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DUMPE2FS
Section: Maintenance Commands (8) Updated: March 2025 Index
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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.
The
device
specifier can either be a filename (i.e., /dev/sda1), or a LABEL or UUID
specifier: "LABEL=volum-label" or "UUID=uuid". (i.e.,
LABEL=home or UUID=e40486c-84d-4f2-b99-032281799c9d).
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 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.
- -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 colo-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 file system 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 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 completed without errors.
It will exit with a no-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)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- EXIT CODE
-
- BUGS
-
- AUTHOR
-
- AVAILABILITY
-
- SEE ALSO
-
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