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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * kobject.c - library routines for handling generic kernel objects | |
3 | * | |
4 | * Copyright (c) 2002-2003 Patrick Mochel <mochel@osdl.org> | |
f0e7e1bd GKH |
5 | * Copyright (c) 2006-2007 Greg Kroah-Hartman <greg@kroah.com> |
6 | * Copyright (c) 2006-2007 Novell Inc. | |
1da177e4 LT |
7 | * |
8 | * This file is released under the GPLv2. | |
9 | * | |
10 | * | |
11 | * Please see the file Documentation/kobject.txt for critical information | |
12 | * about using the kobject interface. | |
13 | */ | |
14 | ||
15 | #include <linux/kobject.h> | |
eee03164 | 16 | #include <linux/kobj_completion.h> |
1da177e4 | 17 | #include <linux/string.h> |
8bc3bcc9 | 18 | #include <linux/export.h> |
1da177e4 | 19 | #include <linux/stat.h> |
4e57b681 | 20 | #include <linux/slab.h> |
1da177e4 | 21 | |
e34ff490 TH |
22 | /** |
23 | * kobject_namespace - return @kobj's namespace tag | |
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 | */ | |
30 | const void *kobject_namespace(struct kobject *kobj) | |
31 | { | |
32 | const struct kobj_ns_type_operations *ns_ops = kobj_ns_ops(kobj); | |
cb26a311 | 33 | const void *ns; |
e34ff490 TH |
34 | |
35 | if (!ns_ops || ns_ops->type == KOBJ_NS_TYPE_NONE) | |
36 | return NULL; | |
37 | ||
cb26a311 TH |
38 | ns = kobj->ktype->namespace(kobj); |
39 | WARN_ON(!ns); /* @kobj in a namespace is required to have !NULL tag */ | |
40 | return ns; | |
e34ff490 TH |
41 | } |
42 | ||
e374a2bf GKH |
43 | /* |
44 | * populate_dir - populate directory with attributes. | |
45 | * @kobj: object we're working on. | |
1da177e4 | 46 | * |
e374a2bf GKH |
47 | * Most subsystems have a set of default attributes that are associated |
48 | * with an object that registers with them. This is a helper called during | |
49 | * object registration that loops through the default attributes of the | |
50 | * subsystem and creates attributes files for them in sysfs. | |
1da177e4 | 51 | */ |
e374a2bf | 52 | static int populate_dir(struct kobject *kobj) |
1da177e4 | 53 | { |
e374a2bf GKH |
54 | struct kobj_type *t = get_ktype(kobj); |
55 | struct attribute *attr; | |
1da177e4 LT |
56 | int error = 0; |
57 | int i; | |
e374a2bf | 58 | |
1da177e4 LT |
59 | if (t && t->default_attrs) { |
60 | for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) { | |
e374a2bf GKH |
61 | error = sysfs_create_file(kobj, attr); |
62 | if (error) | |
1da177e4 LT |
63 | break; |
64 | } | |
65 | } | |
66 | return error; | |
67 | } | |
68 | ||
e374a2bf | 69 | static int create_dir(struct kobject *kobj) |
1da177e4 | 70 | { |
e34ff490 TH |
71 | int error; |
72 | ||
73 | error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj)); | |
6b960610 | 74 | if (!error) { |
75 | error = populate_dir(kobj); | |
76 | if (error) | |
77 | sysfs_remove_dir(kobj); | |
1da177e4 | 78 | } |
26ea12de TH |
79 | |
80 | /* | |
81 | * @kobj->sd may be deleted by an ancestor going away. Hold an | |
82 | * extra reference so that it stays until @kobj is gone. | |
83 | */ | |
84 | sysfs_get(kobj->sd); | |
85 | ||
1da177e4 LT |
86 | return error; |
87 | } | |
88 | ||
1da177e4 LT |
89 | static int get_kobj_path_length(struct kobject *kobj) |
90 | { | |
91 | int length = 1; | |
e374a2bf | 92 | struct kobject *parent = kobj; |
1da177e4 | 93 | |
e374a2bf | 94 | /* walk up the ancestors until we hit the one pointing to the |
1da177e4 LT |
95 | * root. |
96 | * Add 1 to strlen for leading '/' of each level. | |
97 | */ | |
98 | do { | |
b365b3da CE |
99 | if (kobject_name(parent) == NULL) |
100 | return 0; | |
1da177e4 LT |
101 | length += strlen(kobject_name(parent)) + 1; |
102 | parent = parent->parent; | |
103 | } while (parent); | |
104 | return length; | |
105 | } | |
106 | ||
107 | static void fill_kobj_path(struct kobject *kobj, char *path, int length) | |
108 | { | |
e374a2bf | 109 | struct kobject *parent; |
1da177e4 LT |
110 | |
111 | --length; | |
112 | for (parent = kobj; parent; parent = parent->parent) { | |
113 | int cur = strlen(kobject_name(parent)); | |
114 | /* back up enough to print this name with '/' */ | |
115 | length -= cur; | |
e374a2bf | 116 | strncpy(path + length, kobject_name(parent), cur); |
1da177e4 LT |
117 | *(path + --length) = '/'; |
118 | } | |
119 | ||
9f66fa2a | 120 | pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj), |
810304db | 121 | kobj, __func__, path); |
1da177e4 LT |
122 | } |
123 | ||
124 | /** | |
72fd4a35 | 125 | * kobject_get_path - generate and return the path associated with a given kobj and kset pair. |
1da177e4 LT |
126 | * |
127 | * @kobj: kobject in question, with which to build the path | |
128 | * @gfp_mask: the allocation type used to allocate the path | |
72fd4a35 RD |
129 | * |
130 | * The result must be freed by the caller with kfree(). | |
1da177e4 | 131 | */ |
fd4f2df2 | 132 | char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask) |
1da177e4 LT |
133 | { |
134 | char *path; | |
135 | int len; | |
136 | ||
137 | len = get_kobj_path_length(kobj); | |
b365b3da CE |
138 | if (len == 0) |
139 | return NULL; | |
4668edc3 | 140 | path = kzalloc(len, gfp_mask); |
1da177e4 LT |
141 | if (!path) |
142 | return NULL; | |
1da177e4 LT |
143 | fill_kobj_path(kobj, path, len); |
144 | ||
145 | return path; | |
146 | } | |
80fc9f53 | 147 | EXPORT_SYMBOL_GPL(kobject_get_path); |
1da177e4 | 148 | |
0f4dafc0 KS |
149 | /* add the kobject to its kset's list */ |
150 | static void kobj_kset_join(struct kobject *kobj) | |
1da177e4 | 151 | { |
0f4dafc0 | 152 | if (!kobj->kset) |
31b9025a | 153 | return; |
0f4dafc0 KS |
154 | |
155 | kset_get(kobj->kset); | |
156 | spin_lock(&kobj->kset->list_lock); | |
157 | list_add_tail(&kobj->entry, &kobj->kset->list); | |
158 | spin_unlock(&kobj->kset->list_lock); | |
1da177e4 LT |
159 | } |
160 | ||
0f4dafc0 KS |
161 | /* remove the kobject from its kset's list */ |
162 | static void kobj_kset_leave(struct kobject *kobj) | |
163 | { | |
164 | if (!kobj->kset) | |
165 | return; | |
1da177e4 | 166 | |
0f4dafc0 KS |
167 | spin_lock(&kobj->kset->list_lock); |
168 | list_del_init(&kobj->entry); | |
169 | spin_unlock(&kobj->kset->list_lock); | |
170 | kset_put(kobj->kset); | |
171 | } | |
1da177e4 | 172 | |
e374a2bf | 173 | static void kobject_init_internal(struct kobject *kobj) |
1da177e4 | 174 | { |
0f4dafc0 KS |
175 | if (!kobj) |
176 | return; | |
177 | kref_init(&kobj->kref); | |
178 | INIT_LIST_HEAD(&kobj->entry); | |
a4573c48 GKH |
179 | kobj->state_in_sysfs = 0; |
180 | kobj->state_add_uevent_sent = 0; | |
181 | kobj->state_remove_uevent_sent = 0; | |
182 | kobj->state_initialized = 1; | |
1da177e4 LT |
183 | } |
184 | ||
0f4dafc0 | 185 | |
9e7bbccd | 186 | static int kobject_add_internal(struct kobject *kobj) |
1da177e4 LT |
187 | { |
188 | int error = 0; | |
e374a2bf | 189 | struct kobject *parent; |
1da177e4 | 190 | |
0f4dafc0 | 191 | if (!kobj) |
1da177e4 | 192 | return -ENOENT; |
0f4dafc0 | 193 | |
af5ca3f4 | 194 | if (!kobj->name || !kobj->name[0]) { |
d955c78a | 195 | WARN(1, "kobject: (%p): attempted to be registered with empty " |
9f66fa2a | 196 | "name!\n", kobj); |
c171fef5 GKH |
197 | return -EINVAL; |
198 | } | |
1da177e4 | 199 | |
0f4dafc0 | 200 | parent = kobject_get(kobj->parent); |
1da177e4 | 201 | |
0f4dafc0 | 202 | /* join kset if set, use it as parent if we do not already have one */ |
1da177e4 | 203 | if (kobj->kset) { |
0f4dafc0 | 204 | if (!parent) |
1da177e4 | 205 | parent = kobject_get(&kobj->kset->kobj); |
0f4dafc0 | 206 | kobj_kset_join(kobj); |
460f7e9a | 207 | kobj->parent = parent; |
1da177e4 | 208 | } |
1da177e4 | 209 | |
0f4dafc0 | 210 | pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n", |
810304db | 211 | kobject_name(kobj), kobj, __func__, |
0f4dafc0 | 212 | parent ? kobject_name(parent) : "<NULL>", |
e374a2bf | 213 | kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>"); |
0f4dafc0 | 214 | |
90bc6135 | 215 | error = create_dir(kobj); |
1da177e4 | 216 | if (error) { |
0f4dafc0 KS |
217 | kobj_kset_leave(kobj); |
218 | kobject_put(parent); | |
219 | kobj->parent = NULL; | |
dcd0da00 GKH |
220 | |
221 | /* be noisy on error issues */ | |
222 | if (error == -EEXIST) | |
282029c0 DW |
223 | WARN(1, "%s failed for %s with " |
224 | "-EEXIST, don't try to register things with " | |
225 | "the same name in the same directory.\n", | |
226 | __func__, kobject_name(kobj)); | |
dcd0da00 | 227 | else |
282029c0 DW |
228 | WARN(1, "%s failed for %s (error: %d parent: %s)\n", |
229 | __func__, kobject_name(kobj), error, | |
230 | parent ? kobject_name(parent) : "'none'"); | |
0f4dafc0 KS |
231 | } else |
232 | kobj->state_in_sysfs = 1; | |
1da177e4 LT |
233 | |
234 | return error; | |
235 | } | |
236 | ||
663a4743 GKH |
237 | /** |
238 | * kobject_set_name_vargs - Set the name of an kobject | |
239 | * @kobj: struct kobject to set the name of | |
240 | * @fmt: format string used to build the name | |
241 | * @vargs: vargs to format the string. | |
242 | */ | |
1fa5ae85 | 243 | int kobject_set_name_vargs(struct kobject *kobj, const char *fmt, |
663a4743 GKH |
244 | va_list vargs) |
245 | { | |
9f255651 KS |
246 | const char *old_name = kobj->name; |
247 | char *s; | |
663a4743 | 248 | |
8a577ffc KS |
249 | if (kobj->name && !fmt) |
250 | return 0; | |
251 | ||
a4ca6617 KS |
252 | kobj->name = kvasprintf(GFP_KERNEL, fmt, vargs); |
253 | if (!kobj->name) | |
254 | return -ENOMEM; | |
663a4743 | 255 | |
9f255651 | 256 | /* ewww... some of these buggers have '/' in the name ... */ |
25fdeb3f | 257 | while ((s = strchr(kobj->name, '/'))) |
9f255651 KS |
258 | s[0] = '!'; |
259 | ||
260 | kfree(old_name); | |
663a4743 GKH |
261 | return 0; |
262 | } | |
1da177e4 LT |
263 | |
264 | /** | |
8c4606b1 | 265 | * kobject_set_name - Set the name of a kobject |
663a4743 | 266 | * @kobj: struct kobject to set the name of |
8c4606b1 | 267 | * @fmt: format string used to build the name |
1da177e4 | 268 | * |
8c4606b1 GKH |
269 | * This sets the name of the kobject. If you have already added the |
270 | * kobject to the system, you must call kobject_rename() in order to | |
271 | * change the name of the kobject. | |
1da177e4 | 272 | */ |
663a4743 | 273 | int kobject_set_name(struct kobject *kobj, const char *fmt, ...) |
1da177e4 | 274 | { |
a4ca6617 | 275 | va_list vargs; |
663a4743 | 276 | int retval; |
1da177e4 | 277 | |
a4ca6617 KS |
278 | va_start(vargs, fmt); |
279 | retval = kobject_set_name_vargs(kobj, fmt, vargs); | |
280 | va_end(vargs); | |
1da177e4 | 281 | |
663a4743 | 282 | return retval; |
1da177e4 | 283 | } |
1da177e4 LT |
284 | EXPORT_SYMBOL(kobject_set_name); |
285 | ||
e86000d0 | 286 | /** |
f9cb074b | 287 | * kobject_init - initialize a kobject structure |
e86000d0 GKH |
288 | * @kobj: pointer to the kobject to initialize |
289 | * @ktype: pointer to the ktype for this kobject. | |
290 | * | |
291 | * This function will properly initialize a kobject such that it can then | |
292 | * be passed to the kobject_add() call. | |
293 | * | |
294 | * After this function is called, the kobject MUST be cleaned up by a call | |
295 | * to kobject_put(), not by a call to kfree directly to ensure that all of | |
296 | * the memory is cleaned up properly. | |
297 | */ | |
f9cb074b | 298 | void kobject_init(struct kobject *kobj, struct kobj_type *ktype) |
e86000d0 GKH |
299 | { |
300 | char *err_str; | |
301 | ||
302 | if (!kobj) { | |
303 | err_str = "invalid kobject pointer!"; | |
304 | goto error; | |
305 | } | |
306 | if (!ktype) { | |
307 | err_str = "must have a ktype to be initialized properly!\n"; | |
308 | goto error; | |
309 | } | |
0f4dafc0 | 310 | if (kobj->state_initialized) { |
e86000d0 | 311 | /* do not error out as sometimes we can recover */ |
0f4dafc0 KS |
312 | printk(KERN_ERR "kobject (%p): tried to init an initialized " |
313 | "object, something is seriously wrong.\n", kobj); | |
e86000d0 GKH |
314 | dump_stack(); |
315 | } | |
316 | ||
a4573c48 | 317 | kobject_init_internal(kobj); |
e86000d0 GKH |
318 | kobj->ktype = ktype; |
319 | return; | |
320 | ||
321 | error: | |
0f4dafc0 | 322 | printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str); |
e86000d0 GKH |
323 | dump_stack(); |
324 | } | |
f9cb074b | 325 | EXPORT_SYMBOL(kobject_init); |
e86000d0 | 326 | |
244f6cee GKH |
327 | static int kobject_add_varg(struct kobject *kobj, struct kobject *parent, |
328 | const char *fmt, va_list vargs) | |
329 | { | |
244f6cee GKH |
330 | int retval; |
331 | ||
a4ca6617 | 332 | retval = kobject_set_name_vargs(kobj, fmt, vargs); |
244f6cee GKH |
333 | if (retval) { |
334 | printk(KERN_ERR "kobject: can not set name properly!\n"); | |
335 | return retval; | |
336 | } | |
337 | kobj->parent = parent; | |
9e7bbccd | 338 | return kobject_add_internal(kobj); |
244f6cee GKH |
339 | } |
340 | ||
341 | /** | |
b2d6db58 | 342 | * kobject_add - the main kobject add function |
244f6cee GKH |
343 | * @kobj: the kobject to add |
344 | * @parent: pointer to the parent of the kobject. | |
345 | * @fmt: format to name the kobject with. | |
346 | * | |
347 | * The kobject name is set and added to the kobject hierarchy in this | |
348 | * function. | |
349 | * | |
350 | * If @parent is set, then the parent of the @kobj will be set to it. | |
351 | * If @parent is NULL, then the parent of the @kobj will be set to the | |
352 | * kobject associted with the kset assigned to this kobject. If no kset | |
353 | * is assigned to the kobject, then the kobject will be located in the | |
354 | * root of the sysfs tree. | |
355 | * | |
356 | * If this function returns an error, kobject_put() must be called to | |
357 | * properly clean up the memory associated with the object. | |
244f6cee GKH |
358 | * Under no instance should the kobject that is passed to this function |
359 | * be directly freed with a call to kfree(), that can leak memory. | |
360 | * | |
0f4dafc0 | 361 | * Note, no "add" uevent will be created with this call, the caller should set |
244f6cee GKH |
362 | * up all of the necessary sysfs files for the object and then call |
363 | * kobject_uevent() with the UEVENT_ADD parameter to ensure that | |
364 | * userspace is properly notified of this kobject's creation. | |
365 | */ | |
b2d6db58 GKH |
366 | int kobject_add(struct kobject *kobj, struct kobject *parent, |
367 | const char *fmt, ...) | |
244f6cee GKH |
368 | { |
369 | va_list args; | |
370 | int retval; | |
371 | ||
372 | if (!kobj) | |
373 | return -EINVAL; | |
374 | ||
0f4dafc0 KS |
375 | if (!kobj->state_initialized) { |
376 | printk(KERN_ERR "kobject '%s' (%p): tried to add an " | |
377 | "uninitialized object, something is seriously wrong.\n", | |
378 | kobject_name(kobj), kobj); | |
379 | dump_stack(); | |
380 | return -EINVAL; | |
381 | } | |
244f6cee GKH |
382 | va_start(args, fmt); |
383 | retval = kobject_add_varg(kobj, parent, fmt, args); | |
384 | va_end(args); | |
385 | ||
386 | return retval; | |
387 | } | |
b2d6db58 | 388 | EXPORT_SYMBOL(kobject_add); |
244f6cee | 389 | |
c11c4154 GKH |
390 | /** |
391 | * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy | |
392 | * @kobj: pointer to the kobject to initialize | |
393 | * @ktype: pointer to the ktype for this kobject. | |
394 | * @parent: pointer to the parent of this kobject. | |
395 | * @fmt: the name of the kobject. | |
396 | * | |
f9cb074b | 397 | * This function combines the call to kobject_init() and |
b2d6db58 GKH |
398 | * kobject_add(). The same type of error handling after a call to |
399 | * kobject_add() and kobject lifetime rules are the same here. | |
c11c4154 GKH |
400 | */ |
401 | int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype, | |
402 | struct kobject *parent, const char *fmt, ...) | |
403 | { | |
404 | va_list args; | |
405 | int retval; | |
406 | ||
f9cb074b | 407 | kobject_init(kobj, ktype); |
c11c4154 GKH |
408 | |
409 | va_start(args, fmt); | |
410 | retval = kobject_add_varg(kobj, parent, fmt, args); | |
411 | va_end(args); | |
412 | ||
413 | return retval; | |
414 | } | |
415 | EXPORT_SYMBOL_GPL(kobject_init_and_add); | |
416 | ||
1da177e4 | 417 | /** |
e374a2bf GKH |
418 | * kobject_rename - change the name of an object |
419 | * @kobj: object in question. | |
420 | * @new_name: object's new name | |
030c1d2b EB |
421 | * |
422 | * It is the responsibility of the caller to provide mutual | |
423 | * exclusion between two different calls of kobject_rename | |
424 | * on the same kobject and to ensure that new_name is valid and | |
425 | * won't conflict with other kobjects. | |
1da177e4 | 426 | */ |
e374a2bf | 427 | int kobject_rename(struct kobject *kobj, const char *new_name) |
1da177e4 LT |
428 | { |
429 | int error = 0; | |
ca2f37db | 430 | const char *devpath = NULL; |
0b4a4fea | 431 | const char *dup_name = NULL, *name; |
ca2f37db JT |
432 | char *devpath_string = NULL; |
433 | char *envp[2]; | |
1da177e4 LT |
434 | |
435 | kobj = kobject_get(kobj); | |
436 | if (!kobj) | |
437 | return -EINVAL; | |
b592fcfe EB |
438 | if (!kobj->parent) |
439 | return -EINVAL; | |
ca2f37db JT |
440 | |
441 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
442 | if (!devpath) { | |
443 | error = -ENOMEM; | |
444 | goto out; | |
445 | } | |
446 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
447 | if (!devpath_string) { | |
448 | error = -ENOMEM; | |
449 | goto out; | |
450 | } | |
451 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
452 | envp[0] = devpath_string; | |
453 | envp[1] = NULL; | |
ca2f37db | 454 | |
0b4a4fea EB |
455 | name = dup_name = kstrdup(new_name, GFP_KERNEL); |
456 | if (!name) { | |
457 | error = -ENOMEM; | |
458 | goto out; | |
459 | } | |
460 | ||
e34ff490 | 461 | error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj)); |
0b4a4fea EB |
462 | if (error) |
463 | goto out; | |
464 | ||
465 | /* Install the new kobject name */ | |
466 | dup_name = kobj->name; | |
467 | kobj->name = name; | |
ca2f37db JT |
468 | |
469 | /* This function is mostly/only used for network interface. | |
470 | * Some hotplug package track interfaces by their name and | |
471 | * therefore want to know when the name is changed by the user. */ | |
0b4a4fea | 472 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); |
ca2f37db JT |
473 | |
474 | out: | |
0b4a4fea | 475 | kfree(dup_name); |
ca2f37db JT |
476 | kfree(devpath_string); |
477 | kfree(devpath); | |
b592fcfe EB |
478 | kobject_put(kobj); |
479 | ||
480 | return error; | |
481 | } | |
8344b568 | 482 | EXPORT_SYMBOL_GPL(kobject_rename); |
b592fcfe | 483 | |
8a82472f | 484 | /** |
e374a2bf GKH |
485 | * kobject_move - move object to another parent |
486 | * @kobj: object in question. | |
487 | * @new_parent: object's new parent (can be NULL) | |
8a82472f | 488 | */ |
8a82472f CH |
489 | int kobject_move(struct kobject *kobj, struct kobject *new_parent) |
490 | { | |
491 | int error; | |
492 | struct kobject *old_parent; | |
493 | const char *devpath = NULL; | |
494 | char *devpath_string = NULL; | |
495 | char *envp[2]; | |
496 | ||
497 | kobj = kobject_get(kobj); | |
498 | if (!kobj) | |
499 | return -EINVAL; | |
500 | new_parent = kobject_get(new_parent); | |
501 | if (!new_parent) { | |
c744aeae CH |
502 | if (kobj->kset) |
503 | new_parent = kobject_get(&kobj->kset->kobj); | |
8a82472f | 504 | } |
e34ff490 | 505 | |
8a82472f CH |
506 | /* old object path */ |
507 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
508 | if (!devpath) { | |
509 | error = -ENOMEM; | |
510 | goto out; | |
511 | } | |
512 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
513 | if (!devpath_string) { | |
514 | error = -ENOMEM; | |
515 | goto out; | |
516 | } | |
517 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
518 | envp[0] = devpath_string; | |
519 | envp[1] = NULL; | |
e34ff490 | 520 | error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj)); |
8a82472f CH |
521 | if (error) |
522 | goto out; | |
523 | old_parent = kobj->parent; | |
524 | kobj->parent = new_parent; | |
9e993efb | 525 | new_parent = NULL; |
8a82472f CH |
526 | kobject_put(old_parent); |
527 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); | |
528 | out: | |
9e993efb | 529 | kobject_put(new_parent); |
8a82472f CH |
530 | kobject_put(kobj); |
531 | kfree(devpath_string); | |
532 | kfree(devpath); | |
533 | return error; | |
534 | } | |
535 | ||
1da177e4 | 536 | /** |
e374a2bf GKH |
537 | * kobject_del - unlink kobject from hierarchy. |
538 | * @kobj: object. | |
1da177e4 | 539 | */ |
e374a2bf | 540 | void kobject_del(struct kobject *kobj) |
1da177e4 | 541 | { |
26ea12de TH |
542 | struct sysfs_dirent *sd; |
543 | ||
31b9025a GKH |
544 | if (!kobj) |
545 | return; | |
0f4dafc0 | 546 | |
26ea12de | 547 | sd = kobj->sd; |
1da177e4 | 548 | sysfs_remove_dir(kobj); |
26ea12de TH |
549 | sysfs_put(sd); |
550 | ||
0f4dafc0 KS |
551 | kobj->state_in_sysfs = 0; |
552 | kobj_kset_leave(kobj); | |
553 | kobject_put(kobj->parent); | |
554 | kobj->parent = NULL; | |
1da177e4 LT |
555 | } |
556 | ||
1da177e4 | 557 | /** |
e374a2bf GKH |
558 | * kobject_get - increment refcount for object. |
559 | * @kobj: object. | |
1da177e4 | 560 | */ |
e374a2bf | 561 | struct kobject *kobject_get(struct kobject *kobj) |
1da177e4 LT |
562 | { |
563 | if (kobj) | |
564 | kref_get(&kobj->kref); | |
565 | return kobj; | |
566 | } | |
567 | ||
2d864e41 | 568 | static struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj) |
a49b7e82 LT |
569 | { |
570 | if (!kref_get_unless_zero(&kobj->kref)) | |
571 | kobj = NULL; | |
572 | return kobj; | |
573 | } | |
574 | ||
18041f47 GKH |
575 | /* |
576 | * kobject_cleanup - free kobject resources. | |
577 | * @kobj: object to cleanup | |
1da177e4 | 578 | */ |
18041f47 | 579 | static void kobject_cleanup(struct kobject *kobj) |
1da177e4 | 580 | { |
0f4dafc0 | 581 | struct kobj_type *t = get_ktype(kobj); |
af5ca3f4 | 582 | const char *name = kobj->name; |
1da177e4 | 583 | |
c817a67e RK |
584 | pr_debug("kobject: '%s' (%p): %s, parent %p\n", |
585 | kobject_name(kobj), kobj, __func__, kobj->parent); | |
0f4dafc0 KS |
586 | |
587 | if (t && !t->release) | |
588 | pr_debug("kobject: '%s' (%p): does not have a release() " | |
589 | "function, it is broken and must be fixed.\n", | |
590 | kobject_name(kobj), kobj); | |
591 | ||
592 | /* send "remove" if the caller did not do it but sent "add" */ | |
593 | if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) { | |
594 | pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n", | |
595 | kobject_name(kobj), kobj); | |
596 | kobject_uevent(kobj, KOBJ_REMOVE); | |
597 | } | |
598 | ||
599 | /* remove from sysfs if the caller did not do it */ | |
600 | if (kobj->state_in_sysfs) { | |
601 | pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n", | |
602 | kobject_name(kobj), kobj); | |
603 | kobject_del(kobj); | |
604 | } | |
605 | ||
ce2c9cb0 | 606 | if (t && t->release) { |
0f4dafc0 KS |
607 | pr_debug("kobject: '%s' (%p): calling ktype release\n", |
608 | kobject_name(kobj), kobj); | |
1da177e4 | 609 | t->release(kobj); |
0f4dafc0 KS |
610 | } |
611 | ||
612 | /* free name if we allocated it */ | |
af5ca3f4 | 613 | if (name) { |
0f4dafc0 | 614 | pr_debug("kobject: '%s': free name\n", name); |
ce2c9cb0 GKH |
615 | kfree(name); |
616 | } | |
1da177e4 LT |
617 | } |
618 | ||
c817a67e RK |
619 | #ifdef CONFIG_DEBUG_KOBJECT_RELEASE |
620 | static void kobject_delayed_cleanup(struct work_struct *work) | |
621 | { | |
622 | kobject_cleanup(container_of(to_delayed_work(work), | |
623 | struct kobject, release)); | |
624 | } | |
625 | #endif | |
626 | ||
1da177e4 LT |
627 | static void kobject_release(struct kref *kref) |
628 | { | |
c817a67e RK |
629 | struct kobject *kobj = container_of(kref, struct kobject, kref); |
630 | #ifdef CONFIG_DEBUG_KOBJECT_RELEASE | |
1461c5be | 631 | pr_info("kobject: '%s' (%p): %s, parent %p (delayed)\n", |
c817a67e RK |
632 | kobject_name(kobj), kobj, __func__, kobj->parent); |
633 | INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup); | |
634 | schedule_delayed_work(&kobj->release, HZ); | |
635 | #else | |
636 | kobject_cleanup(kobj); | |
637 | #endif | |
1da177e4 LT |
638 | } |
639 | ||
640 | /** | |
e374a2bf GKH |
641 | * kobject_put - decrement refcount for object. |
642 | * @kobj: object. | |
1da177e4 | 643 | * |
e374a2bf | 644 | * Decrement the refcount, and if 0, call kobject_cleanup(). |
1da177e4 | 645 | */ |
e374a2bf | 646 | void kobject_put(struct kobject *kobj) |
1da177e4 | 647 | { |
c1ebdae5 | 648 | if (kobj) { |
d955c78a AV |
649 | if (!kobj->state_initialized) |
650 | WARN(1, KERN_WARNING "kobject: '%s' (%p): is not " | |
c1ebdae5 GKH |
651 | "initialized, yet kobject_put() is being " |
652 | "called.\n", kobject_name(kobj), kobj); | |
1da177e4 | 653 | kref_put(&kobj->kref, kobject_release); |
c1ebdae5 | 654 | } |
1da177e4 LT |
655 | } |
656 | ||
3f9e3ee9 | 657 | static void dynamic_kobj_release(struct kobject *kobj) |
7423172a | 658 | { |
810304db | 659 | pr_debug("kobject: (%p): %s\n", kobj, __func__); |
7423172a JN |
660 | kfree(kobj); |
661 | } | |
662 | ||
3f9e3ee9 | 663 | static struct kobj_type dynamic_kobj_ktype = { |
386f275f KS |
664 | .release = dynamic_kobj_release, |
665 | .sysfs_ops = &kobj_sysfs_ops, | |
7423172a JN |
666 | }; |
667 | ||
43968d2f | 668 | /** |
3f9e3ee9 GKH |
669 | * kobject_create - create a struct kobject dynamically |
670 | * | |
671 | * This function creates a kobject structure dynamically and sets it up | |
672 | * to be a "dynamic" kobject with a default release function set up. | |
673 | * | |
674 | * If the kobject was not able to be created, NULL will be returned. | |
43968d2f | 675 | * The kobject structure returned from here must be cleaned up with a |
f9cb074b | 676 | * call to kobject_put() and not kfree(), as kobject_init() has |
43968d2f | 677 | * already been called on this structure. |
3f9e3ee9 | 678 | */ |
43968d2f | 679 | struct kobject *kobject_create(void) |
3f9e3ee9 GKH |
680 | { |
681 | struct kobject *kobj; | |
682 | ||
683 | kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); | |
684 | if (!kobj) | |
685 | return NULL; | |
686 | ||
f9cb074b | 687 | kobject_init(kobj, &dynamic_kobj_ktype); |
3f9e3ee9 GKH |
688 | return kobj; |
689 | } | |
690 | ||
691 | /** | |
692 | * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs | |
693 | * | |
9ff1f838 | 694 | * @name: the name for the kobject |
3f9e3ee9 GKH |
695 | * @parent: the parent kobject of this kobject, if any. |
696 | * | |
f70701a3 | 697 | * This function creates a kobject structure dynamically and registers it |
3f9e3ee9 | 698 | * with sysfs. When you are finished with this structure, call |
78a2d906 | 699 | * kobject_put() and the structure will be dynamically freed when |
3f9e3ee9 GKH |
700 | * it is no longer being used. |
701 | * | |
702 | * If the kobject was not able to be created, NULL will be returned. | |
703 | */ | |
704 | struct kobject *kobject_create_and_add(const char *name, struct kobject *parent) | |
705 | { | |
706 | struct kobject *kobj; | |
707 | int retval; | |
708 | ||
709 | kobj = kobject_create(); | |
710 | if (!kobj) | |
711 | return NULL; | |
712 | ||
b2d6db58 | 713 | retval = kobject_add(kobj, parent, "%s", name); |
3f9e3ee9 GKH |
714 | if (retval) { |
715 | printk(KERN_WARNING "%s: kobject_add error: %d\n", | |
810304db | 716 | __func__, retval); |
3f9e3ee9 GKH |
717 | kobject_put(kobj); |
718 | kobj = NULL; | |
719 | } | |
720 | return kobj; | |
721 | } | |
722 | EXPORT_SYMBOL_GPL(kobject_create_and_add); | |
723 | ||
1da177e4 | 724 | /** |
e374a2bf GKH |
725 | * kset_init - initialize a kset for use |
726 | * @k: kset | |
1da177e4 | 727 | */ |
e374a2bf | 728 | void kset_init(struct kset *k) |
1da177e4 | 729 | { |
e1543ddf | 730 | kobject_init_internal(&k->kobj); |
1da177e4 LT |
731 | INIT_LIST_HEAD(&k->list); |
732 | spin_lock_init(&k->list_lock); | |
733 | } | |
734 | ||
23b5212c KS |
735 | /* default kobject attribute operations */ |
736 | static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr, | |
737 | char *buf) | |
738 | { | |
739 | struct kobj_attribute *kattr; | |
740 | ssize_t ret = -EIO; | |
741 | ||
742 | kattr = container_of(attr, struct kobj_attribute, attr); | |
743 | if (kattr->show) | |
744 | ret = kattr->show(kobj, kattr, buf); | |
745 | return ret; | |
746 | } | |
747 | ||
748 | static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr, | |
749 | const char *buf, size_t count) | |
750 | { | |
751 | struct kobj_attribute *kattr; | |
752 | ssize_t ret = -EIO; | |
753 | ||
754 | kattr = container_of(attr, struct kobj_attribute, attr); | |
755 | if (kattr->store) | |
756 | ret = kattr->store(kobj, kattr, buf, count); | |
757 | return ret; | |
758 | } | |
759 | ||
52cf25d0 | 760 | const struct sysfs_ops kobj_sysfs_ops = { |
23b5212c KS |
761 | .show = kobj_attr_show, |
762 | .store = kobj_attr_store, | |
763 | }; | |
1da177e4 | 764 | |
eee03164 JM |
765 | /** |
766 | * kobj_completion_init - initialize a kobj_completion object. | |
767 | * @kc: kobj_completion | |
768 | * @ktype: type of kobject to initialize | |
769 | * | |
770 | * kobj_completion structures can be embedded within structures with different | |
771 | * lifetime rules. During the release of the enclosing object, we can | |
772 | * wait on the release of the kobject so that we don't free it while it's | |
773 | * still busy. | |
774 | */ | |
775 | void kobj_completion_init(struct kobj_completion *kc, struct kobj_type *ktype) | |
776 | { | |
777 | init_completion(&kc->kc_unregister); | |
778 | kobject_init(&kc->kc_kobj, ktype); | |
779 | } | |
780 | EXPORT_SYMBOL_GPL(kobj_completion_init); | |
781 | ||
782 | /** | |
783 | * kobj_completion_release - release a kobj_completion object | |
784 | * @kobj: kobject embedded in kobj_completion | |
785 | * | |
786 | * Used with kobject_release to notify waiters that the kobject has been | |
787 | * released. | |
788 | */ | |
789 | void kobj_completion_release(struct kobject *kobj) | |
790 | { | |
791 | struct kobj_completion *kc = kobj_to_kobj_completion(kobj); | |
792 | complete(&kc->kc_unregister); | |
793 | } | |
794 | EXPORT_SYMBOL_GPL(kobj_completion_release); | |
795 | ||
796 | /** | |
797 | * kobj_completion_del_and_wait - release the kobject and wait for it | |
798 | * @kc: kobj_completion object to release | |
799 | * | |
800 | * Delete the kobject from sysfs and drop the reference count. Then wait | |
801 | * until any other outstanding references are also dropped. This routine | |
802 | * is only necessary once other references may have been taken on the | |
803 | * kobject. Typically this happens when the kobject has been published | |
804 | * to sysfs via kobject_add. | |
805 | */ | |
806 | void kobj_completion_del_and_wait(struct kobj_completion *kc) | |
807 | { | |
808 | kobject_del(&kc->kc_kobj); | |
809 | kobject_put(&kc->kc_kobj); | |
810 | wait_for_completion(&kc->kc_unregister); | |
811 | } | |
812 | EXPORT_SYMBOL_GPL(kobj_completion_del_and_wait); | |
813 | ||
1da177e4 | 814 | /** |
e374a2bf GKH |
815 | * kset_register - initialize and add a kset. |
816 | * @k: kset. | |
1da177e4 | 817 | */ |
e374a2bf | 818 | int kset_register(struct kset *k) |
1da177e4 | 819 | { |
80f03e34 KS |
820 | int err; |
821 | ||
31b9025a GKH |
822 | if (!k) |
823 | return -EINVAL; | |
80f03e34 | 824 | |
1da177e4 | 825 | kset_init(k); |
12e339ac | 826 | err = kobject_add_internal(&k->kobj); |
80f03e34 KS |
827 | if (err) |
828 | return err; | |
829 | kobject_uevent(&k->kobj, KOBJ_ADD); | |
830 | return 0; | |
1da177e4 LT |
831 | } |
832 | ||
1da177e4 | 833 | /** |
e374a2bf GKH |
834 | * kset_unregister - remove a kset. |
835 | * @k: kset. | |
1da177e4 | 836 | */ |
e374a2bf | 837 | void kset_unregister(struct kset *k) |
1da177e4 | 838 | { |
31b9025a GKH |
839 | if (!k) |
840 | return; | |
78a2d906 | 841 | kobject_put(&k->kobj); |
1da177e4 LT |
842 | } |
843 | ||
1da177e4 | 844 | /** |
e374a2bf GKH |
845 | * kset_find_obj - search for object in kset. |
846 | * @kset: kset we're looking in. | |
847 | * @name: object's name. | |
1da177e4 | 848 | * |
e374a2bf GKH |
849 | * Lock kset via @kset->subsys, and iterate over @kset->list, |
850 | * looking for a matching kobject. If matching object is found | |
851 | * take a reference and return the object. | |
1da177e4 | 852 | */ |
e374a2bf | 853 | struct kobject *kset_find_obj(struct kset *kset, const char *name) |
1da177e4 | 854 | { |
c6a2a3dc | 855 | struct kobject *k; |
e374a2bf | 856 | struct kobject *ret = NULL; |
1da177e4 LT |
857 | |
858 | spin_lock(&kset->list_lock); | |
c25d1dfb | 859 | |
c6a2a3dc | 860 | list_for_each_entry(k, &kset->list, entry) { |
e374a2bf | 861 | if (kobject_name(k) && !strcmp(kobject_name(k), name)) { |
a49b7e82 | 862 | ret = kobject_get_unless_zero(k); |
1da177e4 LT |
863 | break; |
864 | } | |
865 | } | |
c25d1dfb | 866 | |
1da177e4 LT |
867 | spin_unlock(&kset->list_lock); |
868 | return ret; | |
869 | } | |
870 | ||
b727c702 GKH |
871 | static void kset_release(struct kobject *kobj) |
872 | { | |
873 | struct kset *kset = container_of(kobj, struct kset, kobj); | |
9f66fa2a | 874 | pr_debug("kobject: '%s' (%p): %s\n", |
810304db | 875 | kobject_name(kobj), kobj, __func__); |
b727c702 GKH |
876 | kfree(kset); |
877 | } | |
878 | ||
386f275f KS |
879 | static struct kobj_type kset_ktype = { |
880 | .sysfs_ops = &kobj_sysfs_ops, | |
b727c702 GKH |
881 | .release = kset_release, |
882 | }; | |
883 | ||
884 | /** | |
885 | * kset_create - create a struct kset dynamically | |
886 | * | |
887 | * @name: the name for the kset | |
888 | * @uevent_ops: a struct kset_uevent_ops for the kset | |
889 | * @parent_kobj: the parent kobject of this kset, if any. | |
890 | * | |
891 | * This function creates a kset structure dynamically. This structure can | |
892 | * then be registered with the system and show up in sysfs with a call to | |
893 | * kset_register(). When you are finished with this structure, if | |
894 | * kset_register() has been called, call kset_unregister() and the | |
895 | * structure will be dynamically freed when it is no longer being used. | |
896 | * | |
897 | * If the kset was not able to be created, NULL will be returned. | |
898 | */ | |
899 | static struct kset *kset_create(const char *name, | |
9cd43611 | 900 | const struct kset_uevent_ops *uevent_ops, |
b727c702 GKH |
901 | struct kobject *parent_kobj) |
902 | { | |
903 | struct kset *kset; | |
d9cd8f37 | 904 | int retval; |
b727c702 GKH |
905 | |
906 | kset = kzalloc(sizeof(*kset), GFP_KERNEL); | |
907 | if (!kset) | |
908 | return NULL; | |
b7165ebb | 909 | retval = kobject_set_name(&kset->kobj, "%s", name); |
d9cd8f37 DY |
910 | if (retval) { |
911 | kfree(kset); | |
912 | return NULL; | |
913 | } | |
b727c702 GKH |
914 | kset->uevent_ops = uevent_ops; |
915 | kset->kobj.parent = parent_kobj; | |
916 | ||
917 | /* | |
386f275f | 918 | * The kobject of this kset will have a type of kset_ktype and belong to |
b727c702 GKH |
919 | * no kset itself. That way we can properly free it when it is |
920 | * finished being used. | |
921 | */ | |
386f275f | 922 | kset->kobj.ktype = &kset_ktype; |
b727c702 GKH |
923 | kset->kobj.kset = NULL; |
924 | ||
925 | return kset; | |
926 | } | |
927 | ||
928 | /** | |
929 | * kset_create_and_add - create a struct kset dynamically and add it to sysfs | |
930 | * | |
931 | * @name: the name for the kset | |
932 | * @uevent_ops: a struct kset_uevent_ops for the kset | |
933 | * @parent_kobj: the parent kobject of this kset, if any. | |
934 | * | |
935 | * This function creates a kset structure dynamically and registers it | |
936 | * with sysfs. When you are finished with this structure, call | |
937 | * kset_unregister() and the structure will be dynamically freed when it | |
938 | * is no longer being used. | |
939 | * | |
940 | * If the kset was not able to be created, NULL will be returned. | |
941 | */ | |
942 | struct kset *kset_create_and_add(const char *name, | |
9cd43611 | 943 | const struct kset_uevent_ops *uevent_ops, |
b727c702 GKH |
944 | struct kobject *parent_kobj) |
945 | { | |
946 | struct kset *kset; | |
947 | int error; | |
948 | ||
949 | kset = kset_create(name, uevent_ops, parent_kobj); | |
950 | if (!kset) | |
951 | return NULL; | |
952 | error = kset_register(kset); | |
953 | if (error) { | |
954 | kfree(kset); | |
955 | return NULL; | |
956 | } | |
957 | return kset; | |
958 | } | |
959 | EXPORT_SYMBOL_GPL(kset_create_and_add); | |
960 | ||
bc451f20 EB |
961 | |
962 | static DEFINE_SPINLOCK(kobj_ns_type_lock); | |
963 | static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES]; | |
964 | ||
965 | int kobj_ns_type_register(const struct kobj_ns_type_operations *ops) | |
966 | { | |
967 | enum kobj_ns_type type = ops->type; | |
968 | int error; | |
969 | ||
970 | spin_lock(&kobj_ns_type_lock); | |
971 | ||
972 | error = -EINVAL; | |
973 | if (type >= KOBJ_NS_TYPES) | |
974 | goto out; | |
975 | ||
976 | error = -EINVAL; | |
977 | if (type <= KOBJ_NS_TYPE_NONE) | |
978 | goto out; | |
979 | ||
980 | error = -EBUSY; | |
981 | if (kobj_ns_ops_tbl[type]) | |
982 | goto out; | |
983 | ||
984 | error = 0; | |
985 | kobj_ns_ops_tbl[type] = ops; | |
986 | ||
987 | out: | |
988 | spin_unlock(&kobj_ns_type_lock); | |
989 | return error; | |
990 | } | |
991 | ||
992 | int kobj_ns_type_registered(enum kobj_ns_type type) | |
993 | { | |
994 | int registered = 0; | |
995 | ||
996 | spin_lock(&kobj_ns_type_lock); | |
997 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES)) | |
998 | registered = kobj_ns_ops_tbl[type] != NULL; | |
999 | spin_unlock(&kobj_ns_type_lock); | |
1000 | ||
1001 | return registered; | |
1002 | } | |
1003 | ||
1004 | const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent) | |
1005 | { | |
1006 | const struct kobj_ns_type_operations *ops = NULL; | |
1007 | ||
1008 | if (parent && parent->ktype->child_ns_type) | |
1009 | ops = parent->ktype->child_ns_type(parent); | |
1010 | ||
1011 | return ops; | |
1012 | } | |
1013 | ||
1014 | const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj) | |
1015 | { | |
1016 | return kobj_child_ns_ops(kobj->parent); | |
1017 | } | |
1018 | ||
7dc5dbc8 EB |
1019 | bool kobj_ns_current_may_mount(enum kobj_ns_type type) |
1020 | { | |
730d7d33 | 1021 | bool may_mount = true; |
7dc5dbc8 EB |
1022 | |
1023 | spin_lock(&kobj_ns_type_lock); | |
1024 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1025 | kobj_ns_ops_tbl[type]) | |
1026 | may_mount = kobj_ns_ops_tbl[type]->current_may_mount(); | |
1027 | spin_unlock(&kobj_ns_type_lock); | |
1028 | ||
1029 | return may_mount; | |
1030 | } | |
bc451f20 | 1031 | |
a685e089 | 1032 | void *kobj_ns_grab_current(enum kobj_ns_type type) |
bc451f20 | 1033 | { |
a685e089 | 1034 | void *ns = NULL; |
bc451f20 EB |
1035 | |
1036 | spin_lock(&kobj_ns_type_lock); | |
1037 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1038 | kobj_ns_ops_tbl[type]) | |
a685e089 | 1039 | ns = kobj_ns_ops_tbl[type]->grab_current_ns(); |
bc451f20 EB |
1040 | spin_unlock(&kobj_ns_type_lock); |
1041 | ||
1042 | return ns; | |
1043 | } | |
1044 | ||
1045 | const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk) | |
1046 | { | |
1047 | const void *ns = NULL; | |
1048 | ||
1049 | spin_lock(&kobj_ns_type_lock); | |
1050 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1051 | kobj_ns_ops_tbl[type]) | |
1052 | ns = kobj_ns_ops_tbl[type]->netlink_ns(sk); | |
1053 | spin_unlock(&kobj_ns_type_lock); | |
1054 | ||
1055 | return ns; | |
1056 | } | |
1057 | ||
1058 | const void *kobj_ns_initial(enum kobj_ns_type type) | |
1059 | { | |
1060 | const void *ns = NULL; | |
1061 | ||
1062 | spin_lock(&kobj_ns_type_lock); | |
1063 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1064 | kobj_ns_ops_tbl[type]) | |
1065 | ns = kobj_ns_ops_tbl[type]->initial_ns(); | |
1066 | spin_unlock(&kobj_ns_type_lock); | |
1067 | ||
1068 | return ns; | |
1069 | } | |
1070 | ||
a685e089 | 1071 | void kobj_ns_drop(enum kobj_ns_type type, void *ns) |
bc451f20 | 1072 | { |
a685e089 AV |
1073 | spin_lock(&kobj_ns_type_lock); |
1074 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1075 | kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns) | |
1076 | kobj_ns_ops_tbl[type]->drop_ns(ns); | |
1077 | spin_unlock(&kobj_ns_type_lock); | |
bc451f20 EB |
1078 | } |
1079 | ||
1da177e4 LT |
1080 | EXPORT_SYMBOL(kobject_get); |
1081 | EXPORT_SYMBOL(kobject_put); | |
1da177e4 LT |
1082 | EXPORT_SYMBOL(kobject_del); |
1083 | ||
1084 | EXPORT_SYMBOL(kset_register); | |
1085 | EXPORT_SYMBOL(kset_unregister); |