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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> | |
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 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); | |
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 | ||
e374a2bf GKH |
40 | /* |
41 | * populate_dir - populate directory with attributes. | |
42 | * @kobj: object we're working on. | |
1da177e4 | 43 | * |
e374a2bf GKH |
44 | * Most subsystems have a set of default attributes that are associated |
45 | * with an object that registers with them. This is a helper called during | |
46 | * object registration that loops through the default attributes of the | |
47 | * subsystem and creates attributes files for them in sysfs. | |
1da177e4 | 48 | */ |
e374a2bf | 49 | static int populate_dir(struct kobject *kobj) |
1da177e4 | 50 | { |
e374a2bf GKH |
51 | struct kobj_type *t = get_ktype(kobj); |
52 | struct attribute *attr; | |
1da177e4 LT |
53 | int error = 0; |
54 | int i; | |
e374a2bf | 55 | |
1da177e4 LT |
56 | if (t && t->default_attrs) { |
57 | for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) { | |
e374a2bf GKH |
58 | error = sysfs_create_file(kobj, attr); |
59 | if (error) | |
1da177e4 LT |
60 | break; |
61 | } | |
62 | } | |
63 | return error; | |
64 | } | |
65 | ||
e374a2bf | 66 | static int create_dir(struct kobject *kobj) |
1da177e4 | 67 | { |
c84a3b27 | 68 | const struct kobj_ns_type_operations *ops; |
e34ff490 TH |
69 | int error; |
70 | ||
71 | error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj)); | |
c84a3b27 TH |
72 | if (error) |
73 | return error; | |
74 | ||
75 | error = populate_dir(kobj); | |
76 | if (error) { | |
77 | sysfs_remove_dir(kobj); | |
78 | return error; | |
1da177e4 | 79 | } |
26ea12de TH |
80 | |
81 | /* | |
82 | * @kobj->sd may be deleted by an ancestor going away. Hold an | |
83 | * extra reference so that it stays until @kobj is gone. | |
84 | */ | |
85 | sysfs_get(kobj->sd); | |
86 | ||
c84a3b27 TH |
87 | /* |
88 | * If @kobj has ns_ops, its children need to be filtered based on | |
89 | * their namespace tags. Enable namespace support on @kobj->sd. | |
90 | */ | |
91 | ops = kobj_child_ns_ops(kobj); | |
92 | if (ops) { | |
93 | BUG_ON(ops->type <= KOBJ_NS_TYPE_NONE); | |
94 | BUG_ON(ops->type >= KOBJ_NS_TYPES); | |
95 | BUG_ON(!kobj_ns_type_registered(ops->type)); | |
96 | ||
fa4cd451 | 97 | sysfs_enable_ns(kobj->sd); |
c84a3b27 TH |
98 | } |
99 | ||
100 | return 0; | |
1da177e4 LT |
101 | } |
102 | ||
1da177e4 LT |
103 | static int get_kobj_path_length(struct kobject *kobj) |
104 | { | |
105 | int length = 1; | |
e374a2bf | 106 | struct kobject *parent = kobj; |
1da177e4 | 107 | |
e374a2bf | 108 | /* walk up the ancestors until we hit the one pointing to the |
1da177e4 LT |
109 | * root. |
110 | * Add 1 to strlen for leading '/' of each level. | |
111 | */ | |
112 | do { | |
b365b3da CE |
113 | if (kobject_name(parent) == NULL) |
114 | return 0; | |
1da177e4 LT |
115 | length += strlen(kobject_name(parent)) + 1; |
116 | parent = parent->parent; | |
117 | } while (parent); | |
118 | return length; | |
119 | } | |
120 | ||
121 | static void fill_kobj_path(struct kobject *kobj, char *path, int length) | |
122 | { | |
e374a2bf | 123 | struct kobject *parent; |
1da177e4 LT |
124 | |
125 | --length; | |
126 | for (parent = kobj; parent; parent = parent->parent) { | |
127 | int cur = strlen(kobject_name(parent)); | |
128 | /* back up enough to print this name with '/' */ | |
129 | length -= cur; | |
e374a2bf | 130 | strncpy(path + length, kobject_name(parent), cur); |
1da177e4 LT |
131 | *(path + --length) = '/'; |
132 | } | |
133 | ||
9f66fa2a | 134 | pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj), |
810304db | 135 | kobj, __func__, path); |
1da177e4 LT |
136 | } |
137 | ||
138 | /** | |
72fd4a35 | 139 | * kobject_get_path - generate and return the path associated with a given kobj and kset pair. |
1da177e4 LT |
140 | * |
141 | * @kobj: kobject in question, with which to build the path | |
142 | * @gfp_mask: the allocation type used to allocate the path | |
72fd4a35 RD |
143 | * |
144 | * The result must be freed by the caller with kfree(). | |
1da177e4 | 145 | */ |
fd4f2df2 | 146 | char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask) |
1da177e4 LT |
147 | { |
148 | char *path; | |
149 | int len; | |
150 | ||
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; | |
1da177e4 LT |
157 | fill_kobj_path(kobj, path, len); |
158 | ||
159 | return path; | |
160 | } | |
80fc9f53 | 161 | EXPORT_SYMBOL_GPL(kobject_get_path); |
1da177e4 | 162 | |
0f4dafc0 KS |
163 | /* add the kobject to its kset's list */ |
164 | static void kobj_kset_join(struct kobject *kobj) | |
1da177e4 | 165 | { |
0f4dafc0 | 166 | if (!kobj->kset) |
31b9025a | 167 | return; |
0f4dafc0 KS |
168 | |
169 | kset_get(kobj->kset); | |
170 | spin_lock(&kobj->kset->list_lock); | |
171 | list_add_tail(&kobj->entry, &kobj->kset->list); | |
172 | spin_unlock(&kobj->kset->list_lock); | |
1da177e4 LT |
173 | } |
174 | ||
0f4dafc0 KS |
175 | /* remove the kobject from its kset's list */ |
176 | static void kobj_kset_leave(struct kobject *kobj) | |
177 | { | |
178 | if (!kobj->kset) | |
179 | return; | |
1da177e4 | 180 | |
0f4dafc0 KS |
181 | spin_lock(&kobj->kset->list_lock); |
182 | list_del_init(&kobj->entry); | |
183 | spin_unlock(&kobj->kset->list_lock); | |
184 | kset_put(kobj->kset); | |
185 | } | |
1da177e4 | 186 | |
e374a2bf | 187 | static void kobject_init_internal(struct kobject *kobj) |
1da177e4 | 188 | { |
0f4dafc0 KS |
189 | if (!kobj) |
190 | return; | |
191 | kref_init(&kobj->kref); | |
192 | INIT_LIST_HEAD(&kobj->entry); | |
a4573c48 GKH |
193 | kobj->state_in_sysfs = 0; |
194 | kobj->state_add_uevent_sent = 0; | |
195 | kobj->state_remove_uevent_sent = 0; | |
196 | kobj->state_initialized = 1; | |
1da177e4 LT |
197 | } |
198 | ||
0f4dafc0 | 199 | |
9e7bbccd | 200 | static int kobject_add_internal(struct kobject *kobj) |
1da177e4 LT |
201 | { |
202 | int error = 0; | |
e374a2bf | 203 | struct kobject *parent; |
1da177e4 | 204 | |
0f4dafc0 | 205 | if (!kobj) |
1da177e4 | 206 | return -ENOENT; |
0f4dafc0 | 207 | |
af5ca3f4 | 208 | if (!kobj->name || !kobj->name[0]) { |
d955c78a | 209 | WARN(1, "kobject: (%p): attempted to be registered with empty " |
9f66fa2a | 210 | "name!\n", kobj); |
c171fef5 GKH |
211 | return -EINVAL; |
212 | } | |
1da177e4 | 213 | |
0f4dafc0 | 214 | parent = kobject_get(kobj->parent); |
1da177e4 | 215 | |
0f4dafc0 | 216 | /* join kset if set, use it as parent if we do not already have one */ |
1da177e4 | 217 | if (kobj->kset) { |
0f4dafc0 | 218 | if (!parent) |
1da177e4 | 219 | parent = kobject_get(&kobj->kset->kobj); |
0f4dafc0 | 220 | kobj_kset_join(kobj); |
460f7e9a | 221 | kobj->parent = parent; |
1da177e4 | 222 | } |
1da177e4 | 223 | |
0f4dafc0 | 224 | pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n", |
810304db | 225 | kobject_name(kobj), kobj, __func__, |
0f4dafc0 | 226 | parent ? kobject_name(parent) : "<NULL>", |
e374a2bf | 227 | kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>"); |
0f4dafc0 | 228 | |
90bc6135 | 229 | error = create_dir(kobj); |
1da177e4 | 230 | if (error) { |
0f4dafc0 KS |
231 | kobj_kset_leave(kobj); |
232 | kobject_put(parent); | |
233 | kobj->parent = NULL; | |
dcd0da00 GKH |
234 | |
235 | /* be noisy on error issues */ | |
236 | if (error == -EEXIST) | |
282029c0 DW |
237 | WARN(1, "%s failed for %s with " |
238 | "-EEXIST, don't try to register things with " | |
239 | "the same name in the same directory.\n", | |
240 | __func__, kobject_name(kobj)); | |
dcd0da00 | 241 | else |
282029c0 DW |
242 | WARN(1, "%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 GKH |
251 | /** |
252 | * kobject_set_name_vargs - Set the name of an kobject | |
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 | { | |
9f255651 | 260 | char *s; |
663a4743 | 261 | |
8a577ffc KS |
262 | if (kobj->name && !fmt) |
263 | return 0; | |
264 | ||
2abf114f RV |
265 | s = kvasprintf(GFP_KERNEL, fmt, vargs); |
266 | if (!s) | |
a4ca6617 | 267 | return -ENOMEM; |
663a4743 | 268 | |
9f255651 | 269 | /* ewww... some of these buggers have '/' in the name ... */ |
2abf114f RV |
270 | strreplace(s, '/', '!'); |
271 | kfree(kobj->name); | |
272 | kobj->name = s; | |
9f255651 | 273 | |
663a4743 GKH |
274 | return 0; |
275 | } | |
1da177e4 LT |
276 | |
277 | /** | |
8c4606b1 | 278 | * kobject_set_name - Set the name of a kobject |
663a4743 | 279 | * @kobj: struct kobject to set the name of |
8c4606b1 | 280 | * @fmt: format string used to build the name |
1da177e4 | 281 | * |
8c4606b1 GKH |
282 | * This sets the name of the kobject. If you have already added the |
283 | * kobject to the system, you must call kobject_rename() in order to | |
284 | * change the name of the kobject. | |
1da177e4 | 285 | */ |
663a4743 | 286 | int kobject_set_name(struct kobject *kobj, const char *fmt, ...) |
1da177e4 | 287 | { |
a4ca6617 | 288 | va_list vargs; |
663a4743 | 289 | int retval; |
1da177e4 | 290 | |
a4ca6617 KS |
291 | va_start(vargs, fmt); |
292 | retval = kobject_set_name_vargs(kobj, fmt, vargs); | |
293 | va_end(vargs); | |
1da177e4 | 294 | |
663a4743 | 295 | return retval; |
1da177e4 | 296 | } |
1da177e4 LT |
297 | EXPORT_SYMBOL(kobject_set_name); |
298 | ||
e86000d0 | 299 | /** |
f9cb074b | 300 | * kobject_init - initialize a kobject structure |
e86000d0 GKH |
301 | * @kobj: pointer to the kobject to initialize |
302 | * @ktype: pointer to the ktype for this kobject. | |
303 | * | |
304 | * This function will properly initialize a kobject such that it can then | |
305 | * be passed to the kobject_add() call. | |
306 | * | |
307 | * After this function is called, the kobject MUST be cleaned up by a call | |
308 | * to kobject_put(), not by a call to kfree directly to ensure that all of | |
309 | * the memory is cleaned up properly. | |
310 | */ | |
f9cb074b | 311 | void kobject_init(struct kobject *kobj, struct kobj_type *ktype) |
e86000d0 GKH |
312 | { |
313 | char *err_str; | |
314 | ||
315 | if (!kobj) { | |
316 | err_str = "invalid kobject pointer!"; | |
317 | goto error; | |
318 | } | |
319 | if (!ktype) { | |
320 | err_str = "must have a ktype to be initialized properly!\n"; | |
321 | goto error; | |
322 | } | |
0f4dafc0 | 323 | if (kobj->state_initialized) { |
e86000d0 | 324 | /* do not error out as sometimes we can recover */ |
0f4dafc0 KS |
325 | printk(KERN_ERR "kobject (%p): tried to init an initialized " |
326 | "object, something is seriously wrong.\n", kobj); | |
e86000d0 GKH |
327 | dump_stack(); |
328 | } | |
329 | ||
a4573c48 | 330 | kobject_init_internal(kobj); |
e86000d0 GKH |
331 | kobj->ktype = ktype; |
332 | return; | |
333 | ||
334 | error: | |
0f4dafc0 | 335 | printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str); |
e86000d0 GKH |
336 | dump_stack(); |
337 | } | |
f9cb074b | 338 | EXPORT_SYMBOL(kobject_init); |
e86000d0 | 339 | |
8db14860 NI |
340 | static __printf(3, 0) int kobject_add_varg(struct kobject *kobj, |
341 | struct kobject *parent, | |
342 | const char *fmt, va_list vargs) | |
244f6cee | 343 | { |
244f6cee GKH |
344 | int retval; |
345 | ||
a4ca6617 | 346 | retval = kobject_set_name_vargs(kobj, fmt, vargs); |
244f6cee GKH |
347 | if (retval) { |
348 | printk(KERN_ERR "kobject: can not set name properly!\n"); | |
349 | return retval; | |
350 | } | |
351 | kobj->parent = parent; | |
9e7bbccd | 352 | return kobject_add_internal(kobj); |
244f6cee GKH |
353 | } |
354 | ||
355 | /** | |
b2d6db58 | 356 | * kobject_add - the main kobject add function |
244f6cee GKH |
357 | * @kobj: the kobject to add |
358 | * @parent: pointer to the parent of the kobject. | |
359 | * @fmt: format to name the kobject with. | |
360 | * | |
361 | * The kobject name is set and added to the kobject hierarchy in this | |
362 | * function. | |
363 | * | |
364 | * If @parent is set, then the parent of the @kobj will be set to it. | |
365 | * If @parent is NULL, then the parent of the @kobj will be set to the | |
9705710e | 366 | * kobject associated with the kset assigned to this kobject. If no kset |
244f6cee GKH |
367 | * is assigned to the kobject, then the kobject will be located in the |
368 | * root of the sysfs tree. | |
369 | * | |
370 | * If this function returns an error, kobject_put() must be called to | |
371 | * properly clean up the memory associated with the object. | |
244f6cee GKH |
372 | * Under no instance should the kobject that is passed to this function |
373 | * be directly freed with a call to kfree(), that can leak memory. | |
374 | * | |
0f4dafc0 | 375 | * Note, no "add" uevent will be created with this call, the caller should set |
244f6cee GKH |
376 | * up all of the necessary sysfs files for the object and then call |
377 | * kobject_uevent() with the UEVENT_ADD parameter to ensure that | |
378 | * userspace is properly notified of this kobject's creation. | |
379 | */ | |
b2d6db58 GKH |
380 | int kobject_add(struct kobject *kobj, struct kobject *parent, |
381 | const char *fmt, ...) | |
244f6cee GKH |
382 | { |
383 | va_list args; | |
384 | int retval; | |
385 | ||
386 | if (!kobj) | |
387 | return -EINVAL; | |
388 | ||
0f4dafc0 KS |
389 | if (!kobj->state_initialized) { |
390 | printk(KERN_ERR "kobject '%s' (%p): tried to add an " | |
391 | "uninitialized object, something is seriously wrong.\n", | |
392 | kobject_name(kobj), kobj); | |
393 | dump_stack(); | |
394 | return -EINVAL; | |
395 | } | |
244f6cee GKH |
396 | va_start(args, fmt); |
397 | retval = kobject_add_varg(kobj, parent, fmt, args); | |
398 | va_end(args); | |
399 | ||
400 | return retval; | |
401 | } | |
b2d6db58 | 402 | EXPORT_SYMBOL(kobject_add); |
244f6cee | 403 | |
c11c4154 GKH |
404 | /** |
405 | * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy | |
406 | * @kobj: pointer to the kobject to initialize | |
407 | * @ktype: pointer to the ktype for this kobject. | |
408 | * @parent: pointer to the parent of this kobject. | |
409 | * @fmt: the name of the kobject. | |
410 | * | |
f9cb074b | 411 | * This function combines the call to kobject_init() and |
b2d6db58 GKH |
412 | * kobject_add(). The same type of error handling after a call to |
413 | * kobject_add() and kobject lifetime rules are the same here. | |
c11c4154 GKH |
414 | */ |
415 | int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype, | |
416 | struct kobject *parent, const char *fmt, ...) | |
417 | { | |
418 | va_list args; | |
419 | int retval; | |
420 | ||
f9cb074b | 421 | kobject_init(kobj, ktype); |
c11c4154 GKH |
422 | |
423 | va_start(args, fmt); | |
424 | retval = kobject_add_varg(kobj, parent, fmt, args); | |
425 | va_end(args); | |
426 | ||
427 | return retval; | |
428 | } | |
429 | EXPORT_SYMBOL_GPL(kobject_init_and_add); | |
430 | ||
1da177e4 | 431 | /** |
e374a2bf GKH |
432 | * kobject_rename - change the name of an object |
433 | * @kobj: object in question. | |
434 | * @new_name: object's new name | |
030c1d2b EB |
435 | * |
436 | * It is the responsibility of the caller to provide mutual | |
437 | * exclusion between two different calls of kobject_rename | |
438 | * on the same kobject and to ensure that new_name is valid and | |
439 | * won't conflict with other kobjects. | |
1da177e4 | 440 | */ |
e374a2bf | 441 | int kobject_rename(struct kobject *kobj, const char *new_name) |
1da177e4 LT |
442 | { |
443 | int error = 0; | |
ca2f37db | 444 | const char *devpath = NULL; |
0b4a4fea | 445 | const char *dup_name = NULL, *name; |
ca2f37db JT |
446 | char *devpath_string = NULL; |
447 | char *envp[2]; | |
1da177e4 LT |
448 | |
449 | kobj = kobject_get(kobj); | |
450 | if (!kobj) | |
451 | return -EINVAL; | |
b592fcfe EB |
452 | if (!kobj->parent) |
453 | return -EINVAL; | |
ca2f37db JT |
454 | |
455 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
456 | if (!devpath) { | |
457 | error = -ENOMEM; | |
458 | goto out; | |
459 | } | |
460 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
461 | if (!devpath_string) { | |
462 | error = -ENOMEM; | |
463 | goto out; | |
464 | } | |
465 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
466 | envp[0] = devpath_string; | |
467 | envp[1] = NULL; | |
ca2f37db | 468 | |
0b4a4fea EB |
469 | name = dup_name = kstrdup(new_name, GFP_KERNEL); |
470 | if (!name) { | |
471 | error = -ENOMEM; | |
472 | goto out; | |
473 | } | |
474 | ||
e34ff490 | 475 | error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj)); |
0b4a4fea EB |
476 | if (error) |
477 | goto out; | |
478 | ||
479 | /* Install the new kobject name */ | |
480 | dup_name = kobj->name; | |
481 | kobj->name = name; | |
ca2f37db JT |
482 | |
483 | /* This function is mostly/only used for network interface. | |
484 | * Some hotplug package track interfaces by their name and | |
485 | * therefore want to know when the name is changed by the user. */ | |
0b4a4fea | 486 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); |
ca2f37db JT |
487 | |
488 | out: | |
0b4a4fea | 489 | kfree(dup_name); |
ca2f37db JT |
490 | kfree(devpath_string); |
491 | kfree(devpath); | |
b592fcfe EB |
492 | kobject_put(kobj); |
493 | ||
494 | return error; | |
495 | } | |
8344b568 | 496 | EXPORT_SYMBOL_GPL(kobject_rename); |
b592fcfe | 497 | |
8a82472f | 498 | /** |
e374a2bf GKH |
499 | * kobject_move - move object to another parent |
500 | * @kobj: object in question. | |
501 | * @new_parent: object's new parent (can be NULL) | |
8a82472f | 502 | */ |
8a82472f CH |
503 | int kobject_move(struct kobject *kobj, struct kobject *new_parent) |
504 | { | |
505 | int error; | |
506 | struct kobject *old_parent; | |
507 | const char *devpath = NULL; | |
508 | char *devpath_string = NULL; | |
509 | char *envp[2]; | |
510 | ||
511 | kobj = kobject_get(kobj); | |
512 | if (!kobj) | |
513 | return -EINVAL; | |
514 | new_parent = kobject_get(new_parent); | |
515 | if (!new_parent) { | |
c744aeae CH |
516 | if (kobj->kset) |
517 | new_parent = kobject_get(&kobj->kset->kobj); | |
8a82472f | 518 | } |
e34ff490 | 519 | |
8a82472f CH |
520 | /* old object path */ |
521 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
522 | if (!devpath) { | |
523 | error = -ENOMEM; | |
524 | goto out; | |
525 | } | |
526 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
527 | if (!devpath_string) { | |
528 | error = -ENOMEM; | |
529 | goto out; | |
530 | } | |
531 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
532 | envp[0] = devpath_string; | |
533 | envp[1] = NULL; | |
e34ff490 | 534 | error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj)); |
8a82472f CH |
535 | if (error) |
536 | goto out; | |
537 | old_parent = kobj->parent; | |
538 | kobj->parent = new_parent; | |
9e993efb | 539 | new_parent = NULL; |
8a82472f CH |
540 | kobject_put(old_parent); |
541 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); | |
542 | out: | |
9e993efb | 543 | kobject_put(new_parent); |
8a82472f CH |
544 | kobject_put(kobj); |
545 | kfree(devpath_string); | |
546 | kfree(devpath); | |
547 | return error; | |
548 | } | |
24199d20 | 549 | EXPORT_SYMBOL_GPL(kobject_move); |
8a82472f | 550 | |
1da177e4 | 551 | /** |
e374a2bf GKH |
552 | * kobject_del - unlink kobject from hierarchy. |
553 | * @kobj: object. | |
1da177e4 | 554 | */ |
e374a2bf | 555 | void kobject_del(struct kobject *kobj) |
1da177e4 | 556 | { |
324a56e1 | 557 | struct kernfs_node *sd; |
26ea12de | 558 | |
31b9025a GKH |
559 | if (!kobj) |
560 | return; | |
0f4dafc0 | 561 | |
26ea12de | 562 | sd = kobj->sd; |
1da177e4 | 563 | sysfs_remove_dir(kobj); |
26ea12de TH |
564 | sysfs_put(sd); |
565 | ||
0f4dafc0 KS |
566 | kobj->state_in_sysfs = 0; |
567 | kobj_kset_leave(kobj); | |
568 | kobject_put(kobj->parent); | |
569 | kobj->parent = NULL; | |
1da177e4 | 570 | } |
fa40ae34 | 571 | EXPORT_SYMBOL(kobject_del); |
1da177e4 | 572 | |
1da177e4 | 573 | /** |
e374a2bf GKH |
574 | * kobject_get - increment refcount for object. |
575 | * @kobj: object. | |
1da177e4 | 576 | */ |
e374a2bf | 577 | struct kobject *kobject_get(struct kobject *kobj) |
1da177e4 | 578 | { |
d82d54af EZ |
579 | if (kobj) { |
580 | if (!kobj->state_initialized) | |
581 | WARN(1, KERN_WARNING "kobject: '%s' (%p): is not " | |
582 | "initialized, yet kobject_get() is being " | |
583 | "called.\n", kobject_name(kobj), kobj); | |
1da177e4 | 584 | kref_get(&kobj->kref); |
d82d54af | 585 | } |
1da177e4 LT |
586 | return kobj; |
587 | } | |
fa40ae34 | 588 | EXPORT_SYMBOL(kobject_get); |
1da177e4 | 589 | |
2d864e41 | 590 | static struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj) |
a49b7e82 LT |
591 | { |
592 | if (!kref_get_unless_zero(&kobj->kref)) | |
593 | kobj = NULL; | |
594 | return kobj; | |
595 | } | |
596 | ||
18041f47 GKH |
597 | /* |
598 | * kobject_cleanup - free kobject resources. | |
599 | * @kobj: object to cleanup | |
1da177e4 | 600 | */ |
18041f47 | 601 | static void kobject_cleanup(struct kobject *kobj) |
1da177e4 | 602 | { |
0f4dafc0 | 603 | struct kobj_type *t = get_ktype(kobj); |
af5ca3f4 | 604 | const char *name = kobj->name; |
1da177e4 | 605 | |
c817a67e RK |
606 | pr_debug("kobject: '%s' (%p): %s, parent %p\n", |
607 | kobject_name(kobj), kobj, __func__, kobj->parent); | |
0f4dafc0 KS |
608 | |
609 | if (t && !t->release) | |
610 | pr_debug("kobject: '%s' (%p): does not have a release() " | |
611 | "function, it is broken and must be fixed.\n", | |
612 | kobject_name(kobj), kobj); | |
613 | ||
614 | /* send "remove" if the caller did not do it but sent "add" */ | |
615 | if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) { | |
616 | pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n", | |
617 | kobject_name(kobj), kobj); | |
618 | kobject_uevent(kobj, KOBJ_REMOVE); | |
619 | } | |
620 | ||
621 | /* remove from sysfs if the caller did not do it */ | |
622 | if (kobj->state_in_sysfs) { | |
623 | pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n", | |
624 | kobject_name(kobj), kobj); | |
625 | kobject_del(kobj); | |
626 | } | |
627 | ||
ce2c9cb0 | 628 | if (t && t->release) { |
0f4dafc0 KS |
629 | pr_debug("kobject: '%s' (%p): calling ktype release\n", |
630 | kobject_name(kobj), kobj); | |
1da177e4 | 631 | t->release(kobj); |
0f4dafc0 KS |
632 | } |
633 | ||
634 | /* free name if we allocated it */ | |
af5ca3f4 | 635 | if (name) { |
0f4dafc0 | 636 | pr_debug("kobject: '%s': free name\n", name); |
ce2c9cb0 GKH |
637 | kfree(name); |
638 | } | |
1da177e4 LT |
639 | } |
640 | ||
c817a67e RK |
641 | #ifdef CONFIG_DEBUG_KOBJECT_RELEASE |
642 | static void kobject_delayed_cleanup(struct work_struct *work) | |
643 | { | |
644 | kobject_cleanup(container_of(to_delayed_work(work), | |
645 | struct kobject, release)); | |
646 | } | |
647 | #endif | |
648 | ||
1da177e4 LT |
649 | static void kobject_release(struct kref *kref) |
650 | { | |
c817a67e RK |
651 | struct kobject *kobj = container_of(kref, struct kobject, kref); |
652 | #ifdef CONFIG_DEBUG_KOBJECT_RELEASE | |
89c86a64 BH |
653 | unsigned long delay = HZ + HZ * (get_random_int() & 0x3); |
654 | pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n", | |
655 | kobject_name(kobj), kobj, __func__, kobj->parent, delay); | |
c817a67e | 656 | INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup); |
89c86a64 BH |
657 | |
658 | schedule_delayed_work(&kobj->release, delay); | |
c817a67e RK |
659 | #else |
660 | kobject_cleanup(kobj); | |
661 | #endif | |
1da177e4 LT |
662 | } |
663 | ||
664 | /** | |
e374a2bf GKH |
665 | * kobject_put - decrement refcount for object. |
666 | * @kobj: object. | |
1da177e4 | 667 | * |
e374a2bf | 668 | * Decrement the refcount, and if 0, call kobject_cleanup(). |
1da177e4 | 669 | */ |
e374a2bf | 670 | void kobject_put(struct kobject *kobj) |
1da177e4 | 671 | { |
c1ebdae5 | 672 | if (kobj) { |
d955c78a AV |
673 | if (!kobj->state_initialized) |
674 | WARN(1, KERN_WARNING "kobject: '%s' (%p): is not " | |
c1ebdae5 GKH |
675 | "initialized, yet kobject_put() is being " |
676 | "called.\n", kobject_name(kobj), kobj); | |
1da177e4 | 677 | kref_put(&kobj->kref, kobject_release); |
c1ebdae5 | 678 | } |
1da177e4 | 679 | } |
fa40ae34 | 680 | EXPORT_SYMBOL(kobject_put); |
1da177e4 | 681 | |
3f9e3ee9 | 682 | static void dynamic_kobj_release(struct kobject *kobj) |
7423172a | 683 | { |
810304db | 684 | pr_debug("kobject: (%p): %s\n", kobj, __func__); |
7423172a JN |
685 | kfree(kobj); |
686 | } | |
687 | ||
3f9e3ee9 | 688 | static struct kobj_type dynamic_kobj_ktype = { |
386f275f KS |
689 | .release = dynamic_kobj_release, |
690 | .sysfs_ops = &kobj_sysfs_ops, | |
7423172a JN |
691 | }; |
692 | ||
43968d2f | 693 | /** |
3f9e3ee9 GKH |
694 | * kobject_create - create a struct kobject dynamically |
695 | * | |
696 | * This function creates a kobject structure dynamically and sets it up | |
697 | * to be a "dynamic" kobject with a default release function set up. | |
698 | * | |
699 | * If the kobject was not able to be created, NULL will be returned. | |
43968d2f | 700 | * The kobject structure returned from here must be cleaned up with a |
f9cb074b | 701 | * call to kobject_put() and not kfree(), as kobject_init() has |
43968d2f | 702 | * already been called on this structure. |
3f9e3ee9 | 703 | */ |
43968d2f | 704 | struct kobject *kobject_create(void) |
3f9e3ee9 GKH |
705 | { |
706 | struct kobject *kobj; | |
707 | ||
708 | kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); | |
709 | if (!kobj) | |
710 | return NULL; | |
711 | ||
f9cb074b | 712 | kobject_init(kobj, &dynamic_kobj_ktype); |
3f9e3ee9 GKH |
713 | return kobj; |
714 | } | |
715 | ||
716 | /** | |
717 | * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs | |
718 | * | |
9ff1f838 | 719 | * @name: the name for the kobject |
3f9e3ee9 GKH |
720 | * @parent: the parent kobject of this kobject, if any. |
721 | * | |
f70701a3 | 722 | * This function creates a kobject structure dynamically and registers it |
3f9e3ee9 | 723 | * with sysfs. When you are finished with this structure, call |
78a2d906 | 724 | * kobject_put() and the structure will be dynamically freed when |
3f9e3ee9 GKH |
725 | * it is no longer being used. |
726 | * | |
727 | * If the kobject was not able to be created, NULL will be returned. | |
728 | */ | |
729 | struct kobject *kobject_create_and_add(const char *name, struct kobject *parent) | |
730 | { | |
731 | struct kobject *kobj; | |
732 | int retval; | |
733 | ||
734 | kobj = kobject_create(); | |
735 | if (!kobj) | |
736 | return NULL; | |
737 | ||
b2d6db58 | 738 | retval = kobject_add(kobj, parent, "%s", name); |
3f9e3ee9 GKH |
739 | if (retval) { |
740 | printk(KERN_WARNING "%s: kobject_add error: %d\n", | |
810304db | 741 | __func__, retval); |
3f9e3ee9 GKH |
742 | kobject_put(kobj); |
743 | kobj = NULL; | |
744 | } | |
745 | return kobj; | |
746 | } | |
747 | EXPORT_SYMBOL_GPL(kobject_create_and_add); | |
748 | ||
1da177e4 | 749 | /** |
e374a2bf GKH |
750 | * kset_init - initialize a kset for use |
751 | * @k: kset | |
1da177e4 | 752 | */ |
e374a2bf | 753 | void kset_init(struct kset *k) |
1da177e4 | 754 | { |
e1543ddf | 755 | kobject_init_internal(&k->kobj); |
1da177e4 LT |
756 | INIT_LIST_HEAD(&k->list); |
757 | spin_lock_init(&k->list_lock); | |
758 | } | |
759 | ||
23b5212c KS |
760 | /* default kobject attribute operations */ |
761 | static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr, | |
762 | char *buf) | |
763 | { | |
764 | struct kobj_attribute *kattr; | |
765 | ssize_t ret = -EIO; | |
766 | ||
767 | kattr = container_of(attr, struct kobj_attribute, attr); | |
768 | if (kattr->show) | |
769 | ret = kattr->show(kobj, kattr, buf); | |
770 | return ret; | |
771 | } | |
772 | ||
773 | static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr, | |
774 | const char *buf, size_t count) | |
775 | { | |
776 | struct kobj_attribute *kattr; | |
777 | ssize_t ret = -EIO; | |
778 | ||
779 | kattr = container_of(attr, struct kobj_attribute, attr); | |
780 | if (kattr->store) | |
781 | ret = kattr->store(kobj, kattr, buf, count); | |
782 | return ret; | |
783 | } | |
784 | ||
52cf25d0 | 785 | const struct sysfs_ops kobj_sysfs_ops = { |
23b5212c KS |
786 | .show = kobj_attr_show, |
787 | .store = kobj_attr_store, | |
788 | }; | |
29dfe2dc | 789 | EXPORT_SYMBOL_GPL(kobj_sysfs_ops); |
1da177e4 | 790 | |
1da177e4 | 791 | /** |
e374a2bf GKH |
792 | * kset_register - initialize and add a kset. |
793 | * @k: kset. | |
1da177e4 | 794 | */ |
e374a2bf | 795 | int kset_register(struct kset *k) |
1da177e4 | 796 | { |
80f03e34 KS |
797 | int err; |
798 | ||
31b9025a GKH |
799 | if (!k) |
800 | return -EINVAL; | |
80f03e34 | 801 | |
1da177e4 | 802 | kset_init(k); |
12e339ac | 803 | err = kobject_add_internal(&k->kobj); |
80f03e34 KS |
804 | if (err) |
805 | return err; | |
806 | kobject_uevent(&k->kobj, KOBJ_ADD); | |
807 | return 0; | |
1da177e4 | 808 | } |
fa40ae34 | 809 | EXPORT_SYMBOL(kset_register); |
1da177e4 | 810 | |
1da177e4 | 811 | /** |
e374a2bf GKH |
812 | * kset_unregister - remove a kset. |
813 | * @k: kset. | |
1da177e4 | 814 | */ |
e374a2bf | 815 | void kset_unregister(struct kset *k) |
1da177e4 | 816 | { |
31b9025a GKH |
817 | if (!k) |
818 | return; | |
35a5fe69 | 819 | kobject_del(&k->kobj); |
78a2d906 | 820 | kobject_put(&k->kobj); |
1da177e4 | 821 | } |
fa40ae34 | 822 | EXPORT_SYMBOL(kset_unregister); |
1da177e4 | 823 | |
1da177e4 | 824 | /** |
e374a2bf GKH |
825 | * kset_find_obj - search for object in kset. |
826 | * @kset: kset we're looking in. | |
827 | * @name: object's name. | |
1da177e4 | 828 | * |
e374a2bf GKH |
829 | * Lock kset via @kset->subsys, and iterate over @kset->list, |
830 | * looking for a matching kobject. If matching object is found | |
831 | * take a reference and return the object. | |
1da177e4 | 832 | */ |
e374a2bf | 833 | struct kobject *kset_find_obj(struct kset *kset, const char *name) |
1da177e4 | 834 | { |
c6a2a3dc | 835 | struct kobject *k; |
e374a2bf | 836 | struct kobject *ret = NULL; |
1da177e4 LT |
837 | |
838 | spin_lock(&kset->list_lock); | |
c25d1dfb | 839 | |
c6a2a3dc | 840 | list_for_each_entry(k, &kset->list, entry) { |
e374a2bf | 841 | if (kobject_name(k) && !strcmp(kobject_name(k), name)) { |
a49b7e82 | 842 | ret = kobject_get_unless_zero(k); |
1da177e4 LT |
843 | break; |
844 | } | |
845 | } | |
c25d1dfb | 846 | |
1da177e4 LT |
847 | spin_unlock(&kset->list_lock); |
848 | return ret; | |
849 | } | |
850 | ||
b727c702 GKH |
851 | static void kset_release(struct kobject *kobj) |
852 | { | |
853 | struct kset *kset = container_of(kobj, struct kset, kobj); | |
9f66fa2a | 854 | pr_debug("kobject: '%s' (%p): %s\n", |
810304db | 855 | kobject_name(kobj), kobj, __func__); |
b727c702 GKH |
856 | kfree(kset); |
857 | } | |
858 | ||
386f275f KS |
859 | static struct kobj_type kset_ktype = { |
860 | .sysfs_ops = &kobj_sysfs_ops, | |
b727c702 GKH |
861 | .release = kset_release, |
862 | }; | |
863 | ||
864 | /** | |
865 | * kset_create - create a struct kset dynamically | |
866 | * | |
867 | * @name: the name for the kset | |
868 | * @uevent_ops: a struct kset_uevent_ops for the kset | |
869 | * @parent_kobj: the parent kobject of this kset, if any. | |
870 | * | |
871 | * This function creates a kset structure dynamically. This structure can | |
872 | * then be registered with the system and show up in sysfs with a call to | |
873 | * kset_register(). When you are finished with this structure, if | |
874 | * kset_register() has been called, call kset_unregister() and the | |
875 | * structure will be dynamically freed when it is no longer being used. | |
876 | * | |
877 | * If the kset was not able to be created, NULL will be returned. | |
878 | */ | |
879 | static struct kset *kset_create(const char *name, | |
9cd43611 | 880 | const struct kset_uevent_ops *uevent_ops, |
b727c702 GKH |
881 | struct kobject *parent_kobj) |
882 | { | |
883 | struct kset *kset; | |
d9cd8f37 | 884 | int retval; |
b727c702 GKH |
885 | |
886 | kset = kzalloc(sizeof(*kset), GFP_KERNEL); | |
887 | if (!kset) | |
888 | return NULL; | |
b7165ebb | 889 | retval = kobject_set_name(&kset->kobj, "%s", name); |
d9cd8f37 DY |
890 | if (retval) { |
891 | kfree(kset); | |
892 | return NULL; | |
893 | } | |
b727c702 GKH |
894 | kset->uevent_ops = uevent_ops; |
895 | kset->kobj.parent = parent_kobj; | |
896 | ||
897 | /* | |
386f275f | 898 | * The kobject of this kset will have a type of kset_ktype and belong to |
b727c702 GKH |
899 | * no kset itself. That way we can properly free it when it is |
900 | * finished being used. | |
901 | */ | |
386f275f | 902 | kset->kobj.ktype = &kset_ktype; |
b727c702 GKH |
903 | kset->kobj.kset = NULL; |
904 | ||
905 | return kset; | |
906 | } | |
907 | ||
908 | /** | |
909 | * kset_create_and_add - create a struct kset dynamically and add it to sysfs | |
910 | * | |
911 | * @name: the name for the kset | |
912 | * @uevent_ops: a struct kset_uevent_ops for the kset | |
913 | * @parent_kobj: the parent kobject of this kset, if any. | |
914 | * | |
915 | * This function creates a kset structure dynamically and registers it | |
916 | * with sysfs. When you are finished with this structure, call | |
917 | * kset_unregister() and the structure will be dynamically freed when it | |
918 | * is no longer being used. | |
919 | * | |
920 | * If the kset was not able to be created, NULL will be returned. | |
921 | */ | |
922 | struct kset *kset_create_and_add(const char *name, | |
9cd43611 | 923 | const struct kset_uevent_ops *uevent_ops, |
b727c702 GKH |
924 | struct kobject *parent_kobj) |
925 | { | |
926 | struct kset *kset; | |
927 | int error; | |
928 | ||
929 | kset = kset_create(name, uevent_ops, parent_kobj); | |
930 | if (!kset) | |
931 | return NULL; | |
932 | error = kset_register(kset); | |
933 | if (error) { | |
934 | kfree(kset); | |
935 | return NULL; | |
936 | } | |
937 | return kset; | |
938 | } | |
939 | EXPORT_SYMBOL_GPL(kset_create_and_add); | |
940 | ||
bc451f20 EB |
941 | |
942 | static DEFINE_SPINLOCK(kobj_ns_type_lock); | |
943 | static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES]; | |
944 | ||
945 | int kobj_ns_type_register(const struct kobj_ns_type_operations *ops) | |
946 | { | |
947 | enum kobj_ns_type type = ops->type; | |
948 | int error; | |
949 | ||
950 | spin_lock(&kobj_ns_type_lock); | |
951 | ||
952 | error = -EINVAL; | |
953 | if (type >= KOBJ_NS_TYPES) | |
954 | goto out; | |
955 | ||
956 | error = -EINVAL; | |
957 | if (type <= KOBJ_NS_TYPE_NONE) | |
958 | goto out; | |
959 | ||
960 | error = -EBUSY; | |
961 | if (kobj_ns_ops_tbl[type]) | |
962 | goto out; | |
963 | ||
964 | error = 0; | |
965 | kobj_ns_ops_tbl[type] = ops; | |
966 | ||
967 | out: | |
968 | spin_unlock(&kobj_ns_type_lock); | |
969 | return error; | |
970 | } | |
971 | ||
972 | int kobj_ns_type_registered(enum kobj_ns_type type) | |
973 | { | |
974 | int registered = 0; | |
975 | ||
976 | spin_lock(&kobj_ns_type_lock); | |
977 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES)) | |
978 | registered = kobj_ns_ops_tbl[type] != NULL; | |
979 | spin_unlock(&kobj_ns_type_lock); | |
980 | ||
981 | return registered; | |
982 | } | |
983 | ||
984 | const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent) | |
985 | { | |
986 | const struct kobj_ns_type_operations *ops = NULL; | |
987 | ||
41fb96a4 | 988 | if (parent && parent->ktype && parent->ktype->child_ns_type) |
bc451f20 EB |
989 | ops = parent->ktype->child_ns_type(parent); |
990 | ||
991 | return ops; | |
992 | } | |
993 | ||
994 | const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj) | |
995 | { | |
996 | return kobj_child_ns_ops(kobj->parent); | |
997 | } | |
998 | ||
7dc5dbc8 EB |
999 | bool kobj_ns_current_may_mount(enum kobj_ns_type type) |
1000 | { | |
730d7d33 | 1001 | bool may_mount = true; |
7dc5dbc8 EB |
1002 | |
1003 | spin_lock(&kobj_ns_type_lock); | |
1004 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1005 | kobj_ns_ops_tbl[type]) | |
1006 | may_mount = kobj_ns_ops_tbl[type]->current_may_mount(); | |
1007 | spin_unlock(&kobj_ns_type_lock); | |
1008 | ||
1009 | return may_mount; | |
1010 | } | |
bc451f20 | 1011 | |
a685e089 | 1012 | void *kobj_ns_grab_current(enum kobj_ns_type type) |
bc451f20 | 1013 | { |
a685e089 | 1014 | void *ns = NULL; |
bc451f20 EB |
1015 | |
1016 | spin_lock(&kobj_ns_type_lock); | |
1017 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1018 | kobj_ns_ops_tbl[type]) | |
a685e089 | 1019 | ns = kobj_ns_ops_tbl[type]->grab_current_ns(); |
bc451f20 EB |
1020 | spin_unlock(&kobj_ns_type_lock); |
1021 | ||
1022 | return ns; | |
1023 | } | |
1024 | ||
1025 | const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk) | |
1026 | { | |
1027 | const void *ns = NULL; | |
1028 | ||
1029 | spin_lock(&kobj_ns_type_lock); | |
1030 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1031 | kobj_ns_ops_tbl[type]) | |
1032 | ns = kobj_ns_ops_tbl[type]->netlink_ns(sk); | |
1033 | spin_unlock(&kobj_ns_type_lock); | |
1034 | ||
1035 | return ns; | |
1036 | } | |
1037 | ||
1038 | const void *kobj_ns_initial(enum kobj_ns_type type) | |
1039 | { | |
1040 | const void *ns = NULL; | |
1041 | ||
1042 | spin_lock(&kobj_ns_type_lock); | |
1043 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1044 | kobj_ns_ops_tbl[type]) | |
1045 | ns = kobj_ns_ops_tbl[type]->initial_ns(); | |
1046 | spin_unlock(&kobj_ns_type_lock); | |
1047 | ||
1048 | return ns; | |
1049 | } | |
1050 | ||
a685e089 | 1051 | void kobj_ns_drop(enum kobj_ns_type type, void *ns) |
bc451f20 | 1052 | { |
a685e089 AV |
1053 | spin_lock(&kobj_ns_type_lock); |
1054 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1055 | kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns) | |
1056 | kobj_ns_ops_tbl[type]->drop_ns(ns); | |
1057 | spin_unlock(&kobj_ns_type_lock); | |
bc451f20 | 1058 | } |