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123 lines
3.2 KiB
123 lines
3.2 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 "errno.hpp"
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#include "fs.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 "policy.hpp"
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#include "policy_error.hpp"
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#include "rwlock.hpp"
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#include <limits>
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#include <string>
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#include <vector>
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using std::string;
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using std::vector;
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namespace mspmfs
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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 &branches_,
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const string &fusepath_,
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const uint64_t minfreespace_,
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int *err_)
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{
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int rv;
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uint64_t mfs;
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string fusepath;
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fs::info_t info;
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const Branch *branch;
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const string *basepath;
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basepath = NULL;
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mfs = std::numeric_limits<uint64_t>::min();
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for(size_t i = 0, ei = branches_.size(); i != ei; i++)
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{
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branch = &branches_[i];
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if(!fs::exists(branch->path,fusepath))
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error_and_continue(*err_,ENOENT);
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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 == -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 < minfreespace_)
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error_and_continue(*err_,ENOSPC);
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if(info.spaceavail < mfs)
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continue;
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mfs = info.spaceavail;
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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 &branches_,
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const char *fusepath_,
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const uint64_t minfreespace_,
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vector<string> *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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rwlock::ReadGuard guard(&branches_.lock);
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error = ENOENT;
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fusepath = fusepath_;
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do
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{
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basepath = create_1(branches_,fusepath,minfreespace_,&error);
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if(basepath)
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break;
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fusepath = fs::path::dirname(fusepath);
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}
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while(!fusepath.empty());
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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::Func::mspmfs(const Category::Enum::Type type_,
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const Branches &branches_,
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const char *fusepath_,
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const uint64_t minfreespace_,
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vector<string> *paths_)
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{
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if(type_ == Category::Enum::create)
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return mspmfs::create(branches_,fusepath_,minfreespace_,paths_);
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return Policy::Func::epmfs(type_,branches_,fusepath_,minfreespace_,paths_);
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}
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