Commit | Line | Data |
---|---|---|
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 | ||
b5d0b9df | 57 | if (unlikely(partno < 0 || partno >= disk_max_parts(disk))) |
e71bf0d0 TH |
58 | return NULL; |
59 | rcu_read_lock(); | |
b5d0b9df | 60 | part = rcu_dereference(disk->__part[partno]); |
e71bf0d0 | 61 | if (part) |
ed9e1982 | 62 | get_device(part_to_dev(part)); |
e71bf0d0 TH |
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; | |
b5d0b9df | 88 | else if (flags & DISK_PITER_INCL_PART0) |
e71bf0d0 | 89 | piter->idx = 0; |
b5d0b9df TH |
90 | else |
91 | piter->idx = 1; | |
e71bf0d0 TH |
92 | |
93 | piter->flags = flags; | |
94 | } | |
95 | EXPORT_SYMBOL_GPL(disk_part_iter_init); | |
96 | ||
97 | /** | |
98 | * disk_part_iter_next - proceed iterator to the next partition and return it | |
99 | * @piter: iterator of interest | |
100 | * | |
101 | * Proceed @piter to the next partition and return it. | |
102 | * | |
103 | * CONTEXT: | |
104 | * Don't care. | |
105 | */ | |
106 | struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter) | |
107 | { | |
108 | int inc, end; | |
109 | ||
110 | /* put the last partition */ | |
111 | disk_put_part(piter->part); | |
112 | piter->part = NULL; | |
113 | ||
114 | rcu_read_lock(); | |
115 | ||
116 | /* determine iteration parameters */ | |
117 | if (piter->flags & DISK_PITER_REVERSE) { | |
118 | inc = -1; | |
b5d0b9df TH |
119 | if (piter->flags & DISK_PITER_INCL_PART0) |
120 | end = -1; | |
121 | else | |
122 | end = 0; | |
e71bf0d0 TH |
123 | } else { |
124 | inc = 1; | |
125 | end = disk_max_parts(piter->disk); | |
126 | } | |
127 | ||
128 | /* iterate to the next partition */ | |
129 | for (; piter->idx != end; piter->idx += inc) { | |
130 | struct hd_struct *part; | |
131 | ||
132 | part = rcu_dereference(piter->disk->__part[piter->idx]); | |
133 | if (!part) | |
134 | continue; | |
135 | if (!(piter->flags & DISK_PITER_INCL_EMPTY) && !part->nr_sects) | |
136 | continue; | |
137 | ||
ed9e1982 | 138 | get_device(part_to_dev(part)); |
e71bf0d0 TH |
139 | piter->part = part; |
140 | piter->idx += inc; | |
141 | break; | |
142 | } | |
143 | ||
144 | rcu_read_unlock(); | |
145 | ||
146 | return piter->part; | |
147 | } | |
148 | EXPORT_SYMBOL_GPL(disk_part_iter_next); | |
149 | ||
150 | /** | |
151 | * disk_part_iter_exit - finish up partition iteration | |
152 | * @piter: iter of interest | |
153 | * | |
154 | * Called when iteration is over. Cleans up @piter. | |
155 | * | |
156 | * CONTEXT: | |
157 | * Don't care. | |
158 | */ | |
159 | void disk_part_iter_exit(struct disk_part_iter *piter) | |
160 | { | |
161 | disk_put_part(piter->part); | |
162 | piter->part = NULL; | |
163 | } | |
164 | EXPORT_SYMBOL_GPL(disk_part_iter_exit); | |
165 | ||
166 | /** | |
167 | * disk_map_sector_rcu - map sector to partition | |
168 | * @disk: gendisk of interest | |
169 | * @sector: sector to map | |
170 | * | |
171 | * Find out which partition @sector maps to on @disk. This is | |
172 | * primarily used for stats accounting. | |
173 | * | |
174 | * CONTEXT: | |
175 | * RCU read locked. The returned partition pointer is valid only | |
176 | * while preemption is disabled. | |
177 | * | |
178 | * RETURNS: | |
179 | * Found partition on success, NULL if there's no matching partition. | |
180 | */ | |
181 | struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) | |
182 | { | |
183 | int i; | |
184 | ||
b5d0b9df | 185 | for (i = 1; i < disk_max_parts(disk); i++) { |
e71bf0d0 TH |
186 | struct hd_struct *part = rcu_dereference(disk->__part[i]); |
187 | ||
188 | if (part && part->start_sect <= sector && | |
189 | sector < part->start_sect + part->nr_sects) | |
190 | return part; | |
191 | } | |
192 | return NULL; | |
193 | } | |
194 | EXPORT_SYMBOL_GPL(disk_map_sector_rcu); | |
195 | ||
1da177e4 LT |
196 | /* |
197 | * Can be deleted altogether. Later. | |
198 | * | |
199 | */ | |
200 | static struct blk_major_name { | |
201 | struct blk_major_name *next; | |
202 | int major; | |
203 | char name[16]; | |
68eef3b4 | 204 | } *major_names[BLKDEV_MAJOR_HASH_SIZE]; |
1da177e4 LT |
205 | |
206 | /* index in the above - for now: assume no multimajor ranges */ | |
207 | static inline int major_to_index(int major) | |
208 | { | |
68eef3b4 | 209 | return major % BLKDEV_MAJOR_HASH_SIZE; |
7170be5f NH |
210 | } |
211 | ||
68eef3b4 | 212 | #ifdef CONFIG_PROC_FS |
cf771cb5 | 213 | void blkdev_show(struct seq_file *seqf, off_t offset) |
7170be5f | 214 | { |
68eef3b4 | 215 | struct blk_major_name *dp; |
7170be5f | 216 | |
68eef3b4 | 217 | if (offset < BLKDEV_MAJOR_HASH_SIZE) { |
edfaa7c3 | 218 | mutex_lock(&block_class_lock); |
68eef3b4 | 219 | for (dp = major_names[offset]; dp; dp = dp->next) |
cf771cb5 | 220 | seq_printf(seqf, "%3d %s\n", dp->major, dp->name); |
edfaa7c3 | 221 | mutex_unlock(&block_class_lock); |
1da177e4 | 222 | } |
1da177e4 | 223 | } |
68eef3b4 | 224 | #endif /* CONFIG_PROC_FS */ |
1da177e4 LT |
225 | |
226 | int register_blkdev(unsigned int major, const char *name) | |
227 | { | |
228 | struct blk_major_name **n, *p; | |
229 | int index, ret = 0; | |
230 | ||
edfaa7c3 | 231 | mutex_lock(&block_class_lock); |
1da177e4 LT |
232 | |
233 | /* temporary */ | |
234 | if (major == 0) { | |
235 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { | |
236 | if (major_names[index] == NULL) | |
237 | break; | |
238 | } | |
239 | ||
240 | if (index == 0) { | |
241 | printk("register_blkdev: failed to get major for %s\n", | |
242 | name); | |
243 | ret = -EBUSY; | |
244 | goto out; | |
245 | } | |
246 | major = index; | |
247 | ret = major; | |
248 | } | |
249 | ||
250 | p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); | |
251 | if (p == NULL) { | |
252 | ret = -ENOMEM; | |
253 | goto out; | |
254 | } | |
255 | ||
256 | p->major = major; | |
257 | strlcpy(p->name, name, sizeof(p->name)); | |
258 | p->next = NULL; | |
259 | index = major_to_index(major); | |
260 | ||
261 | for (n = &major_names[index]; *n; n = &(*n)->next) { | |
262 | if ((*n)->major == major) | |
263 | break; | |
264 | } | |
265 | if (!*n) | |
266 | *n = p; | |
267 | else | |
268 | ret = -EBUSY; | |
269 | ||
270 | if (ret < 0) { | |
271 | printk("register_blkdev: cannot get major %d for %s\n", | |
272 | major, name); | |
273 | kfree(p); | |
274 | } | |
275 | out: | |
edfaa7c3 | 276 | mutex_unlock(&block_class_lock); |
1da177e4 LT |
277 | return ret; |
278 | } | |
279 | ||
280 | EXPORT_SYMBOL(register_blkdev); | |
281 | ||
f4480240 | 282 | void unregister_blkdev(unsigned int major, const char *name) |
1da177e4 LT |
283 | { |
284 | struct blk_major_name **n; | |
285 | struct blk_major_name *p = NULL; | |
286 | int index = major_to_index(major); | |
1da177e4 | 287 | |
edfaa7c3 | 288 | mutex_lock(&block_class_lock); |
1da177e4 LT |
289 | for (n = &major_names[index]; *n; n = &(*n)->next) |
290 | if ((*n)->major == major) | |
291 | break; | |
294462a5 AM |
292 | if (!*n || strcmp((*n)->name, name)) { |
293 | WARN_ON(1); | |
294462a5 | 294 | } else { |
1da177e4 LT |
295 | p = *n; |
296 | *n = p->next; | |
297 | } | |
edfaa7c3 | 298 | mutex_unlock(&block_class_lock); |
1da177e4 | 299 | kfree(p); |
1da177e4 LT |
300 | } |
301 | ||
302 | EXPORT_SYMBOL(unregister_blkdev); | |
303 | ||
304 | static struct kobj_map *bdev_map; | |
305 | ||
870d6656 TH |
306 | /** |
307 | * blk_mangle_minor - scatter minor numbers apart | |
308 | * @minor: minor number to mangle | |
309 | * | |
310 | * Scatter consecutively allocated @minor number apart if MANGLE_DEVT | |
311 | * is enabled. Mangling twice gives the original value. | |
312 | * | |
313 | * RETURNS: | |
314 | * Mangled value. | |
315 | * | |
316 | * CONTEXT: | |
317 | * Don't care. | |
318 | */ | |
319 | static int blk_mangle_minor(int minor) | |
320 | { | |
321 | #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT | |
322 | int i; | |
323 | ||
324 | for (i = 0; i < MINORBITS / 2; i++) { | |
325 | int low = minor & (1 << i); | |
326 | int high = minor & (1 << (MINORBITS - 1 - i)); | |
327 | int distance = MINORBITS - 1 - 2 * i; | |
328 | ||
329 | minor ^= low | high; /* clear both bits */ | |
330 | low <<= distance; /* swap the positions */ | |
331 | high >>= distance; | |
332 | minor |= low | high; /* and set */ | |
333 | } | |
334 | #endif | |
335 | return minor; | |
336 | } | |
337 | ||
bcce3de1 TH |
338 | /** |
339 | * blk_alloc_devt - allocate a dev_t for a partition | |
340 | * @part: partition to allocate dev_t for | |
341 | * @gfp_mask: memory allocation flag | |
342 | * @devt: out parameter for resulting dev_t | |
343 | * | |
344 | * Allocate a dev_t for block device. | |
345 | * | |
346 | * RETURNS: | |
347 | * 0 on success, allocated dev_t is returned in *@devt. -errno on | |
348 | * failure. | |
349 | * | |
350 | * CONTEXT: | |
351 | * Might sleep. | |
352 | */ | |
353 | int blk_alloc_devt(struct hd_struct *part, dev_t *devt) | |
354 | { | |
355 | struct gendisk *disk = part_to_disk(part); | |
356 | int idx, rc; | |
357 | ||
358 | /* in consecutive minor range? */ | |
359 | if (part->partno < disk->minors) { | |
360 | *devt = MKDEV(disk->major, disk->first_minor + part->partno); | |
361 | return 0; | |
362 | } | |
363 | ||
364 | /* allocate ext devt */ | |
365 | do { | |
366 | if (!idr_pre_get(&ext_devt_idr, GFP_KERNEL)) | |
367 | return -ENOMEM; | |
368 | rc = idr_get_new(&ext_devt_idr, part, &idx); | |
369 | } while (rc == -EAGAIN); | |
370 | ||
371 | if (rc) | |
372 | return rc; | |
373 | ||
374 | if (idx > MAX_EXT_DEVT) { | |
375 | idr_remove(&ext_devt_idr, idx); | |
376 | return -EBUSY; | |
377 | } | |
378 | ||
870d6656 | 379 | *devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx)); |
bcce3de1 TH |
380 | return 0; |
381 | } | |
382 | ||
383 | /** | |
384 | * blk_free_devt - free a dev_t | |
385 | * @devt: dev_t to free | |
386 | * | |
387 | * Free @devt which was allocated using blk_alloc_devt(). | |
388 | * | |
389 | * CONTEXT: | |
390 | * Might sleep. | |
391 | */ | |
392 | void blk_free_devt(dev_t devt) | |
393 | { | |
394 | might_sleep(); | |
395 | ||
396 | if (devt == MKDEV(0, 0)) | |
397 | return; | |
398 | ||
399 | if (MAJOR(devt) == BLOCK_EXT_MAJOR) { | |
400 | mutex_lock(&ext_devt_mutex); | |
870d6656 | 401 | idr_remove(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
bcce3de1 TH |
402 | mutex_unlock(&ext_devt_mutex); |
403 | } | |
404 | } | |
405 | ||
1f014290 TH |
406 | static char *bdevt_str(dev_t devt, char *buf) |
407 | { | |
408 | if (MAJOR(devt) <= 0xff && MINOR(devt) <= 0xff) { | |
409 | char tbuf[BDEVT_SIZE]; | |
410 | snprintf(tbuf, BDEVT_SIZE, "%02x%02x", MAJOR(devt), MINOR(devt)); | |
411 | snprintf(buf, BDEVT_SIZE, "%-9s", tbuf); | |
412 | } else | |
413 | snprintf(buf, BDEVT_SIZE, "%03x:%05x", MAJOR(devt), MINOR(devt)); | |
414 | ||
415 | return buf; | |
416 | } | |
417 | ||
1da177e4 LT |
418 | /* |
419 | * Register device numbers dev..(dev+range-1) | |
420 | * range must be nonzero | |
421 | * The hash chain is sorted on range, so that subranges can override. | |
422 | */ | |
edfaa7c3 | 423 | void blk_register_region(dev_t devt, unsigned long range, struct module *module, |
1da177e4 LT |
424 | struct kobject *(*probe)(dev_t, int *, void *), |
425 | int (*lock)(dev_t, void *), void *data) | |
426 | { | |
edfaa7c3 | 427 | kobj_map(bdev_map, devt, range, module, probe, lock, data); |
1da177e4 LT |
428 | } |
429 | ||
430 | EXPORT_SYMBOL(blk_register_region); | |
431 | ||
edfaa7c3 | 432 | void blk_unregister_region(dev_t devt, unsigned long range) |
1da177e4 | 433 | { |
edfaa7c3 | 434 | kobj_unmap(bdev_map, devt, range); |
1da177e4 LT |
435 | } |
436 | ||
437 | EXPORT_SYMBOL(blk_unregister_region); | |
438 | ||
cf771cb5 | 439 | static struct kobject *exact_match(dev_t devt, int *partno, void *data) |
1da177e4 LT |
440 | { |
441 | struct gendisk *p = data; | |
edfaa7c3 | 442 | |
ed9e1982 | 443 | return &disk_to_dev(p)->kobj; |
1da177e4 LT |
444 | } |
445 | ||
edfaa7c3 | 446 | static int exact_lock(dev_t devt, void *data) |
1da177e4 LT |
447 | { |
448 | struct gendisk *p = data; | |
449 | ||
450 | if (!get_disk(p)) | |
451 | return -1; | |
452 | return 0; | |
453 | } | |
454 | ||
455 | /** | |
456 | * add_disk - add partitioning information to kernel list | |
457 | * @disk: per-device partitioning information | |
458 | * | |
459 | * This function registers the partitioning information in @disk | |
460 | * with the kernel. | |
461 | */ | |
462 | void add_disk(struct gendisk *disk) | |
463 | { | |
cf0ca9fe | 464 | struct backing_dev_info *bdi; |
6ffeea77 | 465 | int retval; |
cf0ca9fe | 466 | |
1da177e4 | 467 | disk->flags |= GENHD_FL_UP; |
ed9e1982 | 468 | disk_to_dev(disk)->devt = MKDEV(disk->major, disk->first_minor); |
f331c029 TH |
469 | blk_register_region(disk_devt(disk), disk->minors, NULL, |
470 | exact_match, exact_lock, disk); | |
1da177e4 LT |
471 | register_disk(disk); |
472 | blk_register_queue(disk); | |
cf0ca9fe PZ |
473 | |
474 | bdi = &disk->queue->backing_dev_info; | |
f331c029 | 475 | bdi_register_dev(bdi, disk_devt(disk)); |
ed9e1982 TH |
476 | retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj, |
477 | "bdi"); | |
6ffeea77 | 478 | WARN_ON(retval); |
1da177e4 LT |
479 | } |
480 | ||
481 | EXPORT_SYMBOL(add_disk); | |
482 | EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ | |
483 | ||
484 | void unlink_gendisk(struct gendisk *disk) | |
485 | { | |
ed9e1982 | 486 | sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); |
cf0ca9fe | 487 | bdi_unregister(&disk->queue->backing_dev_info); |
1da177e4 | 488 | blk_unregister_queue(disk); |
f331c029 | 489 | blk_unregister_region(disk_devt(disk), disk->minors); |
1da177e4 LT |
490 | } |
491 | ||
1da177e4 LT |
492 | /** |
493 | * get_gendisk - get partitioning information for a given device | |
710027a4 RD |
494 | * @devt: device to get partitioning information for |
495 | * @part: returned partition index | |
1da177e4 LT |
496 | * |
497 | * This function gets the structure containing partitioning | |
710027a4 | 498 | * information for the given device @devt. |
1da177e4 | 499 | */ |
cf771cb5 | 500 | struct gendisk *get_gendisk(dev_t devt, int *partno) |
1da177e4 | 501 | { |
bcce3de1 TH |
502 | struct gendisk *disk = NULL; |
503 | ||
504 | if (MAJOR(devt) != BLOCK_EXT_MAJOR) { | |
505 | struct kobject *kobj; | |
506 | ||
507 | kobj = kobj_lookup(bdev_map, devt, partno); | |
508 | if (kobj) | |
509 | disk = dev_to_disk(kobj_to_dev(kobj)); | |
510 | } else { | |
511 | struct hd_struct *part; | |
512 | ||
513 | mutex_lock(&ext_devt_mutex); | |
870d6656 | 514 | part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
bcce3de1 TH |
515 | if (part && get_disk(part_to_disk(part))) { |
516 | *partno = part->partno; | |
517 | disk = part_to_disk(part); | |
518 | } | |
519 | mutex_unlock(&ext_devt_mutex); | |
520 | } | |
edfaa7c3 | 521 | |
bcce3de1 | 522 | return disk; |
1da177e4 LT |
523 | } |
524 | ||
f331c029 TH |
525 | /** |
526 | * bdget_disk - do bdget() by gendisk and partition number | |
527 | * @disk: gendisk of interest | |
528 | * @partno: partition number | |
529 | * | |
530 | * Find partition @partno from @disk, do bdget() on it. | |
531 | * | |
532 | * CONTEXT: | |
533 | * Don't care. | |
534 | * | |
535 | * RETURNS: | |
536 | * Resulting block_device on success, NULL on failure. | |
537 | */ | |
538 | extern struct block_device *bdget_disk(struct gendisk *disk, int partno) | |
539 | { | |
540 | dev_t devt = MKDEV(0, 0); | |
541 | ||
542 | if (partno == 0) | |
543 | devt = disk_devt(disk); | |
544 | else { | |
e71bf0d0 | 545 | struct hd_struct *part; |
f331c029 | 546 | |
e71bf0d0 | 547 | part = disk_get_part(disk, partno); |
f331c029 TH |
548 | if (part && part->nr_sects) |
549 | devt = part_devt(part); | |
e71bf0d0 | 550 | disk_put_part(part); |
f331c029 TH |
551 | } |
552 | ||
553 | if (likely(devt != MKDEV(0, 0))) | |
554 | return bdget(devt); | |
555 | return NULL; | |
556 | } | |
557 | EXPORT_SYMBOL(bdget_disk); | |
558 | ||
5c6f35c5 GKH |
559 | /* |
560 | * print a full list of all partitions - intended for places where the root | |
561 | * filesystem can't be mounted and thus to give the victim some idea of what | |
562 | * went wrong | |
563 | */ | |
564 | void __init printk_all_partitions(void) | |
565 | { | |
def4e38d TH |
566 | struct class_dev_iter iter; |
567 | struct device *dev; | |
568 | ||
569 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); | |
570 | while ((dev = class_dev_iter_next(&iter))) { | |
571 | struct gendisk *disk = dev_to_disk(dev); | |
e71bf0d0 TH |
572 | struct disk_part_iter piter; |
573 | struct hd_struct *part; | |
1f014290 TH |
574 | char name_buf[BDEVNAME_SIZE]; |
575 | char devt_buf[BDEVT_SIZE]; | |
def4e38d TH |
576 | |
577 | /* | |
578 | * Don't show empty devices or things that have been | |
579 | * surpressed | |
580 | */ | |
581 | if (get_capacity(disk) == 0 || | |
582 | (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) | |
583 | continue; | |
584 | ||
585 | /* | |
586 | * Note, unlike /proc/partitions, I am showing the | |
587 | * numbers in hex - the same format as the root= | |
588 | * option takes. | |
589 | */ | |
1f014290 TH |
590 | printk("%s %10llu %s", |
591 | bdevt_str(disk_devt(disk), devt_buf), | |
def4e38d | 592 | (unsigned long long)get_capacity(disk) >> 1, |
1f014290 | 593 | disk_name(disk, 0, name_buf)); |
def4e38d TH |
594 | if (disk->driverfs_dev != NULL && |
595 | disk->driverfs_dev->driver != NULL) | |
596 | printk(" driver: %s\n", | |
597 | disk->driverfs_dev->driver->name); | |
598 | else | |
599 | printk(" (driver?)\n"); | |
600 | ||
601 | /* now show the partitions */ | |
e71bf0d0 TH |
602 | disk_part_iter_init(&piter, disk, 0); |
603 | while ((part = disk_part_iter_next(&piter))) | |
1f014290 TH |
604 | printk(" %s %10llu %s\n", |
605 | bdevt_str(part_devt(part), devt_buf), | |
f331c029 | 606 | (unsigned long long)part->nr_sects >> 1, |
1f014290 | 607 | disk_name(disk, part->partno, name_buf)); |
e71bf0d0 | 608 | disk_part_iter_exit(&piter); |
def4e38d TH |
609 | } |
610 | class_dev_iter_exit(&iter); | |
dd2a345f DG |
611 | } |
612 | ||
1da177e4 LT |
613 | #ifdef CONFIG_PROC_FS |
614 | /* iterator */ | |
def4e38d | 615 | static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
68c4d4a7 | 616 | { |
def4e38d TH |
617 | loff_t skip = *pos; |
618 | struct class_dev_iter *iter; | |
619 | struct device *dev; | |
68c4d4a7 | 620 | |
def4e38d TH |
621 | iter = kmalloc(GFP_KERNEL, sizeof(*iter)); |
622 | if (!iter) | |
623 | return ERR_PTR(-ENOMEM); | |
624 | ||
625 | seqf->private = iter; | |
626 | class_dev_iter_init(iter, &block_class, NULL, &disk_type); | |
627 | do { | |
628 | dev = class_dev_iter_next(iter); | |
629 | if (!dev) | |
630 | return NULL; | |
631 | } while (skip--); | |
632 | ||
633 | return dev_to_disk(dev); | |
68c4d4a7 GKH |
634 | } |
635 | ||
def4e38d | 636 | static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
1da177e4 | 637 | { |
edfaa7c3 | 638 | struct device *dev; |
1da177e4 | 639 | |
def4e38d TH |
640 | (*pos)++; |
641 | dev = class_dev_iter_next(seqf->private); | |
2ac3cee5 | 642 | if (dev) |
68c4d4a7 | 643 | return dev_to_disk(dev); |
2ac3cee5 | 644 | |
1da177e4 LT |
645 | return NULL; |
646 | } | |
647 | ||
def4e38d | 648 | static void disk_seqf_stop(struct seq_file *seqf, void *v) |
27f30251 | 649 | { |
def4e38d | 650 | struct class_dev_iter *iter = seqf->private; |
27f30251 | 651 | |
def4e38d TH |
652 | /* stop is called even after start failed :-( */ |
653 | if (iter) { | |
654 | class_dev_iter_exit(iter); | |
655 | kfree(iter); | |
5c0ef6d0 | 656 | } |
1da177e4 LT |
657 | } |
658 | ||
def4e38d | 659 | static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
1da177e4 | 660 | { |
def4e38d TH |
661 | static void *p; |
662 | ||
663 | p = disk_seqf_start(seqf, pos); | |
664 | if (!IS_ERR(p) && p) | |
665 | seq_puts(seqf, "major minor #blocks name\n\n"); | |
666 | return p; | |
1da177e4 LT |
667 | } |
668 | ||
cf771cb5 | 669 | static int show_partition(struct seq_file *seqf, void *v) |
1da177e4 LT |
670 | { |
671 | struct gendisk *sgp = v; | |
e71bf0d0 TH |
672 | struct disk_part_iter piter; |
673 | struct hd_struct *part; | |
1da177e4 LT |
674 | char buf[BDEVNAME_SIZE]; |
675 | ||
1da177e4 | 676 | /* Don't show non-partitionable removeable devices or empty devices */ |
b5d0b9df | 677 | if (!get_capacity(sgp) || (!disk_partitionable(sgp) && |
f331c029 | 678 | (sgp->flags & GENHD_FL_REMOVABLE))) |
1da177e4 LT |
679 | return 0; |
680 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
681 | return 0; | |
682 | ||
683 | /* show the full disk and all non-0 size partitions of it */ | |
1f014290 | 684 | seq_printf(seqf, "%4d %7d %10llu %s\n", |
f331c029 | 685 | MAJOR(disk_devt(sgp)), MINOR(disk_devt(sgp)), |
1da177e4 LT |
686 | (unsigned long long)get_capacity(sgp) >> 1, |
687 | disk_name(sgp, 0, buf)); | |
e71bf0d0 TH |
688 | |
689 | disk_part_iter_init(&piter, sgp, 0); | |
690 | while ((part = disk_part_iter_next(&piter))) | |
1f014290 | 691 | seq_printf(seqf, "%4d %7d %10llu %s\n", |
f331c029 TH |
692 | MAJOR(part_devt(part)), MINOR(part_devt(part)), |
693 | (unsigned long long)part->nr_sects >> 1, | |
694 | disk_name(sgp, part->partno, buf)); | |
e71bf0d0 | 695 | disk_part_iter_exit(&piter); |
1da177e4 LT |
696 | |
697 | return 0; | |
698 | } | |
699 | ||
12f32bb3 | 700 | const struct seq_operations partitions_op = { |
def4e38d TH |
701 | .start = show_partition_start, |
702 | .next = disk_seqf_next, | |
703 | .stop = disk_seqf_stop, | |
edfaa7c3 | 704 | .show = show_partition |
1da177e4 LT |
705 | }; |
706 | #endif | |
707 | ||
708 | ||
cf771cb5 | 709 | static struct kobject *base_probe(dev_t devt, int *partno, void *data) |
1da177e4 | 710 | { |
edfaa7c3 | 711 | if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
1da177e4 | 712 | /* Make old-style 2.4 aliases work */ |
edfaa7c3 | 713 | request_module("block-major-%d", MAJOR(devt)); |
1da177e4 LT |
714 | return NULL; |
715 | } | |
716 | ||
717 | static int __init genhd_device_init(void) | |
718 | { | |
e105b8bf DW |
719 | int error; |
720 | ||
721 | block_class.dev_kobj = sysfs_dev_block_kobj; | |
722 | error = class_register(&block_class); | |
ee27a558 RM |
723 | if (unlikely(error)) |
724 | return error; | |
edfaa7c3 | 725 | bdev_map = kobj_map_init(base_probe, &block_class_lock); |
1da177e4 | 726 | blk_dev_init(); |
edfaa7c3 KS |
727 | |
728 | #ifndef CONFIG_SYSFS_DEPRECATED | |
729 | /* create top-level block dir */ | |
730 | block_depr = kobject_create_and_add("block", NULL); | |
731 | #endif | |
830d3cfb | 732 | return 0; |
1da177e4 LT |
733 | } |
734 | ||
735 | subsys_initcall(genhd_device_init); | |
736 | ||
edfaa7c3 KS |
737 | static ssize_t disk_range_show(struct device *dev, |
738 | struct device_attribute *attr, char *buf) | |
1da177e4 | 739 | { |
edfaa7c3 | 740 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 741 | |
edfaa7c3 | 742 | return sprintf(buf, "%d\n", disk->minors); |
1da177e4 LT |
743 | } |
744 | ||
1f014290 TH |
745 | static ssize_t disk_ext_range_show(struct device *dev, |
746 | struct device_attribute *attr, char *buf) | |
747 | { | |
748 | struct gendisk *disk = dev_to_disk(dev); | |
749 | ||
b5d0b9df | 750 | return sprintf(buf, "%d\n", disk_max_parts(disk)); |
1f014290 TH |
751 | } |
752 | ||
edfaa7c3 KS |
753 | static ssize_t disk_removable_show(struct device *dev, |
754 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 755 | { |
edfaa7c3 | 756 | struct gendisk *disk = dev_to_disk(dev); |
a7fd6706 | 757 | |
edfaa7c3 KS |
758 | return sprintf(buf, "%d\n", |
759 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
a7fd6706 KS |
760 | } |
761 | ||
1c9ce527 KS |
762 | static ssize_t disk_ro_show(struct device *dev, |
763 | struct device_attribute *attr, char *buf) | |
764 | { | |
765 | struct gendisk *disk = dev_to_disk(dev); | |
766 | ||
767 | return sprintf(buf, "%d\n", disk->policy ? 1 : 0); | |
768 | } | |
769 | ||
edfaa7c3 KS |
770 | static ssize_t disk_size_show(struct device *dev, |
771 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 772 | { |
edfaa7c3 | 773 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 774 | |
edfaa7c3 | 775 | return sprintf(buf, "%llu\n", (unsigned long long)get_capacity(disk)); |
1da177e4 | 776 | } |
edfaa7c3 KS |
777 | |
778 | static ssize_t disk_capability_show(struct device *dev, | |
779 | struct device_attribute *attr, char *buf) | |
86ce18d7 | 780 | { |
edfaa7c3 KS |
781 | struct gendisk *disk = dev_to_disk(dev); |
782 | ||
783 | return sprintf(buf, "%x\n", disk->flags); | |
86ce18d7 | 784 | } |
edfaa7c3 KS |
785 | |
786 | static ssize_t disk_stat_show(struct device *dev, | |
787 | struct device_attribute *attr, char *buf) | |
1da177e4 | 788 | { |
edfaa7c3 | 789 | struct gendisk *disk = dev_to_disk(dev); |
c9959059 | 790 | int cpu; |
edfaa7c3 | 791 | |
c9959059 TH |
792 | cpu = disk_stat_lock(); |
793 | disk_round_stats(cpu, disk); | |
794 | disk_stat_unlock(); | |
edfaa7c3 | 795 | return sprintf(buf, |
837c7878 BW |
796 | "%8lu %8lu %8llu %8u " |
797 | "%8lu %8lu %8llu %8u " | |
1da177e4 LT |
798 | "%8u %8u %8u" |
799 | "\n", | |
47a00410 JA |
800 | disk_stat_read(disk, ios[READ]), |
801 | disk_stat_read(disk, merges[READ]), | |
802 | (unsigned long long)disk_stat_read(disk, sectors[READ]), | |
803 | jiffies_to_msecs(disk_stat_read(disk, ticks[READ])), | |
804 | disk_stat_read(disk, ios[WRITE]), | |
805 | disk_stat_read(disk, merges[WRITE]), | |
806 | (unsigned long long)disk_stat_read(disk, sectors[WRITE]), | |
807 | jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])), | |
1da177e4 LT |
808 | disk->in_flight, |
809 | jiffies_to_msecs(disk_stat_read(disk, io_ticks)), | |
810 | jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); | |
811 | } | |
1da177e4 | 812 | |
c17bb495 | 813 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
814 | static ssize_t disk_fail_show(struct device *dev, |
815 | struct device_attribute *attr, char *buf) | |
816 | { | |
817 | struct gendisk *disk = dev_to_disk(dev); | |
818 | ||
819 | return sprintf(buf, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0); | |
820 | } | |
c17bb495 | 821 | |
edfaa7c3 KS |
822 | static ssize_t disk_fail_store(struct device *dev, |
823 | struct device_attribute *attr, | |
c17bb495 AM |
824 | const char *buf, size_t count) |
825 | { | |
edfaa7c3 | 826 | struct gendisk *disk = dev_to_disk(dev); |
c17bb495 AM |
827 | int i; |
828 | ||
829 | if (count > 0 && sscanf(buf, "%d", &i) > 0) { | |
830 | if (i == 0) | |
831 | disk->flags &= ~GENHD_FL_FAIL; | |
832 | else | |
833 | disk->flags |= GENHD_FL_FAIL; | |
834 | } | |
835 | ||
836 | return count; | |
837 | } | |
c17bb495 AM |
838 | |
839 | #endif | |
840 | ||
edfaa7c3 | 841 | static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); |
1f014290 | 842 | static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL); |
edfaa7c3 | 843 | static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); |
1c9ce527 | 844 | static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); |
edfaa7c3 KS |
845 | static DEVICE_ATTR(size, S_IRUGO, disk_size_show, NULL); |
846 | static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); | |
847 | static DEVICE_ATTR(stat, S_IRUGO, disk_stat_show, NULL); | |
c17bb495 | 848 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
849 | static struct device_attribute dev_attr_fail = |
850 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, disk_fail_show, disk_fail_store); | |
c17bb495 | 851 | #endif |
edfaa7c3 KS |
852 | |
853 | static struct attribute *disk_attrs[] = { | |
854 | &dev_attr_range.attr, | |
1f014290 | 855 | &dev_attr_ext_range.attr, |
edfaa7c3 | 856 | &dev_attr_removable.attr, |
1c9ce527 | 857 | &dev_attr_ro.attr, |
edfaa7c3 KS |
858 | &dev_attr_size.attr, |
859 | &dev_attr_capability.attr, | |
860 | &dev_attr_stat.attr, | |
861 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
862 | &dev_attr_fail.attr, | |
863 | #endif | |
864 | NULL | |
865 | }; | |
866 | ||
867 | static struct attribute_group disk_attr_group = { | |
868 | .attrs = disk_attrs, | |
869 | }; | |
870 | ||
871 | static struct attribute_group *disk_attr_groups[] = { | |
872 | &disk_attr_group, | |
873 | NULL | |
1da177e4 LT |
874 | }; |
875 | ||
edfaa7c3 | 876 | static void disk_release(struct device *dev) |
1da177e4 | 877 | { |
edfaa7c3 KS |
878 | struct gendisk *disk = dev_to_disk(dev); |
879 | ||
1da177e4 | 880 | kfree(disk->random); |
e71bf0d0 | 881 | kfree(disk->__part); |
1da177e4 LT |
882 | free_disk_stats(disk); |
883 | kfree(disk); | |
884 | } | |
edfaa7c3 KS |
885 | struct class block_class = { |
886 | .name = "block", | |
1da177e4 LT |
887 | }; |
888 | ||
1826eadf | 889 | static struct device_type disk_type = { |
edfaa7c3 KS |
890 | .name = "disk", |
891 | .groups = disk_attr_groups, | |
892 | .release = disk_release, | |
1da177e4 LT |
893 | }; |
894 | ||
a6e2ba88 | 895 | #ifdef CONFIG_PROC_FS |
cf771cb5 TH |
896 | /* |
897 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
898 | * entries do, above, but makes them available through one seq_file. | |
899 | * | |
900 | * The output looks suspiciously like /proc/partitions with a bunch of | |
901 | * extra fields. | |
902 | */ | |
903 | static int diskstats_show(struct seq_file *seqf, void *v) | |
1da177e4 LT |
904 | { |
905 | struct gendisk *gp = v; | |
e71bf0d0 TH |
906 | struct disk_part_iter piter; |
907 | struct hd_struct *hd; | |
1da177e4 | 908 | char buf[BDEVNAME_SIZE]; |
c9959059 | 909 | int cpu; |
1da177e4 LT |
910 | |
911 | /* | |
ed9e1982 | 912 | if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) |
cf771cb5 | 913 | seq_puts(seqf, "major minor name" |
1da177e4 LT |
914 | " rio rmerge rsect ruse wio wmerge " |
915 | "wsect wuse running use aveq" | |
916 | "\n\n"); | |
917 | */ | |
918 | ||
c9959059 TH |
919 | cpu = disk_stat_lock(); |
920 | disk_round_stats(cpu, gp); | |
921 | disk_stat_unlock(); | |
1f014290 | 922 | seq_printf(seqf, "%4d %7d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n", |
f331c029 TH |
923 | MAJOR(disk_devt(gp)), MINOR(disk_devt(gp)), |
924 | disk_name(gp, 0, buf), | |
a362357b JA |
925 | disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), |
926 | (unsigned long long)disk_stat_read(gp, sectors[0]), | |
927 | jiffies_to_msecs(disk_stat_read(gp, ticks[0])), | |
928 | disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]), | |
929 | (unsigned long long)disk_stat_read(gp, sectors[1]), | |
930 | jiffies_to_msecs(disk_stat_read(gp, ticks[1])), | |
1da177e4 LT |
931 | gp->in_flight, |
932 | jiffies_to_msecs(disk_stat_read(gp, io_ticks)), | |
933 | jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); | |
934 | ||
935 | /* now show all non-0 size partitions of it */ | |
e71bf0d0 TH |
936 | disk_part_iter_init(&piter, gp, 0); |
937 | while ((hd = disk_part_iter_next(&piter))) { | |
c9959059 TH |
938 | cpu = disk_stat_lock(); |
939 | part_round_stats(cpu, hd); | |
940 | disk_stat_unlock(); | |
1f014290 | 941 | seq_printf(seqf, "%4d %7d %s %lu %lu %llu " |
28f39d55 | 942 | "%u %lu %lu %llu %u %u %u %u\n", |
f331c029 TH |
943 | MAJOR(part_devt(hd)), MINOR(part_devt(hd)), |
944 | disk_name(gp, hd->partno, buf), | |
28f39d55 JM |
945 | part_stat_read(hd, ios[0]), |
946 | part_stat_read(hd, merges[0]), | |
947 | (unsigned long long)part_stat_read(hd, sectors[0]), | |
948 | jiffies_to_msecs(part_stat_read(hd, ticks[0])), | |
949 | part_stat_read(hd, ios[1]), | |
950 | part_stat_read(hd, merges[1]), | |
951 | (unsigned long long)part_stat_read(hd, sectors[1]), | |
952 | jiffies_to_msecs(part_stat_read(hd, ticks[1])), | |
953 | hd->in_flight, | |
954 | jiffies_to_msecs(part_stat_read(hd, io_ticks)), | |
955 | jiffies_to_msecs(part_stat_read(hd, time_in_queue)) | |
956 | ); | |
1da177e4 | 957 | } |
e71bf0d0 | 958 | disk_part_iter_exit(&piter); |
1da177e4 LT |
959 | |
960 | return 0; | |
961 | } | |
962 | ||
12f32bb3 | 963 | const struct seq_operations diskstats_op = { |
def4e38d TH |
964 | .start = disk_seqf_start, |
965 | .next = disk_seqf_next, | |
966 | .stop = disk_seqf_stop, | |
1da177e4 LT |
967 | .show = diskstats_show |
968 | }; | |
a6e2ba88 | 969 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 970 | |
8ce7ad7b KCA |
971 | static void media_change_notify_thread(struct work_struct *work) |
972 | { | |
973 | struct gendisk *gd = container_of(work, struct gendisk, async_notify); | |
974 | char event[] = "MEDIA_CHANGE=1"; | |
975 | char *envp[] = { event, NULL }; | |
976 | ||
977 | /* | |
978 | * set enviroment vars to indicate which event this is for | |
979 | * so that user space will know to go check the media status. | |
980 | */ | |
ed9e1982 | 981 | kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp); |
8ce7ad7b KCA |
982 | put_device(gd->driverfs_dev); |
983 | } | |
984 | ||
1826eadf | 985 | #if 0 |
8ce7ad7b KCA |
986 | void genhd_media_change_notify(struct gendisk *disk) |
987 | { | |
988 | get_device(disk->driverfs_dev); | |
989 | schedule_work(&disk->async_notify); | |
990 | } | |
991 | EXPORT_SYMBOL_GPL(genhd_media_change_notify); | |
1826eadf | 992 | #endif /* 0 */ |
8ce7ad7b | 993 | |
cf771cb5 | 994 | dev_t blk_lookup_devt(const char *name, int partno) |
a142be85 | 995 | { |
def4e38d TH |
996 | dev_t devt = MKDEV(0, 0); |
997 | struct class_dev_iter iter; | |
998 | struct device *dev; | |
a142be85 | 999 | |
def4e38d TH |
1000 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); |
1001 | while ((dev = class_dev_iter_next(&iter))) { | |
a142be85 | 1002 | struct gendisk *disk = dev_to_disk(dev); |
a142be85 | 1003 | |
f331c029 TH |
1004 | if (strcmp(dev->bus_id, name)) |
1005 | continue; | |
b5d0b9df | 1006 | if (partno < 0 || partno >= disk_max_parts(disk)) |
f331c029 TH |
1007 | continue; |
1008 | ||
1009 | if (partno == 0) | |
1010 | devt = disk_devt(disk); | |
1011 | else { | |
e71bf0d0 | 1012 | struct hd_struct *part; |
f331c029 | 1013 | |
e71bf0d0 TH |
1014 | part = disk_get_part(disk, partno); |
1015 | if (!part || !part->nr_sects) { | |
1016 | disk_put_part(part); | |
f331c029 | 1017 | continue; |
e71bf0d0 | 1018 | } |
f331c029 TH |
1019 | |
1020 | devt = part_devt(part); | |
e71bf0d0 | 1021 | disk_put_part(part); |
def4e38d | 1022 | } |
f331c029 | 1023 | break; |
5c0ef6d0 | 1024 | } |
def4e38d | 1025 | class_dev_iter_exit(&iter); |
edfaa7c3 KS |
1026 | return devt; |
1027 | } | |
edfaa7c3 KS |
1028 | EXPORT_SYMBOL(blk_lookup_devt); |
1029 | ||
1da177e4 LT |
1030 | struct gendisk *alloc_disk(int minors) |
1031 | { | |
1946089a CL |
1032 | return alloc_disk_node(minors, -1); |
1033 | } | |
1034 | ||
1035 | struct gendisk *alloc_disk_node(int minors, int node_id) | |
bcce3de1 TH |
1036 | { |
1037 | return alloc_disk_ext_node(minors, 0, node_id); | |
1038 | } | |
1039 | ||
1040 | struct gendisk *alloc_disk_ext(int minors, int ext_minors) | |
1041 | { | |
1042 | return alloc_disk_ext_node(minors, ext_minors, -1); | |
1043 | } | |
1044 | ||
1045 | struct gendisk *alloc_disk_ext_node(int minors, int ext_minors, int node_id) | |
1946089a CL |
1046 | { |
1047 | struct gendisk *disk; | |
1048 | ||
94f6030c CL |
1049 | disk = kmalloc_node(sizeof(struct gendisk), |
1050 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 1051 | if (disk) { |
bcce3de1 | 1052 | int tot_minors = minors + ext_minors; |
b5d0b9df | 1053 | int size = tot_minors * sizeof(struct hd_struct *); |
bcce3de1 | 1054 | |
1da177e4 LT |
1055 | if (!init_disk_stats(disk)) { |
1056 | kfree(disk); | |
1057 | return NULL; | |
1058 | } | |
b5d0b9df TH |
1059 | |
1060 | disk->__part = kmalloc_node(size, GFP_KERNEL | __GFP_ZERO, | |
1061 | node_id); | |
1062 | if (!disk->__part) { | |
1063 | free_disk_stats(disk); | |
1064 | kfree(disk); | |
1065 | return NULL; | |
1da177e4 | 1066 | } |
b5d0b9df TH |
1067 | disk->__part[0] = &disk->part0; |
1068 | ||
1da177e4 | 1069 | disk->minors = minors; |
bcce3de1 | 1070 | disk->ext_minors = ext_minors; |
1da177e4 | 1071 | rand_initialize_disk(disk); |
ed9e1982 TH |
1072 | disk_to_dev(disk)->class = &block_class; |
1073 | disk_to_dev(disk)->type = &disk_type; | |
1074 | device_initialize(disk_to_dev(disk)); | |
8ce7ad7b KCA |
1075 | INIT_WORK(&disk->async_notify, |
1076 | media_change_notify_thread); | |
1da177e4 LT |
1077 | } |
1078 | return disk; | |
1079 | } | |
1080 | ||
1081 | EXPORT_SYMBOL(alloc_disk); | |
1946089a | 1082 | EXPORT_SYMBOL(alloc_disk_node); |
bcce3de1 TH |
1083 | EXPORT_SYMBOL(alloc_disk_ext); |
1084 | EXPORT_SYMBOL(alloc_disk_ext_node); | |
1da177e4 LT |
1085 | |
1086 | struct kobject *get_disk(struct gendisk *disk) | |
1087 | { | |
1088 | struct module *owner; | |
1089 | struct kobject *kobj; | |
1090 | ||
1091 | if (!disk->fops) | |
1092 | return NULL; | |
1093 | owner = disk->fops->owner; | |
1094 | if (owner && !try_module_get(owner)) | |
1095 | return NULL; | |
ed9e1982 | 1096 | kobj = kobject_get(&disk_to_dev(disk)->kobj); |
1da177e4 LT |
1097 | if (kobj == NULL) { |
1098 | module_put(owner); | |
1099 | return NULL; | |
1100 | } | |
1101 | return kobj; | |
1102 | ||
1103 | } | |
1104 | ||
1105 | EXPORT_SYMBOL(get_disk); | |
1106 | ||
1107 | void put_disk(struct gendisk *disk) | |
1108 | { | |
1109 | if (disk) | |
ed9e1982 | 1110 | kobject_put(&disk_to_dev(disk)->kobj); |
1da177e4 LT |
1111 | } |
1112 | ||
1113 | EXPORT_SYMBOL(put_disk); | |
1114 | ||
1115 | void set_device_ro(struct block_device *bdev, int flag) | |
1116 | { | |
1117 | if (bdev->bd_contains != bdev) | |
1118 | bdev->bd_part->policy = flag; | |
1119 | else | |
1120 | bdev->bd_disk->policy = flag; | |
1121 | } | |
1122 | ||
1123 | EXPORT_SYMBOL(set_device_ro); | |
1124 | ||
1125 | void set_disk_ro(struct gendisk *disk, int flag) | |
1126 | { | |
e71bf0d0 TH |
1127 | struct disk_part_iter piter; |
1128 | struct hd_struct *part; | |
1129 | ||
1da177e4 | 1130 | disk->policy = flag; |
e71bf0d0 TH |
1131 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); |
1132 | while ((part = disk_part_iter_next(&piter))) | |
1133 | part->policy = flag; | |
1134 | disk_part_iter_exit(&piter); | |
1da177e4 LT |
1135 | } |
1136 | ||
1137 | EXPORT_SYMBOL(set_disk_ro); | |
1138 | ||
1139 | int bdev_read_only(struct block_device *bdev) | |
1140 | { | |
1141 | if (!bdev) | |
1142 | return 0; | |
1143 | else if (bdev->bd_contains != bdev) | |
1144 | return bdev->bd_part->policy; | |
1145 | else | |
1146 | return bdev->bd_disk->policy; | |
1147 | } | |
1148 | ||
1149 | EXPORT_SYMBOL(bdev_read_only); | |
1150 | ||
cf771cb5 | 1151 | int invalidate_partition(struct gendisk *disk, int partno) |
1da177e4 LT |
1152 | { |
1153 | int res = 0; | |
cf771cb5 | 1154 | struct block_device *bdev = bdget_disk(disk, partno); |
1da177e4 | 1155 | if (bdev) { |
2ef41634 CH |
1156 | fsync_bdev(bdev); |
1157 | res = __invalidate_device(bdev); | |
1da177e4 LT |
1158 | bdput(bdev); |
1159 | } | |
1160 | return res; | |
1161 | } | |
1162 | ||
1163 | EXPORT_SYMBOL(invalidate_partition); |