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> | |
58383af6 | 18 | #include <linux/mutex.h> |
bcce3de1 | 19 | #include <linux/idr.h> |
77ea887e | 20 | #include <linux/log2.h> |
25e823c8 | 21 | #include <linux/pm_runtime.h> |
1da177e4 | 22 | |
3c2a0909 S |
23 | #ifdef CONFIG_BLOCK_SUPPORT_STLOG |
24 | #include <linux/stlog.h> | |
25 | #else | |
26 | #define ST_LOG(fmt,...) | |
27 | #endif | |
28 | ||
ff88972c AB |
29 | #include "blk.h" |
30 | ||
edfaa7c3 | 31 | static DEFINE_MUTEX(block_class_lock); |
edfaa7c3 | 32 | struct kobject *block_depr; |
1da177e4 | 33 | |
bcce3de1 | 34 | /* for extended dynamic devt allocation, currently only one major is used */ |
ce23bba8 | 35 | #define NR_EXT_DEVT (1 << MINORBITS) |
bcce3de1 | 36 | |
3710e26e | 37 | /* For extended devt allocation. ext_devt_lock prevents look up |
bcce3de1 TH |
38 | * results from going away underneath its user. |
39 | */ | |
3710e26e | 40 | static DEFINE_SPINLOCK(ext_devt_lock); |
bcce3de1 TH |
41 | static DEFINE_IDR(ext_devt_idr); |
42 | ||
1826eadf AB |
43 | static struct device_type disk_type; |
44 | ||
12c2bdb2 DB |
45 | static void disk_check_events(struct disk_events *ev, |
46 | unsigned int *clearing_ptr); | |
9f53d2fe | 47 | static void disk_alloc_events(struct gendisk *disk); |
77ea887e TH |
48 | static void disk_add_events(struct gendisk *disk); |
49 | static void disk_del_events(struct gendisk *disk); | |
50 | static void disk_release_events(struct gendisk *disk); | |
51 | ||
e71bf0d0 TH |
52 | /** |
53 | * disk_get_part - get partition | |
54 | * @disk: disk to look partition from | |
55 | * @partno: partition number | |
56 | * | |
57 | * Look for partition @partno from @disk. If found, increment | |
58 | * reference count and return it. | |
59 | * | |
60 | * CONTEXT: | |
61 | * Don't care. | |
62 | * | |
63 | * RETURNS: | |
64 | * Pointer to the found partition on success, NULL if not found. | |
65 | */ | |
66 | struct hd_struct *disk_get_part(struct gendisk *disk, int partno) | |
67 | { | |
540eed56 TH |
68 | struct hd_struct *part = NULL; |
69 | struct disk_part_tbl *ptbl; | |
e71bf0d0 | 70 | |
540eed56 | 71 | if (unlikely(partno < 0)) |
e71bf0d0 | 72 | return NULL; |
540eed56 | 73 | |
e71bf0d0 | 74 | rcu_read_lock(); |
540eed56 TH |
75 | |
76 | ptbl = rcu_dereference(disk->part_tbl); | |
77 | if (likely(partno < ptbl->len)) { | |
78 | part = rcu_dereference(ptbl->part[partno]); | |
79 | if (part) | |
80 | get_device(part_to_dev(part)); | |
81 | } | |
82 | ||
e71bf0d0 TH |
83 | rcu_read_unlock(); |
84 | ||
85 | return part; | |
86 | } | |
87 | EXPORT_SYMBOL_GPL(disk_get_part); | |
88 | ||
89 | /** | |
90 | * disk_part_iter_init - initialize partition iterator | |
91 | * @piter: iterator to initialize | |
92 | * @disk: disk to iterate over | |
93 | * @flags: DISK_PITER_* flags | |
94 | * | |
95 | * Initialize @piter so that it iterates over partitions of @disk. | |
96 | * | |
97 | * CONTEXT: | |
98 | * Don't care. | |
99 | */ | |
100 | void disk_part_iter_init(struct disk_part_iter *piter, struct gendisk *disk, | |
101 | unsigned int flags) | |
102 | { | |
540eed56 TH |
103 | struct disk_part_tbl *ptbl; |
104 | ||
105 | rcu_read_lock(); | |
106 | ptbl = rcu_dereference(disk->part_tbl); | |
107 | ||
e71bf0d0 TH |
108 | piter->disk = disk; |
109 | piter->part = NULL; | |
110 | ||
111 | if (flags & DISK_PITER_REVERSE) | |
540eed56 | 112 | piter->idx = ptbl->len - 1; |
71982a40 | 113 | else if (flags & (DISK_PITER_INCL_PART0 | DISK_PITER_INCL_EMPTY_PART0)) |
e71bf0d0 | 114 | piter->idx = 0; |
b5d0b9df TH |
115 | else |
116 | piter->idx = 1; | |
e71bf0d0 TH |
117 | |
118 | piter->flags = flags; | |
540eed56 TH |
119 | |
120 | rcu_read_unlock(); | |
e71bf0d0 TH |
121 | } |
122 | EXPORT_SYMBOL_GPL(disk_part_iter_init); | |
123 | ||
124 | /** | |
125 | * disk_part_iter_next - proceed iterator to the next partition and return it | |
126 | * @piter: iterator of interest | |
127 | * | |
128 | * Proceed @piter to the next partition and return it. | |
129 | * | |
130 | * CONTEXT: | |
131 | * Don't care. | |
132 | */ | |
133 | struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter) | |
134 | { | |
540eed56 | 135 | struct disk_part_tbl *ptbl; |
e71bf0d0 TH |
136 | int inc, end; |
137 | ||
138 | /* put the last partition */ | |
139 | disk_put_part(piter->part); | |
140 | piter->part = NULL; | |
141 | ||
540eed56 | 142 | /* get part_tbl */ |
e71bf0d0 | 143 | rcu_read_lock(); |
540eed56 | 144 | ptbl = rcu_dereference(piter->disk->part_tbl); |
e71bf0d0 TH |
145 | |
146 | /* determine iteration parameters */ | |
147 | if (piter->flags & DISK_PITER_REVERSE) { | |
148 | inc = -1; | |
71982a40 TH |
149 | if (piter->flags & (DISK_PITER_INCL_PART0 | |
150 | DISK_PITER_INCL_EMPTY_PART0)) | |
b5d0b9df TH |
151 | end = -1; |
152 | else | |
153 | end = 0; | |
e71bf0d0 TH |
154 | } else { |
155 | inc = 1; | |
540eed56 | 156 | end = ptbl->len; |
e71bf0d0 TH |
157 | } |
158 | ||
159 | /* iterate to the next partition */ | |
160 | for (; piter->idx != end; piter->idx += inc) { | |
161 | struct hd_struct *part; | |
162 | ||
540eed56 | 163 | part = rcu_dereference(ptbl->part[piter->idx]); |
e71bf0d0 TH |
164 | if (!part) |
165 | continue; | |
c83f6bf9 | 166 | if (!part_nr_sects_read(part) && |
71982a40 TH |
167 | !(piter->flags & DISK_PITER_INCL_EMPTY) && |
168 | !(piter->flags & DISK_PITER_INCL_EMPTY_PART0 && | |
169 | piter->idx == 0)) | |
e71bf0d0 TH |
170 | continue; |
171 | ||
ed9e1982 | 172 | get_device(part_to_dev(part)); |
e71bf0d0 TH |
173 | piter->part = part; |
174 | piter->idx += inc; | |
175 | break; | |
176 | } | |
177 | ||
178 | rcu_read_unlock(); | |
179 | ||
180 | return piter->part; | |
181 | } | |
182 | EXPORT_SYMBOL_GPL(disk_part_iter_next); | |
183 | ||
184 | /** | |
185 | * disk_part_iter_exit - finish up partition iteration | |
186 | * @piter: iter of interest | |
187 | * | |
188 | * Called when iteration is over. Cleans up @piter. | |
189 | * | |
190 | * CONTEXT: | |
191 | * Don't care. | |
192 | */ | |
193 | void disk_part_iter_exit(struct disk_part_iter *piter) | |
194 | { | |
195 | disk_put_part(piter->part); | |
196 | piter->part = NULL; | |
197 | } | |
198 | EXPORT_SYMBOL_GPL(disk_part_iter_exit); | |
199 | ||
a6f23657 JA |
200 | static inline int sector_in_part(struct hd_struct *part, sector_t sector) |
201 | { | |
202 | return part->start_sect <= sector && | |
c83f6bf9 | 203 | sector < part->start_sect + part_nr_sects_read(part); |
a6f23657 JA |
204 | } |
205 | ||
e71bf0d0 TH |
206 | /** |
207 | * disk_map_sector_rcu - map sector to partition | |
208 | * @disk: gendisk of interest | |
209 | * @sector: sector to map | |
210 | * | |
211 | * Find out which partition @sector maps to on @disk. This is | |
212 | * primarily used for stats accounting. | |
213 | * | |
214 | * CONTEXT: | |
215 | * RCU read locked. The returned partition pointer is valid only | |
216 | * while preemption is disabled. | |
217 | * | |
218 | * RETURNS: | |
074a7aca | 219 | * Found partition on success, part0 is returned if no partition matches |
e71bf0d0 TH |
220 | */ |
221 | struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) | |
222 | { | |
540eed56 | 223 | struct disk_part_tbl *ptbl; |
a6f23657 | 224 | struct hd_struct *part; |
e71bf0d0 TH |
225 | int i; |
226 | ||
540eed56 TH |
227 | ptbl = rcu_dereference(disk->part_tbl); |
228 | ||
a6f23657 JA |
229 | part = rcu_dereference(ptbl->last_lookup); |
230 | if (part && sector_in_part(part, sector)) | |
231 | return part; | |
232 | ||
540eed56 | 233 | for (i = 1; i < ptbl->len; i++) { |
a6f23657 | 234 | part = rcu_dereference(ptbl->part[i]); |
e71bf0d0 | 235 | |
a6f23657 JA |
236 | if (part && sector_in_part(part, sector)) { |
237 | rcu_assign_pointer(ptbl->last_lookup, part); | |
e71bf0d0 | 238 | return part; |
a6f23657 | 239 | } |
e71bf0d0 | 240 | } |
074a7aca | 241 | return &disk->part0; |
e71bf0d0 TH |
242 | } |
243 | EXPORT_SYMBOL_GPL(disk_map_sector_rcu); | |
244 | ||
1da177e4 LT |
245 | /* |
246 | * Can be deleted altogether. Later. | |
247 | * | |
248 | */ | |
249 | static struct blk_major_name { | |
250 | struct blk_major_name *next; | |
251 | int major; | |
252 | char name[16]; | |
68eef3b4 | 253 | } *major_names[BLKDEV_MAJOR_HASH_SIZE]; |
1da177e4 LT |
254 | |
255 | /* index in the above - for now: assume no multimajor ranges */ | |
e61eb2e9 | 256 | static inline int major_to_index(unsigned major) |
1da177e4 | 257 | { |
68eef3b4 | 258 | return major % BLKDEV_MAJOR_HASH_SIZE; |
7170be5f NH |
259 | } |
260 | ||
68eef3b4 | 261 | #ifdef CONFIG_PROC_FS |
cf771cb5 | 262 | void blkdev_show(struct seq_file *seqf, off_t offset) |
7170be5f | 263 | { |
68eef3b4 | 264 | struct blk_major_name *dp; |
7170be5f | 265 | |
68eef3b4 | 266 | if (offset < BLKDEV_MAJOR_HASH_SIZE) { |
edfaa7c3 | 267 | mutex_lock(&block_class_lock); |
68eef3b4 | 268 | for (dp = major_names[offset]; dp; dp = dp->next) |
cf771cb5 | 269 | seq_printf(seqf, "%3d %s\n", dp->major, dp->name); |
edfaa7c3 | 270 | mutex_unlock(&block_class_lock); |
1da177e4 | 271 | } |
1da177e4 | 272 | } |
68eef3b4 | 273 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 274 | |
9e8c0bcc MN |
275 | /** |
276 | * register_blkdev - register a new block device | |
277 | * | |
278 | * @major: the requested major device number [1..255]. If @major=0, try to | |
279 | * allocate any unused major number. | |
280 | * @name: the name of the new block device as a zero terminated string | |
281 | * | |
282 | * The @name must be unique within the system. | |
283 | * | |
284 | * The return value depends on the @major input parameter. | |
285 | * - if a major device number was requested in range [1..255] then the | |
286 | * function returns zero on success, or a negative error code | |
287 | * - if any unused major number was requested with @major=0 parameter | |
288 | * then the return value is the allocated major number in range | |
289 | * [1..255] or a negative error code otherwise | |
290 | */ | |
1da177e4 LT |
291 | int register_blkdev(unsigned int major, const char *name) |
292 | { | |
293 | struct blk_major_name **n, *p; | |
294 | int index, ret = 0; | |
295 | ||
edfaa7c3 | 296 | mutex_lock(&block_class_lock); |
1da177e4 LT |
297 | |
298 | /* temporary */ | |
299 | if (major == 0) { | |
300 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { | |
301 | if (major_names[index] == NULL) | |
302 | break; | |
303 | } | |
304 | ||
305 | if (index == 0) { | |
306 | printk("register_blkdev: failed to get major for %s\n", | |
307 | name); | |
308 | ret = -EBUSY; | |
309 | goto out; | |
310 | } | |
311 | major = index; | |
312 | ret = major; | |
313 | } | |
314 | ||
315 | p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); | |
316 | if (p == NULL) { | |
317 | ret = -ENOMEM; | |
318 | goto out; | |
319 | } | |
320 | ||
321 | p->major = major; | |
322 | strlcpy(p->name, name, sizeof(p->name)); | |
323 | p->next = NULL; | |
324 | index = major_to_index(major); | |
325 | ||
326 | for (n = &major_names[index]; *n; n = &(*n)->next) { | |
327 | if ((*n)->major == major) | |
328 | break; | |
329 | } | |
330 | if (!*n) | |
331 | *n = p; | |
332 | else | |
333 | ret = -EBUSY; | |
334 | ||
335 | if (ret < 0) { | |
336 | printk("register_blkdev: cannot get major %d for %s\n", | |
337 | major, name); | |
338 | kfree(p); | |
339 | } | |
340 | out: | |
edfaa7c3 | 341 | mutex_unlock(&block_class_lock); |
1da177e4 LT |
342 | return ret; |
343 | } | |
344 | ||
345 | EXPORT_SYMBOL(register_blkdev); | |
346 | ||
f4480240 | 347 | void unregister_blkdev(unsigned int major, const char *name) |
1da177e4 LT |
348 | { |
349 | struct blk_major_name **n; | |
350 | struct blk_major_name *p = NULL; | |
351 | int index = major_to_index(major); | |
1da177e4 | 352 | |
edfaa7c3 | 353 | mutex_lock(&block_class_lock); |
1da177e4 LT |
354 | for (n = &major_names[index]; *n; n = &(*n)->next) |
355 | if ((*n)->major == major) | |
356 | break; | |
294462a5 AM |
357 | if (!*n || strcmp((*n)->name, name)) { |
358 | WARN_ON(1); | |
294462a5 | 359 | } else { |
1da177e4 LT |
360 | p = *n; |
361 | *n = p->next; | |
362 | } | |
edfaa7c3 | 363 | mutex_unlock(&block_class_lock); |
1da177e4 | 364 | kfree(p); |
1da177e4 LT |
365 | } |
366 | ||
367 | EXPORT_SYMBOL(unregister_blkdev); | |
368 | ||
369 | static struct kobj_map *bdev_map; | |
370 | ||
870d6656 TH |
371 | /** |
372 | * blk_mangle_minor - scatter minor numbers apart | |
373 | * @minor: minor number to mangle | |
374 | * | |
375 | * Scatter consecutively allocated @minor number apart if MANGLE_DEVT | |
376 | * is enabled. Mangling twice gives the original value. | |
377 | * | |
378 | * RETURNS: | |
379 | * Mangled value. | |
380 | * | |
381 | * CONTEXT: | |
382 | * Don't care. | |
383 | */ | |
384 | static int blk_mangle_minor(int minor) | |
385 | { | |
386 | #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT | |
387 | int i; | |
388 | ||
389 | for (i = 0; i < MINORBITS / 2; i++) { | |
390 | int low = minor & (1 << i); | |
391 | int high = minor & (1 << (MINORBITS - 1 - i)); | |
392 | int distance = MINORBITS - 1 - 2 * i; | |
393 | ||
394 | minor ^= low | high; /* clear both bits */ | |
395 | low <<= distance; /* swap the positions */ | |
396 | high >>= distance; | |
397 | minor |= low | high; /* and set */ | |
398 | } | |
399 | #endif | |
400 | return minor; | |
401 | } | |
402 | ||
bcce3de1 TH |
403 | /** |
404 | * blk_alloc_devt - allocate a dev_t for a partition | |
405 | * @part: partition to allocate dev_t for | |
bcce3de1 TH |
406 | * @devt: out parameter for resulting dev_t |
407 | * | |
408 | * Allocate a dev_t for block device. | |
409 | * | |
410 | * RETURNS: | |
411 | * 0 on success, allocated dev_t is returned in *@devt. -errno on | |
412 | * failure. | |
413 | * | |
414 | * CONTEXT: | |
415 | * Might sleep. | |
416 | */ | |
417 | int blk_alloc_devt(struct hd_struct *part, dev_t *devt) | |
418 | { | |
419 | struct gendisk *disk = part_to_disk(part); | |
bab998d6 | 420 | int idx; |
bcce3de1 TH |
421 | |
422 | /* in consecutive minor range? */ | |
423 | if (part->partno < disk->minors) { | |
424 | *devt = MKDEV(disk->major, disk->first_minor + part->partno); | |
425 | return 0; | |
426 | } | |
427 | ||
428 | /* allocate ext devt */ | |
3710e26e KB |
429 | idr_preload(GFP_KERNEL); |
430 | ||
09dc9834 | 431 | spin_lock_bh(&ext_devt_lock); |
3710e26e | 432 | idx = idr_alloc(&ext_devt_idr, part, 0, NR_EXT_DEVT, GFP_NOWAIT); |
09dc9834 | 433 | spin_unlock_bh(&ext_devt_lock); |
3710e26e KB |
434 | |
435 | idr_preload_end(); | |
bab998d6 TH |
436 | if (idx < 0) |
437 | return idx == -ENOSPC ? -EBUSY : idx; | |
bcce3de1 | 438 | |
870d6656 | 439 | *devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx)); |
bcce3de1 TH |
440 | return 0; |
441 | } | |
442 | ||
443 | /** | |
444 | * blk_free_devt - free a dev_t | |
445 | * @devt: dev_t to free | |
446 | * | |
447 | * Free @devt which was allocated using blk_alloc_devt(). | |
448 | * | |
449 | * CONTEXT: | |
450 | * Might sleep. | |
451 | */ | |
452 | void blk_free_devt(dev_t devt) | |
453 | { | |
bcce3de1 TH |
454 | if (devt == MKDEV(0, 0)) |
455 | return; | |
456 | ||
457 | if (MAJOR(devt) == BLOCK_EXT_MAJOR) { | |
09dc9834 | 458 | spin_lock_bh(&ext_devt_lock); |
870d6656 | 459 | idr_remove(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
09dc9834 | 460 | spin_unlock_bh(&ext_devt_lock); |
bcce3de1 TH |
461 | } |
462 | } | |
463 | ||
1f014290 TH |
464 | static char *bdevt_str(dev_t devt, char *buf) |
465 | { | |
466 | if (MAJOR(devt) <= 0xff && MINOR(devt) <= 0xff) { | |
467 | char tbuf[BDEVT_SIZE]; | |
468 | snprintf(tbuf, BDEVT_SIZE, "%02x%02x", MAJOR(devt), MINOR(devt)); | |
469 | snprintf(buf, BDEVT_SIZE, "%-9s", tbuf); | |
470 | } else | |
471 | snprintf(buf, BDEVT_SIZE, "%03x:%05x", MAJOR(devt), MINOR(devt)); | |
472 | ||
473 | return buf; | |
474 | } | |
475 | ||
1da177e4 LT |
476 | /* |
477 | * Register device numbers dev..(dev+range-1) | |
478 | * range must be nonzero | |
479 | * The hash chain is sorted on range, so that subranges can override. | |
480 | */ | |
edfaa7c3 | 481 | void blk_register_region(dev_t devt, unsigned long range, struct module *module, |
1da177e4 LT |
482 | struct kobject *(*probe)(dev_t, int *, void *), |
483 | int (*lock)(dev_t, void *), void *data) | |
484 | { | |
edfaa7c3 | 485 | kobj_map(bdev_map, devt, range, module, probe, lock, data); |
1da177e4 LT |
486 | } |
487 | ||
488 | EXPORT_SYMBOL(blk_register_region); | |
489 | ||
edfaa7c3 | 490 | void blk_unregister_region(dev_t devt, unsigned long range) |
1da177e4 | 491 | { |
edfaa7c3 | 492 | kobj_unmap(bdev_map, devt, range); |
1da177e4 LT |
493 | } |
494 | ||
495 | EXPORT_SYMBOL(blk_unregister_region); | |
496 | ||
cf771cb5 | 497 | static struct kobject *exact_match(dev_t devt, int *partno, void *data) |
1da177e4 LT |
498 | { |
499 | struct gendisk *p = data; | |
edfaa7c3 | 500 | |
ed9e1982 | 501 | return &disk_to_dev(p)->kobj; |
1da177e4 LT |
502 | } |
503 | ||
edfaa7c3 | 504 | static int exact_lock(dev_t devt, void *data) |
1da177e4 LT |
505 | { |
506 | struct gendisk *p = data; | |
507 | ||
508 | if (!get_disk(p)) | |
509 | return -1; | |
510 | return 0; | |
511 | } | |
512 | ||
4752bc30 | 513 | static void register_disk(struct gendisk *disk) |
d2bf1b67 TH |
514 | { |
515 | struct device *ddev = disk_to_dev(disk); | |
516 | struct block_device *bdev; | |
517 | struct disk_part_iter piter; | |
518 | struct hd_struct *part; | |
519 | int err; | |
520 | ||
3c2a0909 S |
521 | #ifdef CONFIG_BLOCK_SUPPORT_STLOG |
522 | int major = disk->major; | |
523 | int first_minor = disk->first_minor; | |
524 | #endif | |
525 | ||
d2bf1b67 TH |
526 | ddev->parent = disk->driverfs_dev; |
527 | ||
88ce7cf7 | 528 | dev_set_name(ddev, "%s", disk->disk_name); |
d2bf1b67 TH |
529 | |
530 | /* delay uevents, until we scanned partition table */ | |
531 | dev_set_uevent_suppress(ddev, 1); | |
532 | ||
533 | if (device_add(ddev)) | |
534 | return; | |
535 | if (!sysfs_deprecated) { | |
536 | err = sysfs_create_link(block_depr, &ddev->kobj, | |
537 | kobject_name(&ddev->kobj)); | |
538 | if (err) { | |
539 | device_del(ddev); | |
540 | return; | |
541 | } | |
542 | } | |
25e823c8 ML |
543 | |
544 | /* | |
545 | * avoid probable deadlock caused by allocating memory with | |
546 | * GFP_KERNEL in runtime_resume callback of its all ancestor | |
547 | * devices | |
548 | */ | |
549 | pm_runtime_set_memalloc_noio(ddev, true); | |
550 | ||
d2bf1b67 TH |
551 | disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj); |
552 | disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj); | |
553 | ||
554 | /* No minors to use for partitions */ | |
d27769ec | 555 | if (!disk_part_scan_enabled(disk)) |
d2bf1b67 TH |
556 | goto exit; |
557 | ||
558 | /* No such device (e.g., media were just removed) */ | |
559 | if (!get_capacity(disk)) | |
560 | goto exit; | |
561 | ||
562 | bdev = bdget_disk(disk, 0); | |
563 | if (!bdev) | |
564 | goto exit; | |
565 | ||
566 | bdev->bd_invalidated = 1; | |
567 | err = blkdev_get(bdev, FMODE_READ, NULL); | |
568 | if (err < 0) | |
569 | goto exit; | |
570 | blkdev_put(bdev, FMODE_READ); | |
571 | ||
572 | exit: | |
573 | /* announce disk after possible partitions are created */ | |
574 | dev_set_uevent_suppress(ddev, 0); | |
575 | kobject_uevent(&ddev->kobj, KOBJ_ADD); | |
3c2a0909 | 576 | ST_LOG("<%s> KOBJ_ADD %d:%d", __func__, major, first_minor); |
d2bf1b67 TH |
577 | |
578 | /* announce possible partitions */ | |
579 | disk_part_iter_init(&piter, disk, 0); | |
3c2a0909 | 580 | while ((part = disk_part_iter_next(&piter))) { |
d2bf1b67 | 581 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD); |
3c2a0909 S |
582 | ST_LOG("<%s> KOBJ_ADD %d:%d", __func__, major, first_minor + part->partno); |
583 | } | |
d2bf1b67 TH |
584 | disk_part_iter_exit(&piter); |
585 | } | |
586 | ||
1da177e4 LT |
587 | /** |
588 | * add_disk - add partitioning information to kernel list | |
589 | * @disk: per-device partitioning information | |
590 | * | |
591 | * This function registers the partitioning information in @disk | |
592 | * with the kernel. | |
3e1a7ff8 TH |
593 | * |
594 | * FIXME: error handling | |
1da177e4 LT |
595 | */ |
596 | void add_disk(struct gendisk *disk) | |
597 | { | |
cf0ca9fe | 598 | struct backing_dev_info *bdi; |
3e1a7ff8 | 599 | dev_t devt; |
6ffeea77 | 600 | int retval; |
cf0ca9fe | 601 | |
3e1a7ff8 TH |
602 | /* minors == 0 indicates to use ext devt from part0 and should |
603 | * be accompanied with EXT_DEVT flag. Make sure all | |
604 | * parameters make sense. | |
605 | */ | |
606 | WARN_ON(disk->minors && !(disk->major || disk->first_minor)); | |
607 | WARN_ON(!disk->minors && !(disk->flags & GENHD_FL_EXT_DEVT)); | |
608 | ||
1da177e4 | 609 | disk->flags |= GENHD_FL_UP; |
3e1a7ff8 TH |
610 | |
611 | retval = blk_alloc_devt(&disk->part0, &devt); | |
612 | if (retval) { | |
613 | WARN_ON(1); | |
614 | return; | |
615 | } | |
616 | disk_to_dev(disk)->devt = devt; | |
617 | ||
618 | /* ->major and ->first_minor aren't supposed to be | |
619 | * dereferenced from here on, but set them just in case. | |
620 | */ | |
621 | disk->major = MAJOR(devt); | |
622 | disk->first_minor = MINOR(devt); | |
623 | ||
9f53d2fe SG |
624 | disk_alloc_events(disk); |
625 | ||
9f5e4865 | 626 | /* Register BDI before referencing it from bdev */ |
01ea5063 SJK |
627 | bdi = &disk->queue->backing_dev_info; |
628 | bdi_register_dev(bdi, disk_devt(disk)); | |
629 | ||
f331c029 TH |
630 | blk_register_region(disk_devt(disk), disk->minors, NULL, |
631 | exact_match, exact_lock, disk); | |
1da177e4 LT |
632 | register_disk(disk); |
633 | blk_register_queue(disk); | |
cf0ca9fe | 634 | |
523e1d39 TH |
635 | /* |
636 | * Take an extra ref on queue which will be put on disk_release() | |
637 | * so that it sticks around as long as @disk is there. | |
638 | */ | |
09ac46c4 | 639 | WARN_ON_ONCE(!blk_get_queue(disk->queue)); |
523e1d39 | 640 | |
ed9e1982 TH |
641 | retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj, |
642 | "bdi"); | |
6ffeea77 | 643 | WARN_ON(retval); |
1da177e4 | 644 | |
77ea887e | 645 | disk_add_events(disk); |
1da177e4 | 646 | } |
1da177e4 | 647 | EXPORT_SYMBOL(add_disk); |
1da177e4 | 648 | |
d2bf1b67 | 649 | void del_gendisk(struct gendisk *disk) |
1da177e4 | 650 | { |
d2bf1b67 TH |
651 | struct disk_part_iter piter; |
652 | struct hd_struct *part; | |
653 | ||
3c2a0909 S |
654 | #ifdef CONFIG_BLOCK_SUPPORT_STLOG |
655 | struct device *dev; | |
656 | #endif | |
657 | ||
77ea887e TH |
658 | disk_del_events(disk); |
659 | ||
d2bf1b67 TH |
660 | /* invalidate stuff */ |
661 | disk_part_iter_init(&piter, disk, | |
662 | DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE); | |
663 | while ((part = disk_part_iter_next(&piter))) { | |
664 | invalidate_partition(disk, part->partno); | |
665 | delete_partition(disk, part->partno); | |
666 | } | |
667 | disk_part_iter_exit(&piter); | |
668 | ||
669 | invalidate_partition(disk, 0); | |
d2bf1b67 TH |
670 | set_capacity(disk, 0); |
671 | disk->flags &= ~GENHD_FL_UP; | |
672 | ||
ed9e1982 | 673 | sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); |
cf0ca9fe | 674 | bdi_unregister(&disk->queue->backing_dev_info); |
1da177e4 | 675 | blk_unregister_queue(disk); |
f331c029 | 676 | blk_unregister_region(disk_devt(disk), disk->minors); |
d2bf1b67 TH |
677 | |
678 | part_stat_set_all(&disk->part0, 0); | |
679 | disk->part0.stamp = 0; | |
680 | ||
681 | kobject_put(disk->part0.holder_dir); | |
682 | kobject_put(disk->slave_dir); | |
d2bf1b67 TH |
683 | if (!sysfs_deprecated) |
684 | sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); | |
25e823c8 | 685 | pm_runtime_set_memalloc_noio(disk_to_dev(disk), false); |
3c2a0909 S |
686 | #ifdef CONFIG_BLOCK_SUPPORT_STLOG |
687 | dev = disk_to_dev(disk); | |
688 | ST_LOG("<%s> KOBJ_REMOVE %d:%d %s", | |
689 | __func__, MAJOR(dev->devt), MINOR(dev->devt), dev->kobj.name); | |
690 | #endif | |
691 | ||
d2bf1b67 | 692 | device_del(disk_to_dev(disk)); |
1da177e4 | 693 | } |
d2bf1b67 | 694 | EXPORT_SYMBOL(del_gendisk); |
1da177e4 | 695 | |
1da177e4 LT |
696 | /** |
697 | * get_gendisk - get partitioning information for a given device | |
710027a4 | 698 | * @devt: device to get partitioning information for |
496aa8a9 | 699 | * @partno: returned partition index |
1da177e4 LT |
700 | * |
701 | * This function gets the structure containing partitioning | |
710027a4 | 702 | * information for the given device @devt. |
1da177e4 | 703 | */ |
cf771cb5 | 704 | struct gendisk *get_gendisk(dev_t devt, int *partno) |
1da177e4 | 705 | { |
bcce3de1 TH |
706 | struct gendisk *disk = NULL; |
707 | ||
708 | if (MAJOR(devt) != BLOCK_EXT_MAJOR) { | |
709 | struct kobject *kobj; | |
710 | ||
711 | kobj = kobj_lookup(bdev_map, devt, partno); | |
712 | if (kobj) | |
713 | disk = dev_to_disk(kobj_to_dev(kobj)); | |
714 | } else { | |
715 | struct hd_struct *part; | |
716 | ||
09dc9834 | 717 | spin_lock_bh(&ext_devt_lock); |
870d6656 | 718 | part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
bcce3de1 TH |
719 | if (part && get_disk(part_to_disk(part))) { |
720 | *partno = part->partno; | |
721 | disk = part_to_disk(part); | |
722 | } | |
09dc9834 | 723 | spin_unlock_bh(&ext_devt_lock); |
bcce3de1 | 724 | } |
edfaa7c3 | 725 | |
bcce3de1 | 726 | return disk; |
1da177e4 | 727 | } |
b6ac23af | 728 | EXPORT_SYMBOL(get_gendisk); |
1da177e4 | 729 | |
f331c029 TH |
730 | /** |
731 | * bdget_disk - do bdget() by gendisk and partition number | |
732 | * @disk: gendisk of interest | |
733 | * @partno: partition number | |
734 | * | |
735 | * Find partition @partno from @disk, do bdget() on it. | |
736 | * | |
737 | * CONTEXT: | |
738 | * Don't care. | |
739 | * | |
740 | * RETURNS: | |
741 | * Resulting block_device on success, NULL on failure. | |
742 | */ | |
aeb3d3a8 | 743 | struct block_device *bdget_disk(struct gendisk *disk, int partno) |
f331c029 | 744 | { |
548b10eb TH |
745 | struct hd_struct *part; |
746 | struct block_device *bdev = NULL; | |
f331c029 | 747 | |
548b10eb | 748 | part = disk_get_part(disk, partno); |
2bbedcb4 | 749 | if (part) |
548b10eb TH |
750 | bdev = bdget(part_devt(part)); |
751 | disk_put_part(part); | |
f331c029 | 752 | |
548b10eb | 753 | return bdev; |
f331c029 TH |
754 | } |
755 | EXPORT_SYMBOL(bdget_disk); | |
756 | ||
5c6f35c5 GKH |
757 | /* |
758 | * print a full list of all partitions - intended for places where the root | |
759 | * filesystem can't be mounted and thus to give the victim some idea of what | |
760 | * went wrong | |
761 | */ | |
762 | void __init printk_all_partitions(void) | |
763 | { | |
def4e38d TH |
764 | struct class_dev_iter iter; |
765 | struct device *dev; | |
766 | ||
767 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); | |
768 | while ((dev = class_dev_iter_next(&iter))) { | |
769 | struct gendisk *disk = dev_to_disk(dev); | |
e71bf0d0 TH |
770 | struct disk_part_iter piter; |
771 | struct hd_struct *part; | |
1f014290 TH |
772 | char name_buf[BDEVNAME_SIZE]; |
773 | char devt_buf[BDEVT_SIZE]; | |
def4e38d TH |
774 | |
775 | /* | |
776 | * Don't show empty devices or things that have been | |
25985edc | 777 | * suppressed |
def4e38d TH |
778 | */ |
779 | if (get_capacity(disk) == 0 || | |
780 | (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) | |
781 | continue; | |
782 | ||
783 | /* | |
784 | * Note, unlike /proc/partitions, I am showing the | |
785 | * numbers in hex - the same format as the root= | |
786 | * option takes. | |
787 | */ | |
074a7aca TH |
788 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); |
789 | while ((part = disk_part_iter_next(&piter))) { | |
790 | bool is_part0 = part == &disk->part0; | |
def4e38d | 791 | |
b5af921e | 792 | printk("%s%s %10llu %s %s", is_part0 ? "" : " ", |
1f014290 | 793 | bdevt_str(part_devt(part), devt_buf), |
c83f6bf9 VG |
794 | (unsigned long long)part_nr_sects_read(part) >> 1 |
795 | , disk_name(disk, part->partno, name_buf), | |
1ad7e899 | 796 | part->info ? part->info->uuid : ""); |
074a7aca TH |
797 | if (is_part0) { |
798 | if (disk->driverfs_dev != NULL && | |
799 | disk->driverfs_dev->driver != NULL) | |
800 | printk(" driver: %s\n", | |
801 | disk->driverfs_dev->driver->name); | |
802 | else | |
803 | printk(" (driver?)\n"); | |
804 | } else | |
805 | printk("\n"); | |
806 | } | |
e71bf0d0 | 807 | disk_part_iter_exit(&piter); |
def4e38d TH |
808 | } |
809 | class_dev_iter_exit(&iter); | |
dd2a345f DG |
810 | } |
811 | ||
1da177e4 LT |
812 | #ifdef CONFIG_PROC_FS |
813 | /* iterator */ | |
def4e38d | 814 | static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
68c4d4a7 | 815 | { |
def4e38d TH |
816 | loff_t skip = *pos; |
817 | struct class_dev_iter *iter; | |
818 | struct device *dev; | |
68c4d4a7 | 819 | |
aeb3d3a8 | 820 | iter = kmalloc(sizeof(*iter), GFP_KERNEL); |
def4e38d TH |
821 | if (!iter) |
822 | return ERR_PTR(-ENOMEM); | |
823 | ||
824 | seqf->private = iter; | |
825 | class_dev_iter_init(iter, &block_class, NULL, &disk_type); | |
826 | do { | |
827 | dev = class_dev_iter_next(iter); | |
828 | if (!dev) | |
829 | return NULL; | |
830 | } while (skip--); | |
831 | ||
832 | return dev_to_disk(dev); | |
68c4d4a7 GKH |
833 | } |
834 | ||
def4e38d | 835 | static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
1da177e4 | 836 | { |
edfaa7c3 | 837 | struct device *dev; |
1da177e4 | 838 | |
def4e38d TH |
839 | (*pos)++; |
840 | dev = class_dev_iter_next(seqf->private); | |
2ac3cee5 | 841 | if (dev) |
68c4d4a7 | 842 | return dev_to_disk(dev); |
2ac3cee5 | 843 | |
1da177e4 LT |
844 | return NULL; |
845 | } | |
846 | ||
def4e38d | 847 | static void disk_seqf_stop(struct seq_file *seqf, void *v) |
27f30251 | 848 | { |
def4e38d | 849 | struct class_dev_iter *iter = seqf->private; |
27f30251 | 850 | |
def4e38d TH |
851 | /* stop is called even after start failed :-( */ |
852 | if (iter) { | |
853 | class_dev_iter_exit(iter); | |
854 | kfree(iter); | |
3c2a0909 | 855 | seqf->private = NULL; |
5c0ef6d0 | 856 | } |
1da177e4 LT |
857 | } |
858 | ||
def4e38d | 859 | static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
1da177e4 | 860 | { |
06768067 | 861 | void *p; |
def4e38d TH |
862 | |
863 | p = disk_seqf_start(seqf, pos); | |
b9f985b6 | 864 | if (!IS_ERR_OR_NULL(p) && !*pos) |
def4e38d TH |
865 | seq_puts(seqf, "major minor #blocks name\n\n"); |
866 | return p; | |
1da177e4 LT |
867 | } |
868 | ||
cf771cb5 | 869 | static int show_partition(struct seq_file *seqf, void *v) |
1da177e4 LT |
870 | { |
871 | struct gendisk *sgp = v; | |
e71bf0d0 TH |
872 | struct disk_part_iter piter; |
873 | struct hd_struct *part; | |
1da177e4 LT |
874 | char buf[BDEVNAME_SIZE]; |
875 | ||
1da177e4 | 876 | /* Don't show non-partitionable removeable devices or empty devices */ |
d27769ec | 877 | if (!get_capacity(sgp) || (!disk_max_parts(sgp) && |
f331c029 | 878 | (sgp->flags & GENHD_FL_REMOVABLE))) |
1da177e4 LT |
879 | return 0; |
880 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
881 | return 0; | |
882 | ||
883 | /* show the full disk and all non-0 size partitions of it */ | |
074a7aca | 884 | disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0); |
e71bf0d0 | 885 | while ((part = disk_part_iter_next(&piter))) |
1f014290 | 886 | seq_printf(seqf, "%4d %7d %10llu %s\n", |
f331c029 | 887 | MAJOR(part_devt(part)), MINOR(part_devt(part)), |
c83f6bf9 | 888 | (unsigned long long)part_nr_sects_read(part) >> 1, |
f331c029 | 889 | disk_name(sgp, part->partno, buf)); |
e71bf0d0 | 890 | disk_part_iter_exit(&piter); |
1da177e4 LT |
891 | |
892 | return 0; | |
893 | } | |
894 | ||
f500975a | 895 | static const struct seq_operations partitions_op = { |
def4e38d TH |
896 | .start = show_partition_start, |
897 | .next = disk_seqf_next, | |
898 | .stop = disk_seqf_stop, | |
edfaa7c3 | 899 | .show = show_partition |
1da177e4 | 900 | }; |
f500975a AD |
901 | |
902 | static int partitions_open(struct inode *inode, struct file *file) | |
903 | { | |
904 | return seq_open(file, &partitions_op); | |
905 | } | |
906 | ||
907 | static const struct file_operations proc_partitions_operations = { | |
908 | .open = partitions_open, | |
909 | .read = seq_read, | |
910 | .llseek = seq_lseek, | |
911 | .release = seq_release, | |
912 | }; | |
1da177e4 LT |
913 | #endif |
914 | ||
915 | ||
cf771cb5 | 916 | static struct kobject *base_probe(dev_t devt, int *partno, void *data) |
1da177e4 | 917 | { |
edfaa7c3 | 918 | if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
1da177e4 | 919 | /* Make old-style 2.4 aliases work */ |
edfaa7c3 | 920 | request_module("block-major-%d", MAJOR(devt)); |
1da177e4 LT |
921 | return NULL; |
922 | } | |
923 | ||
924 | static int __init genhd_device_init(void) | |
925 | { | |
e105b8bf DW |
926 | int error; |
927 | ||
928 | block_class.dev_kobj = sysfs_dev_block_kobj; | |
929 | error = class_register(&block_class); | |
ee27a558 RM |
930 | if (unlikely(error)) |
931 | return error; | |
edfaa7c3 | 932 | bdev_map = kobj_map_init(base_probe, &block_class_lock); |
1da177e4 | 933 | blk_dev_init(); |
edfaa7c3 | 934 | |
561ec68e ZY |
935 | register_blkdev(BLOCK_EXT_MAJOR, "blkext"); |
936 | ||
edfaa7c3 | 937 | /* create top-level block dir */ |
e52eec13 AK |
938 | if (!sysfs_deprecated) |
939 | block_depr = kobject_create_and_add("block", NULL); | |
830d3cfb | 940 | return 0; |
1da177e4 LT |
941 | } |
942 | ||
943 | subsys_initcall(genhd_device_init); | |
944 | ||
edfaa7c3 KS |
945 | static ssize_t disk_range_show(struct device *dev, |
946 | struct device_attribute *attr, char *buf) | |
1da177e4 | 947 | { |
edfaa7c3 | 948 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 949 | |
edfaa7c3 | 950 | return sprintf(buf, "%d\n", disk->minors); |
1da177e4 LT |
951 | } |
952 | ||
1f014290 TH |
953 | static ssize_t disk_ext_range_show(struct device *dev, |
954 | struct device_attribute *attr, char *buf) | |
955 | { | |
956 | struct gendisk *disk = dev_to_disk(dev); | |
957 | ||
b5d0b9df | 958 | return sprintf(buf, "%d\n", disk_max_parts(disk)); |
1f014290 TH |
959 | } |
960 | ||
edfaa7c3 KS |
961 | static ssize_t disk_removable_show(struct device *dev, |
962 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 963 | { |
edfaa7c3 | 964 | struct gendisk *disk = dev_to_disk(dev); |
a7fd6706 | 965 | |
edfaa7c3 KS |
966 | return sprintf(buf, "%d\n", |
967 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
a7fd6706 KS |
968 | } |
969 | ||
1c9ce527 KS |
970 | static ssize_t disk_ro_show(struct device *dev, |
971 | struct device_attribute *attr, char *buf) | |
972 | { | |
973 | struct gendisk *disk = dev_to_disk(dev); | |
974 | ||
b7db9956 | 975 | return sprintf(buf, "%d\n", get_disk_ro(disk) ? 1 : 0); |
1c9ce527 KS |
976 | } |
977 | ||
edfaa7c3 KS |
978 | static ssize_t disk_capability_show(struct device *dev, |
979 | struct device_attribute *attr, char *buf) | |
86ce18d7 | 980 | { |
edfaa7c3 KS |
981 | struct gendisk *disk = dev_to_disk(dev); |
982 | ||
983 | return sprintf(buf, "%x\n", disk->flags); | |
86ce18d7 | 984 | } |
edfaa7c3 | 985 | |
c72758f3 MP |
986 | static ssize_t disk_alignment_offset_show(struct device *dev, |
987 | struct device_attribute *attr, | |
988 | char *buf) | |
989 | { | |
990 | struct gendisk *disk = dev_to_disk(dev); | |
991 | ||
992 | return sprintf(buf, "%d\n", queue_alignment_offset(disk->queue)); | |
993 | } | |
994 | ||
86b37281 MP |
995 | static ssize_t disk_discard_alignment_show(struct device *dev, |
996 | struct device_attribute *attr, | |
997 | char *buf) | |
998 | { | |
999 | struct gendisk *disk = dev_to_disk(dev); | |
1000 | ||
dd3d145d | 1001 | return sprintf(buf, "%d\n", queue_discard_alignment(disk->queue)); |
86b37281 MP |
1002 | } |
1003 | ||
edfaa7c3 | 1004 | static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); |
1f014290 | 1005 | static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL); |
edfaa7c3 | 1006 | static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); |
1c9ce527 | 1007 | static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); |
e5610521 | 1008 | static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); |
c72758f3 | 1009 | static DEVICE_ATTR(alignment_offset, S_IRUGO, disk_alignment_offset_show, NULL); |
86b37281 MP |
1010 | static DEVICE_ATTR(discard_alignment, S_IRUGO, disk_discard_alignment_show, |
1011 | NULL); | |
edfaa7c3 | 1012 | static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); |
074a7aca | 1013 | static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); |
316d315b | 1014 | static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL); |
c17bb495 | 1015 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 | 1016 | static struct device_attribute dev_attr_fail = |
eddb2e26 | 1017 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); |
c17bb495 | 1018 | #endif |
581d4e28 JA |
1019 | #ifdef CONFIG_FAIL_IO_TIMEOUT |
1020 | static struct device_attribute dev_attr_fail_timeout = | |
1021 | __ATTR(io-timeout-fail, S_IRUGO|S_IWUSR, part_timeout_show, | |
1022 | part_timeout_store); | |
1023 | #endif | |
edfaa7c3 KS |
1024 | |
1025 | static struct attribute *disk_attrs[] = { | |
1026 | &dev_attr_range.attr, | |
1f014290 | 1027 | &dev_attr_ext_range.attr, |
edfaa7c3 | 1028 | &dev_attr_removable.attr, |
1c9ce527 | 1029 | &dev_attr_ro.attr, |
edfaa7c3 | 1030 | &dev_attr_size.attr, |
c72758f3 | 1031 | &dev_attr_alignment_offset.attr, |
86b37281 | 1032 | &dev_attr_discard_alignment.attr, |
edfaa7c3 KS |
1033 | &dev_attr_capability.attr, |
1034 | &dev_attr_stat.attr, | |
316d315b | 1035 | &dev_attr_inflight.attr, |
edfaa7c3 KS |
1036 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
1037 | &dev_attr_fail.attr, | |
581d4e28 JA |
1038 | #endif |
1039 | #ifdef CONFIG_FAIL_IO_TIMEOUT | |
1040 | &dev_attr_fail_timeout.attr, | |
edfaa7c3 KS |
1041 | #endif |
1042 | NULL | |
1043 | }; | |
1044 | ||
1045 | static struct attribute_group disk_attr_group = { | |
1046 | .attrs = disk_attrs, | |
1047 | }; | |
1048 | ||
a4dbd674 | 1049 | static const struct attribute_group *disk_attr_groups[] = { |
edfaa7c3 KS |
1050 | &disk_attr_group, |
1051 | NULL | |
1da177e4 LT |
1052 | }; |
1053 | ||
540eed56 TH |
1054 | /** |
1055 | * disk_replace_part_tbl - replace disk->part_tbl in RCU-safe way | |
1056 | * @disk: disk to replace part_tbl for | |
1057 | * @new_ptbl: new part_tbl to install | |
1058 | * | |
1059 | * Replace disk->part_tbl with @new_ptbl in RCU-safe way. The | |
1060 | * original ptbl is freed using RCU callback. | |
1061 | * | |
1062 | * LOCKING: | |
1063 | * Matching bd_mutx locked. | |
1064 | */ | |
1065 | static void disk_replace_part_tbl(struct gendisk *disk, | |
1066 | struct disk_part_tbl *new_ptbl) | |
1067 | { | |
1068 | struct disk_part_tbl *old_ptbl = disk->part_tbl; | |
1069 | ||
1070 | rcu_assign_pointer(disk->part_tbl, new_ptbl); | |
a6f23657 JA |
1071 | |
1072 | if (old_ptbl) { | |
1073 | rcu_assign_pointer(old_ptbl->last_lookup, NULL); | |
57bdfbf9 | 1074 | kfree_rcu(old_ptbl, rcu_head); |
a6f23657 | 1075 | } |
540eed56 TH |
1076 | } |
1077 | ||
1078 | /** | |
1079 | * disk_expand_part_tbl - expand disk->part_tbl | |
1080 | * @disk: disk to expand part_tbl for | |
1081 | * @partno: expand such that this partno can fit in | |
1082 | * | |
1083 | * Expand disk->part_tbl such that @partno can fit in. disk->part_tbl | |
1084 | * uses RCU to allow unlocked dereferencing for stats and other stuff. | |
1085 | * | |
1086 | * LOCKING: | |
1087 | * Matching bd_mutex locked, might sleep. | |
1088 | * | |
1089 | * RETURNS: | |
1090 | * 0 on success, -errno on failure. | |
1091 | */ | |
1092 | int disk_expand_part_tbl(struct gendisk *disk, int partno) | |
1093 | { | |
1094 | struct disk_part_tbl *old_ptbl = disk->part_tbl; | |
1095 | struct disk_part_tbl *new_ptbl; | |
1096 | int len = old_ptbl ? old_ptbl->len : 0; | |
89b0c47f | 1097 | int i, target; |
540eed56 | 1098 | size_t size; |
89b0c47f JA |
1099 | |
1100 | /* | |
1101 | * check for int overflow, since we can get here from blkpg_ioctl() | |
1102 | * with a user passed 'partno'. | |
1103 | */ | |
1104 | target = partno + 1; | |
1105 | if (target < 0) | |
1106 | return -EINVAL; | |
540eed56 TH |
1107 | |
1108 | /* disk_max_parts() is zero during initialization, ignore if so */ | |
1109 | if (disk_max_parts(disk) && target > disk_max_parts(disk)) | |
1110 | return -EINVAL; | |
1111 | ||
1112 | if (target <= len) | |
1113 | return 0; | |
1114 | ||
1115 | size = sizeof(*new_ptbl) + target * sizeof(new_ptbl->part[0]); | |
1116 | new_ptbl = kzalloc_node(size, GFP_KERNEL, disk->node_id); | |
1117 | if (!new_ptbl) | |
1118 | return -ENOMEM; | |
1119 | ||
540eed56 TH |
1120 | new_ptbl->len = target; |
1121 | ||
1122 | for (i = 0; i < len; i++) | |
1123 | rcu_assign_pointer(new_ptbl->part[i], old_ptbl->part[i]); | |
1124 | ||
1125 | disk_replace_part_tbl(disk, new_ptbl); | |
1126 | return 0; | |
1127 | } | |
1128 | ||
edfaa7c3 | 1129 | static void disk_release(struct device *dev) |
1da177e4 | 1130 | { |
edfaa7c3 KS |
1131 | struct gendisk *disk = dev_to_disk(dev); |
1132 | ||
3710e26e | 1133 | blk_free_devt(dev->devt); |
77ea887e | 1134 | disk_release_events(disk); |
1da177e4 | 1135 | kfree(disk->random); |
540eed56 | 1136 | disk_replace_part_tbl(disk, NULL); |
074a7aca | 1137 | free_part_stats(&disk->part0); |
6d1d8050 | 1138 | free_part_info(&disk->part0); |
523e1d39 TH |
1139 | if (disk->queue) |
1140 | blk_put_queue(disk->queue); | |
1da177e4 LT |
1141 | kfree(disk); |
1142 | } | |
3c2a0909 S |
1143 | |
1144 | static int disk_uevent(struct device *dev, struct kobj_uevent_env *env) | |
1145 | { | |
1146 | struct gendisk *disk = dev_to_disk(dev); | |
1147 | struct disk_part_iter piter; | |
1148 | struct hd_struct *part; | |
1149 | int cnt = 0; | |
1150 | ||
1151 | disk_part_iter_init(&piter, disk, 0); | |
1152 | while((part = disk_part_iter_next(&piter))) | |
1153 | cnt++; | |
1154 | disk_part_iter_exit(&piter); | |
1155 | add_uevent_var(env, "NPARTS=%u", cnt); | |
1156 | #ifdef CONFIG_USB_STORAGE_DETECT | |
1157 | if (disk->flags & GENHD_FL_IF_USB) { | |
1158 | add_uevent_var(env, "MEDIAPRST=%d", | |
1159 | (disk->flags & GENHD_FL_MEDIA_PRESENT) ? 1 : 0); | |
1160 | pr_info("%s %d, disk flag media_present=%d, cnt=%d\n", | |
1161 | __func__, __LINE__, | |
1162 | (disk->flags & GENHD_FL_MEDIA_PRESENT), cnt); | |
1163 | } | |
1164 | #endif | |
1165 | return 0; | |
1166 | } | |
1167 | ||
edfaa7c3 KS |
1168 | struct class block_class = { |
1169 | .name = "block", | |
1da177e4 LT |
1170 | }; |
1171 | ||
3c2670e6 | 1172 | static char *block_devnode(struct device *dev, umode_t *mode, |
4e4098a3 | 1173 | kuid_t *uid, kgid_t *gid) |
b03f38b6 KS |
1174 | { |
1175 | struct gendisk *disk = dev_to_disk(dev); | |
1176 | ||
e454cea2 KS |
1177 | if (disk->devnode) |
1178 | return disk->devnode(disk, mode); | |
b03f38b6 KS |
1179 | return NULL; |
1180 | } | |
1181 | ||
1826eadf | 1182 | static struct device_type disk_type = { |
edfaa7c3 KS |
1183 | .name = "disk", |
1184 | .groups = disk_attr_groups, | |
1185 | .release = disk_release, | |
e454cea2 | 1186 | .devnode = block_devnode, |
3c2a0909 | 1187 | .uevent = disk_uevent, |
1da177e4 LT |
1188 | }; |
1189 | ||
a6e2ba88 | 1190 | #ifdef CONFIG_PROC_FS |
cf771cb5 TH |
1191 | /* |
1192 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
1193 | * entries do, above, but makes them available through one seq_file. | |
1194 | * | |
1195 | * The output looks suspiciously like /proc/partitions with a bunch of | |
1196 | * extra fields. | |
1197 | */ | |
1198 | static int diskstats_show(struct seq_file *seqf, void *v) | |
1da177e4 LT |
1199 | { |
1200 | struct gendisk *gp = v; | |
e71bf0d0 TH |
1201 | struct disk_part_iter piter; |
1202 | struct hd_struct *hd; | |
1da177e4 | 1203 | char buf[BDEVNAME_SIZE]; |
c9959059 | 1204 | int cpu; |
1da177e4 LT |
1205 | |
1206 | /* | |
ed9e1982 | 1207 | if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) |
cf771cb5 | 1208 | seq_puts(seqf, "major minor name" |
1da177e4 LT |
1209 | " rio rmerge rsect ruse wio wmerge " |
1210 | "wsect wuse running use aveq" | |
1211 | "\n\n"); | |
1212 | */ | |
9f5e4865 | 1213 | |
71982a40 | 1214 | disk_part_iter_init(&piter, gp, DISK_PITER_INCL_EMPTY_PART0); |
e71bf0d0 | 1215 | while ((hd = disk_part_iter_next(&piter))) { |
074a7aca | 1216 | cpu = part_stat_lock(); |
c9959059 | 1217 | part_round_stats(cpu, hd); |
074a7aca | 1218 | part_stat_unlock(); |
f95fe9cf HP |
1219 | seq_printf(seqf, "%4d %7d %s %lu %lu %lu " |
1220 | "%u %lu %lu %lu %u %u %u %u\n", | |
f331c029 TH |
1221 | MAJOR(part_devt(hd)), MINOR(part_devt(hd)), |
1222 | disk_name(gp, hd->partno, buf), | |
53f22956 LY |
1223 | part_stat_read(hd, ios[READ]), |
1224 | part_stat_read(hd, merges[READ]), | |
f95fe9cf | 1225 | part_stat_read(hd, sectors[READ]), |
53f22956 LY |
1226 | jiffies_to_msecs(part_stat_read(hd, ticks[READ])), |
1227 | part_stat_read(hd, ios[WRITE]), | |
1228 | part_stat_read(hd, merges[WRITE]), | |
f95fe9cf | 1229 | part_stat_read(hd, sectors[WRITE]), |
53f22956 | 1230 | jiffies_to_msecs(part_stat_read(hd, ticks[WRITE])), |
316d315b | 1231 | part_in_flight(hd), |
28f39d55 JM |
1232 | jiffies_to_msecs(part_stat_read(hd, io_ticks)), |
1233 | jiffies_to_msecs(part_stat_read(hd, time_in_queue)) | |
1234 | ); | |
1da177e4 | 1235 | } |
e71bf0d0 | 1236 | disk_part_iter_exit(&piter); |
9f5e4865 | 1237 | |
1da177e4 LT |
1238 | return 0; |
1239 | } | |
1240 | ||
31d85ab2 | 1241 | static const struct seq_operations diskstats_op = { |
def4e38d TH |
1242 | .start = disk_seqf_start, |
1243 | .next = disk_seqf_next, | |
1244 | .stop = disk_seqf_stop, | |
1da177e4 LT |
1245 | .show = diskstats_show |
1246 | }; | |
f500975a | 1247 | |
31d85ab2 AD |
1248 | static int diskstats_open(struct inode *inode, struct file *file) |
1249 | { | |
1250 | return seq_open(file, &diskstats_op); | |
1251 | } | |
1252 | ||
1253 | static const struct file_operations proc_diskstats_operations = { | |
1254 | .open = diskstats_open, | |
1255 | .read = seq_read, | |
1256 | .llseek = seq_lseek, | |
1257 | .release = seq_release, | |
1258 | }; | |
1259 | ||
3c2a0909 S |
1260 | #define PG2KB(x) ((unsigned long)((x) << (PAGE_SHIFT - 10))) |
1261 | static int iostats_show(struct seq_file *seqf, void *v) | |
1262 | { | |
1263 | struct gendisk *gp = v; | |
1264 | struct disk_part_iter piter; | |
1265 | struct hd_struct *hd; | |
1266 | char buf[BDEVNAME_SIZE]; | |
1267 | int cpu; | |
1268 | u64 uptime; | |
1269 | unsigned long thresh = 0; | |
1270 | unsigned long bg_thresh = 0; | |
1271 | struct backing_dev_info *bdi; | |
1272 | unsigned int nread, nwrite; | |
1273 | ||
1274 | /* Enhanced diskstats for IOD V 2.2 */ | |
1275 | global_dirty_limits(&bg_thresh, &thresh); | |
1276 | ||
1277 | disk_part_iter_init(&piter, gp, DISK_PITER_INCL_EMPTY_PART0); | |
1278 | while ((hd = disk_part_iter_next(&piter))) { | |
1279 | cpu = part_stat_lock(); | |
1280 | part_round_stats(cpu, hd); | |
1281 | part_stat_unlock(); | |
1282 | uptime = ktime_to_ns(ktime_get()); | |
1283 | uptime /= 1000000; /* in ms */ | |
1284 | bdi = &gp->queue->backing_dev_info; | |
1285 | nread = part_in_flight_read(hd); | |
1286 | nwrite = part_in_flight_write(hd); | |
1287 | seq_printf(seqf, "%4d %7d %s %lu %lu %lu %u " | |
1288 | "%lu %lu %lu %u %u %u %u " | |
1289 | /* added */ | |
1290 | "%lu %lu %lu %lu " | |
1291 | "%u %llu %lu %lu %lu %u " | |
1292 | "%lu.%03lu\n", | |
1293 | MAJOR(part_devt(hd)), MINOR(part_devt(hd)), | |
1294 | disk_name(gp, hd->partno, buf), | |
1295 | part_stat_read(hd, ios[READ]), | |
1296 | part_stat_read(hd, merges[READ]), | |
1297 | part_stat_read(hd, sectors[READ]), | |
1298 | jiffies_to_msecs(part_stat_read(hd, ticks[READ])), | |
1299 | ||
1300 | part_stat_read(hd, ios[WRITE]), | |
1301 | part_stat_read(hd, merges[WRITE]), | |
1302 | part_stat_read(hd, sectors[WRITE]), | |
1303 | jiffies_to_msecs(part_stat_read(hd, ticks[WRITE])), | |
1304 | /*part_in_flight(hd),*/ | |
1305 | nread + nwrite, | |
1306 | jiffies_to_msecs(part_stat_read(hd, io_ticks)), | |
1307 | jiffies_to_msecs(part_stat_read(hd, time_in_queue)), | |
1308 | /* followings are added */ | |
1309 | part_stat_read(hd, discard_ios), | |
1310 | part_stat_read(hd, discard_sectors), | |
1311 | part_stat_read(hd, flush_ios), | |
1312 | gp->queue->flush_ios, | |
1313 | ||
1314 | nread, | |
1315 | gp->queue->in_flight_time / USEC_PER_MSEC, | |
1316 | PG2KB(thresh), | |
1317 | PG2KB(bdi->last_thresh), | |
1318 | PG2KB(bdi->last_nr_dirty), | |
1319 | jiffies_to_msecs(bdi->paused_total), | |
1320 | ||
1321 | (unsigned long)(uptime / 1000), | |
1322 | (unsigned long)(uptime % 1000) | |
1323 | ); | |
1324 | } | |
1325 | disk_part_iter_exit(&piter); | |
1326 | ||
1327 | return 0; | |
1328 | } | |
1329 | ||
1330 | static const struct seq_operations iostats_op = { | |
1331 | .start = disk_seqf_start, | |
1332 | .next = disk_seqf_next, | |
1333 | .stop = disk_seqf_stop, | |
1334 | .show = iostats_show | |
1335 | }; | |
1336 | ||
1337 | static int iostats_open(struct inode *inode, struct file *file) | |
1338 | { | |
1339 | return seq_open(file, &iostats_op); | |
1340 | } | |
1341 | ||
1342 | static const struct file_operations proc_iostats_operations = { | |
1343 | .open = iostats_open, | |
1344 | .read = seq_read, | |
1345 | .llseek = seq_lseek, | |
1346 | .release = seq_release, | |
1347 | }; | |
1348 | ||
f500975a AD |
1349 | static int __init proc_genhd_init(void) |
1350 | { | |
3c2a0909 | 1351 | proc_create("iostats", 0, NULL, &proc_iostats_operations); |
31d85ab2 | 1352 | proc_create("diskstats", 0, NULL, &proc_diskstats_operations); |
f500975a AD |
1353 | proc_create("partitions", 0, NULL, &proc_partitions_operations); |
1354 | return 0; | |
1355 | } | |
1356 | module_init(proc_genhd_init); | |
a6e2ba88 | 1357 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 1358 | |
cf771cb5 | 1359 | dev_t blk_lookup_devt(const char *name, int partno) |
a142be85 | 1360 | { |
def4e38d TH |
1361 | dev_t devt = MKDEV(0, 0); |
1362 | struct class_dev_iter iter; | |
1363 | struct device *dev; | |
a142be85 | 1364 | |
def4e38d TH |
1365 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); |
1366 | while ((dev = class_dev_iter_next(&iter))) { | |
a142be85 | 1367 | struct gendisk *disk = dev_to_disk(dev); |
548b10eb | 1368 | struct hd_struct *part; |
a142be85 | 1369 | |
3ada8b7e | 1370 | if (strcmp(dev_name(dev), name)) |
f331c029 | 1371 | continue; |
f331c029 | 1372 | |
41b8c853 NB |
1373 | if (partno < disk->minors) { |
1374 | /* We need to return the right devno, even | |
1375 | * if the partition doesn't exist yet. | |
1376 | */ | |
1377 | devt = MKDEV(MAJOR(dev->devt), | |
1378 | MINOR(dev->devt) + partno); | |
1379 | break; | |
1380 | } | |
548b10eb | 1381 | part = disk_get_part(disk, partno); |
2bbedcb4 | 1382 | if (part) { |
f331c029 | 1383 | devt = part_devt(part); |
e71bf0d0 | 1384 | disk_put_part(part); |
548b10eb | 1385 | break; |
def4e38d | 1386 | } |
548b10eb | 1387 | disk_put_part(part); |
5c0ef6d0 | 1388 | } |
def4e38d | 1389 | class_dev_iter_exit(&iter); |
edfaa7c3 KS |
1390 | return devt; |
1391 | } | |
edfaa7c3 KS |
1392 | EXPORT_SYMBOL(blk_lookup_devt); |
1393 | ||
1da177e4 LT |
1394 | struct gendisk *alloc_disk(int minors) |
1395 | { | |
c304a51b | 1396 | return alloc_disk_node(minors, NUMA_NO_NODE); |
1946089a | 1397 | } |
689d6fac | 1398 | EXPORT_SYMBOL(alloc_disk); |
1946089a CL |
1399 | |
1400 | struct gendisk *alloc_disk_node(int minors, int node_id) | |
1401 | { | |
1402 | struct gendisk *disk; | |
1403 | ||
94f6030c CL |
1404 | disk = kmalloc_node(sizeof(struct gendisk), |
1405 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 1406 | if (disk) { |
074a7aca | 1407 | if (!init_part_stats(&disk->part0)) { |
1da177e4 LT |
1408 | kfree(disk); |
1409 | return NULL; | |
1410 | } | |
bf91db18 | 1411 | disk->node_id = node_id; |
540eed56 TH |
1412 | if (disk_expand_part_tbl(disk, 0)) { |
1413 | free_part_stats(&disk->part0); | |
b5d0b9df TH |
1414 | kfree(disk); |
1415 | return NULL; | |
1da177e4 | 1416 | } |
540eed56 | 1417 | disk->part_tbl->part[0] = &disk->part0; |
6c23a968 | 1418 | |
c83f6bf9 VG |
1419 | /* |
1420 | * set_capacity() and get_capacity() currently don't use | |
1421 | * seqcounter to read/update the part0->nr_sects. Still init | |
1422 | * the counter as we can read the sectors in IO submission | |
1423 | * patch using seqence counters. | |
1424 | * | |
1425 | * TODO: Ideally set_capacity() and get_capacity() should be | |
1426 | * converted to make use of bd_mutex and sequence counters. | |
1427 | */ | |
1428 | seqcount_init(&disk->part0.nr_sects_seq); | |
6c23a968 | 1429 | hd_ref_init(&disk->part0); |
b5d0b9df | 1430 | |
1da177e4 | 1431 | disk->minors = minors; |
1da177e4 | 1432 | rand_initialize_disk(disk); |
ed9e1982 TH |
1433 | disk_to_dev(disk)->class = &block_class; |
1434 | disk_to_dev(disk)->type = &disk_type; | |
1435 | device_initialize(disk_to_dev(disk)); | |
1da177e4 LT |
1436 | } |
1437 | return disk; | |
1438 | } | |
1946089a | 1439 | EXPORT_SYMBOL(alloc_disk_node); |
1da177e4 LT |
1440 | |
1441 | struct kobject *get_disk(struct gendisk *disk) | |
1442 | { | |
1443 | struct module *owner; | |
1444 | struct kobject *kobj; | |
1445 | ||
1446 | if (!disk->fops) | |
1447 | return NULL; | |
1448 | owner = disk->fops->owner; | |
1449 | if (owner && !try_module_get(owner)) | |
1450 | return NULL; | |
ed9e1982 | 1451 | kobj = kobject_get(&disk_to_dev(disk)->kobj); |
1da177e4 LT |
1452 | if (kobj == NULL) { |
1453 | module_put(owner); | |
1454 | return NULL; | |
1455 | } | |
1456 | return kobj; | |
1457 | ||
1458 | } | |
1459 | ||
1460 | EXPORT_SYMBOL(get_disk); | |
1461 | ||
1462 | void put_disk(struct gendisk *disk) | |
1463 | { | |
1464 | if (disk) | |
ed9e1982 | 1465 | kobject_put(&disk_to_dev(disk)->kobj); |
1da177e4 LT |
1466 | } |
1467 | ||
1468 | EXPORT_SYMBOL(put_disk); | |
1469 | ||
e3264a4d HR |
1470 | static void set_disk_ro_uevent(struct gendisk *gd, int ro) |
1471 | { | |
1472 | char event[] = "DISK_RO=1"; | |
1473 | char *envp[] = { event, NULL }; | |
1474 | ||
1475 | if (!ro) | |
1476 | event[8] = '0'; | |
1477 | kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp); | |
1478 | } | |
1479 | ||
1da177e4 LT |
1480 | void set_device_ro(struct block_device *bdev, int flag) |
1481 | { | |
b7db9956 | 1482 | bdev->bd_part->policy = flag; |
1da177e4 LT |
1483 | } |
1484 | ||
1485 | EXPORT_SYMBOL(set_device_ro); | |
1486 | ||
1487 | void set_disk_ro(struct gendisk *disk, int flag) | |
1488 | { | |
e71bf0d0 TH |
1489 | struct disk_part_iter piter; |
1490 | struct hd_struct *part; | |
1491 | ||
e3264a4d HR |
1492 | if (disk->part0.policy != flag) { |
1493 | set_disk_ro_uevent(disk, flag); | |
1494 | disk->part0.policy = flag; | |
1495 | } | |
1496 | ||
1497 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); | |
e71bf0d0 TH |
1498 | while ((part = disk_part_iter_next(&piter))) |
1499 | part->policy = flag; | |
1500 | disk_part_iter_exit(&piter); | |
1da177e4 LT |
1501 | } |
1502 | ||
1503 | EXPORT_SYMBOL(set_disk_ro); | |
1504 | ||
1505 | int bdev_read_only(struct block_device *bdev) | |
1506 | { | |
1507 | if (!bdev) | |
1508 | return 0; | |
b7db9956 | 1509 | return bdev->bd_part->policy; |
1da177e4 LT |
1510 | } |
1511 | ||
1512 | EXPORT_SYMBOL(bdev_read_only); | |
1513 | ||
cf771cb5 | 1514 | int invalidate_partition(struct gendisk *disk, int partno) |
1da177e4 LT |
1515 | { |
1516 | int res = 0; | |
cf771cb5 | 1517 | struct block_device *bdev = bdget_disk(disk, partno); |
1da177e4 | 1518 | if (bdev) { |
2ef41634 | 1519 | fsync_bdev(bdev); |
93b270f7 | 1520 | res = __invalidate_device(bdev, true); |
1da177e4 LT |
1521 | bdput(bdev); |
1522 | } | |
1523 | return res; | |
1524 | } | |
1525 | ||
1526 | EXPORT_SYMBOL(invalidate_partition); | |
77ea887e TH |
1527 | |
1528 | /* | |
1529 | * Disk events - monitor disk events like media change and eject request. | |
1530 | */ | |
1531 | struct disk_events { | |
1532 | struct list_head node; /* all disk_event's */ | |
1533 | struct gendisk *disk; /* the associated disk */ | |
1534 | spinlock_t lock; | |
1535 | ||
fdd514e1 | 1536 | struct mutex block_mutex; /* protects blocking */ |
77ea887e TH |
1537 | int block; /* event blocking depth */ |
1538 | unsigned int pending; /* events already sent out */ | |
1539 | unsigned int clearing; /* events being cleared */ | |
1540 | ||
1541 | long poll_msecs; /* interval, -1 for default */ | |
1542 | struct delayed_work dwork; | |
1543 | }; | |
1544 | ||
1545 | static const char *disk_events_strs[] = { | |
1546 | [ilog2(DISK_EVENT_MEDIA_CHANGE)] = "media_change", | |
1547 | [ilog2(DISK_EVENT_EJECT_REQUEST)] = "eject_request", | |
1548 | }; | |
1549 | ||
1550 | static char *disk_uevents[] = { | |
1551 | [ilog2(DISK_EVENT_MEDIA_CHANGE)] = "DISK_MEDIA_CHANGE=1", | |
1552 | [ilog2(DISK_EVENT_EJECT_REQUEST)] = "DISK_EJECT_REQUEST=1", | |
1553 | }; | |
1554 | ||
1555 | /* list of all disk_events */ | |
1556 | static DEFINE_MUTEX(disk_events_mutex); | |
1557 | static LIST_HEAD(disk_events); | |
1558 | ||
1559 | /* disable in-kernel polling by default */ | |
1560 | static unsigned long disk_events_dfl_poll_msecs = 0; | |
1561 | ||
1562 | static unsigned long disk_events_poll_jiffies(struct gendisk *disk) | |
1563 | { | |
1564 | struct disk_events *ev = disk->ev; | |
1565 | long intv_msecs = 0; | |
1566 | ||
1567 | /* | |
1568 | * If device-specific poll interval is set, always use it. If | |
1569 | * the default is being used, poll iff there are events which | |
1570 | * can't be monitored asynchronously. | |
1571 | */ | |
1572 | if (ev->poll_msecs >= 0) | |
1573 | intv_msecs = ev->poll_msecs; | |
1574 | else if (disk->events & ~disk->async_events) | |
1575 | intv_msecs = disk_events_dfl_poll_msecs; | |
1576 | ||
1577 | return msecs_to_jiffies(intv_msecs); | |
1578 | } | |
1579 | ||
c3af54af TH |
1580 | /** |
1581 | * disk_block_events - block and flush disk event checking | |
1582 | * @disk: disk to block events for | |
1583 | * | |
1584 | * On return from this function, it is guaranteed that event checking | |
1585 | * isn't in progress and won't happen until unblocked by | |
1586 | * disk_unblock_events(). Events blocking is counted and the actual | |
1587 | * unblocking happens after the matching number of unblocks are done. | |
1588 | * | |
1589 | * Note that this intentionally does not block event checking from | |
1590 | * disk_clear_events(). | |
1591 | * | |
1592 | * CONTEXT: | |
1593 | * Might sleep. | |
1594 | */ | |
1595 | void disk_block_events(struct gendisk *disk) | |
77ea887e TH |
1596 | { |
1597 | struct disk_events *ev = disk->ev; | |
1598 | unsigned long flags; | |
1599 | bool cancel; | |
1600 | ||
c3af54af TH |
1601 | if (!ev) |
1602 | return; | |
1603 | ||
fdd514e1 TH |
1604 | /* |
1605 | * Outer mutex ensures that the first blocker completes canceling | |
1606 | * the event work before further blockers are allowed to finish. | |
1607 | */ | |
1608 | mutex_lock(&ev->block_mutex); | |
1609 | ||
77ea887e TH |
1610 | spin_lock_irqsave(&ev->lock, flags); |
1611 | cancel = !ev->block++; | |
1612 | spin_unlock_irqrestore(&ev->lock, flags); | |
1613 | ||
c3af54af TH |
1614 | if (cancel) |
1615 | cancel_delayed_work_sync(&disk->ev->dwork); | |
fdd514e1 TH |
1616 | |
1617 | mutex_unlock(&ev->block_mutex); | |
77ea887e TH |
1618 | } |
1619 | ||
1620 | static void __disk_unblock_events(struct gendisk *disk, bool check_now) | |
1621 | { | |
1622 | struct disk_events *ev = disk->ev; | |
1623 | unsigned long intv; | |
1624 | unsigned long flags; | |
1625 | ||
1626 | spin_lock_irqsave(&ev->lock, flags); | |
1627 | ||
1628 | if (WARN_ON_ONCE(ev->block <= 0)) | |
1629 | goto out_unlock; | |
1630 | ||
1631 | if (--ev->block) | |
1632 | goto out_unlock; | |
1633 | ||
1634 | /* | |
1635 | * Not exactly a latency critical operation, set poll timer | |
1636 | * slack to 25% and kick event check. | |
1637 | */ | |
1638 | intv = disk_events_poll_jiffies(disk); | |
1639 | set_timer_slack(&ev->dwork.timer, intv / 4); | |
1640 | if (check_now) | |
3c2a0909 S |
1641 | queue_delayed_work(system_freezable_power_efficient_wq, |
1642 | &ev->dwork, 0); | |
77ea887e | 1643 | else if (intv) |
3c2a0909 S |
1644 | queue_delayed_work(system_freezable_power_efficient_wq, |
1645 | &ev->dwork, intv); | |
77ea887e TH |
1646 | out_unlock: |
1647 | spin_unlock_irqrestore(&ev->lock, flags); | |
1648 | } | |
1649 | ||
77ea887e TH |
1650 | /** |
1651 | * disk_unblock_events - unblock disk event checking | |
1652 | * @disk: disk to unblock events for | |
1653 | * | |
1654 | * Undo disk_block_events(). When the block count reaches zero, it | |
1655 | * starts events polling if configured. | |
1656 | * | |
1657 | * CONTEXT: | |
1658 | * Don't care. Safe to call from irq context. | |
1659 | */ | |
1660 | void disk_unblock_events(struct gendisk *disk) | |
1661 | { | |
1662 | if (disk->ev) | |
facc31dd | 1663 | __disk_unblock_events(disk, false); |
77ea887e TH |
1664 | } |
1665 | ||
1666 | /** | |
85ef06d1 TH |
1667 | * disk_flush_events - schedule immediate event checking and flushing |
1668 | * @disk: disk to check and flush events for | |
1669 | * @mask: events to flush | |
77ea887e | 1670 | * |
85ef06d1 TH |
1671 | * Schedule immediate event checking on @disk if not blocked. Events in |
1672 | * @mask are scheduled to be cleared from the driver. Note that this | |
1673 | * doesn't clear the events from @disk->ev. | |
77ea887e TH |
1674 | * |
1675 | * CONTEXT: | |
85ef06d1 | 1676 | * If @mask is non-zero must be called with bdev->bd_mutex held. |
77ea887e | 1677 | */ |
85ef06d1 | 1678 | void disk_flush_events(struct gendisk *disk, unsigned int mask) |
77ea887e | 1679 | { |
a9dce2a3 | 1680 | struct disk_events *ev = disk->ev; |
a9dce2a3 TH |
1681 | |
1682 | if (!ev) | |
1683 | return; | |
1684 | ||
85ef06d1 TH |
1685 | spin_lock_irq(&ev->lock); |
1686 | ev->clearing |= mask; | |
41f63c53 | 1687 | if (!ev->block) |
3c2a0909 S |
1688 | mod_delayed_work(system_freezable_power_efficient_wq, |
1689 | &ev->dwork, 0); | |
85ef06d1 | 1690 | spin_unlock_irq(&ev->lock); |
77ea887e | 1691 | } |
77ea887e TH |
1692 | |
1693 | /** | |
1694 | * disk_clear_events - synchronously check, clear and return pending events | |
1695 | * @disk: disk to fetch and clear events from | |
1696 | * @mask: mask of events to be fetched and clearted | |
1697 | * | |
1698 | * Disk events are synchronously checked and pending events in @mask | |
1699 | * are cleared and returned. This ignores the block count. | |
1700 | * | |
1701 | * CONTEXT: | |
1702 | * Might sleep. | |
1703 | */ | |
1704 | unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask) | |
1705 | { | |
1706 | const struct block_device_operations *bdops = disk->fops; | |
1707 | struct disk_events *ev = disk->ev; | |
1708 | unsigned int pending; | |
12c2bdb2 | 1709 | unsigned int clearing = mask; |
77ea887e TH |
1710 | |
1711 | if (!ev) { | |
1712 | /* for drivers still using the old ->media_changed method */ | |
1713 | if ((mask & DISK_EVENT_MEDIA_CHANGE) && | |
1714 | bdops->media_changed && bdops->media_changed(disk)) | |
1715 | return DISK_EVENT_MEDIA_CHANGE; | |
1716 | return 0; | |
1717 | } | |
1718 | ||
12c2bdb2 DB |
1719 | disk_block_events(disk); |
1720 | ||
1721 | /* | |
1722 | * store the union of mask and ev->clearing on the stack so that the | |
1723 | * race with disk_flush_events does not cause ambiguity (ev->clearing | |
1724 | * can still be modified even if events are blocked). | |
1725 | */ | |
77ea887e | 1726 | spin_lock_irq(&ev->lock); |
12c2bdb2 DB |
1727 | clearing |= ev->clearing; |
1728 | ev->clearing = 0; | |
77ea887e TH |
1729 | spin_unlock_irq(&ev->lock); |
1730 | ||
12c2bdb2 | 1731 | disk_check_events(ev, &clearing); |
aea24a8b | 1732 | /* |
12c2bdb2 DB |
1733 | * if ev->clearing is not 0, the disk_flush_events got called in the |
1734 | * middle of this function, so we want to run the workfn without delay. | |
aea24a8b | 1735 | */ |
12c2bdb2 | 1736 | __disk_unblock_events(disk, ev->clearing ? true : false); |
77ea887e TH |
1737 | |
1738 | /* then, fetch and clear pending events */ | |
1739 | spin_lock_irq(&ev->lock); | |
77ea887e TH |
1740 | pending = ev->pending & mask; |
1741 | ev->pending &= ~mask; | |
1742 | spin_unlock_irq(&ev->lock); | |
12c2bdb2 | 1743 | WARN_ON_ONCE(clearing & mask); |
77ea887e TH |
1744 | |
1745 | return pending; | |
1746 | } | |
1747 | ||
12c2bdb2 DB |
1748 | /* |
1749 | * Separate this part out so that a different pointer for clearing_ptr can be | |
1750 | * passed in for disk_clear_events. | |
1751 | */ | |
77ea887e TH |
1752 | static void disk_events_workfn(struct work_struct *work) |
1753 | { | |
1754 | struct delayed_work *dwork = to_delayed_work(work); | |
1755 | struct disk_events *ev = container_of(dwork, struct disk_events, dwork); | |
12c2bdb2 DB |
1756 | |
1757 | disk_check_events(ev, &ev->clearing); | |
1758 | } | |
1759 | ||
1760 | static void disk_check_events(struct disk_events *ev, | |
1761 | unsigned int *clearing_ptr) | |
1762 | { | |
77ea887e TH |
1763 | struct gendisk *disk = ev->disk; |
1764 | char *envp[ARRAY_SIZE(disk_uevents) + 1] = { }; | |
12c2bdb2 | 1765 | unsigned int clearing = *clearing_ptr; |
77ea887e TH |
1766 | unsigned int events; |
1767 | unsigned long intv; | |
1768 | int nr_events = 0, i; | |
1769 | ||
3c2a0909 S |
1770 | #ifdef CONFIG_USB_STORAGE_DETECT |
1771 | if (!(disk->flags & GENHD_FL_IF_USB)) | |
1772 | /* check events */ | |
1773 | events = disk->fops->check_events(disk, clearing); | |
1774 | else | |
1775 | events = 0; | |
1776 | #else | |
77ea887e | 1777 | events = disk->fops->check_events(disk, clearing); |
3c2a0909 | 1778 | #endif |
77ea887e TH |
1779 | |
1780 | /* accumulate pending events and schedule next poll if necessary */ | |
1781 | spin_lock_irq(&ev->lock); | |
1782 | ||
1783 | events &= ~ev->pending; | |
1784 | ev->pending |= events; | |
12c2bdb2 | 1785 | *clearing_ptr &= ~clearing; |
77ea887e TH |
1786 | |
1787 | intv = disk_events_poll_jiffies(disk); | |
1788 | if (!ev->block && intv) | |
3c2a0909 S |
1789 | queue_delayed_work(system_freezable_power_efficient_wq, |
1790 | &ev->dwork, intv); | |
77ea887e TH |
1791 | |
1792 | spin_unlock_irq(&ev->lock); | |
1793 | ||
7c88a168 TH |
1794 | /* |
1795 | * Tell userland about new events. Only the events listed in | |
1796 | * @disk->events are reported. Unlisted events are processed the | |
1797 | * same internally but never get reported to userland. | |
1798 | */ | |
77ea887e | 1799 | for (i = 0; i < ARRAY_SIZE(disk_uevents); i++) |
7c88a168 | 1800 | if (events & disk->events & (1 << i)) |
77ea887e TH |
1801 | envp[nr_events++] = disk_uevents[i]; |
1802 | ||
3c2a0909 S |
1803 | #ifdef CONFIG_USB_STORAGE_DETECT |
1804 | if (!(disk->flags & GENHD_FL_IF_USB)) { | |
1805 | if (nr_events) | |
1806 | kobject_uevent_env(&disk_to_dev(disk)->kobj, | |
1807 | KOBJ_CHANGE, envp); | |
1808 | } | |
1809 | #else | |
77ea887e | 1810 | if (nr_events) |
3c2a0909 S |
1811 | kobject_uevent_env(&disk_to_dev(disk)->kobj, |
1812 | KOBJ_CHANGE, envp); | |
1813 | #endif | |
77ea887e TH |
1814 | } |
1815 | ||
1816 | /* | |
1817 | * A disk events enabled device has the following sysfs nodes under | |
1818 | * its /sys/block/X/ directory. | |
1819 | * | |
1820 | * events : list of all supported events | |
1821 | * events_async : list of events which can be detected w/o polling | |
1822 | * events_poll_msecs : polling interval, 0: disable, -1: system default | |
1823 | */ | |
1824 | static ssize_t __disk_events_show(unsigned int events, char *buf) | |
1825 | { | |
1826 | const char *delim = ""; | |
1827 | ssize_t pos = 0; | |
1828 | int i; | |
1829 | ||
1830 | for (i = 0; i < ARRAY_SIZE(disk_events_strs); i++) | |
1831 | if (events & (1 << i)) { | |
1832 | pos += sprintf(buf + pos, "%s%s", | |
1833 | delim, disk_events_strs[i]); | |
1834 | delim = " "; | |
1835 | } | |
1836 | if (pos) | |
1837 | pos += sprintf(buf + pos, "\n"); | |
1838 | return pos; | |
1839 | } | |
1840 | ||
1841 | static ssize_t disk_events_show(struct device *dev, | |
1842 | struct device_attribute *attr, char *buf) | |
1843 | { | |
1844 | struct gendisk *disk = dev_to_disk(dev); | |
1845 | ||
1846 | return __disk_events_show(disk->events, buf); | |
1847 | } | |
1848 | ||
1849 | static ssize_t disk_events_async_show(struct device *dev, | |
1850 | struct device_attribute *attr, char *buf) | |
1851 | { | |
1852 | struct gendisk *disk = dev_to_disk(dev); | |
1853 | ||
1854 | return __disk_events_show(disk->async_events, buf); | |
1855 | } | |
1856 | ||
1857 | static ssize_t disk_events_poll_msecs_show(struct device *dev, | |
1858 | struct device_attribute *attr, | |
1859 | char *buf) | |
1860 | { | |
1861 | struct gendisk *disk = dev_to_disk(dev); | |
1862 | ||
1863 | return sprintf(buf, "%ld\n", disk->ev->poll_msecs); | |
1864 | } | |
1865 | ||
1866 | static ssize_t disk_events_poll_msecs_store(struct device *dev, | |
1867 | struct device_attribute *attr, | |
1868 | const char *buf, size_t count) | |
1869 | { | |
1870 | struct gendisk *disk = dev_to_disk(dev); | |
1871 | long intv; | |
1872 | ||
1873 | if (!count || !sscanf(buf, "%ld", &intv)) | |
1874 | return -EINVAL; | |
1875 | ||
1876 | if (intv < 0 && intv != -1) | |
1877 | return -EINVAL; | |
1878 | ||
c3af54af | 1879 | disk_block_events(disk); |
77ea887e TH |
1880 | disk->ev->poll_msecs = intv; |
1881 | __disk_unblock_events(disk, true); | |
1882 | ||
1883 | return count; | |
1884 | } | |
1885 | ||
1886 | static const DEVICE_ATTR(events, S_IRUGO, disk_events_show, NULL); | |
1887 | static const DEVICE_ATTR(events_async, S_IRUGO, disk_events_async_show, NULL); | |
1888 | static const DEVICE_ATTR(events_poll_msecs, S_IRUGO|S_IWUSR, | |
1889 | disk_events_poll_msecs_show, | |
1890 | disk_events_poll_msecs_store); | |
1891 | ||
1892 | static const struct attribute *disk_events_attrs[] = { | |
1893 | &dev_attr_events.attr, | |
1894 | &dev_attr_events_async.attr, | |
1895 | &dev_attr_events_poll_msecs.attr, | |
1896 | NULL, | |
1897 | }; | |
1898 | ||
1899 | /* | |
1900 | * The default polling interval can be specified by the kernel | |
1901 | * parameter block.events_dfl_poll_msecs which defaults to 0 | |
1902 | * (disable). This can also be modified runtime by writing to | |
1903 | * /sys/module/block/events_dfl_poll_msecs. | |
1904 | */ | |
1905 | static int disk_events_set_dfl_poll_msecs(const char *val, | |
1906 | const struct kernel_param *kp) | |
1907 | { | |
1908 | struct disk_events *ev; | |
1909 | int ret; | |
1910 | ||
1911 | ret = param_set_ulong(val, kp); | |
1912 | if (ret < 0) | |
1913 | return ret; | |
1914 | ||
1915 | mutex_lock(&disk_events_mutex); | |
1916 | ||
1917 | list_for_each_entry(ev, &disk_events, node) | |
85ef06d1 | 1918 | disk_flush_events(ev->disk, 0); |
77ea887e TH |
1919 | |
1920 | mutex_unlock(&disk_events_mutex); | |
1921 | ||
1922 | return 0; | |
1923 | } | |
1924 | ||
1925 | static const struct kernel_param_ops disk_events_dfl_poll_msecs_param_ops = { | |
1926 | .set = disk_events_set_dfl_poll_msecs, | |
1927 | .get = param_get_ulong, | |
1928 | }; | |
1929 | ||
1930 | #undef MODULE_PARAM_PREFIX | |
1931 | #define MODULE_PARAM_PREFIX "block." | |
1932 | ||
1933 | module_param_cb(events_dfl_poll_msecs, &disk_events_dfl_poll_msecs_param_ops, | |
1934 | &disk_events_dfl_poll_msecs, 0644); | |
1935 | ||
1936 | /* | |
9f53d2fe | 1937 | * disk_{alloc|add|del|release}_events - initialize and destroy disk_events. |
77ea887e | 1938 | */ |
9f53d2fe | 1939 | static void disk_alloc_events(struct gendisk *disk) |
77ea887e TH |
1940 | { |
1941 | struct disk_events *ev; | |
1942 | ||
75e3f3ee | 1943 | if (!disk->fops->check_events) |
77ea887e TH |
1944 | return; |
1945 | ||
1946 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
1947 | if (!ev) { | |
1948 | pr_warn("%s: failed to initialize events\n", disk->disk_name); | |
1949 | return; | |
1950 | } | |
1951 | ||
77ea887e TH |
1952 | INIT_LIST_HEAD(&ev->node); |
1953 | ev->disk = disk; | |
1954 | spin_lock_init(&ev->lock); | |
fdd514e1 | 1955 | mutex_init(&ev->block_mutex); |
77ea887e TH |
1956 | ev->block = 1; |
1957 | ev->poll_msecs = -1; | |
1958 | INIT_DELAYED_WORK(&ev->dwork, disk_events_workfn); | |
1959 | ||
9f53d2fe SG |
1960 | disk->ev = ev; |
1961 | } | |
1962 | ||
1963 | static void disk_add_events(struct gendisk *disk) | |
1964 | { | |
1965 | if (!disk->ev) | |
1966 | return; | |
1967 | ||
1968 | /* FIXME: error handling */ | |
1969 | if (sysfs_create_files(&disk_to_dev(disk)->kobj, disk_events_attrs) < 0) | |
1970 | pr_warn("%s: failed to create sysfs files for events\n", | |
1971 | disk->disk_name); | |
1972 | ||
77ea887e | 1973 | mutex_lock(&disk_events_mutex); |
9f53d2fe | 1974 | list_add_tail(&disk->ev->node, &disk_events); |
77ea887e TH |
1975 | mutex_unlock(&disk_events_mutex); |
1976 | ||
1977 | /* | |
1978 | * Block count is initialized to 1 and the following initial | |
1979 | * unblock kicks it into action. | |
1980 | */ | |
1981 | __disk_unblock_events(disk, true); | |
1982 | } | |
1983 | ||
1984 | static void disk_del_events(struct gendisk *disk) | |
1985 | { | |
1986 | if (!disk->ev) | |
1987 | return; | |
1988 | ||
c3af54af | 1989 | disk_block_events(disk); |
77ea887e TH |
1990 | |
1991 | mutex_lock(&disk_events_mutex); | |
1992 | list_del_init(&disk->ev->node); | |
1993 | mutex_unlock(&disk_events_mutex); | |
1994 | ||
1995 | sysfs_remove_files(&disk_to_dev(disk)->kobj, disk_events_attrs); | |
1996 | } | |
1997 | ||
1998 | static void disk_release_events(struct gendisk *disk) | |
1999 | { | |
2000 | /* the block count should be 1 from disk_del_events() */ | |
2001 | WARN_ON_ONCE(disk->ev && disk->ev->block != 1); | |
2002 | kfree(disk->ev); | |
2003 | } |