, args);
466 EXPORT_SYMBOL_GPL(kobject_init_and_add);
469 * kobject_rename - change the name of an object
470 * @kobj: object in question.
471 * @new_name: object's new name
473 * It is the responsibility of the caller to provide mutual
474 * exclusion between two different calls of kobject_rename
475 * on the same kobject and to ensure that new_name is valid and
476 * won't conflict with other kobjects.
478 int kobject_rename(struct kobject *kobj, const char *new_name)
481 const char *devpath = NULL;
482 const char *dup_name = NULL, *name;
483 char *devpath_string = NULL;
486 kobj = kobject_get(kobj);
492 devpath = kobject_get_path(kobj, GFP_KERNEL);
497 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
498 if (!devpath_string) {
502 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
503 envp[0] = devpath_string;
506 name = dup_name = kstrdup_const(new_name, GFP_KERNEL);
512 error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj));
516 /* Install the new kobject name */
517 dup_name = kobj->name;
520 /* This function is mostly/only used for network interface.
521 * Some hotplug package track interfaces by their name and
522 * therefore want to know when the name is changed by the user. */
523 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
526 kfree_const(dup_name);
527 kfree(devpath_string);
533 EXPORT_SYMBOL_GPL(kobject_rename);
536 * kobject_move - move object to another parent
537 * @kobj: object in question.
538 * @new_parent: object's new parent (can be NULL)
540 int kobject_move(struct kobject *kobj, struct kobject *new_parent)
543 struct kobject *old_parent;
544 const char *devpath = NULL;
545 char *devpath_string = NULL;
548 kobj = kobject_get(kobj);
551 new_parent = kobject_get(new_parent);
554 new_parent = kobject_get(&kobj->kset->kobj);
557 /* old object path */
558 devpath = kobject_get_path(kobj, GFP_KERNEL);
563 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
564 if (!devpath_string) {
568 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
569 envp[0] = devpath_string;
571 error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj));
574 old_parent = kobj->parent;
575 kobj->parent = new_parent;
577 kobject_put(old_parent);
578 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
580 kobject_put(new_parent);
582 kfree(devpath_string);
586 EXPORT_SYMBOL_GPL(kobject_move);
589 * kobject_del - unlink kobject from hierarchy.
592 void kobject_del(struct kobject *kobj)
594 struct kernfs_node *sd;
600 sysfs_remove_dir(kobj);
603 kobj->state_in_sysfs = 0;
604 kobj_kset_leave(kobj);
605 kobject_put(kobj->parent);
608 EXPORT_SYMBOL(kobject_del);
611 * kobject_get - increment refcount for object.
614 struct kobject *kobject_get(struct kobject *kobj)
617 if (!kobj->state_initialized)
619 "kobject: '%s' (%p): is not initialized, yet kobject_get() is being called.\n",
620 kobject_name(kobj), kobj);
621 kref_get(&kobj->kref);
625 EXPORT_SYMBOL(kobject_get);
627 struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj)
631 if (!kref_get_unless_zero(&kobj->kref))
635 EXPORT_SYMBOL(kobject_get_unless_zero);
638 * kobject_cleanup - free kobject resources.
639 * @kobj: object to cleanup
641 static void kobject_cleanup(struct kobject *kobj)
643 struct kobj_type *t = get_ktype(kobj);
644 const char *name = kobj->name;
646 pr_debug("kobject: '%s' (%p): %s, parent %p\n",
647 kobject_name(kobj), kobj, __func__, kobj->parent);
649 if (t && !t->release)
650 pr_debug("kobject: '%s' (%p): does not have a release() function, it is broken and must be fixed.\n",
651 kobject_name(kobj), kobj);
653 /* send "remove" if the caller did not do it but sent "add" */
654 if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) {
655 pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n",
656 kobject_name(kobj), kobj);
657 kobject_uevent(kobj, KOBJ_REMOVE);
660 /* remove from sysfs if the caller did not do it */
661 if (kobj->state_in_sysfs) {
662 pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n",
663 kobject_name(kobj), kobj);
667 if (t && t->release) {
668 pr_debug("kobject: '%s' (%p): calling ktype release\n",
669 kobject_name(kobj), kobj);
673 /* free name if we allocated it */
675 pr_debug("kobject: '%s': free name\n", name);
680 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
681 static void kobject_delayed_cleanup(struct work_struct *work)
683 kobject_cleanup(container_of(to_delayed_work(work),
684 struct kobject, release));
688 static void kobject_release(struct kref *kref)
690 struct kobject *kobj = container_of(kref, struct kobject, kref);
691 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
692 unsigned long delay = HZ + HZ * (get_random_int() & 0x3);
693 pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n",
694 kobject_name(kobj), kobj, __func__, kobj->parent, delay);
695 INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup);
697 schedule_delayed_work(&kobj->release, delay);
699 kobject_cleanup(kobj);
704 * kobject_put - decrement refcount for object.
707 * Decrement the refcount, and if 0, call kobject_cleanup().
709 void kobject_put(struct kobject *kobj)
712 if (!kobj->state_initialized)
714 "kobject: '%s' (%p): is not initialized, yet kobject_put() is being called.\n",
715 kobject_name(kobj), kobj);
716 kref_put(&kobj->kref, kobject_release);
719 EXPORT_SYMBOL(kobject_put);
721 static void dynamic_kobj_release(struct kobject *kobj)
723 pr_debug("kobject: (%p): %s\n", kobj, __func__);
727 static struct kobj_type dynamic_kobj_ktype = {
728 .release = dynamic_kobj_release,
729 .sysfs_ops = &kobj_sysfs_ops,
733 * kobject_create - create a struct kobject dynamically
735 * This function creates a kobject structure dynamically and sets it up
736 * to be a "dynamic" kobject with a default release function set up.
738 * If the kobject was not able to be created, NULL will be returned.
739 * The kobject structure returned from here must be cleaned up with a
740 * call to kobject_put() and not kfree(), as kobject_init() has
741 * already been called on this structure.
743 struct kobject *kobject_create(void)
745 struct kobject *kobj;
747 kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
751 kobject_init(kobj, &dynamic_kobj_ktype);
756 * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs
758 * @name: the name for the kobject
759 * @parent: the parent kobject of this kobject, if any.
761 * This function creates a kobject structure dynamically and registers it
762 * with sysfs. When you are finished with this structure, call
763 * kobject_put() and the structure will be dynamically freed when
764 * it is no longer being used.
766 * If the kobject was not able to be created, NULL will be returned.
768 struct kobject *kobject_create_and_add(const char *name, struct kobject *parent)
770 struct kobject *kobj;
773 kobj = kobject_create();
777 retval = kobject_add(kobj, parent, "%s", name);
779 pr_warn("%s: kobject_add error: %d\n", __func__, retval);
785 EXPORT_SYMBOL_GPL(kobject_create_and_add);
788 * kset_init - initialize a kset for use
791 void kset_init(struct kset *k)
793 kobject_init_internal(&k->kobj);
794 INIT_LIST_HEAD(&k->list);
795 spin_lock_init(&k->list_lock);
798 /* default kobject attribute operations */
799 static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr,
802 struct kobj_attribute *kattr;
805 kattr = container_of(attr, struct kobj_attribute, attr);
807 ret = kattr->show(kobj, kattr, buf);
811 static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr,
812 const char *buf, size_t count)
814 struct kobj_attribute *kattr;
817 kattr = container_of(attr, struct kobj_attribute, attr);
819 ret = kattr->store(kobj, kattr, buf, count);
823 const struct sysfs_ops kobj_sysfs_ops = {
824 .show = kobj_attr_show,
825 .store = kobj_attr_store,
827 EXPORT_SYMBOL_GPL(kobj_sysfs_ops);
830 * kset_register - initialize and add a kset.
833 int kset_register(struct kset *k)
840 if (!k->kobj.ktype) {
841 pr_err("must have a ktype to be initialized properly!\n");
846 err = kobject_add_internal(&k->kobj);
849 kobject_uevent(&k->kobj, KOBJ_ADD);
852 EXPORT_SYMBOL(kset_register);
855 * kset_unregister - remove a kset.
858 void kset_unregister(struct kset *k)
862 kobject_del(&k->kobj);
863 kobject_put(&k->kobj);
865 EXPORT_SYMBOL(kset_unregister);
868 * kset_find_obj - search for object in kset.
869 * @kset: kset we're looking in.
870 * @name: object's name.
872 * Lock kset via @kset->subsys, and iterate over @kset->list,
873 * looking for a matching kobject. If matching object is found
874 * take a reference and return the object.
876 struct kobject *kset_find_obj(struct kset *kset, const char *name)
879 struct kobject *ret = NULL;
881 spin_lock(&kset->list_lock);
883 list_for_each_entry(k, &kset->list, entry) {
884 if (kobject_name(k) && !strcmp(kobject_name(k), name)) {
885 ret = kobject_get_unless_zero(k);
890 spin_unlock(&kset->list_lock);
893 EXPORT_SYMBOL_GPL(kset_find_obj);
895 static void kset_release(struct kobject *kobj)
897 struct kset *kset = container_of(kobj, struct kset, kobj);
898 pr_debug("kobject: '%s' (%p): %s\n",
899 kobject_name(kobj), kobj, __func__);
903 void kset_get_ownership(struct kobject *kobj, kuid_t *uid, kgid_t *gid)
906 kobject_get_ownership(kobj->parent, uid, gid);
909 static struct kobj_type kset_ktype = {
910 .sysfs_ops = &kobj_sysfs_ops,
911 .release = kset_release,
912 .get_ownership = kset_get_ownership,
916 * kset_create - create a struct kset dynamically
918 * @name: the name for the kset
919 * @uevent_ops: a struct kset_uevent_ops for the kset
920 * @parent_kobj: the parent kobject of this kset, if any.
922 * This function creates a kset structure dynamically. This structure can
923 * then be registered with the system and show up in sysfs with a call to
924 * kset_register(). When you are finished with this structure, if
925 * kset_register() has been called, call kset_unregister() and the
926 * structure will be dynamically freed when it is no longer being used.
928 * If the kset was not able to be created, NULL will be returned.
930 static struct kset *kset_create(const char *name,
931 const struct kset_uevent_ops *uevent_ops,
932 struct kobject *parent_kobj)
937 kset = kzalloc(sizeof(*kset), GFP_KERNEL);
940 retval = kobject_set_name(&kset->kobj, "%s", name);
945 kset->uevent_ops = uevent_ops;
946 kset->kobj.parent = parent_kobj;
949 * The kobject of this kset will have a type of kset_ktype and belong to
950 * no kset itself. That way we can properly free it when it is
951 * finished being used.
953 kset->kobj.ktype = &kset_ktype;
954 kset->kobj.kset = NULL;
960 * kset_create_and_add - create a struct kset dynamically and add it to sysfs
962 * @name: the name for the kset
963 * @uevent_ops: a struct kset_uevent_ops for the kset
964 * @parent_kobj: the parent kobject of this kset, if any.
966 * This function creates a kset structure dynamically and registers it
967 * with sysfs. When you are finished with this structure, call
968 * kset_unregister() and the structure will be dynamically freed when it
969 * is no longer being used.
971 * If the kset was not able to be created, NULL will be returned.
973 struct kset *kset_create_and_add(const char *name,
974 const struct kset_uevent_ops *uevent_ops,
975 struct kobject *parent_kobj)
980 kset = kset_create(name, uevent_ops, parent_kobj);
983 error = kset_register(kset);
990 EXPORT_SYMBOL_GPL(kset_create_and_add);
993 static DEFINE_SPINLOCK(kobj_ns_type_lock);
994 static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES];
996 int kobj_ns_type_register(const struct kobj_ns_type_operations *ops)
998 enum kobj_ns_type type = ops->type;
1001 spin_lock(&kobj_ns_type_lock);
1004 if (type >= KOBJ_NS_TYPES)
1008 if (type <= KOBJ_NS_TYPE_NONE)
1012 if (kobj_ns_ops_tbl[type])
1016 kobj_ns_ops_tbl[type] = ops;
1019 spin_unlock(&kobj_ns_type_lock);
1023 int kobj_ns_type_registered(enum kobj_ns_type type)
1027 spin_lock(&kobj_ns_type_lock);
1028 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES))
1029 registered = kobj_ns_ops_tbl[type] != NULL;
1030 spin_unlock(&kobj_ns_type_lock);
1035 const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent)
1037 const struct kobj_ns_type_operations *ops = NULL;
1039 if (parent && parent->ktype && parent->ktype->child_ns_type)
1040 ops = parent->ktype->child_ns_type(parent);
1045 const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj)
1047 return kobj_child_ns_ops(kobj->parent);
1050 bool kobj_ns_current_may_mount(enum kobj_ns_type type)
1052 bool may_mount = true;
1054 spin_lock(&kobj_ns_type_lock);
1055 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1056 kobj_ns_ops_tbl[type])
1057 may_mount = kobj_ns_ops_tbl[type]->current_may_mount();
1058 spin_unlock(&kobj_ns_type_lock);
1063 void *kobj_ns_grab_current(enum kobj_ns_type type)
1067 spin_lock(&kobj_ns_type_lock);
1068 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1069 kobj_ns_ops_tbl[type])
1070 ns = kobj_ns_ops_tbl[type]->grab_current_ns();
1071 spin_unlock(&kobj_ns_type_lock);
1075 EXPORT_SYMBOL_GPL(kobj_ns_grab_current);
1077 const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk)
1079 const void *ns = NULL;
1081 spin_lock(&kobj_ns_type_lock);
1082 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1083 kobj_ns_ops_tbl[type])
1084 ns = kobj_ns_ops_tbl[type]->netlink_ns(sk);
1085 spin_unlock(&kobj_ns_type_lock);
1090 const void *kobj_ns_initial(enum kobj_ns_type type)
1092 const void *ns = NULL;
1094 spin_lock(&kobj_ns_type_lock);
1095 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1096 kobj_ns_ops_tbl[type])
1097 ns = kobj_ns_ops_tbl[type]->initial_ns();
1098 spin_unlock(&kobj_ns_type_lock);
1103 void kobj_ns_drop(enum kobj_ns_type type, void *ns)
1105 spin_lock(&kobj_ns_type_lock);
1106 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1107 kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns)
1108 kobj_ns_ops_tbl[type]->drop_ns(ns);
1109 spin_unlock(&kobj_ns_type_lock);
1111 EXPORT_SYMBOL_GPL(kobj_ns_drop);