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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 block-
       size=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 inconsistent.
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  filesys-
              tem.
       -f     force  dumpe2fs  to display a filesystem even though it may have
              some filesystem feature 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 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 another node, see e2mmpstatus(8) for full  details.
              If used together with the -i option, only the MMP block informa-
              tion is printed.
       -x     print the detailed group information block numbers in  hexadeci-
              mal format
       -V     print the version number of dumpe2fs and exit.
EXIT CODE
       dumpe2fs exits with a return code of 0 if the operation completed with-
       out 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 cur-
       rently being maintained by Theodore Ts'o <tytso AT alum.edu>.
AVAILABILITY
       dumpe2fs is part  of  the  e2fsprogs  package  and  is  available  from
       http://e2fsprogs.sourceforge.net.
SEE ALSO
       e2fsck(8), e2mmpstatus(8), mke2fs(8), tune2fs(8).  ext4(5)
E2fsprogs version 1.45.6          March 2020                       DUMPE2FS(8)