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 | { | |
540eed56 TH |
55 | struct hd_struct *part = NULL; |
56 | struct disk_part_tbl *ptbl; | |
e71bf0d0 | 57 | |
540eed56 | 58 | if (unlikely(partno < 0)) |
e71bf0d0 | 59 | return NULL; |
540eed56 | 60 | |
e71bf0d0 | 61 | rcu_read_lock(); |
540eed56 TH |
62 | |
63 | ptbl = rcu_dereference(disk->part_tbl); | |
64 | if (likely(partno < ptbl->len)) { | |
65 | part = rcu_dereference(ptbl->part[partno]); | |
66 | if (part) | |
67 | get_device(part_to_dev(part)); | |
68 | } | |
69 | ||
e71bf0d0 TH |
70 | rcu_read_unlock(); |
71 | ||
72 | return part; | |
73 | } | |
74 | EXPORT_SYMBOL_GPL(disk_get_part); | |
75 | ||
76 | /** | |
77 | * disk_part_iter_init - initialize partition iterator | |
78 | * @piter: iterator to initialize | |
79 | * @disk: disk to iterate over | |
80 | * @flags: DISK_PITER_* flags | |
81 | * | |
82 | * Initialize @piter so that it iterates over partitions of @disk. | |
83 | * | |
84 | * CONTEXT: | |
85 | * Don't care. | |
86 | */ | |
87 | void disk_part_iter_init(struct disk_part_iter *piter, struct gendisk *disk, | |
88 | unsigned int flags) | |
89 | { | |
540eed56 TH |
90 | struct disk_part_tbl *ptbl; |
91 | ||
92 | rcu_read_lock(); | |
93 | ptbl = rcu_dereference(disk->part_tbl); | |
94 | ||
e71bf0d0 TH |
95 | piter->disk = disk; |
96 | piter->part = NULL; | |
97 | ||
98 | if (flags & DISK_PITER_REVERSE) | |
540eed56 | 99 | piter->idx = ptbl->len - 1; |
b5d0b9df | 100 | else if (flags & DISK_PITER_INCL_PART0) |
e71bf0d0 | 101 | piter->idx = 0; |
b5d0b9df TH |
102 | else |
103 | piter->idx = 1; | |
e71bf0d0 TH |
104 | |
105 | piter->flags = flags; | |
540eed56 TH |
106 | |
107 | rcu_read_unlock(); | |
e71bf0d0 TH |
108 | } |
109 | EXPORT_SYMBOL_GPL(disk_part_iter_init); | |
110 | ||
111 | /** | |
112 | * disk_part_iter_next - proceed iterator to the next partition and return it | |
113 | * @piter: iterator of interest | |
114 | * | |
115 | * Proceed @piter to the next partition and return it. | |
116 | * | |
117 | * CONTEXT: | |
118 | * Don't care. | |
119 | */ | |
120 | struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter) | |
121 | { | |
540eed56 | 122 | struct disk_part_tbl *ptbl; |
e71bf0d0 TH |
123 | int inc, end; |
124 | ||
125 | /* put the last partition */ | |
126 | disk_put_part(piter->part); | |
127 | piter->part = NULL; | |
128 | ||
540eed56 | 129 | /* get part_tbl */ |
e71bf0d0 | 130 | rcu_read_lock(); |
540eed56 | 131 | ptbl = rcu_dereference(piter->disk->part_tbl); |
e71bf0d0 TH |
132 | |
133 | /* determine iteration parameters */ | |
134 | if (piter->flags & DISK_PITER_REVERSE) { | |
135 | inc = -1; | |
b5d0b9df TH |
136 | if (piter->flags & DISK_PITER_INCL_PART0) |
137 | end = -1; | |
138 | else | |
139 | end = 0; | |
e71bf0d0 TH |
140 | } else { |
141 | inc = 1; | |
540eed56 | 142 | end = ptbl->len; |
e71bf0d0 TH |
143 | } |
144 | ||
145 | /* iterate to the next partition */ | |
146 | for (; piter->idx != end; piter->idx += inc) { | |
147 | struct hd_struct *part; | |
148 | ||
540eed56 | 149 | part = rcu_dereference(ptbl->part[piter->idx]); |
e71bf0d0 TH |
150 | if (!part) |
151 | continue; | |
152 | if (!(piter->flags & DISK_PITER_INCL_EMPTY) && !part->nr_sects) | |
153 | continue; | |
154 | ||
ed9e1982 | 155 | get_device(part_to_dev(part)); |
e71bf0d0 TH |
156 | piter->part = part; |
157 | piter->idx += inc; | |
158 | break; | |
159 | } | |
160 | ||
161 | rcu_read_unlock(); | |
162 | ||
163 | return piter->part; | |
164 | } | |
165 | EXPORT_SYMBOL_GPL(disk_part_iter_next); | |
166 | ||
167 | /** | |
168 | * disk_part_iter_exit - finish up partition iteration | |
169 | * @piter: iter of interest | |
170 | * | |
171 | * Called when iteration is over. Cleans up @piter. | |
172 | * | |
173 | * CONTEXT: | |
174 | * Don't care. | |
175 | */ | |
176 | void disk_part_iter_exit(struct disk_part_iter *piter) | |
177 | { | |
178 | disk_put_part(piter->part); | |
179 | piter->part = NULL; | |
180 | } | |
181 | EXPORT_SYMBOL_GPL(disk_part_iter_exit); | |
182 | ||
183 | /** | |
184 | * disk_map_sector_rcu - map sector to partition | |
185 | * @disk: gendisk of interest | |
186 | * @sector: sector to map | |
187 | * | |
188 | * Find out which partition @sector maps to on @disk. This is | |
189 | * primarily used for stats accounting. | |
190 | * | |
191 | * CONTEXT: | |
192 | * RCU read locked. The returned partition pointer is valid only | |
193 | * while preemption is disabled. | |
194 | * | |
195 | * RETURNS: | |
074a7aca | 196 | * Found partition on success, part0 is returned if no partition matches |
e71bf0d0 TH |
197 | */ |
198 | struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) | |
199 | { | |
540eed56 | 200 | struct disk_part_tbl *ptbl; |
e71bf0d0 TH |
201 | int i; |
202 | ||
540eed56 TH |
203 | ptbl = rcu_dereference(disk->part_tbl); |
204 | ||
205 | for (i = 1; i < ptbl->len; i++) { | |
206 | struct hd_struct *part = rcu_dereference(ptbl->part[i]); | |
e71bf0d0 TH |
207 | |
208 | if (part && part->start_sect <= sector && | |
209 | sector < part->start_sect + part->nr_sects) | |
210 | return part; | |
211 | } | |
074a7aca | 212 | return &disk->part0; |
e71bf0d0 TH |
213 | } |
214 | EXPORT_SYMBOL_GPL(disk_map_sector_rcu); | |
215 | ||
1da177e4 LT |
216 | /* |
217 | * Can be deleted altogether. Later. | |
218 | * | |
219 | */ | |
220 | static struct blk_major_name { | |
221 | struct blk_major_name *next; | |
222 | int major; | |
223 | char name[16]; | |
68eef3b4 | 224 | } *major_names[BLKDEV_MAJOR_HASH_SIZE]; |
1da177e4 LT |
225 | |
226 | /* index in the above - for now: assume no multimajor ranges */ | |
227 | static inline int major_to_index(int major) | |
228 | { | |
68eef3b4 | 229 | return major % BLKDEV_MAJOR_HASH_SIZE; |
7170be5f NH |
230 | } |
231 | ||
68eef3b4 | 232 | #ifdef CONFIG_PROC_FS |
cf771cb5 | 233 | void blkdev_show(struct seq_file *seqf, off_t offset) |
7170be5f | 234 | { |
68eef3b4 | 235 | struct blk_major_name *dp; |
7170be5f | 236 | |
68eef3b4 | 237 | if (offset < BLKDEV_MAJOR_HASH_SIZE) { |
edfaa7c3 | 238 | mutex_lock(&block_class_lock); |
68eef3b4 | 239 | for (dp = major_names[offset]; dp; dp = dp->next) |
cf771cb5 | 240 | seq_printf(seqf, "%3d %s\n", dp->major, dp->name); |
edfaa7c3 | 241 | mutex_unlock(&block_class_lock); |
1da177e4 | 242 | } |
1da177e4 | 243 | } |
68eef3b4 | 244 | #endif /* CONFIG_PROC_FS */ |
1da177e4 LT |
245 | |
246 | int register_blkdev(unsigned int major, const char *name) | |
247 | { | |
248 | struct blk_major_name **n, *p; | |
249 | int index, ret = 0; | |
250 | ||
edfaa7c3 | 251 | mutex_lock(&block_class_lock); |
1da177e4 LT |
252 | |
253 | /* temporary */ | |
254 | if (major == 0) { | |
255 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { | |
256 | if (major_names[index] == NULL) | |
257 | break; | |
258 | } | |
259 | ||
260 | if (index == 0) { | |
261 | printk("register_blkdev: failed to get major for %s\n", | |
262 | name); | |
263 | ret = -EBUSY; | |
264 | goto out; | |
265 | } | |
266 | major = index; | |
267 | ret = major; | |
268 | } | |
269 | ||
270 | p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); | |
271 | if (p == NULL) { | |
272 | ret = -ENOMEM; | |
273 | goto out; | |
274 | } | |
275 | ||
276 | p->major = major; | |
277 | strlcpy(p->name, name, sizeof(p->name)); | |
278 | p->next = NULL; | |
279 | index = major_to_index(major); | |
280 | ||
281 | for (n = &major_names[index]; *n; n = &(*n)->next) { | |
282 | if ((*n)->major == major) | |
283 | break; | |
284 | } | |
285 | if (!*n) | |
286 | *n = p; | |
287 | else | |
288 | ret = -EBUSY; | |
289 | ||
290 | if (ret < 0) { | |
291 | printk("register_blkdev: cannot get major %d for %s\n", | |
292 | major, name); | |
293 | kfree(p); | |
294 | } | |
295 | out: | |
edfaa7c3 | 296 | mutex_unlock(&block_class_lock); |
1da177e4 LT |
297 | return ret; |
298 | } | |
299 | ||
300 | EXPORT_SYMBOL(register_blkdev); | |
301 | ||
f4480240 | 302 | void unregister_blkdev(unsigned int major, const char *name) |
1da177e4 LT |
303 | { |
304 | struct blk_major_name **n; | |
305 | struct blk_major_name *p = NULL; | |
306 | int index = major_to_index(major); | |
1da177e4 | 307 | |
edfaa7c3 | 308 | mutex_lock(&block_class_lock); |
1da177e4 LT |
309 | for (n = &major_names[index]; *n; n = &(*n)->next) |
310 | if ((*n)->major == major) | |
311 | break; | |
294462a5 AM |
312 | if (!*n || strcmp((*n)->name, name)) { |
313 | WARN_ON(1); | |
294462a5 | 314 | } else { |
1da177e4 LT |
315 | p = *n; |
316 | *n = p->next; | |
317 | } | |
edfaa7c3 | 318 | mutex_unlock(&block_class_lock); |
1da177e4 | 319 | kfree(p); |
1da177e4 LT |
320 | } |
321 | ||
322 | EXPORT_SYMBOL(unregister_blkdev); | |
323 | ||
324 | static struct kobj_map *bdev_map; | |
325 | ||
870d6656 TH |
326 | /** |
327 | * blk_mangle_minor - scatter minor numbers apart | |
328 | * @minor: minor number to mangle | |
329 | * | |
330 | * Scatter consecutively allocated @minor number apart if MANGLE_DEVT | |
331 | * is enabled. Mangling twice gives the original value. | |
332 | * | |
333 | * RETURNS: | |
334 | * Mangled value. | |
335 | * | |
336 | * CONTEXT: | |
337 | * Don't care. | |
338 | */ | |
339 | static int blk_mangle_minor(int minor) | |
340 | { | |
341 | #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT | |
342 | int i; | |
343 | ||
344 | for (i = 0; i < MINORBITS / 2; i++) { | |
345 | int low = minor & (1 << i); | |
346 | int high = minor & (1 << (MINORBITS - 1 - i)); | |
347 | int distance = MINORBITS - 1 - 2 * i; | |
348 | ||
349 | minor ^= low | high; /* clear both bits */ | |
350 | low <<= distance; /* swap the positions */ | |
351 | high >>= distance; | |
352 | minor |= low | high; /* and set */ | |
353 | } | |
354 | #endif | |
355 | return minor; | |
356 | } | |
357 | ||
bcce3de1 TH |
358 | /** |
359 | * blk_alloc_devt - allocate a dev_t for a partition | |
360 | * @part: partition to allocate dev_t for | |
bcce3de1 TH |
361 | * @devt: out parameter for resulting dev_t |
362 | * | |
363 | * Allocate a dev_t for block device. | |
364 | * | |
365 | * RETURNS: | |
366 | * 0 on success, allocated dev_t is returned in *@devt. -errno on | |
367 | * failure. | |
368 | * | |
369 | * CONTEXT: | |
370 | * Might sleep. | |
371 | */ | |
372 | int blk_alloc_devt(struct hd_struct *part, dev_t *devt) | |
373 | { | |
374 | struct gendisk *disk = part_to_disk(part); | |
375 | int idx, rc; | |
376 | ||
377 | /* in consecutive minor range? */ | |
378 | if (part->partno < disk->minors) { | |
379 | *devt = MKDEV(disk->major, disk->first_minor + part->partno); | |
380 | return 0; | |
381 | } | |
382 | ||
383 | /* allocate ext devt */ | |
384 | do { | |
385 | if (!idr_pre_get(&ext_devt_idr, GFP_KERNEL)) | |
386 | return -ENOMEM; | |
387 | rc = idr_get_new(&ext_devt_idr, part, &idx); | |
388 | } while (rc == -EAGAIN); | |
389 | ||
390 | if (rc) | |
391 | return rc; | |
392 | ||
393 | if (idx > MAX_EXT_DEVT) { | |
394 | idr_remove(&ext_devt_idr, idx); | |
395 | return -EBUSY; | |
396 | } | |
397 | ||
870d6656 | 398 | *devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx)); |
bcce3de1 TH |
399 | return 0; |
400 | } | |
401 | ||
402 | /** | |
403 | * blk_free_devt - free a dev_t | |
404 | * @devt: dev_t to free | |
405 | * | |
406 | * Free @devt which was allocated using blk_alloc_devt(). | |
407 | * | |
408 | * CONTEXT: | |
409 | * Might sleep. | |
410 | */ | |
411 | void blk_free_devt(dev_t devt) | |
412 | { | |
413 | might_sleep(); | |
414 | ||
415 | if (devt == MKDEV(0, 0)) | |
416 | return; | |
417 | ||
418 | if (MAJOR(devt) == BLOCK_EXT_MAJOR) { | |
419 | mutex_lock(&ext_devt_mutex); | |
870d6656 | 420 | idr_remove(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
bcce3de1 TH |
421 | mutex_unlock(&ext_devt_mutex); |
422 | } | |
423 | } | |
424 | ||
1f014290 TH |
425 | static char *bdevt_str(dev_t devt, char *buf) |
426 | { | |
427 | if (MAJOR(devt) <= 0xff && MINOR(devt) <= 0xff) { | |
428 | char tbuf[BDEVT_SIZE]; | |
429 | snprintf(tbuf, BDEVT_SIZE, "%02x%02x", MAJOR(devt), MINOR(devt)); | |
430 | snprintf(buf, BDEVT_SIZE, "%-9s", tbuf); | |
431 | } else | |
432 | snprintf(buf, BDEVT_SIZE, "%03x:%05x", MAJOR(devt), MINOR(devt)); | |
433 | ||
434 | return buf; | |
435 | } | |
436 | ||
1da177e4 LT |
437 | /* |
438 | * Register device numbers dev..(dev+range-1) | |
439 | * range must be nonzero | |
440 | * The hash chain is sorted on range, so that subranges can override. | |
441 | */ | |
edfaa7c3 | 442 | void blk_register_region(dev_t devt, unsigned long range, struct module *module, |
1da177e4 LT |
443 | struct kobject *(*probe)(dev_t, int *, void *), |
444 | int (*lock)(dev_t, void *), void *data) | |
445 | { | |
edfaa7c3 | 446 | kobj_map(bdev_map, devt, range, module, probe, lock, data); |
1da177e4 LT |
447 | } |
448 | ||
449 | EXPORT_SYMBOL(blk_register_region); | |
450 | ||
edfaa7c3 | 451 | void blk_unregister_region(dev_t devt, unsigned long range) |
1da177e4 | 452 | { |
edfaa7c3 | 453 | kobj_unmap(bdev_map, devt, range); |
1da177e4 LT |
454 | } |
455 | ||
456 | EXPORT_SYMBOL(blk_unregister_region); | |
457 | ||
cf771cb5 | 458 | static struct kobject *exact_match(dev_t devt, int *partno, void *data) |
1da177e4 LT |
459 | { |
460 | struct gendisk *p = data; | |
edfaa7c3 | 461 | |
ed9e1982 | 462 | return &disk_to_dev(p)->kobj; |
1da177e4 LT |
463 | } |
464 | ||
edfaa7c3 | 465 | static int exact_lock(dev_t devt, void *data) |
1da177e4 LT |
466 | { |
467 | struct gendisk *p = data; | |
468 | ||
469 | if (!get_disk(p)) | |
470 | return -1; | |
471 | return 0; | |
472 | } | |
473 | ||
474 | /** | |
475 | * add_disk - add partitioning information to kernel list | |
476 | * @disk: per-device partitioning information | |
477 | * | |
478 | * This function registers the partitioning information in @disk | |
479 | * with the kernel. | |
3e1a7ff8 TH |
480 | * |
481 | * FIXME: error handling | |
1da177e4 LT |
482 | */ |
483 | void add_disk(struct gendisk *disk) | |
484 | { | |
cf0ca9fe | 485 | struct backing_dev_info *bdi; |
3e1a7ff8 | 486 | dev_t devt; |
6ffeea77 | 487 | int retval; |
cf0ca9fe | 488 | |
3e1a7ff8 TH |
489 | /* minors == 0 indicates to use ext devt from part0 and should |
490 | * be accompanied with EXT_DEVT flag. Make sure all | |
491 | * parameters make sense. | |
492 | */ | |
493 | WARN_ON(disk->minors && !(disk->major || disk->first_minor)); | |
494 | WARN_ON(!disk->minors && !(disk->flags & GENHD_FL_EXT_DEVT)); | |
495 | ||
1da177e4 | 496 | disk->flags |= GENHD_FL_UP; |
3e1a7ff8 TH |
497 | |
498 | retval = blk_alloc_devt(&disk->part0, &devt); | |
499 | if (retval) { | |
500 | WARN_ON(1); | |
501 | return; | |
502 | } | |
503 | disk_to_dev(disk)->devt = devt; | |
504 | ||
505 | /* ->major and ->first_minor aren't supposed to be | |
506 | * dereferenced from here on, but set them just in case. | |
507 | */ | |
508 | disk->major = MAJOR(devt); | |
509 | disk->first_minor = MINOR(devt); | |
510 | ||
f331c029 TH |
511 | blk_register_region(disk_devt(disk), disk->minors, NULL, |
512 | exact_match, exact_lock, disk); | |
1da177e4 LT |
513 | register_disk(disk); |
514 | blk_register_queue(disk); | |
cf0ca9fe PZ |
515 | |
516 | bdi = &disk->queue->backing_dev_info; | |
f331c029 | 517 | bdi_register_dev(bdi, disk_devt(disk)); |
ed9e1982 TH |
518 | retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj, |
519 | "bdi"); | |
6ffeea77 | 520 | WARN_ON(retval); |
1da177e4 LT |
521 | } |
522 | ||
523 | EXPORT_SYMBOL(add_disk); | |
524 | EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ | |
525 | ||
526 | void unlink_gendisk(struct gendisk *disk) | |
527 | { | |
ed9e1982 | 528 | sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); |
cf0ca9fe | 529 | bdi_unregister(&disk->queue->backing_dev_info); |
1da177e4 | 530 | blk_unregister_queue(disk); |
f331c029 | 531 | blk_unregister_region(disk_devt(disk), disk->minors); |
1da177e4 LT |
532 | } |
533 | ||
1da177e4 LT |
534 | /** |
535 | * get_gendisk - get partitioning information for a given device | |
710027a4 | 536 | * @devt: device to get partitioning information for |
496aa8a9 | 537 | * @partno: returned partition index |
1da177e4 LT |
538 | * |
539 | * This function gets the structure containing partitioning | |
710027a4 | 540 | * information for the given device @devt. |
1da177e4 | 541 | */ |
cf771cb5 | 542 | struct gendisk *get_gendisk(dev_t devt, int *partno) |
1da177e4 | 543 | { |
bcce3de1 TH |
544 | struct gendisk *disk = NULL; |
545 | ||
546 | if (MAJOR(devt) != BLOCK_EXT_MAJOR) { | |
547 | struct kobject *kobj; | |
548 | ||
549 | kobj = kobj_lookup(bdev_map, devt, partno); | |
550 | if (kobj) | |
551 | disk = dev_to_disk(kobj_to_dev(kobj)); | |
552 | } else { | |
553 | struct hd_struct *part; | |
554 | ||
555 | mutex_lock(&ext_devt_mutex); | |
870d6656 | 556 | part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
bcce3de1 TH |
557 | if (part && get_disk(part_to_disk(part))) { |
558 | *partno = part->partno; | |
559 | disk = part_to_disk(part); | |
560 | } | |
561 | mutex_unlock(&ext_devt_mutex); | |
562 | } | |
edfaa7c3 | 563 | |
bcce3de1 | 564 | return disk; |
1da177e4 LT |
565 | } |
566 | ||
f331c029 TH |
567 | /** |
568 | * bdget_disk - do bdget() by gendisk and partition number | |
569 | * @disk: gendisk of interest | |
570 | * @partno: partition number | |
571 | * | |
572 | * Find partition @partno from @disk, do bdget() on it. | |
573 | * | |
574 | * CONTEXT: | |
575 | * Don't care. | |
576 | * | |
577 | * RETURNS: | |
578 | * Resulting block_device on success, NULL on failure. | |
579 | */ | |
aeb3d3a8 | 580 | struct block_device *bdget_disk(struct gendisk *disk, int partno) |
f331c029 | 581 | { |
548b10eb TH |
582 | struct hd_struct *part; |
583 | struct block_device *bdev = NULL; | |
f331c029 | 584 | |
548b10eb | 585 | part = disk_get_part(disk, partno); |
2bbedcb4 | 586 | if (part) |
548b10eb TH |
587 | bdev = bdget(part_devt(part)); |
588 | disk_put_part(part); | |
f331c029 | 589 | |
548b10eb | 590 | return bdev; |
f331c029 TH |
591 | } |
592 | EXPORT_SYMBOL(bdget_disk); | |
593 | ||
5c6f35c5 GKH |
594 | /* |
595 | * print a full list of all partitions - intended for places where the root | |
596 | * filesystem can't be mounted and thus to give the victim some idea of what | |
597 | * went wrong | |
598 | */ | |
599 | void __init printk_all_partitions(void) | |
600 | { | |
def4e38d TH |
601 | struct class_dev_iter iter; |
602 | struct device *dev; | |
603 | ||
604 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); | |
605 | while ((dev = class_dev_iter_next(&iter))) { | |
606 | struct gendisk *disk = dev_to_disk(dev); | |
e71bf0d0 TH |
607 | struct disk_part_iter piter; |
608 | struct hd_struct *part; | |
1f014290 TH |
609 | char name_buf[BDEVNAME_SIZE]; |
610 | char devt_buf[BDEVT_SIZE]; | |
def4e38d TH |
611 | |
612 | /* | |
613 | * Don't show empty devices or things that have been | |
614 | * surpressed | |
615 | */ | |
616 | if (get_capacity(disk) == 0 || | |
617 | (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) | |
618 | continue; | |
619 | ||
620 | /* | |
621 | * Note, unlike /proc/partitions, I am showing the | |
622 | * numbers in hex - the same format as the root= | |
623 | * option takes. | |
624 | */ | |
074a7aca TH |
625 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); |
626 | while ((part = disk_part_iter_next(&piter))) { | |
627 | bool is_part0 = part == &disk->part0; | |
def4e38d | 628 | |
074a7aca | 629 | printk("%s%s %10llu %s", is_part0 ? "" : " ", |
1f014290 | 630 | bdevt_str(part_devt(part), devt_buf), |
f331c029 | 631 | (unsigned long long)part->nr_sects >> 1, |
1f014290 | 632 | disk_name(disk, part->partno, name_buf)); |
074a7aca TH |
633 | if (is_part0) { |
634 | if (disk->driverfs_dev != NULL && | |
635 | disk->driverfs_dev->driver != NULL) | |
636 | printk(" driver: %s\n", | |
637 | disk->driverfs_dev->driver->name); | |
638 | else | |
639 | printk(" (driver?)\n"); | |
640 | } else | |
641 | printk("\n"); | |
642 | } | |
e71bf0d0 | 643 | disk_part_iter_exit(&piter); |
def4e38d TH |
644 | } |
645 | class_dev_iter_exit(&iter); | |
dd2a345f DG |
646 | } |
647 | ||
1da177e4 LT |
648 | #ifdef CONFIG_PROC_FS |
649 | /* iterator */ | |
def4e38d | 650 | static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
68c4d4a7 | 651 | { |
def4e38d TH |
652 | loff_t skip = *pos; |
653 | struct class_dev_iter *iter; | |
654 | struct device *dev; | |
68c4d4a7 | 655 | |
aeb3d3a8 | 656 | iter = kmalloc(sizeof(*iter), GFP_KERNEL); |
def4e38d TH |
657 | if (!iter) |
658 | return ERR_PTR(-ENOMEM); | |
659 | ||
660 | seqf->private = iter; | |
661 | class_dev_iter_init(iter, &block_class, NULL, &disk_type); | |
662 | do { | |
663 | dev = class_dev_iter_next(iter); | |
664 | if (!dev) | |
665 | return NULL; | |
666 | } while (skip--); | |
667 | ||
668 | return dev_to_disk(dev); | |
68c4d4a7 GKH |
669 | } |
670 | ||
def4e38d | 671 | static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
1da177e4 | 672 | { |
edfaa7c3 | 673 | struct device *dev; |
1da177e4 | 674 | |
def4e38d TH |
675 | (*pos)++; |
676 | dev = class_dev_iter_next(seqf->private); | |
2ac3cee5 | 677 | if (dev) |
68c4d4a7 | 678 | return dev_to_disk(dev); |
2ac3cee5 | 679 | |
1da177e4 LT |
680 | return NULL; |
681 | } | |
682 | ||
def4e38d | 683 | static void disk_seqf_stop(struct seq_file *seqf, void *v) |
27f30251 | 684 | { |
def4e38d | 685 | struct class_dev_iter *iter = seqf->private; |
27f30251 | 686 | |
def4e38d TH |
687 | /* stop is called even after start failed :-( */ |
688 | if (iter) { | |
689 | class_dev_iter_exit(iter); | |
690 | kfree(iter); | |
5c0ef6d0 | 691 | } |
1da177e4 LT |
692 | } |
693 | ||
def4e38d | 694 | static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
1da177e4 | 695 | { |
def4e38d TH |
696 | static void *p; |
697 | ||
698 | p = disk_seqf_start(seqf, pos); | |
243294da | 699 | if (!IS_ERR(p) && p && !*pos) |
def4e38d TH |
700 | seq_puts(seqf, "major minor #blocks name\n\n"); |
701 | return p; | |
1da177e4 LT |
702 | } |
703 | ||
cf771cb5 | 704 | static int show_partition(struct seq_file *seqf, void *v) |
1da177e4 LT |
705 | { |
706 | struct gendisk *sgp = v; | |
e71bf0d0 TH |
707 | struct disk_part_iter piter; |
708 | struct hd_struct *part; | |
1da177e4 LT |
709 | char buf[BDEVNAME_SIZE]; |
710 | ||
1da177e4 | 711 | /* Don't show non-partitionable removeable devices or empty devices */ |
b5d0b9df | 712 | if (!get_capacity(sgp) || (!disk_partitionable(sgp) && |
f331c029 | 713 | (sgp->flags & GENHD_FL_REMOVABLE))) |
1da177e4 LT |
714 | return 0; |
715 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
716 | return 0; | |
717 | ||
718 | /* show the full disk and all non-0 size partitions of it */ | |
074a7aca | 719 | disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0); |
e71bf0d0 | 720 | while ((part = disk_part_iter_next(&piter))) |
1f014290 | 721 | seq_printf(seqf, "%4d %7d %10llu %s\n", |
f331c029 TH |
722 | MAJOR(part_devt(part)), MINOR(part_devt(part)), |
723 | (unsigned long long)part->nr_sects >> 1, | |
724 | disk_name(sgp, part->partno, buf)); | |
e71bf0d0 | 725 | disk_part_iter_exit(&piter); |
1da177e4 LT |
726 | |
727 | return 0; | |
728 | } | |
729 | ||
12f32bb3 | 730 | const struct seq_operations partitions_op = { |
def4e38d TH |
731 | .start = show_partition_start, |
732 | .next = disk_seqf_next, | |
733 | .stop = disk_seqf_stop, | |
edfaa7c3 | 734 | .show = show_partition |
1da177e4 LT |
735 | }; |
736 | #endif | |
737 | ||
738 | ||
cf771cb5 | 739 | static struct kobject *base_probe(dev_t devt, int *partno, void *data) |
1da177e4 | 740 | { |
edfaa7c3 | 741 | if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
1da177e4 | 742 | /* Make old-style 2.4 aliases work */ |
edfaa7c3 | 743 | request_module("block-major-%d", MAJOR(devt)); |
1da177e4 LT |
744 | return NULL; |
745 | } | |
746 | ||
747 | static int __init genhd_device_init(void) | |
748 | { | |
e105b8bf DW |
749 | int error; |
750 | ||
751 | block_class.dev_kobj = sysfs_dev_block_kobj; | |
752 | error = class_register(&block_class); | |
ee27a558 RM |
753 | if (unlikely(error)) |
754 | return error; | |
edfaa7c3 | 755 | bdev_map = kobj_map_init(base_probe, &block_class_lock); |
1da177e4 | 756 | blk_dev_init(); |
edfaa7c3 KS |
757 | |
758 | #ifndef CONFIG_SYSFS_DEPRECATED | |
759 | /* create top-level block dir */ | |
760 | block_depr = kobject_create_and_add("block", NULL); | |
761 | #endif | |
830d3cfb | 762 | return 0; |
1da177e4 LT |
763 | } |
764 | ||
765 | subsys_initcall(genhd_device_init); | |
766 | ||
edfaa7c3 KS |
767 | static ssize_t disk_range_show(struct device *dev, |
768 | struct device_attribute *attr, char *buf) | |
1da177e4 | 769 | { |
edfaa7c3 | 770 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 771 | |
edfaa7c3 | 772 | return sprintf(buf, "%d\n", disk->minors); |
1da177e4 LT |
773 | } |
774 | ||
1f014290 TH |
775 | static ssize_t disk_ext_range_show(struct device *dev, |
776 | struct device_attribute *attr, char *buf) | |
777 | { | |
778 | struct gendisk *disk = dev_to_disk(dev); | |
779 | ||
b5d0b9df | 780 | return sprintf(buf, "%d\n", disk_max_parts(disk)); |
1f014290 TH |
781 | } |
782 | ||
edfaa7c3 KS |
783 | static ssize_t disk_removable_show(struct device *dev, |
784 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 785 | { |
edfaa7c3 | 786 | struct gendisk *disk = dev_to_disk(dev); |
a7fd6706 | 787 | |
edfaa7c3 KS |
788 | return sprintf(buf, "%d\n", |
789 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
a7fd6706 KS |
790 | } |
791 | ||
1c9ce527 KS |
792 | static ssize_t disk_ro_show(struct device *dev, |
793 | struct device_attribute *attr, char *buf) | |
794 | { | |
795 | struct gendisk *disk = dev_to_disk(dev); | |
796 | ||
b7db9956 | 797 | return sprintf(buf, "%d\n", get_disk_ro(disk) ? 1 : 0); |
1c9ce527 KS |
798 | } |
799 | ||
edfaa7c3 KS |
800 | static ssize_t disk_capability_show(struct device *dev, |
801 | struct device_attribute *attr, char *buf) | |
86ce18d7 | 802 | { |
edfaa7c3 KS |
803 | struct gendisk *disk = dev_to_disk(dev); |
804 | ||
805 | return sprintf(buf, "%x\n", disk->flags); | |
86ce18d7 | 806 | } |
edfaa7c3 | 807 | |
edfaa7c3 | 808 | static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); |
1f014290 | 809 | static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL); |
edfaa7c3 | 810 | static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); |
1c9ce527 | 811 | static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); |
e5610521 | 812 | static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); |
edfaa7c3 | 813 | static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); |
074a7aca | 814 | static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); |
c17bb495 | 815 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 | 816 | static struct device_attribute dev_attr_fail = |
eddb2e26 | 817 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); |
c17bb495 | 818 | #endif |
581d4e28 JA |
819 | #ifdef CONFIG_FAIL_IO_TIMEOUT |
820 | static struct device_attribute dev_attr_fail_timeout = | |
821 | __ATTR(io-timeout-fail, S_IRUGO|S_IWUSR, part_timeout_show, | |
822 | part_timeout_store); | |
823 | #endif | |
edfaa7c3 KS |
824 | |
825 | static struct attribute *disk_attrs[] = { | |
826 | &dev_attr_range.attr, | |
1f014290 | 827 | &dev_attr_ext_range.attr, |
edfaa7c3 | 828 | &dev_attr_removable.attr, |
1c9ce527 | 829 | &dev_attr_ro.attr, |
edfaa7c3 KS |
830 | &dev_attr_size.attr, |
831 | &dev_attr_capability.attr, | |
832 | &dev_attr_stat.attr, | |
833 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
834 | &dev_attr_fail.attr, | |
581d4e28 JA |
835 | #endif |
836 | #ifdef CONFIG_FAIL_IO_TIMEOUT | |
837 | &dev_attr_fail_timeout.attr, | |
edfaa7c3 KS |
838 | #endif |
839 | NULL | |
840 | }; | |
841 | ||
842 | static struct attribute_group disk_attr_group = { | |
843 | .attrs = disk_attrs, | |
844 | }; | |
845 | ||
846 | static struct attribute_group *disk_attr_groups[] = { | |
847 | &disk_attr_group, | |
848 | NULL | |
1da177e4 LT |
849 | }; |
850 | ||
540eed56 TH |
851 | static void disk_free_ptbl_rcu_cb(struct rcu_head *head) |
852 | { | |
853 | struct disk_part_tbl *ptbl = | |
854 | container_of(head, struct disk_part_tbl, rcu_head); | |
855 | ||
856 | kfree(ptbl); | |
857 | } | |
858 | ||
859 | /** | |
860 | * disk_replace_part_tbl - replace disk->part_tbl in RCU-safe way | |
861 | * @disk: disk to replace part_tbl for | |
862 | * @new_ptbl: new part_tbl to install | |
863 | * | |
864 | * Replace disk->part_tbl with @new_ptbl in RCU-safe way. The | |
865 | * original ptbl is freed using RCU callback. | |
866 | * | |
867 | * LOCKING: | |
868 | * Matching bd_mutx locked. | |
869 | */ | |
870 | static void disk_replace_part_tbl(struct gendisk *disk, | |
871 | struct disk_part_tbl *new_ptbl) | |
872 | { | |
873 | struct disk_part_tbl *old_ptbl = disk->part_tbl; | |
874 | ||
875 | rcu_assign_pointer(disk->part_tbl, new_ptbl); | |
876 | if (old_ptbl) | |
877 | call_rcu(&old_ptbl->rcu_head, disk_free_ptbl_rcu_cb); | |
878 | } | |
879 | ||
880 | /** | |
881 | * disk_expand_part_tbl - expand disk->part_tbl | |
882 | * @disk: disk to expand part_tbl for | |
883 | * @partno: expand such that this partno can fit in | |
884 | * | |
885 | * Expand disk->part_tbl such that @partno can fit in. disk->part_tbl | |
886 | * uses RCU to allow unlocked dereferencing for stats and other stuff. | |
887 | * | |
888 | * LOCKING: | |
889 | * Matching bd_mutex locked, might sleep. | |
890 | * | |
891 | * RETURNS: | |
892 | * 0 on success, -errno on failure. | |
893 | */ | |
894 | int disk_expand_part_tbl(struct gendisk *disk, int partno) | |
895 | { | |
896 | struct disk_part_tbl *old_ptbl = disk->part_tbl; | |
897 | struct disk_part_tbl *new_ptbl; | |
898 | int len = old_ptbl ? old_ptbl->len : 0; | |
899 | int target = partno + 1; | |
900 | size_t size; | |
901 | int i; | |
902 | ||
903 | /* disk_max_parts() is zero during initialization, ignore if so */ | |
904 | if (disk_max_parts(disk) && target > disk_max_parts(disk)) | |
905 | return -EINVAL; | |
906 | ||
907 | if (target <= len) | |
908 | return 0; | |
909 | ||
910 | size = sizeof(*new_ptbl) + target * sizeof(new_ptbl->part[0]); | |
911 | new_ptbl = kzalloc_node(size, GFP_KERNEL, disk->node_id); | |
912 | if (!new_ptbl) | |
913 | return -ENOMEM; | |
914 | ||
915 | INIT_RCU_HEAD(&new_ptbl->rcu_head); | |
916 | new_ptbl->len = target; | |
917 | ||
918 | for (i = 0; i < len; i++) | |
919 | rcu_assign_pointer(new_ptbl->part[i], old_ptbl->part[i]); | |
920 | ||
921 | disk_replace_part_tbl(disk, new_ptbl); | |
922 | return 0; | |
923 | } | |
924 | ||
edfaa7c3 | 925 | static void disk_release(struct device *dev) |
1da177e4 | 926 | { |
edfaa7c3 KS |
927 | struct gendisk *disk = dev_to_disk(dev); |
928 | ||
1da177e4 | 929 | kfree(disk->random); |
540eed56 | 930 | disk_replace_part_tbl(disk, NULL); |
074a7aca | 931 | free_part_stats(&disk->part0); |
1da177e4 LT |
932 | kfree(disk); |
933 | } | |
edfaa7c3 KS |
934 | struct class block_class = { |
935 | .name = "block", | |
1da177e4 LT |
936 | }; |
937 | ||
1826eadf | 938 | static struct device_type disk_type = { |
edfaa7c3 KS |
939 | .name = "disk", |
940 | .groups = disk_attr_groups, | |
941 | .release = disk_release, | |
1da177e4 LT |
942 | }; |
943 | ||
a6e2ba88 | 944 | #ifdef CONFIG_PROC_FS |
cf771cb5 TH |
945 | /* |
946 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
947 | * entries do, above, but makes them available through one seq_file. | |
948 | * | |
949 | * The output looks suspiciously like /proc/partitions with a bunch of | |
950 | * extra fields. | |
951 | */ | |
952 | static int diskstats_show(struct seq_file *seqf, void *v) | |
1da177e4 LT |
953 | { |
954 | struct gendisk *gp = v; | |
e71bf0d0 TH |
955 | struct disk_part_iter piter; |
956 | struct hd_struct *hd; | |
1da177e4 | 957 | char buf[BDEVNAME_SIZE]; |
c9959059 | 958 | int cpu; |
1da177e4 LT |
959 | |
960 | /* | |
ed9e1982 | 961 | if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) |
cf771cb5 | 962 | seq_puts(seqf, "major minor name" |
1da177e4 LT |
963 | " rio rmerge rsect ruse wio wmerge " |
964 | "wsect wuse running use aveq" | |
965 | "\n\n"); | |
966 | */ | |
967 | ||
074a7aca | 968 | disk_part_iter_init(&piter, gp, DISK_PITER_INCL_PART0); |
e71bf0d0 | 969 | while ((hd = disk_part_iter_next(&piter))) { |
074a7aca | 970 | cpu = part_stat_lock(); |
c9959059 | 971 | part_round_stats(cpu, hd); |
074a7aca | 972 | part_stat_unlock(); |
1f014290 | 973 | seq_printf(seqf, "%4d %7d %s %lu %lu %llu " |
28f39d55 | 974 | "%u %lu %lu %llu %u %u %u %u\n", |
f331c029 TH |
975 | MAJOR(part_devt(hd)), MINOR(part_devt(hd)), |
976 | disk_name(gp, hd->partno, buf), | |
28f39d55 JM |
977 | part_stat_read(hd, ios[0]), |
978 | part_stat_read(hd, merges[0]), | |
979 | (unsigned long long)part_stat_read(hd, sectors[0]), | |
980 | jiffies_to_msecs(part_stat_read(hd, ticks[0])), | |
981 | part_stat_read(hd, ios[1]), | |
982 | part_stat_read(hd, merges[1]), | |
983 | (unsigned long long)part_stat_read(hd, sectors[1]), | |
984 | jiffies_to_msecs(part_stat_read(hd, ticks[1])), | |
985 | hd->in_flight, | |
986 | jiffies_to_msecs(part_stat_read(hd, io_ticks)), | |
987 | jiffies_to_msecs(part_stat_read(hd, time_in_queue)) | |
988 | ); | |
1da177e4 | 989 | } |
e71bf0d0 | 990 | disk_part_iter_exit(&piter); |
1da177e4 LT |
991 | |
992 | return 0; | |
993 | } | |
994 | ||
12f32bb3 | 995 | const struct seq_operations diskstats_op = { |
def4e38d TH |
996 | .start = disk_seqf_start, |
997 | .next = disk_seqf_next, | |
998 | .stop = disk_seqf_stop, | |
1da177e4 LT |
999 | .show = diskstats_show |
1000 | }; | |
a6e2ba88 | 1001 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 1002 | |
8ce7ad7b KCA |
1003 | static void media_change_notify_thread(struct work_struct *work) |
1004 | { | |
1005 | struct gendisk *gd = container_of(work, struct gendisk, async_notify); | |
1006 | char event[] = "MEDIA_CHANGE=1"; | |
1007 | char *envp[] = { event, NULL }; | |
1008 | ||
1009 | /* | |
1010 | * set enviroment vars to indicate which event this is for | |
1011 | * so that user space will know to go check the media status. | |
1012 | */ | |
ed9e1982 | 1013 | kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp); |
8ce7ad7b KCA |
1014 | put_device(gd->driverfs_dev); |
1015 | } | |
1016 | ||
1826eadf | 1017 | #if 0 |
8ce7ad7b KCA |
1018 | void genhd_media_change_notify(struct gendisk *disk) |
1019 | { | |
1020 | get_device(disk->driverfs_dev); | |
1021 | schedule_work(&disk->async_notify); | |
1022 | } | |
1023 | EXPORT_SYMBOL_GPL(genhd_media_change_notify); | |
1826eadf | 1024 | #endif /* 0 */ |
8ce7ad7b | 1025 | |
cf771cb5 | 1026 | dev_t blk_lookup_devt(const char *name, int partno) |
a142be85 | 1027 | { |
def4e38d TH |
1028 | dev_t devt = MKDEV(0, 0); |
1029 | struct class_dev_iter iter; | |
1030 | struct device *dev; | |
a142be85 | 1031 | |
def4e38d TH |
1032 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); |
1033 | while ((dev = class_dev_iter_next(&iter))) { | |
a142be85 | 1034 | struct gendisk *disk = dev_to_disk(dev); |
548b10eb | 1035 | struct hd_struct *part; |
a142be85 | 1036 | |
f331c029 TH |
1037 | if (strcmp(dev->bus_id, name)) |
1038 | continue; | |
f331c029 | 1039 | |
548b10eb | 1040 | part = disk_get_part(disk, partno); |
2bbedcb4 | 1041 | if (part) { |
f331c029 | 1042 | devt = part_devt(part); |
e71bf0d0 | 1043 | disk_put_part(part); |
548b10eb | 1044 | break; |
def4e38d | 1045 | } |
548b10eb | 1046 | disk_put_part(part); |
5c0ef6d0 | 1047 | } |
def4e38d | 1048 | class_dev_iter_exit(&iter); |
edfaa7c3 KS |
1049 | return devt; |
1050 | } | |
edfaa7c3 KS |
1051 | EXPORT_SYMBOL(blk_lookup_devt); |
1052 | ||
1da177e4 LT |
1053 | struct gendisk *alloc_disk(int minors) |
1054 | { | |
1946089a CL |
1055 | return alloc_disk_node(minors, -1); |
1056 | } | |
689d6fac | 1057 | EXPORT_SYMBOL(alloc_disk); |
1946089a CL |
1058 | |
1059 | struct gendisk *alloc_disk_node(int minors, int node_id) | |
1060 | { | |
1061 | struct gendisk *disk; | |
1062 | ||
94f6030c CL |
1063 | disk = kmalloc_node(sizeof(struct gendisk), |
1064 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 1065 | if (disk) { |
074a7aca | 1066 | if (!init_part_stats(&disk->part0)) { |
1da177e4 LT |
1067 | kfree(disk); |
1068 | return NULL; | |
1069 | } | |
540eed56 TH |
1070 | if (disk_expand_part_tbl(disk, 0)) { |
1071 | free_part_stats(&disk->part0); | |
b5d0b9df TH |
1072 | kfree(disk); |
1073 | return NULL; | |
1da177e4 | 1074 | } |
540eed56 | 1075 | disk->part_tbl->part[0] = &disk->part0; |
b5d0b9df | 1076 | |
1da177e4 | 1077 | disk->minors = minors; |
1da177e4 | 1078 | rand_initialize_disk(disk); |
ed9e1982 TH |
1079 | disk_to_dev(disk)->class = &block_class; |
1080 | disk_to_dev(disk)->type = &disk_type; | |
1081 | device_initialize(disk_to_dev(disk)); | |
8ce7ad7b KCA |
1082 | INIT_WORK(&disk->async_notify, |
1083 | media_change_notify_thread); | |
540eed56 | 1084 | disk->node_id = node_id; |
1da177e4 LT |
1085 | } |
1086 | return disk; | |
1087 | } | |
1946089a | 1088 | EXPORT_SYMBOL(alloc_disk_node); |
1da177e4 LT |
1089 | |
1090 | struct kobject *get_disk(struct gendisk *disk) | |
1091 | { | |
1092 | struct module *owner; | |
1093 | struct kobject *kobj; | |
1094 | ||
1095 | if (!disk->fops) | |
1096 | return NULL; | |
1097 | owner = disk->fops->owner; | |
1098 | if (owner && !try_module_get(owner)) | |
1099 | return NULL; | |
ed9e1982 | 1100 | kobj = kobject_get(&disk_to_dev(disk)->kobj); |
1da177e4 LT |
1101 | if (kobj == NULL) { |
1102 | module_put(owner); | |
1103 | return NULL; | |
1104 | } | |
1105 | return kobj; | |
1106 | ||
1107 | } | |
1108 | ||
1109 | EXPORT_SYMBOL(get_disk); | |
1110 | ||
1111 | void put_disk(struct gendisk *disk) | |
1112 | { | |
1113 | if (disk) | |
ed9e1982 | 1114 | kobject_put(&disk_to_dev(disk)->kobj); |
1da177e4 LT |
1115 | } |
1116 | ||
1117 | EXPORT_SYMBOL(put_disk); | |
1118 | ||
1119 | void set_device_ro(struct block_device *bdev, int flag) | |
1120 | { | |
b7db9956 | 1121 | bdev->bd_part->policy = flag; |
1da177e4 LT |
1122 | } |
1123 | ||
1124 | EXPORT_SYMBOL(set_device_ro); | |
1125 | ||
1126 | void set_disk_ro(struct gendisk *disk, int flag) | |
1127 | { | |
e71bf0d0 TH |
1128 | struct disk_part_iter piter; |
1129 | struct hd_struct *part; | |
1130 | ||
b7db9956 TH |
1131 | disk_part_iter_init(&piter, disk, |
1132 | DISK_PITER_INCL_EMPTY | DISK_PITER_INCL_PART0); | |
e71bf0d0 TH |
1133 | while ((part = disk_part_iter_next(&piter))) |
1134 | part->policy = flag; | |
1135 | disk_part_iter_exit(&piter); | |
1da177e4 LT |
1136 | } |
1137 | ||
1138 | EXPORT_SYMBOL(set_disk_ro); | |
1139 | ||
1140 | int bdev_read_only(struct block_device *bdev) | |
1141 | { | |
1142 | if (!bdev) | |
1143 | return 0; | |
b7db9956 | 1144 | return bdev->bd_part->policy; |
1da177e4 LT |
1145 | } |
1146 | ||
1147 | EXPORT_SYMBOL(bdev_read_only); | |
1148 | ||
cf771cb5 | 1149 | int invalidate_partition(struct gendisk *disk, int partno) |
1da177e4 LT |
1150 | { |
1151 | int res = 0; | |
cf771cb5 | 1152 | struct block_device *bdev = bdget_disk(disk, partno); |
1da177e4 | 1153 | if (bdev) { |
2ef41634 CH |
1154 | fsync_bdev(bdev); |
1155 | res = __invalidate_device(bdev); | |
1da177e4 LT |
1156 | bdput(bdev); |
1157 | } | |
1158 | return res; | |
1159 | } | |
1160 | ||
1161 | EXPORT_SYMBOL(invalidate_partition); |