6f84e23646
replace IS_ERR/PTR_ERR Cc: Chris Mason <clm@fb.com> Cc: Josef Bacik <jbacik@fb.com> Cc: linux-btrfs@vger.kernel.org Signed-off-by: Fabian Frederick <fabf@skynet.be> Signed-off-by: Chris Mason <clm@fb.com>
49 lines
1.1 KiB
C
49 lines
1.1 KiB
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);
|
|
}
|
|
|
|
void btrfs_hash_exit(void)
|
|
{
|
|
crypto_free_shash(tfm);
|
|
}
|
|
|
|
u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length)
|
|
{
|
|
struct {
|
|
struct shash_desc shash;
|
|
char ctx[crypto_shash_descsize(tfm)];
|
|
} desc;
|
|
int err;
|
|
|
|
desc.shash.tfm = tfm;
|
|
desc.shash.flags = 0;
|
|
*(u32 *)desc.ctx = crc;
|
|
|
|
err = crypto_shash_update(&desc.shash, address, length);
|
|
BUG_ON(err);
|
|
|
|
return *(u32 *)desc.ctx;
|
|
}
|