ceph/src/erasure-code/shec/ErasureCodePluginShec.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2014 FUJITSU LIMITED
   7  * Copyright (C) 2013,2014 Cloudwatt <libre.licensing@cloudwatt.com>
   8  * Copyright (C) 2014 Red Hat <contact@redhat.com>
   9  *
  10  * Author: Takanori Nakao <nakao.takanori@jp.fujitsu.com>
  11  * Author: Takeshi Miyamae <miyamae.takeshi@jp.fujitsu.com>
  12  * Author: Loic Dachary <loic@dachary.org>
  13  *
  14  *  This library is free software; you can redistribute it and/or
  15  *  modify it under the terms of the GNU Lesser General Public
  16  *  License as published by the Free Software Foundation; either
  17  *  version 2.1 of the License, or (at your option) any later version.
  18  *
  19  */
  20
  21 #include "ceph_ver.h"
  22 #include "common/debug.h"
  23 #include "ErasureCodePluginShec.h"
  24 #include "ErasureCodeShecTableCache.h"
  25 #include "ErasureCodeShec.h"
  26 #include "jerasure_init.h"
  27
  28 #define dout_context g_ceph_context
  29
  30 #define dout_subsys ceph_subsys_osd
  31 #undef dout_prefix
  32 #define dout_prefix _prefix(_dout)
  33
  34 static ostream& _prefix(std::ostream* _dout)
  35 {
  36   return *_dout << "ErasureCodePluginShec: ";
  37 }
  38
  39 int ErasureCodePluginShec::factory(const std::string &directory,
  40                       ErasureCodeProfile &profile,
  41                       ErasureCodeInterfaceRef *erasure_code,
  42                       ostream *ss) {
  43     ErasureCodeShec *interface;
  44
  45     if (profile.find("technique") == profile.end())
  46       profile["technique"] = "multiple";
  47     std::string t = profile.find("technique")->second;
  48
  49     if (t == "single"){
  50       interface = new ErasureCodeShecReedSolomonVandermonde(tcache, ErasureCodeShec::SINGLE);
  51     } else if (t == "multiple"){
  52       interface = new ErasureCodeShecReedSolomonVandermonde(tcache, ErasureCodeShec::MULTIPLE);
  53     } else {
  54       *ss << "technique=" << t << " is not a valid coding technique. "
  55           << "Choose one of the following: "
  56           << "single, multiple ";
  57       return -ENOENT;
  58     }
  59     int r = interface->init(profile, ss);
  60     if (r) {
  61       delete interface;
  62       return r;
  63     }
  64     *erasure_code = ErasureCodeInterfaceRef(interface);
  65
  66     dout(10) << "ErasureCodePluginShec: factory() completed" << dendl;
  67
  68     return 0;
  69 }
  70
  71 #ifndef BUILDING_FOR_EMBEDDED
  72
  73 const char *__erasure_code_version() { return CEPH_GIT_NICE_VER; }
  74
  75 int __erasure_code_init(char *plugin_name, char *directory = (char *)"")
  76 {
  77   ErasureCodePluginRegistry &instance = ErasureCodePluginRegistry::instance();
  78   int w[] = { 8, 16, 32 };
  79   int r = jerasure_init(3, w);
  80   if (r) {
  81     return -r;
  82   }
  83   return instance.add(plugin_name, new ErasureCodePluginShec());
  84 }
  85
  86 #endif