Commit | Line | Data |
---|---|---|
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; | |
af882cb0 | 130 | memcpy(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) | |
a5f42767 DV |
237 | pr_err("%s failed for %s with -EEXIST, don't try to register things with the same name in the same directory.\n", |
238 | __func__, kobject_name(kobj)); | |
dcd0da00 | 239 | else |
a5f42767 DV |
240 | pr_err("%s failed for %s (error: %d parent: %s)\n", |
241 | __func__, kobject_name(kobj), error, | |
242 | parent ? kobject_name(parent) : "'none'"); | |
0f4dafc0 KS |
243 | } else |
244 | kobj->state_in_sysfs = 1; | |
1da177e4 LT |
245 | |
246 | return error; | |
247 | } | |
248 | ||
663a4743 GKH |
249 | /** |
250 | * kobject_set_name_vargs - Set the name of an kobject | |
251 | * @kobj: struct kobject to set the name of | |
252 | * @fmt: format string used to build the name | |
253 | * @vargs: vargs to format the string. | |
254 | */ | |
1fa5ae85 | 255 | int kobject_set_name_vargs(struct kobject *kobj, const char *fmt, |
663a4743 GKH |
256 | va_list vargs) |
257 | { | |
f773f32d | 258 | const char *s; |
663a4743 | 259 | |
8a577ffc KS |
260 | if (kobj->name && !fmt) |
261 | return 0; | |
262 | ||
f773f32d | 263 | s = kvasprintf_const(GFP_KERNEL, fmt, vargs); |
2abf114f | 264 | if (!s) |
a4ca6617 | 265 | return -ENOMEM; |
663a4743 | 266 | |
f773f32d RV |
267 | /* |
268 | * ewww... some of these buggers have '/' in the name ... If | |
269 | * that's the case, we need to make sure we have an actual | |
270 | * allocated copy to modify, since kvasprintf_const may have | |
271 | * returned something from .rodata. | |
272 | */ | |
273 | if (strchr(s, '/')) { | |
274 | char *t; | |
275 | ||
276 | t = kstrdup(s, GFP_KERNEL); | |
277 | kfree_const(s); | |
278 | if (!t) | |
279 | return -ENOMEM; | |
280 | strreplace(t, '/', '!'); | |
281 | s = t; | |
282 | } | |
283 | kfree_const(kobj->name); | |
2abf114f | 284 | kobj->name = s; |
9f255651 | 285 | |
663a4743 GKH |
286 | return 0; |
287 | } | |
1da177e4 LT |
288 | |
289 | /** | |
8c4606b1 | 290 | * kobject_set_name - Set the name of a kobject |
663a4743 | 291 | * @kobj: struct kobject to set the name of |
8c4606b1 | 292 | * @fmt: format string used to build the name |
1da177e4 | 293 | * |
8c4606b1 GKH |
294 | * This sets the name of the kobject. If you have already added the |
295 | * kobject to the system, you must call kobject_rename() in order to | |
296 | * change the name of the kobject. | |
1da177e4 | 297 | */ |
663a4743 | 298 | int kobject_set_name(struct kobject *kobj, const char *fmt, ...) |
1da177e4 | 299 | { |
a4ca6617 | 300 | va_list vargs; |
663a4743 | 301 | int retval; |
1da177e4 | 302 | |
a4ca6617 KS |
303 | va_start(vargs, fmt); |
304 | retval = kobject_set_name_vargs(kobj, fmt, vargs); | |
305 | va_end(vargs); | |
1da177e4 | 306 | |
663a4743 | 307 | return retval; |
1da177e4 | 308 | } |
1da177e4 LT |
309 | EXPORT_SYMBOL(kobject_set_name); |
310 | ||
e86000d0 | 311 | /** |
f9cb074b | 312 | * kobject_init - initialize a kobject structure |
e86000d0 GKH |
313 | * @kobj: pointer to the kobject to initialize |
314 | * @ktype: pointer to the ktype for this kobject. | |
315 | * | |
316 | * This function will properly initialize a kobject such that it can then | |
317 | * be passed to the kobject_add() call. | |
318 | * | |
319 | * After this function is called, the kobject MUST be cleaned up by a call | |
320 | * to kobject_put(), not by a call to kfree directly to ensure that all of | |
321 | * the memory is cleaned up properly. | |
322 | */ | |
f9cb074b | 323 | void kobject_init(struct kobject *kobj, struct kobj_type *ktype) |
e86000d0 GKH |
324 | { |
325 | char *err_str; | |
326 | ||
327 | if (!kobj) { | |
328 | err_str = "invalid kobject pointer!"; | |
329 | goto error; | |
330 | } | |
331 | if (!ktype) { | |
332 | err_str = "must have a ktype to be initialized properly!\n"; | |
333 | goto error; | |
334 | } | |
0f4dafc0 | 335 | if (kobj->state_initialized) { |
e86000d0 | 336 | /* do not error out as sometimes we can recover */ |
0f4dafc0 KS |
337 | printk(KERN_ERR "kobject (%p): tried to init an initialized " |
338 | "object, something is seriously wrong.\n", kobj); | |
e86000d0 GKH |
339 | dump_stack(); |
340 | } | |
341 | ||
a4573c48 | 342 | kobject_init_internal(kobj); |
e86000d0 GKH |
343 | kobj->ktype = ktype; |
344 | return; | |
345 | ||
346 | error: | |
0f4dafc0 | 347 | printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str); |
e86000d0 GKH |
348 | dump_stack(); |
349 | } | |
f9cb074b | 350 | EXPORT_SYMBOL(kobject_init); |
e86000d0 | 351 | |
8db14860 NI |
352 | static __printf(3, 0) int kobject_add_varg(struct kobject *kobj, |
353 | struct kobject *parent, | |
354 | const char *fmt, va_list vargs) | |
244f6cee | 355 | { |
244f6cee GKH |
356 | int retval; |
357 | ||
a4ca6617 | 358 | retval = kobject_set_name_vargs(kobj, fmt, vargs); |
244f6cee GKH |
359 | if (retval) { |
360 | printk(KERN_ERR "kobject: can not set name properly!\n"); | |
361 | return retval; | |
362 | } | |
363 | kobj->parent = parent; | |
9e7bbccd | 364 | return kobject_add_internal(kobj); |
244f6cee GKH |
365 | } |
366 | ||
367 | /** | |
b2d6db58 | 368 | * kobject_add - the main kobject add function |
244f6cee GKH |
369 | * @kobj: the kobject to add |
370 | * @parent: pointer to the parent of the kobject. | |
371 | * @fmt: format to name the kobject with. | |
372 | * | |
373 | * The kobject name is set and added to the kobject hierarchy in this | |
374 | * function. | |
375 | * | |
376 | * If @parent is set, then the parent of the @kobj will be set to it. | |
377 | * If @parent is NULL, then the parent of the @kobj will be set to the | |
9705710e | 378 | * kobject associated with the kset assigned to this kobject. If no kset |
244f6cee GKH |
379 | * is assigned to the kobject, then the kobject will be located in the |
380 | * root of the sysfs tree. | |
381 | * | |
382 | * If this function returns an error, kobject_put() must be called to | |
383 | * properly clean up the memory associated with the object. | |
244f6cee GKH |
384 | * Under no instance should the kobject that is passed to this function |
385 | * be directly freed with a call to kfree(), that can leak memory. | |
386 | * | |
0f4dafc0 | 387 | * Note, no "add" uevent will be created with this call, the caller should set |
244f6cee GKH |
388 | * up all of the necessary sysfs files for the object and then call |
389 | * kobject_uevent() with the UEVENT_ADD parameter to ensure that | |
390 | * userspace is properly notified of this kobject's creation. | |
391 | */ | |
b2d6db58 GKH |
392 | int kobject_add(struct kobject *kobj, struct kobject *parent, |
393 | const char *fmt, ...) | |
244f6cee GKH |
394 | { |
395 | va_list args; | |
396 | int retval; | |
397 | ||
398 | if (!kobj) | |
399 | return -EINVAL; | |
400 | ||
0f4dafc0 KS |
401 | if (!kobj->state_initialized) { |
402 | printk(KERN_ERR "kobject '%s' (%p): tried to add an " | |
403 | "uninitialized object, something is seriously wrong.\n", | |
404 | kobject_name(kobj), kobj); | |
405 | dump_stack(); | |
406 | return -EINVAL; | |
407 | } | |
244f6cee GKH |
408 | va_start(args, fmt); |
409 | retval = kobject_add_varg(kobj, parent, fmt, args); | |
410 | va_end(args); | |
411 | ||
412 | return retval; | |
413 | } | |
b2d6db58 | 414 | EXPORT_SYMBOL(kobject_add); |
244f6cee | 415 | |
c11c4154 GKH |
416 | /** |
417 | * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy | |
418 | * @kobj: pointer to the kobject to initialize | |
419 | * @ktype: pointer to the ktype for this kobject. | |
420 | * @parent: pointer to the parent of this kobject. | |
421 | * @fmt: the name of the kobject. | |
422 | * | |
f9cb074b | 423 | * This function combines the call to kobject_init() and |
b2d6db58 GKH |
424 | * kobject_add(). The same type of error handling after a call to |
425 | * kobject_add() and kobject lifetime rules are the same here. | |
c11c4154 GKH |
426 | */ |
427 | int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype, | |
428 | struct kobject *parent, const char *fmt, ...) | |
429 | { | |
430 | va_list args; | |
431 | int retval; | |
432 | ||
f9cb074b | 433 | kobject_init(kobj, ktype); |
c11c4154 GKH |
434 | |
435 | va_start(args, fmt); | |
436 | retval = kobject_add_varg(kobj, parent, fmt, args); | |
437 | va_end(args); | |
438 | ||
439 | return retval; | |
440 | } | |
441 | EXPORT_SYMBOL_GPL(kobject_init_and_add); | |
442 | ||
1da177e4 | 443 | /** |
e374a2bf GKH |
444 | * kobject_rename - change the name of an object |
445 | * @kobj: object in question. | |
446 | * @new_name: object's new name | |
030c1d2b EB |
447 | * |
448 | * It is the responsibility of the caller to provide mutual | |
449 | * exclusion between two different calls of kobject_rename | |
450 | * on the same kobject and to ensure that new_name is valid and | |
451 | * won't conflict with other kobjects. | |
1da177e4 | 452 | */ |
e374a2bf | 453 | int kobject_rename(struct kobject *kobj, const char *new_name) |
1da177e4 LT |
454 | { |
455 | int error = 0; | |
ca2f37db | 456 | const char *devpath = NULL; |
0b4a4fea | 457 | const char *dup_name = NULL, *name; |
ca2f37db JT |
458 | char *devpath_string = NULL; |
459 | char *envp[2]; | |
1da177e4 LT |
460 | |
461 | kobj = kobject_get(kobj); | |
462 | if (!kobj) | |
463 | return -EINVAL; | |
b592fcfe EB |
464 | if (!kobj->parent) |
465 | return -EINVAL; | |
ca2f37db JT |
466 | |
467 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
468 | if (!devpath) { | |
469 | error = -ENOMEM; | |
470 | goto out; | |
471 | } | |
472 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
473 | if (!devpath_string) { | |
474 | error = -ENOMEM; | |
475 | goto out; | |
476 | } | |
477 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
478 | envp[0] = devpath_string; | |
479 | envp[1] = NULL; | |
ca2f37db | 480 | |
f773f32d | 481 | name = dup_name = kstrdup_const(new_name, GFP_KERNEL); |
0b4a4fea EB |
482 | if (!name) { |
483 | error = -ENOMEM; | |
484 | goto out; | |
485 | } | |
486 | ||
e34ff490 | 487 | error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj)); |
0b4a4fea EB |
488 | if (error) |
489 | goto out; | |
490 | ||
491 | /* Install the new kobject name */ | |
492 | dup_name = kobj->name; | |
493 | kobj->name = name; | |
ca2f37db JT |
494 | |
495 | /* This function is mostly/only used for network interface. | |
496 | * Some hotplug package track interfaces by their name and | |
497 | * therefore want to know when the name is changed by the user. */ | |
0b4a4fea | 498 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); |
ca2f37db JT |
499 | |
500 | out: | |
f773f32d | 501 | kfree_const(dup_name); |
ca2f37db JT |
502 | kfree(devpath_string); |
503 | kfree(devpath); | |
b592fcfe EB |
504 | kobject_put(kobj); |
505 | ||
506 | return error; | |
507 | } | |
8344b568 | 508 | EXPORT_SYMBOL_GPL(kobject_rename); |
b592fcfe | 509 | |
8a82472f | 510 | /** |
e374a2bf GKH |
511 | * kobject_move - move object to another parent |
512 | * @kobj: object in question. | |
513 | * @new_parent: object's new parent (can be NULL) | |
8a82472f | 514 | */ |
8a82472f CH |
515 | int kobject_move(struct kobject *kobj, struct kobject *new_parent) |
516 | { | |
517 | int error; | |
518 | struct kobject *old_parent; | |
519 | const char *devpath = NULL; | |
520 | char *devpath_string = NULL; | |
521 | char *envp[2]; | |
522 | ||
523 | kobj = kobject_get(kobj); | |
524 | if (!kobj) | |
525 | return -EINVAL; | |
526 | new_parent = kobject_get(new_parent); | |
527 | if (!new_parent) { | |
c744aeae CH |
528 | if (kobj->kset) |
529 | new_parent = kobject_get(&kobj->kset->kobj); | |
8a82472f | 530 | } |
e34ff490 | 531 | |
8a82472f CH |
532 | /* old object path */ |
533 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
534 | if (!devpath) { | |
535 | error = -ENOMEM; | |
536 | goto out; | |
537 | } | |
538 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
539 | if (!devpath_string) { | |
540 | error = -ENOMEM; | |
541 | goto out; | |
542 | } | |
543 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
544 | envp[0] = devpath_string; | |
545 | envp[1] = NULL; | |
e34ff490 | 546 | error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj)); |
8a82472f CH |
547 | if (error) |
548 | goto out; | |
549 | old_parent = kobj->parent; | |
550 | kobj->parent = new_parent; | |
9e993efb | 551 | new_parent = NULL; |
8a82472f CH |
552 | kobject_put(old_parent); |
553 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); | |
554 | out: | |
9e993efb | 555 | kobject_put(new_parent); |
8a82472f CH |
556 | kobject_put(kobj); |
557 | kfree(devpath_string); | |
558 | kfree(devpath); | |
559 | return error; | |
560 | } | |
24199d20 | 561 | EXPORT_SYMBOL_GPL(kobject_move); |
8a82472f | 562 | |
1da177e4 | 563 | /** |
e374a2bf GKH |
564 | * kobject_del - unlink kobject from hierarchy. |
565 | * @kobj: object. | |
1da177e4 | 566 | */ |
e374a2bf | 567 | void kobject_del(struct kobject *kobj) |
1da177e4 | 568 | { |
324a56e1 | 569 | struct kernfs_node *sd; |
26ea12de | 570 | |
31b9025a GKH |
571 | if (!kobj) |
572 | return; | |
0f4dafc0 | 573 | |
26ea12de | 574 | sd = kobj->sd; |
1da177e4 | 575 | sysfs_remove_dir(kobj); |
26ea12de TH |
576 | sysfs_put(sd); |
577 | ||
0f4dafc0 KS |
578 | kobj->state_in_sysfs = 0; |
579 | kobj_kset_leave(kobj); | |
580 | kobject_put(kobj->parent); | |
581 | kobj->parent = NULL; | |
1da177e4 | 582 | } |
fa40ae34 | 583 | EXPORT_SYMBOL(kobject_del); |
1da177e4 | 584 | |
1da177e4 | 585 | /** |
e374a2bf GKH |
586 | * kobject_get - increment refcount for object. |
587 | * @kobj: object. | |
1da177e4 | 588 | */ |
e374a2bf | 589 | struct kobject *kobject_get(struct kobject *kobj) |
1da177e4 | 590 | { |
d82d54af EZ |
591 | if (kobj) { |
592 | if (!kobj->state_initialized) | |
593 | WARN(1, KERN_WARNING "kobject: '%s' (%p): is not " | |
594 | "initialized, yet kobject_get() is being " | |
595 | "called.\n", kobject_name(kobj), kobj); | |
1da177e4 | 596 | kref_get(&kobj->kref); |
d82d54af | 597 | } |
1da177e4 LT |
598 | return kobj; |
599 | } | |
fa40ae34 | 600 | EXPORT_SYMBOL(kobject_get); |
1da177e4 | 601 | |
c70c176f | 602 | struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj) |
a49b7e82 | 603 | { |
c70c176f JK |
604 | if (!kobj) |
605 | return NULL; | |
a49b7e82 LT |
606 | if (!kref_get_unless_zero(&kobj->kref)) |
607 | kobj = NULL; | |
608 | return kobj; | |
609 | } | |
c70c176f | 610 | EXPORT_SYMBOL(kobject_get_unless_zero); |
a49b7e82 | 611 | |
18041f47 GKH |
612 | /* |
613 | * kobject_cleanup - free kobject resources. | |
614 | * @kobj: object to cleanup | |
1da177e4 | 615 | */ |
18041f47 | 616 | static void kobject_cleanup(struct kobject *kobj) |
1da177e4 | 617 | { |
0f4dafc0 | 618 | struct kobj_type *t = get_ktype(kobj); |
af5ca3f4 | 619 | const char *name = kobj->name; |
1da177e4 | 620 | |
c817a67e RK |
621 | pr_debug("kobject: '%s' (%p): %s, parent %p\n", |
622 | kobject_name(kobj), kobj, __func__, kobj->parent); | |
0f4dafc0 KS |
623 | |
624 | if (t && !t->release) | |
625 | pr_debug("kobject: '%s' (%p): does not have a release() " | |
626 | "function, it is broken and must be fixed.\n", | |
627 | kobject_name(kobj), kobj); | |
628 | ||
629 | /* send "remove" if the caller did not do it but sent "add" */ | |
630 | if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) { | |
631 | pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n", | |
632 | kobject_name(kobj), kobj); | |
633 | kobject_uevent(kobj, KOBJ_REMOVE); | |
634 | } | |
635 | ||
636 | /* remove from sysfs if the caller did not do it */ | |
637 | if (kobj->state_in_sysfs) { | |
638 | pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n", | |
639 | kobject_name(kobj), kobj); | |
640 | kobject_del(kobj); | |
641 | } | |
642 | ||
ce2c9cb0 | 643 | if (t && t->release) { |
0f4dafc0 KS |
644 | pr_debug("kobject: '%s' (%p): calling ktype release\n", |
645 | kobject_name(kobj), kobj); | |
1da177e4 | 646 | t->release(kobj); |
0f4dafc0 KS |
647 | } |
648 | ||
649 | /* free name if we allocated it */ | |
af5ca3f4 | 650 | if (name) { |
0f4dafc0 | 651 | pr_debug("kobject: '%s': free name\n", name); |
f773f32d | 652 | kfree_const(name); |
ce2c9cb0 | 653 | } |
1da177e4 LT |
654 | } |
655 | ||
c817a67e RK |
656 | #ifdef CONFIG_DEBUG_KOBJECT_RELEASE |
657 | static void kobject_delayed_cleanup(struct work_struct *work) | |
658 | { | |
659 | kobject_cleanup(container_of(to_delayed_work(work), | |
660 | struct kobject, release)); | |
661 | } | |
662 | #endif | |
663 | ||
1da177e4 LT |
664 | static void kobject_release(struct kref *kref) |
665 | { | |
c817a67e RK |
666 | struct kobject *kobj = container_of(kref, struct kobject, kref); |
667 | #ifdef CONFIG_DEBUG_KOBJECT_RELEASE | |
89c86a64 BH |
668 | unsigned long delay = HZ + HZ * (get_random_int() & 0x3); |
669 | pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n", | |
670 | kobject_name(kobj), kobj, __func__, kobj->parent, delay); | |
c817a67e | 671 | INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup); |
89c86a64 BH |
672 | |
673 | schedule_delayed_work(&kobj->release, delay); | |
c817a67e RK |
674 | #else |
675 | kobject_cleanup(kobj); | |
676 | #endif | |
1da177e4 LT |
677 | } |
678 | ||
679 | /** | |
e374a2bf GKH |
680 | * kobject_put - decrement refcount for object. |
681 | * @kobj: object. | |
1da177e4 | 682 | * |
e374a2bf | 683 | * Decrement the refcount, and if 0, call kobject_cleanup(). |
1da177e4 | 684 | */ |
e374a2bf | 685 | void kobject_put(struct kobject *kobj) |
1da177e4 | 686 | { |
c1ebdae5 | 687 | if (kobj) { |
d955c78a AV |
688 | if (!kobj->state_initialized) |
689 | WARN(1, KERN_WARNING "kobject: '%s' (%p): is not " | |
c1ebdae5 GKH |
690 | "initialized, yet kobject_put() is being " |
691 | "called.\n", kobject_name(kobj), kobj); | |
1da177e4 | 692 | kref_put(&kobj->kref, kobject_release); |
c1ebdae5 | 693 | } |
1da177e4 | 694 | } |
fa40ae34 | 695 | EXPORT_SYMBOL(kobject_put); |
1da177e4 | 696 | |
3f9e3ee9 | 697 | static void dynamic_kobj_release(struct kobject *kobj) |
7423172a | 698 | { |
810304db | 699 | pr_debug("kobject: (%p): %s\n", kobj, __func__); |
7423172a JN |
700 | kfree(kobj); |
701 | } | |
702 | ||
3f9e3ee9 | 703 | static struct kobj_type dynamic_kobj_ktype = { |
386f275f KS |
704 | .release = dynamic_kobj_release, |
705 | .sysfs_ops = &kobj_sysfs_ops, | |
7423172a JN |
706 | }; |
707 | ||
43968d2f | 708 | /** |
3f9e3ee9 GKH |
709 | * kobject_create - create a struct kobject dynamically |
710 | * | |
711 | * This function creates a kobject structure dynamically and sets it up | |
712 | * to be a "dynamic" kobject with a default release function set up. | |
713 | * | |
714 | * If the kobject was not able to be created, NULL will be returned. | |
43968d2f | 715 | * The kobject structure returned from here must be cleaned up with a |
f9cb074b | 716 | * call to kobject_put() and not kfree(), as kobject_init() has |
43968d2f | 717 | * already been called on this structure. |
3f9e3ee9 | 718 | */ |
43968d2f | 719 | struct kobject *kobject_create(void) |
3f9e3ee9 GKH |
720 | { |
721 | struct kobject *kobj; | |
722 | ||
723 | kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); | |
724 | if (!kobj) | |
725 | return NULL; | |
726 | ||
f9cb074b | 727 | kobject_init(kobj, &dynamic_kobj_ktype); |
3f9e3ee9 GKH |
728 | return kobj; |
729 | } | |
730 | ||
731 | /** | |
732 | * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs | |
733 | * | |
9ff1f838 | 734 | * @name: the name for the kobject |
3f9e3ee9 GKH |
735 | * @parent: the parent kobject of this kobject, if any. |
736 | * | |
f70701a3 | 737 | * This function creates a kobject structure dynamically and registers it |
3f9e3ee9 | 738 | * with sysfs. When you are finished with this structure, call |
78a2d906 | 739 | * kobject_put() and the structure will be dynamically freed when |
3f9e3ee9 GKH |
740 | * it is no longer being used. |
741 | * | |
742 | * If the kobject was not able to be created, NULL will be returned. | |
743 | */ | |
744 | struct kobject *kobject_create_and_add(const char *name, struct kobject *parent) | |
745 | { | |
746 | struct kobject *kobj; | |
747 | int retval; | |
748 | ||
749 | kobj = kobject_create(); | |
750 | if (!kobj) | |
751 | return NULL; | |
752 | ||
b2d6db58 | 753 | retval = kobject_add(kobj, parent, "%s", name); |
3f9e3ee9 GKH |
754 | if (retval) { |
755 | printk(KERN_WARNING "%s: kobject_add error: %d\n", | |
810304db | 756 | __func__, retval); |
3f9e3ee9 GKH |
757 | kobject_put(kobj); |
758 | kobj = NULL; | |
759 | } | |
760 | return kobj; | |
761 | } | |
762 | EXPORT_SYMBOL_GPL(kobject_create_and_add); | |
763 | ||
1da177e4 | 764 | /** |
e374a2bf GKH |
765 | * kset_init - initialize a kset for use |
766 | * @k: kset | |
1da177e4 | 767 | */ |
e374a2bf | 768 | void kset_init(struct kset *k) |
1da177e4 | 769 | { |
e1543ddf | 770 | kobject_init_internal(&k->kobj); |
1da177e4 LT |
771 | INIT_LIST_HEAD(&k->list); |
772 | spin_lock_init(&k->list_lock); | |
773 | } | |
774 | ||
23b5212c KS |
775 | /* default kobject attribute operations */ |
776 | static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr, | |
777 | char *buf) | |
778 | { | |
779 | struct kobj_attribute *kattr; | |
780 | ssize_t ret = -EIO; | |
781 | ||
782 | kattr = container_of(attr, struct kobj_attribute, attr); | |
783 | if (kattr->show) | |
784 | ret = kattr->show(kobj, kattr, buf); | |
785 | return ret; | |
786 | } | |
787 | ||
788 | static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr, | |
789 | const char *buf, size_t count) | |
790 | { | |
791 | struct kobj_attribute *kattr; | |
792 | ssize_t ret = -EIO; | |
793 | ||
794 | kattr = container_of(attr, struct kobj_attribute, attr); | |
795 | if (kattr->store) | |
796 | ret = kattr->store(kobj, kattr, buf, count); | |
797 | return ret; | |
798 | } | |
799 | ||
52cf25d0 | 800 | const struct sysfs_ops kobj_sysfs_ops = { |
23b5212c KS |
801 | .show = kobj_attr_show, |
802 | .store = kobj_attr_store, | |
803 | }; | |
29dfe2dc | 804 | EXPORT_SYMBOL_GPL(kobj_sysfs_ops); |
1da177e4 | 805 | |
1da177e4 | 806 | /** |
e374a2bf GKH |
807 | * kset_register - initialize and add a kset. |
808 | * @k: kset. | |
1da177e4 | 809 | */ |
e374a2bf | 810 | int kset_register(struct kset *k) |
1da177e4 | 811 | { |
80f03e34 KS |
812 | int err; |
813 | ||
31b9025a GKH |
814 | if (!k) |
815 | return -EINVAL; | |
80f03e34 | 816 | |
1da177e4 | 817 | kset_init(k); |
12e339ac | 818 | err = kobject_add_internal(&k->kobj); |
80f03e34 KS |
819 | if (err) |
820 | return err; | |
821 | kobject_uevent(&k->kobj, KOBJ_ADD); | |
822 | return 0; | |
1da177e4 | 823 | } |
fa40ae34 | 824 | EXPORT_SYMBOL(kset_register); |
1da177e4 | 825 | |
1da177e4 | 826 | /** |
e374a2bf GKH |
827 | * kset_unregister - remove a kset. |
828 | * @k: kset. | |
1da177e4 | 829 | */ |
e374a2bf | 830 | void kset_unregister(struct kset *k) |
1da177e4 | 831 | { |
31b9025a GKH |
832 | if (!k) |
833 | return; | |
35a5fe69 | 834 | kobject_del(&k->kobj); |
78a2d906 | 835 | kobject_put(&k->kobj); |
1da177e4 | 836 | } |
fa40ae34 | 837 | EXPORT_SYMBOL(kset_unregister); |
1da177e4 | 838 | |
1da177e4 | 839 | /** |
e374a2bf GKH |
840 | * kset_find_obj - search for object in kset. |
841 | * @kset: kset we're looking in. | |
842 | * @name: object's name. | |
1da177e4 | 843 | * |
e374a2bf GKH |
844 | * Lock kset via @kset->subsys, and iterate over @kset->list, |
845 | * looking for a matching kobject. If matching object is found | |
846 | * take a reference and return the object. | |
1da177e4 | 847 | */ |
e374a2bf | 848 | struct kobject *kset_find_obj(struct kset *kset, const char *name) |
1da177e4 | 849 | { |
c6a2a3dc | 850 | struct kobject *k; |
e374a2bf | 851 | struct kobject *ret = NULL; |
1da177e4 LT |
852 | |
853 | spin_lock(&kset->list_lock); | |
c25d1dfb | 854 | |
c6a2a3dc | 855 | list_for_each_entry(k, &kset->list, entry) { |
e374a2bf | 856 | if (kobject_name(k) && !strcmp(kobject_name(k), name)) { |
a49b7e82 | 857 | ret = kobject_get_unless_zero(k); |
1da177e4 LT |
858 | break; |
859 | } | |
860 | } | |
c25d1dfb | 861 | |
1da177e4 LT |
862 | spin_unlock(&kset->list_lock); |
863 | return ret; | |
864 | } | |
2fe829ac | 865 | EXPORT_SYMBOL_GPL(kset_find_obj); |
1da177e4 | 866 | |
b727c702 GKH |
867 | static void kset_release(struct kobject *kobj) |
868 | { | |
869 | struct kset *kset = container_of(kobj, struct kset, kobj); | |
9f66fa2a | 870 | pr_debug("kobject: '%s' (%p): %s\n", |
810304db | 871 | kobject_name(kobj), kobj, __func__); |
b727c702 GKH |
872 | kfree(kset); |
873 | } | |
874 | ||
386f275f KS |
875 | static struct kobj_type kset_ktype = { |
876 | .sysfs_ops = &kobj_sysfs_ops, | |
b727c702 GKH |
877 | .release = kset_release, |
878 | }; | |
879 | ||
880 | /** | |
881 | * kset_create - create a struct kset dynamically | |
882 | * | |
883 | * @name: the name for the kset | |
884 | * @uevent_ops: a struct kset_uevent_ops for the kset | |
885 | * @parent_kobj: the parent kobject of this kset, if any. | |
886 | * | |
887 | * This function creates a kset structure dynamically. This structure can | |
888 | * then be registered with the system and show up in sysfs with a call to | |
889 | * kset_register(). When you are finished with this structure, if | |
890 | * kset_register() has been called, call kset_unregister() and the | |
891 | * structure will be dynamically freed when it is no longer being used. | |
892 | * | |
893 | * If the kset was not able to be created, NULL will be returned. | |
894 | */ | |
895 | static struct kset *kset_create(const char *name, | |
9cd43611 | 896 | const struct kset_uevent_ops *uevent_ops, |
b727c702 GKH |
897 | struct kobject *parent_kobj) |
898 | { | |
899 | struct kset *kset; | |
d9cd8f37 | 900 | int retval; |
b727c702 GKH |
901 | |
902 | kset = kzalloc(sizeof(*kset), GFP_KERNEL); | |
903 | if (!kset) | |
904 | return NULL; | |
b7165ebb | 905 | retval = kobject_set_name(&kset->kobj, "%s", name); |
d9cd8f37 DY |
906 | if (retval) { |
907 | kfree(kset); | |
908 | return NULL; | |
909 | } | |
b727c702 GKH |
910 | kset->uevent_ops = uevent_ops; |
911 | kset->kobj.parent = parent_kobj; | |
912 | ||
913 | /* | |
386f275f | 914 | * The kobject of this kset will have a type of kset_ktype and belong to |
b727c702 GKH |
915 | * no kset itself. That way we can properly free it when it is |
916 | * finished being used. | |
917 | */ | |
386f275f | 918 | kset->kobj.ktype = &kset_ktype; |
b727c702 GKH |
919 | kset->kobj.kset = NULL; |
920 | ||
921 | return kset; | |
922 | } | |
923 | ||
924 | /** | |
925 | * kset_create_and_add - create a struct kset dynamically and add it to sysfs | |
926 | * | |
927 | * @name: the name for the kset | |
928 | * @uevent_ops: a struct kset_uevent_ops for the kset | |
929 | * @parent_kobj: the parent kobject of this kset, if any. | |
930 | * | |
931 | * This function creates a kset structure dynamically and registers it | |
932 | * with sysfs. When you are finished with this structure, call | |
933 | * kset_unregister() and the structure will be dynamically freed when it | |
934 | * is no longer being used. | |
935 | * | |
936 | * If the kset was not able to be created, NULL will be returned. | |
937 | */ | |
938 | struct kset *kset_create_and_add(const char *name, | |
9cd43611 | 939 | const struct kset_uevent_ops *uevent_ops, |
b727c702 GKH |
940 | struct kobject *parent_kobj) |
941 | { | |
942 | struct kset *kset; | |
943 | int error; | |
944 | ||
945 | kset = kset_create(name, uevent_ops, parent_kobj); | |
946 | if (!kset) | |
947 | return NULL; | |
948 | error = kset_register(kset); | |
949 | if (error) { | |
950 | kfree(kset); | |
951 | return NULL; | |
952 | } | |
953 | return kset; | |
954 | } | |
955 | EXPORT_SYMBOL_GPL(kset_create_and_add); | |
956 | ||
bc451f20 EB |
957 | |
958 | static DEFINE_SPINLOCK(kobj_ns_type_lock); | |
959 | static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES]; | |
960 | ||
961 | int kobj_ns_type_register(const struct kobj_ns_type_operations *ops) | |
962 | { | |
963 | enum kobj_ns_type type = ops->type; | |
964 | int error; | |
965 | ||
966 | spin_lock(&kobj_ns_type_lock); | |
967 | ||
968 | error = -EINVAL; | |
969 | if (type >= KOBJ_NS_TYPES) | |
970 | goto out; | |
971 | ||
972 | error = -EINVAL; | |
973 | if (type <= KOBJ_NS_TYPE_NONE) | |
974 | goto out; | |
975 | ||
976 | error = -EBUSY; | |
977 | if (kobj_ns_ops_tbl[type]) | |
978 | goto out; | |
979 | ||
980 | error = 0; | |
981 | kobj_ns_ops_tbl[type] = ops; | |
982 | ||
983 | out: | |
984 | spin_unlock(&kobj_ns_type_lock); | |
985 | return error; | |
986 | } | |
987 | ||
988 | int kobj_ns_type_registered(enum kobj_ns_type type) | |
989 | { | |
990 | int registered = 0; | |
991 | ||
992 | spin_lock(&kobj_ns_type_lock); | |
993 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES)) | |
994 | registered = kobj_ns_ops_tbl[type] != NULL; | |
995 | spin_unlock(&kobj_ns_type_lock); | |
996 | ||
997 | return registered; | |
998 | } | |
999 | ||
1000 | const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent) | |
1001 | { | |
1002 | const struct kobj_ns_type_operations *ops = NULL; | |
1003 | ||
41fb96a4 | 1004 | if (parent && parent->ktype && parent->ktype->child_ns_type) |
bc451f20 EB |
1005 | ops = parent->ktype->child_ns_type(parent); |
1006 | ||
1007 | return ops; | |
1008 | } | |
1009 | ||
1010 | const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj) | |
1011 | { | |
1012 | return kobj_child_ns_ops(kobj->parent); | |
1013 | } | |
1014 | ||
7dc5dbc8 EB |
1015 | bool kobj_ns_current_may_mount(enum kobj_ns_type type) |
1016 | { | |
730d7d33 | 1017 | bool may_mount = true; |
7dc5dbc8 EB |
1018 | |
1019 | spin_lock(&kobj_ns_type_lock); | |
1020 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1021 | kobj_ns_ops_tbl[type]) | |
1022 | may_mount = kobj_ns_ops_tbl[type]->current_may_mount(); | |
1023 | spin_unlock(&kobj_ns_type_lock); | |
1024 | ||
1025 | return may_mount; | |
1026 | } | |
bc451f20 | 1027 | |
a685e089 | 1028 | void *kobj_ns_grab_current(enum kobj_ns_type type) |
bc451f20 | 1029 | { |
a685e089 | 1030 | void *ns = NULL; |
bc451f20 EB |
1031 | |
1032 | spin_lock(&kobj_ns_type_lock); | |
1033 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1034 | kobj_ns_ops_tbl[type]) | |
a685e089 | 1035 | ns = kobj_ns_ops_tbl[type]->grab_current_ns(); |
bc451f20 EB |
1036 | spin_unlock(&kobj_ns_type_lock); |
1037 | ||
1038 | return ns; | |
1039 | } | |
1040 | ||
1041 | const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk) | |
1042 | { | |
1043 | const void *ns = NULL; | |
1044 | ||
1045 | spin_lock(&kobj_ns_type_lock); | |
1046 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1047 | kobj_ns_ops_tbl[type]) | |
1048 | ns = kobj_ns_ops_tbl[type]->netlink_ns(sk); | |
1049 | spin_unlock(&kobj_ns_type_lock); | |
1050 | ||
1051 | return ns; | |
1052 | } | |
1053 | ||
1054 | const void *kobj_ns_initial(enum kobj_ns_type type) | |
1055 | { | |
1056 | const void *ns = NULL; | |
1057 | ||
1058 | spin_lock(&kobj_ns_type_lock); | |
1059 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1060 | kobj_ns_ops_tbl[type]) | |
1061 | ns = kobj_ns_ops_tbl[type]->initial_ns(); | |
1062 | spin_unlock(&kobj_ns_type_lock); | |
1063 | ||
1064 | return ns; | |
1065 | } | |
1066 | ||
a685e089 | 1067 | void kobj_ns_drop(enum kobj_ns_type type, void *ns) |
bc451f20 | 1068 | { |
a685e089 AV |
1069 | spin_lock(&kobj_ns_type_lock); |
1070 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1071 | kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns) | |
1072 | kobj_ns_ops_tbl[type]->drop_ns(ns); | |
1073 | spin_unlock(&kobj_ns_type_lock); | |
bc451f20 | 1074 | } |