Merge tag 'for-6.1/dm-changes-v2' of...

Merge tag 'for-6.1/dm-changes-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper updates from Mike Snitzer:

 - Fix dm-bufio to use test_bit_acquire to properly test_bit on arches
   with weaker memory ordering.

 - DM core replace DMWARN with DMERR or DMCRIT for fatal errors.

 - Enable WQ_HIGHPRI on DM verity target's verify_wq.

 - Add documentation for DM verity's try_verify_in_tasklet option.

 - Various typo and redundant word fixes in code and/or comments.

* tag 'for-6.1/dm-changes-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm clone: Fix typo in block_device format specifier
  dm: remove unnecessary assignment statement in alloc_dev()
  dm verity: Add documentation for try_verify_in_tasklet option
  dm cache: delete the redundant word 'each' in comment
  dm raid: fix typo in analyse_superblocks code comment
  dm verity: enable WQ_HIGHPRI on verify_wq
  dm raid: delete the redundant word 'that' in comment
  dm: change from DMWARN to DMERR or DMCRIT for fatal errors
  dm bufio: use the acquire memory barrier when testing for B_READING

Documentation/admin-guide/device-mapper/verity.rst

@@ -141,6 +141,10 @@ root_hash_sig_key_desc <key_description>
     also gain new certificates at run time if they are signed by a certificate
     already in the secondary trusted keyring.
 
+try_verify_in_tasklet
+    If verity hashes are in cache, verify data blocks in kernel tasklet instead
+    of workqueue. This option can reduce IO latency.
+
 Theory of operation
 ===================
 

drivers/md/dm-bufio.c

@@ -795,7 +795,8 @@ static void __make_buffer_clean(struct dm_buffer *b)
 {
 	BUG_ON(b->hold_count);
 
-	if (!b->state)	/* fast case */
+	/* smp_load_acquire() pairs with read_endio()'s smp_mb__before_atomic() */
+	if (!smp_load_acquire(&b->state))	/* fast case */
 		return;
 
 	wait_on_bit_io(&b->state, B_READING, TASK_UNINTERRUPTIBLE);
@@ -816,7 +817,7 @@ static struct dm_buffer *__get_unclaimed_buffer(struct dm_bufio_client *c)
 		BUG_ON(test_bit(B_DIRTY, &b->state));
 
 		if (static_branch_unlikely(&no_sleep_enabled) && c->no_sleep &&
-		    unlikely(test_bit(B_READING, &b->state)))
+		    unlikely(test_bit_acquire(B_READING, &b->state)))
 			continue;
 
 		if (!b->hold_count) {
@@ -1058,7 +1059,7 @@ static struct dm_buffer *__bufio_new(struct dm_bufio_client *c, sector_t block,
 	 * If the user called both dm_bufio_prefetch and dm_bufio_get on
 	 * the same buffer, it would deadlock if we waited.
 	 */
-	if (nf == NF_GET && unlikely(test_bit(B_READING, &b->state)))
+	if (nf == NF_GET && unlikely(test_bit_acquire(B_READING, &b->state)))
 		return NULL;
 
 	b->hold_count++;
@@ -1218,7 +1219,7 @@ void dm_bufio_release(struct dm_buffer *b)
 		 * invalid buffer.
 		 */
 		if ((b->read_error || b->write_error) &&
-		    !test_bit(B_READING, &b->state) &&
+		    !test_bit_acquire(B_READING, &b->state) &&
 		    !test_bit(B_WRITING, &b->state) &&
 		    !test_bit(B_DIRTY, &b->state)) {
 			__unlink_buffer(b);
@@ -1479,7 +1480,7 @@ EXPORT_SYMBOL_GPL(dm_bufio_release_move);
 
 static void forget_buffer_locked(struct dm_buffer *b)
 {
-	if (likely(!b->hold_count) && likely(!b->state)) {
+	if (likely(!b->hold_count) && likely(!smp_load_acquire(&b->state))) {
 		__unlink_buffer(b);
 		__free_buffer_wake(b);
 	}
@@ -1639,7 +1640,7 @@ static bool __try_evict_buffer(struct dm_buffer *b, gfp_t gfp)
 {
 	if (!(gfp & __GFP_FS) ||
 	    (static_branch_unlikely(&no_sleep_enabled) && b->c->no_sleep)) {
-		if (test_bit(B_READING, &b->state) ||
+		if (test_bit_acquire(B_READING, &b->state) ||
 		    test_bit(B_WRITING, &b->state) ||
 		    test_bit(B_DIRTY, &b->state))
 			return false;

drivers/md/dm-cache-policy.h

@@ -166,7 +166,7 @@ struct dm_cache_policy_type {
 	struct dm_cache_policy_type *real;
 
 	/*
-	 * Policies may store a hint for each each cache block.
+	 * Policies may store a hint for each cache block.
 	 * Currently the size of this hint must be 0 or 4 bytes but we
 	 * expect to relax this in future.
 	 */

drivers/md/dm-clone-target.c

@@ -2035,7 +2035,7 @@ static void disable_passdown_if_not_supported(struct clone *clone)
 		reason = "max discard sectors smaller than a region";
 
 	if (reason) {
-		DMWARN("Destination device (%pd) %s: Disabling discard passdown.",
+		DMWARN("Destination device (%pg) %s: Disabling discard passdown.",
 		       dest_dev, reason);
 		clear_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags);
 	}

drivers/md/dm-ioctl.c

@@ -434,10 +434,10 @@ static struct mapped_device *dm_hash_rename(struct dm_ioctl *param,
 		hc = __get_name_cell(new);
 
 	if (hc) {
-		DMWARN("Unable to change %s on mapped device %s to one that "
-		       "already exists: %s",
-		       change_uuid ? "uuid" : "name",
-		       param->name, new);
+		DMERR("Unable to change %s on mapped device %s to one that "
+		      "already exists: %s",
+		      change_uuid ? "uuid" : "name",
+		      param->name, new);
 		dm_put(hc->md);
 		up_write(&_hash_lock);
 		kfree(new_data);
@@ -449,8 +449,8 @@ static struct mapped_device *dm_hash_rename(struct dm_ioctl *param,
 	 */
 	hc = __get_name_cell(param->name);
 	if (!hc) {
-		DMWARN("Unable to rename non-existent device, %s to %s%s",
-		       param->name, change_uuid ? "uuid " : "", new);
+		DMERR("Unable to rename non-existent device, %s to %s%s",
+		      param->name, change_uuid ? "uuid " : "", new);
 		up_write(&_hash_lock);
 		kfree(new_data);
 		return ERR_PTR(-ENXIO);
@@ -460,9 +460,9 @@ static struct mapped_device *dm_hash_rename(struct dm_ioctl *param,
 	 * Does this device already have a uuid?
 	 */
 	if (change_uuid && hc->uuid) {
-		DMWARN("Unable to change uuid of mapped device %s to %s "
-		       "because uuid is already set to %s",
-		       param->name, new, hc->uuid);
+		DMERR("Unable to change uuid of mapped device %s to %s "
+		      "because uuid is already set to %s",
+		      param->name, new, hc->uuid);
 		dm_put(hc->md);
 		up_write(&_hash_lock);
 		kfree(new_data);
@@ -750,7 +750,7 @@ static int get_target_version(struct file *filp, struct dm_ioctl *param, size_t
 static int check_name(const char *name)
 {
 	if (strchr(name, '/')) {
-		DMWARN("invalid device name");
+		DMERR("invalid device name");
 		return -EINVAL;
 	}
 
@@ -773,7 +773,7 @@ static struct dm_table *dm_get_inactive_table(struct mapped_device *md, int *src
 	down_read(&_hash_lock);
 	hc = dm_get_mdptr(md);
 	if (!hc || hc->md != md) {
-		DMWARN("device has been removed from the dev hash table.");
+		DMERR("device has been removed from the dev hash table.");
 		goto out;
 	}
 
@@ -1026,7 +1026,7 @@ static int dev_rename(struct file *filp, struct dm_ioctl *param, size_t param_si
 	if (new_data < param->data ||
 	    invalid_str(new_data, (void *) param + param_size) || !*new_data ||
 	    strlen(new_data) > (change_uuid ? DM_UUID_LEN - 1 : DM_NAME_LEN - 1)) {
-		DMWARN("Invalid new mapped device name or uuid string supplied.");
+		DMERR("Invalid new mapped device name or uuid string supplied.");
 		return -EINVAL;
 	}
 
@@ -1061,7 +1061,7 @@ static int dev_set_geometry(struct file *filp, struct dm_ioctl *param, size_t pa
 
 	if (geostr < param->data ||
 	    invalid_str(geostr, (void *) param + param_size)) {
-		DMWARN("Invalid geometry supplied.");
+		DMERR("Invalid geometry supplied.");
 		goto out;
 	}
 
@@ -1069,13 +1069,13 @@ static int dev_set_geometry(struct file *filp, struct dm_ioctl *param, size_t pa
 		   indata + 1, indata + 2, indata + 3, &dummy);
 
 	if (x != 4) {
-		DMWARN("Unable to interpret geometry settings.");
+		DMERR("Unable to interpret geometry settings.");
 		goto out;
 	}
 
 	if (indata[0] > 65535 || indata[1] > 255 ||
 	    indata[2] > 255 || indata[3] > ULONG_MAX) {
-		DMWARN("Geometry exceeds range limits.");
+		DMERR("Geometry exceeds range limits.");
 		goto out;
 	}
 
@@ -1387,7 +1387,7 @@ static int populate_table(struct dm_table *table,
 	char *target_params;
 
 	if (!param->target_count) {
-		DMWARN("populate_table: no targets specified");
+		DMERR("populate_table: no targets specified");
 		return -EINVAL;
 	}
 
@@ -1395,7 +1395,7 @@ static int populate_table(struct dm_table *table,
 
 		r = next_target(spec, next, end, &spec, &target_params);
 		if (r) {
-			DMWARN("unable to find target");
+			DMERR("unable to find target");
 			return r;
 		}
 
@@ -1404,7 +1404,7 @@ static int populate_table(struct dm_table *table,
 					(sector_t) spec->length,
 					target_params);
 		if (r) {
-			DMWARN("error adding target to table");
+			DMERR("error adding target to table");
 			return r;
 		}
 
@@ -1451,8 +1451,8 @@ static int table_load(struct file *filp, struct dm_ioctl *param, size_t param_si
 	if (immutable_target_type &&
 	    (immutable_target_type != dm_table_get_immutable_target_type(t)) &&
 	    !dm_table_get_wildcard_target(t)) {
-		DMWARN("can't replace immutable target type %s",
-		       immutable_target_type->name);
+		DMERR("can't replace immutable target type %s",
+		      immutable_target_type->name);
 		r = -EINVAL;
 		goto err_unlock_md_type;
 	}
@@ -1461,12 +1461,12 @@ static int table_load(struct file *filp, struct dm_ioctl *param, size_t param_si
 		/* setup md->queue to reflect md's type (may block) */
 		r = dm_setup_md_queue(md, t);
 		if (r) {
-			DMWARN("unable to set up device queue for new table.");
+			DMERR("unable to set up device queue for new table.");
 			goto err_unlock_md_type;
 		}
 	} else if (!is_valid_type(dm_get_md_type(md), dm_table_get_type(t))) {
-		DMWARN("can't change device type (old=%u vs new=%u) after initial table load.",
-		       dm_get_md_type(md), dm_table_get_type(t));
+		DMERR("can't change device type (old=%u vs new=%u) after initial table load.",
+		      dm_get_md_type(md), dm_table_get_type(t));
 		r = -EINVAL;
 		goto err_unlock_md_type;
 	}
@@ -1477,7 +1477,7 @@ static int table_load(struct file *filp, struct dm_ioctl *param, size_t param_si
 	down_write(&_hash_lock);
 	hc = dm_get_mdptr(md);
 	if (!hc || hc->md != md) {
-		DMWARN("device has been removed from the dev hash table.");
+		DMERR("device has been removed from the dev hash table.");
 		up_write(&_hash_lock);
 		r = -ENXIO;
 		goto err_destroy_table;
@@ -1686,19 +1686,19 @@ static int target_message(struct file *filp, struct dm_ioctl *param, size_t para
 
 	if (tmsg < (struct dm_target_msg *) param->data ||
 	    invalid_str(tmsg->message, (void *) param + param_size)) {
-		DMWARN("Invalid target message parameters.");
+		DMERR("Invalid target message parameters.");
 		r = -EINVAL;
 		goto out;
 	}
 
 	r = dm_split_args(&argc, &argv, tmsg->message);
 	if (r) {
-		DMWARN("Failed to split target message parameters");
+		DMERR("Failed to split target message parameters");
 		goto out;
 	}
 
 	if (!argc) {
-		DMWARN("Empty message received.");
+		DMERR("Empty message received.");
 		r = -EINVAL;
 		goto out_argv;
 	}
@@ -1718,12 +1718,12 @@ static int target_message(struct file *filp, struct dm_ioctl *param, size_t para
 
 	ti = dm_table_find_target(table, tmsg->sector);
 	if (!ti) {
-		DMWARN("Target message sector outside device.");
+		DMERR("Target message sector outside device.");
 		r = -EINVAL;
 	} else if (ti->type->message)
 		r = ti->type->message(ti, argc, argv, result, maxlen);
 	else {
-		DMWARN("Target type does not support messages");
+		DMERR("Target type does not support messages");
 		r = -EINVAL;
 	}
 
@@ -1814,11 +1814,11 @@ static int check_version(unsigned int cmd, struct dm_ioctl __user *user)
 
 	if ((DM_VERSION_MAJOR != version[0]) ||
 	    (DM_VERSION_MINOR < version[1])) {
-		DMWARN("ioctl interface mismatch: "
-		       "kernel(%u.%u.%u), user(%u.%u.%u), cmd(%d)",
-		       DM_VERSION_MAJOR, DM_VERSION_MINOR,
-		       DM_VERSION_PATCHLEVEL,
-		       version[0], version[1], version[2], cmd);
+		DMERR("ioctl interface mismatch: "
+		      "kernel(%u.%u.%u), user(%u.%u.%u), cmd(%d)",
+		      DM_VERSION_MAJOR, DM_VERSION_MINOR,
+		      DM_VERSION_PATCHLEVEL,
+		      version[0], version[1], version[2], cmd);
 		r = -EINVAL;
 	}
 
@@ -1927,11 +1927,11 @@ static int validate_params(uint cmd, struct dm_ioctl *param)
 
 	if (cmd == DM_DEV_CREATE_CMD) {
 		if (!*param->name) {
-			DMWARN("name not supplied when creating device");
+			DMERR("name not supplied when creating device");
 			return -EINVAL;
 		}
 	} else if (*param->uuid && *param->name) {
-		DMWARN("only supply one of name or uuid, cmd(%u)", cmd);
+		DMERR("only supply one of name or uuid, cmd(%u)", cmd);
 		return -EINVAL;
 	}
 
@@ -1978,7 +1978,7 @@ static int ctl_ioctl(struct file *file, uint command, struct dm_ioctl __user *us
 
 	fn = lookup_ioctl(cmd, &ioctl_flags);
 	if (!fn) {
-		DMWARN("dm_ctl_ioctl: unknown command 0x%x", command);
+		DMERR("dm_ctl_ioctl: unknown command 0x%x", command);
 		return -ENOTTY;
 	}
 
@@ -2203,7 +2203,7 @@ int __init dm_early_create(struct dm_ioctl *dmi,
 					(sector_t) spec_array[i]->length,
 					target_params_array[i]);
 		if (r) {
-			DMWARN("error adding target to table");
+			DMERR("error adding target to table");
 			goto err_destroy_table;
 		}
 	}
@@ -2216,7 +2216,7 @@ int __init dm_early_create(struct dm_ioctl *dmi,
 	/* setup md->queue to reflect md's type (may block) */
 	r = dm_setup_md_queue(md, t);
 	if (r) {
-		DMWARN("unable to set up device queue for new table.");
+		DMERR("unable to set up device queue for new table.");
 		goto err_destroy_table;
 	}
 

drivers/md/dm-raid.c

@@ -2529,7 +2529,7 @@ static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
 		 * of the "sync" directive.
 		 *
 		 * With reshaping capability added, we must ensure that
-		 * that the "sync" directive is disallowed during the reshape.
+		 * the "sync" directive is disallowed during the reshape.
 		 */
 		if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
 			continue;
@@ -2590,7 +2590,7 @@ static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
 
 /*
  * Adjust data_offset and new_data_offset on all disk members of @rs
- * for out of place reshaping if requested by contructor
+ * for out of place reshaping if requested by constructor
  *
  * We need free space at the beginning of each raid disk for forward
  * and at the end for backward reshapes which userspace has to provide

drivers/md/dm-rq.c

@@ -238,7 +238,7 @@ static void dm_done(struct request *clone, blk_status_t error, bool mapped)
 		dm_requeue_original_request(tio, true);
 		break;
 	default:
-		DMWARN("unimplemented target endio return value: %d", r);
+		DMCRIT("unimplemented target endio return value: %d", r);
 		BUG();
 	}
 }
@@ -409,7 +409,7 @@ static int map_request(struct dm_rq_target_io *tio)
 		dm_kill_unmapped_request(rq, BLK_STS_IOERR);
 		break;
 	default:
-		DMWARN("unimplemented target map return value: %d", r);
+		DMCRIT("unimplemented target map return value: %d", r);
 		BUG();
 	}
 

drivers/md/dm-stats.c

@@ -1220,7 +1220,7 @@ int dm_stats_message(struct mapped_device *md, unsigned argc, char **argv,
 		return 2; /* this wasn't a stats message */
 
 	if (r == -EINVAL)
-		DMWARN("Invalid parameters for message %s", argv[0]);
+		DMCRIT("Invalid parameters for message %s", argv[0]);
 
 	return r;
 }

drivers/md/dm-table.c

@@ -234,12 +234,12 @@ static int device_area_is_invalid(struct dm_target *ti, struct dm_dev *dev,
 		return 0;
 
 	if ((start >= dev_size) || (start + len > dev_size)) {
-		DMWARN("%s: %pg too small for target: "
-		       "start=%llu, len=%llu, dev_size=%llu",
-		       dm_device_name(ti->table->md), bdev,
-		       (unsigned long long)start,
-		       (unsigned long long)len,
-		       (unsigned long long)dev_size);
+		DMERR("%s: %pg too small for target: "
+		      "start=%llu, len=%llu, dev_size=%llu",
+		      dm_device_name(ti->table->md), bdev,
+		      (unsigned long long)start,
+		      (unsigned long long)len,
+		      (unsigned long long)dev_size);
 		return 1;
 	}
 
@@ -251,10 +251,10 @@ static int device_area_is_invalid(struct dm_target *ti, struct dm_dev *dev,
 		unsigned int zone_sectors = bdev_zone_sectors(bdev);
 
 		if (start & (zone_sectors - 1)) {
-			DMWARN("%s: start=%llu not aligned to h/w zone size %u of %pg",
-			       dm_device_name(ti->table->md),
-			       (unsigned long long)start,
-			       zone_sectors, bdev);
+			DMERR("%s: start=%llu not aligned to h/w zone size %u of %pg",
+			      dm_device_name(ti->table->md),
+			      (unsigned long long)start,
+			      zone_sectors, bdev);
 			return 1;
 		}
 
@@ -268,10 +268,10 @@ static int device_area_is_invalid(struct dm_target *ti, struct dm_dev *dev,
 		 * the sector range.
 		 */
 		if (len & (zone_sectors - 1)) {
-			DMWARN("%s: len=%llu not aligned to h/w zone size %u of %pg",
-			       dm_device_name(ti->table->md),
-			       (unsigned long long)len,
-			       zone_sectors, bdev);
+			DMERR("%s: len=%llu not aligned to h/w zone size %u of %pg",
+			      dm_device_name(ti->table->md),
+			      (unsigned long long)len,
+			      zone_sectors, bdev);
 			return 1;
 		}
 	}
@@ -280,20 +280,20 @@ static int device_area_is_invalid(struct dm_target *ti, struct dm_dev *dev,
 		return 0;
 
 	if (start & (logical_block_size_sectors - 1)) {
-		DMWARN("%s: start=%llu not aligned to h/w "
-		       "logical block size %u of %pg",
-		       dm_device_name(ti->table->md),
-		       (unsigned long long)start,
-		       limits->logical_block_size, bdev);
+		DMERR("%s: start=%llu not aligned to h/w "
+		      "logical block size %u of %pg",
+		      dm_device_name(ti->table->md),
+		      (unsigned long long)start,
+		      limits->logical_block_size, bdev);
 		return 1;
 	}
 
 	if (len & (logical_block_size_sectors - 1)) {
-		DMWARN("%s: len=%llu not aligned to h/w "
-		       "logical block size %u of %pg",
-		       dm_device_name(ti->table->md),
-		       (unsigned long long)len,
-		       limits->logical_block_size, bdev);
+		DMERR("%s: len=%llu not aligned to h/w "
+		      "logical block size %u of %pg",
+		      dm_device_name(ti->table->md),
+		      (unsigned long long)len,
+		      limits->logical_block_size, bdev);
 		return 1;
 	}
 
@@ -434,8 +434,8 @@ void dm_put_device(struct dm_target *ti, struct dm_dev *d)
 		}
 	}
 	if (!found) {
-		DMWARN("%s: device %s not in table devices list",
-		       dm_device_name(ti->table->md), d->name);
+		DMERR("%s: device %s not in table devices list",
+		      dm_device_name(ti->table->md), d->name);
 		return;
 	}
 	if (refcount_dec_and_test(&dd->count)) {
@@ -618,12 +618,12 @@ static int validate_hardware_logical_block_alignment(struct dm_table *t,
 	}
 
 	if (remaining) {
-		DMWARN("%s: table line %u (start sect %llu len %llu) "
-		       "not aligned to h/w logical block size %u",
-		       dm_device_name(t->md), i,
-		       (unsigned long long) ti->begin,
-		       (unsigned long long) ti->len,
-		       limits->logical_block_size);
+		DMERR("%s: table line %u (start sect %llu len %llu) "
+		      "not aligned to h/w logical block size %u",
+		      dm_device_name(t->md), i,
+		      (unsigned long long) ti->begin,
+		      (unsigned long long) ti->len,
+		      limits->logical_block_size);
 		return -EINVAL;
 	}
 
@@ -1008,7 +1008,7 @@ static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *
 	struct dm_md_mempools *pools;
 
 	if (unlikely(type == DM_TYPE_NONE)) {
-		DMWARN("no table type is set, can't allocate mempools");
+		DMERR("no table type is set, can't allocate mempools");
 		return -EINVAL;
 	}
 
@@ -1112,7 +1112,7 @@ static bool integrity_profile_exists(struct gendisk *disk)
  * Get a disk whose integrity profile reflects the table's profile.
  * Returns NULL if integrity support was inconsistent or unavailable.
  */
-static struct gendisk * dm_table_get_integrity_disk(struct dm_table *t)
+static struct gendisk *dm_table_get_integrity_disk(struct dm_table *t)
 {
 	struct list_head *devices = dm_table_get_devices(t);
 	struct dm_dev_internal *dd = NULL;
@@ -1185,10 +1185,10 @@ static int dm_table_register_integrity(struct dm_table *t)
 	 * profile the new profile should not conflict.
 	 */
 	if (blk_integrity_compare(dm_disk(md), template_disk) < 0) {
-		DMWARN("%s: conflict with existing integrity profile: "
-		       "%s profile mismatch",
-		       dm_device_name(t->md),
-		       template_disk->disk_name);
+		DMERR("%s: conflict with existing integrity profile: "
+		      "%s profile mismatch",
+		      dm_device_name(t->md),
+		      template_disk->disk_name);
 		return 1;
 	}
 
@@ -1327,7 +1327,7 @@ static int dm_table_construct_crypto_profile(struct dm_table *t)
 	if (t->md->queue &&
 	    !blk_crypto_has_capabilities(profile,
 					 t->md->queue->crypto_profile)) {
-		DMWARN("Inline encryption capabilities of new DM table were more restrictive than the old table's. This is not supported!");
+		DMERR("Inline encryption capabilities of new DM table were more restrictive than the old table's. This is not supported!");
 		dm_destroy_crypto_profile(profile);
 		return -EINVAL;
 	}

drivers/md/dm-verity-target.c

@@ -1401,14 +1401,16 @@ static int verity_ctr(struct dm_target *ti, unsigned argc, char **argv)
 
 	/* WQ_UNBOUND greatly improves performance when running on ramdisk */
 	wq_flags = WQ_MEM_RECLAIM | WQ_UNBOUND;
-	if (v->use_tasklet) {
-		/*
-		 * Allow verify_wq to preempt softirq since verification in
-		 * tasklet will fall-back to using it for error handling
-		 * (or if the bufio cache doesn't have required hashes).
-		 */
-		wq_flags |= WQ_HIGHPRI;
-	}
+	/*
+	 * Using WQ_HIGHPRI improves throughput and completion latency by
+	 * reducing wait times when reading from a dm-verity device.
+	 *
+	 * Also as required for the "try_verify_in_tasklet" feature: WQ_HIGHPRI
+	 * allows verify_wq to preempt softirq since verification in tasklet
+	 * will fall-back to using it for error handling (or if the bufio cache
+	 * doesn't have required hashes).
+	 */
+	wq_flags |= WQ_HIGHPRI;
 	v->verify_wq = alloc_workqueue("kverityd", wq_flags, num_online_cpus());
 	if (!v->verify_wq) {
 		ti->error = "Cannot allocate workqueue";

drivers/md/dm.c

@@ -864,7 +864,7 @@ int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo)
 	sector_t sz = (sector_t)geo->cylinders * geo->heads * geo->sectors;
 
 	if (geo->start > sz) {
-		DMWARN("Start sector is beyond the geometry limits.");
+		DMERR("Start sector is beyond the geometry limits.");
 		return -EINVAL;
 	}
 
@@ -1149,7 +1149,7 @@ static void clone_endio(struct bio *bio)
 			/* The target will handle the io */
 			return;
 		default:
-			DMWARN("unimplemented target endio return value: %d", r);
+			DMCRIT("unimplemented target endio return value: %d", r);
 			BUG();
 		}
 	}
@@ -1455,7 +1455,7 @@ static void __map_bio(struct bio *clone)
 			dm_io_dec_pending(io, BLK_STS_DM_REQUEUE);
 		break;
 	default:
-		DMWARN("unimplemented target map return value: %d", r);
+		DMCRIT("unimplemented target map return value: %d", r);
 		BUG();
 	}
 }
@@ -2005,7 +2005,7 @@ static struct mapped_device *alloc_dev(int minor)
 
 	md = kvzalloc_node(sizeof(*md), GFP_KERNEL, numa_node_id);
 	if (!md) {
-		DMWARN("unable to allocate device, out of memory.");
+		DMERR("unable to allocate device, out of memory.");
 		return NULL;
 	}
 
@@ -2065,7 +2065,6 @@ static struct mapped_device *alloc_dev(int minor)
 	md->disk->minors = 1;
 	md->disk->flags |= GENHD_FL_NO_PART;
 	md->disk->fops = &dm_blk_dops;
-	md->disk->queue = md->queue;
 	md->disk->private_data = md;
 	sprintf(md->disk->disk_name, "dm-%d", minor);