projects / ceph.git / blame
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|---|---|---|
| 7c673cae FG |
1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
| 2 | // vim: ts=8 sw=2 smarttab | |
| 3 | /* | |
| 4 | * Ceph distributed storage system | |
| 5 | * | |
| 6 | * Copyright (C) 2014 Cloudwatt <libre.licensing@cloudwatt.com> | |
| 7 | * | |
| 8 | * Author: Loic Dachary <loic@dachary.org> | |
| 9 | * | |
| 10 | * This library is free software; you can redistribute it and/or | |
| 11 | * modify it under the terms of the GNU Lesser General Public | |
| 12 | * License as published by the Free Software Foundation; either | |
| 13 | * version 2.1 of the License, or (at your option) any later version. | |
| 14 | * | |
| 15 | */ | |
| 16 | ||
| 17 | #ifndef CEPH_ERASURE_CODE_H | |
| 18 | #define CEPH_ERASURE_CODE_H | |
| 19 | ||
| 20 | /*! @file ErasureCode.h | |
| 21 | @brief Base class for erasure code plugins implementors | |
| 22 | ||
| 23 | */ | |
| 24 | ||
| 25 | #include <vector> | |
| 26 | ||
| 27 | #include "ErasureCodeInterface.h" | |
| 28 | ||
| 29 | namespace ceph { | |
| 30 | ||
| 31 | class ErasureCode : public ErasureCodeInterface { | |
| 32 | public: | |
| 33 | static const unsigned SIMD_ALIGN; | |
| 34 | ||
| 35 | vector<int> chunk_mapping; | |
| 36 | ErasureCodeProfile _profile; | |
| 37 | ||
| 38 | ~ErasureCode() override {} | |
| 39 | ||
| 40 | int init(ErasureCodeProfile &profile, ostream *ss) override { | |
| 41 | _profile = profile; | |
| 42 | return 0; | |
| 43 | } | |
| 44 | ||
| 45 | const ErasureCodeProfile &get_profile() const override { | |
| 46 | return _profile; | |
| 47 | } | |
| 48 | ||
| 49 | int sanity_check_k(int k, ostream *ss); | |
| 50 | ||
| 51 | unsigned int get_coding_chunk_count() const override { | |
| 52 | return get_chunk_count() - get_data_chunk_count(); | |
| 53 | } | |
| 54 | ||
| 55 | int minimum_to_decode(const set<int> &want_to_read, | |
| 56 | const set<int> &available_chunks, | |
| 57 | set<int> *minimum) override; | |
| 58 | ||
| 59 | int minimum_to_decode_with_cost(const set<int> &want_to_read, | |
| 60 | const map<int, int> &available, | |
| 61 | set<int> *minimum) override; | |
| 62 | ||
| 63 | int encode_prepare(const bufferlist &raw, | |
| 64 | map<int, bufferlist> &encoded) const; | |
| 65 | ||
| 66 | int encode(const set<int> &want_to_encode, | |
| 67 | const bufferlist &in, | |
| 68 | map<int, bufferlist> *encoded) override; | |
| 69 | ||
| 70 | int encode_chunks(const set<int> &want_to_encode, | |
| 71 | map<int, bufferlist> *encoded) override; | |
| 72 | ||
| 73 | int decode(const set<int> &want_to_read, | |
| 74 | const map<int, bufferlist> &chunks, | |
| 75 | map<int, bufferlist> *decoded) override; | |
| 76 | ||
| 77 | int decode_chunks(const set<int> &want_to_read, | |
| 78 | const map<int, bufferlist> &chunks, | |
| 79 | map<int, bufferlist> *decoded) override; | |
| 80 | ||
| 81 | const vector<int> &get_chunk_mapping() const override; | |
| 82 | ||
| 83 | int to_mapping(const ErasureCodeProfile &profile, | |
| 84 | ostream *ss); | |
| 85 | ||
| 86 | static int to_int(const std::string &name, | |
| 87 | ErasureCodeProfile &profile, | |
| 88 | int *value, | |
| 89 | const std::string &default_value, | |
| 90 | ostream *ss); | |
| 91 | ||
| 92 | static int to_bool(const std::string &name, | |
| 93 | ErasureCodeProfile &profile, | |
| 94 | bool *value, | |
| 95 | const std::string &default_value, | |
| 96 | ostream *ss); | |
| 97 | ||
| 98 | static int to_string(const std::string &name, | |
| 99 | ErasureCodeProfile &profile, | |
| 100 | std::string *value, | |
| 101 | const std::string &default_value, | |
| 102 | ostream *ss); | |
| 103 | ||
| 104 | int decode_concat(const map<int, bufferlist> &chunks, | |
| 105 | bufferlist *decoded) override; | |
| 106 | ||
| 107 | protected: | |
| 108 | int parse(const ErasureCodeProfile &profile, | |
| 109 | ostream *ss); | |
| 110 | ||
| 111 | private: | |
| 112 | int chunk_index(unsigned int i) const; | |
| 113 | }; | |
| 114 | } | |
| 115 | ||
| 116 | #endif |