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Source at commit be977234bfb4a6dca8a39e7c52165e4cd536ad71 created 12 years 9 months ago. By Lars-Peter Clausen, jz4740: Fix compile error | |
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1 | /* |
2 | * kobject.c - library routines for handling generic kernel objects |
3 | * |
4 | * Copyright (c) 2002-2003 Patrick Mochel <mochel@osdl.org> |
5 | * Copyright (c) 2006-2007 Greg Kroah-Hartman <greg@kroah.com> |
6 | * Copyright (c) 2006-2007 Novell Inc. |
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> |
17 | #include <linux/module.h> |
18 | #include <linux/stat.h> |
19 | #include <linux/slab.h> |
20 | |
21 | /* |
22 | * populate_dir - populate directory with attributes. |
23 | * @kobj: object we're working on. |
24 | * |
25 | * Most subsystems have a set of default attributes that are associated |
26 | * with an object that registers with them. This is a helper called during |
27 | * object registration that loops through the default attributes of the |
28 | * subsystem and creates attributes files for them in sysfs. |
29 | */ |
30 | static int populate_dir(struct kobject *kobj) |
31 | { |
32 | struct kobj_type *t = get_ktype(kobj); |
33 | struct attribute *attr; |
34 | int error = 0; |
35 | int i; |
36 | |
37 | if (t && t->default_attrs) { |
38 | for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) { |
39 | error = sysfs_create_file(kobj, attr); |
40 | if (error) |
41 | break; |
42 | } |
43 | } |
44 | return error; |
45 | } |
46 | |
47 | static int create_dir(struct kobject *kobj) |
48 | { |
49 | int error = 0; |
50 | if (kobject_name(kobj)) { |
51 | error = sysfs_create_dir(kobj); |
52 | if (!error) { |
53 | error = populate_dir(kobj); |
54 | if (error) |
55 | sysfs_remove_dir(kobj); |
56 | } |
57 | } |
58 | return error; |
59 | } |
60 | |
61 | static int get_kobj_path_length(struct kobject *kobj) |
62 | { |
63 | int length = 1; |
64 | struct kobject *parent = kobj; |
65 | |
66 | /* walk up the ancestors until we hit the one pointing to the |
67 | * root. |
68 | * Add 1 to strlen for leading '/' of each level. |
69 | */ |
70 | do { |
71 | if (kobject_name(parent) == NULL) |
72 | return 0; |
73 | length += strlen(kobject_name(parent)) + 1; |
74 | parent = parent->parent; |
75 | } while (parent); |
76 | return length; |
77 | } |
78 | |
79 | static void fill_kobj_path(struct kobject *kobj, char *path, int length) |
80 | { |
81 | struct kobject *parent; |
82 | |
83 | --length; |
84 | for (parent = kobj; parent; parent = parent->parent) { |
85 | int cur = strlen(kobject_name(parent)); |
86 | /* back up enough to print this name with '/' */ |
87 | length -= cur; |
88 | strncpy(path + length, kobject_name(parent), cur); |
89 | *(path + --length) = '/'; |
90 | } |
91 | |
92 | pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj), |
93 | kobj, __func__, path); |
94 | } |
95 | |
96 | /** |
97 | * kobject_get_path - generate and return the path associated with a given kobj and kset pair. |
98 | * |
99 | * @kobj: kobject in question, with which to build the path |
100 | * @gfp_mask: the allocation type used to allocate the path |
101 | * |
102 | * The result must be freed by the caller with kfree(). |
103 | */ |
104 | char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask) |
105 | { |
106 | char *path; |
107 | int len; |
108 | |
109 | len = get_kobj_path_length(kobj); |
110 | if (len == 0) |
111 | return NULL; |
112 | path = kzalloc(len, gfp_mask); |
113 | if (!path) |
114 | return NULL; |
115 | fill_kobj_path(kobj, path, len); |
116 | |
117 | return path; |
118 | } |
119 | EXPORT_SYMBOL_GPL(kobject_get_path); |
120 | |
121 | /* add the kobject to its kset's list */ |
122 | static void kobj_kset_join(struct kobject *kobj) |
123 | { |
124 | if (!kobj->kset) |
125 | return; |
126 | |
127 | kset_get(kobj->kset); |
128 | spin_lock(&kobj->kset->list_lock); |
129 | list_add_tail(&kobj->entry, &kobj->kset->list); |
130 | spin_unlock(&kobj->kset->list_lock); |
131 | } |
132 | |
133 | /* remove the kobject from its kset's list */ |
134 | static void kobj_kset_leave(struct kobject *kobj) |
135 | { |
136 | if (!kobj->kset) |
137 | return; |
138 | |
139 | spin_lock(&kobj->kset->list_lock); |
140 | list_del_init(&kobj->entry); |
141 | spin_unlock(&kobj->kset->list_lock); |
142 | kset_put(kobj->kset); |
143 | } |
144 | |
145 | static void kobject_init_internal(struct kobject *kobj) |
146 | { |
147 | if (!kobj) |
148 | return; |
149 | kref_init(&kobj->kref); |
150 | INIT_LIST_HEAD(&kobj->entry); |
151 | kobj->state_in_sysfs = 0; |
152 | kobj->state_add_uevent_sent = 0; |
153 | kobj->state_remove_uevent_sent = 0; |
154 | kobj->state_initialized = 1; |
155 | } |
156 | |
157 | |
158 | static int kobject_add_internal(struct kobject *kobj) |
159 | { |
160 | int error = 0; |
161 | struct kobject *parent; |
162 | |
163 | if (!kobj) |
164 | return -ENOENT; |
165 | |
166 | if (!kobj->name || !kobj->name[0]) { |
167 | WARN(1, "kobject: (%p): attempted to be registered with empty " |
168 | "name!\n", kobj); |
169 | return -EINVAL; |
170 | } |
171 | |
172 | parent = kobject_get(kobj->parent); |
173 | |
174 | /* join kset if set, use it as parent if we do not already have one */ |
175 | if (kobj->kset) { |
176 | if (!parent) |
177 | parent = kobject_get(&kobj->kset->kobj); |
178 | kobj_kset_join(kobj); |
179 | kobj->parent = parent; |
180 | } |
181 | |
182 | pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n", |
183 | kobject_name(kobj), kobj, __func__, |
184 | parent ? kobject_name(parent) : "<NULL>", |
185 | kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>"); |
186 | |
187 | error = create_dir(kobj); |
188 | if (error) { |
189 | kobj_kset_leave(kobj); |
190 | kobject_put(parent); |
191 | kobj->parent = NULL; |
192 | |
193 | /* be noisy on error issues */ |
194 | if (error == -EEXIST) |
195 | printk(KERN_ERR "%s failed for %s with " |
196 | "-EEXIST, don't try to register things with " |
197 | "the same name in the same directory.\n", |
198 | __func__, kobject_name(kobj)); |
199 | else |
200 | printk(KERN_ERR "%s failed for %s (%d)\n", |
201 | __func__, kobject_name(kobj), error); |
202 | dump_stack(); |
203 | } else |
204 | kobj->state_in_sysfs = 1; |
205 | |
206 | return error; |
207 | } |
208 | |
209 | /** |
210 | * kobject_set_name_vargs - Set the name of an kobject |
211 | * @kobj: struct kobject to set the name of |
212 | * @fmt: format string used to build the name |
213 | * @vargs: vargs to format the string. |
214 | */ |
215 | int kobject_set_name_vargs(struct kobject *kobj, const char *fmt, |
216 | va_list vargs) |
217 | { |
218 | const char *old_name = kobj->name; |
219 | char *s; |
220 | |
221 | if (kobj->name && !fmt) |
222 | return 0; |
223 | |
224 | kobj->name = kvasprintf(GFP_KERNEL, fmt, vargs); |
225 | if (!kobj->name) |
226 | return -ENOMEM; |
227 | |
228 | /* ewww... some of these buggers have '/' in the name ... */ |
229 | while ((s = strchr(kobj->name, '/'))) |
230 | s[0] = '!'; |
231 | |
232 | kfree(old_name); |
233 | return 0; |
234 | } |
235 | |
236 | /** |
237 | * kobject_set_name - Set the name of a kobject |
238 | * @kobj: struct kobject to set the name of |
239 | * @fmt: format string used to build the name |
240 | * |
241 | * This sets the name of the kobject. If you have already added the |
242 | * kobject to the system, you must call kobject_rename() in order to |
243 | * change the name of the kobject. |
244 | */ |
245 | int kobject_set_name(struct kobject *kobj, const char *fmt, ...) |
246 | { |
247 | va_list vargs; |
248 | int retval; |
249 | |
250 | va_start(vargs, fmt); |
251 | retval = kobject_set_name_vargs(kobj, fmt, vargs); |
252 | va_end(vargs); |
253 | |
254 | return retval; |
255 | } |
256 | EXPORT_SYMBOL(kobject_set_name); |
257 | |
258 | /** |
259 | * kobject_init - initialize a kobject structure |
260 | * @kobj: pointer to the kobject to initialize |
261 | * @ktype: pointer to the ktype for this kobject. |
262 | * |
263 | * This function will properly initialize a kobject such that it can then |
264 | * be passed to the kobject_add() call. |
265 | * |
266 | * After this function is called, the kobject MUST be cleaned up by a call |
267 | * to kobject_put(), not by a call to kfree directly to ensure that all of |
268 | * the memory is cleaned up properly. |
269 | */ |
270 | void kobject_init(struct kobject *kobj, struct kobj_type *ktype) |
271 | { |
272 | char *err_str; |
273 | |
274 | if (!kobj) { |
275 | err_str = "invalid kobject pointer!"; |
276 | goto error; |
277 | } |
278 | if (!ktype) { |
279 | err_str = "must have a ktype to be initialized properly!\n"; |
280 | goto error; |
281 | } |
282 | if (kobj->state_initialized) { |
283 | /* do not error out as sometimes we can recover */ |
284 | printk(KERN_ERR "kobject (%p): tried to init an initialized " |
285 | "object, something is seriously wrong.\n", kobj); |
286 | dump_stack(); |
287 | } |
288 | |
289 | kobject_init_internal(kobj); |
290 | kobj->ktype = ktype; |
291 | return; |
292 | |
293 | error: |
294 | printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str); |
295 | dump_stack(); |
296 | } |
297 | EXPORT_SYMBOL(kobject_init); |
298 | |
299 | static int kobject_add_varg(struct kobject *kobj, struct kobject *parent, |
300 | const char *fmt, va_list vargs) |
301 | { |
302 | int retval; |
303 | |
304 | retval = kobject_set_name_vargs(kobj, fmt, vargs); |
305 | if (retval) { |
306 | printk(KERN_ERR "kobject: can not set name properly!\n"); |
307 | return retval; |
308 | } |
309 | kobj->parent = parent; |
310 | return kobject_add_internal(kobj); |
311 | } |
312 | |
313 | /** |
314 | * kobject_add - the main kobject add function |
315 | * @kobj: the kobject to add |
316 | * @parent: pointer to the parent of the kobject. |
317 | * @fmt: format to name the kobject with. |
318 | * |
319 | * The kobject name is set and added to the kobject hierarchy in this |
320 | * function. |
321 | * |
322 | * If @parent is set, then the parent of the @kobj will be set to it. |
323 | * If @parent is NULL, then the parent of the @kobj will be set to the |
324 | * kobject associted with the kset assigned to this kobject. If no kset |
325 | * is assigned to the kobject, then the kobject will be located in the |
326 | * root of the sysfs tree. |
327 | * |
328 | * If this function returns an error, kobject_put() must be called to |
329 | * properly clean up the memory associated with the object. |
330 | * Under no instance should the kobject that is passed to this function |
331 | * be directly freed with a call to kfree(), that can leak memory. |
332 | * |
333 | * Note, no "add" uevent will be created with this call, the caller should set |
334 | * up all of the necessary sysfs files for the object and then call |
335 | * kobject_uevent() with the UEVENT_ADD parameter to ensure that |
336 | * userspace is properly notified of this kobject's creation. |
337 | */ |
338 | int kobject_add(struct kobject *kobj, struct kobject *parent, |
339 | const char *fmt, ...) |
340 | { |
341 | va_list args; |
342 | int retval; |
343 | |
344 | if (!kobj) |
345 | return -EINVAL; |
346 | |
347 | if (!kobj->state_initialized) { |
348 | printk(KERN_ERR "kobject '%s' (%p): tried to add an " |
349 | "uninitialized object, something is seriously wrong.\n", |
350 | kobject_name(kobj), kobj); |
351 | dump_stack(); |
352 | return -EINVAL; |
353 | } |
354 | va_start(args, fmt); |
355 | retval = kobject_add_varg(kobj, parent, fmt, args); |
356 | va_end(args); |
357 | |
358 | return retval; |
359 | } |
360 | EXPORT_SYMBOL(kobject_add); |
361 | |
362 | /** |
363 | * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy |
364 | * @kobj: pointer to the kobject to initialize |
365 | * @ktype: pointer to the ktype for this kobject. |
366 | * @parent: pointer to the parent of this kobject. |
367 | * @fmt: the name of the kobject. |
368 | * |
369 | * This function combines the call to kobject_init() and |
370 | * kobject_add(). The same type of error handling after a call to |
371 | * kobject_add() and kobject lifetime rules are the same here. |
372 | */ |
373 | int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype, |
374 | struct kobject *parent, const char *fmt, ...) |
375 | { |
376 | va_list args; |
377 | int retval; |
378 | |
379 | kobject_init(kobj, ktype); |
380 | |
381 | va_start(args, fmt); |
382 | retval = kobject_add_varg(kobj, parent, fmt, args); |
383 | va_end(args); |
384 | |
385 | return retval; |
386 | } |
387 | EXPORT_SYMBOL_GPL(kobject_init_and_add); |
388 | |
389 | /** |
390 | * kobject_rename - change the name of an object |
391 | * @kobj: object in question. |
392 | * @new_name: object's new name |
393 | * |
394 | * It is the responsibility of the caller to provide mutual |
395 | * exclusion between two different calls of kobject_rename |
396 | * on the same kobject and to ensure that new_name is valid and |
397 | * won't conflict with other kobjects. |
398 | */ |
399 | int kobject_rename(struct kobject *kobj, const char *new_name) |
400 | { |
401 | int error = 0; |
402 | const char *devpath = NULL; |
403 | const char *dup_name = NULL, *name; |
404 | char *devpath_string = NULL; |
405 | char *envp[2]; |
406 | |
407 | kobj = kobject_get(kobj); |
408 | if (!kobj) |
409 | return -EINVAL; |
410 | if (!kobj->parent) |
411 | return -EINVAL; |
412 | |
413 | devpath = kobject_get_path(kobj, GFP_KERNEL); |
414 | if (!devpath) { |
415 | error = -ENOMEM; |
416 | goto out; |
417 | } |
418 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); |
419 | if (!devpath_string) { |
420 | error = -ENOMEM; |
421 | goto out; |
422 | } |
423 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); |
424 | envp[0] = devpath_string; |
425 | envp[1] = NULL; |
426 | |
427 | name = dup_name = kstrdup(new_name, GFP_KERNEL); |
428 | if (!name) { |
429 | error = -ENOMEM; |
430 | goto out; |
431 | } |
432 | |
433 | error = sysfs_rename_dir(kobj, new_name); |
434 | if (error) |
435 | goto out; |
436 | |
437 | /* Install the new kobject name */ |
438 | dup_name = kobj->name; |
439 | kobj->name = name; |
440 | |
441 | /* This function is mostly/only used for network interface. |
442 | * Some hotplug package track interfaces by their name and |
443 | * therefore want to know when the name is changed by the user. */ |
444 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); |
445 | |
446 | out: |
447 | kfree(dup_name); |
448 | kfree(devpath_string); |
449 | kfree(devpath); |
450 | kobject_put(kobj); |
451 | |
452 | return error; |
453 | } |
454 | EXPORT_SYMBOL_GPL(kobject_rename); |
455 | |
456 | /** |
457 | * kobject_move - move object to another parent |
458 | * @kobj: object in question. |
459 | * @new_parent: object's new parent (can be NULL) |
460 | */ |
461 | int kobject_move(struct kobject *kobj, struct kobject *new_parent) |
462 | { |
463 | int error; |
464 | struct kobject *old_parent; |
465 | const char *devpath = NULL; |
466 | char *devpath_string = NULL; |
467 | char *envp[2]; |
468 | |
469 | kobj = kobject_get(kobj); |
470 | if (!kobj) |
471 | return -EINVAL; |
472 | new_parent = kobject_get(new_parent); |
473 | if (!new_parent) { |
474 | if (kobj->kset) |
475 | new_parent = kobject_get(&kobj->kset->kobj); |
476 | } |
477 | /* old object path */ |
478 | devpath = kobject_get_path(kobj, GFP_KERNEL); |
479 | if (!devpath) { |
480 | error = -ENOMEM; |
481 | goto out; |
482 | } |
483 | devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); |
484 | if (!devpath_string) { |
485 | error = -ENOMEM; |
486 | goto out; |
487 | } |
488 | sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); |
489 | envp[0] = devpath_string; |
490 | envp[1] = NULL; |
491 | error = sysfs_move_dir(kobj, new_parent); |
492 | if (error) |
493 | goto out; |
494 | old_parent = kobj->parent; |
495 | kobj->parent = new_parent; |
496 | new_parent = NULL; |
497 | kobject_put(old_parent); |
498 | kobject_uevent_env(kobj, KOBJ_MOVE, envp); |
499 | out: |
500 | kobject_put(new_parent); |
501 | kobject_put(kobj); |
502 | kfree(devpath_string); |
503 | kfree(devpath); |
504 | return error; |
505 | } |
506 | |
507 | /** |
508 | * kobject_del - unlink kobject from hierarchy. |
509 | * @kobj: object. |
510 | */ |
511 | void kobject_del(struct kobject *kobj) |
512 | { |
513 | if (!kobj) |
514 | return; |
515 | |
516 | sysfs_remove_dir(kobj); |
517 | kobj->state_in_sysfs = 0; |
518 | kobj_kset_leave(kobj); |
519 | kobject_put(kobj->parent); |
520 | kobj->parent = NULL; |
521 | } |
522 | |
523 | /** |
524 | * kobject_get - increment refcount for object. |
525 | * @kobj: object. |
526 | */ |
527 | struct kobject *kobject_get(struct kobject *kobj) |
528 | { |
529 | if (kobj) |
530 | kref_get(&kobj->kref); |
531 | return kobj; |
532 | } |
533 | |
534 | /* |
535 | * kobject_cleanup - free kobject resources. |
536 | * @kobj: object to cleanup |
537 | */ |
538 | static void kobject_cleanup(struct kobject *kobj) |
539 | { |
540 | struct kobj_type *t = get_ktype(kobj); |
541 | const char *name = kobj->name; |
542 | |
543 | pr_debug("kobject: '%s' (%p): %s\n", |
544 | kobject_name(kobj), kobj, __func__); |
545 | |
546 | if (t && !t->release) |
547 | pr_debug("kobject: '%s' (%p): does not have a release() " |
548 | "function, it is broken and must be fixed.\n", |
549 | kobject_name(kobj), kobj); |
550 | |
551 | /* send "remove" if the caller did not do it but sent "add" */ |
552 | if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) { |
553 | pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n", |
554 | kobject_name(kobj), kobj); |
555 | kobject_uevent(kobj, KOBJ_REMOVE); |
556 | } |
557 | |
558 | /* remove from sysfs if the caller did not do it */ |
559 | if (kobj->state_in_sysfs) { |
560 | pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n", |
561 | kobject_name(kobj), kobj); |
562 | kobject_del(kobj); |
563 | } |
564 | |
565 | if (t && t->release) { |
566 | pr_debug("kobject: '%s' (%p): calling ktype release\n", |
567 | kobject_name(kobj), kobj); |
568 | t->release(kobj); |
569 | } |
570 | |
571 | /* free name if we allocated it */ |
572 | if (name) { |
573 | pr_debug("kobject: '%s': free name\n", name); |
574 | kfree(name); |
575 | } |
576 | } |
577 | |
578 | static void kobject_release(struct kref *kref) |
579 | { |
580 | kobject_cleanup(container_of(kref, struct kobject, kref)); |
581 | } |
582 | |
583 | /** |
584 | * kobject_put - decrement refcount for object. |
585 | * @kobj: object. |
586 | * |
587 | * Decrement the refcount, and if 0, call kobject_cleanup(). |
588 | */ |
589 | void kobject_put(struct kobject *kobj) |
590 | { |
591 | if (kobj) { |
592 | if (!kobj->state_initialized) |
593 | WARN(1, KERN_WARNING "kobject: '%s' (%p): is not " |
594 | "initialized, yet kobject_put() is being " |
595 | "called.\n", kobject_name(kobj), kobj); |
596 | kref_put(&kobj->kref, kobject_release); |
597 | } |
598 | } |
599 | |
600 | static void dynamic_kobj_release(struct kobject *kobj) |
601 | { |
602 | pr_debug("kobject: (%p): %s\n", kobj, __func__); |
603 | kfree(kobj); |
604 | } |
605 | |
606 | static struct kobj_type dynamic_kobj_ktype = { |
607 | .release = dynamic_kobj_release, |
608 | .sysfs_ops = &kobj_sysfs_ops, |
609 | }; |
610 | |
611 | /** |
612 | * kobject_create - create a struct kobject dynamically |
613 | * |
614 | * This function creates a kobject structure dynamically and sets it up |
615 | * to be a "dynamic" kobject with a default release function set up. |
616 | * |
617 | * If the kobject was not able to be created, NULL will be returned. |
618 | * The kobject structure returned from here must be cleaned up with a |
619 | * call to kobject_put() and not kfree(), as kobject_init() has |
620 | * already been called on this structure. |
621 | */ |
622 | struct kobject *kobject_create(void) |
623 | { |
624 | struct kobject *kobj; |
625 | |
626 | kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); |
627 | if (!kobj) |
628 | return NULL; |
629 | |
630 | kobject_init(kobj, &dynamic_kobj_ktype); |
631 | return kobj; |
632 | } |
633 | |
634 | /** |
635 | * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs |
636 | * |
637 | * @name: the name for the kset |
638 | * @parent: the parent kobject of this kobject, if any. |
639 | * |
640 | * This function creates a kobject structure dynamically and registers it |
641 | * with sysfs. When you are finished with this structure, call |
642 | * kobject_put() and the structure will be dynamically freed when |
643 | * it is no longer being used. |
644 | * |
645 | * If the kobject was not able to be created, NULL will be returned. |
646 | */ |
647 | struct kobject *kobject_create_and_add(const char *name, struct kobject *parent) |
648 | { |
649 | struct kobject *kobj; |
650 | int retval; |
651 | |
652 | kobj = kobject_create(); |
653 | if (!kobj) |
654 | return NULL; |
655 | |
656 | retval = kobject_add(kobj, parent, "%s", name); |
657 | if (retval) { |
658 | printk(KERN_WARNING "%s: kobject_add error: %d\n", |
659 | __func__, retval); |
660 | kobject_put(kobj); |
661 | kobj = NULL; |
662 | } |
663 | return kobj; |
664 | } |
665 | EXPORT_SYMBOL_GPL(kobject_create_and_add); |
666 | |
667 | /** |
668 | * kset_init - initialize a kset for use |
669 | * @k: kset |
670 | */ |
671 | void kset_init(struct kset *k) |
672 | { |
673 | kobject_init_internal(&k->kobj); |
674 | INIT_LIST_HEAD(&k->list); |
675 | spin_lock_init(&k->list_lock); |
676 | } |
677 | |
678 | /* default kobject attribute operations */ |
679 | static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr, |
680 | char *buf) |
681 | { |
682 | struct kobj_attribute *kattr; |
683 | ssize_t ret = -EIO; |
684 | |
685 | kattr = container_of(attr, struct kobj_attribute, attr); |
686 | if (kattr->show) |
687 | ret = kattr->show(kobj, kattr, buf); |
688 | return ret; |
689 | } |
690 | |
691 | static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr, |
692 | const char *buf, size_t count) |
693 | { |
694 | struct kobj_attribute *kattr; |
695 | ssize_t ret = -EIO; |
696 | |
697 | kattr = container_of(attr, struct kobj_attribute, attr); |
698 | if (kattr->store) |
699 | ret = kattr->store(kobj, kattr, buf, count); |
700 | return ret; |
701 | } |
702 | |
703 | const struct sysfs_ops kobj_sysfs_ops = { |
704 | .show = kobj_attr_show, |
705 | .store = kobj_attr_store, |
706 | }; |
707 | |
708 | /** |
709 | * kset_register - initialize and add a kset. |
710 | * @k: kset. |
711 | */ |
712 | int kset_register(struct kset *k) |
713 | { |
714 | int err; |
715 | |
716 | if (!k) |
717 | return -EINVAL; |
718 | |
719 | kset_init(k); |
720 | err = kobject_add_internal(&k->kobj); |
721 | if (err) |
722 | return err; |
723 | kobject_uevent(&k->kobj, KOBJ_ADD); |
724 | return 0; |
725 | } |
726 | |
727 | /** |
728 | * kset_unregister - remove a kset. |
729 | * @k: kset. |
730 | */ |
731 | void kset_unregister(struct kset *k) |
732 | { |
733 | if (!k) |
734 | return; |
735 | kobject_put(&k->kobj); |
736 | } |
737 | |
738 | /** |
739 | * kset_find_obj - search for object in kset. |
740 | * @kset: kset we're looking in. |
741 | * @name: object's name. |
742 | * |
743 | * Lock kset via @kset->subsys, and iterate over @kset->list, |
744 | * looking for a matching kobject. If matching object is found |
745 | * take a reference and return the object. |
746 | */ |
747 | struct kobject *kset_find_obj(struct kset *kset, const char *name) |
748 | { |
749 | return kset_find_obj_hinted(kset, name, NULL); |
750 | } |
751 | |
752 | /** |
753 | * kset_find_obj_hinted - search for object in kset given a predecessor hint. |
754 | * @kset: kset we're looking in. |
755 | * @name: object's name. |
756 | * @hint: hint to possible object's predecessor. |
757 | * |
758 | * Check the hint's next object and if it is a match return it directly, |
759 | * otherwise, fall back to the behavior of kset_find_obj(). Either way |
760 | * a reference for the returned object is held and the reference on the |
761 | * hinted object is released. |
762 | */ |
763 | struct kobject *kset_find_obj_hinted(struct kset *kset, const char *name, |
764 | struct kobject *hint) |
765 | { |
766 | struct kobject *k; |
767 | struct kobject *ret = NULL; |
768 | |
769 | spin_lock(&kset->list_lock); |
770 | |
771 | if (!hint) |
772 | goto slow_search; |
773 | |
774 | /* end of list detection */ |
775 | if (hint->entry.next == kset->list.next) |
776 | goto slow_search; |
777 | |
778 | k = container_of(hint->entry.next, struct kobject, entry); |
779 | if (!kobject_name(k) || strcmp(kobject_name(k), name)) |
780 | goto slow_search; |
781 | |
782 | ret = kobject_get(k); |
783 | goto unlock_exit; |
784 | |
785 | slow_search: |
786 | list_for_each_entry(k, &kset->list, entry) { |
787 | if (kobject_name(k) && !strcmp(kobject_name(k), name)) { |
788 | ret = kobject_get(k); |
789 | break; |
790 | } |
791 | } |
792 | |
793 | unlock_exit: |
794 | spin_unlock(&kset->list_lock); |
795 | |
796 | if (hint) |
797 | kobject_put(hint); |
798 | |
799 | return ret; |
800 | } |
801 | |
802 | static void kset_release(struct kobject *kobj) |
803 | { |
804 | struct kset *kset = container_of(kobj, struct kset, kobj); |
805 | pr_debug("kobject: '%s' (%p): %s\n", |
806 | kobject_name(kobj), kobj, __func__); |
807 | kfree(kset); |
808 | } |
809 | |
810 | static struct kobj_type kset_ktype = { |
811 | .sysfs_ops = &kobj_sysfs_ops, |
812 | .release = kset_release, |
813 | }; |
814 | |
815 | /** |
816 | * kset_create - create a struct kset dynamically |
817 | * |
818 | * @name: the name for the kset |
819 | * @uevent_ops: a struct kset_uevent_ops for the kset |
820 | * @parent_kobj: the parent kobject of this kset, if any. |
821 | * |
822 | * This function creates a kset structure dynamically. This structure can |
823 | * then be registered with the system and show up in sysfs with a call to |
824 | * kset_register(). When you are finished with this structure, if |
825 | * kset_register() has been called, call kset_unregister() and the |
826 | * structure will be dynamically freed when it is no longer being used. |
827 | * |
828 | * If the kset was not able to be created, NULL will be returned. |
829 | */ |
830 | static struct kset *kset_create(const char *name, |
831 | const struct kset_uevent_ops *uevent_ops, |
832 | struct kobject *parent_kobj) |
833 | { |
834 | struct kset *kset; |
835 | int retval; |
836 | |
837 | kset = kzalloc(sizeof(*kset), GFP_KERNEL); |
838 | if (!kset) |
839 | return NULL; |
840 | retval = kobject_set_name(&kset->kobj, name); |
841 | if (retval) { |
842 | kfree(kset); |
843 | return NULL; |
844 | } |
845 | kset->uevent_ops = uevent_ops; |
846 | kset->kobj.parent = parent_kobj; |
847 | |
848 | /* |
849 | * The kobject of this kset will have a type of kset_ktype and belong to |
850 | * no kset itself. That way we can properly free it when it is |
851 | * finished being used. |
852 | */ |
853 | kset->kobj.ktype = &kset_ktype; |
854 | kset->kobj.kset = NULL; |
855 | |
856 | return kset; |
857 | } |
858 | |
859 | /** |
860 | * kset_create_and_add - create a struct kset dynamically and add it to sysfs |
861 | * |
862 | * @name: the name for the kset |
863 | * @uevent_ops: a struct kset_uevent_ops for the kset |
864 | * @parent_kobj: the parent kobject of this kset, if any. |
865 | * |
866 | * This function creates a kset structure dynamically and registers it |
867 | * with sysfs. When you are finished with this structure, call |
868 | * kset_unregister() and the structure will be dynamically freed when it |
869 | * is no longer being used. |
870 | * |
871 | * If the kset was not able to be created, NULL will be returned. |
872 | */ |
873 | struct kset *kset_create_and_add(const char *name, |
874 | const struct kset_uevent_ops *uevent_ops, |
875 | struct kobject *parent_kobj) |
876 | { |
877 | struct kset *kset; |
878 | int error; |
879 | |
880 | kset = kset_create(name, uevent_ops, parent_kobj); |
881 | if (!kset) |
882 | return NULL; |
883 | error = kset_register(kset); |
884 | if (error) { |
885 | kfree(kset); |
886 | return NULL; |
887 | } |
888 | return kset; |
889 | } |
890 | EXPORT_SYMBOL_GPL(kset_create_and_add); |
891 | |
892 | |
893 | static DEFINE_SPINLOCK(kobj_ns_type_lock); |
894 | static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES]; |
895 | |
896 | int kobj_ns_type_register(const struct kobj_ns_type_operations *ops) |
897 | { |
898 | enum kobj_ns_type type = ops->type; |
899 | int error; |
900 | |
901 | spin_lock(&kobj_ns_type_lock); |
902 | |
903 | error = -EINVAL; |
904 | if (type >= KOBJ_NS_TYPES) |
905 | goto out; |
906 | |
907 | error = -EINVAL; |
908 | if (type <= KOBJ_NS_TYPE_NONE) |
909 | goto out; |
910 | |
911 | error = -EBUSY; |
912 | if (kobj_ns_ops_tbl[type]) |
913 | goto out; |
914 | |
915 | error = 0; |
916 | kobj_ns_ops_tbl[type] = ops; |
917 | |
918 | out: |
919 | spin_unlock(&kobj_ns_type_lock); |
920 | return error; |
921 | } |
922 | |
923 | int kobj_ns_type_registered(enum kobj_ns_type type) |
924 | { |
925 | int registered = 0; |
926 | |
927 | spin_lock(&kobj_ns_type_lock); |
928 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES)) |
929 | registered = kobj_ns_ops_tbl[type] != NULL; |
930 | spin_unlock(&kobj_ns_type_lock); |
931 | |
932 | return registered; |
933 | } |
934 | |
935 | const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent) |
936 | { |
937 | const struct kobj_ns_type_operations *ops = NULL; |
938 | |
939 | if (parent && parent->ktype->child_ns_type) |
940 | ops = parent->ktype->child_ns_type(parent); |
941 | |
942 | return ops; |
943 | } |
944 | |
945 | const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj) |
946 | { |
947 | return kobj_child_ns_ops(kobj->parent); |
948 | } |
949 | |
950 | |
951 | const void *kobj_ns_current(enum kobj_ns_type type) |
952 | { |
953 | const void *ns = NULL; |
954 | |
955 | spin_lock(&kobj_ns_type_lock); |
956 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && |
957 | kobj_ns_ops_tbl[type]) |
958 | ns = kobj_ns_ops_tbl[type]->current_ns(); |
959 | spin_unlock(&kobj_ns_type_lock); |
960 | |
961 | return ns; |
962 | } |
963 | |
964 | const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk) |
965 | { |
966 | const void *ns = NULL; |
967 | |
968 | spin_lock(&kobj_ns_type_lock); |
969 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && |
970 | kobj_ns_ops_tbl[type]) |
971 | ns = kobj_ns_ops_tbl[type]->netlink_ns(sk); |
972 | spin_unlock(&kobj_ns_type_lock); |
973 | |
974 | return ns; |
975 | } |
976 | |
977 | const void *kobj_ns_initial(enum kobj_ns_type type) |
978 | { |
979 | const void *ns = NULL; |
980 | |
981 | spin_lock(&kobj_ns_type_lock); |
982 | if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && |
983 | kobj_ns_ops_tbl[type]) |
984 | ns = kobj_ns_ops_tbl[type]->initial_ns(); |
985 | spin_unlock(&kobj_ns_type_lock); |
986 | |
987 | return ns; |
988 | } |
989 | |
990 | /* |
991 | * kobj_ns_exit - invalidate a namespace tag |
992 | * |
993 | * @type: the namespace type (i.e. KOBJ_NS_TYPE_NET) |
994 | * @ns: the actual namespace being invalidated |
995 | * |
996 | * This is called when a tag is no longer valid. For instance, |
997 | * when a network namespace exits, it uses this helper to |
998 | * make sure no sb's sysfs_info points to the now-invalidated |
999 | * netns. |
1000 | */ |
1001 | void kobj_ns_exit(enum kobj_ns_type type, const void *ns) |
1002 | { |
1003 | sysfs_exit_ns(type, ns); |
1004 | } |
1005 | |
1006 | |
1007 | EXPORT_SYMBOL(kobject_get); |
1008 | EXPORT_SYMBOL(kobject_put); |
1009 | EXPORT_SYMBOL(kobject_del); |
1010 | |
1011 | EXPORT_SYMBOL(kset_register); |
1012 | EXPORT_SYMBOL(kset_unregister); |
1013 |
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