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> | |
f500975a | 13 | #include <linux/proc_fs.h> |
1da177e4 LT |
14 | #include <linux/seq_file.h> |
15 | #include <linux/slab.h> | |
16 | #include <linux/kmod.h> | |
17 | #include <linux/kobj_map.h> | |
2ef41634 | 18 | #include <linux/buffer_head.h> |
58383af6 | 19 | #include <linux/mutex.h> |
bcce3de1 | 20 | #include <linux/idr.h> |
1da177e4 | 21 | |
ff88972c AB |
22 | #include "blk.h" |
23 | ||
edfaa7c3 KS |
24 | static DEFINE_MUTEX(block_class_lock); |
25 | #ifndef CONFIG_SYSFS_DEPRECATED | |
26 | struct kobject *block_depr; | |
27 | #endif | |
1da177e4 | 28 | |
bcce3de1 TH |
29 | /* for extended dynamic devt allocation, currently only one major is used */ |
30 | #define MAX_EXT_DEVT (1 << MINORBITS) | |
31 | ||
32 | /* For extended devt allocation. ext_devt_mutex prevents look up | |
33 | * results from going away underneath its user. | |
34 | */ | |
35 | static DEFINE_MUTEX(ext_devt_mutex); | |
36 | static DEFINE_IDR(ext_devt_idr); | |
37 | ||
1826eadf AB |
38 | static struct device_type disk_type; |
39 | ||
e71bf0d0 TH |
40 | /** |
41 | * disk_get_part - get partition | |
42 | * @disk: disk to look partition from | |
43 | * @partno: partition number | |
44 | * | |
45 | * Look for partition @partno from @disk. If found, increment | |
46 | * reference count and return it. | |
47 | * | |
48 | * CONTEXT: | |
49 | * Don't care. | |
50 | * | |
51 | * RETURNS: | |
52 | * Pointer to the found partition on success, NULL if not found. | |
53 | */ | |
54 | struct hd_struct *disk_get_part(struct gendisk *disk, int partno) | |
55 | { | |
540eed56 TH |
56 | struct hd_struct *part = NULL; |
57 | struct disk_part_tbl *ptbl; | |
e71bf0d0 | 58 | |
540eed56 | 59 | if (unlikely(partno < 0)) |
e71bf0d0 | 60 | return NULL; |
540eed56 | 61 | |
e71bf0d0 | 62 | rcu_read_lock(); |
540eed56 TH |
63 | |
64 | ptbl = rcu_dereference(disk->part_tbl); | |
65 | if (likely(partno < ptbl->len)) { | |
66 | part = rcu_dereference(ptbl->part[partno]); | |
67 | if (part) | |
68 | get_device(part_to_dev(part)); | |
69 | } | |
70 | ||
e71bf0d0 TH |
71 | rcu_read_unlock(); |
72 | ||
73 | return part; | |
74 | } | |
75 | EXPORT_SYMBOL_GPL(disk_get_part); | |
76 | ||
77 | /** | |
78 | * disk_part_iter_init - initialize partition iterator | |
79 | * @piter: iterator to initialize | |
80 | * @disk: disk to iterate over | |
81 | * @flags: DISK_PITER_* flags | |
82 | * | |
83 | * Initialize @piter so that it iterates over partitions of @disk. | |
84 | * | |
85 | * CONTEXT: | |
86 | * Don't care. | |
87 | */ | |
88 | void disk_part_iter_init(struct disk_part_iter *piter, struct gendisk *disk, | |
89 | unsigned int flags) | |
90 | { | |
540eed56 TH |
91 | struct disk_part_tbl *ptbl; |
92 | ||
93 | rcu_read_lock(); | |
94 | ptbl = rcu_dereference(disk->part_tbl); | |
95 | ||
e71bf0d0 TH |
96 | piter->disk = disk; |
97 | piter->part = NULL; | |
98 | ||
99 | if (flags & DISK_PITER_REVERSE) | |
540eed56 | 100 | piter->idx = ptbl->len - 1; |
b5d0b9df | 101 | else if (flags & DISK_PITER_INCL_PART0) |
e71bf0d0 | 102 | piter->idx = 0; |
b5d0b9df TH |
103 | else |
104 | piter->idx = 1; | |
e71bf0d0 TH |
105 | |
106 | piter->flags = flags; | |
540eed56 TH |
107 | |
108 | rcu_read_unlock(); | |
e71bf0d0 TH |
109 | } |
110 | EXPORT_SYMBOL_GPL(disk_part_iter_init); | |
111 | ||
112 | /** | |
113 | * disk_part_iter_next - proceed iterator to the next partition and return it | |
114 | * @piter: iterator of interest | |
115 | * | |
116 | * Proceed @piter to the next partition and return it. | |
117 | * | |
118 | * CONTEXT: | |
119 | * Don't care. | |
120 | */ | |
121 | struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter) | |
122 | { | |
540eed56 | 123 | struct disk_part_tbl *ptbl; |
e71bf0d0 TH |
124 | int inc, end; |
125 | ||
126 | /* put the last partition */ | |
127 | disk_put_part(piter->part); | |
128 | piter->part = NULL; | |
129 | ||
540eed56 | 130 | /* get part_tbl */ |
e71bf0d0 | 131 | rcu_read_lock(); |
540eed56 | 132 | ptbl = rcu_dereference(piter->disk->part_tbl); |
e71bf0d0 TH |
133 | |
134 | /* determine iteration parameters */ | |
135 | if (piter->flags & DISK_PITER_REVERSE) { | |
136 | inc = -1; | |
b5d0b9df TH |
137 | if (piter->flags & DISK_PITER_INCL_PART0) |
138 | end = -1; | |
139 | else | |
140 | end = 0; | |
e71bf0d0 TH |
141 | } else { |
142 | inc = 1; | |
540eed56 | 143 | end = ptbl->len; |
e71bf0d0 TH |
144 | } |
145 | ||
146 | /* iterate to the next partition */ | |
147 | for (; piter->idx != end; piter->idx += inc) { | |
148 | struct hd_struct *part; | |
149 | ||
540eed56 | 150 | part = rcu_dereference(ptbl->part[piter->idx]); |
e71bf0d0 TH |
151 | if (!part) |
152 | continue; | |
153 | if (!(piter->flags & DISK_PITER_INCL_EMPTY) && !part->nr_sects) | |
154 | continue; | |
155 | ||
ed9e1982 | 156 | get_device(part_to_dev(part)); |
e71bf0d0 TH |
157 | piter->part = part; |
158 | piter->idx += inc; | |
159 | break; | |
160 | } | |
161 | ||
162 | rcu_read_unlock(); | |
163 | ||
164 | return piter->part; | |
165 | } | |
166 | EXPORT_SYMBOL_GPL(disk_part_iter_next); | |
167 | ||
168 | /** | |
169 | * disk_part_iter_exit - finish up partition iteration | |
170 | * @piter: iter of interest | |
171 | * | |
172 | * Called when iteration is over. Cleans up @piter. | |
173 | * | |
174 | * CONTEXT: | |
175 | * Don't care. | |
176 | */ | |
177 | void disk_part_iter_exit(struct disk_part_iter *piter) | |
178 | { | |
179 | disk_put_part(piter->part); | |
180 | piter->part = NULL; | |
181 | } | |
182 | EXPORT_SYMBOL_GPL(disk_part_iter_exit); | |
183 | ||
a6f23657 JA |
184 | static inline int sector_in_part(struct hd_struct *part, sector_t sector) |
185 | { | |
186 | return part->start_sect <= sector && | |
187 | sector < part->start_sect + part->nr_sects; | |
188 | } | |
189 | ||
e71bf0d0 TH |
190 | /** |
191 | * disk_map_sector_rcu - map sector to partition | |
192 | * @disk: gendisk of interest | |
193 | * @sector: sector to map | |
194 | * | |
195 | * Find out which partition @sector maps to on @disk. This is | |
196 | * primarily used for stats accounting. | |
197 | * | |
198 | * CONTEXT: | |
199 | * RCU read locked. The returned partition pointer is valid only | |
200 | * while preemption is disabled. | |
201 | * | |
202 | * RETURNS: | |
074a7aca | 203 | * Found partition on success, part0 is returned if no partition matches |
e71bf0d0 TH |
204 | */ |
205 | struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) | |
206 | { | |
540eed56 | 207 | struct disk_part_tbl *ptbl; |
a6f23657 | 208 | struct hd_struct *part; |
e71bf0d0 TH |
209 | int i; |
210 | ||
540eed56 TH |
211 | ptbl = rcu_dereference(disk->part_tbl); |
212 | ||
a6f23657 JA |
213 | part = rcu_dereference(ptbl->last_lookup); |
214 | if (part && sector_in_part(part, sector)) | |
215 | return part; | |
216 | ||
540eed56 | 217 | for (i = 1; i < ptbl->len; i++) { |
a6f23657 | 218 | part = rcu_dereference(ptbl->part[i]); |
e71bf0d0 | 219 | |
a6f23657 JA |
220 | if (part && sector_in_part(part, sector)) { |
221 | rcu_assign_pointer(ptbl->last_lookup, part); | |
e71bf0d0 | 222 | return part; |
a6f23657 | 223 | } |
e71bf0d0 | 224 | } |
074a7aca | 225 | return &disk->part0; |
e71bf0d0 TH |
226 | } |
227 | EXPORT_SYMBOL_GPL(disk_map_sector_rcu); | |
228 | ||
1da177e4 LT |
229 | /* |
230 | * Can be deleted altogether. Later. | |
231 | * | |
232 | */ | |
233 | static struct blk_major_name { | |
234 | struct blk_major_name *next; | |
235 | int major; | |
236 | char name[16]; | |
68eef3b4 | 237 | } *major_names[BLKDEV_MAJOR_HASH_SIZE]; |
1da177e4 LT |
238 | |
239 | /* index in the above - for now: assume no multimajor ranges */ | |
240 | static inline int major_to_index(int major) | |
241 | { | |
68eef3b4 | 242 | return major % BLKDEV_MAJOR_HASH_SIZE; |
7170be5f NH |
243 | } |
244 | ||
68eef3b4 | 245 | #ifdef CONFIG_PROC_FS |
cf771cb5 | 246 | void blkdev_show(struct seq_file *seqf, off_t offset) |
7170be5f | 247 | { |
68eef3b4 | 248 | struct blk_major_name *dp; |
7170be5f | 249 | |
68eef3b4 | 250 | if (offset < BLKDEV_MAJOR_HASH_SIZE) { |
edfaa7c3 | 251 | mutex_lock(&block_class_lock); |
68eef3b4 | 252 | for (dp = major_names[offset]; dp; dp = dp->next) |
cf771cb5 | 253 | seq_printf(seqf, "%3d %s\n", dp->major, dp->name); |
edfaa7c3 | 254 | mutex_unlock(&block_class_lock); |
1da177e4 | 255 | } |
1da177e4 | 256 | } |
68eef3b4 | 257 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 258 | |
9e8c0bcc MN |
259 | /** |
260 | * register_blkdev - register a new block device | |
261 | * | |
262 | * @major: the requested major device number [1..255]. If @major=0, try to | |
263 | * allocate any unused major number. | |
264 | * @name: the name of the new block device as a zero terminated string | |
265 | * | |
266 | * The @name must be unique within the system. | |
267 | * | |
268 | * The return value depends on the @major input parameter. | |
269 | * - if a major device number was requested in range [1..255] then the | |
270 | * function returns zero on success, or a negative error code | |
271 | * - if any unused major number was requested with @major=0 parameter | |
272 | * then the return value is the allocated major number in range | |
273 | * [1..255] or a negative error code otherwise | |
274 | */ | |
1da177e4 LT |
275 | int register_blkdev(unsigned int major, const char *name) |
276 | { | |
277 | struct blk_major_name **n, *p; | |
278 | int index, ret = 0; | |
279 | ||
edfaa7c3 | 280 | mutex_lock(&block_class_lock); |
1da177e4 LT |
281 | |
282 | /* temporary */ | |
283 | if (major == 0) { | |
284 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { | |
285 | if (major_names[index] == NULL) | |
286 | break; | |
287 | } | |
288 | ||
289 | if (index == 0) { | |
290 | printk("register_blkdev: failed to get major for %s\n", | |
291 | name); | |
292 | ret = -EBUSY; | |
293 | goto out; | |
294 | } | |
295 | major = index; | |
296 | ret = major; | |
297 | } | |
298 | ||
299 | p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); | |
300 | if (p == NULL) { | |
301 | ret = -ENOMEM; | |
302 | goto out; | |
303 | } | |
304 | ||
305 | p->major = major; | |
306 | strlcpy(p->name, name, sizeof(p->name)); | |
307 | p->next = NULL; | |
308 | index = major_to_index(major); | |
309 | ||
310 | for (n = &major_names[index]; *n; n = &(*n)->next) { | |
311 | if ((*n)->major == major) | |
312 | break; | |
313 | } | |
314 | if (!*n) | |
315 | *n = p; | |
316 | else | |
317 | ret = -EBUSY; | |
318 | ||
319 | if (ret < 0) { | |
320 | printk("register_blkdev: cannot get major %d for %s\n", | |
321 | major, name); | |
322 | kfree(p); | |
323 | } | |
324 | out: | |
edfaa7c3 | 325 | mutex_unlock(&block_class_lock); |
1da177e4 LT |
326 | return ret; |
327 | } | |
328 | ||
329 | EXPORT_SYMBOL(register_blkdev); | |
330 | ||
f4480240 | 331 | void unregister_blkdev(unsigned int major, const char *name) |
1da177e4 LT |
332 | { |
333 | struct blk_major_name **n; | |
334 | struct blk_major_name *p = NULL; | |
335 | int index = major_to_index(major); | |
1da177e4 | 336 | |
edfaa7c3 | 337 | mutex_lock(&block_class_lock); |
1da177e4 LT |
338 | for (n = &major_names[index]; *n; n = &(*n)->next) |
339 | if ((*n)->major == major) | |
340 | break; | |
294462a5 AM |
341 | if (!*n || strcmp((*n)->name, name)) { |
342 | WARN_ON(1); | |
294462a5 | 343 | } else { |
1da177e4 LT |
344 | p = *n; |
345 | *n = p->next; | |
346 | } | |
edfaa7c3 | 347 | mutex_unlock(&block_class_lock); |
1da177e4 | 348 | kfree(p); |
1da177e4 LT |
349 | } |
350 | ||
351 | EXPORT_SYMBOL(unregister_blkdev); | |
352 | ||
353 | static struct kobj_map *bdev_map; | |
354 | ||
870d6656 TH |
355 | /** |
356 | * blk_mangle_minor - scatter minor numbers apart | |
357 | * @minor: minor number to mangle | |
358 | * | |
359 | * Scatter consecutively allocated @minor number apart if MANGLE_DEVT | |
360 | * is enabled. Mangling twice gives the original value. | |
361 | * | |
362 | * RETURNS: | |
363 | * Mangled value. | |
364 | * | |
365 | * CONTEXT: | |
366 | * Don't care. | |
367 | */ | |
368 | static int blk_mangle_minor(int minor) | |
369 | { | |
370 | #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT | |
371 | int i; | |
372 | ||
373 | for (i = 0; i < MINORBITS / 2; i++) { | |
374 | int low = minor & (1 << i); | |
375 | int high = minor & (1 << (MINORBITS - 1 - i)); | |
376 | int distance = MINORBITS - 1 - 2 * i; | |
377 | ||
378 | minor ^= low | high; /* clear both bits */ | |
379 | low <<= distance; /* swap the positions */ | |
380 | high >>= distance; | |
381 | minor |= low | high; /* and set */ | |
382 | } | |
383 | #endif | |
384 | return minor; | |
385 | } | |
386 | ||
bcce3de1 TH |
387 | /** |
388 | * blk_alloc_devt - allocate a dev_t for a partition | |
389 | * @part: partition to allocate dev_t for | |
bcce3de1 TH |
390 | * @devt: out parameter for resulting dev_t |
391 | * | |
392 | * Allocate a dev_t for block device. | |
393 | * | |
394 | * RETURNS: | |
395 | * 0 on success, allocated dev_t is returned in *@devt. -errno on | |
396 | * failure. | |
397 | * | |
398 | * CONTEXT: | |
399 | * Might sleep. | |
400 | */ | |
401 | int blk_alloc_devt(struct hd_struct *part, dev_t *devt) | |
402 | { | |
403 | struct gendisk *disk = part_to_disk(part); | |
404 | int idx, rc; | |
405 | ||
406 | /* in consecutive minor range? */ | |
407 | if (part->partno < disk->minors) { | |
408 | *devt = MKDEV(disk->major, disk->first_minor + part->partno); | |
409 | return 0; | |
410 | } | |
411 | ||
412 | /* allocate ext devt */ | |
413 | do { | |
414 | if (!idr_pre_get(&ext_devt_idr, GFP_KERNEL)) | |
415 | return -ENOMEM; | |
416 | rc = idr_get_new(&ext_devt_idr, part, &idx); | |
417 | } while (rc == -EAGAIN); | |
418 | ||
419 | if (rc) | |
420 | return rc; | |
421 | ||
422 | if (idx > MAX_EXT_DEVT) { | |
423 | idr_remove(&ext_devt_idr, idx); | |
424 | return -EBUSY; | |
425 | } | |
426 | ||
870d6656 | 427 | *devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx)); |
bcce3de1 TH |
428 | return 0; |
429 | } | |
430 | ||
431 | /** | |
432 | * blk_free_devt - free a dev_t | |
433 | * @devt: dev_t to free | |
434 | * | |
435 | * Free @devt which was allocated using blk_alloc_devt(). | |
436 | * | |
437 | * CONTEXT: | |
438 | * Might sleep. | |
439 | */ | |
440 | void blk_free_devt(dev_t devt) | |
441 | { | |
442 | might_sleep(); | |
443 | ||
444 | if (devt == MKDEV(0, 0)) | |
445 | return; | |
446 | ||
447 | if (MAJOR(devt) == BLOCK_EXT_MAJOR) { | |
448 | mutex_lock(&ext_devt_mutex); | |
870d6656 | 449 | idr_remove(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
bcce3de1 TH |
450 | mutex_unlock(&ext_devt_mutex); |
451 | } | |
452 | } | |
453 | ||
1f014290 TH |
454 | static char *bdevt_str(dev_t devt, char *buf) |
455 | { | |
456 | if (MAJOR(devt) <= 0xff && MINOR(devt) <= 0xff) { | |
457 | char tbuf[BDEVT_SIZE]; | |
458 | snprintf(tbuf, BDEVT_SIZE, "%02x%02x", MAJOR(devt), MINOR(devt)); | |
459 | snprintf(buf, BDEVT_SIZE, "%-9s", tbuf); | |
460 | } else | |
461 | snprintf(buf, BDEVT_SIZE, "%03x:%05x", MAJOR(devt), MINOR(devt)); | |
462 | ||
463 | return buf; | |
464 | } | |
465 | ||
1da177e4 LT |
466 | /* |
467 | * Register device numbers dev..(dev+range-1) | |
468 | * range must be nonzero | |
469 | * The hash chain is sorted on range, so that subranges can override. | |
470 | */ | |
edfaa7c3 | 471 | void blk_register_region(dev_t devt, unsigned long range, struct module *module, |
1da177e4 LT |
472 | struct kobject *(*probe)(dev_t, int *, void *), |
473 | int (*lock)(dev_t, void *), void *data) | |
474 | { | |
edfaa7c3 | 475 | kobj_map(bdev_map, devt, range, module, probe, lock, data); |
1da177e4 LT |
476 | } |
477 | ||
478 | EXPORT_SYMBOL(blk_register_region); | |
479 | ||
edfaa7c3 | 480 | void blk_unregister_region(dev_t devt, unsigned long range) |
1da177e4 | 481 | { |
edfaa7c3 | 482 | kobj_unmap(bdev_map, devt, range); |
1da177e4 LT |
483 | } |
484 | ||
485 | EXPORT_SYMBOL(blk_unregister_region); | |
486 | ||
cf771cb5 | 487 | static struct kobject *exact_match(dev_t devt, int *partno, void *data) |
1da177e4 LT |
488 | { |
489 | struct gendisk *p = data; | |
edfaa7c3 | 490 | |
ed9e1982 | 491 | return &disk_to_dev(p)->kobj; |
1da177e4 LT |
492 | } |
493 | ||
edfaa7c3 | 494 | static int exact_lock(dev_t devt, void *data) |
1da177e4 LT |
495 | { |
496 | struct gendisk *p = data; | |
497 | ||
498 | if (!get_disk(p)) | |
499 | return -1; | |
500 | return 0; | |
501 | } | |
502 | ||
503 | /** | |
504 | * add_disk - add partitioning information to kernel list | |
505 | * @disk: per-device partitioning information | |
506 | * | |
507 | * This function registers the partitioning information in @disk | |
508 | * with the kernel. | |
3e1a7ff8 TH |
509 | * |
510 | * FIXME: error handling | |
1da177e4 LT |
511 | */ |
512 | void add_disk(struct gendisk *disk) | |
513 | { | |
cf0ca9fe | 514 | struct backing_dev_info *bdi; |
3e1a7ff8 | 515 | dev_t devt; |
6ffeea77 | 516 | int retval; |
cf0ca9fe | 517 | |
3e1a7ff8 TH |
518 | /* minors == 0 indicates to use ext devt from part0 and should |
519 | * be accompanied with EXT_DEVT flag. Make sure all | |
520 | * parameters make sense. | |
521 | */ | |
522 | WARN_ON(disk->minors && !(disk->major || disk->first_minor)); | |
523 | WARN_ON(!disk->minors && !(disk->flags & GENHD_FL_EXT_DEVT)); | |
524 | ||
1da177e4 | 525 | disk->flags |= GENHD_FL_UP; |
3e1a7ff8 TH |
526 | |
527 | retval = blk_alloc_devt(&disk->part0, &devt); | |
528 | if (retval) { | |
529 | WARN_ON(1); | |
530 | return; | |
531 | } | |
532 | disk_to_dev(disk)->devt = devt; | |
533 | ||
534 | /* ->major and ->first_minor aren't supposed to be | |
535 | * dereferenced from here on, but set them just in case. | |
536 | */ | |
537 | disk->major = MAJOR(devt); | |
538 | disk->first_minor = MINOR(devt); | |
539 | ||
f331c029 TH |
540 | blk_register_region(disk_devt(disk), disk->minors, NULL, |
541 | exact_match, exact_lock, disk); | |
1da177e4 LT |
542 | register_disk(disk); |
543 | blk_register_queue(disk); | |
cf0ca9fe PZ |
544 | |
545 | bdi = &disk->queue->backing_dev_info; | |
f331c029 | 546 | bdi_register_dev(bdi, disk_devt(disk)); |
ed9e1982 TH |
547 | retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj, |
548 | "bdi"); | |
6ffeea77 | 549 | WARN_ON(retval); |
1da177e4 LT |
550 | } |
551 | ||
552 | EXPORT_SYMBOL(add_disk); | |
553 | EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ | |
554 | ||
555 | void unlink_gendisk(struct gendisk *disk) | |
556 | { | |
ed9e1982 | 557 | sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); |
cf0ca9fe | 558 | bdi_unregister(&disk->queue->backing_dev_info); |
1da177e4 | 559 | blk_unregister_queue(disk); |
f331c029 | 560 | blk_unregister_region(disk_devt(disk), disk->minors); |
1da177e4 LT |
561 | } |
562 | ||
1da177e4 LT |
563 | /** |
564 | * get_gendisk - get partitioning information for a given device | |
710027a4 | 565 | * @devt: device to get partitioning information for |
496aa8a9 | 566 | * @partno: returned partition index |
1da177e4 LT |
567 | * |
568 | * This function gets the structure containing partitioning | |
710027a4 | 569 | * information for the given device @devt. |
1da177e4 | 570 | */ |
cf771cb5 | 571 | struct gendisk *get_gendisk(dev_t devt, int *partno) |
1da177e4 | 572 | { |
bcce3de1 TH |
573 | struct gendisk *disk = NULL; |
574 | ||
575 | if (MAJOR(devt) != BLOCK_EXT_MAJOR) { | |
576 | struct kobject *kobj; | |
577 | ||
578 | kobj = kobj_lookup(bdev_map, devt, partno); | |
579 | if (kobj) | |
580 | disk = dev_to_disk(kobj_to_dev(kobj)); | |
581 | } else { | |
582 | struct hd_struct *part; | |
583 | ||
584 | mutex_lock(&ext_devt_mutex); | |
870d6656 | 585 | part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
bcce3de1 TH |
586 | if (part && get_disk(part_to_disk(part))) { |
587 | *partno = part->partno; | |
588 | disk = part_to_disk(part); | |
589 | } | |
590 | mutex_unlock(&ext_devt_mutex); | |
591 | } | |
edfaa7c3 | 592 | |
bcce3de1 | 593 | return disk; |
1da177e4 LT |
594 | } |
595 | ||
f331c029 TH |
596 | /** |
597 | * bdget_disk - do bdget() by gendisk and partition number | |
598 | * @disk: gendisk of interest | |
599 | * @partno: partition number | |
600 | * | |
601 | * Find partition @partno from @disk, do bdget() on it. | |
602 | * | |
603 | * CONTEXT: | |
604 | * Don't care. | |
605 | * | |
606 | * RETURNS: | |
607 | * Resulting block_device on success, NULL on failure. | |
608 | */ | |
aeb3d3a8 | 609 | struct block_device *bdget_disk(struct gendisk *disk, int partno) |
f331c029 | 610 | { |
548b10eb TH |
611 | struct hd_struct *part; |
612 | struct block_device *bdev = NULL; | |
f331c029 | 613 | |
548b10eb | 614 | part = disk_get_part(disk, partno); |
2bbedcb4 | 615 | if (part) |
548b10eb TH |
616 | bdev = bdget(part_devt(part)); |
617 | disk_put_part(part); | |
f331c029 | 618 | |
548b10eb | 619 | return bdev; |
f331c029 TH |
620 | } |
621 | EXPORT_SYMBOL(bdget_disk); | |
622 | ||
5c6f35c5 GKH |
623 | /* |
624 | * print a full list of all partitions - intended for places where the root | |
625 | * filesystem can't be mounted and thus to give the victim some idea of what | |
626 | * went wrong | |
627 | */ | |
628 | void __init printk_all_partitions(void) | |
629 | { | |
def4e38d TH |
630 | struct class_dev_iter iter; |
631 | struct device *dev; | |
632 | ||
633 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); | |
634 | while ((dev = class_dev_iter_next(&iter))) { | |
635 | struct gendisk *disk = dev_to_disk(dev); | |
e71bf0d0 TH |
636 | struct disk_part_iter piter; |
637 | struct hd_struct *part; | |
1f014290 TH |
638 | char name_buf[BDEVNAME_SIZE]; |
639 | char devt_buf[BDEVT_SIZE]; | |
def4e38d TH |
640 | |
641 | /* | |
642 | * Don't show empty devices or things that have been | |
643 | * surpressed | |
644 | */ | |
645 | if (get_capacity(disk) == 0 || | |
646 | (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) | |
647 | continue; | |
648 | ||
649 | /* | |
650 | * Note, unlike /proc/partitions, I am showing the | |
651 | * numbers in hex - the same format as the root= | |
652 | * option takes. | |
653 | */ | |
074a7aca TH |
654 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); |
655 | while ((part = disk_part_iter_next(&piter))) { | |
656 | bool is_part0 = part == &disk->part0; | |
def4e38d | 657 | |
074a7aca | 658 | printk("%s%s %10llu %s", is_part0 ? "" : " ", |
1f014290 | 659 | bdevt_str(part_devt(part), devt_buf), |
f331c029 | 660 | (unsigned long long)part->nr_sects >> 1, |
1f014290 | 661 | disk_name(disk, part->partno, name_buf)); |
074a7aca TH |
662 | if (is_part0) { |
663 | if (disk->driverfs_dev != NULL && | |
664 | disk->driverfs_dev->driver != NULL) | |
665 | printk(" driver: %s\n", | |
666 | disk->driverfs_dev->driver->name); | |
667 | else | |
668 | printk(" (driver?)\n"); | |
669 | } else | |
670 | printk("\n"); | |
671 | } | |
e71bf0d0 | 672 | disk_part_iter_exit(&piter); |
def4e38d TH |
673 | } |
674 | class_dev_iter_exit(&iter); | |
dd2a345f DG |
675 | } |
676 | ||
1da177e4 LT |
677 | #ifdef CONFIG_PROC_FS |
678 | /* iterator */ | |
def4e38d | 679 | static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
68c4d4a7 | 680 | { |
def4e38d TH |
681 | loff_t skip = *pos; |
682 | struct class_dev_iter *iter; | |
683 | struct device *dev; | |
68c4d4a7 | 684 | |
aeb3d3a8 | 685 | iter = kmalloc(sizeof(*iter), GFP_KERNEL); |
def4e38d TH |
686 | if (!iter) |
687 | return ERR_PTR(-ENOMEM); | |
688 | ||
689 | seqf->private = iter; | |
690 | class_dev_iter_init(iter, &block_class, NULL, &disk_type); | |
691 | do { | |
692 | dev = class_dev_iter_next(iter); | |
693 | if (!dev) | |
694 | return NULL; | |
695 | } while (skip--); | |
696 | ||
697 | return dev_to_disk(dev); | |
68c4d4a7 GKH |
698 | } |
699 | ||
def4e38d | 700 | static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
1da177e4 | 701 | { |
edfaa7c3 | 702 | struct device *dev; |
1da177e4 | 703 | |
def4e38d TH |
704 | (*pos)++; |
705 | dev = class_dev_iter_next(seqf->private); | |
2ac3cee5 | 706 | if (dev) |
68c4d4a7 | 707 | return dev_to_disk(dev); |
2ac3cee5 | 708 | |
1da177e4 LT |
709 | return NULL; |
710 | } | |
711 | ||
def4e38d | 712 | static void disk_seqf_stop(struct seq_file *seqf, void *v) |
27f30251 | 713 | { |
def4e38d | 714 | struct class_dev_iter *iter = seqf->private; |
27f30251 | 715 | |
def4e38d TH |
716 | /* stop is called even after start failed :-( */ |
717 | if (iter) { | |
718 | class_dev_iter_exit(iter); | |
719 | kfree(iter); | |
5c0ef6d0 | 720 | } |
1da177e4 LT |
721 | } |
722 | ||
def4e38d | 723 | static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
1da177e4 | 724 | { |
def4e38d TH |
725 | static void *p; |
726 | ||
727 | p = disk_seqf_start(seqf, pos); | |
243294da | 728 | if (!IS_ERR(p) && p && !*pos) |
def4e38d TH |
729 | seq_puts(seqf, "major minor #blocks name\n\n"); |
730 | return p; | |
1da177e4 LT |
731 | } |
732 | ||
cf771cb5 | 733 | static int show_partition(struct seq_file *seqf, void *v) |
1da177e4 LT |
734 | { |
735 | struct gendisk *sgp = v; | |
e71bf0d0 TH |
736 | struct disk_part_iter piter; |
737 | struct hd_struct *part; | |
1da177e4 LT |
738 | char buf[BDEVNAME_SIZE]; |
739 | ||
1da177e4 | 740 | /* Don't show non-partitionable removeable devices or empty devices */ |
b5d0b9df | 741 | if (!get_capacity(sgp) || (!disk_partitionable(sgp) && |
f331c029 | 742 | (sgp->flags & GENHD_FL_REMOVABLE))) |
1da177e4 LT |
743 | return 0; |
744 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
745 | return 0; | |
746 | ||
747 | /* show the full disk and all non-0 size partitions of it */ | |
074a7aca | 748 | disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0); |
e71bf0d0 | 749 | while ((part = disk_part_iter_next(&piter))) |
1f014290 | 750 | seq_printf(seqf, "%4d %7d %10llu %s\n", |
f331c029 TH |
751 | MAJOR(part_devt(part)), MINOR(part_devt(part)), |
752 | (unsigned long long)part->nr_sects >> 1, | |
753 | disk_name(sgp, part->partno, buf)); | |
e71bf0d0 | 754 | disk_part_iter_exit(&piter); |
1da177e4 LT |
755 | |
756 | return 0; | |
757 | } | |
758 | ||
f500975a | 759 | static const struct seq_operations partitions_op = { |
def4e38d TH |
760 | .start = show_partition_start, |
761 | .next = disk_seqf_next, | |
762 | .stop = disk_seqf_stop, | |
edfaa7c3 | 763 | .show = show_partition |
1da177e4 | 764 | }; |
f500975a AD |
765 | |
766 | static int partitions_open(struct inode *inode, struct file *file) | |
767 | { | |
768 | return seq_open(file, &partitions_op); | |
769 | } | |
770 | ||
771 | static const struct file_operations proc_partitions_operations = { | |
772 | .open = partitions_open, | |
773 | .read = seq_read, | |
774 | .llseek = seq_lseek, | |
775 | .release = seq_release, | |
776 | }; | |
1da177e4 LT |
777 | #endif |
778 | ||
779 | ||
cf771cb5 | 780 | static struct kobject *base_probe(dev_t devt, int *partno, void *data) |
1da177e4 | 781 | { |
edfaa7c3 | 782 | if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
1da177e4 | 783 | /* Make old-style 2.4 aliases work */ |
edfaa7c3 | 784 | request_module("block-major-%d", MAJOR(devt)); |
1da177e4 LT |
785 | return NULL; |
786 | } | |
787 | ||
788 | static int __init genhd_device_init(void) | |
789 | { | |
e105b8bf DW |
790 | int error; |
791 | ||
792 | block_class.dev_kobj = sysfs_dev_block_kobj; | |
793 | error = class_register(&block_class); | |
ee27a558 RM |
794 | if (unlikely(error)) |
795 | return error; | |
edfaa7c3 | 796 | bdev_map = kobj_map_init(base_probe, &block_class_lock); |
1da177e4 | 797 | blk_dev_init(); |
edfaa7c3 | 798 | |
561ec68e ZY |
799 | register_blkdev(BLOCK_EXT_MAJOR, "blkext"); |
800 | ||
edfaa7c3 KS |
801 | #ifndef CONFIG_SYSFS_DEPRECATED |
802 | /* create top-level block dir */ | |
803 | block_depr = kobject_create_and_add("block", NULL); | |
804 | #endif | |
830d3cfb | 805 | return 0; |
1da177e4 LT |
806 | } |
807 | ||
808 | subsys_initcall(genhd_device_init); | |
809 | ||
edfaa7c3 KS |
810 | static ssize_t disk_range_show(struct device *dev, |
811 | struct device_attribute *attr, char *buf) | |
1da177e4 | 812 | { |
edfaa7c3 | 813 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 814 | |
edfaa7c3 | 815 | return sprintf(buf, "%d\n", disk->minors); |
1da177e4 LT |
816 | } |
817 | ||
1f014290 TH |
818 | static ssize_t disk_ext_range_show(struct device *dev, |
819 | struct device_attribute *attr, char *buf) | |
820 | { | |
821 | struct gendisk *disk = dev_to_disk(dev); | |
822 | ||
b5d0b9df | 823 | return sprintf(buf, "%d\n", disk_max_parts(disk)); |
1f014290 TH |
824 | } |
825 | ||
edfaa7c3 KS |
826 | static ssize_t disk_removable_show(struct device *dev, |
827 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 828 | { |
edfaa7c3 | 829 | struct gendisk *disk = dev_to_disk(dev); |
a7fd6706 | 830 | |
edfaa7c3 KS |
831 | return sprintf(buf, "%d\n", |
832 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
a7fd6706 KS |
833 | } |
834 | ||
1c9ce527 KS |
835 | static ssize_t disk_ro_show(struct device *dev, |
836 | struct device_attribute *attr, char *buf) | |
837 | { | |
838 | struct gendisk *disk = dev_to_disk(dev); | |
839 | ||
b7db9956 | 840 | return sprintf(buf, "%d\n", get_disk_ro(disk) ? 1 : 0); |
1c9ce527 KS |
841 | } |
842 | ||
edfaa7c3 KS |
843 | static ssize_t disk_capability_show(struct device *dev, |
844 | struct device_attribute *attr, char *buf) | |
86ce18d7 | 845 | { |
edfaa7c3 KS |
846 | struct gendisk *disk = dev_to_disk(dev); |
847 | ||
848 | return sprintf(buf, "%x\n", disk->flags); | |
86ce18d7 | 849 | } |
edfaa7c3 | 850 | |
edfaa7c3 | 851 | static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); |
1f014290 | 852 | static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL); |
edfaa7c3 | 853 | static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); |
1c9ce527 | 854 | static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); |
e5610521 | 855 | static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); |
edfaa7c3 | 856 | static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); |
074a7aca | 857 | static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); |
c17bb495 | 858 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 | 859 | static struct device_attribute dev_attr_fail = |
eddb2e26 | 860 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); |
c17bb495 | 861 | #endif |
581d4e28 JA |
862 | #ifdef CONFIG_FAIL_IO_TIMEOUT |
863 | static struct device_attribute dev_attr_fail_timeout = | |
864 | __ATTR(io-timeout-fail, S_IRUGO|S_IWUSR, part_timeout_show, | |
865 | part_timeout_store); | |
866 | #endif | |
edfaa7c3 KS |
867 | |
868 | static struct attribute *disk_attrs[] = { | |
869 | &dev_attr_range.attr, | |
1f014290 | 870 | &dev_attr_ext_range.attr, |
edfaa7c3 | 871 | &dev_attr_removable.attr, |
1c9ce527 | 872 | &dev_attr_ro.attr, |
edfaa7c3 KS |
873 | &dev_attr_size.attr, |
874 | &dev_attr_capability.attr, | |
875 | &dev_attr_stat.attr, | |
876 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
877 | &dev_attr_fail.attr, | |
581d4e28 JA |
878 | #endif |
879 | #ifdef CONFIG_FAIL_IO_TIMEOUT | |
880 | &dev_attr_fail_timeout.attr, | |
edfaa7c3 KS |
881 | #endif |
882 | NULL | |
883 | }; | |
884 | ||
885 | static struct attribute_group disk_attr_group = { | |
886 | .attrs = disk_attrs, | |
887 | }; | |
888 | ||
889 | static struct attribute_group *disk_attr_groups[] = { | |
890 | &disk_attr_group, | |
891 | NULL | |
1da177e4 LT |
892 | }; |
893 | ||
540eed56 TH |
894 | static void disk_free_ptbl_rcu_cb(struct rcu_head *head) |
895 | { | |
896 | struct disk_part_tbl *ptbl = | |
897 | container_of(head, struct disk_part_tbl, rcu_head); | |
898 | ||
899 | kfree(ptbl); | |
900 | } | |
901 | ||
902 | /** | |
903 | * disk_replace_part_tbl - replace disk->part_tbl in RCU-safe way | |
904 | * @disk: disk to replace part_tbl for | |
905 | * @new_ptbl: new part_tbl to install | |
906 | * | |
907 | * Replace disk->part_tbl with @new_ptbl in RCU-safe way. The | |
908 | * original ptbl is freed using RCU callback. | |
909 | * | |
910 | * LOCKING: | |
911 | * Matching bd_mutx locked. | |
912 | */ | |
913 | static void disk_replace_part_tbl(struct gendisk *disk, | |
914 | struct disk_part_tbl *new_ptbl) | |
915 | { | |
916 | struct disk_part_tbl *old_ptbl = disk->part_tbl; | |
917 | ||
918 | rcu_assign_pointer(disk->part_tbl, new_ptbl); | |
a6f23657 JA |
919 | |
920 | if (old_ptbl) { | |
921 | rcu_assign_pointer(old_ptbl->last_lookup, NULL); | |
540eed56 | 922 | call_rcu(&old_ptbl->rcu_head, disk_free_ptbl_rcu_cb); |
a6f23657 | 923 | } |
540eed56 TH |
924 | } |
925 | ||
926 | /** | |
927 | * disk_expand_part_tbl - expand disk->part_tbl | |
928 | * @disk: disk to expand part_tbl for | |
929 | * @partno: expand such that this partno can fit in | |
930 | * | |
931 | * Expand disk->part_tbl such that @partno can fit in. disk->part_tbl | |
932 | * uses RCU to allow unlocked dereferencing for stats and other stuff. | |
933 | * | |
934 | * LOCKING: | |
935 | * Matching bd_mutex locked, might sleep. | |
936 | * | |
937 | * RETURNS: | |
938 | * 0 on success, -errno on failure. | |
939 | */ | |
940 | int disk_expand_part_tbl(struct gendisk *disk, int partno) | |
941 | { | |
942 | struct disk_part_tbl *old_ptbl = disk->part_tbl; | |
943 | struct disk_part_tbl *new_ptbl; | |
944 | int len = old_ptbl ? old_ptbl->len : 0; | |
945 | int target = partno + 1; | |
946 | size_t size; | |
947 | int i; | |
948 | ||
949 | /* disk_max_parts() is zero during initialization, ignore if so */ | |
950 | if (disk_max_parts(disk) && target > disk_max_parts(disk)) | |
951 | return -EINVAL; | |
952 | ||
953 | if (target <= len) | |
954 | return 0; | |
955 | ||
956 | size = sizeof(*new_ptbl) + target * sizeof(new_ptbl->part[0]); | |
957 | new_ptbl = kzalloc_node(size, GFP_KERNEL, disk->node_id); | |
958 | if (!new_ptbl) | |
959 | return -ENOMEM; | |
960 | ||
961 | INIT_RCU_HEAD(&new_ptbl->rcu_head); | |
962 | new_ptbl->len = target; | |
963 | ||
964 | for (i = 0; i < len; i++) | |
965 | rcu_assign_pointer(new_ptbl->part[i], old_ptbl->part[i]); | |
966 | ||
967 | disk_replace_part_tbl(disk, new_ptbl); | |
968 | return 0; | |
969 | } | |
970 | ||
edfaa7c3 | 971 | static void disk_release(struct device *dev) |
1da177e4 | 972 | { |
edfaa7c3 KS |
973 | struct gendisk *disk = dev_to_disk(dev); |
974 | ||
1da177e4 | 975 | kfree(disk->random); |
540eed56 | 976 | disk_replace_part_tbl(disk, NULL); |
074a7aca | 977 | free_part_stats(&disk->part0); |
1da177e4 LT |
978 | kfree(disk); |
979 | } | |
edfaa7c3 KS |
980 | struct class block_class = { |
981 | .name = "block", | |
1da177e4 LT |
982 | }; |
983 | ||
1826eadf | 984 | static struct device_type disk_type = { |
edfaa7c3 KS |
985 | .name = "disk", |
986 | .groups = disk_attr_groups, | |
987 | .release = disk_release, | |
1da177e4 LT |
988 | }; |
989 | ||
a6e2ba88 | 990 | #ifdef CONFIG_PROC_FS |
cf771cb5 TH |
991 | /* |
992 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
993 | * entries do, above, but makes them available through one seq_file. | |
994 | * | |
995 | * The output looks suspiciously like /proc/partitions with a bunch of | |
996 | * extra fields. | |
997 | */ | |
998 | static int diskstats_show(struct seq_file *seqf, void *v) | |
1da177e4 LT |
999 | { |
1000 | struct gendisk *gp = v; | |
e71bf0d0 TH |
1001 | struct disk_part_iter piter; |
1002 | struct hd_struct *hd; | |
1da177e4 | 1003 | char buf[BDEVNAME_SIZE]; |
c9959059 | 1004 | int cpu; |
1da177e4 LT |
1005 | |
1006 | /* | |
ed9e1982 | 1007 | if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) |
cf771cb5 | 1008 | seq_puts(seqf, "major minor name" |
1da177e4 LT |
1009 | " rio rmerge rsect ruse wio wmerge " |
1010 | "wsect wuse running use aveq" | |
1011 | "\n\n"); | |
1012 | */ | |
1013 | ||
074a7aca | 1014 | disk_part_iter_init(&piter, gp, DISK_PITER_INCL_PART0); |
e71bf0d0 | 1015 | while ((hd = disk_part_iter_next(&piter))) { |
074a7aca | 1016 | cpu = part_stat_lock(); |
c9959059 | 1017 | part_round_stats(cpu, hd); |
074a7aca | 1018 | part_stat_unlock(); |
1f014290 | 1019 | seq_printf(seqf, "%4d %7d %s %lu %lu %llu " |
28f39d55 | 1020 | "%u %lu %lu %llu %u %u %u %u\n", |
f331c029 TH |
1021 | MAJOR(part_devt(hd)), MINOR(part_devt(hd)), |
1022 | disk_name(gp, hd->partno, buf), | |
28f39d55 JM |
1023 | part_stat_read(hd, ios[0]), |
1024 | part_stat_read(hd, merges[0]), | |
1025 | (unsigned long long)part_stat_read(hd, sectors[0]), | |
1026 | jiffies_to_msecs(part_stat_read(hd, ticks[0])), | |
1027 | part_stat_read(hd, ios[1]), | |
1028 | part_stat_read(hd, merges[1]), | |
1029 | (unsigned long long)part_stat_read(hd, sectors[1]), | |
1030 | jiffies_to_msecs(part_stat_read(hd, ticks[1])), | |
1031 | hd->in_flight, | |
1032 | jiffies_to_msecs(part_stat_read(hd, io_ticks)), | |
1033 | jiffies_to_msecs(part_stat_read(hd, time_in_queue)) | |
1034 | ); | |
1da177e4 | 1035 | } |
e71bf0d0 | 1036 | disk_part_iter_exit(&piter); |
1da177e4 LT |
1037 | |
1038 | return 0; | |
1039 | } | |
1040 | ||
31d85ab2 | 1041 | static const struct seq_operations diskstats_op = { |
def4e38d TH |
1042 | .start = disk_seqf_start, |
1043 | .next = disk_seqf_next, | |
1044 | .stop = disk_seqf_stop, | |
1da177e4 LT |
1045 | .show = diskstats_show |
1046 | }; | |
f500975a | 1047 | |
31d85ab2 AD |
1048 | static int diskstats_open(struct inode *inode, struct file *file) |
1049 | { | |
1050 | return seq_open(file, &diskstats_op); | |
1051 | } | |
1052 | ||
1053 | static const struct file_operations proc_diskstats_operations = { | |
1054 | .open = diskstats_open, | |
1055 | .read = seq_read, | |
1056 | .llseek = seq_lseek, | |
1057 | .release = seq_release, | |
1058 | }; | |
1059 | ||
f500975a AD |
1060 | static int __init proc_genhd_init(void) |
1061 | { | |
31d85ab2 | 1062 | proc_create("diskstats", 0, NULL, &proc_diskstats_operations); |
f500975a AD |
1063 | proc_create("partitions", 0, NULL, &proc_partitions_operations); |
1064 | return 0; | |
1065 | } | |
1066 | module_init(proc_genhd_init); | |
a6e2ba88 | 1067 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 1068 | |
8ce7ad7b KCA |
1069 | static void media_change_notify_thread(struct work_struct *work) |
1070 | { | |
1071 | struct gendisk *gd = container_of(work, struct gendisk, async_notify); | |
1072 | char event[] = "MEDIA_CHANGE=1"; | |
1073 | char *envp[] = { event, NULL }; | |
1074 | ||
1075 | /* | |
1076 | * set enviroment vars to indicate which event this is for | |
1077 | * so that user space will know to go check the media status. | |
1078 | */ | |
ed9e1982 | 1079 | kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp); |
8ce7ad7b KCA |
1080 | put_device(gd->driverfs_dev); |
1081 | } | |
1082 | ||
1826eadf | 1083 | #if 0 |
8ce7ad7b KCA |
1084 | void genhd_media_change_notify(struct gendisk *disk) |
1085 | { | |
1086 | get_device(disk->driverfs_dev); | |
1087 | schedule_work(&disk->async_notify); | |
1088 | } | |
1089 | EXPORT_SYMBOL_GPL(genhd_media_change_notify); | |
1826eadf | 1090 | #endif /* 0 */ |
8ce7ad7b | 1091 | |
cf771cb5 | 1092 | dev_t blk_lookup_devt(const char *name, int partno) |
a142be85 | 1093 | { |
def4e38d TH |
1094 | dev_t devt = MKDEV(0, 0); |
1095 | struct class_dev_iter iter; | |
1096 | struct device *dev; | |
a142be85 | 1097 | |
def4e38d TH |
1098 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); |
1099 | while ((dev = class_dev_iter_next(&iter))) { | |
a142be85 | 1100 | struct gendisk *disk = dev_to_disk(dev); |
548b10eb | 1101 | struct hd_struct *part; |
a142be85 | 1102 | |
3ada8b7e | 1103 | if (strcmp(dev_name(dev), name)) |
f331c029 | 1104 | continue; |
f331c029 | 1105 | |
41b8c853 NB |
1106 | if (partno < disk->minors) { |
1107 | /* We need to return the right devno, even | |
1108 | * if the partition doesn't exist yet. | |
1109 | */ | |
1110 | devt = MKDEV(MAJOR(dev->devt), | |
1111 | MINOR(dev->devt) + partno); | |
1112 | break; | |
1113 | } | |
548b10eb | 1114 | part = disk_get_part(disk, partno); |
2bbedcb4 | 1115 | if (part) { |
f331c029 | 1116 | devt = part_devt(part); |
e71bf0d0 | 1117 | disk_put_part(part); |
548b10eb | 1118 | break; |
def4e38d | 1119 | } |
548b10eb | 1120 | disk_put_part(part); |
5c0ef6d0 | 1121 | } |
def4e38d | 1122 | class_dev_iter_exit(&iter); |
edfaa7c3 KS |
1123 | return devt; |
1124 | } | |
edfaa7c3 KS |
1125 | EXPORT_SYMBOL(blk_lookup_devt); |
1126 | ||
1da177e4 LT |
1127 | struct gendisk *alloc_disk(int minors) |
1128 | { | |
1946089a CL |
1129 | return alloc_disk_node(minors, -1); |
1130 | } | |
689d6fac | 1131 | EXPORT_SYMBOL(alloc_disk); |
1946089a CL |
1132 | |
1133 | struct gendisk *alloc_disk_node(int minors, int node_id) | |
1134 | { | |
1135 | struct gendisk *disk; | |
1136 | ||
94f6030c CL |
1137 | disk = kmalloc_node(sizeof(struct gendisk), |
1138 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 1139 | if (disk) { |
074a7aca | 1140 | if (!init_part_stats(&disk->part0)) { |
1da177e4 LT |
1141 | kfree(disk); |
1142 | return NULL; | |
1143 | } | |
bf91db18 | 1144 | disk->node_id = node_id; |
540eed56 TH |
1145 | if (disk_expand_part_tbl(disk, 0)) { |
1146 | free_part_stats(&disk->part0); | |
b5d0b9df TH |
1147 | kfree(disk); |
1148 | return NULL; | |
1da177e4 | 1149 | } |
540eed56 | 1150 | disk->part_tbl->part[0] = &disk->part0; |
b5d0b9df | 1151 | |
1da177e4 | 1152 | disk->minors = minors; |
1da177e4 | 1153 | rand_initialize_disk(disk); |
ed9e1982 TH |
1154 | disk_to_dev(disk)->class = &block_class; |
1155 | disk_to_dev(disk)->type = &disk_type; | |
1156 | device_initialize(disk_to_dev(disk)); | |
8ce7ad7b KCA |
1157 | INIT_WORK(&disk->async_notify, |
1158 | media_change_notify_thread); | |
1da177e4 LT |
1159 | } |
1160 | return disk; | |
1161 | } | |
1946089a | 1162 | EXPORT_SYMBOL(alloc_disk_node); |
1da177e4 LT |
1163 | |
1164 | struct kobject *get_disk(struct gendisk *disk) | |
1165 | { | |
1166 | struct module *owner; | |
1167 | struct kobject *kobj; | |
1168 | ||
1169 | if (!disk->fops) | |
1170 | return NULL; | |
1171 | owner = disk->fops->owner; | |
1172 | if (owner && !try_module_get(owner)) | |
1173 | return NULL; | |
ed9e1982 | 1174 | kobj = kobject_get(&disk_to_dev(disk)->kobj); |
1da177e4 LT |
1175 | if (kobj == NULL) { |
1176 | module_put(owner); | |
1177 | return NULL; | |
1178 | } | |
1179 | return kobj; | |
1180 | ||
1181 | } | |
1182 | ||
1183 | EXPORT_SYMBOL(get_disk); | |
1184 | ||
1185 | void put_disk(struct gendisk *disk) | |
1186 | { | |
1187 | if (disk) | |
ed9e1982 | 1188 | kobject_put(&disk_to_dev(disk)->kobj); |
1da177e4 LT |
1189 | } |
1190 | ||
1191 | EXPORT_SYMBOL(put_disk); | |
1192 | ||
1193 | void set_device_ro(struct block_device *bdev, int flag) | |
1194 | { | |
b7db9956 | 1195 | bdev->bd_part->policy = flag; |
1da177e4 LT |
1196 | } |
1197 | ||
1198 | EXPORT_SYMBOL(set_device_ro); | |
1199 | ||
1200 | void set_disk_ro(struct gendisk *disk, int flag) | |
1201 | { | |
e71bf0d0 TH |
1202 | struct disk_part_iter piter; |
1203 | struct hd_struct *part; | |
1204 | ||
b7db9956 TH |
1205 | disk_part_iter_init(&piter, disk, |
1206 | DISK_PITER_INCL_EMPTY | DISK_PITER_INCL_PART0); | |
e71bf0d0 TH |
1207 | while ((part = disk_part_iter_next(&piter))) |
1208 | part->policy = flag; | |
1209 | disk_part_iter_exit(&piter); | |
1da177e4 LT |
1210 | } |
1211 | ||
1212 | EXPORT_SYMBOL(set_disk_ro); | |
1213 | ||
1214 | int bdev_read_only(struct block_device *bdev) | |
1215 | { | |
1216 | if (!bdev) | |
1217 | return 0; | |
b7db9956 | 1218 | return bdev->bd_part->policy; |
1da177e4 LT |
1219 | } |
1220 | ||
1221 | EXPORT_SYMBOL(bdev_read_only); | |
1222 | ||
cf771cb5 | 1223 | int invalidate_partition(struct gendisk *disk, int partno) |
1da177e4 LT |
1224 | { |
1225 | int res = 0; | |
cf771cb5 | 1226 | struct block_device *bdev = bdget_disk(disk, partno); |
1da177e4 | 1227 | if (bdev) { |
2ef41634 CH |
1228 | fsync_bdev(bdev); |
1229 | res = __invalidate_device(bdev); | |
1da177e4 LT |
1230 | bdput(bdev); |
1231 | } | |
1232 | return res; | |
1233 | } | |
1234 | ||
1235 | EXPORT_SYMBOL(invalidate_partition); |