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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 | ||
4e5feafc DT |
40 | /** |
41 | * kobject_get_ownership - get sysfs ownership data for @kobj | |
42 | * @kobj: kobject in question | |
43 | * @uid: kernel user ID for sysfs objects | |
44 | * @gid: kernel group ID for sysfs objects | |
45 | * | |
46 | * Returns initial uid/gid pair that should be used when creating sysfs | |
47 | * representation of given kobject. Normally used to adjust ownership of | |
48 | * objects in a container. | |
49 | */ | |
50 | void kobject_get_ownership(struct kobject *kobj, kuid_t *uid, kgid_t *gid) | |
51 | { | |
52 | *uid = GLOBAL_ROOT_UID; | |
53 | *gid = GLOBAL_ROOT_GID; | |
54 | ||
55 | if (kobj->ktype->get_ownership) | |
56 | kobj->ktype->get_ownership(kobj, uid, gid); | |
57 | } | |
58 | ||
e374a2bf GKH |
59 | /* |
60 | * populate_dir - populate directory with attributes. | |
61 | * @kobj: object we're working on. | |
1da177e4 | 62 | * |
e374a2bf GKH |
63 | * Most subsystems have a set of default attributes that are associated |
64 | * with an object that registers with them. This is a helper called during | |
65 | * object registration that loops through the default attributes of the | |
66 | * subsystem and creates attributes files for them in sysfs. | |
1da177e4 | 67 | */ |
e374a2bf | 68 | static int populate_dir(struct kobject *kobj) |
1da177e4 | 69 | { |
e374a2bf GKH |
70 | struct kobj_type *t = get_ktype(kobj); |
71 | struct attribute *attr; | |
1da177e4 LT |
72 | int error = 0; |
73 | int i; | |
e374a2bf | 74 | |
1da177e4 LT |
75 | if (t && t->default_attrs) { |
76 | for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) { | |
e374a2bf GKH |
77 | error = sysfs_create_file(kobj, attr); |
78 | if (error) | |
1da177e4 LT |
79 | break; |
80 | } | |
81 | } | |
82 | return error; | |
83 | } | |
84 | ||
e374a2bf | 85 | static int create_dir(struct kobject *kobj) |
1da177e4 | 86 | { |
c84a3b27 | 87 | const struct kobj_ns_type_operations *ops; |
e34ff490 TH |
88 | int error; |
89 | ||
90 | error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj)); | |
c84a3b27 TH |
91 | if (error) |
92 | return error; | |
93 | ||
94 | error = populate_dir(kobj); | |
95 | if (error) { | |
96 | sysfs_remove_dir(kobj); | |
97 | return error; | |
1da177e4 | 98 | } |
26ea12de TH |
99 | |
100 | /* | |
101 | * @kobj->sd may be deleted by an ancestor going away. Hold an | |
102 | * extra reference so that it stays until @kobj is gone. | |
103 | */ | |
104 | sysfs_get(kobj->sd); | |
105 | ||
c84a3b27 TH |
106 | /* |
107 | * If @kobj has ns_ops, its children need to be filtered based on | |
108 | * their namespace tags. Enable namespace support on @kobj->sd. | |
109 | */ | |
110 | ops = kobj_child_ns_ops(kobj); | |
111 | if (ops) { | |
112 | BUG_ON(ops->type <= KOBJ_NS_TYPE_NONE); | |
113 | BUG_ON(ops->type >= KOBJ_NS_TYPES); | |
114 | BUG_ON(!kobj_ns_type_registered(ops->type)); | |
115 | ||
fa4cd451 | 116 | sysfs_enable_ns(kobj->sd); |
c84a3b27 TH |
117 | } |
118 | ||
119 | return 0; | |
1da177e4 LT |
120 | } |
121 | ||
1da177e4 LT |
122 | static int get_kobj_path_length(struct kobject *kobj) |
123 | { | |
124 | int length = 1; | |
e374a2bf | 125 | struct kobject *parent = kobj; |
1da177e4 | 126 | |
e374a2bf | 127 | /* walk up the ancestors until we hit the one pointing to the |
1da177e4 LT |
128 | * root. |
129 | * Add 1 to strlen for leading '/' of each level. | |
130 | */ | |
131 | do { | |
b365b3da CE |
132 | if (kobject_name(parent) == NULL) |
133 | return 0; | |
1da177e4 LT |
134 | length += strlen(kobject_name(parent)) + 1; |
135 | parent = parent->parent; | |
136 | } while (parent); | |
137 | return length; | |
138 | } | |
139 | ||
140 | static void fill_kobj_path(struct kobject *kobj, char *path, int length) | |
141 | { | |
e374a2bf | 142 | struct kobject *parent; |
1da177e4 LT |
143 | |
144 | --length; | |
145 | for (parent = kobj; parent; parent = parent->parent) { | |
146 | int cur = strlen(kobject_name(parent)); | |
147 | /* back up enough to print this name with '/' */ | |
148 | length -= cur; | |
f8c767e7 | 149 | memcpy(path + length, kobject_name(parent), cur); |
1da177e4 LT |
150 | *(path + --length) = '/'; |
151 | } | |
152 | ||
9f66fa2a | 153 | pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj), |
810304db | 154 | kobj, __func__, path); |
1da177e4 LT |
155 | } |
156 | ||
157 | /** | |
72fd4a35 | 158 | * kobject_get_path - generate and return the path associated with a given kobj and kset pair. |
1da177e4 LT |
159 | * |
160 | * @kobj: kobject in question, with which to build the path | |
161 | * @gfp_mask: the allocation type used to allocate the path | |
72fd4a35 RD |
162 | * |
163 | * The result must be freed by the caller with kfree(). | |
1da177e4 | 164 | */ |
fd4f2df2 | 165 | char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask) |
1da177e4 LT |
166 | { |
167 | char *path; | |
168 | int len; | |
169 | ||
170 | len = get_kobj_path_length(kobj); | |
b365b3da CE |
171 | if (len == 0) |
172 | return NULL; | |
4668edc3 | 173 | path = kzalloc(len, gfp_mask); |
1da177e4 LT |
174 | if (!path) |
175 | return NULL; | |
1da177e4 LT |
176 | fill_kobj_path(kobj, path, len); |
177 | ||
178 | return path; | |
179 | } | |
80fc9f53 | 180 | EXPORT_SYMBOL_GPL(kobject_get_path); |
1da177e4 | 181 | |
0f4dafc0 KS |
182 | /* add the kobject to its kset's list */ |
183 | static void kobj_kset_join(struct kobject *kobj) | |
1da177e4 | 184 | { |
0f4dafc0 | 185 | if (!kobj->kset) |
31b9025a | 186 | return; |
0f4dafc0 KS |
187 | |
188 | kset_get(kobj->kset); | |
189 | spin_lock(&kobj->kset->list_lock); | |
190 | list_add_tail(&kobj->entry, &kobj->kset->list); | |
191 | spin_unlock(&kobj->kset->list_lock); | |
1da177e4 LT |
192 | } |
193 | ||
0f4dafc0 KS |
194 | /* remove the kobject from its kset's list */ |
195 | static void kobj_kset_leave(struct kobject *kobj) | |
196 | { | |
197 | if (!kobj->kset) | |
198 | return; | |
1da177e4 | 199 | |
0f4dafc0 KS |
200 | spin_lock(&kobj->kset->list_lock); |
201 | list_del_init(&kobj->entry); | |
202 | spin_unlock(&kobj->kset->list_lock); | |
203 | kset_put(kobj->kset); | |
204 | } | |
1da177e4 | 205 | |
e374a2bf | 206 | static void kobject_init_internal(struct kobject *kobj) |
1da177e4 | 207 | { |
0f4dafc0 KS |
208 | if (!kobj) |
209 | return; | |
210 | kref_init(&kobj->kref); | |
211 | INIT_LIST_HEAD(&kobj->entry); | |
a4573c48 GKH |
212 | kobj->state_in_sysfs = 0; |
213 | kobj->state_add_uevent_sent = 0; | |
214 | kobj->state_remove_uevent_sent = 0; | |
215 | kobj->state_initialized = 1; | |
1da177e4 LT |
216 | } |
217 | ||
0f4dafc0 | 218 | |
9e7bbccd | 219 | static int kobject_add_internal(struct kobject *kobj) |
1da177e4 LT |
220 | { |
221 | int error = 0; | |
e374a2bf | 222 | struct kobject *parent; |
1da177e4 | 223 | |
0f4dafc0 | 224 | if (!kobj) |
1da177e4 | 225 | return -ENOENT; |
0f4dafc0 | 226 | |
af5ca3f4 | 227 | if (!kobj->name || !kobj->name[0]) { |
d955c78a | 228 | WARN(1, "kobject: (%p): attempted to be registered with empty " |
9f66fa2a | 229 | "name!\n", kobj); |
c171fef5 GKH |
230 | return -EINVAL; |
231 | } | |
1da177e4 | 232 | |
0f4dafc0 | 233 | parent = kobject_get(kobj->parent); |
1da177e4 | 234 | |
0f4dafc0 | 235 | /* join kset if set, use it as parent if we do not already have one */ |
1da177e4 | 236 | if (kobj->kset) { |
0f4dafc0 | 237 | if (!parent) |
1da177e4 | 238 | parent = kobject_get(&kobj->kset->kobj); |
0f4dafc0 | 239 | kobj_kset_join(kobj); |
460f7e9a | 240 | kobj->parent = parent; |
1da177e4 | 241 | } |
1da177e4 | 242 | |
0f4dafc0 | 243 | pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n", |
810304db | 244 | kobject_name(kobj), kobj, __func__, |
0f4dafc0 | 245 | parent ? kobject_name(parent) : "<NULL>", |
e374a2bf | 246 | kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>"); |
0f4dafc0 | 247 | |
90bc6135 | 248 | error = create_dir(kobj); |
1da177e4 | 249 | if (error) { |
0f4dafc0 KS |
250 | kobj_kset_leave(kobj); |
251 | kobject_put(parent); | |
252 | kobj->parent = NULL; | |
dcd0da00 GKH |
253 | |
254 | /* be noisy on error issues */ | |
255 | if (error == -EEXIST) | |
bf4ac5a1 DV |
256 | pr_err("%s failed for %s with -EEXIST, don't try to register things with the same name in the same directory.\n", |
257 | __func__, kobject_name(kobj)); | |
dcd0da00 | 258 | else |
bf4ac5a1 DV |
259 | pr_err("%s failed for %s (error: %d parent: %s)\n", |
260 | __func__, kobject_name(kobj), error, | |
261 | parent ? kobject_name(parent) : "'none'"); | |
0f4dafc0 KS |
262 | } else |
263 | kobj->state_in_sysfs = 1; | |
1da177e4 LT |
264 | |
265 | return error; | |
266 | } | |
267 | ||
663a4743 GKH |
268 | /** |
269 | * kobject_set_name_vargs - Set the name of an kobject | |
270 | * @kobj: struct kobject to set the name of | |
271 | * @fmt: format string used to build the name | |
272 | * @vargs: vargs to format the string. | |
273 | */ | |
1fa5ae85 | 274 | int kobject_set_name_vargs(struct kobject *kobj, const char *fmt, |
663a4743 GKH |
275 | va_list vargs) |
276 | { | |
f773f32d | 277 | const char *s; |
663a4743 | 278 | |
8a577ffc KS |
279 | if (kobj->name && !fmt) |
280 | return 0; | |
281 | ||
f773f32d | 282 | s = kvasprintf_const(GFP_KERNEL, fmt, vargs); |
2abf114f | 283 | if (!s) |
a4ca6617 | 284 | return -ENOMEM; |
663a4743 | 285 | |
f773f32d RV |
286 | /* |
287 | * ewww... some of these buggers have '/' in the name ... If | |
288 | * that's the case, we need to make sure we have an actual | |
289 | * allocated copy to modify, since kvasprintf_const may have | |
290 | * returned something from .rodata. | |
291 | */ | |
292 | if (strchr(s, '/')) { | |
293 | char *t; | |
294 | ||
295 | t = kstrdup(s, GFP_KERNEL); | |
296 | kfree_const(s); | |
297 | if (!t) | |
298 | return -ENOMEM; | |
299 | strreplace(t, '/', '!'); | |
300 | s = t; | |
301 | } | |
302 | kfree_const(kobj->name); | |
2abf114f | 303 | kobj->name = s; |
9f255651 | 304 | |
663a4743 GKH |
305 | return 0; |
306 | } | |
1da177e4 LT |
307 | |
308 | /** | |
8c4606b1 | 309 | * kobject_set_name - Set the name of a kobject |
663a4743 | 310 | * @kobj: struct kobject to set the name of |
8c4606b1 | 311 | * @fmt: format string used to build the name |
1da177e4 | 312 | * |
8c4606b1 GKH |
313 | * This sets the name of the kobject. If you have already added the |
314 | * kobject to the system, you must call kobject_rename() in order to | |
315 | * change the name of the kobject. | |
1da177e4 | 316 | */ |
663a4743 | 317 | int kobject_set_name(struct kobject *kobj, const char *fmt, ...) |
1da177e4 | 318 | { |
a4ca6617 | 319 | va_list vargs; |
663a4743 | 320 | int retval; |
1da177e4 | 321 | |
a4ca6617 KS |
322 | va_start(vargs, fmt); |
323 | retval = kobject_set_name_vargs(kobj, fmt, vargs); | |
324 | va_end(vargs); | |
1da177e4 | 325 | |
663a4743 | 326 | return retval; |
1da177e4 | 327 | } |
1da177e4 LT |
328 | EXPORT_SYMBOL(kobject_set_name); |
329 | ||
e86000d0 | 330 | /** |
f9cb074b | 331 | * kobject_init - initialize a kobject structure |
e86000d0 GKH |
332 | * @kobj: pointer to the kobject to initialize |
333 | * @ktype: pointer to the ktype for this kobject. | |
334 | * | |
335 | * This function will properly initialize a kobject such that it can then | |
336 | * be passed to the kobject_add() call. | |
337 | * | |
338 | * After this function is called, the kobject MUST be cleaned up by a call | |
339 | * to kobject_put(), not by a call to kfree directly to ensure that all of | |
340 | * the memory is cleaned up properly. | |
341 | */ | |
f9cb074b | 342 | void kobject_init(struct kobject *kobj, struct kobj_type *ktype) |
e86000d0 GKH |
343 | { |
344 | char *err_str; | |
345 | ||
346 | if (!kobj) { | |
347 | err_str = "invalid kobject pointer!"; | |
348 | goto error; | |
349 | } | |
350 | if (!ktype) { | |
351 | err_str = "must have a ktype to be initialized properly!\n"; | |
352 | goto error; | |
353 | } | |
0f4dafc0 | 354 | if (kobj->state_initialized) { |
e86000d0 | 355 | /* do not error out as sometimes we can recover */ |
0f4dafc0 KS |
356 | printk(KERN_ERR "kobject (%p): tried to init an initialized " |
357 | "object, something is seriously wrong.\n", kobj); | |
e86000d0 GKH |
358 | dump_stack(); |
359 | } | |
360 | ||
a4573c48 | 361 | kobject_init_internal(kobj); |
e86000d0 GKH |
362 | kobj->ktype = ktype; |
363 | return; | |
364 | ||
365 | error: | |
0f4dafc0 | 366 | printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str); |
e86000d0 GKH |
367 | dump_stack(); |
368 | } | |
f9cb074b | 369 | EXPORT_SYMBOL(kobject_init); |
e86000d0 | 370 | |
8db14860 NI |
371 | static __printf(3, 0) int kobject_add_varg(struct kobject *kobj, |
372 | struct kobject *parent, | |
373 | const char *fmt, va_list vargs) | |
244f6cee | 374 | { |
244f6cee GKH |
375 | int retval; |
376 | ||
a4ca6617 | 377 | retval = kobject_set_name_vargs(kobj, fmt, vargs); |
244f6cee GKH |
378 | if (retval) { |
379 | printk(KERN_ERR "kobject: can not set name properly!\n"); | |
380 | return retval; | |
381 | } | |
382 | kobj->parent = parent; | |
9e7bbccd | 383 | return kobject_add_internal(kobj); |
244f6cee GKH |
384 | } |
385 | ||
386 | /** | |
b2d6db58 | 387 | * kobject_add - the main kobject add function |
244f6cee GKH |
388 | * @kobj: the kobject to add |
389 | * @parent: pointer to the parent of the kobject. | |
390 | * @fmt: format to name the kobject with. | |
391 | * | |
392 | * The kobject name is set and added to the kobject hierarchy in this | |
393 | * function. | |
394 | * | |
395 | * If @parent is set, then the parent of the @kobj will be set to it. | |
396 | * If @parent is NULL, then the parent of the @kobj will be set to the | |
9705710e | 397 | * kobject associated with the kset assigned to this kobject. If no kset |
244f6cee GKH |
398 | * is assigned to the kobject, then the kobject will be located in the |
399 | * root of the sysfs tree. | |
400 | * | |
401 | * If this function returns an error, kobject_put() must be called to | |
402 | * properly clean up the memory associated with the object. | |
244f6cee GKH |
403 | * Under no instance should the kobject that is passed to this function |
404 | * be directly freed with a call to kfree(), that can leak memory. | |
405 | * | |
0f4dafc0 | 406 | * Note, no "add" uevent will be created with this call, the caller should set |
244f6cee GKH |
407 | * up all of the necessary sysfs files for the object and then call |
408 | * kobject_uevent() with the UEVENT_ADD parameter to ensure that | |
409 | * userspace is properly notified of this kobject's creation. | |
410 | */ | |
b2d6db58 GKH |
411 | int kobject_add(struct kobject *kobj, struct kobject *parent, |
412 | const char *fmt, ...) | |
244f6cee GKH |
413 | { |
414 | va_list args; | |
415 | int retval; | |
416 | ||
417 | if (!kobj) | |
418 | return -EINVAL; | |
419 | ||
0f4dafc0 KS |
420 | if (!kobj->state_initialized) { |
421 | printk(KERN_ERR "kobject '%s' (%p): tried to add an " | |
422 | "uninitialized object, something is seriously wrong.\n", | |
423 | kobject_name(kobj), kobj); | |
424 | dump_stack(); | |
425 | return -EINVAL; | |
426 | } | |
244f6cee GKH |
427 | va_start(args, fmt); |
428 | retval = kobject_add_varg(kobj, parent, fmt, args); | |
429 | va_end(args); | |
430 | ||
431 | return retval; | |
432 | } | |
b2d6db58 | 433 | EXPORT_SYMBOL(kobject_add); |
244f6cee | 434 | |
c11c4154 GKH |
435 | /** |
436 | * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy | |
437 | * @kobj: pointer to the kobject to initialize | |
438 | * @ktype: pointer to the ktype for this kobject. | |
439 | * @parent: pointer to the parent of this kobject. | |
440 | * @fmt: the name of the kobject. | |
441 | * | |
f9cb074b | 442 | * This function combines the call to kobject_init() and |
b2d6db58 GKH |
443 | * kobject_add(). The same type of error handling after a call to |
444 | * kobject_add() and kobject lifetime rules are the same here. | |
c11c4154 GKH |
445 | */ |
446 | int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype, | |
447 | struct kobject *parent, const char *fmt, ...) | |
448 | { | |
449 | va_list args; | |
450 | int retval; | |
451 | ||
f9cb074b | 452 | kobject_init(kobj, ktype); |
c11c4154 GKH |
453 | |
454 | va_start(args, fmt); | |
455 | retval = kobject_add_varg(kobj, parent, fmt, args); | |
456 | va_end(args); | |
457 | ||
458 | return retval; | |
459 | } | |
460 | EXPORT_SYMBOL_GPL(kobject_init_and_add); | |
461 | ||
1da177e4 | 462 | /** |
e374a2bf GKH |
463 | * kobject_rename - change the name of an object |
464 | * @kobj: object in question. | |
465 | * @new_name: object's new name | |
030c1d2b EB |
466 | * |
467 | * It is the responsibility of the caller to provide mutual | |
468 | * exclusion between two different calls of kobject_rename | |
469 | * on the same kobject and to ensure that new_name is valid and | |
470 | * won't conflict with other kobjects. | |
1da177e4 | 471 | */ |
e374a2bf | 472 | int kobject_rename(struct kobject *kobj, const char *new_name) |
1da177e4 LT |
473 | { |
474 | int error = 0; | |
ca2f37db | 475 | const char *devpath = NULL; |
0b4a4fea | 476 | const char *dup_name = NULL, *name; |
ca2f37db JT |
477 | char *devpath_string = NULL; |
478 | char *envp[2]; | |
1da177e4 LT |
479 | |
480 | kobj = kobject_get(kobj); | |
481 | if (!kobj) | |
482 | return -EINVAL; | |
b592fcfe EB |
483 | if (!kobj->parent) |
484 | return -EINVAL; | |
ca2f37db JT |
485 | |
486 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
487 | if (!devpath) { | |
488 | error = -ENOMEM; | |
489 | goto out; | |
490 | } | |
491 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
492 | if (!devpath_string) { | |
493 | error = -ENOMEM; | |
494 | goto out; | |
495 | } | |
496 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
497 | envp[0] = devpath_string; | |
498 | envp[1] = NULL; | |
ca2f37db | 499 | |
f773f32d | 500 | name = dup_name = kstrdup_const(new_name, GFP_KERNEL); |
0b4a4fea EB |
501 | if (!name) { |
502 | error = -ENOMEM; | |
503 | goto out; | |
504 | } | |
505 | ||
e34ff490 | 506 | error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj)); |
0b4a4fea EB |
507 | if (error) |
508 | goto out; | |
509 | ||
510 | /* Install the new kobject name */ | |
511 | dup_name = kobj->name; | |
512 | kobj->name = name; | |
ca2f37db JT |
513 | |
514 | /* This function is mostly/only used for network interface. | |
515 | * Some hotplug package track interfaces by their name and | |
516 | * therefore want to know when the name is changed by the user. */ | |
0b4a4fea | 517 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); |
ca2f37db JT |
518 | |
519 | out: | |
f773f32d | 520 | kfree_const(dup_name); |
ca2f37db JT |
521 | kfree(devpath_string); |
522 | kfree(devpath); | |
b592fcfe EB |
523 | kobject_put(kobj); |
524 | ||
525 | return error; | |
526 | } | |
8344b568 | 527 | EXPORT_SYMBOL_GPL(kobject_rename); |
b592fcfe | 528 | |
8a82472f | 529 | /** |
e374a2bf GKH |
530 | * kobject_move - move object to another parent |
531 | * @kobj: object in question. | |
532 | * @new_parent: object's new parent (can be NULL) | |
8a82472f | 533 | */ |
8a82472f CH |
534 | int kobject_move(struct kobject *kobj, struct kobject *new_parent) |
535 | { | |
536 | int error; | |
537 | struct kobject *old_parent; | |
538 | const char *devpath = NULL; | |
539 | char *devpath_string = NULL; | |
540 | char *envp[2]; | |
541 | ||
542 | kobj = kobject_get(kobj); | |
543 | if (!kobj) | |
544 | return -EINVAL; | |
545 | new_parent = kobject_get(new_parent); | |
546 | if (!new_parent) { | |
c744aeae CH |
547 | if (kobj->kset) |
548 | new_parent = kobject_get(&kobj->kset->kobj); | |
8a82472f | 549 | } |
e34ff490 | 550 | |
8a82472f CH |
551 | /* old object path */ |
552 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
553 | if (!devpath) { | |
554 | error = -ENOMEM; | |
555 | goto out; | |
556 | } | |
557 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); | |
558 | if (!devpath_string) { | |
559 | error = -ENOMEM; | |
560 | goto out; | |
561 | } | |
562 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); | |
563 | envp[0] = devpath_string; | |
564 | envp[1] = NULL; | |
e34ff490 | 565 | error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj)); |
8a82472f CH |
566 | if (error) |
567 | goto out; | |
568 | old_parent = kobj->parent; | |
569 | kobj->parent = new_parent; | |
9e993efb | 570 | new_parent = NULL; |
8a82472f CH |
571 | kobject_put(old_parent); |
572 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); | |
573 | out: | |
9e993efb | 574 | kobject_put(new_parent); |
8a82472f CH |
575 | kobject_put(kobj); |
576 | kfree(devpath_string); | |
577 | kfree(devpath); | |
578 | return error; | |
579 | } | |
24199d20 | 580 | EXPORT_SYMBOL_GPL(kobject_move); |
8a82472f | 581 | |
1da177e4 | 582 | /** |
e374a2bf GKH |
583 | * kobject_del - unlink kobject from hierarchy. |
584 | * @kobj: object. | |
1da177e4 | 585 | */ |
e374a2bf | 586 | void kobject_del(struct kobject *kobj) |
1da177e4 | 587 | { |
324a56e1 | 588 | struct kernfs_node *sd; |
26ea12de | 589 | |
31b9025a GKH |
590 | if (!kobj) |
591 | return; | |
0f4dafc0 | 592 | |
26ea12de | 593 | sd = kobj->sd; |
1da177e4 | 594 | sysfs_remove_dir(kobj); |
26ea12de TH |
595 | sysfs_put(sd); |
596 | ||
0f4dafc0 KS |
597 | kobj->state_in_sysfs = 0; |
598 | kobj_kset_leave(kobj); | |
599 | kobject_put(kobj->parent); | |
600 | kobj->parent = NULL; | |
1da177e4 | 601 | } |
fa40ae34 | 602 | EXPORT_SYMBOL(kobject_del); |
1da177e4 | 603 | |
1da177e4 | 604 | /** |
e374a2bf GKH |
605 | * kobject_get - increment refcount for object. |
606 | * @kobj: object. | |
1da177e4 | 607 | */ |
e374a2bf | 608 | struct kobject *kobject_get(struct kobject *kobj) |
1da177e4 | 609 | { |
d82d54af EZ |
610 | if (kobj) { |
611 | if (!kobj->state_initialized) | |
612 | WARN(1, KERN_WARNING "kobject: '%s' (%p): is not " | |
613 | "initialized, yet kobject_get() is being " | |
614 | "called.\n", kobject_name(kobj), kobj); | |
1da177e4 | 615 | kref_get(&kobj->kref); |
d82d54af | 616 | } |
1da177e4 LT |
617 | return kobj; |
618 | } | |
fa40ae34 | 619 | EXPORT_SYMBOL(kobject_get); |
1da177e4 | 620 | |
c70c176f | 621 | struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj) |
a49b7e82 | 622 | { |
c70c176f JK |
623 | if (!kobj) |
624 | return NULL; | |
a49b7e82 LT |
625 | if (!kref_get_unless_zero(&kobj->kref)) |
626 | kobj = NULL; | |
627 | return kobj; | |
628 | } | |
c70c176f | 629 | EXPORT_SYMBOL(kobject_get_unless_zero); |
a49b7e82 | 630 | |
18041f47 GKH |
631 | /* |
632 | * kobject_cleanup - free kobject resources. | |
633 | * @kobj: object to cleanup | |
1da177e4 | 634 | */ |
18041f47 | 635 | static void kobject_cleanup(struct kobject *kobj) |
1da177e4 | 636 | { |
0f4dafc0 | 637 | struct kobj_type *t = get_ktype(kobj); |
af5ca3f4 | 638 | const char *name = kobj->name; |
1da177e4 | 639 | |
c817a67e RK |
640 | pr_debug("kobject: '%s' (%p): %s, parent %p\n", |
641 | kobject_name(kobj), kobj, __func__, kobj->parent); | |
0f4dafc0 KS |
642 | |
643 | if (t && !t->release) | |
644 | pr_debug("kobject: '%s' (%p): does not have a release() " | |
645 | "function, it is broken and must be fixed.\n", | |
646 | kobject_name(kobj), kobj); | |
647 | ||
648 | /* send "remove" if the caller did not do it but sent "add" */ | |
649 | if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) { | |
650 | pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n", | |
651 | kobject_name(kobj), kobj); | |
652 | kobject_uevent(kobj, KOBJ_REMOVE); | |
653 | } | |
654 | ||
655 | /* remove from sysfs if the caller did not do it */ | |
656 | if (kobj->state_in_sysfs) { | |
657 | pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n", | |
658 | kobject_name(kobj), kobj); | |
659 | kobject_del(kobj); | |
660 | } | |
661 | ||
ce2c9cb0 | 662 | if (t && t->release) { |
0f4dafc0 KS |
663 | pr_debug("kobject: '%s' (%p): calling ktype release\n", |
664 | kobject_name(kobj), kobj); | |
1da177e4 | 665 | t->release(kobj); |
0f4dafc0 KS |
666 | } |
667 | ||
668 | /* free name if we allocated it */ | |
af5ca3f4 | 669 | if (name) { |
0f4dafc0 | 670 | pr_debug("kobject: '%s': free name\n", name); |
f773f32d | 671 | kfree_const(name); |
ce2c9cb0 | 672 | } |
1da177e4 LT |
673 | } |
674 | ||
c817a67e RK |
675 | #ifdef CONFIG_DEBUG_KOBJECT_RELEASE |
676 | static void kobject_delayed_cleanup(struct work_struct *work) | |
677 | { | |
678 | kobject_cleanup(container_of(to_delayed_work(work), | |
679 | struct kobject, release)); | |
680 | } | |
681 | #endif | |
682 | ||
1da177e4 LT |
683 | static void kobject_release(struct kref *kref) |
684 | { | |
c817a67e RK |
685 | struct kobject *kobj = container_of(kref, struct kobject, kref); |
686 | #ifdef CONFIG_DEBUG_KOBJECT_RELEASE | |
89c86a64 BH |
687 | unsigned long delay = HZ + HZ * (get_random_int() & 0x3); |
688 | pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n", | |
689 | kobject_name(kobj), kobj, __func__, kobj->parent, delay); | |
c817a67e | 690 | INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup); |
89c86a64 BH |
691 | |
692 | schedule_delayed_work(&kobj->release, delay); | |
c817a67e RK |
693 | #else |
694 | kobject_cleanup(kobj); | |
695 | #endif | |
1da177e4 LT |
696 | } |
697 | ||
698 | /** | |
e374a2bf GKH |
699 | * kobject_put - decrement refcount for object. |
700 | * @kobj: object. | |
1da177e4 | 701 | * |
e374a2bf | 702 | * Decrement the refcount, and if 0, call kobject_cleanup(). |
1da177e4 | 703 | */ |
e374a2bf | 704 | void kobject_put(struct kobject *kobj) |
1da177e4 | 705 | { |
c1ebdae5 | 706 | if (kobj) { |
d955c78a AV |
707 | if (!kobj->state_initialized) |
708 | WARN(1, KERN_WARNING "kobject: '%s' (%p): is not " | |
c1ebdae5 GKH |
709 | "initialized, yet kobject_put() is being " |
710 | "called.\n", kobject_name(kobj), kobj); | |
1da177e4 | 711 | kref_put(&kobj->kref, kobject_release); |
c1ebdae5 | 712 | } |
1da177e4 | 713 | } |
fa40ae34 | 714 | EXPORT_SYMBOL(kobject_put); |
1da177e4 | 715 | |
3f9e3ee9 | 716 | static void dynamic_kobj_release(struct kobject *kobj) |
7423172a | 717 | { |
810304db | 718 | pr_debug("kobject: (%p): %s\n", kobj, __func__); |
7423172a JN |
719 | kfree(kobj); |
720 | } | |
721 | ||
3f9e3ee9 | 722 | static struct kobj_type dynamic_kobj_ktype = { |
386f275f KS |
723 | .release = dynamic_kobj_release, |
724 | .sysfs_ops = &kobj_sysfs_ops, | |
7423172a JN |
725 | }; |
726 | ||
43968d2f | 727 | /** |
3f9e3ee9 GKH |
728 | * kobject_create - create a struct kobject dynamically |
729 | * | |
730 | * This function creates a kobject structure dynamically and sets it up | |
731 | * to be a "dynamic" kobject with a default release function set up. | |
732 | * | |
733 | * If the kobject was not able to be created, NULL will be returned. | |
43968d2f | 734 | * The kobject structure returned from here must be cleaned up with a |
f9cb074b | 735 | * call to kobject_put() and not kfree(), as kobject_init() has |
43968d2f | 736 | * already been called on this structure. |
3f9e3ee9 | 737 | */ |
43968d2f | 738 | struct kobject *kobject_create(void) |
3f9e3ee9 GKH |
739 | { |
740 | struct kobject *kobj; | |
741 | ||
742 | kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); | |
743 | if (!kobj) | |
744 | return NULL; | |
745 | ||
f9cb074b | 746 | kobject_init(kobj, &dynamic_kobj_ktype); |
3f9e3ee9 GKH |
747 | return kobj; |
748 | } | |
749 | ||
750 | /** | |
751 | * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs | |
752 | * | |
9ff1f838 | 753 | * @name: the name for the kobject |
3f9e3ee9 GKH |
754 | * @parent: the parent kobject of this kobject, if any. |
755 | * | |
f70701a3 | 756 | * This function creates a kobject structure dynamically and registers it |
3f9e3ee9 | 757 | * with sysfs. When you are finished with this structure, call |
78a2d906 | 758 | * kobject_put() and the structure will be dynamically freed when |
3f9e3ee9 GKH |
759 | * it is no longer being used. |
760 | * | |
761 | * If the kobject was not able to be created, NULL will be returned. | |
762 | */ | |
763 | struct kobject *kobject_create_and_add(const char *name, struct kobject *parent) | |
764 | { | |
765 | struct kobject *kobj; | |
766 | int retval; | |
767 | ||
768 | kobj = kobject_create(); | |
769 | if (!kobj) | |
770 | return NULL; | |
771 | ||
b2d6db58 | 772 | retval = kobject_add(kobj, parent, "%s", name); |
3f9e3ee9 GKH |
773 | if (retval) { |
774 | printk(KERN_WARNING "%s: kobject_add error: %d\n", | |
810304db | 775 | __func__, retval); |
3f9e3ee9 GKH |
776 | kobject_put(kobj); |
777 | kobj = NULL; | |
778 | } | |
779 | return kobj; | |
780 | } | |
781 | EXPORT_SYMBOL_GPL(kobject_create_and_add); | |
782 | ||
1da177e4 | 783 | /** |
e374a2bf GKH |
784 | * kset_init - initialize a kset for use |
785 | * @k: kset | |
1da177e4 | 786 | */ |
e374a2bf | 787 | void kset_init(struct kset *k) |
1da177e4 | 788 | { |
e1543ddf | 789 | kobject_init_internal(&k->kobj); |
1da177e4 LT |
790 | INIT_LIST_HEAD(&k->list); |
791 | spin_lock_init(&k->list_lock); | |
792 | } | |
793 | ||
23b5212c KS |
794 | /* default kobject attribute operations */ |
795 | static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr, | |
796 | char *buf) | |
797 | { | |
798 | struct kobj_attribute *kattr; | |
799 | ssize_t ret = -EIO; | |
800 | ||
801 | kattr = container_of(attr, struct kobj_attribute, attr); | |
802 | if (kattr->show) | |
803 | ret = kattr->show(kobj, kattr, buf); | |
804 | return ret; | |
805 | } | |
806 | ||
807 | static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr, | |
808 | const char *buf, size_t count) | |
809 | { | |
810 | struct kobj_attribute *kattr; | |
811 | ssize_t ret = -EIO; | |
812 | ||
813 | kattr = container_of(attr, struct kobj_attribute, attr); | |
814 | if (kattr->store) | |
815 | ret = kattr->store(kobj, kattr, buf, count); | |
816 | return ret; | |
817 | } | |
818 | ||
52cf25d0 | 819 | const struct sysfs_ops kobj_sysfs_ops = { |
23b5212c KS |
820 | .show = kobj_attr_show, |
821 | .store = kobj_attr_store, | |
822 | }; | |
29dfe2dc | 823 | EXPORT_SYMBOL_GPL(kobj_sysfs_ops); |
1da177e4 | 824 | |
1da177e4 | 825 | /** |
e374a2bf GKH |
826 | * kset_register - initialize and add a kset. |
827 | * @k: kset. | |
1da177e4 | 828 | */ |
e374a2bf | 829 | int kset_register(struct kset *k) |
1da177e4 | 830 | { |
80f03e34 KS |
831 | int err; |
832 | ||
31b9025a GKH |
833 | if (!k) |
834 | return -EINVAL; | |
80f03e34 | 835 | |
1da177e4 | 836 | kset_init(k); |
12e339ac | 837 | err = kobject_add_internal(&k->kobj); |
80f03e34 KS |
838 | if (err) |
839 | return err; | |
840 | kobject_uevent(&k->kobj, KOBJ_ADD); | |
841 | return 0; | |
1da177e4 | 842 | } |
fa40ae34 | 843 | EXPORT_SYMBOL(kset_register); |
1da177e4 | 844 | |
1da177e4 | 845 | /** |
e374a2bf GKH |
846 | * kset_unregister - remove a kset. |
847 | * @k: kset. | |
1da177e4 | 848 | */ |
e374a2bf | 849 | void kset_unregister(struct kset *k) |
1da177e4 | 850 | { |
31b9025a GKH |
851 | if (!k) |
852 | return; | |
35a5fe69 | 853 | kobject_del(&k->kobj); |
78a2d906 | 854 | kobject_put(&k->kobj); |
1da177e4 | 855 | } |
fa40ae34 | 856 | EXPORT_SYMBOL(kset_unregister); |
1da177e4 | 857 | |
1da177e4 | 858 | /** |
e374a2bf GKH |
859 | * kset_find_obj - search for object in kset. |
860 | * @kset: kset we're looking in. | |
861 | * @name: object's name. | |
1da177e4 | 862 | * |
e374a2bf GKH |
863 | * Lock kset via @kset->subsys, and iterate over @kset->list, |
864 | * looking for a matching kobject. If matching object is found | |
865 | * take a reference and return the object. | |
1da177e4 | 866 | */ |
e374a2bf | 867 | struct kobject *kset_find_obj(struct kset *kset, const char *name) |
1da177e4 | 868 | { |
c6a2a3dc | 869 | struct kobject *k; |
e374a2bf | 870 | struct kobject *ret = NULL; |
1da177e4 LT |
871 | |
872 | spin_lock(&kset->list_lock); | |
c25d1dfb | 873 | |
c6a2a3dc | 874 | list_for_each_entry(k, &kset->list, entry) { |
e374a2bf | 875 | if (kobject_name(k) && !strcmp(kobject_name(k), name)) { |
a49b7e82 | 876 | ret = kobject_get_unless_zero(k); |
1da177e4 LT |
877 | break; |
878 | } | |
879 | } | |
c25d1dfb | 880 | |
1da177e4 LT |
881 | spin_unlock(&kset->list_lock); |
882 | return ret; | |
883 | } | |
2fe829ac | 884 | EXPORT_SYMBOL_GPL(kset_find_obj); |
1da177e4 | 885 | |
b727c702 GKH |
886 | static void kset_release(struct kobject *kobj) |
887 | { | |
888 | struct kset *kset = container_of(kobj, struct kset, kobj); | |
9f66fa2a | 889 | pr_debug("kobject: '%s' (%p): %s\n", |
810304db | 890 | kobject_name(kobj), kobj, __func__); |
b727c702 GKH |
891 | kfree(kset); |
892 | } | |
893 | ||
d2562922 DT |
894 | void kset_get_ownership(struct kobject *kobj, kuid_t *uid, kgid_t *gid) |
895 | { | |
896 | if (kobj->parent) | |
897 | kobject_get_ownership(kobj->parent, uid, gid); | |
898 | } | |
899 | ||
386f275f KS |
900 | static struct kobj_type kset_ktype = { |
901 | .sysfs_ops = &kobj_sysfs_ops, | |
d2562922 DT |
902 | .release = kset_release, |
903 | .get_ownership = kset_get_ownership, | |
b727c702 GKH |
904 | }; |
905 | ||
906 | /** | |
907 | * kset_create - create a struct kset dynamically | |
908 | * | |
909 | * @name: the name for the kset | |
910 | * @uevent_ops: a struct kset_uevent_ops for the kset | |
911 | * @parent_kobj: the parent kobject of this kset, if any. | |
912 | * | |
913 | * This function creates a kset structure dynamically. This structure can | |
914 | * then be registered with the system and show up in sysfs with a call to | |
915 | * kset_register(). When you are finished with this structure, if | |
916 | * kset_register() has been called, call kset_unregister() and the | |
917 | * structure will be dynamically freed when it is no longer being used. | |
918 | * | |
919 | * If the kset was not able to be created, NULL will be returned. | |
920 | */ | |
921 | static struct kset *kset_create(const char *name, | |
9cd43611 | 922 | const struct kset_uevent_ops *uevent_ops, |
b727c702 GKH |
923 | struct kobject *parent_kobj) |
924 | { | |
925 | struct kset *kset; | |
d9cd8f37 | 926 | int retval; |
b727c702 GKH |
927 | |
928 | kset = kzalloc(sizeof(*kset), GFP_KERNEL); | |
929 | if (!kset) | |
930 | return NULL; | |
b7165ebb | 931 | retval = kobject_set_name(&kset->kobj, "%s", name); |
d9cd8f37 DY |
932 | if (retval) { |
933 | kfree(kset); | |
934 | return NULL; | |
935 | } | |
b727c702 GKH |
936 | kset->uevent_ops = uevent_ops; |
937 | kset->kobj.parent = parent_kobj; | |
938 | ||
939 | /* | |
386f275f | 940 | * The kobject of this kset will have a type of kset_ktype and belong to |
b727c702 GKH |
941 | * no kset itself. That way we can properly free it when it is |
942 | * finished being used. | |
943 | */ | |
386f275f | 944 | kset->kobj.ktype = &kset_ktype; |
b727c702 GKH |
945 | kset->kobj.kset = NULL; |
946 | ||
947 | return kset; | |
948 | } | |
949 | ||
950 | /** | |
951 | * kset_create_and_add - create a struct kset dynamically and add it to sysfs | |
952 | * | |
953 | * @name: the name for the kset | |
954 | * @uevent_ops: a struct kset_uevent_ops for the kset | |
955 | * @parent_kobj: the parent kobject of this kset, if any. | |
956 | * | |
957 | * This function creates a kset structure dynamically and registers it | |
958 | * with sysfs. When you are finished with this structure, call | |
959 | * kset_unregister() and the structure will be dynamically freed when it | |
960 | * is no longer being used. | |
961 | * | |
962 | * If the kset was not able to be created, NULL will be returned. | |
963 | */ | |
964 | struct kset *kset_create_and_add(const char *name, | |
9cd43611 | 965 | const struct kset_uevent_ops *uevent_ops, |
b727c702 GKH |
966 | struct kobject *parent_kobj) |
967 | { | |
968 | struct kset *kset; | |
969 | int error; | |
970 | ||
971 | kset = kset_create(name, uevent_ops, parent_kobj); | |
972 | if (!kset) | |
973 | return NULL; | |
974 | error = kset_register(kset); | |
975 | if (error) { | |
976 | kfree(kset); | |
977 | return NULL; | |
978 | } | |
979 | return kset; | |
980 | } | |
981 | EXPORT_SYMBOL_GPL(kset_create_and_add); | |
982 | ||
bc451f20 EB |
983 | |
984 | static DEFINE_SPINLOCK(kobj_ns_type_lock); | |
985 | static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES]; | |
986 | ||
987 | int kobj_ns_type_register(const struct kobj_ns_type_operations *ops) | |
988 | { | |
989 | enum kobj_ns_type type = ops->type; | |
990 | int error; | |
991 | ||
992 | spin_lock(&kobj_ns_type_lock); | |
993 | ||
994 | error = -EINVAL; | |
995 | if (type >= KOBJ_NS_TYPES) | |
996 | goto out; | |
997 | ||
998 | error = -EINVAL; | |
999 | if (type <= KOBJ_NS_TYPE_NONE) | |
1000 | goto out; | |
1001 | ||
1002 | error = -EBUSY; | |
1003 | if (kobj_ns_ops_tbl[type]) | |
1004 | goto out; | |
1005 | ||
1006 | error = 0; | |
1007 | kobj_ns_ops_tbl[type] = ops; | |
1008 | ||
1009 | out: | |
1010 | spin_unlock(&kobj_ns_type_lock); | |
1011 | return error; | |
1012 | } | |
1013 | ||
1014 | int kobj_ns_type_registered(enum kobj_ns_type type) | |
1015 | { | |
1016 | int registered = 0; | |
1017 | ||
1018 | spin_lock(&kobj_ns_type_lock); | |
1019 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES)) | |
1020 | registered = kobj_ns_ops_tbl[type] != NULL; | |
1021 | spin_unlock(&kobj_ns_type_lock); | |
1022 | ||
1023 | return registered; | |
1024 | } | |
1025 | ||
1026 | const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent) | |
1027 | { | |
1028 | const struct kobj_ns_type_operations *ops = NULL; | |
1029 | ||
41fb96a4 | 1030 | if (parent && parent->ktype && parent->ktype->child_ns_type) |
bc451f20 EB |
1031 | ops = parent->ktype->child_ns_type(parent); |
1032 | ||
1033 | return ops; | |
1034 | } | |
1035 | ||
1036 | const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj) | |
1037 | { | |
1038 | return kobj_child_ns_ops(kobj->parent); | |
1039 | } | |
1040 | ||
7dc5dbc8 EB |
1041 | bool kobj_ns_current_may_mount(enum kobj_ns_type type) |
1042 | { | |
730d7d33 | 1043 | bool may_mount = true; |
7dc5dbc8 EB |
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 | may_mount = kobj_ns_ops_tbl[type]->current_may_mount(); | |
1049 | spin_unlock(&kobj_ns_type_lock); | |
1050 | ||
1051 | return may_mount; | |
1052 | } | |
bc451f20 | 1053 | |
a685e089 | 1054 | void *kobj_ns_grab_current(enum kobj_ns_type type) |
bc451f20 | 1055 | { |
a685e089 | 1056 | void *ns = NULL; |
bc451f20 EB |
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]) | |
a685e089 | 1061 | ns = kobj_ns_ops_tbl[type]->grab_current_ns(); |
bc451f20 EB |
1062 | spin_unlock(&kobj_ns_type_lock); |
1063 | ||
1064 | return ns; | |
1065 | } | |
1066 | ||
1067 | const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk) | |
1068 | { | |
1069 | const void *ns = NULL; | |
1070 | ||
1071 | spin_lock(&kobj_ns_type_lock); | |
1072 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1073 | kobj_ns_ops_tbl[type]) | |
1074 | ns = kobj_ns_ops_tbl[type]->netlink_ns(sk); | |
1075 | spin_unlock(&kobj_ns_type_lock); | |
1076 | ||
1077 | return ns; | |
1078 | } | |
1079 | ||
1080 | const void *kobj_ns_initial(enum kobj_ns_type type) | |
1081 | { | |
1082 | const void *ns = NULL; | |
1083 | ||
1084 | spin_lock(&kobj_ns_type_lock); | |
1085 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1086 | kobj_ns_ops_tbl[type]) | |
1087 | ns = kobj_ns_ops_tbl[type]->initial_ns(); | |
1088 | spin_unlock(&kobj_ns_type_lock); | |
1089 | ||
1090 | return ns; | |
1091 | } | |
1092 | ||
a685e089 | 1093 | void kobj_ns_drop(enum kobj_ns_type type, void *ns) |
bc451f20 | 1094 | { |
a685e089 AV |
1095 | spin_lock(&kobj_ns_type_lock); |
1096 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && | |
1097 | kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns) | |
1098 | kobj_ns_ops_tbl[type]->drop_ns(ns); | |
1099 | spin_unlock(&kobj_ns_type_lock); | |
bc451f20 | 1100 | } |