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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXIT CODE | BUGS | AUTHOR | AVAILABILITY | SEE ALSO | COLOPHON |
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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.
-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 <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
2024-06-14. (At that time, the date of the most recent commit
that was found in the repository was 2024-05-20.) 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 1.47.1 May 2024 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)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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