JFS uses extent-based addressing structures, along with aggressive block allocation policies, to produce compact, efficient, and scalable structures for mapping logical offsets within files to physical addresses on disk.

• JFS使用基于盘区的寻址结构,连同主动的块分配策略,产生紧凑、高效、可伸缩的结构,以将文件中的逻辑偏移量映射成磁盘上的物理地址。