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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	 e2im-
	      age, 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@linux.org>.  It is cur-
       rently being maintained by Theodore Ts'o	<tytso@alum.mit.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)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXIT CODE | BUGS | AUTHOR | AVAILABILITY | SEE ALSO

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