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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXIT CODE | BUGS | AUTHOR | AVAILABILITY | SEE ALSO | COLOPHON |
DUMPE2FS(8) System Manager's Manual DUMPE2FS(8)
dumpe2fs - dump ext2/ext3/ext4 filesystem information
dumpe2fs [ -bfghixV ] [ -o superblock=superblock ] [ -o
blocksize=blocksize ] device
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.
-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.
-m If the mmp feature is enabled on the filesystem, 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 filesystem 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)
This page is part of the e2fsprogs (utilities for ext2/3/4
filesystems) project. Information about the project can be found at
⟨http://e2fsprogs.sourceforge.net/⟩. It is not known how to report
bugs for this man page; if you know, please send a mail to
man-pages@man7.org. This page was obtained from the project's
upstream Git repository
⟨git://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git⟩ on 2020-08-13.
(At that time, the date of the most recent commit that was found in
the repository was 2020-03-21.) If you discover any rendering prob‐
lems in this HTML version of the page, or you believe there is a bet‐
ter or more up-to-date source for the page, or you have corrections
or improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to man-pages@man7.org
E2fsprogs version 1.46-WIP March 2020 DUMPE2FS(8)
Pages that refer to this page: ext2(5) , ext3(5) , ext4(5) , badblocks(8) , debugfs(8) , e2freefrag(8) , e2fsck(8) , e2image(8) , e2mmpstatus(8) , mke2fs(8) , tune2fs(8)