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https://github.com/torvalds/linux.git
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9abb6dd7ce
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
238 lines
5.9 KiB
C
238 lines
5.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_CHECKSUM_H
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#define _BCACHEFS_CHECKSUM_H
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#include "bcachefs.h"
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#include "extents_types.h"
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#include "super-io.h"
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#include <linux/crc64.h>
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#include <crypto/chacha.h>
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static inline bool bch2_checksum_mergeable(unsigned type)
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{
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switch (type) {
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case BCH_CSUM_none:
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case BCH_CSUM_crc32c:
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case BCH_CSUM_crc64:
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return true;
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default:
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return false;
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}
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}
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struct bch_csum bch2_checksum_merge(unsigned, struct bch_csum,
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struct bch_csum, 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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\
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bch2_checksum(_c, _type, _nonce, _start, vstruct_end(_i) - _start);\
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})
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static inline void bch2_csum_to_text(struct printbuf *out,
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enum bch_csum_type type,
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struct bch_csum csum)
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{
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const u8 *p = (u8 *) &csum;
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unsigned bytes = type < BCH_CSUM_NR ? bch_crc_bytes[type] : 16;
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for (unsigned i = 0; i < bytes; i++)
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prt_hex_byte(out, p[i]);
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}
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static inline void bch2_csum_err_msg(struct printbuf *out,
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enum bch_csum_type type,
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struct bch_csum expected,
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struct bch_csum got)
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{
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prt_str(out, "checksum error, type ");
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bch2_prt_csum_type(out, type);
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prt_str(out, ": got ");
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bch2_csum_to_text(out, type, got);
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prt_str(out, " should be ");
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bch2_csum_to_text(out, type, expected);
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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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#ifndef __KERNEL__
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int bch2_revoke_key(struct bch_sb *);
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#endif
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int 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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int bch2_rechecksum_bio(struct bch_fs *, struct bio *, struct bversion,
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struct bch_extent_crc_unpacked,
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struct bch_extent_crc_unpacked *,
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struct bch_extent_crc_unpacked *,
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unsigned, unsigned, unsigned);
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int __bch2_encrypt_bio(struct bch_fs *, unsigned,
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struct nonce, struct bio *);
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static inline int bch2_encrypt_bio(struct bch_fs *c, unsigned type,
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struct nonce nonce, struct bio *bio)
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{
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return bch2_csum_type_is_encryption(type)
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? __bch2_encrypt_bio(c, type, nonce, bio)
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: 0;
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}
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extern const struct bch_sb_field_ops bch_sb_field_ops_crypt;
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int bch2_decrypt_sb_key(struct bch_fs *, struct bch_sb_field_crypt *,
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struct bch_key *);
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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 enum bch_csum_type bch2_csum_opt_to_type(enum bch_csum_opts type,
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bool data)
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{
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switch (type) {
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case BCH_CSUM_OPT_none:
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return BCH_CSUM_none;
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case BCH_CSUM_OPT_crc32c:
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return data ? BCH_CSUM_crc32c : BCH_CSUM_crc32c_nonzero;
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case BCH_CSUM_OPT_crc64:
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return data ? BCH_CSUM_crc64 : BCH_CSUM_crc64_nonzero;
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case BCH_CSUM_OPT_xxhash:
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return BCH_CSUM_xxhash;
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default:
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BUG();
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}
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}
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static inline enum bch_csum_type bch2_data_checksum_type(struct bch_fs *c,
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struct bch_io_opts opts)
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{
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if (opts.nocow)
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return 0;
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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 bch2_csum_opt_to_type(opts.data_checksum, true);
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}
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static inline enum bch_csum_type bch2_meta_checksum_type(struct bch_fs *c)
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{
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if (c->sb.encryption_type)
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return BCH_CSUM_chacha20_poly1305_128;
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return bch2_csum_opt_to_type(c->opts.metadata_checksum, false);
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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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/* returns true if not equal */
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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 & (CHACHA_BLOCK_SIZE - 1));
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le32_add_cpu(&nonce.d[0], offset / CHACHA_BLOCK_SIZE);
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return nonce;
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}
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static inline struct nonce null_nonce(void)
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{
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struct nonce ret;
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memset(&ret, 0, sizeof(ret));
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return ret;
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}
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static inline struct nonce extent_nonce(struct bversion version,
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struct bch_extent_crc_unpacked crc)
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{
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unsigned compression_type = crc_is_compressed(crc)
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? crc.compression_type
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: 0;
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unsigned size = compression_type ? crc.uncompressed_size : 0;
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struct nonce nonce = (struct nonce) {{
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[0] = cpu_to_le32(size << 22),
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[1] = cpu_to_le32(version.lo),
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[2] = cpu_to_le32(version.lo >> 32),
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[3] = cpu_to_le32(version.hi|
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(compression_type << 24))^BCH_NONCE_EXTENT,
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}};
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return nonce_add(nonce, crc.nonce << 9);
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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 /* _BCACHEFS_CHECKSUM_H */
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