Mirror
/
mergerfs
mirror of https://github.com/trapexit/mergerfs.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
Browse Source

have link act similar to rename 

closes #193
pull/197/head
Antonio SJ Musumeci 9 years ago
parent
2fe465a29c
commit
62f8fc524e
1 changed files with 152 additions and 38 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 190
      src/link.cpp

190
src/link.cpp
View File

@ -36,34 +36,102 @@ using namespace mergerfs;
static
int
_single_link(Policy::Func::Search searchFunc,
const vector<string> &srcmounts,
const size_t minfreespace,
const string &base,
const string &oldpath,
const string &newpath)
_link_create_path_one(const string &oldbasepath,
const string &newbasepath,
const string &oldfusepath,
const string &newfusepath,
const string &newfusedirpath,
const int error)
{
int rv;
const string fulloldpath = fs::path::make(base,oldpath);
const string fullnewpath = fs::path::make(base,newpath);
string oldfullpath;
string newfullpath;
rv = ::link(fulloldpath.c_str(),fullnewpath.c_str());
if((rv == -1) && (errno == ENOENT))
if(oldbasepath != newbasepath)
{
string newpathdir;
vector<string> foundpath;
const ugid::SetRootGuard ugidGuard;
fs::clonepath(newbasepath,oldbasepath,newfusedirpath);
}
fs::path::make(oldbasepath,oldfusepath,oldfullpath);
fs::path::make(oldbasepath,newfusepath,newfullpath);
rv = ::link(oldfullpath.c_str(),newfullpath.c_str());
return calc_error(rv,error,errno);
}
static
int
_link_create_path(Policy::Func::Search searchFunc,
Policy::Func::Action actionFunc,
const vector<string> &srcmounts,
const size_t minfreespace,
const string &oldfusepath,
const string &newfusepath)
{
int rv;
int error;
string newbasepath;
vector<string> toremove;
vector<string> oldbasepaths;
newpathdir = fs::path::dirname(newpath);
rv = searchFunc(srcmounts,newpathdir,minfreespace,foundpath);
if(rv == -1)
return -1;
rv = actionFunc(srcmounts,oldfusepath,minfreespace,oldbasepaths);
if(rv == -1)
return -errno;
{
const ugid::SetRootGuard ugidGuard;
fs::clonepath(foundpath[0],base,newpathdir);
}
const string newfusedirpath = fs::path::dirname(newfusepath);
rv = searchFunc(srcmounts,newfusedirpath,minfreespace,newbasepath);
if(rv == -1)
return -errno;
rv = ::link(fulloldpath.c_str(),fullnewpath.c_str());
error = -1;
for(size_t i = 0, ei = oldbasepaths.size(); i != ei; i++)
{
const string &oldbasepath = oldbasepaths[i];
error = _link_create_path_one(oldbasepath,newbasepath,
oldfusepath,newfusepath,
newfusedirpath,
error);
}
return -error;
}
static
int
_clonepath_if_would_create(Policy::Func::Search searchFunc,
Policy::Func::Create createFunc,
const vector<string> &srcmounts,
const size_t minfreespace,
const string &oldbasepath,
const string &oldfusepath,
const string &newfusepath)
{
int rv;
string newbasepath;
string newfusedirpath;
newfusedirpath = fs::path::dirname(newfusepath);
rv = createFunc(srcmounts,newfusedirpath,minfreespace,newbasepath);
if(rv != -1)
{
if(oldbasepath == newbasepath)
{
rv = searchFunc(srcmounts,newfusedirpath,minfreespace,newbasepath);
if(rv != -1)
{
const ugid::SetRootGuard ugidGuard;
fs::clonepath(newbasepath,oldbasepath,newfusedirpath);
}
}
else
{
rv = -1;
errno = EXDEV;
}
}
return rv;
@ -71,27 +139,64 @@ _single_link(Policy::Func::Search searchFunc,
static
int
_link(Policy::Func::Search searchFunc,
Policy::Func::Action actionFunc,
const vector<string> &srcmounts,
const size_t minfreespace,
const string &oldpath,
const string &newpath)
_link_preserve_path_one(Policy::Func::Search searchFunc,
Policy::Func::Create createFunc,
const vector<string> &srcmounts,
const size_t minfreespace,
const string &oldbasepath,
const string &oldfusepath,
const string &newfusepath,
const int error)
{
int rv;
string oldfullpath;
string newfullpath;
fs::path::make(oldbasepath,oldfusepath,oldfullpath);
fs::path::make(oldbasepath,newfusepath,newfullpath);
rv = ::link(oldfullpath.c_str(),newfullpath.c_str());
if((rv == -1) && (errno == ENOENT))
{
rv = _clonepath_if_would_create(searchFunc,createFunc,
srcmounts,minfreespace,
oldbasepath,oldfusepath,newfusepath);
if(rv != -1)
rv = ::link(oldfullpath.c_str(),newfullpath.c_str());
}
return calc_error(rv,error,errno);
}
static
int
_link_preserve_path(Policy::Func::Search searchFunc,
Policy::Func::Action actionFunc,
Policy::Func::Create createFunc,
const vector<string> &srcmounts,
const size_t minfreespace,
const string &oldfusepath,
const string &newfusepath)
{
int rv;
int error;
vector<string> oldpaths;
vector<string> toremove;
vector<string> oldbasepaths;
rv = actionFunc(srcmounts,oldpath,minfreespace,oldpaths);
rv = actionFunc(srcmounts,oldfusepath,minfreespace,oldbasepaths);
if(rv == -1)
return -errno;
error = -1;
for(size_t i = 0, ei = oldpaths.size(); i != ei; i++)
for(size_t i = 0, ei = oldbasepaths.size(); i != ei; i++)
{
rv = _single_link(searchFunc,srcmounts,minfreespace,oldpaths[i],oldpath,newpath);
const string &oldbasepath = oldbasepaths[i];
error = calc_error(rv,error,errno);
error = _link_preserve_path_one(searchFunc,createFunc,
srcmounts,minfreespace,
oldbasepath,
oldfusepath,newfusepath,
error);
}
return -error;
@ -110,12 +215,21 @@ namespace mergerfs
const ugid::Set ugid(fc->uid,fc->gid);
const rwlock::ReadGuard readlock(&config.srcmountslock);
return _link(config.getattr,
config.link,
config.srcmounts,
config.minfreespace,
from,
to);
if(config.create != Policy::epmfs)
return _link_create_path(config.link,
config.create,
config.srcmounts,
config.minfreespace,
from,
to);
return _link_preserve_path(config.getattr,
config.link,
config.create,
config.srcmounts,
config.minfreespace,
from,
to);
}
}
}
Write Preview
Loading…
Cancel
Save