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hc
2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c 
 kernel/block/blk-crypto-internal.h
....@@ -7,6 +7,7 @@
77 #define __LINUX_BLK_CRYPTO_INTERNAL_H
88 
99 #include <linux/bio.h>
10
+#include <linux/blkdev.h>
1011 
1112 /* Represents a crypto mode supported by blk-crypto  */
1213 struct blk_crypto_mode {
....@@ -17,17 +18,172 @@
1718 
1819 extern const struct blk_crypto_mode blk_crypto_modes[];
1920 
21
+#ifdef CONFIG_BLK_INLINE_ENCRYPTION
22
+
23
+void bio_crypt_dun_increment(u64 dun[BLK_CRYPTO_DUN_ARRAY_SIZE],
24
+			     unsigned int inc);
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+
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+bool bio_crypt_rq_ctx_compatible(struct request *rq, struct bio *bio);
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+
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+bool bio_crypt_ctx_mergeable(struct bio_crypt_ctx *bc1, unsigned int bc1_bytes,
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+			     struct bio_crypt_ctx *bc2);
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+
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+static inline bool bio_crypt_ctx_back_mergeable(struct request *req,
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+						struct bio *bio)
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+{
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+	return bio_crypt_ctx_mergeable(req->crypt_ctx, blk_rq_bytes(req),
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+				       bio->bi_crypt_context);
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+}
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+
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+static inline bool bio_crypt_ctx_front_mergeable(struct request *req,
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+						 struct bio *bio)
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+{
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+	return bio_crypt_ctx_mergeable(bio->bi_crypt_context,
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+				       bio->bi_iter.bi_size, req->crypt_ctx);
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+}
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+
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+static inline bool bio_crypt_ctx_merge_rq(struct request *req,
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+					  struct request *next)
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+{
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+	return bio_crypt_ctx_mergeable(req->crypt_ctx, blk_rq_bytes(req),
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+				       next->crypt_ctx);
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+}
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+
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+static inline void blk_crypto_rq_set_defaults(struct request *rq)
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+{
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+	rq->crypt_ctx = NULL;
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+	rq->crypt_keyslot = NULL;
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+}
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+
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+static inline bool blk_crypto_rq_is_encrypted(struct request *rq)
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+{
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+	return rq->crypt_ctx;
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+}
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+
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+#else /* CONFIG_BLK_INLINE_ENCRYPTION */
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+
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+static inline bool bio_crypt_rq_ctx_compatible(struct request *rq,
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+					       struct bio *bio)
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+{
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+	return true;
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+}
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+
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+static inline bool bio_crypt_ctx_front_mergeable(struct request *req,
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+						 struct bio *bio)
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+{
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+	return true;
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+}
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+
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+static inline bool bio_crypt_ctx_back_mergeable(struct request *req,
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+						struct bio *bio)
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+{
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+	return true;
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+}
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+
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+static inline bool bio_crypt_ctx_merge_rq(struct request *req,
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+					  struct request *next)
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+{
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+	return true;
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+}
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+
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+static inline void blk_crypto_rq_set_defaults(struct request *rq) { }
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+
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+static inline bool blk_crypto_rq_is_encrypted(struct request *rq)
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+{
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+	return false;
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+}
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+
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+#endif /* CONFIG_BLK_INLINE_ENCRYPTION */
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+
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+void __bio_crypt_advance(struct bio *bio, unsigned int bytes);
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+static inline void bio_crypt_advance(struct bio *bio, unsigned int bytes)
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+{
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+	if (bio_has_crypt_ctx(bio))
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+		__bio_crypt_advance(bio, bytes);
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+}
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+
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+void __bio_crypt_free_ctx(struct bio *bio);
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+static inline void bio_crypt_free_ctx(struct bio *bio)
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+{
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+	if (bio_has_crypt_ctx(bio))
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+		__bio_crypt_free_ctx(bio);
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+}
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+
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+static inline void bio_crypt_do_front_merge(struct request *rq,
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+					    struct bio *bio)
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+{
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+#ifdef CONFIG_BLK_INLINE_ENCRYPTION
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+	if (bio_has_crypt_ctx(bio))
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+		memcpy(rq->crypt_ctx->bc_dun, bio->bi_crypt_context->bc_dun,
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+		       sizeof(rq->crypt_ctx->bc_dun));
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+#endif
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+}
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+
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+bool __blk_crypto_bio_prep(struct bio **bio_ptr);
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+static inline bool blk_crypto_bio_prep(struct bio **bio_ptr)
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+{
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+	if (bio_has_crypt_ctx(*bio_ptr))
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+		return __blk_crypto_bio_prep(bio_ptr);
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+	return true;
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+}
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+
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+blk_status_t __blk_crypto_init_request(struct request *rq);
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+static inline blk_status_t blk_crypto_init_request(struct request *rq)
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+{
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+	if (blk_crypto_rq_is_encrypted(rq))
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+		return __blk_crypto_init_request(rq);
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+	return BLK_STS_OK;
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+}
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+
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+void __blk_crypto_free_request(struct request *rq);
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+static inline void blk_crypto_free_request(struct request *rq)
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+{
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+	if (blk_crypto_rq_is_encrypted(rq))
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+		__blk_crypto_free_request(rq);
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+}
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+
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+int __blk_crypto_rq_bio_prep(struct request *rq, struct bio *bio,
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+			     gfp_t gfp_mask);
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+/**
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+ * blk_crypto_rq_bio_prep - Prepare a request's crypt_ctx when its first bio
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+ *			    is inserted
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+ * @rq: The request to prepare
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+ * @bio: The first bio being inserted into the request
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+ * @gfp_mask: Memory allocation flags
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+ *
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+ * Return: 0 on success, -ENOMEM if out of memory.  -ENOMEM is only possible if
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+ *	   @gfp_mask doesn't include %__GFP_DIRECT_RECLAIM.
156
+ */
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+static inline int blk_crypto_rq_bio_prep(struct request *rq, struct bio *bio,
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+					 gfp_t gfp_mask)
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+{
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+	if (bio_has_crypt_ctx(bio))
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+		return __blk_crypto_rq_bio_prep(rq, bio, gfp_mask);
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+	return 0;
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+}
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+
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+/**
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+ * blk_crypto_insert_cloned_request - Prepare a cloned request to be inserted
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+ *				      into a request queue.
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+ * @rq: the request being queued
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+ *
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+ * Return: BLK_STS_OK on success, nonzero on error.
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+ */
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+static inline blk_status_t blk_crypto_insert_cloned_request(struct request *rq)
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+{
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+
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+	if (blk_crypto_rq_is_encrypted(rq))
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+		return blk_crypto_init_request(rq);
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+	return BLK_STS_OK;
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+}
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+
20180 #ifdef CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK
21181 
22182 int blk_crypto_fallback_start_using_mode(enum blk_crypto_mode_num mode_num);
23183 
24
-int blk_crypto_fallback_submit_bio(struct bio **bio_ptr);
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-
26
-bool blk_crypto_queue_decrypt_bio(struct bio *bio);
184
+bool blk_crypto_fallback_bio_prep(struct bio **bio_ptr);
27185 
28186 int blk_crypto_fallback_evict_key(const struct blk_crypto_key *key);
29
-
30
-bool bio_crypt_fallback_crypted(const struct bio_crypt_ctx *bc);
31187 
32188 #else /* CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK */
33189 
....@@ -38,21 +194,10 @@
38194 	return -ENOPKG;
39195 }
40196 
41
-static inline bool bio_crypt_fallback_crypted(const struct bio_crypt_ctx *bc)
197
+static inline bool blk_crypto_fallback_bio_prep(struct bio **bio_ptr)
42198 {
43
-	return false;
44
-}
45
-
46
-static inline int blk_crypto_fallback_submit_bio(struct bio **bio_ptr)
47
-{
48
-	pr_warn_once("crypto API fallback disabled; failing request\n");
199
+	pr_warn_once("crypto API fallback disabled; failing request.\n");
49200 	(*bio_ptr)->bi_status = BLK_STS_NOTSUPP;
50
-	return -EIO;
51
-}
52
-
53
-static inline bool blk_crypto_queue_decrypt_bio(struct bio *bio)
54
-{
55
-	WARN_ON(1);
56201 	return false;
57202 }
58203