DUMPE2FS(8) (August 2021) DUMPE2FS(8)
NAME
dumpe2fs - dump ext2/ext3/ext4 file system information
SYNOPSIS
dumpe2fs [ -bfghixV ] [ -o superblock=superblock ] [ -o
blocksize=blocksize ] device
DESCRIPTION
dumpe2fs prints the super block and blocks group information
for the file system present on device.
Note: When used with a mounted file system, the printed
information may be old or inconsistent.
OPTIONS
-b print the blocks which are reserved as bad in the file
system.
-o superblock=superblock
use the block superblock when examining the file sys-
tem. This option is not usually needed except by a
file system wizard who is examining the remains of a
very badly corrupted file system.
-o blocksize=blocksize
use blocks of blocksize bytes when examining the file
system. This option is not usually needed except by a
file system wizard who is examining the remains of a
very badly corrupted file system.
-f force dumpe2fs to display a file system even though it
may have some file system 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 dis-
played 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 file system data from an image file created
by e2image, using device as the pathname to the image
file.
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DUMPE2FS(8) (August 2021) DUMPE2FS(8)
-m If the mmp feature is enabled on the file system, 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 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 com-
pleted 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 file system 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), e2mmpstatus(8), mke2fs(8), tune2fs(8). ext4(5)
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