mirror of
https://github.com/trapexit/mergerfs.git
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125 lines
3.4 KiB
C++
125 lines
3.4 KiB
C++
/*
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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 "errno.hpp"
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#include "fs_exists.hpp"
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#include "fs_info.hpp"
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#include "fs_path.hpp"
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#include "fs_statvfs_cache.hpp"
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#include "policies.hpp"
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#include "policy.hpp"
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#include "policy_error.hpp"
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#include "policy_msplus.hpp"
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#include <limits>
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#include <string>
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using std::string;
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namespace msplus
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{
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static
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const
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string*
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create_1(const Branches::CPtr &branches_,
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const string &fusepath_,
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int *err_)
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{
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int rv;
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uint64_t lus;
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fs::info_t info;
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const string *basepath;
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basepath = NULL;
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lus = std::numeric_limits<uint64_t>::max();
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for(auto &branch : *branches_)
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{
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if(branch.ro_or_nc())
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error_and_continue(*err_,EROFS);
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if(!fs::exists(branch.path,fusepath_))
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error_and_continue(*err_,ENOENT);
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rv = fs::info(branch.path,&info);
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if(rv == -1)
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error_and_continue(*err_,ENOENT);
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if(info.readonly)
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error_and_continue(*err_,EROFS);
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if(info.spaceavail < branch.minfreespace())
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error_and_continue(*err_,ENOSPC);
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if(info.spaceused >= lus)
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continue;
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lus = info.spaceused;;
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basepath = &branch.path;
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}
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return basepath;
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}
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static
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int
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create(const Branches::CPtr &branches_,
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const char *fusepath_,
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StrVec *paths_)
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{
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int error;
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string fusepath;
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const string *basepath;
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error = ENOENT;
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fusepath = fusepath_;
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for(;;)
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{
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basepath = msplus::create_1(branches_,fusepath,&error);
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if(basepath)
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break;
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if(fusepath == "/")
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break;
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fusepath = fs::path::dirname(fusepath);
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}
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if(basepath == NULL)
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return (errno=error,-1);
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paths_->push_back(*basepath);
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return 0;
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}
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}
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int
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Policy::MSPLUS::Action::operator()(const Branches::CPtr &branches_,
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const char *fusepath_,
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StrVec *paths_) const
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{
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return Policies::Action::eplus(branches_,fusepath_,paths_);
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}
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int
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Policy::MSPLUS::Create::operator()(const Branches::CPtr &branches_,
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const char *fusepath_,
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StrVec *paths_) const
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{
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return ::msplus::create(branches_,fusepath_,paths_);
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}
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int
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Policy::MSPLUS::Search::operator()(const Branches::CPtr &branches_,
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const char *fusepath_,
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StrVec *paths_) const
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{
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return Policies::Search::eplus(branches_,fusepath_,paths_);
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}
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