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.
- -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 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 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.
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 <
[email protected]>. It is
currently being maintained by Theodore Ts'o <
[email protected]>.
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)