mirror of https://github.com/trapexit/mergerfs.git
87 lines
2.0 KiB
C++
87 lines
2.0 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 "fs_readahead.hpp"
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#include "fmt/core.h"
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#include "fs_lstat.hpp"
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#include <cstdint>
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#include <fstream>
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#include <string>
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#include <sys/sysmacros.h>
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namespace l
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{
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static
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std::string
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generate_readahead_sys_path(const std::uint64_t major_,
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const std::uint64_t minor_)
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{
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return fmt::format("/sys/class/bdi/{}:{}/read_ahead_kb",major_,minor_);
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}
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}
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int
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fs::readahead(const std::uint64_t major_dev_,
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const std::uint64_t minor_dev_,
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const std::uint64_t size_in_kb_)
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{
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std::string syspath;
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std::ofstream ofs;
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syspath = l::generate_readahead_sys_path(major_dev_,minor_dev_);
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ofs.open(syspath);
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if(ofs)
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{
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ofs << fmt::format("{}\n",size_in_kb_);
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ofs.close();
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}
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return 0;
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}
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int
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fs::readahead(const std::uint64_t dev_,
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const std::uint64_t size_in_kb_)
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{
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std::uint32_t major_dev;
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std::uint32_t minor_dev;
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major_dev = major(dev_);
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minor_dev = minor(dev_);
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return fs::readahead(major_dev,minor_dev,size_in_kb_);
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}
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int
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fs::readahead(const std::string path_,
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const std::uint64_t size_in_kb_)
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{
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int rv;
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struct stat st;
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rv = fs::lstat(path_,&st);
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if(rv == -1)
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return -errno;
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return fs::readahead(st.st_dev,size_in_kb_);
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}
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