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13#include <linux/kobject.h>
14#include <linux/string.h>
15#include <linux/export.h>
16#include <linux/stat.h>
17#include <linux/slab.h>
18#include <linux/random.h>
19
20
21
22
23
24
25
26
27
28const void *kobject_namespace(struct kobject *kobj)
29{
30 const struct kobj_ns_type_operations *ns_ops = kobj_ns_ops(kobj);
31
32 if (!ns_ops || ns_ops->type == KOBJ_NS_TYPE_NONE)
33 return NULL;
34
35 return kobj->ktype->namespace(kobj);
36}
37
38
39
40
41
42
43
44
45
46
47
48void kobject_get_ownership(struct kobject *kobj, kuid_t *uid, kgid_t *gid)
49{
50 *uid = GLOBAL_ROOT_UID;
51 *gid = GLOBAL_ROOT_GID;
52
53 if (kobj->ktype->get_ownership)
54 kobj->ktype->get_ownership(kobj, uid, gid);
55}
56
57
58
59
60
61
62
63
64
65
66static int populate_dir(struct kobject *kobj)
67{
68 struct kobj_type *t = get_ktype(kobj);
69 struct attribute *attr;
70 int error = 0;
71 int i;
72
73 if (t && t->default_attrs) {
74 for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) {
75 error = sysfs_create_file(kobj, attr);
76 if (error)
77 break;
78 }
79 }
80 return error;
81}
82
83static int create_dir(struct kobject *kobj)
84{
85 const struct kobj_ns_type_operations *ops;
86 int error;
87
88 error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj));
89 if (error)
90 return error;
91
92 error = populate_dir(kobj);
93 if (error) {
94 sysfs_remove_dir(kobj);
95 return error;
96 }
97
98
99
100
101
102 sysfs_get(kobj->sd);
103
104
105
106
107
108 ops = kobj_child_ns_ops(kobj);
109 if (ops) {
110 BUG_ON(ops->type <= KOBJ_NS_TYPE_NONE);
111 BUG_ON(ops->type >= KOBJ_NS_TYPES);
112 BUG_ON(!kobj_ns_type_registered(ops->type));
113
114 sysfs_enable_ns(kobj->sd);
115 }
116
117 return 0;
118}
119
120static int get_kobj_path_length(struct kobject *kobj)
121{
122 int length = 1;
123 struct kobject *parent = kobj;
124
125
126
127
128
129 do {
130 if (kobject_name(parent) == NULL)
131 return 0;
132 length += strlen(kobject_name(parent)) + 1;
133 parent = parent->parent;
134 } while (parent);
135 return length;
136}
137
138static void fill_kobj_path(struct kobject *kobj, char *path, int length)
139{
140 struct kobject *parent;
141
142 --length;
143 for (parent = kobj; parent; parent = parent->parent) {
144 int cur = strlen(kobject_name(parent));
145
146 length -= cur;
147 memcpy(path + length, kobject_name(parent), cur);
148 *(path + --length) = '/';
149 }
150
151 pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj),
152 kobj, __func__, path);
153}
154
155
156
157
158
159
160
161
162
163char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask)
164{
165 char *path;
166 int len;
167
168 len = get_kobj_path_length(kobj);
169 if (len == 0)
170 return NULL;
171 path = kzalloc(len, gfp_mask);
172 if (!path)
173 return NULL;
174 fill_kobj_path(kobj, path, len);
175
176 return path;
177}
178EXPORT_SYMBOL_GPL(kobject_get_path);
179
180
181static void kobj_kset_join(struct kobject *kobj)
182{
183 if (!kobj->kset)
184 return;
185
186 kset_get(kobj->kset);
187 spin_lock(&kobj->kset->list_lock);
188 list_add_tail(&kobj->entry, &kobj->kset->list);
189 spin_unlock(&kobj->kset->list_lock);
190}
191
192
193static void kobj_kset_leave(struct kobject *kobj)
194{
195 if (!kobj->kset)
196 return;
197
198 spin_lock(&kobj->kset->list_lock);
199 list_del_init(&kobj->entry);
200 spin_unlock(&kobj->kset->list_lock);
201 kset_put(kobj->kset);
202}
203
204static void kobject_init_internal(struct kobject *kobj)
205{
206 if (!kobj)
207 return;
208 kref_init(&kobj->kref);
209 INIT_LIST_HEAD(&kobj->entry);
210 kobj->state_in_sysfs = 0;
211 kobj->state_add_uevent_sent = 0;
212 kobj->state_remove_uevent_sent = 0;
213 kobj->state_initialized = 1;
214}
215
216
217static int kobject_add_internal(struct kobject *kobj)
218{
219 int error = 0;
220 struct kobject *parent;
221
222 if (!kobj)
223 return -ENOENT;
224
225 if (!kobj->name || !kobj->name[0]) {
226 WARN(1,
227 "kobject: (%p): attempted to be registered with empty name!\n",
228 kobj);
229 return -EINVAL;
230 }
231
232 parent = kobject_get(kobj->parent);
233
234
235 if (kobj->kset) {
236 if (!parent)
237 parent = kobject_get(&kobj->kset->kobj);
238 kobj_kset_join(kobj);
239 kobj->parent = parent;
240 }
241
242 pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n",
243 kobject_name(kobj), kobj, __func__,
244 parent ? kobject_name(parent) : "<NULL>",
245 kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>");
246
247 error = create_dir(kobj);
248 if (error) {
249 kobj_kset_leave(kobj);
250 kobject_put(parent);
251 kobj->parent = NULL;
252
253
254 if (error == -EEXIST)
255 pr_err("%s failed for %s with -EEXIST, don't try to register things with the same name in the same directory.\n",
256 __func__, kobject_name(kobj));
257 else
258 pr_err("%s failed for %s (error: %d parent: %s)\n",
259 __func__, kobject_name(kobj), error,
260 parent ? kobject_name(parent) : "'none'");
261 } else
262 kobj->state_in_sysfs = 1;
263
264 return error;
265}
266
267
268
269
270
271
272
273int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
274 va_list vargs)
275{
276 const char *s;
277
278 if (kobj->name && !fmt)
279 return 0;
280
281 s = kvasprintf_const(GFP_KERNEL, fmt, vargs);
282 if (!s)
283 return -ENOMEM;
284
285
286
287
288
289
290
291 if (strchr(s, '/')) {
292 char *t;
293
294 t = kstrdup(s, GFP_KERNEL);
295 kfree_const(s);
296 if (!t)
297 return -ENOMEM;
298 strreplace(t, '/', '!');
299 s = t;
300 }
301 kfree_const(kobj->name);
302 kobj->name = s;
303
304 return 0;
305}
306
307
308
309
310
311
312
313
314
315
316int kobject_set_name(struct kobject *kobj, const char *fmt, ...)
317{
318 va_list vargs;
319 int retval;
320
321 va_start(vargs, fmt);
322 retval = kobject_set_name_vargs(kobj, fmt, vargs);
323 va_end(vargs);
324
325 return retval;
326}
327EXPORT_SYMBOL(kobject_set_name);
328
329
330
331
332
333
334
335
336
337
338
339
340
341void kobject_init(struct kobject *kobj, struct kobj_type *ktype)
342{
343 char *err_str;
344
345 if (!kobj) {
346 err_str = "invalid kobject pointer!";
347 goto error;
348 }
349 if (!ktype) {
350 err_str = "must have a ktype to be initialized properly!\n";
351 goto error;
352 }
353 if (kobj->state_initialized) {
354
355 pr_err("kobject (%p): tried to init an initialized object, something is seriously wrong.\n",
356 kobj);
357 dump_stack();
358 }
359
360 kobject_init_internal(kobj);
361 kobj->ktype = ktype;
362 return;
363
364error:
365 pr_err("kobject (%p): %s\n", kobj, err_str);
366 dump_stack();
367}
368EXPORT_SYMBOL(kobject_init);
369
370static __printf(3, 0) int kobject_add_varg(struct kobject *kobj,
371 struct kobject *parent,
372 const char *fmt, va_list vargs)
373{
374 int retval;
375
376 retval = kobject_set_name_vargs(kobj, fmt, vargs);
377 if (retval) {
378 pr_err("kobject: can not set name properly!\n");
379 return retval;
380 }
381 kobj->parent = parent;
382 return kobject_add_internal(kobj);
383}
384
385
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409
410int kobject_add(struct kobject *kobj, struct kobject *parent,
411 const char *fmt, ...)
412{
413 va_list args;
414 int retval;
415
416 if (!kobj)
417 return -EINVAL;
418
419 if (!kobj->state_initialized) {
420 pr_err("kobject '%s' (%p): tried to add an uninitialized object, something is seriously wrong.\n",
421 kobject_name(kobj), kobj);
422 dump_stack();
423 return -EINVAL;
424 }
425 va_start(args, fmt);
426 retval = kobject_add_varg(kobj, parent, fmt, args);
427 va_end(args);
428
429 return retval;
430}
431EXPORT_SYMBOL(kobject_add);
432
433
434
435
436
437
438
439
440
441
442
443
444int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
445 struct kobject *parent, const char *fmt, ...)
446{
447 va_list args;
448 int retval;
449
450 kobject_init(kobj, ktype);
451
452 va_start(args, fmt);
453 retval = kobject_add_varg(kobj, parent, fmt, args);
454 va_end(args);
455
456 return retval;
457}
458EXPORT_SYMBOL_GPL(kobject_init_and_add);
459
460
461
462
463
464
465
466
467
468
469
470int kobject_rename(struct kobject *kobj, const char *new_name)
471{
472 int error = 0;
473 const char *devpath = NULL;
474 const char *dup_name = NULL, *name;
475 char *devpath_string = NULL;
476 char *envp[2];
477
478 kobj = kobject_get(kobj);
479 if (!kobj)
480 return -EINVAL;
481 if (!kobj->parent)
482 return -EINVAL;
483
484 devpath = kobject_get_path(kobj, GFP_KERNEL);
485 if (!devpath) {
486 error = -ENOMEM;
487 goto out;
488 }
489 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
490 if (!devpath_string) {
491 error = -ENOMEM;
492 goto out;
493 }
494 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
495 envp[0] = devpath_string;
496 envp[1] = NULL;
497
498 name = dup_name = kstrdup_const(new_name, GFP_KERNEL);
499 if (!name) {
500 error = -ENOMEM;
501 goto out;
502 }
503
504 error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj));
505 if (error)
506 goto out;
507
508
509 dup_name = kobj->name;
510 kobj->name = name;
511
512
513
514
515 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
516
517out:
518 kfree_const(dup_name);
519 kfree(devpath_string);
520 kfree(devpath);
521 kobject_put(kobj);
522
523 return error;
524}
525EXPORT_SYMBOL_GPL(kobject_rename);
526
527
528
529
530
531
532int kobject_move(struct kobject *kobj, struct kobject *new_parent)
533{
534 int error;
535 struct kobject *old_parent;
536 const char *devpath = NULL;
537 char *devpath_string = NULL;
538 char *envp[2];
539
540 kobj = kobject_get(kobj);
541 if (!kobj)
542 return -EINVAL;
543 new_parent = kobject_get(new_parent);
544 if (!new_parent) {
545 if (kobj->kset)
546 new_parent = kobject_get(&kobj->kset->kobj);
547 }
548
549
550 devpath = kobject_get_path(kobj, GFP_KERNEL);
551 if (!devpath) {
552 error = -ENOMEM;
553 goto out;
554 }
555 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
556 if (!devpath_string) {
557 error = -ENOMEM;
558 goto out;
559 }
560 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
561 envp[0] = devpath_string;
562 envp[1] = NULL;
563 error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj));
564 if (error)
565 goto out;
566 old_parent = kobj->parent;
567 kobj->parent = new_parent;
568 new_parent = NULL;
569 kobject_put(old_parent);
570 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
571out:
572 kobject_put(new_parent);
573 kobject_put(kobj);
574 kfree(devpath_string);
575 kfree(devpath);
576 return error;
577}
578EXPORT_SYMBOL_GPL(kobject_move);
579
580
581
582
583
584void kobject_del(struct kobject *kobj)
585{
586 struct kernfs_node *sd;
587
588 if (!kobj)
589 return;
590
591 sd = kobj->sd;
592 sysfs_remove_dir(kobj);
593 sysfs_put(sd);
594
595 kobj->state_in_sysfs = 0;
596 kobj_kset_leave(kobj);
597 kobject_put(kobj->parent);
598 kobj->parent = NULL;
599}
600EXPORT_SYMBOL(kobject_del);
601
602
603
604
605
606struct kobject *kobject_get(struct kobject *kobj)
607{
608 if (kobj) {
609 if (!kobj->state_initialized)
610 WARN(1, KERN_WARNING
611 "kobject: '%s' (%p): is not initialized, yet kobject_get() is being called.\n",
612 kobject_name(kobj), kobj);
613 kref_get(&kobj->kref);
614 }
615 return kobj;
616}
617EXPORT_SYMBOL(kobject_get);
618
619struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj)
620{
621 if (!kobj)
622 return NULL;
623 if (!kref_get_unless_zero(&kobj->kref))
624 kobj = NULL;
625 return kobj;
626}
627EXPORT_SYMBOL(kobject_get_unless_zero);
628
629
630
631
632
633static void kobject_cleanup(struct kobject *kobj)
634{
635 struct kobj_type *t = get_ktype(kobj);
636 const char *name = kobj->name;
637
638 pr_debug("kobject: '%s' (%p): %s, parent %p\n",
639 kobject_name(kobj), kobj, __func__, kobj->parent);
640
641 if (t && !t->release)
642 pr_debug("kobject: '%s' (%p): does not have a release() function, it is broken and must be fixed.\n",
643 kobject_name(kobj), kobj);
644
645
646 if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) {
647 pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n",
648 kobject_name(kobj), kobj);
649 kobject_uevent(kobj, KOBJ_REMOVE);
650 }
651
652
653 if (kobj->state_in_sysfs) {
654 pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n",
655 kobject_name(kobj), kobj);
656 kobject_del(kobj);
657 }
658
659 if (t && t->release) {
660 pr_debug("kobject: '%s' (%p): calling ktype release\n",
661 kobject_name(kobj), kobj);
662 t->release(kobj);
663 }
664
665
666 if (name) {
667 pr_debug("kobject: '%s': free name\n", name);
668 kfree_const(name);
669 }
670}
671
672#ifdef CONFIG_DEBUG_KOBJECT_RELEASE
673static void kobject_delayed_cleanup(struct work_struct *work)
674{
675 kobject_cleanup(container_of(to_delayed_work(work),
676 struct kobject, release));
677}
678#endif
679
680static void kobject_release(struct kref *kref)
681{
682 struct kobject *kobj = container_of(kref, struct kobject, kref);
683#ifdef CONFIG_DEBUG_KOBJECT_RELEASE
684 unsigned long delay = HZ + HZ * (get_random_int() & 0x3);
685 pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n",
686 kobject_name(kobj), kobj, __func__, kobj->parent, delay);
687 INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup);
688
689 schedule_delayed_work(&kobj->release, delay);
690#else
691 kobject_cleanup(kobj);
692#endif
693}
694
695
696
697
698
699
700
701void kobject_put(struct kobject *kobj)
702{
703 if (kobj) {
704 if (!kobj->state_initialized)
705 WARN(1, KERN_WARNING
706 "kobject: '%s' (%p): is not initialized, yet kobject_put() is being called.\n",
707 kobject_name(kobj), kobj);
708 kref_put(&kobj->kref, kobject_release);
709 }
710}
711EXPORT_SYMBOL(kobject_put);
712
713static void dynamic_kobj_release(struct kobject *kobj)
714{
715 pr_debug("kobject: (%p): %s\n", kobj, __func__);
716 kfree(kobj);
717}
718
719static struct kobj_type dynamic_kobj_ktype = {
720 .release = dynamic_kobj_release,
721 .sysfs_ops = &kobj_sysfs_ops,
722};
723
724
725
726
727
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730
731
732
733
734
735struct kobject *kobject_create(void)
736{
737 struct kobject *kobj;
738
739 kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
740 if (!kobj)
741 return NULL;
742
743 kobject_init(kobj, &dynamic_kobj_ktype);
744 return kobj;
745}
746
747
748
749
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758
759
760struct kobject *kobject_create_and_add(const char *name, struct kobject *parent)
761{
762 struct kobject *kobj;
763 int retval;
764
765 kobj = kobject_create();
766 if (!kobj)
767 return NULL;
768
769 retval = kobject_add(kobj, parent, "%s", name);
770 if (retval) {
771 pr_warn("%s: kobject_add error: %d\n", __func__, retval);
772 kobject_put(kobj);
773 kobj = NULL;
774 }
775 return kobj;
776}
777EXPORT_SYMBOL_GPL(kobject_create_and_add);
778
779
780
781
782
783void kset_init(struct kset *k)
784{
785 kobject_init_internal(&k->kobj);
786 INIT_LIST_HEAD(&k->list);
787 spin_lock_init(&k->list_lock);
788}
789
790
791static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr,
792 char *buf)
793{
794 struct kobj_attribute *kattr;
795 ssize_t ret = -EIO;
796
797 kattr = container_of(attr, struct kobj_attribute, attr);
798 if (kattr->show)
799 ret = kattr->show(kobj, kattr, buf);
800 return ret;
801}
802
803static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr,
804 const char *buf, size_t count)
805{
806 struct kobj_attribute *kattr;
807 ssize_t ret = -EIO;
808
809 kattr = container_of(attr, struct kobj_attribute, attr);
810 if (kattr->store)
811 ret = kattr->store(kobj, kattr, buf, count);
812 return ret;
813}
814
815const struct sysfs_ops kobj_sysfs_ops = {
816 .show = kobj_attr_show,
817 .store = kobj_attr_store,
818};
819EXPORT_SYMBOL_GPL(kobj_sysfs_ops);
820
821
822
823
824
825int kset_register(struct kset *k)
826{
827 int err;
828
829 if (!k)
830 return -EINVAL;
831
832 kset_init(k);
833 err = kobject_add_internal(&k->kobj);
834 if (err)
835 return err;
836 kobject_uevent(&k->kobj, KOBJ_ADD);
837 return 0;
838}
839EXPORT_SYMBOL(kset_register);
840
841
842
843
844
845void kset_unregister(struct kset *k)
846{
847 if (!k)
848 return;
849 kobject_del(&k->kobj);
850 kobject_put(&k->kobj);
851}
852EXPORT_SYMBOL(kset_unregister);
853
854
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860
861
862
863struct kobject *kset_find_obj(struct kset *kset, const char *name)
864{
865 struct kobject *k;
866 struct kobject *ret = NULL;
867
868 spin_lock(&kset->list_lock);
869
870 list_for_each_entry(k, &kset->list, entry) {
871 if (kobject_name(k) && !strcmp(kobject_name(k), name)) {
872 ret = kobject_get_unless_zero(k);
873 break;
874 }
875 }
876
877 spin_unlock(&kset->list_lock);
878 return ret;
879}
880EXPORT_SYMBOL_GPL(kset_find_obj);
881
882static void kset_release(struct kobject *kobj)
883{
884 struct kset *kset = container_of(kobj, struct kset, kobj);
885 pr_debug("kobject: '%s' (%p): %s\n",
886 kobject_name(kobj), kobj, __func__);
887 kfree(kset);
888}
889
890void kset_get_ownership(struct kobject *kobj, kuid_t *uid, kgid_t *gid)
891{
892 if (kobj->parent)
893 kobject_get_ownership(kobj->parent, uid, gid);
894}
895
896static struct kobj_type kset_ktype = {
897 .sysfs_ops = &kobj_sysfs_ops,
898 .release = kset_release,
899 .get_ownership = kset_get_ownership,
900};
901
902
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914
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916
917static struct kset *kset_create(const char *name,
918 const struct kset_uevent_ops *uevent_ops,
919 struct kobject *parent_kobj)
920{
921 struct kset *kset;
922 int retval;
923
924 kset = kzalloc(sizeof(*kset), GFP_KERNEL);
925 if (!kset)
926 return NULL;
927 retval = kobject_set_name(&kset->kobj, "%s", name);
928 if (retval) {
929 kfree(kset);
930 return NULL;
931 }
932 kset->uevent_ops = uevent_ops;
933 kset->kobj.parent = parent_kobj;
934
935
936
937
938
939
940 kset->kobj.ktype = &kset_ktype;
941 kset->kobj.kset = NULL;
942
943 return kset;
944}
945
946
947
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949
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958
959
960struct kset *kset_create_and_add(const char *name,
961 const struct kset_uevent_ops *uevent_ops,
962 struct kobject *parent_kobj)
963{
964 struct kset *kset;
965 int error;
966
967 kset = kset_create(name, uevent_ops, parent_kobj);
968 if (!kset)
969 return NULL;
970 error = kset_register(kset);
971 if (error) {
972 kfree(kset);
973 return NULL;
974 }
975 return kset;
976}
977EXPORT_SYMBOL_GPL(kset_create_and_add);
978
979
980static DEFINE_SPINLOCK(kobj_ns_type_lock);
981static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES];
982
983int kobj_ns_type_register(const struct kobj_ns_type_operations *ops)
984{
985 enum kobj_ns_type type = ops->type;
986 int error;
987
988 spin_lock(&kobj_ns_type_lock);
989
990 error = -EINVAL;
991 if (type >= KOBJ_NS_TYPES)
992 goto out;
993
994 error = -EINVAL;
995 if (type <= KOBJ_NS_TYPE_NONE)
996 goto out;
997
998 error = -EBUSY;
999 if (kobj_ns_ops_tbl[type])
1000 goto out;
1001
1002 error = 0;
1003 kobj_ns_ops_tbl[type] = ops;
1004
1005out:
1006 spin_unlock(&kobj_ns_type_lock);
1007 return error;
1008}
1009
1010int kobj_ns_type_registered(enum kobj_ns_type type)
1011{
1012 int registered = 0;
1013
1014 spin_lock(&kobj_ns_type_lock);
1015 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES))
1016 registered = kobj_ns_ops_tbl[type] != NULL;
1017 spin_unlock(&kobj_ns_type_lock);
1018
1019 return registered;
1020}
1021
1022const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent)
1023{
1024 const struct kobj_ns_type_operations *ops = NULL;
1025
1026 if (parent && parent->ktype && parent->ktype->child_ns_type)
1027 ops = parent->ktype->child_ns_type(parent);
1028
1029 return ops;
1030}
1031
1032const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj)
1033{
1034 return kobj_child_ns_ops(kobj->parent);
1035}
1036
1037bool kobj_ns_current_may_mount(enum kobj_ns_type type)
1038{
1039 bool may_mount = true;
1040
1041 spin_lock(&kobj_ns_type_lock);
1042 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1043 kobj_ns_ops_tbl[type])
1044 may_mount = kobj_ns_ops_tbl[type]->current_may_mount();
1045 spin_unlock(&kobj_ns_type_lock);
1046
1047 return may_mount;
1048}
1049
1050void *kobj_ns_grab_current(enum kobj_ns_type type)
1051{
1052 void *ns = NULL;
1053
1054 spin_lock(&kobj_ns_type_lock);
1055 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1056 kobj_ns_ops_tbl[type])
1057 ns = kobj_ns_ops_tbl[type]->grab_current_ns();
1058 spin_unlock(&kobj_ns_type_lock);
1059
1060 return ns;
1061}
1062EXPORT_SYMBOL_GPL(kobj_ns_grab_current);
1063
1064const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk)
1065{
1066 const void *ns = NULL;
1067
1068 spin_lock(&kobj_ns_type_lock);
1069 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1070 kobj_ns_ops_tbl[type])
1071 ns = kobj_ns_ops_tbl[type]->netlink_ns(sk);
1072 spin_unlock(&kobj_ns_type_lock);
1073
1074 return ns;
1075}
1076
1077const void *kobj_ns_initial(enum kobj_ns_type type)
1078{
1079 const void *ns = NULL;
1080
1081 spin_lock(&kobj_ns_type_lock);
1082 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1083 kobj_ns_ops_tbl[type])
1084 ns = kobj_ns_ops_tbl[type]->initial_ns();
1085 spin_unlock(&kobj_ns_type_lock);
1086
1087 return ns;
1088}
1089
1090void kobj_ns_drop(enum kobj_ns_type type, void *ns)
1091{
1092 spin_lock(&kobj_ns_type_lock);
1093 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1094 kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns)
1095 kobj_ns_ops_tbl[type]->drop_ns(ns);
1096 spin_unlock(&kobj_ns_type_lock);
1097}
1098EXPORT_SYMBOL_GPL(kobj_ns_drop);
1099