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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2001, 2002 Sistina Software (UK) Limited. | |
784aae73 | 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" | |
51e5b2bd | 9 | #include "dm-uevent.h" |
1da177e4 LT |
10 | |
11 | #include <linux/init.h> | |
12 | #include <linux/module.h> | |
48c9c27b | 13 | #include <linux/mutex.h> |
1da177e4 LT |
14 | #include <linux/moduleparam.h> |
15 | #include <linux/blkpg.h> | |
16 | #include <linux/bio.h> | |
1da177e4 LT |
17 | #include <linux/mempool.h> |
18 | #include <linux/slab.h> | |
19 | #include <linux/idr.h> | |
3ac51e74 | 20 | #include <linux/hdreg.h> |
3f77316d | 21 | #include <linux/delay.h> |
ffcc3936 | 22 | #include <linux/wait.h> |
2eb6e1e3 | 23 | #include <linux/kthread.h> |
0ce65797 | 24 | #include <linux/ktime.h> |
de3ec86d | 25 | #include <linux/elevator.h> /* for rq_end_sector() */ |
bfebd1cd | 26 | #include <linux/blk-mq.h> |
55782138 LZ |
27 | |
28 | #include <trace/events/block.h> | |
1da177e4 | 29 | |
72d94861 AK |
30 | #define DM_MSG_PREFIX "core" |
31 | ||
71a16736 NK |
32 | #ifdef CONFIG_PRINTK |
33 | /* | |
34 | * ratelimit state to be used in DMXXX_LIMIT(). | |
35 | */ | |
36 | DEFINE_RATELIMIT_STATE(dm_ratelimit_state, | |
37 | DEFAULT_RATELIMIT_INTERVAL, | |
38 | DEFAULT_RATELIMIT_BURST); | |
39 | EXPORT_SYMBOL(dm_ratelimit_state); | |
40 | #endif | |
41 | ||
60935eb2 MB |
42 | /* |
43 | * Cookies are numeric values sent with CHANGE and REMOVE | |
44 | * uevents while resuming, removing or renaming the device. | |
45 | */ | |
46 | #define DM_COOKIE_ENV_VAR_NAME "DM_COOKIE" | |
47 | #define DM_COOKIE_LENGTH 24 | |
48 | ||
1da177e4 LT |
49 | static const char *_name = DM_NAME; |
50 | ||
51 | static unsigned int major = 0; | |
52 | static unsigned int _major = 0; | |
53 | ||
d15b774c AK |
54 | static DEFINE_IDR(_minor_idr); |
55 | ||
f32c10b0 | 56 | static DEFINE_SPINLOCK(_minor_lock); |
2c140a24 MP |
57 | |
58 | static void do_deferred_remove(struct work_struct *w); | |
59 | ||
60 | static DECLARE_WORK(deferred_remove_work, do_deferred_remove); | |
61 | ||
acfe0ad7 MP |
62 | static struct workqueue_struct *deferred_remove_workqueue; |
63 | ||
1da177e4 | 64 | /* |
8fbf26ad | 65 | * For bio-based dm. |
1da177e4 LT |
66 | * One of these is allocated per bio. |
67 | */ | |
68 | struct dm_io { | |
69 | struct mapped_device *md; | |
70 | int error; | |
1da177e4 | 71 | atomic_t io_count; |
6ae2fa67 | 72 | struct bio *bio; |
3eaf840e | 73 | unsigned long start_time; |
f88fb981 | 74 | spinlock_t endio_lock; |
fd2ed4d2 | 75 | struct dm_stats_aux stats_aux; |
1da177e4 LT |
76 | }; |
77 | ||
8fbf26ad KU |
78 | /* |
79 | * For request-based dm. | |
80 | * One of these is allocated per request. | |
81 | */ | |
82 | struct dm_rq_target_io { | |
83 | struct mapped_device *md; | |
84 | struct dm_target *ti; | |
1ae49ea2 | 85 | struct request *orig, *clone; |
2eb6e1e3 | 86 | struct kthread_work work; |
8fbf26ad KU |
87 | int error; |
88 | union map_info info; | |
89 | }; | |
90 | ||
91 | /* | |
94818742 KO |
92 | * For request-based dm - the bio clones we allocate are embedded in these |
93 | * structs. | |
94 | * | |
95 | * We allocate these with bio_alloc_bioset, using the front_pad parameter when | |
96 | * the bioset is created - this means the bio has to come at the end of the | |
97 | * struct. | |
8fbf26ad KU |
98 | */ |
99 | struct dm_rq_clone_bio_info { | |
100 | struct bio *orig; | |
cec47e3d | 101 | struct dm_rq_target_io *tio; |
94818742 | 102 | struct bio clone; |
8fbf26ad KU |
103 | }; |
104 | ||
cec47e3d KU |
105 | union map_info *dm_get_rq_mapinfo(struct request *rq) |
106 | { | |
107 | if (rq && rq->end_io_data) | |
108 | return &((struct dm_rq_target_io *)rq->end_io_data)->info; | |
109 | return NULL; | |
110 | } | |
111 | EXPORT_SYMBOL_GPL(dm_get_rq_mapinfo); | |
112 | ||
ba61fdd1 JM |
113 | #define MINOR_ALLOCED ((void *)-1) |
114 | ||
1da177e4 LT |
115 | /* |
116 | * Bits for the md->flags field. | |
117 | */ | |
1eb787ec | 118 | #define DMF_BLOCK_IO_FOR_SUSPEND 0 |
1da177e4 | 119 | #define DMF_SUSPENDED 1 |
aa8d7c2f | 120 | #define DMF_FROZEN 2 |
fba9f90e | 121 | #define DMF_FREEING 3 |
5c6bd75d | 122 | #define DMF_DELETING 4 |
2e93ccc1 | 123 | #define DMF_NOFLUSH_SUSPENDING 5 |
d5b9dd04 | 124 | #define DMF_MERGE_IS_OPTIONAL 6 |
2c140a24 | 125 | #define DMF_DEFERRED_REMOVE 7 |
ffcc3936 | 126 | #define DMF_SUSPENDED_INTERNALLY 8 |
1da177e4 | 127 | |
83d5e5b0 MP |
128 | /* |
129 | * A dummy definition to make RCU happy. | |
130 | * struct dm_table should never be dereferenced in this file. | |
131 | */ | |
132 | struct dm_table { | |
133 | int undefined__; | |
134 | }; | |
135 | ||
304f3f6a MB |
136 | /* |
137 | * Work processed by per-device workqueue. | |
138 | */ | |
1da177e4 | 139 | struct mapped_device { |
83d5e5b0 | 140 | struct srcu_struct io_barrier; |
e61290a4 | 141 | struct mutex suspend_lock; |
1da177e4 | 142 | atomic_t holders; |
5c6bd75d | 143 | atomic_t open_count; |
1da177e4 | 144 | |
2a7faeb1 MP |
145 | /* |
146 | * The current mapping. | |
147 | * Use dm_get_live_table{_fast} or take suspend_lock for | |
148 | * dereference. | |
149 | */ | |
6fa99520 | 150 | struct dm_table __rcu *map; |
2a7faeb1 | 151 | |
86f1152b BM |
152 | struct list_head table_devices; |
153 | struct mutex table_devices_lock; | |
154 | ||
1da177e4 LT |
155 | unsigned long flags; |
156 | ||
165125e1 | 157 | struct request_queue *queue; |
a5664dad | 158 | unsigned type; |
4a0b4ddf | 159 | /* Protect queue and type against concurrent access. */ |
a5664dad MS |
160 | struct mutex type_lock; |
161 | ||
36a0456f AK |
162 | struct target_type *immutable_target_type; |
163 | ||
1da177e4 | 164 | struct gendisk *disk; |
7e51f257 | 165 | char name[16]; |
1da177e4 LT |
166 | |
167 | void *interface_ptr; | |
168 | ||
169 | /* | |
170 | * A list of ios that arrived while we were suspended. | |
171 | */ | |
316d315b | 172 | atomic_t pending[2]; |
1da177e4 | 173 | wait_queue_head_t wait; |
53d5914f | 174 | struct work_struct work; |
74859364 | 175 | struct bio_list deferred; |
022c2611 | 176 | spinlock_t deferred_lock; |
1da177e4 | 177 | |
af7e466a | 178 | /* |
29e4013d | 179 | * Processing queue (flush) |
304f3f6a MB |
180 | */ |
181 | struct workqueue_struct *wq; | |
182 | ||
1da177e4 LT |
183 | /* |
184 | * io objects are allocated from here. | |
185 | */ | |
186 | mempool_t *io_pool; | |
1ae49ea2 | 187 | mempool_t *rq_pool; |
1da177e4 | 188 | |
9faf400f SB |
189 | struct bio_set *bs; |
190 | ||
1da177e4 LT |
191 | /* |
192 | * Event handling. | |
193 | */ | |
194 | atomic_t event_nr; | |
195 | wait_queue_head_t eventq; | |
7a8c3d3b MA |
196 | atomic_t uevent_seq; |
197 | struct list_head uevent_list; | |
198 | spinlock_t uevent_lock; /* Protect access to uevent_list */ | |
1da177e4 LT |
199 | |
200 | /* | |
201 | * freeze/thaw support require holding onto a super block | |
202 | */ | |
203 | struct super_block *frozen_sb; | |
db8fef4f | 204 | struct block_device *bdev; |
3ac51e74 DW |
205 | |
206 | /* forced geometry settings */ | |
207 | struct hd_geometry geometry; | |
784aae73 | 208 | |
2995fa78 MP |
209 | /* kobject and completion */ |
210 | struct dm_kobject_holder kobj_holder; | |
be35f486 | 211 | |
d87f4c14 TH |
212 | /* zero-length flush that will be cloned and submitted to targets */ |
213 | struct bio flush_bio; | |
fd2ed4d2 | 214 | |
96b26c8c MP |
215 | /* the number of internal suspends */ |
216 | unsigned internal_suspend_count; | |
217 | ||
fd2ed4d2 | 218 | struct dm_stats stats; |
2eb6e1e3 KB |
219 | |
220 | struct kthread_worker kworker; | |
221 | struct task_struct *kworker_task; | |
de3ec86d MS |
222 | |
223 | /* for request-based merge heuristic in dm_request_fn() */ | |
0ce65797 | 224 | unsigned seq_rq_merge_deadline_usecs; |
de3ec86d | 225 | int last_rq_rw; |
0ce65797 MS |
226 | sector_t last_rq_pos; |
227 | ktime_t last_rq_start_time; | |
bfebd1cd MS |
228 | |
229 | /* for blk-mq request-based DM support */ | |
230 | struct blk_mq_tag_set tag_set; | |
17e149b8 | 231 | bool use_blk_mq; |
1da177e4 LT |
232 | }; |
233 | ||
17e149b8 MS |
234 | #ifdef CONFIG_DM_MQ_DEFAULT |
235 | static bool use_blk_mq = true; | |
236 | #else | |
237 | static bool use_blk_mq = false; | |
238 | #endif | |
239 | ||
240 | bool dm_use_blk_mq(struct mapped_device *md) | |
241 | { | |
242 | return md->use_blk_mq; | |
243 | } | |
244 | ||
e6ee8c0b KU |
245 | /* |
246 | * For mempools pre-allocation at the table loading time. | |
247 | */ | |
248 | struct dm_md_mempools { | |
249 | mempool_t *io_pool; | |
1ae49ea2 | 250 | mempool_t *rq_pool; |
e6ee8c0b KU |
251 | struct bio_set *bs; |
252 | }; | |
253 | ||
86f1152b BM |
254 | struct table_device { |
255 | struct list_head list; | |
256 | atomic_t count; | |
257 | struct dm_dev dm_dev; | |
258 | }; | |
259 | ||
6cfa5857 MS |
260 | #define RESERVED_BIO_BASED_IOS 16 |
261 | #define RESERVED_REQUEST_BASED_IOS 256 | |
f4790826 | 262 | #define RESERVED_MAX_IOS 1024 |
e18b890b | 263 | static struct kmem_cache *_io_cache; |
8fbf26ad | 264 | static struct kmem_cache *_rq_tio_cache; |
1ae49ea2 | 265 | static struct kmem_cache *_rq_cache; |
94818742 | 266 | |
e8603136 MS |
267 | /* |
268 | * Bio-based DM's mempools' reserved IOs set by the user. | |
269 | */ | |
270 | static unsigned reserved_bio_based_ios = RESERVED_BIO_BASED_IOS; | |
271 | ||
f4790826 MS |
272 | /* |
273 | * Request-based DM's mempools' reserved IOs set by the user. | |
274 | */ | |
275 | static unsigned reserved_rq_based_ios = RESERVED_REQUEST_BASED_IOS; | |
276 | ||
09c2d531 | 277 | static unsigned __dm_get_module_param(unsigned *module_param, |
f4790826 MS |
278 | unsigned def, unsigned max) |
279 | { | |
09c2d531 MS |
280 | unsigned param = ACCESS_ONCE(*module_param); |
281 | unsigned modified_param = 0; | |
f4790826 | 282 | |
09c2d531 MS |
283 | if (!param) |
284 | modified_param = def; | |
285 | else if (param > max) | |
286 | modified_param = max; | |
f4790826 | 287 | |
09c2d531 MS |
288 | if (modified_param) { |
289 | (void)cmpxchg(module_param, param, modified_param); | |
290 | param = modified_param; | |
f4790826 MS |
291 | } |
292 | ||
09c2d531 | 293 | return param; |
f4790826 MS |
294 | } |
295 | ||
e8603136 MS |
296 | unsigned dm_get_reserved_bio_based_ios(void) |
297 | { | |
09c2d531 | 298 | return __dm_get_module_param(&reserved_bio_based_ios, |
e8603136 MS |
299 | RESERVED_BIO_BASED_IOS, RESERVED_MAX_IOS); |
300 | } | |
301 | EXPORT_SYMBOL_GPL(dm_get_reserved_bio_based_ios); | |
302 | ||
f4790826 MS |
303 | unsigned dm_get_reserved_rq_based_ios(void) |
304 | { | |
09c2d531 | 305 | return __dm_get_module_param(&reserved_rq_based_ios, |
f4790826 MS |
306 | RESERVED_REQUEST_BASED_IOS, RESERVED_MAX_IOS); |
307 | } | |
308 | EXPORT_SYMBOL_GPL(dm_get_reserved_rq_based_ios); | |
309 | ||
1da177e4 LT |
310 | static int __init local_init(void) |
311 | { | |
51157b4a | 312 | int r = -ENOMEM; |
1da177e4 | 313 | |
1da177e4 | 314 | /* allocate a slab for the dm_ios */ |
028867ac | 315 | _io_cache = KMEM_CACHE(dm_io, 0); |
1da177e4 | 316 | if (!_io_cache) |
51157b4a | 317 | return r; |
1da177e4 | 318 | |
8fbf26ad KU |
319 | _rq_tio_cache = KMEM_CACHE(dm_rq_target_io, 0); |
320 | if (!_rq_tio_cache) | |
dba14160 | 321 | goto out_free_io_cache; |
8fbf26ad | 322 | |
1ae49ea2 MS |
323 | _rq_cache = kmem_cache_create("dm_clone_request", sizeof(struct request), |
324 | __alignof__(struct request), 0, NULL); | |
325 | if (!_rq_cache) | |
326 | goto out_free_rq_tio_cache; | |
327 | ||
51e5b2bd | 328 | r = dm_uevent_init(); |
51157b4a | 329 | if (r) |
1ae49ea2 | 330 | goto out_free_rq_cache; |
51e5b2bd | 331 | |
acfe0ad7 MP |
332 | deferred_remove_workqueue = alloc_workqueue("kdmremove", WQ_UNBOUND, 1); |
333 | if (!deferred_remove_workqueue) { | |
334 | r = -ENOMEM; | |
335 | goto out_uevent_exit; | |
336 | } | |
337 | ||
1da177e4 LT |
338 | _major = major; |
339 | r = register_blkdev(_major, _name); | |
51157b4a | 340 | if (r < 0) |
acfe0ad7 | 341 | goto out_free_workqueue; |
1da177e4 LT |
342 | |
343 | if (!_major) | |
344 | _major = r; | |
345 | ||
346 | return 0; | |
51157b4a | 347 | |
acfe0ad7 MP |
348 | out_free_workqueue: |
349 | destroy_workqueue(deferred_remove_workqueue); | |
51157b4a KU |
350 | out_uevent_exit: |
351 | dm_uevent_exit(); | |
1ae49ea2 MS |
352 | out_free_rq_cache: |
353 | kmem_cache_destroy(_rq_cache); | |
8fbf26ad KU |
354 | out_free_rq_tio_cache: |
355 | kmem_cache_destroy(_rq_tio_cache); | |
51157b4a KU |
356 | out_free_io_cache: |
357 | kmem_cache_destroy(_io_cache); | |
358 | ||
359 | return r; | |
1da177e4 LT |
360 | } |
361 | ||
362 | static void local_exit(void) | |
363 | { | |
2c140a24 | 364 | flush_scheduled_work(); |
acfe0ad7 | 365 | destroy_workqueue(deferred_remove_workqueue); |
2c140a24 | 366 | |
1ae49ea2 | 367 | kmem_cache_destroy(_rq_cache); |
8fbf26ad | 368 | kmem_cache_destroy(_rq_tio_cache); |
1da177e4 | 369 | kmem_cache_destroy(_io_cache); |
00d59405 | 370 | unregister_blkdev(_major, _name); |
51e5b2bd | 371 | dm_uevent_exit(); |
1da177e4 LT |
372 | |
373 | _major = 0; | |
374 | ||
375 | DMINFO("cleaned up"); | |
376 | } | |
377 | ||
b9249e55 | 378 | static int (*_inits[])(void) __initdata = { |
1da177e4 LT |
379 | local_init, |
380 | dm_target_init, | |
381 | dm_linear_init, | |
382 | dm_stripe_init, | |
952b3557 | 383 | dm_io_init, |
945fa4d2 | 384 | dm_kcopyd_init, |
1da177e4 | 385 | dm_interface_init, |
fd2ed4d2 | 386 | dm_statistics_init, |
1da177e4 LT |
387 | }; |
388 | ||
b9249e55 | 389 | static void (*_exits[])(void) = { |
1da177e4 LT |
390 | local_exit, |
391 | dm_target_exit, | |
392 | dm_linear_exit, | |
393 | dm_stripe_exit, | |
952b3557 | 394 | dm_io_exit, |
945fa4d2 | 395 | dm_kcopyd_exit, |
1da177e4 | 396 | dm_interface_exit, |
fd2ed4d2 | 397 | dm_statistics_exit, |
1da177e4 LT |
398 | }; |
399 | ||
400 | static int __init dm_init(void) | |
401 | { | |
402 | const int count = ARRAY_SIZE(_inits); | |
403 | ||
404 | int r, i; | |
405 | ||
406 | for (i = 0; i < count; i++) { | |
407 | r = _inits[i](); | |
408 | if (r) | |
409 | goto bad; | |
410 | } | |
411 | ||
412 | return 0; | |
413 | ||
414 | bad: | |
415 | while (i--) | |
416 | _exits[i](); | |
417 | ||
418 | return r; | |
419 | } | |
420 | ||
421 | static void __exit dm_exit(void) | |
422 | { | |
423 | int i = ARRAY_SIZE(_exits); | |
424 | ||
425 | while (i--) | |
426 | _exits[i](); | |
d15b774c AK |
427 | |
428 | /* | |
429 | * Should be empty by this point. | |
430 | */ | |
d15b774c | 431 | idr_destroy(&_minor_idr); |
1da177e4 LT |
432 | } |
433 | ||
434 | /* | |
435 | * Block device functions | |
436 | */ | |
432a212c MA |
437 | int dm_deleting_md(struct mapped_device *md) |
438 | { | |
439 | return test_bit(DMF_DELETING, &md->flags); | |
440 | } | |
441 | ||
fe5f9f2c | 442 | static int dm_blk_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
443 | { |
444 | struct mapped_device *md; | |
445 | ||
fba9f90e JM |
446 | spin_lock(&_minor_lock); |
447 | ||
fe5f9f2c | 448 | md = bdev->bd_disk->private_data; |
fba9f90e JM |
449 | if (!md) |
450 | goto out; | |
451 | ||
5c6bd75d | 452 | if (test_bit(DMF_FREEING, &md->flags) || |
432a212c | 453 | dm_deleting_md(md)) { |
fba9f90e JM |
454 | md = NULL; |
455 | goto out; | |
456 | } | |
457 | ||
1da177e4 | 458 | dm_get(md); |
5c6bd75d | 459 | atomic_inc(&md->open_count); |
fba9f90e JM |
460 | out: |
461 | spin_unlock(&_minor_lock); | |
462 | ||
463 | return md ? 0 : -ENXIO; | |
1da177e4 LT |
464 | } |
465 | ||
db2a144b | 466 | static void dm_blk_close(struct gendisk *disk, fmode_t mode) |
1da177e4 | 467 | { |
63a4f065 | 468 | struct mapped_device *md; |
6e9624b8 | 469 | |
4a1aeb98 MB |
470 | spin_lock(&_minor_lock); |
471 | ||
63a4f065 MS |
472 | md = disk->private_data; |
473 | if (WARN_ON(!md)) | |
474 | goto out; | |
475 | ||
2c140a24 MP |
476 | if (atomic_dec_and_test(&md->open_count) && |
477 | (test_bit(DMF_DEFERRED_REMOVE, &md->flags))) | |
acfe0ad7 | 478 | queue_work(deferred_remove_workqueue, &deferred_remove_work); |
2c140a24 | 479 | |
1da177e4 | 480 | dm_put(md); |
63a4f065 | 481 | out: |
4a1aeb98 | 482 | spin_unlock(&_minor_lock); |
1da177e4 LT |
483 | } |
484 | ||
5c6bd75d AK |
485 | int dm_open_count(struct mapped_device *md) |
486 | { | |
487 | return atomic_read(&md->open_count); | |
488 | } | |
489 | ||
490 | /* | |
491 | * Guarantees nothing is using the device before it's deleted. | |
492 | */ | |
2c140a24 | 493 | int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred) |
5c6bd75d AK |
494 | { |
495 | int r = 0; | |
496 | ||
497 | spin_lock(&_minor_lock); | |
498 | ||
2c140a24 | 499 | if (dm_open_count(md)) { |
5c6bd75d | 500 | r = -EBUSY; |
2c140a24 MP |
501 | if (mark_deferred) |
502 | set_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
503 | } else if (only_deferred && !test_bit(DMF_DEFERRED_REMOVE, &md->flags)) | |
504 | r = -EEXIST; | |
5c6bd75d AK |
505 | else |
506 | set_bit(DMF_DELETING, &md->flags); | |
507 | ||
508 | spin_unlock(&_minor_lock); | |
509 | ||
510 | return r; | |
511 | } | |
512 | ||
2c140a24 MP |
513 | int dm_cancel_deferred_remove(struct mapped_device *md) |
514 | { | |
515 | int r = 0; | |
516 | ||
517 | spin_lock(&_minor_lock); | |
518 | ||
519 | if (test_bit(DMF_DELETING, &md->flags)) | |
520 | r = -EBUSY; | |
521 | else | |
522 | clear_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
523 | ||
524 | spin_unlock(&_minor_lock); | |
525 | ||
526 | return r; | |
527 | } | |
528 | ||
529 | static void do_deferred_remove(struct work_struct *w) | |
530 | { | |
531 | dm_deferred_remove(); | |
532 | } | |
533 | ||
fd2ed4d2 MP |
534 | sector_t dm_get_size(struct mapped_device *md) |
535 | { | |
536 | return get_capacity(md->disk); | |
537 | } | |
538 | ||
9974fa2c MS |
539 | struct request_queue *dm_get_md_queue(struct mapped_device *md) |
540 | { | |
541 | return md->queue; | |
542 | } | |
543 | ||
fd2ed4d2 MP |
544 | struct dm_stats *dm_get_stats(struct mapped_device *md) |
545 | { | |
546 | return &md->stats; | |
547 | } | |
548 | ||
3ac51e74 DW |
549 | static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
550 | { | |
551 | struct mapped_device *md = bdev->bd_disk->private_data; | |
552 | ||
553 | return dm_get_geometry(md, geo); | |
554 | } | |
555 | ||
fe5f9f2c | 556 | static int dm_blk_ioctl(struct block_device *bdev, fmode_t mode, |
aa129a22 MB |
557 | unsigned int cmd, unsigned long arg) |
558 | { | |
fe5f9f2c | 559 | struct mapped_device *md = bdev->bd_disk->private_data; |
83d5e5b0 | 560 | int srcu_idx; |
6c182cd8 | 561 | struct dm_table *map; |
aa129a22 MB |
562 | struct dm_target *tgt; |
563 | int r = -ENOTTY; | |
564 | ||
6c182cd8 | 565 | retry: |
83d5e5b0 MP |
566 | map = dm_get_live_table(md, &srcu_idx); |
567 | ||
aa129a22 MB |
568 | if (!map || !dm_table_get_size(map)) |
569 | goto out; | |
570 | ||
571 | /* We only support devices that have a single target */ | |
572 | if (dm_table_get_num_targets(map) != 1) | |
573 | goto out; | |
574 | ||
575 | tgt = dm_table_get_target(map, 0); | |
4d341d82 MS |
576 | if (!tgt->type->ioctl) |
577 | goto out; | |
aa129a22 | 578 | |
4f186f8b | 579 | if (dm_suspended_md(md)) { |
aa129a22 MB |
580 | r = -EAGAIN; |
581 | goto out; | |
582 | } | |
583 | ||
4d341d82 | 584 | r = tgt->type->ioctl(tgt, cmd, arg); |
aa129a22 MB |
585 | |
586 | out: | |
83d5e5b0 | 587 | dm_put_live_table(md, srcu_idx); |
aa129a22 | 588 | |
6c182cd8 HR |
589 | if (r == -ENOTCONN) { |
590 | msleep(10); | |
591 | goto retry; | |
592 | } | |
593 | ||
aa129a22 MB |
594 | return r; |
595 | } | |
596 | ||
028867ac | 597 | static struct dm_io *alloc_io(struct mapped_device *md) |
1da177e4 LT |
598 | { |
599 | return mempool_alloc(md->io_pool, GFP_NOIO); | |
600 | } | |
601 | ||
028867ac | 602 | static void free_io(struct mapped_device *md, struct dm_io *io) |
1da177e4 LT |
603 | { |
604 | mempool_free(io, md->io_pool); | |
605 | } | |
606 | ||
028867ac | 607 | static void free_tio(struct mapped_device *md, struct dm_target_io *tio) |
1da177e4 | 608 | { |
dba14160 | 609 | bio_put(&tio->clone); |
1da177e4 LT |
610 | } |
611 | ||
08885643 KU |
612 | static struct dm_rq_target_io *alloc_rq_tio(struct mapped_device *md, |
613 | gfp_t gfp_mask) | |
cec47e3d | 614 | { |
5f015204 | 615 | return mempool_alloc(md->io_pool, gfp_mask); |
cec47e3d KU |
616 | } |
617 | ||
618 | static void free_rq_tio(struct dm_rq_target_io *tio) | |
619 | { | |
5f015204 | 620 | mempool_free(tio, tio->md->io_pool); |
cec47e3d KU |
621 | } |
622 | ||
1ae49ea2 MS |
623 | static struct request *alloc_clone_request(struct mapped_device *md, |
624 | gfp_t gfp_mask) | |
625 | { | |
626 | return mempool_alloc(md->rq_pool, gfp_mask); | |
627 | } | |
628 | ||
629 | static void free_clone_request(struct mapped_device *md, struct request *rq) | |
630 | { | |
631 | mempool_free(rq, md->rq_pool); | |
632 | } | |
633 | ||
90abb8c4 KU |
634 | static int md_in_flight(struct mapped_device *md) |
635 | { | |
636 | return atomic_read(&md->pending[READ]) + | |
637 | atomic_read(&md->pending[WRITE]); | |
638 | } | |
639 | ||
3eaf840e JNN |
640 | static void start_io_acct(struct dm_io *io) |
641 | { | |
642 | struct mapped_device *md = io->md; | |
fd2ed4d2 | 643 | struct bio *bio = io->bio; |
c9959059 | 644 | int cpu; |
fd2ed4d2 | 645 | int rw = bio_data_dir(bio); |
3eaf840e JNN |
646 | |
647 | io->start_time = jiffies; | |
648 | ||
074a7aca TH |
649 | cpu = part_stat_lock(); |
650 | part_round_stats(cpu, &dm_disk(md)->part0); | |
651 | part_stat_unlock(); | |
1e9bb880 SL |
652 | atomic_set(&dm_disk(md)->part0.in_flight[rw], |
653 | atomic_inc_return(&md->pending[rw])); | |
fd2ed4d2 MP |
654 | |
655 | if (unlikely(dm_stats_used(&md->stats))) | |
4f024f37 | 656 | dm_stats_account_io(&md->stats, bio->bi_rw, bio->bi_iter.bi_sector, |
fd2ed4d2 | 657 | bio_sectors(bio), false, 0, &io->stats_aux); |
3eaf840e JNN |
658 | } |
659 | ||
d221d2e7 | 660 | static void end_io_acct(struct dm_io *io) |
3eaf840e JNN |
661 | { |
662 | struct mapped_device *md = io->md; | |
663 | struct bio *bio = io->bio; | |
664 | unsigned long duration = jiffies - io->start_time; | |
18c0b223 | 665 | int pending; |
3eaf840e JNN |
666 | int rw = bio_data_dir(bio); |
667 | ||
18c0b223 | 668 | generic_end_io_acct(rw, &dm_disk(md)->part0, io->start_time); |
3eaf840e | 669 | |
fd2ed4d2 | 670 | if (unlikely(dm_stats_used(&md->stats))) |
4f024f37 | 671 | dm_stats_account_io(&md->stats, bio->bi_rw, bio->bi_iter.bi_sector, |
fd2ed4d2 MP |
672 | bio_sectors(bio), true, duration, &io->stats_aux); |
673 | ||
af7e466a MP |
674 | /* |
675 | * After this is decremented the bio must not be touched if it is | |
d87f4c14 | 676 | * a flush. |
af7e466a | 677 | */ |
1e9bb880 SL |
678 | pending = atomic_dec_return(&md->pending[rw]); |
679 | atomic_set(&dm_disk(md)->part0.in_flight[rw], pending); | |
316d315b | 680 | pending += atomic_read(&md->pending[rw^0x1]); |
3eaf840e | 681 | |
d221d2e7 MP |
682 | /* nudge anyone waiting on suspend queue */ |
683 | if (!pending) | |
684 | wake_up(&md->wait); | |
3eaf840e JNN |
685 | } |
686 | ||
1da177e4 LT |
687 | /* |
688 | * Add the bio to the list of deferred io. | |
689 | */ | |
92c63902 | 690 | static void queue_io(struct mapped_device *md, struct bio *bio) |
1da177e4 | 691 | { |
05447420 | 692 | unsigned long flags; |
1da177e4 | 693 | |
05447420 | 694 | spin_lock_irqsave(&md->deferred_lock, flags); |
1da177e4 | 695 | bio_list_add(&md->deferred, bio); |
05447420 | 696 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
6a8736d1 | 697 | queue_work(md->wq, &md->work); |
1da177e4 LT |
698 | } |
699 | ||
700 | /* | |
701 | * Everyone (including functions in this file), should use this | |
702 | * function to access the md->map field, and make sure they call | |
83d5e5b0 | 703 | * dm_put_live_table() when finished. |
1da177e4 | 704 | */ |
83d5e5b0 | 705 | struct dm_table *dm_get_live_table(struct mapped_device *md, int *srcu_idx) __acquires(md->io_barrier) |
1da177e4 | 706 | { |
83d5e5b0 MP |
707 | *srcu_idx = srcu_read_lock(&md->io_barrier); |
708 | ||
709 | return srcu_dereference(md->map, &md->io_barrier); | |
710 | } | |
1da177e4 | 711 | |
83d5e5b0 MP |
712 | void dm_put_live_table(struct mapped_device *md, int srcu_idx) __releases(md->io_barrier) |
713 | { | |
714 | srcu_read_unlock(&md->io_barrier, srcu_idx); | |
715 | } | |
716 | ||
717 | void dm_sync_table(struct mapped_device *md) | |
718 | { | |
719 | synchronize_srcu(&md->io_barrier); | |
720 | synchronize_rcu_expedited(); | |
721 | } | |
722 | ||
723 | /* | |
724 | * A fast alternative to dm_get_live_table/dm_put_live_table. | |
725 | * The caller must not block between these two functions. | |
726 | */ | |
727 | static struct dm_table *dm_get_live_table_fast(struct mapped_device *md) __acquires(RCU) | |
728 | { | |
729 | rcu_read_lock(); | |
730 | return rcu_dereference(md->map); | |
731 | } | |
1da177e4 | 732 | |
83d5e5b0 MP |
733 | static void dm_put_live_table_fast(struct mapped_device *md) __releases(RCU) |
734 | { | |
735 | rcu_read_unlock(); | |
1da177e4 LT |
736 | } |
737 | ||
86f1152b BM |
738 | /* |
739 | * Open a table device so we can use it as a map destination. | |
740 | */ | |
741 | static int open_table_device(struct table_device *td, dev_t dev, | |
742 | struct mapped_device *md) | |
743 | { | |
744 | static char *_claim_ptr = "I belong to device-mapper"; | |
745 | struct block_device *bdev; | |
746 | ||
747 | int r; | |
748 | ||
749 | BUG_ON(td->dm_dev.bdev); | |
750 | ||
751 | bdev = blkdev_get_by_dev(dev, td->dm_dev.mode | FMODE_EXCL, _claim_ptr); | |
752 | if (IS_ERR(bdev)) | |
753 | return PTR_ERR(bdev); | |
754 | ||
755 | r = bd_link_disk_holder(bdev, dm_disk(md)); | |
756 | if (r) { | |
757 | blkdev_put(bdev, td->dm_dev.mode | FMODE_EXCL); | |
758 | return r; | |
759 | } | |
760 | ||
761 | td->dm_dev.bdev = bdev; | |
762 | return 0; | |
763 | } | |
764 | ||
765 | /* | |
766 | * Close a table device that we've been using. | |
767 | */ | |
768 | static void close_table_device(struct table_device *td, struct mapped_device *md) | |
769 | { | |
770 | if (!td->dm_dev.bdev) | |
771 | return; | |
772 | ||
773 | bd_unlink_disk_holder(td->dm_dev.bdev, dm_disk(md)); | |
774 | blkdev_put(td->dm_dev.bdev, td->dm_dev.mode | FMODE_EXCL); | |
775 | td->dm_dev.bdev = NULL; | |
776 | } | |
777 | ||
778 | static struct table_device *find_table_device(struct list_head *l, dev_t dev, | |
779 | fmode_t mode) { | |
780 | struct table_device *td; | |
781 | ||
782 | list_for_each_entry(td, l, list) | |
783 | if (td->dm_dev.bdev->bd_dev == dev && td->dm_dev.mode == mode) | |
784 | return td; | |
785 | ||
786 | return NULL; | |
787 | } | |
788 | ||
789 | int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode, | |
790 | struct dm_dev **result) { | |
791 | int r; | |
792 | struct table_device *td; | |
793 | ||
794 | mutex_lock(&md->table_devices_lock); | |
795 | td = find_table_device(&md->table_devices, dev, mode); | |
796 | if (!td) { | |
797 | td = kmalloc(sizeof(*td), GFP_KERNEL); | |
798 | if (!td) { | |
799 | mutex_unlock(&md->table_devices_lock); | |
800 | return -ENOMEM; | |
801 | } | |
802 | ||
803 | td->dm_dev.mode = mode; | |
804 | td->dm_dev.bdev = NULL; | |
805 | ||
806 | if ((r = open_table_device(td, dev, md))) { | |
807 | mutex_unlock(&md->table_devices_lock); | |
808 | kfree(td); | |
809 | return r; | |
810 | } | |
811 | ||
812 | format_dev_t(td->dm_dev.name, dev); | |
813 | ||
814 | atomic_set(&td->count, 0); | |
815 | list_add(&td->list, &md->table_devices); | |
816 | } | |
817 | atomic_inc(&td->count); | |
818 | mutex_unlock(&md->table_devices_lock); | |
819 | ||
820 | *result = &td->dm_dev; | |
821 | return 0; | |
822 | } | |
823 | EXPORT_SYMBOL_GPL(dm_get_table_device); | |
824 | ||
825 | void dm_put_table_device(struct mapped_device *md, struct dm_dev *d) | |
826 | { | |
827 | struct table_device *td = container_of(d, struct table_device, dm_dev); | |
828 | ||
829 | mutex_lock(&md->table_devices_lock); | |
830 | if (atomic_dec_and_test(&td->count)) { | |
831 | close_table_device(td, md); | |
832 | list_del(&td->list); | |
833 | kfree(td); | |
834 | } | |
835 | mutex_unlock(&md->table_devices_lock); | |
836 | } | |
837 | EXPORT_SYMBOL(dm_put_table_device); | |
838 | ||
839 | static void free_table_devices(struct list_head *devices) | |
840 | { | |
841 | struct list_head *tmp, *next; | |
842 | ||
843 | list_for_each_safe(tmp, next, devices) { | |
844 | struct table_device *td = list_entry(tmp, struct table_device, list); | |
845 | ||
846 | DMWARN("dm_destroy: %s still exists with %d references", | |
847 | td->dm_dev.name, atomic_read(&td->count)); | |
848 | kfree(td); | |
849 | } | |
850 | } | |
851 | ||
3ac51e74 DW |
852 | /* |
853 | * Get the geometry associated with a dm device | |
854 | */ | |
855 | int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo) | |
856 | { | |
857 | *geo = md->geometry; | |
858 | ||
859 | return 0; | |
860 | } | |
861 | ||
862 | /* | |
863 | * Set the geometry of a device. | |
864 | */ | |
865 | int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo) | |
866 | { | |
867 | sector_t sz = (sector_t)geo->cylinders * geo->heads * geo->sectors; | |
868 | ||
869 | if (geo->start > sz) { | |
870 | DMWARN("Start sector is beyond the geometry limits."); | |
871 | return -EINVAL; | |
872 | } | |
873 | ||
874 | md->geometry = *geo; | |
875 | ||
876 | return 0; | |
877 | } | |
878 | ||
1da177e4 LT |
879 | /*----------------------------------------------------------------- |
880 | * CRUD START: | |
881 | * A more elegant soln is in the works that uses the queue | |
882 | * merge fn, unfortunately there are a couple of changes to | |
883 | * the block layer that I want to make for this. So in the | |
884 | * interests of getting something for people to use I give | |
885 | * you this clearly demarcated crap. | |
886 | *---------------------------------------------------------------*/ | |
887 | ||
2e93ccc1 KU |
888 | static int __noflush_suspending(struct mapped_device *md) |
889 | { | |
890 | return test_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); | |
891 | } | |
892 | ||
1da177e4 LT |
893 | /* |
894 | * Decrements the number of outstanding ios that a bio has been | |
895 | * cloned into, completing the original io if necc. | |
896 | */ | |
858119e1 | 897 | static void dec_pending(struct dm_io *io, int error) |
1da177e4 | 898 | { |
2e93ccc1 | 899 | unsigned long flags; |
b35f8caa MB |
900 | int io_error; |
901 | struct bio *bio; | |
902 | struct mapped_device *md = io->md; | |
2e93ccc1 KU |
903 | |
904 | /* Push-back supersedes any I/O errors */ | |
f88fb981 KU |
905 | if (unlikely(error)) { |
906 | spin_lock_irqsave(&io->endio_lock, flags); | |
907 | if (!(io->error > 0 && __noflush_suspending(md))) | |
908 | io->error = error; | |
909 | spin_unlock_irqrestore(&io->endio_lock, flags); | |
910 | } | |
1da177e4 LT |
911 | |
912 | if (atomic_dec_and_test(&io->io_count)) { | |
2e93ccc1 KU |
913 | if (io->error == DM_ENDIO_REQUEUE) { |
914 | /* | |
915 | * Target requested pushing back the I/O. | |
2e93ccc1 | 916 | */ |
022c2611 | 917 | spin_lock_irqsave(&md->deferred_lock, flags); |
6a8736d1 TH |
918 | if (__noflush_suspending(md)) |
919 | bio_list_add_head(&md->deferred, io->bio); | |
920 | else | |
2e93ccc1 KU |
921 | /* noflush suspend was interrupted. */ |
922 | io->error = -EIO; | |
022c2611 | 923 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
2e93ccc1 KU |
924 | } |
925 | ||
b35f8caa MB |
926 | io_error = io->error; |
927 | bio = io->bio; | |
6a8736d1 TH |
928 | end_io_acct(io); |
929 | free_io(md, io); | |
930 | ||
931 | if (io_error == DM_ENDIO_REQUEUE) | |
932 | return; | |
2e93ccc1 | 933 | |
4f024f37 | 934 | if ((bio->bi_rw & REQ_FLUSH) && bio->bi_iter.bi_size) { |
af7e466a | 935 | /* |
6a8736d1 TH |
936 | * Preflush done for flush with data, reissue |
937 | * without REQ_FLUSH. | |
af7e466a | 938 | */ |
6a8736d1 TH |
939 | bio->bi_rw &= ~REQ_FLUSH; |
940 | queue_io(md, bio); | |
af7e466a | 941 | } else { |
b372d360 | 942 | /* done with normal IO or empty flush */ |
0a82a8d1 | 943 | trace_block_bio_complete(md->queue, bio, io_error); |
b372d360 | 944 | bio_endio(bio, io_error); |
b35f8caa | 945 | } |
1da177e4 LT |
946 | } |
947 | } | |
948 | ||
7eee4ae2 MS |
949 | static void disable_write_same(struct mapped_device *md) |
950 | { | |
951 | struct queue_limits *limits = dm_get_queue_limits(md); | |
952 | ||
953 | /* device doesn't really support WRITE SAME, disable it */ | |
954 | limits->max_write_same_sectors = 0; | |
955 | } | |
956 | ||
6712ecf8 | 957 | static void clone_endio(struct bio *bio, int error) |
1da177e4 | 958 | { |
5164bece | 959 | int r = error; |
bfc6d41c | 960 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); |
b35f8caa | 961 | struct dm_io *io = tio->io; |
9faf400f | 962 | struct mapped_device *md = tio->io->md; |
1da177e4 LT |
963 | dm_endio_fn endio = tio->ti->type->end_io; |
964 | ||
1da177e4 LT |
965 | if (!bio_flagged(bio, BIO_UPTODATE) && !error) |
966 | error = -EIO; | |
967 | ||
968 | if (endio) { | |
7de3ee57 | 969 | r = endio(tio->ti, bio, error); |
2e93ccc1 KU |
970 | if (r < 0 || r == DM_ENDIO_REQUEUE) |
971 | /* | |
972 | * error and requeue request are handled | |
973 | * in dec_pending(). | |
974 | */ | |
1da177e4 | 975 | error = r; |
45cbcd79 KU |
976 | else if (r == DM_ENDIO_INCOMPLETE) |
977 | /* The target will handle the io */ | |
6712ecf8 | 978 | return; |
45cbcd79 KU |
979 | else if (r) { |
980 | DMWARN("unimplemented target endio return value: %d", r); | |
981 | BUG(); | |
982 | } | |
1da177e4 LT |
983 | } |
984 | ||
7eee4ae2 MS |
985 | if (unlikely(r == -EREMOTEIO && (bio->bi_rw & REQ_WRITE_SAME) && |
986 | !bdev_get_queue(bio->bi_bdev)->limits.max_write_same_sectors)) | |
987 | disable_write_same(md); | |
988 | ||
9faf400f | 989 | free_tio(md, tio); |
b35f8caa | 990 | dec_pending(io, error); |
1da177e4 LT |
991 | } |
992 | ||
bfebd1cd MS |
993 | static struct dm_rq_target_io *tio_from_request(struct request *rq) |
994 | { | |
995 | return (rq->q->mq_ops ? blk_mq_rq_to_pdu(rq) : rq->special); | |
996 | } | |
997 | ||
cec47e3d KU |
998 | /* |
999 | * Don't touch any member of the md after calling this function because | |
1000 | * the md may be freed in dm_put() at the end of this function. | |
1001 | * Or do dm_get() before calling this function and dm_put() later. | |
1002 | */ | |
466d89a6 | 1003 | static void rq_completed(struct mapped_device *md, int rw, bool run_queue) |
cec47e3d | 1004 | { |
9a0e609e MS |
1005 | int nr_requests_pending; |
1006 | ||
b4324fee | 1007 | atomic_dec(&md->pending[rw]); |
cec47e3d KU |
1008 | |
1009 | /* nudge anyone waiting on suspend queue */ | |
9a0e609e MS |
1010 | nr_requests_pending = md_in_flight(md); |
1011 | if (!nr_requests_pending) | |
cec47e3d KU |
1012 | wake_up(&md->wait); |
1013 | ||
a8c32a5c JA |
1014 | /* |
1015 | * Run this off this callpath, as drivers could invoke end_io while | |
1016 | * inside their request_fn (and holding the queue lock). Calling | |
1017 | * back into ->request_fn() could deadlock attempting to grab the | |
1018 | * queue lock again. | |
1019 | */ | |
9a0e609e | 1020 | if (run_queue) { |
bfebd1cd MS |
1021 | if (md->queue->mq_ops) |
1022 | blk_mq_run_hw_queues(md->queue, true); | |
1023 | else if (!nr_requests_pending || | |
1024 | (nr_requests_pending >= md->queue->nr_congestion_on)) | |
9a0e609e MS |
1025 | blk_run_queue_async(md->queue); |
1026 | } | |
cec47e3d KU |
1027 | |
1028 | /* | |
1029 | * dm_put() must be at the end of this function. See the comment above | |
1030 | */ | |
1031 | dm_put(md); | |
1032 | } | |
1033 | ||
aa6df8dd | 1034 | static void free_rq_clone(struct request *clone, bool must_be_mapped) |
a77e28c7 KU |
1035 | { |
1036 | struct dm_rq_target_io *tio = clone->end_io_data; | |
bfebd1cd | 1037 | struct mapped_device *md = tio->md; |
a77e28c7 | 1038 | |
aa6df8dd MS |
1039 | WARN_ON_ONCE(must_be_mapped && !clone->q); |
1040 | ||
aa6df8dd MS |
1041 | if (md->type == DM_TYPE_MQ_REQUEST_BASED) |
1042 | /* stacked on blk-mq queue(s) */ | |
e5863d9a | 1043 | tio->ti->type->release_clone_rq(clone); |
02233342 MS |
1044 | else if (!md->queue->mq_ops) |
1045 | /* request_fn queue stacked on request_fn queue(s) */ | |
bfebd1cd | 1046 | free_clone_request(md, clone); |
aa6df8dd MS |
1047 | /* |
1048 | * NOTE: for the blk-mq queue stacked on request_fn queue(s) case: | |
1049 | * no need to call free_clone_request() because we leverage blk-mq by | |
1050 | * allocating the clone at the end of the blk-mq pdu (see: clone_rq) | |
1051 | */ | |
bfebd1cd MS |
1052 | |
1053 | if (!md->queue->mq_ops) | |
1054 | free_rq_tio(tio); | |
a77e28c7 KU |
1055 | } |
1056 | ||
980691e5 KU |
1057 | /* |
1058 | * Complete the clone and the original request. | |
466d89a6 KB |
1059 | * Must be called without clone's queue lock held, |
1060 | * see end_clone_request() for more details. | |
980691e5 KU |
1061 | */ |
1062 | static void dm_end_request(struct request *clone, int error) | |
1063 | { | |
1064 | int rw = rq_data_dir(clone); | |
1065 | struct dm_rq_target_io *tio = clone->end_io_data; | |
1066 | struct mapped_device *md = tio->md; | |
1067 | struct request *rq = tio->orig; | |
1068 | ||
29e4013d | 1069 | if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { |
980691e5 KU |
1070 | rq->errors = clone->errors; |
1071 | rq->resid_len = clone->resid_len; | |
1072 | ||
1073 | if (rq->sense) | |
1074 | /* | |
1075 | * We are using the sense buffer of the original | |
1076 | * request. | |
1077 | * So setting the length of the sense data is enough. | |
1078 | */ | |
1079 | rq->sense_len = clone->sense_len; | |
1080 | } | |
1081 | ||
aa6df8dd | 1082 | free_rq_clone(clone, true); |
bfebd1cd MS |
1083 | if (!rq->q->mq_ops) |
1084 | blk_end_request_all(rq, error); | |
1085 | else | |
1086 | blk_mq_end_request(rq, error); | |
29e4013d | 1087 | rq_completed(md, rw, true); |
980691e5 KU |
1088 | } |
1089 | ||
cec47e3d KU |
1090 | static void dm_unprep_request(struct request *rq) |
1091 | { | |
bfebd1cd | 1092 | struct dm_rq_target_io *tio = tio_from_request(rq); |
466d89a6 | 1093 | struct request *clone = tio->clone; |
cec47e3d | 1094 | |
bfebd1cd MS |
1095 | if (!rq->q->mq_ops) { |
1096 | rq->special = NULL; | |
1097 | rq->cmd_flags &= ~REQ_DONTPREP; | |
1098 | } | |
cec47e3d | 1099 | |
e5863d9a | 1100 | if (clone) |
aa6df8dd | 1101 | free_rq_clone(clone, false); |
cec47e3d KU |
1102 | } |
1103 | ||
1104 | /* | |
1105 | * Requeue the original request of a clone. | |
1106 | */ | |
bfebd1cd | 1107 | static void old_requeue_request(struct request *rq) |
cec47e3d | 1108 | { |
cec47e3d KU |
1109 | struct request_queue *q = rq->q; |
1110 | unsigned long flags; | |
1111 | ||
cec47e3d | 1112 | spin_lock_irqsave(q->queue_lock, flags); |
cec47e3d KU |
1113 | blk_requeue_request(q, rq); |
1114 | spin_unlock_irqrestore(q->queue_lock, flags); | |
bfebd1cd MS |
1115 | } |
1116 | ||
1117 | static void dm_requeue_unmapped_original_request(struct mapped_device *md, | |
1118 | struct request *rq) | |
1119 | { | |
1120 | int rw = rq_data_dir(rq); | |
1121 | ||
1122 | dm_unprep_request(rq); | |
1123 | ||
1124 | if (!rq->q->mq_ops) | |
1125 | old_requeue_request(rq); | |
1126 | else { | |
1127 | blk_mq_requeue_request(rq); | |
1128 | blk_mq_kick_requeue_list(rq->q); | |
1129 | } | |
cec47e3d | 1130 | |
466d89a6 KB |
1131 | rq_completed(md, rw, false); |
1132 | } | |
1133 | ||
1134 | static void dm_requeue_unmapped_request(struct request *clone) | |
1135 | { | |
1136 | struct dm_rq_target_io *tio = clone->end_io_data; | |
1137 | ||
1138 | dm_requeue_unmapped_original_request(tio->md, tio->orig); | |
cec47e3d | 1139 | } |
cec47e3d | 1140 | |
bfebd1cd | 1141 | static void old_stop_queue(struct request_queue *q) |
cec47e3d KU |
1142 | { |
1143 | unsigned long flags; | |
1144 | ||
bfebd1cd MS |
1145 | if (blk_queue_stopped(q)) |
1146 | return; | |
1147 | ||
cec47e3d | 1148 | spin_lock_irqsave(q->queue_lock, flags); |
bfebd1cd | 1149 | blk_stop_queue(q); |
cec47e3d KU |
1150 | spin_unlock_irqrestore(q->queue_lock, flags); |
1151 | } | |
1152 | ||
bfebd1cd | 1153 | static void stop_queue(struct request_queue *q) |
cec47e3d | 1154 | { |
bfebd1cd MS |
1155 | if (!q->mq_ops) |
1156 | old_stop_queue(q); | |
1157 | else | |
1158 | blk_mq_stop_hw_queues(q); | |
cec47e3d KU |
1159 | } |
1160 | ||
bfebd1cd | 1161 | static void old_start_queue(struct request_queue *q) |
cec47e3d KU |
1162 | { |
1163 | unsigned long flags; | |
1164 | ||
1165 | spin_lock_irqsave(q->queue_lock, flags); | |
bfebd1cd MS |
1166 | if (blk_queue_stopped(q)) |
1167 | blk_start_queue(q); | |
cec47e3d KU |
1168 | spin_unlock_irqrestore(q->queue_lock, flags); |
1169 | } | |
1170 | ||
bfebd1cd MS |
1171 | static void start_queue(struct request_queue *q) |
1172 | { | |
1173 | if (!q->mq_ops) | |
1174 | old_start_queue(q); | |
1175 | else | |
1176 | blk_mq_start_stopped_hw_queues(q, true); | |
1177 | } | |
1178 | ||
11a68244 | 1179 | static void dm_done(struct request *clone, int error, bool mapped) |
cec47e3d | 1180 | { |
11a68244 | 1181 | int r = error; |
cec47e3d | 1182 | struct dm_rq_target_io *tio = clone->end_io_data; |
ba1cbad9 | 1183 | dm_request_endio_fn rq_end_io = NULL; |
cec47e3d | 1184 | |
ba1cbad9 MS |
1185 | if (tio->ti) { |
1186 | rq_end_io = tio->ti->type->rq_end_io; | |
1187 | ||
1188 | if (mapped && rq_end_io) | |
1189 | r = rq_end_io(tio->ti, clone, error, &tio->info); | |
1190 | } | |
cec47e3d | 1191 | |
7eee4ae2 MS |
1192 | if (unlikely(r == -EREMOTEIO && (clone->cmd_flags & REQ_WRITE_SAME) && |
1193 | !clone->q->limits.max_write_same_sectors)) | |
1194 | disable_write_same(tio->md); | |
1195 | ||
11a68244 | 1196 | if (r <= 0) |
cec47e3d | 1197 | /* The target wants to complete the I/O */ |
11a68244 KU |
1198 | dm_end_request(clone, r); |
1199 | else if (r == DM_ENDIO_INCOMPLETE) | |
cec47e3d KU |
1200 | /* The target will handle the I/O */ |
1201 | return; | |
11a68244 | 1202 | else if (r == DM_ENDIO_REQUEUE) |
cec47e3d KU |
1203 | /* The target wants to requeue the I/O */ |
1204 | dm_requeue_unmapped_request(clone); | |
1205 | else { | |
11a68244 | 1206 | DMWARN("unimplemented target endio return value: %d", r); |
cec47e3d KU |
1207 | BUG(); |
1208 | } | |
1209 | } | |
1210 | ||
11a68244 KU |
1211 | /* |
1212 | * Request completion handler for request-based dm | |
1213 | */ | |
1214 | static void dm_softirq_done(struct request *rq) | |
1215 | { | |
1216 | bool mapped = true; | |
bfebd1cd | 1217 | struct dm_rq_target_io *tio = tio_from_request(rq); |
466d89a6 | 1218 | struct request *clone = tio->clone; |
bfebd1cd | 1219 | int rw; |
11a68244 | 1220 | |
e5863d9a | 1221 | if (!clone) { |
bfebd1cd MS |
1222 | rw = rq_data_dir(rq); |
1223 | if (!rq->q->mq_ops) { | |
1224 | blk_end_request_all(rq, tio->error); | |
1225 | rq_completed(tio->md, rw, false); | |
1226 | free_rq_tio(tio); | |
1227 | } else { | |
1228 | blk_mq_end_request(rq, tio->error); | |
1229 | rq_completed(tio->md, rw, false); | |
1230 | } | |
e5863d9a MS |
1231 | return; |
1232 | } | |
11a68244 KU |
1233 | |
1234 | if (rq->cmd_flags & REQ_FAILED) | |
1235 | mapped = false; | |
1236 | ||
1237 | dm_done(clone, tio->error, mapped); | |
1238 | } | |
1239 | ||
cec47e3d KU |
1240 | /* |
1241 | * Complete the clone and the original request with the error status | |
1242 | * through softirq context. | |
1243 | */ | |
466d89a6 | 1244 | static void dm_complete_request(struct request *rq, int error) |
cec47e3d | 1245 | { |
bfebd1cd | 1246 | struct dm_rq_target_io *tio = tio_from_request(rq); |
cec47e3d KU |
1247 | |
1248 | tio->error = error; | |
cec47e3d KU |
1249 | blk_complete_request(rq); |
1250 | } | |
1251 | ||
1252 | /* | |
1253 | * Complete the not-mapped clone and the original request with the error status | |
1254 | * through softirq context. | |
1255 | * Target's rq_end_io() function isn't called. | |
e5863d9a | 1256 | * This may be used when the target's map_rq() or clone_and_map_rq() functions fail. |
cec47e3d | 1257 | */ |
466d89a6 | 1258 | static void dm_kill_unmapped_request(struct request *rq, int error) |
cec47e3d | 1259 | { |
cec47e3d | 1260 | rq->cmd_flags |= REQ_FAILED; |
466d89a6 | 1261 | dm_complete_request(rq, error); |
cec47e3d | 1262 | } |
cec47e3d KU |
1263 | |
1264 | /* | |
bfebd1cd | 1265 | * Called with the clone's queue lock held (for non-blk-mq) |
cec47e3d KU |
1266 | */ |
1267 | static void end_clone_request(struct request *clone, int error) | |
1268 | { | |
466d89a6 KB |
1269 | struct dm_rq_target_io *tio = clone->end_io_data; |
1270 | ||
e5863d9a MS |
1271 | if (!clone->q->mq_ops) { |
1272 | /* | |
1273 | * For just cleaning up the information of the queue in which | |
1274 | * the clone was dispatched. | |
1275 | * The clone is *NOT* freed actually here because it is alloced | |
1276 | * from dm own mempool (REQ_ALLOCED isn't set). | |
1277 | */ | |
1278 | __blk_put_request(clone->q, clone); | |
1279 | } | |
cec47e3d KU |
1280 | |
1281 | /* | |
1282 | * Actual request completion is done in a softirq context which doesn't | |
466d89a6 | 1283 | * hold the clone's queue lock. Otherwise, deadlock could occur because: |
cec47e3d KU |
1284 | * - another request may be submitted by the upper level driver |
1285 | * of the stacking during the completion | |
1286 | * - the submission which requires queue lock may be done | |
466d89a6 | 1287 | * against this clone's queue |
cec47e3d | 1288 | */ |
466d89a6 | 1289 | dm_complete_request(tio->orig, error); |
cec47e3d KU |
1290 | } |
1291 | ||
56a67df7 MS |
1292 | /* |
1293 | * Return maximum size of I/O possible at the supplied sector up to the current | |
1294 | * target boundary. | |
1295 | */ | |
1296 | static sector_t max_io_len_target_boundary(sector_t sector, struct dm_target *ti) | |
1297 | { | |
1298 | sector_t target_offset = dm_target_offset(ti, sector); | |
1299 | ||
1300 | return ti->len - target_offset; | |
1301 | } | |
1302 | ||
1303 | static sector_t max_io_len(sector_t sector, struct dm_target *ti) | |
1da177e4 | 1304 | { |
56a67df7 | 1305 | sector_t len = max_io_len_target_boundary(sector, ti); |
542f9038 | 1306 | sector_t offset, max_len; |
1da177e4 LT |
1307 | |
1308 | /* | |
542f9038 | 1309 | * Does the target need to split even further? |
1da177e4 | 1310 | */ |
542f9038 MS |
1311 | if (ti->max_io_len) { |
1312 | offset = dm_target_offset(ti, sector); | |
1313 | if (unlikely(ti->max_io_len & (ti->max_io_len - 1))) | |
1314 | max_len = sector_div(offset, ti->max_io_len); | |
1315 | else | |
1316 | max_len = offset & (ti->max_io_len - 1); | |
1317 | max_len = ti->max_io_len - max_len; | |
1318 | ||
1319 | if (len > max_len) | |
1320 | len = max_len; | |
1da177e4 LT |
1321 | } |
1322 | ||
1323 | return len; | |
1324 | } | |
1325 | ||
542f9038 MS |
1326 | int dm_set_target_max_io_len(struct dm_target *ti, sector_t len) |
1327 | { | |
1328 | if (len > UINT_MAX) { | |
1329 | DMERR("Specified maximum size of target IO (%llu) exceeds limit (%u)", | |
1330 | (unsigned long long)len, UINT_MAX); | |
1331 | ti->error = "Maximum size of target IO is too large"; | |
1332 | return -EINVAL; | |
1333 | } | |
1334 | ||
1335 | ti->max_io_len = (uint32_t) len; | |
1336 | ||
1337 | return 0; | |
1338 | } | |
1339 | EXPORT_SYMBOL_GPL(dm_set_target_max_io_len); | |
1340 | ||
1dd40c3e MP |
1341 | /* |
1342 | * A target may call dm_accept_partial_bio only from the map routine. It is | |
1343 | * allowed for all bio types except REQ_FLUSH. | |
1344 | * | |
1345 | * dm_accept_partial_bio informs the dm that the target only wants to process | |
1346 | * additional n_sectors sectors of the bio and the rest of the data should be | |
1347 | * sent in a next bio. | |
1348 | * | |
1349 | * A diagram that explains the arithmetics: | |
1350 | * +--------------------+---------------+-------+ | |
1351 | * | 1 | 2 | 3 | | |
1352 | * +--------------------+---------------+-------+ | |
1353 | * | |
1354 | * <-------------- *tio->len_ptr ---------------> | |
1355 | * <------- bi_size -------> | |
1356 | * <-- n_sectors --> | |
1357 | * | |
1358 | * Region 1 was already iterated over with bio_advance or similar function. | |
1359 | * (it may be empty if the target doesn't use bio_advance) | |
1360 | * Region 2 is the remaining bio size that the target wants to process. | |
1361 | * (it may be empty if region 1 is non-empty, although there is no reason | |
1362 | * to make it empty) | |
1363 | * The target requires that region 3 is to be sent in the next bio. | |
1364 | * | |
1365 | * If the target wants to receive multiple copies of the bio (via num_*bios, etc), | |
1366 | * the partially processed part (the sum of regions 1+2) must be the same for all | |
1367 | * copies of the bio. | |
1368 | */ | |
1369 | void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors) | |
1370 | { | |
1371 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); | |
1372 | unsigned bi_size = bio->bi_iter.bi_size >> SECTOR_SHIFT; | |
1373 | BUG_ON(bio->bi_rw & REQ_FLUSH); | |
1374 | BUG_ON(bi_size > *tio->len_ptr); | |
1375 | BUG_ON(n_sectors > bi_size); | |
1376 | *tio->len_ptr -= bi_size - n_sectors; | |
1377 | bio->bi_iter.bi_size = n_sectors << SECTOR_SHIFT; | |
1378 | } | |
1379 | EXPORT_SYMBOL_GPL(dm_accept_partial_bio); | |
1380 | ||
bd2a49b8 | 1381 | static void __map_bio(struct dm_target_io *tio) |
1da177e4 LT |
1382 | { |
1383 | int r; | |
2056a782 | 1384 | sector_t sector; |
9faf400f | 1385 | struct mapped_device *md; |
dba14160 | 1386 | struct bio *clone = &tio->clone; |
bd2a49b8 | 1387 | struct dm_target *ti = tio->ti; |
1da177e4 | 1388 | |
1da177e4 | 1389 | clone->bi_end_io = clone_endio; |
1da177e4 LT |
1390 | |
1391 | /* | |
1392 | * Map the clone. If r == 0 we don't need to do | |
1393 | * anything, the target has assumed ownership of | |
1394 | * this io. | |
1395 | */ | |
1396 | atomic_inc(&tio->io->io_count); | |
4f024f37 | 1397 | sector = clone->bi_iter.bi_sector; |
7de3ee57 | 1398 | r = ti->type->map(ti, clone); |
45cbcd79 | 1399 | if (r == DM_MAPIO_REMAPPED) { |
1da177e4 | 1400 | /* the bio has been remapped so dispatch it */ |
2056a782 | 1401 | |
d07335e5 MS |
1402 | trace_block_bio_remap(bdev_get_queue(clone->bi_bdev), clone, |
1403 | tio->io->bio->bi_bdev->bd_dev, sector); | |
2056a782 | 1404 | |
1da177e4 | 1405 | generic_make_request(clone); |
2e93ccc1 KU |
1406 | } else if (r < 0 || r == DM_MAPIO_REQUEUE) { |
1407 | /* error the io and bail out, or requeue it if needed */ | |
9faf400f SB |
1408 | md = tio->io->md; |
1409 | dec_pending(tio->io, r); | |
9faf400f | 1410 | free_tio(md, tio); |
45cbcd79 KU |
1411 | } else if (r) { |
1412 | DMWARN("unimplemented target map return value: %d", r); | |
1413 | BUG(); | |
1da177e4 LT |
1414 | } |
1415 | } | |
1416 | ||
1417 | struct clone_info { | |
1418 | struct mapped_device *md; | |
1419 | struct dm_table *map; | |
1420 | struct bio *bio; | |
1421 | struct dm_io *io; | |
1422 | sector_t sector; | |
e0d6609a | 1423 | unsigned sector_count; |
1da177e4 LT |
1424 | }; |
1425 | ||
e0d6609a | 1426 | static void bio_setup_sector(struct bio *bio, sector_t sector, unsigned len) |
bd2a49b8 | 1427 | { |
4f024f37 KO |
1428 | bio->bi_iter.bi_sector = sector; |
1429 | bio->bi_iter.bi_size = to_bytes(len); | |
1da177e4 LT |
1430 | } |
1431 | ||
1432 | /* | |
1433 | * Creates a bio that consists of range of complete bvecs. | |
1434 | */ | |
dba14160 | 1435 | static void clone_bio(struct dm_target_io *tio, struct bio *bio, |
1c3b13e6 | 1436 | sector_t sector, unsigned len) |
1da177e4 | 1437 | { |
dba14160 | 1438 | struct bio *clone = &tio->clone; |
1da177e4 | 1439 | |
1c3b13e6 KO |
1440 | __bio_clone_fast(clone, bio); |
1441 | ||
1442 | if (bio_integrity(bio)) | |
1443 | bio_integrity_clone(clone, bio, GFP_NOIO); | |
bd2a49b8 | 1444 | |
1c3b13e6 KO |
1445 | bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector)); |
1446 | clone->bi_iter.bi_size = to_bytes(len); | |
1447 | ||
1448 | if (bio_integrity(bio)) | |
1449 | bio_integrity_trim(clone, 0, len); | |
1da177e4 LT |
1450 | } |
1451 | ||
9015df24 | 1452 | static struct dm_target_io *alloc_tio(struct clone_info *ci, |
99778273 | 1453 | struct dm_target *ti, |
55a62eef | 1454 | unsigned target_bio_nr) |
f9ab94ce | 1455 | { |
dba14160 MP |
1456 | struct dm_target_io *tio; |
1457 | struct bio *clone; | |
1458 | ||
99778273 | 1459 | clone = bio_alloc_bioset(GFP_NOIO, 0, ci->md->bs); |
dba14160 | 1460 | tio = container_of(clone, struct dm_target_io, clone); |
f9ab94ce MP |
1461 | |
1462 | tio->io = ci->io; | |
1463 | tio->ti = ti; | |
55a62eef | 1464 | tio->target_bio_nr = target_bio_nr; |
9015df24 AK |
1465 | |
1466 | return tio; | |
1467 | } | |
1468 | ||
14fe594d AK |
1469 | static void __clone_and_map_simple_bio(struct clone_info *ci, |
1470 | struct dm_target *ti, | |
1dd40c3e | 1471 | unsigned target_bio_nr, unsigned *len) |
9015df24 | 1472 | { |
99778273 | 1473 | struct dm_target_io *tio = alloc_tio(ci, ti, target_bio_nr); |
dba14160 | 1474 | struct bio *clone = &tio->clone; |
9015df24 | 1475 | |
1dd40c3e MP |
1476 | tio->len_ptr = len; |
1477 | ||
99778273 | 1478 | __bio_clone_fast(clone, ci->bio); |
bd2a49b8 | 1479 | if (len) |
1dd40c3e | 1480 | bio_setup_sector(clone, ci->sector, *len); |
f9ab94ce | 1481 | |
bd2a49b8 | 1482 | __map_bio(tio); |
f9ab94ce MP |
1483 | } |
1484 | ||
14fe594d | 1485 | static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti, |
1dd40c3e | 1486 | unsigned num_bios, unsigned *len) |
06a426ce | 1487 | { |
55a62eef | 1488 | unsigned target_bio_nr; |
06a426ce | 1489 | |
55a62eef | 1490 | for (target_bio_nr = 0; target_bio_nr < num_bios; target_bio_nr++) |
14fe594d | 1491 | __clone_and_map_simple_bio(ci, ti, target_bio_nr, len); |
06a426ce MS |
1492 | } |
1493 | ||
14fe594d | 1494 | static int __send_empty_flush(struct clone_info *ci) |
f9ab94ce | 1495 | { |
06a426ce | 1496 | unsigned target_nr = 0; |
f9ab94ce MP |
1497 | struct dm_target *ti; |
1498 | ||
b372d360 | 1499 | BUG_ON(bio_has_data(ci->bio)); |
f9ab94ce | 1500 | while ((ti = dm_table_get_target(ci->map, target_nr++))) |
1dd40c3e | 1501 | __send_duplicate_bios(ci, ti, ti->num_flush_bios, NULL); |
f9ab94ce | 1502 | |
f9ab94ce MP |
1503 | return 0; |
1504 | } | |
1505 | ||
e4c93811 | 1506 | static void __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti, |
1dd40c3e | 1507 | sector_t sector, unsigned *len) |
5ae89a87 | 1508 | { |
dba14160 | 1509 | struct bio *bio = ci->bio; |
5ae89a87 | 1510 | struct dm_target_io *tio; |
b0d8ed4d AK |
1511 | unsigned target_bio_nr; |
1512 | unsigned num_target_bios = 1; | |
5ae89a87 | 1513 | |
b0d8ed4d AK |
1514 | /* |
1515 | * Does the target want to receive duplicate copies of the bio? | |
1516 | */ | |
1517 | if (bio_data_dir(bio) == WRITE && ti->num_write_bios) | |
1518 | num_target_bios = ti->num_write_bios(ti, bio); | |
e4c93811 | 1519 | |
b0d8ed4d | 1520 | for (target_bio_nr = 0; target_bio_nr < num_target_bios; target_bio_nr++) { |
99778273 | 1521 | tio = alloc_tio(ci, ti, target_bio_nr); |
1dd40c3e MP |
1522 | tio->len_ptr = len; |
1523 | clone_bio(tio, bio, sector, *len); | |
b0d8ed4d AK |
1524 | __map_bio(tio); |
1525 | } | |
5ae89a87 MS |
1526 | } |
1527 | ||
55a62eef | 1528 | typedef unsigned (*get_num_bios_fn)(struct dm_target *ti); |
23508a96 | 1529 | |
55a62eef | 1530 | static unsigned get_num_discard_bios(struct dm_target *ti) |
23508a96 | 1531 | { |
55a62eef | 1532 | return ti->num_discard_bios; |
23508a96 MS |
1533 | } |
1534 | ||
55a62eef | 1535 | static unsigned get_num_write_same_bios(struct dm_target *ti) |
23508a96 | 1536 | { |
55a62eef | 1537 | return ti->num_write_same_bios; |
23508a96 MS |
1538 | } |
1539 | ||
1540 | typedef bool (*is_split_required_fn)(struct dm_target *ti); | |
1541 | ||
1542 | static bool is_split_required_for_discard(struct dm_target *ti) | |
1543 | { | |
55a62eef | 1544 | return ti->split_discard_bios; |
23508a96 MS |
1545 | } |
1546 | ||
14fe594d AK |
1547 | static int __send_changing_extent_only(struct clone_info *ci, |
1548 | get_num_bios_fn get_num_bios, | |
1549 | is_split_required_fn is_split_required) | |
5ae89a87 MS |
1550 | { |
1551 | struct dm_target *ti; | |
e0d6609a | 1552 | unsigned len; |
55a62eef | 1553 | unsigned num_bios; |
5ae89a87 | 1554 | |
a79245b3 MS |
1555 | do { |
1556 | ti = dm_table_find_target(ci->map, ci->sector); | |
1557 | if (!dm_target_is_valid(ti)) | |
1558 | return -EIO; | |
5ae89a87 | 1559 | |
5ae89a87 | 1560 | /* |
23508a96 MS |
1561 | * Even though the device advertised support for this type of |
1562 | * request, that does not mean every target supports it, and | |
936688d7 | 1563 | * reconfiguration might also have changed that since the |
a79245b3 | 1564 | * check was performed. |
5ae89a87 | 1565 | */ |
55a62eef AK |
1566 | num_bios = get_num_bios ? get_num_bios(ti) : 0; |
1567 | if (!num_bios) | |
a79245b3 | 1568 | return -EOPNOTSUPP; |
5ae89a87 | 1569 | |
23508a96 | 1570 | if (is_split_required && !is_split_required(ti)) |
e0d6609a | 1571 | len = min((sector_t)ci->sector_count, max_io_len_target_boundary(ci->sector, ti)); |
7acf0277 | 1572 | else |
e0d6609a | 1573 | len = min((sector_t)ci->sector_count, max_io_len(ci->sector, ti)); |
06a426ce | 1574 | |
1dd40c3e | 1575 | __send_duplicate_bios(ci, ti, num_bios, &len); |
a79245b3 MS |
1576 | |
1577 | ci->sector += len; | |
1578 | } while (ci->sector_count -= len); | |
5ae89a87 MS |
1579 | |
1580 | return 0; | |
1581 | } | |
1582 | ||
14fe594d | 1583 | static int __send_discard(struct clone_info *ci) |
23508a96 | 1584 | { |
14fe594d AK |
1585 | return __send_changing_extent_only(ci, get_num_discard_bios, |
1586 | is_split_required_for_discard); | |
23508a96 MS |
1587 | } |
1588 | ||
14fe594d | 1589 | static int __send_write_same(struct clone_info *ci) |
23508a96 | 1590 | { |
14fe594d | 1591 | return __send_changing_extent_only(ci, get_num_write_same_bios, NULL); |
23508a96 MS |
1592 | } |
1593 | ||
e4c93811 AK |
1594 | /* |
1595 | * Select the correct strategy for processing a non-flush bio. | |
1596 | */ | |
14fe594d | 1597 | static int __split_and_process_non_flush(struct clone_info *ci) |
1da177e4 | 1598 | { |
dba14160 | 1599 | struct bio *bio = ci->bio; |
512875bd | 1600 | struct dm_target *ti; |
1c3b13e6 | 1601 | unsigned len; |
1da177e4 | 1602 | |
5ae89a87 | 1603 | if (unlikely(bio->bi_rw & REQ_DISCARD)) |
14fe594d | 1604 | return __send_discard(ci); |
23508a96 | 1605 | else if (unlikely(bio->bi_rw & REQ_WRITE_SAME)) |
14fe594d | 1606 | return __send_write_same(ci); |
5ae89a87 | 1607 | |
512875bd JN |
1608 | ti = dm_table_find_target(ci->map, ci->sector); |
1609 | if (!dm_target_is_valid(ti)) | |
1610 | return -EIO; | |
1611 | ||
1c3b13e6 | 1612 | len = min_t(sector_t, max_io_len(ci->sector, ti), ci->sector_count); |
1da177e4 | 1613 | |
1dd40c3e | 1614 | __clone_and_map_data_bio(ci, ti, ci->sector, &len); |
1da177e4 | 1615 | |
1c3b13e6 KO |
1616 | ci->sector += len; |
1617 | ci->sector_count -= len; | |
1da177e4 | 1618 | |
1c3b13e6 | 1619 | return 0; |
1da177e4 LT |
1620 | } |
1621 | ||
1622 | /* | |
14fe594d | 1623 | * Entry point to split a bio into clones and submit them to the targets. |
1da177e4 | 1624 | */ |
83d5e5b0 MP |
1625 | static void __split_and_process_bio(struct mapped_device *md, |
1626 | struct dm_table *map, struct bio *bio) | |
1da177e4 LT |
1627 | { |
1628 | struct clone_info ci; | |
512875bd | 1629 | int error = 0; |
1da177e4 | 1630 | |
83d5e5b0 | 1631 | if (unlikely(!map)) { |
6a8736d1 | 1632 | bio_io_error(bio); |
f0b9a450 MP |
1633 | return; |
1634 | } | |
692d0eb9 | 1635 | |
83d5e5b0 | 1636 | ci.map = map; |
1da177e4 | 1637 | ci.md = md; |
1da177e4 LT |
1638 | ci.io = alloc_io(md); |
1639 | ci.io->error = 0; | |
1640 | atomic_set(&ci.io->io_count, 1); | |
1641 | ci.io->bio = bio; | |
1642 | ci.io->md = md; | |
f88fb981 | 1643 | spin_lock_init(&ci.io->endio_lock); |
4f024f37 | 1644 | ci.sector = bio->bi_iter.bi_sector; |
1da177e4 | 1645 | |
3eaf840e | 1646 | start_io_acct(ci.io); |
bd2a49b8 | 1647 | |
b372d360 MS |
1648 | if (bio->bi_rw & REQ_FLUSH) { |
1649 | ci.bio = &ci.md->flush_bio; | |
1650 | ci.sector_count = 0; | |
14fe594d | 1651 | error = __send_empty_flush(&ci); |
b372d360 MS |
1652 | /* dec_pending submits any data associated with flush */ |
1653 | } else { | |
6a8736d1 | 1654 | ci.bio = bio; |
d87f4c14 | 1655 | ci.sector_count = bio_sectors(bio); |
b372d360 | 1656 | while (ci.sector_count && !error) |
14fe594d | 1657 | error = __split_and_process_non_flush(&ci); |
d87f4c14 | 1658 | } |
1da177e4 LT |
1659 | |
1660 | /* drop the extra reference count */ | |
512875bd | 1661 | dec_pending(ci.io, error); |
1da177e4 LT |
1662 | } |
1663 | /*----------------------------------------------------------------- | |
1664 | * CRUD END | |
1665 | *---------------------------------------------------------------*/ | |
1666 | ||
f6fccb12 MB |
1667 | static int dm_merge_bvec(struct request_queue *q, |
1668 | struct bvec_merge_data *bvm, | |
1669 | struct bio_vec *biovec) | |
1670 | { | |
1671 | struct mapped_device *md = q->queuedata; | |
83d5e5b0 | 1672 | struct dm_table *map = dm_get_live_table_fast(md); |
f6fccb12 MB |
1673 | struct dm_target *ti; |
1674 | sector_t max_sectors; | |
5037108a | 1675 | int max_size = 0; |
f6fccb12 MB |
1676 | |
1677 | if (unlikely(!map)) | |
5037108a | 1678 | goto out; |
f6fccb12 MB |
1679 | |
1680 | ti = dm_table_find_target(map, bvm->bi_sector); | |
b01cd5ac | 1681 | if (!dm_target_is_valid(ti)) |
83d5e5b0 | 1682 | goto out; |
f6fccb12 MB |
1683 | |
1684 | /* | |
1685 | * Find maximum amount of I/O that won't need splitting | |
1686 | */ | |
56a67df7 | 1687 | max_sectors = min(max_io_len(bvm->bi_sector, ti), |
148e51ba | 1688 | (sector_t) queue_max_sectors(q)); |
f6fccb12 | 1689 | max_size = (max_sectors << SECTOR_SHIFT) - bvm->bi_size; |
148e51ba | 1690 | if (unlikely(max_size < 0)) /* this shouldn't _ever_ happen */ |
f6fccb12 MB |
1691 | max_size = 0; |
1692 | ||
1693 | /* | |
1694 | * merge_bvec_fn() returns number of bytes | |
1695 | * it can accept at this offset | |
1696 | * max is precomputed maximal io size | |
1697 | */ | |
1698 | if (max_size && ti->type->merge) | |
1699 | max_size = ti->type->merge(ti, bvm, biovec, max_size); | |
8cbeb67a MP |
1700 | /* |
1701 | * If the target doesn't support merge method and some of the devices | |
148e51ba MS |
1702 | * provided their merge_bvec method (we know this by looking for the |
1703 | * max_hw_sectors that dm_set_device_limits may set), then we can't | |
1704 | * allow bios with multiple vector entries. So always set max_size | |
1705 | * to 0, and the code below allows just one page. | |
8cbeb67a MP |
1706 | */ |
1707 | else if (queue_max_hw_sectors(q) <= PAGE_SIZE >> 9) | |
8cbeb67a | 1708 | max_size = 0; |
f6fccb12 | 1709 | |
5037108a | 1710 | out: |
83d5e5b0 | 1711 | dm_put_live_table_fast(md); |
f6fccb12 MB |
1712 | /* |
1713 | * Always allow an entire first page | |
1714 | */ | |
1715 | if (max_size <= biovec->bv_len && !(bvm->bi_size >> SECTOR_SHIFT)) | |
1716 | max_size = biovec->bv_len; | |
1717 | ||
f6fccb12 MB |
1718 | return max_size; |
1719 | } | |
1720 | ||
1da177e4 LT |
1721 | /* |
1722 | * The request function that just remaps the bio built up by | |
1723 | * dm_merge_bvec. | |
1724 | */ | |
ff36ab34 | 1725 | static void dm_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 1726 | { |
12f03a49 | 1727 | int rw = bio_data_dir(bio); |
1da177e4 | 1728 | struct mapped_device *md = q->queuedata; |
83d5e5b0 MP |
1729 | int srcu_idx; |
1730 | struct dm_table *map; | |
1da177e4 | 1731 | |
83d5e5b0 | 1732 | map = dm_get_live_table(md, &srcu_idx); |
1da177e4 | 1733 | |
18c0b223 | 1734 | generic_start_io_acct(rw, bio_sectors(bio), &dm_disk(md)->part0); |
12f03a49 | 1735 | |
6a8736d1 TH |
1736 | /* if we're suspended, we have to queue this io for later */ |
1737 | if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags))) { | |
83d5e5b0 | 1738 | dm_put_live_table(md, srcu_idx); |
1da177e4 | 1739 | |
6a8736d1 TH |
1740 | if (bio_rw(bio) != READA) |
1741 | queue_io(md, bio); | |
1742 | else | |
54d9a1b4 | 1743 | bio_io_error(bio); |
5a7bbad2 | 1744 | return; |
1da177e4 LT |
1745 | } |
1746 | ||
83d5e5b0 MP |
1747 | __split_and_process_bio(md, map, bio); |
1748 | dm_put_live_table(md, srcu_idx); | |
5a7bbad2 | 1749 | return; |
cec47e3d KU |
1750 | } |
1751 | ||
fd2ed4d2 | 1752 | int dm_request_based(struct mapped_device *md) |
cec47e3d KU |
1753 | { |
1754 | return blk_queue_stackable(md->queue); | |
1755 | } | |
1756 | ||
466d89a6 | 1757 | static void dm_dispatch_clone_request(struct request *clone, struct request *rq) |
cec47e3d KU |
1758 | { |
1759 | int r; | |
1760 | ||
466d89a6 KB |
1761 | if (blk_queue_io_stat(clone->q)) |
1762 | clone->cmd_flags |= REQ_IO_STAT; | |
cec47e3d | 1763 | |
466d89a6 KB |
1764 | clone->start_time = jiffies; |
1765 | r = blk_insert_cloned_request(clone->q, clone); | |
cec47e3d | 1766 | if (r) |
466d89a6 | 1767 | /* must complete clone in terms of original request */ |
cec47e3d KU |
1768 | dm_complete_request(rq, r); |
1769 | } | |
cec47e3d | 1770 | |
5f1b670d CH |
1771 | static void setup_clone(struct request *clone, struct request *rq, |
1772 | struct dm_rq_target_io *tio) | |
cec47e3d | 1773 | { |
5f1b670d | 1774 | blk_rq_prep_clone(clone, rq); |
cec47e3d KU |
1775 | clone->end_io = end_clone_request; |
1776 | clone->end_io_data = tio; | |
1ae49ea2 | 1777 | tio->clone = clone; |
cec47e3d KU |
1778 | } |
1779 | ||
6facdaff | 1780 | static struct request *clone_rq(struct request *rq, struct mapped_device *md, |
466d89a6 | 1781 | struct dm_rq_target_io *tio, gfp_t gfp_mask) |
1ae49ea2 | 1782 | { |
02233342 MS |
1783 | /* |
1784 | * Do not allocate a clone if tio->clone was already set | |
1785 | * (see: dm_mq_queue_rq). | |
1786 | */ | |
1787 | bool alloc_clone = !tio->clone; | |
1788 | struct request *clone; | |
1ae49ea2 | 1789 | |
02233342 MS |
1790 | if (alloc_clone) { |
1791 | clone = alloc_clone_request(md, gfp_mask); | |
1792 | if (!clone) | |
1793 | return NULL; | |
1794 | } else | |
1795 | clone = tio->clone; | |
1ae49ea2 MS |
1796 | |
1797 | blk_rq_init(NULL, clone); | |
5f1b670d | 1798 | setup_clone(clone, rq, tio); |
1ae49ea2 MS |
1799 | |
1800 | return clone; | |
1801 | } | |
1802 | ||
2eb6e1e3 KB |
1803 | static void map_tio_request(struct kthread_work *work); |
1804 | ||
bfebd1cd MS |
1805 | static void init_tio(struct dm_rq_target_io *tio, struct request *rq, |
1806 | struct mapped_device *md) | |
1807 | { | |
1808 | tio->md = md; | |
1809 | tio->ti = NULL; | |
1810 | tio->clone = NULL; | |
1811 | tio->orig = rq; | |
1812 | tio->error = 0; | |
1813 | memset(&tio->info, 0, sizeof(tio->info)); | |
02233342 MS |
1814 | if (md->kworker_task) |
1815 | init_kthread_work(&tio->work, map_tio_request); | |
bfebd1cd MS |
1816 | } |
1817 | ||
466d89a6 KB |
1818 | static struct dm_rq_target_io *prep_tio(struct request *rq, |
1819 | struct mapped_device *md, gfp_t gfp_mask) | |
6facdaff | 1820 | { |
6facdaff | 1821 | struct dm_rq_target_io *tio; |
e5863d9a MS |
1822 | int srcu_idx; |
1823 | struct dm_table *table; | |
6facdaff KU |
1824 | |
1825 | tio = alloc_rq_tio(md, gfp_mask); | |
1826 | if (!tio) | |
1827 | return NULL; | |
1828 | ||
bfebd1cd | 1829 | init_tio(tio, rq, md); |
6facdaff | 1830 | |
e5863d9a MS |
1831 | table = dm_get_live_table(md, &srcu_idx); |
1832 | if (!dm_table_mq_request_based(table)) { | |
1833 | if (!clone_rq(rq, md, tio, gfp_mask)) { | |
1834 | dm_put_live_table(md, srcu_idx); | |
1835 | free_rq_tio(tio); | |
1836 | return NULL; | |
1837 | } | |
6facdaff | 1838 | } |
e5863d9a | 1839 | dm_put_live_table(md, srcu_idx); |
6facdaff | 1840 | |
466d89a6 | 1841 | return tio; |
6facdaff KU |
1842 | } |
1843 | ||
cec47e3d KU |
1844 | /* |
1845 | * Called with the queue lock held. | |
1846 | */ | |
1847 | static int dm_prep_fn(struct request_queue *q, struct request *rq) | |
1848 | { | |
1849 | struct mapped_device *md = q->queuedata; | |
466d89a6 | 1850 | struct dm_rq_target_io *tio; |
cec47e3d | 1851 | |
cec47e3d KU |
1852 | if (unlikely(rq->special)) { |
1853 | DMWARN("Already has something in rq->special."); | |
1854 | return BLKPREP_KILL; | |
1855 | } | |
1856 | ||
466d89a6 KB |
1857 | tio = prep_tio(rq, md, GFP_ATOMIC); |
1858 | if (!tio) | |
cec47e3d | 1859 | return BLKPREP_DEFER; |
cec47e3d | 1860 | |
466d89a6 | 1861 | rq->special = tio; |
cec47e3d KU |
1862 | rq->cmd_flags |= REQ_DONTPREP; |
1863 | ||
1864 | return BLKPREP_OK; | |
1865 | } | |
1866 | ||
9eef87da KU |
1867 | /* |
1868 | * Returns: | |
e5863d9a MS |
1869 | * 0 : the request has been processed |
1870 | * DM_MAPIO_REQUEUE : the original request needs to be requeued | |
1871 | * < 0 : the request was completed due to failure | |
9eef87da | 1872 | */ |
bfebd1cd | 1873 | static int map_request(struct dm_rq_target_io *tio, struct request *rq, |
9eef87da | 1874 | struct mapped_device *md) |
cec47e3d | 1875 | { |
e5863d9a | 1876 | int r; |
bfebd1cd | 1877 | struct dm_target *ti = tio->ti; |
e5863d9a MS |
1878 | struct request *clone = NULL; |
1879 | ||
1880 | if (tio->clone) { | |
1881 | clone = tio->clone; | |
1882 | r = ti->type->map_rq(ti, clone, &tio->info); | |
1883 | } else { | |
1884 | r = ti->type->clone_and_map_rq(ti, rq, &tio->info, &clone); | |
1885 | if (r < 0) { | |
1886 | /* The target wants to complete the I/O */ | |
1887 | dm_kill_unmapped_request(rq, r); | |
1888 | return r; | |
1889 | } | |
1890 | if (IS_ERR(clone)) | |
1891 | return DM_MAPIO_REQUEUE; | |
5f1b670d | 1892 | setup_clone(clone, rq, tio); |
e5863d9a | 1893 | } |
cec47e3d | 1894 | |
cec47e3d KU |
1895 | switch (r) { |
1896 | case DM_MAPIO_SUBMITTED: | |
1897 | /* The target has taken the I/O to submit by itself later */ | |
1898 | break; | |
1899 | case DM_MAPIO_REMAPPED: | |
1900 | /* The target has remapped the I/O so dispatch it */ | |
6db4ccd6 | 1901 | trace_block_rq_remap(clone->q, clone, disk_devt(dm_disk(md)), |
466d89a6 KB |
1902 | blk_rq_pos(rq)); |
1903 | dm_dispatch_clone_request(clone, rq); | |
cec47e3d KU |
1904 | break; |
1905 | case DM_MAPIO_REQUEUE: | |
1906 | /* The target wants to requeue the I/O */ | |
1907 | dm_requeue_unmapped_request(clone); | |
1908 | break; | |
1909 | default: | |
1910 | if (r > 0) { | |
1911 | DMWARN("unimplemented target map return value: %d", r); | |
1912 | BUG(); | |
1913 | } | |
1914 | ||
1915 | /* The target wants to complete the I/O */ | |
466d89a6 | 1916 | dm_kill_unmapped_request(rq, r); |
e5863d9a | 1917 | return r; |
cec47e3d | 1918 | } |
9eef87da | 1919 | |
e5863d9a | 1920 | return 0; |
cec47e3d KU |
1921 | } |
1922 | ||
2eb6e1e3 | 1923 | static void map_tio_request(struct kthread_work *work) |
ba1cbad9 | 1924 | { |
2eb6e1e3 | 1925 | struct dm_rq_target_io *tio = container_of(work, struct dm_rq_target_io, work); |
e5863d9a MS |
1926 | struct request *rq = tio->orig; |
1927 | struct mapped_device *md = tio->md; | |
ba1cbad9 | 1928 | |
bfebd1cd | 1929 | if (map_request(tio, rq, md) == DM_MAPIO_REQUEUE) |
e5863d9a | 1930 | dm_requeue_unmapped_original_request(md, rq); |
2eb6e1e3 KB |
1931 | } |
1932 | ||
466d89a6 | 1933 | static void dm_start_request(struct mapped_device *md, struct request *orig) |
ba1cbad9 | 1934 | { |
bfebd1cd MS |
1935 | if (!orig->q->mq_ops) |
1936 | blk_start_request(orig); | |
1937 | else | |
1938 | blk_mq_start_request(orig); | |
466d89a6 | 1939 | atomic_inc(&md->pending[rq_data_dir(orig)]); |
ba1cbad9 | 1940 | |
0ce65797 MS |
1941 | if (md->seq_rq_merge_deadline_usecs) { |
1942 | md->last_rq_pos = rq_end_sector(orig); | |
1943 | md->last_rq_rw = rq_data_dir(orig); | |
1944 | md->last_rq_start_time = ktime_get(); | |
1945 | } | |
de3ec86d | 1946 | |
ba1cbad9 MS |
1947 | /* |
1948 | * Hold the md reference here for the in-flight I/O. | |
1949 | * We can't rely on the reference count by device opener, | |
1950 | * because the device may be closed during the request completion | |
1951 | * when all bios are completed. | |
1952 | * See the comment in rq_completed() too. | |
1953 | */ | |
1954 | dm_get(md); | |
ba1cbad9 MS |
1955 | } |
1956 | ||
0ce65797 MS |
1957 | #define MAX_SEQ_RQ_MERGE_DEADLINE_USECS 100000 |
1958 | ||
1959 | ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf) | |
1960 | { | |
1961 | return sprintf(buf, "%u\n", md->seq_rq_merge_deadline_usecs); | |
1962 | } | |
1963 | ||
1964 | ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md, | |
1965 | const char *buf, size_t count) | |
1966 | { | |
1967 | unsigned deadline; | |
1968 | ||
17e149b8 | 1969 | if (!dm_request_based(md) || md->use_blk_mq) |
0ce65797 MS |
1970 | return count; |
1971 | ||
1972 | if (kstrtouint(buf, 10, &deadline)) | |
1973 | return -EINVAL; | |
1974 | ||
1975 | if (deadline > MAX_SEQ_RQ_MERGE_DEADLINE_USECS) | |
1976 | deadline = MAX_SEQ_RQ_MERGE_DEADLINE_USECS; | |
1977 | ||
1978 | md->seq_rq_merge_deadline_usecs = deadline; | |
1979 | ||
1980 | return count; | |
1981 | } | |
1982 | ||
1983 | static bool dm_request_peeked_before_merge_deadline(struct mapped_device *md) | |
1984 | { | |
1985 | ktime_t kt_deadline; | |
1986 | ||
1987 | if (!md->seq_rq_merge_deadline_usecs) | |
1988 | return false; | |
1989 | ||
1990 | kt_deadline = ns_to_ktime((u64)md->seq_rq_merge_deadline_usecs * NSEC_PER_USEC); | |
1991 | kt_deadline = ktime_add_safe(md->last_rq_start_time, kt_deadline); | |
1992 | ||
1993 | return !ktime_after(ktime_get(), kt_deadline); | |
1994 | } | |
1995 | ||
cec47e3d KU |
1996 | /* |
1997 | * q->request_fn for request-based dm. | |
1998 | * Called with the queue lock held. | |
1999 | */ | |
2000 | static void dm_request_fn(struct request_queue *q) | |
2001 | { | |
2002 | struct mapped_device *md = q->queuedata; | |
83d5e5b0 MP |
2003 | int srcu_idx; |
2004 | struct dm_table *map = dm_get_live_table(md, &srcu_idx); | |
cec47e3d | 2005 | struct dm_target *ti; |
466d89a6 | 2006 | struct request *rq; |
2eb6e1e3 | 2007 | struct dm_rq_target_io *tio; |
29e4013d | 2008 | sector_t pos; |
cec47e3d KU |
2009 | |
2010 | /* | |
b4324fee KU |
2011 | * For suspend, check blk_queue_stopped() and increment |
2012 | * ->pending within a single queue_lock not to increment the | |
2013 | * number of in-flight I/Os after the queue is stopped in | |
2014 | * dm_suspend(). | |
cec47e3d | 2015 | */ |
7eaceacc | 2016 | while (!blk_queue_stopped(q)) { |
cec47e3d KU |
2017 | rq = blk_peek_request(q); |
2018 | if (!rq) | |
9d1deb83 | 2019 | goto out; |
cec47e3d | 2020 | |
29e4013d TH |
2021 | /* always use block 0 to find the target for flushes for now */ |
2022 | pos = 0; | |
2023 | if (!(rq->cmd_flags & REQ_FLUSH)) | |
2024 | pos = blk_rq_pos(rq); | |
2025 | ||
2026 | ti = dm_table_find_target(map, pos); | |
ba1cbad9 MS |
2027 | if (!dm_target_is_valid(ti)) { |
2028 | /* | |
466d89a6 | 2029 | * Must perform setup, that rq_completed() requires, |
ba1cbad9 MS |
2030 | * before calling dm_kill_unmapped_request |
2031 | */ | |
2032 | DMERR_LIMIT("request attempted access beyond the end of device"); | |
466d89a6 KB |
2033 | dm_start_request(md, rq); |
2034 | dm_kill_unmapped_request(rq, -EIO); | |
ba1cbad9 MS |
2035 | continue; |
2036 | } | |
d0bcb878 | 2037 | |
0ce65797 MS |
2038 | if (dm_request_peeked_before_merge_deadline(md) && |
2039 | md_in_flight(md) && rq->bio && rq->bio->bi_vcnt == 1 && | |
de3ec86d MS |
2040 | md->last_rq_pos == pos && md->last_rq_rw == rq_data_dir(rq)) |
2041 | goto delay_and_out; | |
2042 | ||
cec47e3d | 2043 | if (ti->type->busy && ti->type->busy(ti)) |
7eaceacc | 2044 | goto delay_and_out; |
cec47e3d | 2045 | |
466d89a6 | 2046 | dm_start_request(md, rq); |
9eef87da | 2047 | |
bfebd1cd | 2048 | tio = tio_from_request(rq); |
2eb6e1e3 KB |
2049 | /* Establish tio->ti before queuing work (map_tio_request) */ |
2050 | tio->ti = ti; | |
2051 | queue_kthread_work(&md->kworker, &tio->work); | |
052189a2 | 2052 | BUG_ON(!irqs_disabled()); |
cec47e3d KU |
2053 | } |
2054 | ||
2055 | goto out; | |
2056 | ||
7eaceacc | 2057 | delay_and_out: |
d548b34b | 2058 | blk_delay_queue(q, HZ / 100); |
cec47e3d | 2059 | out: |
83d5e5b0 | 2060 | dm_put_live_table(md, srcu_idx); |
cec47e3d KU |
2061 | } |
2062 | ||
1da177e4 LT |
2063 | static int dm_any_congested(void *congested_data, int bdi_bits) |
2064 | { | |
8a57dfc6 CS |
2065 | int r = bdi_bits; |
2066 | struct mapped_device *md = congested_data; | |
2067 | struct dm_table *map; | |
1da177e4 | 2068 | |
1eb787ec | 2069 | if (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) { |
83d5e5b0 | 2070 | map = dm_get_live_table_fast(md); |
8a57dfc6 | 2071 | if (map) { |
cec47e3d KU |
2072 | /* |
2073 | * Request-based dm cares about only own queue for | |
2074 | * the query about congestion status of request_queue | |
2075 | */ | |
2076 | if (dm_request_based(md)) | |
2077 | r = md->queue->backing_dev_info.state & | |
2078 | bdi_bits; | |
2079 | else | |
2080 | r = dm_table_any_congested(map, bdi_bits); | |
8a57dfc6 | 2081 | } |
83d5e5b0 | 2082 | dm_put_live_table_fast(md); |
8a57dfc6 CS |
2083 | } |
2084 | ||
1da177e4 LT |
2085 | return r; |
2086 | } | |
2087 | ||
2088 | /*----------------------------------------------------------------- | |
2089 | * An IDR is used to keep track of allocated minor numbers. | |
2090 | *---------------------------------------------------------------*/ | |
2b06cfff | 2091 | static void free_minor(int minor) |
1da177e4 | 2092 | { |
f32c10b0 | 2093 | spin_lock(&_minor_lock); |
1da177e4 | 2094 | idr_remove(&_minor_idr, minor); |
f32c10b0 | 2095 | spin_unlock(&_minor_lock); |
1da177e4 LT |
2096 | } |
2097 | ||
2098 | /* | |
2099 | * See if the device with a specific minor # is free. | |
2100 | */ | |
cf13ab8e | 2101 | static int specific_minor(int minor) |
1da177e4 | 2102 | { |
c9d76be6 | 2103 | int r; |
1da177e4 LT |
2104 | |
2105 | if (minor >= (1 << MINORBITS)) | |
2106 | return -EINVAL; | |
2107 | ||
c9d76be6 | 2108 | idr_preload(GFP_KERNEL); |
f32c10b0 | 2109 | spin_lock(&_minor_lock); |
1da177e4 | 2110 | |
c9d76be6 | 2111 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, minor, minor + 1, GFP_NOWAIT); |
1da177e4 | 2112 | |
f32c10b0 | 2113 | spin_unlock(&_minor_lock); |
c9d76be6 TH |
2114 | idr_preload_end(); |
2115 | if (r < 0) | |
2116 | return r == -ENOSPC ? -EBUSY : r; | |
2117 | return 0; | |
1da177e4 LT |
2118 | } |
2119 | ||
cf13ab8e | 2120 | static int next_free_minor(int *minor) |
1da177e4 | 2121 | { |
c9d76be6 | 2122 | int r; |
62f75c2f | 2123 | |
c9d76be6 | 2124 | idr_preload(GFP_KERNEL); |
f32c10b0 | 2125 | spin_lock(&_minor_lock); |
1da177e4 | 2126 | |
c9d76be6 | 2127 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, 0, 1 << MINORBITS, GFP_NOWAIT); |
1da177e4 | 2128 | |
f32c10b0 | 2129 | spin_unlock(&_minor_lock); |
c9d76be6 TH |
2130 | idr_preload_end(); |
2131 | if (r < 0) | |
2132 | return r; | |
2133 | *minor = r; | |
2134 | return 0; | |
1da177e4 LT |
2135 | } |
2136 | ||
83d5cde4 | 2137 | static const struct block_device_operations dm_blk_dops; |
1da177e4 | 2138 | |
53d5914f MP |
2139 | static void dm_wq_work(struct work_struct *work); |
2140 | ||
4a0b4ddf MS |
2141 | static void dm_init_md_queue(struct mapped_device *md) |
2142 | { | |
2143 | /* | |
2144 | * Request-based dm devices cannot be stacked on top of bio-based dm | |
bfebd1cd | 2145 | * devices. The type of this dm device may not have been decided yet. |
4a0b4ddf MS |
2146 | * The type is decided at the first table loading time. |
2147 | * To prevent problematic device stacking, clear the queue flag | |
2148 | * for request stacking support until then. | |
2149 | * | |
2150 | * This queue is new, so no concurrency on the queue_flags. | |
2151 | */ | |
2152 | queue_flag_clear_unlocked(QUEUE_FLAG_STACKABLE, md->queue); | |
bfebd1cd | 2153 | } |
4a0b4ddf | 2154 | |
bfebd1cd MS |
2155 | static void dm_init_old_md_queue(struct mapped_device *md) |
2156 | { | |
17e149b8 | 2157 | md->use_blk_mq = false; |
bfebd1cd MS |
2158 | dm_init_md_queue(md); |
2159 | ||
2160 | /* | |
2161 | * Initialize aspects of queue that aren't relevant for blk-mq | |
2162 | */ | |
4a0b4ddf MS |
2163 | md->queue->queuedata = md; |
2164 | md->queue->backing_dev_info.congested_fn = dm_any_congested; | |
2165 | md->queue->backing_dev_info.congested_data = md; | |
ff36ab34 | 2166 | |
4a0b4ddf | 2167 | blk_queue_bounce_limit(md->queue, BLK_BOUNCE_ANY); |
4a0b4ddf MS |
2168 | } |
2169 | ||
1da177e4 LT |
2170 | /* |
2171 | * Allocate and initialise a blank device with a given minor. | |
2172 | */ | |
2b06cfff | 2173 | static struct mapped_device *alloc_dev(int minor) |
1da177e4 LT |
2174 | { |
2175 | int r; | |
cf13ab8e | 2176 | struct mapped_device *md = kzalloc(sizeof(*md), GFP_KERNEL); |
ba61fdd1 | 2177 | void *old_md; |
1da177e4 LT |
2178 | |
2179 | if (!md) { | |
2180 | DMWARN("unable to allocate device, out of memory."); | |
2181 | return NULL; | |
2182 | } | |
2183 | ||
10da4f79 | 2184 | if (!try_module_get(THIS_MODULE)) |
6ed7ade8 | 2185 | goto bad_module_get; |
10da4f79 | 2186 | |
1da177e4 | 2187 | /* get a minor number for the dev */ |
2b06cfff | 2188 | if (minor == DM_ANY_MINOR) |
cf13ab8e | 2189 | r = next_free_minor(&minor); |
2b06cfff | 2190 | else |
cf13ab8e | 2191 | r = specific_minor(minor); |
1da177e4 | 2192 | if (r < 0) |
6ed7ade8 | 2193 | goto bad_minor; |
1da177e4 | 2194 | |
83d5e5b0 MP |
2195 | r = init_srcu_struct(&md->io_barrier); |
2196 | if (r < 0) | |
2197 | goto bad_io_barrier; | |
2198 | ||
17e149b8 | 2199 | md->use_blk_mq = use_blk_mq; |
a5664dad | 2200 | md->type = DM_TYPE_NONE; |
e61290a4 | 2201 | mutex_init(&md->suspend_lock); |
a5664dad | 2202 | mutex_init(&md->type_lock); |
86f1152b | 2203 | mutex_init(&md->table_devices_lock); |
022c2611 | 2204 | spin_lock_init(&md->deferred_lock); |
1da177e4 | 2205 | atomic_set(&md->holders, 1); |
5c6bd75d | 2206 | atomic_set(&md->open_count, 0); |
1da177e4 | 2207 | atomic_set(&md->event_nr, 0); |
7a8c3d3b MA |
2208 | atomic_set(&md->uevent_seq, 0); |
2209 | INIT_LIST_HEAD(&md->uevent_list); | |
86f1152b | 2210 | INIT_LIST_HEAD(&md->table_devices); |
7a8c3d3b | 2211 | spin_lock_init(&md->uevent_lock); |
1da177e4 | 2212 | |
4a0b4ddf | 2213 | md->queue = blk_alloc_queue(GFP_KERNEL); |
1da177e4 | 2214 | if (!md->queue) |
6ed7ade8 | 2215 | goto bad_queue; |
1da177e4 | 2216 | |
4a0b4ddf | 2217 | dm_init_md_queue(md); |
9faf400f | 2218 | |
1da177e4 LT |
2219 | md->disk = alloc_disk(1); |
2220 | if (!md->disk) | |
6ed7ade8 | 2221 | goto bad_disk; |
1da177e4 | 2222 | |
316d315b NK |
2223 | atomic_set(&md->pending[0], 0); |
2224 | atomic_set(&md->pending[1], 0); | |
f0b04115 | 2225 | init_waitqueue_head(&md->wait); |
53d5914f | 2226 | INIT_WORK(&md->work, dm_wq_work); |
f0b04115 | 2227 | init_waitqueue_head(&md->eventq); |
2995fa78 | 2228 | init_completion(&md->kobj_holder.completion); |
2eb6e1e3 | 2229 | md->kworker_task = NULL; |
f0b04115 | 2230 | |
1da177e4 LT |
2231 | md->disk->major = _major; |
2232 | md->disk->first_minor = minor; | |
2233 | md->disk->fops = &dm_blk_dops; | |
2234 | md->disk->queue = md->queue; | |
2235 | md->disk->private_data = md; | |
2236 | sprintf(md->disk->disk_name, "dm-%d", minor); | |
2237 | add_disk(md->disk); | |
7e51f257 | 2238 | format_dev_t(md->name, MKDEV(_major, minor)); |
1da177e4 | 2239 | |
670368a8 | 2240 | md->wq = alloc_workqueue("kdmflush", WQ_MEM_RECLAIM, 0); |
304f3f6a MB |
2241 | if (!md->wq) |
2242 | goto bad_thread; | |
2243 | ||
32a926da MP |
2244 | md->bdev = bdget_disk(md->disk, 0); |
2245 | if (!md->bdev) | |
2246 | goto bad_bdev; | |
2247 | ||
6a8736d1 TH |
2248 | bio_init(&md->flush_bio); |
2249 | md->flush_bio.bi_bdev = md->bdev; | |
2250 | md->flush_bio.bi_rw = WRITE_FLUSH; | |
2251 | ||
fd2ed4d2 MP |
2252 | dm_stats_init(&md->stats); |
2253 | ||
ba61fdd1 | 2254 | /* Populate the mapping, nobody knows we exist yet */ |
f32c10b0 | 2255 | spin_lock(&_minor_lock); |
ba61fdd1 | 2256 | old_md = idr_replace(&_minor_idr, md, minor); |
f32c10b0 | 2257 | spin_unlock(&_minor_lock); |
ba61fdd1 JM |
2258 | |
2259 | BUG_ON(old_md != MINOR_ALLOCED); | |
2260 | ||
1da177e4 LT |
2261 | return md; |
2262 | ||
32a926da MP |
2263 | bad_bdev: |
2264 | destroy_workqueue(md->wq); | |
304f3f6a | 2265 | bad_thread: |
03022c54 | 2266 | del_gendisk(md->disk); |
304f3f6a | 2267 | put_disk(md->disk); |
6ed7ade8 | 2268 | bad_disk: |
1312f40e | 2269 | blk_cleanup_queue(md->queue); |
6ed7ade8 | 2270 | bad_queue: |
83d5e5b0 MP |
2271 | cleanup_srcu_struct(&md->io_barrier); |
2272 | bad_io_barrier: | |
1da177e4 | 2273 | free_minor(minor); |
6ed7ade8 | 2274 | bad_minor: |
10da4f79 | 2275 | module_put(THIS_MODULE); |
6ed7ade8 | 2276 | bad_module_get: |
1da177e4 LT |
2277 | kfree(md); |
2278 | return NULL; | |
2279 | } | |
2280 | ||
ae9da83f JN |
2281 | static void unlock_fs(struct mapped_device *md); |
2282 | ||
1da177e4 LT |
2283 | static void free_dev(struct mapped_device *md) |
2284 | { | |
f331c029 | 2285 | int minor = MINOR(disk_devt(md->disk)); |
63d94e48 | 2286 | |
32a926da | 2287 | unlock_fs(md); |
304f3f6a | 2288 | destroy_workqueue(md->wq); |
2eb6e1e3 KB |
2289 | |
2290 | if (md->kworker_task) | |
2291 | kthread_stop(md->kworker_task); | |
e6ee8c0b KU |
2292 | if (md->io_pool) |
2293 | mempool_destroy(md->io_pool); | |
1ae49ea2 MS |
2294 | if (md->rq_pool) |
2295 | mempool_destroy(md->rq_pool); | |
e6ee8c0b KU |
2296 | if (md->bs) |
2297 | bioset_free(md->bs); | |
63a4f065 | 2298 | |
83d5e5b0 | 2299 | cleanup_srcu_struct(&md->io_barrier); |
86f1152b | 2300 | free_table_devices(&md->table_devices); |
63a4f065 | 2301 | dm_stats_cleanup(&md->stats); |
fba9f90e JM |
2302 | |
2303 | spin_lock(&_minor_lock); | |
2304 | md->disk->private_data = NULL; | |
2305 | spin_unlock(&_minor_lock); | |
63a4f065 MS |
2306 | if (blk_get_integrity(md->disk)) |
2307 | blk_integrity_unregister(md->disk); | |
2308 | del_gendisk(md->disk); | |
1da177e4 | 2309 | put_disk(md->disk); |
1312f40e | 2310 | blk_cleanup_queue(md->queue); |
17e149b8 | 2311 | if (md->use_blk_mq) |
bfebd1cd | 2312 | blk_mq_free_tag_set(&md->tag_set); |
63a4f065 MS |
2313 | bdput(md->bdev); |
2314 | free_minor(minor); | |
2315 | ||
10da4f79 | 2316 | module_put(THIS_MODULE); |
1da177e4 LT |
2317 | kfree(md); |
2318 | } | |
2319 | ||
e6ee8c0b KU |
2320 | static void __bind_mempools(struct mapped_device *md, struct dm_table *t) |
2321 | { | |
c0820cf5 | 2322 | struct dm_md_mempools *p = dm_table_get_md_mempools(t); |
e6ee8c0b | 2323 | |
17e149b8 | 2324 | if (md->bs) { |
16245bdc JN |
2325 | /* The md already has necessary mempools. */ |
2326 | if (dm_table_get_type(t) == DM_TYPE_BIO_BASED) { | |
2327 | /* | |
2328 | * Reload bioset because front_pad may have changed | |
2329 | * because a different table was loaded. | |
2330 | */ | |
2331 | bioset_free(md->bs); | |
2332 | md->bs = p->bs; | |
2333 | p->bs = NULL; | |
16245bdc | 2334 | } |
466d89a6 KB |
2335 | /* |
2336 | * There's no need to reload with request-based dm | |
2337 | * because the size of front_pad doesn't change. | |
2338 | * Note for future: If you are to reload bioset, | |
2339 | * prep-ed requests in the queue may refer | |
2340 | * to bio from the old bioset, so you must walk | |
2341 | * through the queue to unprep. | |
2342 | */ | |
e6ee8c0b | 2343 | goto out; |
c0820cf5 | 2344 | } |
e6ee8c0b | 2345 | |
e6ee8c0b KU |
2346 | md->io_pool = p->io_pool; |
2347 | p->io_pool = NULL; | |
1ae49ea2 MS |
2348 | md->rq_pool = p->rq_pool; |
2349 | p->rq_pool = NULL; | |
e6ee8c0b KU |
2350 | md->bs = p->bs; |
2351 | p->bs = NULL; | |
2352 | ||
2353 | out: | |
02233342 | 2354 | /* mempool bind completed, no longer need any mempools in the table */ |
e6ee8c0b KU |
2355 | dm_table_free_md_mempools(t); |
2356 | } | |
2357 | ||
1da177e4 LT |
2358 | /* |
2359 | * Bind a table to the device. | |
2360 | */ | |
2361 | static void event_callback(void *context) | |
2362 | { | |
7a8c3d3b MA |
2363 | unsigned long flags; |
2364 | LIST_HEAD(uevents); | |
1da177e4 LT |
2365 | struct mapped_device *md = (struct mapped_device *) context; |
2366 | ||
7a8c3d3b MA |
2367 | spin_lock_irqsave(&md->uevent_lock, flags); |
2368 | list_splice_init(&md->uevent_list, &uevents); | |
2369 | spin_unlock_irqrestore(&md->uevent_lock, flags); | |
2370 | ||
ed9e1982 | 2371 | dm_send_uevents(&uevents, &disk_to_dev(md->disk)->kobj); |
7a8c3d3b | 2372 | |
1da177e4 LT |
2373 | atomic_inc(&md->event_nr); |
2374 | wake_up(&md->eventq); | |
2375 | } | |
2376 | ||
c217649b MS |
2377 | /* |
2378 | * Protected by md->suspend_lock obtained by dm_swap_table(). | |
2379 | */ | |
4e90188b | 2380 | static void __set_size(struct mapped_device *md, sector_t size) |
1da177e4 | 2381 | { |
4e90188b | 2382 | set_capacity(md->disk, size); |
1da177e4 | 2383 | |
db8fef4f | 2384 | i_size_write(md->bdev->bd_inode, (loff_t)size << SECTOR_SHIFT); |
1da177e4 LT |
2385 | } |
2386 | ||
d5b9dd04 MP |
2387 | /* |
2388 | * Return 1 if the queue has a compulsory merge_bvec_fn function. | |
2389 | * | |
2390 | * If this function returns 0, then the device is either a non-dm | |
2391 | * device without a merge_bvec_fn, or it is a dm device that is | |
2392 | * able to split any bios it receives that are too big. | |
2393 | */ | |
2394 | int dm_queue_merge_is_compulsory(struct request_queue *q) | |
2395 | { | |
2396 | struct mapped_device *dev_md; | |
2397 | ||
2398 | if (!q->merge_bvec_fn) | |
2399 | return 0; | |
2400 | ||
ff36ab34 | 2401 | if (q->make_request_fn == dm_make_request) { |
d5b9dd04 MP |
2402 | dev_md = q->queuedata; |
2403 | if (test_bit(DMF_MERGE_IS_OPTIONAL, &dev_md->flags)) | |
2404 | return 0; | |
2405 | } | |
2406 | ||
2407 | return 1; | |
2408 | } | |
2409 | ||
2410 | static int dm_device_merge_is_compulsory(struct dm_target *ti, | |
2411 | struct dm_dev *dev, sector_t start, | |
2412 | sector_t len, void *data) | |
2413 | { | |
2414 | struct block_device *bdev = dev->bdev; | |
2415 | struct request_queue *q = bdev_get_queue(bdev); | |
2416 | ||
2417 | return dm_queue_merge_is_compulsory(q); | |
2418 | } | |
2419 | ||
2420 | /* | |
2421 | * Return 1 if it is acceptable to ignore merge_bvec_fn based | |
2422 | * on the properties of the underlying devices. | |
2423 | */ | |
2424 | static int dm_table_merge_is_optional(struct dm_table *table) | |
2425 | { | |
2426 | unsigned i = 0; | |
2427 | struct dm_target *ti; | |
2428 | ||
2429 | while (i < dm_table_get_num_targets(table)) { | |
2430 | ti = dm_table_get_target(table, i++); | |
2431 | ||
2432 | if (ti->type->iterate_devices && | |
2433 | ti->type->iterate_devices(ti, dm_device_merge_is_compulsory, NULL)) | |
2434 | return 0; | |
2435 | } | |
2436 | ||
2437 | return 1; | |
2438 | } | |
2439 | ||
042d2a9b AK |
2440 | /* |
2441 | * Returns old map, which caller must destroy. | |
2442 | */ | |
2443 | static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, | |
2444 | struct queue_limits *limits) | |
1da177e4 | 2445 | { |
042d2a9b | 2446 | struct dm_table *old_map; |
165125e1 | 2447 | struct request_queue *q = md->queue; |
1da177e4 | 2448 | sector_t size; |
d5b9dd04 | 2449 | int merge_is_optional; |
1da177e4 LT |
2450 | |
2451 | size = dm_table_get_size(t); | |
3ac51e74 DW |
2452 | |
2453 | /* | |
2454 | * Wipe any geometry if the size of the table changed. | |
2455 | */ | |
fd2ed4d2 | 2456 | if (size != dm_get_size(md)) |
3ac51e74 DW |
2457 | memset(&md->geometry, 0, sizeof(md->geometry)); |
2458 | ||
32a926da | 2459 | __set_size(md, size); |
d5816876 | 2460 | |
2ca3310e AK |
2461 | dm_table_event_callback(t, event_callback, md); |
2462 | ||
e6ee8c0b KU |
2463 | /* |
2464 | * The queue hasn't been stopped yet, if the old table type wasn't | |
2465 | * for request-based during suspension. So stop it to prevent | |
2466 | * I/O mapping before resume. | |
2467 | * This must be done before setting the queue restrictions, | |
2468 | * because request-based dm may be run just after the setting. | |
2469 | */ | |
bfebd1cd | 2470 | if (dm_table_request_based(t)) |
e6ee8c0b KU |
2471 | stop_queue(q); |
2472 | ||
2473 | __bind_mempools(md, t); | |
2474 | ||
d5b9dd04 MP |
2475 | merge_is_optional = dm_table_merge_is_optional(t); |
2476 | ||
a12f5d48 | 2477 | old_map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
83d5e5b0 | 2478 | rcu_assign_pointer(md->map, t); |
36a0456f AK |
2479 | md->immutable_target_type = dm_table_get_immutable_target_type(t); |
2480 | ||
754c5fc7 | 2481 | dm_table_set_restrictions(t, q, limits); |
d5b9dd04 MP |
2482 | if (merge_is_optional) |
2483 | set_bit(DMF_MERGE_IS_OPTIONAL, &md->flags); | |
2484 | else | |
2485 | clear_bit(DMF_MERGE_IS_OPTIONAL, &md->flags); | |
41abc4e1 HR |
2486 | if (old_map) |
2487 | dm_sync_table(md); | |
1da177e4 | 2488 | |
042d2a9b | 2489 | return old_map; |
1da177e4 LT |
2490 | } |
2491 | ||
a7940155 AK |
2492 | /* |
2493 | * Returns unbound table for the caller to free. | |
2494 | */ | |
2495 | static struct dm_table *__unbind(struct mapped_device *md) | |
1da177e4 | 2496 | { |
a12f5d48 | 2497 | struct dm_table *map = rcu_dereference_protected(md->map, 1); |
1da177e4 LT |
2498 | |
2499 | if (!map) | |
a7940155 | 2500 | return NULL; |
1da177e4 LT |
2501 | |
2502 | dm_table_event_callback(map, NULL, NULL); | |
9cdb8520 | 2503 | RCU_INIT_POINTER(md->map, NULL); |
83d5e5b0 | 2504 | dm_sync_table(md); |
a7940155 AK |
2505 | |
2506 | return map; | |
1da177e4 LT |
2507 | } |
2508 | ||
2509 | /* | |
2510 | * Constructor for a new device. | |
2511 | */ | |
2b06cfff | 2512 | int dm_create(int minor, struct mapped_device **result) |
1da177e4 LT |
2513 | { |
2514 | struct mapped_device *md; | |
2515 | ||
2b06cfff | 2516 | md = alloc_dev(minor); |
1da177e4 LT |
2517 | if (!md) |
2518 | return -ENXIO; | |
2519 | ||
784aae73 MB |
2520 | dm_sysfs_init(md); |
2521 | ||
1da177e4 LT |
2522 | *result = md; |
2523 | return 0; | |
2524 | } | |
2525 | ||
a5664dad MS |
2526 | /* |
2527 | * Functions to manage md->type. | |
2528 | * All are required to hold md->type_lock. | |
2529 | */ | |
2530 | void dm_lock_md_type(struct mapped_device *md) | |
2531 | { | |
2532 | mutex_lock(&md->type_lock); | |
2533 | } | |
2534 | ||
2535 | void dm_unlock_md_type(struct mapped_device *md) | |
2536 | { | |
2537 | mutex_unlock(&md->type_lock); | |
2538 | } | |
2539 | ||
2540 | void dm_set_md_type(struct mapped_device *md, unsigned type) | |
2541 | { | |
00c4fc3b | 2542 | BUG_ON(!mutex_is_locked(&md->type_lock)); |
a5664dad MS |
2543 | md->type = type; |
2544 | } | |
2545 | ||
2546 | unsigned dm_get_md_type(struct mapped_device *md) | |
2547 | { | |
00c4fc3b | 2548 | BUG_ON(!mutex_is_locked(&md->type_lock)); |
a5664dad MS |
2549 | return md->type; |
2550 | } | |
2551 | ||
36a0456f AK |
2552 | struct target_type *dm_get_immutable_target_type(struct mapped_device *md) |
2553 | { | |
2554 | return md->immutable_target_type; | |
2555 | } | |
2556 | ||
f84cb8a4 MS |
2557 | /* |
2558 | * The queue_limits are only valid as long as you have a reference | |
2559 | * count on 'md'. | |
2560 | */ | |
2561 | struct queue_limits *dm_get_queue_limits(struct mapped_device *md) | |
2562 | { | |
2563 | BUG_ON(!atomic_read(&md->holders)); | |
2564 | return &md->queue->limits; | |
2565 | } | |
2566 | EXPORT_SYMBOL_GPL(dm_get_queue_limits); | |
2567 | ||
bfebd1cd MS |
2568 | static void init_rq_based_worker_thread(struct mapped_device *md) |
2569 | { | |
2570 | /* Initialize the request-based DM worker thread */ | |
2571 | init_kthread_worker(&md->kworker); | |
2572 | md->kworker_task = kthread_run(kthread_worker_fn, &md->kworker, | |
2573 | "kdmwork-%s", dm_device_name(md)); | |
2574 | } | |
2575 | ||
4a0b4ddf MS |
2576 | /* |
2577 | * Fully initialize a request-based queue (->elevator, ->request_fn, etc). | |
2578 | */ | |
2579 | static int dm_init_request_based_queue(struct mapped_device *md) | |
2580 | { | |
2581 | struct request_queue *q = NULL; | |
2582 | ||
4a0b4ddf MS |
2583 | /* Fully initialize the queue */ |
2584 | q = blk_init_allocated_queue(md->queue, dm_request_fn, NULL); | |
2585 | if (!q) | |
bfebd1cd | 2586 | return -EINVAL; |
4a0b4ddf | 2587 | |
0ce65797 MS |
2588 | /* disable dm_request_fn's merge heuristic by default */ |
2589 | md->seq_rq_merge_deadline_usecs = 0; | |
2590 | ||
4a0b4ddf | 2591 | md->queue = q; |
bfebd1cd | 2592 | dm_init_old_md_queue(md); |
4a0b4ddf MS |
2593 | blk_queue_softirq_done(md->queue, dm_softirq_done); |
2594 | blk_queue_prep_rq(md->queue, dm_prep_fn); | |
4a0b4ddf | 2595 | |
bfebd1cd | 2596 | init_rq_based_worker_thread(md); |
2eb6e1e3 | 2597 | |
4a0b4ddf MS |
2598 | elv_register_queue(md->queue); |
2599 | ||
bfebd1cd MS |
2600 | return 0; |
2601 | } | |
2602 | ||
2603 | static int dm_mq_init_request(void *data, struct request *rq, | |
2604 | unsigned int hctx_idx, unsigned int request_idx, | |
2605 | unsigned int numa_node) | |
2606 | { | |
2607 | struct mapped_device *md = data; | |
2608 | struct dm_rq_target_io *tio = blk_mq_rq_to_pdu(rq); | |
2609 | ||
2610 | /* | |
2611 | * Must initialize md member of tio, otherwise it won't | |
2612 | * be available in dm_mq_queue_rq. | |
2613 | */ | |
2614 | tio->md = md; | |
2615 | ||
2616 | return 0; | |
2617 | } | |
2618 | ||
2619 | static int dm_mq_queue_rq(struct blk_mq_hw_ctx *hctx, | |
2620 | const struct blk_mq_queue_data *bd) | |
2621 | { | |
2622 | struct request *rq = bd->rq; | |
2623 | struct dm_rq_target_io *tio = blk_mq_rq_to_pdu(rq); | |
2624 | struct mapped_device *md = tio->md; | |
2625 | int srcu_idx; | |
2626 | struct dm_table *map = dm_get_live_table(md, &srcu_idx); | |
2627 | struct dm_target *ti; | |
2628 | sector_t pos; | |
2629 | ||
2630 | /* always use block 0 to find the target for flushes for now */ | |
2631 | pos = 0; | |
2632 | if (!(rq->cmd_flags & REQ_FLUSH)) | |
2633 | pos = blk_rq_pos(rq); | |
2634 | ||
2635 | ti = dm_table_find_target(map, pos); | |
2636 | if (!dm_target_is_valid(ti)) { | |
2637 | dm_put_live_table(md, srcu_idx); | |
2638 | DMERR_LIMIT("request attempted access beyond the end of device"); | |
2639 | /* | |
2640 | * Must perform setup, that rq_completed() requires, | |
2641 | * before returning BLK_MQ_RQ_QUEUE_ERROR | |
2642 | */ | |
2643 | dm_start_request(md, rq); | |
2644 | return BLK_MQ_RQ_QUEUE_ERROR; | |
2645 | } | |
2646 | dm_put_live_table(md, srcu_idx); | |
2647 | ||
2648 | if (ti->type->busy && ti->type->busy(ti)) | |
2649 | return BLK_MQ_RQ_QUEUE_BUSY; | |
2650 | ||
2651 | dm_start_request(md, rq); | |
2652 | ||
2653 | /* Init tio using md established in .init_request */ | |
2654 | init_tio(tio, rq, md); | |
2655 | ||
02233342 MS |
2656 | /* |
2657 | * Establish tio->ti before queuing work (map_tio_request) | |
2658 | * or making direct call to map_request(). | |
2659 | */ | |
bfebd1cd | 2660 | tio->ti = ti; |
02233342 MS |
2661 | |
2662 | /* Clone the request if underlying devices aren't blk-mq */ | |
2663 | if (dm_table_get_type(map) == DM_TYPE_REQUEST_BASED) { | |
2664 | /* clone request is allocated at the end of the pdu */ | |
2665 | tio->clone = (void *)blk_mq_rq_to_pdu(rq) + sizeof(struct dm_rq_target_io); | |
2666 | if (!clone_rq(rq, md, tio, GFP_ATOMIC)) | |
2667 | return BLK_MQ_RQ_QUEUE_BUSY; | |
2668 | queue_kthread_work(&md->kworker, &tio->work); | |
2669 | } else { | |
2670 | /* Direct call is fine since .queue_rq allows allocations */ | |
2671 | if (map_request(tio, rq, md) == DM_MAPIO_REQUEUE) | |
2672 | dm_requeue_unmapped_original_request(md, rq); | |
2673 | } | |
bfebd1cd MS |
2674 | |
2675 | return BLK_MQ_RQ_QUEUE_OK; | |
2676 | } | |
2677 | ||
2678 | static struct blk_mq_ops dm_mq_ops = { | |
2679 | .queue_rq = dm_mq_queue_rq, | |
2680 | .map_queue = blk_mq_map_queue, | |
2681 | .complete = dm_softirq_done, | |
2682 | .init_request = dm_mq_init_request, | |
2683 | }; | |
2684 | ||
2685 | static int dm_init_request_based_blk_mq_queue(struct mapped_device *md) | |
2686 | { | |
02233342 | 2687 | unsigned md_type = dm_get_md_type(md); |
bfebd1cd MS |
2688 | struct request_queue *q; |
2689 | int err; | |
2690 | ||
2691 | memset(&md->tag_set, 0, sizeof(md->tag_set)); | |
2692 | md->tag_set.ops = &dm_mq_ops; | |
2693 | md->tag_set.queue_depth = BLKDEV_MAX_RQ; | |
2694 | md->tag_set.numa_node = NUMA_NO_NODE; | |
2695 | md->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE; | |
2696 | md->tag_set.nr_hw_queues = 1; | |
02233342 MS |
2697 | if (md_type == DM_TYPE_REQUEST_BASED) { |
2698 | /* make the memory for non-blk-mq clone part of the pdu */ | |
2699 | md->tag_set.cmd_size = sizeof(struct dm_rq_target_io) + sizeof(struct request); | |
2700 | } else | |
2701 | md->tag_set.cmd_size = sizeof(struct dm_rq_target_io); | |
bfebd1cd MS |
2702 | md->tag_set.driver_data = md; |
2703 | ||
2704 | err = blk_mq_alloc_tag_set(&md->tag_set); | |
2705 | if (err) | |
2706 | return err; | |
2707 | ||
2708 | q = blk_mq_init_allocated_queue(&md->tag_set, md->queue); | |
2709 | if (IS_ERR(q)) { | |
2710 | err = PTR_ERR(q); | |
2711 | goto out_tag_set; | |
2712 | } | |
2713 | md->queue = q; | |
2714 | dm_init_md_queue(md); | |
2715 | ||
2716 | /* backfill 'mq' sysfs registration normally done in blk_register_queue */ | |
2717 | blk_mq_register_disk(md->disk); | |
2718 | ||
02233342 MS |
2719 | if (md_type == DM_TYPE_REQUEST_BASED) |
2720 | init_rq_based_worker_thread(md); | |
bfebd1cd MS |
2721 | |
2722 | return 0; | |
2723 | ||
2724 | out_tag_set: | |
2725 | blk_mq_free_tag_set(&md->tag_set); | |
2726 | return err; | |
4a0b4ddf MS |
2727 | } |
2728 | ||
17e149b8 MS |
2729 | static unsigned filter_md_type(unsigned type, struct mapped_device *md) |
2730 | { | |
2731 | if (type == DM_TYPE_BIO_BASED) | |
2732 | return type; | |
2733 | ||
2734 | return !md->use_blk_mq ? DM_TYPE_REQUEST_BASED : DM_TYPE_MQ_REQUEST_BASED; | |
2735 | } | |
2736 | ||
4a0b4ddf MS |
2737 | /* |
2738 | * Setup the DM device's queue based on md's type | |
2739 | */ | |
2740 | int dm_setup_md_queue(struct mapped_device *md) | |
2741 | { | |
bfebd1cd | 2742 | int r; |
17e149b8 | 2743 | unsigned md_type = filter_md_type(dm_get_md_type(md), md); |
bfebd1cd MS |
2744 | |
2745 | switch (md_type) { | |
2746 | case DM_TYPE_REQUEST_BASED: | |
2747 | r = dm_init_request_based_queue(md); | |
2748 | if (r) { | |
ff36ab34 | 2749 | DMWARN("Cannot initialize queue for request-based mapped device"); |
bfebd1cd | 2750 | return r; |
ff36ab34 | 2751 | } |
bfebd1cd MS |
2752 | break; |
2753 | case DM_TYPE_MQ_REQUEST_BASED: | |
2754 | r = dm_init_request_based_blk_mq_queue(md); | |
2755 | if (r) { | |
2756 | DMWARN("Cannot initialize queue for request-based blk-mq mapped device"); | |
2757 | return r; | |
2758 | } | |
2759 | break; | |
2760 | case DM_TYPE_BIO_BASED: | |
2761 | dm_init_old_md_queue(md); | |
ff36ab34 MS |
2762 | blk_queue_make_request(md->queue, dm_make_request); |
2763 | blk_queue_merge_bvec(md->queue, dm_merge_bvec); | |
bfebd1cd | 2764 | break; |
4a0b4ddf MS |
2765 | } |
2766 | ||
2767 | return 0; | |
2768 | } | |
2769 | ||
2bec1f4a | 2770 | struct mapped_device *dm_get_md(dev_t dev) |
1da177e4 LT |
2771 | { |
2772 | struct mapped_device *md; | |
1da177e4 LT |
2773 | unsigned minor = MINOR(dev); |
2774 | ||
2775 | if (MAJOR(dev) != _major || minor >= (1 << MINORBITS)) | |
2776 | return NULL; | |
2777 | ||
f32c10b0 | 2778 | spin_lock(&_minor_lock); |
1da177e4 LT |
2779 | |
2780 | md = idr_find(&_minor_idr, minor); | |
2bec1f4a MP |
2781 | if (md) { |
2782 | if ((md == MINOR_ALLOCED || | |
2783 | (MINOR(disk_devt(dm_disk(md))) != minor) || | |
2784 | dm_deleting_md(md) || | |
2785 | test_bit(DMF_FREEING, &md->flags))) { | |
2786 | md = NULL; | |
2787 | goto out; | |
2788 | } | |
2789 | dm_get(md); | |
fba9f90e | 2790 | } |
1da177e4 | 2791 | |
fba9f90e | 2792 | out: |
f32c10b0 | 2793 | spin_unlock(&_minor_lock); |
1da177e4 | 2794 | |
637842cf DT |
2795 | return md; |
2796 | } | |
3cf2e4ba | 2797 | EXPORT_SYMBOL_GPL(dm_get_md); |
d229a958 | 2798 | |
9ade92a9 | 2799 | void *dm_get_mdptr(struct mapped_device *md) |
637842cf | 2800 | { |
9ade92a9 | 2801 | return md->interface_ptr; |
1da177e4 LT |
2802 | } |
2803 | ||
2804 | void dm_set_mdptr(struct mapped_device *md, void *ptr) | |
2805 | { | |
2806 | md->interface_ptr = ptr; | |
2807 | } | |
2808 | ||
2809 | void dm_get(struct mapped_device *md) | |
2810 | { | |
2811 | atomic_inc(&md->holders); | |
3f77316d | 2812 | BUG_ON(test_bit(DMF_FREEING, &md->flags)); |
1da177e4 LT |
2813 | } |
2814 | ||
09ee96b2 MP |
2815 | int dm_hold(struct mapped_device *md) |
2816 | { | |
2817 | spin_lock(&_minor_lock); | |
2818 | if (test_bit(DMF_FREEING, &md->flags)) { | |
2819 | spin_unlock(&_minor_lock); | |
2820 | return -EBUSY; | |
2821 | } | |
2822 | dm_get(md); | |
2823 | spin_unlock(&_minor_lock); | |
2824 | return 0; | |
2825 | } | |
2826 | EXPORT_SYMBOL_GPL(dm_hold); | |
2827 | ||
72d94861 AK |
2828 | const char *dm_device_name(struct mapped_device *md) |
2829 | { | |
2830 | return md->name; | |
2831 | } | |
2832 | EXPORT_SYMBOL_GPL(dm_device_name); | |
2833 | ||
3f77316d | 2834 | static void __dm_destroy(struct mapped_device *md, bool wait) |
1da177e4 | 2835 | { |
1134e5ae | 2836 | struct dm_table *map; |
83d5e5b0 | 2837 | int srcu_idx; |
1da177e4 | 2838 | |
3f77316d | 2839 | might_sleep(); |
fba9f90e | 2840 | |
83d5e5b0 | 2841 | map = dm_get_live_table(md, &srcu_idx); |
63a4f065 MS |
2842 | |
2843 | spin_lock(&_minor_lock); | |
3f77316d KU |
2844 | idr_replace(&_minor_idr, MINOR_ALLOCED, MINOR(disk_devt(dm_disk(md)))); |
2845 | set_bit(DMF_FREEING, &md->flags); | |
2846 | spin_unlock(&_minor_lock); | |
2847 | ||
02233342 | 2848 | if (dm_request_based(md) && md->kworker_task) |
2eb6e1e3 KB |
2849 | flush_kthread_worker(&md->kworker); |
2850 | ||
ab7c7bb6 MP |
2851 | /* |
2852 | * Take suspend_lock so that presuspend and postsuspend methods | |
2853 | * do not race with internal suspend. | |
2854 | */ | |
2855 | mutex_lock(&md->suspend_lock); | |
3f77316d KU |
2856 | if (!dm_suspended_md(md)) { |
2857 | dm_table_presuspend_targets(map); | |
2858 | dm_table_postsuspend_targets(map); | |
1da177e4 | 2859 | } |
ab7c7bb6 | 2860 | mutex_unlock(&md->suspend_lock); |
3f77316d | 2861 | |
83d5e5b0 MP |
2862 | /* dm_put_live_table must be before msleep, otherwise deadlock is possible */ |
2863 | dm_put_live_table(md, srcu_idx); | |
2864 | ||
3f77316d KU |
2865 | /* |
2866 | * Rare, but there may be I/O requests still going to complete, | |
2867 | * for example. Wait for all references to disappear. | |
2868 | * No one should increment the reference count of the mapped_device, | |
2869 | * after the mapped_device state becomes DMF_FREEING. | |
2870 | */ | |
2871 | if (wait) | |
2872 | while (atomic_read(&md->holders)) | |
2873 | msleep(1); | |
2874 | else if (atomic_read(&md->holders)) | |
2875 | DMWARN("%s: Forcibly removing mapped_device still in use! (%d users)", | |
2876 | dm_device_name(md), atomic_read(&md->holders)); | |
2877 | ||
2878 | dm_sysfs_exit(md); | |
3f77316d KU |
2879 | dm_table_destroy(__unbind(md)); |
2880 | free_dev(md); | |
2881 | } | |
2882 | ||
2883 | void dm_destroy(struct mapped_device *md) | |
2884 | { | |
2885 | __dm_destroy(md, true); | |
2886 | } | |
2887 | ||
2888 | void dm_destroy_immediate(struct mapped_device *md) | |
2889 | { | |
2890 | __dm_destroy(md, false); | |
2891 | } | |
2892 | ||
2893 | void dm_put(struct mapped_device *md) | |
2894 | { | |
2895 | atomic_dec(&md->holders); | |
1da177e4 | 2896 | } |
79eb885c | 2897 | EXPORT_SYMBOL_GPL(dm_put); |
1da177e4 | 2898 | |
401600df | 2899 | static int dm_wait_for_completion(struct mapped_device *md, int interruptible) |
46125c1c MB |
2900 | { |
2901 | int r = 0; | |
b44ebeb0 MP |
2902 | DECLARE_WAITQUEUE(wait, current); |
2903 | ||
b44ebeb0 | 2904 | add_wait_queue(&md->wait, &wait); |
46125c1c MB |
2905 | |
2906 | while (1) { | |
401600df | 2907 | set_current_state(interruptible); |
46125c1c | 2908 | |
b4324fee | 2909 | if (!md_in_flight(md)) |
46125c1c MB |
2910 | break; |
2911 | ||
401600df MP |
2912 | if (interruptible == TASK_INTERRUPTIBLE && |
2913 | signal_pending(current)) { | |
46125c1c MB |
2914 | r = -EINTR; |
2915 | break; | |
2916 | } | |
2917 | ||
2918 | io_schedule(); | |
2919 | } | |
2920 | set_current_state(TASK_RUNNING); | |
2921 | ||
b44ebeb0 MP |
2922 | remove_wait_queue(&md->wait, &wait); |
2923 | ||
46125c1c MB |
2924 | return r; |
2925 | } | |
2926 | ||
1da177e4 LT |
2927 | /* |
2928 | * Process the deferred bios | |
2929 | */ | |
ef208587 | 2930 | static void dm_wq_work(struct work_struct *work) |
1da177e4 | 2931 | { |
ef208587 MP |
2932 | struct mapped_device *md = container_of(work, struct mapped_device, |
2933 | work); | |
6d6f10df | 2934 | struct bio *c; |
83d5e5b0 MP |
2935 | int srcu_idx; |
2936 | struct dm_table *map; | |
1da177e4 | 2937 | |
83d5e5b0 | 2938 | map = dm_get_live_table(md, &srcu_idx); |
ef208587 | 2939 | |
3b00b203 | 2940 | while (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) { |
df12ee99 AK |
2941 | spin_lock_irq(&md->deferred_lock); |
2942 | c = bio_list_pop(&md->deferred); | |
2943 | spin_unlock_irq(&md->deferred_lock); | |
2944 | ||
6a8736d1 | 2945 | if (!c) |
df12ee99 | 2946 | break; |
022c2611 | 2947 | |
e6ee8c0b KU |
2948 | if (dm_request_based(md)) |
2949 | generic_make_request(c); | |
6a8736d1 | 2950 | else |
83d5e5b0 | 2951 | __split_and_process_bio(md, map, c); |
022c2611 | 2952 | } |
73d410c0 | 2953 | |
83d5e5b0 | 2954 | dm_put_live_table(md, srcu_idx); |
1da177e4 LT |
2955 | } |
2956 | ||
9a1fb464 | 2957 | static void dm_queue_flush(struct mapped_device *md) |
304f3f6a | 2958 | { |
3b00b203 | 2959 | clear_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
4e857c58 | 2960 | smp_mb__after_atomic(); |
53d5914f | 2961 | queue_work(md->wq, &md->work); |
304f3f6a MB |
2962 | } |
2963 | ||
1da177e4 | 2964 | /* |
042d2a9b | 2965 | * Swap in a new table, returning the old one for the caller to destroy. |
1da177e4 | 2966 | */ |
042d2a9b | 2967 | struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table) |
1da177e4 | 2968 | { |
87eb5b21 | 2969 | struct dm_table *live_map = NULL, *map = ERR_PTR(-EINVAL); |
754c5fc7 | 2970 | struct queue_limits limits; |
042d2a9b | 2971 | int r; |
1da177e4 | 2972 | |
e61290a4 | 2973 | mutex_lock(&md->suspend_lock); |
1da177e4 LT |
2974 | |
2975 | /* device must be suspended */ | |
4f186f8b | 2976 | if (!dm_suspended_md(md)) |
93c534ae | 2977 | goto out; |
1da177e4 | 2978 | |
3ae70656 MS |
2979 | /* |
2980 | * If the new table has no data devices, retain the existing limits. | |
2981 | * This helps multipath with queue_if_no_path if all paths disappear, | |
2982 | * then new I/O is queued based on these limits, and then some paths | |
2983 | * reappear. | |
2984 | */ | |
2985 | if (dm_table_has_no_data_devices(table)) { | |
83d5e5b0 | 2986 | live_map = dm_get_live_table_fast(md); |
3ae70656 MS |
2987 | if (live_map) |
2988 | limits = md->queue->limits; | |
83d5e5b0 | 2989 | dm_put_live_table_fast(md); |
3ae70656 MS |
2990 | } |
2991 | ||
87eb5b21 MC |
2992 | if (!live_map) { |
2993 | r = dm_calculate_queue_limits(table, &limits); | |
2994 | if (r) { | |
2995 | map = ERR_PTR(r); | |
2996 | goto out; | |
2997 | } | |
042d2a9b | 2998 | } |
754c5fc7 | 2999 | |
042d2a9b | 3000 | map = __bind(md, table, &limits); |
1da177e4 | 3001 | |
93c534ae | 3002 | out: |
e61290a4 | 3003 | mutex_unlock(&md->suspend_lock); |
042d2a9b | 3004 | return map; |
1da177e4 LT |
3005 | } |
3006 | ||
3007 | /* | |
3008 | * Functions to lock and unlock any filesystem running on the | |
3009 | * device. | |
3010 | */ | |
2ca3310e | 3011 | static int lock_fs(struct mapped_device *md) |
1da177e4 | 3012 | { |
e39e2e95 | 3013 | int r; |
1da177e4 LT |
3014 | |
3015 | WARN_ON(md->frozen_sb); | |
dfbe03f6 | 3016 | |
db8fef4f | 3017 | md->frozen_sb = freeze_bdev(md->bdev); |
dfbe03f6 | 3018 | if (IS_ERR(md->frozen_sb)) { |
cf222b37 | 3019 | r = PTR_ERR(md->frozen_sb); |
e39e2e95 AK |
3020 | md->frozen_sb = NULL; |
3021 | return r; | |
dfbe03f6 AK |
3022 | } |
3023 | ||
aa8d7c2f AK |
3024 | set_bit(DMF_FROZEN, &md->flags); |
3025 | ||
1da177e4 LT |
3026 | return 0; |
3027 | } | |
3028 | ||
2ca3310e | 3029 | static void unlock_fs(struct mapped_device *md) |
1da177e4 | 3030 | { |
aa8d7c2f AK |
3031 | if (!test_bit(DMF_FROZEN, &md->flags)) |
3032 | return; | |
3033 | ||
db8fef4f | 3034 | thaw_bdev(md->bdev, md->frozen_sb); |
1da177e4 | 3035 | md->frozen_sb = NULL; |
aa8d7c2f | 3036 | clear_bit(DMF_FROZEN, &md->flags); |
1da177e4 LT |
3037 | } |
3038 | ||
3039 | /* | |
ffcc3936 MS |
3040 | * If __dm_suspend returns 0, the device is completely quiescent |
3041 | * now. There is no request-processing activity. All new requests | |
3042 | * are being added to md->deferred list. | |
cec47e3d | 3043 | * |
ffcc3936 | 3044 | * Caller must hold md->suspend_lock |
cec47e3d | 3045 | */ |
ffcc3936 MS |
3046 | static int __dm_suspend(struct mapped_device *md, struct dm_table *map, |
3047 | unsigned suspend_flags, int interruptible) | |
1da177e4 | 3048 | { |
ffcc3936 MS |
3049 | bool do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG; |
3050 | bool noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG; | |
3051 | int r; | |
1da177e4 | 3052 | |
2e93ccc1 KU |
3053 | /* |
3054 | * DMF_NOFLUSH_SUSPENDING must be set before presuspend. | |
3055 | * This flag is cleared before dm_suspend returns. | |
3056 | */ | |
3057 | if (noflush) | |
3058 | set_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); | |
3059 | ||
d67ee213 MS |
3060 | /* |
3061 | * This gets reverted if there's an error later and the targets | |
3062 | * provide the .presuspend_undo hook. | |
3063 | */ | |
cf222b37 AK |
3064 | dm_table_presuspend_targets(map); |
3065 | ||
32a926da | 3066 | /* |
9f518b27 KU |
3067 | * Flush I/O to the device. |
3068 | * Any I/O submitted after lock_fs() may not be flushed. | |
3069 | * noflush takes precedence over do_lockfs. | |
3070 | * (lock_fs() flushes I/Os and waits for them to complete.) | |
32a926da MP |
3071 | */ |
3072 | if (!noflush && do_lockfs) { | |
3073 | r = lock_fs(md); | |
d67ee213 MS |
3074 | if (r) { |
3075 | dm_table_presuspend_undo_targets(map); | |
ffcc3936 | 3076 | return r; |
d67ee213 | 3077 | } |
aa8d7c2f | 3078 | } |
1da177e4 LT |
3079 | |
3080 | /* | |
3b00b203 MP |
3081 | * Here we must make sure that no processes are submitting requests |
3082 | * to target drivers i.e. no one may be executing | |
3083 | * __split_and_process_bio. This is called from dm_request and | |
3084 | * dm_wq_work. | |
3085 | * | |
3086 | * To get all processes out of __split_and_process_bio in dm_request, | |
3087 | * we take the write lock. To prevent any process from reentering | |
6a8736d1 TH |
3088 | * __split_and_process_bio from dm_request and quiesce the thread |
3089 | * (dm_wq_work), we set BMF_BLOCK_IO_FOR_SUSPEND and call | |
3090 | * flush_workqueue(md->wq). | |
1da177e4 | 3091 | */ |
1eb787ec | 3092 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
41abc4e1 HR |
3093 | if (map) |
3094 | synchronize_srcu(&md->io_barrier); | |
1da177e4 | 3095 | |
d0bcb878 | 3096 | /* |
29e4013d TH |
3097 | * Stop md->queue before flushing md->wq in case request-based |
3098 | * dm defers requests to md->wq from md->queue. | |
d0bcb878 | 3099 | */ |
2eb6e1e3 | 3100 | if (dm_request_based(md)) { |
9f518b27 | 3101 | stop_queue(md->queue); |
02233342 MS |
3102 | if (md->kworker_task) |
3103 | flush_kthread_worker(&md->kworker); | |
2eb6e1e3 | 3104 | } |
cec47e3d | 3105 | |
d0bcb878 KU |
3106 | flush_workqueue(md->wq); |
3107 | ||
1da177e4 | 3108 | /* |
3b00b203 MP |
3109 | * At this point no more requests are entering target request routines. |
3110 | * We call dm_wait_for_completion to wait for all existing requests | |
3111 | * to finish. | |
1da177e4 | 3112 | */ |
ffcc3936 | 3113 | r = dm_wait_for_completion(md, interruptible); |
1da177e4 | 3114 | |
6d6f10df | 3115 | if (noflush) |
022c2611 | 3116 | clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); |
41abc4e1 HR |
3117 | if (map) |
3118 | synchronize_srcu(&md->io_barrier); | |
2e93ccc1 | 3119 | |
1da177e4 | 3120 | /* were we interrupted ? */ |
46125c1c | 3121 | if (r < 0) { |
9a1fb464 | 3122 | dm_queue_flush(md); |
73d410c0 | 3123 | |
cec47e3d | 3124 | if (dm_request_based(md)) |
9f518b27 | 3125 | start_queue(md->queue); |
cec47e3d | 3126 | |
2ca3310e | 3127 | unlock_fs(md); |
d67ee213 | 3128 | dm_table_presuspend_undo_targets(map); |
ffcc3936 | 3129 | /* pushback list is already flushed, so skip flush */ |
2ca3310e | 3130 | } |
1da177e4 | 3131 | |
ffcc3936 MS |
3132 | return r; |
3133 | } | |
3134 | ||
3135 | /* | |
3136 | * We need to be able to change a mapping table under a mounted | |
3137 | * filesystem. For example we might want to move some data in | |
3138 | * the background. Before the table can be swapped with | |
3139 | * dm_bind_table, dm_suspend must be called to flush any in | |
3140 | * flight bios and ensure that any further io gets deferred. | |
3141 | */ | |
3142 | /* | |
3143 | * Suspend mechanism in request-based dm. | |
3144 | * | |
3145 | * 1. Flush all I/Os by lock_fs() if needed. | |
3146 | * 2. Stop dispatching any I/O by stopping the request_queue. | |
3147 | * 3. Wait for all in-flight I/Os to be completed or requeued. | |
3148 | * | |
3149 | * To abort suspend, start the request_queue. | |
3150 | */ | |
3151 | int dm_suspend(struct mapped_device *md, unsigned suspend_flags) | |
3152 | { | |
3153 | struct dm_table *map = NULL; | |
3154 | int r = 0; | |
3155 | ||
3156 | retry: | |
3157 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); | |
3158 | ||
3159 | if (dm_suspended_md(md)) { | |
3160 | r = -EINVAL; | |
3161 | goto out_unlock; | |
3162 | } | |
3163 | ||
3164 | if (dm_suspended_internally_md(md)) { | |
3165 | /* already internally suspended, wait for internal resume */ | |
3166 | mutex_unlock(&md->suspend_lock); | |
3167 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); | |
3168 | if (r) | |
3169 | return r; | |
3170 | goto retry; | |
3171 | } | |
3172 | ||
a12f5d48 | 3173 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
ffcc3936 MS |
3174 | |
3175 | r = __dm_suspend(md, map, suspend_flags, TASK_INTERRUPTIBLE); | |
3176 | if (r) | |
3177 | goto out_unlock; | |
3b00b203 | 3178 | |
2ca3310e | 3179 | set_bit(DMF_SUSPENDED, &md->flags); |
b84b0287 | 3180 | |
4d4471cb KU |
3181 | dm_table_postsuspend_targets(map); |
3182 | ||
d287483d | 3183 | out_unlock: |
e61290a4 | 3184 | mutex_unlock(&md->suspend_lock); |
cf222b37 | 3185 | return r; |
1da177e4 LT |
3186 | } |
3187 | ||
ffcc3936 MS |
3188 | static int __dm_resume(struct mapped_device *md, struct dm_table *map) |
3189 | { | |
3190 | if (map) { | |
3191 | int r = dm_table_resume_targets(map); | |
3192 | if (r) | |
3193 | return r; | |
3194 | } | |
3195 | ||
3196 | dm_queue_flush(md); | |
3197 | ||
3198 | /* | |
3199 | * Flushing deferred I/Os must be done after targets are resumed | |
3200 | * so that mapping of targets can work correctly. | |
3201 | * Request-based dm is queueing the deferred I/Os in its request_queue. | |
3202 | */ | |
3203 | if (dm_request_based(md)) | |
3204 | start_queue(md->queue); | |
3205 | ||
3206 | unlock_fs(md); | |
3207 | ||
3208 | return 0; | |
3209 | } | |
3210 | ||
1da177e4 LT |
3211 | int dm_resume(struct mapped_device *md) |
3212 | { | |
cf222b37 | 3213 | int r = -EINVAL; |
cf222b37 | 3214 | struct dm_table *map = NULL; |
1da177e4 | 3215 | |
ffcc3936 MS |
3216 | retry: |
3217 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); | |
3218 | ||
4f186f8b | 3219 | if (!dm_suspended_md(md)) |
cf222b37 | 3220 | goto out; |
cf222b37 | 3221 | |
ffcc3936 MS |
3222 | if (dm_suspended_internally_md(md)) { |
3223 | /* already internally suspended, wait for internal resume */ | |
3224 | mutex_unlock(&md->suspend_lock); | |
3225 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); | |
3226 | if (r) | |
3227 | return r; | |
3228 | goto retry; | |
3229 | } | |
3230 | ||
a12f5d48 | 3231 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
2ca3310e | 3232 | if (!map || !dm_table_get_size(map)) |
cf222b37 | 3233 | goto out; |
1da177e4 | 3234 | |
ffcc3936 | 3235 | r = __dm_resume(md, map); |
8757b776 MB |
3236 | if (r) |
3237 | goto out; | |
2ca3310e | 3238 | |
2ca3310e AK |
3239 | clear_bit(DMF_SUSPENDED, &md->flags); |
3240 | ||
cf222b37 AK |
3241 | r = 0; |
3242 | out: | |
e61290a4 | 3243 | mutex_unlock(&md->suspend_lock); |
2ca3310e | 3244 | |
cf222b37 | 3245 | return r; |
1da177e4 LT |
3246 | } |
3247 | ||
fd2ed4d2 MP |
3248 | /* |
3249 | * Internal suspend/resume works like userspace-driven suspend. It waits | |
3250 | * until all bios finish and prevents issuing new bios to the target drivers. | |
3251 | * It may be used only from the kernel. | |
fd2ed4d2 MP |
3252 | */ |
3253 | ||
ffcc3936 | 3254 | static void __dm_internal_suspend(struct mapped_device *md, unsigned suspend_flags) |
fd2ed4d2 | 3255 | { |
ffcc3936 MS |
3256 | struct dm_table *map = NULL; |
3257 | ||
96b26c8c | 3258 | if (md->internal_suspend_count++) |
ffcc3936 MS |
3259 | return; /* nested internal suspend */ |
3260 | ||
3261 | if (dm_suspended_md(md)) { | |
3262 | set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
3263 | return; /* nest suspend */ | |
3264 | } | |
3265 | ||
a12f5d48 | 3266 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
ffcc3936 MS |
3267 | |
3268 | /* | |
3269 | * Using TASK_UNINTERRUPTIBLE because only NOFLUSH internal suspend is | |
3270 | * supported. Properly supporting a TASK_INTERRUPTIBLE internal suspend | |
3271 | * would require changing .presuspend to return an error -- avoid this | |
3272 | * until there is a need for more elaborate variants of internal suspend. | |
3273 | */ | |
3274 | (void) __dm_suspend(md, map, suspend_flags, TASK_UNINTERRUPTIBLE); | |
3275 | ||
3276 | set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
3277 | ||
3278 | dm_table_postsuspend_targets(map); | |
3279 | } | |
3280 | ||
3281 | static void __dm_internal_resume(struct mapped_device *md) | |
3282 | { | |
96b26c8c MP |
3283 | BUG_ON(!md->internal_suspend_count); |
3284 | ||
3285 | if (--md->internal_suspend_count) | |
ffcc3936 MS |
3286 | return; /* resume from nested internal suspend */ |
3287 | ||
fd2ed4d2 | 3288 | if (dm_suspended_md(md)) |
ffcc3936 MS |
3289 | goto done; /* resume from nested suspend */ |
3290 | ||
3291 | /* | |
3292 | * NOTE: existing callers don't need to call dm_table_resume_targets | |
3293 | * (which may fail -- so best to avoid it for now by passing NULL map) | |
3294 | */ | |
3295 | (void) __dm_resume(md, NULL); | |
3296 | ||
3297 | done: | |
3298 | clear_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
3299 | smp_mb__after_atomic(); | |
3300 | wake_up_bit(&md->flags, DMF_SUSPENDED_INTERNALLY); | |
3301 | } | |
3302 | ||
3303 | void dm_internal_suspend_noflush(struct mapped_device *md) | |
3304 | { | |
3305 | mutex_lock(&md->suspend_lock); | |
3306 | __dm_internal_suspend(md, DM_SUSPEND_NOFLUSH_FLAG); | |
3307 | mutex_unlock(&md->suspend_lock); | |
3308 | } | |
3309 | EXPORT_SYMBOL_GPL(dm_internal_suspend_noflush); | |
3310 | ||
3311 | void dm_internal_resume(struct mapped_device *md) | |
3312 | { | |
3313 | mutex_lock(&md->suspend_lock); | |
3314 | __dm_internal_resume(md); | |
3315 | mutex_unlock(&md->suspend_lock); | |
3316 | } | |
3317 | EXPORT_SYMBOL_GPL(dm_internal_resume); | |
3318 | ||
3319 | /* | |
3320 | * Fast variants of internal suspend/resume hold md->suspend_lock, | |
3321 | * which prevents interaction with userspace-driven suspend. | |
3322 | */ | |
3323 | ||
3324 | void dm_internal_suspend_fast(struct mapped_device *md) | |
3325 | { | |
3326 | mutex_lock(&md->suspend_lock); | |
3327 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) | |
fd2ed4d2 MP |
3328 | return; |
3329 | ||
3330 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); | |
3331 | synchronize_srcu(&md->io_barrier); | |
3332 | flush_workqueue(md->wq); | |
3333 | dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE); | |
3334 | } | |
b735fede | 3335 | EXPORT_SYMBOL_GPL(dm_internal_suspend_fast); |
fd2ed4d2 | 3336 | |
ffcc3936 | 3337 | void dm_internal_resume_fast(struct mapped_device *md) |
fd2ed4d2 | 3338 | { |
ffcc3936 | 3339 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) |
fd2ed4d2 MP |
3340 | goto done; |
3341 | ||
3342 | dm_queue_flush(md); | |
3343 | ||
3344 | done: | |
3345 | mutex_unlock(&md->suspend_lock); | |
3346 | } | |
b735fede | 3347 | EXPORT_SYMBOL_GPL(dm_internal_resume_fast); |
fd2ed4d2 | 3348 | |
1da177e4 LT |
3349 | /*----------------------------------------------------------------- |
3350 | * Event notification. | |
3351 | *---------------------------------------------------------------*/ | |
3abf85b5 | 3352 | int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, |
60935eb2 | 3353 | unsigned cookie) |
69267a30 | 3354 | { |
60935eb2 MB |
3355 | char udev_cookie[DM_COOKIE_LENGTH]; |
3356 | char *envp[] = { udev_cookie, NULL }; | |
3357 | ||
3358 | if (!cookie) | |
3abf85b5 | 3359 | return kobject_uevent(&disk_to_dev(md->disk)->kobj, action); |
60935eb2 MB |
3360 | else { |
3361 | snprintf(udev_cookie, DM_COOKIE_LENGTH, "%s=%u", | |
3362 | DM_COOKIE_ENV_VAR_NAME, cookie); | |
3abf85b5 PR |
3363 | return kobject_uevent_env(&disk_to_dev(md->disk)->kobj, |
3364 | action, envp); | |
60935eb2 | 3365 | } |
69267a30 AK |
3366 | } |
3367 | ||
7a8c3d3b MA |
3368 | uint32_t dm_next_uevent_seq(struct mapped_device *md) |
3369 | { | |
3370 | return atomic_add_return(1, &md->uevent_seq); | |
3371 | } | |
3372 | ||
1da177e4 LT |
3373 | uint32_t dm_get_event_nr(struct mapped_device *md) |
3374 | { | |
3375 | return atomic_read(&md->event_nr); | |
3376 | } | |
3377 | ||
3378 | int dm_wait_event(struct mapped_device *md, int event_nr) | |
3379 | { | |
3380 | return wait_event_interruptible(md->eventq, | |
3381 | (event_nr != atomic_read(&md->event_nr))); | |
3382 | } | |
3383 | ||
7a8c3d3b MA |
3384 | void dm_uevent_add(struct mapped_device *md, struct list_head *elist) |
3385 | { | |
3386 | unsigned long flags; | |
3387 | ||
3388 | spin_lock_irqsave(&md->uevent_lock, flags); | |
3389 | list_add(elist, &md->uevent_list); | |
3390 | spin_unlock_irqrestore(&md->uevent_lock, flags); | |
3391 | } | |
3392 | ||
1da177e4 LT |
3393 | /* |
3394 | * The gendisk is only valid as long as you have a reference | |
3395 | * count on 'md'. | |
3396 | */ | |
3397 | struct gendisk *dm_disk(struct mapped_device *md) | |
3398 | { | |
3399 | return md->disk; | |
3400 | } | |
65ff5b7d | 3401 | EXPORT_SYMBOL_GPL(dm_disk); |
1da177e4 | 3402 | |
784aae73 MB |
3403 | struct kobject *dm_kobject(struct mapped_device *md) |
3404 | { | |
2995fa78 | 3405 | return &md->kobj_holder.kobj; |
784aae73 MB |
3406 | } |
3407 | ||
784aae73 MB |
3408 | struct mapped_device *dm_get_from_kobject(struct kobject *kobj) |
3409 | { | |
3410 | struct mapped_device *md; | |
3411 | ||
2995fa78 | 3412 | md = container_of(kobj, struct mapped_device, kobj_holder.kobj); |
784aae73 | 3413 | |
4d89b7b4 | 3414 | if (test_bit(DMF_FREEING, &md->flags) || |
432a212c | 3415 | dm_deleting_md(md)) |
4d89b7b4 MB |
3416 | return NULL; |
3417 | ||
784aae73 MB |
3418 | dm_get(md); |
3419 | return md; | |
3420 | } | |
3421 | ||
4f186f8b | 3422 | int dm_suspended_md(struct mapped_device *md) |
1da177e4 LT |
3423 | { |
3424 | return test_bit(DMF_SUSPENDED, &md->flags); | |
3425 | } | |
3426 | ||
ffcc3936 MS |
3427 | int dm_suspended_internally_md(struct mapped_device *md) |
3428 | { | |
3429 | return test_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
3430 | } | |
3431 | ||
2c140a24 MP |
3432 | int dm_test_deferred_remove_flag(struct mapped_device *md) |
3433 | { | |
3434 | return test_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
3435 | } | |
3436 | ||
64dbce58 KU |
3437 | int dm_suspended(struct dm_target *ti) |
3438 | { | |
ecdb2e25 | 3439 | return dm_suspended_md(dm_table_get_md(ti->table)); |
64dbce58 KU |
3440 | } |
3441 | EXPORT_SYMBOL_GPL(dm_suspended); | |
3442 | ||
2e93ccc1 KU |
3443 | int dm_noflush_suspending(struct dm_target *ti) |
3444 | { | |
ecdb2e25 | 3445 | return __noflush_suspending(dm_table_get_md(ti->table)); |
2e93ccc1 KU |
3446 | } |
3447 | EXPORT_SYMBOL_GPL(dm_noflush_suspending); | |
3448 | ||
5f1b670d CH |
3449 | struct dm_md_mempools *dm_alloc_bio_mempools(unsigned integrity, |
3450 | unsigned per_bio_data_size) | |
e6ee8c0b | 3451 | { |
5f1b670d CH |
3452 | struct dm_md_mempools *pools; |
3453 | unsigned int pool_size = dm_get_reserved_bio_based_ios(); | |
5f015204 | 3454 | unsigned int front_pad; |
e6ee8c0b | 3455 | |
5f1b670d | 3456 | pools = kzalloc(sizeof(*pools), GFP_KERNEL); |
e6ee8c0b KU |
3457 | if (!pools) |
3458 | return NULL; | |
3459 | ||
5f1b670d CH |
3460 | front_pad = roundup(per_bio_data_size, __alignof__(struct dm_target_io)) + |
3461 | offsetof(struct dm_target_io, clone); | |
17e149b8 | 3462 | |
5f1b670d CH |
3463 | pools->io_pool = mempool_create_slab_pool(pool_size, _io_cache); |
3464 | if (!pools->io_pool) | |
3465 | goto out; | |
e6ee8c0b | 3466 | |
3d8aab2d | 3467 | pools->bs = bioset_create_nobvec(pool_size, front_pad); |
e6ee8c0b | 3468 | if (!pools->bs) |
5f015204 | 3469 | goto out; |
e6ee8c0b | 3470 | |
a91a2785 | 3471 | if (integrity && bioset_integrity_create(pools->bs, pool_size)) |
5f015204 | 3472 | goto out; |
a91a2785 | 3473 | |
e6ee8c0b | 3474 | return pools; |
5f015204 JN |
3475 | out: |
3476 | dm_free_md_mempools(pools); | |
5f1b670d CH |
3477 | return NULL; |
3478 | } | |
3479 | ||
3480 | struct dm_md_mempools *dm_alloc_rq_mempools(struct mapped_device *md, | |
3481 | unsigned type) | |
3482 | { | |
3483 | unsigned int pool_size = dm_get_reserved_rq_based_ios(); | |
3484 | struct dm_md_mempools *pools; | |
e6ee8c0b | 3485 | |
5f1b670d CH |
3486 | pools = kzalloc(sizeof(*pools), GFP_KERNEL); |
3487 | if (!pools) | |
3488 | return NULL; | |
3489 | ||
3490 | if (filter_md_type(type, md) == DM_TYPE_REQUEST_BASED) { | |
3491 | pools->rq_pool = mempool_create_slab_pool(pool_size, _rq_cache); | |
3492 | if (!pools->rq_pool) | |
3493 | goto out; | |
3494 | } | |
3495 | ||
3496 | pools->io_pool = mempool_create_slab_pool(pool_size, _rq_tio_cache); | |
3497 | if (!pools->io_pool) | |
3498 | goto out; | |
3499 | ||
3500 | return pools; | |
3501 | out: | |
3502 | dm_free_md_mempools(pools); | |
e6ee8c0b KU |
3503 | return NULL; |
3504 | } | |
3505 | ||
3506 | void dm_free_md_mempools(struct dm_md_mempools *pools) | |
3507 | { | |
3508 | if (!pools) | |
3509 | return; | |
3510 | ||
3511 | if (pools->io_pool) | |
3512 | mempool_destroy(pools->io_pool); | |
3513 | ||
1ae49ea2 MS |
3514 | if (pools->rq_pool) |
3515 | mempool_destroy(pools->rq_pool); | |
3516 | ||
e6ee8c0b KU |
3517 | if (pools->bs) |
3518 | bioset_free(pools->bs); | |
3519 | ||
3520 | kfree(pools); | |
3521 | } | |
3522 | ||
83d5cde4 | 3523 | static const struct block_device_operations dm_blk_dops = { |
1da177e4 LT |
3524 | .open = dm_blk_open, |
3525 | .release = dm_blk_close, | |
aa129a22 | 3526 | .ioctl = dm_blk_ioctl, |
3ac51e74 | 3527 | .getgeo = dm_blk_getgeo, |
1da177e4 LT |
3528 | .owner = THIS_MODULE |
3529 | }; | |
3530 | ||
1da177e4 LT |
3531 | /* |
3532 | * module hooks | |
3533 | */ | |
3534 | module_init(dm_init); | |
3535 | module_exit(dm_exit); | |
3536 | ||
3537 | module_param(major, uint, 0); | |
3538 | MODULE_PARM_DESC(major, "The major number of the device mapper"); | |
f4790826 | 3539 | |
e8603136 MS |
3540 | module_param(reserved_bio_based_ios, uint, S_IRUGO | S_IWUSR); |
3541 | MODULE_PARM_DESC(reserved_bio_based_ios, "Reserved IOs in bio-based mempools"); | |
3542 | ||
f4790826 MS |
3543 | module_param(reserved_rq_based_ios, uint, S_IRUGO | S_IWUSR); |
3544 | MODULE_PARM_DESC(reserved_rq_based_ios, "Reserved IOs in request-based mempools"); | |
3545 | ||
17e149b8 MS |
3546 | module_param(use_blk_mq, bool, S_IRUGO | S_IWUSR); |
3547 | MODULE_PARM_DESC(use_blk_mq, "Use block multiqueue for request-based DM devices"); | |
3548 | ||
1da177e4 LT |
3549 | MODULE_DESCRIPTION(DM_NAME " driver"); |
3550 | MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>"); | |
3551 | MODULE_LICENSE("GPL"); |