Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2001, 2002 Sistina Software (UK) Limited. | |
784aae73 | 3 | * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
1da177e4 LT |
4 | * |
5 | * This file is released under the GPL. | |
6 | */ | |
7 | ||
4cc96131 MS |
8 | #include "dm-core.h" |
9 | #include "dm-rq.h" | |
51e5b2bd | 10 | #include "dm-uevent.h" |
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> |
55782138 | 31 | |
72d94861 AK |
32 | #define DM_MSG_PREFIX "core" |
33 | ||
60935eb2 MB |
34 | /* |
35 | * Cookies are numeric values sent with CHANGE and REMOVE | |
36 | * uevents while resuming, removing or renaming the device. | |
37 | */ | |
38 | #define DM_COOKIE_ENV_VAR_NAME "DM_COOKIE" | |
39 | #define DM_COOKIE_LENGTH 24 | |
40 | ||
1da177e4 LT |
41 | static const char *_name = DM_NAME; |
42 | ||
43 | static unsigned int major = 0; | |
44 | static unsigned int _major = 0; | |
45 | ||
d15b774c AK |
46 | static DEFINE_IDR(_minor_idr); |
47 | ||
f32c10b0 | 48 | static DEFINE_SPINLOCK(_minor_lock); |
2c140a24 MP |
49 | |
50 | static void do_deferred_remove(struct work_struct *w); | |
51 | ||
52 | static DECLARE_WORK(deferred_remove_work, do_deferred_remove); | |
53 | ||
acfe0ad7 MP |
54 | static struct workqueue_struct *deferred_remove_workqueue; |
55 | ||
93e6442c MP |
56 | atomic_t dm_global_event_nr = ATOMIC_INIT(0); |
57 | DECLARE_WAIT_QUEUE_HEAD(dm_global_eventq); | |
58 | ||
62e08243 MP |
59 | void dm_issue_global_event(void) |
60 | { | |
61 | atomic_inc(&dm_global_event_nr); | |
62 | wake_up(&dm_global_eventq); | |
63 | } | |
64 | ||
1da177e4 | 65 | /* |
64f52b0e | 66 | * One of these is allocated (on-stack) per original bio. |
1da177e4 | 67 | */ |
64f52b0e | 68 | struct clone_info { |
64f52b0e MS |
69 | struct dm_table *map; |
70 | struct bio *bio; | |
71 | struct dm_io *io; | |
72 | sector_t sector; | |
73 | unsigned sector_count; | |
74 | }; | |
75 | ||
76 | /* | |
77 | * One of these is allocated per clone bio. | |
78 | */ | |
79 | #define DM_TIO_MAGIC 7282014 | |
80 | struct dm_target_io { | |
81 | unsigned magic; | |
82 | struct dm_io *io; | |
83 | struct dm_target *ti; | |
84 | unsigned target_bio_nr; | |
85 | unsigned *len_ptr; | |
86 | bool inside_dm_io; | |
87 | struct bio clone; | |
88 | }; | |
89 | ||
1da177e4 | 90 | /* |
745dc570 | 91 | * One of these is allocated per original bio. |
64f52b0e | 92 | * It contains the first clone used for that original. |
1da177e4 | 93 | */ |
64f52b0e | 94 | #define DM_IO_MAGIC 5191977 |
1da177e4 | 95 | struct dm_io { |
64f52b0e | 96 | unsigned magic; |
1da177e4 | 97 | struct mapped_device *md; |
4e4cbee9 | 98 | blk_status_t status; |
1da177e4 | 99 | atomic_t io_count; |
745dc570 | 100 | struct bio *orig_bio; |
3eaf840e | 101 | unsigned long start_time; |
f88fb981 | 102 | spinlock_t endio_lock; |
fd2ed4d2 | 103 | struct dm_stats_aux stats_aux; |
64f52b0e MS |
104 | /* last member of dm_target_io is 'struct bio' */ |
105 | struct dm_target_io tio; | |
1da177e4 LT |
106 | }; |
107 | ||
64f52b0e MS |
108 | void *dm_per_bio_data(struct bio *bio, size_t data_size) |
109 | { | |
110 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); | |
111 | if (!tio->inside_dm_io) | |
112 | return (char *)bio - offsetof(struct dm_target_io, clone) - data_size; | |
113 | return (char *)bio - offsetof(struct dm_target_io, clone) - offsetof(struct dm_io, tio) - data_size; | |
114 | } | |
115 | EXPORT_SYMBOL_GPL(dm_per_bio_data); | |
116 | ||
117 | struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size) | |
118 | { | |
119 | struct dm_io *io = (struct dm_io *)((char *)data + data_size); | |
120 | if (io->magic == DM_IO_MAGIC) | |
121 | return (struct bio *)((char *)io + offsetof(struct dm_io, tio) + offsetof(struct dm_target_io, clone)); | |
122 | BUG_ON(io->magic != DM_TIO_MAGIC); | |
123 | return (struct bio *)((char *)io + offsetof(struct dm_target_io, clone)); | |
124 | } | |
125 | EXPORT_SYMBOL_GPL(dm_bio_from_per_bio_data); | |
126 | ||
127 | unsigned dm_bio_get_target_bio_nr(const struct bio *bio) | |
128 | { | |
129 | return container_of(bio, struct dm_target_io, clone)->target_bio_nr; | |
130 | } | |
131 | EXPORT_SYMBOL_GPL(dm_bio_get_target_bio_nr); | |
132 | ||
ba61fdd1 JM |
133 | #define MINOR_ALLOCED ((void *)-1) |
134 | ||
1da177e4 LT |
135 | /* |
136 | * Bits for the md->flags field. | |
137 | */ | |
1eb787ec | 138 | #define DMF_BLOCK_IO_FOR_SUSPEND 0 |
1da177e4 | 139 | #define DMF_SUSPENDED 1 |
aa8d7c2f | 140 | #define DMF_FROZEN 2 |
fba9f90e | 141 | #define DMF_FREEING 3 |
5c6bd75d | 142 | #define DMF_DELETING 4 |
2e93ccc1 | 143 | #define DMF_NOFLUSH_SUSPENDING 5 |
8ae12666 KO |
144 | #define DMF_DEFERRED_REMOVE 6 |
145 | #define DMF_SUSPENDED_INTERNALLY 7 | |
5df96f2b | 146 | #define DMF_POST_SUSPENDING 8 |
1da177e4 | 147 | |
115485e8 | 148 | #define DM_NUMA_NODE NUMA_NO_NODE |
115485e8 | 149 | static int dm_numa_node = DM_NUMA_NODE; |
faad87df | 150 | |
e6ee8c0b KU |
151 | /* |
152 | * For mempools pre-allocation at the table loading time. | |
153 | */ | |
154 | struct dm_md_mempools { | |
6f1c819c KO |
155 | struct bio_set bs; |
156 | struct bio_set io_bs; | |
e6ee8c0b KU |
157 | }; |
158 | ||
86f1152b BM |
159 | struct table_device { |
160 | struct list_head list; | |
b0b4d7c6 | 161 | refcount_t count; |
86f1152b BM |
162 | struct dm_dev dm_dev; |
163 | }; | |
164 | ||
e8603136 MS |
165 | /* |
166 | * Bio-based DM's mempools' reserved IOs set by the user. | |
167 | */ | |
4cc96131 | 168 | #define RESERVED_BIO_BASED_IOS 16 |
e8603136 MS |
169 | static unsigned reserved_bio_based_ios = RESERVED_BIO_BASED_IOS; |
170 | ||
115485e8 MS |
171 | static int __dm_get_module_param_int(int *module_param, int min, int max) |
172 | { | |
6aa7de05 | 173 | int param = READ_ONCE(*module_param); |
115485e8 MS |
174 | int modified_param = 0; |
175 | bool modified = true; | |
176 | ||
177 | if (param < min) | |
178 | modified_param = min; | |
179 | else if (param > max) | |
180 | modified_param = max; | |
181 | else | |
182 | modified = false; | |
183 | ||
184 | if (modified) { | |
185 | (void)cmpxchg(module_param, param, modified_param); | |
186 | param = modified_param; | |
187 | } | |
188 | ||
189 | return param; | |
190 | } | |
191 | ||
4cc96131 MS |
192 | unsigned __dm_get_module_param(unsigned *module_param, |
193 | unsigned def, unsigned max) | |
f4790826 | 194 | { |
6aa7de05 | 195 | unsigned param = READ_ONCE(*module_param); |
09c2d531 | 196 | unsigned modified_param = 0; |
f4790826 | 197 | |
09c2d531 MS |
198 | if (!param) |
199 | modified_param = def; | |
200 | else if (param > max) | |
201 | modified_param = max; | |
f4790826 | 202 | |
09c2d531 MS |
203 | if (modified_param) { |
204 | (void)cmpxchg(module_param, param, modified_param); | |
205 | param = modified_param; | |
f4790826 MS |
206 | } |
207 | ||
09c2d531 | 208 | return param; |
f4790826 MS |
209 | } |
210 | ||
e8603136 MS |
211 | unsigned dm_get_reserved_bio_based_ios(void) |
212 | { | |
09c2d531 | 213 | return __dm_get_module_param(&reserved_bio_based_ios, |
4cc96131 | 214 | RESERVED_BIO_BASED_IOS, DM_RESERVED_MAX_IOS); |
e8603136 MS |
215 | } |
216 | EXPORT_SYMBOL_GPL(dm_get_reserved_bio_based_ios); | |
217 | ||
115485e8 MS |
218 | static unsigned dm_get_numa_node(void) |
219 | { | |
220 | return __dm_get_module_param_int(&dm_numa_node, | |
221 | DM_NUMA_NODE, num_online_nodes() - 1); | |
222 | } | |
223 | ||
1da177e4 LT |
224 | static int __init local_init(void) |
225 | { | |
e689fbab | 226 | int r; |
1ae49ea2 | 227 | |
51e5b2bd | 228 | r = dm_uevent_init(); |
51157b4a | 229 | if (r) |
e689fbab | 230 | return r; |
51e5b2bd | 231 | |
acfe0ad7 MP |
232 | deferred_remove_workqueue = alloc_workqueue("kdmremove", WQ_UNBOUND, 1); |
233 | if (!deferred_remove_workqueue) { | |
234 | r = -ENOMEM; | |
235 | goto out_uevent_exit; | |
236 | } | |
237 | ||
1da177e4 LT |
238 | _major = major; |
239 | r = register_blkdev(_major, _name); | |
51157b4a | 240 | if (r < 0) |
acfe0ad7 | 241 | goto out_free_workqueue; |
1da177e4 LT |
242 | |
243 | if (!_major) | |
244 | _major = r; | |
245 | ||
246 | return 0; | |
51157b4a | 247 | |
acfe0ad7 MP |
248 | out_free_workqueue: |
249 | destroy_workqueue(deferred_remove_workqueue); | |
51157b4a KU |
250 | out_uevent_exit: |
251 | dm_uevent_exit(); | |
51157b4a KU |
252 | |
253 | return r; | |
1da177e4 LT |
254 | } |
255 | ||
256 | static void local_exit(void) | |
257 | { | |
2c140a24 | 258 | flush_scheduled_work(); |
acfe0ad7 | 259 | destroy_workqueue(deferred_remove_workqueue); |
2c140a24 | 260 | |
00d59405 | 261 | unregister_blkdev(_major, _name); |
51e5b2bd | 262 | dm_uevent_exit(); |
1da177e4 LT |
263 | |
264 | _major = 0; | |
265 | ||
266 | DMINFO("cleaned up"); | |
267 | } | |
268 | ||
b9249e55 | 269 | static int (*_inits[])(void) __initdata = { |
1da177e4 LT |
270 | local_init, |
271 | dm_target_init, | |
272 | dm_linear_init, | |
273 | dm_stripe_init, | |
952b3557 | 274 | dm_io_init, |
945fa4d2 | 275 | dm_kcopyd_init, |
1da177e4 | 276 | dm_interface_init, |
fd2ed4d2 | 277 | dm_statistics_init, |
1da177e4 LT |
278 | }; |
279 | ||
b9249e55 | 280 | static void (*_exits[])(void) = { |
1da177e4 LT |
281 | local_exit, |
282 | dm_target_exit, | |
283 | dm_linear_exit, | |
284 | dm_stripe_exit, | |
952b3557 | 285 | dm_io_exit, |
945fa4d2 | 286 | dm_kcopyd_exit, |
1da177e4 | 287 | dm_interface_exit, |
fd2ed4d2 | 288 | dm_statistics_exit, |
1da177e4 LT |
289 | }; |
290 | ||
291 | static int __init dm_init(void) | |
292 | { | |
293 | const int count = ARRAY_SIZE(_inits); | |
294 | ||
295 | int r, i; | |
296 | ||
297 | for (i = 0; i < count; i++) { | |
298 | r = _inits[i](); | |
299 | if (r) | |
300 | goto bad; | |
301 | } | |
302 | ||
303 | return 0; | |
304 | ||
305 | bad: | |
306 | while (i--) | |
307 | _exits[i](); | |
308 | ||
309 | return r; | |
310 | } | |
311 | ||
312 | static void __exit dm_exit(void) | |
313 | { | |
314 | int i = ARRAY_SIZE(_exits); | |
315 | ||
316 | while (i--) | |
317 | _exits[i](); | |
d15b774c AK |
318 | |
319 | /* | |
320 | * Should be empty by this point. | |
321 | */ | |
d15b774c | 322 | idr_destroy(&_minor_idr); |
1da177e4 LT |
323 | } |
324 | ||
325 | /* | |
326 | * Block device functions | |
327 | */ | |
432a212c MA |
328 | int dm_deleting_md(struct mapped_device *md) |
329 | { | |
330 | return test_bit(DMF_DELETING, &md->flags); | |
331 | } | |
332 | ||
fe5f9f2c | 333 | static int dm_blk_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
334 | { |
335 | struct mapped_device *md; | |
336 | ||
fba9f90e JM |
337 | spin_lock(&_minor_lock); |
338 | ||
fe5f9f2c | 339 | md = bdev->bd_disk->private_data; |
fba9f90e JM |
340 | if (!md) |
341 | goto out; | |
342 | ||
5c6bd75d | 343 | if (test_bit(DMF_FREEING, &md->flags) || |
432a212c | 344 | dm_deleting_md(md)) { |
fba9f90e JM |
345 | md = NULL; |
346 | goto out; | |
347 | } | |
348 | ||
1da177e4 | 349 | dm_get(md); |
5c6bd75d | 350 | atomic_inc(&md->open_count); |
fba9f90e JM |
351 | out: |
352 | spin_unlock(&_minor_lock); | |
353 | ||
354 | return md ? 0 : -ENXIO; | |
1da177e4 LT |
355 | } |
356 | ||
db2a144b | 357 | static void dm_blk_close(struct gendisk *disk, fmode_t mode) |
1da177e4 | 358 | { |
63a4f065 | 359 | struct mapped_device *md; |
6e9624b8 | 360 | |
4a1aeb98 MB |
361 | spin_lock(&_minor_lock); |
362 | ||
63a4f065 MS |
363 | md = disk->private_data; |
364 | if (WARN_ON(!md)) | |
365 | goto out; | |
366 | ||
2c140a24 MP |
367 | if (atomic_dec_and_test(&md->open_count) && |
368 | (test_bit(DMF_DEFERRED_REMOVE, &md->flags))) | |
acfe0ad7 | 369 | queue_work(deferred_remove_workqueue, &deferred_remove_work); |
2c140a24 | 370 | |
1da177e4 | 371 | dm_put(md); |
63a4f065 | 372 | out: |
4a1aeb98 | 373 | spin_unlock(&_minor_lock); |
1da177e4 LT |
374 | } |
375 | ||
5c6bd75d AK |
376 | int dm_open_count(struct mapped_device *md) |
377 | { | |
378 | return atomic_read(&md->open_count); | |
379 | } | |
380 | ||
381 | /* | |
382 | * Guarantees nothing is using the device before it's deleted. | |
383 | */ | |
2c140a24 | 384 | int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred) |
5c6bd75d AK |
385 | { |
386 | int r = 0; | |
387 | ||
388 | spin_lock(&_minor_lock); | |
389 | ||
2c140a24 | 390 | if (dm_open_count(md)) { |
5c6bd75d | 391 | r = -EBUSY; |
2c140a24 MP |
392 | if (mark_deferred) |
393 | set_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
394 | } else if (only_deferred && !test_bit(DMF_DEFERRED_REMOVE, &md->flags)) | |
395 | r = -EEXIST; | |
5c6bd75d AK |
396 | else |
397 | set_bit(DMF_DELETING, &md->flags); | |
398 | ||
399 | spin_unlock(&_minor_lock); | |
400 | ||
401 | return r; | |
402 | } | |
403 | ||
2c140a24 MP |
404 | int dm_cancel_deferred_remove(struct mapped_device *md) |
405 | { | |
406 | int r = 0; | |
407 | ||
408 | spin_lock(&_minor_lock); | |
409 | ||
410 | if (test_bit(DMF_DELETING, &md->flags)) | |
411 | r = -EBUSY; | |
412 | else | |
413 | clear_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
414 | ||
415 | spin_unlock(&_minor_lock); | |
416 | ||
417 | return r; | |
418 | } | |
419 | ||
420 | static void do_deferred_remove(struct work_struct *w) | |
421 | { | |
422 | dm_deferred_remove(); | |
423 | } | |
424 | ||
3ac51e74 DW |
425 | static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
426 | { | |
427 | struct mapped_device *md = bdev->bd_disk->private_data; | |
428 | ||
429 | return dm_get_geometry(md, geo); | |
430 | } | |
431 | ||
d4100351 CH |
432 | #ifdef CONFIG_BLK_DEV_ZONED |
433 | int dm_report_zones_cb(struct blk_zone *zone, unsigned int idx, void *data) | |
434 | { | |
435 | struct dm_report_zones_args *args = data; | |
436 | sector_t sector_diff = args->tgt->begin - args->start; | |
437 | ||
438 | /* | |
439 | * Ignore zones beyond the target range. | |
440 | */ | |
441 | if (zone->start >= args->start + args->tgt->len) | |
442 | return 0; | |
443 | ||
444 | /* | |
445 | * Remap the start sector and write pointer position of the zone | |
446 | * to match its position in the target range. | |
447 | */ | |
448 | zone->start += sector_diff; | |
449 | if (zone->type != BLK_ZONE_TYPE_CONVENTIONAL) { | |
450 | if (zone->cond == BLK_ZONE_COND_FULL) | |
451 | zone->wp = zone->start + zone->len; | |
452 | else if (zone->cond == BLK_ZONE_COND_EMPTY) | |
453 | zone->wp = zone->start; | |
454 | else | |
455 | zone->wp += sector_diff; | |
456 | } | |
457 | ||
458 | args->next_sector = zone->start + zone->len; | |
459 | return args->orig_cb(zone, args->zone_idx++, args->orig_data); | |
460 | } | |
461 | EXPORT_SYMBOL_GPL(dm_report_zones_cb); | |
462 | ||
e76239a3 | 463 | static int dm_blk_report_zones(struct gendisk *disk, sector_t sector, |
d4100351 | 464 | unsigned int nr_zones, report_zones_cb cb, void *data) |
e76239a3 | 465 | { |
e76239a3 | 466 | struct mapped_device *md = disk->private_data; |
e76239a3 CH |
467 | struct dm_table *map; |
468 | int srcu_idx, ret; | |
d4100351 CH |
469 | struct dm_report_zones_args args = { |
470 | .next_sector = sector, | |
471 | .orig_data = data, | |
472 | .orig_cb = cb, | |
473 | }; | |
e76239a3 CH |
474 | |
475 | if (dm_suspended_md(md)) | |
476 | return -EAGAIN; | |
477 | ||
478 | map = dm_get_live_table(md, &srcu_idx); | |
89478335 SS |
479 | if (!map) { |
480 | ret = -EIO; | |
481 | goto out; | |
482 | } | |
e76239a3 | 483 | |
d4100351 CH |
484 | do { |
485 | struct dm_target *tgt; | |
e76239a3 | 486 | |
d4100351 CH |
487 | tgt = dm_table_find_target(map, args.next_sector); |
488 | if (WARN_ON_ONCE(!tgt->type->report_zones)) { | |
489 | ret = -EIO; | |
490 | goto out; | |
491 | } | |
e76239a3 | 492 | |
d4100351 | 493 | args.tgt = tgt; |
a9cb9f41 JT |
494 | ret = tgt->type->report_zones(tgt, &args, |
495 | nr_zones - args.zone_idx); | |
d4100351 CH |
496 | if (ret < 0) |
497 | goto out; | |
498 | } while (args.zone_idx < nr_zones && | |
499 | args.next_sector < get_capacity(disk)); | |
e76239a3 | 500 | |
d4100351 | 501 | ret = args.zone_idx; |
e76239a3 CH |
502 | out: |
503 | dm_put_live_table(md, srcu_idx); | |
504 | return ret; | |
e76239a3 | 505 | } |
d4100351 CH |
506 | #else |
507 | #define dm_blk_report_zones NULL | |
508 | #endif /* CONFIG_BLK_DEV_ZONED */ | |
e76239a3 | 509 | |
971888c4 | 510 | static int dm_prepare_ioctl(struct mapped_device *md, int *srcu_idx, |
5bd5e8d8 | 511 | struct block_device **bdev) |
aa129a22 | 512 | { |
66482026 | 513 | struct dm_target *tgt; |
6c182cd8 | 514 | struct dm_table *map; |
971888c4 | 515 | int r; |
aa129a22 | 516 | |
6c182cd8 | 517 | retry: |
e56f81e0 | 518 | r = -ENOTTY; |
971888c4 | 519 | map = dm_get_live_table(md, srcu_idx); |
aa129a22 | 520 | if (!map || !dm_table_get_size(map)) |
971888c4 | 521 | return r; |
aa129a22 MB |
522 | |
523 | /* We only support devices that have a single target */ | |
524 | if (dm_table_get_num_targets(map) != 1) | |
971888c4 | 525 | return r; |
aa129a22 | 526 | |
66482026 MS |
527 | tgt = dm_table_get_target(map, 0); |
528 | if (!tgt->type->prepare_ioctl) | |
971888c4 | 529 | return r; |
519049af | 530 | |
971888c4 MS |
531 | if (dm_suspended_md(md)) |
532 | return -EAGAIN; | |
aa129a22 | 533 | |
5bd5e8d8 | 534 | r = tgt->type->prepare_ioctl(tgt, bdev); |
5bbbfdf6 | 535 | if (r == -ENOTCONN && !fatal_signal_pending(current)) { |
971888c4 | 536 | dm_put_live_table(md, *srcu_idx); |
6c182cd8 HR |
537 | msleep(10); |
538 | goto retry; | |
539 | } | |
971888c4 | 540 | |
e56f81e0 CH |
541 | return r; |
542 | } | |
543 | ||
971888c4 | 544 | static void dm_unprepare_ioctl(struct mapped_device *md, int srcu_idx) |
971888c4 MS |
545 | { |
546 | dm_put_live_table(md, srcu_idx); | |
547 | } | |
548 | ||
e56f81e0 CH |
549 | static int dm_blk_ioctl(struct block_device *bdev, fmode_t mode, |
550 | unsigned int cmd, unsigned long arg) | |
551 | { | |
552 | struct mapped_device *md = bdev->bd_disk->private_data; | |
971888c4 | 553 | int r, srcu_idx; |
e56f81e0 | 554 | |
5bd5e8d8 | 555 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
e56f81e0 | 556 | if (r < 0) |
971888c4 | 557 | goto out; |
6c182cd8 | 558 | |
e56f81e0 CH |
559 | if (r > 0) { |
560 | /* | |
e980f623 CH |
561 | * Target determined this ioctl is being issued against a |
562 | * subset of the parent bdev; require extra privileges. | |
e56f81e0 | 563 | */ |
e980f623 | 564 | if (!capable(CAP_SYS_RAWIO)) { |
0378c625 | 565 | DMDEBUG_LIMIT( |
e980f623 CH |
566 | "%s: sending ioctl %x to DM device without required privilege.", |
567 | current->comm, cmd); | |
568 | r = -ENOIOCTLCMD; | |
e56f81e0 | 569 | goto out; |
e980f623 | 570 | } |
e56f81e0 | 571 | } |
6c182cd8 | 572 | |
a7cb3d2f CH |
573 | if (!bdev->bd_disk->fops->ioctl) |
574 | r = -ENOTTY; | |
575 | else | |
576 | r = bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg); | |
e56f81e0 | 577 | out: |
971888c4 | 578 | dm_unprepare_ioctl(md, srcu_idx); |
aa129a22 MB |
579 | return r; |
580 | } | |
581 | ||
7465d7ac MS |
582 | u64 dm_start_time_ns_from_clone(struct bio *bio) |
583 | { | |
584 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); | |
585 | struct dm_io *io = tio->io; | |
586 | ||
587 | return jiffies_to_nsecs(io->start_time); | |
588 | } | |
589 | EXPORT_SYMBOL_GPL(dm_start_time_ns_from_clone); | |
590 | ||
591 | static void start_io_acct(struct dm_io *io) | |
592 | { | |
593 | struct mapped_device *md = io->md; | |
594 | struct bio *bio = io->orig_bio; | |
595 | ||
596 | io->start_time = bio_start_io_acct(bio); | |
597 | if (unlikely(dm_stats_used(&md->stats))) | |
598 | dm_stats_account_io(&md->stats, bio_data_dir(bio), | |
599 | bio->bi_iter.bi_sector, bio_sectors(bio), | |
600 | false, 0, &io->stats_aux); | |
601 | } | |
602 | ||
603 | static void end_io_acct(struct dm_io *io) | |
604 | { | |
605 | struct mapped_device *md = io->md; | |
606 | struct bio *bio = io->orig_bio; | |
607 | unsigned long duration = jiffies - io->start_time; | |
608 | ||
609 | bio_end_io_acct(bio, io->start_time); | |
610 | ||
611 | if (unlikely(dm_stats_used(&md->stats))) | |
612 | dm_stats_account_io(&md->stats, bio_data_dir(bio), | |
613 | bio->bi_iter.bi_sector, bio_sectors(bio), | |
614 | true, duration, &io->stats_aux); | |
615 | ||
616 | /* nudge anyone waiting on suspend queue */ | |
617 | if (unlikely(wq_has_sleeper(&md->wait))) | |
618 | wake_up(&md->wait); | |
619 | } | |
978e51ba MS |
620 | |
621 | static struct dm_io *alloc_io(struct mapped_device *md, struct bio *bio) | |
1da177e4 | 622 | { |
64f52b0e MS |
623 | struct dm_io *io; |
624 | struct dm_target_io *tio; | |
625 | struct bio *clone; | |
626 | ||
6f1c819c | 627 | clone = bio_alloc_bioset(GFP_NOIO, 0, &md->io_bs); |
64f52b0e MS |
628 | if (!clone) |
629 | return NULL; | |
630 | ||
631 | tio = container_of(clone, struct dm_target_io, clone); | |
632 | tio->inside_dm_io = true; | |
633 | tio->io = NULL; | |
634 | ||
635 | io = container_of(tio, struct dm_io, tio); | |
636 | io->magic = DM_IO_MAGIC; | |
978e51ba MS |
637 | io->status = 0; |
638 | atomic_set(&io->io_count, 1); | |
639 | io->orig_bio = bio; | |
640 | io->md = md; | |
641 | spin_lock_init(&io->endio_lock); | |
642 | ||
643 | start_io_acct(io); | |
64f52b0e MS |
644 | |
645 | return io; | |
1da177e4 LT |
646 | } |
647 | ||
028867ac | 648 | static void free_io(struct mapped_device *md, struct dm_io *io) |
1da177e4 | 649 | { |
64f52b0e MS |
650 | bio_put(&io->tio.clone); |
651 | } | |
652 | ||
653 | static struct dm_target_io *alloc_tio(struct clone_info *ci, struct dm_target *ti, | |
654 | unsigned target_bio_nr, gfp_t gfp_mask) | |
655 | { | |
656 | struct dm_target_io *tio; | |
657 | ||
658 | if (!ci->io->tio.io) { | |
659 | /* the dm_target_io embedded in ci->io is available */ | |
660 | tio = &ci->io->tio; | |
661 | } else { | |
6f1c819c | 662 | struct bio *clone = bio_alloc_bioset(gfp_mask, 0, &ci->io->md->bs); |
64f52b0e MS |
663 | if (!clone) |
664 | return NULL; | |
665 | ||
666 | tio = container_of(clone, struct dm_target_io, clone); | |
667 | tio->inside_dm_io = false; | |
668 | } | |
669 | ||
670 | tio->magic = DM_TIO_MAGIC; | |
671 | tio->io = ci->io; | |
672 | tio->ti = ti; | |
673 | tio->target_bio_nr = target_bio_nr; | |
674 | ||
675 | return tio; | |
1da177e4 LT |
676 | } |
677 | ||
cfae7529 | 678 | static void free_tio(struct dm_target_io *tio) |
1da177e4 | 679 | { |
64f52b0e MS |
680 | if (tio->inside_dm_io) |
681 | return; | |
dba14160 | 682 | bio_put(&tio->clone); |
1da177e4 LT |
683 | } |
684 | ||
685 | /* | |
686 | * Add the bio to the list of deferred io. | |
687 | */ | |
92c63902 | 688 | static void queue_io(struct mapped_device *md, struct bio *bio) |
1da177e4 | 689 | { |
05447420 | 690 | unsigned long flags; |
1da177e4 | 691 | |
05447420 | 692 | spin_lock_irqsave(&md->deferred_lock, flags); |
1da177e4 | 693 | bio_list_add(&md->deferred, bio); |
05447420 | 694 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
6a8736d1 | 695 | queue_work(md->wq, &md->work); |
1da177e4 LT |
696 | } |
697 | ||
698 | /* | |
699 | * Everyone (including functions in this file), should use this | |
700 | * function to access the md->map field, and make sure they call | |
83d5e5b0 | 701 | * dm_put_live_table() when finished. |
1da177e4 | 702 | */ |
83d5e5b0 | 703 | struct dm_table *dm_get_live_table(struct mapped_device *md, int *srcu_idx) __acquires(md->io_barrier) |
1da177e4 | 704 | { |
83d5e5b0 MP |
705 | *srcu_idx = srcu_read_lock(&md->io_barrier); |
706 | ||
707 | return srcu_dereference(md->map, &md->io_barrier); | |
708 | } | |
1da177e4 | 709 | |
83d5e5b0 MP |
710 | void dm_put_live_table(struct mapped_device *md, int srcu_idx) __releases(md->io_barrier) |
711 | { | |
712 | srcu_read_unlock(&md->io_barrier, srcu_idx); | |
713 | } | |
714 | ||
715 | void dm_sync_table(struct mapped_device *md) | |
716 | { | |
717 | synchronize_srcu(&md->io_barrier); | |
718 | synchronize_rcu_expedited(); | |
719 | } | |
720 | ||
721 | /* | |
722 | * A fast alternative to dm_get_live_table/dm_put_live_table. | |
723 | * The caller must not block between these two functions. | |
724 | */ | |
725 | static struct dm_table *dm_get_live_table_fast(struct mapped_device *md) __acquires(RCU) | |
726 | { | |
727 | rcu_read_lock(); | |
728 | return rcu_dereference(md->map); | |
729 | } | |
1da177e4 | 730 | |
83d5e5b0 MP |
731 | static void dm_put_live_table_fast(struct mapped_device *md) __releases(RCU) |
732 | { | |
733 | rcu_read_unlock(); | |
1da177e4 LT |
734 | } |
735 | ||
971888c4 MS |
736 | static char *_dm_claim_ptr = "I belong to device-mapper"; |
737 | ||
86f1152b BM |
738 | /* |
739 | * Open a table device so we can use it as a map destination. | |
740 | */ | |
741 | static int open_table_device(struct table_device *td, dev_t dev, | |
742 | struct mapped_device *md) | |
743 | { | |
86f1152b BM |
744 | struct block_device *bdev; |
745 | ||
746 | int r; | |
747 | ||
748 | BUG_ON(td->dm_dev.bdev); | |
749 | ||
519049af | 750 | bdev = blkdev_get_by_dev(dev, td->dm_dev.mode | FMODE_EXCL, _dm_claim_ptr); |
86f1152b BM |
751 | if (IS_ERR(bdev)) |
752 | return PTR_ERR(bdev); | |
753 | ||
754 | r = bd_link_disk_holder(bdev, dm_disk(md)); | |
755 | if (r) { | |
756 | blkdev_put(bdev, td->dm_dev.mode | FMODE_EXCL); | |
757 | return r; | |
758 | } | |
759 | ||
760 | td->dm_dev.bdev = bdev; | |
817bf402 | 761 | td->dm_dev.dax_dev = dax_get_by_host(bdev->bd_disk->disk_name); |
86f1152b BM |
762 | return 0; |
763 | } | |
764 | ||
765 | /* | |
766 | * Close a table device that we've been using. | |
767 | */ | |
768 | static void close_table_device(struct table_device *td, struct mapped_device *md) | |
769 | { | |
770 | if (!td->dm_dev.bdev) | |
771 | return; | |
772 | ||
773 | bd_unlink_disk_holder(td->dm_dev.bdev, dm_disk(md)); | |
774 | blkdev_put(td->dm_dev.bdev, td->dm_dev.mode | FMODE_EXCL); | |
817bf402 | 775 | put_dax(td->dm_dev.dax_dev); |
86f1152b | 776 | td->dm_dev.bdev = NULL; |
817bf402 | 777 | td->dm_dev.dax_dev = NULL; |
86f1152b BM |
778 | } |
779 | ||
780 | static struct table_device *find_table_device(struct list_head *l, dev_t dev, | |
8454fca4 SS |
781 | fmode_t mode) |
782 | { | |
86f1152b BM |
783 | struct table_device *td; |
784 | ||
785 | list_for_each_entry(td, l, list) | |
786 | if (td->dm_dev.bdev->bd_dev == dev && td->dm_dev.mode == mode) | |
787 | return td; | |
788 | ||
789 | return NULL; | |
790 | } | |
791 | ||
792 | int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode, | |
8454fca4 SS |
793 | struct dm_dev **result) |
794 | { | |
86f1152b BM |
795 | int r; |
796 | struct table_device *td; | |
797 | ||
798 | mutex_lock(&md->table_devices_lock); | |
799 | td = find_table_device(&md->table_devices, dev, mode); | |
800 | if (!td) { | |
115485e8 | 801 | td = kmalloc_node(sizeof(*td), GFP_KERNEL, md->numa_node_id); |
86f1152b BM |
802 | if (!td) { |
803 | mutex_unlock(&md->table_devices_lock); | |
804 | return -ENOMEM; | |
805 | } | |
806 | ||
807 | td->dm_dev.mode = mode; | |
808 | td->dm_dev.bdev = NULL; | |
809 | ||
810 | if ((r = open_table_device(td, dev, md))) { | |
811 | mutex_unlock(&md->table_devices_lock); | |
812 | kfree(td); | |
813 | return r; | |
814 | } | |
815 | ||
816 | format_dev_t(td->dm_dev.name, dev); | |
817 | ||
b0b4d7c6 | 818 | refcount_set(&td->count, 1); |
86f1152b | 819 | list_add(&td->list, &md->table_devices); |
b0b4d7c6 ER |
820 | } else { |
821 | refcount_inc(&td->count); | |
86f1152b | 822 | } |
86f1152b BM |
823 | mutex_unlock(&md->table_devices_lock); |
824 | ||
825 | *result = &td->dm_dev; | |
826 | return 0; | |
827 | } | |
828 | EXPORT_SYMBOL_GPL(dm_get_table_device); | |
829 | ||
830 | void dm_put_table_device(struct mapped_device *md, struct dm_dev *d) | |
831 | { | |
832 | struct table_device *td = container_of(d, struct table_device, dm_dev); | |
833 | ||
834 | mutex_lock(&md->table_devices_lock); | |
b0b4d7c6 | 835 | if (refcount_dec_and_test(&td->count)) { |
86f1152b BM |
836 | close_table_device(td, md); |
837 | list_del(&td->list); | |
838 | kfree(td); | |
839 | } | |
840 | mutex_unlock(&md->table_devices_lock); | |
841 | } | |
842 | EXPORT_SYMBOL(dm_put_table_device); | |
843 | ||
844 | static void free_table_devices(struct list_head *devices) | |
845 | { | |
846 | struct list_head *tmp, *next; | |
847 | ||
848 | list_for_each_safe(tmp, next, devices) { | |
849 | struct table_device *td = list_entry(tmp, struct table_device, list); | |
850 | ||
851 | DMWARN("dm_destroy: %s still exists with %d references", | |
b0b4d7c6 | 852 | td->dm_dev.name, refcount_read(&td->count)); |
86f1152b BM |
853 | kfree(td); |
854 | } | |
855 | } | |
856 | ||
3ac51e74 DW |
857 | /* |
858 | * Get the geometry associated with a dm device | |
859 | */ | |
860 | int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo) | |
861 | { | |
862 | *geo = md->geometry; | |
863 | ||
864 | return 0; | |
865 | } | |
866 | ||
867 | /* | |
868 | * Set the geometry of a device. | |
869 | */ | |
870 | int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo) | |
871 | { | |
872 | sector_t sz = (sector_t)geo->cylinders * geo->heads * geo->sectors; | |
873 | ||
874 | if (geo->start > sz) { | |
875 | DMWARN("Start sector is beyond the geometry limits."); | |
876 | return -EINVAL; | |
877 | } | |
878 | ||
879 | md->geometry = *geo; | |
880 | ||
881 | return 0; | |
882 | } | |
883 | ||
2e93ccc1 KU |
884 | static int __noflush_suspending(struct mapped_device *md) |
885 | { | |
886 | return test_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); | |
887 | } | |
888 | ||
1da177e4 LT |
889 | /* |
890 | * Decrements the number of outstanding ios that a bio has been | |
891 | * cloned into, completing the original io if necc. | |
892 | */ | |
4e4cbee9 | 893 | static void dec_pending(struct dm_io *io, blk_status_t error) |
1da177e4 | 894 | { |
2e93ccc1 | 895 | unsigned long flags; |
4e4cbee9 | 896 | blk_status_t io_error; |
b35f8caa MB |
897 | struct bio *bio; |
898 | struct mapped_device *md = io->md; | |
2e93ccc1 KU |
899 | |
900 | /* Push-back supersedes any I/O errors */ | |
f88fb981 KU |
901 | if (unlikely(error)) { |
902 | spin_lock_irqsave(&io->endio_lock, flags); | |
745dc570 | 903 | if (!(io->status == BLK_STS_DM_REQUEUE && __noflush_suspending(md))) |
4e4cbee9 | 904 | io->status = error; |
f88fb981 KU |
905 | spin_unlock_irqrestore(&io->endio_lock, flags); |
906 | } | |
1da177e4 LT |
907 | |
908 | if (atomic_dec_and_test(&io->io_count)) { | |
4e4cbee9 | 909 | if (io->status == BLK_STS_DM_REQUEUE) { |
2e93ccc1 KU |
910 | /* |
911 | * Target requested pushing back the I/O. | |
2e93ccc1 | 912 | */ |
022c2611 | 913 | spin_lock_irqsave(&md->deferred_lock, flags); |
6a8736d1 | 914 | if (__noflush_suspending(md)) |
745dc570 MS |
915 | /* NOTE early return due to BLK_STS_DM_REQUEUE below */ |
916 | bio_list_add_head(&md->deferred, io->orig_bio); | |
6a8736d1 | 917 | else |
2e93ccc1 | 918 | /* noflush suspend was interrupted. */ |
4e4cbee9 | 919 | io->status = BLK_STS_IOERR; |
022c2611 | 920 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
2e93ccc1 KU |
921 | } |
922 | ||
4e4cbee9 | 923 | io_error = io->status; |
745dc570 | 924 | bio = io->orig_bio; |
6a8736d1 TH |
925 | end_io_acct(io); |
926 | free_io(md, io); | |
927 | ||
4e4cbee9 | 928 | if (io_error == BLK_STS_DM_REQUEUE) |
6a8736d1 | 929 | return; |
2e93ccc1 | 930 | |
1eff9d32 | 931 | if ((bio->bi_opf & REQ_PREFLUSH) && bio->bi_iter.bi_size) { |
af7e466a | 932 | /* |
6a8736d1 | 933 | * Preflush done for flush with data, reissue |
28a8f0d3 | 934 | * without REQ_PREFLUSH. |
af7e466a | 935 | */ |
1eff9d32 | 936 | bio->bi_opf &= ~REQ_PREFLUSH; |
6a8736d1 | 937 | queue_io(md, bio); |
af7e466a | 938 | } else { |
b372d360 | 939 | /* done with normal IO or empty flush */ |
8dd601fa N |
940 | if (io_error) |
941 | bio->bi_status = io_error; | |
4246a0b6 | 942 | bio_endio(bio); |
b35f8caa | 943 | } |
1da177e4 LT |
944 | } |
945 | } | |
946 | ||
bcb44433 MS |
947 | void disable_discard(struct mapped_device *md) |
948 | { | |
949 | struct queue_limits *limits = dm_get_queue_limits(md); | |
950 | ||
951 | /* device doesn't really support DISCARD, disable it */ | |
952 | limits->max_discard_sectors = 0; | |
953 | blk_queue_flag_clear(QUEUE_FLAG_DISCARD, md->queue); | |
954 | } | |
955 | ||
4cc96131 | 956 | void disable_write_same(struct mapped_device *md) |
7eee4ae2 MS |
957 | { |
958 | struct queue_limits *limits = dm_get_queue_limits(md); | |
959 | ||
960 | /* device doesn't really support WRITE SAME, disable it */ | |
961 | limits->max_write_same_sectors = 0; | |
962 | } | |
963 | ||
ac62d620 CH |
964 | void disable_write_zeroes(struct mapped_device *md) |
965 | { | |
966 | struct queue_limits *limits = dm_get_queue_limits(md); | |
967 | ||
968 | /* device doesn't really support WRITE ZEROES, disable it */ | |
969 | limits->max_write_zeroes_sectors = 0; | |
970 | } | |
971 | ||
4246a0b6 | 972 | static void clone_endio(struct bio *bio) |
1da177e4 | 973 | { |
4e4cbee9 | 974 | blk_status_t error = bio->bi_status; |
bfc6d41c | 975 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); |
b35f8caa | 976 | struct dm_io *io = tio->io; |
9faf400f | 977 | struct mapped_device *md = tio->io->md; |
1da177e4 | 978 | dm_endio_fn endio = tio->ti->type->end_io; |
415c79e1 | 979 | struct bio *orig_bio = io->orig_bio; |
1da177e4 | 980 | |
9c37de29 | 981 | if (unlikely(error == BLK_STS_TARGET)) { |
bcb44433 MS |
982 | if (bio_op(bio) == REQ_OP_DISCARD && |
983 | !bio->bi_disk->queue->limits.max_discard_sectors) | |
984 | disable_discard(md); | |
985 | else if (bio_op(bio) == REQ_OP_WRITE_SAME && | |
986 | !bio->bi_disk->queue->limits.max_write_same_sectors) | |
ac62d620 | 987 | disable_write_same(md); |
bcb44433 MS |
988 | else if (bio_op(bio) == REQ_OP_WRITE_ZEROES && |
989 | !bio->bi_disk->queue->limits.max_write_zeroes_sectors) | |
ac62d620 CH |
990 | disable_write_zeroes(md); |
991 | } | |
7eee4ae2 | 992 | |
415c79e1 JT |
993 | /* |
994 | * For zone-append bios get offset in zone of the written | |
995 | * sector and add that to the original bio sector pos. | |
996 | */ | |
997 | if (bio_op(orig_bio) == REQ_OP_ZONE_APPEND) { | |
998 | sector_t written_sector = bio->bi_iter.bi_sector; | |
999 | struct request_queue *q = orig_bio->bi_disk->queue; | |
1000 | u64 mask = (u64)blk_queue_zone_sectors(q) - 1; | |
1001 | ||
1002 | orig_bio->bi_iter.bi_sector += written_sector & mask; | |
1003 | } | |
1004 | ||
1be56909 | 1005 | if (endio) { |
4e4cbee9 | 1006 | int r = endio(tio->ti, bio, &error); |
1be56909 CH |
1007 | switch (r) { |
1008 | case DM_ENDIO_REQUEUE: | |
4e4cbee9 | 1009 | error = BLK_STS_DM_REQUEUE; |
df561f66 | 1010 | fallthrough; |
1be56909 CH |
1011 | case DM_ENDIO_DONE: |
1012 | break; | |
1013 | case DM_ENDIO_INCOMPLETE: | |
1014 | /* The target will handle the io */ | |
1015 | return; | |
1016 | default: | |
1017 | DMWARN("unimplemented target endio return value: %d", r); | |
1018 | BUG(); | |
1019 | } | |
1020 | } | |
1021 | ||
cfae7529 | 1022 | free_tio(tio); |
b35f8caa | 1023 | dec_pending(io, error); |
1da177e4 LT |
1024 | } |
1025 | ||
56a67df7 MS |
1026 | /* |
1027 | * Return maximum size of I/O possible at the supplied sector up to the current | |
1028 | * target boundary. | |
1029 | */ | |
3720281d MS |
1030 | static inline sector_t max_io_len_target_boundary(struct dm_target *ti, |
1031 | sector_t target_offset) | |
56a67df7 | 1032 | { |
56a67df7 MS |
1033 | return ti->len - target_offset; |
1034 | } | |
1035 | ||
3720281d | 1036 | static sector_t max_io_len(struct dm_target *ti, sector_t sector) |
1da177e4 | 1037 | { |
3720281d MS |
1038 | sector_t target_offset = dm_target_offset(ti, sector); |
1039 | sector_t len = max_io_len_target_boundary(ti, target_offset); | |
5091cdec | 1040 | sector_t max_len; |
1da177e4 LT |
1041 | |
1042 | /* | |
3ee16db3 MS |
1043 | * Does the target need to split IO even further? |
1044 | * - varied (per target) IO splitting is a tenet of DM; this | |
1045 | * explains why stacked chunk_sectors based splitting via | |
1046 | * blk_max_size_offset() isn't possible here. So pass in | |
1047 | * ti->max_io_len to override stacked chunk_sectors. | |
1da177e4 | 1048 | */ |
3ee16db3 MS |
1049 | if (ti->max_io_len) { |
1050 | max_len = blk_max_size_offset(ti->table->md->queue, | |
1051 | target_offset, ti->max_io_len); | |
1052 | if (len > max_len) | |
1053 | len = max_len; | |
1054 | } | |
1da177e4 LT |
1055 | |
1056 | return len; | |
1057 | } | |
1058 | ||
542f9038 MS |
1059 | int dm_set_target_max_io_len(struct dm_target *ti, sector_t len) |
1060 | { | |
1061 | if (len > UINT_MAX) { | |
1062 | DMERR("Specified maximum size of target IO (%llu) exceeds limit (%u)", | |
1063 | (unsigned long long)len, UINT_MAX); | |
1064 | ti->error = "Maximum size of target IO is too large"; | |
1065 | return -EINVAL; | |
1066 | } | |
1067 | ||
75ae1936 | 1068 | ti->max_io_len = (uint32_t) len; |
542f9038 MS |
1069 | |
1070 | return 0; | |
1071 | } | |
1072 | EXPORT_SYMBOL_GPL(dm_set_target_max_io_len); | |
1073 | ||
f26c5719 | 1074 | static struct dm_target *dm_dax_get_live_target(struct mapped_device *md, |
3d97c829 MS |
1075 | sector_t sector, int *srcu_idx) |
1076 | __acquires(md->io_barrier) | |
545ed20e | 1077 | { |
545ed20e TK |
1078 | struct dm_table *map; |
1079 | struct dm_target *ti; | |
545ed20e | 1080 | |
f26c5719 | 1081 | map = dm_get_live_table(md, srcu_idx); |
545ed20e | 1082 | if (!map) |
f26c5719 | 1083 | return NULL; |
545ed20e TK |
1084 | |
1085 | ti = dm_table_find_target(map, sector); | |
123d87d5 | 1086 | if (!ti) |
f26c5719 | 1087 | return NULL; |
545ed20e | 1088 | |
f26c5719 DW |
1089 | return ti; |
1090 | } | |
545ed20e | 1091 | |
f26c5719 | 1092 | static long dm_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, |
3d97c829 | 1093 | long nr_pages, void **kaddr, pfn_t *pfn) |
f26c5719 DW |
1094 | { |
1095 | struct mapped_device *md = dax_get_private(dax_dev); | |
1096 | sector_t sector = pgoff * PAGE_SECTORS; | |
1097 | struct dm_target *ti; | |
1098 | long len, ret = -EIO; | |
1099 | int srcu_idx; | |
545ed20e | 1100 | |
f26c5719 | 1101 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); |
545ed20e | 1102 | |
f26c5719 DW |
1103 | if (!ti) |
1104 | goto out; | |
1105 | if (!ti->type->direct_access) | |
1106 | goto out; | |
3720281d | 1107 | len = max_io_len(ti, sector) / PAGE_SECTORS; |
f26c5719 DW |
1108 | if (len < 1) |
1109 | goto out; | |
1110 | nr_pages = min(len, nr_pages); | |
dbc62659 | 1111 | ret = ti->type->direct_access(ti, pgoff, nr_pages, kaddr, pfn); |
817bf402 | 1112 | |
f26c5719 | 1113 | out: |
545ed20e | 1114 | dm_put_live_table(md, srcu_idx); |
f26c5719 DW |
1115 | |
1116 | return ret; | |
545ed20e TK |
1117 | } |
1118 | ||
7bf7eac8 DW |
1119 | static bool dm_dax_supported(struct dax_device *dax_dev, struct block_device *bdev, |
1120 | int blocksize, sector_t start, sector_t len) | |
1121 | { | |
1122 | struct mapped_device *md = dax_get_private(dax_dev); | |
1123 | struct dm_table *map; | |
02186d88 | 1124 | bool ret = false; |
7bf7eac8 | 1125 | int srcu_idx; |
7bf7eac8 DW |
1126 | |
1127 | map = dm_get_live_table(md, &srcu_idx); | |
1128 | if (!map) | |
02186d88 | 1129 | goto out; |
7bf7eac8 | 1130 | |
2e9ee095 | 1131 | ret = dm_table_supports_dax(map, device_supports_dax, &blocksize); |
7bf7eac8 | 1132 | |
02186d88 | 1133 | out: |
7bf7eac8 DW |
1134 | dm_put_live_table(md, srcu_idx); |
1135 | ||
1136 | return ret; | |
1137 | } | |
1138 | ||
7e026c8c | 1139 | static size_t dm_dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, |
3d97c829 | 1140 | void *addr, size_t bytes, struct iov_iter *i) |
7e026c8c DW |
1141 | { |
1142 | struct mapped_device *md = dax_get_private(dax_dev); | |
1143 | sector_t sector = pgoff * PAGE_SECTORS; | |
1144 | struct dm_target *ti; | |
1145 | long ret = 0; | |
1146 | int srcu_idx; | |
1147 | ||
1148 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); | |
1149 | ||
1150 | if (!ti) | |
1151 | goto out; | |
1152 | if (!ti->type->dax_copy_from_iter) { | |
1153 | ret = copy_from_iter(addr, bytes, i); | |
1154 | goto out; | |
1155 | } | |
1156 | ret = ti->type->dax_copy_from_iter(ti, pgoff, addr, bytes, i); | |
1157 | out: | |
1158 | dm_put_live_table(md, srcu_idx); | |
1159 | ||
1160 | return ret; | |
1161 | } | |
1162 | ||
b3a9a0c3 DW |
1163 | static size_t dm_dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, |
1164 | void *addr, size_t bytes, struct iov_iter *i) | |
1165 | { | |
1166 | struct mapped_device *md = dax_get_private(dax_dev); | |
1167 | sector_t sector = pgoff * PAGE_SECTORS; | |
1168 | struct dm_target *ti; | |
1169 | long ret = 0; | |
1170 | int srcu_idx; | |
1171 | ||
1172 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); | |
1173 | ||
1174 | if (!ti) | |
1175 | goto out; | |
1176 | if (!ti->type->dax_copy_to_iter) { | |
1177 | ret = copy_to_iter(addr, bytes, i); | |
1178 | goto out; | |
1179 | } | |
1180 | ret = ti->type->dax_copy_to_iter(ti, pgoff, addr, bytes, i); | |
1181 | out: | |
1182 | dm_put_live_table(md, srcu_idx); | |
1183 | ||
1184 | return ret; | |
1185 | } | |
1186 | ||
cdf6cdcd VG |
1187 | static int dm_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, |
1188 | size_t nr_pages) | |
1189 | { | |
1190 | struct mapped_device *md = dax_get_private(dax_dev); | |
1191 | sector_t sector = pgoff * PAGE_SECTORS; | |
1192 | struct dm_target *ti; | |
1193 | int ret = -EIO; | |
1194 | int srcu_idx; | |
1195 | ||
1196 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); | |
1197 | ||
1198 | if (!ti) | |
1199 | goto out; | |
1200 | if (WARN_ON(!ti->type->dax_zero_page_range)) { | |
1201 | /* | |
1202 | * ->zero_page_range() is mandatory dax operation. If we are | |
1203 | * here, something is wrong. | |
1204 | */ | |
cdf6cdcd VG |
1205 | goto out; |
1206 | } | |
1207 | ret = ti->type->dax_zero_page_range(ti, pgoff, nr_pages); | |
cdf6cdcd VG |
1208 | out: |
1209 | dm_put_live_table(md, srcu_idx); | |
1210 | ||
1211 | return ret; | |
1212 | } | |
1213 | ||
1dd40c3e MP |
1214 | /* |
1215 | * A target may call dm_accept_partial_bio only from the map routine. It is | |
2e2d6f7e AJ |
1216 | * allowed for all bio types except REQ_PREFLUSH, REQ_OP_ZONE_RESET, |
1217 | * REQ_OP_ZONE_OPEN, REQ_OP_ZONE_CLOSE and REQ_OP_ZONE_FINISH. | |
1dd40c3e MP |
1218 | * |
1219 | * dm_accept_partial_bio informs the dm that the target only wants to process | |
1220 | * additional n_sectors sectors of the bio and the rest of the data should be | |
1221 | * sent in a next bio. | |
1222 | * | |
1223 | * A diagram that explains the arithmetics: | |
1224 | * +--------------------+---------------+-------+ | |
1225 | * | 1 | 2 | 3 | | |
1226 | * +--------------------+---------------+-------+ | |
1227 | * | |
1228 | * <-------------- *tio->len_ptr ---------------> | |
1229 | * <------- bi_size -------> | |
1230 | * <-- n_sectors --> | |
1231 | * | |
1232 | * Region 1 was already iterated over with bio_advance or similar function. | |
1233 | * (it may be empty if the target doesn't use bio_advance) | |
1234 | * Region 2 is the remaining bio size that the target wants to process. | |
1235 | * (it may be empty if region 1 is non-empty, although there is no reason | |
1236 | * to make it empty) | |
1237 | * The target requires that region 3 is to be sent in the next bio. | |
1238 | * | |
1239 | * If the target wants to receive multiple copies of the bio (via num_*bios, etc), | |
1240 | * the partially processed part (the sum of regions 1+2) must be the same for all | |
1241 | * copies of the bio. | |
1242 | */ | |
1243 | void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors) | |
1244 | { | |
1245 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); | |
1246 | unsigned bi_size = bio->bi_iter.bi_size >> SECTOR_SHIFT; | |
1eff9d32 | 1247 | BUG_ON(bio->bi_opf & REQ_PREFLUSH); |
1dd40c3e MP |
1248 | BUG_ON(bi_size > *tio->len_ptr); |
1249 | BUG_ON(n_sectors > bi_size); | |
1250 | *tio->len_ptr -= bi_size - n_sectors; | |
1251 | bio->bi_iter.bi_size = n_sectors << SECTOR_SHIFT; | |
1252 | } | |
1253 | EXPORT_SYMBOL_GPL(dm_accept_partial_bio); | |
1254 | ||
978e51ba | 1255 | static blk_qc_t __map_bio(struct dm_target_io *tio) |
1da177e4 LT |
1256 | { |
1257 | int r; | |
2056a782 | 1258 | sector_t sector; |
dba14160 | 1259 | struct bio *clone = &tio->clone; |
64f52b0e | 1260 | struct dm_io *io = tio->io; |
bd2a49b8 | 1261 | struct dm_target *ti = tio->ti; |
978e51ba | 1262 | blk_qc_t ret = BLK_QC_T_NONE; |
1da177e4 | 1263 | |
1da177e4 | 1264 | clone->bi_end_io = clone_endio; |
1da177e4 LT |
1265 | |
1266 | /* | |
1267 | * Map the clone. If r == 0 we don't need to do | |
1268 | * anything, the target has assumed ownership of | |
1269 | * this io. | |
1270 | */ | |
64f52b0e | 1271 | atomic_inc(&io->io_count); |
4f024f37 | 1272 | sector = clone->bi_iter.bi_sector; |
d67a5f4b | 1273 | |
7de3ee57 | 1274 | r = ti->type->map(ti, clone); |
846785e6 CH |
1275 | switch (r) { |
1276 | case DM_MAPIO_SUBMITTED: | |
1277 | break; | |
1278 | case DM_MAPIO_REMAPPED: | |
1da177e4 | 1279 | /* the bio has been remapped so dispatch it */ |
1c02fca6 | 1280 | trace_block_bio_remap(clone, bio_dev(io->orig_bio), sector); |
5a6c35f9 | 1281 | ret = submit_bio_noacct(clone); |
846785e6 CH |
1282 | break; |
1283 | case DM_MAPIO_KILL: | |
4e4cbee9 | 1284 | free_tio(tio); |
64f52b0e | 1285 | dec_pending(io, BLK_STS_IOERR); |
4e4cbee9 | 1286 | break; |
846785e6 | 1287 | case DM_MAPIO_REQUEUE: |
cfae7529 | 1288 | free_tio(tio); |
64f52b0e | 1289 | dec_pending(io, BLK_STS_DM_REQUEUE); |
846785e6 CH |
1290 | break; |
1291 | default: | |
45cbcd79 KU |
1292 | DMWARN("unimplemented target map return value: %d", r); |
1293 | BUG(); | |
1da177e4 | 1294 | } |
1da177e4 | 1295 | |
978e51ba | 1296 | return ret; |
1da177e4 | 1297 | } |
1da177e4 | 1298 | |
e0d6609a | 1299 | static void bio_setup_sector(struct bio *bio, sector_t sector, unsigned len) |
bd2a49b8 | 1300 | { |
4f024f37 KO |
1301 | bio->bi_iter.bi_sector = sector; |
1302 | bio->bi_iter.bi_size = to_bytes(len); | |
1da177e4 LT |
1303 | } |
1304 | ||
1305 | /* | |
1306 | * Creates a bio that consists of range of complete bvecs. | |
1307 | */ | |
c80914e8 MS |
1308 | static int clone_bio(struct dm_target_io *tio, struct bio *bio, |
1309 | sector_t sector, unsigned len) | |
1da177e4 | 1310 | { |
dba14160 | 1311 | struct bio *clone = &tio->clone; |
07560151 | 1312 | int r; |
1da177e4 | 1313 | |
1c3b13e6 KO |
1314 | __bio_clone_fast(clone, bio); |
1315 | ||
07560151 EB |
1316 | r = bio_crypt_clone(clone, bio, GFP_NOIO); |
1317 | if (r < 0) | |
1318 | return r; | |
a892c8d5 | 1319 | |
57c36519 | 1320 | if (bio_integrity(bio)) { |
e2460f2a MP |
1321 | if (unlikely(!dm_target_has_integrity(tio->ti->type) && |
1322 | !dm_target_passes_integrity(tio->ti->type))) { | |
1323 | DMWARN("%s: the target %s doesn't support integrity data.", | |
1324 | dm_device_name(tio->io->md), | |
1325 | tio->ti->type->name); | |
1326 | return -EIO; | |
1327 | } | |
1328 | ||
1329 | r = bio_integrity_clone(clone, bio, GFP_NOIO); | |
c80914e8 MS |
1330 | if (r < 0) |
1331 | return r; | |
1332 | } | |
bd2a49b8 | 1333 | |
fa8db494 MS |
1334 | bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector)); |
1335 | clone->bi_iter.bi_size = to_bytes(len); | |
1336 | ||
1337 | if (bio_integrity(bio)) | |
1338 | bio_integrity_trim(clone); | |
c80914e8 MS |
1339 | |
1340 | return 0; | |
1da177e4 LT |
1341 | } |
1342 | ||
318716dd MS |
1343 | static void alloc_multiple_bios(struct bio_list *blist, struct clone_info *ci, |
1344 | struct dm_target *ti, unsigned num_bios) | |
f9ab94ce | 1345 | { |
dba14160 | 1346 | struct dm_target_io *tio; |
318716dd | 1347 | int try; |
dba14160 | 1348 | |
318716dd MS |
1349 | if (!num_bios) |
1350 | return; | |
f9ab94ce | 1351 | |
318716dd MS |
1352 | if (num_bios == 1) { |
1353 | tio = alloc_tio(ci, ti, 0, GFP_NOIO); | |
1354 | bio_list_add(blist, &tio->clone); | |
1355 | return; | |
1356 | } | |
9015df24 | 1357 | |
318716dd MS |
1358 | for (try = 0; try < 2; try++) { |
1359 | int bio_nr; | |
1360 | struct bio *bio; | |
1361 | ||
1362 | if (try) | |
bc02cdbe | 1363 | mutex_lock(&ci->io->md->table_devices_lock); |
318716dd MS |
1364 | for (bio_nr = 0; bio_nr < num_bios; bio_nr++) { |
1365 | tio = alloc_tio(ci, ti, bio_nr, try ? GFP_NOIO : GFP_NOWAIT); | |
1366 | if (!tio) | |
1367 | break; | |
1368 | ||
1369 | bio_list_add(blist, &tio->clone); | |
1370 | } | |
1371 | if (try) | |
bc02cdbe | 1372 | mutex_unlock(&ci->io->md->table_devices_lock); |
318716dd MS |
1373 | if (bio_nr == num_bios) |
1374 | return; | |
1375 | ||
1376 | while ((bio = bio_list_pop(blist))) { | |
1377 | tio = container_of(bio, struct dm_target_io, clone); | |
1378 | free_tio(tio); | |
1379 | } | |
1380 | } | |
9015df24 AK |
1381 | } |
1382 | ||
978e51ba MS |
1383 | static blk_qc_t __clone_and_map_simple_bio(struct clone_info *ci, |
1384 | struct dm_target_io *tio, unsigned *len) | |
9015df24 | 1385 | { |
dba14160 | 1386 | struct bio *clone = &tio->clone; |
9015df24 | 1387 | |
1dd40c3e MP |
1388 | tio->len_ptr = len; |
1389 | ||
99778273 | 1390 | __bio_clone_fast(clone, ci->bio); |
bd2a49b8 | 1391 | if (len) |
1dd40c3e | 1392 | bio_setup_sector(clone, ci->sector, *len); |
f9ab94ce | 1393 | |
978e51ba | 1394 | return __map_bio(tio); |
f9ab94ce MP |
1395 | } |
1396 | ||
14fe594d | 1397 | static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti, |
1dd40c3e | 1398 | unsigned num_bios, unsigned *len) |
06a426ce | 1399 | { |
318716dd MS |
1400 | struct bio_list blist = BIO_EMPTY_LIST; |
1401 | struct bio *bio; | |
1402 | struct dm_target_io *tio; | |
1403 | ||
1404 | alloc_multiple_bios(&blist, ci, ti, num_bios); | |
06a426ce | 1405 | |
318716dd MS |
1406 | while ((bio = bio_list_pop(&blist))) { |
1407 | tio = container_of(bio, struct dm_target_io, clone); | |
978e51ba | 1408 | (void) __clone_and_map_simple_bio(ci, tio, len); |
318716dd | 1409 | } |
06a426ce MS |
1410 | } |
1411 | ||
14fe594d | 1412 | static int __send_empty_flush(struct clone_info *ci) |
f9ab94ce | 1413 | { |
06a426ce | 1414 | unsigned target_nr = 0; |
f9ab94ce | 1415 | struct dm_target *ti; |
828678b8 MS |
1416 | struct bio flush_bio; |
1417 | ||
1418 | /* | |
1419 | * Use an on-stack bio for this, it's safe since we don't | |
1420 | * need to reference it after submit. It's just used as | |
1421 | * the basis for the clone(s). | |
1422 | */ | |
1423 | bio_init(&flush_bio, NULL, 0); | |
1424 | flush_bio.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC; | |
47d95102 CH |
1425 | flush_bio.bi_disk = ci->io->md->disk; |
1426 | bio_associate_blkg(&flush_bio); | |
1427 | ||
828678b8 MS |
1428 | ci->bio = &flush_bio; |
1429 | ci->sector_count = 0; | |
f9ab94ce | 1430 | |
b372d360 | 1431 | BUG_ON(bio_has_data(ci->bio)); |
f9ab94ce | 1432 | while ((ti = dm_table_get_target(ci->map, target_nr++))) |
1dd40c3e | 1433 | __send_duplicate_bios(ci, ti, ti->num_flush_bios, NULL); |
828678b8 MS |
1434 | |
1435 | bio_uninit(ci->bio); | |
f9ab94ce MP |
1436 | return 0; |
1437 | } | |
1438 | ||
c80914e8 | 1439 | static int __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti, |
f31c21e4 | 1440 | sector_t sector, unsigned *len) |
5ae89a87 | 1441 | { |
dba14160 | 1442 | struct bio *bio = ci->bio; |
5ae89a87 | 1443 | struct dm_target_io *tio; |
f31c21e4 | 1444 | int r; |
5ae89a87 | 1445 | |
318716dd | 1446 | tio = alloc_tio(ci, ti, 0, GFP_NOIO); |
f31c21e4 N |
1447 | tio->len_ptr = len; |
1448 | r = clone_bio(tio, bio, sector, *len); | |
1449 | if (r < 0) { | |
1450 | free_tio(tio); | |
1451 | return r; | |
b0d8ed4d | 1452 | } |
978e51ba | 1453 | (void) __map_bio(tio); |
c80914e8 | 1454 | |
f31c21e4 | 1455 | return 0; |
5ae89a87 MS |
1456 | } |
1457 | ||
3d7f4562 | 1458 | static int __send_changing_extent_only(struct clone_info *ci, struct dm_target *ti, |
61697a6a | 1459 | unsigned num_bios) |
ba1cbad9 | 1460 | { |
51b86f9a | 1461 | unsigned len; |
ba1cbad9 | 1462 | |
3d7f4562 MS |
1463 | /* |
1464 | * Even though the device advertised support for this type of | |
1465 | * request, that does not mean every target supports it, and | |
1466 | * reconfiguration might also have changed that since the | |
1467 | * check was performed. | |
1468 | */ | |
3d7f4562 MS |
1469 | if (!num_bios) |
1470 | return -EOPNOTSUPP; | |
ba1cbad9 | 1471 | |
3720281d MS |
1472 | len = min_t(sector_t, ci->sector_count, |
1473 | max_io_len_target_boundary(ti, dm_target_offset(ti, ci->sector))); | |
51b86f9a | 1474 | |
3d7f4562 | 1475 | __send_duplicate_bios(ci, ti, num_bios, &len); |
e262f347 | 1476 | |
3d7f4562 MS |
1477 | ci->sector += len; |
1478 | ci->sector_count -= len; | |
5ae89a87 MS |
1479 | |
1480 | return 0; | |
ba1cbad9 MS |
1481 | } |
1482 | ||
568c73a3 MS |
1483 | static bool is_abnormal_io(struct bio *bio) |
1484 | { | |
1485 | bool r = false; | |
1486 | ||
1487 | switch (bio_op(bio)) { | |
1488 | case REQ_OP_DISCARD: | |
1489 | case REQ_OP_SECURE_ERASE: | |
1490 | case REQ_OP_WRITE_SAME: | |
1491 | case REQ_OP_WRITE_ZEROES: | |
1492 | r = true; | |
1493 | break; | |
1494 | } | |
1495 | ||
1496 | return r; | |
1497 | } | |
1498 | ||
0519c71e MS |
1499 | static bool __process_abnormal_io(struct clone_info *ci, struct dm_target *ti, |
1500 | int *result) | |
1501 | { | |
1502 | struct bio *bio = ci->bio; | |
9679b5a7 | 1503 | unsigned num_bios = 0; |
0519c71e | 1504 | |
9679b5a7 MS |
1505 | switch (bio_op(bio)) { |
1506 | case REQ_OP_DISCARD: | |
1507 | num_bios = ti->num_discard_bios; | |
1508 | break; | |
1509 | case REQ_OP_SECURE_ERASE: | |
1510 | num_bios = ti->num_secure_erase_bios; | |
1511 | break; | |
1512 | case REQ_OP_WRITE_SAME: | |
1513 | num_bios = ti->num_write_same_bios; | |
1514 | break; | |
1515 | case REQ_OP_WRITE_ZEROES: | |
1516 | num_bios = ti->num_write_zeroes_bios; | |
1517 | break; | |
1518 | default: | |
0519c71e | 1519 | return false; |
9679b5a7 | 1520 | } |
0519c71e | 1521 | |
9679b5a7 | 1522 | *result = __send_changing_extent_only(ci, ti, num_bios); |
0519c71e MS |
1523 | return true; |
1524 | } | |
1525 | ||
e4c93811 AK |
1526 | /* |
1527 | * Select the correct strategy for processing a non-flush bio. | |
1528 | */ | |
14fe594d | 1529 | static int __split_and_process_non_flush(struct clone_info *ci) |
0ce65797 | 1530 | { |
512875bd | 1531 | struct dm_target *ti; |
1c3b13e6 | 1532 | unsigned len; |
c80914e8 | 1533 | int r; |
0ce65797 | 1534 | |
512875bd | 1535 | ti = dm_table_find_target(ci->map, ci->sector); |
123d87d5 | 1536 | if (!ti) |
512875bd JN |
1537 | return -EIO; |
1538 | ||
568c73a3 | 1539 | if (__process_abnormal_io(ci, ti, &r)) |
0519c71e | 1540 | return r; |
3d7f4562 | 1541 | |
3720281d | 1542 | len = min_t(sector_t, max_io_len(ti, ci->sector), ci->sector_count); |
0ce65797 | 1543 | |
c80914e8 MS |
1544 | r = __clone_and_map_data_bio(ci, ti, ci->sector, &len); |
1545 | if (r < 0) | |
1546 | return r; | |
0ce65797 | 1547 | |
1c3b13e6 KO |
1548 | ci->sector += len; |
1549 | ci->sector_count -= len; | |
0ce65797 | 1550 | |
1c3b13e6 | 1551 | return 0; |
0ce65797 MS |
1552 | } |
1553 | ||
978e51ba MS |
1554 | static void init_clone_info(struct clone_info *ci, struct mapped_device *md, |
1555 | struct dm_table *map, struct bio *bio) | |
1556 | { | |
1557 | ci->map = map; | |
1558 | ci->io = alloc_io(md, bio); | |
1559 | ci->sector = bio->bi_iter.bi_sector; | |
1560 | } | |
1561 | ||
a1e1cb72 MS |
1562 | #define __dm_part_stat_sub(part, field, subnd) \ |
1563 | (part_stat_get(part, field) -= (subnd)) | |
1564 | ||
1da177e4 | 1565 | /* |
14fe594d | 1566 | * Entry point to split a bio into clones and submit them to the targets. |
1da177e4 | 1567 | */ |
978e51ba MS |
1568 | static blk_qc_t __split_and_process_bio(struct mapped_device *md, |
1569 | struct dm_table *map, struct bio *bio) | |
0ce65797 | 1570 | { |
1da177e4 | 1571 | struct clone_info ci; |
978e51ba | 1572 | blk_qc_t ret = BLK_QC_T_NONE; |
512875bd | 1573 | int error = 0; |
1da177e4 | 1574 | |
978e51ba | 1575 | init_clone_info(&ci, md, map, bio); |
0ce65797 | 1576 | |
1eff9d32 | 1577 | if (bio->bi_opf & REQ_PREFLUSH) { |
14fe594d | 1578 | error = __send_empty_flush(&ci); |
b372d360 | 1579 | /* dec_pending submits any data associated with flush */ |
2e2d6f7e | 1580 | } else if (op_is_zone_mgmt(bio_op(bio))) { |
a4aa5e56 DLM |
1581 | ci.bio = bio; |
1582 | ci.sector_count = 0; | |
1583 | error = __split_and_process_non_flush(&ci); | |
b372d360 | 1584 | } else { |
6a8736d1 | 1585 | ci.bio = bio; |
d87f4c14 | 1586 | ci.sector_count = bio_sectors(bio); |
18a25da8 | 1587 | while (ci.sector_count && !error) { |
14fe594d | 1588 | error = __split_and_process_non_flush(&ci); |
985eabdc | 1589 | if (ci.sector_count && !error) { |
18a25da8 | 1590 | /* |
ed00aabd | 1591 | * Remainder must be passed to submit_bio_noacct() |
18a25da8 N |
1592 | * so that it gets handled *after* bios already submitted |
1593 | * have been completely processed. | |
1594 | * We take a clone of the original to store in | |
745dc570 | 1595 | * ci.io->orig_bio to be used by end_io_acct() and |
18a25da8 | 1596 | * for dec_pending to use for completion handling. |
18a25da8 | 1597 | */ |
f21c601a MS |
1598 | struct bio *b = bio_split(bio, bio_sectors(bio) - ci.sector_count, |
1599 | GFP_NOIO, &md->queue->bio_split); | |
745dc570 | 1600 | ci.io->orig_bio = b; |
a1e1cb72 MS |
1601 | |
1602 | /* | |
1603 | * Adjust IO stats for each split, otherwise upon queue | |
1604 | * reentry there will be redundant IO accounting. | |
1605 | * NOTE: this is a stop-gap fix, a proper fix involves | |
1606 | * significant refactoring of DM core's bio splitting | |
1607 | * (by eliminating DM's splitting and just using bio_split) | |
1608 | */ | |
1609 | part_stat_lock(); | |
8446fe92 | 1610 | __dm_part_stat_sub(dm_disk(md)->part0, |
a1e1cb72 MS |
1611 | sectors[op_stat_group(bio_op(bio))], ci.sector_count); |
1612 | part_stat_unlock(); | |
1613 | ||
18a25da8 | 1614 | bio_chain(b, bio); |
eb6f7f7c | 1615 | trace_block_split(b, bio->bi_iter.bi_sector); |
ed00aabd | 1616 | ret = submit_bio_noacct(bio); |
18a25da8 N |
1617 | break; |
1618 | } | |
1619 | } | |
d87f4c14 | 1620 | } |
0ce65797 | 1621 | |
1da177e4 | 1622 | /* drop the extra reference count */ |
54385bf7 | 1623 | dec_pending(ci.io, errno_to_blk_status(error)); |
978e51ba | 1624 | return ret; |
0ce65797 MS |
1625 | } |
1626 | ||
c62b37d9 | 1627 | static blk_qc_t dm_submit_bio(struct bio *bio) |
cec47e3d | 1628 | { |
c4a59c4e | 1629 | struct mapped_device *md = bio->bi_disk->private_data; |
978e51ba | 1630 | blk_qc_t ret = BLK_QC_T_NONE; |
83d5e5b0 MP |
1631 | int srcu_idx; |
1632 | struct dm_table *map; | |
cec47e3d | 1633 | |
83d5e5b0 | 1634 | map = dm_get_live_table(md, &srcu_idx); |
b2abdb1b MS |
1635 | if (unlikely(!map)) { |
1636 | DMERR_LIMIT("%s: mapping table unavailable, erroring io", | |
1637 | dm_device_name(md)); | |
1638 | bio_io_error(bio); | |
1639 | goto out; | |
1640 | } | |
29e4013d | 1641 | |
b2abdb1b | 1642 | /* If suspended, queue this IO for later */ |
6a8736d1 | 1643 | if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags))) { |
6abc4946 KK |
1644 | if (bio->bi_opf & REQ_NOWAIT) |
1645 | bio_wouldblock_error(bio); | |
b2abdb1b | 1646 | else if (bio->bi_opf & REQ_RAHEAD) |
54d9a1b4 | 1647 | bio_io_error(bio); |
b2abdb1b MS |
1648 | else |
1649 | queue_io(md, bio); | |
1650 | goto out; | |
cec47e3d | 1651 | } |
1da177e4 | 1652 | |
b2abdb1b MS |
1653 | /* |
1654 | * Use blk_queue_split() for abnormal IO (e.g. discard, writesame, etc) | |
1655 | * otherwise associated queue_limits won't be imposed. | |
1656 | */ | |
1657 | if (is_abnormal_io(bio)) | |
1658 | blk_queue_split(&bio); | |
978e51ba | 1659 | |
9c37de29 | 1660 | ret = __split_and_process_bio(md, map, bio); |
b2abdb1b | 1661 | out: |
83d5e5b0 | 1662 | dm_put_live_table(md, srcu_idx); |
978e51ba MS |
1663 | return ret; |
1664 | } | |
1665 | ||
1da177e4 LT |
1666 | /*----------------------------------------------------------------- |
1667 | * An IDR is used to keep track of allocated minor numbers. | |
1668 | *---------------------------------------------------------------*/ | |
2b06cfff | 1669 | static void free_minor(int minor) |
1da177e4 | 1670 | { |
f32c10b0 | 1671 | spin_lock(&_minor_lock); |
1da177e4 | 1672 | idr_remove(&_minor_idr, minor); |
f32c10b0 | 1673 | spin_unlock(&_minor_lock); |
1da177e4 LT |
1674 | } |
1675 | ||
1676 | /* | |
1677 | * See if the device with a specific minor # is free. | |
1678 | */ | |
cf13ab8e | 1679 | static int specific_minor(int minor) |
1da177e4 | 1680 | { |
c9d76be6 | 1681 | int r; |
1da177e4 LT |
1682 | |
1683 | if (minor >= (1 << MINORBITS)) | |
1684 | return -EINVAL; | |
1685 | ||
c9d76be6 | 1686 | idr_preload(GFP_KERNEL); |
f32c10b0 | 1687 | spin_lock(&_minor_lock); |
1da177e4 | 1688 | |
c9d76be6 | 1689 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, minor, minor + 1, GFP_NOWAIT); |
1da177e4 | 1690 | |
f32c10b0 | 1691 | spin_unlock(&_minor_lock); |
c9d76be6 TH |
1692 | idr_preload_end(); |
1693 | if (r < 0) | |
1694 | return r == -ENOSPC ? -EBUSY : r; | |
1695 | return 0; | |
1da177e4 LT |
1696 | } |
1697 | ||
cf13ab8e | 1698 | static int next_free_minor(int *minor) |
1da177e4 | 1699 | { |
c9d76be6 | 1700 | int r; |
62f75c2f | 1701 | |
c9d76be6 | 1702 | idr_preload(GFP_KERNEL); |
f32c10b0 | 1703 | spin_lock(&_minor_lock); |
1da177e4 | 1704 | |
c9d76be6 | 1705 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, 0, 1 << MINORBITS, GFP_NOWAIT); |
1da177e4 | 1706 | |
f32c10b0 | 1707 | spin_unlock(&_minor_lock); |
c9d76be6 TH |
1708 | idr_preload_end(); |
1709 | if (r < 0) | |
1710 | return r; | |
1711 | *minor = r; | |
1712 | return 0; | |
1da177e4 LT |
1713 | } |
1714 | ||
83d5cde4 | 1715 | static const struct block_device_operations dm_blk_dops; |
681cc5e8 | 1716 | static const struct block_device_operations dm_rq_blk_dops; |
f26c5719 | 1717 | static const struct dax_operations dm_dax_ops; |
1da177e4 | 1718 | |
53d5914f MP |
1719 | static void dm_wq_work(struct work_struct *work); |
1720 | ||
0f20972f MS |
1721 | static void cleanup_mapped_device(struct mapped_device *md) |
1722 | { | |
0f20972f MS |
1723 | if (md->wq) |
1724 | destroy_workqueue(md->wq); | |
6f1c819c KO |
1725 | bioset_exit(&md->bs); |
1726 | bioset_exit(&md->io_bs); | |
0f20972f | 1727 | |
f26c5719 DW |
1728 | if (md->dax_dev) { |
1729 | kill_dax(md->dax_dev); | |
1730 | put_dax(md->dax_dev); | |
1731 | md->dax_dev = NULL; | |
1732 | } | |
1733 | ||
0f20972f MS |
1734 | if (md->disk) { |
1735 | spin_lock(&_minor_lock); | |
1736 | md->disk->private_data = NULL; | |
1737 | spin_unlock(&_minor_lock); | |
0f20972f MS |
1738 | del_gendisk(md->disk); |
1739 | put_disk(md->disk); | |
1740 | } | |
1741 | ||
1742 | if (md->queue) | |
1743 | blk_cleanup_queue(md->queue); | |
1744 | ||
d09960b0 TE |
1745 | cleanup_srcu_struct(&md->io_barrier); |
1746 | ||
d5ffebdd MS |
1747 | mutex_destroy(&md->suspend_lock); |
1748 | mutex_destroy(&md->type_lock); | |
1749 | mutex_destroy(&md->table_devices_lock); | |
1750 | ||
4cc96131 | 1751 | dm_mq_cleanup_mapped_device(md); |
0f20972f MS |
1752 | } |
1753 | ||
1da177e4 LT |
1754 | /* |
1755 | * Allocate and initialise a blank device with a given minor. | |
1756 | */ | |
2b06cfff | 1757 | static struct mapped_device *alloc_dev(int minor) |
1da177e4 | 1758 | { |
115485e8 MS |
1759 | int r, numa_node_id = dm_get_numa_node(); |
1760 | struct mapped_device *md; | |
ba61fdd1 | 1761 | void *old_md; |
1da177e4 | 1762 | |
856eb091 | 1763 | md = kvzalloc_node(sizeof(*md), GFP_KERNEL, numa_node_id); |
1da177e4 LT |
1764 | if (!md) { |
1765 | DMWARN("unable to allocate device, out of memory."); | |
1766 | return NULL; | |
1767 | } | |
1768 | ||
10da4f79 | 1769 | if (!try_module_get(THIS_MODULE)) |
6ed7ade8 | 1770 | goto bad_module_get; |
10da4f79 | 1771 | |
1da177e4 | 1772 | /* get a minor number for the dev */ |
2b06cfff | 1773 | if (minor == DM_ANY_MINOR) |
cf13ab8e | 1774 | r = next_free_minor(&minor); |
2b06cfff | 1775 | else |
cf13ab8e | 1776 | r = specific_minor(minor); |
1da177e4 | 1777 | if (r < 0) |
6ed7ade8 | 1778 | goto bad_minor; |
1da177e4 | 1779 | |
83d5e5b0 MP |
1780 | r = init_srcu_struct(&md->io_barrier); |
1781 | if (r < 0) | |
1782 | goto bad_io_barrier; | |
1783 | ||
115485e8 | 1784 | md->numa_node_id = numa_node_id; |
591ddcfc | 1785 | md->init_tio_pdu = false; |
a5664dad | 1786 | md->type = DM_TYPE_NONE; |
e61290a4 | 1787 | mutex_init(&md->suspend_lock); |
a5664dad | 1788 | mutex_init(&md->type_lock); |
86f1152b | 1789 | mutex_init(&md->table_devices_lock); |
022c2611 | 1790 | spin_lock_init(&md->deferred_lock); |
1da177e4 | 1791 | atomic_set(&md->holders, 1); |
5c6bd75d | 1792 | atomic_set(&md->open_count, 0); |
1da177e4 | 1793 | atomic_set(&md->event_nr, 0); |
7a8c3d3b MA |
1794 | atomic_set(&md->uevent_seq, 0); |
1795 | INIT_LIST_HEAD(&md->uevent_list); | |
86f1152b | 1796 | INIT_LIST_HEAD(&md->table_devices); |
7a8c3d3b | 1797 | spin_lock_init(&md->uevent_lock); |
1da177e4 | 1798 | |
47ace7e0 | 1799 | /* |
c62b37d9 CH |
1800 | * default to bio-based until DM table is loaded and md->type |
1801 | * established. If request-based table is loaded: blk-mq will | |
1802 | * override accordingly. | |
47ace7e0 | 1803 | */ |
c62b37d9 | 1804 | md->queue = blk_alloc_queue(numa_node_id); |
3d745ea5 CH |
1805 | if (!md->queue) |
1806 | goto bad; | |
1da177e4 | 1807 | |
c12c9a3c | 1808 | md->disk = alloc_disk_node(1, md->numa_node_id); |
1da177e4 | 1809 | if (!md->disk) |
0f20972f | 1810 | goto bad; |
1da177e4 | 1811 | |
f0b04115 | 1812 | init_waitqueue_head(&md->wait); |
53d5914f | 1813 | INIT_WORK(&md->work, dm_wq_work); |
f0b04115 | 1814 | init_waitqueue_head(&md->eventq); |
2995fa78 | 1815 | init_completion(&md->kobj_holder.completion); |
f0b04115 | 1816 | |
1da177e4 LT |
1817 | md->disk->major = _major; |
1818 | md->disk->first_minor = minor; | |
1819 | md->disk->fops = &dm_blk_dops; | |
1820 | md->disk->queue = md->queue; | |
1821 | md->disk->private_data = md; | |
1822 | sprintf(md->disk->disk_name, "dm-%d", minor); | |
f26c5719 | 1823 | |
976431b0 | 1824 | if (IS_ENABLED(CONFIG_DAX_DRIVER)) { |
fefc1d97 PG |
1825 | md->dax_dev = alloc_dax(md, md->disk->disk_name, |
1826 | &dm_dax_ops, 0); | |
4e4ced93 | 1827 | if (IS_ERR(md->dax_dev)) |
976431b0 DW |
1828 | goto bad; |
1829 | } | |
f26c5719 | 1830 | |
c100ec49 | 1831 | add_disk_no_queue_reg(md->disk); |
7e51f257 | 1832 | format_dev_t(md->name, MKDEV(_major, minor)); |
1da177e4 | 1833 | |
670368a8 | 1834 | md->wq = alloc_workqueue("kdmflush", WQ_MEM_RECLAIM, 0); |
304f3f6a | 1835 | if (!md->wq) |
0f20972f | 1836 | goto bad; |
304f3f6a | 1837 | |
fd2ed4d2 MP |
1838 | dm_stats_init(&md->stats); |
1839 | ||
ba61fdd1 | 1840 | /* Populate the mapping, nobody knows we exist yet */ |
f32c10b0 | 1841 | spin_lock(&_minor_lock); |
ba61fdd1 | 1842 | old_md = idr_replace(&_minor_idr, md, minor); |
f32c10b0 | 1843 | spin_unlock(&_minor_lock); |
ba61fdd1 JM |
1844 | |
1845 | BUG_ON(old_md != MINOR_ALLOCED); | |
1846 | ||
1da177e4 LT |
1847 | return md; |
1848 | ||
0f20972f MS |
1849 | bad: |
1850 | cleanup_mapped_device(md); | |
83d5e5b0 | 1851 | bad_io_barrier: |
1da177e4 | 1852 | free_minor(minor); |
6ed7ade8 | 1853 | bad_minor: |
10da4f79 | 1854 | module_put(THIS_MODULE); |
6ed7ade8 | 1855 | bad_module_get: |
856eb091 | 1856 | kvfree(md); |
1da177e4 LT |
1857 | return NULL; |
1858 | } | |
1859 | ||
ae9da83f JN |
1860 | static void unlock_fs(struct mapped_device *md); |
1861 | ||
1da177e4 LT |
1862 | static void free_dev(struct mapped_device *md) |
1863 | { | |
f331c029 | 1864 | int minor = MINOR(disk_devt(md->disk)); |
63d94e48 | 1865 | |
32a926da | 1866 | unlock_fs(md); |
2eb6e1e3 | 1867 | |
0f20972f | 1868 | cleanup_mapped_device(md); |
63a4f065 | 1869 | |
86f1152b | 1870 | free_table_devices(&md->table_devices); |
63a4f065 | 1871 | dm_stats_cleanup(&md->stats); |
63a4f065 MS |
1872 | free_minor(minor); |
1873 | ||
10da4f79 | 1874 | module_put(THIS_MODULE); |
856eb091 | 1875 | kvfree(md); |
1da177e4 LT |
1876 | } |
1877 | ||
2a2a4c51 | 1878 | static int __bind_mempools(struct mapped_device *md, struct dm_table *t) |
e6ee8c0b | 1879 | { |
c0820cf5 | 1880 | struct dm_md_mempools *p = dm_table_get_md_mempools(t); |
2a2a4c51 | 1881 | int ret = 0; |
e6ee8c0b | 1882 | |
0776aa0e | 1883 | if (dm_table_bio_based(t)) { |
64f52b0e MS |
1884 | /* |
1885 | * The md may already have mempools that need changing. | |
1886 | * If so, reload bioset because front_pad may have changed | |
1887 | * because a different table was loaded. | |
1888 | */ | |
6f1c819c KO |
1889 | bioset_exit(&md->bs); |
1890 | bioset_exit(&md->io_bs); | |
0776aa0e | 1891 | |
6f1c819c | 1892 | } else if (bioset_initialized(&md->bs)) { |
4e6e36c3 MS |
1893 | /* |
1894 | * There's no need to reload with request-based dm | |
1895 | * because the size of front_pad doesn't change. | |
1896 | * Note for future: If you are to reload bioset, | |
1897 | * prep-ed requests in the queue may refer | |
1898 | * to bio from the old bioset, so you must walk | |
1899 | * through the queue to unprep. | |
1900 | */ | |
1901 | goto out; | |
c0820cf5 | 1902 | } |
e6ee8c0b | 1903 | |
6f1c819c KO |
1904 | BUG_ON(!p || |
1905 | bioset_initialized(&md->bs) || | |
1906 | bioset_initialized(&md->io_bs)); | |
cbc4e3c1 | 1907 | |
2a2a4c51 JA |
1908 | ret = bioset_init_from_src(&md->bs, &p->bs); |
1909 | if (ret) | |
1910 | goto out; | |
1911 | ret = bioset_init_from_src(&md->io_bs, &p->io_bs); | |
1912 | if (ret) | |
1913 | bioset_exit(&md->bs); | |
e6ee8c0b | 1914 | out: |
02233342 | 1915 | /* mempool bind completed, no longer need any mempools in the table */ |
e6ee8c0b | 1916 | dm_table_free_md_mempools(t); |
2a2a4c51 | 1917 | return ret; |
e6ee8c0b KU |
1918 | } |
1919 | ||
1da177e4 LT |
1920 | /* |
1921 | * Bind a table to the device. | |
1922 | */ | |
1923 | static void event_callback(void *context) | |
1924 | { | |
7a8c3d3b MA |
1925 | unsigned long flags; |
1926 | LIST_HEAD(uevents); | |
1da177e4 LT |
1927 | struct mapped_device *md = (struct mapped_device *) context; |
1928 | ||
7a8c3d3b MA |
1929 | spin_lock_irqsave(&md->uevent_lock, flags); |
1930 | list_splice_init(&md->uevent_list, &uevents); | |
1931 | spin_unlock_irqrestore(&md->uevent_lock, flags); | |
1932 | ||
ed9e1982 | 1933 | dm_send_uevents(&uevents, &disk_to_dev(md->disk)->kobj); |
7a8c3d3b | 1934 | |
1da177e4 LT |
1935 | atomic_inc(&md->event_nr); |
1936 | wake_up(&md->eventq); | |
62e08243 | 1937 | dm_issue_global_event(); |
1da177e4 LT |
1938 | } |
1939 | ||
042d2a9b AK |
1940 | /* |
1941 | * Returns old map, which caller must destroy. | |
1942 | */ | |
1943 | static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, | |
1944 | struct queue_limits *limits) | |
1da177e4 | 1945 | { |
042d2a9b | 1946 | struct dm_table *old_map; |
165125e1 | 1947 | struct request_queue *q = md->queue; |
978e51ba | 1948 | bool request_based = dm_table_request_based(t); |
1da177e4 | 1949 | sector_t size; |
2a2a4c51 | 1950 | int ret; |
1da177e4 | 1951 | |
5a8f1f80 BVA |
1952 | lockdep_assert_held(&md->suspend_lock); |
1953 | ||
1da177e4 | 1954 | size = dm_table_get_size(t); |
3ac51e74 DW |
1955 | |
1956 | /* | |
1957 | * Wipe any geometry if the size of the table changed. | |
1958 | */ | |
fd2ed4d2 | 1959 | if (size != dm_get_size(md)) |
3ac51e74 DW |
1960 | memset(&md->geometry, 0, sizeof(md->geometry)); |
1961 | ||
f64d9b2e | 1962 | set_capacity_and_notify(md->disk, size); |
d5816876 | 1963 | |
2ca3310e AK |
1964 | dm_table_event_callback(t, event_callback, md); |
1965 | ||
e6ee8c0b KU |
1966 | /* |
1967 | * The queue hasn't been stopped yet, if the old table type wasn't | |
1968 | * for request-based during suspension. So stop it to prevent | |
1969 | * I/O mapping before resume. | |
1970 | * This must be done before setting the queue restrictions, | |
1971 | * because request-based dm may be run just after the setting. | |
1972 | */ | |
978e51ba | 1973 | if (request_based) |
eca7ee6d | 1974 | dm_stop_queue(q); |
978e51ba | 1975 | |
9c37de29 | 1976 | if (request_based) { |
16f12266 | 1977 | /* |
9c37de29 MS |
1978 | * Leverage the fact that request-based DM targets are |
1979 | * immutable singletons - used to optimize dm_mq_queue_rq. | |
16f12266 MS |
1980 | */ |
1981 | md->immutable_target = dm_table_get_immutable_target(t); | |
1982 | } | |
e6ee8c0b | 1983 | |
2a2a4c51 JA |
1984 | ret = __bind_mempools(md, t); |
1985 | if (ret) { | |
1986 | old_map = ERR_PTR(ret); | |
1987 | goto out; | |
1988 | } | |
e6ee8c0b | 1989 | |
a12f5d48 | 1990 | old_map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
1d3aa6f6 | 1991 | rcu_assign_pointer(md->map, (void *)t); |
36a0456f AK |
1992 | md->immutable_target_type = dm_table_get_immutable_target_type(t); |
1993 | ||
754c5fc7 | 1994 | dm_table_set_restrictions(t, q, limits); |
41abc4e1 HR |
1995 | if (old_map) |
1996 | dm_sync_table(md); | |
1da177e4 | 1997 | |
2a2a4c51 | 1998 | out: |
042d2a9b | 1999 | return old_map; |
1da177e4 LT |
2000 | } |
2001 | ||
a7940155 AK |
2002 | /* |
2003 | * Returns unbound table for the caller to free. | |
2004 | */ | |
2005 | static struct dm_table *__unbind(struct mapped_device *md) | |
1da177e4 | 2006 | { |
a12f5d48 | 2007 | struct dm_table *map = rcu_dereference_protected(md->map, 1); |
1da177e4 LT |
2008 | |
2009 | if (!map) | |
a7940155 | 2010 | return NULL; |
1da177e4 LT |
2011 | |
2012 | dm_table_event_callback(map, NULL, NULL); | |
9cdb8520 | 2013 | RCU_INIT_POINTER(md->map, NULL); |
83d5e5b0 | 2014 | dm_sync_table(md); |
a7940155 AK |
2015 | |
2016 | return map; | |
1da177e4 LT |
2017 | } |
2018 | ||
2019 | /* | |
2020 | * Constructor for a new device. | |
2021 | */ | |
2b06cfff | 2022 | int dm_create(int minor, struct mapped_device **result) |
1da177e4 | 2023 | { |
c12c9a3c | 2024 | int r; |
1da177e4 LT |
2025 | struct mapped_device *md; |
2026 | ||
2b06cfff | 2027 | md = alloc_dev(minor); |
1da177e4 LT |
2028 | if (!md) |
2029 | return -ENXIO; | |
2030 | ||
c12c9a3c MS |
2031 | r = dm_sysfs_init(md); |
2032 | if (r) { | |
2033 | free_dev(md); | |
2034 | return r; | |
2035 | } | |
784aae73 | 2036 | |
1da177e4 LT |
2037 | *result = md; |
2038 | return 0; | |
2039 | } | |
2040 | ||
a5664dad MS |
2041 | /* |
2042 | * Functions to manage md->type. | |
2043 | * All are required to hold md->type_lock. | |
2044 | */ | |
2045 | void dm_lock_md_type(struct mapped_device *md) | |
2046 | { | |
2047 | mutex_lock(&md->type_lock); | |
2048 | } | |
2049 | ||
2050 | void dm_unlock_md_type(struct mapped_device *md) | |
2051 | { | |
2052 | mutex_unlock(&md->type_lock); | |
2053 | } | |
2054 | ||
7e0d574f | 2055 | void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type) |
a5664dad | 2056 | { |
00c4fc3b | 2057 | BUG_ON(!mutex_is_locked(&md->type_lock)); |
a5664dad MS |
2058 | md->type = type; |
2059 | } | |
2060 | ||
7e0d574f | 2061 | enum dm_queue_mode dm_get_md_type(struct mapped_device *md) |
a5664dad MS |
2062 | { |
2063 | return md->type; | |
2064 | } | |
2065 | ||
36a0456f AK |
2066 | struct target_type *dm_get_immutable_target_type(struct mapped_device *md) |
2067 | { | |
2068 | return md->immutable_target_type; | |
2069 | } | |
2070 | ||
f84cb8a4 MS |
2071 | /* |
2072 | * The queue_limits are only valid as long as you have a reference | |
2073 | * count on 'md'. | |
2074 | */ | |
2075 | struct queue_limits *dm_get_queue_limits(struct mapped_device *md) | |
2076 | { | |
2077 | BUG_ON(!atomic_read(&md->holders)); | |
2078 | return &md->queue->limits; | |
2079 | } | |
2080 | EXPORT_SYMBOL_GPL(dm_get_queue_limits); | |
2081 | ||
4a0b4ddf MS |
2082 | /* |
2083 | * Setup the DM device's queue based on md's type | |
2084 | */ | |
591ddcfc | 2085 | int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t) |
4a0b4ddf | 2086 | { |
bfebd1cd | 2087 | int r; |
c100ec49 | 2088 | struct queue_limits limits; |
7e0d574f | 2089 | enum dm_queue_mode type = dm_get_md_type(md); |
bfebd1cd | 2090 | |
545ed20e | 2091 | switch (type) { |
bfebd1cd | 2092 | case DM_TYPE_REQUEST_BASED: |
681cc5e8 | 2093 | md->disk->fops = &dm_rq_blk_dops; |
e83068a5 | 2094 | r = dm_mq_init_request_queue(md, t); |
bfebd1cd | 2095 | if (r) { |
681cc5e8 | 2096 | DMERR("Cannot initialize queue for request-based dm mapped device"); |
bfebd1cd MS |
2097 | return r; |
2098 | } | |
2099 | break; | |
2100 | case DM_TYPE_BIO_BASED: | |
545ed20e | 2101 | case DM_TYPE_DAX_BIO_BASED: |
bfebd1cd | 2102 | break; |
7e0d574f BVA |
2103 | case DM_TYPE_NONE: |
2104 | WARN_ON_ONCE(true); | |
2105 | break; | |
4a0b4ddf MS |
2106 | } |
2107 | ||
c100ec49 MS |
2108 | r = dm_calculate_queue_limits(t, &limits); |
2109 | if (r) { | |
2110 | DMERR("Cannot calculate initial queue limits"); | |
2111 | return r; | |
2112 | } | |
2113 | dm_table_set_restrictions(t, md->queue, &limits); | |
2114 | blk_register_queue(md->disk); | |
2115 | ||
4a0b4ddf MS |
2116 | return 0; |
2117 | } | |
2118 | ||
2bec1f4a | 2119 | struct mapped_device *dm_get_md(dev_t dev) |
1da177e4 LT |
2120 | { |
2121 | struct mapped_device *md; | |
1da177e4 LT |
2122 | unsigned minor = MINOR(dev); |
2123 | ||
2124 | if (MAJOR(dev) != _major || minor >= (1 << MINORBITS)) | |
2125 | return NULL; | |
2126 | ||
f32c10b0 | 2127 | spin_lock(&_minor_lock); |
1da177e4 LT |
2128 | |
2129 | md = idr_find(&_minor_idr, minor); | |
49de5769 MS |
2130 | if (!md || md == MINOR_ALLOCED || (MINOR(disk_devt(dm_disk(md))) != minor) || |
2131 | test_bit(DMF_FREEING, &md->flags) || dm_deleting_md(md)) { | |
2132 | md = NULL; | |
2133 | goto out; | |
fba9f90e | 2134 | } |
49de5769 | 2135 | dm_get(md); |
fba9f90e | 2136 | out: |
f32c10b0 | 2137 | spin_unlock(&_minor_lock); |
1da177e4 | 2138 | |
637842cf DT |
2139 | return md; |
2140 | } | |
3cf2e4ba | 2141 | EXPORT_SYMBOL_GPL(dm_get_md); |
d229a958 | 2142 | |
9ade92a9 | 2143 | void *dm_get_mdptr(struct mapped_device *md) |
637842cf | 2144 | { |
9ade92a9 | 2145 | return md->interface_ptr; |
1da177e4 LT |
2146 | } |
2147 | ||
2148 | void dm_set_mdptr(struct mapped_device *md, void *ptr) | |
2149 | { | |
2150 | md->interface_ptr = ptr; | |
2151 | } | |
2152 | ||
2153 | void dm_get(struct mapped_device *md) | |
2154 | { | |
2155 | atomic_inc(&md->holders); | |
3f77316d | 2156 | BUG_ON(test_bit(DMF_FREEING, &md->flags)); |
1da177e4 LT |
2157 | } |
2158 | ||
09ee96b2 MP |
2159 | int dm_hold(struct mapped_device *md) |
2160 | { | |
2161 | spin_lock(&_minor_lock); | |
2162 | if (test_bit(DMF_FREEING, &md->flags)) { | |
2163 | spin_unlock(&_minor_lock); | |
2164 | return -EBUSY; | |
2165 | } | |
2166 | dm_get(md); | |
2167 | spin_unlock(&_minor_lock); | |
2168 | return 0; | |
2169 | } | |
2170 | EXPORT_SYMBOL_GPL(dm_hold); | |
2171 | ||
72d94861 AK |
2172 | const char *dm_device_name(struct mapped_device *md) |
2173 | { | |
2174 | return md->name; | |
2175 | } | |
2176 | EXPORT_SYMBOL_GPL(dm_device_name); | |
2177 | ||
3f77316d | 2178 | static void __dm_destroy(struct mapped_device *md, bool wait) |
1da177e4 | 2179 | { |
1134e5ae | 2180 | struct dm_table *map; |
83d5e5b0 | 2181 | int srcu_idx; |
1da177e4 | 2182 | |
3f77316d | 2183 | might_sleep(); |
fba9f90e | 2184 | |
63a4f065 | 2185 | spin_lock(&_minor_lock); |
3f77316d KU |
2186 | idr_replace(&_minor_idr, MINOR_ALLOCED, MINOR(disk_devt(dm_disk(md)))); |
2187 | set_bit(DMF_FREEING, &md->flags); | |
2188 | spin_unlock(&_minor_lock); | |
3b785fbc | 2189 | |
c12c9a3c | 2190 | blk_set_queue_dying(md->queue); |
3f77316d | 2191 | |
ab7c7bb6 MP |
2192 | /* |
2193 | * Take suspend_lock so that presuspend and postsuspend methods | |
2194 | * do not race with internal suspend. | |
2195 | */ | |
2196 | mutex_lock(&md->suspend_lock); | |
2a708cff | 2197 | map = dm_get_live_table(md, &srcu_idx); |
3f77316d KU |
2198 | if (!dm_suspended_md(md)) { |
2199 | dm_table_presuspend_targets(map); | |
adc0daad | 2200 | set_bit(DMF_SUSPENDED, &md->flags); |
5df96f2b | 2201 | set_bit(DMF_POST_SUSPENDING, &md->flags); |
3f77316d | 2202 | dm_table_postsuspend_targets(map); |
1da177e4 | 2203 | } |
83d5e5b0 MP |
2204 | /* dm_put_live_table must be before msleep, otherwise deadlock is possible */ |
2205 | dm_put_live_table(md, srcu_idx); | |
2a708cff | 2206 | mutex_unlock(&md->suspend_lock); |
83d5e5b0 | 2207 | |
3f77316d KU |
2208 | /* |
2209 | * Rare, but there may be I/O requests still going to complete, | |
2210 | * for example. Wait for all references to disappear. | |
2211 | * No one should increment the reference count of the mapped_device, | |
2212 | * after the mapped_device state becomes DMF_FREEING. | |
2213 | */ | |
2214 | if (wait) | |
2215 | while (atomic_read(&md->holders)) | |
2216 | msleep(1); | |
2217 | else if (atomic_read(&md->holders)) | |
2218 | DMWARN("%s: Forcibly removing mapped_device still in use! (%d users)", | |
2219 | dm_device_name(md), atomic_read(&md->holders)); | |
2220 | ||
2221 | dm_sysfs_exit(md); | |
3f77316d KU |
2222 | dm_table_destroy(__unbind(md)); |
2223 | free_dev(md); | |
2224 | } | |
2225 | ||
2226 | void dm_destroy(struct mapped_device *md) | |
2227 | { | |
2228 | __dm_destroy(md, true); | |
2229 | } | |
2230 | ||
2231 | void dm_destroy_immediate(struct mapped_device *md) | |
2232 | { | |
2233 | __dm_destroy(md, false); | |
2234 | } | |
2235 | ||
2236 | void dm_put(struct mapped_device *md) | |
2237 | { | |
2238 | atomic_dec(&md->holders); | |
1da177e4 | 2239 | } |
79eb885c | 2240 | EXPORT_SYMBOL_GPL(dm_put); |
1da177e4 | 2241 | |
85067747 ML |
2242 | static bool md_in_flight_bios(struct mapped_device *md) |
2243 | { | |
2244 | int cpu; | |
8446fe92 | 2245 | struct block_device *part = dm_disk(md)->part0; |
85067747 ML |
2246 | long sum = 0; |
2247 | ||
2248 | for_each_possible_cpu(cpu) { | |
2249 | sum += part_stat_local_read_cpu(part, in_flight[0], cpu); | |
2250 | sum += part_stat_local_read_cpu(part, in_flight[1], cpu); | |
2251 | } | |
2252 | ||
2253 | return sum != 0; | |
2254 | } | |
2255 | ||
2256 | static int dm_wait_for_bios_completion(struct mapped_device *md, long task_state) | |
46125c1c MB |
2257 | { |
2258 | int r = 0; | |
9f4c3f87 | 2259 | DEFINE_WAIT(wait); |
46125c1c | 2260 | |
85067747 | 2261 | while (true) { |
9f4c3f87 | 2262 | prepare_to_wait(&md->wait, &wait, task_state); |
46125c1c | 2263 | |
85067747 | 2264 | if (!md_in_flight_bios(md)) |
46125c1c MB |
2265 | break; |
2266 | ||
e3fabdfd | 2267 | if (signal_pending_state(task_state, current)) { |
46125c1c MB |
2268 | r = -EINTR; |
2269 | break; | |
2270 | } | |
2271 | ||
2272 | io_schedule(); | |
2273 | } | |
9f4c3f87 | 2274 | finish_wait(&md->wait, &wait); |
b44ebeb0 | 2275 | |
46125c1c MB |
2276 | return r; |
2277 | } | |
2278 | ||
85067747 ML |
2279 | static int dm_wait_for_completion(struct mapped_device *md, long task_state) |
2280 | { | |
2281 | int r = 0; | |
2282 | ||
2283 | if (!queue_is_mq(md->queue)) | |
2284 | return dm_wait_for_bios_completion(md, task_state); | |
2285 | ||
2286 | while (true) { | |
2287 | if (!blk_mq_queue_inflight(md->queue)) | |
2288 | break; | |
2289 | ||
2290 | if (signal_pending_state(task_state, current)) { | |
2291 | r = -EINTR; | |
2292 | break; | |
2293 | } | |
2294 | ||
2295 | msleep(5); | |
2296 | } | |
2297 | ||
2298 | return r; | |
2299 | } | |
2300 | ||
1da177e4 LT |
2301 | /* |
2302 | * Process the deferred bios | |
2303 | */ | |
ef208587 | 2304 | static void dm_wq_work(struct work_struct *work) |
1da177e4 | 2305 | { |
0c2915b8 MS |
2306 | struct mapped_device *md = container_of(work, struct mapped_device, work); |
2307 | struct bio *bio; | |
ef208587 | 2308 | |
3b00b203 | 2309 | while (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) { |
df12ee99 | 2310 | spin_lock_irq(&md->deferred_lock); |
0c2915b8 | 2311 | bio = bio_list_pop(&md->deferred); |
df12ee99 AK |
2312 | spin_unlock_irq(&md->deferred_lock); |
2313 | ||
0c2915b8 | 2314 | if (!bio) |
df12ee99 | 2315 | break; |
022c2611 | 2316 | |
0c2915b8 | 2317 | submit_bio_noacct(bio); |
022c2611 | 2318 | } |
1da177e4 LT |
2319 | } |
2320 | ||
9a1fb464 | 2321 | static void dm_queue_flush(struct mapped_device *md) |
304f3f6a | 2322 | { |
3b00b203 | 2323 | clear_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
4e857c58 | 2324 | smp_mb__after_atomic(); |
53d5914f | 2325 | queue_work(md->wq, &md->work); |
304f3f6a MB |
2326 | } |
2327 | ||
1da177e4 | 2328 | /* |
042d2a9b | 2329 | * Swap in a new table, returning the old one for the caller to destroy. |
1da177e4 | 2330 | */ |
042d2a9b | 2331 | struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table) |
1da177e4 | 2332 | { |
87eb5b21 | 2333 | struct dm_table *live_map = NULL, *map = ERR_PTR(-EINVAL); |
754c5fc7 | 2334 | struct queue_limits limits; |
042d2a9b | 2335 | int r; |
1da177e4 | 2336 | |
e61290a4 | 2337 | mutex_lock(&md->suspend_lock); |
1da177e4 LT |
2338 | |
2339 | /* device must be suspended */ | |
4f186f8b | 2340 | if (!dm_suspended_md(md)) |
93c534ae | 2341 | goto out; |
1da177e4 | 2342 | |
3ae70656 MS |
2343 | /* |
2344 | * If the new table has no data devices, retain the existing limits. | |
2345 | * This helps multipath with queue_if_no_path if all paths disappear, | |
2346 | * then new I/O is queued based on these limits, and then some paths | |
2347 | * reappear. | |
2348 | */ | |
2349 | if (dm_table_has_no_data_devices(table)) { | |
83d5e5b0 | 2350 | live_map = dm_get_live_table_fast(md); |
3ae70656 MS |
2351 | if (live_map) |
2352 | limits = md->queue->limits; | |
83d5e5b0 | 2353 | dm_put_live_table_fast(md); |
3ae70656 MS |
2354 | } |
2355 | ||
87eb5b21 MC |
2356 | if (!live_map) { |
2357 | r = dm_calculate_queue_limits(table, &limits); | |
2358 | if (r) { | |
2359 | map = ERR_PTR(r); | |
2360 | goto out; | |
2361 | } | |
042d2a9b | 2362 | } |
754c5fc7 | 2363 | |
042d2a9b | 2364 | map = __bind(md, table, &limits); |
62e08243 | 2365 | dm_issue_global_event(); |
1da177e4 | 2366 | |
93c534ae | 2367 | out: |
e61290a4 | 2368 | mutex_unlock(&md->suspend_lock); |
042d2a9b | 2369 | return map; |
1da177e4 LT |
2370 | } |
2371 | ||
2372 | /* | |
2373 | * Functions to lock and unlock any filesystem running on the | |
2374 | * device. | |
2375 | */ | |
2ca3310e | 2376 | static int lock_fs(struct mapped_device *md) |
1da177e4 | 2377 | { |
e39e2e95 | 2378 | int r; |
1da177e4 | 2379 | |
040f04bd | 2380 | WARN_ON(test_bit(DMF_FROZEN, &md->flags)); |
aa8d7c2f | 2381 | |
977115c0 | 2382 | r = freeze_bdev(md->disk->part0); |
040f04bd CH |
2383 | if (!r) |
2384 | set_bit(DMF_FROZEN, &md->flags); | |
2385 | return r; | |
1da177e4 LT |
2386 | } |
2387 | ||
2ca3310e | 2388 | static void unlock_fs(struct mapped_device *md) |
1da177e4 | 2389 | { |
aa8d7c2f AK |
2390 | if (!test_bit(DMF_FROZEN, &md->flags)) |
2391 | return; | |
977115c0 | 2392 | thaw_bdev(md->disk->part0); |
aa8d7c2f | 2393 | clear_bit(DMF_FROZEN, &md->flags); |
1da177e4 LT |
2394 | } |
2395 | ||
2396 | /* | |
b48633f8 BVA |
2397 | * @suspend_flags: DM_SUSPEND_LOCKFS_FLAG and/or DM_SUSPEND_NOFLUSH_FLAG |
2398 | * @task_state: e.g. TASK_INTERRUPTIBLE or TASK_UNINTERRUPTIBLE | |
2399 | * @dmf_suspended_flag: DMF_SUSPENDED or DMF_SUSPENDED_INTERNALLY | |
2400 | * | |
ffcc3936 MS |
2401 | * If __dm_suspend returns 0, the device is completely quiescent |
2402 | * now. There is no request-processing activity. All new requests | |
2403 | * are being added to md->deferred list. | |
cec47e3d | 2404 | */ |
ffcc3936 | 2405 | static int __dm_suspend(struct mapped_device *md, struct dm_table *map, |
b48633f8 | 2406 | unsigned suspend_flags, long task_state, |
eaf9a736 | 2407 | int dmf_suspended_flag) |
1da177e4 | 2408 | { |
ffcc3936 MS |
2409 | bool do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG; |
2410 | bool noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG; | |
2411 | int r; | |
1da177e4 | 2412 | |
5a8f1f80 BVA |
2413 | lockdep_assert_held(&md->suspend_lock); |
2414 | ||
2e93ccc1 KU |
2415 | /* |
2416 | * DMF_NOFLUSH_SUSPENDING must be set before presuspend. | |
2417 | * This flag is cleared before dm_suspend returns. | |
2418 | */ | |
2419 | if (noflush) | |
2420 | set_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); | |
86331f39 | 2421 | else |
ac75b09f | 2422 | DMDEBUG("%s: suspending with flush", dm_device_name(md)); |
2e93ccc1 | 2423 | |
d67ee213 MS |
2424 | /* |
2425 | * This gets reverted if there's an error later and the targets | |
2426 | * provide the .presuspend_undo hook. | |
2427 | */ | |
cf222b37 AK |
2428 | dm_table_presuspend_targets(map); |
2429 | ||
32a926da | 2430 | /* |
9f518b27 KU |
2431 | * Flush I/O to the device. |
2432 | * Any I/O submitted after lock_fs() may not be flushed. | |
2433 | * noflush takes precedence over do_lockfs. | |
2434 | * (lock_fs() flushes I/Os and waits for them to complete.) | |
32a926da MP |
2435 | */ |
2436 | if (!noflush && do_lockfs) { | |
2437 | r = lock_fs(md); | |
d67ee213 MS |
2438 | if (r) { |
2439 | dm_table_presuspend_undo_targets(map); | |
ffcc3936 | 2440 | return r; |
d67ee213 | 2441 | } |
aa8d7c2f | 2442 | } |
1da177e4 LT |
2443 | |
2444 | /* | |
3b00b203 MP |
2445 | * Here we must make sure that no processes are submitting requests |
2446 | * to target drivers i.e. no one may be executing | |
0cede372 | 2447 | * __split_and_process_bio from dm_submit_bio. |
3b00b203 | 2448 | * |
0cede372 | 2449 | * To get all processes out of __split_and_process_bio in dm_submit_bio, |
3b00b203 | 2450 | * we take the write lock. To prevent any process from reentering |
0cede372 MS |
2451 | * __split_and_process_bio from dm_submit_bio and quiesce the thread |
2452 | * (dm_wq_work), we set DMF_BLOCK_IO_FOR_SUSPEND and call | |
6a8736d1 | 2453 | * flush_workqueue(md->wq). |
1da177e4 | 2454 | */ |
1eb787ec | 2455 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
41abc4e1 HR |
2456 | if (map) |
2457 | synchronize_srcu(&md->io_barrier); | |
1da177e4 | 2458 | |
d0bcb878 | 2459 | /* |
29e4013d TH |
2460 | * Stop md->queue before flushing md->wq in case request-based |
2461 | * dm defers requests to md->wq from md->queue. | |
d0bcb878 | 2462 | */ |
6a23e05c | 2463 | if (dm_request_based(md)) |
eca7ee6d | 2464 | dm_stop_queue(md->queue); |
cec47e3d | 2465 | |
d0bcb878 KU |
2466 | flush_workqueue(md->wq); |
2467 | ||
1da177e4 | 2468 | /* |
3b00b203 MP |
2469 | * At this point no more requests are entering target request routines. |
2470 | * We call dm_wait_for_completion to wait for all existing requests | |
2471 | * to finish. | |
1da177e4 | 2472 | */ |
b48633f8 | 2473 | r = dm_wait_for_completion(md, task_state); |
eaf9a736 MS |
2474 | if (!r) |
2475 | set_bit(dmf_suspended_flag, &md->flags); | |
1da177e4 | 2476 | |
6d6f10df | 2477 | if (noflush) |
022c2611 | 2478 | clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); |
41abc4e1 HR |
2479 | if (map) |
2480 | synchronize_srcu(&md->io_barrier); | |
2e93ccc1 | 2481 | |
1da177e4 | 2482 | /* were we interrupted ? */ |
46125c1c | 2483 | if (r < 0) { |
9a1fb464 | 2484 | dm_queue_flush(md); |
73d410c0 | 2485 | |
cec47e3d | 2486 | if (dm_request_based(md)) |
eca7ee6d | 2487 | dm_start_queue(md->queue); |
cec47e3d | 2488 | |
2ca3310e | 2489 | unlock_fs(md); |
d67ee213 | 2490 | dm_table_presuspend_undo_targets(map); |
ffcc3936 | 2491 | /* pushback list is already flushed, so skip flush */ |
2ca3310e | 2492 | } |
1da177e4 | 2493 | |
ffcc3936 MS |
2494 | return r; |
2495 | } | |
2496 | ||
2497 | /* | |
2498 | * We need to be able to change a mapping table under a mounted | |
2499 | * filesystem. For example we might want to move some data in | |
2500 | * the background. Before the table can be swapped with | |
2501 | * dm_bind_table, dm_suspend must be called to flush any in | |
2502 | * flight bios and ensure that any further io gets deferred. | |
2503 | */ | |
2504 | /* | |
2505 | * Suspend mechanism in request-based dm. | |
2506 | * | |
2507 | * 1. Flush all I/Os by lock_fs() if needed. | |
2508 | * 2. Stop dispatching any I/O by stopping the request_queue. | |
2509 | * 3. Wait for all in-flight I/Os to be completed or requeued. | |
2510 | * | |
2511 | * To abort suspend, start the request_queue. | |
2512 | */ | |
2513 | int dm_suspend(struct mapped_device *md, unsigned suspend_flags) | |
2514 | { | |
2515 | struct dm_table *map = NULL; | |
2516 | int r = 0; | |
2517 | ||
2518 | retry: | |
2519 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); | |
2520 | ||
2521 | if (dm_suspended_md(md)) { | |
2522 | r = -EINVAL; | |
2523 | goto out_unlock; | |
2524 | } | |
2525 | ||
2526 | if (dm_suspended_internally_md(md)) { | |
2527 | /* already internally suspended, wait for internal resume */ | |
2528 | mutex_unlock(&md->suspend_lock); | |
2529 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); | |
2530 | if (r) | |
2531 | return r; | |
2532 | goto retry; | |
2533 | } | |
2534 | ||
a12f5d48 | 2535 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
ffcc3936 | 2536 | |
eaf9a736 | 2537 | r = __dm_suspend(md, map, suspend_flags, TASK_INTERRUPTIBLE, DMF_SUSPENDED); |
ffcc3936 MS |
2538 | if (r) |
2539 | goto out_unlock; | |
3b00b203 | 2540 | |
5df96f2b | 2541 | set_bit(DMF_POST_SUSPENDING, &md->flags); |
4d4471cb | 2542 | dm_table_postsuspend_targets(map); |
5df96f2b | 2543 | clear_bit(DMF_POST_SUSPENDING, &md->flags); |
4d4471cb | 2544 | |
d287483d | 2545 | out_unlock: |
e61290a4 | 2546 | mutex_unlock(&md->suspend_lock); |
cf222b37 | 2547 | return r; |
1da177e4 LT |
2548 | } |
2549 | ||
ffcc3936 MS |
2550 | static int __dm_resume(struct mapped_device *md, struct dm_table *map) |
2551 | { | |
2552 | if (map) { | |
2553 | int r = dm_table_resume_targets(map); | |
2554 | if (r) | |
2555 | return r; | |
2556 | } | |
2557 | ||
2558 | dm_queue_flush(md); | |
2559 | ||
2560 | /* | |
2561 | * Flushing deferred I/Os must be done after targets are resumed | |
2562 | * so that mapping of targets can work correctly. | |
2563 | * Request-based dm is queueing the deferred I/Os in its request_queue. | |
2564 | */ | |
2565 | if (dm_request_based(md)) | |
eca7ee6d | 2566 | dm_start_queue(md->queue); |
ffcc3936 MS |
2567 | |
2568 | unlock_fs(md); | |
2569 | ||
2570 | return 0; | |
2571 | } | |
2572 | ||
1da177e4 LT |
2573 | int dm_resume(struct mapped_device *md) |
2574 | { | |
8dc23658 | 2575 | int r; |
cf222b37 | 2576 | struct dm_table *map = NULL; |
1da177e4 | 2577 | |
ffcc3936 | 2578 | retry: |
8dc23658 | 2579 | r = -EINVAL; |
ffcc3936 MS |
2580 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); |
2581 | ||
4f186f8b | 2582 | if (!dm_suspended_md(md)) |
cf222b37 | 2583 | goto out; |
cf222b37 | 2584 | |
ffcc3936 MS |
2585 | if (dm_suspended_internally_md(md)) { |
2586 | /* already internally suspended, wait for internal resume */ | |
2587 | mutex_unlock(&md->suspend_lock); | |
2588 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); | |
2589 | if (r) | |
2590 | return r; | |
2591 | goto retry; | |
2592 | } | |
2593 | ||
a12f5d48 | 2594 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
2ca3310e | 2595 | if (!map || !dm_table_get_size(map)) |
cf222b37 | 2596 | goto out; |
1da177e4 | 2597 | |
ffcc3936 | 2598 | r = __dm_resume(md, map); |
8757b776 MB |
2599 | if (r) |
2600 | goto out; | |
2ca3310e | 2601 | |
2ca3310e | 2602 | clear_bit(DMF_SUSPENDED, &md->flags); |
cf222b37 | 2603 | out: |
e61290a4 | 2604 | mutex_unlock(&md->suspend_lock); |
2ca3310e | 2605 | |
cf222b37 | 2606 | return r; |
1da177e4 LT |
2607 | } |
2608 | ||
fd2ed4d2 MP |
2609 | /* |
2610 | * Internal suspend/resume works like userspace-driven suspend. It waits | |
2611 | * until all bios finish and prevents issuing new bios to the target drivers. | |
2612 | * It may be used only from the kernel. | |
fd2ed4d2 MP |
2613 | */ |
2614 | ||
ffcc3936 | 2615 | static void __dm_internal_suspend(struct mapped_device *md, unsigned suspend_flags) |
fd2ed4d2 | 2616 | { |
ffcc3936 MS |
2617 | struct dm_table *map = NULL; |
2618 | ||
1ea0654e BVA |
2619 | lockdep_assert_held(&md->suspend_lock); |
2620 | ||
96b26c8c | 2621 | if (md->internal_suspend_count++) |
ffcc3936 MS |
2622 | return; /* nested internal suspend */ |
2623 | ||
2624 | if (dm_suspended_md(md)) { | |
2625 | set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2626 | return; /* nest suspend */ | |
2627 | } | |
2628 | ||
a12f5d48 | 2629 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
ffcc3936 MS |
2630 | |
2631 | /* | |
2632 | * Using TASK_UNINTERRUPTIBLE because only NOFLUSH internal suspend is | |
2633 | * supported. Properly supporting a TASK_INTERRUPTIBLE internal suspend | |
2634 | * would require changing .presuspend to return an error -- avoid this | |
2635 | * until there is a need for more elaborate variants of internal suspend. | |
2636 | */ | |
eaf9a736 MS |
2637 | (void) __dm_suspend(md, map, suspend_flags, TASK_UNINTERRUPTIBLE, |
2638 | DMF_SUSPENDED_INTERNALLY); | |
ffcc3936 | 2639 | |
5df96f2b | 2640 | set_bit(DMF_POST_SUSPENDING, &md->flags); |
ffcc3936 | 2641 | dm_table_postsuspend_targets(map); |
5df96f2b | 2642 | clear_bit(DMF_POST_SUSPENDING, &md->flags); |
ffcc3936 MS |
2643 | } |
2644 | ||
2645 | static void __dm_internal_resume(struct mapped_device *md) | |
2646 | { | |
96b26c8c MP |
2647 | BUG_ON(!md->internal_suspend_count); |
2648 | ||
2649 | if (--md->internal_suspend_count) | |
ffcc3936 MS |
2650 | return; /* resume from nested internal suspend */ |
2651 | ||
fd2ed4d2 | 2652 | if (dm_suspended_md(md)) |
ffcc3936 MS |
2653 | goto done; /* resume from nested suspend */ |
2654 | ||
2655 | /* | |
2656 | * NOTE: existing callers don't need to call dm_table_resume_targets | |
2657 | * (which may fail -- so best to avoid it for now by passing NULL map) | |
2658 | */ | |
2659 | (void) __dm_resume(md, NULL); | |
2660 | ||
2661 | done: | |
2662 | clear_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2663 | smp_mb__after_atomic(); | |
2664 | wake_up_bit(&md->flags, DMF_SUSPENDED_INTERNALLY); | |
2665 | } | |
2666 | ||
2667 | void dm_internal_suspend_noflush(struct mapped_device *md) | |
2668 | { | |
2669 | mutex_lock(&md->suspend_lock); | |
2670 | __dm_internal_suspend(md, DM_SUSPEND_NOFLUSH_FLAG); | |
2671 | mutex_unlock(&md->suspend_lock); | |
2672 | } | |
2673 | EXPORT_SYMBOL_GPL(dm_internal_suspend_noflush); | |
2674 | ||
2675 | void dm_internal_resume(struct mapped_device *md) | |
2676 | { | |
2677 | mutex_lock(&md->suspend_lock); | |
2678 | __dm_internal_resume(md); | |
2679 | mutex_unlock(&md->suspend_lock); | |
2680 | } | |
2681 | EXPORT_SYMBOL_GPL(dm_internal_resume); | |
2682 | ||
2683 | /* | |
2684 | * Fast variants of internal suspend/resume hold md->suspend_lock, | |
2685 | * which prevents interaction with userspace-driven suspend. | |
2686 | */ | |
2687 | ||
2688 | void dm_internal_suspend_fast(struct mapped_device *md) | |
2689 | { | |
2690 | mutex_lock(&md->suspend_lock); | |
2691 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) | |
fd2ed4d2 MP |
2692 | return; |
2693 | ||
2694 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); | |
2695 | synchronize_srcu(&md->io_barrier); | |
2696 | flush_workqueue(md->wq); | |
2697 | dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE); | |
2698 | } | |
b735fede | 2699 | EXPORT_SYMBOL_GPL(dm_internal_suspend_fast); |
fd2ed4d2 | 2700 | |
ffcc3936 | 2701 | void dm_internal_resume_fast(struct mapped_device *md) |
fd2ed4d2 | 2702 | { |
ffcc3936 | 2703 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) |
fd2ed4d2 MP |
2704 | goto done; |
2705 | ||
2706 | dm_queue_flush(md); | |
2707 | ||
2708 | done: | |
2709 | mutex_unlock(&md->suspend_lock); | |
2710 | } | |
b735fede | 2711 | EXPORT_SYMBOL_GPL(dm_internal_resume_fast); |
fd2ed4d2 | 2712 | |
1da177e4 LT |
2713 | /*----------------------------------------------------------------- |
2714 | * Event notification. | |
2715 | *---------------------------------------------------------------*/ | |
3abf85b5 | 2716 | int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, |
60935eb2 | 2717 | unsigned cookie) |
69267a30 | 2718 | { |
6958c1c6 MP |
2719 | int r; |
2720 | unsigned noio_flag; | |
60935eb2 MB |
2721 | char udev_cookie[DM_COOKIE_LENGTH]; |
2722 | char *envp[] = { udev_cookie, NULL }; | |
2723 | ||
6958c1c6 MP |
2724 | noio_flag = memalloc_noio_save(); |
2725 | ||
60935eb2 | 2726 | if (!cookie) |
6958c1c6 | 2727 | r = kobject_uevent(&disk_to_dev(md->disk)->kobj, action); |
60935eb2 MB |
2728 | else { |
2729 | snprintf(udev_cookie, DM_COOKIE_LENGTH, "%s=%u", | |
2730 | DM_COOKIE_ENV_VAR_NAME, cookie); | |
6958c1c6 MP |
2731 | r = kobject_uevent_env(&disk_to_dev(md->disk)->kobj, |
2732 | action, envp); | |
60935eb2 | 2733 | } |
6958c1c6 MP |
2734 | |
2735 | memalloc_noio_restore(noio_flag); | |
2736 | ||
2737 | return r; | |
69267a30 AK |
2738 | } |
2739 | ||
7a8c3d3b MA |
2740 | uint32_t dm_next_uevent_seq(struct mapped_device *md) |
2741 | { | |
2742 | return atomic_add_return(1, &md->uevent_seq); | |
2743 | } | |
2744 | ||
1da177e4 LT |
2745 | uint32_t dm_get_event_nr(struct mapped_device *md) |
2746 | { | |
2747 | return atomic_read(&md->event_nr); | |
2748 | } | |
2749 | ||
2750 | int dm_wait_event(struct mapped_device *md, int event_nr) | |
2751 | { | |
2752 | return wait_event_interruptible(md->eventq, | |
2753 | (event_nr != atomic_read(&md->event_nr))); | |
2754 | } | |
2755 | ||
7a8c3d3b MA |
2756 | void dm_uevent_add(struct mapped_device *md, struct list_head *elist) |
2757 | { | |
2758 | unsigned long flags; | |
2759 | ||
2760 | spin_lock_irqsave(&md->uevent_lock, flags); | |
2761 | list_add(elist, &md->uevent_list); | |
2762 | spin_unlock_irqrestore(&md->uevent_lock, flags); | |
2763 | } | |
2764 | ||
1da177e4 LT |
2765 | /* |
2766 | * The gendisk is only valid as long as you have a reference | |
2767 | * count on 'md'. | |
2768 | */ | |
2769 | struct gendisk *dm_disk(struct mapped_device *md) | |
2770 | { | |
2771 | return md->disk; | |
2772 | } | |
65ff5b7d | 2773 | EXPORT_SYMBOL_GPL(dm_disk); |
1da177e4 | 2774 | |
784aae73 MB |
2775 | struct kobject *dm_kobject(struct mapped_device *md) |
2776 | { | |
2995fa78 | 2777 | return &md->kobj_holder.kobj; |
784aae73 MB |
2778 | } |
2779 | ||
784aae73 MB |
2780 | struct mapped_device *dm_get_from_kobject(struct kobject *kobj) |
2781 | { | |
2782 | struct mapped_device *md; | |
2783 | ||
2995fa78 | 2784 | md = container_of(kobj, struct mapped_device, kobj_holder.kobj); |
784aae73 | 2785 | |
b9a41d21 HT |
2786 | spin_lock(&_minor_lock); |
2787 | if (test_bit(DMF_FREEING, &md->flags) || dm_deleting_md(md)) { | |
2788 | md = NULL; | |
2789 | goto out; | |
2790 | } | |
784aae73 | 2791 | dm_get(md); |
b9a41d21 HT |
2792 | out: |
2793 | spin_unlock(&_minor_lock); | |
2794 | ||
784aae73 MB |
2795 | return md; |
2796 | } | |
2797 | ||
4f186f8b | 2798 | int dm_suspended_md(struct mapped_device *md) |
1da177e4 LT |
2799 | { |
2800 | return test_bit(DMF_SUSPENDED, &md->flags); | |
2801 | } | |
2802 | ||
5df96f2b MP |
2803 | static int dm_post_suspending_md(struct mapped_device *md) |
2804 | { | |
2805 | return test_bit(DMF_POST_SUSPENDING, &md->flags); | |
2806 | } | |
2807 | ||
ffcc3936 MS |
2808 | int dm_suspended_internally_md(struct mapped_device *md) |
2809 | { | |
2810 | return test_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2811 | } | |
2812 | ||
2c140a24 MP |
2813 | int dm_test_deferred_remove_flag(struct mapped_device *md) |
2814 | { | |
2815 | return test_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
2816 | } | |
2817 | ||
64dbce58 KU |
2818 | int dm_suspended(struct dm_target *ti) |
2819 | { | |
33bd6f06 | 2820 | return dm_suspended_md(ti->table->md); |
64dbce58 KU |
2821 | } |
2822 | EXPORT_SYMBOL_GPL(dm_suspended); | |
2823 | ||
5df96f2b MP |
2824 | int dm_post_suspending(struct dm_target *ti) |
2825 | { | |
33bd6f06 | 2826 | return dm_post_suspending_md(ti->table->md); |
5df96f2b MP |
2827 | } |
2828 | EXPORT_SYMBOL_GPL(dm_post_suspending); | |
2829 | ||
2e93ccc1 KU |
2830 | int dm_noflush_suspending(struct dm_target *ti) |
2831 | { | |
33bd6f06 | 2832 | return __noflush_suspending(ti->table->md); |
2e93ccc1 KU |
2833 | } |
2834 | EXPORT_SYMBOL_GPL(dm_noflush_suspending); | |
2835 | ||
7e0d574f | 2836 | struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type, |
0776aa0e MS |
2837 | unsigned integrity, unsigned per_io_data_size, |
2838 | unsigned min_pool_size) | |
e6ee8c0b | 2839 | { |
115485e8 | 2840 | struct dm_md_mempools *pools = kzalloc_node(sizeof(*pools), GFP_KERNEL, md->numa_node_id); |
78d8e58a | 2841 | unsigned int pool_size = 0; |
64f52b0e | 2842 | unsigned int front_pad, io_front_pad; |
6f1c819c | 2843 | int ret; |
e6ee8c0b KU |
2844 | |
2845 | if (!pools) | |
4e6e36c3 | 2846 | return NULL; |
e6ee8c0b | 2847 | |
78d8e58a MS |
2848 | switch (type) { |
2849 | case DM_TYPE_BIO_BASED: | |
545ed20e | 2850 | case DM_TYPE_DAX_BIO_BASED: |
0776aa0e | 2851 | pool_size = max(dm_get_reserved_bio_based_ios(), min_pool_size); |
30187e1d | 2852 | front_pad = roundup(per_io_data_size, __alignof__(struct dm_target_io)) + offsetof(struct dm_target_io, clone); |
64f52b0e | 2853 | io_front_pad = roundup(front_pad, __alignof__(struct dm_io)) + offsetof(struct dm_io, tio); |
6f1c819c KO |
2854 | ret = bioset_init(&pools->io_bs, pool_size, io_front_pad, 0); |
2855 | if (ret) | |
64f52b0e | 2856 | goto out; |
6f1c819c | 2857 | if (integrity && bioset_integrity_create(&pools->io_bs, pool_size)) |
eb8db831 | 2858 | goto out; |
78d8e58a MS |
2859 | break; |
2860 | case DM_TYPE_REQUEST_BASED: | |
0776aa0e | 2861 | pool_size = max(dm_get_reserved_rq_based_ios(), min_pool_size); |
78d8e58a | 2862 | front_pad = offsetof(struct dm_rq_clone_bio_info, clone); |
591ddcfc | 2863 | /* per_io_data_size is used for blk-mq pdu at queue allocation */ |
78d8e58a MS |
2864 | break; |
2865 | default: | |
2866 | BUG(); | |
2867 | } | |
2868 | ||
6f1c819c KO |
2869 | ret = bioset_init(&pools->bs, pool_size, front_pad, 0); |
2870 | if (ret) | |
5f015204 | 2871 | goto out; |
e6ee8c0b | 2872 | |
6f1c819c | 2873 | if (integrity && bioset_integrity_create(&pools->bs, pool_size)) |
5f015204 | 2874 | goto out; |
a91a2785 | 2875 | |
e6ee8c0b | 2876 | return pools; |
5f1b670d | 2877 | |
5f1b670d CH |
2878 | out: |
2879 | dm_free_md_mempools(pools); | |
78d8e58a | 2880 | |
4e6e36c3 | 2881 | return NULL; |
e6ee8c0b KU |
2882 | } |
2883 | ||
2884 | void dm_free_md_mempools(struct dm_md_mempools *pools) | |
2885 | { | |
2886 | if (!pools) | |
2887 | return; | |
2888 | ||
6f1c819c KO |
2889 | bioset_exit(&pools->bs); |
2890 | bioset_exit(&pools->io_bs); | |
e6ee8c0b KU |
2891 | |
2892 | kfree(pools); | |
2893 | } | |
2894 | ||
9c72bad1 CH |
2895 | struct dm_pr { |
2896 | u64 old_key; | |
2897 | u64 new_key; | |
2898 | u32 flags; | |
2899 | bool fail_early; | |
2900 | }; | |
2901 | ||
2902 | static int dm_call_pr(struct block_device *bdev, iterate_devices_callout_fn fn, | |
2903 | void *data) | |
71cdb697 CH |
2904 | { |
2905 | struct mapped_device *md = bdev->bd_disk->private_data; | |
9c72bad1 CH |
2906 | struct dm_table *table; |
2907 | struct dm_target *ti; | |
2908 | int ret = -ENOTTY, srcu_idx; | |
71cdb697 | 2909 | |
9c72bad1 CH |
2910 | table = dm_get_live_table(md, &srcu_idx); |
2911 | if (!table || !dm_table_get_size(table)) | |
2912 | goto out; | |
71cdb697 | 2913 | |
9c72bad1 CH |
2914 | /* We only support devices that have a single target */ |
2915 | if (dm_table_get_num_targets(table) != 1) | |
2916 | goto out; | |
2917 | ti = dm_table_get_target(table, 0); | |
71cdb697 | 2918 | |
9c72bad1 CH |
2919 | ret = -EINVAL; |
2920 | if (!ti->type->iterate_devices) | |
2921 | goto out; | |
2922 | ||
2923 | ret = ti->type->iterate_devices(ti, fn, data); | |
2924 | out: | |
2925 | dm_put_live_table(md, srcu_idx); | |
2926 | return ret; | |
2927 | } | |
2928 | ||
2929 | /* | |
2930 | * For register / unregister we need to manually call out to every path. | |
2931 | */ | |
2932 | static int __dm_pr_register(struct dm_target *ti, struct dm_dev *dev, | |
2933 | sector_t start, sector_t len, void *data) | |
2934 | { | |
2935 | struct dm_pr *pr = data; | |
2936 | const struct pr_ops *ops = dev->bdev->bd_disk->fops->pr_ops; | |
2937 | ||
2938 | if (!ops || !ops->pr_register) | |
2939 | return -EOPNOTSUPP; | |
2940 | return ops->pr_register(dev->bdev, pr->old_key, pr->new_key, pr->flags); | |
2941 | } | |
2942 | ||
2943 | static int dm_pr_register(struct block_device *bdev, u64 old_key, u64 new_key, | |
2944 | u32 flags) | |
2945 | { | |
2946 | struct dm_pr pr = { | |
2947 | .old_key = old_key, | |
2948 | .new_key = new_key, | |
2949 | .flags = flags, | |
2950 | .fail_early = true, | |
2951 | }; | |
2952 | int ret; | |
2953 | ||
2954 | ret = dm_call_pr(bdev, __dm_pr_register, &pr); | |
2955 | if (ret && new_key) { | |
2956 | /* unregister all paths if we failed to register any path */ | |
2957 | pr.old_key = new_key; | |
2958 | pr.new_key = 0; | |
2959 | pr.flags = 0; | |
2960 | pr.fail_early = false; | |
2961 | dm_call_pr(bdev, __dm_pr_register, &pr); | |
2962 | } | |
2963 | ||
2964 | return ret; | |
71cdb697 CH |
2965 | } |
2966 | ||
2967 | static int dm_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type, | |
956a4025 | 2968 | u32 flags) |
71cdb697 CH |
2969 | { |
2970 | struct mapped_device *md = bdev->bd_disk->private_data; | |
2971 | const struct pr_ops *ops; | |
971888c4 | 2972 | int r, srcu_idx; |
71cdb697 | 2973 | |
5bd5e8d8 | 2974 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
71cdb697 | 2975 | if (r < 0) |
971888c4 | 2976 | goto out; |
71cdb697 CH |
2977 | |
2978 | ops = bdev->bd_disk->fops->pr_ops; | |
2979 | if (ops && ops->pr_reserve) | |
2980 | r = ops->pr_reserve(bdev, key, type, flags); | |
2981 | else | |
2982 | r = -EOPNOTSUPP; | |
971888c4 MS |
2983 | out: |
2984 | dm_unprepare_ioctl(md, srcu_idx); | |
71cdb697 CH |
2985 | return r; |
2986 | } | |
2987 | ||
2988 | static int dm_pr_release(struct block_device *bdev, u64 key, enum pr_type type) | |
2989 | { | |
2990 | struct mapped_device *md = bdev->bd_disk->private_data; | |
2991 | const struct pr_ops *ops; | |
971888c4 | 2992 | int r, srcu_idx; |
71cdb697 | 2993 | |
5bd5e8d8 | 2994 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
71cdb697 | 2995 | if (r < 0) |
971888c4 | 2996 | goto out; |
71cdb697 CH |
2997 | |
2998 | ops = bdev->bd_disk->fops->pr_ops; | |
2999 | if (ops && ops->pr_release) | |
3000 | r = ops->pr_release(bdev, key, type); | |
3001 | else | |
3002 | r = -EOPNOTSUPP; | |
971888c4 MS |
3003 | out: |
3004 | dm_unprepare_ioctl(md, srcu_idx); | |
71cdb697 CH |
3005 | return r; |
3006 | } | |
3007 | ||
3008 | static int dm_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key, | |
956a4025 | 3009 | enum pr_type type, bool abort) |
71cdb697 CH |
3010 | { |
3011 | struct mapped_device *md = bdev->bd_disk->private_data; | |
3012 | const struct pr_ops *ops; | |
971888c4 | 3013 | int r, srcu_idx; |
71cdb697 | 3014 | |
5bd5e8d8 | 3015 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
71cdb697 | 3016 | if (r < 0) |
971888c4 | 3017 | goto out; |
71cdb697 CH |
3018 | |
3019 | ops = bdev->bd_disk->fops->pr_ops; | |
3020 | if (ops && ops->pr_preempt) | |
3021 | r = ops->pr_preempt(bdev, old_key, new_key, type, abort); | |
3022 | else | |
3023 | r = -EOPNOTSUPP; | |
971888c4 MS |
3024 | out: |
3025 | dm_unprepare_ioctl(md, srcu_idx); | |
71cdb697 CH |
3026 | return r; |
3027 | } | |
3028 | ||
3029 | static int dm_pr_clear(struct block_device *bdev, u64 key) | |
3030 | { | |
3031 | struct mapped_device *md = bdev->bd_disk->private_data; | |
3032 | const struct pr_ops *ops; | |
971888c4 | 3033 | int r, srcu_idx; |
71cdb697 | 3034 | |
5bd5e8d8 | 3035 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
71cdb697 | 3036 | if (r < 0) |
971888c4 | 3037 | goto out; |
71cdb697 CH |
3038 | |
3039 | ops = bdev->bd_disk->fops->pr_ops; | |
3040 | if (ops && ops->pr_clear) | |
3041 | r = ops->pr_clear(bdev, key); | |
3042 | else | |
3043 | r = -EOPNOTSUPP; | |
971888c4 MS |
3044 | out: |
3045 | dm_unprepare_ioctl(md, srcu_idx); | |
71cdb697 CH |
3046 | return r; |
3047 | } | |
3048 | ||
3049 | static const struct pr_ops dm_pr_ops = { | |
3050 | .pr_register = dm_pr_register, | |
3051 | .pr_reserve = dm_pr_reserve, | |
3052 | .pr_release = dm_pr_release, | |
3053 | .pr_preempt = dm_pr_preempt, | |
3054 | .pr_clear = dm_pr_clear, | |
3055 | }; | |
3056 | ||
83d5cde4 | 3057 | static const struct block_device_operations dm_blk_dops = { |
c62b37d9 | 3058 | .submit_bio = dm_submit_bio, |
1da177e4 LT |
3059 | .open = dm_blk_open, |
3060 | .release = dm_blk_close, | |
aa129a22 | 3061 | .ioctl = dm_blk_ioctl, |
3ac51e74 | 3062 | .getgeo = dm_blk_getgeo, |
e76239a3 | 3063 | .report_zones = dm_blk_report_zones, |
71cdb697 | 3064 | .pr_ops = &dm_pr_ops, |
1da177e4 LT |
3065 | .owner = THIS_MODULE |
3066 | }; | |
3067 | ||
681cc5e8 MS |
3068 | static const struct block_device_operations dm_rq_blk_dops = { |
3069 | .open = dm_blk_open, | |
3070 | .release = dm_blk_close, | |
3071 | .ioctl = dm_blk_ioctl, | |
3072 | .getgeo = dm_blk_getgeo, | |
3073 | .pr_ops = &dm_pr_ops, | |
3074 | .owner = THIS_MODULE | |
3075 | }; | |
3076 | ||
f26c5719 DW |
3077 | static const struct dax_operations dm_dax_ops = { |
3078 | .direct_access = dm_dax_direct_access, | |
7bf7eac8 | 3079 | .dax_supported = dm_dax_supported, |
7e026c8c | 3080 | .copy_from_iter = dm_dax_copy_from_iter, |
b3a9a0c3 | 3081 | .copy_to_iter = dm_dax_copy_to_iter, |
cdf6cdcd | 3082 | .zero_page_range = dm_dax_zero_page_range, |
f26c5719 DW |
3083 | }; |
3084 | ||
1da177e4 LT |
3085 | /* |
3086 | * module hooks | |
3087 | */ | |
3088 | module_init(dm_init); | |
3089 | module_exit(dm_exit); | |
3090 | ||
3091 | module_param(major, uint, 0); | |
3092 | MODULE_PARM_DESC(major, "The major number of the device mapper"); | |
f4790826 | 3093 | |
e8603136 MS |
3094 | module_param(reserved_bio_based_ios, uint, S_IRUGO | S_IWUSR); |
3095 | MODULE_PARM_DESC(reserved_bio_based_ios, "Reserved IOs in bio-based mempools"); | |
3096 | ||
115485e8 MS |
3097 | module_param(dm_numa_node, int, S_IRUGO | S_IWUSR); |
3098 | MODULE_PARM_DESC(dm_numa_node, "NUMA node for DM device memory allocations"); | |
3099 | ||
1da177e4 LT |
3100 | MODULE_DESCRIPTION(DM_NAME " driver"); |
3101 | MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>"); | |
3102 | MODULE_LICENSE("GPL"); |