dumpe2fs - dump ext2/ext3/ext4 file system information

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.

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

dumpe2fs prints the super block and blocks group information for the file system present on device.

       The  device  specifier  can  either  be  a  filename  (i.e.,  /dev/sda1),  or  a LABEL or UUID specifier:
       "LABEL=volume-label" or "UUID=uuid".  (i.e., LABEL=home or UUID=e40486c6-84d5-4f2f-b99c-032281799c9d).

       Note: When used with a mounted file system, the printed information may be old or inconsistent.

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.

       dumpe2fs - dump ext2/ext3/ext4 file system information

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

       -osuperblock=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.

       -oblocksize=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.

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

E2fsprogs version 1.47.2                          January 2025                                       DUMPE2FS(8)

dumpe2fs [ -bfghixV ] [ -osuperblock=superblock ] [ -oblocksize=blocksize ] device