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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 | ||
4cc96131 MS |
8 | #include "dm-core.h" |
9 | #include "dm-rq.h" | |
51e5b2bd | 10 | #include "dm-uevent.h" |
1da177e4 LT |
11 | |
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
48c9c27b | 14 | #include <linux/mutex.h> |
1da177e4 LT |
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> |
71cdb697 | 23 | #include <linux/pr.h> |
55782138 | 24 | |
72d94861 AK |
25 | #define DM_MSG_PREFIX "core" |
26 | ||
71a16736 NK |
27 | #ifdef CONFIG_PRINTK |
28 | /* | |
29 | * ratelimit state to be used in DMXXX_LIMIT(). | |
30 | */ | |
31 | DEFINE_RATELIMIT_STATE(dm_ratelimit_state, | |
32 | DEFAULT_RATELIMIT_INTERVAL, | |
33 | DEFAULT_RATELIMIT_BURST); | |
34 | EXPORT_SYMBOL(dm_ratelimit_state); | |
35 | #endif | |
36 | ||
60935eb2 MB |
37 | /* |
38 | * Cookies are numeric values sent with CHANGE and REMOVE | |
39 | * uevents while resuming, removing or renaming the device. | |
40 | */ | |
41 | #define DM_COOKIE_ENV_VAR_NAME "DM_COOKIE" | |
42 | #define DM_COOKIE_LENGTH 24 | |
43 | ||
1da177e4 LT |
44 | static const char *_name = DM_NAME; |
45 | ||
46 | static unsigned int major = 0; | |
47 | static unsigned int _major = 0; | |
48 | ||
d15b774c AK |
49 | static DEFINE_IDR(_minor_idr); |
50 | ||
f32c10b0 | 51 | static DEFINE_SPINLOCK(_minor_lock); |
2c140a24 MP |
52 | |
53 | static void do_deferred_remove(struct work_struct *w); | |
54 | ||
55 | static DECLARE_WORK(deferred_remove_work, do_deferred_remove); | |
56 | ||
acfe0ad7 MP |
57 | static struct workqueue_struct *deferred_remove_workqueue; |
58 | ||
1da177e4 LT |
59 | /* |
60 | * One of these is allocated per bio. | |
61 | */ | |
62 | struct dm_io { | |
63 | struct mapped_device *md; | |
64 | int error; | |
1da177e4 | 65 | atomic_t io_count; |
6ae2fa67 | 66 | struct bio *bio; |
3eaf840e | 67 | unsigned long start_time; |
f88fb981 | 68 | spinlock_t endio_lock; |
fd2ed4d2 | 69 | struct dm_stats_aux stats_aux; |
1da177e4 LT |
70 | }; |
71 | ||
ba61fdd1 JM |
72 | #define MINOR_ALLOCED ((void *)-1) |
73 | ||
1da177e4 LT |
74 | /* |
75 | * Bits for the md->flags field. | |
76 | */ | |
1eb787ec | 77 | #define DMF_BLOCK_IO_FOR_SUSPEND 0 |
1da177e4 | 78 | #define DMF_SUSPENDED 1 |
aa8d7c2f | 79 | #define DMF_FROZEN 2 |
fba9f90e | 80 | #define DMF_FREEING 3 |
5c6bd75d | 81 | #define DMF_DELETING 4 |
2e93ccc1 | 82 | #define DMF_NOFLUSH_SUSPENDING 5 |
8ae12666 KO |
83 | #define DMF_DEFERRED_REMOVE 6 |
84 | #define DMF_SUSPENDED_INTERNALLY 7 | |
1da177e4 | 85 | |
115485e8 | 86 | #define DM_NUMA_NODE NUMA_NO_NODE |
115485e8 | 87 | static int dm_numa_node = DM_NUMA_NODE; |
faad87df | 88 | |
e6ee8c0b KU |
89 | /* |
90 | * For mempools pre-allocation at the table loading time. | |
91 | */ | |
92 | struct dm_md_mempools { | |
93 | mempool_t *io_pool; | |
e6ee8c0b KU |
94 | struct bio_set *bs; |
95 | }; | |
96 | ||
86f1152b BM |
97 | struct table_device { |
98 | struct list_head list; | |
99 | atomic_t count; | |
100 | struct dm_dev dm_dev; | |
101 | }; | |
102 | ||
e18b890b | 103 | static struct kmem_cache *_io_cache; |
8fbf26ad | 104 | static struct kmem_cache *_rq_tio_cache; |
1ae49ea2 | 105 | static struct kmem_cache *_rq_cache; |
94818742 | 106 | |
e8603136 MS |
107 | /* |
108 | * Bio-based DM's mempools' reserved IOs set by the user. | |
109 | */ | |
4cc96131 | 110 | #define RESERVED_BIO_BASED_IOS 16 |
e8603136 MS |
111 | static unsigned reserved_bio_based_ios = RESERVED_BIO_BASED_IOS; |
112 | ||
115485e8 MS |
113 | static int __dm_get_module_param_int(int *module_param, int min, int max) |
114 | { | |
115 | int param = ACCESS_ONCE(*module_param); | |
116 | int modified_param = 0; | |
117 | bool modified = true; | |
118 | ||
119 | if (param < min) | |
120 | modified_param = min; | |
121 | else if (param > max) | |
122 | modified_param = max; | |
123 | else | |
124 | modified = false; | |
125 | ||
126 | if (modified) { | |
127 | (void)cmpxchg(module_param, param, modified_param); | |
128 | param = modified_param; | |
129 | } | |
130 | ||
131 | return param; | |
132 | } | |
133 | ||
4cc96131 MS |
134 | unsigned __dm_get_module_param(unsigned *module_param, |
135 | unsigned def, unsigned max) | |
f4790826 | 136 | { |
09c2d531 MS |
137 | unsigned param = ACCESS_ONCE(*module_param); |
138 | unsigned modified_param = 0; | |
f4790826 | 139 | |
09c2d531 MS |
140 | if (!param) |
141 | modified_param = def; | |
142 | else if (param > max) | |
143 | modified_param = max; | |
f4790826 | 144 | |
09c2d531 MS |
145 | if (modified_param) { |
146 | (void)cmpxchg(module_param, param, modified_param); | |
147 | param = modified_param; | |
f4790826 MS |
148 | } |
149 | ||
09c2d531 | 150 | return param; |
f4790826 MS |
151 | } |
152 | ||
e8603136 MS |
153 | unsigned dm_get_reserved_bio_based_ios(void) |
154 | { | |
09c2d531 | 155 | return __dm_get_module_param(&reserved_bio_based_ios, |
4cc96131 | 156 | RESERVED_BIO_BASED_IOS, DM_RESERVED_MAX_IOS); |
e8603136 MS |
157 | } |
158 | EXPORT_SYMBOL_GPL(dm_get_reserved_bio_based_ios); | |
159 | ||
115485e8 MS |
160 | static unsigned dm_get_numa_node(void) |
161 | { | |
162 | return __dm_get_module_param_int(&dm_numa_node, | |
163 | DM_NUMA_NODE, num_online_nodes() - 1); | |
164 | } | |
165 | ||
1da177e4 LT |
166 | static int __init local_init(void) |
167 | { | |
51157b4a | 168 | int r = -ENOMEM; |
1da177e4 | 169 | |
1da177e4 | 170 | /* allocate a slab for the dm_ios */ |
028867ac | 171 | _io_cache = KMEM_CACHE(dm_io, 0); |
1da177e4 | 172 | if (!_io_cache) |
51157b4a | 173 | return r; |
1da177e4 | 174 | |
8fbf26ad KU |
175 | _rq_tio_cache = KMEM_CACHE(dm_rq_target_io, 0); |
176 | if (!_rq_tio_cache) | |
dba14160 | 177 | goto out_free_io_cache; |
8fbf26ad | 178 | |
eca7ee6d | 179 | _rq_cache = kmem_cache_create("dm_old_clone_request", sizeof(struct request), |
1ae49ea2 MS |
180 | __alignof__(struct request), 0, NULL); |
181 | if (!_rq_cache) | |
182 | goto out_free_rq_tio_cache; | |
183 | ||
51e5b2bd | 184 | r = dm_uevent_init(); |
51157b4a | 185 | if (r) |
1ae49ea2 | 186 | goto out_free_rq_cache; |
51e5b2bd | 187 | |
acfe0ad7 MP |
188 | deferred_remove_workqueue = alloc_workqueue("kdmremove", WQ_UNBOUND, 1); |
189 | if (!deferred_remove_workqueue) { | |
190 | r = -ENOMEM; | |
191 | goto out_uevent_exit; | |
192 | } | |
193 | ||
1da177e4 LT |
194 | _major = major; |
195 | r = register_blkdev(_major, _name); | |
51157b4a | 196 | if (r < 0) |
acfe0ad7 | 197 | goto out_free_workqueue; |
1da177e4 LT |
198 | |
199 | if (!_major) | |
200 | _major = r; | |
201 | ||
202 | return 0; | |
51157b4a | 203 | |
acfe0ad7 MP |
204 | out_free_workqueue: |
205 | destroy_workqueue(deferred_remove_workqueue); | |
51157b4a KU |
206 | out_uevent_exit: |
207 | dm_uevent_exit(); | |
1ae49ea2 MS |
208 | out_free_rq_cache: |
209 | kmem_cache_destroy(_rq_cache); | |
8fbf26ad KU |
210 | out_free_rq_tio_cache: |
211 | kmem_cache_destroy(_rq_tio_cache); | |
51157b4a KU |
212 | out_free_io_cache: |
213 | kmem_cache_destroy(_io_cache); | |
214 | ||
215 | return r; | |
1da177e4 LT |
216 | } |
217 | ||
218 | static void local_exit(void) | |
219 | { | |
2c140a24 | 220 | flush_scheduled_work(); |
acfe0ad7 | 221 | destroy_workqueue(deferred_remove_workqueue); |
2c140a24 | 222 | |
1ae49ea2 | 223 | kmem_cache_destroy(_rq_cache); |
8fbf26ad | 224 | kmem_cache_destroy(_rq_tio_cache); |
1da177e4 | 225 | kmem_cache_destroy(_io_cache); |
00d59405 | 226 | unregister_blkdev(_major, _name); |
51e5b2bd | 227 | dm_uevent_exit(); |
1da177e4 LT |
228 | |
229 | _major = 0; | |
230 | ||
231 | DMINFO("cleaned up"); | |
232 | } | |
233 | ||
b9249e55 | 234 | static int (*_inits[])(void) __initdata = { |
1da177e4 LT |
235 | local_init, |
236 | dm_target_init, | |
237 | dm_linear_init, | |
238 | dm_stripe_init, | |
952b3557 | 239 | dm_io_init, |
945fa4d2 | 240 | dm_kcopyd_init, |
1da177e4 | 241 | dm_interface_init, |
fd2ed4d2 | 242 | dm_statistics_init, |
1da177e4 LT |
243 | }; |
244 | ||
b9249e55 | 245 | static void (*_exits[])(void) = { |
1da177e4 LT |
246 | local_exit, |
247 | dm_target_exit, | |
248 | dm_linear_exit, | |
249 | dm_stripe_exit, | |
952b3557 | 250 | dm_io_exit, |
945fa4d2 | 251 | dm_kcopyd_exit, |
1da177e4 | 252 | dm_interface_exit, |
fd2ed4d2 | 253 | dm_statistics_exit, |
1da177e4 LT |
254 | }; |
255 | ||
256 | static int __init dm_init(void) | |
257 | { | |
258 | const int count = ARRAY_SIZE(_inits); | |
259 | ||
260 | int r, i; | |
261 | ||
262 | for (i = 0; i < count; i++) { | |
263 | r = _inits[i](); | |
264 | if (r) | |
265 | goto bad; | |
266 | } | |
267 | ||
268 | return 0; | |
269 | ||
270 | bad: | |
271 | while (i--) | |
272 | _exits[i](); | |
273 | ||
274 | return r; | |
275 | } | |
276 | ||
277 | static void __exit dm_exit(void) | |
278 | { | |
279 | int i = ARRAY_SIZE(_exits); | |
280 | ||
281 | while (i--) | |
282 | _exits[i](); | |
d15b774c AK |
283 | |
284 | /* | |
285 | * Should be empty by this point. | |
286 | */ | |
d15b774c | 287 | idr_destroy(&_minor_idr); |
1da177e4 LT |
288 | } |
289 | ||
290 | /* | |
291 | * Block device functions | |
292 | */ | |
432a212c MA |
293 | int dm_deleting_md(struct mapped_device *md) |
294 | { | |
295 | return test_bit(DMF_DELETING, &md->flags); | |
296 | } | |
297 | ||
fe5f9f2c | 298 | static int dm_blk_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
299 | { |
300 | struct mapped_device *md; | |
301 | ||
fba9f90e JM |
302 | spin_lock(&_minor_lock); |
303 | ||
fe5f9f2c | 304 | md = bdev->bd_disk->private_data; |
fba9f90e JM |
305 | if (!md) |
306 | goto out; | |
307 | ||
5c6bd75d | 308 | if (test_bit(DMF_FREEING, &md->flags) || |
432a212c | 309 | dm_deleting_md(md)) { |
fba9f90e JM |
310 | md = NULL; |
311 | goto out; | |
312 | } | |
313 | ||
1da177e4 | 314 | dm_get(md); |
5c6bd75d | 315 | atomic_inc(&md->open_count); |
fba9f90e JM |
316 | out: |
317 | spin_unlock(&_minor_lock); | |
318 | ||
319 | return md ? 0 : -ENXIO; | |
1da177e4 LT |
320 | } |
321 | ||
db2a144b | 322 | static void dm_blk_close(struct gendisk *disk, fmode_t mode) |
1da177e4 | 323 | { |
63a4f065 | 324 | struct mapped_device *md; |
6e9624b8 | 325 | |
4a1aeb98 MB |
326 | spin_lock(&_minor_lock); |
327 | ||
63a4f065 MS |
328 | md = disk->private_data; |
329 | if (WARN_ON(!md)) | |
330 | goto out; | |
331 | ||
2c140a24 MP |
332 | if (atomic_dec_and_test(&md->open_count) && |
333 | (test_bit(DMF_DEFERRED_REMOVE, &md->flags))) | |
acfe0ad7 | 334 | queue_work(deferred_remove_workqueue, &deferred_remove_work); |
2c140a24 | 335 | |
1da177e4 | 336 | dm_put(md); |
63a4f065 | 337 | out: |
4a1aeb98 | 338 | spin_unlock(&_minor_lock); |
1da177e4 LT |
339 | } |
340 | ||
5c6bd75d AK |
341 | int dm_open_count(struct mapped_device *md) |
342 | { | |
343 | return atomic_read(&md->open_count); | |
344 | } | |
345 | ||
346 | /* | |
347 | * Guarantees nothing is using the device before it's deleted. | |
348 | */ | |
2c140a24 | 349 | int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred) |
5c6bd75d AK |
350 | { |
351 | int r = 0; | |
352 | ||
353 | spin_lock(&_minor_lock); | |
354 | ||
2c140a24 | 355 | if (dm_open_count(md)) { |
5c6bd75d | 356 | r = -EBUSY; |
2c140a24 MP |
357 | if (mark_deferred) |
358 | set_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
359 | } else if (only_deferred && !test_bit(DMF_DEFERRED_REMOVE, &md->flags)) | |
360 | r = -EEXIST; | |
5c6bd75d AK |
361 | else |
362 | set_bit(DMF_DELETING, &md->flags); | |
363 | ||
364 | spin_unlock(&_minor_lock); | |
365 | ||
366 | return r; | |
367 | } | |
368 | ||
2c140a24 MP |
369 | int dm_cancel_deferred_remove(struct mapped_device *md) |
370 | { | |
371 | int r = 0; | |
372 | ||
373 | spin_lock(&_minor_lock); | |
374 | ||
375 | if (test_bit(DMF_DELETING, &md->flags)) | |
376 | r = -EBUSY; | |
377 | else | |
378 | clear_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
379 | ||
380 | spin_unlock(&_minor_lock); | |
381 | ||
382 | return r; | |
383 | } | |
384 | ||
385 | static void do_deferred_remove(struct work_struct *w) | |
386 | { | |
387 | dm_deferred_remove(); | |
388 | } | |
389 | ||
fd2ed4d2 MP |
390 | sector_t dm_get_size(struct mapped_device *md) |
391 | { | |
392 | return get_capacity(md->disk); | |
393 | } | |
394 | ||
9974fa2c MS |
395 | struct request_queue *dm_get_md_queue(struct mapped_device *md) |
396 | { | |
397 | return md->queue; | |
398 | } | |
399 | ||
fd2ed4d2 MP |
400 | struct dm_stats *dm_get_stats(struct mapped_device *md) |
401 | { | |
402 | return &md->stats; | |
403 | } | |
404 | ||
3ac51e74 DW |
405 | static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
406 | { | |
407 | struct mapped_device *md = bdev->bd_disk->private_data; | |
408 | ||
409 | return dm_get_geometry(md, geo); | |
410 | } | |
411 | ||
956a4025 MS |
412 | static int dm_grab_bdev_for_ioctl(struct mapped_device *md, |
413 | struct block_device **bdev, | |
414 | fmode_t *mode) | |
aa129a22 | 415 | { |
66482026 | 416 | struct dm_target *tgt; |
6c182cd8 | 417 | struct dm_table *map; |
956a4025 | 418 | int srcu_idx, r; |
aa129a22 | 419 | |
6c182cd8 | 420 | retry: |
e56f81e0 | 421 | r = -ENOTTY; |
956a4025 | 422 | map = dm_get_live_table(md, &srcu_idx); |
aa129a22 MB |
423 | if (!map || !dm_table_get_size(map)) |
424 | goto out; | |
425 | ||
426 | /* We only support devices that have a single target */ | |
427 | if (dm_table_get_num_targets(map) != 1) | |
428 | goto out; | |
429 | ||
66482026 MS |
430 | tgt = dm_table_get_target(map, 0); |
431 | if (!tgt->type->prepare_ioctl) | |
4d341d82 | 432 | goto out; |
aa129a22 | 433 | |
4f186f8b | 434 | if (dm_suspended_md(md)) { |
aa129a22 MB |
435 | r = -EAGAIN; |
436 | goto out; | |
437 | } | |
438 | ||
66482026 | 439 | r = tgt->type->prepare_ioctl(tgt, bdev, mode); |
e56f81e0 CH |
440 | if (r < 0) |
441 | goto out; | |
aa129a22 | 442 | |
956a4025 MS |
443 | bdgrab(*bdev); |
444 | dm_put_live_table(md, srcu_idx); | |
e56f81e0 | 445 | return r; |
aa129a22 | 446 | |
aa129a22 | 447 | out: |
956a4025 | 448 | dm_put_live_table(md, srcu_idx); |
5bbbfdf6 | 449 | if (r == -ENOTCONN && !fatal_signal_pending(current)) { |
6c182cd8 HR |
450 | msleep(10); |
451 | goto retry; | |
452 | } | |
e56f81e0 CH |
453 | return r; |
454 | } | |
455 | ||
456 | static int dm_blk_ioctl(struct block_device *bdev, fmode_t mode, | |
457 | unsigned int cmd, unsigned long arg) | |
458 | { | |
459 | struct mapped_device *md = bdev->bd_disk->private_data; | |
956a4025 | 460 | int r; |
e56f81e0 | 461 | |
956a4025 | 462 | r = dm_grab_bdev_for_ioctl(md, &bdev, &mode); |
e56f81e0 CH |
463 | if (r < 0) |
464 | return r; | |
6c182cd8 | 465 | |
e56f81e0 CH |
466 | if (r > 0) { |
467 | /* | |
e980f623 CH |
468 | * Target determined this ioctl is being issued against a |
469 | * subset of the parent bdev; require extra privileges. | |
e56f81e0 | 470 | */ |
e980f623 CH |
471 | if (!capable(CAP_SYS_RAWIO)) { |
472 | DMWARN_LIMIT( | |
473 | "%s: sending ioctl %x to DM device without required privilege.", | |
474 | current->comm, cmd); | |
475 | r = -ENOIOCTLCMD; | |
e56f81e0 | 476 | goto out; |
e980f623 | 477 | } |
e56f81e0 | 478 | } |
6c182cd8 | 479 | |
66482026 | 480 | r = __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
e56f81e0 | 481 | out: |
956a4025 | 482 | bdput(bdev); |
aa129a22 MB |
483 | return r; |
484 | } | |
485 | ||
028867ac | 486 | static struct dm_io *alloc_io(struct mapped_device *md) |
1da177e4 LT |
487 | { |
488 | return mempool_alloc(md->io_pool, GFP_NOIO); | |
489 | } | |
490 | ||
028867ac | 491 | static void free_io(struct mapped_device *md, struct dm_io *io) |
1da177e4 LT |
492 | { |
493 | mempool_free(io, md->io_pool); | |
494 | } | |
495 | ||
cfae7529 | 496 | static void free_tio(struct dm_target_io *tio) |
1da177e4 | 497 | { |
dba14160 | 498 | bio_put(&tio->clone); |
1da177e4 LT |
499 | } |
500 | ||
4cc96131 | 501 | int md_in_flight(struct mapped_device *md) |
90abb8c4 KU |
502 | { |
503 | return atomic_read(&md->pending[READ]) + | |
504 | atomic_read(&md->pending[WRITE]); | |
505 | } | |
506 | ||
3eaf840e JNN |
507 | static void start_io_acct(struct dm_io *io) |
508 | { | |
509 | struct mapped_device *md = io->md; | |
fd2ed4d2 | 510 | struct bio *bio = io->bio; |
c9959059 | 511 | int cpu; |
fd2ed4d2 | 512 | int rw = bio_data_dir(bio); |
3eaf840e JNN |
513 | |
514 | io->start_time = jiffies; | |
515 | ||
074a7aca TH |
516 | cpu = part_stat_lock(); |
517 | part_round_stats(cpu, &dm_disk(md)->part0); | |
518 | part_stat_unlock(); | |
1e9bb880 SL |
519 | atomic_set(&dm_disk(md)->part0.in_flight[rw], |
520 | atomic_inc_return(&md->pending[rw])); | |
fd2ed4d2 MP |
521 | |
522 | if (unlikely(dm_stats_used(&md->stats))) | |
528ec5ab MC |
523 | dm_stats_account_io(&md->stats, bio_data_dir(bio), |
524 | bio->bi_iter.bi_sector, bio_sectors(bio), | |
525 | false, 0, &io->stats_aux); | |
3eaf840e JNN |
526 | } |
527 | ||
d221d2e7 | 528 | static void end_io_acct(struct dm_io *io) |
3eaf840e JNN |
529 | { |
530 | struct mapped_device *md = io->md; | |
531 | struct bio *bio = io->bio; | |
532 | unsigned long duration = jiffies - io->start_time; | |
18c0b223 | 533 | int pending; |
3eaf840e JNN |
534 | int rw = bio_data_dir(bio); |
535 | ||
18c0b223 | 536 | generic_end_io_acct(rw, &dm_disk(md)->part0, io->start_time); |
3eaf840e | 537 | |
fd2ed4d2 | 538 | if (unlikely(dm_stats_used(&md->stats))) |
528ec5ab MC |
539 | dm_stats_account_io(&md->stats, bio_data_dir(bio), |
540 | bio->bi_iter.bi_sector, bio_sectors(bio), | |
541 | true, duration, &io->stats_aux); | |
fd2ed4d2 | 542 | |
af7e466a MP |
543 | /* |
544 | * After this is decremented the bio must not be touched if it is | |
d87f4c14 | 545 | * a flush. |
af7e466a | 546 | */ |
1e9bb880 SL |
547 | pending = atomic_dec_return(&md->pending[rw]); |
548 | atomic_set(&dm_disk(md)->part0.in_flight[rw], pending); | |
316d315b | 549 | pending += atomic_read(&md->pending[rw^0x1]); |
3eaf840e | 550 | |
d221d2e7 MP |
551 | /* nudge anyone waiting on suspend queue */ |
552 | if (!pending) | |
553 | wake_up(&md->wait); | |
3eaf840e JNN |
554 | } |
555 | ||
1da177e4 LT |
556 | /* |
557 | * Add the bio to the list of deferred io. | |
558 | */ | |
92c63902 | 559 | static void queue_io(struct mapped_device *md, struct bio *bio) |
1da177e4 | 560 | { |
05447420 | 561 | unsigned long flags; |
1da177e4 | 562 | |
05447420 | 563 | spin_lock_irqsave(&md->deferred_lock, flags); |
1da177e4 | 564 | bio_list_add(&md->deferred, bio); |
05447420 | 565 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
6a8736d1 | 566 | queue_work(md->wq, &md->work); |
1da177e4 LT |
567 | } |
568 | ||
569 | /* | |
570 | * Everyone (including functions in this file), should use this | |
571 | * function to access the md->map field, and make sure they call | |
83d5e5b0 | 572 | * dm_put_live_table() when finished. |
1da177e4 | 573 | */ |
83d5e5b0 | 574 | struct dm_table *dm_get_live_table(struct mapped_device *md, int *srcu_idx) __acquires(md->io_barrier) |
1da177e4 | 575 | { |
83d5e5b0 MP |
576 | *srcu_idx = srcu_read_lock(&md->io_barrier); |
577 | ||
578 | return srcu_dereference(md->map, &md->io_barrier); | |
579 | } | |
1da177e4 | 580 | |
83d5e5b0 MP |
581 | void dm_put_live_table(struct mapped_device *md, int srcu_idx) __releases(md->io_barrier) |
582 | { | |
583 | srcu_read_unlock(&md->io_barrier, srcu_idx); | |
584 | } | |
585 | ||
586 | void dm_sync_table(struct mapped_device *md) | |
587 | { | |
588 | synchronize_srcu(&md->io_barrier); | |
589 | synchronize_rcu_expedited(); | |
590 | } | |
591 | ||
592 | /* | |
593 | * A fast alternative to dm_get_live_table/dm_put_live_table. | |
594 | * The caller must not block between these two functions. | |
595 | */ | |
596 | static struct dm_table *dm_get_live_table_fast(struct mapped_device *md) __acquires(RCU) | |
597 | { | |
598 | rcu_read_lock(); | |
599 | return rcu_dereference(md->map); | |
600 | } | |
1da177e4 | 601 | |
83d5e5b0 MP |
602 | static void dm_put_live_table_fast(struct mapped_device *md) __releases(RCU) |
603 | { | |
604 | rcu_read_unlock(); | |
1da177e4 LT |
605 | } |
606 | ||
86f1152b BM |
607 | /* |
608 | * Open a table device so we can use it as a map destination. | |
609 | */ | |
610 | static int open_table_device(struct table_device *td, dev_t dev, | |
611 | struct mapped_device *md) | |
612 | { | |
613 | static char *_claim_ptr = "I belong to device-mapper"; | |
614 | struct block_device *bdev; | |
615 | ||
616 | int r; | |
617 | ||
618 | BUG_ON(td->dm_dev.bdev); | |
619 | ||
620 | bdev = blkdev_get_by_dev(dev, td->dm_dev.mode | FMODE_EXCL, _claim_ptr); | |
621 | if (IS_ERR(bdev)) | |
622 | return PTR_ERR(bdev); | |
623 | ||
624 | r = bd_link_disk_holder(bdev, dm_disk(md)); | |
625 | if (r) { | |
626 | blkdev_put(bdev, td->dm_dev.mode | FMODE_EXCL); | |
627 | return r; | |
628 | } | |
629 | ||
630 | td->dm_dev.bdev = bdev; | |
631 | return 0; | |
632 | } | |
633 | ||
634 | /* | |
635 | * Close a table device that we've been using. | |
636 | */ | |
637 | static void close_table_device(struct table_device *td, struct mapped_device *md) | |
638 | { | |
639 | if (!td->dm_dev.bdev) | |
640 | return; | |
641 | ||
642 | bd_unlink_disk_holder(td->dm_dev.bdev, dm_disk(md)); | |
643 | blkdev_put(td->dm_dev.bdev, td->dm_dev.mode | FMODE_EXCL); | |
644 | td->dm_dev.bdev = NULL; | |
645 | } | |
646 | ||
647 | static struct table_device *find_table_device(struct list_head *l, dev_t dev, | |
648 | fmode_t mode) { | |
649 | struct table_device *td; | |
650 | ||
651 | list_for_each_entry(td, l, list) | |
652 | if (td->dm_dev.bdev->bd_dev == dev && td->dm_dev.mode == mode) | |
653 | return td; | |
654 | ||
655 | return NULL; | |
656 | } | |
657 | ||
658 | int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode, | |
659 | struct dm_dev **result) { | |
660 | int r; | |
661 | struct table_device *td; | |
662 | ||
663 | mutex_lock(&md->table_devices_lock); | |
664 | td = find_table_device(&md->table_devices, dev, mode); | |
665 | if (!td) { | |
115485e8 | 666 | td = kmalloc_node(sizeof(*td), GFP_KERNEL, md->numa_node_id); |
86f1152b BM |
667 | if (!td) { |
668 | mutex_unlock(&md->table_devices_lock); | |
669 | return -ENOMEM; | |
670 | } | |
671 | ||
672 | td->dm_dev.mode = mode; | |
673 | td->dm_dev.bdev = NULL; | |
674 | ||
675 | if ((r = open_table_device(td, dev, md))) { | |
676 | mutex_unlock(&md->table_devices_lock); | |
677 | kfree(td); | |
678 | return r; | |
679 | } | |
680 | ||
681 | format_dev_t(td->dm_dev.name, dev); | |
682 | ||
683 | atomic_set(&td->count, 0); | |
684 | list_add(&td->list, &md->table_devices); | |
685 | } | |
686 | atomic_inc(&td->count); | |
687 | mutex_unlock(&md->table_devices_lock); | |
688 | ||
689 | *result = &td->dm_dev; | |
690 | return 0; | |
691 | } | |
692 | EXPORT_SYMBOL_GPL(dm_get_table_device); | |
693 | ||
694 | void dm_put_table_device(struct mapped_device *md, struct dm_dev *d) | |
695 | { | |
696 | struct table_device *td = container_of(d, struct table_device, dm_dev); | |
697 | ||
698 | mutex_lock(&md->table_devices_lock); | |
699 | if (atomic_dec_and_test(&td->count)) { | |
700 | close_table_device(td, md); | |
701 | list_del(&td->list); | |
702 | kfree(td); | |
703 | } | |
704 | mutex_unlock(&md->table_devices_lock); | |
705 | } | |
706 | EXPORT_SYMBOL(dm_put_table_device); | |
707 | ||
708 | static void free_table_devices(struct list_head *devices) | |
709 | { | |
710 | struct list_head *tmp, *next; | |
711 | ||
712 | list_for_each_safe(tmp, next, devices) { | |
713 | struct table_device *td = list_entry(tmp, struct table_device, list); | |
714 | ||
715 | DMWARN("dm_destroy: %s still exists with %d references", | |
716 | td->dm_dev.name, atomic_read(&td->count)); | |
717 | kfree(td); | |
718 | } | |
719 | } | |
720 | ||
3ac51e74 DW |
721 | /* |
722 | * Get the geometry associated with a dm device | |
723 | */ | |
724 | int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo) | |
725 | { | |
726 | *geo = md->geometry; | |
727 | ||
728 | return 0; | |
729 | } | |
730 | ||
731 | /* | |
732 | * Set the geometry of a device. | |
733 | */ | |
734 | int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo) | |
735 | { | |
736 | sector_t sz = (sector_t)geo->cylinders * geo->heads * geo->sectors; | |
737 | ||
738 | if (geo->start > sz) { | |
739 | DMWARN("Start sector is beyond the geometry limits."); | |
740 | return -EINVAL; | |
741 | } | |
742 | ||
743 | md->geometry = *geo; | |
744 | ||
745 | return 0; | |
746 | } | |
747 | ||
1da177e4 LT |
748 | /*----------------------------------------------------------------- |
749 | * CRUD START: | |
750 | * A more elegant soln is in the works that uses the queue | |
751 | * merge fn, unfortunately there are a couple of changes to | |
752 | * the block layer that I want to make for this. So in the | |
753 | * interests of getting something for people to use I give | |
754 | * you this clearly demarcated crap. | |
755 | *---------------------------------------------------------------*/ | |
756 | ||
2e93ccc1 KU |
757 | static int __noflush_suspending(struct mapped_device *md) |
758 | { | |
759 | return test_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); | |
760 | } | |
761 | ||
1da177e4 LT |
762 | /* |
763 | * Decrements the number of outstanding ios that a bio has been | |
764 | * cloned into, completing the original io if necc. | |
765 | */ | |
858119e1 | 766 | static void dec_pending(struct dm_io *io, int error) |
1da177e4 | 767 | { |
2e93ccc1 | 768 | unsigned long flags; |
b35f8caa MB |
769 | int io_error; |
770 | struct bio *bio; | |
771 | struct mapped_device *md = io->md; | |
2e93ccc1 KU |
772 | |
773 | /* Push-back supersedes any I/O errors */ | |
f88fb981 KU |
774 | if (unlikely(error)) { |
775 | spin_lock_irqsave(&io->endio_lock, flags); | |
776 | if (!(io->error > 0 && __noflush_suspending(md))) | |
777 | io->error = error; | |
778 | spin_unlock_irqrestore(&io->endio_lock, flags); | |
779 | } | |
1da177e4 LT |
780 | |
781 | if (atomic_dec_and_test(&io->io_count)) { | |
2e93ccc1 KU |
782 | if (io->error == DM_ENDIO_REQUEUE) { |
783 | /* | |
784 | * Target requested pushing back the I/O. | |
2e93ccc1 | 785 | */ |
022c2611 | 786 | spin_lock_irqsave(&md->deferred_lock, flags); |
6a8736d1 TH |
787 | if (__noflush_suspending(md)) |
788 | bio_list_add_head(&md->deferred, io->bio); | |
789 | else | |
2e93ccc1 KU |
790 | /* noflush suspend was interrupted. */ |
791 | io->error = -EIO; | |
022c2611 | 792 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
2e93ccc1 KU |
793 | } |
794 | ||
b35f8caa MB |
795 | io_error = io->error; |
796 | bio = io->bio; | |
6a8736d1 TH |
797 | end_io_acct(io); |
798 | free_io(md, io); | |
799 | ||
800 | if (io_error == DM_ENDIO_REQUEUE) | |
801 | return; | |
2e93ccc1 | 802 | |
1eff9d32 | 803 | if ((bio->bi_opf & REQ_PREFLUSH) && bio->bi_iter.bi_size) { |
af7e466a | 804 | /* |
6a8736d1 | 805 | * Preflush done for flush with data, reissue |
28a8f0d3 | 806 | * without REQ_PREFLUSH. |
af7e466a | 807 | */ |
1eff9d32 | 808 | bio->bi_opf &= ~REQ_PREFLUSH; |
6a8736d1 | 809 | queue_io(md, bio); |
af7e466a | 810 | } else { |
b372d360 | 811 | /* done with normal IO or empty flush */ |
0a82a8d1 | 812 | trace_block_bio_complete(md->queue, bio, io_error); |
4246a0b6 CH |
813 | bio->bi_error = io_error; |
814 | bio_endio(bio); | |
b35f8caa | 815 | } |
1da177e4 LT |
816 | } |
817 | } | |
818 | ||
4cc96131 | 819 | void disable_write_same(struct mapped_device *md) |
7eee4ae2 MS |
820 | { |
821 | struct queue_limits *limits = dm_get_queue_limits(md); | |
822 | ||
823 | /* device doesn't really support WRITE SAME, disable it */ | |
824 | limits->max_write_same_sectors = 0; | |
825 | } | |
826 | ||
4246a0b6 | 827 | static void clone_endio(struct bio *bio) |
1da177e4 | 828 | { |
4246a0b6 | 829 | int error = bio->bi_error; |
5164bece | 830 | int r = error; |
bfc6d41c | 831 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); |
b35f8caa | 832 | struct dm_io *io = tio->io; |
9faf400f | 833 | struct mapped_device *md = tio->io->md; |
1da177e4 LT |
834 | dm_endio_fn endio = tio->ti->type->end_io; |
835 | ||
1da177e4 | 836 | if (endio) { |
7de3ee57 | 837 | r = endio(tio->ti, bio, error); |
2e93ccc1 KU |
838 | if (r < 0 || r == DM_ENDIO_REQUEUE) |
839 | /* | |
840 | * error and requeue request are handled | |
841 | * in dec_pending(). | |
842 | */ | |
1da177e4 | 843 | error = r; |
45cbcd79 KU |
844 | else if (r == DM_ENDIO_INCOMPLETE) |
845 | /* The target will handle the io */ | |
6712ecf8 | 846 | return; |
45cbcd79 KU |
847 | else if (r) { |
848 | DMWARN("unimplemented target endio return value: %d", r); | |
849 | BUG(); | |
850 | } | |
1da177e4 LT |
851 | } |
852 | ||
e6047149 | 853 | if (unlikely(r == -EREMOTEIO && (bio_op(bio) == REQ_OP_WRITE_SAME) && |
7eee4ae2 MS |
854 | !bdev_get_queue(bio->bi_bdev)->limits.max_write_same_sectors)) |
855 | disable_write_same(md); | |
856 | ||
cfae7529 | 857 | free_tio(tio); |
b35f8caa | 858 | dec_pending(io, error); |
1da177e4 LT |
859 | } |
860 | ||
56a67df7 MS |
861 | /* |
862 | * Return maximum size of I/O possible at the supplied sector up to the current | |
863 | * target boundary. | |
864 | */ | |
865 | static sector_t max_io_len_target_boundary(sector_t sector, struct dm_target *ti) | |
866 | { | |
867 | sector_t target_offset = dm_target_offset(ti, sector); | |
868 | ||
869 | return ti->len - target_offset; | |
870 | } | |
871 | ||
872 | static sector_t max_io_len(sector_t sector, struct dm_target *ti) | |
1da177e4 | 873 | { |
56a67df7 | 874 | sector_t len = max_io_len_target_boundary(sector, ti); |
542f9038 | 875 | sector_t offset, max_len; |
1da177e4 LT |
876 | |
877 | /* | |
542f9038 | 878 | * Does the target need to split even further? |
1da177e4 | 879 | */ |
542f9038 MS |
880 | if (ti->max_io_len) { |
881 | offset = dm_target_offset(ti, sector); | |
882 | if (unlikely(ti->max_io_len & (ti->max_io_len - 1))) | |
883 | max_len = sector_div(offset, ti->max_io_len); | |
884 | else | |
885 | max_len = offset & (ti->max_io_len - 1); | |
886 | max_len = ti->max_io_len - max_len; | |
887 | ||
888 | if (len > max_len) | |
889 | len = max_len; | |
1da177e4 LT |
890 | } |
891 | ||
892 | return len; | |
893 | } | |
894 | ||
542f9038 MS |
895 | int dm_set_target_max_io_len(struct dm_target *ti, sector_t len) |
896 | { | |
897 | if (len > UINT_MAX) { | |
898 | DMERR("Specified maximum size of target IO (%llu) exceeds limit (%u)", | |
899 | (unsigned long long)len, UINT_MAX); | |
900 | ti->error = "Maximum size of target IO is too large"; | |
901 | return -EINVAL; | |
902 | } | |
903 | ||
904 | ti->max_io_len = (uint32_t) len; | |
905 | ||
906 | return 0; | |
907 | } | |
908 | EXPORT_SYMBOL_GPL(dm_set_target_max_io_len); | |
909 | ||
545ed20e | 910 | static long dm_blk_direct_access(struct block_device *bdev, sector_t sector, |
f0c98ebc | 911 | void **kaddr, pfn_t *pfn, long size) |
545ed20e TK |
912 | { |
913 | struct mapped_device *md = bdev->bd_disk->private_data; | |
914 | struct dm_table *map; | |
915 | struct dm_target *ti; | |
916 | int srcu_idx; | |
917 | long len, ret = -EIO; | |
918 | ||
919 | map = dm_get_live_table(md, &srcu_idx); | |
920 | if (!map) | |
921 | goto out; | |
922 | ||
923 | ti = dm_table_find_target(map, sector); | |
924 | if (!dm_target_is_valid(ti)) | |
925 | goto out; | |
926 | ||
927 | len = max_io_len(sector, ti) << SECTOR_SHIFT; | |
928 | size = min(len, size); | |
929 | ||
930 | if (ti->type->direct_access) | |
931 | ret = ti->type->direct_access(ti, sector, kaddr, pfn, size); | |
932 | out: | |
933 | dm_put_live_table(md, srcu_idx); | |
934 | return min(ret, size); | |
935 | } | |
936 | ||
1dd40c3e MP |
937 | /* |
938 | * A target may call dm_accept_partial_bio only from the map routine. It is | |
28a8f0d3 | 939 | * allowed for all bio types except REQ_PREFLUSH. |
1dd40c3e MP |
940 | * |
941 | * dm_accept_partial_bio informs the dm that the target only wants to process | |
942 | * additional n_sectors sectors of the bio and the rest of the data should be | |
943 | * sent in a next bio. | |
944 | * | |
945 | * A diagram that explains the arithmetics: | |
946 | * +--------------------+---------------+-------+ | |
947 | * | 1 | 2 | 3 | | |
948 | * +--------------------+---------------+-------+ | |
949 | * | |
950 | * <-------------- *tio->len_ptr ---------------> | |
951 | * <------- bi_size -------> | |
952 | * <-- n_sectors --> | |
953 | * | |
954 | * Region 1 was already iterated over with bio_advance or similar function. | |
955 | * (it may be empty if the target doesn't use bio_advance) | |
956 | * Region 2 is the remaining bio size that the target wants to process. | |
957 | * (it may be empty if region 1 is non-empty, although there is no reason | |
958 | * to make it empty) | |
959 | * The target requires that region 3 is to be sent in the next bio. | |
960 | * | |
961 | * If the target wants to receive multiple copies of the bio (via num_*bios, etc), | |
962 | * the partially processed part (the sum of regions 1+2) must be the same for all | |
963 | * copies of the bio. | |
964 | */ | |
965 | void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors) | |
966 | { | |
967 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); | |
968 | unsigned bi_size = bio->bi_iter.bi_size >> SECTOR_SHIFT; | |
1eff9d32 | 969 | BUG_ON(bio->bi_opf & REQ_PREFLUSH); |
1dd40c3e MP |
970 | BUG_ON(bi_size > *tio->len_ptr); |
971 | BUG_ON(n_sectors > bi_size); | |
972 | *tio->len_ptr -= bi_size - n_sectors; | |
973 | bio->bi_iter.bi_size = n_sectors << SECTOR_SHIFT; | |
974 | } | |
975 | EXPORT_SYMBOL_GPL(dm_accept_partial_bio); | |
976 | ||
d67a5f4b MP |
977 | /* |
978 | * Flush current->bio_list when the target map method blocks. | |
979 | * This fixes deadlocks in snapshot and possibly in other targets. | |
980 | */ | |
981 | struct dm_offload { | |
982 | struct blk_plug plug; | |
983 | struct blk_plug_cb cb; | |
984 | }; | |
985 | ||
986 | static void flush_current_bio_list(struct blk_plug_cb *cb, bool from_schedule) | |
987 | { | |
988 | struct dm_offload *o = container_of(cb, struct dm_offload, cb); | |
989 | struct bio_list list; | |
990 | struct bio *bio; | |
991 | ||
992 | INIT_LIST_HEAD(&o->cb.list); | |
993 | ||
994 | if (unlikely(!current->bio_list)) | |
995 | return; | |
996 | ||
997 | list = *current->bio_list; | |
998 | bio_list_init(current->bio_list); | |
999 | ||
1000 | while ((bio = bio_list_pop(&list))) { | |
1001 | struct bio_set *bs = bio->bi_pool; | |
1002 | if (unlikely(!bs) || bs == fs_bio_set) { | |
1003 | bio_list_add(current->bio_list, bio); | |
1004 | continue; | |
1005 | } | |
1006 | ||
1007 | spin_lock(&bs->rescue_lock); | |
1008 | bio_list_add(&bs->rescue_list, bio); | |
1009 | queue_work(bs->rescue_workqueue, &bs->rescue_work); | |
1010 | spin_unlock(&bs->rescue_lock); | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | static void dm_offload_start(struct dm_offload *o) | |
1015 | { | |
1016 | blk_start_plug(&o->plug); | |
1017 | o->cb.callback = flush_current_bio_list; | |
1018 | list_add(&o->cb.list, ¤t->plug->cb_list); | |
1019 | } | |
1020 | ||
1021 | static void dm_offload_end(struct dm_offload *o) | |
1022 | { | |
1023 | list_del(&o->cb.list); | |
1024 | blk_finish_plug(&o->plug); | |
1025 | } | |
1026 | ||
bd2a49b8 | 1027 | static void __map_bio(struct dm_target_io *tio) |
1da177e4 LT |
1028 | { |
1029 | int r; | |
2056a782 | 1030 | sector_t sector; |
d67a5f4b | 1031 | struct dm_offload o; |
dba14160 | 1032 | struct bio *clone = &tio->clone; |
bd2a49b8 | 1033 | struct dm_target *ti = tio->ti; |
1da177e4 | 1034 | |
1da177e4 | 1035 | clone->bi_end_io = clone_endio; |
1da177e4 LT |
1036 | |
1037 | /* | |
1038 | * Map the clone. If r == 0 we don't need to do | |
1039 | * anything, the target has assumed ownership of | |
1040 | * this io. | |
1041 | */ | |
1042 | atomic_inc(&tio->io->io_count); | |
4f024f37 | 1043 | sector = clone->bi_iter.bi_sector; |
d67a5f4b MP |
1044 | |
1045 | dm_offload_start(&o); | |
7de3ee57 | 1046 | r = ti->type->map(ti, clone); |
d67a5f4b MP |
1047 | dm_offload_end(&o); |
1048 | ||
45cbcd79 | 1049 | if (r == DM_MAPIO_REMAPPED) { |
1da177e4 | 1050 | /* the bio has been remapped so dispatch it */ |
2056a782 | 1051 | |
d07335e5 MS |
1052 | trace_block_bio_remap(bdev_get_queue(clone->bi_bdev), clone, |
1053 | tio->io->bio->bi_bdev->bd_dev, sector); | |
2056a782 | 1054 | |
1da177e4 | 1055 | generic_make_request(clone); |
2e93ccc1 KU |
1056 | } else if (r < 0 || r == DM_MAPIO_REQUEUE) { |
1057 | /* error the io and bail out, or requeue it if needed */ | |
9faf400f | 1058 | dec_pending(tio->io, r); |
cfae7529 | 1059 | free_tio(tio); |
ab37844d | 1060 | } else if (r != DM_MAPIO_SUBMITTED) { |
45cbcd79 KU |
1061 | DMWARN("unimplemented target map return value: %d", r); |
1062 | BUG(); | |
1da177e4 LT |
1063 | } |
1064 | } | |
1065 | ||
1066 | struct clone_info { | |
1067 | struct mapped_device *md; | |
1068 | struct dm_table *map; | |
1069 | struct bio *bio; | |
1070 | struct dm_io *io; | |
1071 | sector_t sector; | |
e0d6609a | 1072 | unsigned sector_count; |
1da177e4 LT |
1073 | }; |
1074 | ||
e0d6609a | 1075 | static void bio_setup_sector(struct bio *bio, sector_t sector, unsigned len) |
bd2a49b8 | 1076 | { |
4f024f37 KO |
1077 | bio->bi_iter.bi_sector = sector; |
1078 | bio->bi_iter.bi_size = to_bytes(len); | |
1da177e4 LT |
1079 | } |
1080 | ||
1081 | /* | |
1082 | * Creates a bio that consists of range of complete bvecs. | |
1083 | */ | |
c80914e8 MS |
1084 | static int clone_bio(struct dm_target_io *tio, struct bio *bio, |
1085 | sector_t sector, unsigned len) | |
1da177e4 | 1086 | { |
dba14160 | 1087 | struct bio *clone = &tio->clone; |
1da177e4 | 1088 | |
1c3b13e6 KO |
1089 | __bio_clone_fast(clone, bio); |
1090 | ||
c80914e8 MS |
1091 | if (bio_integrity(bio)) { |
1092 | int r = bio_integrity_clone(clone, bio, GFP_NOIO); | |
1093 | if (r < 0) | |
1094 | return r; | |
1095 | } | |
bd2a49b8 | 1096 | |
1c3b13e6 KO |
1097 | bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector)); |
1098 | clone->bi_iter.bi_size = to_bytes(len); | |
1099 | ||
1100 | if (bio_integrity(bio)) | |
1101 | bio_integrity_trim(clone, 0, len); | |
c80914e8 MS |
1102 | |
1103 | return 0; | |
1da177e4 LT |
1104 | } |
1105 | ||
9015df24 | 1106 | static struct dm_target_io *alloc_tio(struct clone_info *ci, |
99778273 | 1107 | struct dm_target *ti, |
55a62eef | 1108 | unsigned target_bio_nr) |
f9ab94ce | 1109 | { |
dba14160 MP |
1110 | struct dm_target_io *tio; |
1111 | struct bio *clone; | |
1112 | ||
99778273 | 1113 | clone = bio_alloc_bioset(GFP_NOIO, 0, ci->md->bs); |
dba14160 | 1114 | tio = container_of(clone, struct dm_target_io, clone); |
f9ab94ce MP |
1115 | |
1116 | tio->io = ci->io; | |
1117 | tio->ti = ti; | |
55a62eef | 1118 | tio->target_bio_nr = target_bio_nr; |
9015df24 AK |
1119 | |
1120 | return tio; | |
1121 | } | |
1122 | ||
14fe594d AK |
1123 | static void __clone_and_map_simple_bio(struct clone_info *ci, |
1124 | struct dm_target *ti, | |
1dd40c3e | 1125 | unsigned target_bio_nr, unsigned *len) |
9015df24 | 1126 | { |
99778273 | 1127 | struct dm_target_io *tio = alloc_tio(ci, ti, target_bio_nr); |
dba14160 | 1128 | struct bio *clone = &tio->clone; |
9015df24 | 1129 | |
1dd40c3e MP |
1130 | tio->len_ptr = len; |
1131 | ||
99778273 | 1132 | __bio_clone_fast(clone, ci->bio); |
bd2a49b8 | 1133 | if (len) |
1dd40c3e | 1134 | bio_setup_sector(clone, ci->sector, *len); |
f9ab94ce | 1135 | |
bd2a49b8 | 1136 | __map_bio(tio); |
f9ab94ce MP |
1137 | } |
1138 | ||
14fe594d | 1139 | static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti, |
1dd40c3e | 1140 | unsigned num_bios, unsigned *len) |
06a426ce | 1141 | { |
55a62eef | 1142 | unsigned target_bio_nr; |
06a426ce | 1143 | |
55a62eef | 1144 | for (target_bio_nr = 0; target_bio_nr < num_bios; target_bio_nr++) |
14fe594d | 1145 | __clone_and_map_simple_bio(ci, ti, target_bio_nr, len); |
06a426ce MS |
1146 | } |
1147 | ||
14fe594d | 1148 | static int __send_empty_flush(struct clone_info *ci) |
f9ab94ce | 1149 | { |
06a426ce | 1150 | unsigned target_nr = 0; |
f9ab94ce MP |
1151 | struct dm_target *ti; |
1152 | ||
b372d360 | 1153 | BUG_ON(bio_has_data(ci->bio)); |
f9ab94ce | 1154 | while ((ti = dm_table_get_target(ci->map, target_nr++))) |
1dd40c3e | 1155 | __send_duplicate_bios(ci, ti, ti->num_flush_bios, NULL); |
f9ab94ce | 1156 | |
f9ab94ce MP |
1157 | return 0; |
1158 | } | |
1159 | ||
c80914e8 | 1160 | static int __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti, |
1dd40c3e | 1161 | sector_t sector, unsigned *len) |
5ae89a87 | 1162 | { |
dba14160 | 1163 | struct bio *bio = ci->bio; |
5ae89a87 | 1164 | struct dm_target_io *tio; |
b0d8ed4d AK |
1165 | unsigned target_bio_nr; |
1166 | unsigned num_target_bios = 1; | |
c80914e8 | 1167 | int r = 0; |
5ae89a87 | 1168 | |
b0d8ed4d AK |
1169 | /* |
1170 | * Does the target want to receive duplicate copies of the bio? | |
1171 | */ | |
1172 | if (bio_data_dir(bio) == WRITE && ti->num_write_bios) | |
1173 | num_target_bios = ti->num_write_bios(ti, bio); | |
e4c93811 | 1174 | |
b0d8ed4d | 1175 | for (target_bio_nr = 0; target_bio_nr < num_target_bios; target_bio_nr++) { |
99778273 | 1176 | tio = alloc_tio(ci, ti, target_bio_nr); |
1dd40c3e | 1177 | tio->len_ptr = len; |
c80914e8 | 1178 | r = clone_bio(tio, bio, sector, *len); |
072623de | 1179 | if (r < 0) { |
cfae7529 | 1180 | free_tio(tio); |
c80914e8 | 1181 | break; |
072623de | 1182 | } |
b0d8ed4d AK |
1183 | __map_bio(tio); |
1184 | } | |
c80914e8 MS |
1185 | |
1186 | return r; | |
5ae89a87 MS |
1187 | } |
1188 | ||
55a62eef | 1189 | typedef unsigned (*get_num_bios_fn)(struct dm_target *ti); |
23508a96 | 1190 | |
55a62eef | 1191 | static unsigned get_num_discard_bios(struct dm_target *ti) |
23508a96 | 1192 | { |
55a62eef | 1193 | return ti->num_discard_bios; |
23508a96 MS |
1194 | } |
1195 | ||
55a62eef | 1196 | static unsigned get_num_write_same_bios(struct dm_target *ti) |
23508a96 | 1197 | { |
55a62eef | 1198 | return ti->num_write_same_bios; |
23508a96 MS |
1199 | } |
1200 | ||
1201 | typedef bool (*is_split_required_fn)(struct dm_target *ti); | |
9eef87da | 1202 | |
23508a96 MS |
1203 | static bool is_split_required_for_discard(struct dm_target *ti) |
1204 | { | |
55a62eef | 1205 | return ti->split_discard_bios; |
cec47e3d KU |
1206 | } |
1207 | ||
14fe594d AK |
1208 | static int __send_changing_extent_only(struct clone_info *ci, |
1209 | get_num_bios_fn get_num_bios, | |
1210 | is_split_required_fn is_split_required) | |
ba1cbad9 | 1211 | { |
5ae89a87 | 1212 | struct dm_target *ti; |
e0d6609a | 1213 | unsigned len; |
55a62eef | 1214 | unsigned num_bios; |
ba1cbad9 | 1215 | |
a79245b3 MS |
1216 | do { |
1217 | ti = dm_table_find_target(ci->map, ci->sector); | |
1218 | if (!dm_target_is_valid(ti)) | |
1219 | return -EIO; | |
2eb6e1e3 | 1220 | |
5ae89a87 | 1221 | /* |
23508a96 MS |
1222 | * Even though the device advertised support for this type of |
1223 | * request, that does not mean every target supports it, and | |
936688d7 | 1224 | * reconfiguration might also have changed that since the |
a79245b3 | 1225 | * check was performed. |
5ae89a87 | 1226 | */ |
55a62eef AK |
1227 | num_bios = get_num_bios ? get_num_bios(ti) : 0; |
1228 | if (!num_bios) | |
a79245b3 | 1229 | return -EOPNOTSUPP; |
ba1cbad9 | 1230 | |
23508a96 | 1231 | if (is_split_required && !is_split_required(ti)) |
e0d6609a | 1232 | len = min((sector_t)ci->sector_count, max_io_len_target_boundary(ci->sector, ti)); |
7acf0277 | 1233 | else |
e0d6609a | 1234 | len = min((sector_t)ci->sector_count, max_io_len(ci->sector, ti)); |
de3ec86d | 1235 | |
1dd40c3e | 1236 | __send_duplicate_bios(ci, ti, num_bios, &len); |
e262f347 | 1237 | |
a79245b3 MS |
1238 | ci->sector += len; |
1239 | } while (ci->sector_count -= len); | |
5ae89a87 MS |
1240 | |
1241 | return 0; | |
ba1cbad9 MS |
1242 | } |
1243 | ||
14fe594d | 1244 | static int __send_discard(struct clone_info *ci) |
23508a96 | 1245 | { |
14fe594d AK |
1246 | return __send_changing_extent_only(ci, get_num_discard_bios, |
1247 | is_split_required_for_discard); | |
23508a96 | 1248 | } |
0ce65797 | 1249 | |
14fe594d | 1250 | static int __send_write_same(struct clone_info *ci) |
0ce65797 | 1251 | { |
14fe594d | 1252 | return __send_changing_extent_only(ci, get_num_write_same_bios, NULL); |
0ce65797 MS |
1253 | } |
1254 | ||
e4c93811 AK |
1255 | /* |
1256 | * Select the correct strategy for processing a non-flush bio. | |
1257 | */ | |
14fe594d | 1258 | static int __split_and_process_non_flush(struct clone_info *ci) |
0ce65797 | 1259 | { |
dba14160 | 1260 | struct bio *bio = ci->bio; |
512875bd | 1261 | struct dm_target *ti; |
1c3b13e6 | 1262 | unsigned len; |
c80914e8 | 1263 | int r; |
0ce65797 | 1264 | |
e6047149 | 1265 | if (unlikely(bio_op(bio) == REQ_OP_DISCARD)) |
14fe594d | 1266 | return __send_discard(ci); |
e6047149 | 1267 | else if (unlikely(bio_op(bio) == REQ_OP_WRITE_SAME)) |
14fe594d | 1268 | return __send_write_same(ci); |
0ce65797 | 1269 | |
512875bd JN |
1270 | ti = dm_table_find_target(ci->map, ci->sector); |
1271 | if (!dm_target_is_valid(ti)) | |
1272 | return -EIO; | |
1273 | ||
1c3b13e6 | 1274 | len = min_t(sector_t, max_io_len(ci->sector, ti), ci->sector_count); |
0ce65797 | 1275 | |
c80914e8 MS |
1276 | r = __clone_and_map_data_bio(ci, ti, ci->sector, &len); |
1277 | if (r < 0) | |
1278 | return r; | |
0ce65797 | 1279 | |
1c3b13e6 KO |
1280 | ci->sector += len; |
1281 | ci->sector_count -= len; | |
0ce65797 | 1282 | |
1c3b13e6 | 1283 | return 0; |
0ce65797 MS |
1284 | } |
1285 | ||
1da177e4 | 1286 | /* |
14fe594d | 1287 | * Entry point to split a bio into clones and submit them to the targets. |
1da177e4 | 1288 | */ |
83d5e5b0 MP |
1289 | static void __split_and_process_bio(struct mapped_device *md, |
1290 | struct dm_table *map, struct bio *bio) | |
0ce65797 | 1291 | { |
1da177e4 | 1292 | struct clone_info ci; |
512875bd | 1293 | int error = 0; |
1da177e4 | 1294 | |
83d5e5b0 | 1295 | if (unlikely(!map)) { |
6a8736d1 | 1296 | bio_io_error(bio); |
f0b9a450 MP |
1297 | return; |
1298 | } | |
692d0eb9 | 1299 | |
83d5e5b0 | 1300 | ci.map = map; |
1da177e4 | 1301 | ci.md = md; |
1da177e4 LT |
1302 | ci.io = alloc_io(md); |
1303 | ci.io->error = 0; | |
1304 | atomic_set(&ci.io->io_count, 1); | |
1305 | ci.io->bio = bio; | |
1306 | ci.io->md = md; | |
f88fb981 | 1307 | spin_lock_init(&ci.io->endio_lock); |
4f024f37 | 1308 | ci.sector = bio->bi_iter.bi_sector; |
0ce65797 | 1309 | |
3eaf840e | 1310 | start_io_acct(ci.io); |
0ce65797 | 1311 | |
1eff9d32 | 1312 | if (bio->bi_opf & REQ_PREFLUSH) { |
b372d360 MS |
1313 | ci.bio = &ci.md->flush_bio; |
1314 | ci.sector_count = 0; | |
14fe594d | 1315 | error = __send_empty_flush(&ci); |
b372d360 MS |
1316 | /* dec_pending submits any data associated with flush */ |
1317 | } else { | |
6a8736d1 | 1318 | ci.bio = bio; |
d87f4c14 | 1319 | ci.sector_count = bio_sectors(bio); |
b372d360 | 1320 | while (ci.sector_count && !error) |
14fe594d | 1321 | error = __split_and_process_non_flush(&ci); |
d87f4c14 | 1322 | } |
0ce65797 | 1323 | |
1da177e4 | 1324 | /* drop the extra reference count */ |
512875bd | 1325 | dec_pending(ci.io, error); |
0ce65797 | 1326 | } |
1da177e4 LT |
1327 | /*----------------------------------------------------------------- |
1328 | * CRUD END | |
1329 | *---------------------------------------------------------------*/ | |
0ce65797 | 1330 | |
cec47e3d | 1331 | /* |
1da177e4 LT |
1332 | * The request function that just remaps the bio built up by |
1333 | * dm_merge_bvec. | |
cec47e3d | 1334 | */ |
dece1635 | 1335 | static blk_qc_t dm_make_request(struct request_queue *q, struct bio *bio) |
cec47e3d | 1336 | { |
12f03a49 | 1337 | int rw = bio_data_dir(bio); |
cec47e3d | 1338 | struct mapped_device *md = q->queuedata; |
83d5e5b0 MP |
1339 | int srcu_idx; |
1340 | struct dm_table *map; | |
cec47e3d | 1341 | |
83d5e5b0 | 1342 | map = dm_get_live_table(md, &srcu_idx); |
29e4013d | 1343 | |
18c0b223 | 1344 | generic_start_io_acct(rw, bio_sectors(bio), &dm_disk(md)->part0); |
d0bcb878 | 1345 | |
6a8736d1 TH |
1346 | /* if we're suspended, we have to queue this io for later */ |
1347 | if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags))) { | |
83d5e5b0 | 1348 | dm_put_live_table(md, srcu_idx); |
9eef87da | 1349 | |
1eff9d32 | 1350 | if (!(bio->bi_opf & REQ_RAHEAD)) |
6a8736d1 TH |
1351 | queue_io(md, bio); |
1352 | else | |
54d9a1b4 | 1353 | bio_io_error(bio); |
dece1635 | 1354 | return BLK_QC_T_NONE; |
cec47e3d | 1355 | } |
1da177e4 | 1356 | |
83d5e5b0 MP |
1357 | __split_and_process_bio(md, map, bio); |
1358 | dm_put_live_table(md, srcu_idx); | |
dece1635 | 1359 | return BLK_QC_T_NONE; |
cec47e3d KU |
1360 | } |
1361 | ||
1da177e4 LT |
1362 | static int dm_any_congested(void *congested_data, int bdi_bits) |
1363 | { | |
8a57dfc6 CS |
1364 | int r = bdi_bits; |
1365 | struct mapped_device *md = congested_data; | |
1366 | struct dm_table *map; | |
1da177e4 | 1367 | |
1eb787ec | 1368 | if (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) { |
e522c039 | 1369 | if (dm_request_based(md)) { |
cec47e3d | 1370 | /* |
e522c039 MS |
1371 | * With request-based DM we only need to check the |
1372 | * top-level queue for congestion. | |
cec47e3d | 1373 | */ |
dc3b17cc | 1374 | r = md->queue->backing_dev_info->wb.state & bdi_bits; |
e522c039 MS |
1375 | } else { |
1376 | map = dm_get_live_table_fast(md); | |
1377 | if (map) | |
cec47e3d | 1378 | r = dm_table_any_congested(map, bdi_bits); |
e522c039 | 1379 | dm_put_live_table_fast(md); |
8a57dfc6 CS |
1380 | } |
1381 | } | |
1382 | ||
1da177e4 LT |
1383 | return r; |
1384 | } | |
1385 | ||
1386 | /*----------------------------------------------------------------- | |
1387 | * An IDR is used to keep track of allocated minor numbers. | |
1388 | *---------------------------------------------------------------*/ | |
2b06cfff | 1389 | static void free_minor(int minor) |
1da177e4 | 1390 | { |
f32c10b0 | 1391 | spin_lock(&_minor_lock); |
1da177e4 | 1392 | idr_remove(&_minor_idr, minor); |
f32c10b0 | 1393 | spin_unlock(&_minor_lock); |
1da177e4 LT |
1394 | } |
1395 | ||
1396 | /* | |
1397 | * See if the device with a specific minor # is free. | |
1398 | */ | |
cf13ab8e | 1399 | static int specific_minor(int minor) |
1da177e4 | 1400 | { |
c9d76be6 | 1401 | int r; |
1da177e4 LT |
1402 | |
1403 | if (minor >= (1 << MINORBITS)) | |
1404 | return -EINVAL; | |
1405 | ||
c9d76be6 | 1406 | idr_preload(GFP_KERNEL); |
f32c10b0 | 1407 | spin_lock(&_minor_lock); |
1da177e4 | 1408 | |
c9d76be6 | 1409 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, minor, minor + 1, GFP_NOWAIT); |
1da177e4 | 1410 | |
f32c10b0 | 1411 | spin_unlock(&_minor_lock); |
c9d76be6 TH |
1412 | idr_preload_end(); |
1413 | if (r < 0) | |
1414 | return r == -ENOSPC ? -EBUSY : r; | |
1415 | return 0; | |
1da177e4 LT |
1416 | } |
1417 | ||
cf13ab8e | 1418 | static int next_free_minor(int *minor) |
1da177e4 | 1419 | { |
c9d76be6 | 1420 | int r; |
62f75c2f | 1421 | |
c9d76be6 | 1422 | idr_preload(GFP_KERNEL); |
f32c10b0 | 1423 | spin_lock(&_minor_lock); |
1da177e4 | 1424 | |
c9d76be6 | 1425 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, 0, 1 << MINORBITS, GFP_NOWAIT); |
1da177e4 | 1426 | |
f32c10b0 | 1427 | spin_unlock(&_minor_lock); |
c9d76be6 TH |
1428 | idr_preload_end(); |
1429 | if (r < 0) | |
1430 | return r; | |
1431 | *minor = r; | |
1432 | return 0; | |
1da177e4 LT |
1433 | } |
1434 | ||
83d5cde4 | 1435 | static const struct block_device_operations dm_blk_dops; |
1da177e4 | 1436 | |
53d5914f MP |
1437 | static void dm_wq_work(struct work_struct *work); |
1438 | ||
4cc96131 | 1439 | void dm_init_md_queue(struct mapped_device *md) |
4a0b4ddf MS |
1440 | { |
1441 | /* | |
1442 | * Request-based dm devices cannot be stacked on top of bio-based dm | |
bfebd1cd | 1443 | * devices. The type of this dm device may not have been decided yet. |
4a0b4ddf MS |
1444 | * The type is decided at the first table loading time. |
1445 | * To prevent problematic device stacking, clear the queue flag | |
1446 | * for request stacking support until then. | |
1447 | * | |
1448 | * This queue is new, so no concurrency on the queue_flags. | |
1449 | */ | |
1450 | queue_flag_clear_unlocked(QUEUE_FLAG_STACKABLE, md->queue); | |
ad5f498f MP |
1451 | |
1452 | /* | |
1453 | * Initialize data that will only be used by a non-blk-mq DM queue | |
1454 | * - must do so here (in alloc_dev callchain) before queue is used | |
1455 | */ | |
1456 | md->queue->queuedata = md; | |
dc3b17cc | 1457 | md->queue->backing_dev_info->congested_data = md; |
bfebd1cd | 1458 | } |
4a0b4ddf | 1459 | |
4cc96131 | 1460 | void dm_init_normal_md_queue(struct mapped_device *md) |
bfebd1cd | 1461 | { |
17e149b8 | 1462 | md->use_blk_mq = false; |
bfebd1cd MS |
1463 | dm_init_md_queue(md); |
1464 | ||
1465 | /* | |
1466 | * Initialize aspects of queue that aren't relevant for blk-mq | |
1467 | */ | |
dc3b17cc | 1468 | md->queue->backing_dev_info->congested_fn = dm_any_congested; |
4a0b4ddf | 1469 | blk_queue_bounce_limit(md->queue, BLK_BOUNCE_ANY); |
4a0b4ddf MS |
1470 | } |
1471 | ||
0f20972f MS |
1472 | static void cleanup_mapped_device(struct mapped_device *md) |
1473 | { | |
0f20972f MS |
1474 | if (md->wq) |
1475 | destroy_workqueue(md->wq); | |
1476 | if (md->kworker_task) | |
1477 | kthread_stop(md->kworker_task); | |
6f65985e | 1478 | mempool_destroy(md->io_pool); |
0f20972f MS |
1479 | if (md->bs) |
1480 | bioset_free(md->bs); | |
1481 | ||
1482 | if (md->disk) { | |
1483 | spin_lock(&_minor_lock); | |
1484 | md->disk->private_data = NULL; | |
1485 | spin_unlock(&_minor_lock); | |
0f20972f MS |
1486 | del_gendisk(md->disk); |
1487 | put_disk(md->disk); | |
1488 | } | |
1489 | ||
1490 | if (md->queue) | |
1491 | blk_cleanup_queue(md->queue); | |
1492 | ||
d09960b0 TE |
1493 | cleanup_srcu_struct(&md->io_barrier); |
1494 | ||
0f20972f MS |
1495 | if (md->bdev) { |
1496 | bdput(md->bdev); | |
1497 | md->bdev = NULL; | |
1498 | } | |
4cc96131 MS |
1499 | |
1500 | dm_mq_cleanup_mapped_device(md); | |
0f20972f MS |
1501 | } |
1502 | ||
1da177e4 LT |
1503 | /* |
1504 | * Allocate and initialise a blank device with a given minor. | |
1505 | */ | |
2b06cfff | 1506 | static struct mapped_device *alloc_dev(int minor) |
1da177e4 | 1507 | { |
115485e8 MS |
1508 | int r, numa_node_id = dm_get_numa_node(); |
1509 | struct mapped_device *md; | |
ba61fdd1 | 1510 | void *old_md; |
1da177e4 | 1511 | |
115485e8 | 1512 | md = kzalloc_node(sizeof(*md), GFP_KERNEL, numa_node_id); |
1da177e4 LT |
1513 | if (!md) { |
1514 | DMWARN("unable to allocate device, out of memory."); | |
1515 | return NULL; | |
1516 | } | |
1517 | ||
10da4f79 | 1518 | if (!try_module_get(THIS_MODULE)) |
6ed7ade8 | 1519 | goto bad_module_get; |
10da4f79 | 1520 | |
1da177e4 | 1521 | /* get a minor number for the dev */ |
2b06cfff | 1522 | if (minor == DM_ANY_MINOR) |
cf13ab8e | 1523 | r = next_free_minor(&minor); |
2b06cfff | 1524 | else |
cf13ab8e | 1525 | r = specific_minor(minor); |
1da177e4 | 1526 | if (r < 0) |
6ed7ade8 | 1527 | goto bad_minor; |
1da177e4 | 1528 | |
83d5e5b0 MP |
1529 | r = init_srcu_struct(&md->io_barrier); |
1530 | if (r < 0) | |
1531 | goto bad_io_barrier; | |
1532 | ||
115485e8 | 1533 | md->numa_node_id = numa_node_id; |
4cc96131 | 1534 | md->use_blk_mq = dm_use_blk_mq_default(); |
591ddcfc | 1535 | md->init_tio_pdu = false; |
a5664dad | 1536 | md->type = DM_TYPE_NONE; |
e61290a4 | 1537 | mutex_init(&md->suspend_lock); |
a5664dad | 1538 | mutex_init(&md->type_lock); |
86f1152b | 1539 | mutex_init(&md->table_devices_lock); |
022c2611 | 1540 | spin_lock_init(&md->deferred_lock); |
1da177e4 | 1541 | atomic_set(&md->holders, 1); |
5c6bd75d | 1542 | atomic_set(&md->open_count, 0); |
1da177e4 | 1543 | atomic_set(&md->event_nr, 0); |
7a8c3d3b MA |
1544 | atomic_set(&md->uevent_seq, 0); |
1545 | INIT_LIST_HEAD(&md->uevent_list); | |
86f1152b | 1546 | INIT_LIST_HEAD(&md->table_devices); |
7a8c3d3b | 1547 | spin_lock_init(&md->uevent_lock); |
1da177e4 | 1548 | |
115485e8 | 1549 | md->queue = blk_alloc_queue_node(GFP_KERNEL, numa_node_id); |
1da177e4 | 1550 | if (!md->queue) |
0f20972f | 1551 | goto bad; |
1da177e4 | 1552 | |
4a0b4ddf | 1553 | dm_init_md_queue(md); |
9faf400f | 1554 | |
115485e8 | 1555 | md->disk = alloc_disk_node(1, numa_node_id); |
1da177e4 | 1556 | if (!md->disk) |
0f20972f | 1557 | goto bad; |
1da177e4 | 1558 | |
316d315b NK |
1559 | atomic_set(&md->pending[0], 0); |
1560 | atomic_set(&md->pending[1], 0); | |
f0b04115 | 1561 | init_waitqueue_head(&md->wait); |
53d5914f | 1562 | INIT_WORK(&md->work, dm_wq_work); |
f0b04115 | 1563 | init_waitqueue_head(&md->eventq); |
2995fa78 | 1564 | init_completion(&md->kobj_holder.completion); |
2eb6e1e3 | 1565 | md->kworker_task = NULL; |
f0b04115 | 1566 | |
1da177e4 LT |
1567 | md->disk->major = _major; |
1568 | md->disk->first_minor = minor; | |
1569 | md->disk->fops = &dm_blk_dops; | |
1570 | md->disk->queue = md->queue; | |
1571 | md->disk->private_data = md; | |
1572 | sprintf(md->disk->disk_name, "dm-%d", minor); | |
1573 | add_disk(md->disk); | |
7e51f257 | 1574 | format_dev_t(md->name, MKDEV(_major, minor)); |
1da177e4 | 1575 | |
670368a8 | 1576 | md->wq = alloc_workqueue("kdmflush", WQ_MEM_RECLAIM, 0); |
304f3f6a | 1577 | if (!md->wq) |
0f20972f | 1578 | goto bad; |
304f3f6a | 1579 | |
32a926da MP |
1580 | md->bdev = bdget_disk(md->disk, 0); |
1581 | if (!md->bdev) | |
0f20972f | 1582 | goto bad; |
32a926da | 1583 | |
3a83f467 | 1584 | bio_init(&md->flush_bio, NULL, 0); |
6a8736d1 | 1585 | md->flush_bio.bi_bdev = md->bdev; |
70fd7614 | 1586 | md->flush_bio.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; |
6a8736d1 | 1587 | |
fd2ed4d2 MP |
1588 | dm_stats_init(&md->stats); |
1589 | ||
ba61fdd1 | 1590 | /* Populate the mapping, nobody knows we exist yet */ |
f32c10b0 | 1591 | spin_lock(&_minor_lock); |
ba61fdd1 | 1592 | old_md = idr_replace(&_minor_idr, md, minor); |
f32c10b0 | 1593 | spin_unlock(&_minor_lock); |
ba61fdd1 JM |
1594 | |
1595 | BUG_ON(old_md != MINOR_ALLOCED); | |
1596 | ||
1da177e4 LT |
1597 | return md; |
1598 | ||
0f20972f MS |
1599 | bad: |
1600 | cleanup_mapped_device(md); | |
83d5e5b0 | 1601 | bad_io_barrier: |
1da177e4 | 1602 | free_minor(minor); |
6ed7ade8 | 1603 | bad_minor: |
10da4f79 | 1604 | module_put(THIS_MODULE); |
6ed7ade8 | 1605 | bad_module_get: |
1da177e4 LT |
1606 | kfree(md); |
1607 | return NULL; | |
1608 | } | |
1609 | ||
ae9da83f JN |
1610 | static void unlock_fs(struct mapped_device *md); |
1611 | ||
1da177e4 LT |
1612 | static void free_dev(struct mapped_device *md) |
1613 | { | |
f331c029 | 1614 | int minor = MINOR(disk_devt(md->disk)); |
63d94e48 | 1615 | |
32a926da | 1616 | unlock_fs(md); |
2eb6e1e3 | 1617 | |
0f20972f | 1618 | cleanup_mapped_device(md); |
63a4f065 | 1619 | |
86f1152b | 1620 | free_table_devices(&md->table_devices); |
63a4f065 | 1621 | dm_stats_cleanup(&md->stats); |
63a4f065 MS |
1622 | free_minor(minor); |
1623 | ||
10da4f79 | 1624 | module_put(THIS_MODULE); |
1da177e4 LT |
1625 | kfree(md); |
1626 | } | |
1627 | ||
e6ee8c0b KU |
1628 | static void __bind_mempools(struct mapped_device *md, struct dm_table *t) |
1629 | { | |
c0820cf5 | 1630 | struct dm_md_mempools *p = dm_table_get_md_mempools(t); |
e6ee8c0b | 1631 | |
4e6e36c3 MS |
1632 | if (md->bs) { |
1633 | /* The md already has necessary mempools. */ | |
545ed20e | 1634 | if (dm_table_bio_based(t)) { |
16245bdc JN |
1635 | /* |
1636 | * Reload bioset because front_pad may have changed | |
1637 | * because a different table was loaded. | |
1638 | */ | |
1639 | bioset_free(md->bs); | |
1640 | md->bs = p->bs; | |
1641 | p->bs = NULL; | |
16245bdc | 1642 | } |
4e6e36c3 MS |
1643 | /* |
1644 | * There's no need to reload with request-based dm | |
1645 | * because the size of front_pad doesn't change. | |
1646 | * Note for future: If you are to reload bioset, | |
1647 | * prep-ed requests in the queue may refer | |
1648 | * to bio from the old bioset, so you must walk | |
1649 | * through the queue to unprep. | |
1650 | */ | |
1651 | goto out; | |
c0820cf5 | 1652 | } |
e6ee8c0b | 1653 | |
eb8db831 | 1654 | BUG_ON(!p || md->io_pool || md->bs); |
cbc4e3c1 | 1655 | |
e6ee8c0b KU |
1656 | md->io_pool = p->io_pool; |
1657 | p->io_pool = NULL; | |
e6ee8c0b KU |
1658 | md->bs = p->bs; |
1659 | p->bs = NULL; | |
4e6e36c3 | 1660 | |
e6ee8c0b | 1661 | out: |
02233342 | 1662 | /* mempool bind completed, no longer need any mempools in the table */ |
e6ee8c0b KU |
1663 | dm_table_free_md_mempools(t); |
1664 | } | |
1665 | ||
1da177e4 LT |
1666 | /* |
1667 | * Bind a table to the device. | |
1668 | */ | |
1669 | static void event_callback(void *context) | |
1670 | { | |
7a8c3d3b MA |
1671 | unsigned long flags; |
1672 | LIST_HEAD(uevents); | |
1da177e4 LT |
1673 | struct mapped_device *md = (struct mapped_device *) context; |
1674 | ||
7a8c3d3b MA |
1675 | spin_lock_irqsave(&md->uevent_lock, flags); |
1676 | list_splice_init(&md->uevent_list, &uevents); | |
1677 | spin_unlock_irqrestore(&md->uevent_lock, flags); | |
1678 | ||
ed9e1982 | 1679 | dm_send_uevents(&uevents, &disk_to_dev(md->disk)->kobj); |
7a8c3d3b | 1680 | |
1da177e4 LT |
1681 | atomic_inc(&md->event_nr); |
1682 | wake_up(&md->eventq); | |
1683 | } | |
1684 | ||
c217649b MS |
1685 | /* |
1686 | * Protected by md->suspend_lock obtained by dm_swap_table(). | |
1687 | */ | |
4e90188b | 1688 | static void __set_size(struct mapped_device *md, sector_t size) |
1da177e4 | 1689 | { |
4e90188b | 1690 | set_capacity(md->disk, size); |
1da177e4 | 1691 | |
db8fef4f | 1692 | i_size_write(md->bdev->bd_inode, (loff_t)size << SECTOR_SHIFT); |
1da177e4 LT |
1693 | } |
1694 | ||
042d2a9b AK |
1695 | /* |
1696 | * Returns old map, which caller must destroy. | |
1697 | */ | |
1698 | static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, | |
1699 | struct queue_limits *limits) | |
1da177e4 | 1700 | { |
042d2a9b | 1701 | struct dm_table *old_map; |
165125e1 | 1702 | struct request_queue *q = md->queue; |
1da177e4 LT |
1703 | sector_t size; |
1704 | ||
5a8f1f80 BVA |
1705 | lockdep_assert_held(&md->suspend_lock); |
1706 | ||
1da177e4 | 1707 | size = dm_table_get_size(t); |
3ac51e74 DW |
1708 | |
1709 | /* | |
1710 | * Wipe any geometry if the size of the table changed. | |
1711 | */ | |
fd2ed4d2 | 1712 | if (size != dm_get_size(md)) |
3ac51e74 DW |
1713 | memset(&md->geometry, 0, sizeof(md->geometry)); |
1714 | ||
32a926da | 1715 | __set_size(md, size); |
d5816876 | 1716 | |
2ca3310e AK |
1717 | dm_table_event_callback(t, event_callback, md); |
1718 | ||
e6ee8c0b KU |
1719 | /* |
1720 | * The queue hasn't been stopped yet, if the old table type wasn't | |
1721 | * for request-based during suspension. So stop it to prevent | |
1722 | * I/O mapping before resume. | |
1723 | * This must be done before setting the queue restrictions, | |
1724 | * because request-based dm may be run just after the setting. | |
1725 | */ | |
16f12266 | 1726 | if (dm_table_request_based(t)) { |
eca7ee6d | 1727 | dm_stop_queue(q); |
16f12266 MS |
1728 | /* |
1729 | * Leverage the fact that request-based DM targets are | |
1730 | * immutable singletons and establish md->immutable_target | |
1731 | * - used to optimize both dm_request_fn and dm_mq_queue_rq | |
1732 | */ | |
1733 | md->immutable_target = dm_table_get_immutable_target(t); | |
1734 | } | |
e6ee8c0b KU |
1735 | |
1736 | __bind_mempools(md, t); | |
1737 | ||
a12f5d48 | 1738 | old_map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
1d3aa6f6 | 1739 | rcu_assign_pointer(md->map, (void *)t); |
36a0456f AK |
1740 | md->immutable_target_type = dm_table_get_immutable_target_type(t); |
1741 | ||
754c5fc7 | 1742 | dm_table_set_restrictions(t, q, limits); |
41abc4e1 HR |
1743 | if (old_map) |
1744 | dm_sync_table(md); | |
1da177e4 | 1745 | |
042d2a9b | 1746 | return old_map; |
1da177e4 LT |
1747 | } |
1748 | ||
a7940155 AK |
1749 | /* |
1750 | * Returns unbound table for the caller to free. | |
1751 | */ | |
1752 | static struct dm_table *__unbind(struct mapped_device *md) | |
1da177e4 | 1753 | { |
a12f5d48 | 1754 | struct dm_table *map = rcu_dereference_protected(md->map, 1); |
1da177e4 LT |
1755 | |
1756 | if (!map) | |
a7940155 | 1757 | return NULL; |
1da177e4 LT |
1758 | |
1759 | dm_table_event_callback(map, NULL, NULL); | |
9cdb8520 | 1760 | RCU_INIT_POINTER(md->map, NULL); |
83d5e5b0 | 1761 | dm_sync_table(md); |
a7940155 AK |
1762 | |
1763 | return map; | |
1da177e4 LT |
1764 | } |
1765 | ||
1766 | /* | |
1767 | * Constructor for a new device. | |
1768 | */ | |
2b06cfff | 1769 | int dm_create(int minor, struct mapped_device **result) |
1da177e4 LT |
1770 | { |
1771 | struct mapped_device *md; | |
1772 | ||
2b06cfff | 1773 | md = alloc_dev(minor); |
1da177e4 LT |
1774 | if (!md) |
1775 | return -ENXIO; | |
1776 | ||
784aae73 MB |
1777 | dm_sysfs_init(md); |
1778 | ||
1da177e4 LT |
1779 | *result = md; |
1780 | return 0; | |
1781 | } | |
1782 | ||
a5664dad MS |
1783 | /* |
1784 | * Functions to manage md->type. | |
1785 | * All are required to hold md->type_lock. | |
1786 | */ | |
1787 | void dm_lock_md_type(struct mapped_device *md) | |
1788 | { | |
1789 | mutex_lock(&md->type_lock); | |
1790 | } | |
1791 | ||
1792 | void dm_unlock_md_type(struct mapped_device *md) | |
1793 | { | |
1794 | mutex_unlock(&md->type_lock); | |
1795 | } | |
1796 | ||
1797 | void dm_set_md_type(struct mapped_device *md, unsigned type) | |
1798 | { | |
00c4fc3b | 1799 | BUG_ON(!mutex_is_locked(&md->type_lock)); |
a5664dad MS |
1800 | md->type = type; |
1801 | } | |
1802 | ||
1803 | unsigned dm_get_md_type(struct mapped_device *md) | |
1804 | { | |
1805 | return md->type; | |
1806 | } | |
1807 | ||
36a0456f AK |
1808 | struct target_type *dm_get_immutable_target_type(struct mapped_device *md) |
1809 | { | |
1810 | return md->immutable_target_type; | |
1811 | } | |
1812 | ||
f84cb8a4 MS |
1813 | /* |
1814 | * The queue_limits are only valid as long as you have a reference | |
1815 | * count on 'md'. | |
1816 | */ | |
1817 | struct queue_limits *dm_get_queue_limits(struct mapped_device *md) | |
1818 | { | |
1819 | BUG_ON(!atomic_read(&md->holders)); | |
1820 | return &md->queue->limits; | |
1821 | } | |
1822 | EXPORT_SYMBOL_GPL(dm_get_queue_limits); | |
1823 | ||
4a0b4ddf MS |
1824 | /* |
1825 | * Setup the DM device's queue based on md's type | |
1826 | */ | |
591ddcfc | 1827 | int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t) |
4a0b4ddf | 1828 | { |
bfebd1cd | 1829 | int r; |
545ed20e | 1830 | unsigned type = dm_get_md_type(md); |
bfebd1cd | 1831 | |
545ed20e | 1832 | switch (type) { |
bfebd1cd | 1833 | case DM_TYPE_REQUEST_BASED: |
eb8db831 | 1834 | r = dm_old_init_request_queue(md, t); |
bfebd1cd | 1835 | if (r) { |
eca7ee6d | 1836 | DMERR("Cannot initialize queue for request-based mapped device"); |
bfebd1cd | 1837 | return r; |
ff36ab34 | 1838 | } |
bfebd1cd MS |
1839 | break; |
1840 | case DM_TYPE_MQ_REQUEST_BASED: | |
e83068a5 | 1841 | r = dm_mq_init_request_queue(md, t); |
bfebd1cd | 1842 | if (r) { |
eca7ee6d | 1843 | DMERR("Cannot initialize queue for request-based dm-mq mapped device"); |
bfebd1cd MS |
1844 | return r; |
1845 | } | |
1846 | break; | |
1847 | case DM_TYPE_BIO_BASED: | |
545ed20e | 1848 | case DM_TYPE_DAX_BIO_BASED: |
eca7ee6d | 1849 | dm_init_normal_md_queue(md); |
ff36ab34 | 1850 | blk_queue_make_request(md->queue, dm_make_request); |
dbba42d8 MP |
1851 | /* |
1852 | * DM handles splitting bios as needed. Free the bio_split bioset | |
1853 | * since it won't be used (saves 1 process per bio-based DM device). | |
1854 | */ | |
1855 | bioset_free(md->queue->bio_split); | |
1856 | md->queue->bio_split = NULL; | |
545ed20e TK |
1857 | |
1858 | if (type == DM_TYPE_DAX_BIO_BASED) | |
1859 | queue_flag_set_unlocked(QUEUE_FLAG_DAX, md->queue); | |
bfebd1cd | 1860 | break; |
4a0b4ddf MS |
1861 | } |
1862 | ||
1863 | return 0; | |
1864 | } | |
1865 | ||
2bec1f4a | 1866 | struct mapped_device *dm_get_md(dev_t dev) |
1da177e4 LT |
1867 | { |
1868 | struct mapped_device *md; | |
1da177e4 LT |
1869 | unsigned minor = MINOR(dev); |
1870 | ||
1871 | if (MAJOR(dev) != _major || minor >= (1 << MINORBITS)) | |
1872 | return NULL; | |
1873 | ||
f32c10b0 | 1874 | spin_lock(&_minor_lock); |
1da177e4 LT |
1875 | |
1876 | md = idr_find(&_minor_idr, minor); | |
2bec1f4a MP |
1877 | if (md) { |
1878 | if ((md == MINOR_ALLOCED || | |
1879 | (MINOR(disk_devt(dm_disk(md))) != minor) || | |
1880 | dm_deleting_md(md) || | |
1881 | test_bit(DMF_FREEING, &md->flags))) { | |
1882 | md = NULL; | |
1883 | goto out; | |
1884 | } | |
1885 | dm_get(md); | |
fba9f90e | 1886 | } |
1da177e4 | 1887 | |
fba9f90e | 1888 | out: |
f32c10b0 | 1889 | spin_unlock(&_minor_lock); |
1da177e4 | 1890 | |
637842cf DT |
1891 | return md; |
1892 | } | |
3cf2e4ba | 1893 | EXPORT_SYMBOL_GPL(dm_get_md); |
d229a958 | 1894 | |
9ade92a9 | 1895 | void *dm_get_mdptr(struct mapped_device *md) |
637842cf | 1896 | { |
9ade92a9 | 1897 | return md->interface_ptr; |
1da177e4 LT |
1898 | } |
1899 | ||
1900 | void dm_set_mdptr(struct mapped_device *md, void *ptr) | |
1901 | { | |
1902 | md->interface_ptr = ptr; | |
1903 | } | |
1904 | ||
1905 | void dm_get(struct mapped_device *md) | |
1906 | { | |
1907 | atomic_inc(&md->holders); | |
3f77316d | 1908 | BUG_ON(test_bit(DMF_FREEING, &md->flags)); |
1da177e4 LT |
1909 | } |
1910 | ||
09ee96b2 MP |
1911 | int dm_hold(struct mapped_device *md) |
1912 | { | |
1913 | spin_lock(&_minor_lock); | |
1914 | if (test_bit(DMF_FREEING, &md->flags)) { | |
1915 | spin_unlock(&_minor_lock); | |
1916 | return -EBUSY; | |
1917 | } | |
1918 | dm_get(md); | |
1919 | spin_unlock(&_minor_lock); | |
1920 | return 0; | |
1921 | } | |
1922 | EXPORT_SYMBOL_GPL(dm_hold); | |
1923 | ||
72d94861 AK |
1924 | const char *dm_device_name(struct mapped_device *md) |
1925 | { | |
1926 | return md->name; | |
1927 | } | |
1928 | EXPORT_SYMBOL_GPL(dm_device_name); | |
1929 | ||
3f77316d | 1930 | static void __dm_destroy(struct mapped_device *md, bool wait) |
1da177e4 | 1931 | { |
3b785fbc | 1932 | struct request_queue *q = dm_get_md_queue(md); |
1134e5ae | 1933 | struct dm_table *map; |
83d5e5b0 | 1934 | int srcu_idx; |
1da177e4 | 1935 | |
3f77316d | 1936 | might_sleep(); |
fba9f90e | 1937 | |
63a4f065 | 1938 | spin_lock(&_minor_lock); |
3f77316d KU |
1939 | idr_replace(&_minor_idr, MINOR_ALLOCED, MINOR(disk_devt(dm_disk(md)))); |
1940 | set_bit(DMF_FREEING, &md->flags); | |
1941 | spin_unlock(&_minor_lock); | |
3b785fbc | 1942 | |
2e91c369 | 1943 | blk_set_queue_dying(q); |
3f77316d | 1944 | |
02233342 | 1945 | if (dm_request_based(md) && md->kworker_task) |
3989144f | 1946 | kthread_flush_worker(&md->kworker); |
2eb6e1e3 | 1947 | |
ab7c7bb6 MP |
1948 | /* |
1949 | * Take suspend_lock so that presuspend and postsuspend methods | |
1950 | * do not race with internal suspend. | |
1951 | */ | |
1952 | mutex_lock(&md->suspend_lock); | |
2a708cff | 1953 | map = dm_get_live_table(md, &srcu_idx); |
3f77316d KU |
1954 | if (!dm_suspended_md(md)) { |
1955 | dm_table_presuspend_targets(map); | |
1956 | dm_table_postsuspend_targets(map); | |
1da177e4 | 1957 | } |
83d5e5b0 MP |
1958 | /* dm_put_live_table must be before msleep, otherwise deadlock is possible */ |
1959 | dm_put_live_table(md, srcu_idx); | |
2a708cff | 1960 | mutex_unlock(&md->suspend_lock); |
83d5e5b0 | 1961 | |
3f77316d KU |
1962 | /* |
1963 | * Rare, but there may be I/O requests still going to complete, | |
1964 | * for example. Wait for all references to disappear. | |
1965 | * No one should increment the reference count of the mapped_device, | |
1966 | * after the mapped_device state becomes DMF_FREEING. | |
1967 | */ | |
1968 | if (wait) | |
1969 | while (atomic_read(&md->holders)) | |
1970 | msleep(1); | |
1971 | else if (atomic_read(&md->holders)) | |
1972 | DMWARN("%s: Forcibly removing mapped_device still in use! (%d users)", | |
1973 | dm_device_name(md), atomic_read(&md->holders)); | |
1974 | ||
1975 | dm_sysfs_exit(md); | |
3f77316d KU |
1976 | dm_table_destroy(__unbind(md)); |
1977 | free_dev(md); | |
1978 | } | |
1979 | ||
1980 | void dm_destroy(struct mapped_device *md) | |
1981 | { | |
1982 | __dm_destroy(md, true); | |
1983 | } | |
1984 | ||
1985 | void dm_destroy_immediate(struct mapped_device *md) | |
1986 | { | |
1987 | __dm_destroy(md, false); | |
1988 | } | |
1989 | ||
1990 | void dm_put(struct mapped_device *md) | |
1991 | { | |
1992 | atomic_dec(&md->holders); | |
1da177e4 | 1993 | } |
79eb885c | 1994 | EXPORT_SYMBOL_GPL(dm_put); |
1da177e4 | 1995 | |
b48633f8 | 1996 | static int dm_wait_for_completion(struct mapped_device *md, long task_state) |
46125c1c MB |
1997 | { |
1998 | int r = 0; | |
9f4c3f87 | 1999 | DEFINE_WAIT(wait); |
46125c1c MB |
2000 | |
2001 | while (1) { | |
9f4c3f87 | 2002 | prepare_to_wait(&md->wait, &wait, task_state); |
46125c1c | 2003 | |
b4324fee | 2004 | if (!md_in_flight(md)) |
46125c1c MB |
2005 | break; |
2006 | ||
e3fabdfd | 2007 | if (signal_pending_state(task_state, current)) { |
46125c1c MB |
2008 | r = -EINTR; |
2009 | break; | |
2010 | } | |
2011 | ||
2012 | io_schedule(); | |
2013 | } | |
9f4c3f87 | 2014 | finish_wait(&md->wait, &wait); |
b44ebeb0 | 2015 | |
46125c1c MB |
2016 | return r; |
2017 | } | |
2018 | ||
1da177e4 LT |
2019 | /* |
2020 | * Process the deferred bios | |
2021 | */ | |
ef208587 | 2022 | static void dm_wq_work(struct work_struct *work) |
1da177e4 | 2023 | { |
ef208587 MP |
2024 | struct mapped_device *md = container_of(work, struct mapped_device, |
2025 | work); | |
6d6f10df | 2026 | struct bio *c; |
83d5e5b0 MP |
2027 | int srcu_idx; |
2028 | struct dm_table *map; | |
1da177e4 | 2029 | |
83d5e5b0 | 2030 | map = dm_get_live_table(md, &srcu_idx); |
ef208587 | 2031 | |
3b00b203 | 2032 | while (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) { |
df12ee99 AK |
2033 | spin_lock_irq(&md->deferred_lock); |
2034 | c = bio_list_pop(&md->deferred); | |
2035 | spin_unlock_irq(&md->deferred_lock); | |
2036 | ||
6a8736d1 | 2037 | if (!c) |
df12ee99 | 2038 | break; |
022c2611 | 2039 | |
e6ee8c0b KU |
2040 | if (dm_request_based(md)) |
2041 | generic_make_request(c); | |
6a8736d1 | 2042 | else |
83d5e5b0 | 2043 | __split_and_process_bio(md, map, c); |
022c2611 | 2044 | } |
73d410c0 | 2045 | |
83d5e5b0 | 2046 | dm_put_live_table(md, srcu_idx); |
1da177e4 LT |
2047 | } |
2048 | ||
9a1fb464 | 2049 | static void dm_queue_flush(struct mapped_device *md) |
304f3f6a | 2050 | { |
3b00b203 | 2051 | clear_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
4e857c58 | 2052 | smp_mb__after_atomic(); |
53d5914f | 2053 | queue_work(md->wq, &md->work); |
304f3f6a MB |
2054 | } |
2055 | ||
1da177e4 | 2056 | /* |
042d2a9b | 2057 | * Swap in a new table, returning the old one for the caller to destroy. |
1da177e4 | 2058 | */ |
042d2a9b | 2059 | struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table) |
1da177e4 | 2060 | { |
87eb5b21 | 2061 | struct dm_table *live_map = NULL, *map = ERR_PTR(-EINVAL); |
754c5fc7 | 2062 | struct queue_limits limits; |
042d2a9b | 2063 | int r; |
1da177e4 | 2064 | |
e61290a4 | 2065 | mutex_lock(&md->suspend_lock); |
1da177e4 LT |
2066 | |
2067 | /* device must be suspended */ | |
4f186f8b | 2068 | if (!dm_suspended_md(md)) |
93c534ae | 2069 | goto out; |
1da177e4 | 2070 | |
3ae70656 MS |
2071 | /* |
2072 | * If the new table has no data devices, retain the existing limits. | |
2073 | * This helps multipath with queue_if_no_path if all paths disappear, | |
2074 | * then new I/O is queued based on these limits, and then some paths | |
2075 | * reappear. | |
2076 | */ | |
2077 | if (dm_table_has_no_data_devices(table)) { | |
83d5e5b0 | 2078 | live_map = dm_get_live_table_fast(md); |
3ae70656 MS |
2079 | if (live_map) |
2080 | limits = md->queue->limits; | |
83d5e5b0 | 2081 | dm_put_live_table_fast(md); |
3ae70656 MS |
2082 | } |
2083 | ||
87eb5b21 MC |
2084 | if (!live_map) { |
2085 | r = dm_calculate_queue_limits(table, &limits); | |
2086 | if (r) { | |
2087 | map = ERR_PTR(r); | |
2088 | goto out; | |
2089 | } | |
042d2a9b | 2090 | } |
754c5fc7 | 2091 | |
042d2a9b | 2092 | map = __bind(md, table, &limits); |
1da177e4 | 2093 | |
93c534ae | 2094 | out: |
e61290a4 | 2095 | mutex_unlock(&md->suspend_lock); |
042d2a9b | 2096 | return map; |
1da177e4 LT |
2097 | } |
2098 | ||
2099 | /* | |
2100 | * Functions to lock and unlock any filesystem running on the | |
2101 | * device. | |
2102 | */ | |
2ca3310e | 2103 | static int lock_fs(struct mapped_device *md) |
1da177e4 | 2104 | { |
e39e2e95 | 2105 | int r; |
1da177e4 LT |
2106 | |
2107 | WARN_ON(md->frozen_sb); | |
dfbe03f6 | 2108 | |
db8fef4f | 2109 | md->frozen_sb = freeze_bdev(md->bdev); |
dfbe03f6 | 2110 | if (IS_ERR(md->frozen_sb)) { |
cf222b37 | 2111 | r = PTR_ERR(md->frozen_sb); |
e39e2e95 AK |
2112 | md->frozen_sb = NULL; |
2113 | return r; | |
dfbe03f6 AK |
2114 | } |
2115 | ||
aa8d7c2f AK |
2116 | set_bit(DMF_FROZEN, &md->flags); |
2117 | ||
1da177e4 LT |
2118 | return 0; |
2119 | } | |
2120 | ||
2ca3310e | 2121 | static void unlock_fs(struct mapped_device *md) |
1da177e4 | 2122 | { |
aa8d7c2f AK |
2123 | if (!test_bit(DMF_FROZEN, &md->flags)) |
2124 | return; | |
2125 | ||
db8fef4f | 2126 | thaw_bdev(md->bdev, md->frozen_sb); |
1da177e4 | 2127 | md->frozen_sb = NULL; |
aa8d7c2f | 2128 | clear_bit(DMF_FROZEN, &md->flags); |
1da177e4 LT |
2129 | } |
2130 | ||
2131 | /* | |
b48633f8 BVA |
2132 | * @suspend_flags: DM_SUSPEND_LOCKFS_FLAG and/or DM_SUSPEND_NOFLUSH_FLAG |
2133 | * @task_state: e.g. TASK_INTERRUPTIBLE or TASK_UNINTERRUPTIBLE | |
2134 | * @dmf_suspended_flag: DMF_SUSPENDED or DMF_SUSPENDED_INTERNALLY | |
2135 | * | |
ffcc3936 MS |
2136 | * If __dm_suspend returns 0, the device is completely quiescent |
2137 | * now. There is no request-processing activity. All new requests | |
2138 | * are being added to md->deferred list. | |
cec47e3d | 2139 | * |
ffcc3936 | 2140 | * Caller must hold md->suspend_lock |
cec47e3d | 2141 | */ |
ffcc3936 | 2142 | static int __dm_suspend(struct mapped_device *md, struct dm_table *map, |
b48633f8 | 2143 | unsigned suspend_flags, long task_state, |
eaf9a736 | 2144 | int dmf_suspended_flag) |
1da177e4 | 2145 | { |
ffcc3936 MS |
2146 | bool do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG; |
2147 | bool noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG; | |
2148 | int r; | |
1da177e4 | 2149 | |
5a8f1f80 BVA |
2150 | lockdep_assert_held(&md->suspend_lock); |
2151 | ||
2e93ccc1 KU |
2152 | /* |
2153 | * DMF_NOFLUSH_SUSPENDING must be set before presuspend. | |
2154 | * This flag is cleared before dm_suspend returns. | |
2155 | */ | |
2156 | if (noflush) | |
2157 | set_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); | |
2158 | ||
d67ee213 MS |
2159 | /* |
2160 | * This gets reverted if there's an error later and the targets | |
2161 | * provide the .presuspend_undo hook. | |
2162 | */ | |
cf222b37 AK |
2163 | dm_table_presuspend_targets(map); |
2164 | ||
32a926da | 2165 | /* |
9f518b27 KU |
2166 | * Flush I/O to the device. |
2167 | * Any I/O submitted after lock_fs() may not be flushed. | |
2168 | * noflush takes precedence over do_lockfs. | |
2169 | * (lock_fs() flushes I/Os and waits for them to complete.) | |
32a926da MP |
2170 | */ |
2171 | if (!noflush && do_lockfs) { | |
2172 | r = lock_fs(md); | |
d67ee213 MS |
2173 | if (r) { |
2174 | dm_table_presuspend_undo_targets(map); | |
ffcc3936 | 2175 | return r; |
d67ee213 | 2176 | } |
aa8d7c2f | 2177 | } |
1da177e4 LT |
2178 | |
2179 | /* | |
3b00b203 MP |
2180 | * Here we must make sure that no processes are submitting requests |
2181 | * to target drivers i.e. no one may be executing | |
2182 | * __split_and_process_bio. This is called from dm_request and | |
2183 | * dm_wq_work. | |
2184 | * | |
2185 | * To get all processes out of __split_and_process_bio in dm_request, | |
2186 | * we take the write lock. To prevent any process from reentering | |
6a8736d1 TH |
2187 | * __split_and_process_bio from dm_request and quiesce the thread |
2188 | * (dm_wq_work), we set BMF_BLOCK_IO_FOR_SUSPEND and call | |
2189 | * flush_workqueue(md->wq). | |
1da177e4 | 2190 | */ |
1eb787ec | 2191 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
41abc4e1 HR |
2192 | if (map) |
2193 | synchronize_srcu(&md->io_barrier); | |
1da177e4 | 2194 | |
d0bcb878 | 2195 | /* |
29e4013d TH |
2196 | * Stop md->queue before flushing md->wq in case request-based |
2197 | * dm defers requests to md->wq from md->queue. | |
d0bcb878 | 2198 | */ |
2eb6e1e3 | 2199 | if (dm_request_based(md)) { |
eca7ee6d | 2200 | dm_stop_queue(md->queue); |
02233342 | 2201 | if (md->kworker_task) |
3989144f | 2202 | kthread_flush_worker(&md->kworker); |
2eb6e1e3 | 2203 | } |
cec47e3d | 2204 | |
d0bcb878 KU |
2205 | flush_workqueue(md->wq); |
2206 | ||
1da177e4 | 2207 | /* |
3b00b203 MP |
2208 | * At this point no more requests are entering target request routines. |
2209 | * We call dm_wait_for_completion to wait for all existing requests | |
2210 | * to finish. | |
1da177e4 | 2211 | */ |
b48633f8 | 2212 | r = dm_wait_for_completion(md, task_state); |
eaf9a736 MS |
2213 | if (!r) |
2214 | set_bit(dmf_suspended_flag, &md->flags); | |
1da177e4 | 2215 | |
6d6f10df | 2216 | if (noflush) |
022c2611 | 2217 | clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); |
41abc4e1 HR |
2218 | if (map) |
2219 | synchronize_srcu(&md->io_barrier); | |
2e93ccc1 | 2220 | |
1da177e4 | 2221 | /* were we interrupted ? */ |
46125c1c | 2222 | if (r < 0) { |
9a1fb464 | 2223 | dm_queue_flush(md); |
73d410c0 | 2224 | |
cec47e3d | 2225 | if (dm_request_based(md)) |
eca7ee6d | 2226 | dm_start_queue(md->queue); |
cec47e3d | 2227 | |
2ca3310e | 2228 | unlock_fs(md); |
d67ee213 | 2229 | dm_table_presuspend_undo_targets(map); |
ffcc3936 | 2230 | /* pushback list is already flushed, so skip flush */ |
2ca3310e | 2231 | } |
1da177e4 | 2232 | |
ffcc3936 MS |
2233 | return r; |
2234 | } | |
2235 | ||
2236 | /* | |
2237 | * We need to be able to change a mapping table under a mounted | |
2238 | * filesystem. For example we might want to move some data in | |
2239 | * the background. Before the table can be swapped with | |
2240 | * dm_bind_table, dm_suspend must be called to flush any in | |
2241 | * flight bios and ensure that any further io gets deferred. | |
2242 | */ | |
2243 | /* | |
2244 | * Suspend mechanism in request-based dm. | |
2245 | * | |
2246 | * 1. Flush all I/Os by lock_fs() if needed. | |
2247 | * 2. Stop dispatching any I/O by stopping the request_queue. | |
2248 | * 3. Wait for all in-flight I/Os to be completed or requeued. | |
2249 | * | |
2250 | * To abort suspend, start the request_queue. | |
2251 | */ | |
2252 | int dm_suspend(struct mapped_device *md, unsigned suspend_flags) | |
2253 | { | |
2254 | struct dm_table *map = NULL; | |
2255 | int r = 0; | |
2256 | ||
2257 | retry: | |
2258 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); | |
2259 | ||
2260 | if (dm_suspended_md(md)) { | |
2261 | r = -EINVAL; | |
2262 | goto out_unlock; | |
2263 | } | |
2264 | ||
2265 | if (dm_suspended_internally_md(md)) { | |
2266 | /* already internally suspended, wait for internal resume */ | |
2267 | mutex_unlock(&md->suspend_lock); | |
2268 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); | |
2269 | if (r) | |
2270 | return r; | |
2271 | goto retry; | |
2272 | } | |
2273 | ||
a12f5d48 | 2274 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
ffcc3936 | 2275 | |
eaf9a736 | 2276 | r = __dm_suspend(md, map, suspend_flags, TASK_INTERRUPTIBLE, DMF_SUSPENDED); |
ffcc3936 MS |
2277 | if (r) |
2278 | goto out_unlock; | |
3b00b203 | 2279 | |
4d4471cb KU |
2280 | dm_table_postsuspend_targets(map); |
2281 | ||
d287483d | 2282 | out_unlock: |
e61290a4 | 2283 | mutex_unlock(&md->suspend_lock); |
cf222b37 | 2284 | return r; |
1da177e4 LT |
2285 | } |
2286 | ||
ffcc3936 MS |
2287 | static int __dm_resume(struct mapped_device *md, struct dm_table *map) |
2288 | { | |
2289 | if (map) { | |
2290 | int r = dm_table_resume_targets(map); | |
2291 | if (r) | |
2292 | return r; | |
2293 | } | |
2294 | ||
2295 | dm_queue_flush(md); | |
2296 | ||
2297 | /* | |
2298 | * Flushing deferred I/Os must be done after targets are resumed | |
2299 | * so that mapping of targets can work correctly. | |
2300 | * Request-based dm is queueing the deferred I/Os in its request_queue. | |
2301 | */ | |
2302 | if (dm_request_based(md)) | |
eca7ee6d | 2303 | dm_start_queue(md->queue); |
ffcc3936 MS |
2304 | |
2305 | unlock_fs(md); | |
2306 | ||
2307 | return 0; | |
2308 | } | |
2309 | ||
1da177e4 LT |
2310 | int dm_resume(struct mapped_device *md) |
2311 | { | |
8dc23658 | 2312 | int r; |
cf222b37 | 2313 | struct dm_table *map = NULL; |
1da177e4 | 2314 | |
ffcc3936 | 2315 | retry: |
8dc23658 | 2316 | r = -EINVAL; |
ffcc3936 MS |
2317 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); |
2318 | ||
4f186f8b | 2319 | if (!dm_suspended_md(md)) |
cf222b37 | 2320 | goto out; |
cf222b37 | 2321 | |
ffcc3936 MS |
2322 | if (dm_suspended_internally_md(md)) { |
2323 | /* already internally suspended, wait for internal resume */ | |
2324 | mutex_unlock(&md->suspend_lock); | |
2325 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); | |
2326 | if (r) | |
2327 | return r; | |
2328 | goto retry; | |
2329 | } | |
2330 | ||
a12f5d48 | 2331 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
2ca3310e | 2332 | if (!map || !dm_table_get_size(map)) |
cf222b37 | 2333 | goto out; |
1da177e4 | 2334 | |
ffcc3936 | 2335 | r = __dm_resume(md, map); |
8757b776 MB |
2336 | if (r) |
2337 | goto out; | |
2ca3310e | 2338 | |
2ca3310e | 2339 | clear_bit(DMF_SUSPENDED, &md->flags); |
cf222b37 | 2340 | out: |
e61290a4 | 2341 | mutex_unlock(&md->suspend_lock); |
2ca3310e | 2342 | |
cf222b37 | 2343 | return r; |
1da177e4 LT |
2344 | } |
2345 | ||
fd2ed4d2 MP |
2346 | /* |
2347 | * Internal suspend/resume works like userspace-driven suspend. It waits | |
2348 | * until all bios finish and prevents issuing new bios to the target drivers. | |
2349 | * It may be used only from the kernel. | |
fd2ed4d2 MP |
2350 | */ |
2351 | ||
ffcc3936 | 2352 | static void __dm_internal_suspend(struct mapped_device *md, unsigned suspend_flags) |
fd2ed4d2 | 2353 | { |
ffcc3936 MS |
2354 | struct dm_table *map = NULL; |
2355 | ||
96b26c8c | 2356 | if (md->internal_suspend_count++) |
ffcc3936 MS |
2357 | return; /* nested internal suspend */ |
2358 | ||
2359 | if (dm_suspended_md(md)) { | |
2360 | set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2361 | return; /* nest suspend */ | |
2362 | } | |
2363 | ||
a12f5d48 | 2364 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
ffcc3936 MS |
2365 | |
2366 | /* | |
2367 | * Using TASK_UNINTERRUPTIBLE because only NOFLUSH internal suspend is | |
2368 | * supported. Properly supporting a TASK_INTERRUPTIBLE internal suspend | |
2369 | * would require changing .presuspend to return an error -- avoid this | |
2370 | * until there is a need for more elaborate variants of internal suspend. | |
2371 | */ | |
eaf9a736 MS |
2372 | (void) __dm_suspend(md, map, suspend_flags, TASK_UNINTERRUPTIBLE, |
2373 | DMF_SUSPENDED_INTERNALLY); | |
ffcc3936 MS |
2374 | |
2375 | dm_table_postsuspend_targets(map); | |
2376 | } | |
2377 | ||
2378 | static void __dm_internal_resume(struct mapped_device *md) | |
2379 | { | |
96b26c8c MP |
2380 | BUG_ON(!md->internal_suspend_count); |
2381 | ||
2382 | if (--md->internal_suspend_count) | |
ffcc3936 MS |
2383 | return; /* resume from nested internal suspend */ |
2384 | ||
fd2ed4d2 | 2385 | if (dm_suspended_md(md)) |
ffcc3936 MS |
2386 | goto done; /* resume from nested suspend */ |
2387 | ||
2388 | /* | |
2389 | * NOTE: existing callers don't need to call dm_table_resume_targets | |
2390 | * (which may fail -- so best to avoid it for now by passing NULL map) | |
2391 | */ | |
2392 | (void) __dm_resume(md, NULL); | |
2393 | ||
2394 | done: | |
2395 | clear_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2396 | smp_mb__after_atomic(); | |
2397 | wake_up_bit(&md->flags, DMF_SUSPENDED_INTERNALLY); | |
2398 | } | |
2399 | ||
2400 | void dm_internal_suspend_noflush(struct mapped_device *md) | |
2401 | { | |
2402 | mutex_lock(&md->suspend_lock); | |
2403 | __dm_internal_suspend(md, DM_SUSPEND_NOFLUSH_FLAG); | |
2404 | mutex_unlock(&md->suspend_lock); | |
2405 | } | |
2406 | EXPORT_SYMBOL_GPL(dm_internal_suspend_noflush); | |
2407 | ||
2408 | void dm_internal_resume(struct mapped_device *md) | |
2409 | { | |
2410 | mutex_lock(&md->suspend_lock); | |
2411 | __dm_internal_resume(md); | |
2412 | mutex_unlock(&md->suspend_lock); | |
2413 | } | |
2414 | EXPORT_SYMBOL_GPL(dm_internal_resume); | |
2415 | ||
2416 | /* | |
2417 | * Fast variants of internal suspend/resume hold md->suspend_lock, | |
2418 | * which prevents interaction with userspace-driven suspend. | |
2419 | */ | |
2420 | ||
2421 | void dm_internal_suspend_fast(struct mapped_device *md) | |
2422 | { | |
2423 | mutex_lock(&md->suspend_lock); | |
2424 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) | |
fd2ed4d2 MP |
2425 | return; |
2426 | ||
2427 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); | |
2428 | synchronize_srcu(&md->io_barrier); | |
2429 | flush_workqueue(md->wq); | |
2430 | dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE); | |
2431 | } | |
b735fede | 2432 | EXPORT_SYMBOL_GPL(dm_internal_suspend_fast); |
fd2ed4d2 | 2433 | |
ffcc3936 | 2434 | void dm_internal_resume_fast(struct mapped_device *md) |
fd2ed4d2 | 2435 | { |
ffcc3936 | 2436 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) |
fd2ed4d2 MP |
2437 | goto done; |
2438 | ||
2439 | dm_queue_flush(md); | |
2440 | ||
2441 | done: | |
2442 | mutex_unlock(&md->suspend_lock); | |
2443 | } | |
b735fede | 2444 | EXPORT_SYMBOL_GPL(dm_internal_resume_fast); |
fd2ed4d2 | 2445 | |
1da177e4 LT |
2446 | /*----------------------------------------------------------------- |
2447 | * Event notification. | |
2448 | *---------------------------------------------------------------*/ | |
3abf85b5 | 2449 | int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, |
60935eb2 | 2450 | unsigned cookie) |
69267a30 | 2451 | { |
60935eb2 MB |
2452 | char udev_cookie[DM_COOKIE_LENGTH]; |
2453 | char *envp[] = { udev_cookie, NULL }; | |
2454 | ||
2455 | if (!cookie) | |
3abf85b5 | 2456 | return kobject_uevent(&disk_to_dev(md->disk)->kobj, action); |
60935eb2 MB |
2457 | else { |
2458 | snprintf(udev_cookie, DM_COOKIE_LENGTH, "%s=%u", | |
2459 | DM_COOKIE_ENV_VAR_NAME, cookie); | |
3abf85b5 PR |
2460 | return kobject_uevent_env(&disk_to_dev(md->disk)->kobj, |
2461 | action, envp); | |
60935eb2 | 2462 | } |
69267a30 AK |
2463 | } |
2464 | ||
7a8c3d3b MA |
2465 | uint32_t dm_next_uevent_seq(struct mapped_device *md) |
2466 | { | |
2467 | return atomic_add_return(1, &md->uevent_seq); | |
2468 | } | |
2469 | ||
1da177e4 LT |
2470 | uint32_t dm_get_event_nr(struct mapped_device *md) |
2471 | { | |
2472 | return atomic_read(&md->event_nr); | |
2473 | } | |
2474 | ||
2475 | int dm_wait_event(struct mapped_device *md, int event_nr) | |
2476 | { | |
2477 | return wait_event_interruptible(md->eventq, | |
2478 | (event_nr != atomic_read(&md->event_nr))); | |
2479 | } | |
2480 | ||
7a8c3d3b MA |
2481 | void dm_uevent_add(struct mapped_device *md, struct list_head *elist) |
2482 | { | |
2483 | unsigned long flags; | |
2484 | ||
2485 | spin_lock_irqsave(&md->uevent_lock, flags); | |
2486 | list_add(elist, &md->uevent_list); | |
2487 | spin_unlock_irqrestore(&md->uevent_lock, flags); | |
2488 | } | |
2489 | ||
1da177e4 LT |
2490 | /* |
2491 | * The gendisk is only valid as long as you have a reference | |
2492 | * count on 'md'. | |
2493 | */ | |
2494 | struct gendisk *dm_disk(struct mapped_device *md) | |
2495 | { | |
2496 | return md->disk; | |
2497 | } | |
65ff5b7d | 2498 | EXPORT_SYMBOL_GPL(dm_disk); |
1da177e4 | 2499 | |
784aae73 MB |
2500 | struct kobject *dm_kobject(struct mapped_device *md) |
2501 | { | |
2995fa78 | 2502 | return &md->kobj_holder.kobj; |
784aae73 MB |
2503 | } |
2504 | ||
784aae73 MB |
2505 | struct mapped_device *dm_get_from_kobject(struct kobject *kobj) |
2506 | { | |
2507 | struct mapped_device *md; | |
2508 | ||
2995fa78 | 2509 | md = container_of(kobj, struct mapped_device, kobj_holder.kobj); |
784aae73 | 2510 | |
4d89b7b4 | 2511 | if (test_bit(DMF_FREEING, &md->flags) || |
432a212c | 2512 | dm_deleting_md(md)) |
4d89b7b4 MB |
2513 | return NULL; |
2514 | ||
784aae73 MB |
2515 | dm_get(md); |
2516 | return md; | |
2517 | } | |
2518 | ||
4f186f8b | 2519 | int dm_suspended_md(struct mapped_device *md) |
1da177e4 LT |
2520 | { |
2521 | return test_bit(DMF_SUSPENDED, &md->flags); | |
2522 | } | |
2523 | ||
ffcc3936 MS |
2524 | int dm_suspended_internally_md(struct mapped_device *md) |
2525 | { | |
2526 | return test_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2527 | } | |
2528 | ||
2c140a24 MP |
2529 | int dm_test_deferred_remove_flag(struct mapped_device *md) |
2530 | { | |
2531 | return test_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
2532 | } | |
2533 | ||
64dbce58 KU |
2534 | int dm_suspended(struct dm_target *ti) |
2535 | { | |
ecdb2e25 | 2536 | return dm_suspended_md(dm_table_get_md(ti->table)); |
64dbce58 KU |
2537 | } |
2538 | EXPORT_SYMBOL_GPL(dm_suspended); | |
2539 | ||
2e93ccc1 KU |
2540 | int dm_noflush_suspending(struct dm_target *ti) |
2541 | { | |
ecdb2e25 | 2542 | return __noflush_suspending(dm_table_get_md(ti->table)); |
2e93ccc1 KU |
2543 | } |
2544 | EXPORT_SYMBOL_GPL(dm_noflush_suspending); | |
2545 | ||
78d8e58a | 2546 | struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, unsigned type, |
30187e1d | 2547 | unsigned integrity, unsigned per_io_data_size) |
e6ee8c0b | 2548 | { |
115485e8 | 2549 | struct dm_md_mempools *pools = kzalloc_node(sizeof(*pools), GFP_KERNEL, md->numa_node_id); |
78d8e58a | 2550 | unsigned int pool_size = 0; |
5f015204 | 2551 | unsigned int front_pad; |
e6ee8c0b KU |
2552 | |
2553 | if (!pools) | |
4e6e36c3 | 2554 | return NULL; |
e6ee8c0b | 2555 | |
78d8e58a MS |
2556 | switch (type) { |
2557 | case DM_TYPE_BIO_BASED: | |
545ed20e | 2558 | case DM_TYPE_DAX_BIO_BASED: |
78d8e58a | 2559 | pool_size = dm_get_reserved_bio_based_ios(); |
30187e1d | 2560 | front_pad = roundup(per_io_data_size, __alignof__(struct dm_target_io)) + offsetof(struct dm_target_io, clone); |
eb8db831 CH |
2561 | |
2562 | pools->io_pool = mempool_create_slab_pool(pool_size, _io_cache); | |
2563 | if (!pools->io_pool) | |
2564 | goto out; | |
78d8e58a MS |
2565 | break; |
2566 | case DM_TYPE_REQUEST_BASED: | |
78d8e58a | 2567 | case DM_TYPE_MQ_REQUEST_BASED: |
eb8db831 | 2568 | pool_size = dm_get_reserved_rq_based_ios(); |
78d8e58a | 2569 | front_pad = offsetof(struct dm_rq_clone_bio_info, clone); |
591ddcfc | 2570 | /* per_io_data_size is used for blk-mq pdu at queue allocation */ |
78d8e58a MS |
2571 | break; |
2572 | default: | |
2573 | BUG(); | |
2574 | } | |
2575 | ||
3d8aab2d | 2576 | pools->bs = bioset_create_nobvec(pool_size, front_pad); |
e6ee8c0b | 2577 | if (!pools->bs) |
5f015204 | 2578 | goto out; |
e6ee8c0b | 2579 | |
a91a2785 | 2580 | if (integrity && bioset_integrity_create(pools->bs, pool_size)) |
5f015204 | 2581 | goto out; |
a91a2785 | 2582 | |
e6ee8c0b | 2583 | return pools; |
5f1b670d | 2584 | |
5f1b670d CH |
2585 | out: |
2586 | dm_free_md_mempools(pools); | |
78d8e58a | 2587 | |
4e6e36c3 | 2588 | return NULL; |
e6ee8c0b KU |
2589 | } |
2590 | ||
2591 | void dm_free_md_mempools(struct dm_md_mempools *pools) | |
2592 | { | |
2593 | if (!pools) | |
2594 | return; | |
2595 | ||
6f65985e | 2596 | mempool_destroy(pools->io_pool); |
1ae49ea2 | 2597 | |
e6ee8c0b KU |
2598 | if (pools->bs) |
2599 | bioset_free(pools->bs); | |
2600 | ||
2601 | kfree(pools); | |
2602 | } | |
2603 | ||
9c72bad1 CH |
2604 | struct dm_pr { |
2605 | u64 old_key; | |
2606 | u64 new_key; | |
2607 | u32 flags; | |
2608 | bool fail_early; | |
2609 | }; | |
2610 | ||
2611 | static int dm_call_pr(struct block_device *bdev, iterate_devices_callout_fn fn, | |
2612 | void *data) | |
71cdb697 CH |
2613 | { |
2614 | struct mapped_device *md = bdev->bd_disk->private_data; | |
9c72bad1 CH |
2615 | struct dm_table *table; |
2616 | struct dm_target *ti; | |
2617 | int ret = -ENOTTY, srcu_idx; | |
71cdb697 | 2618 | |
9c72bad1 CH |
2619 | table = dm_get_live_table(md, &srcu_idx); |
2620 | if (!table || !dm_table_get_size(table)) | |
2621 | goto out; | |
71cdb697 | 2622 | |
9c72bad1 CH |
2623 | /* We only support devices that have a single target */ |
2624 | if (dm_table_get_num_targets(table) != 1) | |
2625 | goto out; | |
2626 | ti = dm_table_get_target(table, 0); | |
71cdb697 | 2627 | |
9c72bad1 CH |
2628 | ret = -EINVAL; |
2629 | if (!ti->type->iterate_devices) | |
2630 | goto out; | |
2631 | ||
2632 | ret = ti->type->iterate_devices(ti, fn, data); | |
2633 | out: | |
2634 | dm_put_live_table(md, srcu_idx); | |
2635 | return ret; | |
2636 | } | |
2637 | ||
2638 | /* | |
2639 | * For register / unregister we need to manually call out to every path. | |
2640 | */ | |
2641 | static int __dm_pr_register(struct dm_target *ti, struct dm_dev *dev, | |
2642 | sector_t start, sector_t len, void *data) | |
2643 | { | |
2644 | struct dm_pr *pr = data; | |
2645 | const struct pr_ops *ops = dev->bdev->bd_disk->fops->pr_ops; | |
2646 | ||
2647 | if (!ops || !ops->pr_register) | |
2648 | return -EOPNOTSUPP; | |
2649 | return ops->pr_register(dev->bdev, pr->old_key, pr->new_key, pr->flags); | |
2650 | } | |
2651 | ||
2652 | static int dm_pr_register(struct block_device *bdev, u64 old_key, u64 new_key, | |
2653 | u32 flags) | |
2654 | { | |
2655 | struct dm_pr pr = { | |
2656 | .old_key = old_key, | |
2657 | .new_key = new_key, | |
2658 | .flags = flags, | |
2659 | .fail_early = true, | |
2660 | }; | |
2661 | int ret; | |
2662 | ||
2663 | ret = dm_call_pr(bdev, __dm_pr_register, &pr); | |
2664 | if (ret && new_key) { | |
2665 | /* unregister all paths if we failed to register any path */ | |
2666 | pr.old_key = new_key; | |
2667 | pr.new_key = 0; | |
2668 | pr.flags = 0; | |
2669 | pr.fail_early = false; | |
2670 | dm_call_pr(bdev, __dm_pr_register, &pr); | |
2671 | } | |
2672 | ||
2673 | return ret; | |
71cdb697 CH |
2674 | } |
2675 | ||
2676 | static int dm_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type, | |
956a4025 | 2677 | u32 flags) |
71cdb697 CH |
2678 | { |
2679 | struct mapped_device *md = bdev->bd_disk->private_data; | |
2680 | const struct pr_ops *ops; | |
71cdb697 | 2681 | fmode_t mode; |
956a4025 | 2682 | int r; |
71cdb697 | 2683 | |
956a4025 | 2684 | r = dm_grab_bdev_for_ioctl(md, &bdev, &mode); |
71cdb697 CH |
2685 | if (r < 0) |
2686 | return r; | |
2687 | ||
2688 | ops = bdev->bd_disk->fops->pr_ops; | |
2689 | if (ops && ops->pr_reserve) | |
2690 | r = ops->pr_reserve(bdev, key, type, flags); | |
2691 | else | |
2692 | r = -EOPNOTSUPP; | |
2693 | ||
956a4025 | 2694 | bdput(bdev); |
71cdb697 CH |
2695 | return r; |
2696 | } | |
2697 | ||
2698 | static int dm_pr_release(struct block_device *bdev, u64 key, enum pr_type type) | |
2699 | { | |
2700 | struct mapped_device *md = bdev->bd_disk->private_data; | |
2701 | const struct pr_ops *ops; | |
71cdb697 | 2702 | fmode_t mode; |
956a4025 | 2703 | int r; |
71cdb697 | 2704 | |
956a4025 | 2705 | r = dm_grab_bdev_for_ioctl(md, &bdev, &mode); |
71cdb697 CH |
2706 | if (r < 0) |
2707 | return r; | |
2708 | ||
2709 | ops = bdev->bd_disk->fops->pr_ops; | |
2710 | if (ops && ops->pr_release) | |
2711 | r = ops->pr_release(bdev, key, type); | |
2712 | else | |
2713 | r = -EOPNOTSUPP; | |
2714 | ||
956a4025 | 2715 | bdput(bdev); |
71cdb697 CH |
2716 | return r; |
2717 | } | |
2718 | ||
2719 | static int dm_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key, | |
956a4025 | 2720 | enum pr_type type, bool abort) |
71cdb697 CH |
2721 | { |
2722 | struct mapped_device *md = bdev->bd_disk->private_data; | |
2723 | const struct pr_ops *ops; | |
71cdb697 | 2724 | fmode_t mode; |
956a4025 | 2725 | int r; |
71cdb697 | 2726 | |
956a4025 | 2727 | r = dm_grab_bdev_for_ioctl(md, &bdev, &mode); |
71cdb697 CH |
2728 | if (r < 0) |
2729 | return r; | |
2730 | ||
2731 | ops = bdev->bd_disk->fops->pr_ops; | |
2732 | if (ops && ops->pr_preempt) | |
2733 | r = ops->pr_preempt(bdev, old_key, new_key, type, abort); | |
2734 | else | |
2735 | r = -EOPNOTSUPP; | |
2736 | ||
956a4025 | 2737 | bdput(bdev); |
71cdb697 CH |
2738 | return r; |
2739 | } | |
2740 | ||
2741 | static int dm_pr_clear(struct block_device *bdev, u64 key) | |
2742 | { | |
2743 | struct mapped_device *md = bdev->bd_disk->private_data; | |
2744 | const struct pr_ops *ops; | |
71cdb697 | 2745 | fmode_t mode; |
956a4025 | 2746 | int r; |
71cdb697 | 2747 | |
956a4025 | 2748 | r = dm_grab_bdev_for_ioctl(md, &bdev, &mode); |
71cdb697 CH |
2749 | if (r < 0) |
2750 | return r; | |
2751 | ||
2752 | ops = bdev->bd_disk->fops->pr_ops; | |
2753 | if (ops && ops->pr_clear) | |
2754 | r = ops->pr_clear(bdev, key); | |
2755 | else | |
2756 | r = -EOPNOTSUPP; | |
2757 | ||
956a4025 | 2758 | bdput(bdev); |
71cdb697 CH |
2759 | return r; |
2760 | } | |
2761 | ||
2762 | static const struct pr_ops dm_pr_ops = { | |
2763 | .pr_register = dm_pr_register, | |
2764 | .pr_reserve = dm_pr_reserve, | |
2765 | .pr_release = dm_pr_release, | |
2766 | .pr_preempt = dm_pr_preempt, | |
2767 | .pr_clear = dm_pr_clear, | |
2768 | }; | |
2769 | ||
83d5cde4 | 2770 | static const struct block_device_operations dm_blk_dops = { |
1da177e4 LT |
2771 | .open = dm_blk_open, |
2772 | .release = dm_blk_close, | |
aa129a22 | 2773 | .ioctl = dm_blk_ioctl, |
545ed20e | 2774 | .direct_access = dm_blk_direct_access, |
3ac51e74 | 2775 | .getgeo = dm_blk_getgeo, |
71cdb697 | 2776 | .pr_ops = &dm_pr_ops, |
1da177e4 LT |
2777 | .owner = THIS_MODULE |
2778 | }; | |
2779 | ||
1da177e4 LT |
2780 | /* |
2781 | * module hooks | |
2782 | */ | |
2783 | module_init(dm_init); | |
2784 | module_exit(dm_exit); | |
2785 | ||
2786 | module_param(major, uint, 0); | |
2787 | MODULE_PARM_DESC(major, "The major number of the device mapper"); | |
f4790826 | 2788 | |
e8603136 MS |
2789 | module_param(reserved_bio_based_ios, uint, S_IRUGO | S_IWUSR); |
2790 | MODULE_PARM_DESC(reserved_bio_based_ios, "Reserved IOs in bio-based mempools"); | |
2791 | ||
115485e8 MS |
2792 | module_param(dm_numa_node, int, S_IRUGO | S_IWUSR); |
2793 | MODULE_PARM_DESC(dm_numa_node, "NUMA node for DM device memory allocations"); | |
2794 | ||
1da177e4 LT |
2795 | MODULE_DESCRIPTION(DM_NAME " driver"); |
2796 | MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>"); | |
2797 | MODULE_LICENSE("GPL"); |