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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.
*
*/
#include <errno.h>
#include <dlfcn.h>
#include "ceph_ver.h"
#include "ErasureCodePlugin.h"
#include "common/errno.h"
#include "include/str_list.h"
using namespace std;
#define PLUGIN_PREFIX "libec_"
#if defined(__APPLE__)
#define PLUGIN_SUFFIX ".dylib"
#else
#define PLUGIN_SUFFIX ".so"
#endif
#define PLUGIN_INIT_FUNCTION "__erasure_code_init"
#define PLUGIN_VERSION_FUNCTION "__erasure_code_version"
ErasureCodePluginRegistry ErasureCodePluginRegistry::singleton;
ErasureCodePluginRegistry::ErasureCodePluginRegistry() :
lock("ErasureCodePluginRegistry::lock"),
loading(false),
disable_dlclose(false)
{
}
ErasureCodePluginRegistry::~ErasureCodePluginRegistry()
{
if (disable_dlclose)
return;
for (std::map<std::string,ErasureCodePlugin*>::iterator i = plugins.begin();
i != plugins.end();
++i) {
void *library = i->second->library;
delete i->second;
dlclose(library);
}
}
int ErasureCodePluginRegistry::remove(const std::string &name)
{
ceph_assert(lock.is_locked());
if (plugins.find(name) == plugins.end())
return -ENOENT;
std::map<std::string,ErasureCodePlugin*>::iterator plugin = plugins.find(name);
void *library = plugin->second->library;
delete plugin->second;
dlclose(library);
plugins.erase(plugin);
return 0;
}
int ErasureCodePluginRegistry::add(const std::string &name,
ErasureCodePlugin* plugin)
{
ceph_assert(lock.is_locked());
if (plugins.find(name) != plugins.end())
return -EEXIST;
plugins[name] = plugin;
return 0;
}
ErasureCodePlugin *ErasureCodePluginRegistry::get(const std::string &name)
{
ceph_assert(lock.is_locked());
if (plugins.find(name) != plugins.end())
return plugins[name];
else
return 0;
}
int ErasureCodePluginRegistry::factory(const std::string &plugin_name,
const std::string &directory,
ErasureCodeProfile &profile,
ErasureCodeInterfaceRef *erasure_code,
ostream *ss)
{
ErasureCodePlugin *plugin;
{
Mutex::Locker l(lock);
plugin = get(plugin_name);
if (plugin == 0) {
loading = true;
int r = load(plugin_name, directory, &plugin, ss);
loading = false;
if (r != 0)
return r;
}
}
int r = plugin->factory(directory, profile, erasure_code, ss);
if (r)
return r;
if (profile != (*erasure_code)->get_profile()) {
*ss << __func__ << " profile " << profile << " != get_profile() "
<< (*erasure_code)->get_profile() << std::endl;
return -EINVAL;
}
return 0;
}
static const char *an_older_version() {
return "an older version";
}
int ErasureCodePluginRegistry::load(const std::string &plugin_name,
const std::string &directory,
ErasureCodePlugin **plugin,
ostream *ss)
{
ceph_assert(lock.is_locked());
std::string fname = directory + "/" PLUGIN_PREFIX
+ plugin_name + PLUGIN_SUFFIX;
void *library = dlopen(fname.c_str(), RTLD_NOW);
if (!library) {
*ss << "load dlopen(" << fname << "): " << dlerror();
return -EIO;
}
const char * (*erasure_code_version)() =
(const char *(*)())dlsym(library, PLUGIN_VERSION_FUNCTION);
if (erasure_code_version == NULL)
erasure_code_version = an_older_version;
if (erasure_code_version() != string(CEPH_GIT_NICE_VER)) {
*ss << "expected plugin " << fname << " version " << CEPH_GIT_NICE_VER
<< " but it claims to be " << erasure_code_version() << " instead";
dlclose(library);
return -EXDEV;
}
int (*erasure_code_init)(const char *, const char *) =
(int (*)(const char *, const char *))dlsym(library, PLUGIN_INIT_FUNCTION);
if (erasure_code_init) {
std::string name = plugin_name;
int r = erasure_code_init(name.c_str(), directory.c_str());
if (r != 0) {
*ss << "erasure_code_init(" << plugin_name
<< "," << directory
<< "): " << cpp_strerror(r);
dlclose(library);
return r;
}
} else {
*ss << "load dlsym(" << fname
<< ", " << PLUGIN_INIT_FUNCTION
<< "): " << dlerror();
dlclose(library);
return -ENOENT;
}
*plugin = get(plugin_name);
if (*plugin == 0) {
*ss << "load " << PLUGIN_INIT_FUNCTION << "()"
<< "did not register " << plugin_name;
dlclose(library);
return -EBADF;
}
(*plugin)->library = library;
*ss << __func__ << ": " << plugin_name << " ";
return 0;
}
int ErasureCodePluginRegistry::preload(const std::string &plugins,
const std::string &directory,
ostream *ss)
{
Mutex::Locker l(lock);
list<string> plugins_list;
get_str_list(plugins, plugins_list);
for (list<string>::iterator i = plugins_list.begin();
i != plugins_list.end();
++i) {
ErasureCodePlugin *plugin;
int r = load(*i, directory, &plugin, ss);
if (r)
return r;
}
return 0;
}
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