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128 lines
3.4 KiB
128 lines
3.4 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 <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string>
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#include <vector>
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#include "config.hpp"
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#include "fileinfo.hpp"
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#include "fs_path.hpp"
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#include "fs_clonepath.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 mergerfs::Policy;
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using namespace mergerfs;
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static
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int
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_create_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 int flags,
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uint64_t &fh)
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{
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int fd;
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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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fd = ::open(fullpath.c_str(),flags,mode);
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if(fd == -1)
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return -errno;
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fh = reinterpret_cast<uint64_t>(new FileInfo(fd));
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return 0;
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}
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static
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int
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_create(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 size_t minfreespace,
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const char *fusepath,
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const mode_t mode,
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const int flags,
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uint64_t &fh)
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{
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int rv;
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string fullpath;
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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 _create_core(*existingpaths[0],*createpaths[0],
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fusepath,fusedirpathcstr,
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mode,flags,fh);
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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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create(const char *fusepath,
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mode_t mode,
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fuse_file_info *ffi)
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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 _create(config.getattr,
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config.create,
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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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ffi->flags,
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ffi->fh);
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}
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}
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}
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