Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * gendisk handling | |
3 | */ | |
4 | ||
5 | #include <linux/config.h> | |
6 | #include <linux/module.h> | |
7 | #include <linux/fs.h> | |
8 | #include <linux/genhd.h> | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/blkdev.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/seq_file.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/kmod.h> | |
16 | #include <linux/kobj_map.h> | |
17 | ||
18 | #define MAX_PROBE_HASH 255 /* random */ | |
19 | ||
20 | static struct subsystem block_subsys; | |
21 | ||
22 | static DECLARE_MUTEX(block_subsys_sem); | |
23 | ||
24 | /* | |
25 | * Can be deleted altogether. Later. | |
26 | * | |
27 | */ | |
28 | static struct blk_major_name { | |
29 | struct blk_major_name *next; | |
30 | int major; | |
31 | char name[16]; | |
32 | } *major_names[MAX_PROBE_HASH]; | |
33 | ||
34 | /* index in the above - for now: assume no multimajor ranges */ | |
35 | static inline int major_to_index(int major) | |
36 | { | |
37 | return major % MAX_PROBE_HASH; | |
38 | } | |
39 | ||
40 | #ifdef CONFIG_PROC_FS | |
41 | /* get block device names in somewhat random order */ | |
42 | int get_blkdev_list(char *p) | |
43 | { | |
44 | struct blk_major_name *n; | |
45 | int i, len; | |
46 | ||
47 | len = sprintf(p, "\nBlock devices:\n"); | |
48 | ||
49 | down(&block_subsys_sem); | |
50 | for (i = 0; i < ARRAY_SIZE(major_names); i++) { | |
51 | for (n = major_names[i]; n; n = n->next) | |
52 | len += sprintf(p+len, "%3d %s\n", | |
53 | n->major, n->name); | |
54 | } | |
55 | up(&block_subsys_sem); | |
56 | ||
57 | return len; | |
58 | } | |
59 | #endif | |
60 | ||
61 | int register_blkdev(unsigned int major, const char *name) | |
62 | { | |
63 | struct blk_major_name **n, *p; | |
64 | int index, ret = 0; | |
65 | ||
66 | down(&block_subsys_sem); | |
67 | ||
68 | /* temporary */ | |
69 | if (major == 0) { | |
70 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { | |
71 | if (major_names[index] == NULL) | |
72 | break; | |
73 | } | |
74 | ||
75 | if (index == 0) { | |
76 | printk("register_blkdev: failed to get major for %s\n", | |
77 | name); | |
78 | ret = -EBUSY; | |
79 | goto out; | |
80 | } | |
81 | major = index; | |
82 | ret = major; | |
83 | } | |
84 | ||
85 | p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); | |
86 | if (p == NULL) { | |
87 | ret = -ENOMEM; | |
88 | goto out; | |
89 | } | |
90 | ||
91 | p->major = major; | |
92 | strlcpy(p->name, name, sizeof(p->name)); | |
93 | p->next = NULL; | |
94 | index = major_to_index(major); | |
95 | ||
96 | for (n = &major_names[index]; *n; n = &(*n)->next) { | |
97 | if ((*n)->major == major) | |
98 | break; | |
99 | } | |
100 | if (!*n) | |
101 | *n = p; | |
102 | else | |
103 | ret = -EBUSY; | |
104 | ||
105 | if (ret < 0) { | |
106 | printk("register_blkdev: cannot get major %d for %s\n", | |
107 | major, name); | |
108 | kfree(p); | |
109 | } | |
110 | out: | |
111 | up(&block_subsys_sem); | |
112 | return ret; | |
113 | } | |
114 | ||
115 | EXPORT_SYMBOL(register_blkdev); | |
116 | ||
117 | /* todo: make void - error printk here */ | |
118 | int unregister_blkdev(unsigned int major, const char *name) | |
119 | { | |
120 | struct blk_major_name **n; | |
121 | struct blk_major_name *p = NULL; | |
122 | int index = major_to_index(major); | |
123 | int ret = 0; | |
124 | ||
125 | down(&block_subsys_sem); | |
126 | for (n = &major_names[index]; *n; n = &(*n)->next) | |
127 | if ((*n)->major == major) | |
128 | break; | |
129 | if (!*n || strcmp((*n)->name, name)) | |
130 | ret = -EINVAL; | |
131 | else { | |
132 | p = *n; | |
133 | *n = p->next; | |
134 | } | |
135 | up(&block_subsys_sem); | |
136 | kfree(p); | |
137 | ||
138 | return ret; | |
139 | } | |
140 | ||
141 | EXPORT_SYMBOL(unregister_blkdev); | |
142 | ||
143 | static struct kobj_map *bdev_map; | |
144 | ||
145 | /* | |
146 | * Register device numbers dev..(dev+range-1) | |
147 | * range must be nonzero | |
148 | * The hash chain is sorted on range, so that subranges can override. | |
149 | */ | |
150 | void blk_register_region(dev_t dev, unsigned long range, struct module *module, | |
151 | struct kobject *(*probe)(dev_t, int *, void *), | |
152 | int (*lock)(dev_t, void *), void *data) | |
153 | { | |
154 | kobj_map(bdev_map, dev, range, module, probe, lock, data); | |
155 | } | |
156 | ||
157 | EXPORT_SYMBOL(blk_register_region); | |
158 | ||
159 | void blk_unregister_region(dev_t dev, unsigned long range) | |
160 | { | |
161 | kobj_unmap(bdev_map, dev, range); | |
162 | } | |
163 | ||
164 | EXPORT_SYMBOL(blk_unregister_region); | |
165 | ||
166 | static struct kobject *exact_match(dev_t dev, int *part, void *data) | |
167 | { | |
168 | struct gendisk *p = data; | |
169 | return &p->kobj; | |
170 | } | |
171 | ||
172 | static int exact_lock(dev_t dev, void *data) | |
173 | { | |
174 | struct gendisk *p = data; | |
175 | ||
176 | if (!get_disk(p)) | |
177 | return -1; | |
178 | return 0; | |
179 | } | |
180 | ||
181 | /** | |
182 | * add_disk - add partitioning information to kernel list | |
183 | * @disk: per-device partitioning information | |
184 | * | |
185 | * This function registers the partitioning information in @disk | |
186 | * with the kernel. | |
187 | */ | |
188 | void add_disk(struct gendisk *disk) | |
189 | { | |
190 | disk->flags |= GENHD_FL_UP; | |
191 | blk_register_region(MKDEV(disk->major, disk->first_minor), | |
192 | disk->minors, NULL, exact_match, exact_lock, disk); | |
193 | register_disk(disk); | |
194 | blk_register_queue(disk); | |
195 | } | |
196 | ||
197 | EXPORT_SYMBOL(add_disk); | |
198 | EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ | |
199 | ||
200 | void unlink_gendisk(struct gendisk *disk) | |
201 | { | |
202 | blk_unregister_queue(disk); | |
203 | blk_unregister_region(MKDEV(disk->major, disk->first_minor), | |
204 | disk->minors); | |
205 | } | |
206 | ||
207 | #define to_disk(obj) container_of(obj,struct gendisk,kobj) | |
208 | ||
209 | /** | |
210 | * get_gendisk - get partitioning information for a given device | |
211 | * @dev: device to get partitioning information for | |
212 | * | |
213 | * This function gets the structure containing partitioning | |
214 | * information for the given device @dev. | |
215 | */ | |
216 | struct gendisk *get_gendisk(dev_t dev, int *part) | |
217 | { | |
218 | struct kobject *kobj = kobj_lookup(bdev_map, dev, part); | |
219 | return kobj ? to_disk(kobj) : NULL; | |
220 | } | |
221 | ||
222 | #ifdef CONFIG_PROC_FS | |
223 | /* iterator */ | |
224 | static void *part_start(struct seq_file *part, loff_t *pos) | |
225 | { | |
226 | struct list_head *p; | |
227 | loff_t l = *pos; | |
228 | ||
229 | down(&block_subsys_sem); | |
230 | list_for_each(p, &block_subsys.kset.list) | |
231 | if (!l--) | |
232 | return list_entry(p, struct gendisk, kobj.entry); | |
233 | return NULL; | |
234 | } | |
235 | ||
236 | static void *part_next(struct seq_file *part, void *v, loff_t *pos) | |
237 | { | |
238 | struct list_head *p = ((struct gendisk *)v)->kobj.entry.next; | |
239 | ++*pos; | |
240 | return p==&block_subsys.kset.list ? NULL : | |
241 | list_entry(p, struct gendisk, kobj.entry); | |
242 | } | |
243 | ||
244 | static void part_stop(struct seq_file *part, void *v) | |
245 | { | |
246 | up(&block_subsys_sem); | |
247 | } | |
248 | ||
249 | static int show_partition(struct seq_file *part, void *v) | |
250 | { | |
251 | struct gendisk *sgp = v; | |
252 | int n; | |
253 | char buf[BDEVNAME_SIZE]; | |
254 | ||
255 | if (&sgp->kobj.entry == block_subsys.kset.list.next) | |
256 | seq_puts(part, "major minor #blocks name\n\n"); | |
257 | ||
258 | /* Don't show non-partitionable removeable devices or empty devices */ | |
259 | if (!get_capacity(sgp) || | |
260 | (sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE))) | |
261 | return 0; | |
262 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
263 | return 0; | |
264 | ||
265 | /* show the full disk and all non-0 size partitions of it */ | |
266 | seq_printf(part, "%4d %4d %10llu %s\n", | |
267 | sgp->major, sgp->first_minor, | |
268 | (unsigned long long)get_capacity(sgp) >> 1, | |
269 | disk_name(sgp, 0, buf)); | |
270 | for (n = 0; n < sgp->minors - 1; n++) { | |
271 | if (!sgp->part[n]) | |
272 | continue; | |
273 | if (sgp->part[n]->nr_sects == 0) | |
274 | continue; | |
275 | seq_printf(part, "%4d %4d %10llu %s\n", | |
276 | sgp->major, n + 1 + sgp->first_minor, | |
277 | (unsigned long long)sgp->part[n]->nr_sects >> 1 , | |
278 | disk_name(sgp, n + 1, buf)); | |
279 | } | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
284 | struct seq_operations partitions_op = { | |
285 | .start =part_start, | |
286 | .next = part_next, | |
287 | .stop = part_stop, | |
288 | .show = show_partition | |
289 | }; | |
290 | #endif | |
291 | ||
292 | ||
293 | extern int blk_dev_init(void); | |
294 | ||
295 | static struct kobject *base_probe(dev_t dev, int *part, void *data) | |
296 | { | |
297 | if (request_module("block-major-%d-%d", MAJOR(dev), MINOR(dev)) > 0) | |
298 | /* Make old-style 2.4 aliases work */ | |
299 | request_module("block-major-%d", MAJOR(dev)); | |
300 | return NULL; | |
301 | } | |
302 | ||
303 | static int __init genhd_device_init(void) | |
304 | { | |
305 | bdev_map = kobj_map_init(base_probe, &block_subsys_sem); | |
306 | blk_dev_init(); | |
307 | subsystem_register(&block_subsys); | |
308 | return 0; | |
309 | } | |
310 | ||
311 | subsys_initcall(genhd_device_init); | |
312 | ||
313 | ||
314 | ||
315 | /* | |
316 | * kobject & sysfs bindings for block devices | |
317 | */ | |
318 | static ssize_t disk_attr_show(struct kobject *kobj, struct attribute *attr, | |
319 | char *page) | |
320 | { | |
321 | struct gendisk *disk = to_disk(kobj); | |
322 | struct disk_attribute *disk_attr = | |
323 | container_of(attr,struct disk_attribute,attr); | |
324 | ssize_t ret = 0; | |
325 | ||
326 | if (disk_attr->show) | |
327 | ret = disk_attr->show(disk,page); | |
328 | return ret; | |
329 | } | |
330 | ||
331 | static struct sysfs_ops disk_sysfs_ops = { | |
332 | .show = &disk_attr_show, | |
333 | }; | |
334 | ||
335 | static ssize_t disk_dev_read(struct gendisk * disk, char *page) | |
336 | { | |
337 | dev_t base = MKDEV(disk->major, disk->first_minor); | |
338 | return print_dev_t(page, base); | |
339 | } | |
340 | static ssize_t disk_range_read(struct gendisk * disk, char *page) | |
341 | { | |
342 | return sprintf(page, "%d\n", disk->minors); | |
343 | } | |
344 | static ssize_t disk_removable_read(struct gendisk * disk, char *page) | |
345 | { | |
346 | return sprintf(page, "%d\n", | |
347 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
348 | ||
349 | } | |
350 | static ssize_t disk_size_read(struct gendisk * disk, char *page) | |
351 | { | |
352 | return sprintf(page, "%llu\n", (unsigned long long)get_capacity(disk)); | |
353 | } | |
354 | ||
355 | static ssize_t disk_stats_read(struct gendisk * disk, char *page) | |
356 | { | |
357 | preempt_disable(); | |
358 | disk_round_stats(disk); | |
359 | preempt_enable(); | |
360 | return sprintf(page, | |
361 | "%8u %8u %8llu %8u " | |
362 | "%8u %8u %8llu %8u " | |
363 | "%8u %8u %8u" | |
364 | "\n", | |
365 | disk_stat_read(disk, reads), disk_stat_read(disk, read_merges), | |
366 | (unsigned long long)disk_stat_read(disk, read_sectors), | |
367 | jiffies_to_msecs(disk_stat_read(disk, read_ticks)), | |
368 | disk_stat_read(disk, writes), | |
369 | disk_stat_read(disk, write_merges), | |
370 | (unsigned long long)disk_stat_read(disk, write_sectors), | |
371 | jiffies_to_msecs(disk_stat_read(disk, write_ticks)), | |
372 | disk->in_flight, | |
373 | jiffies_to_msecs(disk_stat_read(disk, io_ticks)), | |
374 | jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); | |
375 | } | |
376 | static struct disk_attribute disk_attr_dev = { | |
377 | .attr = {.name = "dev", .mode = S_IRUGO }, | |
378 | .show = disk_dev_read | |
379 | }; | |
380 | static struct disk_attribute disk_attr_range = { | |
381 | .attr = {.name = "range", .mode = S_IRUGO }, | |
382 | .show = disk_range_read | |
383 | }; | |
384 | static struct disk_attribute disk_attr_removable = { | |
385 | .attr = {.name = "removable", .mode = S_IRUGO }, | |
386 | .show = disk_removable_read | |
387 | }; | |
388 | static struct disk_attribute disk_attr_size = { | |
389 | .attr = {.name = "size", .mode = S_IRUGO }, | |
390 | .show = disk_size_read | |
391 | }; | |
392 | static struct disk_attribute disk_attr_stat = { | |
393 | .attr = {.name = "stat", .mode = S_IRUGO }, | |
394 | .show = disk_stats_read | |
395 | }; | |
396 | ||
397 | static struct attribute * default_attrs[] = { | |
398 | &disk_attr_dev.attr, | |
399 | &disk_attr_range.attr, | |
400 | &disk_attr_removable.attr, | |
401 | &disk_attr_size.attr, | |
402 | &disk_attr_stat.attr, | |
403 | NULL, | |
404 | }; | |
405 | ||
406 | static void disk_release(struct kobject * kobj) | |
407 | { | |
408 | struct gendisk *disk = to_disk(kobj); | |
409 | kfree(disk->random); | |
410 | kfree(disk->part); | |
411 | free_disk_stats(disk); | |
412 | kfree(disk); | |
413 | } | |
414 | ||
415 | static struct kobj_type ktype_block = { | |
416 | .release = disk_release, | |
417 | .sysfs_ops = &disk_sysfs_ops, | |
418 | .default_attrs = default_attrs, | |
419 | }; | |
420 | ||
421 | extern struct kobj_type ktype_part; | |
422 | ||
423 | static int block_hotplug_filter(struct kset *kset, struct kobject *kobj) | |
424 | { | |
425 | struct kobj_type *ktype = get_ktype(kobj); | |
426 | ||
427 | return ((ktype == &ktype_block) || (ktype == &ktype_part)); | |
428 | } | |
429 | ||
430 | static int block_hotplug(struct kset *kset, struct kobject *kobj, char **envp, | |
431 | int num_envp, char *buffer, int buffer_size) | |
432 | { | |
433 | struct kobj_type *ktype = get_ktype(kobj); | |
434 | struct device *physdev; | |
435 | struct gendisk *disk; | |
436 | struct hd_struct *part; | |
437 | int length = 0; | |
438 | int i = 0; | |
439 | ||
440 | if (ktype == &ktype_block) { | |
441 | disk = container_of(kobj, struct gendisk, kobj); | |
442 | add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, | |
443 | &length, "MINOR=%u", disk->first_minor); | |
444 | } else if (ktype == &ktype_part) { | |
445 | disk = container_of(kobj->parent, struct gendisk, kobj); | |
446 | part = container_of(kobj, struct hd_struct, kobj); | |
447 | add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, | |
448 | &length, "MINOR=%u", | |
449 | disk->first_minor + part->partno); | |
450 | } else | |
451 | return 0; | |
452 | ||
453 | add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, &length, | |
454 | "MAJOR=%u", disk->major); | |
455 | ||
456 | /* add physical device, backing this device */ | |
457 | physdev = disk->driverfs_dev; | |
458 | if (physdev) { | |
459 | char *path = kobject_get_path(&physdev->kobj, GFP_KERNEL); | |
460 | ||
461 | add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, | |
462 | &length, "PHYSDEVPATH=%s", path); | |
463 | kfree(path); | |
464 | ||
465 | if (physdev->bus) | |
466 | add_hotplug_env_var(envp, num_envp, &i, | |
467 | buffer, buffer_size, &length, | |
468 | "PHYSDEVBUS=%s", | |
469 | physdev->bus->name); | |
470 | ||
471 | if (physdev->driver) | |
472 | add_hotplug_env_var(envp, num_envp, &i, | |
473 | buffer, buffer_size, &length, | |
474 | "PHYSDEVDRIVER=%s", | |
475 | physdev->driver->name); | |
476 | } | |
477 | ||
478 | /* terminate, set to next free slot, shrink available space */ | |
479 | envp[i] = NULL; | |
480 | envp = &envp[i]; | |
481 | num_envp -= i; | |
482 | buffer = &buffer[length]; | |
483 | buffer_size -= length; | |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
488 | static struct kset_hotplug_ops block_hotplug_ops = { | |
489 | .filter = block_hotplug_filter, | |
490 | .hotplug = block_hotplug, | |
491 | }; | |
492 | ||
493 | /* declare block_subsys. */ | |
494 | static decl_subsys(block, &ktype_block, &block_hotplug_ops); | |
495 | ||
496 | ||
497 | /* | |
498 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
499 | * entries do, above, but makes them available through one seq_file. | |
500 | * Watching a few disks may be efficient through sysfs, but watching | |
501 | * all of them will be more efficient through this interface. | |
502 | * | |
503 | * The output looks suspiciously like /proc/partitions with a bunch of | |
504 | * extra fields. | |
505 | */ | |
506 | ||
507 | /* iterator */ | |
508 | static void *diskstats_start(struct seq_file *part, loff_t *pos) | |
509 | { | |
510 | loff_t k = *pos; | |
511 | struct list_head *p; | |
512 | ||
513 | down(&block_subsys_sem); | |
514 | list_for_each(p, &block_subsys.kset.list) | |
515 | if (!k--) | |
516 | return list_entry(p, struct gendisk, kobj.entry); | |
517 | return NULL; | |
518 | } | |
519 | ||
520 | static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos) | |
521 | { | |
522 | struct list_head *p = ((struct gendisk *)v)->kobj.entry.next; | |
523 | ++*pos; | |
524 | return p==&block_subsys.kset.list ? NULL : | |
525 | list_entry(p, struct gendisk, kobj.entry); | |
526 | } | |
527 | ||
528 | static void diskstats_stop(struct seq_file *part, void *v) | |
529 | { | |
530 | up(&block_subsys_sem); | |
531 | } | |
532 | ||
533 | static int diskstats_show(struct seq_file *s, void *v) | |
534 | { | |
535 | struct gendisk *gp = v; | |
536 | char buf[BDEVNAME_SIZE]; | |
537 | int n = 0; | |
538 | ||
539 | /* | |
540 | if (&sgp->kobj.entry == block_subsys.kset.list.next) | |
541 | seq_puts(s, "major minor name" | |
542 | " rio rmerge rsect ruse wio wmerge " | |
543 | "wsect wuse running use aveq" | |
544 | "\n\n"); | |
545 | */ | |
546 | ||
547 | preempt_disable(); | |
548 | disk_round_stats(gp); | |
549 | preempt_enable(); | |
550 | seq_printf(s, "%4d %4d %s %u %u %llu %u %u %u %llu %u %u %u %u\n", | |
551 | gp->major, n + gp->first_minor, disk_name(gp, n, buf), | |
552 | disk_stat_read(gp, reads), disk_stat_read(gp, read_merges), | |
553 | (unsigned long long)disk_stat_read(gp, read_sectors), | |
554 | jiffies_to_msecs(disk_stat_read(gp, read_ticks)), | |
555 | disk_stat_read(gp, writes), disk_stat_read(gp, write_merges), | |
556 | (unsigned long long)disk_stat_read(gp, write_sectors), | |
557 | jiffies_to_msecs(disk_stat_read(gp, write_ticks)), | |
558 | gp->in_flight, | |
559 | jiffies_to_msecs(disk_stat_read(gp, io_ticks)), | |
560 | jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); | |
561 | ||
562 | /* now show all non-0 size partitions of it */ | |
563 | for (n = 0; n < gp->minors - 1; n++) { | |
564 | struct hd_struct *hd = gp->part[n]; | |
565 | ||
566 | if (hd && hd->nr_sects) | |
567 | seq_printf(s, "%4d %4d %s %u %u %u %u\n", | |
568 | gp->major, n + gp->first_minor + 1, | |
569 | disk_name(gp, n + 1, buf), | |
570 | hd->reads, hd->read_sectors, | |
571 | hd->writes, hd->write_sectors); | |
572 | } | |
573 | ||
574 | return 0; | |
575 | } | |
576 | ||
577 | struct seq_operations diskstats_op = { | |
578 | .start = diskstats_start, | |
579 | .next = diskstats_next, | |
580 | .stop = diskstats_stop, | |
581 | .show = diskstats_show | |
582 | }; | |
583 | ||
584 | ||
585 | struct gendisk *alloc_disk(int minors) | |
586 | { | |
587 | struct gendisk *disk = kmalloc(sizeof(struct gendisk), GFP_KERNEL); | |
588 | if (disk) { | |
589 | memset(disk, 0, sizeof(struct gendisk)); | |
590 | if (!init_disk_stats(disk)) { | |
591 | kfree(disk); | |
592 | return NULL; | |
593 | } | |
594 | if (minors > 1) { | |
595 | int size = (minors - 1) * sizeof(struct hd_struct *); | |
596 | disk->part = kmalloc(size, GFP_KERNEL); | |
597 | if (!disk->part) { | |
598 | kfree(disk); | |
599 | return NULL; | |
600 | } | |
601 | memset(disk->part, 0, size); | |
602 | } | |
603 | disk->minors = minors; | |
604 | kobj_set_kset_s(disk,block_subsys); | |
605 | kobject_init(&disk->kobj); | |
606 | rand_initialize_disk(disk); | |
607 | } | |
608 | return disk; | |
609 | } | |
610 | ||
611 | EXPORT_SYMBOL(alloc_disk); | |
612 | ||
613 | struct kobject *get_disk(struct gendisk *disk) | |
614 | { | |
615 | struct module *owner; | |
616 | struct kobject *kobj; | |
617 | ||
618 | if (!disk->fops) | |
619 | return NULL; | |
620 | owner = disk->fops->owner; | |
621 | if (owner && !try_module_get(owner)) | |
622 | return NULL; | |
623 | kobj = kobject_get(&disk->kobj); | |
624 | if (kobj == NULL) { | |
625 | module_put(owner); | |
626 | return NULL; | |
627 | } | |
628 | return kobj; | |
629 | ||
630 | } | |
631 | ||
632 | EXPORT_SYMBOL(get_disk); | |
633 | ||
634 | void put_disk(struct gendisk *disk) | |
635 | { | |
636 | if (disk) | |
637 | kobject_put(&disk->kobj); | |
638 | } | |
639 | ||
640 | EXPORT_SYMBOL(put_disk); | |
641 | ||
642 | void set_device_ro(struct block_device *bdev, int flag) | |
643 | { | |
644 | if (bdev->bd_contains != bdev) | |
645 | bdev->bd_part->policy = flag; | |
646 | else | |
647 | bdev->bd_disk->policy = flag; | |
648 | } | |
649 | ||
650 | EXPORT_SYMBOL(set_device_ro); | |
651 | ||
652 | void set_disk_ro(struct gendisk *disk, int flag) | |
653 | { | |
654 | int i; | |
655 | disk->policy = flag; | |
656 | for (i = 0; i < disk->minors - 1; i++) | |
657 | if (disk->part[i]) disk->part[i]->policy = flag; | |
658 | } | |
659 | ||
660 | EXPORT_SYMBOL(set_disk_ro); | |
661 | ||
662 | int bdev_read_only(struct block_device *bdev) | |
663 | { | |
664 | if (!bdev) | |
665 | return 0; | |
666 | else if (bdev->bd_contains != bdev) | |
667 | return bdev->bd_part->policy; | |
668 | else | |
669 | return bdev->bd_disk->policy; | |
670 | } | |
671 | ||
672 | EXPORT_SYMBOL(bdev_read_only); | |
673 | ||
674 | int invalidate_partition(struct gendisk *disk, int index) | |
675 | { | |
676 | int res = 0; | |
677 | struct block_device *bdev = bdget_disk(disk, index); | |
678 | if (bdev) { | |
679 | res = __invalidate_device(bdev, 1); | |
680 | bdput(bdev); | |
681 | } | |
682 | return res; | |
683 | } | |
684 | ||
685 | EXPORT_SYMBOL(invalidate_partition); |