Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2001, 2002 Sistina Software (UK) Limited. | |
784aae73 | 3 | * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
1da177e4 LT |
4 | * |
5 | * This file is released under the GPL. | |
6 | */ | |
7 | ||
4cc96131 MS |
8 | #include "dm-core.h" |
9 | #include "dm-rq.h" | |
51e5b2bd | 10 | #include "dm-uevent.h" |
1da177e4 LT |
11 | |
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
48c9c27b | 14 | #include <linux/mutex.h> |
174cd4b1 | 15 | #include <linux/sched/signal.h> |
1da177e4 LT |
16 | #include <linux/blkpg.h> |
17 | #include <linux/bio.h> | |
1da177e4 | 18 | #include <linux/mempool.h> |
f26c5719 | 19 | #include <linux/dax.h> |
1da177e4 LT |
20 | #include <linux/slab.h> |
21 | #include <linux/idr.h> | |
7e026c8c | 22 | #include <linux/uio.h> |
3ac51e74 | 23 | #include <linux/hdreg.h> |
3f77316d | 24 | #include <linux/delay.h> |
ffcc3936 | 25 | #include <linux/wait.h> |
71cdb697 | 26 | #include <linux/pr.h> |
55782138 | 27 | |
72d94861 AK |
28 | #define DM_MSG_PREFIX "core" |
29 | ||
71a16736 NK |
30 | #ifdef CONFIG_PRINTK |
31 | /* | |
32 | * ratelimit state to be used in DMXXX_LIMIT(). | |
33 | */ | |
34 | DEFINE_RATELIMIT_STATE(dm_ratelimit_state, | |
35 | DEFAULT_RATELIMIT_INTERVAL, | |
36 | DEFAULT_RATELIMIT_BURST); | |
37 | EXPORT_SYMBOL(dm_ratelimit_state); | |
38 | #endif | |
39 | ||
60935eb2 MB |
40 | /* |
41 | * Cookies are numeric values sent with CHANGE and REMOVE | |
42 | * uevents while resuming, removing or renaming the device. | |
43 | */ | |
44 | #define DM_COOKIE_ENV_VAR_NAME "DM_COOKIE" | |
45 | #define DM_COOKIE_LENGTH 24 | |
46 | ||
1da177e4 LT |
47 | static const char *_name = DM_NAME; |
48 | ||
49 | static unsigned int major = 0; | |
50 | static unsigned int _major = 0; | |
51 | ||
d15b774c AK |
52 | static DEFINE_IDR(_minor_idr); |
53 | ||
f32c10b0 | 54 | static DEFINE_SPINLOCK(_minor_lock); |
2c140a24 MP |
55 | |
56 | static void do_deferred_remove(struct work_struct *w); | |
57 | ||
58 | static DECLARE_WORK(deferred_remove_work, do_deferred_remove); | |
59 | ||
acfe0ad7 MP |
60 | static struct workqueue_struct *deferred_remove_workqueue; |
61 | ||
93e6442c MP |
62 | atomic_t dm_global_event_nr = ATOMIC_INIT(0); |
63 | DECLARE_WAIT_QUEUE_HEAD(dm_global_eventq); | |
64 | ||
1da177e4 LT |
65 | /* |
66 | * One of these is allocated per bio. | |
67 | */ | |
68 | struct dm_io { | |
69 | struct mapped_device *md; | |
4e4cbee9 | 70 | blk_status_t status; |
1da177e4 | 71 | atomic_t io_count; |
6ae2fa67 | 72 | struct bio *bio; |
3eaf840e | 73 | unsigned long start_time; |
f88fb981 | 74 | spinlock_t endio_lock; |
fd2ed4d2 | 75 | struct dm_stats_aux stats_aux; |
1da177e4 LT |
76 | }; |
77 | ||
ba61fdd1 JM |
78 | #define MINOR_ALLOCED ((void *)-1) |
79 | ||
1da177e4 LT |
80 | /* |
81 | * Bits for the md->flags field. | |
82 | */ | |
1eb787ec | 83 | #define DMF_BLOCK_IO_FOR_SUSPEND 0 |
1da177e4 | 84 | #define DMF_SUSPENDED 1 |
aa8d7c2f | 85 | #define DMF_FROZEN 2 |
fba9f90e | 86 | #define DMF_FREEING 3 |
5c6bd75d | 87 | #define DMF_DELETING 4 |
2e93ccc1 | 88 | #define DMF_NOFLUSH_SUSPENDING 5 |
8ae12666 KO |
89 | #define DMF_DEFERRED_REMOVE 6 |
90 | #define DMF_SUSPENDED_INTERNALLY 7 | |
1da177e4 | 91 | |
115485e8 | 92 | #define DM_NUMA_NODE NUMA_NO_NODE |
115485e8 | 93 | static int dm_numa_node = DM_NUMA_NODE; |
faad87df | 94 | |
e6ee8c0b KU |
95 | /* |
96 | * For mempools pre-allocation at the table loading time. | |
97 | */ | |
98 | struct dm_md_mempools { | |
99 | mempool_t *io_pool; | |
e6ee8c0b KU |
100 | struct bio_set *bs; |
101 | }; | |
102 | ||
86f1152b BM |
103 | struct table_device { |
104 | struct list_head list; | |
105 | atomic_t count; | |
106 | struct dm_dev dm_dev; | |
107 | }; | |
108 | ||
e18b890b | 109 | static struct kmem_cache *_io_cache; |
8fbf26ad | 110 | static struct kmem_cache *_rq_tio_cache; |
1ae49ea2 | 111 | static struct kmem_cache *_rq_cache; |
94818742 | 112 | |
e8603136 MS |
113 | /* |
114 | * Bio-based DM's mempools' reserved IOs set by the user. | |
115 | */ | |
4cc96131 | 116 | #define RESERVED_BIO_BASED_IOS 16 |
e8603136 MS |
117 | static unsigned reserved_bio_based_ios = RESERVED_BIO_BASED_IOS; |
118 | ||
115485e8 MS |
119 | static int __dm_get_module_param_int(int *module_param, int min, int max) |
120 | { | |
121 | int param = ACCESS_ONCE(*module_param); | |
122 | int modified_param = 0; | |
123 | bool modified = true; | |
124 | ||
125 | if (param < min) | |
126 | modified_param = min; | |
127 | else if (param > max) | |
128 | modified_param = max; | |
129 | else | |
130 | modified = false; | |
131 | ||
132 | if (modified) { | |
133 | (void)cmpxchg(module_param, param, modified_param); | |
134 | param = modified_param; | |
135 | } | |
136 | ||
137 | return param; | |
138 | } | |
139 | ||
4cc96131 MS |
140 | unsigned __dm_get_module_param(unsigned *module_param, |
141 | unsigned def, unsigned max) | |
f4790826 | 142 | { |
09c2d531 MS |
143 | unsigned param = ACCESS_ONCE(*module_param); |
144 | unsigned modified_param = 0; | |
f4790826 | 145 | |
09c2d531 MS |
146 | if (!param) |
147 | modified_param = def; | |
148 | else if (param > max) | |
149 | modified_param = max; | |
f4790826 | 150 | |
09c2d531 MS |
151 | if (modified_param) { |
152 | (void)cmpxchg(module_param, param, modified_param); | |
153 | param = modified_param; | |
f4790826 MS |
154 | } |
155 | ||
09c2d531 | 156 | return param; |
f4790826 MS |
157 | } |
158 | ||
e8603136 MS |
159 | unsigned dm_get_reserved_bio_based_ios(void) |
160 | { | |
09c2d531 | 161 | return __dm_get_module_param(&reserved_bio_based_ios, |
4cc96131 | 162 | RESERVED_BIO_BASED_IOS, DM_RESERVED_MAX_IOS); |
e8603136 MS |
163 | } |
164 | EXPORT_SYMBOL_GPL(dm_get_reserved_bio_based_ios); | |
165 | ||
115485e8 MS |
166 | static unsigned dm_get_numa_node(void) |
167 | { | |
168 | return __dm_get_module_param_int(&dm_numa_node, | |
169 | DM_NUMA_NODE, num_online_nodes() - 1); | |
170 | } | |
171 | ||
1da177e4 LT |
172 | static int __init local_init(void) |
173 | { | |
51157b4a | 174 | int r = -ENOMEM; |
1da177e4 | 175 | |
1da177e4 | 176 | /* allocate a slab for the dm_ios */ |
028867ac | 177 | _io_cache = KMEM_CACHE(dm_io, 0); |
1da177e4 | 178 | if (!_io_cache) |
51157b4a | 179 | return r; |
1da177e4 | 180 | |
8fbf26ad KU |
181 | _rq_tio_cache = KMEM_CACHE(dm_rq_target_io, 0); |
182 | if (!_rq_tio_cache) | |
dba14160 | 183 | goto out_free_io_cache; |
8fbf26ad | 184 | |
eca7ee6d | 185 | _rq_cache = kmem_cache_create("dm_old_clone_request", sizeof(struct request), |
1ae49ea2 MS |
186 | __alignof__(struct request), 0, NULL); |
187 | if (!_rq_cache) | |
188 | goto out_free_rq_tio_cache; | |
189 | ||
51e5b2bd | 190 | r = dm_uevent_init(); |
51157b4a | 191 | if (r) |
1ae49ea2 | 192 | goto out_free_rq_cache; |
51e5b2bd | 193 | |
acfe0ad7 MP |
194 | deferred_remove_workqueue = alloc_workqueue("kdmremove", WQ_UNBOUND, 1); |
195 | if (!deferred_remove_workqueue) { | |
196 | r = -ENOMEM; | |
197 | goto out_uevent_exit; | |
198 | } | |
199 | ||
1da177e4 LT |
200 | _major = major; |
201 | r = register_blkdev(_major, _name); | |
51157b4a | 202 | if (r < 0) |
acfe0ad7 | 203 | goto out_free_workqueue; |
1da177e4 LT |
204 | |
205 | if (!_major) | |
206 | _major = r; | |
207 | ||
208 | return 0; | |
51157b4a | 209 | |
acfe0ad7 MP |
210 | out_free_workqueue: |
211 | destroy_workqueue(deferred_remove_workqueue); | |
51157b4a KU |
212 | out_uevent_exit: |
213 | dm_uevent_exit(); | |
1ae49ea2 MS |
214 | out_free_rq_cache: |
215 | kmem_cache_destroy(_rq_cache); | |
8fbf26ad KU |
216 | out_free_rq_tio_cache: |
217 | kmem_cache_destroy(_rq_tio_cache); | |
51157b4a KU |
218 | out_free_io_cache: |
219 | kmem_cache_destroy(_io_cache); | |
220 | ||
221 | return r; | |
1da177e4 LT |
222 | } |
223 | ||
224 | static void local_exit(void) | |
225 | { | |
2c140a24 | 226 | flush_scheduled_work(); |
acfe0ad7 | 227 | destroy_workqueue(deferred_remove_workqueue); |
2c140a24 | 228 | |
1ae49ea2 | 229 | kmem_cache_destroy(_rq_cache); |
8fbf26ad | 230 | kmem_cache_destroy(_rq_tio_cache); |
1da177e4 | 231 | kmem_cache_destroy(_io_cache); |
00d59405 | 232 | unregister_blkdev(_major, _name); |
51e5b2bd | 233 | dm_uevent_exit(); |
1da177e4 LT |
234 | |
235 | _major = 0; | |
236 | ||
237 | DMINFO("cleaned up"); | |
238 | } | |
239 | ||
b9249e55 | 240 | static int (*_inits[])(void) __initdata = { |
1da177e4 LT |
241 | local_init, |
242 | dm_target_init, | |
243 | dm_linear_init, | |
244 | dm_stripe_init, | |
952b3557 | 245 | dm_io_init, |
945fa4d2 | 246 | dm_kcopyd_init, |
1da177e4 | 247 | dm_interface_init, |
fd2ed4d2 | 248 | dm_statistics_init, |
1da177e4 LT |
249 | }; |
250 | ||
b9249e55 | 251 | static void (*_exits[])(void) = { |
1da177e4 LT |
252 | local_exit, |
253 | dm_target_exit, | |
254 | dm_linear_exit, | |
255 | dm_stripe_exit, | |
952b3557 | 256 | dm_io_exit, |
945fa4d2 | 257 | dm_kcopyd_exit, |
1da177e4 | 258 | dm_interface_exit, |
fd2ed4d2 | 259 | dm_statistics_exit, |
1da177e4 LT |
260 | }; |
261 | ||
262 | static int __init dm_init(void) | |
263 | { | |
264 | const int count = ARRAY_SIZE(_inits); | |
265 | ||
266 | int r, i; | |
267 | ||
268 | for (i = 0; i < count; i++) { | |
269 | r = _inits[i](); | |
270 | if (r) | |
271 | goto bad; | |
272 | } | |
273 | ||
274 | return 0; | |
275 | ||
276 | bad: | |
277 | while (i--) | |
278 | _exits[i](); | |
279 | ||
280 | return r; | |
281 | } | |
282 | ||
283 | static void __exit dm_exit(void) | |
284 | { | |
285 | int i = ARRAY_SIZE(_exits); | |
286 | ||
287 | while (i--) | |
288 | _exits[i](); | |
d15b774c AK |
289 | |
290 | /* | |
291 | * Should be empty by this point. | |
292 | */ | |
d15b774c | 293 | idr_destroy(&_minor_idr); |
1da177e4 LT |
294 | } |
295 | ||
296 | /* | |
297 | * Block device functions | |
298 | */ | |
432a212c MA |
299 | int dm_deleting_md(struct mapped_device *md) |
300 | { | |
301 | return test_bit(DMF_DELETING, &md->flags); | |
302 | } | |
303 | ||
fe5f9f2c | 304 | static int dm_blk_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
305 | { |
306 | struct mapped_device *md; | |
307 | ||
fba9f90e JM |
308 | spin_lock(&_minor_lock); |
309 | ||
fe5f9f2c | 310 | md = bdev->bd_disk->private_data; |
fba9f90e JM |
311 | if (!md) |
312 | goto out; | |
313 | ||
5c6bd75d | 314 | if (test_bit(DMF_FREEING, &md->flags) || |
432a212c | 315 | dm_deleting_md(md)) { |
fba9f90e JM |
316 | md = NULL; |
317 | goto out; | |
318 | } | |
319 | ||
1da177e4 | 320 | dm_get(md); |
5c6bd75d | 321 | atomic_inc(&md->open_count); |
fba9f90e JM |
322 | out: |
323 | spin_unlock(&_minor_lock); | |
324 | ||
325 | return md ? 0 : -ENXIO; | |
1da177e4 LT |
326 | } |
327 | ||
db2a144b | 328 | static void dm_blk_close(struct gendisk *disk, fmode_t mode) |
1da177e4 | 329 | { |
63a4f065 | 330 | struct mapped_device *md; |
6e9624b8 | 331 | |
4a1aeb98 MB |
332 | spin_lock(&_minor_lock); |
333 | ||
63a4f065 MS |
334 | md = disk->private_data; |
335 | if (WARN_ON(!md)) | |
336 | goto out; | |
337 | ||
2c140a24 MP |
338 | if (atomic_dec_and_test(&md->open_count) && |
339 | (test_bit(DMF_DEFERRED_REMOVE, &md->flags))) | |
acfe0ad7 | 340 | queue_work(deferred_remove_workqueue, &deferred_remove_work); |
2c140a24 | 341 | |
1da177e4 | 342 | dm_put(md); |
63a4f065 | 343 | out: |
4a1aeb98 | 344 | spin_unlock(&_minor_lock); |
1da177e4 LT |
345 | } |
346 | ||
5c6bd75d AK |
347 | int dm_open_count(struct mapped_device *md) |
348 | { | |
349 | return atomic_read(&md->open_count); | |
350 | } | |
351 | ||
352 | /* | |
353 | * Guarantees nothing is using the device before it's deleted. | |
354 | */ | |
2c140a24 | 355 | int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred) |
5c6bd75d AK |
356 | { |
357 | int r = 0; | |
358 | ||
359 | spin_lock(&_minor_lock); | |
360 | ||
2c140a24 | 361 | if (dm_open_count(md)) { |
5c6bd75d | 362 | r = -EBUSY; |
2c140a24 MP |
363 | if (mark_deferred) |
364 | set_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
365 | } else if (only_deferred && !test_bit(DMF_DEFERRED_REMOVE, &md->flags)) | |
366 | r = -EEXIST; | |
5c6bd75d AK |
367 | else |
368 | set_bit(DMF_DELETING, &md->flags); | |
369 | ||
370 | spin_unlock(&_minor_lock); | |
371 | ||
372 | return r; | |
373 | } | |
374 | ||
2c140a24 MP |
375 | int dm_cancel_deferred_remove(struct mapped_device *md) |
376 | { | |
377 | int r = 0; | |
378 | ||
379 | spin_lock(&_minor_lock); | |
380 | ||
381 | if (test_bit(DMF_DELETING, &md->flags)) | |
382 | r = -EBUSY; | |
383 | else | |
384 | clear_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
385 | ||
386 | spin_unlock(&_minor_lock); | |
387 | ||
388 | return r; | |
389 | } | |
390 | ||
391 | static void do_deferred_remove(struct work_struct *w) | |
392 | { | |
393 | dm_deferred_remove(); | |
394 | } | |
395 | ||
fd2ed4d2 MP |
396 | sector_t dm_get_size(struct mapped_device *md) |
397 | { | |
398 | return get_capacity(md->disk); | |
399 | } | |
400 | ||
9974fa2c MS |
401 | struct request_queue *dm_get_md_queue(struct mapped_device *md) |
402 | { | |
403 | return md->queue; | |
404 | } | |
405 | ||
fd2ed4d2 MP |
406 | struct dm_stats *dm_get_stats(struct mapped_device *md) |
407 | { | |
408 | return &md->stats; | |
409 | } | |
410 | ||
3ac51e74 DW |
411 | static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
412 | { | |
413 | struct mapped_device *md = bdev->bd_disk->private_data; | |
414 | ||
415 | return dm_get_geometry(md, geo); | |
416 | } | |
417 | ||
956a4025 MS |
418 | static int dm_grab_bdev_for_ioctl(struct mapped_device *md, |
419 | struct block_device **bdev, | |
420 | fmode_t *mode) | |
aa129a22 | 421 | { |
66482026 | 422 | struct dm_target *tgt; |
6c182cd8 | 423 | struct dm_table *map; |
956a4025 | 424 | int srcu_idx, r; |
aa129a22 | 425 | |
6c182cd8 | 426 | retry: |
e56f81e0 | 427 | r = -ENOTTY; |
956a4025 | 428 | map = dm_get_live_table(md, &srcu_idx); |
aa129a22 MB |
429 | if (!map || !dm_table_get_size(map)) |
430 | goto out; | |
431 | ||
432 | /* We only support devices that have a single target */ | |
433 | if (dm_table_get_num_targets(map) != 1) | |
434 | goto out; | |
435 | ||
66482026 MS |
436 | tgt = dm_table_get_target(map, 0); |
437 | if (!tgt->type->prepare_ioctl) | |
4d341d82 | 438 | goto out; |
aa129a22 | 439 | |
4f186f8b | 440 | if (dm_suspended_md(md)) { |
aa129a22 MB |
441 | r = -EAGAIN; |
442 | goto out; | |
443 | } | |
444 | ||
66482026 | 445 | r = tgt->type->prepare_ioctl(tgt, bdev, mode); |
e56f81e0 CH |
446 | if (r < 0) |
447 | goto out; | |
aa129a22 | 448 | |
956a4025 MS |
449 | bdgrab(*bdev); |
450 | dm_put_live_table(md, srcu_idx); | |
e56f81e0 | 451 | return r; |
aa129a22 | 452 | |
aa129a22 | 453 | out: |
956a4025 | 454 | dm_put_live_table(md, srcu_idx); |
5bbbfdf6 | 455 | if (r == -ENOTCONN && !fatal_signal_pending(current)) { |
6c182cd8 HR |
456 | msleep(10); |
457 | goto retry; | |
458 | } | |
e56f81e0 CH |
459 | return r; |
460 | } | |
461 | ||
462 | static int dm_blk_ioctl(struct block_device *bdev, fmode_t mode, | |
463 | unsigned int cmd, unsigned long arg) | |
464 | { | |
465 | struct mapped_device *md = bdev->bd_disk->private_data; | |
956a4025 | 466 | int r; |
e56f81e0 | 467 | |
956a4025 | 468 | r = dm_grab_bdev_for_ioctl(md, &bdev, &mode); |
e56f81e0 CH |
469 | if (r < 0) |
470 | return r; | |
6c182cd8 | 471 | |
e56f81e0 CH |
472 | if (r > 0) { |
473 | /* | |
e980f623 CH |
474 | * Target determined this ioctl is being issued against a |
475 | * subset of the parent bdev; require extra privileges. | |
e56f81e0 | 476 | */ |
e980f623 CH |
477 | if (!capable(CAP_SYS_RAWIO)) { |
478 | DMWARN_LIMIT( | |
479 | "%s: sending ioctl %x to DM device without required privilege.", | |
480 | current->comm, cmd); | |
481 | r = -ENOIOCTLCMD; | |
e56f81e0 | 482 | goto out; |
e980f623 | 483 | } |
e56f81e0 | 484 | } |
6c182cd8 | 485 | |
66482026 | 486 | r = __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
e56f81e0 | 487 | out: |
956a4025 | 488 | bdput(bdev); |
aa129a22 MB |
489 | return r; |
490 | } | |
491 | ||
028867ac | 492 | static struct dm_io *alloc_io(struct mapped_device *md) |
1da177e4 LT |
493 | { |
494 | return mempool_alloc(md->io_pool, GFP_NOIO); | |
495 | } | |
496 | ||
028867ac | 497 | static void free_io(struct mapped_device *md, struct dm_io *io) |
1da177e4 LT |
498 | { |
499 | mempool_free(io, md->io_pool); | |
500 | } | |
501 | ||
cfae7529 | 502 | static void free_tio(struct dm_target_io *tio) |
1da177e4 | 503 | { |
dba14160 | 504 | bio_put(&tio->clone); |
1da177e4 LT |
505 | } |
506 | ||
4cc96131 | 507 | int md_in_flight(struct mapped_device *md) |
90abb8c4 KU |
508 | { |
509 | return atomic_read(&md->pending[READ]) + | |
510 | atomic_read(&md->pending[WRITE]); | |
511 | } | |
512 | ||
3eaf840e JNN |
513 | static void start_io_acct(struct dm_io *io) |
514 | { | |
515 | struct mapped_device *md = io->md; | |
fd2ed4d2 | 516 | struct bio *bio = io->bio; |
c9959059 | 517 | int cpu; |
fd2ed4d2 | 518 | int rw = bio_data_dir(bio); |
3eaf840e JNN |
519 | |
520 | io->start_time = jiffies; | |
521 | ||
074a7aca | 522 | cpu = part_stat_lock(); |
d62e26b3 | 523 | part_round_stats(md->queue, cpu, &dm_disk(md)->part0); |
074a7aca | 524 | part_stat_unlock(); |
1e9bb880 SL |
525 | atomic_set(&dm_disk(md)->part0.in_flight[rw], |
526 | atomic_inc_return(&md->pending[rw])); | |
fd2ed4d2 MP |
527 | |
528 | if (unlikely(dm_stats_used(&md->stats))) | |
528ec5ab MC |
529 | dm_stats_account_io(&md->stats, bio_data_dir(bio), |
530 | bio->bi_iter.bi_sector, bio_sectors(bio), | |
531 | false, 0, &io->stats_aux); | |
3eaf840e JNN |
532 | } |
533 | ||
d221d2e7 | 534 | static void end_io_acct(struct dm_io *io) |
3eaf840e JNN |
535 | { |
536 | struct mapped_device *md = io->md; | |
537 | struct bio *bio = io->bio; | |
538 | unsigned long duration = jiffies - io->start_time; | |
18c0b223 | 539 | int pending; |
3eaf840e JNN |
540 | int rw = bio_data_dir(bio); |
541 | ||
d62e26b3 | 542 | generic_end_io_acct(md->queue, rw, &dm_disk(md)->part0, io->start_time); |
3eaf840e | 543 | |
fd2ed4d2 | 544 | if (unlikely(dm_stats_used(&md->stats))) |
528ec5ab MC |
545 | dm_stats_account_io(&md->stats, bio_data_dir(bio), |
546 | bio->bi_iter.bi_sector, bio_sectors(bio), | |
547 | true, duration, &io->stats_aux); | |
fd2ed4d2 | 548 | |
af7e466a MP |
549 | /* |
550 | * After this is decremented the bio must not be touched if it is | |
d87f4c14 | 551 | * a flush. |
af7e466a | 552 | */ |
1e9bb880 SL |
553 | pending = atomic_dec_return(&md->pending[rw]); |
554 | atomic_set(&dm_disk(md)->part0.in_flight[rw], pending); | |
316d315b | 555 | pending += atomic_read(&md->pending[rw^0x1]); |
3eaf840e | 556 | |
d221d2e7 MP |
557 | /* nudge anyone waiting on suspend queue */ |
558 | if (!pending) | |
559 | wake_up(&md->wait); | |
3eaf840e JNN |
560 | } |
561 | ||
1da177e4 LT |
562 | /* |
563 | * Add the bio to the list of deferred io. | |
564 | */ | |
92c63902 | 565 | static void queue_io(struct mapped_device *md, struct bio *bio) |
1da177e4 | 566 | { |
05447420 | 567 | unsigned long flags; |
1da177e4 | 568 | |
05447420 | 569 | spin_lock_irqsave(&md->deferred_lock, flags); |
1da177e4 | 570 | bio_list_add(&md->deferred, bio); |
05447420 | 571 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
6a8736d1 | 572 | queue_work(md->wq, &md->work); |
1da177e4 LT |
573 | } |
574 | ||
575 | /* | |
576 | * Everyone (including functions in this file), should use this | |
577 | * function to access the md->map field, and make sure they call | |
83d5e5b0 | 578 | * dm_put_live_table() when finished. |
1da177e4 | 579 | */ |
83d5e5b0 | 580 | struct dm_table *dm_get_live_table(struct mapped_device *md, int *srcu_idx) __acquires(md->io_barrier) |
1da177e4 | 581 | { |
83d5e5b0 MP |
582 | *srcu_idx = srcu_read_lock(&md->io_barrier); |
583 | ||
584 | return srcu_dereference(md->map, &md->io_barrier); | |
585 | } | |
1da177e4 | 586 | |
83d5e5b0 MP |
587 | void dm_put_live_table(struct mapped_device *md, int srcu_idx) __releases(md->io_barrier) |
588 | { | |
589 | srcu_read_unlock(&md->io_barrier, srcu_idx); | |
590 | } | |
591 | ||
592 | void dm_sync_table(struct mapped_device *md) | |
593 | { | |
594 | synchronize_srcu(&md->io_barrier); | |
595 | synchronize_rcu_expedited(); | |
596 | } | |
597 | ||
598 | /* | |
599 | * A fast alternative to dm_get_live_table/dm_put_live_table. | |
600 | * The caller must not block between these two functions. | |
601 | */ | |
602 | static struct dm_table *dm_get_live_table_fast(struct mapped_device *md) __acquires(RCU) | |
603 | { | |
604 | rcu_read_lock(); | |
605 | return rcu_dereference(md->map); | |
606 | } | |
1da177e4 | 607 | |
83d5e5b0 MP |
608 | static void dm_put_live_table_fast(struct mapped_device *md) __releases(RCU) |
609 | { | |
610 | rcu_read_unlock(); | |
1da177e4 LT |
611 | } |
612 | ||
86f1152b BM |
613 | /* |
614 | * Open a table device so we can use it as a map destination. | |
615 | */ | |
616 | static int open_table_device(struct table_device *td, dev_t dev, | |
617 | struct mapped_device *md) | |
618 | { | |
619 | static char *_claim_ptr = "I belong to device-mapper"; | |
620 | struct block_device *bdev; | |
621 | ||
622 | int r; | |
623 | ||
624 | BUG_ON(td->dm_dev.bdev); | |
625 | ||
626 | bdev = blkdev_get_by_dev(dev, td->dm_dev.mode | FMODE_EXCL, _claim_ptr); | |
627 | if (IS_ERR(bdev)) | |
628 | return PTR_ERR(bdev); | |
629 | ||
630 | r = bd_link_disk_holder(bdev, dm_disk(md)); | |
631 | if (r) { | |
632 | blkdev_put(bdev, td->dm_dev.mode | FMODE_EXCL); | |
633 | return r; | |
634 | } | |
635 | ||
636 | td->dm_dev.bdev = bdev; | |
817bf402 | 637 | td->dm_dev.dax_dev = dax_get_by_host(bdev->bd_disk->disk_name); |
86f1152b BM |
638 | return 0; |
639 | } | |
640 | ||
641 | /* | |
642 | * Close a table device that we've been using. | |
643 | */ | |
644 | static void close_table_device(struct table_device *td, struct mapped_device *md) | |
645 | { | |
646 | if (!td->dm_dev.bdev) | |
647 | return; | |
648 | ||
649 | bd_unlink_disk_holder(td->dm_dev.bdev, dm_disk(md)); | |
650 | blkdev_put(td->dm_dev.bdev, td->dm_dev.mode | FMODE_EXCL); | |
817bf402 | 651 | put_dax(td->dm_dev.dax_dev); |
86f1152b | 652 | td->dm_dev.bdev = NULL; |
817bf402 | 653 | td->dm_dev.dax_dev = NULL; |
86f1152b BM |
654 | } |
655 | ||
656 | static struct table_device *find_table_device(struct list_head *l, dev_t dev, | |
657 | fmode_t mode) { | |
658 | struct table_device *td; | |
659 | ||
660 | list_for_each_entry(td, l, list) | |
661 | if (td->dm_dev.bdev->bd_dev == dev && td->dm_dev.mode == mode) | |
662 | return td; | |
663 | ||
664 | return NULL; | |
665 | } | |
666 | ||
667 | int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode, | |
668 | struct dm_dev **result) { | |
669 | int r; | |
670 | struct table_device *td; | |
671 | ||
672 | mutex_lock(&md->table_devices_lock); | |
673 | td = find_table_device(&md->table_devices, dev, mode); | |
674 | if (!td) { | |
115485e8 | 675 | td = kmalloc_node(sizeof(*td), GFP_KERNEL, md->numa_node_id); |
86f1152b BM |
676 | if (!td) { |
677 | mutex_unlock(&md->table_devices_lock); | |
678 | return -ENOMEM; | |
679 | } | |
680 | ||
681 | td->dm_dev.mode = mode; | |
682 | td->dm_dev.bdev = NULL; | |
683 | ||
684 | if ((r = open_table_device(td, dev, md))) { | |
685 | mutex_unlock(&md->table_devices_lock); | |
686 | kfree(td); | |
687 | return r; | |
688 | } | |
689 | ||
690 | format_dev_t(td->dm_dev.name, dev); | |
691 | ||
692 | atomic_set(&td->count, 0); | |
693 | list_add(&td->list, &md->table_devices); | |
694 | } | |
695 | atomic_inc(&td->count); | |
696 | mutex_unlock(&md->table_devices_lock); | |
697 | ||
698 | *result = &td->dm_dev; | |
699 | return 0; | |
700 | } | |
701 | EXPORT_SYMBOL_GPL(dm_get_table_device); | |
702 | ||
703 | void dm_put_table_device(struct mapped_device *md, struct dm_dev *d) | |
704 | { | |
705 | struct table_device *td = container_of(d, struct table_device, dm_dev); | |
706 | ||
707 | mutex_lock(&md->table_devices_lock); | |
708 | if (atomic_dec_and_test(&td->count)) { | |
709 | close_table_device(td, md); | |
710 | list_del(&td->list); | |
711 | kfree(td); | |
712 | } | |
713 | mutex_unlock(&md->table_devices_lock); | |
714 | } | |
715 | EXPORT_SYMBOL(dm_put_table_device); | |
716 | ||
717 | static void free_table_devices(struct list_head *devices) | |
718 | { | |
719 | struct list_head *tmp, *next; | |
720 | ||
721 | list_for_each_safe(tmp, next, devices) { | |
722 | struct table_device *td = list_entry(tmp, struct table_device, list); | |
723 | ||
724 | DMWARN("dm_destroy: %s still exists with %d references", | |
725 | td->dm_dev.name, atomic_read(&td->count)); | |
726 | kfree(td); | |
727 | } | |
728 | } | |
729 | ||
3ac51e74 DW |
730 | /* |
731 | * Get the geometry associated with a dm device | |
732 | */ | |
733 | int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo) | |
734 | { | |
735 | *geo = md->geometry; | |
736 | ||
737 | return 0; | |
738 | } | |
739 | ||
740 | /* | |
741 | * Set the geometry of a device. | |
742 | */ | |
743 | int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo) | |
744 | { | |
745 | sector_t sz = (sector_t)geo->cylinders * geo->heads * geo->sectors; | |
746 | ||
747 | if (geo->start > sz) { | |
748 | DMWARN("Start sector is beyond the geometry limits."); | |
749 | return -EINVAL; | |
750 | } | |
751 | ||
752 | md->geometry = *geo; | |
753 | ||
754 | return 0; | |
755 | } | |
756 | ||
1da177e4 LT |
757 | /*----------------------------------------------------------------- |
758 | * CRUD START: | |
759 | * A more elegant soln is in the works that uses the queue | |
760 | * merge fn, unfortunately there are a couple of changes to | |
761 | * the block layer that I want to make for this. So in the | |
762 | * interests of getting something for people to use I give | |
763 | * you this clearly demarcated crap. | |
764 | *---------------------------------------------------------------*/ | |
765 | ||
2e93ccc1 KU |
766 | static int __noflush_suspending(struct mapped_device *md) |
767 | { | |
768 | return test_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); | |
769 | } | |
770 | ||
1da177e4 LT |
771 | /* |
772 | * Decrements the number of outstanding ios that a bio has been | |
773 | * cloned into, completing the original io if necc. | |
774 | */ | |
4e4cbee9 | 775 | static void dec_pending(struct dm_io *io, blk_status_t error) |
1da177e4 | 776 | { |
2e93ccc1 | 777 | unsigned long flags; |
4e4cbee9 | 778 | blk_status_t io_error; |
b35f8caa MB |
779 | struct bio *bio; |
780 | struct mapped_device *md = io->md; | |
2e93ccc1 KU |
781 | |
782 | /* Push-back supersedes any I/O errors */ | |
f88fb981 KU |
783 | if (unlikely(error)) { |
784 | spin_lock_irqsave(&io->endio_lock, flags); | |
4e4cbee9 CH |
785 | if (!(io->status == BLK_STS_DM_REQUEUE && |
786 | __noflush_suspending(md))) | |
787 | io->status = error; | |
f88fb981 KU |
788 | spin_unlock_irqrestore(&io->endio_lock, flags); |
789 | } | |
1da177e4 LT |
790 | |
791 | if (atomic_dec_and_test(&io->io_count)) { | |
4e4cbee9 | 792 | if (io->status == BLK_STS_DM_REQUEUE) { |
2e93ccc1 KU |
793 | /* |
794 | * Target requested pushing back the I/O. | |
2e93ccc1 | 795 | */ |
022c2611 | 796 | spin_lock_irqsave(&md->deferred_lock, flags); |
6a8736d1 TH |
797 | if (__noflush_suspending(md)) |
798 | bio_list_add_head(&md->deferred, io->bio); | |
799 | else | |
2e93ccc1 | 800 | /* noflush suspend was interrupted. */ |
4e4cbee9 | 801 | io->status = BLK_STS_IOERR; |
022c2611 | 802 | spin_unlock_irqrestore(&md->deferred_lock, flags); |
2e93ccc1 KU |
803 | } |
804 | ||
4e4cbee9 | 805 | io_error = io->status; |
b35f8caa | 806 | bio = io->bio; |
6a8736d1 TH |
807 | end_io_acct(io); |
808 | free_io(md, io); | |
809 | ||
4e4cbee9 | 810 | if (io_error == BLK_STS_DM_REQUEUE) |
6a8736d1 | 811 | return; |
2e93ccc1 | 812 | |
1eff9d32 | 813 | if ((bio->bi_opf & REQ_PREFLUSH) && bio->bi_iter.bi_size) { |
af7e466a | 814 | /* |
6a8736d1 | 815 | * Preflush done for flush with data, reissue |
28a8f0d3 | 816 | * without REQ_PREFLUSH. |
af7e466a | 817 | */ |
1eff9d32 | 818 | bio->bi_opf &= ~REQ_PREFLUSH; |
6a8736d1 | 819 | queue_io(md, bio); |
af7e466a | 820 | } else { |
b372d360 | 821 | /* done with normal IO or empty flush */ |
4e4cbee9 | 822 | bio->bi_status = io_error; |
4246a0b6 | 823 | bio_endio(bio); |
b35f8caa | 824 | } |
1da177e4 LT |
825 | } |
826 | } | |
827 | ||
4cc96131 | 828 | void disable_write_same(struct mapped_device *md) |
7eee4ae2 MS |
829 | { |
830 | struct queue_limits *limits = dm_get_queue_limits(md); | |
831 | ||
832 | /* device doesn't really support WRITE SAME, disable it */ | |
833 | limits->max_write_same_sectors = 0; | |
834 | } | |
835 | ||
ac62d620 CH |
836 | void disable_write_zeroes(struct mapped_device *md) |
837 | { | |
838 | struct queue_limits *limits = dm_get_queue_limits(md); | |
839 | ||
840 | /* device doesn't really support WRITE ZEROES, disable it */ | |
841 | limits->max_write_zeroes_sectors = 0; | |
842 | } | |
843 | ||
4246a0b6 | 844 | static void clone_endio(struct bio *bio) |
1da177e4 | 845 | { |
4e4cbee9 | 846 | blk_status_t error = bio->bi_status; |
bfc6d41c | 847 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); |
b35f8caa | 848 | struct dm_io *io = tio->io; |
9faf400f | 849 | struct mapped_device *md = tio->io->md; |
1da177e4 LT |
850 | dm_endio_fn endio = tio->ti->type->end_io; |
851 | ||
4e4cbee9 | 852 | if (unlikely(error == BLK_STS_TARGET)) { |
ac62d620 | 853 | if (bio_op(bio) == REQ_OP_WRITE_SAME && |
74d46992 | 854 | !bio->bi_disk->queue->limits.max_write_same_sectors) |
ac62d620 CH |
855 | disable_write_same(md); |
856 | if (bio_op(bio) == REQ_OP_WRITE_ZEROES && | |
74d46992 | 857 | !bio->bi_disk->queue->limits.max_write_zeroes_sectors) |
ac62d620 CH |
858 | disable_write_zeroes(md); |
859 | } | |
7eee4ae2 | 860 | |
1be56909 | 861 | if (endio) { |
4e4cbee9 | 862 | int r = endio(tio->ti, bio, &error); |
1be56909 CH |
863 | switch (r) { |
864 | case DM_ENDIO_REQUEUE: | |
4e4cbee9 | 865 | error = BLK_STS_DM_REQUEUE; |
1be56909 CH |
866 | /*FALLTHRU*/ |
867 | case DM_ENDIO_DONE: | |
868 | break; | |
869 | case DM_ENDIO_INCOMPLETE: | |
870 | /* The target will handle the io */ | |
871 | return; | |
872 | default: | |
873 | DMWARN("unimplemented target endio return value: %d", r); | |
874 | BUG(); | |
875 | } | |
876 | } | |
877 | ||
cfae7529 | 878 | free_tio(tio); |
b35f8caa | 879 | dec_pending(io, error); |
1da177e4 LT |
880 | } |
881 | ||
56a67df7 MS |
882 | /* |
883 | * Return maximum size of I/O possible at the supplied sector up to the current | |
884 | * target boundary. | |
885 | */ | |
886 | static sector_t max_io_len_target_boundary(sector_t sector, struct dm_target *ti) | |
887 | { | |
888 | sector_t target_offset = dm_target_offset(ti, sector); | |
889 | ||
890 | return ti->len - target_offset; | |
891 | } | |
892 | ||
893 | static sector_t max_io_len(sector_t sector, struct dm_target *ti) | |
1da177e4 | 894 | { |
56a67df7 | 895 | sector_t len = max_io_len_target_boundary(sector, ti); |
542f9038 | 896 | sector_t offset, max_len; |
1da177e4 LT |
897 | |
898 | /* | |
542f9038 | 899 | * Does the target need to split even further? |
1da177e4 | 900 | */ |
542f9038 MS |
901 | if (ti->max_io_len) { |
902 | offset = dm_target_offset(ti, sector); | |
903 | if (unlikely(ti->max_io_len & (ti->max_io_len - 1))) | |
904 | max_len = sector_div(offset, ti->max_io_len); | |
905 | else | |
906 | max_len = offset & (ti->max_io_len - 1); | |
907 | max_len = ti->max_io_len - max_len; | |
908 | ||
909 | if (len > max_len) | |
910 | len = max_len; | |
1da177e4 LT |
911 | } |
912 | ||
913 | return len; | |
914 | } | |
915 | ||
542f9038 MS |
916 | int dm_set_target_max_io_len(struct dm_target *ti, sector_t len) |
917 | { | |
918 | if (len > UINT_MAX) { | |
919 | DMERR("Specified maximum size of target IO (%llu) exceeds limit (%u)", | |
920 | (unsigned long long)len, UINT_MAX); | |
921 | ti->error = "Maximum size of target IO is too large"; | |
922 | return -EINVAL; | |
923 | } | |
924 | ||
925 | ti->max_io_len = (uint32_t) len; | |
926 | ||
927 | return 0; | |
928 | } | |
929 | EXPORT_SYMBOL_GPL(dm_set_target_max_io_len); | |
930 | ||
f26c5719 DW |
931 | static struct dm_target *dm_dax_get_live_target(struct mapped_device *md, |
932 | sector_t sector, int *srcu_idx) | |
545ed20e | 933 | { |
545ed20e TK |
934 | struct dm_table *map; |
935 | struct dm_target *ti; | |
545ed20e | 936 | |
f26c5719 | 937 | map = dm_get_live_table(md, srcu_idx); |
545ed20e | 938 | if (!map) |
f26c5719 | 939 | return NULL; |
545ed20e TK |
940 | |
941 | ti = dm_table_find_target(map, sector); | |
942 | if (!dm_target_is_valid(ti)) | |
f26c5719 | 943 | return NULL; |
545ed20e | 944 | |
f26c5719 DW |
945 | return ti; |
946 | } | |
545ed20e | 947 | |
f26c5719 DW |
948 | static long dm_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, |
949 | long nr_pages, void **kaddr, pfn_t *pfn) | |
950 | { | |
951 | struct mapped_device *md = dax_get_private(dax_dev); | |
952 | sector_t sector = pgoff * PAGE_SECTORS; | |
953 | struct dm_target *ti; | |
954 | long len, ret = -EIO; | |
955 | int srcu_idx; | |
545ed20e | 956 | |
f26c5719 | 957 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); |
545ed20e | 958 | |
f26c5719 DW |
959 | if (!ti) |
960 | goto out; | |
961 | if (!ti->type->direct_access) | |
962 | goto out; | |
963 | len = max_io_len(sector, ti) / PAGE_SECTORS; | |
964 | if (len < 1) | |
965 | goto out; | |
966 | nr_pages = min(len, nr_pages); | |
545ed20e | 967 | if (ti->type->direct_access) |
817bf402 DW |
968 | ret = ti->type->direct_access(ti, pgoff, nr_pages, kaddr, pfn); |
969 | ||
f26c5719 | 970 | out: |
545ed20e | 971 | dm_put_live_table(md, srcu_idx); |
f26c5719 DW |
972 | |
973 | return ret; | |
545ed20e TK |
974 | } |
975 | ||
7e026c8c DW |
976 | static size_t dm_dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, |
977 | void *addr, size_t bytes, struct iov_iter *i) | |
978 | { | |
979 | struct mapped_device *md = dax_get_private(dax_dev); | |
980 | sector_t sector = pgoff * PAGE_SECTORS; | |
981 | struct dm_target *ti; | |
982 | long ret = 0; | |
983 | int srcu_idx; | |
984 | ||
985 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); | |
986 | ||
987 | if (!ti) | |
988 | goto out; | |
989 | if (!ti->type->dax_copy_from_iter) { | |
990 | ret = copy_from_iter(addr, bytes, i); | |
991 | goto out; | |
992 | } | |
993 | ret = ti->type->dax_copy_from_iter(ti, pgoff, addr, bytes, i); | |
994 | out: | |
995 | dm_put_live_table(md, srcu_idx); | |
996 | ||
997 | return ret; | |
998 | } | |
999 | ||
abebfbe2 DW |
1000 | static void dm_dax_flush(struct dax_device *dax_dev, pgoff_t pgoff, void *addr, |
1001 | size_t size) | |
1002 | { | |
1003 | struct mapped_device *md = dax_get_private(dax_dev); | |
1004 | sector_t sector = pgoff * PAGE_SECTORS; | |
1005 | struct dm_target *ti; | |
1006 | int srcu_idx; | |
1007 | ||
1008 | ti = dm_dax_get_live_target(md, sector, &srcu_idx); | |
1009 | ||
1010 | if (!ti) | |
1011 | goto out; | |
1012 | if (ti->type->dax_flush) | |
1013 | ti->type->dax_flush(ti, pgoff, addr, size); | |
1014 | out: | |
1015 | dm_put_live_table(md, srcu_idx); | |
1016 | } | |
1017 | ||
1dd40c3e MP |
1018 | /* |
1019 | * A target may call dm_accept_partial_bio only from the map routine. It is | |
28a8f0d3 | 1020 | * allowed for all bio types except REQ_PREFLUSH. |
1dd40c3e MP |
1021 | * |
1022 | * dm_accept_partial_bio informs the dm that the target only wants to process | |
1023 | * additional n_sectors sectors of the bio and the rest of the data should be | |
1024 | * sent in a next bio. | |
1025 | * | |
1026 | * A diagram that explains the arithmetics: | |
1027 | * +--------------------+---------------+-------+ | |
1028 | * | 1 | 2 | 3 | | |
1029 | * +--------------------+---------------+-------+ | |
1030 | * | |
1031 | * <-------------- *tio->len_ptr ---------------> | |
1032 | * <------- bi_size -------> | |
1033 | * <-- n_sectors --> | |
1034 | * | |
1035 | * Region 1 was already iterated over with bio_advance or similar function. | |
1036 | * (it may be empty if the target doesn't use bio_advance) | |
1037 | * Region 2 is the remaining bio size that the target wants to process. | |
1038 | * (it may be empty if region 1 is non-empty, although there is no reason | |
1039 | * to make it empty) | |
1040 | * The target requires that region 3 is to be sent in the next bio. | |
1041 | * | |
1042 | * If the target wants to receive multiple copies of the bio (via num_*bios, etc), | |
1043 | * the partially processed part (the sum of regions 1+2) must be the same for all | |
1044 | * copies of the bio. | |
1045 | */ | |
1046 | void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors) | |
1047 | { | |
1048 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); | |
1049 | unsigned bi_size = bio->bi_iter.bi_size >> SECTOR_SHIFT; | |
1eff9d32 | 1050 | BUG_ON(bio->bi_opf & REQ_PREFLUSH); |
1dd40c3e MP |
1051 | BUG_ON(bi_size > *tio->len_ptr); |
1052 | BUG_ON(n_sectors > bi_size); | |
1053 | *tio->len_ptr -= bi_size - n_sectors; | |
1054 | bio->bi_iter.bi_size = n_sectors << SECTOR_SHIFT; | |
1055 | } | |
1056 | EXPORT_SYMBOL_GPL(dm_accept_partial_bio); | |
1057 | ||
10999307 DLM |
1058 | /* |
1059 | * The zone descriptors obtained with a zone report indicate | |
1060 | * zone positions within the target device. The zone descriptors | |
1061 | * must be remapped to match their position within the dm device. | |
1062 | * A target may call dm_remap_zone_report after completion of a | |
1063 | * REQ_OP_ZONE_REPORT bio to remap the zone descriptors obtained | |
1064 | * from the target device mapping to the dm device. | |
1065 | */ | |
1066 | void dm_remap_zone_report(struct dm_target *ti, struct bio *bio, sector_t start) | |
1067 | { | |
1068 | #ifdef CONFIG_BLK_DEV_ZONED | |
1069 | struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); | |
1070 | struct bio *report_bio = tio->io->bio; | |
1071 | struct blk_zone_report_hdr *hdr = NULL; | |
1072 | struct blk_zone *zone; | |
1073 | unsigned int nr_rep = 0; | |
1074 | unsigned int ofst; | |
1075 | struct bio_vec bvec; | |
1076 | struct bvec_iter iter; | |
1077 | void *addr; | |
1078 | ||
1079 | if (bio->bi_status) | |
1080 | return; | |
1081 | ||
1082 | /* | |
1083 | * Remap the start sector of the reported zones. For sequential zones, | |
1084 | * also remap the write pointer position. | |
1085 | */ | |
1086 | bio_for_each_segment(bvec, report_bio, iter) { | |
1087 | addr = kmap_atomic(bvec.bv_page); | |
1088 | ||
1089 | /* Remember the report header in the first page */ | |
1090 | if (!hdr) { | |
1091 | hdr = addr; | |
1092 | ofst = sizeof(struct blk_zone_report_hdr); | |
1093 | } else | |
1094 | ofst = 0; | |
1095 | ||
1096 | /* Set zones start sector */ | |
1097 | while (hdr->nr_zones && ofst < bvec.bv_len) { | |
1098 | zone = addr + ofst; | |
1099 | if (zone->start >= start + ti->len) { | |
1100 | hdr->nr_zones = 0; | |
1101 | break; | |
1102 | } | |
1103 | zone->start = zone->start + ti->begin - start; | |
1104 | if (zone->type != BLK_ZONE_TYPE_CONVENTIONAL) { | |
1105 | if (zone->cond == BLK_ZONE_COND_FULL) | |
1106 | zone->wp = zone->start + zone->len; | |
1107 | else if (zone->cond == BLK_ZONE_COND_EMPTY) | |
1108 | zone->wp = zone->start; | |
1109 | else | |
1110 | zone->wp = zone->wp + ti->begin - start; | |
1111 | } | |
1112 | ofst += sizeof(struct blk_zone); | |
1113 | hdr->nr_zones--; | |
1114 | nr_rep++; | |
1115 | } | |
1116 | ||
1117 | if (addr != hdr) | |
1118 | kunmap_atomic(addr); | |
1119 | ||
1120 | if (!hdr->nr_zones) | |
1121 | break; | |
1122 | } | |
1123 | ||
1124 | if (hdr) { | |
1125 | hdr->nr_zones = nr_rep; | |
1126 | kunmap_atomic(hdr); | |
1127 | } | |
1128 | ||
1129 | bio_advance(report_bio, report_bio->bi_iter.bi_size); | |
1130 | ||
1131 | #else /* !CONFIG_BLK_DEV_ZONED */ | |
1132 | bio->bi_status = BLK_STS_NOTSUPP; | |
1133 | #endif | |
1134 | } | |
1135 | EXPORT_SYMBOL_GPL(dm_remap_zone_report); | |
1136 | ||
d67a5f4b MP |
1137 | /* |
1138 | * Flush current->bio_list when the target map method blocks. | |
1139 | * This fixes deadlocks in snapshot and possibly in other targets. | |
1140 | */ | |
1141 | struct dm_offload { | |
1142 | struct blk_plug plug; | |
1143 | struct blk_plug_cb cb; | |
1144 | }; | |
1145 | ||
1146 | static void flush_current_bio_list(struct blk_plug_cb *cb, bool from_schedule) | |
1147 | { | |
1148 | struct dm_offload *o = container_of(cb, struct dm_offload, cb); | |
1149 | struct bio_list list; | |
1150 | struct bio *bio; | |
f5fe1b51 | 1151 | int i; |
d67a5f4b MP |
1152 | |
1153 | INIT_LIST_HEAD(&o->cb.list); | |
1154 | ||
1155 | if (unlikely(!current->bio_list)) | |
1156 | return; | |
1157 | ||
f5fe1b51 N |
1158 | for (i = 0; i < 2; i++) { |
1159 | list = current->bio_list[i]; | |
1160 | bio_list_init(¤t->bio_list[i]); | |
1161 | ||
1162 | while ((bio = bio_list_pop(&list))) { | |
1163 | struct bio_set *bs = bio->bi_pool; | |
47e0fb46 N |
1164 | if (unlikely(!bs) || bs == fs_bio_set || |
1165 | !bs->rescue_workqueue) { | |
f5fe1b51 N |
1166 | bio_list_add(¤t->bio_list[i], bio); |
1167 | continue; | |
1168 | } | |
1169 | ||
1170 | spin_lock(&bs->rescue_lock); | |
1171 | bio_list_add(&bs->rescue_list, bio); | |
1172 | queue_work(bs->rescue_workqueue, &bs->rescue_work); | |
1173 | spin_unlock(&bs->rescue_lock); | |
d67a5f4b | 1174 | } |
d67a5f4b MP |
1175 | } |
1176 | } | |
1177 | ||
1178 | static void dm_offload_start(struct dm_offload *o) | |
1179 | { | |
1180 | blk_start_plug(&o->plug); | |
1181 | o->cb.callback = flush_current_bio_list; | |
1182 | list_add(&o->cb.list, ¤t->plug->cb_list); | |
1183 | } | |
1184 | ||
1185 | static void dm_offload_end(struct dm_offload *o) | |
1186 | { | |
1187 | list_del(&o->cb.list); | |
1188 | blk_finish_plug(&o->plug); | |
1189 | } | |
1190 | ||
bd2a49b8 | 1191 | static void __map_bio(struct dm_target_io *tio) |
1da177e4 LT |
1192 | { |
1193 | int r; | |
2056a782 | 1194 | sector_t sector; |
d67a5f4b | 1195 | struct dm_offload o; |
dba14160 | 1196 | struct bio *clone = &tio->clone; |
bd2a49b8 | 1197 | struct dm_target *ti = tio->ti; |
1da177e4 | 1198 | |
1da177e4 | 1199 | clone->bi_end_io = clone_endio; |
1da177e4 LT |
1200 | |
1201 | /* | |
1202 | * Map the clone. If r == 0 we don't need to do | |
1203 | * anything, the target has assumed ownership of | |
1204 | * this io. | |
1205 | */ | |
1206 | atomic_inc(&tio->io->io_count); | |
4f024f37 | 1207 | sector = clone->bi_iter.bi_sector; |
d67a5f4b MP |
1208 | |
1209 | dm_offload_start(&o); | |
7de3ee57 | 1210 | r = ti->type->map(ti, clone); |
d67a5f4b MP |
1211 | dm_offload_end(&o); |
1212 | ||
846785e6 CH |
1213 | switch (r) { |
1214 | case DM_MAPIO_SUBMITTED: | |
1215 | break; | |
1216 | case DM_MAPIO_REMAPPED: | |
1da177e4 | 1217 | /* the bio has been remapped so dispatch it */ |
74d46992 CH |
1218 | trace_block_bio_remap(clone->bi_disk->queue, clone, |
1219 | bio_dev(tio->io->bio), sector); | |
1da177e4 | 1220 | generic_make_request(clone); |
846785e6 CH |
1221 | break; |
1222 | case DM_MAPIO_KILL: | |
4e4cbee9 CH |
1223 | dec_pending(tio->io, BLK_STS_IOERR); |
1224 | free_tio(tio); | |
1225 | break; | |
846785e6 | 1226 | case DM_MAPIO_REQUEUE: |
4e4cbee9 | 1227 | dec_pending(tio->io, BLK_STS_DM_REQUEUE); |
cfae7529 | 1228 | free_tio(tio); |
846785e6 CH |
1229 | break; |
1230 | default: | |
45cbcd79 KU |
1231 | DMWARN("unimplemented target map return value: %d", r); |
1232 | BUG(); | |
1da177e4 LT |
1233 | } |
1234 | } | |
1235 | ||
1236 | struct clone_info { | |
1237 | struct mapped_device *md; | |
1238 | struct dm_table *map; | |
1239 | struct bio *bio; | |
1240 | struct dm_io *io; | |
1241 | sector_t sector; | |
e0d6609a | 1242 | unsigned sector_count; |
1da177e4 LT |
1243 | }; |
1244 | ||
e0d6609a | 1245 | static void bio_setup_sector(struct bio *bio, sector_t sector, unsigned len) |
bd2a49b8 | 1246 | { |
4f024f37 KO |
1247 | bio->bi_iter.bi_sector = sector; |
1248 | bio->bi_iter.bi_size = to_bytes(len); | |
1da177e4 LT |
1249 | } |
1250 | ||
1251 | /* | |
1252 | * Creates a bio that consists of range of complete bvecs. | |
1253 | */ | |
c80914e8 MS |
1254 | static int clone_bio(struct dm_target_io *tio, struct bio *bio, |
1255 | sector_t sector, unsigned len) | |
1da177e4 | 1256 | { |
dba14160 | 1257 | struct bio *clone = &tio->clone; |
1da177e4 | 1258 | |
1c3b13e6 KO |
1259 | __bio_clone_fast(clone, bio); |
1260 | ||
e2460f2a MP |
1261 | if (unlikely(bio_integrity(bio) != NULL)) { |
1262 | int r; | |
1263 | ||
1264 | if (unlikely(!dm_target_has_integrity(tio->ti->type) && | |
1265 | !dm_target_passes_integrity(tio->ti->type))) { | |
1266 | DMWARN("%s: the target %s doesn't support integrity data.", | |
1267 | dm_device_name(tio->io->md), | |
1268 | tio->ti->type->name); | |
1269 | return -EIO; | |
1270 | } | |
1271 | ||
1272 | r = bio_integrity_clone(clone, bio, GFP_NOIO); | |
c80914e8 MS |
1273 | if (r < 0) |
1274 | return r; | |
1275 | } | |
bd2a49b8 | 1276 | |
264c869d DLM |
1277 | if (bio_op(bio) != REQ_OP_ZONE_REPORT) |
1278 | bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector)); | |
1c3b13e6 KO |
1279 | clone->bi_iter.bi_size = to_bytes(len); |
1280 | ||
e2460f2a | 1281 | if (unlikely(bio_integrity(bio) != NULL)) |
fbd08e76 | 1282 | bio_integrity_trim(clone); |
c80914e8 MS |
1283 | |
1284 | return 0; | |
1da177e4 LT |
1285 | } |
1286 | ||
9015df24 | 1287 | static struct dm_target_io *alloc_tio(struct clone_info *ci, |
99778273 | 1288 | struct dm_target *ti, |
55a62eef | 1289 | unsigned target_bio_nr) |
f9ab94ce | 1290 | { |
dba14160 MP |
1291 | struct dm_target_io *tio; |
1292 | struct bio *clone; | |
1293 | ||
99778273 | 1294 | clone = bio_alloc_bioset(GFP_NOIO, 0, ci->md->bs); |
dba14160 | 1295 | tio = container_of(clone, struct dm_target_io, clone); |
f9ab94ce MP |
1296 | |
1297 | tio->io = ci->io; | |
1298 | tio->ti = ti; | |
55a62eef | 1299 | tio->target_bio_nr = target_bio_nr; |
9015df24 AK |
1300 | |
1301 | return tio; | |
1302 | } | |
1303 | ||
14fe594d AK |
1304 | static void __clone_and_map_simple_bio(struct clone_info *ci, |
1305 | struct dm_target *ti, | |
1dd40c3e | 1306 | unsigned target_bio_nr, unsigned *len) |
9015df24 | 1307 | { |
99778273 | 1308 | struct dm_target_io *tio = alloc_tio(ci, ti, target_bio_nr); |
dba14160 | 1309 | struct bio *clone = &tio->clone; |
9015df24 | 1310 | |
1dd40c3e MP |
1311 | tio->len_ptr = len; |
1312 | ||
99778273 | 1313 | __bio_clone_fast(clone, ci->bio); |
bd2a49b8 | 1314 | if (len) |
1dd40c3e | 1315 | bio_setup_sector(clone, ci->sector, *len); |
f9ab94ce | 1316 | |
bd2a49b8 | 1317 | __map_bio(tio); |
f9ab94ce MP |
1318 | } |
1319 | ||
14fe594d | 1320 | static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti, |
1dd40c3e | 1321 | unsigned num_bios, unsigned *len) |
06a426ce | 1322 | { |
55a62eef | 1323 | unsigned target_bio_nr; |
06a426ce | 1324 | |
55a62eef | 1325 | for (target_bio_nr = 0; target_bio_nr < num_bios; target_bio_nr++) |
14fe594d | 1326 | __clone_and_map_simple_bio(ci, ti, target_bio_nr, len); |
06a426ce MS |
1327 | } |
1328 | ||
14fe594d | 1329 | static int __send_empty_flush(struct clone_info *ci) |
f9ab94ce | 1330 | { |
06a426ce | 1331 | unsigned target_nr = 0; |
f9ab94ce MP |
1332 | struct dm_target *ti; |
1333 | ||
b372d360 | 1334 | BUG_ON(bio_has_data(ci->bio)); |
f9ab94ce | 1335 | while ((ti = dm_table_get_target(ci->map, target_nr++))) |
1dd40c3e | 1336 | __send_duplicate_bios(ci, ti, ti->num_flush_bios, NULL); |
f9ab94ce | 1337 | |
f9ab94ce MP |
1338 | return 0; |
1339 | } | |
1340 | ||
c80914e8 | 1341 | static int __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti, |
1dd40c3e | 1342 | sector_t sector, unsigned *len) |
5ae89a87 | 1343 | { |
dba14160 | 1344 | struct bio *bio = ci->bio; |
5ae89a87 | 1345 | struct dm_target_io *tio; |
b0d8ed4d AK |
1346 | unsigned target_bio_nr; |
1347 | unsigned num_target_bios = 1; | |
c80914e8 | 1348 | int r = 0; |
5ae89a87 | 1349 | |
b0d8ed4d AK |
1350 | /* |
1351 | * Does the target want to receive duplicate copies of the bio? | |
1352 | */ | |
1353 | if (bio_data_dir(bio) == WRITE && ti->num_write_bios) | |
1354 | num_target_bios = ti->num_write_bios(ti, bio); | |
e4c93811 | 1355 | |
b0d8ed4d | 1356 | for (target_bio_nr = 0; target_bio_nr < num_target_bios; target_bio_nr++) { |
99778273 | 1357 | tio = alloc_tio(ci, ti, target_bio_nr); |
1dd40c3e | 1358 | tio->len_ptr = len; |
c80914e8 | 1359 | r = clone_bio(tio, bio, sector, *len); |
072623de | 1360 | if (r < 0) { |
cfae7529 | 1361 | free_tio(tio); |
c80914e8 | 1362 | break; |
072623de | 1363 | } |
b0d8ed4d AK |
1364 | __map_bio(tio); |
1365 | } | |
c80914e8 MS |
1366 | |
1367 | return r; | |
5ae89a87 MS |
1368 | } |
1369 | ||
55a62eef | 1370 | typedef unsigned (*get_num_bios_fn)(struct dm_target *ti); |
23508a96 | 1371 | |
55a62eef | 1372 | static unsigned get_num_discard_bios(struct dm_target *ti) |
23508a96 | 1373 | { |
55a62eef | 1374 | return ti->num_discard_bios; |
23508a96 MS |
1375 | } |
1376 | ||
55a62eef | 1377 | static unsigned get_num_write_same_bios(struct dm_target *ti) |
23508a96 | 1378 | { |
55a62eef | 1379 | return ti->num_write_same_bios; |
23508a96 MS |
1380 | } |
1381 | ||
ac62d620 CH |
1382 | static unsigned get_num_write_zeroes_bios(struct dm_target *ti) |
1383 | { | |
1384 | return ti->num_write_zeroes_bios; | |
1385 | } | |
1386 | ||
23508a96 | 1387 | typedef bool (*is_split_required_fn)(struct dm_target *ti); |
9eef87da | 1388 | |
23508a96 MS |
1389 | static bool is_split_required_for_discard(struct dm_target *ti) |
1390 | { | |
55a62eef | 1391 | return ti->split_discard_bios; |
cec47e3d KU |
1392 | } |
1393 | ||
14fe594d AK |
1394 | static int __send_changing_extent_only(struct clone_info *ci, |
1395 | get_num_bios_fn get_num_bios, | |
1396 | is_split_required_fn is_split_required) | |
ba1cbad9 | 1397 | { |
5ae89a87 | 1398 | struct dm_target *ti; |
e0d6609a | 1399 | unsigned len; |
55a62eef | 1400 | unsigned num_bios; |
ba1cbad9 | 1401 | |
a79245b3 MS |
1402 | do { |
1403 | ti = dm_table_find_target(ci->map, ci->sector); | |
1404 | if (!dm_target_is_valid(ti)) | |
1405 | return -EIO; | |
2eb6e1e3 | 1406 | |
5ae89a87 | 1407 | /* |
23508a96 MS |
1408 | * Even though the device advertised support for this type of |
1409 | * request, that does not mean every target supports it, and | |
936688d7 | 1410 | * reconfiguration might also have changed that since the |
a79245b3 | 1411 | * check was performed. |
5ae89a87 | 1412 | */ |
55a62eef AK |
1413 | num_bios = get_num_bios ? get_num_bios(ti) : 0; |
1414 | if (!num_bios) | |
a79245b3 | 1415 | return -EOPNOTSUPP; |
ba1cbad9 | 1416 | |
23508a96 | 1417 | if (is_split_required && !is_split_required(ti)) |
e0d6609a | 1418 | len = min((sector_t)ci->sector_count, max_io_len_target_boundary(ci->sector, ti)); |
7acf0277 | 1419 | else |
e0d6609a | 1420 | len = min((sector_t)ci->sector_count, max_io_len(ci->sector, ti)); |
de3ec86d | 1421 | |
1dd40c3e | 1422 | __send_duplicate_bios(ci, ti, num_bios, &len); |
e262f347 | 1423 | |
a79245b3 MS |
1424 | ci->sector += len; |
1425 | } while (ci->sector_count -= len); | |
5ae89a87 MS |
1426 | |
1427 | return 0; | |
ba1cbad9 MS |
1428 | } |
1429 | ||
14fe594d | 1430 | static int __send_discard(struct clone_info *ci) |
23508a96 | 1431 | { |
14fe594d AK |
1432 | return __send_changing_extent_only(ci, get_num_discard_bios, |
1433 | is_split_required_for_discard); | |
23508a96 | 1434 | } |
0ce65797 | 1435 | |
14fe594d | 1436 | static int __send_write_same(struct clone_info *ci) |
0ce65797 | 1437 | { |
14fe594d | 1438 | return __send_changing_extent_only(ci, get_num_write_same_bios, NULL); |
0ce65797 MS |
1439 | } |
1440 | ||
ac62d620 CH |
1441 | static int __send_write_zeroes(struct clone_info *ci) |
1442 | { | |
1443 | return __send_changing_extent_only(ci, get_num_write_zeroes_bios, NULL); | |
1444 | } | |
1445 | ||
e4c93811 AK |
1446 | /* |
1447 | * Select the correct strategy for processing a non-flush bio. | |
1448 | */ | |
14fe594d | 1449 | static int __split_and_process_non_flush(struct clone_info *ci) |
0ce65797 | 1450 | { |
dba14160 | 1451 | struct bio *bio = ci->bio; |
512875bd | 1452 | struct dm_target *ti; |
1c3b13e6 | 1453 | unsigned len; |
c80914e8 | 1454 | int r; |
0ce65797 | 1455 | |
e6047149 | 1456 | if (unlikely(bio_op(bio) == REQ_OP_DISCARD)) |
14fe594d | 1457 | return __send_discard(ci); |
e6047149 | 1458 | else if (unlikely(bio_op(bio) == REQ_OP_WRITE_SAME)) |
14fe594d | 1459 | return __send_write_same(ci); |
ac62d620 CH |
1460 | else if (unlikely(bio_op(bio) == REQ_OP_WRITE_ZEROES)) |
1461 | return __send_write_zeroes(ci); | |
0ce65797 | 1462 | |
512875bd JN |
1463 | ti = dm_table_find_target(ci->map, ci->sector); |
1464 | if (!dm_target_is_valid(ti)) | |
1465 | return -EIO; | |
1466 | ||
264c869d DLM |
1467 | if (bio_op(bio) == REQ_OP_ZONE_REPORT) |
1468 | len = ci->sector_count; | |
1469 | else | |
1470 | len = min_t(sector_t, max_io_len(ci->sector, ti), | |
1471 | ci->sector_count); | |
0ce65797 | 1472 | |
c80914e8 MS |
1473 | r = __clone_and_map_data_bio(ci, ti, ci->sector, &len); |
1474 | if (r < 0) | |
1475 | return r; | |
0ce65797 | 1476 | |
1c3b13e6 KO |
1477 | ci->sector += len; |
1478 | ci->sector_count -= len; | |
0ce65797 | 1479 | |
1c3b13e6 | 1480 | return 0; |
0ce65797 MS |
1481 | } |
1482 | ||
1da177e4 | 1483 | /* |
14fe594d | 1484 | * Entry point to split a bio into clones and submit them to the targets. |
1da177e4 | 1485 | */ |
83d5e5b0 MP |
1486 | static void __split_and_process_bio(struct mapped_device *md, |
1487 | struct dm_table *map, struct bio *bio) | |
0ce65797 | 1488 | { |
1da177e4 | 1489 | struct clone_info ci; |
512875bd | 1490 | int error = 0; |
1da177e4 | 1491 | |
83d5e5b0 | 1492 | if (unlikely(!map)) { |
6a8736d1 | 1493 | bio_io_error(bio); |
f0b9a450 MP |
1494 | return; |
1495 | } | |
692d0eb9 | 1496 | |
83d5e5b0 | 1497 | ci.map = map; |
1da177e4 | 1498 | ci.md = md; |
1da177e4 | 1499 | ci.io = alloc_io(md); |
4e4cbee9 | 1500 | ci.io->status = 0; |
1da177e4 LT |
1501 | atomic_set(&ci.io->io_count, 1); |
1502 | ci.io->bio = bio; | |
1503 | ci.io->md = md; | |
f88fb981 | 1504 | spin_lock_init(&ci.io->endio_lock); |
4f024f37 | 1505 | ci.sector = bio->bi_iter.bi_sector; |
0ce65797 | 1506 | |
3eaf840e | 1507 | start_io_acct(ci.io); |
0ce65797 | 1508 | |
1eff9d32 | 1509 | if (bio->bi_opf & REQ_PREFLUSH) { |
b372d360 MS |
1510 | ci.bio = &ci.md->flush_bio; |
1511 | ci.sector_count = 0; | |
14fe594d | 1512 | error = __send_empty_flush(&ci); |
b372d360 | 1513 | /* dec_pending submits any data associated with flush */ |
a4aa5e56 DLM |
1514 | } else if (bio_op(bio) == REQ_OP_ZONE_RESET) { |
1515 | ci.bio = bio; | |
1516 | ci.sector_count = 0; | |
1517 | error = __split_and_process_non_flush(&ci); | |
b372d360 | 1518 | } else { |
6a8736d1 | 1519 | ci.bio = bio; |
d87f4c14 | 1520 | ci.sector_count = bio_sectors(bio); |
b372d360 | 1521 | while (ci.sector_count && !error) |
14fe594d | 1522 | error = __split_and_process_non_flush(&ci); |
d87f4c14 | 1523 | } |
0ce65797 | 1524 | |
1da177e4 | 1525 | /* drop the extra reference count */ |
512875bd | 1526 | dec_pending(ci.io, error); |
0ce65797 | 1527 | } |
1da177e4 LT |
1528 | /*----------------------------------------------------------------- |
1529 | * CRUD END | |
1530 | *---------------------------------------------------------------*/ | |
0ce65797 | 1531 | |
cec47e3d | 1532 | /* |
1da177e4 LT |
1533 | * The request function that just remaps the bio built up by |
1534 | * dm_merge_bvec. | |
cec47e3d | 1535 | */ |
dece1635 | 1536 | static blk_qc_t dm_make_request(struct request_queue *q, struct bio *bio) |
cec47e3d | 1537 | { |
12f03a49 | 1538 | int rw = bio_data_dir(bio); |
cec47e3d | 1539 | struct mapped_device *md = q->queuedata; |
83d5e5b0 MP |
1540 | int srcu_idx; |
1541 | struct dm_table *map; | |
cec47e3d | 1542 | |
83d5e5b0 | 1543 | map = dm_get_live_table(md, &srcu_idx); |
29e4013d | 1544 | |
d62e26b3 | 1545 | generic_start_io_acct(q, rw, bio_sectors(bio), &dm_disk(md)->part0); |
d0bcb878 | 1546 | |
6a8736d1 TH |
1547 | /* if we're suspended, we have to queue this io for later */ |
1548 | if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags))) { | |
83d5e5b0 | 1549 | dm_put_live_table(md, srcu_idx); |
9eef87da | 1550 | |
1eff9d32 | 1551 | if (!(bio->bi_opf & REQ_RAHEAD)) |
6a8736d1 TH |
1552 | queue_io(md, bio); |
1553 | else | |
54d9a1b4 | 1554 | bio_io_error(bio); |
dece1635 | 1555 | return BLK_QC_T_NONE; |
cec47e3d | 1556 | } |
1da177e4 | 1557 | |
83d5e5b0 MP |
1558 | __split_and_process_bio(md, map, bio); |
1559 | dm_put_live_table(md, srcu_idx); | |
dece1635 | 1560 | return BLK_QC_T_NONE; |
cec47e3d KU |
1561 | } |
1562 | ||
1da177e4 LT |
1563 | static int dm_any_congested(void *congested_data, int bdi_bits) |
1564 | { | |
8a57dfc6 CS |
1565 | int r = bdi_bits; |
1566 | struct mapped_device *md = congested_data; | |
1567 | struct dm_table *map; | |
1da177e4 | 1568 | |
1eb787ec | 1569 | if (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) { |
e522c039 | 1570 | if (dm_request_based(md)) { |
cec47e3d | 1571 | /* |
e522c039 MS |
1572 | * With request-based DM we only need to check the |
1573 | * top-level queue for congestion. | |
cec47e3d | 1574 | */ |
dc3b17cc | 1575 | r = md->queue->backing_dev_info->wb.state & bdi_bits; |
e522c039 MS |
1576 | } else { |
1577 | map = dm_get_live_table_fast(md); | |
1578 | if (map) | |
cec47e3d | 1579 | r = dm_table_any_congested(map, bdi_bits); |
e522c039 | 1580 | dm_put_live_table_fast(md); |
8a57dfc6 CS |
1581 | } |
1582 | } | |
1583 | ||
1da177e4 LT |
1584 | return r; |
1585 | } | |
1586 | ||
1587 | /*----------------------------------------------------------------- | |
1588 | * An IDR is used to keep track of allocated minor numbers. | |
1589 | *---------------------------------------------------------------*/ | |
2b06cfff | 1590 | static void free_minor(int minor) |
1da177e4 | 1591 | { |
f32c10b0 | 1592 | spin_lock(&_minor_lock); |
1da177e4 | 1593 | idr_remove(&_minor_idr, minor); |
f32c10b0 | 1594 | spin_unlock(&_minor_lock); |
1da177e4 LT |
1595 | } |
1596 | ||
1597 | /* | |
1598 | * See if the device with a specific minor # is free. | |
1599 | */ | |
cf13ab8e | 1600 | static int specific_minor(int minor) |
1da177e4 | 1601 | { |
c9d76be6 | 1602 | int r; |
1da177e4 LT |
1603 | |
1604 | if (minor >= (1 << MINORBITS)) | |
1605 | return -EINVAL; | |
1606 | ||
c9d76be6 | 1607 | idr_preload(GFP_KERNEL); |
f32c10b0 | 1608 | spin_lock(&_minor_lock); |
1da177e4 | 1609 | |
c9d76be6 | 1610 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, minor, minor + 1, GFP_NOWAIT); |
1da177e4 | 1611 | |
f32c10b0 | 1612 | spin_unlock(&_minor_lock); |
c9d76be6 TH |
1613 | idr_preload_end(); |
1614 | if (r < 0) | |
1615 | return r == -ENOSPC ? -EBUSY : r; | |
1616 | return 0; | |
1da177e4 LT |
1617 | } |
1618 | ||
cf13ab8e | 1619 | static int next_free_minor(int *minor) |
1da177e4 | 1620 | { |
c9d76be6 | 1621 | int r; |
62f75c2f | 1622 | |
c9d76be6 | 1623 | idr_preload(GFP_KERNEL); |
f32c10b0 | 1624 | spin_lock(&_minor_lock); |
1da177e4 | 1625 | |
c9d76be6 | 1626 | r = idr_alloc(&_minor_idr, MINOR_ALLOCED, 0, 1 << MINORBITS, GFP_NOWAIT); |
1da177e4 | 1627 | |
f32c10b0 | 1628 | spin_unlock(&_minor_lock); |
c9d76be6 TH |
1629 | idr_preload_end(); |
1630 | if (r < 0) | |
1631 | return r; | |
1632 | *minor = r; | |
1633 | return 0; | |
1da177e4 LT |
1634 | } |
1635 | ||
83d5cde4 | 1636 | static const struct block_device_operations dm_blk_dops; |
f26c5719 | 1637 | static const struct dax_operations dm_dax_ops; |
1da177e4 | 1638 | |
53d5914f MP |
1639 | static void dm_wq_work(struct work_struct *work); |
1640 | ||
4cc96131 | 1641 | void dm_init_md_queue(struct mapped_device *md) |
4a0b4ddf MS |
1642 | { |
1643 | /* | |
1644 | * Request-based dm devices cannot be stacked on top of bio-based dm | |
bfebd1cd | 1645 | * devices. The type of this dm device may not have been decided yet. |
4a0b4ddf MS |
1646 | * The type is decided at the first table loading time. |
1647 | * To prevent problematic device stacking, clear the queue flag | |
1648 | * for request stacking support until then. | |
1649 | * | |
1650 | * This queue is new, so no concurrency on the queue_flags. | |
1651 | */ | |
1652 | queue_flag_clear_unlocked(QUEUE_FLAG_STACKABLE, md->queue); | |
ad5f498f MP |
1653 | |
1654 | /* | |
1655 | * Initialize data that will only be used by a non-blk-mq DM queue | |
1656 | * - must do so here (in alloc_dev callchain) before queue is used | |
1657 | */ | |
1658 | md->queue->queuedata = md; | |
dc3b17cc | 1659 | md->queue->backing_dev_info->congested_data = md; |
bfebd1cd | 1660 | } |
4a0b4ddf | 1661 | |
4cc96131 | 1662 | void dm_init_normal_md_queue(struct mapped_device *md) |
bfebd1cd | 1663 | { |
17e149b8 | 1664 | md->use_blk_mq = false; |
bfebd1cd MS |
1665 | dm_init_md_queue(md); |
1666 | ||
1667 | /* | |
1668 | * Initialize aspects of queue that aren't relevant for blk-mq | |
1669 | */ | |
dc3b17cc | 1670 | md->queue->backing_dev_info->congested_fn = dm_any_congested; |
4a0b4ddf MS |
1671 | } |
1672 | ||
0f20972f MS |
1673 | static void cleanup_mapped_device(struct mapped_device *md) |
1674 | { | |
0f20972f MS |
1675 | if (md->wq) |
1676 | destroy_workqueue(md->wq); | |
1677 | if (md->kworker_task) | |
1678 | kthread_stop(md->kworker_task); | |
6f65985e | 1679 | mempool_destroy(md->io_pool); |
0f20972f MS |
1680 | if (md->bs) |
1681 | bioset_free(md->bs); | |
1682 | ||
f26c5719 DW |
1683 | if (md->dax_dev) { |
1684 | kill_dax(md->dax_dev); | |
1685 | put_dax(md->dax_dev); | |
1686 | md->dax_dev = NULL; | |
1687 | } | |
1688 | ||
0f20972f MS |
1689 | if (md->disk) { |
1690 | spin_lock(&_minor_lock); | |
1691 | md->disk->private_data = NULL; | |
1692 | spin_unlock(&_minor_lock); | |
0f20972f MS |
1693 | del_gendisk(md->disk); |
1694 | put_disk(md->disk); | |
1695 | } | |
1696 | ||
1697 | if (md->queue) | |
1698 | blk_cleanup_queue(md->queue); | |
1699 | ||
d09960b0 TE |
1700 | cleanup_srcu_struct(&md->io_barrier); |
1701 | ||
0f20972f MS |
1702 | if (md->bdev) { |
1703 | bdput(md->bdev); | |
1704 | md->bdev = NULL; | |
1705 | } | |
4cc96131 MS |
1706 | |
1707 | dm_mq_cleanup_mapped_device(md); | |
0f20972f MS |
1708 | } |
1709 | ||
1da177e4 LT |
1710 | /* |
1711 | * Allocate and initialise a blank device with a given minor. | |
1712 | */ | |
2b06cfff | 1713 | static struct mapped_device *alloc_dev(int minor) |
1da177e4 | 1714 | { |
115485e8 | 1715 | int r, numa_node_id = dm_get_numa_node(); |
f26c5719 | 1716 | struct dax_device *dax_dev; |
115485e8 | 1717 | struct mapped_device *md; |
ba61fdd1 | 1718 | void *old_md; |
1da177e4 | 1719 | |
115485e8 | 1720 | md = kzalloc_node(sizeof(*md), GFP_KERNEL, numa_node_id); |
1da177e4 LT |
1721 | if (!md) { |
1722 | DMWARN("unable to allocate device, out of memory."); | |
1723 | return NULL; | |
1724 | } | |
1725 | ||
10da4f79 | 1726 | if (!try_module_get(THIS_MODULE)) |
6ed7ade8 | 1727 | goto bad_module_get; |
10da4f79 | 1728 | |
1da177e4 | 1729 | /* get a minor number for the dev */ |
2b06cfff | 1730 | if (minor == DM_ANY_MINOR) |
cf13ab8e | 1731 | r = next_free_minor(&minor); |
2b06cfff | 1732 | else |
cf13ab8e | 1733 | r = specific_minor(minor); |
1da177e4 | 1734 | if (r < 0) |
6ed7ade8 | 1735 | goto bad_minor; |
1da177e4 | 1736 | |
83d5e5b0 MP |
1737 | r = init_srcu_struct(&md->io_barrier); |
1738 | if (r < 0) | |
1739 | goto bad_io_barrier; | |
1740 | ||
115485e8 | 1741 | md->numa_node_id = numa_node_id; |
4cc96131 | 1742 | md->use_blk_mq = dm_use_blk_mq_default(); |
591ddcfc | 1743 | md->init_tio_pdu = false; |
a5664dad | 1744 | md->type = DM_TYPE_NONE; |
e61290a4 | 1745 | mutex_init(&md->suspend_lock); |
a5664dad | 1746 | mutex_init(&md->type_lock); |
86f1152b | 1747 | mutex_init(&md->table_devices_lock); |
022c2611 | 1748 | spin_lock_init(&md->deferred_lock); |
1da177e4 | 1749 | atomic_set(&md->holders, 1); |
5c6bd75d | 1750 | atomic_set(&md->open_count, 0); |
1da177e4 | 1751 | atomic_set(&md->event_nr, 0); |
7a8c3d3b MA |
1752 | atomic_set(&md->uevent_seq, 0); |
1753 | INIT_LIST_HEAD(&md->uevent_list); | |
86f1152b | 1754 | INIT_LIST_HEAD(&md->table_devices); |
7a8c3d3b | 1755 | spin_lock_init(&md->uevent_lock); |
1da177e4 | 1756 | |
115485e8 | 1757 | md->queue = blk_alloc_queue_node(GFP_KERNEL, numa_node_id); |
1da177e4 | 1758 | if (!md->queue) |
0f20972f | 1759 | goto bad; |
1da177e4 | 1760 | |
4a0b4ddf | 1761 | dm_init_md_queue(md); |
9faf400f | 1762 | |
115485e8 | 1763 | md->disk = alloc_disk_node(1, numa_node_id); |
1da177e4 | 1764 | if (!md->disk) |
0f20972f | 1765 | goto bad; |
1da177e4 | 1766 | |
316d315b NK |
1767 | atomic_set(&md->pending[0], 0); |
1768 | atomic_set(&md->pending[1], 0); | |
f0b04115 | 1769 | init_waitqueue_head(&md->wait); |
53d5914f | 1770 | INIT_WORK(&md->work, dm_wq_work); |
f0b04115 | 1771 | init_waitqueue_head(&md->eventq); |
2995fa78 | 1772 | init_completion(&md->kobj_holder.completion); |
2eb6e1e3 | 1773 | md->kworker_task = NULL; |
f0b04115 | 1774 | |
1da177e4 LT |
1775 | md->disk->major = _major; |
1776 | md->disk->first_minor = minor; | |
1777 | md->disk->fops = &dm_blk_dops; | |
1778 | md->disk->queue = md->queue; | |
1779 | md->disk->private_data = md; | |
1780 | sprintf(md->disk->disk_name, "dm-%d", minor); | |
f26c5719 DW |
1781 | |
1782 | dax_dev = alloc_dax(md, md->disk->disk_name, &dm_dax_ops); | |
1783 | if (!dax_dev) | |
1784 | goto bad; | |
1785 | md->dax_dev = dax_dev; | |
1786 | ||
1da177e4 | 1787 | add_disk(md->disk); |
7e51f257 | 1788 | format_dev_t(md->name, MKDEV(_major, minor)); |
1da177e4 | 1789 | |
670368a8 | 1790 | md->wq = alloc_workqueue("kdmflush", WQ_MEM_RECLAIM, 0); |
304f3f6a | 1791 | if (!md->wq) |
0f20972f | 1792 | goto bad; |
304f3f6a | 1793 | |
32a926da MP |
1794 | md->bdev = bdget_disk(md->disk, 0); |
1795 | if (!md->bdev) | |
0f20972f | 1796 | goto bad; |
32a926da | 1797 | |
3a83f467 | 1798 | bio_init(&md->flush_bio, NULL, 0); |
74d46992 | 1799 | bio_set_dev(&md->flush_bio, md->bdev); |
ff0361b3 | 1800 | md->flush_bio.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC; |
6a8736d1 | 1801 | |
fd2ed4d2 MP |
1802 | dm_stats_init(&md->stats); |
1803 | ||
ba61fdd1 | 1804 | /* Populate the mapping, nobody knows we exist yet */ |
f32c10b0 | 1805 | spin_lock(&_minor_lock); |
ba61fdd1 | 1806 | old_md = idr_replace(&_minor_idr, md, minor); |
f32c10b0 | 1807 | spin_unlock(&_minor_lock); |
ba61fdd1 JM |
1808 | |
1809 | BUG_ON(old_md != MINOR_ALLOCED); | |
1810 | ||
1da177e4 LT |
1811 | return md; |
1812 | ||
0f20972f MS |
1813 | bad: |
1814 | cleanup_mapped_device(md); | |
83d5e5b0 | 1815 | bad_io_barrier: |
1da177e4 | 1816 | free_minor(minor); |
6ed7ade8 | 1817 | bad_minor: |
10da4f79 | 1818 | module_put(THIS_MODULE); |
6ed7ade8 | 1819 | bad_module_get: |
1da177e4 LT |
1820 | kfree(md); |
1821 | return NULL; | |
1822 | } | |
1823 | ||
ae9da83f JN |
1824 | static void unlock_fs(struct mapped_device *md); |
1825 | ||
1da177e4 LT |
1826 | static void free_dev(struct mapped_device *md) |
1827 | { | |
f331c029 | 1828 | int minor = MINOR(disk_devt(md->disk)); |
63d94e48 | 1829 | |
32a926da | 1830 | unlock_fs(md); |
2eb6e1e3 | 1831 | |
0f20972f | 1832 | cleanup_mapped_device(md); |
63a4f065 | 1833 | |
86f1152b | 1834 | free_table_devices(&md->table_devices); |
63a4f065 | 1835 | dm_stats_cleanup(&md->stats); |
63a4f065 MS |
1836 | free_minor(minor); |
1837 | ||
10da4f79 | 1838 | module_put(THIS_MODULE); |
1da177e4 LT |
1839 | kfree(md); |
1840 | } | |
1841 | ||
e6ee8c0b KU |
1842 | static void __bind_mempools(struct mapped_device *md, struct dm_table *t) |
1843 | { | |
c0820cf5 | 1844 | struct dm_md_mempools *p = dm_table_get_md_mempools(t); |
e6ee8c0b | 1845 | |
4e6e36c3 MS |
1846 | if (md->bs) { |
1847 | /* The md already has necessary mempools. */ | |
545ed20e | 1848 | if (dm_table_bio_based(t)) { |
16245bdc JN |
1849 | /* |
1850 | * Reload bioset because front_pad may have changed | |
1851 | * because a different table was loaded. | |
1852 | */ | |
1853 | bioset_free(md->bs); | |
1854 | md->bs = p->bs; | |
1855 | p->bs = NULL; | |
16245bdc | 1856 | } |
4e6e36c3 MS |
1857 | /* |
1858 | * There's no need to reload with request-based dm | |
1859 | * because the size of front_pad doesn't change. | |
1860 | * Note for future: If you are to reload bioset, | |
1861 | * prep-ed requests in the queue may refer | |
1862 | * to bio from the old bioset, so you must walk | |
1863 | * through the queue to unprep. | |
1864 | */ | |
1865 | goto out; | |
c0820cf5 | 1866 | } |
e6ee8c0b | 1867 | |
eb8db831 | 1868 | BUG_ON(!p || md->io_pool || md->bs); |
cbc4e3c1 | 1869 | |
e6ee8c0b KU |
1870 | md->io_pool = p->io_pool; |
1871 | p->io_pool = NULL; | |
e6ee8c0b KU |
1872 | md->bs = p->bs; |
1873 | p->bs = NULL; | |
4e6e36c3 | 1874 | |
e6ee8c0b | 1875 | out: |
02233342 | 1876 | /* mempool bind completed, no longer need any mempools in the table */ |
e6ee8c0b KU |
1877 | dm_table_free_md_mempools(t); |
1878 | } | |
1879 | ||
1da177e4 LT |
1880 | /* |
1881 | * Bind a table to the device. | |
1882 | */ | |
1883 | static void event_callback(void *context) | |
1884 | { | |
7a8c3d3b MA |
1885 | unsigned long flags; |
1886 | LIST_HEAD(uevents); | |
1da177e4 LT |
1887 | struct mapped_device *md = (struct mapped_device *) context; |
1888 | ||
7a8c3d3b MA |
1889 | spin_lock_irqsave(&md->uevent_lock, flags); |
1890 | list_splice_init(&md->uevent_list, &uevents); | |
1891 | spin_unlock_irqrestore(&md->uevent_lock, flags); | |
1892 | ||
ed9e1982 | 1893 | dm_send_uevents(&uevents, &disk_to_dev(md->disk)->kobj); |
7a8c3d3b | 1894 | |
1da177e4 | 1895 | atomic_inc(&md->event_nr); |
93e6442c | 1896 | atomic_inc(&dm_global_event_nr); |
1da177e4 | 1897 | wake_up(&md->eventq); |
93e6442c | 1898 | wake_up(&dm_global_eventq); |
1da177e4 LT |
1899 | } |
1900 | ||
c217649b MS |
1901 | /* |
1902 | * Protected by md->suspend_lock obtained by dm_swap_table(). | |
1903 | */ | |
4e90188b | 1904 | static void __set_size(struct mapped_device *md, sector_t size) |
1da177e4 | 1905 | { |
1ea0654e BVA |
1906 | lockdep_assert_held(&md->suspend_lock); |
1907 | ||
4e90188b | 1908 | set_capacity(md->disk, size); |
1da177e4 | 1909 | |
db8fef4f | 1910 | i_size_write(md->bdev->bd_inode, (loff_t)size << SECTOR_SHIFT); |
1da177e4 LT |
1911 | } |
1912 | ||
042d2a9b AK |
1913 | /* |
1914 | * Returns old map, which caller must destroy. | |
1915 | */ | |
1916 | static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, | |
1917 | struct queue_limits *limits) | |
1da177e4 | 1918 | { |
042d2a9b | 1919 | struct dm_table *old_map; |
165125e1 | 1920 | struct request_queue *q = md->queue; |
1da177e4 LT |
1921 | sector_t size; |
1922 | ||
5a8f1f80 BVA |
1923 | lockdep_assert_held(&md->suspend_lock); |
1924 | ||
1da177e4 | 1925 | size = dm_table_get_size(t); |
3ac51e74 DW |
1926 | |
1927 | /* | |
1928 | * Wipe any geometry if the size of the table changed. | |
1929 | */ | |
fd2ed4d2 | 1930 | if (size != dm_get_size(md)) |
3ac51e74 DW |
1931 | memset(&md->geometry, 0, sizeof(md->geometry)); |
1932 | ||
32a926da | 1933 | __set_size(md, size); |
d5816876 | 1934 | |
2ca3310e AK |
1935 | dm_table_event_callback(t, event_callback, md); |
1936 | ||
e6ee8c0b KU |
1937 | /* |
1938 | * The queue hasn't been stopped yet, if the old table type wasn't | |
1939 | * for request-based during suspension. So stop it to prevent | |
1940 | * I/O mapping before resume. | |
1941 | * This must be done before setting the queue restrictions, | |
1942 | * because request-based dm may be run just after the setting. | |
1943 | */ | |
16f12266 | 1944 | if (dm_table_request_based(t)) { |
eca7ee6d | 1945 | dm_stop_queue(q); |
16f12266 MS |
1946 | /* |
1947 | * Leverage the fact that request-based DM targets are | |
1948 | * immutable singletons and establish md->immutable_target | |
1949 | * - used to optimize both dm_request_fn and dm_mq_queue_rq | |
1950 | */ | |
1951 | md->immutable_target = dm_table_get_immutable_target(t); | |
1952 | } | |
e6ee8c0b KU |
1953 | |
1954 | __bind_mempools(md, t); | |
1955 | ||
a12f5d48 | 1956 | old_map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
1d3aa6f6 | 1957 | rcu_assign_pointer(md->map, (void *)t); |
36a0456f AK |
1958 | md->immutable_target_type = dm_table_get_immutable_target_type(t); |
1959 | ||
754c5fc7 | 1960 | dm_table_set_restrictions(t, q, limits); |
41abc4e1 HR |
1961 | if (old_map) |
1962 | dm_sync_table(md); | |
1da177e4 | 1963 | |
042d2a9b | 1964 | return old_map; |
1da177e4 LT |
1965 | } |
1966 | ||
a7940155 AK |
1967 | /* |
1968 | * Returns unbound table for the caller to free. | |
1969 | */ | |
1970 | static struct dm_table *__unbind(struct mapped_device *md) | |
1da177e4 | 1971 | { |
a12f5d48 | 1972 | struct dm_table *map = rcu_dereference_protected(md->map, 1); |
1da177e4 LT |
1973 | |
1974 | if (!map) | |
a7940155 | 1975 | return NULL; |
1da177e4 LT |
1976 | |
1977 | dm_table_event_callback(map, NULL, NULL); | |
9cdb8520 | 1978 | RCU_INIT_POINTER(md->map, NULL); |
83d5e5b0 | 1979 | dm_sync_table(md); |
a7940155 AK |
1980 | |
1981 | return map; | |
1da177e4 LT |
1982 | } |
1983 | ||
1984 | /* | |
1985 | * Constructor for a new device. | |
1986 | */ | |
2b06cfff | 1987 | int dm_create(int minor, struct mapped_device **result) |
1da177e4 LT |
1988 | { |
1989 | struct mapped_device *md; | |
1990 | ||
2b06cfff | 1991 | md = alloc_dev(minor); |
1da177e4 LT |
1992 | if (!md) |
1993 | return -ENXIO; | |
1994 | ||
784aae73 MB |
1995 | dm_sysfs_init(md); |
1996 | ||
1da177e4 LT |
1997 | *result = md; |
1998 | return 0; | |
1999 | } | |
2000 | ||
a5664dad MS |
2001 | /* |
2002 | * Functions to manage md->type. | |
2003 | * All are required to hold md->type_lock. | |
2004 | */ | |
2005 | void dm_lock_md_type(struct mapped_device *md) | |
2006 | { | |
2007 | mutex_lock(&md->type_lock); | |
2008 | } | |
2009 | ||
2010 | void dm_unlock_md_type(struct mapped_device *md) | |
2011 | { | |
2012 | mutex_unlock(&md->type_lock); | |
2013 | } | |
2014 | ||
7e0d574f | 2015 | void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type) |
a5664dad | 2016 | { |
00c4fc3b | 2017 | BUG_ON(!mutex_is_locked(&md->type_lock)); |
a5664dad MS |
2018 | md->type = type; |
2019 | } | |
2020 | ||
7e0d574f | 2021 | enum dm_queue_mode dm_get_md_type(struct mapped_device *md) |
a5664dad MS |
2022 | { |
2023 | return md->type; | |
2024 | } | |
2025 | ||
36a0456f AK |
2026 | struct target_type *dm_get_immutable_target_type(struct mapped_device *md) |
2027 | { | |
2028 | return md->immutable_target_type; | |
2029 | } | |
2030 | ||
f84cb8a4 MS |
2031 | /* |
2032 | * The queue_limits are only valid as long as you have a reference | |
2033 | * count on 'md'. | |
2034 | */ | |
2035 | struct queue_limits *dm_get_queue_limits(struct mapped_device *md) | |
2036 | { | |
2037 | BUG_ON(!atomic_read(&md->holders)); | |
2038 | return &md->queue->limits; | |
2039 | } | |
2040 | EXPORT_SYMBOL_GPL(dm_get_queue_limits); | |
2041 | ||
4a0b4ddf MS |
2042 | /* |
2043 | * Setup the DM device's queue based on md's type | |
2044 | */ | |
591ddcfc | 2045 | int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t) |
4a0b4ddf | 2046 | { |
bfebd1cd | 2047 | int r; |
7e0d574f | 2048 | enum dm_queue_mode type = dm_get_md_type(md); |
bfebd1cd | 2049 | |
545ed20e | 2050 | switch (type) { |
bfebd1cd | 2051 | case DM_TYPE_REQUEST_BASED: |
eb8db831 | 2052 | r = dm_old_init_request_queue(md, t); |
bfebd1cd | 2053 | if (r) { |
eca7ee6d | 2054 | DMERR("Cannot initialize queue for request-based mapped device"); |
bfebd1cd | 2055 | return r; |
ff36ab34 | 2056 | } |
bfebd1cd MS |
2057 | break; |
2058 | case DM_TYPE_MQ_REQUEST_BASED: | |
e83068a5 | 2059 | r = dm_mq_init_request_queue(md, t); |
bfebd1cd | 2060 | if (r) { |
eca7ee6d | 2061 | DMERR("Cannot initialize queue for request-based dm-mq mapped device"); |
bfebd1cd MS |
2062 | return r; |
2063 | } | |
2064 | break; | |
2065 | case DM_TYPE_BIO_BASED: | |
545ed20e | 2066 | case DM_TYPE_DAX_BIO_BASED: |
eca7ee6d | 2067 | dm_init_normal_md_queue(md); |
ff36ab34 | 2068 | blk_queue_make_request(md->queue, dm_make_request); |
dbba42d8 MP |
2069 | /* |
2070 | * DM handles splitting bios as needed. Free the bio_split bioset | |
2071 | * since it won't be used (saves 1 process per bio-based DM device). | |
2072 | */ | |
2073 | bioset_free(md->queue->bio_split); | |
2074 | md->queue->bio_split = NULL; | |
545ed20e TK |
2075 | |
2076 | if (type == DM_TYPE_DAX_BIO_BASED) | |
2077 | queue_flag_set_unlocked(QUEUE_FLAG_DAX, md->queue); | |
bfebd1cd | 2078 | break; |
7e0d574f BVA |
2079 | case DM_TYPE_NONE: |
2080 | WARN_ON_ONCE(true); | |
2081 | break; | |
4a0b4ddf MS |
2082 | } |
2083 | ||
2084 | return 0; | |
2085 | } | |
2086 | ||
2bec1f4a | 2087 | struct mapped_device *dm_get_md(dev_t dev) |
1da177e4 LT |
2088 | { |
2089 | struct mapped_device *md; | |
1da177e4 LT |
2090 | unsigned minor = MINOR(dev); |
2091 | ||
2092 | if (MAJOR(dev) != _major || minor >= (1 << MINORBITS)) | |
2093 | return NULL; | |
2094 | ||
f32c10b0 | 2095 | spin_lock(&_minor_lock); |
1da177e4 LT |
2096 | |
2097 | md = idr_find(&_minor_idr, minor); | |
2bec1f4a MP |
2098 | if (md) { |
2099 | if ((md == MINOR_ALLOCED || | |
2100 | (MINOR(disk_devt(dm_disk(md))) != minor) || | |
2101 | dm_deleting_md(md) || | |
2102 | test_bit(DMF_FREEING, &md->flags))) { | |
2103 | md = NULL; | |
2104 | goto out; | |
2105 | } | |
2106 | dm_get(md); | |
fba9f90e | 2107 | } |
1da177e4 | 2108 | |
fba9f90e | 2109 | out: |
f32c10b0 | 2110 | spin_unlock(&_minor_lock); |
1da177e4 | 2111 | |
637842cf DT |
2112 | return md; |
2113 | } | |
3cf2e4ba | 2114 | EXPORT_SYMBOL_GPL(dm_get_md); |
d229a958 | 2115 | |
9ade92a9 | 2116 | void *dm_get_mdptr(struct mapped_device *md) |
637842cf | 2117 | { |
9ade92a9 | 2118 | return md->interface_ptr; |
1da177e4 LT |
2119 | } |
2120 | ||
2121 | void dm_set_mdptr(struct mapped_device *md, void *ptr) | |
2122 | { | |
2123 | md->interface_ptr = ptr; | |
2124 | } | |
2125 | ||
2126 | void dm_get(struct mapped_device *md) | |
2127 | { | |
2128 | atomic_inc(&md->holders); | |
3f77316d | 2129 | BUG_ON(test_bit(DMF_FREEING, &md->flags)); |
1da177e4 LT |
2130 | } |
2131 | ||
09ee96b2 MP |
2132 | int dm_hold(struct mapped_device *md) |
2133 | { | |
2134 | spin_lock(&_minor_lock); | |
2135 | if (test_bit(DMF_FREEING, &md->flags)) { | |
2136 | spin_unlock(&_minor_lock); | |
2137 | return -EBUSY; | |
2138 | } | |
2139 | dm_get(md); | |
2140 | spin_unlock(&_minor_lock); | |
2141 | return 0; | |
2142 | } | |
2143 | EXPORT_SYMBOL_GPL(dm_hold); | |
2144 | ||
72d94861 AK |
2145 | const char *dm_device_name(struct mapped_device *md) |
2146 | { | |
2147 | return md->name; | |
2148 | } | |
2149 | EXPORT_SYMBOL_GPL(dm_device_name); | |
2150 | ||
3f77316d | 2151 | static void __dm_destroy(struct mapped_device *md, bool wait) |
1da177e4 | 2152 | { |
3b785fbc | 2153 | struct request_queue *q = dm_get_md_queue(md); |
1134e5ae | 2154 | struct dm_table *map; |
83d5e5b0 | 2155 | int srcu_idx; |
1da177e4 | 2156 | |
3f77316d | 2157 | might_sleep(); |
fba9f90e | 2158 | |
63a4f065 | 2159 | spin_lock(&_minor_lock); |
3f77316d KU |
2160 | idr_replace(&_minor_idr, MINOR_ALLOCED, MINOR(disk_devt(dm_disk(md)))); |
2161 | set_bit(DMF_FREEING, &md->flags); | |
2162 | spin_unlock(&_minor_lock); | |
3b785fbc | 2163 | |
2e91c369 | 2164 | blk_set_queue_dying(q); |
3f77316d | 2165 | |
02233342 | 2166 | if (dm_request_based(md) && md->kworker_task) |
3989144f | 2167 | kthread_flush_worker(&md->kworker); |
2eb6e1e3 | 2168 | |
ab7c7bb6 MP |
2169 | /* |
2170 | * Take suspend_lock so that presuspend and postsuspend methods | |
2171 | * do not race with internal suspend. | |
2172 | */ | |
2173 | mutex_lock(&md->suspend_lock); | |
2a708cff | 2174 | map = dm_get_live_table(md, &srcu_idx); |
3f77316d KU |
2175 | if (!dm_suspended_md(md)) { |
2176 | dm_table_presuspend_targets(map); | |
2177 | dm_table_postsuspend_targets(map); | |
1da177e4 | 2178 | } |
83d5e5b0 MP |
2179 | /* dm_put_live_table must be before msleep, otherwise deadlock is possible */ |
2180 | dm_put_live_table(md, srcu_idx); | |
2a708cff | 2181 | mutex_unlock(&md->suspend_lock); |
83d5e5b0 | 2182 | |
3f77316d KU |
2183 | /* |
2184 | * Rare, but there may be I/O requests still going to complete, | |
2185 | * for example. Wait for all references to disappear. | |
2186 | * No one should increment the reference count of the mapped_device, | |
2187 | * after the mapped_device state becomes DMF_FREEING. | |
2188 | */ | |
2189 | if (wait) | |
2190 | while (atomic_read(&md->holders)) | |
2191 | msleep(1); | |
2192 | else if (atomic_read(&md->holders)) | |
2193 | DMWARN("%s: Forcibly removing mapped_device still in use! (%d users)", | |
2194 | dm_device_name(md), atomic_read(&md->holders)); | |
2195 | ||
2196 | dm_sysfs_exit(md); | |
3f77316d KU |
2197 | dm_table_destroy(__unbind(md)); |
2198 | free_dev(md); | |
2199 | } | |
2200 | ||
2201 | void dm_destroy(struct mapped_device *md) | |
2202 | { | |
2203 | __dm_destroy(md, true); | |
2204 | } | |
2205 | ||
2206 | void dm_destroy_immediate(struct mapped_device *md) | |
2207 | { | |
2208 | __dm_destroy(md, false); | |
2209 | } | |
2210 | ||
2211 | void dm_put(struct mapped_device *md) | |
2212 | { | |
2213 | atomic_dec(&md->holders); | |
1da177e4 | 2214 | } |
79eb885c | 2215 | EXPORT_SYMBOL_GPL(dm_put); |
1da177e4 | 2216 | |
b48633f8 | 2217 | static int dm_wait_for_completion(struct mapped_device *md, long task_state) |
46125c1c MB |
2218 | { |
2219 | int r = 0; | |
9f4c3f87 | 2220 | DEFINE_WAIT(wait); |
46125c1c MB |
2221 | |
2222 | while (1) { | |
9f4c3f87 | 2223 | prepare_to_wait(&md->wait, &wait, task_state); |
46125c1c | 2224 | |
b4324fee | 2225 | if (!md_in_flight(md)) |
46125c1c MB |
2226 | break; |
2227 | ||
e3fabdfd | 2228 | if (signal_pending_state(task_state, current)) { |
46125c1c MB |
2229 | r = -EINTR; |
2230 | break; | |
2231 | } | |
2232 | ||
2233 | io_schedule(); | |
2234 | } | |
9f4c3f87 | 2235 | finish_wait(&md->wait, &wait); |
b44ebeb0 | 2236 | |
46125c1c MB |
2237 | return r; |
2238 | } | |
2239 | ||
1da177e4 LT |
2240 | /* |
2241 | * Process the deferred bios | |
2242 | */ | |
ef208587 | 2243 | static void dm_wq_work(struct work_struct *work) |
1da177e4 | 2244 | { |
ef208587 MP |
2245 | struct mapped_device *md = container_of(work, struct mapped_device, |
2246 | work); | |
6d6f10df | 2247 | struct bio *c; |
83d5e5b0 MP |
2248 | int srcu_idx; |
2249 | struct dm_table *map; | |
1da177e4 | 2250 | |
83d5e5b0 | 2251 | map = dm_get_live_table(md, &srcu_idx); |
ef208587 | 2252 | |
3b00b203 | 2253 | while (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) { |
df12ee99 AK |
2254 | spin_lock_irq(&md->deferred_lock); |
2255 | c = bio_list_pop(&md->deferred); | |
2256 | spin_unlock_irq(&md->deferred_lock); | |
2257 | ||
6a8736d1 | 2258 | if (!c) |
df12ee99 | 2259 | break; |
022c2611 | 2260 | |
e6ee8c0b KU |
2261 | if (dm_request_based(md)) |
2262 | generic_make_request(c); | |
6a8736d1 | 2263 | else |
83d5e5b0 | 2264 | __split_and_process_bio(md, map, c); |
022c2611 | 2265 | } |
73d410c0 | 2266 | |
83d5e5b0 | 2267 | dm_put_live_table(md, srcu_idx); |
1da177e4 LT |
2268 | } |
2269 | ||
9a1fb464 | 2270 | static void dm_queue_flush(struct mapped_device *md) |
304f3f6a | 2271 | { |
3b00b203 | 2272 | clear_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
4e857c58 | 2273 | smp_mb__after_atomic(); |
53d5914f | 2274 | queue_work(md->wq, &md->work); |
304f3f6a MB |
2275 | } |
2276 | ||
1da177e4 | 2277 | /* |
042d2a9b | 2278 | * Swap in a new table, returning the old one for the caller to destroy. |
1da177e4 | 2279 | */ |
042d2a9b | 2280 | struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table) |
1da177e4 | 2281 | { |
87eb5b21 | 2282 | struct dm_table *live_map = NULL, *map = ERR_PTR(-EINVAL); |
754c5fc7 | 2283 | struct queue_limits limits; |
042d2a9b | 2284 | int r; |
1da177e4 | 2285 | |
e61290a4 | 2286 | mutex_lock(&md->suspend_lock); |
1da177e4 LT |
2287 | |
2288 | /* device must be suspended */ | |
4f186f8b | 2289 | if (!dm_suspended_md(md)) |
93c534ae | 2290 | goto out; |
1da177e4 | 2291 | |
3ae70656 MS |
2292 | /* |
2293 | * If the new table has no data devices, retain the existing limits. | |
2294 | * This helps multipath with queue_if_no_path if all paths disappear, | |
2295 | * then new I/O is queued based on these limits, and then some paths | |
2296 | * reappear. | |
2297 | */ | |
2298 | if (dm_table_has_no_data_devices(table)) { | |
83d5e5b0 | 2299 | live_map = dm_get_live_table_fast(md); |
3ae70656 MS |
2300 | if (live_map) |
2301 | limits = md->queue->limits; | |
83d5e5b0 | 2302 | dm_put_live_table_fast(md); |
3ae70656 MS |
2303 | } |
2304 | ||
87eb5b21 MC |
2305 | if (!live_map) { |
2306 | r = dm_calculate_queue_limits(table, &limits); | |
2307 | if (r) { | |
2308 | map = ERR_PTR(r); | |
2309 | goto out; | |
2310 | } | |
042d2a9b | 2311 | } |
754c5fc7 | 2312 | |
042d2a9b | 2313 | map = __bind(md, table, &limits); |
1da177e4 | 2314 | |
93c534ae | 2315 | out: |
e61290a4 | 2316 | mutex_unlock(&md->suspend_lock); |
042d2a9b | 2317 | return map; |
1da177e4 LT |
2318 | } |
2319 | ||
2320 | /* | |
2321 | * Functions to lock and unlock any filesystem running on the | |
2322 | * device. | |
2323 | */ | |
2ca3310e | 2324 | static int lock_fs(struct mapped_device *md) |
1da177e4 | 2325 | { |
e39e2e95 | 2326 | int r; |
1da177e4 LT |
2327 | |
2328 | WARN_ON(md->frozen_sb); | |
dfbe03f6 | 2329 | |
db8fef4f | 2330 | md->frozen_sb = freeze_bdev(md->bdev); |
dfbe03f6 | 2331 | if (IS_ERR(md->frozen_sb)) { |
cf222b37 | 2332 | r = PTR_ERR(md->frozen_sb); |
e39e2e95 AK |
2333 | md->frozen_sb = NULL; |
2334 | return r; | |
dfbe03f6 AK |
2335 | } |
2336 | ||
aa8d7c2f AK |
2337 | set_bit(DMF_FROZEN, &md->flags); |
2338 | ||
1da177e4 LT |
2339 | return 0; |
2340 | } | |
2341 | ||
2ca3310e | 2342 | static void unlock_fs(struct mapped_device *md) |
1da177e4 | 2343 | { |
aa8d7c2f AK |
2344 | if (!test_bit(DMF_FROZEN, &md->flags)) |
2345 | return; | |
2346 | ||
db8fef4f | 2347 | thaw_bdev(md->bdev, md->frozen_sb); |
1da177e4 | 2348 | md->frozen_sb = NULL; |
aa8d7c2f | 2349 | clear_bit(DMF_FROZEN, &md->flags); |
1da177e4 LT |
2350 | } |
2351 | ||
2352 | /* | |
b48633f8 BVA |
2353 | * @suspend_flags: DM_SUSPEND_LOCKFS_FLAG and/or DM_SUSPEND_NOFLUSH_FLAG |
2354 | * @task_state: e.g. TASK_INTERRUPTIBLE or TASK_UNINTERRUPTIBLE | |
2355 | * @dmf_suspended_flag: DMF_SUSPENDED or DMF_SUSPENDED_INTERNALLY | |
2356 | * | |
ffcc3936 MS |
2357 | * If __dm_suspend returns 0, the device is completely quiescent |
2358 | * now. There is no request-processing activity. All new requests | |
2359 | * are being added to md->deferred list. | |
cec47e3d | 2360 | */ |
ffcc3936 | 2361 | static int __dm_suspend(struct mapped_device *md, struct dm_table *map, |
b48633f8 | 2362 | unsigned suspend_flags, long task_state, |
eaf9a736 | 2363 | int dmf_suspended_flag) |
1da177e4 | 2364 | { |
ffcc3936 MS |
2365 | bool do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG; |
2366 | bool noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG; | |
2367 | int r; | |
1da177e4 | 2368 | |
5a8f1f80 BVA |
2369 | lockdep_assert_held(&md->suspend_lock); |
2370 | ||
2e93ccc1 KU |
2371 | /* |
2372 | * DMF_NOFLUSH_SUSPENDING must be set before presuspend. | |
2373 | * This flag is cleared before dm_suspend returns. | |
2374 | */ | |
2375 | if (noflush) | |
2376 | set_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); | |
86331f39 BVA |
2377 | else |
2378 | pr_debug("%s: suspending with flush\n", dm_device_name(md)); | |
2e93ccc1 | 2379 | |
d67ee213 MS |
2380 | /* |
2381 | * This gets reverted if there's an error later and the targets | |
2382 | * provide the .presuspend_undo hook. | |
2383 | */ | |
cf222b37 AK |
2384 | dm_table_presuspend_targets(map); |
2385 | ||
32a926da | 2386 | /* |
9f518b27 KU |
2387 | * Flush I/O to the device. |
2388 | * Any I/O submitted after lock_fs() may not be flushed. | |
2389 | * noflush takes precedence over do_lockfs. | |
2390 | * (lock_fs() flushes I/Os and waits for them to complete.) | |
32a926da MP |
2391 | */ |
2392 | if (!noflush && do_lockfs) { | |
2393 | r = lock_fs(md); | |
d67ee213 MS |
2394 | if (r) { |
2395 | dm_table_presuspend_undo_targets(map); | |
ffcc3936 | 2396 | return r; |
d67ee213 | 2397 | } |
aa8d7c2f | 2398 | } |
1da177e4 LT |
2399 | |
2400 | /* | |
3b00b203 MP |
2401 | * Here we must make sure that no processes are submitting requests |
2402 | * to target drivers i.e. no one may be executing | |
2403 | * __split_and_process_bio. This is called from dm_request and | |
2404 | * dm_wq_work. | |
2405 | * | |
2406 | * To get all processes out of __split_and_process_bio in dm_request, | |
2407 | * we take the write lock. To prevent any process from reentering | |
6a8736d1 TH |
2408 | * __split_and_process_bio from dm_request and quiesce the thread |
2409 | * (dm_wq_work), we set BMF_BLOCK_IO_FOR_SUSPEND and call | |
2410 | * flush_workqueue(md->wq). | |
1da177e4 | 2411 | */ |
1eb787ec | 2412 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); |
41abc4e1 HR |
2413 | if (map) |
2414 | synchronize_srcu(&md->io_barrier); | |
1da177e4 | 2415 | |
d0bcb878 | 2416 | /* |
29e4013d TH |
2417 | * Stop md->queue before flushing md->wq in case request-based |
2418 | * dm defers requests to md->wq from md->queue. | |
d0bcb878 | 2419 | */ |
2eb6e1e3 | 2420 | if (dm_request_based(md)) { |
eca7ee6d | 2421 | dm_stop_queue(md->queue); |
02233342 | 2422 | if (md->kworker_task) |
3989144f | 2423 | kthread_flush_worker(&md->kworker); |
2eb6e1e3 | 2424 | } |
cec47e3d | 2425 | |
d0bcb878 KU |
2426 | flush_workqueue(md->wq); |
2427 | ||
1da177e4 | 2428 | /* |
3b00b203 MP |
2429 | * At this point no more requests are entering target request routines. |
2430 | * We call dm_wait_for_completion to wait for all existing requests | |
2431 | * to finish. | |
1da177e4 | 2432 | */ |
b48633f8 | 2433 | r = dm_wait_for_completion(md, task_state); |
eaf9a736 MS |
2434 | if (!r) |
2435 | set_bit(dmf_suspended_flag, &md->flags); | |
1da177e4 | 2436 | |
6d6f10df | 2437 | if (noflush) |
022c2611 | 2438 | clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); |
41abc4e1 HR |
2439 | if (map) |
2440 | synchronize_srcu(&md->io_barrier); | |
2e93ccc1 | 2441 | |
1da177e4 | 2442 | /* were we interrupted ? */ |
46125c1c | 2443 | if (r < 0) { |
9a1fb464 | 2444 | dm_queue_flush(md); |
73d410c0 | 2445 | |
cec47e3d | 2446 | if (dm_request_based(md)) |
eca7ee6d | 2447 | dm_start_queue(md->queue); |
cec47e3d | 2448 | |
2ca3310e | 2449 | unlock_fs(md); |
d67ee213 | 2450 | dm_table_presuspend_undo_targets(map); |
ffcc3936 | 2451 | /* pushback list is already flushed, so skip flush */ |
2ca3310e | 2452 | } |
1da177e4 | 2453 | |
ffcc3936 MS |
2454 | return r; |
2455 | } | |
2456 | ||
2457 | /* | |
2458 | * We need to be able to change a mapping table under a mounted | |
2459 | * filesystem. For example we might want to move some data in | |
2460 | * the background. Before the table can be swapped with | |
2461 | * dm_bind_table, dm_suspend must be called to flush any in | |
2462 | * flight bios and ensure that any further io gets deferred. | |
2463 | */ | |
2464 | /* | |
2465 | * Suspend mechanism in request-based dm. | |
2466 | * | |
2467 | * 1. Flush all I/Os by lock_fs() if needed. | |
2468 | * 2. Stop dispatching any I/O by stopping the request_queue. | |
2469 | * 3. Wait for all in-flight I/Os to be completed or requeued. | |
2470 | * | |
2471 | * To abort suspend, start the request_queue. | |
2472 | */ | |
2473 | int dm_suspend(struct mapped_device *md, unsigned suspend_flags) | |
2474 | { | |
2475 | struct dm_table *map = NULL; | |
2476 | int r = 0; | |
2477 | ||
2478 | retry: | |
2479 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); | |
2480 | ||
2481 | if (dm_suspended_md(md)) { | |
2482 | r = -EINVAL; | |
2483 | goto out_unlock; | |
2484 | } | |
2485 | ||
2486 | if (dm_suspended_internally_md(md)) { | |
2487 | /* already internally suspended, wait for internal resume */ | |
2488 | mutex_unlock(&md->suspend_lock); | |
2489 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); | |
2490 | if (r) | |
2491 | return r; | |
2492 | goto retry; | |
2493 | } | |
2494 | ||
a12f5d48 | 2495 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
ffcc3936 | 2496 | |
eaf9a736 | 2497 | r = __dm_suspend(md, map, suspend_flags, TASK_INTERRUPTIBLE, DMF_SUSPENDED); |
ffcc3936 MS |
2498 | if (r) |
2499 | goto out_unlock; | |
3b00b203 | 2500 | |
4d4471cb KU |
2501 | dm_table_postsuspend_targets(map); |
2502 | ||
d287483d | 2503 | out_unlock: |
e61290a4 | 2504 | mutex_unlock(&md->suspend_lock); |
cf222b37 | 2505 | return r; |
1da177e4 LT |
2506 | } |
2507 | ||
ffcc3936 MS |
2508 | static int __dm_resume(struct mapped_device *md, struct dm_table *map) |
2509 | { | |
2510 | if (map) { | |
2511 | int r = dm_table_resume_targets(map); | |
2512 | if (r) | |
2513 | return r; | |
2514 | } | |
2515 | ||
2516 | dm_queue_flush(md); | |
2517 | ||
2518 | /* | |
2519 | * Flushing deferred I/Os must be done after targets are resumed | |
2520 | * so that mapping of targets can work correctly. | |
2521 | * Request-based dm is queueing the deferred I/Os in its request_queue. | |
2522 | */ | |
2523 | if (dm_request_based(md)) | |
eca7ee6d | 2524 | dm_start_queue(md->queue); |
ffcc3936 MS |
2525 | |
2526 | unlock_fs(md); | |
2527 | ||
2528 | return 0; | |
2529 | } | |
2530 | ||
1da177e4 LT |
2531 | int dm_resume(struct mapped_device *md) |
2532 | { | |
8dc23658 | 2533 | int r; |
cf222b37 | 2534 | struct dm_table *map = NULL; |
1da177e4 | 2535 | |
ffcc3936 | 2536 | retry: |
8dc23658 | 2537 | r = -EINVAL; |
ffcc3936 MS |
2538 | mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); |
2539 | ||
4f186f8b | 2540 | if (!dm_suspended_md(md)) |
cf222b37 | 2541 | goto out; |
cf222b37 | 2542 | |
ffcc3936 MS |
2543 | if (dm_suspended_internally_md(md)) { |
2544 | /* already internally suspended, wait for internal resume */ | |
2545 | mutex_unlock(&md->suspend_lock); | |
2546 | r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); | |
2547 | if (r) | |
2548 | return r; | |
2549 | goto retry; | |
2550 | } | |
2551 | ||
a12f5d48 | 2552 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
2ca3310e | 2553 | if (!map || !dm_table_get_size(map)) |
cf222b37 | 2554 | goto out; |
1da177e4 | 2555 | |
ffcc3936 | 2556 | r = __dm_resume(md, map); |
8757b776 MB |
2557 | if (r) |
2558 | goto out; | |
2ca3310e | 2559 | |
2ca3310e | 2560 | clear_bit(DMF_SUSPENDED, &md->flags); |
cf222b37 | 2561 | out: |
e61290a4 | 2562 | mutex_unlock(&md->suspend_lock); |
2ca3310e | 2563 | |
cf222b37 | 2564 | return r; |
1da177e4 LT |
2565 | } |
2566 | ||
fd2ed4d2 MP |
2567 | /* |
2568 | * Internal suspend/resume works like userspace-driven suspend. It waits | |
2569 | * until all bios finish and prevents issuing new bios to the target drivers. | |
2570 | * It may be used only from the kernel. | |
fd2ed4d2 MP |
2571 | */ |
2572 | ||
ffcc3936 | 2573 | static void __dm_internal_suspend(struct mapped_device *md, unsigned suspend_flags) |
fd2ed4d2 | 2574 | { |
ffcc3936 MS |
2575 | struct dm_table *map = NULL; |
2576 | ||
1ea0654e BVA |
2577 | lockdep_assert_held(&md->suspend_lock); |
2578 | ||
96b26c8c | 2579 | if (md->internal_suspend_count++) |
ffcc3936 MS |
2580 | return; /* nested internal suspend */ |
2581 | ||
2582 | if (dm_suspended_md(md)) { | |
2583 | set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2584 | return; /* nest suspend */ | |
2585 | } | |
2586 | ||
a12f5d48 | 2587 | map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); |
ffcc3936 MS |
2588 | |
2589 | /* | |
2590 | * Using TASK_UNINTERRUPTIBLE because only NOFLUSH internal suspend is | |
2591 | * supported. Properly supporting a TASK_INTERRUPTIBLE internal suspend | |
2592 | * would require changing .presuspend to return an error -- avoid this | |
2593 | * until there is a need for more elaborate variants of internal suspend. | |
2594 | */ | |
eaf9a736 MS |
2595 | (void) __dm_suspend(md, map, suspend_flags, TASK_UNINTERRUPTIBLE, |
2596 | DMF_SUSPENDED_INTERNALLY); | |
ffcc3936 MS |
2597 | |
2598 | dm_table_postsuspend_targets(map); | |
2599 | } | |
2600 | ||
2601 | static void __dm_internal_resume(struct mapped_device *md) | |
2602 | { | |
96b26c8c MP |
2603 | BUG_ON(!md->internal_suspend_count); |
2604 | ||
2605 | if (--md->internal_suspend_count) | |
ffcc3936 MS |
2606 | return; /* resume from nested internal suspend */ |
2607 | ||
fd2ed4d2 | 2608 | if (dm_suspended_md(md)) |
ffcc3936 MS |
2609 | goto done; /* resume from nested suspend */ |
2610 | ||
2611 | /* | |
2612 | * NOTE: existing callers don't need to call dm_table_resume_targets | |
2613 | * (which may fail -- so best to avoid it for now by passing NULL map) | |
2614 | */ | |
2615 | (void) __dm_resume(md, NULL); | |
2616 | ||
2617 | done: | |
2618 | clear_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2619 | smp_mb__after_atomic(); | |
2620 | wake_up_bit(&md->flags, DMF_SUSPENDED_INTERNALLY); | |
2621 | } | |
2622 | ||
2623 | void dm_internal_suspend_noflush(struct mapped_device *md) | |
2624 | { | |
2625 | mutex_lock(&md->suspend_lock); | |
2626 | __dm_internal_suspend(md, DM_SUSPEND_NOFLUSH_FLAG); | |
2627 | mutex_unlock(&md->suspend_lock); | |
2628 | } | |
2629 | EXPORT_SYMBOL_GPL(dm_internal_suspend_noflush); | |
2630 | ||
2631 | void dm_internal_resume(struct mapped_device *md) | |
2632 | { | |
2633 | mutex_lock(&md->suspend_lock); | |
2634 | __dm_internal_resume(md); | |
2635 | mutex_unlock(&md->suspend_lock); | |
2636 | } | |
2637 | EXPORT_SYMBOL_GPL(dm_internal_resume); | |
2638 | ||
2639 | /* | |
2640 | * Fast variants of internal suspend/resume hold md->suspend_lock, | |
2641 | * which prevents interaction with userspace-driven suspend. | |
2642 | */ | |
2643 | ||
2644 | void dm_internal_suspend_fast(struct mapped_device *md) | |
2645 | { | |
2646 | mutex_lock(&md->suspend_lock); | |
2647 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) | |
fd2ed4d2 MP |
2648 | return; |
2649 | ||
2650 | set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); | |
2651 | synchronize_srcu(&md->io_barrier); | |
2652 | flush_workqueue(md->wq); | |
2653 | dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE); | |
2654 | } | |
b735fede | 2655 | EXPORT_SYMBOL_GPL(dm_internal_suspend_fast); |
fd2ed4d2 | 2656 | |
ffcc3936 | 2657 | void dm_internal_resume_fast(struct mapped_device *md) |
fd2ed4d2 | 2658 | { |
ffcc3936 | 2659 | if (dm_suspended_md(md) || dm_suspended_internally_md(md)) |
fd2ed4d2 MP |
2660 | goto done; |
2661 | ||
2662 | dm_queue_flush(md); | |
2663 | ||
2664 | done: | |
2665 | mutex_unlock(&md->suspend_lock); | |
2666 | } | |
b735fede | 2667 | EXPORT_SYMBOL_GPL(dm_internal_resume_fast); |
fd2ed4d2 | 2668 | |
1da177e4 LT |
2669 | /*----------------------------------------------------------------- |
2670 | * Event notification. | |
2671 | *---------------------------------------------------------------*/ | |
3abf85b5 | 2672 | int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, |
60935eb2 | 2673 | unsigned cookie) |
69267a30 | 2674 | { |
60935eb2 MB |
2675 | char udev_cookie[DM_COOKIE_LENGTH]; |
2676 | char *envp[] = { udev_cookie, NULL }; | |
2677 | ||
2678 | if (!cookie) | |
3abf85b5 | 2679 | return kobject_uevent(&disk_to_dev(md->disk)->kobj, action); |
60935eb2 MB |
2680 | else { |
2681 | snprintf(udev_cookie, DM_COOKIE_LENGTH, "%s=%u", | |
2682 | DM_COOKIE_ENV_VAR_NAME, cookie); | |
3abf85b5 PR |
2683 | return kobject_uevent_env(&disk_to_dev(md->disk)->kobj, |
2684 | action, envp); | |
60935eb2 | 2685 | } |
69267a30 AK |
2686 | } |
2687 | ||
7a8c3d3b MA |
2688 | uint32_t dm_next_uevent_seq(struct mapped_device *md) |
2689 | { | |
2690 | return atomic_add_return(1, &md->uevent_seq); | |
2691 | } | |
2692 | ||
1da177e4 LT |
2693 | uint32_t dm_get_event_nr(struct mapped_device *md) |
2694 | { | |
2695 | return atomic_read(&md->event_nr); | |
2696 | } | |
2697 | ||
2698 | int dm_wait_event(struct mapped_device *md, int event_nr) | |
2699 | { | |
2700 | return wait_event_interruptible(md->eventq, | |
2701 | (event_nr != atomic_read(&md->event_nr))); | |
2702 | } | |
2703 | ||
7a8c3d3b MA |
2704 | void dm_uevent_add(struct mapped_device *md, struct list_head *elist) |
2705 | { | |
2706 | unsigned long flags; | |
2707 | ||
2708 | spin_lock_irqsave(&md->uevent_lock, flags); | |
2709 | list_add(elist, &md->uevent_list); | |
2710 | spin_unlock_irqrestore(&md->uevent_lock, flags); | |
2711 | } | |
2712 | ||
1da177e4 LT |
2713 | /* |
2714 | * The gendisk is only valid as long as you have a reference | |
2715 | * count on 'md'. | |
2716 | */ | |
2717 | struct gendisk *dm_disk(struct mapped_device *md) | |
2718 | { | |
2719 | return md->disk; | |
2720 | } | |
65ff5b7d | 2721 | EXPORT_SYMBOL_GPL(dm_disk); |
1da177e4 | 2722 | |
784aae73 MB |
2723 | struct kobject *dm_kobject(struct mapped_device *md) |
2724 | { | |
2995fa78 | 2725 | return &md->kobj_holder.kobj; |
784aae73 MB |
2726 | } |
2727 | ||
784aae73 MB |
2728 | struct mapped_device *dm_get_from_kobject(struct kobject *kobj) |
2729 | { | |
2730 | struct mapped_device *md; | |
2731 | ||
2995fa78 | 2732 | md = container_of(kobj, struct mapped_device, kobj_holder.kobj); |
784aae73 | 2733 | |
4d89b7b4 | 2734 | if (test_bit(DMF_FREEING, &md->flags) || |
432a212c | 2735 | dm_deleting_md(md)) |
4d89b7b4 MB |
2736 | return NULL; |
2737 | ||
784aae73 MB |
2738 | dm_get(md); |
2739 | return md; | |
2740 | } | |
2741 | ||
4f186f8b | 2742 | int dm_suspended_md(struct mapped_device *md) |
1da177e4 LT |
2743 | { |
2744 | return test_bit(DMF_SUSPENDED, &md->flags); | |
2745 | } | |
2746 | ||
ffcc3936 MS |
2747 | int dm_suspended_internally_md(struct mapped_device *md) |
2748 | { | |
2749 | return test_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); | |
2750 | } | |
2751 | ||
2c140a24 MP |
2752 | int dm_test_deferred_remove_flag(struct mapped_device *md) |
2753 | { | |
2754 | return test_bit(DMF_DEFERRED_REMOVE, &md->flags); | |
2755 | } | |
2756 | ||
64dbce58 KU |
2757 | int dm_suspended(struct dm_target *ti) |
2758 | { | |
ecdb2e25 | 2759 | return dm_suspended_md(dm_table_get_md(ti->table)); |
64dbce58 KU |
2760 | } |
2761 | EXPORT_SYMBOL_GPL(dm_suspended); | |
2762 | ||
2e93ccc1 KU |
2763 | int dm_noflush_suspending(struct dm_target *ti) |
2764 | { | |
ecdb2e25 | 2765 | return __noflush_suspending(dm_table_get_md(ti->table)); |
2e93ccc1 KU |
2766 | } |
2767 | EXPORT_SYMBOL_GPL(dm_noflush_suspending); | |
2768 | ||
7e0d574f | 2769 | struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type, |
30187e1d | 2770 | unsigned integrity, unsigned per_io_data_size) |
e6ee8c0b | 2771 | { |
115485e8 | 2772 | struct dm_md_mempools *pools = kzalloc_node(sizeof(*pools), GFP_KERNEL, md->numa_node_id); |
78d8e58a | 2773 | unsigned int pool_size = 0; |
5f015204 | 2774 | unsigned int front_pad; |
e6ee8c0b KU |
2775 | |
2776 | if (!pools) | |
4e6e36c3 | 2777 | return NULL; |
e6ee8c0b | 2778 | |
78d8e58a MS |
2779 | switch (type) { |
2780 | case DM_TYPE_BIO_BASED: | |
545ed20e | 2781 | case DM_TYPE_DAX_BIO_BASED: |
78d8e58a | 2782 | pool_size = dm_get_reserved_bio_based_ios(); |
30187e1d | 2783 | front_pad = roundup(per_io_data_size, __alignof__(struct dm_target_io)) + offsetof(struct dm_target_io, clone); |
eb8db831 CH |
2784 | |
2785 | pools->io_pool = mempool_create_slab_pool(pool_size, _io_cache); | |
2786 | if (!pools->io_pool) | |
2787 | goto out; | |
78d8e58a MS |
2788 | break; |
2789 | case DM_TYPE_REQUEST_BASED: | |
78d8e58a | 2790 | case DM_TYPE_MQ_REQUEST_BASED: |
eb8db831 | 2791 | pool_size = dm_get_reserved_rq_based_ios(); |
78d8e58a | 2792 | front_pad = offsetof(struct dm_rq_clone_bio_info, clone); |
591ddcfc | 2793 | /* per_io_data_size is used for blk-mq pdu at queue allocation */ |
78d8e58a MS |
2794 | break; |
2795 | default: | |
2796 | BUG(); | |
2797 | } | |
2798 | ||
47e0fb46 | 2799 | pools->bs = bioset_create(pool_size, front_pad, BIOSET_NEED_RESCUER); |
e6ee8c0b | 2800 | if (!pools->bs) |
5f015204 | 2801 | goto out; |
e6ee8c0b | 2802 | |
a91a2785 | 2803 | if (integrity && bioset_integrity_create(pools->bs, pool_size)) |
5f015204 | 2804 | goto out; |
a91a2785 | 2805 | |
e6ee8c0b | 2806 | return pools; |
5f1b670d | 2807 | |
5f1b670d CH |
2808 | out: |
2809 | dm_free_md_mempools(pools); | |
78d8e58a | 2810 | |
4e6e36c3 | 2811 | return NULL; |
e6ee8c0b KU |
2812 | } |
2813 | ||
2814 | void dm_free_md_mempools(struct dm_md_mempools *pools) | |
2815 | { | |
2816 | if (!pools) | |
2817 | return; | |
2818 | ||
6f65985e | 2819 | mempool_destroy(pools->io_pool); |
1ae49ea2 | 2820 | |
e6ee8c0b KU |
2821 | if (pools->bs) |
2822 | bioset_free(pools->bs); | |
2823 | ||
2824 | kfree(pools); | |
2825 | } | |
2826 | ||
9c72bad1 CH |
2827 | struct dm_pr { |
2828 | u64 old_key; | |
2829 | u64 new_key; | |
2830 | u32 flags; | |
2831 | bool fail_early; | |
2832 | }; | |
2833 | ||
2834 | static int dm_call_pr(struct block_device *bdev, iterate_devices_callout_fn fn, | |
2835 | void *data) | |
71cdb697 CH |
2836 | { |
2837 | struct mapped_device *md = bdev->bd_disk->private_data; | |
9c72bad1 CH |
2838 | struct dm_table *table; |
2839 | struct dm_target *ti; | |
2840 | int ret = -ENOTTY, srcu_idx; | |
71cdb697 | 2841 | |
9c72bad1 CH |
2842 | table = dm_get_live_table(md, &srcu_idx); |
2843 | if (!table || !dm_table_get_size(table)) | |
2844 | goto out; | |
71cdb697 | 2845 | |
9c72bad1 CH |
2846 | /* We only support devices that have a single target */ |
2847 | if (dm_table_get_num_targets(table) != 1) | |
2848 | goto out; | |
2849 | ti = dm_table_get_target(table, 0); | |
71cdb697 | 2850 | |
9c72bad1 CH |
2851 | ret = -EINVAL; |
2852 | if (!ti->type->iterate_devices) | |
2853 | goto out; | |
2854 | ||
2855 | ret = ti->type->iterate_devices(ti, fn, data); | |
2856 | out: | |
2857 | dm_put_live_table(md, srcu_idx); | |
2858 | return ret; | |
2859 | } | |
2860 | ||
2861 | /* | |
2862 | * For register / unregister we need to manually call out to every path. | |
2863 | */ | |
2864 | static int __dm_pr_register(struct dm_target *ti, struct dm_dev *dev, | |
2865 | sector_t start, sector_t len, void *data) | |
2866 | { | |
2867 | struct dm_pr *pr = data; | |
2868 | const struct pr_ops *ops = dev->bdev->bd_disk->fops->pr_ops; | |
2869 | ||
2870 | if (!ops || !ops->pr_register) | |
2871 | return -EOPNOTSUPP; | |
2872 | return ops->pr_register(dev->bdev, pr->old_key, pr->new_key, pr->flags); | |
2873 | } | |
2874 | ||
2875 | static int dm_pr_register(struct block_device *bdev, u64 old_key, u64 new_key, | |
2876 | u32 flags) | |
2877 | { | |
2878 | struct dm_pr pr = { | |
2879 | .old_key = old_key, | |
2880 | .new_key = new_key, | |
2881 | .flags = flags, | |
2882 | .fail_early = true, | |
2883 | }; | |
2884 | int ret; | |
2885 | ||
2886 | ret = dm_call_pr(bdev, __dm_pr_register, &pr); | |
2887 | if (ret && new_key) { | |
2888 | /* unregister all paths if we failed to register any path */ | |
2889 | pr.old_key = new_key; | |
2890 | pr.new_key = 0; | |
2891 | pr.flags = 0; | |
2892 | pr.fail_early = false; | |
2893 | dm_call_pr(bdev, __dm_pr_register, &pr); | |
2894 | } | |
2895 | ||
2896 | return ret; | |
71cdb697 CH |
2897 | } |
2898 | ||
2899 | static int dm_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type, | |
956a4025 | 2900 | u32 flags) |
71cdb697 CH |
2901 | { |
2902 | struct mapped_device *md = bdev->bd_disk->private_data; | |
2903 | const struct pr_ops *ops; | |
71cdb697 | 2904 | fmode_t mode; |
956a4025 | 2905 | int r; |
71cdb697 | 2906 | |
956a4025 | 2907 | r = dm_grab_bdev_for_ioctl(md, &bdev, &mode); |
71cdb697 CH |
2908 | if (r < 0) |
2909 | return r; | |
2910 | ||
2911 | ops = bdev->bd_disk->fops->pr_ops; | |
2912 | if (ops && ops->pr_reserve) | |
2913 | r = ops->pr_reserve(bdev, key, type, flags); | |
2914 | else | |
2915 | r = -EOPNOTSUPP; | |
2916 | ||
956a4025 | 2917 | bdput(bdev); |
71cdb697 CH |
2918 | return r; |
2919 | } | |
2920 | ||
2921 | static int dm_pr_release(struct block_device *bdev, u64 key, enum pr_type type) | |
2922 | { | |
2923 | struct mapped_device *md = bdev->bd_disk->private_data; | |
2924 | const struct pr_ops *ops; | |
71cdb697 | 2925 | fmode_t mode; |
956a4025 | 2926 | int r; |
71cdb697 | 2927 | |
956a4025 | 2928 | r = dm_grab_bdev_for_ioctl(md, &bdev, &mode); |
71cdb697 CH |
2929 | if (r < 0) |
2930 | return r; | |
2931 | ||
2932 | ops = bdev->bd_disk->fops->pr_ops; | |
2933 | if (ops && ops->pr_release) | |
2934 | r = ops->pr_release(bdev, key, type); | |
2935 | else | |
2936 | r = -EOPNOTSUPP; | |
2937 | ||
956a4025 | 2938 | bdput(bdev); |
71cdb697 CH |
2939 | return r; |
2940 | } | |
2941 | ||
2942 | static int dm_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key, | |
956a4025 | 2943 | enum pr_type type, bool abort) |
71cdb697 CH |
2944 | { |
2945 | struct mapped_device *md = bdev->bd_disk->private_data; | |
2946 | const struct pr_ops *ops; | |
71cdb697 | 2947 | fmode_t mode; |
956a4025 | 2948 | int r; |
71cdb697 | 2949 | |
956a4025 | 2950 | r = dm_grab_bdev_for_ioctl(md, &bdev, &mode); |
71cdb697 CH |
2951 | if (r < 0) |
2952 | return r; | |
2953 | ||
2954 | ops = bdev->bd_disk->fops->pr_ops; | |
2955 | if (ops && ops->pr_preempt) | |
2956 | r = ops->pr_preempt(bdev, old_key, new_key, type, abort); | |
2957 | else | |
2958 | r = -EOPNOTSUPP; | |
2959 | ||
956a4025 | 2960 | bdput(bdev); |
71cdb697 CH |
2961 | return r; |
2962 | } | |
2963 | ||
2964 | static int dm_pr_clear(struct block_device *bdev, u64 key) | |
2965 | { | |
2966 | struct mapped_device *md = bdev->bd_disk->private_data; | |
2967 | const struct pr_ops *ops; | |
71cdb697 | 2968 | fmode_t mode; |
956a4025 | 2969 | int r; |
71cdb697 | 2970 | |
956a4025 | 2971 | r = dm_grab_bdev_for_ioctl(md, &bdev, &mode); |
71cdb697 CH |
2972 | if (r < 0) |
2973 | return r; | |
2974 | ||
2975 | ops = bdev->bd_disk->fops->pr_ops; | |
2976 | if (ops && ops->pr_clear) | |
2977 | r = ops->pr_clear(bdev, key); | |
2978 | else | |
2979 | r = -EOPNOTSUPP; | |
2980 | ||
956a4025 | 2981 | bdput(bdev); |
71cdb697 CH |
2982 | return r; |
2983 | } | |
2984 | ||
2985 | static const struct pr_ops dm_pr_ops = { | |
2986 | .pr_register = dm_pr_register, | |
2987 | .pr_reserve = dm_pr_reserve, | |
2988 | .pr_release = dm_pr_release, | |
2989 | .pr_preempt = dm_pr_preempt, | |
2990 | .pr_clear = dm_pr_clear, | |
2991 | }; | |
2992 | ||
83d5cde4 | 2993 | static const struct block_device_operations dm_blk_dops = { |
1da177e4 LT |
2994 | .open = dm_blk_open, |
2995 | .release = dm_blk_close, | |
aa129a22 | 2996 | .ioctl = dm_blk_ioctl, |
3ac51e74 | 2997 | .getgeo = dm_blk_getgeo, |
71cdb697 | 2998 | .pr_ops = &dm_pr_ops, |
1da177e4 LT |
2999 | .owner = THIS_MODULE |
3000 | }; | |
3001 | ||
f26c5719 DW |
3002 | static const struct dax_operations dm_dax_ops = { |
3003 | .direct_access = dm_dax_direct_access, | |
7e026c8c | 3004 | .copy_from_iter = dm_dax_copy_from_iter, |
abebfbe2 | 3005 | .flush = dm_dax_flush, |
f26c5719 DW |
3006 | }; |
3007 | ||
1da177e4 LT |
3008 | /* |
3009 | * module hooks | |
3010 | */ | |
3011 | module_init(dm_init); | |
3012 | module_exit(dm_exit); | |
3013 | ||
3014 | module_param(major, uint, 0); | |
3015 | MODULE_PARM_DESC(major, "The major number of the device mapper"); | |
f4790826 | 3016 | |
e8603136 MS |
3017 | module_param(reserved_bio_based_ios, uint, S_IRUGO | S_IWUSR); |
3018 | MODULE_PARM_DESC(reserved_bio_based_ios, "Reserved IOs in bio-based mempools"); | |
3019 | ||
115485e8 MS |
3020 | module_param(dm_numa_node, int, S_IRUGO | S_IWUSR); |
3021 | MODULE_PARM_DESC(dm_numa_node, "NUMA node for DM device memory allocations"); | |
3022 | ||
1da177e4 LT |
3023 | MODULE_DESCRIPTION(DM_NAME " driver"); |
3024 | MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>"); | |
3025 | MODULE_LICENSE("GPL"); |