1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2001 Sistina Software (UK) Limited.
4 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
6 * This file is released under the GPL.
12 #include <linux/module.h>
13 #include <linux/vmalloc.h>
14 #include <linux/blkdev.h>
15 #include <linux/blk-integrity.h>
16 #include <linux/namei.h>
17 #include <linux/ctype.h>
18 #include <linux/string.h>
19 #include <linux/slab.h>
20 #include <linux/interrupt.h>
21 #include <linux/mutex.h>
22 #include <linux/delay.h>
23 #include <linux/atomic.h>
24 #include <linux/blk-mq.h>
25 #include <linux/mount.h>
26 #include <linux/dax.h>
28 #define DM_MSG_PREFIX "table"
30 #define NODE_SIZE L1_CACHE_BYTES
31 #define KEYS_PER_NODE (NODE_SIZE / sizeof(sector_t))
32 #define CHILDREN_PER_NODE (KEYS_PER_NODE + 1)
35 * Similar to ceiling(log_size(n))
37 static unsigned int int_log(unsigned int n, unsigned int base)
42 n = dm_div_up(n, base);
50 * Calculate the index of the child node of the n'th node k'th key.
52 static inline unsigned int get_child(unsigned int n, unsigned int k)
54 return (n * CHILDREN_PER_NODE) + k;
58 * Return the n'th node of level l from table t.
60 static inline sector_t *get_node(struct dm_table *t,
61 unsigned int l, unsigned int n)
63 return t->index[l] + (n * KEYS_PER_NODE);
67 * Return the highest key that you could lookup from the n'th
68 * node on level l of the btree.
70 static sector_t high(struct dm_table *t, unsigned int l, unsigned int n)
72 for (; l < t->depth - 1; l++)
73 n = get_child(n, CHILDREN_PER_NODE - 1);
75 if (n >= t->counts[l])
78 return get_node(t, l, n)[KEYS_PER_NODE - 1];
82 * Fills in a level of the btree based on the highs of the level
85 static int setup_btree_index(unsigned int l, struct dm_table *t)
90 for (n = 0U; n < t->counts[l]; n++) {
91 node = get_node(t, l, n);
93 for (k = 0U; k < KEYS_PER_NODE; k++)
94 node[k] = high(t, l + 1, get_child(n, k));
101 * highs, and targets are managed as dynamic arrays during a
104 static int alloc_targets(struct dm_table *t, unsigned int num)
107 struct dm_target *n_targets;
110 * Allocate both the target array and offset array at once.
112 n_highs = kvcalloc(num, sizeof(struct dm_target) + sizeof(sector_t),
117 n_targets = (struct dm_target *) (n_highs + num);
119 memset(n_highs, -1, sizeof(*n_highs) * num);
122 t->num_allocated = num;
124 t->targets = n_targets;
129 int dm_table_create(struct dm_table **result, blk_mode_t mode,
130 unsigned int num_targets, struct mapped_device *md)
134 if (num_targets > DM_MAX_TARGETS)
137 t = kzalloc(sizeof(*t), GFP_KERNEL);
142 INIT_LIST_HEAD(&t->devices);
143 init_rwsem(&t->devices_lock);
146 num_targets = KEYS_PER_NODE;
148 num_targets = dm_round_up(num_targets, KEYS_PER_NODE);
155 if (alloc_targets(t, num_targets)) {
160 t->type = DM_TYPE_NONE;
167 static void free_devices(struct list_head *devices, struct mapped_device *md)
169 struct list_head *tmp, *next;
171 list_for_each_safe(tmp, next, devices) {
172 struct dm_dev_internal *dd =
173 list_entry(tmp, struct dm_dev_internal, list);
174 DMWARN("%s: dm_table_destroy: dm_put_device call missing for %s",
175 dm_device_name(md), dd->dm_dev->name);
176 dm_put_table_device(md, dd->dm_dev);
181 static void dm_table_destroy_crypto_profile(struct dm_table *t);
183 void dm_table_destroy(struct dm_table *t)
188 /* free the indexes */
190 kvfree(t->index[t->depth - 2]);
192 /* free the targets */
193 for (unsigned int i = 0; i < t->num_targets; i++) {
194 struct dm_target *ti = dm_table_get_target(t, i);
199 dm_put_target_type(ti->type);
204 /* free the device list */
205 free_devices(&t->devices, t->md);
207 dm_free_md_mempools(t->mempools);
209 dm_table_destroy_crypto_profile(t);
215 * See if we've already got a device in the list.
217 static struct dm_dev_internal *find_device(struct list_head *l, dev_t dev)
219 struct dm_dev_internal *dd;
221 list_for_each_entry(dd, l, list)
222 if (dd->dm_dev->bdev->bd_dev == dev)
229 * If possible, this checks an area of a destination device is invalid.
231 static int device_area_is_invalid(struct dm_target *ti, struct dm_dev *dev,
232 sector_t start, sector_t len, void *data)
234 struct queue_limits *limits = data;
235 struct block_device *bdev = dev->bdev;
236 sector_t dev_size = bdev_nr_sectors(bdev);
237 unsigned short logical_block_size_sectors =
238 limits->logical_block_size >> SECTOR_SHIFT;
243 if ((start >= dev_size) || (start + len > dev_size)) {
244 DMERR("%s: %pg too small for target: start=%llu, len=%llu, dev_size=%llu",
245 dm_device_name(ti->table->md), bdev,
246 (unsigned long long)start,
247 (unsigned long long)len,
248 (unsigned long long)dev_size);
253 * If the target is mapped to zoned block device(s), check
254 * that the zones are not partially mapped.
256 if (bdev_is_zoned(bdev)) {
257 unsigned int zone_sectors = bdev_zone_sectors(bdev);
259 if (start & (zone_sectors - 1)) {
260 DMERR("%s: start=%llu not aligned to h/w zone size %u of %pg",
261 dm_device_name(ti->table->md),
262 (unsigned long long)start,
268 * Note: The last zone of a zoned block device may be smaller
269 * than other zones. So for a target mapping the end of a
270 * zoned block device with such a zone, len would not be zone
271 * aligned. We do not allow such last smaller zone to be part
272 * of the mapping here to ensure that mappings with multiple
273 * devices do not end up with a smaller zone in the middle of
276 if (len & (zone_sectors - 1)) {
277 DMERR("%s: len=%llu not aligned to h/w zone size %u of %pg",
278 dm_device_name(ti->table->md),
279 (unsigned long long)len,
285 if (logical_block_size_sectors <= 1)
288 if (start & (logical_block_size_sectors - 1)) {
289 DMERR("%s: start=%llu not aligned to h/w logical block size %u of %pg",
290 dm_device_name(ti->table->md),
291 (unsigned long long)start,
292 limits->logical_block_size, bdev);
296 if (len & (logical_block_size_sectors - 1)) {
297 DMERR("%s: len=%llu not aligned to h/w logical block size %u of %pg",
298 dm_device_name(ti->table->md),
299 (unsigned long long)len,
300 limits->logical_block_size, bdev);
308 * This upgrades the mode on an already open dm_dev, being
309 * careful to leave things as they were if we fail to reopen the
310 * device and not to touch the existing bdev field in case
311 * it is accessed concurrently.
313 static int upgrade_mode(struct dm_dev_internal *dd, blk_mode_t new_mode,
314 struct mapped_device *md)
317 struct dm_dev *old_dev, *new_dev;
319 old_dev = dd->dm_dev;
321 r = dm_get_table_device(md, dd->dm_dev->bdev->bd_dev,
322 dd->dm_dev->mode | new_mode, &new_dev);
326 dd->dm_dev = new_dev;
327 dm_put_table_device(md, old_dev);
333 * Add a device to the list, or just increment the usage count if
334 * it's already present.
336 * Note: the __ref annotation is because this function can call the __init
337 * marked early_lookup_bdev when called during early boot code from dm-init.c.
339 int __ref dm_get_device(struct dm_target *ti, const char *path, blk_mode_t mode,
340 struct dm_dev **result)
344 unsigned int major, minor;
346 struct dm_dev_internal *dd;
347 struct dm_table *t = ti->table;
351 if (sscanf(path, "%u:%u%c", &major, &minor, &dummy) == 2) {
352 /* Extract the major/minor numbers */
353 dev = MKDEV(major, minor);
354 if (MAJOR(dev) != major || MINOR(dev) != minor)
357 r = lookup_bdev(path, &dev);
359 if (r && system_state < SYSTEM_RUNNING)
360 r = early_lookup_bdev(path, &dev);
365 if (dev == disk_devt(t->md->disk))
368 down_write(&t->devices_lock);
370 dd = find_device(&t->devices, dev);
372 dd = kmalloc(sizeof(*dd), GFP_KERNEL);
378 r = dm_get_table_device(t->md, dev, mode, &dd->dm_dev);
384 refcount_set(&dd->count, 1);
385 list_add(&dd->list, &t->devices);
388 } else if (dd->dm_dev->mode != (mode | dd->dm_dev->mode)) {
389 r = upgrade_mode(dd, mode, t->md);
393 refcount_inc(&dd->count);
395 up_write(&t->devices_lock);
396 *result = dd->dm_dev;
400 up_write(&t->devices_lock);
403 EXPORT_SYMBOL(dm_get_device);
405 static int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev,
406 sector_t start, sector_t len, void *data)
408 struct queue_limits *limits = data;
409 struct block_device *bdev = dev->bdev;
410 struct request_queue *q = bdev_get_queue(bdev);
413 DMWARN("%s: Cannot set limits for nonexistent device %pg",
414 dm_device_name(ti->table->md), bdev);
418 if (blk_stack_limits(limits, &q->limits,
419 get_start_sect(bdev) + start) < 0)
420 DMWARN("%s: adding target device %pg caused an alignment inconsistency: "
421 "physical_block_size=%u, logical_block_size=%u, "
422 "alignment_offset=%u, start=%llu",
423 dm_device_name(ti->table->md), bdev,
424 q->limits.physical_block_size,
425 q->limits.logical_block_size,
426 q->limits.alignment_offset,
427 (unsigned long long) start << SECTOR_SHIFT);
432 * Decrement a device's use count and remove it if necessary.
434 void dm_put_device(struct dm_target *ti, struct dm_dev *d)
437 struct dm_table *t = ti->table;
438 struct list_head *devices = &t->devices;
439 struct dm_dev_internal *dd;
441 down_write(&t->devices_lock);
443 list_for_each_entry(dd, devices, list) {
444 if (dd->dm_dev == d) {
450 DMERR("%s: device %s not in table devices list",
451 dm_device_name(t->md), d->name);
454 if (refcount_dec_and_test(&dd->count)) {
455 dm_put_table_device(t->md, d);
461 up_write(&t->devices_lock);
463 EXPORT_SYMBOL(dm_put_device);
466 * Checks to see if the target joins onto the end of the table.
468 static int adjoin(struct dm_table *t, struct dm_target *ti)
470 struct dm_target *prev;
475 prev = &t->targets[t->num_targets - 1];
476 return (ti->begin == (prev->begin + prev->len));
480 * Used to dynamically allocate the arg array.
482 * We do first allocation with GFP_NOIO because dm-mpath and dm-thin must
483 * process messages even if some device is suspended. These messages have a
484 * small fixed number of arguments.
486 * On the other hand, dm-switch needs to process bulk data using messages and
487 * excessive use of GFP_NOIO could cause trouble.
489 static char **realloc_argv(unsigned int *size, char **old_argv)
492 unsigned int new_size;
496 new_size = *size * 2;
502 argv = kmalloc_array(new_size, sizeof(*argv), gfp);
503 if (argv && old_argv) {
504 memcpy(argv, old_argv, *size * sizeof(*argv));
513 * Destructively splits up the argument list to pass to ctr.
515 int dm_split_args(int *argc, char ***argvp, char *input)
517 char *start, *end = input, *out, **argv = NULL;
518 unsigned int array_size = 0;
527 argv = realloc_argv(&array_size, argv);
532 /* Skip whitespace */
533 start = skip_spaces(end);
536 break; /* success, we hit the end */
538 /* 'out' is used to remove any back-quotes */
541 /* Everything apart from '\0' can be quoted */
542 if (*end == '\\' && *(end + 1)) {
549 break; /* end of token */
554 /* have we already filled the array ? */
555 if ((*argc + 1) > array_size) {
556 argv = realloc_argv(&array_size, argv);
561 /* we know this is whitespace */
565 /* terminate the string and put it in the array */
576 * Impose necessary and sufficient conditions on a devices's table such
577 * that any incoming bio which respects its logical_block_size can be
578 * processed successfully. If it falls across the boundary between
579 * two or more targets, the size of each piece it gets split into must
580 * be compatible with the logical_block_size of the target processing it.
582 static int validate_hardware_logical_block_alignment(struct dm_table *t,
583 struct queue_limits *limits)
586 * This function uses arithmetic modulo the logical_block_size
587 * (in units of 512-byte sectors).
589 unsigned short device_logical_block_size_sects =
590 limits->logical_block_size >> SECTOR_SHIFT;
593 * Offset of the start of the next table entry, mod logical_block_size.
595 unsigned short next_target_start = 0;
598 * Given an aligned bio that extends beyond the end of a
599 * target, how many sectors must the next target handle?
601 unsigned short remaining = 0;
603 struct dm_target *ti;
604 struct queue_limits ti_limits;
608 * Check each entry in the table in turn.
610 for (i = 0; i < t->num_targets; i++) {
611 ti = dm_table_get_target(t, i);
613 blk_set_stacking_limits(&ti_limits);
615 /* combine all target devices' limits */
616 if (ti->type->iterate_devices)
617 ti->type->iterate_devices(ti, dm_set_device_limits,
621 * If the remaining sectors fall entirely within this
622 * table entry are they compatible with its logical_block_size?
624 if (remaining < ti->len &&
625 remaining & ((ti_limits.logical_block_size >>
630 (unsigned short) ((next_target_start + ti->len) &
631 (device_logical_block_size_sects - 1));
632 remaining = next_target_start ?
633 device_logical_block_size_sects - next_target_start : 0;
637 DMERR("%s: table line %u (start sect %llu len %llu) "
638 "not aligned to h/w logical block size %u",
639 dm_device_name(t->md), i,
640 (unsigned long long) ti->begin,
641 (unsigned long long) ti->len,
642 limits->logical_block_size);
649 int dm_table_add_target(struct dm_table *t, const char *type,
650 sector_t start, sector_t len, char *params)
652 int r = -EINVAL, argc;
654 struct dm_target *ti;
657 DMERR("%s: target type %s must appear alone in table",
658 dm_device_name(t->md), t->targets->type->name);
662 BUG_ON(t->num_targets >= t->num_allocated);
664 ti = t->targets + t->num_targets;
665 memset(ti, 0, sizeof(*ti));
668 DMERR("%s: zero-length target", dm_device_name(t->md));
672 ti->type = dm_get_target_type(type);
674 DMERR("%s: %s: unknown target type", dm_device_name(t->md), type);
678 if (dm_target_needs_singleton(ti->type)) {
679 if (t->num_targets) {
680 ti->error = "singleton target type must appear alone in table";
686 if (dm_target_always_writeable(ti->type) &&
687 !(t->mode & BLK_OPEN_WRITE)) {
688 ti->error = "target type may not be included in a read-only table";
692 if (t->immutable_target_type) {
693 if (t->immutable_target_type != ti->type) {
694 ti->error = "immutable target type cannot be mixed with other target types";
697 } else if (dm_target_is_immutable(ti->type)) {
698 if (t->num_targets) {
699 ti->error = "immutable target type cannot be mixed with other target types";
702 t->immutable_target_type = ti->type;
705 if (dm_target_has_integrity(ti->type))
706 t->integrity_added = 1;
711 ti->error = "Unknown error";
714 * Does this target adjoin the previous one ?
716 if (!adjoin(t, ti)) {
717 ti->error = "Gap in table";
721 r = dm_split_args(&argc, &argv, params);
723 ti->error = "couldn't split parameters";
727 r = ti->type->ctr(ti, argc, argv);
732 t->highs[t->num_targets++] = ti->begin + ti->len - 1;
734 if (!ti->num_discard_bios && ti->discards_supported)
735 DMWARN("%s: %s: ignoring discards_supported because num_discard_bios is zero.",
736 dm_device_name(t->md), type);
738 if (ti->limit_swap_bios && !static_key_enabled(&swap_bios_enabled.key))
739 static_branch_enable(&swap_bios_enabled);
744 DMERR("%s: %s: %s (%pe)", dm_device_name(t->md), type, ti->error, ERR_PTR(r));
745 dm_put_target_type(ti->type);
750 * Target argument parsing helpers.
752 static int validate_next_arg(const struct dm_arg *arg, struct dm_arg_set *arg_set,
753 unsigned int *value, char **error, unsigned int grouped)
755 const char *arg_str = dm_shift_arg(arg_set);
759 (sscanf(arg_str, "%u%c", value, &dummy) != 1) ||
760 (*value < arg->min) ||
761 (*value > arg->max) ||
762 (grouped && arg_set->argc < *value)) {
770 int dm_read_arg(const struct dm_arg *arg, struct dm_arg_set *arg_set,
771 unsigned int *value, char **error)
773 return validate_next_arg(arg, arg_set, value, error, 0);
775 EXPORT_SYMBOL(dm_read_arg);
777 int dm_read_arg_group(const struct dm_arg *arg, struct dm_arg_set *arg_set,
778 unsigned int *value, char **error)
780 return validate_next_arg(arg, arg_set, value, error, 1);
782 EXPORT_SYMBOL(dm_read_arg_group);
784 const char *dm_shift_arg(struct dm_arg_set *as)
797 EXPORT_SYMBOL(dm_shift_arg);
799 void dm_consume_args(struct dm_arg_set *as, unsigned int num_args)
801 BUG_ON(as->argc < num_args);
802 as->argc -= num_args;
803 as->argv += num_args;
805 EXPORT_SYMBOL(dm_consume_args);
807 static bool __table_type_bio_based(enum dm_queue_mode table_type)
809 return (table_type == DM_TYPE_BIO_BASED ||
810 table_type == DM_TYPE_DAX_BIO_BASED);
813 static bool __table_type_request_based(enum dm_queue_mode table_type)
815 return table_type == DM_TYPE_REQUEST_BASED;
818 void dm_table_set_type(struct dm_table *t, enum dm_queue_mode type)
822 EXPORT_SYMBOL_GPL(dm_table_set_type);
824 /* validate the dax capability of the target device span */
825 static int device_not_dax_capable(struct dm_target *ti, struct dm_dev *dev,
826 sector_t start, sector_t len, void *data)
831 DMDEBUG("%pg: error: dax unsupported by block device", dev->bdev);
835 /* Check devices support synchronous DAX */
836 static int device_not_dax_synchronous_capable(struct dm_target *ti, struct dm_dev *dev,
837 sector_t start, sector_t len, void *data)
839 return !dev->dax_dev || !dax_synchronous(dev->dax_dev);
842 static bool dm_table_supports_dax(struct dm_table *t,
843 iterate_devices_callout_fn iterate_fn)
845 /* Ensure that all targets support DAX. */
846 for (unsigned int i = 0; i < t->num_targets; i++) {
847 struct dm_target *ti = dm_table_get_target(t, i);
849 if (!ti->type->direct_access)
852 if (dm_target_is_wildcard(ti->type) ||
853 !ti->type->iterate_devices ||
854 ti->type->iterate_devices(ti, iterate_fn, NULL))
861 static int device_is_rq_stackable(struct dm_target *ti, struct dm_dev *dev,
862 sector_t start, sector_t len, void *data)
864 struct block_device *bdev = dev->bdev;
865 struct request_queue *q = bdev_get_queue(bdev);
867 /* request-based cannot stack on partitions! */
868 if (bdev_is_partition(bdev))
871 return queue_is_mq(q);
874 static int dm_table_determine_type(struct dm_table *t)
876 unsigned int bio_based = 0, request_based = 0, hybrid = 0;
877 struct dm_target *ti;
878 struct list_head *devices = dm_table_get_devices(t);
879 enum dm_queue_mode live_md_type = dm_get_md_type(t->md);
881 if (t->type != DM_TYPE_NONE) {
882 /* target already set the table's type */
883 if (t->type == DM_TYPE_BIO_BASED) {
884 /* possibly upgrade to a variant of bio-based */
885 goto verify_bio_based;
887 BUG_ON(t->type == DM_TYPE_DAX_BIO_BASED);
888 goto verify_rq_based;
891 for (unsigned int i = 0; i < t->num_targets; i++) {
892 ti = dm_table_get_target(t, i);
893 if (dm_target_hybrid(ti))
895 else if (dm_target_request_based(ti))
900 if (bio_based && request_based) {
901 DMERR("Inconsistent table: different target types can't be mixed up");
906 if (hybrid && !bio_based && !request_based) {
908 * The targets can work either way.
909 * Determine the type from the live device.
910 * Default to bio-based if device is new.
912 if (__table_type_request_based(live_md_type))
920 /* We must use this table as bio-based */
921 t->type = DM_TYPE_BIO_BASED;
922 if (dm_table_supports_dax(t, device_not_dax_capable) ||
923 (list_empty(devices) && live_md_type == DM_TYPE_DAX_BIO_BASED)) {
924 t->type = DM_TYPE_DAX_BIO_BASED;
929 BUG_ON(!request_based); /* No targets in this table */
931 t->type = DM_TYPE_REQUEST_BASED;
935 * Request-based dm supports only tables that have a single target now.
936 * To support multiple targets, request splitting support is needed,
937 * and that needs lots of changes in the block-layer.
938 * (e.g. request completion process for partial completion.)
940 if (t->num_targets > 1) {
941 DMERR("request-based DM doesn't support multiple targets");
945 if (list_empty(devices)) {
947 struct dm_table *live_table = dm_get_live_table(t->md, &srcu_idx);
949 /* inherit live table's type */
951 t->type = live_table->type;
952 dm_put_live_table(t->md, srcu_idx);
956 ti = dm_table_get_immutable_target(t);
958 DMERR("table load rejected: immutable target is required");
960 } else if (ti->max_io_len) {
961 DMERR("table load rejected: immutable target that splits IO is not supported");
965 /* Non-request-stackable devices can't be used for request-based dm */
966 if (!ti->type->iterate_devices ||
967 !ti->type->iterate_devices(ti, device_is_rq_stackable, NULL)) {
968 DMERR("table load rejected: including non-request-stackable devices");
975 enum dm_queue_mode dm_table_get_type(struct dm_table *t)
980 struct target_type *dm_table_get_immutable_target_type(struct dm_table *t)
982 return t->immutable_target_type;
985 struct dm_target *dm_table_get_immutable_target(struct dm_table *t)
987 /* Immutable target is implicitly a singleton */
988 if (t->num_targets > 1 ||
989 !dm_target_is_immutable(t->targets[0].type))
995 struct dm_target *dm_table_get_wildcard_target(struct dm_table *t)
997 for (unsigned int i = 0; i < t->num_targets; i++) {
998 struct dm_target *ti = dm_table_get_target(t, i);
1000 if (dm_target_is_wildcard(ti->type))
1007 bool dm_table_bio_based(struct dm_table *t)
1009 return __table_type_bio_based(dm_table_get_type(t));
1012 bool dm_table_request_based(struct dm_table *t)
1014 return __table_type_request_based(dm_table_get_type(t));
1017 static bool dm_table_supports_poll(struct dm_table *t);
1019 static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *md)
1021 enum dm_queue_mode type = dm_table_get_type(t);
1022 unsigned int per_io_data_size = 0, front_pad, io_front_pad;
1023 unsigned int min_pool_size = 0, pool_size;
1024 struct dm_md_mempools *pools;
1026 if (unlikely(type == DM_TYPE_NONE)) {
1027 DMERR("no table type is set, can't allocate mempools");
1031 pools = kzalloc_node(sizeof(*pools), GFP_KERNEL, md->numa_node_id);
1035 if (type == DM_TYPE_REQUEST_BASED) {
1036 pool_size = dm_get_reserved_rq_based_ios();
1037 front_pad = offsetof(struct dm_rq_clone_bio_info, clone);
1041 for (unsigned int i = 0; i < t->num_targets; i++) {
1042 struct dm_target *ti = dm_table_get_target(t, i);
1044 per_io_data_size = max(per_io_data_size, ti->per_io_data_size);
1045 min_pool_size = max(min_pool_size, ti->num_flush_bios);
1047 pool_size = max(dm_get_reserved_bio_based_ios(), min_pool_size);
1048 front_pad = roundup(per_io_data_size,
1049 __alignof__(struct dm_target_io)) + DM_TARGET_IO_BIO_OFFSET;
1051 io_front_pad = roundup(per_io_data_size,
1052 __alignof__(struct dm_io)) + DM_IO_BIO_OFFSET;
1053 if (bioset_init(&pools->io_bs, pool_size, io_front_pad,
1054 dm_table_supports_poll(t) ? BIOSET_PERCPU_CACHE : 0))
1055 goto out_free_pools;
1056 if (t->integrity_supported &&
1057 bioset_integrity_create(&pools->io_bs, pool_size))
1058 goto out_free_pools;
1060 if (bioset_init(&pools->bs, pool_size, front_pad, 0))
1061 goto out_free_pools;
1062 if (t->integrity_supported &&
1063 bioset_integrity_create(&pools->bs, pool_size))
1064 goto out_free_pools;
1066 t->mempools = pools;
1070 dm_free_md_mempools(pools);
1074 static int setup_indexes(struct dm_table *t)
1077 unsigned int total = 0;
1080 /* allocate the space for *all* the indexes */
1081 for (i = t->depth - 2; i >= 0; i--) {
1082 t->counts[i] = dm_div_up(t->counts[i + 1], CHILDREN_PER_NODE);
1083 total += t->counts[i];
1086 indexes = kvcalloc(total, NODE_SIZE, GFP_KERNEL);
1090 /* set up internal nodes, bottom-up */
1091 for (i = t->depth - 2; i >= 0; i--) {
1092 t->index[i] = indexes;
1093 indexes += (KEYS_PER_NODE * t->counts[i]);
1094 setup_btree_index(i, t);
1101 * Builds the btree to index the map.
1103 static int dm_table_build_index(struct dm_table *t)
1106 unsigned int leaf_nodes;
1108 /* how many indexes will the btree have ? */
1109 leaf_nodes = dm_div_up(t->num_targets, KEYS_PER_NODE);
1110 t->depth = 1 + int_log(leaf_nodes, CHILDREN_PER_NODE);
1112 /* leaf layer has already been set up */
1113 t->counts[t->depth - 1] = leaf_nodes;
1114 t->index[t->depth - 1] = t->highs;
1117 r = setup_indexes(t);
1122 static bool integrity_profile_exists(struct gendisk *disk)
1124 return !!blk_get_integrity(disk);
1128 * Get a disk whose integrity profile reflects the table's profile.
1129 * Returns NULL if integrity support was inconsistent or unavailable.
1131 static struct gendisk *dm_table_get_integrity_disk(struct dm_table *t)
1133 struct list_head *devices = dm_table_get_devices(t);
1134 struct dm_dev_internal *dd = NULL;
1135 struct gendisk *prev_disk = NULL, *template_disk = NULL;
1137 for (unsigned int i = 0; i < t->num_targets; i++) {
1138 struct dm_target *ti = dm_table_get_target(t, i);
1140 if (!dm_target_passes_integrity(ti->type))
1144 list_for_each_entry(dd, devices, list) {
1145 template_disk = dd->dm_dev->bdev->bd_disk;
1146 if (!integrity_profile_exists(template_disk))
1148 else if (prev_disk &&
1149 blk_integrity_compare(prev_disk, template_disk) < 0)
1151 prev_disk = template_disk;
1154 return template_disk;
1158 DMWARN("%s: integrity not set: %s and %s profile mismatch",
1159 dm_device_name(t->md),
1160 prev_disk->disk_name,
1161 template_disk->disk_name);
1166 * Register the mapped device for blk_integrity support if the
1167 * underlying devices have an integrity profile. But all devices may
1168 * not have matching profiles (checking all devices isn't reliable
1169 * during table load because this table may use other DM device(s) which
1170 * must be resumed before they will have an initialized integity
1171 * profile). Consequently, stacked DM devices force a 2 stage integrity
1172 * profile validation: First pass during table load, final pass during
1175 static int dm_table_register_integrity(struct dm_table *t)
1177 struct mapped_device *md = t->md;
1178 struct gendisk *template_disk = NULL;
1180 /* If target handles integrity itself do not register it here. */
1181 if (t->integrity_added)
1184 template_disk = dm_table_get_integrity_disk(t);
1188 if (!integrity_profile_exists(dm_disk(md))) {
1189 t->integrity_supported = true;
1191 * Register integrity profile during table load; we can do
1192 * this because the final profile must match during resume.
1194 blk_integrity_register(dm_disk(md),
1195 blk_get_integrity(template_disk));
1200 * If DM device already has an initialized integrity
1201 * profile the new profile should not conflict.
1203 if (blk_integrity_compare(dm_disk(md), template_disk) < 0) {
1204 DMERR("%s: conflict with existing integrity profile: %s profile mismatch",
1205 dm_device_name(t->md),
1206 template_disk->disk_name);
1210 /* Preserve existing integrity profile */
1211 t->integrity_supported = true;
1215 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
1217 struct dm_crypto_profile {
1218 struct blk_crypto_profile profile;
1219 struct mapped_device *md;
1222 static int dm_keyslot_evict_callback(struct dm_target *ti, struct dm_dev *dev,
1223 sector_t start, sector_t len, void *data)
1225 const struct blk_crypto_key *key = data;
1227 blk_crypto_evict_key(dev->bdev, key);
1232 * When an inline encryption key is evicted from a device-mapper device, evict
1233 * it from all the underlying devices.
1235 static int dm_keyslot_evict(struct blk_crypto_profile *profile,
1236 const struct blk_crypto_key *key, unsigned int slot)
1238 struct mapped_device *md =
1239 container_of(profile, struct dm_crypto_profile, profile)->md;
1243 t = dm_get_live_table(md, &srcu_idx);
1247 for (unsigned int i = 0; i < t->num_targets; i++) {
1248 struct dm_target *ti = dm_table_get_target(t, i);
1250 if (!ti->type->iterate_devices)
1252 ti->type->iterate_devices(ti, dm_keyslot_evict_callback,
1256 dm_put_live_table(md, srcu_idx);
1261 device_intersect_crypto_capabilities(struct dm_target *ti, struct dm_dev *dev,
1262 sector_t start, sector_t len, void *data)
1264 struct blk_crypto_profile *parent = data;
1265 struct blk_crypto_profile *child =
1266 bdev_get_queue(dev->bdev)->crypto_profile;
1268 blk_crypto_intersect_capabilities(parent, child);
1272 void dm_destroy_crypto_profile(struct blk_crypto_profile *profile)
1274 struct dm_crypto_profile *dmcp = container_of(profile,
1275 struct dm_crypto_profile,
1281 blk_crypto_profile_destroy(profile);
1285 static void dm_table_destroy_crypto_profile(struct dm_table *t)
1287 dm_destroy_crypto_profile(t->crypto_profile);
1288 t->crypto_profile = NULL;
1292 * Constructs and initializes t->crypto_profile with a crypto profile that
1293 * represents the common set of crypto capabilities of the devices described by
1294 * the dm_table. However, if the constructed crypto profile doesn't support all
1295 * crypto capabilities that are supported by the current mapped_device, it
1296 * returns an error instead, since we don't support removing crypto capabilities
1297 * on table changes. Finally, if the constructed crypto profile is "empty" (has
1298 * no crypto capabilities at all), it just sets t->crypto_profile to NULL.
1300 static int dm_table_construct_crypto_profile(struct dm_table *t)
1302 struct dm_crypto_profile *dmcp;
1303 struct blk_crypto_profile *profile;
1305 bool empty_profile = true;
1307 dmcp = kmalloc(sizeof(*dmcp), GFP_KERNEL);
1312 profile = &dmcp->profile;
1313 blk_crypto_profile_init(profile, 0);
1314 profile->ll_ops.keyslot_evict = dm_keyslot_evict;
1315 profile->max_dun_bytes_supported = UINT_MAX;
1316 memset(profile->modes_supported, 0xFF,
1317 sizeof(profile->modes_supported));
1319 for (i = 0; i < t->num_targets; i++) {
1320 struct dm_target *ti = dm_table_get_target(t, i);
1322 if (!dm_target_passes_crypto(ti->type)) {
1323 blk_crypto_intersect_capabilities(profile, NULL);
1326 if (!ti->type->iterate_devices)
1328 ti->type->iterate_devices(ti,
1329 device_intersect_crypto_capabilities,
1334 !blk_crypto_has_capabilities(profile,
1335 t->md->queue->crypto_profile)) {
1336 DMERR("Inline encryption capabilities of new DM table were more restrictive than the old table's. This is not supported!");
1337 dm_destroy_crypto_profile(profile);
1342 * If the new profile doesn't actually support any crypto capabilities,
1343 * we may as well represent it with a NULL profile.
1345 for (i = 0; i < ARRAY_SIZE(profile->modes_supported); i++) {
1346 if (profile->modes_supported[i]) {
1347 empty_profile = false;
1352 if (empty_profile) {
1353 dm_destroy_crypto_profile(profile);
1358 * t->crypto_profile is only set temporarily while the table is being
1359 * set up, and it gets set to NULL after the profile has been
1360 * transferred to the request_queue.
1362 t->crypto_profile = profile;
1367 static void dm_update_crypto_profile(struct request_queue *q,
1370 if (!t->crypto_profile)
1373 /* Make the crypto profile less restrictive. */
1374 if (!q->crypto_profile) {
1375 blk_crypto_register(t->crypto_profile, q);
1377 blk_crypto_update_capabilities(q->crypto_profile,
1379 dm_destroy_crypto_profile(t->crypto_profile);
1381 t->crypto_profile = NULL;
1384 #else /* CONFIG_BLK_INLINE_ENCRYPTION */
1386 static int dm_table_construct_crypto_profile(struct dm_table *t)
1391 void dm_destroy_crypto_profile(struct blk_crypto_profile *profile)
1395 static void dm_table_destroy_crypto_profile(struct dm_table *t)
1399 static void dm_update_crypto_profile(struct request_queue *q,
1404 #endif /* !CONFIG_BLK_INLINE_ENCRYPTION */
1407 * Prepares the table for use by building the indices,
1408 * setting the type, and allocating mempools.
1410 int dm_table_complete(struct dm_table *t)
1414 r = dm_table_determine_type(t);
1416 DMERR("unable to determine table type");
1420 r = dm_table_build_index(t);
1422 DMERR("unable to build btrees");
1426 r = dm_table_register_integrity(t);
1428 DMERR("could not register integrity profile.");
1432 r = dm_table_construct_crypto_profile(t);
1434 DMERR("could not construct crypto profile.");
1438 r = dm_table_alloc_md_mempools(t, t->md);
1440 DMERR("unable to allocate mempools");
1445 static DEFINE_MUTEX(_event_lock);
1446 void dm_table_event_callback(struct dm_table *t,
1447 void (*fn)(void *), void *context)
1449 mutex_lock(&_event_lock);
1451 t->event_context = context;
1452 mutex_unlock(&_event_lock);
1455 void dm_table_event(struct dm_table *t)
1457 mutex_lock(&_event_lock);
1459 t->event_fn(t->event_context);
1460 mutex_unlock(&_event_lock);
1462 EXPORT_SYMBOL(dm_table_event);
1464 inline sector_t dm_table_get_size(struct dm_table *t)
1466 return t->num_targets ? (t->highs[t->num_targets - 1] + 1) : 0;
1468 EXPORT_SYMBOL(dm_table_get_size);
1471 * Search the btree for the correct target.
1473 * Caller should check returned pointer for NULL
1474 * to trap I/O beyond end of device.
1476 struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector)
1478 unsigned int l, n = 0, k = 0;
1481 if (unlikely(sector >= dm_table_get_size(t)))
1484 for (l = 0; l < t->depth; l++) {
1485 n = get_child(n, k);
1486 node = get_node(t, l, n);
1488 for (k = 0; k < KEYS_PER_NODE; k++)
1489 if (node[k] >= sector)
1493 return &t->targets[(KEYS_PER_NODE * n) + k];
1496 static int device_not_poll_capable(struct dm_target *ti, struct dm_dev *dev,
1497 sector_t start, sector_t len, void *data)
1499 struct request_queue *q = bdev_get_queue(dev->bdev);
1501 return !test_bit(QUEUE_FLAG_POLL, &q->queue_flags);
1505 * type->iterate_devices() should be called when the sanity check needs to
1506 * iterate and check all underlying data devices. iterate_devices() will
1507 * iterate all underlying data devices until it encounters a non-zero return
1508 * code, returned by whether the input iterate_devices_callout_fn, or
1509 * iterate_devices() itself internally.
1511 * For some target type (e.g. dm-stripe), one call of iterate_devices() may
1512 * iterate multiple underlying devices internally, in which case a non-zero
1513 * return code returned by iterate_devices_callout_fn will stop the iteration
1516 * Cases requiring _any_ underlying device supporting some kind of attribute,
1517 * should use the iteration structure like dm_table_any_dev_attr(), or call
1518 * it directly. @func should handle semantics of positive examples, e.g.
1519 * capable of something.
1521 * Cases requiring _all_ underlying devices supporting some kind of attribute,
1522 * should use the iteration structure like dm_table_supports_nowait() or
1523 * dm_table_supports_discards(). Or introduce dm_table_all_devs_attr() that
1524 * uses an @anti_func that handle semantics of counter examples, e.g. not
1525 * capable of something. So: return !dm_table_any_dev_attr(t, anti_func, data);
1527 static bool dm_table_any_dev_attr(struct dm_table *t,
1528 iterate_devices_callout_fn func, void *data)
1530 for (unsigned int i = 0; i < t->num_targets; i++) {
1531 struct dm_target *ti = dm_table_get_target(t, i);
1533 if (ti->type->iterate_devices &&
1534 ti->type->iterate_devices(ti, func, data))
1541 static int count_device(struct dm_target *ti, struct dm_dev *dev,
1542 sector_t start, sector_t len, void *data)
1544 unsigned int *num_devices = data;
1551 static bool dm_table_supports_poll(struct dm_table *t)
1553 for (unsigned int i = 0; i < t->num_targets; i++) {
1554 struct dm_target *ti = dm_table_get_target(t, i);
1556 if (!ti->type->iterate_devices ||
1557 ti->type->iterate_devices(ti, device_not_poll_capable, NULL))
1565 * Check whether a table has no data devices attached using each
1566 * target's iterate_devices method.
1567 * Returns false if the result is unknown because a target doesn't
1568 * support iterate_devices.
1570 bool dm_table_has_no_data_devices(struct dm_table *t)
1572 for (unsigned int i = 0; i < t->num_targets; i++) {
1573 struct dm_target *ti = dm_table_get_target(t, i);
1574 unsigned int num_devices = 0;
1576 if (!ti->type->iterate_devices)
1579 ti->type->iterate_devices(ti, count_device, &num_devices);
1587 static int device_not_zoned(struct dm_target *ti, struct dm_dev *dev,
1588 sector_t start, sector_t len, void *data)
1592 return bdev_is_zoned(dev->bdev) != *zoned;
1595 static int device_is_zoned_model(struct dm_target *ti, struct dm_dev *dev,
1596 sector_t start, sector_t len, void *data)
1598 return bdev_is_zoned(dev->bdev);
1602 * Check the device zoned model based on the target feature flag. If the target
1603 * has the DM_TARGET_ZONED_HM feature flag set, host-managed zoned devices are
1604 * also accepted but all devices must have the same zoned model. If the target
1605 * has the DM_TARGET_MIXED_ZONED_MODEL feature set, the devices can have any
1606 * zoned model with all zoned devices having the same zone size.
1608 static bool dm_table_supports_zoned(struct dm_table *t, bool zoned)
1610 for (unsigned int i = 0; i < t->num_targets; i++) {
1611 struct dm_target *ti = dm_table_get_target(t, i);
1614 * For the wildcard target (dm-error), if we do not have a
1615 * backing device, we must always return false. If we have a
1616 * backing device, the result must depend on checking zoned
1617 * model, like for any other target. So for this, check directly
1618 * if the target backing device is zoned as we get "false" when
1619 * dm-error was set without a backing device.
1621 if (dm_target_is_wildcard(ti->type) &&
1622 !ti->type->iterate_devices(ti, device_is_zoned_model, NULL))
1625 if (dm_target_supports_zoned_hm(ti->type)) {
1626 if (!ti->type->iterate_devices ||
1627 ti->type->iterate_devices(ti, device_not_zoned,
1630 } else if (!dm_target_supports_mixed_zoned_model(ti->type)) {
1639 static int device_not_matches_zone_sectors(struct dm_target *ti, struct dm_dev *dev,
1640 sector_t start, sector_t len, void *data)
1642 unsigned int *zone_sectors = data;
1644 if (!bdev_is_zoned(dev->bdev))
1646 return bdev_zone_sectors(dev->bdev) != *zone_sectors;
1650 * Check consistency of zoned model and zone sectors across all targets. For
1651 * zone sectors, if the destination device is a zoned block device, it shall
1652 * have the specified zone_sectors.
1654 static int validate_hardware_zoned(struct dm_table *t, bool zoned,
1655 unsigned int zone_sectors)
1660 if (!dm_table_supports_zoned(t, zoned)) {
1661 DMERR("%s: zoned model is not consistent across all devices",
1662 dm_device_name(t->md));
1666 /* Check zone size validity and compatibility */
1667 if (!zone_sectors || !is_power_of_2(zone_sectors))
1670 if (dm_table_any_dev_attr(t, device_not_matches_zone_sectors, &zone_sectors)) {
1671 DMERR("%s: zone sectors is not consistent across all zoned devices",
1672 dm_device_name(t->md));
1680 * Establish the new table's queue_limits and validate them.
1682 int dm_calculate_queue_limits(struct dm_table *t,
1683 struct queue_limits *limits)
1685 struct queue_limits ti_limits;
1686 unsigned int zone_sectors = 0;
1689 blk_set_stacking_limits(limits);
1691 for (unsigned int i = 0; i < t->num_targets; i++) {
1692 struct dm_target *ti = dm_table_get_target(t, i);
1694 blk_set_stacking_limits(&ti_limits);
1696 if (!ti->type->iterate_devices) {
1697 /* Set I/O hints portion of queue limits */
1698 if (ti->type->io_hints)
1699 ti->type->io_hints(ti, &ti_limits);
1700 goto combine_limits;
1704 * Combine queue limits of all the devices this target uses.
1706 ti->type->iterate_devices(ti, dm_set_device_limits,
1709 if (!zoned && ti_limits.zoned) {
1711 * After stacking all limits, validate all devices
1712 * in table support this zoned model and zone sectors.
1714 zoned = ti_limits.zoned;
1715 zone_sectors = ti_limits.chunk_sectors;
1718 /* Set I/O hints portion of queue limits */
1719 if (ti->type->io_hints)
1720 ti->type->io_hints(ti, &ti_limits);
1723 * Check each device area is consistent with the target's
1724 * overall queue limits.
1726 if (ti->type->iterate_devices(ti, device_area_is_invalid,
1732 * Merge this target's queue limits into the overall limits
1735 if (blk_stack_limits(limits, &ti_limits, 0) < 0)
1736 DMWARN("%s: adding target device (start sect %llu len %llu) "
1737 "caused an alignment inconsistency",
1738 dm_device_name(t->md),
1739 (unsigned long long) ti->begin,
1740 (unsigned long long) ti->len);
1744 * Verify that the zoned model and zone sectors, as determined before
1745 * any .io_hints override, are the same across all devices in the table.
1746 * - this is especially relevant if .io_hints is emulating a disk-managed
1747 * zoned model on host-managed zoned block devices.
1750 if (limits->zoned) {
1752 * ...IF the above limits stacking determined a zoned model
1753 * validate that all of the table's devices conform to it.
1755 zoned = limits->zoned;
1756 zone_sectors = limits->chunk_sectors;
1758 if (validate_hardware_zoned(t, zoned, zone_sectors))
1761 return validate_hardware_logical_block_alignment(t, limits);
1765 * Verify that all devices have an integrity profile that matches the
1766 * DM device's registered integrity profile. If the profiles don't
1767 * match then unregister the DM device's integrity profile.
1769 static void dm_table_verify_integrity(struct dm_table *t)
1771 struct gendisk *template_disk = NULL;
1773 if (t->integrity_added)
1776 if (t->integrity_supported) {
1778 * Verify that the original integrity profile
1779 * matches all the devices in this table.
1781 template_disk = dm_table_get_integrity_disk(t);
1782 if (template_disk &&
1783 blk_integrity_compare(dm_disk(t->md), template_disk) >= 0)
1787 if (integrity_profile_exists(dm_disk(t->md))) {
1788 DMWARN("%s: unable to establish an integrity profile",
1789 dm_device_name(t->md));
1790 blk_integrity_unregister(dm_disk(t->md));
1794 static int device_flush_capable(struct dm_target *ti, struct dm_dev *dev,
1795 sector_t start, sector_t len, void *data)
1797 unsigned long flush = (unsigned long) data;
1798 struct request_queue *q = bdev_get_queue(dev->bdev);
1800 return (q->queue_flags & flush);
1803 static bool dm_table_supports_flush(struct dm_table *t, unsigned long flush)
1806 * Require at least one underlying device to support flushes.
1807 * t->devices includes internal dm devices such as mirror logs
1808 * so we need to use iterate_devices here, which targets
1809 * supporting flushes must provide.
1811 for (unsigned int i = 0; i < t->num_targets; i++) {
1812 struct dm_target *ti = dm_table_get_target(t, i);
1814 if (!ti->num_flush_bios)
1817 if (ti->flush_supported)
1820 if (ti->type->iterate_devices &&
1821 ti->type->iterate_devices(ti, device_flush_capable, (void *) flush))
1828 static int device_dax_write_cache_enabled(struct dm_target *ti,
1829 struct dm_dev *dev, sector_t start,
1830 sector_t len, void *data)
1832 struct dax_device *dax_dev = dev->dax_dev;
1837 if (dax_write_cache_enabled(dax_dev))
1842 static int device_is_rotational(struct dm_target *ti, struct dm_dev *dev,
1843 sector_t start, sector_t len, void *data)
1845 return !bdev_nonrot(dev->bdev);
1848 static int device_is_not_random(struct dm_target *ti, struct dm_dev *dev,
1849 sector_t start, sector_t len, void *data)
1851 struct request_queue *q = bdev_get_queue(dev->bdev);
1853 return !blk_queue_add_random(q);
1856 static int device_not_write_zeroes_capable(struct dm_target *ti, struct dm_dev *dev,
1857 sector_t start, sector_t len, void *data)
1859 struct request_queue *q = bdev_get_queue(dev->bdev);
1861 return !q->limits.max_write_zeroes_sectors;
1864 static bool dm_table_supports_write_zeroes(struct dm_table *t)
1866 for (unsigned int i = 0; i < t->num_targets; i++) {
1867 struct dm_target *ti = dm_table_get_target(t, i);
1869 if (!ti->num_write_zeroes_bios)
1872 if (!ti->type->iterate_devices ||
1873 ti->type->iterate_devices(ti, device_not_write_zeroes_capable, NULL))
1880 static int device_not_nowait_capable(struct dm_target *ti, struct dm_dev *dev,
1881 sector_t start, sector_t len, void *data)
1883 return !bdev_nowait(dev->bdev);
1886 static bool dm_table_supports_nowait(struct dm_table *t)
1888 for (unsigned int i = 0; i < t->num_targets; i++) {
1889 struct dm_target *ti = dm_table_get_target(t, i);
1891 if (!dm_target_supports_nowait(ti->type))
1894 if (!ti->type->iterate_devices ||
1895 ti->type->iterate_devices(ti, device_not_nowait_capable, NULL))
1902 static int device_not_discard_capable(struct dm_target *ti, struct dm_dev *dev,
1903 sector_t start, sector_t len, void *data)
1905 return !bdev_max_discard_sectors(dev->bdev);
1908 static bool dm_table_supports_discards(struct dm_table *t)
1910 for (unsigned int i = 0; i < t->num_targets; i++) {
1911 struct dm_target *ti = dm_table_get_target(t, i);
1913 if (!ti->num_discard_bios)
1917 * Either the target provides discard support (as implied by setting
1918 * 'discards_supported') or it relies on _all_ data devices having
1921 if (!ti->discards_supported &&
1922 (!ti->type->iterate_devices ||
1923 ti->type->iterate_devices(ti, device_not_discard_capable, NULL)))
1930 static int device_not_secure_erase_capable(struct dm_target *ti,
1931 struct dm_dev *dev, sector_t start,
1932 sector_t len, void *data)
1934 return !bdev_max_secure_erase_sectors(dev->bdev);
1937 static bool dm_table_supports_secure_erase(struct dm_table *t)
1939 for (unsigned int i = 0; i < t->num_targets; i++) {
1940 struct dm_target *ti = dm_table_get_target(t, i);
1942 if (!ti->num_secure_erase_bios)
1945 if (!ti->type->iterate_devices ||
1946 ti->type->iterate_devices(ti, device_not_secure_erase_capable, NULL))
1953 static int device_requires_stable_pages(struct dm_target *ti,
1954 struct dm_dev *dev, sector_t start,
1955 sector_t len, void *data)
1957 return bdev_stable_writes(dev->bdev);
1960 int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
1961 struct queue_limits *limits)
1963 bool wc = false, fua = false;
1967 * Copy table's limits to the DM device's request_queue
1969 q->limits = *limits;
1971 if (dm_table_supports_nowait(t))
1972 blk_queue_flag_set(QUEUE_FLAG_NOWAIT, q);
1974 blk_queue_flag_clear(QUEUE_FLAG_NOWAIT, q);
1976 if (!dm_table_supports_discards(t)) {
1977 q->limits.max_discard_sectors = 0;
1978 q->limits.max_hw_discard_sectors = 0;
1979 q->limits.discard_granularity = 0;
1980 q->limits.discard_alignment = 0;
1981 q->limits.discard_misaligned = 0;
1984 if (!dm_table_supports_secure_erase(t))
1985 q->limits.max_secure_erase_sectors = 0;
1987 if (dm_table_supports_flush(t, (1UL << QUEUE_FLAG_WC))) {
1989 if (dm_table_supports_flush(t, (1UL << QUEUE_FLAG_FUA)))
1992 blk_queue_write_cache(q, wc, fua);
1994 if (dm_table_supports_dax(t, device_not_dax_capable)) {
1995 blk_queue_flag_set(QUEUE_FLAG_DAX, q);
1996 if (dm_table_supports_dax(t, device_not_dax_synchronous_capable))
1997 set_dax_synchronous(t->md->dax_dev);
1999 blk_queue_flag_clear(QUEUE_FLAG_DAX, q);
2001 if (dm_table_any_dev_attr(t, device_dax_write_cache_enabled, NULL))
2002 dax_write_cache(t->md->dax_dev, true);
2004 /* Ensure that all underlying devices are non-rotational. */
2005 if (dm_table_any_dev_attr(t, device_is_rotational, NULL))
2006 blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
2008 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
2010 if (!dm_table_supports_write_zeroes(t))
2011 q->limits.max_write_zeroes_sectors = 0;
2013 dm_table_verify_integrity(t);
2016 * Some devices don't use blk_integrity but still want stable pages
2017 * because they do their own checksumming.
2018 * If any underlying device requires stable pages, a table must require
2019 * them as well. Only targets that support iterate_devices are considered:
2020 * don't want error, zero, etc to require stable pages.
2022 if (dm_table_any_dev_attr(t, device_requires_stable_pages, NULL))
2023 blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, q);
2025 blk_queue_flag_clear(QUEUE_FLAG_STABLE_WRITES, q);
2028 * Determine whether or not this queue's I/O timings contribute
2029 * to the entropy pool, Only request-based targets use this.
2030 * Clear QUEUE_FLAG_ADD_RANDOM if any underlying device does not
2033 if (blk_queue_add_random(q) &&
2034 dm_table_any_dev_attr(t, device_is_not_random, NULL))
2035 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
2038 * For a zoned target, setup the zones related queue attributes
2039 * and resources necessary for zone append emulation if necessary.
2041 if (blk_queue_is_zoned(q)) {
2042 r = dm_set_zones_restrictions(t, q);
2045 if (!static_key_enabled(&zoned_enabled.key))
2046 static_branch_enable(&zoned_enabled);
2049 dm_update_crypto_profile(q, t);
2050 disk_update_readahead(t->md->disk);
2053 * Check for request-based device is left to
2054 * dm_mq_init_request_queue()->blk_mq_init_allocated_queue().
2056 * For bio-based device, only set QUEUE_FLAG_POLL when all
2057 * underlying devices supporting polling.
2059 if (__table_type_bio_based(t->type)) {
2060 if (dm_table_supports_poll(t))
2061 blk_queue_flag_set(QUEUE_FLAG_POLL, q);
2063 blk_queue_flag_clear(QUEUE_FLAG_POLL, q);
2069 struct list_head *dm_table_get_devices(struct dm_table *t)
2074 blk_mode_t dm_table_get_mode(struct dm_table *t)
2078 EXPORT_SYMBOL(dm_table_get_mode);
2086 static void suspend_targets(struct dm_table *t, enum suspend_mode mode)
2088 lockdep_assert_held(&t->md->suspend_lock);
2090 for (unsigned int i = 0; i < t->num_targets; i++) {
2091 struct dm_target *ti = dm_table_get_target(t, i);
2095 if (ti->type->presuspend)
2096 ti->type->presuspend(ti);
2098 case PRESUSPEND_UNDO:
2099 if (ti->type->presuspend_undo)
2100 ti->type->presuspend_undo(ti);
2103 if (ti->type->postsuspend)
2104 ti->type->postsuspend(ti);
2110 void dm_table_presuspend_targets(struct dm_table *t)
2115 suspend_targets(t, PRESUSPEND);
2118 void dm_table_presuspend_undo_targets(struct dm_table *t)
2123 suspend_targets(t, PRESUSPEND_UNDO);
2126 void dm_table_postsuspend_targets(struct dm_table *t)
2131 suspend_targets(t, POSTSUSPEND);
2134 int dm_table_resume_targets(struct dm_table *t)
2139 lockdep_assert_held(&t->md->suspend_lock);
2141 for (i = 0; i < t->num_targets; i++) {
2142 struct dm_target *ti = dm_table_get_target(t, i);
2144 if (!ti->type->preresume)
2147 r = ti->type->preresume(ti);
2149 DMERR("%s: %s: preresume failed, error = %d",
2150 dm_device_name(t->md), ti->type->name, r);
2155 for (i = 0; i < t->num_targets; i++) {
2156 struct dm_target *ti = dm_table_get_target(t, i);
2158 if (ti->type->resume)
2159 ti->type->resume(ti);
2165 struct mapped_device *dm_table_get_md(struct dm_table *t)
2169 EXPORT_SYMBOL(dm_table_get_md);
2171 const char *dm_table_device_name(struct dm_table *t)
2173 return dm_device_name(t->md);
2175 EXPORT_SYMBOL_GPL(dm_table_device_name);
2177 void dm_table_run_md_queue_async(struct dm_table *t)
2179 if (!dm_table_request_based(t))
2183 blk_mq_run_hw_queues(t->md->queue, true);
2185 EXPORT_SYMBOL(dm_table_run_md_queue_async);