Ext3文件系统间接块指针研究  

On Indirect Block Pointer of Ext3 File System

作　　者：苏神保[1] 刘丹[1] Su Shenbao;Liu Dan(Hunan Vocational College of Commerce,Changsha,Hunan,410205)

机构地区：[1]湖南商务职业技术学院,湖南长沙410205

出　　处：《九江职业技术学院学报》2020年第2期21-25,共5页Journal of Jiujiang Vocational and Technical College

摘　　要：在Linux操作系统中,数据是以块为单位存储的,主要使用的文件系统一般为Ext2/3/4等。Ext文件系统跟UFS文件系统一样,在i-节点中用块指针来描述文件的存放地址和大小信息,i-节点通过块指针指向文件。块指针又包含有直接块指针、间接块指针、二级间接块指针和三级间接块指针。EXT3文件系统在文件较小时只用到直接块指针,当文件比较大的情况下则会用到间接块指针。EXT3文件系统中的文件被删除时,其文件目录项不会发生变化,但存放块指针的inode节点被清空了,会给数据恢复带来较大难度。In Linux operating system,data is stored by blocks,and the main file system is ext2/3/4.Like UFS file system,Ext file system uses block pointer to describe the storage address and size information of file in i-node.I-node points to file through block pointer.Block pointer includes direct block pointer,indirect block pointer,secondary indirect block pointer and tertiary indirect block pointer.The ext3 file system only uses direct block pointers when the file size is small,and indirect block pointers when the file size is large.When the files in the ext3 file system are deleted,the file directory entries do not change,but the i-node where the block pointer is stored is cleared.It makes data recovery more difficult.

关 键 词：WINHEX EXT3 块 i-节点 块指针 

分 类 号：TP316.81[自动化与计算机技术—计算机软件与理论]