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Commit | Line | Data |
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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> | |
8 | #include <linux/kernel.h> | |
9 | #include <linux/blkdev.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/spinlock.h> | |
12 | #include <linux/seq_file.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/kmod.h> | |
15 | #include <linux/kobj_map.h> | |
2ef41634 | 16 | #include <linux/buffer_head.h> |
58383af6 | 17 | #include <linux/mutex.h> |
1da177e4 | 18 | |
b9d9c82b | 19 | struct subsystem block_subsys; |
58383af6 | 20 | static DEFINE_MUTEX(block_subsys_lock); |
1da177e4 LT |
21 | |
22 | /* | |
23 | * Can be deleted altogether. Later. | |
24 | * | |
25 | */ | |
26 | static struct blk_major_name { | |
27 | struct blk_major_name *next; | |
28 | int major; | |
29 | char name[16]; | |
68eef3b4 | 30 | } *major_names[BLKDEV_MAJOR_HASH_SIZE]; |
1da177e4 LT |
31 | |
32 | /* index in the above - for now: assume no multimajor ranges */ | |
33 | static inline int major_to_index(int major) | |
34 | { | |
68eef3b4 | 35 | return major % BLKDEV_MAJOR_HASH_SIZE; |
7170be5f NH |
36 | } |
37 | ||
68eef3b4 | 38 | #ifdef CONFIG_PROC_FS |
7170be5f | 39 | |
68eef3b4 | 40 | void blkdev_show(struct seq_file *f, off_t offset) |
7170be5f | 41 | { |
68eef3b4 | 42 | struct blk_major_name *dp; |
7170be5f | 43 | |
68eef3b4 JK |
44 | if (offset < BLKDEV_MAJOR_HASH_SIZE) { |
45 | mutex_lock(&block_subsys_lock); | |
46 | for (dp = major_names[offset]; dp; dp = dp->next) | |
47 | seq_printf(f, "%3d %s\n", dp->major, dp->name); | |
48 | mutex_unlock(&block_subsys_lock); | |
1da177e4 | 49 | } |
1da177e4 | 50 | } |
7170be5f | 51 | |
68eef3b4 | 52 | #endif /* CONFIG_PROC_FS */ |
1da177e4 LT |
53 | |
54 | int register_blkdev(unsigned int major, const char *name) | |
55 | { | |
56 | struct blk_major_name **n, *p; | |
57 | int index, ret = 0; | |
58 | ||
58383af6 | 59 | mutex_lock(&block_subsys_lock); |
1da177e4 LT |
60 | |
61 | /* temporary */ | |
62 | if (major == 0) { | |
63 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { | |
fdf892be AM |
64 | /* |
65 | * Disallow the LANANA-assigned LOCAL/EXPERIMENTAL | |
66 | * majors | |
67 | */ | |
68 | if ((60 <= index && index <= 63) || | |
69 | (120 <= index && index <= 127) || | |
70 | (240 <= index && index <= 254)) | |
71 | continue; | |
1da177e4 LT |
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: | |
58383af6 | 112 | mutex_unlock(&block_subsys_lock); |
1da177e4 LT |
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 | ||
58383af6 | 126 | mutex_lock(&block_subsys_lock); |
1da177e4 LT |
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 | } | |
58383af6 | 136 | mutex_unlock(&block_subsys_lock); |
1da177e4 LT |
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 | ||
58383af6 | 230 | mutex_lock(&block_subsys_lock); |
1da177e4 LT |
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 | { | |
58383af6 | 247 | mutex_unlock(&block_subsys_lock); |
1da177e4 LT |
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 | { | |
87a57261 RD |
306 | int err; |
307 | ||
58383af6 | 308 | bdev_map = kobj_map_init(base_probe, &block_subsys_lock); |
1da177e4 | 309 | blk_dev_init(); |
87a57261 RD |
310 | err = subsystem_register(&block_subsys); |
311 | if (err < 0) | |
312 | printk(KERN_WARNING "%s: subsystem_register error: %d\n", | |
313 | __FUNCTION__, err); | |
314 | return err; | |
1da177e4 LT |
315 | } |
316 | ||
317 | subsys_initcall(genhd_device_init); | |
318 | ||
319 | ||
320 | ||
321 | /* | |
322 | * kobject & sysfs bindings for block devices | |
323 | */ | |
324 | static ssize_t disk_attr_show(struct kobject *kobj, struct attribute *attr, | |
325 | char *page) | |
326 | { | |
327 | struct gendisk *disk = to_disk(kobj); | |
328 | struct disk_attribute *disk_attr = | |
329 | container_of(attr,struct disk_attribute,attr); | |
6c1852a0 | 330 | ssize_t ret = -EIO; |
1da177e4 LT |
331 | |
332 | if (disk_attr->show) | |
333 | ret = disk_attr->show(disk,page); | |
334 | return ret; | |
335 | } | |
336 | ||
a7fd6706 KS |
337 | static ssize_t disk_attr_store(struct kobject * kobj, struct attribute * attr, |
338 | const char *page, size_t count) | |
339 | { | |
340 | struct gendisk *disk = to_disk(kobj); | |
341 | struct disk_attribute *disk_attr = | |
342 | container_of(attr,struct disk_attribute,attr); | |
343 | ssize_t ret = 0; | |
344 | ||
345 | if (disk_attr->store) | |
346 | ret = disk_attr->store(disk, page, count); | |
347 | return ret; | |
348 | } | |
349 | ||
1da177e4 LT |
350 | static struct sysfs_ops disk_sysfs_ops = { |
351 | .show = &disk_attr_show, | |
a7fd6706 | 352 | .store = &disk_attr_store, |
1da177e4 LT |
353 | }; |
354 | ||
a7fd6706 KS |
355 | static ssize_t disk_uevent_store(struct gendisk * disk, |
356 | const char *buf, size_t count) | |
357 | { | |
312c004d | 358 | kobject_uevent(&disk->kobj, KOBJ_ADD); |
a7fd6706 KS |
359 | return count; |
360 | } | |
1da177e4 LT |
361 | static ssize_t disk_dev_read(struct gendisk * disk, char *page) |
362 | { | |
363 | dev_t base = MKDEV(disk->major, disk->first_minor); | |
364 | return print_dev_t(page, base); | |
365 | } | |
366 | static ssize_t disk_range_read(struct gendisk * disk, char *page) | |
367 | { | |
368 | return sprintf(page, "%d\n", disk->minors); | |
369 | } | |
370 | static ssize_t disk_removable_read(struct gendisk * disk, char *page) | |
371 | { | |
372 | return sprintf(page, "%d\n", | |
373 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
374 | ||
375 | } | |
376 | static ssize_t disk_size_read(struct gendisk * disk, char *page) | |
377 | { | |
378 | return sprintf(page, "%llu\n", (unsigned long long)get_capacity(disk)); | |
379 | } | |
380 | ||
381 | static ssize_t disk_stats_read(struct gendisk * disk, char *page) | |
382 | { | |
383 | preempt_disable(); | |
384 | disk_round_stats(disk); | |
385 | preempt_enable(); | |
386 | return sprintf(page, | |
837c7878 BW |
387 | "%8lu %8lu %8llu %8u " |
388 | "%8lu %8lu %8llu %8u " | |
1da177e4 LT |
389 | "%8u %8u %8u" |
390 | "\n", | |
47a00410 JA |
391 | disk_stat_read(disk, ios[READ]), |
392 | disk_stat_read(disk, merges[READ]), | |
393 | (unsigned long long)disk_stat_read(disk, sectors[READ]), | |
394 | jiffies_to_msecs(disk_stat_read(disk, ticks[READ])), | |
395 | disk_stat_read(disk, ios[WRITE]), | |
396 | disk_stat_read(disk, merges[WRITE]), | |
397 | (unsigned long long)disk_stat_read(disk, sectors[WRITE]), | |
398 | jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])), | |
1da177e4 LT |
399 | disk->in_flight, |
400 | jiffies_to_msecs(disk_stat_read(disk, io_ticks)), | |
401 | jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); | |
402 | } | |
a7fd6706 KS |
403 | static struct disk_attribute disk_attr_uevent = { |
404 | .attr = {.name = "uevent", .mode = S_IWUSR }, | |
405 | .store = disk_uevent_store | |
406 | }; | |
1da177e4 LT |
407 | static struct disk_attribute disk_attr_dev = { |
408 | .attr = {.name = "dev", .mode = S_IRUGO }, | |
409 | .show = disk_dev_read | |
410 | }; | |
411 | static struct disk_attribute disk_attr_range = { | |
412 | .attr = {.name = "range", .mode = S_IRUGO }, | |
413 | .show = disk_range_read | |
414 | }; | |
415 | static struct disk_attribute disk_attr_removable = { | |
416 | .attr = {.name = "removable", .mode = S_IRUGO }, | |
417 | .show = disk_removable_read | |
418 | }; | |
419 | static struct disk_attribute disk_attr_size = { | |
420 | .attr = {.name = "size", .mode = S_IRUGO }, | |
421 | .show = disk_size_read | |
422 | }; | |
423 | static struct disk_attribute disk_attr_stat = { | |
424 | .attr = {.name = "stat", .mode = S_IRUGO }, | |
425 | .show = disk_stats_read | |
426 | }; | |
427 | ||
c17bb495 AM |
428 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
429 | ||
430 | static ssize_t disk_fail_store(struct gendisk * disk, | |
431 | const char *buf, size_t count) | |
432 | { | |
433 | int i; | |
434 | ||
435 | if (count > 0 && sscanf(buf, "%d", &i) > 0) { | |
436 | if (i == 0) | |
437 | disk->flags &= ~GENHD_FL_FAIL; | |
438 | else | |
439 | disk->flags |= GENHD_FL_FAIL; | |
440 | } | |
441 | ||
442 | return count; | |
443 | } | |
444 | static ssize_t disk_fail_read(struct gendisk * disk, char *page) | |
445 | { | |
446 | return sprintf(page, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0); | |
447 | } | |
448 | static struct disk_attribute disk_attr_fail = { | |
449 | .attr = {.name = "make-it-fail", .mode = S_IRUGO | S_IWUSR }, | |
450 | .store = disk_fail_store, | |
451 | .show = disk_fail_read | |
452 | }; | |
453 | ||
454 | #endif | |
455 | ||
1da177e4 | 456 | static struct attribute * default_attrs[] = { |
a7fd6706 | 457 | &disk_attr_uevent.attr, |
1da177e4 LT |
458 | &disk_attr_dev.attr, |
459 | &disk_attr_range.attr, | |
460 | &disk_attr_removable.attr, | |
461 | &disk_attr_size.attr, | |
462 | &disk_attr_stat.attr, | |
c17bb495 AM |
463 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
464 | &disk_attr_fail.attr, | |
465 | #endif | |
1da177e4 LT |
466 | NULL, |
467 | }; | |
468 | ||
469 | static void disk_release(struct kobject * kobj) | |
470 | { | |
471 | struct gendisk *disk = to_disk(kobj); | |
472 | kfree(disk->random); | |
473 | kfree(disk->part); | |
474 | free_disk_stats(disk); | |
475 | kfree(disk); | |
476 | } | |
477 | ||
478 | static struct kobj_type ktype_block = { | |
479 | .release = disk_release, | |
480 | .sysfs_ops = &disk_sysfs_ops, | |
481 | .default_attrs = default_attrs, | |
482 | }; | |
483 | ||
484 | extern struct kobj_type ktype_part; | |
485 | ||
312c004d | 486 | static int block_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
487 | { |
488 | struct kobj_type *ktype = get_ktype(kobj); | |
489 | ||
490 | return ((ktype == &ktype_block) || (ktype == &ktype_part)); | |
491 | } | |
492 | ||
312c004d | 493 | static int block_uevent(struct kset *kset, struct kobject *kobj, char **envp, |
1da177e4 LT |
494 | int num_envp, char *buffer, int buffer_size) |
495 | { | |
496 | struct kobj_type *ktype = get_ktype(kobj); | |
497 | struct device *physdev; | |
498 | struct gendisk *disk; | |
499 | struct hd_struct *part; | |
500 | int length = 0; | |
501 | int i = 0; | |
502 | ||
503 | if (ktype == &ktype_block) { | |
504 | disk = container_of(kobj, struct gendisk, kobj); | |
312c004d KS |
505 | add_uevent_var(envp, num_envp, &i, buffer, buffer_size, |
506 | &length, "MINOR=%u", disk->first_minor); | |
1da177e4 LT |
507 | } else if (ktype == &ktype_part) { |
508 | disk = container_of(kobj->parent, struct gendisk, kobj); | |
509 | part = container_of(kobj, struct hd_struct, kobj); | |
312c004d KS |
510 | add_uevent_var(envp, num_envp, &i, buffer, buffer_size, |
511 | &length, "MINOR=%u", | |
512 | disk->first_minor + part->partno); | |
1da177e4 LT |
513 | } else |
514 | return 0; | |
515 | ||
312c004d KS |
516 | add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length, |
517 | "MAJOR=%u", disk->major); | |
1da177e4 LT |
518 | |
519 | /* add physical device, backing this device */ | |
520 | physdev = disk->driverfs_dev; | |
521 | if (physdev) { | |
522 | char *path = kobject_get_path(&physdev->kobj, GFP_KERNEL); | |
523 | ||
312c004d KS |
524 | add_uevent_var(envp, num_envp, &i, buffer, buffer_size, |
525 | &length, "PHYSDEVPATH=%s", path); | |
1da177e4 LT |
526 | kfree(path); |
527 | ||
528 | if (physdev->bus) | |
312c004d KS |
529 | add_uevent_var(envp, num_envp, &i, |
530 | buffer, buffer_size, &length, | |
531 | "PHYSDEVBUS=%s", | |
532 | physdev->bus->name); | |
1da177e4 LT |
533 | |
534 | if (physdev->driver) | |
312c004d KS |
535 | add_uevent_var(envp, num_envp, &i, |
536 | buffer, buffer_size, &length, | |
537 | "PHYSDEVDRIVER=%s", | |
538 | physdev->driver->name); | |
1da177e4 LT |
539 | } |
540 | ||
541 | /* terminate, set to next free slot, shrink available space */ | |
542 | envp[i] = NULL; | |
543 | envp = &envp[i]; | |
544 | num_envp -= i; | |
545 | buffer = &buffer[length]; | |
546 | buffer_size -= length; | |
547 | ||
548 | return 0; | |
549 | } | |
550 | ||
312c004d KS |
551 | static struct kset_uevent_ops block_uevent_ops = { |
552 | .filter = block_uevent_filter, | |
553 | .uevent = block_uevent, | |
1da177e4 LT |
554 | }; |
555 | ||
b9d9c82b | 556 | decl_subsys(block, &ktype_block, &block_uevent_ops); |
1da177e4 LT |
557 | |
558 | /* | |
559 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
560 | * entries do, above, but makes them available through one seq_file. | |
561 | * Watching a few disks may be efficient through sysfs, but watching | |
562 | * all of them will be more efficient through this interface. | |
563 | * | |
564 | * The output looks suspiciously like /proc/partitions with a bunch of | |
565 | * extra fields. | |
566 | */ | |
567 | ||
568 | /* iterator */ | |
569 | static void *diskstats_start(struct seq_file *part, loff_t *pos) | |
570 | { | |
571 | loff_t k = *pos; | |
572 | struct list_head *p; | |
573 | ||
58383af6 | 574 | mutex_lock(&block_subsys_lock); |
1da177e4 LT |
575 | list_for_each(p, &block_subsys.kset.list) |
576 | if (!k--) | |
577 | return list_entry(p, struct gendisk, kobj.entry); | |
578 | return NULL; | |
579 | } | |
580 | ||
581 | static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos) | |
582 | { | |
583 | struct list_head *p = ((struct gendisk *)v)->kobj.entry.next; | |
584 | ++*pos; | |
585 | return p==&block_subsys.kset.list ? NULL : | |
586 | list_entry(p, struct gendisk, kobj.entry); | |
587 | } | |
588 | ||
589 | static void diskstats_stop(struct seq_file *part, void *v) | |
590 | { | |
58383af6 | 591 | mutex_unlock(&block_subsys_lock); |
1da177e4 LT |
592 | } |
593 | ||
594 | static int diskstats_show(struct seq_file *s, void *v) | |
595 | { | |
596 | struct gendisk *gp = v; | |
597 | char buf[BDEVNAME_SIZE]; | |
598 | int n = 0; | |
599 | ||
600 | /* | |
601 | if (&sgp->kobj.entry == block_subsys.kset.list.next) | |
602 | seq_puts(s, "major minor name" | |
603 | " rio rmerge rsect ruse wio wmerge " | |
604 | "wsect wuse running use aveq" | |
605 | "\n\n"); | |
606 | */ | |
607 | ||
608 | preempt_disable(); | |
609 | disk_round_stats(gp); | |
610 | preempt_enable(); | |
837c7878 | 611 | seq_printf(s, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n", |
1da177e4 | 612 | gp->major, n + gp->first_minor, disk_name(gp, n, buf), |
a362357b JA |
613 | disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), |
614 | (unsigned long long)disk_stat_read(gp, sectors[0]), | |
615 | jiffies_to_msecs(disk_stat_read(gp, ticks[0])), | |
616 | disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]), | |
617 | (unsigned long long)disk_stat_read(gp, sectors[1]), | |
618 | jiffies_to_msecs(disk_stat_read(gp, ticks[1])), | |
1da177e4 LT |
619 | gp->in_flight, |
620 | jiffies_to_msecs(disk_stat_read(gp, io_ticks)), | |
621 | jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); | |
622 | ||
623 | /* now show all non-0 size partitions of it */ | |
624 | for (n = 0; n < gp->minors - 1; n++) { | |
625 | struct hd_struct *hd = gp->part[n]; | |
626 | ||
627 | if (hd && hd->nr_sects) | |
628 | seq_printf(s, "%4d %4d %s %u %u %u %u\n", | |
629 | gp->major, n + gp->first_minor + 1, | |
630 | disk_name(gp, n + 1, buf), | |
a362357b JA |
631 | hd->ios[0], hd->sectors[0], |
632 | hd->ios[1], hd->sectors[1]); | |
1da177e4 LT |
633 | } |
634 | ||
635 | return 0; | |
636 | } | |
637 | ||
638 | struct seq_operations diskstats_op = { | |
639 | .start = diskstats_start, | |
640 | .next = diskstats_next, | |
641 | .stop = diskstats_stop, | |
642 | .show = diskstats_show | |
643 | }; | |
644 | ||
1da177e4 LT |
645 | struct gendisk *alloc_disk(int minors) |
646 | { | |
1946089a CL |
647 | return alloc_disk_node(minors, -1); |
648 | } | |
649 | ||
650 | struct gendisk *alloc_disk_node(int minors, int node_id) | |
651 | { | |
652 | struct gendisk *disk; | |
653 | ||
654 | disk = kmalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id); | |
1da177e4 LT |
655 | if (disk) { |
656 | memset(disk, 0, sizeof(struct gendisk)); | |
657 | if (!init_disk_stats(disk)) { | |
658 | kfree(disk); | |
659 | return NULL; | |
660 | } | |
661 | if (minors > 1) { | |
662 | int size = (minors - 1) * sizeof(struct hd_struct *); | |
1946089a | 663 | disk->part = kmalloc_node(size, GFP_KERNEL, node_id); |
1da177e4 LT |
664 | if (!disk->part) { |
665 | kfree(disk); | |
666 | return NULL; | |
667 | } | |
668 | memset(disk->part, 0, size); | |
669 | } | |
670 | disk->minors = minors; | |
671 | kobj_set_kset_s(disk,block_subsys); | |
672 | kobject_init(&disk->kobj); | |
673 | rand_initialize_disk(disk); | |
674 | } | |
675 | return disk; | |
676 | } | |
677 | ||
678 | EXPORT_SYMBOL(alloc_disk); | |
1946089a | 679 | EXPORT_SYMBOL(alloc_disk_node); |
1da177e4 LT |
680 | |
681 | struct kobject *get_disk(struct gendisk *disk) | |
682 | { | |
683 | struct module *owner; | |
684 | struct kobject *kobj; | |
685 | ||
686 | if (!disk->fops) | |
687 | return NULL; | |
688 | owner = disk->fops->owner; | |
689 | if (owner && !try_module_get(owner)) | |
690 | return NULL; | |
691 | kobj = kobject_get(&disk->kobj); | |
692 | if (kobj == NULL) { | |
693 | module_put(owner); | |
694 | return NULL; | |
695 | } | |
696 | return kobj; | |
697 | ||
698 | } | |
699 | ||
700 | EXPORT_SYMBOL(get_disk); | |
701 | ||
702 | void put_disk(struct gendisk *disk) | |
703 | { | |
704 | if (disk) | |
705 | kobject_put(&disk->kobj); | |
706 | } | |
707 | ||
708 | EXPORT_SYMBOL(put_disk); | |
709 | ||
710 | void set_device_ro(struct block_device *bdev, int flag) | |
711 | { | |
712 | if (bdev->bd_contains != bdev) | |
713 | bdev->bd_part->policy = flag; | |
714 | else | |
715 | bdev->bd_disk->policy = flag; | |
716 | } | |
717 | ||
718 | EXPORT_SYMBOL(set_device_ro); | |
719 | ||
720 | void set_disk_ro(struct gendisk *disk, int flag) | |
721 | { | |
722 | int i; | |
723 | disk->policy = flag; | |
724 | for (i = 0; i < disk->minors - 1; i++) | |
725 | if (disk->part[i]) disk->part[i]->policy = flag; | |
726 | } | |
727 | ||
728 | EXPORT_SYMBOL(set_disk_ro); | |
729 | ||
730 | int bdev_read_only(struct block_device *bdev) | |
731 | { | |
732 | if (!bdev) | |
733 | return 0; | |
734 | else if (bdev->bd_contains != bdev) | |
735 | return bdev->bd_part->policy; | |
736 | else | |
737 | return bdev->bd_disk->policy; | |
738 | } | |
739 | ||
740 | EXPORT_SYMBOL(bdev_read_only); | |
741 | ||
742 | int invalidate_partition(struct gendisk *disk, int index) | |
743 | { | |
744 | int res = 0; | |
745 | struct block_device *bdev = bdget_disk(disk, index); | |
746 | if (bdev) { | |
2ef41634 CH |
747 | fsync_bdev(bdev); |
748 | res = __invalidate_device(bdev); | |
1da177e4 LT |
749 | bdput(bdev); |
750 | } | |
751 | return res; | |
752 | } | |
753 | ||
754 | EXPORT_SYMBOL(invalidate_partition); |