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143 lines
3.8 KiB
143 lines
3.8 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 <fuse.h>
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#include <string>
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#include <vector>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "config.hpp"
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#include "errno.hpp"
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#include "fs_clonepath.hpp"
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#include "fs_path.hpp"
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#include "rv.hpp"
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#include "rwlock.hpp"
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#include "ugid.hpp"
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using std::string;
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using std::vector;
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using namespace mergerfs;
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static
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int
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_mknod_loop_core(const string &existingpath,
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const string &createpath,
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const char *fusepath,
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const char *fusedirpath,
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const mode_t mode,
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const dev_t dev,
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const int error)
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{
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int rv;
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string fullpath;
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if(createpath != existingpath)
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{
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const ugid::SetRootGuard ugidGuard;
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fs::clonepath(existingpath,createpath,fusedirpath);
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}
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fs::path::make(&createpath,fusepath,fullpath);
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rv = ::mknod(fullpath.c_str(),mode,dev);
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return calc_error(rv,error,errno);
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}
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static
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int
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_mknod_loop(const string &existingpath,
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const vector<const string*> &createpaths,
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const char *fusepath,
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const char *fusedirpath,
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const mode_t mode,
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const dev_t dev)
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{
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int error;
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error = -1;
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for(size_t i = 0, ei = createpaths.size(); i != ei; i++)
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{
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error = _mknod_loop_core(existingpath,*createpaths[i],
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fusepath,fusedirpath,
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mode,dev,error);
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}
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return -error;
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}
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static
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int
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_mknod(Policy::Func::Search searchFunc,
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Policy::Func::Create createFunc,
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const vector<string> &srcmounts,
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const uint64_t minfreespace,
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const char *fusepath,
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const mode_t mode,
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const dev_t dev)
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{
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int rv;
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string fusedirpath;
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const char *fusedirpathcstr;
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vector<const string*> createpaths;
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vector<const string*> existingpaths;
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fusedirpath = fusepath;
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fs::path::dirname(fusedirpath);
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fusedirpathcstr = fusedirpath.c_str();
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rv = searchFunc(srcmounts,fusedirpathcstr,minfreespace,existingpaths);
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if(rv == -1)
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return -errno;
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rv = createFunc(srcmounts,fusedirpathcstr,minfreespace,createpaths);
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if(rv == -1)
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return -errno;
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return _mknod_loop(*existingpaths[0],createpaths,
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fusepath,fusedirpathcstr,
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mode,dev);
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}
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namespace mergerfs
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{
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namespace fuse
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{
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int
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mknod(const char *fusepath,
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mode_t mode,
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dev_t rdev)
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{
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const fuse_context *fc = fuse_get_context();
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const Config &config = Config::get(fc);
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const ugid::Set ugid(fc->uid,fc->gid);
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const rwlock::ReadGuard readlock(&config.srcmountslock);
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return _mknod(config.getattr,
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config.mknod,
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config.srcmounts,
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config.minfreespace,
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fusepath,
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(mode & ~fc->umask),
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rdev);
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}
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}
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}
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