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FSEXTINFO(1) General Commands Manual FSEXTINFO(1)

NAME

fsextinfo — determines information about an Extended File System (ext) volume

SYNOPSIS

fsextinfo [-B bodyfile] [-E inode_number] [-F path] [-o offset] [-dhHvV] source

DESCRIPTION

fsextinfo is a utility to determine information about an Extended File System (ext) volume

fsextinfo is part of the libfsext package. libfsext is a library to access the Extended File System (ext) format

source is the source volume.

The options are as follows:

bodyfile
output file system information as a bodyfile
calculate a MD5 hash of a file entry to include in the bodyfile
inode_number
show information about a specific inode or "all"
path
show information about a specific file entry path
shows this help
shows the file system hierarchy
offset
specify the volume offset in bytes
verbose output to stderr
print version

ENVIRONMENT

None

FILES

None

EXAMPLES

# fsextinfo ext4.raw
fsextinfo 20260626

Extended File System information:

Volume information:
        File system                     : ext4
        Label                           : ext4_test
        Compatible features             : 0x0000003c
                Has journal (EXT3_FEATURE_COMPAT_HAS_JOURNAL)
                Have extended inode attributes (EXT2_FEATURE_COMPAT_EXT_ATTR)
                Resizable volume (EXT2_FEATURE_COMPAT_RESIZE_INO)
                Use directory hash index (EXT2_FEATURE_COMPAT_DIR_INDEX)

        Incompatible features           : 0x000002c2
                Has directory type (EXT2_FEATURE_INCOMPAT_FILETYPE)
                Has extents (EXT4_FEATURE_INCOMPAT_EXTENTS)
                Has 64-bit support (EXT4_FEATURE_INCOMPAT_64BIT)
                (EXT4_FEATURE_INCOMPAT_FLEX_BG)

        Read-only compatible features   : 0x0000046a
                Contains large files (EXT2_FEATURE_RO_COMPAT_LARGE_FILE)
                (EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
                (EXT4_FEATURE_RO_COMPAT_DIR_NLINK)
                (EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)
                (EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)

        Number of inodes                : 1024
        Last mount path                 : /mnt/ext4
        Last mount time                 : Jul 22, 2021 14:07:32 UTC
        Last written time               : Jul 22, 2021 14:07:33 UTC

DIAGNOSTICS

Errors, verbose and debug output are printed to stderr when verbose output -v is enabled. Verbose and debug output are only printed when enabled at compilation.

SEE ALSO

fsextmount(1)

AUTHORS

Joachim Metz <joachim.metz@gmail.com>

BUGS

Please report bugs of any kind on the project issue tracker: https://github.com/libyal/libfsext/issues

COPYRIGHT

Copyright (C) 2010-2026, Joachim Metz <joachim.metz@gmail.com>.

This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

June 26, 2026 Linux 6.12.0-160000.37-default