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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2001, 2002 Sistina Software (UK) Limited. | |
784aae73 | 3 | * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
1da177e4 LT |
4 | * |
5 | * This file is released under the GPL. | |
6 | */ | |
7 | ||
4cc96131 MS |
8 | #include "dm-core.h" |
9 | #include "dm-rq.h" | |
51e5b2bd | 10 | #include "dm-uevent.h" |
1da177e4 LT |
11 | |
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
48c9c27b | 14 | #include <linux/mutex.h> |
6958c1c6 | 15 | #include <linux/sched/mm.h> |
174cd4b1 | 16 | #include <linux/sched/signal.h> |
1da177e4 LT |
17 | #include <linux/blkpg.h> |
18 | #include <linux/bio.h> | |
1da177e4 | 19 | #include <linux/mempool.h> |
f26c5719 | 20 | #include <linux/dax.h> |
1da177e4 LT |
21 | #include <linux/slab.h> |
22 | #include <linux/idr.h> | |
7e026c8c | 23 | #include <linux/uio.h> |
3ac51e74 | 24 | #include <linux/hdreg.h> |
3f77316d | 25 | #include <linux/delay.h> |
ffcc3936 | 26 | #include <linux/wait.h> |
71cdb697 | 27 | #include <linux/pr.h> |
b0b4d7c6 | 28 | #include <linux/refcount.h> |
c6a564ff | 29 | #include <linux/part_stat.h> |
a892c8d5 | 30 | #include <linux/blk-crypto.h> |
aa6ce87a | 31 | #include <linux/keyslot-manager.h> |
55782138 | 32 | |
72d94861 AK |
33 | #define DM_MSG_PREFIX "core" |
34 | ||
60935eb2 MB |
35 | /* |
36 | * Cookies are numeric values sent with CHANGE and REMOVE | |
37 | * uevents while resuming, removing or renaming the device. | |
38 | */ | |
39 | #define DM_COOKIE_ENV_VAR_NAME "DM_COOKIE" | |
40 | #define DM_COOKIE_LENGTH 24 | |
41 | ||
1da177e4 LT |
42 | static const char *_name = DM_NAME; |
43 | ||
44 | static unsigned int major = 0; | |
45 | static unsigned int _major = 0; | |
46 | ||
d15b774c AK |
47 | static DEFINE_IDR(_minor_idr); |
48 | ||
f32c10b0 | 49 | static DEFINE_SPINLOCK(_minor_lock); |
2c140a24 MP |
50 | |
51 | static void do_deferred_remove(struct work_struct *w); | |
52 | ||
53 | static DECLARE_WORK(deferred_remove_work, do_deferred_remove); | |
54 | ||
acfe0ad7 MP |
55 | static struct workqueue_struct *deferred_remove_workqueue; |
56 | ||
93e6442c MP |
57 | atomic_t dm_global_event_nr = ATOMIC_INIT(0); |
58 | DECLARE_WAIT_QUEUE_HEAD(dm_global_eventq); | |
59 | ||
62e08243 MP |
60 | void dm_issue_global_event(void) |
61 | { | |
62 | atomic_inc(&dm_global_event_nr); | |
63 | wake_up(&dm_global_eventq); | |
64 | } | |
65 | ||
1da177e4 | 66 | /* |
64f52b0e | 67 | * One of these is allocated (on-stack) per original bio. |
1da177e4 | 68 | */ |
64f52b0e | 69 | struct clone_info { |
64f52b0e MS |
70 | struct dm_table *map; |
71 | struct bio *bio; | |
72 | struct dm_io *io; | |
73 | sector_t sector; | |
74 | unsigned sector_count; | |
75 | }; | |
76 | ||
77 | /* | |
78 | * One of these is allocated per clone bio. | |
79 | */ | |
80 | #define DM_TIO_MAGIC 7282014 | |
81 | struct dm_target_io { | |
82 | unsigned magic; | |
83 | struct dm_io *io; | |
84 | struct dm_target *ti; | |
85 | unsigned target_bio_nr; | |
86 | unsigned *len_ptr; | |
87 | bool inside_dm_io; | |
88 | struct bio clone; | |
89 | }; | |
90 | ||
1da177e4 | 91 | /* |
745dc570 | 92 | * One of these is allocated per original bio. |
64f52b0e | 93 | * It contains the first clone used for that original. |
1da177e4 | 94 | */ |
64f52b0e | 95 | #define DM_IO_MAGIC 5191977 |
1da177e4 | 96 | struct dm_io { |
64f52b0e | 97 | unsigned magic; |
1da177e4 | 98 | struct mapped_device *md; |
4e4cbee9 | 99 | blk_status_t status; |
1da177e4 | 100 | atomic_t io_count; |
745dc570 | 101 | struct bio *orig_bio; |
3eaf840e | 102 | unsigned long start_time; |
f88fb981 | 103 | spinlock_t endio_lock; |
fd2ed4d2 | 104 | struct dm_stats_aux stats_aux; |
64f52b0e MS |
105 | /* last member of dm_target_io is 'struct bio' */ |
106 | struct dm_target_io tio; | |
1da177e4 LT |
107 | }; |
108 | ||
62f26317 JX |
109 | #define DM_TARGET_IO_BIO_OFFSET (offsetof(struct dm_target_io, clone)) |
110 | #define DM_IO_BIO_OFFSET \ | |
111 | (offsetof(struct dm_target_io, clone) + offsetof(struct dm_io, tio)) | |
112 | ||
64f52b0e MS |
113 | void *dm_per_bio_data(struct bio *bio, size_t data_size) |
114 | { | |
115 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); | |
116 | if (!tio->inside_dm_io) | |
62f26317 JX |
117 | return (char *)bio - DM_TARGET_IO_BIO_OFFSET - data_size; |
118 | return (char *)bio - DM_IO_BIO_OFFSET - data_size; | |
64f52b0e MS |
119 | } |
120 | EXPORT_SYMBOL_GPL(dm_per_bio_data); | |
121 | ||
122 | struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size) | |
123 | { | |
124 | struct dm_io *io = (struct dm_io *)((char *)data + data_size); | |
125 | if (io->magic == DM_IO_MAGIC) | |
62f26317 | 126 | return (struct bio *)((char *)io + DM_IO_BIO_OFFSET); |
64f52b0e | 127 | BUG_ON(io->magic != DM_TIO_MAGIC); |
62f26317 | 128 | return (struct bio *)((char *)io + DM_TARGET_IO_BIO_OFFSET); |
64f52b0e MS |
129 | } |
130 | EXPORT_SYMBOL_GPL(dm_bio_from_per_bio_data); | |
131 | ||
132 | unsigned dm_bio_get_target_bio_nr(const struct bio *bio) | |
133 | { | |
134 | return container_of(bio, struct dm_target_io, clone)->target_bio_nr; | |
135 | } | |
136 | EXPORT_SYMBOL_GPL(dm_bio_get_target_bio_nr); | |
137 | ||
ba61fdd1 JM |
138 | #define MINOR_ALLOCED ((void *)-1) |
139 | ||
1da177e4 LT |
140 | /* |
141 | * Bits for the md->flags field. | |
142 | */ | |
1eb787ec | 143 | #define DMF_BLOCK_IO_FOR_SUSPEND 0 |
1da177e4 | 144 | #define DMF_SUSPENDED 1 |
aa8d7c2f | 145 | #define DMF_FROZEN 2 |
fba9f90e | 146 | #define DMF_FREEING 3 |
5c6bd75d | 147 | #define DMF_DELETING 4 |
2e93ccc1 | 148 | #define DMF_NOFLUSH_SUSPENDING 5 |
8ae12666 KO |
149 | #define DMF_DEFERRED_REMOVE 6 |
150 | #define DMF_SUSPENDED_INTERNALLY 7 | |
5df96f2b | 151 | #define DMF_POST_SUSPENDING 8 |
1da177e4 | 152 | |
115485e8 | 153 | #define DM_NUMA_NODE NUMA_NO_NODE |
115485e8 | 154 | static int dm_numa_node = DM_NUMA_NODE; |
faad87df | 155 | |
a666e5c0 MP |
156 | #define DEFAULT_SWAP_BIOS (8 * 1048576 / PAGE_SIZE) |
157 | static int swap_bios = DEFAULT_SWAP_BIOS; | |
158 | static int get_swap_bios(void) | |
159 | { | |
160 | int latch = READ_ONCE(swap_bios); | |
161 | if (unlikely(latch <= 0)) | |
162 | latch = DEFAULT_SWAP_BIOS; | |
163 | return latch; | |
164 | } | |
165 | ||
e6ee8c0b KU |
166 | /* |
167 | * For mempools pre-allocation at the table loading time. | |
168 | */ | |
169 | struct dm_md_mempools { | |
6f1c819c KO |
170 | struct bio_set bs; |
171 | struct bio_set io_bs; | |
e6ee8c0b KU |
172 | }; |
173 | ||
86f1152b BM |
174 | struct table_device { |
175 | struct list_head list; | |
b0b4d7c6 | 176 | refcount_t count; |
86f1152b BM |
177 | struct dm_dev dm_dev; |
178 | }; | |
179 | ||
e8603136 MS |
180 | /* |
181 | * Bio-based DM's mempools' reserved IOs set by the user. | |
182 | */ | |
4cc96131 | 183 | #define RESERVED_BIO_BASED_IOS 16 |
e8603136 MS |
184 | static unsigned reserved_bio_based_ios = RESERVED_BIO_BASED_IOS; |
185 | ||
115485e8 MS |
186 | static int __dm_get_module_param_int(int *module_param, int min, int max) |
187 | { | |
6aa7de05 | 188 | int param = READ_ONCE(*module_param); |
115485e8 MS |
189 | int modified_param = 0; |
190 | bool modified = true; | |
191 | ||
192 | if (param < min) | |
193 | modified_param = min; | |
194 | else if (param > max) | |
195 | modified_param = max; | |
196 | else | |
197 | modified = false; | |
198 | ||
199 | if (modified) { | |
200 | (void)cmpxchg(module_param, param, modified_param); | |
201 | param = modified_param; | |
202 | } | |
203 | ||
204 | return param; | |
205 | } | |
206 | ||
4cc96131 MS |
207 | unsigned __dm_get_module_param(unsigned *module_param, |
208 | unsigned def, unsigned max) | |
f4790826 | 209 | { |
6aa7de05 | 210 | unsigned param = READ_ONCE(*module_param); |
09c2d531 | 211 | unsigned modified_param = 0; |
f4790826 | 212 | |
09c2d531 MS |
213 | if (!param) |
214 | modified_param = def; | |
215 | else if (param > max) | |
216 | modified_param = max; | |
f4790826 | 217 | |
09c2d531 MS |
218 | if (modified_param) { |
219 | (void)cmpxchg(module_param, param, modified_param); | |
220 | param = modified_param; | |
f4790826 MS |
221 | } |
222 | ||
09c2d531 | 223 | return param; |
f4790826 MS |
224 | } |
225 | ||
e8603136 MS |
226 | unsigned dm_get_reserved_bio_based_ios(void) |
227 | { | |
09c2d531 | 228 | return __dm_get_module_param(&reserved_bio_based_ios, |
4cc96131 | 229 | RESERVED_BIO_BASED_IOS, DM_RESERVED_MAX_IOS); |
e8603136 MS |
230 | } |
231 | EXPORT_SYMBOL_GPL(dm_get_reserved_bio_based_ios); | |
232 | ||
115485e8 MS |
233 | static unsigned dm_get_numa_node(void) |
234 | { | |
235 | return __dm_get_module_param_int(&dm_numa_node, | |
236 | DM_NUMA_NODE, num_online_nodes() - 1); | |
237 | } | |
238 | ||
1da177e4 LT |
239 | static int __init local_init(void) |
240 | { | |
e689fbab | 241 | int r; |
1ae49ea2 | 242 | |
51e5b2bd | 243 | r = dm_uevent_init(); |
51157b4a | 244 | if (r) |
e689fbab | 245 | return r; |
51e5b2bd | 246 | |
acfe0ad7 MP |
247 | deferred_remove_workqueue = alloc_workqueue("kdmremove", WQ_UNBOUND, 1); |
248 | if (!deferred_remove_workqueue) { | |
249 | r = -ENOMEM; | |
250 | goto out_uevent_exit; | |
251 | } | |
252 | ||
1da177e4 LT |
253 | _major = major; |
254 | r = register_blkdev(_major, _name); | |
51157b4a | 255 | if (r < 0) |
acfe0ad7 | 256 | goto out_free_workqueue; |
1da177e4 LT |
257 | |
258 | if (!_major) | |
259 | _major = r; | |
260 | ||
261 | return 0; | |
51157b4a | 262 | |
acfe0ad7 MP |
263 | out_free_workqueue: |
264 | destroy_workqueue(deferred_remove_workqueue); | |
51157b4a KU |
265 | out_uevent_exit: |
266 | dm_uevent_exit(); | |
51157b4a KU |
267 | |
268 | return r; | |
1da177e4 LT |
269 | } |
270 | ||
271 | static void local_exit(void) | |
272 | { | |
2c140a24 | 273 | flush_scheduled_work(); |
acfe0ad7 | 274 | destroy_workqueue(deferred_remove_workqueue); |
2c140a24 | 275 | |
00d59405 | 276 | unregister_blkdev(_major, _name); |
51e5b2bd | 277 | dm_uevent_exit(); |
1da177e4 LT |
278 | |
279 | _major = 0; | |
280 | ||
281 | DMINFO("cleaned up"); | |
282 | } | |
283 | ||
b9249e55 | 284 | static int (*_inits[])(void) __initdata = { |
1da177e4 LT |
285 | local_init, |
286 | dm_target_init, | |
287 | dm_linear_init, | |
288 | dm_stripe_init, | |
952b3557 | 289 | dm_io_init, |
945fa4d2 | 290 | dm_kcopyd_init, |
1da177e4 | 291 | dm_interface_init, |
fd2ed4d2 | 292 | dm_statistics_init, |
1da177e4 LT |
293 | }; |
294 | ||
b9249e55 | 295 | static void (*_exits[])(void) = { |
1da177e4 LT |
296 | local_exit, |
297 | dm_target_exit, | |
298 | dm_linear_exit, | |
299 | dm_stripe_exit, | |
952b3557 | 300 | dm_io_exit, |
945fa4d2 | 301 | dm_kcopyd_exit, |
1da177e4 | 302 | dm_interface_exit, |
fd2ed4d2 | 303 | dm_statistics_exit, |
1da177e4 LT |
304 | }; |
305 | ||
306 | static int __init dm_init(void) | |
307 | { | |
308 | const int count = ARRAY_SIZE(_inits); | |
309 | ||
310 | int r, i; | |
311 | ||
312 | for (i = 0; i < count; i++) { | |
313 | r = _inits[i](); | |
314 | if (r) | |
315 | goto bad; | |
316 | } | |
317 | ||
318 | return 0; | |
319 | ||
320 | bad: | |
321 | while (i--) | |
322 | _exits[i](); | |
323 | ||
324 | return r; | |
325 | } | |
326 | ||
327 | static void __exit dm_exit(void) | |
328 | { | |
329 | int i = ARRAY_SIZE(_exits); | |
330 | ||
331 | while (i--) | |
332 | _exits[i](); | |
d15b774c AK |
333 | |
334 | /* | |
335 | * Should be empty by this point. | |
336 | */ | |
d15b774c | 337 | idr_destroy(&_minor_idr); |
1da177e4 LT |
338 | } |
339 | ||
340 | /* | |
341 | * Block device functions | |
342 | */ | |
432a212c MA |
343 | int dm_deleting_md(struct mapped_device *md) |
344 | { | |
345 | return test_bit(DMF_DELETING, &md->flags); | |
346 | } | |
347 | ||
fe5f9f2c | 348 | static int dm_blk_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
349 | { |
350 | struct mapped_device *md; | |
351 | ||
fba9f90e JM |
352 | spin_lock(&_minor_lock); |
353 | ||
fe5f9f2c | 354 | md = bdev->bd_disk->private_data; |
fba9f90e JM |
355 | if (!md) |
356 | goto out; | |
357 | ||
5c6bd75d | 358 | if (test_bit(DMF_FREEING, &md->flags) || |
432a212c | 359 | dm_deleting_md(md)) { |
fba9f90e JM |
360 | md = NULL; |
361 | goto out; | |
362 | } | |
363 | ||
1da177e4 | 364 | dm_get(md); |
5c6bd75d | 365 | atomic_inc(&md->open_count); |
fba9f90e JM |
366 | out: |
367 | spin_unlock(&_minor_lock); | |
368 | ||
369 | return md ? 0 : -ENXIO; | |
1da177e4 LT |
370 | } |
371 | ||
db2a144b | 372 | static void dm_blk_close(struct gendisk *disk, fmode_t mode) |
1da177e4 | 373 | { |
63a4f065 | 374 | struct mapped_device *md; |
6e9624b8 | 375 | |
4a1aeb98 MB |
376 | spin_lock(&_minor_lock); |
377 | ||
63a4f065 MS |
378 | md = disk->private_data; |
379 | if (WARN_ON(!md)) | |
380 | goto out; | |
381 | ||
2c140a24 MP |
382 | if (atomic_dec_and_test(&md->open_count) && |
383 | (test_bit(DMF_DEFERRED_REMOVE, &md->flags))) | |
acfe0ad7 | 384 | queue_work(deferred_remove_workqueue, &deferred_remove_work); |
2c140a24 | 385 | |
1da177e4 | 386 | dm_put(md); |
63a4f065 | 387 | out: |
4a1aeb98 | 388 | spin_unlock(&_minor_lock); |
1da177e4 LT |
389 | } |
390 | ||
5c6bd75d AK |
391 | int dm_open_count(struct mapped_device *md) |
392 | { | |
393 | return atomic_read(&md->open_count); | |
394 | } | |
395 | ||
396 | /* | |
397 | * Guarantees nothing is using the device before it's deleted. | |
398 | */ | |
2c140a24 | 399 | int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred) |
5c6bd75d AK |
400 | { |
401 | int r = 0; | |
402 | ||
403 | spin_lock(&_minor_lock); | |
404 | ||
2c140a24 | 405 | if (dm_open_count(md)) { |
5c6bd75d | 406 | r = -EBUSY; |
2c140a24 MP |
407 | if (mark_deferred) |
408 | set_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
409 | } else if (only_deferred && !test_bit(DMF_DEFERRED_REMOVE, &md->flags)) | |
410 | r = -EEXIST; | |
5c6bd75d AK |
411 | else |
412 | set_bit(DMF_DELETING, &md->flags); | |
413 | ||
414 | spin_unlock(&_minor_lock); | |
415 | ||
416 | return r; | |
417 | } | |
418 | ||
2c140a24 MP |
419 | int dm_cancel_deferred_remove(struct mapped_device *md) |
420 | { | |
421 | int r = 0; | |
422 | ||
423 | spin_lock(&_minor_lock); | |
424 | ||
425 | if (test_bit(DMF_DELETING, &md->flags)) | |
426 | r = -EBUSY; | |
427 | else | |
428 | clear_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
429 | ||
430 | spin_unlock(&_minor_lock); | |
431 | ||
432 | return r; | |
433 | } | |
434 | ||
435 | static void do_deferred_remove(struct work_struct *w) | |
436 | { | |
437 | dm_deferred_remove(); | |
438 | } | |
439 | ||
3ac51e74 DW |
440 | static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
441 | { | |
442 | struct mapped_device *md = bdev->bd_disk->private_data; | |
443 | ||
444 | return dm_get_geometry(md, geo); | |
445 | } | |
446 | ||
d4100351 CH |
447 | #ifdef CONFIG_BLK_DEV_ZONED |
448 | int dm_report_zones_cb(struct blk_zone *zone, unsigned int idx, void *data) | |
449 | { | |
450 | struct dm_report_zones_args *args = data; | |
451 | sector_t sector_diff = args->tgt->begin - args->start; | |
452 | ||
453 | /* | |
454 | * Ignore zones beyond the target range. | |
455 | */ | |
456 | if (zone->start >= args->start + args->tgt->len) | |
457 | return 0; | |
458 | ||
459 | /* | |
460 | * Remap the start sector and write pointer position of the zone | |
461 | * to match its position in the target range. | |
462 | */ | |
463 | zone->start += sector_diff; | |
464 | if (zone->type != BLK_ZONE_TYPE_CONVENTIONAL) { | |
465 | if (zone->cond == BLK_ZONE_COND_FULL) | |
466 | zone->wp = zone->start + zone->len; | |
467 | else if (zone->cond == BLK_ZONE_COND_EMPTY) | |
468 | zone->wp = zone->start; | |
469 | else | |
470 | zone->wp += sector_diff; | |
471 | } | |
472 | ||
473 | args->next_sector = zone->start + zone->len; | |
474 | return args->orig_cb(zone, args->zone_idx++, args->orig_data); | |
475 | } | |
476 | EXPORT_SYMBOL_GPL(dm_report_zones_cb); | |
477 | ||
e76239a3 | 478 | static int dm_blk_report_zones(struct gendisk *disk, sector_t sector, |
d4100351 | 479 | unsigned int nr_zones, report_zones_cb cb, void *data) |
e76239a3 | 480 | { |
e76239a3 | 481 | struct mapped_device *md = disk->private_data; |
e76239a3 CH |
482 | struct dm_table *map; |
483 | int srcu_idx, ret; | |
d4100351 CH |
484 | struct dm_report_zones_args args = { |
485 | .next_sector = sector, | |
486 | .orig_data = data, | |
487 | .orig_cb = cb, | |
488 | }; | |
e76239a3 CH |
489 | |
490 | if (dm_suspended_md(md)) | |
491 | return -EAGAIN; | |
492 | ||
493 | map = dm_get_live_table(md, &srcu_idx); | |
89478335 SS |
494 | if (!map) { |
495 | ret = -EIO; | |
496 | goto out; | |
497 | } | |
e76239a3 | 498 | |
d4100351 CH |
499 | do { |
500 | struct dm_target *tgt; | |
e76239a3 | 501 | |
d4100351 CH |
502 | tgt = dm_table_find_target(map, args.next_sector); |
503 | if (WARN_ON_ONCE(!tgt->type->report_zones)) { | |
504 | ret = -EIO; | |
505 | goto out; | |
506 | } | |
e76239a3 | 507 | |
d4100351 | 508 | args.tgt = tgt; |
a9cb9f41 JT |
509 | ret = tgt->type->report_zones(tgt, &args, |
510 | nr_zones - args.zone_idx); | |
d4100351 CH |
511 | if (ret < 0) |
512 | goto out; | |
513 | } while (args.zone_idx < nr_zones && | |
514 | args.next_sector < get_capacity(disk)); | |
e76239a3 | 515 | |
d4100351 | 516 | ret = args.zone_idx; |
e76239a3 CH |
517 | out: |
518 | dm_put_live_table(md, srcu_idx); | |
519 | return ret; | |
e76239a3 | 520 | } |
d4100351 CH |
521 | #else |
522 | #define dm_blk_report_zones NULL | |
523 | #endif /* CONFIG_BLK_DEV_ZONED */ | |
e76239a3 | 524 | |
971888c4 | 525 | static int dm_prepare_ioctl(struct mapped_device *md, int *srcu_idx, |
5bd5e8d8 | 526 | struct block_device **bdev) |
aa129a22 | 527 | { |
66482026 | 528 | struct dm_target *tgt; |
6c182cd8 | 529 | struct dm_table *map; |
971888c4 | 530 | int r; |
aa129a22 | 531 | |
6c182cd8 | 532 | retry: |
e56f81e0 | 533 | r = -ENOTTY; |
971888c4 | 534 | map = dm_get_live_table(md, srcu_idx); |
aa129a22 | 535 | if (!map || !dm_table_get_size(map)) |
971888c4 | 536 | return r; |
aa129a22 MB |
537 | |
538 | /* We only support devices that have a single target */ | |
539 | if (dm_table_get_num_targets(map) != 1) | |
971888c4 | 540 | return r; |
aa129a22 | 541 | |
66482026 MS |
542 | tgt = dm_table_get_target(map, 0); |
543 | if (!tgt->type->prepare_ioctl) | |
971888c4 | 544 | return r; |
519049af | 545 | |
971888c4 MS |
546 | if (dm_suspended_md(md)) |
547 | return -EAGAIN; | |
aa129a22 | 548 | |
5bd5e8d8 | 549 | r = tgt->type->prepare_ioctl(tgt, bdev); |
5bbbfdf6 | 550 | if (r == -ENOTCONN && !fatal_signal_pending(current)) { |
971888c4 | 551 | dm_put_live_table(md, *srcu_idx); |
6c182cd8 HR |
552 | msleep(10); |
553 | goto retry; | |
554 | } | |
971888c4 | 555 | |
e56f81e0 CH |
556 | return r; |
557 | } | |
558 | ||
971888c4 | 559 | static void dm_unprepare_ioctl(struct mapped_device *md, int srcu_idx) |
971888c4 MS |
560 | { |
561 | dm_put_live_table(md, srcu_idx); | |
562 | } | |
563 | ||
e56f81e0 CH |
564 | static int dm_blk_ioctl(struct block_device *bdev, fmode_t mode, |
565 | unsigned int cmd, unsigned long arg) | |
566 | { | |
567 | struct mapped_device *md = bdev->bd_disk->private_data; | |
971888c4 | 568 | int r, srcu_idx; |
e56f81e0 | 569 | |
5bd5e8d8 | 570 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
e56f81e0 | 571 | if (r < 0) |
971888c4 | 572 | goto out; |
6c182cd8 | 573 | |
e56f81e0 CH |
574 | if (r > 0) { |
575 | /* | |
e980f623 CH |
576 | * Target determined this ioctl is being issued against a |
577 | * subset of the parent bdev; require extra privileges. | |
e56f81e0 | 578 | */ |
e980f623 | 579 | if (!capable(CAP_SYS_RAWIO)) { |
0378c625 | 580 | DMDEBUG_LIMIT( |
e980f623 CH |
581 | "%s: sending ioctl %x to DM device without required privilege.", |
582 | current->comm, cmd); | |
583 | r = -ENOIOCTLCMD; | |
e56f81e0 | 584 | goto out; |
e980f623 | 585 | } |
e56f81e0 | 586 | } |
6c182cd8 | 587 | |
a7cb3d2f CH |
588 | if (!bdev->bd_disk->fops->ioctl) |
589 | r = -ENOTTY; | |
590 | else | |
591 | r = bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg); | |
e56f81e0 | 592 | out: |
971888c4 | 593 | dm_unprepare_ioctl(md, srcu_idx); |
aa129a22 MB |
594 | return r; |
595 | } | |
596 | ||
7465d7ac MS |
597 | u64 dm_start_time_ns_from_clone(struct bio *bio) |
598 | { | |
599 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); | |
600 | struct dm_io *io = tio->io; | |
601 | ||
602 | return jiffies_to_nsecs(io->start_time); | |
603 | } | |
604 | EXPORT_SYMBOL_GPL(dm_start_time_ns_from_clone); | |
605 | ||
606 | static void start_io_acct(struct dm_io *io) | |
607 | { | |
608 | struct mapped_device *md = io->md; | |
609 | struct bio *bio = io->orig_bio; | |
610 | ||
611 | io->start_time = bio_start_io_acct(bio); | |
612 | if (unlikely(dm_stats_used(&md->stats))) | |
613 | dm_stats_account_io(&md->stats, bio_data_dir(bio), | |
614 | bio->bi_iter.bi_sector, bio_sectors(bio), | |
615 | false, 0, &io->stats_aux); | |
616 | } | |
617 | ||
618 | static void end_io_acct(struct dm_io *io) | |
619 | { | |
620 | struct mapped_device *md = io->md; | |
621 | struct bio *bio = io->orig_bio; | |
622 | unsigned long duration = jiffies - io->start_time; | |
623 | ||
624 | bio_end_io_acct(bio, io->start_time); | |
625 | ||
626 | if (unlikely(dm_stats_used(&md->stats))) | |
627 | dm_stats_account_io(&md->stats, bio_data_dir(bio), | |
628 | bio->bi_iter.bi_sector, bio_sectors(bio), | |
629 | true, duration, &io->stats_aux); | |
630 | ||
631 | /* nudge anyone waiting on suspend queue */ | |
632 | if (unlikely(wq_has_sleeper(&md->wait))) | |
633 | wake_up(&md->wait); | |
634 | } | |
978e51ba MS |
635 | |
636 | static struct dm_io *alloc_io(struct mapped_device *md, struct bio *bio) | |
1da177e4 | 637 | { |
64f52b0e MS |
638 | struct dm_io *io; |
639 | struct dm_target_io *tio; | |
640 | struct bio *clone; | |
641 | ||
6f1c819c | 642 | clone = bio_alloc_bioset(GFP_NOIO, 0, &md->io_bs); |
64f52b0e MS |
643 | if (!clone) |
644 | return NULL; | |
645 | ||
646 | tio = container_of(clone, struct dm_target_io, clone); | |
647 | tio->inside_dm_io = true; | |
648 | tio->io = NULL; | |
649 | ||
650 | io = container_of(tio, struct dm_io, tio); | |
651 | io->magic = DM_IO_MAGIC; | |
978e51ba MS |
652 | io->status = 0; |
653 | atomic_set(&io->io_count, 1); | |
654 | io->orig_bio = bio; | |
655 | io->md = md; | |
656 | spin_lock_init(&io->endio_lock); | |
657 | ||
658 | start_io_acct(io); | |
64f52b0e MS |
659 | |
660 | return io; | |
1da177e4 LT |
661 | } |
662 | ||
028867ac | 663 | static void free_io(struct mapped_device *md, struct dm_io *io) |
1da177e4 | 664 | { |
64f52b0e MS |
665 | bio_put(&io->tio.clone); |
666 | } | |
667 | ||
668 | static struct dm_target_io *alloc_tio(struct clone_info *ci, struct dm_target *ti, | |
669 | unsigned target_bio_nr, gfp_t gfp_mask) | |
670 | { | |
671 | struct dm_target_io *tio; | |
672 | ||
673 | if (!ci->io->tio.io) { | |
674 | /* the dm_target_io embedded in ci->io is available */ | |
675 | tio = &ci->io->tio; | |
676 | } else { | |
6f1c819c | 677 | struct bio *clone = bio_alloc_bioset(gfp_mask, 0, &ci->io->md->bs); |
64f52b0e MS |
678 | if (!clone) |
679 | return NULL; | |
680 | ||
681 | tio = container_of(clone, struct dm_target_io, clone); | |
682 | tio->inside_dm_io = false; | |
683 | } | |
684 | ||
685 | tio->magic = DM_TIO_MAGIC; | |
686 | tio->io = ci->io; | |
687 | tio->ti = ti; | |
688 | tio->target_bio_nr = target_bio_nr; | |
689 | ||
690 | return tio; | |
1da177e4 LT |
691 | } |
692 | ||
cfae7529 | 693 | static void free_tio(struct dm_target_io *tio) |
1da177e4 | 694 | { |
64f52b0e MS |
695 | if (tio->inside_dm_io) |
696 | return; | |
dba14160 | 697 | bio_put(&tio->clone); |
1da177e4 LT |
698 | } |
699 | ||
700 | /* | |
701 | * Add the bio to the list of deferred io. | |
702 | */ | |
92c63902 | 703 | static void queue_io(struct mapped_device *md, struct bio *bio) |
1da177e4 | 704 | { |
05447420 | 705 | unsigned long flags; |
1da177e4 | 706 | |
05447420 | 707 | spin_lock_irqsave(&md->deferred_lock, flags); |
1da177e4 | 708 | bio_list_add(&md->deferred, bio); |
05447420 | 709 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
6a8736d1 | 710 | queue_work(md->wq, &md->work); |
1da177e4 LT |
711 | } |
712 | ||
713 | /* | |
714 | * Everyone (including functions in this file), should use this | |
715 | * function to access the md->map field, and make sure they call | |
83d5e5b0 | 716 | * dm_put_live_table() when finished. |
1da177e4 | 717 | */ |
83d5e5b0 | 718 | struct dm_table *dm_get_live_table(struct mapped_device *md, int *srcu_idx) __acquires(md->io_barrier) |
1da177e4 | 719 | { |
83d5e5b0 MP |
720 | *srcu_idx = srcu_read_lock(&md->io_barrier); |
721 | ||
722 | return srcu_dereference(md->map, &md->io_barrier); | |
723 | } | |
1da177e4 | 724 | |
83d5e5b0 MP |
725 | void dm_put_live_table(struct mapped_device *md, int srcu_idx) __releases(md->io_barrier) |
726 | { | |
727 | srcu_read_unlock(&md->io_barrier, srcu_idx); | |
728 | } | |
729 | ||
730 | void dm_sync_table(struct mapped_device *md) | |
731 | { | |
732 | synchronize_srcu(&md->io_barrier); | |
733 | synchronize_rcu_expedited(); | |
734 | } | |
735 | ||
736 | /* | |
737 | * A fast alternative to dm_get_live_table/dm_put_live_table. | |
738 | * The caller must not block between these two functions. | |
739 | */ | |
740 | static struct dm_table *dm_get_live_table_fast(struct mapped_device *md) __acquires(RCU) | |
741 | { | |
742 | rcu_read_lock(); | |
743 | return rcu_dereference(md->map); | |
744 | } | |
1da177e4 | 745 | |
83d5e5b0 MP |
746 | static void dm_put_live_table_fast(struct mapped_device *md) __releases(RCU) |
747 | { | |
748 | rcu_read_unlock(); | |
1da177e4 LT |
749 | } |
750 | ||
971888c4 MS |
751 | static char *_dm_claim_ptr = "I belong to device-mapper"; |
752 | ||
86f1152b BM |
753 | /* |
754 | * Open a table device so we can use it as a map destination. | |
755 | */ | |
756 | static int open_table_device(struct table_device *td, dev_t dev, | |
757 | struct mapped_device *md) | |
758 | { | |
86f1152b BM |
759 | struct block_device *bdev; |
760 | ||
761 | int r; | |
762 | ||
763 | BUG_ON(td->dm_dev.bdev); | |
764 | ||
519049af | 765 | bdev = blkdev_get_by_dev(dev, td->dm_dev.mode | FMODE_EXCL, _dm_claim_ptr); |
86f1152b BM |
766 | if (IS_ERR(bdev)) |
767 | return PTR_ERR(bdev); | |
768 | ||
769 | r = bd_link_disk_holder(bdev, dm_disk(md)); | |
770 | if (r) { | |
771 | blkdev_put(bdev, td->dm_dev.mode | FMODE_EXCL); | |
772 | return r; | |
773 | } | |
774 | ||
775 | td->dm_dev.bdev = bdev; | |
817bf402 | 776 | td->dm_dev.dax_dev = dax_get_by_host(bdev->bd_disk->disk_name); |
86f1152b BM |
777 | return 0; |
778 | } | |
779 | ||
780 | /* | |
781 | * Close a table device that we've been using. | |
782 | */ | |
783 | static void close_table_device(struct table_device *td, struct mapped_device *md) | |
784 | { | |
785 | if (!td->dm_dev.bdev) | |
786 | return; | |
787 | ||
788 | bd_unlink_disk_holder(td->dm_dev.bdev, dm_disk(md)); | |
789 | blkdev_put(td->dm_dev.bdev, td->dm_dev.mode | FMODE_EXCL); | |
817bf402 | 790 | put_dax(td->dm_dev.dax_dev); |
86f1152b | 791 | td->dm_dev.bdev = NULL; |
817bf402 | 792 | td->dm_dev.dax_dev = NULL; |
86f1152b BM |
793 | } |
794 | ||
795 | static struct table_device *find_table_device(struct list_head *l, dev_t dev, | |
8454fca4 SS |
796 | fmode_t mode) |
797 | { | |
86f1152b BM |
798 | struct table_device *td; |
799 | ||
800 | list_for_each_entry(td, l, list) | |
801 | if (td->dm_dev.bdev->bd_dev == dev && td->dm_dev.mode == mode) | |
802 | return td; | |
803 | ||
804 | return NULL; | |
805 | } | |
806 | ||
807 | int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode, | |
8454fca4 SS |
808 | struct dm_dev **result) |
809 | { | |
86f1152b BM |
810 | int r; |
811 | struct table_device *td; | |
812 | ||
813 | mutex_lock(&md->table_devices_lock); | |
814 | td = find_table_device(&md->table_devices, dev, mode); | |
815 | if (!td) { | |
115485e8 | 816 | td = kmalloc_node(sizeof(*td), GFP_KERNEL, md->numa_node_id); |
86f1152b BM |
817 | if (!td) { |
818 | mutex_unlock(&md->table_devices_lock); | |
819 | return -ENOMEM; | |
820 | } | |
821 | ||
822 | td->dm_dev.mode = mode; | |
823 | td->dm_dev.bdev = NULL; | |
824 | ||
825 | if ((r = open_table_device(td, dev, md))) { | |
826 | mutex_unlock(&md->table_devices_lock); | |
827 | kfree(td); | |
828 | return r; | |
829 | } | |
830 | ||
831 | format_dev_t(td->dm_dev.name, dev); | |
832 | ||
b0b4d7c6 | 833 | refcount_set(&td->count, 1); |
86f1152b | 834 | list_add(&td->list, &md->table_devices); |
b0b4d7c6 ER |
835 | } else { |
836 | refcount_inc(&td->count); | |
86f1152b | 837 | } |
86f1152b BM |
838 | mutex_unlock(&md->table_devices_lock); |
839 | ||
840 | *result = &td->dm_dev; | |
841 | return 0; | |
842 | } | |
843 | EXPORT_SYMBOL_GPL(dm_get_table_device); | |
844 | ||
845 | void dm_put_table_device(struct mapped_device *md, struct dm_dev *d) | |
846 | { | |
847 | struct table_device *td = container_of(d, struct table_device, dm_dev); | |
848 | ||
849 | mutex_lock(&md->table_devices_lock); | |
b0b4d7c6 | 850 | if (refcount_dec_and_test(&td->count)) { |
86f1152b BM |
851 | close_table_device(td, md); |
852 | list_del(&td->list); | |
853 | kfree(td); | |
854 | } | |
855 | mutex_unlock(&md->table_devices_lock); | |
856 | } | |
857 | EXPORT_SYMBOL(dm_put_table_device); | |
858 | ||
859 | static void free_table_devices(struct list_head *devices) | |
860 | { | |
861 | struct list_head *tmp, *next; | |
862 | ||
863 | list_for_each_safe(tmp, next, devices) { | |
864 | struct table_device *td = list_entry(tmp, struct table_device, list); | |
865 | ||
866 | DMWARN("dm_destroy: %s still exists with %d references", | |
b0b4d7c6 | 867 | td->dm_dev.name, refcount_read(&td->count)); |
86f1152b BM |
868 | kfree(td); |
869 | } | |
870 | } | |
871 | ||
3ac51e74 DW |
872 | /* |
873 | * Get the geometry associated with a dm device | |
874 | */ | |
875 | int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo) | |
876 | { | |
877 | *geo = md->geometry; | |
878 | ||
879 | return 0; | |
880 | } | |
881 | ||
882 | /* | |
883 | * Set the geometry of a device. | |
884 | */ | |
885 | int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo) | |
886 | { | |
887 | sector_t sz = (sector_t)geo->cylinders * geo->heads * geo->sectors; | |
888 | ||
889 | if (geo->start > sz) { | |
890 | DMWARN("Start sector is beyond the geometry limits."); | |
891 | return -EINVAL; | |
892 | } | |
893 | ||
894 | md->geometry = *geo; | |
895 | ||
896 | return 0; | |
897 | } | |
898 | ||
2e93ccc1 KU |
899 | static int __noflush_suspending(struct mapped_device *md) |
900 | { | |
901 | return test_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); | |
902 | } | |
903 | ||
1da177e4 LT |
904 | /* |
905 | * Decrements the number of outstanding ios that a bio has been | |
906 | * cloned into, completing the original io if necc. | |
907 | */ | |
4e4cbee9 | 908 | static void dec_pending(struct dm_io *io, blk_status_t error) |
1da177e4 | 909 | { |
2e93ccc1 | 910 | unsigned long flags; |
4e4cbee9 | 911 | blk_status_t io_error; |
b35f8caa MB |
912 | struct bio *bio; |
913 | struct mapped_device *md = io->md; | |
2e93ccc1 KU |
914 | |
915 | /* Push-back supersedes any I/O errors */ | |
f88fb981 KU |
916 | if (unlikely(error)) { |
917 | spin_lock_irqsave(&io->endio_lock, flags); | |
745dc570 | 918 | if (!(io->status == BLK_STS_DM_REQUEUE && __noflush_suspending(md))) |
4e4cbee9 | 919 | io->status = error; |
f88fb981 KU |
920 | spin_unlock_irqrestore(&io->endio_lock, flags); |
921 | } | |
1da177e4 LT |
922 | |
923 | if (atomic_dec_and_test(&io->io_count)) { | |
4e4cbee9 | 924 | if (io->status == BLK_STS_DM_REQUEUE) { |
2e93ccc1 KU |
925 | /* |
926 | * Target requested pushing back the I/O. | |
2e93ccc1 | 927 | */ |
022c2611 | 928 | spin_lock_irqsave(&md->deferred_lock, flags); |
6a8736d1 | 929 | if (__noflush_suspending(md)) |
745dc570 MS |
930 | /* NOTE early return due to BLK_STS_DM_REQUEUE below */ |
931 | bio_list_add_head(&md->deferred, io->orig_bio); | |
6a8736d1 | 932 | else |
2e93ccc1 | 933 | /* noflush suspend was interrupted. */ |
4e4cbee9 | 934 | io->status = BLK_STS_IOERR; |
022c2611 | 935 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
2e93ccc1 KU |
936 | } |
937 | ||
4e4cbee9 | 938 | io_error = io->status; |
745dc570 | 939 | bio = io->orig_bio; |
6a8736d1 TH |
940 | end_io_acct(io); |
941 | free_io(md, io); | |
942 | ||
4e4cbee9 | 943 | if (io_error == BLK_STS_DM_REQUEUE) |
6a8736d1 | 944 | return; |
2e93ccc1 | 945 | |
1eff9d32 | 946 | if ((bio->bi_opf & REQ_PREFLUSH) && bio->bi_iter.bi_size) { |
af7e466a | 947 | /* |
6a8736d1 | 948 | * Preflush done for flush with data, reissue |
28a8f0d3 | 949 | * without REQ_PREFLUSH. |
af7e466a | 950 | */ |
1eff9d32 | 951 | bio->bi_opf &= ~REQ_PREFLUSH; |
6a8736d1 | 952 | queue_io(md, bio); |
af7e466a | 953 | } else { |
b372d360 | 954 | /* done with normal IO or empty flush */ |
8dd601fa N |
955 | if (io_error) |
956 | bio->bi_status = io_error; | |
4246a0b6 | 957 | bio_endio(bio); |
b35f8caa | 958 | } |
1da177e4 LT |
959 | } |
960 | } | |
961 | ||
bcb44433 MS |
962 | void disable_discard(struct mapped_device *md) |
963 | { | |
964 | struct queue_limits *limits = dm_get_queue_limits(md); | |
965 | ||
966 | /* device doesn't really support DISCARD, disable it */ | |
967 | limits->max_discard_sectors = 0; | |
968 | blk_queue_flag_clear(QUEUE_FLAG_DISCARD, md->queue); | |
969 | } | |
970 | ||
4cc96131 | 971 | void disable_write_same(struct mapped_device *md) |
7eee4ae2 MS |
972 | { |
973 | struct queue_limits *limits = dm_get_queue_limits(md); | |
974 | ||
975 | /* device doesn't really support WRITE SAME, disable it */ | |
976 | limits->max_write_same_sectors = 0; | |
977 | } | |
978 | ||
ac62d620 CH |
979 | void disable_write_zeroes(struct mapped_device *md) |
980 | { | |
981 | struct queue_limits *limits = dm_get_queue_limits(md); | |
982 | ||
983 | /* device doesn't really support WRITE ZEROES, disable it */ | |
984 | limits->max_write_zeroes_sectors = 0; | |
985 | } | |
986 | ||
a666e5c0 MP |
987 | static bool swap_bios_limit(struct dm_target *ti, struct bio *bio) |
988 | { | |
989 | return unlikely((bio->bi_opf & REQ_SWAP) != 0) && unlikely(ti->limit_swap_bios); | |
990 | } | |
991 | ||
4246a0b6 | 992 | static void clone_endio(struct bio *bio) |
1da177e4 | 993 | { |
4e4cbee9 | 994 | blk_status_t error = bio->bi_status; |
bfc6d41c | 995 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); |
b35f8caa | 996 | struct dm_io *io = tio->io; |
9faf400f | 997 | struct mapped_device *md = tio->io->md; |
1da177e4 | 998 | dm_endio_fn endio = tio->ti->type->end_io; |
415c79e1 | 999 | struct bio *orig_bio = io->orig_bio; |
309dca30 | 1000 | struct request_queue *q = bio->bi_bdev->bd_disk->queue; |
1da177e4 | 1001 | |
9c37de29 | 1002 | if (unlikely(error == BLK_STS_TARGET)) { |
bcb44433 | 1003 | if (bio_op(bio) == REQ_OP_DISCARD && |
309dca30 | 1004 | !q->limits.max_discard_sectors) |
bcb44433 MS |
1005 | disable_discard(md); |
1006 | else if (bio_op(bio) == REQ_OP_WRITE_SAME && | |
309dca30 | 1007 | !q->limits.max_write_same_sectors) |
ac62d620 | 1008 | disable_write_same(md); |
bcb44433 | 1009 | else if (bio_op(bio) == REQ_OP_WRITE_ZEROES && |
309dca30 | 1010 | !q->limits.max_write_zeroes_sectors) |
ac62d620 CH |
1011 | disable_write_zeroes(md); |
1012 | } | |
7eee4ae2 | 1013 | |
415c79e1 JT |
1014 | /* |
1015 | * For zone-append bios get offset in zone of the written | |
1016 | * sector and add that to the original bio sector pos. | |
1017 | */ | |
1018 | if (bio_op(orig_bio) == REQ_OP_ZONE_APPEND) { | |
1019 | sector_t written_sector = bio->bi_iter.bi_sector; | |
309dca30 | 1020 | struct request_queue *q = orig_bio->bi_bdev->bd_disk->queue; |
415c79e1 JT |
1021 | u64 mask = (u64)blk_queue_zone_sectors(q) - 1; |
1022 | ||
1023 | orig_bio->bi_iter.bi_sector += written_sector & mask; | |
1024 | } | |
1025 | ||
1be56909 | 1026 | if (endio) { |
4e4cbee9 | 1027 | int r = endio(tio->ti, bio, &error); |
1be56909 CH |
1028 | switch (r) { |
1029 | case DM_ENDIO_REQUEUE: | |
4e4cbee9 | 1030 | error = BLK_STS_DM_REQUEUE; |
df561f66 | 1031 | fallthrough; |
1be56909 CH |
1032 | case DM_ENDIO_DONE: |
1033 | break; | |
1034 | case DM_ENDIO_INCOMPLETE: | |
1035 | /* The target will handle the io */ | |
1036 | return; | |
1037 | default: | |
1038 | DMWARN("unimplemented target endio return value: %d", r); | |
1039 | BUG(); | |
1040 | } | |
1041 | } | |
1042 | ||
a666e5c0 MP |
1043 | if (unlikely(swap_bios_limit(tio->ti, bio))) { |
1044 | struct mapped_device *md = io->md; | |
1045 | up(&md->swap_bios_semaphore); | |
1046 | } | |
1047 | ||
cfae7529 | 1048 | free_tio(tio); |
b35f8caa | 1049 | dec_pending(io, error); |
1da177e4 LT |
1050 | } |
1051 | ||
56a67df7 MS |
1052 | /* |
1053 | * Return maximum size of I/O possible at the supplied sector up to the current | |
1054 | * target boundary. | |
1055 | */ | |
3720281d MS |
1056 | static inline sector_t max_io_len_target_boundary(struct dm_target *ti, |
1057 | sector_t target_offset) | |
56a67df7 | 1058 | { |
56a67df7 MS |
1059 | return ti->len - target_offset; |
1060 | } | |
1061 | ||
3720281d | 1062 | static sector_t max_io_len(struct dm_target *ti, sector_t sector) |
1da177e4 | 1063 | { |
3720281d MS |
1064 | sector_t target_offset = dm_target_offset(ti, sector); |
1065 | sector_t len = max_io_len_target_boundary(ti, target_offset); | |
5091cdec | 1066 | sector_t max_len; |
1da177e4 LT |
1067 | |
1068 | /* | |
3ee16db3 MS |
1069 | * Does the target need to split IO even further? |
1070 | * - varied (per target) IO splitting is a tenet of DM; this | |
1071 | * explains why stacked chunk_sectors based splitting via | |
1072 | * blk_max_size_offset() isn't possible here. So pass in | |
1073 | * ti->max_io_len to override stacked chunk_sectors. | |
1da177e4 | 1074 | */ |
3ee16db3 MS |
1075 | if (ti->max_io_len) { |
1076 | max_len = blk_max_size_offset(ti->table->md->queue, | |
1077 | target_offset, ti->max_io_len); | |
1078 | if (len > max_len) | |
1079 | len = max_len; | |
1080 | } | |
1da177e4 LT |
1081 | |
1082 | return len; | |
1083 | } | |
1084 | ||
542f9038 MS |
1085 | int dm_set_target_max_io_len(struct dm_target *ti, sector_t len) |
1086 | { | |
1087 | if (len > UINT_MAX) { | |
1088 | DMERR("Specified maximum size of target IO (%llu) exceeds limit (%u)", | |
1089 | (unsigned long long)len, UINT_MAX); | |
1090 | ti->error = "Maximum size of target IO is too large"; | |
1091 | return -EINVAL; | |
1092 | } | |
1093 | ||
75ae1936 | 1094 | ti->max_io_len = (uint32_t) len; |
542f9038 MS |
1095 | |
1096 | return 0; | |
1097 | } | |
1098 | EXPORT_SYMBOL_GPL(dm_set_target_max_io_len); | |
1099 | ||
f26c5719 | 1100 | static struct dm_target *dm_dax_get_live_target(struct mapped_device *md, |
3d97c829 MS |
1101 | sector_t sector, int *srcu_idx) |
1102 | __acquires(md->io_barrier) | |
545ed20e | 1103 | { |
545ed20e TK |
1104 | struct dm_table *map; |
1105 | struct dm_target *ti; | |
545ed20e | 1106 | |
f26c5719 | 1107 | map = dm_get_live_table(md, srcu_idx); |
545ed20e | 1108 | if (!map) |
f26c5719 | 1109 | return NULL; |
545ed20e TK |
1110 | |
1111 | ti = dm_table_find_target(map, sector); | |
123d87d5 | 1112 | if (!ti) |
f26c5719 | 1113 | return NULL; |
545ed20e | 1114 | |
f26c5719 DW |
1115 | return ti; |
1116 | } | |
545ed20e | 1117 | |
f26c5719 | 1118 | static long dm_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, |
3d97c829 | 1119 | long nr_pages, void **kaddr, pfn_t *pfn) |
f26c5719 DW |
1120 | { |
1121 | struct mapped_device *md = dax_get_private(dax_dev); | |
1122 | sector_t sector = pgoff * PAGE_SECTORS; | |
1123 | struct dm_target *ti; | |
1124 | long len, ret = -EIO; | |
1125 | int srcu_idx; | |
545ed20e | 1126 | |
f26c5719 | 1127 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); |
545ed20e | 1128 | |
f26c5719 DW |
1129 | if (!ti) |
1130 | goto out; | |
1131 | if (!ti->type->direct_access) | |
1132 | goto out; | |
3720281d | 1133 | len = max_io_len(ti, sector) / PAGE_SECTORS; |
f26c5719 DW |
1134 | if (len < 1) |
1135 | goto out; | |
1136 | nr_pages = min(len, nr_pages); | |
dbc62659 | 1137 | ret = ti->type->direct_access(ti, pgoff, nr_pages, kaddr, pfn); |
817bf402 | 1138 | |
f26c5719 | 1139 | out: |
545ed20e | 1140 | dm_put_live_table(md, srcu_idx); |
f26c5719 DW |
1141 | |
1142 | return ret; | |
545ed20e TK |
1143 | } |
1144 | ||
7bf7eac8 DW |
1145 | static bool dm_dax_supported(struct dax_device *dax_dev, struct block_device *bdev, |
1146 | int blocksize, sector_t start, sector_t len) | |
1147 | { | |
1148 | struct mapped_device *md = dax_get_private(dax_dev); | |
1149 | struct dm_table *map; | |
02186d88 | 1150 | bool ret = false; |
7bf7eac8 | 1151 | int srcu_idx; |
7bf7eac8 DW |
1152 | |
1153 | map = dm_get_live_table(md, &srcu_idx); | |
1154 | if (!map) | |
02186d88 | 1155 | goto out; |
7bf7eac8 | 1156 | |
5b0fab50 | 1157 | ret = dm_table_supports_dax(map, device_not_dax_capable, &blocksize); |
7bf7eac8 | 1158 | |
02186d88 | 1159 | out: |
7bf7eac8 DW |
1160 | dm_put_live_table(md, srcu_idx); |
1161 | ||
1162 | return ret; | |
1163 | } | |
1164 | ||
7e026c8c | 1165 | static size_t dm_dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, |
3d97c829 | 1166 | void *addr, size_t bytes, struct iov_iter *i) |
7e026c8c DW |
1167 | { |
1168 | struct mapped_device *md = dax_get_private(dax_dev); | |
1169 | sector_t sector = pgoff * PAGE_SECTORS; | |
1170 | struct dm_target *ti; | |
1171 | long ret = 0; | |
1172 | int srcu_idx; | |
1173 | ||
1174 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); | |
1175 | ||
1176 | if (!ti) | |
1177 | goto out; | |
1178 | if (!ti->type->dax_copy_from_iter) { | |
1179 | ret = copy_from_iter(addr, bytes, i); | |
1180 | goto out; | |
1181 | } | |
1182 | ret = ti->type->dax_copy_from_iter(ti, pgoff, addr, bytes, i); | |
1183 | out: | |
1184 | dm_put_live_table(md, srcu_idx); | |
1185 | ||
1186 | return ret; | |
1187 | } | |
1188 | ||
b3a9a0c3 DW |
1189 | static size_t dm_dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, |
1190 | void *addr, size_t bytes, struct iov_iter *i) | |
1191 | { | |
1192 | struct mapped_device *md = dax_get_private(dax_dev); | |
1193 | sector_t sector = pgoff * PAGE_SECTORS; | |
1194 | struct dm_target *ti; | |
1195 | long ret = 0; | |
1196 | int srcu_idx; | |
1197 | ||
1198 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); | |
1199 | ||
1200 | if (!ti) | |
1201 | goto out; | |
1202 | if (!ti->type->dax_copy_to_iter) { | |
1203 | ret = copy_to_iter(addr, bytes, i); | |
1204 | goto out; | |
1205 | } | |
1206 | ret = ti->type->dax_copy_to_iter(ti, pgoff, addr, bytes, i); | |
1207 | out: | |
1208 | dm_put_live_table(md, srcu_idx); | |
1209 | ||
1210 | return ret; | |
1211 | } | |
1212 | ||
cdf6cdcd VG |
1213 | static int dm_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, |
1214 | size_t nr_pages) | |
1215 | { | |
1216 | struct mapped_device *md = dax_get_private(dax_dev); | |
1217 | sector_t sector = pgoff * PAGE_SECTORS; | |
1218 | struct dm_target *ti; | |
1219 | int ret = -EIO; | |
1220 | int srcu_idx; | |
1221 | ||
1222 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); | |
1223 | ||
1224 | if (!ti) | |
1225 | goto out; | |
1226 | if (WARN_ON(!ti->type->dax_zero_page_range)) { | |
1227 | /* | |
1228 | * ->zero_page_range() is mandatory dax operation. If we are | |
1229 | * here, something is wrong. | |
1230 | */ | |
cdf6cdcd VG |
1231 | goto out; |
1232 | } | |
1233 | ret = ti->type->dax_zero_page_range(ti, pgoff, nr_pages); | |
cdf6cdcd VG |
1234 | out: |
1235 | dm_put_live_table(md, srcu_idx); | |
1236 | ||
1237 | return ret; | |
1238 | } | |
1239 | ||
1dd40c3e MP |
1240 | /* |
1241 | * A target may call dm_accept_partial_bio only from the map routine. It is | |
2e2d6f7e AJ |
1242 | * allowed for all bio types except REQ_PREFLUSH, REQ_OP_ZONE_RESET, |
1243 | * REQ_OP_ZONE_OPEN, REQ_OP_ZONE_CLOSE and REQ_OP_ZONE_FINISH. | |
1dd40c3e MP |
1244 | * |
1245 | * dm_accept_partial_bio informs the dm that the target only wants to process | |
1246 | * additional n_sectors sectors of the bio and the rest of the data should be | |
1247 | * sent in a next bio. | |
1248 | * | |
1249 | * A diagram that explains the arithmetics: | |
1250 | * +--------------------+---------------+-------+ | |
1251 | * | 1 | 2 | 3 | | |
1252 | * +--------------------+---------------+-------+ | |
1253 | * | |
1254 | * <-------------- *tio->len_ptr ---------------> | |
1255 | * <------- bi_size -------> | |
1256 | * <-- n_sectors --> | |
1257 | * | |
1258 | * Region 1 was already iterated over with bio_advance or similar function. | |
1259 | * (it may be empty if the target doesn't use bio_advance) | |
1260 | * Region 2 is the remaining bio size that the target wants to process. | |
1261 | * (it may be empty if region 1 is non-empty, although there is no reason | |
1262 | * to make it empty) | |
1263 | * The target requires that region 3 is to be sent in the next bio. | |
1264 | * | |
1265 | * If the target wants to receive multiple copies of the bio (via num_*bios, etc), | |
1266 | * the partially processed part (the sum of regions 1+2) must be the same for all | |
1267 | * copies of the bio. | |
1268 | */ | |
1269 | void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors) | |
1270 | { | |
1271 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); | |
1272 | unsigned bi_size = bio->bi_iter.bi_size >> SECTOR_SHIFT; | |
1eff9d32 | 1273 | BUG_ON(bio->bi_opf & REQ_PREFLUSH); |
1dd40c3e MP |
1274 | BUG_ON(bi_size > *tio->len_ptr); |
1275 | BUG_ON(n_sectors > bi_size); | |
1276 | *tio->len_ptr -= bi_size - n_sectors; | |
1277 | bio->bi_iter.bi_size = n_sectors << SECTOR_SHIFT; | |
1278 | } | |
1279 | EXPORT_SYMBOL_GPL(dm_accept_partial_bio); | |
1280 | ||
a666e5c0 MP |
1281 | static noinline void __set_swap_bios_limit(struct mapped_device *md, int latch) |
1282 | { | |
1283 | mutex_lock(&md->swap_bios_lock); | |
1284 | while (latch < md->swap_bios) { | |
1285 | cond_resched(); | |
1286 | down(&md->swap_bios_semaphore); | |
1287 | md->swap_bios--; | |
1288 | } | |
1289 | while (latch > md->swap_bios) { | |
1290 | cond_resched(); | |
1291 | up(&md->swap_bios_semaphore); | |
1292 | md->swap_bios++; | |
1293 | } | |
1294 | mutex_unlock(&md->swap_bios_lock); | |
1295 | } | |
1296 | ||
978e51ba | 1297 | static blk_qc_t __map_bio(struct dm_target_io *tio) |
1da177e4 LT |
1298 | { |
1299 | int r; | |
2056a782 | 1300 | sector_t sector; |
dba14160 | 1301 | struct bio *clone = &tio->clone; |
64f52b0e | 1302 | struct dm_io *io = tio->io; |
bd2a49b8 | 1303 | struct dm_target *ti = tio->ti; |
978e51ba | 1304 | blk_qc_t ret = BLK_QC_T_NONE; |
1da177e4 | 1305 | |
1da177e4 | 1306 | clone->bi_end_io = clone_endio; |
1da177e4 LT |
1307 | |
1308 | /* | |
1309 | * Map the clone. If r == 0 we don't need to do | |
1310 | * anything, the target has assumed ownership of | |
1311 | * this io. | |
1312 | */ | |
64f52b0e | 1313 | atomic_inc(&io->io_count); |
4f024f37 | 1314 | sector = clone->bi_iter.bi_sector; |
d67a5f4b | 1315 | |
a666e5c0 MP |
1316 | if (unlikely(swap_bios_limit(ti, clone))) { |
1317 | struct mapped_device *md = io->md; | |
1318 | int latch = get_swap_bios(); | |
1319 | if (unlikely(latch != md->swap_bios)) | |
1320 | __set_swap_bios_limit(md, latch); | |
1321 | down(&md->swap_bios_semaphore); | |
1322 | } | |
1323 | ||
7de3ee57 | 1324 | r = ti->type->map(ti, clone); |
846785e6 CH |
1325 | switch (r) { |
1326 | case DM_MAPIO_SUBMITTED: | |
1327 | break; | |
1328 | case DM_MAPIO_REMAPPED: | |
1da177e4 | 1329 | /* the bio has been remapped so dispatch it */ |
1c02fca6 | 1330 | trace_block_bio_remap(clone, bio_dev(io->orig_bio), sector); |
5a6c35f9 | 1331 | ret = submit_bio_noacct(clone); |
846785e6 CH |
1332 | break; |
1333 | case DM_MAPIO_KILL: | |
a666e5c0 MP |
1334 | if (unlikely(swap_bios_limit(ti, clone))) { |
1335 | struct mapped_device *md = io->md; | |
1336 | up(&md->swap_bios_semaphore); | |
1337 | } | |
4e4cbee9 | 1338 | free_tio(tio); |
64f52b0e | 1339 | dec_pending(io, BLK_STS_IOERR); |
4e4cbee9 | 1340 | break; |
846785e6 | 1341 | case DM_MAPIO_REQUEUE: |
a666e5c0 MP |
1342 | if (unlikely(swap_bios_limit(ti, clone))) { |
1343 | struct mapped_device *md = io->md; | |
1344 | up(&md->swap_bios_semaphore); | |
1345 | } | |
cfae7529 | 1346 | free_tio(tio); |
64f52b0e | 1347 | dec_pending(io, BLK_STS_DM_REQUEUE); |
846785e6 CH |
1348 | break; |
1349 | default: | |
45cbcd79 KU |
1350 | DMWARN("unimplemented target map return value: %d", r); |
1351 | BUG(); | |
1da177e4 | 1352 | } |
1da177e4 | 1353 | |
978e51ba | 1354 | return ret; |
1da177e4 | 1355 | } |
1da177e4 | 1356 | |
e0d6609a | 1357 | static void bio_setup_sector(struct bio *bio, sector_t sector, unsigned len) |
bd2a49b8 | 1358 | { |
4f024f37 KO |
1359 | bio->bi_iter.bi_sector = sector; |
1360 | bio->bi_iter.bi_size = to_bytes(len); | |
1da177e4 LT |
1361 | } |
1362 | ||
1363 | /* | |
1364 | * Creates a bio that consists of range of complete bvecs. | |
1365 | */ | |
c80914e8 MS |
1366 | static int clone_bio(struct dm_target_io *tio, struct bio *bio, |
1367 | sector_t sector, unsigned len) | |
1da177e4 | 1368 | { |
dba14160 | 1369 | struct bio *clone = &tio->clone; |
07560151 | 1370 | int r; |
1da177e4 | 1371 | |
1c3b13e6 KO |
1372 | __bio_clone_fast(clone, bio); |
1373 | ||
07560151 EB |
1374 | r = bio_crypt_clone(clone, bio, GFP_NOIO); |
1375 | if (r < 0) | |
1376 | return r; | |
a892c8d5 | 1377 | |
57c36519 | 1378 | if (bio_integrity(bio)) { |
e2460f2a MP |
1379 | if (unlikely(!dm_target_has_integrity(tio->ti->type) && |
1380 | !dm_target_passes_integrity(tio->ti->type))) { | |
1381 | DMWARN("%s: the target %s doesn't support integrity data.", | |
1382 | dm_device_name(tio->io->md), | |
1383 | tio->ti->type->name); | |
1384 | return -EIO; | |
1385 | } | |
1386 | ||
1387 | r = bio_integrity_clone(clone, bio, GFP_NOIO); | |
c80914e8 MS |
1388 | if (r < 0) |
1389 | return r; | |
1390 | } | |
bd2a49b8 | 1391 | |
fa8db494 MS |
1392 | bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector)); |
1393 | clone->bi_iter.bi_size = to_bytes(len); | |
1394 | ||
1395 | if (bio_integrity(bio)) | |
1396 | bio_integrity_trim(clone); | |
c80914e8 MS |
1397 | |
1398 | return 0; | |
1da177e4 LT |
1399 | } |
1400 | ||
318716dd MS |
1401 | static void alloc_multiple_bios(struct bio_list *blist, struct clone_info *ci, |
1402 | struct dm_target *ti, unsigned num_bios) | |
f9ab94ce | 1403 | { |
dba14160 | 1404 | struct dm_target_io *tio; |
318716dd | 1405 | int try; |
dba14160 | 1406 | |
318716dd MS |
1407 | if (!num_bios) |
1408 | return; | |
f9ab94ce | 1409 | |
318716dd MS |
1410 | if (num_bios == 1) { |
1411 | tio = alloc_tio(ci, ti, 0, GFP_NOIO); | |
1412 | bio_list_add(blist, &tio->clone); | |
1413 | return; | |
1414 | } | |
9015df24 | 1415 | |
318716dd MS |
1416 | for (try = 0; try < 2; try++) { |
1417 | int bio_nr; | |
1418 | struct bio *bio; | |
1419 | ||
1420 | if (try) | |
bc02cdbe | 1421 | mutex_lock(&ci->io->md->table_devices_lock); |
318716dd MS |
1422 | for (bio_nr = 0; bio_nr < num_bios; bio_nr++) { |
1423 | tio = alloc_tio(ci, ti, bio_nr, try ? GFP_NOIO : GFP_NOWAIT); | |
1424 | if (!tio) | |
1425 | break; | |
1426 | ||
1427 | bio_list_add(blist, &tio->clone); | |
1428 | } | |
1429 | if (try) | |
bc02cdbe | 1430 | mutex_unlock(&ci->io->md->table_devices_lock); |
318716dd MS |
1431 | if (bio_nr == num_bios) |
1432 | return; | |
1433 | ||
1434 | while ((bio = bio_list_pop(blist))) { | |
1435 | tio = container_of(bio, struct dm_target_io, clone); | |
1436 | free_tio(tio); | |
1437 | } | |
1438 | } | |
9015df24 AK |
1439 | } |
1440 | ||
978e51ba MS |
1441 | static blk_qc_t __clone_and_map_simple_bio(struct clone_info *ci, |
1442 | struct dm_target_io *tio, unsigned *len) | |
9015df24 | 1443 | { |
dba14160 | 1444 | struct bio *clone = &tio->clone; |
9015df24 | 1445 | |
1dd40c3e MP |
1446 | tio->len_ptr = len; |
1447 | ||
99778273 | 1448 | __bio_clone_fast(clone, ci->bio); |
bd2a49b8 | 1449 | if (len) |
1dd40c3e | 1450 | bio_setup_sector(clone, ci->sector, *len); |
f9ab94ce | 1451 | |
978e51ba | 1452 | return __map_bio(tio); |
f9ab94ce MP |
1453 | } |
1454 | ||
14fe594d | 1455 | static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti, |
1dd40c3e | 1456 | unsigned num_bios, unsigned *len) |
06a426ce | 1457 | { |
318716dd MS |
1458 | struct bio_list blist = BIO_EMPTY_LIST; |
1459 | struct bio *bio; | |
1460 | struct dm_target_io *tio; | |
1461 | ||
1462 | alloc_multiple_bios(&blist, ci, ti, num_bios); | |
06a426ce | 1463 | |
318716dd MS |
1464 | while ((bio = bio_list_pop(&blist))) { |
1465 | tio = container_of(bio, struct dm_target_io, clone); | |
978e51ba | 1466 | (void) __clone_and_map_simple_bio(ci, tio, len); |
318716dd | 1467 | } |
06a426ce MS |
1468 | } |
1469 | ||
14fe594d | 1470 | static int __send_empty_flush(struct clone_info *ci) |
f9ab94ce | 1471 | { |
06a426ce | 1472 | unsigned target_nr = 0; |
f9ab94ce | 1473 | struct dm_target *ti; |
828678b8 MS |
1474 | struct bio flush_bio; |
1475 | ||
1476 | /* | |
1477 | * Use an on-stack bio for this, it's safe since we don't | |
1478 | * need to reference it after submit. It's just used as | |
1479 | * the basis for the clone(s). | |
1480 | */ | |
1481 | bio_init(&flush_bio, NULL, 0); | |
1482 | flush_bio.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC; | |
309dca30 | 1483 | bio_set_dev(&flush_bio, ci->io->md->disk->part0); |
47d95102 | 1484 | |
828678b8 MS |
1485 | ci->bio = &flush_bio; |
1486 | ci->sector_count = 0; | |
f9ab94ce | 1487 | |
b372d360 | 1488 | BUG_ON(bio_has_data(ci->bio)); |
f9ab94ce | 1489 | while ((ti = dm_table_get_target(ci->map, target_nr++))) |
1dd40c3e | 1490 | __send_duplicate_bios(ci, ti, ti->num_flush_bios, NULL); |
828678b8 MS |
1491 | |
1492 | bio_uninit(ci->bio); | |
f9ab94ce MP |
1493 | return 0; |
1494 | } | |
1495 | ||
c80914e8 | 1496 | static int __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti, |
f31c21e4 | 1497 | sector_t sector, unsigned *len) |
5ae89a87 | 1498 | { |
dba14160 | 1499 | struct bio *bio = ci->bio; |
5ae89a87 | 1500 | struct dm_target_io *tio; |
f31c21e4 | 1501 | int r; |
5ae89a87 | 1502 | |
318716dd | 1503 | tio = alloc_tio(ci, ti, 0, GFP_NOIO); |
f31c21e4 N |
1504 | tio->len_ptr = len; |
1505 | r = clone_bio(tio, bio, sector, *len); | |
1506 | if (r < 0) { | |
1507 | free_tio(tio); | |
1508 | return r; | |
b0d8ed4d | 1509 | } |
978e51ba | 1510 | (void) __map_bio(tio); |
c80914e8 | 1511 | |
f31c21e4 | 1512 | return 0; |
5ae89a87 MS |
1513 | } |
1514 | ||
3d7f4562 | 1515 | static int __send_changing_extent_only(struct clone_info *ci, struct dm_target *ti, |
61697a6a | 1516 | unsigned num_bios) |
ba1cbad9 | 1517 | { |
51b86f9a | 1518 | unsigned len; |
ba1cbad9 | 1519 | |
3d7f4562 MS |
1520 | /* |
1521 | * Even though the device advertised support for this type of | |
1522 | * request, that does not mean every target supports it, and | |
1523 | * reconfiguration might also have changed that since the | |
1524 | * check was performed. | |
1525 | */ | |
3d7f4562 MS |
1526 | if (!num_bios) |
1527 | return -EOPNOTSUPP; | |
ba1cbad9 | 1528 | |
3720281d MS |
1529 | len = min_t(sector_t, ci->sector_count, |
1530 | max_io_len_target_boundary(ti, dm_target_offset(ti, ci->sector))); | |
51b86f9a | 1531 | |
3d7f4562 | 1532 | __send_duplicate_bios(ci, ti, num_bios, &len); |
e262f347 | 1533 | |
3d7f4562 MS |
1534 | ci->sector += len; |
1535 | ci->sector_count -= len; | |
5ae89a87 MS |
1536 | |
1537 | return 0; | |
ba1cbad9 MS |
1538 | } |
1539 | ||
568c73a3 MS |
1540 | static bool is_abnormal_io(struct bio *bio) |
1541 | { | |
1542 | bool r = false; | |
1543 | ||
1544 | switch (bio_op(bio)) { | |
1545 | case REQ_OP_DISCARD: | |
1546 | case REQ_OP_SECURE_ERASE: | |
1547 | case REQ_OP_WRITE_SAME: | |
1548 | case REQ_OP_WRITE_ZEROES: | |
1549 | r = true; | |
1550 | break; | |
1551 | } | |
1552 | ||
1553 | return r; | |
1554 | } | |
1555 | ||
0519c71e MS |
1556 | static bool __process_abnormal_io(struct clone_info *ci, struct dm_target *ti, |
1557 | int *result) | |
1558 | { | |
1559 | struct bio *bio = ci->bio; | |
9679b5a7 | 1560 | unsigned num_bios = 0; |
0519c71e | 1561 | |
9679b5a7 MS |
1562 | switch (bio_op(bio)) { |
1563 | case REQ_OP_DISCARD: | |
1564 | num_bios = ti->num_discard_bios; | |
1565 | break; | |
1566 | case REQ_OP_SECURE_ERASE: | |
1567 | num_bios = ti->num_secure_erase_bios; | |
1568 | break; | |
1569 | case REQ_OP_WRITE_SAME: | |
1570 | num_bios = ti->num_write_same_bios; | |
1571 | break; | |
1572 | case REQ_OP_WRITE_ZEROES: | |
1573 | num_bios = ti->num_write_zeroes_bios; | |
1574 | break; | |
1575 | default: | |
0519c71e | 1576 | return false; |
9679b5a7 | 1577 | } |
0519c71e | 1578 | |
9679b5a7 | 1579 | *result = __send_changing_extent_only(ci, ti, num_bios); |
0519c71e MS |
1580 | return true; |
1581 | } | |
1582 | ||
e4c93811 AK |
1583 | /* |
1584 | * Select the correct strategy for processing a non-flush bio. | |
1585 | */ | |
14fe594d | 1586 | static int __split_and_process_non_flush(struct clone_info *ci) |
0ce65797 | 1587 | { |
512875bd | 1588 | struct dm_target *ti; |
1c3b13e6 | 1589 | unsigned len; |
c80914e8 | 1590 | int r; |
0ce65797 | 1591 | |
512875bd | 1592 | ti = dm_table_find_target(ci->map, ci->sector); |
123d87d5 | 1593 | if (!ti) |
512875bd JN |
1594 | return -EIO; |
1595 | ||
568c73a3 | 1596 | if (__process_abnormal_io(ci, ti, &r)) |
0519c71e | 1597 | return r; |
3d7f4562 | 1598 | |
3720281d | 1599 | len = min_t(sector_t, max_io_len(ti, ci->sector), ci->sector_count); |
0ce65797 | 1600 | |
c80914e8 MS |
1601 | r = __clone_and_map_data_bio(ci, ti, ci->sector, &len); |
1602 | if (r < 0) | |
1603 | return r; | |
0ce65797 | 1604 | |
1c3b13e6 KO |
1605 | ci->sector += len; |
1606 | ci->sector_count -= len; | |
0ce65797 | 1607 | |
1c3b13e6 | 1608 | return 0; |
0ce65797 MS |
1609 | } |
1610 | ||
978e51ba MS |
1611 | static void init_clone_info(struct clone_info *ci, struct mapped_device *md, |
1612 | struct dm_table *map, struct bio *bio) | |
1613 | { | |
1614 | ci->map = map; | |
1615 | ci->io = alloc_io(md, bio); | |
1616 | ci->sector = bio->bi_iter.bi_sector; | |
1617 | } | |
1618 | ||
a1e1cb72 MS |
1619 | #define __dm_part_stat_sub(part, field, subnd) \ |
1620 | (part_stat_get(part, field) -= (subnd)) | |
1621 | ||
1da177e4 | 1622 | /* |
14fe594d | 1623 | * Entry point to split a bio into clones and submit them to the targets. |
1da177e4 | 1624 | */ |
978e51ba MS |
1625 | static blk_qc_t __split_and_process_bio(struct mapped_device *md, |
1626 | struct dm_table *map, struct bio *bio) | |
0ce65797 | 1627 | { |
1da177e4 | 1628 | struct clone_info ci; |
978e51ba | 1629 | blk_qc_t ret = BLK_QC_T_NONE; |
512875bd | 1630 | int error = 0; |
1da177e4 | 1631 | |
978e51ba | 1632 | init_clone_info(&ci, md, map, bio); |
0ce65797 | 1633 | |
1eff9d32 | 1634 | if (bio->bi_opf & REQ_PREFLUSH) { |
14fe594d | 1635 | error = __send_empty_flush(&ci); |
b372d360 | 1636 | /* dec_pending submits any data associated with flush */ |
2e2d6f7e | 1637 | } else if (op_is_zone_mgmt(bio_op(bio))) { |
a4aa5e56 DLM |
1638 | ci.bio = bio; |
1639 | ci.sector_count = 0; | |
1640 | error = __split_and_process_non_flush(&ci); | |
b372d360 | 1641 | } else { |
6a8736d1 | 1642 | ci.bio = bio; |
d87f4c14 | 1643 | ci.sector_count = bio_sectors(bio); |
18a25da8 | 1644 | while (ci.sector_count && !error) { |
14fe594d | 1645 | error = __split_and_process_non_flush(&ci); |
985eabdc | 1646 | if (ci.sector_count && !error) { |
18a25da8 | 1647 | /* |
ed00aabd | 1648 | * Remainder must be passed to submit_bio_noacct() |
18a25da8 N |
1649 | * so that it gets handled *after* bios already submitted |
1650 | * have been completely processed. | |
1651 | * We take a clone of the original to store in | |
745dc570 | 1652 | * ci.io->orig_bio to be used by end_io_acct() and |
18a25da8 | 1653 | * for dec_pending to use for completion handling. |
18a25da8 | 1654 | */ |
f21c601a MS |
1655 | struct bio *b = bio_split(bio, bio_sectors(bio) - ci.sector_count, |
1656 | GFP_NOIO, &md->queue->bio_split); | |
745dc570 | 1657 | ci.io->orig_bio = b; |
a1e1cb72 MS |
1658 | |
1659 | /* | |
1660 | * Adjust IO stats for each split, otherwise upon queue | |
1661 | * reentry there will be redundant IO accounting. | |
1662 | * NOTE: this is a stop-gap fix, a proper fix involves | |
1663 | * significant refactoring of DM core's bio splitting | |
1664 | * (by eliminating DM's splitting and just using bio_split) | |
1665 | */ | |
1666 | part_stat_lock(); | |
8446fe92 | 1667 | __dm_part_stat_sub(dm_disk(md)->part0, |
a1e1cb72 MS |
1668 | sectors[op_stat_group(bio_op(bio))], ci.sector_count); |
1669 | part_stat_unlock(); | |
1670 | ||
18a25da8 | 1671 | bio_chain(b, bio); |
eb6f7f7c | 1672 | trace_block_split(b, bio->bi_iter.bi_sector); |
ed00aabd | 1673 | ret = submit_bio_noacct(bio); |
18a25da8 N |
1674 | break; |
1675 | } | |
1676 | } | |
d87f4c14 | 1677 | } |
0ce65797 | 1678 | |
1da177e4 | 1679 | /* drop the extra reference count */ |
54385bf7 | 1680 | dec_pending(ci.io, errno_to_blk_status(error)); |
978e51ba | 1681 | return ret; |
0ce65797 MS |
1682 | } |
1683 | ||
c62b37d9 | 1684 | static blk_qc_t dm_submit_bio(struct bio *bio) |
cec47e3d | 1685 | { |
309dca30 | 1686 | struct mapped_device *md = bio->bi_bdev->bd_disk->private_data; |
978e51ba | 1687 | blk_qc_t ret = BLK_QC_T_NONE; |
83d5e5b0 MP |
1688 | int srcu_idx; |
1689 | struct dm_table *map; | |
cec47e3d | 1690 | |
83d5e5b0 | 1691 | map = dm_get_live_table(md, &srcu_idx); |
b2abdb1b MS |
1692 | if (unlikely(!map)) { |
1693 | DMERR_LIMIT("%s: mapping table unavailable, erroring io", | |
1694 | dm_device_name(md)); | |
1695 | bio_io_error(bio); | |
1696 | goto out; | |
1697 | } | |
29e4013d | 1698 | |
b2abdb1b | 1699 | /* If suspended, queue this IO for later */ |
6a8736d1 | 1700 | if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags))) { |
6abc4946 KK |
1701 | if (bio->bi_opf & REQ_NOWAIT) |
1702 | bio_wouldblock_error(bio); | |
b2abdb1b | 1703 | else if (bio->bi_opf & REQ_RAHEAD) |
54d9a1b4 | 1704 | bio_io_error(bio); |
b2abdb1b MS |
1705 | else |
1706 | queue_io(md, bio); | |
1707 | goto out; | |
cec47e3d | 1708 | } |
1da177e4 | 1709 | |
b2abdb1b MS |
1710 | /* |
1711 | * Use blk_queue_split() for abnormal IO (e.g. discard, writesame, etc) | |
1712 | * otherwise associated queue_limits won't be imposed. | |
1713 | */ | |
1714 | if (is_abnormal_io(bio)) | |
1715 | blk_queue_split(&bio); | |
978e51ba | 1716 | |
9c37de29 | 1717 | ret = __split_and_process_bio(md, map, bio); |
b2abdb1b | 1718 | out: |
83d5e5b0 | 1719 | dm_put_live_table(md, srcu_idx); |
978e51ba MS |
1720 | return ret; |
1721 | } | |
1722 | ||
1da177e4 LT |
1723 | /*----------------------------------------------------------------- |
1724 | * An IDR is used to keep track of allocated minor numbers. | |
1725 | *---------------------------------------------------------------*/ | |
2b06cfff | 1726 | static void free_minor(int minor) |
1da177e4 | 1727 | { |
f32c10b0 | 1728 | spin_lock(&_minor_lock); |
1da177e4 | 1729 | idr_remove(&_minor_idr, minor); |
f32c10b0 | 1730 | spin_unlock(&_minor_lock); |
1da177e4 LT |
1731 | } |
1732 | ||
1733 | /* | |
1734 | * See if the device with a specific minor # is free. | |
1735 | */ | |
cf13ab8e | 1736 | static int specific_minor(int minor) |
1da177e4 | 1737 | { |
c9d76be6 | 1738 | int r; |
1da177e4 LT |
1739 | |
1740 | if (minor >= (1 << MINORBITS)) | |
1741 | return -EINVAL; | |
1742 | ||
c9d76be6 | 1743 | idr_preload(GFP_KERNEL); |
f32c10b0 | 1744 | spin_lock(&_minor_lock); |
1da177e4 | 1745 | |
c9d76be6 | 1746 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, minor, minor + 1, GFP_NOWAIT); |
1da177e4 | 1747 | |
f32c10b0 | 1748 | spin_unlock(&_minor_lock); |
c9d76be6 TH |
1749 | idr_preload_end(); |
1750 | if (r < 0) | |
1751 | return r == -ENOSPC ? -EBUSY : r; | |
1752 | return 0; | |
1da177e4 LT |
1753 | } |
1754 | ||
cf13ab8e | 1755 | static int next_free_minor(int *minor) |
1da177e4 | 1756 | { |
c9d76be6 | 1757 | int r; |
62f75c2f | 1758 | |
c9d76be6 | 1759 | idr_preload(GFP_KERNEL); |
f32c10b0 | 1760 | spin_lock(&_minor_lock); |
1da177e4 | 1761 | |
c9d76be6 | 1762 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, 0, 1 << MINORBITS, GFP_NOWAIT); |
1da177e4 | 1763 | |
f32c10b0 | 1764 | spin_unlock(&_minor_lock); |
c9d76be6 TH |
1765 | idr_preload_end(); |
1766 | if (r < 0) | |
1767 | return r; | |
1768 | *minor = r; | |
1769 | return 0; | |
1da177e4 LT |
1770 | } |
1771 | ||
83d5cde4 | 1772 | static const struct block_device_operations dm_blk_dops; |
681cc5e8 | 1773 | static const struct block_device_operations dm_rq_blk_dops; |
f26c5719 | 1774 | static const struct dax_operations dm_dax_ops; |
1da177e4 | 1775 | |
53d5914f MP |
1776 | static void dm_wq_work(struct work_struct *work); |
1777 | ||
aa6ce87a ST |
1778 | #ifdef CONFIG_BLK_INLINE_ENCRYPTION |
1779 | static void dm_queue_destroy_keyslot_manager(struct request_queue *q) | |
1780 | { | |
1781 | dm_destroy_keyslot_manager(q->ksm); | |
1782 | } | |
1783 | ||
1784 | #else /* CONFIG_BLK_INLINE_ENCRYPTION */ | |
1785 | ||
1786 | static inline void dm_queue_destroy_keyslot_manager(struct request_queue *q) | |
1787 | { | |
1788 | } | |
1789 | #endif /* !CONFIG_BLK_INLINE_ENCRYPTION */ | |
1790 | ||
0f20972f MS |
1791 | static void cleanup_mapped_device(struct mapped_device *md) |
1792 | { | |
0f20972f MS |
1793 | if (md->wq) |
1794 | destroy_workqueue(md->wq); | |
6f1c819c KO |
1795 | bioset_exit(&md->bs); |
1796 | bioset_exit(&md->io_bs); | |
0f20972f | 1797 | |
f26c5719 DW |
1798 | if (md->dax_dev) { |
1799 | kill_dax(md->dax_dev); | |
1800 | put_dax(md->dax_dev); | |
1801 | md->dax_dev = NULL; | |
1802 | } | |
1803 | ||
0f20972f MS |
1804 | if (md->disk) { |
1805 | spin_lock(&_minor_lock); | |
1806 | md->disk->private_data = NULL; | |
1807 | spin_unlock(&_minor_lock); | |
0f20972f MS |
1808 | del_gendisk(md->disk); |
1809 | put_disk(md->disk); | |
1810 | } | |
1811 | ||
aa6ce87a ST |
1812 | if (md->queue) { |
1813 | dm_queue_destroy_keyslot_manager(md->queue); | |
0f20972f | 1814 | blk_cleanup_queue(md->queue); |
aa6ce87a | 1815 | } |
0f20972f | 1816 | |
d09960b0 TE |
1817 | cleanup_srcu_struct(&md->io_barrier); |
1818 | ||
d5ffebdd MS |
1819 | mutex_destroy(&md->suspend_lock); |
1820 | mutex_destroy(&md->type_lock); | |
1821 | mutex_destroy(&md->table_devices_lock); | |
a666e5c0 | 1822 | mutex_destroy(&md->swap_bios_lock); |
d5ffebdd | 1823 | |
4cc96131 | 1824 | dm_mq_cleanup_mapped_device(md); |
0f20972f MS |
1825 | } |
1826 | ||
1da177e4 LT |
1827 | /* |
1828 | * Allocate and initialise a blank device with a given minor. | |
1829 | */ | |
2b06cfff | 1830 | static struct mapped_device *alloc_dev(int minor) |
1da177e4 | 1831 | { |
115485e8 MS |
1832 | int r, numa_node_id = dm_get_numa_node(); |
1833 | struct mapped_device *md; | |
ba61fdd1 | 1834 | void *old_md; |
1da177e4 | 1835 | |
856eb091 | 1836 | md = kvzalloc_node(sizeof(*md), GFP_KERNEL, numa_node_id); |
1da177e4 LT |
1837 | if (!md) { |
1838 | DMWARN("unable to allocate device, out of memory."); | |
1839 | return NULL; | |
1840 | } | |
1841 | ||
10da4f79 | 1842 | if (!try_module_get(THIS_MODULE)) |
6ed7ade8 | 1843 | goto bad_module_get; |
10da4f79 | 1844 | |
1da177e4 | 1845 | /* get a minor number for the dev */ |
2b06cfff | 1846 | if (minor == DM_ANY_MINOR) |
cf13ab8e | 1847 | r = next_free_minor(&minor); |
2b06cfff | 1848 | else |
cf13ab8e | 1849 | r = specific_minor(minor); |
1da177e4 | 1850 | if (r < 0) |
6ed7ade8 | 1851 | goto bad_minor; |
1da177e4 | 1852 | |
83d5e5b0 MP |
1853 | r = init_srcu_struct(&md->io_barrier); |
1854 | if (r < 0) | |
1855 | goto bad_io_barrier; | |
1856 | ||
115485e8 | 1857 | md->numa_node_id = numa_node_id; |
591ddcfc | 1858 | md->init_tio_pdu = false; |
a5664dad | 1859 | md->type = DM_TYPE_NONE; |
e61290a4 | 1860 | mutex_init(&md->suspend_lock); |
a5664dad | 1861 | mutex_init(&md->type_lock); |
86f1152b | 1862 | mutex_init(&md->table_devices_lock); |
022c2611 | 1863 | spin_lock_init(&md->deferred_lock); |
1da177e4 | 1864 | atomic_set(&md->holders, 1); |
5c6bd75d | 1865 | atomic_set(&md->open_count, 0); |
1da177e4 | 1866 | atomic_set(&md->event_nr, 0); |
7a8c3d3b MA |
1867 | atomic_set(&md->uevent_seq, 0); |
1868 | INIT_LIST_HEAD(&md->uevent_list); | |
86f1152b | 1869 | INIT_LIST_HEAD(&md->table_devices); |
7a8c3d3b | 1870 | spin_lock_init(&md->uevent_lock); |
1da177e4 | 1871 | |
47ace7e0 | 1872 | /* |
c62b37d9 CH |
1873 | * default to bio-based until DM table is loaded and md->type |
1874 | * established. If request-based table is loaded: blk-mq will | |
1875 | * override accordingly. | |
47ace7e0 | 1876 | */ |
c62b37d9 | 1877 | md->queue = blk_alloc_queue(numa_node_id); |
3d745ea5 CH |
1878 | if (!md->queue) |
1879 | goto bad; | |
1da177e4 | 1880 | |
c12c9a3c | 1881 | md->disk = alloc_disk_node(1, md->numa_node_id); |
1da177e4 | 1882 | if (!md->disk) |
0f20972f | 1883 | goto bad; |
1da177e4 | 1884 | |
f0b04115 | 1885 | init_waitqueue_head(&md->wait); |
53d5914f | 1886 | INIT_WORK(&md->work, dm_wq_work); |
f0b04115 | 1887 | init_waitqueue_head(&md->eventq); |
2995fa78 | 1888 | init_completion(&md->kobj_holder.completion); |
f0b04115 | 1889 | |
a666e5c0 MP |
1890 | md->swap_bios = get_swap_bios(); |
1891 | sema_init(&md->swap_bios_semaphore, md->swap_bios); | |
1892 | mutex_init(&md->swap_bios_lock); | |
1893 | ||
1da177e4 LT |
1894 | md->disk->major = _major; |
1895 | md->disk->first_minor = minor; | |
1896 | md->disk->fops = &dm_blk_dops; | |
1897 | md->disk->queue = md->queue; | |
1898 | md->disk->private_data = md; | |
1899 | sprintf(md->disk->disk_name, "dm-%d", minor); | |
f26c5719 | 1900 | |
976431b0 | 1901 | if (IS_ENABLED(CONFIG_DAX_DRIVER)) { |
fefc1d97 PG |
1902 | md->dax_dev = alloc_dax(md, md->disk->disk_name, |
1903 | &dm_dax_ops, 0); | |
4e4ced93 | 1904 | if (IS_ERR(md->dax_dev)) |
976431b0 DW |
1905 | goto bad; |
1906 | } | |
f26c5719 | 1907 | |
c100ec49 | 1908 | add_disk_no_queue_reg(md->disk); |
7e51f257 | 1909 | format_dev_t(md->name, MKDEV(_major, minor)); |
1da177e4 | 1910 | |
670368a8 | 1911 | md->wq = alloc_workqueue("kdmflush", WQ_MEM_RECLAIM, 0); |
304f3f6a | 1912 | if (!md->wq) |
0f20972f | 1913 | goto bad; |
304f3f6a | 1914 | |
fd2ed4d2 MP |
1915 | dm_stats_init(&md->stats); |
1916 | ||
ba61fdd1 | 1917 | /* Populate the mapping, nobody knows we exist yet */ |
f32c10b0 | 1918 | spin_lock(&_minor_lock); |
ba61fdd1 | 1919 | old_md = idr_replace(&_minor_idr, md, minor); |
f32c10b0 | 1920 | spin_unlock(&_minor_lock); |
ba61fdd1 JM |
1921 | |
1922 | BUG_ON(old_md != MINOR_ALLOCED); | |
1923 | ||
1da177e4 LT |
1924 | return md; |
1925 | ||
0f20972f MS |
1926 | bad: |
1927 | cleanup_mapped_device(md); | |
83d5e5b0 | 1928 | bad_io_barrier: |
1da177e4 | 1929 | free_minor(minor); |
6ed7ade8 | 1930 | bad_minor: |
10da4f79 | 1931 | module_put(THIS_MODULE); |
6ed7ade8 | 1932 | bad_module_get: |
856eb091 | 1933 | kvfree(md); |
1da177e4 LT |
1934 | return NULL; |
1935 | } | |
1936 | ||
ae9da83f JN |
1937 | static void unlock_fs(struct mapped_device *md); |
1938 | ||
1da177e4 LT |
1939 | static void free_dev(struct mapped_device *md) |
1940 | { | |
f331c029 | 1941 | int minor = MINOR(disk_devt(md->disk)); |
63d94e48 | 1942 | |
32a926da | 1943 | unlock_fs(md); |
2eb6e1e3 | 1944 | |
0f20972f | 1945 | cleanup_mapped_device(md); |
63a4f065 | 1946 | |
86f1152b | 1947 | free_table_devices(&md->table_devices); |
63a4f065 | 1948 | dm_stats_cleanup(&md->stats); |
63a4f065 MS |
1949 | free_minor(minor); |
1950 | ||
10da4f79 | 1951 | module_put(THIS_MODULE); |
856eb091 | 1952 | kvfree(md); |
1da177e4 LT |
1953 | } |
1954 | ||
2a2a4c51 | 1955 | static int __bind_mempools(struct mapped_device *md, struct dm_table *t) |
e6ee8c0b | 1956 | { |
c0820cf5 | 1957 | struct dm_md_mempools *p = dm_table_get_md_mempools(t); |
2a2a4c51 | 1958 | int ret = 0; |
e6ee8c0b | 1959 | |
0776aa0e | 1960 | if (dm_table_bio_based(t)) { |
64f52b0e MS |
1961 | /* |
1962 | * The md may already have mempools that need changing. | |
1963 | * If so, reload bioset because front_pad may have changed | |
1964 | * because a different table was loaded. | |
1965 | */ | |
6f1c819c KO |
1966 | bioset_exit(&md->bs); |
1967 | bioset_exit(&md->io_bs); | |
0776aa0e | 1968 | |
6f1c819c | 1969 | } else if (bioset_initialized(&md->bs)) { |
4e6e36c3 MS |
1970 | /* |
1971 | * There's no need to reload with request-based dm | |
1972 | * because the size of front_pad doesn't change. | |
1973 | * Note for future: If you are to reload bioset, | |
1974 | * prep-ed requests in the queue may refer | |
1975 | * to bio from the old bioset, so you must walk | |
1976 | * through the queue to unprep. | |
1977 | */ | |
1978 | goto out; | |
c0820cf5 | 1979 | } |
e6ee8c0b | 1980 | |
6f1c819c KO |
1981 | BUG_ON(!p || |
1982 | bioset_initialized(&md->bs) || | |
1983 | bioset_initialized(&md->io_bs)); | |
cbc4e3c1 | 1984 | |
2a2a4c51 JA |
1985 | ret = bioset_init_from_src(&md->bs, &p->bs); |
1986 | if (ret) | |
1987 | goto out; | |
1988 | ret = bioset_init_from_src(&md->io_bs, &p->io_bs); | |
1989 | if (ret) | |
1990 | bioset_exit(&md->bs); | |
e6ee8c0b | 1991 | out: |
02233342 | 1992 | /* mempool bind completed, no longer need any mempools in the table */ |
e6ee8c0b | 1993 | dm_table_free_md_mempools(t); |
2a2a4c51 | 1994 | return ret; |
e6ee8c0b KU |
1995 | } |
1996 | ||
1da177e4 LT |
1997 | /* |
1998 | * Bind a table to the device. | |
1999 | */ | |
2000 | static void event_callback(void *context) | |
2001 | { | |
7a8c3d3b MA |
2002 | unsigned long flags; |
2003 | LIST_HEAD(uevents); | |
1da177e4 LT |
2004 | struct mapped_device *md = (struct mapped_device *) context; |
2005 | ||
7a8c3d3b MA |
2006 | spin_lock_irqsave(&md->uevent_lock, flags); |
2007 | list_splice_init(&md->uevent_list, &uevents); | |
2008 | spin_unlock_irqrestore(&md->uevent_lock, flags); | |
2009 | ||
ed9e1982 | 2010 | dm_send_uevents(&uevents, &disk_to_dev(md->disk)->kobj); |
7a8c3d3b | 2011 | |
1da177e4 LT |
2012 | atomic_inc(&md->event_nr); |
2013 | wake_up(&md->eventq); | |
62e08243 | 2014 | dm_issue_global_event(); |
1da177e4 LT |
2015 | } |
2016 | ||
042d2a9b AK |
2017 | /* |
2018 | * Returns old map, which caller must destroy. | |
2019 | */ | |
2020 | static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, | |
2021 | struct queue_limits *limits) | |
1da177e4 | 2022 | { |
042d2a9b | 2023 | struct dm_table *old_map; |
165125e1 | 2024 | struct request_queue *q = md->queue; |
978e51ba | 2025 | bool request_based = dm_table_request_based(t); |
1da177e4 | 2026 | sector_t size; |
2a2a4c51 | 2027 | int ret; |
1da177e4 | 2028 | |
5a8f1f80 BVA |
2029 | lockdep_assert_held(&md->suspend_lock); |
2030 | ||
1da177e4 | 2031 | size = dm_table_get_size(t); |
3ac51e74 DW |
2032 | |
2033 | /* | |
2034 | * Wipe any geometry if the size of the table changed. | |
2035 | */ | |
fd2ed4d2 | 2036 | if (size != dm_get_size(md)) |
3ac51e74 DW |
2037 | memset(&md->geometry, 0, sizeof(md->geometry)); |
2038 | ||
5424a0b8 MP |
2039 | if (!get_capacity(md->disk)) |
2040 | set_capacity(md->disk, size); | |
2041 | else | |
2042 | set_capacity_and_notify(md->disk, size); | |
d5816876 | 2043 | |
2ca3310e AK |
2044 | dm_table_event_callback(t, event_callback, md); |
2045 | ||
e6ee8c0b KU |
2046 | /* |
2047 | * The queue hasn't been stopped yet, if the old table type wasn't | |
2048 | * for request-based during suspension. So stop it to prevent | |
2049 | * I/O mapping before resume. | |
2050 | * This must be done before setting the queue restrictions, | |
2051 | * because request-based dm may be run just after the setting. | |
2052 | */ | |
978e51ba | 2053 | if (request_based) |
eca7ee6d | 2054 | dm_stop_queue(q); |
978e51ba | 2055 | |
9c37de29 | 2056 | if (request_based) { |
16f12266 | 2057 | /* |
9c37de29 MS |
2058 | * Leverage the fact that request-based DM targets are |
2059 | * immutable singletons - used to optimize dm_mq_queue_rq. | |
16f12266 MS |
2060 | */ |
2061 | md->immutable_target = dm_table_get_immutable_target(t); | |
2062 | } | |
e6ee8c0b | 2063 | |
2a2a4c51 JA |
2064 | ret = __bind_mempools(md, t); |
2065 | if (ret) { | |
2066 | old_map = ERR_PTR(ret); | |
2067 | goto out; | |
2068 | } | |
e6ee8c0b | 2069 | |
a12f5d48 | 2070 | old_map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
1d3aa6f6 | 2071 | rcu_assign_pointer(md->map, (void *)t); |
36a0456f AK |
2072 | md->immutable_target_type = dm_table_get_immutable_target_type(t); |
2073 | ||
754c5fc7 | 2074 | dm_table_set_restrictions(t, q, limits); |
41abc4e1 HR |
2075 | if (old_map) |
2076 | dm_sync_table(md); | |
1da177e4 | 2077 | |
2a2a4c51 | 2078 | out: |
042d2a9b | 2079 | return old_map; |
1da177e4 LT |
2080 | } |
2081 | ||
a7940155 AK |
2082 | /* |
2083 | * Returns unbound table for the caller to free. | |
2084 | */ | |
2085 | static struct dm_table *__unbind(struct mapped_device *md) | |
1da177e4 | 2086 | { |
a12f5d48 | 2087 | struct dm_table *map = rcu_dereference_protected(md->map, 1); |
1da177e4 LT |
2088 | |
2089 | if (!map) | |
a7940155 | 2090 | return NULL; |
1da177e4 LT |
2091 | |
2092 | dm_table_event_callback(map, NULL, NULL); | |
9cdb8520 | 2093 | RCU_INIT_POINTER(md->map, NULL); |
83d5e5b0 | 2094 | dm_sync_table(md); |
a7940155 AK |
2095 | |
2096 | return map; | |
1da177e4 LT |
2097 | } |
2098 | ||
2099 | /* | |
2100 | * Constructor for a new device. | |
2101 | */ | |
2b06cfff | 2102 | int dm_create(int minor, struct mapped_device **result) |
1da177e4 | 2103 | { |
c12c9a3c | 2104 | int r; |
1da177e4 LT |
2105 | struct mapped_device *md; |
2106 | ||
2b06cfff | 2107 | md = alloc_dev(minor); |
1da177e4 LT |
2108 | if (!md) |
2109 | return -ENXIO; | |
2110 | ||
c12c9a3c MS |
2111 | r = dm_sysfs_init(md); |
2112 | if (r) { | |
2113 | free_dev(md); | |
2114 | return r; | |
2115 | } | |
784aae73 | 2116 | |
1da177e4 LT |
2117 | *result = md; |
2118 | return 0; | |
2119 | } | |
2120 | ||
a5664dad MS |
2121 | /* |
2122 | * Functions to manage md->type. | |
2123 | * All are required to hold md->type_lock. | |
2124 | */ | |
2125 | void dm_lock_md_type(struct mapped_device *md) | |
2126 | { | |
2127 | mutex_lock(&md->type_lock); | |
2128 | } | |
2129 | ||
2130 | void dm_unlock_md_type(struct mapped_device *md) | |
2131 | { | |
2132 | mutex_unlock(&md->type_lock); | |
2133 | } | |
2134 | ||
7e0d574f | 2135 | void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type) |
a5664dad | 2136 | { |
00c4fc3b | 2137 | BUG_ON(!mutex_is_locked(&md->type_lock)); |
a5664dad MS |
2138 | md->type = type; |
2139 | } | |
2140 | ||
7e0d574f | 2141 | enum dm_queue_mode dm_get_md_type(struct mapped_device *md) |
a5664dad MS |
2142 | { |
2143 | return md->type; | |
2144 | } | |
2145 | ||
36a0456f AK |
2146 | struct target_type *dm_get_immutable_target_type(struct mapped_device *md) |
2147 | { | |
2148 | return md->immutable_target_type; | |
2149 | } | |
2150 | ||
f84cb8a4 MS |
2151 | /* |
2152 | * The queue_limits are only valid as long as you have a reference | |
2153 | * count on 'md'. | |
2154 | */ | |
2155 | struct queue_limits *dm_get_queue_limits(struct mapped_device *md) | |
2156 | { | |
2157 | BUG_ON(!atomic_read(&md->holders)); | |
2158 | return &md->queue->limits; | |
2159 | } | |
2160 | EXPORT_SYMBOL_GPL(dm_get_queue_limits); | |
2161 | ||
4a0b4ddf MS |
2162 | /* |
2163 | * Setup the DM device's queue based on md's type | |
2164 | */ | |
591ddcfc | 2165 | int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t) |
4a0b4ddf | 2166 | { |
bfebd1cd | 2167 | int r; |
c100ec49 | 2168 | struct queue_limits limits; |
7e0d574f | 2169 | enum dm_queue_mode type = dm_get_md_type(md); |
bfebd1cd | 2170 | |
545ed20e | 2171 | switch (type) { |
bfebd1cd | 2172 | case DM_TYPE_REQUEST_BASED: |
681cc5e8 | 2173 | md->disk->fops = &dm_rq_blk_dops; |
e83068a5 | 2174 | r = dm_mq_init_request_queue(md, t); |
bfebd1cd | 2175 | if (r) { |
681cc5e8 | 2176 | DMERR("Cannot initialize queue for request-based dm mapped device"); |
bfebd1cd MS |
2177 | return r; |
2178 | } | |
2179 | break; | |
2180 | case DM_TYPE_BIO_BASED: | |
545ed20e | 2181 | case DM_TYPE_DAX_BIO_BASED: |
bfebd1cd | 2182 | break; |
7e0d574f BVA |
2183 | case DM_TYPE_NONE: |
2184 | WARN_ON_ONCE(true); | |
2185 | break; | |
4a0b4ddf MS |
2186 | } |
2187 | ||
c100ec49 MS |
2188 | r = dm_calculate_queue_limits(t, &limits); |
2189 | if (r) { | |
2190 | DMERR("Cannot calculate initial queue limits"); | |
2191 | return r; | |
2192 | } | |
2193 | dm_table_set_restrictions(t, md->queue, &limits); | |
2194 | blk_register_queue(md->disk); | |
2195 | ||
4a0b4ddf MS |
2196 | return 0; |
2197 | } | |
2198 | ||
2bec1f4a | 2199 | struct mapped_device *dm_get_md(dev_t dev) |
1da177e4 LT |
2200 | { |
2201 | struct mapped_device *md; | |
1da177e4 LT |
2202 | unsigned minor = MINOR(dev); |
2203 | ||
2204 | if (MAJOR(dev) != _major || minor >= (1 << MINORBITS)) | |
2205 | return NULL; | |
2206 | ||
f32c10b0 | 2207 | spin_lock(&_minor_lock); |
1da177e4 LT |
2208 | |
2209 | md = idr_find(&_minor_idr, minor); | |
49de5769 MS |
2210 | if (!md || md == MINOR_ALLOCED || (MINOR(disk_devt(dm_disk(md))) != minor) || |
2211 | test_bit(DMF_FREEING, &md->flags) || dm_deleting_md(md)) { | |
2212 | md = NULL; | |
2213 | goto out; | |
fba9f90e | 2214 | } |
49de5769 | 2215 | dm_get(md); |
fba9f90e | 2216 | out: |
f32c10b0 | 2217 | spin_unlock(&_minor_lock); |
1da177e4 | 2218 | |
637842cf DT |
2219 | return md; |
2220 | } | |
3cf2e4ba | 2221 | EXPORT_SYMBOL_GPL(dm_get_md); |
d229a958 | 2222 | |
9ade92a9 | 2223 | void *dm_get_mdptr(struct mapped_device *md) |
637842cf | 2224 | { |
9ade92a9 | 2225 | return md->interface_ptr; |
1da177e4 LT |
2226 | } |
2227 | ||
2228 | void dm_set_mdptr(struct mapped_device *md, void *ptr) | |
2229 | { | |
2230 | md->interface_ptr = ptr; | |
2231 | } | |
2232 | ||
2233 | void dm_get(struct mapped_device *md) | |
2234 | { | |
2235 | atomic_inc(&md->holders); | |
3f77316d | 2236 | BUG_ON(test_bit(DMF_FREEING, &md->flags)); |
1da177e4 LT |
2237 | } |
2238 | ||
09ee96b2 MP |
2239 | int dm_hold(struct mapped_device *md) |
2240 | { | |
2241 | spin_lock(&_minor_lock); | |
2242 | if (test_bit(DMF_FREEING, &md->flags)) { | |
2243 | spin_unlock(&_minor_lock); | |
2244 | return -EBUSY; | |
2245 | } | |
2246 | dm_get(md); | |
2247 | spin_unlock(&_minor_lock); | |
2248 | return 0; | |
2249 | } | |
2250 | EXPORT_SYMBOL_GPL(dm_hold); | |
2251 | ||
72d94861 AK |
2252 | const char *dm_device_name(struct mapped_device *md) |
2253 | { | |
2254 | return md->name; | |
2255 | } | |
2256 | EXPORT_SYMBOL_GPL(dm_device_name); | |
2257 | ||
3f77316d | 2258 | static void __dm_destroy(struct mapped_device *md, bool wait) |
1da177e4 | 2259 | { |
1134e5ae | 2260 | struct dm_table *map; |
83d5e5b0 | 2261 | int srcu_idx; |
1da177e4 | 2262 | |
3f77316d | 2263 | might_sleep(); |
fba9f90e | 2264 | |
63a4f065 | 2265 | spin_lock(&_minor_lock); |
3f77316d KU |
2266 | idr_replace(&_minor_idr, MINOR_ALLOCED, MINOR(disk_devt(dm_disk(md)))); |
2267 | set_bit(DMF_FREEING, &md->flags); | |
2268 | spin_unlock(&_minor_lock); | |
3b785fbc | 2269 | |
c12c9a3c | 2270 | blk_set_queue_dying(md->queue); |
3f77316d | 2271 | |
ab7c7bb6 MP |
2272 | /* |
2273 | * Take suspend_lock so that presuspend and postsuspend methods | |
2274 | * do not race with internal suspend. | |
2275 | */ | |
2276 | mutex_lock(&md->suspend_lock); | |
2a708cff | 2277 | map = dm_get_live_table(md, &srcu_idx); |
3f77316d KU |
2278 | if (!dm_suspended_md(md)) { |
2279 | dm_table_presuspend_targets(map); | |
adc0daad | 2280 | set_bit(DMF_SUSPENDED, &md->flags); |
5df96f2b | 2281 | set_bit(DMF_POST_SUSPENDING, &md->flags); |
3f77316d | 2282 | dm_table_postsuspend_targets(map); |
1da177e4 | 2283 | } |
83d5e5b0 MP |
2284 | /* dm_put_live_table must be before msleep, otherwise deadlock is possible */ |
2285 | dm_put_live_table(md, srcu_idx); | |
2a708cff | 2286 | mutex_unlock(&md->suspend_lock); |
83d5e5b0 | 2287 | |
3f77316d KU |
2288 | /* |
2289 | * Rare, but there may be I/O requests still going to complete, | |
2290 | * for example. Wait for all references to disappear. | |
2291 | * No one should increment the reference count of the mapped_device, | |
2292 | * after the mapped_device state becomes DMF_FREEING. | |
2293 | */ | |
2294 | if (wait) | |
2295 | while (atomic_read(&md->holders)) | |
2296 | msleep(1); | |
2297 | else if (atomic_read(&md->holders)) | |
2298 | DMWARN("%s: Forcibly removing mapped_device still in use! (%d users)", | |
2299 | dm_device_name(md), atomic_read(&md->holders)); | |
2300 | ||
2301 | dm_sysfs_exit(md); | |
3f77316d KU |
2302 | dm_table_destroy(__unbind(md)); |
2303 | free_dev(md); | |
2304 | } | |
2305 | ||
2306 | void dm_destroy(struct mapped_device *md) | |
2307 | { | |
2308 | __dm_destroy(md, true); | |
2309 | } | |
2310 | ||
2311 | void dm_destroy_immediate(struct mapped_device *md) | |
2312 | { | |
2313 | __dm_destroy(md, false); | |
2314 | } | |
2315 | ||
2316 | void dm_put(struct mapped_device *md) | |
2317 | { | |
2318 | atomic_dec(&md->holders); | |
1da177e4 | 2319 | } |
79eb885c | 2320 | EXPORT_SYMBOL_GPL(dm_put); |
1da177e4 | 2321 | |
85067747 ML |
2322 | static bool md_in_flight_bios(struct mapped_device *md) |
2323 | { | |
2324 | int cpu; | |
8446fe92 | 2325 | struct block_device *part = dm_disk(md)->part0; |
85067747 ML |
2326 | long sum = 0; |
2327 | ||
2328 | for_each_possible_cpu(cpu) { | |
2329 | sum += part_stat_local_read_cpu(part, in_flight[0], cpu); | |
2330 | sum += part_stat_local_read_cpu(part, in_flight[1], cpu); | |
2331 | } | |
2332 | ||
2333 | return sum != 0; | |
2334 | } | |
2335 | ||
2336 | static int dm_wait_for_bios_completion(struct mapped_device *md, long task_state) | |
46125c1c MB |
2337 | { |
2338 | int r = 0; | |
9f4c3f87 | 2339 | DEFINE_WAIT(wait); |
46125c1c | 2340 | |
85067747 | 2341 | while (true) { |
9f4c3f87 | 2342 | prepare_to_wait(&md->wait, &wait, task_state); |
46125c1c | 2343 | |
85067747 | 2344 | if (!md_in_flight_bios(md)) |
46125c1c MB |
2345 | break; |
2346 | ||
e3fabdfd | 2347 | if (signal_pending_state(task_state, current)) { |
46125c1c MB |
2348 | r = -EINTR; |
2349 | break; | |
2350 | } | |
2351 | ||
2352 | io_schedule(); | |
2353 | } | |
9f4c3f87 | 2354 | finish_wait(&md->wait, &wait); |
b44ebeb0 | 2355 | |
46125c1c MB |
2356 | return r; |
2357 | } | |
2358 | ||
85067747 ML |
2359 | static int dm_wait_for_completion(struct mapped_device *md, long task_state) |
2360 | { | |
2361 | int r = 0; | |
2362 | ||
2363 | if (!queue_is_mq(md->queue)) | |
2364 | return dm_wait_for_bios_completion(md, task_state); | |
2365 | ||
2366 | while (true) { | |
2367 | if (!blk_mq_queue_inflight(md->queue)) | |
2368 | break; | |
2369 | ||
2370 | if (signal_pending_state(task_state, current)) { | |
2371 | r = -EINTR; | |
2372 | break; | |
2373 | } | |
2374 | ||
2375 | msleep(5); | |
2376 | } | |
2377 | ||
2378 | return r; | |
2379 | } | |
2380 | ||
1da177e4 LT |
2381 | /* |
2382 | * Process the deferred bios | |
2383 | */ | |
ef208587 | 2384 | static void dm_wq_work(struct work_struct *work) |
1da177e4 | 2385 | { |
0c2915b8 MS |
2386 | struct mapped_device *md = container_of(work, struct mapped_device, work); |
2387 | struct bio *bio; | |
ef208587 | 2388 | |
3b00b203 | 2389 | while (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) { |
df12ee99 | 2390 | spin_lock_irq(&md->deferred_lock); |
0c2915b8 | 2391 | bio = bio_list_pop(&md->deferred); |
df12ee99 AK |
2392 | spin_unlock_irq(&md->deferred_lock); |
2393 | ||
0c2915b8 | 2394 | if (!bio) |
df12ee99 | 2395 | break; |
022c2611 | 2396 | |
0c2915b8 | 2397 | submit_bio_noacct(bio); |
022c2611 | 2398 | } |
1da177e4 LT |
2399 | } |
2400 | ||
9a1fb464 | 2401 | static void dm_queue_flush(struct mapped_device *md) |
304f3f6a | 2402 | { |
3b00b203 | 2403 | clear_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
4e857c58 | 2404 | smp_mb__after_atomic(); |
53d5914f | 2405 | queue_work(md->wq, &md->work); |
304f3f6a MB |
2406 | } |
2407 | ||
1da177e4 | 2408 | /* |
042d2a9b | 2409 | * Swap in a new table, returning the old one for the caller to destroy. |
1da177e4 | 2410 | */ |
042d2a9b | 2411 | struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table) |
1da177e4 | 2412 | { |
87eb5b21 | 2413 | struct dm_table *live_map = NULL, *map = ERR_PTR(-EINVAL); |
754c5fc7 | 2414 | struct queue_limits limits; |
042d2a9b | 2415 | int r; |
1da177e4 | 2416 | |
e61290a4 | 2417 | mutex_lock(&md->suspend_lock); |
1da177e4 LT |
2418 | |
2419 | /* device must be suspended */ | |
4f186f8b | 2420 | if (!dm_suspended_md(md)) |
93c534ae | 2421 | goto out; |
1da177e4 | 2422 | |
3ae70656 MS |
2423 | /* |
2424 | * If the new table has no data devices, retain the existing limits. | |
2425 | * This helps multipath with queue_if_no_path if all paths disappear, | |
2426 | * then new I/O is queued based on these limits, and then some paths | |
2427 | * reappear. | |
2428 | */ | |
2429 | if (dm_table_has_no_data_devices(table)) { | |
83d5e5b0 | 2430 | live_map = dm_get_live_table_fast(md); |
3ae70656 MS |
2431 | if (live_map) |
2432 | limits = md->queue->limits; | |
83d5e5b0 | 2433 | dm_put_live_table_fast(md); |
3ae70656 MS |
2434 | } |
2435 | ||
87eb5b21 MC |
2436 | if (!live_map) { |
2437 | r = dm_calculate_queue_limits(table, &limits); | |
2438 | if (r) { | |
2439 | map = ERR_PTR(r); | |
2440 | goto out; | |
2441 | } | |
042d2a9b | 2442 | } |
754c5fc7 | 2443 | |
042d2a9b | 2444 | map = __bind(md, table, &limits); |
62e08243 | 2445 | dm_issue_global_event(); |
1da177e4 | 2446 | |
93c534ae | 2447 | out: |
e61290a4 | 2448 | mutex_unlock(&md->suspend_lock); |
042d2a9b | 2449 | return map; |
1da177e4 LT |
2450 | } |
2451 | ||
2452 | /* | |
2453 | * Functions to lock and unlock any filesystem running on the | |
2454 | * device. | |
2455 | */ | |
2ca3310e | 2456 | static int lock_fs(struct mapped_device *md) |
1da177e4 | 2457 | { |
e39e2e95 | 2458 | int r; |
1da177e4 | 2459 | |
040f04bd | 2460 | WARN_ON(test_bit(DMF_FROZEN, &md->flags)); |
aa8d7c2f | 2461 | |
977115c0 | 2462 | r = freeze_bdev(md->disk->part0); |
040f04bd CH |
2463 | if (!r) |
2464 | set_bit(DMF_FROZEN, &md->flags); | |
2465 | return r; | |
1da177e4 LT |
2466 | } |
2467 | ||
2ca3310e | 2468 | static void unlock_fs(struct mapped_device *md) |
1da177e4 | 2469 | { |
aa8d7c2f AK |
2470 | if (!test_bit(DMF_FROZEN, &md->flags)) |
2471 | return; | |
977115c0 | 2472 | thaw_bdev(md->disk->part0); |
aa8d7c2f | 2473 | clear_bit(DMF_FROZEN, &md->flags); |
1da177e4 LT |
2474 | } |
2475 | ||
2476 | /* | |
b48633f8 BVA |
2477 | * @suspend_flags: DM_SUSPEND_LOCKFS_FLAG and/or DM_SUSPEND_NOFLUSH_FLAG |
2478 | * @task_state: e.g. TASK_INTERRUPTIBLE or TASK_UNINTERRUPTIBLE | |
2479 | * @dmf_suspended_flag: DMF_SUSPENDED or DMF_SUSPENDED_INTERNALLY | |
2480 | * | |
ffcc3936 MS |
2481 | * If __dm_suspend returns 0, the device is completely quiescent |
2482 | * now. There is no request-processing activity. All new requests | |
2483 | * are being added to md->deferred list. | |
cec47e3d | 2484 | */ |
ffcc3936 | 2485 | static int __dm_suspend(struct mapped_device *md, struct dm_table *map, |
b48633f8 | 2486 | unsigned suspend_flags, long task_state, |
eaf9a736 | 2487 | int dmf_suspended_flag) |
1da177e4 | 2488 | { |
ffcc3936 MS |
2489 | bool do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG; |
2490 | bool noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG; | |
2491 | int r; | |
1da177e4 | 2492 | |
5a8f1f80 BVA |
2493 | lockdep_assert_held(&md->suspend_lock); |
2494 | ||
2e93ccc1 KU |
2495 | /* |
2496 | * DMF_NOFLUSH_SUSPENDING must be set before presuspend. | |
2497 | * This flag is cleared before dm_suspend returns. | |
2498 | */ | |
2499 | if (noflush) | |
2500 | set_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); | |
86331f39 | 2501 | else |
ac75b09f | 2502 | DMDEBUG("%s: suspending with flush", dm_device_name(md)); |
2e93ccc1 | 2503 | |
d67ee213 MS |
2504 | /* |
2505 | * This gets reverted if there's an error later and the targets | |
2506 | * provide the .presuspend_undo hook. | |
2507 | */ | |
cf222b37 AK |
2508 | dm_table_presuspend_targets(map); |
2509 | ||
32a926da | 2510 | /* |
9f518b27 KU |
2511 | * Flush I/O to the device. |
2512 | * Any I/O submitted after lock_fs() may not be flushed. | |
2513 | * noflush takes precedence over do_lockfs. | |
2514 | * (lock_fs() flushes I/Os and waits for them to complete.) | |
32a926da MP |
2515 | */ |
2516 | if (!noflush && do_lockfs) { | |
2517 | r = lock_fs(md); | |
d67ee213 MS |
2518 | if (r) { |
2519 | dm_table_presuspend_undo_targets(map); | |
ffcc3936 | 2520 | return r; |
d67ee213 | 2521 | } |
aa8d7c2f | 2522 | } |
1da177e4 LT |
2523 | |
2524 | /* | |
3b00b203 MP |
2525 | * Here we must make sure that no processes are submitting requests |
2526 | * to target drivers i.e. no one may be executing | |
0cede372 | 2527 | * __split_and_process_bio from dm_submit_bio. |
3b00b203 | 2528 | * |
0cede372 | 2529 | * To get all processes out of __split_and_process_bio in dm_submit_bio, |
3b00b203 | 2530 | * we take the write lock. To prevent any process from reentering |
0cede372 MS |
2531 | * __split_and_process_bio from dm_submit_bio and quiesce the thread |
2532 | * (dm_wq_work), we set DMF_BLOCK_IO_FOR_SUSPEND and call | |
6a8736d1 | 2533 | * flush_workqueue(md->wq). |
1da177e4 | 2534 | */ |
1eb787ec | 2535 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
41abc4e1 HR |
2536 | if (map) |
2537 | synchronize_srcu(&md->io_barrier); | |
1da177e4 | 2538 | |
d0bcb878 | 2539 | /* |
29e4013d TH |
2540 | * Stop md->queue before flushing md->wq in case request-based |
2541 | * dm defers requests to md->wq from md->queue. | |
d0bcb878 | 2542 | */ |
6a23e05c | 2543 | if (dm_request_based(md)) |
eca7ee6d | 2544 | dm_stop_queue(md->queue); |
cec47e3d | 2545 | |
d0bcb878 KU |
2546 | flush_workqueue(md->wq); |
2547 | ||
1da177e4 | 2548 | /* |
3b00b203 MP |
2549 | * At this point no more requests are entering target request routines. |
2550 | * We call dm_wait_for_completion to wait for all existing requests | |
2551 | * to finish. | |
1da177e4 | 2552 | */ |
b48633f8 | 2553 | r = dm_wait_for_completion(md, task_state); |
eaf9a736 MS |
2554 | if (!r) |
2555 | set_bit(dmf_suspended_flag, &md->flags); | |
1da177e4 | 2556 | |
6d6f10df | 2557 | if (noflush) |
022c2611 | 2558 | clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); |
41abc4e1 HR |
2559 | if (map) |
2560 | synchronize_srcu(&md->io_barrier); | |
2e93ccc1 | 2561 | |
1da177e4 | 2562 | /* were we interrupted ? */ |
46125c1c | 2563 | if (r < 0) { |
9a1fb464 | 2564 | dm_queue_flush(md); |
73d410c0 | 2565 | |
cec47e3d | 2566 | if (dm_request_based(md)) |
eca7ee6d | 2567 | dm_start_queue(md->queue); |
cec47e3d | 2568 | |
2ca3310e | 2569 | unlock_fs(md); |
d67ee213 | 2570 | dm_table_presuspend_undo_targets(map); |
ffcc3936 | 2571 | /* pushback list is already flushed, so skip flush */ |
2ca3310e | 2572 | } |
1da177e4 | 2573 | |
ffcc3936 MS |
2574 | return r; |
2575 | } | |
2576 | ||
2577 | /* | |
2578 | * We need to be able to change a mapping table under a mounted | |
2579 | * filesystem. For example we might want to move some data in | |
2580 | * the background. Before the table can be swapped with | |
2581 | * dm_bind_table, dm_suspend must be called to flush any in | |
2582 | * flight bios and ensure that any further io gets deferred. | |
2583 | */ | |
2584 | /* | |
2585 | * Suspend mechanism in request-based dm. | |
2586 | * | |
2587 | * 1. Flush all I/Os by lock_fs() if needed. | |
2588 | * 2. Stop dispatching any I/O by stopping the request_queue. | |
2589 | * 3. Wait for all in-flight I/Os to be completed or requeued. | |
2590 | * | |
2591 | * To abort suspend, start the request_queue. | |
2592 | */ | |
2593 | int dm_suspend(struct mapped_device *md, unsigned suspend_flags) | |
2594 | { | |
2595 | struct dm_table *map = NULL; | |
2596 | int r = 0; | |
2597 | ||
2598 | retry: | |
2599 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); | |
2600 | ||
2601 | if (dm_suspended_md(md)) { | |
2602 | r = -EINVAL; | |
2603 | goto out_unlock; | |
2604 | } | |
2605 | ||
2606 | if (dm_suspended_internally_md(md)) { | |
2607 | /* already internally suspended, wait for internal resume */ | |
2608 | mutex_unlock(&md->suspend_lock); | |
2609 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); | |
2610 | if (r) | |
2611 | return r; | |
2612 | goto retry; | |
2613 | } | |
2614 | ||
a12f5d48 | 2615 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
ffcc3936 | 2616 | |
eaf9a736 | 2617 | r = __dm_suspend(md, map, suspend_flags, TASK_INTERRUPTIBLE, DMF_SUSPENDED); |
ffcc3936 MS |
2618 | if (r) |
2619 | goto out_unlock; | |
3b00b203 | 2620 | |
5df96f2b | 2621 | set_bit(DMF_POST_SUSPENDING, &md->flags); |
4d4471cb | 2622 | dm_table_postsuspend_targets(map); |
5df96f2b | 2623 | clear_bit(DMF_POST_SUSPENDING, &md->flags); |
4d4471cb | 2624 | |
d287483d | 2625 | out_unlock: |
e61290a4 | 2626 | mutex_unlock(&md->suspend_lock); |
cf222b37 | 2627 | return r; |
1da177e4 LT |
2628 | } |
2629 | ||
ffcc3936 MS |
2630 | static int __dm_resume(struct mapped_device *md, struct dm_table *map) |
2631 | { | |
2632 | if (map) { | |
2633 | int r = dm_table_resume_targets(map); | |
2634 | if (r) | |
2635 | return r; | |
2636 | } | |
2637 | ||
2638 | dm_queue_flush(md); | |
2639 | ||
2640 | /* | |
2641 | * Flushing deferred I/Os must be done after targets are resumed | |
2642 | * so that mapping of targets can work correctly. | |
2643 | * Request-based dm is queueing the deferred I/Os in its request_queue. | |
2644 | */ | |
2645 | if (dm_request_based(md)) | |
eca7ee6d | 2646 | dm_start_queue(md->queue); |
ffcc3936 MS |
2647 | |
2648 | unlock_fs(md); | |
2649 | ||
2650 | return 0; | |
2651 | } | |
2652 | ||
1da177e4 LT |
2653 | int dm_resume(struct mapped_device *md) |
2654 | { | |
8dc23658 | 2655 | int r; |
cf222b37 | 2656 | struct dm_table *map = NULL; |
1da177e4 | 2657 | |
ffcc3936 | 2658 | retry: |
8dc23658 | 2659 | r = -EINVAL; |
ffcc3936 MS |
2660 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); |
2661 | ||
4f186f8b | 2662 | if (!dm_suspended_md(md)) |
cf222b37 | 2663 | goto out; |
cf222b37 | 2664 | |
ffcc3936 MS |
2665 | if (dm_suspended_internally_md(md)) { |
2666 | /* already internally suspended, wait for internal resume */ | |
2667 | mutex_unlock(&md->suspend_lock); | |
2668 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); | |
2669 | if (r) | |
2670 | return r; | |
2671 | goto retry; | |
2672 | } | |
2673 | ||
a12f5d48 | 2674 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
2ca3310e | 2675 | if (!map || !dm_table_get_size(map)) |
cf222b37 | 2676 | goto out; |
1da177e4 | 2677 | |
ffcc3936 | 2678 | r = __dm_resume(md, map); |
8757b776 MB |
2679 | if (r) |
2680 | goto out; | |
2ca3310e | 2681 | |
2ca3310e | 2682 | clear_bit(DMF_SUSPENDED, &md->flags); |
cf222b37 | 2683 | out: |
e61290a4 | 2684 | mutex_unlock(&md->suspend_lock); |
2ca3310e | 2685 | |
cf222b37 | 2686 | return r; |
1da177e4 LT |
2687 | } |
2688 | ||
fd2ed4d2 MP |
2689 | /* |
2690 | * Internal suspend/resume works like userspace-driven suspend. It waits | |
2691 | * until all bios finish and prevents issuing new bios to the target drivers. | |
2692 | * It may be used only from the kernel. | |
fd2ed4d2 MP |
2693 | */ |
2694 | ||
ffcc3936 | 2695 | static void __dm_internal_suspend(struct mapped_device *md, unsigned suspend_flags) |
fd2ed4d2 | 2696 | { |
ffcc3936 MS |
2697 | struct dm_table *map = NULL; |
2698 | ||
1ea0654e BVA |
2699 | lockdep_assert_held(&md->suspend_lock); |
2700 | ||
96b26c8c | 2701 | if (md->internal_suspend_count++) |
ffcc3936 MS |
2702 | return; /* nested internal suspend */ |
2703 | ||
2704 | if (dm_suspended_md(md)) { | |
2705 | set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2706 | return; /* nest suspend */ | |
2707 | } | |
2708 | ||
a12f5d48 | 2709 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
ffcc3936 MS |
2710 | |
2711 | /* | |
2712 | * Using TASK_UNINTERRUPTIBLE because only NOFLUSH internal suspend is | |
2713 | * supported. Properly supporting a TASK_INTERRUPTIBLE internal suspend | |
2714 | * would require changing .presuspend to return an error -- avoid this | |
2715 | * until there is a need for more elaborate variants of internal suspend. | |
2716 | */ | |
eaf9a736 MS |
2717 | (void) __dm_suspend(md, map, suspend_flags, TASK_UNINTERRUPTIBLE, |
2718 | DMF_SUSPENDED_INTERNALLY); | |
ffcc3936 | 2719 | |
5df96f2b | 2720 | set_bit(DMF_POST_SUSPENDING, &md->flags); |
ffcc3936 | 2721 | dm_table_postsuspend_targets(map); |
5df96f2b | 2722 | clear_bit(DMF_POST_SUSPENDING, &md->flags); |
ffcc3936 MS |
2723 | } |
2724 | ||
2725 | static void __dm_internal_resume(struct mapped_device *md) | |
2726 | { | |
96b26c8c MP |
2727 | BUG_ON(!md->internal_suspend_count); |
2728 | ||
2729 | if (--md->internal_suspend_count) | |
ffcc3936 MS |
2730 | return; /* resume from nested internal suspend */ |
2731 | ||
fd2ed4d2 | 2732 | if (dm_suspended_md(md)) |
ffcc3936 MS |
2733 | goto done; /* resume from nested suspend */ |
2734 | ||
2735 | /* | |
2736 | * NOTE: existing callers don't need to call dm_table_resume_targets | |
2737 | * (which may fail -- so best to avoid it for now by passing NULL map) | |
2738 | */ | |
2739 | (void) __dm_resume(md, NULL); | |
2740 | ||
2741 | done: | |
2742 | clear_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2743 | smp_mb__after_atomic(); | |
2744 | wake_up_bit(&md->flags, DMF_SUSPENDED_INTERNALLY); | |
2745 | } | |
2746 | ||
2747 | void dm_internal_suspend_noflush(struct mapped_device *md) | |
2748 | { | |
2749 | mutex_lock(&md->suspend_lock); | |
2750 | __dm_internal_suspend(md, DM_SUSPEND_NOFLUSH_FLAG); | |
2751 | mutex_unlock(&md->suspend_lock); | |
2752 | } | |
2753 | EXPORT_SYMBOL_GPL(dm_internal_suspend_noflush); | |
2754 | ||
2755 | void dm_internal_resume(struct mapped_device *md) | |
2756 | { | |
2757 | mutex_lock(&md->suspend_lock); | |
2758 | __dm_internal_resume(md); | |
2759 | mutex_unlock(&md->suspend_lock); | |
2760 | } | |
2761 | EXPORT_SYMBOL_GPL(dm_internal_resume); | |
2762 | ||
2763 | /* | |
2764 | * Fast variants of internal suspend/resume hold md->suspend_lock, | |
2765 | * which prevents interaction with userspace-driven suspend. | |
2766 | */ | |
2767 | ||
2768 | void dm_internal_suspend_fast(struct mapped_device *md) | |
2769 | { | |
2770 | mutex_lock(&md->suspend_lock); | |
2771 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) | |
fd2ed4d2 MP |
2772 | return; |
2773 | ||
2774 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); | |
2775 | synchronize_srcu(&md->io_barrier); | |
2776 | flush_workqueue(md->wq); | |
2777 | dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE); | |
2778 | } | |
b735fede | 2779 | EXPORT_SYMBOL_GPL(dm_internal_suspend_fast); |
fd2ed4d2 | 2780 | |
ffcc3936 | 2781 | void dm_internal_resume_fast(struct mapped_device *md) |
fd2ed4d2 | 2782 | { |
ffcc3936 | 2783 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) |
fd2ed4d2 MP |
2784 | goto done; |
2785 | ||
2786 | dm_queue_flush(md); | |
2787 | ||
2788 | done: | |
2789 | mutex_unlock(&md->suspend_lock); | |
2790 | } | |
b735fede | 2791 | EXPORT_SYMBOL_GPL(dm_internal_resume_fast); |
fd2ed4d2 | 2792 | |
1da177e4 LT |
2793 | /*----------------------------------------------------------------- |
2794 | * Event notification. | |
2795 | *---------------------------------------------------------------*/ | |
3abf85b5 | 2796 | int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, |
60935eb2 | 2797 | unsigned cookie) |
69267a30 | 2798 | { |
6958c1c6 MP |
2799 | int r; |
2800 | unsigned noio_flag; | |
60935eb2 MB |
2801 | char udev_cookie[DM_COOKIE_LENGTH]; |
2802 | char *envp[] = { udev_cookie, NULL }; | |
2803 | ||
6958c1c6 MP |
2804 | noio_flag = memalloc_noio_save(); |
2805 | ||
60935eb2 | 2806 | if (!cookie) |
6958c1c6 | 2807 | r = kobject_uevent(&disk_to_dev(md->disk)->kobj, action); |
60935eb2 MB |
2808 | else { |
2809 | snprintf(udev_cookie, DM_COOKIE_LENGTH, "%s=%u", | |
2810 | DM_COOKIE_ENV_VAR_NAME, cookie); | |
6958c1c6 MP |
2811 | r = kobject_uevent_env(&disk_to_dev(md->disk)->kobj, |
2812 | action, envp); | |
60935eb2 | 2813 | } |
6958c1c6 MP |
2814 | |
2815 | memalloc_noio_restore(noio_flag); | |
2816 | ||
2817 | return r; | |
69267a30 AK |
2818 | } |
2819 | ||
7a8c3d3b MA |
2820 | uint32_t dm_next_uevent_seq(struct mapped_device *md) |
2821 | { | |
2822 | return atomic_add_return(1, &md->uevent_seq); | |
2823 | } | |
2824 | ||
1da177e4 LT |
2825 | uint32_t dm_get_event_nr(struct mapped_device *md) |
2826 | { | |
2827 | return atomic_read(&md->event_nr); | |
2828 | } | |
2829 | ||
2830 | int dm_wait_event(struct mapped_device *md, int event_nr) | |
2831 | { | |
2832 | return wait_event_interruptible(md->eventq, | |
2833 | (event_nr != atomic_read(&md->event_nr))); | |
2834 | } | |
2835 | ||
7a8c3d3b MA |
2836 | void dm_uevent_add(struct mapped_device *md, struct list_head *elist) |
2837 | { | |
2838 | unsigned long flags; | |
2839 | ||
2840 | spin_lock_irqsave(&md->uevent_lock, flags); | |
2841 | list_add(elist, &md->uevent_list); | |
2842 | spin_unlock_irqrestore(&md->uevent_lock, flags); | |
2843 | } | |
2844 | ||
1da177e4 LT |
2845 | /* |
2846 | * The gendisk is only valid as long as you have a reference | |
2847 | * count on 'md'. | |
2848 | */ | |
2849 | struct gendisk *dm_disk(struct mapped_device *md) | |
2850 | { | |
2851 | return md->disk; | |
2852 | } | |
65ff5b7d | 2853 | EXPORT_SYMBOL_GPL(dm_disk); |
1da177e4 | 2854 | |
784aae73 MB |
2855 | struct kobject *dm_kobject(struct mapped_device *md) |
2856 | { | |
2995fa78 | 2857 | return &md->kobj_holder.kobj; |
784aae73 MB |
2858 | } |
2859 | ||
784aae73 MB |
2860 | struct mapped_device *dm_get_from_kobject(struct kobject *kobj) |
2861 | { | |
2862 | struct mapped_device *md; | |
2863 | ||
2995fa78 | 2864 | md = container_of(kobj, struct mapped_device, kobj_holder.kobj); |
784aae73 | 2865 | |
b9a41d21 HT |
2866 | spin_lock(&_minor_lock); |
2867 | if (test_bit(DMF_FREEING, &md->flags) || dm_deleting_md(md)) { | |
2868 | md = NULL; | |
2869 | goto out; | |
2870 | } | |
784aae73 | 2871 | dm_get(md); |
b9a41d21 HT |
2872 | out: |
2873 | spin_unlock(&_minor_lock); | |
2874 | ||
784aae73 MB |
2875 | return md; |
2876 | } | |
2877 | ||
4f186f8b | 2878 | int dm_suspended_md(struct mapped_device *md) |
1da177e4 LT |
2879 | { |
2880 | return test_bit(DMF_SUSPENDED, &md->flags); | |
2881 | } | |
2882 | ||
5df96f2b MP |
2883 | static int dm_post_suspending_md(struct mapped_device *md) |
2884 | { | |
2885 | return test_bit(DMF_POST_SUSPENDING, &md->flags); | |
2886 | } | |
2887 | ||
ffcc3936 MS |
2888 | int dm_suspended_internally_md(struct mapped_device *md) |
2889 | { | |
2890 | return test_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2891 | } | |
2892 | ||
2c140a24 MP |
2893 | int dm_test_deferred_remove_flag(struct mapped_device *md) |
2894 | { | |
2895 | return test_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
2896 | } | |
2897 | ||
64dbce58 KU |
2898 | int dm_suspended(struct dm_target *ti) |
2899 | { | |
33bd6f06 | 2900 | return dm_suspended_md(ti->table->md); |
64dbce58 KU |
2901 | } |
2902 | EXPORT_SYMBOL_GPL(dm_suspended); | |
2903 | ||
5df96f2b MP |
2904 | int dm_post_suspending(struct dm_target *ti) |
2905 | { | |
33bd6f06 | 2906 | return dm_post_suspending_md(ti->table->md); |
5df96f2b MP |
2907 | } |
2908 | EXPORT_SYMBOL_GPL(dm_post_suspending); | |
2909 | ||
2e93ccc1 KU |
2910 | int dm_noflush_suspending(struct dm_target *ti) |
2911 | { | |
33bd6f06 | 2912 | return __noflush_suspending(ti->table->md); |
2e93ccc1 KU |
2913 | } |
2914 | EXPORT_SYMBOL_GPL(dm_noflush_suspending); | |
2915 | ||
7e0d574f | 2916 | struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type, |
0776aa0e MS |
2917 | unsigned integrity, unsigned per_io_data_size, |
2918 | unsigned min_pool_size) | |
e6ee8c0b | 2919 | { |
115485e8 | 2920 | struct dm_md_mempools *pools = kzalloc_node(sizeof(*pools), GFP_KERNEL, md->numa_node_id); |
78d8e58a | 2921 | unsigned int pool_size = 0; |
64f52b0e | 2922 | unsigned int front_pad, io_front_pad; |
6f1c819c | 2923 | int ret; |
e6ee8c0b KU |
2924 | |
2925 | if (!pools) | |
4e6e36c3 | 2926 | return NULL; |
e6ee8c0b | 2927 | |
78d8e58a MS |
2928 | switch (type) { |
2929 | case DM_TYPE_BIO_BASED: | |
545ed20e | 2930 | case DM_TYPE_DAX_BIO_BASED: |
0776aa0e | 2931 | pool_size = max(dm_get_reserved_bio_based_ios(), min_pool_size); |
62f26317 JX |
2932 | front_pad = roundup(per_io_data_size, __alignof__(struct dm_target_io)) + DM_TARGET_IO_BIO_OFFSET; |
2933 | io_front_pad = roundup(per_io_data_size, __alignof__(struct dm_io)) + DM_IO_BIO_OFFSET; | |
6f1c819c KO |
2934 | ret = bioset_init(&pools->io_bs, pool_size, io_front_pad, 0); |
2935 | if (ret) | |
64f52b0e | 2936 | goto out; |
6f1c819c | 2937 | if (integrity && bioset_integrity_create(&pools->io_bs, pool_size)) |
eb8db831 | 2938 | goto out; |
78d8e58a MS |
2939 | break; |
2940 | case DM_TYPE_REQUEST_BASED: | |
0776aa0e | 2941 | pool_size = max(dm_get_reserved_rq_based_ios(), min_pool_size); |
78d8e58a | 2942 | front_pad = offsetof(struct dm_rq_clone_bio_info, clone); |
591ddcfc | 2943 | /* per_io_data_size is used for blk-mq pdu at queue allocation */ |
78d8e58a MS |
2944 | break; |
2945 | default: | |
2946 | BUG(); | |
2947 | } | |
2948 | ||
6f1c819c KO |
2949 | ret = bioset_init(&pools->bs, pool_size, front_pad, 0); |
2950 | if (ret) | |
5f015204 | 2951 | goto out; |
e6ee8c0b | 2952 | |
6f1c819c | 2953 | if (integrity && bioset_integrity_create(&pools->bs, pool_size)) |
5f015204 | 2954 | goto out; |
a91a2785 | 2955 | |
e6ee8c0b | 2956 | return pools; |
5f1b670d | 2957 | |
5f1b670d CH |
2958 | out: |
2959 | dm_free_md_mempools(pools); | |
78d8e58a | 2960 | |
4e6e36c3 | 2961 | return NULL; |
e6ee8c0b KU |
2962 | } |
2963 | ||
2964 | void dm_free_md_mempools(struct dm_md_mempools *pools) | |
2965 | { | |
2966 | if (!pools) | |
2967 | return; | |
2968 | ||
6f1c819c KO |
2969 | bioset_exit(&pools->bs); |
2970 | bioset_exit(&pools->io_bs); | |
e6ee8c0b KU |
2971 | |
2972 | kfree(pools); | |
2973 | } | |
2974 | ||
9c72bad1 CH |
2975 | struct dm_pr { |
2976 | u64 old_key; | |
2977 | u64 new_key; | |
2978 | u32 flags; | |
2979 | bool fail_early; | |
2980 | }; | |
2981 | ||
2982 | static int dm_call_pr(struct block_device *bdev, iterate_devices_callout_fn fn, | |
2983 | void *data) | |
71cdb697 CH |
2984 | { |
2985 | struct mapped_device *md = bdev->bd_disk->private_data; | |
9c72bad1 CH |
2986 | struct dm_table *table; |
2987 | struct dm_target *ti; | |
2988 | int ret = -ENOTTY, srcu_idx; | |
71cdb697 | 2989 | |
9c72bad1 CH |
2990 | table = dm_get_live_table(md, &srcu_idx); |
2991 | if (!table || !dm_table_get_size(table)) | |
2992 | goto out; | |
71cdb697 | 2993 | |
9c72bad1 CH |
2994 | /* We only support devices that have a single target */ |
2995 | if (dm_table_get_num_targets(table) != 1) | |
2996 | goto out; | |
2997 | ti = dm_table_get_target(table, 0); | |
71cdb697 | 2998 | |
9c72bad1 CH |
2999 | ret = -EINVAL; |
3000 | if (!ti->type->iterate_devices) | |
3001 | goto out; | |
3002 | ||
3003 | ret = ti->type->iterate_devices(ti, fn, data); | |
3004 | out: | |
3005 | dm_put_live_table(md, srcu_idx); | |
3006 | return ret; | |
3007 | } | |
3008 | ||
3009 | /* | |
3010 | * For register / unregister we need to manually call out to every path. | |
3011 | */ | |
3012 | static int __dm_pr_register(struct dm_target *ti, struct dm_dev *dev, | |
3013 | sector_t start, sector_t len, void *data) | |
3014 | { | |
3015 | struct dm_pr *pr = data; | |
3016 | const struct pr_ops *ops = dev->bdev->bd_disk->fops->pr_ops; | |
3017 | ||
3018 | if (!ops || !ops->pr_register) | |
3019 | return -EOPNOTSUPP; | |
3020 | return ops->pr_register(dev->bdev, pr->old_key, pr->new_key, pr->flags); | |
3021 | } | |
3022 | ||
3023 | static int dm_pr_register(struct block_device *bdev, u64 old_key, u64 new_key, | |
3024 | u32 flags) | |
3025 | { | |
3026 | struct dm_pr pr = { | |
3027 | .old_key = old_key, | |
3028 | .new_key = new_key, | |
3029 | .flags = flags, | |
3030 | .fail_early = true, | |
3031 | }; | |
3032 | int ret; | |
3033 | ||
3034 | ret = dm_call_pr(bdev, __dm_pr_register, &pr); | |
3035 | if (ret && new_key) { | |
3036 | /* unregister all paths if we failed to register any path */ | |
3037 | pr.old_key = new_key; | |
3038 | pr.new_key = 0; | |
3039 | pr.flags = 0; | |
3040 | pr.fail_early = false; | |
3041 | dm_call_pr(bdev, __dm_pr_register, &pr); | |
3042 | } | |
3043 | ||
3044 | return ret; | |
71cdb697 CH |
3045 | } |
3046 | ||
3047 | static int dm_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type, | |
956a4025 | 3048 | u32 flags) |
71cdb697 CH |
3049 | { |
3050 | struct mapped_device *md = bdev->bd_disk->private_data; | |
3051 | const struct pr_ops *ops; | |
971888c4 | 3052 | int r, srcu_idx; |
71cdb697 | 3053 | |
5bd5e8d8 | 3054 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
71cdb697 | 3055 | if (r < 0) |
971888c4 | 3056 | goto out; |
71cdb697 CH |
3057 | |
3058 | ops = bdev->bd_disk->fops->pr_ops; | |
3059 | if (ops && ops->pr_reserve) | |
3060 | r = ops->pr_reserve(bdev, key, type, flags); | |
3061 | else | |
3062 | r = -EOPNOTSUPP; | |
971888c4 MS |
3063 | out: |
3064 | dm_unprepare_ioctl(md, srcu_idx); | |
71cdb697 CH |
3065 | return r; |
3066 | } | |
3067 | ||
3068 | static int dm_pr_release(struct block_device *bdev, u64 key, enum pr_type type) | |
3069 | { | |
3070 | struct mapped_device *md = bdev->bd_disk->private_data; | |
3071 | const struct pr_ops *ops; | |
971888c4 | 3072 | int r, srcu_idx; |
71cdb697 | 3073 | |
5bd5e8d8 | 3074 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
71cdb697 | 3075 | if (r < 0) |
971888c4 | 3076 | goto out; |
71cdb697 CH |
3077 | |
3078 | ops = bdev->bd_disk->fops->pr_ops; | |
3079 | if (ops && ops->pr_release) | |
3080 | r = ops->pr_release(bdev, key, type); | |
3081 | else | |
3082 | r = -EOPNOTSUPP; | |
971888c4 MS |
3083 | out: |
3084 | dm_unprepare_ioctl(md, srcu_idx); | |
71cdb697 CH |
3085 | return r; |
3086 | } | |
3087 | ||
3088 | static int dm_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key, | |
956a4025 | 3089 | enum pr_type type, bool abort) |
71cdb697 CH |
3090 | { |
3091 | struct mapped_device *md = bdev->bd_disk->private_data; | |
3092 | const struct pr_ops *ops; | |
971888c4 | 3093 | int r, srcu_idx; |
71cdb697 | 3094 | |
5bd5e8d8 | 3095 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
71cdb697 | 3096 | if (r < 0) |
971888c4 | 3097 | goto out; |
71cdb697 CH |
3098 | |
3099 | ops = bdev->bd_disk->fops->pr_ops; | |
3100 | if (ops && ops->pr_preempt) | |
3101 | r = ops->pr_preempt(bdev, old_key, new_key, type, abort); | |
3102 | else | |
3103 | r = -EOPNOTSUPP; | |
971888c4 MS |
3104 | out: |
3105 | dm_unprepare_ioctl(md, srcu_idx); | |
71cdb697 CH |
3106 | return r; |
3107 | } | |
3108 | ||
3109 | static int dm_pr_clear(struct block_device *bdev, u64 key) | |
3110 | { | |
3111 | struct mapped_device *md = bdev->bd_disk->private_data; | |
3112 | const struct pr_ops *ops; | |
971888c4 | 3113 | int r, srcu_idx; |
71cdb697 | 3114 | |
5bd5e8d8 | 3115 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
71cdb697 | 3116 | if (r < 0) |
971888c4 | 3117 | goto out; |
71cdb697 CH |
3118 | |
3119 | ops = bdev->bd_disk->fops->pr_ops; | |
3120 | if (ops && ops->pr_clear) | |
3121 | r = ops->pr_clear(bdev, key); | |
3122 | else | |
3123 | r = -EOPNOTSUPP; | |
971888c4 MS |
3124 | out: |
3125 | dm_unprepare_ioctl(md, srcu_idx); | |
71cdb697 CH |
3126 | return r; |
3127 | } | |
3128 | ||
3129 | static const struct pr_ops dm_pr_ops = { | |
3130 | .pr_register = dm_pr_register, | |
3131 | .pr_reserve = dm_pr_reserve, | |
3132 | .pr_release = dm_pr_release, | |
3133 | .pr_preempt = dm_pr_preempt, | |
3134 | .pr_clear = dm_pr_clear, | |
3135 | }; | |
3136 | ||
83d5cde4 | 3137 | static const struct block_device_operations dm_blk_dops = { |
c62b37d9 | 3138 | .submit_bio = dm_submit_bio, |
1da177e4 LT |
3139 | .open = dm_blk_open, |
3140 | .release = dm_blk_close, | |
aa129a22 | 3141 | .ioctl = dm_blk_ioctl, |
3ac51e74 | 3142 | .getgeo = dm_blk_getgeo, |
e76239a3 | 3143 | .report_zones = dm_blk_report_zones, |
71cdb697 | 3144 | .pr_ops = &dm_pr_ops, |
1da177e4 LT |
3145 | .owner = THIS_MODULE |
3146 | }; | |
3147 | ||
681cc5e8 MS |
3148 | static const struct block_device_operations dm_rq_blk_dops = { |
3149 | .open = dm_blk_open, | |
3150 | .release = dm_blk_close, | |
3151 | .ioctl = dm_blk_ioctl, | |
3152 | .getgeo = dm_blk_getgeo, | |
3153 | .pr_ops = &dm_pr_ops, | |
3154 | .owner = THIS_MODULE | |
3155 | }; | |
3156 | ||
f26c5719 DW |
3157 | static const struct dax_operations dm_dax_ops = { |
3158 | .direct_access = dm_dax_direct_access, | |
7bf7eac8 | 3159 | .dax_supported = dm_dax_supported, |
7e026c8c | 3160 | .copy_from_iter = dm_dax_copy_from_iter, |
b3a9a0c3 | 3161 | .copy_to_iter = dm_dax_copy_to_iter, |
cdf6cdcd | 3162 | .zero_page_range = dm_dax_zero_page_range, |
f26c5719 DW |
3163 | }; |
3164 | ||
1da177e4 LT |
3165 | /* |
3166 | * module hooks | |
3167 | */ | |
3168 | module_init(dm_init); | |
3169 | module_exit(dm_exit); | |
3170 | ||
3171 | module_param(major, uint, 0); | |
3172 | MODULE_PARM_DESC(major, "The major number of the device mapper"); | |
f4790826 | 3173 | |
e8603136 MS |
3174 | module_param(reserved_bio_based_ios, uint, S_IRUGO | S_IWUSR); |
3175 | MODULE_PARM_DESC(reserved_bio_based_ios, "Reserved IOs in bio-based mempools"); | |
3176 | ||
115485e8 MS |
3177 | module_param(dm_numa_node, int, S_IRUGO | S_IWUSR); |
3178 | MODULE_PARM_DESC(dm_numa_node, "NUMA node for DM device memory allocations"); | |
3179 | ||
a666e5c0 MP |
3180 | module_param(swap_bios, int, S_IRUGO | S_IWUSR); |
3181 | MODULE_PARM_DESC(swap_bios, "Maximum allowed inflight swap IOs"); | |
3182 | ||
1da177e4 LT |
3183 | MODULE_DESCRIPTION(DM_NAME " driver"); |
3184 | MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>"); | |
3185 | MODULE_LICENSE("GPL"); |