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 | ||
8d394bc4 | 488 | static bool bio_is_flush_with_data(struct bio *bio) |
7465d7ac | 489 | { |
8d394bc4 MS |
490 | return ((bio->bi_opf & REQ_PREFLUSH) && bio->bi_iter.bi_size); |
491 | } | |
492 | ||
493 | static void dm_io_acct(bool end, struct mapped_device *md, struct bio *bio, | |
494 | unsigned long start_time, struct dm_stats_aux *stats_aux) | |
495 | { | |
496 | bool is_flush_with_data; | |
497 | unsigned int bi_size; | |
498 | ||
499 | /* If REQ_PREFLUSH set save any payload but do not account it */ | |
500 | is_flush_with_data = bio_is_flush_with_data(bio); | |
501 | if (is_flush_with_data) { | |
502 | bi_size = bio->bi_iter.bi_size; | |
503 | bio->bi_iter.bi_size = 0; | |
504 | } | |
505 | ||
506 | if (!end) | |
507 | bio_start_io_acct_time(bio, start_time); | |
508 | else | |
509 | bio_end_io_acct(bio, start_time); | |
7465d7ac | 510 | |
7465d7ac MS |
511 | if (unlikely(dm_stats_used(&md->stats))) |
512 | dm_stats_account_io(&md->stats, bio_data_dir(bio), | |
513 | bio->bi_iter.bi_sector, bio_sectors(bio), | |
8d394bc4 MS |
514 | end, start_time, stats_aux); |
515 | ||
516 | /* Restore bio's payload so it does get accounted upon requeue */ | |
517 | if (is_flush_with_data) | |
518 | bio->bi_iter.bi_size = bi_size; | |
519 | } | |
520 | ||
0ab30b40 | 521 | static void dm_start_io_acct(struct dm_io *io) |
8d394bc4 MS |
522 | { |
523 | dm_io_acct(false, io->md, io->orig_bio, io->start_time, &io->stats_aux); | |
7465d7ac MS |
524 | } |
525 | ||
0ab30b40 | 526 | static void dm_end_io_acct(struct dm_io *io) |
7465d7ac | 527 | { |
0ab30b40 | 528 | dm_io_acct(true, io->md, io->orig_bio, io->start_time, &io->stats_aux); |
7465d7ac | 529 | } |
978e51ba MS |
530 | |
531 | static struct dm_io *alloc_io(struct mapped_device *md, struct bio *bio) | |
1da177e4 | 532 | { |
64f52b0e MS |
533 | struct dm_io *io; |
534 | struct dm_target_io *tio; | |
535 | struct bio *clone; | |
536 | ||
abfc426d | 537 | clone = bio_alloc_clone(bio->bi_bdev, bio, GFP_NOIO, &md->io_bs); |
64f52b0e | 538 | |
6c23f0bd | 539 | tio = clone_to_tio(clone); |
64f52b0e MS |
540 | tio->inside_dm_io = true; |
541 | tio->io = NULL; | |
542 | ||
543 | io = container_of(tio, struct dm_io, tio); | |
544 | io->magic = DM_IO_MAGIC; | |
978e51ba MS |
545 | io->status = 0; |
546 | atomic_set(&io->io_count, 1); | |
9f6dc633 | 547 | this_cpu_inc(*md->pending_io); |
978e51ba MS |
548 | io->orig_bio = bio; |
549 | io->md = md; | |
550 | spin_lock_init(&io->endio_lock); | |
551 | ||
b879f915 | 552 | io->start_time = jiffies; |
64f52b0e | 553 | |
0cdb90f0 MS |
554 | dm_stats_record_start(&md->stats, &io->stats_aux); |
555 | ||
64f52b0e | 556 | return io; |
1da177e4 LT |
557 | } |
558 | ||
028867ac | 559 | static void free_io(struct mapped_device *md, struct dm_io *io) |
1da177e4 | 560 | { |
64f52b0e MS |
561 | bio_put(&io->tio.clone); |
562 | } | |
563 | ||
1d1068ce | 564 | static struct bio *alloc_tio(struct clone_info *ci, struct dm_target *ti, |
dc8e2021 | 565 | unsigned target_bio_nr, unsigned *len, gfp_t gfp_mask) |
64f52b0e MS |
566 | { |
567 | struct dm_target_io *tio; | |
568 | ||
569 | if (!ci->io->tio.io) { | |
570 | /* the dm_target_io embedded in ci->io is available */ | |
571 | tio = &ci->io->tio; | |
572 | } else { | |
abfc426d CH |
573 | struct bio *clone = bio_alloc_clone(ci->bio->bi_bdev, ci->bio, |
574 | gfp_mask, &ci->io->md->bs); | |
64f52b0e MS |
575 | if (!clone) |
576 | return NULL; | |
577 | ||
6c23f0bd | 578 | tio = clone_to_tio(clone); |
64f52b0e MS |
579 | tio->inside_dm_io = false; |
580 | } | |
56b4b5ab | 581 | |
64f52b0e MS |
582 | tio->magic = DM_TIO_MAGIC; |
583 | tio->io = ci->io; | |
584 | tio->ti = ti; | |
585 | tio->target_bio_nr = target_bio_nr; | |
dc8e2021 | 586 | tio->len_ptr = len; |
64f52b0e | 587 | |
1d1068ce | 588 | return &tio->clone; |
1da177e4 LT |
589 | } |
590 | ||
1d1068ce | 591 | static void free_tio(struct bio *clone) |
1da177e4 | 592 | { |
1d1068ce | 593 | if (clone_to_tio(clone)->inside_dm_io) |
64f52b0e | 594 | return; |
1d1068ce | 595 | bio_put(clone); |
1da177e4 LT |
596 | } |
597 | ||
598 | /* | |
599 | * Add the bio to the list of deferred io. | |
600 | */ | |
92c63902 | 601 | static void queue_io(struct mapped_device *md, struct bio *bio) |
1da177e4 | 602 | { |
05447420 | 603 | unsigned long flags; |
1da177e4 | 604 | |
05447420 | 605 | spin_lock_irqsave(&md->deferred_lock, flags); |
1da177e4 | 606 | bio_list_add(&md->deferred, bio); |
05447420 | 607 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
6a8736d1 | 608 | queue_work(md->wq, &md->work); |
1da177e4 LT |
609 | } |
610 | ||
611 | /* | |
612 | * Everyone (including functions in this file), should use this | |
613 | * function to access the md->map field, and make sure they call | |
83d5e5b0 | 614 | * dm_put_live_table() when finished. |
1da177e4 | 615 | */ |
83d5e5b0 | 616 | struct dm_table *dm_get_live_table(struct mapped_device *md, int *srcu_idx) __acquires(md->io_barrier) |
1da177e4 | 617 | { |
83d5e5b0 MP |
618 | *srcu_idx = srcu_read_lock(&md->io_barrier); |
619 | ||
620 | return srcu_dereference(md->map, &md->io_barrier); | |
621 | } | |
1da177e4 | 622 | |
83d5e5b0 MP |
623 | void dm_put_live_table(struct mapped_device *md, int srcu_idx) __releases(md->io_barrier) |
624 | { | |
625 | srcu_read_unlock(&md->io_barrier, srcu_idx); | |
626 | } | |
627 | ||
628 | void dm_sync_table(struct mapped_device *md) | |
629 | { | |
630 | synchronize_srcu(&md->io_barrier); | |
631 | synchronize_rcu_expedited(); | |
632 | } | |
633 | ||
634 | /* | |
635 | * A fast alternative to dm_get_live_table/dm_put_live_table. | |
636 | * The caller must not block between these two functions. | |
637 | */ | |
638 | static struct dm_table *dm_get_live_table_fast(struct mapped_device *md) __acquires(RCU) | |
639 | { | |
640 | rcu_read_lock(); | |
641 | return rcu_dereference(md->map); | |
642 | } | |
1da177e4 | 643 | |
83d5e5b0 MP |
644 | static void dm_put_live_table_fast(struct mapped_device *md) __releases(RCU) |
645 | { | |
646 | rcu_read_unlock(); | |
1da177e4 LT |
647 | } |
648 | ||
971888c4 MS |
649 | static char *_dm_claim_ptr = "I belong to device-mapper"; |
650 | ||
86f1152b BM |
651 | /* |
652 | * Open a table device so we can use it as a map destination. | |
653 | */ | |
654 | static int open_table_device(struct table_device *td, dev_t dev, | |
655 | struct mapped_device *md) | |
656 | { | |
86f1152b | 657 | struct block_device *bdev; |
cd913c76 | 658 | u64 part_off; |
86f1152b BM |
659 | int r; |
660 | ||
661 | BUG_ON(td->dm_dev.bdev); | |
662 | ||
519049af | 663 | bdev = blkdev_get_by_dev(dev, td->dm_dev.mode | FMODE_EXCL, _dm_claim_ptr); |
86f1152b BM |
664 | if (IS_ERR(bdev)) |
665 | return PTR_ERR(bdev); | |
666 | ||
667 | r = bd_link_disk_holder(bdev, dm_disk(md)); | |
668 | if (r) { | |
669 | blkdev_put(bdev, td->dm_dev.mode | FMODE_EXCL); | |
670 | return r; | |
671 | } | |
672 | ||
673 | td->dm_dev.bdev = bdev; | |
cd913c76 | 674 | td->dm_dev.dax_dev = fs_dax_get_by_bdev(bdev, &part_off); |
86f1152b BM |
675 | return 0; |
676 | } | |
677 | ||
678 | /* | |
679 | * Close a table device that we've been using. | |
680 | */ | |
681 | static void close_table_device(struct table_device *td, struct mapped_device *md) | |
682 | { | |
683 | if (!td->dm_dev.bdev) | |
684 | return; | |
685 | ||
686 | bd_unlink_disk_holder(td->dm_dev.bdev, dm_disk(md)); | |
687 | blkdev_put(td->dm_dev.bdev, td->dm_dev.mode | FMODE_EXCL); | |
817bf402 | 688 | put_dax(td->dm_dev.dax_dev); |
86f1152b | 689 | td->dm_dev.bdev = NULL; |
817bf402 | 690 | td->dm_dev.dax_dev = NULL; |
86f1152b BM |
691 | } |
692 | ||
693 | static struct table_device *find_table_device(struct list_head *l, dev_t dev, | |
8454fca4 SS |
694 | fmode_t mode) |
695 | { | |
86f1152b BM |
696 | struct table_device *td; |
697 | ||
698 | list_for_each_entry(td, l, list) | |
699 | if (td->dm_dev.bdev->bd_dev == dev && td->dm_dev.mode == mode) | |
700 | return td; | |
701 | ||
702 | return NULL; | |
703 | } | |
704 | ||
705 | int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode, | |
8454fca4 SS |
706 | struct dm_dev **result) |
707 | { | |
86f1152b BM |
708 | int r; |
709 | struct table_device *td; | |
710 | ||
711 | mutex_lock(&md->table_devices_lock); | |
712 | td = find_table_device(&md->table_devices, dev, mode); | |
713 | if (!td) { | |
115485e8 | 714 | td = kmalloc_node(sizeof(*td), GFP_KERNEL, md->numa_node_id); |
86f1152b BM |
715 | if (!td) { |
716 | mutex_unlock(&md->table_devices_lock); | |
717 | return -ENOMEM; | |
718 | } | |
719 | ||
720 | td->dm_dev.mode = mode; | |
721 | td->dm_dev.bdev = NULL; | |
722 | ||
723 | if ((r = open_table_device(td, dev, md))) { | |
724 | mutex_unlock(&md->table_devices_lock); | |
725 | kfree(td); | |
726 | return r; | |
727 | } | |
728 | ||
729 | format_dev_t(td->dm_dev.name, dev); | |
730 | ||
b0b4d7c6 | 731 | refcount_set(&td->count, 1); |
86f1152b | 732 | list_add(&td->list, &md->table_devices); |
b0b4d7c6 ER |
733 | } else { |
734 | refcount_inc(&td->count); | |
86f1152b | 735 | } |
86f1152b BM |
736 | mutex_unlock(&md->table_devices_lock); |
737 | ||
738 | *result = &td->dm_dev; | |
739 | return 0; | |
740 | } | |
86f1152b BM |
741 | |
742 | void dm_put_table_device(struct mapped_device *md, struct dm_dev *d) | |
743 | { | |
744 | struct table_device *td = container_of(d, struct table_device, dm_dev); | |
745 | ||
746 | mutex_lock(&md->table_devices_lock); | |
b0b4d7c6 | 747 | if (refcount_dec_and_test(&td->count)) { |
86f1152b BM |
748 | close_table_device(td, md); |
749 | list_del(&td->list); | |
750 | kfree(td); | |
751 | } | |
752 | mutex_unlock(&md->table_devices_lock); | |
753 | } | |
86f1152b BM |
754 | |
755 | static void free_table_devices(struct list_head *devices) | |
756 | { | |
757 | struct list_head *tmp, *next; | |
758 | ||
759 | list_for_each_safe(tmp, next, devices) { | |
760 | struct table_device *td = list_entry(tmp, struct table_device, list); | |
761 | ||
762 | DMWARN("dm_destroy: %s still exists with %d references", | |
b0b4d7c6 | 763 | td->dm_dev.name, refcount_read(&td->count)); |
86f1152b BM |
764 | kfree(td); |
765 | } | |
766 | } | |
767 | ||
3ac51e74 DW |
768 | /* |
769 | * Get the geometry associated with a dm device | |
770 | */ | |
771 | int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo) | |
772 | { | |
773 | *geo = md->geometry; | |
774 | ||
775 | return 0; | |
776 | } | |
777 | ||
778 | /* | |
779 | * Set the geometry of a device. | |
780 | */ | |
781 | int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo) | |
782 | { | |
783 | sector_t sz = (sector_t)geo->cylinders * geo->heads * geo->sectors; | |
784 | ||
785 | if (geo->start > sz) { | |
786 | DMWARN("Start sector is beyond the geometry limits."); | |
787 | return -EINVAL; | |
788 | } | |
789 | ||
790 | md->geometry = *geo; | |
791 | ||
792 | return 0; | |
793 | } | |
794 | ||
2e93ccc1 KU |
795 | static int __noflush_suspending(struct mapped_device *md) |
796 | { | |
797 | return test_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); | |
798 | } | |
799 | ||
1da177e4 LT |
800 | /* |
801 | * Decrements the number of outstanding ios that a bio has been | |
802 | * cloned into, completing the original io if necc. | |
803 | */ | |
e2118b3c | 804 | void dm_io_dec_pending(struct dm_io *io, blk_status_t error) |
1da177e4 | 805 | { |
2e93ccc1 | 806 | unsigned long flags; |
4e4cbee9 | 807 | blk_status_t io_error; |
b35f8caa MB |
808 | struct bio *bio; |
809 | struct mapped_device *md = io->md; | |
2e93ccc1 KU |
810 | |
811 | /* Push-back supersedes any I/O errors */ | |
f88fb981 KU |
812 | if (unlikely(error)) { |
813 | spin_lock_irqsave(&io->endio_lock, flags); | |
745dc570 | 814 | if (!(io->status == BLK_STS_DM_REQUEUE && __noflush_suspending(md))) |
4e4cbee9 | 815 | io->status = error; |
f88fb981 KU |
816 | spin_unlock_irqrestore(&io->endio_lock, flags); |
817 | } | |
1da177e4 LT |
818 | |
819 | if (atomic_dec_and_test(&io->io_count)) { | |
bf14e2b2 | 820 | bio = io->orig_bio; |
4e4cbee9 | 821 | if (io->status == BLK_STS_DM_REQUEUE) { |
2e93ccc1 KU |
822 | /* |
823 | * Target requested pushing back the I/O. | |
2e93ccc1 | 824 | */ |
022c2611 | 825 | spin_lock_irqsave(&md->deferred_lock, flags); |
bf14e2b2 DLM |
826 | if (__noflush_suspending(md) && |
827 | !WARN_ON_ONCE(dm_is_zone_write(md, bio))) { | |
745dc570 | 828 | /* NOTE early return due to BLK_STS_DM_REQUEUE below */ |
bf14e2b2 DLM |
829 | bio_list_add_head(&md->deferred, bio); |
830 | } else { | |
831 | /* | |
832 | * noflush suspend was interrupted or this is | |
833 | * a write to a zoned target. | |
834 | */ | |
4e4cbee9 | 835 | io->status = BLK_STS_IOERR; |
bf14e2b2 | 836 | } |
022c2611 | 837 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
2e93ccc1 KU |
838 | } |
839 | ||
4e4cbee9 | 840 | io_error = io->status; |
0ab30b40 | 841 | dm_end_io_acct(io); |
6a8736d1 | 842 | free_io(md, io); |
9f6dc633 MS |
843 | smp_wmb(); |
844 | this_cpu_dec(*md->pending_io); | |
845 | ||
846 | /* nudge anyone waiting on suspend queue */ | |
847 | if (unlikely(wq_has_sleeper(&md->wait))) | |
848 | wake_up(&md->wait); | |
6a8736d1 | 849 | |
4e4cbee9 | 850 | if (io_error == BLK_STS_DM_REQUEUE) |
6a8736d1 | 851 | return; |
2e93ccc1 | 852 | |
8d394bc4 | 853 | if (bio_is_flush_with_data(bio)) { |
af7e466a | 854 | /* |
6a8736d1 | 855 | * Preflush done for flush with data, reissue |
28a8f0d3 | 856 | * without REQ_PREFLUSH. |
af7e466a | 857 | */ |
1eff9d32 | 858 | bio->bi_opf &= ~REQ_PREFLUSH; |
6a8736d1 | 859 | queue_io(md, bio); |
af7e466a | 860 | } else { |
b372d360 | 861 | /* done with normal IO or empty flush */ |
8dd601fa N |
862 | if (io_error) |
863 | bio->bi_status = io_error; | |
4246a0b6 | 864 | bio_endio(bio); |
b35f8caa | 865 | } |
1da177e4 LT |
866 | } |
867 | } | |
868 | ||
bcb44433 MS |
869 | void disable_discard(struct mapped_device *md) |
870 | { | |
871 | struct queue_limits *limits = dm_get_queue_limits(md); | |
872 | ||
873 | /* device doesn't really support DISCARD, disable it */ | |
874 | limits->max_discard_sectors = 0; | |
875 | blk_queue_flag_clear(QUEUE_FLAG_DISCARD, md->queue); | |
876 | } | |
877 | ||
4cc96131 | 878 | void disable_write_same(struct mapped_device *md) |
7eee4ae2 MS |
879 | { |
880 | struct queue_limits *limits = dm_get_queue_limits(md); | |
881 | ||
882 | /* device doesn't really support WRITE SAME, disable it */ | |
883 | limits->max_write_same_sectors = 0; | |
884 | } | |
885 | ||
ac62d620 CH |
886 | void disable_write_zeroes(struct mapped_device *md) |
887 | { | |
888 | struct queue_limits *limits = dm_get_queue_limits(md); | |
889 | ||
890 | /* device doesn't really support WRITE ZEROES, disable it */ | |
891 | limits->max_write_zeroes_sectors = 0; | |
892 | } | |
893 | ||
a666e5c0 MP |
894 | static bool swap_bios_limit(struct dm_target *ti, struct bio *bio) |
895 | { | |
896 | return unlikely((bio->bi_opf & REQ_SWAP) != 0) && unlikely(ti->limit_swap_bios); | |
897 | } | |
898 | ||
4246a0b6 | 899 | static void clone_endio(struct bio *bio) |
1da177e4 | 900 | { |
4e4cbee9 | 901 | blk_status_t error = bio->bi_status; |
6c23f0bd | 902 | struct dm_target_io *tio = clone_to_tio(bio); |
b35f8caa | 903 | struct dm_io *io = tio->io; |
9faf400f | 904 | struct mapped_device *md = tio->io->md; |
1da177e4 | 905 | dm_endio_fn endio = tio->ti->type->end_io; |
309dca30 | 906 | struct request_queue *q = bio->bi_bdev->bd_disk->queue; |
1da177e4 | 907 | |
9c37de29 | 908 | if (unlikely(error == BLK_STS_TARGET)) { |
bcb44433 | 909 | if (bio_op(bio) == REQ_OP_DISCARD && |
309dca30 | 910 | !q->limits.max_discard_sectors) |
bcb44433 MS |
911 | disable_discard(md); |
912 | else if (bio_op(bio) == REQ_OP_WRITE_SAME && | |
309dca30 | 913 | !q->limits.max_write_same_sectors) |
ac62d620 | 914 | disable_write_same(md); |
bcb44433 | 915 | else if (bio_op(bio) == REQ_OP_WRITE_ZEROES && |
309dca30 | 916 | !q->limits.max_write_zeroes_sectors) |
ac62d620 CH |
917 | disable_write_zeroes(md); |
918 | } | |
7eee4ae2 | 919 | |
bb37d772 DLM |
920 | if (blk_queue_is_zoned(q)) |
921 | dm_zone_endio(io, bio); | |
415c79e1 | 922 | |
1be56909 | 923 | if (endio) { |
4e4cbee9 | 924 | int r = endio(tio->ti, bio, &error); |
1be56909 CH |
925 | switch (r) { |
926 | case DM_ENDIO_REQUEUE: | |
bf14e2b2 DLM |
927 | /* |
928 | * Requeuing writes to a sequential zone of a zoned | |
929 | * target will break the sequential write pattern: | |
930 | * fail such IO. | |
931 | */ | |
932 | if (WARN_ON_ONCE(dm_is_zone_write(md, bio))) | |
933 | error = BLK_STS_IOERR; | |
934 | else | |
935 | error = BLK_STS_DM_REQUEUE; | |
df561f66 | 936 | fallthrough; |
1be56909 CH |
937 | case DM_ENDIO_DONE: |
938 | break; | |
939 | case DM_ENDIO_INCOMPLETE: | |
940 | /* The target will handle the io */ | |
941 | return; | |
942 | default: | |
943 | DMWARN("unimplemented target endio return value: %d", r); | |
944 | BUG(); | |
945 | } | |
946 | } | |
947 | ||
a666e5c0 MP |
948 | if (unlikely(swap_bios_limit(tio->ti, bio))) { |
949 | struct mapped_device *md = io->md; | |
950 | up(&md->swap_bios_semaphore); | |
951 | } | |
952 | ||
1d1068ce | 953 | free_tio(bio); |
e2118b3c | 954 | dm_io_dec_pending(io, error); |
1da177e4 LT |
955 | } |
956 | ||
56a67df7 MS |
957 | /* |
958 | * Return maximum size of I/O possible at the supplied sector up to the current | |
959 | * target boundary. | |
960 | */ | |
3720281d MS |
961 | static inline sector_t max_io_len_target_boundary(struct dm_target *ti, |
962 | sector_t target_offset) | |
56a67df7 | 963 | { |
56a67df7 MS |
964 | return ti->len - target_offset; |
965 | } | |
966 | ||
3720281d | 967 | static sector_t max_io_len(struct dm_target *ti, sector_t sector) |
1da177e4 | 968 | { |
3720281d MS |
969 | sector_t target_offset = dm_target_offset(ti, sector); |
970 | sector_t len = max_io_len_target_boundary(ti, target_offset); | |
5091cdec | 971 | sector_t max_len; |
1da177e4 LT |
972 | |
973 | /* | |
3ee16db3 MS |
974 | * Does the target need to split IO even further? |
975 | * - varied (per target) IO splitting is a tenet of DM; this | |
976 | * explains why stacked chunk_sectors based splitting via | |
977 | * blk_max_size_offset() isn't possible here. So pass in | |
978 | * ti->max_io_len to override stacked chunk_sectors. | |
1da177e4 | 979 | */ |
3ee16db3 MS |
980 | if (ti->max_io_len) { |
981 | max_len = blk_max_size_offset(ti->table->md->queue, | |
982 | target_offset, ti->max_io_len); | |
983 | if (len > max_len) | |
984 | len = max_len; | |
985 | } | |
1da177e4 LT |
986 | |
987 | return len; | |
988 | } | |
989 | ||
542f9038 MS |
990 | int dm_set_target_max_io_len(struct dm_target *ti, sector_t len) |
991 | { | |
992 | if (len > UINT_MAX) { | |
993 | DMERR("Specified maximum size of target IO (%llu) exceeds limit (%u)", | |
994 | (unsigned long long)len, UINT_MAX); | |
995 | ti->error = "Maximum size of target IO is too large"; | |
996 | return -EINVAL; | |
997 | } | |
998 | ||
75ae1936 | 999 | ti->max_io_len = (uint32_t) len; |
542f9038 MS |
1000 | |
1001 | return 0; | |
1002 | } | |
1003 | EXPORT_SYMBOL_GPL(dm_set_target_max_io_len); | |
1004 | ||
f26c5719 | 1005 | static struct dm_target *dm_dax_get_live_target(struct mapped_device *md, |
3d97c829 MS |
1006 | sector_t sector, int *srcu_idx) |
1007 | __acquires(md->io_barrier) | |
545ed20e | 1008 | { |
545ed20e TK |
1009 | struct dm_table *map; |
1010 | struct dm_target *ti; | |
545ed20e | 1011 | |
f26c5719 | 1012 | map = dm_get_live_table(md, srcu_idx); |
545ed20e | 1013 | if (!map) |
f26c5719 | 1014 | return NULL; |
545ed20e TK |
1015 | |
1016 | ti = dm_table_find_target(map, sector); | |
123d87d5 | 1017 | if (!ti) |
f26c5719 | 1018 | return NULL; |
545ed20e | 1019 | |
f26c5719 DW |
1020 | return ti; |
1021 | } | |
545ed20e | 1022 | |
f26c5719 | 1023 | static long dm_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, |
3d97c829 | 1024 | long nr_pages, void **kaddr, pfn_t *pfn) |
f26c5719 DW |
1025 | { |
1026 | struct mapped_device *md = dax_get_private(dax_dev); | |
1027 | sector_t sector = pgoff * PAGE_SECTORS; | |
1028 | struct dm_target *ti; | |
1029 | long len, ret = -EIO; | |
1030 | int srcu_idx; | |
545ed20e | 1031 | |
f26c5719 | 1032 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); |
545ed20e | 1033 | |
f26c5719 DW |
1034 | if (!ti) |
1035 | goto out; | |
1036 | if (!ti->type->direct_access) | |
1037 | goto out; | |
3720281d | 1038 | len = max_io_len(ti, sector) / PAGE_SECTORS; |
f26c5719 DW |
1039 | if (len < 1) |
1040 | goto out; | |
1041 | nr_pages = min(len, nr_pages); | |
dbc62659 | 1042 | ret = ti->type->direct_access(ti, pgoff, nr_pages, kaddr, pfn); |
817bf402 | 1043 | |
f26c5719 | 1044 | out: |
545ed20e | 1045 | dm_put_live_table(md, srcu_idx); |
f26c5719 DW |
1046 | |
1047 | return ret; | |
545ed20e TK |
1048 | } |
1049 | ||
cdf6cdcd VG |
1050 | static int dm_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, |
1051 | size_t nr_pages) | |
1052 | { | |
1053 | struct mapped_device *md = dax_get_private(dax_dev); | |
1054 | sector_t sector = pgoff * PAGE_SECTORS; | |
1055 | struct dm_target *ti; | |
1056 | int ret = -EIO; | |
1057 | int srcu_idx; | |
1058 | ||
1059 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); | |
1060 | ||
1061 | if (!ti) | |
1062 | goto out; | |
1063 | if (WARN_ON(!ti->type->dax_zero_page_range)) { | |
1064 | /* | |
1065 | * ->zero_page_range() is mandatory dax operation. If we are | |
1066 | * here, something is wrong. | |
1067 | */ | |
cdf6cdcd VG |
1068 | goto out; |
1069 | } | |
1070 | ret = ti->type->dax_zero_page_range(ti, pgoff, nr_pages); | |
cdf6cdcd VG |
1071 | out: |
1072 | dm_put_live_table(md, srcu_idx); | |
1073 | ||
1074 | return ret; | |
1075 | } | |
1076 | ||
1dd40c3e MP |
1077 | /* |
1078 | * A target may call dm_accept_partial_bio only from the map routine. It is | |
6842d264 DLM |
1079 | * allowed for all bio types except REQ_PREFLUSH, REQ_OP_ZONE_* zone management |
1080 | * operations and REQ_OP_ZONE_APPEND (zone append writes). | |
1dd40c3e MP |
1081 | * |
1082 | * dm_accept_partial_bio informs the dm that the target only wants to process | |
1083 | * additional n_sectors sectors of the bio and the rest of the data should be | |
1084 | * sent in a next bio. | |
1085 | * | |
1086 | * A diagram that explains the arithmetics: | |
1087 | * +--------------------+---------------+-------+ | |
1088 | * | 1 | 2 | 3 | | |
1089 | * +--------------------+---------------+-------+ | |
1090 | * | |
1091 | * <-------------- *tio->len_ptr ---------------> | |
1092 | * <------- bi_size -------> | |
1093 | * <-- n_sectors --> | |
1094 | * | |
1095 | * Region 1 was already iterated over with bio_advance or similar function. | |
1096 | * (it may be empty if the target doesn't use bio_advance) | |
1097 | * Region 2 is the remaining bio size that the target wants to process. | |
1098 | * (it may be empty if region 1 is non-empty, although there is no reason | |
1099 | * to make it empty) | |
1100 | * The target requires that region 3 is to be sent in the next bio. | |
1101 | * | |
1102 | * If the target wants to receive multiple copies of the bio (via num_*bios, etc), | |
1103 | * the partially processed part (the sum of regions 1+2) must be the same for all | |
1104 | * copies of the bio. | |
1105 | */ | |
1106 | void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors) | |
1107 | { | |
6c23f0bd | 1108 | struct dm_target_io *tio = clone_to_tio(bio); |
1dd40c3e | 1109 | unsigned bi_size = bio->bi_iter.bi_size >> SECTOR_SHIFT; |
6842d264 | 1110 | |
1eff9d32 | 1111 | BUG_ON(bio->bi_opf & REQ_PREFLUSH); |
6842d264 DLM |
1112 | BUG_ON(op_is_zone_mgmt(bio_op(bio))); |
1113 | BUG_ON(bio_op(bio) == REQ_OP_ZONE_APPEND); | |
1dd40c3e MP |
1114 | BUG_ON(bi_size > *tio->len_ptr); |
1115 | BUG_ON(n_sectors > bi_size); | |
6842d264 | 1116 | |
1dd40c3e MP |
1117 | *tio->len_ptr -= bi_size - n_sectors; |
1118 | bio->bi_iter.bi_size = n_sectors << SECTOR_SHIFT; | |
1119 | } | |
1120 | EXPORT_SYMBOL_GPL(dm_accept_partial_bio); | |
1121 | ||
a666e5c0 MP |
1122 | static noinline void __set_swap_bios_limit(struct mapped_device *md, int latch) |
1123 | { | |
1124 | mutex_lock(&md->swap_bios_lock); | |
1125 | while (latch < md->swap_bios) { | |
1126 | cond_resched(); | |
1127 | down(&md->swap_bios_semaphore); | |
1128 | md->swap_bios--; | |
1129 | } | |
1130 | while (latch > md->swap_bios) { | |
1131 | cond_resched(); | |
1132 | up(&md->swap_bios_semaphore); | |
1133 | md->swap_bios++; | |
1134 | } | |
1135 | mutex_unlock(&md->swap_bios_lock); | |
1136 | } | |
1137 | ||
1561b396 | 1138 | static void __map_bio(struct bio *clone) |
1da177e4 | 1139 | { |
1561b396 | 1140 | struct dm_target_io *tio = clone_to_tio(clone); |
1da177e4 | 1141 | int r; |
2056a782 | 1142 | sector_t sector; |
64f52b0e | 1143 | struct dm_io *io = tio->io; |
bd2a49b8 | 1144 | struct dm_target *ti = tio->ti; |
1da177e4 | 1145 | |
1da177e4 | 1146 | clone->bi_end_io = clone_endio; |
1da177e4 LT |
1147 | |
1148 | /* | |
1149 | * Map the clone. If r == 0 we don't need to do | |
1150 | * anything, the target has assumed ownership of | |
1151 | * this io. | |
1152 | */ | |
e2118b3c | 1153 | dm_io_inc_pending(io); |
4f024f37 | 1154 | sector = clone->bi_iter.bi_sector; |
d67a5f4b | 1155 | |
a666e5c0 MP |
1156 | if (unlikely(swap_bios_limit(ti, clone))) { |
1157 | struct mapped_device *md = io->md; | |
1158 | int latch = get_swap_bios(); | |
1159 | if (unlikely(latch != md->swap_bios)) | |
1160 | __set_swap_bios_limit(md, latch); | |
1161 | down(&md->swap_bios_semaphore); | |
1162 | } | |
1163 | ||
bb37d772 DLM |
1164 | /* |
1165 | * Check if the IO needs a special mapping due to zone append emulation | |
1166 | * on zoned target. In this case, dm_zone_map_bio() calls the target | |
1167 | * map operation. | |
1168 | */ | |
1169 | if (dm_emulate_zone_append(io->md)) | |
1170 | r = dm_zone_map_bio(tio); | |
1171 | else | |
1172 | r = ti->type->map(ti, clone); | |
1173 | ||
846785e6 CH |
1174 | switch (r) { |
1175 | case DM_MAPIO_SUBMITTED: | |
1176 | break; | |
1177 | case DM_MAPIO_REMAPPED: | |
1da177e4 | 1178 | /* the bio has been remapped so dispatch it */ |
1c02fca6 | 1179 | trace_block_bio_remap(clone, bio_dev(io->orig_bio), sector); |
3e08773c | 1180 | submit_bio_noacct(clone); |
846785e6 CH |
1181 | break; |
1182 | case DM_MAPIO_KILL: | |
a666e5c0 MP |
1183 | if (unlikely(swap_bios_limit(ti, clone))) { |
1184 | struct mapped_device *md = io->md; | |
1185 | up(&md->swap_bios_semaphore); | |
1186 | } | |
1d1068ce | 1187 | free_tio(clone); |
e2118b3c | 1188 | dm_io_dec_pending(io, BLK_STS_IOERR); |
4e4cbee9 | 1189 | break; |
846785e6 | 1190 | case DM_MAPIO_REQUEUE: |
a666e5c0 MP |
1191 | if (unlikely(swap_bios_limit(ti, clone))) { |
1192 | struct mapped_device *md = io->md; | |
1193 | up(&md->swap_bios_semaphore); | |
1194 | } | |
1d1068ce | 1195 | free_tio(clone); |
e2118b3c | 1196 | dm_io_dec_pending(io, BLK_STS_DM_REQUEUE); |
846785e6 CH |
1197 | break; |
1198 | default: | |
45cbcd79 KU |
1199 | DMWARN("unimplemented target map return value: %d", r); |
1200 | BUG(); | |
1da177e4 LT |
1201 | } |
1202 | } | |
1da177e4 | 1203 | |
e0d6609a | 1204 | static void bio_setup_sector(struct bio *bio, sector_t sector, unsigned len) |
bd2a49b8 | 1205 | { |
4f024f37 KO |
1206 | bio->bi_iter.bi_sector = sector; |
1207 | bio->bi_iter.bi_size = to_bytes(len); | |
1da177e4 LT |
1208 | } |
1209 | ||
318716dd | 1210 | static void alloc_multiple_bios(struct bio_list *blist, struct clone_info *ci, |
dc8e2021 CH |
1211 | struct dm_target *ti, unsigned num_bios, |
1212 | unsigned *len) | |
f9ab94ce | 1213 | { |
1d1068ce | 1214 | struct bio *bio; |
318716dd | 1215 | int try; |
dba14160 | 1216 | |
318716dd MS |
1217 | for (try = 0; try < 2; try++) { |
1218 | int bio_nr; | |
318716dd MS |
1219 | |
1220 | if (try) | |
bc02cdbe | 1221 | mutex_lock(&ci->io->md->table_devices_lock); |
318716dd | 1222 | for (bio_nr = 0; bio_nr < num_bios; bio_nr++) { |
1d1068ce | 1223 | bio = alloc_tio(ci, ti, bio_nr, len, |
dc8e2021 | 1224 | try ? GFP_NOIO : GFP_NOWAIT); |
1d1068ce | 1225 | if (!bio) |
318716dd MS |
1226 | break; |
1227 | ||
1d1068ce | 1228 | bio_list_add(blist, bio); |
318716dd MS |
1229 | } |
1230 | if (try) | |
bc02cdbe | 1231 | mutex_unlock(&ci->io->md->table_devices_lock); |
318716dd MS |
1232 | if (bio_nr == num_bios) |
1233 | return; | |
1234 | ||
6c23f0bd | 1235 | while ((bio = bio_list_pop(blist))) |
1d1068ce | 1236 | free_tio(bio); |
318716dd | 1237 | } |
9015df24 AK |
1238 | } |
1239 | ||
14fe594d | 1240 | static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti, |
1dd40c3e | 1241 | unsigned num_bios, unsigned *len) |
06a426ce | 1242 | { |
318716dd | 1243 | struct bio_list blist = BIO_EMPTY_LIST; |
8eabf5d0 | 1244 | struct bio *clone; |
318716dd | 1245 | |
891fced6 CH |
1246 | switch (num_bios) { |
1247 | case 0: | |
1248 | break; | |
1249 | case 1: | |
1250 | clone = alloc_tio(ci, ti, 0, len, GFP_NOIO); | |
8eabf5d0 CH |
1251 | if (len) |
1252 | bio_setup_sector(clone, ci->sector, *len); | |
1561b396 | 1253 | __map_bio(clone); |
891fced6 CH |
1254 | break; |
1255 | default: | |
1256 | alloc_multiple_bios(&blist, ci, ti, num_bios, len); | |
1257 | while ((clone = bio_list_pop(&blist))) { | |
1258 | if (len) | |
1259 | bio_setup_sector(clone, ci->sector, *len); | |
1260 | __map_bio(clone); | |
1261 | } | |
1262 | break; | |
8eabf5d0 | 1263 | } |
06a426ce MS |
1264 | } |
1265 | ||
14fe594d | 1266 | static int __send_empty_flush(struct clone_info *ci) |
f9ab94ce | 1267 | { |
06a426ce | 1268 | unsigned target_nr = 0; |
f9ab94ce | 1269 | struct dm_target *ti; |
828678b8 MS |
1270 | struct bio flush_bio; |
1271 | ||
1272 | /* | |
1273 | * Use an on-stack bio for this, it's safe since we don't | |
1274 | * need to reference it after submit. It's just used as | |
1275 | * the basis for the clone(s). | |
1276 | */ | |
49add496 CH |
1277 | bio_init(&flush_bio, ci->io->md->disk->part0, NULL, 0, |
1278 | REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC); | |
47d95102 | 1279 | |
828678b8 MS |
1280 | ci->bio = &flush_bio; |
1281 | ci->sector_count = 0; | |
f9ab94ce | 1282 | |
b372d360 | 1283 | BUG_ON(bio_has_data(ci->bio)); |
f9ab94ce | 1284 | while ((ti = dm_table_get_target(ci->map, target_nr++))) |
1dd40c3e | 1285 | __send_duplicate_bios(ci, ti, ti->num_flush_bios, NULL); |
828678b8 MS |
1286 | |
1287 | bio_uninit(ci->bio); | |
f9ab94ce MP |
1288 | return 0; |
1289 | } | |
1290 | ||
3d7f4562 | 1291 | static int __send_changing_extent_only(struct clone_info *ci, struct dm_target *ti, |
61697a6a | 1292 | unsigned num_bios) |
ba1cbad9 | 1293 | { |
51b86f9a | 1294 | unsigned len; |
ba1cbad9 | 1295 | |
3d7f4562 MS |
1296 | /* |
1297 | * Even though the device advertised support for this type of | |
1298 | * request, that does not mean every target supports it, and | |
1299 | * reconfiguration might also have changed that since the | |
1300 | * check was performed. | |
1301 | */ | |
3d7f4562 MS |
1302 | if (!num_bios) |
1303 | return -EOPNOTSUPP; | |
ba1cbad9 | 1304 | |
3720281d MS |
1305 | len = min_t(sector_t, ci->sector_count, |
1306 | max_io_len_target_boundary(ti, dm_target_offset(ti, ci->sector))); | |
51b86f9a | 1307 | |
3d7f4562 | 1308 | __send_duplicate_bios(ci, ti, num_bios, &len); |
e262f347 | 1309 | |
3d7f4562 MS |
1310 | ci->sector += len; |
1311 | ci->sector_count -= len; | |
5ae89a87 MS |
1312 | |
1313 | return 0; | |
ba1cbad9 MS |
1314 | } |
1315 | ||
568c73a3 MS |
1316 | static bool is_abnormal_io(struct bio *bio) |
1317 | { | |
1318 | bool r = false; | |
1319 | ||
1320 | switch (bio_op(bio)) { | |
1321 | case REQ_OP_DISCARD: | |
1322 | case REQ_OP_SECURE_ERASE: | |
1323 | case REQ_OP_WRITE_SAME: | |
1324 | case REQ_OP_WRITE_ZEROES: | |
1325 | r = true; | |
1326 | break; | |
1327 | } | |
1328 | ||
1329 | return r; | |
1330 | } | |
1331 | ||
0519c71e MS |
1332 | static bool __process_abnormal_io(struct clone_info *ci, struct dm_target *ti, |
1333 | int *result) | |
1334 | { | |
1335 | struct bio *bio = ci->bio; | |
9679b5a7 | 1336 | unsigned num_bios = 0; |
0519c71e | 1337 | |
9679b5a7 MS |
1338 | switch (bio_op(bio)) { |
1339 | case REQ_OP_DISCARD: | |
1340 | num_bios = ti->num_discard_bios; | |
1341 | break; | |
1342 | case REQ_OP_SECURE_ERASE: | |
1343 | num_bios = ti->num_secure_erase_bios; | |
1344 | break; | |
1345 | case REQ_OP_WRITE_SAME: | |
1346 | num_bios = ti->num_write_same_bios; | |
1347 | break; | |
1348 | case REQ_OP_WRITE_ZEROES: | |
1349 | num_bios = ti->num_write_zeroes_bios; | |
1350 | break; | |
1351 | default: | |
0519c71e | 1352 | return false; |
9679b5a7 | 1353 | } |
0519c71e | 1354 | |
9679b5a7 | 1355 | *result = __send_changing_extent_only(ci, ti, num_bios); |
0519c71e MS |
1356 | return true; |
1357 | } | |
1358 | ||
e4c93811 AK |
1359 | /* |
1360 | * Select the correct strategy for processing a non-flush bio. | |
1361 | */ | |
96c9865c | 1362 | static int __split_and_process_bio(struct clone_info *ci) |
0ce65797 | 1363 | { |
66bdaa43 | 1364 | struct bio *clone; |
512875bd | 1365 | struct dm_target *ti; |
1c3b13e6 | 1366 | unsigned len; |
c80914e8 | 1367 | int r; |
0ce65797 | 1368 | |
512875bd | 1369 | ti = dm_table_find_target(ci->map, ci->sector); |
123d87d5 | 1370 | if (!ti) |
512875bd JN |
1371 | return -EIO; |
1372 | ||
568c73a3 | 1373 | if (__process_abnormal_io(ci, ti, &r)) |
0519c71e | 1374 | return r; |
3d7f4562 | 1375 | |
3720281d | 1376 | len = min_t(sector_t, max_io_len(ti, ci->sector), ci->sector_count); |
0ce65797 | 1377 | |
66bdaa43 MS |
1378 | clone = alloc_tio(ci, ti, 0, &len, GFP_NOIO); |
1379 | bio_advance(clone, to_bytes(ci->sector - clone->bi_iter.bi_sector)); | |
1380 | clone->bi_iter.bi_size = to_bytes(len); | |
1381 | if (bio_integrity(clone)) | |
1382 | bio_integrity_trim(clone); | |
1383 | ||
1384 | __map_bio(clone); | |
0ce65797 | 1385 | |
1c3b13e6 KO |
1386 | ci->sector += len; |
1387 | ci->sector_count -= len; | |
0ce65797 | 1388 | |
1c3b13e6 | 1389 | return 0; |
0ce65797 MS |
1390 | } |
1391 | ||
978e51ba MS |
1392 | static void init_clone_info(struct clone_info *ci, struct mapped_device *md, |
1393 | struct dm_table *map, struct bio *bio) | |
1394 | { | |
1395 | ci->map = map; | |
1396 | ci->io = alloc_io(md, bio); | |
d41e077a | 1397 | ci->bio = bio; |
978e51ba | 1398 | ci->sector = bio->bi_iter.bi_sector; |
d41e077a MS |
1399 | ci->sector_count = bio_sectors(bio); |
1400 | ||
1401 | /* Shouldn't happen but sector_count was being set to 0 so... */ | |
1402 | if (WARN_ON_ONCE(op_is_zone_mgmt(bio_op(bio)) && ci->sector_count)) | |
1403 | ci->sector_count = 0; | |
978e51ba MS |
1404 | } |
1405 | ||
1da177e4 | 1406 | /* |
14fe594d | 1407 | * Entry point to split a bio into clones and submit them to the targets. |
1da177e4 | 1408 | */ |
96c9865c MS |
1409 | static void dm_split_and_process_bio(struct mapped_device *md, |
1410 | struct dm_table *map, struct bio *bio) | |
0ce65797 | 1411 | { |
1da177e4 | 1412 | struct clone_info ci; |
d41e077a | 1413 | struct bio *b; |
512875bd | 1414 | int error = 0; |
1da177e4 | 1415 | |
978e51ba | 1416 | init_clone_info(&ci, md, map, bio); |
0ce65797 | 1417 | |
1eff9d32 | 1418 | if (bio->bi_opf & REQ_PREFLUSH) { |
14fe594d | 1419 | error = __send_empty_flush(&ci); |
e2118b3c | 1420 | /* dm_io_dec_pending submits any data associated with flush */ |
d41e077a | 1421 | goto out; |
d87f4c14 | 1422 | } |
0ce65797 | 1423 | |
d41e077a MS |
1424 | error = __split_and_process_bio(&ci); |
1425 | if (error || !ci.sector_count) | |
1426 | goto out; | |
1427 | ||
1428 | /* | |
1429 | * Remainder must be passed to submit_bio_noacct() so it gets handled | |
1430 | * *after* bios already submitted have been completely processed. | |
1431 | * We take a clone of the original to store in ci.io->orig_bio to be | |
1432 | * used by dm_end_io_acct() and for dm_io_dec_pending() to use for | |
1433 | * completion handling. | |
1434 | */ | |
1435 | b = bio_split(bio, bio_sectors(bio) - ci.sector_count, | |
1436 | GFP_NOIO, &md->queue->bio_split); | |
1437 | ci.io->orig_bio = b; | |
1438 | ||
1439 | bio_chain(b, bio); | |
1440 | trace_block_split(b, bio->bi_iter.bi_sector); | |
1441 | submit_bio_noacct(bio); | |
1442 | out: | |
1443 | dm_start_io_acct(ci.io); | |
1da177e4 | 1444 | /* drop the extra reference count */ |
e2118b3c | 1445 | dm_io_dec_pending(ci.io, errno_to_blk_status(error)); |
0ce65797 MS |
1446 | } |
1447 | ||
3e08773c | 1448 | static void dm_submit_bio(struct bio *bio) |
cec47e3d | 1449 | { |
309dca30 | 1450 | struct mapped_device *md = bio->bi_bdev->bd_disk->private_data; |
83d5e5b0 MP |
1451 | int srcu_idx; |
1452 | struct dm_table *map; | |
cec47e3d | 1453 | |
83d5e5b0 | 1454 | map = dm_get_live_table(md, &srcu_idx); |
b2abdb1b MS |
1455 | if (unlikely(!map)) { |
1456 | DMERR_LIMIT("%s: mapping table unavailable, erroring io", | |
1457 | dm_device_name(md)); | |
1458 | bio_io_error(bio); | |
1459 | goto out; | |
1460 | } | |
29e4013d | 1461 | |
b2abdb1b | 1462 | /* If suspended, queue this IO for later */ |
6a8736d1 | 1463 | if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags))) { |
6abc4946 KK |
1464 | if (bio->bi_opf & REQ_NOWAIT) |
1465 | bio_wouldblock_error(bio); | |
b2abdb1b | 1466 | else if (bio->bi_opf & REQ_RAHEAD) |
54d9a1b4 | 1467 | bio_io_error(bio); |
b2abdb1b MS |
1468 | else |
1469 | queue_io(md, bio); | |
1470 | goto out; | |
cec47e3d | 1471 | } |
1da177e4 | 1472 | |
b2abdb1b MS |
1473 | /* |
1474 | * Use blk_queue_split() for abnormal IO (e.g. discard, writesame, etc) | |
1475 | * otherwise associated queue_limits won't be imposed. | |
1476 | */ | |
1477 | if (is_abnormal_io(bio)) | |
1478 | blk_queue_split(&bio); | |
978e51ba | 1479 | |
96c9865c | 1480 | dm_split_and_process_bio(md, map, bio); |
b2abdb1b | 1481 | out: |
83d5e5b0 | 1482 | dm_put_live_table(md, srcu_idx); |
978e51ba MS |
1483 | } |
1484 | ||
1da177e4 LT |
1485 | /*----------------------------------------------------------------- |
1486 | * An IDR is used to keep track of allocated minor numbers. | |
1487 | *---------------------------------------------------------------*/ | |
2b06cfff | 1488 | static void free_minor(int minor) |
1da177e4 | 1489 | { |
f32c10b0 | 1490 | spin_lock(&_minor_lock); |
1da177e4 | 1491 | idr_remove(&_minor_idr, minor); |
f32c10b0 | 1492 | spin_unlock(&_minor_lock); |
1da177e4 LT |
1493 | } |
1494 | ||
1495 | /* | |
1496 | * See if the device with a specific minor # is free. | |
1497 | */ | |
cf13ab8e | 1498 | static int specific_minor(int minor) |
1da177e4 | 1499 | { |
c9d76be6 | 1500 | int r; |
1da177e4 LT |
1501 | |
1502 | if (minor >= (1 << MINORBITS)) | |
1503 | return -EINVAL; | |
1504 | ||
c9d76be6 | 1505 | idr_preload(GFP_KERNEL); |
f32c10b0 | 1506 | spin_lock(&_minor_lock); |
1da177e4 | 1507 | |
c9d76be6 | 1508 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, minor, minor + 1, GFP_NOWAIT); |
1da177e4 | 1509 | |
f32c10b0 | 1510 | spin_unlock(&_minor_lock); |
c9d76be6 TH |
1511 | idr_preload_end(); |
1512 | if (r < 0) | |
1513 | return r == -ENOSPC ? -EBUSY : r; | |
1514 | return 0; | |
1da177e4 LT |
1515 | } |
1516 | ||
cf13ab8e | 1517 | static int next_free_minor(int *minor) |
1da177e4 | 1518 | { |
c9d76be6 | 1519 | int r; |
62f75c2f | 1520 | |
c9d76be6 | 1521 | idr_preload(GFP_KERNEL); |
f32c10b0 | 1522 | spin_lock(&_minor_lock); |
1da177e4 | 1523 | |
c9d76be6 | 1524 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, 0, 1 << MINORBITS, GFP_NOWAIT); |
1da177e4 | 1525 | |
f32c10b0 | 1526 | spin_unlock(&_minor_lock); |
c9d76be6 TH |
1527 | idr_preload_end(); |
1528 | if (r < 0) | |
1529 | return r; | |
1530 | *minor = r; | |
1531 | return 0; | |
1da177e4 LT |
1532 | } |
1533 | ||
83d5cde4 | 1534 | static const struct block_device_operations dm_blk_dops; |
681cc5e8 | 1535 | static const struct block_device_operations dm_rq_blk_dops; |
f26c5719 | 1536 | static const struct dax_operations dm_dax_ops; |
1da177e4 | 1537 | |
53d5914f MP |
1538 | static void dm_wq_work(struct work_struct *work); |
1539 | ||
aa6ce87a | 1540 | #ifdef CONFIG_BLK_INLINE_ENCRYPTION |
cb77cb5a | 1541 | static void dm_queue_destroy_crypto_profile(struct request_queue *q) |
aa6ce87a | 1542 | { |
cb77cb5a | 1543 | dm_destroy_crypto_profile(q->crypto_profile); |
aa6ce87a ST |
1544 | } |
1545 | ||
1546 | #else /* CONFIG_BLK_INLINE_ENCRYPTION */ | |
1547 | ||
cb77cb5a | 1548 | static inline void dm_queue_destroy_crypto_profile(struct request_queue *q) |
aa6ce87a ST |
1549 | { |
1550 | } | |
1551 | #endif /* !CONFIG_BLK_INLINE_ENCRYPTION */ | |
1552 | ||
0f20972f MS |
1553 | static void cleanup_mapped_device(struct mapped_device *md) |
1554 | { | |
0f20972f MS |
1555 | if (md->wq) |
1556 | destroy_workqueue(md->wq); | |
6f1c819c KO |
1557 | bioset_exit(&md->bs); |
1558 | bioset_exit(&md->io_bs); | |
0f20972f | 1559 | |
f26c5719 | 1560 | if (md->dax_dev) { |
fb08a190 | 1561 | dax_remove_host(md->disk); |
f26c5719 DW |
1562 | kill_dax(md->dax_dev); |
1563 | put_dax(md->dax_dev); | |
1564 | md->dax_dev = NULL; | |
1565 | } | |
1566 | ||
0f20972f MS |
1567 | if (md->disk) { |
1568 | spin_lock(&_minor_lock); | |
1569 | md->disk->private_data = NULL; | |
1570 | spin_unlock(&_minor_lock); | |
89f871af CH |
1571 | if (dm_get_md_type(md) != DM_TYPE_NONE) { |
1572 | dm_sysfs_exit(md); | |
1573 | del_gendisk(md->disk); | |
1574 | } | |
cb77cb5a | 1575 | dm_queue_destroy_crypto_profile(md->queue); |
74fe6ba9 | 1576 | blk_cleanup_disk(md->disk); |
74a2b6ec | 1577 | } |
0f20972f | 1578 | |
9f6dc633 MS |
1579 | if (md->pending_io) { |
1580 | free_percpu(md->pending_io); | |
1581 | md->pending_io = NULL; | |
1582 | } | |
1583 | ||
d09960b0 TE |
1584 | cleanup_srcu_struct(&md->io_barrier); |
1585 | ||
d5ffebdd MS |
1586 | mutex_destroy(&md->suspend_lock); |
1587 | mutex_destroy(&md->type_lock); | |
1588 | mutex_destroy(&md->table_devices_lock); | |
a666e5c0 | 1589 | mutex_destroy(&md->swap_bios_lock); |
d5ffebdd | 1590 | |
4cc96131 | 1591 | dm_mq_cleanup_mapped_device(md); |
bb37d772 | 1592 | dm_cleanup_zoned_dev(md); |
0f20972f MS |
1593 | } |
1594 | ||
1da177e4 LT |
1595 | /* |
1596 | * Allocate and initialise a blank device with a given minor. | |
1597 | */ | |
2b06cfff | 1598 | static struct mapped_device *alloc_dev(int minor) |
1da177e4 | 1599 | { |
115485e8 MS |
1600 | int r, numa_node_id = dm_get_numa_node(); |
1601 | struct mapped_device *md; | |
ba61fdd1 | 1602 | void *old_md; |
1da177e4 | 1603 | |
856eb091 | 1604 | md = kvzalloc_node(sizeof(*md), GFP_KERNEL, numa_node_id); |
1da177e4 LT |
1605 | if (!md) { |
1606 | DMWARN("unable to allocate device, out of memory."); | |
1607 | return NULL; | |
1608 | } | |
1609 | ||
10da4f79 | 1610 | if (!try_module_get(THIS_MODULE)) |
6ed7ade8 | 1611 | goto bad_module_get; |
10da4f79 | 1612 | |
1da177e4 | 1613 | /* get a minor number for the dev */ |
2b06cfff | 1614 | if (minor == DM_ANY_MINOR) |
cf13ab8e | 1615 | r = next_free_minor(&minor); |
2b06cfff | 1616 | else |
cf13ab8e | 1617 | r = specific_minor(minor); |
1da177e4 | 1618 | if (r < 0) |
6ed7ade8 | 1619 | goto bad_minor; |
1da177e4 | 1620 | |
83d5e5b0 MP |
1621 | r = init_srcu_struct(&md->io_barrier); |
1622 | if (r < 0) | |
1623 | goto bad_io_barrier; | |
1624 | ||
115485e8 | 1625 | md->numa_node_id = numa_node_id; |
591ddcfc | 1626 | md->init_tio_pdu = false; |
a5664dad | 1627 | md->type = DM_TYPE_NONE; |
e61290a4 | 1628 | mutex_init(&md->suspend_lock); |
a5664dad | 1629 | mutex_init(&md->type_lock); |
86f1152b | 1630 | mutex_init(&md->table_devices_lock); |
022c2611 | 1631 | spin_lock_init(&md->deferred_lock); |
1da177e4 | 1632 | atomic_set(&md->holders, 1); |
5c6bd75d | 1633 | atomic_set(&md->open_count, 0); |
1da177e4 | 1634 | atomic_set(&md->event_nr, 0); |
7a8c3d3b MA |
1635 | atomic_set(&md->uevent_seq, 0); |
1636 | INIT_LIST_HEAD(&md->uevent_list); | |
86f1152b | 1637 | INIT_LIST_HEAD(&md->table_devices); |
7a8c3d3b | 1638 | spin_lock_init(&md->uevent_lock); |
1da177e4 | 1639 | |
47ace7e0 | 1640 | /* |
c62b37d9 CH |
1641 | * default to bio-based until DM table is loaded and md->type |
1642 | * established. If request-based table is loaded: blk-mq will | |
1643 | * override accordingly. | |
47ace7e0 | 1644 | */ |
74fe6ba9 | 1645 | md->disk = blk_alloc_disk(md->numa_node_id); |
1da177e4 | 1646 | if (!md->disk) |
0f20972f | 1647 | goto bad; |
74fe6ba9 | 1648 | md->queue = md->disk->queue; |
1da177e4 | 1649 | |
f0b04115 | 1650 | init_waitqueue_head(&md->wait); |
53d5914f | 1651 | INIT_WORK(&md->work, dm_wq_work); |
f0b04115 | 1652 | init_waitqueue_head(&md->eventq); |
2995fa78 | 1653 | init_completion(&md->kobj_holder.completion); |
f0b04115 | 1654 | |
a666e5c0 MP |
1655 | md->swap_bios = get_swap_bios(); |
1656 | sema_init(&md->swap_bios_semaphore, md->swap_bios); | |
1657 | mutex_init(&md->swap_bios_lock); | |
1658 | ||
1da177e4 LT |
1659 | md->disk->major = _major; |
1660 | md->disk->first_minor = minor; | |
74fe6ba9 | 1661 | md->disk->minors = 1; |
1ebe2e5f | 1662 | md->disk->flags |= GENHD_FL_NO_PART; |
1da177e4 LT |
1663 | md->disk->fops = &dm_blk_dops; |
1664 | md->disk->queue = md->queue; | |
1665 | md->disk->private_data = md; | |
1666 | sprintf(md->disk->disk_name, "dm-%d", minor); | |
f26c5719 | 1667 | |
5d2a228b | 1668 | if (IS_ENABLED(CONFIG_FS_DAX)) { |
30c6828a | 1669 | md->dax_dev = alloc_dax(md, &dm_dax_ops); |
d7519392 CH |
1670 | if (IS_ERR(md->dax_dev)) { |
1671 | md->dax_dev = NULL; | |
976431b0 | 1672 | goto bad; |
d7519392 | 1673 | } |
7ac5360c CH |
1674 | set_dax_nocache(md->dax_dev); |
1675 | set_dax_nomc(md->dax_dev); | |
fb08a190 | 1676 | if (dax_add_host(md->dax_dev, md->disk)) |
976431b0 DW |
1677 | goto bad; |
1678 | } | |
f26c5719 | 1679 | |
7e51f257 | 1680 | format_dev_t(md->name, MKDEV(_major, minor)); |
1da177e4 | 1681 | |
c7c879ee | 1682 | md->wq = alloc_workqueue("kdmflush/%s", WQ_MEM_RECLAIM, 0, md->name); |
304f3f6a | 1683 | if (!md->wq) |
0f20972f | 1684 | goto bad; |
304f3f6a | 1685 | |
9f6dc633 MS |
1686 | md->pending_io = alloc_percpu(unsigned long); |
1687 | if (!md->pending_io) | |
1688 | goto bad; | |
1689 | ||
fd2ed4d2 MP |
1690 | dm_stats_init(&md->stats); |
1691 | ||
ba61fdd1 | 1692 | /* Populate the mapping, nobody knows we exist yet */ |
f32c10b0 | 1693 | spin_lock(&_minor_lock); |
ba61fdd1 | 1694 | old_md = idr_replace(&_minor_idr, md, minor); |
f32c10b0 | 1695 | spin_unlock(&_minor_lock); |
ba61fdd1 JM |
1696 | |
1697 | BUG_ON(old_md != MINOR_ALLOCED); | |
1698 | ||
1da177e4 LT |
1699 | return md; |
1700 | ||
0f20972f MS |
1701 | bad: |
1702 | cleanup_mapped_device(md); | |
83d5e5b0 | 1703 | bad_io_barrier: |
1da177e4 | 1704 | free_minor(minor); |
6ed7ade8 | 1705 | bad_minor: |
10da4f79 | 1706 | module_put(THIS_MODULE); |
6ed7ade8 | 1707 | bad_module_get: |
856eb091 | 1708 | kvfree(md); |
1da177e4 LT |
1709 | return NULL; |
1710 | } | |
1711 | ||
ae9da83f JN |
1712 | static void unlock_fs(struct mapped_device *md); |
1713 | ||
1da177e4 LT |
1714 | static void free_dev(struct mapped_device *md) |
1715 | { | |
f331c029 | 1716 | int minor = MINOR(disk_devt(md->disk)); |
63d94e48 | 1717 | |
32a926da | 1718 | unlock_fs(md); |
2eb6e1e3 | 1719 | |
0f20972f | 1720 | cleanup_mapped_device(md); |
63a4f065 | 1721 | |
86f1152b | 1722 | free_table_devices(&md->table_devices); |
63a4f065 | 1723 | dm_stats_cleanup(&md->stats); |
63a4f065 MS |
1724 | free_minor(minor); |
1725 | ||
10da4f79 | 1726 | module_put(THIS_MODULE); |
856eb091 | 1727 | kvfree(md); |
1da177e4 LT |
1728 | } |
1729 | ||
2a2a4c51 | 1730 | static int __bind_mempools(struct mapped_device *md, struct dm_table *t) |
e6ee8c0b | 1731 | { |
c0820cf5 | 1732 | struct dm_md_mempools *p = dm_table_get_md_mempools(t); |
2a2a4c51 | 1733 | int ret = 0; |
e6ee8c0b | 1734 | |
0776aa0e | 1735 | if (dm_table_bio_based(t)) { |
64f52b0e MS |
1736 | /* |
1737 | * The md may already have mempools that need changing. | |
1738 | * If so, reload bioset because front_pad may have changed | |
1739 | * because a different table was loaded. | |
1740 | */ | |
6f1c819c KO |
1741 | bioset_exit(&md->bs); |
1742 | bioset_exit(&md->io_bs); | |
0776aa0e | 1743 | |
6f1c819c | 1744 | } else if (bioset_initialized(&md->bs)) { |
4e6e36c3 MS |
1745 | /* |
1746 | * There's no need to reload with request-based dm | |
1747 | * because the size of front_pad doesn't change. | |
1748 | * Note for future: If you are to reload bioset, | |
1749 | * prep-ed requests in the queue may refer | |
1750 | * to bio from the old bioset, so you must walk | |
1751 | * through the queue to unprep. | |
1752 | */ | |
1753 | goto out; | |
c0820cf5 | 1754 | } |
e6ee8c0b | 1755 | |
6f1c819c KO |
1756 | BUG_ON(!p || |
1757 | bioset_initialized(&md->bs) || | |
1758 | bioset_initialized(&md->io_bs)); | |
cbc4e3c1 | 1759 | |
2a2a4c51 JA |
1760 | ret = bioset_init_from_src(&md->bs, &p->bs); |
1761 | if (ret) | |
1762 | goto out; | |
1763 | ret = bioset_init_from_src(&md->io_bs, &p->io_bs); | |
1764 | if (ret) | |
1765 | bioset_exit(&md->bs); | |
e6ee8c0b | 1766 | out: |
02233342 | 1767 | /* mempool bind completed, no longer need any mempools in the table */ |
e6ee8c0b | 1768 | dm_table_free_md_mempools(t); |
2a2a4c51 | 1769 | return ret; |
e6ee8c0b KU |
1770 | } |
1771 | ||
1da177e4 LT |
1772 | /* |
1773 | * Bind a table to the device. | |
1774 | */ | |
1775 | static void event_callback(void *context) | |
1776 | { | |
7a8c3d3b MA |
1777 | unsigned long flags; |
1778 | LIST_HEAD(uevents); | |
1da177e4 LT |
1779 | struct mapped_device *md = (struct mapped_device *) context; |
1780 | ||
7a8c3d3b MA |
1781 | spin_lock_irqsave(&md->uevent_lock, flags); |
1782 | list_splice_init(&md->uevent_list, &uevents); | |
1783 | spin_unlock_irqrestore(&md->uevent_lock, flags); | |
1784 | ||
ed9e1982 | 1785 | dm_send_uevents(&uevents, &disk_to_dev(md->disk)->kobj); |
7a8c3d3b | 1786 | |
1da177e4 LT |
1787 | atomic_inc(&md->event_nr); |
1788 | wake_up(&md->eventq); | |
62e08243 | 1789 | dm_issue_global_event(); |
1da177e4 LT |
1790 | } |
1791 | ||
042d2a9b AK |
1792 | /* |
1793 | * Returns old map, which caller must destroy. | |
1794 | */ | |
1795 | static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, | |
1796 | struct queue_limits *limits) | |
1da177e4 | 1797 | { |
042d2a9b | 1798 | struct dm_table *old_map; |
165125e1 | 1799 | struct request_queue *q = md->queue; |
978e51ba | 1800 | bool request_based = dm_table_request_based(t); |
1da177e4 | 1801 | sector_t size; |
2a2a4c51 | 1802 | int ret; |
1da177e4 | 1803 | |
5a8f1f80 BVA |
1804 | lockdep_assert_held(&md->suspend_lock); |
1805 | ||
1da177e4 | 1806 | size = dm_table_get_size(t); |
3ac51e74 DW |
1807 | |
1808 | /* | |
1809 | * Wipe any geometry if the size of the table changed. | |
1810 | */ | |
fd2ed4d2 | 1811 | if (size != dm_get_size(md)) |
3ac51e74 DW |
1812 | memset(&md->geometry, 0, sizeof(md->geometry)); |
1813 | ||
5424a0b8 MP |
1814 | if (!get_capacity(md->disk)) |
1815 | set_capacity(md->disk, size); | |
1816 | else | |
1817 | set_capacity_and_notify(md->disk, size); | |
d5816876 | 1818 | |
2ca3310e AK |
1819 | dm_table_event_callback(t, event_callback, md); |
1820 | ||
9c37de29 | 1821 | if (request_based) { |
16f12266 | 1822 | /* |
9c37de29 MS |
1823 | * Leverage the fact that request-based DM targets are |
1824 | * immutable singletons - used to optimize dm_mq_queue_rq. | |
16f12266 MS |
1825 | */ |
1826 | md->immutable_target = dm_table_get_immutable_target(t); | |
1827 | } | |
e6ee8c0b | 1828 | |
2a2a4c51 JA |
1829 | ret = __bind_mempools(md, t); |
1830 | if (ret) { | |
1831 | old_map = ERR_PTR(ret); | |
1832 | goto out; | |
1833 | } | |
e6ee8c0b | 1834 | |
bb37d772 DLM |
1835 | ret = dm_table_set_restrictions(t, q, limits); |
1836 | if (ret) { | |
1837 | old_map = ERR_PTR(ret); | |
1838 | goto out; | |
1839 | } | |
1840 | ||
a12f5d48 | 1841 | old_map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
1d3aa6f6 | 1842 | rcu_assign_pointer(md->map, (void *)t); |
36a0456f AK |
1843 | md->immutable_target_type = dm_table_get_immutable_target_type(t); |
1844 | ||
41abc4e1 HR |
1845 | if (old_map) |
1846 | dm_sync_table(md); | |
1da177e4 | 1847 | |
2a2a4c51 | 1848 | out: |
042d2a9b | 1849 | return old_map; |
1da177e4 LT |
1850 | } |
1851 | ||
a7940155 AK |
1852 | /* |
1853 | * Returns unbound table for the caller to free. | |
1854 | */ | |
1855 | static struct dm_table *__unbind(struct mapped_device *md) | |
1da177e4 | 1856 | { |
a12f5d48 | 1857 | struct dm_table *map = rcu_dereference_protected(md->map, 1); |
1da177e4 LT |
1858 | |
1859 | if (!map) | |
a7940155 | 1860 | return NULL; |
1da177e4 LT |
1861 | |
1862 | dm_table_event_callback(map, NULL, NULL); | |
9cdb8520 | 1863 | RCU_INIT_POINTER(md->map, NULL); |
83d5e5b0 | 1864 | dm_sync_table(md); |
a7940155 AK |
1865 | |
1866 | return map; | |
1da177e4 LT |
1867 | } |
1868 | ||
1869 | /* | |
1870 | * Constructor for a new device. | |
1871 | */ | |
2b06cfff | 1872 | int dm_create(int minor, struct mapped_device **result) |
1da177e4 LT |
1873 | { |
1874 | struct mapped_device *md; | |
1875 | ||
2b06cfff | 1876 | md = alloc_dev(minor); |
1da177e4 LT |
1877 | if (!md) |
1878 | return -ENXIO; | |
1879 | ||
91ccbbac TS |
1880 | dm_ima_reset_data(md); |
1881 | ||
1da177e4 LT |
1882 | *result = md; |
1883 | return 0; | |
1884 | } | |
1885 | ||
a5664dad MS |
1886 | /* |
1887 | * Functions to manage md->type. | |
1888 | * All are required to hold md->type_lock. | |
1889 | */ | |
1890 | void dm_lock_md_type(struct mapped_device *md) | |
1891 | { | |
1892 | mutex_lock(&md->type_lock); | |
1893 | } | |
1894 | ||
1895 | void dm_unlock_md_type(struct mapped_device *md) | |
1896 | { | |
1897 | mutex_unlock(&md->type_lock); | |
1898 | } | |
1899 | ||
7e0d574f | 1900 | void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type) |
a5664dad | 1901 | { |
00c4fc3b | 1902 | BUG_ON(!mutex_is_locked(&md->type_lock)); |
a5664dad MS |
1903 | md->type = type; |
1904 | } | |
1905 | ||
7e0d574f | 1906 | enum dm_queue_mode dm_get_md_type(struct mapped_device *md) |
a5664dad MS |
1907 | { |
1908 | return md->type; | |
1909 | } | |
1910 | ||
36a0456f AK |
1911 | struct target_type *dm_get_immutable_target_type(struct mapped_device *md) |
1912 | { | |
1913 | return md->immutable_target_type; | |
1914 | } | |
1915 | ||
f84cb8a4 MS |
1916 | /* |
1917 | * The queue_limits are only valid as long as you have a reference | |
1918 | * count on 'md'. | |
1919 | */ | |
1920 | struct queue_limits *dm_get_queue_limits(struct mapped_device *md) | |
1921 | { | |
1922 | BUG_ON(!atomic_read(&md->holders)); | |
1923 | return &md->queue->limits; | |
1924 | } | |
1925 | EXPORT_SYMBOL_GPL(dm_get_queue_limits); | |
1926 | ||
4a0b4ddf MS |
1927 | /* |
1928 | * Setup the DM device's queue based on md's type | |
1929 | */ | |
591ddcfc | 1930 | int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t) |
4a0b4ddf | 1931 | { |
ba305859 | 1932 | enum dm_queue_mode type = dm_table_get_type(t); |
c100ec49 | 1933 | struct queue_limits limits; |
ba305859 | 1934 | int r; |
bfebd1cd | 1935 | |
545ed20e | 1936 | switch (type) { |
bfebd1cd | 1937 | case DM_TYPE_REQUEST_BASED: |
681cc5e8 | 1938 | md->disk->fops = &dm_rq_blk_dops; |
e83068a5 | 1939 | r = dm_mq_init_request_queue(md, t); |
bfebd1cd | 1940 | if (r) { |
681cc5e8 | 1941 | DMERR("Cannot initialize queue for request-based dm mapped device"); |
bfebd1cd MS |
1942 | return r; |
1943 | } | |
1944 | break; | |
1945 | case DM_TYPE_BIO_BASED: | |
545ed20e | 1946 | case DM_TYPE_DAX_BIO_BASED: |
bfebd1cd | 1947 | break; |
7e0d574f BVA |
1948 | case DM_TYPE_NONE: |
1949 | WARN_ON_ONCE(true); | |
1950 | break; | |
4a0b4ddf MS |
1951 | } |
1952 | ||
c100ec49 MS |
1953 | r = dm_calculate_queue_limits(t, &limits); |
1954 | if (r) { | |
1955 | DMERR("Cannot calculate initial queue limits"); | |
1956 | return r; | |
1957 | } | |
bb37d772 DLM |
1958 | r = dm_table_set_restrictions(t, md->queue, &limits); |
1959 | if (r) | |
1960 | return r; | |
1961 | ||
e7089f65 LC |
1962 | r = add_disk(md->disk); |
1963 | if (r) | |
1964 | return r; | |
c100ec49 | 1965 | |
89f871af CH |
1966 | r = dm_sysfs_init(md); |
1967 | if (r) { | |
1968 | del_gendisk(md->disk); | |
1969 | return r; | |
1970 | } | |
1971 | md->type = type; | |
4a0b4ddf MS |
1972 | return 0; |
1973 | } | |
1974 | ||
2bec1f4a | 1975 | struct mapped_device *dm_get_md(dev_t dev) |
1da177e4 LT |
1976 | { |
1977 | struct mapped_device *md; | |
1da177e4 LT |
1978 | unsigned minor = MINOR(dev); |
1979 | ||
1980 | if (MAJOR(dev) != _major || minor >= (1 << MINORBITS)) | |
1981 | return NULL; | |
1982 | ||
f32c10b0 | 1983 | spin_lock(&_minor_lock); |
1da177e4 LT |
1984 | |
1985 | md = idr_find(&_minor_idr, minor); | |
49de5769 MS |
1986 | if (!md || md == MINOR_ALLOCED || (MINOR(disk_devt(dm_disk(md))) != minor) || |
1987 | test_bit(DMF_FREEING, &md->flags) || dm_deleting_md(md)) { | |
1988 | md = NULL; | |
1989 | goto out; | |
fba9f90e | 1990 | } |
49de5769 | 1991 | dm_get(md); |
fba9f90e | 1992 | out: |
f32c10b0 | 1993 | spin_unlock(&_minor_lock); |
1da177e4 | 1994 | |
637842cf DT |
1995 | return md; |
1996 | } | |
3cf2e4ba | 1997 | EXPORT_SYMBOL_GPL(dm_get_md); |
d229a958 | 1998 | |
9ade92a9 | 1999 | void *dm_get_mdptr(struct mapped_device *md) |
637842cf | 2000 | { |
9ade92a9 | 2001 | return md->interface_ptr; |
1da177e4 LT |
2002 | } |
2003 | ||
2004 | void dm_set_mdptr(struct mapped_device *md, void *ptr) | |
2005 | { | |
2006 | md->interface_ptr = ptr; | |
2007 | } | |
2008 | ||
2009 | void dm_get(struct mapped_device *md) | |
2010 | { | |
2011 | atomic_inc(&md->holders); | |
3f77316d | 2012 | BUG_ON(test_bit(DMF_FREEING, &md->flags)); |
1da177e4 LT |
2013 | } |
2014 | ||
09ee96b2 MP |
2015 | int dm_hold(struct mapped_device *md) |
2016 | { | |
2017 | spin_lock(&_minor_lock); | |
2018 | if (test_bit(DMF_FREEING, &md->flags)) { | |
2019 | spin_unlock(&_minor_lock); | |
2020 | return -EBUSY; | |
2021 | } | |
2022 | dm_get(md); | |
2023 | spin_unlock(&_minor_lock); | |
2024 | return 0; | |
2025 | } | |
2026 | EXPORT_SYMBOL_GPL(dm_hold); | |
2027 | ||
72d94861 AK |
2028 | const char *dm_device_name(struct mapped_device *md) |
2029 | { | |
2030 | return md->name; | |
2031 | } | |
2032 | EXPORT_SYMBOL_GPL(dm_device_name); | |
2033 | ||
3f77316d | 2034 | static void __dm_destroy(struct mapped_device *md, bool wait) |
1da177e4 | 2035 | { |
1134e5ae | 2036 | struct dm_table *map; |
83d5e5b0 | 2037 | int srcu_idx; |
1da177e4 | 2038 | |
3f77316d | 2039 | might_sleep(); |
fba9f90e | 2040 | |
63a4f065 | 2041 | spin_lock(&_minor_lock); |
3f77316d KU |
2042 | idr_replace(&_minor_idr, MINOR_ALLOCED, MINOR(disk_devt(dm_disk(md)))); |
2043 | set_bit(DMF_FREEING, &md->flags); | |
2044 | spin_unlock(&_minor_lock); | |
3b785fbc | 2045 | |
c12c9a3c | 2046 | blk_set_queue_dying(md->queue); |
3f77316d | 2047 | |
ab7c7bb6 MP |
2048 | /* |
2049 | * Take suspend_lock so that presuspend and postsuspend methods | |
2050 | * do not race with internal suspend. | |
2051 | */ | |
2052 | mutex_lock(&md->suspend_lock); | |
2a708cff | 2053 | map = dm_get_live_table(md, &srcu_idx); |
3f77316d KU |
2054 | if (!dm_suspended_md(md)) { |
2055 | dm_table_presuspend_targets(map); | |
adc0daad | 2056 | set_bit(DMF_SUSPENDED, &md->flags); |
5df96f2b | 2057 | set_bit(DMF_POST_SUSPENDING, &md->flags); |
3f77316d | 2058 | dm_table_postsuspend_targets(map); |
1da177e4 | 2059 | } |
83d5e5b0 MP |
2060 | /* dm_put_live_table must be before msleep, otherwise deadlock is possible */ |
2061 | dm_put_live_table(md, srcu_idx); | |
2a708cff | 2062 | mutex_unlock(&md->suspend_lock); |
83d5e5b0 | 2063 | |
3f77316d KU |
2064 | /* |
2065 | * Rare, but there may be I/O requests still going to complete, | |
2066 | * for example. Wait for all references to disappear. | |
2067 | * No one should increment the reference count of the mapped_device, | |
2068 | * after the mapped_device state becomes DMF_FREEING. | |
2069 | */ | |
2070 | if (wait) | |
2071 | while (atomic_read(&md->holders)) | |
2072 | msleep(1); | |
2073 | else if (atomic_read(&md->holders)) | |
2074 | DMWARN("%s: Forcibly removing mapped_device still in use! (%d users)", | |
2075 | dm_device_name(md), atomic_read(&md->holders)); | |
2076 | ||
3f77316d KU |
2077 | dm_table_destroy(__unbind(md)); |
2078 | free_dev(md); | |
2079 | } | |
2080 | ||
2081 | void dm_destroy(struct mapped_device *md) | |
2082 | { | |
2083 | __dm_destroy(md, true); | |
2084 | } | |
2085 | ||
2086 | void dm_destroy_immediate(struct mapped_device *md) | |
2087 | { | |
2088 | __dm_destroy(md, false); | |
2089 | } | |
2090 | ||
2091 | void dm_put(struct mapped_device *md) | |
2092 | { | |
2093 | atomic_dec(&md->holders); | |
1da177e4 | 2094 | } |
79eb885c | 2095 | EXPORT_SYMBOL_GPL(dm_put); |
1da177e4 | 2096 | |
9f6dc633 | 2097 | static bool dm_in_flight_bios(struct mapped_device *md) |
85067747 ML |
2098 | { |
2099 | int cpu; | |
9f6dc633 | 2100 | unsigned long sum = 0; |
85067747 | 2101 | |
9f6dc633 MS |
2102 | for_each_possible_cpu(cpu) |
2103 | sum += *per_cpu_ptr(md->pending_io, cpu); | |
85067747 ML |
2104 | |
2105 | return sum != 0; | |
2106 | } | |
2107 | ||
2f064a59 | 2108 | static int dm_wait_for_bios_completion(struct mapped_device *md, unsigned int task_state) |
46125c1c MB |
2109 | { |
2110 | int r = 0; | |
9f4c3f87 | 2111 | DEFINE_WAIT(wait); |
46125c1c | 2112 | |
85067747 | 2113 | while (true) { |
9f4c3f87 | 2114 | prepare_to_wait(&md->wait, &wait, task_state); |
46125c1c | 2115 | |
9f6dc633 | 2116 | if (!dm_in_flight_bios(md)) |
46125c1c MB |
2117 | break; |
2118 | ||
e3fabdfd | 2119 | if (signal_pending_state(task_state, current)) { |
46125c1c MB |
2120 | r = -EINTR; |
2121 | break; | |
2122 | } | |
2123 | ||
2124 | io_schedule(); | |
2125 | } | |
9f4c3f87 | 2126 | finish_wait(&md->wait, &wait); |
b44ebeb0 | 2127 | |
9f6dc633 MS |
2128 | smp_rmb(); |
2129 | ||
46125c1c MB |
2130 | return r; |
2131 | } | |
2132 | ||
2f064a59 | 2133 | static int dm_wait_for_completion(struct mapped_device *md, unsigned int task_state) |
85067747 ML |
2134 | { |
2135 | int r = 0; | |
2136 | ||
2137 | if (!queue_is_mq(md->queue)) | |
2138 | return dm_wait_for_bios_completion(md, task_state); | |
2139 | ||
2140 | while (true) { | |
2141 | if (!blk_mq_queue_inflight(md->queue)) | |
2142 | break; | |
2143 | ||
2144 | if (signal_pending_state(task_state, current)) { | |
2145 | r = -EINTR; | |
2146 | break; | |
2147 | } | |
2148 | ||
2149 | msleep(5); | |
2150 | } | |
2151 | ||
2152 | return r; | |
2153 | } | |
2154 | ||
1da177e4 LT |
2155 | /* |
2156 | * Process the deferred bios | |
2157 | */ | |
ef208587 | 2158 | static void dm_wq_work(struct work_struct *work) |
1da177e4 | 2159 | { |
0c2915b8 MS |
2160 | struct mapped_device *md = container_of(work, struct mapped_device, work); |
2161 | struct bio *bio; | |
ef208587 | 2162 | |
3b00b203 | 2163 | while (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) { |
df12ee99 | 2164 | spin_lock_irq(&md->deferred_lock); |
0c2915b8 | 2165 | bio = bio_list_pop(&md->deferred); |
df12ee99 AK |
2166 | spin_unlock_irq(&md->deferred_lock); |
2167 | ||
0c2915b8 | 2168 | if (!bio) |
df12ee99 | 2169 | break; |
022c2611 | 2170 | |
0c2915b8 | 2171 | submit_bio_noacct(bio); |
022c2611 | 2172 | } |
1da177e4 LT |
2173 | } |
2174 | ||
9a1fb464 | 2175 | static void dm_queue_flush(struct mapped_device *md) |
304f3f6a | 2176 | { |
3b00b203 | 2177 | clear_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
4e857c58 | 2178 | smp_mb__after_atomic(); |
53d5914f | 2179 | queue_work(md->wq, &md->work); |
304f3f6a MB |
2180 | } |
2181 | ||
1da177e4 | 2182 | /* |
042d2a9b | 2183 | * Swap in a new table, returning the old one for the caller to destroy. |
1da177e4 | 2184 | */ |
042d2a9b | 2185 | struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table) |
1da177e4 | 2186 | { |
87eb5b21 | 2187 | struct dm_table *live_map = NULL, *map = ERR_PTR(-EINVAL); |
754c5fc7 | 2188 | struct queue_limits limits; |
042d2a9b | 2189 | int r; |
1da177e4 | 2190 | |
e61290a4 | 2191 | mutex_lock(&md->suspend_lock); |
1da177e4 LT |
2192 | |
2193 | /* device must be suspended */ | |
4f186f8b | 2194 | if (!dm_suspended_md(md)) |
93c534ae | 2195 | goto out; |
1da177e4 | 2196 | |
3ae70656 MS |
2197 | /* |
2198 | * If the new table has no data devices, retain the existing limits. | |
2199 | * This helps multipath with queue_if_no_path if all paths disappear, | |
2200 | * then new I/O is queued based on these limits, and then some paths | |
2201 | * reappear. | |
2202 | */ | |
2203 | if (dm_table_has_no_data_devices(table)) { | |
83d5e5b0 | 2204 | live_map = dm_get_live_table_fast(md); |
3ae70656 MS |
2205 | if (live_map) |
2206 | limits = md->queue->limits; | |
83d5e5b0 | 2207 | dm_put_live_table_fast(md); |
3ae70656 MS |
2208 | } |
2209 | ||
87eb5b21 MC |
2210 | if (!live_map) { |
2211 | r = dm_calculate_queue_limits(table, &limits); | |
2212 | if (r) { | |
2213 | map = ERR_PTR(r); | |
2214 | goto out; | |
2215 | } | |
042d2a9b | 2216 | } |
754c5fc7 | 2217 | |
042d2a9b | 2218 | map = __bind(md, table, &limits); |
62e08243 | 2219 | dm_issue_global_event(); |
1da177e4 | 2220 | |
93c534ae | 2221 | out: |
e61290a4 | 2222 | mutex_unlock(&md->suspend_lock); |
042d2a9b | 2223 | return map; |
1da177e4 LT |
2224 | } |
2225 | ||
2226 | /* | |
2227 | * Functions to lock and unlock any filesystem running on the | |
2228 | * device. | |
2229 | */ | |
2ca3310e | 2230 | static int lock_fs(struct mapped_device *md) |
1da177e4 | 2231 | { |
e39e2e95 | 2232 | int r; |
1da177e4 | 2233 | |
040f04bd | 2234 | WARN_ON(test_bit(DMF_FROZEN, &md->flags)); |
aa8d7c2f | 2235 | |
977115c0 | 2236 | r = freeze_bdev(md->disk->part0); |
040f04bd CH |
2237 | if (!r) |
2238 | set_bit(DMF_FROZEN, &md->flags); | |
2239 | return r; | |
1da177e4 LT |
2240 | } |
2241 | ||
2ca3310e | 2242 | static void unlock_fs(struct mapped_device *md) |
1da177e4 | 2243 | { |
aa8d7c2f AK |
2244 | if (!test_bit(DMF_FROZEN, &md->flags)) |
2245 | return; | |
977115c0 | 2246 | thaw_bdev(md->disk->part0); |
aa8d7c2f | 2247 | clear_bit(DMF_FROZEN, &md->flags); |
1da177e4 LT |
2248 | } |
2249 | ||
2250 | /* | |
b48633f8 BVA |
2251 | * @suspend_flags: DM_SUSPEND_LOCKFS_FLAG and/or DM_SUSPEND_NOFLUSH_FLAG |
2252 | * @task_state: e.g. TASK_INTERRUPTIBLE or TASK_UNINTERRUPTIBLE | |
2253 | * @dmf_suspended_flag: DMF_SUSPENDED or DMF_SUSPENDED_INTERNALLY | |
2254 | * | |
ffcc3936 MS |
2255 | * If __dm_suspend returns 0, the device is completely quiescent |
2256 | * now. There is no request-processing activity. All new requests | |
2257 | * are being added to md->deferred list. | |
cec47e3d | 2258 | */ |
ffcc3936 | 2259 | static int __dm_suspend(struct mapped_device *md, struct dm_table *map, |
2f064a59 | 2260 | unsigned suspend_flags, unsigned int task_state, |
eaf9a736 | 2261 | int dmf_suspended_flag) |
1da177e4 | 2262 | { |
ffcc3936 MS |
2263 | bool do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG; |
2264 | bool noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG; | |
2265 | int r; | |
1da177e4 | 2266 | |
5a8f1f80 BVA |
2267 | lockdep_assert_held(&md->suspend_lock); |
2268 | ||
2e93ccc1 KU |
2269 | /* |
2270 | * DMF_NOFLUSH_SUSPENDING must be set before presuspend. | |
2271 | * This flag is cleared before dm_suspend returns. | |
2272 | */ | |
2273 | if (noflush) | |
2274 | set_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); | |
86331f39 | 2275 | else |
ac75b09f | 2276 | DMDEBUG("%s: suspending with flush", dm_device_name(md)); |
2e93ccc1 | 2277 | |
d67ee213 MS |
2278 | /* |
2279 | * This gets reverted if there's an error later and the targets | |
2280 | * provide the .presuspend_undo hook. | |
2281 | */ | |
cf222b37 AK |
2282 | dm_table_presuspend_targets(map); |
2283 | ||
32a926da | 2284 | /* |
9f518b27 KU |
2285 | * Flush I/O to the device. |
2286 | * Any I/O submitted after lock_fs() may not be flushed. | |
2287 | * noflush takes precedence over do_lockfs. | |
2288 | * (lock_fs() flushes I/Os and waits for them to complete.) | |
32a926da MP |
2289 | */ |
2290 | if (!noflush && do_lockfs) { | |
2291 | r = lock_fs(md); | |
d67ee213 MS |
2292 | if (r) { |
2293 | dm_table_presuspend_undo_targets(map); | |
ffcc3936 | 2294 | return r; |
d67ee213 | 2295 | } |
aa8d7c2f | 2296 | } |
1da177e4 LT |
2297 | |
2298 | /* | |
3b00b203 MP |
2299 | * Here we must make sure that no processes are submitting requests |
2300 | * to target drivers i.e. no one may be executing | |
96c9865c | 2301 | * dm_split_and_process_bio from dm_submit_bio. |
3b00b203 | 2302 | * |
96c9865c | 2303 | * To get all processes out of dm_split_and_process_bio in dm_submit_bio, |
3b00b203 | 2304 | * we take the write lock. To prevent any process from reentering |
96c9865c | 2305 | * dm_split_and_process_bio from dm_submit_bio and quiesce the thread |
0cede372 | 2306 | * (dm_wq_work), we set DMF_BLOCK_IO_FOR_SUSPEND and call |
6a8736d1 | 2307 | * flush_workqueue(md->wq). |
1da177e4 | 2308 | */ |
1eb787ec | 2309 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
41abc4e1 HR |
2310 | if (map) |
2311 | synchronize_srcu(&md->io_barrier); | |
1da177e4 | 2312 | |
d0bcb878 | 2313 | /* |
29e4013d TH |
2314 | * Stop md->queue before flushing md->wq in case request-based |
2315 | * dm defers requests to md->wq from md->queue. | |
d0bcb878 | 2316 | */ |
6a23e05c | 2317 | if (dm_request_based(md)) |
eca7ee6d | 2318 | dm_stop_queue(md->queue); |
cec47e3d | 2319 | |
d0bcb878 KU |
2320 | flush_workqueue(md->wq); |
2321 | ||
1da177e4 | 2322 | /* |
3b00b203 MP |
2323 | * At this point no more requests are entering target request routines. |
2324 | * We call dm_wait_for_completion to wait for all existing requests | |
2325 | * to finish. | |
1da177e4 | 2326 | */ |
b48633f8 | 2327 | r = dm_wait_for_completion(md, task_state); |
eaf9a736 MS |
2328 | if (!r) |
2329 | set_bit(dmf_suspended_flag, &md->flags); | |
1da177e4 | 2330 | |
6d6f10df | 2331 | if (noflush) |
022c2611 | 2332 | clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); |
41abc4e1 HR |
2333 | if (map) |
2334 | synchronize_srcu(&md->io_barrier); | |
2e93ccc1 | 2335 | |
1da177e4 | 2336 | /* were we interrupted ? */ |
46125c1c | 2337 | if (r < 0) { |
9a1fb464 | 2338 | dm_queue_flush(md); |
73d410c0 | 2339 | |
cec47e3d | 2340 | if (dm_request_based(md)) |
eca7ee6d | 2341 | dm_start_queue(md->queue); |
cec47e3d | 2342 | |
2ca3310e | 2343 | unlock_fs(md); |
d67ee213 | 2344 | dm_table_presuspend_undo_targets(map); |
ffcc3936 | 2345 | /* pushback list is already flushed, so skip flush */ |
2ca3310e | 2346 | } |
1da177e4 | 2347 | |
ffcc3936 MS |
2348 | return r; |
2349 | } | |
2350 | ||
2351 | /* | |
2352 | * We need to be able to change a mapping table under a mounted | |
2353 | * filesystem. For example we might want to move some data in | |
2354 | * the background. Before the table can be swapped with | |
2355 | * dm_bind_table, dm_suspend must be called to flush any in | |
2356 | * flight bios and ensure that any further io gets deferred. | |
2357 | */ | |
2358 | /* | |
2359 | * Suspend mechanism in request-based dm. | |
2360 | * | |
2361 | * 1. Flush all I/Os by lock_fs() if needed. | |
2362 | * 2. Stop dispatching any I/O by stopping the request_queue. | |
2363 | * 3. Wait for all in-flight I/Os to be completed or requeued. | |
2364 | * | |
2365 | * To abort suspend, start the request_queue. | |
2366 | */ | |
2367 | int dm_suspend(struct mapped_device *md, unsigned suspend_flags) | |
2368 | { | |
2369 | struct dm_table *map = NULL; | |
2370 | int r = 0; | |
2371 | ||
2372 | retry: | |
2373 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); | |
2374 | ||
2375 | if (dm_suspended_md(md)) { | |
2376 | r = -EINVAL; | |
2377 | goto out_unlock; | |
2378 | } | |
2379 | ||
2380 | if (dm_suspended_internally_md(md)) { | |
2381 | /* already internally suspended, wait for internal resume */ | |
2382 | mutex_unlock(&md->suspend_lock); | |
2383 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); | |
2384 | if (r) | |
2385 | return r; | |
2386 | goto retry; | |
2387 | } | |
2388 | ||
a12f5d48 | 2389 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
ffcc3936 | 2390 | |
eaf9a736 | 2391 | r = __dm_suspend(md, map, suspend_flags, TASK_INTERRUPTIBLE, DMF_SUSPENDED); |
ffcc3936 MS |
2392 | if (r) |
2393 | goto out_unlock; | |
3b00b203 | 2394 | |
5df96f2b | 2395 | set_bit(DMF_POST_SUSPENDING, &md->flags); |
4d4471cb | 2396 | dm_table_postsuspend_targets(map); |
5df96f2b | 2397 | clear_bit(DMF_POST_SUSPENDING, &md->flags); |
4d4471cb | 2398 | |
d287483d | 2399 | out_unlock: |
e61290a4 | 2400 | mutex_unlock(&md->suspend_lock); |
cf222b37 | 2401 | return r; |
1da177e4 LT |
2402 | } |
2403 | ||
ffcc3936 MS |
2404 | static int __dm_resume(struct mapped_device *md, struct dm_table *map) |
2405 | { | |
2406 | if (map) { | |
2407 | int r = dm_table_resume_targets(map); | |
2408 | if (r) | |
2409 | return r; | |
2410 | } | |
2411 | ||
2412 | dm_queue_flush(md); | |
2413 | ||
2414 | /* | |
2415 | * Flushing deferred I/Os must be done after targets are resumed | |
2416 | * so that mapping of targets can work correctly. | |
2417 | * Request-based dm is queueing the deferred I/Os in its request_queue. | |
2418 | */ | |
2419 | if (dm_request_based(md)) | |
eca7ee6d | 2420 | dm_start_queue(md->queue); |
ffcc3936 MS |
2421 | |
2422 | unlock_fs(md); | |
2423 | ||
2424 | return 0; | |
2425 | } | |
2426 | ||
1da177e4 LT |
2427 | int dm_resume(struct mapped_device *md) |
2428 | { | |
8dc23658 | 2429 | int r; |
cf222b37 | 2430 | struct dm_table *map = NULL; |
1da177e4 | 2431 | |
ffcc3936 | 2432 | retry: |
8dc23658 | 2433 | r = -EINVAL; |
ffcc3936 MS |
2434 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); |
2435 | ||
4f186f8b | 2436 | if (!dm_suspended_md(md)) |
cf222b37 | 2437 | goto out; |
cf222b37 | 2438 | |
ffcc3936 MS |
2439 | if (dm_suspended_internally_md(md)) { |
2440 | /* already internally suspended, wait for internal resume */ | |
2441 | mutex_unlock(&md->suspend_lock); | |
2442 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); | |
2443 | if (r) | |
2444 | return r; | |
2445 | goto retry; | |
2446 | } | |
2447 | ||
a12f5d48 | 2448 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
2ca3310e | 2449 | if (!map || !dm_table_get_size(map)) |
cf222b37 | 2450 | goto out; |
1da177e4 | 2451 | |
ffcc3936 | 2452 | r = __dm_resume(md, map); |
8757b776 MB |
2453 | if (r) |
2454 | goto out; | |
2ca3310e | 2455 | |
2ca3310e | 2456 | clear_bit(DMF_SUSPENDED, &md->flags); |
cf222b37 | 2457 | out: |
e61290a4 | 2458 | mutex_unlock(&md->suspend_lock); |
2ca3310e | 2459 | |
cf222b37 | 2460 | return r; |
1da177e4 LT |
2461 | } |
2462 | ||
fd2ed4d2 MP |
2463 | /* |
2464 | * Internal suspend/resume works like userspace-driven suspend. It waits | |
2465 | * until all bios finish and prevents issuing new bios to the target drivers. | |
2466 | * It may be used only from the kernel. | |
fd2ed4d2 MP |
2467 | */ |
2468 | ||
ffcc3936 | 2469 | static void __dm_internal_suspend(struct mapped_device *md, unsigned suspend_flags) |
fd2ed4d2 | 2470 | { |
ffcc3936 MS |
2471 | struct dm_table *map = NULL; |
2472 | ||
1ea0654e BVA |
2473 | lockdep_assert_held(&md->suspend_lock); |
2474 | ||
96b26c8c | 2475 | if (md->internal_suspend_count++) |
ffcc3936 MS |
2476 | return; /* nested internal suspend */ |
2477 | ||
2478 | if (dm_suspended_md(md)) { | |
2479 | set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2480 | return; /* nest suspend */ | |
2481 | } | |
2482 | ||
a12f5d48 | 2483 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
ffcc3936 MS |
2484 | |
2485 | /* | |
2486 | * Using TASK_UNINTERRUPTIBLE because only NOFLUSH internal suspend is | |
2487 | * supported. Properly supporting a TASK_INTERRUPTIBLE internal suspend | |
2488 | * would require changing .presuspend to return an error -- avoid this | |
2489 | * until there is a need for more elaborate variants of internal suspend. | |
2490 | */ | |
eaf9a736 MS |
2491 | (void) __dm_suspend(md, map, suspend_flags, TASK_UNINTERRUPTIBLE, |
2492 | DMF_SUSPENDED_INTERNALLY); | |
ffcc3936 | 2493 | |
5df96f2b | 2494 | set_bit(DMF_POST_SUSPENDING, &md->flags); |
ffcc3936 | 2495 | dm_table_postsuspend_targets(map); |
5df96f2b | 2496 | clear_bit(DMF_POST_SUSPENDING, &md->flags); |
ffcc3936 MS |
2497 | } |
2498 | ||
2499 | static void __dm_internal_resume(struct mapped_device *md) | |
2500 | { | |
96b26c8c MP |
2501 | BUG_ON(!md->internal_suspend_count); |
2502 | ||
2503 | if (--md->internal_suspend_count) | |
ffcc3936 MS |
2504 | return; /* resume from nested internal suspend */ |
2505 | ||
fd2ed4d2 | 2506 | if (dm_suspended_md(md)) |
ffcc3936 MS |
2507 | goto done; /* resume from nested suspend */ |
2508 | ||
2509 | /* | |
2510 | * NOTE: existing callers don't need to call dm_table_resume_targets | |
2511 | * (which may fail -- so best to avoid it for now by passing NULL map) | |
2512 | */ | |
2513 | (void) __dm_resume(md, NULL); | |
2514 | ||
2515 | done: | |
2516 | clear_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2517 | smp_mb__after_atomic(); | |
2518 | wake_up_bit(&md->flags, DMF_SUSPENDED_INTERNALLY); | |
2519 | } | |
2520 | ||
2521 | void dm_internal_suspend_noflush(struct mapped_device *md) | |
2522 | { | |
2523 | mutex_lock(&md->suspend_lock); | |
2524 | __dm_internal_suspend(md, DM_SUSPEND_NOFLUSH_FLAG); | |
2525 | mutex_unlock(&md->suspend_lock); | |
2526 | } | |
2527 | EXPORT_SYMBOL_GPL(dm_internal_suspend_noflush); | |
2528 | ||
2529 | void dm_internal_resume(struct mapped_device *md) | |
2530 | { | |
2531 | mutex_lock(&md->suspend_lock); | |
2532 | __dm_internal_resume(md); | |
2533 | mutex_unlock(&md->suspend_lock); | |
2534 | } | |
2535 | EXPORT_SYMBOL_GPL(dm_internal_resume); | |
2536 | ||
2537 | /* | |
2538 | * Fast variants of internal suspend/resume hold md->suspend_lock, | |
2539 | * which prevents interaction with userspace-driven suspend. | |
2540 | */ | |
2541 | ||
2542 | void dm_internal_suspend_fast(struct mapped_device *md) | |
2543 | { | |
2544 | mutex_lock(&md->suspend_lock); | |
2545 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) | |
fd2ed4d2 MP |
2546 | return; |
2547 | ||
2548 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); | |
2549 | synchronize_srcu(&md->io_barrier); | |
2550 | flush_workqueue(md->wq); | |
2551 | dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE); | |
2552 | } | |
b735fede | 2553 | EXPORT_SYMBOL_GPL(dm_internal_suspend_fast); |
fd2ed4d2 | 2554 | |
ffcc3936 | 2555 | void dm_internal_resume_fast(struct mapped_device *md) |
fd2ed4d2 | 2556 | { |
ffcc3936 | 2557 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) |
fd2ed4d2 MP |
2558 | goto done; |
2559 | ||
2560 | dm_queue_flush(md); | |
2561 | ||
2562 | done: | |
2563 | mutex_unlock(&md->suspend_lock); | |
2564 | } | |
b735fede | 2565 | EXPORT_SYMBOL_GPL(dm_internal_resume_fast); |
fd2ed4d2 | 2566 | |
1da177e4 LT |
2567 | /*----------------------------------------------------------------- |
2568 | * Event notification. | |
2569 | *---------------------------------------------------------------*/ | |
3abf85b5 | 2570 | int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, |
60935eb2 | 2571 | unsigned cookie) |
69267a30 | 2572 | { |
6958c1c6 MP |
2573 | int r; |
2574 | unsigned noio_flag; | |
60935eb2 MB |
2575 | char udev_cookie[DM_COOKIE_LENGTH]; |
2576 | char *envp[] = { udev_cookie, NULL }; | |
2577 | ||
6958c1c6 MP |
2578 | noio_flag = memalloc_noio_save(); |
2579 | ||
60935eb2 | 2580 | if (!cookie) |
6958c1c6 | 2581 | r = kobject_uevent(&disk_to_dev(md->disk)->kobj, action); |
60935eb2 MB |
2582 | else { |
2583 | snprintf(udev_cookie, DM_COOKIE_LENGTH, "%s=%u", | |
2584 | DM_COOKIE_ENV_VAR_NAME, cookie); | |
6958c1c6 MP |
2585 | r = kobject_uevent_env(&disk_to_dev(md->disk)->kobj, |
2586 | action, envp); | |
60935eb2 | 2587 | } |
6958c1c6 MP |
2588 | |
2589 | memalloc_noio_restore(noio_flag); | |
2590 | ||
2591 | return r; | |
69267a30 AK |
2592 | } |
2593 | ||
7a8c3d3b MA |
2594 | uint32_t dm_next_uevent_seq(struct mapped_device *md) |
2595 | { | |
2596 | return atomic_add_return(1, &md->uevent_seq); | |
2597 | } | |
2598 | ||
1da177e4 LT |
2599 | uint32_t dm_get_event_nr(struct mapped_device *md) |
2600 | { | |
2601 | return atomic_read(&md->event_nr); | |
2602 | } | |
2603 | ||
2604 | int dm_wait_event(struct mapped_device *md, int event_nr) | |
2605 | { | |
2606 | return wait_event_interruptible(md->eventq, | |
2607 | (event_nr != atomic_read(&md->event_nr))); | |
2608 | } | |
2609 | ||
7a8c3d3b MA |
2610 | void dm_uevent_add(struct mapped_device *md, struct list_head *elist) |
2611 | { | |
2612 | unsigned long flags; | |
2613 | ||
2614 | spin_lock_irqsave(&md->uevent_lock, flags); | |
2615 | list_add(elist, &md->uevent_list); | |
2616 | spin_unlock_irqrestore(&md->uevent_lock, flags); | |
2617 | } | |
2618 | ||
1da177e4 LT |
2619 | /* |
2620 | * The gendisk is only valid as long as you have a reference | |
2621 | * count on 'md'. | |
2622 | */ | |
2623 | struct gendisk *dm_disk(struct mapped_device *md) | |
2624 | { | |
2625 | return md->disk; | |
2626 | } | |
65ff5b7d | 2627 | EXPORT_SYMBOL_GPL(dm_disk); |
1da177e4 | 2628 | |
784aae73 MB |
2629 | struct kobject *dm_kobject(struct mapped_device *md) |
2630 | { | |
2995fa78 | 2631 | return &md->kobj_holder.kobj; |
784aae73 MB |
2632 | } |
2633 | ||
784aae73 MB |
2634 | struct mapped_device *dm_get_from_kobject(struct kobject *kobj) |
2635 | { | |
2636 | struct mapped_device *md; | |
2637 | ||
2995fa78 | 2638 | md = container_of(kobj, struct mapped_device, kobj_holder.kobj); |
784aae73 | 2639 | |
b9a41d21 HT |
2640 | spin_lock(&_minor_lock); |
2641 | if (test_bit(DMF_FREEING, &md->flags) || dm_deleting_md(md)) { | |
2642 | md = NULL; | |
2643 | goto out; | |
2644 | } | |
784aae73 | 2645 | dm_get(md); |
b9a41d21 HT |
2646 | out: |
2647 | spin_unlock(&_minor_lock); | |
2648 | ||
784aae73 MB |
2649 | return md; |
2650 | } | |
2651 | ||
4f186f8b | 2652 | int dm_suspended_md(struct mapped_device *md) |
1da177e4 LT |
2653 | { |
2654 | return test_bit(DMF_SUSPENDED, &md->flags); | |
2655 | } | |
2656 | ||
5df96f2b MP |
2657 | static int dm_post_suspending_md(struct mapped_device *md) |
2658 | { | |
2659 | return test_bit(DMF_POST_SUSPENDING, &md->flags); | |
2660 | } | |
2661 | ||
ffcc3936 MS |
2662 | int dm_suspended_internally_md(struct mapped_device *md) |
2663 | { | |
2664 | return test_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2665 | } | |
2666 | ||
2c140a24 MP |
2667 | int dm_test_deferred_remove_flag(struct mapped_device *md) |
2668 | { | |
2669 | return test_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
2670 | } | |
2671 | ||
64dbce58 KU |
2672 | int dm_suspended(struct dm_target *ti) |
2673 | { | |
33bd6f06 | 2674 | return dm_suspended_md(ti->table->md); |
64dbce58 KU |
2675 | } |
2676 | EXPORT_SYMBOL_GPL(dm_suspended); | |
2677 | ||
5df96f2b MP |
2678 | int dm_post_suspending(struct dm_target *ti) |
2679 | { | |
33bd6f06 | 2680 | return dm_post_suspending_md(ti->table->md); |
5df96f2b MP |
2681 | } |
2682 | EXPORT_SYMBOL_GPL(dm_post_suspending); | |
2683 | ||
2e93ccc1 KU |
2684 | int dm_noflush_suspending(struct dm_target *ti) |
2685 | { | |
33bd6f06 | 2686 | return __noflush_suspending(ti->table->md); |
2e93ccc1 KU |
2687 | } |
2688 | EXPORT_SYMBOL_GPL(dm_noflush_suspending); | |
2689 | ||
7e0d574f | 2690 | struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type, |
0776aa0e MS |
2691 | unsigned integrity, unsigned per_io_data_size, |
2692 | unsigned min_pool_size) | |
e6ee8c0b | 2693 | { |
115485e8 | 2694 | struct dm_md_mempools *pools = kzalloc_node(sizeof(*pools), GFP_KERNEL, md->numa_node_id); |
78d8e58a | 2695 | unsigned int pool_size = 0; |
64f52b0e | 2696 | unsigned int front_pad, io_front_pad; |
6f1c819c | 2697 | int ret; |
e6ee8c0b KU |
2698 | |
2699 | if (!pools) | |
4e6e36c3 | 2700 | return NULL; |
e6ee8c0b | 2701 | |
78d8e58a MS |
2702 | switch (type) { |
2703 | case DM_TYPE_BIO_BASED: | |
545ed20e | 2704 | case DM_TYPE_DAX_BIO_BASED: |
0776aa0e | 2705 | pool_size = max(dm_get_reserved_bio_based_ios(), min_pool_size); |
62f26317 JX |
2706 | front_pad = roundup(per_io_data_size, __alignof__(struct dm_target_io)) + DM_TARGET_IO_BIO_OFFSET; |
2707 | io_front_pad = roundup(per_io_data_size, __alignof__(struct dm_io)) + DM_IO_BIO_OFFSET; | |
6f1c819c KO |
2708 | ret = bioset_init(&pools->io_bs, pool_size, io_front_pad, 0); |
2709 | if (ret) | |
64f52b0e | 2710 | goto out; |
6f1c819c | 2711 | if (integrity && bioset_integrity_create(&pools->io_bs, pool_size)) |
eb8db831 | 2712 | goto out; |
78d8e58a MS |
2713 | break; |
2714 | case DM_TYPE_REQUEST_BASED: | |
0776aa0e | 2715 | pool_size = max(dm_get_reserved_rq_based_ios(), min_pool_size); |
78d8e58a | 2716 | front_pad = offsetof(struct dm_rq_clone_bio_info, clone); |
591ddcfc | 2717 | /* per_io_data_size is used for blk-mq pdu at queue allocation */ |
78d8e58a MS |
2718 | break; |
2719 | default: | |
2720 | BUG(); | |
2721 | } | |
2722 | ||
6f1c819c KO |
2723 | ret = bioset_init(&pools->bs, pool_size, front_pad, 0); |
2724 | if (ret) | |
5f015204 | 2725 | goto out; |
e6ee8c0b | 2726 | |
6f1c819c | 2727 | if (integrity && bioset_integrity_create(&pools->bs, pool_size)) |
5f015204 | 2728 | goto out; |
a91a2785 | 2729 | |
e6ee8c0b | 2730 | return pools; |
5f1b670d | 2731 | |
5f1b670d CH |
2732 | out: |
2733 | dm_free_md_mempools(pools); | |
78d8e58a | 2734 | |
4e6e36c3 | 2735 | return NULL; |
e6ee8c0b KU |
2736 | } |
2737 | ||
2738 | void dm_free_md_mempools(struct dm_md_mempools *pools) | |
2739 | { | |
2740 | if (!pools) | |
2741 | return; | |
2742 | ||
6f1c819c KO |
2743 | bioset_exit(&pools->bs); |
2744 | bioset_exit(&pools->io_bs); | |
e6ee8c0b KU |
2745 | |
2746 | kfree(pools); | |
2747 | } | |
2748 | ||
9c72bad1 CH |
2749 | struct dm_pr { |
2750 | u64 old_key; | |
2751 | u64 new_key; | |
2752 | u32 flags; | |
2753 | bool fail_early; | |
2754 | }; | |
2755 | ||
2756 | static int dm_call_pr(struct block_device *bdev, iterate_devices_callout_fn fn, | |
2757 | void *data) | |
71cdb697 CH |
2758 | { |
2759 | struct mapped_device *md = bdev->bd_disk->private_data; | |
9c72bad1 CH |
2760 | struct dm_table *table; |
2761 | struct dm_target *ti; | |
2762 | int ret = -ENOTTY, srcu_idx; | |
71cdb697 | 2763 | |
9c72bad1 CH |
2764 | table = dm_get_live_table(md, &srcu_idx); |
2765 | if (!table || !dm_table_get_size(table)) | |
2766 | goto out; | |
71cdb697 | 2767 | |
9c72bad1 CH |
2768 | /* We only support devices that have a single target */ |
2769 | if (dm_table_get_num_targets(table) != 1) | |
2770 | goto out; | |
2771 | ti = dm_table_get_target(table, 0); | |
71cdb697 | 2772 | |
9c72bad1 CH |
2773 | ret = -EINVAL; |
2774 | if (!ti->type->iterate_devices) | |
2775 | goto out; | |
2776 | ||
2777 | ret = ti->type->iterate_devices(ti, fn, data); | |
2778 | out: | |
2779 | dm_put_live_table(md, srcu_idx); | |
2780 | return ret; | |
2781 | } | |
2782 | ||
2783 | /* | |
2784 | * For register / unregister we need to manually call out to every path. | |
2785 | */ | |
2786 | static int __dm_pr_register(struct dm_target *ti, struct dm_dev *dev, | |
2787 | sector_t start, sector_t len, void *data) | |
2788 | { | |
2789 | struct dm_pr *pr = data; | |
2790 | const struct pr_ops *ops = dev->bdev->bd_disk->fops->pr_ops; | |
2791 | ||
2792 | if (!ops || !ops->pr_register) | |
2793 | return -EOPNOTSUPP; | |
2794 | return ops->pr_register(dev->bdev, pr->old_key, pr->new_key, pr->flags); | |
2795 | } | |
2796 | ||
2797 | static int dm_pr_register(struct block_device *bdev, u64 old_key, u64 new_key, | |
2798 | u32 flags) | |
2799 | { | |
2800 | struct dm_pr pr = { | |
2801 | .old_key = old_key, | |
2802 | .new_key = new_key, | |
2803 | .flags = flags, | |
2804 | .fail_early = true, | |
2805 | }; | |
2806 | int ret; | |
2807 | ||
2808 | ret = dm_call_pr(bdev, __dm_pr_register, &pr); | |
2809 | if (ret && new_key) { | |
2810 | /* unregister all paths if we failed to register any path */ | |
2811 | pr.old_key = new_key; | |
2812 | pr.new_key = 0; | |
2813 | pr.flags = 0; | |
2814 | pr.fail_early = false; | |
2815 | dm_call_pr(bdev, __dm_pr_register, &pr); | |
2816 | } | |
2817 | ||
2818 | return ret; | |
71cdb697 CH |
2819 | } |
2820 | ||
2821 | static int dm_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type, | |
956a4025 | 2822 | u32 flags) |
71cdb697 CH |
2823 | { |
2824 | struct mapped_device *md = bdev->bd_disk->private_data; | |
2825 | const struct pr_ops *ops; | |
971888c4 | 2826 | int r, srcu_idx; |
71cdb697 | 2827 | |
5bd5e8d8 | 2828 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
71cdb697 | 2829 | if (r < 0) |
971888c4 | 2830 | goto out; |
71cdb697 CH |
2831 | |
2832 | ops = bdev->bd_disk->fops->pr_ops; | |
2833 | if (ops && ops->pr_reserve) | |
2834 | r = ops->pr_reserve(bdev, key, type, flags); | |
2835 | else | |
2836 | r = -EOPNOTSUPP; | |
971888c4 MS |
2837 | out: |
2838 | dm_unprepare_ioctl(md, srcu_idx); | |
71cdb697 CH |
2839 | return r; |
2840 | } | |
2841 | ||
2842 | static int dm_pr_release(struct block_device *bdev, u64 key, enum pr_type type) | |
2843 | { | |
2844 | struct mapped_device *md = bdev->bd_disk->private_data; | |
2845 | const struct pr_ops *ops; | |
971888c4 | 2846 | int r, srcu_idx; |
71cdb697 | 2847 | |
5bd5e8d8 | 2848 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
71cdb697 | 2849 | if (r < 0) |
971888c4 | 2850 | goto out; |
71cdb697 CH |
2851 | |
2852 | ops = bdev->bd_disk->fops->pr_ops; | |
2853 | if (ops && ops->pr_release) | |
2854 | r = ops->pr_release(bdev, key, type); | |
2855 | else | |
2856 | r = -EOPNOTSUPP; | |
971888c4 MS |
2857 | out: |
2858 | dm_unprepare_ioctl(md, srcu_idx); | |
71cdb697 CH |
2859 | return r; |
2860 | } | |
2861 | ||
2862 | static int dm_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key, | |
956a4025 | 2863 | enum pr_type type, bool abort) |
71cdb697 CH |
2864 | { |
2865 | struct mapped_device *md = bdev->bd_disk->private_data; | |
2866 | const struct pr_ops *ops; | |
971888c4 | 2867 | int r, srcu_idx; |
71cdb697 | 2868 | |
5bd5e8d8 | 2869 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
71cdb697 | 2870 | if (r < 0) |
971888c4 | 2871 | goto out; |
71cdb697 CH |
2872 | |
2873 | ops = bdev->bd_disk->fops->pr_ops; | |
2874 | if (ops && ops->pr_preempt) | |
2875 | r = ops->pr_preempt(bdev, old_key, new_key, type, abort); | |
2876 | else | |
2877 | r = -EOPNOTSUPP; | |
971888c4 MS |
2878 | out: |
2879 | dm_unprepare_ioctl(md, srcu_idx); | |
71cdb697 CH |
2880 | return r; |
2881 | } | |
2882 | ||
2883 | static int dm_pr_clear(struct block_device *bdev, u64 key) | |
2884 | { | |
2885 | struct mapped_device *md = bdev->bd_disk->private_data; | |
2886 | const struct pr_ops *ops; | |
971888c4 | 2887 | int r, srcu_idx; |
71cdb697 | 2888 | |
5bd5e8d8 | 2889 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
71cdb697 | 2890 | if (r < 0) |
971888c4 | 2891 | goto out; |
71cdb697 CH |
2892 | |
2893 | ops = bdev->bd_disk->fops->pr_ops; | |
2894 | if (ops && ops->pr_clear) | |
2895 | r = ops->pr_clear(bdev, key); | |
2896 | else | |
2897 | r = -EOPNOTSUPP; | |
971888c4 MS |
2898 | out: |
2899 | dm_unprepare_ioctl(md, srcu_idx); | |
71cdb697 CH |
2900 | return r; |
2901 | } | |
2902 | ||
2903 | static const struct pr_ops dm_pr_ops = { | |
2904 | .pr_register = dm_pr_register, | |
2905 | .pr_reserve = dm_pr_reserve, | |
2906 | .pr_release = dm_pr_release, | |
2907 | .pr_preempt = dm_pr_preempt, | |
2908 | .pr_clear = dm_pr_clear, | |
2909 | }; | |
2910 | ||
83d5cde4 | 2911 | static const struct block_device_operations dm_blk_dops = { |
c62b37d9 | 2912 | .submit_bio = dm_submit_bio, |
1da177e4 LT |
2913 | .open = dm_blk_open, |
2914 | .release = dm_blk_close, | |
aa129a22 | 2915 | .ioctl = dm_blk_ioctl, |
3ac51e74 | 2916 | .getgeo = dm_blk_getgeo, |
e76239a3 | 2917 | .report_zones = dm_blk_report_zones, |
71cdb697 | 2918 | .pr_ops = &dm_pr_ops, |
1da177e4 LT |
2919 | .owner = THIS_MODULE |
2920 | }; | |
2921 | ||
681cc5e8 MS |
2922 | static const struct block_device_operations dm_rq_blk_dops = { |
2923 | .open = dm_blk_open, | |
2924 | .release = dm_blk_close, | |
2925 | .ioctl = dm_blk_ioctl, | |
2926 | .getgeo = dm_blk_getgeo, | |
2927 | .pr_ops = &dm_pr_ops, | |
2928 | .owner = THIS_MODULE | |
2929 | }; | |
2930 | ||
f26c5719 DW |
2931 | static const struct dax_operations dm_dax_ops = { |
2932 | .direct_access = dm_dax_direct_access, | |
cdf6cdcd | 2933 | .zero_page_range = dm_dax_zero_page_range, |
f26c5719 DW |
2934 | }; |
2935 | ||
1da177e4 LT |
2936 | /* |
2937 | * module hooks | |
2938 | */ | |
2939 | module_init(dm_init); | |
2940 | module_exit(dm_exit); | |
2941 | ||
2942 | module_param(major, uint, 0); | |
2943 | MODULE_PARM_DESC(major, "The major number of the device mapper"); | |
f4790826 | 2944 | |
e8603136 MS |
2945 | module_param(reserved_bio_based_ios, uint, S_IRUGO | S_IWUSR); |
2946 | MODULE_PARM_DESC(reserved_bio_based_ios, "Reserved IOs in bio-based mempools"); | |
2947 | ||
115485e8 MS |
2948 | module_param(dm_numa_node, int, S_IRUGO | S_IWUSR); |
2949 | MODULE_PARM_DESC(dm_numa_node, "NUMA node for DM device memory allocations"); | |
2950 | ||
a666e5c0 MP |
2951 | module_param(swap_bios, int, S_IRUGO | S_IWUSR); |
2952 | MODULE_PARM_DESC(swap_bios, "Maximum allowed inflight swap IOs"); | |
2953 | ||
1da177e4 LT |
2954 | MODULE_DESCRIPTION(DM_NAME " driver"); |
2955 | MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>"); | |
2956 | MODULE_LICENSE("GPL"); |