1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _BCACHEFS_CHECKSUM_H
3 #define _BCACHEFS_CHECKSUM_H
6 #include "extents_types.h"
9 #include <linux/crc64.h>
10 #include <crypto/chacha.h>
12 static inline bool bch2_checksum_mergeable(unsigned type)
25 struct bch_csum bch2_checksum_merge(unsigned, struct bch_csum,
26 struct bch_csum, size_t);
28 #define BCH_NONCE_EXTENT cpu_to_le32(1 << 28)
29 #define BCH_NONCE_BTREE cpu_to_le32(2 << 28)
30 #define BCH_NONCE_JOURNAL cpu_to_le32(3 << 28)
31 #define BCH_NONCE_PRIO cpu_to_le32(4 << 28)
32 #define BCH_NONCE_POLY cpu_to_le32(1 << 31)
34 struct bch_csum bch2_checksum(struct bch_fs *, unsigned, struct nonce,
35 const void *, size_t);
38 * This is used for various on disk data structures - bch_sb, prio_set, bset,
39 * jset: The checksum is _always_ the first field of these structs
41 #define csum_vstruct(_c, _type, _nonce, _i) \
43 const void *_start = ((const void *) (_i)) + sizeof((_i)->csum);\
45 bch2_checksum(_c, _type, _nonce, _start, vstruct_end(_i) - _start);\
48 int bch2_chacha_encrypt_key(struct bch_key *, struct nonce, void *, size_t);
49 int bch2_request_key(struct bch_sb *, struct bch_key *);
51 int bch2_revoke_key(struct bch_sb *);
54 int bch2_encrypt(struct bch_fs *, unsigned, struct nonce,
57 struct bch_csum bch2_checksum_bio(struct bch_fs *, unsigned,
58 struct nonce, struct bio *);
60 int bch2_rechecksum_bio(struct bch_fs *, struct bio *, struct bversion,
61 struct bch_extent_crc_unpacked,
62 struct bch_extent_crc_unpacked *,
63 struct bch_extent_crc_unpacked *,
64 unsigned, unsigned, unsigned);
66 int __bch2_encrypt_bio(struct bch_fs *, unsigned,
67 struct nonce, struct bio *);
69 static inline int bch2_encrypt_bio(struct bch_fs *c, unsigned type,
70 struct nonce nonce, struct bio *bio)
72 return bch2_csum_type_is_encryption(type)
73 ? __bch2_encrypt_bio(c, type, nonce, bio)
77 extern const struct bch_sb_field_ops bch_sb_field_ops_crypt;
79 int bch2_decrypt_sb_key(struct bch_fs *, struct bch_sb_field_crypt *,
82 int bch2_disable_encryption(struct bch_fs *);
83 int bch2_enable_encryption(struct bch_fs *, bool);
85 void bch2_fs_encryption_exit(struct bch_fs *);
86 int bch2_fs_encryption_init(struct bch_fs *);
88 static inline enum bch_csum_type bch2_csum_opt_to_type(enum bch_csum_opts type,
92 case BCH_CSUM_OPT_none:
94 case BCH_CSUM_OPT_crc32c:
95 return data ? BCH_CSUM_crc32c : BCH_CSUM_crc32c_nonzero;
96 case BCH_CSUM_OPT_crc64:
97 return data ? BCH_CSUM_crc64 : BCH_CSUM_crc64_nonzero;
98 case BCH_CSUM_OPT_xxhash:
99 return BCH_CSUM_xxhash;
105 static inline enum bch_csum_type bch2_data_checksum_type(struct bch_fs *c,
106 struct bch_io_opts opts)
111 if (c->sb.encryption_type)
112 return c->opts.wide_macs
113 ? BCH_CSUM_chacha20_poly1305_128
114 : BCH_CSUM_chacha20_poly1305_80;
116 return bch2_csum_opt_to_type(opts.data_checksum, true);
119 static inline enum bch_csum_type bch2_meta_checksum_type(struct bch_fs *c)
121 if (c->sb.encryption_type)
122 return BCH_CSUM_chacha20_poly1305_128;
124 return bch2_csum_opt_to_type(c->opts.metadata_checksum, false);
127 static inline bool bch2_checksum_type_valid(const struct bch_fs *c,
130 if (type >= BCH_CSUM_NR)
133 if (bch2_csum_type_is_encryption(type) && !c->chacha20)
139 /* returns true if not equal */
140 static inline bool bch2_crc_cmp(struct bch_csum l, struct bch_csum r)
143 * XXX: need some way of preventing the compiler from optimizing this
144 * into a form that isn't constant time..
146 return ((l.lo ^ r.lo) | (l.hi ^ r.hi)) != 0;
149 /* for skipping ahead and encrypting/decrypting at an offset: */
150 static inline struct nonce nonce_add(struct nonce nonce, unsigned offset)
152 EBUG_ON(offset & (CHACHA_BLOCK_SIZE - 1));
154 le32_add_cpu(&nonce.d[0], offset / CHACHA_BLOCK_SIZE);
158 static inline struct nonce null_nonce(void)
162 memset(&ret, 0, sizeof(ret));
166 static inline struct nonce extent_nonce(struct bversion version,
167 struct bch_extent_crc_unpacked crc)
169 unsigned compression_type = crc_is_compressed(crc)
170 ? crc.compression_type
172 unsigned size = compression_type ? crc.uncompressed_size : 0;
173 struct nonce nonce = (struct nonce) {{
174 [0] = cpu_to_le32(size << 22),
175 [1] = cpu_to_le32(version.lo),
176 [2] = cpu_to_le32(version.lo >> 32),
177 [3] = cpu_to_le32(version.hi|
178 (compression_type << 24))^BCH_NONCE_EXTENT,
181 return nonce_add(nonce, crc.nonce << 9);
184 static inline bool bch2_key_is_encrypted(struct bch_encrypted_key *key)
186 return le64_to_cpu(key->magic) != BCH_KEY_MAGIC;
189 static inline struct nonce __bch2_sb_key_nonce(struct bch_sb *sb)
191 __le64 magic = __bch2_sb_magic(sb);
193 return (struct nonce) {{
196 [2] = ((__le32 *) &magic)[0],
197 [3] = ((__le32 *) &magic)[1],
201 static inline struct nonce bch2_sb_key_nonce(struct bch_fs *c)
203 __le64 magic = bch2_sb_magic(c);
205 return (struct nonce) {{
208 [2] = ((__le32 *) &magic)[0],
209 [3] = ((__le32 *) &magic)[1],
213 #endif /* _BCACHEFS_CHECKSUM_H */