mirror of https://github.com/trapexit/mergerfs.git
156 lines
3.4 KiB
C++
156 lines
3.4 KiB
C++
/*
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Copyright (c) 2019, 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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#define _DEFAULT_SOURCE
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#include "fuse_readdir_seq.hpp"
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#include "branches.hpp"
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#include "config.hpp"
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#include "dirinfo.hpp"
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#include "errno.hpp"
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#include "fs_closedir.hpp"
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#include "fs_devid.hpp"
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#include "fs_dirfd.hpp"
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#include "fs_inode.hpp"
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#include "fs_opendir.hpp"
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#include "fs_path.hpp"
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#include "fs_readdir.hpp"
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#include "fs_stat.hpp"
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#include "hashset.hpp"
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#include "scope_guard.hpp"
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#include "ugid.hpp"
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#include "fuse.h"
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#include "fuse_dirents.h"
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#include <string>
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namespace l
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{
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struct Error
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{
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private:
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int _err;
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public:
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Error()
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: _err(ENOENT)
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{
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}
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operator int()
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{
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return _err;
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}
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Error&
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operator=(int v_)
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{
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if(_err != 0)
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_err = v_;
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return *this;
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}
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};
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static
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uint64_t
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dirent_exact_namelen(const struct dirent *d_)
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{
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#ifdef _D_EXACT_NAMLEN
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return _D_EXACT_NAMLEN(d_);
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#elif defined _DIRENT_HAVE_D_NAMLEN
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return d_->d_namlen;
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#else
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return strlen(d_->d_name);
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#endif
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}
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static
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int
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readdir(const Branches::CPtr &branches_,
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const char *dirname_,
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fuse_dirents_t *buf_)
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{
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Error error;
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HashSet names;
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std::string basepath;
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std::string fullpath;
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fuse_dirents_reset(buf_);
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for(auto const &branch : *branches_)
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{
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int rv;
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DIR *dh;
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dev_t dev;
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basepath = fs::path::make(branch.path,dirname_);
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errno = 0;
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dh = fs::opendir(basepath);
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error = errno;
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if(!dh)
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continue;
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DEFER{ fs::closedir(dh); };
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dev = fs::devid(dh);
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rv = 0;
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for(dirent *de = fs::readdir(dh); de && !rv; de = fs::readdir(dh))
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{
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std::uint64_t namelen;
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namelen = l::dirent_exact_namelen(de);
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rv = names.put(de->d_name,namelen);
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if(rv == 0)
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continue;
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fullpath = fs::path::make(dirname_,de->d_name);
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de->d_ino = fs::inode::calc(fullpath,
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DTTOIF(de->d_type),
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dev,
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de->d_ino);
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rv = fuse_dirents_add(buf_,de,namelen);
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if(rv)
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return -ENOMEM;
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}
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}
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return -error;
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}
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}
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int
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FUSE::ReadDirSeq::operator()(fuse_file_info_t const *ffi_,
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fuse_dirents_t *buf_)
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{
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Config::Read cfg;
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DirInfo *di = reinterpret_cast<DirInfo*>(ffi_->fh);
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const fuse_context *fc = fuse_get_context();
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const ugid::Set ugid(fc->uid,fc->gid);
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return l::readdir(cfg->branches,
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di->fusepath.c_str(),
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buf_);
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}
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