Commit | Line | Data |
---|---|---|
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" |
91ccbbac | 11 | #include "dm-ima.h" |
1da177e4 LT |
12 | |
13 | #include <linux/init.h> | |
14 | #include <linux/module.h> | |
48c9c27b | 15 | #include <linux/mutex.h> |
6958c1c6 | 16 | #include <linux/sched/mm.h> |
174cd4b1 | 17 | #include <linux/sched/signal.h> |
1da177e4 LT |
18 | #include <linux/blkpg.h> |
19 | #include <linux/bio.h> | |
1da177e4 | 20 | #include <linux/mempool.h> |
f26c5719 | 21 | #include <linux/dax.h> |
1da177e4 LT |
22 | #include <linux/slab.h> |
23 | #include <linux/idr.h> | |
7e026c8c | 24 | #include <linux/uio.h> |
3ac51e74 | 25 | #include <linux/hdreg.h> |
3f77316d | 26 | #include <linux/delay.h> |
ffcc3936 | 27 | #include <linux/wait.h> |
71cdb697 | 28 | #include <linux/pr.h> |
b0b4d7c6 | 29 | #include <linux/refcount.h> |
c6a564ff | 30 | #include <linux/part_stat.h> |
a892c8d5 | 31 | #include <linux/blk-crypto.h> |
1e8d44bd | 32 | #include <linux/blk-crypto-profile.h> |
55782138 | 33 | |
72d94861 AK |
34 | #define DM_MSG_PREFIX "core" |
35 | ||
60935eb2 MB |
36 | /* |
37 | * Cookies are numeric values sent with CHANGE and REMOVE | |
38 | * uevents while resuming, removing or renaming the device. | |
39 | */ | |
40 | #define DM_COOKIE_ENV_VAR_NAME "DM_COOKIE" | |
41 | #define DM_COOKIE_LENGTH 24 | |
42 | ||
1da177e4 LT |
43 | static const char *_name = DM_NAME; |
44 | ||
45 | static unsigned int major = 0; | |
46 | static unsigned int _major = 0; | |
47 | ||
d15b774c AK |
48 | static DEFINE_IDR(_minor_idr); |
49 | ||
f32c10b0 | 50 | static DEFINE_SPINLOCK(_minor_lock); |
2c140a24 MP |
51 | |
52 | static void do_deferred_remove(struct work_struct *w); | |
53 | ||
54 | static DECLARE_WORK(deferred_remove_work, do_deferred_remove); | |
55 | ||
acfe0ad7 MP |
56 | static struct workqueue_struct *deferred_remove_workqueue; |
57 | ||
93e6442c MP |
58 | atomic_t dm_global_event_nr = ATOMIC_INIT(0); |
59 | DECLARE_WAIT_QUEUE_HEAD(dm_global_eventq); | |
60 | ||
62e08243 MP |
61 | void dm_issue_global_event(void) |
62 | { | |
63 | atomic_inc(&dm_global_event_nr); | |
64 | wake_up(&dm_global_eventq); | |
65 | } | |
66 | ||
1da177e4 | 67 | /* |
64f52b0e | 68 | * One of these is allocated (on-stack) per original bio. |
1da177e4 | 69 | */ |
64f52b0e | 70 | struct clone_info { |
64f52b0e MS |
71 | struct dm_table *map; |
72 | struct bio *bio; | |
73 | struct dm_io *io; | |
74 | sector_t sector; | |
75 | unsigned sector_count; | |
76 | }; | |
77 | ||
62f26317 JX |
78 | #define DM_TARGET_IO_BIO_OFFSET (offsetof(struct dm_target_io, clone)) |
79 | #define DM_IO_BIO_OFFSET \ | |
80 | (offsetof(struct dm_target_io, clone) + offsetof(struct dm_io, tio)) | |
81 | ||
6c23f0bd CH |
82 | static inline struct dm_target_io *clone_to_tio(struct bio *clone) |
83 | { | |
84 | return container_of(clone, struct dm_target_io, clone); | |
85 | } | |
86 | ||
64f52b0e MS |
87 | void *dm_per_bio_data(struct bio *bio, size_t data_size) |
88 | { | |
6c23f0bd | 89 | if (!clone_to_tio(bio)->inside_dm_io) |
62f26317 JX |
90 | return (char *)bio - DM_TARGET_IO_BIO_OFFSET - data_size; |
91 | return (char *)bio - DM_IO_BIO_OFFSET - data_size; | |
64f52b0e MS |
92 | } |
93 | EXPORT_SYMBOL_GPL(dm_per_bio_data); | |
94 | ||
95 | struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size) | |
96 | { | |
97 | struct dm_io *io = (struct dm_io *)((char *)data + data_size); | |
98 | if (io->magic == DM_IO_MAGIC) | |
62f26317 | 99 | return (struct bio *)((char *)io + DM_IO_BIO_OFFSET); |
64f52b0e | 100 | BUG_ON(io->magic != DM_TIO_MAGIC); |
62f26317 | 101 | return (struct bio *)((char *)io + DM_TARGET_IO_BIO_OFFSET); |
64f52b0e MS |
102 | } |
103 | EXPORT_SYMBOL_GPL(dm_bio_from_per_bio_data); | |
104 | ||
105 | unsigned dm_bio_get_target_bio_nr(const struct bio *bio) | |
106 | { | |
107 | return container_of(bio, struct dm_target_io, clone)->target_bio_nr; | |
108 | } | |
109 | EXPORT_SYMBOL_GPL(dm_bio_get_target_bio_nr); | |
110 | ||
ba61fdd1 JM |
111 | #define MINOR_ALLOCED ((void *)-1) |
112 | ||
115485e8 | 113 | #define DM_NUMA_NODE NUMA_NO_NODE |
115485e8 | 114 | static int dm_numa_node = DM_NUMA_NODE; |
faad87df | 115 | |
a666e5c0 MP |
116 | #define DEFAULT_SWAP_BIOS (8 * 1048576 / PAGE_SIZE) |
117 | static int swap_bios = DEFAULT_SWAP_BIOS; | |
118 | static int get_swap_bios(void) | |
119 | { | |
120 | int latch = READ_ONCE(swap_bios); | |
121 | if (unlikely(latch <= 0)) | |
122 | latch = DEFAULT_SWAP_BIOS; | |
123 | return latch; | |
124 | } | |
125 | ||
e6ee8c0b KU |
126 | /* |
127 | * For mempools pre-allocation at the table loading time. | |
128 | */ | |
129 | struct dm_md_mempools { | |
6f1c819c KO |
130 | struct bio_set bs; |
131 | struct bio_set io_bs; | |
e6ee8c0b KU |
132 | }; |
133 | ||
86f1152b BM |
134 | struct table_device { |
135 | struct list_head list; | |
b0b4d7c6 | 136 | refcount_t count; |
86f1152b BM |
137 | struct dm_dev dm_dev; |
138 | }; | |
139 | ||
e8603136 MS |
140 | /* |
141 | * Bio-based DM's mempools' reserved IOs set by the user. | |
142 | */ | |
4cc96131 | 143 | #define RESERVED_BIO_BASED_IOS 16 |
e8603136 MS |
144 | static unsigned reserved_bio_based_ios = RESERVED_BIO_BASED_IOS; |
145 | ||
115485e8 MS |
146 | static int __dm_get_module_param_int(int *module_param, int min, int max) |
147 | { | |
6aa7de05 | 148 | int param = READ_ONCE(*module_param); |
115485e8 MS |
149 | int modified_param = 0; |
150 | bool modified = true; | |
151 | ||
152 | if (param < min) | |
153 | modified_param = min; | |
154 | else if (param > max) | |
155 | modified_param = max; | |
156 | else | |
157 | modified = false; | |
158 | ||
159 | if (modified) { | |
160 | (void)cmpxchg(module_param, param, modified_param); | |
161 | param = modified_param; | |
162 | } | |
163 | ||
164 | return param; | |
165 | } | |
166 | ||
4cc96131 MS |
167 | unsigned __dm_get_module_param(unsigned *module_param, |
168 | unsigned def, unsigned max) | |
f4790826 | 169 | { |
6aa7de05 | 170 | unsigned param = READ_ONCE(*module_param); |
09c2d531 | 171 | unsigned modified_param = 0; |
f4790826 | 172 | |
09c2d531 MS |
173 | if (!param) |
174 | modified_param = def; | |
175 | else if (param > max) | |
176 | modified_param = max; | |
f4790826 | 177 | |
09c2d531 MS |
178 | if (modified_param) { |
179 | (void)cmpxchg(module_param, param, modified_param); | |
180 | param = modified_param; | |
f4790826 MS |
181 | } |
182 | ||
09c2d531 | 183 | return param; |
f4790826 MS |
184 | } |
185 | ||
e8603136 MS |
186 | unsigned dm_get_reserved_bio_based_ios(void) |
187 | { | |
09c2d531 | 188 | return __dm_get_module_param(&reserved_bio_based_ios, |
4cc96131 | 189 | RESERVED_BIO_BASED_IOS, DM_RESERVED_MAX_IOS); |
e8603136 MS |
190 | } |
191 | EXPORT_SYMBOL_GPL(dm_get_reserved_bio_based_ios); | |
192 | ||
115485e8 MS |
193 | static unsigned dm_get_numa_node(void) |
194 | { | |
195 | return __dm_get_module_param_int(&dm_numa_node, | |
196 | DM_NUMA_NODE, num_online_nodes() - 1); | |
197 | } | |
198 | ||
1da177e4 LT |
199 | static int __init local_init(void) |
200 | { | |
e689fbab | 201 | int r; |
1ae49ea2 | 202 | |
51e5b2bd | 203 | r = dm_uevent_init(); |
51157b4a | 204 | if (r) |
e689fbab | 205 | return r; |
51e5b2bd | 206 | |
acfe0ad7 MP |
207 | deferred_remove_workqueue = alloc_workqueue("kdmremove", WQ_UNBOUND, 1); |
208 | if (!deferred_remove_workqueue) { | |
209 | r = -ENOMEM; | |
210 | goto out_uevent_exit; | |
211 | } | |
212 | ||
1da177e4 LT |
213 | _major = major; |
214 | r = register_blkdev(_major, _name); | |
51157b4a | 215 | if (r < 0) |
acfe0ad7 | 216 | goto out_free_workqueue; |
1da177e4 LT |
217 | |
218 | if (!_major) | |
219 | _major = r; | |
220 | ||
221 | return 0; | |
51157b4a | 222 | |
acfe0ad7 MP |
223 | out_free_workqueue: |
224 | destroy_workqueue(deferred_remove_workqueue); | |
51157b4a KU |
225 | out_uevent_exit: |
226 | dm_uevent_exit(); | |
51157b4a KU |
227 | |
228 | return r; | |
1da177e4 LT |
229 | } |
230 | ||
231 | static void local_exit(void) | |
232 | { | |
2c140a24 | 233 | flush_scheduled_work(); |
acfe0ad7 | 234 | destroy_workqueue(deferred_remove_workqueue); |
2c140a24 | 235 | |
00d59405 | 236 | unregister_blkdev(_major, _name); |
51e5b2bd | 237 | dm_uevent_exit(); |
1da177e4 LT |
238 | |
239 | _major = 0; | |
240 | ||
241 | DMINFO("cleaned up"); | |
242 | } | |
243 | ||
b9249e55 | 244 | static int (*_inits[])(void) __initdata = { |
1da177e4 LT |
245 | local_init, |
246 | dm_target_init, | |
247 | dm_linear_init, | |
248 | dm_stripe_init, | |
952b3557 | 249 | dm_io_init, |
945fa4d2 | 250 | dm_kcopyd_init, |
1da177e4 | 251 | dm_interface_init, |
fd2ed4d2 | 252 | dm_statistics_init, |
1da177e4 LT |
253 | }; |
254 | ||
b9249e55 | 255 | static void (*_exits[])(void) = { |
1da177e4 LT |
256 | local_exit, |
257 | dm_target_exit, | |
258 | dm_linear_exit, | |
259 | dm_stripe_exit, | |
952b3557 | 260 | dm_io_exit, |
945fa4d2 | 261 | dm_kcopyd_exit, |
1da177e4 | 262 | dm_interface_exit, |
fd2ed4d2 | 263 | dm_statistics_exit, |
1da177e4 LT |
264 | }; |
265 | ||
266 | static int __init dm_init(void) | |
267 | { | |
268 | const int count = ARRAY_SIZE(_inits); | |
1da177e4 LT |
269 | int r, i; |
270 | ||
f1cd6cb2 TS |
271 | #if (IS_ENABLED(CONFIG_IMA) && !IS_ENABLED(CONFIG_IMA_DISABLE_HTABLE)) |
272 | DMWARN("CONFIG_IMA_DISABLE_HTABLE is disabled." | |
273 | " Duplicate IMA measurements will not be recorded in the IMA log."); | |
274 | #endif | |
275 | ||
1da177e4 LT |
276 | for (i = 0; i < count; i++) { |
277 | r = _inits[i](); | |
278 | if (r) | |
279 | goto bad; | |
280 | } | |
281 | ||
282 | return 0; | |
f1cd6cb2 | 283 | bad: |
1da177e4 LT |
284 | while (i--) |
285 | _exits[i](); | |
286 | ||
287 | return r; | |
288 | } | |
289 | ||
290 | static void __exit dm_exit(void) | |
291 | { | |
292 | int i = ARRAY_SIZE(_exits); | |
293 | ||
294 | while (i--) | |
295 | _exits[i](); | |
d15b774c AK |
296 | |
297 | /* | |
298 | * Should be empty by this point. | |
299 | */ | |
d15b774c | 300 | idr_destroy(&_minor_idr); |
1da177e4 LT |
301 | } |
302 | ||
303 | /* | |
304 | * Block device functions | |
305 | */ | |
432a212c MA |
306 | int dm_deleting_md(struct mapped_device *md) |
307 | { | |
308 | return test_bit(DMF_DELETING, &md->flags); | |
309 | } | |
310 | ||
fe5f9f2c | 311 | static int dm_blk_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
312 | { |
313 | struct mapped_device *md; | |
314 | ||
fba9f90e JM |
315 | spin_lock(&_minor_lock); |
316 | ||
fe5f9f2c | 317 | md = bdev->bd_disk->private_data; |
fba9f90e JM |
318 | if (!md) |
319 | goto out; | |
320 | ||
5c6bd75d | 321 | if (test_bit(DMF_FREEING, &md->flags) || |
432a212c | 322 | dm_deleting_md(md)) { |
fba9f90e JM |
323 | md = NULL; |
324 | goto out; | |
325 | } | |
326 | ||
1da177e4 | 327 | dm_get(md); |
5c6bd75d | 328 | atomic_inc(&md->open_count); |
fba9f90e JM |
329 | out: |
330 | spin_unlock(&_minor_lock); | |
331 | ||
332 | return md ? 0 : -ENXIO; | |
1da177e4 LT |
333 | } |
334 | ||
db2a144b | 335 | static void dm_blk_close(struct gendisk *disk, fmode_t mode) |
1da177e4 | 336 | { |
63a4f065 | 337 | struct mapped_device *md; |
6e9624b8 | 338 | |
4a1aeb98 MB |
339 | spin_lock(&_minor_lock); |
340 | ||
63a4f065 MS |
341 | md = disk->private_data; |
342 | if (WARN_ON(!md)) | |
343 | goto out; | |
344 | ||
2c140a24 MP |
345 | if (atomic_dec_and_test(&md->open_count) && |
346 | (test_bit(DMF_DEFERRED_REMOVE, &md->flags))) | |
acfe0ad7 | 347 | queue_work(deferred_remove_workqueue, &deferred_remove_work); |
2c140a24 | 348 | |
1da177e4 | 349 | dm_put(md); |
63a4f065 | 350 | out: |
4a1aeb98 | 351 | spin_unlock(&_minor_lock); |
1da177e4 LT |
352 | } |
353 | ||
5c6bd75d AK |
354 | int dm_open_count(struct mapped_device *md) |
355 | { | |
356 | return atomic_read(&md->open_count); | |
357 | } | |
358 | ||
359 | /* | |
360 | * Guarantees nothing is using the device before it's deleted. | |
361 | */ | |
2c140a24 | 362 | int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred) |
5c6bd75d AK |
363 | { |
364 | int r = 0; | |
365 | ||
366 | spin_lock(&_minor_lock); | |
367 | ||
2c140a24 | 368 | if (dm_open_count(md)) { |
5c6bd75d | 369 | r = -EBUSY; |
2c140a24 MP |
370 | if (mark_deferred) |
371 | set_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
372 | } else if (only_deferred && !test_bit(DMF_DEFERRED_REMOVE, &md->flags)) | |
373 | r = -EEXIST; | |
5c6bd75d AK |
374 | else |
375 | set_bit(DMF_DELETING, &md->flags); | |
376 | ||
377 | spin_unlock(&_minor_lock); | |
378 | ||
379 | return r; | |
380 | } | |
381 | ||
2c140a24 MP |
382 | int dm_cancel_deferred_remove(struct mapped_device *md) |
383 | { | |
384 | int r = 0; | |
385 | ||
386 | spin_lock(&_minor_lock); | |
387 | ||
388 | if (test_bit(DMF_DELETING, &md->flags)) | |
389 | r = -EBUSY; | |
390 | else | |
391 | clear_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
392 | ||
393 | spin_unlock(&_minor_lock); | |
394 | ||
395 | return r; | |
396 | } | |
397 | ||
398 | static void do_deferred_remove(struct work_struct *w) | |
399 | { | |
400 | dm_deferred_remove(); | |
401 | } | |
402 | ||
3ac51e74 DW |
403 | static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
404 | { | |
405 | struct mapped_device *md = bdev->bd_disk->private_data; | |
406 | ||
407 | return dm_get_geometry(md, geo); | |
408 | } | |
409 | ||
971888c4 | 410 | static int dm_prepare_ioctl(struct mapped_device *md, int *srcu_idx, |
5bd5e8d8 | 411 | struct block_device **bdev) |
aa129a22 | 412 | { |
66482026 | 413 | struct dm_target *tgt; |
6c182cd8 | 414 | struct dm_table *map; |
971888c4 | 415 | int r; |
aa129a22 | 416 | |
6c182cd8 | 417 | retry: |
e56f81e0 | 418 | r = -ENOTTY; |
971888c4 | 419 | map = dm_get_live_table(md, srcu_idx); |
aa129a22 | 420 | if (!map || !dm_table_get_size(map)) |
971888c4 | 421 | return r; |
aa129a22 MB |
422 | |
423 | /* We only support devices that have a single target */ | |
424 | if (dm_table_get_num_targets(map) != 1) | |
971888c4 | 425 | return r; |
aa129a22 | 426 | |
66482026 MS |
427 | tgt = dm_table_get_target(map, 0); |
428 | if (!tgt->type->prepare_ioctl) | |
971888c4 | 429 | return r; |
519049af | 430 | |
971888c4 MS |
431 | if (dm_suspended_md(md)) |
432 | return -EAGAIN; | |
aa129a22 | 433 | |
5bd5e8d8 | 434 | r = tgt->type->prepare_ioctl(tgt, bdev); |
5bbbfdf6 | 435 | if (r == -ENOTCONN && !fatal_signal_pending(current)) { |
971888c4 | 436 | dm_put_live_table(md, *srcu_idx); |
6c182cd8 HR |
437 | msleep(10); |
438 | goto retry; | |
439 | } | |
971888c4 | 440 | |
e56f81e0 CH |
441 | return r; |
442 | } | |
443 | ||
971888c4 | 444 | static void dm_unprepare_ioctl(struct mapped_device *md, int srcu_idx) |
971888c4 MS |
445 | { |
446 | dm_put_live_table(md, srcu_idx); | |
447 | } | |
448 | ||
e56f81e0 CH |
449 | static int dm_blk_ioctl(struct block_device *bdev, fmode_t mode, |
450 | unsigned int cmd, unsigned long arg) | |
451 | { | |
452 | struct mapped_device *md = bdev->bd_disk->private_data; | |
971888c4 | 453 | int r, srcu_idx; |
e56f81e0 | 454 | |
5bd5e8d8 | 455 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
e56f81e0 | 456 | if (r < 0) |
971888c4 | 457 | goto out; |
6c182cd8 | 458 | |
e56f81e0 CH |
459 | if (r > 0) { |
460 | /* | |
e980f623 CH |
461 | * Target determined this ioctl is being issued against a |
462 | * subset of the parent bdev; require extra privileges. | |
e56f81e0 | 463 | */ |
e980f623 | 464 | if (!capable(CAP_SYS_RAWIO)) { |
0378c625 | 465 | DMDEBUG_LIMIT( |
e980f623 CH |
466 | "%s: sending ioctl %x to DM device without required privilege.", |
467 | current->comm, cmd); | |
468 | r = -ENOIOCTLCMD; | |
e56f81e0 | 469 | goto out; |
e980f623 | 470 | } |
e56f81e0 | 471 | } |
6c182cd8 | 472 | |
a7cb3d2f CH |
473 | if (!bdev->bd_disk->fops->ioctl) |
474 | r = -ENOTTY; | |
475 | else | |
476 | r = bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg); | |
e56f81e0 | 477 | out: |
971888c4 | 478 | dm_unprepare_ioctl(md, srcu_idx); |
aa129a22 MB |
479 | return r; |
480 | } | |
481 | ||
7465d7ac MS |
482 | u64 dm_start_time_ns_from_clone(struct bio *bio) |
483 | { | |
6c23f0bd | 484 | return jiffies_to_nsecs(clone_to_tio(bio)->io->start_time); |
7465d7ac MS |
485 | } |
486 | EXPORT_SYMBOL_GPL(dm_start_time_ns_from_clone); | |
487 | ||
488 | static void start_io_acct(struct dm_io *io) | |
489 | { | |
490 | struct mapped_device *md = io->md; | |
491 | struct bio *bio = io->orig_bio; | |
492 | ||
b879f915 | 493 | bio_start_io_acct_time(bio, io->start_time); |
7465d7ac MS |
494 | if (unlikely(dm_stats_used(&md->stats))) |
495 | dm_stats_account_io(&md->stats, bio_data_dir(bio), | |
496 | bio->bi_iter.bi_sector, bio_sectors(bio), | |
497 | false, 0, &io->stats_aux); | |
498 | } | |
499 | ||
d208b894 JL |
500 | static void end_io_acct(struct mapped_device *md, struct bio *bio, |
501 | unsigned long start_time, struct dm_stats_aux *stats_aux) | |
7465d7ac | 502 | { |
d208b894 | 503 | unsigned long duration = jiffies - start_time; |
7465d7ac | 504 | |
d208b894 | 505 | bio_end_io_acct(bio, start_time); |
7465d7ac MS |
506 | |
507 | if (unlikely(dm_stats_used(&md->stats))) | |
508 | dm_stats_account_io(&md->stats, bio_data_dir(bio), | |
509 | bio->bi_iter.bi_sector, bio_sectors(bio), | |
d208b894 | 510 | true, duration, stats_aux); |
7465d7ac MS |
511 | |
512 | /* nudge anyone waiting on suspend queue */ | |
513 | if (unlikely(wq_has_sleeper(&md->wait))) | |
514 | wake_up(&md->wait); | |
515 | } | |
978e51ba MS |
516 | |
517 | static struct dm_io *alloc_io(struct mapped_device *md, struct bio *bio) | |
1da177e4 | 518 | { |
64f52b0e MS |
519 | struct dm_io *io; |
520 | struct dm_target_io *tio; | |
521 | struct bio *clone; | |
522 | ||
609be106 | 523 | clone = bio_alloc_bioset(NULL, 0, 0, GFP_NOIO, &md->io_bs); |
64f52b0e | 524 | |
6c23f0bd | 525 | tio = clone_to_tio(clone); |
64f52b0e MS |
526 | tio->inside_dm_io = true; |
527 | tio->io = NULL; | |
528 | ||
529 | io = container_of(tio, struct dm_io, tio); | |
530 | io->magic = DM_IO_MAGIC; | |
978e51ba MS |
531 | io->status = 0; |
532 | atomic_set(&io->io_count, 1); | |
533 | io->orig_bio = bio; | |
534 | io->md = md; | |
535 | spin_lock_init(&io->endio_lock); | |
536 | ||
b879f915 | 537 | io->start_time = jiffies; |
64f52b0e MS |
538 | |
539 | return io; | |
1da177e4 LT |
540 | } |
541 | ||
028867ac | 542 | static void free_io(struct mapped_device *md, struct dm_io *io) |
1da177e4 | 543 | { |
64f52b0e MS |
544 | bio_put(&io->tio.clone); |
545 | } | |
546 | ||
1d1068ce | 547 | static struct bio *alloc_tio(struct clone_info *ci, struct dm_target *ti, |
dc8e2021 | 548 | unsigned target_bio_nr, unsigned *len, gfp_t gfp_mask) |
64f52b0e MS |
549 | { |
550 | struct dm_target_io *tio; | |
551 | ||
552 | if (!ci->io->tio.io) { | |
553 | /* the dm_target_io embedded in ci->io is available */ | |
554 | tio = &ci->io->tio; | |
555 | } else { | |
609be106 CH |
556 | struct bio *clone = bio_alloc_bioset(NULL, 0, 0, gfp_mask, |
557 | &ci->io->md->bs); | |
64f52b0e MS |
558 | if (!clone) |
559 | return NULL; | |
560 | ||
6c23f0bd | 561 | tio = clone_to_tio(clone); |
64f52b0e MS |
562 | tio->inside_dm_io = false; |
563 | } | |
dc8e2021 | 564 | __bio_clone_fast(&tio->clone, ci->bio); |
64f52b0e MS |
565 | |
566 | tio->magic = DM_TIO_MAGIC; | |
567 | tio->io = ci->io; | |
568 | tio->ti = ti; | |
569 | tio->target_bio_nr = target_bio_nr; | |
dc8e2021 | 570 | tio->len_ptr = len; |
64f52b0e | 571 | |
1d1068ce | 572 | return &tio->clone; |
1da177e4 LT |
573 | } |
574 | ||
1d1068ce | 575 | static void free_tio(struct bio *clone) |
1da177e4 | 576 | { |
1d1068ce | 577 | if (clone_to_tio(clone)->inside_dm_io) |
64f52b0e | 578 | return; |
1d1068ce | 579 | bio_put(clone); |
1da177e4 LT |
580 | } |
581 | ||
582 | /* | |
583 | * Add the bio to the list of deferred io. | |
584 | */ | |
92c63902 | 585 | static void queue_io(struct mapped_device *md, struct bio *bio) |
1da177e4 | 586 | { |
05447420 | 587 | unsigned long flags; |
1da177e4 | 588 | |
05447420 | 589 | spin_lock_irqsave(&md->deferred_lock, flags); |
1da177e4 | 590 | bio_list_add(&md->deferred, bio); |
05447420 | 591 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
6a8736d1 | 592 | queue_work(md->wq, &md->work); |
1da177e4 LT |
593 | } |
594 | ||
595 | /* | |
596 | * Everyone (including functions in this file), should use this | |
597 | * function to access the md->map field, and make sure they call | |
83d5e5b0 | 598 | * dm_put_live_table() when finished. |
1da177e4 | 599 | */ |
83d5e5b0 | 600 | struct dm_table *dm_get_live_table(struct mapped_device *md, int *srcu_idx) __acquires(md->io_barrier) |
1da177e4 | 601 | { |
83d5e5b0 MP |
602 | *srcu_idx = srcu_read_lock(&md->io_barrier); |
603 | ||
604 | return srcu_dereference(md->map, &md->io_barrier); | |
605 | } | |
1da177e4 | 606 | |
83d5e5b0 MP |
607 | void dm_put_live_table(struct mapped_device *md, int srcu_idx) __releases(md->io_barrier) |
608 | { | |
609 | srcu_read_unlock(&md->io_barrier, srcu_idx); | |
610 | } | |
611 | ||
612 | void dm_sync_table(struct mapped_device *md) | |
613 | { | |
614 | synchronize_srcu(&md->io_barrier); | |
615 | synchronize_rcu_expedited(); | |
616 | } | |
617 | ||
618 | /* | |
619 | * A fast alternative to dm_get_live_table/dm_put_live_table. | |
620 | * The caller must not block between these two functions. | |
621 | */ | |
622 | static struct dm_table *dm_get_live_table_fast(struct mapped_device *md) __acquires(RCU) | |
623 | { | |
624 | rcu_read_lock(); | |
625 | return rcu_dereference(md->map); | |
626 | } | |
1da177e4 | 627 | |
83d5e5b0 MP |
628 | static void dm_put_live_table_fast(struct mapped_device *md) __releases(RCU) |
629 | { | |
630 | rcu_read_unlock(); | |
1da177e4 LT |
631 | } |
632 | ||
971888c4 MS |
633 | static char *_dm_claim_ptr = "I belong to device-mapper"; |
634 | ||
86f1152b BM |
635 | /* |
636 | * Open a table device so we can use it as a map destination. | |
637 | */ | |
638 | static int open_table_device(struct table_device *td, dev_t dev, | |
639 | struct mapped_device *md) | |
640 | { | |
86f1152b | 641 | struct block_device *bdev; |
cd913c76 | 642 | u64 part_off; |
86f1152b BM |
643 | int r; |
644 | ||
645 | BUG_ON(td->dm_dev.bdev); | |
646 | ||
519049af | 647 | bdev = blkdev_get_by_dev(dev, td->dm_dev.mode | FMODE_EXCL, _dm_claim_ptr); |
86f1152b BM |
648 | if (IS_ERR(bdev)) |
649 | return PTR_ERR(bdev); | |
650 | ||
651 | r = bd_link_disk_holder(bdev, dm_disk(md)); | |
652 | if (r) { | |
653 | blkdev_put(bdev, td->dm_dev.mode | FMODE_EXCL); | |
654 | return r; | |
655 | } | |
656 | ||
657 | td->dm_dev.bdev = bdev; | |
cd913c76 | 658 | td->dm_dev.dax_dev = fs_dax_get_by_bdev(bdev, &part_off); |
86f1152b BM |
659 | return 0; |
660 | } | |
661 | ||
662 | /* | |
663 | * Close a table device that we've been using. | |
664 | */ | |
665 | static void close_table_device(struct table_device *td, struct mapped_device *md) | |
666 | { | |
667 | if (!td->dm_dev.bdev) | |
668 | return; | |
669 | ||
670 | bd_unlink_disk_holder(td->dm_dev.bdev, dm_disk(md)); | |
671 | blkdev_put(td->dm_dev.bdev, td->dm_dev.mode | FMODE_EXCL); | |
817bf402 | 672 | put_dax(td->dm_dev.dax_dev); |
86f1152b | 673 | td->dm_dev.bdev = NULL; |
817bf402 | 674 | td->dm_dev.dax_dev = NULL; |
86f1152b BM |
675 | } |
676 | ||
677 | static struct table_device *find_table_device(struct list_head *l, dev_t dev, | |
8454fca4 SS |
678 | fmode_t mode) |
679 | { | |
86f1152b BM |
680 | struct table_device *td; |
681 | ||
682 | list_for_each_entry(td, l, list) | |
683 | if (td->dm_dev.bdev->bd_dev == dev && td->dm_dev.mode == mode) | |
684 | return td; | |
685 | ||
686 | return NULL; | |
687 | } | |
688 | ||
689 | int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode, | |
8454fca4 SS |
690 | struct dm_dev **result) |
691 | { | |
86f1152b BM |
692 | int r; |
693 | struct table_device *td; | |
694 | ||
695 | mutex_lock(&md->table_devices_lock); | |
696 | td = find_table_device(&md->table_devices, dev, mode); | |
697 | if (!td) { | |
115485e8 | 698 | td = kmalloc_node(sizeof(*td), GFP_KERNEL, md->numa_node_id); |
86f1152b BM |
699 | if (!td) { |
700 | mutex_unlock(&md->table_devices_lock); | |
701 | return -ENOMEM; | |
702 | } | |
703 | ||
704 | td->dm_dev.mode = mode; | |
705 | td->dm_dev.bdev = NULL; | |
706 | ||
707 | if ((r = open_table_device(td, dev, md))) { | |
708 | mutex_unlock(&md->table_devices_lock); | |
709 | kfree(td); | |
710 | return r; | |
711 | } | |
712 | ||
713 | format_dev_t(td->dm_dev.name, dev); | |
714 | ||
b0b4d7c6 | 715 | refcount_set(&td->count, 1); |
86f1152b | 716 | list_add(&td->list, &md->table_devices); |
b0b4d7c6 ER |
717 | } else { |
718 | refcount_inc(&td->count); | |
86f1152b | 719 | } |
86f1152b BM |
720 | mutex_unlock(&md->table_devices_lock); |
721 | ||
722 | *result = &td->dm_dev; | |
723 | return 0; | |
724 | } | |
86f1152b BM |
725 | |
726 | void dm_put_table_device(struct mapped_device *md, struct dm_dev *d) | |
727 | { | |
728 | struct table_device *td = container_of(d, struct table_device, dm_dev); | |
729 | ||
730 | mutex_lock(&md->table_devices_lock); | |
b0b4d7c6 | 731 | if (refcount_dec_and_test(&td->count)) { |
86f1152b BM |
732 | close_table_device(td, md); |
733 | list_del(&td->list); | |
734 | kfree(td); | |
735 | } | |
736 | mutex_unlock(&md->table_devices_lock); | |
737 | } | |
86f1152b BM |
738 | |
739 | static void free_table_devices(struct list_head *devices) | |
740 | { | |
741 | struct list_head *tmp, *next; | |
742 | ||
743 | list_for_each_safe(tmp, next, devices) { | |
744 | struct table_device *td = list_entry(tmp, struct table_device, list); | |
745 | ||
746 | DMWARN("dm_destroy: %s still exists with %d references", | |
b0b4d7c6 | 747 | td->dm_dev.name, refcount_read(&td->count)); |
86f1152b BM |
748 | kfree(td); |
749 | } | |
750 | } | |
751 | ||
3ac51e74 DW |
752 | /* |
753 | * Get the geometry associated with a dm device | |
754 | */ | |
755 | int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo) | |
756 | { | |
757 | *geo = md->geometry; | |
758 | ||
759 | return 0; | |
760 | } | |
761 | ||
762 | /* | |
763 | * Set the geometry of a device. | |
764 | */ | |
765 | int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo) | |
766 | { | |
767 | sector_t sz = (sector_t)geo->cylinders * geo->heads * geo->sectors; | |
768 | ||
769 | if (geo->start > sz) { | |
770 | DMWARN("Start sector is beyond the geometry limits."); | |
771 | return -EINVAL; | |
772 | } | |
773 | ||
774 | md->geometry = *geo; | |
775 | ||
776 | return 0; | |
777 | } | |
778 | ||
2e93ccc1 KU |
779 | static int __noflush_suspending(struct mapped_device *md) |
780 | { | |
781 | return test_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); | |
782 | } | |
783 | ||
1da177e4 LT |
784 | /* |
785 | * Decrements the number of outstanding ios that a bio has been | |
786 | * cloned into, completing the original io if necc. | |
787 | */ | |
e2118b3c | 788 | void dm_io_dec_pending(struct dm_io *io, blk_status_t error) |
1da177e4 | 789 | { |
2e93ccc1 | 790 | unsigned long flags; |
4e4cbee9 | 791 | blk_status_t io_error; |
b35f8caa MB |
792 | struct bio *bio; |
793 | struct mapped_device *md = io->md; | |
d208b894 JL |
794 | unsigned long start_time = 0; |
795 | struct dm_stats_aux stats_aux; | |
2e93ccc1 KU |
796 | |
797 | /* Push-back supersedes any I/O errors */ | |
f88fb981 KU |
798 | if (unlikely(error)) { |
799 | spin_lock_irqsave(&io->endio_lock, flags); | |
745dc570 | 800 | if (!(io->status == BLK_STS_DM_REQUEUE && __noflush_suspending(md))) |
4e4cbee9 | 801 | io->status = error; |
f88fb981 KU |
802 | spin_unlock_irqrestore(&io->endio_lock, flags); |
803 | } | |
1da177e4 LT |
804 | |
805 | if (atomic_dec_and_test(&io->io_count)) { | |
bf14e2b2 | 806 | bio = io->orig_bio; |
4e4cbee9 | 807 | if (io->status == BLK_STS_DM_REQUEUE) { |
2e93ccc1 KU |
808 | /* |
809 | * Target requested pushing back the I/O. | |
2e93ccc1 | 810 | */ |
022c2611 | 811 | spin_lock_irqsave(&md->deferred_lock, flags); |
bf14e2b2 DLM |
812 | if (__noflush_suspending(md) && |
813 | !WARN_ON_ONCE(dm_is_zone_write(md, bio))) { | |
745dc570 | 814 | /* NOTE early return due to BLK_STS_DM_REQUEUE below */ |
bf14e2b2 DLM |
815 | bio_list_add_head(&md->deferred, bio); |
816 | } else { | |
817 | /* | |
818 | * noflush suspend was interrupted or this is | |
819 | * a write to a zoned target. | |
820 | */ | |
4e4cbee9 | 821 | io->status = BLK_STS_IOERR; |
bf14e2b2 | 822 | } |
022c2611 | 823 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
2e93ccc1 KU |
824 | } |
825 | ||
4e4cbee9 | 826 | io_error = io->status; |
d208b894 JL |
827 | start_time = io->start_time; |
828 | stats_aux = io->stats_aux; | |
6a8736d1 | 829 | free_io(md, io); |
d208b894 | 830 | end_io_acct(md, bio, start_time, &stats_aux); |
6a8736d1 | 831 | |
4e4cbee9 | 832 | if (io_error == BLK_STS_DM_REQUEUE) |
6a8736d1 | 833 | return; |
2e93ccc1 | 834 | |
1eff9d32 | 835 | if ((bio->bi_opf & REQ_PREFLUSH) && bio->bi_iter.bi_size) { |
af7e466a | 836 | /* |
6a8736d1 | 837 | * Preflush done for flush with data, reissue |
28a8f0d3 | 838 | * without REQ_PREFLUSH. |
af7e466a | 839 | */ |
1eff9d32 | 840 | bio->bi_opf &= ~REQ_PREFLUSH; |
6a8736d1 | 841 | queue_io(md, bio); |
af7e466a | 842 | } else { |
b372d360 | 843 | /* done with normal IO or empty flush */ |
8dd601fa N |
844 | if (io_error) |
845 | bio->bi_status = io_error; | |
4246a0b6 | 846 | bio_endio(bio); |
b35f8caa | 847 | } |
1da177e4 LT |
848 | } |
849 | } | |
850 | ||
bcb44433 MS |
851 | void disable_discard(struct mapped_device *md) |
852 | { | |
853 | struct queue_limits *limits = dm_get_queue_limits(md); | |
854 | ||
855 | /* device doesn't really support DISCARD, disable it */ | |
856 | limits->max_discard_sectors = 0; | |
857 | blk_queue_flag_clear(QUEUE_FLAG_DISCARD, md->queue); | |
858 | } | |
859 | ||
4cc96131 | 860 | void disable_write_same(struct mapped_device *md) |
7eee4ae2 MS |
861 | { |
862 | struct queue_limits *limits = dm_get_queue_limits(md); | |
863 | ||
864 | /* device doesn't really support WRITE SAME, disable it */ | |
865 | limits->max_write_same_sectors = 0; | |
866 | } | |
867 | ||
ac62d620 CH |
868 | void disable_write_zeroes(struct mapped_device *md) |
869 | { | |
870 | struct queue_limits *limits = dm_get_queue_limits(md); | |
871 | ||
872 | /* device doesn't really support WRITE ZEROES, disable it */ | |
873 | limits->max_write_zeroes_sectors = 0; | |
874 | } | |
875 | ||
a666e5c0 MP |
876 | static bool swap_bios_limit(struct dm_target *ti, struct bio *bio) |
877 | { | |
878 | return unlikely((bio->bi_opf & REQ_SWAP) != 0) && unlikely(ti->limit_swap_bios); | |
879 | } | |
880 | ||
4246a0b6 | 881 | static void clone_endio(struct bio *bio) |
1da177e4 | 882 | { |
4e4cbee9 | 883 | blk_status_t error = bio->bi_status; |
6c23f0bd | 884 | struct dm_target_io *tio = clone_to_tio(bio); |
b35f8caa | 885 | struct dm_io *io = tio->io; |
9faf400f | 886 | struct mapped_device *md = tio->io->md; |
1da177e4 | 887 | dm_endio_fn endio = tio->ti->type->end_io; |
309dca30 | 888 | struct request_queue *q = bio->bi_bdev->bd_disk->queue; |
1da177e4 | 889 | |
9c37de29 | 890 | if (unlikely(error == BLK_STS_TARGET)) { |
bcb44433 | 891 | if (bio_op(bio) == REQ_OP_DISCARD && |
309dca30 | 892 | !q->limits.max_discard_sectors) |
bcb44433 MS |
893 | disable_discard(md); |
894 | else if (bio_op(bio) == REQ_OP_WRITE_SAME && | |
309dca30 | 895 | !q->limits.max_write_same_sectors) |
ac62d620 | 896 | disable_write_same(md); |
bcb44433 | 897 | else if (bio_op(bio) == REQ_OP_WRITE_ZEROES && |
309dca30 | 898 | !q->limits.max_write_zeroes_sectors) |
ac62d620 CH |
899 | disable_write_zeroes(md); |
900 | } | |
7eee4ae2 | 901 | |
bb37d772 DLM |
902 | if (blk_queue_is_zoned(q)) |
903 | dm_zone_endio(io, bio); | |
415c79e1 | 904 | |
1be56909 | 905 | if (endio) { |
4e4cbee9 | 906 | int r = endio(tio->ti, bio, &error); |
1be56909 CH |
907 | switch (r) { |
908 | case DM_ENDIO_REQUEUE: | |
bf14e2b2 DLM |
909 | /* |
910 | * Requeuing writes to a sequential zone of a zoned | |
911 | * target will break the sequential write pattern: | |
912 | * fail such IO. | |
913 | */ | |
914 | if (WARN_ON_ONCE(dm_is_zone_write(md, bio))) | |
915 | error = BLK_STS_IOERR; | |
916 | else | |
917 | error = BLK_STS_DM_REQUEUE; | |
df561f66 | 918 | fallthrough; |
1be56909 CH |
919 | case DM_ENDIO_DONE: |
920 | break; | |
921 | case DM_ENDIO_INCOMPLETE: | |
922 | /* The target will handle the io */ | |
923 | return; | |
924 | default: | |
925 | DMWARN("unimplemented target endio return value: %d", r); | |
926 | BUG(); | |
927 | } | |
928 | } | |
929 | ||
a666e5c0 MP |
930 | if (unlikely(swap_bios_limit(tio->ti, bio))) { |
931 | struct mapped_device *md = io->md; | |
932 | up(&md->swap_bios_semaphore); | |
933 | } | |
934 | ||
1d1068ce | 935 | free_tio(bio); |
e2118b3c | 936 | dm_io_dec_pending(io, error); |
1da177e4 LT |
937 | } |
938 | ||
56a67df7 MS |
939 | /* |
940 | * Return maximum size of I/O possible at the supplied sector up to the current | |
941 | * target boundary. | |
942 | */ | |
3720281d MS |
943 | static inline sector_t max_io_len_target_boundary(struct dm_target *ti, |
944 | sector_t target_offset) | |
56a67df7 | 945 | { |
56a67df7 MS |
946 | return ti->len - target_offset; |
947 | } | |
948 | ||
3720281d | 949 | static sector_t max_io_len(struct dm_target *ti, sector_t sector) |
1da177e4 | 950 | { |
3720281d MS |
951 | sector_t target_offset = dm_target_offset(ti, sector); |
952 | sector_t len = max_io_len_target_boundary(ti, target_offset); | |
5091cdec | 953 | sector_t max_len; |
1da177e4 LT |
954 | |
955 | /* | |
3ee16db3 MS |
956 | * Does the target need to split IO even further? |
957 | * - varied (per target) IO splitting is a tenet of DM; this | |
958 | * explains why stacked chunk_sectors based splitting via | |
959 | * blk_max_size_offset() isn't possible here. So pass in | |
960 | * ti->max_io_len to override stacked chunk_sectors. | |
1da177e4 | 961 | */ |
3ee16db3 MS |
962 | if (ti->max_io_len) { |
963 | max_len = blk_max_size_offset(ti->table->md->queue, | |
964 | target_offset, ti->max_io_len); | |
965 | if (len > max_len) | |
966 | len = max_len; | |
967 | } | |
1da177e4 LT |
968 | |
969 | return len; | |
970 | } | |
971 | ||
542f9038 MS |
972 | int dm_set_target_max_io_len(struct dm_target *ti, sector_t len) |
973 | { | |
974 | if (len > UINT_MAX) { | |
975 | DMERR("Specified maximum size of target IO (%llu) exceeds limit (%u)", | |
976 | (unsigned long long)len, UINT_MAX); | |
977 | ti->error = "Maximum size of target IO is too large"; | |
978 | return -EINVAL; | |
979 | } | |
980 | ||
75ae1936 | 981 | ti->max_io_len = (uint32_t) len; |
542f9038 MS |
982 | |
983 | return 0; | |
984 | } | |
985 | EXPORT_SYMBOL_GPL(dm_set_target_max_io_len); | |
986 | ||
f26c5719 | 987 | static struct dm_target *dm_dax_get_live_target(struct mapped_device *md, |
3d97c829 MS |
988 | sector_t sector, int *srcu_idx) |
989 | __acquires(md->io_barrier) | |
545ed20e | 990 | { |
545ed20e TK |
991 | struct dm_table *map; |
992 | struct dm_target *ti; | |
545ed20e | 993 | |
f26c5719 | 994 | map = dm_get_live_table(md, srcu_idx); |
545ed20e | 995 | if (!map) |
f26c5719 | 996 | return NULL; |
545ed20e TK |
997 | |
998 | ti = dm_table_find_target(map, sector); | |
123d87d5 | 999 | if (!ti) |
f26c5719 | 1000 | return NULL; |
545ed20e | 1001 | |
f26c5719 DW |
1002 | return ti; |
1003 | } | |
545ed20e | 1004 | |
f26c5719 | 1005 | static long dm_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, |
3d97c829 | 1006 | long nr_pages, void **kaddr, pfn_t *pfn) |
f26c5719 DW |
1007 | { |
1008 | struct mapped_device *md = dax_get_private(dax_dev); | |
1009 | sector_t sector = pgoff * PAGE_SECTORS; | |
1010 | struct dm_target *ti; | |
1011 | long len, ret = -EIO; | |
1012 | int srcu_idx; | |
545ed20e | 1013 | |
f26c5719 | 1014 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); |
545ed20e | 1015 | |
f26c5719 DW |
1016 | if (!ti) |
1017 | goto out; | |
1018 | if (!ti->type->direct_access) | |
1019 | goto out; | |
3720281d | 1020 | len = max_io_len(ti, sector) / PAGE_SECTORS; |
f26c5719 DW |
1021 | if (len < 1) |
1022 | goto out; | |
1023 | nr_pages = min(len, nr_pages); | |
dbc62659 | 1024 | ret = ti->type->direct_access(ti, pgoff, nr_pages, kaddr, pfn); |
817bf402 | 1025 | |
f26c5719 | 1026 | out: |
545ed20e | 1027 | dm_put_live_table(md, srcu_idx); |
f26c5719 DW |
1028 | |
1029 | return ret; | |
545ed20e TK |
1030 | } |
1031 | ||
cdf6cdcd VG |
1032 | static int dm_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, |
1033 | size_t nr_pages) | |
1034 | { | |
1035 | struct mapped_device *md = dax_get_private(dax_dev); | |
1036 | sector_t sector = pgoff * PAGE_SECTORS; | |
1037 | struct dm_target *ti; | |
1038 | int ret = -EIO; | |
1039 | int srcu_idx; | |
1040 | ||
1041 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); | |
1042 | ||
1043 | if (!ti) | |
1044 | goto out; | |
1045 | if (WARN_ON(!ti->type->dax_zero_page_range)) { | |
1046 | /* | |
1047 | * ->zero_page_range() is mandatory dax operation. If we are | |
1048 | * here, something is wrong. | |
1049 | */ | |
cdf6cdcd VG |
1050 | goto out; |
1051 | } | |
1052 | ret = ti->type->dax_zero_page_range(ti, pgoff, nr_pages); | |
cdf6cdcd VG |
1053 | out: |
1054 | dm_put_live_table(md, srcu_idx); | |
1055 | ||
1056 | return ret; | |
1057 | } | |
1058 | ||
1dd40c3e MP |
1059 | /* |
1060 | * A target may call dm_accept_partial_bio only from the map routine. It is | |
6842d264 DLM |
1061 | * allowed for all bio types except REQ_PREFLUSH, REQ_OP_ZONE_* zone management |
1062 | * operations and REQ_OP_ZONE_APPEND (zone append writes). | |
1dd40c3e MP |
1063 | * |
1064 | * dm_accept_partial_bio informs the dm that the target only wants to process | |
1065 | * additional n_sectors sectors of the bio and the rest of the data should be | |
1066 | * sent in a next bio. | |
1067 | * | |
1068 | * A diagram that explains the arithmetics: | |
1069 | * +--------------------+---------------+-------+ | |
1070 | * | 1 | 2 | 3 | | |
1071 | * +--------------------+---------------+-------+ | |
1072 | * | |
1073 | * <-------------- *tio->len_ptr ---------------> | |
1074 | * <------- bi_size -------> | |
1075 | * <-- n_sectors --> | |
1076 | * | |
1077 | * Region 1 was already iterated over with bio_advance or similar function. | |
1078 | * (it may be empty if the target doesn't use bio_advance) | |
1079 | * Region 2 is the remaining bio size that the target wants to process. | |
1080 | * (it may be empty if region 1 is non-empty, although there is no reason | |
1081 | * to make it empty) | |
1082 | * The target requires that region 3 is to be sent in the next bio. | |
1083 | * | |
1084 | * If the target wants to receive multiple copies of the bio (via num_*bios, etc), | |
1085 | * the partially processed part (the sum of regions 1+2) must be the same for all | |
1086 | * copies of the bio. | |
1087 | */ | |
1088 | void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors) | |
1089 | { | |
6c23f0bd | 1090 | struct dm_target_io *tio = clone_to_tio(bio); |
1dd40c3e | 1091 | unsigned bi_size = bio->bi_iter.bi_size >> SECTOR_SHIFT; |
6842d264 | 1092 | |
1eff9d32 | 1093 | BUG_ON(bio->bi_opf & REQ_PREFLUSH); |
6842d264 DLM |
1094 | BUG_ON(op_is_zone_mgmt(bio_op(bio))); |
1095 | BUG_ON(bio_op(bio) == REQ_OP_ZONE_APPEND); | |
1dd40c3e MP |
1096 | BUG_ON(bi_size > *tio->len_ptr); |
1097 | BUG_ON(n_sectors > bi_size); | |
6842d264 | 1098 | |
1dd40c3e MP |
1099 | *tio->len_ptr -= bi_size - n_sectors; |
1100 | bio->bi_iter.bi_size = n_sectors << SECTOR_SHIFT; | |
1101 | } | |
1102 | EXPORT_SYMBOL_GPL(dm_accept_partial_bio); | |
1103 | ||
a666e5c0 MP |
1104 | static noinline void __set_swap_bios_limit(struct mapped_device *md, int latch) |
1105 | { | |
1106 | mutex_lock(&md->swap_bios_lock); | |
1107 | while (latch < md->swap_bios) { | |
1108 | cond_resched(); | |
1109 | down(&md->swap_bios_semaphore); | |
1110 | md->swap_bios--; | |
1111 | } | |
1112 | while (latch > md->swap_bios) { | |
1113 | cond_resched(); | |
1114 | up(&md->swap_bios_semaphore); | |
1115 | md->swap_bios++; | |
1116 | } | |
1117 | mutex_unlock(&md->swap_bios_lock); | |
1118 | } | |
1119 | ||
1561b396 | 1120 | static void __map_bio(struct bio *clone) |
1da177e4 | 1121 | { |
1561b396 | 1122 | struct dm_target_io *tio = clone_to_tio(clone); |
1da177e4 | 1123 | int r; |
2056a782 | 1124 | sector_t sector; |
64f52b0e | 1125 | struct dm_io *io = tio->io; |
bd2a49b8 | 1126 | struct dm_target *ti = tio->ti; |
1da177e4 | 1127 | |
1da177e4 | 1128 | clone->bi_end_io = clone_endio; |
1da177e4 LT |
1129 | |
1130 | /* | |
1131 | * Map the clone. If r == 0 we don't need to do | |
1132 | * anything, the target has assumed ownership of | |
1133 | * this io. | |
1134 | */ | |
e2118b3c | 1135 | dm_io_inc_pending(io); |
4f024f37 | 1136 | sector = clone->bi_iter.bi_sector; |
d67a5f4b | 1137 | |
a666e5c0 MP |
1138 | if (unlikely(swap_bios_limit(ti, clone))) { |
1139 | struct mapped_device *md = io->md; | |
1140 | int latch = get_swap_bios(); | |
1141 | if (unlikely(latch != md->swap_bios)) | |
1142 | __set_swap_bios_limit(md, latch); | |
1143 | down(&md->swap_bios_semaphore); | |
1144 | } | |
1145 | ||
bb37d772 DLM |
1146 | /* |
1147 | * Check if the IO needs a special mapping due to zone append emulation | |
1148 | * on zoned target. In this case, dm_zone_map_bio() calls the target | |
1149 | * map operation. | |
1150 | */ | |
1151 | if (dm_emulate_zone_append(io->md)) | |
1152 | r = dm_zone_map_bio(tio); | |
1153 | else | |
1154 | r = ti->type->map(ti, clone); | |
1155 | ||
846785e6 CH |
1156 | switch (r) { |
1157 | case DM_MAPIO_SUBMITTED: | |
1158 | break; | |
1159 | case DM_MAPIO_REMAPPED: | |
1da177e4 | 1160 | /* the bio has been remapped so dispatch it */ |
1c02fca6 | 1161 | trace_block_bio_remap(clone, bio_dev(io->orig_bio), sector); |
3e08773c | 1162 | submit_bio_noacct(clone); |
846785e6 CH |
1163 | break; |
1164 | case DM_MAPIO_KILL: | |
a666e5c0 MP |
1165 | if (unlikely(swap_bios_limit(ti, clone))) { |
1166 | struct mapped_device *md = io->md; | |
1167 | up(&md->swap_bios_semaphore); | |
1168 | } | |
1d1068ce | 1169 | free_tio(clone); |
e2118b3c | 1170 | dm_io_dec_pending(io, BLK_STS_IOERR); |
4e4cbee9 | 1171 | break; |
846785e6 | 1172 | case DM_MAPIO_REQUEUE: |
a666e5c0 MP |
1173 | if (unlikely(swap_bios_limit(ti, clone))) { |
1174 | struct mapped_device *md = io->md; | |
1175 | up(&md->swap_bios_semaphore); | |
1176 | } | |
1d1068ce | 1177 | free_tio(clone); |
e2118b3c | 1178 | dm_io_dec_pending(io, BLK_STS_DM_REQUEUE); |
846785e6 CH |
1179 | break; |
1180 | default: | |
45cbcd79 KU |
1181 | DMWARN("unimplemented target map return value: %d", r); |
1182 | BUG(); | |
1da177e4 LT |
1183 | } |
1184 | } | |
1da177e4 | 1185 | |
e0d6609a | 1186 | static void bio_setup_sector(struct bio *bio, sector_t sector, unsigned len) |
bd2a49b8 | 1187 | { |
4f024f37 KO |
1188 | bio->bi_iter.bi_sector = sector; |
1189 | bio->bi_iter.bi_size = to_bytes(len); | |
1da177e4 LT |
1190 | } |
1191 | ||
1192 | /* | |
1193 | * Creates a bio that consists of range of complete bvecs. | |
1194 | */ | |
b1bee792 CH |
1195 | static int __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti, |
1196 | sector_t sector, unsigned *len) | |
1da177e4 | 1197 | { |
b1bee792 | 1198 | struct bio *bio = ci->bio, *clone; |
07560151 | 1199 | int r; |
1da177e4 | 1200 | |
1d1068ce | 1201 | clone = alloc_tio(ci, ti, 0, len, GFP_NOIO); |
1c3b13e6 | 1202 | |
07560151 EB |
1203 | r = bio_crypt_clone(clone, bio, GFP_NOIO); |
1204 | if (r < 0) | |
b1bee792 | 1205 | goto free_tio; |
a892c8d5 | 1206 | |
57c36519 | 1207 | if (bio_integrity(bio)) { |
1d1068ce CH |
1208 | struct dm_target_io *tio = clone_to_tio(clone); |
1209 | ||
e2460f2a MP |
1210 | if (unlikely(!dm_target_has_integrity(tio->ti->type) && |
1211 | !dm_target_passes_integrity(tio->ti->type))) { | |
1212 | DMWARN("%s: the target %s doesn't support integrity data.", | |
1213 | dm_device_name(tio->io->md), | |
1214 | tio->ti->type->name); | |
b1bee792 CH |
1215 | r = -EIO; |
1216 | goto free_tio; | |
e2460f2a MP |
1217 | } |
1218 | ||
1219 | r = bio_integrity_clone(clone, bio, GFP_NOIO); | |
c80914e8 | 1220 | if (r < 0) |
b1bee792 | 1221 | goto free_tio; |
c80914e8 | 1222 | } |
bd2a49b8 | 1223 | |
fa8db494 | 1224 | bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector)); |
b1bee792 | 1225 | clone->bi_iter.bi_size = to_bytes(*len); |
fa8db494 MS |
1226 | |
1227 | if (bio_integrity(bio)) | |
1228 | bio_integrity_trim(clone); | |
c80914e8 | 1229 | |
1561b396 | 1230 | __map_bio(clone); |
c80914e8 | 1231 | return 0; |
b1bee792 | 1232 | free_tio: |
1d1068ce | 1233 | free_tio(clone); |
b1bee792 | 1234 | return r; |
1da177e4 LT |
1235 | } |
1236 | ||
318716dd | 1237 | static void alloc_multiple_bios(struct bio_list *blist, struct clone_info *ci, |
dc8e2021 CH |
1238 | struct dm_target *ti, unsigned num_bios, |
1239 | unsigned *len) | |
f9ab94ce | 1240 | { |
1d1068ce | 1241 | struct bio *bio; |
318716dd | 1242 | int try; |
dba14160 | 1243 | |
318716dd MS |
1244 | if (!num_bios) |
1245 | return; | |
f9ab94ce | 1246 | |
318716dd | 1247 | if (num_bios == 1) { |
1d1068ce CH |
1248 | bio = alloc_tio(ci, ti, 0, len, GFP_NOIO); |
1249 | bio_list_add(blist, bio); | |
318716dd MS |
1250 | return; |
1251 | } | |
9015df24 | 1252 | |
318716dd MS |
1253 | for (try = 0; try < 2; try++) { |
1254 | int bio_nr; | |
318716dd MS |
1255 | |
1256 | if (try) | |
bc02cdbe | 1257 | mutex_lock(&ci->io->md->table_devices_lock); |
318716dd | 1258 | for (bio_nr = 0; bio_nr < num_bios; bio_nr++) { |
1d1068ce | 1259 | bio = alloc_tio(ci, ti, bio_nr, len, |
dc8e2021 | 1260 | try ? GFP_NOIO : GFP_NOWAIT); |
1d1068ce | 1261 | if (!bio) |
318716dd MS |
1262 | break; |
1263 | ||
1d1068ce | 1264 | bio_list_add(blist, bio); |
318716dd MS |
1265 | } |
1266 | if (try) | |
bc02cdbe | 1267 | mutex_unlock(&ci->io->md->table_devices_lock); |
318716dd MS |
1268 | if (bio_nr == num_bios) |
1269 | return; | |
1270 | ||
6c23f0bd | 1271 | while ((bio = bio_list_pop(blist))) |
1d1068ce | 1272 | free_tio(bio); |
318716dd | 1273 | } |
9015df24 AK |
1274 | } |
1275 | ||
14fe594d | 1276 | static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti, |
1dd40c3e | 1277 | unsigned num_bios, unsigned *len) |
06a426ce | 1278 | { |
318716dd | 1279 | struct bio_list blist = BIO_EMPTY_LIST; |
8eabf5d0 | 1280 | struct bio *clone; |
318716dd | 1281 | |
dc8e2021 | 1282 | alloc_multiple_bios(&blist, ci, ti, num_bios, len); |
06a426ce | 1283 | |
8eabf5d0 | 1284 | while ((clone = bio_list_pop(&blist))) { |
8eabf5d0 CH |
1285 | if (len) |
1286 | bio_setup_sector(clone, ci->sector, *len); | |
1561b396 | 1287 | __map_bio(clone); |
8eabf5d0 | 1288 | } |
06a426ce MS |
1289 | } |
1290 | ||
14fe594d | 1291 | static int __send_empty_flush(struct clone_info *ci) |
f9ab94ce | 1292 | { |
06a426ce | 1293 | unsigned target_nr = 0; |
f9ab94ce | 1294 | struct dm_target *ti; |
828678b8 MS |
1295 | struct bio flush_bio; |
1296 | ||
1297 | /* | |
1298 | * Use an on-stack bio for this, it's safe since we don't | |
1299 | * need to reference it after submit. It's just used as | |
1300 | * the basis for the clone(s). | |
1301 | */ | |
49add496 CH |
1302 | bio_init(&flush_bio, ci->io->md->disk->part0, NULL, 0, |
1303 | REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC); | |
47d95102 | 1304 | |
828678b8 MS |
1305 | ci->bio = &flush_bio; |
1306 | ci->sector_count = 0; | |
f9ab94ce | 1307 | |
b372d360 | 1308 | BUG_ON(bio_has_data(ci->bio)); |
f9ab94ce | 1309 | while ((ti = dm_table_get_target(ci->map, target_nr++))) |
1dd40c3e | 1310 | __send_duplicate_bios(ci, ti, ti->num_flush_bios, NULL); |
828678b8 MS |
1311 | |
1312 | bio_uninit(ci->bio); | |
f9ab94ce MP |
1313 | return 0; |
1314 | } | |
1315 | ||
3d7f4562 | 1316 | static int __send_changing_extent_only(struct clone_info *ci, struct dm_target *ti, |
61697a6a | 1317 | unsigned num_bios) |
ba1cbad9 | 1318 | { |
51b86f9a | 1319 | unsigned len; |
ba1cbad9 | 1320 | |
3d7f4562 MS |
1321 | /* |
1322 | * Even though the device advertised support for this type of | |
1323 | * request, that does not mean every target supports it, and | |
1324 | * reconfiguration might also have changed that since the | |
1325 | * check was performed. | |
1326 | */ | |
3d7f4562 MS |
1327 | if (!num_bios) |
1328 | return -EOPNOTSUPP; | |
ba1cbad9 | 1329 | |
3720281d MS |
1330 | len = min_t(sector_t, ci->sector_count, |
1331 | max_io_len_target_boundary(ti, dm_target_offset(ti, ci->sector))); | |
51b86f9a | 1332 | |
3d7f4562 | 1333 | __send_duplicate_bios(ci, ti, num_bios, &len); |
e262f347 | 1334 | |
3d7f4562 MS |
1335 | ci->sector += len; |
1336 | ci->sector_count -= len; | |
5ae89a87 MS |
1337 | |
1338 | return 0; | |
ba1cbad9 MS |
1339 | } |
1340 | ||
568c73a3 MS |
1341 | static bool is_abnormal_io(struct bio *bio) |
1342 | { | |
1343 | bool r = false; | |
1344 | ||
1345 | switch (bio_op(bio)) { | |
1346 | case REQ_OP_DISCARD: | |
1347 | case REQ_OP_SECURE_ERASE: | |
1348 | case REQ_OP_WRITE_SAME: | |
1349 | case REQ_OP_WRITE_ZEROES: | |
1350 | r = true; | |
1351 | break; | |
1352 | } | |
1353 | ||
1354 | return r; | |
1355 | } | |
1356 | ||
0519c71e MS |
1357 | static bool __process_abnormal_io(struct clone_info *ci, struct dm_target *ti, |
1358 | int *result) | |
1359 | { | |
1360 | struct bio *bio = ci->bio; | |
9679b5a7 | 1361 | unsigned num_bios = 0; |
0519c71e | 1362 | |
9679b5a7 MS |
1363 | switch (bio_op(bio)) { |
1364 | case REQ_OP_DISCARD: | |
1365 | num_bios = ti->num_discard_bios; | |
1366 | break; | |
1367 | case REQ_OP_SECURE_ERASE: | |
1368 | num_bios = ti->num_secure_erase_bios; | |
1369 | break; | |
1370 | case REQ_OP_WRITE_SAME: | |
1371 | num_bios = ti->num_write_same_bios; | |
1372 | break; | |
1373 | case REQ_OP_WRITE_ZEROES: | |
1374 | num_bios = ti->num_write_zeroes_bios; | |
1375 | break; | |
1376 | default: | |
0519c71e | 1377 | return false; |
9679b5a7 | 1378 | } |
0519c71e | 1379 | |
9679b5a7 | 1380 | *result = __send_changing_extent_only(ci, ti, num_bios); |
0519c71e MS |
1381 | return true; |
1382 | } | |
1383 | ||
e4c93811 AK |
1384 | /* |
1385 | * Select the correct strategy for processing a non-flush bio. | |
1386 | */ | |
14fe594d | 1387 | static int __split_and_process_non_flush(struct clone_info *ci) |
0ce65797 | 1388 | { |
512875bd | 1389 | struct dm_target *ti; |
1c3b13e6 | 1390 | unsigned len; |
c80914e8 | 1391 | int r; |
0ce65797 | 1392 | |
512875bd | 1393 | ti = dm_table_find_target(ci->map, ci->sector); |
123d87d5 | 1394 | if (!ti) |
512875bd JN |
1395 | return -EIO; |
1396 | ||
568c73a3 | 1397 | if (__process_abnormal_io(ci, ti, &r)) |
0519c71e | 1398 | return r; |
3d7f4562 | 1399 | |
3720281d | 1400 | len = min_t(sector_t, max_io_len(ti, ci->sector), ci->sector_count); |
0ce65797 | 1401 | |
c80914e8 MS |
1402 | r = __clone_and_map_data_bio(ci, ti, ci->sector, &len); |
1403 | if (r < 0) | |
1404 | return r; | |
0ce65797 | 1405 | |
1c3b13e6 KO |
1406 | ci->sector += len; |
1407 | ci->sector_count -= len; | |
0ce65797 | 1408 | |
1c3b13e6 | 1409 | return 0; |
0ce65797 MS |
1410 | } |
1411 | ||
978e51ba MS |
1412 | static void init_clone_info(struct clone_info *ci, struct mapped_device *md, |
1413 | struct dm_table *map, struct bio *bio) | |
1414 | { | |
1415 | ci->map = map; | |
1416 | ci->io = alloc_io(md, bio); | |
1417 | ci->sector = bio->bi_iter.bi_sector; | |
1418 | } | |
1419 | ||
1da177e4 | 1420 | /* |
14fe594d | 1421 | * Entry point to split a bio into clones and submit them to the targets. |
1da177e4 | 1422 | */ |
3e08773c | 1423 | static void __split_and_process_bio(struct mapped_device *md, |
978e51ba | 1424 | struct dm_table *map, struct bio *bio) |
0ce65797 | 1425 | { |
1da177e4 | 1426 | struct clone_info ci; |
512875bd | 1427 | int error = 0; |
1da177e4 | 1428 | |
978e51ba | 1429 | init_clone_info(&ci, md, map, bio); |
0ce65797 | 1430 | |
1eff9d32 | 1431 | if (bio->bi_opf & REQ_PREFLUSH) { |
14fe594d | 1432 | error = __send_empty_flush(&ci); |
e2118b3c | 1433 | /* dm_io_dec_pending submits any data associated with flush */ |
2e2d6f7e | 1434 | } else if (op_is_zone_mgmt(bio_op(bio))) { |
a4aa5e56 DLM |
1435 | ci.bio = bio; |
1436 | ci.sector_count = 0; | |
1437 | error = __split_and_process_non_flush(&ci); | |
b372d360 | 1438 | } else { |
6a8736d1 | 1439 | ci.bio = bio; |
d87f4c14 | 1440 | ci.sector_count = bio_sectors(bio); |
8615cb65 MP |
1441 | error = __split_and_process_non_flush(&ci); |
1442 | if (ci.sector_count && !error) { | |
1443 | /* | |
1444 | * Remainder must be passed to submit_bio_noacct() | |
1445 | * so that it gets handled *after* bios already submitted | |
1446 | * have been completely processed. | |
1447 | * We take a clone of the original to store in | |
1448 | * ci.io->orig_bio to be used by end_io_acct() and | |
1449 | * for dec_pending to use for completion handling. | |
1450 | */ | |
1451 | struct bio *b = bio_split(bio, bio_sectors(bio) - ci.sector_count, | |
1452 | GFP_NOIO, &md->queue->bio_split); | |
1453 | ci.io->orig_bio = b; | |
1454 | ||
8615cb65 MP |
1455 | bio_chain(b, bio); |
1456 | trace_block_split(b, bio->bi_iter.bi_sector); | |
3e08773c | 1457 | submit_bio_noacct(bio); |
18a25da8 | 1458 | } |
d87f4c14 | 1459 | } |
b879f915 | 1460 | start_io_acct(ci.io); |
0ce65797 | 1461 | |
1da177e4 | 1462 | /* drop the extra reference count */ |
e2118b3c | 1463 | dm_io_dec_pending(ci.io, errno_to_blk_status(error)); |
0ce65797 MS |
1464 | } |
1465 | ||
3e08773c | 1466 | static void dm_submit_bio(struct bio *bio) |
cec47e3d | 1467 | { |
309dca30 | 1468 | struct mapped_device *md = bio->bi_bdev->bd_disk->private_data; |
83d5e5b0 MP |
1469 | int srcu_idx; |
1470 | struct dm_table *map; | |
cec47e3d | 1471 | |
83d5e5b0 | 1472 | map = dm_get_live_table(md, &srcu_idx); |
b2abdb1b MS |
1473 | if (unlikely(!map)) { |
1474 | DMERR_LIMIT("%s: mapping table unavailable, erroring io", | |
1475 | dm_device_name(md)); | |
1476 | bio_io_error(bio); | |
1477 | goto out; | |
1478 | } | |
29e4013d | 1479 | |
b2abdb1b | 1480 | /* If suspended, queue this IO for later */ |
6a8736d1 | 1481 | if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags))) { |
6abc4946 KK |
1482 | if (bio->bi_opf & REQ_NOWAIT) |
1483 | bio_wouldblock_error(bio); | |
b2abdb1b | 1484 | else if (bio->bi_opf & REQ_RAHEAD) |
54d9a1b4 | 1485 | bio_io_error(bio); |
b2abdb1b MS |
1486 | else |
1487 | queue_io(md, bio); | |
1488 | goto out; | |
cec47e3d | 1489 | } |
1da177e4 | 1490 | |
b2abdb1b MS |
1491 | /* |
1492 | * Use blk_queue_split() for abnormal IO (e.g. discard, writesame, etc) | |
1493 | * otherwise associated queue_limits won't be imposed. | |
1494 | */ | |
1495 | if (is_abnormal_io(bio)) | |
1496 | blk_queue_split(&bio); | |
978e51ba | 1497 | |
3e08773c | 1498 | __split_and_process_bio(md, map, bio); |
b2abdb1b | 1499 | out: |
83d5e5b0 | 1500 | dm_put_live_table(md, srcu_idx); |
978e51ba MS |
1501 | } |
1502 | ||
1da177e4 LT |
1503 | /*----------------------------------------------------------------- |
1504 | * An IDR is used to keep track of allocated minor numbers. | |
1505 | *---------------------------------------------------------------*/ | |
2b06cfff | 1506 | static void free_minor(int minor) |
1da177e4 | 1507 | { |
f32c10b0 | 1508 | spin_lock(&_minor_lock); |
1da177e4 | 1509 | idr_remove(&_minor_idr, minor); |
f32c10b0 | 1510 | spin_unlock(&_minor_lock); |
1da177e4 LT |
1511 | } |
1512 | ||
1513 | /* | |
1514 | * See if the device with a specific minor # is free. | |
1515 | */ | |
cf13ab8e | 1516 | static int specific_minor(int minor) |
1da177e4 | 1517 | { |
c9d76be6 | 1518 | int r; |
1da177e4 LT |
1519 | |
1520 | if (minor >= (1 << MINORBITS)) | |
1521 | return -EINVAL; | |
1522 | ||
c9d76be6 | 1523 | idr_preload(GFP_KERNEL); |
f32c10b0 | 1524 | spin_lock(&_minor_lock); |
1da177e4 | 1525 | |
c9d76be6 | 1526 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, minor, minor + 1, GFP_NOWAIT); |
1da177e4 | 1527 | |
f32c10b0 | 1528 | spin_unlock(&_minor_lock); |
c9d76be6 TH |
1529 | idr_preload_end(); |
1530 | if (r < 0) | |
1531 | return r == -ENOSPC ? -EBUSY : r; | |
1532 | return 0; | |
1da177e4 LT |
1533 | } |
1534 | ||
cf13ab8e | 1535 | static int next_free_minor(int *minor) |
1da177e4 | 1536 | { |
c9d76be6 | 1537 | int r; |
62f75c2f | 1538 | |
c9d76be6 | 1539 | idr_preload(GFP_KERNEL); |
f32c10b0 | 1540 | spin_lock(&_minor_lock); |
1da177e4 | 1541 | |
c9d76be6 | 1542 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, 0, 1 << MINORBITS, GFP_NOWAIT); |
1da177e4 | 1543 | |
f32c10b0 | 1544 | spin_unlock(&_minor_lock); |
c9d76be6 TH |
1545 | idr_preload_end(); |
1546 | if (r < 0) | |
1547 | return r; | |
1548 | *minor = r; | |
1549 | return 0; | |
1da177e4 LT |
1550 | } |
1551 | ||
83d5cde4 | 1552 | static const struct block_device_operations dm_blk_dops; |
681cc5e8 | 1553 | static const struct block_device_operations dm_rq_blk_dops; |
f26c5719 | 1554 | static const struct dax_operations dm_dax_ops; |
1da177e4 | 1555 | |
53d5914f MP |
1556 | static void dm_wq_work(struct work_struct *work); |
1557 | ||
aa6ce87a | 1558 | #ifdef CONFIG_BLK_INLINE_ENCRYPTION |
cb77cb5a | 1559 | static void dm_queue_destroy_crypto_profile(struct request_queue *q) |
aa6ce87a | 1560 | { |
cb77cb5a | 1561 | dm_destroy_crypto_profile(q->crypto_profile); |
aa6ce87a ST |
1562 | } |
1563 | ||
1564 | #else /* CONFIG_BLK_INLINE_ENCRYPTION */ | |
1565 | ||
cb77cb5a | 1566 | static inline void dm_queue_destroy_crypto_profile(struct request_queue *q) |
aa6ce87a ST |
1567 | { |
1568 | } | |
1569 | #endif /* !CONFIG_BLK_INLINE_ENCRYPTION */ | |
1570 | ||
0f20972f MS |
1571 | static void cleanup_mapped_device(struct mapped_device *md) |
1572 | { | |
0f20972f MS |
1573 | if (md->wq) |
1574 | destroy_workqueue(md->wq); | |
6f1c819c KO |
1575 | bioset_exit(&md->bs); |
1576 | bioset_exit(&md->io_bs); | |
0f20972f | 1577 | |
f26c5719 | 1578 | if (md->dax_dev) { |
fb08a190 | 1579 | dax_remove_host(md->disk); |
f26c5719 DW |
1580 | kill_dax(md->dax_dev); |
1581 | put_dax(md->dax_dev); | |
1582 | md->dax_dev = NULL; | |
1583 | } | |
1584 | ||
0f20972f MS |
1585 | if (md->disk) { |
1586 | spin_lock(&_minor_lock); | |
1587 | md->disk->private_data = NULL; | |
1588 | spin_unlock(&_minor_lock); | |
89f871af CH |
1589 | if (dm_get_md_type(md) != DM_TYPE_NONE) { |
1590 | dm_sysfs_exit(md); | |
1591 | del_gendisk(md->disk); | |
1592 | } | |
cb77cb5a | 1593 | dm_queue_destroy_crypto_profile(md->queue); |
74fe6ba9 | 1594 | blk_cleanup_disk(md->disk); |
74a2b6ec | 1595 | } |
0f20972f | 1596 | |
d09960b0 TE |
1597 | cleanup_srcu_struct(&md->io_barrier); |
1598 | ||
d5ffebdd MS |
1599 | mutex_destroy(&md->suspend_lock); |
1600 | mutex_destroy(&md->type_lock); | |
1601 | mutex_destroy(&md->table_devices_lock); | |
a666e5c0 | 1602 | mutex_destroy(&md->swap_bios_lock); |
d5ffebdd | 1603 | |
4cc96131 | 1604 | dm_mq_cleanup_mapped_device(md); |
bb37d772 | 1605 | dm_cleanup_zoned_dev(md); |
0f20972f MS |
1606 | } |
1607 | ||
1da177e4 LT |
1608 | /* |
1609 | * Allocate and initialise a blank device with a given minor. | |
1610 | */ | |
2b06cfff | 1611 | static struct mapped_device *alloc_dev(int minor) |
1da177e4 | 1612 | { |
115485e8 MS |
1613 | int r, numa_node_id = dm_get_numa_node(); |
1614 | struct mapped_device *md; | |
ba61fdd1 | 1615 | void *old_md; |
1da177e4 | 1616 | |
856eb091 | 1617 | md = kvzalloc_node(sizeof(*md), GFP_KERNEL, numa_node_id); |
1da177e4 LT |
1618 | if (!md) { |
1619 | DMWARN("unable to allocate device, out of memory."); | |
1620 | return NULL; | |
1621 | } | |
1622 | ||
10da4f79 | 1623 | if (!try_module_get(THIS_MODULE)) |
6ed7ade8 | 1624 | goto bad_module_get; |
10da4f79 | 1625 | |
1da177e4 | 1626 | /* get a minor number for the dev */ |
2b06cfff | 1627 | if (minor == DM_ANY_MINOR) |
cf13ab8e | 1628 | r = next_free_minor(&minor); |
2b06cfff | 1629 | else |
cf13ab8e | 1630 | r = specific_minor(minor); |
1da177e4 | 1631 | if (r < 0) |
6ed7ade8 | 1632 | goto bad_minor; |
1da177e4 | 1633 | |
83d5e5b0 MP |
1634 | r = init_srcu_struct(&md->io_barrier); |
1635 | if (r < 0) | |
1636 | goto bad_io_barrier; | |
1637 | ||
115485e8 | 1638 | md->numa_node_id = numa_node_id; |
591ddcfc | 1639 | md->init_tio_pdu = false; |
a5664dad | 1640 | md->type = DM_TYPE_NONE; |
e61290a4 | 1641 | mutex_init(&md->suspend_lock); |
a5664dad | 1642 | mutex_init(&md->type_lock); |
86f1152b | 1643 | mutex_init(&md->table_devices_lock); |
022c2611 | 1644 | spin_lock_init(&md->deferred_lock); |
1da177e4 | 1645 | atomic_set(&md->holders, 1); |
5c6bd75d | 1646 | atomic_set(&md->open_count, 0); |
1da177e4 | 1647 | atomic_set(&md->event_nr, 0); |
7a8c3d3b MA |
1648 | atomic_set(&md->uevent_seq, 0); |
1649 | INIT_LIST_HEAD(&md->uevent_list); | |
86f1152b | 1650 | INIT_LIST_HEAD(&md->table_devices); |
7a8c3d3b | 1651 | spin_lock_init(&md->uevent_lock); |
1da177e4 | 1652 | |
47ace7e0 | 1653 | /* |
c62b37d9 CH |
1654 | * default to bio-based until DM table is loaded and md->type |
1655 | * established. If request-based table is loaded: blk-mq will | |
1656 | * override accordingly. | |
47ace7e0 | 1657 | */ |
74fe6ba9 | 1658 | md->disk = blk_alloc_disk(md->numa_node_id); |
1da177e4 | 1659 | if (!md->disk) |
0f20972f | 1660 | goto bad; |
74fe6ba9 | 1661 | md->queue = md->disk->queue; |
1da177e4 | 1662 | |
f0b04115 | 1663 | init_waitqueue_head(&md->wait); |
53d5914f | 1664 | INIT_WORK(&md->work, dm_wq_work); |
f0b04115 | 1665 | init_waitqueue_head(&md->eventq); |
2995fa78 | 1666 | init_completion(&md->kobj_holder.completion); |
f0b04115 | 1667 | |
a666e5c0 MP |
1668 | md->swap_bios = get_swap_bios(); |
1669 | sema_init(&md->swap_bios_semaphore, md->swap_bios); | |
1670 | mutex_init(&md->swap_bios_lock); | |
1671 | ||
1da177e4 LT |
1672 | md->disk->major = _major; |
1673 | md->disk->first_minor = minor; | |
74fe6ba9 | 1674 | md->disk->minors = 1; |
1ebe2e5f | 1675 | md->disk->flags |= GENHD_FL_NO_PART; |
1da177e4 LT |
1676 | md->disk->fops = &dm_blk_dops; |
1677 | md->disk->queue = md->queue; | |
1678 | md->disk->private_data = md; | |
1679 | sprintf(md->disk->disk_name, "dm-%d", minor); | |
f26c5719 | 1680 | |
5d2a228b | 1681 | if (IS_ENABLED(CONFIG_FS_DAX)) { |
30c6828a | 1682 | md->dax_dev = alloc_dax(md, &dm_dax_ops); |
d7519392 CH |
1683 | if (IS_ERR(md->dax_dev)) { |
1684 | md->dax_dev = NULL; | |
976431b0 | 1685 | goto bad; |
d7519392 | 1686 | } |
7ac5360c CH |
1687 | set_dax_nocache(md->dax_dev); |
1688 | set_dax_nomc(md->dax_dev); | |
fb08a190 | 1689 | if (dax_add_host(md->dax_dev, md->disk)) |
976431b0 DW |
1690 | goto bad; |
1691 | } | |
f26c5719 | 1692 | |
7e51f257 | 1693 | format_dev_t(md->name, MKDEV(_major, minor)); |
1da177e4 | 1694 | |
c7c879ee | 1695 | md->wq = alloc_workqueue("kdmflush/%s", WQ_MEM_RECLAIM, 0, md->name); |
304f3f6a | 1696 | if (!md->wq) |
0f20972f | 1697 | goto bad; |
304f3f6a | 1698 | |
fd2ed4d2 MP |
1699 | dm_stats_init(&md->stats); |
1700 | ||
ba61fdd1 | 1701 | /* Populate the mapping, nobody knows we exist yet */ |
f32c10b0 | 1702 | spin_lock(&_minor_lock); |
ba61fdd1 | 1703 | old_md = idr_replace(&_minor_idr, md, minor); |
f32c10b0 | 1704 | spin_unlock(&_minor_lock); |
ba61fdd1 JM |
1705 | |
1706 | BUG_ON(old_md != MINOR_ALLOCED); | |
1707 | ||
1da177e4 LT |
1708 | return md; |
1709 | ||
0f20972f MS |
1710 | bad: |
1711 | cleanup_mapped_device(md); | |
83d5e5b0 | 1712 | bad_io_barrier: |
1da177e4 | 1713 | free_minor(minor); |
6ed7ade8 | 1714 | bad_minor: |
10da4f79 | 1715 | module_put(THIS_MODULE); |
6ed7ade8 | 1716 | bad_module_get: |
856eb091 | 1717 | kvfree(md); |
1da177e4 LT |
1718 | return NULL; |
1719 | } | |
1720 | ||
ae9da83f JN |
1721 | static void unlock_fs(struct mapped_device *md); |
1722 | ||
1da177e4 LT |
1723 | static void free_dev(struct mapped_device *md) |
1724 | { | |
f331c029 | 1725 | int minor = MINOR(disk_devt(md->disk)); |
63d94e48 | 1726 | |
32a926da | 1727 | unlock_fs(md); |
2eb6e1e3 | 1728 | |
0f20972f | 1729 | cleanup_mapped_device(md); |
63a4f065 | 1730 | |
86f1152b | 1731 | free_table_devices(&md->table_devices); |
63a4f065 | 1732 | dm_stats_cleanup(&md->stats); |
63a4f065 MS |
1733 | free_minor(minor); |
1734 | ||
10da4f79 | 1735 | module_put(THIS_MODULE); |
856eb091 | 1736 | kvfree(md); |
1da177e4 LT |
1737 | } |
1738 | ||
2a2a4c51 | 1739 | static int __bind_mempools(struct mapped_device *md, struct dm_table *t) |
e6ee8c0b | 1740 | { |
c0820cf5 | 1741 | struct dm_md_mempools *p = dm_table_get_md_mempools(t); |
2a2a4c51 | 1742 | int ret = 0; |
e6ee8c0b | 1743 | |
0776aa0e | 1744 | if (dm_table_bio_based(t)) { |
64f52b0e MS |
1745 | /* |
1746 | * The md may already have mempools that need changing. | |
1747 | * If so, reload bioset because front_pad may have changed | |
1748 | * because a different table was loaded. | |
1749 | */ | |
6f1c819c KO |
1750 | bioset_exit(&md->bs); |
1751 | bioset_exit(&md->io_bs); | |
0776aa0e | 1752 | |
6f1c819c | 1753 | } else if (bioset_initialized(&md->bs)) { |
4e6e36c3 MS |
1754 | /* |
1755 | * There's no need to reload with request-based dm | |
1756 | * because the size of front_pad doesn't change. | |
1757 | * Note for future: If you are to reload bioset, | |
1758 | * prep-ed requests in the queue may refer | |
1759 | * to bio from the old bioset, so you must walk | |
1760 | * through the queue to unprep. | |
1761 | */ | |
1762 | goto out; | |
c0820cf5 | 1763 | } |
e6ee8c0b | 1764 | |
6f1c819c KO |
1765 | BUG_ON(!p || |
1766 | bioset_initialized(&md->bs) || | |
1767 | bioset_initialized(&md->io_bs)); | |
cbc4e3c1 | 1768 | |
2a2a4c51 JA |
1769 | ret = bioset_init_from_src(&md->bs, &p->bs); |
1770 | if (ret) | |
1771 | goto out; | |
1772 | ret = bioset_init_from_src(&md->io_bs, &p->io_bs); | |
1773 | if (ret) | |
1774 | bioset_exit(&md->bs); | |
e6ee8c0b | 1775 | out: |
02233342 | 1776 | /* mempool bind completed, no longer need any mempools in the table */ |
e6ee8c0b | 1777 | dm_table_free_md_mempools(t); |
2a2a4c51 | 1778 | return ret; |
e6ee8c0b KU |
1779 | } |
1780 | ||
1da177e4 LT |
1781 | /* |
1782 | * Bind a table to the device. | |
1783 | */ | |
1784 | static void event_callback(void *context) | |
1785 | { | |
7a8c3d3b MA |
1786 | unsigned long flags; |
1787 | LIST_HEAD(uevents); | |
1da177e4 LT |
1788 | struct mapped_device *md = (struct mapped_device *) context; |
1789 | ||
7a8c3d3b MA |
1790 | spin_lock_irqsave(&md->uevent_lock, flags); |
1791 | list_splice_init(&md->uevent_list, &uevents); | |
1792 | spin_unlock_irqrestore(&md->uevent_lock, flags); | |
1793 | ||
ed9e1982 | 1794 | dm_send_uevents(&uevents, &disk_to_dev(md->disk)->kobj); |
7a8c3d3b | 1795 | |
1da177e4 LT |
1796 | atomic_inc(&md->event_nr); |
1797 | wake_up(&md->eventq); | |
62e08243 | 1798 | dm_issue_global_event(); |
1da177e4 LT |
1799 | } |
1800 | ||
042d2a9b AK |
1801 | /* |
1802 | * Returns old map, which caller must destroy. | |
1803 | */ | |
1804 | static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, | |
1805 | struct queue_limits *limits) | |
1da177e4 | 1806 | { |
042d2a9b | 1807 | struct dm_table *old_map; |
165125e1 | 1808 | struct request_queue *q = md->queue; |
978e51ba | 1809 | bool request_based = dm_table_request_based(t); |
1da177e4 | 1810 | sector_t size; |
2a2a4c51 | 1811 | int ret; |
1da177e4 | 1812 | |
5a8f1f80 BVA |
1813 | lockdep_assert_held(&md->suspend_lock); |
1814 | ||
1da177e4 | 1815 | size = dm_table_get_size(t); |
3ac51e74 DW |
1816 | |
1817 | /* | |
1818 | * Wipe any geometry if the size of the table changed. | |
1819 | */ | |
fd2ed4d2 | 1820 | if (size != dm_get_size(md)) |
3ac51e74 DW |
1821 | memset(&md->geometry, 0, sizeof(md->geometry)); |
1822 | ||
5424a0b8 MP |
1823 | if (!get_capacity(md->disk)) |
1824 | set_capacity(md->disk, size); | |
1825 | else | |
1826 | set_capacity_and_notify(md->disk, size); | |
d5816876 | 1827 | |
2ca3310e AK |
1828 | dm_table_event_callback(t, event_callback, md); |
1829 | ||
9c37de29 | 1830 | if (request_based) { |
16f12266 | 1831 | /* |
9c37de29 MS |
1832 | * Leverage the fact that request-based DM targets are |
1833 | * immutable singletons - used to optimize dm_mq_queue_rq. | |
16f12266 MS |
1834 | */ |
1835 | md->immutable_target = dm_table_get_immutable_target(t); | |
1836 | } | |
e6ee8c0b | 1837 | |
2a2a4c51 JA |
1838 | ret = __bind_mempools(md, t); |
1839 | if (ret) { | |
1840 | old_map = ERR_PTR(ret); | |
1841 | goto out; | |
1842 | } | |
e6ee8c0b | 1843 | |
bb37d772 DLM |
1844 | ret = dm_table_set_restrictions(t, q, limits); |
1845 | if (ret) { | |
1846 | old_map = ERR_PTR(ret); | |
1847 | goto out; | |
1848 | } | |
1849 | ||
a12f5d48 | 1850 | old_map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
1d3aa6f6 | 1851 | rcu_assign_pointer(md->map, (void *)t); |
36a0456f AK |
1852 | md->immutable_target_type = dm_table_get_immutable_target_type(t); |
1853 | ||
41abc4e1 HR |
1854 | if (old_map) |
1855 | dm_sync_table(md); | |
1da177e4 | 1856 | |
2a2a4c51 | 1857 | out: |
042d2a9b | 1858 | return old_map; |
1da177e4 LT |
1859 | } |
1860 | ||
a7940155 AK |
1861 | /* |
1862 | * Returns unbound table for the caller to free. | |
1863 | */ | |
1864 | static struct dm_table *__unbind(struct mapped_device *md) | |
1da177e4 | 1865 | { |
a12f5d48 | 1866 | struct dm_table *map = rcu_dereference_protected(md->map, 1); |
1da177e4 LT |
1867 | |
1868 | if (!map) | |
a7940155 | 1869 | return NULL; |
1da177e4 LT |
1870 | |
1871 | dm_table_event_callback(map, NULL, NULL); | |
9cdb8520 | 1872 | RCU_INIT_POINTER(md->map, NULL); |
83d5e5b0 | 1873 | dm_sync_table(md); |
a7940155 AK |
1874 | |
1875 | return map; | |
1da177e4 LT |
1876 | } |
1877 | ||
1878 | /* | |
1879 | * Constructor for a new device. | |
1880 | */ | |
2b06cfff | 1881 | int dm_create(int minor, struct mapped_device **result) |
1da177e4 LT |
1882 | { |
1883 | struct mapped_device *md; | |
1884 | ||
2b06cfff | 1885 | md = alloc_dev(minor); |
1da177e4 LT |
1886 | if (!md) |
1887 | return -ENXIO; | |
1888 | ||
91ccbbac TS |
1889 | dm_ima_reset_data(md); |
1890 | ||
1da177e4 LT |
1891 | *result = md; |
1892 | return 0; | |
1893 | } | |
1894 | ||
a5664dad MS |
1895 | /* |
1896 | * Functions to manage md->type. | |
1897 | * All are required to hold md->type_lock. | |
1898 | */ | |
1899 | void dm_lock_md_type(struct mapped_device *md) | |
1900 | { | |
1901 | mutex_lock(&md->type_lock); | |
1902 | } | |
1903 | ||
1904 | void dm_unlock_md_type(struct mapped_device *md) | |
1905 | { | |
1906 | mutex_unlock(&md->type_lock); | |
1907 | } | |
1908 | ||
7e0d574f | 1909 | void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type) |
a5664dad | 1910 | { |
00c4fc3b | 1911 | BUG_ON(!mutex_is_locked(&md->type_lock)); |
a5664dad MS |
1912 | md->type = type; |
1913 | } | |
1914 | ||
7e0d574f | 1915 | enum dm_queue_mode dm_get_md_type(struct mapped_device *md) |
a5664dad MS |
1916 | { |
1917 | return md->type; | |
1918 | } | |
1919 | ||
36a0456f AK |
1920 | struct target_type *dm_get_immutable_target_type(struct mapped_device *md) |
1921 | { | |
1922 | return md->immutable_target_type; | |
1923 | } | |
1924 | ||
f84cb8a4 MS |
1925 | /* |
1926 | * The queue_limits are only valid as long as you have a reference | |
1927 | * count on 'md'. | |
1928 | */ | |
1929 | struct queue_limits *dm_get_queue_limits(struct mapped_device *md) | |
1930 | { | |
1931 | BUG_ON(!atomic_read(&md->holders)); | |
1932 | return &md->queue->limits; | |
1933 | } | |
1934 | EXPORT_SYMBOL_GPL(dm_get_queue_limits); | |
1935 | ||
4a0b4ddf MS |
1936 | /* |
1937 | * Setup the DM device's queue based on md's type | |
1938 | */ | |
591ddcfc | 1939 | int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t) |
4a0b4ddf | 1940 | { |
ba305859 | 1941 | enum dm_queue_mode type = dm_table_get_type(t); |
c100ec49 | 1942 | struct queue_limits limits; |
ba305859 | 1943 | int r; |
bfebd1cd | 1944 | |
545ed20e | 1945 | switch (type) { |
bfebd1cd | 1946 | case DM_TYPE_REQUEST_BASED: |
681cc5e8 | 1947 | md->disk->fops = &dm_rq_blk_dops; |
e83068a5 | 1948 | r = dm_mq_init_request_queue(md, t); |
bfebd1cd | 1949 | if (r) { |
681cc5e8 | 1950 | DMERR("Cannot initialize queue for request-based dm mapped device"); |
bfebd1cd MS |
1951 | return r; |
1952 | } | |
1953 | break; | |
1954 | case DM_TYPE_BIO_BASED: | |
545ed20e | 1955 | case DM_TYPE_DAX_BIO_BASED: |
bfebd1cd | 1956 | break; |
7e0d574f BVA |
1957 | case DM_TYPE_NONE: |
1958 | WARN_ON_ONCE(true); | |
1959 | break; | |
4a0b4ddf MS |
1960 | } |
1961 | ||
c100ec49 MS |
1962 | r = dm_calculate_queue_limits(t, &limits); |
1963 | if (r) { | |
1964 | DMERR("Cannot calculate initial queue limits"); | |
1965 | return r; | |
1966 | } | |
bb37d772 DLM |
1967 | r = dm_table_set_restrictions(t, md->queue, &limits); |
1968 | if (r) | |
1969 | return r; | |
1970 | ||
e7089f65 LC |
1971 | r = add_disk(md->disk); |
1972 | if (r) | |
1973 | return r; | |
c100ec49 | 1974 | |
89f871af CH |
1975 | r = dm_sysfs_init(md); |
1976 | if (r) { | |
1977 | del_gendisk(md->disk); | |
1978 | return r; | |
1979 | } | |
1980 | md->type = type; | |
4a0b4ddf MS |
1981 | return 0; |
1982 | } | |
1983 | ||
2bec1f4a | 1984 | struct mapped_device *dm_get_md(dev_t dev) |
1da177e4 LT |
1985 | { |
1986 | struct mapped_device *md; | |
1da177e4 LT |
1987 | unsigned minor = MINOR(dev); |
1988 | ||
1989 | if (MAJOR(dev) != _major || minor >= (1 << MINORBITS)) | |
1990 | return NULL; | |
1991 | ||
f32c10b0 | 1992 | spin_lock(&_minor_lock); |
1da177e4 LT |
1993 | |
1994 | md = idr_find(&_minor_idr, minor); | |
49de5769 MS |
1995 | if (!md || md == MINOR_ALLOCED || (MINOR(disk_devt(dm_disk(md))) != minor) || |
1996 | test_bit(DMF_FREEING, &md->flags) || dm_deleting_md(md)) { | |
1997 | md = NULL; | |
1998 | goto out; | |
fba9f90e | 1999 | } |
49de5769 | 2000 | dm_get(md); |
fba9f90e | 2001 | out: |
f32c10b0 | 2002 | spin_unlock(&_minor_lock); |
1da177e4 | 2003 | |
637842cf DT |
2004 | return md; |
2005 | } | |
3cf2e4ba | 2006 | EXPORT_SYMBOL_GPL(dm_get_md); |
d229a958 | 2007 | |
9ade92a9 | 2008 | void *dm_get_mdptr(struct mapped_device *md) |
637842cf | 2009 | { |
9ade92a9 | 2010 | return md->interface_ptr; |
1da177e4 LT |
2011 | } |
2012 | ||
2013 | void dm_set_mdptr(struct mapped_device *md, void *ptr) | |
2014 | { | |
2015 | md->interface_ptr = ptr; | |
2016 | } | |
2017 | ||
2018 | void dm_get(struct mapped_device *md) | |
2019 | { | |
2020 | atomic_inc(&md->holders); | |
3f77316d | 2021 | BUG_ON(test_bit(DMF_FREEING, &md->flags)); |
1da177e4 LT |
2022 | } |
2023 | ||
09ee96b2 MP |
2024 | int dm_hold(struct mapped_device *md) |
2025 | { | |
2026 | spin_lock(&_minor_lock); | |
2027 | if (test_bit(DMF_FREEING, &md->flags)) { | |
2028 | spin_unlock(&_minor_lock); | |
2029 | return -EBUSY; | |
2030 | } | |
2031 | dm_get(md); | |
2032 | spin_unlock(&_minor_lock); | |
2033 | return 0; | |
2034 | } | |
2035 | EXPORT_SYMBOL_GPL(dm_hold); | |
2036 | ||
72d94861 AK |
2037 | const char *dm_device_name(struct mapped_device *md) |
2038 | { | |
2039 | return md->name; | |
2040 | } | |
2041 | EXPORT_SYMBOL_GPL(dm_device_name); | |
2042 | ||
3f77316d | 2043 | static void __dm_destroy(struct mapped_device *md, bool wait) |
1da177e4 | 2044 | { |
1134e5ae | 2045 | struct dm_table *map; |
83d5e5b0 | 2046 | int srcu_idx; |
1da177e4 | 2047 | |
3f77316d | 2048 | might_sleep(); |
fba9f90e | 2049 | |
63a4f065 | 2050 | spin_lock(&_minor_lock); |
3f77316d KU |
2051 | idr_replace(&_minor_idr, MINOR_ALLOCED, MINOR(disk_devt(dm_disk(md)))); |
2052 | set_bit(DMF_FREEING, &md->flags); | |
2053 | spin_unlock(&_minor_lock); | |
3b785fbc | 2054 | |
c12c9a3c | 2055 | blk_set_queue_dying(md->queue); |
3f77316d | 2056 | |
ab7c7bb6 MP |
2057 | /* |
2058 | * Take suspend_lock so that presuspend and postsuspend methods | |
2059 | * do not race with internal suspend. | |
2060 | */ | |
2061 | mutex_lock(&md->suspend_lock); | |
2a708cff | 2062 | map = dm_get_live_table(md, &srcu_idx); |
3f77316d KU |
2063 | if (!dm_suspended_md(md)) { |
2064 | dm_table_presuspend_targets(map); | |
adc0daad | 2065 | set_bit(DMF_SUSPENDED, &md->flags); |
5df96f2b | 2066 | set_bit(DMF_POST_SUSPENDING, &md->flags); |
3f77316d | 2067 | dm_table_postsuspend_targets(map); |
1da177e4 | 2068 | } |
83d5e5b0 MP |
2069 | /* dm_put_live_table must be before msleep, otherwise deadlock is possible */ |
2070 | dm_put_live_table(md, srcu_idx); | |
2a708cff | 2071 | mutex_unlock(&md->suspend_lock); |
83d5e5b0 | 2072 | |
3f77316d KU |
2073 | /* |
2074 | * Rare, but there may be I/O requests still going to complete, | |
2075 | * for example. Wait for all references to disappear. | |
2076 | * No one should increment the reference count of the mapped_device, | |
2077 | * after the mapped_device state becomes DMF_FREEING. | |
2078 | */ | |
2079 | if (wait) | |
2080 | while (atomic_read(&md->holders)) | |
2081 | msleep(1); | |
2082 | else if (atomic_read(&md->holders)) | |
2083 | DMWARN("%s: Forcibly removing mapped_device still in use! (%d users)", | |
2084 | dm_device_name(md), atomic_read(&md->holders)); | |
2085 | ||
3f77316d KU |
2086 | dm_table_destroy(__unbind(md)); |
2087 | free_dev(md); | |
2088 | } | |
2089 | ||
2090 | void dm_destroy(struct mapped_device *md) | |
2091 | { | |
2092 | __dm_destroy(md, true); | |
2093 | } | |
2094 | ||
2095 | void dm_destroy_immediate(struct mapped_device *md) | |
2096 | { | |
2097 | __dm_destroy(md, false); | |
2098 | } | |
2099 | ||
2100 | void dm_put(struct mapped_device *md) | |
2101 | { | |
2102 | atomic_dec(&md->holders); | |
1da177e4 | 2103 | } |
79eb885c | 2104 | EXPORT_SYMBOL_GPL(dm_put); |
1da177e4 | 2105 | |
85067747 ML |
2106 | static bool md_in_flight_bios(struct mapped_device *md) |
2107 | { | |
2108 | int cpu; | |
8446fe92 | 2109 | struct block_device *part = dm_disk(md)->part0; |
85067747 ML |
2110 | long sum = 0; |
2111 | ||
2112 | for_each_possible_cpu(cpu) { | |
2113 | sum += part_stat_local_read_cpu(part, in_flight[0], cpu); | |
2114 | sum += part_stat_local_read_cpu(part, in_flight[1], cpu); | |
2115 | } | |
2116 | ||
2117 | return sum != 0; | |
2118 | } | |
2119 | ||
2f064a59 | 2120 | static int dm_wait_for_bios_completion(struct mapped_device *md, unsigned int task_state) |
46125c1c MB |
2121 | { |
2122 | int r = 0; | |
9f4c3f87 | 2123 | DEFINE_WAIT(wait); |
46125c1c | 2124 | |
85067747 | 2125 | while (true) { |
9f4c3f87 | 2126 | prepare_to_wait(&md->wait, &wait, task_state); |
46125c1c | 2127 | |
85067747 | 2128 | if (!md_in_flight_bios(md)) |
46125c1c MB |
2129 | break; |
2130 | ||
e3fabdfd | 2131 | if (signal_pending_state(task_state, current)) { |
46125c1c MB |
2132 | r = -EINTR; |
2133 | break; | |
2134 | } | |
2135 | ||
2136 | io_schedule(); | |
2137 | } | |
9f4c3f87 | 2138 | finish_wait(&md->wait, &wait); |
b44ebeb0 | 2139 | |
46125c1c MB |
2140 | return r; |
2141 | } | |
2142 | ||
2f064a59 | 2143 | static int dm_wait_for_completion(struct mapped_device *md, unsigned int task_state) |
85067747 ML |
2144 | { |
2145 | int r = 0; | |
2146 | ||
2147 | if (!queue_is_mq(md->queue)) | |
2148 | return dm_wait_for_bios_completion(md, task_state); | |
2149 | ||
2150 | while (true) { | |
2151 | if (!blk_mq_queue_inflight(md->queue)) | |
2152 | break; | |
2153 | ||
2154 | if (signal_pending_state(task_state, current)) { | |
2155 | r = -EINTR; | |
2156 | break; | |
2157 | } | |
2158 | ||
2159 | msleep(5); | |
2160 | } | |
2161 | ||
2162 | return r; | |
2163 | } | |
2164 | ||
1da177e4 LT |
2165 | /* |
2166 | * Process the deferred bios | |
2167 | */ | |
ef208587 | 2168 | static void dm_wq_work(struct work_struct *work) |
1da177e4 | 2169 | { |
0c2915b8 MS |
2170 | struct mapped_device *md = container_of(work, struct mapped_device, work); |
2171 | struct bio *bio; | |
ef208587 | 2172 | |
3b00b203 | 2173 | while (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) { |
df12ee99 | 2174 | spin_lock_irq(&md->deferred_lock); |
0c2915b8 | 2175 | bio = bio_list_pop(&md->deferred); |
df12ee99 AK |
2176 | spin_unlock_irq(&md->deferred_lock); |
2177 | ||
0c2915b8 | 2178 | if (!bio) |
df12ee99 | 2179 | break; |
022c2611 | 2180 | |
0c2915b8 | 2181 | submit_bio_noacct(bio); |
022c2611 | 2182 | } |
1da177e4 LT |
2183 | } |
2184 | ||
9a1fb464 | 2185 | static void dm_queue_flush(struct mapped_device *md) |
304f3f6a | 2186 | { |
3b00b203 | 2187 | clear_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
4e857c58 | 2188 | smp_mb__after_atomic(); |
53d5914f | 2189 | queue_work(md->wq, &md->work); |
304f3f6a MB |
2190 | } |
2191 | ||
1da177e4 | 2192 | /* |
042d2a9b | 2193 | * Swap in a new table, returning the old one for the caller to destroy. |
1da177e4 | 2194 | */ |
042d2a9b | 2195 | struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table) |
1da177e4 | 2196 | { |
87eb5b21 | 2197 | struct dm_table *live_map = NULL, *map = ERR_PTR(-EINVAL); |
754c5fc7 | 2198 | struct queue_limits limits; |
042d2a9b | 2199 | int r; |
1da177e4 | 2200 | |
e61290a4 | 2201 | mutex_lock(&md->suspend_lock); |
1da177e4 LT |
2202 | |
2203 | /* device must be suspended */ | |
4f186f8b | 2204 | if (!dm_suspended_md(md)) |
93c534ae | 2205 | goto out; |
1da177e4 | 2206 | |
3ae70656 MS |
2207 | /* |
2208 | * If the new table has no data devices, retain the existing limits. | |
2209 | * This helps multipath with queue_if_no_path if all paths disappear, | |
2210 | * then new I/O is queued based on these limits, and then some paths | |
2211 | * reappear. | |
2212 | */ | |
2213 | if (dm_table_has_no_data_devices(table)) { | |
83d5e5b0 | 2214 | live_map = dm_get_live_table_fast(md); |
3ae70656 MS |
2215 | if (live_map) |
2216 | limits = md->queue->limits; | |
83d5e5b0 | 2217 | dm_put_live_table_fast(md); |
3ae70656 MS |
2218 | } |
2219 | ||
87eb5b21 MC |
2220 | if (!live_map) { |
2221 | r = dm_calculate_queue_limits(table, &limits); | |
2222 | if (r) { | |
2223 | map = ERR_PTR(r); | |
2224 | goto out; | |
2225 | } | |
042d2a9b | 2226 | } |
754c5fc7 | 2227 | |
042d2a9b | 2228 | map = __bind(md, table, &limits); |
62e08243 | 2229 | dm_issue_global_event(); |
1da177e4 | 2230 | |
93c534ae | 2231 | out: |
e61290a4 | 2232 | mutex_unlock(&md->suspend_lock); |
042d2a9b | 2233 | return map; |
1da177e4 LT |
2234 | } |
2235 | ||
2236 | /* | |
2237 | * Functions to lock and unlock any filesystem running on the | |
2238 | * device. | |
2239 | */ | |
2ca3310e | 2240 | static int lock_fs(struct mapped_device *md) |
1da177e4 | 2241 | { |
e39e2e95 | 2242 | int r; |
1da177e4 | 2243 | |
040f04bd | 2244 | WARN_ON(test_bit(DMF_FROZEN, &md->flags)); |
aa8d7c2f | 2245 | |
977115c0 | 2246 | r = freeze_bdev(md->disk->part0); |
040f04bd CH |
2247 | if (!r) |
2248 | set_bit(DMF_FROZEN, &md->flags); | |
2249 | return r; | |
1da177e4 LT |
2250 | } |
2251 | ||
2ca3310e | 2252 | static void unlock_fs(struct mapped_device *md) |
1da177e4 | 2253 | { |
aa8d7c2f AK |
2254 | if (!test_bit(DMF_FROZEN, &md->flags)) |
2255 | return; | |
977115c0 | 2256 | thaw_bdev(md->disk->part0); |
aa8d7c2f | 2257 | clear_bit(DMF_FROZEN, &md->flags); |
1da177e4 LT |
2258 | } |
2259 | ||
2260 | /* | |
b48633f8 BVA |
2261 | * @suspend_flags: DM_SUSPEND_LOCKFS_FLAG and/or DM_SUSPEND_NOFLUSH_FLAG |
2262 | * @task_state: e.g. TASK_INTERRUPTIBLE or TASK_UNINTERRUPTIBLE | |
2263 | * @dmf_suspended_flag: DMF_SUSPENDED or DMF_SUSPENDED_INTERNALLY | |
2264 | * | |
ffcc3936 MS |
2265 | * If __dm_suspend returns 0, the device is completely quiescent |
2266 | * now. There is no request-processing activity. All new requests | |
2267 | * are being added to md->deferred list. | |
cec47e3d | 2268 | */ |
ffcc3936 | 2269 | static int __dm_suspend(struct mapped_device *md, struct dm_table *map, |
2f064a59 | 2270 | unsigned suspend_flags, unsigned int task_state, |
eaf9a736 | 2271 | int dmf_suspended_flag) |
1da177e4 | 2272 | { |
ffcc3936 MS |
2273 | bool do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG; |
2274 | bool noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG; | |
2275 | int r; | |
1da177e4 | 2276 | |
5a8f1f80 BVA |
2277 | lockdep_assert_held(&md->suspend_lock); |
2278 | ||
2e93ccc1 KU |
2279 | /* |
2280 | * DMF_NOFLUSH_SUSPENDING must be set before presuspend. | |
2281 | * This flag is cleared before dm_suspend returns. | |
2282 | */ | |
2283 | if (noflush) | |
2284 | set_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); | |
86331f39 | 2285 | else |
ac75b09f | 2286 | DMDEBUG("%s: suspending with flush", dm_device_name(md)); |
2e93ccc1 | 2287 | |
d67ee213 MS |
2288 | /* |
2289 | * This gets reverted if there's an error later and the targets | |
2290 | * provide the .presuspend_undo hook. | |
2291 | */ | |
cf222b37 AK |
2292 | dm_table_presuspend_targets(map); |
2293 | ||
32a926da | 2294 | /* |
9f518b27 KU |
2295 | * Flush I/O to the device. |
2296 | * Any I/O submitted after lock_fs() may not be flushed. | |
2297 | * noflush takes precedence over do_lockfs. | |
2298 | * (lock_fs() flushes I/Os and waits for them to complete.) | |
32a926da MP |
2299 | */ |
2300 | if (!noflush && do_lockfs) { | |
2301 | r = lock_fs(md); | |
d67ee213 MS |
2302 | if (r) { |
2303 | dm_table_presuspend_undo_targets(map); | |
ffcc3936 | 2304 | return r; |
d67ee213 | 2305 | } |
aa8d7c2f | 2306 | } |
1da177e4 LT |
2307 | |
2308 | /* | |
3b00b203 MP |
2309 | * Here we must make sure that no processes are submitting requests |
2310 | * to target drivers i.e. no one may be executing | |
0cede372 | 2311 | * __split_and_process_bio from dm_submit_bio. |
3b00b203 | 2312 | * |
0cede372 | 2313 | * To get all processes out of __split_and_process_bio in dm_submit_bio, |
3b00b203 | 2314 | * we take the write lock. To prevent any process from reentering |
0cede372 MS |
2315 | * __split_and_process_bio from dm_submit_bio and quiesce the thread |
2316 | * (dm_wq_work), we set DMF_BLOCK_IO_FOR_SUSPEND and call | |
6a8736d1 | 2317 | * flush_workqueue(md->wq). |
1da177e4 | 2318 | */ |
1eb787ec | 2319 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
41abc4e1 HR |
2320 | if (map) |
2321 | synchronize_srcu(&md->io_barrier); | |
1da177e4 | 2322 | |
d0bcb878 | 2323 | /* |
29e4013d TH |
2324 | * Stop md->queue before flushing md->wq in case request-based |
2325 | * dm defers requests to md->wq from md->queue. | |
d0bcb878 | 2326 | */ |
6a23e05c | 2327 | if (dm_request_based(md)) |
eca7ee6d | 2328 | dm_stop_queue(md->queue); |
cec47e3d | 2329 | |
d0bcb878 KU |
2330 | flush_workqueue(md->wq); |
2331 | ||
1da177e4 | 2332 | /* |
3b00b203 MP |
2333 | * At this point no more requests are entering target request routines. |
2334 | * We call dm_wait_for_completion to wait for all existing requests | |
2335 | * to finish. | |
1da177e4 | 2336 | */ |
b48633f8 | 2337 | r = dm_wait_for_completion(md, task_state); |
eaf9a736 MS |
2338 | if (!r) |
2339 | set_bit(dmf_suspended_flag, &md->flags); | |
1da177e4 | 2340 | |
6d6f10df | 2341 | if (noflush) |
022c2611 | 2342 | clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); |
41abc4e1 HR |
2343 | if (map) |
2344 | synchronize_srcu(&md->io_barrier); | |
2e93ccc1 | 2345 | |
1da177e4 | 2346 | /* were we interrupted ? */ |
46125c1c | 2347 | if (r < 0) { |
9a1fb464 | 2348 | dm_queue_flush(md); |
73d410c0 | 2349 | |
cec47e3d | 2350 | if (dm_request_based(md)) |
eca7ee6d | 2351 | dm_start_queue(md->queue); |
cec47e3d | 2352 | |
2ca3310e | 2353 | unlock_fs(md); |
d67ee213 | 2354 | dm_table_presuspend_undo_targets(map); |
ffcc3936 | 2355 | /* pushback list is already flushed, so skip flush */ |
2ca3310e | 2356 | } |
1da177e4 | 2357 | |
ffcc3936 MS |
2358 | return r; |
2359 | } | |
2360 | ||
2361 | /* | |
2362 | * We need to be able to change a mapping table under a mounted | |
2363 | * filesystem. For example we might want to move some data in | |
2364 | * the background. Before the table can be swapped with | |
2365 | * dm_bind_table, dm_suspend must be called to flush any in | |
2366 | * flight bios and ensure that any further io gets deferred. | |
2367 | */ | |
2368 | /* | |
2369 | * Suspend mechanism in request-based dm. | |
2370 | * | |
2371 | * 1. Flush all I/Os by lock_fs() if needed. | |
2372 | * 2. Stop dispatching any I/O by stopping the request_queue. | |
2373 | * 3. Wait for all in-flight I/Os to be completed or requeued. | |
2374 | * | |
2375 | * To abort suspend, start the request_queue. | |
2376 | */ | |
2377 | int dm_suspend(struct mapped_device *md, unsigned suspend_flags) | |
2378 | { | |
2379 | struct dm_table *map = NULL; | |
2380 | int r = 0; | |
2381 | ||
2382 | retry: | |
2383 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); | |
2384 | ||
2385 | if (dm_suspended_md(md)) { | |
2386 | r = -EINVAL; | |
2387 | goto out_unlock; | |
2388 | } | |
2389 | ||
2390 | if (dm_suspended_internally_md(md)) { | |
2391 | /* already internally suspended, wait for internal resume */ | |
2392 | mutex_unlock(&md->suspend_lock); | |
2393 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); | |
2394 | if (r) | |
2395 | return r; | |
2396 | goto retry; | |
2397 | } | |
2398 | ||
a12f5d48 | 2399 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
ffcc3936 | 2400 | |
eaf9a736 | 2401 | r = __dm_suspend(md, map, suspend_flags, TASK_INTERRUPTIBLE, DMF_SUSPENDED); |
ffcc3936 MS |
2402 | if (r) |
2403 | goto out_unlock; | |
3b00b203 | 2404 | |
5df96f2b | 2405 | set_bit(DMF_POST_SUSPENDING, &md->flags); |
4d4471cb | 2406 | dm_table_postsuspend_targets(map); |
5df96f2b | 2407 | clear_bit(DMF_POST_SUSPENDING, &md->flags); |
4d4471cb | 2408 | |
d287483d | 2409 | out_unlock: |
e61290a4 | 2410 | mutex_unlock(&md->suspend_lock); |
cf222b37 | 2411 | return r; |
1da177e4 LT |
2412 | } |
2413 | ||
ffcc3936 MS |
2414 | static int __dm_resume(struct mapped_device *md, struct dm_table *map) |
2415 | { | |
2416 | if (map) { | |
2417 | int r = dm_table_resume_targets(map); | |
2418 | if (r) | |
2419 | return r; | |
2420 | } | |
2421 | ||
2422 | dm_queue_flush(md); | |
2423 | ||
2424 | /* | |
2425 | * Flushing deferred I/Os must be done after targets are resumed | |
2426 | * so that mapping of targets can work correctly. | |
2427 | * Request-based dm is queueing the deferred I/Os in its request_queue. | |
2428 | */ | |
2429 | if (dm_request_based(md)) | |
eca7ee6d | 2430 | dm_start_queue(md->queue); |
ffcc3936 MS |
2431 | |
2432 | unlock_fs(md); | |
2433 | ||
2434 | return 0; | |
2435 | } | |
2436 | ||
1da177e4 LT |
2437 | int dm_resume(struct mapped_device *md) |
2438 | { | |
8dc23658 | 2439 | int r; |
cf222b37 | 2440 | struct dm_table *map = NULL; |
1da177e4 | 2441 | |
ffcc3936 | 2442 | retry: |
8dc23658 | 2443 | r = -EINVAL; |
ffcc3936 MS |
2444 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); |
2445 | ||
4f186f8b | 2446 | if (!dm_suspended_md(md)) |
cf222b37 | 2447 | goto out; |
cf222b37 | 2448 | |
ffcc3936 MS |
2449 | if (dm_suspended_internally_md(md)) { |
2450 | /* already internally suspended, wait for internal resume */ | |
2451 | mutex_unlock(&md->suspend_lock); | |
2452 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); | |
2453 | if (r) | |
2454 | return r; | |
2455 | goto retry; | |
2456 | } | |
2457 | ||
a12f5d48 | 2458 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
2ca3310e | 2459 | if (!map || !dm_table_get_size(map)) |
cf222b37 | 2460 | goto out; |
1da177e4 | 2461 | |
ffcc3936 | 2462 | r = __dm_resume(md, map); |
8757b776 MB |
2463 | if (r) |
2464 | goto out; | |
2ca3310e | 2465 | |
2ca3310e | 2466 | clear_bit(DMF_SUSPENDED, &md->flags); |
cf222b37 | 2467 | out: |
e61290a4 | 2468 | mutex_unlock(&md->suspend_lock); |
2ca3310e | 2469 | |
cf222b37 | 2470 | return r; |
1da177e4 LT |
2471 | } |
2472 | ||
fd2ed4d2 MP |
2473 | /* |
2474 | * Internal suspend/resume works like userspace-driven suspend. It waits | |
2475 | * until all bios finish and prevents issuing new bios to the target drivers. | |
2476 | * It may be used only from the kernel. | |
fd2ed4d2 MP |
2477 | */ |
2478 | ||
ffcc3936 | 2479 | static void __dm_internal_suspend(struct mapped_device *md, unsigned suspend_flags) |
fd2ed4d2 | 2480 | { |
ffcc3936 MS |
2481 | struct dm_table *map = NULL; |
2482 | ||
1ea0654e BVA |
2483 | lockdep_assert_held(&md->suspend_lock); |
2484 | ||
96b26c8c | 2485 | if (md->internal_suspend_count++) |
ffcc3936 MS |
2486 | return; /* nested internal suspend */ |
2487 | ||
2488 | if (dm_suspended_md(md)) { | |
2489 | set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2490 | return; /* nest suspend */ | |
2491 | } | |
2492 | ||
a12f5d48 | 2493 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
ffcc3936 MS |
2494 | |
2495 | /* | |
2496 | * Using TASK_UNINTERRUPTIBLE because only NOFLUSH internal suspend is | |
2497 | * supported. Properly supporting a TASK_INTERRUPTIBLE internal suspend | |
2498 | * would require changing .presuspend to return an error -- avoid this | |
2499 | * until there is a need for more elaborate variants of internal suspend. | |
2500 | */ | |
eaf9a736 MS |
2501 | (void) __dm_suspend(md, map, suspend_flags, TASK_UNINTERRUPTIBLE, |
2502 | DMF_SUSPENDED_INTERNALLY); | |
ffcc3936 | 2503 | |
5df96f2b | 2504 | set_bit(DMF_POST_SUSPENDING, &md->flags); |
ffcc3936 | 2505 | dm_table_postsuspend_targets(map); |
5df96f2b | 2506 | clear_bit(DMF_POST_SUSPENDING, &md->flags); |
ffcc3936 MS |
2507 | } |
2508 | ||
2509 | static void __dm_internal_resume(struct mapped_device *md) | |
2510 | { | |
96b26c8c MP |
2511 | BUG_ON(!md->internal_suspend_count); |
2512 | ||
2513 | if (--md->internal_suspend_count) | |
ffcc3936 MS |
2514 | return; /* resume from nested internal suspend */ |
2515 | ||
fd2ed4d2 | 2516 | if (dm_suspended_md(md)) |
ffcc3936 MS |
2517 | goto done; /* resume from nested suspend */ |
2518 | ||
2519 | /* | |
2520 | * NOTE: existing callers don't need to call dm_table_resume_targets | |
2521 | * (which may fail -- so best to avoid it for now by passing NULL map) | |
2522 | */ | |
2523 | (void) __dm_resume(md, NULL); | |
2524 | ||
2525 | done: | |
2526 | clear_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2527 | smp_mb__after_atomic(); | |
2528 | wake_up_bit(&md->flags, DMF_SUSPENDED_INTERNALLY); | |
2529 | } | |
2530 | ||
2531 | void dm_internal_suspend_noflush(struct mapped_device *md) | |
2532 | { | |
2533 | mutex_lock(&md->suspend_lock); | |
2534 | __dm_internal_suspend(md, DM_SUSPEND_NOFLUSH_FLAG); | |
2535 | mutex_unlock(&md->suspend_lock); | |
2536 | } | |
2537 | EXPORT_SYMBOL_GPL(dm_internal_suspend_noflush); | |
2538 | ||
2539 | void dm_internal_resume(struct mapped_device *md) | |
2540 | { | |
2541 | mutex_lock(&md->suspend_lock); | |
2542 | __dm_internal_resume(md); | |
2543 | mutex_unlock(&md->suspend_lock); | |
2544 | } | |
2545 | EXPORT_SYMBOL_GPL(dm_internal_resume); | |
2546 | ||
2547 | /* | |
2548 | * Fast variants of internal suspend/resume hold md->suspend_lock, | |
2549 | * which prevents interaction with userspace-driven suspend. | |
2550 | */ | |
2551 | ||
2552 | void dm_internal_suspend_fast(struct mapped_device *md) | |
2553 | { | |
2554 | mutex_lock(&md->suspend_lock); | |
2555 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) | |
fd2ed4d2 MP |
2556 | return; |
2557 | ||
2558 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); | |
2559 | synchronize_srcu(&md->io_barrier); | |
2560 | flush_workqueue(md->wq); | |
2561 | dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE); | |
2562 | } | |
b735fede | 2563 | EXPORT_SYMBOL_GPL(dm_internal_suspend_fast); |
fd2ed4d2 | 2564 | |
ffcc3936 | 2565 | void dm_internal_resume_fast(struct mapped_device *md) |
fd2ed4d2 | 2566 | { |
ffcc3936 | 2567 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) |
fd2ed4d2 MP |
2568 | goto done; |
2569 | ||
2570 | dm_queue_flush(md); | |
2571 | ||
2572 | done: | |
2573 | mutex_unlock(&md->suspend_lock); | |
2574 | } | |
b735fede | 2575 | EXPORT_SYMBOL_GPL(dm_internal_resume_fast); |
fd2ed4d2 | 2576 | |
1da177e4 LT |
2577 | /*----------------------------------------------------------------- |
2578 | * Event notification. | |
2579 | *---------------------------------------------------------------*/ | |
3abf85b5 | 2580 | int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, |
60935eb2 | 2581 | unsigned cookie) |
69267a30 | 2582 | { |
6958c1c6 MP |
2583 | int r; |
2584 | unsigned noio_flag; | |
60935eb2 MB |
2585 | char udev_cookie[DM_COOKIE_LENGTH]; |
2586 | char *envp[] = { udev_cookie, NULL }; | |
2587 | ||
6958c1c6 MP |
2588 | noio_flag = memalloc_noio_save(); |
2589 | ||
60935eb2 | 2590 | if (!cookie) |
6958c1c6 | 2591 | r = kobject_uevent(&disk_to_dev(md->disk)->kobj, action); |
60935eb2 MB |
2592 | else { |
2593 | snprintf(udev_cookie, DM_COOKIE_LENGTH, "%s=%u", | |
2594 | DM_COOKIE_ENV_VAR_NAME, cookie); | |
6958c1c6 MP |
2595 | r = kobject_uevent_env(&disk_to_dev(md->disk)->kobj, |
2596 | action, envp); | |
60935eb2 | 2597 | } |
6958c1c6 MP |
2598 | |
2599 | memalloc_noio_restore(noio_flag); | |
2600 | ||
2601 | return r; | |
69267a30 AK |
2602 | } |
2603 | ||
7a8c3d3b MA |
2604 | uint32_t dm_next_uevent_seq(struct mapped_device *md) |
2605 | { | |
2606 | return atomic_add_return(1, &md->uevent_seq); | |
2607 | } | |
2608 | ||
1da177e4 LT |
2609 | uint32_t dm_get_event_nr(struct mapped_device *md) |
2610 | { | |
2611 | return atomic_read(&md->event_nr); | |
2612 | } | |
2613 | ||
2614 | int dm_wait_event(struct mapped_device *md, int event_nr) | |
2615 | { | |
2616 | return wait_event_interruptible(md->eventq, | |
2617 | (event_nr != atomic_read(&md->event_nr))); | |
2618 | } | |
2619 | ||
7a8c3d3b MA |
2620 | void dm_uevent_add(struct mapped_device *md, struct list_head *elist) |
2621 | { | |
2622 | unsigned long flags; | |
2623 | ||
2624 | spin_lock_irqsave(&md->uevent_lock, flags); | |
2625 | list_add(elist, &md->uevent_list); | |
2626 | spin_unlock_irqrestore(&md->uevent_lock, flags); | |
2627 | } | |
2628 | ||
1da177e4 LT |
2629 | /* |
2630 | * The gendisk is only valid as long as you have a reference | |
2631 | * count on 'md'. | |
2632 | */ | |
2633 | struct gendisk *dm_disk(struct mapped_device *md) | |
2634 | { | |
2635 | return md->disk; | |
2636 | } | |
65ff5b7d | 2637 | EXPORT_SYMBOL_GPL(dm_disk); |
1da177e4 | 2638 | |
784aae73 MB |
2639 | struct kobject *dm_kobject(struct mapped_device *md) |
2640 | { | |
2995fa78 | 2641 | return &md->kobj_holder.kobj; |
784aae73 MB |
2642 | } |
2643 | ||
784aae73 MB |
2644 | struct mapped_device *dm_get_from_kobject(struct kobject *kobj) |
2645 | { | |
2646 | struct mapped_device *md; | |
2647 | ||
2995fa78 | 2648 | md = container_of(kobj, struct mapped_device, kobj_holder.kobj); |
784aae73 | 2649 | |
b9a41d21 HT |
2650 | spin_lock(&_minor_lock); |
2651 | if (test_bit(DMF_FREEING, &md->flags) || dm_deleting_md(md)) { | |
2652 | md = NULL; | |
2653 | goto out; | |
2654 | } | |
784aae73 | 2655 | dm_get(md); |
b9a41d21 HT |
2656 | out: |
2657 | spin_unlock(&_minor_lock); | |
2658 | ||
784aae73 MB |
2659 | return md; |
2660 | } | |
2661 | ||
4f186f8b | 2662 | int dm_suspended_md(struct mapped_device *md) |
1da177e4 LT |
2663 | { |
2664 | return test_bit(DMF_SUSPENDED, &md->flags); | |
2665 | } | |
2666 | ||
5df96f2b MP |
2667 | static int dm_post_suspending_md(struct mapped_device *md) |
2668 | { | |
2669 | return test_bit(DMF_POST_SUSPENDING, &md->flags); | |
2670 | } | |
2671 | ||
ffcc3936 MS |
2672 | int dm_suspended_internally_md(struct mapped_device *md) |
2673 | { | |
2674 | return test_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2675 | } | |
2676 | ||
2c140a24 MP |
2677 | int dm_test_deferred_remove_flag(struct mapped_device *md) |
2678 | { | |
2679 | return test_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
2680 | } | |
2681 | ||
64dbce58 KU |
2682 | int dm_suspended(struct dm_target *ti) |
2683 | { | |
33bd6f06 | 2684 | return dm_suspended_md(ti->table->md); |
64dbce58 KU |
2685 | } |
2686 | EXPORT_SYMBOL_GPL(dm_suspended); | |
2687 | ||
5df96f2b MP |
2688 | int dm_post_suspending(struct dm_target *ti) |
2689 | { | |
33bd6f06 | 2690 | return dm_post_suspending_md(ti->table->md); |
5df96f2b MP |
2691 | } |
2692 | EXPORT_SYMBOL_GPL(dm_post_suspending); | |
2693 | ||
2e93ccc1 KU |
2694 | int dm_noflush_suspending(struct dm_target *ti) |
2695 | { | |
33bd6f06 | 2696 | return __noflush_suspending(ti->table->md); |
2e93ccc1 KU |
2697 | } |
2698 | EXPORT_SYMBOL_GPL(dm_noflush_suspending); | |
2699 | ||
7e0d574f | 2700 | struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type, |
0776aa0e MS |
2701 | unsigned integrity, unsigned per_io_data_size, |
2702 | unsigned min_pool_size) | |
e6ee8c0b | 2703 | { |
115485e8 | 2704 | struct dm_md_mempools *pools = kzalloc_node(sizeof(*pools), GFP_KERNEL, md->numa_node_id); |
78d8e58a | 2705 | unsigned int pool_size = 0; |
64f52b0e | 2706 | unsigned int front_pad, io_front_pad; |
6f1c819c | 2707 | int ret; |
e6ee8c0b KU |
2708 | |
2709 | if (!pools) | |
4e6e36c3 | 2710 | return NULL; |
e6ee8c0b | 2711 | |
78d8e58a MS |
2712 | switch (type) { |
2713 | case DM_TYPE_BIO_BASED: | |
545ed20e | 2714 | case DM_TYPE_DAX_BIO_BASED: |
0776aa0e | 2715 | pool_size = max(dm_get_reserved_bio_based_ios(), min_pool_size); |
62f26317 JX |
2716 | front_pad = roundup(per_io_data_size, __alignof__(struct dm_target_io)) + DM_TARGET_IO_BIO_OFFSET; |
2717 | io_front_pad = roundup(per_io_data_size, __alignof__(struct dm_io)) + DM_IO_BIO_OFFSET; | |
6f1c819c KO |
2718 | ret = bioset_init(&pools->io_bs, pool_size, io_front_pad, 0); |
2719 | if (ret) | |
64f52b0e | 2720 | goto out; |
6f1c819c | 2721 | if (integrity && bioset_integrity_create(&pools->io_bs, pool_size)) |
eb8db831 | 2722 | goto out; |
78d8e58a MS |
2723 | break; |
2724 | case DM_TYPE_REQUEST_BASED: | |
0776aa0e | 2725 | pool_size = max(dm_get_reserved_rq_based_ios(), min_pool_size); |
78d8e58a | 2726 | front_pad = offsetof(struct dm_rq_clone_bio_info, clone); |
591ddcfc | 2727 | /* per_io_data_size is used for blk-mq pdu at queue allocation */ |
78d8e58a MS |
2728 | break; |
2729 | default: | |
2730 | BUG(); | |
2731 | } | |
2732 | ||
6f1c819c KO |
2733 | ret = bioset_init(&pools->bs, pool_size, front_pad, 0); |
2734 | if (ret) | |
5f015204 | 2735 | goto out; |
e6ee8c0b | 2736 | |
6f1c819c | 2737 | if (integrity && bioset_integrity_create(&pools->bs, pool_size)) |
5f015204 | 2738 | goto out; |
a91a2785 | 2739 | |
e6ee8c0b | 2740 | return pools; |
5f1b670d | 2741 | |
5f1b670d CH |
2742 | out: |
2743 | dm_free_md_mempools(pools); | |
78d8e58a | 2744 | |
4e6e36c3 | 2745 | return NULL; |
e6ee8c0b KU |
2746 | } |
2747 | ||
2748 | void dm_free_md_mempools(struct dm_md_mempools *pools) | |
2749 | { | |
2750 | if (!pools) | |
2751 | return; | |
2752 | ||
6f1c819c KO |
2753 | bioset_exit(&pools->bs); |
2754 | bioset_exit(&pools->io_bs); | |
e6ee8c0b KU |
2755 | |
2756 | kfree(pools); | |
2757 | } | |
2758 | ||
9c72bad1 CH |
2759 | struct dm_pr { |
2760 | u64 old_key; | |
2761 | u64 new_key; | |
2762 | u32 flags; | |
2763 | bool fail_early; | |
2764 | }; | |
2765 | ||
2766 | static int dm_call_pr(struct block_device *bdev, iterate_devices_callout_fn fn, | |
2767 | void *data) | |
71cdb697 CH |
2768 | { |
2769 | struct mapped_device *md = bdev->bd_disk->private_data; | |
9c72bad1 CH |
2770 | struct dm_table *table; |
2771 | struct dm_target *ti; | |
2772 | int ret = -ENOTTY, srcu_idx; | |
71cdb697 | 2773 | |
9c72bad1 CH |
2774 | table = dm_get_live_table(md, &srcu_idx); |
2775 | if (!table || !dm_table_get_size(table)) | |
2776 | goto out; | |
71cdb697 | 2777 | |
9c72bad1 CH |
2778 | /* We only support devices that have a single target */ |
2779 | if (dm_table_get_num_targets(table) != 1) | |
2780 | goto out; | |
2781 | ti = dm_table_get_target(table, 0); | |
71cdb697 | 2782 | |
9c72bad1 CH |
2783 | ret = -EINVAL; |
2784 | if (!ti->type->iterate_devices) | |
2785 | goto out; | |
2786 | ||
2787 | ret = ti->type->iterate_devices(ti, fn, data); | |
2788 | out: | |
2789 | dm_put_live_table(md, srcu_idx); | |
2790 | return ret; | |
2791 | } | |
2792 | ||
2793 | /* | |
2794 | * For register / unregister we need to manually call out to every path. | |
2795 | */ | |
2796 | static int __dm_pr_register(struct dm_target *ti, struct dm_dev *dev, | |
2797 | sector_t start, sector_t len, void *data) | |
2798 | { | |
2799 | struct dm_pr *pr = data; | |
2800 | const struct pr_ops *ops = dev->bdev->bd_disk->fops->pr_ops; | |
2801 | ||
2802 | if (!ops || !ops->pr_register) | |
2803 | return -EOPNOTSUPP; | |
2804 | return ops->pr_register(dev->bdev, pr->old_key, pr->new_key, pr->flags); | |
2805 | } | |
2806 | ||
2807 | static int dm_pr_register(struct block_device *bdev, u64 old_key, u64 new_key, | |
2808 | u32 flags) | |
2809 | { | |
2810 | struct dm_pr pr = { | |
2811 | .old_key = old_key, | |
2812 | .new_key = new_key, | |
2813 | .flags = flags, | |
2814 | .fail_early = true, | |
2815 | }; | |
2816 | int ret; | |
2817 | ||
2818 | ret = dm_call_pr(bdev, __dm_pr_register, &pr); | |
2819 | if (ret && new_key) { | |
2820 | /* unregister all paths if we failed to register any path */ | |
2821 | pr.old_key = new_key; | |
2822 | pr.new_key = 0; | |
2823 | pr.flags = 0; | |
2824 | pr.fail_early = false; | |
2825 | dm_call_pr(bdev, __dm_pr_register, &pr); | |
2826 | } | |
2827 | ||
2828 | return ret; | |
71cdb697 CH |
2829 | } |
2830 | ||
2831 | static int dm_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type, | |
956a4025 | 2832 | u32 flags) |
71cdb697 CH |
2833 | { |
2834 | struct mapped_device *md = bdev->bd_disk->private_data; | |
2835 | const struct pr_ops *ops; | |
971888c4 | 2836 | int r, srcu_idx; |
71cdb697 | 2837 | |
5bd5e8d8 | 2838 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
71cdb697 | 2839 | if (r < 0) |
971888c4 | 2840 | goto out; |
71cdb697 CH |
2841 | |
2842 | ops = bdev->bd_disk->fops->pr_ops; | |
2843 | if (ops && ops->pr_reserve) | |
2844 | r = ops->pr_reserve(bdev, key, type, flags); | |
2845 | else | |
2846 | r = -EOPNOTSUPP; | |
971888c4 MS |
2847 | out: |
2848 | dm_unprepare_ioctl(md, srcu_idx); | |
71cdb697 CH |
2849 | return r; |
2850 | } | |
2851 | ||
2852 | static int dm_pr_release(struct block_device *bdev, u64 key, enum pr_type type) | |
2853 | { | |
2854 | struct mapped_device *md = bdev->bd_disk->private_data; | |
2855 | const struct pr_ops *ops; | |
971888c4 | 2856 | int r, srcu_idx; |
71cdb697 | 2857 | |
5bd5e8d8 | 2858 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
71cdb697 | 2859 | if (r < 0) |
971888c4 | 2860 | goto out; |
71cdb697 CH |
2861 | |
2862 | ops = bdev->bd_disk->fops->pr_ops; | |
2863 | if (ops && ops->pr_release) | |
2864 | r = ops->pr_release(bdev, key, type); | |
2865 | else | |
2866 | r = -EOPNOTSUPP; | |
971888c4 MS |
2867 | out: |
2868 | dm_unprepare_ioctl(md, srcu_idx); | |
71cdb697 CH |
2869 | return r; |
2870 | } | |
2871 | ||
2872 | static int dm_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key, | |
956a4025 | 2873 | enum pr_type type, bool abort) |
71cdb697 CH |
2874 | { |
2875 | struct mapped_device *md = bdev->bd_disk->private_data; | |
2876 | const struct pr_ops *ops; | |
971888c4 | 2877 | int r, srcu_idx; |
71cdb697 | 2878 | |
5bd5e8d8 | 2879 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
71cdb697 | 2880 | if (r < 0) |
971888c4 | 2881 | goto out; |
71cdb697 CH |
2882 | |
2883 | ops = bdev->bd_disk->fops->pr_ops; | |
2884 | if (ops && ops->pr_preempt) | |
2885 | r = ops->pr_preempt(bdev, old_key, new_key, type, abort); | |
2886 | else | |
2887 | r = -EOPNOTSUPP; | |
971888c4 MS |
2888 | out: |
2889 | dm_unprepare_ioctl(md, srcu_idx); | |
71cdb697 CH |
2890 | return r; |
2891 | } | |
2892 | ||
2893 | static int dm_pr_clear(struct block_device *bdev, u64 key) | |
2894 | { | |
2895 | struct mapped_device *md = bdev->bd_disk->private_data; | |
2896 | const struct pr_ops *ops; | |
971888c4 | 2897 | int r, srcu_idx; |
71cdb697 | 2898 | |
5bd5e8d8 | 2899 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
71cdb697 | 2900 | if (r < 0) |
971888c4 | 2901 | goto out; |
71cdb697 CH |
2902 | |
2903 | ops = bdev->bd_disk->fops->pr_ops; | |
2904 | if (ops && ops->pr_clear) | |
2905 | r = ops->pr_clear(bdev, key); | |
2906 | else | |
2907 | r = -EOPNOTSUPP; | |
971888c4 MS |
2908 | out: |
2909 | dm_unprepare_ioctl(md, srcu_idx); | |
71cdb697 CH |
2910 | return r; |
2911 | } | |
2912 | ||
2913 | static const struct pr_ops dm_pr_ops = { | |
2914 | .pr_register = dm_pr_register, | |
2915 | .pr_reserve = dm_pr_reserve, | |
2916 | .pr_release = dm_pr_release, | |
2917 | .pr_preempt = dm_pr_preempt, | |
2918 | .pr_clear = dm_pr_clear, | |
2919 | }; | |
2920 | ||
83d5cde4 | 2921 | static const struct block_device_operations dm_blk_dops = { |
c62b37d9 | 2922 | .submit_bio = dm_submit_bio, |
1da177e4 LT |
2923 | .open = dm_blk_open, |
2924 | .release = dm_blk_close, | |
aa129a22 | 2925 | .ioctl = dm_blk_ioctl, |
3ac51e74 | 2926 | .getgeo = dm_blk_getgeo, |
e76239a3 | 2927 | .report_zones = dm_blk_report_zones, |
71cdb697 | 2928 | .pr_ops = &dm_pr_ops, |
1da177e4 LT |
2929 | .owner = THIS_MODULE |
2930 | }; | |
2931 | ||
681cc5e8 MS |
2932 | static const struct block_device_operations dm_rq_blk_dops = { |
2933 | .open = dm_blk_open, | |
2934 | .release = dm_blk_close, | |
2935 | .ioctl = dm_blk_ioctl, | |
2936 | .getgeo = dm_blk_getgeo, | |
2937 | .pr_ops = &dm_pr_ops, | |
2938 | .owner = THIS_MODULE | |
2939 | }; | |
2940 | ||
f26c5719 DW |
2941 | static const struct dax_operations dm_dax_ops = { |
2942 | .direct_access = dm_dax_direct_access, | |
cdf6cdcd | 2943 | .zero_page_range = dm_dax_zero_page_range, |
f26c5719 DW |
2944 | }; |
2945 | ||
1da177e4 LT |
2946 | /* |
2947 | * module hooks | |
2948 | */ | |
2949 | module_init(dm_init); | |
2950 | module_exit(dm_exit); | |
2951 | ||
2952 | module_param(major, uint, 0); | |
2953 | MODULE_PARM_DESC(major, "The major number of the device mapper"); | |
f4790826 | 2954 | |
e8603136 MS |
2955 | module_param(reserved_bio_based_ios, uint, S_IRUGO | S_IWUSR); |
2956 | MODULE_PARM_DESC(reserved_bio_based_ios, "Reserved IOs in bio-based mempools"); | |
2957 | ||
115485e8 MS |
2958 | module_param(dm_numa_node, int, S_IRUGO | S_IWUSR); |
2959 | MODULE_PARM_DESC(dm_numa_node, "NUMA node for DM device memory allocations"); | |
2960 | ||
a666e5c0 MP |
2961 | module_param(swap_bios, int, S_IRUGO | S_IWUSR); |
2962 | MODULE_PARM_DESC(swap_bios, "Maximum allowed inflight swap IOs"); | |
2963 | ||
1da177e4 LT |
2964 | MODULE_DESCRIPTION(DM_NAME " driver"); |
2965 | MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>"); | |
2966 | MODULE_LICENSE("GPL"); |