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128 lines
3.5 KiB
128 lines
3.5 KiB
/*
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The MIT License (MIT)
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Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE 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 <errno.h>
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#include <unistd.h>
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#include "config.hpp"
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#include "fs_clonepath.hpp"
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#include "fs_path.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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_single_link(Policy::Func::Search searchFunc,
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const vector<string> &srcmounts,
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const size_t minfreespace,
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const string &base,
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const string &oldpath,
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const string &newpath)
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{
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int rv;
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const string fulloldpath = fs::path::make(base,oldpath);
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const string fullnewpath = fs::path::make(base,newpath);
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rv = ::link(fulloldpath.c_str(),fullnewpath.c_str());
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if(rv == -1 && errno == ENOENT)
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{
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string newpathdir;
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vector<string> foundpath;
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newpathdir = fs::path::dirname(newpath);
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rv = searchFunc(srcmounts,newpathdir,minfreespace,foundpath);
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if(rv == -1)
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return -1;
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{
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const ugid::SetRootGuard ugidGuard;
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fs::clonepath(foundpath[0],base,newpathdir);
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}
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rv = ::link(fulloldpath.c_str(),fullnewpath.c_str());
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}
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return rv;
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}
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static
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int
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_link(Policy::Func::Search searchFunc,
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Policy::Func::Action actionFunc,
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const vector<string> &srcmounts,
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const size_t minfreespace,
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const string &oldpath,
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const string &newpath)
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{
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int rv;
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int error;
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vector<string> oldpaths;
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rv = actionFunc(srcmounts,oldpath,minfreespace,oldpaths);
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if(rv == -1)
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return -errno;
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error = 0;
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for(size_t i = 0, ei = oldpaths.size(); i != ei; i++)
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{
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rv = _single_link(searchFunc,srcmounts,minfreespace,oldpaths[i],oldpath,newpath);
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if(rv == -1)
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error = errno;
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}
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return -error;
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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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link(const char *from,
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const char *to)
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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 _link(config.getattr,
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config.link,
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config.srcmounts,
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config.minfreespace,
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from,
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to);
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}
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}
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}
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