mirror of https://github.com/trapexit/mergerfs.git
115 lines
2.8 KiB
C++
115 lines
2.8 KiB
C++
/*
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ISC License
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Copyright (c) 2023, 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 "fuse_readdir_factory.hpp"
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#include "fuse_readdir_cor.hpp"
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#include "fuse_readdir_cosr.hpp"
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#include "fuse_readdir_seq.hpp"
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#include <cassert>
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#include <cmath>
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#include <cstdio>
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#include <cstdlib>
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#include <set>
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#define DEFAULT_MAX_QUEUE_DEPTH 3
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namespace l
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{
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static
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void
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read_cfg(std::string const str_,
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std::string &type_,
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unsigned &concurrency_,
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unsigned &max_queue_depth_)
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{
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char type[16];
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int concurrency;
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int max_queue_depth;
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concurrency = 0;
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max_queue_depth = 0;
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std::sscanf(str_.c_str(),
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"%15[a-z]:%d:%d",
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type,
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&concurrency,
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&max_queue_depth);
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if(concurrency == 0)
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concurrency = std::thread::hardware_concurrency();
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else if(concurrency < 0)
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concurrency = (std::thread::hardware_concurrency() / std::abs(concurrency));
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if(concurrency == 0)
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concurrency = 1;
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if(max_queue_depth == 0)
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max_queue_depth = DEFAULT_MAX_QUEUE_DEPTH;
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max_queue_depth *= concurrency;
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type_ = type;
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concurrency_ = concurrency;
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max_queue_depth_ = max_queue_depth;
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}
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}
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bool
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FUSE::ReadDirFactory::valid(std::string const str_)
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{
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unsigned concurrency;
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unsigned max_queue_depth;
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std::string type;
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static const std::set<std::string> types =
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{
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"seq", "cosr", "cor"
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};
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l::read_cfg(str_,type,concurrency,max_queue_depth);
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if(types.find(type) == types.end())
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return false;
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if(concurrency <= 0)
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return false;
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return true;
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}
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std::shared_ptr<FUSE::ReadDirBase>
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FUSE::ReadDirFactory::make(std::string const str_)
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{
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unsigned concurrency;
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unsigned max_queue_depth;
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std::string type;
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if(!valid(str_))
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return {};
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l::read_cfg(str_,type,concurrency,max_queue_depth);
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if(type == "seq")
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return std::make_shared<FUSE::ReadDirSeq>();
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if(type == "cosr")
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return std::make_shared<FUSE::ReadDirCOSR>(concurrency,max_queue_depth);
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if(type == "cor")
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return std::make_shared<FUSE::ReadDirCOR>(concurrency,max_queue_depth);
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return {};
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}
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