-*- nroff -*-
Copyright 1993, 1994, 1995 by Theodore Ts'o. All Rights Reserved.
This file may be copied under the terms of the GNU Public License.

dumpe2fs - dump ext2/ext3/ext4 filesystem information dumpe2fs [ -bfhixV ] [ -o superblock=superblock ] [ -o blocksize=blocksize ] device 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.

-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 feature flags which dumpe2fs may not understand (and which can cause some of dumpe2fs's display to be suspect).

-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.

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

-V print the version number of dumpe2fs and exit.

You need to know the physical filesystem structure to understand the output. dumpe2fs was written by Remy Card <Remy.Card@linux.org>. It is currently being maintained by Theodore Ts'o <tytso@alum.mit.edu>. dumpe2fs is part of the e2fsprogs package and is available from http://e2fsprogs.sourceforge.net. e2fsck (8), mke2fs (8), tune2fs (8). ext4 (5)