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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> | |
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 | |
830d3cfb GKH |
20 | struct kset *block_kset; |
21 | static struct kset_uevent_ops block_uevent_ops; | |
58383af6 | 22 | static DEFINE_MUTEX(block_subsys_lock); |
1da177e4 LT |
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]; | |
68eef3b4 | 32 | } *major_names[BLKDEV_MAJOR_HASH_SIZE]; |
1da177e4 LT |
33 | |
34 | /* index in the above - for now: assume no multimajor ranges */ | |
35 | static inline int major_to_index(int major) | |
36 | { | |
68eef3b4 | 37 | return major % BLKDEV_MAJOR_HASH_SIZE; |
7170be5f NH |
38 | } |
39 | ||
68eef3b4 | 40 | #ifdef CONFIG_PROC_FS |
7170be5f | 41 | |
68eef3b4 | 42 | void blkdev_show(struct seq_file *f, off_t offset) |
7170be5f | 43 | { |
68eef3b4 | 44 | struct blk_major_name *dp; |
7170be5f | 45 | |
68eef3b4 JK |
46 | if (offset < BLKDEV_MAJOR_HASH_SIZE) { |
47 | mutex_lock(&block_subsys_lock); | |
48 | for (dp = major_names[offset]; dp; dp = dp->next) | |
49 | seq_printf(f, "%3d %s\n", dp->major, dp->name); | |
50 | mutex_unlock(&block_subsys_lock); | |
1da177e4 | 51 | } |
1da177e4 | 52 | } |
7170be5f | 53 | |
68eef3b4 | 54 | #endif /* CONFIG_PROC_FS */ |
1da177e4 LT |
55 | |
56 | int register_blkdev(unsigned int major, const char *name) | |
57 | { | |
58 | struct blk_major_name **n, *p; | |
59 | int index, ret = 0; | |
60 | ||
58383af6 | 61 | mutex_lock(&block_subsys_lock); |
1da177e4 LT |
62 | |
63 | /* temporary */ | |
64 | if (major == 0) { | |
65 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { | |
66 | if (major_names[index] == NULL) | |
67 | break; | |
68 | } | |
69 | ||
70 | if (index == 0) { | |
71 | printk("register_blkdev: failed to get major for %s\n", | |
72 | name); | |
73 | ret = -EBUSY; | |
74 | goto out; | |
75 | } | |
76 | major = index; | |
77 | ret = major; | |
78 | } | |
79 | ||
80 | p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); | |
81 | if (p == NULL) { | |
82 | ret = -ENOMEM; | |
83 | goto out; | |
84 | } | |
85 | ||
86 | p->major = major; | |
87 | strlcpy(p->name, name, sizeof(p->name)); | |
88 | p->next = NULL; | |
89 | index = major_to_index(major); | |
90 | ||
91 | for (n = &major_names[index]; *n; n = &(*n)->next) { | |
92 | if ((*n)->major == major) | |
93 | break; | |
94 | } | |
95 | if (!*n) | |
96 | *n = p; | |
97 | else | |
98 | ret = -EBUSY; | |
99 | ||
100 | if (ret < 0) { | |
101 | printk("register_blkdev: cannot get major %d for %s\n", | |
102 | major, name); | |
103 | kfree(p); | |
104 | } | |
105 | out: | |
58383af6 | 106 | mutex_unlock(&block_subsys_lock); |
1da177e4 LT |
107 | return ret; |
108 | } | |
109 | ||
110 | EXPORT_SYMBOL(register_blkdev); | |
111 | ||
f4480240 | 112 | void unregister_blkdev(unsigned int major, const char *name) |
1da177e4 LT |
113 | { |
114 | struct blk_major_name **n; | |
115 | struct blk_major_name *p = NULL; | |
116 | int index = major_to_index(major); | |
1da177e4 | 117 | |
58383af6 | 118 | mutex_lock(&block_subsys_lock); |
1da177e4 LT |
119 | for (n = &major_names[index]; *n; n = &(*n)->next) |
120 | if ((*n)->major == major) | |
121 | break; | |
294462a5 AM |
122 | if (!*n || strcmp((*n)->name, name)) { |
123 | WARN_ON(1); | |
294462a5 | 124 | } else { |
1da177e4 LT |
125 | p = *n; |
126 | *n = p->next; | |
127 | } | |
58383af6 | 128 | mutex_unlock(&block_subsys_lock); |
1da177e4 | 129 | kfree(p); |
1da177e4 LT |
130 | } |
131 | ||
132 | EXPORT_SYMBOL(unregister_blkdev); | |
133 | ||
134 | static struct kobj_map *bdev_map; | |
135 | ||
136 | /* | |
137 | * Register device numbers dev..(dev+range-1) | |
138 | * range must be nonzero | |
139 | * The hash chain is sorted on range, so that subranges can override. | |
140 | */ | |
141 | void blk_register_region(dev_t dev, unsigned long range, struct module *module, | |
142 | struct kobject *(*probe)(dev_t, int *, void *), | |
143 | int (*lock)(dev_t, void *), void *data) | |
144 | { | |
145 | kobj_map(bdev_map, dev, range, module, probe, lock, data); | |
146 | } | |
147 | ||
148 | EXPORT_SYMBOL(blk_register_region); | |
149 | ||
150 | void blk_unregister_region(dev_t dev, unsigned long range) | |
151 | { | |
152 | kobj_unmap(bdev_map, dev, range); | |
153 | } | |
154 | ||
155 | EXPORT_SYMBOL(blk_unregister_region); | |
156 | ||
157 | static struct kobject *exact_match(dev_t dev, int *part, void *data) | |
158 | { | |
159 | struct gendisk *p = data; | |
160 | return &p->kobj; | |
161 | } | |
162 | ||
163 | static int exact_lock(dev_t dev, void *data) | |
164 | { | |
165 | struct gendisk *p = data; | |
166 | ||
167 | if (!get_disk(p)) | |
168 | return -1; | |
169 | return 0; | |
170 | } | |
171 | ||
172 | /** | |
173 | * add_disk - add partitioning information to kernel list | |
174 | * @disk: per-device partitioning information | |
175 | * | |
176 | * This function registers the partitioning information in @disk | |
177 | * with the kernel. | |
178 | */ | |
179 | void add_disk(struct gendisk *disk) | |
180 | { | |
181 | disk->flags |= GENHD_FL_UP; | |
182 | blk_register_region(MKDEV(disk->major, disk->first_minor), | |
183 | disk->minors, NULL, exact_match, exact_lock, disk); | |
184 | register_disk(disk); | |
185 | blk_register_queue(disk); | |
186 | } | |
187 | ||
188 | EXPORT_SYMBOL(add_disk); | |
189 | EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ | |
190 | ||
191 | void unlink_gendisk(struct gendisk *disk) | |
192 | { | |
193 | blk_unregister_queue(disk); | |
194 | blk_unregister_region(MKDEV(disk->major, disk->first_minor), | |
195 | disk->minors); | |
196 | } | |
197 | ||
198 | #define to_disk(obj) container_of(obj,struct gendisk,kobj) | |
199 | ||
200 | /** | |
201 | * get_gendisk - get partitioning information for a given device | |
202 | * @dev: device to get partitioning information for | |
203 | * | |
204 | * This function gets the structure containing partitioning | |
205 | * information for the given device @dev. | |
206 | */ | |
207 | struct gendisk *get_gendisk(dev_t dev, int *part) | |
208 | { | |
209 | struct kobject *kobj = kobj_lookup(bdev_map, dev, part); | |
210 | return kobj ? to_disk(kobj) : NULL; | |
211 | } | |
212 | ||
dd2a345f DG |
213 | /* |
214 | * print a full list of all partitions - intended for places where the root | |
215 | * filesystem can't be mounted and thus to give the victim some idea of what | |
216 | * went wrong | |
217 | */ | |
218 | void __init printk_all_partitions(void) | |
219 | { | |
220 | int n; | |
221 | struct gendisk *sgp; | |
222 | ||
223 | mutex_lock(&block_subsys_lock); | |
224 | /* For each block device... */ | |
830d3cfb | 225 | list_for_each_entry(sgp, &block_kset->list, kobj.entry) { |
dd2a345f DG |
226 | char buf[BDEVNAME_SIZE]; |
227 | /* | |
228 | * Don't show empty devices or things that have been surpressed | |
229 | */ | |
230 | if (get_capacity(sgp) == 0 || | |
231 | (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) | |
232 | continue; | |
233 | ||
234 | /* | |
235 | * Note, unlike /proc/partitions, I am showing the numbers in | |
236 | * hex - the same format as the root= option takes. | |
237 | */ | |
238 | printk("%02x%02x %10llu %s", | |
239 | sgp->major, sgp->first_minor, | |
240 | (unsigned long long)get_capacity(sgp) >> 1, | |
241 | disk_name(sgp, 0, buf)); | |
242 | if (sgp->driverfs_dev != NULL && | |
243 | sgp->driverfs_dev->driver != NULL) | |
244 | printk(" driver: %s\n", | |
245 | sgp->driverfs_dev->driver->name); | |
246 | else | |
247 | printk(" (driver?)\n"); | |
248 | ||
249 | /* now show the partitions */ | |
250 | for (n = 0; n < sgp->minors - 1; ++n) { | |
251 | if (sgp->part[n] == NULL) | |
252 | continue; | |
253 | if (sgp->part[n]->nr_sects == 0) | |
254 | continue; | |
255 | printk(" %02x%02x %10llu %s\n", | |
256 | sgp->major, n + 1 + sgp->first_minor, | |
257 | (unsigned long long)sgp->part[n]->nr_sects >> 1, | |
258 | disk_name(sgp, n + 1, buf)); | |
259 | } /* partition subloop */ | |
260 | } /* Block device loop */ | |
261 | ||
262 | mutex_unlock(&block_subsys_lock); | |
263 | return; | |
264 | } | |
265 | ||
1da177e4 LT |
266 | #ifdef CONFIG_PROC_FS |
267 | /* iterator */ | |
268 | static void *part_start(struct seq_file *part, loff_t *pos) | |
269 | { | |
270 | struct list_head *p; | |
271 | loff_t l = *pos; | |
272 | ||
58383af6 | 273 | mutex_lock(&block_subsys_lock); |
830d3cfb | 274 | list_for_each(p, &block_kset->list) |
1da177e4 LT |
275 | if (!l--) |
276 | return list_entry(p, struct gendisk, kobj.entry); | |
277 | return NULL; | |
278 | } | |
279 | ||
280 | static void *part_next(struct seq_file *part, void *v, loff_t *pos) | |
281 | { | |
282 | struct list_head *p = ((struct gendisk *)v)->kobj.entry.next; | |
283 | ++*pos; | |
830d3cfb | 284 | return p==&block_kset->list ? NULL : |
1da177e4 LT |
285 | list_entry(p, struct gendisk, kobj.entry); |
286 | } | |
287 | ||
288 | static void part_stop(struct seq_file *part, void *v) | |
289 | { | |
58383af6 | 290 | mutex_unlock(&block_subsys_lock); |
1da177e4 LT |
291 | } |
292 | ||
293 | static int show_partition(struct seq_file *part, void *v) | |
294 | { | |
295 | struct gendisk *sgp = v; | |
296 | int n; | |
297 | char buf[BDEVNAME_SIZE]; | |
298 | ||
830d3cfb | 299 | if (&sgp->kobj.entry == block_kset->list.next) |
1da177e4 LT |
300 | seq_puts(part, "major minor #blocks name\n\n"); |
301 | ||
302 | /* Don't show non-partitionable removeable devices or empty devices */ | |
303 | if (!get_capacity(sgp) || | |
304 | (sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE))) | |
305 | return 0; | |
306 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
307 | return 0; | |
308 | ||
309 | /* show the full disk and all non-0 size partitions of it */ | |
310 | seq_printf(part, "%4d %4d %10llu %s\n", | |
311 | sgp->major, sgp->first_minor, | |
312 | (unsigned long long)get_capacity(sgp) >> 1, | |
313 | disk_name(sgp, 0, buf)); | |
314 | for (n = 0; n < sgp->minors - 1; n++) { | |
315 | if (!sgp->part[n]) | |
316 | continue; | |
317 | if (sgp->part[n]->nr_sects == 0) | |
318 | continue; | |
319 | seq_printf(part, "%4d %4d %10llu %s\n", | |
320 | sgp->major, n + 1 + sgp->first_minor, | |
321 | (unsigned long long)sgp->part[n]->nr_sects >> 1 , | |
322 | disk_name(sgp, n + 1, buf)); | |
323 | } | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | struct seq_operations partitions_op = { | |
329 | .start =part_start, | |
330 | .next = part_next, | |
331 | .stop = part_stop, | |
332 | .show = show_partition | |
333 | }; | |
334 | #endif | |
335 | ||
336 | ||
337 | extern int blk_dev_init(void); | |
338 | ||
339 | static struct kobject *base_probe(dev_t dev, int *part, void *data) | |
340 | { | |
341 | if (request_module("block-major-%d-%d", MAJOR(dev), MINOR(dev)) > 0) | |
342 | /* Make old-style 2.4 aliases work */ | |
343 | request_module("block-major-%d", MAJOR(dev)); | |
344 | return NULL; | |
345 | } | |
346 | ||
347 | static int __init genhd_device_init(void) | |
348 | { | |
58383af6 | 349 | bdev_map = kobj_map_init(base_probe, &block_subsys_lock); |
1da177e4 | 350 | blk_dev_init(); |
830d3cfb GKH |
351 | block_kset = kset_create_and_add("block", &block_uevent_ops, NULL); |
352 | if (!block_kset) { | |
353 | printk(KERN_WARNING "%s: kset_create error\n", __FUNCTION__); | |
354 | return -ENOMEM; | |
355 | } | |
356 | return 0; | |
1da177e4 LT |
357 | } |
358 | ||
359 | subsys_initcall(genhd_device_init); | |
360 | ||
361 | ||
362 | ||
363 | /* | |
364 | * kobject & sysfs bindings for block devices | |
365 | */ | |
366 | static ssize_t disk_attr_show(struct kobject *kobj, struct attribute *attr, | |
367 | char *page) | |
368 | { | |
369 | struct gendisk *disk = to_disk(kobj); | |
370 | struct disk_attribute *disk_attr = | |
371 | container_of(attr,struct disk_attribute,attr); | |
6c1852a0 | 372 | ssize_t ret = -EIO; |
1da177e4 LT |
373 | |
374 | if (disk_attr->show) | |
375 | ret = disk_attr->show(disk,page); | |
376 | return ret; | |
377 | } | |
378 | ||
a7fd6706 KS |
379 | static ssize_t disk_attr_store(struct kobject * kobj, struct attribute * attr, |
380 | const char *page, size_t count) | |
381 | { | |
382 | struct gendisk *disk = to_disk(kobj); | |
383 | struct disk_attribute *disk_attr = | |
384 | container_of(attr,struct disk_attribute,attr); | |
385 | ssize_t ret = 0; | |
386 | ||
387 | if (disk_attr->store) | |
388 | ret = disk_attr->store(disk, page, count); | |
389 | return ret; | |
390 | } | |
391 | ||
1da177e4 LT |
392 | static struct sysfs_ops disk_sysfs_ops = { |
393 | .show = &disk_attr_show, | |
a7fd6706 | 394 | .store = &disk_attr_store, |
1da177e4 LT |
395 | }; |
396 | ||
a7fd6706 KS |
397 | static ssize_t disk_uevent_store(struct gendisk * disk, |
398 | const char *buf, size_t count) | |
399 | { | |
312c004d | 400 | kobject_uevent(&disk->kobj, KOBJ_ADD); |
a7fd6706 KS |
401 | return count; |
402 | } | |
1da177e4 LT |
403 | static ssize_t disk_dev_read(struct gendisk * disk, char *page) |
404 | { | |
405 | dev_t base = MKDEV(disk->major, disk->first_minor); | |
406 | return print_dev_t(page, base); | |
407 | } | |
408 | static ssize_t disk_range_read(struct gendisk * disk, char *page) | |
409 | { | |
410 | return sprintf(page, "%d\n", disk->minors); | |
411 | } | |
412 | static ssize_t disk_removable_read(struct gendisk * disk, char *page) | |
413 | { | |
414 | return sprintf(page, "%d\n", | |
415 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
416 | ||
417 | } | |
418 | static ssize_t disk_size_read(struct gendisk * disk, char *page) | |
419 | { | |
420 | return sprintf(page, "%llu\n", (unsigned long long)get_capacity(disk)); | |
421 | } | |
86ce18d7 KCA |
422 | static ssize_t disk_capability_read(struct gendisk *disk, char *page) |
423 | { | |
424 | return sprintf(page, "%x\n", disk->flags); | |
425 | } | |
1da177e4 LT |
426 | static ssize_t disk_stats_read(struct gendisk * disk, char *page) |
427 | { | |
428 | preempt_disable(); | |
429 | disk_round_stats(disk); | |
430 | preempt_enable(); | |
431 | return sprintf(page, | |
837c7878 BW |
432 | "%8lu %8lu %8llu %8u " |
433 | "%8lu %8lu %8llu %8u " | |
1da177e4 LT |
434 | "%8u %8u %8u" |
435 | "\n", | |
47a00410 JA |
436 | disk_stat_read(disk, ios[READ]), |
437 | disk_stat_read(disk, merges[READ]), | |
438 | (unsigned long long)disk_stat_read(disk, sectors[READ]), | |
439 | jiffies_to_msecs(disk_stat_read(disk, ticks[READ])), | |
440 | disk_stat_read(disk, ios[WRITE]), | |
441 | disk_stat_read(disk, merges[WRITE]), | |
442 | (unsigned long long)disk_stat_read(disk, sectors[WRITE]), | |
443 | jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])), | |
1da177e4 LT |
444 | disk->in_flight, |
445 | jiffies_to_msecs(disk_stat_read(disk, io_ticks)), | |
446 | jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); | |
447 | } | |
a7fd6706 KS |
448 | static struct disk_attribute disk_attr_uevent = { |
449 | .attr = {.name = "uevent", .mode = S_IWUSR }, | |
450 | .store = disk_uevent_store | |
451 | }; | |
1da177e4 LT |
452 | static struct disk_attribute disk_attr_dev = { |
453 | .attr = {.name = "dev", .mode = S_IRUGO }, | |
454 | .show = disk_dev_read | |
455 | }; | |
456 | static struct disk_attribute disk_attr_range = { | |
457 | .attr = {.name = "range", .mode = S_IRUGO }, | |
458 | .show = disk_range_read | |
459 | }; | |
460 | static struct disk_attribute disk_attr_removable = { | |
461 | .attr = {.name = "removable", .mode = S_IRUGO }, | |
462 | .show = disk_removable_read | |
463 | }; | |
464 | static struct disk_attribute disk_attr_size = { | |
465 | .attr = {.name = "size", .mode = S_IRUGO }, | |
466 | .show = disk_size_read | |
467 | }; | |
86ce18d7 KCA |
468 | static struct disk_attribute disk_attr_capability = { |
469 | .attr = {.name = "capability", .mode = S_IRUGO }, | |
470 | .show = disk_capability_read | |
471 | }; | |
1da177e4 LT |
472 | static struct disk_attribute disk_attr_stat = { |
473 | .attr = {.name = "stat", .mode = S_IRUGO }, | |
474 | .show = disk_stats_read | |
475 | }; | |
476 | ||
c17bb495 AM |
477 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
478 | ||
479 | static ssize_t disk_fail_store(struct gendisk * disk, | |
480 | const char *buf, size_t count) | |
481 | { | |
482 | int i; | |
483 | ||
484 | if (count > 0 && sscanf(buf, "%d", &i) > 0) { | |
485 | if (i == 0) | |
486 | disk->flags &= ~GENHD_FL_FAIL; | |
487 | else | |
488 | disk->flags |= GENHD_FL_FAIL; | |
489 | } | |
490 | ||
491 | return count; | |
492 | } | |
493 | static ssize_t disk_fail_read(struct gendisk * disk, char *page) | |
494 | { | |
495 | return sprintf(page, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0); | |
496 | } | |
497 | static struct disk_attribute disk_attr_fail = { | |
498 | .attr = {.name = "make-it-fail", .mode = S_IRUGO | S_IWUSR }, | |
499 | .store = disk_fail_store, | |
500 | .show = disk_fail_read | |
501 | }; | |
502 | ||
503 | #endif | |
504 | ||
1da177e4 | 505 | static struct attribute * default_attrs[] = { |
a7fd6706 | 506 | &disk_attr_uevent.attr, |
1da177e4 LT |
507 | &disk_attr_dev.attr, |
508 | &disk_attr_range.attr, | |
509 | &disk_attr_removable.attr, | |
510 | &disk_attr_size.attr, | |
511 | &disk_attr_stat.attr, | |
86ce18d7 | 512 | &disk_attr_capability.attr, |
c17bb495 AM |
513 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
514 | &disk_attr_fail.attr, | |
515 | #endif | |
1da177e4 LT |
516 | NULL, |
517 | }; | |
518 | ||
519 | static void disk_release(struct kobject * kobj) | |
520 | { | |
521 | struct gendisk *disk = to_disk(kobj); | |
522 | kfree(disk->random); | |
523 | kfree(disk->part); | |
524 | free_disk_stats(disk); | |
525 | kfree(disk); | |
526 | } | |
527 | ||
528 | static struct kobj_type ktype_block = { | |
529 | .release = disk_release, | |
530 | .sysfs_ops = &disk_sysfs_ops, | |
531 | .default_attrs = default_attrs, | |
532 | }; | |
533 | ||
534 | extern struct kobj_type ktype_part; | |
535 | ||
312c004d | 536 | static int block_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
537 | { |
538 | struct kobj_type *ktype = get_ktype(kobj); | |
539 | ||
540 | return ((ktype == &ktype_block) || (ktype == &ktype_part)); | |
541 | } | |
542 | ||
7eff2e7a KS |
543 | static int block_uevent(struct kset *kset, struct kobject *kobj, |
544 | struct kobj_uevent_env *env) | |
1da177e4 LT |
545 | { |
546 | struct kobj_type *ktype = get_ktype(kobj); | |
547 | struct device *physdev; | |
548 | struct gendisk *disk; | |
549 | struct hd_struct *part; | |
1da177e4 LT |
550 | |
551 | if (ktype == &ktype_block) { | |
552 | disk = container_of(kobj, struct gendisk, kobj); | |
7eff2e7a | 553 | add_uevent_var(env, "MINOR=%u", disk->first_minor); |
1da177e4 LT |
554 | } else if (ktype == &ktype_part) { |
555 | disk = container_of(kobj->parent, struct gendisk, kobj); | |
556 | part = container_of(kobj, struct hd_struct, kobj); | |
7eff2e7a | 557 | add_uevent_var(env, "MINOR=%u", |
312c004d | 558 | disk->first_minor + part->partno); |
1da177e4 LT |
559 | } else |
560 | return 0; | |
561 | ||
7eff2e7a | 562 | add_uevent_var(env, "MAJOR=%u", disk->major); |
1da177e4 LT |
563 | |
564 | /* add physical device, backing this device */ | |
565 | physdev = disk->driverfs_dev; | |
566 | if (physdev) { | |
567 | char *path = kobject_get_path(&physdev->kobj, GFP_KERNEL); | |
568 | ||
7eff2e7a | 569 | add_uevent_var(env, "PHYSDEVPATH=%s", path); |
1da177e4 LT |
570 | kfree(path); |
571 | ||
572 | if (physdev->bus) | |
7eff2e7a | 573 | add_uevent_var(env, "PHYSDEVBUS=%s", physdev->bus->name); |
1da177e4 LT |
574 | |
575 | if (physdev->driver) | |
7eff2e7a | 576 | add_uevent_var(env, physdev->driver->name); |
1da177e4 LT |
577 | } |
578 | ||
1da177e4 LT |
579 | return 0; |
580 | } | |
581 | ||
312c004d KS |
582 | static struct kset_uevent_ops block_uevent_ops = { |
583 | .filter = block_uevent_filter, | |
584 | .uevent = block_uevent, | |
1da177e4 LT |
585 | }; |
586 | ||
1da177e4 LT |
587 | /* |
588 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
589 | * entries do, above, but makes them available through one seq_file. | |
590 | * Watching a few disks may be efficient through sysfs, but watching | |
591 | * all of them will be more efficient through this interface. | |
592 | * | |
593 | * The output looks suspiciously like /proc/partitions with a bunch of | |
594 | * extra fields. | |
595 | */ | |
596 | ||
597 | /* iterator */ | |
598 | static void *diskstats_start(struct seq_file *part, loff_t *pos) | |
599 | { | |
600 | loff_t k = *pos; | |
601 | struct list_head *p; | |
602 | ||
58383af6 | 603 | mutex_lock(&block_subsys_lock); |
830d3cfb | 604 | list_for_each(p, &block_kset->list) |
1da177e4 LT |
605 | if (!k--) |
606 | return list_entry(p, struct gendisk, kobj.entry); | |
607 | return NULL; | |
608 | } | |
609 | ||
610 | static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos) | |
611 | { | |
612 | struct list_head *p = ((struct gendisk *)v)->kobj.entry.next; | |
613 | ++*pos; | |
830d3cfb | 614 | return p==&block_kset->list ? NULL : |
1da177e4 LT |
615 | list_entry(p, struct gendisk, kobj.entry); |
616 | } | |
617 | ||
618 | static void diskstats_stop(struct seq_file *part, void *v) | |
619 | { | |
58383af6 | 620 | mutex_unlock(&block_subsys_lock); |
1da177e4 LT |
621 | } |
622 | ||
623 | static int diskstats_show(struct seq_file *s, void *v) | |
624 | { | |
625 | struct gendisk *gp = v; | |
626 | char buf[BDEVNAME_SIZE]; | |
627 | int n = 0; | |
628 | ||
629 | /* | |
830d3cfb | 630 | if (&sgp->kobj.entry == block_kset->list.next) |
1da177e4 LT |
631 | seq_puts(s, "major minor name" |
632 | " rio rmerge rsect ruse wio wmerge " | |
633 | "wsect wuse running use aveq" | |
634 | "\n\n"); | |
635 | */ | |
636 | ||
637 | preempt_disable(); | |
638 | disk_round_stats(gp); | |
639 | preempt_enable(); | |
837c7878 | 640 | seq_printf(s, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n", |
1da177e4 | 641 | gp->major, n + gp->first_minor, disk_name(gp, n, buf), |
a362357b JA |
642 | disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), |
643 | (unsigned long long)disk_stat_read(gp, sectors[0]), | |
644 | jiffies_to_msecs(disk_stat_read(gp, ticks[0])), | |
645 | disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]), | |
646 | (unsigned long long)disk_stat_read(gp, sectors[1]), | |
647 | jiffies_to_msecs(disk_stat_read(gp, ticks[1])), | |
1da177e4 LT |
648 | gp->in_flight, |
649 | jiffies_to_msecs(disk_stat_read(gp, io_ticks)), | |
650 | jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); | |
651 | ||
652 | /* now show all non-0 size partitions of it */ | |
653 | for (n = 0; n < gp->minors - 1; n++) { | |
654 | struct hd_struct *hd = gp->part[n]; | |
655 | ||
656 | if (hd && hd->nr_sects) | |
657 | seq_printf(s, "%4d %4d %s %u %u %u %u\n", | |
658 | gp->major, n + gp->first_minor + 1, | |
659 | disk_name(gp, n + 1, buf), | |
a362357b JA |
660 | hd->ios[0], hd->sectors[0], |
661 | hd->ios[1], hd->sectors[1]); | |
1da177e4 LT |
662 | } |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
667 | struct seq_operations diskstats_op = { | |
668 | .start = diskstats_start, | |
669 | .next = diskstats_next, | |
670 | .stop = diskstats_stop, | |
671 | .show = diskstats_show | |
672 | }; | |
673 | ||
8ce7ad7b KCA |
674 | static void media_change_notify_thread(struct work_struct *work) |
675 | { | |
676 | struct gendisk *gd = container_of(work, struct gendisk, async_notify); | |
677 | char event[] = "MEDIA_CHANGE=1"; | |
678 | char *envp[] = { event, NULL }; | |
679 | ||
680 | /* | |
681 | * set enviroment vars to indicate which event this is for | |
682 | * so that user space will know to go check the media status. | |
683 | */ | |
684 | kobject_uevent_env(&gd->kobj, KOBJ_CHANGE, envp); | |
685 | put_device(gd->driverfs_dev); | |
686 | } | |
687 | ||
688 | void genhd_media_change_notify(struct gendisk *disk) | |
689 | { | |
690 | get_device(disk->driverfs_dev); | |
691 | schedule_work(&disk->async_notify); | |
692 | } | |
693 | EXPORT_SYMBOL_GPL(genhd_media_change_notify); | |
694 | ||
1da177e4 LT |
695 | struct gendisk *alloc_disk(int minors) |
696 | { | |
1946089a CL |
697 | return alloc_disk_node(minors, -1); |
698 | } | |
699 | ||
700 | struct gendisk *alloc_disk_node(int minors, int node_id) | |
701 | { | |
702 | struct gendisk *disk; | |
703 | ||
94f6030c CL |
704 | disk = kmalloc_node(sizeof(struct gendisk), |
705 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 706 | if (disk) { |
1da177e4 LT |
707 | if (!init_disk_stats(disk)) { |
708 | kfree(disk); | |
709 | return NULL; | |
710 | } | |
711 | if (minors > 1) { | |
712 | int size = (minors - 1) * sizeof(struct hd_struct *); | |
94f6030c CL |
713 | disk->part = kmalloc_node(size, |
714 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 715 | if (!disk->part) { |
c7674030 | 716 | free_disk_stats(disk); |
1da177e4 LT |
717 | kfree(disk); |
718 | return NULL; | |
719 | } | |
1da177e4 LT |
720 | } |
721 | disk->minors = minors; | |
830d3cfb | 722 | disk->kobj.kset = block_kset; |
3514faca | 723 | disk->kobj.ktype = &ktype_block; |
1da177e4 LT |
724 | kobject_init(&disk->kobj); |
725 | rand_initialize_disk(disk); | |
8ce7ad7b KCA |
726 | INIT_WORK(&disk->async_notify, |
727 | media_change_notify_thread); | |
1da177e4 LT |
728 | } |
729 | return disk; | |
730 | } | |
731 | ||
732 | EXPORT_SYMBOL(alloc_disk); | |
1946089a | 733 | EXPORT_SYMBOL(alloc_disk_node); |
1da177e4 LT |
734 | |
735 | struct kobject *get_disk(struct gendisk *disk) | |
736 | { | |
737 | struct module *owner; | |
738 | struct kobject *kobj; | |
739 | ||
740 | if (!disk->fops) | |
741 | return NULL; | |
742 | owner = disk->fops->owner; | |
743 | if (owner && !try_module_get(owner)) | |
744 | return NULL; | |
745 | kobj = kobject_get(&disk->kobj); | |
746 | if (kobj == NULL) { | |
747 | module_put(owner); | |
748 | return NULL; | |
749 | } | |
750 | return kobj; | |
751 | ||
752 | } | |
753 | ||
754 | EXPORT_SYMBOL(get_disk); | |
755 | ||
756 | void put_disk(struct gendisk *disk) | |
757 | { | |
758 | if (disk) | |
759 | kobject_put(&disk->kobj); | |
760 | } | |
761 | ||
762 | EXPORT_SYMBOL(put_disk); | |
763 | ||
764 | void set_device_ro(struct block_device *bdev, int flag) | |
765 | { | |
766 | if (bdev->bd_contains != bdev) | |
767 | bdev->bd_part->policy = flag; | |
768 | else | |
769 | bdev->bd_disk->policy = flag; | |
770 | } | |
771 | ||
772 | EXPORT_SYMBOL(set_device_ro); | |
773 | ||
774 | void set_disk_ro(struct gendisk *disk, int flag) | |
775 | { | |
776 | int i; | |
777 | disk->policy = flag; | |
778 | for (i = 0; i < disk->minors - 1; i++) | |
779 | if (disk->part[i]) disk->part[i]->policy = flag; | |
780 | } | |
781 | ||
782 | EXPORT_SYMBOL(set_disk_ro); | |
783 | ||
784 | int bdev_read_only(struct block_device *bdev) | |
785 | { | |
786 | if (!bdev) | |
787 | return 0; | |
788 | else if (bdev->bd_contains != bdev) | |
789 | return bdev->bd_part->policy; | |
790 | else | |
791 | return bdev->bd_disk->policy; | |
792 | } | |
793 | ||
794 | EXPORT_SYMBOL(bdev_read_only); | |
795 | ||
796 | int invalidate_partition(struct gendisk *disk, int index) | |
797 | { | |
798 | int res = 0; | |
799 | struct block_device *bdev = bdget_disk(disk, index); | |
800 | if (bdev) { | |
2ef41634 CH |
801 | fsync_bdev(bdev); |
802 | res = __invalidate_device(bdev); | |
1da177e4 LT |
803 | bdput(bdev); |
804 | } | |
805 | return res; | |
806 | } | |
807 | ||
808 | EXPORT_SYMBOL(invalidate_partition); |