]>
Commit | Line | Data |
---|---|---|
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> | |
2ef41634 | 17 | #include <linux/buffer_head.h> |
1da177e4 LT |
18 | |
19 | #define MAX_PROBE_HASH 255 /* random */ | |
20 | ||
21 | static struct subsystem block_subsys; | |
22 | ||
23 | static DECLARE_MUTEX(block_subsys_sem); | |
24 | ||
25 | /* | |
26 | * Can be deleted altogether. Later. | |
27 | * | |
28 | */ | |
29 | static struct blk_major_name { | |
30 | struct blk_major_name *next; | |
31 | int major; | |
32 | char name[16]; | |
33 | } *major_names[MAX_PROBE_HASH]; | |
34 | ||
35 | /* index in the above - for now: assume no multimajor ranges */ | |
36 | static inline int major_to_index(int major) | |
37 | { | |
38 | return major % MAX_PROBE_HASH; | |
39 | } | |
40 | ||
41 | #ifdef CONFIG_PROC_FS | |
42 | /* get block device names in somewhat random order */ | |
43 | int get_blkdev_list(char *p) | |
44 | { | |
45 | struct blk_major_name *n; | |
46 | int i, len; | |
47 | ||
48 | len = sprintf(p, "\nBlock devices:\n"); | |
49 | ||
50 | down(&block_subsys_sem); | |
51 | for (i = 0; i < ARRAY_SIZE(major_names); i++) { | |
52 | for (n = major_names[i]; n; n = n->next) | |
53 | len += sprintf(p+len, "%3d %s\n", | |
54 | n->major, n->name); | |
55 | } | |
56 | up(&block_subsys_sem); | |
57 | ||
58 | return len; | |
59 | } | |
60 | #endif | |
61 | ||
62 | int register_blkdev(unsigned int major, const char *name) | |
63 | { | |
64 | struct blk_major_name **n, *p; | |
65 | int index, ret = 0; | |
66 | ||
67 | down(&block_subsys_sem); | |
68 | ||
69 | /* temporary */ | |
70 | if (major == 0) { | |
71 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { | |
72 | if (major_names[index] == NULL) | |
73 | break; | |
74 | } | |
75 | ||
76 | if (index == 0) { | |
77 | printk("register_blkdev: failed to get major for %s\n", | |
78 | name); | |
79 | ret = -EBUSY; | |
80 | goto out; | |
81 | } | |
82 | major = index; | |
83 | ret = major; | |
84 | } | |
85 | ||
86 | p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); | |
87 | if (p == NULL) { | |
88 | ret = -ENOMEM; | |
89 | goto out; | |
90 | } | |
91 | ||
92 | p->major = major; | |
93 | strlcpy(p->name, name, sizeof(p->name)); | |
94 | p->next = NULL; | |
95 | index = major_to_index(major); | |
96 | ||
97 | for (n = &major_names[index]; *n; n = &(*n)->next) { | |
98 | if ((*n)->major == major) | |
99 | break; | |
100 | } | |
101 | if (!*n) | |
102 | *n = p; | |
103 | else | |
104 | ret = -EBUSY; | |
105 | ||
106 | if (ret < 0) { | |
107 | printk("register_blkdev: cannot get major %d for %s\n", | |
108 | major, name); | |
109 | kfree(p); | |
110 | } | |
111 | out: | |
112 | up(&block_subsys_sem); | |
113 | return ret; | |
114 | } | |
115 | ||
116 | EXPORT_SYMBOL(register_blkdev); | |
117 | ||
118 | /* todo: make void - error printk here */ | |
119 | int unregister_blkdev(unsigned int major, const char *name) | |
120 | { | |
121 | struct blk_major_name **n; | |
122 | struct blk_major_name *p = NULL; | |
123 | int index = major_to_index(major); | |
124 | int ret = 0; | |
125 | ||
126 | down(&block_subsys_sem); | |
127 | for (n = &major_names[index]; *n; n = &(*n)->next) | |
128 | if ((*n)->major == major) | |
129 | break; | |
130 | if (!*n || strcmp((*n)->name, name)) | |
131 | ret = -EINVAL; | |
132 | else { | |
133 | p = *n; | |
134 | *n = p->next; | |
135 | } | |
136 | up(&block_subsys_sem); | |
137 | kfree(p); | |
138 | ||
139 | return ret; | |
140 | } | |
141 | ||
142 | EXPORT_SYMBOL(unregister_blkdev); | |
143 | ||
144 | static struct kobj_map *bdev_map; | |
145 | ||
146 | /* | |
147 | * Register device numbers dev..(dev+range-1) | |
148 | * range must be nonzero | |
149 | * The hash chain is sorted on range, so that subranges can override. | |
150 | */ | |
151 | void blk_register_region(dev_t dev, unsigned long range, struct module *module, | |
152 | struct kobject *(*probe)(dev_t, int *, void *), | |
153 | int (*lock)(dev_t, void *), void *data) | |
154 | { | |
155 | kobj_map(bdev_map, dev, range, module, probe, lock, data); | |
156 | } | |
157 | ||
158 | EXPORT_SYMBOL(blk_register_region); | |
159 | ||
160 | void blk_unregister_region(dev_t dev, unsigned long range) | |
161 | { | |
162 | kobj_unmap(bdev_map, dev, range); | |
163 | } | |
164 | ||
165 | EXPORT_SYMBOL(blk_unregister_region); | |
166 | ||
167 | static struct kobject *exact_match(dev_t dev, int *part, void *data) | |
168 | { | |
169 | struct gendisk *p = data; | |
170 | return &p->kobj; | |
171 | } | |
172 | ||
173 | static int exact_lock(dev_t dev, void *data) | |
174 | { | |
175 | struct gendisk *p = data; | |
176 | ||
177 | if (!get_disk(p)) | |
178 | return -1; | |
179 | return 0; | |
180 | } | |
181 | ||
182 | /** | |
183 | * add_disk - add partitioning information to kernel list | |
184 | * @disk: per-device partitioning information | |
185 | * | |
186 | * This function registers the partitioning information in @disk | |
187 | * with the kernel. | |
188 | */ | |
189 | void add_disk(struct gendisk *disk) | |
190 | { | |
191 | disk->flags |= GENHD_FL_UP; | |
192 | blk_register_region(MKDEV(disk->major, disk->first_minor), | |
193 | disk->minors, NULL, exact_match, exact_lock, disk); | |
194 | register_disk(disk); | |
195 | blk_register_queue(disk); | |
196 | } | |
197 | ||
198 | EXPORT_SYMBOL(add_disk); | |
199 | EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ | |
200 | ||
201 | void unlink_gendisk(struct gendisk *disk) | |
202 | { | |
203 | blk_unregister_queue(disk); | |
204 | blk_unregister_region(MKDEV(disk->major, disk->first_minor), | |
205 | disk->minors); | |
206 | } | |
207 | ||
208 | #define to_disk(obj) container_of(obj,struct gendisk,kobj) | |
209 | ||
210 | /** | |
211 | * get_gendisk - get partitioning information for a given device | |
212 | * @dev: device to get partitioning information for | |
213 | * | |
214 | * This function gets the structure containing partitioning | |
215 | * information for the given device @dev. | |
216 | */ | |
217 | struct gendisk *get_gendisk(dev_t dev, int *part) | |
218 | { | |
219 | struct kobject *kobj = kobj_lookup(bdev_map, dev, part); | |
220 | return kobj ? to_disk(kobj) : NULL; | |
221 | } | |
222 | ||
223 | #ifdef CONFIG_PROC_FS | |
224 | /* iterator */ | |
225 | static void *part_start(struct seq_file *part, loff_t *pos) | |
226 | { | |
227 | struct list_head *p; | |
228 | loff_t l = *pos; | |
229 | ||
230 | down(&block_subsys_sem); | |
231 | list_for_each(p, &block_subsys.kset.list) | |
232 | if (!l--) | |
233 | return list_entry(p, struct gendisk, kobj.entry); | |
234 | return NULL; | |
235 | } | |
236 | ||
237 | static void *part_next(struct seq_file *part, void *v, loff_t *pos) | |
238 | { | |
239 | struct list_head *p = ((struct gendisk *)v)->kobj.entry.next; | |
240 | ++*pos; | |
241 | return p==&block_subsys.kset.list ? NULL : | |
242 | list_entry(p, struct gendisk, kobj.entry); | |
243 | } | |
244 | ||
245 | static void part_stop(struct seq_file *part, void *v) | |
246 | { | |
247 | up(&block_subsys_sem); | |
248 | } | |
249 | ||
250 | static int show_partition(struct seq_file *part, void *v) | |
251 | { | |
252 | struct gendisk *sgp = v; | |
253 | int n; | |
254 | char buf[BDEVNAME_SIZE]; | |
255 | ||
256 | if (&sgp->kobj.entry == block_subsys.kset.list.next) | |
257 | seq_puts(part, "major minor #blocks name\n\n"); | |
258 | ||
259 | /* Don't show non-partitionable removeable devices or empty devices */ | |
260 | if (!get_capacity(sgp) || | |
261 | (sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE))) | |
262 | return 0; | |
263 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
264 | return 0; | |
265 | ||
266 | /* show the full disk and all non-0 size partitions of it */ | |
267 | seq_printf(part, "%4d %4d %10llu %s\n", | |
268 | sgp->major, sgp->first_minor, | |
269 | (unsigned long long)get_capacity(sgp) >> 1, | |
270 | disk_name(sgp, 0, buf)); | |
271 | for (n = 0; n < sgp->minors - 1; n++) { | |
272 | if (!sgp->part[n]) | |
273 | continue; | |
274 | if (sgp->part[n]->nr_sects == 0) | |
275 | continue; | |
276 | seq_printf(part, "%4d %4d %10llu %s\n", | |
277 | sgp->major, n + 1 + sgp->first_minor, | |
278 | (unsigned long long)sgp->part[n]->nr_sects >> 1 , | |
279 | disk_name(sgp, n + 1, buf)); | |
280 | } | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
285 | struct seq_operations partitions_op = { | |
286 | .start =part_start, | |
287 | .next = part_next, | |
288 | .stop = part_stop, | |
289 | .show = show_partition | |
290 | }; | |
291 | #endif | |
292 | ||
293 | ||
294 | extern int blk_dev_init(void); | |
295 | ||
296 | static struct kobject *base_probe(dev_t dev, int *part, void *data) | |
297 | { | |
298 | if (request_module("block-major-%d-%d", MAJOR(dev), MINOR(dev)) > 0) | |
299 | /* Make old-style 2.4 aliases work */ | |
300 | request_module("block-major-%d", MAJOR(dev)); | |
301 | return NULL; | |
302 | } | |
303 | ||
304 | static int __init genhd_device_init(void) | |
305 | { | |
306 | bdev_map = kobj_map_init(base_probe, &block_subsys_sem); | |
307 | blk_dev_init(); | |
308 | subsystem_register(&block_subsys); | |
309 | return 0; | |
310 | } | |
311 | ||
312 | subsys_initcall(genhd_device_init); | |
313 | ||
314 | ||
315 | ||
316 | /* | |
317 | * kobject & sysfs bindings for block devices | |
318 | */ | |
319 | static ssize_t disk_attr_show(struct kobject *kobj, struct attribute *attr, | |
320 | char *page) | |
321 | { | |
322 | struct gendisk *disk = to_disk(kobj); | |
323 | struct disk_attribute *disk_attr = | |
324 | container_of(attr,struct disk_attribute,attr); | |
325 | ssize_t ret = 0; | |
326 | ||
327 | if (disk_attr->show) | |
328 | ret = disk_attr->show(disk,page); | |
329 | return ret; | |
330 | } | |
331 | ||
332 | static struct sysfs_ops disk_sysfs_ops = { | |
333 | .show = &disk_attr_show, | |
334 | }; | |
335 | ||
336 | static ssize_t disk_dev_read(struct gendisk * disk, char *page) | |
337 | { | |
338 | dev_t base = MKDEV(disk->major, disk->first_minor); | |
339 | return print_dev_t(page, base); | |
340 | } | |
341 | static ssize_t disk_range_read(struct gendisk * disk, char *page) | |
342 | { | |
343 | return sprintf(page, "%d\n", disk->minors); | |
344 | } | |
345 | static ssize_t disk_removable_read(struct gendisk * disk, char *page) | |
346 | { | |
347 | return sprintf(page, "%d\n", | |
348 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
349 | ||
350 | } | |
351 | static ssize_t disk_size_read(struct gendisk * disk, char *page) | |
352 | { | |
353 | return sprintf(page, "%llu\n", (unsigned long long)get_capacity(disk)); | |
354 | } | |
355 | ||
356 | static ssize_t disk_stats_read(struct gendisk * disk, char *page) | |
357 | { | |
358 | preempt_disable(); | |
359 | disk_round_stats(disk); | |
360 | preempt_enable(); | |
361 | return sprintf(page, | |
362 | "%8u %8u %8llu %8u " | |
363 | "%8u %8u %8llu %8u " | |
364 | "%8u %8u %8u" | |
365 | "\n", | |
366 | disk_stat_read(disk, reads), disk_stat_read(disk, read_merges), | |
367 | (unsigned long long)disk_stat_read(disk, read_sectors), | |
368 | jiffies_to_msecs(disk_stat_read(disk, read_ticks)), | |
369 | disk_stat_read(disk, writes), | |
370 | disk_stat_read(disk, write_merges), | |
371 | (unsigned long long)disk_stat_read(disk, write_sectors), | |
372 | jiffies_to_msecs(disk_stat_read(disk, write_ticks)), | |
373 | disk->in_flight, | |
374 | jiffies_to_msecs(disk_stat_read(disk, io_ticks)), | |
375 | jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); | |
376 | } | |
377 | static struct disk_attribute disk_attr_dev = { | |
378 | .attr = {.name = "dev", .mode = S_IRUGO }, | |
379 | .show = disk_dev_read | |
380 | }; | |
381 | static struct disk_attribute disk_attr_range = { | |
382 | .attr = {.name = "range", .mode = S_IRUGO }, | |
383 | .show = disk_range_read | |
384 | }; | |
385 | static struct disk_attribute disk_attr_removable = { | |
386 | .attr = {.name = "removable", .mode = S_IRUGO }, | |
387 | .show = disk_removable_read | |
388 | }; | |
389 | static struct disk_attribute disk_attr_size = { | |
390 | .attr = {.name = "size", .mode = S_IRUGO }, | |
391 | .show = disk_size_read | |
392 | }; | |
393 | static struct disk_attribute disk_attr_stat = { | |
394 | .attr = {.name = "stat", .mode = S_IRUGO }, | |
395 | .show = disk_stats_read | |
396 | }; | |
397 | ||
398 | static struct attribute * default_attrs[] = { | |
399 | &disk_attr_dev.attr, | |
400 | &disk_attr_range.attr, | |
401 | &disk_attr_removable.attr, | |
402 | &disk_attr_size.attr, | |
403 | &disk_attr_stat.attr, | |
404 | NULL, | |
405 | }; | |
406 | ||
407 | static void disk_release(struct kobject * kobj) | |
408 | { | |
409 | struct gendisk *disk = to_disk(kobj); | |
410 | kfree(disk->random); | |
411 | kfree(disk->part); | |
412 | free_disk_stats(disk); | |
413 | kfree(disk); | |
414 | } | |
415 | ||
416 | static struct kobj_type ktype_block = { | |
417 | .release = disk_release, | |
418 | .sysfs_ops = &disk_sysfs_ops, | |
419 | .default_attrs = default_attrs, | |
420 | }; | |
421 | ||
422 | extern struct kobj_type ktype_part; | |
423 | ||
424 | static int block_hotplug_filter(struct kset *kset, struct kobject *kobj) | |
425 | { | |
426 | struct kobj_type *ktype = get_ktype(kobj); | |
427 | ||
428 | return ((ktype == &ktype_block) || (ktype == &ktype_part)); | |
429 | } | |
430 | ||
431 | static int block_hotplug(struct kset *kset, struct kobject *kobj, char **envp, | |
432 | int num_envp, char *buffer, int buffer_size) | |
433 | { | |
434 | struct kobj_type *ktype = get_ktype(kobj); | |
435 | struct device *physdev; | |
436 | struct gendisk *disk; | |
437 | struct hd_struct *part; | |
438 | int length = 0; | |
439 | int i = 0; | |
440 | ||
441 | if (ktype == &ktype_block) { | |
442 | disk = container_of(kobj, struct gendisk, kobj); | |
443 | add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, | |
444 | &length, "MINOR=%u", disk->first_minor); | |
445 | } else if (ktype == &ktype_part) { | |
446 | disk = container_of(kobj->parent, struct gendisk, kobj); | |
447 | part = container_of(kobj, struct hd_struct, kobj); | |
448 | add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, | |
449 | &length, "MINOR=%u", | |
450 | disk->first_minor + part->partno); | |
451 | } else | |
452 | return 0; | |
453 | ||
454 | add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, &length, | |
455 | "MAJOR=%u", disk->major); | |
456 | ||
457 | /* add physical device, backing this device */ | |
458 | physdev = disk->driverfs_dev; | |
459 | if (physdev) { | |
460 | char *path = kobject_get_path(&physdev->kobj, GFP_KERNEL); | |
461 | ||
462 | add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, | |
463 | &length, "PHYSDEVPATH=%s", path); | |
464 | kfree(path); | |
465 | ||
466 | if (physdev->bus) | |
467 | add_hotplug_env_var(envp, num_envp, &i, | |
468 | buffer, buffer_size, &length, | |
469 | "PHYSDEVBUS=%s", | |
470 | physdev->bus->name); | |
471 | ||
472 | if (physdev->driver) | |
473 | add_hotplug_env_var(envp, num_envp, &i, | |
474 | buffer, buffer_size, &length, | |
475 | "PHYSDEVDRIVER=%s", | |
476 | physdev->driver->name); | |
477 | } | |
478 | ||
479 | /* terminate, set to next free slot, shrink available space */ | |
480 | envp[i] = NULL; | |
481 | envp = &envp[i]; | |
482 | num_envp -= i; | |
483 | buffer = &buffer[length]; | |
484 | buffer_size -= length; | |
485 | ||
486 | return 0; | |
487 | } | |
488 | ||
489 | static struct kset_hotplug_ops block_hotplug_ops = { | |
490 | .filter = block_hotplug_filter, | |
491 | .hotplug = block_hotplug, | |
492 | }; | |
493 | ||
494 | /* declare block_subsys. */ | |
495 | static decl_subsys(block, &ktype_block, &block_hotplug_ops); | |
496 | ||
497 | ||
498 | /* | |
499 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
500 | * entries do, above, but makes them available through one seq_file. | |
501 | * Watching a few disks may be efficient through sysfs, but watching | |
502 | * all of them will be more efficient through this interface. | |
503 | * | |
504 | * The output looks suspiciously like /proc/partitions with a bunch of | |
505 | * extra fields. | |
506 | */ | |
507 | ||
508 | /* iterator */ | |
509 | static void *diskstats_start(struct seq_file *part, loff_t *pos) | |
510 | { | |
511 | loff_t k = *pos; | |
512 | struct list_head *p; | |
513 | ||
514 | down(&block_subsys_sem); | |
515 | list_for_each(p, &block_subsys.kset.list) | |
516 | if (!k--) | |
517 | return list_entry(p, struct gendisk, kobj.entry); | |
518 | return NULL; | |
519 | } | |
520 | ||
521 | static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos) | |
522 | { | |
523 | struct list_head *p = ((struct gendisk *)v)->kobj.entry.next; | |
524 | ++*pos; | |
525 | return p==&block_subsys.kset.list ? NULL : | |
526 | list_entry(p, struct gendisk, kobj.entry); | |
527 | } | |
528 | ||
529 | static void diskstats_stop(struct seq_file *part, void *v) | |
530 | { | |
531 | up(&block_subsys_sem); | |
532 | } | |
533 | ||
534 | static int diskstats_show(struct seq_file *s, void *v) | |
535 | { | |
536 | struct gendisk *gp = v; | |
537 | char buf[BDEVNAME_SIZE]; | |
538 | int n = 0; | |
539 | ||
540 | /* | |
541 | if (&sgp->kobj.entry == block_subsys.kset.list.next) | |
542 | seq_puts(s, "major minor name" | |
543 | " rio rmerge rsect ruse wio wmerge " | |
544 | "wsect wuse running use aveq" | |
545 | "\n\n"); | |
546 | */ | |
547 | ||
548 | preempt_disable(); | |
549 | disk_round_stats(gp); | |
550 | preempt_enable(); | |
551 | seq_printf(s, "%4d %4d %s %u %u %llu %u %u %u %llu %u %u %u %u\n", | |
552 | gp->major, n + gp->first_minor, disk_name(gp, n, buf), | |
553 | disk_stat_read(gp, reads), disk_stat_read(gp, read_merges), | |
554 | (unsigned long long)disk_stat_read(gp, read_sectors), | |
555 | jiffies_to_msecs(disk_stat_read(gp, read_ticks)), | |
556 | disk_stat_read(gp, writes), disk_stat_read(gp, write_merges), | |
557 | (unsigned long long)disk_stat_read(gp, write_sectors), | |
558 | jiffies_to_msecs(disk_stat_read(gp, write_ticks)), | |
559 | gp->in_flight, | |
560 | jiffies_to_msecs(disk_stat_read(gp, io_ticks)), | |
561 | jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); | |
562 | ||
563 | /* now show all non-0 size partitions of it */ | |
564 | for (n = 0; n < gp->minors - 1; n++) { | |
565 | struct hd_struct *hd = gp->part[n]; | |
566 | ||
567 | if (hd && hd->nr_sects) | |
568 | seq_printf(s, "%4d %4d %s %u %u %u %u\n", | |
569 | gp->major, n + gp->first_minor + 1, | |
570 | disk_name(gp, n + 1, buf), | |
571 | hd->reads, hd->read_sectors, | |
572 | hd->writes, hd->write_sectors); | |
573 | } | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | struct seq_operations diskstats_op = { | |
579 | .start = diskstats_start, | |
580 | .next = diskstats_next, | |
581 | .stop = diskstats_stop, | |
582 | .show = diskstats_show | |
583 | }; | |
584 | ||
585 | ||
586 | struct gendisk *alloc_disk(int minors) | |
587 | { | |
588 | struct gendisk *disk = kmalloc(sizeof(struct gendisk), GFP_KERNEL); | |
589 | if (disk) { | |
590 | memset(disk, 0, sizeof(struct gendisk)); | |
591 | if (!init_disk_stats(disk)) { | |
592 | kfree(disk); | |
593 | return NULL; | |
594 | } | |
595 | if (minors > 1) { | |
596 | int size = (minors - 1) * sizeof(struct hd_struct *); | |
597 | disk->part = kmalloc(size, GFP_KERNEL); | |
598 | if (!disk->part) { | |
599 | kfree(disk); | |
600 | return NULL; | |
601 | } | |
602 | memset(disk->part, 0, size); | |
603 | } | |
604 | disk->minors = minors; | |
605 | kobj_set_kset_s(disk,block_subsys); | |
606 | kobject_init(&disk->kobj); | |
607 | rand_initialize_disk(disk); | |
608 | } | |
609 | return disk; | |
610 | } | |
611 | ||
612 | EXPORT_SYMBOL(alloc_disk); | |
613 | ||
614 | struct kobject *get_disk(struct gendisk *disk) | |
615 | { | |
616 | struct module *owner; | |
617 | struct kobject *kobj; | |
618 | ||
619 | if (!disk->fops) | |
620 | return NULL; | |
621 | owner = disk->fops->owner; | |
622 | if (owner && !try_module_get(owner)) | |
623 | return NULL; | |
624 | kobj = kobject_get(&disk->kobj); | |
625 | if (kobj == NULL) { | |
626 | module_put(owner); | |
627 | return NULL; | |
628 | } | |
629 | return kobj; | |
630 | ||
631 | } | |
632 | ||
633 | EXPORT_SYMBOL(get_disk); | |
634 | ||
635 | void put_disk(struct gendisk *disk) | |
636 | { | |
637 | if (disk) | |
638 | kobject_put(&disk->kobj); | |
639 | } | |
640 | ||
641 | EXPORT_SYMBOL(put_disk); | |
642 | ||
643 | void set_device_ro(struct block_device *bdev, int flag) | |
644 | { | |
645 | if (bdev->bd_contains != bdev) | |
646 | bdev->bd_part->policy = flag; | |
647 | else | |
648 | bdev->bd_disk->policy = flag; | |
649 | } | |
650 | ||
651 | EXPORT_SYMBOL(set_device_ro); | |
652 | ||
653 | void set_disk_ro(struct gendisk *disk, int flag) | |
654 | { | |
655 | int i; | |
656 | disk->policy = flag; | |
657 | for (i = 0; i < disk->minors - 1; i++) | |
658 | if (disk->part[i]) disk->part[i]->policy = flag; | |
659 | } | |
660 | ||
661 | EXPORT_SYMBOL(set_disk_ro); | |
662 | ||
663 | int bdev_read_only(struct block_device *bdev) | |
664 | { | |
665 | if (!bdev) | |
666 | return 0; | |
667 | else if (bdev->bd_contains != bdev) | |
668 | return bdev->bd_part->policy; | |
669 | else | |
670 | return bdev->bd_disk->policy; | |
671 | } | |
672 | ||
673 | EXPORT_SYMBOL(bdev_read_only); | |
674 | ||
675 | int invalidate_partition(struct gendisk *disk, int index) | |
676 | { | |
677 | int res = 0; | |
678 | struct block_device *bdev = bdget_disk(disk, index); | |
679 | if (bdev) { | |
2ef41634 CH |
680 | fsync_bdev(bdev); |
681 | res = __invalidate_device(bdev); | |
1da177e4 LT |
682 | bdput(bdev); |
683 | } | |
684 | return res; | |
685 | } | |
686 | ||
687 | EXPORT_SYMBOL(invalidate_partition); |