Release 4.7 drivers/md/dm-verity.h

/*
 * Copyright (C) 2012 Red Hat, Inc.
 * Copyright (C) 2015 Google, Inc.
 *
 * Author: Mikulas Patocka <mpatocka@redhat.com>
 *
 * Based on Chromium dm-verity driver (C) 2011 The Chromium OS Authors
 *
 * This file is released under the GPLv2.
 */

#ifndef DM_VERITY_H

#define DM_VERITY_H

#include "dm-bufio.h"
#include <linux/device-mapper.h>
#include <crypto/hash.h>


#define DM_VERITY_MAX_LEVELS		63


enum verity_mode {
	
DM_VERITY_MODE_EIO,
	
DM_VERITY_MODE_LOGGING,
	
DM_VERITY_MODE_RESTART
};


enum verity_block_type {
	
DM_VERITY_BLOCK_TYPE_DATA,
	
DM_VERITY_BLOCK_TYPE_METADATA
};

struct dm_verity_fec;


struct dm_verity {
	
struct dm_dev *data_dev;
	
struct dm_dev *hash_dev;
	
struct dm_target *ti;
	
struct dm_bufio_client *bufio;
	
char *alg_name;
	
struct crypto_shash *tfm;
	
u8 *root_digest;	/* digest of the root block */
	
u8 *salt;		/* salt: its size is salt_size */
	
u8 *zero_digest;	/* digest for a zero block */
	
unsigned salt_size;
	
sector_t data_start;	/* data offset in 512-byte sectors */
	
sector_t hash_start;	/* hash start in blocks */
	
sector_t data_blocks;	/* the number of data blocks */
	
sector_t hash_blocks;	/* the number of hash blocks */
	
unsigned char data_dev_block_bits;	/* log2(data blocksize) */
	
unsigned char hash_dev_block_bits;	/* log2(hash blocksize) */
	
unsigned char hash_per_block_bits;	/* log2(hashes in hash block) */
	
unsigned char levels;	/* the number of tree levels */
	
unsigned char version;
	
unsigned digest_size;	/* digest size for the current hash algorithm */
	
unsigned shash_descsize;/* the size of temporary space for crypto */
	
int hash_failed;	/* set to 1 if hash of any block failed */
	
enum verity_mode mode;	/* mode for handling verification errors */
	
unsigned corrupted_errs;/* Number of errors for corrupted blocks */

	
struct workqueue_struct *verify_wq;

	/* starting blocks for each tree level. 0 is the lowest level. */
	
sector_t hash_level_block[DM_VERITY_MAX_LEVELS];

	
struct dm_verity_fec *fec;	/* forward error correction */
};


struct dm_verity_io {
	
struct dm_verity *v;

	/* original value of bio->bi_end_io */
	
bio_end_io_t *orig_bi_end_io;

	
sector_t block;
	
unsigned n_blocks;

	
struct bvec_iter iter;

	
struct work_struct work;

	/*
         * Three variably-size fields follow this struct:
         *
         * u8 hash_desc[v->shash_descsize];
         * u8 real_digest[v->digest_size];
         * u8 want_digest[v->digest_size];
         *
         * To access them use: verity_io_hash_desc(), verity_io_real_digest()
         * and verity_io_want_digest().
         */
};



static inline struct shash_desc *verity_io_hash_desc(struct dm_verity *v,
						     struct dm_verity_io *io)
{
	return (struct shash_desc *)(io + 1);
}

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static inline u8 *verity_io_real_digest(struct dm_verity *v,
					struct dm_verity_io *io)
{
	return (u8 *)(io + 1) + v->shash_descsize;
}

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static inline u8 *verity_io_want_digest(struct dm_verity *v,
					struct dm_verity_io *io)
{
	return (u8 *)(io + 1) + v->shash_descsize + v->digest_size;
}

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static inline u8 *verity_io_digest_end(struct dm_verity *v,
				       struct dm_verity_io *io)
{
	return verity_io_want_digest(v, io) + v->digest_size;
}

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extern int verity_for_bv_block(struct dm_verity *v, struct dm_verity_io *io,
			       struct bvec_iter *iter,
			       int (*process)(struct dm_verity *v,
					      struct dm_verity_io *io,
					      u8 *data, size_t len));

extern int verity_hash(struct dm_verity *v, struct shash_desc *desc,
		       const u8 *data, size_t len, u8 *digest);

extern int verity_hash_for_block(struct dm_verity *v, struct dm_verity_io *io,
				 sector_t block, u8 *digest, bool *is_zero);

#endif /* DM_VERITY_H */
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Directory: drivers/md

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