Commit | Line | Data |
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d9d16e16 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * kobject.c - library routines for handling generic kernel objects | |
4 | * | |
5 | * Copyright (c) 2002-2003 Patrick Mochel <mochel@osdl.org> | |
f0e7e1bd GKH |
6 | * Copyright (c) 2006-2007 Greg Kroah-Hartman <greg@kroah.com> |
7 | * Copyright (c) 2006-2007 Novell Inc. | |
1da177e4 | 8 | * |
1da177e4 LT |
9 | * Please see the file Documentation/kobject.txt for critical information |
10 | * about using the kobject interface. | |
11 | */ | |
12 | ||
13 | #include <linux/kobject.h> | |
14 | #include <linux/string.h> | |
8bc3bcc9 | 15 | #include <linux/export.h> |
1da177e4 | 16 | #include <linux/stat.h> |
4e57b681 | 17 | #include <linux/slab.h> |
89c86a64 | 18 | #include <linux/random.h> |
1da177e4 | 19 | |
e34ff490 TH |
20 | /** |
21 | * kobject_namespace - return @kobj's namespace tag | |
22 | * @kobj: kobject in question | |
23 | * | |
24 | * Returns namespace tag of @kobj if its parent has namespace ops enabled | |
25 | * and thus @kobj should have a namespace tag associated with it. Returns | |
26 | * %NULL otherwise. | |
27 | */ | |
28 | const 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 | ||
a1212d27 | 35 | return kobj->ktype->namespace(kobj); |
e34ff490 TH |
36 | } |
37 | ||
e374a2bf GKH |
38 | /* |
39 | * populate_dir - populate directory with attributes. | |
40 | * @kobj: object we're working on. | |
1da177e4 | 41 | * |
e374a2bf GKH |
42 | * Most subsystems have a set of default attributes that are associated |
43 | * with an object that registers with them. This is a helper called during | |
44 | * object registration that loops through the default attributes of the | |
45 | * subsystem and creates attributes files for them in sysfs. | |
1da177e4 | 46 | */ |
e374a2bf | 47 | static int populate_dir(struct kobject *kobj) |
1da177e4 | 48 | { |
e374a2bf GKH |
49 | struct kobj_type *t = get_ktype(kobj); |
50 | struct attribute *attr; | |
1da177e4 LT |
51 | int error = 0; |
52 | int i; | |
e374a2bf | 53 | |
1da177e4 LT |
54 | if (t && t->default_attrs) { |
55 | for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) { | |
e374a2bf GKH |
56 | error = sysfs_create_file(kobj, attr); |
57 | if (error) | |
1da177e4 LT |
58 | break; |
59 | } | |
60 | } | |
61 | return error; | |
62 | } | |
63 | ||
e374a2bf | 64 | static int create_dir(struct kobject *kobj) |
1da177e4 | 65 | { |
c84a3b27 | 66 | const struct kobj_ns_type_operations *ops; |
e34ff490 TH |
67 | int error; |
68 | ||
69 | error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj)); | |
c84a3b27 TH |
70 | if (error) |
71 | return error; | |
72 | ||
73 | error = populate_dir(kobj); | |
74 | if (error) { | |
75 | sysfs_remove_dir(kobj); | |
76 | return error; | |
1da177e4 | 77 | } |
26ea12de TH |
78 | |
79 | /* | |
80 | * @kobj->sd may be deleted by an ancestor going away. Hold an | |
81 | * extra reference so that it stays until @kobj is gone. | |
82 | */ | |
83 | sysfs_get(kobj->sd); | |
84 | ||
c84a3b27 TH |
85 | /* |
86 | * If @kobj has ns_ops, its children need to be filtered based on | |
87 | * their namespace tags. Enable namespace support on @kobj->sd. | |
88 | */ | |
89 | ops = kobj_child_ns_ops(kobj); | |
90 | if (ops) { | |
91 | BUG_ON(ops->type <= KOBJ_NS_TYPE_NONE); | |
92 | BUG_ON(ops->type >= KOBJ_NS_TYPES); | |
93 | BUG_ON(!kobj_ns_type_registered(ops->type)); | |
94 | ||
fa4cd451 | 95 | sysfs_enable_ns(kobj->sd); |
c84a3b27 TH |
96 | } |
97 | ||
98 | return 0; | |
1da177e4 LT |
99 | } |
100 | ||
1da177e4 LT |
101 | static int get_kobj_path_length(struct kobject *kobj) |
102 | { | |
103 | int length = 1; | |
e374a2bf | 104 | struct kobject *parent = kobj; |
1da177e4 | 105 | |
e374a2bf | 106 | /* walk up the ancestors until we hit the one pointing to the |
1da177e4 LT |
107 | * root. |
108 | * Add 1 to strlen for leading '/' of each level. | |
109 | */ | |
110 | do { | |
b365b3da CE |
111 | if (kobject_name(parent) == NULL) |
112 | return 0; | |
1da177e4 LT |
113 | length += strlen(kobject_name(parent)) + 1; |
114 | parent = parent->parent; | |
115 | } while (parent); | |
116 | return length; | |
117 | } | |
118 | ||
119 | static void fill_kobj_path(struct kobject *kobj, char *path, int length) | |
120 | { | |
e374a2bf | 121 | struct kobject *parent; |
1da177e4 LT |
122 | |
123 | --length; | |
124 | for (parent = kobj; parent; parent = parent->parent) { | |
125 | int cur = strlen(kobject_name(parent)); | |
126 | /* back up enough to print this name with '/' */ | |
127 | length -= cur; | |
e374a2bf | 128 | strncpy(path + length, kobject_name(parent), cur); |
1da177e4 LT |
129 | *(path + --length) = '/'; |
130 | } | |
131 | ||
9f66fa2a | 132 | pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj), |
810304db | 133 | kobj, __func__, path); |
1da177e4 LT |
134 | } |
135 | ||
136 | /** | |
72fd4a35 | 137 | * kobject_get_path - generate and return the path associated with a given kobj and kset pair. |
1da177e4 LT |
138 | * |
139 | * @kobj: kobject in question, with which to build the path | |
140 | * @gfp_mask: the allocation type used to allocate the path | |
72fd4a35 RD |
141 | * |
142 | * The result must be freed by the caller with kfree(). | |
1da177e4 | 143 | */ |
fd4f2df2 | 144 | char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask) |
1da177e4 LT |
145 | { |
146 | char *path; | |
147 | int len; | |
148 | ||
149 | len = get_kobj_path_length(kobj); | |
b365b3da CE |
150 | if (len == 0) |
151 | return NULL; | |
4668edc3 | 152 | path = kzalloc(len, gfp_mask); |
1da177e4 LT |
153 | if (!path) |
154 | return NULL; | |
1da177e4 LT |
155 | fill_kobj_path(kobj, path, len); |
156 | ||
157 | return path; | |
158 | } | |
80fc9f53 | 159 | EXPORT_SYMBOL_GPL(kobject_get_path); |
1da177e4 | 160 | |
0f4dafc0 KS |
161 | /* add the kobject to its kset's list */ |
162 | static void kobj_kset_join(struct kobject *kobj) | |
1da177e4 | 163 | { |
0f4dafc0 | 164 | if (!kobj->kset) |
31b9025a | 165 | return; |
0f4dafc0 KS |
166 | |
167 | kset_get(kobj->kset); | |
168 | spin_lock(&kobj->kset->list_lock); | |
169 | list_add_tail(&kobj->entry, &kobj->kset->list); | |
170 | spin_unlock(&kobj->kset->list_lock); | |
1da177e4 LT |
171 | } |
172 | ||
0f4dafc0 KS |
173 | /* remove the kobject from its kset's list */ |
174 | static void kobj_kset_leave(struct kobject *kobj) | |
175 | { | |
176 | if (!kobj->kset) | |
177 | return; | |
1da177e4 | 178 | |
0f4dafc0 KS |
179 | spin_lock(&kobj->kset->list_lock); |
180 | list_del_init(&kobj->entry); | |
181 | spin_unlock(&kobj->kset->list_lock); | |
182 | kset_put(kobj->kset); | |
183 | } | |
1da177e4 | 184 | |
e374a2bf | 185 | static void kobject_init_internal(struct kobject *kobj) |
1da177e4 | 186 | { |
0f4dafc0 KS |
187 | if (!kobj) |
188 | return; | |
189 | kref_init(&kobj->kref); | |
190 | INIT_LIST_HEAD(&kobj->entry); | |
a4573c48 GKH |
191 | kobj->state_in_sysfs = 0; |
192 | kobj->state_add_uevent_sent = 0; | |
193 | kobj->state_remove_uevent_sent = 0; | |
194 | kobj->state_initialized = 1; | |
1da177e4 LT |
195 | } |
196 | ||
0f4dafc0 | 197 | |
9e7bbccd | 198 | static int kobject_add_internal(struct kobject *kobj) |
1da177e4 LT |
199 | { |
200 | int error = 0; | |
e374a2bf | 201 | struct kobject *parent; |
1da177e4 | 202 | |
0f4dafc0 | 203 | if (!kobj) |
1da177e4 | 204 | return -ENOENT; |
0f4dafc0 | 205 | |
af5ca3f4 | 206 | if (!kobj->name || !kobj->name[0]) { |
82d1f117 AS |
207 | WARN(1, |
208 | "kobject: (%p): attempted to be registered with empty name!\n", | |
209 | kobj); | |
c171fef5 GKH |
210 | return -EINVAL; |
211 | } | |
1da177e4 | 212 | |
0f4dafc0 | 213 | parent = kobject_get(kobj->parent); |
1da177e4 | 214 | |
0f4dafc0 | 215 | /* join kset if set, use it as parent if we do not already have one */ |
1da177e4 | 216 | if (kobj->kset) { |
0f4dafc0 | 217 | if (!parent) |
1da177e4 | 218 | parent = kobject_get(&kobj->kset->kobj); |
0f4dafc0 | 219 | kobj_kset_join(kobj); |
460f7e9a | 220 | kobj->parent = parent; |
1da177e4 | 221 | } |
1da177e4 | 222 | |
0f4dafc0 | 223 | pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n", |
810304db | 224 | kobject_name(kobj), kobj, __func__, |
0f4dafc0 | 225 | parent ? kobject_name(parent) : "<NULL>", |
e374a2bf | 226 | kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>"); |
0f4dafc0 | 227 | |
90bc6135 | 228 | error = create_dir(kobj); |
1da177e4 | 229 | if (error) { |
0f4dafc0 KS |
230 | kobj_kset_leave(kobj); |
231 | kobject_put(parent); | |
232 | kobj->parent = NULL; | |
dcd0da00 GKH |
233 | |
234 | /* be noisy on error issues */ | |
235 | if (error == -EEXIST) | |
3e14c6ab DV |
236 | pr_err("%s failed for %s with -EEXIST, don't try to register things with the same name in the same directory.\n", |
237 | __func__, kobject_name(kobj)); | |
dcd0da00 | 238 | else |
3e14c6ab DV |
239 | pr_err("%s failed for %s (error: %d parent: %s)\n", |
240 | __func__, kobject_name(kobj), error, | |
241 | parent ? kobject_name(parent) : "'none'"); | |
0f4dafc0 KS |
242 | } else |
243 | kobj->state_in_sysfs = 1; | |
1da177e4 LT |
244 | |
245 | return error; | |
246 | } | |
247 | ||
663a4743 GKH |
248 | /** |
249 | * kobject_set_name_vargs - Set the name of an kobject | |
250 | * @kobj: struct kobject to set the name of | |
251 | * @fmt: format string used to build the name | |
252 | * @vargs: vargs to format the string. | |
253 | */ | |
1fa5ae85 | 254 | int kobject_set_name_vargs(struct kobject *kobj, const char *fmt, |
663a4743 GKH |
255 | va_list vargs) |
256 | { | |
f773f32d | 257 | const char *s; |
663a4743 | 258 | |
8a577ffc KS |
259 | if (kobj->name && !fmt) |
260 | return 0; | |
261 | ||
f773f32d | 262 | s = kvasprintf_const(GFP_KERNEL, fmt, vargs); |
2abf114f | 263 | if (!s) |
a4ca6617 | 264 | return -ENOMEM; |
663a4743 | 265 | |
f773f32d RV |
266 | /* |
267 | * ewww... some of these buggers have '/' in the name ... If | |
268 | * that's the case, we need to make sure we have an actual | |
269 | * allocated copy to modify, since kvasprintf_const may have | |
270 | * returned something from .rodata. | |
271 | */ | |
272 | if (strchr(s, '/')) { | |
273 | char *t; | |
274 | ||
275 | t = kstrdup(s, GFP_KERNEL); | |
276 | kfree_const(s); | |
277 | if (!t) | |
278 | return -ENOMEM; | |
279 | strreplace(t, '/', '!'); | |
280 | s = t; | |
281 | } | |
282 | kfree_const(kobj->name); | |
2abf114f | 283 | kobj->name = s; |
9f255651 | 284 | |
663a4743 GKH |
285 | return 0; |
286 | } | |
1da177e4 LT |
287 | |
288 | /** | |
8c4606b1 | 289 | * kobject_set_name - Set the name of a kobject |
663a4743 | 290 | * @kobj: struct kobject to set the name of |
8c4606b1 | 291 | * @fmt: format string used to build the name |
1da177e4 | 292 | * |
8c4606b1 GKH |
293 | * This sets the name of the kobject. If you have already added the |
294 | * kobject to the system, you must call kobject_rename() in order to | |
295 | * change the name of the kobject. | |
1da177e4 | 296 | */ |
663a4743 | 297 | int kobject_set_name(struct kobject *kobj, const char *fmt, ...) |
1da177e4 | 298 | { |
a4ca6617 | 299 | va_list vargs; |
663a4743 | 300 | int retval; |
1da177e4 | 301 | |
a4ca6617 KS |
302 | va_start(vargs, fmt); |
303 | retval = kobject_set_name_vargs(kobj, fmt, vargs); | |
304 | va_end(vargs); | |
1da177e4 | 305 | |
663a4743 | 306 | return retval; |
1da177e4 | 307 | } |
1da177e4 LT |
308 | EXPORT_SYMBOL(kobject_set_name); |
309 | ||
e86000d0 | 310 | /** |
f9cb074b | 311 | * kobject_init - initialize a kobject structure |
e86000d0 GKH |
312 | * @kobj: pointer to the kobject to initialize |
313 | * @ktype: pointer to the ktype for this kobject. | |
314 | * | |
315 | * This function will properly initialize a kobject such that it can then | |
316 | * be passed to the kobject_add() call. | |
317 | * | |
318 | * After this function is called, the kobject MUST be cleaned up by a call | |
319 | * to kobject_put(), not by a call to kfree directly to ensure that all of | |
320 | * the memory is cleaned up properly. | |
321 | */ | |
f9cb074b | 322 | void kobject_init(struct kobject *kobj, struct kobj_type *ktype) |
e86000d0 GKH |
323 | { |
324 | char *err_str; | |
325 | ||
326 | if (!kobj) { | |
327 | err_str = "invalid kobject pointer!"; | |
328 | goto error; | |
329 | } | |
330 | if (!ktype) { | |
331 | err_str = "must have a ktype to be initialized properly!\n"; | |
332 | goto error; | |
333 | } | |
0f4dafc0 | 334 | if (kobj->state_initialized) { |
e86000d0 | 335 | /* do not error out as sometimes we can recover */ |
82d1f117 AS |
336 | pr_err("kobject (%p): tried to init an initialized object, something is seriously wrong.\n", |
337 | kobj); | |
e86000d0 GKH |
338 | dump_stack(); |
339 | } | |
340 | ||
a4573c48 | 341 | kobject_init_internal(kobj); |
e86000d0 GKH |
342 | kobj->ktype = ktype; |
343 | return; | |
344 | ||
345 | error: | |
82d1f117 | 346 | pr_err("kobject (%p): %s\n", kobj, err_str); |
e86000d0 GKH |
347 | dump_stack(); |
348 | } | |
f9cb074b | 349 | EXPORT_SYMBOL(kobject_init); |
e86000d0 | 350 | |
8db14860 NI |
351 | static __printf(3, 0) int kobject_add_varg(struct kobject *kobj, |
352 | struct kobject *parent, | |
353 | const char *fmt, va_list vargs) | |
244f6cee | 354 | { |
244f6cee GKH |
355 | int retval; |
356 | ||
a4ca6617 | 357 | retval = kobject_set_name_vargs(kobj, fmt, vargs); |
244f6cee | 358 | if (retval) { |
82d1f117 | 359 | pr_err("kobject: can not set name properly!\n"); |
244f6cee GKH |
360 | return retval; |
361 | } | |
362 | kobj->parent = parent; | |
9e7bbccd | 363 | return kobject_add_internal(kobj); |
244f6cee GKH |
364 | } |
365 | ||
366 | /** | |
b2d6db58 | 367 | * kobject_add - the main kobject add function |
244f6cee GKH |
368 | * @kobj: the kobject to add |
369 | * @parent: pointer to the parent of the kobject. | |
370 | * @fmt: format to name the kobject with. | |
371 | * | |
372 | * The kobject name is set and added to the kobject hierarchy in this | |
373 | * function. | |
374 | * | |
375 | * If @parent is set, then the parent of the @kobj will be set to it. | |
376 | * If @parent is NULL, then the parent of the @kobj will be set to the | |
9705710e | 377 | * kobject associated with the kset assigned to this kobject. If no kset |
244f6cee GKH |
378 | * is assigned to the kobject, then the kobject will be located in the |
379 | * root of the sysfs tree. | |
380 | * | |
381 | * If this function returns an error, kobject_put() must be called to | |
382 | * properly clean up the memory associated with the object. | |
244f6cee GKH |
383 | * Under no instance should the kobject that is passed to this function |
384 | * be directly freed with a call to kfree(), that can leak memory. | |
385 | * | |
0f4dafc0 | 386 | * Note, no "add" uevent will be created with this call, the caller should set |
244f6cee GKH |
387 | * up all of the necessary sysfs files for the object and then call |
388 | * kobject_uevent() with the UEVENT_ADD parameter to ensure that | |
389 | * userspace is properly notified of this kobject's creation. | |
390 | */ | |
b2d6db58 GKH |
391 | int kobject_add(struct kobject *kobj, struct kobject *parent, |
392 | const char *fmt, ...) | |
244f6cee GKH |
393 | { |
394 | va_list args; | |
395 | int retval; | |
396 | ||
397 | if (!kobj) | |
398 | return -EINVAL; | |
399 | ||
0f4dafc0 | 400 | if (!kobj->state_initialized) { |
82d1f117 | 401 | pr_err("kobject '%s' (%p): tried to add an uninitialized object, something is seriously wrong.\n", |
0f4dafc0 KS |
402 | kobject_name(kobj), kobj); |
403 | dump_stack(); | |
404 | return -EINVAL; | |
405 | } | |
244f6cee GKH |
406 | va_start(args, fmt); |
407 | retval = kobject_add_varg(kobj, parent, fmt, args); | |
408 | va_end(args); | |
409 | ||
410 | return retval; | |
411 | } | |
b2d6db58 | 412 | EXPORT_SYMBOL(kobject_add); |
244f6cee | 413 | |
c11c4154 GKH |
414 | /** |
415 | * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy | |
416 | * @kobj: pointer to the kobject to initialize | |
417 | * @ktype: pointer to the ktype for this kobject. | |
418 | * @parent: pointer to the parent of this kobject. | |
419 | * @fmt: the name of the kobject. | |
420 | * | |
f9cb074b | 421 | * This function combines the call to kobject_init() and |
b2d6db58 GKH |
422 | * kobject_add(). The same type of error handling after a call to |
423 | * kobject_add() and kobject lifetime rules are the same here. | |
c11c4154 GKH |
424 | */ |
425 | int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype, | |
426 | struct kobject *parent, const char *fmt, ...) | |
427 | { | |
428 | va_list args; | |
429 | int retval; | |
430 | ||
f9cb074b | 431 | kobject_init(kobj, ktype); |
c11c4154 GKH |
432 | |
433 | va_start(args, fmt); | |
434 | retval = kobject_add_varg(kobj, parent, fmt, args); | |
435 | va_end(args); | |
436 | ||
437 | return retval; | |
438 | } | |
439 | EXPORT_SYMBOL_GPL(kobject_init_and_add); | |
440 | ||
1da177e4 | 441 | /** |
e374a2bf GKH |
442 | * kobject_rename - change the name of an object |
443 | * @kobj: object in question. | |
444 | * @new_name: object's new name | |
030c1d2b EB |
445 | * |
446 | * It is the responsibility of the caller to provide mutual | |
447 | * exclusion between two different calls of kobject_rename | |
448 | * on the same kobject and to ensure that new_name is valid and | |
449 | * won't conflict with other kobjects. | |
1da177e4 | 450 | */ |
e374a2bf | 451 | int kobject_rename(struct kobject *kobj, const char *new_name) |
1da177e4 LT |
452 | { |
453 | int error = 0; | |
ca2f37db | 454 | const char *devpath = NULL; |
0b4a4fea | 455 | const char *dup_name = NULL, *name; |
ca2f37db JT |
456 | char *devpath_string = NULL; |
457 | char *envp[2]; | |
1da177e4 LT |
458 | |
459 | kobj = kobject_get(kobj); | |
460 | if (!kobj) | |
461 | return -EINVAL; | |
b592fcfe EB |
462 | if (!kobj->parent) |
463 | return -EINVAL; | |
ca2f37db JT |
464 | |
465 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
466 | if (!devpath) { | |
467 | error = -ENOMEM; | |
468 | goto out; | |
469 | } | |
470 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
471 | if (!devpath_string) { | |
472 | error = -ENOMEM; | |
473 | goto out; | |
474 | } | |
475 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
476 | envp[0] = devpath_string; | |
477 | envp[1] = NULL; | |
ca2f37db | 478 | |
f773f32d | 479 | name = dup_name = kstrdup_const(new_name, GFP_KERNEL); |
0b4a4fea EB |
480 | if (!name) { |
481 | error = -ENOMEM; | |
482 | goto out; | |
483 | } | |
484 | ||
e34ff490 | 485 | error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj)); |
0b4a4fea EB |
486 | if (error) |
487 | goto out; | |
488 | ||
489 | /* Install the new kobject name */ | |
490 | dup_name = kobj->name; | |
491 | kobj->name = name; | |
ca2f37db JT |
492 | |
493 | /* This function is mostly/only used for network interface. | |
494 | * Some hotplug package track interfaces by their name and | |
495 | * therefore want to know when the name is changed by the user. */ | |
0b4a4fea | 496 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); |
ca2f37db JT |
497 | |
498 | out: | |
f773f32d | 499 | kfree_const(dup_name); |
ca2f37db JT |
500 | kfree(devpath_string); |
501 | kfree(devpath); | |
b592fcfe EB |
502 | kobject_put(kobj); |
503 | ||
504 | return error; | |
505 | } | |
8344b568 | 506 | EXPORT_SYMBOL_GPL(kobject_rename); |
b592fcfe | 507 | |
8a82472f | 508 | /** |
e374a2bf GKH |
509 | * kobject_move - move object to another parent |
510 | * @kobj: object in question. | |
511 | * @new_parent: object's new parent (can be NULL) | |
8a82472f | 512 | */ |
8a82472f CH |
513 | int kobject_move(struct kobject *kobj, struct kobject *new_parent) |
514 | { | |
515 | int error; | |
516 | struct kobject *old_parent; | |
517 | const char *devpath = NULL; | |
518 | char *devpath_string = NULL; | |
519 | char *envp[2]; | |
520 | ||
521 | kobj = kobject_get(kobj); | |
522 | if (!kobj) | |
523 | return -EINVAL; | |
524 | new_parent = kobject_get(new_parent); | |
525 | if (!new_parent) { | |
c744aeae CH |
526 | if (kobj->kset) |
527 | new_parent = kobject_get(&kobj->kset->kobj); | |
8a82472f | 528 | } |
e34ff490 | 529 | |
8a82472f CH |
530 | /* old object path */ |
531 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
532 | if (!devpath) { | |
533 | error = -ENOMEM; | |
534 | goto out; | |
535 | } | |
536 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
537 | if (!devpath_string) { | |
538 | error = -ENOMEM; | |
539 | goto out; | |
540 | } | |
541 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
542 | envp[0] = devpath_string; | |
543 | envp[1] = NULL; | |
e34ff490 | 544 | error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj)); |
8a82472f CH |
545 | if (error) |
546 | goto out; | |
547 | old_parent = kobj->parent; | |
548 | kobj->parent = new_parent; | |
9e993efb | 549 | new_parent = NULL; |
8a82472f CH |
550 | kobject_put(old_parent); |
551 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); | |
552 | out: | |
9e993efb | 553 | kobject_put(new_parent); |
8a82472f CH |
554 | kobject_put(kobj); |
555 | kfree(devpath_string); | |
556 | kfree(devpath); | |
557 | return error; | |
558 | } | |
24199d20 | 559 | EXPORT_SYMBOL_GPL(kobject_move); |
8a82472f | 560 | |
1da177e4 | 561 | /** |
e374a2bf GKH |
562 | * kobject_del - unlink kobject from hierarchy. |
563 | * @kobj: object. | |
1da177e4 | 564 | */ |
e374a2bf | 565 | void kobject_del(struct kobject *kobj) |
1da177e4 | 566 | { |
324a56e1 | 567 | struct kernfs_node *sd; |
26ea12de | 568 | |
31b9025a GKH |
569 | if (!kobj) |
570 | return; | |
0f4dafc0 | 571 | |
26ea12de | 572 | sd = kobj->sd; |
1da177e4 | 573 | sysfs_remove_dir(kobj); |
26ea12de TH |
574 | sysfs_put(sd); |
575 | ||
0f4dafc0 KS |
576 | kobj->state_in_sysfs = 0; |
577 | kobj_kset_leave(kobj); | |
578 | kobject_put(kobj->parent); | |
579 | kobj->parent = NULL; | |
1da177e4 | 580 | } |
fa40ae34 | 581 | EXPORT_SYMBOL(kobject_del); |
1da177e4 | 582 | |
1da177e4 | 583 | /** |
e374a2bf GKH |
584 | * kobject_get - increment refcount for object. |
585 | * @kobj: object. | |
1da177e4 | 586 | */ |
e374a2bf | 587 | struct kobject *kobject_get(struct kobject *kobj) |
1da177e4 | 588 | { |
d82d54af EZ |
589 | if (kobj) { |
590 | if (!kobj->state_initialized) | |
82d1f117 AS |
591 | WARN(1, KERN_WARNING |
592 | "kobject: '%s' (%p): is not initialized, yet kobject_get() is being called.\n", | |
593 | kobject_name(kobj), kobj); | |
1da177e4 | 594 | kref_get(&kobj->kref); |
d82d54af | 595 | } |
1da177e4 LT |
596 | return kobj; |
597 | } | |
fa40ae34 | 598 | EXPORT_SYMBOL(kobject_get); |
1da177e4 | 599 | |
c70c176f | 600 | struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj) |
a49b7e82 | 601 | { |
c70c176f JK |
602 | if (!kobj) |
603 | return NULL; | |
a49b7e82 LT |
604 | if (!kref_get_unless_zero(&kobj->kref)) |
605 | kobj = NULL; | |
606 | return kobj; | |
607 | } | |
c70c176f | 608 | EXPORT_SYMBOL(kobject_get_unless_zero); |
a49b7e82 | 609 | |
18041f47 GKH |
610 | /* |
611 | * kobject_cleanup - free kobject resources. | |
612 | * @kobj: object to cleanup | |
1da177e4 | 613 | */ |
18041f47 | 614 | static void kobject_cleanup(struct kobject *kobj) |
1da177e4 | 615 | { |
0f4dafc0 | 616 | struct kobj_type *t = get_ktype(kobj); |
af5ca3f4 | 617 | const char *name = kobj->name; |
1da177e4 | 618 | |
c817a67e RK |
619 | pr_debug("kobject: '%s' (%p): %s, parent %p\n", |
620 | kobject_name(kobj), kobj, __func__, kobj->parent); | |
0f4dafc0 KS |
621 | |
622 | if (t && !t->release) | |
82d1f117 | 623 | pr_debug("kobject: '%s' (%p): does not have a release() function, it is broken and must be fixed.\n", |
0f4dafc0 KS |
624 | kobject_name(kobj), kobj); |
625 | ||
626 | /* send "remove" if the caller did not do it but sent "add" */ | |
627 | if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) { | |
628 | pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n", | |
629 | kobject_name(kobj), kobj); | |
630 | kobject_uevent(kobj, KOBJ_REMOVE); | |
631 | } | |
632 | ||
633 | /* remove from sysfs if the caller did not do it */ | |
634 | if (kobj->state_in_sysfs) { | |
635 | pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n", | |
636 | kobject_name(kobj), kobj); | |
637 | kobject_del(kobj); | |
638 | } | |
639 | ||
ce2c9cb0 | 640 | if (t && t->release) { |
0f4dafc0 KS |
641 | pr_debug("kobject: '%s' (%p): calling ktype release\n", |
642 | kobject_name(kobj), kobj); | |
1da177e4 | 643 | t->release(kobj); |
0f4dafc0 KS |
644 | } |
645 | ||
646 | /* free name if we allocated it */ | |
af5ca3f4 | 647 | if (name) { |
0f4dafc0 | 648 | pr_debug("kobject: '%s': free name\n", name); |
f773f32d | 649 | kfree_const(name); |
ce2c9cb0 | 650 | } |
1da177e4 LT |
651 | } |
652 | ||
c817a67e RK |
653 | #ifdef CONFIG_DEBUG_KOBJECT_RELEASE |
654 | static void kobject_delayed_cleanup(struct work_struct *work) | |
655 | { | |
656 | kobject_cleanup(container_of(to_delayed_work(work), | |
657 | struct kobject, release)); | |
658 | } | |
659 | #endif | |
660 | ||
1da177e4 LT |
661 | static void kobject_release(struct kref *kref) |
662 | { | |
c817a67e RK |
663 | struct kobject *kobj = container_of(kref, struct kobject, kref); |
664 | #ifdef CONFIG_DEBUG_KOBJECT_RELEASE | |
89c86a64 BH |
665 | unsigned long delay = HZ + HZ * (get_random_int() & 0x3); |
666 | pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n", | |
667 | kobject_name(kobj), kobj, __func__, kobj->parent, delay); | |
c817a67e | 668 | INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup); |
89c86a64 BH |
669 | |
670 | schedule_delayed_work(&kobj->release, delay); | |
c817a67e RK |
671 | #else |
672 | kobject_cleanup(kobj); | |
673 | #endif | |
1da177e4 LT |
674 | } |
675 | ||
676 | /** | |
e374a2bf GKH |
677 | * kobject_put - decrement refcount for object. |
678 | * @kobj: object. | |
1da177e4 | 679 | * |
e374a2bf | 680 | * Decrement the refcount, and if 0, call kobject_cleanup(). |
1da177e4 | 681 | */ |
e374a2bf | 682 | void kobject_put(struct kobject *kobj) |
1da177e4 | 683 | { |
c1ebdae5 | 684 | if (kobj) { |
d955c78a | 685 | if (!kobj->state_initialized) |
82d1f117 AS |
686 | WARN(1, KERN_WARNING |
687 | "kobject: '%s' (%p): is not initialized, yet kobject_put() is being called.\n", | |
688 | kobject_name(kobj), kobj); | |
1da177e4 | 689 | kref_put(&kobj->kref, kobject_release); |
c1ebdae5 | 690 | } |
1da177e4 | 691 | } |
fa40ae34 | 692 | EXPORT_SYMBOL(kobject_put); |
1da177e4 | 693 | |
3f9e3ee9 | 694 | static void dynamic_kobj_release(struct kobject *kobj) |
7423172a | 695 | { |
810304db | 696 | pr_debug("kobject: (%p): %s\n", kobj, __func__); |
7423172a JN |
697 | kfree(kobj); |
698 | } | |
699 | ||
3f9e3ee9 | 700 | static struct kobj_type dynamic_kobj_ktype = { |
386f275f KS |
701 | .release = dynamic_kobj_release, |
702 | .sysfs_ops = &kobj_sysfs_ops, | |
7423172a JN |
703 | }; |
704 | ||
43968d2f | 705 | /** |
3f9e3ee9 GKH |
706 | * kobject_create - create a struct kobject dynamically |
707 | * | |
708 | * This function creates a kobject structure dynamically and sets it up | |
709 | * to be a "dynamic" kobject with a default release function set up. | |
710 | * | |
711 | * If the kobject was not able to be created, NULL will be returned. | |
43968d2f | 712 | * The kobject structure returned from here must be cleaned up with a |
f9cb074b | 713 | * call to kobject_put() and not kfree(), as kobject_init() has |
43968d2f | 714 | * already been called on this structure. |
3f9e3ee9 | 715 | */ |
43968d2f | 716 | struct kobject *kobject_create(void) |
3f9e3ee9 GKH |
717 | { |
718 | struct kobject *kobj; | |
719 | ||
720 | kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); | |
721 | if (!kobj) | |
722 | return NULL; | |
723 | ||
f9cb074b | 724 | kobject_init(kobj, &dynamic_kobj_ktype); |
3f9e3ee9 GKH |
725 | return kobj; |
726 | } | |
727 | ||
728 | /** | |
729 | * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs | |
730 | * | |
9ff1f838 | 731 | * @name: the name for the kobject |
3f9e3ee9 GKH |
732 | * @parent: the parent kobject of this kobject, if any. |
733 | * | |
f70701a3 | 734 | * This function creates a kobject structure dynamically and registers it |
3f9e3ee9 | 735 | * with sysfs. When you are finished with this structure, call |
78a2d906 | 736 | * kobject_put() and the structure will be dynamically freed when |
3f9e3ee9 GKH |
737 | * it is no longer being used. |
738 | * | |
739 | * If the kobject was not able to be created, NULL will be returned. | |
740 | */ | |
741 | struct kobject *kobject_create_and_add(const char *name, struct kobject *parent) | |
742 | { | |
743 | struct kobject *kobj; | |
744 | int retval; | |
745 | ||
746 | kobj = kobject_create(); | |
747 | if (!kobj) | |
748 | return NULL; | |
749 | ||
b2d6db58 | 750 | retval = kobject_add(kobj, parent, "%s", name); |
3f9e3ee9 | 751 | if (retval) { |
82d1f117 | 752 | pr_warn("%s: kobject_add error: %d\n", __func__, retval); |
3f9e3ee9 GKH |
753 | kobject_put(kobj); |
754 | kobj = NULL; | |
755 | } | |
756 | return kobj; | |
757 | } | |
758 | EXPORT_SYMBOL_GPL(kobject_create_and_add); | |
759 | ||
1da177e4 | 760 | /** |
e374a2bf GKH |
761 | * kset_init - initialize a kset for use |
762 | * @k: kset | |
1da177e4 | 763 | */ |
e374a2bf | 764 | void kset_init(struct kset *k) |
1da177e4 | 765 | { |
e1543ddf | 766 | kobject_init_internal(&k->kobj); |
1da177e4 LT |
767 | INIT_LIST_HEAD(&k->list); |
768 | spin_lock_init(&k->list_lock); | |
769 | } | |
770 | ||
23b5212c KS |
771 | /* default kobject attribute operations */ |
772 | static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr, | |
773 | char *buf) | |
774 | { | |
775 | struct kobj_attribute *kattr; | |
776 | ssize_t ret = -EIO; | |
777 | ||
778 | kattr = container_of(attr, struct kobj_attribute, attr); | |
779 | if (kattr->show) | |
780 | ret = kattr->show(kobj, kattr, buf); | |
781 | return ret; | |
782 | } | |
783 | ||
784 | static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr, | |
785 | const char *buf, size_t count) | |
786 | { | |
787 | struct kobj_attribute *kattr; | |
788 | ssize_t ret = -EIO; | |
789 | ||
790 | kattr = container_of(attr, struct kobj_attribute, attr); | |
791 | if (kattr->store) | |
792 | ret = kattr->store(kobj, kattr, buf, count); | |
793 | return ret; | |
794 | } | |
795 | ||
52cf25d0 | 796 | const struct sysfs_ops kobj_sysfs_ops = { |
23b5212c KS |
797 | .show = kobj_attr_show, |
798 | .store = kobj_attr_store, | |
799 | }; | |
29dfe2dc | 800 | EXPORT_SYMBOL_GPL(kobj_sysfs_ops); |
1da177e4 | 801 | |
1da177e4 | 802 | /** |
e374a2bf GKH |
803 | * kset_register - initialize and add a kset. |
804 | * @k: kset. | |
1da177e4 | 805 | */ |
e374a2bf | 806 | int kset_register(struct kset *k) |
1da177e4 | 807 | { |
80f03e34 KS |
808 | int err; |
809 | ||
31b9025a GKH |
810 | if (!k) |
811 | return -EINVAL; | |
80f03e34 | 812 | |
1da177e4 | 813 | kset_init(k); |
12e339ac | 814 | err = kobject_add_internal(&k->kobj); |
80f03e34 KS |
815 | if (err) |
816 | return err; | |
817 | kobject_uevent(&k->kobj, KOBJ_ADD); | |
818 | return 0; | |
1da177e4 | 819 | } |
fa40ae34 | 820 | EXPORT_SYMBOL(kset_register); |
1da177e4 | 821 | |
1da177e4 | 822 | /** |
e374a2bf GKH |
823 | * kset_unregister - remove a kset. |
824 | * @k: kset. | |
1da177e4 | 825 | */ |
e374a2bf | 826 | void kset_unregister(struct kset *k) |
1da177e4 | 827 | { |
31b9025a GKH |
828 | if (!k) |
829 | return; | |
35a5fe69 | 830 | kobject_del(&k->kobj); |
78a2d906 | 831 | kobject_put(&k->kobj); |
1da177e4 | 832 | } |
fa40ae34 | 833 | EXPORT_SYMBOL(kset_unregister); |
1da177e4 | 834 | |
1da177e4 | 835 | /** |
e374a2bf GKH |
836 | * kset_find_obj - search for object in kset. |
837 | * @kset: kset we're looking in. | |
838 | * @name: object's name. | |
1da177e4 | 839 | * |
e374a2bf GKH |
840 | * Lock kset via @kset->subsys, and iterate over @kset->list, |
841 | * looking for a matching kobject. If matching object is found | |
842 | * take a reference and return the object. | |
1da177e4 | 843 | */ |
e374a2bf | 844 | struct kobject *kset_find_obj(struct kset *kset, const char *name) |
1da177e4 | 845 | { |
c6a2a3dc | 846 | struct kobject *k; |
e374a2bf | 847 | struct kobject *ret = NULL; |
1da177e4 LT |
848 | |
849 | spin_lock(&kset->list_lock); | |
c25d1dfb | 850 | |
c6a2a3dc | 851 | list_for_each_entry(k, &kset->list, entry) { |
e374a2bf | 852 | if (kobject_name(k) && !strcmp(kobject_name(k), name)) { |
a49b7e82 | 853 | ret = kobject_get_unless_zero(k); |
1da177e4 LT |
854 | break; |
855 | } | |
856 | } | |
c25d1dfb | 857 | |
1da177e4 LT |
858 | spin_unlock(&kset->list_lock); |
859 | return ret; | |
860 | } | |
2fe829ac | 861 | EXPORT_SYMBOL_GPL(kset_find_obj); |
1da177e4 | 862 | |
b727c702 GKH |
863 | static void kset_release(struct kobject *kobj) |
864 | { | |
865 | struct kset *kset = container_of(kobj, struct kset, kobj); | |
9f66fa2a | 866 | pr_debug("kobject: '%s' (%p): %s\n", |
810304db | 867 | kobject_name(kobj), kobj, __func__); |
b727c702 GKH |
868 | kfree(kset); |
869 | } | |
870 | ||
386f275f KS |
871 | static struct kobj_type kset_ktype = { |
872 | .sysfs_ops = &kobj_sysfs_ops, | |
b727c702 GKH |
873 | .release = kset_release, |
874 | }; | |
875 | ||
876 | /** | |
877 | * kset_create - create a struct kset dynamically | |
878 | * | |
879 | * @name: the name for the kset | |
880 | * @uevent_ops: a struct kset_uevent_ops for the kset | |
881 | * @parent_kobj: the parent kobject of this kset, if any. | |
882 | * | |
883 | * This function creates a kset structure dynamically. This structure can | |
884 | * then be registered with the system and show up in sysfs with a call to | |
885 | * kset_register(). When you are finished with this structure, if | |
886 | * kset_register() has been called, call kset_unregister() and the | |
887 | * structure will be dynamically freed when it is no longer being used. | |
888 | * | |
889 | * If the kset was not able to be created, NULL will be returned. | |
890 | */ | |
891 | static struct kset *kset_create(const char *name, | |
9cd43611 | 892 | const struct kset_uevent_ops *uevent_ops, |
b727c702 GKH |
893 | struct kobject *parent_kobj) |
894 | { | |
895 | struct kset *kset; | |
d9cd8f37 | 896 | int retval; |
b727c702 GKH |
897 | |
898 | kset = kzalloc(sizeof(*kset), GFP_KERNEL); | |
899 | if (!kset) | |
900 | return NULL; | |
b7165ebb | 901 | retval = kobject_set_name(&kset->kobj, "%s", name); |
d9cd8f37 DY |
902 | if (retval) { |
903 | kfree(kset); | |
904 | return NULL; | |
905 | } | |
b727c702 GKH |
906 | kset->uevent_ops = uevent_ops; |
907 | kset->kobj.parent = parent_kobj; | |
908 | ||
909 | /* | |
386f275f | 910 | * The kobject of this kset will have a type of kset_ktype and belong to |
b727c702 GKH |
911 | * no kset itself. That way we can properly free it when it is |
912 | * finished being used. | |
913 | */ | |
386f275f | 914 | kset->kobj.ktype = &kset_ktype; |
b727c702 GKH |
915 | kset->kobj.kset = NULL; |
916 | ||
917 | return kset; | |
918 | } | |
919 | ||
920 | /** | |
921 | * kset_create_and_add - create a struct kset dynamically and add it to sysfs | |
922 | * | |
923 | * @name: the name for the kset | |
924 | * @uevent_ops: a struct kset_uevent_ops for the kset | |
925 | * @parent_kobj: the parent kobject of this kset, if any. | |
926 | * | |
927 | * This function creates a kset structure dynamically and registers it | |
928 | * with sysfs. When you are finished with this structure, call | |
929 | * kset_unregister() and the structure will be dynamically freed when it | |
930 | * is no longer being used. | |
931 | * | |
932 | * If the kset was not able to be created, NULL will be returned. | |
933 | */ | |
934 | struct kset *kset_create_and_add(const char *name, | |
9cd43611 | 935 | const struct kset_uevent_ops *uevent_ops, |
b727c702 GKH |
936 | struct kobject *parent_kobj) |
937 | { | |
938 | struct kset *kset; | |
939 | int error; | |
940 | ||
941 | kset = kset_create(name, uevent_ops, parent_kobj); | |
942 | if (!kset) | |
943 | return NULL; | |
944 | error = kset_register(kset); | |
945 | if (error) { | |
946 | kfree(kset); | |
947 | return NULL; | |
948 | } | |
949 | return kset; | |
950 | } | |
951 | EXPORT_SYMBOL_GPL(kset_create_and_add); | |
952 | ||
bc451f20 EB |
953 | |
954 | static DEFINE_SPINLOCK(kobj_ns_type_lock); | |
955 | static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES]; | |
956 | ||
957 | int kobj_ns_type_register(const struct kobj_ns_type_operations *ops) | |
958 | { | |
959 | enum kobj_ns_type type = ops->type; | |
960 | int error; | |
961 | ||
962 | spin_lock(&kobj_ns_type_lock); | |
963 | ||
964 | error = -EINVAL; | |
965 | if (type >= KOBJ_NS_TYPES) | |
966 | goto out; | |
967 | ||
968 | error = -EINVAL; | |
969 | if (type <= KOBJ_NS_TYPE_NONE) | |
970 | goto out; | |
971 | ||
972 | error = -EBUSY; | |
973 | if (kobj_ns_ops_tbl[type]) | |
974 | goto out; | |
975 | ||
976 | error = 0; | |
977 | kobj_ns_ops_tbl[type] = ops; | |
978 | ||
979 | out: | |
980 | spin_unlock(&kobj_ns_type_lock); | |
981 | return error; | |
982 | } | |
983 | ||
984 | int kobj_ns_type_registered(enum kobj_ns_type type) | |
985 | { | |
986 | int registered = 0; | |
987 | ||
988 | spin_lock(&kobj_ns_type_lock); | |
989 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES)) | |
990 | registered = kobj_ns_ops_tbl[type] != NULL; | |
991 | spin_unlock(&kobj_ns_type_lock); | |
992 | ||
993 | return registered; | |
994 | } | |
995 | ||
996 | const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent) | |
997 | { | |
998 | const struct kobj_ns_type_operations *ops = NULL; | |
999 | ||
41fb96a4 | 1000 | if (parent && parent->ktype && parent->ktype->child_ns_type) |
bc451f20 EB |
1001 | ops = parent->ktype->child_ns_type(parent); |
1002 | ||
1003 | return ops; | |
1004 | } | |
1005 | ||
1006 | const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj) | |
1007 | { | |
1008 | return kobj_child_ns_ops(kobj->parent); | |
1009 | } | |
1010 | ||
7dc5dbc8 EB |
1011 | bool kobj_ns_current_may_mount(enum kobj_ns_type type) |
1012 | { | |
730d7d33 | 1013 | bool may_mount = true; |
7dc5dbc8 EB |
1014 | |
1015 | spin_lock(&kobj_ns_type_lock); | |
1016 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1017 | kobj_ns_ops_tbl[type]) | |
1018 | may_mount = kobj_ns_ops_tbl[type]->current_may_mount(); | |
1019 | spin_unlock(&kobj_ns_type_lock); | |
1020 | ||
1021 | return may_mount; | |
1022 | } | |
bc451f20 | 1023 | |
a685e089 | 1024 | void *kobj_ns_grab_current(enum kobj_ns_type type) |
bc451f20 | 1025 | { |
a685e089 | 1026 | void *ns = NULL; |
bc451f20 EB |
1027 | |
1028 | spin_lock(&kobj_ns_type_lock); | |
1029 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1030 | kobj_ns_ops_tbl[type]) | |
a685e089 | 1031 | ns = kobj_ns_ops_tbl[type]->grab_current_ns(); |
bc451f20 EB |
1032 | spin_unlock(&kobj_ns_type_lock); |
1033 | ||
1034 | return ns; | |
1035 | } | |
172856ea | 1036 | EXPORT_SYMBOL_GPL(kobj_ns_grab_current); |
bc451f20 EB |
1037 | |
1038 | const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk) | |
1039 | { | |
1040 | const void *ns = NULL; | |
1041 | ||
1042 | spin_lock(&kobj_ns_type_lock); | |
1043 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1044 | kobj_ns_ops_tbl[type]) | |
1045 | ns = kobj_ns_ops_tbl[type]->netlink_ns(sk); | |
1046 | spin_unlock(&kobj_ns_type_lock); | |
1047 | ||
1048 | return ns; | |
1049 | } | |
1050 | ||
1051 | const void *kobj_ns_initial(enum kobj_ns_type type) | |
1052 | { | |
1053 | const void *ns = NULL; | |
1054 | ||
1055 | spin_lock(&kobj_ns_type_lock); | |
1056 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1057 | kobj_ns_ops_tbl[type]) | |
1058 | ns = kobj_ns_ops_tbl[type]->initial_ns(); | |
1059 | spin_unlock(&kobj_ns_type_lock); | |
1060 | ||
1061 | return ns; | |
1062 | } | |
1063 | ||
a685e089 | 1064 | void kobj_ns_drop(enum kobj_ns_type type, void *ns) |
bc451f20 | 1065 | { |
a685e089 AV |
1066 | spin_lock(&kobj_ns_type_lock); |
1067 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1068 | kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns) | |
1069 | kobj_ns_ops_tbl[type]->drop_ns(ns); | |
1070 | spin_unlock(&kobj_ns_type_lock); | |
bc451f20 | 1071 | } |
172856ea | 1072 | EXPORT_SYMBOL_GPL(kobj_ns_drop); |