dumpe2fs(8) — Linux manual page


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

NAME         top

       dumpe2fs - dump ext2/ext3/ext4 file system information

SYNOPSIS         top

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

DESCRIPTION         top

       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         top

       -b     print the blocks which are reserved as bad in the file

       -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.

EXIT CODE         top

       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.

BUGS         top

       You may need to know the physical file system structure to
       understand the output.

AUTHOR         top

       dumpe2fs was written by Remy Card <Remy.Card@linux.org>.  It is
       currently being maintained by Theodore Ts'o <tytso@alum.mit.edu>.

AVAILABILITY         top

       dumpe2fs is part of the e2fsprogs package and is available from

SEE ALSO         top

       e2fsck(8), e2mmpstatus(8), mke2fs(8), tune2fs(8).  ext4(5)

COLOPHON         top

       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
       2023-12-22.  (At that time, the date of the most recent commit
       that was found in the repository was 2023-12-07.)  If you
       discover any rendering problems in this HTML version of the page,
       or you believe there is a better 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 1.47.0      February 2023                  DUMPE2FS(8)

Pages that refer to this page: ext4(5)badblocks(8)debugfs(8)e2freefrag(8)e2fsck(8)e2image(8)e2mmpstatus(8)mke2fs(8)tune2fs(8)