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144 lines
3.7 KiB
144 lines
3.7 KiB
/*
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Copyright (c) 2016, Antonio SJ Musumeci <trapexit@spawn.link>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <limits>
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#include <string>
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#include <vector>
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#include "errno.hpp"
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#include "fs.hpp"
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#include "fs_path.hpp"
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#include "policy.hpp"
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using std::string;
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using std::vector;
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using mergerfs::Category;
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static
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int
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_epmfs_create(const vector<string> &basepaths,
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const char *fusepath,
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const uint64_t minfreespace,
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vector<const string*> &paths)
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{
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string fullpath;
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uint64_t epmfs;
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const string *epmfsbasepath;
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epmfs = std::numeric_limits<uint64_t>::min();
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epmfsbasepath = NULL;
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for(size_t i = 0, ei = basepaths.size(); i != ei; i++)
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{
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bool readonly;
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uint64_t spaceavail;
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uint64_t _spaceused;
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const string *basepath = &basepaths[i];
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fs::path::make(basepath,fusepath,fullpath);
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if(!fs::exists(fullpath))
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continue;
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if(!fs::info(*basepath,readonly,spaceavail,_spaceused))
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continue;
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if(readonly)
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continue;
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if(spaceavail < minfreespace)
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continue;
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if(spaceavail < epmfs)
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continue;
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epmfs = spaceavail;
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epmfsbasepath = basepath;
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}
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if(epmfsbasepath == NULL)
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return POLICY_FAIL_ENOENT;
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paths.push_back(epmfsbasepath);
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return POLICY_SUCCESS;
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}
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static
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int
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_epmfs_other(const vector<string> &basepaths,
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const char *fusepath,
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vector<const string*> &paths)
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{
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string fullpath;
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uint64_t epmfs;
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const string *epmfsbasepath;
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epmfs = 0;
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epmfsbasepath = NULL;
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for(size_t i = 0, ei = basepaths.size(); i != ei; i++)
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{
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uint64_t spaceavail;
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const string *basepath = &basepaths[i];
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fs::path::make(basepath,fusepath,fullpath);
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if(!fs::exists(fullpath))
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continue;
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if(!fs::spaceavail(*basepath,spaceavail))
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continue;
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if(spaceavail < epmfs)
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continue;
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epmfs = spaceavail;
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epmfsbasepath = basepath;
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}
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if(epmfsbasepath == NULL)
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return POLICY_FAIL_ENOENT;
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paths.push_back(epmfsbasepath);
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return POLICY_SUCCESS;
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}
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static
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int
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_epmfs(const Category::Enum::Type type,
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const vector<string> &basepaths,
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const char *fusepath,
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const uint64_t minfreespace,
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vector<const string*> &paths)
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{
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if(type == Category::Enum::create)
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return _epmfs_create(basepaths,fusepath,minfreespace,paths);
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return _epmfs_other(basepaths,fusepath,paths);
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}
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namespace mergerfs
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{
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int
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Policy::Func::epmfs(const Category::Enum::Type type,
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const vector<string> &basepaths,
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const char *fusepath,
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const uint64_t minfreespace,
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vector<const string*> &paths)
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{
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int rv;
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rv = _epmfs(type,basepaths,fusepath,minfreespace,paths);
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if(POLICY_FAILED(rv))
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rv = Policy::Func::mfs(type,basepaths,fusepath,minfreespace,paths);
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return rv;
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}
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}
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