func (m *MemMapFs) getData() map[string]*mem.FileData {
m.init.Do(func() {
m.data = make(map[string]*mem.FileData)
// Root should always exist, right?
// TODO: what about windows?
m.data[FilePathSeparator] = mem.CreateDir(FilePathSeparator)
})
return m.data
}
func (m *MemMapFs) lockfreeMkdir(name string, perm os.FileMode) error {
name = normalizePath(name)
x, ok := m.getData()[name]
if ok {
// Only return ErrFileExists if it's a file, not a directory.
i := mem.FileInfo{x}
if !i.IsDir() {
return ErrFileExists
}
} else {
item := mem.CreateDir(name)
m.getData()[name] = item
m.registerWithParent(item)
}
return nil
}
func (m *MemMapFs) Mkdir(name string, perm os.FileMode) error {
name = normalizePath(name)
m.mu.RLock()
_, ok := m.getData()[name]
m.mu.RUnlock()
if ok {
return &os.PathError{"mkdir", name, ErrFileExists}
} else {
m.mu.Lock()
item := mem.CreateDir(name)
m.getData()[name] = item
m.registerWithParent(item)
m.mu.Unlock()
}
return nil
}