Commit | Line | Data |
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3bd94003 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * Copyright (C) 2001, 2002 Sistina Software (UK) Limited. | |
784aae73 | 4 | * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
1da177e4 LT |
5 | * |
6 | * This file is released under the GPL. | |
7 | */ | |
8 | ||
4cc96131 MS |
9 | #include "dm-core.h" |
10 | #include "dm-rq.h" | |
51e5b2bd | 11 | #include "dm-uevent.h" |
91ccbbac | 12 | #include "dm-ima.h" |
1da177e4 LT |
13 | |
14 | #include <linux/init.h> | |
15 | #include <linux/module.h> | |
48c9c27b | 16 | #include <linux/mutex.h> |
6958c1c6 | 17 | #include <linux/sched/mm.h> |
174cd4b1 | 18 | #include <linux/sched/signal.h> |
1da177e4 LT |
19 | #include <linux/blkpg.h> |
20 | #include <linux/bio.h> | |
1da177e4 | 21 | #include <linux/mempool.h> |
f26c5719 | 22 | #include <linux/dax.h> |
1da177e4 LT |
23 | #include <linux/slab.h> |
24 | #include <linux/idr.h> | |
7e026c8c | 25 | #include <linux/uio.h> |
3ac51e74 | 26 | #include <linux/hdreg.h> |
3f77316d | 27 | #include <linux/delay.h> |
ffcc3936 | 28 | #include <linux/wait.h> |
71cdb697 | 29 | #include <linux/pr.h> |
b0b4d7c6 | 30 | #include <linux/refcount.h> |
c6a564ff | 31 | #include <linux/part_stat.h> |
a892c8d5 | 32 | #include <linux/blk-crypto.h> |
1e8d44bd | 33 | #include <linux/blk-crypto-profile.h> |
55782138 | 34 | |
72d94861 AK |
35 | #define DM_MSG_PREFIX "core" |
36 | ||
60935eb2 MB |
37 | /* |
38 | * Cookies are numeric values sent with CHANGE and REMOVE | |
39 | * uevents while resuming, removing or renaming the device. | |
40 | */ | |
41 | #define DM_COOKIE_ENV_VAR_NAME "DM_COOKIE" | |
42 | #define DM_COOKIE_LENGTH 24 | |
43 | ||
b99fdcdc ML |
44 | /* |
45 | * For REQ_POLLED fs bio, this flag is set if we link mapped underlying | |
46 | * dm_io into one list, and reuse bio->bi_private as the list head. Before | |
47 | * ending this fs bio, we will recover its ->bi_private. | |
48 | */ | |
49 | #define REQ_DM_POLL_LIST REQ_DRV | |
50 | ||
1da177e4 LT |
51 | static const char *_name = DM_NAME; |
52 | ||
2f06cd12 HM |
53 | static unsigned int major; |
54 | static unsigned int _major; | |
1da177e4 | 55 | |
d15b774c AK |
56 | static DEFINE_IDR(_minor_idr); |
57 | ||
f32c10b0 | 58 | static DEFINE_SPINLOCK(_minor_lock); |
2c140a24 MP |
59 | |
60 | static void do_deferred_remove(struct work_struct *w); | |
61 | ||
62 | static DECLARE_WORK(deferred_remove_work, do_deferred_remove); | |
63 | ||
acfe0ad7 MP |
64 | static struct workqueue_struct *deferred_remove_workqueue; |
65 | ||
93e6442c MP |
66 | atomic_t dm_global_event_nr = ATOMIC_INIT(0); |
67 | DECLARE_WAIT_QUEUE_HEAD(dm_global_eventq); | |
68 | ||
62e08243 MP |
69 | void dm_issue_global_event(void) |
70 | { | |
71 | atomic_inc(&dm_global_event_nr); | |
72 | wake_up(&dm_global_eventq); | |
73 | } | |
74 | ||
442761fd MS |
75 | DEFINE_STATIC_KEY_FALSE(stats_enabled); |
76 | DEFINE_STATIC_KEY_FALSE(swap_bios_enabled); | |
77 | DEFINE_STATIC_KEY_FALSE(zoned_enabled); | |
78 | ||
1da177e4 | 79 | /* |
64f52b0e | 80 | * One of these is allocated (on-stack) per original bio. |
1da177e4 | 81 | */ |
64f52b0e | 82 | struct clone_info { |
64f52b0e MS |
83 | struct dm_table *map; |
84 | struct bio *bio; | |
85 | struct dm_io *io; | |
86 | sector_t sector; | |
86a3238c | 87 | unsigned int sector_count; |
4edadf6d MS |
88 | bool is_abnormal_io:1; |
89 | bool submit_as_polled:1; | |
64f52b0e MS |
90 | }; |
91 | ||
6c23f0bd CH |
92 | static inline struct dm_target_io *clone_to_tio(struct bio *clone) |
93 | { | |
94 | return container_of(clone, struct dm_target_io, clone); | |
95 | } | |
96 | ||
64f52b0e MS |
97 | void *dm_per_bio_data(struct bio *bio, size_t data_size) |
98 | { | |
655f3aad | 99 | if (!dm_tio_flagged(clone_to_tio(bio), DM_TIO_INSIDE_DM_IO)) |
62f26317 JX |
100 | return (char *)bio - DM_TARGET_IO_BIO_OFFSET - data_size; |
101 | return (char *)bio - DM_IO_BIO_OFFSET - data_size; | |
64f52b0e MS |
102 | } |
103 | EXPORT_SYMBOL_GPL(dm_per_bio_data); | |
104 | ||
105 | struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size) | |
106 | { | |
107 | struct dm_io *io = (struct dm_io *)((char *)data + data_size); | |
b30f1607 | 108 | |
64f52b0e | 109 | if (io->magic == DM_IO_MAGIC) |
62f26317 | 110 | return (struct bio *)((char *)io + DM_IO_BIO_OFFSET); |
64f52b0e | 111 | BUG_ON(io->magic != DM_TIO_MAGIC); |
62f26317 | 112 | return (struct bio *)((char *)io + DM_TARGET_IO_BIO_OFFSET); |
64f52b0e MS |
113 | } |
114 | EXPORT_SYMBOL_GPL(dm_bio_from_per_bio_data); | |
115 | ||
86a3238c | 116 | unsigned int dm_bio_get_target_bio_nr(const struct bio *bio) |
64f52b0e MS |
117 | { |
118 | return container_of(bio, struct dm_target_io, clone)->target_bio_nr; | |
119 | } | |
120 | EXPORT_SYMBOL_GPL(dm_bio_get_target_bio_nr); | |
121 | ||
ba61fdd1 JM |
122 | #define MINOR_ALLOCED ((void *)-1) |
123 | ||
115485e8 | 124 | #define DM_NUMA_NODE NUMA_NO_NODE |
115485e8 | 125 | static int dm_numa_node = DM_NUMA_NODE; |
faad87df | 126 | |
a666e5c0 MP |
127 | #define DEFAULT_SWAP_BIOS (8 * 1048576 / PAGE_SIZE) |
128 | static int swap_bios = DEFAULT_SWAP_BIOS; | |
129 | static int get_swap_bios(void) | |
130 | { | |
131 | int latch = READ_ONCE(swap_bios); | |
b30f1607 | 132 | |
a666e5c0 MP |
133 | if (unlikely(latch <= 0)) |
134 | latch = DEFAULT_SWAP_BIOS; | |
135 | return latch; | |
136 | } | |
137 | ||
86f1152b BM |
138 | struct table_device { |
139 | struct list_head list; | |
b0b4d7c6 | 140 | refcount_t count; |
86f1152b BM |
141 | struct dm_dev dm_dev; |
142 | }; | |
143 | ||
e8603136 MS |
144 | /* |
145 | * Bio-based DM's mempools' reserved IOs set by the user. | |
146 | */ | |
4cc96131 | 147 | #define RESERVED_BIO_BASED_IOS 16 |
86a3238c | 148 | static unsigned int reserved_bio_based_ios = RESERVED_BIO_BASED_IOS; |
e8603136 | 149 | |
115485e8 MS |
150 | static int __dm_get_module_param_int(int *module_param, int min, int max) |
151 | { | |
6aa7de05 | 152 | int param = READ_ONCE(*module_param); |
115485e8 MS |
153 | int modified_param = 0; |
154 | bool modified = true; | |
155 | ||
156 | if (param < min) | |
157 | modified_param = min; | |
158 | else if (param > max) | |
159 | modified_param = max; | |
160 | else | |
161 | modified = false; | |
162 | ||
163 | if (modified) { | |
164 | (void)cmpxchg(module_param, param, modified_param); | |
165 | param = modified_param; | |
166 | } | |
167 | ||
168 | return param; | |
169 | } | |
170 | ||
86a3238c | 171 | unsigned int __dm_get_module_param(unsigned int *module_param, unsigned int def, unsigned int max) |
f4790826 | 172 | { |
86a3238c HM |
173 | unsigned int param = READ_ONCE(*module_param); |
174 | unsigned int modified_param = 0; | |
f4790826 | 175 | |
09c2d531 MS |
176 | if (!param) |
177 | modified_param = def; | |
178 | else if (param > max) | |
179 | modified_param = max; | |
f4790826 | 180 | |
09c2d531 MS |
181 | if (modified_param) { |
182 | (void)cmpxchg(module_param, param, modified_param); | |
183 | param = modified_param; | |
f4790826 MS |
184 | } |
185 | ||
09c2d531 | 186 | return param; |
f4790826 MS |
187 | } |
188 | ||
86a3238c | 189 | unsigned int dm_get_reserved_bio_based_ios(void) |
e8603136 | 190 | { |
09c2d531 | 191 | return __dm_get_module_param(&reserved_bio_based_ios, |
4cc96131 | 192 | RESERVED_BIO_BASED_IOS, DM_RESERVED_MAX_IOS); |
e8603136 MS |
193 | } |
194 | EXPORT_SYMBOL_GPL(dm_get_reserved_bio_based_ios); | |
195 | ||
86a3238c | 196 | static unsigned int dm_get_numa_node(void) |
115485e8 MS |
197 | { |
198 | return __dm_get_module_param_int(&dm_numa_node, | |
199 | DM_NUMA_NODE, num_online_nodes() - 1); | |
200 | } | |
201 | ||
1da177e4 LT |
202 | static int __init local_init(void) |
203 | { | |
e689fbab | 204 | int r; |
1ae49ea2 | 205 | |
51e5b2bd | 206 | r = dm_uevent_init(); |
51157b4a | 207 | if (r) |
e689fbab | 208 | return r; |
51e5b2bd | 209 | |
57bbf99c | 210 | deferred_remove_workqueue = alloc_ordered_workqueue("kdmremove", 0); |
acfe0ad7 MP |
211 | if (!deferred_remove_workqueue) { |
212 | r = -ENOMEM; | |
213 | goto out_uevent_exit; | |
214 | } | |
215 | ||
1da177e4 LT |
216 | _major = major; |
217 | r = register_blkdev(_major, _name); | |
51157b4a | 218 | if (r < 0) |
acfe0ad7 | 219 | goto out_free_workqueue; |
1da177e4 LT |
220 | |
221 | if (!_major) | |
222 | _major = r; | |
223 | ||
224 | return 0; | |
51157b4a | 225 | |
acfe0ad7 MP |
226 | out_free_workqueue: |
227 | destroy_workqueue(deferred_remove_workqueue); | |
51157b4a KU |
228 | out_uevent_exit: |
229 | dm_uevent_exit(); | |
51157b4a KU |
230 | |
231 | return r; | |
1da177e4 LT |
232 | } |
233 | ||
234 | static void local_exit(void) | |
235 | { | |
acfe0ad7 | 236 | destroy_workqueue(deferred_remove_workqueue); |
2c140a24 | 237 | |
00d59405 | 238 | unregister_blkdev(_major, _name); |
51e5b2bd | 239 | dm_uevent_exit(); |
1da177e4 LT |
240 | |
241 | _major = 0; | |
242 | ||
243 | DMINFO("cleaned up"); | |
244 | } | |
245 | ||
b9249e55 | 246 | static int (*_inits[])(void) __initdata = { |
1da177e4 LT |
247 | local_init, |
248 | dm_target_init, | |
249 | dm_linear_init, | |
250 | dm_stripe_init, | |
952b3557 | 251 | dm_io_init, |
945fa4d2 | 252 | dm_kcopyd_init, |
1da177e4 | 253 | dm_interface_init, |
fd2ed4d2 | 254 | dm_statistics_init, |
1da177e4 LT |
255 | }; |
256 | ||
b9249e55 | 257 | static void (*_exits[])(void) = { |
1da177e4 LT |
258 | local_exit, |
259 | dm_target_exit, | |
260 | dm_linear_exit, | |
261 | dm_stripe_exit, | |
952b3557 | 262 | dm_io_exit, |
945fa4d2 | 263 | dm_kcopyd_exit, |
1da177e4 | 264 | dm_interface_exit, |
fd2ed4d2 | 265 | dm_statistics_exit, |
1da177e4 LT |
266 | }; |
267 | ||
268 | static int __init dm_init(void) | |
269 | { | |
270 | const int count = ARRAY_SIZE(_inits); | |
1da177e4 LT |
271 | int r, i; |
272 | ||
f1cd6cb2 TS |
273 | #if (IS_ENABLED(CONFIG_IMA) && !IS_ENABLED(CONFIG_IMA_DISABLE_HTABLE)) |
274 | DMWARN("CONFIG_IMA_DISABLE_HTABLE is disabled." | |
275 | " Duplicate IMA measurements will not be recorded in the IMA log."); | |
276 | #endif | |
277 | ||
1da177e4 LT |
278 | for (i = 0; i < count; i++) { |
279 | r = _inits[i](); | |
280 | if (r) | |
281 | goto bad; | |
282 | } | |
283 | ||
284 | return 0; | |
f1cd6cb2 | 285 | bad: |
1da177e4 LT |
286 | while (i--) |
287 | _exits[i](); | |
288 | ||
289 | return r; | |
290 | } | |
291 | ||
292 | static void __exit dm_exit(void) | |
293 | { | |
294 | int i = ARRAY_SIZE(_exits); | |
295 | ||
296 | while (i--) | |
297 | _exits[i](); | |
d15b774c AK |
298 | |
299 | /* | |
300 | * Should be empty by this point. | |
301 | */ | |
d15b774c | 302 | idr_destroy(&_minor_idr); |
1da177e4 LT |
303 | } |
304 | ||
305 | /* | |
306 | * Block device functions | |
307 | */ | |
432a212c MA |
308 | int dm_deleting_md(struct mapped_device *md) |
309 | { | |
310 | return test_bit(DMF_DELETING, &md->flags); | |
311 | } | |
312 | ||
05bdb996 | 313 | static int dm_blk_open(struct gendisk *disk, blk_mode_t mode) |
1da177e4 LT |
314 | { |
315 | struct mapped_device *md; | |
316 | ||
fba9f90e JM |
317 | spin_lock(&_minor_lock); |
318 | ||
d32e2bf8 | 319 | md = disk->private_data; |
fba9f90e JM |
320 | if (!md) |
321 | goto out; | |
322 | ||
5c6bd75d | 323 | if (test_bit(DMF_FREEING, &md->flags) || |
432a212c | 324 | dm_deleting_md(md)) { |
fba9f90e JM |
325 | md = NULL; |
326 | goto out; | |
327 | } | |
328 | ||
1da177e4 | 329 | dm_get(md); |
5c6bd75d | 330 | atomic_inc(&md->open_count); |
fba9f90e JM |
331 | out: |
332 | spin_unlock(&_minor_lock); | |
333 | ||
334 | return md ? 0 : -ENXIO; | |
1da177e4 LT |
335 | } |
336 | ||
ae220766 | 337 | static void dm_blk_close(struct gendisk *disk) |
1da177e4 | 338 | { |
63a4f065 | 339 | struct mapped_device *md; |
6e9624b8 | 340 | |
4a1aeb98 MB |
341 | spin_lock(&_minor_lock); |
342 | ||
63a4f065 MS |
343 | md = disk->private_data; |
344 | if (WARN_ON(!md)) | |
345 | goto out; | |
346 | ||
2c140a24 MP |
347 | if (atomic_dec_and_test(&md->open_count) && |
348 | (test_bit(DMF_DEFERRED_REMOVE, &md->flags))) | |
acfe0ad7 | 349 | queue_work(deferred_remove_workqueue, &deferred_remove_work); |
2c140a24 | 350 | |
1da177e4 | 351 | dm_put(md); |
63a4f065 | 352 | out: |
4a1aeb98 | 353 | spin_unlock(&_minor_lock); |
1da177e4 LT |
354 | } |
355 | ||
5c6bd75d AK |
356 | int dm_open_count(struct mapped_device *md) |
357 | { | |
358 | return atomic_read(&md->open_count); | |
359 | } | |
360 | ||
361 | /* | |
362 | * Guarantees nothing is using the device before it's deleted. | |
363 | */ | |
2c140a24 | 364 | int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred) |
5c6bd75d AK |
365 | { |
366 | int r = 0; | |
367 | ||
368 | spin_lock(&_minor_lock); | |
369 | ||
2c140a24 | 370 | if (dm_open_count(md)) { |
5c6bd75d | 371 | r = -EBUSY; |
2c140a24 MP |
372 | if (mark_deferred) |
373 | set_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
374 | } else if (only_deferred && !test_bit(DMF_DEFERRED_REMOVE, &md->flags)) | |
375 | r = -EEXIST; | |
5c6bd75d AK |
376 | else |
377 | set_bit(DMF_DELETING, &md->flags); | |
378 | ||
379 | spin_unlock(&_minor_lock); | |
380 | ||
381 | return r; | |
382 | } | |
383 | ||
2c140a24 MP |
384 | int dm_cancel_deferred_remove(struct mapped_device *md) |
385 | { | |
386 | int r = 0; | |
387 | ||
388 | spin_lock(&_minor_lock); | |
389 | ||
390 | if (test_bit(DMF_DELETING, &md->flags)) | |
391 | r = -EBUSY; | |
392 | else | |
393 | clear_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
394 | ||
395 | spin_unlock(&_minor_lock); | |
396 | ||
397 | return r; | |
398 | } | |
399 | ||
400 | static void do_deferred_remove(struct work_struct *w) | |
401 | { | |
402 | dm_deferred_remove(); | |
403 | } | |
404 | ||
3ac51e74 DW |
405 | static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
406 | { | |
407 | struct mapped_device *md = bdev->bd_disk->private_data; | |
408 | ||
409 | return dm_get_geometry(md, geo); | |
410 | } | |
411 | ||
971888c4 | 412 | static int dm_prepare_ioctl(struct mapped_device *md, int *srcu_idx, |
5bd5e8d8 | 413 | struct block_device **bdev) |
aa129a22 | 414 | { |
564b5c54 | 415 | struct dm_target *ti; |
6c182cd8 | 416 | struct dm_table *map; |
971888c4 | 417 | int r; |
aa129a22 | 418 | |
6c182cd8 | 419 | retry: |
e56f81e0 | 420 | r = -ENOTTY; |
971888c4 | 421 | map = dm_get_live_table(md, srcu_idx); |
aa129a22 | 422 | if (!map || !dm_table_get_size(map)) |
971888c4 | 423 | return r; |
aa129a22 MB |
424 | |
425 | /* We only support devices that have a single target */ | |
2aec377a | 426 | if (map->num_targets != 1) |
971888c4 | 427 | return r; |
aa129a22 | 428 | |
564b5c54 MS |
429 | ti = dm_table_get_target(map, 0); |
430 | if (!ti->type->prepare_ioctl) | |
971888c4 | 431 | return r; |
519049af | 432 | |
971888c4 MS |
433 | if (dm_suspended_md(md)) |
434 | return -EAGAIN; | |
aa129a22 | 435 | |
564b5c54 | 436 | r = ti->type->prepare_ioctl(ti, bdev); |
5bbbfdf6 | 437 | if (r == -ENOTCONN && !fatal_signal_pending(current)) { |
971888c4 | 438 | dm_put_live_table(md, *srcu_idx); |
238d991f | 439 | fsleep(10000); |
6c182cd8 HR |
440 | goto retry; |
441 | } | |
971888c4 | 442 | |
e56f81e0 CH |
443 | return r; |
444 | } | |
445 | ||
971888c4 | 446 | static void dm_unprepare_ioctl(struct mapped_device *md, int srcu_idx) |
971888c4 MS |
447 | { |
448 | dm_put_live_table(md, srcu_idx); | |
449 | } | |
450 | ||
05bdb996 | 451 | static int dm_blk_ioctl(struct block_device *bdev, blk_mode_t mode, |
e56f81e0 CH |
452 | unsigned int cmd, unsigned long arg) |
453 | { | |
454 | struct mapped_device *md = bdev->bd_disk->private_data; | |
971888c4 | 455 | int r, srcu_idx; |
e56f81e0 | 456 | |
5bd5e8d8 | 457 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
e56f81e0 | 458 | if (r < 0) |
971888c4 | 459 | goto out; |
6c182cd8 | 460 | |
e56f81e0 CH |
461 | if (r > 0) { |
462 | /* | |
e980f623 CH |
463 | * Target determined this ioctl is being issued against a |
464 | * subset of the parent bdev; require extra privileges. | |
e56f81e0 | 465 | */ |
e980f623 | 466 | if (!capable(CAP_SYS_RAWIO)) { |
0378c625 | 467 | DMDEBUG_LIMIT( |
e980f623 CH |
468 | "%s: sending ioctl %x to DM device without required privilege.", |
469 | current->comm, cmd); | |
470 | r = -ENOIOCTLCMD; | |
e56f81e0 | 471 | goto out; |
e980f623 | 472 | } |
e56f81e0 | 473 | } |
6c182cd8 | 474 | |
a7cb3d2f CH |
475 | if (!bdev->bd_disk->fops->ioctl) |
476 | r = -ENOTTY; | |
477 | else | |
478 | r = bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg); | |
e56f81e0 | 479 | out: |
971888c4 | 480 | dm_unprepare_ioctl(md, srcu_idx); |
aa129a22 MB |
481 | return r; |
482 | } | |
483 | ||
7465d7ac MS |
484 | u64 dm_start_time_ns_from_clone(struct bio *bio) |
485 | { | |
6c23f0bd | 486 | return jiffies_to_nsecs(clone_to_tio(bio)->io->start_time); |
7465d7ac MS |
487 | } |
488 | EXPORT_SYMBOL_GPL(dm_start_time_ns_from_clone); | |
489 | ||
06eed768 | 490 | static inline bool bio_is_flush_with_data(struct bio *bio) |
7465d7ac | 491 | { |
8d394bc4 MS |
492 | return ((bio->bi_opf & REQ_PREFLUSH) && bio->bi_iter.bi_size); |
493 | } | |
494 | ||
06eed768 | 495 | static inline unsigned int dm_io_sectors(struct dm_io *io, struct bio *bio) |
8d394bc4 | 496 | { |
d3de6d12 ML |
497 | /* |
498 | * If REQ_PREFLUSH set, don't account payload, it will be | |
499 | * submitted (and accounted) after this flush completes. | |
500 | */ | |
501 | if (bio_is_flush_with_data(bio)) | |
06eed768 MS |
502 | return 0; |
503 | if (unlikely(dm_io_flagged(io, DM_IO_WAS_SPLIT))) | |
504 | return io->sectors; | |
505 | return bio_sectors(bio); | |
506 | } | |
8d394bc4 | 507 | |
06eed768 MS |
508 | static void dm_io_acct(struct dm_io *io, bool end) |
509 | { | |
510 | struct bio *bio = io->orig_bio; | |
8d394bc4 | 511 | |
526d1006 LN |
512 | if (dm_io_flagged(io, DM_IO_BLK_STAT)) { |
513 | if (!end) | |
514 | bdev_start_io_acct(bio->bi_bdev, bio_op(bio), | |
06eed768 | 515 | io->start_time); |
526d1006 LN |
516 | else |
517 | bdev_end_io_acct(bio->bi_bdev, bio_op(bio), | |
06eed768 MS |
518 | dm_io_sectors(io, bio), |
519 | io->start_time); | |
526d1006 | 520 | } |
7465d7ac | 521 | |
442761fd | 522 | if (static_branch_unlikely(&stats_enabled) && |
06eed768 | 523 | unlikely(dm_stats_used(&io->md->stats))) { |
7dd76d1f ML |
524 | sector_t sector; |
525 | ||
06eed768 | 526 | if (unlikely(dm_io_flagged(io, DM_IO_WAS_SPLIT))) |
7dd76d1f | 527 | sector = bio_end_sector(bio) - io->sector_offset; |
06eed768 MS |
528 | else |
529 | sector = bio->bi_iter.bi_sector; | |
7dd76d1f | 530 | |
06eed768 MS |
531 | dm_stats_account_io(&io->md->stats, bio_data_dir(bio), |
532 | sector, dm_io_sectors(io, bio), | |
533 | end, io->start_time, &io->stats_aux); | |
7dd76d1f | 534 | } |
8d394bc4 MS |
535 | } |
536 | ||
b992b40d | 537 | static void __dm_start_io_acct(struct dm_io *io) |
8d394bc4 | 538 | { |
e6926ad0 | 539 | dm_io_acct(io, false); |
7465d7ac MS |
540 | } |
541 | ||
0fbb4d93 | 542 | static void dm_start_io_acct(struct dm_io *io, struct bio *clone) |
7465d7ac | 543 | { |
0fbb4d93 MS |
544 | /* |
545 | * Ensure IO accounting is only ever started once. | |
0fbb4d93 | 546 | */ |
3b03f7c1 MS |
547 | if (dm_io_flagged(io, DM_IO_ACCOUNTED)) |
548 | return; | |
549 | ||
550 | /* Expect no possibility for race unless DM_TIO_IS_DUPLICATE_BIO. */ | |
551 | if (!clone || likely(dm_tio_is_normal(clone_to_tio(clone)))) { | |
82f6cdcc MS |
552 | dm_io_set_flag(io, DM_IO_ACCOUNTED); |
553 | } else { | |
554 | unsigned long flags; | |
655f3aad | 555 | /* Can afford locking given DM_TIO_IS_DUPLICATE_BIO */ |
4d7bca13 | 556 | spin_lock_irqsave(&io->lock, flags); |
10eb3a0d BM |
557 | if (dm_io_flagged(io, DM_IO_ACCOUNTED)) { |
558 | spin_unlock_irqrestore(&io->lock, flags); | |
559 | return; | |
560 | } | |
82f6cdcc | 561 | dm_io_set_flag(io, DM_IO_ACCOUNTED); |
4d7bca13 | 562 | spin_unlock_irqrestore(&io->lock, flags); |
82f6cdcc | 563 | } |
7465d7ac | 564 | |
b992b40d | 565 | __dm_start_io_acct(io); |
0fbb4d93 | 566 | } |
7465d7ac | 567 | |
b992b40d | 568 | static void dm_end_io_acct(struct dm_io *io) |
0fbb4d93 | 569 | { |
e6926ad0 | 570 | dm_io_acct(io, true); |
7465d7ac | 571 | } |
978e51ba | 572 | |
6f25dd1c | 573 | static struct dm_io *alloc_io(struct mapped_device *md, struct bio *bio, gfp_t gfp_mask) |
1da177e4 | 574 | { |
64f52b0e MS |
575 | struct dm_io *io; |
576 | struct dm_target_io *tio; | |
577 | struct bio *clone; | |
578 | ||
6f25dd1c MS |
579 | clone = bio_alloc_clone(NULL, bio, gfp_mask, &md->mempools->io_bs); |
580 | if (unlikely(!clone)) | |
581 | return NULL; | |
6c23f0bd | 582 | tio = clone_to_tio(clone); |
655f3aad MS |
583 | tio->flags = 0; |
584 | dm_tio_set_flag(tio, DM_TIO_INSIDE_DM_IO); | |
64f52b0e MS |
585 | tio->io = NULL; |
586 | ||
587 | io = container_of(tio, struct dm_io, tio); | |
588 | io->magic = DM_IO_MAGIC; | |
84b98f4c | 589 | io->status = BLK_STS_OK; |
0f14d60a ML |
590 | |
591 | /* one ref is for submission, the other is for completion */ | |
592 | atomic_set(&io->io_count, 2); | |
9f6dc633 | 593 | this_cpu_inc(*md->pending_io); |
7dd76d1f | 594 | io->orig_bio = bio; |
978e51ba | 595 | io->md = md; |
4d7bca13 | 596 | spin_lock_init(&io->lock); |
b879f915 | 597 | io->start_time = jiffies; |
82f6cdcc | 598 | io->flags = 0; |
526d1006 LN |
599 | if (blk_queue_io_stat(md->queue)) |
600 | dm_io_set_flag(io, DM_IO_BLK_STAT); | |
64f52b0e | 601 | |
c4f512d2 MS |
602 | if (static_branch_unlikely(&stats_enabled) && |
603 | unlikely(dm_stats_used(&md->stats))) | |
442761fd | 604 | dm_stats_record_start(&md->stats, &io->stats_aux); |
64f52b0e MS |
605 | |
606 | return io; | |
1da177e4 LT |
607 | } |
608 | ||
0119ab14 | 609 | static void free_io(struct dm_io *io) |
1da177e4 | 610 | { |
64f52b0e MS |
611 | bio_put(&io->tio.clone); |
612 | } | |
613 | ||
1d1068ce | 614 | static struct bio *alloc_tio(struct clone_info *ci, struct dm_target *ti, |
86a3238c | 615 | unsigned int target_bio_nr, unsigned int *len, gfp_t gfp_mask) |
64f52b0e | 616 | { |
9dd1cd32 | 617 | struct mapped_device *md = ci->io->md; |
64f52b0e | 618 | struct dm_target_io *tio; |
018b05eb | 619 | struct bio *clone; |
64f52b0e MS |
620 | |
621 | if (!ci->io->tio.io) { | |
622 | /* the dm_target_io embedded in ci->io is available */ | |
623 | tio = &ci->io->tio; | |
018b05eb MS |
624 | /* alloc_io() already initialized embedded clone */ |
625 | clone = &tio->clone; | |
64f52b0e | 626 | } else { |
29dec90a CH |
627 | clone = bio_alloc_clone(NULL, ci->bio, gfp_mask, |
628 | &md->mempools->bs); | |
64f52b0e MS |
629 | if (!clone) |
630 | return NULL; | |
631 | ||
b99fdcdc ML |
632 | /* REQ_DM_POLL_LIST shouldn't be inherited */ |
633 | clone->bi_opf &= ~REQ_DM_POLL_LIST; | |
634 | ||
6c23f0bd | 635 | tio = clone_to_tio(clone); |
655f3aad | 636 | tio->flags = 0; /* also clears DM_TIO_INSIDE_DM_IO */ |
64f52b0e MS |
637 | } |
638 | ||
639 | tio->magic = DM_TIO_MAGIC; | |
640 | tio->io = ci->io; | |
641 | tio->ti = ti; | |
642 | tio->target_bio_nr = target_bio_nr; | |
dc8e2021 | 643 | tio->len_ptr = len; |
743598f0 | 644 | tio->old_sector = 0; |
64f52b0e | 645 | |
9dd1cd32 MS |
646 | /* Set default bdev, but target must bio_set_dev() before issuing IO */ |
647 | clone->bi_bdev = md->disk->part0; | |
648 | if (unlikely(ti->needs_bio_set_dev)) | |
649 | bio_set_dev(clone, md->disk->part0); | |
650 | ||
018b05eb MS |
651 | if (len) { |
652 | clone->bi_iter.bi_size = to_bytes(*len); | |
653 | if (bio_integrity(clone)) | |
654 | bio_integrity_trim(clone); | |
655 | } | |
64f52b0e | 656 | |
018b05eb | 657 | return clone; |
1da177e4 LT |
658 | } |
659 | ||
1d1068ce | 660 | static void free_tio(struct bio *clone) |
1da177e4 | 661 | { |
655f3aad | 662 | if (dm_tio_flagged(clone_to_tio(clone), DM_TIO_INSIDE_DM_IO)) |
64f52b0e | 663 | return; |
1d1068ce | 664 | bio_put(clone); |
1da177e4 LT |
665 | } |
666 | ||
667 | /* | |
668 | * Add the bio to the list of deferred io. | |
669 | */ | |
92c63902 | 670 | static void queue_io(struct mapped_device *md, struct bio *bio) |
1da177e4 | 671 | { |
05447420 | 672 | unsigned long flags; |
1da177e4 | 673 | |
05447420 | 674 | spin_lock_irqsave(&md->deferred_lock, flags); |
1da177e4 | 675 | bio_list_add(&md->deferred, bio); |
05447420 | 676 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
6a8736d1 | 677 | queue_work(md->wq, &md->work); |
1da177e4 LT |
678 | } |
679 | ||
680 | /* | |
681 | * Everyone (including functions in this file), should use this | |
682 | * function to access the md->map field, and make sure they call | |
83d5e5b0 | 683 | * dm_put_live_table() when finished. |
1da177e4 | 684 | */ |
563a225c MS |
685 | struct dm_table *dm_get_live_table(struct mapped_device *md, |
686 | int *srcu_idx) __acquires(md->io_barrier) | |
1da177e4 | 687 | { |
83d5e5b0 MP |
688 | *srcu_idx = srcu_read_lock(&md->io_barrier); |
689 | ||
690 | return srcu_dereference(md->map, &md->io_barrier); | |
691 | } | |
1da177e4 | 692 | |
563a225c MS |
693 | void dm_put_live_table(struct mapped_device *md, |
694 | int srcu_idx) __releases(md->io_barrier) | |
83d5e5b0 MP |
695 | { |
696 | srcu_read_unlock(&md->io_barrier, srcu_idx); | |
697 | } | |
698 | ||
699 | void dm_sync_table(struct mapped_device *md) | |
700 | { | |
701 | synchronize_srcu(&md->io_barrier); | |
702 | synchronize_rcu_expedited(); | |
703 | } | |
704 | ||
705 | /* | |
706 | * A fast alternative to dm_get_live_table/dm_put_live_table. | |
707 | * The caller must not block between these two functions. | |
708 | */ | |
709 | static struct dm_table *dm_get_live_table_fast(struct mapped_device *md) __acquires(RCU) | |
710 | { | |
711 | rcu_read_lock(); | |
712 | return rcu_dereference(md->map); | |
713 | } | |
1da177e4 | 714 | |
83d5e5b0 MP |
715 | static void dm_put_live_table_fast(struct mapped_device *md) __releases(RCU) |
716 | { | |
717 | rcu_read_unlock(); | |
1da177e4 LT |
718 | } |
719 | ||
971888c4 MS |
720 | static char *_dm_claim_ptr = "I belong to device-mapper"; |
721 | ||
86f1152b BM |
722 | /* |
723 | * Open a table device so we can use it as a map destination. | |
724 | */ | |
b9a785d2 | 725 | static struct table_device *open_table_device(struct mapped_device *md, |
05bdb996 | 726 | dev_t dev, blk_mode_t mode) |
86f1152b | 727 | { |
b9a785d2 | 728 | struct table_device *td; |
a28d893e CB |
729 | struct file *bdev_file; |
730 | struct block_device *bdev; | |
cd913c76 | 731 | u64 part_off; |
86f1152b BM |
732 | int r; |
733 | ||
b9a785d2 CH |
734 | td = kmalloc_node(sizeof(*td), GFP_KERNEL, md->numa_node_id); |
735 | if (!td) | |
736 | return ERR_PTR(-ENOMEM); | |
737 | refcount_set(&td->count, 1); | |
86f1152b | 738 | |
a28d893e CB |
739 | bdev_file = bdev_file_open_by_dev(dev, mode, _dm_claim_ptr, NULL); |
740 | if (IS_ERR(bdev_file)) { | |
741 | r = PTR_ERR(bdev_file); | |
b9a785d2 CH |
742 | goto out_free_td; |
743 | } | |
86f1152b | 744 | |
a28d893e CB |
745 | bdev = file_bdev(bdev_file); |
746 | ||
1a581b72 CH |
747 | /* |
748 | * We can be called before the dm disk is added. In that case we can't | |
749 | * register the holder relation here. It will be done once add_disk was | |
750 | * called. | |
751 | */ | |
752 | if (md->disk->slave_dir) { | |
a28d893e | 753 | r = bd_link_disk_holder(bdev, md->disk); |
1a581b72 CH |
754 | if (r) |
755 | goto out_blkdev_put; | |
756 | } | |
86f1152b | 757 | |
b9a785d2 | 758 | td->dm_dev.mode = mode; |
a28d893e CB |
759 | td->dm_dev.bdev = bdev; |
760 | td->dm_dev.bdev_file = bdev_file; | |
761 | td->dm_dev.dax_dev = fs_dax_get_by_bdev(bdev, &part_off, | |
c2fce61f | 762 | NULL, NULL); |
b9a785d2 CH |
763 | format_dev_t(td->dm_dev.name, dev); |
764 | list_add(&td->list, &md->table_devices); | |
765 | return td; | |
766 | ||
767 | out_blkdev_put: | |
a28d893e | 768 | fput(bdev_file); |
b9a785d2 CH |
769 | out_free_td: |
770 | kfree(td); | |
771 | return ERR_PTR(r); | |
86f1152b BM |
772 | } |
773 | ||
774 | /* | |
775 | * Close a table device that we've been using. | |
776 | */ | |
777 | static void close_table_device(struct table_device *td, struct mapped_device *md) | |
778 | { | |
1a581b72 CH |
779 | if (md->disk->slave_dir) |
780 | bd_unlink_disk_holder(td->dm_dev.bdev, md->disk); | |
a28d893e | 781 | fput(td->dm_dev.bdev_file); |
817bf402 | 782 | put_dax(td->dm_dev.dax_dev); |
7b586583 CH |
783 | list_del(&td->list); |
784 | kfree(td); | |
86f1152b BM |
785 | } |
786 | ||
787 | static struct table_device *find_table_device(struct list_head *l, dev_t dev, | |
05bdb996 | 788 | blk_mode_t mode) |
8454fca4 | 789 | { |
86f1152b BM |
790 | struct table_device *td; |
791 | ||
792 | list_for_each_entry(td, l, list) | |
793 | if (td->dm_dev.bdev->bd_dev == dev && td->dm_dev.mode == mode) | |
794 | return td; | |
795 | ||
796 | return NULL; | |
797 | } | |
798 | ||
05bdb996 | 799 | int dm_get_table_device(struct mapped_device *md, dev_t dev, blk_mode_t mode, |
8454fca4 SS |
800 | struct dm_dev **result) |
801 | { | |
86f1152b BM |
802 | struct table_device *td; |
803 | ||
804 | mutex_lock(&md->table_devices_lock); | |
805 | td = find_table_device(&md->table_devices, dev, mode); | |
806 | if (!td) { | |
b9a785d2 CH |
807 | td = open_table_device(md, dev, mode); |
808 | if (IS_ERR(td)) { | |
86f1152b | 809 | mutex_unlock(&md->table_devices_lock); |
b9a785d2 | 810 | return PTR_ERR(td); |
86f1152b | 811 | } |
b0b4d7c6 ER |
812 | } else { |
813 | refcount_inc(&td->count); | |
86f1152b | 814 | } |
86f1152b BM |
815 | mutex_unlock(&md->table_devices_lock); |
816 | ||
817 | *result = &td->dm_dev; | |
818 | return 0; | |
819 | } | |
86f1152b BM |
820 | |
821 | void dm_put_table_device(struct mapped_device *md, struct dm_dev *d) | |
822 | { | |
823 | struct table_device *td = container_of(d, struct table_device, dm_dev); | |
824 | ||
825 | mutex_lock(&md->table_devices_lock); | |
7b586583 | 826 | if (refcount_dec_and_test(&td->count)) |
86f1152b | 827 | close_table_device(td, md); |
86f1152b BM |
828 | mutex_unlock(&md->table_devices_lock); |
829 | } | |
86f1152b | 830 | |
3ac51e74 DW |
831 | /* |
832 | * Get the geometry associated with a dm device | |
833 | */ | |
834 | int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo) | |
835 | { | |
836 | *geo = md->geometry; | |
837 | ||
838 | return 0; | |
839 | } | |
840 | ||
841 | /* | |
842 | * Set the geometry of a device. | |
843 | */ | |
844 | int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo) | |
845 | { | |
846 | sector_t sz = (sector_t)geo->cylinders * geo->heads * geo->sectors; | |
847 | ||
848 | if (geo->start > sz) { | |
43e6c111 | 849 | DMERR("Start sector is beyond the geometry limits."); |
3ac51e74 DW |
850 | return -EINVAL; |
851 | } | |
852 | ||
853 | md->geometry = *geo; | |
854 | ||
855 | return 0; | |
856 | } | |
857 | ||
2e93ccc1 KU |
858 | static int __noflush_suspending(struct mapped_device *md) |
859 | { | |
860 | return test_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); | |
861 | } | |
862 | ||
8b211aac | 863 | static void dm_requeue_add_io(struct dm_io *io, bool first_stage) |
1da177e4 | 864 | { |
b35f8caa | 865 | struct mapped_device *md = io->md; |
1da177e4 | 866 | |
8b211aac ML |
867 | if (first_stage) { |
868 | struct dm_io *next = md->requeue_list; | |
869 | ||
870 | md->requeue_list = io; | |
871 | io->next = next; | |
872 | } else { | |
873 | bio_list_add_head(&md->deferred, io->orig_bio); | |
874 | } | |
875 | } | |
876 | ||
877 | static void dm_kick_requeue(struct mapped_device *md, bool first_stage) | |
878 | { | |
879 | if (first_stage) | |
880 | queue_work(md->wq, &md->requeue_work); | |
881 | else | |
882 | queue_work(md->wq, &md->work); | |
883 | } | |
884 | ||
444fe04f ML |
885 | /* |
886 | * Return true if the dm_io's original bio is requeued. | |
887 | * io->status is updated with error if requeue disallowed. | |
888 | */ | |
8b211aac | 889 | static bool dm_handle_requeue(struct dm_io *io, bool first_stage) |
1da177e4 | 890 | { |
8b211aac | 891 | struct bio *bio = io->orig_bio; |
444fe04f ML |
892 | bool handle_requeue = (io->status == BLK_STS_DM_REQUEUE); |
893 | bool handle_polled_eagain = ((io->status == BLK_STS_AGAIN) && | |
894 | (bio->bi_opf & REQ_POLLED)); | |
895 | struct mapped_device *md = io->md; | |
896 | bool requeued = false; | |
1da177e4 | 897 | |
444fe04f | 898 | if (handle_requeue || handle_polled_eagain) { |
e2736347 | 899 | unsigned long flags; |
444fe04f ML |
900 | |
901 | if (bio->bi_opf & REQ_POLLED) { | |
902 | /* | |
903 | * Upper layer won't help us poll split bio | |
904 | * (io->orig_bio may only reflect a subset of the | |
905 | * pre-split original) so clear REQ_POLLED. | |
906 | */ | |
907 | bio_clear_polled(bio); | |
908 | } | |
909 | ||
e2736347 | 910 | /* |
444fe04f ML |
911 | * Target requested pushing back the I/O or |
912 | * polled IO hit BLK_STS_AGAIN. | |
e2736347 MS |
913 | */ |
914 | spin_lock_irqsave(&md->deferred_lock, flags); | |
444fe04f ML |
915 | if ((__noflush_suspending(md) && |
916 | !WARN_ON_ONCE(dm_is_zone_write(md, bio))) || | |
8b211aac ML |
917 | handle_polled_eagain || first_stage) { |
918 | dm_requeue_add_io(io, first_stage); | |
444fe04f | 919 | requeued = true; |
e2736347 | 920 | } else { |
2e93ccc1 | 921 | /* |
e2736347 MS |
922 | * noflush suspend was interrupted or this is |
923 | * a write to a zoned target. | |
2e93ccc1 | 924 | */ |
e2736347 | 925 | io->status = BLK_STS_IOERR; |
2e93ccc1 | 926 | } |
e2736347 MS |
927 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
928 | } | |
2e93ccc1 | 929 | |
444fe04f | 930 | if (requeued) |
8b211aac | 931 | dm_kick_requeue(md, first_stage); |
444fe04f ML |
932 | |
933 | return requeued; | |
934 | } | |
935 | ||
8b211aac | 936 | static void __dm_io_complete(struct dm_io *io, bool first_stage) |
444fe04f | 937 | { |
8b211aac | 938 | struct bio *bio = io->orig_bio; |
444fe04f ML |
939 | struct mapped_device *md = io->md; |
940 | blk_status_t io_error; | |
941 | bool requeued; | |
942 | ||
8b211aac ML |
943 | requeued = dm_handle_requeue(io, first_stage); |
944 | if (requeued && first_stage) | |
945 | return; | |
444fe04f | 946 | |
e2736347 | 947 | io_error = io->status; |
82f6cdcc | 948 | if (dm_io_flagged(io, DM_IO_ACCOUNTED)) |
b992b40d | 949 | dm_end_io_acct(io); |
e2736347 MS |
950 | else if (!io_error) { |
951 | /* | |
952 | * Must handle target that DM_MAPIO_SUBMITTED only to | |
953 | * then bio_endio() rather than dm_submit_bio_remap() | |
954 | */ | |
b992b40d ML |
955 | __dm_start_io_acct(io); |
956 | dm_end_io_acct(io); | |
e2736347 MS |
957 | } |
958 | free_io(io); | |
959 | smp_wmb(); | |
960 | this_cpu_dec(*md->pending_io); | |
6a8736d1 | 961 | |
e2736347 MS |
962 | /* nudge anyone waiting on suspend queue */ |
963 | if (unlikely(wq_has_sleeper(&md->wait))) | |
964 | wake_up(&md->wait); | |
2e93ccc1 | 965 | |
444fe04f ML |
966 | /* Return early if the original bio was requeued */ |
967 | if (requeued) | |
968 | return; | |
e2736347 MS |
969 | |
970 | if (bio_is_flush_with_data(bio)) { | |
971 | /* | |
972 | * Preflush done for flush with data, reissue | |
973 | * without REQ_PREFLUSH. | |
974 | */ | |
975 | bio->bi_opf &= ~REQ_PREFLUSH; | |
976 | queue_io(md, bio); | |
977 | } else { | |
978 | /* done with normal IO or empty flush */ | |
979 | if (io_error) | |
980 | bio->bi_status = io_error; | |
981 | bio_endio(bio); | |
982 | } | |
983 | } | |
984 | ||
8b211aac ML |
985 | static void dm_wq_requeue_work(struct work_struct *work) |
986 | { | |
987 | struct mapped_device *md = container_of(work, struct mapped_device, | |
988 | requeue_work); | |
989 | unsigned long flags; | |
990 | struct dm_io *io; | |
991 | ||
992 | /* reuse deferred lock to simplify dm_handle_requeue */ | |
993 | spin_lock_irqsave(&md->deferred_lock, flags); | |
994 | io = md->requeue_list; | |
995 | md->requeue_list = NULL; | |
996 | spin_unlock_irqrestore(&md->deferred_lock, flags); | |
997 | ||
998 | while (io) { | |
999 | struct dm_io *next = io->next; | |
1000 | ||
46754bd0 | 1001 | dm_io_rewind(io, &md->disk->bio_split); |
8b211aac ML |
1002 | |
1003 | io->next = NULL; | |
1004 | __dm_io_complete(io, false); | |
1005 | io = next; | |
f77692d6 | 1006 | cond_resched(); |
8b211aac ML |
1007 | } |
1008 | } | |
1009 | ||
1010 | /* | |
1011 | * Two staged requeue: | |
1012 | * | |
1013 | * 1) io->orig_bio points to the real original bio, and the part mapped to | |
1014 | * this io must be requeued, instead of other parts of the original bio. | |
1015 | * | |
1016 | * 2) io->orig_bio points to new cloned bio which matches the requeued dm_io. | |
1017 | */ | |
1018 | static void dm_io_complete(struct dm_io *io) | |
1019 | { | |
1020 | bool first_requeue; | |
1021 | ||
1022 | /* | |
1023 | * Only dm_io that has been split needs two stage requeue, otherwise | |
1024 | * we may run into long bio clone chain during suspend and OOM could | |
1025 | * be triggered. | |
1026 | * | |
1027 | * Also flush data dm_io won't be marked as DM_IO_WAS_SPLIT, so they | |
1028 | * also aren't handled via the first stage requeue. | |
1029 | */ | |
1030 | if (dm_io_flagged(io, DM_IO_WAS_SPLIT)) | |
1031 | first_requeue = true; | |
1032 | else | |
1033 | first_requeue = false; | |
1034 | ||
1035 | __dm_io_complete(io, first_requeue); | |
1036 | } | |
1037 | ||
1da177e4 LT |
1038 | /* |
1039 | * Decrements the number of outstanding ios that a bio has been | |
1040 | * cloned into, completing the original io if necc. | |
1041 | */ | |
84b98f4c MS |
1042 | static inline void __dm_io_dec_pending(struct dm_io *io) |
1043 | { | |
1044 | if (atomic_dec_and_test(&io->io_count)) | |
1045 | dm_io_complete(io); | |
1046 | } | |
1047 | ||
1048 | static void dm_io_set_error(struct dm_io *io, blk_status_t error) | |
1da177e4 | 1049 | { |
84b98f4c MS |
1050 | unsigned long flags; |
1051 | ||
2e93ccc1 | 1052 | /* Push-back supersedes any I/O errors */ |
84b98f4c MS |
1053 | spin_lock_irqsave(&io->lock, flags); |
1054 | if (!(io->status == BLK_STS_DM_REQUEUE && | |
1055 | __noflush_suspending(io->md))) { | |
1056 | io->status = error; | |
1da177e4 | 1057 | } |
84b98f4c MS |
1058 | spin_unlock_irqrestore(&io->lock, flags); |
1059 | } | |
1da177e4 | 1060 | |
2e803cd9 | 1061 | static void dm_io_dec_pending(struct dm_io *io, blk_status_t error) |
84b98f4c MS |
1062 | { |
1063 | if (unlikely(error)) | |
1064 | dm_io_set_error(io, error); | |
1065 | ||
1066 | __dm_io_dec_pending(io); | |
1da177e4 LT |
1067 | } |
1068 | ||
f7995089 MS |
1069 | /* |
1070 | * The queue_limits are only valid as long as you have a reference | |
1071 | * count on 'md'. But _not_ imposing verification to avoid atomic_read(), | |
1072 | */ | |
1073 | static inline struct queue_limits *dm_get_queue_limits(struct mapped_device *md) | |
1074 | { | |
1075 | return &md->queue->limits; | |
1076 | } | |
1077 | ||
bcb44433 MS |
1078 | void disable_discard(struct mapped_device *md) |
1079 | { | |
1080 | struct queue_limits *limits = dm_get_queue_limits(md); | |
1081 | ||
1082 | /* device doesn't really support DISCARD, disable it */ | |
1083 | limits->max_discard_sectors = 0; | |
bcb44433 MS |
1084 | } |
1085 | ||
ac62d620 CH |
1086 | void disable_write_zeroes(struct mapped_device *md) |
1087 | { | |
1088 | struct queue_limits *limits = dm_get_queue_limits(md); | |
1089 | ||
1090 | /* device doesn't really support WRITE ZEROES, disable it */ | |
1091 | limits->max_write_zeroes_sectors = 0; | |
1092 | } | |
1093 | ||
a666e5c0 MP |
1094 | static bool swap_bios_limit(struct dm_target *ti, struct bio *bio) |
1095 | { | |
1096 | return unlikely((bio->bi_opf & REQ_SWAP) != 0) && unlikely(ti->limit_swap_bios); | |
1097 | } | |
1098 | ||
4246a0b6 | 1099 | static void clone_endio(struct bio *bio) |
1da177e4 | 1100 | { |
4e4cbee9 | 1101 | blk_status_t error = bio->bi_status; |
6c23f0bd | 1102 | struct dm_target_io *tio = clone_to_tio(bio); |
6cbce280 MS |
1103 | struct dm_target *ti = tio->ti; |
1104 | dm_endio_fn endio = ti->type->end_io; | |
b35f8caa | 1105 | struct dm_io *io = tio->io; |
6cbce280 | 1106 | struct mapped_device *md = io->md; |
1da177e4 | 1107 | |
dddf3056 MS |
1108 | if (unlikely(error == BLK_STS_TARGET)) { |
1109 | if (bio_op(bio) == REQ_OP_DISCARD && | |
1110 | !bdev_max_discard_sectors(bio->bi_bdev)) | |
1111 | disable_discard(md); | |
1112 | else if (bio_op(bio) == REQ_OP_WRITE_ZEROES && | |
1113 | !bdev_write_zeroes_sectors(bio->bi_bdev)) | |
1114 | disable_write_zeroes(md); | |
ca522482 | 1115 | } |
415c79e1 | 1116 | |
dddf3056 | 1117 | if (static_branch_unlikely(&zoned_enabled) && |
edd1dbc8 | 1118 | unlikely(bdev_is_zoned(bio->bi_bdev))) |
dddf3056 MS |
1119 | dm_zone_endio(io, bio); |
1120 | ||
1be56909 | 1121 | if (endio) { |
6cbce280 | 1122 | int r = endio(ti, bio, &error); |
b30f1607 | 1123 | |
1be56909 CH |
1124 | switch (r) { |
1125 | case DM_ENDIO_REQUEUE: | |
442761fd MS |
1126 | if (static_branch_unlikely(&zoned_enabled)) { |
1127 | /* | |
1128 | * Requeuing writes to a sequential zone of a zoned | |
1129 | * target will break the sequential write pattern: | |
1130 | * fail such IO. | |
1131 | */ | |
1132 | if (WARN_ON_ONCE(dm_is_zone_write(md, bio))) | |
1133 | error = BLK_STS_IOERR; | |
1134 | else | |
1135 | error = BLK_STS_DM_REQUEUE; | |
1136 | } else | |
bf14e2b2 | 1137 | error = BLK_STS_DM_REQUEUE; |
df561f66 | 1138 | fallthrough; |
1be56909 CH |
1139 | case DM_ENDIO_DONE: |
1140 | break; | |
1141 | case DM_ENDIO_INCOMPLETE: | |
1142 | /* The target will handle the io */ | |
1143 | return; | |
1144 | default: | |
43e6c111 | 1145 | DMCRIT("unimplemented target endio return value: %d", r); |
1be56909 CH |
1146 | BUG(); |
1147 | } | |
1148 | } | |
1149 | ||
442761fd MS |
1150 | if (static_branch_unlikely(&swap_bios_enabled) && |
1151 | unlikely(swap_bios_limit(ti, bio))) | |
a666e5c0 | 1152 | up(&md->swap_bios_semaphore); |
a666e5c0 | 1153 | |
1d1068ce | 1154 | free_tio(bio); |
e2118b3c | 1155 | dm_io_dec_pending(io, error); |
1da177e4 LT |
1156 | } |
1157 | ||
56a67df7 MS |
1158 | /* |
1159 | * Return maximum size of I/O possible at the supplied sector up to the current | |
1160 | * target boundary. | |
1161 | */ | |
3720281d MS |
1162 | static inline sector_t max_io_len_target_boundary(struct dm_target *ti, |
1163 | sector_t target_offset) | |
56a67df7 | 1164 | { |
56a67df7 MS |
1165 | return ti->len - target_offset; |
1166 | } | |
1167 | ||
06961c48 | 1168 | static sector_t __max_io_len(struct dm_target *ti, sector_t sector, |
be04c14a MS |
1169 | unsigned int max_granularity, |
1170 | unsigned int max_sectors) | |
1da177e4 | 1171 | { |
3720281d MS |
1172 | sector_t target_offset = dm_target_offset(ti, sector); |
1173 | sector_t len = max_io_len_target_boundary(ti, target_offset); | |
1da177e4 LT |
1174 | |
1175 | /* | |
3ee16db3 MS |
1176 | * Does the target need to split IO even further? |
1177 | * - varied (per target) IO splitting is a tenet of DM; this | |
1178 | * explains why stacked chunk_sectors based splitting via | |
5a97806f | 1179 | * bio_split_to_limits() isn't possible here. |
1da177e4 | 1180 | */ |
06961c48 | 1181 | if (!max_granularity) |
c3949322 CH |
1182 | return len; |
1183 | return min_t(sector_t, len, | |
be04c14a | 1184 | min(max_sectors ? : queue_max_sectors(ti->table->md->queue), |
06961c48 MS |
1185 | blk_chunk_sectors_left(target_offset, max_granularity))); |
1186 | } | |
1187 | ||
1188 | static inline sector_t max_io_len(struct dm_target *ti, sector_t sector) | |
1189 | { | |
be04c14a | 1190 | return __max_io_len(ti, sector, ti->max_io_len, 0); |
1da177e4 LT |
1191 | } |
1192 | ||
542f9038 MS |
1193 | int dm_set_target_max_io_len(struct dm_target *ti, sector_t len) |
1194 | { | |
1195 | if (len > UINT_MAX) { | |
1196 | DMERR("Specified maximum size of target IO (%llu) exceeds limit (%u)", | |
1197 | (unsigned long long)len, UINT_MAX); | |
1198 | ti->error = "Maximum size of target IO is too large"; | |
1199 | return -EINVAL; | |
1200 | } | |
1201 | ||
75ae1936 | 1202 | ti->max_io_len = (uint32_t) len; |
542f9038 MS |
1203 | |
1204 | return 0; | |
1205 | } | |
1206 | EXPORT_SYMBOL_GPL(dm_set_target_max_io_len); | |
1207 | ||
f26c5719 | 1208 | static struct dm_target *dm_dax_get_live_target(struct mapped_device *md, |
3d97c829 MS |
1209 | sector_t sector, int *srcu_idx) |
1210 | __acquires(md->io_barrier) | |
545ed20e | 1211 | { |
545ed20e TK |
1212 | struct dm_table *map; |
1213 | struct dm_target *ti; | |
545ed20e | 1214 | |
f26c5719 | 1215 | map = dm_get_live_table(md, srcu_idx); |
545ed20e | 1216 | if (!map) |
f26c5719 | 1217 | return NULL; |
545ed20e TK |
1218 | |
1219 | ti = dm_table_find_target(map, sector); | |
123d87d5 | 1220 | if (!ti) |
f26c5719 | 1221 | return NULL; |
545ed20e | 1222 | |
f26c5719 DW |
1223 | return ti; |
1224 | } | |
545ed20e | 1225 | |
f26c5719 | 1226 | static long dm_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, |
e511c4a3 JC |
1227 | long nr_pages, enum dax_access_mode mode, void **kaddr, |
1228 | pfn_t *pfn) | |
f26c5719 DW |
1229 | { |
1230 | struct mapped_device *md = dax_get_private(dax_dev); | |
1231 | sector_t sector = pgoff * PAGE_SECTORS; | |
1232 | struct dm_target *ti; | |
1233 | long len, ret = -EIO; | |
1234 | int srcu_idx; | |
545ed20e | 1235 | |
f26c5719 | 1236 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); |
545ed20e | 1237 | |
f26c5719 DW |
1238 | if (!ti) |
1239 | goto out; | |
1240 | if (!ti->type->direct_access) | |
1241 | goto out; | |
3720281d | 1242 | len = max_io_len(ti, sector) / PAGE_SECTORS; |
f26c5719 DW |
1243 | if (len < 1) |
1244 | goto out; | |
1245 | nr_pages = min(len, nr_pages); | |
e511c4a3 | 1246 | ret = ti->type->direct_access(ti, pgoff, nr_pages, mode, kaddr, pfn); |
817bf402 | 1247 | |
f26c5719 | 1248 | out: |
545ed20e | 1249 | dm_put_live_table(md, srcu_idx); |
f26c5719 DW |
1250 | |
1251 | return ret; | |
545ed20e TK |
1252 | } |
1253 | ||
cdf6cdcd VG |
1254 | static int dm_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, |
1255 | size_t nr_pages) | |
1256 | { | |
1257 | struct mapped_device *md = dax_get_private(dax_dev); | |
1258 | sector_t sector = pgoff * PAGE_SECTORS; | |
1259 | struct dm_target *ti; | |
1260 | int ret = -EIO; | |
1261 | int srcu_idx; | |
1262 | ||
1263 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); | |
1264 | ||
1265 | if (!ti) | |
1266 | goto out; | |
1267 | if (WARN_ON(!ti->type->dax_zero_page_range)) { | |
1268 | /* | |
1269 | * ->zero_page_range() is mandatory dax operation. If we are | |
1270 | * here, something is wrong. | |
1271 | */ | |
cdf6cdcd VG |
1272 | goto out; |
1273 | } | |
1274 | ret = ti->type->dax_zero_page_range(ti, pgoff, nr_pages); | |
cdf6cdcd VG |
1275 | out: |
1276 | dm_put_live_table(md, srcu_idx); | |
1277 | ||
1278 | return ret; | |
1279 | } | |
1280 | ||
047218ec JC |
1281 | static size_t dm_dax_recovery_write(struct dax_device *dax_dev, pgoff_t pgoff, |
1282 | void *addr, size_t bytes, struct iov_iter *i) | |
1283 | { | |
1284 | struct mapped_device *md = dax_get_private(dax_dev); | |
1285 | sector_t sector = pgoff * PAGE_SECTORS; | |
1286 | struct dm_target *ti; | |
1287 | int srcu_idx; | |
1288 | long ret = 0; | |
1289 | ||
1290 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); | |
1291 | if (!ti || !ti->type->dax_recovery_write) | |
1292 | goto out; | |
1293 | ||
1294 | ret = ti->type->dax_recovery_write(ti, pgoff, addr, bytes, i); | |
1295 | out: | |
1296 | dm_put_live_table(md, srcu_idx); | |
1297 | return ret; | |
1298 | } | |
1299 | ||
1dd40c3e MP |
1300 | /* |
1301 | * A target may call dm_accept_partial_bio only from the map routine. It is | |
6842d264 | 1302 | * allowed for all bio types except REQ_PREFLUSH, REQ_OP_ZONE_* zone management |
e6fc9f62 MS |
1303 | * operations, REQ_OP_ZONE_APPEND (zone append writes) and any bio serviced by |
1304 | * __send_duplicate_bios(). | |
1dd40c3e MP |
1305 | * |
1306 | * dm_accept_partial_bio informs the dm that the target only wants to process | |
1307 | * additional n_sectors sectors of the bio and the rest of the data should be | |
1308 | * sent in a next bio. | |
1309 | * | |
1310 | * A diagram that explains the arithmetics: | |
1311 | * +--------------------+---------------+-------+ | |
1312 | * | 1 | 2 | 3 | | |
1313 | * +--------------------+---------------+-------+ | |
1314 | * | |
1315 | * <-------------- *tio->len_ptr ---------------> | |
bdb34759 | 1316 | * <----- bio_sectors -----> |
1dd40c3e MP |
1317 | * <-- n_sectors --> |
1318 | * | |
1319 | * Region 1 was already iterated over with bio_advance or similar function. | |
1320 | * (it may be empty if the target doesn't use bio_advance) | |
1321 | * Region 2 is the remaining bio size that the target wants to process. | |
1322 | * (it may be empty if region 1 is non-empty, although there is no reason | |
1323 | * to make it empty) | |
1324 | * The target requires that region 3 is to be sent in the next bio. | |
1325 | * | |
1326 | * If the target wants to receive multiple copies of the bio (via num_*bios, etc), | |
1327 | * the partially processed part (the sum of regions 1+2) must be the same for all | |
1328 | * copies of the bio. | |
1329 | */ | |
86a3238c | 1330 | void dm_accept_partial_bio(struct bio *bio, unsigned int n_sectors) |
1dd40c3e | 1331 | { |
6c23f0bd | 1332 | struct dm_target_io *tio = clone_to_tio(bio); |
8b211aac | 1333 | struct dm_io *io = tio->io; |
86a3238c | 1334 | unsigned int bio_sectors = bio_sectors(bio); |
6842d264 | 1335 | |
655f3aad | 1336 | BUG_ON(dm_tio_flagged(tio, DM_TIO_IS_DUPLICATE_BIO)); |
6842d264 DLM |
1337 | BUG_ON(op_is_zone_mgmt(bio_op(bio))); |
1338 | BUG_ON(bio_op(bio) == REQ_OP_ZONE_APPEND); | |
bdb34759 MS |
1339 | BUG_ON(bio_sectors > *tio->len_ptr); |
1340 | BUG_ON(n_sectors > bio_sectors); | |
6842d264 | 1341 | |
bdb34759 | 1342 | *tio->len_ptr -= bio_sectors - n_sectors; |
1dd40c3e | 1343 | bio->bi_iter.bi_size = n_sectors << SECTOR_SHIFT; |
7dd76d1f ML |
1344 | |
1345 | /* | |
1346 | * __split_and_process_bio() may have already saved mapped part | |
1347 | * for accounting but it is being reduced so update accordingly. | |
1348 | */ | |
8b211aac ML |
1349 | dm_io_set_flag(io, DM_IO_WAS_SPLIT); |
1350 | io->sectors = n_sectors; | |
1351 | io->sector_offset = bio_sectors(io->orig_bio); | |
1dd40c3e MP |
1352 | } |
1353 | EXPORT_SYMBOL_GPL(dm_accept_partial_bio); | |
1354 | ||
0fbb4d93 MS |
1355 | /* |
1356 | * @clone: clone bio that DM core passed to target's .map function | |
1357 | * @tgt_clone: clone of @clone bio that target needs submitted | |
0fbb4d93 MS |
1358 | * |
1359 | * Targets should use this interface to submit bios they take | |
1360 | * ownership of when returning DM_MAPIO_SUBMITTED. | |
1361 | * | |
1362 | * Target should also enable ti->accounts_remapped_io | |
1363 | */ | |
b7f8dff0 | 1364 | void dm_submit_bio_remap(struct bio *clone, struct bio *tgt_clone) |
0fbb4d93 MS |
1365 | { |
1366 | struct dm_target_io *tio = clone_to_tio(clone); | |
1367 | struct dm_io *io = tio->io; | |
1368 | ||
1369 | /* establish bio that will get submitted */ | |
1370 | if (!tgt_clone) | |
1371 | tgt_clone = clone; | |
1372 | ||
1373 | /* | |
1374 | * Account io->origin_bio to DM dev on behalf of target | |
1375 | * that took ownership of IO with DM_MAPIO_SUBMITTED. | |
1376 | */ | |
9d20653f | 1377 | dm_start_io_acct(io, clone); |
0fbb4d93 | 1378 | |
9d20653f | 1379 | trace_block_bio_remap(tgt_clone, disk_devt(io->md->disk), |
0fbb4d93 | 1380 | tio->old_sector); |
9d20653f | 1381 | submit_bio_noacct(tgt_clone); |
0fbb4d93 MS |
1382 | } |
1383 | EXPORT_SYMBOL_GPL(dm_submit_bio_remap); | |
1384 | ||
a666e5c0 MP |
1385 | static noinline void __set_swap_bios_limit(struct mapped_device *md, int latch) |
1386 | { | |
1387 | mutex_lock(&md->swap_bios_lock); | |
1388 | while (latch < md->swap_bios) { | |
1389 | cond_resched(); | |
1390 | down(&md->swap_bios_semaphore); | |
1391 | md->swap_bios--; | |
1392 | } | |
1393 | while (latch > md->swap_bios) { | |
1394 | cond_resched(); | |
1395 | up(&md->swap_bios_semaphore); | |
1396 | md->swap_bios++; | |
1397 | } | |
1398 | mutex_unlock(&md->swap_bios_lock); | |
1399 | } | |
1400 | ||
1561b396 | 1401 | static void __map_bio(struct bio *clone) |
1da177e4 | 1402 | { |
1561b396 | 1403 | struct dm_target_io *tio = clone_to_tio(clone); |
bd2a49b8 | 1404 | struct dm_target *ti = tio->ti; |
6cbce280 MS |
1405 | struct dm_io *io = tio->io; |
1406 | struct mapped_device *md = io->md; | |
1407 | int r; | |
1da177e4 | 1408 | |
1da177e4 | 1409 | clone->bi_end_io = clone_endio; |
1da177e4 LT |
1410 | |
1411 | /* | |
0fbb4d93 | 1412 | * Map the clone. |
1da177e4 | 1413 | */ |
743598f0 | 1414 | tio->old_sector = clone->bi_iter.bi_sector; |
d67a5f4b | 1415 | |
442761fd MS |
1416 | if (static_branch_unlikely(&swap_bios_enabled) && |
1417 | unlikely(swap_bios_limit(ti, clone))) { | |
a666e5c0 | 1418 | int latch = get_swap_bios(); |
b30f1607 | 1419 | |
a666e5c0 MP |
1420 | if (unlikely(latch != md->swap_bios)) |
1421 | __set_swap_bios_limit(md, latch); | |
1422 | down(&md->swap_bios_semaphore); | |
1423 | } | |
1424 | ||
442761fd MS |
1425 | if (static_branch_unlikely(&zoned_enabled)) { |
1426 | /* | |
1427 | * Check if the IO needs a special mapping due to zone append | |
1428 | * emulation on zoned target. In this case, dm_zone_map_bio() | |
1429 | * calls the target map operation. | |
1430 | */ | |
1431 | if (unlikely(dm_emulate_zone_append(md))) | |
1432 | r = dm_zone_map_bio(tio); | |
f1445032 MP |
1433 | else |
1434 | goto do_map; | |
1435 | } else { | |
1436 | do_map: | |
1437 | if (likely(ti->type->map == linear_map)) | |
1438 | r = linear_map(ti, clone); | |
1439 | else if (ti->type->map == stripe_map) | |
1440 | r = stripe_map(ti, clone); | |
442761fd MS |
1441 | else |
1442 | r = ti->type->map(ti, clone); | |
f1445032 | 1443 | } |
bb37d772 | 1444 | |
846785e6 CH |
1445 | switch (r) { |
1446 | case DM_MAPIO_SUBMITTED: | |
0fbb4d93 MS |
1447 | /* target has assumed ownership of this io */ |
1448 | if (!ti->accounts_remapped_io) | |
9d20653f | 1449 | dm_start_io_acct(io, clone); |
846785e6 CH |
1450 | break; |
1451 | case DM_MAPIO_REMAPPED: | |
9d20653f | 1452 | dm_submit_bio_remap(clone, NULL); |
846785e6 CH |
1453 | break; |
1454 | case DM_MAPIO_KILL: | |
846785e6 | 1455 | case DM_MAPIO_REQUEUE: |
442761fd MS |
1456 | if (static_branch_unlikely(&swap_bios_enabled) && |
1457 | unlikely(swap_bios_limit(ti, clone))) | |
6cbce280 | 1458 | up(&md->swap_bios_semaphore); |
1d1068ce | 1459 | free_tio(clone); |
90a2326e MS |
1460 | if (r == DM_MAPIO_KILL) |
1461 | dm_io_dec_pending(io, BLK_STS_IOERR); | |
1462 | else | |
1463 | dm_io_dec_pending(io, BLK_STS_DM_REQUEUE); | |
846785e6 CH |
1464 | break; |
1465 | default: | |
43e6c111 | 1466 | DMCRIT("unimplemented target map return value: %d", r); |
45cbcd79 | 1467 | BUG(); |
1da177e4 LT |
1468 | } |
1469 | } | |
1da177e4 | 1470 | |
86a3238c | 1471 | static void setup_split_accounting(struct clone_info *ci, unsigned int len) |
7dd76d1f ML |
1472 | { |
1473 | struct dm_io *io = ci->io; | |
1474 | ||
1475 | if (ci->sector_count > len) { | |
1476 | /* | |
1477 | * Split needed, save the mapped part for accounting. | |
1478 | * NOTE: dm_accept_partial_bio() will update accordingly. | |
1479 | */ | |
1480 | dm_io_set_flag(io, DM_IO_WAS_SPLIT); | |
1481 | io->sectors = len; | |
8b211aac | 1482 | io->sector_offset = bio_sectors(ci->bio); |
7dd76d1f ML |
1483 | } |
1484 | } | |
1485 | ||
318716dd | 1486 | static void alloc_multiple_bios(struct bio_list *blist, struct clone_info *ci, |
f7b58a69 | 1487 | struct dm_target *ti, unsigned int num_bios, |
4a2fe296 | 1488 | unsigned *len, gfp_t gfp_flag) |
f9ab94ce | 1489 | { |
1d1068ce | 1490 | struct bio *bio; |
4a2fe296 | 1491 | int try = (gfp_flag & GFP_NOWAIT) ? 0 : 1; |
dba14160 | 1492 | |
4a2fe296 | 1493 | for (; try < 2; try++) { |
318716dd | 1494 | int bio_nr; |
318716dd | 1495 | |
4a2fe296 | 1496 | if (try && num_bios > 1) |
bc02cdbe | 1497 | mutex_lock(&ci->io->md->table_devices_lock); |
318716dd | 1498 | for (bio_nr = 0; bio_nr < num_bios; bio_nr++) { |
f7b58a69 | 1499 | bio = alloc_tio(ci, ti, bio_nr, len, |
dc8e2021 | 1500 | try ? GFP_NOIO : GFP_NOWAIT); |
1d1068ce | 1501 | if (!bio) |
318716dd MS |
1502 | break; |
1503 | ||
1d1068ce | 1504 | bio_list_add(blist, bio); |
318716dd | 1505 | } |
4a2fe296 | 1506 | if (try && num_bios > 1) |
bc02cdbe | 1507 | mutex_unlock(&ci->io->md->table_devices_lock); |
318716dd MS |
1508 | if (bio_nr == num_bios) |
1509 | return; | |
1510 | ||
6c23f0bd | 1511 | while ((bio = bio_list_pop(blist))) |
1d1068ce | 1512 | free_tio(bio); |
318716dd | 1513 | } |
9015df24 AK |
1514 | } |
1515 | ||
34dbaa88 | 1516 | static unsigned int __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti, |
4a2fe296 MS |
1517 | unsigned int num_bios, unsigned int *len, |
1518 | gfp_t gfp_flag) | |
06a426ce | 1519 | { |
318716dd | 1520 | struct bio_list blist = BIO_EMPTY_LIST; |
8eabf5d0 | 1521 | struct bio *clone; |
564b5c54 | 1522 | unsigned int ret = 0; |
06a426ce | 1523 | |
4a2fe296 MS |
1524 | if (WARN_ON_ONCE(num_bios == 0)) /* num_bios = 0 is a bug in caller */ |
1525 | return 0; | |
1526 | ||
1527 | /* dm_accept_partial_bio() is not supported with shared tio->len_ptr */ | |
1528 | if (len) | |
1529 | setup_split_accounting(ci, *len); | |
1530 | ||
1531 | /* | |
1532 | * Using alloc_multiple_bios(), even if num_bios is 1, to consistently | |
1533 | * support allocating using GFP_NOWAIT with GFP_NOIO fallback. | |
1534 | */ | |
1535 | alloc_multiple_bios(&blist, ci, ti, num_bios, len, gfp_flag); | |
1536 | while ((clone = bio_list_pop(&blist))) { | |
1537 | if (num_bios > 1) | |
655f3aad | 1538 | dm_tio_set_flag(clone_to_tio(clone), DM_TIO_IS_DUPLICATE_BIO); |
4a2fe296 MS |
1539 | __map_bio(clone); |
1540 | ret += 1; | |
318716dd | 1541 | } |
0f14d60a ML |
1542 | |
1543 | return ret; | |
06a426ce MS |
1544 | } |
1545 | ||
332f2b1e | 1546 | static void __send_empty_flush(struct clone_info *ci) |
f9ab94ce | 1547 | { |
564b5c54 | 1548 | struct dm_table *t = ci->map; |
828678b8 MS |
1549 | struct bio flush_bio; |
1550 | ||
1551 | /* | |
1552 | * Use an on-stack bio for this, it's safe since we don't | |
1553 | * need to reference it after submit. It's just used as | |
1554 | * the basis for the clone(s). | |
1555 | */ | |
49add496 CH |
1556 | bio_init(&flush_bio, ci->io->md->disk->part0, NULL, 0, |
1557 | REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC); | |
47d95102 | 1558 | |
828678b8 MS |
1559 | ci->bio = &flush_bio; |
1560 | ci->sector_count = 0; | |
92b914e2 | 1561 | ci->io->tio.clone.bi_iter.bi_size = 0; |
f9ab94ce | 1562 | |
564b5c54 MS |
1563 | for (unsigned int i = 0; i < t->num_targets; i++) { |
1564 | unsigned int bios; | |
1565 | struct dm_target *ti = dm_table_get_target(t, i); | |
0f14d60a | 1566 | |
4a2fe296 MS |
1567 | if (unlikely(ti->num_flush_bios == 0)) |
1568 | continue; | |
1569 | ||
0f14d60a | 1570 | atomic_add(ti->num_flush_bios, &ci->io->io_count); |
4a2fe296 MS |
1571 | bios = __send_duplicate_bios(ci, ti, ti->num_flush_bios, |
1572 | NULL, GFP_NOWAIT); | |
0f14d60a ML |
1573 | atomic_sub(ti->num_flush_bios - bios, &ci->io->io_count); |
1574 | } | |
1575 | ||
1576 | /* | |
1577 | * alloc_io() takes one extra reference for submission, so the | |
1578 | * reference won't reach 0 without the following subtraction | |
1579 | */ | |
1580 | atomic_sub(1, &ci->io->io_count); | |
828678b8 MS |
1581 | |
1582 | bio_uninit(ci->bio); | |
f9ab94ce MP |
1583 | } |
1584 | ||
4a2fe296 MS |
1585 | static void __send_abnormal_io(struct clone_info *ci, struct dm_target *ti, |
1586 | unsigned int num_bios, unsigned int max_granularity, | |
1587 | unsigned int max_sectors) | |
ba1cbad9 | 1588 | { |
86a3238c | 1589 | unsigned int len, bios; |
ba1cbad9 | 1590 | |
3720281d | 1591 | len = min_t(sector_t, ci->sector_count, |
be04c14a | 1592 | __max_io_len(ti, ci->sector, max_granularity, max_sectors)); |
51b86f9a | 1593 | |
0f14d60a | 1594 | atomic_add(num_bios, &ci->io->io_count); |
4a2fe296 | 1595 | bios = __send_duplicate_bios(ci, ti, num_bios, &len, GFP_NOIO); |
0f14d60a ML |
1596 | /* |
1597 | * alloc_io() takes one extra reference for submission, so the | |
1598 | * reference won't reach 0 without the following (+1) subtraction | |
1599 | */ | |
1600 | atomic_sub(num_bios - bios + 1, &ci->io->io_count); | |
7dd06a25 | 1601 | |
3d7f4562 MS |
1602 | ci->sector += len; |
1603 | ci->sector_count -= len; | |
ba1cbad9 MS |
1604 | } |
1605 | ||
568c73a3 MS |
1606 | static bool is_abnormal_io(struct bio *bio) |
1607 | { | |
a3282b43 | 1608 | enum req_op op = bio_op(bio); |
568c73a3 | 1609 | |
4edadf6d MS |
1610 | if (op != REQ_OP_READ && op != REQ_OP_WRITE && op != REQ_OP_FLUSH) { |
1611 | switch (op) { | |
1612 | case REQ_OP_DISCARD: | |
1613 | case REQ_OP_SECURE_ERASE: | |
1614 | case REQ_OP_WRITE_ZEROES: | |
1615 | return true; | |
1616 | default: | |
1617 | break; | |
1618 | } | |
568c73a3 MS |
1619 | } |
1620 | ||
4edadf6d | 1621 | return false; |
568c73a3 MS |
1622 | } |
1623 | ||
4edadf6d MS |
1624 | static blk_status_t __process_abnormal_io(struct clone_info *ci, |
1625 | struct dm_target *ti) | |
0519c71e | 1626 | { |
86a3238c | 1627 | unsigned int num_bios = 0; |
06961c48 | 1628 | unsigned int max_granularity = 0; |
be04c14a | 1629 | unsigned int max_sectors = 0; |
13f6facf | 1630 | struct queue_limits *limits = dm_get_queue_limits(ti->table->md); |
0519c71e | 1631 | |
e6fc9f62 | 1632 | switch (bio_op(ci->bio)) { |
9679b5a7 MS |
1633 | case REQ_OP_DISCARD: |
1634 | num_bios = ti->num_discard_bios; | |
be04c14a | 1635 | max_sectors = limits->max_discard_sectors; |
13f6facf | 1636 | if (ti->max_discard_granularity) |
be04c14a | 1637 | max_granularity = max_sectors; |
9679b5a7 MS |
1638 | break; |
1639 | case REQ_OP_SECURE_ERASE: | |
1640 | num_bios = ti->num_secure_erase_bios; | |
be04c14a | 1641 | max_sectors = limits->max_secure_erase_sectors; |
13f6facf | 1642 | if (ti->max_secure_erase_granularity) |
be04c14a | 1643 | max_granularity = max_sectors; |
9679b5a7 | 1644 | break; |
9679b5a7 MS |
1645 | case REQ_OP_WRITE_ZEROES: |
1646 | num_bios = ti->num_write_zeroes_bios; | |
be04c14a | 1647 | max_sectors = limits->max_write_zeroes_sectors; |
13f6facf | 1648 | if (ti->max_write_zeroes_granularity) |
be04c14a | 1649 | max_granularity = max_sectors; |
9679b5a7 | 1650 | break; |
2d9b02be BVA |
1651 | default: |
1652 | break; | |
9679b5a7 | 1653 | } |
0519c71e | 1654 | |
e6fc9f62 MS |
1655 | /* |
1656 | * Even though the device advertised support for this type of | |
1657 | * request, that does not mean every target supports it, and | |
1658 | * reconfiguration might also have changed that since the | |
1659 | * check was performed. | |
1660 | */ | |
84b98f4c | 1661 | if (unlikely(!num_bios)) |
4edadf6d MS |
1662 | return BLK_STS_NOTSUPP; |
1663 | ||
4a2fe296 MS |
1664 | __send_abnormal_io(ci, ti, num_bios, max_granularity, max_sectors); |
1665 | ||
4edadf6d | 1666 | return BLK_STS_OK; |
0519c71e MS |
1667 | } |
1668 | ||
b99fdcdc | 1669 | /* |
ec211631 | 1670 | * Reuse ->bi_private as dm_io list head for storing all dm_io instances |
b99fdcdc ML |
1671 | * associated with this bio, and this bio's bi_private needs to be |
1672 | * stored in dm_io->data before the reuse. | |
1673 | * | |
1674 | * bio->bi_private is owned by fs or upper layer, so block layer won't | |
1675 | * touch it after splitting. Meantime it won't be changed by anyone after | |
1676 | * bio is submitted. So this reuse is safe. | |
1677 | */ | |
ec211631 | 1678 | static inline struct dm_io **dm_poll_list_head(struct bio *bio) |
b99fdcdc | 1679 | { |
ec211631 | 1680 | return (struct dm_io **)&bio->bi_private; |
b99fdcdc ML |
1681 | } |
1682 | ||
1683 | static void dm_queue_poll_io(struct bio *bio, struct dm_io *io) | |
1684 | { | |
ec211631 | 1685 | struct dm_io **head = dm_poll_list_head(bio); |
b99fdcdc ML |
1686 | |
1687 | if (!(bio->bi_opf & REQ_DM_POLL_LIST)) { | |
1688 | bio->bi_opf |= REQ_DM_POLL_LIST; | |
1689 | /* | |
1690 | * Save .bi_private into dm_io, so that we can reuse | |
ec211631 | 1691 | * .bi_private as dm_io list head for storing dm_io list |
b99fdcdc ML |
1692 | */ |
1693 | io->data = bio->bi_private; | |
1694 | ||
b99fdcdc ML |
1695 | /* tell block layer to poll for completion */ |
1696 | bio->bi_cookie = ~BLK_QC_T_NONE; | |
ec211631 ML |
1697 | |
1698 | io->next = NULL; | |
b99fdcdc ML |
1699 | } else { |
1700 | /* | |
1701 | * bio recursed due to split, reuse original poll list, | |
1702 | * and save bio->bi_private too. | |
1703 | */ | |
ec211631 ML |
1704 | io->data = (*head)->data; |
1705 | io->next = *head; | |
b99fdcdc ML |
1706 | } |
1707 | ||
ec211631 | 1708 | *head = io; |
b99fdcdc ML |
1709 | } |
1710 | ||
e4c93811 AK |
1711 | /* |
1712 | * Select the correct strategy for processing a non-flush bio. | |
1713 | */ | |
84b98f4c | 1714 | static blk_status_t __split_and_process_bio(struct clone_info *ci) |
0ce65797 | 1715 | { |
66bdaa43 | 1716 | struct bio *clone; |
512875bd | 1717 | struct dm_target *ti; |
86a3238c | 1718 | unsigned int len; |
0ce65797 | 1719 | |
512875bd | 1720 | ti = dm_table_find_target(ci->map, ci->sector); |
4edadf6d MS |
1721 | if (unlikely(!ti)) |
1722 | return BLK_STS_IOERR; | |
1ee88de3 | 1723 | |
1ee88de3 | 1724 | if (unlikely(ci->is_abnormal_io)) |
4edadf6d | 1725 | return __process_abnormal_io(ci, ti); |
3d7f4562 | 1726 | |
b99fdcdc ML |
1727 | /* |
1728 | * Only support bio polling for normal IO, and the target io is | |
1729 | * exactly inside the dm_io instance (verified in dm_poll_dm_io) | |
1730 | */ | |
a3282b43 | 1731 | ci->submit_as_polled = !!(ci->bio->bi_opf & REQ_POLLED); |
0ce65797 | 1732 | |
3720281d | 1733 | len = min_t(sector_t, max_io_len(ti, ci->sector), ci->sector_count); |
7dd76d1f | 1734 | setup_split_accounting(ci, len); |
6f25dd1c MS |
1735 | |
1736 | if (unlikely(ci->bio->bi_opf & REQ_NOWAIT)) { | |
1737 | if (unlikely(!dm_target_supports_nowait(ti->type))) | |
1738 | return BLK_STS_NOTSUPP; | |
1739 | ||
1740 | clone = alloc_tio(ci, ti, 0, &len, GFP_NOWAIT); | |
1741 | if (unlikely(!clone)) | |
1742 | return BLK_STS_AGAIN; | |
1743 | } else { | |
1744 | clone = alloc_tio(ci, ti, 0, &len, GFP_NOIO); | |
1745 | } | |
66bdaa43 | 1746 | __map_bio(clone); |
0ce65797 | 1747 | |
1c3b13e6 KO |
1748 | ci->sector += len; |
1749 | ci->sector_count -= len; | |
0ce65797 | 1750 | |
84b98f4c | 1751 | return BLK_STS_OK; |
0ce65797 MS |
1752 | } |
1753 | ||
6f25dd1c | 1754 | static void init_clone_info(struct clone_info *ci, struct dm_io *io, |
4edadf6d | 1755 | struct dm_table *map, struct bio *bio, bool is_abnormal) |
978e51ba MS |
1756 | { |
1757 | ci->map = map; | |
6f25dd1c | 1758 | ci->io = io; |
d41e077a | 1759 | ci->bio = bio; |
4edadf6d | 1760 | ci->is_abnormal_io = is_abnormal; |
b99fdcdc | 1761 | ci->submit_as_polled = false; |
978e51ba | 1762 | ci->sector = bio->bi_iter.bi_sector; |
d41e077a MS |
1763 | ci->sector_count = bio_sectors(bio); |
1764 | ||
1765 | /* Shouldn't happen but sector_count was being set to 0 so... */ | |
442761fd MS |
1766 | if (static_branch_unlikely(&zoned_enabled) && |
1767 | WARN_ON_ONCE(op_is_zone_mgmt(bio_op(bio)) && ci->sector_count)) | |
d41e077a | 1768 | ci->sector_count = 0; |
978e51ba MS |
1769 | } |
1770 | ||
1da177e4 | 1771 | /* |
14fe594d | 1772 | * Entry point to split a bio into clones and submit them to the targets. |
1da177e4 | 1773 | */ |
96c9865c MS |
1774 | static void dm_split_and_process_bio(struct mapped_device *md, |
1775 | struct dm_table *map, struct bio *bio) | |
0ce65797 | 1776 | { |
1da177e4 | 1777 | struct clone_info ci; |
4857abf6 | 1778 | struct dm_io *io; |
84b98f4c | 1779 | blk_status_t error = BLK_STS_OK; |
4edadf6d MS |
1780 | bool is_abnormal; |
1781 | ||
1782 | is_abnormal = is_abnormal_io(bio); | |
1783 | if (unlikely(is_abnormal)) { | |
1784 | /* | |
5a97806f | 1785 | * Use bio_split_to_limits() for abnormal IO (e.g. discard, etc) |
4edadf6d MS |
1786 | * otherwise associated queue_limits won't be imposed. |
1787 | */ | |
5a97806f | 1788 | bio = bio_split_to_limits(bio); |
613b1488 JA |
1789 | if (!bio) |
1790 | return; | |
4edadf6d | 1791 | } |
1da177e4 | 1792 | |
6f25dd1c MS |
1793 | /* Only support nowait for normal IO */ |
1794 | if (unlikely(bio->bi_opf & REQ_NOWAIT) && !is_abnormal) { | |
1795 | io = alloc_io(md, bio, GFP_NOWAIT); | |
1796 | if (unlikely(!io)) { | |
1797 | /* Unable to do anything without dm_io. */ | |
1798 | bio_wouldblock_error(bio); | |
1799 | return; | |
1800 | } | |
1801 | } else { | |
1802 | io = alloc_io(md, bio, GFP_NOIO); | |
1803 | } | |
1804 | init_clone_info(&ci, io, map, bio, is_abnormal); | |
0ce65797 | 1805 | |
1eff9d32 | 1806 | if (bio->bi_opf & REQ_PREFLUSH) { |
332f2b1e | 1807 | __send_empty_flush(&ci); |
e2736347 | 1808 | /* dm_io_complete submits any data associated with flush */ |
d41e077a | 1809 | goto out; |
d87f4c14 | 1810 | } |
0ce65797 | 1811 | |
d41e077a MS |
1812 | error = __split_and_process_bio(&ci); |
1813 | if (error || !ci.sector_count) | |
1814 | goto out; | |
d41e077a MS |
1815 | /* |
1816 | * Remainder must be passed to submit_bio_noacct() so it gets handled | |
1817 | * *after* bios already submitted have been completely processed. | |
d41e077a | 1818 | */ |
8b211aac ML |
1819 | bio_trim(bio, io->sectors, ci.sector_count); |
1820 | trace_block_split(bio, bio->bi_iter.bi_sector); | |
1821 | bio_inc_remaining(bio); | |
d41e077a MS |
1822 | submit_bio_noacct(bio); |
1823 | out: | |
b99fdcdc ML |
1824 | /* |
1825 | * Drop the extra reference count for non-POLLED bio, and hold one | |
1826 | * reference for POLLED bio, which will be released in dm_poll_bio | |
1827 | * | |
ec211631 ML |
1828 | * Add every dm_io instance into the dm_io list head which is stored |
1829 | * in bio->bi_private, so that dm_poll_bio can poll them all. | |
b99fdcdc | 1830 | */ |
0f14d60a ML |
1831 | if (error || !ci.submit_as_polled) { |
1832 | /* | |
1833 | * In case of submission failure, the extra reference for | |
1834 | * submitting io isn't consumed yet | |
1835 | */ | |
1836 | if (error) | |
1837 | atomic_dec(&io->io_count); | |
1838 | dm_io_dec_pending(io, error); | |
1839 | } else | |
4857abf6 | 1840 | dm_queue_poll_io(bio, io); |
0ce65797 MS |
1841 | } |
1842 | ||
3e08773c | 1843 | static void dm_submit_bio(struct bio *bio) |
cec47e3d | 1844 | { |
309dca30 | 1845 | struct mapped_device *md = bio->bi_bdev->bd_disk->private_data; |
83d5e5b0 MP |
1846 | int srcu_idx; |
1847 | struct dm_table *map; | |
cec47e3d | 1848 | |
a9ce3853 | 1849 | map = dm_get_live_table(md, &srcu_idx); |
29e4013d | 1850 | |
fa247089 MS |
1851 | /* If suspended, or map not yet available, queue this IO for later */ |
1852 | if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) || | |
1853 | unlikely(!map)) { | |
6abc4946 KK |
1854 | if (bio->bi_opf & REQ_NOWAIT) |
1855 | bio_wouldblock_error(bio); | |
b2abdb1b | 1856 | else if (bio->bi_opf & REQ_RAHEAD) |
54d9a1b4 | 1857 | bio_io_error(bio); |
b2abdb1b MS |
1858 | else |
1859 | queue_io(md, bio); | |
1860 | goto out; | |
cec47e3d | 1861 | } |
1da177e4 | 1862 | |
96c9865c | 1863 | dm_split_and_process_bio(md, map, bio); |
b2abdb1b | 1864 | out: |
a9ce3853 | 1865 | dm_put_live_table(md, srcu_idx); |
978e51ba MS |
1866 | } |
1867 | ||
b99fdcdc ML |
1868 | static bool dm_poll_dm_io(struct dm_io *io, struct io_comp_batch *iob, |
1869 | unsigned int flags) | |
1870 | { | |
655f3aad | 1871 | WARN_ON_ONCE(!dm_tio_is_normal(&io->tio)); |
b99fdcdc ML |
1872 | |
1873 | /* don't poll if the mapped io is done */ | |
1874 | if (atomic_read(&io->io_count) > 1) | |
1875 | bio_poll(&io->tio.clone, iob, flags); | |
1876 | ||
1877 | /* bio_poll holds the last reference */ | |
1878 | return atomic_read(&io->io_count) == 1; | |
1879 | } | |
1880 | ||
1881 | static int dm_poll_bio(struct bio *bio, struct io_comp_batch *iob, | |
1882 | unsigned int flags) | |
1883 | { | |
ec211631 ML |
1884 | struct dm_io **head = dm_poll_list_head(bio); |
1885 | struct dm_io *list = *head; | |
1886 | struct dm_io *tmp = NULL; | |
1887 | struct dm_io *curr, *next; | |
b99fdcdc ML |
1888 | |
1889 | /* Only poll normal bio which was marked as REQ_DM_POLL_LIST */ | |
1890 | if (!(bio->bi_opf & REQ_DM_POLL_LIST)) | |
1891 | return 0; | |
1892 | ||
ec211631 | 1893 | WARN_ON_ONCE(!list); |
b99fdcdc ML |
1894 | |
1895 | /* | |
1896 | * Restore .bi_private before possibly completing dm_io. | |
1897 | * | |
1898 | * bio_poll() is only possible once @bio has been completely | |
1899 | * submitted via submit_bio_noacct()'s depth-first submission. | |
1900 | * So there is no dm_queue_poll_io() race associated with | |
1901 | * clearing REQ_DM_POLL_LIST here. | |
1902 | */ | |
1903 | bio->bi_opf &= ~REQ_DM_POLL_LIST; | |
ec211631 | 1904 | bio->bi_private = list->data; |
b99fdcdc | 1905 | |
ec211631 ML |
1906 | for (curr = list, next = curr->next; curr; curr = next, next = |
1907 | curr ? curr->next : NULL) { | |
1908 | if (dm_poll_dm_io(curr, iob, flags)) { | |
b99fdcdc | 1909 | /* |
84b98f4c MS |
1910 | * clone_endio() has already occurred, so no |
1911 | * error handling is needed here. | |
b99fdcdc | 1912 | */ |
ec211631 ML |
1913 | __dm_io_dec_pending(curr); |
1914 | } else { | |
1915 | curr->next = tmp; | |
1916 | tmp = curr; | |
b99fdcdc ML |
1917 | } |
1918 | } | |
1919 | ||
1920 | /* Not done? */ | |
ec211631 | 1921 | if (tmp) { |
b99fdcdc ML |
1922 | bio->bi_opf |= REQ_DM_POLL_LIST; |
1923 | /* Reset bio->bi_private to dm_io list head */ | |
ec211631 | 1924 | *head = tmp; |
b99fdcdc ML |
1925 | return 0; |
1926 | } | |
1927 | return 1; | |
1928 | } | |
1929 | ||
a4a82ce3 HM |
1930 | /* |
1931 | *--------------------------------------------------------------- | |
1da177e4 | 1932 | * An IDR is used to keep track of allocated minor numbers. |
a4a82ce3 HM |
1933 | *--------------------------------------------------------------- |
1934 | */ | |
2b06cfff | 1935 | static void free_minor(int minor) |
1da177e4 | 1936 | { |
f32c10b0 | 1937 | spin_lock(&_minor_lock); |
1da177e4 | 1938 | idr_remove(&_minor_idr, minor); |
f32c10b0 | 1939 | spin_unlock(&_minor_lock); |
1da177e4 LT |
1940 | } |
1941 | ||
1942 | /* | |
1943 | * See if the device with a specific minor # is free. | |
1944 | */ | |
cf13ab8e | 1945 | static int specific_minor(int minor) |
1da177e4 | 1946 | { |
c9d76be6 | 1947 | int r; |
1da177e4 LT |
1948 | |
1949 | if (minor >= (1 << MINORBITS)) | |
1950 | return -EINVAL; | |
1951 | ||
c9d76be6 | 1952 | idr_preload(GFP_KERNEL); |
f32c10b0 | 1953 | spin_lock(&_minor_lock); |
1da177e4 | 1954 | |
c9d76be6 | 1955 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, minor, minor + 1, GFP_NOWAIT); |
1da177e4 | 1956 | |
f32c10b0 | 1957 | spin_unlock(&_minor_lock); |
c9d76be6 TH |
1958 | idr_preload_end(); |
1959 | if (r < 0) | |
1960 | return r == -ENOSPC ? -EBUSY : r; | |
1961 | return 0; | |
1da177e4 LT |
1962 | } |
1963 | ||
cf13ab8e | 1964 | static int next_free_minor(int *minor) |
1da177e4 | 1965 | { |
c9d76be6 | 1966 | int r; |
62f75c2f | 1967 | |
c9d76be6 | 1968 | idr_preload(GFP_KERNEL); |
f32c10b0 | 1969 | spin_lock(&_minor_lock); |
1da177e4 | 1970 | |
c9d76be6 | 1971 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, 0, 1 << MINORBITS, GFP_NOWAIT); |
1da177e4 | 1972 | |
f32c10b0 | 1973 | spin_unlock(&_minor_lock); |
c9d76be6 TH |
1974 | idr_preload_end(); |
1975 | if (r < 0) | |
1976 | return r; | |
1977 | *minor = r; | |
1978 | return 0; | |
1da177e4 LT |
1979 | } |
1980 | ||
83d5cde4 | 1981 | static const struct block_device_operations dm_blk_dops; |
681cc5e8 | 1982 | static const struct block_device_operations dm_rq_blk_dops; |
f26c5719 | 1983 | static const struct dax_operations dm_dax_ops; |
1da177e4 | 1984 | |
53d5914f MP |
1985 | static void dm_wq_work(struct work_struct *work); |
1986 | ||
aa6ce87a | 1987 | #ifdef CONFIG_BLK_INLINE_ENCRYPTION |
cb77cb5a | 1988 | static void dm_queue_destroy_crypto_profile(struct request_queue *q) |
aa6ce87a | 1989 | { |
cb77cb5a | 1990 | dm_destroy_crypto_profile(q->crypto_profile); |
aa6ce87a ST |
1991 | } |
1992 | ||
1993 | #else /* CONFIG_BLK_INLINE_ENCRYPTION */ | |
1994 | ||
cb77cb5a | 1995 | static inline void dm_queue_destroy_crypto_profile(struct request_queue *q) |
aa6ce87a ST |
1996 | { |
1997 | } | |
1998 | #endif /* !CONFIG_BLK_INLINE_ENCRYPTION */ | |
1999 | ||
0f20972f MS |
2000 | static void cleanup_mapped_device(struct mapped_device *md) |
2001 | { | |
0f20972f MS |
2002 | if (md->wq) |
2003 | destroy_workqueue(md->wq); | |
29dec90a | 2004 | dm_free_md_mempools(md->mempools); |
0f20972f | 2005 | |
f26c5719 | 2006 | if (md->dax_dev) { |
fb08a190 | 2007 | dax_remove_host(md->disk); |
f26c5719 DW |
2008 | kill_dax(md->dax_dev); |
2009 | put_dax(md->dax_dev); | |
2010 | md->dax_dev = NULL; | |
2011 | } | |
2012 | ||
588b7f5d | 2013 | dm_cleanup_zoned_dev(md); |
0f20972f MS |
2014 | if (md->disk) { |
2015 | spin_lock(&_minor_lock); | |
2016 | md->disk->private_data = NULL; | |
2017 | spin_unlock(&_minor_lock); | |
89f871af | 2018 | if (dm_get_md_type(md) != DM_TYPE_NONE) { |
1a581b72 CH |
2019 | struct table_device *td; |
2020 | ||
89f871af | 2021 | dm_sysfs_exit(md); |
1a581b72 CH |
2022 | list_for_each_entry(td, &md->table_devices, list) { |
2023 | bd_unlink_disk_holder(td->dm_dev.bdev, | |
2024 | md->disk); | |
2025 | } | |
d563792c YK |
2026 | |
2027 | /* | |
2028 | * Hold lock to make sure del_gendisk() won't concurrent | |
2029 | * with open/close_table_device(). | |
2030 | */ | |
2031 | mutex_lock(&md->table_devices_lock); | |
89f871af | 2032 | del_gendisk(md->disk); |
d563792c | 2033 | mutex_unlock(&md->table_devices_lock); |
89f871af | 2034 | } |
cb77cb5a | 2035 | dm_queue_destroy_crypto_profile(md->queue); |
8b9ab626 | 2036 | put_disk(md->disk); |
74a2b6ec | 2037 | } |
0f20972f | 2038 | |
9f6dc633 MS |
2039 | if (md->pending_io) { |
2040 | free_percpu(md->pending_io); | |
2041 | md->pending_io = NULL; | |
2042 | } | |
2043 | ||
d09960b0 TE |
2044 | cleanup_srcu_struct(&md->io_barrier); |
2045 | ||
d5ffebdd MS |
2046 | mutex_destroy(&md->suspend_lock); |
2047 | mutex_destroy(&md->type_lock); | |
2048 | mutex_destroy(&md->table_devices_lock); | |
a666e5c0 | 2049 | mutex_destroy(&md->swap_bios_lock); |
d5ffebdd | 2050 | |
4cc96131 | 2051 | dm_mq_cleanup_mapped_device(md); |
0f20972f MS |
2052 | } |
2053 | ||
1da177e4 LT |
2054 | /* |
2055 | * Allocate and initialise a blank device with a given minor. | |
2056 | */ | |
2b06cfff | 2057 | static struct mapped_device *alloc_dev(int minor) |
1da177e4 | 2058 | { |
115485e8 | 2059 | int r, numa_node_id = dm_get_numa_node(); |
c2929072 | 2060 | struct dax_device *dax_dev; |
115485e8 | 2061 | struct mapped_device *md; |
ba61fdd1 | 2062 | void *old_md; |
1da177e4 | 2063 | |
856eb091 | 2064 | md = kvzalloc_node(sizeof(*md), GFP_KERNEL, numa_node_id); |
1da177e4 | 2065 | if (!md) { |
43e6c111 | 2066 | DMERR("unable to allocate device, out of memory."); |
1da177e4 LT |
2067 | return NULL; |
2068 | } | |
2069 | ||
10da4f79 | 2070 | if (!try_module_get(THIS_MODULE)) |
6ed7ade8 | 2071 | goto bad_module_get; |
10da4f79 | 2072 | |
1da177e4 | 2073 | /* get a minor number for the dev */ |
2b06cfff | 2074 | if (minor == DM_ANY_MINOR) |
cf13ab8e | 2075 | r = next_free_minor(&minor); |
2b06cfff | 2076 | else |
cf13ab8e | 2077 | r = specific_minor(minor); |
1da177e4 | 2078 | if (r < 0) |
6ed7ade8 | 2079 | goto bad_minor; |
1da177e4 | 2080 | |
83d5e5b0 MP |
2081 | r = init_srcu_struct(&md->io_barrier); |
2082 | if (r < 0) | |
2083 | goto bad_io_barrier; | |
2084 | ||
115485e8 | 2085 | md->numa_node_id = numa_node_id; |
591ddcfc | 2086 | md->init_tio_pdu = false; |
a5664dad | 2087 | md->type = DM_TYPE_NONE; |
e61290a4 | 2088 | mutex_init(&md->suspend_lock); |
a5664dad | 2089 | mutex_init(&md->type_lock); |
86f1152b | 2090 | mutex_init(&md->table_devices_lock); |
022c2611 | 2091 | spin_lock_init(&md->deferred_lock); |
1da177e4 | 2092 | atomic_set(&md->holders, 1); |
5c6bd75d | 2093 | atomic_set(&md->open_count, 0); |
1da177e4 | 2094 | atomic_set(&md->event_nr, 0); |
7a8c3d3b MA |
2095 | atomic_set(&md->uevent_seq, 0); |
2096 | INIT_LIST_HEAD(&md->uevent_list); | |
86f1152b | 2097 | INIT_LIST_HEAD(&md->table_devices); |
7a8c3d3b | 2098 | spin_lock_init(&md->uevent_lock); |
1da177e4 | 2099 | |
47ace7e0 | 2100 | /* |
c62b37d9 CH |
2101 | * default to bio-based until DM table is loaded and md->type |
2102 | * established. If request-based table is loaded: blk-mq will | |
2103 | * override accordingly. | |
47ace7e0 | 2104 | */ |
74fa8f9c CH |
2105 | md->disk = blk_alloc_disk(NULL, md->numa_node_id); |
2106 | if (IS_ERR(md->disk)) | |
0f20972f | 2107 | goto bad; |
74fe6ba9 | 2108 | md->queue = md->disk->queue; |
1da177e4 | 2109 | |
f0b04115 | 2110 | init_waitqueue_head(&md->wait); |
53d5914f | 2111 | INIT_WORK(&md->work, dm_wq_work); |
8b211aac | 2112 | INIT_WORK(&md->requeue_work, dm_wq_requeue_work); |
f0b04115 | 2113 | init_waitqueue_head(&md->eventq); |
2995fa78 | 2114 | init_completion(&md->kobj_holder.completion); |
f0b04115 | 2115 | |
8b211aac | 2116 | md->requeue_list = NULL; |
a666e5c0 MP |
2117 | md->swap_bios = get_swap_bios(); |
2118 | sema_init(&md->swap_bios_semaphore, md->swap_bios); | |
2119 | mutex_init(&md->swap_bios_lock); | |
2120 | ||
1da177e4 LT |
2121 | md->disk->major = _major; |
2122 | md->disk->first_minor = minor; | |
74fe6ba9 | 2123 | md->disk->minors = 1; |
1ebe2e5f | 2124 | md->disk->flags |= GENHD_FL_NO_PART; |
1da177e4 | 2125 | md->disk->fops = &dm_blk_dops; |
1da177e4 LT |
2126 | md->disk->private_data = md; |
2127 | sprintf(md->disk->disk_name, "dm-%d", minor); | |
f26c5719 | 2128 | |
c2929072 MD |
2129 | dax_dev = alloc_dax(md, &dm_dax_ops); |
2130 | if (IS_ERR(dax_dev)) { | |
2131 | if (PTR_ERR(dax_dev) != -EOPNOTSUPP) | |
976431b0 | 2132 | goto bad; |
c2929072 MD |
2133 | } else { |
2134 | set_dax_nocache(dax_dev); | |
2135 | set_dax_nomc(dax_dev); | |
2136 | md->dax_dev = dax_dev; | |
2137 | if (dax_add_host(dax_dev, md->disk)) | |
976431b0 DW |
2138 | goto bad; |
2139 | } | |
f26c5719 | 2140 | |
7e51f257 | 2141 | format_dev_t(md->name, MKDEV(_major, minor)); |
1da177e4 | 2142 | |
c7c879ee | 2143 | md->wq = alloc_workqueue("kdmflush/%s", WQ_MEM_RECLAIM, 0, md->name); |
304f3f6a | 2144 | if (!md->wq) |
0f20972f | 2145 | goto bad; |
304f3f6a | 2146 | |
9f6dc633 MS |
2147 | md->pending_io = alloc_percpu(unsigned long); |
2148 | if (!md->pending_io) | |
2149 | goto bad; | |
2150 | ||
d3aa3e06 JJ |
2151 | r = dm_stats_init(&md->stats); |
2152 | if (r < 0) | |
2153 | goto bad; | |
fd2ed4d2 | 2154 | |
ba61fdd1 | 2155 | /* Populate the mapping, nobody knows we exist yet */ |
f32c10b0 | 2156 | spin_lock(&_minor_lock); |
ba61fdd1 | 2157 | old_md = idr_replace(&_minor_idr, md, minor); |
f32c10b0 | 2158 | spin_unlock(&_minor_lock); |
ba61fdd1 JM |
2159 | |
2160 | BUG_ON(old_md != MINOR_ALLOCED); | |
2161 | ||
1da177e4 LT |
2162 | return md; |
2163 | ||
0f20972f MS |
2164 | bad: |
2165 | cleanup_mapped_device(md); | |
83d5e5b0 | 2166 | bad_io_barrier: |
1da177e4 | 2167 | free_minor(minor); |
6ed7ade8 | 2168 | bad_minor: |
10da4f79 | 2169 | module_put(THIS_MODULE); |
6ed7ade8 | 2170 | bad_module_get: |
856eb091 | 2171 | kvfree(md); |
1da177e4 LT |
2172 | return NULL; |
2173 | } | |
2174 | ||
ae9da83f JN |
2175 | static void unlock_fs(struct mapped_device *md); |
2176 | ||
1da177e4 LT |
2177 | static void free_dev(struct mapped_device *md) |
2178 | { | |
f331c029 | 2179 | int minor = MINOR(disk_devt(md->disk)); |
63d94e48 | 2180 | |
32a926da | 2181 | unlock_fs(md); |
2eb6e1e3 | 2182 | |
0f20972f | 2183 | cleanup_mapped_device(md); |
63a4f065 | 2184 | |
992ec6a9 | 2185 | WARN_ON_ONCE(!list_empty(&md->table_devices)); |
63a4f065 | 2186 | dm_stats_cleanup(&md->stats); |
63a4f065 MS |
2187 | free_minor(minor); |
2188 | ||
10da4f79 | 2189 | module_put(THIS_MODULE); |
856eb091 | 2190 | kvfree(md); |
1da177e4 LT |
2191 | } |
2192 | ||
2193 | /* | |
2194 | * Bind a table to the device. | |
2195 | */ | |
2196 | static void event_callback(void *context) | |
2197 | { | |
7a8c3d3b MA |
2198 | unsigned long flags; |
2199 | LIST_HEAD(uevents); | |
d695e441 | 2200 | struct mapped_device *md = context; |
1da177e4 | 2201 | |
7a8c3d3b MA |
2202 | spin_lock_irqsave(&md->uevent_lock, flags); |
2203 | list_splice_init(&md->uevent_list, &uevents); | |
2204 | spin_unlock_irqrestore(&md->uevent_lock, flags); | |
2205 | ||
ed9e1982 | 2206 | dm_send_uevents(&uevents, &disk_to_dev(md->disk)->kobj); |
7a8c3d3b | 2207 | |
1da177e4 LT |
2208 | atomic_inc(&md->event_nr); |
2209 | wake_up(&md->eventq); | |
62e08243 | 2210 | dm_issue_global_event(); |
1da177e4 LT |
2211 | } |
2212 | ||
042d2a9b AK |
2213 | /* |
2214 | * Returns old map, which caller must destroy. | |
2215 | */ | |
2216 | static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, | |
2217 | struct queue_limits *limits) | |
1da177e4 | 2218 | { |
042d2a9b | 2219 | struct dm_table *old_map; |
1da177e4 | 2220 | sector_t size; |
2a2a4c51 | 2221 | int ret; |
1da177e4 | 2222 | |
5a8f1f80 BVA |
2223 | lockdep_assert_held(&md->suspend_lock); |
2224 | ||
1da177e4 | 2225 | size = dm_table_get_size(t); |
3ac51e74 DW |
2226 | |
2227 | /* | |
2228 | * Wipe any geometry if the size of the table changed. | |
2229 | */ | |
fd2ed4d2 | 2230 | if (size != dm_get_size(md)) |
3ac51e74 DW |
2231 | memset(&md->geometry, 0, sizeof(md->geometry)); |
2232 | ||
7533afa1 | 2233 | set_capacity(md->disk, size); |
d5816876 | 2234 | |
2ca3310e AK |
2235 | dm_table_event_callback(t, event_callback, md); |
2236 | ||
f5b4aee1 | 2237 | if (dm_table_request_based(t)) { |
16f12266 | 2238 | /* |
9c37de29 MS |
2239 | * Leverage the fact that request-based DM targets are |
2240 | * immutable singletons - used to optimize dm_mq_queue_rq. | |
16f12266 MS |
2241 | */ |
2242 | md->immutable_target = dm_table_get_immutable_target(t); | |
e6ee8c0b | 2243 | |
29dec90a CH |
2244 | /* |
2245 | * There is no need to reload with request-based dm because the | |
2246 | * size of front_pad doesn't change. | |
2247 | * | |
2248 | * Note for future: If you are to reload bioset, prep-ed | |
2249 | * requests in the queue may refer to bio from the old bioset, | |
2250 | * so you must walk through the queue to unprep. | |
2251 | */ | |
2252 | if (!md->mempools) { | |
2253 | md->mempools = t->mempools; | |
2254 | t->mempools = NULL; | |
2255 | } | |
2256 | } else { | |
2257 | /* | |
2258 | * The md may already have mempools that need changing. | |
2259 | * If so, reload bioset because front_pad may have changed | |
2260 | * because a different table was loaded. | |
2261 | */ | |
2262 | dm_free_md_mempools(md->mempools); | |
2263 | md->mempools = t->mempools; | |
2264 | t->mempools = NULL; | |
2a2a4c51 | 2265 | } |
e6ee8c0b | 2266 | |
f5b4aee1 | 2267 | ret = dm_table_set_restrictions(t, md->queue, limits); |
bb37d772 DLM |
2268 | if (ret) { |
2269 | old_map = ERR_PTR(ret); | |
2270 | goto out; | |
2271 | } | |
2272 | ||
a12f5d48 | 2273 | old_map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
1d3aa6f6 | 2274 | rcu_assign_pointer(md->map, (void *)t); |
36a0456f AK |
2275 | md->immutable_target_type = dm_table_get_immutable_target_type(t); |
2276 | ||
41abc4e1 HR |
2277 | if (old_map) |
2278 | dm_sync_table(md); | |
2a2a4c51 | 2279 | out: |
042d2a9b | 2280 | return old_map; |
1da177e4 LT |
2281 | } |
2282 | ||
a7940155 AK |
2283 | /* |
2284 | * Returns unbound table for the caller to free. | |
2285 | */ | |
2286 | static struct dm_table *__unbind(struct mapped_device *md) | |
1da177e4 | 2287 | { |
a12f5d48 | 2288 | struct dm_table *map = rcu_dereference_protected(md->map, 1); |
1da177e4 LT |
2289 | |
2290 | if (!map) | |
a7940155 | 2291 | return NULL; |
1da177e4 LT |
2292 | |
2293 | dm_table_event_callback(map, NULL, NULL); | |
9cdb8520 | 2294 | RCU_INIT_POINTER(md->map, NULL); |
83d5e5b0 | 2295 | dm_sync_table(md); |
a7940155 AK |
2296 | |
2297 | return map; | |
1da177e4 LT |
2298 | } |
2299 | ||
2300 | /* | |
2301 | * Constructor for a new device. | |
2302 | */ | |
2b06cfff | 2303 | int dm_create(int minor, struct mapped_device **result) |
1da177e4 LT |
2304 | { |
2305 | struct mapped_device *md; | |
2306 | ||
2b06cfff | 2307 | md = alloc_dev(minor); |
1da177e4 LT |
2308 | if (!md) |
2309 | return -ENXIO; | |
2310 | ||
91ccbbac TS |
2311 | dm_ima_reset_data(md); |
2312 | ||
1da177e4 LT |
2313 | *result = md; |
2314 | return 0; | |
2315 | } | |
2316 | ||
a5664dad MS |
2317 | /* |
2318 | * Functions to manage md->type. | |
2319 | * All are required to hold md->type_lock. | |
2320 | */ | |
2321 | void dm_lock_md_type(struct mapped_device *md) | |
2322 | { | |
2323 | mutex_lock(&md->type_lock); | |
2324 | } | |
2325 | ||
2326 | void dm_unlock_md_type(struct mapped_device *md) | |
2327 | { | |
2328 | mutex_unlock(&md->type_lock); | |
2329 | } | |
2330 | ||
7e0d574f | 2331 | void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type) |
a5664dad | 2332 | { |
00c4fc3b | 2333 | BUG_ON(!mutex_is_locked(&md->type_lock)); |
a5664dad MS |
2334 | md->type = type; |
2335 | } | |
2336 | ||
7e0d574f | 2337 | enum dm_queue_mode dm_get_md_type(struct mapped_device *md) |
a5664dad MS |
2338 | { |
2339 | return md->type; | |
2340 | } | |
2341 | ||
36a0456f AK |
2342 | struct target_type *dm_get_immutable_target_type(struct mapped_device *md) |
2343 | { | |
2344 | return md->immutable_target_type; | |
2345 | } | |
2346 | ||
4a0b4ddf MS |
2347 | /* |
2348 | * Setup the DM device's queue based on md's type | |
2349 | */ | |
591ddcfc | 2350 | int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t) |
4a0b4ddf | 2351 | { |
ba305859 | 2352 | enum dm_queue_mode type = dm_table_get_type(t); |
c100ec49 | 2353 | struct queue_limits limits; |
1a581b72 | 2354 | struct table_device *td; |
ba305859 | 2355 | int r; |
bfebd1cd | 2356 | |
545ed20e | 2357 | switch (type) { |
bfebd1cd | 2358 | case DM_TYPE_REQUEST_BASED: |
681cc5e8 | 2359 | md->disk->fops = &dm_rq_blk_dops; |
e83068a5 | 2360 | r = dm_mq_init_request_queue(md, t); |
bfebd1cd | 2361 | if (r) { |
681cc5e8 | 2362 | DMERR("Cannot initialize queue for request-based dm mapped device"); |
bfebd1cd MS |
2363 | return r; |
2364 | } | |
2365 | break; | |
2366 | case DM_TYPE_BIO_BASED: | |
545ed20e | 2367 | case DM_TYPE_DAX_BIO_BASED: |
526d1006 | 2368 | blk_queue_flag_set(QUEUE_FLAG_IO_STAT, md->queue); |
bfebd1cd | 2369 | break; |
7e0d574f BVA |
2370 | case DM_TYPE_NONE: |
2371 | WARN_ON_ONCE(true); | |
2372 | break; | |
4a0b4ddf MS |
2373 | } |
2374 | ||
c100ec49 MS |
2375 | r = dm_calculate_queue_limits(t, &limits); |
2376 | if (r) { | |
2377 | DMERR("Cannot calculate initial queue limits"); | |
2378 | return r; | |
2379 | } | |
bb37d772 DLM |
2380 | r = dm_table_set_restrictions(t, md->queue, &limits); |
2381 | if (r) | |
2382 | return r; | |
2383 | ||
d563792c YK |
2384 | /* |
2385 | * Hold lock to make sure add_disk() and del_gendisk() won't concurrent | |
2386 | * with open_table_device() and close_table_device(). | |
2387 | */ | |
2388 | mutex_lock(&md->table_devices_lock); | |
e7089f65 | 2389 | r = add_disk(md->disk); |
d563792c | 2390 | mutex_unlock(&md->table_devices_lock); |
e7089f65 LC |
2391 | if (r) |
2392 | return r; | |
c100ec49 | 2393 | |
1a581b72 CH |
2394 | /* |
2395 | * Register the holder relationship for devices added before the disk | |
2396 | * was live. | |
2397 | */ | |
2398 | list_for_each_entry(td, &md->table_devices, list) { | |
2399 | r = bd_link_disk_holder(td->dm_dev.bdev, md->disk); | |
2400 | if (r) | |
2401 | goto out_undo_holders; | |
89f871af | 2402 | } |
d563792c | 2403 | |
1a581b72 CH |
2404 | r = dm_sysfs_init(md); |
2405 | if (r) | |
2406 | goto out_undo_holders; | |
2407 | ||
89f871af | 2408 | md->type = type; |
4a0b4ddf | 2409 | return 0; |
1a581b72 CH |
2410 | |
2411 | out_undo_holders: | |
2412 | list_for_each_entry_continue_reverse(td, &md->table_devices, list) | |
2413 | bd_unlink_disk_holder(td->dm_dev.bdev, md->disk); | |
2414 | mutex_lock(&md->table_devices_lock); | |
2415 | del_gendisk(md->disk); | |
2416 | mutex_unlock(&md->table_devices_lock); | |
2417 | return r; | |
4a0b4ddf MS |
2418 | } |
2419 | ||
2bec1f4a | 2420 | struct mapped_device *dm_get_md(dev_t dev) |
1da177e4 LT |
2421 | { |
2422 | struct mapped_device *md; | |
86a3238c | 2423 | unsigned int minor = MINOR(dev); |
1da177e4 LT |
2424 | |
2425 | if (MAJOR(dev) != _major || minor >= (1 << MINORBITS)) | |
2426 | return NULL; | |
2427 | ||
f32c10b0 | 2428 | spin_lock(&_minor_lock); |
1da177e4 LT |
2429 | |
2430 | md = idr_find(&_minor_idr, minor); | |
49de5769 MS |
2431 | if (!md || md == MINOR_ALLOCED || (MINOR(disk_devt(dm_disk(md))) != minor) || |
2432 | test_bit(DMF_FREEING, &md->flags) || dm_deleting_md(md)) { | |
2433 | md = NULL; | |
2434 | goto out; | |
fba9f90e | 2435 | } |
49de5769 | 2436 | dm_get(md); |
fba9f90e | 2437 | out: |
f32c10b0 | 2438 | spin_unlock(&_minor_lock); |
1da177e4 | 2439 | |
637842cf DT |
2440 | return md; |
2441 | } | |
3cf2e4ba | 2442 | EXPORT_SYMBOL_GPL(dm_get_md); |
d229a958 | 2443 | |
9ade92a9 | 2444 | void *dm_get_mdptr(struct mapped_device *md) |
637842cf | 2445 | { |
9ade92a9 | 2446 | return md->interface_ptr; |
1da177e4 LT |
2447 | } |
2448 | ||
2449 | void dm_set_mdptr(struct mapped_device *md, void *ptr) | |
2450 | { | |
2451 | md->interface_ptr = ptr; | |
2452 | } | |
2453 | ||
2454 | void dm_get(struct mapped_device *md) | |
2455 | { | |
2456 | atomic_inc(&md->holders); | |
3f77316d | 2457 | BUG_ON(test_bit(DMF_FREEING, &md->flags)); |
1da177e4 LT |
2458 | } |
2459 | ||
09ee96b2 MP |
2460 | int dm_hold(struct mapped_device *md) |
2461 | { | |
2462 | spin_lock(&_minor_lock); | |
2463 | if (test_bit(DMF_FREEING, &md->flags)) { | |
2464 | spin_unlock(&_minor_lock); | |
2465 | return -EBUSY; | |
2466 | } | |
2467 | dm_get(md); | |
2468 | spin_unlock(&_minor_lock); | |
2469 | return 0; | |
2470 | } | |
2471 | EXPORT_SYMBOL_GPL(dm_hold); | |
2472 | ||
72d94861 AK |
2473 | const char *dm_device_name(struct mapped_device *md) |
2474 | { | |
2475 | return md->name; | |
2476 | } | |
2477 | EXPORT_SYMBOL_GPL(dm_device_name); | |
2478 | ||
3f77316d | 2479 | static void __dm_destroy(struct mapped_device *md, bool wait) |
1da177e4 | 2480 | { |
1134e5ae | 2481 | struct dm_table *map; |
83d5e5b0 | 2482 | int srcu_idx; |
1da177e4 | 2483 | |
3f77316d | 2484 | might_sleep(); |
fba9f90e | 2485 | |
63a4f065 | 2486 | spin_lock(&_minor_lock); |
3f77316d KU |
2487 | idr_replace(&_minor_idr, MINOR_ALLOCED, MINOR(disk_devt(dm_disk(md)))); |
2488 | set_bit(DMF_FREEING, &md->flags); | |
2489 | spin_unlock(&_minor_lock); | |
3b785fbc | 2490 | |
7a5428dc | 2491 | blk_mark_disk_dead(md->disk); |
3f77316d | 2492 | |
ab7c7bb6 MP |
2493 | /* |
2494 | * Take suspend_lock so that presuspend and postsuspend methods | |
2495 | * do not race with internal suspend. | |
2496 | */ | |
2497 | mutex_lock(&md->suspend_lock); | |
2a708cff | 2498 | map = dm_get_live_table(md, &srcu_idx); |
3f77316d KU |
2499 | if (!dm_suspended_md(md)) { |
2500 | dm_table_presuspend_targets(map); | |
adc0daad | 2501 | set_bit(DMF_SUSPENDED, &md->flags); |
5df96f2b | 2502 | set_bit(DMF_POST_SUSPENDING, &md->flags); |
3f77316d | 2503 | dm_table_postsuspend_targets(map); |
1da177e4 | 2504 | } |
238d991f | 2505 | /* dm_put_live_table must be before fsleep, otherwise deadlock is possible */ |
83d5e5b0 | 2506 | dm_put_live_table(md, srcu_idx); |
2a708cff | 2507 | mutex_unlock(&md->suspend_lock); |
83d5e5b0 | 2508 | |
3f77316d KU |
2509 | /* |
2510 | * Rare, but there may be I/O requests still going to complete, | |
2511 | * for example. Wait for all references to disappear. | |
2512 | * No one should increment the reference count of the mapped_device, | |
2513 | * after the mapped_device state becomes DMF_FREEING. | |
2514 | */ | |
2515 | if (wait) | |
2516 | while (atomic_read(&md->holders)) | |
238d991f | 2517 | fsleep(1000); |
3f77316d KU |
2518 | else if (atomic_read(&md->holders)) |
2519 | DMWARN("%s: Forcibly removing mapped_device still in use! (%d users)", | |
2520 | dm_device_name(md), atomic_read(&md->holders)); | |
2521 | ||
3f77316d KU |
2522 | dm_table_destroy(__unbind(md)); |
2523 | free_dev(md); | |
2524 | } | |
2525 | ||
2526 | void dm_destroy(struct mapped_device *md) | |
2527 | { | |
2528 | __dm_destroy(md, true); | |
2529 | } | |
2530 | ||
2531 | void dm_destroy_immediate(struct mapped_device *md) | |
2532 | { | |
2533 | __dm_destroy(md, false); | |
2534 | } | |
2535 | ||
2536 | void dm_put(struct mapped_device *md) | |
2537 | { | |
2538 | atomic_dec(&md->holders); | |
1da177e4 | 2539 | } |
79eb885c | 2540 | EXPORT_SYMBOL_GPL(dm_put); |
1da177e4 | 2541 | |
9f6dc633 | 2542 | static bool dm_in_flight_bios(struct mapped_device *md) |
85067747 ML |
2543 | { |
2544 | int cpu; | |
9f6dc633 | 2545 | unsigned long sum = 0; |
85067747 | 2546 | |
9f6dc633 MS |
2547 | for_each_possible_cpu(cpu) |
2548 | sum += *per_cpu_ptr(md->pending_io, cpu); | |
85067747 ML |
2549 | |
2550 | return sum != 0; | |
2551 | } | |
2552 | ||
2f064a59 | 2553 | static int dm_wait_for_bios_completion(struct mapped_device *md, unsigned int task_state) |
46125c1c MB |
2554 | { |
2555 | int r = 0; | |
9f4c3f87 | 2556 | DEFINE_WAIT(wait); |
46125c1c | 2557 | |
85067747 | 2558 | while (true) { |
9f4c3f87 | 2559 | prepare_to_wait(&md->wait, &wait, task_state); |
46125c1c | 2560 | |
9f6dc633 | 2561 | if (!dm_in_flight_bios(md)) |
46125c1c MB |
2562 | break; |
2563 | ||
e3fabdfd | 2564 | if (signal_pending_state(task_state, current)) { |
46125c1c MB |
2565 | r = -EINTR; |
2566 | break; | |
2567 | } | |
2568 | ||
2569 | io_schedule(); | |
2570 | } | |
9f4c3f87 | 2571 | finish_wait(&md->wait, &wait); |
b44ebeb0 | 2572 | |
9f6dc633 MS |
2573 | smp_rmb(); |
2574 | ||
46125c1c MB |
2575 | return r; |
2576 | } | |
2577 | ||
2f064a59 | 2578 | static int dm_wait_for_completion(struct mapped_device *md, unsigned int task_state) |
85067747 ML |
2579 | { |
2580 | int r = 0; | |
2581 | ||
2582 | if (!queue_is_mq(md->queue)) | |
2583 | return dm_wait_for_bios_completion(md, task_state); | |
2584 | ||
2585 | while (true) { | |
2586 | if (!blk_mq_queue_inflight(md->queue)) | |
2587 | break; | |
2588 | ||
2589 | if (signal_pending_state(task_state, current)) { | |
2590 | r = -EINTR; | |
2591 | break; | |
2592 | } | |
2593 | ||
238d991f | 2594 | fsleep(5000); |
85067747 ML |
2595 | } |
2596 | ||
2597 | return r; | |
2598 | } | |
2599 | ||
1da177e4 LT |
2600 | /* |
2601 | * Process the deferred bios | |
2602 | */ | |
ef208587 | 2603 | static void dm_wq_work(struct work_struct *work) |
1da177e4 | 2604 | { |
0c2915b8 MS |
2605 | struct mapped_device *md = container_of(work, struct mapped_device, work); |
2606 | struct bio *bio; | |
ef208587 | 2607 | |
3b00b203 | 2608 | while (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) { |
df12ee99 | 2609 | spin_lock_irq(&md->deferred_lock); |
0c2915b8 | 2610 | bio = bio_list_pop(&md->deferred); |
df12ee99 AK |
2611 | spin_unlock_irq(&md->deferred_lock); |
2612 | ||
0c2915b8 | 2613 | if (!bio) |
df12ee99 | 2614 | break; |
022c2611 | 2615 | |
0c2915b8 | 2616 | submit_bio_noacct(bio); |
0ca44fce | 2617 | cond_resched(); |
022c2611 | 2618 | } |
1da177e4 LT |
2619 | } |
2620 | ||
9a1fb464 | 2621 | static void dm_queue_flush(struct mapped_device *md) |
304f3f6a | 2622 | { |
3b00b203 | 2623 | clear_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
4e857c58 | 2624 | smp_mb__after_atomic(); |
53d5914f | 2625 | queue_work(md->wq, &md->work); |
304f3f6a MB |
2626 | } |
2627 | ||
1da177e4 | 2628 | /* |
042d2a9b | 2629 | * Swap in a new table, returning the old one for the caller to destroy. |
1da177e4 | 2630 | */ |
042d2a9b | 2631 | struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table) |
1da177e4 | 2632 | { |
87eb5b21 | 2633 | struct dm_table *live_map = NULL, *map = ERR_PTR(-EINVAL); |
754c5fc7 | 2634 | struct queue_limits limits; |
042d2a9b | 2635 | int r; |
1da177e4 | 2636 | |
e61290a4 | 2637 | mutex_lock(&md->suspend_lock); |
1da177e4 LT |
2638 | |
2639 | /* device must be suspended */ | |
4f186f8b | 2640 | if (!dm_suspended_md(md)) |
93c534ae | 2641 | goto out; |
1da177e4 | 2642 | |
3ae70656 MS |
2643 | /* |
2644 | * If the new table has no data devices, retain the existing limits. | |
2645 | * This helps multipath with queue_if_no_path if all paths disappear, | |
2646 | * then new I/O is queued based on these limits, and then some paths | |
2647 | * reappear. | |
2648 | */ | |
2649 | if (dm_table_has_no_data_devices(table)) { | |
83d5e5b0 | 2650 | live_map = dm_get_live_table_fast(md); |
3ae70656 MS |
2651 | if (live_map) |
2652 | limits = md->queue->limits; | |
83d5e5b0 | 2653 | dm_put_live_table_fast(md); |
3ae70656 MS |
2654 | } |
2655 | ||
87eb5b21 MC |
2656 | if (!live_map) { |
2657 | r = dm_calculate_queue_limits(table, &limits); | |
2658 | if (r) { | |
2659 | map = ERR_PTR(r); | |
2660 | goto out; | |
2661 | } | |
042d2a9b | 2662 | } |
754c5fc7 | 2663 | |
042d2a9b | 2664 | map = __bind(md, table, &limits); |
62e08243 | 2665 | dm_issue_global_event(); |
1da177e4 | 2666 | |
93c534ae | 2667 | out: |
e61290a4 | 2668 | mutex_unlock(&md->suspend_lock); |
042d2a9b | 2669 | return map; |
1da177e4 LT |
2670 | } |
2671 | ||
2672 | /* | |
2673 | * Functions to lock and unlock any filesystem running on the | |
2674 | * device. | |
2675 | */ | |
2ca3310e | 2676 | static int lock_fs(struct mapped_device *md) |
1da177e4 | 2677 | { |
e39e2e95 | 2678 | int r; |
1da177e4 | 2679 | |
040f04bd | 2680 | WARN_ON(test_bit(DMF_FROZEN, &md->flags)); |
aa8d7c2f | 2681 | |
982c3b30 | 2682 | r = bdev_freeze(md->disk->part0); |
040f04bd CH |
2683 | if (!r) |
2684 | set_bit(DMF_FROZEN, &md->flags); | |
2685 | return r; | |
1da177e4 LT |
2686 | } |
2687 | ||
2ca3310e | 2688 | static void unlock_fs(struct mapped_device *md) |
1da177e4 | 2689 | { |
aa8d7c2f AK |
2690 | if (!test_bit(DMF_FROZEN, &md->flags)) |
2691 | return; | |
982c3b30 | 2692 | bdev_thaw(md->disk->part0); |
aa8d7c2f | 2693 | clear_bit(DMF_FROZEN, &md->flags); |
1da177e4 LT |
2694 | } |
2695 | ||
2696 | /* | |
b48633f8 BVA |
2697 | * @suspend_flags: DM_SUSPEND_LOCKFS_FLAG and/or DM_SUSPEND_NOFLUSH_FLAG |
2698 | * @task_state: e.g. TASK_INTERRUPTIBLE or TASK_UNINTERRUPTIBLE | |
2699 | * @dmf_suspended_flag: DMF_SUSPENDED or DMF_SUSPENDED_INTERNALLY | |
2700 | * | |
ffcc3936 MS |
2701 | * If __dm_suspend returns 0, the device is completely quiescent |
2702 | * now. There is no request-processing activity. All new requests | |
2703 | * are being added to md->deferred list. | |
cec47e3d | 2704 | */ |
ffcc3936 | 2705 | static int __dm_suspend(struct mapped_device *md, struct dm_table *map, |
86a3238c | 2706 | unsigned int suspend_flags, unsigned int task_state, |
eaf9a736 | 2707 | int dmf_suspended_flag) |
1da177e4 | 2708 | { |
ffcc3936 MS |
2709 | bool do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG; |
2710 | bool noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG; | |
2711 | int r; | |
1da177e4 | 2712 | |
5a8f1f80 BVA |
2713 | lockdep_assert_held(&md->suspend_lock); |
2714 | ||
2e93ccc1 KU |
2715 | /* |
2716 | * DMF_NOFLUSH_SUSPENDING must be set before presuspend. | |
2717 | * This flag is cleared before dm_suspend returns. | |
2718 | */ | |
2719 | if (noflush) | |
2720 | set_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); | |
86331f39 | 2721 | else |
ac75b09f | 2722 | DMDEBUG("%s: suspending with flush", dm_device_name(md)); |
2e93ccc1 | 2723 | |
d67ee213 MS |
2724 | /* |
2725 | * This gets reverted if there's an error later and the targets | |
2726 | * provide the .presuspend_undo hook. | |
2727 | */ | |
cf222b37 AK |
2728 | dm_table_presuspend_targets(map); |
2729 | ||
32a926da | 2730 | /* |
9f518b27 KU |
2731 | * Flush I/O to the device. |
2732 | * Any I/O submitted after lock_fs() may not be flushed. | |
2733 | * noflush takes precedence over do_lockfs. | |
2734 | * (lock_fs() flushes I/Os and waits for them to complete.) | |
32a926da MP |
2735 | */ |
2736 | if (!noflush && do_lockfs) { | |
2737 | r = lock_fs(md); | |
d67ee213 MS |
2738 | if (r) { |
2739 | dm_table_presuspend_undo_targets(map); | |
ffcc3936 | 2740 | return r; |
d67ee213 | 2741 | } |
aa8d7c2f | 2742 | } |
1da177e4 LT |
2743 | |
2744 | /* | |
3b00b203 MP |
2745 | * Here we must make sure that no processes are submitting requests |
2746 | * to target drivers i.e. no one may be executing | |
96c9865c | 2747 | * dm_split_and_process_bio from dm_submit_bio. |
3b00b203 | 2748 | * |
96c9865c | 2749 | * To get all processes out of dm_split_and_process_bio in dm_submit_bio, |
3b00b203 | 2750 | * we take the write lock. To prevent any process from reentering |
96c9865c | 2751 | * dm_split_and_process_bio from dm_submit_bio and quiesce the thread |
0cede372 | 2752 | * (dm_wq_work), we set DMF_BLOCK_IO_FOR_SUSPEND and call |
6a8736d1 | 2753 | * flush_workqueue(md->wq). |
1da177e4 | 2754 | */ |
1eb787ec | 2755 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
41abc4e1 HR |
2756 | if (map) |
2757 | synchronize_srcu(&md->io_barrier); | |
1da177e4 | 2758 | |
d0bcb878 | 2759 | /* |
29e4013d TH |
2760 | * Stop md->queue before flushing md->wq in case request-based |
2761 | * dm defers requests to md->wq from md->queue. | |
d0bcb878 | 2762 | */ |
6a23e05c | 2763 | if (dm_request_based(md)) |
eca7ee6d | 2764 | dm_stop_queue(md->queue); |
cec47e3d | 2765 | |
d0bcb878 KU |
2766 | flush_workqueue(md->wq); |
2767 | ||
1da177e4 | 2768 | /* |
3b00b203 MP |
2769 | * At this point no more requests are entering target request routines. |
2770 | * We call dm_wait_for_completion to wait for all existing requests | |
2771 | * to finish. | |
1da177e4 | 2772 | */ |
b48633f8 | 2773 | r = dm_wait_for_completion(md, task_state); |
eaf9a736 MS |
2774 | if (!r) |
2775 | set_bit(dmf_suspended_flag, &md->flags); | |
1da177e4 | 2776 | |
6d6f10df | 2777 | if (noflush) |
022c2611 | 2778 | clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); |
41abc4e1 HR |
2779 | if (map) |
2780 | synchronize_srcu(&md->io_barrier); | |
2e93ccc1 | 2781 | |
1da177e4 | 2782 | /* were we interrupted ? */ |
46125c1c | 2783 | if (r < 0) { |
9a1fb464 | 2784 | dm_queue_flush(md); |
73d410c0 | 2785 | |
cec47e3d | 2786 | if (dm_request_based(md)) |
eca7ee6d | 2787 | dm_start_queue(md->queue); |
cec47e3d | 2788 | |
2ca3310e | 2789 | unlock_fs(md); |
d67ee213 | 2790 | dm_table_presuspend_undo_targets(map); |
ffcc3936 | 2791 | /* pushback list is already flushed, so skip flush */ |
2ca3310e | 2792 | } |
1da177e4 | 2793 | |
ffcc3936 MS |
2794 | return r; |
2795 | } | |
2796 | ||
2797 | /* | |
2798 | * We need to be able to change a mapping table under a mounted | |
2799 | * filesystem. For example we might want to move some data in | |
2800 | * the background. Before the table can be swapped with | |
2801 | * dm_bind_table, dm_suspend must be called to flush any in | |
2802 | * flight bios and ensure that any further io gets deferred. | |
2803 | */ | |
2804 | /* | |
2805 | * Suspend mechanism in request-based dm. | |
2806 | * | |
2807 | * 1. Flush all I/Os by lock_fs() if needed. | |
2808 | * 2. Stop dispatching any I/O by stopping the request_queue. | |
2809 | * 3. Wait for all in-flight I/Os to be completed or requeued. | |
2810 | * | |
2811 | * To abort suspend, start the request_queue. | |
2812 | */ | |
86a3238c | 2813 | int dm_suspend(struct mapped_device *md, unsigned int suspend_flags) |
ffcc3936 MS |
2814 | { |
2815 | struct dm_table *map = NULL; | |
2816 | int r = 0; | |
2817 | ||
2818 | retry: | |
2819 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); | |
2820 | ||
2821 | if (dm_suspended_md(md)) { | |
2822 | r = -EINVAL; | |
2823 | goto out_unlock; | |
2824 | } | |
2825 | ||
2826 | if (dm_suspended_internally_md(md)) { | |
2827 | /* already internally suspended, wait for internal resume */ | |
2828 | mutex_unlock(&md->suspend_lock); | |
2829 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); | |
2830 | if (r) | |
2831 | return r; | |
2832 | goto retry; | |
2833 | } | |
2834 | ||
a12f5d48 | 2835 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
2760904d LL |
2836 | if (!map) { |
2837 | /* avoid deadlock with fs/namespace.c:do_mount() */ | |
2838 | suspend_flags &= ~DM_SUSPEND_LOCKFS_FLAG; | |
2839 | } | |
ffcc3936 | 2840 | |
eaf9a736 | 2841 | r = __dm_suspend(md, map, suspend_flags, TASK_INTERRUPTIBLE, DMF_SUSPENDED); |
ffcc3936 MS |
2842 | if (r) |
2843 | goto out_unlock; | |
3b00b203 | 2844 | |
5df96f2b | 2845 | set_bit(DMF_POST_SUSPENDING, &md->flags); |
4d4471cb | 2846 | dm_table_postsuspend_targets(map); |
5df96f2b | 2847 | clear_bit(DMF_POST_SUSPENDING, &md->flags); |
4d4471cb | 2848 | |
d287483d | 2849 | out_unlock: |
e61290a4 | 2850 | mutex_unlock(&md->suspend_lock); |
cf222b37 | 2851 | return r; |
1da177e4 LT |
2852 | } |
2853 | ||
ffcc3936 MS |
2854 | static int __dm_resume(struct mapped_device *md, struct dm_table *map) |
2855 | { | |
2856 | if (map) { | |
2857 | int r = dm_table_resume_targets(map); | |
b30f1607 | 2858 | |
ffcc3936 MS |
2859 | if (r) |
2860 | return r; | |
2861 | } | |
2862 | ||
2863 | dm_queue_flush(md); | |
2864 | ||
2865 | /* | |
2866 | * Flushing deferred I/Os must be done after targets are resumed | |
2867 | * so that mapping of targets can work correctly. | |
2868 | * Request-based dm is queueing the deferred I/Os in its request_queue. | |
2869 | */ | |
2870 | if (dm_request_based(md)) | |
eca7ee6d | 2871 | dm_start_queue(md->queue); |
ffcc3936 MS |
2872 | |
2873 | unlock_fs(md); | |
2874 | ||
2875 | return 0; | |
2876 | } | |
2877 | ||
1da177e4 LT |
2878 | int dm_resume(struct mapped_device *md) |
2879 | { | |
8dc23658 | 2880 | int r; |
cf222b37 | 2881 | struct dm_table *map = NULL; |
1da177e4 | 2882 | |
ffcc3936 | 2883 | retry: |
8dc23658 | 2884 | r = -EINVAL; |
ffcc3936 MS |
2885 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); |
2886 | ||
4f186f8b | 2887 | if (!dm_suspended_md(md)) |
cf222b37 | 2888 | goto out; |
cf222b37 | 2889 | |
ffcc3936 MS |
2890 | if (dm_suspended_internally_md(md)) { |
2891 | /* already internally suspended, wait for internal resume */ | |
2892 | mutex_unlock(&md->suspend_lock); | |
2893 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); | |
2894 | if (r) | |
2895 | return r; | |
2896 | goto retry; | |
2897 | } | |
2898 | ||
a12f5d48 | 2899 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
2ca3310e | 2900 | if (!map || !dm_table_get_size(map)) |
cf222b37 | 2901 | goto out; |
1da177e4 | 2902 | |
ffcc3936 | 2903 | r = __dm_resume(md, map); |
8757b776 MB |
2904 | if (r) |
2905 | goto out; | |
2ca3310e | 2906 | |
2ca3310e | 2907 | clear_bit(DMF_SUSPENDED, &md->flags); |
cf222b37 | 2908 | out: |
e61290a4 | 2909 | mutex_unlock(&md->suspend_lock); |
2ca3310e | 2910 | |
cf222b37 | 2911 | return r; |
1da177e4 LT |
2912 | } |
2913 | ||
fd2ed4d2 MP |
2914 | /* |
2915 | * Internal suspend/resume works like userspace-driven suspend. It waits | |
2916 | * until all bios finish and prevents issuing new bios to the target drivers. | |
2917 | * It may be used only from the kernel. | |
fd2ed4d2 MP |
2918 | */ |
2919 | ||
86a3238c | 2920 | static void __dm_internal_suspend(struct mapped_device *md, unsigned int suspend_flags) |
fd2ed4d2 | 2921 | { |
ffcc3936 MS |
2922 | struct dm_table *map = NULL; |
2923 | ||
1ea0654e BVA |
2924 | lockdep_assert_held(&md->suspend_lock); |
2925 | ||
96b26c8c | 2926 | if (md->internal_suspend_count++) |
ffcc3936 MS |
2927 | return; /* nested internal suspend */ |
2928 | ||
2929 | if (dm_suspended_md(md)) { | |
2930 | set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2931 | return; /* nest suspend */ | |
2932 | } | |
2933 | ||
a12f5d48 | 2934 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
ffcc3936 MS |
2935 | |
2936 | /* | |
2937 | * Using TASK_UNINTERRUPTIBLE because only NOFLUSH internal suspend is | |
2938 | * supported. Properly supporting a TASK_INTERRUPTIBLE internal suspend | |
2939 | * would require changing .presuspend to return an error -- avoid this | |
2940 | * until there is a need for more elaborate variants of internal suspend. | |
2941 | */ | |
eaf9a736 MS |
2942 | (void) __dm_suspend(md, map, suspend_flags, TASK_UNINTERRUPTIBLE, |
2943 | DMF_SUSPENDED_INTERNALLY); | |
ffcc3936 | 2944 | |
5df96f2b | 2945 | set_bit(DMF_POST_SUSPENDING, &md->flags); |
ffcc3936 | 2946 | dm_table_postsuspend_targets(map); |
5df96f2b | 2947 | clear_bit(DMF_POST_SUSPENDING, &md->flags); |
ffcc3936 MS |
2948 | } |
2949 | ||
2950 | static void __dm_internal_resume(struct mapped_device *md) | |
2951 | { | |
65e8fbde MP |
2952 | int r; |
2953 | struct dm_table *map; | |
2954 | ||
96b26c8c MP |
2955 | BUG_ON(!md->internal_suspend_count); |
2956 | ||
2957 | if (--md->internal_suspend_count) | |
ffcc3936 MS |
2958 | return; /* resume from nested internal suspend */ |
2959 | ||
fd2ed4d2 | 2960 | if (dm_suspended_md(md)) |
ffcc3936 MS |
2961 | goto done; /* resume from nested suspend */ |
2962 | ||
65e8fbde MP |
2963 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
2964 | r = __dm_resume(md, map); | |
2965 | if (r) { | |
2966 | /* | |
2967 | * If a preresume method of some target failed, we are in a | |
2968 | * tricky situation. We can't return an error to the caller. We | |
2969 | * can't fake success because then the "resume" and | |
2970 | * "postsuspend" methods would not be paired correctly, and it | |
2971 | * would break various targets, for example it would cause list | |
2972 | * corruption in the "origin" target. | |
2973 | * | |
2974 | * So, we fake normal suspend here, to make sure that the | |
2975 | * "resume" and "postsuspend" methods will be paired correctly. | |
2976 | */ | |
2977 | DMERR("Preresume method failed: %d", r); | |
2978 | set_bit(DMF_SUSPENDED, &md->flags); | |
2979 | } | |
ffcc3936 MS |
2980 | done: |
2981 | clear_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2982 | smp_mb__after_atomic(); | |
2983 | wake_up_bit(&md->flags, DMF_SUSPENDED_INTERNALLY); | |
2984 | } | |
2985 | ||
2986 | void dm_internal_suspend_noflush(struct mapped_device *md) | |
2987 | { | |
2988 | mutex_lock(&md->suspend_lock); | |
2989 | __dm_internal_suspend(md, DM_SUSPEND_NOFLUSH_FLAG); | |
2990 | mutex_unlock(&md->suspend_lock); | |
2991 | } | |
2992 | EXPORT_SYMBOL_GPL(dm_internal_suspend_noflush); | |
2993 | ||
2994 | void dm_internal_resume(struct mapped_device *md) | |
2995 | { | |
2996 | mutex_lock(&md->suspend_lock); | |
2997 | __dm_internal_resume(md); | |
2998 | mutex_unlock(&md->suspend_lock); | |
2999 | } | |
3000 | EXPORT_SYMBOL_GPL(dm_internal_resume); | |
3001 | ||
3002 | /* | |
3003 | * Fast variants of internal suspend/resume hold md->suspend_lock, | |
3004 | * which prevents interaction with userspace-driven suspend. | |
3005 | */ | |
3006 | ||
3007 | void dm_internal_suspend_fast(struct mapped_device *md) | |
3008 | { | |
3009 | mutex_lock(&md->suspend_lock); | |
3010 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) | |
fd2ed4d2 MP |
3011 | return; |
3012 | ||
3013 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); | |
3014 | synchronize_srcu(&md->io_barrier); | |
3015 | flush_workqueue(md->wq); | |
3016 | dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE); | |
3017 | } | |
b735fede | 3018 | EXPORT_SYMBOL_GPL(dm_internal_suspend_fast); |
fd2ed4d2 | 3019 | |
ffcc3936 | 3020 | void dm_internal_resume_fast(struct mapped_device *md) |
fd2ed4d2 | 3021 | { |
ffcc3936 | 3022 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) |
fd2ed4d2 MP |
3023 | goto done; |
3024 | ||
3025 | dm_queue_flush(md); | |
3026 | ||
3027 | done: | |
3028 | mutex_unlock(&md->suspend_lock); | |
3029 | } | |
b735fede | 3030 | EXPORT_SYMBOL_GPL(dm_internal_resume_fast); |
fd2ed4d2 | 3031 | |
a4a82ce3 HM |
3032 | /* |
3033 | *--------------------------------------------------------------- | |
1da177e4 | 3034 | * Event notification. |
a4a82ce3 HM |
3035 | *--------------------------------------------------------------- |
3036 | */ | |
3abf85b5 | 3037 | int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, |
86a3238c | 3038 | unsigned int cookie, bool need_resize_uevent) |
69267a30 | 3039 | { |
6958c1c6 | 3040 | int r; |
86a3238c | 3041 | unsigned int noio_flag; |
60935eb2 | 3042 | char udev_cookie[DM_COOKIE_LENGTH]; |
7533afa1 MP |
3043 | char *envp[3] = { NULL, NULL, NULL }; |
3044 | char **envpp = envp; | |
3045 | if (cookie) { | |
60935eb2 MB |
3046 | snprintf(udev_cookie, DM_COOKIE_LENGTH, "%s=%u", |
3047 | DM_COOKIE_ENV_VAR_NAME, cookie); | |
7533afa1 | 3048 | *envpp++ = udev_cookie; |
60935eb2 | 3049 | } |
7533afa1 MP |
3050 | if (need_resize_uevent) { |
3051 | *envpp++ = "RESIZE=1"; | |
3052 | } | |
3053 | ||
3054 | noio_flag = memalloc_noio_save(); | |
3055 | ||
3056 | r = kobject_uevent_env(&disk_to_dev(md->disk)->kobj, action, envp); | |
6958c1c6 MP |
3057 | |
3058 | memalloc_noio_restore(noio_flag); | |
3059 | ||
3060 | return r; | |
69267a30 AK |
3061 | } |
3062 | ||
7a8c3d3b MA |
3063 | uint32_t dm_next_uevent_seq(struct mapped_device *md) |
3064 | { | |
3065 | return atomic_add_return(1, &md->uevent_seq); | |
3066 | } | |
3067 | ||
1da177e4 LT |
3068 | uint32_t dm_get_event_nr(struct mapped_device *md) |
3069 | { | |
3070 | return atomic_read(&md->event_nr); | |
3071 | } | |
3072 | ||
3073 | int dm_wait_event(struct mapped_device *md, int event_nr) | |
3074 | { | |
3075 | return wait_event_interruptible(md->eventq, | |
3076 | (event_nr != atomic_read(&md->event_nr))); | |
3077 | } | |
3078 | ||
7a8c3d3b MA |
3079 | void dm_uevent_add(struct mapped_device *md, struct list_head *elist) |
3080 | { | |
3081 | unsigned long flags; | |
3082 | ||
3083 | spin_lock_irqsave(&md->uevent_lock, flags); | |
3084 | list_add(elist, &md->uevent_list); | |
3085 | spin_unlock_irqrestore(&md->uevent_lock, flags); | |
3086 | } | |
3087 | ||
1da177e4 LT |
3088 | /* |
3089 | * The gendisk is only valid as long as you have a reference | |
3090 | * count on 'md'. | |
3091 | */ | |
3092 | struct gendisk *dm_disk(struct mapped_device *md) | |
3093 | { | |
3094 | return md->disk; | |
3095 | } | |
65ff5b7d | 3096 | EXPORT_SYMBOL_GPL(dm_disk); |
1da177e4 | 3097 | |
784aae73 MB |
3098 | struct kobject *dm_kobject(struct mapped_device *md) |
3099 | { | |
2995fa78 | 3100 | return &md->kobj_holder.kobj; |
784aae73 MB |
3101 | } |
3102 | ||
784aae73 MB |
3103 | struct mapped_device *dm_get_from_kobject(struct kobject *kobj) |
3104 | { | |
3105 | struct mapped_device *md; | |
3106 | ||
2995fa78 | 3107 | md = container_of(kobj, struct mapped_device, kobj_holder.kobj); |
784aae73 | 3108 | |
b9a41d21 HT |
3109 | spin_lock(&_minor_lock); |
3110 | if (test_bit(DMF_FREEING, &md->flags) || dm_deleting_md(md)) { | |
3111 | md = NULL; | |
3112 | goto out; | |
3113 | } | |
784aae73 | 3114 | dm_get(md); |
b9a41d21 HT |
3115 | out: |
3116 | spin_unlock(&_minor_lock); | |
3117 | ||
784aae73 MB |
3118 | return md; |
3119 | } | |
3120 | ||
4f186f8b | 3121 | int dm_suspended_md(struct mapped_device *md) |
1da177e4 LT |
3122 | { |
3123 | return test_bit(DMF_SUSPENDED, &md->flags); | |
3124 | } | |
3125 | ||
5df96f2b MP |
3126 | static int dm_post_suspending_md(struct mapped_device *md) |
3127 | { | |
3128 | return test_bit(DMF_POST_SUSPENDING, &md->flags); | |
3129 | } | |
3130 | ||
ffcc3936 MS |
3131 | int dm_suspended_internally_md(struct mapped_device *md) |
3132 | { | |
3133 | return test_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
3134 | } | |
3135 | ||
2c140a24 MP |
3136 | int dm_test_deferred_remove_flag(struct mapped_device *md) |
3137 | { | |
3138 | return test_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
3139 | } | |
3140 | ||
64dbce58 KU |
3141 | int dm_suspended(struct dm_target *ti) |
3142 | { | |
33bd6f06 | 3143 | return dm_suspended_md(ti->table->md); |
64dbce58 KU |
3144 | } |
3145 | EXPORT_SYMBOL_GPL(dm_suspended); | |
3146 | ||
5df96f2b MP |
3147 | int dm_post_suspending(struct dm_target *ti) |
3148 | { | |
33bd6f06 | 3149 | return dm_post_suspending_md(ti->table->md); |
5df96f2b MP |
3150 | } |
3151 | EXPORT_SYMBOL_GPL(dm_post_suspending); | |
3152 | ||
2e93ccc1 KU |
3153 | int dm_noflush_suspending(struct dm_target *ti) |
3154 | { | |
33bd6f06 | 3155 | return __noflush_suspending(ti->table->md); |
2e93ccc1 KU |
3156 | } |
3157 | EXPORT_SYMBOL_GPL(dm_noflush_suspending); | |
3158 | ||
e6ee8c0b KU |
3159 | void dm_free_md_mempools(struct dm_md_mempools *pools) |
3160 | { | |
3161 | if (!pools) | |
3162 | return; | |
3163 | ||
6f1c819c KO |
3164 | bioset_exit(&pools->bs); |
3165 | bioset_exit(&pools->io_bs); | |
e6ee8c0b KU |
3166 | |
3167 | kfree(pools); | |
3168 | } | |
3169 | ||
9c72bad1 CH |
3170 | struct dm_pr { |
3171 | u64 old_key; | |
3172 | u64 new_key; | |
3173 | u32 flags; | |
c6adada5 | 3174 | bool abort; |
9c72bad1 | 3175 | bool fail_early; |
8dd87f3c | 3176 | int ret; |
70151087 | 3177 | enum pr_type type; |
8a8da082 MC |
3178 | struct pr_keys *read_keys; |
3179 | struct pr_held_reservation *rsv; | |
9c72bad1 CH |
3180 | }; |
3181 | ||
3182 | static int dm_call_pr(struct block_device *bdev, iterate_devices_callout_fn fn, | |
8dd87f3c | 3183 | struct dm_pr *pr) |
71cdb697 CH |
3184 | { |
3185 | struct mapped_device *md = bdev->bd_disk->private_data; | |
9c72bad1 CH |
3186 | struct dm_table *table; |
3187 | struct dm_target *ti; | |
3188 | int ret = -ENOTTY, srcu_idx; | |
71cdb697 | 3189 | |
9c72bad1 CH |
3190 | table = dm_get_live_table(md, &srcu_idx); |
3191 | if (!table || !dm_table_get_size(table)) | |
3192 | goto out; | |
71cdb697 | 3193 | |
9c72bad1 | 3194 | /* We only support devices that have a single target */ |
2aec377a | 3195 | if (table->num_targets != 1) |
9c72bad1 CH |
3196 | goto out; |
3197 | ti = dm_table_get_target(table, 0); | |
71cdb697 | 3198 | |
e120a5f1 MS |
3199 | if (dm_suspended_md(md)) { |
3200 | ret = -EAGAIN; | |
3201 | goto out; | |
3202 | } | |
3203 | ||
9c72bad1 CH |
3204 | ret = -EINVAL; |
3205 | if (!ti->type->iterate_devices) | |
3206 | goto out; | |
3207 | ||
8dd87f3c MC |
3208 | ti->type->iterate_devices(ti, fn, pr); |
3209 | ret = 0; | |
9c72bad1 CH |
3210 | out: |
3211 | dm_put_live_table(md, srcu_idx); | |
3212 | return ret; | |
3213 | } | |
3214 | ||
3215 | /* | |
3216 | * For register / unregister we need to manually call out to every path. | |
3217 | */ | |
3218 | static int __dm_pr_register(struct dm_target *ti, struct dm_dev *dev, | |
3219 | sector_t start, sector_t len, void *data) | |
3220 | { | |
3221 | struct dm_pr *pr = data; | |
3222 | const struct pr_ops *ops = dev->bdev->bd_disk->fops->pr_ops; | |
8dd87f3c MC |
3223 | int ret; |
3224 | ||
3225 | if (!ops || !ops->pr_register) { | |
3226 | pr->ret = -EOPNOTSUPP; | |
3227 | return -1; | |
3228 | } | |
9c72bad1 | 3229 | |
8dd87f3c MC |
3230 | ret = ops->pr_register(dev->bdev, pr->old_key, pr->new_key, pr->flags); |
3231 | if (!ret) | |
3232 | return 0; | |
3233 | ||
3234 | if (!pr->ret) | |
3235 | pr->ret = ret; | |
9c72bad1 | 3236 | |
8dd87f3c MC |
3237 | if (pr->fail_early) |
3238 | return -1; | |
3239 | ||
3240 | return 0; | |
9c72bad1 CH |
3241 | } |
3242 | ||
3243 | static int dm_pr_register(struct block_device *bdev, u64 old_key, u64 new_key, | |
3244 | u32 flags) | |
3245 | { | |
3246 | struct dm_pr pr = { | |
3247 | .old_key = old_key, | |
3248 | .new_key = new_key, | |
3249 | .flags = flags, | |
3250 | .fail_early = true, | |
8dd87f3c | 3251 | .ret = 0, |
9c72bad1 CH |
3252 | }; |
3253 | int ret; | |
3254 | ||
3255 | ret = dm_call_pr(bdev, __dm_pr_register, &pr); | |
8dd87f3c MC |
3256 | if (ret) { |
3257 | /* Didn't even get to register a path */ | |
3258 | return ret; | |
9c72bad1 CH |
3259 | } |
3260 | ||
8dd87f3c MC |
3261 | if (!pr.ret) |
3262 | return 0; | |
3263 | ret = pr.ret; | |
3264 | ||
3265 | if (!new_key) | |
3266 | return ret; | |
3267 | ||
3268 | /* unregister all paths if we failed to register any path */ | |
3269 | pr.old_key = new_key; | |
3270 | pr.new_key = 0; | |
3271 | pr.flags = 0; | |
3272 | pr.fail_early = false; | |
3273 | (void) dm_call_pr(bdev, __dm_pr_register, &pr); | |
9c72bad1 | 3274 | return ret; |
71cdb697 CH |
3275 | } |
3276 | ||
70151087 MC |
3277 | |
3278 | static int __dm_pr_reserve(struct dm_target *ti, struct dm_dev *dev, | |
3279 | sector_t start, sector_t len, void *data) | |
3280 | { | |
3281 | struct dm_pr *pr = data; | |
3282 | const struct pr_ops *ops = dev->bdev->bd_disk->fops->pr_ops; | |
3283 | ||
3284 | if (!ops || !ops->pr_reserve) { | |
3285 | pr->ret = -EOPNOTSUPP; | |
3286 | return -1; | |
3287 | } | |
3288 | ||
3289 | pr->ret = ops->pr_reserve(dev->bdev, pr->old_key, pr->type, pr->flags); | |
3290 | if (!pr->ret) | |
3291 | return -1; | |
3292 | ||
3293 | return 0; | |
3294 | } | |
3295 | ||
71cdb697 | 3296 | static int dm_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type, |
956a4025 | 3297 | u32 flags) |
71cdb697 | 3298 | { |
70151087 MC |
3299 | struct dm_pr pr = { |
3300 | .old_key = key, | |
3301 | .flags = flags, | |
3302 | .type = type, | |
3303 | .fail_early = false, | |
3304 | .ret = 0, | |
3305 | }; | |
3306 | int ret; | |
71cdb697 | 3307 | |
70151087 MC |
3308 | ret = dm_call_pr(bdev, __dm_pr_reserve, &pr); |
3309 | if (ret) | |
3310 | return ret; | |
71cdb697 | 3311 | |
70151087 | 3312 | return pr.ret; |
71cdb697 CH |
3313 | } |
3314 | ||
08a3c338 MC |
3315 | /* |
3316 | * If there is a non-All Registrants type of reservation, the release must be | |
3317 | * sent down the holding path. For the cases where there is no reservation or | |
3318 | * the path is not the holder the device will also return success, so we must | |
3319 | * try each path to make sure we got the correct path. | |
3320 | */ | |
3321 | static int __dm_pr_release(struct dm_target *ti, struct dm_dev *dev, | |
3322 | sector_t start, sector_t len, void *data) | |
3323 | { | |
3324 | struct dm_pr *pr = data; | |
3325 | const struct pr_ops *ops = dev->bdev->bd_disk->fops->pr_ops; | |
3326 | ||
3327 | if (!ops || !ops->pr_release) { | |
3328 | pr->ret = -EOPNOTSUPP; | |
3329 | return -1; | |
3330 | } | |
3331 | ||
3332 | pr->ret = ops->pr_release(dev->bdev, pr->old_key, pr->type); | |
3333 | if (pr->ret) | |
3334 | return -1; | |
3335 | ||
3336 | return 0; | |
71cdb697 CH |
3337 | } |
3338 | ||
3339 | static int dm_pr_release(struct block_device *bdev, u64 key, enum pr_type type) | |
3340 | { | |
08a3c338 MC |
3341 | struct dm_pr pr = { |
3342 | .old_key = key, | |
3343 | .type = type, | |
3344 | .fail_early = false, | |
3345 | }; | |
3346 | int ret; | |
71cdb697 | 3347 | |
08a3c338 MC |
3348 | ret = dm_call_pr(bdev, __dm_pr_release, &pr); |
3349 | if (ret) | |
3350 | return ret; | |
71cdb697 | 3351 | |
08a3c338 | 3352 | return pr.ret; |
71cdb697 CH |
3353 | } |
3354 | ||
c6adada5 MC |
3355 | static int __dm_pr_preempt(struct dm_target *ti, struct dm_dev *dev, |
3356 | sector_t start, sector_t len, void *data) | |
3357 | { | |
3358 | struct dm_pr *pr = data; | |
3359 | const struct pr_ops *ops = dev->bdev->bd_disk->fops->pr_ops; | |
3360 | ||
3361 | if (!ops || !ops->pr_preempt) { | |
3362 | pr->ret = -EOPNOTSUPP; | |
3363 | return -1; | |
3364 | } | |
3365 | ||
3366 | pr->ret = ops->pr_preempt(dev->bdev, pr->old_key, pr->new_key, pr->type, | |
3367 | pr->abort); | |
3368 | if (!pr->ret) | |
3369 | return -1; | |
3370 | ||
3371 | return 0; | |
71cdb697 CH |
3372 | } |
3373 | ||
3374 | static int dm_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key, | |
956a4025 | 3375 | enum pr_type type, bool abort) |
71cdb697 | 3376 | { |
c6adada5 MC |
3377 | struct dm_pr pr = { |
3378 | .new_key = new_key, | |
3379 | .old_key = old_key, | |
3380 | .type = type, | |
3381 | .fail_early = false, | |
3382 | }; | |
3383 | int ret; | |
71cdb697 | 3384 | |
c6adada5 MC |
3385 | ret = dm_call_pr(bdev, __dm_pr_preempt, &pr); |
3386 | if (ret) | |
3387 | return ret; | |
71cdb697 | 3388 | |
c6adada5 | 3389 | return pr.ret; |
71cdb697 CH |
3390 | } |
3391 | ||
3392 | static int dm_pr_clear(struct block_device *bdev, u64 key) | |
3393 | { | |
3394 | struct mapped_device *md = bdev->bd_disk->private_data; | |
3395 | const struct pr_ops *ops; | |
971888c4 | 3396 | int r, srcu_idx; |
71cdb697 | 3397 | |
5bd5e8d8 | 3398 | r = dm_prepare_ioctl(md, &srcu_idx, &bdev); |
71cdb697 | 3399 | if (r < 0) |
971888c4 | 3400 | goto out; |
71cdb697 CH |
3401 | |
3402 | ops = bdev->bd_disk->fops->pr_ops; | |
3403 | if (ops && ops->pr_clear) | |
3404 | r = ops->pr_clear(bdev, key); | |
3405 | else | |
3406 | r = -EOPNOTSUPP; | |
971888c4 MS |
3407 | out: |
3408 | dm_unprepare_ioctl(md, srcu_idx); | |
71cdb697 CH |
3409 | return r; |
3410 | } | |
3411 | ||
8a8da082 MC |
3412 | static int __dm_pr_read_keys(struct dm_target *ti, struct dm_dev *dev, |
3413 | sector_t start, sector_t len, void *data) | |
3414 | { | |
3415 | struct dm_pr *pr = data; | |
3416 | const struct pr_ops *ops = dev->bdev->bd_disk->fops->pr_ops; | |
3417 | ||
3418 | if (!ops || !ops->pr_read_keys) { | |
3419 | pr->ret = -EOPNOTSUPP; | |
3420 | return -1; | |
3421 | } | |
3422 | ||
3423 | pr->ret = ops->pr_read_keys(dev->bdev, pr->read_keys); | |
3424 | if (!pr->ret) | |
3425 | return -1; | |
3426 | ||
3427 | return 0; | |
3428 | } | |
3429 | ||
3430 | static int dm_pr_read_keys(struct block_device *bdev, struct pr_keys *keys) | |
3431 | { | |
3432 | struct dm_pr pr = { | |
3433 | .read_keys = keys, | |
3434 | }; | |
3435 | int ret; | |
3436 | ||
3437 | ret = dm_call_pr(bdev, __dm_pr_read_keys, &pr); | |
3438 | if (ret) | |
3439 | return ret; | |
3440 | ||
3441 | return pr.ret; | |
3442 | } | |
3443 | ||
3444 | static int __dm_pr_read_reservation(struct dm_target *ti, struct dm_dev *dev, | |
3445 | sector_t start, sector_t len, void *data) | |
3446 | { | |
3447 | struct dm_pr *pr = data; | |
3448 | const struct pr_ops *ops = dev->bdev->bd_disk->fops->pr_ops; | |
3449 | ||
3450 | if (!ops || !ops->pr_read_reservation) { | |
3451 | pr->ret = -EOPNOTSUPP; | |
3452 | return -1; | |
3453 | } | |
3454 | ||
3455 | pr->ret = ops->pr_read_reservation(dev->bdev, pr->rsv); | |
3456 | if (!pr->ret) | |
3457 | return -1; | |
3458 | ||
3459 | return 0; | |
3460 | } | |
3461 | ||
3462 | static int dm_pr_read_reservation(struct block_device *bdev, | |
3463 | struct pr_held_reservation *rsv) | |
3464 | { | |
3465 | struct dm_pr pr = { | |
3466 | .rsv = rsv, | |
3467 | }; | |
3468 | int ret; | |
3469 | ||
3470 | ret = dm_call_pr(bdev, __dm_pr_read_reservation, &pr); | |
3471 | if (ret) | |
3472 | return ret; | |
3473 | ||
3474 | return pr.ret; | |
3475 | } | |
3476 | ||
71cdb697 CH |
3477 | static const struct pr_ops dm_pr_ops = { |
3478 | .pr_register = dm_pr_register, | |
3479 | .pr_reserve = dm_pr_reserve, | |
3480 | .pr_release = dm_pr_release, | |
3481 | .pr_preempt = dm_pr_preempt, | |
3482 | .pr_clear = dm_pr_clear, | |
8a8da082 MC |
3483 | .pr_read_keys = dm_pr_read_keys, |
3484 | .pr_read_reservation = dm_pr_read_reservation, | |
71cdb697 CH |
3485 | }; |
3486 | ||
83d5cde4 | 3487 | static const struct block_device_operations dm_blk_dops = { |
c62b37d9 | 3488 | .submit_bio = dm_submit_bio, |
b99fdcdc | 3489 | .poll_bio = dm_poll_bio, |
1da177e4 LT |
3490 | .open = dm_blk_open, |
3491 | .release = dm_blk_close, | |
aa129a22 | 3492 | .ioctl = dm_blk_ioctl, |
3ac51e74 | 3493 | .getgeo = dm_blk_getgeo, |
e76239a3 | 3494 | .report_zones = dm_blk_report_zones, |
71cdb697 | 3495 | .pr_ops = &dm_pr_ops, |
1da177e4 LT |
3496 | .owner = THIS_MODULE |
3497 | }; | |
3498 | ||
681cc5e8 MS |
3499 | static const struct block_device_operations dm_rq_blk_dops = { |
3500 | .open = dm_blk_open, | |
3501 | .release = dm_blk_close, | |
3502 | .ioctl = dm_blk_ioctl, | |
3503 | .getgeo = dm_blk_getgeo, | |
3504 | .pr_ops = &dm_pr_ops, | |
3505 | .owner = THIS_MODULE | |
3506 | }; | |
3507 | ||
f26c5719 DW |
3508 | static const struct dax_operations dm_dax_ops = { |
3509 | .direct_access = dm_dax_direct_access, | |
cdf6cdcd | 3510 | .zero_page_range = dm_dax_zero_page_range, |
047218ec | 3511 | .recovery_write = dm_dax_recovery_write, |
f26c5719 DW |
3512 | }; |
3513 | ||
1da177e4 LT |
3514 | /* |
3515 | * module hooks | |
3516 | */ | |
3517 | module_init(dm_init); | |
3518 | module_exit(dm_exit); | |
3519 | ||
3520 | module_param(major, uint, 0); | |
3521 | MODULE_PARM_DESC(major, "The major number of the device mapper"); | |
f4790826 | 3522 | |
6a808034 | 3523 | module_param(reserved_bio_based_ios, uint, 0644); |
e8603136 MS |
3524 | MODULE_PARM_DESC(reserved_bio_based_ios, "Reserved IOs in bio-based mempools"); |
3525 | ||
6a808034 | 3526 | module_param(dm_numa_node, int, 0644); |
115485e8 MS |
3527 | MODULE_PARM_DESC(dm_numa_node, "NUMA node for DM device memory allocations"); |
3528 | ||
6a808034 | 3529 | module_param(swap_bios, int, 0644); |
a666e5c0 MP |
3530 | MODULE_PARM_DESC(swap_bios, "Maximum allowed inflight swap IOs"); |
3531 | ||
1da177e4 | 3532 | MODULE_DESCRIPTION(DM_NAME " driver"); |
fa34e589 | 3533 | MODULE_AUTHOR("Joe Thornber <dm-devel@lists.linux.dev>"); |
1da177e4 | 3534 | MODULE_LICENSE("GPL"); |