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116 lines
3.1 KiB
116 lines
3.1 KiB
4 months ago
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.\" -*- nroff -*-
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.\" Copyright 1993, 1994, 1995 by Theodore Ts'o. All Rights Reserved.
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.\" This file may be copied under the terms of the GNU Public License.
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.\"
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.TH DUMPE2FS 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
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.SH NAME
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dumpe2fs \- dump ext2/ext3/ext4 filesystem information
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.SH SYNOPSIS
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.B dumpe2fs
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[
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.B \-bfghixV
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]
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[
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.B \-o superblock=\fIsuperblock
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]
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[
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.B \-o blocksize=\fIblocksize
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]
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.I device
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.SH DESCRIPTION
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.B dumpe2fs
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prints the super block and blocks group information for the filesystem
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present on
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.I device.
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.PP
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.B Note:
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When used with a mounted filesystem, the printed
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information may be old or inconsistent.
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.SH OPTIONS
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.TP
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.B \-b
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print the blocks which are reserved as bad in the filesystem.
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.TP
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.B \-o superblock=\fIsuperblock
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use the block
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.I superblock
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when examining the filesystem.
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This option is not usually needed except by a filesystem wizard who
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is examining the remains of a very badly corrupted filesystem.
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.TP
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.B \-o blocksize=\fIblocksize
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use blocks of
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.I blocksize
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bytes when examining the filesystem.
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This option is not usually needed except by a filesystem wizard who
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is examining the remains of a very badly corrupted filesystem.
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.TP
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.B \-f
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force dumpe2fs to display a filesystem even though it may have some
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filesystem feature flags which dumpe2fs may not understand (and which
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can cause some of dumpe2fs's display to be suspect).
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.TP
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.B \-g
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display the group descriptor information in a machine readable colon-separated
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value format. The fields displayed are the group number; the number of the
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first block in the group; the superblock location (or -1 if not present); the
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range of blocks used by the group descriptors (or -1 if not present); the block
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bitmap location; the inode bitmap location; and the range of blocks used by the
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inode table.
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.TP
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.B \-h
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only display the superblock information and not any of the block
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group descriptor detail information.
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.TP
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.B \-i
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display the filesystem data from an image file created by
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.BR e2image ,
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using
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.I device
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as the pathname to the image file.
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.TP
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.B \-m
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If the
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.B mmp
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feature is enabled on the filesystem, check if
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.I device
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is in use by another node, see
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.BR e2mmpstatus (8)
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for full details. If used together with the
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.B \-i
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option, only the MMP block information is printed.
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.TP
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.B \-x
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print the detailed group information block numbers in hexadecimal format
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.TP
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.B \-V
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print the version number of
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.B dumpe2fs
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and exit.
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.SH EXIT CODE
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.B dumpe2fs
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exits with a return code of 0 if the operation completed without errors.
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It will exit with a non-zero return code if there are any errors, such
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as problems reading a valid superblock, bad checksums, or if the device
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is in use by another node and
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.B -m
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is specified.
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.SH BUGS
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You may need to know the physical filesystem structure to understand the
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output.
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.SH AUTHOR
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.B dumpe2fs
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was written by Remy Card <Remy.Card@linux.org>. It is currently being
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maintained by Theodore Ts'o <tytso@alum.mit.edu>.
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.SH AVAILABILITY
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.B dumpe2fs
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is part of the e2fsprogs package and is available from
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http://e2fsprogs.sourceforge.net.
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.SH SEE ALSO
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.BR e2fsck (8),
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.BR e2mmpstatus (8),
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.BR mke2fs (8),
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.BR tune2fs (8).
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.BR ext4 (5)
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