Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm
[linux-2.6.git] / lib / kobject.c
blobb7e29a6056d3eb583728f0f381eaab07a61cfd03
1 /*
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>
22 * populate_dir - populate directory with attributes.
23 * @kobj: object we're working on.
25 * Most subsystems have a set of default attributes that are associated
26 * with an object that registers with them. This is a helper called during
27 * object registration that loops through the default attributes of the
28 * subsystem and creates attributes files for them in sysfs.
30 static int populate_dir(struct kobject *kobj)
32 struct kobj_type *t = get_ktype(kobj);
33 struct attribute *attr;
34 int error = 0;
35 int i;
37 if (t && t->default_attrs) {
38 for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) {
39 error = sysfs_create_file(kobj, attr);
40 if (error)
41 break;
44 return error;
47 static int create_dir(struct kobject *kobj)
49 int error = 0;
50 error = sysfs_create_dir(kobj);
51 if (!error) {
52 error = populate_dir(kobj);
53 if (error)
54 sysfs_remove_dir(kobj);
56 return error;
59 static int get_kobj_path_length(struct kobject *kobj)
61 int length = 1;
62 struct kobject *parent = kobj;
64 /* walk up the ancestors until we hit the one pointing to the
65 * root.
66 * Add 1 to strlen for leading '/' of each level.
68 do {
69 if (kobject_name(parent) == NULL)
70 return 0;
71 length += strlen(kobject_name(parent)) + 1;
72 parent = parent->parent;
73 } while (parent);
74 return length;
77 static void fill_kobj_path(struct kobject *kobj, char *path, int length)
79 struct kobject *parent;
81 --length;
82 for (parent = kobj; parent; parent = parent->parent) {
83 int cur = strlen(kobject_name(parent));
84 /* back up enough to print this name with '/' */
85 length -= cur;
86 strncpy(path + length, kobject_name(parent), cur);
87 *(path + --length) = '/';
90 pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj),
91 kobj, __func__, path);
94 /**
95 * kobject_get_path - generate and return the path associated with a given kobj and kset pair.
97 * @kobj: kobject in question, with which to build the path
98 * @gfp_mask: the allocation type used to allocate the path
100 * The result must be freed by the caller with kfree().
102 char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask)
104 char *path;
105 int len;
107 len = get_kobj_path_length(kobj);
108 if (len == 0)
109 return NULL;
110 path = kzalloc(len, gfp_mask);
111 if (!path)
112 return NULL;
113 fill_kobj_path(kobj, path, len);
115 return path;
117 EXPORT_SYMBOL_GPL(kobject_get_path);
119 /* add the kobject to its kset's list */
120 static void kobj_kset_join(struct kobject *kobj)
122 if (!kobj->kset)
123 return;
125 kset_get(kobj->kset);
126 spin_lock(&kobj->kset->list_lock);
127 list_add_tail(&kobj->entry, &kobj->kset->list);
128 spin_unlock(&kobj->kset->list_lock);
131 /* remove the kobject from its kset's list */
132 static void kobj_kset_leave(struct kobject *kobj)
134 if (!kobj->kset)
135 return;
137 spin_lock(&kobj->kset->list_lock);
138 list_del_init(&kobj->entry);
139 spin_unlock(&kobj->kset->list_lock);
140 kset_put(kobj->kset);
143 static void kobject_init_internal(struct kobject *kobj)
145 if (!kobj)
146 return;
147 kref_init(&kobj->kref);
148 INIT_LIST_HEAD(&kobj->entry);
149 kobj->state_in_sysfs = 0;
150 kobj->state_add_uevent_sent = 0;
151 kobj->state_remove_uevent_sent = 0;
152 kobj->state_initialized = 1;
156 static int kobject_add_internal(struct kobject *kobj)
158 int error = 0;
159 struct kobject *parent;
161 if (!kobj)
162 return -ENOENT;
164 if (!kobj->name || !kobj->name[0]) {
165 WARN(1, "kobject: (%p): attempted to be registered with empty "
166 "name!\n", kobj);
167 return -EINVAL;
170 parent = kobject_get(kobj->parent);
172 /* join kset if set, use it as parent if we do not already have one */
173 if (kobj->kset) {
174 if (!parent)
175 parent = kobject_get(&kobj->kset->kobj);
176 kobj_kset_join(kobj);
177 kobj->parent = parent;
180 pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n",
181 kobject_name(kobj), kobj, __func__,
182 parent ? kobject_name(parent) : "<NULL>",
183 kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>");
185 error = create_dir(kobj);
186 if (error) {
187 kobj_kset_leave(kobj);
188 kobject_put(parent);
189 kobj->parent = NULL;
191 /* be noisy on error issues */
192 if (error == -EEXIST)
193 WARN(1, "%s failed for %s with "
194 "-EEXIST, don't try to register things with "
195 "the same name in the same directory.\n",
196 __func__, kobject_name(kobj));
197 else
198 WARN(1, "%s failed for %s (error: %d parent: %s)\n",
199 __func__, kobject_name(kobj), error,
200 parent ? kobject_name(parent) : "'none'");
201 } else
202 kobj->state_in_sysfs = 1;
204 return error;
208 * kobject_set_name_vargs - Set the name of an kobject
209 * @kobj: struct kobject to set the name of
210 * @fmt: format string used to build the name
211 * @vargs: vargs to format the string.
213 int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
214 va_list vargs)
216 const char *old_name = kobj->name;
217 char *s;
219 if (kobj->name && !fmt)
220 return 0;
222 kobj->name = kvasprintf(GFP_KERNEL, fmt, vargs);
223 if (!kobj->name)
224 return -ENOMEM;
226 /* ewww... some of these buggers have '/' in the name ... */
227 while ((s = strchr(kobj->name, '/')))
228 s[0] = '!';
230 kfree(old_name);
231 return 0;
235 * kobject_set_name - Set the name of a kobject
236 * @kobj: struct kobject to set the name of
237 * @fmt: format string used to build the name
239 * This sets the name of the kobject. If you have already added the
240 * kobject to the system, you must call kobject_rename() in order to
241 * change the name of the kobject.
243 int kobject_set_name(struct kobject *kobj, const char *fmt, ...)
245 va_list vargs;
246 int retval;
248 va_start(vargs, fmt);
249 retval = kobject_set_name_vargs(kobj, fmt, vargs);
250 va_end(vargs);
252 return retval;
254 EXPORT_SYMBOL(kobject_set_name);
257 * kobject_init - initialize a kobject structure
258 * @kobj: pointer to the kobject to initialize
259 * @ktype: pointer to the ktype for this kobject.
261 * This function will properly initialize a kobject such that it can then
262 * be passed to the kobject_add() call.
264 * After this function is called, the kobject MUST be cleaned up by a call
265 * to kobject_put(), not by a call to kfree directly to ensure that all of
266 * the memory is cleaned up properly.
268 void kobject_init(struct kobject *kobj, struct kobj_type *ktype)
270 char *err_str;
272 if (!kobj) {
273 err_str = "invalid kobject pointer!";
274 goto error;
276 if (!ktype) {
277 err_str = "must have a ktype to be initialized properly!\n";
278 goto error;
280 if (kobj->state_initialized) {
281 /* do not error out as sometimes we can recover */
282 printk(KERN_ERR "kobject (%p): tried to init an initialized "
283 "object, something is seriously wrong.\n", kobj);
284 dump_stack();
287 kobject_init_internal(kobj);
288 kobj->ktype = ktype;
289 return;
291 error:
292 printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str);
293 dump_stack();
295 EXPORT_SYMBOL(kobject_init);
297 static int kobject_add_varg(struct kobject *kobj, struct kobject *parent,
298 const char *fmt, va_list vargs)
300 int retval;
302 retval = kobject_set_name_vargs(kobj, fmt, vargs);
303 if (retval) {
304 printk(KERN_ERR "kobject: can not set name properly!\n");
305 return retval;
307 kobj->parent = parent;
308 return kobject_add_internal(kobj);
312 * kobject_add - the main kobject add function
313 * @kobj: the kobject to add
314 * @parent: pointer to the parent of the kobject.
315 * @fmt: format to name the kobject with.
317 * The kobject name is set and added to the kobject hierarchy in this
318 * function.
320 * If @parent is set, then the parent of the @kobj will be set to it.
321 * If @parent is NULL, then the parent of the @kobj will be set to the
322 * kobject associted with the kset assigned to this kobject. If no kset
323 * is assigned to the kobject, then the kobject will be located in the
324 * root of the sysfs tree.
326 * If this function returns an error, kobject_put() must be called to
327 * properly clean up the memory associated with the object.
328 * Under no instance should the kobject that is passed to this function
329 * be directly freed with a call to kfree(), that can leak memory.
331 * Note, no "add" uevent will be created with this call, the caller should set
332 * up all of the necessary sysfs files for the object and then call
333 * kobject_uevent() with the UEVENT_ADD parameter to ensure that
334 * userspace is properly notified of this kobject's creation.
336 int kobject_add(struct kobject *kobj, struct kobject *parent,
337 const char *fmt, ...)
339 va_list args;
340 int retval;
342 if (!kobj)
343 return -EINVAL;
345 if (!kobj->state_initialized) {
346 printk(KERN_ERR "kobject '%s' (%p): tried to add an "
347 "uninitialized object, something is seriously wrong.\n",
348 kobject_name(kobj), kobj);
349 dump_stack();
350 return -EINVAL;
352 va_start(args, fmt);
353 retval = kobject_add_varg(kobj, parent, fmt, args);
354 va_end(args);
356 return retval;
358 EXPORT_SYMBOL(kobject_add);
361 * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy
362 * @kobj: pointer to the kobject to initialize
363 * @ktype: pointer to the ktype for this kobject.
364 * @parent: pointer to the parent of this kobject.
365 * @fmt: the name of the kobject.
367 * This function combines the call to kobject_init() and
368 * kobject_add(). The same type of error handling after a call to
369 * kobject_add() and kobject lifetime rules are the same here.
371 int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
372 struct kobject *parent, const char *fmt, ...)
374 va_list args;
375 int retval;
377 kobject_init(kobj, ktype);
379 va_start(args, fmt);
380 retval = kobject_add_varg(kobj, parent, fmt, args);
381 va_end(args);
383 return retval;
385 EXPORT_SYMBOL_GPL(kobject_init_and_add);
388 * kobject_rename - change the name of an object
389 * @kobj: object in question.
390 * @new_name: object's new name
392 * It is the responsibility of the caller to provide mutual
393 * exclusion between two different calls of kobject_rename
394 * on the same kobject and to ensure that new_name is valid and
395 * won't conflict with other kobjects.
397 int kobject_rename(struct kobject *kobj, const char *new_name)
399 int error = 0;
400 const char *devpath = NULL;
401 const char *dup_name = NULL, *name;
402 char *devpath_string = NULL;
403 char *envp[2];
405 kobj = kobject_get(kobj);
406 if (!kobj)
407 return -EINVAL;
408 if (!kobj->parent)
409 return -EINVAL;
411 devpath = kobject_get_path(kobj, GFP_KERNEL);
412 if (!devpath) {
413 error = -ENOMEM;
414 goto out;
416 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
417 if (!devpath_string) {
418 error = -ENOMEM;
419 goto out;
421 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
422 envp[0] = devpath_string;
423 envp[1] = NULL;
425 name = dup_name = kstrdup(new_name, GFP_KERNEL);
426 if (!name) {
427 error = -ENOMEM;
428 goto out;
431 error = sysfs_rename_dir(kobj, new_name);
432 if (error)
433 goto out;
435 /* Install the new kobject name */
436 dup_name = kobj->name;
437 kobj->name = name;
439 /* This function is mostly/only used for network interface.
440 * Some hotplug package track interfaces by their name and
441 * therefore want to know when the name is changed by the user. */
442 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
444 out:
445 kfree(dup_name);
446 kfree(devpath_string);
447 kfree(devpath);
448 kobject_put(kobj);
450 return error;
452 EXPORT_SYMBOL_GPL(kobject_rename);
455 * kobject_move - move object to another parent
456 * @kobj: object in question.
457 * @new_parent: object's new parent (can be NULL)
459 int kobject_move(struct kobject *kobj, struct kobject *new_parent)
461 int error;
462 struct kobject *old_parent;
463 const char *devpath = NULL;
464 char *devpath_string = NULL;
465 char *envp[2];
467 kobj = kobject_get(kobj);
468 if (!kobj)
469 return -EINVAL;
470 new_parent = kobject_get(new_parent);
471 if (!new_parent) {
472 if (kobj->kset)
473 new_parent = kobject_get(&kobj->kset->kobj);
475 /* old object path */
476 devpath = kobject_get_path(kobj, GFP_KERNEL);
477 if (!devpath) {
478 error = -ENOMEM;
479 goto out;
481 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
482 if (!devpath_string) {
483 error = -ENOMEM;
484 goto out;
486 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
487 envp[0] = devpath_string;
488 envp[1] = NULL;
489 error = sysfs_move_dir(kobj, new_parent);
490 if (error)
491 goto out;
492 old_parent = kobj->parent;
493 kobj->parent = new_parent;
494 new_parent = NULL;
495 kobject_put(old_parent);
496 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
497 out:
498 kobject_put(new_parent);
499 kobject_put(kobj);
500 kfree(devpath_string);
501 kfree(devpath);
502 return error;
506 * kobject_del - unlink kobject from hierarchy.
507 * @kobj: object.
509 void kobject_del(struct kobject *kobj)
511 if (!kobj)
512 return;
514 sysfs_remove_dir(kobj);
515 kobj->state_in_sysfs = 0;
516 kobj_kset_leave(kobj);
517 kobject_put(kobj->parent);
518 kobj->parent = NULL;
522 * kobject_get - increment refcount for object.
523 * @kobj: object.
525 struct kobject *kobject_get(struct kobject *kobj)
527 if (kobj)
528 kref_get(&kobj->kref);
529 return kobj;
532 static struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj)
534 if (!kref_get_unless_zero(&kobj->kref))
535 kobj = NULL;
536 return kobj;
540 * kobject_cleanup - free kobject resources.
541 * @kobj: object to cleanup
543 static void kobject_cleanup(struct kobject *kobj)
545 struct kobj_type *t = get_ktype(kobj);
546 const char *name = kobj->name;
548 pr_debug("kobject: '%s' (%p): %s\n",
549 kobject_name(kobj), kobj, __func__);
551 if (t && !t->release)
552 pr_debug("kobject: '%s' (%p): does not have a release() "
553 "function, it is broken and must be fixed.\n",
554 kobject_name(kobj), kobj);
556 /* send "remove" if the caller did not do it but sent "add" */
557 if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) {
558 pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n",
559 kobject_name(kobj), kobj);
560 kobject_uevent(kobj, KOBJ_REMOVE);
563 /* remove from sysfs if the caller did not do it */
564 if (kobj->state_in_sysfs) {
565 pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n",
566 kobject_name(kobj), kobj);
567 kobject_del(kobj);
570 if (t && t->release) {
571 pr_debug("kobject: '%s' (%p): calling ktype release\n",
572 kobject_name(kobj), kobj);
573 t->release(kobj);
576 /* free name if we allocated it */
577 if (name) {
578 pr_debug("kobject: '%s': free name\n", name);
579 kfree(name);
583 static void kobject_release(struct kref *kref)
585 kobject_cleanup(container_of(kref, struct kobject, kref));
589 * kobject_put - decrement refcount for object.
590 * @kobj: object.
592 * Decrement the refcount, and if 0, call kobject_cleanup().
594 void kobject_put(struct kobject *kobj)
596 if (kobj) {
597 if (!kobj->state_initialized)
598 WARN(1, KERN_WARNING "kobject: '%s' (%p): is not "
599 "initialized, yet kobject_put() is being "
600 "called.\n", kobject_name(kobj), kobj);
601 kref_put(&kobj->kref, kobject_release);
605 static void dynamic_kobj_release(struct kobject *kobj)
607 pr_debug("kobject: (%p): %s\n", kobj, __func__);
608 kfree(kobj);
611 static struct kobj_type dynamic_kobj_ktype = {
612 .release = dynamic_kobj_release,
613 .sysfs_ops = &kobj_sysfs_ops,
617 * kobject_create - create a struct kobject dynamically
619 * This function creates a kobject structure dynamically and sets it up
620 * to be a "dynamic" kobject with a default release function set up.
622 * If the kobject was not able to be created, NULL will be returned.
623 * The kobject structure returned from here must be cleaned up with a
624 * call to kobject_put() and not kfree(), as kobject_init() has
625 * already been called on this structure.
627 struct kobject *kobject_create(void)
629 struct kobject *kobj;
631 kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
632 if (!kobj)
633 return NULL;
635 kobject_init(kobj, &dynamic_kobj_ktype);
636 return kobj;
640 * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs
642 * @name: the name for the kobject
643 * @parent: the parent kobject of this kobject, if any.
645 * This function creates a kobject structure dynamically and registers it
646 * with sysfs. When you are finished with this structure, call
647 * kobject_put() and the structure will be dynamically freed when
648 * it is no longer being used.
650 * If the kobject was not able to be created, NULL will be returned.
652 struct kobject *kobject_create_and_add(const char *name, struct kobject *parent)
654 struct kobject *kobj;
655 int retval;
657 kobj = kobject_create();
658 if (!kobj)
659 return NULL;
661 retval = kobject_add(kobj, parent, "%s", name);
662 if (retval) {
663 printk(KERN_WARNING "%s: kobject_add error: %d\n",
664 __func__, retval);
665 kobject_put(kobj);
666 kobj = NULL;
668 return kobj;
670 EXPORT_SYMBOL_GPL(kobject_create_and_add);
673 * kset_init - initialize a kset for use
674 * @k: kset
676 void kset_init(struct kset *k)
678 kobject_init_internal(&k->kobj);
679 INIT_LIST_HEAD(&k->list);
680 spin_lock_init(&k->list_lock);
683 /* default kobject attribute operations */
684 static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr,
685 char *buf)
687 struct kobj_attribute *kattr;
688 ssize_t ret = -EIO;
690 kattr = container_of(attr, struct kobj_attribute, attr);
691 if (kattr->show)
692 ret = kattr->show(kobj, kattr, buf);
693 return ret;
696 static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr,
697 const char *buf, size_t count)
699 struct kobj_attribute *kattr;
700 ssize_t ret = -EIO;
702 kattr = container_of(attr, struct kobj_attribute, attr);
703 if (kattr->store)
704 ret = kattr->store(kobj, kattr, buf, count);
705 return ret;
708 const struct sysfs_ops kobj_sysfs_ops = {
709 .show = kobj_attr_show,
710 .store = kobj_attr_store,
714 * kset_register - initialize and add a kset.
715 * @k: kset.
717 int kset_register(struct kset *k)
719 int err;
721 if (!k)
722 return -EINVAL;
724 kset_init(k);
725 err = kobject_add_internal(&k->kobj);
726 if (err)
727 return err;
728 kobject_uevent(&k->kobj, KOBJ_ADD);
729 return 0;
733 * kset_unregister - remove a kset.
734 * @k: kset.
736 void kset_unregister(struct kset *k)
738 if (!k)
739 return;
740 kobject_put(&k->kobj);
744 * kset_find_obj - search for object in kset.
745 * @kset: kset we're looking in.
746 * @name: object's name.
748 * Lock kset via @kset->subsys, and iterate over @kset->list,
749 * looking for a matching kobject. If matching object is found
750 * take a reference and return the object.
752 struct kobject *kset_find_obj(struct kset *kset, const char *name)
754 struct kobject *k;
755 struct kobject *ret = NULL;
757 spin_lock(&kset->list_lock);
759 list_for_each_entry(k, &kset->list, entry) {
760 if (kobject_name(k) && !strcmp(kobject_name(k), name)) {
761 ret = kobject_get_unless_zero(k);
762 break;
766 spin_unlock(&kset->list_lock);
767 return ret;
770 static void kset_release(struct kobject *kobj)
772 struct kset *kset = container_of(kobj, struct kset, kobj);
773 pr_debug("kobject: '%s' (%p): %s\n",
774 kobject_name(kobj), kobj, __func__);
775 kfree(kset);
778 static struct kobj_type kset_ktype = {
779 .sysfs_ops = &kobj_sysfs_ops,
780 .release = kset_release,
784 * kset_create - create a struct kset dynamically
786 * @name: the name for the kset
787 * @uevent_ops: a struct kset_uevent_ops for the kset
788 * @parent_kobj: the parent kobject of this kset, if any.
790 * This function creates a kset structure dynamically. This structure can
791 * then be registered with the system and show up in sysfs with a call to
792 * kset_register(). When you are finished with this structure, if
793 * kset_register() has been called, call kset_unregister() and the
794 * structure will be dynamically freed when it is no longer being used.
796 * If the kset was not able to be created, NULL will be returned.
798 static struct kset *kset_create(const char *name,
799 const struct kset_uevent_ops *uevent_ops,
800 struct kobject *parent_kobj)
802 struct kset *kset;
803 int retval;
805 kset = kzalloc(sizeof(*kset), GFP_KERNEL);
806 if (!kset)
807 return NULL;
808 retval = kobject_set_name(&kset->kobj, name);
809 if (retval) {
810 kfree(kset);
811 return NULL;
813 kset->uevent_ops = uevent_ops;
814 kset->kobj.parent = parent_kobj;
817 * The kobject of this kset will have a type of kset_ktype and belong to
818 * no kset itself. That way we can properly free it when it is
819 * finished being used.
821 kset->kobj.ktype = &kset_ktype;
822 kset->kobj.kset = NULL;
824 return kset;
828 * kset_create_and_add - create a struct kset dynamically and add it to sysfs
830 * @name: the name for the kset
831 * @uevent_ops: a struct kset_uevent_ops for the kset
832 * @parent_kobj: the parent kobject of this kset, if any.
834 * This function creates a kset structure dynamically and registers it
835 * with sysfs. When you are finished with this structure, call
836 * kset_unregister() and the structure will be dynamically freed when it
837 * is no longer being used.
839 * If the kset was not able to be created, NULL will be returned.
841 struct kset *kset_create_and_add(const char *name,
842 const struct kset_uevent_ops *uevent_ops,
843 struct kobject *parent_kobj)
845 struct kset *kset;
846 int error;
848 kset = kset_create(name, uevent_ops, parent_kobj);
849 if (!kset)
850 return NULL;
851 error = kset_register(kset);
852 if (error) {
853 kfree(kset);
854 return NULL;
856 return kset;
858 EXPORT_SYMBOL_GPL(kset_create_and_add);
861 static DEFINE_SPINLOCK(kobj_ns_type_lock);
862 static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES];
864 int kobj_ns_type_register(const struct kobj_ns_type_operations *ops)
866 enum kobj_ns_type type = ops->type;
867 int error;
869 spin_lock(&kobj_ns_type_lock);
871 error = -EINVAL;
872 if (type >= KOBJ_NS_TYPES)
873 goto out;
875 error = -EINVAL;
876 if (type <= KOBJ_NS_TYPE_NONE)
877 goto out;
879 error = -EBUSY;
880 if (kobj_ns_ops_tbl[type])
881 goto out;
883 error = 0;
884 kobj_ns_ops_tbl[type] = ops;
886 out:
887 spin_unlock(&kobj_ns_type_lock);
888 return error;
891 int kobj_ns_type_registered(enum kobj_ns_type type)
893 int registered = 0;
895 spin_lock(&kobj_ns_type_lock);
896 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES))
897 registered = kobj_ns_ops_tbl[type] != NULL;
898 spin_unlock(&kobj_ns_type_lock);
900 return registered;
903 const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent)
905 const struct kobj_ns_type_operations *ops = NULL;
907 if (parent && parent->ktype->child_ns_type)
908 ops = parent->ktype->child_ns_type(parent);
910 return ops;
913 const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj)
915 return kobj_child_ns_ops(kobj->parent);
919 void *kobj_ns_grab_current(enum kobj_ns_type type)
921 void *ns = NULL;
923 spin_lock(&kobj_ns_type_lock);
924 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
925 kobj_ns_ops_tbl[type])
926 ns = kobj_ns_ops_tbl[type]->grab_current_ns();
927 spin_unlock(&kobj_ns_type_lock);
929 return ns;
932 const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk)
934 const void *ns = NULL;
936 spin_lock(&kobj_ns_type_lock);
937 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
938 kobj_ns_ops_tbl[type])
939 ns = kobj_ns_ops_tbl[type]->netlink_ns(sk);
940 spin_unlock(&kobj_ns_type_lock);
942 return ns;
945 const void *kobj_ns_initial(enum kobj_ns_type type)
947 const void *ns = NULL;
949 spin_lock(&kobj_ns_type_lock);
950 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
951 kobj_ns_ops_tbl[type])
952 ns = kobj_ns_ops_tbl[type]->initial_ns();
953 spin_unlock(&kobj_ns_type_lock);
955 return ns;
958 void kobj_ns_drop(enum kobj_ns_type type, void *ns)
960 spin_lock(&kobj_ns_type_lock);
961 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
962 kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns)
963 kobj_ns_ops_tbl[type]->drop_ns(ns);
964 spin_unlock(&kobj_ns_type_lock);
967 EXPORT_SYMBOL(kobject_get);
968 EXPORT_SYMBOL(kobject_put);
969 EXPORT_SYMBOL(kobject_del);
971 EXPORT_SYMBOL(kset_register);
972 EXPORT_SYMBOL(kset_unregister);