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3dcf60bc | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * gendisk handling | |
4 | */ | |
5 | ||
1da177e4 LT |
6 | #include <linux/module.h> |
7 | #include <linux/fs.h> | |
8 | #include <linux/genhd.h> | |
b446b60e | 9 | #include <linux/kdev_t.h> |
1da177e4 LT |
10 | #include <linux/kernel.h> |
11 | #include <linux/blkdev.h> | |
66114cad | 12 | #include <linux/backing-dev.h> |
1da177e4 LT |
13 | #include <linux/init.h> |
14 | #include <linux/spinlock.h> | |
f500975a | 15 | #include <linux/proc_fs.h> |
1da177e4 LT |
16 | #include <linux/seq_file.h> |
17 | #include <linux/slab.h> | |
18 | #include <linux/kmod.h> | |
19 | #include <linux/kobj_map.h> | |
58383af6 | 20 | #include <linux/mutex.h> |
bcce3de1 | 21 | #include <linux/idr.h> |
77ea887e | 22 | #include <linux/log2.h> |
25e823c8 | 23 | #include <linux/pm_runtime.h> |
99e6608c | 24 | #include <linux/badblocks.h> |
1da177e4 | 25 | |
ff88972c AB |
26 | #include "blk.h" |
27 | ||
edfaa7c3 | 28 | static DEFINE_MUTEX(block_class_lock); |
edfaa7c3 | 29 | struct kobject *block_depr; |
1da177e4 | 30 | |
bcce3de1 | 31 | /* for extended dynamic devt allocation, currently only one major is used */ |
ce23bba8 | 32 | #define NR_EXT_DEVT (1 << MINORBITS) |
bcce3de1 | 33 | |
2da78092 | 34 | /* For extended devt allocation. ext_devt_lock prevents look up |
bcce3de1 TH |
35 | * results from going away underneath its user. |
36 | */ | |
2da78092 | 37 | static DEFINE_SPINLOCK(ext_devt_lock); |
bcce3de1 TH |
38 | static DEFINE_IDR(ext_devt_idr); |
39 | ||
edf8ff55 | 40 | static const struct device_type disk_type; |
1826eadf | 41 | |
12c2bdb2 DB |
42 | static void disk_check_events(struct disk_events *ev, |
43 | unsigned int *clearing_ptr); | |
9f53d2fe | 44 | static void disk_alloc_events(struct gendisk *disk); |
77ea887e TH |
45 | static void disk_add_events(struct gendisk *disk); |
46 | static void disk_del_events(struct gendisk *disk); | |
47 | static void disk_release_events(struct gendisk *disk); | |
48 | ||
f299b7c7 JA |
49 | void part_inc_in_flight(struct request_queue *q, struct hd_struct *part, int rw) |
50 | { | |
344e9ffc | 51 | if (queue_is_mq(q)) |
f299b7c7 JA |
52 | return; |
53 | ||
1226b8dd | 54 | part_stat_local_inc(part, in_flight[rw]); |
f299b7c7 | 55 | if (part->partno) |
1226b8dd | 56 | part_stat_local_inc(&part_to_disk(part)->part0, in_flight[rw]); |
f299b7c7 JA |
57 | } |
58 | ||
59 | void part_dec_in_flight(struct request_queue *q, struct hd_struct *part, int rw) | |
60 | { | |
344e9ffc | 61 | if (queue_is_mq(q)) |
f299b7c7 JA |
62 | return; |
63 | ||
1226b8dd | 64 | part_stat_local_dec(part, in_flight[rw]); |
f299b7c7 | 65 | if (part->partno) |
1226b8dd | 66 | part_stat_local_dec(&part_to_disk(part)->part0, in_flight[rw]); |
f299b7c7 JA |
67 | } |
68 | ||
e016b782 | 69 | unsigned int part_in_flight(struct request_queue *q, struct hd_struct *part) |
f299b7c7 | 70 | { |
1226b8dd | 71 | int cpu; |
e016b782 | 72 | unsigned int inflight; |
1226b8dd | 73 | |
344e9ffc | 74 | if (queue_is_mq(q)) { |
e016b782 | 75 | return blk_mq_in_flight(q, part); |
f299b7c7 JA |
76 | } |
77 | ||
e016b782 | 78 | inflight = 0; |
1226b8dd | 79 | for_each_possible_cpu(cpu) { |
e016b782 MP |
80 | inflight += part_stat_local_read_cpu(part, in_flight[0], cpu) + |
81 | part_stat_local_read_cpu(part, in_flight[1], cpu); | |
1226b8dd | 82 | } |
e016b782 MP |
83 | if ((int)inflight < 0) |
84 | inflight = 0; | |
1226b8dd | 85 | |
e016b782 | 86 | return inflight; |
f299b7c7 JA |
87 | } |
88 | ||
bf0ddaba OS |
89 | void part_in_flight_rw(struct request_queue *q, struct hd_struct *part, |
90 | unsigned int inflight[2]) | |
91 | { | |
1226b8dd MP |
92 | int cpu; |
93 | ||
344e9ffc | 94 | if (queue_is_mq(q)) { |
bf0ddaba OS |
95 | blk_mq_in_flight_rw(q, part, inflight); |
96 | return; | |
97 | } | |
98 | ||
1226b8dd MP |
99 | inflight[0] = 0; |
100 | inflight[1] = 0; | |
101 | for_each_possible_cpu(cpu) { | |
102 | inflight[0] += part_stat_local_read_cpu(part, in_flight[0], cpu); | |
103 | inflight[1] += part_stat_local_read_cpu(part, in_flight[1], cpu); | |
104 | } | |
105 | if ((int)inflight[0] < 0) | |
106 | inflight[0] = 0; | |
107 | if ((int)inflight[1] < 0) | |
108 | inflight[1] = 0; | |
bf0ddaba OS |
109 | } |
110 | ||
807d4af2 CH |
111 | struct hd_struct *__disk_get_part(struct gendisk *disk, int partno) |
112 | { | |
113 | struct disk_part_tbl *ptbl = rcu_dereference(disk->part_tbl); | |
114 | ||
115 | if (unlikely(partno < 0 || partno >= ptbl->len)) | |
116 | return NULL; | |
117 | return rcu_dereference(ptbl->part[partno]); | |
118 | } | |
119 | ||
e71bf0d0 TH |
120 | /** |
121 | * disk_get_part - get partition | |
122 | * @disk: disk to look partition from | |
123 | * @partno: partition number | |
124 | * | |
125 | * Look for partition @partno from @disk. If found, increment | |
126 | * reference count and return it. | |
127 | * | |
128 | * CONTEXT: | |
129 | * Don't care. | |
130 | * | |
131 | * RETURNS: | |
132 | * Pointer to the found partition on success, NULL if not found. | |
133 | */ | |
134 | struct hd_struct *disk_get_part(struct gendisk *disk, int partno) | |
135 | { | |
807d4af2 | 136 | struct hd_struct *part; |
540eed56 | 137 | |
e71bf0d0 | 138 | rcu_read_lock(); |
807d4af2 CH |
139 | part = __disk_get_part(disk, partno); |
140 | if (part) | |
141 | get_device(part_to_dev(part)); | |
e71bf0d0 TH |
142 | rcu_read_unlock(); |
143 | ||
144 | return part; | |
145 | } | |
146 | EXPORT_SYMBOL_GPL(disk_get_part); | |
147 | ||
148 | /** | |
149 | * disk_part_iter_init - initialize partition iterator | |
150 | * @piter: iterator to initialize | |
151 | * @disk: disk to iterate over | |
152 | * @flags: DISK_PITER_* flags | |
153 | * | |
154 | * Initialize @piter so that it iterates over partitions of @disk. | |
155 | * | |
156 | * CONTEXT: | |
157 | * Don't care. | |
158 | */ | |
159 | void disk_part_iter_init(struct disk_part_iter *piter, struct gendisk *disk, | |
160 | unsigned int flags) | |
161 | { | |
540eed56 TH |
162 | struct disk_part_tbl *ptbl; |
163 | ||
164 | rcu_read_lock(); | |
165 | ptbl = rcu_dereference(disk->part_tbl); | |
166 | ||
e71bf0d0 TH |
167 | piter->disk = disk; |
168 | piter->part = NULL; | |
169 | ||
170 | if (flags & DISK_PITER_REVERSE) | |
540eed56 | 171 | piter->idx = ptbl->len - 1; |
71982a40 | 172 | else if (flags & (DISK_PITER_INCL_PART0 | DISK_PITER_INCL_EMPTY_PART0)) |
e71bf0d0 | 173 | piter->idx = 0; |
b5d0b9df TH |
174 | else |
175 | piter->idx = 1; | |
e71bf0d0 TH |
176 | |
177 | piter->flags = flags; | |
540eed56 TH |
178 | |
179 | rcu_read_unlock(); | |
e71bf0d0 TH |
180 | } |
181 | EXPORT_SYMBOL_GPL(disk_part_iter_init); | |
182 | ||
183 | /** | |
184 | * disk_part_iter_next - proceed iterator to the next partition and return it | |
185 | * @piter: iterator of interest | |
186 | * | |
187 | * Proceed @piter to the next partition and return it. | |
188 | * | |
189 | * CONTEXT: | |
190 | * Don't care. | |
191 | */ | |
192 | struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter) | |
193 | { | |
540eed56 | 194 | struct disk_part_tbl *ptbl; |
e71bf0d0 TH |
195 | int inc, end; |
196 | ||
197 | /* put the last partition */ | |
198 | disk_put_part(piter->part); | |
199 | piter->part = NULL; | |
200 | ||
540eed56 | 201 | /* get part_tbl */ |
e71bf0d0 | 202 | rcu_read_lock(); |
540eed56 | 203 | ptbl = rcu_dereference(piter->disk->part_tbl); |
e71bf0d0 TH |
204 | |
205 | /* determine iteration parameters */ | |
206 | if (piter->flags & DISK_PITER_REVERSE) { | |
207 | inc = -1; | |
71982a40 TH |
208 | if (piter->flags & (DISK_PITER_INCL_PART0 | |
209 | DISK_PITER_INCL_EMPTY_PART0)) | |
b5d0b9df TH |
210 | end = -1; |
211 | else | |
212 | end = 0; | |
e71bf0d0 TH |
213 | } else { |
214 | inc = 1; | |
540eed56 | 215 | end = ptbl->len; |
e71bf0d0 TH |
216 | } |
217 | ||
218 | /* iterate to the next partition */ | |
219 | for (; piter->idx != end; piter->idx += inc) { | |
220 | struct hd_struct *part; | |
221 | ||
540eed56 | 222 | part = rcu_dereference(ptbl->part[piter->idx]); |
e71bf0d0 TH |
223 | if (!part) |
224 | continue; | |
c83f6bf9 | 225 | if (!part_nr_sects_read(part) && |
71982a40 TH |
226 | !(piter->flags & DISK_PITER_INCL_EMPTY) && |
227 | !(piter->flags & DISK_PITER_INCL_EMPTY_PART0 && | |
228 | piter->idx == 0)) | |
e71bf0d0 TH |
229 | continue; |
230 | ||
ed9e1982 | 231 | get_device(part_to_dev(part)); |
e71bf0d0 TH |
232 | piter->part = part; |
233 | piter->idx += inc; | |
234 | break; | |
235 | } | |
236 | ||
237 | rcu_read_unlock(); | |
238 | ||
239 | return piter->part; | |
240 | } | |
241 | EXPORT_SYMBOL_GPL(disk_part_iter_next); | |
242 | ||
243 | /** | |
244 | * disk_part_iter_exit - finish up partition iteration | |
245 | * @piter: iter of interest | |
246 | * | |
247 | * Called when iteration is over. Cleans up @piter. | |
248 | * | |
249 | * CONTEXT: | |
250 | * Don't care. | |
251 | */ | |
252 | void disk_part_iter_exit(struct disk_part_iter *piter) | |
253 | { | |
254 | disk_put_part(piter->part); | |
255 | piter->part = NULL; | |
256 | } | |
257 | EXPORT_SYMBOL_GPL(disk_part_iter_exit); | |
258 | ||
a6f23657 JA |
259 | static inline int sector_in_part(struct hd_struct *part, sector_t sector) |
260 | { | |
261 | return part->start_sect <= sector && | |
c83f6bf9 | 262 | sector < part->start_sect + part_nr_sects_read(part); |
a6f23657 JA |
263 | } |
264 | ||
e71bf0d0 TH |
265 | /** |
266 | * disk_map_sector_rcu - map sector to partition | |
267 | * @disk: gendisk of interest | |
268 | * @sector: sector to map | |
269 | * | |
270 | * Find out which partition @sector maps to on @disk. This is | |
271 | * primarily used for stats accounting. | |
272 | * | |
273 | * CONTEXT: | |
274 | * RCU read locked. The returned partition pointer is valid only | |
275 | * while preemption is disabled. | |
276 | * | |
277 | * RETURNS: | |
074a7aca | 278 | * Found partition on success, part0 is returned if no partition matches |
e71bf0d0 TH |
279 | */ |
280 | struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) | |
281 | { | |
540eed56 | 282 | struct disk_part_tbl *ptbl; |
a6f23657 | 283 | struct hd_struct *part; |
e71bf0d0 TH |
284 | int i; |
285 | ||
540eed56 TH |
286 | ptbl = rcu_dereference(disk->part_tbl); |
287 | ||
a6f23657 JA |
288 | part = rcu_dereference(ptbl->last_lookup); |
289 | if (part && sector_in_part(part, sector)) | |
290 | return part; | |
291 | ||
540eed56 | 292 | for (i = 1; i < ptbl->len; i++) { |
a6f23657 | 293 | part = rcu_dereference(ptbl->part[i]); |
e71bf0d0 | 294 | |
a6f23657 JA |
295 | if (part && sector_in_part(part, sector)) { |
296 | rcu_assign_pointer(ptbl->last_lookup, part); | |
e71bf0d0 | 297 | return part; |
a6f23657 | 298 | } |
e71bf0d0 | 299 | } |
074a7aca | 300 | return &disk->part0; |
e71bf0d0 TH |
301 | } |
302 | EXPORT_SYMBOL_GPL(disk_map_sector_rcu); | |
303 | ||
1da177e4 LT |
304 | /* |
305 | * Can be deleted altogether. Later. | |
306 | * | |
307 | */ | |
133d55cd | 308 | #define BLKDEV_MAJOR_HASH_SIZE 255 |
1da177e4 LT |
309 | static struct blk_major_name { |
310 | struct blk_major_name *next; | |
311 | int major; | |
312 | char name[16]; | |
68eef3b4 | 313 | } *major_names[BLKDEV_MAJOR_HASH_SIZE]; |
1da177e4 LT |
314 | |
315 | /* index in the above - for now: assume no multimajor ranges */ | |
e61eb2e9 | 316 | static inline int major_to_index(unsigned major) |
1da177e4 | 317 | { |
68eef3b4 | 318 | return major % BLKDEV_MAJOR_HASH_SIZE; |
7170be5f NH |
319 | } |
320 | ||
68eef3b4 | 321 | #ifdef CONFIG_PROC_FS |
cf771cb5 | 322 | void blkdev_show(struct seq_file *seqf, off_t offset) |
7170be5f | 323 | { |
68eef3b4 | 324 | struct blk_major_name *dp; |
7170be5f | 325 | |
133d55cd LG |
326 | mutex_lock(&block_class_lock); |
327 | for (dp = major_names[major_to_index(offset)]; dp; dp = dp->next) | |
328 | if (dp->major == offset) | |
cf771cb5 | 329 | seq_printf(seqf, "%3d %s\n", dp->major, dp->name); |
133d55cd | 330 | mutex_unlock(&block_class_lock); |
1da177e4 | 331 | } |
68eef3b4 | 332 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 333 | |
9e8c0bcc MN |
334 | /** |
335 | * register_blkdev - register a new block device | |
336 | * | |
f33ff110 SB |
337 | * @major: the requested major device number [1..BLKDEV_MAJOR_MAX-1]. If |
338 | * @major = 0, try to allocate any unused major number. | |
9e8c0bcc MN |
339 | * @name: the name of the new block device as a zero terminated string |
340 | * | |
341 | * The @name must be unique within the system. | |
342 | * | |
0e056eb5 MCC |
343 | * The return value depends on the @major input parameter: |
344 | * | |
f33ff110 SB |
345 | * - if a major device number was requested in range [1..BLKDEV_MAJOR_MAX-1] |
346 | * then the function returns zero on success, or a negative error code | |
0e056eb5 | 347 | * - if any unused major number was requested with @major = 0 parameter |
9e8c0bcc | 348 | * then the return value is the allocated major number in range |
f33ff110 SB |
349 | * [1..BLKDEV_MAJOR_MAX-1] or a negative error code otherwise |
350 | * | |
351 | * See Documentation/admin-guide/devices.txt for the list of allocated | |
352 | * major numbers. | |
9e8c0bcc | 353 | */ |
1da177e4 LT |
354 | int register_blkdev(unsigned int major, const char *name) |
355 | { | |
356 | struct blk_major_name **n, *p; | |
357 | int index, ret = 0; | |
358 | ||
edfaa7c3 | 359 | mutex_lock(&block_class_lock); |
1da177e4 LT |
360 | |
361 | /* temporary */ | |
362 | if (major == 0) { | |
363 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { | |
364 | if (major_names[index] == NULL) | |
365 | break; | |
366 | } | |
367 | ||
368 | if (index == 0) { | |
dfc76d11 KP |
369 | printk("%s: failed to get major for %s\n", |
370 | __func__, name); | |
1da177e4 LT |
371 | ret = -EBUSY; |
372 | goto out; | |
373 | } | |
374 | major = index; | |
375 | ret = major; | |
376 | } | |
377 | ||
133d55cd | 378 | if (major >= BLKDEV_MAJOR_MAX) { |
dfc76d11 KP |
379 | pr_err("%s: major requested (%u) is greater than the maximum (%u) for %s\n", |
380 | __func__, major, BLKDEV_MAJOR_MAX-1, name); | |
133d55cd LG |
381 | |
382 | ret = -EINVAL; | |
383 | goto out; | |
384 | } | |
385 | ||
1da177e4 LT |
386 | p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); |
387 | if (p == NULL) { | |
388 | ret = -ENOMEM; | |
389 | goto out; | |
390 | } | |
391 | ||
392 | p->major = major; | |
393 | strlcpy(p->name, name, sizeof(p->name)); | |
394 | p->next = NULL; | |
395 | index = major_to_index(major); | |
396 | ||
397 | for (n = &major_names[index]; *n; n = &(*n)->next) { | |
398 | if ((*n)->major == major) | |
399 | break; | |
400 | } | |
401 | if (!*n) | |
402 | *n = p; | |
403 | else | |
404 | ret = -EBUSY; | |
405 | ||
406 | if (ret < 0) { | |
f33ff110 | 407 | printk("register_blkdev: cannot get major %u for %s\n", |
1da177e4 LT |
408 | major, name); |
409 | kfree(p); | |
410 | } | |
411 | out: | |
edfaa7c3 | 412 | mutex_unlock(&block_class_lock); |
1da177e4 LT |
413 | return ret; |
414 | } | |
415 | ||
416 | EXPORT_SYMBOL(register_blkdev); | |
417 | ||
f4480240 | 418 | void unregister_blkdev(unsigned int major, const char *name) |
1da177e4 LT |
419 | { |
420 | struct blk_major_name **n; | |
421 | struct blk_major_name *p = NULL; | |
422 | int index = major_to_index(major); | |
1da177e4 | 423 | |
edfaa7c3 | 424 | mutex_lock(&block_class_lock); |
1da177e4 LT |
425 | for (n = &major_names[index]; *n; n = &(*n)->next) |
426 | if ((*n)->major == major) | |
427 | break; | |
294462a5 AM |
428 | if (!*n || strcmp((*n)->name, name)) { |
429 | WARN_ON(1); | |
294462a5 | 430 | } else { |
1da177e4 LT |
431 | p = *n; |
432 | *n = p->next; | |
433 | } | |
edfaa7c3 | 434 | mutex_unlock(&block_class_lock); |
1da177e4 | 435 | kfree(p); |
1da177e4 LT |
436 | } |
437 | ||
438 | EXPORT_SYMBOL(unregister_blkdev); | |
439 | ||
440 | static struct kobj_map *bdev_map; | |
441 | ||
870d6656 TH |
442 | /** |
443 | * blk_mangle_minor - scatter minor numbers apart | |
444 | * @minor: minor number to mangle | |
445 | * | |
446 | * Scatter consecutively allocated @minor number apart if MANGLE_DEVT | |
447 | * is enabled. Mangling twice gives the original value. | |
448 | * | |
449 | * RETURNS: | |
450 | * Mangled value. | |
451 | * | |
452 | * CONTEXT: | |
453 | * Don't care. | |
454 | */ | |
455 | static int blk_mangle_minor(int minor) | |
456 | { | |
457 | #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT | |
458 | int i; | |
459 | ||
460 | for (i = 0; i < MINORBITS / 2; i++) { | |
461 | int low = minor & (1 << i); | |
462 | int high = minor & (1 << (MINORBITS - 1 - i)); | |
463 | int distance = MINORBITS - 1 - 2 * i; | |
464 | ||
465 | minor ^= low | high; /* clear both bits */ | |
466 | low <<= distance; /* swap the positions */ | |
467 | high >>= distance; | |
468 | minor |= low | high; /* and set */ | |
469 | } | |
470 | #endif | |
471 | return minor; | |
472 | } | |
473 | ||
bcce3de1 TH |
474 | /** |
475 | * blk_alloc_devt - allocate a dev_t for a partition | |
476 | * @part: partition to allocate dev_t for | |
bcce3de1 TH |
477 | * @devt: out parameter for resulting dev_t |
478 | * | |
479 | * Allocate a dev_t for block device. | |
480 | * | |
481 | * RETURNS: | |
482 | * 0 on success, allocated dev_t is returned in *@devt. -errno on | |
483 | * failure. | |
484 | * | |
485 | * CONTEXT: | |
486 | * Might sleep. | |
487 | */ | |
488 | int blk_alloc_devt(struct hd_struct *part, dev_t *devt) | |
489 | { | |
490 | struct gendisk *disk = part_to_disk(part); | |
bab998d6 | 491 | int idx; |
bcce3de1 TH |
492 | |
493 | /* in consecutive minor range? */ | |
494 | if (part->partno < disk->minors) { | |
495 | *devt = MKDEV(disk->major, disk->first_minor + part->partno); | |
496 | return 0; | |
497 | } | |
498 | ||
499 | /* allocate ext devt */ | |
2da78092 KB |
500 | idr_preload(GFP_KERNEL); |
501 | ||
4d66e5e9 | 502 | spin_lock_bh(&ext_devt_lock); |
2da78092 | 503 | idx = idr_alloc(&ext_devt_idr, part, 0, NR_EXT_DEVT, GFP_NOWAIT); |
4d66e5e9 | 504 | spin_unlock_bh(&ext_devt_lock); |
2da78092 KB |
505 | |
506 | idr_preload_end(); | |
bab998d6 TH |
507 | if (idx < 0) |
508 | return idx == -ENOSPC ? -EBUSY : idx; | |
bcce3de1 | 509 | |
870d6656 | 510 | *devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx)); |
bcce3de1 TH |
511 | return 0; |
512 | } | |
513 | ||
514 | /** | |
515 | * blk_free_devt - free a dev_t | |
516 | * @devt: dev_t to free | |
517 | * | |
518 | * Free @devt which was allocated using blk_alloc_devt(). | |
519 | * | |
520 | * CONTEXT: | |
521 | * Might sleep. | |
522 | */ | |
523 | void blk_free_devt(dev_t devt) | |
524 | { | |
bcce3de1 TH |
525 | if (devt == MKDEV(0, 0)) |
526 | return; | |
527 | ||
528 | if (MAJOR(devt) == BLOCK_EXT_MAJOR) { | |
4d66e5e9 | 529 | spin_lock_bh(&ext_devt_lock); |
870d6656 | 530 | idr_remove(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
4d66e5e9 | 531 | spin_unlock_bh(&ext_devt_lock); |
bcce3de1 TH |
532 | } |
533 | } | |
534 | ||
33c826ef BVA |
535 | /* |
536 | * We invalidate devt by assigning NULL pointer for devt in idr. | |
6fcc44d1 YY |
537 | */ |
538 | void blk_invalidate_devt(dev_t devt) | |
539 | { | |
540 | if (MAJOR(devt) == BLOCK_EXT_MAJOR) { | |
541 | spin_lock_bh(&ext_devt_lock); | |
542 | idr_replace(&ext_devt_idr, NULL, blk_mangle_minor(MINOR(devt))); | |
543 | spin_unlock_bh(&ext_devt_lock); | |
544 | } | |
545 | } | |
546 | ||
1f014290 TH |
547 | static char *bdevt_str(dev_t devt, char *buf) |
548 | { | |
549 | if (MAJOR(devt) <= 0xff && MINOR(devt) <= 0xff) { | |
550 | char tbuf[BDEVT_SIZE]; | |
551 | snprintf(tbuf, BDEVT_SIZE, "%02x%02x", MAJOR(devt), MINOR(devt)); | |
552 | snprintf(buf, BDEVT_SIZE, "%-9s", tbuf); | |
553 | } else | |
554 | snprintf(buf, BDEVT_SIZE, "%03x:%05x", MAJOR(devt), MINOR(devt)); | |
555 | ||
556 | return buf; | |
557 | } | |
558 | ||
1da177e4 LT |
559 | /* |
560 | * Register device numbers dev..(dev+range-1) | |
561 | * range must be nonzero | |
562 | * The hash chain is sorted on range, so that subranges can override. | |
563 | */ | |
edfaa7c3 | 564 | void blk_register_region(dev_t devt, unsigned long range, struct module *module, |
1da177e4 LT |
565 | struct kobject *(*probe)(dev_t, int *, void *), |
566 | int (*lock)(dev_t, void *), void *data) | |
567 | { | |
edfaa7c3 | 568 | kobj_map(bdev_map, devt, range, module, probe, lock, data); |
1da177e4 LT |
569 | } |
570 | ||
571 | EXPORT_SYMBOL(blk_register_region); | |
572 | ||
edfaa7c3 | 573 | void blk_unregister_region(dev_t devt, unsigned long range) |
1da177e4 | 574 | { |
edfaa7c3 | 575 | kobj_unmap(bdev_map, devt, range); |
1da177e4 LT |
576 | } |
577 | ||
578 | EXPORT_SYMBOL(blk_unregister_region); | |
579 | ||
cf771cb5 | 580 | static struct kobject *exact_match(dev_t devt, int *partno, void *data) |
1da177e4 LT |
581 | { |
582 | struct gendisk *p = data; | |
edfaa7c3 | 583 | |
ed9e1982 | 584 | return &disk_to_dev(p)->kobj; |
1da177e4 LT |
585 | } |
586 | ||
edfaa7c3 | 587 | static int exact_lock(dev_t devt, void *data) |
1da177e4 LT |
588 | { |
589 | struct gendisk *p = data; | |
590 | ||
3079c22e | 591 | if (!get_disk_and_module(p)) |
1da177e4 LT |
592 | return -1; |
593 | return 0; | |
594 | } | |
595 | ||
fef912bf HR |
596 | static void register_disk(struct device *parent, struct gendisk *disk, |
597 | const struct attribute_group **groups) | |
d2bf1b67 TH |
598 | { |
599 | struct device *ddev = disk_to_dev(disk); | |
600 | struct block_device *bdev; | |
601 | struct disk_part_iter piter; | |
602 | struct hd_struct *part; | |
603 | int err; | |
604 | ||
e63a46be | 605 | ddev->parent = parent; |
d2bf1b67 | 606 | |
ffc8b308 | 607 | dev_set_name(ddev, "%s", disk->disk_name); |
d2bf1b67 TH |
608 | |
609 | /* delay uevents, until we scanned partition table */ | |
610 | dev_set_uevent_suppress(ddev, 1); | |
611 | ||
fef912bf HR |
612 | if (groups) { |
613 | WARN_ON(ddev->groups); | |
614 | ddev->groups = groups; | |
615 | } | |
d2bf1b67 TH |
616 | if (device_add(ddev)) |
617 | return; | |
618 | if (!sysfs_deprecated) { | |
619 | err = sysfs_create_link(block_depr, &ddev->kobj, | |
620 | kobject_name(&ddev->kobj)); | |
621 | if (err) { | |
622 | device_del(ddev); | |
623 | return; | |
624 | } | |
625 | } | |
25e823c8 ML |
626 | |
627 | /* | |
628 | * avoid probable deadlock caused by allocating memory with | |
629 | * GFP_KERNEL in runtime_resume callback of its all ancestor | |
630 | * devices | |
631 | */ | |
632 | pm_runtime_set_memalloc_noio(ddev, true); | |
633 | ||
d2bf1b67 TH |
634 | disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj); |
635 | disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj); | |
636 | ||
8ddcd653 CH |
637 | if (disk->flags & GENHD_FL_HIDDEN) { |
638 | dev_set_uevent_suppress(ddev, 0); | |
639 | return; | |
640 | } | |
641 | ||
d2bf1b67 | 642 | /* No minors to use for partitions */ |
d27769ec | 643 | if (!disk_part_scan_enabled(disk)) |
d2bf1b67 TH |
644 | goto exit; |
645 | ||
646 | /* No such device (e.g., media were just removed) */ | |
647 | if (!get_capacity(disk)) | |
648 | goto exit; | |
649 | ||
650 | bdev = bdget_disk(disk, 0); | |
651 | if (!bdev) | |
652 | goto exit; | |
653 | ||
654 | bdev->bd_invalidated = 1; | |
655 | err = blkdev_get(bdev, FMODE_READ, NULL); | |
656 | if (err < 0) | |
657 | goto exit; | |
658 | blkdev_put(bdev, FMODE_READ); | |
659 | ||
660 | exit: | |
661 | /* announce disk after possible partitions are created */ | |
662 | dev_set_uevent_suppress(ddev, 0); | |
663 | kobject_uevent(&ddev->kobj, KOBJ_ADD); | |
664 | ||
665 | /* announce possible partitions */ | |
666 | disk_part_iter_init(&piter, disk, 0); | |
667 | while ((part = disk_part_iter_next(&piter))) | |
668 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD); | |
669 | disk_part_iter_exit(&piter); | |
8ddcd653 | 670 | |
4d7c1d3f | 671 | if (disk->queue->backing_dev_info->dev) { |
672 | err = sysfs_create_link(&ddev->kobj, | |
673 | &disk->queue->backing_dev_info->dev->kobj, | |
674 | "bdi"); | |
675 | WARN_ON(err); | |
676 | } | |
d2bf1b67 TH |
677 | } |
678 | ||
1da177e4 | 679 | /** |
fa70d2e2 | 680 | * __device_add_disk - add disk information to kernel list |
e63a46be | 681 | * @parent: parent device for the disk |
1da177e4 | 682 | * @disk: per-device partitioning information |
fef912bf | 683 | * @groups: Additional per-device sysfs groups |
fa70d2e2 | 684 | * @register_queue: register the queue if set to true |
1da177e4 LT |
685 | * |
686 | * This function registers the partitioning information in @disk | |
687 | * with the kernel. | |
3e1a7ff8 TH |
688 | * |
689 | * FIXME: error handling | |
1da177e4 | 690 | */ |
fa70d2e2 | 691 | static void __device_add_disk(struct device *parent, struct gendisk *disk, |
fef912bf | 692 | const struct attribute_group **groups, |
fa70d2e2 | 693 | bool register_queue) |
1da177e4 | 694 | { |
3e1a7ff8 | 695 | dev_t devt; |
6ffeea77 | 696 | int retval; |
cf0ca9fe | 697 | |
737eb78e DLM |
698 | /* |
699 | * The disk queue should now be all set with enough information about | |
700 | * the device for the elevator code to pick an adequate default | |
701 | * elevator if one is needed, that is, for devices requesting queue | |
702 | * registration. | |
703 | */ | |
704 | if (register_queue) | |
705 | elevator_init_mq(disk->queue); | |
706 | ||
3e1a7ff8 TH |
707 | /* minors == 0 indicates to use ext devt from part0 and should |
708 | * be accompanied with EXT_DEVT flag. Make sure all | |
709 | * parameters make sense. | |
710 | */ | |
711 | WARN_ON(disk->minors && !(disk->major || disk->first_minor)); | |
8ddcd653 CH |
712 | WARN_ON(!disk->minors && |
713 | !(disk->flags & (GENHD_FL_EXT_DEVT | GENHD_FL_HIDDEN))); | |
3e1a7ff8 | 714 | |
1da177e4 | 715 | disk->flags |= GENHD_FL_UP; |
3e1a7ff8 TH |
716 | |
717 | retval = blk_alloc_devt(&disk->part0, &devt); | |
718 | if (retval) { | |
719 | WARN_ON(1); | |
720 | return; | |
721 | } | |
3e1a7ff8 TH |
722 | disk->major = MAJOR(devt); |
723 | disk->first_minor = MINOR(devt); | |
724 | ||
9f53d2fe SG |
725 | disk_alloc_events(disk); |
726 | ||
8ddcd653 CH |
727 | if (disk->flags & GENHD_FL_HIDDEN) { |
728 | /* | |
729 | * Don't let hidden disks show up in /proc/partitions, | |
730 | * and don't bother scanning for partitions either. | |
731 | */ | |
732 | disk->flags |= GENHD_FL_SUPPRESS_PARTITION_INFO; | |
733 | disk->flags |= GENHD_FL_NO_PART_SCAN; | |
734 | } else { | |
3a92168b | 735 | int ret; |
736 | ||
8ddcd653 CH |
737 | /* Register BDI before referencing it from bdev */ |
738 | disk_to_dev(disk)->devt = devt; | |
3a92168b | 739 | ret = bdi_register_owner(disk->queue->backing_dev_info, |
740 | disk_to_dev(disk)); | |
741 | WARN_ON(ret); | |
8ddcd653 CH |
742 | blk_register_region(disk_devt(disk), disk->minors, NULL, |
743 | exact_match, exact_lock, disk); | |
744 | } | |
fef912bf | 745 | register_disk(parent, disk, groups); |
fa70d2e2 MS |
746 | if (register_queue) |
747 | blk_register_queue(disk); | |
cf0ca9fe | 748 | |
523e1d39 TH |
749 | /* |
750 | * Take an extra ref on queue which will be put on disk_release() | |
751 | * so that it sticks around as long as @disk is there. | |
752 | */ | |
09ac46c4 | 753 | WARN_ON_ONCE(!blk_get_queue(disk->queue)); |
523e1d39 | 754 | |
77ea887e | 755 | disk_add_events(disk); |
25520d55 | 756 | blk_integrity_add(disk); |
1da177e4 | 757 | } |
fa70d2e2 | 758 | |
fef912bf HR |
759 | void device_add_disk(struct device *parent, struct gendisk *disk, |
760 | const struct attribute_group **groups) | |
761 | ||
fa70d2e2 | 762 | { |
fef912bf | 763 | __device_add_disk(parent, disk, groups, true); |
fa70d2e2 | 764 | } |
e63a46be | 765 | EXPORT_SYMBOL(device_add_disk); |
1da177e4 | 766 | |
fa70d2e2 MS |
767 | void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk) |
768 | { | |
fef912bf | 769 | __device_add_disk(parent, disk, NULL, false); |
fa70d2e2 MS |
770 | } |
771 | EXPORT_SYMBOL(device_add_disk_no_queue_reg); | |
772 | ||
d2bf1b67 | 773 | void del_gendisk(struct gendisk *disk) |
1da177e4 | 774 | { |
d2bf1b67 TH |
775 | struct disk_part_iter piter; |
776 | struct hd_struct *part; | |
777 | ||
25520d55 | 778 | blk_integrity_del(disk); |
77ea887e TH |
779 | disk_del_events(disk); |
780 | ||
56c0908c JK |
781 | /* |
782 | * Block lookups of the disk until all bdevs are unhashed and the | |
783 | * disk is marked as dead (GENHD_FL_UP cleared). | |
784 | */ | |
785 | down_write(&disk->lookup_sem); | |
d2bf1b67 TH |
786 | /* invalidate stuff */ |
787 | disk_part_iter_init(&piter, disk, | |
788 | DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE); | |
789 | while ((part = disk_part_iter_next(&piter))) { | |
790 | invalidate_partition(disk, part->partno); | |
4b8c861a | 791 | bdev_unhash_inode(part_devt(part)); |
d2bf1b67 TH |
792 | delete_partition(disk, part->partno); |
793 | } | |
794 | disk_part_iter_exit(&piter); | |
795 | ||
796 | invalidate_partition(disk, 0); | |
d06e05c0 | 797 | bdev_unhash_inode(disk_devt(disk)); |
d2bf1b67 TH |
798 | set_capacity(disk, 0); |
799 | disk->flags &= ~GENHD_FL_UP; | |
56c0908c | 800 | up_write(&disk->lookup_sem); |
d2bf1b67 | 801 | |
8ddcd653 CH |
802 | if (!(disk->flags & GENHD_FL_HIDDEN)) |
803 | sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); | |
90f16fdd JK |
804 | if (disk->queue) { |
805 | /* | |
806 | * Unregister bdi before releasing device numbers (as they can | |
807 | * get reused and we'd get clashes in sysfs). | |
808 | */ | |
bc8d062c MS |
809 | if (!(disk->flags & GENHD_FL_HIDDEN)) |
810 | bdi_unregister(disk->queue->backing_dev_info); | |
90f16fdd JK |
811 | blk_unregister_queue(disk); |
812 | } else { | |
813 | WARN_ON(1); | |
814 | } | |
d2bf1b67 | 815 | |
17eac099 | 816 | if (!(disk->flags & GENHD_FL_HIDDEN)) |
8ddcd653 | 817 | blk_unregister_region(disk_devt(disk), disk->minors); |
6fcc44d1 YY |
818 | /* |
819 | * Remove gendisk pointer from idr so that it cannot be looked up | |
820 | * while RCU period before freeing gendisk is running to prevent | |
821 | * use-after-free issues. Note that the device number stays | |
822 | * "in-use" until we really free the gendisk. | |
823 | */ | |
824 | blk_invalidate_devt(disk_devt(disk)); | |
d2bf1b67 TH |
825 | |
826 | kobject_put(disk->part0.holder_dir); | |
827 | kobject_put(disk->slave_dir); | |
d2bf1b67 TH |
828 | |
829 | part_stat_set_all(&disk->part0, 0); | |
830 | disk->part0.stamp = 0; | |
d2bf1b67 TH |
831 | if (!sysfs_deprecated) |
832 | sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); | |
25e823c8 | 833 | pm_runtime_set_memalloc_noio(disk_to_dev(disk), false); |
d2bf1b67 | 834 | device_del(disk_to_dev(disk)); |
1da177e4 | 835 | } |
d2bf1b67 | 836 | EXPORT_SYMBOL(del_gendisk); |
1da177e4 | 837 | |
99e6608c VV |
838 | /* sysfs access to bad-blocks list. */ |
839 | static ssize_t disk_badblocks_show(struct device *dev, | |
840 | struct device_attribute *attr, | |
841 | char *page) | |
842 | { | |
843 | struct gendisk *disk = dev_to_disk(dev); | |
844 | ||
845 | if (!disk->bb) | |
846 | return sprintf(page, "\n"); | |
847 | ||
848 | return badblocks_show(disk->bb, page, 0); | |
849 | } | |
850 | ||
851 | static ssize_t disk_badblocks_store(struct device *dev, | |
852 | struct device_attribute *attr, | |
853 | const char *page, size_t len) | |
854 | { | |
855 | struct gendisk *disk = dev_to_disk(dev); | |
856 | ||
857 | if (!disk->bb) | |
858 | return -ENXIO; | |
859 | ||
860 | return badblocks_store(disk->bb, page, len, 0); | |
861 | } | |
862 | ||
1da177e4 LT |
863 | /** |
864 | * get_gendisk - get partitioning information for a given device | |
710027a4 | 865 | * @devt: device to get partitioning information for |
496aa8a9 | 866 | * @partno: returned partition index |
1da177e4 LT |
867 | * |
868 | * This function gets the structure containing partitioning | |
710027a4 | 869 | * information for the given device @devt. |
1da177e4 | 870 | */ |
cf771cb5 | 871 | struct gendisk *get_gendisk(dev_t devt, int *partno) |
1da177e4 | 872 | { |
bcce3de1 TH |
873 | struct gendisk *disk = NULL; |
874 | ||
875 | if (MAJOR(devt) != BLOCK_EXT_MAJOR) { | |
876 | struct kobject *kobj; | |
877 | ||
878 | kobj = kobj_lookup(bdev_map, devt, partno); | |
879 | if (kobj) | |
880 | disk = dev_to_disk(kobj_to_dev(kobj)); | |
881 | } else { | |
882 | struct hd_struct *part; | |
883 | ||
4d66e5e9 | 884 | spin_lock_bh(&ext_devt_lock); |
870d6656 | 885 | part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
3079c22e | 886 | if (part && get_disk_and_module(part_to_disk(part))) { |
bcce3de1 TH |
887 | *partno = part->partno; |
888 | disk = part_to_disk(part); | |
889 | } | |
4d66e5e9 | 890 | spin_unlock_bh(&ext_devt_lock); |
bcce3de1 | 891 | } |
edfaa7c3 | 892 | |
56c0908c JK |
893 | if (!disk) |
894 | return NULL; | |
895 | ||
896 | /* | |
897 | * Synchronize with del_gendisk() to not return disk that is being | |
898 | * destroyed. | |
899 | */ | |
900 | down_read(&disk->lookup_sem); | |
901 | if (unlikely((disk->flags & GENHD_FL_HIDDEN) || | |
902 | !(disk->flags & GENHD_FL_UP))) { | |
903 | up_read(&disk->lookup_sem); | |
9df6c299 | 904 | put_disk_and_module(disk); |
8ddcd653 | 905 | disk = NULL; |
56c0908c JK |
906 | } else { |
907 | up_read(&disk->lookup_sem); | |
8ddcd653 | 908 | } |
bcce3de1 | 909 | return disk; |
1da177e4 | 910 | } |
b6ac23af | 911 | EXPORT_SYMBOL(get_gendisk); |
1da177e4 | 912 | |
f331c029 TH |
913 | /** |
914 | * bdget_disk - do bdget() by gendisk and partition number | |
915 | * @disk: gendisk of interest | |
916 | * @partno: partition number | |
917 | * | |
918 | * Find partition @partno from @disk, do bdget() on it. | |
919 | * | |
920 | * CONTEXT: | |
921 | * Don't care. | |
922 | * | |
923 | * RETURNS: | |
924 | * Resulting block_device on success, NULL on failure. | |
925 | */ | |
aeb3d3a8 | 926 | struct block_device *bdget_disk(struct gendisk *disk, int partno) |
f331c029 | 927 | { |
548b10eb TH |
928 | struct hd_struct *part; |
929 | struct block_device *bdev = NULL; | |
f331c029 | 930 | |
548b10eb | 931 | part = disk_get_part(disk, partno); |
2bbedcb4 | 932 | if (part) |
548b10eb TH |
933 | bdev = bdget(part_devt(part)); |
934 | disk_put_part(part); | |
f331c029 | 935 | |
548b10eb | 936 | return bdev; |
f331c029 TH |
937 | } |
938 | EXPORT_SYMBOL(bdget_disk); | |
939 | ||
5c6f35c5 GKH |
940 | /* |
941 | * print a full list of all partitions - intended for places where the root | |
942 | * filesystem can't be mounted and thus to give the victim some idea of what | |
943 | * went wrong | |
944 | */ | |
945 | void __init printk_all_partitions(void) | |
946 | { | |
def4e38d TH |
947 | struct class_dev_iter iter; |
948 | struct device *dev; | |
949 | ||
950 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); | |
951 | while ((dev = class_dev_iter_next(&iter))) { | |
952 | struct gendisk *disk = dev_to_disk(dev); | |
e71bf0d0 TH |
953 | struct disk_part_iter piter; |
954 | struct hd_struct *part; | |
1f014290 TH |
955 | char name_buf[BDEVNAME_SIZE]; |
956 | char devt_buf[BDEVT_SIZE]; | |
def4e38d TH |
957 | |
958 | /* | |
959 | * Don't show empty devices or things that have been | |
25985edc | 960 | * suppressed |
def4e38d TH |
961 | */ |
962 | if (get_capacity(disk) == 0 || | |
963 | (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) | |
964 | continue; | |
965 | ||
966 | /* | |
967 | * Note, unlike /proc/partitions, I am showing the | |
968 | * numbers in hex - the same format as the root= | |
969 | * option takes. | |
970 | */ | |
074a7aca TH |
971 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); |
972 | while ((part = disk_part_iter_next(&piter))) { | |
973 | bool is_part0 = part == &disk->part0; | |
def4e38d | 974 | |
b5af921e | 975 | printk("%s%s %10llu %s %s", is_part0 ? "" : " ", |
1f014290 | 976 | bdevt_str(part_devt(part), devt_buf), |
c83f6bf9 VG |
977 | (unsigned long long)part_nr_sects_read(part) >> 1 |
978 | , disk_name(disk, part->partno, name_buf), | |
1ad7e899 | 979 | part->info ? part->info->uuid : ""); |
074a7aca | 980 | if (is_part0) { |
52c44d93 | 981 | if (dev->parent && dev->parent->driver) |
074a7aca | 982 | printk(" driver: %s\n", |
52c44d93 | 983 | dev->parent->driver->name); |
074a7aca TH |
984 | else |
985 | printk(" (driver?)\n"); | |
986 | } else | |
987 | printk("\n"); | |
988 | } | |
e71bf0d0 | 989 | disk_part_iter_exit(&piter); |
def4e38d TH |
990 | } |
991 | class_dev_iter_exit(&iter); | |
dd2a345f DG |
992 | } |
993 | ||
1da177e4 LT |
994 | #ifdef CONFIG_PROC_FS |
995 | /* iterator */ | |
def4e38d | 996 | static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
68c4d4a7 | 997 | { |
def4e38d TH |
998 | loff_t skip = *pos; |
999 | struct class_dev_iter *iter; | |
1000 | struct device *dev; | |
68c4d4a7 | 1001 | |
aeb3d3a8 | 1002 | iter = kmalloc(sizeof(*iter), GFP_KERNEL); |
def4e38d TH |
1003 | if (!iter) |
1004 | return ERR_PTR(-ENOMEM); | |
1005 | ||
1006 | seqf->private = iter; | |
1007 | class_dev_iter_init(iter, &block_class, NULL, &disk_type); | |
1008 | do { | |
1009 | dev = class_dev_iter_next(iter); | |
1010 | if (!dev) | |
1011 | return NULL; | |
1012 | } while (skip--); | |
1013 | ||
1014 | return dev_to_disk(dev); | |
68c4d4a7 GKH |
1015 | } |
1016 | ||
def4e38d | 1017 | static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
1da177e4 | 1018 | { |
edfaa7c3 | 1019 | struct device *dev; |
1da177e4 | 1020 | |
def4e38d TH |
1021 | (*pos)++; |
1022 | dev = class_dev_iter_next(seqf->private); | |
2ac3cee5 | 1023 | if (dev) |
68c4d4a7 | 1024 | return dev_to_disk(dev); |
2ac3cee5 | 1025 | |
1da177e4 LT |
1026 | return NULL; |
1027 | } | |
1028 | ||
def4e38d | 1029 | static void disk_seqf_stop(struct seq_file *seqf, void *v) |
27f30251 | 1030 | { |
def4e38d | 1031 | struct class_dev_iter *iter = seqf->private; |
27f30251 | 1032 | |
def4e38d TH |
1033 | /* stop is called even after start failed :-( */ |
1034 | if (iter) { | |
1035 | class_dev_iter_exit(iter); | |
1036 | kfree(iter); | |
77da1605 | 1037 | seqf->private = NULL; |
5c0ef6d0 | 1038 | } |
1da177e4 LT |
1039 | } |
1040 | ||
def4e38d | 1041 | static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
1da177e4 | 1042 | { |
06768067 | 1043 | void *p; |
def4e38d TH |
1044 | |
1045 | p = disk_seqf_start(seqf, pos); | |
b9f985b6 | 1046 | if (!IS_ERR_OR_NULL(p) && !*pos) |
def4e38d TH |
1047 | seq_puts(seqf, "major minor #blocks name\n\n"); |
1048 | return p; | |
1da177e4 LT |
1049 | } |
1050 | ||
cf771cb5 | 1051 | static int show_partition(struct seq_file *seqf, void *v) |
1da177e4 LT |
1052 | { |
1053 | struct gendisk *sgp = v; | |
e71bf0d0 TH |
1054 | struct disk_part_iter piter; |
1055 | struct hd_struct *part; | |
1da177e4 LT |
1056 | char buf[BDEVNAME_SIZE]; |
1057 | ||
1da177e4 | 1058 | /* Don't show non-partitionable removeable devices or empty devices */ |
d27769ec | 1059 | if (!get_capacity(sgp) || (!disk_max_parts(sgp) && |
f331c029 | 1060 | (sgp->flags & GENHD_FL_REMOVABLE))) |
1da177e4 LT |
1061 | return 0; |
1062 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
1063 | return 0; | |
1064 | ||
1065 | /* show the full disk and all non-0 size partitions of it */ | |
074a7aca | 1066 | disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0); |
e71bf0d0 | 1067 | while ((part = disk_part_iter_next(&piter))) |
1f014290 | 1068 | seq_printf(seqf, "%4d %7d %10llu %s\n", |
f331c029 | 1069 | MAJOR(part_devt(part)), MINOR(part_devt(part)), |
c83f6bf9 | 1070 | (unsigned long long)part_nr_sects_read(part) >> 1, |
f331c029 | 1071 | disk_name(sgp, part->partno, buf)); |
e71bf0d0 | 1072 | disk_part_iter_exit(&piter); |
1da177e4 LT |
1073 | |
1074 | return 0; | |
1075 | } | |
1076 | ||
f500975a | 1077 | static const struct seq_operations partitions_op = { |
def4e38d TH |
1078 | .start = show_partition_start, |
1079 | .next = disk_seqf_next, | |
1080 | .stop = disk_seqf_stop, | |
edfaa7c3 | 1081 | .show = show_partition |
1da177e4 LT |
1082 | }; |
1083 | #endif | |
1084 | ||
1085 | ||
cf771cb5 | 1086 | static struct kobject *base_probe(dev_t devt, int *partno, void *data) |
1da177e4 | 1087 | { |
edfaa7c3 | 1088 | if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
1da177e4 | 1089 | /* Make old-style 2.4 aliases work */ |
edfaa7c3 | 1090 | request_module("block-major-%d", MAJOR(devt)); |
1da177e4 LT |
1091 | return NULL; |
1092 | } | |
1093 | ||
1094 | static int __init genhd_device_init(void) | |
1095 | { | |
e105b8bf DW |
1096 | int error; |
1097 | ||
1098 | block_class.dev_kobj = sysfs_dev_block_kobj; | |
1099 | error = class_register(&block_class); | |
ee27a558 RM |
1100 | if (unlikely(error)) |
1101 | return error; | |
edfaa7c3 | 1102 | bdev_map = kobj_map_init(base_probe, &block_class_lock); |
1da177e4 | 1103 | blk_dev_init(); |
edfaa7c3 | 1104 | |
561ec68e ZY |
1105 | register_blkdev(BLOCK_EXT_MAJOR, "blkext"); |
1106 | ||
edfaa7c3 | 1107 | /* create top-level block dir */ |
e52eec13 AK |
1108 | if (!sysfs_deprecated) |
1109 | block_depr = kobject_create_and_add("block", NULL); | |
830d3cfb | 1110 | return 0; |
1da177e4 LT |
1111 | } |
1112 | ||
1113 | subsys_initcall(genhd_device_init); | |
1114 | ||
edfaa7c3 KS |
1115 | static ssize_t disk_range_show(struct device *dev, |
1116 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1117 | { |
edfaa7c3 | 1118 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 1119 | |
edfaa7c3 | 1120 | return sprintf(buf, "%d\n", disk->minors); |
1da177e4 LT |
1121 | } |
1122 | ||
1f014290 TH |
1123 | static ssize_t disk_ext_range_show(struct device *dev, |
1124 | struct device_attribute *attr, char *buf) | |
1125 | { | |
1126 | struct gendisk *disk = dev_to_disk(dev); | |
1127 | ||
b5d0b9df | 1128 | return sprintf(buf, "%d\n", disk_max_parts(disk)); |
1f014290 TH |
1129 | } |
1130 | ||
edfaa7c3 KS |
1131 | static ssize_t disk_removable_show(struct device *dev, |
1132 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 1133 | { |
edfaa7c3 | 1134 | struct gendisk *disk = dev_to_disk(dev); |
a7fd6706 | 1135 | |
edfaa7c3 KS |
1136 | return sprintf(buf, "%d\n", |
1137 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
a7fd6706 KS |
1138 | } |
1139 | ||
8ddcd653 CH |
1140 | static ssize_t disk_hidden_show(struct device *dev, |
1141 | struct device_attribute *attr, char *buf) | |
1142 | { | |
1143 | struct gendisk *disk = dev_to_disk(dev); | |
1144 | ||
1145 | return sprintf(buf, "%d\n", | |
1146 | (disk->flags & GENHD_FL_HIDDEN ? 1 : 0)); | |
1147 | } | |
1148 | ||
1c9ce527 KS |
1149 | static ssize_t disk_ro_show(struct device *dev, |
1150 | struct device_attribute *attr, char *buf) | |
1151 | { | |
1152 | struct gendisk *disk = dev_to_disk(dev); | |
1153 | ||
b7db9956 | 1154 | return sprintf(buf, "%d\n", get_disk_ro(disk) ? 1 : 0); |
1c9ce527 KS |
1155 | } |
1156 | ||
edfaa7c3 KS |
1157 | static ssize_t disk_capability_show(struct device *dev, |
1158 | struct device_attribute *attr, char *buf) | |
86ce18d7 | 1159 | { |
edfaa7c3 KS |
1160 | struct gendisk *disk = dev_to_disk(dev); |
1161 | ||
1162 | return sprintf(buf, "%x\n", disk->flags); | |
86ce18d7 | 1163 | } |
edfaa7c3 | 1164 | |
c72758f3 MP |
1165 | static ssize_t disk_alignment_offset_show(struct device *dev, |
1166 | struct device_attribute *attr, | |
1167 | char *buf) | |
1168 | { | |
1169 | struct gendisk *disk = dev_to_disk(dev); | |
1170 | ||
1171 | return sprintf(buf, "%d\n", queue_alignment_offset(disk->queue)); | |
1172 | } | |
1173 | ||
86b37281 MP |
1174 | static ssize_t disk_discard_alignment_show(struct device *dev, |
1175 | struct device_attribute *attr, | |
1176 | char *buf) | |
1177 | { | |
1178 | struct gendisk *disk = dev_to_disk(dev); | |
1179 | ||
dd3d145d | 1180 | return sprintf(buf, "%d\n", queue_discard_alignment(disk->queue)); |
86b37281 MP |
1181 | } |
1182 | ||
5657a819 JP |
1183 | static DEVICE_ATTR(range, 0444, disk_range_show, NULL); |
1184 | static DEVICE_ATTR(ext_range, 0444, disk_ext_range_show, NULL); | |
1185 | static DEVICE_ATTR(removable, 0444, disk_removable_show, NULL); | |
1186 | static DEVICE_ATTR(hidden, 0444, disk_hidden_show, NULL); | |
1187 | static DEVICE_ATTR(ro, 0444, disk_ro_show, NULL); | |
1188 | static DEVICE_ATTR(size, 0444, part_size_show, NULL); | |
1189 | static DEVICE_ATTR(alignment_offset, 0444, disk_alignment_offset_show, NULL); | |
1190 | static DEVICE_ATTR(discard_alignment, 0444, disk_discard_alignment_show, NULL); | |
1191 | static DEVICE_ATTR(capability, 0444, disk_capability_show, NULL); | |
1192 | static DEVICE_ATTR(stat, 0444, part_stat_show, NULL); | |
1193 | static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL); | |
1194 | static DEVICE_ATTR(badblocks, 0644, disk_badblocks_show, disk_badblocks_store); | |
c17bb495 | 1195 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 | 1196 | static struct device_attribute dev_attr_fail = |
5657a819 | 1197 | __ATTR(make-it-fail, 0644, part_fail_show, part_fail_store); |
c17bb495 | 1198 | #endif |
581d4e28 JA |
1199 | #ifdef CONFIG_FAIL_IO_TIMEOUT |
1200 | static struct device_attribute dev_attr_fail_timeout = | |
5657a819 | 1201 | __ATTR(io-timeout-fail, 0644, part_timeout_show, part_timeout_store); |
581d4e28 | 1202 | #endif |
edfaa7c3 KS |
1203 | |
1204 | static struct attribute *disk_attrs[] = { | |
1205 | &dev_attr_range.attr, | |
1f014290 | 1206 | &dev_attr_ext_range.attr, |
edfaa7c3 | 1207 | &dev_attr_removable.attr, |
8ddcd653 | 1208 | &dev_attr_hidden.attr, |
1c9ce527 | 1209 | &dev_attr_ro.attr, |
edfaa7c3 | 1210 | &dev_attr_size.attr, |
c72758f3 | 1211 | &dev_attr_alignment_offset.attr, |
86b37281 | 1212 | &dev_attr_discard_alignment.attr, |
edfaa7c3 KS |
1213 | &dev_attr_capability.attr, |
1214 | &dev_attr_stat.attr, | |
316d315b | 1215 | &dev_attr_inflight.attr, |
99e6608c | 1216 | &dev_attr_badblocks.attr, |
edfaa7c3 KS |
1217 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
1218 | &dev_attr_fail.attr, | |
581d4e28 JA |
1219 | #endif |
1220 | #ifdef CONFIG_FAIL_IO_TIMEOUT | |
1221 | &dev_attr_fail_timeout.attr, | |
edfaa7c3 KS |
1222 | #endif |
1223 | NULL | |
1224 | }; | |
1225 | ||
9438b3e0 DW |
1226 | static umode_t disk_visible(struct kobject *kobj, struct attribute *a, int n) |
1227 | { | |
1228 | struct device *dev = container_of(kobj, typeof(*dev), kobj); | |
1229 | struct gendisk *disk = dev_to_disk(dev); | |
1230 | ||
1231 | if (a == &dev_attr_badblocks.attr && !disk->bb) | |
1232 | return 0; | |
1233 | return a->mode; | |
1234 | } | |
1235 | ||
edfaa7c3 KS |
1236 | static struct attribute_group disk_attr_group = { |
1237 | .attrs = disk_attrs, | |
9438b3e0 | 1238 | .is_visible = disk_visible, |
edfaa7c3 KS |
1239 | }; |
1240 | ||
a4dbd674 | 1241 | static const struct attribute_group *disk_attr_groups[] = { |
edfaa7c3 KS |
1242 | &disk_attr_group, |
1243 | NULL | |
1da177e4 LT |
1244 | }; |
1245 | ||
540eed56 TH |
1246 | /** |
1247 | * disk_replace_part_tbl - replace disk->part_tbl in RCU-safe way | |
1248 | * @disk: disk to replace part_tbl for | |
1249 | * @new_ptbl: new part_tbl to install | |
1250 | * | |
1251 | * Replace disk->part_tbl with @new_ptbl in RCU-safe way. The | |
1252 | * original ptbl is freed using RCU callback. | |
1253 | * | |
1254 | * LOCKING: | |
6d2cf6f2 | 1255 | * Matching bd_mutex locked or the caller is the only user of @disk. |
540eed56 TH |
1256 | */ |
1257 | static void disk_replace_part_tbl(struct gendisk *disk, | |
1258 | struct disk_part_tbl *new_ptbl) | |
1259 | { | |
6d2cf6f2 BVA |
1260 | struct disk_part_tbl *old_ptbl = |
1261 | rcu_dereference_protected(disk->part_tbl, 1); | |
540eed56 TH |
1262 | |
1263 | rcu_assign_pointer(disk->part_tbl, new_ptbl); | |
a6f23657 JA |
1264 | |
1265 | if (old_ptbl) { | |
1266 | rcu_assign_pointer(old_ptbl->last_lookup, NULL); | |
57bdfbf9 | 1267 | kfree_rcu(old_ptbl, rcu_head); |
a6f23657 | 1268 | } |
540eed56 TH |
1269 | } |
1270 | ||
1271 | /** | |
1272 | * disk_expand_part_tbl - expand disk->part_tbl | |
1273 | * @disk: disk to expand part_tbl for | |
1274 | * @partno: expand such that this partno can fit in | |
1275 | * | |
1276 | * Expand disk->part_tbl such that @partno can fit in. disk->part_tbl | |
1277 | * uses RCU to allow unlocked dereferencing for stats and other stuff. | |
1278 | * | |
1279 | * LOCKING: | |
6d2cf6f2 BVA |
1280 | * Matching bd_mutex locked or the caller is the only user of @disk. |
1281 | * Might sleep. | |
540eed56 TH |
1282 | * |
1283 | * RETURNS: | |
1284 | * 0 on success, -errno on failure. | |
1285 | */ | |
1286 | int disk_expand_part_tbl(struct gendisk *disk, int partno) | |
1287 | { | |
6d2cf6f2 BVA |
1288 | struct disk_part_tbl *old_ptbl = |
1289 | rcu_dereference_protected(disk->part_tbl, 1); | |
540eed56 TH |
1290 | struct disk_part_tbl *new_ptbl; |
1291 | int len = old_ptbl ? old_ptbl->len : 0; | |
5fabcb4c | 1292 | int i, target; |
5fabcb4c JA |
1293 | |
1294 | /* | |
1295 | * check for int overflow, since we can get here from blkpg_ioctl() | |
1296 | * with a user passed 'partno'. | |
1297 | */ | |
1298 | target = partno + 1; | |
1299 | if (target < 0) | |
1300 | return -EINVAL; | |
540eed56 TH |
1301 | |
1302 | /* disk_max_parts() is zero during initialization, ignore if so */ | |
1303 | if (disk_max_parts(disk) && target > disk_max_parts(disk)) | |
1304 | return -EINVAL; | |
1305 | ||
1306 | if (target <= len) | |
1307 | return 0; | |
1308 | ||
78b90a2c GS |
1309 | new_ptbl = kzalloc_node(struct_size(new_ptbl, part, target), GFP_KERNEL, |
1310 | disk->node_id); | |
540eed56 TH |
1311 | if (!new_ptbl) |
1312 | return -ENOMEM; | |
1313 | ||
540eed56 TH |
1314 | new_ptbl->len = target; |
1315 | ||
1316 | for (i = 0; i < len; i++) | |
1317 | rcu_assign_pointer(new_ptbl->part[i], old_ptbl->part[i]); | |
1318 | ||
1319 | disk_replace_part_tbl(disk, new_ptbl); | |
1320 | return 0; | |
1321 | } | |
1322 | ||
edfaa7c3 | 1323 | static void disk_release(struct device *dev) |
1da177e4 | 1324 | { |
edfaa7c3 KS |
1325 | struct gendisk *disk = dev_to_disk(dev); |
1326 | ||
2da78092 | 1327 | blk_free_devt(dev->devt); |
77ea887e | 1328 | disk_release_events(disk); |
1da177e4 | 1329 | kfree(disk->random); |
540eed56 | 1330 | disk_replace_part_tbl(disk, NULL); |
b54e5ed8 | 1331 | hd_free_part(&disk->part0); |
523e1d39 TH |
1332 | if (disk->queue) |
1333 | blk_put_queue(disk->queue); | |
1da177e4 LT |
1334 | kfree(disk); |
1335 | } | |
edfaa7c3 KS |
1336 | struct class block_class = { |
1337 | .name = "block", | |
1da177e4 LT |
1338 | }; |
1339 | ||
3c2670e6 | 1340 | static char *block_devnode(struct device *dev, umode_t *mode, |
4e4098a3 | 1341 | kuid_t *uid, kgid_t *gid) |
b03f38b6 KS |
1342 | { |
1343 | struct gendisk *disk = dev_to_disk(dev); | |
1344 | ||
e454cea2 KS |
1345 | if (disk->devnode) |
1346 | return disk->devnode(disk, mode); | |
b03f38b6 KS |
1347 | return NULL; |
1348 | } | |
1349 | ||
edf8ff55 | 1350 | static const struct device_type disk_type = { |
edfaa7c3 KS |
1351 | .name = "disk", |
1352 | .groups = disk_attr_groups, | |
1353 | .release = disk_release, | |
e454cea2 | 1354 | .devnode = block_devnode, |
1da177e4 LT |
1355 | }; |
1356 | ||
a6e2ba88 | 1357 | #ifdef CONFIG_PROC_FS |
cf771cb5 TH |
1358 | /* |
1359 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
1360 | * entries do, above, but makes them available through one seq_file. | |
1361 | * | |
1362 | * The output looks suspiciously like /proc/partitions with a bunch of | |
1363 | * extra fields. | |
1364 | */ | |
1365 | static int diskstats_show(struct seq_file *seqf, void *v) | |
1da177e4 LT |
1366 | { |
1367 | struct gendisk *gp = v; | |
e71bf0d0 TH |
1368 | struct disk_part_iter piter; |
1369 | struct hd_struct *hd; | |
1da177e4 | 1370 | char buf[BDEVNAME_SIZE]; |
e016b782 | 1371 | unsigned int inflight; |
1da177e4 LT |
1372 | |
1373 | /* | |
ed9e1982 | 1374 | if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) |
cf771cb5 | 1375 | seq_puts(seqf, "major minor name" |
1da177e4 LT |
1376 | " rio rmerge rsect ruse wio wmerge " |
1377 | "wsect wuse running use aveq" | |
1378 | "\n\n"); | |
1379 | */ | |
9f5e4865 | 1380 | |
71982a40 | 1381 | disk_part_iter_init(&piter, gp, DISK_PITER_INCL_EMPTY_PART0); |
e71bf0d0 | 1382 | while ((hd = disk_part_iter_next(&piter))) { |
e016b782 | 1383 | inflight = part_in_flight(gp->queue, hd); |
bdca3c87 MC |
1384 | seq_printf(seqf, "%4d %7d %s " |
1385 | "%lu %lu %lu %u " | |
1386 | "%lu %lu %lu %u " | |
1387 | "%u %u %u " | |
1388 | "%lu %lu %lu %u\n", | |
f331c029 TH |
1389 | MAJOR(part_devt(hd)), MINOR(part_devt(hd)), |
1390 | disk_name(gp, hd->partno, buf), | |
dbae2c55 MC |
1391 | part_stat_read(hd, ios[STAT_READ]), |
1392 | part_stat_read(hd, merges[STAT_READ]), | |
1393 | part_stat_read(hd, sectors[STAT_READ]), | |
b57e99b4 | 1394 | (unsigned int)part_stat_read_msecs(hd, STAT_READ), |
dbae2c55 MC |
1395 | part_stat_read(hd, ios[STAT_WRITE]), |
1396 | part_stat_read(hd, merges[STAT_WRITE]), | |
1397 | part_stat_read(hd, sectors[STAT_WRITE]), | |
b57e99b4 | 1398 | (unsigned int)part_stat_read_msecs(hd, STAT_WRITE), |
e016b782 | 1399 | inflight, |
28f39d55 | 1400 | jiffies_to_msecs(part_stat_read(hd, io_ticks)), |
bdca3c87 MC |
1401 | jiffies_to_msecs(part_stat_read(hd, time_in_queue)), |
1402 | part_stat_read(hd, ios[STAT_DISCARD]), | |
1403 | part_stat_read(hd, merges[STAT_DISCARD]), | |
1404 | part_stat_read(hd, sectors[STAT_DISCARD]), | |
b57e99b4 | 1405 | (unsigned int)part_stat_read_msecs(hd, STAT_DISCARD) |
28f39d55 | 1406 | ); |
1da177e4 | 1407 | } |
e71bf0d0 | 1408 | disk_part_iter_exit(&piter); |
9f5e4865 | 1409 | |
1da177e4 LT |
1410 | return 0; |
1411 | } | |
1412 | ||
31d85ab2 | 1413 | static const struct seq_operations diskstats_op = { |
def4e38d TH |
1414 | .start = disk_seqf_start, |
1415 | .next = disk_seqf_next, | |
1416 | .stop = disk_seqf_stop, | |
1da177e4 LT |
1417 | .show = diskstats_show |
1418 | }; | |
f500975a AD |
1419 | |
1420 | static int __init proc_genhd_init(void) | |
1421 | { | |
fddda2b7 CH |
1422 | proc_create_seq("diskstats", 0, NULL, &diskstats_op); |
1423 | proc_create_seq("partitions", 0, NULL, &partitions_op); | |
f500975a AD |
1424 | return 0; |
1425 | } | |
1426 | module_init(proc_genhd_init); | |
a6e2ba88 | 1427 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 1428 | |
cf771cb5 | 1429 | dev_t blk_lookup_devt(const char *name, int partno) |
a142be85 | 1430 | { |
def4e38d TH |
1431 | dev_t devt = MKDEV(0, 0); |
1432 | struct class_dev_iter iter; | |
1433 | struct device *dev; | |
a142be85 | 1434 | |
def4e38d TH |
1435 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); |
1436 | while ((dev = class_dev_iter_next(&iter))) { | |
a142be85 | 1437 | struct gendisk *disk = dev_to_disk(dev); |
548b10eb | 1438 | struct hd_struct *part; |
a142be85 | 1439 | |
3ada8b7e | 1440 | if (strcmp(dev_name(dev), name)) |
f331c029 | 1441 | continue; |
f331c029 | 1442 | |
41b8c853 NB |
1443 | if (partno < disk->minors) { |
1444 | /* We need to return the right devno, even | |
1445 | * if the partition doesn't exist yet. | |
1446 | */ | |
1447 | devt = MKDEV(MAJOR(dev->devt), | |
1448 | MINOR(dev->devt) + partno); | |
1449 | break; | |
1450 | } | |
548b10eb | 1451 | part = disk_get_part(disk, partno); |
2bbedcb4 | 1452 | if (part) { |
f331c029 | 1453 | devt = part_devt(part); |
e71bf0d0 | 1454 | disk_put_part(part); |
548b10eb | 1455 | break; |
def4e38d | 1456 | } |
548b10eb | 1457 | disk_put_part(part); |
5c0ef6d0 | 1458 | } |
def4e38d | 1459 | class_dev_iter_exit(&iter); |
edfaa7c3 KS |
1460 | return devt; |
1461 | } | |
edfaa7c3 KS |
1462 | EXPORT_SYMBOL(blk_lookup_devt); |
1463 | ||
e319e1fb | 1464 | struct gendisk *__alloc_disk_node(int minors, int node_id) |
1946089a CL |
1465 | { |
1466 | struct gendisk *disk; | |
6d2cf6f2 | 1467 | struct disk_part_tbl *ptbl; |
1946089a | 1468 | |
de65b012 CH |
1469 | if (minors > DISK_MAX_PARTS) { |
1470 | printk(KERN_ERR | |
7fb52621 | 1471 | "block: can't allocate more than %d partitions\n", |
de65b012 CH |
1472 | DISK_MAX_PARTS); |
1473 | minors = DISK_MAX_PARTS; | |
1474 | } | |
1946089a | 1475 | |
c1b511eb | 1476 | disk = kzalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id); |
1da177e4 | 1477 | if (disk) { |
074a7aca | 1478 | if (!init_part_stats(&disk->part0)) { |
1da177e4 LT |
1479 | kfree(disk); |
1480 | return NULL; | |
1481 | } | |
56c0908c | 1482 | init_rwsem(&disk->lookup_sem); |
bf91db18 | 1483 | disk->node_id = node_id; |
540eed56 TH |
1484 | if (disk_expand_part_tbl(disk, 0)) { |
1485 | free_part_stats(&disk->part0); | |
b5d0b9df TH |
1486 | kfree(disk); |
1487 | return NULL; | |
1da177e4 | 1488 | } |
6d2cf6f2 BVA |
1489 | ptbl = rcu_dereference_protected(disk->part_tbl, 1); |
1490 | rcu_assign_pointer(ptbl->part[0], &disk->part0); | |
6c23a968 | 1491 | |
c83f6bf9 VG |
1492 | /* |
1493 | * set_capacity() and get_capacity() currently don't use | |
1494 | * seqcounter to read/update the part0->nr_sects. Still init | |
1495 | * the counter as we can read the sectors in IO submission | |
1496 | * patch using seqence counters. | |
1497 | * | |
1498 | * TODO: Ideally set_capacity() and get_capacity() should be | |
1499 | * converted to make use of bd_mutex and sequence counters. | |
1500 | */ | |
1501 | seqcount_init(&disk->part0.nr_sects_seq); | |
6c71013e ML |
1502 | if (hd_ref_init(&disk->part0)) { |
1503 | hd_free_part(&disk->part0); | |
1504 | kfree(disk); | |
1505 | return NULL; | |
1506 | } | |
b5d0b9df | 1507 | |
1da177e4 | 1508 | disk->minors = minors; |
1da177e4 | 1509 | rand_initialize_disk(disk); |
ed9e1982 TH |
1510 | disk_to_dev(disk)->class = &block_class; |
1511 | disk_to_dev(disk)->type = &disk_type; | |
1512 | device_initialize(disk_to_dev(disk)); | |
1da177e4 LT |
1513 | } |
1514 | return disk; | |
1515 | } | |
e319e1fb | 1516 | EXPORT_SYMBOL(__alloc_disk_node); |
1da177e4 | 1517 | |
3079c22e | 1518 | struct kobject *get_disk_and_module(struct gendisk *disk) |
1da177e4 LT |
1519 | { |
1520 | struct module *owner; | |
1521 | struct kobject *kobj; | |
1522 | ||
1523 | if (!disk->fops) | |
1524 | return NULL; | |
1525 | owner = disk->fops->owner; | |
1526 | if (owner && !try_module_get(owner)) | |
1527 | return NULL; | |
d01b2dcb | 1528 | kobj = kobject_get_unless_zero(&disk_to_dev(disk)->kobj); |
1da177e4 LT |
1529 | if (kobj == NULL) { |
1530 | module_put(owner); | |
1531 | return NULL; | |
1532 | } | |
1533 | return kobj; | |
1534 | ||
1535 | } | |
3079c22e | 1536 | EXPORT_SYMBOL(get_disk_and_module); |
1da177e4 LT |
1537 | |
1538 | void put_disk(struct gendisk *disk) | |
1539 | { | |
1540 | if (disk) | |
ed9e1982 | 1541 | kobject_put(&disk_to_dev(disk)->kobj); |
1da177e4 | 1542 | } |
1da177e4 LT |
1543 | EXPORT_SYMBOL(put_disk); |
1544 | ||
9df6c299 JK |
1545 | /* |
1546 | * This is a counterpart of get_disk_and_module() and thus also of | |
1547 | * get_gendisk(). | |
1548 | */ | |
1549 | void put_disk_and_module(struct gendisk *disk) | |
1550 | { | |
1551 | if (disk) { | |
1552 | struct module *owner = disk->fops->owner; | |
1553 | ||
1554 | put_disk(disk); | |
1555 | module_put(owner); | |
1556 | } | |
1557 | } | |
1558 | EXPORT_SYMBOL(put_disk_and_module); | |
1559 | ||
e3264a4d HR |
1560 | static void set_disk_ro_uevent(struct gendisk *gd, int ro) |
1561 | { | |
1562 | char event[] = "DISK_RO=1"; | |
1563 | char *envp[] = { event, NULL }; | |
1564 | ||
1565 | if (!ro) | |
1566 | event[8] = '0'; | |
1567 | kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp); | |
1568 | } | |
1569 | ||
1da177e4 LT |
1570 | void set_device_ro(struct block_device *bdev, int flag) |
1571 | { | |
b7db9956 | 1572 | bdev->bd_part->policy = flag; |
1da177e4 LT |
1573 | } |
1574 | ||
1575 | EXPORT_SYMBOL(set_device_ro); | |
1576 | ||
1577 | void set_disk_ro(struct gendisk *disk, int flag) | |
1578 | { | |
e71bf0d0 TH |
1579 | struct disk_part_iter piter; |
1580 | struct hd_struct *part; | |
1581 | ||
e3264a4d HR |
1582 | if (disk->part0.policy != flag) { |
1583 | set_disk_ro_uevent(disk, flag); | |
1584 | disk->part0.policy = flag; | |
1585 | } | |
1586 | ||
1587 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); | |
e71bf0d0 TH |
1588 | while ((part = disk_part_iter_next(&piter))) |
1589 | part->policy = flag; | |
1590 | disk_part_iter_exit(&piter); | |
1da177e4 LT |
1591 | } |
1592 | ||
1593 | EXPORT_SYMBOL(set_disk_ro); | |
1594 | ||
1595 | int bdev_read_only(struct block_device *bdev) | |
1596 | { | |
1597 | if (!bdev) | |
1598 | return 0; | |
b7db9956 | 1599 | return bdev->bd_part->policy; |
1da177e4 LT |
1600 | } |
1601 | ||
1602 | EXPORT_SYMBOL(bdev_read_only); | |
1603 | ||
cf771cb5 | 1604 | int invalidate_partition(struct gendisk *disk, int partno) |
1da177e4 LT |
1605 | { |
1606 | int res = 0; | |
cf771cb5 | 1607 | struct block_device *bdev = bdget_disk(disk, partno); |
1da177e4 | 1608 | if (bdev) { |
2ef41634 | 1609 | fsync_bdev(bdev); |
93b270f7 | 1610 | res = __invalidate_device(bdev, true); |
1da177e4 LT |
1611 | bdput(bdev); |
1612 | } | |
1613 | return res; | |
1614 | } | |
1615 | ||
1616 | EXPORT_SYMBOL(invalidate_partition); | |
77ea887e TH |
1617 | |
1618 | /* | |
1619 | * Disk events - monitor disk events like media change and eject request. | |
1620 | */ | |
1621 | struct disk_events { | |
1622 | struct list_head node; /* all disk_event's */ | |
1623 | struct gendisk *disk; /* the associated disk */ | |
1624 | spinlock_t lock; | |
1625 | ||
fdd514e1 | 1626 | struct mutex block_mutex; /* protects blocking */ |
77ea887e TH |
1627 | int block; /* event blocking depth */ |
1628 | unsigned int pending; /* events already sent out */ | |
1629 | unsigned int clearing; /* events being cleared */ | |
1630 | ||
1631 | long poll_msecs; /* interval, -1 for default */ | |
1632 | struct delayed_work dwork; | |
1633 | }; | |
1634 | ||
1635 | static const char *disk_events_strs[] = { | |
1636 | [ilog2(DISK_EVENT_MEDIA_CHANGE)] = "media_change", | |
1637 | [ilog2(DISK_EVENT_EJECT_REQUEST)] = "eject_request", | |
1638 | }; | |
1639 | ||
1640 | static char *disk_uevents[] = { | |
1641 | [ilog2(DISK_EVENT_MEDIA_CHANGE)] = "DISK_MEDIA_CHANGE=1", | |
1642 | [ilog2(DISK_EVENT_EJECT_REQUEST)] = "DISK_EJECT_REQUEST=1", | |
1643 | }; | |
1644 | ||
1645 | /* list of all disk_events */ | |
1646 | static DEFINE_MUTEX(disk_events_mutex); | |
1647 | static LIST_HEAD(disk_events); | |
1648 | ||
1649 | /* disable in-kernel polling by default */ | |
1fe8f348 | 1650 | static unsigned long disk_events_dfl_poll_msecs; |
77ea887e TH |
1651 | |
1652 | static unsigned long disk_events_poll_jiffies(struct gendisk *disk) | |
1653 | { | |
1654 | struct disk_events *ev = disk->ev; | |
1655 | long intv_msecs = 0; | |
1656 | ||
1657 | /* | |
1658 | * If device-specific poll interval is set, always use it. If | |
673387a9 | 1659 | * the default is being used, poll if the POLL flag is set. |
77ea887e TH |
1660 | */ |
1661 | if (ev->poll_msecs >= 0) | |
1662 | intv_msecs = ev->poll_msecs; | |
c92e2f04 | 1663 | else if (disk->event_flags & DISK_EVENT_FLAG_POLL) |
77ea887e TH |
1664 | intv_msecs = disk_events_dfl_poll_msecs; |
1665 | ||
1666 | return msecs_to_jiffies(intv_msecs); | |
1667 | } | |
1668 | ||
c3af54af TH |
1669 | /** |
1670 | * disk_block_events - block and flush disk event checking | |
1671 | * @disk: disk to block events for | |
1672 | * | |
1673 | * On return from this function, it is guaranteed that event checking | |
1674 | * isn't in progress and won't happen until unblocked by | |
1675 | * disk_unblock_events(). Events blocking is counted and the actual | |
1676 | * unblocking happens after the matching number of unblocks are done. | |
1677 | * | |
1678 | * Note that this intentionally does not block event checking from | |
1679 | * disk_clear_events(). | |
1680 | * | |
1681 | * CONTEXT: | |
1682 | * Might sleep. | |
1683 | */ | |
1684 | void disk_block_events(struct gendisk *disk) | |
77ea887e TH |
1685 | { |
1686 | struct disk_events *ev = disk->ev; | |
1687 | unsigned long flags; | |
1688 | bool cancel; | |
1689 | ||
c3af54af TH |
1690 | if (!ev) |
1691 | return; | |
1692 | ||
fdd514e1 TH |
1693 | /* |
1694 | * Outer mutex ensures that the first blocker completes canceling | |
1695 | * the event work before further blockers are allowed to finish. | |
1696 | */ | |
1697 | mutex_lock(&ev->block_mutex); | |
1698 | ||
77ea887e TH |
1699 | spin_lock_irqsave(&ev->lock, flags); |
1700 | cancel = !ev->block++; | |
1701 | spin_unlock_irqrestore(&ev->lock, flags); | |
1702 | ||
c3af54af TH |
1703 | if (cancel) |
1704 | cancel_delayed_work_sync(&disk->ev->dwork); | |
fdd514e1 TH |
1705 | |
1706 | mutex_unlock(&ev->block_mutex); | |
77ea887e TH |
1707 | } |
1708 | ||
1709 | static void __disk_unblock_events(struct gendisk *disk, bool check_now) | |
1710 | { | |
1711 | struct disk_events *ev = disk->ev; | |
1712 | unsigned long intv; | |
1713 | unsigned long flags; | |
1714 | ||
1715 | spin_lock_irqsave(&ev->lock, flags); | |
1716 | ||
1717 | if (WARN_ON_ONCE(ev->block <= 0)) | |
1718 | goto out_unlock; | |
1719 | ||
1720 | if (--ev->block) | |
1721 | goto out_unlock; | |
1722 | ||
77ea887e | 1723 | intv = disk_events_poll_jiffies(disk); |
77ea887e | 1724 | if (check_now) |
695588f9 VK |
1725 | queue_delayed_work(system_freezable_power_efficient_wq, |
1726 | &ev->dwork, 0); | |
77ea887e | 1727 | else if (intv) |
695588f9 VK |
1728 | queue_delayed_work(system_freezable_power_efficient_wq, |
1729 | &ev->dwork, intv); | |
77ea887e TH |
1730 | out_unlock: |
1731 | spin_unlock_irqrestore(&ev->lock, flags); | |
1732 | } | |
1733 | ||
77ea887e TH |
1734 | /** |
1735 | * disk_unblock_events - unblock disk event checking | |
1736 | * @disk: disk to unblock events for | |
1737 | * | |
1738 | * Undo disk_block_events(). When the block count reaches zero, it | |
1739 | * starts events polling if configured. | |
1740 | * | |
1741 | * CONTEXT: | |
1742 | * Don't care. Safe to call from irq context. | |
1743 | */ | |
1744 | void disk_unblock_events(struct gendisk *disk) | |
1745 | { | |
1746 | if (disk->ev) | |
facc31dd | 1747 | __disk_unblock_events(disk, false); |
77ea887e TH |
1748 | } |
1749 | ||
1750 | /** | |
85ef06d1 TH |
1751 | * disk_flush_events - schedule immediate event checking and flushing |
1752 | * @disk: disk to check and flush events for | |
1753 | * @mask: events to flush | |
77ea887e | 1754 | * |
85ef06d1 TH |
1755 | * Schedule immediate event checking on @disk if not blocked. Events in |
1756 | * @mask are scheduled to be cleared from the driver. Note that this | |
1757 | * doesn't clear the events from @disk->ev. | |
77ea887e TH |
1758 | * |
1759 | * CONTEXT: | |
85ef06d1 | 1760 | * If @mask is non-zero must be called with bdev->bd_mutex held. |
77ea887e | 1761 | */ |
85ef06d1 | 1762 | void disk_flush_events(struct gendisk *disk, unsigned int mask) |
77ea887e | 1763 | { |
a9dce2a3 | 1764 | struct disk_events *ev = disk->ev; |
a9dce2a3 TH |
1765 | |
1766 | if (!ev) | |
1767 | return; | |
1768 | ||
85ef06d1 TH |
1769 | spin_lock_irq(&ev->lock); |
1770 | ev->clearing |= mask; | |
41f63c53 | 1771 | if (!ev->block) |
695588f9 VK |
1772 | mod_delayed_work(system_freezable_power_efficient_wq, |
1773 | &ev->dwork, 0); | |
85ef06d1 | 1774 | spin_unlock_irq(&ev->lock); |
77ea887e | 1775 | } |
77ea887e TH |
1776 | |
1777 | /** | |
1778 | * disk_clear_events - synchronously check, clear and return pending events | |
1779 | * @disk: disk to fetch and clear events from | |
da3dae54 | 1780 | * @mask: mask of events to be fetched and cleared |
77ea887e TH |
1781 | * |
1782 | * Disk events are synchronously checked and pending events in @mask | |
1783 | * are cleared and returned. This ignores the block count. | |
1784 | * | |
1785 | * CONTEXT: | |
1786 | * Might sleep. | |
1787 | */ | |
1788 | unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask) | |
1789 | { | |
1790 | const struct block_device_operations *bdops = disk->fops; | |
1791 | struct disk_events *ev = disk->ev; | |
1792 | unsigned int pending; | |
12c2bdb2 | 1793 | unsigned int clearing = mask; |
77ea887e TH |
1794 | |
1795 | if (!ev) { | |
1796 | /* for drivers still using the old ->media_changed method */ | |
1797 | if ((mask & DISK_EVENT_MEDIA_CHANGE) && | |
1798 | bdops->media_changed && bdops->media_changed(disk)) | |
1799 | return DISK_EVENT_MEDIA_CHANGE; | |
1800 | return 0; | |
1801 | } | |
1802 | ||
12c2bdb2 DB |
1803 | disk_block_events(disk); |
1804 | ||
1805 | /* | |
1806 | * store the union of mask and ev->clearing on the stack so that the | |
1807 | * race with disk_flush_events does not cause ambiguity (ev->clearing | |
1808 | * can still be modified even if events are blocked). | |
1809 | */ | |
77ea887e | 1810 | spin_lock_irq(&ev->lock); |
12c2bdb2 DB |
1811 | clearing |= ev->clearing; |
1812 | ev->clearing = 0; | |
77ea887e TH |
1813 | spin_unlock_irq(&ev->lock); |
1814 | ||
12c2bdb2 | 1815 | disk_check_events(ev, &clearing); |
aea24a8b | 1816 | /* |
12c2bdb2 DB |
1817 | * if ev->clearing is not 0, the disk_flush_events got called in the |
1818 | * middle of this function, so we want to run the workfn without delay. | |
aea24a8b | 1819 | */ |
12c2bdb2 | 1820 | __disk_unblock_events(disk, ev->clearing ? true : false); |
77ea887e TH |
1821 | |
1822 | /* then, fetch and clear pending events */ | |
1823 | spin_lock_irq(&ev->lock); | |
77ea887e TH |
1824 | pending = ev->pending & mask; |
1825 | ev->pending &= ~mask; | |
1826 | spin_unlock_irq(&ev->lock); | |
12c2bdb2 | 1827 | WARN_ON_ONCE(clearing & mask); |
77ea887e TH |
1828 | |
1829 | return pending; | |
1830 | } | |
1831 | ||
12c2bdb2 DB |
1832 | /* |
1833 | * Separate this part out so that a different pointer for clearing_ptr can be | |
1834 | * passed in for disk_clear_events. | |
1835 | */ | |
77ea887e TH |
1836 | static void disk_events_workfn(struct work_struct *work) |
1837 | { | |
1838 | struct delayed_work *dwork = to_delayed_work(work); | |
1839 | struct disk_events *ev = container_of(dwork, struct disk_events, dwork); | |
12c2bdb2 DB |
1840 | |
1841 | disk_check_events(ev, &ev->clearing); | |
1842 | } | |
1843 | ||
1844 | static void disk_check_events(struct disk_events *ev, | |
1845 | unsigned int *clearing_ptr) | |
1846 | { | |
77ea887e TH |
1847 | struct gendisk *disk = ev->disk; |
1848 | char *envp[ARRAY_SIZE(disk_uevents) + 1] = { }; | |
12c2bdb2 | 1849 | unsigned int clearing = *clearing_ptr; |
77ea887e TH |
1850 | unsigned int events; |
1851 | unsigned long intv; | |
1852 | int nr_events = 0, i; | |
1853 | ||
1854 | /* check events */ | |
1855 | events = disk->fops->check_events(disk, clearing); | |
1856 | ||
1857 | /* accumulate pending events and schedule next poll if necessary */ | |
1858 | spin_lock_irq(&ev->lock); | |
1859 | ||
1860 | events &= ~ev->pending; | |
1861 | ev->pending |= events; | |
12c2bdb2 | 1862 | *clearing_ptr &= ~clearing; |
77ea887e TH |
1863 | |
1864 | intv = disk_events_poll_jiffies(disk); | |
1865 | if (!ev->block && intv) | |
695588f9 VK |
1866 | queue_delayed_work(system_freezable_power_efficient_wq, |
1867 | &ev->dwork, intv); | |
77ea887e TH |
1868 | |
1869 | spin_unlock_irq(&ev->lock); | |
1870 | ||
7c88a168 TH |
1871 | /* |
1872 | * Tell userland about new events. Only the events listed in | |
c92e2f04 MW |
1873 | * @disk->events are reported, and only if DISK_EVENT_FLAG_UEVENT |
1874 | * is set. Otherwise, events are processed internally but never | |
1875 | * get reported to userland. | |
7c88a168 | 1876 | */ |
77ea887e | 1877 | for (i = 0; i < ARRAY_SIZE(disk_uevents); i++) |
c92e2f04 MW |
1878 | if ((events & disk->events & (1 << i)) && |
1879 | (disk->event_flags & DISK_EVENT_FLAG_UEVENT)) | |
77ea887e TH |
1880 | envp[nr_events++] = disk_uevents[i]; |
1881 | ||
1882 | if (nr_events) | |
1883 | kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp); | |
1884 | } | |
1885 | ||
1886 | /* | |
1887 | * A disk events enabled device has the following sysfs nodes under | |
1888 | * its /sys/block/X/ directory. | |
1889 | * | |
1890 | * events : list of all supported events | |
1891 | * events_async : list of events which can be detected w/o polling | |
673387a9 | 1892 | * (always empty, only for backwards compatibility) |
77ea887e TH |
1893 | * events_poll_msecs : polling interval, 0: disable, -1: system default |
1894 | */ | |
1895 | static ssize_t __disk_events_show(unsigned int events, char *buf) | |
1896 | { | |
1897 | const char *delim = ""; | |
1898 | ssize_t pos = 0; | |
1899 | int i; | |
1900 | ||
1901 | for (i = 0; i < ARRAY_SIZE(disk_events_strs); i++) | |
1902 | if (events & (1 << i)) { | |
1903 | pos += sprintf(buf + pos, "%s%s", | |
1904 | delim, disk_events_strs[i]); | |
1905 | delim = " "; | |
1906 | } | |
1907 | if (pos) | |
1908 | pos += sprintf(buf + pos, "\n"); | |
1909 | return pos; | |
1910 | } | |
1911 | ||
1912 | static ssize_t disk_events_show(struct device *dev, | |
1913 | struct device_attribute *attr, char *buf) | |
1914 | { | |
1915 | struct gendisk *disk = dev_to_disk(dev); | |
1916 | ||
c92e2f04 MW |
1917 | if (!(disk->event_flags & DISK_EVENT_FLAG_UEVENT)) |
1918 | return 0; | |
1919 | ||
77ea887e TH |
1920 | return __disk_events_show(disk->events, buf); |
1921 | } | |
1922 | ||
1923 | static ssize_t disk_events_async_show(struct device *dev, | |
1924 | struct device_attribute *attr, char *buf) | |
1925 | { | |
673387a9 | 1926 | return 0; |
77ea887e TH |
1927 | } |
1928 | ||
1929 | static ssize_t disk_events_poll_msecs_show(struct device *dev, | |
1930 | struct device_attribute *attr, | |
1931 | char *buf) | |
1932 | { | |
1933 | struct gendisk *disk = dev_to_disk(dev); | |
1934 | ||
cdf3e3de MW |
1935 | if (!disk->ev) |
1936 | return sprintf(buf, "-1\n"); | |
1937 | ||
77ea887e TH |
1938 | return sprintf(buf, "%ld\n", disk->ev->poll_msecs); |
1939 | } | |
1940 | ||
1941 | static ssize_t disk_events_poll_msecs_store(struct device *dev, | |
1942 | struct device_attribute *attr, | |
1943 | const char *buf, size_t count) | |
1944 | { | |
1945 | struct gendisk *disk = dev_to_disk(dev); | |
1946 | long intv; | |
1947 | ||
1948 | if (!count || !sscanf(buf, "%ld", &intv)) | |
1949 | return -EINVAL; | |
1950 | ||
1951 | if (intv < 0 && intv != -1) | |
1952 | return -EINVAL; | |
1953 | ||
cdf3e3de MW |
1954 | if (!disk->ev) |
1955 | return -ENODEV; | |
1956 | ||
c3af54af | 1957 | disk_block_events(disk); |
77ea887e TH |
1958 | disk->ev->poll_msecs = intv; |
1959 | __disk_unblock_events(disk, true); | |
1960 | ||
1961 | return count; | |
1962 | } | |
1963 | ||
5657a819 JP |
1964 | static const DEVICE_ATTR(events, 0444, disk_events_show, NULL); |
1965 | static const DEVICE_ATTR(events_async, 0444, disk_events_async_show, NULL); | |
1966 | static const DEVICE_ATTR(events_poll_msecs, 0644, | |
77ea887e TH |
1967 | disk_events_poll_msecs_show, |
1968 | disk_events_poll_msecs_store); | |
1969 | ||
1970 | static const struct attribute *disk_events_attrs[] = { | |
1971 | &dev_attr_events.attr, | |
1972 | &dev_attr_events_async.attr, | |
1973 | &dev_attr_events_poll_msecs.attr, | |
1974 | NULL, | |
1975 | }; | |
1976 | ||
1977 | /* | |
1978 | * The default polling interval can be specified by the kernel | |
1979 | * parameter block.events_dfl_poll_msecs which defaults to 0 | |
1980 | * (disable). This can also be modified runtime by writing to | |
1624b0b2 | 1981 | * /sys/module/block/parameters/events_dfl_poll_msecs. |
77ea887e TH |
1982 | */ |
1983 | static int disk_events_set_dfl_poll_msecs(const char *val, | |
1984 | const struct kernel_param *kp) | |
1985 | { | |
1986 | struct disk_events *ev; | |
1987 | int ret; | |
1988 | ||
1989 | ret = param_set_ulong(val, kp); | |
1990 | if (ret < 0) | |
1991 | return ret; | |
1992 | ||
1993 | mutex_lock(&disk_events_mutex); | |
1994 | ||
1995 | list_for_each_entry(ev, &disk_events, node) | |
85ef06d1 | 1996 | disk_flush_events(ev->disk, 0); |
77ea887e TH |
1997 | |
1998 | mutex_unlock(&disk_events_mutex); | |
1999 | ||
2000 | return 0; | |
2001 | } | |
2002 | ||
2003 | static const struct kernel_param_ops disk_events_dfl_poll_msecs_param_ops = { | |
2004 | .set = disk_events_set_dfl_poll_msecs, | |
2005 | .get = param_get_ulong, | |
2006 | }; | |
2007 | ||
2008 | #undef MODULE_PARAM_PREFIX | |
2009 | #define MODULE_PARAM_PREFIX "block." | |
2010 | ||
2011 | module_param_cb(events_dfl_poll_msecs, &disk_events_dfl_poll_msecs_param_ops, | |
2012 | &disk_events_dfl_poll_msecs, 0644); | |
2013 | ||
2014 | /* | |
9f53d2fe | 2015 | * disk_{alloc|add|del|release}_events - initialize and destroy disk_events. |
77ea887e | 2016 | */ |
9f53d2fe | 2017 | static void disk_alloc_events(struct gendisk *disk) |
77ea887e TH |
2018 | { |
2019 | struct disk_events *ev; | |
2020 | ||
cdf3e3de | 2021 | if (!disk->fops->check_events || !disk->events) |
77ea887e TH |
2022 | return; |
2023 | ||
2024 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
2025 | if (!ev) { | |
2026 | pr_warn("%s: failed to initialize events\n", disk->disk_name); | |
2027 | return; | |
2028 | } | |
2029 | ||
77ea887e TH |
2030 | INIT_LIST_HEAD(&ev->node); |
2031 | ev->disk = disk; | |
2032 | spin_lock_init(&ev->lock); | |
fdd514e1 | 2033 | mutex_init(&ev->block_mutex); |
77ea887e TH |
2034 | ev->block = 1; |
2035 | ev->poll_msecs = -1; | |
2036 | INIT_DELAYED_WORK(&ev->dwork, disk_events_workfn); | |
2037 | ||
9f53d2fe SG |
2038 | disk->ev = ev; |
2039 | } | |
2040 | ||
2041 | static void disk_add_events(struct gendisk *disk) | |
2042 | { | |
9f53d2fe SG |
2043 | /* FIXME: error handling */ |
2044 | if (sysfs_create_files(&disk_to_dev(disk)->kobj, disk_events_attrs) < 0) | |
2045 | pr_warn("%s: failed to create sysfs files for events\n", | |
2046 | disk->disk_name); | |
2047 | ||
cdf3e3de MW |
2048 | if (!disk->ev) |
2049 | return; | |
2050 | ||
77ea887e | 2051 | mutex_lock(&disk_events_mutex); |
9f53d2fe | 2052 | list_add_tail(&disk->ev->node, &disk_events); |
77ea887e TH |
2053 | mutex_unlock(&disk_events_mutex); |
2054 | ||
2055 | /* | |
2056 | * Block count is initialized to 1 and the following initial | |
2057 | * unblock kicks it into action. | |
2058 | */ | |
2059 | __disk_unblock_events(disk, true); | |
2060 | } | |
2061 | ||
2062 | static void disk_del_events(struct gendisk *disk) | |
2063 | { | |
cdf3e3de MW |
2064 | if (disk->ev) { |
2065 | disk_block_events(disk); | |
77ea887e | 2066 | |
cdf3e3de MW |
2067 | mutex_lock(&disk_events_mutex); |
2068 | list_del_init(&disk->ev->node); | |
2069 | mutex_unlock(&disk_events_mutex); | |
2070 | } | |
77ea887e TH |
2071 | |
2072 | sysfs_remove_files(&disk_to_dev(disk)->kobj, disk_events_attrs); | |
2073 | } | |
2074 | ||
2075 | static void disk_release_events(struct gendisk *disk) | |
2076 | { | |
2077 | /* the block count should be 1 from disk_del_events() */ | |
2078 | WARN_ON_ONCE(disk->ev && disk->ev->block != 1); | |
2079 | kfree(disk->ev); | |
2080 | } |