mirror of
https://github.com/torvalds/linux.git
synced 2024-11-23 12:42:02 +00:00
0458a953d8
Replaced the use of a Variable Length Array In Struct (VLAIS) with a C99 compliant equivalent. This patch instead allocates the appropriate amount of memory using a char array using the SHASH_DESC_ON_STACK macro. The new code can be compiled with both gcc and clang. Signed-off-by: Vinícius Tinti <viniciustinti@gmail.com> Reviewed-by: Jan-Simon Möller <dl9pf@gmx.de> Reviewed-by: Mark Charlebois <charlebm@gmail.com> Signed-off-by: Behan Webster <behanw@converseincode.com> Acked-by: Chris Mason <clm@fb.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Cc: "David S. Miller" <davem@davemloft.net>
47 lines
1.0 KiB
C
47 lines
1.0 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)
|
|
{
|
|
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;
|
|
}
|