diff --git a/block/blk-crypto.c b/block/blk-crypto.c
index f56bbec1132f..e07a37cf8b5f 100644
--- a/block/blk-crypto.c
+++ b/block/blk-crypto.c
@@ -108,9 +108,10 @@ int blk_crypto_submit_bio(struct bio **bio_ptr)
 
 	/* Get device keyslot if supported */
 	if (keyslot_manager_crypto_mode_supported(q->ksm,
-						  bc->bc_key->crypto_mode,
-						  bc->bc_key->data_unit_size,
-						  bc->bc_key->is_hw_wrapped)) {
+				bc->bc_key->crypto_mode,
+				blk_crypto_key_dun_bytes(bc->bc_key),
+				bc->bc_key->data_unit_size,
+				bc->bc_key->is_hw_wrapped)) {
 		err = bio_crypt_ctx_acquire_keyslot(bc, q->ksm);
 		if (!err)
 			return 0;
@@ -180,6 +181,8 @@ bool blk_crypto_endio(struct bio *bio)
  *                @is_hw_wrapped has to be set for such keys)
  * @is_hw_wrapped: Denotes @raw_key is wrapped.
  * @crypto_mode: identifier for the encryption algorithm to use
+ * @dun_bytes: number of bytes that will be used to specify the DUN when this
+ *	       key is used
  * @data_unit_size: the data unit size to use for en/decryption
  *
  * Return: The blk_crypto_key that was prepared, or an ERR_PTR() on error.  When
@@ -189,10 +192,12 @@ int blk_crypto_init_key(struct blk_crypto_key *blk_key,
 			const u8 *raw_key, unsigned int raw_key_size,
 			bool is_hw_wrapped,
 			enum blk_crypto_mode_num crypto_mode,
+			unsigned int dun_bytes,
 			unsigned int data_unit_size)
 {
 	const struct blk_crypto_mode *mode;
 	static siphash_key_t hash_key;
+	u32 hash;
 
 	memset(blk_key, 0, sizeof(*blk_key));
 
@@ -211,6 +216,9 @@ int blk_crypto_init_key(struct blk_crypto_key *blk_key,
 			return -EINVAL;
 	}
 
+	if (dun_bytes <= 0 || dun_bytes > BLK_CRYPTO_MAX_IV_SIZE)
+		return -EINVAL;
+
 	if (!is_power_of_2(data_unit_size))
 		return -EINVAL;
 
@@ -227,7 +235,8 @@ int blk_crypto_init_key(struct blk_crypto_key *blk_key,
 	 * precomputed here so that it only needs to be computed once per key.
 	 */
 	get_random_once(&hash_key, sizeof(hash_key));
-	blk_key->hash = siphash(raw_key, raw_key_size, &hash_key);
+	hash = (u32)siphash(raw_key, raw_key_size, &hash_key);
+	blk_crypto_key_set_hash_and_dun_bytes(blk_key, hash, dun_bytes);
 
 	return 0;
 }
@@ -236,6 +245,7 @@ EXPORT_SYMBOL_GPL(blk_crypto_init_key);
 /**
  * blk_crypto_start_using_mode() - Start using blk-crypto on a device
  * @crypto_mode: the crypto mode that will be used
+ * @dun_bytes: number of bytes that will be used to specify the DUN
  * @data_unit_size: the data unit size that will be used
  * @is_hw_wrapped_key: whether the key will be hardware-wrapped
  * @q: the request queue for the device
@@ -249,12 +259,13 @@ EXPORT_SYMBOL_GPL(blk_crypto_init_key);
  *	   algorithm is disabled in the crypto API; or another -errno code.
  */
 int blk_crypto_start_using_mode(enum blk_crypto_mode_num crypto_mode,
+				unsigned int dun_bytes,
 				unsigned int data_unit_size,
 				bool is_hw_wrapped_key,
 				struct request_queue *q)
 {
 	if (keyslot_manager_crypto_mode_supported(q->ksm, crypto_mode,
-						  data_unit_size,
+						  dun_bytes, data_unit_size,
 						  is_hw_wrapped_key))
 		return 0;
 	if (is_hw_wrapped_key) {
@@ -285,6 +296,7 @@ int blk_crypto_evict_key(struct request_queue *q,
 {
 	if (q->ksm &&
 	    keyslot_manager_crypto_mode_supported(q->ksm, key->crypto_mode,
+						  blk_crypto_key_dun_bytes(key),
 						  key->data_unit_size,
 						  key->is_hw_wrapped))
 		return keyslot_manager_evict_key(q->ksm, key);
diff --git a/block/keyslot-manager.c b/block/keyslot-manager.c
index d1dbac6e1a46..74b7485187e1 100644
--- a/block/keyslot-manager.c
+++ b/block/keyslot-manager.c
@@ -45,6 +45,7 @@ struct keyslot_manager {
 	struct keyslot_mgmt_ll_ops ksm_ll_ops;
 	unsigned int features;
 	unsigned int crypto_mode_supported[BLK_ENCRYPTION_MODE_MAX];
+	unsigned int max_dun_bytes_supported;
 	void *ll_priv_data;
 
 #ifdef CONFIG_PM
@@ -182,6 +183,7 @@ struct keyslot_manager *keyslot_manager_create(
 	ksm->features = features;
 	memcpy(ksm->crypto_mode_supported, crypto_mode_supported,
 	       sizeof(ksm->crypto_mode_supported));
+	ksm->max_dun_bytes_supported = BLK_CRYPTO_MAX_IV_SIZE;
 	ksm->ll_priv_data = ll_priv_data;
 	keyslot_manager_set_dev(ksm, dev);
 
@@ -214,11 +216,19 @@ err_free_ksm:
 }
 EXPORT_SYMBOL_GPL(keyslot_manager_create);
 
+void keyslot_manager_set_max_dun_bytes(struct keyslot_manager *ksm,
+				       unsigned int max_dun_bytes)
+{
+	ksm->max_dun_bytes_supported = max_dun_bytes;
+}
+EXPORT_SYMBOL_GPL(keyslot_manager_set_max_dun_bytes);
+
 static inline struct hlist_head *
 hash_bucket_for_key(struct keyslot_manager *ksm,
 		    const struct blk_crypto_key *key)
 {
-	return &ksm->slot_hashtable[key->hash & (ksm->slot_hashtable_size - 1)];
+	return &ksm->slot_hashtable[blk_crypto_key_hash(key) &
+				    (ksm->slot_hashtable_size - 1)];
 }
 
 static void remove_slot_from_lru_list(struct keyslot_manager *ksm, int slot)
@@ -391,6 +401,7 @@ void keyslot_manager_put_slot(struct keyslot_manager *ksm, unsigned int slot)
  *					     combination is supported by a ksm.
  * @ksm: The keyslot manager to check
  * @crypto_mode: The crypto mode to check for.
+ * @dun_bytes: The number of bytes that will be used to specify the DUN
  * @data_unit_size: The data_unit_size for the mode.
  * @is_hw_wrapped_key: Whether a hardware-wrapped key will be used.
  *
@@ -402,6 +413,7 @@ void keyslot_manager_put_slot(struct keyslot_manager *ksm, unsigned int slot)
  */
 bool keyslot_manager_crypto_mode_supported(struct keyslot_manager *ksm,
 					   enum blk_crypto_mode_num crypto_mode,
+					   unsigned int dun_bytes,
 					   unsigned int data_unit_size,
 					   bool is_hw_wrapped_key)
 {
@@ -418,7 +430,10 @@ bool keyslot_manager_crypto_mode_supported(struct keyslot_manager *ksm,
 		if (!(ksm->features & BLK_CRYPTO_FEATURE_STANDARD_KEYS))
 			return false;
 	}
-	return ksm->crypto_mode_supported[crypto_mode] & data_unit_size;
+	if (!(ksm->crypto_mode_supported[crypto_mode] & data_unit_size))
+		return false;
+
+	return ksm->max_dun_bytes_supported >= dun_bytes;
 }
 
 /**
@@ -565,6 +580,7 @@ struct keyslot_manager *keyslot_manager_create_passthrough(
 	ksm->features = features;
 	memcpy(ksm->crypto_mode_supported, crypto_mode_supported,
 	       sizeof(ksm->crypto_mode_supported));
+	ksm->max_dun_bytes_supported = BLK_CRYPTO_MAX_IV_SIZE;
 	ksm->ll_priv_data = ll_priv_data;
 	keyslot_manager_set_dev(ksm, dev);
 
@@ -592,12 +608,16 @@ void keyslot_manager_intersect_modes(struct keyslot_manager *parent,
 		unsigned int i;
 
 		parent->features &= child->features;
+		parent->max_dun_bytes_supported =
+			min(parent->max_dun_bytes_supported,
+			    child->max_dun_bytes_supported);
 		for (i = 0; i < ARRAY_SIZE(child->crypto_mode_supported); i++) {
 			parent->crypto_mode_supported[i] &=
 				child->crypto_mode_supported[i];
 		}
 	} else {
 		parent->features = 0;
+		parent->max_dun_bytes_supported = 0;
 		memset(parent->crypto_mode_supported, 0,
 		       sizeof(parent->crypto_mode_supported));
 	}
diff --git a/drivers/md/dm-default-key.c b/drivers/md/dm-default-key.c
index 82a3e43bb019..f0cc1634e2b3 100644
--- a/drivers/md/dm-default-key.c
+++ b/drivers/md/dm-default-key.c
@@ -232,14 +232,14 @@ static int default_key_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 
 	err = blk_crypto_init_key(&dkc->key, raw_key, raw_key_size,
 				  dkc->is_hw_wrapped, cipher->mode_num,
-				  dkc->sector_size);
+				  sizeof(u64), dkc->sector_size);
 	if (err) {
 		ti->error = "Error initializing blk-crypto key";
 		goto bad;
 	}
 
-	err = blk_crypto_start_using_mode(cipher->mode_num, dkc->sector_size,
-					  dkc->is_hw_wrapped,
+	err = blk_crypto_start_using_mode(cipher->mode_num, sizeof(u64),
+					  dkc->sector_size, dkc->is_hw_wrapped,
 					  dkc->dev->bdev->bd_queue);
 	if (err) {
 		ti->error = "Error starting to use blk-crypto";
diff --git a/drivers/scsi/ufs/ufshcd-crypto.c b/drivers/scsi/ufs/ufshcd-crypto.c
index d698ecbd5e4f..43d105bc0e26 100644
--- a/drivers/scsi/ufs/ufshcd-crypto.c
+++ b/drivers/scsi/ufs/ufshcd-crypto.c
@@ -344,6 +344,7 @@ int ufshcd_hba_init_crypto_spec(struct ufs_hba *hba,
 		err = -ENOMEM;
 		goto out_free_caps;
 	}
+	keyslot_manager_set_max_dun_bytes(hba->ksm, sizeof(u64));
 
 	return 0;
 
diff --git a/fs/crypto/inline_crypt.c b/fs/crypto/inline_crypt.c
index eaa2014ec84b..a932c8f9ce80 100644
--- a/fs/crypto/inline_crypt.c
+++ b/fs/crypto/inline_crypt.c
@@ -41,6 +41,17 @@ static void fscrypt_get_devices(struct super_block *sb, int num_devs,
 		sb->s_cop->get_devices(sb, devs);
 }
 
+static unsigned int fscrypt_get_dun_bytes(const struct fscrypt_info *ci)
+{
+	unsigned int dun_bytes = 8;
+
+	if (fscrypt_policy_flags(&ci->ci_policy) &
+	    FSCRYPT_POLICY_FLAG_DIRECT_KEY)
+		dun_bytes += FS_KEY_DERIVATION_NONCE_SIZE;
+
+	return dun_bytes;
+}
+
 /* Enable inline encryption for this file if supported. */
 int fscrypt_select_encryption_impl(struct fscrypt_info *ci,
 				   bool is_hw_wrapped_key)
@@ -48,6 +59,7 @@ int fscrypt_select_encryption_impl(struct fscrypt_info *ci,
 	const struct inode *inode = ci->ci_inode;
 	struct super_block *sb = inode->i_sb;
 	enum blk_crypto_mode_num crypto_mode = ci->ci_mode->blk_crypto_mode;
+	unsigned int dun_bytes;
 	struct request_queue **devs;
 	int num_devs;
 	int i;
@@ -83,9 +95,12 @@ int fscrypt_select_encryption_impl(struct fscrypt_info *ci,
 
 	fscrypt_get_devices(sb, num_devs, devs);
 
+	dun_bytes = fscrypt_get_dun_bytes(ci);
+
 	for (i = 0; i < num_devs; i++) {
 		if (!keyslot_manager_crypto_mode_supported(devs[i]->ksm,
 							   crypto_mode,
+							   dun_bytes,
 							   sb->s_blocksize,
 							   is_hw_wrapped_key))
 			goto out_free_devs;
@@ -106,6 +121,7 @@ int fscrypt_prepare_inline_crypt_key(struct fscrypt_prepared_key *prep_key,
 	const struct inode *inode = ci->ci_inode;
 	struct super_block *sb = inode->i_sb;
 	enum blk_crypto_mode_num crypto_mode = ci->ci_mode->blk_crypto_mode;
+	unsigned int dun_bytes;
 	int num_devs;
 	int queue_refs = 0;
 	struct fscrypt_blk_crypto_key *blk_key;
@@ -123,11 +139,14 @@ int fscrypt_prepare_inline_crypt_key(struct fscrypt_prepared_key *prep_key,
 	blk_key->num_devs = num_devs;
 	fscrypt_get_devices(sb, num_devs, blk_key->devs);
 
+	dun_bytes = fscrypt_get_dun_bytes(ci);
+
 	BUILD_BUG_ON(FSCRYPT_MAX_HW_WRAPPED_KEY_SIZE >
 		     BLK_CRYPTO_MAX_WRAPPED_KEY_SIZE);
 
 	err = blk_crypto_init_key(&blk_key->base, raw_key, raw_key_size,
-				  is_hw_wrapped, crypto_mode, sb->s_blocksize);
+				  is_hw_wrapped, crypto_mode, dun_bytes,
+				  sb->s_blocksize);
 	if (err) {
 		fscrypt_err(inode, "error %d initializing blk-crypto key", err);
 		goto fail;
@@ -148,7 +167,8 @@ int fscrypt_prepare_inline_crypt_key(struct fscrypt_prepared_key *prep_key,
 		}
 		queue_refs++;
 
-		err = blk_crypto_start_using_mode(crypto_mode, sb->s_blocksize,
+		err = blk_crypto_start_using_mode(crypto_mode, dun_bytes,
+						  sb->s_blocksize,
 						  is_hw_wrapped,
 						  blk_key->devs[i]);
 		if (err) {
diff --git a/include/linux/bio-crypt-ctx.h b/include/linux/bio-crypt-ctx.h
index 8456a409fc21..9df113f74e9e 100644
--- a/include/linux/bio-crypt-ctx.h
+++ b/include/linux/bio-crypt-ctx.h
@@ -43,7 +43,15 @@ struct blk_crypto_key {
 	unsigned int data_unit_size;
 	unsigned int data_unit_size_bits;
 	unsigned int size;
+
+	/*
+	 * Hack to avoid breaking KMI: pack both hash and dun_bytes into the
+	 * hash field...
+	 */
+#define BLK_CRYPTO_KEY_HASH_MASK		0xffffff
+#define BLK_CRYPTO_KEY_DUN_BYTES_SHIFT		24
 	unsigned int hash;
+
 	bool is_hw_wrapped;
 	u8 raw[BLK_CRYPTO_MAX_WRAPPED_KEY_SIZE];
 };
@@ -51,6 +59,26 @@ struct blk_crypto_key {
 #define BLK_CRYPTO_MAX_IV_SIZE		32
 #define BLK_CRYPTO_DUN_ARRAY_SIZE	(BLK_CRYPTO_MAX_IV_SIZE/sizeof(u64))
 
+static inline void
+blk_crypto_key_set_hash_and_dun_bytes(struct blk_crypto_key *key,
+				      u32 hash, unsigned int dun_bytes)
+{
+	key->hash = (dun_bytes << BLK_CRYPTO_KEY_DUN_BYTES_SHIFT) |
+		    (hash & BLK_CRYPTO_KEY_HASH_MASK);
+}
+
+static inline u32
+blk_crypto_key_hash(const struct blk_crypto_key *key)
+{
+	return key->hash & BLK_CRYPTO_KEY_HASH_MASK;
+}
+
+static inline unsigned int
+blk_crypto_key_dun_bytes(const struct blk_crypto_key *key)
+{
+	return key->hash >> BLK_CRYPTO_KEY_DUN_BYTES_SHIFT;
+}
+
 /**
  * struct bio_crypt_ctx - an inline encryption context
  * @bc_key: the key, algorithm, and data unit size to use
diff --git a/include/linux/blk-crypto.h b/include/linux/blk-crypto.h
index d383d3b320b9..30a0b32900b4 100644
--- a/include/linux/blk-crypto.h
+++ b/include/linux/blk-crypto.h
@@ -18,9 +18,11 @@ int blk_crypto_init_key(struct blk_crypto_key *blk_key,
 			const u8 *raw_key, unsigned int raw_key_size,
 			bool is_hw_wrapped,
 			enum blk_crypto_mode_num crypto_mode,
+			unsigned int dun_bytes,
 			unsigned int data_unit_size);
 
 int blk_crypto_start_using_mode(enum blk_crypto_mode_num crypto_mode,
+				unsigned int dun_bytes,
 				unsigned int data_unit_size,
 				bool is_hw_wrapped_key,
 				struct request_queue *q);
diff --git a/include/linux/keyslot-manager.h b/include/linux/keyslot-manager.h
index cd65bea927db..f5e0eed468b0 100644
--- a/include/linux/keyslot-manager.h
+++ b/include/linux/keyslot-manager.h
@@ -58,6 +58,9 @@ struct keyslot_manager *keyslot_manager_create(
 	const unsigned int crypto_mode_supported[BLK_ENCRYPTION_MODE_MAX],
 	void *ll_priv_data);
 
+void keyslot_manager_set_max_dun_bytes(struct keyslot_manager *ksm,
+				       unsigned int max_dun_bytes);
+
 int keyslot_manager_get_slot_for_key(struct keyslot_manager *ksm,
 				     const struct blk_crypto_key *key);
 
@@ -67,6 +70,7 @@ void keyslot_manager_put_slot(struct keyslot_manager *ksm, unsigned int slot);
 
 bool keyslot_manager_crypto_mode_supported(struct keyslot_manager *ksm,
 					   enum blk_crypto_mode_num crypto_mode,
+					   unsigned int dun_bytes,
 					   unsigned int data_unit_size,
 					   bool is_hw_wrapped_key);