initial code repo

[stor4nfv.git] / src / ceph / src / erasure-code / ErasureCode.h

diff --git a/src/ceph/src/erasure-code/ErasureCode.h b/src/ceph/src/erasure-code/ErasureCode.h
new file mode 100644 (file)
index 0000000..fc79cf0
--- /dev/null
+++ b/src/ceph/src/erasure-code/ErasureCode.h
@@ -0,0 +1,120 @@
+// -*- 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) 2014 Cloudwatt <libre.licensing@cloudwatt.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_H
+#define CEPH_ERASURE_CODE_H
+
+/*! @file ErasureCode.h
+    @brief Base class for erasure code plugins implementors
+
+ */ 
+
+#include "ErasureCodeInterface.h"
+
+namespace ceph {
+
+  class ErasureCode : public ErasureCodeInterface {
+  public:
+    static const unsigned SIMD_ALIGN;
+
+    std::vector<int> chunk_mapping;
+    ErasureCodeProfile _profile;
+
+    // for CRUSH rule
+    std::string rule_root;
+    std::string rule_failure_domain;
+    std::string rule_device_class;
+
+    ~ErasureCode() override {}
+
+    int init(ErasureCodeProfile &profile, std::ostream *ss) override;
+
+    const ErasureCodeProfile &get_profile() const override {
+      return _profile;
+    }
+
+    int create_rule(const std::string &name,
+                   CrushWrapper &crush,
+                   std::ostream *ss) const;
+
+    int sanity_check_k(int k, std::ostream *ss);
+
+    unsigned int get_coding_chunk_count() const override {
+      return get_chunk_count() - get_data_chunk_count();
+    }
+
+    int minimum_to_decode(const std::set<int> &want_to_read,
+                                  const std::set<int> &available_chunks,
+                                  std::set<int> *minimum) override;
+
+    int minimum_to_decode_with_cost(const std::set<int> &want_to_read,
+                                            const std::map<int, int> &available,
+                                            std::set<int> *minimum) override;
+
+    int encode_prepare(const bufferlist &raw,
+                       std::map<int, bufferlist> &encoded) const;
+
+    int encode(const std::set<int> &want_to_encode,
+                       const bufferlist &in,
+                       std::map<int, bufferlist> *encoded) override;
+
+    int encode_chunks(const std::set<int> &want_to_encode,
+                              std::map<int, bufferlist> *encoded) override;
+
+    int decode(const std::set<int> &want_to_read,
+                       const std::map<int, bufferlist> &chunks,
+                       std::map<int, bufferlist> *decoded) override;
+
+    int decode_chunks(const std::set<int> &want_to_read,
+                              const std::map<int, bufferlist> &chunks,
+                              std::map<int, bufferlist> *decoded) override;
+
+    const std::vector<int> &get_chunk_mapping() const override;
+
+    int to_mapping(const ErasureCodeProfile &profile,
+                  std::ostream *ss);
+
+    static int to_int(const std::string &name,
+                     ErasureCodeProfile &profile,
+                     int *value,
+                     const std::string &default_value,
+                     std::ostream *ss);
+
+    static int to_bool(const std::string &name,
+                      ErasureCodeProfile &profile,
+                      bool *value,
+                      const std::string &default_value,
+                      std::ostream *ss);
+
+    static int to_string(const std::string &name,
+                        ErasureCodeProfile &profile,
+                        std::string *value,
+                        const std::string &default_value,
+                        std::ostream *ss);
+
+    int decode_concat(const std::map<int, bufferlist> &chunks,
+                             bufferlist *decoded) override;
+
+  protected:
+    int parse(const ErasureCodeProfile &profile,
+             std::ostream *ss);
+
+  private:
+    int chunk_index(unsigned int i) const;
+  };
+}
+
+#endif