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 | ||
98406333 TW |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
1da177e4 LT |
15 | #include <linux/kobject.h> |
16 | #include <linux/string.h> | |
8bc3bcc9 | 17 | #include <linux/export.h> |
1da177e4 | 18 | #include <linux/stat.h> |
4e57b681 | 19 | #include <linux/slab.h> |
89c86a64 | 20 | #include <linux/random.h> |
1da177e4 | 21 | |
e34ff490 | 22 | /** |
ed856349 | 23 | * kobject_namespace() - Return @kobj's namespace tag. |
e34ff490 TH |
24 | * @kobj: kobject in question |
25 | * | |
26 | * Returns namespace tag of @kobj if its parent has namespace ops enabled | |
27 | * and thus @kobj should have a namespace tag associated with it. Returns | |
28 | * %NULL otherwise. | |
29 | */ | |
542aa246 | 30 | const void *kobject_namespace(const struct kobject *kobj) |
e34ff490 TH |
31 | { |
32 | const struct kobj_ns_type_operations *ns_ops = kobj_ns_ops(kobj); | |
33 | ||
34 | if (!ns_ops || ns_ops->type == KOBJ_NS_TYPE_NONE) | |
35 | return NULL; | |
36 | ||
a1212d27 | 37 | return kobj->ktype->namespace(kobj); |
e34ff490 TH |
38 | } |
39 | ||
5f81880d | 40 | /** |
ed856349 | 41 | * kobject_get_ownership() - Get sysfs ownership data for @kobj. |
5f81880d DT |
42 | * @kobj: kobject in question |
43 | * @uid: kernel user ID for sysfs objects | |
44 | * @gid: kernel group ID for sysfs objects | |
45 | * | |
46 | * Returns initial uid/gid pair that should be used when creating sysfs | |
47 | * representation of given kobject. Normally used to adjust ownership of | |
48 | * objects in a container. | |
49 | */ | |
02a476d9 | 50 | void kobject_get_ownership(const struct kobject *kobj, kuid_t *uid, kgid_t *gid) |
5f81880d DT |
51 | { |
52 | *uid = GLOBAL_ROOT_UID; | |
53 | *gid = GLOBAL_ROOT_GID; | |
54 | ||
55 | if (kobj->ktype->get_ownership) | |
56 | kobj->ktype->get_ownership(kobj, uid, gid); | |
57 | } | |
58 | ||
e374a2bf | 59 | static int create_dir(struct kobject *kobj) |
1da177e4 | 60 | { |
aa30f47c | 61 | const struct kobj_type *ktype = get_ktype(kobj); |
c84a3b27 | 62 | const struct kobj_ns_type_operations *ops; |
e34ff490 TH |
63 | int error; |
64 | ||
65 | error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj)); | |
c84a3b27 TH |
66 | if (error) |
67 | return error; | |
68 | ||
aa30f47c KB |
69 | if (ktype) { |
70 | error = sysfs_create_groups(kobj, ktype->default_groups); | |
71 | if (error) { | |
72 | sysfs_remove_dir(kobj); | |
73 | return error; | |
74 | } | |
75 | } | |
76 | ||
26ea12de TH |
77 | /* |
78 | * @kobj->sd may be deleted by an ancestor going away. Hold an | |
79 | * extra reference so that it stays until @kobj is gone. | |
80 | */ | |
81 | sysfs_get(kobj->sd); | |
82 | ||
c84a3b27 TH |
83 | /* |
84 | * If @kobj has ns_ops, its children need to be filtered based on | |
85 | * their namespace tags. Enable namespace support on @kobj->sd. | |
86 | */ | |
87 | ops = kobj_child_ns_ops(kobj); | |
88 | if (ops) { | |
89 | BUG_ON(ops->type <= KOBJ_NS_TYPE_NONE); | |
90 | BUG_ON(ops->type >= KOBJ_NS_TYPES); | |
91 | BUG_ON(!kobj_ns_type_registered(ops->type)); | |
92 | ||
fa4cd451 | 93 | sysfs_enable_ns(kobj->sd); |
c84a3b27 TH |
94 | } |
95 | ||
96 | return 0; | |
1da177e4 LT |
97 | } |
98 | ||
33a0a1e3 | 99 | static int get_kobj_path_length(const struct kobject *kobj) |
1da177e4 LT |
100 | { |
101 | int length = 1; | |
33a0a1e3 | 102 | const struct kobject *parent = kobj; |
1da177e4 | 103 | |
e374a2bf | 104 | /* walk up the ancestors until we hit the one pointing to the |
1da177e4 LT |
105 | * root. |
106 | * Add 1 to strlen for leading '/' of each level. | |
107 | */ | |
108 | do { | |
b365b3da CE |
109 | if (kobject_name(parent) == NULL) |
110 | return 0; | |
1da177e4 LT |
111 | length += strlen(kobject_name(parent)) + 1; |
112 | parent = parent->parent; | |
113 | } while (parent); | |
114 | return length; | |
115 | } | |
116 | ||
3bb2a01c | 117 | static int fill_kobj_path(const struct kobject *kobj, char *path, int length) |
1da177e4 | 118 | { |
33a0a1e3 | 119 | const struct kobject *parent; |
1da177e4 LT |
120 | |
121 | --length; | |
122 | for (parent = kobj; parent; parent = parent->parent) { | |
123 | int cur = strlen(kobject_name(parent)); | |
124 | /* back up enough to print this name with '/' */ | |
125 | length -= cur; | |
3bb2a01c WH |
126 | if (length <= 0) |
127 | return -EINVAL; | |
77d2a24b | 128 | memcpy(path + length, kobject_name(parent), cur); |
1da177e4 LT |
129 | *(path + --length) = '/'; |
130 | } | |
131 | ||
98406333 | 132 | pr_debug("'%s' (%p): %s: path = '%s'\n", kobject_name(kobj), |
810304db | 133 | kobj, __func__, path); |
3bb2a01c WH |
134 | |
135 | return 0; | |
1da177e4 LT |
136 | } |
137 | ||
138 | /** | |
8fd7c302 | 139 | * kobject_get_path() - Allocate memory and fill in the path for @kobj. |
1da177e4 LT |
140 | * @kobj: kobject in question, with which to build the path |
141 | * @gfp_mask: the allocation type used to allocate the path | |
72fd4a35 | 142 | * |
8fd7c302 | 143 | * Return: The newly allocated memory, caller must free with kfree(). |
1da177e4 | 144 | */ |
33a0a1e3 | 145 | char *kobject_get_path(const struct kobject *kobj, gfp_t gfp_mask) |
1da177e4 LT |
146 | { |
147 | char *path; | |
148 | int len; | |
149 | ||
3bb2a01c | 150 | retry: |
1da177e4 | 151 | len = get_kobj_path_length(kobj); |
b365b3da CE |
152 | if (len == 0) |
153 | return NULL; | |
4668edc3 | 154 | path = kzalloc(len, gfp_mask); |
1da177e4 LT |
155 | if (!path) |
156 | return NULL; | |
3bb2a01c WH |
157 | if (fill_kobj_path(kobj, path, len)) { |
158 | kfree(path); | |
159 | goto retry; | |
160 | } | |
1da177e4 LT |
161 | |
162 | return path; | |
163 | } | |
80fc9f53 | 164 | EXPORT_SYMBOL_GPL(kobject_get_path); |
1da177e4 | 165 | |
0f4dafc0 KS |
166 | /* add the kobject to its kset's list */ |
167 | static void kobj_kset_join(struct kobject *kobj) | |
1da177e4 | 168 | { |
0f4dafc0 | 169 | if (!kobj->kset) |
31b9025a | 170 | return; |
0f4dafc0 KS |
171 | |
172 | kset_get(kobj->kset); | |
173 | spin_lock(&kobj->kset->list_lock); | |
174 | list_add_tail(&kobj->entry, &kobj->kset->list); | |
175 | spin_unlock(&kobj->kset->list_lock); | |
1da177e4 LT |
176 | } |
177 | ||
0f4dafc0 KS |
178 | /* remove the kobject from its kset's list */ |
179 | static void kobj_kset_leave(struct kobject *kobj) | |
180 | { | |
181 | if (!kobj->kset) | |
182 | return; | |
1da177e4 | 183 | |
0f4dafc0 KS |
184 | spin_lock(&kobj->kset->list_lock); |
185 | list_del_init(&kobj->entry); | |
186 | spin_unlock(&kobj->kset->list_lock); | |
187 | kset_put(kobj->kset); | |
188 | } | |
1da177e4 | 189 | |
e374a2bf | 190 | static void kobject_init_internal(struct kobject *kobj) |
1da177e4 | 191 | { |
0f4dafc0 KS |
192 | if (!kobj) |
193 | return; | |
194 | kref_init(&kobj->kref); | |
195 | INIT_LIST_HEAD(&kobj->entry); | |
a4573c48 GKH |
196 | kobj->state_in_sysfs = 0; |
197 | kobj->state_add_uevent_sent = 0; | |
198 | kobj->state_remove_uevent_sent = 0; | |
199 | kobj->state_initialized = 1; | |
1da177e4 LT |
200 | } |
201 | ||
0f4dafc0 | 202 | |
9e7bbccd | 203 | static int kobject_add_internal(struct kobject *kobj) |
1da177e4 LT |
204 | { |
205 | int error = 0; | |
e374a2bf | 206 | struct kobject *parent; |
1da177e4 | 207 | |
0f4dafc0 | 208 | if (!kobj) |
1da177e4 | 209 | return -ENOENT; |
0f4dafc0 | 210 | |
af5ca3f4 | 211 | if (!kobj->name || !kobj->name[0]) { |
82d1f117 AS |
212 | WARN(1, |
213 | "kobject: (%p): attempted to be registered with empty name!\n", | |
214 | kobj); | |
c171fef5 GKH |
215 | return -EINVAL; |
216 | } | |
1da177e4 | 217 | |
0f4dafc0 | 218 | parent = kobject_get(kobj->parent); |
1da177e4 | 219 | |
0f4dafc0 | 220 | /* join kset if set, use it as parent if we do not already have one */ |
1da177e4 | 221 | if (kobj->kset) { |
0f4dafc0 | 222 | if (!parent) |
1da177e4 | 223 | parent = kobject_get(&kobj->kset->kobj); |
0f4dafc0 | 224 | kobj_kset_join(kobj); |
460f7e9a | 225 | kobj->parent = parent; |
1da177e4 | 226 | } |
1da177e4 | 227 | |
98406333 | 228 | pr_debug("'%s' (%p): %s: parent: '%s', set: '%s'\n", |
810304db | 229 | kobject_name(kobj), kobj, __func__, |
0f4dafc0 | 230 | parent ? kobject_name(parent) : "<NULL>", |
e374a2bf | 231 | kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>"); |
0f4dafc0 | 232 | |
90bc6135 | 233 | error = create_dir(kobj); |
1da177e4 | 234 | if (error) { |
0f4dafc0 KS |
235 | kobj_kset_leave(kobj); |
236 | kobject_put(parent); | |
237 | kobj->parent = NULL; | |
dcd0da00 GKH |
238 | |
239 | /* be noisy on error issues */ | |
240 | if (error == -EEXIST) | |
3e14c6ab DV |
241 | pr_err("%s failed for %s with -EEXIST, don't try to register things with the same name in the same directory.\n", |
242 | __func__, kobject_name(kobj)); | |
dcd0da00 | 243 | else |
3e14c6ab DV |
244 | pr_err("%s failed for %s (error: %d parent: %s)\n", |
245 | __func__, kobject_name(kobj), error, | |
246 | parent ? kobject_name(parent) : "'none'"); | |
0f4dafc0 KS |
247 | } else |
248 | kobj->state_in_sysfs = 1; | |
1da177e4 LT |
249 | |
250 | return error; | |
251 | } | |
252 | ||
663a4743 | 253 | /** |
ed856349 | 254 | * kobject_set_name_vargs() - Set the name of a kobject. |
663a4743 GKH |
255 | * @kobj: struct kobject to set the name of |
256 | * @fmt: format string used to build the name | |
257 | * @vargs: vargs to format the string. | |
258 | */ | |
1fa5ae85 | 259 | int kobject_set_name_vargs(struct kobject *kobj, const char *fmt, |
663a4743 GKH |
260 | va_list vargs) |
261 | { | |
f773f32d | 262 | const char *s; |
663a4743 | 263 | |
8a577ffc KS |
264 | if (kobj->name && !fmt) |
265 | return 0; | |
266 | ||
f773f32d | 267 | s = kvasprintf_const(GFP_KERNEL, fmt, vargs); |
2abf114f | 268 | if (!s) |
a4ca6617 | 269 | return -ENOMEM; |
663a4743 | 270 | |
f773f32d RV |
271 | /* |
272 | * ewww... some of these buggers have '/' in the name ... If | |
273 | * that's the case, we need to make sure we have an actual | |
274 | * allocated copy to modify, since kvasprintf_const may have | |
275 | * returned something from .rodata. | |
276 | */ | |
277 | if (strchr(s, '/')) { | |
278 | char *t; | |
279 | ||
280 | t = kstrdup(s, GFP_KERNEL); | |
281 | kfree_const(s); | |
282 | if (!t) | |
283 | return -ENOMEM; | |
b2f10148 | 284 | s = strreplace(t, '/', '!'); |
f773f32d RV |
285 | } |
286 | kfree_const(kobj->name); | |
2abf114f | 287 | kobj->name = s; |
9f255651 | 288 | |
663a4743 GKH |
289 | return 0; |
290 | } | |
1da177e4 LT |
291 | |
292 | /** | |
ed856349 | 293 | * kobject_set_name() - Set the name of a kobject. |
663a4743 | 294 | * @kobj: struct kobject to set the name of |
8c4606b1 | 295 | * @fmt: format string used to build the name |
1da177e4 | 296 | * |
8c4606b1 GKH |
297 | * This sets the name of the kobject. If you have already added the |
298 | * kobject to the system, you must call kobject_rename() in order to | |
299 | * change the name of the kobject. | |
1da177e4 | 300 | */ |
663a4743 | 301 | int kobject_set_name(struct kobject *kobj, const char *fmt, ...) |
1da177e4 | 302 | { |
a4ca6617 | 303 | va_list vargs; |
663a4743 | 304 | int retval; |
1da177e4 | 305 | |
a4ca6617 KS |
306 | va_start(vargs, fmt); |
307 | retval = kobject_set_name_vargs(kobj, fmt, vargs); | |
308 | va_end(vargs); | |
1da177e4 | 309 | |
663a4743 | 310 | return retval; |
1da177e4 | 311 | } |
1da177e4 LT |
312 | EXPORT_SYMBOL(kobject_set_name); |
313 | ||
e86000d0 | 314 | /** |
ed856349 | 315 | * kobject_init() - Initialize a kobject structure. |
e86000d0 GKH |
316 | * @kobj: pointer to the kobject to initialize |
317 | * @ktype: pointer to the ktype for this kobject. | |
318 | * | |
319 | * This function will properly initialize a kobject such that it can then | |
320 | * be passed to the kobject_add() call. | |
321 | * | |
322 | * After this function is called, the kobject MUST be cleaned up by a call | |
323 | * to kobject_put(), not by a call to kfree directly to ensure that all of | |
324 | * the memory is cleaned up properly. | |
325 | */ | |
ee6d3dd4 | 326 | void kobject_init(struct kobject *kobj, const struct kobj_type *ktype) |
e86000d0 GKH |
327 | { |
328 | char *err_str; | |
329 | ||
330 | if (!kobj) { | |
331 | err_str = "invalid kobject pointer!"; | |
332 | goto error; | |
333 | } | |
334 | if (!ktype) { | |
335 | err_str = "must have a ktype to be initialized properly!\n"; | |
336 | goto error; | |
337 | } | |
0f4dafc0 | 338 | if (kobj->state_initialized) { |
e86000d0 | 339 | /* do not error out as sometimes we can recover */ |
82d1f117 AS |
340 | pr_err("kobject (%p): tried to init an initialized object, something is seriously wrong.\n", |
341 | kobj); | |
64414da2 | 342 | dump_stack_lvl(KERN_ERR); |
e86000d0 GKH |
343 | } |
344 | ||
a4573c48 | 345 | kobject_init_internal(kobj); |
e86000d0 GKH |
346 | kobj->ktype = ktype; |
347 | return; | |
348 | ||
349 | error: | |
82d1f117 | 350 | pr_err("kobject (%p): %s\n", kobj, err_str); |
64414da2 | 351 | dump_stack_lvl(KERN_ERR); |
e86000d0 | 352 | } |
f9cb074b | 353 | EXPORT_SYMBOL(kobject_init); |
e86000d0 | 354 | |
8db14860 NI |
355 | static __printf(3, 0) int kobject_add_varg(struct kobject *kobj, |
356 | struct kobject *parent, | |
357 | const char *fmt, va_list vargs) | |
244f6cee | 358 | { |
244f6cee GKH |
359 | int retval; |
360 | ||
a4ca6617 | 361 | retval = kobject_set_name_vargs(kobj, fmt, vargs); |
244f6cee | 362 | if (retval) { |
98406333 | 363 | pr_err("can not set name properly!\n"); |
244f6cee GKH |
364 | return retval; |
365 | } | |
366 | kobj->parent = parent; | |
9e7bbccd | 367 | return kobject_add_internal(kobj); |
244f6cee GKH |
368 | } |
369 | ||
370 | /** | |
ed856349 | 371 | * kobject_add() - The main kobject add function. |
244f6cee GKH |
372 | * @kobj: the kobject to add |
373 | * @parent: pointer to the parent of the kobject. | |
374 | * @fmt: format to name the kobject with. | |
375 | * | |
376 | * The kobject name is set and added to the kobject hierarchy in this | |
377 | * function. | |
378 | * | |
379 | * If @parent is set, then the parent of the @kobj will be set to it. | |
380 | * If @parent is NULL, then the parent of the @kobj will be set to the | |
9705710e | 381 | * kobject associated with the kset assigned to this kobject. If no kset |
244f6cee GKH |
382 | * is assigned to the kobject, then the kobject will be located in the |
383 | * root of the sysfs tree. | |
384 | * | |
0f4dafc0 | 385 | * Note, no "add" uevent will be created with this call, the caller should set |
244f6cee GKH |
386 | * up all of the necessary sysfs files for the object and then call |
387 | * kobject_uevent() with the UEVENT_ADD parameter to ensure that | |
388 | * userspace is properly notified of this kobject's creation. | |
92067f84 TH |
389 | * |
390 | * Return: If this function returns an error, kobject_put() must be | |
391 | * called to properly clean up the memory associated with the | |
392 | * object. Under no instance should the kobject that is passed | |
393 | * to this function be directly freed with a call to kfree(), | |
394 | * that can leak memory. | |
395 | * | |
70e16a62 GKH |
396 | * If this function returns success, kobject_put() must also be called |
397 | * in order to properly clean up the memory associated with the object. | |
398 | * | |
399 | * In short, once this function is called, kobject_put() MUST be called | |
400 | * when the use of the object is finished in order to properly free | |
401 | * everything. | |
244f6cee | 402 | */ |
b2d6db58 GKH |
403 | int kobject_add(struct kobject *kobj, struct kobject *parent, |
404 | const char *fmt, ...) | |
244f6cee GKH |
405 | { |
406 | va_list args; | |
407 | int retval; | |
408 | ||
409 | if (!kobj) | |
410 | return -EINVAL; | |
411 | ||
0f4dafc0 | 412 | if (!kobj->state_initialized) { |
82d1f117 | 413 | pr_err("kobject '%s' (%p): tried to add an uninitialized object, something is seriously wrong.\n", |
0f4dafc0 | 414 | kobject_name(kobj), kobj); |
64414da2 | 415 | dump_stack_lvl(KERN_ERR); |
0f4dafc0 KS |
416 | return -EINVAL; |
417 | } | |
244f6cee GKH |
418 | va_start(args, fmt); |
419 | retval = kobject_add_varg(kobj, parent, fmt, args); | |
420 | va_end(args); | |
421 | ||
422 | return retval; | |
423 | } | |
b2d6db58 | 424 | EXPORT_SYMBOL(kobject_add); |
244f6cee | 425 | |
c11c4154 | 426 | /** |
ed856349 TH |
427 | * kobject_init_and_add() - Initialize a kobject structure and add it to |
428 | * the kobject hierarchy. | |
c11c4154 GKH |
429 | * @kobj: pointer to the kobject to initialize |
430 | * @ktype: pointer to the ktype for this kobject. | |
431 | * @parent: pointer to the parent of this kobject. | |
432 | * @fmt: the name of the kobject. | |
433 | * | |
1fd7c3b4 TH |
434 | * This function combines the call to kobject_init() and kobject_add(). |
435 | * | |
436 | * If this function returns an error, kobject_put() must be called to | |
437 | * properly clean up the memory associated with the object. This is the | |
438 | * same type of error handling after a call to kobject_add() and kobject | |
439 | * lifetime rules are the same here. | |
c11c4154 | 440 | */ |
ee6d3dd4 | 441 | int kobject_init_and_add(struct kobject *kobj, const struct kobj_type *ktype, |
c11c4154 GKH |
442 | struct kobject *parent, const char *fmt, ...) |
443 | { | |
444 | va_list args; | |
445 | int retval; | |
446 | ||
f9cb074b | 447 | kobject_init(kobj, ktype); |
c11c4154 GKH |
448 | |
449 | va_start(args, fmt); | |
450 | retval = kobject_add_varg(kobj, parent, fmt, args); | |
451 | va_end(args); | |
452 | ||
453 | return retval; | |
454 | } | |
455 | EXPORT_SYMBOL_GPL(kobject_init_and_add); | |
456 | ||
1da177e4 | 457 | /** |
ed856349 | 458 | * kobject_rename() - Change the name of an object. |
e374a2bf GKH |
459 | * @kobj: object in question. |
460 | * @new_name: object's new name | |
030c1d2b EB |
461 | * |
462 | * It is the responsibility of the caller to provide mutual | |
463 | * exclusion between two different calls of kobject_rename | |
464 | * on the same kobject and to ensure that new_name is valid and | |
465 | * won't conflict with other kobjects. | |
1da177e4 | 466 | */ |
e374a2bf | 467 | int kobject_rename(struct kobject *kobj, const char *new_name) |
1da177e4 LT |
468 | { |
469 | int error = 0; | |
ca2f37db | 470 | const char *devpath = NULL; |
0b4a4fea | 471 | const char *dup_name = NULL, *name; |
ca2f37db JT |
472 | char *devpath_string = NULL; |
473 | char *envp[2]; | |
1da177e4 LT |
474 | |
475 | kobj = kobject_get(kobj); | |
476 | if (!kobj) | |
477 | return -EINVAL; | |
122f8ec7 LY |
478 | if (!kobj->parent) { |
479 | kobject_put(kobj); | |
b592fcfe | 480 | return -EINVAL; |
122f8ec7 | 481 | } |
ca2f37db JT |
482 | |
483 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
484 | if (!devpath) { | |
485 | error = -ENOMEM; | |
486 | goto out; | |
487 | } | |
488 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
489 | if (!devpath_string) { | |
490 | error = -ENOMEM; | |
491 | goto out; | |
492 | } | |
493 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
494 | envp[0] = devpath_string; | |
495 | envp[1] = NULL; | |
ca2f37db | 496 | |
f773f32d | 497 | name = dup_name = kstrdup_const(new_name, GFP_KERNEL); |
0b4a4fea EB |
498 | if (!name) { |
499 | error = -ENOMEM; | |
500 | goto out; | |
501 | } | |
502 | ||
e34ff490 | 503 | error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj)); |
0b4a4fea EB |
504 | if (error) |
505 | goto out; | |
506 | ||
507 | /* Install the new kobject name */ | |
508 | dup_name = kobj->name; | |
509 | kobj->name = name; | |
ca2f37db JT |
510 | |
511 | /* This function is mostly/only used for network interface. | |
512 | * Some hotplug package track interfaces by their name and | |
513 | * therefore want to know when the name is changed by the user. */ | |
0b4a4fea | 514 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); |
ca2f37db JT |
515 | |
516 | out: | |
f773f32d | 517 | kfree_const(dup_name); |
ca2f37db JT |
518 | kfree(devpath_string); |
519 | kfree(devpath); | |
b592fcfe EB |
520 | kobject_put(kobj); |
521 | ||
522 | return error; | |
523 | } | |
8344b568 | 524 | EXPORT_SYMBOL_GPL(kobject_rename); |
b592fcfe | 525 | |
8a82472f | 526 | /** |
ed856349 | 527 | * kobject_move() - Move object to another parent. |
e374a2bf GKH |
528 | * @kobj: object in question. |
529 | * @new_parent: object's new parent (can be NULL) | |
8a82472f | 530 | */ |
8a82472f CH |
531 | int kobject_move(struct kobject *kobj, struct kobject *new_parent) |
532 | { | |
533 | int error; | |
534 | struct kobject *old_parent; | |
535 | const char *devpath = NULL; | |
536 | char *devpath_string = NULL; | |
537 | char *envp[2]; | |
538 | ||
539 | kobj = kobject_get(kobj); | |
540 | if (!kobj) | |
541 | return -EINVAL; | |
542 | new_parent = kobject_get(new_parent); | |
543 | if (!new_parent) { | |
c744aeae CH |
544 | if (kobj->kset) |
545 | new_parent = kobject_get(&kobj->kset->kobj); | |
8a82472f | 546 | } |
e34ff490 | 547 | |
8a82472f CH |
548 | /* old object path */ |
549 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
550 | if (!devpath) { | |
551 | error = -ENOMEM; | |
552 | goto out; | |
553 | } | |
554 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
555 | if (!devpath_string) { | |
556 | error = -ENOMEM; | |
557 | goto out; | |
558 | } | |
559 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
560 | envp[0] = devpath_string; | |
561 | envp[1] = NULL; | |
e34ff490 | 562 | error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj)); |
8a82472f CH |
563 | if (error) |
564 | goto out; | |
565 | old_parent = kobj->parent; | |
566 | kobj->parent = new_parent; | |
9e993efb | 567 | new_parent = NULL; |
8a82472f CH |
568 | kobject_put(old_parent); |
569 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); | |
570 | out: | |
9e993efb | 571 | kobject_put(new_parent); |
8a82472f CH |
572 | kobject_put(kobj); |
573 | kfree(devpath_string); | |
574 | kfree(devpath); | |
575 | return error; | |
576 | } | |
24199d20 | 577 | EXPORT_SYMBOL_GPL(kobject_move); |
8a82472f | 578 | |
079ad2fb | 579 | static void __kobject_del(struct kobject *kobj) |
1da177e4 | 580 | { |
324a56e1 | 581 | struct kernfs_node *sd; |
3d378dc7 | 582 | const struct kobj_type *ktype; |
26ea12de | 583 | |
26ea12de | 584 | sd = kobj->sd; |
3d378dc7 | 585 | ktype = get_ktype(kobj); |
aa30f47c KB |
586 | |
587 | if (ktype) | |
588 | sysfs_remove_groups(kobj, ktype->default_groups); | |
589 | ||
0e5596c5 GKH |
590 | /* send "remove" if the caller did not do it but sent "add" */ |
591 | if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) { | |
98406333 | 592 | pr_debug("'%s' (%p): auto cleanup 'remove' event\n", |
0e5596c5 GKH |
593 | kobject_name(kobj), kobj); |
594 | kobject_uevent(kobj, KOBJ_REMOVE); | |
595 | } | |
596 | ||
1da177e4 | 597 | sysfs_remove_dir(kobj); |
26ea12de TH |
598 | sysfs_put(sd); |
599 | ||
0f4dafc0 KS |
600 | kobj->state_in_sysfs = 0; |
601 | kobj_kset_leave(kobj); | |
0f4dafc0 | 602 | kobj->parent = NULL; |
1da177e4 | 603 | } |
079ad2fb HK |
604 | |
605 | /** | |
606 | * kobject_del() - Unlink kobject from hierarchy. | |
607 | * @kobj: object. | |
608 | * | |
609 | * This is the function that should be called to delete an object | |
610 | * successfully added via kobject_add(). | |
611 | */ | |
612 | void kobject_del(struct kobject *kobj) | |
613 | { | |
40b8b826 AS |
614 | struct kobject *parent; |
615 | ||
616 | if (!kobj) | |
617 | return; | |
079ad2fb | 618 | |
40b8b826 | 619 | parent = kobj->parent; |
079ad2fb HK |
620 | __kobject_del(kobj); |
621 | kobject_put(parent); | |
622 | } | |
fa40ae34 | 623 | EXPORT_SYMBOL(kobject_del); |
1da177e4 | 624 | |
1da177e4 | 625 | /** |
ed856349 | 626 | * kobject_get() - Increment refcount for object. |
e374a2bf | 627 | * @kobj: object. |
1da177e4 | 628 | */ |
e374a2bf | 629 | struct kobject *kobject_get(struct kobject *kobj) |
1da177e4 | 630 | { |
d82d54af EZ |
631 | if (kobj) { |
632 | if (!kobj->state_initialized) | |
82d1f117 AS |
633 | WARN(1, KERN_WARNING |
634 | "kobject: '%s' (%p): is not initialized, yet kobject_get() is being called.\n", | |
635 | kobject_name(kobj), kobj); | |
1da177e4 | 636 | kref_get(&kobj->kref); |
d82d54af | 637 | } |
1da177e4 LT |
638 | return kobj; |
639 | } | |
fa40ae34 | 640 | EXPORT_SYMBOL(kobject_get); |
1da177e4 | 641 | |
c70c176f | 642 | struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj) |
a49b7e82 | 643 | { |
c70c176f JK |
644 | if (!kobj) |
645 | return NULL; | |
a49b7e82 LT |
646 | if (!kref_get_unless_zero(&kobj->kref)) |
647 | kobj = NULL; | |
648 | return kobj; | |
649 | } | |
c70c176f | 650 | EXPORT_SYMBOL(kobject_get_unless_zero); |
a49b7e82 | 651 | |
18041f47 GKH |
652 | /* |
653 | * kobject_cleanup - free kobject resources. | |
654 | * @kobj: object to cleanup | |
1da177e4 | 655 | */ |
18041f47 | 656 | static void kobject_cleanup(struct kobject *kobj) |
1da177e4 | 657 | { |
079ad2fb | 658 | struct kobject *parent = kobj->parent; |
ee6d3dd4 | 659 | const struct kobj_type *t = get_ktype(kobj); |
af5ca3f4 | 660 | const char *name = kobj->name; |
1da177e4 | 661 | |
98406333 | 662 | pr_debug("'%s' (%p): %s, parent %p\n", |
c817a67e | 663 | kobject_name(kobj), kobj, __func__, kobj->parent); |
0f4dafc0 KS |
664 | |
665 | if (t && !t->release) | |
98406333 | 666 | pr_debug("'%s' (%p): does not have a release() function, it is broken and must be fixed. See Documentation/core-api/kobject.rst.\n", |
0f4dafc0 KS |
667 | kobject_name(kobj), kobj); |
668 | ||
0f4dafc0 KS |
669 | /* remove from sysfs if the caller did not do it */ |
670 | if (kobj->state_in_sysfs) { | |
98406333 | 671 | pr_debug("'%s' (%p): auto cleanup kobject_del\n", |
0f4dafc0 | 672 | kobject_name(kobj), kobj); |
079ad2fb HK |
673 | __kobject_del(kobj); |
674 | } else { | |
675 | /* avoid dropping the parent reference unnecessarily */ | |
676 | parent = NULL; | |
0f4dafc0 KS |
677 | } |
678 | ||
ce2c9cb0 | 679 | if (t && t->release) { |
98406333 | 680 | pr_debug("'%s' (%p): calling ktype release\n", |
0f4dafc0 | 681 | kobject_name(kobj), kobj); |
1da177e4 | 682 | t->release(kobj); |
0f4dafc0 KS |
683 | } |
684 | ||
685 | /* free name if we allocated it */ | |
af5ca3f4 | 686 | if (name) { |
98406333 | 687 | pr_debug("'%s': free name\n", name); |
f773f32d | 688 | kfree_const(name); |
ce2c9cb0 | 689 | } |
079ad2fb HK |
690 | |
691 | kobject_put(parent); | |
1da177e4 LT |
692 | } |
693 | ||
c817a67e RK |
694 | #ifdef CONFIG_DEBUG_KOBJECT_RELEASE |
695 | static void kobject_delayed_cleanup(struct work_struct *work) | |
696 | { | |
697 | kobject_cleanup(container_of(to_delayed_work(work), | |
698 | struct kobject, release)); | |
699 | } | |
700 | #endif | |
701 | ||
1da177e4 LT |
702 | static void kobject_release(struct kref *kref) |
703 | { | |
c817a67e RK |
704 | struct kobject *kobj = container_of(kref, struct kobject, kref); |
705 | #ifdef CONFIG_DEBUG_KOBJECT_RELEASE | |
8032bf12 | 706 | unsigned long delay = HZ + HZ * get_random_u32_below(4); |
98406333 TW |
707 | pr_info("'%s' (%p): %s, parent %p (delayed %ld)\n", |
708 | kobject_name(kobj), kobj, __func__, kobj->parent, delay); | |
c817a67e | 709 | INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup); |
89c86a64 BH |
710 | |
711 | schedule_delayed_work(&kobj->release, delay); | |
c817a67e RK |
712 | #else |
713 | kobject_cleanup(kobj); | |
714 | #endif | |
1da177e4 LT |
715 | } |
716 | ||
717 | /** | |
ed856349 | 718 | * kobject_put() - Decrement refcount for object. |
e374a2bf | 719 | * @kobj: object. |
1da177e4 | 720 | * |
e374a2bf | 721 | * Decrement the refcount, and if 0, call kobject_cleanup(). |
1da177e4 | 722 | */ |
e374a2bf | 723 | void kobject_put(struct kobject *kobj) |
1da177e4 | 724 | { |
c1ebdae5 | 725 | if (kobj) { |
d955c78a | 726 | if (!kobj->state_initialized) |
82d1f117 AS |
727 | WARN(1, KERN_WARNING |
728 | "kobject: '%s' (%p): is not initialized, yet kobject_put() is being called.\n", | |
729 | kobject_name(kobj), kobj); | |
1da177e4 | 730 | kref_put(&kobj->kref, kobject_release); |
c1ebdae5 | 731 | } |
1da177e4 | 732 | } |
fa40ae34 | 733 | EXPORT_SYMBOL(kobject_put); |
1da177e4 | 734 | |
3f9e3ee9 | 735 | static void dynamic_kobj_release(struct kobject *kobj) |
7423172a | 736 | { |
98406333 | 737 | pr_debug("(%p): %s\n", kobj, __func__); |
7423172a JN |
738 | kfree(kobj); |
739 | } | |
740 | ||
dda6b81f | 741 | static const struct kobj_type dynamic_kobj_ktype = { |
386f275f KS |
742 | .release = dynamic_kobj_release, |
743 | .sysfs_ops = &kobj_sysfs_ops, | |
7423172a JN |
744 | }; |
745 | ||
43968d2f | 746 | /** |
ed856349 | 747 | * kobject_create() - Create a struct kobject dynamically. |
3f9e3ee9 GKH |
748 | * |
749 | * This function creates a kobject structure dynamically and sets it up | |
750 | * to be a "dynamic" kobject with a default release function set up. | |
751 | * | |
752 | * If the kobject was not able to be created, NULL will be returned. | |
43968d2f | 753 | * The kobject structure returned from here must be cleaned up with a |
f9cb074b | 754 | * call to kobject_put() and not kfree(), as kobject_init() has |
43968d2f | 755 | * already been called on this structure. |
3f9e3ee9 | 756 | */ |
8988bacd | 757 | static struct kobject *kobject_create(void) |
3f9e3ee9 GKH |
758 | { |
759 | struct kobject *kobj; | |
760 | ||
761 | kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); | |
762 | if (!kobj) | |
763 | return NULL; | |
764 | ||
f9cb074b | 765 | kobject_init(kobj, &dynamic_kobj_ktype); |
3f9e3ee9 GKH |
766 | return kobj; |
767 | } | |
768 | ||
769 | /** | |
ed856349 TH |
770 | * kobject_create_and_add() - Create a struct kobject dynamically and |
771 | * register it with sysfs. | |
9ff1f838 | 772 | * @name: the name for the kobject |
3f9e3ee9 GKH |
773 | * @parent: the parent kobject of this kobject, if any. |
774 | * | |
f70701a3 | 775 | * This function creates a kobject structure dynamically and registers it |
3f9e3ee9 | 776 | * with sysfs. When you are finished with this structure, call |
78a2d906 | 777 | * kobject_put() and the structure will be dynamically freed when |
3f9e3ee9 GKH |
778 | * it is no longer being used. |
779 | * | |
780 | * If the kobject was not able to be created, NULL will be returned. | |
781 | */ | |
782 | struct kobject *kobject_create_and_add(const char *name, struct kobject *parent) | |
783 | { | |
784 | struct kobject *kobj; | |
785 | int retval; | |
786 | ||
787 | kobj = kobject_create(); | |
788 | if (!kobj) | |
789 | return NULL; | |
790 | ||
b2d6db58 | 791 | retval = kobject_add(kobj, parent, "%s", name); |
3f9e3ee9 | 792 | if (retval) { |
82d1f117 | 793 | pr_warn("%s: kobject_add error: %d\n", __func__, retval); |
3f9e3ee9 GKH |
794 | kobject_put(kobj); |
795 | kobj = NULL; | |
796 | } | |
797 | return kobj; | |
798 | } | |
799 | EXPORT_SYMBOL_GPL(kobject_create_and_add); | |
800 | ||
1da177e4 | 801 | /** |
ed856349 | 802 | * kset_init() - Initialize a kset for use. |
e374a2bf | 803 | * @k: kset |
1da177e4 | 804 | */ |
e374a2bf | 805 | void kset_init(struct kset *k) |
1da177e4 | 806 | { |
e1543ddf | 807 | kobject_init_internal(&k->kobj); |
1da177e4 LT |
808 | INIT_LIST_HEAD(&k->list); |
809 | spin_lock_init(&k->list_lock); | |
810 | } | |
811 | ||
23b5212c KS |
812 | /* default kobject attribute operations */ |
813 | static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr, | |
814 | char *buf) | |
815 | { | |
816 | struct kobj_attribute *kattr; | |
817 | ssize_t ret = -EIO; | |
818 | ||
819 | kattr = container_of(attr, struct kobj_attribute, attr); | |
820 | if (kattr->show) | |
821 | ret = kattr->show(kobj, kattr, buf); | |
822 | return ret; | |
823 | } | |
824 | ||
825 | static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr, | |
826 | const char *buf, size_t count) | |
827 | { | |
828 | struct kobj_attribute *kattr; | |
829 | ssize_t ret = -EIO; | |
830 | ||
831 | kattr = container_of(attr, struct kobj_attribute, attr); | |
832 | if (kattr->store) | |
833 | ret = kattr->store(kobj, kattr, buf, count); | |
834 | return ret; | |
835 | } | |
836 | ||
52cf25d0 | 837 | const struct sysfs_ops kobj_sysfs_ops = { |
23b5212c KS |
838 | .show = kobj_attr_show, |
839 | .store = kobj_attr_store, | |
840 | }; | |
29dfe2dc | 841 | EXPORT_SYMBOL_GPL(kobj_sysfs_ops); |
1da177e4 | 842 | |
1da177e4 | 843 | /** |
ed856349 | 844 | * kset_register() - Initialize and add a kset. |
e374a2bf | 845 | * @k: kset. |
1662cea4 YY |
846 | * |
847 | * NOTE: On error, the kset.kobj.name allocated by() kobj_set_name() | |
848 | * is freed, it can not be used any more. | |
1da177e4 | 849 | */ |
e374a2bf | 850 | int kset_register(struct kset *k) |
1da177e4 | 851 | { |
80f03e34 KS |
852 | int err; |
853 | ||
31b9025a GKH |
854 | if (!k) |
855 | return -EINVAL; | |
80f03e34 | 856 | |
1da177e4 | 857 | kset_init(k); |
12e339ac | 858 | err = kobject_add_internal(&k->kobj); |
1662cea4 YY |
859 | if (err) { |
860 | kfree_const(k->kobj.name); | |
861 | /* Set it to NULL to avoid accessing bad pointer in callers. */ | |
862 | k->kobj.name = NULL; | |
80f03e34 | 863 | return err; |
1662cea4 | 864 | } |
80f03e34 KS |
865 | kobject_uevent(&k->kobj, KOBJ_ADD); |
866 | return 0; | |
1da177e4 | 867 | } |
fa40ae34 | 868 | EXPORT_SYMBOL(kset_register); |
1da177e4 | 869 | |
1da177e4 | 870 | /** |
ed856349 | 871 | * kset_unregister() - Remove a kset. |
e374a2bf | 872 | * @k: kset. |
1da177e4 | 873 | */ |
e374a2bf | 874 | void kset_unregister(struct kset *k) |
1da177e4 | 875 | { |
31b9025a GKH |
876 | if (!k) |
877 | return; | |
35a5fe69 | 878 | kobject_del(&k->kobj); |
78a2d906 | 879 | kobject_put(&k->kobj); |
1da177e4 | 880 | } |
fa40ae34 | 881 | EXPORT_SYMBOL(kset_unregister); |
1da177e4 | 882 | |
1da177e4 | 883 | /** |
ed856349 | 884 | * kset_find_obj() - Search for object in kset. |
e374a2bf GKH |
885 | * @kset: kset we're looking in. |
886 | * @name: object's name. | |
1da177e4 | 887 | * |
e374a2bf GKH |
888 | * Lock kset via @kset->subsys, and iterate over @kset->list, |
889 | * looking for a matching kobject. If matching object is found | |
890 | * take a reference and return the object. | |
1da177e4 | 891 | */ |
e374a2bf | 892 | struct kobject *kset_find_obj(struct kset *kset, const char *name) |
1da177e4 | 893 | { |
c6a2a3dc | 894 | struct kobject *k; |
e374a2bf | 895 | struct kobject *ret = NULL; |
1da177e4 LT |
896 | |
897 | spin_lock(&kset->list_lock); | |
c25d1dfb | 898 | |
c6a2a3dc | 899 | list_for_each_entry(k, &kset->list, entry) { |
e374a2bf | 900 | if (kobject_name(k) && !strcmp(kobject_name(k), name)) { |
a49b7e82 | 901 | ret = kobject_get_unless_zero(k); |
1da177e4 LT |
902 | break; |
903 | } | |
904 | } | |
c25d1dfb | 905 | |
1da177e4 LT |
906 | spin_unlock(&kset->list_lock); |
907 | return ret; | |
908 | } | |
2fe829ac | 909 | EXPORT_SYMBOL_GPL(kset_find_obj); |
1da177e4 | 910 | |
b727c702 GKH |
911 | static void kset_release(struct kobject *kobj) |
912 | { | |
913 | struct kset *kset = container_of(kobj, struct kset, kobj); | |
98406333 | 914 | pr_debug("'%s' (%p): %s\n", |
810304db | 915 | kobject_name(kobj), kobj, __func__); |
b727c702 GKH |
916 | kfree(kset); |
917 | } | |
918 | ||
02a476d9 | 919 | static void kset_get_ownership(const struct kobject *kobj, kuid_t *uid, kgid_t *gid) |
d028b6f7 DT |
920 | { |
921 | if (kobj->parent) | |
922 | kobject_get_ownership(kobj->parent, uid, gid); | |
923 | } | |
924 | ||
dda6b81f | 925 | static const struct kobj_type kset_ktype = { |
386f275f | 926 | .sysfs_ops = &kobj_sysfs_ops, |
d028b6f7 DT |
927 | .release = kset_release, |
928 | .get_ownership = kset_get_ownership, | |
b727c702 GKH |
929 | }; |
930 | ||
931 | /** | |
ed856349 | 932 | * kset_create() - Create a struct kset dynamically. |
b727c702 GKH |
933 | * |
934 | * @name: the name for the kset | |
935 | * @uevent_ops: a struct kset_uevent_ops for the kset | |
936 | * @parent_kobj: the parent kobject of this kset, if any. | |
937 | * | |
938 | * This function creates a kset structure dynamically. This structure can | |
939 | * then be registered with the system and show up in sysfs with a call to | |
940 | * kset_register(). When you are finished with this structure, if | |
941 | * kset_register() has been called, call kset_unregister() and the | |
942 | * structure will be dynamically freed when it is no longer being used. | |
943 | * | |
944 | * If the kset was not able to be created, NULL will be returned. | |
945 | */ | |
946 | static struct kset *kset_create(const char *name, | |
9cd43611 | 947 | const struct kset_uevent_ops *uevent_ops, |
b727c702 GKH |
948 | struct kobject *parent_kobj) |
949 | { | |
950 | struct kset *kset; | |
d9cd8f37 | 951 | int retval; |
b727c702 GKH |
952 | |
953 | kset = kzalloc(sizeof(*kset), GFP_KERNEL); | |
954 | if (!kset) | |
955 | return NULL; | |
b7165ebb | 956 | retval = kobject_set_name(&kset->kobj, "%s", name); |
d9cd8f37 DY |
957 | if (retval) { |
958 | kfree(kset); | |
959 | return NULL; | |
960 | } | |
b727c702 GKH |
961 | kset->uevent_ops = uevent_ops; |
962 | kset->kobj.parent = parent_kobj; | |
963 | ||
964 | /* | |
386f275f | 965 | * The kobject of this kset will have a type of kset_ktype and belong to |
b727c702 GKH |
966 | * no kset itself. That way we can properly free it when it is |
967 | * finished being used. | |
968 | */ | |
386f275f | 969 | kset->kobj.ktype = &kset_ktype; |
b727c702 GKH |
970 | kset->kobj.kset = NULL; |
971 | ||
972 | return kset; | |
973 | } | |
974 | ||
975 | /** | |
ed856349 | 976 | * kset_create_and_add() - Create a struct kset dynamically and add it to sysfs. |
b727c702 GKH |
977 | * |
978 | * @name: the name for the kset | |
979 | * @uevent_ops: a struct kset_uevent_ops for the kset | |
980 | * @parent_kobj: the parent kobject of this kset, if any. | |
981 | * | |
982 | * This function creates a kset structure dynamically and registers it | |
983 | * with sysfs. When you are finished with this structure, call | |
984 | * kset_unregister() and the structure will be dynamically freed when it | |
985 | * is no longer being used. | |
986 | * | |
987 | * If the kset was not able to be created, NULL will be returned. | |
988 | */ | |
989 | struct kset *kset_create_and_add(const char *name, | |
9cd43611 | 990 | const struct kset_uevent_ops *uevent_ops, |
b727c702 GKH |
991 | struct kobject *parent_kobj) |
992 | { | |
993 | struct kset *kset; | |
994 | int error; | |
995 | ||
996 | kset = kset_create(name, uevent_ops, parent_kobj); | |
997 | if (!kset) | |
998 | return NULL; | |
999 | error = kset_register(kset); | |
1000 | if (error) { | |
1001 | kfree(kset); | |
1002 | return NULL; | |
1003 | } | |
1004 | return kset; | |
1005 | } | |
1006 | EXPORT_SYMBOL_GPL(kset_create_and_add); | |
1007 | ||
bc451f20 EB |
1008 | |
1009 | static DEFINE_SPINLOCK(kobj_ns_type_lock); | |
1010 | static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES]; | |
1011 | ||
1012 | int kobj_ns_type_register(const struct kobj_ns_type_operations *ops) | |
1013 | { | |
1014 | enum kobj_ns_type type = ops->type; | |
1015 | int error; | |
1016 | ||
1017 | spin_lock(&kobj_ns_type_lock); | |
1018 | ||
1019 | error = -EINVAL; | |
1020 | if (type >= KOBJ_NS_TYPES) | |
1021 | goto out; | |
1022 | ||
1023 | error = -EINVAL; | |
1024 | if (type <= KOBJ_NS_TYPE_NONE) | |
1025 | goto out; | |
1026 | ||
1027 | error = -EBUSY; | |
1028 | if (kobj_ns_ops_tbl[type]) | |
1029 | goto out; | |
1030 | ||
1031 | error = 0; | |
1032 | kobj_ns_ops_tbl[type] = ops; | |
1033 | ||
1034 | out: | |
1035 | spin_unlock(&kobj_ns_type_lock); | |
1036 | return error; | |
1037 | } | |
1038 | ||
1039 | int kobj_ns_type_registered(enum kobj_ns_type type) | |
1040 | { | |
1041 | int registered = 0; | |
1042 | ||
1043 | spin_lock(&kobj_ns_type_lock); | |
1044 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES)) | |
1045 | registered = kobj_ns_ops_tbl[type] != NULL; | |
1046 | spin_unlock(&kobj_ns_type_lock); | |
1047 | ||
1048 | return registered; | |
1049 | } | |
1050 | ||
542aa246 | 1051 | const struct kobj_ns_type_operations *kobj_child_ns_ops(const struct kobject *parent) |
bc451f20 EB |
1052 | { |
1053 | const struct kobj_ns_type_operations *ops = NULL; | |
1054 | ||
41fb96a4 | 1055 | if (parent && parent->ktype && parent->ktype->child_ns_type) |
bc451f20 EB |
1056 | ops = parent->ktype->child_ns_type(parent); |
1057 | ||
1058 | return ops; | |
1059 | } | |
1060 | ||
542aa246 | 1061 | const struct kobj_ns_type_operations *kobj_ns_ops(const struct kobject *kobj) |
bc451f20 EB |
1062 | { |
1063 | return kobj_child_ns_ops(kobj->parent); | |
1064 | } | |
1065 | ||
7dc5dbc8 EB |
1066 | bool kobj_ns_current_may_mount(enum kobj_ns_type type) |
1067 | { | |
730d7d33 | 1068 | bool may_mount = true; |
7dc5dbc8 EB |
1069 | |
1070 | spin_lock(&kobj_ns_type_lock); | |
1071 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1072 | kobj_ns_ops_tbl[type]) | |
1073 | may_mount = kobj_ns_ops_tbl[type]->current_may_mount(); | |
1074 | spin_unlock(&kobj_ns_type_lock); | |
1075 | ||
1076 | return may_mount; | |
1077 | } | |
bc451f20 | 1078 | |
a685e089 | 1079 | void *kobj_ns_grab_current(enum kobj_ns_type type) |
bc451f20 | 1080 | { |
a685e089 | 1081 | void *ns = NULL; |
bc451f20 EB |
1082 | |
1083 | spin_lock(&kobj_ns_type_lock); | |
1084 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1085 | kobj_ns_ops_tbl[type]) | |
a685e089 | 1086 | ns = kobj_ns_ops_tbl[type]->grab_current_ns(); |
bc451f20 EB |
1087 | spin_unlock(&kobj_ns_type_lock); |
1088 | ||
1089 | return ns; | |
1090 | } | |
172856ea | 1091 | EXPORT_SYMBOL_GPL(kobj_ns_grab_current); |
bc451f20 EB |
1092 | |
1093 | const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk) | |
1094 | { | |
1095 | const void *ns = NULL; | |
1096 | ||
1097 | spin_lock(&kobj_ns_type_lock); | |
1098 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1099 | kobj_ns_ops_tbl[type]) | |
1100 | ns = kobj_ns_ops_tbl[type]->netlink_ns(sk); | |
1101 | spin_unlock(&kobj_ns_type_lock); | |
1102 | ||
1103 | return ns; | |
1104 | } | |
1105 | ||
1106 | const void *kobj_ns_initial(enum kobj_ns_type type) | |
1107 | { | |
1108 | const void *ns = NULL; | |
1109 | ||
1110 | spin_lock(&kobj_ns_type_lock); | |
1111 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1112 | kobj_ns_ops_tbl[type]) | |
1113 | ns = kobj_ns_ops_tbl[type]->initial_ns(); | |
1114 | spin_unlock(&kobj_ns_type_lock); | |
1115 | ||
1116 | return ns; | |
1117 | } | |
1118 | ||
a685e089 | 1119 | void kobj_ns_drop(enum kobj_ns_type type, void *ns) |
bc451f20 | 1120 | { |
a685e089 AV |
1121 | spin_lock(&kobj_ns_type_lock); |
1122 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1123 | kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns) | |
1124 | kobj_ns_ops_tbl[type]->drop_ns(ns); | |
1125 | spin_unlock(&kobj_ns_type_lock); | |
bc451f20 | 1126 | } |
172856ea | 1127 | EXPORT_SYMBOL_GPL(kobj_ns_drop); |