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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> |
bcce3de1 | 19 | #include <linux/idr.h> |
1da177e4 | 20 | |
ff88972c AB |
21 | #include "blk.h" |
22 | ||
edfaa7c3 KS |
23 | static DEFINE_MUTEX(block_class_lock); |
24 | #ifndef CONFIG_SYSFS_DEPRECATED | |
25 | struct kobject *block_depr; | |
26 | #endif | |
1da177e4 | 27 | |
bcce3de1 TH |
28 | /* for extended dynamic devt allocation, currently only one major is used */ |
29 | #define MAX_EXT_DEVT (1 << MINORBITS) | |
30 | ||
31 | /* For extended devt allocation. ext_devt_mutex prevents look up | |
32 | * results from going away underneath its user. | |
33 | */ | |
34 | static DEFINE_MUTEX(ext_devt_mutex); | |
35 | static DEFINE_IDR(ext_devt_idr); | |
36 | ||
1826eadf AB |
37 | static struct device_type disk_type; |
38 | ||
e71bf0d0 TH |
39 | /** |
40 | * disk_get_part - get partition | |
41 | * @disk: disk to look partition from | |
42 | * @partno: partition number | |
43 | * | |
44 | * Look for partition @partno from @disk. If found, increment | |
45 | * reference count and return it. | |
46 | * | |
47 | * CONTEXT: | |
48 | * Don't care. | |
49 | * | |
50 | * RETURNS: | |
51 | * Pointer to the found partition on success, NULL if not found. | |
52 | */ | |
53 | struct hd_struct *disk_get_part(struct gendisk *disk, int partno) | |
54 | { | |
55 | struct hd_struct *part; | |
56 | ||
57 | if (unlikely(partno < 1 || partno > disk_max_parts(disk))) | |
58 | return NULL; | |
59 | rcu_read_lock(); | |
60 | part = rcu_dereference(disk->__part[partno - 1]); | |
61 | if (part) | |
62 | get_device(&part->dev); | |
63 | rcu_read_unlock(); | |
64 | ||
65 | return part; | |
66 | } | |
67 | EXPORT_SYMBOL_GPL(disk_get_part); | |
68 | ||
69 | /** | |
70 | * disk_part_iter_init - initialize partition iterator | |
71 | * @piter: iterator to initialize | |
72 | * @disk: disk to iterate over | |
73 | * @flags: DISK_PITER_* flags | |
74 | * | |
75 | * Initialize @piter so that it iterates over partitions of @disk. | |
76 | * | |
77 | * CONTEXT: | |
78 | * Don't care. | |
79 | */ | |
80 | void disk_part_iter_init(struct disk_part_iter *piter, struct gendisk *disk, | |
81 | unsigned int flags) | |
82 | { | |
83 | piter->disk = disk; | |
84 | piter->part = NULL; | |
85 | ||
86 | if (flags & DISK_PITER_REVERSE) | |
87 | piter->idx = disk_max_parts(piter->disk) - 1; | |
88 | else | |
89 | piter->idx = 0; | |
90 | ||
91 | piter->flags = flags; | |
92 | } | |
93 | EXPORT_SYMBOL_GPL(disk_part_iter_init); | |
94 | ||
95 | /** | |
96 | * disk_part_iter_next - proceed iterator to the next partition and return it | |
97 | * @piter: iterator of interest | |
98 | * | |
99 | * Proceed @piter to the next partition and return it. | |
100 | * | |
101 | * CONTEXT: | |
102 | * Don't care. | |
103 | */ | |
104 | struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter) | |
105 | { | |
106 | int inc, end; | |
107 | ||
108 | /* put the last partition */ | |
109 | disk_put_part(piter->part); | |
110 | piter->part = NULL; | |
111 | ||
112 | rcu_read_lock(); | |
113 | ||
114 | /* determine iteration parameters */ | |
115 | if (piter->flags & DISK_PITER_REVERSE) { | |
116 | inc = -1; | |
117 | end = -1; | |
118 | } else { | |
119 | inc = 1; | |
120 | end = disk_max_parts(piter->disk); | |
121 | } | |
122 | ||
123 | /* iterate to the next partition */ | |
124 | for (; piter->idx != end; piter->idx += inc) { | |
125 | struct hd_struct *part; | |
126 | ||
127 | part = rcu_dereference(piter->disk->__part[piter->idx]); | |
128 | if (!part) | |
129 | continue; | |
130 | if (!(piter->flags & DISK_PITER_INCL_EMPTY) && !part->nr_sects) | |
131 | continue; | |
132 | ||
133 | get_device(&part->dev); | |
134 | piter->part = part; | |
135 | piter->idx += inc; | |
136 | break; | |
137 | } | |
138 | ||
139 | rcu_read_unlock(); | |
140 | ||
141 | return piter->part; | |
142 | } | |
143 | EXPORT_SYMBOL_GPL(disk_part_iter_next); | |
144 | ||
145 | /** | |
146 | * disk_part_iter_exit - finish up partition iteration | |
147 | * @piter: iter of interest | |
148 | * | |
149 | * Called when iteration is over. Cleans up @piter. | |
150 | * | |
151 | * CONTEXT: | |
152 | * Don't care. | |
153 | */ | |
154 | void disk_part_iter_exit(struct disk_part_iter *piter) | |
155 | { | |
156 | disk_put_part(piter->part); | |
157 | piter->part = NULL; | |
158 | } | |
159 | EXPORT_SYMBOL_GPL(disk_part_iter_exit); | |
160 | ||
161 | /** | |
162 | * disk_map_sector_rcu - map sector to partition | |
163 | * @disk: gendisk of interest | |
164 | * @sector: sector to map | |
165 | * | |
166 | * Find out which partition @sector maps to on @disk. This is | |
167 | * primarily used for stats accounting. | |
168 | * | |
169 | * CONTEXT: | |
170 | * RCU read locked. The returned partition pointer is valid only | |
171 | * while preemption is disabled. | |
172 | * | |
173 | * RETURNS: | |
174 | * Found partition on success, NULL if there's no matching partition. | |
175 | */ | |
176 | struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) | |
177 | { | |
178 | int i; | |
179 | ||
180 | for (i = 0; i < disk_max_parts(disk); i++) { | |
181 | struct hd_struct *part = rcu_dereference(disk->__part[i]); | |
182 | ||
183 | if (part && part->start_sect <= sector && | |
184 | sector < part->start_sect + part->nr_sects) | |
185 | return part; | |
186 | } | |
187 | return NULL; | |
188 | } | |
189 | EXPORT_SYMBOL_GPL(disk_map_sector_rcu); | |
190 | ||
1da177e4 LT |
191 | /* |
192 | * Can be deleted altogether. Later. | |
193 | * | |
194 | */ | |
195 | static struct blk_major_name { | |
196 | struct blk_major_name *next; | |
197 | int major; | |
198 | char name[16]; | |
68eef3b4 | 199 | } *major_names[BLKDEV_MAJOR_HASH_SIZE]; |
1da177e4 LT |
200 | |
201 | /* index in the above - for now: assume no multimajor ranges */ | |
202 | static inline int major_to_index(int major) | |
203 | { | |
68eef3b4 | 204 | return major % BLKDEV_MAJOR_HASH_SIZE; |
7170be5f NH |
205 | } |
206 | ||
68eef3b4 | 207 | #ifdef CONFIG_PROC_FS |
cf771cb5 | 208 | void blkdev_show(struct seq_file *seqf, off_t offset) |
7170be5f | 209 | { |
68eef3b4 | 210 | struct blk_major_name *dp; |
7170be5f | 211 | |
68eef3b4 | 212 | if (offset < BLKDEV_MAJOR_HASH_SIZE) { |
edfaa7c3 | 213 | mutex_lock(&block_class_lock); |
68eef3b4 | 214 | for (dp = major_names[offset]; dp; dp = dp->next) |
cf771cb5 | 215 | seq_printf(seqf, "%3d %s\n", dp->major, dp->name); |
edfaa7c3 | 216 | mutex_unlock(&block_class_lock); |
1da177e4 | 217 | } |
1da177e4 | 218 | } |
68eef3b4 | 219 | #endif /* CONFIG_PROC_FS */ |
1da177e4 LT |
220 | |
221 | int register_blkdev(unsigned int major, const char *name) | |
222 | { | |
223 | struct blk_major_name **n, *p; | |
224 | int index, ret = 0; | |
225 | ||
edfaa7c3 | 226 | mutex_lock(&block_class_lock); |
1da177e4 LT |
227 | |
228 | /* temporary */ | |
229 | if (major == 0) { | |
230 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { | |
231 | if (major_names[index] == NULL) | |
232 | break; | |
233 | } | |
234 | ||
235 | if (index == 0) { | |
236 | printk("register_blkdev: failed to get major for %s\n", | |
237 | name); | |
238 | ret = -EBUSY; | |
239 | goto out; | |
240 | } | |
241 | major = index; | |
242 | ret = major; | |
243 | } | |
244 | ||
245 | p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); | |
246 | if (p == NULL) { | |
247 | ret = -ENOMEM; | |
248 | goto out; | |
249 | } | |
250 | ||
251 | p->major = major; | |
252 | strlcpy(p->name, name, sizeof(p->name)); | |
253 | p->next = NULL; | |
254 | index = major_to_index(major); | |
255 | ||
256 | for (n = &major_names[index]; *n; n = &(*n)->next) { | |
257 | if ((*n)->major == major) | |
258 | break; | |
259 | } | |
260 | if (!*n) | |
261 | *n = p; | |
262 | else | |
263 | ret = -EBUSY; | |
264 | ||
265 | if (ret < 0) { | |
266 | printk("register_blkdev: cannot get major %d for %s\n", | |
267 | major, name); | |
268 | kfree(p); | |
269 | } | |
270 | out: | |
edfaa7c3 | 271 | mutex_unlock(&block_class_lock); |
1da177e4 LT |
272 | return ret; |
273 | } | |
274 | ||
275 | EXPORT_SYMBOL(register_blkdev); | |
276 | ||
f4480240 | 277 | void unregister_blkdev(unsigned int major, const char *name) |
1da177e4 LT |
278 | { |
279 | struct blk_major_name **n; | |
280 | struct blk_major_name *p = NULL; | |
281 | int index = major_to_index(major); | |
1da177e4 | 282 | |
edfaa7c3 | 283 | mutex_lock(&block_class_lock); |
1da177e4 LT |
284 | for (n = &major_names[index]; *n; n = &(*n)->next) |
285 | if ((*n)->major == major) | |
286 | break; | |
294462a5 AM |
287 | if (!*n || strcmp((*n)->name, name)) { |
288 | WARN_ON(1); | |
294462a5 | 289 | } else { |
1da177e4 LT |
290 | p = *n; |
291 | *n = p->next; | |
292 | } | |
edfaa7c3 | 293 | mutex_unlock(&block_class_lock); |
1da177e4 | 294 | kfree(p); |
1da177e4 LT |
295 | } |
296 | ||
297 | EXPORT_SYMBOL(unregister_blkdev); | |
298 | ||
299 | static struct kobj_map *bdev_map; | |
300 | ||
bcce3de1 TH |
301 | /** |
302 | * blk_alloc_devt - allocate a dev_t for a partition | |
303 | * @part: partition to allocate dev_t for | |
304 | * @gfp_mask: memory allocation flag | |
305 | * @devt: out parameter for resulting dev_t | |
306 | * | |
307 | * Allocate a dev_t for block device. | |
308 | * | |
309 | * RETURNS: | |
310 | * 0 on success, allocated dev_t is returned in *@devt. -errno on | |
311 | * failure. | |
312 | * | |
313 | * CONTEXT: | |
314 | * Might sleep. | |
315 | */ | |
316 | int blk_alloc_devt(struct hd_struct *part, dev_t *devt) | |
317 | { | |
318 | struct gendisk *disk = part_to_disk(part); | |
319 | int idx, rc; | |
320 | ||
321 | /* in consecutive minor range? */ | |
322 | if (part->partno < disk->minors) { | |
323 | *devt = MKDEV(disk->major, disk->first_minor + part->partno); | |
324 | return 0; | |
325 | } | |
326 | ||
327 | /* allocate ext devt */ | |
328 | do { | |
329 | if (!idr_pre_get(&ext_devt_idr, GFP_KERNEL)) | |
330 | return -ENOMEM; | |
331 | rc = idr_get_new(&ext_devt_idr, part, &idx); | |
332 | } while (rc == -EAGAIN); | |
333 | ||
334 | if (rc) | |
335 | return rc; | |
336 | ||
337 | if (idx > MAX_EXT_DEVT) { | |
338 | idr_remove(&ext_devt_idr, idx); | |
339 | return -EBUSY; | |
340 | } | |
341 | ||
342 | *devt = MKDEV(BLOCK_EXT_MAJOR, idx); | |
343 | return 0; | |
344 | } | |
345 | ||
346 | /** | |
347 | * blk_free_devt - free a dev_t | |
348 | * @devt: dev_t to free | |
349 | * | |
350 | * Free @devt which was allocated using blk_alloc_devt(). | |
351 | * | |
352 | * CONTEXT: | |
353 | * Might sleep. | |
354 | */ | |
355 | void blk_free_devt(dev_t devt) | |
356 | { | |
357 | might_sleep(); | |
358 | ||
359 | if (devt == MKDEV(0, 0)) | |
360 | return; | |
361 | ||
362 | if (MAJOR(devt) == BLOCK_EXT_MAJOR) { | |
363 | mutex_lock(&ext_devt_mutex); | |
364 | idr_remove(&ext_devt_idr, MINOR(devt)); | |
365 | mutex_unlock(&ext_devt_mutex); | |
366 | } | |
367 | } | |
368 | ||
1da177e4 LT |
369 | /* |
370 | * Register device numbers dev..(dev+range-1) | |
371 | * range must be nonzero | |
372 | * The hash chain is sorted on range, so that subranges can override. | |
373 | */ | |
edfaa7c3 | 374 | void blk_register_region(dev_t devt, unsigned long range, struct module *module, |
1da177e4 LT |
375 | struct kobject *(*probe)(dev_t, int *, void *), |
376 | int (*lock)(dev_t, void *), void *data) | |
377 | { | |
edfaa7c3 | 378 | kobj_map(bdev_map, devt, range, module, probe, lock, data); |
1da177e4 LT |
379 | } |
380 | ||
381 | EXPORT_SYMBOL(blk_register_region); | |
382 | ||
edfaa7c3 | 383 | void blk_unregister_region(dev_t devt, unsigned long range) |
1da177e4 | 384 | { |
edfaa7c3 | 385 | kobj_unmap(bdev_map, devt, range); |
1da177e4 LT |
386 | } |
387 | ||
388 | EXPORT_SYMBOL(blk_unregister_region); | |
389 | ||
cf771cb5 | 390 | static struct kobject *exact_match(dev_t devt, int *partno, void *data) |
1da177e4 LT |
391 | { |
392 | struct gendisk *p = data; | |
edfaa7c3 KS |
393 | |
394 | return &p->dev.kobj; | |
1da177e4 LT |
395 | } |
396 | ||
edfaa7c3 | 397 | static int exact_lock(dev_t devt, void *data) |
1da177e4 LT |
398 | { |
399 | struct gendisk *p = data; | |
400 | ||
401 | if (!get_disk(p)) | |
402 | return -1; | |
403 | return 0; | |
404 | } | |
405 | ||
406 | /** | |
407 | * add_disk - add partitioning information to kernel list | |
408 | * @disk: per-device partitioning information | |
409 | * | |
410 | * This function registers the partitioning information in @disk | |
411 | * with the kernel. | |
412 | */ | |
413 | void add_disk(struct gendisk *disk) | |
414 | { | |
cf0ca9fe | 415 | struct backing_dev_info *bdi; |
6ffeea77 | 416 | int retval; |
cf0ca9fe | 417 | |
1da177e4 | 418 | disk->flags |= GENHD_FL_UP; |
f331c029 TH |
419 | disk->dev.devt = MKDEV(disk->major, disk->first_minor); |
420 | blk_register_region(disk_devt(disk), disk->minors, NULL, | |
421 | exact_match, exact_lock, disk); | |
1da177e4 LT |
422 | register_disk(disk); |
423 | blk_register_queue(disk); | |
cf0ca9fe PZ |
424 | |
425 | bdi = &disk->queue->backing_dev_info; | |
f331c029 | 426 | bdi_register_dev(bdi, disk_devt(disk)); |
6ffeea77 GKH |
427 | retval = sysfs_create_link(&disk->dev.kobj, &bdi->dev->kobj, "bdi"); |
428 | WARN_ON(retval); | |
1da177e4 LT |
429 | } |
430 | ||
431 | EXPORT_SYMBOL(add_disk); | |
432 | EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ | |
433 | ||
434 | void unlink_gendisk(struct gendisk *disk) | |
435 | { | |
cf0ca9fe PZ |
436 | sysfs_remove_link(&disk->dev.kobj, "bdi"); |
437 | bdi_unregister(&disk->queue->backing_dev_info); | |
1da177e4 | 438 | blk_unregister_queue(disk); |
f331c029 | 439 | blk_unregister_region(disk_devt(disk), disk->minors); |
1da177e4 LT |
440 | } |
441 | ||
1da177e4 LT |
442 | /** |
443 | * get_gendisk - get partitioning information for a given device | |
710027a4 RD |
444 | * @devt: device to get partitioning information for |
445 | * @part: returned partition index | |
1da177e4 LT |
446 | * |
447 | * This function gets the structure containing partitioning | |
710027a4 | 448 | * information for the given device @devt. |
1da177e4 | 449 | */ |
cf771cb5 | 450 | struct gendisk *get_gendisk(dev_t devt, int *partno) |
1da177e4 | 451 | { |
bcce3de1 TH |
452 | struct gendisk *disk = NULL; |
453 | ||
454 | if (MAJOR(devt) != BLOCK_EXT_MAJOR) { | |
455 | struct kobject *kobj; | |
456 | ||
457 | kobj = kobj_lookup(bdev_map, devt, partno); | |
458 | if (kobj) | |
459 | disk = dev_to_disk(kobj_to_dev(kobj)); | |
460 | } else { | |
461 | struct hd_struct *part; | |
462 | ||
463 | mutex_lock(&ext_devt_mutex); | |
464 | part = idr_find(&ext_devt_idr, MINOR(devt)); | |
465 | if (part && get_disk(part_to_disk(part))) { | |
466 | *partno = part->partno; | |
467 | disk = part_to_disk(part); | |
468 | } | |
469 | mutex_unlock(&ext_devt_mutex); | |
470 | } | |
edfaa7c3 | 471 | |
bcce3de1 | 472 | return disk; |
1da177e4 LT |
473 | } |
474 | ||
f331c029 TH |
475 | /** |
476 | * bdget_disk - do bdget() by gendisk and partition number | |
477 | * @disk: gendisk of interest | |
478 | * @partno: partition number | |
479 | * | |
480 | * Find partition @partno from @disk, do bdget() on it. | |
481 | * | |
482 | * CONTEXT: | |
483 | * Don't care. | |
484 | * | |
485 | * RETURNS: | |
486 | * Resulting block_device on success, NULL on failure. | |
487 | */ | |
488 | extern struct block_device *bdget_disk(struct gendisk *disk, int partno) | |
489 | { | |
490 | dev_t devt = MKDEV(0, 0); | |
491 | ||
492 | if (partno == 0) | |
493 | devt = disk_devt(disk); | |
494 | else { | |
e71bf0d0 | 495 | struct hd_struct *part; |
f331c029 | 496 | |
e71bf0d0 | 497 | part = disk_get_part(disk, partno); |
f331c029 TH |
498 | if (part && part->nr_sects) |
499 | devt = part_devt(part); | |
e71bf0d0 | 500 | disk_put_part(part); |
f331c029 TH |
501 | } |
502 | ||
503 | if (likely(devt != MKDEV(0, 0))) | |
504 | return bdget(devt); | |
505 | return NULL; | |
506 | } | |
507 | EXPORT_SYMBOL(bdget_disk); | |
508 | ||
5c6f35c5 GKH |
509 | /* |
510 | * print a full list of all partitions - intended for places where the root | |
511 | * filesystem can't be mounted and thus to give the victim some idea of what | |
512 | * went wrong | |
513 | */ | |
514 | void __init printk_all_partitions(void) | |
515 | { | |
def4e38d TH |
516 | struct class_dev_iter iter; |
517 | struct device *dev; | |
518 | ||
519 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); | |
520 | while ((dev = class_dev_iter_next(&iter))) { | |
521 | struct gendisk *disk = dev_to_disk(dev); | |
e71bf0d0 TH |
522 | struct disk_part_iter piter; |
523 | struct hd_struct *part; | |
def4e38d | 524 | char buf[BDEVNAME_SIZE]; |
def4e38d TH |
525 | |
526 | /* | |
527 | * Don't show empty devices or things that have been | |
528 | * surpressed | |
529 | */ | |
530 | if (get_capacity(disk) == 0 || | |
531 | (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) | |
532 | continue; | |
533 | ||
534 | /* | |
535 | * Note, unlike /proc/partitions, I am showing the | |
536 | * numbers in hex - the same format as the root= | |
537 | * option takes. | |
538 | */ | |
539 | printk("%02x%02x %10llu %s", | |
f331c029 | 540 | MAJOR(disk_devt(disk)), MINOR(disk_devt(disk)), |
def4e38d TH |
541 | (unsigned long long)get_capacity(disk) >> 1, |
542 | disk_name(disk, 0, buf)); | |
543 | if (disk->driverfs_dev != NULL && | |
544 | disk->driverfs_dev->driver != NULL) | |
545 | printk(" driver: %s\n", | |
546 | disk->driverfs_dev->driver->name); | |
547 | else | |
548 | printk(" (driver?)\n"); | |
549 | ||
550 | /* now show the partitions */ | |
e71bf0d0 TH |
551 | disk_part_iter_init(&piter, disk, 0); |
552 | while ((part = disk_part_iter_next(&piter))) | |
def4e38d | 553 | printk(" %02x%02x %10llu %s\n", |
f331c029 TH |
554 | MAJOR(part_devt(part)), MINOR(part_devt(part)), |
555 | (unsigned long long)part->nr_sects >> 1, | |
556 | disk_name(disk, part->partno, buf)); | |
e71bf0d0 | 557 | disk_part_iter_exit(&piter); |
def4e38d TH |
558 | } |
559 | class_dev_iter_exit(&iter); | |
dd2a345f DG |
560 | } |
561 | ||
1da177e4 LT |
562 | #ifdef CONFIG_PROC_FS |
563 | /* iterator */ | |
def4e38d | 564 | static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
68c4d4a7 | 565 | { |
def4e38d TH |
566 | loff_t skip = *pos; |
567 | struct class_dev_iter *iter; | |
568 | struct device *dev; | |
68c4d4a7 | 569 | |
def4e38d TH |
570 | iter = kmalloc(GFP_KERNEL, sizeof(*iter)); |
571 | if (!iter) | |
572 | return ERR_PTR(-ENOMEM); | |
573 | ||
574 | seqf->private = iter; | |
575 | class_dev_iter_init(iter, &block_class, NULL, &disk_type); | |
576 | do { | |
577 | dev = class_dev_iter_next(iter); | |
578 | if (!dev) | |
579 | return NULL; | |
580 | } while (skip--); | |
581 | ||
582 | return dev_to_disk(dev); | |
68c4d4a7 GKH |
583 | } |
584 | ||
def4e38d | 585 | static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
1da177e4 | 586 | { |
edfaa7c3 | 587 | struct device *dev; |
1da177e4 | 588 | |
def4e38d TH |
589 | (*pos)++; |
590 | dev = class_dev_iter_next(seqf->private); | |
2ac3cee5 | 591 | if (dev) |
68c4d4a7 | 592 | return dev_to_disk(dev); |
2ac3cee5 | 593 | |
1da177e4 LT |
594 | return NULL; |
595 | } | |
596 | ||
def4e38d | 597 | static void disk_seqf_stop(struct seq_file *seqf, void *v) |
27f30251 | 598 | { |
def4e38d | 599 | struct class_dev_iter *iter = seqf->private; |
27f30251 | 600 | |
def4e38d TH |
601 | /* stop is called even after start failed :-( */ |
602 | if (iter) { | |
603 | class_dev_iter_exit(iter); | |
604 | kfree(iter); | |
5c0ef6d0 | 605 | } |
1da177e4 LT |
606 | } |
607 | ||
def4e38d | 608 | static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
1da177e4 | 609 | { |
def4e38d TH |
610 | static void *p; |
611 | ||
612 | p = disk_seqf_start(seqf, pos); | |
613 | if (!IS_ERR(p) && p) | |
614 | seq_puts(seqf, "major minor #blocks name\n\n"); | |
615 | return p; | |
1da177e4 LT |
616 | } |
617 | ||
cf771cb5 | 618 | static int show_partition(struct seq_file *seqf, void *v) |
1da177e4 LT |
619 | { |
620 | struct gendisk *sgp = v; | |
e71bf0d0 TH |
621 | struct disk_part_iter piter; |
622 | struct hd_struct *part; | |
1da177e4 LT |
623 | char buf[BDEVNAME_SIZE]; |
624 | ||
1da177e4 | 625 | /* Don't show non-partitionable removeable devices or empty devices */ |
f331c029 TH |
626 | if (!get_capacity(sgp) || (!disk_max_parts(sgp) && |
627 | (sgp->flags & GENHD_FL_REMOVABLE))) | |
1da177e4 LT |
628 | return 0; |
629 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
630 | return 0; | |
631 | ||
632 | /* show the full disk and all non-0 size partitions of it */ | |
cf771cb5 | 633 | seq_printf(seqf, "%4d %4d %10llu %s\n", |
f331c029 | 634 | MAJOR(disk_devt(sgp)), MINOR(disk_devt(sgp)), |
1da177e4 LT |
635 | (unsigned long long)get_capacity(sgp) >> 1, |
636 | disk_name(sgp, 0, buf)); | |
e71bf0d0 TH |
637 | |
638 | disk_part_iter_init(&piter, sgp, 0); | |
639 | while ((part = disk_part_iter_next(&piter))) | |
cf771cb5 | 640 | seq_printf(seqf, "%4d %4d %10llu %s\n", |
f331c029 TH |
641 | MAJOR(part_devt(part)), MINOR(part_devt(part)), |
642 | (unsigned long long)part->nr_sects >> 1, | |
643 | disk_name(sgp, part->partno, buf)); | |
e71bf0d0 | 644 | disk_part_iter_exit(&piter); |
1da177e4 LT |
645 | |
646 | return 0; | |
647 | } | |
648 | ||
12f32bb3 | 649 | const struct seq_operations partitions_op = { |
def4e38d TH |
650 | .start = show_partition_start, |
651 | .next = disk_seqf_next, | |
652 | .stop = disk_seqf_stop, | |
edfaa7c3 | 653 | .show = show_partition |
1da177e4 LT |
654 | }; |
655 | #endif | |
656 | ||
657 | ||
cf771cb5 | 658 | static struct kobject *base_probe(dev_t devt, int *partno, void *data) |
1da177e4 | 659 | { |
edfaa7c3 | 660 | if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
1da177e4 | 661 | /* Make old-style 2.4 aliases work */ |
edfaa7c3 | 662 | request_module("block-major-%d", MAJOR(devt)); |
1da177e4 LT |
663 | return NULL; |
664 | } | |
665 | ||
666 | static int __init genhd_device_init(void) | |
667 | { | |
e105b8bf DW |
668 | int error; |
669 | ||
670 | block_class.dev_kobj = sysfs_dev_block_kobj; | |
671 | error = class_register(&block_class); | |
ee27a558 RM |
672 | if (unlikely(error)) |
673 | return error; | |
edfaa7c3 | 674 | bdev_map = kobj_map_init(base_probe, &block_class_lock); |
1da177e4 | 675 | blk_dev_init(); |
edfaa7c3 KS |
676 | |
677 | #ifndef CONFIG_SYSFS_DEPRECATED | |
678 | /* create top-level block dir */ | |
679 | block_depr = kobject_create_and_add("block", NULL); | |
680 | #endif | |
830d3cfb | 681 | return 0; |
1da177e4 LT |
682 | } |
683 | ||
684 | subsys_initcall(genhd_device_init); | |
685 | ||
edfaa7c3 KS |
686 | static ssize_t disk_range_show(struct device *dev, |
687 | struct device_attribute *attr, char *buf) | |
1da177e4 | 688 | { |
edfaa7c3 | 689 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 690 | |
edfaa7c3 | 691 | return sprintf(buf, "%d\n", disk->minors); |
1da177e4 LT |
692 | } |
693 | ||
edfaa7c3 KS |
694 | static ssize_t disk_removable_show(struct device *dev, |
695 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 696 | { |
edfaa7c3 | 697 | struct gendisk *disk = dev_to_disk(dev); |
a7fd6706 | 698 | |
edfaa7c3 KS |
699 | return sprintf(buf, "%d\n", |
700 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
a7fd6706 KS |
701 | } |
702 | ||
1c9ce527 KS |
703 | static ssize_t disk_ro_show(struct device *dev, |
704 | struct device_attribute *attr, char *buf) | |
705 | { | |
706 | struct gendisk *disk = dev_to_disk(dev); | |
707 | ||
708 | return sprintf(buf, "%d\n", disk->policy ? 1 : 0); | |
709 | } | |
710 | ||
edfaa7c3 KS |
711 | static ssize_t disk_size_show(struct device *dev, |
712 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 713 | { |
edfaa7c3 | 714 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 715 | |
edfaa7c3 | 716 | return sprintf(buf, "%llu\n", (unsigned long long)get_capacity(disk)); |
1da177e4 | 717 | } |
edfaa7c3 KS |
718 | |
719 | static ssize_t disk_capability_show(struct device *dev, | |
720 | struct device_attribute *attr, char *buf) | |
86ce18d7 | 721 | { |
edfaa7c3 KS |
722 | struct gendisk *disk = dev_to_disk(dev); |
723 | ||
724 | return sprintf(buf, "%x\n", disk->flags); | |
86ce18d7 | 725 | } |
edfaa7c3 KS |
726 | |
727 | static ssize_t disk_stat_show(struct device *dev, | |
728 | struct device_attribute *attr, char *buf) | |
1da177e4 | 729 | { |
edfaa7c3 | 730 | struct gendisk *disk = dev_to_disk(dev); |
c9959059 | 731 | int cpu; |
edfaa7c3 | 732 | |
c9959059 TH |
733 | cpu = disk_stat_lock(); |
734 | disk_round_stats(cpu, disk); | |
735 | disk_stat_unlock(); | |
edfaa7c3 | 736 | return sprintf(buf, |
837c7878 BW |
737 | "%8lu %8lu %8llu %8u " |
738 | "%8lu %8lu %8llu %8u " | |
1da177e4 LT |
739 | "%8u %8u %8u" |
740 | "\n", | |
47a00410 JA |
741 | disk_stat_read(disk, ios[READ]), |
742 | disk_stat_read(disk, merges[READ]), | |
743 | (unsigned long long)disk_stat_read(disk, sectors[READ]), | |
744 | jiffies_to_msecs(disk_stat_read(disk, ticks[READ])), | |
745 | disk_stat_read(disk, ios[WRITE]), | |
746 | disk_stat_read(disk, merges[WRITE]), | |
747 | (unsigned long long)disk_stat_read(disk, sectors[WRITE]), | |
748 | jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])), | |
1da177e4 LT |
749 | disk->in_flight, |
750 | jiffies_to_msecs(disk_stat_read(disk, io_ticks)), | |
751 | jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); | |
752 | } | |
1da177e4 | 753 | |
c17bb495 | 754 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
755 | static ssize_t disk_fail_show(struct device *dev, |
756 | struct device_attribute *attr, char *buf) | |
757 | { | |
758 | struct gendisk *disk = dev_to_disk(dev); | |
759 | ||
760 | return sprintf(buf, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0); | |
761 | } | |
c17bb495 | 762 | |
edfaa7c3 KS |
763 | static ssize_t disk_fail_store(struct device *dev, |
764 | struct device_attribute *attr, | |
c17bb495 AM |
765 | const char *buf, size_t count) |
766 | { | |
edfaa7c3 | 767 | struct gendisk *disk = dev_to_disk(dev); |
c17bb495 AM |
768 | int i; |
769 | ||
770 | if (count > 0 && sscanf(buf, "%d", &i) > 0) { | |
771 | if (i == 0) | |
772 | disk->flags &= ~GENHD_FL_FAIL; | |
773 | else | |
774 | disk->flags |= GENHD_FL_FAIL; | |
775 | } | |
776 | ||
777 | return count; | |
778 | } | |
c17bb495 AM |
779 | |
780 | #endif | |
781 | ||
edfaa7c3 KS |
782 | static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); |
783 | static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); | |
1c9ce527 | 784 | static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); |
edfaa7c3 KS |
785 | static DEVICE_ATTR(size, S_IRUGO, disk_size_show, NULL); |
786 | static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); | |
787 | static DEVICE_ATTR(stat, S_IRUGO, disk_stat_show, NULL); | |
c17bb495 | 788 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
789 | static struct device_attribute dev_attr_fail = |
790 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, disk_fail_show, disk_fail_store); | |
c17bb495 | 791 | #endif |
edfaa7c3 KS |
792 | |
793 | static struct attribute *disk_attrs[] = { | |
794 | &dev_attr_range.attr, | |
795 | &dev_attr_removable.attr, | |
1c9ce527 | 796 | &dev_attr_ro.attr, |
edfaa7c3 KS |
797 | &dev_attr_size.attr, |
798 | &dev_attr_capability.attr, | |
799 | &dev_attr_stat.attr, | |
800 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
801 | &dev_attr_fail.attr, | |
802 | #endif | |
803 | NULL | |
804 | }; | |
805 | ||
806 | static struct attribute_group disk_attr_group = { | |
807 | .attrs = disk_attrs, | |
808 | }; | |
809 | ||
810 | static struct attribute_group *disk_attr_groups[] = { | |
811 | &disk_attr_group, | |
812 | NULL | |
1da177e4 LT |
813 | }; |
814 | ||
edfaa7c3 | 815 | static void disk_release(struct device *dev) |
1da177e4 | 816 | { |
edfaa7c3 KS |
817 | struct gendisk *disk = dev_to_disk(dev); |
818 | ||
1da177e4 | 819 | kfree(disk->random); |
e71bf0d0 | 820 | kfree(disk->__part); |
1da177e4 LT |
821 | free_disk_stats(disk); |
822 | kfree(disk); | |
823 | } | |
edfaa7c3 KS |
824 | struct class block_class = { |
825 | .name = "block", | |
1da177e4 LT |
826 | }; |
827 | ||
1826eadf | 828 | static struct device_type disk_type = { |
edfaa7c3 KS |
829 | .name = "disk", |
830 | .groups = disk_attr_groups, | |
831 | .release = disk_release, | |
1da177e4 LT |
832 | }; |
833 | ||
a6e2ba88 | 834 | #ifdef CONFIG_PROC_FS |
cf771cb5 TH |
835 | /* |
836 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
837 | * entries do, above, but makes them available through one seq_file. | |
838 | * | |
839 | * The output looks suspiciously like /proc/partitions with a bunch of | |
840 | * extra fields. | |
841 | */ | |
842 | static int diskstats_show(struct seq_file *seqf, void *v) | |
1da177e4 LT |
843 | { |
844 | struct gendisk *gp = v; | |
e71bf0d0 TH |
845 | struct disk_part_iter piter; |
846 | struct hd_struct *hd; | |
1da177e4 | 847 | char buf[BDEVNAME_SIZE]; |
c9959059 | 848 | int cpu; |
1da177e4 LT |
849 | |
850 | /* | |
edfaa7c3 | 851 | if (&gp->dev.kobj.entry == block_class.devices.next) |
cf771cb5 | 852 | seq_puts(seqf, "major minor name" |
1da177e4 LT |
853 | " rio rmerge rsect ruse wio wmerge " |
854 | "wsect wuse running use aveq" | |
855 | "\n\n"); | |
856 | */ | |
857 | ||
c9959059 TH |
858 | cpu = disk_stat_lock(); |
859 | disk_round_stats(cpu, gp); | |
860 | disk_stat_unlock(); | |
cf771cb5 | 861 | seq_printf(seqf, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n", |
f331c029 TH |
862 | MAJOR(disk_devt(gp)), MINOR(disk_devt(gp)), |
863 | disk_name(gp, 0, buf), | |
a362357b JA |
864 | disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), |
865 | (unsigned long long)disk_stat_read(gp, sectors[0]), | |
866 | jiffies_to_msecs(disk_stat_read(gp, ticks[0])), | |
867 | disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]), | |
868 | (unsigned long long)disk_stat_read(gp, sectors[1]), | |
869 | jiffies_to_msecs(disk_stat_read(gp, ticks[1])), | |
1da177e4 LT |
870 | gp->in_flight, |
871 | jiffies_to_msecs(disk_stat_read(gp, io_ticks)), | |
872 | jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); | |
873 | ||
874 | /* now show all non-0 size partitions of it */ | |
e71bf0d0 TH |
875 | disk_part_iter_init(&piter, gp, 0); |
876 | while ((hd = disk_part_iter_next(&piter))) { | |
c9959059 TH |
877 | cpu = disk_stat_lock(); |
878 | part_round_stats(cpu, hd); | |
879 | disk_stat_unlock(); | |
cf771cb5 | 880 | seq_printf(seqf, "%4d %4d %s %lu %lu %llu " |
28f39d55 | 881 | "%u %lu %lu %llu %u %u %u %u\n", |
f331c029 TH |
882 | MAJOR(part_devt(hd)), MINOR(part_devt(hd)), |
883 | disk_name(gp, hd->partno, buf), | |
28f39d55 JM |
884 | part_stat_read(hd, ios[0]), |
885 | part_stat_read(hd, merges[0]), | |
886 | (unsigned long long)part_stat_read(hd, sectors[0]), | |
887 | jiffies_to_msecs(part_stat_read(hd, ticks[0])), | |
888 | part_stat_read(hd, ios[1]), | |
889 | part_stat_read(hd, merges[1]), | |
890 | (unsigned long long)part_stat_read(hd, sectors[1]), | |
891 | jiffies_to_msecs(part_stat_read(hd, ticks[1])), | |
892 | hd->in_flight, | |
893 | jiffies_to_msecs(part_stat_read(hd, io_ticks)), | |
894 | jiffies_to_msecs(part_stat_read(hd, time_in_queue)) | |
895 | ); | |
1da177e4 | 896 | } |
e71bf0d0 | 897 | disk_part_iter_exit(&piter); |
1da177e4 LT |
898 | |
899 | return 0; | |
900 | } | |
901 | ||
12f32bb3 | 902 | const struct seq_operations diskstats_op = { |
def4e38d TH |
903 | .start = disk_seqf_start, |
904 | .next = disk_seqf_next, | |
905 | .stop = disk_seqf_stop, | |
1da177e4 LT |
906 | .show = diskstats_show |
907 | }; | |
a6e2ba88 | 908 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 909 | |
8ce7ad7b KCA |
910 | static void media_change_notify_thread(struct work_struct *work) |
911 | { | |
912 | struct gendisk *gd = container_of(work, struct gendisk, async_notify); | |
913 | char event[] = "MEDIA_CHANGE=1"; | |
914 | char *envp[] = { event, NULL }; | |
915 | ||
916 | /* | |
917 | * set enviroment vars to indicate which event this is for | |
918 | * so that user space will know to go check the media status. | |
919 | */ | |
edfaa7c3 | 920 | kobject_uevent_env(&gd->dev.kobj, KOBJ_CHANGE, envp); |
8ce7ad7b KCA |
921 | put_device(gd->driverfs_dev); |
922 | } | |
923 | ||
1826eadf | 924 | #if 0 |
8ce7ad7b KCA |
925 | void genhd_media_change_notify(struct gendisk *disk) |
926 | { | |
927 | get_device(disk->driverfs_dev); | |
928 | schedule_work(&disk->async_notify); | |
929 | } | |
930 | EXPORT_SYMBOL_GPL(genhd_media_change_notify); | |
1826eadf | 931 | #endif /* 0 */ |
8ce7ad7b | 932 | |
cf771cb5 | 933 | dev_t blk_lookup_devt(const char *name, int partno) |
a142be85 | 934 | { |
def4e38d TH |
935 | dev_t devt = MKDEV(0, 0); |
936 | struct class_dev_iter iter; | |
937 | struct device *dev; | |
a142be85 | 938 | |
def4e38d TH |
939 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); |
940 | while ((dev = class_dev_iter_next(&iter))) { | |
a142be85 | 941 | struct gendisk *disk = dev_to_disk(dev); |
a142be85 | 942 | |
f331c029 TH |
943 | if (strcmp(dev->bus_id, name)) |
944 | continue; | |
945 | if (partno < 0 || partno > disk_max_parts(disk)) | |
946 | continue; | |
947 | ||
948 | if (partno == 0) | |
949 | devt = disk_devt(disk); | |
950 | else { | |
e71bf0d0 | 951 | struct hd_struct *part; |
f331c029 | 952 | |
e71bf0d0 TH |
953 | part = disk_get_part(disk, partno); |
954 | if (!part || !part->nr_sects) { | |
955 | disk_put_part(part); | |
f331c029 | 956 | continue; |
e71bf0d0 | 957 | } |
f331c029 TH |
958 | |
959 | devt = part_devt(part); | |
e71bf0d0 | 960 | disk_put_part(part); |
def4e38d | 961 | } |
f331c029 | 962 | break; |
5c0ef6d0 | 963 | } |
def4e38d | 964 | class_dev_iter_exit(&iter); |
edfaa7c3 KS |
965 | return devt; |
966 | } | |
edfaa7c3 KS |
967 | EXPORT_SYMBOL(blk_lookup_devt); |
968 | ||
1da177e4 LT |
969 | struct gendisk *alloc_disk(int minors) |
970 | { | |
1946089a CL |
971 | return alloc_disk_node(minors, -1); |
972 | } | |
973 | ||
974 | struct gendisk *alloc_disk_node(int minors, int node_id) | |
bcce3de1 TH |
975 | { |
976 | return alloc_disk_ext_node(minors, 0, node_id); | |
977 | } | |
978 | ||
979 | struct gendisk *alloc_disk_ext(int minors, int ext_minors) | |
980 | { | |
981 | return alloc_disk_ext_node(minors, ext_minors, -1); | |
982 | } | |
983 | ||
984 | struct gendisk *alloc_disk_ext_node(int minors, int ext_minors, int node_id) | |
1946089a CL |
985 | { |
986 | struct gendisk *disk; | |
987 | ||
94f6030c CL |
988 | disk = kmalloc_node(sizeof(struct gendisk), |
989 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 990 | if (disk) { |
bcce3de1 TH |
991 | int tot_minors = minors + ext_minors; |
992 | ||
1da177e4 LT |
993 | if (!init_disk_stats(disk)) { |
994 | kfree(disk); | |
995 | return NULL; | |
996 | } | |
bcce3de1 TH |
997 | if (tot_minors > 1) { |
998 | int size = (tot_minors - 1) * sizeof(struct hd_struct *); | |
e71bf0d0 | 999 | disk->__part = kmalloc_node(size, |
94f6030c | 1000 | GFP_KERNEL | __GFP_ZERO, node_id); |
e71bf0d0 | 1001 | if (!disk->__part) { |
c7674030 | 1002 | free_disk_stats(disk); |
1da177e4 LT |
1003 | kfree(disk); |
1004 | return NULL; | |
1005 | } | |
1da177e4 LT |
1006 | } |
1007 | disk->minors = minors; | |
bcce3de1 | 1008 | disk->ext_minors = ext_minors; |
1da177e4 | 1009 | rand_initialize_disk(disk); |
edfaa7c3 KS |
1010 | disk->dev.class = &block_class; |
1011 | disk->dev.type = &disk_type; | |
1012 | device_initialize(&disk->dev); | |
8ce7ad7b KCA |
1013 | INIT_WORK(&disk->async_notify, |
1014 | media_change_notify_thread); | |
1da177e4 LT |
1015 | } |
1016 | return disk; | |
1017 | } | |
1018 | ||
1019 | EXPORT_SYMBOL(alloc_disk); | |
1946089a | 1020 | EXPORT_SYMBOL(alloc_disk_node); |
bcce3de1 TH |
1021 | EXPORT_SYMBOL(alloc_disk_ext); |
1022 | EXPORT_SYMBOL(alloc_disk_ext_node); | |
1da177e4 LT |
1023 | |
1024 | struct kobject *get_disk(struct gendisk *disk) | |
1025 | { | |
1026 | struct module *owner; | |
1027 | struct kobject *kobj; | |
1028 | ||
1029 | if (!disk->fops) | |
1030 | return NULL; | |
1031 | owner = disk->fops->owner; | |
1032 | if (owner && !try_module_get(owner)) | |
1033 | return NULL; | |
edfaa7c3 | 1034 | kobj = kobject_get(&disk->dev.kobj); |
1da177e4 LT |
1035 | if (kobj == NULL) { |
1036 | module_put(owner); | |
1037 | return NULL; | |
1038 | } | |
1039 | return kobj; | |
1040 | ||
1041 | } | |
1042 | ||
1043 | EXPORT_SYMBOL(get_disk); | |
1044 | ||
1045 | void put_disk(struct gendisk *disk) | |
1046 | { | |
1047 | if (disk) | |
edfaa7c3 | 1048 | kobject_put(&disk->dev.kobj); |
1da177e4 LT |
1049 | } |
1050 | ||
1051 | EXPORT_SYMBOL(put_disk); | |
1052 | ||
1053 | void set_device_ro(struct block_device *bdev, int flag) | |
1054 | { | |
1055 | if (bdev->bd_contains != bdev) | |
1056 | bdev->bd_part->policy = flag; | |
1057 | else | |
1058 | bdev->bd_disk->policy = flag; | |
1059 | } | |
1060 | ||
1061 | EXPORT_SYMBOL(set_device_ro); | |
1062 | ||
1063 | void set_disk_ro(struct gendisk *disk, int flag) | |
1064 | { | |
e71bf0d0 TH |
1065 | struct disk_part_iter piter; |
1066 | struct hd_struct *part; | |
1067 | ||
1da177e4 | 1068 | disk->policy = flag; |
e71bf0d0 TH |
1069 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); |
1070 | while ((part = disk_part_iter_next(&piter))) | |
1071 | part->policy = flag; | |
1072 | disk_part_iter_exit(&piter); | |
1da177e4 LT |
1073 | } |
1074 | ||
1075 | EXPORT_SYMBOL(set_disk_ro); | |
1076 | ||
1077 | int bdev_read_only(struct block_device *bdev) | |
1078 | { | |
1079 | if (!bdev) | |
1080 | return 0; | |
1081 | else if (bdev->bd_contains != bdev) | |
1082 | return bdev->bd_part->policy; | |
1083 | else | |
1084 | return bdev->bd_disk->policy; | |
1085 | } | |
1086 | ||
1087 | EXPORT_SYMBOL(bdev_read_only); | |
1088 | ||
cf771cb5 | 1089 | int invalidate_partition(struct gendisk *disk, int partno) |
1da177e4 LT |
1090 | { |
1091 | int res = 0; | |
cf771cb5 | 1092 | struct block_device *bdev = bdget_disk(disk, partno); |
1da177e4 | 1093 | if (bdev) { |
2ef41634 CH |
1094 | fsync_bdev(bdev); |
1095 | res = __invalidate_device(bdev); | |
1da177e4 LT |
1096 | bdput(bdev); |
1097 | } | |
1098 | return res; | |
1099 | } | |
1100 | ||
1101 | EXPORT_SYMBOL(invalidate_partition); |