Release 4.11 fs/btrfs/hash.c

/*
 * Copyright (C) 2014 Filipe David Borba Manana <fdmanana@gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */

#include <crypto/hash.h>
#include <linux/err.h>
#include "hash.h"


static struct crypto_shash *tfm;



int __init btrfs_hash_init(void)
{
	tfm = crypto_alloc_shash("crc32c", 0, 0);

	return PTR_ERR_OR_ZERO(tfm);
}

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Filipe David Borba Manana
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1
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1
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25
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2
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const char* btrfs_crc32c_impl(void)
{
	return crypto_tfm_alg_driver_name(crypto_shash_tfm(tfm));
}

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void btrfs_hash_exit(void)
{
	crypto_free_shash(tfm);
}

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u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length)
{
	SHASH_DESC_ON_STACK(shash, tfm);
	u32 *ctx = (u32 *)shash_desc_ctx(shash);
	int err;

	shash->tfm = tfm;
	shash->flags = 0;
	*ctx = crc;

	err = crypto_shash_update(shash, address, length);
	BUG_ON(err);

	return *ctx;
}
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CommitProp
Filipe David Borba Manana
60
77.92%
1
50.00%
Vinícius Tinti
17
22.08%
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77
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Filipe David Borba Manana
112
75.68%
1
25.00%
Jeff Mahoney
18
12.16%
1
25.00%
Vinícius Tinti
17
11.49%
1
25.00%
Fabian Frederick
1
0.68%
1
25.00%
Total
148
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4
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Directory: fs/btrfs

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