mirror of
https://github.com/koverstreet/bcachefs-tools.git
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134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
#ifndef _BCACHE_CHECKSUM_H
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#define _BCACHE_CHECKSUM_H
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#include "bcachefs.h"
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#include "super-io.h"
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#include <crypto/chacha20.h>
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u64 bch2_crc64_update(u64, const void *, size_t);
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#define BCH_NONCE_EXTENT cpu_to_le32(1 << 28)
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#define BCH_NONCE_BTREE cpu_to_le32(2 << 28)
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#define BCH_NONCE_JOURNAL cpu_to_le32(3 << 28)
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#define BCH_NONCE_PRIO cpu_to_le32(4 << 28)
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#define BCH_NONCE_POLY cpu_to_le32(1 << 31)
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struct bch_csum bch2_checksum(struct bch_fs *, unsigned, struct nonce,
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const void *, size_t);
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/*
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* This is used for various on disk data structures - bch_sb, prio_set, bset,
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* jset: The checksum is _always_ the first field of these structs
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*/
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#define csum_vstruct(_c, _type, _nonce, _i) \
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({ \
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const void *start = ((const void *) (_i)) + sizeof((_i)->csum); \
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const void *end = vstruct_end(_i); \
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\
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bch2_checksum(_c, _type, _nonce, start, end - start); \
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})
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int bch2_chacha_encrypt_key(struct bch_key *, struct nonce, void *, size_t);
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int bch2_request_key(struct bch_sb *, struct bch_key *);
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void bch2_encrypt(struct bch_fs *, unsigned, struct nonce,
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void *data, size_t);
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struct bch_csum bch2_checksum_bio(struct bch_fs *, unsigned,
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struct nonce, struct bio *);
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void bch2_encrypt_bio(struct bch_fs *, unsigned,
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struct nonce, struct bio *);
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int bch2_disable_encryption(struct bch_fs *);
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int bch2_enable_encryption(struct bch_fs *, bool);
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void bch2_fs_encryption_exit(struct bch_fs *);
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int bch2_fs_encryption_init(struct bch_fs *);
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static inline unsigned bch2_data_checksum_type(struct bch_fs *c)
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{
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if (c->sb.encryption_type)
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return c->opts.wide_macs
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? BCH_CSUM_CHACHA20_POLY1305_128
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: BCH_CSUM_CHACHA20_POLY1305_80;
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return c->opts.data_checksum;
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}
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static inline unsigned bch2_meta_checksum_type(struct bch_fs *c)
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{
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return c->sb.encryption_type
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? BCH_CSUM_CHACHA20_POLY1305_128
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: c->opts.metadata_checksum;
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}
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static inline bool bch2_checksum_type_valid(const struct bch_fs *c,
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unsigned type)
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{
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if (type >= BCH_CSUM_NR)
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return false;
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if (bch2_csum_type_is_encryption(type) && !c->chacha20)
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return false;
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return true;
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}
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static const unsigned bch_crc_bytes[] = {
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[BCH_CSUM_NONE] = 0,
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[BCH_CSUM_CRC32C] = 4,
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[BCH_CSUM_CRC64] = 8,
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[BCH_CSUM_CHACHA20_POLY1305_80] = 10,
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[BCH_CSUM_CHACHA20_POLY1305_128] = 16,
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};
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static inline bool bch2_crc_cmp(struct bch_csum l, struct bch_csum r)
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{
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/*
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* XXX: need some way of preventing the compiler from optimizing this
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* into a form that isn't constant time..
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*/
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return ((l.lo ^ r.lo) | (l.hi ^ r.hi)) != 0;
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}
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/* for skipping ahead and encrypting/decrypting at an offset: */
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static inline struct nonce nonce_add(struct nonce nonce, unsigned offset)
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{
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EBUG_ON(offset & (CHACHA20_BLOCK_SIZE - 1));
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le32_add_cpu(&nonce.d[0], offset / CHACHA20_BLOCK_SIZE);
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return nonce;
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}
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static inline bool bch2_key_is_encrypted(struct bch_encrypted_key *key)
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{
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return le64_to_cpu(key->magic) != BCH_KEY_MAGIC;
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}
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static inline struct nonce __bch2_sb_key_nonce(struct bch_sb *sb)
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{
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__le64 magic = __bch2_sb_magic(sb);
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return (struct nonce) {{
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[0] = 0,
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[1] = 0,
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[2] = ((__le32 *) &magic)[0],
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[3] = ((__le32 *) &magic)[1],
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}};
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}
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static inline struct nonce bch2_sb_key_nonce(struct bch_fs *c)
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{
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__le64 magic = bch2_sb_magic(c);
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return (struct nonce) {{
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[0] = 0,
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[1] = 0,
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[2] = ((__le32 *) &magic)[0],
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[3] = ((__le32 *) &magic)[1],
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}};
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}
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#endif /* _BCACHE_CHECKSUM_H */
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