blk-crypto-profile.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright 2019 Google LLC
  4 */
  5
  6/**
  7 * DOC: blk-crypto profiles
  8 *
  9 * 'struct blk_crypto_profile' contains all generic inline encryption-related
 10 * state for a particular inline encryption device.  blk_crypto_profile serves
 11 * as the way that drivers for inline encryption hardware expose their crypto
 12 * capabilities and certain functions (e.g., functions to program and evict
 13 * keys) to upper layers.  Device drivers that want to support inline encryption
 14 * construct a crypto profile, then associate it with the disk's request_queue.
 15 *
 16 * If the device has keyslots, then its blk_crypto_profile also handles managing
 17 * these keyslots in a device-independent way, using the driver-provided
 18 * functions to program and evict keys as needed.  This includes keeping track
 19 * of which key and how many I/O requests are using each keyslot, getting
 20 * keyslots for I/O requests, and handling key eviction requests.
 21 *
 22 * For more information, see Documentation/block/inline-encryption.rst.
 23 */
 24
 25#define pr_fmt(fmt) "blk-crypto: " fmt
 26
 27#include <linux/blk-crypto-profile.h>
 28#include <linux/device.h>
 29#include <linux/atomic.h>
 30#include <linux/mutex.h>
 31#include <linux/pm_runtime.h>
 32#include <linux/wait.h>
 33#include <linux/blkdev.h>
 34#include <linux/blk-integrity.h>
 35#include "blk-crypto-internal.h"
 36
 37struct blk_crypto_keyslot {
 38	atomic_t slot_refs;
 39	struct list_head idle_slot_node;
 40	struct hlist_node hash_node;
 41	const struct blk_crypto_key *key;
 42	struct blk_crypto_profile *profile;
 43};
 44
 45static inline void blk_crypto_hw_enter(struct blk_crypto_profile *profile)
 46{
 47	/*
 48	 * Calling into the driver requires profile->lock held and the device
 49	 * resumed.  But we must resume the device first, since that can acquire
 50	 * and release profile->lock via blk_crypto_reprogram_all_keys().
 51	 */
 52	if (profile->dev)
 53		pm_runtime_get_sync(profile->dev);
 54	down_write(&profile->lock);
 55}
 56
 57static inline void blk_crypto_hw_exit(struct blk_crypto_profile *profile)
 58{
 59	up_write(&profile->lock);
 60	if (profile->dev)
 61		pm_runtime_put_sync(profile->dev);
 62}
 63
 64/**
 65 * blk_crypto_profile_init() - Initialize a blk_crypto_profile
 66 * @profile: the blk_crypto_profile to initialize
 67 * @num_slots: the number of keyslots
 68 *
 69 * Storage drivers must call this when starting to set up a blk_crypto_profile,
 70 * before filling in additional fields.
 71 *
 72 * Return: 0 on success, or else a negative error code.
 73 */
 74int blk_crypto_profile_init(struct blk_crypto_profile *profile,
 75			    unsigned int num_slots)
 76{
 77	unsigned int slot;
 78	unsigned int i;
 79	unsigned int slot_hashtable_size;
 80
 81	memset(profile, 0, sizeof(*profile));
 82
 83	/*
 84	 * profile->lock of an underlying device can nest inside profile->lock
 85	 * of a device-mapper device, so use a dynamic lock class to avoid
 86	 * false-positive lockdep reports.
 87	 */
 88	lockdep_register_key(&profile->lockdep_key);
 89	__init_rwsem(&profile->lock, "&profile->lock", &profile->lockdep_key);
 90
 91	if (num_slots == 0)
 92		return 0;
 93
 94	/* Initialize keyslot management data. */
 95
 96	profile->slots = kvcalloc(num_slots, sizeof(profile->slots[0]),
 97				  GFP_KERNEL);
 98	if (!profile->slots)
 99		goto err_destroy;
100
101	profile->num_slots = num_slots;
102
103	init_waitqueue_head(&profile->idle_slots_wait_queue);
104	INIT_LIST_HEAD(&profile->idle_slots);
105
106	for (slot = 0; slot < num_slots; slot++) {
107		profile->slots[slot].profile = profile;
108		list_add_tail(&profile->slots[slot].idle_slot_node,
109			      &profile->idle_slots);
110	}
111
112	spin_lock_init(&profile->idle_slots_lock);
113
114	slot_hashtable_size = roundup_pow_of_two(num_slots);
115	/*
116	 * hash_ptr() assumes bits != 0, so ensure the hash table has at least 2
117	 * buckets.  This only makes a difference when there is only 1 keyslot.
118	 */
119	if (slot_hashtable_size < 2)
120		slot_hashtable_size = 2;
121
122	profile->log_slot_ht_size = ilog2(slot_hashtable_size);
123	profile->slot_hashtable =
124		kvmalloc_array(slot_hashtable_size,
125			       sizeof(profile->slot_hashtable[0]), GFP_KERNEL);
126	if (!profile->slot_hashtable)
127		goto err_destroy;
128	for (i = 0; i < slot_hashtable_size; i++)
129		INIT_HLIST_HEAD(&profile->slot_hashtable[i]);
130
131	return 0;
132
133err_destroy:
134	blk_crypto_profile_destroy(profile);
135	return -ENOMEM;
136}
137EXPORT_SYMBOL_GPL(blk_crypto_profile_init);
138
139static void blk_crypto_profile_destroy_callback(void *profile)
140{
141	blk_crypto_profile_destroy(profile);
142}
143
144/**
145 * devm_blk_crypto_profile_init() - Resource-managed blk_crypto_profile_init()
146 * @dev: the device which owns the blk_crypto_profile
147 * @profile: the blk_crypto_profile to initialize
148 * @num_slots: the number of keyslots
149 *
150 * Like blk_crypto_profile_init(), but causes blk_crypto_profile_destroy() to be
151 * called automatically on driver detach.
152 *
153 * Return: 0 on success, or else a negative error code.
154 */
155int devm_blk_crypto_profile_init(struct device *dev,
156				 struct blk_crypto_profile *profile,
157				 unsigned int num_slots)
158{
159	int err = blk_crypto_profile_init(profile, num_slots);
160
161	if (err)
162		return err;
163
164	return devm_add_action_or_reset(dev,
165					blk_crypto_profile_destroy_callback,
166					profile);
167}
168EXPORT_SYMBOL_GPL(devm_blk_crypto_profile_init);
169
170static inline struct hlist_head *
171blk_crypto_hash_bucket_for_key(struct blk_crypto_profile *profile,
172			       const struct blk_crypto_key *key)
173{
174	return &profile->slot_hashtable[
175			hash_ptr(key, profile->log_slot_ht_size)];
176}
177
178static void
179blk_crypto_remove_slot_from_lru_list(struct blk_crypto_keyslot *slot)
180{
181	struct blk_crypto_profile *profile = slot->profile;
182	unsigned long flags;
183
184	spin_lock_irqsave(&profile->idle_slots_lock, flags);
185	list_del(&slot->idle_slot_node);
186	spin_unlock_irqrestore(&profile->idle_slots_lock, flags);
187}
188
189static struct blk_crypto_keyslot *
190blk_crypto_find_keyslot(struct blk_crypto_profile *profile,
191			const struct blk_crypto_key *key)
192{
193	const struct hlist_head *head =
194		blk_crypto_hash_bucket_for_key(profile, key);
195	struct blk_crypto_keyslot *slotp;
196
197	hlist_for_each_entry(slotp, head, hash_node) {
198		if (slotp->key == key)
199			return slotp;
200	}
201	return NULL;
202}
203
204static struct blk_crypto_keyslot *
205blk_crypto_find_and_grab_keyslot(struct blk_crypto_profile *profile,
206				 const struct blk_crypto_key *key)
207{
208	struct blk_crypto_keyslot *slot;
209
210	slot = blk_crypto_find_keyslot(profile, key);
211	if (!slot)
212		return NULL;
213	if (atomic_inc_return(&slot->slot_refs) == 1) {
214		/* Took first reference to this slot; remove it from LRU list */
215		blk_crypto_remove_slot_from_lru_list(slot);
216	}
217	return slot;
218}
219
220/**
221 * blk_crypto_keyslot_index() - Get the index of a keyslot
222 * @slot: a keyslot that blk_crypto_get_keyslot() returned
223 *
224 * Return: the 0-based index of the keyslot within the device's keyslots.
225 */
226unsigned int blk_crypto_keyslot_index(struct blk_crypto_keyslot *slot)
227{
228	return slot - slot->profile->slots;
229}
230EXPORT_SYMBOL_GPL(blk_crypto_keyslot_index);
231
232/**
233 * blk_crypto_get_keyslot() - Get a keyslot for a key, if needed.
234 * @profile: the crypto profile of the device the key will be used on
235 * @key: the key that will be used
236 * @slot_ptr: If a keyslot is allocated, an opaque pointer to the keyslot struct
237 *	      will be stored here.  blk_crypto_put_keyslot() must be called
238 *	      later to release it.  Otherwise, NULL will be stored here.
239 *
240 * If the device has keyslots, this gets a keyslot that's been programmed with
241 * the specified key.  If the key is already in a slot, this reuses it;
242 * otherwise this waits for a slot to become idle and programs the key into it.
243 *
244 * Context: Process context. Takes and releases profile->lock.
245 * Return: BLK_STS_OK on success, meaning that either a keyslot was allocated or
246 *	   one wasn't needed; or a blk_status_t error on failure.
247 */
248blk_status_t blk_crypto_get_keyslot(struct blk_crypto_profile *profile,
249				    const struct blk_crypto_key *key,
250				    struct blk_crypto_keyslot **slot_ptr)
251{
252	struct blk_crypto_keyslot *slot;
253	int slot_idx;
254	int err;
255
256	*slot_ptr = NULL;
257
258	/*
259	 * If the device has no concept of "keyslots", then there is no need to
260	 * get one.
261	 */
262	if (profile->num_slots == 0)
263		return BLK_STS_OK;
264
265	down_read(&profile->lock);
266	slot = blk_crypto_find_and_grab_keyslot(profile, key);
267	up_read(&profile->lock);
268	if (slot)
269		goto success;
270
271	for (;;) {
272		blk_crypto_hw_enter(profile);
273		slot = blk_crypto_find_and_grab_keyslot(profile, key);
274		if (slot) {
275			blk_crypto_hw_exit(profile);
276			goto success;
277		}
278
279		/*
280		 * If we're here, that means there wasn't a slot that was
281		 * already programmed with the key. So try to program it.
282		 */
283		if (!list_empty(&profile->idle_slots))
284			break;
285
286		blk_crypto_hw_exit(profile);
287		wait_event(profile->idle_slots_wait_queue,
288			   !list_empty(&profile->idle_slots));
289	}
290
291	slot = list_first_entry(&profile->idle_slots, struct blk_crypto_keyslot,
292				idle_slot_node);
293	slot_idx = blk_crypto_keyslot_index(slot);
294
295	err = profile->ll_ops.keyslot_program(profile, key, slot_idx);
296	if (err) {
297		wake_up(&profile->idle_slots_wait_queue);
298		blk_crypto_hw_exit(profile);
299		return errno_to_blk_status(err);
300	}
301
302	/* Move this slot to the hash list for the new key. */
303	if (slot->key)
304		hlist_del(&slot->hash_node);
305	slot->key = key;
306	hlist_add_head(&slot->hash_node,
307		       blk_crypto_hash_bucket_for_key(profile, key));
308
309	atomic_set(&slot->slot_refs, 1);
310
311	blk_crypto_remove_slot_from_lru_list(slot);
312
313	blk_crypto_hw_exit(profile);
314success:
315	*slot_ptr = slot;
316	return BLK_STS_OK;
317}
318
319/**
320 * blk_crypto_put_keyslot() - Release a reference to a keyslot
321 * @slot: The keyslot to release the reference of
322 *
323 * Context: Any context.
324 */
325void blk_crypto_put_keyslot(struct blk_crypto_keyslot *slot)
326{
327	struct blk_crypto_profile *profile = slot->profile;
328	unsigned long flags;
329
330	if (atomic_dec_and_lock_irqsave(&slot->slot_refs,
331					&profile->idle_slots_lock, flags)) {
332		list_add_tail(&slot->idle_slot_node, &profile->idle_slots);
333		spin_unlock_irqrestore(&profile->idle_slots_lock, flags);
334		wake_up(&profile->idle_slots_wait_queue);
335	}
336}
337
338/**
339 * __blk_crypto_cfg_supported() - Check whether the given crypto profile
340 *				  supports the given crypto configuration.
341 * @profile: the crypto profile to check
342 * @cfg: the crypto configuration to check for
343 *
344 * Return: %true if @profile supports the given @cfg.
345 */
346bool __blk_crypto_cfg_supported(struct blk_crypto_profile *profile,
347				const struct blk_crypto_config *cfg)
348{
349	if (!profile)
350		return false;
351	if (!(profile->modes_supported[cfg->crypto_mode] & cfg->data_unit_size))
352		return false;
353	if (profile->max_dun_bytes_supported < cfg->dun_bytes)
354		return false;
355	if (!(profile->key_types_supported & cfg->key_type))
356		return false;
357	return true;
358}
359
360/*
361 * This is an internal function that evicts a key from an inline encryption
362 * device that can be either a real device or the blk-crypto-fallback "device".
363 * It is used only by blk_crypto_evict_key(); see that function for details.
364 */
365int __blk_crypto_evict_key(struct blk_crypto_profile *profile,
366			   const struct blk_crypto_key *key)
367{
368	struct blk_crypto_keyslot *slot;
369	int err;
370
371	if (profile->num_slots == 0) {
372		if (profile->ll_ops.keyslot_evict) {
373			blk_crypto_hw_enter(profile);
374			err = profile->ll_ops.keyslot_evict(profile, key, -1);
375			blk_crypto_hw_exit(profile);
376			return err;
377		}
378		return 0;
379	}
380
381	blk_crypto_hw_enter(profile);
382	slot = blk_crypto_find_keyslot(profile, key);
383	if (!slot) {
384		/*
385		 * Not an error, since a key not in use by I/O is not guaranteed
386		 * to be in a keyslot.  There can be more keys than keyslots.
387		 */
388		err = 0;
389		goto out;
390	}
391
392	if (WARN_ON_ONCE(atomic_read(&slot->slot_refs) != 0)) {
393		/* BUG: key is still in use by I/O */
394		err = -EBUSY;
395		goto out_remove;
396	}
397	err = profile->ll_ops.keyslot_evict(profile, key,
398					    blk_crypto_keyslot_index(slot));
399out_remove:
400	/*
401	 * Callers free the key even on error, so unlink the key from the hash
402	 * table and clear slot->key even on error.
403	 */
404	hlist_del(&slot->hash_node);
405	slot->key = NULL;
406out:
407	blk_crypto_hw_exit(profile);
408	return err;
409}
410
411/**
412 * blk_crypto_reprogram_all_keys() - Re-program all keyslots.
413 * @profile: The crypto profile
414 *
415 * Re-program all keyslots that are supposed to have a key programmed.  This is
416 * intended only for use by drivers for hardware that loses its keys on reset.
417 *
418 * Context: Process context. Takes and releases profile->lock.
419 */
420void blk_crypto_reprogram_all_keys(struct blk_crypto_profile *profile)
421{
422	unsigned int slot;
423
424	if (profile->num_slots == 0)
425		return;
426
427	/* This is for device initialization, so don't resume the device */
428	down_write(&profile->lock);
429	for (slot = 0; slot < profile->num_slots; slot++) {
430		const struct blk_crypto_key *key = profile->slots[slot].key;
431		int err;
432
433		if (!key)
434			continue;
435
436		err = profile->ll_ops.keyslot_program(profile, key, slot);
437		WARN_ON(err);
438	}
439	up_write(&profile->lock);
440}
441EXPORT_SYMBOL_GPL(blk_crypto_reprogram_all_keys);
442
443void blk_crypto_profile_destroy(struct blk_crypto_profile *profile)
444{
445	if (!profile)
446		return;
447	lockdep_unregister_key(&profile->lockdep_key);
448	kvfree(profile->slot_hashtable);
449	kvfree_sensitive(profile->slots,
450			 sizeof(profile->slots[0]) * profile->num_slots);
451	memzero_explicit(profile, sizeof(*profile));
452}
453EXPORT_SYMBOL_GPL(blk_crypto_profile_destroy);
454
455bool blk_crypto_register(struct blk_crypto_profile *profile,
456			 struct request_queue *q)
457{
458	if (blk_integrity_queue_supports_integrity(q)) {
459		pr_warn("Integrity and hardware inline encryption are not supported together. Disabling hardware inline encryption.\n");
460		return false;
461	}
462	q->crypto_profile = profile;
463	return true;
464}
465EXPORT_SYMBOL_GPL(blk_crypto_register);
466
467/**
468 * blk_crypto_derive_sw_secret() - Derive software secret from wrapped key
469 * @bdev: a block device that supports hardware-wrapped keys
470 * @eph_key: a hardware-wrapped key in ephemerally-wrapped form
471 * @eph_key_size: size of @eph_key in bytes
472 * @sw_secret: (output) the software secret
473 *
474 * Given a hardware-wrapped key in ephemerally-wrapped form (the same form that
475 * it is used for I/O), ask the hardware to derive the secret which software can
476 * use for cryptographic tasks other than inline encryption.  This secret is
477 * guaranteed to be cryptographically isolated from the inline encryption key,
478 * i.e. derived with a different KDF context.
479 *
480 * Return: 0 on success, -EOPNOTSUPP if the block device doesn't support
481 *	   hardware-wrapped keys, -EBADMSG if the key isn't a valid
482 *	   ephemerally-wrapped key, or another -errno code.
483 */
484int blk_crypto_derive_sw_secret(struct block_device *bdev,
485				const u8 *eph_key, size_t eph_key_size,
486				u8 sw_secret[BLK_CRYPTO_SW_SECRET_SIZE])
487{
488	struct blk_crypto_profile *profile =
489		bdev_get_queue(bdev)->crypto_profile;
490	int err;
491
492	if (!profile)
493		return -EOPNOTSUPP;
494	if (!(profile->key_types_supported & BLK_CRYPTO_KEY_TYPE_HW_WRAPPED))
495		return -EOPNOTSUPP;
496	if (!profile->ll_ops.derive_sw_secret)
497		return -EOPNOTSUPP;
498	blk_crypto_hw_enter(profile);
499	err = profile->ll_ops.derive_sw_secret(profile, eph_key, eph_key_size,
500					       sw_secret);
501	blk_crypto_hw_exit(profile);
502	return err;
503}
504EXPORT_SYMBOL_GPL(blk_crypto_derive_sw_secret);
505
506int blk_crypto_import_key(struct blk_crypto_profile *profile,
507			  const u8 *raw_key, size_t raw_key_size,
508			  u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
509{
510	int ret;
511
512	if (!profile)
513		return -EOPNOTSUPP;
514	if (!(profile->key_types_supported & BLK_CRYPTO_KEY_TYPE_HW_WRAPPED))
515		return -EOPNOTSUPP;
516	if (!profile->ll_ops.import_key)
517		return -EOPNOTSUPP;
518	blk_crypto_hw_enter(profile);
519	ret = profile->ll_ops.import_key(profile, raw_key, raw_key_size,
520					 lt_key);
521	blk_crypto_hw_exit(profile);
522	return ret;
523}
524EXPORT_SYMBOL_GPL(blk_crypto_import_key);
525
526int blk_crypto_generate_key(struct blk_crypto_profile *profile,
527			    u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
528{
529	int ret;
530
531	if (!profile)
532		return -EOPNOTSUPP;
533	if (!(profile->key_types_supported & BLK_CRYPTO_KEY_TYPE_HW_WRAPPED))
534		return -EOPNOTSUPP;
535	if (!profile->ll_ops.generate_key)
536		return -EOPNOTSUPP;
537	blk_crypto_hw_enter(profile);
538	ret = profile->ll_ops.generate_key(profile, lt_key);
539	blk_crypto_hw_exit(profile);
540	return ret;
541}
542EXPORT_SYMBOL_GPL(blk_crypto_generate_key);
543
544int blk_crypto_prepare_key(struct blk_crypto_profile *profile,
545			   const u8 *lt_key, size_t lt_key_size,
546			   u8 eph_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
547{
548	int ret;
549
550	if (!profile)
551		return -EOPNOTSUPP;
552	if (!(profile->key_types_supported & BLK_CRYPTO_KEY_TYPE_HW_WRAPPED))
553		return -EOPNOTSUPP;
554	if (!profile->ll_ops.prepare_key)
555		return -EOPNOTSUPP;
556	blk_crypto_hw_enter(profile);
557	ret = profile->ll_ops.prepare_key(profile, lt_key, lt_key_size,
558					  eph_key);
559	blk_crypto_hw_exit(profile);
560	return ret;
561}
562EXPORT_SYMBOL_GPL(blk_crypto_prepare_key);
563
564/**
565 * blk_crypto_intersect_capabilities() - restrict supported crypto capabilities
566 *					 by child device
567 * @parent: the crypto profile for the parent device
568 * @child: the crypto profile for the child device, or NULL
569 *
570 * This clears all crypto capabilities in @parent that aren't set in @child.  If
571 * @child is NULL, then this clears all parent capabilities.
572 *
573 * Only use this when setting up the crypto profile for a layered device, before
574 * it's been exposed yet.
575 */
576void blk_crypto_intersect_capabilities(struct blk_crypto_profile *parent,
577				       const struct blk_crypto_profile *child)
578{
579	if (child) {
580		unsigned int i;
581
582		parent->max_dun_bytes_supported =
583			min(parent->max_dun_bytes_supported,
584			    child->max_dun_bytes_supported);
585		for (i = 0; i < ARRAY_SIZE(child->modes_supported); i++)
586			parent->modes_supported[i] &= child->modes_supported[i];
587		parent->key_types_supported &= child->key_types_supported;
588	} else {
589		parent->max_dun_bytes_supported = 0;
590		memset(parent->modes_supported, 0,
591		       sizeof(parent->modes_supported));
592		parent->key_types_supported = 0;
593	}
594}
595EXPORT_SYMBOL_GPL(blk_crypto_intersect_capabilities);
596
597/**
598 * blk_crypto_has_capabilities() - Check whether @target supports at least all
599 *				   the crypto capabilities that @reference does.
600 * @target: the target profile
601 * @reference: the reference profile
602 *
603 * Return: %true if @target supports all the crypto capabilities of @reference.
604 */
605bool blk_crypto_has_capabilities(const struct blk_crypto_profile *target,
606				 const struct blk_crypto_profile *reference)
607{
608	int i;
609
610	if (!reference)
611		return true;
612
613	if (!target)
614		return false;
615
616	for (i = 0; i < ARRAY_SIZE(target->modes_supported); i++) {
617		if (reference->modes_supported[i] & ~target->modes_supported[i])
618			return false;
619	}
620
621	if (reference->max_dun_bytes_supported >
622	    target->max_dun_bytes_supported)
623		return false;
624
625	if (reference->key_types_supported & ~target->key_types_supported)
626		return false;
627
628	return true;
629}
630EXPORT_SYMBOL_GPL(blk_crypto_has_capabilities);
631
632/**
633 * blk_crypto_update_capabilities() - Update the capabilities of a crypto
634 *				      profile to match those of another crypto
635 *				      profile.
636 * @dst: The crypto profile whose capabilities to update.
637 * @src: The crypto profile whose capabilities this function will update @dst's
638 *	 capabilities to.
639 *
640 * Blk-crypto requires that crypto capabilities that were
641 * advertised when a bio was created continue to be supported by the
642 * device until that bio is ended. This is turn means that a device cannot
643 * shrink its advertised crypto capabilities without any explicit
644 * synchronization with upper layers. So if there's no such explicit
645 * synchronization, @src must support all the crypto capabilities that
646 * @dst does (i.e. we need blk_crypto_has_capabilities(@src, @dst)).
647 *
648 * Note also that as long as the crypto capabilities are being expanded, the
649 * order of updates becoming visible is not important because it's alright
650 * for blk-crypto to see stale values - they only cause blk-crypto to
651 * believe that a crypto capability isn't supported when it actually is (which
652 * might result in blk-crypto-fallback being used if available, or the bio being
653 * failed).
654 */
655void blk_crypto_update_capabilities(struct blk_crypto_profile *dst,
656				    const struct blk_crypto_profile *src)
657{
658	memcpy(dst->modes_supported, src->modes_supported,
659	       sizeof(dst->modes_supported));
660
661	dst->max_dun_bytes_supported = src->max_dun_bytes_supported;
662	dst->key_types_supported = src->key_types_supported;
663}
664EXPORT_SYMBOL_GPL(blk_crypto_update_capabilities);