dumpe2fs(8)

1DUMPE2FS(8)                 System Manager's Manual                DUMPE2FS(8)
2
3
4

NAME

6       dumpe2fs - dump ext2/ext3/ext4 file system information
7

SYNOPSIS

9       dumpe2fs  [  -bfghixV  ]  [  -o  superblock=superblock  ]  [  -o block‐
10       size=blocksize ] device
11

DESCRIPTION

13       dumpe2fs prints the super block and blocks group  information  for  the
14       file system present on device.
15
16       Note: When used with a mounted file system, the printed information may
17       be old or inconsistent.
18

OPTIONS

20       -b     print the blocks which are reserved as bad in the file system.
21
22       -o superblock=superblock
23              use the block superblock when examining the file  system.   This
24              option  is not usually needed except by a file system wizard who
25              is examining the remains of a very badly corrupted file system.
26
27       -o blocksize=blocksize
28              use blocks of blocksize bytes when examining  the  file  system.
29              This option is not usually needed except by a file system wizard
30              who is examining the remains of a very badly corrupted file sys‐
31              tem.
32
33       -f     force  dumpe2fs to display a file system even though it may have
34              some file system feature flags which dumpe2fs may not understand
35              (and which can cause some of dumpe2fs's display to be suspect).
36
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.
44
45       -h     only display the superblock information and not any of the block
46              group descriptor detail information.
47
48       -i     display the file system data from an image file created by e2im‐
49              age, using device as the pathname to the image file.
50
51       -m     If  the  mmp feature is enabled on the file system, check if de‐
52              vice is in use by another node, see e2mmpstatus(8) for full  de‐
53              tails.   If used together with the -i option, only the MMP block
54              information is printed.
55
56       -x     print the detailed group information block numbers in  hexadeci‐
57              mal format
58
59       -V     print the version number of dumpe2fs and exit.
60

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.
66

BUGS

68       You may need to know the physical file system structure  to  understand
69       the output.
70

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>.
74

AVAILABILITY

76       dumpe2fs is part  of  the  e2fsprogs  package  and  is  available  from
77       http://e2fsprogs.sourceforge.net.
78