DUMPE2FS(8) System Manager's Manual DUMPE2FS(8)

dumpe2fs - dump ext2/ext3/ext4 file system information

dumpe2fs [ -bfghixV ] [ -o superblock=superblock ] [ -o blocksize=blocksize ] device

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.

print the blocks which are reserved as bad in the file system.
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.
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.
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).
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.
only display the superblock information and not any of the block group descriptor detail information.
display the file system data from an image file created by e2image, using device as the pathname to the image file.
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.
print the detailed group information block numbers in hexadecimal format
print the version number of dumpe2fs and exit.

dumpe2fs exits with a return code of 0 if the operation completed 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.

You may need to know the physical file system 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), e2mmpstatus(8), mke2fs(8), tune2fs(8). ext4(5)

May 2024 E2fsprogs version 1.47.1