Extent - based addressing structures rooted in the inode are used for mapping file data to disk 根植于inode基于盘区的寻址结构用来将文件数据映射到磁盘。
The addressing structure is a b tree populated with extent descriptors the triples above , rooted in the inode and keyed by logical offset within the file 寻址结构是一棵b +树,该树由盘区描述符(上面提到的三元组)填充,根在inode中,键为文件中的逻辑偏移量。