+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _BCACHEFS_CHECKSUM_H
-#define _BCACHEFS_CHECKSUM_H
-
-#include "bcachefs.h"
-#include "extents_types.h"
-#include "super-io.h"
-
-#include <linux/crc64.h>
-#include <crypto/chacha.h>
-
-static inline bool bch2_checksum_mergeable(unsigned type)
-{
-
- switch (type) {
- case BCH_CSUM_none:
- case BCH_CSUM_crc32c:
- case BCH_CSUM_crc64:
- return true;
- default:
- return false;
- }
-}
-
-struct bch_csum bch2_checksum_merge(unsigned, struct bch_csum,
- struct bch_csum, size_t);
-
-#define BCH_NONCE_EXTENT cpu_to_le32(1 << 28)
-#define BCH_NONCE_BTREE cpu_to_le32(2 << 28)
-#define BCH_NONCE_JOURNAL cpu_to_le32(3 << 28)
-#define BCH_NONCE_PRIO cpu_to_le32(4 << 28)
-#define BCH_NONCE_POLY cpu_to_le32(1 << 31)
-
-struct bch_csum bch2_checksum(struct bch_fs *, unsigned, struct nonce,
- const void *, size_t);
-
-/*
- * This is used for various on disk data structures - bch_sb, prio_set, bset,
- * jset: The checksum is _always_ the first field of these structs
- */
-#define csum_vstruct(_c, _type, _nonce, _i) \
-({ \
- const void *_start = ((const void *) (_i)) + sizeof((_i)->csum);\
- \
- bch2_checksum(_c, _type, _nonce, _start, vstruct_end(_i) - _start);\
-})
-
-static inline void bch2_csum_to_text(struct printbuf *out,
- enum bch_csum_type type,
- struct bch_csum csum)
-{
- const u8 *p = (u8 *) &csum;
- unsigned bytes = type < BCH_CSUM_NR ? bch_crc_bytes[type] : 16;
-
- for (unsigned i = 0; i < bytes; i++)
- prt_hex_byte(out, p[i]);
-}
-
-static inline void bch2_csum_err_msg(struct printbuf *out,
- enum bch_csum_type type,
- struct bch_csum expected,
- struct bch_csum got)
-{
- prt_printf(out, "checksum error: got ");
- bch2_csum_to_text(out, type, got);
- prt_str(out, " should be ");
- bch2_csum_to_text(out, type, expected);
- prt_printf(out, " type %s", bch2_csum_types[type]);
-}
-
-int bch2_chacha_encrypt_key(struct bch_key *, struct nonce, void *, size_t);
-int bch2_request_key(struct bch_sb *, struct bch_key *);
-#ifndef __KERNEL__
-int bch2_revoke_key(struct bch_sb *);
-#endif
-
-int bch2_encrypt(struct bch_fs *, unsigned, struct nonce,
- void *data, size_t);
-
-struct bch_csum bch2_checksum_bio(struct bch_fs *, unsigned,
- struct nonce, struct bio *);
-
-int bch2_rechecksum_bio(struct bch_fs *, struct bio *, struct bversion,
- struct bch_extent_crc_unpacked,
- struct bch_extent_crc_unpacked *,
- struct bch_extent_crc_unpacked *,
- unsigned, unsigned, unsigned);
-
-int __bch2_encrypt_bio(struct bch_fs *, unsigned,
- struct nonce, struct bio *);
-
-static inline int bch2_encrypt_bio(struct bch_fs *c, unsigned type,
- struct nonce nonce, struct bio *bio)
-{
- return bch2_csum_type_is_encryption(type)
- ? __bch2_encrypt_bio(c, type, nonce, bio)
- : 0;
-}
-
-extern const struct bch_sb_field_ops bch_sb_field_ops_crypt;
-
-int bch2_decrypt_sb_key(struct bch_fs *, struct bch_sb_field_crypt *,
- struct bch_key *);
-
-int bch2_disable_encryption(struct bch_fs *);
-int bch2_enable_encryption(struct bch_fs *, bool);
-
-void bch2_fs_encryption_exit(struct bch_fs *);
-int bch2_fs_encryption_init(struct bch_fs *);
-
-static inline enum bch_csum_type bch2_csum_opt_to_type(enum bch_csum_opts type,
- bool data)
-{
- switch (type) {
- case BCH_CSUM_OPT_none:
- return BCH_CSUM_none;
- case BCH_CSUM_OPT_crc32c:
- return data ? BCH_CSUM_crc32c : BCH_CSUM_crc32c_nonzero;
- case BCH_CSUM_OPT_crc64:
- return data ? BCH_CSUM_crc64 : BCH_CSUM_crc64_nonzero;
- case BCH_CSUM_OPT_xxhash:
- return BCH_CSUM_xxhash;
- default:
- BUG();
- }
-}
-
-static inline enum bch_csum_type bch2_data_checksum_type(struct bch_fs *c,
- struct bch_io_opts opts)
-{
- if (opts.nocow)
- return 0;
-
- if (c->sb.encryption_type)
- return c->opts.wide_macs
- ? BCH_CSUM_chacha20_poly1305_128
- : BCH_CSUM_chacha20_poly1305_80;
-
- return bch2_csum_opt_to_type(opts.data_checksum, true);
-}
-
-static inline enum bch_csum_type bch2_meta_checksum_type(struct bch_fs *c)
-{
- if (c->sb.encryption_type)
- return BCH_CSUM_chacha20_poly1305_128;
-
- return bch2_csum_opt_to_type(c->opts.metadata_checksum, false);
-}
-
-static inline bool bch2_checksum_type_valid(const struct bch_fs *c,
- unsigned type)
-{
- if (type >= BCH_CSUM_NR)
- return false;
-
- if (bch2_csum_type_is_encryption(type) && !c->chacha20)
- return false;
-
- return true;
-}
-
-/* returns true if not equal */
-static inline bool bch2_crc_cmp(struct bch_csum l, struct bch_csum r)
-{
- /*
- * XXX: need some way of preventing the compiler from optimizing this
- * into a form that isn't constant time..
- */
- return ((l.lo ^ r.lo) | (l.hi ^ r.hi)) != 0;
-}
-
-/* for skipping ahead and encrypting/decrypting at an offset: */
-static inline struct nonce nonce_add(struct nonce nonce, unsigned offset)
-{
- EBUG_ON(offset & (CHACHA_BLOCK_SIZE - 1));
-
- le32_add_cpu(&nonce.d[0], offset / CHACHA_BLOCK_SIZE);
- return nonce;
-}
-
-static inline struct nonce null_nonce(void)
-{
- struct nonce ret;
-
- memset(&ret, 0, sizeof(ret));
- return ret;
-}
-
-static inline struct nonce extent_nonce(struct bversion version,
- struct bch_extent_crc_unpacked crc)
-{
- unsigned compression_type = crc_is_compressed(crc)
- ? crc.compression_type
- : 0;
- unsigned size = compression_type ? crc.uncompressed_size : 0;
- struct nonce nonce = (struct nonce) {{
- [0] = cpu_to_le32(size << 22),
- [1] = cpu_to_le32(version.lo),
- [2] = cpu_to_le32(version.lo >> 32),
- [3] = cpu_to_le32(version.hi|
- (compression_type << 24))^BCH_NONCE_EXTENT,
- }};
-
- return nonce_add(nonce, crc.nonce << 9);
-}
-
-static inline bool bch2_key_is_encrypted(struct bch_encrypted_key *key)
-{
- return le64_to_cpu(key->magic) != BCH_KEY_MAGIC;
-}
-
-static inline struct nonce __bch2_sb_key_nonce(struct bch_sb *sb)
-{
- __le64 magic = __bch2_sb_magic(sb);
-
- return (struct nonce) {{
- [0] = 0,
- [1] = 0,
- [2] = ((__le32 *) &magic)[0],
- [3] = ((__le32 *) &magic)[1],
- }};
-}
-
-static inline struct nonce bch2_sb_key_nonce(struct bch_fs *c)
-{
- __le64 magic = bch2_sb_magic(c);
-
- return (struct nonce) {{
- [0] = 0,
- [1] = 0,
- [2] = ((__le32 *) &magic)[0],
- [3] = ((__le32 *) &magic)[1],
- }};
-}
-
-#endif /* _BCACHEFS_CHECKSUM_H */
projects / bcachefs-tools-debian / blobdiff