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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph distributed storage system
*
* Copyright (C) 2013, 2014 Cloudwatt <libre.licensing@cloudwatt.com>
* Copyright (C) 2014 Red Hat <contact@redhat.com>
*
* Author: Loic Dachary <loic@dachary.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
*/
#ifndef CEPH_ERASURE_CODE_JERASURE_H
#define CEPH_ERASURE_CODE_JERASURE_H
#include "erasure-code/ErasureCode.h"
#define DEFAULT_RULESET_ROOT "default"
#define DEFAULT_RULESET_FAILURE_DOMAIN "host"
class ErasureCodeJerasure : public ErasureCode {
public:
int k;
std::string DEFAULT_K;
int m;
std::string DEFAULT_M;
int w;
std::string DEFAULT_W;
const char *technique;
string ruleset_root;
string ruleset_failure_domain;
bool per_chunk_alignment;
explicit ErasureCodeJerasure(const char *_technique) :
k(0),
DEFAULT_K("2"),
m(0),
DEFAULT_M("1"),
w(0),
DEFAULT_W("8"),
technique(_technique),
ruleset_root(DEFAULT_RULESET_ROOT),
ruleset_failure_domain(DEFAULT_RULESET_FAILURE_DOMAIN),
per_chunk_alignment(false)
{}
virtual ~ErasureCodeJerasure() {}
virtual int create_ruleset(const string &name,
CrushWrapper &crush,
ostream *ss) const;
virtual unsigned int get_chunk_count() const {
return k + m;
}
virtual unsigned int get_data_chunk_count() const {
return k;
}
virtual unsigned int get_chunk_size(unsigned int object_size) const;
virtual int encode_chunks(const set<int> &want_to_encode,
map<int, bufferlist> *encoded);
virtual int decode_chunks(const set<int> &want_to_read,
const map<int, bufferlist> &chunks,
map<int, bufferlist> *decoded);
virtual int init(ErasureCodeProfile &profile, ostream *ss);
virtual void jerasure_encode(char **data,
char **coding,
int blocksize) = 0;
virtual int jerasure_decode(int *erasures,
char **data,
char **coding,
int blocksize) = 0;
virtual unsigned get_alignment() const = 0;
virtual void prepare() = 0;
static bool is_prime(int value);
protected:
virtual int parse(ErasureCodeProfile &profile, ostream *ss);
};
class ErasureCodeJerasureReedSolomonVandermonde : public ErasureCodeJerasure {
public:
int *matrix;
ErasureCodeJerasureReedSolomonVandermonde() :
ErasureCodeJerasure("reed_sol_van"),
matrix(0)
{
DEFAULT_K = "7";
DEFAULT_M = "3";
DEFAULT_W = "8";
}
virtual ~ErasureCodeJerasureReedSolomonVandermonde() {
if (matrix)
free(matrix);
}
virtual void jerasure_encode(char **data,
char **coding,
int blocksize);
virtual int jerasure_decode(int *erasures,
char **data,
char **coding,
int blocksize);
virtual unsigned get_alignment() const;
virtual void prepare();
private:
virtual int parse(ErasureCodeProfile &profile, ostream *ss);
};
class ErasureCodeJerasureReedSolomonRAID6 : public ErasureCodeJerasure {
public:
int *matrix;
ErasureCodeJerasureReedSolomonRAID6() :
ErasureCodeJerasure("reed_sol_r6_op"),
matrix(0)
{
DEFAULT_K = "7";
DEFAULT_W = "8";
}
virtual ~ErasureCodeJerasureReedSolomonRAID6() {
if (matrix)
free(matrix);
}
virtual void jerasure_encode(char **data,
char **coding,
int blocksize);
virtual int jerasure_decode(int *erasures,
char **data,
char **coding,
int blocksize);
virtual unsigned get_alignment() const;
virtual void prepare();
private:
virtual int parse(ErasureCodeProfile &profile, ostream *ss);
};
#define DEFAULT_PACKETSIZE "2048"
class ErasureCodeJerasureCauchy : public ErasureCodeJerasure {
public:
int *bitmatrix;
int **schedule;
int packetsize;
explicit ErasureCodeJerasureCauchy(const char *technique) :
ErasureCodeJerasure(technique),
bitmatrix(0),
schedule(0)
{
DEFAULT_K = "7";
DEFAULT_M = "3";
DEFAULT_W = "8";
}
virtual ~ErasureCodeJerasureCauchy() {
if (bitmatrix)
free(bitmatrix);
if (schedule)
free(schedule);
}
virtual void jerasure_encode(char **data,
char **coding,
int blocksize);
virtual int jerasure_decode(int *erasures,
char **data,
char **coding,
int blocksize);
virtual unsigned get_alignment() const;
void prepare_schedule(int *matrix);
private:
virtual int parse(ErasureCodeProfile &profile, ostream *ss);
};
class ErasureCodeJerasureCauchyOrig : public ErasureCodeJerasureCauchy {
public:
ErasureCodeJerasureCauchyOrig() :
ErasureCodeJerasureCauchy("cauchy_orig")
{}
virtual void prepare();
};
class ErasureCodeJerasureCauchyGood : public ErasureCodeJerasureCauchy {
public:
ErasureCodeJerasureCauchyGood() :
ErasureCodeJerasureCauchy("cauchy_good")
{}
virtual void prepare();
};
class ErasureCodeJerasureLiberation : public ErasureCodeJerasure {
public:
int *bitmatrix;
int **schedule;
int packetsize;
explicit ErasureCodeJerasureLiberation(const char *technique = "liberation") :
ErasureCodeJerasure(technique),
bitmatrix(0),
schedule(0)
{
DEFAULT_K = "2";
DEFAULT_M = "2";
DEFAULT_W = "7";
}
virtual ~ErasureCodeJerasureLiberation();
virtual void jerasure_encode(char **data,
char **coding,
int blocksize);
virtual int jerasure_decode(int *erasures,
char **data,
char **coding,
int blocksize);
virtual unsigned get_alignment() const;
virtual bool check_k(ostream *ss) const;
virtual bool check_w(ostream *ss) const;
virtual bool check_packetsize_set(ostream *ss) const;
virtual bool check_packetsize(ostream *ss) const;
virtual int revert_to_default(ErasureCodeProfile &profile,
ostream *ss);
virtual void prepare();
private:
virtual int parse(ErasureCodeProfile &profile, ostream *ss);
};
class ErasureCodeJerasureBlaumRoth : public ErasureCodeJerasureLiberation {
public:
ErasureCodeJerasureBlaumRoth() :
ErasureCodeJerasureLiberation("blaum_roth")
{
}
virtual bool check_w(ostream *ss) const;
virtual void prepare();
};
class ErasureCodeJerasureLiber8tion : public ErasureCodeJerasureLiberation {
public:
ErasureCodeJerasureLiber8tion() :
ErasureCodeJerasureLiberation("liber8tion")
{
DEFAULT_K = "2";
DEFAULT_M = "2";
DEFAULT_W = "8";
}
virtual void prepare();
private:
virtual int parse(ErasureCodeProfile &profile, ostream *ss);
};
#endif
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