1 #ifndef _BCACHEFS_CHECKSUM_H
2 #define _BCACHEFS_CHECKSUM_H
5 #include "extents_types.h"
8 #include <linux/crc64.h>
9 #include <crypto/chacha20.h>
11 static inline u64 bch2_crc64_update(u64 crc, const void *p, size_t len)
13 return crc64_be(crc, p, len);
16 #define BCH_NONCE_EXTENT cpu_to_le32(1 << 28)
17 #define BCH_NONCE_BTREE cpu_to_le32(2 << 28)
18 #define BCH_NONCE_JOURNAL cpu_to_le32(3 << 28)
19 #define BCH_NONCE_PRIO cpu_to_le32(4 << 28)
20 #define BCH_NONCE_POLY cpu_to_le32(1 << 31)
22 struct bch_csum bch2_checksum(struct bch_fs *, unsigned, struct nonce,
23 const void *, size_t);
26 * This is used for various on disk data structures - bch_sb, prio_set, bset,
27 * jset: The checksum is _always_ the first field of these structs
29 #define csum_vstruct(_c, _type, _nonce, _i) \
31 const void *start = ((const void *) (_i)) + sizeof((_i)->csum); \
32 const void *end = vstruct_end(_i); \
34 bch2_checksum(_c, _type, _nonce, start, end - start); \
37 int bch2_chacha_encrypt_key(struct bch_key *, struct nonce, void *, size_t);
38 int bch2_request_key(struct bch_sb *, struct bch_key *);
40 void bch2_encrypt(struct bch_fs *, unsigned, struct nonce,
43 struct bch_csum bch2_checksum_bio(struct bch_fs *, unsigned,
44 struct nonce, struct bio *);
46 int bch2_rechecksum_bio(struct bch_fs *, struct bio *, struct bversion,
47 struct bch_extent_crc_unpacked,
48 struct bch_extent_crc_unpacked *,
49 struct bch_extent_crc_unpacked *,
50 unsigned, unsigned, unsigned);
52 void bch2_encrypt_bio(struct bch_fs *, unsigned,
53 struct nonce, struct bio *);
55 int bch2_decrypt_sb_key(struct bch_fs *, struct bch_sb_field_crypt *,
58 int bch2_disable_encryption(struct bch_fs *);
59 int bch2_enable_encryption(struct bch_fs *, bool);
61 void bch2_fs_encryption_exit(struct bch_fs *);
62 int bch2_fs_encryption_init(struct bch_fs *);
64 static inline enum bch_csum_type bch2_csum_opt_to_type(enum bch_csum_opts type,
68 case BCH_CSUM_OPT_NONE:
70 case BCH_CSUM_OPT_CRC32C:
71 return data ? BCH_CSUM_CRC32C : BCH_CSUM_CRC32C_NONZERO;
72 case BCH_CSUM_OPT_CRC64:
73 return data ? BCH_CSUM_CRC64 : BCH_CSUM_CRC64_NONZERO;
79 static inline enum bch_csum_type bch2_data_checksum_type(struct bch_fs *c,
82 if (c->sb.encryption_type)
83 return c->opts.wide_macs
84 ? BCH_CSUM_CHACHA20_POLY1305_128
85 : BCH_CSUM_CHACHA20_POLY1305_80;
87 return bch2_csum_opt_to_type(opt, true);
90 static inline enum bch_csum_type bch2_meta_checksum_type(struct bch_fs *c)
92 if (c->sb.encryption_type)
93 return BCH_CSUM_CHACHA20_POLY1305_128;
95 return bch2_csum_opt_to_type(c->opts.metadata_checksum, false);
98 static const unsigned bch2_compression_opt_to_type[] = {
99 #define x(t) [BCH_COMPRESSION_OPT_##t] = BCH_COMPRESSION_##t,
100 BCH_COMPRESSION_TYPES()
104 static inline bool bch2_checksum_type_valid(const struct bch_fs *c,
107 if (type >= BCH_CSUM_NR)
110 if (bch2_csum_type_is_encryption(type) && !c->chacha20)
116 /* returns true if not equal */
117 static inline bool bch2_crc_cmp(struct bch_csum l, struct bch_csum r)
120 * XXX: need some way of preventing the compiler from optimizing this
121 * into a form that isn't constant time..
123 return ((l.lo ^ r.lo) | (l.hi ^ r.hi)) != 0;
126 /* for skipping ahead and encrypting/decrypting at an offset: */
127 static inline struct nonce nonce_add(struct nonce nonce, unsigned offset)
129 EBUG_ON(offset & (CHACHA20_BLOCK_SIZE - 1));
131 le32_add_cpu(&nonce.d[0], offset / CHACHA20_BLOCK_SIZE);
135 static inline struct nonce null_nonce(void)
139 memset(&ret, 0, sizeof(ret));
143 static inline struct nonce extent_nonce(struct bversion version,
144 struct bch_extent_crc_unpacked crc)
146 unsigned size = crc.compression_type ? crc.uncompressed_size : 0;
147 struct nonce nonce = (struct nonce) {{
148 [0] = cpu_to_le32(size << 22),
149 [1] = cpu_to_le32(version.lo),
150 [2] = cpu_to_le32(version.lo >> 32),
151 [3] = cpu_to_le32(version.hi|
152 (crc.compression_type << 24))^BCH_NONCE_EXTENT,
155 return nonce_add(nonce, crc.nonce << 9);
158 static inline bool bch2_key_is_encrypted(struct bch_encrypted_key *key)
160 return le64_to_cpu(key->magic) != BCH_KEY_MAGIC;
163 static inline struct nonce __bch2_sb_key_nonce(struct bch_sb *sb)
165 __le64 magic = __bch2_sb_magic(sb);
167 return (struct nonce) {{
170 [2] = ((__le32 *) &magic)[0],
171 [3] = ((__le32 *) &magic)[1],
175 static inline struct nonce bch2_sb_key_nonce(struct bch_fs *c)
177 __le64 magic = bch2_sb_magic(c);
179 return (struct nonce) {{
182 [2] = ((__le32 *) &magic)[0],
183 [3] = ((__le32 *) &magic)[1],
187 #endif /* _BCACHEFS_CHECKSUM_H */