189     children: BTreeMap<String, Arc<dyn IndexNode>>,  field
210             children: BTreeMap::new(),  in new_with_parent()
236         if guard.children.contains_key(name) {  in add_dir()
253         if this.children.contains_key(name) {  in add_dev()
257         this.children.insert(name.to_string(), dev);  in add_dev()
265             .children  in remove()
282         if guard.children.contains_key(_name) {  in do_create_with_data()
290             children: BTreeMap::new(),  in do_create_with_data()
314         guard.children.insert(String::from(_name), result.clone());  in do_create_with_data()
362                 return Ok(inode.children.get(name).ok_or(-(ENOENT as i32))?.clone());  in find()
388                     .children  in get_entry_name()
390                     .filter(|k| inode.children.get(*k).unwrap().metadata().unwrap().inode_id == ino)  in get_entry_name()
416         keys.append(&mut self.0.lock().children.keys().cloned().collect());  in list()