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142 lines
3.4 KiB
142 lines
3.4 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 "policy_pfrd.hpp"
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#include "errno.hpp"
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#include "fs_info.hpp"
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#include "fs_path.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_pfrd.hpp"
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#include "rnd.hpp"
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#include "strvec.hpp"
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#include <string>
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#include <vector>
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struct BranchInfo
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{
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uint64_t spaceavail;
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Branch *branch;
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};
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typedef std::vector<BranchInfo> BranchInfoVec;
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static
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int
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_get_branchinfo(const Branches::Ptr &branches_,
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BranchInfoVec *branchinfo_,
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uint64_t *sum_)
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{
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int rv;
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int err;
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fs::info_t info;
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*sum_ = 0;
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err = ENOENT;
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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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rv = fs::info(branch.path,&info);
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if(rv < 0)
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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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*sum_ += info.spaceavail;
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branchinfo_->push_back({info.spaceavail,&branch});
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}
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return -err;
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}
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static
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Branch*
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_get_branch(const BranchInfoVec &branchinfo_,
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const uint64_t sum_)
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{
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uint64_t idx;
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uint64_t threshold;
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if(sum_ == 0)
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return nullptr;
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idx = 0;
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threshold = RND::rand64(sum_);
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for(const auto &bi : branchinfo_)
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{
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idx += bi.spaceavail;
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if(idx < threshold)
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continue;
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return bi.branch;
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}
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return nullptr;
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}
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static
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int
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_create(const Branches::Ptr &branches_,
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const char *fusepath_,
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std::vector<Branch*> &paths_)
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{
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int err;
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uint64_t sum;
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Branch *branch;
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BranchInfoVec branchinfo;
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err = ::_get_branchinfo(branches_,&branchinfo,&sum);
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branch = ::_get_branch(branchinfo,sum);
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if(!branch)
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return err;
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paths_.emplace_back(branch);
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return 0;
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}
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int
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Policy::PFRD::Action::operator()(const Branches::Ptr &branches_,
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const char *fusepath_,
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std::vector<Branch*> &paths_) const
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{
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return Policies::Action::eppfrd(branches_,fusepath_,paths_);
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}
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int
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Policy::PFRD::Create::operator()(const Branches::Ptr &branches_,
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const char *fusepath_,
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std::vector<Branch*> &paths_) const
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{
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return ::_create(branches_,fusepath_,paths_);
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}
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int
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Policy::PFRD::Search::operator()(const Branches::Ptr &branches_,
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const char *fusepath_,
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std::vector<Branch*> &paths_) const
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{
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return Policies::Search::eppfrd(branches_,fusepath_,paths_);
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}
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