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1 | /* Helpers for initial module or kernel cmdline parsing |
2 | Copyright (C) 2001 Rusty Russell. |
3 | |
4 | This program is free software; you can redistribute it and/or modify |
5 | it under the terms of the GNU General Public License as published by |
6 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
8 | |
9 | This program is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | GNU General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU General Public License |
15 | along with this program; if not, write to the Free Software |
16 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
17 | */ |
18 | #include <linux/moduleparam.h> |
19 | #include <linux/kernel.h> |
20 | #include <linux/string.h> |
21 | #include <linux/errno.h> |
22 | #include <linux/module.h> |
23 | #include <linux/device.h> |
24 | #include <linux/err.h> |
25 | #include <linux/slab.h> |
26 | #include <linux/ctype.h> |
27 | |
28 | #if 0 |
29 | #define DEBUGP printk |
30 | #else |
31 | #define DEBUGP(fmt, a...) |
32 | #endif |
33 | |
34 | static inline char dash2underscore(char c) |
35 | { |
36 | if (c == '-') |
37 | return '_'; |
38 | return c; |
39 | } |
40 | |
41 | static inline int parameq(const char *input, const char *paramname) |
42 | { |
43 | unsigned int i; |
44 | for (i = 0; dash2underscore(input[i]) == paramname[i]; i++) |
45 | if (input[i] == '\0') |
46 | return 1; |
47 | return 0; |
48 | } |
49 | |
50 | static int parse_one(char *param, |
51 | char *val, |
52 | struct kernel_param *params, |
53 | unsigned num_params, |
54 | int (*handle_unknown)(char *param, char *val)) |
55 | { |
56 | unsigned int i; |
57 | |
58 | /* Find parameter */ |
59 | for (i = 0; i < num_params; i++) { |
60 | if (parameq(param, params[i].name)) { |
61 | DEBUGP("They are equal! Calling %p\n", |
62 | params[i].set); |
63 | return params[i].set(val, ¶ms[i]); |
64 | } |
65 | } |
66 | |
67 | if (handle_unknown) { |
68 | DEBUGP("Unknown argument: calling %p\n", handle_unknown); |
69 | return handle_unknown(param, val); |
70 | } |
71 | |
72 | DEBUGP("Unknown argument `%s'\n", param); |
73 | return -ENOENT; |
74 | } |
75 | |
76 | /* You can use " around spaces, but can't escape ". */ |
77 | /* Hyphens and underscores equivalent in parameter names. */ |
78 | static char *next_arg(char *args, char **param, char **val) |
79 | { |
80 | unsigned int i, equals = 0; |
81 | int in_quote = 0, quoted = 0; |
82 | char *next; |
83 | |
84 | if (*args == '"') { |
85 | args++; |
86 | in_quote = 1; |
87 | quoted = 1; |
88 | } |
89 | |
90 | for (i = 0; args[i]; i++) { |
91 | if (isspace(args[i]) && !in_quote) |
92 | break; |
93 | if (equals == 0) { |
94 | if (args[i] == '=') |
95 | equals = i; |
96 | } |
97 | if (args[i] == '"') |
98 | in_quote = !in_quote; |
99 | } |
100 | |
101 | *param = args; |
102 | if (!equals) |
103 | *val = NULL; |
104 | else { |
105 | args[equals] = '\0'; |
106 | *val = args + equals + 1; |
107 | |
108 | /* Don't include quotes in value. */ |
109 | if (**val == '"') { |
110 | (*val)++; |
111 | if (args[i-1] == '"') |
112 | args[i-1] = '\0'; |
113 | } |
114 | if (quoted && args[i-1] == '"') |
115 | args[i-1] = '\0'; |
116 | } |
117 | |
118 | if (args[i]) { |
119 | args[i] = '\0'; |
120 | next = args + i + 1; |
121 | } else |
122 | next = args + i; |
123 | |
124 | /* Chew up trailing spaces. */ |
125 | return skip_spaces(next); |
126 | } |
127 | |
128 | /* Args looks like "foo=bar,bar2 baz=fuz wiz". */ |
129 | int parse_args(const char *name, |
130 | char *args, |
131 | struct kernel_param *params, |
132 | unsigned num, |
133 | int (*unknown)(char *param, char *val)) |
134 | { |
135 | char *param, *val; |
136 | |
137 | DEBUGP("Parsing ARGS: %s\n", args); |
138 | |
139 | /* Chew leading spaces */ |
140 | args = skip_spaces(args); |
141 | |
142 | while (*args) { |
143 | int ret; |
144 | int irq_was_disabled; |
145 | |
146 | args = next_arg(args, ¶m, &val); |
147 | irq_was_disabled = irqs_disabled(); |
148 | ret = parse_one(param, val, params, num, unknown); |
149 | if (irq_was_disabled && !irqs_disabled()) { |
150 | printk(KERN_WARNING "parse_args(): option '%s' enabled " |
151 | "irq's!\n", param); |
152 | } |
153 | switch (ret) { |
154 | case -ENOENT: |
155 | printk(KERN_ERR "%s: Unknown parameter `%s'\n", |
156 | name, param); |
157 | return ret; |
158 | case -ENOSPC: |
159 | printk(KERN_ERR |
160 | "%s: `%s' too large for parameter `%s'\n", |
161 | name, val ?: "", param); |
162 | return ret; |
163 | case 0: |
164 | break; |
165 | default: |
166 | printk(KERN_ERR |
167 | "%s: `%s' invalid for parameter `%s'\n", |
168 | name, val ?: "", param); |
169 | return ret; |
170 | } |
171 | } |
172 | |
173 | /* All parsed OK. */ |
174 | return 0; |
175 | } |
176 | |
177 | /* Lazy bastard, eh? */ |
178 | #define STANDARD_PARAM_DEF(name, type, format, tmptype, strtolfn) \ |
179 | int param_set_##name(const char *val, struct kernel_param *kp) \ |
180 | { \ |
181 | tmptype l; \ |
182 | int ret; \ |
183 | \ |
184 | if (!val) return -EINVAL; \ |
185 | ret = strtolfn(val, 0, &l); \ |
186 | if (ret == -EINVAL || ((type)l != l)) \ |
187 | return -EINVAL; \ |
188 | *((type *)kp->arg) = l; \ |
189 | return 0; \ |
190 | } \ |
191 | int param_get_##name(char *buffer, struct kernel_param *kp) \ |
192 | { \ |
193 | return sprintf(buffer, format, *((type *)kp->arg)); \ |
194 | } |
195 | |
196 | STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, strict_strtoul); |
197 | STANDARD_PARAM_DEF(short, short, "%hi", long, strict_strtol); |
198 | STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, strict_strtoul); |
199 | STANDARD_PARAM_DEF(int, int, "%i", long, strict_strtol); |
200 | STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, strict_strtoul); |
201 | STANDARD_PARAM_DEF(long, long, "%li", long, strict_strtol); |
202 | STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, strict_strtoul); |
203 | |
204 | int param_set_charp(const char *val, struct kernel_param *kp) |
205 | { |
206 | if (!val) { |
207 | printk(KERN_ERR "%s: string parameter expected\n", |
208 | kp->name); |
209 | return -EINVAL; |
210 | } |
211 | |
212 | if (strlen(val) > 1024) { |
213 | printk(KERN_ERR "%s: string parameter too long\n", |
214 | kp->name); |
215 | return -ENOSPC; |
216 | } |
217 | |
218 | /* This is a hack. We can't need to strdup in early boot, and we |
219 | * don't need to; this mangled commandline is preserved. */ |
220 | if (slab_is_available()) { |
221 | *(char **)kp->arg = kstrdup(val, GFP_KERNEL); |
222 | if (!*(char **)kp->arg) |
223 | return -ENOMEM; |
224 | } else |
225 | *(const char **)kp->arg = val; |
226 | |
227 | return 0; |
228 | } |
229 | |
230 | int param_get_charp(char *buffer, struct kernel_param *kp) |
231 | { |
232 | return sprintf(buffer, "%s", *((char **)kp->arg)); |
233 | } |
234 | |
235 | /* Actually could be a bool or an int, for historical reasons. */ |
236 | int param_set_bool(const char *val, struct kernel_param *kp) |
237 | { |
238 | bool v; |
239 | |
240 | /* No equals means "set"... */ |
241 | if (!val) val = "1"; |
242 | |
243 | /* One of =[yYnN01] */ |
244 | switch (val[0]) { |
245 | case 'y': case 'Y': case '1': |
246 | v = true; |
247 | break; |
248 | case 'n': case 'N': case '0': |
249 | v = false; |
250 | break; |
251 | default: |
252 | return -EINVAL; |
253 | } |
254 | |
255 | if (kp->flags & KPARAM_ISBOOL) |
256 | *(bool *)kp->arg = v; |
257 | else |
258 | *(int *)kp->arg = v; |
259 | return 0; |
260 | } |
261 | |
262 | int param_get_bool(char *buffer, struct kernel_param *kp) |
263 | { |
264 | bool val; |
265 | if (kp->flags & KPARAM_ISBOOL) |
266 | val = *(bool *)kp->arg; |
267 | else |
268 | val = *(int *)kp->arg; |
269 | |
270 | /* Y and N chosen as being relatively non-coder friendly */ |
271 | return sprintf(buffer, "%c", val ? 'Y' : 'N'); |
272 | } |
273 | |
274 | /* This one must be bool. */ |
275 | int param_set_invbool(const char *val, struct kernel_param *kp) |
276 | { |
277 | int ret; |
278 | bool boolval; |
279 | struct kernel_param dummy; |
280 | |
281 | dummy.arg = &boolval; |
282 | dummy.flags = KPARAM_ISBOOL; |
283 | ret = param_set_bool(val, &dummy); |
284 | if (ret == 0) |
285 | *(bool *)kp->arg = !boolval; |
286 | return ret; |
287 | } |
288 | |
289 | int param_get_invbool(char *buffer, struct kernel_param *kp) |
290 | { |
291 | return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y'); |
292 | } |
293 | |
294 | /* We break the rule and mangle the string. */ |
295 | static int param_array(const char *name, |
296 | const char *val, |
297 | unsigned int min, unsigned int max, |
298 | void *elem, int elemsize, |
299 | int (*set)(const char *, struct kernel_param *kp), |
300 | u16 flags, |
301 | unsigned int *num) |
302 | { |
303 | int ret; |
304 | struct kernel_param kp; |
305 | char save; |
306 | |
307 | /* Get the name right for errors. */ |
308 | kp.name = name; |
309 | kp.arg = elem; |
310 | kp.flags = flags; |
311 | |
312 | /* No equals sign? */ |
313 | if (!val) { |
314 | printk(KERN_ERR "%s: expects arguments\n", name); |
315 | return -EINVAL; |
316 | } |
317 | |
318 | *num = 0; |
319 | /* We expect a comma-separated list of values. */ |
320 | do { |
321 | int len; |
322 | |
323 | if (*num == max) { |
324 | printk(KERN_ERR "%s: can only take %i arguments\n", |
325 | name, max); |
326 | return -EINVAL; |
327 | } |
328 | len = strcspn(val, ","); |
329 | |
330 | /* nul-terminate and parse */ |
331 | save = val[len]; |
332 | ((char *)val)[len] = '\0'; |
333 | ret = set(val, &kp); |
334 | |
335 | if (ret != 0) |
336 | return ret; |
337 | kp.arg += elemsize; |
338 | val += len+1; |
339 | (*num)++; |
340 | } while (save == ','); |
341 | |
342 | if (*num < min) { |
343 | printk(KERN_ERR "%s: needs at least %i arguments\n", |
344 | name, min); |
345 | return -EINVAL; |
346 | } |
347 | return 0; |
348 | } |
349 | |
350 | int param_array_set(const char *val, struct kernel_param *kp) |
351 | { |
352 | const struct kparam_array *arr = kp->arr; |
353 | unsigned int temp_num; |
354 | |
355 | return param_array(kp->name, val, 1, arr->max, arr->elem, |
356 | arr->elemsize, arr->set, kp->flags, |
357 | arr->num ?: &temp_num); |
358 | } |
359 | |
360 | int param_array_get(char *buffer, struct kernel_param *kp) |
361 | { |
362 | int i, off, ret; |
363 | const struct kparam_array *arr = kp->arr; |
364 | struct kernel_param p; |
365 | |
366 | p = *kp; |
367 | for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) { |
368 | if (i) |
369 | buffer[off++] = ','; |
370 | p.arg = arr->elem + arr->elemsize * i; |
371 | ret = arr->get(buffer + off, &p); |
372 | if (ret < 0) |
373 | return ret; |
374 | off += ret; |
375 | } |
376 | buffer[off] = '\0'; |
377 | return off; |
378 | } |
379 | |
380 | int param_set_copystring(const char *val, struct kernel_param *kp) |
381 | { |
382 | const struct kparam_string *kps = kp->str; |
383 | |
384 | if (!val) { |
385 | printk(KERN_ERR "%s: missing param set value\n", kp->name); |
386 | return -EINVAL; |
387 | } |
388 | if (strlen(val)+1 > kps->maxlen) { |
389 | printk(KERN_ERR "%s: string doesn't fit in %u chars.\n", |
390 | kp->name, kps->maxlen-1); |
391 | return -ENOSPC; |
392 | } |
393 | strcpy(kps->string, val); |
394 | return 0; |
395 | } |
396 | |
397 | int param_get_string(char *buffer, struct kernel_param *kp) |
398 | { |
399 | const struct kparam_string *kps = kp->str; |
400 | return strlcpy(buffer, kps->string, kps->maxlen); |
401 | } |
402 | |
403 | /* sysfs output in /sys/modules/XYZ/parameters/ */ |
404 | #define to_module_attr(n) container_of(n, struct module_attribute, attr) |
405 | #define to_module_kobject(n) container_of(n, struct module_kobject, kobj) |
406 | |
407 | extern struct kernel_param __start___param[], __stop___param[]; |
408 | |
409 | struct param_attribute |
410 | { |
411 | struct module_attribute mattr; |
412 | struct kernel_param *param; |
413 | }; |
414 | |
415 | struct module_param_attrs |
416 | { |
417 | unsigned int num; |
418 | struct attribute_group grp; |
419 | struct param_attribute attrs[0]; |
420 | }; |
421 | |
422 | #ifdef CONFIG_SYSFS |
423 | #define to_param_attr(n) container_of(n, struct param_attribute, mattr) |
424 | |
425 | static ssize_t param_attr_show(struct module_attribute *mattr, |
426 | struct module *mod, char *buf) |
427 | { |
428 | int count; |
429 | struct param_attribute *attribute = to_param_attr(mattr); |
430 | |
431 | if (!attribute->param->get) |
432 | return -EPERM; |
433 | |
434 | count = attribute->param->get(buf, attribute->param); |
435 | if (count > 0) { |
436 | strcat(buf, "\n"); |
437 | ++count; |
438 | } |
439 | return count; |
440 | } |
441 | |
442 | /* sysfs always hands a nul-terminated string in buf. We rely on that. */ |
443 | static ssize_t param_attr_store(struct module_attribute *mattr, |
444 | struct module *owner, |
445 | const char *buf, size_t len) |
446 | { |
447 | int err; |
448 | struct param_attribute *attribute = to_param_attr(mattr); |
449 | |
450 | if (!attribute->param->set) |
451 | return -EPERM; |
452 | |
453 | err = attribute->param->set(buf, attribute->param); |
454 | if (!err) |
455 | return len; |
456 | return err; |
457 | } |
458 | #endif |
459 | |
460 | #ifdef CONFIG_MODULES |
461 | #define __modinit |
462 | #else |
463 | #define __modinit __init |
464 | #endif |
465 | |
466 | #ifdef CONFIG_SYSFS |
467 | /* |
468 | * add_sysfs_param - add a parameter to sysfs |
469 | * @mk: struct module_kobject |
470 | * @kparam: the actual parameter definition to add to sysfs |
471 | * @name: name of parameter |
472 | * |
473 | * Create a kobject if for a (per-module) parameter if mp NULL, and |
474 | * create file in sysfs. Returns an error on out of memory. Always cleans up |
475 | * if there's an error. |
476 | */ |
477 | static __modinit int add_sysfs_param(struct module_kobject *mk, |
478 | struct kernel_param *kp, |
479 | const char *name) |
480 | { |
481 | struct module_param_attrs *new; |
482 | struct attribute **attrs; |
483 | int err, num; |
484 | |
485 | /* We don't bother calling this with invisible parameters. */ |
486 | BUG_ON(!kp->perm); |
487 | |
488 | if (!mk->mp) { |
489 | num = 0; |
490 | attrs = NULL; |
491 | } else { |
492 | num = mk->mp->num; |
493 | attrs = mk->mp->grp.attrs; |
494 | } |
495 | |
496 | /* Enlarge. */ |
497 | new = krealloc(mk->mp, |
498 | sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1), |
499 | GFP_KERNEL); |
500 | if (!new) { |
501 | kfree(mk->mp); |
502 | err = -ENOMEM; |
503 | goto fail; |
504 | } |
505 | attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL); |
506 | if (!attrs) { |
507 | err = -ENOMEM; |
508 | goto fail_free_new; |
509 | } |
510 | |
511 | /* Sysfs wants everything zeroed. */ |
512 | memset(new, 0, sizeof(*new)); |
513 | memset(&new->attrs[num], 0, sizeof(new->attrs[num])); |
514 | memset(&attrs[num], 0, sizeof(attrs[num])); |
515 | new->grp.name = "parameters"; |
516 | new->grp.attrs = attrs; |
517 | |
518 | /* Tack new one on the end. */ |
519 | sysfs_attr_init(&new->attrs[num].mattr.attr); |
520 | new->attrs[num].param = kp; |
521 | new->attrs[num].mattr.show = param_attr_show; |
522 | new->attrs[num].mattr.store = param_attr_store; |
523 | new->attrs[num].mattr.attr.name = (char *)name; |
524 | new->attrs[num].mattr.attr.mode = kp->perm; |
525 | new->num = num+1; |
526 | |
527 | /* Fix up all the pointers, since krealloc can move us */ |
528 | for (num = 0; num < new->num; num++) |
529 | new->grp.attrs[num] = &new->attrs[num].mattr.attr; |
530 | new->grp.attrs[num] = NULL; |
531 | |
532 | mk->mp = new; |
533 | return 0; |
534 | |
535 | fail_free_new: |
536 | kfree(new); |
537 | fail: |
538 | mk->mp = NULL; |
539 | return err; |
540 | } |
541 | |
542 | #ifdef CONFIG_MODULES |
543 | static void free_module_param_attrs(struct module_kobject *mk) |
544 | { |
545 | kfree(mk->mp->grp.attrs); |
546 | kfree(mk->mp); |
547 | mk->mp = NULL; |
548 | } |
549 | |
550 | /* |
551 | * module_param_sysfs_setup - setup sysfs support for one module |
552 | * @mod: module |
553 | * @kparam: module parameters (array) |
554 | * @num_params: number of module parameters |
555 | * |
556 | * Adds sysfs entries for module parameters under |
557 | * /sys/module/[mod->name]/parameters/ |
558 | */ |
559 | int module_param_sysfs_setup(struct module *mod, |
560 | struct kernel_param *kparam, |
561 | unsigned int num_params) |
562 | { |
563 | int i, err; |
564 | bool params = false; |
565 | |
566 | for (i = 0; i < num_params; i++) { |
567 | if (kparam[i].perm == 0) |
568 | continue; |
569 | err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name); |
570 | if (err) |
571 | return err; |
572 | params = true; |
573 | } |
574 | |
575 | if (!params) |
576 | return 0; |
577 | |
578 | /* Create the param group. */ |
579 | err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); |
580 | if (err) |
581 | free_module_param_attrs(&mod->mkobj); |
582 | return err; |
583 | } |
584 | |
585 | /* |
586 | * module_param_sysfs_remove - remove sysfs support for one module |
587 | * @mod: module |
588 | * |
589 | * Remove sysfs entries for module parameters and the corresponding |
590 | * kobject. |
591 | */ |
592 | void module_param_sysfs_remove(struct module *mod) |
593 | { |
594 | if (mod->mkobj.mp) { |
595 | sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); |
596 | /* We are positive that no one is using any param |
597 | * attrs at this point. Deallocate immediately. */ |
598 | free_module_param_attrs(&mod->mkobj); |
599 | } |
600 | } |
601 | #endif |
602 | |
603 | void destroy_params(const struct kernel_param *params, unsigned num) |
604 | { |
605 | /* FIXME: This should free kmalloced charp parameters. It doesn't. */ |
606 | } |
607 | |
608 | static void __init kernel_add_sysfs_param(const char *name, |
609 | struct kernel_param *kparam, |
610 | unsigned int name_skip) |
611 | { |
612 | struct module_kobject *mk; |
613 | struct kobject *kobj; |
614 | int err; |
615 | |
616 | kobj = kset_find_obj(module_kset, name); |
617 | if (kobj) { |
618 | /* We already have one. Remove params so we can add more. */ |
619 | mk = to_module_kobject(kobj); |
620 | /* We need to remove it before adding parameters. */ |
621 | sysfs_remove_group(&mk->kobj, &mk->mp->grp); |
622 | } else { |
623 | mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL); |
624 | BUG_ON(!mk); |
625 | |
626 | mk->mod = THIS_MODULE; |
627 | mk->kobj.kset = module_kset; |
628 | err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL, |
629 | "%s", name); |
630 | if (err) { |
631 | kobject_put(&mk->kobj); |
632 | printk(KERN_ERR "Module '%s' failed add to sysfs, " |
633 | "error number %d\n", name, err); |
634 | printk(KERN_ERR "The system will be unstable now.\n"); |
635 | return; |
636 | } |
637 | /* So that exit path is even. */ |
638 | kobject_get(&mk->kobj); |
639 | } |
640 | |
641 | /* These should not fail at boot. */ |
642 | err = add_sysfs_param(mk, kparam, kparam->name + name_skip); |
643 | BUG_ON(err); |
644 | err = sysfs_create_group(&mk->kobj, &mk->mp->grp); |
645 | BUG_ON(err); |
646 | kobject_uevent(&mk->kobj, KOBJ_ADD); |
647 | kobject_put(&mk->kobj); |
648 | } |
649 | |
650 | /* |
651 | * param_sysfs_builtin - add contents in /sys/parameters for built-in modules |
652 | * |
653 | * Add module_parameters to sysfs for "modules" built into the kernel. |
654 | * |
655 | * The "module" name (KBUILD_MODNAME) is stored before a dot, the |
656 | * "parameter" name is stored behind a dot in kernel_param->name. So, |
657 | * extract the "module" name for all built-in kernel_param-eters, |
658 | * and for all who have the same, call kernel_add_sysfs_param. |
659 | */ |
660 | static void __init param_sysfs_builtin(void) |
661 | { |
662 | struct kernel_param *kp; |
663 | unsigned int name_len; |
664 | char modname[MODULE_NAME_LEN]; |
665 | |
666 | for (kp = __start___param; kp < __stop___param; kp++) { |
667 | char *dot; |
668 | |
669 | if (kp->perm == 0) |
670 | continue; |
671 | |
672 | dot = strchr(kp->name, '.'); |
673 | if (!dot) { |
674 | /* This happens for core_param() */ |
675 | strcpy(modname, "kernel"); |
676 | name_len = 0; |
677 | } else { |
678 | name_len = dot - kp->name + 1; |
679 | strlcpy(modname, kp->name, name_len); |
680 | } |
681 | kernel_add_sysfs_param(modname, kp, name_len); |
682 | } |
683 | } |
684 | |
685 | |
686 | /* module-related sysfs stuff */ |
687 | |
688 | static ssize_t module_attr_show(struct kobject *kobj, |
689 | struct attribute *attr, |
690 | char *buf) |
691 | { |
692 | struct module_attribute *attribute; |
693 | struct module_kobject *mk; |
694 | int ret; |
695 | |
696 | attribute = to_module_attr(attr); |
697 | mk = to_module_kobject(kobj); |
698 | |
699 | if (!attribute->show) |
700 | return -EIO; |
701 | |
702 | ret = attribute->show(attribute, mk->mod, buf); |
703 | |
704 | return ret; |
705 | } |
706 | |
707 | static ssize_t module_attr_store(struct kobject *kobj, |
708 | struct attribute *attr, |
709 | const char *buf, size_t len) |
710 | { |
711 | struct module_attribute *attribute; |
712 | struct module_kobject *mk; |
713 | int ret; |
714 | |
715 | attribute = to_module_attr(attr); |
716 | mk = to_module_kobject(kobj); |
717 | |
718 | if (!attribute->store) |
719 | return -EIO; |
720 | |
721 | ret = attribute->store(attribute, mk->mod, buf, len); |
722 | |
723 | return ret; |
724 | } |
725 | |
726 | static const struct sysfs_ops module_sysfs_ops = { |
727 | .show = module_attr_show, |
728 | .store = module_attr_store, |
729 | }; |
730 | |
731 | static int uevent_filter(struct kset *kset, struct kobject *kobj) |
732 | { |
733 | struct kobj_type *ktype = get_ktype(kobj); |
734 | |
735 | if (ktype == &module_ktype) |
736 | return 1; |
737 | return 0; |
738 | } |
739 | |
740 | static const struct kset_uevent_ops module_uevent_ops = { |
741 | .filter = uevent_filter, |
742 | }; |
743 | |
744 | struct kset *module_kset; |
745 | int module_sysfs_initialized; |
746 | |
747 | struct kobj_type module_ktype = { |
748 | .sysfs_ops = &module_sysfs_ops, |
749 | }; |
750 | |
751 | /* |
752 | * param_sysfs_init - wrapper for built-in params support |
753 | */ |
754 | static int __init param_sysfs_init(void) |
755 | { |
756 | module_kset = kset_create_and_add("module", &module_uevent_ops, NULL); |
757 | if (!module_kset) { |
758 | printk(KERN_WARNING "%s (%d): error creating kset\n", |
759 | __FILE__, __LINE__); |
760 | return -ENOMEM; |
761 | } |
762 | module_sysfs_initialized = 1; |
763 | |
764 | param_sysfs_builtin(); |
765 | |
766 | return 0; |
767 | } |
768 | subsys_initcall(param_sysfs_init); |
769 | |
770 | #endif /* CONFIG_SYSFS */ |
771 | |
772 | EXPORT_SYMBOL(param_set_byte); |
773 | EXPORT_SYMBOL(param_get_byte); |
774 | EXPORT_SYMBOL(param_set_short); |
775 | EXPORT_SYMBOL(param_get_short); |
776 | EXPORT_SYMBOL(param_set_ushort); |
777 | EXPORT_SYMBOL(param_get_ushort); |
778 | EXPORT_SYMBOL(param_set_int); |
779 | EXPORT_SYMBOL(param_get_int); |
780 | EXPORT_SYMBOL(param_set_uint); |
781 | EXPORT_SYMBOL(param_get_uint); |
782 | EXPORT_SYMBOL(param_set_long); |
783 | EXPORT_SYMBOL(param_get_long); |
784 | EXPORT_SYMBOL(param_set_ulong); |
785 | EXPORT_SYMBOL(param_get_ulong); |
786 | EXPORT_SYMBOL(param_set_charp); |
787 | EXPORT_SYMBOL(param_get_charp); |
788 | EXPORT_SYMBOL(param_set_bool); |
789 | EXPORT_SYMBOL(param_get_bool); |
790 | EXPORT_SYMBOL(param_set_invbool); |
791 | EXPORT_SYMBOL(param_get_invbool); |
792 | EXPORT_SYMBOL(param_array_set); |
793 | EXPORT_SYMBOL(param_array_get); |
794 | EXPORT_SYMBOL(param_set_copystring); |
795 | EXPORT_SYMBOL(param_get_string); |
796 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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