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1 | /* | |
2 | * gendisk handling | |
3 | */ | |
4 | ||
5 | #include <linux/module.h> | |
6 | #include <linux/fs.h> | |
7 | #include <linux/genhd.h> | |
8 | #include <linux/kdev_t.h> | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/blkdev.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/seq_file.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/kmod.h> | |
16 | #include <linux/kobj_map.h> | |
17 | #include <linux/buffer_head.h> | |
18 | #include <linux/mutex.h> | |
19 | ||
20 | #include "blk.h" | |
21 | ||
22 | static DEFINE_MUTEX(block_class_lock); | |
23 | #ifndef CONFIG_SYSFS_DEPRECATED | |
24 | struct kobject *block_depr; | |
25 | #endif | |
26 | ||
27 | static struct device_type disk_type; | |
28 | ||
29 | /** | |
30 | * disk_get_part - get partition | |
31 | * @disk: disk to look partition from | |
32 | * @partno: partition number | |
33 | * | |
34 | * Look for partition @partno from @disk. If found, increment | |
35 | * reference count and return it. | |
36 | * | |
37 | * CONTEXT: | |
38 | * Don't care. | |
39 | * | |
40 | * RETURNS: | |
41 | * Pointer to the found partition on success, NULL if not found. | |
42 | */ | |
43 | struct hd_struct *disk_get_part(struct gendisk *disk, int partno) | |
44 | { | |
45 | struct hd_struct *part; | |
46 | ||
47 | if (unlikely(partno < 1 || partno > disk_max_parts(disk))) | |
48 | return NULL; | |
49 | rcu_read_lock(); | |
50 | part = rcu_dereference(disk->__part[partno - 1]); | |
51 | if (part) | |
52 | get_device(&part->dev); | |
53 | rcu_read_unlock(); | |
54 | ||
55 | return part; | |
56 | } | |
57 | EXPORT_SYMBOL_GPL(disk_get_part); | |
58 | ||
59 | /** | |
60 | * disk_part_iter_init - initialize partition iterator | |
61 | * @piter: iterator to initialize | |
62 | * @disk: disk to iterate over | |
63 | * @flags: DISK_PITER_* flags | |
64 | * | |
65 | * Initialize @piter so that it iterates over partitions of @disk. | |
66 | * | |
67 | * CONTEXT: | |
68 | * Don't care. | |
69 | */ | |
70 | void disk_part_iter_init(struct disk_part_iter *piter, struct gendisk *disk, | |
71 | unsigned int flags) | |
72 | { | |
73 | piter->disk = disk; | |
74 | piter->part = NULL; | |
75 | ||
76 | if (flags & DISK_PITER_REVERSE) | |
77 | piter->idx = disk_max_parts(piter->disk) - 1; | |
78 | else | |
79 | piter->idx = 0; | |
80 | ||
81 | piter->flags = flags; | |
82 | } | |
83 | EXPORT_SYMBOL_GPL(disk_part_iter_init); | |
84 | ||
85 | /** | |
86 | * disk_part_iter_next - proceed iterator to the next partition and return it | |
87 | * @piter: iterator of interest | |
88 | * | |
89 | * Proceed @piter to the next partition and return it. | |
90 | * | |
91 | * CONTEXT: | |
92 | * Don't care. | |
93 | */ | |
94 | struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter) | |
95 | { | |
96 | int inc, end; | |
97 | ||
98 | /* put the last partition */ | |
99 | disk_put_part(piter->part); | |
100 | piter->part = NULL; | |
101 | ||
102 | rcu_read_lock(); | |
103 | ||
104 | /* determine iteration parameters */ | |
105 | if (piter->flags & DISK_PITER_REVERSE) { | |
106 | inc = -1; | |
107 | end = -1; | |
108 | } else { | |
109 | inc = 1; | |
110 | end = disk_max_parts(piter->disk); | |
111 | } | |
112 | ||
113 | /* iterate to the next partition */ | |
114 | for (; piter->idx != end; piter->idx += inc) { | |
115 | struct hd_struct *part; | |
116 | ||
117 | part = rcu_dereference(piter->disk->__part[piter->idx]); | |
118 | if (!part) | |
119 | continue; | |
120 | if (!(piter->flags & DISK_PITER_INCL_EMPTY) && !part->nr_sects) | |
121 | continue; | |
122 | ||
123 | get_device(&part->dev); | |
124 | piter->part = part; | |
125 | piter->idx += inc; | |
126 | break; | |
127 | } | |
128 | ||
129 | rcu_read_unlock(); | |
130 | ||
131 | return piter->part; | |
132 | } | |
133 | EXPORT_SYMBOL_GPL(disk_part_iter_next); | |
134 | ||
135 | /** | |
136 | * disk_part_iter_exit - finish up partition iteration | |
137 | * @piter: iter of interest | |
138 | * | |
139 | * Called when iteration is over. Cleans up @piter. | |
140 | * | |
141 | * CONTEXT: | |
142 | * Don't care. | |
143 | */ | |
144 | void disk_part_iter_exit(struct disk_part_iter *piter) | |
145 | { | |
146 | disk_put_part(piter->part); | |
147 | piter->part = NULL; | |
148 | } | |
149 | EXPORT_SYMBOL_GPL(disk_part_iter_exit); | |
150 | ||
151 | /** | |
152 | * disk_map_sector_rcu - map sector to partition | |
153 | * @disk: gendisk of interest | |
154 | * @sector: sector to map | |
155 | * | |
156 | * Find out which partition @sector maps to on @disk. This is | |
157 | * primarily used for stats accounting. | |
158 | * | |
159 | * CONTEXT: | |
160 | * RCU read locked. The returned partition pointer is valid only | |
161 | * while preemption is disabled. | |
162 | * | |
163 | * RETURNS: | |
164 | * Found partition on success, NULL if there's no matching partition. | |
165 | */ | |
166 | struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) | |
167 | { | |
168 | int i; | |
169 | ||
170 | for (i = 0; i < disk_max_parts(disk); i++) { | |
171 | struct hd_struct *part = rcu_dereference(disk->__part[i]); | |
172 | ||
173 | if (part && part->start_sect <= sector && | |
174 | sector < part->start_sect + part->nr_sects) | |
175 | return part; | |
176 | } | |
177 | return NULL; | |
178 | } | |
179 | EXPORT_SYMBOL_GPL(disk_map_sector_rcu); | |
180 | ||
181 | /* | |
182 | * Can be deleted altogether. Later. | |
183 | * | |
184 | */ | |
185 | static struct blk_major_name { | |
186 | struct blk_major_name *next; | |
187 | int major; | |
188 | char name[16]; | |
189 | } *major_names[BLKDEV_MAJOR_HASH_SIZE]; | |
190 | ||
191 | /* index in the above - for now: assume no multimajor ranges */ | |
192 | static inline int major_to_index(int major) | |
193 | { | |
194 | return major % BLKDEV_MAJOR_HASH_SIZE; | |
195 | } | |
196 | ||
197 | #ifdef CONFIG_PROC_FS | |
198 | void blkdev_show(struct seq_file *seqf, off_t offset) | |
199 | { | |
200 | struct blk_major_name *dp; | |
201 | ||
202 | if (offset < BLKDEV_MAJOR_HASH_SIZE) { | |
203 | mutex_lock(&block_class_lock); | |
204 | for (dp = major_names[offset]; dp; dp = dp->next) | |
205 | seq_printf(seqf, "%3d %s\n", dp->major, dp->name); | |
206 | mutex_unlock(&block_class_lock); | |
207 | } | |
208 | } | |
209 | #endif /* CONFIG_PROC_FS */ | |
210 | ||
211 | int register_blkdev(unsigned int major, const char *name) | |
212 | { | |
213 | struct blk_major_name **n, *p; | |
214 | int index, ret = 0; | |
215 | ||
216 | mutex_lock(&block_class_lock); | |
217 | ||
218 | /* temporary */ | |
219 | if (major == 0) { | |
220 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { | |
221 | if (major_names[index] == NULL) | |
222 | break; | |
223 | } | |
224 | ||
225 | if (index == 0) { | |
226 | printk("register_blkdev: failed to get major for %s\n", | |
227 | name); | |
228 | ret = -EBUSY; | |
229 | goto out; | |
230 | } | |
231 | major = index; | |
232 | ret = major; | |
233 | } | |
234 | ||
235 | p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); | |
236 | if (p == NULL) { | |
237 | ret = -ENOMEM; | |
238 | goto out; | |
239 | } | |
240 | ||
241 | p->major = major; | |
242 | strlcpy(p->name, name, sizeof(p->name)); | |
243 | p->next = NULL; | |
244 | index = major_to_index(major); | |
245 | ||
246 | for (n = &major_names[index]; *n; n = &(*n)->next) { | |
247 | if ((*n)->major == major) | |
248 | break; | |
249 | } | |
250 | if (!*n) | |
251 | *n = p; | |
252 | else | |
253 | ret = -EBUSY; | |
254 | ||
255 | if (ret < 0) { | |
256 | printk("register_blkdev: cannot get major %d for %s\n", | |
257 | major, name); | |
258 | kfree(p); | |
259 | } | |
260 | out: | |
261 | mutex_unlock(&block_class_lock); | |
262 | return ret; | |
263 | } | |
264 | ||
265 | EXPORT_SYMBOL(register_blkdev); | |
266 | ||
267 | void unregister_blkdev(unsigned int major, const char *name) | |
268 | { | |
269 | struct blk_major_name **n; | |
270 | struct blk_major_name *p = NULL; | |
271 | int index = major_to_index(major); | |
272 | ||
273 | mutex_lock(&block_class_lock); | |
274 | for (n = &major_names[index]; *n; n = &(*n)->next) | |
275 | if ((*n)->major == major) | |
276 | break; | |
277 | if (!*n || strcmp((*n)->name, name)) { | |
278 | WARN_ON(1); | |
279 | } else { | |
280 | p = *n; | |
281 | *n = p->next; | |
282 | } | |
283 | mutex_unlock(&block_class_lock); | |
284 | kfree(p); | |
285 | } | |
286 | ||
287 | EXPORT_SYMBOL(unregister_blkdev); | |
288 | ||
289 | static struct kobj_map *bdev_map; | |
290 | ||
291 | /* | |
292 | * Register device numbers dev..(dev+range-1) | |
293 | * range must be nonzero | |
294 | * The hash chain is sorted on range, so that subranges can override. | |
295 | */ | |
296 | void blk_register_region(dev_t devt, unsigned long range, struct module *module, | |
297 | struct kobject *(*probe)(dev_t, int *, void *), | |
298 | int (*lock)(dev_t, void *), void *data) | |
299 | { | |
300 | kobj_map(bdev_map, devt, range, module, probe, lock, data); | |
301 | } | |
302 | ||
303 | EXPORT_SYMBOL(blk_register_region); | |
304 | ||
305 | void blk_unregister_region(dev_t devt, unsigned long range) | |
306 | { | |
307 | kobj_unmap(bdev_map, devt, range); | |
308 | } | |
309 | ||
310 | EXPORT_SYMBOL(blk_unregister_region); | |
311 | ||
312 | static struct kobject *exact_match(dev_t devt, int *partno, void *data) | |
313 | { | |
314 | struct gendisk *p = data; | |
315 | ||
316 | return &p->dev.kobj; | |
317 | } | |
318 | ||
319 | static int exact_lock(dev_t devt, void *data) | |
320 | { | |
321 | struct gendisk *p = data; | |
322 | ||
323 | if (!get_disk(p)) | |
324 | return -1; | |
325 | return 0; | |
326 | } | |
327 | ||
328 | /** | |
329 | * add_disk - add partitioning information to kernel list | |
330 | * @disk: per-device partitioning information | |
331 | * | |
332 | * This function registers the partitioning information in @disk | |
333 | * with the kernel. | |
334 | */ | |
335 | void add_disk(struct gendisk *disk) | |
336 | { | |
337 | struct backing_dev_info *bdi; | |
338 | int retval; | |
339 | ||
340 | disk->flags |= GENHD_FL_UP; | |
341 | disk->dev.devt = MKDEV(disk->major, disk->first_minor); | |
342 | blk_register_region(disk_devt(disk), disk->minors, NULL, | |
343 | exact_match, exact_lock, disk); | |
344 | register_disk(disk); | |
345 | blk_register_queue(disk); | |
346 | ||
347 | bdi = &disk->queue->backing_dev_info; | |
348 | bdi_register_dev(bdi, disk_devt(disk)); | |
349 | retval = sysfs_create_link(&disk->dev.kobj, &bdi->dev->kobj, "bdi"); | |
350 | WARN_ON(retval); | |
351 | } | |
352 | ||
353 | EXPORT_SYMBOL(add_disk); | |
354 | EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ | |
355 | ||
356 | void unlink_gendisk(struct gendisk *disk) | |
357 | { | |
358 | sysfs_remove_link(&disk->dev.kobj, "bdi"); | |
359 | bdi_unregister(&disk->queue->backing_dev_info); | |
360 | blk_unregister_queue(disk); | |
361 | blk_unregister_region(disk_devt(disk), disk->minors); | |
362 | } | |
363 | ||
364 | /** | |
365 | * get_gendisk - get partitioning information for a given device | |
366 | * @devt: device to get partitioning information for | |
367 | * @part: returned partition index | |
368 | * | |
369 | * This function gets the structure containing partitioning | |
370 | * information for the given device @devt. | |
371 | */ | |
372 | struct gendisk *get_gendisk(dev_t devt, int *partno) | |
373 | { | |
374 | struct kobject *kobj = kobj_lookup(bdev_map, devt, partno); | |
375 | struct device *dev = kobj_to_dev(kobj); | |
376 | ||
377 | return kobj ? dev_to_disk(dev) : NULL; | |
378 | } | |
379 | ||
380 | /** | |
381 | * bdget_disk - do bdget() by gendisk and partition number | |
382 | * @disk: gendisk of interest | |
383 | * @partno: partition number | |
384 | * | |
385 | * Find partition @partno from @disk, do bdget() on it. | |
386 | * | |
387 | * CONTEXT: | |
388 | * Don't care. | |
389 | * | |
390 | * RETURNS: | |
391 | * Resulting block_device on success, NULL on failure. | |
392 | */ | |
393 | extern struct block_device *bdget_disk(struct gendisk *disk, int partno) | |
394 | { | |
395 | dev_t devt = MKDEV(0, 0); | |
396 | ||
397 | if (partno == 0) | |
398 | devt = disk_devt(disk); | |
399 | else { | |
400 | struct hd_struct *part; | |
401 | ||
402 | part = disk_get_part(disk, partno); | |
403 | if (part && part->nr_sects) | |
404 | devt = part_devt(part); | |
405 | disk_put_part(part); | |
406 | } | |
407 | ||
408 | if (likely(devt != MKDEV(0, 0))) | |
409 | return bdget(devt); | |
410 | return NULL; | |
411 | } | |
412 | EXPORT_SYMBOL(bdget_disk); | |
413 | ||
414 | /* | |
415 | * print a full list of all partitions - intended for places where the root | |
416 | * filesystem can't be mounted and thus to give the victim some idea of what | |
417 | * went wrong | |
418 | */ | |
419 | void __init printk_all_partitions(void) | |
420 | { | |
421 | struct class_dev_iter iter; | |
422 | struct device *dev; | |
423 | ||
424 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); | |
425 | while ((dev = class_dev_iter_next(&iter))) { | |
426 | struct gendisk *disk = dev_to_disk(dev); | |
427 | struct disk_part_iter piter; | |
428 | struct hd_struct *part; | |
429 | char buf[BDEVNAME_SIZE]; | |
430 | ||
431 | /* | |
432 | * Don't show empty devices or things that have been | |
433 | * surpressed | |
434 | */ | |
435 | if (get_capacity(disk) == 0 || | |
436 | (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) | |
437 | continue; | |
438 | ||
439 | /* | |
440 | * Note, unlike /proc/partitions, I am showing the | |
441 | * numbers in hex - the same format as the root= | |
442 | * option takes. | |
443 | */ | |
444 | printk("%02x%02x %10llu %s", | |
445 | MAJOR(disk_devt(disk)), MINOR(disk_devt(disk)), | |
446 | (unsigned long long)get_capacity(disk) >> 1, | |
447 | disk_name(disk, 0, buf)); | |
448 | if (disk->driverfs_dev != NULL && | |
449 | disk->driverfs_dev->driver != NULL) | |
450 | printk(" driver: %s\n", | |
451 | disk->driverfs_dev->driver->name); | |
452 | else | |
453 | printk(" (driver?)\n"); | |
454 | ||
455 | /* now show the partitions */ | |
456 | disk_part_iter_init(&piter, disk, 0); | |
457 | while ((part = disk_part_iter_next(&piter))) | |
458 | printk(" %02x%02x %10llu %s\n", | |
459 | MAJOR(part_devt(part)), MINOR(part_devt(part)), | |
460 | (unsigned long long)part->nr_sects >> 1, | |
461 | disk_name(disk, part->partno, buf)); | |
462 | disk_part_iter_exit(&piter); | |
463 | } | |
464 | class_dev_iter_exit(&iter); | |
465 | } | |
466 | ||
467 | #ifdef CONFIG_PROC_FS | |
468 | /* iterator */ | |
469 | static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) | |
470 | { | |
471 | loff_t skip = *pos; | |
472 | struct class_dev_iter *iter; | |
473 | struct device *dev; | |
474 | ||
475 | iter = kmalloc(GFP_KERNEL, sizeof(*iter)); | |
476 | if (!iter) | |
477 | return ERR_PTR(-ENOMEM); | |
478 | ||
479 | seqf->private = iter; | |
480 | class_dev_iter_init(iter, &block_class, NULL, &disk_type); | |
481 | do { | |
482 | dev = class_dev_iter_next(iter); | |
483 | if (!dev) | |
484 | return NULL; | |
485 | } while (skip--); | |
486 | ||
487 | return dev_to_disk(dev); | |
488 | } | |
489 | ||
490 | static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) | |
491 | { | |
492 | struct device *dev; | |
493 | ||
494 | (*pos)++; | |
495 | dev = class_dev_iter_next(seqf->private); | |
496 | if (dev) | |
497 | return dev_to_disk(dev); | |
498 | ||
499 | return NULL; | |
500 | } | |
501 | ||
502 | static void disk_seqf_stop(struct seq_file *seqf, void *v) | |
503 | { | |
504 | struct class_dev_iter *iter = seqf->private; | |
505 | ||
506 | /* stop is called even after start failed :-( */ | |
507 | if (iter) { | |
508 | class_dev_iter_exit(iter); | |
509 | kfree(iter); | |
510 | } | |
511 | } | |
512 | ||
513 | static void *show_partition_start(struct seq_file *seqf, loff_t *pos) | |
514 | { | |
515 | static void *p; | |
516 | ||
517 | p = disk_seqf_start(seqf, pos); | |
518 | if (!IS_ERR(p) && p) | |
519 | seq_puts(seqf, "major minor #blocks name\n\n"); | |
520 | return p; | |
521 | } | |
522 | ||
523 | static int show_partition(struct seq_file *seqf, void *v) | |
524 | { | |
525 | struct gendisk *sgp = v; | |
526 | struct disk_part_iter piter; | |
527 | struct hd_struct *part; | |
528 | char buf[BDEVNAME_SIZE]; | |
529 | ||
530 | /* Don't show non-partitionable removeable devices or empty devices */ | |
531 | if (!get_capacity(sgp) || (!disk_max_parts(sgp) && | |
532 | (sgp->flags & GENHD_FL_REMOVABLE))) | |
533 | return 0; | |
534 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
535 | return 0; | |
536 | ||
537 | /* show the full disk and all non-0 size partitions of it */ | |
538 | seq_printf(seqf, "%4d %4d %10llu %s\n", | |
539 | MAJOR(disk_devt(sgp)), MINOR(disk_devt(sgp)), | |
540 | (unsigned long long)get_capacity(sgp) >> 1, | |
541 | disk_name(sgp, 0, buf)); | |
542 | ||
543 | disk_part_iter_init(&piter, sgp, 0); | |
544 | while ((part = disk_part_iter_next(&piter))) | |
545 | seq_printf(seqf, "%4d %4d %10llu %s\n", | |
546 | MAJOR(part_devt(part)), MINOR(part_devt(part)), | |
547 | (unsigned long long)part->nr_sects >> 1, | |
548 | disk_name(sgp, part->partno, buf)); | |
549 | disk_part_iter_exit(&piter); | |
550 | ||
551 | return 0; | |
552 | } | |
553 | ||
554 | const struct seq_operations partitions_op = { | |
555 | .start = show_partition_start, | |
556 | .next = disk_seqf_next, | |
557 | .stop = disk_seqf_stop, | |
558 | .show = show_partition | |
559 | }; | |
560 | #endif | |
561 | ||
562 | ||
563 | static struct kobject *base_probe(dev_t devt, int *partno, void *data) | |
564 | { | |
565 | if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) | |
566 | /* Make old-style 2.4 aliases work */ | |
567 | request_module("block-major-%d", MAJOR(devt)); | |
568 | return NULL; | |
569 | } | |
570 | ||
571 | static int __init genhd_device_init(void) | |
572 | { | |
573 | int error; | |
574 | ||
575 | block_class.dev_kobj = sysfs_dev_block_kobj; | |
576 | error = class_register(&block_class); | |
577 | if (unlikely(error)) | |
578 | return error; | |
579 | bdev_map = kobj_map_init(base_probe, &block_class_lock); | |
580 | blk_dev_init(); | |
581 | ||
582 | #ifndef CONFIG_SYSFS_DEPRECATED | |
583 | /* create top-level block dir */ | |
584 | block_depr = kobject_create_and_add("block", NULL); | |
585 | #endif | |
586 | return 0; | |
587 | } | |
588 | ||
589 | subsys_initcall(genhd_device_init); | |
590 | ||
591 | static ssize_t disk_range_show(struct device *dev, | |
592 | struct device_attribute *attr, char *buf) | |
593 | { | |
594 | struct gendisk *disk = dev_to_disk(dev); | |
595 | ||
596 | return sprintf(buf, "%d\n", disk->minors); | |
597 | } | |
598 | ||
599 | static ssize_t disk_removable_show(struct device *dev, | |
600 | struct device_attribute *attr, char *buf) | |
601 | { | |
602 | struct gendisk *disk = dev_to_disk(dev); | |
603 | ||
604 | return sprintf(buf, "%d\n", | |
605 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
606 | } | |
607 | ||
608 | static ssize_t disk_ro_show(struct device *dev, | |
609 | struct device_attribute *attr, char *buf) | |
610 | { | |
611 | struct gendisk *disk = dev_to_disk(dev); | |
612 | ||
613 | return sprintf(buf, "%d\n", disk->policy ? 1 : 0); | |
614 | } | |
615 | ||
616 | static ssize_t disk_size_show(struct device *dev, | |
617 | struct device_attribute *attr, char *buf) | |
618 | { | |
619 | struct gendisk *disk = dev_to_disk(dev); | |
620 | ||
621 | return sprintf(buf, "%llu\n", (unsigned long long)get_capacity(disk)); | |
622 | } | |
623 | ||
624 | static ssize_t disk_capability_show(struct device *dev, | |
625 | struct device_attribute *attr, char *buf) | |
626 | { | |
627 | struct gendisk *disk = dev_to_disk(dev); | |
628 | ||
629 | return sprintf(buf, "%x\n", disk->flags); | |
630 | } | |
631 | ||
632 | static ssize_t disk_stat_show(struct device *dev, | |
633 | struct device_attribute *attr, char *buf) | |
634 | { | |
635 | struct gendisk *disk = dev_to_disk(dev); | |
636 | int cpu; | |
637 | ||
638 | cpu = disk_stat_lock(); | |
639 | disk_round_stats(cpu, disk); | |
640 | disk_stat_unlock(); | |
641 | return sprintf(buf, | |
642 | "%8lu %8lu %8llu %8u " | |
643 | "%8lu %8lu %8llu %8u " | |
644 | "%8u %8u %8u" | |
645 | "\n", | |
646 | disk_stat_read(disk, ios[READ]), | |
647 | disk_stat_read(disk, merges[READ]), | |
648 | (unsigned long long)disk_stat_read(disk, sectors[READ]), | |
649 | jiffies_to_msecs(disk_stat_read(disk, ticks[READ])), | |
650 | disk_stat_read(disk, ios[WRITE]), | |
651 | disk_stat_read(disk, merges[WRITE]), | |
652 | (unsigned long long)disk_stat_read(disk, sectors[WRITE]), | |
653 | jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])), | |
654 | disk->in_flight, | |
655 | jiffies_to_msecs(disk_stat_read(disk, io_ticks)), | |
656 | jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); | |
657 | } | |
658 | ||
659 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
660 | static ssize_t disk_fail_show(struct device *dev, | |
661 | struct device_attribute *attr, char *buf) | |
662 | { | |
663 | struct gendisk *disk = dev_to_disk(dev); | |
664 | ||
665 | return sprintf(buf, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0); | |
666 | } | |
667 | ||
668 | static ssize_t disk_fail_store(struct device *dev, | |
669 | struct device_attribute *attr, | |
670 | const char *buf, size_t count) | |
671 | { | |
672 | struct gendisk *disk = dev_to_disk(dev); | |
673 | int i; | |
674 | ||
675 | if (count > 0 && sscanf(buf, "%d", &i) > 0) { | |
676 | if (i == 0) | |
677 | disk->flags &= ~GENHD_FL_FAIL; | |
678 | else | |
679 | disk->flags |= GENHD_FL_FAIL; | |
680 | } | |
681 | ||
682 | return count; | |
683 | } | |
684 | ||
685 | #endif | |
686 | ||
687 | static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); | |
688 | static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); | |
689 | static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); | |
690 | static DEVICE_ATTR(size, S_IRUGO, disk_size_show, NULL); | |
691 | static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); | |
692 | static DEVICE_ATTR(stat, S_IRUGO, disk_stat_show, NULL); | |
693 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
694 | static struct device_attribute dev_attr_fail = | |
695 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, disk_fail_show, disk_fail_store); | |
696 | #endif | |
697 | ||
698 | static struct attribute *disk_attrs[] = { | |
699 | &dev_attr_range.attr, | |
700 | &dev_attr_removable.attr, | |
701 | &dev_attr_ro.attr, | |
702 | &dev_attr_size.attr, | |
703 | &dev_attr_capability.attr, | |
704 | &dev_attr_stat.attr, | |
705 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
706 | &dev_attr_fail.attr, | |
707 | #endif | |
708 | NULL | |
709 | }; | |
710 | ||
711 | static struct attribute_group disk_attr_group = { | |
712 | .attrs = disk_attrs, | |
713 | }; | |
714 | ||
715 | static struct attribute_group *disk_attr_groups[] = { | |
716 | &disk_attr_group, | |
717 | NULL | |
718 | }; | |
719 | ||
720 | static void disk_release(struct device *dev) | |
721 | { | |
722 | struct gendisk *disk = dev_to_disk(dev); | |
723 | ||
724 | kfree(disk->random); | |
725 | kfree(disk->__part); | |
726 | free_disk_stats(disk); | |
727 | kfree(disk); | |
728 | } | |
729 | struct class block_class = { | |
730 | .name = "block", | |
731 | }; | |
732 | ||
733 | static struct device_type disk_type = { | |
734 | .name = "disk", | |
735 | .groups = disk_attr_groups, | |
736 | .release = disk_release, | |
737 | }; | |
738 | ||
739 | #ifdef CONFIG_PROC_FS | |
740 | /* | |
741 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
742 | * entries do, above, but makes them available through one seq_file. | |
743 | * | |
744 | * The output looks suspiciously like /proc/partitions with a bunch of | |
745 | * extra fields. | |
746 | */ | |
747 | static int diskstats_show(struct seq_file *seqf, void *v) | |
748 | { | |
749 | struct gendisk *gp = v; | |
750 | struct disk_part_iter piter; | |
751 | struct hd_struct *hd; | |
752 | char buf[BDEVNAME_SIZE]; | |
753 | int cpu; | |
754 | ||
755 | /* | |
756 | if (&gp->dev.kobj.entry == block_class.devices.next) | |
757 | seq_puts(seqf, "major minor name" | |
758 | " rio rmerge rsect ruse wio wmerge " | |
759 | "wsect wuse running use aveq" | |
760 | "\n\n"); | |
761 | */ | |
762 | ||
763 | cpu = disk_stat_lock(); | |
764 | disk_round_stats(cpu, gp); | |
765 | disk_stat_unlock(); | |
766 | seq_printf(seqf, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n", | |
767 | MAJOR(disk_devt(gp)), MINOR(disk_devt(gp)), | |
768 | disk_name(gp, 0, buf), | |
769 | disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), | |
770 | (unsigned long long)disk_stat_read(gp, sectors[0]), | |
771 | jiffies_to_msecs(disk_stat_read(gp, ticks[0])), | |
772 | disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]), | |
773 | (unsigned long long)disk_stat_read(gp, sectors[1]), | |
774 | jiffies_to_msecs(disk_stat_read(gp, ticks[1])), | |
775 | gp->in_flight, | |
776 | jiffies_to_msecs(disk_stat_read(gp, io_ticks)), | |
777 | jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); | |
778 | ||
779 | /* now show all non-0 size partitions of it */ | |
780 | disk_part_iter_init(&piter, gp, 0); | |
781 | while ((hd = disk_part_iter_next(&piter))) { | |
782 | cpu = disk_stat_lock(); | |
783 | part_round_stats(cpu, hd); | |
784 | disk_stat_unlock(); | |
785 | seq_printf(seqf, "%4d %4d %s %lu %lu %llu " | |
786 | "%u %lu %lu %llu %u %u %u %u\n", | |
787 | MAJOR(part_devt(hd)), MINOR(part_devt(hd)), | |
788 | disk_name(gp, hd->partno, buf), | |
789 | part_stat_read(hd, ios[0]), | |
790 | part_stat_read(hd, merges[0]), | |
791 | (unsigned long long)part_stat_read(hd, sectors[0]), | |
792 | jiffies_to_msecs(part_stat_read(hd, ticks[0])), | |
793 | part_stat_read(hd, ios[1]), | |
794 | part_stat_read(hd, merges[1]), | |
795 | (unsigned long long)part_stat_read(hd, sectors[1]), | |
796 | jiffies_to_msecs(part_stat_read(hd, ticks[1])), | |
797 | hd->in_flight, | |
798 | jiffies_to_msecs(part_stat_read(hd, io_ticks)), | |
799 | jiffies_to_msecs(part_stat_read(hd, time_in_queue)) | |
800 | ); | |
801 | } | |
802 | disk_part_iter_exit(&piter); | |
803 | ||
804 | return 0; | |
805 | } | |
806 | ||
807 | const struct seq_operations diskstats_op = { | |
808 | .start = disk_seqf_start, | |
809 | .next = disk_seqf_next, | |
810 | .stop = disk_seqf_stop, | |
811 | .show = diskstats_show | |
812 | }; | |
813 | #endif /* CONFIG_PROC_FS */ | |
814 | ||
815 | static void media_change_notify_thread(struct work_struct *work) | |
816 | { | |
817 | struct gendisk *gd = container_of(work, struct gendisk, async_notify); | |
818 | char event[] = "MEDIA_CHANGE=1"; | |
819 | char *envp[] = { event, NULL }; | |
820 | ||
821 | /* | |
822 | * set enviroment vars to indicate which event this is for | |
823 | * so that user space will know to go check the media status. | |
824 | */ | |
825 | kobject_uevent_env(&gd->dev.kobj, KOBJ_CHANGE, envp); | |
826 | put_device(gd->driverfs_dev); | |
827 | } | |
828 | ||
829 | #if 0 | |
830 | void genhd_media_change_notify(struct gendisk *disk) | |
831 | { | |
832 | get_device(disk->driverfs_dev); | |
833 | schedule_work(&disk->async_notify); | |
834 | } | |
835 | EXPORT_SYMBOL_GPL(genhd_media_change_notify); | |
836 | #endif /* 0 */ | |
837 | ||
838 | dev_t blk_lookup_devt(const char *name, int partno) | |
839 | { | |
840 | dev_t devt = MKDEV(0, 0); | |
841 | struct class_dev_iter iter; | |
842 | struct device *dev; | |
843 | ||
844 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); | |
845 | while ((dev = class_dev_iter_next(&iter))) { | |
846 | struct gendisk *disk = dev_to_disk(dev); | |
847 | ||
848 | if (strcmp(dev->bus_id, name)) | |
849 | continue; | |
850 | if (partno < 0 || partno > disk_max_parts(disk)) | |
851 | continue; | |
852 | ||
853 | if (partno == 0) | |
854 | devt = disk_devt(disk); | |
855 | else { | |
856 | struct hd_struct *part; | |
857 | ||
858 | part = disk_get_part(disk, partno); | |
859 | if (!part || !part->nr_sects) { | |
860 | disk_put_part(part); | |
861 | continue; | |
862 | } | |
863 | ||
864 | devt = part_devt(part); | |
865 | disk_put_part(part); | |
866 | } | |
867 | break; | |
868 | } | |
869 | class_dev_iter_exit(&iter); | |
870 | return devt; | |
871 | } | |
872 | EXPORT_SYMBOL(blk_lookup_devt); | |
873 | ||
874 | struct gendisk *alloc_disk(int minors) | |
875 | { | |
876 | return alloc_disk_node(minors, -1); | |
877 | } | |
878 | ||
879 | struct gendisk *alloc_disk_node(int minors, int node_id) | |
880 | { | |
881 | struct gendisk *disk; | |
882 | ||
883 | disk = kmalloc_node(sizeof(struct gendisk), | |
884 | GFP_KERNEL | __GFP_ZERO, node_id); | |
885 | if (disk) { | |
886 | if (!init_disk_stats(disk)) { | |
887 | kfree(disk); | |
888 | return NULL; | |
889 | } | |
890 | if (minors > 1) { | |
891 | int size = (minors - 1) * sizeof(struct hd_struct *); | |
892 | disk->__part = kmalloc_node(size, | |
893 | GFP_KERNEL | __GFP_ZERO, node_id); | |
894 | if (!disk->__part) { | |
895 | free_disk_stats(disk); | |
896 | kfree(disk); | |
897 | return NULL; | |
898 | } | |
899 | } | |
900 | disk->minors = minors; | |
901 | rand_initialize_disk(disk); | |
902 | disk->dev.class = &block_class; | |
903 | disk->dev.type = &disk_type; | |
904 | device_initialize(&disk->dev); | |
905 | INIT_WORK(&disk->async_notify, | |
906 | media_change_notify_thread); | |
907 | } | |
908 | return disk; | |
909 | } | |
910 | ||
911 | EXPORT_SYMBOL(alloc_disk); | |
912 | EXPORT_SYMBOL(alloc_disk_node); | |
913 | ||
914 | struct kobject *get_disk(struct gendisk *disk) | |
915 | { | |
916 | struct module *owner; | |
917 | struct kobject *kobj; | |
918 | ||
919 | if (!disk->fops) | |
920 | return NULL; | |
921 | owner = disk->fops->owner; | |
922 | if (owner && !try_module_get(owner)) | |
923 | return NULL; | |
924 | kobj = kobject_get(&disk->dev.kobj); | |
925 | if (kobj == NULL) { | |
926 | module_put(owner); | |
927 | return NULL; | |
928 | } | |
929 | return kobj; | |
930 | ||
931 | } | |
932 | ||
933 | EXPORT_SYMBOL(get_disk); | |
934 | ||
935 | void put_disk(struct gendisk *disk) | |
936 | { | |
937 | if (disk) | |
938 | kobject_put(&disk->dev.kobj); | |
939 | } | |
940 | ||
941 | EXPORT_SYMBOL(put_disk); | |
942 | ||
943 | void set_device_ro(struct block_device *bdev, int flag) | |
944 | { | |
945 | if (bdev->bd_contains != bdev) | |
946 | bdev->bd_part->policy = flag; | |
947 | else | |
948 | bdev->bd_disk->policy = flag; | |
949 | } | |
950 | ||
951 | EXPORT_SYMBOL(set_device_ro); | |
952 | ||
953 | void set_disk_ro(struct gendisk *disk, int flag) | |
954 | { | |
955 | struct disk_part_iter piter; | |
956 | struct hd_struct *part; | |
957 | ||
958 | disk->policy = flag; | |
959 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); | |
960 | while ((part = disk_part_iter_next(&piter))) | |
961 | part->policy = flag; | |
962 | disk_part_iter_exit(&piter); | |
963 | } | |
964 | ||
965 | EXPORT_SYMBOL(set_disk_ro); | |
966 | ||
967 | int bdev_read_only(struct block_device *bdev) | |
968 | { | |
969 | if (!bdev) | |
970 | return 0; | |
971 | else if (bdev->bd_contains != bdev) | |
972 | return bdev->bd_part->policy; | |
973 | else | |
974 | return bdev->bd_disk->policy; | |
975 | } | |
976 | ||
977 | EXPORT_SYMBOL(bdev_read_only); | |
978 | ||
979 | int invalidate_partition(struct gendisk *disk, int partno) | |
980 | { | |
981 | int res = 0; | |
982 | struct block_device *bdev = bdget_disk(disk, partno); | |
983 | if (bdev) { | |
984 | fsync_bdev(bdev); | |
985 | res = __invalidate_device(bdev); | |
986 | bdput(bdev); | |
987 | } | |
988 | return res; | |
989 | } | |
990 | ||
991 | EXPORT_SYMBOL(invalidate_partition); |