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 | * |
0c1bc6b8 | 9 | * Please see the file Documentation/core-api/kobject.rst for critical information |
1da177e4 LT |
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 | 20 | /** |
ed856349 | 21 | * kobject_namespace() - Return @kobj's namespace tag. |
e34ff490 TH |
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 | */ | |
542aa246 | 28 | const void *kobject_namespace(const struct kobject *kobj) |
e34ff490 TH |
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 | 38 | /** |
ed856349 | 39 | * kobject_get_ownership() - Get sysfs ownership data for @kobj. |
5f81880d DT |
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 | */ | |
02a476d9 | 48 | void kobject_get_ownership(const struct kobject *kobj, kuid_t *uid, kgid_t *gid) |
5f81880d DT |
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 | 57 | static int create_dir(struct kobject *kobj) |
1da177e4 | 58 | { |
aa30f47c | 59 | const struct kobj_type *ktype = get_ktype(kobj); |
c84a3b27 | 60 | const struct kobj_ns_type_operations *ops; |
e34ff490 TH |
61 | int error; |
62 | ||
63 | error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj)); | |
c84a3b27 TH |
64 | if (error) |
65 | return error; | |
66 | ||
aa30f47c KB |
67 | if (ktype) { |
68 | error = sysfs_create_groups(kobj, ktype->default_groups); | |
69 | if (error) { | |
70 | sysfs_remove_dir(kobj); | |
71 | return error; | |
72 | } | |
73 | } | |
74 | ||
26ea12de TH |
75 | /* |
76 | * @kobj->sd may be deleted by an ancestor going away. Hold an | |
77 | * extra reference so that it stays until @kobj is gone. | |
78 | */ | |
79 | sysfs_get(kobj->sd); | |
80 | ||
c84a3b27 TH |
81 | /* |
82 | * If @kobj has ns_ops, its children need to be filtered based on | |
83 | * their namespace tags. Enable namespace support on @kobj->sd. | |
84 | */ | |
85 | ops = kobj_child_ns_ops(kobj); | |
86 | if (ops) { | |
87 | BUG_ON(ops->type <= KOBJ_NS_TYPE_NONE); | |
88 | BUG_ON(ops->type >= KOBJ_NS_TYPES); | |
89 | BUG_ON(!kobj_ns_type_registered(ops->type)); | |
90 | ||
fa4cd451 | 91 | sysfs_enable_ns(kobj->sd); |
c84a3b27 TH |
92 | } |
93 | ||
94 | return 0; | |
1da177e4 LT |
95 | } |
96 | ||
33a0a1e3 | 97 | static int get_kobj_path_length(const struct kobject *kobj) |
1da177e4 LT |
98 | { |
99 | int length = 1; | |
33a0a1e3 | 100 | const struct kobject *parent = kobj; |
1da177e4 | 101 | |
e374a2bf | 102 | /* walk up the ancestors until we hit the one pointing to the |
1da177e4 LT |
103 | * root. |
104 | * Add 1 to strlen for leading '/' of each level. | |
105 | */ | |
106 | do { | |
b365b3da CE |
107 | if (kobject_name(parent) == NULL) |
108 | return 0; | |
1da177e4 LT |
109 | length += strlen(kobject_name(parent)) + 1; |
110 | parent = parent->parent; | |
111 | } while (parent); | |
112 | return length; | |
113 | } | |
114 | ||
3bb2a01c | 115 | static int fill_kobj_path(const struct kobject *kobj, char *path, int length) |
1da177e4 | 116 | { |
33a0a1e3 | 117 | const struct kobject *parent; |
1da177e4 LT |
118 | |
119 | --length; | |
120 | for (parent = kobj; parent; parent = parent->parent) { | |
121 | int cur = strlen(kobject_name(parent)); | |
122 | /* back up enough to print this name with '/' */ | |
123 | length -= cur; | |
3bb2a01c WH |
124 | if (length <= 0) |
125 | return -EINVAL; | |
77d2a24b | 126 | memcpy(path + length, kobject_name(parent), cur); |
1da177e4 LT |
127 | *(path + --length) = '/'; |
128 | } | |
129 | ||
9f66fa2a | 130 | pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj), |
810304db | 131 | kobj, __func__, path); |
3bb2a01c WH |
132 | |
133 | return 0; | |
1da177e4 LT |
134 | } |
135 | ||
136 | /** | |
8fd7c302 | 137 | * kobject_get_path() - Allocate memory and fill in the path for @kobj. |
1da177e4 LT |
138 | * @kobj: kobject in question, with which to build the path |
139 | * @gfp_mask: the allocation type used to allocate the path | |
72fd4a35 | 140 | * |
8fd7c302 | 141 | * Return: The newly allocated memory, caller must free with kfree(). |
1da177e4 | 142 | */ |
33a0a1e3 | 143 | char *kobject_get_path(const struct kobject *kobj, gfp_t gfp_mask) |
1da177e4 LT |
144 | { |
145 | char *path; | |
146 | int len; | |
147 | ||
3bb2a01c | 148 | retry: |
1da177e4 | 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; | |
3bb2a01c WH |
155 | if (fill_kobj_path(kobj, path, len)) { |
156 | kfree(path); | |
157 | goto retry; | |
158 | } | |
1da177e4 LT |
159 | |
160 | return path; | |
161 | } | |
80fc9f53 | 162 | EXPORT_SYMBOL_GPL(kobject_get_path); |
1da177e4 | 163 | |
0f4dafc0 KS |
164 | /* add the kobject to its kset's list */ |
165 | static void kobj_kset_join(struct kobject *kobj) | |
1da177e4 | 166 | { |
0f4dafc0 | 167 | if (!kobj->kset) |
31b9025a | 168 | return; |
0f4dafc0 KS |
169 | |
170 | kset_get(kobj->kset); | |
171 | spin_lock(&kobj->kset->list_lock); | |
172 | list_add_tail(&kobj->entry, &kobj->kset->list); | |
173 | spin_unlock(&kobj->kset->list_lock); | |
1da177e4 LT |
174 | } |
175 | ||
0f4dafc0 KS |
176 | /* remove the kobject from its kset's list */ |
177 | static void kobj_kset_leave(struct kobject *kobj) | |
178 | { | |
179 | if (!kobj->kset) | |
180 | return; | |
1da177e4 | 181 | |
0f4dafc0 KS |
182 | spin_lock(&kobj->kset->list_lock); |
183 | list_del_init(&kobj->entry); | |
184 | spin_unlock(&kobj->kset->list_lock); | |
185 | kset_put(kobj->kset); | |
186 | } | |
1da177e4 | 187 | |
e374a2bf | 188 | static void kobject_init_internal(struct kobject *kobj) |
1da177e4 | 189 | { |
0f4dafc0 KS |
190 | if (!kobj) |
191 | return; | |
192 | kref_init(&kobj->kref); | |
193 | INIT_LIST_HEAD(&kobj->entry); | |
a4573c48 GKH |
194 | kobj->state_in_sysfs = 0; |
195 | kobj->state_add_uevent_sent = 0; | |
196 | kobj->state_remove_uevent_sent = 0; | |
197 | kobj->state_initialized = 1; | |
1da177e4 LT |
198 | } |
199 | ||
0f4dafc0 | 200 | |
9e7bbccd | 201 | static int kobject_add_internal(struct kobject *kobj) |
1da177e4 LT |
202 | { |
203 | int error = 0; | |
e374a2bf | 204 | struct kobject *parent; |
1da177e4 | 205 | |
0f4dafc0 | 206 | if (!kobj) |
1da177e4 | 207 | return -ENOENT; |
0f4dafc0 | 208 | |
af5ca3f4 | 209 | if (!kobj->name || !kobj->name[0]) { |
82d1f117 AS |
210 | WARN(1, |
211 | "kobject: (%p): attempted to be registered with empty name!\n", | |
212 | kobj); | |
c171fef5 GKH |
213 | return -EINVAL; |
214 | } | |
1da177e4 | 215 | |
0f4dafc0 | 216 | parent = kobject_get(kobj->parent); |
1da177e4 | 217 | |
0f4dafc0 | 218 | /* join kset if set, use it as parent if we do not already have one */ |
1da177e4 | 219 | if (kobj->kset) { |
0f4dafc0 | 220 | if (!parent) |
1da177e4 | 221 | parent = kobject_get(&kobj->kset->kobj); |
0f4dafc0 | 222 | kobj_kset_join(kobj); |
460f7e9a | 223 | kobj->parent = parent; |
1da177e4 | 224 | } |
1da177e4 | 225 | |
0f4dafc0 | 226 | pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n", |
810304db | 227 | kobject_name(kobj), kobj, __func__, |
0f4dafc0 | 228 | parent ? kobject_name(parent) : "<NULL>", |
e374a2bf | 229 | kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>"); |
0f4dafc0 | 230 | |
90bc6135 | 231 | error = create_dir(kobj); |
1da177e4 | 232 | if (error) { |
0f4dafc0 KS |
233 | kobj_kset_leave(kobj); |
234 | kobject_put(parent); | |
235 | kobj->parent = NULL; | |
dcd0da00 GKH |
236 | |
237 | /* be noisy on error issues */ | |
238 | if (error == -EEXIST) | |
3e14c6ab DV |
239 | pr_err("%s failed for %s with -EEXIST, don't try to register things with the same name in the same directory.\n", |
240 | __func__, kobject_name(kobj)); | |
dcd0da00 | 241 | else |
3e14c6ab DV |
242 | pr_err("%s failed for %s (error: %d parent: %s)\n", |
243 | __func__, kobject_name(kobj), error, | |
244 | parent ? kobject_name(parent) : "'none'"); | |
0f4dafc0 KS |
245 | } else |
246 | kobj->state_in_sysfs = 1; | |
1da177e4 LT |
247 | |
248 | return error; | |
249 | } | |
250 | ||
663a4743 | 251 | /** |
ed856349 | 252 | * kobject_set_name_vargs() - Set the name of a kobject. |
663a4743 GKH |
253 | * @kobj: struct kobject to set the name of |
254 | * @fmt: format string used to build the name | |
255 | * @vargs: vargs to format the string. | |
256 | */ | |
1fa5ae85 | 257 | int kobject_set_name_vargs(struct kobject *kobj, const char *fmt, |
663a4743 GKH |
258 | va_list vargs) |
259 | { | |
f773f32d | 260 | const char *s; |
663a4743 | 261 | |
8a577ffc KS |
262 | if (kobj->name && !fmt) |
263 | return 0; | |
264 | ||
f773f32d | 265 | s = kvasprintf_const(GFP_KERNEL, fmt, vargs); |
2abf114f | 266 | if (!s) |
a4ca6617 | 267 | return -ENOMEM; |
663a4743 | 268 | |
f773f32d RV |
269 | /* |
270 | * ewww... some of these buggers have '/' in the name ... If | |
271 | * that's the case, we need to make sure we have an actual | |
272 | * allocated copy to modify, since kvasprintf_const may have | |
273 | * returned something from .rodata. | |
274 | */ | |
275 | if (strchr(s, '/')) { | |
276 | char *t; | |
277 | ||
278 | t = kstrdup(s, GFP_KERNEL); | |
279 | kfree_const(s); | |
280 | if (!t) | |
281 | return -ENOMEM; | |
282 | strreplace(t, '/', '!'); | |
283 | s = t; | |
284 | } | |
285 | kfree_const(kobj->name); | |
2abf114f | 286 | kobj->name = s; |
9f255651 | 287 | |
663a4743 GKH |
288 | return 0; |
289 | } | |
1da177e4 LT |
290 | |
291 | /** | |
ed856349 | 292 | * kobject_set_name() - Set the name of a kobject. |
663a4743 | 293 | * @kobj: struct kobject to set the name of |
8c4606b1 | 294 | * @fmt: format string used to build the name |
1da177e4 | 295 | * |
8c4606b1 GKH |
296 | * This sets the name of the kobject. If you have already added the |
297 | * kobject to the system, you must call kobject_rename() in order to | |
298 | * change the name of the kobject. | |
1da177e4 | 299 | */ |
663a4743 | 300 | int kobject_set_name(struct kobject *kobj, const char *fmt, ...) |
1da177e4 | 301 | { |
a4ca6617 | 302 | va_list vargs; |
663a4743 | 303 | int retval; |
1da177e4 | 304 | |
a4ca6617 KS |
305 | va_start(vargs, fmt); |
306 | retval = kobject_set_name_vargs(kobj, fmt, vargs); | |
307 | va_end(vargs); | |
1da177e4 | 308 | |
663a4743 | 309 | return retval; |
1da177e4 | 310 | } |
1da177e4 LT |
311 | EXPORT_SYMBOL(kobject_set_name); |
312 | ||
e86000d0 | 313 | /** |
ed856349 | 314 | * kobject_init() - Initialize a kobject structure. |
e86000d0 GKH |
315 | * @kobj: pointer to the kobject to initialize |
316 | * @ktype: pointer to the ktype for this kobject. | |
317 | * | |
318 | * This function will properly initialize a kobject such that it can then | |
319 | * be passed to the kobject_add() call. | |
320 | * | |
321 | * After this function is called, the kobject MUST be cleaned up by a call | |
322 | * to kobject_put(), not by a call to kfree directly to ensure that all of | |
323 | * the memory is cleaned up properly. | |
324 | */ | |
ee6d3dd4 | 325 | void kobject_init(struct kobject *kobj, const struct kobj_type *ktype) |
e86000d0 GKH |
326 | { |
327 | char *err_str; | |
328 | ||
329 | if (!kobj) { | |
330 | err_str = "invalid kobject pointer!"; | |
331 | goto error; | |
332 | } | |
333 | if (!ktype) { | |
334 | err_str = "must have a ktype to be initialized properly!\n"; | |
335 | goto error; | |
336 | } | |
0f4dafc0 | 337 | if (kobj->state_initialized) { |
e86000d0 | 338 | /* do not error out as sometimes we can recover */ |
82d1f117 AS |
339 | pr_err("kobject (%p): tried to init an initialized object, something is seriously wrong.\n", |
340 | kobj); | |
e86000d0 GKH |
341 | dump_stack(); |
342 | } | |
343 | ||
a4573c48 | 344 | kobject_init_internal(kobj); |
e86000d0 GKH |
345 | kobj->ktype = ktype; |
346 | return; | |
347 | ||
348 | error: | |
82d1f117 | 349 | pr_err("kobject (%p): %s\n", kobj, err_str); |
e86000d0 GKH |
350 | dump_stack(); |
351 | } | |
f9cb074b | 352 | EXPORT_SYMBOL(kobject_init); |
e86000d0 | 353 | |
8db14860 NI |
354 | static __printf(3, 0) int kobject_add_varg(struct kobject *kobj, |
355 | struct kobject *parent, | |
356 | const char *fmt, va_list vargs) | |
244f6cee | 357 | { |
244f6cee GKH |
358 | int retval; |
359 | ||
a4ca6617 | 360 | retval = kobject_set_name_vargs(kobj, fmt, vargs); |
244f6cee | 361 | if (retval) { |
82d1f117 | 362 | pr_err("kobject: can not set name properly!\n"); |
244f6cee GKH |
363 | return retval; |
364 | } | |
365 | kobj->parent = parent; | |
9e7bbccd | 366 | return kobject_add_internal(kobj); |
244f6cee GKH |
367 | } |
368 | ||
369 | /** | |
ed856349 | 370 | * kobject_add() - The main kobject add function. |
244f6cee GKH |
371 | * @kobj: the kobject to add |
372 | * @parent: pointer to the parent of the kobject. | |
373 | * @fmt: format to name the kobject with. | |
374 | * | |
375 | * The kobject name is set and added to the kobject hierarchy in this | |
376 | * function. | |
377 | * | |
378 | * If @parent is set, then the parent of the @kobj will be set to it. | |
379 | * If @parent is NULL, then the parent of the @kobj will be set to the | |
9705710e | 380 | * kobject associated with the kset assigned to this kobject. If no kset |
244f6cee GKH |
381 | * is assigned to the kobject, then the kobject will be located in the |
382 | * root of the sysfs tree. | |
383 | * | |
0f4dafc0 | 384 | * Note, no "add" uevent will be created with this call, the caller should set |
244f6cee GKH |
385 | * up all of the necessary sysfs files for the object and then call |
386 | * kobject_uevent() with the UEVENT_ADD parameter to ensure that | |
387 | * userspace is properly notified of this kobject's creation. | |
92067f84 TH |
388 | * |
389 | * Return: If this function returns an error, kobject_put() must be | |
390 | * called to properly clean up the memory associated with the | |
391 | * object. Under no instance should the kobject that is passed | |
392 | * to this function be directly freed with a call to kfree(), | |
393 | * that can leak memory. | |
394 | * | |
70e16a62 GKH |
395 | * If this function returns success, kobject_put() must also be called |
396 | * in order to properly clean up the memory associated with the object. | |
397 | * | |
398 | * In short, once this function is called, kobject_put() MUST be called | |
399 | * when the use of the object is finished in order to properly free | |
400 | * everything. | |
244f6cee | 401 | */ |
b2d6db58 GKH |
402 | int kobject_add(struct kobject *kobj, struct kobject *parent, |
403 | const char *fmt, ...) | |
244f6cee GKH |
404 | { |
405 | va_list args; | |
406 | int retval; | |
407 | ||
408 | if (!kobj) | |
409 | return -EINVAL; | |
410 | ||
0f4dafc0 | 411 | if (!kobj->state_initialized) { |
82d1f117 | 412 | pr_err("kobject '%s' (%p): tried to add an uninitialized object, something is seriously wrong.\n", |
0f4dafc0 KS |
413 | kobject_name(kobj), kobj); |
414 | dump_stack(); | |
415 | return -EINVAL; | |
416 | } | |
244f6cee GKH |
417 | va_start(args, fmt); |
418 | retval = kobject_add_varg(kobj, parent, fmt, args); | |
419 | va_end(args); | |
420 | ||
421 | return retval; | |
422 | } | |
b2d6db58 | 423 | EXPORT_SYMBOL(kobject_add); |
244f6cee | 424 | |
c11c4154 | 425 | /** |
ed856349 TH |
426 | * kobject_init_and_add() - Initialize a kobject structure and add it to |
427 | * the kobject hierarchy. | |
c11c4154 GKH |
428 | * @kobj: pointer to the kobject to initialize |
429 | * @ktype: pointer to the ktype for this kobject. | |
430 | * @parent: pointer to the parent of this kobject. | |
431 | * @fmt: the name of the kobject. | |
432 | * | |
1fd7c3b4 TH |
433 | * This function combines the call to kobject_init() and kobject_add(). |
434 | * | |
435 | * If this function returns an error, kobject_put() must be called to | |
436 | * properly clean up the memory associated with the object. This is the | |
437 | * same type of error handling after a call to kobject_add() and kobject | |
438 | * lifetime rules are the same here. | |
c11c4154 | 439 | */ |
ee6d3dd4 | 440 | int kobject_init_and_add(struct kobject *kobj, const struct kobj_type *ktype, |
c11c4154 GKH |
441 | struct kobject *parent, const char *fmt, ...) |
442 | { | |
443 | va_list args; | |
444 | int retval; | |
445 | ||
f9cb074b | 446 | kobject_init(kobj, ktype); |
c11c4154 GKH |
447 | |
448 | va_start(args, fmt); | |
449 | retval = kobject_add_varg(kobj, parent, fmt, args); | |
450 | va_end(args); | |
451 | ||
452 | return retval; | |
453 | } | |
454 | EXPORT_SYMBOL_GPL(kobject_init_and_add); | |
455 | ||
1da177e4 | 456 | /** |
ed856349 | 457 | * kobject_rename() - Change the name of an object. |
e374a2bf GKH |
458 | * @kobj: object in question. |
459 | * @new_name: object's new name | |
030c1d2b EB |
460 | * |
461 | * It is the responsibility of the caller to provide mutual | |
462 | * exclusion between two different calls of kobject_rename | |
463 | * on the same kobject and to ensure that new_name is valid and | |
464 | * won't conflict with other kobjects. | |
1da177e4 | 465 | */ |
e374a2bf | 466 | int kobject_rename(struct kobject *kobj, const char *new_name) |
1da177e4 LT |
467 | { |
468 | int error = 0; | |
ca2f37db | 469 | const char *devpath = NULL; |
0b4a4fea | 470 | const char *dup_name = NULL, *name; |
ca2f37db JT |
471 | char *devpath_string = NULL; |
472 | char *envp[2]; | |
1da177e4 LT |
473 | |
474 | kobj = kobject_get(kobj); | |
475 | if (!kobj) | |
476 | return -EINVAL; | |
122f8ec7 LY |
477 | if (!kobj->parent) { |
478 | kobject_put(kobj); | |
b592fcfe | 479 | return -EINVAL; |
122f8ec7 | 480 | } |
ca2f37db JT |
481 | |
482 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
483 | if (!devpath) { | |
484 | error = -ENOMEM; | |
485 | goto out; | |
486 | } | |
487 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
488 | if (!devpath_string) { | |
489 | error = -ENOMEM; | |
490 | goto out; | |
491 | } | |
492 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
493 | envp[0] = devpath_string; | |
494 | envp[1] = NULL; | |
ca2f37db | 495 | |
f773f32d | 496 | name = dup_name = kstrdup_const(new_name, GFP_KERNEL); |
0b4a4fea EB |
497 | if (!name) { |
498 | error = -ENOMEM; | |
499 | goto out; | |
500 | } | |
501 | ||
e34ff490 | 502 | error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj)); |
0b4a4fea EB |
503 | if (error) |
504 | goto out; | |
505 | ||
506 | /* Install the new kobject name */ | |
507 | dup_name = kobj->name; | |
508 | kobj->name = name; | |
ca2f37db JT |
509 | |
510 | /* This function is mostly/only used for network interface. | |
511 | * Some hotplug package track interfaces by their name and | |
512 | * therefore want to know when the name is changed by the user. */ | |
0b4a4fea | 513 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); |
ca2f37db JT |
514 | |
515 | out: | |
f773f32d | 516 | kfree_const(dup_name); |
ca2f37db JT |
517 | kfree(devpath_string); |
518 | kfree(devpath); | |
b592fcfe EB |
519 | kobject_put(kobj); |
520 | ||
521 | return error; | |
522 | } | |
8344b568 | 523 | EXPORT_SYMBOL_GPL(kobject_rename); |
b592fcfe | 524 | |
8a82472f | 525 | /** |
ed856349 | 526 | * kobject_move() - Move object to another parent. |
e374a2bf GKH |
527 | * @kobj: object in question. |
528 | * @new_parent: object's new parent (can be NULL) | |
8a82472f | 529 | */ |
8a82472f CH |
530 | int kobject_move(struct kobject *kobj, struct kobject *new_parent) |
531 | { | |
532 | int error; | |
533 | struct kobject *old_parent; | |
534 | const char *devpath = NULL; | |
535 | char *devpath_string = NULL; | |
536 | char *envp[2]; | |
537 | ||
538 | kobj = kobject_get(kobj); | |
539 | if (!kobj) | |
540 | return -EINVAL; | |
541 | new_parent = kobject_get(new_parent); | |
542 | if (!new_parent) { | |
c744aeae CH |
543 | if (kobj->kset) |
544 | new_parent = kobject_get(&kobj->kset->kobj); | |
8a82472f | 545 | } |
e34ff490 | 546 | |
8a82472f CH |
547 | /* old object path */ |
548 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
549 | if (!devpath) { | |
550 | error = -ENOMEM; | |
551 | goto out; | |
552 | } | |
553 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
554 | if (!devpath_string) { | |
555 | error = -ENOMEM; | |
556 | goto out; | |
557 | } | |
558 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
559 | envp[0] = devpath_string; | |
560 | envp[1] = NULL; | |
e34ff490 | 561 | error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj)); |
8a82472f CH |
562 | if (error) |
563 | goto out; | |
564 | old_parent = kobj->parent; | |
565 | kobj->parent = new_parent; | |
9e993efb | 566 | new_parent = NULL; |
8a82472f CH |
567 | kobject_put(old_parent); |
568 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); | |
569 | out: | |
9e993efb | 570 | kobject_put(new_parent); |
8a82472f CH |
571 | kobject_put(kobj); |
572 | kfree(devpath_string); | |
573 | kfree(devpath); | |
574 | return error; | |
575 | } | |
24199d20 | 576 | EXPORT_SYMBOL_GPL(kobject_move); |
8a82472f | 577 | |
079ad2fb | 578 | static void __kobject_del(struct kobject *kobj) |
1da177e4 | 579 | { |
324a56e1 | 580 | struct kernfs_node *sd; |
3d378dc7 | 581 | const struct kobj_type *ktype; |
26ea12de | 582 | |
26ea12de | 583 | sd = kobj->sd; |
3d378dc7 | 584 | ktype = get_ktype(kobj); |
aa30f47c KB |
585 | |
586 | if (ktype) | |
587 | sysfs_remove_groups(kobj, ktype->default_groups); | |
588 | ||
0e5596c5 GKH |
589 | /* send "remove" if the caller did not do it but sent "add" */ |
590 | if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) { | |
591 | pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n", | |
592 | kobject_name(kobj), kobj); | |
593 | kobject_uevent(kobj, KOBJ_REMOVE); | |
594 | } | |
595 | ||
1da177e4 | 596 | sysfs_remove_dir(kobj); |
26ea12de TH |
597 | sysfs_put(sd); |
598 | ||
0f4dafc0 KS |
599 | kobj->state_in_sysfs = 0; |
600 | kobj_kset_leave(kobj); | |
0f4dafc0 | 601 | kobj->parent = NULL; |
1da177e4 | 602 | } |
079ad2fb HK |
603 | |
604 | /** | |
605 | * kobject_del() - Unlink kobject from hierarchy. | |
606 | * @kobj: object. | |
607 | * | |
608 | * This is the function that should be called to delete an object | |
609 | * successfully added via kobject_add(). | |
610 | */ | |
611 | void kobject_del(struct kobject *kobj) | |
612 | { | |
40b8b826 AS |
613 | struct kobject *parent; |
614 | ||
615 | if (!kobj) | |
616 | return; | |
079ad2fb | 617 | |
40b8b826 | 618 | parent = kobj->parent; |
079ad2fb HK |
619 | __kobject_del(kobj); |
620 | kobject_put(parent); | |
621 | } | |
fa40ae34 | 622 | EXPORT_SYMBOL(kobject_del); |
1da177e4 | 623 | |
1da177e4 | 624 | /** |
ed856349 | 625 | * kobject_get() - Increment refcount for object. |
e374a2bf | 626 | * @kobj: object. |
1da177e4 | 627 | */ |
e374a2bf | 628 | struct kobject *kobject_get(struct kobject *kobj) |
1da177e4 | 629 | { |
d82d54af EZ |
630 | if (kobj) { |
631 | if (!kobj->state_initialized) | |
82d1f117 AS |
632 | WARN(1, KERN_WARNING |
633 | "kobject: '%s' (%p): is not initialized, yet kobject_get() is being called.\n", | |
634 | kobject_name(kobj), kobj); | |
1da177e4 | 635 | kref_get(&kobj->kref); |
d82d54af | 636 | } |
1da177e4 LT |
637 | return kobj; |
638 | } | |
fa40ae34 | 639 | EXPORT_SYMBOL(kobject_get); |
1da177e4 | 640 | |
c70c176f | 641 | struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj) |
a49b7e82 | 642 | { |
c70c176f JK |
643 | if (!kobj) |
644 | return NULL; | |
a49b7e82 LT |
645 | if (!kref_get_unless_zero(&kobj->kref)) |
646 | kobj = NULL; | |
647 | return kobj; | |
648 | } | |
c70c176f | 649 | EXPORT_SYMBOL(kobject_get_unless_zero); |
a49b7e82 | 650 | |
18041f47 GKH |
651 | /* |
652 | * kobject_cleanup - free kobject resources. | |
653 | * @kobj: object to cleanup | |
1da177e4 | 654 | */ |
18041f47 | 655 | static void kobject_cleanup(struct kobject *kobj) |
1da177e4 | 656 | { |
079ad2fb | 657 | struct kobject *parent = kobj->parent; |
ee6d3dd4 | 658 | const struct kobj_type *t = get_ktype(kobj); |
af5ca3f4 | 659 | const char *name = kobj->name; |
1da177e4 | 660 | |
c817a67e RK |
661 | pr_debug("kobject: '%s' (%p): %s, parent %p\n", |
662 | kobject_name(kobj), kobj, __func__, kobj->parent); | |
0f4dafc0 KS |
663 | |
664 | if (t && !t->release) | |
0c1bc6b8 | 665 | pr_debug("kobject: '%s' (%p): does not have a release() function, it is broken and must be fixed. See Documentation/core-api/kobject.rst.\n", |
0f4dafc0 KS |
666 | kobject_name(kobj), kobj); |
667 | ||
0f4dafc0 KS |
668 | /* remove from sysfs if the caller did not do it */ |
669 | if (kobj->state_in_sysfs) { | |
670 | pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n", | |
671 | kobject_name(kobj), kobj); | |
079ad2fb HK |
672 | __kobject_del(kobj); |
673 | } else { | |
674 | /* avoid dropping the parent reference unnecessarily */ | |
675 | parent = NULL; | |
0f4dafc0 KS |
676 | } |
677 | ||
ce2c9cb0 | 678 | if (t && t->release) { |
0f4dafc0 KS |
679 | pr_debug("kobject: '%s' (%p): calling ktype release\n", |
680 | kobject_name(kobj), kobj); | |
1da177e4 | 681 | t->release(kobj); |
0f4dafc0 KS |
682 | } |
683 | ||
684 | /* free name if we allocated it */ | |
af5ca3f4 | 685 | if (name) { |
0f4dafc0 | 686 | pr_debug("kobject: '%s': free name\n", name); |
f773f32d | 687 | kfree_const(name); |
ce2c9cb0 | 688 | } |
079ad2fb HK |
689 | |
690 | kobject_put(parent); | |
1da177e4 LT |
691 | } |
692 | ||
c817a67e RK |
693 | #ifdef CONFIG_DEBUG_KOBJECT_RELEASE |
694 | static void kobject_delayed_cleanup(struct work_struct *work) | |
695 | { | |
696 | kobject_cleanup(container_of(to_delayed_work(work), | |
697 | struct kobject, release)); | |
698 | } | |
699 | #endif | |
700 | ||
1da177e4 LT |
701 | static void kobject_release(struct kref *kref) |
702 | { | |
c817a67e RK |
703 | struct kobject *kobj = container_of(kref, struct kobject, kref); |
704 | #ifdef CONFIG_DEBUG_KOBJECT_RELEASE | |
8032bf12 | 705 | unsigned long delay = HZ + HZ * get_random_u32_below(4); |
89c86a64 BH |
706 | pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n", |
707 | kobject_name(kobj), kobj, __func__, kobj->parent, delay); | |
c817a67e | 708 | INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup); |
89c86a64 BH |
709 | |
710 | schedule_delayed_work(&kobj->release, delay); | |
c817a67e RK |
711 | #else |
712 | kobject_cleanup(kobj); | |
713 | #endif | |
1da177e4 LT |
714 | } |
715 | ||
716 | /** | |
ed856349 | 717 | * kobject_put() - Decrement refcount for object. |
e374a2bf | 718 | * @kobj: object. |
1da177e4 | 719 | * |
e374a2bf | 720 | * Decrement the refcount, and if 0, call kobject_cleanup(). |
1da177e4 | 721 | */ |
e374a2bf | 722 | void kobject_put(struct kobject *kobj) |
1da177e4 | 723 | { |
c1ebdae5 | 724 | if (kobj) { |
d955c78a | 725 | if (!kobj->state_initialized) |
82d1f117 AS |
726 | WARN(1, KERN_WARNING |
727 | "kobject: '%s' (%p): is not initialized, yet kobject_put() is being called.\n", | |
728 | kobject_name(kobj), kobj); | |
1da177e4 | 729 | kref_put(&kobj->kref, kobject_release); |
c1ebdae5 | 730 | } |
1da177e4 | 731 | } |
fa40ae34 | 732 | EXPORT_SYMBOL(kobject_put); |
1da177e4 | 733 | |
3f9e3ee9 | 734 | static void dynamic_kobj_release(struct kobject *kobj) |
7423172a | 735 | { |
810304db | 736 | pr_debug("kobject: (%p): %s\n", kobj, __func__); |
7423172a JN |
737 | kfree(kobj); |
738 | } | |
739 | ||
dda6b81f | 740 | static const struct kobj_type dynamic_kobj_ktype = { |
386f275f KS |
741 | .release = dynamic_kobj_release, |
742 | .sysfs_ops = &kobj_sysfs_ops, | |
7423172a JN |
743 | }; |
744 | ||
43968d2f | 745 | /** |
ed856349 | 746 | * kobject_create() - Create a struct kobject dynamically. |
3f9e3ee9 GKH |
747 | * |
748 | * This function creates a kobject structure dynamically and sets it up | |
749 | * to be a "dynamic" kobject with a default release function set up. | |
750 | * | |
751 | * If the kobject was not able to be created, NULL will be returned. | |
43968d2f | 752 | * The kobject structure returned from here must be cleaned up with a |
f9cb074b | 753 | * call to kobject_put() and not kfree(), as kobject_init() has |
43968d2f | 754 | * already been called on this structure. |
3f9e3ee9 | 755 | */ |
8988bacd | 756 | static struct kobject *kobject_create(void) |
3f9e3ee9 GKH |
757 | { |
758 | struct kobject *kobj; | |
759 | ||
760 | kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); | |
761 | if (!kobj) | |
762 | return NULL; | |
763 | ||
f9cb074b | 764 | kobject_init(kobj, &dynamic_kobj_ktype); |
3f9e3ee9 GKH |
765 | return kobj; |
766 | } | |
767 | ||
768 | /** | |
ed856349 TH |
769 | * kobject_create_and_add() - Create a struct kobject dynamically and |
770 | * register it with sysfs. | |
9ff1f838 | 771 | * @name: the name for the kobject |
3f9e3ee9 GKH |
772 | * @parent: the parent kobject of this kobject, if any. |
773 | * | |
f70701a3 | 774 | * This function creates a kobject structure dynamically and registers it |
3f9e3ee9 | 775 | * with sysfs. When you are finished with this structure, call |
78a2d906 | 776 | * kobject_put() and the structure will be dynamically freed when |
3f9e3ee9 GKH |
777 | * it is no longer being used. |
778 | * | |
779 | * If the kobject was not able to be created, NULL will be returned. | |
780 | */ | |
781 | struct kobject *kobject_create_and_add(const char *name, struct kobject *parent) | |
782 | { | |
783 | struct kobject *kobj; | |
784 | int retval; | |
785 | ||
786 | kobj = kobject_create(); | |
787 | if (!kobj) | |
788 | return NULL; | |
789 | ||
b2d6db58 | 790 | retval = kobject_add(kobj, parent, "%s", name); |
3f9e3ee9 | 791 | if (retval) { |
82d1f117 | 792 | pr_warn("%s: kobject_add error: %d\n", __func__, retval); |
3f9e3ee9 GKH |
793 | kobject_put(kobj); |
794 | kobj = NULL; | |
795 | } | |
796 | return kobj; | |
797 | } | |
798 | EXPORT_SYMBOL_GPL(kobject_create_and_add); | |
799 | ||
1da177e4 | 800 | /** |
ed856349 | 801 | * kset_init() - Initialize a kset for use. |
e374a2bf | 802 | * @k: kset |
1da177e4 | 803 | */ |
e374a2bf | 804 | void kset_init(struct kset *k) |
1da177e4 | 805 | { |
e1543ddf | 806 | kobject_init_internal(&k->kobj); |
1da177e4 LT |
807 | INIT_LIST_HEAD(&k->list); |
808 | spin_lock_init(&k->list_lock); | |
809 | } | |
810 | ||
23b5212c KS |
811 | /* default kobject attribute operations */ |
812 | static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr, | |
813 | char *buf) | |
814 | { | |
815 | struct kobj_attribute *kattr; | |
816 | ssize_t ret = -EIO; | |
817 | ||
818 | kattr = container_of(attr, struct kobj_attribute, attr); | |
819 | if (kattr->show) | |
820 | ret = kattr->show(kobj, kattr, buf); | |
821 | return ret; | |
822 | } | |
823 | ||
824 | static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr, | |
825 | const char *buf, size_t count) | |
826 | { | |
827 | struct kobj_attribute *kattr; | |
828 | ssize_t ret = -EIO; | |
829 | ||
830 | kattr = container_of(attr, struct kobj_attribute, attr); | |
831 | if (kattr->store) | |
832 | ret = kattr->store(kobj, kattr, buf, count); | |
833 | return ret; | |
834 | } | |
835 | ||
52cf25d0 | 836 | const struct sysfs_ops kobj_sysfs_ops = { |
23b5212c KS |
837 | .show = kobj_attr_show, |
838 | .store = kobj_attr_store, | |
839 | }; | |
29dfe2dc | 840 | EXPORT_SYMBOL_GPL(kobj_sysfs_ops); |
1da177e4 | 841 | |
1da177e4 | 842 | /** |
ed856349 | 843 | * kset_register() - Initialize and add a kset. |
e374a2bf | 844 | * @k: kset. |
1662cea4 YY |
845 | * |
846 | * NOTE: On error, the kset.kobj.name allocated by() kobj_set_name() | |
847 | * is freed, it can not be used any more. | |
1da177e4 | 848 | */ |
e374a2bf | 849 | int kset_register(struct kset *k) |
1da177e4 | 850 | { |
80f03e34 KS |
851 | int err; |
852 | ||
31b9025a GKH |
853 | if (!k) |
854 | return -EINVAL; | |
80f03e34 | 855 | |
1da177e4 | 856 | kset_init(k); |
12e339ac | 857 | err = kobject_add_internal(&k->kobj); |
1662cea4 YY |
858 | if (err) { |
859 | kfree_const(k->kobj.name); | |
860 | /* Set it to NULL to avoid accessing bad pointer in callers. */ | |
861 | k->kobj.name = NULL; | |
80f03e34 | 862 | return err; |
1662cea4 | 863 | } |
80f03e34 KS |
864 | kobject_uevent(&k->kobj, KOBJ_ADD); |
865 | return 0; | |
1da177e4 | 866 | } |
fa40ae34 | 867 | EXPORT_SYMBOL(kset_register); |
1da177e4 | 868 | |
1da177e4 | 869 | /** |
ed856349 | 870 | * kset_unregister() - Remove a kset. |
e374a2bf | 871 | * @k: kset. |
1da177e4 | 872 | */ |
e374a2bf | 873 | void kset_unregister(struct kset *k) |
1da177e4 | 874 | { |
31b9025a GKH |
875 | if (!k) |
876 | return; | |
35a5fe69 | 877 | kobject_del(&k->kobj); |
78a2d906 | 878 | kobject_put(&k->kobj); |
1da177e4 | 879 | } |
fa40ae34 | 880 | EXPORT_SYMBOL(kset_unregister); |
1da177e4 | 881 | |
1da177e4 | 882 | /** |
ed856349 | 883 | * kset_find_obj() - Search for object in kset. |
e374a2bf GKH |
884 | * @kset: kset we're looking in. |
885 | * @name: object's name. | |
1da177e4 | 886 | * |
e374a2bf GKH |
887 | * Lock kset via @kset->subsys, and iterate over @kset->list, |
888 | * looking for a matching kobject. If matching object is found | |
889 | * take a reference and return the object. | |
1da177e4 | 890 | */ |
e374a2bf | 891 | struct kobject *kset_find_obj(struct kset *kset, const char *name) |
1da177e4 | 892 | { |
c6a2a3dc | 893 | struct kobject *k; |
e374a2bf | 894 | struct kobject *ret = NULL; |
1da177e4 LT |
895 | |
896 | spin_lock(&kset->list_lock); | |
c25d1dfb | 897 | |
c6a2a3dc | 898 | list_for_each_entry(k, &kset->list, entry) { |
e374a2bf | 899 | if (kobject_name(k) && !strcmp(kobject_name(k), name)) { |
a49b7e82 | 900 | ret = kobject_get_unless_zero(k); |
1da177e4 LT |
901 | break; |
902 | } | |
903 | } | |
c25d1dfb | 904 | |
1da177e4 LT |
905 | spin_unlock(&kset->list_lock); |
906 | return ret; | |
907 | } | |
2fe829ac | 908 | EXPORT_SYMBOL_GPL(kset_find_obj); |
1da177e4 | 909 | |
b727c702 GKH |
910 | static void kset_release(struct kobject *kobj) |
911 | { | |
912 | struct kset *kset = container_of(kobj, struct kset, kobj); | |
9f66fa2a | 913 | pr_debug("kobject: '%s' (%p): %s\n", |
810304db | 914 | kobject_name(kobj), kobj, __func__); |
b727c702 GKH |
915 | kfree(kset); |
916 | } | |
917 | ||
02a476d9 | 918 | static void kset_get_ownership(const struct kobject *kobj, kuid_t *uid, kgid_t *gid) |
d028b6f7 DT |
919 | { |
920 | if (kobj->parent) | |
921 | kobject_get_ownership(kobj->parent, uid, gid); | |
922 | } | |
923 | ||
dda6b81f | 924 | static const struct kobj_type kset_ktype = { |
386f275f | 925 | .sysfs_ops = &kobj_sysfs_ops, |
d028b6f7 DT |
926 | .release = kset_release, |
927 | .get_ownership = kset_get_ownership, | |
b727c702 GKH |
928 | }; |
929 | ||
930 | /** | |
ed856349 | 931 | * kset_create() - Create a struct kset dynamically. |
b727c702 GKH |
932 | * |
933 | * @name: the name for the kset | |
934 | * @uevent_ops: a struct kset_uevent_ops for the kset | |
935 | * @parent_kobj: the parent kobject of this kset, if any. | |
936 | * | |
937 | * This function creates a kset structure dynamically. This structure can | |
938 | * then be registered with the system and show up in sysfs with a call to | |
939 | * kset_register(). When you are finished with this structure, if | |
940 | * kset_register() has been called, call kset_unregister() and the | |
941 | * structure will be dynamically freed when it is no longer being used. | |
942 | * | |
943 | * If the kset was not able to be created, NULL will be returned. | |
944 | */ | |
945 | static struct kset *kset_create(const char *name, | |
9cd43611 | 946 | const struct kset_uevent_ops *uevent_ops, |
b727c702 GKH |
947 | struct kobject *parent_kobj) |
948 | { | |
949 | struct kset *kset; | |
d9cd8f37 | 950 | int retval; |
b727c702 GKH |
951 | |
952 | kset = kzalloc(sizeof(*kset), GFP_KERNEL); | |
953 | if (!kset) | |
954 | return NULL; | |
b7165ebb | 955 | retval = kobject_set_name(&kset->kobj, "%s", name); |
d9cd8f37 DY |
956 | if (retval) { |
957 | kfree(kset); | |
958 | return NULL; | |
959 | } | |
b727c702 GKH |
960 | kset->uevent_ops = uevent_ops; |
961 | kset->kobj.parent = parent_kobj; | |
962 | ||
963 | /* | |
386f275f | 964 | * The kobject of this kset will have a type of kset_ktype and belong to |
b727c702 GKH |
965 | * no kset itself. That way we can properly free it when it is |
966 | * finished being used. | |
967 | */ | |
386f275f | 968 | kset->kobj.ktype = &kset_ktype; |
b727c702 GKH |
969 | kset->kobj.kset = NULL; |
970 | ||
971 | return kset; | |
972 | } | |
973 | ||
974 | /** | |
ed856349 | 975 | * kset_create_and_add() - Create a struct kset dynamically and add it to sysfs. |
b727c702 GKH |
976 | * |
977 | * @name: the name for the kset | |
978 | * @uevent_ops: a struct kset_uevent_ops for the kset | |
979 | * @parent_kobj: the parent kobject of this kset, if any. | |
980 | * | |
981 | * This function creates a kset structure dynamically and registers it | |
982 | * with sysfs. When you are finished with this structure, call | |
983 | * kset_unregister() and the structure will be dynamically freed when it | |
984 | * is no longer being used. | |
985 | * | |
986 | * If the kset was not able to be created, NULL will be returned. | |
987 | */ | |
988 | struct kset *kset_create_and_add(const char *name, | |
9cd43611 | 989 | const struct kset_uevent_ops *uevent_ops, |
b727c702 GKH |
990 | struct kobject *parent_kobj) |
991 | { | |
992 | struct kset *kset; | |
993 | int error; | |
994 | ||
995 | kset = kset_create(name, uevent_ops, parent_kobj); | |
996 | if (!kset) | |
997 | return NULL; | |
998 | error = kset_register(kset); | |
999 | if (error) { | |
1000 | kfree(kset); | |
1001 | return NULL; | |
1002 | } | |
1003 | return kset; | |
1004 | } | |
1005 | EXPORT_SYMBOL_GPL(kset_create_and_add); | |
1006 | ||
bc451f20 EB |
1007 | |
1008 | static DEFINE_SPINLOCK(kobj_ns_type_lock); | |
1009 | static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES]; | |
1010 | ||
1011 | int kobj_ns_type_register(const struct kobj_ns_type_operations *ops) | |
1012 | { | |
1013 | enum kobj_ns_type type = ops->type; | |
1014 | int error; | |
1015 | ||
1016 | spin_lock(&kobj_ns_type_lock); | |
1017 | ||
1018 | error = -EINVAL; | |
1019 | if (type >= KOBJ_NS_TYPES) | |
1020 | goto out; | |
1021 | ||
1022 | error = -EINVAL; | |
1023 | if (type <= KOBJ_NS_TYPE_NONE) | |
1024 | goto out; | |
1025 | ||
1026 | error = -EBUSY; | |
1027 | if (kobj_ns_ops_tbl[type]) | |
1028 | goto out; | |
1029 | ||
1030 | error = 0; | |
1031 | kobj_ns_ops_tbl[type] = ops; | |
1032 | ||
1033 | out: | |
1034 | spin_unlock(&kobj_ns_type_lock); | |
1035 | return error; | |
1036 | } | |
1037 | ||
1038 | int kobj_ns_type_registered(enum kobj_ns_type type) | |
1039 | { | |
1040 | int registered = 0; | |
1041 | ||
1042 | spin_lock(&kobj_ns_type_lock); | |
1043 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES)) | |
1044 | registered = kobj_ns_ops_tbl[type] != NULL; | |
1045 | spin_unlock(&kobj_ns_type_lock); | |
1046 | ||
1047 | return registered; | |
1048 | } | |
1049 | ||
542aa246 | 1050 | const struct kobj_ns_type_operations *kobj_child_ns_ops(const struct kobject *parent) |
bc451f20 EB |
1051 | { |
1052 | const struct kobj_ns_type_operations *ops = NULL; | |
1053 | ||
41fb96a4 | 1054 | if (parent && parent->ktype && parent->ktype->child_ns_type) |
bc451f20 EB |
1055 | ops = parent->ktype->child_ns_type(parent); |
1056 | ||
1057 | return ops; | |
1058 | } | |
1059 | ||
542aa246 | 1060 | const struct kobj_ns_type_operations *kobj_ns_ops(const struct kobject *kobj) |
bc451f20 EB |
1061 | { |
1062 | return kobj_child_ns_ops(kobj->parent); | |
1063 | } | |
1064 | ||
7dc5dbc8 EB |
1065 | bool kobj_ns_current_may_mount(enum kobj_ns_type type) |
1066 | { | |
730d7d33 | 1067 | bool may_mount = true; |
7dc5dbc8 EB |
1068 | |
1069 | spin_lock(&kobj_ns_type_lock); | |
1070 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1071 | kobj_ns_ops_tbl[type]) | |
1072 | may_mount = kobj_ns_ops_tbl[type]->current_may_mount(); | |
1073 | spin_unlock(&kobj_ns_type_lock); | |
1074 | ||
1075 | return may_mount; | |
1076 | } | |
bc451f20 | 1077 | |
a685e089 | 1078 | void *kobj_ns_grab_current(enum kobj_ns_type type) |
bc451f20 | 1079 | { |
a685e089 | 1080 | void *ns = NULL; |
bc451f20 EB |
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]) | |
a685e089 | 1085 | ns = kobj_ns_ops_tbl[type]->grab_current_ns(); |
bc451f20 EB |
1086 | spin_unlock(&kobj_ns_type_lock); |
1087 | ||
1088 | return ns; | |
1089 | } | |
172856ea | 1090 | EXPORT_SYMBOL_GPL(kobj_ns_grab_current); |
bc451f20 EB |
1091 | |
1092 | const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk) | |
1093 | { | |
1094 | const void *ns = NULL; | |
1095 | ||
1096 | spin_lock(&kobj_ns_type_lock); | |
1097 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1098 | kobj_ns_ops_tbl[type]) | |
1099 | ns = kobj_ns_ops_tbl[type]->netlink_ns(sk); | |
1100 | spin_unlock(&kobj_ns_type_lock); | |
1101 | ||
1102 | return ns; | |
1103 | } | |
1104 | ||
1105 | const void *kobj_ns_initial(enum kobj_ns_type type) | |
1106 | { | |
1107 | const void *ns = NULL; | |
1108 | ||
1109 | spin_lock(&kobj_ns_type_lock); | |
1110 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1111 | kobj_ns_ops_tbl[type]) | |
1112 | ns = kobj_ns_ops_tbl[type]->initial_ns(); | |
1113 | spin_unlock(&kobj_ns_type_lock); | |
1114 | ||
1115 | return ns; | |
1116 | } | |
1117 | ||
a685e089 | 1118 | void kobj_ns_drop(enum kobj_ns_type type, void *ns) |
bc451f20 | 1119 | { |
a685e089 AV |
1120 | spin_lock(&kobj_ns_type_lock); |
1121 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1122 | kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns) | |
1123 | kobj_ns_ops_tbl[type]->drop_ns(ns); | |
1124 | spin_unlock(&kobj_ns_type_lock); | |
bc451f20 | 1125 | } |
172856ea | 1126 | EXPORT_SYMBOL_GPL(kobj_ns_drop); |