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/*
Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#ifndef __CDC_H
#define __CDC_H
#ifdef HAVE_LIB_Z
#include "zlib.h"
#endif
#include <glusterfs/xlator.h>
#ifndef MAX_IOVEC
#define MAX_IOVEC 16
#endif
typedef struct cdc_priv {
int window_size;
int mem_level;
int cdc_level;
int min_file_size;
int op_mode;
gf_boolean_t debug;
gf_lock_t lock;
} cdc_priv_t;
typedef struct cdc_info {
/* input bits */
int count;
int32_t ibytes;
struct iovec *vector;
struct iatt *buf;
/* output bits */
int ncount;
int nbytes;
int buffer_size;
struct iovec vec[MAX_IOVEC];
struct iobref *iobref;
/* zlib bits */
#ifdef HAVE_LIB_Z
z_stream stream;
#endif
unsigned long crc;
} cdc_info_t;
#define NVEC(ci) (ci->ncount - 1)
#define CURR_VEC(ci) ci->vec[ci->ncount - 1]
#define THIS_VEC(ci, i) ci->vector[i]
/* Gzip defaults */
#define GF_CDC_DEF_WINDOWSIZE -15 /* default value */
#define GF_CDC_MAX_WINDOWSIZE -8 /* max value */
#ifdef HAVE_LIB_Z
#define GF_CDC_DEF_COMPRESSION Z_DEFAULT_COMPRESSION
#else
#define GF_CDC_DEF_COMPRESSION -1
#endif
#define GF_CDC_DEF_MEMLEVEL 8
#define GF_CDC_DEF_BUFFERSIZE 262144 // 256K - default compression buffer size
/* Operation mode
* If xlator is loaded on client, readv decompresses and writev compresses
* If xlator is loaded on server, readv compresses and writev decompresses
*/
#define GF_CDC_MODE_CLIENT 0
#define GF_CDC_MODE_SERVER 1
/* min size of data to do cmpression
* 0 == compress even 1byte
*/
#define GF_CDC_MIN_CHUNK_SIZE 0
#define GF_CDC_VALIDATION_SIZE 8
#define GF_CDC_OS_ID 0xFF
#define GF_CDC_DEFLATE_CANARY_VAL "deflate"
#define GF_CDC_DEBUG_DUMP_FILE "/tmp/cdcdump.gz"
#define GF_CDC_MODE_IS_CLIENT(m) (strcmp(m, "client") == 0)
#define GF_CDC_MODE_IS_SERVER(m) (strcmp(m, "server") == 0)
int32_t
cdc_compress(xlator_t *this, cdc_priv_t *priv, cdc_info_t *ci, dict_t **xdata);
int32_t
cdc_decompress(xlator_t *this, cdc_priv_t *priv, cdc_info_t *ci, dict_t *xdata);
#endif
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