1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2014 CERN (Switzerland)
*
* Author: Andreas-Joachim Peters <Andreas.Joachim.Peters@cern.ch>
*
* 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.
*
*/
/**
* @file ErasureCodeIsa.cc
*
* @brief Erasure Code CODEC using the INTEL ISA-L library.
*
* The INTEL ISA-L library supports two pre-defined encoding matrices (cauchy = default, reed_sol_van = default)
* The default CODEC implementation using these two matrices is implemented in class ErasureCodeIsaDefault.
* ISA-L allows to use custom matrices which might be added later as implementations deriving from the base class ErasoreCodeIsa.
*/
#ifndef CEPH_ERASURE_CODE_ISA_L_H
#define CEPH_ERASURE_CODE_ISA_L_H
// -----------------------------------------------------------------------------
#include "erasure-code/ErasureCode.h"
#include "ErasureCodeIsaTableCache.h"
// -----------------------------------------------------------------------------
class ErasureCodeIsa : public ceph::ErasureCode {
public:
enum eMatrix {
kVandermonde = 0, kCauchy = 1
};
int k;
int m;
int w;
ErasureCodeIsaTableCache &tcache;
const char *technique;
ErasureCodeIsa(const char *_technique,
ErasureCodeIsaTableCache &_tcache) :
k(0),
m(0),
w(0),
tcache(_tcache),
technique(_technique)
{
}
~ErasureCodeIsa() override
{
}
unsigned int
get_chunk_count() const override
{
return k + m;
}
unsigned int
get_data_chunk_count() const override
{
return k;
}
unsigned int get_chunk_size(unsigned int object_size) const override;
int encode_chunks(const std::set<int> &want_to_encode,
std::map<int, ceph::buffer::list> *encoded) override;
int decode_chunks(const std::set<int> &want_to_read,
const std::map<int, ceph::buffer::list> &chunks,
std::map<int, ceph::buffer::list> *decoded) override;
int init(ceph::ErasureCodeProfile &profile, std::ostream *ss) override;
virtual void isa_encode(char **data,
char **coding,
int blocksize) = 0;
virtual int isa_decode(int *erasures,
char **data,
char **coding,
int blocksize) = 0;
virtual unsigned get_alignment() const = 0;
virtual void prepare() = 0;
private:
virtual int parse(ceph::ErasureCodeProfile &profile,
std::ostream *ss) = 0;
};
// -----------------------------------------------------------------------------
class ErasureCodeIsaDefault : public ErasureCodeIsa {
private:
int matrixtype;
public:
static const std::string DEFAULT_K;
static const std::string DEFAULT_M;
unsigned char* encode_coeff; // encoding coefficient
unsigned char* encode_tbls; // encoding table
ErasureCodeIsaDefault(ErasureCodeIsaTableCache &_tcache,
int matrix = kVandermonde) :
ErasureCodeIsa("default", _tcache),
encode_coeff(0), encode_tbls(0)
{
matrixtype = matrix;
}
~ErasureCodeIsaDefault() override
{
}
void isa_encode(char **data,
char **coding,
int blocksize) override;
virtual bool erasure_contains(int *erasures, int i);
int isa_decode(int *erasures,
char **data,
char **coding,
int blocksize) override;
unsigned get_alignment() const override;
void prepare() override;
private:
int parse(ceph::ErasureCodeProfile &profile,
std::ostream *ss) override;
};
#endif
|
