Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * gendisk handling | |
3 | */ | |
4 | ||
1da177e4 LT |
5 | #include <linux/module.h> |
6 | #include <linux/fs.h> | |
7 | #include <linux/genhd.h> | |
b446b60e | 8 | #include <linux/kdev_t.h> |
1da177e4 LT |
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> |
58383af6 | 18 | #include <linux/mutex.h> |
1da177e4 | 19 | |
b9d9c82b | 20 | struct subsystem block_subsys; |
58383af6 | 21 | static DEFINE_MUTEX(block_subsys_lock); |
1da177e4 LT |
22 | |
23 | /* | |
24 | * Can be deleted altogether. Later. | |
25 | * | |
26 | */ | |
27 | static struct blk_major_name { | |
28 | struct blk_major_name *next; | |
29 | int major; | |
30 | char name[16]; | |
68eef3b4 | 31 | } *major_names[BLKDEV_MAJOR_HASH_SIZE]; |
1da177e4 LT |
32 | |
33 | /* index in the above - for now: assume no multimajor ranges */ | |
34 | static inline int major_to_index(int major) | |
35 | { | |
68eef3b4 | 36 | return major % BLKDEV_MAJOR_HASH_SIZE; |
7170be5f NH |
37 | } |
38 | ||
68eef3b4 | 39 | #ifdef CONFIG_PROC_FS |
7170be5f | 40 | |
68eef3b4 | 41 | void blkdev_show(struct seq_file *f, off_t offset) |
7170be5f | 42 | { |
68eef3b4 | 43 | struct blk_major_name *dp; |
7170be5f | 44 | |
68eef3b4 JK |
45 | if (offset < BLKDEV_MAJOR_HASH_SIZE) { |
46 | mutex_lock(&block_subsys_lock); | |
47 | for (dp = major_names[offset]; dp; dp = dp->next) | |
48 | seq_printf(f, "%3d %s\n", dp->major, dp->name); | |
49 | mutex_unlock(&block_subsys_lock); | |
1da177e4 | 50 | } |
1da177e4 | 51 | } |
7170be5f | 52 | |
68eef3b4 | 53 | #endif /* CONFIG_PROC_FS */ |
1da177e4 LT |
54 | |
55 | int register_blkdev(unsigned int major, const char *name) | |
56 | { | |
57 | struct blk_major_name **n, *p; | |
58 | int index, ret = 0; | |
59 | ||
58383af6 | 60 | mutex_lock(&block_subsys_lock); |
1da177e4 LT |
61 | |
62 | /* temporary */ | |
63 | if (major == 0) { | |
64 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { | |
65 | if (major_names[index] == NULL) | |
66 | break; | |
67 | } | |
68 | ||
69 | if (index == 0) { | |
70 | printk("register_blkdev: failed to get major for %s\n", | |
71 | name); | |
72 | ret = -EBUSY; | |
73 | goto out; | |
74 | } | |
75 | major = index; | |
76 | ret = major; | |
77 | } | |
78 | ||
79 | p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); | |
80 | if (p == NULL) { | |
81 | ret = -ENOMEM; | |
82 | goto out; | |
83 | } | |
84 | ||
85 | p->major = major; | |
86 | strlcpy(p->name, name, sizeof(p->name)); | |
87 | p->next = NULL; | |
88 | index = major_to_index(major); | |
89 | ||
90 | for (n = &major_names[index]; *n; n = &(*n)->next) { | |
91 | if ((*n)->major == major) | |
92 | break; | |
93 | } | |
94 | if (!*n) | |
95 | *n = p; | |
96 | else | |
97 | ret = -EBUSY; | |
98 | ||
99 | if (ret < 0) { | |
100 | printk("register_blkdev: cannot get major %d for %s\n", | |
101 | major, name); | |
102 | kfree(p); | |
103 | } | |
104 | out: | |
58383af6 | 105 | mutex_unlock(&block_subsys_lock); |
1da177e4 LT |
106 | return ret; |
107 | } | |
108 | ||
109 | EXPORT_SYMBOL(register_blkdev); | |
110 | ||
111 | /* todo: make void - error printk here */ | |
112 | int unregister_blkdev(unsigned int major, const char *name) | |
113 | { | |
114 | struct blk_major_name **n; | |
115 | struct blk_major_name *p = NULL; | |
116 | int index = major_to_index(major); | |
117 | int ret = 0; | |
118 | ||
58383af6 | 119 | mutex_lock(&block_subsys_lock); |
1da177e4 LT |
120 | for (n = &major_names[index]; *n; n = &(*n)->next) |
121 | if ((*n)->major == major) | |
122 | break; | |
123 | if (!*n || strcmp((*n)->name, name)) | |
124 | ret = -EINVAL; | |
125 | else { | |
126 | p = *n; | |
127 | *n = p->next; | |
128 | } | |
58383af6 | 129 | mutex_unlock(&block_subsys_lock); |
1da177e4 LT |
130 | kfree(p); |
131 | ||
132 | return ret; | |
133 | } | |
134 | ||
135 | EXPORT_SYMBOL(unregister_blkdev); | |
136 | ||
137 | static struct kobj_map *bdev_map; | |
138 | ||
139 | /* | |
140 | * Register device numbers dev..(dev+range-1) | |
141 | * range must be nonzero | |
142 | * The hash chain is sorted on range, so that subranges can override. | |
143 | */ | |
144 | void blk_register_region(dev_t dev, unsigned long range, struct module *module, | |
145 | struct kobject *(*probe)(dev_t, int *, void *), | |
146 | int (*lock)(dev_t, void *), void *data) | |
147 | { | |
148 | kobj_map(bdev_map, dev, range, module, probe, lock, data); | |
149 | } | |
150 | ||
151 | EXPORT_SYMBOL(blk_register_region); | |
152 | ||
153 | void blk_unregister_region(dev_t dev, unsigned long range) | |
154 | { | |
155 | kobj_unmap(bdev_map, dev, range); | |
156 | } | |
157 | ||
158 | EXPORT_SYMBOL(blk_unregister_region); | |
159 | ||
160 | static struct kobject *exact_match(dev_t dev, int *part, void *data) | |
161 | { | |
162 | struct gendisk *p = data; | |
163 | return &p->kobj; | |
164 | } | |
165 | ||
166 | static int exact_lock(dev_t dev, void *data) | |
167 | { | |
168 | struct gendisk *p = data; | |
169 | ||
170 | if (!get_disk(p)) | |
171 | return -1; | |
172 | return 0; | |
173 | } | |
174 | ||
175 | /** | |
176 | * add_disk - add partitioning information to kernel list | |
177 | * @disk: per-device partitioning information | |
178 | * | |
179 | * This function registers the partitioning information in @disk | |
180 | * with the kernel. | |
181 | */ | |
182 | void add_disk(struct gendisk *disk) | |
183 | { | |
184 | disk->flags |= GENHD_FL_UP; | |
185 | blk_register_region(MKDEV(disk->major, disk->first_minor), | |
186 | disk->minors, NULL, exact_match, exact_lock, disk); | |
187 | register_disk(disk); | |
188 | blk_register_queue(disk); | |
189 | } | |
190 | ||
191 | EXPORT_SYMBOL(add_disk); | |
192 | EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ | |
193 | ||
194 | void unlink_gendisk(struct gendisk *disk) | |
195 | { | |
196 | blk_unregister_queue(disk); | |
197 | blk_unregister_region(MKDEV(disk->major, disk->first_minor), | |
198 | disk->minors); | |
199 | } | |
200 | ||
201 | #define to_disk(obj) container_of(obj,struct gendisk,kobj) | |
202 | ||
203 | /** | |
204 | * get_gendisk - get partitioning information for a given device | |
205 | * @dev: device to get partitioning information for | |
206 | * | |
207 | * This function gets the structure containing partitioning | |
208 | * information for the given device @dev. | |
209 | */ | |
210 | struct gendisk *get_gendisk(dev_t dev, int *part) | |
211 | { | |
212 | struct kobject *kobj = kobj_lookup(bdev_map, dev, part); | |
213 | return kobj ? to_disk(kobj) : NULL; | |
214 | } | |
215 | ||
216 | #ifdef CONFIG_PROC_FS | |
217 | /* iterator */ | |
218 | static void *part_start(struct seq_file *part, loff_t *pos) | |
219 | { | |
220 | struct list_head *p; | |
221 | loff_t l = *pos; | |
222 | ||
58383af6 | 223 | mutex_lock(&block_subsys_lock); |
1da177e4 LT |
224 | list_for_each(p, &block_subsys.kset.list) |
225 | if (!l--) | |
226 | return list_entry(p, struct gendisk, kobj.entry); | |
227 | return NULL; | |
228 | } | |
229 | ||
230 | static void *part_next(struct seq_file *part, void *v, loff_t *pos) | |
231 | { | |
232 | struct list_head *p = ((struct gendisk *)v)->kobj.entry.next; | |
233 | ++*pos; | |
234 | return p==&block_subsys.kset.list ? NULL : | |
235 | list_entry(p, struct gendisk, kobj.entry); | |
236 | } | |
237 | ||
238 | static void part_stop(struct seq_file *part, void *v) | |
239 | { | |
58383af6 | 240 | mutex_unlock(&block_subsys_lock); |
1da177e4 LT |
241 | } |
242 | ||
243 | static int show_partition(struct seq_file *part, void *v) | |
244 | { | |
245 | struct gendisk *sgp = v; | |
246 | int n; | |
247 | char buf[BDEVNAME_SIZE]; | |
248 | ||
249 | if (&sgp->kobj.entry == block_subsys.kset.list.next) | |
250 | seq_puts(part, "major minor #blocks name\n\n"); | |
251 | ||
252 | /* Don't show non-partitionable removeable devices or empty devices */ | |
253 | if (!get_capacity(sgp) || | |
254 | (sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE))) | |
255 | return 0; | |
256 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
257 | return 0; | |
258 | ||
259 | /* show the full disk and all non-0 size partitions of it */ | |
260 | seq_printf(part, "%4d %4d %10llu %s\n", | |
261 | sgp->major, sgp->first_minor, | |
262 | (unsigned long long)get_capacity(sgp) >> 1, | |
263 | disk_name(sgp, 0, buf)); | |
264 | for (n = 0; n < sgp->minors - 1; n++) { | |
265 | if (!sgp->part[n]) | |
266 | continue; | |
267 | if (sgp->part[n]->nr_sects == 0) | |
268 | continue; | |
269 | seq_printf(part, "%4d %4d %10llu %s\n", | |
270 | sgp->major, n + 1 + sgp->first_minor, | |
271 | (unsigned long long)sgp->part[n]->nr_sects >> 1 , | |
272 | disk_name(sgp, n + 1, buf)); | |
273 | } | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | struct seq_operations partitions_op = { | |
279 | .start =part_start, | |
280 | .next = part_next, | |
281 | .stop = part_stop, | |
282 | .show = show_partition | |
283 | }; | |
284 | #endif | |
285 | ||
286 | ||
287 | extern int blk_dev_init(void); | |
288 | ||
289 | static struct kobject *base_probe(dev_t dev, int *part, void *data) | |
290 | { | |
291 | if (request_module("block-major-%d-%d", MAJOR(dev), MINOR(dev)) > 0) | |
292 | /* Make old-style 2.4 aliases work */ | |
293 | request_module("block-major-%d", MAJOR(dev)); | |
294 | return NULL; | |
295 | } | |
296 | ||
297 | static int __init genhd_device_init(void) | |
298 | { | |
87a57261 RD |
299 | int err; |
300 | ||
58383af6 | 301 | bdev_map = kobj_map_init(base_probe, &block_subsys_lock); |
1da177e4 | 302 | blk_dev_init(); |
87a57261 RD |
303 | err = subsystem_register(&block_subsys); |
304 | if (err < 0) | |
305 | printk(KERN_WARNING "%s: subsystem_register error: %d\n", | |
306 | __FUNCTION__, err); | |
307 | return err; | |
1da177e4 LT |
308 | } |
309 | ||
310 | subsys_initcall(genhd_device_init); | |
311 | ||
312 | ||
313 | ||
314 | /* | |
315 | * kobject & sysfs bindings for block devices | |
316 | */ | |
317 | static ssize_t disk_attr_show(struct kobject *kobj, struct attribute *attr, | |
318 | char *page) | |
319 | { | |
320 | struct gendisk *disk = to_disk(kobj); | |
321 | struct disk_attribute *disk_attr = | |
322 | container_of(attr,struct disk_attribute,attr); | |
6c1852a0 | 323 | ssize_t ret = -EIO; |
1da177e4 LT |
324 | |
325 | if (disk_attr->show) | |
326 | ret = disk_attr->show(disk,page); | |
327 | return ret; | |
328 | } | |
329 | ||
a7fd6706 KS |
330 | static ssize_t disk_attr_store(struct kobject * kobj, struct attribute * attr, |
331 | const char *page, size_t count) | |
332 | { | |
333 | struct gendisk *disk = to_disk(kobj); | |
334 | struct disk_attribute *disk_attr = | |
335 | container_of(attr,struct disk_attribute,attr); | |
336 | ssize_t ret = 0; | |
337 | ||
338 | if (disk_attr->store) | |
339 | ret = disk_attr->store(disk, page, count); | |
340 | return ret; | |
341 | } | |
342 | ||
1da177e4 LT |
343 | static struct sysfs_ops disk_sysfs_ops = { |
344 | .show = &disk_attr_show, | |
a7fd6706 | 345 | .store = &disk_attr_store, |
1da177e4 LT |
346 | }; |
347 | ||
a7fd6706 KS |
348 | static ssize_t disk_uevent_store(struct gendisk * disk, |
349 | const char *buf, size_t count) | |
350 | { | |
312c004d | 351 | kobject_uevent(&disk->kobj, KOBJ_ADD); |
a7fd6706 KS |
352 | return count; |
353 | } | |
1da177e4 LT |
354 | static ssize_t disk_dev_read(struct gendisk * disk, char *page) |
355 | { | |
356 | dev_t base = MKDEV(disk->major, disk->first_minor); | |
357 | return print_dev_t(page, base); | |
358 | } | |
359 | static ssize_t disk_range_read(struct gendisk * disk, char *page) | |
360 | { | |
361 | return sprintf(page, "%d\n", disk->minors); | |
362 | } | |
363 | static ssize_t disk_removable_read(struct gendisk * disk, char *page) | |
364 | { | |
365 | return sprintf(page, "%d\n", | |
366 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
367 | ||
368 | } | |
369 | static ssize_t disk_size_read(struct gendisk * disk, char *page) | |
370 | { | |
371 | return sprintf(page, "%llu\n", (unsigned long long)get_capacity(disk)); | |
372 | } | |
373 | ||
374 | static ssize_t disk_stats_read(struct gendisk * disk, char *page) | |
375 | { | |
376 | preempt_disable(); | |
377 | disk_round_stats(disk); | |
378 | preempt_enable(); | |
379 | return sprintf(page, | |
837c7878 BW |
380 | "%8lu %8lu %8llu %8u " |
381 | "%8lu %8lu %8llu %8u " | |
1da177e4 LT |
382 | "%8u %8u %8u" |
383 | "\n", | |
47a00410 JA |
384 | disk_stat_read(disk, ios[READ]), |
385 | disk_stat_read(disk, merges[READ]), | |
386 | (unsigned long long)disk_stat_read(disk, sectors[READ]), | |
387 | jiffies_to_msecs(disk_stat_read(disk, ticks[READ])), | |
388 | disk_stat_read(disk, ios[WRITE]), | |
389 | disk_stat_read(disk, merges[WRITE]), | |
390 | (unsigned long long)disk_stat_read(disk, sectors[WRITE]), | |
391 | jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])), | |
1da177e4 LT |
392 | disk->in_flight, |
393 | jiffies_to_msecs(disk_stat_read(disk, io_ticks)), | |
394 | jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); | |
395 | } | |
a7fd6706 KS |
396 | static struct disk_attribute disk_attr_uevent = { |
397 | .attr = {.name = "uevent", .mode = S_IWUSR }, | |
398 | .store = disk_uevent_store | |
399 | }; | |
1da177e4 LT |
400 | static struct disk_attribute disk_attr_dev = { |
401 | .attr = {.name = "dev", .mode = S_IRUGO }, | |
402 | .show = disk_dev_read | |
403 | }; | |
404 | static struct disk_attribute disk_attr_range = { | |
405 | .attr = {.name = "range", .mode = S_IRUGO }, | |
406 | .show = disk_range_read | |
407 | }; | |
408 | static struct disk_attribute disk_attr_removable = { | |
409 | .attr = {.name = "removable", .mode = S_IRUGO }, | |
410 | .show = disk_removable_read | |
411 | }; | |
412 | static struct disk_attribute disk_attr_size = { | |
413 | .attr = {.name = "size", .mode = S_IRUGO }, | |
414 | .show = disk_size_read | |
415 | }; | |
416 | static struct disk_attribute disk_attr_stat = { | |
417 | .attr = {.name = "stat", .mode = S_IRUGO }, | |
418 | .show = disk_stats_read | |
419 | }; | |
420 | ||
c17bb495 AM |
421 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
422 | ||
423 | static ssize_t disk_fail_store(struct gendisk * disk, | |
424 | const char *buf, size_t count) | |
425 | { | |
426 | int i; | |
427 | ||
428 | if (count > 0 && sscanf(buf, "%d", &i) > 0) { | |
429 | if (i == 0) | |
430 | disk->flags &= ~GENHD_FL_FAIL; | |
431 | else | |
432 | disk->flags |= GENHD_FL_FAIL; | |
433 | } | |
434 | ||
435 | return count; | |
436 | } | |
437 | static ssize_t disk_fail_read(struct gendisk * disk, char *page) | |
438 | { | |
439 | return sprintf(page, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0); | |
440 | } | |
441 | static struct disk_attribute disk_attr_fail = { | |
442 | .attr = {.name = "make-it-fail", .mode = S_IRUGO | S_IWUSR }, | |
443 | .store = disk_fail_store, | |
444 | .show = disk_fail_read | |
445 | }; | |
446 | ||
447 | #endif | |
448 | ||
1da177e4 | 449 | static struct attribute * default_attrs[] = { |
a7fd6706 | 450 | &disk_attr_uevent.attr, |
1da177e4 LT |
451 | &disk_attr_dev.attr, |
452 | &disk_attr_range.attr, | |
453 | &disk_attr_removable.attr, | |
454 | &disk_attr_size.attr, | |
455 | &disk_attr_stat.attr, | |
c17bb495 AM |
456 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
457 | &disk_attr_fail.attr, | |
458 | #endif | |
1da177e4 LT |
459 | NULL, |
460 | }; | |
461 | ||
462 | static void disk_release(struct kobject * kobj) | |
463 | { | |
464 | struct gendisk *disk = to_disk(kobj); | |
465 | kfree(disk->random); | |
466 | kfree(disk->part); | |
467 | free_disk_stats(disk); | |
468 | kfree(disk); | |
469 | } | |
470 | ||
471 | static struct kobj_type ktype_block = { | |
472 | .release = disk_release, | |
473 | .sysfs_ops = &disk_sysfs_ops, | |
474 | .default_attrs = default_attrs, | |
475 | }; | |
476 | ||
477 | extern struct kobj_type ktype_part; | |
478 | ||
312c004d | 479 | static int block_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
480 | { |
481 | struct kobj_type *ktype = get_ktype(kobj); | |
482 | ||
483 | return ((ktype == &ktype_block) || (ktype == &ktype_part)); | |
484 | } | |
485 | ||
312c004d | 486 | static int block_uevent(struct kset *kset, struct kobject *kobj, char **envp, |
1da177e4 LT |
487 | int num_envp, char *buffer, int buffer_size) |
488 | { | |
489 | struct kobj_type *ktype = get_ktype(kobj); | |
490 | struct device *physdev; | |
491 | struct gendisk *disk; | |
492 | struct hd_struct *part; | |
493 | int length = 0; | |
494 | int i = 0; | |
495 | ||
496 | if (ktype == &ktype_block) { | |
497 | disk = container_of(kobj, struct gendisk, kobj); | |
312c004d KS |
498 | add_uevent_var(envp, num_envp, &i, buffer, buffer_size, |
499 | &length, "MINOR=%u", disk->first_minor); | |
1da177e4 LT |
500 | } else if (ktype == &ktype_part) { |
501 | disk = container_of(kobj->parent, struct gendisk, kobj); | |
502 | part = container_of(kobj, struct hd_struct, kobj); | |
312c004d KS |
503 | add_uevent_var(envp, num_envp, &i, buffer, buffer_size, |
504 | &length, "MINOR=%u", | |
505 | disk->first_minor + part->partno); | |
1da177e4 LT |
506 | } else |
507 | return 0; | |
508 | ||
312c004d KS |
509 | add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length, |
510 | "MAJOR=%u", disk->major); | |
1da177e4 LT |
511 | |
512 | /* add physical device, backing this device */ | |
513 | physdev = disk->driverfs_dev; | |
514 | if (physdev) { | |
515 | char *path = kobject_get_path(&physdev->kobj, GFP_KERNEL); | |
516 | ||
312c004d KS |
517 | add_uevent_var(envp, num_envp, &i, buffer, buffer_size, |
518 | &length, "PHYSDEVPATH=%s", path); | |
1da177e4 LT |
519 | kfree(path); |
520 | ||
521 | if (physdev->bus) | |
312c004d KS |
522 | add_uevent_var(envp, num_envp, &i, |
523 | buffer, buffer_size, &length, | |
524 | "PHYSDEVBUS=%s", | |
525 | physdev->bus->name); | |
1da177e4 LT |
526 | |
527 | if (physdev->driver) | |
312c004d KS |
528 | add_uevent_var(envp, num_envp, &i, |
529 | buffer, buffer_size, &length, | |
530 | "PHYSDEVDRIVER=%s", | |
531 | physdev->driver->name); | |
1da177e4 LT |
532 | } |
533 | ||
534 | /* terminate, set to next free slot, shrink available space */ | |
535 | envp[i] = NULL; | |
536 | envp = &envp[i]; | |
537 | num_envp -= i; | |
538 | buffer = &buffer[length]; | |
539 | buffer_size -= length; | |
540 | ||
541 | return 0; | |
542 | } | |
543 | ||
312c004d KS |
544 | static struct kset_uevent_ops block_uevent_ops = { |
545 | .filter = block_uevent_filter, | |
546 | .uevent = block_uevent, | |
1da177e4 LT |
547 | }; |
548 | ||
b9d9c82b | 549 | decl_subsys(block, &ktype_block, &block_uevent_ops); |
1da177e4 LT |
550 | |
551 | /* | |
552 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
553 | * entries do, above, but makes them available through one seq_file. | |
554 | * Watching a few disks may be efficient through sysfs, but watching | |
555 | * all of them will be more efficient through this interface. | |
556 | * | |
557 | * The output looks suspiciously like /proc/partitions with a bunch of | |
558 | * extra fields. | |
559 | */ | |
560 | ||
561 | /* iterator */ | |
562 | static void *diskstats_start(struct seq_file *part, loff_t *pos) | |
563 | { | |
564 | loff_t k = *pos; | |
565 | struct list_head *p; | |
566 | ||
58383af6 | 567 | mutex_lock(&block_subsys_lock); |
1da177e4 LT |
568 | list_for_each(p, &block_subsys.kset.list) |
569 | if (!k--) | |
570 | return list_entry(p, struct gendisk, kobj.entry); | |
571 | return NULL; | |
572 | } | |
573 | ||
574 | static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos) | |
575 | { | |
576 | struct list_head *p = ((struct gendisk *)v)->kobj.entry.next; | |
577 | ++*pos; | |
578 | return p==&block_subsys.kset.list ? NULL : | |
579 | list_entry(p, struct gendisk, kobj.entry); | |
580 | } | |
581 | ||
582 | static void diskstats_stop(struct seq_file *part, void *v) | |
583 | { | |
58383af6 | 584 | mutex_unlock(&block_subsys_lock); |
1da177e4 LT |
585 | } |
586 | ||
587 | static int diskstats_show(struct seq_file *s, void *v) | |
588 | { | |
589 | struct gendisk *gp = v; | |
590 | char buf[BDEVNAME_SIZE]; | |
591 | int n = 0; | |
592 | ||
593 | /* | |
594 | if (&sgp->kobj.entry == block_subsys.kset.list.next) | |
595 | seq_puts(s, "major minor name" | |
596 | " rio rmerge rsect ruse wio wmerge " | |
597 | "wsect wuse running use aveq" | |
598 | "\n\n"); | |
599 | */ | |
600 | ||
601 | preempt_disable(); | |
602 | disk_round_stats(gp); | |
603 | preempt_enable(); | |
837c7878 | 604 | seq_printf(s, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n", |
1da177e4 | 605 | gp->major, n + gp->first_minor, disk_name(gp, n, buf), |
a362357b JA |
606 | disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), |
607 | (unsigned long long)disk_stat_read(gp, sectors[0]), | |
608 | jiffies_to_msecs(disk_stat_read(gp, ticks[0])), | |
609 | disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]), | |
610 | (unsigned long long)disk_stat_read(gp, sectors[1]), | |
611 | jiffies_to_msecs(disk_stat_read(gp, ticks[1])), | |
1da177e4 LT |
612 | gp->in_flight, |
613 | jiffies_to_msecs(disk_stat_read(gp, io_ticks)), | |
614 | jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); | |
615 | ||
616 | /* now show all non-0 size partitions of it */ | |
617 | for (n = 0; n < gp->minors - 1; n++) { | |
618 | struct hd_struct *hd = gp->part[n]; | |
619 | ||
620 | if (hd && hd->nr_sects) | |
621 | seq_printf(s, "%4d %4d %s %u %u %u %u\n", | |
622 | gp->major, n + gp->first_minor + 1, | |
623 | disk_name(gp, n + 1, buf), | |
a362357b JA |
624 | hd->ios[0], hd->sectors[0], |
625 | hd->ios[1], hd->sectors[1]); | |
1da177e4 LT |
626 | } |
627 | ||
628 | return 0; | |
629 | } | |
630 | ||
631 | struct seq_operations diskstats_op = { | |
632 | .start = diskstats_start, | |
633 | .next = diskstats_next, | |
634 | .stop = diskstats_stop, | |
635 | .show = diskstats_show | |
636 | }; | |
637 | ||
1da177e4 LT |
638 | struct gendisk *alloc_disk(int minors) |
639 | { | |
1946089a CL |
640 | return alloc_disk_node(minors, -1); |
641 | } | |
642 | ||
643 | struct gendisk *alloc_disk_node(int minors, int node_id) | |
644 | { | |
645 | struct gendisk *disk; | |
646 | ||
647 | disk = kmalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id); | |
1da177e4 LT |
648 | if (disk) { |
649 | memset(disk, 0, sizeof(struct gendisk)); | |
650 | if (!init_disk_stats(disk)) { | |
651 | kfree(disk); | |
652 | return NULL; | |
653 | } | |
654 | if (minors > 1) { | |
655 | int size = (minors - 1) * sizeof(struct hd_struct *); | |
1946089a | 656 | disk->part = kmalloc_node(size, GFP_KERNEL, node_id); |
1da177e4 LT |
657 | if (!disk->part) { |
658 | kfree(disk); | |
659 | return NULL; | |
660 | } | |
661 | memset(disk->part, 0, size); | |
662 | } | |
663 | disk->minors = minors; | |
664 | kobj_set_kset_s(disk,block_subsys); | |
665 | kobject_init(&disk->kobj); | |
666 | rand_initialize_disk(disk); | |
667 | } | |
668 | return disk; | |
669 | } | |
670 | ||
671 | EXPORT_SYMBOL(alloc_disk); | |
1946089a | 672 | EXPORT_SYMBOL(alloc_disk_node); |
1da177e4 LT |
673 | |
674 | struct kobject *get_disk(struct gendisk *disk) | |
675 | { | |
676 | struct module *owner; | |
677 | struct kobject *kobj; | |
678 | ||
679 | if (!disk->fops) | |
680 | return NULL; | |
681 | owner = disk->fops->owner; | |
682 | if (owner && !try_module_get(owner)) | |
683 | return NULL; | |
684 | kobj = kobject_get(&disk->kobj); | |
685 | if (kobj == NULL) { | |
686 | module_put(owner); | |
687 | return NULL; | |
688 | } | |
689 | return kobj; | |
690 | ||
691 | } | |
692 | ||
693 | EXPORT_SYMBOL(get_disk); | |
694 | ||
695 | void put_disk(struct gendisk *disk) | |
696 | { | |
697 | if (disk) | |
698 | kobject_put(&disk->kobj); | |
699 | } | |
700 | ||
701 | EXPORT_SYMBOL(put_disk); | |
702 | ||
703 | void set_device_ro(struct block_device *bdev, int flag) | |
704 | { | |
705 | if (bdev->bd_contains != bdev) | |
706 | bdev->bd_part->policy = flag; | |
707 | else | |
708 | bdev->bd_disk->policy = flag; | |
709 | } | |
710 | ||
711 | EXPORT_SYMBOL(set_device_ro); | |
712 | ||
713 | void set_disk_ro(struct gendisk *disk, int flag) | |
714 | { | |
715 | int i; | |
716 | disk->policy = flag; | |
717 | for (i = 0; i < disk->minors - 1; i++) | |
718 | if (disk->part[i]) disk->part[i]->policy = flag; | |
719 | } | |
720 | ||
721 | EXPORT_SYMBOL(set_disk_ro); | |
722 | ||
723 | int bdev_read_only(struct block_device *bdev) | |
724 | { | |
725 | if (!bdev) | |
726 | return 0; | |
727 | else if (bdev->bd_contains != bdev) | |
728 | return bdev->bd_part->policy; | |
729 | else | |
730 | return bdev->bd_disk->policy; | |
731 | } | |
732 | ||
733 | EXPORT_SYMBOL(bdev_read_only); | |
734 | ||
735 | int invalidate_partition(struct gendisk *disk, int index) | |
736 | { | |
737 | int res = 0; | |
738 | struct block_device *bdev = bdget_disk(disk, index); | |
739 | if (bdev) { | |
2ef41634 CH |
740 | fsync_bdev(bdev); |
741 | res = __invalidate_device(bdev); | |
1da177e4 LT |
742 | bdput(bdev); |
743 | } | |
744 | return res; | |
745 | } | |
746 | ||
747 | EXPORT_SYMBOL(invalidate_partition); |