204             let parent_inode: Arc<dyn IndexNode> =  in do_open()  localVariable
207             let inode: Arc<dyn IndexNode> = parent_inode.create(filename, FileType::File, 0o777)?;  in do_open()
308             let parent_inode: Arc<dyn IndexNode> =  in do_mkdir()  localVariable
312                 parent_inode.create(filename, FileType::Dir, 0o777)?;  in do_mkdir()
341     let parent_inode: Arc<dyn IndexNode> = ROOT_INODE().lookup(parent_path.unwrap_or("/"))?;  in do_remove_dir()  localVariable
343     if parent_inode.metadata()?.file_type != FileType::Dir {  in do_remove_dir()
347     let target_inode: Arc<dyn IndexNode> = parent_inode.find(filename)?;  in do_remove_dir()
353     parent_inode.rmdir(filename)?;  in do_remove_dir()
381     let parent_inode: Arc<dyn IndexNode> = ROOT_INODE().lookup(parent_path.unwrap_or("/"))?;  in do_unlink_at()  localVariable
383     if parent_inode.metadata()?.file_type != FileType::Dir {  in do_unlink_at()
388     parent_inode.unlink(filename)?;  in do_unlink_at()