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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 | ||
5f81880d DT |
38 | /** |
39 | * kobject_get_ownership - get sysfs ownership data for @kobj | |
40 | * @kobj: kobject in question | |
41 | * @uid: kernel user ID for sysfs objects | |
42 | * @gid: kernel group ID for sysfs objects | |
43 | * | |
44 | * Returns initial uid/gid pair that should be used when creating sysfs | |
45 | * representation of given kobject. Normally used to adjust ownership of | |
46 | * objects in a container. | |
47 | */ | |
48 | void 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 | ||
e374a2bf GKH |
57 | /* |
58 | * populate_dir - populate directory with attributes. | |
59 | * @kobj: object we're working on. | |
1da177e4 | 60 | * |
e374a2bf GKH |
61 | * Most subsystems have a set of default attributes that are associated |
62 | * with an object that registers with them. This is a helper called during | |
63 | * object registration that loops through the default attributes of the | |
64 | * subsystem and creates attributes files for them in sysfs. | |
1da177e4 | 65 | */ |
e374a2bf | 66 | static int populate_dir(struct kobject *kobj) |
1da177e4 | 67 | { |
e374a2bf GKH |
68 | struct kobj_type *t = get_ktype(kobj); |
69 | struct attribute *attr; | |
1da177e4 LT |
70 | int error = 0; |
71 | int i; | |
e374a2bf | 72 | |
1da177e4 LT |
73 | if (t && t->default_attrs) { |
74 | for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) { | |
e374a2bf GKH |
75 | error = sysfs_create_file(kobj, attr); |
76 | if (error) | |
1da177e4 LT |
77 | break; |
78 | } | |
79 | } | |
80 | return error; | |
81 | } | |
82 | ||
e374a2bf | 83 | static int create_dir(struct kobject *kobj) |
1da177e4 | 84 | { |
aa30f47c | 85 | const struct kobj_type *ktype = get_ktype(kobj); |
c84a3b27 | 86 | const struct kobj_ns_type_operations *ops; |
e34ff490 TH |
87 | int error; |
88 | ||
89 | error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj)); | |
c84a3b27 TH |
90 | if (error) |
91 | return error; | |
92 | ||
93 | error = populate_dir(kobj); | |
94 | if (error) { | |
95 | sysfs_remove_dir(kobj); | |
96 | return error; | |
1da177e4 | 97 | } |
26ea12de | 98 | |
aa30f47c KB |
99 | if (ktype) { |
100 | error = sysfs_create_groups(kobj, ktype->default_groups); | |
101 | if (error) { | |
102 | sysfs_remove_dir(kobj); | |
103 | return error; | |
104 | } | |
105 | } | |
106 | ||
26ea12de TH |
107 | /* |
108 | * @kobj->sd may be deleted by an ancestor going away. Hold an | |
109 | * extra reference so that it stays until @kobj is gone. | |
110 | */ | |
111 | sysfs_get(kobj->sd); | |
112 | ||
c84a3b27 TH |
113 | /* |
114 | * If @kobj has ns_ops, its children need to be filtered based on | |
115 | * their namespace tags. Enable namespace support on @kobj->sd. | |
116 | */ | |
117 | ops = kobj_child_ns_ops(kobj); | |
118 | if (ops) { | |
119 | BUG_ON(ops->type <= KOBJ_NS_TYPE_NONE); | |
120 | BUG_ON(ops->type >= KOBJ_NS_TYPES); | |
121 | BUG_ON(!kobj_ns_type_registered(ops->type)); | |
122 | ||
fa4cd451 | 123 | sysfs_enable_ns(kobj->sd); |
c84a3b27 TH |
124 | } |
125 | ||
126 | return 0; | |
1da177e4 LT |
127 | } |
128 | ||
1da177e4 LT |
129 | static int get_kobj_path_length(struct kobject *kobj) |
130 | { | |
131 | int length = 1; | |
e374a2bf | 132 | struct kobject *parent = kobj; |
1da177e4 | 133 | |
e374a2bf | 134 | /* walk up the ancestors until we hit the one pointing to the |
1da177e4 LT |
135 | * root. |
136 | * Add 1 to strlen for leading '/' of each level. | |
137 | */ | |
138 | do { | |
b365b3da CE |
139 | if (kobject_name(parent) == NULL) |
140 | return 0; | |
1da177e4 LT |
141 | length += strlen(kobject_name(parent)) + 1; |
142 | parent = parent->parent; | |
143 | } while (parent); | |
144 | return length; | |
145 | } | |
146 | ||
147 | static void fill_kobj_path(struct kobject *kobj, char *path, int length) | |
148 | { | |
e374a2bf | 149 | struct kobject *parent; |
1da177e4 LT |
150 | |
151 | --length; | |
152 | for (parent = kobj; parent; parent = parent->parent) { | |
153 | int cur = strlen(kobject_name(parent)); | |
154 | /* back up enough to print this name with '/' */ | |
155 | length -= cur; | |
77d2a24b | 156 | memcpy(path + length, kobject_name(parent), cur); |
1da177e4 LT |
157 | *(path + --length) = '/'; |
158 | } | |
159 | ||
9f66fa2a | 160 | pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj), |
810304db | 161 | kobj, __func__, path); |
1da177e4 LT |
162 | } |
163 | ||
164 | /** | |
72fd4a35 | 165 | * kobject_get_path - generate and return the path associated with a given kobj and kset pair. |
1da177e4 LT |
166 | * |
167 | * @kobj: kobject in question, with which to build the path | |
168 | * @gfp_mask: the allocation type used to allocate the path | |
72fd4a35 RD |
169 | * |
170 | * The result must be freed by the caller with kfree(). | |
1da177e4 | 171 | */ |
fd4f2df2 | 172 | char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask) |
1da177e4 LT |
173 | { |
174 | char *path; | |
175 | int len; | |
176 | ||
177 | len = get_kobj_path_length(kobj); | |
b365b3da CE |
178 | if (len == 0) |
179 | return NULL; | |
4668edc3 | 180 | path = kzalloc(len, gfp_mask); |
1da177e4 LT |
181 | if (!path) |
182 | return NULL; | |
1da177e4 LT |
183 | fill_kobj_path(kobj, path, len); |
184 | ||
185 | return path; | |
186 | } | |
80fc9f53 | 187 | EXPORT_SYMBOL_GPL(kobject_get_path); |
1da177e4 | 188 | |
0f4dafc0 KS |
189 | /* add the kobject to its kset's list */ |
190 | static void kobj_kset_join(struct kobject *kobj) | |
1da177e4 | 191 | { |
0f4dafc0 | 192 | if (!kobj->kset) |
31b9025a | 193 | return; |
0f4dafc0 KS |
194 | |
195 | kset_get(kobj->kset); | |
196 | spin_lock(&kobj->kset->list_lock); | |
197 | list_add_tail(&kobj->entry, &kobj->kset->list); | |
198 | spin_unlock(&kobj->kset->list_lock); | |
1da177e4 LT |
199 | } |
200 | ||
0f4dafc0 KS |
201 | /* remove the kobject from its kset's list */ |
202 | static void kobj_kset_leave(struct kobject *kobj) | |
203 | { | |
204 | if (!kobj->kset) | |
205 | return; | |
1da177e4 | 206 | |
0f4dafc0 KS |
207 | spin_lock(&kobj->kset->list_lock); |
208 | list_del_init(&kobj->entry); | |
209 | spin_unlock(&kobj->kset->list_lock); | |
210 | kset_put(kobj->kset); | |
211 | } | |
1da177e4 | 212 | |
e374a2bf | 213 | static void kobject_init_internal(struct kobject *kobj) |
1da177e4 | 214 | { |
0f4dafc0 KS |
215 | if (!kobj) |
216 | return; | |
217 | kref_init(&kobj->kref); | |
218 | INIT_LIST_HEAD(&kobj->entry); | |
a4573c48 GKH |
219 | kobj->state_in_sysfs = 0; |
220 | kobj->state_add_uevent_sent = 0; | |
221 | kobj->state_remove_uevent_sent = 0; | |
222 | kobj->state_initialized = 1; | |
1da177e4 LT |
223 | } |
224 | ||
0f4dafc0 | 225 | |
9e7bbccd | 226 | static int kobject_add_internal(struct kobject *kobj) |
1da177e4 LT |
227 | { |
228 | int error = 0; | |
e374a2bf | 229 | struct kobject *parent; |
1da177e4 | 230 | |
0f4dafc0 | 231 | if (!kobj) |
1da177e4 | 232 | return -ENOENT; |
0f4dafc0 | 233 | |
af5ca3f4 | 234 | if (!kobj->name || !kobj->name[0]) { |
82d1f117 AS |
235 | WARN(1, |
236 | "kobject: (%p): attempted to be registered with empty name!\n", | |
237 | kobj); | |
c171fef5 GKH |
238 | return -EINVAL; |
239 | } | |
1da177e4 | 240 | |
0f4dafc0 | 241 | parent = kobject_get(kobj->parent); |
1da177e4 | 242 | |
0f4dafc0 | 243 | /* join kset if set, use it as parent if we do not already have one */ |
1da177e4 | 244 | if (kobj->kset) { |
0f4dafc0 | 245 | if (!parent) |
1da177e4 | 246 | parent = kobject_get(&kobj->kset->kobj); |
0f4dafc0 | 247 | kobj_kset_join(kobj); |
460f7e9a | 248 | kobj->parent = parent; |
1da177e4 | 249 | } |
1da177e4 | 250 | |
0f4dafc0 | 251 | pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n", |
810304db | 252 | kobject_name(kobj), kobj, __func__, |
0f4dafc0 | 253 | parent ? kobject_name(parent) : "<NULL>", |
e374a2bf | 254 | kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>"); |
0f4dafc0 | 255 | |
90bc6135 | 256 | error = create_dir(kobj); |
1da177e4 | 257 | if (error) { |
0f4dafc0 KS |
258 | kobj_kset_leave(kobj); |
259 | kobject_put(parent); | |
260 | kobj->parent = NULL; | |
dcd0da00 GKH |
261 | |
262 | /* be noisy on error issues */ | |
263 | if (error == -EEXIST) | |
3e14c6ab DV |
264 | pr_err("%s failed for %s with -EEXIST, don't try to register things with the same name in the same directory.\n", |
265 | __func__, kobject_name(kobj)); | |
dcd0da00 | 266 | else |
3e14c6ab DV |
267 | pr_err("%s failed for %s (error: %d parent: %s)\n", |
268 | __func__, kobject_name(kobj), error, | |
269 | parent ? kobject_name(parent) : "'none'"); | |
0f4dafc0 KS |
270 | } else |
271 | kobj->state_in_sysfs = 1; | |
1da177e4 LT |
272 | |
273 | return error; | |
274 | } | |
275 | ||
663a4743 GKH |
276 | /** |
277 | * kobject_set_name_vargs - Set the name of an kobject | |
278 | * @kobj: struct kobject to set the name of | |
279 | * @fmt: format string used to build the name | |
280 | * @vargs: vargs to format the string. | |
281 | */ | |
1fa5ae85 | 282 | int kobject_set_name_vargs(struct kobject *kobj, const char *fmt, |
663a4743 GKH |
283 | va_list vargs) |
284 | { | |
f773f32d | 285 | const char *s; |
663a4743 | 286 | |
8a577ffc KS |
287 | if (kobj->name && !fmt) |
288 | return 0; | |
289 | ||
f773f32d | 290 | s = kvasprintf_const(GFP_KERNEL, fmt, vargs); |
2abf114f | 291 | if (!s) |
a4ca6617 | 292 | return -ENOMEM; |
663a4743 | 293 | |
f773f32d RV |
294 | /* |
295 | * ewww... some of these buggers have '/' in the name ... If | |
296 | * that's the case, we need to make sure we have an actual | |
297 | * allocated copy to modify, since kvasprintf_const may have | |
298 | * returned something from .rodata. | |
299 | */ | |
300 | if (strchr(s, '/')) { | |
301 | char *t; | |
302 | ||
303 | t = kstrdup(s, GFP_KERNEL); | |
304 | kfree_const(s); | |
305 | if (!t) | |
306 | return -ENOMEM; | |
307 | strreplace(t, '/', '!'); | |
308 | s = t; | |
309 | } | |
310 | kfree_const(kobj->name); | |
2abf114f | 311 | kobj->name = s; |
9f255651 | 312 | |
663a4743 GKH |
313 | return 0; |
314 | } | |
1da177e4 LT |
315 | |
316 | /** | |
8c4606b1 | 317 | * kobject_set_name - Set the name of a kobject |
663a4743 | 318 | * @kobj: struct kobject to set the name of |
8c4606b1 | 319 | * @fmt: format string used to build the name |
1da177e4 | 320 | * |
8c4606b1 GKH |
321 | * This sets the name of the kobject. If you have already added the |
322 | * kobject to the system, you must call kobject_rename() in order to | |
323 | * change the name of the kobject. | |
1da177e4 | 324 | */ |
663a4743 | 325 | int kobject_set_name(struct kobject *kobj, const char *fmt, ...) |
1da177e4 | 326 | { |
a4ca6617 | 327 | va_list vargs; |
663a4743 | 328 | int retval; |
1da177e4 | 329 | |
a4ca6617 KS |
330 | va_start(vargs, fmt); |
331 | retval = kobject_set_name_vargs(kobj, fmt, vargs); | |
332 | va_end(vargs); | |
1da177e4 | 333 | |
663a4743 | 334 | return retval; |
1da177e4 | 335 | } |
1da177e4 LT |
336 | EXPORT_SYMBOL(kobject_set_name); |
337 | ||
e86000d0 | 338 | /** |
f9cb074b | 339 | * kobject_init - initialize a kobject structure |
e86000d0 GKH |
340 | * @kobj: pointer to the kobject to initialize |
341 | * @ktype: pointer to the ktype for this kobject. | |
342 | * | |
343 | * This function will properly initialize a kobject such that it can then | |
344 | * be passed to the kobject_add() call. | |
345 | * | |
346 | * After this function is called, the kobject MUST be cleaned up by a call | |
347 | * to kobject_put(), not by a call to kfree directly to ensure that all of | |
348 | * the memory is cleaned up properly. | |
349 | */ | |
f9cb074b | 350 | void kobject_init(struct kobject *kobj, struct kobj_type *ktype) |
e86000d0 GKH |
351 | { |
352 | char *err_str; | |
353 | ||
354 | if (!kobj) { | |
355 | err_str = "invalid kobject pointer!"; | |
356 | goto error; | |
357 | } | |
358 | if (!ktype) { | |
359 | err_str = "must have a ktype to be initialized properly!\n"; | |
360 | goto error; | |
361 | } | |
0f4dafc0 | 362 | if (kobj->state_initialized) { |
e86000d0 | 363 | /* do not error out as sometimes we can recover */ |
82d1f117 AS |
364 | pr_err("kobject (%p): tried to init an initialized object, something is seriously wrong.\n", |
365 | kobj); | |
e86000d0 GKH |
366 | dump_stack(); |
367 | } | |
368 | ||
a4573c48 | 369 | kobject_init_internal(kobj); |
e86000d0 GKH |
370 | kobj->ktype = ktype; |
371 | return; | |
372 | ||
373 | error: | |
82d1f117 | 374 | pr_err("kobject (%p): %s\n", kobj, err_str); |
e86000d0 GKH |
375 | dump_stack(); |
376 | } | |
f9cb074b | 377 | EXPORT_SYMBOL(kobject_init); |
e86000d0 | 378 | |
8db14860 NI |
379 | static __printf(3, 0) int kobject_add_varg(struct kobject *kobj, |
380 | struct kobject *parent, | |
381 | const char *fmt, va_list vargs) | |
244f6cee | 382 | { |
244f6cee GKH |
383 | int retval; |
384 | ||
a4ca6617 | 385 | retval = kobject_set_name_vargs(kobj, fmt, vargs); |
244f6cee | 386 | if (retval) { |
82d1f117 | 387 | pr_err("kobject: can not set name properly!\n"); |
244f6cee GKH |
388 | return retval; |
389 | } | |
390 | kobj->parent = parent; | |
9e7bbccd | 391 | return kobject_add_internal(kobj); |
244f6cee GKH |
392 | } |
393 | ||
394 | /** | |
b2d6db58 | 395 | * kobject_add - the main kobject add function |
244f6cee GKH |
396 | * @kobj: the kobject to add |
397 | * @parent: pointer to the parent of the kobject. | |
398 | * @fmt: format to name the kobject with. | |
399 | * | |
400 | * The kobject name is set and added to the kobject hierarchy in this | |
401 | * function. | |
402 | * | |
403 | * If @parent is set, then the parent of the @kobj will be set to it. | |
404 | * If @parent is NULL, then the parent of the @kobj will be set to the | |
9705710e | 405 | * kobject associated with the kset assigned to this kobject. If no kset |
244f6cee GKH |
406 | * is assigned to the kobject, then the kobject will be located in the |
407 | * root of the sysfs tree. | |
408 | * | |
409 | * If this function returns an error, kobject_put() must be called to | |
410 | * properly clean up the memory associated with the object. | |
244f6cee GKH |
411 | * Under no instance should the kobject that is passed to this function |
412 | * be directly freed with a call to kfree(), that can leak memory. | |
413 | * | |
0f4dafc0 | 414 | * Note, no "add" uevent will be created with this call, the caller should set |
244f6cee GKH |
415 | * up all of the necessary sysfs files for the object and then call |
416 | * kobject_uevent() with the UEVENT_ADD parameter to ensure that | |
417 | * userspace is properly notified of this kobject's creation. | |
418 | */ | |
b2d6db58 GKH |
419 | int kobject_add(struct kobject *kobj, struct kobject *parent, |
420 | const char *fmt, ...) | |
244f6cee GKH |
421 | { |
422 | va_list args; | |
423 | int retval; | |
424 | ||
425 | if (!kobj) | |
426 | return -EINVAL; | |
427 | ||
0f4dafc0 | 428 | if (!kobj->state_initialized) { |
82d1f117 | 429 | pr_err("kobject '%s' (%p): tried to add an uninitialized object, something is seriously wrong.\n", |
0f4dafc0 KS |
430 | kobject_name(kobj), kobj); |
431 | dump_stack(); | |
432 | return -EINVAL; | |
433 | } | |
244f6cee GKH |
434 | va_start(args, fmt); |
435 | retval = kobject_add_varg(kobj, parent, fmt, args); | |
436 | va_end(args); | |
437 | ||
438 | return retval; | |
439 | } | |
b2d6db58 | 440 | EXPORT_SYMBOL(kobject_add); |
244f6cee | 441 | |
c11c4154 GKH |
442 | /** |
443 | * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy | |
444 | * @kobj: pointer to the kobject to initialize | |
445 | * @ktype: pointer to the ktype for this kobject. | |
446 | * @parent: pointer to the parent of this kobject. | |
447 | * @fmt: the name of the kobject. | |
448 | * | |
f9cb074b | 449 | * This function combines the call to kobject_init() and |
b2d6db58 GKH |
450 | * kobject_add(). The same type of error handling after a call to |
451 | * kobject_add() and kobject lifetime rules are the same here. | |
c11c4154 GKH |
452 | */ |
453 | int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype, | |
454 | struct kobject *parent, const char *fmt, ...) | |
455 | { | |
456 | va_list args; | |
457 | int retval; | |
458 | ||
f9cb074b | 459 | kobject_init(kobj, ktype); |
c11c4154 GKH |
460 | |
461 | va_start(args, fmt); | |
462 | retval = kobject_add_varg(kobj, parent, fmt, args); | |
463 | va_end(args); | |
464 | ||
465 | return retval; | |
466 | } | |
467 | EXPORT_SYMBOL_GPL(kobject_init_and_add); | |
468 | ||
1da177e4 | 469 | /** |
e374a2bf GKH |
470 | * kobject_rename - change the name of an object |
471 | * @kobj: object in question. | |
472 | * @new_name: object's new name | |
030c1d2b EB |
473 | * |
474 | * It is the responsibility of the caller to provide mutual | |
475 | * exclusion between two different calls of kobject_rename | |
476 | * on the same kobject and to ensure that new_name is valid and | |
477 | * won't conflict with other kobjects. | |
1da177e4 | 478 | */ |
e374a2bf | 479 | int kobject_rename(struct kobject *kobj, const char *new_name) |
1da177e4 LT |
480 | { |
481 | int error = 0; | |
ca2f37db | 482 | const char *devpath = NULL; |
0b4a4fea | 483 | const char *dup_name = NULL, *name; |
ca2f37db JT |
484 | char *devpath_string = NULL; |
485 | char *envp[2]; | |
1da177e4 LT |
486 | |
487 | kobj = kobject_get(kobj); | |
488 | if (!kobj) | |
489 | return -EINVAL; | |
b592fcfe EB |
490 | if (!kobj->parent) |
491 | return -EINVAL; | |
ca2f37db JT |
492 | |
493 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
494 | if (!devpath) { | |
495 | error = -ENOMEM; | |
496 | goto out; | |
497 | } | |
498 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
499 | if (!devpath_string) { | |
500 | error = -ENOMEM; | |
501 | goto out; | |
502 | } | |
503 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
504 | envp[0] = devpath_string; | |
505 | envp[1] = NULL; | |
ca2f37db | 506 | |
f773f32d | 507 | name = dup_name = kstrdup_const(new_name, GFP_KERNEL); |
0b4a4fea EB |
508 | if (!name) { |
509 | error = -ENOMEM; | |
510 | goto out; | |
511 | } | |
512 | ||
e34ff490 | 513 | error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj)); |
0b4a4fea EB |
514 | if (error) |
515 | goto out; | |
516 | ||
517 | /* Install the new kobject name */ | |
518 | dup_name = kobj->name; | |
519 | kobj->name = name; | |
ca2f37db JT |
520 | |
521 | /* This function is mostly/only used for network interface. | |
522 | * Some hotplug package track interfaces by their name and | |
523 | * therefore want to know when the name is changed by the user. */ | |
0b4a4fea | 524 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); |
ca2f37db JT |
525 | |
526 | out: | |
f773f32d | 527 | kfree_const(dup_name); |
ca2f37db JT |
528 | kfree(devpath_string); |
529 | kfree(devpath); | |
b592fcfe EB |
530 | kobject_put(kobj); |
531 | ||
532 | return error; | |
533 | } | |
8344b568 | 534 | EXPORT_SYMBOL_GPL(kobject_rename); |
b592fcfe | 535 | |
8a82472f | 536 | /** |
e374a2bf GKH |
537 | * kobject_move - move object to another parent |
538 | * @kobj: object in question. | |
539 | * @new_parent: object's new parent (can be NULL) | |
8a82472f | 540 | */ |
8a82472f CH |
541 | int kobject_move(struct kobject *kobj, struct kobject *new_parent) |
542 | { | |
543 | int error; | |
544 | struct kobject *old_parent; | |
545 | const char *devpath = NULL; | |
546 | char *devpath_string = NULL; | |
547 | char *envp[2]; | |
548 | ||
549 | kobj = kobject_get(kobj); | |
550 | if (!kobj) | |
551 | return -EINVAL; | |
552 | new_parent = kobject_get(new_parent); | |
553 | if (!new_parent) { | |
c744aeae CH |
554 | if (kobj->kset) |
555 | new_parent = kobject_get(&kobj->kset->kobj); | |
8a82472f | 556 | } |
e34ff490 | 557 | |
8a82472f CH |
558 | /* old object path */ |
559 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
560 | if (!devpath) { | |
561 | error = -ENOMEM; | |
562 | goto out; | |
563 | } | |
564 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
565 | if (!devpath_string) { | |
566 | error = -ENOMEM; | |
567 | goto out; | |
568 | } | |
569 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
570 | envp[0] = devpath_string; | |
571 | envp[1] = NULL; | |
e34ff490 | 572 | error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj)); |
8a82472f CH |
573 | if (error) |
574 | goto out; | |
575 | old_parent = kobj->parent; | |
576 | kobj->parent = new_parent; | |
9e993efb | 577 | new_parent = NULL; |
8a82472f CH |
578 | kobject_put(old_parent); |
579 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); | |
580 | out: | |
9e993efb | 581 | kobject_put(new_parent); |
8a82472f CH |
582 | kobject_put(kobj); |
583 | kfree(devpath_string); | |
584 | kfree(devpath); | |
585 | return error; | |
586 | } | |
24199d20 | 587 | EXPORT_SYMBOL_GPL(kobject_move); |
8a82472f | 588 | |
1da177e4 | 589 | /** |
e374a2bf GKH |
590 | * kobject_del - unlink kobject from hierarchy. |
591 | * @kobj: object. | |
1da177e4 | 592 | */ |
e374a2bf | 593 | void kobject_del(struct kobject *kobj) |
1da177e4 | 594 | { |
324a56e1 | 595 | struct kernfs_node *sd; |
aa30f47c | 596 | const struct kobj_type *ktype = get_ktype(kobj); |
26ea12de | 597 | |
31b9025a GKH |
598 | if (!kobj) |
599 | return; | |
0f4dafc0 | 600 | |
26ea12de | 601 | sd = kobj->sd; |
aa30f47c KB |
602 | |
603 | if (ktype) | |
604 | sysfs_remove_groups(kobj, ktype->default_groups); | |
605 | ||
1da177e4 | 606 | sysfs_remove_dir(kobj); |
26ea12de TH |
607 | sysfs_put(sd); |
608 | ||
0f4dafc0 KS |
609 | kobj->state_in_sysfs = 0; |
610 | kobj_kset_leave(kobj); | |
611 | kobject_put(kobj->parent); | |
612 | kobj->parent = NULL; | |
1da177e4 | 613 | } |
fa40ae34 | 614 | EXPORT_SYMBOL(kobject_del); |
1da177e4 | 615 | |
1da177e4 | 616 | /** |
e374a2bf GKH |
617 | * kobject_get - increment refcount for object. |
618 | * @kobj: object. | |
1da177e4 | 619 | */ |
e374a2bf | 620 | struct kobject *kobject_get(struct kobject *kobj) |
1da177e4 | 621 | { |
d82d54af EZ |
622 | if (kobj) { |
623 | if (!kobj->state_initialized) | |
82d1f117 AS |
624 | WARN(1, KERN_WARNING |
625 | "kobject: '%s' (%p): is not initialized, yet kobject_get() is being called.\n", | |
626 | kobject_name(kobj), kobj); | |
1da177e4 | 627 | kref_get(&kobj->kref); |
d82d54af | 628 | } |
1da177e4 LT |
629 | return kobj; |
630 | } | |
fa40ae34 | 631 | EXPORT_SYMBOL(kobject_get); |
1da177e4 | 632 | |
c70c176f | 633 | struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj) |
a49b7e82 | 634 | { |
c70c176f JK |
635 | if (!kobj) |
636 | return NULL; | |
a49b7e82 LT |
637 | if (!kref_get_unless_zero(&kobj->kref)) |
638 | kobj = NULL; | |
639 | return kobj; | |
640 | } | |
c70c176f | 641 | EXPORT_SYMBOL(kobject_get_unless_zero); |
a49b7e82 | 642 | |
18041f47 GKH |
643 | /* |
644 | * kobject_cleanup - free kobject resources. | |
645 | * @kobj: object to cleanup | |
1da177e4 | 646 | */ |
18041f47 | 647 | static void kobject_cleanup(struct kobject *kobj) |
1da177e4 | 648 | { |
0f4dafc0 | 649 | struct kobj_type *t = get_ktype(kobj); |
af5ca3f4 | 650 | const char *name = kobj->name; |
1da177e4 | 651 | |
c817a67e RK |
652 | pr_debug("kobject: '%s' (%p): %s, parent %p\n", |
653 | kobject_name(kobj), kobj, __func__, kobj->parent); | |
0f4dafc0 KS |
654 | |
655 | if (t && !t->release) | |
186bddb2 | 656 | pr_debug("kobject: '%s' (%p): does not have a release() function, it is broken and must be fixed. See Documentation/kobject.txt.\n", |
0f4dafc0 KS |
657 | kobject_name(kobj), kobj); |
658 | ||
659 | /* send "remove" if the caller did not do it but sent "add" */ | |
660 | if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) { | |
661 | pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n", | |
662 | kobject_name(kobj), kobj); | |
663 | kobject_uevent(kobj, KOBJ_REMOVE); | |
664 | } | |
665 | ||
666 | /* remove from sysfs if the caller did not do it */ | |
667 | if (kobj->state_in_sysfs) { | |
668 | pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n", | |
669 | kobject_name(kobj), kobj); | |
670 | kobject_del(kobj); | |
671 | } | |
672 | ||
ce2c9cb0 | 673 | if (t && t->release) { |
0f4dafc0 KS |
674 | pr_debug("kobject: '%s' (%p): calling ktype release\n", |
675 | kobject_name(kobj), kobj); | |
1da177e4 | 676 | t->release(kobj); |
0f4dafc0 KS |
677 | } |
678 | ||
679 | /* free name if we allocated it */ | |
af5ca3f4 | 680 | if (name) { |
0f4dafc0 | 681 | pr_debug("kobject: '%s': free name\n", name); |
f773f32d | 682 | kfree_const(name); |
ce2c9cb0 | 683 | } |
1da177e4 LT |
684 | } |
685 | ||
c817a67e RK |
686 | #ifdef CONFIG_DEBUG_KOBJECT_RELEASE |
687 | static void kobject_delayed_cleanup(struct work_struct *work) | |
688 | { | |
689 | kobject_cleanup(container_of(to_delayed_work(work), | |
690 | struct kobject, release)); | |
691 | } | |
692 | #endif | |
693 | ||
1da177e4 LT |
694 | static void kobject_release(struct kref *kref) |
695 | { | |
c817a67e RK |
696 | struct kobject *kobj = container_of(kref, struct kobject, kref); |
697 | #ifdef CONFIG_DEBUG_KOBJECT_RELEASE | |
89c86a64 BH |
698 | unsigned long delay = HZ + HZ * (get_random_int() & 0x3); |
699 | pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n", | |
700 | kobject_name(kobj), kobj, __func__, kobj->parent, delay); | |
c817a67e | 701 | INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup); |
89c86a64 BH |
702 | |
703 | schedule_delayed_work(&kobj->release, delay); | |
c817a67e RK |
704 | #else |
705 | kobject_cleanup(kobj); | |
706 | #endif | |
1da177e4 LT |
707 | } |
708 | ||
709 | /** | |
e374a2bf GKH |
710 | * kobject_put - decrement refcount for object. |
711 | * @kobj: object. | |
1da177e4 | 712 | * |
e374a2bf | 713 | * Decrement the refcount, and if 0, call kobject_cleanup(). |
1da177e4 | 714 | */ |
e374a2bf | 715 | void kobject_put(struct kobject *kobj) |
1da177e4 | 716 | { |
c1ebdae5 | 717 | if (kobj) { |
d955c78a | 718 | if (!kobj->state_initialized) |
82d1f117 AS |
719 | WARN(1, KERN_WARNING |
720 | "kobject: '%s' (%p): is not initialized, yet kobject_put() is being called.\n", | |
721 | kobject_name(kobj), kobj); | |
1da177e4 | 722 | kref_put(&kobj->kref, kobject_release); |
c1ebdae5 | 723 | } |
1da177e4 | 724 | } |
fa40ae34 | 725 | EXPORT_SYMBOL(kobject_put); |
1da177e4 | 726 | |
3f9e3ee9 | 727 | static void dynamic_kobj_release(struct kobject *kobj) |
7423172a | 728 | { |
810304db | 729 | pr_debug("kobject: (%p): %s\n", kobj, __func__); |
7423172a JN |
730 | kfree(kobj); |
731 | } | |
732 | ||
3f9e3ee9 | 733 | static struct kobj_type dynamic_kobj_ktype = { |
386f275f KS |
734 | .release = dynamic_kobj_release, |
735 | .sysfs_ops = &kobj_sysfs_ops, | |
7423172a JN |
736 | }; |
737 | ||
43968d2f | 738 | /** |
3f9e3ee9 GKH |
739 | * kobject_create - create a struct kobject dynamically |
740 | * | |
741 | * This function creates a kobject structure dynamically and sets it up | |
742 | * to be a "dynamic" kobject with a default release function set up. | |
743 | * | |
744 | * If the kobject was not able to be created, NULL will be returned. | |
43968d2f | 745 | * The kobject structure returned from here must be cleaned up with a |
f9cb074b | 746 | * call to kobject_put() and not kfree(), as kobject_init() has |
43968d2f | 747 | * already been called on this structure. |
3f9e3ee9 | 748 | */ |
43968d2f | 749 | struct kobject *kobject_create(void) |
3f9e3ee9 GKH |
750 | { |
751 | struct kobject *kobj; | |
752 | ||
753 | kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); | |
754 | if (!kobj) | |
755 | return NULL; | |
756 | ||
f9cb074b | 757 | kobject_init(kobj, &dynamic_kobj_ktype); |
3f9e3ee9 GKH |
758 | return kobj; |
759 | } | |
760 | ||
761 | /** | |
762 | * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs | |
763 | * | |
9ff1f838 | 764 | * @name: the name for the kobject |
3f9e3ee9 GKH |
765 | * @parent: the parent kobject of this kobject, if any. |
766 | * | |
f70701a3 | 767 | * This function creates a kobject structure dynamically and registers it |
3f9e3ee9 | 768 | * with sysfs. When you are finished with this structure, call |
78a2d906 | 769 | * kobject_put() and the structure will be dynamically freed when |
3f9e3ee9 GKH |
770 | * it is no longer being used. |
771 | * | |
772 | * If the kobject was not able to be created, NULL will be returned. | |
773 | */ | |
774 | struct kobject *kobject_create_and_add(const char *name, struct kobject *parent) | |
775 | { | |
776 | struct kobject *kobj; | |
777 | int retval; | |
778 | ||
779 | kobj = kobject_create(); | |
780 | if (!kobj) | |
781 | return NULL; | |
782 | ||
b2d6db58 | 783 | retval = kobject_add(kobj, parent, "%s", name); |
3f9e3ee9 | 784 | if (retval) { |
82d1f117 | 785 | pr_warn("%s: kobject_add error: %d\n", __func__, retval); |
3f9e3ee9 GKH |
786 | kobject_put(kobj); |
787 | kobj = NULL; | |
788 | } | |
789 | return kobj; | |
790 | } | |
791 | EXPORT_SYMBOL_GPL(kobject_create_and_add); | |
792 | ||
1da177e4 | 793 | /** |
e374a2bf GKH |
794 | * kset_init - initialize a kset for use |
795 | * @k: kset | |
1da177e4 | 796 | */ |
e374a2bf | 797 | void kset_init(struct kset *k) |
1da177e4 | 798 | { |
e1543ddf | 799 | kobject_init_internal(&k->kobj); |
1da177e4 LT |
800 | INIT_LIST_HEAD(&k->list); |
801 | spin_lock_init(&k->list_lock); | |
802 | } | |
803 | ||
23b5212c KS |
804 | /* default kobject attribute operations */ |
805 | static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr, | |
806 | char *buf) | |
807 | { | |
808 | struct kobj_attribute *kattr; | |
809 | ssize_t ret = -EIO; | |
810 | ||
811 | kattr = container_of(attr, struct kobj_attribute, attr); | |
812 | if (kattr->show) | |
813 | ret = kattr->show(kobj, kattr, buf); | |
814 | return ret; | |
815 | } | |
816 | ||
817 | static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr, | |
818 | const char *buf, size_t count) | |
819 | { | |
820 | struct kobj_attribute *kattr; | |
821 | ssize_t ret = -EIO; | |
822 | ||
823 | kattr = container_of(attr, struct kobj_attribute, attr); | |
824 | if (kattr->store) | |
825 | ret = kattr->store(kobj, kattr, buf, count); | |
826 | return ret; | |
827 | } | |
828 | ||
52cf25d0 | 829 | const struct sysfs_ops kobj_sysfs_ops = { |
23b5212c KS |
830 | .show = kobj_attr_show, |
831 | .store = kobj_attr_store, | |
832 | }; | |
29dfe2dc | 833 | EXPORT_SYMBOL_GPL(kobj_sysfs_ops); |
1da177e4 | 834 | |
1da177e4 | 835 | /** |
e374a2bf GKH |
836 | * kset_register - initialize and add a kset. |
837 | * @k: kset. | |
1da177e4 | 838 | */ |
e374a2bf | 839 | int kset_register(struct kset *k) |
1da177e4 | 840 | { |
80f03e34 KS |
841 | int err; |
842 | ||
31b9025a GKH |
843 | if (!k) |
844 | return -EINVAL; | |
80f03e34 | 845 | |
1da177e4 | 846 | kset_init(k); |
12e339ac | 847 | err = kobject_add_internal(&k->kobj); |
80f03e34 KS |
848 | if (err) |
849 | return err; | |
850 | kobject_uevent(&k->kobj, KOBJ_ADD); | |
851 | return 0; | |
1da177e4 | 852 | } |
fa40ae34 | 853 | EXPORT_SYMBOL(kset_register); |
1da177e4 | 854 | |
1da177e4 | 855 | /** |
e374a2bf GKH |
856 | * kset_unregister - remove a kset. |
857 | * @k: kset. | |
1da177e4 | 858 | */ |
e374a2bf | 859 | void kset_unregister(struct kset *k) |
1da177e4 | 860 | { |
31b9025a GKH |
861 | if (!k) |
862 | return; | |
35a5fe69 | 863 | kobject_del(&k->kobj); |
78a2d906 | 864 | kobject_put(&k->kobj); |
1da177e4 | 865 | } |
fa40ae34 | 866 | EXPORT_SYMBOL(kset_unregister); |
1da177e4 | 867 | |
1da177e4 | 868 | /** |
e374a2bf GKH |
869 | * kset_find_obj - search for object in kset. |
870 | * @kset: kset we're looking in. | |
871 | * @name: object's name. | |
1da177e4 | 872 | * |
e374a2bf GKH |
873 | * Lock kset via @kset->subsys, and iterate over @kset->list, |
874 | * looking for a matching kobject. If matching object is found | |
875 | * take a reference and return the object. | |
1da177e4 | 876 | */ |
e374a2bf | 877 | struct kobject *kset_find_obj(struct kset *kset, const char *name) |
1da177e4 | 878 | { |
c6a2a3dc | 879 | struct kobject *k; |
e374a2bf | 880 | struct kobject *ret = NULL; |
1da177e4 LT |
881 | |
882 | spin_lock(&kset->list_lock); | |
c25d1dfb | 883 | |
c6a2a3dc | 884 | list_for_each_entry(k, &kset->list, entry) { |
e374a2bf | 885 | if (kobject_name(k) && !strcmp(kobject_name(k), name)) { |
a49b7e82 | 886 | ret = kobject_get_unless_zero(k); |
1da177e4 LT |
887 | break; |
888 | } | |
889 | } | |
c25d1dfb | 890 | |
1da177e4 LT |
891 | spin_unlock(&kset->list_lock); |
892 | return ret; | |
893 | } | |
2fe829ac | 894 | EXPORT_SYMBOL_GPL(kset_find_obj); |
1da177e4 | 895 | |
b727c702 GKH |
896 | static void kset_release(struct kobject *kobj) |
897 | { | |
898 | struct kset *kset = container_of(kobj, struct kset, kobj); | |
9f66fa2a | 899 | pr_debug("kobject: '%s' (%p): %s\n", |
810304db | 900 | kobject_name(kobj), kobj, __func__); |
b727c702 GKH |
901 | kfree(kset); |
902 | } | |
903 | ||
7ab35a14 | 904 | static void kset_get_ownership(struct kobject *kobj, kuid_t *uid, kgid_t *gid) |
d028b6f7 DT |
905 | { |
906 | if (kobj->parent) | |
907 | kobject_get_ownership(kobj->parent, uid, gid); | |
908 | } | |
909 | ||
386f275f KS |
910 | static struct kobj_type kset_ktype = { |
911 | .sysfs_ops = &kobj_sysfs_ops, | |
d028b6f7 DT |
912 | .release = kset_release, |
913 | .get_ownership = kset_get_ownership, | |
b727c702 GKH |
914 | }; |
915 | ||
916 | /** | |
917 | * kset_create - create a struct kset dynamically | |
918 | * | |
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. | |
922 | * | |
923 | * This function creates a kset structure dynamically. This structure can | |
924 | * then be registered with the system and show up in sysfs with a call to | |
925 | * kset_register(). When you are finished with this structure, if | |
926 | * kset_register() has been called, call kset_unregister() and the | |
927 | * structure will be dynamically freed when it is no longer being used. | |
928 | * | |
929 | * If the kset was not able to be created, NULL will be returned. | |
930 | */ | |
931 | static struct kset *kset_create(const char *name, | |
9cd43611 | 932 | const struct kset_uevent_ops *uevent_ops, |
b727c702 GKH |
933 | struct kobject *parent_kobj) |
934 | { | |
935 | struct kset *kset; | |
d9cd8f37 | 936 | int retval; |
b727c702 GKH |
937 | |
938 | kset = kzalloc(sizeof(*kset), GFP_KERNEL); | |
939 | if (!kset) | |
940 | return NULL; | |
b7165ebb | 941 | retval = kobject_set_name(&kset->kobj, "%s", name); |
d9cd8f37 DY |
942 | if (retval) { |
943 | kfree(kset); | |
944 | return NULL; | |
945 | } | |
b727c702 GKH |
946 | kset->uevent_ops = uevent_ops; |
947 | kset->kobj.parent = parent_kobj; | |
948 | ||
949 | /* | |
386f275f | 950 | * The kobject of this kset will have a type of kset_ktype and belong to |
b727c702 GKH |
951 | * no kset itself. That way we can properly free it when it is |
952 | * finished being used. | |
953 | */ | |
386f275f | 954 | kset->kobj.ktype = &kset_ktype; |
b727c702 GKH |
955 | kset->kobj.kset = NULL; |
956 | ||
957 | return kset; | |
958 | } | |
959 | ||
960 | /** | |
961 | * kset_create_and_add - create a struct kset dynamically and add it to sysfs | |
962 | * | |
963 | * @name: the name for the kset | |
964 | * @uevent_ops: a struct kset_uevent_ops for the kset | |
965 | * @parent_kobj: the parent kobject of this kset, if any. | |
966 | * | |
967 | * This function creates a kset structure dynamically and registers it | |
968 | * with sysfs. When you are finished with this structure, call | |
969 | * kset_unregister() and the structure will be dynamically freed when it | |
970 | * is no longer being used. | |
971 | * | |
972 | * If the kset was not able to be created, NULL will be returned. | |
973 | */ | |
974 | struct kset *kset_create_and_add(const char *name, | |
9cd43611 | 975 | const struct kset_uevent_ops *uevent_ops, |
b727c702 GKH |
976 | struct kobject *parent_kobj) |
977 | { | |
978 | struct kset *kset; | |
979 | int error; | |
980 | ||
981 | kset = kset_create(name, uevent_ops, parent_kobj); | |
982 | if (!kset) | |
983 | return NULL; | |
984 | error = kset_register(kset); | |
985 | if (error) { | |
986 | kfree(kset); | |
987 | return NULL; | |
988 | } | |
989 | return kset; | |
990 | } | |
991 | EXPORT_SYMBOL_GPL(kset_create_and_add); | |
992 | ||
bc451f20 EB |
993 | |
994 | static DEFINE_SPINLOCK(kobj_ns_type_lock); | |
995 | static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES]; | |
996 | ||
997 | int kobj_ns_type_register(const struct kobj_ns_type_operations *ops) | |
998 | { | |
999 | enum kobj_ns_type type = ops->type; | |
1000 | int error; | |
1001 | ||
1002 | spin_lock(&kobj_ns_type_lock); | |
1003 | ||
1004 | error = -EINVAL; | |
1005 | if (type >= KOBJ_NS_TYPES) | |
1006 | goto out; | |
1007 | ||
1008 | error = -EINVAL; | |
1009 | if (type <= KOBJ_NS_TYPE_NONE) | |
1010 | goto out; | |
1011 | ||
1012 | error = -EBUSY; | |
1013 | if (kobj_ns_ops_tbl[type]) | |
1014 | goto out; | |
1015 | ||
1016 | error = 0; | |
1017 | kobj_ns_ops_tbl[type] = ops; | |
1018 | ||
1019 | out: | |
1020 | spin_unlock(&kobj_ns_type_lock); | |
1021 | return error; | |
1022 | } | |
1023 | ||
1024 | int kobj_ns_type_registered(enum kobj_ns_type type) | |
1025 | { | |
1026 | int registered = 0; | |
1027 | ||
1028 | spin_lock(&kobj_ns_type_lock); | |
1029 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES)) | |
1030 | registered = kobj_ns_ops_tbl[type] != NULL; | |
1031 | spin_unlock(&kobj_ns_type_lock); | |
1032 | ||
1033 | return registered; | |
1034 | } | |
1035 | ||
1036 | const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent) | |
1037 | { | |
1038 | const struct kobj_ns_type_operations *ops = NULL; | |
1039 | ||
41fb96a4 | 1040 | if (parent && parent->ktype && parent->ktype->child_ns_type) |
bc451f20 EB |
1041 | ops = parent->ktype->child_ns_type(parent); |
1042 | ||
1043 | return ops; | |
1044 | } | |
1045 | ||
1046 | const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj) | |
1047 | { | |
1048 | return kobj_child_ns_ops(kobj->parent); | |
1049 | } | |
1050 | ||
7dc5dbc8 EB |
1051 | bool kobj_ns_current_may_mount(enum kobj_ns_type type) |
1052 | { | |
730d7d33 | 1053 | bool may_mount = true; |
7dc5dbc8 EB |
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 | may_mount = kobj_ns_ops_tbl[type]->current_may_mount(); | |
1059 | spin_unlock(&kobj_ns_type_lock); | |
1060 | ||
1061 | return may_mount; | |
1062 | } | |
bc451f20 | 1063 | |
a685e089 | 1064 | void *kobj_ns_grab_current(enum kobj_ns_type type) |
bc451f20 | 1065 | { |
a685e089 | 1066 | void *ns = NULL; |
bc451f20 EB |
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]) | |
a685e089 | 1071 | ns = kobj_ns_ops_tbl[type]->grab_current_ns(); |
bc451f20 EB |
1072 | spin_unlock(&kobj_ns_type_lock); |
1073 | ||
1074 | return ns; | |
1075 | } | |
172856ea | 1076 | EXPORT_SYMBOL_GPL(kobj_ns_grab_current); |
bc451f20 EB |
1077 | |
1078 | const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk) | |
1079 | { | |
1080 | const void *ns = NULL; | |
1081 | ||
1082 | spin_lock(&kobj_ns_type_lock); | |
1083 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1084 | kobj_ns_ops_tbl[type]) | |
1085 | ns = kobj_ns_ops_tbl[type]->netlink_ns(sk); | |
1086 | spin_unlock(&kobj_ns_type_lock); | |
1087 | ||
1088 | return ns; | |
1089 | } | |
1090 | ||
1091 | const void *kobj_ns_initial(enum kobj_ns_type type) | |
1092 | { | |
1093 | const void *ns = NULL; | |
1094 | ||
1095 | spin_lock(&kobj_ns_type_lock); | |
1096 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1097 | kobj_ns_ops_tbl[type]) | |
1098 | ns = kobj_ns_ops_tbl[type]->initial_ns(); | |
1099 | spin_unlock(&kobj_ns_type_lock); | |
1100 | ||
1101 | return ns; | |
1102 | } | |
1103 | ||
a685e089 | 1104 | void kobj_ns_drop(enum kobj_ns_type type, void *ns) |
bc451f20 | 1105 | { |
a685e089 AV |
1106 | spin_lock(&kobj_ns_type_lock); |
1107 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1108 | kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns) | |
1109 | kobj_ns_ops_tbl[type]->drop_ns(ns); | |
1110 | spin_unlock(&kobj_ns_type_lock); | |
bc451f20 | 1111 | } |
172856ea | 1112 | EXPORT_SYMBOL_GPL(kobj_ns_drop); |