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 kernfs_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 strncpy(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 WARN(1, "%s failed for %s with "
238 "-EEXIST, don't try to register things with "
239 "the same name in the same directory.\n",
240 __func__
, kobject_name(kobj
));
242 WARN(1, "%s failed for %s (error: %d parent: %s)\n",
243 __func__
, kobject_name(kobj
), error
,
244 parent
? kobject_name(parent
) : "'none'");
246 kobj
->state_in_sysfs
= 1;
252 * kobject_set_name_vargs - Set the name of an kobject
253 * @kobj: struct kobject to set the name of
254 * @fmt: format string used to build the name
255 * @vargs: vargs to format the string.
257 int kobject_set_name_vargs(struct kobject
*kobj
, const char *fmt
,
260 const char *old_name
= kobj
->name
;
263 if (kobj
->name
&& !fmt
)
266 kobj
->name
= kvasprintf(GFP_KERNEL
, fmt
, vargs
);
268 kobj
->name
= old_name
;
272 /* ewww... some of these buggers have '/' in the name ... */
273 while ((s
= strchr(kobj
->name
, '/')))
281 * kobject_set_name - Set the name of a kobject
282 * @kobj: struct kobject to set the name of
283 * @fmt: format string used to build the name
285 * This sets the name of the kobject. If you have already added the
286 * kobject to the system, you must call kobject_rename() in order to
287 * change the name of the kobject.
289 int kobject_set_name(struct kobject
*kobj
, const char *fmt
, ...)
294 va_start(vargs
, fmt
);
295 retval
= kobject_set_name_vargs(kobj
, fmt
, vargs
);
300 EXPORT_SYMBOL(kobject_set_name
);
303 * kobject_init - initialize a kobject structure
304 * @kobj: pointer to the kobject to initialize
305 * @ktype: pointer to the ktype for this kobject.
307 * This function will properly initialize a kobject such that it can then
308 * be passed to the kobject_add() call.
310 * After this function is called, the kobject MUST be cleaned up by a call
311 * to kobject_put(), not by a call to kfree directly to ensure that all of
312 * the memory is cleaned up properly.
314 void kobject_init(struct kobject
*kobj
, struct kobj_type
*ktype
)
319 err_str
= "invalid kobject pointer!";
323 err_str
= "must have a ktype to be initialized properly!\n";
326 if (kobj
->state_initialized
) {
327 /* do not error out as sometimes we can recover */
328 printk(KERN_ERR
"kobject (%p): tried to init an initialized "
329 "object, something is seriously wrong.\n", kobj
);
333 kobject_init_internal(kobj
);
338 printk(KERN_ERR
"kobject (%p): %s\n", kobj
, err_str
);
341 EXPORT_SYMBOL(kobject_init
);
343 static int kobject_add_varg(struct kobject
*kobj
, struct kobject
*parent
,
344 const char *fmt
, va_list vargs
)
348 retval
= kobject_set_name_vargs(kobj
, fmt
, vargs
);
350 printk(KERN_ERR
"kobject: can not set name properly!\n");
353 kobj
->parent
= parent
;
354 return kobject_add_internal(kobj
);
358 * kobject_add - the main kobject add function
359 * @kobj: the kobject to add
360 * @parent: pointer to the parent of the kobject.
361 * @fmt: format to name the kobject with.
363 * The kobject name is set and added to the kobject hierarchy in this
366 * If @parent is set, then the parent of the @kobj will be set to it.
367 * If @parent is NULL, then the parent of the @kobj will be set to the
368 * kobject associated with the kset assigned to this kobject. If no kset
369 * is assigned to the kobject, then the kobject will be located in the
370 * root of the sysfs tree.
372 * If this function returns an error, kobject_put() must be called to
373 * properly clean up the memory associated with the object.
374 * Under no instance should the kobject that is passed to this function
375 * be directly freed with a call to kfree(), that can leak memory.
377 * Note, no "add" uevent will be created with this call, the caller should set
378 * up all of the necessary sysfs files for the object and then call
379 * kobject_uevent() with the UEVENT_ADD parameter to ensure that
380 * userspace is properly notified of this kobject's creation.
382 int kobject_add(struct kobject
*kobj
, struct kobject
*parent
,
383 const char *fmt
, ...)
391 if (!kobj
->state_initialized
) {
392 printk(KERN_ERR
"kobject '%s' (%p): tried to add an "
393 "uninitialized object, something is seriously wrong.\n",
394 kobject_name(kobj
), kobj
);
399 retval
= kobject_add_varg(kobj
, parent
, fmt
, args
);
404 EXPORT_SYMBOL(kobject_add
);
407 * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy
408 * @kobj: pointer to the kobject to initialize
409 * @ktype: pointer to the ktype for this kobject.
410 * @parent: pointer to the parent of this kobject.
411 * @fmt: the name of the kobject.
413 * This function combines the call to kobject_init() and
414 * kobject_add(). The same type of error handling after a call to
415 * kobject_add() and kobject lifetime rules are the same here.
417 int kobject_init_and_add(struct kobject
*kobj
, struct kobj_type
*ktype
,
418 struct kobject
*parent
, const char *fmt
, ...)
423 kobject_init(kobj
, ktype
);
426 retval
= kobject_add_varg(kobj
, parent
, fmt
, args
);
431 EXPORT_SYMBOL_GPL(kobject_init_and_add
);
434 * kobject_rename - change the name of an object
435 * @kobj: object in question.
436 * @new_name: object's new name
438 * It is the responsibility of the caller to provide mutual
439 * exclusion between two different calls of kobject_rename
440 * on the same kobject and to ensure that new_name is valid and
441 * won't conflict with other kobjects.
443 int kobject_rename(struct kobject
*kobj
, const char *new_name
)
446 const char *devpath
= NULL
;
447 const char *dup_name
= NULL
, *name
;
448 char *devpath_string
= NULL
;
451 kobj
= kobject_get(kobj
);
457 devpath
= kobject_get_path(kobj
, GFP_KERNEL
);
462 devpath_string
= kmalloc(strlen(devpath
) + 15, GFP_KERNEL
);
463 if (!devpath_string
) {
467 sprintf(devpath_string
, "DEVPATH_OLD=%s", devpath
);
468 envp
[0] = devpath_string
;
471 name
= dup_name
= kstrdup(new_name
, GFP_KERNEL
);
477 error
= sysfs_rename_dir_ns(kobj
, new_name
, kobject_namespace(kobj
));
481 /* Install the new kobject name */
482 dup_name
= kobj
->name
;
485 /* This function is mostly/only used for network interface.
486 * Some hotplug package track interfaces by their name and
487 * therefore want to know when the name is changed by the user. */
488 kobject_uevent_env(kobj
, KOBJ_MOVE
, envp
);
492 kfree(devpath_string
);
498 EXPORT_SYMBOL_GPL(kobject_rename
);
501 * kobject_move - move object to another parent
502 * @kobj: object in question.
503 * @new_parent: object's new parent (can be NULL)
505 int kobject_move(struct kobject
*kobj
, struct kobject
*new_parent
)
508 struct kobject
*old_parent
;
509 const char *devpath
= NULL
;
510 char *devpath_string
= NULL
;
513 kobj
= kobject_get(kobj
);
516 new_parent
= kobject_get(new_parent
);
519 new_parent
= kobject_get(&kobj
->kset
->kobj
);
522 /* old object path */
523 devpath
= kobject_get_path(kobj
, GFP_KERNEL
);
528 devpath_string
= kmalloc(strlen(devpath
) + 15, GFP_KERNEL
);
529 if (!devpath_string
) {
533 sprintf(devpath_string
, "DEVPATH_OLD=%s", devpath
);
534 envp
[0] = devpath_string
;
536 error
= sysfs_move_dir_ns(kobj
, new_parent
, kobject_namespace(kobj
));
539 old_parent
= kobj
->parent
;
540 kobj
->parent
= new_parent
;
542 kobject_put(old_parent
);
543 kobject_uevent_env(kobj
, KOBJ_MOVE
, envp
);
545 kobject_put(new_parent
);
547 kfree(devpath_string
);
553 * kobject_del - unlink kobject from hierarchy.
556 void kobject_del(struct kobject
*kobj
)
558 struct kernfs_node
*sd
;
564 sysfs_remove_dir(kobj
);
567 kobj
->state_in_sysfs
= 0;
568 kobj_kset_leave(kobj
);
569 kobject_put(kobj
->parent
);
574 * kobject_get - increment refcount for object.
577 struct kobject
*kobject_get(struct kobject
*kobj
)
580 kref_get(&kobj
->kref
);
584 static struct kobject
* __must_check
kobject_get_unless_zero(struct kobject
*kobj
)
586 if (!kref_get_unless_zero(&kobj
->kref
))
592 * kobject_cleanup - free kobject resources.
593 * @kobj: object to cleanup
595 static void kobject_cleanup(struct kobject
*kobj
)
597 struct kobj_type
*t
= get_ktype(kobj
);
598 const char *name
= kobj
->name
;
600 pr_debug("kobject: '%s' (%p): %s, parent %p\n",
601 kobject_name(kobj
), kobj
, __func__
, kobj
->parent
);
603 if (t
&& !t
->release
)
604 pr_debug("kobject: '%s' (%p): does not have a release() "
605 "function, it is broken and must be fixed.\n",
606 kobject_name(kobj
), kobj
);
608 /* send "remove" if the caller did not do it but sent "add" */
609 if (kobj
->state_add_uevent_sent
&& !kobj
->state_remove_uevent_sent
) {
610 pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n",
611 kobject_name(kobj
), kobj
);
612 kobject_uevent(kobj
, KOBJ_REMOVE
);
615 /* remove from sysfs if the caller did not do it */
616 if (kobj
->state_in_sysfs
) {
617 pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n",
618 kobject_name(kobj
), kobj
);
622 if (t
&& t
->release
) {
623 pr_debug("kobject: '%s' (%p): calling ktype release\n",
624 kobject_name(kobj
), kobj
);
628 /* free name if we allocated it */
630 pr_debug("kobject: '%s': free name\n", name
);
635 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
636 static void kobject_delayed_cleanup(struct work_struct
*work
)
638 kobject_cleanup(container_of(to_delayed_work(work
),
639 struct kobject
, release
));
643 static void kobject_release(struct kref
*kref
)
645 struct kobject
*kobj
= container_of(kref
, struct kobject
, kref
);
646 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
647 unsigned long delay
= HZ
+ HZ
* (get_random_int() & 0x3);
648 pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n",
649 kobject_name(kobj
), kobj
, __func__
, kobj
->parent
, delay
);
650 INIT_DELAYED_WORK(&kobj
->release
, kobject_delayed_cleanup
);
652 schedule_delayed_work(&kobj
->release
, delay
);
654 kobject_cleanup(kobj
);
659 * kobject_put - decrement refcount for object.
662 * Decrement the refcount, and if 0, call kobject_cleanup().
664 void kobject_put(struct kobject
*kobj
)
667 if (!kobj
->state_initialized
)
668 WARN(1, KERN_WARNING
"kobject: '%s' (%p): is not "
669 "initialized, yet kobject_put() is being "
670 "called.\n", kobject_name(kobj
), kobj
);
671 kref_put(&kobj
->kref
, kobject_release
);
675 static void dynamic_kobj_release(struct kobject
*kobj
)
677 pr_debug("kobject: (%p): %s\n", kobj
, __func__
);
681 static struct kobj_type dynamic_kobj_ktype
= {
682 .release
= dynamic_kobj_release
,
683 .sysfs_ops
= &kobj_sysfs_ops
,
687 * kobject_create - create a struct kobject dynamically
689 * This function creates a kobject structure dynamically and sets it up
690 * to be a "dynamic" kobject with a default release function set up.
692 * If the kobject was not able to be created, NULL will be returned.
693 * The kobject structure returned from here must be cleaned up with a
694 * call to kobject_put() and not kfree(), as kobject_init() has
695 * already been called on this structure.
697 struct kobject
*kobject_create(void)
699 struct kobject
*kobj
;
701 kobj
= kzalloc(sizeof(*kobj
), GFP_KERNEL
);
705 kobject_init(kobj
, &dynamic_kobj_ktype
);
710 * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs
712 * @name: the name for the kobject
713 * @parent: the parent kobject of this kobject, if any.
715 * This function creates a kobject structure dynamically and registers it
716 * with sysfs. When you are finished with this structure, call
717 * kobject_put() and the structure will be dynamically freed when
718 * it is no longer being used.
720 * If the kobject was not able to be created, NULL will be returned.
722 struct kobject
*kobject_create_and_add(const char *name
, struct kobject
*parent
)
724 struct kobject
*kobj
;
727 kobj
= kobject_create();
731 retval
= kobject_add(kobj
, parent
, "%s", name
);
733 printk(KERN_WARNING
"%s: kobject_add error: %d\n",
740 EXPORT_SYMBOL_GPL(kobject_create_and_add
);
743 * kset_init - initialize a kset for use
746 void kset_init(struct kset
*k
)
748 kobject_init_internal(&k
->kobj
);
749 INIT_LIST_HEAD(&k
->list
);
750 spin_lock_init(&k
->list_lock
);
753 /* default kobject attribute operations */
754 static ssize_t
kobj_attr_show(struct kobject
*kobj
, struct attribute
*attr
,
757 struct kobj_attribute
*kattr
;
760 kattr
= container_of(attr
, struct kobj_attribute
, attr
);
762 ret
= kattr
->show(kobj
, kattr
, buf
);
766 static ssize_t
kobj_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
767 const char *buf
, size_t count
)
769 struct kobj_attribute
*kattr
;
772 kattr
= container_of(attr
, struct kobj_attribute
, attr
);
774 ret
= kattr
->store(kobj
, kattr
, buf
, count
);
778 const struct sysfs_ops kobj_sysfs_ops
= {
779 .show
= kobj_attr_show
,
780 .store
= kobj_attr_store
,
782 EXPORT_SYMBOL_GPL(kobj_sysfs_ops
);
785 * kset_register - initialize and add a kset.
788 int kset_register(struct kset
*k
)
796 err
= kobject_add_internal(&k
->kobj
);
799 kobject_uevent(&k
->kobj
, KOBJ_ADD
);
804 * kset_unregister - remove a kset.
807 void kset_unregister(struct kset
*k
)
811 kobject_del(&k
->kobj
);
812 kobject_put(&k
->kobj
);
816 * kset_find_obj - search for object in kset.
817 * @kset: kset we're looking in.
818 * @name: object's name.
820 * Lock kset via @kset->subsys, and iterate over @kset->list,
821 * looking for a matching kobject. If matching object is found
822 * take a reference and return the object.
824 struct kobject
*kset_find_obj(struct kset
*kset
, const char *name
)
827 struct kobject
*ret
= NULL
;
829 spin_lock(&kset
->list_lock
);
831 list_for_each_entry(k
, &kset
->list
, entry
) {
832 if (kobject_name(k
) && !strcmp(kobject_name(k
), name
)) {
833 ret
= kobject_get_unless_zero(k
);
838 spin_unlock(&kset
->list_lock
);
842 static void kset_release(struct kobject
*kobj
)
844 struct kset
*kset
= container_of(kobj
, struct kset
, kobj
);
845 pr_debug("kobject: '%s' (%p): %s\n",
846 kobject_name(kobj
), kobj
, __func__
);
850 static struct kobj_type kset_ktype
= {
851 .sysfs_ops
= &kobj_sysfs_ops
,
852 .release
= kset_release
,
856 * kset_create - create a struct kset dynamically
858 * @name: the name for the kset
859 * @uevent_ops: a struct kset_uevent_ops for the kset
860 * @parent_kobj: the parent kobject of this kset, if any.
862 * This function creates a kset structure dynamically. This structure can
863 * then be registered with the system and show up in sysfs with a call to
864 * kset_register(). When you are finished with this structure, if
865 * kset_register() has been called, call kset_unregister() and the
866 * structure will be dynamically freed when it is no longer being used.
868 * If the kset was not able to be created, NULL will be returned.
870 static struct kset
*kset_create(const char *name
,
871 const struct kset_uevent_ops
*uevent_ops
,
872 struct kobject
*parent_kobj
)
877 kset
= kzalloc(sizeof(*kset
), GFP_KERNEL
);
880 retval
= kobject_set_name(&kset
->kobj
, "%s", name
);
885 kset
->uevent_ops
= uevent_ops
;
886 kset
->kobj
.parent
= parent_kobj
;
889 * The kobject of this kset will have a type of kset_ktype and belong to
890 * no kset itself. That way we can properly free it when it is
891 * finished being used.
893 kset
->kobj
.ktype
= &kset_ktype
;
894 kset
->kobj
.kset
= NULL
;
900 * kset_create_and_add - create a struct kset dynamically and add it to sysfs
902 * @name: the name for the kset
903 * @uevent_ops: a struct kset_uevent_ops for the kset
904 * @parent_kobj: the parent kobject of this kset, if any.
906 * This function creates a kset structure dynamically and registers it
907 * with sysfs. When you are finished with this structure, call
908 * kset_unregister() and the structure will be dynamically freed when it
909 * is no longer being used.
911 * If the kset was not able to be created, NULL will be returned.
913 struct kset
*kset_create_and_add(const char *name
,
914 const struct kset_uevent_ops
*uevent_ops
,
915 struct kobject
*parent_kobj
)
920 kset
= kset_create(name
, uevent_ops
, parent_kobj
);
923 error
= kset_register(kset
);
930 EXPORT_SYMBOL_GPL(kset_create_and_add
);
933 static DEFINE_SPINLOCK(kobj_ns_type_lock
);
934 static const struct kobj_ns_type_operations
*kobj_ns_ops_tbl
[KOBJ_NS_TYPES
];
936 int kobj_ns_type_register(const struct kobj_ns_type_operations
*ops
)
938 enum kobj_ns_type type
= ops
->type
;
941 spin_lock(&kobj_ns_type_lock
);
944 if (type
>= KOBJ_NS_TYPES
)
948 if (type
<= KOBJ_NS_TYPE_NONE
)
952 if (kobj_ns_ops_tbl
[type
])
956 kobj_ns_ops_tbl
[type
] = ops
;
959 spin_unlock(&kobj_ns_type_lock
);
963 int kobj_ns_type_registered(enum kobj_ns_type type
)
967 spin_lock(&kobj_ns_type_lock
);
968 if ((type
> KOBJ_NS_TYPE_NONE
) && (type
< KOBJ_NS_TYPES
))
969 registered
= kobj_ns_ops_tbl
[type
] != NULL
;
970 spin_unlock(&kobj_ns_type_lock
);
975 const struct kobj_ns_type_operations
*kobj_child_ns_ops(struct kobject
*parent
)
977 const struct kobj_ns_type_operations
*ops
= NULL
;
979 if (parent
&& parent
->ktype
->child_ns_type
)
980 ops
= parent
->ktype
->child_ns_type(parent
);
985 const struct kobj_ns_type_operations
*kobj_ns_ops(struct kobject
*kobj
)
987 return kobj_child_ns_ops(kobj
->parent
);
990 bool kobj_ns_current_may_mount(enum kobj_ns_type type
)
992 bool may_mount
= true;
994 spin_lock(&kobj_ns_type_lock
);
995 if ((type
> KOBJ_NS_TYPE_NONE
) && (type
< KOBJ_NS_TYPES
) &&
996 kobj_ns_ops_tbl
[type
])
997 may_mount
= kobj_ns_ops_tbl
[type
]->current_may_mount();
998 spin_unlock(&kobj_ns_type_lock
);
1003 void *kobj_ns_grab_current(enum kobj_ns_type type
)
1007 spin_lock(&kobj_ns_type_lock
);
1008 if ((type
> KOBJ_NS_TYPE_NONE
) && (type
< KOBJ_NS_TYPES
) &&
1009 kobj_ns_ops_tbl
[type
])
1010 ns
= kobj_ns_ops_tbl
[type
]->grab_current_ns();
1011 spin_unlock(&kobj_ns_type_lock
);
1016 const void *kobj_ns_netlink(enum kobj_ns_type type
, struct sock
*sk
)
1018 const void *ns
= NULL
;
1020 spin_lock(&kobj_ns_type_lock
);
1021 if ((type
> KOBJ_NS_TYPE_NONE
) && (type
< KOBJ_NS_TYPES
) &&
1022 kobj_ns_ops_tbl
[type
])
1023 ns
= kobj_ns_ops_tbl
[type
]->netlink_ns(sk
);
1024 spin_unlock(&kobj_ns_type_lock
);
1029 const void *kobj_ns_initial(enum kobj_ns_type type
)
1031 const void *ns
= NULL
;
1033 spin_lock(&kobj_ns_type_lock
);
1034 if ((type
> KOBJ_NS_TYPE_NONE
) && (type
< KOBJ_NS_TYPES
) &&
1035 kobj_ns_ops_tbl
[type
])
1036 ns
= kobj_ns_ops_tbl
[type
]->initial_ns();
1037 spin_unlock(&kobj_ns_type_lock
);
1042 void kobj_ns_drop(enum kobj_ns_type type
, void *ns
)
1044 spin_lock(&kobj_ns_type_lock
);
1045 if ((type
> KOBJ_NS_TYPE_NONE
) && (type
< KOBJ_NS_TYPES
) &&
1046 kobj_ns_ops_tbl
[type
] && kobj_ns_ops_tbl
[type
]->drop_ns
)
1047 kobj_ns_ops_tbl
[type
]->drop_ns(ns
);
1048 spin_unlock(&kobj_ns_type_lock
);
1051 EXPORT_SYMBOL(kobject_get
);
1052 EXPORT_SYMBOL(kobject_put
);
1053 EXPORT_SYMBOL(kobject_del
);
1055 EXPORT_SYMBOL(kset_register
);
1056 EXPORT_SYMBOL(kset_unregister
);