dumpe2fs(8) - man - phpMan

DUMPE2FS(8)                            System Manager's Manual                           DUMPE2FS(8)



NAME
       dumpe2fs - dump ext2/ext3/ext4 file system information

SYNOPSIS
       dumpe2fs [ -bfghixV ] [ -o superblock=superblock ] [ -o blocksize=blocksize ] device

DESCRIPTION
       dumpe2fs  prints  the super block and blocks group information for the file system present on
       device.

       Note: When used with a mounted file system, the printed information may be old  or  inconsis‐
       tent.

OPTIONS
       -b     print the blocks which are reserved as bad in the file system.

       -o superblock=superblock
              use  the  block superblock when examining the file system.  This option is not usually
              needed except by a file system wizard who is examining the remains  of  a  very  badly
              corrupted file system.

       -o blocksize=blocksize
              use blocks of blocksize bytes when examining the file system.  This option is not usu‐
              ally needed except by a file system wizard who is examining  the  remains  of  a  very
              badly corrupted file system.

       -f     force  dumpe2fs to display a file system even though it may have some file system fea‐
              ture flags which dumpe2fs may not understand (and which can cause some  of  dumpe2fs's
              display to be suspect).

       -g     display  the  group descriptor information in a machine readable colon-separated value
              format.  The fields displayed are the group number; the number of the first  block  in
              the group; the superblock location (or -1 if not present); the range of blocks used by
              the group descriptors (or -1 if not present); the block  bitmap  location;  the  inode
              bitmap location; and the range of blocks used by the inode table.

       -h     only  display the superblock information and not any of the block group descriptor de‐
              tail information.

       -i     display the file system data from an image file created by e2image,  using  device  as
              the pathname to the image file.

       -m     If the mmp feature is enabled on the file system, check if device is in use by another
              node, see e2mmpstatus(8) for full details.  If used together with the -i option,  only
              the MMP block information is printed.

       -x     print the detailed group information block numbers in hexadecimal format

       -V     print the version number of dumpe2fs and exit.

EXIT CODE
       dumpe2fs  exits  with  a return code of 0 if the operation completed without errors.  It will
       exit with a non-zero return code if there are any errors, such as problems  reading  a  valid
       superblock, bad checksums, or if the device is in use by another node and -m is specified.

BUGS
       You may need to know the physical file system structure to understand the output.

AUTHOR
       dumpe2fs was written by Remy Card <Remy.Card AT linux.org>.  It is currently being maintained by
       Theodore Ts'o <tytso AT alum.edu>.

AVAILABILITY
       dumpe2fs is part of the e2fsprogs package  and  is  available  from  http://e2fsprogs.source‐
       forge.net.

SEE ALSO
       e2fsck(8), e2mmpstatus(8), mke2fs(8), tune2fs(8).  ext4(5)




E2fsprogs version 1.46.5                    December 2021                                DUMPE2FS(8)