60 static inline sector_t *get_node(struct dm_table *t,  in get_node()  argument
63 	return t->index[l] + (n * KEYS_PER_NODE);  in get_node()
70 static sector_t high(struct dm_table *t, unsigned int l, unsigned int n)  in high()  argument
72 	for (; l < t->depth - 1; l++)  in high()
75 	if (n >= t->counts[l])  in high()
78 	return get_node(t, l, n)[KEYS_PER_NODE - 1];  in high()
85 static int setup_btree_index(unsigned int l, struct dm_table *t)  in setup_btree_index()  argument
90 	for (n = 0U; n < t->counts[l]; n++) {  in setup_btree_index()
91 		node = get_node(t, l, n);  in setup_btree_index()
94 			node[k] = high(t, l + 1, get_child(n, k));  in setup_btree_index()
104 static int alloc_targets(struct dm_table *t, unsigned int num)  in alloc_targets()  argument
121 	t->num_allocated = num;  in alloc_targets()
122 	t->highs = n_highs;  in alloc_targets()
123 	t->targets = n_targets;  in alloc_targets()
131 	struct dm_table *t;  in dm_table_create()  local
136 	t = kzalloc_obj(*t);  in dm_table_create()
138 	if (!t)  in dm_table_create()
141 	INIT_LIST_HEAD(&t->devices);  in dm_table_create()
149 		kfree(t);  in dm_table_create()
153 	if (alloc_targets(t, num_targets)) {  in dm_table_create()
154 		kfree(t);  in dm_table_create()
158 	t->type = DM_TYPE_NONE;  in dm_table_create()
159 	t->mode = mode;  in dm_table_create()
160 	t->md = md;  in dm_table_create()
161 	t->flush_bypasses_map = true;  in dm_table_create()
162 	*result = t;  in dm_table_create()
180 static void dm_table_destroy_crypto_profile(struct dm_table *t);
182 void dm_table_destroy(struct dm_table *t)  in dm_table_destroy()  argument
184 	if (!t)  in dm_table_destroy()
188 	if (t->depth >= 2)  in dm_table_destroy()
189 		kvfree(t->index[t->depth - 2]);  in dm_table_destroy()
192 	for (unsigned int i = 0; i < t->num_targets; i++) {  in dm_table_destroy()
193 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_table_destroy()
201 	kvfree(t->highs);  in dm_table_destroy()
204 	free_devices(&t->devices, t->md);  in dm_table_destroy()
206 	dm_free_md_mempools(t->mempools);  in dm_table_destroy()
208 	dm_table_destroy_crypto_profile(t);  in dm_table_destroy()
210 	kfree(t);  in dm_table_destroy()
371 	struct dm_table *t = ti->table;  in dm_get_device()  local
373 	BUG_ON(!t);  in dm_get_device()
379 	if (dev == disk_devt(t->md->disk))  in dm_get_device()
382 	dd = find_device(&t->devices, dev);  in dm_get_device()
388 		r = dm_get_table_device(t->md, dev, mode, &dd->dm_dev);  in dm_get_device()
395 		list_add(&dd->list, &t->devices);  in dm_get_device()
399 		r = upgrade_mode(dd, mode, t->md);  in dm_get_device()
482 static int adjoin(struct dm_table *t, struct dm_target *ti)  in adjoin()  argument
486 	if (!t->num_targets)  in adjoin()
489 	prev = &t->targets[t->num_targets - 1];  in adjoin()
603 static int validate_hardware_logical_block_alignment(struct dm_table *t,  in validate_hardware_logical_block_alignment()  argument
631 	for (i = 0; i < t->num_targets; i++) {  in validate_hardware_logical_block_alignment()
632 		ti = dm_table_get_target(t, i);  in validate_hardware_logical_block_alignment()
660 		      dm_device_name(t->md), i,  in validate_hardware_logical_block_alignment()
670 int dm_table_add_target(struct dm_table *t, const char *type,  in dm_table_add_target()  argument
677 	if (t->singleton) {  in dm_table_add_target()
679 		      dm_device_name(t->md), t->targets->type->name);  in dm_table_add_target()
683 	BUG_ON(t->num_targets >= t->num_allocated);  in dm_table_add_target()
685 	ti = t->targets + t->num_targets;  in dm_table_add_target()
689 		DMERR("%s: zero-length target", dm_device_name(t->md));  in dm_table_add_target()
693 		DMERR("%s: too large device", dm_device_name(t->md));  in dm_table_add_target()
699 		DMERR("%s: %s: unknown target type", dm_device_name(t->md), type);  in dm_table_add_target()
704 		if (t->num_targets) {  in dm_table_add_target()
708 		t->singleton = true;  in dm_table_add_target()
712 	    !(t->mode & BLK_OPEN_WRITE)) {  in dm_table_add_target()
717 	if (t->immutable_target_type) {  in dm_table_add_target()
718 		if (t->immutable_target_type != ti->type) {  in dm_table_add_target()
723 		if (t->num_targets) {  in dm_table_add_target()
727 		t->immutable_target_type = ti->type;  in dm_table_add_target()
730 	ti->table = t;  in dm_table_add_target()
738 	if (!adjoin(t, ti)) {  in dm_table_add_target()
754 	t->highs[t->num_targets++] = ti->begin + ti->len - 1;  in dm_table_add_target()
758 		       dm_device_name(t->md), type);  in dm_table_add_target()
764 		t->flush_bypasses_map = false;  in dm_table_add_target()
769 	DMERR("%s: %s: %s (%pe)", dm_device_name(t->md), type, ti->error, ERR_PTR(r));  in dm_table_add_target()
843 void dm_table_set_type(struct dm_table *t, enum dm_queue_mode type)  in dm_table_set_type()  argument
845 	t->type = type;  in dm_table_set_type()
867 static bool dm_table_supports_dax(struct dm_table *t,  in dm_table_supports_dax()  argument
871 	for (unsigned int i = 0; i < t->num_targets; i++) {  in dm_table_supports_dax()
872 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_table_supports_dax()
899 static int dm_table_determine_type(struct dm_table *t)  in dm_table_determine_type()  argument
903 	struct list_head *devices = dm_table_get_devices(t);  in dm_table_determine_type()
904 	enum dm_queue_mode live_md_type = dm_get_md_type(t->md);  in dm_table_determine_type()
906 	if (t->type != DM_TYPE_NONE) {  in dm_table_determine_type()
908 		if (t->type == DM_TYPE_BIO_BASED) {  in dm_table_determine_type()
912 		BUG_ON(t->type == DM_TYPE_DAX_BIO_BASED);  in dm_table_determine_type()
916 	for (unsigned int i = 0; i < t->num_targets; i++) {  in dm_table_determine_type()
917 		ti = dm_table_get_target(t, i);  in dm_table_determine_type()
946 		t->type = DM_TYPE_BIO_BASED;  in dm_table_determine_type()
947 		if (dm_table_supports_dax(t, device_not_dax_capable) ||  in dm_table_determine_type()
949 			t->type = DM_TYPE_DAX_BIO_BASED;  in dm_table_determine_type()
956 	t->type = DM_TYPE_REQUEST_BASED;  in dm_table_determine_type()
965 	if (t->num_targets > 1) {  in dm_table_determine_type()
972 		struct dm_table *live_table = dm_get_live_table(t->md, &srcu_idx);  in dm_table_determine_type()
976 			t->type = live_table->type;  in dm_table_determine_type()
977 		dm_put_live_table(t->md, srcu_idx);  in dm_table_determine_type()
981 	ti = dm_table_get_immutable_target(t);  in dm_table_determine_type()
1000 enum dm_queue_mode dm_table_get_type(struct dm_table *t)  in dm_table_get_type()  argument
1002 	return t->type;  in dm_table_get_type()
1005 struct target_type *dm_table_get_immutable_target_type(struct dm_table *t)  in dm_table_get_immutable_target_type()  argument
1007 	return t->immutable_target_type;  in dm_table_get_immutable_target_type()
1010 struct dm_target *dm_table_get_immutable_target(struct dm_table *t)  in dm_table_get_immutable_target()  argument
1013 	if (t->num_targets > 1 ||  in dm_table_get_immutable_target()
1014 	    !dm_target_is_immutable(t->targets[0].type))  in dm_table_get_immutable_target()
1017 	return t->targets;  in dm_table_get_immutable_target()
1020 struct dm_target *dm_table_get_wildcard_target(struct dm_table *t)  in dm_table_get_wildcard_target()  argument
1022 	for (unsigned int i = 0; i < t->num_targets; i++) {  in dm_table_get_wildcard_target()
1023 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_table_get_wildcard_target()
1032 bool dm_table_request_based(struct dm_table *t)  in dm_table_request_based()  argument
1034 	return __table_type_request_based(dm_table_get_type(t));  in dm_table_request_based()
1037 static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *md)  in dm_table_alloc_md_mempools()  argument
1039 	enum dm_queue_mode type = dm_table_get_type(t);  in dm_table_alloc_md_mempools()
1063 	for (unsigned int i = 0; i < t->num_targets; i++) {  in dm_table_alloc_md_mempools()
1064 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_table_alloc_md_mempools()
1081 	t->mempools = pools;  in dm_table_alloc_md_mempools()
1089 static int setup_indexes(struct dm_table *t)  in setup_indexes()  argument
1096 	for (i = t->depth - 2; i >= 0; i--) {  in setup_indexes()
1097 		t->counts[i] = dm_div_up(t->counts[i + 1], CHILDREN_PER_NODE);  in setup_indexes()
1098 		total += t->counts[i];  in setup_indexes()
1106 	for (i = t->depth - 2; i >= 0; i--) {  in setup_indexes()
1107 		t->index[i] = indexes;  in setup_indexes()
1108 		indexes += (KEYS_PER_NODE * t->counts[i]);  in setup_indexes()
1109 		setup_btree_index(i, t);  in setup_indexes()
1118 static int dm_table_build_index(struct dm_table *t)  in dm_table_build_index()  argument
1124 	leaf_nodes = dm_div_up(t->num_targets, KEYS_PER_NODE);  in dm_table_build_index()
1125 	t->depth = 1 + int_log(leaf_nodes, CHILDREN_PER_NODE);  in dm_table_build_index()
1128 	t->counts[t->depth - 1] = leaf_nodes;  in dm_table_build_index()
1129 	t->index[t->depth - 1] = t->highs;  in dm_table_build_index()
1131 	if (t->depth >= 2)  in dm_table_build_index()
1132 		r = setup_indexes(t);  in dm_table_build_index()
1162 	struct dm_table *t;  in dm_keyslot_evict()  local
1165 	t = dm_get_live_table(md, &srcu_idx);  in dm_keyslot_evict()
1166 	if (!t)  in dm_keyslot_evict()
1169 	for (unsigned int i = 0; i < t->num_targets; i++) {  in dm_keyslot_evict()
1170 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_keyslot_evict()
1259 	struct dm_table *t;  in dm_exec_wrappedkey_op()  local
1265 	t = dm_get_live_table(md, &srcu_idx);  in dm_exec_wrappedkey_op()
1266 	if (!t)  in dm_exec_wrappedkey_op()
1278 	for (i = 0; i < t->num_targets; i++) {  in dm_exec_wrappedkey_op()
1279 		ti = dm_table_get_target(t, i);  in dm_exec_wrappedkey_op()
1372 static void dm_table_destroy_crypto_profile(struct dm_table *t)  in dm_table_destroy_crypto_profile()  argument
1374 	dm_destroy_crypto_profile(t->crypto_profile);  in dm_table_destroy_crypto_profile()
1375 	t->crypto_profile = NULL;  in dm_table_destroy_crypto_profile()
1387 static int dm_table_construct_crypto_profile(struct dm_table *t)  in dm_table_construct_crypto_profile()  argument
1397 	dmcp->md = t->md;  in dm_table_construct_crypto_profile()
1407 	for (i = 0; i < t->num_targets; i++) {  in dm_table_construct_crypto_profile()
1408 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_table_construct_crypto_profile()
1428 	if (t->md->queue &&  in dm_table_construct_crypto_profile()
1430 					 t->md->queue->crypto_profile)) {  in dm_table_construct_crypto_profile()
1457 	t->crypto_profile = profile;  in dm_table_construct_crypto_profile()
1463 				     struct dm_table *t)  in dm_update_crypto_profile()  argument
1465 	if (!t->crypto_profile)  in dm_update_crypto_profile()
1470 		blk_crypto_register(t->crypto_profile, q);  in dm_update_crypto_profile()
1473 					       t->crypto_profile);  in dm_update_crypto_profile()
1474 		dm_destroy_crypto_profile(t->crypto_profile);  in dm_update_crypto_profile()
1476 	t->crypto_profile = NULL;  in dm_update_crypto_profile()
1481 static int dm_table_construct_crypto_profile(struct dm_table *t)  in dm_table_construct_crypto_profile()  argument
1490 static void dm_table_destroy_crypto_profile(struct dm_table *t)  in dm_table_destroy_crypto_profile()  argument
1495 				     struct dm_table *t)  in dm_update_crypto_profile()  argument
1505 int dm_table_complete(struct dm_table *t)  in dm_table_complete()  argument
1509 	r = dm_table_determine_type(t);  in dm_table_complete()
1515 	r = dm_table_build_index(t);  in dm_table_complete()
1521 	r = dm_table_construct_crypto_profile(t);  in dm_table_complete()
1527 	r = dm_table_alloc_md_mempools(t, t->md);  in dm_table_complete()
1535 void dm_table_event_callback(struct dm_table *t,  in dm_table_event_callback()  argument
1539 	t->event_fn = fn;  in dm_table_event_callback()
1540 	t->event_context = context;  in dm_table_event_callback()
1544 void dm_table_event(struct dm_table *t)  in dm_table_event()  argument
1547 	if (t->event_fn)  in dm_table_event()
1548 		t->event_fn(t->event_context);  in dm_table_event()
1553 inline sector_t dm_table_get_size(struct dm_table *t)  in dm_table_get_size()  argument
1555 	return t->num_targets ? (t->highs[t->num_targets - 1] + 1) : 0;  in dm_table_get_size()
1565 struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector)  in dm_table_find_target()  argument
1570 	if (unlikely(sector >= dm_table_get_size(t)))  in dm_table_find_target()
1573 	for (l = 0; l < t->depth; l++) {  in dm_table_find_target()
1575 		node = get_node(t, l, n);  in dm_table_find_target()
1582 	return &t->targets[(KEYS_PER_NODE * n) + k];  in dm_table_find_target()
1608 static bool dm_table_any_dev_attr(struct dm_table *t,  in dm_table_any_dev_attr()  argument
1611 	for (unsigned int i = 0; i < t->num_targets; i++) {  in dm_table_any_dev_attr()
1612 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_table_any_dev_attr()
1638 bool dm_table_has_no_data_devices(struct dm_table *t)  in dm_table_has_no_data_devices()  argument
1640 	for (unsigned int i = 0; i < t->num_targets; i++) {  in dm_table_has_no_data_devices()
1641 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_table_has_no_data_devices()
1655 bool dm_table_is_wildcard(struct dm_table *t)  in dm_table_is_wildcard()  argument
1657 	for (unsigned int i = 0; i < t->num_targets; i++) {  in dm_table_is_wildcard()
1658 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_table_is_wildcard()
1688 static bool dm_table_supports_zoned(struct dm_table *t, bool zoned)  in dm_table_supports_zoned()  argument
1690 	for (unsigned int i = 0; i < t->num_targets; i++) {  in dm_table_supports_zoned()
1691 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_table_supports_zoned()
1734 static int validate_hardware_zoned(struct dm_table *t, bool zoned,  in validate_hardware_zoned()  argument
1740 	if (!dm_table_supports_zoned(t, zoned)) {  in validate_hardware_zoned()
1742 		      dm_device_name(t->md));  in validate_hardware_zoned()
1750 	if (dm_table_any_dev_attr(t, device_not_matches_zone_sectors, &zone_sectors)) {  in validate_hardware_zoned()
1752 		      dm_device_name(t->md));  in validate_hardware_zoned()
1762 int dm_calculate_queue_limits(struct dm_table *t,  in dm_calculate_queue_limits()  argument
1771 	t->integrity_supported = true;  in dm_calculate_queue_limits()
1772 	for (unsigned int i = 0; i < t->num_targets; i++) {  in dm_calculate_queue_limits()
1773 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_calculate_queue_limits()
1776 			t->integrity_supported = false;  in dm_calculate_queue_limits()
1779 	for (unsigned int i = 0; i < t->num_targets; i++) {  in dm_calculate_queue_limits()
1780 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_calculate_queue_limits()
1826 			       dm_device_name(t->md),  in dm_calculate_queue_limits()
1830 		if (t->integrity_supported ||  in dm_calculate_queue_limits()
1835 				       dm_device_name(t->md),  in dm_calculate_queue_limits()
1838 				t->integrity_supported = false;  in dm_calculate_queue_limits()
1858 	if (validate_hardware_zoned(t, zoned, zone_sectors))  in dm_calculate_queue_limits()
1861 	return validate_hardware_logical_block_alignment(t, limits);  in dm_calculate_queue_limits()
1868 static bool dm_table_supports_flush(struct dm_table *t)  in dm_table_supports_flush()  argument
1870 	for (unsigned int i = 0; i < t->num_targets; i++) {  in dm_table_supports_flush()
1871 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_table_supports_flush()
1906 static bool dm_table_supports_write_zeroes(struct dm_table *t)  in dm_table_supports_write_zeroes()  argument
1908 	for (unsigned int i = 0; i < t->num_targets; i++) {  in dm_table_supports_write_zeroes()
1909 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_table_supports_write_zeroes()
1922 static bool dm_table_supports_nowait(struct dm_table *t)  in dm_table_supports_nowait()  argument
1924 	for (unsigned int i = 0; i < t->num_targets; i++) {  in dm_table_supports_nowait()
1925 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_table_supports_nowait()
1940 static bool dm_table_supports_discards(struct dm_table *t)  in dm_table_supports_discards()  argument
1942 	for (unsigned int i = 0; i < t->num_targets; i++) {  in dm_table_supports_discards()
1943 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_table_supports_discards()
1969 static bool dm_table_supports_secure_erase(struct dm_table *t)  in dm_table_supports_secure_erase()  argument
1971 	for (unsigned int i = 0; i < t->num_targets; i++) {  in dm_table_supports_secure_erase()
1972 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_table_supports_secure_erase()
1992 static bool dm_table_supports_atomic_writes(struct dm_table *t)  in dm_table_supports_atomic_writes()  argument
1994 	for (unsigned int i = 0; i < t->num_targets; i++) {  in dm_table_supports_atomic_writes()
1995 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_table_supports_atomic_writes()
2011 bool dm_table_supports_size_change(struct dm_table *t, sector_t old_size,  in dm_table_supports_size_change()  argument
2014 	if (IS_ENABLED(CONFIG_BLK_DEV_ZONED) && dm_has_zone_plugs(t->md) &&  in dm_table_supports_size_change()
2018 		       dm_device_name(t->md));  in dm_table_supports_size_change()
2028 int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,  in dm_table_set_restrictions()  argument
2034 	if (!dm_table_supports_nowait(t))  in dm_table_set_restrictions()
2041 	if (!__table_type_bio_based(t->type))  in dm_table_set_restrictions()
2044 	if (!dm_table_supports_discards(t)) {  in dm_table_set_restrictions()
2050 	if (!dm_table_supports_write_zeroes(t)) {  in dm_table_set_restrictions()
2055 	if (!dm_table_supports_secure_erase(t))  in dm_table_set_restrictions()
2058 	if (dm_table_supports_flush(t))  in dm_table_set_restrictions()
2061 	if (dm_table_supports_dax(t, device_not_dax_capable))  in dm_table_set_restrictions()
2069 			r = dm_set_zones_restrictions(t, q, limits);  in dm_table_set_restrictions()
2072 		} else if (dm_has_zone_plugs(t->md)) {  in dm_table_set_restrictions()
2075 			       dm_device_name(t->md));  in dm_table_set_restrictions()
2080 	if (dm_table_supports_atomic_writes(t))  in dm_table_set_restrictions()
2094 		r = dm_revalidate_zones(t, q);  in dm_table_set_restrictions()
2102 		dm_finalize_zone_settings(t, limits);  in dm_table_set_restrictions()
2104 	if (dm_table_supports_dax(t, device_not_dax_synchronous_capable))  in dm_table_set_restrictions()
2105 		set_dax_synchronous(t->md->dax_dev);  in dm_table_set_restrictions()
2107 	if (dm_table_any_dev_attr(t, device_dax_write_cache_enabled, NULL))  in dm_table_set_restrictions()
2108 		dax_write_cache(t->md->dax_dev, true);  in dm_table_set_restrictions()
2110 	dm_update_crypto_profile(q, t);  in dm_table_set_restrictions()
2114 struct list_head *dm_table_get_devices(struct dm_table *t)  in dm_table_get_devices()  argument
2116 	return &t->devices;  in dm_table_get_devices()
2119 blk_mode_t dm_table_get_mode(struct dm_table *t)  in dm_table_get_mode()  argument
2121 	return t->mode;  in dm_table_get_mode()
2131 static void suspend_targets(struct dm_table *t, enum suspend_mode mode)  in suspend_targets()  argument
2133 	lockdep_assert_held(&t->md->suspend_lock);  in suspend_targets()
2135 	for (unsigned int i = 0; i < t->num_targets; i++) {  in suspend_targets()
2136 		struct dm_target *ti = dm_table_get_target(t, i);  in suspend_targets()
2155 void dm_table_presuspend_targets(struct dm_table *t)  in dm_table_presuspend_targets()  argument
2157 	if (!t)  in dm_table_presuspend_targets()
2160 	suspend_targets(t, PRESUSPEND);  in dm_table_presuspend_targets()
2163 void dm_table_presuspend_undo_targets(struct dm_table *t)  in dm_table_presuspend_undo_targets()  argument
2165 	if (!t)  in dm_table_presuspend_undo_targets()
2168 	suspend_targets(t, PRESUSPEND_UNDO);  in dm_table_presuspend_undo_targets()
2171 void dm_table_postsuspend_targets(struct dm_table *t)  in dm_table_postsuspend_targets()  argument
2173 	if (!t)  in dm_table_postsuspend_targets()
2176 	suspend_targets(t, POSTSUSPEND);  in dm_table_postsuspend_targets()
2179 int dm_table_resume_targets(struct dm_table *t)  in dm_table_resume_targets()  argument
2184 	lockdep_assert_held(&t->md->suspend_lock);  in dm_table_resume_targets()
2186 	for (i = 0; i < t->num_targets; i++) {  in dm_table_resume_targets()
2187 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_table_resume_targets()
2195 			      dm_device_name(t->md), ti->type->name, r);  in dm_table_resume_targets()
2200 	for (i = 0; i < t->num_targets; i++) {  in dm_table_resume_targets()
2201 		struct dm_target *ti = dm_table_get_target(t, i);  in dm_table_resume_targets()
2210 struct mapped_device *dm_table_get_md(struct dm_table *t)  in dm_table_get_md()  argument
2212 	return t->md;  in dm_table_get_md()
2216 const char *dm_table_device_name(struct dm_table *t)  in dm_table_device_name()  argument
2218 	return dm_device_name(t->md);  in dm_table_device_name()
2222 void dm_table_run_md_queue_async(struct dm_table *t)  in dm_table_run_md_queue_async()  argument
2224 	if (!dm_table_request_based(t))  in dm_table_run_md_queue_async()
2227 	if (t->md->queue)  in dm_table_run_md_queue_async()
2228 		blk_mq_run_hw_queues(t->md->queue, true);  in dm_table_run_md_queue_async()