Revision f9ebd61855253078fe8b07bacaf516337f8078e8 authored by Anna Schumaker on 15 April 2015, 17:00:04 UTC, committed by Trond Myklebust on 23 April 2015, 19:16:13 UTC
The idmapper is completely internal to the NFS v4 module, so this macro will always evaluate to true. This patch also removes unnecessary includes of this file from the generic NFS client. Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
1 parent 7c61f0d
842.c
/*
* Cryptographic API for the 842 compression algorithm.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright (C) IBM Corporation, 2011
*
* Authors: Robert Jennings <rcj@linux.vnet.ibm.com>
* Seth Jennings <sjenning@linux.vnet.ibm.com>
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/vmalloc.h>
#include <linux/nx842.h>
#include <linux/lzo.h>
#include <linux/timer.h>
static int nx842_uselzo;
struct nx842_ctx {
void *nx842_wmem; /* working memory for 842/lzo */
};
enum nx842_crypto_type {
NX842_CRYPTO_TYPE_842,
NX842_CRYPTO_TYPE_LZO
};
#define NX842_SENTINEL 0xdeadbeef
struct nx842_crypto_header {
unsigned int sentinel; /* debug */
enum nx842_crypto_type type;
};
static int nx842_init(struct crypto_tfm *tfm)
{
struct nx842_ctx *ctx = crypto_tfm_ctx(tfm);
int wmemsize;
wmemsize = max_t(int, nx842_get_workmem_size(), LZO1X_MEM_COMPRESS);
ctx->nx842_wmem = kmalloc(wmemsize, GFP_NOFS);
if (!ctx->nx842_wmem)
return -ENOMEM;
return 0;
}
static void nx842_exit(struct crypto_tfm *tfm)
{
struct nx842_ctx *ctx = crypto_tfm_ctx(tfm);
kfree(ctx->nx842_wmem);
}
static void nx842_reset_uselzo(unsigned long data)
{
nx842_uselzo = 0;
}
static DEFINE_TIMER(failover_timer, nx842_reset_uselzo, 0, 0);
static int nx842_crypto_compress(struct crypto_tfm *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen)
{
struct nx842_ctx *ctx = crypto_tfm_ctx(tfm);
struct nx842_crypto_header *hdr;
unsigned int tmp_len = *dlen;
size_t lzodlen; /* needed for lzo */
int err;
*dlen = 0;
hdr = (struct nx842_crypto_header *)dst;
hdr->sentinel = NX842_SENTINEL; /* debug */
dst += sizeof(struct nx842_crypto_header);
tmp_len -= sizeof(struct nx842_crypto_header);
lzodlen = tmp_len;
if (likely(!nx842_uselzo)) {
err = nx842_compress(src, slen, dst, &tmp_len, ctx->nx842_wmem);
if (likely(!err)) {
hdr->type = NX842_CRYPTO_TYPE_842;
*dlen = tmp_len + sizeof(struct nx842_crypto_header);
return 0;
}
/* hardware failed */
nx842_uselzo = 1;
/* set timer to check for hardware again in 1 second */
mod_timer(&failover_timer, jiffies + msecs_to_jiffies(1000));
}
/* no hardware, use lzo */
err = lzo1x_1_compress(src, slen, dst, &lzodlen, ctx->nx842_wmem);
if (err != LZO_E_OK)
return -EINVAL;
hdr->type = NX842_CRYPTO_TYPE_LZO;
*dlen = lzodlen + sizeof(struct nx842_crypto_header);
return 0;
}
static int nx842_crypto_decompress(struct crypto_tfm *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen)
{
struct nx842_ctx *ctx = crypto_tfm_ctx(tfm);
struct nx842_crypto_header *hdr;
unsigned int tmp_len = *dlen;
size_t lzodlen; /* needed for lzo */
int err;
*dlen = 0;
hdr = (struct nx842_crypto_header *)src;
if (unlikely(hdr->sentinel != NX842_SENTINEL))
return -EINVAL;
src += sizeof(struct nx842_crypto_header);
slen -= sizeof(struct nx842_crypto_header);
if (likely(hdr->type == NX842_CRYPTO_TYPE_842)) {
err = nx842_decompress(src, slen, dst, &tmp_len,
ctx->nx842_wmem);
if (err)
return -EINVAL;
*dlen = tmp_len;
} else if (hdr->type == NX842_CRYPTO_TYPE_LZO) {
lzodlen = tmp_len;
err = lzo1x_decompress_safe(src, slen, dst, &lzodlen);
if (err != LZO_E_OK)
return -EINVAL;
*dlen = lzodlen;
} else
return -EINVAL;
return 0;
}
static struct crypto_alg alg = {
.cra_name = "842",
.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
.cra_ctxsize = sizeof(struct nx842_ctx),
.cra_module = THIS_MODULE,
.cra_init = nx842_init,
.cra_exit = nx842_exit,
.cra_u = { .compress = {
.coa_compress = nx842_crypto_compress,
.coa_decompress = nx842_crypto_decompress } }
};
static int __init nx842_mod_init(void)
{
del_timer(&failover_timer);
return crypto_register_alg(&alg);
}
static void __exit nx842_mod_exit(void)
{
crypto_unregister_alg(&alg);
}
module_init(nx842_mod_init);
module_exit(nx842_mod_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("842 Compression Algorithm");
MODULE_ALIAS_CRYPTO("842");
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