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> | |
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> |
89c86a64 | 21 | #include <linux/random.h> |
1da177e4 | 22 | |
e34ff490 TH |
23 | /** |
24 | * kobject_namespace - return @kobj's namespace tag | |
25 | * @kobj: kobject in question | |
26 | * | |
27 | * Returns namespace tag of @kobj if its parent has namespace ops enabled | |
28 | * and thus @kobj should have a namespace tag associated with it. Returns | |
29 | * %NULL otherwise. | |
30 | */ | |
31 | const void *kobject_namespace(struct kobject *kobj) | |
32 | { | |
33 | const struct kobj_ns_type_operations *ns_ops = kobj_ns_ops(kobj); | |
34 | ||
35 | if (!ns_ops || ns_ops->type == KOBJ_NS_TYPE_NONE) | |
36 | return NULL; | |
37 | ||
a1212d27 | 38 | return kobj->ktype->namespace(kobj); |
e34ff490 TH |
39 | } |
40 | ||
e374a2bf GKH |
41 | /* |
42 | * populate_dir - populate directory with attributes. | |
43 | * @kobj: object we're working on. | |
1da177e4 | 44 | * |
e374a2bf GKH |
45 | * Most subsystems have a set of default attributes that are associated |
46 | * with an object that registers with them. This is a helper called during | |
47 | * object registration that loops through the default attributes of the | |
48 | * subsystem and creates attributes files for them in sysfs. | |
1da177e4 | 49 | */ |
e374a2bf | 50 | static int populate_dir(struct kobject *kobj) |
1da177e4 | 51 | { |
e374a2bf GKH |
52 | struct kobj_type *t = get_ktype(kobj); |
53 | struct attribute *attr; | |
1da177e4 LT |
54 | int error = 0; |
55 | int i; | |
e374a2bf | 56 | |
1da177e4 LT |
57 | if (t && t->default_attrs) { |
58 | for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) { | |
e374a2bf GKH |
59 | error = sysfs_create_file(kobj, attr); |
60 | if (error) | |
1da177e4 LT |
61 | break; |
62 | } | |
63 | } | |
64 | return error; | |
65 | } | |
66 | ||
e374a2bf | 67 | static int create_dir(struct kobject *kobj) |
1da177e4 | 68 | { |
c84a3b27 | 69 | const struct kobj_ns_type_operations *ops; |
e34ff490 TH |
70 | int error; |
71 | ||
72 | error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj)); | |
c84a3b27 TH |
73 | if (error) |
74 | return error; | |
75 | ||
76 | error = populate_dir(kobj); | |
77 | if (error) { | |
78 | sysfs_remove_dir(kobj); | |
79 | return error; | |
1da177e4 | 80 | } |
26ea12de TH |
81 | |
82 | /* | |
83 | * @kobj->sd may be deleted by an ancestor going away. Hold an | |
84 | * extra reference so that it stays until @kobj is gone. | |
85 | */ | |
86 | sysfs_get(kobj->sd); | |
87 | ||
c84a3b27 TH |
88 | /* |
89 | * If @kobj has ns_ops, its children need to be filtered based on | |
90 | * their namespace tags. Enable namespace support on @kobj->sd. | |
91 | */ | |
92 | ops = kobj_child_ns_ops(kobj); | |
93 | if (ops) { | |
94 | BUG_ON(ops->type <= KOBJ_NS_TYPE_NONE); | |
95 | BUG_ON(ops->type >= KOBJ_NS_TYPES); | |
96 | BUG_ON(!kobj_ns_type_registered(ops->type)); | |
97 | ||
93b2b8e4 | 98 | kernfs_enable_ns(kobj->sd); |
c84a3b27 TH |
99 | } |
100 | ||
101 | return 0; | |
1da177e4 LT |
102 | } |
103 | ||
1da177e4 LT |
104 | static int get_kobj_path_length(struct kobject *kobj) |
105 | { | |
106 | int length = 1; | |
e374a2bf | 107 | struct kobject *parent = kobj; |
1da177e4 | 108 | |
e374a2bf | 109 | /* walk up the ancestors until we hit the one pointing to the |
1da177e4 LT |
110 | * root. |
111 | * Add 1 to strlen for leading '/' of each level. | |
112 | */ | |
113 | do { | |
b365b3da CE |
114 | if (kobject_name(parent) == NULL) |
115 | return 0; | |
1da177e4 LT |
116 | length += strlen(kobject_name(parent)) + 1; |
117 | parent = parent->parent; | |
118 | } while (parent); | |
119 | return length; | |
120 | } | |
121 | ||
122 | static void fill_kobj_path(struct kobject *kobj, char *path, int length) | |
123 | { | |
e374a2bf | 124 | struct kobject *parent; |
1da177e4 LT |
125 | |
126 | --length; | |
127 | for (parent = kobj; parent; parent = parent->parent) { | |
128 | int cur = strlen(kobject_name(parent)); | |
129 | /* back up enough to print this name with '/' */ | |
130 | length -= cur; | |
e374a2bf | 131 | strncpy(path + length, kobject_name(parent), cur); |
1da177e4 LT |
132 | *(path + --length) = '/'; |
133 | } | |
134 | ||
9f66fa2a | 135 | pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj), |
810304db | 136 | kobj, __func__, path); |
1da177e4 LT |
137 | } |
138 | ||
139 | /** | |
72fd4a35 | 140 | * kobject_get_path - generate and return the path associated with a given kobj and kset pair. |
1da177e4 LT |
141 | * |
142 | * @kobj: kobject in question, with which to build the path | |
143 | * @gfp_mask: the allocation type used to allocate the path | |
72fd4a35 RD |
144 | * |
145 | * The result must be freed by the caller with kfree(). | |
1da177e4 | 146 | */ |
fd4f2df2 | 147 | char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask) |
1da177e4 LT |
148 | { |
149 | char *path; | |
150 | int len; | |
151 | ||
152 | len = get_kobj_path_length(kobj); | |
b365b3da CE |
153 | if (len == 0) |
154 | return NULL; | |
4668edc3 | 155 | path = kzalloc(len, gfp_mask); |
1da177e4 LT |
156 | if (!path) |
157 | return NULL; | |
1da177e4 LT |
158 | fill_kobj_path(kobj, path, len); |
159 | ||
160 | return path; | |
161 | } | |
80fc9f53 | 162 | EXPORT_SYMBOL_GPL(kobject_get_path); |
1da177e4 | 163 | |
0f4dafc0 KS |
164 | /* add the kobject to its kset's list */ |
165 | static void kobj_kset_join(struct kobject *kobj) | |
1da177e4 | 166 | { |
0f4dafc0 | 167 | if (!kobj->kset) |
31b9025a | 168 | return; |
0f4dafc0 KS |
169 | |
170 | kset_get(kobj->kset); | |
171 | spin_lock(&kobj->kset->list_lock); | |
172 | list_add_tail(&kobj->entry, &kobj->kset->list); | |
173 | spin_unlock(&kobj->kset->list_lock); | |
1da177e4 LT |
174 | } |
175 | ||
0f4dafc0 KS |
176 | /* remove the kobject from its kset's list */ |
177 | static void kobj_kset_leave(struct kobject *kobj) | |
178 | { | |
179 | if (!kobj->kset) | |
180 | return; | |
1da177e4 | 181 | |
0f4dafc0 KS |
182 | spin_lock(&kobj->kset->list_lock); |
183 | list_del_init(&kobj->entry); | |
184 | spin_unlock(&kobj->kset->list_lock); | |
185 | kset_put(kobj->kset); | |
186 | } | |
1da177e4 | 187 | |
e374a2bf | 188 | static void kobject_init_internal(struct kobject *kobj) |
1da177e4 | 189 | { |
0f4dafc0 KS |
190 | if (!kobj) |
191 | return; | |
192 | kref_init(&kobj->kref); | |
193 | INIT_LIST_HEAD(&kobj->entry); | |
a4573c48 GKH |
194 | kobj->state_in_sysfs = 0; |
195 | kobj->state_add_uevent_sent = 0; | |
196 | kobj->state_remove_uevent_sent = 0; | |
197 | kobj->state_initialized = 1; | |
1da177e4 LT |
198 | } |
199 | ||
0f4dafc0 | 200 | |
9e7bbccd | 201 | static int kobject_add_internal(struct kobject *kobj) |
1da177e4 LT |
202 | { |
203 | int error = 0; | |
e374a2bf | 204 | struct kobject *parent; |
1da177e4 | 205 | |
0f4dafc0 | 206 | if (!kobj) |
1da177e4 | 207 | return -ENOENT; |
0f4dafc0 | 208 | |
af5ca3f4 | 209 | if (!kobj->name || !kobj->name[0]) { |
d955c78a | 210 | WARN(1, "kobject: (%p): attempted to be registered with empty " |
9f66fa2a | 211 | "name!\n", kobj); |
c171fef5 GKH |
212 | return -EINVAL; |
213 | } | |
1da177e4 | 214 | |
0f4dafc0 | 215 | parent = kobject_get(kobj->parent); |
1da177e4 | 216 | |
0f4dafc0 | 217 | /* join kset if set, use it as parent if we do not already have one */ |
1da177e4 | 218 | if (kobj->kset) { |
0f4dafc0 | 219 | if (!parent) |
1da177e4 | 220 | parent = kobject_get(&kobj->kset->kobj); |
0f4dafc0 | 221 | kobj_kset_join(kobj); |
460f7e9a | 222 | kobj->parent = parent; |
1da177e4 | 223 | } |
1da177e4 | 224 | |
0f4dafc0 | 225 | pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n", |
810304db | 226 | kobject_name(kobj), kobj, __func__, |
0f4dafc0 | 227 | parent ? kobject_name(parent) : "<NULL>", |
e374a2bf | 228 | kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>"); |
0f4dafc0 | 229 | |
90bc6135 | 230 | error = create_dir(kobj); |
1da177e4 | 231 | if (error) { |
0f4dafc0 KS |
232 | kobj_kset_leave(kobj); |
233 | kobject_put(parent); | |
234 | kobj->parent = NULL; | |
dcd0da00 GKH |
235 | |
236 | /* be noisy on error issues */ | |
237 | if (error == -EEXIST) | |
282029c0 DW |
238 | WARN(1, "%s failed for %s with " |
239 | "-EEXIST, don't try to register things with " | |
240 | "the same name in the same directory.\n", | |
241 | __func__, kobject_name(kobj)); | |
dcd0da00 | 242 | else |
282029c0 DW |
243 | WARN(1, "%s failed for %s (error: %d parent: %s)\n", |
244 | __func__, kobject_name(kobj), error, | |
245 | parent ? kobject_name(parent) : "'none'"); | |
0f4dafc0 KS |
246 | } else |
247 | kobj->state_in_sysfs = 1; | |
1da177e4 LT |
248 | |
249 | return error; | |
250 | } | |
251 | ||
663a4743 GKH |
252 | /** |
253 | * kobject_set_name_vargs - Set the name of an kobject | |
254 | * @kobj: struct kobject to set the name of | |
255 | * @fmt: format string used to build the name | |
256 | * @vargs: vargs to format the string. | |
257 | */ | |
1fa5ae85 | 258 | int kobject_set_name_vargs(struct kobject *kobj, const char *fmt, |
663a4743 GKH |
259 | va_list vargs) |
260 | { | |
9f255651 KS |
261 | const char *old_name = kobj->name; |
262 | char *s; | |
663a4743 | 263 | |
8a577ffc KS |
264 | if (kobj->name && !fmt) |
265 | return 0; | |
266 | ||
a4ca6617 | 267 | kobj->name = kvasprintf(GFP_KERNEL, fmt, vargs); |
020d30f1 ML |
268 | if (!kobj->name) { |
269 | kobj->name = old_name; | |
a4ca6617 | 270 | return -ENOMEM; |
020d30f1 | 271 | } |
663a4743 | 272 | |
9f255651 | 273 | /* ewww... some of these buggers have '/' in the name ... */ |
25fdeb3f | 274 | while ((s = strchr(kobj->name, '/'))) |
9f255651 KS |
275 | s[0] = '!'; |
276 | ||
277 | kfree(old_name); | |
663a4743 GKH |
278 | return 0; |
279 | } | |
1da177e4 LT |
280 | |
281 | /** | |
8c4606b1 | 282 | * kobject_set_name - Set the name of a kobject |
663a4743 | 283 | * @kobj: struct kobject to set the name of |
8c4606b1 | 284 | * @fmt: format string used to build the name |
1da177e4 | 285 | * |
8c4606b1 GKH |
286 | * This sets the name of the kobject. If you have already added the |
287 | * kobject to the system, you must call kobject_rename() in order to | |
288 | * change the name of the kobject. | |
1da177e4 | 289 | */ |
663a4743 | 290 | int kobject_set_name(struct kobject *kobj, const char *fmt, ...) |
1da177e4 | 291 | { |
a4ca6617 | 292 | va_list vargs; |
663a4743 | 293 | int retval; |
1da177e4 | 294 | |
a4ca6617 KS |
295 | va_start(vargs, fmt); |
296 | retval = kobject_set_name_vargs(kobj, fmt, vargs); | |
297 | va_end(vargs); | |
1da177e4 | 298 | |
663a4743 | 299 | return retval; |
1da177e4 | 300 | } |
1da177e4 LT |
301 | EXPORT_SYMBOL(kobject_set_name); |
302 | ||
e86000d0 | 303 | /** |
f9cb074b | 304 | * kobject_init - initialize a kobject structure |
e86000d0 GKH |
305 | * @kobj: pointer to the kobject to initialize |
306 | * @ktype: pointer to the ktype for this kobject. | |
307 | * | |
308 | * This function will properly initialize a kobject such that it can then | |
309 | * be passed to the kobject_add() call. | |
310 | * | |
311 | * After this function is called, the kobject MUST be cleaned up by a call | |
312 | * to kobject_put(), not by a call to kfree directly to ensure that all of | |
313 | * the memory is cleaned up properly. | |
314 | */ | |
f9cb074b | 315 | void kobject_init(struct kobject *kobj, struct kobj_type *ktype) |
e86000d0 GKH |
316 | { |
317 | char *err_str; | |
318 | ||
319 | if (!kobj) { | |
320 | err_str = "invalid kobject pointer!"; | |
321 | goto error; | |
322 | } | |
323 | if (!ktype) { | |
324 | err_str = "must have a ktype to be initialized properly!\n"; | |
325 | goto error; | |
326 | } | |
0f4dafc0 | 327 | if (kobj->state_initialized) { |
e86000d0 | 328 | /* do not error out as sometimes we can recover */ |
0f4dafc0 KS |
329 | printk(KERN_ERR "kobject (%p): tried to init an initialized " |
330 | "object, something is seriously wrong.\n", kobj); | |
e86000d0 GKH |
331 | dump_stack(); |
332 | } | |
333 | ||
a4573c48 | 334 | kobject_init_internal(kobj); |
e86000d0 GKH |
335 | kobj->ktype = ktype; |
336 | return; | |
337 | ||
338 | error: | |
0f4dafc0 | 339 | printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str); |
e86000d0 GKH |
340 | dump_stack(); |
341 | } | |
f9cb074b | 342 | EXPORT_SYMBOL(kobject_init); |
e86000d0 | 343 | |
244f6cee GKH |
344 | static int kobject_add_varg(struct kobject *kobj, struct kobject *parent, |
345 | const char *fmt, va_list vargs) | |
346 | { | |
244f6cee GKH |
347 | int retval; |
348 | ||
a4ca6617 | 349 | retval = kobject_set_name_vargs(kobj, fmt, vargs); |
244f6cee GKH |
350 | if (retval) { |
351 | printk(KERN_ERR "kobject: can not set name properly!\n"); | |
352 | return retval; | |
353 | } | |
354 | kobj->parent = parent; | |
9e7bbccd | 355 | return kobject_add_internal(kobj); |
244f6cee GKH |
356 | } |
357 | ||
358 | /** | |
b2d6db58 | 359 | * kobject_add - the main kobject add function |
244f6cee GKH |
360 | * @kobj: the kobject to add |
361 | * @parent: pointer to the parent of the kobject. | |
362 | * @fmt: format to name the kobject with. | |
363 | * | |
364 | * The kobject name is set and added to the kobject hierarchy in this | |
365 | * function. | |
366 | * | |
367 | * If @parent is set, then the parent of the @kobj will be set to it. | |
368 | * If @parent is NULL, then the parent of the @kobj will be set to the | |
369 | * kobject associted with the kset assigned to this kobject. If no kset | |
370 | * is assigned to the kobject, then the kobject will be located in the | |
371 | * root of the sysfs tree. | |
372 | * | |
373 | * If this function returns an error, kobject_put() must be called to | |
374 | * properly clean up the memory associated with the object. | |
244f6cee GKH |
375 | * Under no instance should the kobject that is passed to this function |
376 | * be directly freed with a call to kfree(), that can leak memory. | |
377 | * | |
0f4dafc0 | 378 | * Note, no "add" uevent will be created with this call, the caller should set |
244f6cee GKH |
379 | * up all of the necessary sysfs files for the object and then call |
380 | * kobject_uevent() with the UEVENT_ADD parameter to ensure that | |
381 | * userspace is properly notified of this kobject's creation. | |
382 | */ | |
b2d6db58 GKH |
383 | int kobject_add(struct kobject *kobj, struct kobject *parent, |
384 | const char *fmt, ...) | |
244f6cee GKH |
385 | { |
386 | va_list args; | |
387 | int retval; | |
388 | ||
389 | if (!kobj) | |
390 | return -EINVAL; | |
391 | ||
0f4dafc0 KS |
392 | if (!kobj->state_initialized) { |
393 | printk(KERN_ERR "kobject '%s' (%p): tried to add an " | |
394 | "uninitialized object, something is seriously wrong.\n", | |
395 | kobject_name(kobj), kobj); | |
396 | dump_stack(); | |
397 | return -EINVAL; | |
398 | } | |
244f6cee GKH |
399 | va_start(args, fmt); |
400 | retval = kobject_add_varg(kobj, parent, fmt, args); | |
401 | va_end(args); | |
402 | ||
403 | return retval; | |
404 | } | |
b2d6db58 | 405 | EXPORT_SYMBOL(kobject_add); |
244f6cee | 406 | |
c11c4154 GKH |
407 | /** |
408 | * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy | |
409 | * @kobj: pointer to the kobject to initialize | |
410 | * @ktype: pointer to the ktype for this kobject. | |
411 | * @parent: pointer to the parent of this kobject. | |
412 | * @fmt: the name of the kobject. | |
413 | * | |
f9cb074b | 414 | * This function combines the call to kobject_init() and |
b2d6db58 GKH |
415 | * kobject_add(). The same type of error handling after a call to |
416 | * kobject_add() and kobject lifetime rules are the same here. | |
c11c4154 GKH |
417 | */ |
418 | int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype, | |
419 | struct kobject *parent, const char *fmt, ...) | |
420 | { | |
421 | va_list args; | |
422 | int retval; | |
423 | ||
f9cb074b | 424 | kobject_init(kobj, ktype); |
c11c4154 GKH |
425 | |
426 | va_start(args, fmt); | |
427 | retval = kobject_add_varg(kobj, parent, fmt, args); | |
428 | va_end(args); | |
429 | ||
430 | return retval; | |
431 | } | |
432 | EXPORT_SYMBOL_GPL(kobject_init_and_add); | |
433 | ||
1da177e4 | 434 | /** |
e374a2bf GKH |
435 | * kobject_rename - change the name of an object |
436 | * @kobj: object in question. | |
437 | * @new_name: object's new name | |
030c1d2b EB |
438 | * |
439 | * It is the responsibility of the caller to provide mutual | |
440 | * exclusion between two different calls of kobject_rename | |
441 | * on the same kobject and to ensure that new_name is valid and | |
442 | * won't conflict with other kobjects. | |
1da177e4 | 443 | */ |
e374a2bf | 444 | int kobject_rename(struct kobject *kobj, const char *new_name) |
1da177e4 LT |
445 | { |
446 | int error = 0; | |
ca2f37db | 447 | const char *devpath = NULL; |
0b4a4fea | 448 | const char *dup_name = NULL, *name; |
ca2f37db JT |
449 | char *devpath_string = NULL; |
450 | char *envp[2]; | |
1da177e4 LT |
451 | |
452 | kobj = kobject_get(kobj); | |
453 | if (!kobj) | |
454 | return -EINVAL; | |
b592fcfe EB |
455 | if (!kobj->parent) |
456 | return -EINVAL; | |
ca2f37db JT |
457 | |
458 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
459 | if (!devpath) { | |
460 | error = -ENOMEM; | |
461 | goto out; | |
462 | } | |
463 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
464 | if (!devpath_string) { | |
465 | error = -ENOMEM; | |
466 | goto out; | |
467 | } | |
468 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
469 | envp[0] = devpath_string; | |
470 | envp[1] = NULL; | |
ca2f37db | 471 | |
0b4a4fea EB |
472 | name = dup_name = kstrdup(new_name, GFP_KERNEL); |
473 | if (!name) { | |
474 | error = -ENOMEM; | |
475 | goto out; | |
476 | } | |
477 | ||
e34ff490 | 478 | error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj)); |
0b4a4fea EB |
479 | if (error) |
480 | goto out; | |
481 | ||
482 | /* Install the new kobject name */ | |
483 | dup_name = kobj->name; | |
484 | kobj->name = name; | |
ca2f37db JT |
485 | |
486 | /* This function is mostly/only used for network interface. | |
487 | * Some hotplug package track interfaces by their name and | |
488 | * therefore want to know when the name is changed by the user. */ | |
0b4a4fea | 489 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); |
ca2f37db JT |
490 | |
491 | out: | |
0b4a4fea | 492 | kfree(dup_name); |
ca2f37db JT |
493 | kfree(devpath_string); |
494 | kfree(devpath); | |
b592fcfe EB |
495 | kobject_put(kobj); |
496 | ||
497 | return error; | |
498 | } | |
8344b568 | 499 | EXPORT_SYMBOL_GPL(kobject_rename); |
b592fcfe | 500 | |
8a82472f | 501 | /** |
e374a2bf GKH |
502 | * kobject_move - move object to another parent |
503 | * @kobj: object in question. | |
504 | * @new_parent: object's new parent (can be NULL) | |
8a82472f | 505 | */ |
8a82472f CH |
506 | int kobject_move(struct kobject *kobj, struct kobject *new_parent) |
507 | { | |
508 | int error; | |
509 | struct kobject *old_parent; | |
510 | const char *devpath = NULL; | |
511 | char *devpath_string = NULL; | |
512 | char *envp[2]; | |
513 | ||
514 | kobj = kobject_get(kobj); | |
515 | if (!kobj) | |
516 | return -EINVAL; | |
517 | new_parent = kobject_get(new_parent); | |
518 | if (!new_parent) { | |
c744aeae CH |
519 | if (kobj->kset) |
520 | new_parent = kobject_get(&kobj->kset->kobj); | |
8a82472f | 521 | } |
e34ff490 | 522 | |
8a82472f CH |
523 | /* old object path */ |
524 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
525 | if (!devpath) { | |
526 | error = -ENOMEM; | |
527 | goto out; | |
528 | } | |
529 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
530 | if (!devpath_string) { | |
531 | error = -ENOMEM; | |
532 | goto out; | |
533 | } | |
534 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
535 | envp[0] = devpath_string; | |
536 | envp[1] = NULL; | |
e34ff490 | 537 | error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj)); |
8a82472f CH |
538 | if (error) |
539 | goto out; | |
540 | old_parent = kobj->parent; | |
541 | kobj->parent = new_parent; | |
9e993efb | 542 | new_parent = NULL; |
8a82472f CH |
543 | kobject_put(old_parent); |
544 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); | |
545 | out: | |
9e993efb | 546 | kobject_put(new_parent); |
8a82472f CH |
547 | kobject_put(kobj); |
548 | kfree(devpath_string); | |
549 | kfree(devpath); | |
550 | return error; | |
551 | } | |
552 | ||
1da177e4 | 553 | /** |
e374a2bf GKH |
554 | * kobject_del - unlink kobject from hierarchy. |
555 | * @kobj: object. | |
1da177e4 | 556 | */ |
e374a2bf | 557 | void kobject_del(struct kobject *kobj) |
1da177e4 | 558 | { |
26ea12de TH |
559 | struct sysfs_dirent *sd; |
560 | ||
31b9025a GKH |
561 | if (!kobj) |
562 | return; | |
0f4dafc0 | 563 | |
26ea12de | 564 | sd = kobj->sd; |
1da177e4 | 565 | sysfs_remove_dir(kobj); |
26ea12de TH |
566 | sysfs_put(sd); |
567 | ||
0f4dafc0 KS |
568 | kobj->state_in_sysfs = 0; |
569 | kobj_kset_leave(kobj); | |
570 | kobject_put(kobj->parent); | |
571 | kobj->parent = NULL; | |
1da177e4 LT |
572 | } |
573 | ||
1da177e4 | 574 | /** |
e374a2bf GKH |
575 | * kobject_get - increment refcount for object. |
576 | * @kobj: object. | |
1da177e4 | 577 | */ |
e374a2bf | 578 | struct kobject *kobject_get(struct kobject *kobj) |
1da177e4 LT |
579 | { |
580 | if (kobj) | |
581 | kref_get(&kobj->kref); | |
582 | return kobj; | |
583 | } | |
584 | ||
2d864e41 | 585 | static struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj) |
a49b7e82 LT |
586 | { |
587 | if (!kref_get_unless_zero(&kobj->kref)) | |
588 | kobj = NULL; | |
589 | return kobj; | |
590 | } | |
591 | ||
18041f47 GKH |
592 | /* |
593 | * kobject_cleanup - free kobject resources. | |
594 | * @kobj: object to cleanup | |
1da177e4 | 595 | */ |
18041f47 | 596 | static void kobject_cleanup(struct kobject *kobj) |
1da177e4 | 597 | { |
0f4dafc0 | 598 | struct kobj_type *t = get_ktype(kobj); |
af5ca3f4 | 599 | const char *name = kobj->name; |
1da177e4 | 600 | |
c817a67e RK |
601 | pr_debug("kobject: '%s' (%p): %s, parent %p\n", |
602 | kobject_name(kobj), kobj, __func__, kobj->parent); | |
0f4dafc0 KS |
603 | |
604 | if (t && !t->release) | |
605 | pr_debug("kobject: '%s' (%p): does not have a release() " | |
606 | "function, it is broken and must be fixed.\n", | |
607 | kobject_name(kobj), kobj); | |
608 | ||
609 | /* send "remove" if the caller did not do it but sent "add" */ | |
610 | if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) { | |
611 | pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n", | |
612 | kobject_name(kobj), kobj); | |
613 | kobject_uevent(kobj, KOBJ_REMOVE); | |
614 | } | |
615 | ||
616 | /* remove from sysfs if the caller did not do it */ | |
617 | if (kobj->state_in_sysfs) { | |
618 | pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n", | |
619 | kobject_name(kobj), kobj); | |
620 | kobject_del(kobj); | |
621 | } | |
622 | ||
ce2c9cb0 | 623 | if (t && t->release) { |
0f4dafc0 KS |
624 | pr_debug("kobject: '%s' (%p): calling ktype release\n", |
625 | kobject_name(kobj), kobj); | |
1da177e4 | 626 | t->release(kobj); |
0f4dafc0 KS |
627 | } |
628 | ||
629 | /* free name if we allocated it */ | |
af5ca3f4 | 630 | if (name) { |
0f4dafc0 | 631 | pr_debug("kobject: '%s': free name\n", name); |
ce2c9cb0 GKH |
632 | kfree(name); |
633 | } | |
1da177e4 LT |
634 | } |
635 | ||
c817a67e RK |
636 | #ifdef CONFIG_DEBUG_KOBJECT_RELEASE |
637 | static void kobject_delayed_cleanup(struct work_struct *work) | |
638 | { | |
639 | kobject_cleanup(container_of(to_delayed_work(work), | |
640 | struct kobject, release)); | |
641 | } | |
642 | #endif | |
643 | ||
1da177e4 LT |
644 | static void kobject_release(struct kref *kref) |
645 | { | |
c817a67e RK |
646 | struct kobject *kobj = container_of(kref, struct kobject, kref); |
647 | #ifdef CONFIG_DEBUG_KOBJECT_RELEASE | |
89c86a64 BH |
648 | unsigned long delay = HZ + HZ * (get_random_int() & 0x3); |
649 | pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n", | |
650 | kobject_name(kobj), kobj, __func__, kobj->parent, delay); | |
c817a67e | 651 | INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup); |
89c86a64 BH |
652 | |
653 | schedule_delayed_work(&kobj->release, delay); | |
c817a67e RK |
654 | #else |
655 | kobject_cleanup(kobj); | |
656 | #endif | |
1da177e4 LT |
657 | } |
658 | ||
659 | /** | |
e374a2bf GKH |
660 | * kobject_put - decrement refcount for object. |
661 | * @kobj: object. | |
1da177e4 | 662 | * |
e374a2bf | 663 | * Decrement the refcount, and if 0, call kobject_cleanup(). |
1da177e4 | 664 | */ |
e374a2bf | 665 | void kobject_put(struct kobject *kobj) |
1da177e4 | 666 | { |
c1ebdae5 | 667 | if (kobj) { |
d955c78a AV |
668 | if (!kobj->state_initialized) |
669 | WARN(1, KERN_WARNING "kobject: '%s' (%p): is not " | |
c1ebdae5 GKH |
670 | "initialized, yet kobject_put() is being " |
671 | "called.\n", kobject_name(kobj), kobj); | |
1da177e4 | 672 | kref_put(&kobj->kref, kobject_release); |
c1ebdae5 | 673 | } |
1da177e4 LT |
674 | } |
675 | ||
3f9e3ee9 | 676 | static void dynamic_kobj_release(struct kobject *kobj) |
7423172a | 677 | { |
810304db | 678 | pr_debug("kobject: (%p): %s\n", kobj, __func__); |
7423172a JN |
679 | kfree(kobj); |
680 | } | |
681 | ||
3f9e3ee9 | 682 | static struct kobj_type dynamic_kobj_ktype = { |
386f275f KS |
683 | .release = dynamic_kobj_release, |
684 | .sysfs_ops = &kobj_sysfs_ops, | |
7423172a JN |
685 | }; |
686 | ||
43968d2f | 687 | /** |
3f9e3ee9 GKH |
688 | * kobject_create - create a struct kobject dynamically |
689 | * | |
690 | * This function creates a kobject structure dynamically and sets it up | |
691 | * to be a "dynamic" kobject with a default release function set up. | |
692 | * | |
693 | * If the kobject was not able to be created, NULL will be returned. | |
43968d2f | 694 | * The kobject structure returned from here must be cleaned up with a |
f9cb074b | 695 | * call to kobject_put() and not kfree(), as kobject_init() has |
43968d2f | 696 | * already been called on this structure. |
3f9e3ee9 | 697 | */ |
43968d2f | 698 | struct kobject *kobject_create(void) |
3f9e3ee9 GKH |
699 | { |
700 | struct kobject *kobj; | |
701 | ||
702 | kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); | |
703 | if (!kobj) | |
704 | return NULL; | |
705 | ||
f9cb074b | 706 | kobject_init(kobj, &dynamic_kobj_ktype); |
3f9e3ee9 GKH |
707 | return kobj; |
708 | } | |
709 | ||
710 | /** | |
711 | * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs | |
712 | * | |
9ff1f838 | 713 | * @name: the name for the kobject |
3f9e3ee9 GKH |
714 | * @parent: the parent kobject of this kobject, if any. |
715 | * | |
f70701a3 | 716 | * This function creates a kobject structure dynamically and registers it |
3f9e3ee9 | 717 | * with sysfs. When you are finished with this structure, call |
78a2d906 | 718 | * kobject_put() and the structure will be dynamically freed when |
3f9e3ee9 GKH |
719 | * it is no longer being used. |
720 | * | |
721 | * If the kobject was not able to be created, NULL will be returned. | |
722 | */ | |
723 | struct kobject *kobject_create_and_add(const char *name, struct kobject *parent) | |
724 | { | |
725 | struct kobject *kobj; | |
726 | int retval; | |
727 | ||
728 | kobj = kobject_create(); | |
729 | if (!kobj) | |
730 | return NULL; | |
731 | ||
b2d6db58 | 732 | retval = kobject_add(kobj, parent, "%s", name); |
3f9e3ee9 GKH |
733 | if (retval) { |
734 | printk(KERN_WARNING "%s: kobject_add error: %d\n", | |
810304db | 735 | __func__, retval); |
3f9e3ee9 GKH |
736 | kobject_put(kobj); |
737 | kobj = NULL; | |
738 | } | |
739 | return kobj; | |
740 | } | |
741 | EXPORT_SYMBOL_GPL(kobject_create_and_add); | |
742 | ||
1da177e4 | 743 | /** |
e374a2bf GKH |
744 | * kset_init - initialize a kset for use |
745 | * @k: kset | |
1da177e4 | 746 | */ |
e374a2bf | 747 | void kset_init(struct kset *k) |
1da177e4 | 748 | { |
e1543ddf | 749 | kobject_init_internal(&k->kobj); |
1da177e4 LT |
750 | INIT_LIST_HEAD(&k->list); |
751 | spin_lock_init(&k->list_lock); | |
752 | } | |
753 | ||
23b5212c KS |
754 | /* default kobject attribute operations */ |
755 | static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr, | |
756 | char *buf) | |
757 | { | |
758 | struct kobj_attribute *kattr; | |
759 | ssize_t ret = -EIO; | |
760 | ||
761 | kattr = container_of(attr, struct kobj_attribute, attr); | |
762 | if (kattr->show) | |
763 | ret = kattr->show(kobj, kattr, buf); | |
764 | return ret; | |
765 | } | |
766 | ||
767 | static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr, | |
768 | const char *buf, size_t count) | |
769 | { | |
770 | struct kobj_attribute *kattr; | |
771 | ssize_t ret = -EIO; | |
772 | ||
773 | kattr = container_of(attr, struct kobj_attribute, attr); | |
774 | if (kattr->store) | |
775 | ret = kattr->store(kobj, kattr, buf, count); | |
776 | return ret; | |
777 | } | |
778 | ||
52cf25d0 | 779 | const struct sysfs_ops kobj_sysfs_ops = { |
23b5212c KS |
780 | .show = kobj_attr_show, |
781 | .store = kobj_attr_store, | |
782 | }; | |
1da177e4 | 783 | |
eee03164 JM |
784 | /** |
785 | * kobj_completion_init - initialize a kobj_completion object. | |
786 | * @kc: kobj_completion | |
787 | * @ktype: type of kobject to initialize | |
788 | * | |
789 | * kobj_completion structures can be embedded within structures with different | |
790 | * lifetime rules. During the release of the enclosing object, we can | |
791 | * wait on the release of the kobject so that we don't free it while it's | |
792 | * still busy. | |
793 | */ | |
794 | void kobj_completion_init(struct kobj_completion *kc, struct kobj_type *ktype) | |
795 | { | |
796 | init_completion(&kc->kc_unregister); | |
797 | kobject_init(&kc->kc_kobj, ktype); | |
798 | } | |
799 | EXPORT_SYMBOL_GPL(kobj_completion_init); | |
800 | ||
801 | /** | |
802 | * kobj_completion_release - release a kobj_completion object | |
803 | * @kobj: kobject embedded in kobj_completion | |
804 | * | |
805 | * Used with kobject_release to notify waiters that the kobject has been | |
806 | * released. | |
807 | */ | |
808 | void kobj_completion_release(struct kobject *kobj) | |
809 | { | |
810 | struct kobj_completion *kc = kobj_to_kobj_completion(kobj); | |
811 | complete(&kc->kc_unregister); | |
812 | } | |
813 | EXPORT_SYMBOL_GPL(kobj_completion_release); | |
814 | ||
815 | /** | |
816 | * kobj_completion_del_and_wait - release the kobject and wait for it | |
817 | * @kc: kobj_completion object to release | |
818 | * | |
819 | * Delete the kobject from sysfs and drop the reference count. Then wait | |
820 | * until any other outstanding references are also dropped. This routine | |
821 | * is only necessary once other references may have been taken on the | |
822 | * kobject. Typically this happens when the kobject has been published | |
823 | * to sysfs via kobject_add. | |
824 | */ | |
825 | void kobj_completion_del_and_wait(struct kobj_completion *kc) | |
826 | { | |
827 | kobject_del(&kc->kc_kobj); | |
828 | kobject_put(&kc->kc_kobj); | |
829 | wait_for_completion(&kc->kc_unregister); | |
830 | } | |
831 | EXPORT_SYMBOL_GPL(kobj_completion_del_and_wait); | |
832 | ||
1da177e4 | 833 | /** |
e374a2bf GKH |
834 | * kset_register - initialize and add a kset. |
835 | * @k: kset. | |
1da177e4 | 836 | */ |
e374a2bf | 837 | int kset_register(struct kset *k) |
1da177e4 | 838 | { |
80f03e34 KS |
839 | int err; |
840 | ||
31b9025a GKH |
841 | if (!k) |
842 | return -EINVAL; | |
80f03e34 | 843 | |
1da177e4 | 844 | kset_init(k); |
12e339ac | 845 | err = kobject_add_internal(&k->kobj); |
80f03e34 KS |
846 | if (err) |
847 | return err; | |
848 | kobject_uevent(&k->kobj, KOBJ_ADD); | |
849 | return 0; | |
1da177e4 LT |
850 | } |
851 | ||
1da177e4 | 852 | /** |
e374a2bf GKH |
853 | * kset_unregister - remove a kset. |
854 | * @k: kset. | |
1da177e4 | 855 | */ |
e374a2bf | 856 | void kset_unregister(struct kset *k) |
1da177e4 | 857 | { |
31b9025a GKH |
858 | if (!k) |
859 | return; | |
35a5fe69 | 860 | kobject_del(&k->kobj); |
78a2d906 | 861 | kobject_put(&k->kobj); |
1da177e4 LT |
862 | } |
863 | ||
1da177e4 | 864 | /** |
e374a2bf GKH |
865 | * kset_find_obj - search for object in kset. |
866 | * @kset: kset we're looking in. | |
867 | * @name: object's name. | |
1da177e4 | 868 | * |
e374a2bf GKH |
869 | * Lock kset via @kset->subsys, and iterate over @kset->list, |
870 | * looking for a matching kobject. If matching object is found | |
871 | * take a reference and return the object. | |
1da177e4 | 872 | */ |
e374a2bf | 873 | struct kobject *kset_find_obj(struct kset *kset, const char *name) |
1da177e4 | 874 | { |
c6a2a3dc | 875 | struct kobject *k; |
e374a2bf | 876 | struct kobject *ret = NULL; |
1da177e4 LT |
877 | |
878 | spin_lock(&kset->list_lock); | |
c25d1dfb | 879 | |
c6a2a3dc | 880 | list_for_each_entry(k, &kset->list, entry) { |
e374a2bf | 881 | if (kobject_name(k) && !strcmp(kobject_name(k), name)) { |
a49b7e82 | 882 | ret = kobject_get_unless_zero(k); |
1da177e4 LT |
883 | break; |
884 | } | |
885 | } | |
c25d1dfb | 886 | |
1da177e4 LT |
887 | spin_unlock(&kset->list_lock); |
888 | return ret; | |
889 | } | |
890 | ||
b727c702 GKH |
891 | static void kset_release(struct kobject *kobj) |
892 | { | |
893 | struct kset *kset = container_of(kobj, struct kset, kobj); | |
9f66fa2a | 894 | pr_debug("kobject: '%s' (%p): %s\n", |
810304db | 895 | kobject_name(kobj), kobj, __func__); |
b727c702 GKH |
896 | kfree(kset); |
897 | } | |
898 | ||
386f275f KS |
899 | static struct kobj_type kset_ktype = { |
900 | .sysfs_ops = &kobj_sysfs_ops, | |
b727c702 GKH |
901 | .release = kset_release, |
902 | }; | |
903 | ||
904 | /** | |
905 | * kset_create - create a struct kset dynamically | |
906 | * | |
907 | * @name: the name for the kset | |
908 | * @uevent_ops: a struct kset_uevent_ops for the kset | |
909 | * @parent_kobj: the parent kobject of this kset, if any. | |
910 | * | |
911 | * This function creates a kset structure dynamically. This structure can | |
912 | * then be registered with the system and show up in sysfs with a call to | |
913 | * kset_register(). When you are finished with this structure, if | |
914 | * kset_register() has been called, call kset_unregister() and the | |
915 | * structure will be dynamically freed when it is no longer being used. | |
916 | * | |
917 | * If the kset was not able to be created, NULL will be returned. | |
918 | */ | |
919 | static struct kset *kset_create(const char *name, | |
9cd43611 | 920 | const struct kset_uevent_ops *uevent_ops, |
b727c702 GKH |
921 | struct kobject *parent_kobj) |
922 | { | |
923 | struct kset *kset; | |
d9cd8f37 | 924 | int retval; |
b727c702 GKH |
925 | |
926 | kset = kzalloc(sizeof(*kset), GFP_KERNEL); | |
927 | if (!kset) | |
928 | return NULL; | |
b7165ebb | 929 | retval = kobject_set_name(&kset->kobj, "%s", name); |
d9cd8f37 DY |
930 | if (retval) { |
931 | kfree(kset); | |
932 | return NULL; | |
933 | } | |
b727c702 GKH |
934 | kset->uevent_ops = uevent_ops; |
935 | kset->kobj.parent = parent_kobj; | |
936 | ||
937 | /* | |
386f275f | 938 | * The kobject of this kset will have a type of kset_ktype and belong to |
b727c702 GKH |
939 | * no kset itself. That way we can properly free it when it is |
940 | * finished being used. | |
941 | */ | |
386f275f | 942 | kset->kobj.ktype = &kset_ktype; |
b727c702 GKH |
943 | kset->kobj.kset = NULL; |
944 | ||
945 | return kset; | |
946 | } | |
947 | ||
948 | /** | |
949 | * kset_create_and_add - create a struct kset dynamically and add it to sysfs | |
950 | * | |
951 | * @name: the name for the kset | |
952 | * @uevent_ops: a struct kset_uevent_ops for the kset | |
953 | * @parent_kobj: the parent kobject of this kset, if any. | |
954 | * | |
955 | * This function creates a kset structure dynamically and registers it | |
956 | * with sysfs. When you are finished with this structure, call | |
957 | * kset_unregister() and the structure will be dynamically freed when it | |
958 | * is no longer being used. | |
959 | * | |
960 | * If the kset was not able to be created, NULL will be returned. | |
961 | */ | |
962 | struct kset *kset_create_and_add(const char *name, | |
9cd43611 | 963 | const struct kset_uevent_ops *uevent_ops, |
b727c702 GKH |
964 | struct kobject *parent_kobj) |
965 | { | |
966 | struct kset *kset; | |
967 | int error; | |
968 | ||
969 | kset = kset_create(name, uevent_ops, parent_kobj); | |
970 | if (!kset) | |
971 | return NULL; | |
972 | error = kset_register(kset); | |
973 | if (error) { | |
974 | kfree(kset); | |
975 | return NULL; | |
976 | } | |
977 | return kset; | |
978 | } | |
979 | EXPORT_SYMBOL_GPL(kset_create_and_add); | |
980 | ||
bc451f20 EB |
981 | |
982 | static DEFINE_SPINLOCK(kobj_ns_type_lock); | |
983 | static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES]; | |
984 | ||
985 | int kobj_ns_type_register(const struct kobj_ns_type_operations *ops) | |
986 | { | |
987 | enum kobj_ns_type type = ops->type; | |
988 | int error; | |
989 | ||
990 | spin_lock(&kobj_ns_type_lock); | |
991 | ||
992 | error = -EINVAL; | |
993 | if (type >= KOBJ_NS_TYPES) | |
994 | goto out; | |
995 | ||
996 | error = -EINVAL; | |
997 | if (type <= KOBJ_NS_TYPE_NONE) | |
998 | goto out; | |
999 | ||
1000 | error = -EBUSY; | |
1001 | if (kobj_ns_ops_tbl[type]) | |
1002 | goto out; | |
1003 | ||
1004 | error = 0; | |
1005 | kobj_ns_ops_tbl[type] = ops; | |
1006 | ||
1007 | out: | |
1008 | spin_unlock(&kobj_ns_type_lock); | |
1009 | return error; | |
1010 | } | |
1011 | ||
1012 | int kobj_ns_type_registered(enum kobj_ns_type type) | |
1013 | { | |
1014 | int registered = 0; | |
1015 | ||
1016 | spin_lock(&kobj_ns_type_lock); | |
1017 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES)) | |
1018 | registered = kobj_ns_ops_tbl[type] != NULL; | |
1019 | spin_unlock(&kobj_ns_type_lock); | |
1020 | ||
1021 | return registered; | |
1022 | } | |
1023 | ||
1024 | const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent) | |
1025 | { | |
1026 | const struct kobj_ns_type_operations *ops = NULL; | |
1027 | ||
1028 | if (parent && parent->ktype->child_ns_type) | |
1029 | ops = parent->ktype->child_ns_type(parent); | |
1030 | ||
1031 | return ops; | |
1032 | } | |
1033 | ||
1034 | const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj) | |
1035 | { | |
1036 | return kobj_child_ns_ops(kobj->parent); | |
1037 | } | |
1038 | ||
7dc5dbc8 EB |
1039 | bool kobj_ns_current_may_mount(enum kobj_ns_type type) |
1040 | { | |
730d7d33 | 1041 | bool may_mount = true; |
7dc5dbc8 EB |
1042 | |
1043 | spin_lock(&kobj_ns_type_lock); | |
1044 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1045 | kobj_ns_ops_tbl[type]) | |
1046 | may_mount = kobj_ns_ops_tbl[type]->current_may_mount(); | |
1047 | spin_unlock(&kobj_ns_type_lock); | |
1048 | ||
1049 | return may_mount; | |
1050 | } | |
bc451f20 | 1051 | |
a685e089 | 1052 | void *kobj_ns_grab_current(enum kobj_ns_type type) |
bc451f20 | 1053 | { |
a685e089 | 1054 | void *ns = NULL; |
bc451f20 EB |
1055 | |
1056 | spin_lock(&kobj_ns_type_lock); | |
1057 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1058 | kobj_ns_ops_tbl[type]) | |
a685e089 | 1059 | ns = kobj_ns_ops_tbl[type]->grab_current_ns(); |
bc451f20 EB |
1060 | spin_unlock(&kobj_ns_type_lock); |
1061 | ||
1062 | return ns; | |
1063 | } | |
1064 | ||
1065 | const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk) | |
1066 | { | |
1067 | const void *ns = NULL; | |
1068 | ||
1069 | spin_lock(&kobj_ns_type_lock); | |
1070 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1071 | kobj_ns_ops_tbl[type]) | |
1072 | ns = kobj_ns_ops_tbl[type]->netlink_ns(sk); | |
1073 | spin_unlock(&kobj_ns_type_lock); | |
1074 | ||
1075 | return ns; | |
1076 | } | |
1077 | ||
1078 | const void *kobj_ns_initial(enum kobj_ns_type type) | |
1079 | { | |
1080 | const void *ns = NULL; | |
1081 | ||
1082 | spin_lock(&kobj_ns_type_lock); | |
1083 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1084 | kobj_ns_ops_tbl[type]) | |
1085 | ns = kobj_ns_ops_tbl[type]->initial_ns(); | |
1086 | spin_unlock(&kobj_ns_type_lock); | |
1087 | ||
1088 | return ns; | |
1089 | } | |
1090 | ||
a685e089 | 1091 | void kobj_ns_drop(enum kobj_ns_type type, void *ns) |
bc451f20 | 1092 | { |
a685e089 AV |
1093 | spin_lock(&kobj_ns_type_lock); |
1094 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1095 | kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns) | |
1096 | kobj_ns_ops_tbl[type]->drop_ns(ns); | |
1097 | spin_unlock(&kobj_ns_type_lock); | |
bc451f20 EB |
1098 | } |
1099 | ||
1da177e4 LT |
1100 | EXPORT_SYMBOL(kobject_get); |
1101 | EXPORT_SYMBOL(kobject_put); | |
1da177e4 LT |
1102 | EXPORT_SYMBOL(kobject_del); |
1103 | ||
1104 | EXPORT_SYMBOL(kset_register); | |
1105 | EXPORT_SYMBOL(kset_unregister); |