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 | ||
870d6656 TH |
301 | /** |
302 | * blk_mangle_minor - scatter minor numbers apart | |
303 | * @minor: minor number to mangle | |
304 | * | |
305 | * Scatter consecutively allocated @minor number apart if MANGLE_DEVT | |
306 | * is enabled. Mangling twice gives the original value. | |
307 | * | |
308 | * RETURNS: | |
309 | * Mangled value. | |
310 | * | |
311 | * CONTEXT: | |
312 | * Don't care. | |
313 | */ | |
314 | static int blk_mangle_minor(int minor) | |
315 | { | |
316 | #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT | |
317 | int i; | |
318 | ||
319 | for (i = 0; i < MINORBITS / 2; i++) { | |
320 | int low = minor & (1 << i); | |
321 | int high = minor & (1 << (MINORBITS - 1 - i)); | |
322 | int distance = MINORBITS - 1 - 2 * i; | |
323 | ||
324 | minor ^= low | high; /* clear both bits */ | |
325 | low <<= distance; /* swap the positions */ | |
326 | high >>= distance; | |
327 | minor |= low | high; /* and set */ | |
328 | } | |
329 | #endif | |
330 | return minor; | |
331 | } | |
332 | ||
bcce3de1 TH |
333 | /** |
334 | * blk_alloc_devt - allocate a dev_t for a partition | |
335 | * @part: partition to allocate dev_t for | |
336 | * @gfp_mask: memory allocation flag | |
337 | * @devt: out parameter for resulting dev_t | |
338 | * | |
339 | * Allocate a dev_t for block device. | |
340 | * | |
341 | * RETURNS: | |
342 | * 0 on success, allocated dev_t is returned in *@devt. -errno on | |
343 | * failure. | |
344 | * | |
345 | * CONTEXT: | |
346 | * Might sleep. | |
347 | */ | |
348 | int blk_alloc_devt(struct hd_struct *part, dev_t *devt) | |
349 | { | |
350 | struct gendisk *disk = part_to_disk(part); | |
351 | int idx, rc; | |
352 | ||
353 | /* in consecutive minor range? */ | |
354 | if (part->partno < disk->minors) { | |
355 | *devt = MKDEV(disk->major, disk->first_minor + part->partno); | |
356 | return 0; | |
357 | } | |
358 | ||
359 | /* allocate ext devt */ | |
360 | do { | |
361 | if (!idr_pre_get(&ext_devt_idr, GFP_KERNEL)) | |
362 | return -ENOMEM; | |
363 | rc = idr_get_new(&ext_devt_idr, part, &idx); | |
364 | } while (rc == -EAGAIN); | |
365 | ||
366 | if (rc) | |
367 | return rc; | |
368 | ||
369 | if (idx > MAX_EXT_DEVT) { | |
370 | idr_remove(&ext_devt_idr, idx); | |
371 | return -EBUSY; | |
372 | } | |
373 | ||
870d6656 | 374 | *devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx)); |
bcce3de1 TH |
375 | return 0; |
376 | } | |
377 | ||
378 | /** | |
379 | * blk_free_devt - free a dev_t | |
380 | * @devt: dev_t to free | |
381 | * | |
382 | * Free @devt which was allocated using blk_alloc_devt(). | |
383 | * | |
384 | * CONTEXT: | |
385 | * Might sleep. | |
386 | */ | |
387 | void blk_free_devt(dev_t devt) | |
388 | { | |
389 | might_sleep(); | |
390 | ||
391 | if (devt == MKDEV(0, 0)) | |
392 | return; | |
393 | ||
394 | if (MAJOR(devt) == BLOCK_EXT_MAJOR) { | |
395 | mutex_lock(&ext_devt_mutex); | |
870d6656 | 396 | idr_remove(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
bcce3de1 TH |
397 | mutex_unlock(&ext_devt_mutex); |
398 | } | |
399 | } | |
400 | ||
1f014290 TH |
401 | static char *bdevt_str(dev_t devt, char *buf) |
402 | { | |
403 | if (MAJOR(devt) <= 0xff && MINOR(devt) <= 0xff) { | |
404 | char tbuf[BDEVT_SIZE]; | |
405 | snprintf(tbuf, BDEVT_SIZE, "%02x%02x", MAJOR(devt), MINOR(devt)); | |
406 | snprintf(buf, BDEVT_SIZE, "%-9s", tbuf); | |
407 | } else | |
408 | snprintf(buf, BDEVT_SIZE, "%03x:%05x", MAJOR(devt), MINOR(devt)); | |
409 | ||
410 | return buf; | |
411 | } | |
412 | ||
1da177e4 LT |
413 | /* |
414 | * Register device numbers dev..(dev+range-1) | |
415 | * range must be nonzero | |
416 | * The hash chain is sorted on range, so that subranges can override. | |
417 | */ | |
edfaa7c3 | 418 | void blk_register_region(dev_t devt, unsigned long range, struct module *module, |
1da177e4 LT |
419 | struct kobject *(*probe)(dev_t, int *, void *), |
420 | int (*lock)(dev_t, void *), void *data) | |
421 | { | |
edfaa7c3 | 422 | kobj_map(bdev_map, devt, range, module, probe, lock, data); |
1da177e4 LT |
423 | } |
424 | ||
425 | EXPORT_SYMBOL(blk_register_region); | |
426 | ||
edfaa7c3 | 427 | void blk_unregister_region(dev_t devt, unsigned long range) |
1da177e4 | 428 | { |
edfaa7c3 | 429 | kobj_unmap(bdev_map, devt, range); |
1da177e4 LT |
430 | } |
431 | ||
432 | EXPORT_SYMBOL(blk_unregister_region); | |
433 | ||
cf771cb5 | 434 | static struct kobject *exact_match(dev_t devt, int *partno, void *data) |
1da177e4 LT |
435 | { |
436 | struct gendisk *p = data; | |
edfaa7c3 KS |
437 | |
438 | return &p->dev.kobj; | |
1da177e4 LT |
439 | } |
440 | ||
edfaa7c3 | 441 | static int exact_lock(dev_t devt, void *data) |
1da177e4 LT |
442 | { |
443 | struct gendisk *p = data; | |
444 | ||
445 | if (!get_disk(p)) | |
446 | return -1; | |
447 | return 0; | |
448 | } | |
449 | ||
450 | /** | |
451 | * add_disk - add partitioning information to kernel list | |
452 | * @disk: per-device partitioning information | |
453 | * | |
454 | * This function registers the partitioning information in @disk | |
455 | * with the kernel. | |
456 | */ | |
457 | void add_disk(struct gendisk *disk) | |
458 | { | |
cf0ca9fe | 459 | struct backing_dev_info *bdi; |
6ffeea77 | 460 | int retval; |
cf0ca9fe | 461 | |
1da177e4 | 462 | disk->flags |= GENHD_FL_UP; |
f331c029 TH |
463 | disk->dev.devt = MKDEV(disk->major, disk->first_minor); |
464 | blk_register_region(disk_devt(disk), disk->minors, NULL, | |
465 | exact_match, exact_lock, disk); | |
1da177e4 LT |
466 | register_disk(disk); |
467 | blk_register_queue(disk); | |
cf0ca9fe PZ |
468 | |
469 | bdi = &disk->queue->backing_dev_info; | |
f331c029 | 470 | bdi_register_dev(bdi, disk_devt(disk)); |
6ffeea77 GKH |
471 | retval = sysfs_create_link(&disk->dev.kobj, &bdi->dev->kobj, "bdi"); |
472 | WARN_ON(retval); | |
1da177e4 LT |
473 | } |
474 | ||
475 | EXPORT_SYMBOL(add_disk); | |
476 | EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ | |
477 | ||
478 | void unlink_gendisk(struct gendisk *disk) | |
479 | { | |
cf0ca9fe PZ |
480 | sysfs_remove_link(&disk->dev.kobj, "bdi"); |
481 | bdi_unregister(&disk->queue->backing_dev_info); | |
1da177e4 | 482 | blk_unregister_queue(disk); |
f331c029 | 483 | blk_unregister_region(disk_devt(disk), disk->minors); |
1da177e4 LT |
484 | } |
485 | ||
1da177e4 LT |
486 | /** |
487 | * get_gendisk - get partitioning information for a given device | |
710027a4 RD |
488 | * @devt: device to get partitioning information for |
489 | * @part: returned partition index | |
1da177e4 LT |
490 | * |
491 | * This function gets the structure containing partitioning | |
710027a4 | 492 | * information for the given device @devt. |
1da177e4 | 493 | */ |
cf771cb5 | 494 | struct gendisk *get_gendisk(dev_t devt, int *partno) |
1da177e4 | 495 | { |
bcce3de1 TH |
496 | struct gendisk *disk = NULL; |
497 | ||
498 | if (MAJOR(devt) != BLOCK_EXT_MAJOR) { | |
499 | struct kobject *kobj; | |
500 | ||
501 | kobj = kobj_lookup(bdev_map, devt, partno); | |
502 | if (kobj) | |
503 | disk = dev_to_disk(kobj_to_dev(kobj)); | |
504 | } else { | |
505 | struct hd_struct *part; | |
506 | ||
507 | mutex_lock(&ext_devt_mutex); | |
870d6656 | 508 | part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
bcce3de1 TH |
509 | if (part && get_disk(part_to_disk(part))) { |
510 | *partno = part->partno; | |
511 | disk = part_to_disk(part); | |
512 | } | |
513 | mutex_unlock(&ext_devt_mutex); | |
514 | } | |
edfaa7c3 | 515 | |
bcce3de1 | 516 | return disk; |
1da177e4 LT |
517 | } |
518 | ||
f331c029 TH |
519 | /** |
520 | * bdget_disk - do bdget() by gendisk and partition number | |
521 | * @disk: gendisk of interest | |
522 | * @partno: partition number | |
523 | * | |
524 | * Find partition @partno from @disk, do bdget() on it. | |
525 | * | |
526 | * CONTEXT: | |
527 | * Don't care. | |
528 | * | |
529 | * RETURNS: | |
530 | * Resulting block_device on success, NULL on failure. | |
531 | */ | |
532 | extern struct block_device *bdget_disk(struct gendisk *disk, int partno) | |
533 | { | |
534 | dev_t devt = MKDEV(0, 0); | |
535 | ||
536 | if (partno == 0) | |
537 | devt = disk_devt(disk); | |
538 | else { | |
e71bf0d0 | 539 | struct hd_struct *part; |
f331c029 | 540 | |
e71bf0d0 | 541 | part = disk_get_part(disk, partno); |
f331c029 TH |
542 | if (part && part->nr_sects) |
543 | devt = part_devt(part); | |
e71bf0d0 | 544 | disk_put_part(part); |
f331c029 TH |
545 | } |
546 | ||
547 | if (likely(devt != MKDEV(0, 0))) | |
548 | return bdget(devt); | |
549 | return NULL; | |
550 | } | |
551 | EXPORT_SYMBOL(bdget_disk); | |
552 | ||
5c6f35c5 GKH |
553 | /* |
554 | * print a full list of all partitions - intended for places where the root | |
555 | * filesystem can't be mounted and thus to give the victim some idea of what | |
556 | * went wrong | |
557 | */ | |
558 | void __init printk_all_partitions(void) | |
559 | { | |
def4e38d TH |
560 | struct class_dev_iter iter; |
561 | struct device *dev; | |
562 | ||
563 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); | |
564 | while ((dev = class_dev_iter_next(&iter))) { | |
565 | struct gendisk *disk = dev_to_disk(dev); | |
e71bf0d0 TH |
566 | struct disk_part_iter piter; |
567 | struct hd_struct *part; | |
1f014290 TH |
568 | char name_buf[BDEVNAME_SIZE]; |
569 | char devt_buf[BDEVT_SIZE]; | |
def4e38d TH |
570 | |
571 | /* | |
572 | * Don't show empty devices or things that have been | |
573 | * surpressed | |
574 | */ | |
575 | if (get_capacity(disk) == 0 || | |
576 | (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) | |
577 | continue; | |
578 | ||
579 | /* | |
580 | * Note, unlike /proc/partitions, I am showing the | |
581 | * numbers in hex - the same format as the root= | |
582 | * option takes. | |
583 | */ | |
1f014290 TH |
584 | printk("%s %10llu %s", |
585 | bdevt_str(disk_devt(disk), devt_buf), | |
def4e38d | 586 | (unsigned long long)get_capacity(disk) >> 1, |
1f014290 | 587 | disk_name(disk, 0, name_buf)); |
def4e38d TH |
588 | if (disk->driverfs_dev != NULL && |
589 | disk->driverfs_dev->driver != NULL) | |
590 | printk(" driver: %s\n", | |
591 | disk->driverfs_dev->driver->name); | |
592 | else | |
593 | printk(" (driver?)\n"); | |
594 | ||
595 | /* now show the partitions */ | |
e71bf0d0 TH |
596 | disk_part_iter_init(&piter, disk, 0); |
597 | while ((part = disk_part_iter_next(&piter))) | |
1f014290 TH |
598 | printk(" %s %10llu %s\n", |
599 | bdevt_str(part_devt(part), devt_buf), | |
f331c029 | 600 | (unsigned long long)part->nr_sects >> 1, |
1f014290 | 601 | disk_name(disk, part->partno, name_buf)); |
e71bf0d0 | 602 | disk_part_iter_exit(&piter); |
def4e38d TH |
603 | } |
604 | class_dev_iter_exit(&iter); | |
dd2a345f DG |
605 | } |
606 | ||
1da177e4 LT |
607 | #ifdef CONFIG_PROC_FS |
608 | /* iterator */ | |
def4e38d | 609 | static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
68c4d4a7 | 610 | { |
def4e38d TH |
611 | loff_t skip = *pos; |
612 | struct class_dev_iter *iter; | |
613 | struct device *dev; | |
68c4d4a7 | 614 | |
def4e38d TH |
615 | iter = kmalloc(GFP_KERNEL, sizeof(*iter)); |
616 | if (!iter) | |
617 | return ERR_PTR(-ENOMEM); | |
618 | ||
619 | seqf->private = iter; | |
620 | class_dev_iter_init(iter, &block_class, NULL, &disk_type); | |
621 | do { | |
622 | dev = class_dev_iter_next(iter); | |
623 | if (!dev) | |
624 | return NULL; | |
625 | } while (skip--); | |
626 | ||
627 | return dev_to_disk(dev); | |
68c4d4a7 GKH |
628 | } |
629 | ||
def4e38d | 630 | static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
1da177e4 | 631 | { |
edfaa7c3 | 632 | struct device *dev; |
1da177e4 | 633 | |
def4e38d TH |
634 | (*pos)++; |
635 | dev = class_dev_iter_next(seqf->private); | |
2ac3cee5 | 636 | if (dev) |
68c4d4a7 | 637 | return dev_to_disk(dev); |
2ac3cee5 | 638 | |
1da177e4 LT |
639 | return NULL; |
640 | } | |
641 | ||
def4e38d | 642 | static void disk_seqf_stop(struct seq_file *seqf, void *v) |
27f30251 | 643 | { |
def4e38d | 644 | struct class_dev_iter *iter = seqf->private; |
27f30251 | 645 | |
def4e38d TH |
646 | /* stop is called even after start failed :-( */ |
647 | if (iter) { | |
648 | class_dev_iter_exit(iter); | |
649 | kfree(iter); | |
5c0ef6d0 | 650 | } |
1da177e4 LT |
651 | } |
652 | ||
def4e38d | 653 | static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
1da177e4 | 654 | { |
def4e38d TH |
655 | static void *p; |
656 | ||
657 | p = disk_seqf_start(seqf, pos); | |
658 | if (!IS_ERR(p) && p) | |
659 | seq_puts(seqf, "major minor #blocks name\n\n"); | |
660 | return p; | |
1da177e4 LT |
661 | } |
662 | ||
cf771cb5 | 663 | static int show_partition(struct seq_file *seqf, void *v) |
1da177e4 LT |
664 | { |
665 | struct gendisk *sgp = v; | |
e71bf0d0 TH |
666 | struct disk_part_iter piter; |
667 | struct hd_struct *part; | |
1da177e4 LT |
668 | char buf[BDEVNAME_SIZE]; |
669 | ||
1da177e4 | 670 | /* Don't show non-partitionable removeable devices or empty devices */ |
f331c029 TH |
671 | if (!get_capacity(sgp) || (!disk_max_parts(sgp) && |
672 | (sgp->flags & GENHD_FL_REMOVABLE))) | |
1da177e4 LT |
673 | return 0; |
674 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
675 | return 0; | |
676 | ||
677 | /* show the full disk and all non-0 size partitions of it */ | |
1f014290 | 678 | seq_printf(seqf, "%4d %7d %10llu %s\n", |
f331c029 | 679 | MAJOR(disk_devt(sgp)), MINOR(disk_devt(sgp)), |
1da177e4 LT |
680 | (unsigned long long)get_capacity(sgp) >> 1, |
681 | disk_name(sgp, 0, buf)); | |
e71bf0d0 TH |
682 | |
683 | disk_part_iter_init(&piter, sgp, 0); | |
684 | while ((part = disk_part_iter_next(&piter))) | |
1f014290 | 685 | seq_printf(seqf, "%4d %7d %10llu %s\n", |
f331c029 TH |
686 | MAJOR(part_devt(part)), MINOR(part_devt(part)), |
687 | (unsigned long long)part->nr_sects >> 1, | |
688 | disk_name(sgp, part->partno, buf)); | |
e71bf0d0 | 689 | disk_part_iter_exit(&piter); |
1da177e4 LT |
690 | |
691 | return 0; | |
692 | } | |
693 | ||
12f32bb3 | 694 | const struct seq_operations partitions_op = { |
def4e38d TH |
695 | .start = show_partition_start, |
696 | .next = disk_seqf_next, | |
697 | .stop = disk_seqf_stop, | |
edfaa7c3 | 698 | .show = show_partition |
1da177e4 LT |
699 | }; |
700 | #endif | |
701 | ||
702 | ||
cf771cb5 | 703 | static struct kobject *base_probe(dev_t devt, int *partno, void *data) |
1da177e4 | 704 | { |
edfaa7c3 | 705 | if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
1da177e4 | 706 | /* Make old-style 2.4 aliases work */ |
edfaa7c3 | 707 | request_module("block-major-%d", MAJOR(devt)); |
1da177e4 LT |
708 | return NULL; |
709 | } | |
710 | ||
711 | static int __init genhd_device_init(void) | |
712 | { | |
e105b8bf DW |
713 | int error; |
714 | ||
715 | block_class.dev_kobj = sysfs_dev_block_kobj; | |
716 | error = class_register(&block_class); | |
ee27a558 RM |
717 | if (unlikely(error)) |
718 | return error; | |
edfaa7c3 | 719 | bdev_map = kobj_map_init(base_probe, &block_class_lock); |
1da177e4 | 720 | blk_dev_init(); |
edfaa7c3 KS |
721 | |
722 | #ifndef CONFIG_SYSFS_DEPRECATED | |
723 | /* create top-level block dir */ | |
724 | block_depr = kobject_create_and_add("block", NULL); | |
725 | #endif | |
830d3cfb | 726 | return 0; |
1da177e4 LT |
727 | } |
728 | ||
729 | subsys_initcall(genhd_device_init); | |
730 | ||
edfaa7c3 KS |
731 | static ssize_t disk_range_show(struct device *dev, |
732 | struct device_attribute *attr, char *buf) | |
1da177e4 | 733 | { |
edfaa7c3 | 734 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 735 | |
edfaa7c3 | 736 | return sprintf(buf, "%d\n", disk->minors); |
1da177e4 LT |
737 | } |
738 | ||
1f014290 TH |
739 | static ssize_t disk_ext_range_show(struct device *dev, |
740 | struct device_attribute *attr, char *buf) | |
741 | { | |
742 | struct gendisk *disk = dev_to_disk(dev); | |
743 | ||
744 | return sprintf(buf, "%d\n", disk_max_parts(disk) + 1); | |
745 | } | |
746 | ||
edfaa7c3 KS |
747 | static ssize_t disk_removable_show(struct device *dev, |
748 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 749 | { |
edfaa7c3 | 750 | struct gendisk *disk = dev_to_disk(dev); |
a7fd6706 | 751 | |
edfaa7c3 KS |
752 | return sprintf(buf, "%d\n", |
753 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
a7fd6706 KS |
754 | } |
755 | ||
1c9ce527 KS |
756 | static ssize_t disk_ro_show(struct device *dev, |
757 | struct device_attribute *attr, char *buf) | |
758 | { | |
759 | struct gendisk *disk = dev_to_disk(dev); | |
760 | ||
761 | return sprintf(buf, "%d\n", disk->policy ? 1 : 0); | |
762 | } | |
763 | ||
edfaa7c3 KS |
764 | static ssize_t disk_size_show(struct device *dev, |
765 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 766 | { |
edfaa7c3 | 767 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 768 | |
edfaa7c3 | 769 | return sprintf(buf, "%llu\n", (unsigned long long)get_capacity(disk)); |
1da177e4 | 770 | } |
edfaa7c3 KS |
771 | |
772 | static ssize_t disk_capability_show(struct device *dev, | |
773 | struct device_attribute *attr, char *buf) | |
86ce18d7 | 774 | { |
edfaa7c3 KS |
775 | struct gendisk *disk = dev_to_disk(dev); |
776 | ||
777 | return sprintf(buf, "%x\n", disk->flags); | |
86ce18d7 | 778 | } |
edfaa7c3 KS |
779 | |
780 | static ssize_t disk_stat_show(struct device *dev, | |
781 | struct device_attribute *attr, char *buf) | |
1da177e4 | 782 | { |
edfaa7c3 | 783 | struct gendisk *disk = dev_to_disk(dev); |
c9959059 | 784 | int cpu; |
edfaa7c3 | 785 | |
c9959059 TH |
786 | cpu = disk_stat_lock(); |
787 | disk_round_stats(cpu, disk); | |
788 | disk_stat_unlock(); | |
edfaa7c3 | 789 | return sprintf(buf, |
837c7878 BW |
790 | "%8lu %8lu %8llu %8u " |
791 | "%8lu %8lu %8llu %8u " | |
1da177e4 LT |
792 | "%8u %8u %8u" |
793 | "\n", | |
47a00410 JA |
794 | disk_stat_read(disk, ios[READ]), |
795 | disk_stat_read(disk, merges[READ]), | |
796 | (unsigned long long)disk_stat_read(disk, sectors[READ]), | |
797 | jiffies_to_msecs(disk_stat_read(disk, ticks[READ])), | |
798 | disk_stat_read(disk, ios[WRITE]), | |
799 | disk_stat_read(disk, merges[WRITE]), | |
800 | (unsigned long long)disk_stat_read(disk, sectors[WRITE]), | |
801 | jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])), | |
1da177e4 LT |
802 | disk->in_flight, |
803 | jiffies_to_msecs(disk_stat_read(disk, io_ticks)), | |
804 | jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); | |
805 | } | |
1da177e4 | 806 | |
c17bb495 | 807 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
808 | static ssize_t disk_fail_show(struct device *dev, |
809 | struct device_attribute *attr, char *buf) | |
810 | { | |
811 | struct gendisk *disk = dev_to_disk(dev); | |
812 | ||
813 | return sprintf(buf, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0); | |
814 | } | |
c17bb495 | 815 | |
edfaa7c3 KS |
816 | static ssize_t disk_fail_store(struct device *dev, |
817 | struct device_attribute *attr, | |
c17bb495 AM |
818 | const char *buf, size_t count) |
819 | { | |
edfaa7c3 | 820 | struct gendisk *disk = dev_to_disk(dev); |
c17bb495 AM |
821 | int i; |
822 | ||
823 | if (count > 0 && sscanf(buf, "%d", &i) > 0) { | |
824 | if (i == 0) | |
825 | disk->flags &= ~GENHD_FL_FAIL; | |
826 | else | |
827 | disk->flags |= GENHD_FL_FAIL; | |
828 | } | |
829 | ||
830 | return count; | |
831 | } | |
c17bb495 AM |
832 | |
833 | #endif | |
834 | ||
edfaa7c3 | 835 | static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); |
1f014290 | 836 | static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL); |
edfaa7c3 | 837 | static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); |
1c9ce527 | 838 | static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); |
edfaa7c3 KS |
839 | static DEVICE_ATTR(size, S_IRUGO, disk_size_show, NULL); |
840 | static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); | |
841 | static DEVICE_ATTR(stat, S_IRUGO, disk_stat_show, NULL); | |
c17bb495 | 842 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
843 | static struct device_attribute dev_attr_fail = |
844 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, disk_fail_show, disk_fail_store); | |
c17bb495 | 845 | #endif |
edfaa7c3 KS |
846 | |
847 | static struct attribute *disk_attrs[] = { | |
848 | &dev_attr_range.attr, | |
1f014290 | 849 | &dev_attr_ext_range.attr, |
edfaa7c3 | 850 | &dev_attr_removable.attr, |
1c9ce527 | 851 | &dev_attr_ro.attr, |
edfaa7c3 KS |
852 | &dev_attr_size.attr, |
853 | &dev_attr_capability.attr, | |
854 | &dev_attr_stat.attr, | |
855 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
856 | &dev_attr_fail.attr, | |
857 | #endif | |
858 | NULL | |
859 | }; | |
860 | ||
861 | static struct attribute_group disk_attr_group = { | |
862 | .attrs = disk_attrs, | |
863 | }; | |
864 | ||
865 | static struct attribute_group *disk_attr_groups[] = { | |
866 | &disk_attr_group, | |
867 | NULL | |
1da177e4 LT |
868 | }; |
869 | ||
edfaa7c3 | 870 | static void disk_release(struct device *dev) |
1da177e4 | 871 | { |
edfaa7c3 KS |
872 | struct gendisk *disk = dev_to_disk(dev); |
873 | ||
1da177e4 | 874 | kfree(disk->random); |
e71bf0d0 | 875 | kfree(disk->__part); |
1da177e4 LT |
876 | free_disk_stats(disk); |
877 | kfree(disk); | |
878 | } | |
edfaa7c3 KS |
879 | struct class block_class = { |
880 | .name = "block", | |
1da177e4 LT |
881 | }; |
882 | ||
1826eadf | 883 | static struct device_type disk_type = { |
edfaa7c3 KS |
884 | .name = "disk", |
885 | .groups = disk_attr_groups, | |
886 | .release = disk_release, | |
1da177e4 LT |
887 | }; |
888 | ||
a6e2ba88 | 889 | #ifdef CONFIG_PROC_FS |
cf771cb5 TH |
890 | /* |
891 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
892 | * entries do, above, but makes them available through one seq_file. | |
893 | * | |
894 | * The output looks suspiciously like /proc/partitions with a bunch of | |
895 | * extra fields. | |
896 | */ | |
897 | static int diskstats_show(struct seq_file *seqf, void *v) | |
1da177e4 LT |
898 | { |
899 | struct gendisk *gp = v; | |
e71bf0d0 TH |
900 | struct disk_part_iter piter; |
901 | struct hd_struct *hd; | |
1da177e4 | 902 | char buf[BDEVNAME_SIZE]; |
c9959059 | 903 | int cpu; |
1da177e4 LT |
904 | |
905 | /* | |
edfaa7c3 | 906 | if (&gp->dev.kobj.entry == block_class.devices.next) |
cf771cb5 | 907 | seq_puts(seqf, "major minor name" |
1da177e4 LT |
908 | " rio rmerge rsect ruse wio wmerge " |
909 | "wsect wuse running use aveq" | |
910 | "\n\n"); | |
911 | */ | |
912 | ||
c9959059 TH |
913 | cpu = disk_stat_lock(); |
914 | disk_round_stats(cpu, gp); | |
915 | disk_stat_unlock(); | |
1f014290 | 916 | seq_printf(seqf, "%4d %7d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n", |
f331c029 TH |
917 | MAJOR(disk_devt(gp)), MINOR(disk_devt(gp)), |
918 | disk_name(gp, 0, buf), | |
a362357b JA |
919 | disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), |
920 | (unsigned long long)disk_stat_read(gp, sectors[0]), | |
921 | jiffies_to_msecs(disk_stat_read(gp, ticks[0])), | |
922 | disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]), | |
923 | (unsigned long long)disk_stat_read(gp, sectors[1]), | |
924 | jiffies_to_msecs(disk_stat_read(gp, ticks[1])), | |
1da177e4 LT |
925 | gp->in_flight, |
926 | jiffies_to_msecs(disk_stat_read(gp, io_ticks)), | |
927 | jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); | |
928 | ||
929 | /* now show all non-0 size partitions of it */ | |
e71bf0d0 TH |
930 | disk_part_iter_init(&piter, gp, 0); |
931 | while ((hd = disk_part_iter_next(&piter))) { | |
c9959059 TH |
932 | cpu = disk_stat_lock(); |
933 | part_round_stats(cpu, hd); | |
934 | disk_stat_unlock(); | |
1f014290 | 935 | seq_printf(seqf, "%4d %7d %s %lu %lu %llu " |
28f39d55 | 936 | "%u %lu %lu %llu %u %u %u %u\n", |
f331c029 TH |
937 | MAJOR(part_devt(hd)), MINOR(part_devt(hd)), |
938 | disk_name(gp, hd->partno, buf), | |
28f39d55 JM |
939 | part_stat_read(hd, ios[0]), |
940 | part_stat_read(hd, merges[0]), | |
941 | (unsigned long long)part_stat_read(hd, sectors[0]), | |
942 | jiffies_to_msecs(part_stat_read(hd, ticks[0])), | |
943 | part_stat_read(hd, ios[1]), | |
944 | part_stat_read(hd, merges[1]), | |
945 | (unsigned long long)part_stat_read(hd, sectors[1]), | |
946 | jiffies_to_msecs(part_stat_read(hd, ticks[1])), | |
947 | hd->in_flight, | |
948 | jiffies_to_msecs(part_stat_read(hd, io_ticks)), | |
949 | jiffies_to_msecs(part_stat_read(hd, time_in_queue)) | |
950 | ); | |
1da177e4 | 951 | } |
e71bf0d0 | 952 | disk_part_iter_exit(&piter); |
1da177e4 LT |
953 | |
954 | return 0; | |
955 | } | |
956 | ||
12f32bb3 | 957 | const struct seq_operations diskstats_op = { |
def4e38d TH |
958 | .start = disk_seqf_start, |
959 | .next = disk_seqf_next, | |
960 | .stop = disk_seqf_stop, | |
1da177e4 LT |
961 | .show = diskstats_show |
962 | }; | |
a6e2ba88 | 963 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 964 | |
8ce7ad7b KCA |
965 | static void media_change_notify_thread(struct work_struct *work) |
966 | { | |
967 | struct gendisk *gd = container_of(work, struct gendisk, async_notify); | |
968 | char event[] = "MEDIA_CHANGE=1"; | |
969 | char *envp[] = { event, NULL }; | |
970 | ||
971 | /* | |
972 | * set enviroment vars to indicate which event this is for | |
973 | * so that user space will know to go check the media status. | |
974 | */ | |
edfaa7c3 | 975 | kobject_uevent_env(&gd->dev.kobj, KOBJ_CHANGE, envp); |
8ce7ad7b KCA |
976 | put_device(gd->driverfs_dev); |
977 | } | |
978 | ||
1826eadf | 979 | #if 0 |
8ce7ad7b KCA |
980 | void genhd_media_change_notify(struct gendisk *disk) |
981 | { | |
982 | get_device(disk->driverfs_dev); | |
983 | schedule_work(&disk->async_notify); | |
984 | } | |
985 | EXPORT_SYMBOL_GPL(genhd_media_change_notify); | |
1826eadf | 986 | #endif /* 0 */ |
8ce7ad7b | 987 | |
cf771cb5 | 988 | dev_t blk_lookup_devt(const char *name, int partno) |
a142be85 | 989 | { |
def4e38d TH |
990 | dev_t devt = MKDEV(0, 0); |
991 | struct class_dev_iter iter; | |
992 | struct device *dev; | |
a142be85 | 993 | |
def4e38d TH |
994 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); |
995 | while ((dev = class_dev_iter_next(&iter))) { | |
a142be85 | 996 | struct gendisk *disk = dev_to_disk(dev); |
a142be85 | 997 | |
f331c029 TH |
998 | if (strcmp(dev->bus_id, name)) |
999 | continue; | |
1000 | if (partno < 0 || partno > disk_max_parts(disk)) | |
1001 | continue; | |
1002 | ||
1003 | if (partno == 0) | |
1004 | devt = disk_devt(disk); | |
1005 | else { | |
e71bf0d0 | 1006 | struct hd_struct *part; |
f331c029 | 1007 | |
e71bf0d0 TH |
1008 | part = disk_get_part(disk, partno); |
1009 | if (!part || !part->nr_sects) { | |
1010 | disk_put_part(part); | |
f331c029 | 1011 | continue; |
e71bf0d0 | 1012 | } |
f331c029 TH |
1013 | |
1014 | devt = part_devt(part); | |
e71bf0d0 | 1015 | disk_put_part(part); |
def4e38d | 1016 | } |
f331c029 | 1017 | break; |
5c0ef6d0 | 1018 | } |
def4e38d | 1019 | class_dev_iter_exit(&iter); |
edfaa7c3 KS |
1020 | return devt; |
1021 | } | |
edfaa7c3 KS |
1022 | EXPORT_SYMBOL(blk_lookup_devt); |
1023 | ||
1da177e4 LT |
1024 | struct gendisk *alloc_disk(int minors) |
1025 | { | |
1946089a CL |
1026 | return alloc_disk_node(minors, -1); |
1027 | } | |
1028 | ||
1029 | struct gendisk *alloc_disk_node(int minors, int node_id) | |
bcce3de1 TH |
1030 | { |
1031 | return alloc_disk_ext_node(minors, 0, node_id); | |
1032 | } | |
1033 | ||
1034 | struct gendisk *alloc_disk_ext(int minors, int ext_minors) | |
1035 | { | |
1036 | return alloc_disk_ext_node(minors, ext_minors, -1); | |
1037 | } | |
1038 | ||
1039 | struct gendisk *alloc_disk_ext_node(int minors, int ext_minors, int node_id) | |
1946089a CL |
1040 | { |
1041 | struct gendisk *disk; | |
1042 | ||
94f6030c CL |
1043 | disk = kmalloc_node(sizeof(struct gendisk), |
1044 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 1045 | if (disk) { |
bcce3de1 TH |
1046 | int tot_minors = minors + ext_minors; |
1047 | ||
1da177e4 LT |
1048 | if (!init_disk_stats(disk)) { |
1049 | kfree(disk); | |
1050 | return NULL; | |
1051 | } | |
bcce3de1 TH |
1052 | if (tot_minors > 1) { |
1053 | int size = (tot_minors - 1) * sizeof(struct hd_struct *); | |
e71bf0d0 | 1054 | disk->__part = kmalloc_node(size, |
94f6030c | 1055 | GFP_KERNEL | __GFP_ZERO, node_id); |
e71bf0d0 | 1056 | if (!disk->__part) { |
c7674030 | 1057 | free_disk_stats(disk); |
1da177e4 LT |
1058 | kfree(disk); |
1059 | return NULL; | |
1060 | } | |
1da177e4 LT |
1061 | } |
1062 | disk->minors = minors; | |
bcce3de1 | 1063 | disk->ext_minors = ext_minors; |
1da177e4 | 1064 | rand_initialize_disk(disk); |
edfaa7c3 KS |
1065 | disk->dev.class = &block_class; |
1066 | disk->dev.type = &disk_type; | |
1067 | device_initialize(&disk->dev); | |
8ce7ad7b KCA |
1068 | INIT_WORK(&disk->async_notify, |
1069 | media_change_notify_thread); | |
1da177e4 LT |
1070 | } |
1071 | return disk; | |
1072 | } | |
1073 | ||
1074 | EXPORT_SYMBOL(alloc_disk); | |
1946089a | 1075 | EXPORT_SYMBOL(alloc_disk_node); |
bcce3de1 TH |
1076 | EXPORT_SYMBOL(alloc_disk_ext); |
1077 | EXPORT_SYMBOL(alloc_disk_ext_node); | |
1da177e4 LT |
1078 | |
1079 | struct kobject *get_disk(struct gendisk *disk) | |
1080 | { | |
1081 | struct module *owner; | |
1082 | struct kobject *kobj; | |
1083 | ||
1084 | if (!disk->fops) | |
1085 | return NULL; | |
1086 | owner = disk->fops->owner; | |
1087 | if (owner && !try_module_get(owner)) | |
1088 | return NULL; | |
edfaa7c3 | 1089 | kobj = kobject_get(&disk->dev.kobj); |
1da177e4 LT |
1090 | if (kobj == NULL) { |
1091 | module_put(owner); | |
1092 | return NULL; | |
1093 | } | |
1094 | return kobj; | |
1095 | ||
1096 | } | |
1097 | ||
1098 | EXPORT_SYMBOL(get_disk); | |
1099 | ||
1100 | void put_disk(struct gendisk *disk) | |
1101 | { | |
1102 | if (disk) | |
edfaa7c3 | 1103 | kobject_put(&disk->dev.kobj); |
1da177e4 LT |
1104 | } |
1105 | ||
1106 | EXPORT_SYMBOL(put_disk); | |
1107 | ||
1108 | void set_device_ro(struct block_device *bdev, int flag) | |
1109 | { | |
1110 | if (bdev->bd_contains != bdev) | |
1111 | bdev->bd_part->policy = flag; | |
1112 | else | |
1113 | bdev->bd_disk->policy = flag; | |
1114 | } | |
1115 | ||
1116 | EXPORT_SYMBOL(set_device_ro); | |
1117 | ||
1118 | void set_disk_ro(struct gendisk *disk, int flag) | |
1119 | { | |
e71bf0d0 TH |
1120 | struct disk_part_iter piter; |
1121 | struct hd_struct *part; | |
1122 | ||
1da177e4 | 1123 | disk->policy = flag; |
e71bf0d0 TH |
1124 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); |
1125 | while ((part = disk_part_iter_next(&piter))) | |
1126 | part->policy = flag; | |
1127 | disk_part_iter_exit(&piter); | |
1da177e4 LT |
1128 | } |
1129 | ||
1130 | EXPORT_SYMBOL(set_disk_ro); | |
1131 | ||
1132 | int bdev_read_only(struct block_device *bdev) | |
1133 | { | |
1134 | if (!bdev) | |
1135 | return 0; | |
1136 | else if (bdev->bd_contains != bdev) | |
1137 | return bdev->bd_part->policy; | |
1138 | else | |
1139 | return bdev->bd_disk->policy; | |
1140 | } | |
1141 | ||
1142 | EXPORT_SYMBOL(bdev_read_only); | |
1143 | ||
cf771cb5 | 1144 | int invalidate_partition(struct gendisk *disk, int partno) |
1da177e4 LT |
1145 | { |
1146 | int res = 0; | |
cf771cb5 | 1147 | struct block_device *bdev = bdget_disk(disk, partno); |
1da177e4 | 1148 | if (bdev) { |
2ef41634 CH |
1149 | fsync_bdev(bdev); |
1150 | res = __invalidate_device(bdev); | |
1da177e4 LT |
1151 | bdput(bdev); |
1152 | } | |
1153 | return res; | |
1154 | } | |
1155 | ||
1156 | EXPORT_SYMBOL(invalidate_partition); |