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

NAME
       dumpe2fs - dump ext2/ext3/ext4 filesystem information

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

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

       Note: When used with a mounted filesystem, the printed information may be old or inconsis-
       tent.

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

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

       -o blocksize=blocksize
              use  blocks  of  blocksize bytes when examining the filesystem.  This option is not
              usually needed except by a filesystem wizard who is examining the remains of a very
              badly corrupted filesystem.

       -f     force dumpe2fs to display a filesystem even though it may have some filesystem 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 loca-
              tion; 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
              detail information.

       -i     display the filesystem 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 filesystem, check if device is in use by an-
              other node, see e2mmpstatus(8) for full details.  If used together with the -i  op-
              tion, 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 filesystem 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 1.45.5                   January 2020                               DUMPE2FS(8)

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