2 * kobject.c - library routines for handling generic kernel objects
4 * Copyright (c) 2002-2003 Patrick Mochel <mochel@osdl.org>
5 * Copyright (c) 2006-2007 Greg Kroah-Hartman <greg@kroah.com>
6 * Copyright (c) 2006-2007 Novell Inc.
8 * This file is released under the GPLv2.
11 * Please see the file Documentation/kobject.txt for critical information
12 * about using the kobject interface.
15 #include <linux/kobject.h>
16 #include <linux/kobj_completion.h>
17 #include <linux/string.h>
18 #include <linux/export.h>
19 #include <linux/stat.h>
20 #include <linux/slab.h>
21 #include <linux/random.h>
24 * kobject_namespace - return @kobj's namespace tag
25 * @kobj: kobject in question
27 * Returns namespace tag of @kobj if its parent has namespace ops enabled
28 * and thus @kobj should have a namespace tag associated with it. Returns
31 const void *kobject_namespace(struct kobject *kobj)
33 const struct kobj_ns_type_operations *ns_ops = kobj_ns_ops(kobj);
35 if (!ns_ops || ns_ops->type == KOBJ_NS_TYPE_NONE)
38 return kobj->ktype->namespace(kobj);
42 * populate_dir - populate directory with attributes.
43 * @kobj: object we're working on.
45 * Most subsystems have a set of default attributes that are associated
46 * with an object that registers with them. This is a helper called during
47 * object registration that loops through the default attributes of the
48 * subsystem and creates attributes files for them in sysfs.
50 static int populate_dir(struct kobject *kobj)
52 struct kobj_type *t = get_ktype(kobj);
53 struct attribute *attr;
57 if (t && t->default_attrs) {
58 for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) {
59 error = sysfs_create_file(kobj, attr);
67 static int create_dir(struct kobject *kobj)
69 const struct kobj_ns_type_operations *ops;
72 error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj));
76 error = populate_dir(kobj);
78 sysfs_remove_dir(kobj);
83 * @kobj->sd may be deleted by an ancestor going away. Hold an
84 * extra reference so that it stays until @kobj is gone.
89 * If @kobj has ns_ops, its children need to be filtered based on
90 * their namespace tags. Enable namespace support on @kobj->sd.
92 ops = kobj_child_ns_ops(kobj);
94 BUG_ON(ops->type <= KOBJ_NS_TYPE_NONE);
95 BUG_ON(ops->type >= KOBJ_NS_TYPES);
96 BUG_ON(!kobj_ns_type_registered(ops->type));
98 kernfs_enable_ns(kobj->sd);
104 static int get_kobj_path_length(struct kobject *kobj)
107 struct kobject *parent = kobj;
109 /* walk up the ancestors until we hit the one pointing to the
111 * Add 1 to strlen for leading '/' of each level.
114 if (kobject_name(parent) == NULL)
116 length += strlen(kobject_name(parent)) + 1;
117 parent = parent->parent;
122 static void fill_kobj_path(struct kobject *kobj, char *path, int length)
124 struct kobject *parent;
127 for (parent = kobj; parent; parent = parent->parent) {
128 int cur = strlen(kobject_name(parent));
129 /* back up enough to print this name with '/' */
131 strncpy(path + length, kobject_name(parent), cur);
132 *(path + --length) = '/';
135 pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj),
136 kobj, __func__, path);
140 * kobject_get_path - generate and return the path associated with a given kobj and kset pair.
142 * @kobj: kobject in question, with which to build the path
143 * @gfp_mask: the allocation type used to allocate the path
145 * The result must be freed by the caller with kfree().
147 char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask)
152 len = get_kobj_path_length(kobj);
155 path = kzalloc(len, gfp_mask);
158 fill_kobj_path(kobj, path, len);
162 EXPORT_SYMBOL_GPL(kobject_get_path);
164 /* add the kobject to its kset's list */
165 static void kobj_kset_join(struct kobject *kobj)
170 kset_get(kobj->kset);
171 spin_lock(&kobj->kset->list_lock);
172 list_add_tail(&kobj->entry, &kobj->kset->list);
173 spin_unlock(&kobj->kset->list_lock);
176 /* remove the kobject from its kset's list */
177 static void kobj_kset_leave(struct kobject *kobj)
182 spin_lock(&kobj->kset->list_lock);
183 list_del_init(&kobj->entry);
184 spin_unlock(&kobj->kset->list_lock);
185 kset_put(kobj->kset);
188 static void kobject_init_internal(struct kobject *kobj)
192 kref_init(&kobj->kref);
193 INIT_LIST_HEAD(&kobj->entry);
194 kobj->state_in_sysfs = 0;
195 kobj->state_add_uevent_sent = 0;
196 kobj->state_remove_uevent_sent = 0;
197 kobj->state_initialized = 1;
201 static int kobject_add_internal(struct kobject *kobj)
204 struct kobject *parent;
209 if (!kobj->name || !kobj->name[0]) {
210 WARN(1, "kobject: (%p): attempted to be registered with empty "
215 parent = kobject_get(kobj->parent);
217 /* join kset if set, use it as parent if we do not already have one */
220 parent = kobject_get(&kobj->kset->kobj);
221 kobj_kset_join(kobj);
222 kobj->parent = parent;
225 pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n",
226 kobject_name(kobj), kobj, __func__,
227 parent ? kobject_name(parent) : "<NULL>",
228 kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>");
230 error = create_dir(kobj);
232 kobj_kset_leave(kobj);
236 /* be noisy on error issues */
237 if (error == -EEXIST)
238 WARN(1, "%s failed for %s with "
239 "-EEXIST, don't try to register things with "
240 "the same name in the same directory.\n",
241 __func__, kobject_name(kobj));
243 WARN(1, "%s failed for %s (error: %d parent: %s)\n",
244 __func__, kobject_name(kobj), error,
245 parent ? kobject_name(parent) : "'none'");
247 kobj->state_in_sysfs = 1;
253 * kobject_set_name_vargs - Set the name of an kobject
254 * @kobj: struct kobject to set the name of
255 * @fmt: format string used to build the name
256 * @vargs: vargs to format the string.
258 int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
261 const char *old_name = kobj->name;
264 if (kobj->name && !fmt)
267 kobj->name = kvasprintf(GFP_KERNEL, fmt, vargs);
271 /* ewww... some of these buggers have '/' in the name ... */
272 while ((s = strchr(kobj->name, '/')))
280 * kobject_set_name - Set the name of a kobject
281 * @kobj: struct kobject to set the name of
282 * @fmt: format string used to build the name
284 * This sets the name of the kobject. If you have already added the
285 * kobject to the system, you must call kobject_rename() in order to
286 * change the name of the kobject.
288 int kobject_set_name(struct kobject *kobj, const char *fmt, ...)
293 va_start(vargs, fmt);
294 retval = kobject_set_name_vargs(kobj, fmt, vargs);
299 EXPORT_SYMBOL(kobject_set_name);
302 * kobject_init - initialize a kobject structure
303 * @kobj: pointer to the kobject to initialize
304 * @ktype: pointer to the ktype for this kobject.
306 * This function will properly initialize a kobject such that it can then
307 * be passed to the kobject_add() call.
309 * After this function is called, the kobject MUST be cleaned up by a call
310 * to kobject_put(), not by a call to kfree directly to ensure that all of
311 * the memory is cleaned up properly.
313 void kobject_init(struct kobject *kobj, struct kobj_type *ktype)
318 err_str = "invalid kobject pointer!";
322 err_str = "must have a ktype to be initialized properly!\n";
325 if (kobj->state_initialized) {
326 /* do not error out as sometimes we can recover */
327 printk(KERN_ERR "kobject (%p): tried to init an initialized "
328 "object, something is seriously wrong.\n", kobj);
332 kobject_init_internal(kobj);
337 printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str);
340 EXPORT_SYMBOL(kobject_init);
342 static int kobject_add_varg(struct kobject *kobj, struct kobject *parent,
343 const char *fmt, va_list vargs)
347 retval = kobject_set_name_vargs(kobj, fmt, vargs);
349 printk(KERN_ERR "kobject: can not set name properly!\n");
352 kobj->parent = parent;
353 return kobject_add_internal(kobj);
357 * kobject_add - the main kobject add function
358 * @kobj: the kobject to add
359 * @parent: pointer to the parent of the kobject.
360 * @fmt: format to name the kobject with.
362 * The kobject name is set and added to the kobject hierarchy in this
365 * If @parent is set, then the parent of the @kobj will be set to it.
366 * If @parent is NULL, then the parent of the @kobj will be set to the
367 * kobject associted with the kset assigned to this kobject. If no kset
368 * is assigned to the kobject, then the kobject will be located in the
369 * root of the sysfs tree.
371 * If this function returns an error, kobject_put() must be called to
372 * properly clean up the memory associated with the object.
373 * Under no instance should the kobject that is passed to this function
374 * be directly freed with a call to kfree(), that can leak memory.
376 * Note, no "add" uevent will be created with this call, the caller should set
377 * up all of the necessary sysfs files for the object and then call
378 * kobject_uevent() with the UEVENT_ADD parameter to ensure that
379 * userspace is properly notified of this kobject's creation.
381 int kobject_add(struct kobject *kobj, struct kobject *parent,
382 const char *fmt, ...)
390 if (!kobj->state_initialized) {
391 printk(KERN_ERR "kobject '%s' (%p): tried to add an "
392 "uninitialized object, something is seriously wrong.\n",
393 kobject_name(kobj), kobj);
398 retval = kobject_add_varg(kobj, parent, fmt, args);
403 EXPORT_SYMBOL(kobject_add);
406 * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy
407 * @kobj: pointer to the kobject to initialize
408 * @ktype: pointer to the ktype for this kobject.
409 * @parent: pointer to the parent of this kobject.
410 * @fmt: the name of the kobject.
412 * This function combines the call to kobject_init() and
413 * kobject_add(). The same type of error handling after a call to
414 * kobject_add() and kobject lifetime rules are the same here.
416 int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
417 struct kobject *parent, const char *fmt, ...)
422 kobject_init(kobj, ktype);
425 retval = kobject_add_varg(kobj, parent, fmt, args);
430 EXPORT_SYMBOL_GPL(kobject_init_and_add);
433 * kobject_rename - change the name of an object
434 * @kobj: object in question.
435 * @new_name: object's new name
437 * It is the responsibility of the caller to provide mutual
438 * exclusion between two different calls of kobject_rename
439 * on the same kobject and to ensure that new_name is valid and
440 * won't conflict with other kobjects.
442 int kobject_rename(struct kobject *kobj, const char *new_name)
445 const char *devpath = NULL;
446 const char *dup_name = NULL, *name;
447 char *devpath_string = NULL;
450 kobj = kobject_get(kobj);
456 devpath = kobject_get_path(kobj, GFP_KERNEL);
461 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
462 if (!devpath_string) {
466 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
467 envp[0] = devpath_string;
470 name = dup_name = kstrdup(new_name, GFP_KERNEL);
476 error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj));
480 /* Install the new kobject name */
481 dup_name = kobj->name;
484 /* This function is mostly/only used for network interface.
485 * Some hotplug package track interfaces by their name and
486 * therefore want to know when the name is changed by the user. */
487 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
491 kfree(devpath_string);
497 EXPORT_SYMBOL_GPL(kobject_rename);
500 * kobject_move - move object to another parent
501 * @kobj: object in question.
502 * @new_parent: object's new parent (can be NULL)
504 int kobject_move(struct kobject *kobj, struct kobject *new_parent)
507 struct kobject *old_parent;
508 const char *devpath = NULL;
509 char *devpath_string = NULL;
512 kobj = kobject_get(kobj);
515 new_parent = kobject_get(new_parent);
518 new_parent = kobject_get(&kobj->kset->kobj);
521 /* old object path */
522 devpath = kobject_get_path(kobj, GFP_KERNEL);
527 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
528 if (!devpath_string) {
532 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
533 envp[0] = devpath_string;
535 error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj));
538 old_parent = kobj->parent;
539 kobj->parent = new_parent;
541 kobject_put(old_parent);
542 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
544 kobject_put(new_parent);
546 kfree(devpath_string);
552 * kobject_del - unlink kobject from hierarchy.
555 void kobject_del(struct kobject *kobj)
557 struct sysfs_dirent *sd;
563 sysfs_remove_dir(kobj);
566 kobj->state_in_sysfs = 0;
567 kobj_kset_leave(kobj);
568 kobject_put(kobj->parent);
573 * kobject_get - increment refcount for object.
576 struct kobject *kobject_get(struct kobject *kobj)
579 kref_get(&kobj->kref);
583 static struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj)
585 if (!kref_get_unless_zero(&kobj->kref))
591 * kobject_cleanup - free kobject resources.
592 * @kobj: object to cleanup
594 static void kobject_cleanup(struct kobject *kobj)
596 struct kobj_type *t = get_ktype(kobj);
597 const char *name = kobj->name;
599 pr_debug("kobject: '%s' (%p): %s, parent %p\n",
600 kobject_name(kobj), kobj, __func__, kobj->parent);
602 if (t && !t->release)
603 pr_debug("kobject: '%s' (%p): does not have a release() "
604 "function, it is broken and must be fixed.\n",
605 kobject_name(kobj), kobj);
607 /* send "remove" if the caller did not do it but sent "add" */
608 if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) {
609 pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n",
610 kobject_name(kobj), kobj);
611 kobject_uevent(kobj, KOBJ_REMOVE);
614 /* remove from sysfs if the caller did not do it */
615 if (kobj->state_in_sysfs) {
616 pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n",
617 kobject_name(kobj), kobj);
621 if (t && t->release) {
622 pr_debug("kobject: '%s' (%p): calling ktype release\n",
623 kobject_name(kobj), kobj);
627 /* free name if we allocated it */
629 pr_debug("kobject: '%s': free name\n", name);
634 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
635 static void kobject_delayed_cleanup(struct work_struct *work)
637 kobject_cleanup(container_of(to_delayed_work(work),
638 struct kobject, release));
642 static void kobject_release(struct kref *kref)
644 struct kobject *kobj = container_of(kref, struct kobject, kref);
645 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
646 unsigned long delay = HZ + HZ * (get_random_int() & 0x3);
647 pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n",
648 kobject_name(kobj), kobj, __func__, kobj->parent, delay);
649 INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup);
651 schedule_delayed_work(&kobj->release, delay);
653 kobject_cleanup(kobj);
658 * kobject_put - decrement refcount for object.
661 * Decrement the refcount, and if 0, call kobject_cleanup().
663 void kobject_put(struct kobject *kobj)
666 if (!kobj->state_initialized)
667 WARN(1, KERN_WARNING "kobject: '%s' (%p): is not "
668 "initialized, yet kobject_put() is being "
669 "called.\n", kobject_name(kobj), kobj);
670 kref_put(&kobj->kref, kobject_release);
674 static void dynamic_kobj_release(struct kobject *kobj)
676 pr_debug("kobject: (%p): %s\n", kobj, __func__);
680 static struct kobj_type dynamic_kobj_ktype = {
681 .release = dynamic_kobj_release,
682 .sysfs_ops = &kobj_sysfs_ops,
686 * kobject_create - create a struct kobject dynamically
688 * This function creates a kobject structure dynamically and sets it up
689 * to be a "dynamic" kobject with a default release function set up.
691 * If the kobject was not able to be created, NULL will be returned.
692 * The kobject structure returned from here must be cleaned up with a
693 * call to kobject_put() and not kfree(), as kobject_init() has
694 * already been called on this structure.
696 struct kobject *kobject_create(void)
698 struct kobject *kobj;
700 kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
704 kobject_init(kobj, &dynamic_kobj_ktype);
709 * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs
711 * @name: the name for the kobject
712 * @parent: the parent kobject of this kobject, if any.
714 * This function creates a kobject structure dynamically and registers it
715 * with sysfs. When you are finished with this structure, call
716 * kobject_put() and the structure will be dynamically freed when
717 * it is no longer being used.
719 * If the kobject was not able to be created, NULL will be returned.
721 struct kobject *kobject_create_and_add(const char *name, struct kobject *parent)
723 struct kobject *kobj;
726 kobj = kobject_create();
730 retval = kobject_add(kobj, parent, "%s", name);
732 printk(KERN_WARNING "%s: kobject_add error: %d\n",
739 EXPORT_SYMBOL_GPL(kobject_create_and_add);
742 * kset_init - initialize a kset for use
745 void kset_init(struct kset *k)
747 kobject_init_internal(&k->kobj);
748 INIT_LIST_HEAD(&k->list);
749 spin_lock_init(&k->list_lock);
752 /* default kobject attribute operations */
753 static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr,
756 struct kobj_attribute *kattr;
759 kattr = container_of(attr, struct kobj_attribute, attr);
761 ret = kattr->show(kobj, kattr, buf);
765 static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr,
766 const char *buf, size_t count)
768 struct kobj_attribute *kattr;
771 kattr = container_of(attr, struct kobj_attribute, attr);
773 ret = kattr->store(kobj, kattr, buf, count);
777 const struct sysfs_ops kobj_sysfs_ops = {
778 .show = kobj_attr_show,
779 .store = kobj_attr_store,
783 * kobj_completion_init - initialize a kobj_completion object.
784 * @kc: kobj_completion
785 * @ktype: type of kobject to initialize
787 * kobj_completion structures can be embedded within structures with different
788 * lifetime rules. During the release of the enclosing object, we can
789 * wait on the release of the kobject so that we don't free it while it's
792 void kobj_completion_init(struct kobj_completion *kc, struct kobj_type *ktype)
794 init_completion(&kc->kc_unregister);
795 kobject_init(&kc->kc_kobj, ktype);
797 EXPORT_SYMBOL_GPL(kobj_completion_init);
800 * kobj_completion_release - release a kobj_completion object
801 * @kobj: kobject embedded in kobj_completion
803 * Used with kobject_release to notify waiters that the kobject has been
806 void kobj_completion_release(struct kobject *kobj)
808 struct kobj_completion *kc = kobj_to_kobj_completion(kobj);
809 complete(&kc->kc_unregister);
811 EXPORT_SYMBOL_GPL(kobj_completion_release);
814 * kobj_completion_del_and_wait - release the kobject and wait for it
815 * @kc: kobj_completion object to release
817 * Delete the kobject from sysfs and drop the reference count. Then wait
818 * until any other outstanding references are also dropped. This routine
819 * is only necessary once other references may have been taken on the
820 * kobject. Typically this happens when the kobject has been published
821 * to sysfs via kobject_add.
823 void kobj_completion_del_and_wait(struct kobj_completion *kc)
825 kobject_del(&kc->kc_kobj);
826 kobject_put(&kc->kc_kobj);
827 wait_for_completion(&kc->kc_unregister);
829 EXPORT_SYMBOL_GPL(kobj_completion_del_and_wait);
832 * kset_register - initialize and add a kset.
835 int kset_register(struct kset *k)
843 err = kobject_add_internal(&k->kobj);
846 kobject_uevent(&k->kobj, KOBJ_ADD);
851 * kset_unregister - remove a kset.
854 void kset_unregister(struct kset *k)
858 kobject_del(&k->kobj);
859 kobject_put(&k->kobj);
863 * kset_find_obj - search for object in kset.
864 * @kset: kset we're looking in.
865 * @name: object's name.
867 * Lock kset via @kset->subsys, and iterate over @kset->list,
868 * looking for a matching kobject. If matching object is found
869 * take a reference and return the object.
871 struct kobject *kset_find_obj(struct kset *kset, const char *name)
874 struct kobject *ret = NULL;
876 spin_lock(&kset->list_lock);
878 list_for_each_entry(k, &kset->list, entry) {
879 if (kobject_name(k) && !strcmp(kobject_name(k), name)) {
880 ret = kobject_get_unless_zero(k);
885 spin_unlock(&kset->list_lock);
889 static void kset_release(struct kobject *kobj)
891 struct kset *kset = container_of(kobj, struct kset, kobj);
892 pr_debug("kobject: '%s' (%p): %s\n",
893 kobject_name(kobj), kobj, __func__);
897 static struct kobj_type kset_ktype = {
898 .sysfs_ops = &kobj_sysfs_ops,
899 .release = kset_release,
903 * kset_create - create a struct kset dynamically
905 * @name: the name for the kset
906 * @uevent_ops: a struct kset_uevent_ops for the kset
907 * @parent_kobj: the parent kobject of this kset, if any.
909 * This function creates a kset structure dynamically. This structure can
910 * then be registered with the system and show up in sysfs with a call to
911 * kset_register(). When you are finished with this structure, if
912 * kset_register() has been called, call kset_unregister() and the
913 * structure will be dynamically freed when it is no longer being used.
915 * If the kset was not able to be created, NULL will be returned.
917 static struct kset *kset_create(const char *name,
918 const struct kset_uevent_ops *uevent_ops,
919 struct kobject *parent_kobj)
924 kset = kzalloc(sizeof(*kset), GFP_KERNEL);
927 retval = kobject_set_name(&kset->kobj, "%s", name);
932 kset->uevent_ops = uevent_ops;
933 kset->kobj.parent = parent_kobj;
936 * The kobject of this kset will have a type of kset_ktype and belong to
937 * no kset itself. That way we can properly free it when it is
938 * finished being used.
940 kset->kobj.ktype = &kset_ktype;
941 kset->kobj.kset = NULL;
947 * kset_create_and_add - create a struct kset dynamically and add it to sysfs
949 * @name: the name for the kset
950 * @uevent_ops: a struct kset_uevent_ops for the kset
951 * @parent_kobj: the parent kobject of this kset, if any.
953 * This function creates a kset structure dynamically and registers it
954 * with sysfs. When you are finished with this structure, call
955 * kset_unregister() and the structure will be dynamically freed when it
956 * is no longer being used.
958 * If the kset was not able to be created, NULL will be returned.
960 struct kset *kset_create_and_add(const char *name,
961 const struct kset_uevent_ops *uevent_ops,
962 struct kobject *parent_kobj)
967 kset = kset_create(name, uevent_ops, parent_kobj);
970 error = kset_register(kset);
977 EXPORT_SYMBOL_GPL(kset_create_and_add);
980 static DEFINE_SPINLOCK(kobj_ns_type_lock);
981 static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES];
983 int kobj_ns_type_register(const struct kobj_ns_type_operations *ops)
985 enum kobj_ns_type type = ops->type;
988 spin_lock(&kobj_ns_type_lock);
991 if (type >= KOBJ_NS_TYPES)
995 if (type <= KOBJ_NS_TYPE_NONE)
999 if (kobj_ns_ops_tbl[type])
1003 kobj_ns_ops_tbl[type] = ops;
1006 spin_unlock(&kobj_ns_type_lock);
1010 int kobj_ns_type_registered(enum kobj_ns_type type)
1014 spin_lock(&kobj_ns_type_lock);
1015 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES))
1016 registered = kobj_ns_ops_tbl[type] != NULL;
1017 spin_unlock(&kobj_ns_type_lock);
1022 const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent)
1024 const struct kobj_ns_type_operations *ops = NULL;
1026 if (parent && parent->ktype->child_ns_type)
1027 ops = parent->ktype->child_ns_type(parent);
1032 const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj)
1034 return kobj_child_ns_ops(kobj->parent);
1037 bool kobj_ns_current_may_mount(enum kobj_ns_type type)
1039 bool may_mount = true;
1041 spin_lock(&kobj_ns_type_lock);
1042 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1043 kobj_ns_ops_tbl[type])
1044 may_mount = kobj_ns_ops_tbl[type]->current_may_mount();
1045 spin_unlock(&kobj_ns_type_lock);
1050 void *kobj_ns_grab_current(enum kobj_ns_type type)
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 ns = kobj_ns_ops_tbl[type]->grab_current_ns();
1058 spin_unlock(&kobj_ns_type_lock);
1063 const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk)
1065 const void *ns = NULL;
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]->netlink_ns(sk);
1071 spin_unlock(&kobj_ns_type_lock);
1076 const void *kobj_ns_initial(enum kobj_ns_type type)
1078 const void *ns = NULL;
1080 spin_lock(&kobj_ns_type_lock);
1081 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1082 kobj_ns_ops_tbl[type])
1083 ns = kobj_ns_ops_tbl[type]->initial_ns();
1084 spin_unlock(&kobj_ns_type_lock);
1089 void kobj_ns_drop(enum kobj_ns_type type, void *ns)
1091 spin_lock(&kobj_ns_type_lock);
1092 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1093 kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns)
1094 kobj_ns_ops_tbl[type]->drop_ns(ns);
1095 spin_unlock(&kobj_ns_type_lock);
1098 EXPORT_SYMBOL(kobject_get);
1099 EXPORT_SYMBOL(kobject_put);
1100 EXPORT_SYMBOL(kobject_del);
1102 EXPORT_SYMBOL(kset_register);
1103 EXPORT_SYMBOL(kset_unregister);