mirror of
https://github.com/trapexit/mergerfs.git
synced 2026-10-26 19:01:56 -04:00
6ac7f389c5
* Start moving to string_view where possible * Rework readdir object to use atomic load/store
124 lines
2.8 KiB
C++
124 lines
2.8 KiB
C++
/*
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ISC License
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Copyright (c) 2020, 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.hpp"
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#include "fuse_readdir_factory.hpp"
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#include "dirinfo.hpp"
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#include "fuse_dirents.h"
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#include "config.hpp"
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#include <cstring>
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#include <dirent.h>
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/*
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The _initialized stuff is not pretty but easiest way to deal with
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the fact that mergerfs is doing arg parsing and setting up of things
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(including thread pools) before the daemonizing
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*/
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int
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FUSE::readdir(const fuse_file_info_t *ffi_,
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fuse_dirents_t *buf_)
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{
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Config::Write cfg;
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return cfg->readdir(ffi_,buf_);
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}
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FUSE::ReadDir::ReadDir(const std::string_view s_)
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: _str(new std::string())
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{
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from_string(s_);
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}
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std::string
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FUSE::ReadDir::to_string() const
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{
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std::shared_ptr<std::string> str;
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str = std::atomic_load(&_str);
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return (*str);
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}
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int
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FUSE::ReadDir::from_string(const std::string_view str_)
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{
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std::shared_ptr<std::string> tmp_str;
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std::shared_ptr<FUSE::ReadDirBase> tmp_readdir;
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tmp_readdir = FUSE::ReadDirFactory::make(str_);
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if(!tmp_readdir)
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return -EINVAL;
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tmp_str = std::make_shared<std::string>(str_);
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std::atomic_store(&_str,tmp_str);
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std::atomic_store(&_impl,tmp_readdir);
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return 0;
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}
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static
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int
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_handle_ENOENT(const fuse_file_info_t *ffi_,
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fuse_dirents_t *buf_)
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{
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dirent de;
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DirInfo *di = reinterpret_cast<DirInfo*>(ffi_->fh);
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if(di->fusepath != "/")
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return -ENOENT;
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de = {0};
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de.d_ino = 0;
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de.d_off = 0;
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de.d_type = DT_UNKNOWN;
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strcpy(de.d_name,"error: no valid mergerfs branch found, check config");
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de.d_reclen = sizeof(de);
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fuse_dirents_add(buf_,&de,::strlen(de.d_name));
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return 0;
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}
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/*
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Yeah... if not initialized it will crash... ¯\_(ツ)_/¯
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This will be resolved once initialization of internal objects and
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handling of input is better separated.
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*/
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int
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FUSE::ReadDir::operator()(const fuse_file_info_t *ffi_,
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fuse_dirents_t *buf_)
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{
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int rv;
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std::shared_ptr<FUSE::ReadDirBase> readdir;
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readdir = std::atomic_load(&_impl);
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rv = (*readdir)(ffi_,buf_);
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if(rv == -ENOENT)
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return ::_handle_ENOENT(ffi_,buf_);
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return rv;
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}
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