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7
8#include "dm-core.h"
9
10#include <linux/module.h>
11#include <linux/vmalloc.h>
12#include <linux/blkdev.h>
13#include <linux/namei.h>
14#include <linux/ctype.h>
15#include <linux/string.h>
16#include <linux/slab.h>
17#include <linux/interrupt.h>
18#include <linux/mutex.h>
19#include <linux/delay.h>
20#include <linux/atomic.h>
21#include <linux/blk-mq.h>
22#include <linux/mount.h>
23#include <linux/dax.h>
24
25#define DM_MSG_PREFIX "table"
26
27#define MAX_DEPTH 16
28#define NODE_SIZE L1_CACHE_BYTES
29#define KEYS_PER_NODE (NODE_SIZE / sizeof(sector_t))
30#define CHILDREN_PER_NODE (KEYS_PER_NODE + 1)
31
32struct dm_table {
33 struct mapped_device *md;
34 enum dm_queue_mode type;
35
36
37 unsigned int depth;
38 unsigned int counts[MAX_DEPTH];
39 sector_t *index[MAX_DEPTH];
40
41 unsigned int num_targets;
42 unsigned int num_allocated;
43 sector_t *highs;
44 struct dm_target *targets;
45
46 struct target_type *immutable_target_type;
47
48 bool integrity_supported:1;
49 bool singleton:1;
50 unsigned integrity_added:1;
51
52
53
54
55
56
57 fmode_t mode;
58
59
60 struct list_head devices;
61
62
63 void (*event_fn)(void *);
64 void *event_context;
65
66 struct dm_md_mempools *mempools;
67
68 struct list_head target_callbacks;
69};
70
71
72
73
74static unsigned int int_log(unsigned int n, unsigned int base)
75{
76 int result = 0;
77
78 while (n > 1) {
79 n = dm_div_up(n, base);
80 result++;
81 }
82
83 return result;
84}
85
86
87
88
89static inline unsigned int get_child(unsigned int n, unsigned int k)
90{
91 return (n * CHILDREN_PER_NODE) + k;
92}
93
94
95
96
97static inline sector_t *get_node(struct dm_table *t,
98 unsigned int l, unsigned int n)
99{
100 return t->index[l] + (n * KEYS_PER_NODE);
101}
102
103
104
105
106
107static sector_t high(struct dm_table *t, unsigned int l, unsigned int n)
108{
109 for (; l < t->depth - 1; l++)
110 n = get_child(n, CHILDREN_PER_NODE - 1);
111
112 if (n >= t->counts[l])
113 return (sector_t) - 1;
114
115 return get_node(t, l, n)[KEYS_PER_NODE - 1];
116}
117
118
119
120
121
122static int setup_btree_index(unsigned int l, struct dm_table *t)
123{
124 unsigned int n, k;
125 sector_t *node;
126
127 for (n = 0U; n < t->counts[l]; n++) {
128 node = get_node(t, l, n);
129
130 for (k = 0U; k < KEYS_PER_NODE; k++)
131 node[k] = high(t, l + 1, get_child(n, k));
132 }
133
134 return 0;
135}
136
137void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size)
138{
139 unsigned long size;
140 void *addr;
141
142
143
144
145 if (nmemb > (ULONG_MAX / elem_size))
146 return NULL;
147
148 size = nmemb * elem_size;
149 addr = vzalloc(size);
150
151 return addr;
152}
153EXPORT_SYMBOL(dm_vcalloc);
154
155
156
157
158
159static int alloc_targets(struct dm_table *t, unsigned int num)
160{
161 sector_t *n_highs;
162 struct dm_target *n_targets;
163
164
165
166
167
168
169 n_highs = (sector_t *) dm_vcalloc(num + 1, sizeof(struct dm_target) +
170 sizeof(sector_t));
171 if (!n_highs)
172 return -ENOMEM;
173
174 n_targets = (struct dm_target *) (n_highs + num);
175
176 memset(n_highs, -1, sizeof(*n_highs) * num);
177 vfree(t->highs);
178
179 t->num_allocated = num;
180 t->highs = n_highs;
181 t->targets = n_targets;
182
183 return 0;
184}
185
186int dm_table_create(struct dm_table **result, fmode_t mode,
187 unsigned num_targets, struct mapped_device *md)
188{
189 struct dm_table *t = kzalloc(sizeof(*t), GFP_KERNEL);
190
191 if (!t)
192 return -ENOMEM;
193
194 INIT_LIST_HEAD(&t->devices);
195 INIT_LIST_HEAD(&t->target_callbacks);
196
197 if (!num_targets)
198 num_targets = KEYS_PER_NODE;
199
200 num_targets = dm_round_up(num_targets, KEYS_PER_NODE);
201
202 if (!num_targets) {
203 kfree(t);
204 return -ENOMEM;
205 }
206
207 if (alloc_targets(t, num_targets)) {
208 kfree(t);
209 return -ENOMEM;
210 }
211
212 t->type = DM_TYPE_NONE;
213 t->mode = mode;
214 t->md = md;
215 *result = t;
216 return 0;
217}
218
219static void free_devices(struct list_head *devices, struct mapped_device *md)
220{
221 struct list_head *tmp, *next;
222
223 list_for_each_safe(tmp, next, devices) {
224 struct dm_dev_internal *dd =
225 list_entry(tmp, struct dm_dev_internal, list);
226 DMWARN("%s: dm_table_destroy: dm_put_device call missing for %s",
227 dm_device_name(md), dd->dm_dev->name);
228 dm_put_table_device(md, dd->dm_dev);
229 kfree(dd);
230 }
231}
232
233void dm_table_destroy(struct dm_table *t)
234{
235 unsigned int i;
236
237 if (!t)
238 return;
239
240
241 if (t->depth >= 2)
242 vfree(t->index[t->depth - 2]);
243
244
245 for (i = 0; i < t->num_targets; i++) {
246 struct dm_target *tgt = t->targets + i;
247
248 if (tgt->type->dtr)
249 tgt->type->dtr(tgt);
250
251 dm_put_target_type(tgt->type);
252 }
253
254 vfree(t->highs);
255
256
257 free_devices(&t->devices, t->md);
258
259 dm_free_md_mempools(t->mempools);
260
261 kfree(t);
262}
263
264
265
266
267static struct dm_dev_internal *find_device(struct list_head *l, dev_t dev)
268{
269 struct dm_dev_internal *dd;
270
271 list_for_each_entry (dd, l, list)
272 if (dd->dm_dev->bdev->bd_dev == dev)
273 return dd;
274
275 return NULL;
276}
277
278
279
280
281static int device_area_is_invalid(struct dm_target *ti, struct dm_dev *dev,
282 sector_t start, sector_t len, void *data)
283{
284 struct request_queue *q;
285 struct queue_limits *limits = data;
286 struct block_device *bdev = dev->bdev;
287 sector_t dev_size =
288 i_size_read(bdev->bd_inode) >> SECTOR_SHIFT;
289 unsigned short logical_block_size_sectors =
290 limits->logical_block_size >> SECTOR_SHIFT;
291 char b[BDEVNAME_SIZE];
292
293
294
295
296
297
298 q = bdev_get_queue(bdev);
299 if (!q || !q->make_request_fn) {
300 DMWARN("%s: %s is not yet initialised: "
301 "start=%llu, len=%llu, dev_size=%llu",
302 dm_device_name(ti->table->md), bdevname(bdev, b),
303 (unsigned long long)start,
304 (unsigned long long)len,
305 (unsigned long long)dev_size);
306 return 1;
307 }
308
309 if (!dev_size)
310 return 0;
311
312 if ((start >= dev_size) || (start + len > dev_size)) {
313 DMWARN("%s: %s too small for target: "
314 "start=%llu, len=%llu, dev_size=%llu",
315 dm_device_name(ti->table->md), bdevname(bdev, b),
316 (unsigned long long)start,
317 (unsigned long long)len,
318 (unsigned long long)dev_size);
319 return 1;
320 }
321
322
323
324
325
326 if (bdev_zoned_model(bdev) != BLK_ZONED_NONE) {
327 unsigned int zone_sectors = bdev_zone_sectors(bdev);
328
329 if (start & (zone_sectors - 1)) {
330 DMWARN("%s: start=%llu not aligned to h/w zone size %u of %s",
331 dm_device_name(ti->table->md),
332 (unsigned long long)start,
333 zone_sectors, bdevname(bdev, b));
334 return 1;
335 }
336
337
338
339
340
341
342
343
344
345
346 if (len & (zone_sectors - 1)) {
347 DMWARN("%s: len=%llu not aligned to h/w zone size %u of %s",
348 dm_device_name(ti->table->md),
349 (unsigned long long)len,
350 zone_sectors, bdevname(bdev, b));
351 return 1;
352 }
353 }
354
355 if (logical_block_size_sectors <= 1)
356 return 0;
357
358 if (start & (logical_block_size_sectors - 1)) {
359 DMWARN("%s: start=%llu not aligned to h/w "
360 "logical block size %u of %s",
361 dm_device_name(ti->table->md),
362 (unsigned long long)start,
363 limits->logical_block_size, bdevname(bdev, b));
364 return 1;
365 }
366
367 if (len & (logical_block_size_sectors - 1)) {
368 DMWARN("%s: len=%llu not aligned to h/w "
369 "logical block size %u of %s",
370 dm_device_name(ti->table->md),
371 (unsigned long long)len,
372 limits->logical_block_size, bdevname(bdev, b));
373 return 1;
374 }
375
376 return 0;
377}
378
379
380
381
382
383
384
385static int upgrade_mode(struct dm_dev_internal *dd, fmode_t new_mode,
386 struct mapped_device *md)
387{
388 int r;
389 struct dm_dev *old_dev, *new_dev;
390
391 old_dev = dd->dm_dev;
392
393 r = dm_get_table_device(md, dd->dm_dev->bdev->bd_dev,
394 dd->dm_dev->mode | new_mode, &new_dev);
395 if (r)
396 return r;
397
398 dd->dm_dev = new_dev;
399 dm_put_table_device(md, old_dev);
400
401 return 0;
402}
403
404
405
406
407dev_t dm_get_dev_t(const char *path)
408{
409 dev_t dev;
410 struct block_device *bdev;
411
412 bdev = lookup_bdev(path);
413 if (IS_ERR(bdev))
414 dev = name_to_dev_t(path);
415 else {
416 dev = bdev->bd_dev;
417 bdput(bdev);
418 }
419
420 return dev;
421}
422EXPORT_SYMBOL_GPL(dm_get_dev_t);
423
424
425
426
427
428int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode,
429 struct dm_dev **result)
430{
431 int r;
432 dev_t dev;
433 struct dm_dev_internal *dd;
434 struct dm_table *t = ti->table;
435
436 BUG_ON(!t);
437
438 dev = dm_get_dev_t(path);
439 if (!dev)
440 return -ENODEV;
441
442 dd = find_device(&t->devices, dev);
443 if (!dd) {
444 dd = kmalloc(sizeof(*dd), GFP_KERNEL);
445 if (!dd)
446 return -ENOMEM;
447
448 if ((r = dm_get_table_device(t->md, dev, mode, &dd->dm_dev))) {
449 kfree(dd);
450 return r;
451 }
452
453 refcount_set(&dd->count, 1);
454 list_add(&dd->list, &t->devices);
455 goto out;
456
457 } else if (dd->dm_dev->mode != (mode | dd->dm_dev->mode)) {
458 r = upgrade_mode(dd, mode, t->md);
459 if (r)
460 return r;
461 }
462 refcount_inc(&dd->count);
463out:
464 *result = dd->dm_dev;
465 return 0;
466}
467EXPORT_SYMBOL(dm_get_device);
468
469static int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev,
470 sector_t start, sector_t len, void *data)
471{
472 struct queue_limits *limits = data;
473 struct block_device *bdev = dev->bdev;
474 struct request_queue *q = bdev_get_queue(bdev);
475 char b[BDEVNAME_SIZE];
476
477 if (unlikely(!q)) {
478 DMWARN("%s: Cannot set limits for nonexistent device %s",
479 dm_device_name(ti->table->md), bdevname(bdev, b));
480 return 0;
481 }
482
483 if (bdev_stack_limits(limits, bdev, start) < 0)
484 DMWARN("%s: adding target device %s caused an alignment inconsistency: "
485 "physical_block_size=%u, logical_block_size=%u, "
486 "alignment_offset=%u, start=%llu",
487 dm_device_name(ti->table->md), bdevname(bdev, b),
488 q->limits.physical_block_size,
489 q->limits.logical_block_size,
490 q->limits.alignment_offset,
491 (unsigned long long) start << SECTOR_SHIFT);
492
493 limits->zoned = blk_queue_zoned_model(q);
494
495 return 0;
496}
497
498
499
500
501void dm_put_device(struct dm_target *ti, struct dm_dev *d)
502{
503 int found = 0;
504 struct list_head *devices = &ti->table->devices;
505 struct dm_dev_internal *dd;
506
507 list_for_each_entry(dd, devices, list) {
508 if (dd->dm_dev == d) {
509 found = 1;
510 break;
511 }
512 }
513 if (!found) {
514 DMWARN("%s: device %s not in table devices list",
515 dm_device_name(ti->table->md), d->name);
516 return;
517 }
518 if (refcount_dec_and_test(&dd->count)) {
519 dm_put_table_device(ti->table->md, d);
520 list_del(&dd->list);
521 kfree(dd);
522 }
523}
524EXPORT_SYMBOL(dm_put_device);
525
526
527
528
529static int adjoin(struct dm_table *table, struct dm_target *ti)
530{
531 struct dm_target *prev;
532
533 if (!table->num_targets)
534 return !ti->begin;
535
536 prev = &table->targets[table->num_targets - 1];
537 return (ti->begin == (prev->begin + prev->len));
538}
539
540
541
542
543
544
545
546
547
548
549
550static char **realloc_argv(unsigned *size, char **old_argv)
551{
552 char **argv;
553 unsigned new_size;
554 gfp_t gfp;
555
556 if (*size) {
557 new_size = *size * 2;
558 gfp = GFP_KERNEL;
559 } else {
560 new_size = 8;
561 gfp = GFP_NOIO;
562 }
563 argv = kmalloc_array(new_size, sizeof(*argv), gfp);
564 if (argv && old_argv) {
565 memcpy(argv, old_argv, *size * sizeof(*argv));
566 *size = new_size;
567 }
568
569 kfree(old_argv);
570 return argv;
571}
572
573
574
575
576int dm_split_args(int *argc, char ***argvp, char *input)
577{
578 char *start, *end = input, *out, **argv = NULL;
579 unsigned array_size = 0;
580
581 *argc = 0;
582
583 if (!input) {
584 *argvp = NULL;
585 return 0;
586 }
587
588 argv = realloc_argv(&array_size, argv);
589 if (!argv)
590 return -ENOMEM;
591
592 while (1) {
593
594 start = skip_spaces(end);
595
596 if (!*start)
597 break;
598
599
600 end = out = start;
601 while (*end) {
602
603 if (*end == '\\' && *(end + 1)) {
604 *out++ = *(end + 1);
605 end += 2;
606 continue;
607 }
608
609 if (isspace(*end))
610 break;
611
612 *out++ = *end++;
613 }
614
615
616 if ((*argc + 1) > array_size) {
617 argv = realloc_argv(&array_size, argv);
618 if (!argv)
619 return -ENOMEM;
620 }
621
622
623 if (*end)
624 end++;
625
626
627 *out = '\0';
628 argv[*argc] = start;
629 (*argc)++;
630 }
631
632 *argvp = argv;
633 return 0;
634}
635
636
637
638
639
640
641
642
643static int validate_hardware_logical_block_alignment(struct dm_table *table,
644 struct queue_limits *limits)
645{
646
647
648
649
650 unsigned short device_logical_block_size_sects =
651 limits->logical_block_size >> SECTOR_SHIFT;
652
653
654
655
656 unsigned short next_target_start = 0;
657
658
659
660
661
662 unsigned short remaining = 0;
663
664 struct dm_target *uninitialized_var(ti);
665 struct queue_limits ti_limits;
666 unsigned i;
667
668
669
670
671 for (i = 0; i < dm_table_get_num_targets(table); i++) {
672 ti = dm_table_get_target(table, i);
673
674 blk_set_stacking_limits(&ti_limits);
675
676
677 if (ti->type->iterate_devices)
678 ti->type->iterate_devices(ti, dm_set_device_limits,
679 &ti_limits);
680
681
682
683
684
685 if (remaining < ti->len &&
686 remaining & ((ti_limits.logical_block_size >>
687 SECTOR_SHIFT) - 1))
688 break;
689
690 next_target_start =
691 (unsigned short) ((next_target_start + ti->len) &
692 (device_logical_block_size_sects - 1));
693 remaining = next_target_start ?
694 device_logical_block_size_sects - next_target_start : 0;
695 }
696
697 if (remaining) {
698 DMWARN("%s: table line %u (start sect %llu len %llu) "
699 "not aligned to h/w logical block size %u",
700 dm_device_name(table->md), i,
701 (unsigned long long) ti->begin,
702 (unsigned long long) ti->len,
703 limits->logical_block_size);
704 return -EINVAL;
705 }
706
707 return 0;
708}
709
710int dm_table_add_target(struct dm_table *t, const char *type,
711 sector_t start, sector_t len, char *params)
712{
713 int r = -EINVAL, argc;
714 char **argv;
715 struct dm_target *tgt;
716
717 if (t->singleton) {
718 DMERR("%s: target type %s must appear alone in table",
719 dm_device_name(t->md), t->targets->type->name);
720 return -EINVAL;
721 }
722
723 BUG_ON(t->num_targets >= t->num_allocated);
724
725 tgt = t->targets + t->num_targets;
726 memset(tgt, 0, sizeof(*tgt));
727
728 if (!len) {
729 DMERR("%s: zero-length target", dm_device_name(t->md));
730 return -EINVAL;
731 }
732
733 tgt->type = dm_get_target_type(type);
734 if (!tgt->type) {
735 DMERR("%s: %s: unknown target type", dm_device_name(t->md), type);
736 return -EINVAL;
737 }
738
739 if (dm_target_needs_singleton(tgt->type)) {
740 if (t->num_targets) {
741 tgt->error = "singleton target type must appear alone in table";
742 goto bad;
743 }
744 t->singleton = true;
745 }
746
747 if (dm_target_always_writeable(tgt->type) && !(t->mode & FMODE_WRITE)) {
748 tgt->error = "target type may not be included in a read-only table";
749 goto bad;
750 }
751
752 if (t->immutable_target_type) {
753 if (t->immutable_target_type != tgt->type) {
754 tgt->error = "immutable target type cannot be mixed with other target types";
755 goto bad;
756 }
757 } else if (dm_target_is_immutable(tgt->type)) {
758 if (t->num_targets) {
759 tgt->error = "immutable target type cannot be mixed with other target types";
760 goto bad;
761 }
762 t->immutable_target_type = tgt->type;
763 }
764
765 if (dm_target_has_integrity(tgt->type))
766 t->integrity_added = 1;
767
768 tgt->table = t;
769 tgt->begin = start;
770 tgt->len = len;
771 tgt->error = "Unknown error";
772
773
774
775
776 if (!adjoin(t, tgt)) {
777 tgt->error = "Gap in table";
778 goto bad;
779 }
780
781 r = dm_split_args(&argc, &argv, params);
782 if (r) {
783 tgt->error = "couldn't split parameters (insufficient memory)";
784 goto bad;
785 }
786
787 r = tgt->type->ctr(tgt, argc, argv);
788 kfree(argv);
789 if (r)
790 goto bad;
791
792 t->highs[t->num_targets++] = tgt->begin + tgt->len - 1;
793
794 if (!tgt->num_discard_bios && tgt->discards_supported)
795 DMWARN("%s: %s: ignoring discards_supported because num_discard_bios is zero.",
796 dm_device_name(t->md), type);
797
798 return 0;
799
800 bad:
801 DMERR("%s: %s: %s", dm_device_name(t->md), type, tgt->error);
802 dm_put_target_type(tgt->type);
803 return r;
804}
805
806
807
808
809static int validate_next_arg(const struct dm_arg *arg,
810 struct dm_arg_set *arg_set,
811 unsigned *value, char **error, unsigned grouped)
812{
813 const char *arg_str = dm_shift_arg(arg_set);
814 char dummy;
815
816 if (!arg_str ||
817 (sscanf(arg_str, "%u%c", value, &dummy) != 1) ||
818 (*value < arg->min) ||
819 (*value > arg->max) ||
820 (grouped && arg_set->argc < *value)) {
821 *error = arg->error;
822 return -EINVAL;
823 }
824
825 return 0;
826}
827
828int dm_read_arg(const struct dm_arg *arg, struct dm_arg_set *arg_set,
829 unsigned *value, char **error)
830{
831 return validate_next_arg(arg, arg_set, value, error, 0);
832}
833EXPORT_SYMBOL(dm_read_arg);
834
835int dm_read_arg_group(const struct dm_arg *arg, struct dm_arg_set *arg_set,
836 unsigned *value, char **error)
837{
838 return validate_next_arg(arg, arg_set, value, error, 1);
839}
840EXPORT_SYMBOL(dm_read_arg_group);
841
842const char *dm_shift_arg(struct dm_arg_set *as)
843{
844 char *r;
845
846 if (as->argc) {
847 as->argc--;
848 r = *as->argv;
849 as->argv++;
850 return r;
851 }
852
853 return NULL;
854}
855EXPORT_SYMBOL(dm_shift_arg);
856
857void dm_consume_args(struct dm_arg_set *as, unsigned num_args)
858{
859 BUG_ON(as->argc < num_args);
860 as->argc -= num_args;
861 as->argv += num_args;
862}
863EXPORT_SYMBOL(dm_consume_args);
864
865static bool __table_type_bio_based(enum dm_queue_mode table_type)
866{
867 return (table_type == DM_TYPE_BIO_BASED ||
868 table_type == DM_TYPE_DAX_BIO_BASED ||
869 table_type == DM_TYPE_NVME_BIO_BASED);
870}
871
872static bool __table_type_request_based(enum dm_queue_mode table_type)
873{
874 return table_type == DM_TYPE_REQUEST_BASED;
875}
876
877void dm_table_set_type(struct dm_table *t, enum dm_queue_mode type)
878{
879 t->type = type;
880}
881EXPORT_SYMBOL_GPL(dm_table_set_type);
882
883
884int device_supports_dax(struct dm_target *ti, struct dm_dev *dev,
885 sector_t start, sector_t len, void *data)
886{
887 int blocksize = *(int *) data;
888
889 return generic_fsdax_supported(dev->dax_dev, dev->bdev, blocksize,
890 start, len);
891}
892
893
894static int device_dax_synchronous(struct dm_target *ti, struct dm_dev *dev,
895 sector_t start, sector_t len, void *data)
896{
897 return dev->dax_dev && dax_synchronous(dev->dax_dev);
898}
899
900bool dm_table_supports_dax(struct dm_table *t,
901 iterate_devices_callout_fn iterate_fn, int *blocksize)
902{
903 struct dm_target *ti;
904 unsigned i;
905
906
907 for (i = 0; i < dm_table_get_num_targets(t); i++) {
908 ti = dm_table_get_target(t, i);
909
910 if (!ti->type->direct_access)
911 return false;
912
913 if (!ti->type->iterate_devices ||
914 !ti->type->iterate_devices(ti, iterate_fn, blocksize))
915 return false;
916 }
917
918 return true;
919}
920
921static bool dm_table_does_not_support_partial_completion(struct dm_table *t);
922
923struct verify_rq_based_data {
924 unsigned sq_count;
925 unsigned mq_count;
926};
927
928static int device_is_rq_based(struct dm_target *ti, struct dm_dev *dev,
929 sector_t start, sector_t len, void *data)
930{
931 struct request_queue *q = bdev_get_queue(dev->bdev);
932 struct verify_rq_based_data *v = data;
933
934 if (queue_is_mq(q))
935 v->mq_count++;
936 else
937 v->sq_count++;
938
939 return queue_is_mq(q);
940}
941
942static int dm_table_determine_type(struct dm_table *t)
943{
944 unsigned i;
945 unsigned bio_based = 0, request_based = 0, hybrid = 0;
946 struct verify_rq_based_data v = {.sq_count = 0, .mq_count = 0};
947 struct dm_target *tgt;
948 struct list_head *devices = dm_table_get_devices(t);
949 enum dm_queue_mode live_md_type = dm_get_md_type(t->md);
950 int page_size = PAGE_SIZE;
951
952 if (t->type != DM_TYPE_NONE) {
953
954 if (t->type == DM_TYPE_BIO_BASED) {
955
956 goto verify_bio_based;
957 }
958 BUG_ON(t->type == DM_TYPE_DAX_BIO_BASED);
959 BUG_ON(t->type == DM_TYPE_NVME_BIO_BASED);
960 goto verify_rq_based;
961 }
962
963 for (i = 0; i < t->num_targets; i++) {
964 tgt = t->targets + i;
965 if (dm_target_hybrid(tgt))
966 hybrid = 1;
967 else if (dm_target_request_based(tgt))
968 request_based = 1;
969 else
970 bio_based = 1;
971
972 if (bio_based && request_based) {
973 DMERR("Inconsistent table: different target types"
974 " can't be mixed up");
975 return -EINVAL;
976 }
977 }
978
979 if (hybrid && !bio_based && !request_based) {
980
981
982
983
984
985 if (__table_type_request_based(live_md_type))
986 request_based = 1;
987 else
988 bio_based = 1;
989 }
990
991 if (bio_based) {
992verify_bio_based:
993
994 t->type = DM_TYPE_BIO_BASED;
995 if (dm_table_supports_dax(t, device_supports_dax, &page_size) ||
996 (list_empty(devices) && live_md_type == DM_TYPE_DAX_BIO_BASED)) {
997 t->type = DM_TYPE_DAX_BIO_BASED;
998 } else {
999
1000 tgt = dm_table_get_immutable_target(t);
1001 if (tgt && !tgt->max_io_len && dm_table_does_not_support_partial_completion(t)) {
1002 t->type = DM_TYPE_NVME_BIO_BASED;
1003 goto verify_rq_based;
1004 } else if (list_empty(devices) && live_md_type == DM_TYPE_NVME_BIO_BASED) {
1005 t->type = DM_TYPE_NVME_BIO_BASED;
1006 }
1007 }
1008 return 0;
1009 }
1010
1011 BUG_ON(!request_based);
1012
1013 t->type = DM_TYPE_REQUEST_BASED;
1014
1015verify_rq_based:
1016
1017
1018
1019
1020
1021
1022 if (t->num_targets > 1) {
1023 DMERR("%s DM doesn't support multiple targets",
1024 t->type == DM_TYPE_NVME_BIO_BASED ? "nvme bio-based" : "request-based");
1025 return -EINVAL;
1026 }
1027
1028 if (list_empty(devices)) {
1029 int srcu_idx;
1030 struct dm_table *live_table = dm_get_live_table(t->md, &srcu_idx);
1031
1032
1033 if (live_table)
1034 t->type = live_table->type;
1035 dm_put_live_table(t->md, srcu_idx);
1036 return 0;
1037 }
1038
1039 tgt = dm_table_get_immutable_target(t);
1040 if (!tgt) {
1041 DMERR("table load rejected: immutable target is required");
1042 return -EINVAL;
1043 } else if (tgt->max_io_len) {
1044 DMERR("table load rejected: immutable target that splits IO is not supported");
1045 return -EINVAL;
1046 }
1047
1048
1049 if (!tgt->type->iterate_devices ||
1050 !tgt->type->iterate_devices(tgt, device_is_rq_based, &v)) {
1051 DMERR("table load rejected: including non-request-stackable devices");
1052 return -EINVAL;
1053 }
1054 if (v.sq_count > 0) {
1055 DMERR("table load rejected: not all devices are blk-mq request-stackable");
1056 return -EINVAL;
1057 }
1058
1059 return 0;
1060}
1061
1062enum dm_queue_mode dm_table_get_type(struct dm_table *t)
1063{
1064 return t->type;
1065}
1066
1067struct target_type *dm_table_get_immutable_target_type(struct dm_table *t)
1068{
1069 return t->immutable_target_type;
1070}
1071
1072struct dm_target *dm_table_get_immutable_target(struct dm_table *t)
1073{
1074
1075 if (t->num_targets > 1 ||
1076 !dm_target_is_immutable(t->targets[0].type))
1077 return NULL;
1078
1079 return t->targets;
1080}
1081
1082struct dm_target *dm_table_get_wildcard_target(struct dm_table *t)
1083{
1084 struct dm_target *ti;
1085 unsigned i;
1086
1087 for (i = 0; i < dm_table_get_num_targets(t); i++) {
1088 ti = dm_table_get_target(t, i);
1089 if (dm_target_is_wildcard(ti->type))
1090 return ti;
1091 }
1092
1093 return NULL;
1094}
1095
1096bool dm_table_bio_based(struct dm_table *t)
1097{
1098 return __table_type_bio_based(dm_table_get_type(t));
1099}
1100
1101bool dm_table_request_based(struct dm_table *t)
1102{
1103 return __table_type_request_based(dm_table_get_type(t));
1104}
1105
1106static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *md)
1107{
1108 enum dm_queue_mode type = dm_table_get_type(t);
1109 unsigned per_io_data_size = 0;
1110 unsigned min_pool_size = 0;
1111 struct dm_target *ti;
1112 unsigned i;
1113
1114 if (unlikely(type == DM_TYPE_NONE)) {
1115 DMWARN("no table type is set, can't allocate mempools");
1116 return -EINVAL;
1117 }
1118
1119 if (__table_type_bio_based(type))
1120 for (i = 0; i < t->num_targets; i++) {
1121 ti = t->targets + i;
1122 per_io_data_size = max(per_io_data_size, ti->per_io_data_size);
1123 min_pool_size = max(min_pool_size, ti->num_flush_bios);
1124 }
1125
1126 t->mempools = dm_alloc_md_mempools(md, type, t->integrity_supported,
1127 per_io_data_size, min_pool_size);
1128 if (!t->mempools)
1129 return -ENOMEM;
1130
1131 return 0;
1132}
1133
1134void dm_table_free_md_mempools(struct dm_table *t)
1135{
1136 dm_free_md_mempools(t->mempools);
1137 t->mempools = NULL;
1138}
1139
1140struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t)
1141{
1142 return t->mempools;
1143}
1144
1145static int setup_indexes(struct dm_table *t)
1146{
1147 int i;
1148 unsigned int total = 0;
1149 sector_t *indexes;
1150
1151
1152 for (i = t->depth - 2; i >= 0; i--) {
1153 t->counts[i] = dm_div_up(t->counts[i + 1], CHILDREN_PER_NODE);
1154 total += t->counts[i];
1155 }
1156
1157 indexes = (sector_t *) dm_vcalloc(total, (unsigned long) NODE_SIZE);
1158 if (!indexes)
1159 return -ENOMEM;
1160
1161
1162 for (i = t->depth - 2; i >= 0; i--) {
1163 t->index[i] = indexes;
1164 indexes += (KEYS_PER_NODE * t->counts[i]);
1165 setup_btree_index(i, t);
1166 }
1167
1168 return 0;
1169}
1170
1171
1172
1173
1174static int dm_table_build_index(struct dm_table *t)
1175{
1176 int r = 0;
1177 unsigned int leaf_nodes;
1178
1179
1180 leaf_nodes = dm_div_up(t->num_targets, KEYS_PER_NODE);
1181 t->depth = 1 + int_log(leaf_nodes, CHILDREN_PER_NODE);
1182
1183
1184 t->counts[t->depth - 1] = leaf_nodes;
1185 t->index[t->depth - 1] = t->highs;
1186
1187 if (t->depth >= 2)
1188 r = setup_indexes(t);
1189
1190 return r;
1191}
1192
1193static bool integrity_profile_exists(struct gendisk *disk)
1194{
1195 return !!blk_get_integrity(disk);
1196}
1197
1198
1199
1200
1201
1202static struct gendisk * dm_table_get_integrity_disk(struct dm_table *t)
1203{
1204 struct list_head *devices = dm_table_get_devices(t);
1205 struct dm_dev_internal *dd = NULL;
1206 struct gendisk *prev_disk = NULL, *template_disk = NULL;
1207 unsigned i;
1208
1209 for (i = 0; i < dm_table_get_num_targets(t); i++) {
1210 struct dm_target *ti = dm_table_get_target(t, i);
1211 if (!dm_target_passes_integrity(ti->type))
1212 goto no_integrity;
1213 }
1214
1215 list_for_each_entry(dd, devices, list) {
1216 template_disk = dd->dm_dev->bdev->bd_disk;
1217 if (!integrity_profile_exists(template_disk))
1218 goto no_integrity;
1219 else if (prev_disk &&
1220 blk_integrity_compare(prev_disk, template_disk) < 0)
1221 goto no_integrity;
1222 prev_disk = template_disk;
1223 }
1224
1225 return template_disk;
1226
1227no_integrity:
1228 if (prev_disk)
1229 DMWARN("%s: integrity not set: %s and %s profile mismatch",
1230 dm_device_name(t->md),
1231 prev_disk->disk_name,
1232 template_disk->disk_name);
1233 return NULL;
1234}
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246static int dm_table_register_integrity(struct dm_table *t)
1247{
1248 struct mapped_device *md = t->md;
1249 struct gendisk *template_disk = NULL;
1250
1251
1252 if (t->integrity_added)
1253 return 0;
1254
1255 template_disk = dm_table_get_integrity_disk(t);
1256 if (!template_disk)
1257 return 0;
1258
1259 if (!integrity_profile_exists(dm_disk(md))) {
1260 t->integrity_supported = true;
1261
1262
1263
1264
1265 blk_integrity_register(dm_disk(md),
1266 blk_get_integrity(template_disk));
1267 return 0;
1268 }
1269
1270
1271
1272
1273
1274 if (blk_integrity_compare(dm_disk(md), template_disk) < 0) {
1275 DMWARN("%s: conflict with existing integrity profile: "
1276 "%s profile mismatch",
1277 dm_device_name(t->md),
1278 template_disk->disk_name);
1279 return 1;
1280 }
1281
1282
1283 t->integrity_supported = true;
1284 return 0;
1285}
1286
1287
1288
1289
1290
1291int dm_table_complete(struct dm_table *t)
1292{
1293 int r;
1294
1295 r = dm_table_determine_type(t);
1296 if (r) {
1297 DMERR("unable to determine table type");
1298 return r;
1299 }
1300
1301 r = dm_table_build_index(t);
1302 if (r) {
1303 DMERR("unable to build btrees");
1304 return r;
1305 }
1306
1307 r = dm_table_register_integrity(t);
1308 if (r) {
1309 DMERR("could not register integrity profile.");
1310 return r;
1311 }
1312
1313 r = dm_table_alloc_md_mempools(t, t->md);
1314 if (r)
1315 DMERR("unable to allocate mempools");
1316
1317 return r;
1318}
1319
1320static DEFINE_MUTEX(_event_lock);
1321void dm_table_event_callback(struct dm_table *t,
1322 void (*fn)(void *), void *context)
1323{
1324 mutex_lock(&_event_lock);
1325 t->event_fn = fn;
1326 t->event_context = context;
1327 mutex_unlock(&_event_lock);
1328}
1329
1330void dm_table_event(struct dm_table *t)
1331{
1332
1333
1334
1335
1336 BUG_ON(in_interrupt());
1337
1338 mutex_lock(&_event_lock);
1339 if (t->event_fn)
1340 t->event_fn(t->event_context);
1341 mutex_unlock(&_event_lock);
1342}
1343EXPORT_SYMBOL(dm_table_event);
1344
1345inline sector_t dm_table_get_size(struct dm_table *t)
1346{
1347 return t->num_targets ? (t->highs[t->num_targets - 1] + 1) : 0;
1348}
1349EXPORT_SYMBOL(dm_table_get_size);
1350
1351struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index)
1352{
1353 if (index >= t->num_targets)
1354 return NULL;
1355
1356 return t->targets + index;
1357}
1358
1359
1360
1361
1362
1363
1364
1365struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector)
1366{
1367 unsigned int l, n = 0, k = 0;
1368 sector_t *node;
1369
1370 if (unlikely(sector >= dm_table_get_size(t)))
1371 return &t->targets[t->num_targets];
1372
1373 for (l = 0; l < t->depth; l++) {
1374 n = get_child(n, k);
1375 node = get_node(t, l, n);
1376
1377 for (k = 0; k < KEYS_PER_NODE; k++)
1378 if (node[k] >= sector)
1379 break;
1380 }
1381
1382 return &t->targets[(KEYS_PER_NODE * n) + k];
1383}
1384
1385static int count_device(struct dm_target *ti, struct dm_dev *dev,
1386 sector_t start, sector_t len, void *data)
1387{
1388 unsigned *num_devices = data;
1389
1390 (*num_devices)++;
1391
1392 return 0;
1393}
1394
1395
1396
1397
1398
1399
1400
1401bool dm_table_has_no_data_devices(struct dm_table *table)
1402{
1403 struct dm_target *ti;
1404 unsigned i, num_devices;
1405
1406 for (i = 0; i < dm_table_get_num_targets(table); i++) {
1407 ti = dm_table_get_target(table, i);
1408
1409 if (!ti->type->iterate_devices)
1410 return false;
1411
1412 num_devices = 0;
1413 ti->type->iterate_devices(ti, count_device, &num_devices);
1414 if (num_devices)
1415 return false;
1416 }
1417
1418 return true;
1419}
1420
1421static int device_is_zoned_model(struct dm_target *ti, struct dm_dev *dev,
1422 sector_t start, sector_t len, void *data)
1423{
1424 struct request_queue *q = bdev_get_queue(dev->bdev);
1425 enum blk_zoned_model *zoned_model = data;
1426
1427 return q && blk_queue_zoned_model(q) == *zoned_model;
1428}
1429
1430static bool dm_table_supports_zoned_model(struct dm_table *t,
1431 enum blk_zoned_model zoned_model)
1432{
1433 struct dm_target *ti;
1434 unsigned i;
1435
1436 for (i = 0; i < dm_table_get_num_targets(t); i++) {
1437 ti = dm_table_get_target(t, i);
1438
1439 if (zoned_model == BLK_ZONED_HM &&
1440 !dm_target_supports_zoned_hm(ti->type))
1441 return false;
1442
1443 if (!ti->type->iterate_devices ||
1444 !ti->type->iterate_devices(ti, device_is_zoned_model, &zoned_model))
1445 return false;
1446 }
1447
1448 return true;
1449}
1450
1451static int device_matches_zone_sectors(struct dm_target *ti, struct dm_dev *dev,
1452 sector_t start, sector_t len, void *data)
1453{
1454 struct request_queue *q = bdev_get_queue(dev->bdev);
1455 unsigned int *zone_sectors = data;
1456
1457 return q && blk_queue_zone_sectors(q) == *zone_sectors;
1458}
1459
1460static bool dm_table_matches_zone_sectors(struct dm_table *t,
1461 unsigned int zone_sectors)
1462{
1463 struct dm_target *ti;
1464 unsigned i;
1465
1466 for (i = 0; i < dm_table_get_num_targets(t); i++) {
1467 ti = dm_table_get_target(t, i);
1468
1469 if (!ti->type->iterate_devices ||
1470 !ti->type->iterate_devices(ti, device_matches_zone_sectors, &zone_sectors))
1471 return false;
1472 }
1473
1474 return true;
1475}
1476
1477static int validate_hardware_zoned_model(struct dm_table *table,
1478 enum blk_zoned_model zoned_model,
1479 unsigned int zone_sectors)
1480{
1481 if (zoned_model == BLK_ZONED_NONE)
1482 return 0;
1483
1484 if (!dm_table_supports_zoned_model(table, zoned_model)) {
1485 DMERR("%s: zoned model is not consistent across all devices",
1486 dm_device_name(table->md));
1487 return -EINVAL;
1488 }
1489
1490
1491 if (!zone_sectors || !is_power_of_2(zone_sectors))
1492 return -EINVAL;
1493
1494 if (!dm_table_matches_zone_sectors(table, zone_sectors)) {
1495 DMERR("%s: zone sectors is not consistent across all devices",
1496 dm_device_name(table->md));
1497 return -EINVAL;
1498 }
1499
1500 return 0;
1501}
1502
1503
1504
1505
1506int dm_calculate_queue_limits(struct dm_table *table,
1507 struct queue_limits *limits)
1508{
1509 struct dm_target *ti;
1510 struct queue_limits ti_limits;
1511 unsigned i;
1512 enum blk_zoned_model zoned_model = BLK_ZONED_NONE;
1513 unsigned int zone_sectors = 0;
1514
1515 blk_set_stacking_limits(limits);
1516
1517 for (i = 0; i < dm_table_get_num_targets(table); i++) {
1518 blk_set_stacking_limits(&ti_limits);
1519
1520 ti = dm_table_get_target(table, i);
1521
1522 if (!ti->type->iterate_devices)
1523 goto combine_limits;
1524
1525
1526
1527
1528 ti->type->iterate_devices(ti, dm_set_device_limits,
1529 &ti_limits);
1530
1531 if (zoned_model == BLK_ZONED_NONE && ti_limits.zoned != BLK_ZONED_NONE) {
1532
1533
1534
1535
1536 zoned_model = ti_limits.zoned;
1537 zone_sectors = ti_limits.chunk_sectors;
1538 }
1539
1540
1541 if (ti->type->io_hints)
1542 ti->type->io_hints(ti, &ti_limits);
1543
1544
1545
1546
1547
1548 if (ti->type->iterate_devices(ti, device_area_is_invalid,
1549 &ti_limits))
1550 return -EINVAL;
1551
1552combine_limits:
1553
1554
1555
1556
1557 if (blk_stack_limits(limits, &ti_limits, 0) < 0)
1558 DMWARN("%s: adding target device "
1559 "(start sect %llu len %llu) "
1560 "caused an alignment inconsistency",
1561 dm_device_name(table->md),
1562 (unsigned long long) ti->begin,
1563 (unsigned long long) ti->len);
1564
1565
1566
1567
1568
1569 if (limits->zoned == BLK_ZONED_NONE && ti_limits.zoned != BLK_ZONED_NONE) {
1570
1571
1572
1573
1574
1575
1576
1577
1578 limits->zoned = ti_limits.zoned;
1579 }
1580 }
1581
1582
1583
1584
1585
1586
1587
1588
1589 if (limits->zoned != BLK_ZONED_NONE) {
1590
1591
1592
1593
1594 zoned_model = limits->zoned;
1595 zone_sectors = limits->chunk_sectors;
1596 }
1597 if (validate_hardware_zoned_model(table, zoned_model, zone_sectors))
1598 return -EINVAL;
1599
1600 return validate_hardware_logical_block_alignment(table, limits);
1601}
1602
1603
1604
1605
1606
1607
1608static void dm_table_verify_integrity(struct dm_table *t)
1609{
1610 struct gendisk *template_disk = NULL;
1611
1612 if (t->integrity_added)
1613 return;
1614
1615 if (t->integrity_supported) {
1616
1617
1618
1619
1620 template_disk = dm_table_get_integrity_disk(t);
1621 if (template_disk &&
1622 blk_integrity_compare(dm_disk(t->md), template_disk) >= 0)
1623 return;
1624 }
1625
1626 if (integrity_profile_exists(dm_disk(t->md))) {
1627 DMWARN("%s: unable to establish an integrity profile",
1628 dm_device_name(t->md));
1629 blk_integrity_unregister(dm_disk(t->md));
1630 }
1631}
1632
1633static int device_flush_capable(struct dm_target *ti, struct dm_dev *dev,
1634 sector_t start, sector_t len, void *data)
1635{
1636 unsigned long flush = (unsigned long) data;
1637 struct request_queue *q = bdev_get_queue(dev->bdev);
1638
1639 return q && (q->queue_flags & flush);
1640}
1641
1642static bool dm_table_supports_flush(struct dm_table *t, unsigned long flush)
1643{
1644 struct dm_target *ti;
1645 unsigned i;
1646
1647
1648
1649
1650
1651
1652
1653 for (i = 0; i < dm_table_get_num_targets(t); i++) {
1654 ti = dm_table_get_target(t, i);
1655
1656 if (!ti->num_flush_bios)
1657 continue;
1658
1659 if (ti->flush_supported)
1660 return true;
1661
1662 if (ti->type->iterate_devices &&
1663 ti->type->iterate_devices(ti, device_flush_capable, (void *) flush))
1664 return true;
1665 }
1666
1667 return false;
1668}
1669
1670static int device_dax_write_cache_enabled(struct dm_target *ti,
1671 struct dm_dev *dev, sector_t start,
1672 sector_t len, void *data)
1673{
1674 struct dax_device *dax_dev = dev->dax_dev;
1675
1676 if (!dax_dev)
1677 return false;
1678
1679 if (dax_write_cache_enabled(dax_dev))
1680 return true;
1681 return false;
1682}
1683
1684static int dm_table_supports_dax_write_cache(struct dm_table *t)
1685{
1686 struct dm_target *ti;
1687 unsigned i;
1688
1689 for (i = 0; i < dm_table_get_num_targets(t); i++) {
1690 ti = dm_table_get_target(t, i);
1691
1692 if (ti->type->iterate_devices &&
1693 ti->type->iterate_devices(ti,
1694 device_dax_write_cache_enabled, NULL))
1695 return true;
1696 }
1697
1698 return false;
1699}
1700
1701static int device_is_nonrot(struct dm_target *ti, struct dm_dev *dev,
1702 sector_t start, sector_t len, void *data)
1703{
1704 struct request_queue *q = bdev_get_queue(dev->bdev);
1705
1706 return q && blk_queue_nonrot(q);
1707}
1708
1709static int device_is_not_random(struct dm_target *ti, struct dm_dev *dev,
1710 sector_t start, sector_t len, void *data)
1711{
1712 struct request_queue *q = bdev_get_queue(dev->bdev);
1713
1714 return q && !blk_queue_add_random(q);
1715}
1716
1717static bool dm_table_all_devices_attribute(struct dm_table *t,
1718 iterate_devices_callout_fn func)
1719{
1720 struct dm_target *ti;
1721 unsigned i;
1722
1723 for (i = 0; i < dm_table_get_num_targets(t); i++) {
1724 ti = dm_table_get_target(t, i);
1725
1726 if (!ti->type->iterate_devices ||
1727 !ti->type->iterate_devices(ti, func, NULL))
1728 return false;
1729 }
1730
1731 return true;
1732}
1733
1734static int device_no_partial_completion(struct dm_target *ti, struct dm_dev *dev,
1735 sector_t start, sector_t len, void *data)
1736{
1737 char b[BDEVNAME_SIZE];
1738
1739
1740 return (strncmp(bdevname(dev->bdev, b), "nvme", 4) == 0);
1741}
1742
1743static bool dm_table_does_not_support_partial_completion(struct dm_table *t)
1744{
1745 return dm_table_all_devices_attribute(t, device_no_partial_completion);
1746}
1747
1748static int device_not_write_same_capable(struct dm_target *ti, struct dm_dev *dev,
1749 sector_t start, sector_t len, void *data)
1750{
1751 struct request_queue *q = bdev_get_queue(dev->bdev);
1752
1753 return q && !q->limits.max_write_same_sectors;
1754}
1755
1756static bool dm_table_supports_write_same(struct dm_table *t)
1757{
1758 struct dm_target *ti;
1759 unsigned i;
1760
1761 for (i = 0; i < dm_table_get_num_targets(t); i++) {
1762 ti = dm_table_get_target(t, i);
1763
1764 if (!ti->num_write_same_bios)
1765 return false;
1766
1767 if (!ti->type->iterate_devices ||
1768 ti->type->iterate_devices(ti, device_not_write_same_capable, NULL))
1769 return false;
1770 }
1771
1772 return true;
1773}
1774
1775static int device_not_write_zeroes_capable(struct dm_target *ti, struct dm_dev *dev,
1776 sector_t start, sector_t len, void *data)
1777{
1778 struct request_queue *q = bdev_get_queue(dev->bdev);
1779
1780 return q && !q->limits.max_write_zeroes_sectors;
1781}
1782
1783static bool dm_table_supports_write_zeroes(struct dm_table *t)
1784{
1785 struct dm_target *ti;
1786 unsigned i = 0;
1787
1788 while (i < dm_table_get_num_targets(t)) {
1789 ti = dm_table_get_target(t, i++);
1790
1791 if (!ti->num_write_zeroes_bios)
1792 return false;
1793
1794 if (!ti->type->iterate_devices ||
1795 ti->type->iterate_devices(ti, device_not_write_zeroes_capable, NULL))
1796 return false;
1797 }
1798
1799 return true;
1800}
1801
1802static int device_not_discard_capable(struct dm_target *ti, struct dm_dev *dev,
1803 sector_t start, sector_t len, void *data)
1804{
1805 struct request_queue *q = bdev_get_queue(dev->bdev);
1806
1807 return q && !blk_queue_discard(q);
1808}
1809
1810static bool dm_table_supports_discards(struct dm_table *t)
1811{
1812 struct dm_target *ti;
1813 unsigned i;
1814
1815 for (i = 0; i < dm_table_get_num_targets(t); i++) {
1816 ti = dm_table_get_target(t, i);
1817
1818 if (!ti->num_discard_bios)
1819 return false;
1820
1821
1822
1823
1824
1825
1826 if (!ti->discards_supported &&
1827 (!ti->type->iterate_devices ||
1828 ti->type->iterate_devices(ti, device_not_discard_capable, NULL)))
1829 return false;
1830 }
1831
1832 return true;
1833}
1834
1835static int device_not_secure_erase_capable(struct dm_target *ti,
1836 struct dm_dev *dev, sector_t start,
1837 sector_t len, void *data)
1838{
1839 struct request_queue *q = bdev_get_queue(dev->bdev);
1840
1841 return q && !blk_queue_secure_erase(q);
1842}
1843
1844static bool dm_table_supports_secure_erase(struct dm_table *t)
1845{
1846 struct dm_target *ti;
1847 unsigned int i;
1848
1849 for (i = 0; i < dm_table_get_num_targets(t); i++) {
1850 ti = dm_table_get_target(t, i);
1851
1852 if (!ti->num_secure_erase_bios)
1853 return false;
1854
1855 if (!ti->type->iterate_devices ||
1856 ti->type->iterate_devices(ti, device_not_secure_erase_capable, NULL))
1857 return false;
1858 }
1859
1860 return true;
1861}
1862
1863static int device_requires_stable_pages(struct dm_target *ti,
1864 struct dm_dev *dev, sector_t start,
1865 sector_t len, void *data)
1866{
1867 struct request_queue *q = bdev_get_queue(dev->bdev);
1868
1869 return q && bdi_cap_stable_pages_required(q->backing_dev_info);
1870}
1871
1872
1873
1874
1875
1876
1877static bool dm_table_requires_stable_pages(struct dm_table *t)
1878{
1879 struct dm_target *ti;
1880 unsigned i;
1881
1882 for (i = 0; i < dm_table_get_num_targets(t); i++) {
1883 ti = dm_table_get_target(t, i);
1884
1885 if (ti->type->iterate_devices &&
1886 ti->type->iterate_devices(ti, device_requires_stable_pages, NULL))
1887 return true;
1888 }
1889
1890 return false;
1891}
1892
1893void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
1894 struct queue_limits *limits)
1895{
1896 bool wc = false, fua = false;
1897 int page_size = PAGE_SIZE;
1898
1899
1900
1901
1902 q->limits = *limits;
1903
1904 if (!dm_table_supports_discards(t)) {
1905 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
1906
1907 q->limits.max_discard_sectors = 0;
1908 q->limits.max_hw_discard_sectors = 0;
1909 q->limits.discard_granularity = 0;
1910 q->limits.discard_alignment = 0;
1911 q->limits.discard_misaligned = 0;
1912 } else
1913 blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
1914
1915 if (dm_table_supports_secure_erase(t))
1916 blk_queue_flag_set(QUEUE_FLAG_SECERASE, q);
1917
1918 if (dm_table_supports_flush(t, (1UL << QUEUE_FLAG_WC))) {
1919 wc = true;
1920 if (dm_table_supports_flush(t, (1UL << QUEUE_FLAG_FUA)))
1921 fua = true;
1922 }
1923 blk_queue_write_cache(q, wc, fua);
1924
1925 if (dm_table_supports_dax(t, device_supports_dax, &page_size)) {
1926 blk_queue_flag_set(QUEUE_FLAG_DAX, q);
1927 if (dm_table_supports_dax(t, device_dax_synchronous, NULL))
1928 set_dax_synchronous(t->md->dax_dev);
1929 }
1930 else
1931 blk_queue_flag_clear(QUEUE_FLAG_DAX, q);
1932
1933 if (dm_table_supports_dax_write_cache(t))
1934 dax_write_cache(t->md->dax_dev, true);
1935
1936
1937 if (dm_table_all_devices_attribute(t, device_is_nonrot))
1938 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
1939 else
1940 blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
1941
1942 if (!dm_table_supports_write_same(t))
1943 q->limits.max_write_same_sectors = 0;
1944 if (!dm_table_supports_write_zeroes(t))
1945 q->limits.max_write_zeroes_sectors = 0;
1946
1947 dm_table_verify_integrity(t);
1948
1949
1950
1951
1952
1953 if (dm_table_requires_stable_pages(t))
1954 q->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES;
1955 else
1956 q->backing_dev_info->capabilities &= ~BDI_CAP_STABLE_WRITES;
1957
1958
1959
1960
1961
1962
1963
1964 if (blk_queue_add_random(q) && dm_table_all_devices_attribute(t, device_is_not_random))
1965 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
1966
1967
1968
1969
1970
1971
1972
1973
1974 if (blk_queue_is_zoned(q))
1975 blk_revalidate_disk_zones(t->md->disk);
1976
1977
1978 q->backing_dev_info->io_pages = limits->max_sectors >> (PAGE_SHIFT - 9);
1979}
1980
1981unsigned int dm_table_get_num_targets(struct dm_table *t)
1982{
1983 return t->num_targets;
1984}
1985
1986struct list_head *dm_table_get_devices(struct dm_table *t)
1987{
1988 return &t->devices;
1989}
1990
1991fmode_t dm_table_get_mode(struct dm_table *t)
1992{
1993 return t->mode;
1994}
1995EXPORT_SYMBOL(dm_table_get_mode);
1996
1997enum suspend_mode {
1998 PRESUSPEND,
1999 PRESUSPEND_UNDO,
2000 POSTSUSPEND,
2001};
2002
2003static void suspend_targets(struct dm_table *t, enum suspend_mode mode)
2004{
2005 int i = t->num_targets;
2006 struct dm_target *ti = t->targets;
2007
2008 lockdep_assert_held(&t->md->suspend_lock);
2009
2010 while (i--) {
2011 switch (mode) {
2012 case PRESUSPEND:
2013 if (ti->type->presuspend)
2014 ti->type->presuspend(ti);
2015 break;
2016 case PRESUSPEND_UNDO:
2017 if (ti->type->presuspend_undo)
2018 ti->type->presuspend_undo(ti);
2019 break;
2020 case POSTSUSPEND:
2021 if (ti->type->postsuspend)
2022 ti->type->postsuspend(ti);
2023 break;
2024 }
2025 ti++;
2026 }
2027}
2028
2029void dm_table_presuspend_targets(struct dm_table *t)
2030{
2031 if (!t)
2032 return;
2033
2034 suspend_targets(t, PRESUSPEND);
2035}
2036
2037void dm_table_presuspend_undo_targets(struct dm_table *t)
2038{
2039 if (!t)
2040 return;
2041
2042 suspend_targets(t, PRESUSPEND_UNDO);
2043}
2044
2045void dm_table_postsuspend_targets(struct dm_table *t)
2046{
2047 if (!t)
2048 return;
2049
2050 suspend_targets(t, POSTSUSPEND);
2051}
2052
2053int dm_table_resume_targets(struct dm_table *t)
2054{
2055 int i, r = 0;
2056
2057 lockdep_assert_held(&t->md->suspend_lock);
2058
2059 for (i = 0; i < t->num_targets; i++) {
2060 struct dm_target *ti = t->targets + i;
2061
2062 if (!ti->type->preresume)
2063 continue;
2064
2065 r = ti->type->preresume(ti);
2066 if (r) {
2067 DMERR("%s: %s: preresume failed, error = %d",
2068 dm_device_name(t->md), ti->type->name, r);
2069 return r;
2070 }
2071 }
2072
2073 for (i = 0; i < t->num_targets; i++) {
2074 struct dm_target *ti = t->targets + i;
2075
2076 if (ti->type->resume)
2077 ti->type->resume(ti);
2078 }
2079
2080 return 0;
2081}
2082
2083void dm_table_add_target_callbacks(struct dm_table *t, struct dm_target_callbacks *cb)
2084{
2085 list_add(&cb->list, &t->target_callbacks);
2086}
2087EXPORT_SYMBOL_GPL(dm_table_add_target_callbacks);
2088
2089int dm_table_any_congested(struct dm_table *t, int bdi_bits)
2090{
2091 struct dm_dev_internal *dd;
2092 struct list_head *devices = dm_table_get_devices(t);
2093 struct dm_target_callbacks *cb;
2094 int r = 0;
2095
2096 list_for_each_entry(dd, devices, list) {
2097 struct request_queue *q = bdev_get_queue(dd->dm_dev->bdev);
2098 char b[BDEVNAME_SIZE];
2099
2100 if (likely(q))
2101 r |= bdi_congested(q->backing_dev_info, bdi_bits);
2102 else
2103 DMWARN_LIMIT("%s: any_congested: nonexistent device %s",
2104 dm_device_name(t->md),
2105 bdevname(dd->dm_dev->bdev, b));
2106 }
2107
2108 list_for_each_entry(cb, &t->target_callbacks, list)
2109 if (cb->congested_fn)
2110 r |= cb->congested_fn(cb, bdi_bits);
2111
2112 return r;
2113}
2114
2115struct mapped_device *dm_table_get_md(struct dm_table *t)
2116{
2117 return t->md;
2118}
2119EXPORT_SYMBOL(dm_table_get_md);
2120
2121const char *dm_table_device_name(struct dm_table *t)
2122{
2123 return dm_device_name(t->md);
2124}
2125EXPORT_SYMBOL_GPL(dm_table_device_name);
2126
2127void dm_table_run_md_queue_async(struct dm_table *t)
2128{
2129 struct mapped_device *md;
2130 struct request_queue *queue;
2131
2132 if (!dm_table_request_based(t))
2133 return;
2134
2135 md = dm_table_get_md(t);
2136 queue = dm_get_md_queue(md);
2137 if (queue)
2138 blk_mq_run_hw_queues(queue, true);
2139}
2140EXPORT_SYMBOL(dm_table_run_md_queue_async);
2141
2142