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https://github.com/trapexit/mergerfs.git
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5808ab7795
This feature mimics the standard mhddfs behavior but is more thorough. If a write fails and the errno is set to ENOSPC then mergerfs will (if the feature is enabled) attempt to move the file to the drive with the most free space but only if it has enough room for the file plus the amount to be written. If that transfer is successful it will then unlink the original file and attempt the previously failed write again. The copy includes copying the path and file including the acls, owners, attributes, extended attributes, and timestamps.
129 lines
3.5 KiB
C++
129 lines
3.5 KiB
C++
/*
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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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