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>
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
);
35 if (!ns_ops
|| ns_ops
->type
== KOBJ_NS_TYPE_NONE
)
38 ns
= kobj
->ktype
->namespace(kobj
);
39 WARN_ON(!ns
); /* @kobj in a namespace is required to have !NULL tag */
44 * populate_dir - populate directory with attributes.
45 * @kobj: object we're working on.
47 * Most subsystems have a set of default attributes that are associated
48 * with an object that registers with them. This is a helper called during
49 * object registration that loops through the default attributes of the
50 * subsystem and creates attributes files for them in sysfs.
52 static int populate_dir(struct kobject
*kobj
)
54 struct kobj_type
*t
= get_ktype(kobj
);
55 struct attribute
*attr
;
59 if (t
&& t
->default_attrs
) {
60 for (i
= 0; (attr
= t
->default_attrs
[i
]) != NULL
; i
++) {
61 error
= sysfs_create_file(kobj
, attr
);
69 static int create_dir(struct kobject
*kobj
)
73 error
= sysfs_create_dir_ns(kobj
, kobject_namespace(kobj
));
75 error
= populate_dir(kobj
);
77 sysfs_remove_dir(kobj
);
82 static int get_kobj_path_length(struct kobject
*kobj
)
85 struct kobject
*parent
= kobj
;
87 /* walk up the ancestors until we hit the one pointing to the
89 * Add 1 to strlen for leading '/' of each level.
92 if (kobject_name(parent
) == NULL
)
94 length
+= strlen(kobject_name(parent
)) + 1;
95 parent
= parent
->parent
;
100 static void fill_kobj_path(struct kobject
*kobj
, char *path
, int length
)
102 struct kobject
*parent
;
105 for (parent
= kobj
; parent
; parent
= parent
->parent
) {
106 int cur
= strlen(kobject_name(parent
));
107 /* back up enough to print this name with '/' */
109 strncpy(path
+ length
, kobject_name(parent
), cur
);
110 *(path
+ --length
) = '/';
113 pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj
),
114 kobj
, __func__
, path
);
118 * kobject_get_path - generate and return the path associated with a given kobj and kset pair.
120 * @kobj: kobject in question, with which to build the path
121 * @gfp_mask: the allocation type used to allocate the path
123 * The result must be freed by the caller with kfree().
125 char *kobject_get_path(struct kobject
*kobj
, gfp_t gfp_mask
)
130 len
= get_kobj_path_length(kobj
);
133 path
= kzalloc(len
, gfp_mask
);
136 fill_kobj_path(kobj
, path
, len
);
140 EXPORT_SYMBOL_GPL(kobject_get_path
);
142 /* add the kobject to its kset's list */
143 static void kobj_kset_join(struct kobject
*kobj
)
148 kset_get(kobj
->kset
);
149 spin_lock(&kobj
->kset
->list_lock
);
150 list_add_tail(&kobj
->entry
, &kobj
->kset
->list
);
151 spin_unlock(&kobj
->kset
->list_lock
);
154 /* remove the kobject from its kset's list */
155 static void kobj_kset_leave(struct kobject
*kobj
)
160 spin_lock(&kobj
->kset
->list_lock
);
161 list_del_init(&kobj
->entry
);
162 spin_unlock(&kobj
->kset
->list_lock
);
163 kset_put(kobj
->kset
);
166 static void kobject_init_internal(struct kobject
*kobj
)
170 kref_init(&kobj
->kref
);
171 INIT_LIST_HEAD(&kobj
->entry
);
172 kobj
->state_in_sysfs
= 0;
173 kobj
->state_add_uevent_sent
= 0;
174 kobj
->state_remove_uevent_sent
= 0;
175 kobj
->state_initialized
= 1;
179 static int kobject_add_internal(struct kobject
*kobj
)
182 struct kobject
*parent
;
187 if (!kobj
->name
|| !kobj
->name
[0]) {
188 WARN(1, "kobject: (%p): attempted to be registered with empty "
193 parent
= kobject_get(kobj
->parent
);
195 /* join kset if set, use it as parent if we do not already have one */
198 parent
= kobject_get(&kobj
->kset
->kobj
);
199 kobj_kset_join(kobj
);
200 kobj
->parent
= parent
;
203 pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n",
204 kobject_name(kobj
), kobj
, __func__
,
205 parent
? kobject_name(parent
) : "<NULL>",
206 kobj
->kset
? kobject_name(&kobj
->kset
->kobj
) : "<NULL>");
208 error
= create_dir(kobj
);
210 kobj_kset_leave(kobj
);
214 /* be noisy on error issues */
215 if (error
== -EEXIST
)
216 WARN(1, "%s failed for %s with "
217 "-EEXIST, don't try to register things with "
218 "the same name in the same directory.\n",
219 __func__
, kobject_name(kobj
));
221 WARN(1, "%s failed for %s (error: %d parent: %s)\n",
222 __func__
, kobject_name(kobj
), error
,
223 parent
? kobject_name(parent
) : "'none'");
225 kobj
->state_in_sysfs
= 1;
231 * kobject_set_name_vargs - Set the name of an kobject
232 * @kobj: struct kobject to set the name of
233 * @fmt: format string used to build the name
234 * @vargs: vargs to format the string.
236 int kobject_set_name_vargs(struct kobject
*kobj
, const char *fmt
,
239 const char *old_name
= kobj
->name
;
242 if (kobj
->name
&& !fmt
)
245 kobj
->name
= kvasprintf(GFP_KERNEL
, fmt
, vargs
);
249 /* ewww... some of these buggers have '/' in the name ... */
250 while ((s
= strchr(kobj
->name
, '/')))
258 * kobject_set_name - Set the name of a kobject
259 * @kobj: struct kobject to set the name of
260 * @fmt: format string used to build the name
262 * This sets the name of the kobject. If you have already added the
263 * kobject to the system, you must call kobject_rename() in order to
264 * change the name of the kobject.
266 int kobject_set_name(struct kobject
*kobj
, const char *fmt
, ...)
271 va_start(vargs
, fmt
);
272 retval
= kobject_set_name_vargs(kobj
, fmt
, vargs
);
277 EXPORT_SYMBOL(kobject_set_name
);
280 * kobject_init - initialize a kobject structure
281 * @kobj: pointer to the kobject to initialize
282 * @ktype: pointer to the ktype for this kobject.
284 * This function will properly initialize a kobject such that it can then
285 * be passed to the kobject_add() call.
287 * After this function is called, the kobject MUST be cleaned up by a call
288 * to kobject_put(), not by a call to kfree directly to ensure that all of
289 * the memory is cleaned up properly.
291 void kobject_init(struct kobject
*kobj
, struct kobj_type
*ktype
)
296 err_str
= "invalid kobject pointer!";
300 err_str
= "must have a ktype to be initialized properly!\n";
303 if (kobj
->state_initialized
) {
304 /* do not error out as sometimes we can recover */
305 printk(KERN_ERR
"kobject (%p): tried to init an initialized "
306 "object, something is seriously wrong.\n", kobj
);
310 kobject_init_internal(kobj
);
315 printk(KERN_ERR
"kobject (%p): %s\n", kobj
, err_str
);
318 EXPORT_SYMBOL(kobject_init
);
320 static int kobject_add_varg(struct kobject
*kobj
, struct kobject
*parent
,
321 const char *fmt
, va_list vargs
)
325 retval
= kobject_set_name_vargs(kobj
, fmt
, vargs
);
327 printk(KERN_ERR
"kobject: can not set name properly!\n");
330 kobj
->parent
= parent
;
331 return kobject_add_internal(kobj
);
335 * kobject_add - the main kobject add function
336 * @kobj: the kobject to add
337 * @parent: pointer to the parent of the kobject.
338 * @fmt: format to name the kobject with.
340 * The kobject name is set and added to the kobject hierarchy in this
343 * If @parent is set, then the parent of the @kobj will be set to it.
344 * If @parent is NULL, then the parent of the @kobj will be set to the
345 * kobject associted with the kset assigned to this kobject. If no kset
346 * is assigned to the kobject, then the kobject will be located in the
347 * root of the sysfs tree.
349 * If this function returns an error, kobject_put() must be called to
350 * properly clean up the memory associated with the object.
351 * Under no instance should the kobject that is passed to this function
352 * be directly freed with a call to kfree(), that can leak memory.
354 * Note, no "add" uevent will be created with this call, the caller should set
355 * up all of the necessary sysfs files for the object and then call
356 * kobject_uevent() with the UEVENT_ADD parameter to ensure that
357 * userspace is properly notified of this kobject's creation.
359 int kobject_add(struct kobject
*kobj
, struct kobject
*parent
,
360 const char *fmt
, ...)
368 if (!kobj
->state_initialized
) {
369 printk(KERN_ERR
"kobject '%s' (%p): tried to add an "
370 "uninitialized object, something is seriously wrong.\n",
371 kobject_name(kobj
), kobj
);
376 retval
= kobject_add_varg(kobj
, parent
, fmt
, args
);
381 EXPORT_SYMBOL(kobject_add
);
384 * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy
385 * @kobj: pointer to the kobject to initialize
386 * @ktype: pointer to the ktype for this kobject.
387 * @parent: pointer to the parent of this kobject.
388 * @fmt: the name of the kobject.
390 * This function combines the call to kobject_init() and
391 * kobject_add(). The same type of error handling after a call to
392 * kobject_add() and kobject lifetime rules are the same here.
394 int kobject_init_and_add(struct kobject
*kobj
, struct kobj_type
*ktype
,
395 struct kobject
*parent
, const char *fmt
, ...)
400 kobject_init(kobj
, ktype
);
403 retval
= kobject_add_varg(kobj
, parent
, fmt
, args
);
408 EXPORT_SYMBOL_GPL(kobject_init_and_add
);
411 * kobject_rename - change the name of an object
412 * @kobj: object in question.
413 * @new_name: object's new name
415 * It is the responsibility of the caller to provide mutual
416 * exclusion between two different calls of kobject_rename
417 * on the same kobject and to ensure that new_name is valid and
418 * won't conflict with other kobjects.
420 int kobject_rename(struct kobject
*kobj
, const char *new_name
)
423 const char *devpath
= NULL
;
424 const char *dup_name
= NULL
, *name
;
425 char *devpath_string
= NULL
;
428 kobj
= kobject_get(kobj
);
434 devpath
= kobject_get_path(kobj
, GFP_KERNEL
);
439 devpath_string
= kmalloc(strlen(devpath
) + 15, GFP_KERNEL
);
440 if (!devpath_string
) {
444 sprintf(devpath_string
, "DEVPATH_OLD=%s", devpath
);
445 envp
[0] = devpath_string
;
448 name
= dup_name
= kstrdup(new_name
, GFP_KERNEL
);
454 error
= sysfs_rename_dir_ns(kobj
, new_name
, kobject_namespace(kobj
));
458 /* Install the new kobject name */
459 dup_name
= kobj
->name
;
462 /* This function is mostly/only used for network interface.
463 * Some hotplug package track interfaces by their name and
464 * therefore want to know when the name is changed by the user. */
465 kobject_uevent_env(kobj
, KOBJ_MOVE
, envp
);
469 kfree(devpath_string
);
475 EXPORT_SYMBOL_GPL(kobject_rename
);
478 * kobject_move - move object to another parent
479 * @kobj: object in question.
480 * @new_parent: object's new parent (can be NULL)
482 int kobject_move(struct kobject
*kobj
, struct kobject
*new_parent
)
485 struct kobject
*old_parent
;
486 const char *devpath
= NULL
;
487 char *devpath_string
= NULL
;
490 kobj
= kobject_get(kobj
);
493 new_parent
= kobject_get(new_parent
);
496 new_parent
= kobject_get(&kobj
->kset
->kobj
);
499 /* old object path */
500 devpath
= kobject_get_path(kobj
, GFP_KERNEL
);
505 devpath_string
= kmalloc(strlen(devpath
) + 15, GFP_KERNEL
);
506 if (!devpath_string
) {
510 sprintf(devpath_string
, "DEVPATH_OLD=%s", devpath
);
511 envp
[0] = devpath_string
;
513 error
= sysfs_move_dir_ns(kobj
, new_parent
, kobject_namespace(kobj
));
516 old_parent
= kobj
->parent
;
517 kobj
->parent
= new_parent
;
519 kobject_put(old_parent
);
520 kobject_uevent_env(kobj
, KOBJ_MOVE
, envp
);
522 kobject_put(new_parent
);
524 kfree(devpath_string
);
530 * kobject_del - unlink kobject from hierarchy.
533 void kobject_del(struct kobject
*kobj
)
538 sysfs_remove_dir(kobj
);
539 kobj
->state_in_sysfs
= 0;
540 kobj_kset_leave(kobj
);
541 kobject_put(kobj
->parent
);
546 * kobject_get - increment refcount for object.
549 struct kobject
*kobject_get(struct kobject
*kobj
)
552 kref_get(&kobj
->kref
);
556 static struct kobject
* __must_check
kobject_get_unless_zero(struct kobject
*kobj
)
558 if (!kref_get_unless_zero(&kobj
->kref
))
564 * kobject_cleanup - free kobject resources.
565 * @kobj: object to cleanup
567 static void kobject_cleanup(struct kobject
*kobj
)
569 struct kobj_type
*t
= get_ktype(kobj
);
570 const char *name
= kobj
->name
;
572 pr_debug("kobject: '%s' (%p): %s, parent %p\n",
573 kobject_name(kobj
), kobj
, __func__
, kobj
->parent
);
575 if (t
&& !t
->release
)
576 pr_debug("kobject: '%s' (%p): does not have a release() "
577 "function, it is broken and must be fixed.\n",
578 kobject_name(kobj
), kobj
);
580 /* send "remove" if the caller did not do it but sent "add" */
581 if (kobj
->state_add_uevent_sent
&& !kobj
->state_remove_uevent_sent
) {
582 pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n",
583 kobject_name(kobj
), kobj
);
584 kobject_uevent(kobj
, KOBJ_REMOVE
);
587 /* remove from sysfs if the caller did not do it */
588 if (kobj
->state_in_sysfs
) {
589 pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n",
590 kobject_name(kobj
), kobj
);
594 if (t
&& t
->release
) {
595 pr_debug("kobject: '%s' (%p): calling ktype release\n",
596 kobject_name(kobj
), kobj
);
600 /* free name if we allocated it */
602 pr_debug("kobject: '%s': free name\n", name
);
607 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
608 static void kobject_delayed_cleanup(struct work_struct
*work
)
610 kobject_cleanup(container_of(to_delayed_work(work
),
611 struct kobject
, release
));
615 static void kobject_release(struct kref
*kref
)
617 struct kobject
*kobj
= container_of(kref
, struct kobject
, kref
);
618 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
619 pr_debug("kobject: '%s' (%p): %s, parent %p (delayed)\n",
620 kobject_name(kobj
), kobj
, __func__
, kobj
->parent
);
621 INIT_DELAYED_WORK(&kobj
->release
, kobject_delayed_cleanup
);
622 schedule_delayed_work(&kobj
->release
, HZ
);
624 kobject_cleanup(kobj
);
629 * kobject_put - decrement refcount for object.
632 * Decrement the refcount, and if 0, call kobject_cleanup().
634 void kobject_put(struct kobject
*kobj
)
637 if (!kobj
->state_initialized
)
638 WARN(1, KERN_WARNING
"kobject: '%s' (%p): is not "
639 "initialized, yet kobject_put() is being "
640 "called.\n", kobject_name(kobj
), kobj
);
641 kref_put(&kobj
->kref
, kobject_release
);
645 static void dynamic_kobj_release(struct kobject
*kobj
)
647 pr_debug("kobject: (%p): %s\n", kobj
, __func__
);
651 static struct kobj_type dynamic_kobj_ktype
= {
652 .release
= dynamic_kobj_release
,
653 .sysfs_ops
= &kobj_sysfs_ops
,
657 * kobject_create - create a struct kobject dynamically
659 * This function creates a kobject structure dynamically and sets it up
660 * to be a "dynamic" kobject with a default release function set up.
662 * If the kobject was not able to be created, NULL will be returned.
663 * The kobject structure returned from here must be cleaned up with a
664 * call to kobject_put() and not kfree(), as kobject_init() has
665 * already been called on this structure.
667 struct kobject
*kobject_create(void)
669 struct kobject
*kobj
;
671 kobj
= kzalloc(sizeof(*kobj
), GFP_KERNEL
);
675 kobject_init(kobj
, &dynamic_kobj_ktype
);
680 * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs
682 * @name: the name for the kobject
683 * @parent: the parent kobject of this kobject, if any.
685 * This function creates a kobject structure dynamically and registers it
686 * with sysfs. When you are finished with this structure, call
687 * kobject_put() and the structure will be dynamically freed when
688 * it is no longer being used.
690 * If the kobject was not able to be created, NULL will be returned.
692 struct kobject
*kobject_create_and_add(const char *name
, struct kobject
*parent
)
694 struct kobject
*kobj
;
697 kobj
= kobject_create();
701 retval
= kobject_add(kobj
, parent
, "%s", name
);
703 printk(KERN_WARNING
"%s: kobject_add error: %d\n",
710 EXPORT_SYMBOL_GPL(kobject_create_and_add
);
713 * kset_init - initialize a kset for use
716 void kset_init(struct kset
*k
)
718 kobject_init_internal(&k
->kobj
);
719 INIT_LIST_HEAD(&k
->list
);
720 spin_lock_init(&k
->list_lock
);
723 /* default kobject attribute operations */
724 static ssize_t
kobj_attr_show(struct kobject
*kobj
, struct attribute
*attr
,
727 struct kobj_attribute
*kattr
;
730 kattr
= container_of(attr
, struct kobj_attribute
, attr
);
732 ret
= kattr
->show(kobj
, kattr
, buf
);
736 static ssize_t
kobj_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
737 const char *buf
, size_t count
)
739 struct kobj_attribute
*kattr
;
742 kattr
= container_of(attr
, struct kobj_attribute
, attr
);
744 ret
= kattr
->store(kobj
, kattr
, buf
, count
);
748 const struct sysfs_ops kobj_sysfs_ops
= {
749 .show
= kobj_attr_show
,
750 .store
= kobj_attr_store
,
754 * kobj_completion_init - initialize a kobj_completion object.
755 * @kc: kobj_completion
756 * @ktype: type of kobject to initialize
758 * kobj_completion structures can be embedded within structures with different
759 * lifetime rules. During the release of the enclosing object, we can
760 * wait on the release of the kobject so that we don't free it while it's
763 void kobj_completion_init(struct kobj_completion
*kc
, struct kobj_type
*ktype
)
765 init_completion(&kc
->kc_unregister
);
766 kobject_init(&kc
->kc_kobj
, ktype
);
768 EXPORT_SYMBOL_GPL(kobj_completion_init
);
771 * kobj_completion_release - release a kobj_completion object
772 * @kobj: kobject embedded in kobj_completion
774 * Used with kobject_release to notify waiters that the kobject has been
777 void kobj_completion_release(struct kobject
*kobj
)
779 struct kobj_completion
*kc
= kobj_to_kobj_completion(kobj
);
780 complete(&kc
->kc_unregister
);
782 EXPORT_SYMBOL_GPL(kobj_completion_release
);
785 * kobj_completion_del_and_wait - release the kobject and wait for it
786 * @kc: kobj_completion object to release
788 * Delete the kobject from sysfs and drop the reference count. Then wait
789 * until any other outstanding references are also dropped. This routine
790 * is only necessary once other references may have been taken on the
791 * kobject. Typically this happens when the kobject has been published
792 * to sysfs via kobject_add.
794 void kobj_completion_del_and_wait(struct kobj_completion
*kc
)
796 kobject_del(&kc
->kc_kobj
);
797 kobject_put(&kc
->kc_kobj
);
798 wait_for_completion(&kc
->kc_unregister
);
800 EXPORT_SYMBOL_GPL(kobj_completion_del_and_wait
);
803 * kset_register - initialize and add a kset.
806 int kset_register(struct kset
*k
)
814 err
= kobject_add_internal(&k
->kobj
);
817 kobject_uevent(&k
->kobj
, KOBJ_ADD
);
822 * kset_unregister - remove a kset.
825 void kset_unregister(struct kset
*k
)
829 kobject_put(&k
->kobj
);
833 * kset_find_obj - search for object in kset.
834 * @kset: kset we're looking in.
835 * @name: object's name.
837 * Lock kset via @kset->subsys, and iterate over @kset->list,
838 * looking for a matching kobject. If matching object is found
839 * take a reference and return the object.
841 struct kobject
*kset_find_obj(struct kset
*kset
, const char *name
)
844 struct kobject
*ret
= NULL
;
846 spin_lock(&kset
->list_lock
);
848 list_for_each_entry(k
, &kset
->list
, entry
) {
849 if (kobject_name(k
) && !strcmp(kobject_name(k
), name
)) {
850 ret
= kobject_get_unless_zero(k
);
855 spin_unlock(&kset
->list_lock
);
859 static void kset_release(struct kobject
*kobj
)
861 struct kset
*kset
= container_of(kobj
, struct kset
, kobj
);
862 pr_debug("kobject: '%s' (%p): %s\n",
863 kobject_name(kobj
), kobj
, __func__
);
867 static struct kobj_type kset_ktype
= {
868 .sysfs_ops
= &kobj_sysfs_ops
,
869 .release
= kset_release
,
873 * kset_create - create a struct kset dynamically
875 * @name: the name for the kset
876 * @uevent_ops: a struct kset_uevent_ops for the kset
877 * @parent_kobj: the parent kobject of this kset, if any.
879 * This function creates a kset structure dynamically. This structure can
880 * then be registered with the system and show up in sysfs with a call to
881 * kset_register(). When you are finished with this structure, if
882 * kset_register() has been called, call kset_unregister() and the
883 * structure will be dynamically freed when it is no longer being used.
885 * If the kset was not able to be created, NULL will be returned.
887 static struct kset
*kset_create(const char *name
,
888 const struct kset_uevent_ops
*uevent_ops
,
889 struct kobject
*parent_kobj
)
894 kset
= kzalloc(sizeof(*kset
), GFP_KERNEL
);
897 retval
= kobject_set_name(&kset
->kobj
, "%s", name
);
902 kset
->uevent_ops
= uevent_ops
;
903 kset
->kobj
.parent
= parent_kobj
;
906 * The kobject of this kset will have a type of kset_ktype and belong to
907 * no kset itself. That way we can properly free it when it is
908 * finished being used.
910 kset
->kobj
.ktype
= &kset_ktype
;
911 kset
->kobj
.kset
= NULL
;
917 * kset_create_and_add - create a struct kset dynamically and add it to sysfs
919 * @name: the name for the kset
920 * @uevent_ops: a struct kset_uevent_ops for the kset
921 * @parent_kobj: the parent kobject of this kset, if any.
923 * This function creates a kset structure dynamically and registers it
924 * with sysfs. When you are finished with this structure, call
925 * kset_unregister() and the structure will be dynamically freed when it
926 * is no longer being used.
928 * If the kset was not able to be created, NULL will be returned.
930 struct kset
*kset_create_and_add(const char *name
,
931 const struct kset_uevent_ops
*uevent_ops
,
932 struct kobject
*parent_kobj
)
937 kset
= kset_create(name
, uevent_ops
, parent_kobj
);
940 error
= kset_register(kset
);
947 EXPORT_SYMBOL_GPL(kset_create_and_add
);
950 static DEFINE_SPINLOCK(kobj_ns_type_lock
);
951 static const struct kobj_ns_type_operations
*kobj_ns_ops_tbl
[KOBJ_NS_TYPES
];
953 int kobj_ns_type_register(const struct kobj_ns_type_operations
*ops
)
955 enum kobj_ns_type type
= ops
->type
;
958 spin_lock(&kobj_ns_type_lock
);
961 if (type
>= KOBJ_NS_TYPES
)
965 if (type
<= KOBJ_NS_TYPE_NONE
)
969 if (kobj_ns_ops_tbl
[type
])
973 kobj_ns_ops_tbl
[type
] = ops
;
976 spin_unlock(&kobj_ns_type_lock
);
980 int kobj_ns_type_registered(enum kobj_ns_type type
)
984 spin_lock(&kobj_ns_type_lock
);
985 if ((type
> KOBJ_NS_TYPE_NONE
) && (type
< KOBJ_NS_TYPES
))
986 registered
= kobj_ns_ops_tbl
[type
] != NULL
;
987 spin_unlock(&kobj_ns_type_lock
);
992 const struct kobj_ns_type_operations
*kobj_child_ns_ops(struct kobject
*parent
)
994 const struct kobj_ns_type_operations
*ops
= NULL
;
996 if (parent
&& parent
->ktype
->child_ns_type
)
997 ops
= parent
->ktype
->child_ns_type(parent
);
1002 const struct kobj_ns_type_operations
*kobj_ns_ops(struct kobject
*kobj
)
1004 return kobj_child_ns_ops(kobj
->parent
);
1007 bool kobj_ns_current_may_mount(enum kobj_ns_type type
)
1009 bool may_mount
= false;
1011 if (type
== KOBJ_NS_TYPE_NONE
)
1014 spin_lock(&kobj_ns_type_lock
);
1015 if ((type
> KOBJ_NS_TYPE_NONE
) && (type
< KOBJ_NS_TYPES
) &&
1016 kobj_ns_ops_tbl
[type
])
1017 may_mount
= kobj_ns_ops_tbl
[type
]->current_may_mount();
1018 spin_unlock(&kobj_ns_type_lock
);
1023 void *kobj_ns_grab_current(enum kobj_ns_type type
)
1027 spin_lock(&kobj_ns_type_lock
);
1028 if ((type
> KOBJ_NS_TYPE_NONE
) && (type
< KOBJ_NS_TYPES
) &&
1029 kobj_ns_ops_tbl
[type
])
1030 ns
= kobj_ns_ops_tbl
[type
]->grab_current_ns();
1031 spin_unlock(&kobj_ns_type_lock
);
1036 const void *kobj_ns_netlink(enum kobj_ns_type type
, struct sock
*sk
)
1038 const void *ns
= NULL
;
1040 spin_lock(&kobj_ns_type_lock
);
1041 if ((type
> KOBJ_NS_TYPE_NONE
) && (type
< KOBJ_NS_TYPES
) &&
1042 kobj_ns_ops_tbl
[type
])
1043 ns
= kobj_ns_ops_tbl
[type
]->netlink_ns(sk
);
1044 spin_unlock(&kobj_ns_type_lock
);
1049 const void *kobj_ns_initial(enum kobj_ns_type type
)
1051 const void *ns
= NULL
;
1053 spin_lock(&kobj_ns_type_lock
);
1054 if ((type
> KOBJ_NS_TYPE_NONE
) && (type
< KOBJ_NS_TYPES
) &&
1055 kobj_ns_ops_tbl
[type
])
1056 ns
= kobj_ns_ops_tbl
[type
]->initial_ns();
1057 spin_unlock(&kobj_ns_type_lock
);
1062 void kobj_ns_drop(enum kobj_ns_type type
, void *ns
)
1064 spin_lock(&kobj_ns_type_lock
);
1065 if ((type
> KOBJ_NS_TYPE_NONE
) && (type
< KOBJ_NS_TYPES
) &&
1066 kobj_ns_ops_tbl
[type
] && kobj_ns_ops_tbl
[type
]->drop_ns
)
1067 kobj_ns_ops_tbl
[type
]->drop_ns(ns
);
1068 spin_unlock(&kobj_ns_type_lock
);
1071 EXPORT_SYMBOL(kobject_get
);
1072 EXPORT_SYMBOL(kobject_put
);
1073 EXPORT_SYMBOL(kobject_del
);
1075 EXPORT_SYMBOL(kset_register
);
1076 EXPORT_SYMBOL(kset_unregister
);