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 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
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).
-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.
-x print the detailed group information block numbers in
hexadecimal format
-V print the version number of dumpe2fs and exit.
BUGS
You need to know the physical filesystem structure to understand the output.
AUTHOR
dumpe2fs was written by Remy Card <Remy.Card@linux.org>. It is currently 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), mke2fs(8), tune2fs(8). ext4(5)
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