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/*
Copyright (c) 2016, Antonio SJ Musumeci <trapexit@spawn.link>
Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include "config.hpp"
#include "errno.hpp"
#include "fs_base_link.hpp"
#include "fs_clonepath.hpp"
#include "fs_path.hpp"
#include "rv.hpp"
#include "rwlock.hpp"
#include "ugid.hpp"
#include <fuse.h>
#include <string>
#include <vector>
using std::string; using std::vector;
namespace l { static int link_create_path_core(const string &oldbasepath_, const string &newbasepath_, const char *oldfusepath_, const char *newfusepath_, const int error_) { int rv; string oldfullpath; string newfullpath;
oldfullpath = fs::path::make(&oldbasepath_,oldfusepath_); newfullpath = fs::path::make(&oldbasepath_,newfusepath_);
rv = fs::link(oldfullpath,newfullpath);
return error::calc(rv,error_,errno); }
static int link_create_path_loop(const vector<const string*> &oldbasepaths_, const string &newbasepath_, const char *oldfusepath_, const char *newfusepath_, const string &newfusedirpath_) { int rv; int error;
error = -1; for(size_t i = 0, ei = oldbasepaths_.size(); i != ei; i++) { rv = fs::clonepath_as_root(newbasepath_,*oldbasepaths_[i],newfusedirpath_); if(rv == -1) error = error::calc(rv,error,errno); else error = l::link_create_path_core(*oldbasepaths_[i],newbasepath_, oldfusepath_,newfusepath_, error); }
return -error; }
static int link_create_path(Policy::Func::Search searchFunc_, Policy::Func::Action actionFunc_, const Branches &branches_, const uint64_t minfreespace_, const char *oldfusepath_, const char *newfusepath_) { int rv; string newfusedirpath; vector<const string*> oldbasepaths; vector<const string*> newbasepaths;
rv = actionFunc_(branches_,oldfusepath_,minfreespace_,oldbasepaths); if(rv == -1) return -errno;
newfusedirpath = fs::path::dirname(newfusepath_);
rv = searchFunc_(branches_,newfusedirpath,minfreespace_,newbasepaths); if(rv == -1) return -errno;
return l::link_create_path_loop(oldbasepaths,*newbasepaths[0], oldfusepath_,newfusepath_, newfusedirpath); }
static int clonepath_if_would_create(Policy::Func::Search searchFunc_, Policy::Func::Create createFunc_, const Branches &branches_, const uint64_t minfreespace_, const string &oldbasepath_, const char *oldfusepath_, const char *newfusepath_) { int rv; string newfusedirpath; vector<const string*> newbasepath;
newfusedirpath = fs::path::dirname(newfusepath_);
rv = createFunc_(branches_,newfusedirpath,minfreespace_,newbasepath); if(rv == -1) return -1;
if(oldbasepath_ != *newbasepath[0]) return (errno=EXDEV,-1);
rv = searchFunc_(branches_,newfusedirpath,minfreespace_,newbasepath); if(rv == -1) return -1;
return fs::clonepath_as_root(*newbasepath[0],oldbasepath_,newfusedirpath); }
static int link_preserve_path_core(Policy::Func::Search searchFunc_, Policy::Func::Create createFunc_, const Branches &branches_, const uint64_t minfreespace_, const string &oldbasepath_, const char *oldfusepath_, const char *newfusepath_, const int error_) { int rv; string oldfullpath; string newfullpath;
oldfullpath = fs::path::make(&oldbasepath_,oldfusepath_); newfullpath = fs::path::make(&oldbasepath_,newfusepath_);
rv = fs::link(oldfullpath,newfullpath); if((rv == -1) && (errno == ENOENT)) { rv = l::clonepath_if_would_create(searchFunc_,createFunc_, branches_,minfreespace_, oldbasepath_, oldfusepath_,newfusepath_); if(rv != -1) rv = fs::link(oldfullpath,newfullpath); }
return error::calc(rv,error_,errno); }
static int link_preserve_path_loop(Policy::Func::Search searchFunc_, Policy::Func::Create createFunc_, const Branches &branches_, const uint64_t minfreespace_, const char *oldfusepath_, const char *newfusepath_, const vector<const string*> &oldbasepaths_) { int error;
error = -1; for(size_t i = 0, ei = oldbasepaths_.size(); i != ei; i++) { error = l::link_preserve_path_core(searchFunc_,createFunc_, branches_,minfreespace_, *oldbasepaths_[i], oldfusepath_,newfusepath_, error); }
return -error; }
static int link_preserve_path(Policy::Func::Search searchFunc_, Policy::Func::Action actionFunc_, Policy::Func::Create createFunc_, const Branches &branches_, const uint64_t minfreespace_, const char *oldfusepath_, const char *newfusepath_) { int rv; vector<const string*> oldbasepaths;
rv = actionFunc_(branches_,oldfusepath_,minfreespace_,oldbasepaths); if(rv == -1) return -errno;
return l::link_preserve_path_loop(searchFunc_,createFunc_, branches_,minfreespace_, oldfusepath_,newfusepath_, oldbasepaths); } }
namespace FUSE { int link(const char *from_, const char *to_) { const fuse_context *fc = fuse_get_context(); const Config &config = Config::get(fc); const ugid::Set ugid(fc->uid,fc->gid); const rwlock::ReadGuard readlock(&config.branches_lock);
if(config.create->path_preserving() && !config.ignorepponrename) return l::link_preserve_path(config.getattr, config.link, config.create, config.branches, config.minfreespace, from_, to_);
return l::link_create_path(config.link, config.create, config.branches, config.minfreespace, from_, to_); } }
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