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/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(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 * populate_dir - populate directory with attributes.
42 * @kobj: object we're working on.
44 * Most subsystems have a set of default attributes that are associated
45 * with an object that registers with them. This is a helper called during
46 * object registration that loops through the default attributes of the
47 * subsystem and creates attributes files for them in sysfs.
49 static int populate_dir(struct kobject *kobj)
51 struct kobj_type *t = get_ktype(kobj);
52 struct attribute *attr;
56 if (t && t->default_attrs) {
57 for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) {
58 error = sysfs_create_file(kobj, attr);
66 static int create_dir(struct kobject *kobj)
68 const struct kobj_ns_type_operations *ops;
71 error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj));
75 error = populate_dir(kobj);
77 sysfs_remove_dir(kobj);
82 * @kobj->sd may be deleted by an ancestor going away. Hold an
83 * extra reference so that it stays until @kobj is gone.
88 * If @kobj has ns_ops, its children need to be filtered based on
89 * their namespace tags. Enable namespace support on @kobj->sd.
91 ops = kobj_child_ns_ops(kobj);
93 BUG_ON(ops->type <= KOBJ_NS_TYPE_NONE);
94 BUG_ON(ops->type >= KOBJ_NS_TYPES);
95 BUG_ON(!kobj_ns_type_registered(ops->type));
97 sysfs_enable_ns(kobj->sd);
103 static int get_kobj_path_length(struct kobject *kobj)
106 struct kobject *parent = kobj;
108 /* walk up the ancestors until we hit the one pointing to the
110 * Add 1 to strlen for leading '/' of each level.
113 if (kobject_name(parent) == NULL)
115 length += strlen(kobject_name(parent)) + 1;
116 parent = parent->parent;
121 static void fill_kobj_path(struct kobject *kobj, char *path, int length)
123 struct kobject *parent;
126 for (parent = kobj; parent; parent = parent->parent) {
127 int cur = strlen(kobject_name(parent));
128 /* back up enough to print this name with '/' */
130 memcpy(path + length, kobject_name(parent), cur);
131 *(path + --length) = '/';
134 pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj),
135 kobj, __func__, path);
139 * kobject_get_path - generate and return the path associated with a given kobj and kset pair.
141 * @kobj: kobject in question, with which to build the path
142 * @gfp_mask: the allocation type used to allocate the path
144 * The result must be freed by the caller with kfree().
146 char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask)
151 len = get_kobj_path_length(kobj);
154 path = kzalloc(len, gfp_mask);
157 fill_kobj_path(kobj, path, len);
161 EXPORT_SYMBOL_GPL(kobject_get_path);
163 /* add the kobject to its kset's list */
164 static void kobj_kset_join(struct kobject *kobj)
169 kset_get(kobj->kset);
170 spin_lock(&kobj->kset->list_lock);
171 list_add_tail(&kobj->entry, &kobj->kset->list);
172 spin_unlock(&kobj->kset->list_lock);
175 /* remove the kobject from its kset's list */
176 static void kobj_kset_leave(struct kobject *kobj)
181 spin_lock(&kobj->kset->list_lock);
182 list_del_init(&kobj->entry);
183 spin_unlock(&kobj->kset->list_lock);
184 kset_put(kobj->kset);
187 static void kobject_init_internal(struct kobject *kobj)
191 kref_init(&kobj->kref);
192 INIT_LIST_HEAD(&kobj->entry);
193 kobj->state_in_sysfs = 0;
194 kobj->state_add_uevent_sent = 0;
195 kobj->state_remove_uevent_sent = 0;
196 kobj->state_initialized = 1;
200 static int kobject_add_internal(struct kobject *kobj)
203 struct kobject *parent;
208 if (!kobj->name || !kobj->name[0]) {
209 WARN(1, "kobject: (%p): attempted to be registered with empty "
214 parent = kobject_get(kobj->parent);
216 /* join kset if set, use it as parent if we do not already have one */
219 parent = kobject_get(&kobj->kset->kobj);
220 kobj_kset_join(kobj);
221 kobj->parent = parent;
224 pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n",
225 kobject_name(kobj), kobj, __func__,
226 parent ? kobject_name(parent) : "<NULL>",
227 kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>");
229 error = create_dir(kobj);
231 kobj_kset_leave(kobj);
235 /* be noisy on error issues */
236 if (error == -EEXIST)
237 pr_err("%s failed for %s with -EEXIST, don't try to register things with the same name in the same directory.\n",
238 __func__, kobject_name(kobj));
240 pr_err("%s failed for %s (error: %d parent: %s)\n",
241 __func__, kobject_name(kobj), error,
242 parent ? kobject_name(parent) : "'none'");
244 kobj->state_in_sysfs = 1;
250 * kobject_set_name_vargs - Set the name of an kobject
251 * @kobj: struct kobject to set the name of
252 * @fmt: format string used to build the name
253 * @vargs: vargs to format the string.
255 int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
260 if (kobj->name && !fmt)
263 s = kvasprintf_const(GFP_KERNEL, fmt, vargs);
268 * ewww... some of these buggers have '/' in the name ... If
269 * that's the case, we need to make sure we have an actual
270 * allocated copy to modify, since kvasprintf_const may have
271 * returned something from .rodata.
273 if (strchr(s, '/')) {
276 t = kstrdup(s, GFP_KERNEL);
280 strreplace(t, '/', '!');
283 kfree_const(kobj->name);
290 * kobject_set_name - Set the name of a kobject
291 * @kobj: struct kobject to set the name of
292 * @fmt: format string used to build the name
294 * This sets the name of the kobject. If you have already added the
295 * kobject to the system, you must call kobject_rename() in order to
296 * change the name of the kobject.
298 int kobject_set_name(struct kobject *kobj, const char *fmt, ...)
303 va_start(vargs, fmt);
304 retval = kobject_set_name_vargs(kobj, fmt, vargs);
309 EXPORT_SYMBOL(kobject_set_name);
312 * kobject_init - initialize a kobject structure
313 * @kobj: pointer to the kobject to initialize
314 * @ktype: pointer to the ktype for this kobject.
316 * This function will properly initialize a kobject such that it can then
317 * be passed to the kobject_add() call.
319 * After this function is called, the kobject MUST be cleaned up by a call
320 * to kobject_put(), not by a call to kfree directly to ensure that all of
321 * the memory is cleaned up properly.
323 void kobject_init(struct kobject *kobj, struct kobj_type *ktype)
328 err_str = "invalid kobject pointer!";
332 err_str = "must have a ktype to be initialized properly!\n";
335 if (kobj->state_initialized) {
336 /* do not error out as sometimes we can recover */
337 printk(KERN_ERR "kobject (%p): tried to init an initialized "
338 "object, something is seriously wrong.\n", kobj);
342 kobject_init_internal(kobj);
347 printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str);
350 EXPORT_SYMBOL(kobject_init);
352 static __printf(3, 0) int kobject_add_varg(struct kobject *kobj,
353 struct kobject *parent,
354 const char *fmt, va_list vargs)
358 retval = kobject_set_name_vargs(kobj, fmt, vargs);
360 printk(KERN_ERR "kobject: can not set name properly!\n");
363 kobj->parent = parent;
364 return kobject_add_internal(kobj);
368 * kobject_add - the main kobject add function
369 * @kobj: the kobject to add
370 * @parent: pointer to the parent of the kobject.
371 * @fmt: format to name the kobject with.
373 * The kobject name is set and added to the kobject hierarchy in this
376 * If @parent is set, then the parent of the @kobj will be set to it.
377 * If @parent is NULL, then the parent of the @kobj will be set to the
378 * kobject associated with the kset assigned to this kobject. If no kset
379 * is assigned to the kobject, then the kobject will be located in the
380 * root of the sysfs tree.
382 * If this function returns an error, kobject_put() must be called to
383 * properly clean up the memory associated with the object.
384 * Under no instance should the kobject that is passed to this function
385 * be directly freed with a call to kfree(), that can leak memory.
387 * Note, no "add" uevent will be created with this call, the caller should set
388 * up all of the necessary sysfs files for the object and then call
389 * kobject_uevent() with the UEVENT_ADD parameter to ensure that
390 * userspace is properly notified of this kobject's creation.
392 int kobject_add(struct kobject *kobj, struct kobject *parent,
393 const char *fmt, ...)
401 if (!kobj->state_initialized) {
402 printk(KERN_ERR "kobject '%s' (%p): tried to add an "
403 "uninitialized object, something is seriously wrong.\n",
404 kobject_name(kobj), kobj);
409 retval = kobject_add_varg(kobj, parent, fmt, args);
414 EXPORT_SYMBOL(kobject_add);
417 * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy
418 * @kobj: pointer to the kobject to initialize
419 * @ktype: pointer to the ktype for this kobject.
420 * @parent: pointer to the parent of this kobject.
421 * @fmt: the name of the kobject.
423 * This function combines the call to kobject_init() and
424 * kobject_add(). The same type of error handling after a call to
425 * kobject_add() and kobject lifetime rules are the same here.
427 int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
428 struct kobject *parent, const char *fmt, ...)
433 kobject_init(kobj, ktype);
436 retval = kobject_add_varg(kobj, parent, fmt, args);
441 EXPORT_SYMBOL_GPL(kobject_init_and_add);
444 * kobject_rename - change the name of an object
445 * @kobj: object in question.
446 * @new_name: object's new name
448 * It is the responsibility of the caller to provide mutual
449 * exclusion between two different calls of kobject_rename
450 * on the same kobject and to ensure that new_name is valid and
451 * won't conflict with other kobjects.
453 int kobject_rename(struct kobject *kobj, const char *new_name)
456 const char *devpath = NULL;
457 const char *dup_name = NULL, *name;
458 char *devpath_string = NULL;
461 kobj = kobject_get(kobj);
467 devpath = kobject_get_path(kobj, GFP_KERNEL);
472 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
473 if (!devpath_string) {
477 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
478 envp[0] = devpath_string;
481 name = dup_name = kstrdup_const(new_name, GFP_KERNEL);
487 error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj));
491 /* Install the new kobject name */
492 dup_name = kobj->name;
495 /* This function is mostly/only used for network interface.
496 * Some hotplug package track interfaces by their name and
497 * therefore want to know when the name is changed by the user. */
498 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
501 kfree_const(dup_name);
502 kfree(devpath_string);
508 EXPORT_SYMBOL_GPL(kobject_rename);
511 * kobject_move - move object to another parent
512 * @kobj: object in question.
513 * @new_parent: object's new parent (can be NULL)
515 int kobject_move(struct kobject *kobj, struct kobject *new_parent)
518 struct kobject *old_parent;
519 const char *devpath = NULL;
520 char *devpath_string = NULL;
523 kobj = kobject_get(kobj);
526 new_parent = kobject_get(new_parent);
529 new_parent = kobject_get(&kobj->kset->kobj);
532 /* old object path */
533 devpath = kobject_get_path(kobj, GFP_KERNEL);
538 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
539 if (!devpath_string) {
543 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
544 envp[0] = devpath_string;
546 error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj));
549 old_parent = kobj->parent;
550 kobj->parent = new_parent;
552 kobject_put(old_parent);
553 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
555 kobject_put(new_parent);
557 kfree(devpath_string);
561 EXPORT_SYMBOL_GPL(kobject_move);
564 * kobject_del - unlink kobject from hierarchy.
567 void kobject_del(struct kobject *kobj)
569 struct kernfs_node *sd;
575 sysfs_remove_dir(kobj);
578 kobj->state_in_sysfs = 0;
579 kobj_kset_leave(kobj);
580 kobject_put(kobj->parent);
583 EXPORT_SYMBOL(kobject_del);
586 * kobject_get - increment refcount for object.
589 struct kobject *kobject_get(struct kobject *kobj)
592 if (!kobj->state_initialized)
593 WARN(1, KERN_WARNING "kobject: '%s' (%p): is not "
594 "initialized, yet kobject_get() is being "
595 "called.\n", kobject_name(kobj), kobj);
596 kref_get(&kobj->kref);
600 EXPORT_SYMBOL(kobject_get);
602 static struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj)
604 if (!kref_get_unless_zero(&kobj->kref))
610 * kobject_cleanup - free kobject resources.
611 * @kobj: object to cleanup
613 static void kobject_cleanup(struct kobject *kobj)
615 struct kobj_type *t = get_ktype(kobj);
616 const char *name = kobj->name;
618 pr_debug("kobject: '%s' (%p): %s, parent %p\n",
619 kobject_name(kobj), kobj, __func__, kobj->parent);
621 if (t && !t->release)
622 pr_debug("kobject: '%s' (%p): does not have a release() "
623 "function, it is broken and must be fixed.\n",
624 kobject_name(kobj), kobj);
626 /* send "remove" if the caller did not do it but sent "add" */
627 if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) {
628 pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n",
629 kobject_name(kobj), kobj);
630 kobject_uevent(kobj, KOBJ_REMOVE);
633 /* remove from sysfs if the caller did not do it */
634 if (kobj->state_in_sysfs) {
635 pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n",
636 kobject_name(kobj), kobj);
640 if (t && t->release) {
641 pr_debug("kobject: '%s' (%p): calling ktype release\n",
642 kobject_name(kobj), kobj);
646 /* free name if we allocated it */
648 pr_debug("kobject: '%s': free name\n", name);
653 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
654 static void kobject_delayed_cleanup(struct work_struct *work)
656 kobject_cleanup(container_of(to_delayed_work(work),
657 struct kobject, release));
661 static void kobject_release(struct kref *kref)
663 struct kobject *kobj = container_of(kref, struct kobject, kref);
664 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
665 unsigned long delay = HZ + HZ * (get_random_int() & 0x3);
666 pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n",
667 kobject_name(kobj), kobj, __func__, kobj->parent, delay);
668 INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup);
670 schedule_delayed_work(&kobj->release, delay);
672 kobject_cleanup(kobj);
677 * kobject_put - decrement refcount for object.
680 * Decrement the refcount, and if 0, call kobject_cleanup().
682 void kobject_put(struct kobject *kobj)
685 if (!kobj->state_initialized)
686 WARN(1, KERN_WARNING "kobject: '%s' (%p): is not "
687 "initialized, yet kobject_put() is being "
688 "called.\n", kobject_name(kobj), kobj);
689 kref_put(&kobj->kref, kobject_release);
692 EXPORT_SYMBOL(kobject_put);
694 static void dynamic_kobj_release(struct kobject *kobj)
696 pr_debug("kobject: (%p): %s\n", kobj, __func__);
700 static struct kobj_type dynamic_kobj_ktype = {
701 .release = dynamic_kobj_release,
702 .sysfs_ops = &kobj_sysfs_ops,
706 * kobject_create - create a struct kobject dynamically
708 * This function creates a kobject structure dynamically and sets it up
709 * to be a "dynamic" kobject with a default release function set up.
711 * If the kobject was not able to be created, NULL will be returned.
712 * The kobject structure returned from here must be cleaned up with a
713 * call to kobject_put() and not kfree(), as kobject_init() has
714 * already been called on this structure.
716 struct kobject *kobject_create(void)
718 struct kobject *kobj;
720 kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
724 kobject_init(kobj, &dynamic_kobj_ktype);
729 * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs
731 * @name: the name for the kobject
732 * @parent: the parent kobject of this kobject, if any.
734 * This function creates a kobject structure dynamically and registers it
735 * with sysfs. When you are finished with this structure, call
736 * kobject_put() and the structure will be dynamically freed when
737 * it is no longer being used.
739 * If the kobject was not able to be created, NULL will be returned.
741 struct kobject *kobject_create_and_add(const char *name, struct kobject *parent)
743 struct kobject *kobj;
746 kobj = kobject_create();
750 retval = kobject_add(kobj, parent, "%s", name);
752 printk(KERN_WARNING "%s: kobject_add error: %d\n",
759 EXPORT_SYMBOL_GPL(kobject_create_and_add);
762 * kset_init - initialize a kset for use
765 void kset_init(struct kset *k)
767 kobject_init_internal(&k->kobj);
768 INIT_LIST_HEAD(&k->list);
769 spin_lock_init(&k->list_lock);
772 /* default kobject attribute operations */
773 static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr,
776 struct kobj_attribute *kattr;
779 kattr = container_of(attr, struct kobj_attribute, attr);
781 ret = kattr->show(kobj, kattr, buf);
785 static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr,
786 const char *buf, size_t count)
788 struct kobj_attribute *kattr;
791 kattr = container_of(attr, struct kobj_attribute, attr);
793 ret = kattr->store(kobj, kattr, buf, count);
797 const struct sysfs_ops kobj_sysfs_ops = {
798 .show = kobj_attr_show,
799 .store = kobj_attr_store,
801 EXPORT_SYMBOL_GPL(kobj_sysfs_ops);
804 * kset_register - initialize and add a kset.
807 int kset_register(struct kset *k)
815 err = kobject_add_internal(&k->kobj);
818 kobject_uevent(&k->kobj, KOBJ_ADD);
821 EXPORT_SYMBOL(kset_register);
824 * kset_unregister - remove a kset.
827 void kset_unregister(struct kset *k)
831 kobject_del(&k->kobj);
832 kobject_put(&k->kobj);
834 EXPORT_SYMBOL(kset_unregister);
837 * kset_find_obj - search for object in kset.
838 * @kset: kset we're looking in.
839 * @name: object's name.
841 * Lock kset via @kset->subsys, and iterate over @kset->list,
842 * looking for a matching kobject. If matching object is found
843 * take a reference and return the object.
845 struct kobject *kset_find_obj(struct kset *kset, const char *name)
848 struct kobject *ret = NULL;
850 spin_lock(&kset->list_lock);
852 list_for_each_entry(k, &kset->list, entry) {
853 if (kobject_name(k) && !strcmp(kobject_name(k), name)) {
854 ret = kobject_get_unless_zero(k);
859 spin_unlock(&kset->list_lock);
863 static void kset_release(struct kobject *kobj)
865 struct kset *kset = container_of(kobj, struct kset, kobj);
866 pr_debug("kobject: '%s' (%p): %s\n",
867 kobject_name(kobj), kobj, __func__);
871 static struct kobj_type kset_ktype = {
872 .sysfs_ops = &kobj_sysfs_ops,
873 .release = kset_release,
877 * kset_create - create a struct kset dynamically
879 * @name: the name for the kset
880 * @uevent_ops: a struct kset_uevent_ops for the kset
881 * @parent_kobj: the parent kobject of this kset, if any.
883 * This function creates a kset structure dynamically. This structure can
884 * then be registered with the system and show up in sysfs with a call to
885 * kset_register(). When you are finished with this structure, if
886 * kset_register() has been called, call kset_unregister() and the
887 * structure will be dynamically freed when it is no longer being used.
889 * If the kset was not able to be created, NULL will be returned.
891 static struct kset *kset_create(const char *name,
892 const struct kset_uevent_ops *uevent_ops,
893 struct kobject *parent_kobj)
898 kset = kzalloc(sizeof(*kset), GFP_KERNEL);
901 retval = kobject_set_name(&kset->kobj, "%s", name);
906 kset->uevent_ops = uevent_ops;
907 kset->kobj.parent = parent_kobj;
910 * The kobject of this kset will have a type of kset_ktype and belong to
911 * no kset itself. That way we can properly free it when it is
912 * finished being used.
914 kset->kobj.ktype = &kset_ktype;
915 kset->kobj.kset = NULL;
921 * kset_create_and_add - create a struct kset dynamically and add it to sysfs
923 * @name: the name for the kset
924 * @uevent_ops: a struct kset_uevent_ops for the kset
925 * @parent_kobj: the parent kobject of this kset, if any.
927 * This function creates a kset structure dynamically and registers it
928 * with sysfs. When you are finished with this structure, call
929 * kset_unregister() and the structure will be dynamically freed when it
930 * is no longer being used.
932 * If the kset was not able to be created, NULL will be returned.
934 struct kset *kset_create_and_add(const char *name,
935 const struct kset_uevent_ops *uevent_ops,
936 struct kobject *parent_kobj)
941 kset = kset_create(name, uevent_ops, parent_kobj);
944 error = kset_register(kset);
951 EXPORT_SYMBOL_GPL(kset_create_and_add);
954 static DEFINE_SPINLOCK(kobj_ns_type_lock);
955 static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES];
957 int kobj_ns_type_register(const struct kobj_ns_type_operations *ops)
959 enum kobj_ns_type type = ops->type;
962 spin_lock(&kobj_ns_type_lock);
965 if (type >= KOBJ_NS_TYPES)
969 if (type <= KOBJ_NS_TYPE_NONE)
973 if (kobj_ns_ops_tbl[type])
977 kobj_ns_ops_tbl[type] = ops;
980 spin_unlock(&kobj_ns_type_lock);
984 int kobj_ns_type_registered(enum kobj_ns_type type)
988 spin_lock(&kobj_ns_type_lock);
989 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES))
990 registered = kobj_ns_ops_tbl[type] != NULL;
991 spin_unlock(&kobj_ns_type_lock);
996 const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent)
998 const struct kobj_ns_type_operations *ops = NULL;
1000 if (parent && parent->ktype && parent->ktype->child_ns_type)
1001 ops = parent->ktype->child_ns_type(parent);
1006 const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj)
1008 return kobj_child_ns_ops(kobj->parent);
1011 bool kobj_ns_current_may_mount(enum kobj_ns_type type)
1013 bool may_mount = true;
1015 spin_lock(&kobj_ns_type_lock);
1016 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1017 kobj_ns_ops_tbl[type])
1018 may_mount = kobj_ns_ops_tbl[type]->current_may_mount();
1019 spin_unlock(&kobj_ns_type_lock);
1024 void *kobj_ns_grab_current(enum kobj_ns_type type)
1028 spin_lock(&kobj_ns_type_lock);
1029 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1030 kobj_ns_ops_tbl[type])
1031 ns = kobj_ns_ops_tbl[type]->grab_current_ns();
1032 spin_unlock(&kobj_ns_type_lock);
1037 const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk)
1039 const void *ns = NULL;
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 ns = kobj_ns_ops_tbl[type]->netlink_ns(sk);
1045 spin_unlock(&kobj_ns_type_lock);
1050 const void *kobj_ns_initial(enum kobj_ns_type type)
1052 const void *ns = NULL;
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]->initial_ns();
1058 spin_unlock(&kobj_ns_type_lock);
1063 void kobj_ns_drop(enum kobj_ns_type type, void *ns)
1065 spin_lock(&kobj_ns_type_lock);
1066 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1067 kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns)
1068 kobj_ns_ops_tbl[type]->drop_ns(ns);
1069 spin_unlock(&kobj_ns_type_lock);