dumpe2fs(8)

1DUMPE2FS(8)                 System Manager's Manual                DUMPE2FS(8)
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NAME

6       dumpe2fs - dump ext2/ext3/ext4 filesystem information
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SYNOPSIS

9       dumpe2fs  [  -bfghixV  ]  [  -o  superblock=superblock  ]  [  -o block‐
10       size=blocksize ] device
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DESCRIPTION

13       dumpe2fs prints the super block and blocks group  information  for  the
14       filesystem present on device.
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16       Note:  When used with a mounted filesystem, the printed information may
17       be old or inconsistent.
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OPTIONS

20       -b     print the blocks which are reserved as bad in the filesystem.
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22       -o superblock=superblock
23              use the block superblock when examining  the  filesystem.   This
24              option  is  not usually needed except by a filesystem wizard who
25              is examining the remains of a very badly corrupted filesystem.
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27       -o blocksize=blocksize
28              use blocks of blocksize bytes  when  examining  the  filesystem.
29              This  option is not usually needed except by a filesystem wizard
30              who is examining the remains of a very badly corrupted  filesys‐
31              tem.
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33       -f     force  dumpe2fs  to display a filesystem even though it may have
34              some filesystem feature flags which dumpe2fs may not  understand
35              (and which can cause some of dumpe2fs's display to be suspect).
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37       -g     display  the  group descriptor information in a machine readable
38              colon-separated value format.   The  fields  displayed  are  the
39              group  number;  the  number of the first block in the group; the
40              superblock location (or -1 if not present); the range of  blocks
41              used  by the group descriptors (or -1 if not present); the block
42              bitmap location; the inode bitmap location;  and  the  range  of
43              blocks used by the inode table.
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45       -h     only display the superblock information and not any of the block
46              group descriptor detail information.
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48       -i     display the filesystem data from an image file created by  e2im‐
49              age, using device as the pathname to the image file.
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51       -m     If the mmp feature is enabled on the filesystem, check if device
52              is in use by another node, see e2mmpstatus(8) for full  details.
53              If used together with the -i option, only the MMP block informa‐
54              tion is printed.
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56       -x     print the detailed group information block numbers in  hexadeci‐
57              mal format
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59       -V     print the version number of dumpe2fs and exit.
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EXIT CODE

62       dumpe2fs exits with a return code of 0 if the operation completed with‐
63       out errors.  It will exit with a non-zero return code if there are  any
64       errors,  such as problems reading a valid superblock, bad checksums, or
65       if the device is in use by another node and -m is specified.
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BUGS

68       You may need to know the physical filesystem  structure  to  understand
69       the output.
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AUTHOR

72       dumpe2fs  was  written  by Remy Card <Remy.Card@linux.org>.  It is cur‐
73       rently being maintained by Theodore Ts'o <tytso@alum.mit.edu>.
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AVAILABILITY

76       dumpe2fs is part  of  the  e2fsprogs  package  and  is  available  from
77       http://e2fsprogs.sourceforge.net.
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