Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2001 Sistina Software (UK) Limited. | |
d5816876 | 3 | * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
1da177e4 LT |
4 | * |
5 | * This file is released under the GPL. | |
6 | */ | |
7 | ||
8 | #include "dm.h" | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/vmalloc.h> | |
12 | #include <linux/blkdev.h> | |
13 | #include <linux/namei.h> | |
14 | #include <linux/ctype.h> | |
e7d2860b | 15 | #include <linux/string.h> |
1da177e4 LT |
16 | #include <linux/slab.h> |
17 | #include <linux/interrupt.h> | |
48c9c27b | 18 | #include <linux/mutex.h> |
d5816876 | 19 | #include <linux/delay.h> |
60063497 | 20 | #include <linux/atomic.h> |
bfebd1cd | 21 | #include <linux/blk-mq.h> |
1da177e4 | 22 | |
72d94861 AK |
23 | #define DM_MSG_PREFIX "table" |
24 | ||
1da177e4 LT |
25 | #define MAX_DEPTH 16 |
26 | #define NODE_SIZE L1_CACHE_BYTES | |
27 | #define KEYS_PER_NODE (NODE_SIZE / sizeof(sector_t)) | |
28 | #define CHILDREN_PER_NODE (KEYS_PER_NODE + 1) | |
29 | ||
30 | struct dm_table { | |
1134e5ae | 31 | struct mapped_device *md; |
e6ee8c0b | 32 | unsigned type; |
1da177e4 LT |
33 | |
34 | /* btree table */ | |
35 | unsigned int depth; | |
36 | unsigned int counts[MAX_DEPTH]; /* in nodes */ | |
37 | sector_t *index[MAX_DEPTH]; | |
38 | ||
39 | unsigned int num_targets; | |
40 | unsigned int num_allocated; | |
41 | sector_t *highs; | |
42 | struct dm_target *targets; | |
43 | ||
36a0456f | 44 | struct target_type *immutable_target_type; |
a91a2785 | 45 | unsigned integrity_supported:1; |
3791e2fc | 46 | unsigned singleton:1; |
5ae89a87 | 47 | |
1da177e4 LT |
48 | /* |
49 | * Indicates the rw permissions for the new logical | |
50 | * device. This should be a combination of FMODE_READ | |
51 | * and FMODE_WRITE. | |
52 | */ | |
aeb5d727 | 53 | fmode_t mode; |
1da177e4 LT |
54 | |
55 | /* a list of devices used by this table */ | |
56 | struct list_head devices; | |
57 | ||
1da177e4 LT |
58 | /* events get handed up using this callback */ |
59 | void (*event_fn)(void *); | |
60 | void *event_context; | |
e6ee8c0b KU |
61 | |
62 | struct dm_md_mempools *mempools; | |
9d357b07 N |
63 | |
64 | struct list_head target_callbacks; | |
1da177e4 LT |
65 | }; |
66 | ||
67 | /* | |
68 | * Similar to ceiling(log_size(n)) | |
69 | */ | |
70 | static unsigned int int_log(unsigned int n, unsigned int base) | |
71 | { | |
72 | int result = 0; | |
73 | ||
74 | while (n > 1) { | |
75 | n = dm_div_up(n, base); | |
76 | result++; | |
77 | } | |
78 | ||
79 | return result; | |
80 | } | |
81 | ||
1da177e4 LT |
82 | /* |
83 | * Calculate the index of the child node of the n'th node k'th key. | |
84 | */ | |
85 | static inline unsigned int get_child(unsigned int n, unsigned int k) | |
86 | { | |
87 | return (n * CHILDREN_PER_NODE) + k; | |
88 | } | |
89 | ||
90 | /* | |
91 | * Return the n'th node of level l from table t. | |
92 | */ | |
93 | static inline sector_t *get_node(struct dm_table *t, | |
94 | unsigned int l, unsigned int n) | |
95 | { | |
96 | return t->index[l] + (n * KEYS_PER_NODE); | |
97 | } | |
98 | ||
99 | /* | |
100 | * Return the highest key that you could lookup from the n'th | |
101 | * node on level l of the btree. | |
102 | */ | |
103 | static sector_t high(struct dm_table *t, unsigned int l, unsigned int n) | |
104 | { | |
105 | for (; l < t->depth - 1; l++) | |
106 | n = get_child(n, CHILDREN_PER_NODE - 1); | |
107 | ||
108 | if (n >= t->counts[l]) | |
109 | return (sector_t) - 1; | |
110 | ||
111 | return get_node(t, l, n)[KEYS_PER_NODE - 1]; | |
112 | } | |
113 | ||
114 | /* | |
115 | * Fills in a level of the btree based on the highs of the level | |
116 | * below it. | |
117 | */ | |
118 | static int setup_btree_index(unsigned int l, struct dm_table *t) | |
119 | { | |
120 | unsigned int n, k; | |
121 | sector_t *node; | |
122 | ||
123 | for (n = 0U; n < t->counts[l]; n++) { | |
124 | node = get_node(t, l, n); | |
125 | ||
126 | for (k = 0U; k < KEYS_PER_NODE; k++) | |
127 | node[k] = high(t, l + 1, get_child(n, k)); | |
128 | } | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
133 | void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size) | |
134 | { | |
135 | unsigned long size; | |
136 | void *addr; | |
137 | ||
138 | /* | |
139 | * Check that we're not going to overflow. | |
140 | */ | |
141 | if (nmemb > (ULONG_MAX / elem_size)) | |
142 | return NULL; | |
143 | ||
144 | size = nmemb * elem_size; | |
e29e65aa | 145 | addr = vzalloc(size); |
1da177e4 LT |
146 | |
147 | return addr; | |
148 | } | |
08649012 | 149 | EXPORT_SYMBOL(dm_vcalloc); |
1da177e4 LT |
150 | |
151 | /* | |
152 | * highs, and targets are managed as dynamic arrays during a | |
153 | * table load. | |
154 | */ | |
155 | static int alloc_targets(struct dm_table *t, unsigned int num) | |
156 | { | |
157 | sector_t *n_highs; | |
158 | struct dm_target *n_targets; | |
1da177e4 LT |
159 | |
160 | /* | |
161 | * Allocate both the target array and offset array at once. | |
512875bd JN |
162 | * Append an empty entry to catch sectors beyond the end of |
163 | * the device. | |
1da177e4 | 164 | */ |
512875bd | 165 | n_highs = (sector_t *) dm_vcalloc(num + 1, sizeof(struct dm_target) + |
1da177e4 LT |
166 | sizeof(sector_t)); |
167 | if (!n_highs) | |
168 | return -ENOMEM; | |
169 | ||
170 | n_targets = (struct dm_target *) (n_highs + num); | |
171 | ||
57a2f238 | 172 | memset(n_highs, -1, sizeof(*n_highs) * num); |
1da177e4 LT |
173 | vfree(t->highs); |
174 | ||
175 | t->num_allocated = num; | |
176 | t->highs = n_highs; | |
177 | t->targets = n_targets; | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
aeb5d727 | 182 | int dm_table_create(struct dm_table **result, fmode_t mode, |
1134e5ae | 183 | unsigned num_targets, struct mapped_device *md) |
1da177e4 | 184 | { |
094262db | 185 | struct dm_table *t = kzalloc(sizeof(*t), GFP_KERNEL); |
1da177e4 LT |
186 | |
187 | if (!t) | |
188 | return -ENOMEM; | |
189 | ||
1da177e4 | 190 | INIT_LIST_HEAD(&t->devices); |
9d357b07 | 191 | INIT_LIST_HEAD(&t->target_callbacks); |
1da177e4 LT |
192 | |
193 | if (!num_targets) | |
194 | num_targets = KEYS_PER_NODE; | |
195 | ||
196 | num_targets = dm_round_up(num_targets, KEYS_PER_NODE); | |
197 | ||
5b2d0657 MP |
198 | if (!num_targets) { |
199 | kfree(t); | |
200 | return -ENOMEM; | |
201 | } | |
202 | ||
1da177e4 LT |
203 | if (alloc_targets(t, num_targets)) { |
204 | kfree(t); | |
1da177e4 LT |
205 | return -ENOMEM; |
206 | } | |
207 | ||
208 | t->mode = mode; | |
1134e5ae | 209 | t->md = md; |
1da177e4 LT |
210 | *result = t; |
211 | return 0; | |
212 | } | |
213 | ||
86f1152b | 214 | static void free_devices(struct list_head *devices, struct mapped_device *md) |
1da177e4 LT |
215 | { |
216 | struct list_head *tmp, *next; | |
217 | ||
afb24528 | 218 | list_for_each_safe(tmp, next, devices) { |
82b1519b MP |
219 | struct dm_dev_internal *dd = |
220 | list_entry(tmp, struct dm_dev_internal, list); | |
86f1152b BM |
221 | DMWARN("%s: dm_table_destroy: dm_put_device call missing for %s", |
222 | dm_device_name(md), dd->dm_dev->name); | |
223 | dm_put_table_device(md, dd->dm_dev); | |
1da177e4 LT |
224 | kfree(dd); |
225 | } | |
226 | } | |
227 | ||
d5816876 | 228 | void dm_table_destroy(struct dm_table *t) |
1da177e4 LT |
229 | { |
230 | unsigned int i; | |
231 | ||
a7940155 AK |
232 | if (!t) |
233 | return; | |
234 | ||
26803b9f | 235 | /* free the indexes */ |
1da177e4 LT |
236 | if (t->depth >= 2) |
237 | vfree(t->index[t->depth - 2]); | |
238 | ||
239 | /* free the targets */ | |
240 | for (i = 0; i < t->num_targets; i++) { | |
241 | struct dm_target *tgt = t->targets + i; | |
242 | ||
243 | if (tgt->type->dtr) | |
244 | tgt->type->dtr(tgt); | |
245 | ||
246 | dm_put_target_type(tgt->type); | |
247 | } | |
248 | ||
249 | vfree(t->highs); | |
250 | ||
251 | /* free the device list */ | |
86f1152b | 252 | free_devices(&t->devices, t->md); |
1da177e4 | 253 | |
e6ee8c0b KU |
254 | dm_free_md_mempools(t->mempools); |
255 | ||
1da177e4 LT |
256 | kfree(t); |
257 | } | |
258 | ||
1da177e4 LT |
259 | /* |
260 | * See if we've already got a device in the list. | |
261 | */ | |
82b1519b | 262 | static struct dm_dev_internal *find_device(struct list_head *l, dev_t dev) |
1da177e4 | 263 | { |
82b1519b | 264 | struct dm_dev_internal *dd; |
1da177e4 LT |
265 | |
266 | list_for_each_entry (dd, l, list) | |
86f1152b | 267 | if (dd->dm_dev->bdev->bd_dev == dev) |
1da177e4 LT |
268 | return dd; |
269 | ||
270 | return NULL; | |
271 | } | |
272 | ||
1da177e4 | 273 | /* |
f6a1ed10 | 274 | * If possible, this checks an area of a destination device is invalid. |
1da177e4 | 275 | */ |
f6a1ed10 MP |
276 | static int device_area_is_invalid(struct dm_target *ti, struct dm_dev *dev, |
277 | sector_t start, sector_t len, void *data) | |
1da177e4 | 278 | { |
f4808ca9 | 279 | struct request_queue *q; |
754c5fc7 MS |
280 | struct queue_limits *limits = data; |
281 | struct block_device *bdev = dev->bdev; | |
282 | sector_t dev_size = | |
283 | i_size_read(bdev->bd_inode) >> SECTOR_SHIFT; | |
02acc3a4 | 284 | unsigned short logical_block_size_sectors = |
754c5fc7 | 285 | limits->logical_block_size >> SECTOR_SHIFT; |
02acc3a4 | 286 | char b[BDEVNAME_SIZE]; |
2cd54d9b | 287 | |
f4808ca9 MB |
288 | /* |
289 | * Some devices exist without request functions, | |
290 | * such as loop devices not yet bound to backing files. | |
291 | * Forbid the use of such devices. | |
292 | */ | |
293 | q = bdev_get_queue(bdev); | |
294 | if (!q || !q->make_request_fn) { | |
295 | DMWARN("%s: %s is not yet initialised: " | |
296 | "start=%llu, len=%llu, dev_size=%llu", | |
297 | dm_device_name(ti->table->md), bdevname(bdev, b), | |
298 | (unsigned long long)start, | |
299 | (unsigned long long)len, | |
300 | (unsigned long long)dev_size); | |
301 | return 1; | |
302 | } | |
303 | ||
2cd54d9b | 304 | if (!dev_size) |
f6a1ed10 | 305 | return 0; |
2cd54d9b | 306 | |
5dea271b | 307 | if ((start >= dev_size) || (start + len > dev_size)) { |
a963a956 MS |
308 | DMWARN("%s: %s too small for target: " |
309 | "start=%llu, len=%llu, dev_size=%llu", | |
310 | dm_device_name(ti->table->md), bdevname(bdev, b), | |
311 | (unsigned long long)start, | |
312 | (unsigned long long)len, | |
313 | (unsigned long long)dev_size); | |
f6a1ed10 | 314 | return 1; |
02acc3a4 MS |
315 | } |
316 | ||
317 | if (logical_block_size_sectors <= 1) | |
f6a1ed10 | 318 | return 0; |
02acc3a4 MS |
319 | |
320 | if (start & (logical_block_size_sectors - 1)) { | |
321 | DMWARN("%s: start=%llu not aligned to h/w " | |
a963a956 | 322 | "logical block size %u of %s", |
02acc3a4 MS |
323 | dm_device_name(ti->table->md), |
324 | (unsigned long long)start, | |
754c5fc7 | 325 | limits->logical_block_size, bdevname(bdev, b)); |
f6a1ed10 | 326 | return 1; |
02acc3a4 MS |
327 | } |
328 | ||
5dea271b | 329 | if (len & (logical_block_size_sectors - 1)) { |
02acc3a4 | 330 | DMWARN("%s: len=%llu not aligned to h/w " |
a963a956 | 331 | "logical block size %u of %s", |
02acc3a4 | 332 | dm_device_name(ti->table->md), |
5dea271b | 333 | (unsigned long long)len, |
754c5fc7 | 334 | limits->logical_block_size, bdevname(bdev, b)); |
f6a1ed10 | 335 | return 1; |
02acc3a4 MS |
336 | } |
337 | ||
f6a1ed10 | 338 | return 0; |
1da177e4 LT |
339 | } |
340 | ||
341 | /* | |
570b9d96 | 342 | * This upgrades the mode on an already open dm_dev, being |
1da177e4 | 343 | * careful to leave things as they were if we fail to reopen the |
570b9d96 AK |
344 | * device and not to touch the existing bdev field in case |
345 | * it is accessed concurrently inside dm_table_any_congested(). | |
1da177e4 | 346 | */ |
aeb5d727 | 347 | static int upgrade_mode(struct dm_dev_internal *dd, fmode_t new_mode, |
82b1519b | 348 | struct mapped_device *md) |
1da177e4 LT |
349 | { |
350 | int r; | |
86f1152b | 351 | struct dm_dev *old_dev, *new_dev; |
1da177e4 | 352 | |
86f1152b | 353 | old_dev = dd->dm_dev; |
570b9d96 | 354 | |
86f1152b BM |
355 | r = dm_get_table_device(md, dd->dm_dev->bdev->bd_dev, |
356 | dd->dm_dev->mode | new_mode, &new_dev); | |
570b9d96 AK |
357 | if (r) |
358 | return r; | |
1da177e4 | 359 | |
86f1152b BM |
360 | dd->dm_dev = new_dev; |
361 | dm_put_table_device(md, old_dev); | |
1da177e4 | 362 | |
570b9d96 | 363 | return 0; |
1da177e4 LT |
364 | } |
365 | ||
366 | /* | |
367 | * Add a device to the list, or just increment the usage count if | |
368 | * it's already present. | |
369 | */ | |
08649012 MS |
370 | int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode, |
371 | struct dm_dev **result) | |
1da177e4 LT |
372 | { |
373 | int r; | |
69a2ce72 | 374 | dev_t uninitialized_var(dev); |
82b1519b | 375 | struct dm_dev_internal *dd; |
1da177e4 | 376 | unsigned int major, minor; |
08649012 | 377 | struct dm_table *t = ti->table; |
31998ef1 | 378 | char dummy; |
1da177e4 | 379 | |
547bc926 | 380 | BUG_ON(!t); |
1da177e4 | 381 | |
31998ef1 | 382 | if (sscanf(path, "%u:%u%c", &major, &minor, &dummy) == 2) { |
1da177e4 LT |
383 | /* Extract the major/minor numbers */ |
384 | dev = MKDEV(major, minor); | |
385 | if (MAJOR(dev) != major || MINOR(dev) != minor) | |
386 | return -EOVERFLOW; | |
387 | } else { | |
388 | /* convert the path to a device */ | |
72e8264e CH |
389 | struct block_device *bdev = lookup_bdev(path); |
390 | ||
391 | if (IS_ERR(bdev)) | |
392 | return PTR_ERR(bdev); | |
393 | dev = bdev->bd_dev; | |
394 | bdput(bdev); | |
1da177e4 LT |
395 | } |
396 | ||
397 | dd = find_device(&t->devices, dev); | |
398 | if (!dd) { | |
399 | dd = kmalloc(sizeof(*dd), GFP_KERNEL); | |
400 | if (!dd) | |
401 | return -ENOMEM; | |
402 | ||
86f1152b | 403 | if ((r = dm_get_table_device(t->md, dev, mode, &dd->dm_dev))) { |
1da177e4 LT |
404 | kfree(dd); |
405 | return r; | |
406 | } | |
407 | ||
1da177e4 LT |
408 | atomic_set(&dd->count, 0); |
409 | list_add(&dd->list, &t->devices); | |
410 | ||
86f1152b | 411 | } else if (dd->dm_dev->mode != (mode | dd->dm_dev->mode)) { |
f165921d | 412 | r = upgrade_mode(dd, mode, t->md); |
1da177e4 LT |
413 | if (r) |
414 | return r; | |
415 | } | |
416 | atomic_inc(&dd->count); | |
417 | ||
86f1152b | 418 | *result = dd->dm_dev; |
1da177e4 LT |
419 | return 0; |
420 | } | |
08649012 | 421 | EXPORT_SYMBOL(dm_get_device); |
1da177e4 | 422 | |
11f0431b MS |
423 | static int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev, |
424 | sector_t start, sector_t len, void *data) | |
1da177e4 | 425 | { |
754c5fc7 MS |
426 | struct queue_limits *limits = data; |
427 | struct block_device *bdev = dev->bdev; | |
165125e1 | 428 | struct request_queue *q = bdev_get_queue(bdev); |
0c2322e4 AK |
429 | char b[BDEVNAME_SIZE]; |
430 | ||
431 | if (unlikely(!q)) { | |
432 | DMWARN("%s: Cannot set limits for nonexistent device %s", | |
433 | dm_device_name(ti->table->md), bdevname(bdev, b)); | |
754c5fc7 | 434 | return 0; |
0c2322e4 | 435 | } |
3cb40214 | 436 | |
b27d7f16 MP |
437 | if (bdev_stack_limits(limits, bdev, start) < 0) |
438 | DMWARN("%s: adding target device %s caused an alignment inconsistency: " | |
a963a956 MS |
439 | "physical_block_size=%u, logical_block_size=%u, " |
440 | "alignment_offset=%u, start=%llu", | |
441 | dm_device_name(ti->table->md), bdevname(bdev, b), | |
442 | q->limits.physical_block_size, | |
443 | q->limits.logical_block_size, | |
444 | q->limits.alignment_offset, | |
b27d7f16 | 445 | (unsigned long long) start << SECTOR_SHIFT); |
3cb40214 | 446 | |
9980c638 MB |
447 | /* |
448 | * Check if merge fn is supported. | |
449 | * If not we'll force DM to use PAGE_SIZE or | |
450 | * smaller I/O, just to be safe. | |
3cb40214 | 451 | */ |
d5b9dd04 | 452 | if (dm_queue_merge_is_compulsory(q) && !ti->type->merge) |
72d4cd9f MS |
453 | blk_limits_max_hw_sectors(limits, |
454 | (unsigned int) (PAGE_SIZE >> 9)); | |
754c5fc7 | 455 | return 0; |
3cb40214 | 456 | } |
969429b5 | 457 | |
1da177e4 | 458 | /* |
08649012 | 459 | * Decrement a device's use count and remove it if necessary. |
1da177e4 | 460 | */ |
82b1519b | 461 | void dm_put_device(struct dm_target *ti, struct dm_dev *d) |
1da177e4 | 462 | { |
86f1152b BM |
463 | int found = 0; |
464 | struct list_head *devices = &ti->table->devices; | |
465 | struct dm_dev_internal *dd; | |
82b1519b | 466 | |
86f1152b BM |
467 | list_for_each_entry(dd, devices, list) { |
468 | if (dd->dm_dev == d) { | |
469 | found = 1; | |
470 | break; | |
471 | } | |
472 | } | |
473 | if (!found) { | |
474 | DMWARN("%s: device %s not in table devices list", | |
475 | dm_device_name(ti->table->md), d->name); | |
476 | return; | |
477 | } | |
1da177e4 | 478 | if (atomic_dec_and_test(&dd->count)) { |
86f1152b | 479 | dm_put_table_device(ti->table->md, d); |
1da177e4 LT |
480 | list_del(&dd->list); |
481 | kfree(dd); | |
482 | } | |
483 | } | |
08649012 | 484 | EXPORT_SYMBOL(dm_put_device); |
1da177e4 LT |
485 | |
486 | /* | |
487 | * Checks to see if the target joins onto the end of the table. | |
488 | */ | |
489 | static int adjoin(struct dm_table *table, struct dm_target *ti) | |
490 | { | |
491 | struct dm_target *prev; | |
492 | ||
493 | if (!table->num_targets) | |
494 | return !ti->begin; | |
495 | ||
496 | prev = &table->targets[table->num_targets - 1]; | |
497 | return (ti->begin == (prev->begin + prev->len)); | |
498 | } | |
499 | ||
500 | /* | |
501 | * Used to dynamically allocate the arg array. | |
f36afb39 MP |
502 | * |
503 | * We do first allocation with GFP_NOIO because dm-mpath and dm-thin must | |
504 | * process messages even if some device is suspended. These messages have a | |
505 | * small fixed number of arguments. | |
506 | * | |
507 | * On the other hand, dm-switch needs to process bulk data using messages and | |
508 | * excessive use of GFP_NOIO could cause trouble. | |
1da177e4 LT |
509 | */ |
510 | static char **realloc_argv(unsigned *array_size, char **old_argv) | |
511 | { | |
512 | char **argv; | |
513 | unsigned new_size; | |
f36afb39 | 514 | gfp_t gfp; |
1da177e4 | 515 | |
f36afb39 MP |
516 | if (*array_size) { |
517 | new_size = *array_size * 2; | |
518 | gfp = GFP_KERNEL; | |
519 | } else { | |
520 | new_size = 8; | |
521 | gfp = GFP_NOIO; | |
522 | } | |
523 | argv = kmalloc(new_size * sizeof(*argv), gfp); | |
1da177e4 LT |
524 | if (argv) { |
525 | memcpy(argv, old_argv, *array_size * sizeof(*argv)); | |
526 | *array_size = new_size; | |
527 | } | |
528 | ||
529 | kfree(old_argv); | |
530 | return argv; | |
531 | } | |
532 | ||
533 | /* | |
534 | * Destructively splits up the argument list to pass to ctr. | |
535 | */ | |
536 | int dm_split_args(int *argc, char ***argvp, char *input) | |
537 | { | |
538 | char *start, *end = input, *out, **argv = NULL; | |
539 | unsigned array_size = 0; | |
540 | ||
541 | *argc = 0; | |
814d6862 DT |
542 | |
543 | if (!input) { | |
544 | *argvp = NULL; | |
545 | return 0; | |
546 | } | |
547 | ||
1da177e4 LT |
548 | argv = realloc_argv(&array_size, argv); |
549 | if (!argv) | |
550 | return -ENOMEM; | |
551 | ||
552 | while (1) { | |
1da177e4 | 553 | /* Skip whitespace */ |
e7d2860b | 554 | start = skip_spaces(end); |
1da177e4 LT |
555 | |
556 | if (!*start) | |
557 | break; /* success, we hit the end */ | |
558 | ||
559 | /* 'out' is used to remove any back-quotes */ | |
560 | end = out = start; | |
561 | while (*end) { | |
562 | /* Everything apart from '\0' can be quoted */ | |
563 | if (*end == '\\' && *(end + 1)) { | |
564 | *out++ = *(end + 1); | |
565 | end += 2; | |
566 | continue; | |
567 | } | |
568 | ||
569 | if (isspace(*end)) | |
570 | break; /* end of token */ | |
571 | ||
572 | *out++ = *end++; | |
573 | } | |
574 | ||
575 | /* have we already filled the array ? */ | |
576 | if ((*argc + 1) > array_size) { | |
577 | argv = realloc_argv(&array_size, argv); | |
578 | if (!argv) | |
579 | return -ENOMEM; | |
580 | } | |
581 | ||
582 | /* we know this is whitespace */ | |
583 | if (*end) | |
584 | end++; | |
585 | ||
586 | /* terminate the string and put it in the array */ | |
587 | *out = '\0'; | |
588 | argv[*argc] = start; | |
589 | (*argc)++; | |
590 | } | |
591 | ||
592 | *argvp = argv; | |
593 | return 0; | |
594 | } | |
595 | ||
be6d4305 MS |
596 | /* |
597 | * Impose necessary and sufficient conditions on a devices's table such | |
598 | * that any incoming bio which respects its logical_block_size can be | |
599 | * processed successfully. If it falls across the boundary between | |
600 | * two or more targets, the size of each piece it gets split into must | |
601 | * be compatible with the logical_block_size of the target processing it. | |
602 | */ | |
754c5fc7 MS |
603 | static int validate_hardware_logical_block_alignment(struct dm_table *table, |
604 | struct queue_limits *limits) | |
be6d4305 MS |
605 | { |
606 | /* | |
607 | * This function uses arithmetic modulo the logical_block_size | |
608 | * (in units of 512-byte sectors). | |
609 | */ | |
610 | unsigned short device_logical_block_size_sects = | |
754c5fc7 | 611 | limits->logical_block_size >> SECTOR_SHIFT; |
be6d4305 MS |
612 | |
613 | /* | |
614 | * Offset of the start of the next table entry, mod logical_block_size. | |
615 | */ | |
616 | unsigned short next_target_start = 0; | |
617 | ||
618 | /* | |
619 | * Given an aligned bio that extends beyond the end of a | |
620 | * target, how many sectors must the next target handle? | |
621 | */ | |
622 | unsigned short remaining = 0; | |
623 | ||
624 | struct dm_target *uninitialized_var(ti); | |
754c5fc7 | 625 | struct queue_limits ti_limits; |
be6d4305 MS |
626 | unsigned i = 0; |
627 | ||
628 | /* | |
629 | * Check each entry in the table in turn. | |
630 | */ | |
631 | while (i < dm_table_get_num_targets(table)) { | |
632 | ti = dm_table_get_target(table, i++); | |
633 | ||
b1bd055d | 634 | blk_set_stacking_limits(&ti_limits); |
754c5fc7 MS |
635 | |
636 | /* combine all target devices' limits */ | |
637 | if (ti->type->iterate_devices) | |
638 | ti->type->iterate_devices(ti, dm_set_device_limits, | |
639 | &ti_limits); | |
640 | ||
be6d4305 MS |
641 | /* |
642 | * If the remaining sectors fall entirely within this | |
643 | * table entry are they compatible with its logical_block_size? | |
644 | */ | |
645 | if (remaining < ti->len && | |
754c5fc7 | 646 | remaining & ((ti_limits.logical_block_size >> |
be6d4305 MS |
647 | SECTOR_SHIFT) - 1)) |
648 | break; /* Error */ | |
649 | ||
650 | next_target_start = | |
651 | (unsigned short) ((next_target_start + ti->len) & | |
652 | (device_logical_block_size_sects - 1)); | |
653 | remaining = next_target_start ? | |
654 | device_logical_block_size_sects - next_target_start : 0; | |
655 | } | |
656 | ||
657 | if (remaining) { | |
658 | DMWARN("%s: table line %u (start sect %llu len %llu) " | |
a963a956 | 659 | "not aligned to h/w logical block size %u", |
be6d4305 MS |
660 | dm_device_name(table->md), i, |
661 | (unsigned long long) ti->begin, | |
662 | (unsigned long long) ti->len, | |
754c5fc7 | 663 | limits->logical_block_size); |
be6d4305 MS |
664 | return -EINVAL; |
665 | } | |
666 | ||
667 | return 0; | |
668 | } | |
669 | ||
1da177e4 LT |
670 | int dm_table_add_target(struct dm_table *t, const char *type, |
671 | sector_t start, sector_t len, char *params) | |
672 | { | |
673 | int r = -EINVAL, argc; | |
674 | char **argv; | |
675 | struct dm_target *tgt; | |
676 | ||
3791e2fc AK |
677 | if (t->singleton) { |
678 | DMERR("%s: target type %s must appear alone in table", | |
679 | dm_device_name(t->md), t->targets->type->name); | |
680 | return -EINVAL; | |
681 | } | |
682 | ||
57a2f238 | 683 | BUG_ON(t->num_targets >= t->num_allocated); |
1da177e4 LT |
684 | |
685 | tgt = t->targets + t->num_targets; | |
686 | memset(tgt, 0, sizeof(*tgt)); | |
687 | ||
688 | if (!len) { | |
72d94861 | 689 | DMERR("%s: zero-length target", dm_device_name(t->md)); |
1da177e4 LT |
690 | return -EINVAL; |
691 | } | |
692 | ||
693 | tgt->type = dm_get_target_type(type); | |
694 | if (!tgt->type) { | |
72d94861 AK |
695 | DMERR("%s: %s: unknown target type", dm_device_name(t->md), |
696 | type); | |
1da177e4 LT |
697 | return -EINVAL; |
698 | } | |
699 | ||
3791e2fc AK |
700 | if (dm_target_needs_singleton(tgt->type)) { |
701 | if (t->num_targets) { | |
702 | DMERR("%s: target type %s must appear alone in table", | |
703 | dm_device_name(t->md), type); | |
704 | return -EINVAL; | |
705 | } | |
706 | t->singleton = 1; | |
707 | } | |
708 | ||
cc6cbe14 AK |
709 | if (dm_target_always_writeable(tgt->type) && !(t->mode & FMODE_WRITE)) { |
710 | DMERR("%s: target type %s may not be included in read-only tables", | |
711 | dm_device_name(t->md), type); | |
712 | return -EINVAL; | |
713 | } | |
714 | ||
36a0456f AK |
715 | if (t->immutable_target_type) { |
716 | if (t->immutable_target_type != tgt->type) { | |
717 | DMERR("%s: immutable target type %s cannot be mixed with other target types", | |
718 | dm_device_name(t->md), t->immutable_target_type->name); | |
719 | return -EINVAL; | |
720 | } | |
721 | } else if (dm_target_is_immutable(tgt->type)) { | |
722 | if (t->num_targets) { | |
723 | DMERR("%s: immutable target type %s cannot be mixed with other target types", | |
724 | dm_device_name(t->md), tgt->type->name); | |
725 | return -EINVAL; | |
726 | } | |
727 | t->immutable_target_type = tgt->type; | |
728 | } | |
729 | ||
1da177e4 LT |
730 | tgt->table = t; |
731 | tgt->begin = start; | |
732 | tgt->len = len; | |
733 | tgt->error = "Unknown error"; | |
734 | ||
735 | /* | |
736 | * Does this target adjoin the previous one ? | |
737 | */ | |
738 | if (!adjoin(t, tgt)) { | |
739 | tgt->error = "Gap in table"; | |
740 | r = -EINVAL; | |
741 | goto bad; | |
742 | } | |
743 | ||
744 | r = dm_split_args(&argc, &argv, params); | |
745 | if (r) { | |
746 | tgt->error = "couldn't split parameters (insufficient memory)"; | |
747 | goto bad; | |
748 | } | |
749 | ||
750 | r = tgt->type->ctr(tgt, argc, argv); | |
751 | kfree(argv); | |
752 | if (r) | |
753 | goto bad; | |
754 | ||
755 | t->highs[t->num_targets++] = tgt->begin + tgt->len - 1; | |
756 | ||
55a62eef AK |
757 | if (!tgt->num_discard_bios && tgt->discards_supported) |
758 | DMWARN("%s: %s: ignoring discards_supported because num_discard_bios is zero.", | |
936688d7 | 759 | dm_device_name(t->md), type); |
5ae89a87 | 760 | |
1da177e4 LT |
761 | return 0; |
762 | ||
763 | bad: | |
72d94861 | 764 | DMERR("%s: %s: %s", dm_device_name(t->md), type, tgt->error); |
1da177e4 LT |
765 | dm_put_target_type(tgt->type); |
766 | return r; | |
767 | } | |
768 | ||
498f0103 MS |
769 | /* |
770 | * Target argument parsing helpers. | |
771 | */ | |
772 | static int validate_next_arg(struct dm_arg *arg, struct dm_arg_set *arg_set, | |
773 | unsigned *value, char **error, unsigned grouped) | |
774 | { | |
775 | const char *arg_str = dm_shift_arg(arg_set); | |
31998ef1 | 776 | char dummy; |
498f0103 MS |
777 | |
778 | if (!arg_str || | |
31998ef1 | 779 | (sscanf(arg_str, "%u%c", value, &dummy) != 1) || |
498f0103 MS |
780 | (*value < arg->min) || |
781 | (*value > arg->max) || | |
782 | (grouped && arg_set->argc < *value)) { | |
783 | *error = arg->error; | |
784 | return -EINVAL; | |
785 | } | |
786 | ||
787 | return 0; | |
788 | } | |
789 | ||
790 | int dm_read_arg(struct dm_arg *arg, struct dm_arg_set *arg_set, | |
791 | unsigned *value, char **error) | |
792 | { | |
793 | return validate_next_arg(arg, arg_set, value, error, 0); | |
794 | } | |
795 | EXPORT_SYMBOL(dm_read_arg); | |
796 | ||
797 | int dm_read_arg_group(struct dm_arg *arg, struct dm_arg_set *arg_set, | |
798 | unsigned *value, char **error) | |
799 | { | |
800 | return validate_next_arg(arg, arg_set, value, error, 1); | |
801 | } | |
802 | EXPORT_SYMBOL(dm_read_arg_group); | |
803 | ||
804 | const char *dm_shift_arg(struct dm_arg_set *as) | |
805 | { | |
806 | char *r; | |
807 | ||
808 | if (as->argc) { | |
809 | as->argc--; | |
810 | r = *as->argv; | |
811 | as->argv++; | |
812 | return r; | |
813 | } | |
814 | ||
815 | return NULL; | |
816 | } | |
817 | EXPORT_SYMBOL(dm_shift_arg); | |
818 | ||
819 | void dm_consume_args(struct dm_arg_set *as, unsigned num_args) | |
820 | { | |
821 | BUG_ON(as->argc < num_args); | |
822 | as->argc -= num_args; | |
823 | as->argv += num_args; | |
824 | } | |
825 | EXPORT_SYMBOL(dm_consume_args); | |
826 | ||
26803b9f | 827 | static int dm_table_set_type(struct dm_table *t) |
e6ee8c0b KU |
828 | { |
829 | unsigned i; | |
169e2cc2 | 830 | unsigned bio_based = 0, request_based = 0, hybrid = 0; |
e5863d9a | 831 | bool use_blk_mq = false; |
e6ee8c0b KU |
832 | struct dm_target *tgt; |
833 | struct dm_dev_internal *dd; | |
834 | struct list_head *devices; | |
65803c20 | 835 | unsigned live_md_type = dm_get_md_type(t->md); |
e6ee8c0b KU |
836 | |
837 | for (i = 0; i < t->num_targets; i++) { | |
838 | tgt = t->targets + i; | |
169e2cc2 MS |
839 | if (dm_target_hybrid(tgt)) |
840 | hybrid = 1; | |
841 | else if (dm_target_request_based(tgt)) | |
e6ee8c0b KU |
842 | request_based = 1; |
843 | else | |
844 | bio_based = 1; | |
845 | ||
846 | if (bio_based && request_based) { | |
847 | DMWARN("Inconsistent table: different target types" | |
848 | " can't be mixed up"); | |
849 | return -EINVAL; | |
850 | } | |
851 | } | |
852 | ||
169e2cc2 MS |
853 | if (hybrid && !bio_based && !request_based) { |
854 | /* | |
855 | * The targets can work either way. | |
856 | * Determine the type from the live device. | |
857 | * Default to bio-based if device is new. | |
858 | */ | |
65803c20 MS |
859 | if (live_md_type == DM_TYPE_REQUEST_BASED || |
860 | live_md_type == DM_TYPE_MQ_REQUEST_BASED) | |
169e2cc2 MS |
861 | request_based = 1; |
862 | else | |
863 | bio_based = 1; | |
864 | } | |
865 | ||
e6ee8c0b KU |
866 | if (bio_based) { |
867 | /* We must use this table as bio-based */ | |
868 | t->type = DM_TYPE_BIO_BASED; | |
869 | return 0; | |
870 | } | |
871 | ||
872 | BUG_ON(!request_based); /* No targets in this table */ | |
873 | ||
65803c20 MS |
874 | /* |
875 | * Request-based dm supports only tables that have a single target now. | |
876 | * To support multiple targets, request splitting support is needed, | |
877 | * and that needs lots of changes in the block-layer. | |
878 | * (e.g. request completion process for partial completion.) | |
879 | */ | |
880 | if (t->num_targets > 1) { | |
881 | DMWARN("Request-based dm doesn't support multiple targets yet"); | |
882 | return -EINVAL; | |
883 | } | |
884 | ||
e6ee8c0b KU |
885 | /* Non-request-stackable devices can't be used for request-based dm */ |
886 | devices = dm_table_get_devices(t); | |
887 | list_for_each_entry(dd, devices, list) { | |
e5863d9a MS |
888 | struct request_queue *q = bdev_get_queue(dd->dm_dev->bdev); |
889 | ||
890 | if (!blk_queue_stackable(q)) { | |
891 | DMERR("table load rejected: including" | |
892 | " non-request-stackable devices"); | |
e6ee8c0b KU |
893 | return -EINVAL; |
894 | } | |
e5863d9a MS |
895 | |
896 | if (q->mq_ops) | |
897 | use_blk_mq = true; | |
898 | } | |
899 | ||
900 | if (use_blk_mq) { | |
901 | /* verify _all_ devices in the table are blk-mq devices */ | |
902 | list_for_each_entry(dd, devices, list) | |
903 | if (!bdev_get_queue(dd->dm_dev->bdev)->mq_ops) { | |
904 | DMERR("table load rejected: not all devices" | |
905 | " are blk-mq request-stackable"); | |
906 | return -EINVAL; | |
907 | } | |
65803c20 | 908 | t->type = DM_TYPE_MQ_REQUEST_BASED; |
e6ee8c0b | 909 | |
65803c20 MS |
910 | } else if (hybrid && list_empty(devices) && live_md_type != DM_TYPE_NONE) { |
911 | /* inherit live MD type */ | |
912 | t->type = live_md_type; | |
e6ee8c0b | 913 | |
65803c20 MS |
914 | } else |
915 | t->type = DM_TYPE_REQUEST_BASED; | |
e6ee8c0b KU |
916 | |
917 | return 0; | |
918 | } | |
919 | ||
920 | unsigned dm_table_get_type(struct dm_table *t) | |
921 | { | |
922 | return t->type; | |
923 | } | |
924 | ||
36a0456f AK |
925 | struct target_type *dm_table_get_immutable_target_type(struct dm_table *t) |
926 | { | |
927 | return t->immutable_target_type; | |
928 | } | |
929 | ||
e6ee8c0b KU |
930 | bool dm_table_request_based(struct dm_table *t) |
931 | { | |
e5863d9a MS |
932 | unsigned table_type = dm_table_get_type(t); |
933 | ||
934 | return (table_type == DM_TYPE_REQUEST_BASED || | |
935 | table_type == DM_TYPE_MQ_REQUEST_BASED); | |
936 | } | |
937 | ||
938 | bool dm_table_mq_request_based(struct dm_table *t) | |
939 | { | |
940 | return dm_table_get_type(t) == DM_TYPE_MQ_REQUEST_BASED; | |
e6ee8c0b KU |
941 | } |
942 | ||
473c36df | 943 | static int dm_table_alloc_md_mempools(struct dm_table *t) |
e6ee8c0b KU |
944 | { |
945 | unsigned type = dm_table_get_type(t); | |
c0820cf5 MP |
946 | unsigned per_bio_data_size = 0; |
947 | struct dm_target *tgt; | |
948 | unsigned i; | |
e6ee8c0b KU |
949 | |
950 | if (unlikely(type == DM_TYPE_NONE)) { | |
951 | DMWARN("no table type is set, can't allocate mempools"); | |
952 | return -EINVAL; | |
953 | } | |
954 | ||
c0820cf5 MP |
955 | if (type == DM_TYPE_BIO_BASED) |
956 | for (i = 0; i < t->num_targets; i++) { | |
957 | tgt = t->targets + i; | |
958 | per_bio_data_size = max(per_bio_data_size, tgt->per_bio_data_size); | |
959 | } | |
960 | ||
961 | t->mempools = dm_alloc_md_mempools(type, t->integrity_supported, per_bio_data_size); | |
e6ee8c0b KU |
962 | if (!t->mempools) |
963 | return -ENOMEM; | |
964 | ||
965 | return 0; | |
966 | } | |
967 | ||
968 | void dm_table_free_md_mempools(struct dm_table *t) | |
969 | { | |
970 | dm_free_md_mempools(t->mempools); | |
971 | t->mempools = NULL; | |
972 | } | |
973 | ||
974 | struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t) | |
975 | { | |
976 | return t->mempools; | |
977 | } | |
978 | ||
1da177e4 LT |
979 | static int setup_indexes(struct dm_table *t) |
980 | { | |
981 | int i; | |
982 | unsigned int total = 0; | |
983 | sector_t *indexes; | |
984 | ||
985 | /* allocate the space for *all* the indexes */ | |
986 | for (i = t->depth - 2; i >= 0; i--) { | |
987 | t->counts[i] = dm_div_up(t->counts[i + 1], CHILDREN_PER_NODE); | |
988 | total += t->counts[i]; | |
989 | } | |
990 | ||
991 | indexes = (sector_t *) dm_vcalloc(total, (unsigned long) NODE_SIZE); | |
992 | if (!indexes) | |
993 | return -ENOMEM; | |
994 | ||
995 | /* set up internal nodes, bottom-up */ | |
82d601dc | 996 | for (i = t->depth - 2; i >= 0; i--) { |
1da177e4 LT |
997 | t->index[i] = indexes; |
998 | indexes += (KEYS_PER_NODE * t->counts[i]); | |
999 | setup_btree_index(i, t); | |
1000 | } | |
1001 | ||
1002 | return 0; | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * Builds the btree to index the map. | |
1007 | */ | |
26803b9f | 1008 | static int dm_table_build_index(struct dm_table *t) |
1da177e4 LT |
1009 | { |
1010 | int r = 0; | |
1011 | unsigned int leaf_nodes; | |
1012 | ||
1da177e4 LT |
1013 | /* how many indexes will the btree have ? */ |
1014 | leaf_nodes = dm_div_up(t->num_targets, KEYS_PER_NODE); | |
1015 | t->depth = 1 + int_log(leaf_nodes, CHILDREN_PER_NODE); | |
1016 | ||
1017 | /* leaf layer has already been set up */ | |
1018 | t->counts[t->depth - 1] = leaf_nodes; | |
1019 | t->index[t->depth - 1] = t->highs; | |
1020 | ||
1021 | if (t->depth >= 2) | |
1022 | r = setup_indexes(t); | |
1023 | ||
1024 | return r; | |
1025 | } | |
1026 | ||
a63a5cf8 MS |
1027 | /* |
1028 | * Get a disk whose integrity profile reflects the table's profile. | |
1029 | * If %match_all is true, all devices' profiles must match. | |
1030 | * If %match_all is false, all devices must at least have an | |
1031 | * allocated integrity profile; but uninitialized is ok. | |
1032 | * Returns NULL if integrity support was inconsistent or unavailable. | |
1033 | */ | |
1034 | static struct gendisk * dm_table_get_integrity_disk(struct dm_table *t, | |
1035 | bool match_all) | |
1036 | { | |
1037 | struct list_head *devices = dm_table_get_devices(t); | |
1038 | struct dm_dev_internal *dd = NULL; | |
1039 | struct gendisk *prev_disk = NULL, *template_disk = NULL; | |
1040 | ||
1041 | list_for_each_entry(dd, devices, list) { | |
86f1152b | 1042 | template_disk = dd->dm_dev->bdev->bd_disk; |
a63a5cf8 MS |
1043 | if (!blk_get_integrity(template_disk)) |
1044 | goto no_integrity; | |
1045 | if (!match_all && !blk_integrity_is_initialized(template_disk)) | |
1046 | continue; /* skip uninitialized profiles */ | |
1047 | else if (prev_disk && | |
1048 | blk_integrity_compare(prev_disk, template_disk) < 0) | |
1049 | goto no_integrity; | |
1050 | prev_disk = template_disk; | |
1051 | } | |
1052 | ||
1053 | return template_disk; | |
1054 | ||
1055 | no_integrity: | |
1056 | if (prev_disk) | |
1057 | DMWARN("%s: integrity not set: %s and %s profile mismatch", | |
1058 | dm_device_name(t->md), | |
1059 | prev_disk->disk_name, | |
1060 | template_disk->disk_name); | |
1061 | return NULL; | |
1062 | } | |
1063 | ||
26803b9f WD |
1064 | /* |
1065 | * Register the mapped device for blk_integrity support if | |
a63a5cf8 MS |
1066 | * the underlying devices have an integrity profile. But all devices |
1067 | * may not have matching profiles (checking all devices isn't reliable | |
1068 | * during table load because this table may use other DM device(s) which | |
1069 | * must be resumed before they will have an initialized integity profile). | |
1070 | * Stacked DM devices force a 2 stage integrity profile validation: | |
1071 | * 1 - during load, validate all initialized integrity profiles match | |
1072 | * 2 - during resume, validate all integrity profiles match | |
26803b9f WD |
1073 | */ |
1074 | static int dm_table_prealloc_integrity(struct dm_table *t, struct mapped_device *md) | |
1075 | { | |
a63a5cf8 | 1076 | struct gendisk *template_disk = NULL; |
26803b9f | 1077 | |
a63a5cf8 MS |
1078 | template_disk = dm_table_get_integrity_disk(t, false); |
1079 | if (!template_disk) | |
1080 | return 0; | |
26803b9f | 1081 | |
a63a5cf8 MS |
1082 | if (!blk_integrity_is_initialized(dm_disk(md))) { |
1083 | t->integrity_supported = 1; | |
1084 | return blk_integrity_register(dm_disk(md), NULL); | |
1085 | } | |
1086 | ||
1087 | /* | |
1088 | * If DM device already has an initalized integrity | |
1089 | * profile the new profile should not conflict. | |
1090 | */ | |
1091 | if (blk_integrity_is_initialized(template_disk) && | |
1092 | blk_integrity_compare(dm_disk(md), template_disk) < 0) { | |
1093 | DMWARN("%s: conflict with existing integrity profile: " | |
1094 | "%s profile mismatch", | |
1095 | dm_device_name(t->md), | |
1096 | template_disk->disk_name); | |
1097 | return 1; | |
1098 | } | |
1099 | ||
1100 | /* Preserve existing initialized integrity profile */ | |
1101 | t->integrity_supported = 1; | |
26803b9f WD |
1102 | return 0; |
1103 | } | |
1104 | ||
1105 | /* | |
1106 | * Prepares the table for use by building the indices, | |
1107 | * setting the type, and allocating mempools. | |
1108 | */ | |
1109 | int dm_table_complete(struct dm_table *t) | |
1110 | { | |
1111 | int r; | |
1112 | ||
1113 | r = dm_table_set_type(t); | |
1114 | if (r) { | |
1115 | DMERR("unable to set table type"); | |
1116 | return r; | |
1117 | } | |
1118 | ||
1119 | r = dm_table_build_index(t); | |
1120 | if (r) { | |
1121 | DMERR("unable to build btrees"); | |
1122 | return r; | |
1123 | } | |
1124 | ||
1125 | r = dm_table_prealloc_integrity(t, t->md); | |
1126 | if (r) { | |
1127 | DMERR("could not register integrity profile."); | |
1128 | return r; | |
1129 | } | |
1130 | ||
1131 | r = dm_table_alloc_md_mempools(t); | |
1132 | if (r) | |
1133 | DMERR("unable to allocate mempools"); | |
1134 | ||
1135 | return r; | |
1136 | } | |
1137 | ||
48c9c27b | 1138 | static DEFINE_MUTEX(_event_lock); |
1da177e4 LT |
1139 | void dm_table_event_callback(struct dm_table *t, |
1140 | void (*fn)(void *), void *context) | |
1141 | { | |
48c9c27b | 1142 | mutex_lock(&_event_lock); |
1da177e4 LT |
1143 | t->event_fn = fn; |
1144 | t->event_context = context; | |
48c9c27b | 1145 | mutex_unlock(&_event_lock); |
1da177e4 LT |
1146 | } |
1147 | ||
1148 | void dm_table_event(struct dm_table *t) | |
1149 | { | |
1150 | /* | |
1151 | * You can no longer call dm_table_event() from interrupt | |
1152 | * context, use a bottom half instead. | |
1153 | */ | |
1154 | BUG_ON(in_interrupt()); | |
1155 | ||
48c9c27b | 1156 | mutex_lock(&_event_lock); |
1da177e4 LT |
1157 | if (t->event_fn) |
1158 | t->event_fn(t->event_context); | |
48c9c27b | 1159 | mutex_unlock(&_event_lock); |
1da177e4 | 1160 | } |
08649012 | 1161 | EXPORT_SYMBOL(dm_table_event); |
1da177e4 LT |
1162 | |
1163 | sector_t dm_table_get_size(struct dm_table *t) | |
1164 | { | |
1165 | return t->num_targets ? (t->highs[t->num_targets - 1] + 1) : 0; | |
1166 | } | |
08649012 | 1167 | EXPORT_SYMBOL(dm_table_get_size); |
1da177e4 LT |
1168 | |
1169 | struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index) | |
1170 | { | |
14353539 | 1171 | if (index >= t->num_targets) |
1da177e4 LT |
1172 | return NULL; |
1173 | ||
1174 | return t->targets + index; | |
1175 | } | |
1176 | ||
1177 | /* | |
1178 | * Search the btree for the correct target. | |
512875bd JN |
1179 | * |
1180 | * Caller should check returned pointer with dm_target_is_valid() | |
1181 | * to trap I/O beyond end of device. | |
1da177e4 LT |
1182 | */ |
1183 | struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector) | |
1184 | { | |
1185 | unsigned int l, n = 0, k = 0; | |
1186 | sector_t *node; | |
1187 | ||
1188 | for (l = 0; l < t->depth; l++) { | |
1189 | n = get_child(n, k); | |
1190 | node = get_node(t, l, n); | |
1191 | ||
1192 | for (k = 0; k < KEYS_PER_NODE; k++) | |
1193 | if (node[k] >= sector) | |
1194 | break; | |
1195 | } | |
1196 | ||
1197 | return &t->targets[(KEYS_PER_NODE * n) + k]; | |
1198 | } | |
1199 | ||
3ae70656 MS |
1200 | static int count_device(struct dm_target *ti, struct dm_dev *dev, |
1201 | sector_t start, sector_t len, void *data) | |
1202 | { | |
1203 | unsigned *num_devices = data; | |
1204 | ||
1205 | (*num_devices)++; | |
1206 | ||
1207 | return 0; | |
1208 | } | |
1209 | ||
1210 | /* | |
1211 | * Check whether a table has no data devices attached using each | |
1212 | * target's iterate_devices method. | |
1213 | * Returns false if the result is unknown because a target doesn't | |
1214 | * support iterate_devices. | |
1215 | */ | |
1216 | bool dm_table_has_no_data_devices(struct dm_table *table) | |
1217 | { | |
1218 | struct dm_target *uninitialized_var(ti); | |
1219 | unsigned i = 0, num_devices = 0; | |
1220 | ||
1221 | while (i < dm_table_get_num_targets(table)) { | |
1222 | ti = dm_table_get_target(table, i++); | |
1223 | ||
1224 | if (!ti->type->iterate_devices) | |
1225 | return false; | |
1226 | ||
1227 | ti->type->iterate_devices(ti, count_device, &num_devices); | |
1228 | if (num_devices) | |
1229 | return false; | |
1230 | } | |
1231 | ||
1232 | return true; | |
1233 | } | |
1234 | ||
754c5fc7 MS |
1235 | /* |
1236 | * Establish the new table's queue_limits and validate them. | |
1237 | */ | |
1238 | int dm_calculate_queue_limits(struct dm_table *table, | |
1239 | struct queue_limits *limits) | |
1240 | { | |
1241 | struct dm_target *uninitialized_var(ti); | |
1242 | struct queue_limits ti_limits; | |
1243 | unsigned i = 0; | |
1244 | ||
b1bd055d | 1245 | blk_set_stacking_limits(limits); |
754c5fc7 MS |
1246 | |
1247 | while (i < dm_table_get_num_targets(table)) { | |
b1bd055d | 1248 | blk_set_stacking_limits(&ti_limits); |
754c5fc7 MS |
1249 | |
1250 | ti = dm_table_get_target(table, i++); | |
1251 | ||
1252 | if (!ti->type->iterate_devices) | |
1253 | goto combine_limits; | |
1254 | ||
1255 | /* | |
1256 | * Combine queue limits of all the devices this target uses. | |
1257 | */ | |
1258 | ti->type->iterate_devices(ti, dm_set_device_limits, | |
1259 | &ti_limits); | |
1260 | ||
40bea431 MS |
1261 | /* Set I/O hints portion of queue limits */ |
1262 | if (ti->type->io_hints) | |
1263 | ti->type->io_hints(ti, &ti_limits); | |
1264 | ||
754c5fc7 MS |
1265 | /* |
1266 | * Check each device area is consistent with the target's | |
1267 | * overall queue limits. | |
1268 | */ | |
f6a1ed10 MP |
1269 | if (ti->type->iterate_devices(ti, device_area_is_invalid, |
1270 | &ti_limits)) | |
754c5fc7 MS |
1271 | return -EINVAL; |
1272 | ||
1273 | combine_limits: | |
1274 | /* | |
1275 | * Merge this target's queue limits into the overall limits | |
1276 | * for the table. | |
1277 | */ | |
1278 | if (blk_stack_limits(limits, &ti_limits, 0) < 0) | |
b27d7f16 | 1279 | DMWARN("%s: adding target device " |
754c5fc7 | 1280 | "(start sect %llu len %llu) " |
b27d7f16 | 1281 | "caused an alignment inconsistency", |
754c5fc7 MS |
1282 | dm_device_name(table->md), |
1283 | (unsigned long long) ti->begin, | |
1284 | (unsigned long long) ti->len); | |
1285 | } | |
1286 | ||
1287 | return validate_hardware_logical_block_alignment(table, limits); | |
1288 | } | |
1289 | ||
9c47008d MP |
1290 | /* |
1291 | * Set the integrity profile for this device if all devices used have | |
a63a5cf8 MS |
1292 | * matching profiles. We're quite deep in the resume path but still |
1293 | * don't know if all devices (particularly DM devices this device | |
1294 | * may be stacked on) have matching profiles. Even if the profiles | |
1295 | * don't match we have no way to fail (to resume) at this point. | |
9c47008d MP |
1296 | */ |
1297 | static void dm_table_set_integrity(struct dm_table *t) | |
1298 | { | |
a63a5cf8 | 1299 | struct gendisk *template_disk = NULL; |
9c47008d MP |
1300 | |
1301 | if (!blk_get_integrity(dm_disk(t->md))) | |
1302 | return; | |
1303 | ||
a63a5cf8 | 1304 | template_disk = dm_table_get_integrity_disk(t, true); |
876fbba1 MS |
1305 | if (template_disk) |
1306 | blk_integrity_register(dm_disk(t->md), | |
1307 | blk_get_integrity(template_disk)); | |
1308 | else if (blk_integrity_is_initialized(dm_disk(t->md))) | |
a63a5cf8 MS |
1309 | DMWARN("%s: device no longer has a valid integrity profile", |
1310 | dm_device_name(t->md)); | |
876fbba1 MS |
1311 | else |
1312 | DMWARN("%s: unable to establish an integrity profile", | |
1313 | dm_device_name(t->md)); | |
9c47008d MP |
1314 | } |
1315 | ||
ed8b752b MS |
1316 | static int device_flush_capable(struct dm_target *ti, struct dm_dev *dev, |
1317 | sector_t start, sector_t len, void *data) | |
1318 | { | |
1319 | unsigned flush = (*(unsigned *)data); | |
1320 | struct request_queue *q = bdev_get_queue(dev->bdev); | |
1321 | ||
1322 | return q && (q->flush_flags & flush); | |
1323 | } | |
1324 | ||
1325 | static bool dm_table_supports_flush(struct dm_table *t, unsigned flush) | |
1326 | { | |
1327 | struct dm_target *ti; | |
1328 | unsigned i = 0; | |
1329 | ||
1330 | /* | |
1331 | * Require at least one underlying device to support flushes. | |
1332 | * t->devices includes internal dm devices such as mirror logs | |
1333 | * so we need to use iterate_devices here, which targets | |
1334 | * supporting flushes must provide. | |
1335 | */ | |
1336 | while (i < dm_table_get_num_targets(t)) { | |
1337 | ti = dm_table_get_target(t, i++); | |
1338 | ||
55a62eef | 1339 | if (!ti->num_flush_bios) |
ed8b752b MS |
1340 | continue; |
1341 | ||
0e9c24ed JT |
1342 | if (ti->flush_supported) |
1343 | return 1; | |
1344 | ||
ed8b752b MS |
1345 | if (ti->type->iterate_devices && |
1346 | ti->type->iterate_devices(ti, device_flush_capable, &flush)) | |
1347 | return 1; | |
1348 | } | |
1349 | ||
1350 | return 0; | |
1351 | } | |
1352 | ||
983c7db3 MB |
1353 | static bool dm_table_discard_zeroes_data(struct dm_table *t) |
1354 | { | |
1355 | struct dm_target *ti; | |
1356 | unsigned i = 0; | |
1357 | ||
1358 | /* Ensure that all targets supports discard_zeroes_data. */ | |
1359 | while (i < dm_table_get_num_targets(t)) { | |
1360 | ti = dm_table_get_target(t, i++); | |
1361 | ||
1362 | if (ti->discard_zeroes_data_unsupported) | |
1363 | return 0; | |
1364 | } | |
1365 | ||
1366 | return 1; | |
1367 | } | |
1368 | ||
4693c966 MSB |
1369 | static int device_is_nonrot(struct dm_target *ti, struct dm_dev *dev, |
1370 | sector_t start, sector_t len, void *data) | |
1371 | { | |
1372 | struct request_queue *q = bdev_get_queue(dev->bdev); | |
1373 | ||
1374 | return q && blk_queue_nonrot(q); | |
1375 | } | |
1376 | ||
c3c4555e MB |
1377 | static int device_is_not_random(struct dm_target *ti, struct dm_dev *dev, |
1378 | sector_t start, sector_t len, void *data) | |
1379 | { | |
1380 | struct request_queue *q = bdev_get_queue(dev->bdev); | |
1381 | ||
1382 | return q && !blk_queue_add_random(q); | |
1383 | } | |
1384 | ||
200612ec JM |
1385 | static int queue_supports_sg_merge(struct dm_target *ti, struct dm_dev *dev, |
1386 | sector_t start, sector_t len, void *data) | |
1387 | { | |
1388 | struct request_queue *q = bdev_get_queue(dev->bdev); | |
1389 | ||
1390 | return q && !test_bit(QUEUE_FLAG_NO_SG_MERGE, &q->queue_flags); | |
1391 | } | |
1392 | ||
a4afe76b KB |
1393 | static int queue_supports_sg_gaps(struct dm_target *ti, struct dm_dev *dev, |
1394 | sector_t start, sector_t len, void *data) | |
1395 | { | |
1396 | struct request_queue *q = bdev_get_queue(dev->bdev); | |
1397 | ||
1398 | return q && !test_bit(QUEUE_FLAG_SG_GAPS, &q->queue_flags); | |
1399 | } | |
1400 | ||
c3c4555e MB |
1401 | static bool dm_table_all_devices_attribute(struct dm_table *t, |
1402 | iterate_devices_callout_fn func) | |
4693c966 MSB |
1403 | { |
1404 | struct dm_target *ti; | |
1405 | unsigned i = 0; | |
1406 | ||
4693c966 MSB |
1407 | while (i < dm_table_get_num_targets(t)) { |
1408 | ti = dm_table_get_target(t, i++); | |
1409 | ||
1410 | if (!ti->type->iterate_devices || | |
c3c4555e | 1411 | !ti->type->iterate_devices(ti, func, NULL)) |
4693c966 MSB |
1412 | return 0; |
1413 | } | |
1414 | ||
1415 | return 1; | |
1416 | } | |
1417 | ||
d54eaa5a MS |
1418 | static int device_not_write_same_capable(struct dm_target *ti, struct dm_dev *dev, |
1419 | sector_t start, sector_t len, void *data) | |
1420 | { | |
1421 | struct request_queue *q = bdev_get_queue(dev->bdev); | |
1422 | ||
1423 | return q && !q->limits.max_write_same_sectors; | |
1424 | } | |
1425 | ||
1426 | static bool dm_table_supports_write_same(struct dm_table *t) | |
1427 | { | |
1428 | struct dm_target *ti; | |
1429 | unsigned i = 0; | |
1430 | ||
1431 | while (i < dm_table_get_num_targets(t)) { | |
1432 | ti = dm_table_get_target(t, i++); | |
1433 | ||
55a62eef | 1434 | if (!ti->num_write_same_bios) |
d54eaa5a MS |
1435 | return false; |
1436 | ||
1437 | if (!ti->type->iterate_devices || | |
dc019b21 | 1438 | ti->type->iterate_devices(ti, device_not_write_same_capable, NULL)) |
d54eaa5a MS |
1439 | return false; |
1440 | } | |
1441 | ||
1442 | return true; | |
1443 | } | |
1444 | ||
a7ffb6a5 MP |
1445 | static int device_discard_capable(struct dm_target *ti, struct dm_dev *dev, |
1446 | sector_t start, sector_t len, void *data) | |
1447 | { | |
1448 | struct request_queue *q = bdev_get_queue(dev->bdev); | |
1449 | ||
1450 | return q && blk_queue_discard(q); | |
1451 | } | |
1452 | ||
1453 | static bool dm_table_supports_discards(struct dm_table *t) | |
1454 | { | |
1455 | struct dm_target *ti; | |
1456 | unsigned i = 0; | |
1457 | ||
1458 | /* | |
1459 | * Unless any target used by the table set discards_supported, | |
1460 | * require at least one underlying device to support discards. | |
1461 | * t->devices includes internal dm devices such as mirror logs | |
1462 | * so we need to use iterate_devices here, which targets | |
1463 | * supporting discard selectively must provide. | |
1464 | */ | |
1465 | while (i < dm_table_get_num_targets(t)) { | |
1466 | ti = dm_table_get_target(t, i++); | |
1467 | ||
1468 | if (!ti->num_discard_bios) | |
1469 | continue; | |
1470 | ||
1471 | if (ti->discards_supported) | |
1472 | return 1; | |
1473 | ||
1474 | if (ti->type->iterate_devices && | |
1475 | ti->type->iterate_devices(ti, device_discard_capable, NULL)) | |
1476 | return 1; | |
1477 | } | |
1478 | ||
1479 | return 0; | |
1480 | } | |
1481 | ||
754c5fc7 MS |
1482 | void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, |
1483 | struct queue_limits *limits) | |
1da177e4 | 1484 | { |
ed8b752b MS |
1485 | unsigned flush = 0; |
1486 | ||
1da177e4 | 1487 | /* |
1197764e | 1488 | * Copy table's limits to the DM device's request_queue |
1da177e4 | 1489 | */ |
754c5fc7 | 1490 | q->limits = *limits; |
c9a3f6d6 | 1491 | |
5ae89a87 MS |
1492 | if (!dm_table_supports_discards(t)) |
1493 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q); | |
1494 | else | |
1495 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); | |
1496 | ||
ed8b752b MS |
1497 | if (dm_table_supports_flush(t, REQ_FLUSH)) { |
1498 | flush |= REQ_FLUSH; | |
1499 | if (dm_table_supports_flush(t, REQ_FUA)) | |
1500 | flush |= REQ_FUA; | |
1501 | } | |
1502 | blk_queue_flush(q, flush); | |
1503 | ||
983c7db3 MB |
1504 | if (!dm_table_discard_zeroes_data(t)) |
1505 | q->limits.discard_zeroes_data = 0; | |
1506 | ||
c3c4555e MB |
1507 | /* Ensure that all underlying devices are non-rotational. */ |
1508 | if (dm_table_all_devices_attribute(t, device_is_nonrot)) | |
4693c966 MSB |
1509 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q); |
1510 | else | |
1511 | queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, q); | |
1512 | ||
d54eaa5a MS |
1513 | if (!dm_table_supports_write_same(t)) |
1514 | q->limits.max_write_same_sectors = 0; | |
c1a94672 | 1515 | |
200612ec JM |
1516 | if (dm_table_all_devices_attribute(t, queue_supports_sg_merge)) |
1517 | queue_flag_clear_unlocked(QUEUE_FLAG_NO_SG_MERGE, q); | |
1518 | else | |
1519 | queue_flag_set_unlocked(QUEUE_FLAG_NO_SG_MERGE, q); | |
1520 | ||
a4afe76b KB |
1521 | if (dm_table_all_devices_attribute(t, queue_supports_sg_gaps)) |
1522 | queue_flag_clear_unlocked(QUEUE_FLAG_SG_GAPS, q); | |
1523 | else | |
1524 | queue_flag_set_unlocked(QUEUE_FLAG_SG_GAPS, q); | |
1525 | ||
9c47008d | 1526 | dm_table_set_integrity(t); |
e6ee8c0b | 1527 | |
c3c4555e MB |
1528 | /* |
1529 | * Determine whether or not this queue's I/O timings contribute | |
1530 | * to the entropy pool, Only request-based targets use this. | |
1531 | * Clear QUEUE_FLAG_ADD_RANDOM if any underlying device does not | |
1532 | * have it set. | |
1533 | */ | |
1534 | if (blk_queue_add_random(q) && dm_table_all_devices_attribute(t, device_is_not_random)) | |
1535 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q); | |
1536 | ||
e6ee8c0b KU |
1537 | /* |
1538 | * QUEUE_FLAG_STACKABLE must be set after all queue settings are | |
1539 | * visible to other CPUs because, once the flag is set, incoming bios | |
1540 | * are processed by request-based dm, which refers to the queue | |
1541 | * settings. | |
1542 | * Until the flag set, bios are passed to bio-based dm and queued to | |
1543 | * md->deferred where queue settings are not needed yet. | |
1544 | * Those bios are passed to request-based dm at the resume time. | |
1545 | */ | |
1546 | smp_mb(); | |
1547 | if (dm_table_request_based(t)) | |
1548 | queue_flag_set_unlocked(QUEUE_FLAG_STACKABLE, q); | |
1da177e4 LT |
1549 | } |
1550 | ||
1551 | unsigned int dm_table_get_num_targets(struct dm_table *t) | |
1552 | { | |
1553 | return t->num_targets; | |
1554 | } | |
1555 | ||
1556 | struct list_head *dm_table_get_devices(struct dm_table *t) | |
1557 | { | |
1558 | return &t->devices; | |
1559 | } | |
1560 | ||
aeb5d727 | 1561 | fmode_t dm_table_get_mode(struct dm_table *t) |
1da177e4 LT |
1562 | { |
1563 | return t->mode; | |
1564 | } | |
08649012 | 1565 | EXPORT_SYMBOL(dm_table_get_mode); |
1da177e4 | 1566 | |
d67ee213 MS |
1567 | enum suspend_mode { |
1568 | PRESUSPEND, | |
1569 | PRESUSPEND_UNDO, | |
1570 | POSTSUSPEND, | |
1571 | }; | |
1572 | ||
1573 | static void suspend_targets(struct dm_table *t, enum suspend_mode mode) | |
1da177e4 LT |
1574 | { |
1575 | int i = t->num_targets; | |
1576 | struct dm_target *ti = t->targets; | |
1577 | ||
1578 | while (i--) { | |
d67ee213 MS |
1579 | switch (mode) { |
1580 | case PRESUSPEND: | |
1581 | if (ti->type->presuspend) | |
1582 | ti->type->presuspend(ti); | |
1583 | break; | |
1584 | case PRESUSPEND_UNDO: | |
1585 | if (ti->type->presuspend_undo) | |
1586 | ti->type->presuspend_undo(ti); | |
1587 | break; | |
1588 | case POSTSUSPEND: | |
1da177e4 LT |
1589 | if (ti->type->postsuspend) |
1590 | ti->type->postsuspend(ti); | |
d67ee213 MS |
1591 | break; |
1592 | } | |
1da177e4 LT |
1593 | ti++; |
1594 | } | |
1595 | } | |
1596 | ||
1597 | void dm_table_presuspend_targets(struct dm_table *t) | |
1598 | { | |
cf222b37 AK |
1599 | if (!t) |
1600 | return; | |
1601 | ||
d67ee213 MS |
1602 | suspend_targets(t, PRESUSPEND); |
1603 | } | |
1604 | ||
1605 | void dm_table_presuspend_undo_targets(struct dm_table *t) | |
1606 | { | |
1607 | if (!t) | |
1608 | return; | |
1609 | ||
1610 | suspend_targets(t, PRESUSPEND_UNDO); | |
1da177e4 LT |
1611 | } |
1612 | ||
1613 | void dm_table_postsuspend_targets(struct dm_table *t) | |
1614 | { | |
cf222b37 AK |
1615 | if (!t) |
1616 | return; | |
1617 | ||
d67ee213 | 1618 | suspend_targets(t, POSTSUSPEND); |
1da177e4 LT |
1619 | } |
1620 | ||
8757b776 | 1621 | int dm_table_resume_targets(struct dm_table *t) |
1da177e4 | 1622 | { |
8757b776 MB |
1623 | int i, r = 0; |
1624 | ||
1625 | for (i = 0; i < t->num_targets; i++) { | |
1626 | struct dm_target *ti = t->targets + i; | |
1627 | ||
1628 | if (!ti->type->preresume) | |
1629 | continue; | |
1630 | ||
1631 | r = ti->type->preresume(ti); | |
7833b08e MS |
1632 | if (r) { |
1633 | DMERR("%s: %s: preresume failed, error = %d", | |
1634 | dm_device_name(t->md), ti->type->name, r); | |
8757b776 | 1635 | return r; |
7833b08e | 1636 | } |
8757b776 | 1637 | } |
1da177e4 LT |
1638 | |
1639 | for (i = 0; i < t->num_targets; i++) { | |
1640 | struct dm_target *ti = t->targets + i; | |
1641 | ||
1642 | if (ti->type->resume) | |
1643 | ti->type->resume(ti); | |
1644 | } | |
8757b776 MB |
1645 | |
1646 | return 0; | |
1da177e4 LT |
1647 | } |
1648 | ||
9d357b07 N |
1649 | void dm_table_add_target_callbacks(struct dm_table *t, struct dm_target_callbacks *cb) |
1650 | { | |
1651 | list_add(&cb->list, &t->target_callbacks); | |
1652 | } | |
1653 | EXPORT_SYMBOL_GPL(dm_table_add_target_callbacks); | |
1654 | ||
1da177e4 LT |
1655 | int dm_table_any_congested(struct dm_table *t, int bdi_bits) |
1656 | { | |
82b1519b | 1657 | struct dm_dev_internal *dd; |
afb24528 | 1658 | struct list_head *devices = dm_table_get_devices(t); |
9d357b07 | 1659 | struct dm_target_callbacks *cb; |
1da177e4 LT |
1660 | int r = 0; |
1661 | ||
afb24528 | 1662 | list_for_each_entry(dd, devices, list) { |
86f1152b | 1663 | struct request_queue *q = bdev_get_queue(dd->dm_dev->bdev); |
0c2322e4 AK |
1664 | char b[BDEVNAME_SIZE]; |
1665 | ||
1666 | if (likely(q)) | |
1667 | r |= bdi_congested(&q->backing_dev_info, bdi_bits); | |
1668 | else | |
1669 | DMWARN_LIMIT("%s: any_congested: nonexistent device %s", | |
1670 | dm_device_name(t->md), | |
86f1152b | 1671 | bdevname(dd->dm_dev->bdev, b)); |
1da177e4 LT |
1672 | } |
1673 | ||
9d357b07 N |
1674 | list_for_each_entry(cb, &t->target_callbacks, list) |
1675 | if (cb->congested_fn) | |
1676 | r |= cb->congested_fn(cb, bdi_bits); | |
1677 | ||
1da177e4 LT |
1678 | return r; |
1679 | } | |
1680 | ||
1134e5ae MA |
1681 | struct mapped_device *dm_table_get_md(struct dm_table *t) |
1682 | { | |
1134e5ae MA |
1683 | return t->md; |
1684 | } | |
08649012 | 1685 | EXPORT_SYMBOL(dm_table_get_md); |
1134e5ae | 1686 | |
9974fa2c MS |
1687 | void dm_table_run_md_queue_async(struct dm_table *t) |
1688 | { | |
1689 | struct mapped_device *md; | |
1690 | struct request_queue *queue; | |
1691 | unsigned long flags; | |
1692 | ||
1693 | if (!dm_table_request_based(t)) | |
1694 | return; | |
1695 | ||
1696 | md = dm_table_get_md(t); | |
1697 | queue = dm_get_md_queue(md); | |
1698 | if (queue) { | |
bfebd1cd MS |
1699 | if (queue->mq_ops) |
1700 | blk_mq_run_hw_queues(queue, true); | |
1701 | else { | |
1702 | spin_lock_irqsave(queue->queue_lock, flags); | |
1703 | blk_run_queue_async(queue); | |
1704 | spin_unlock_irqrestore(queue->queue_lock, flags); | |
1705 | } | |
9974fa2c MS |
1706 | } |
1707 | } | |
1708 | EXPORT_SYMBOL(dm_table_run_md_queue_async); | |
1709 |