Most of the documentation is a snapshot of the old Namesys site (, 2007-09-29).

There was also a Reiser4 Wiki (, 2007-07-06) once on

Reiser4 development appears to have stalled and ReiserFS is deprecated and scheduled to be removed from mainline Linux in 2025.


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debugreiserfs - The debugging tool for the ReiserFS filesystem.


 debugreiserfs [ -dDJmoqpuSV ] [ -j device ] [ -B file ] [ -1 N ] device


debugreiserfs sometimes helps to solve problems with ReiserFS filesystems. When run without options it prints the super block of the ReiserFS filesystem found on the device.

device is the special file corresponding to the device (e.g /dev/hdXX for an IDE disk partition or /dev/sdXX for a SCSI disk partition).


 -j device prints the contents of the journal. The option -p allows
    it to pack the journal with other metadata into the archive.
 -J prints the journal header.
 -d prints the formatted nodes of the internal tree of the filesystem.
 -D prints the formatted nodes of all used blocks of the filesystem.
 -m prints the contents of the bitmap (slightly useful).
 -o prints the objectid map (slightly useful).
 -B file takes the list of bad blocks stored in the internal 
             ReiserFS tree and translates it into an ascii list
             written to the specified file.
 -1 blocknumber prints the specified block of the filesystem.
 -p extracts the filesystem's metadata with debugreiserfs -p /dev/xxx | gzip -c > xxx.gz.
    None of your data are packed unless a filesystem corruption presents 
    when the whole block having this corruption is packed. You send us the output,
    and we use it to create a filesystem with the same strucure as yours 
    using debugreiserfs -u. When the data file is not too large,
    this usually allows us to quickly reproduce and debug the problem.
 -u builds the ReiserFS filesystem image with 
    gunzip -c xxx.gz | debugreiserfs -u /dev/image
    of the previously packed metadata with debugreiserfs -p.
    The result image is not the same as the original filesystem, 
    because mostly only metadata were packed with debugreiserfs -p,
    but the filesystem structure is completely recreated.
 -S When -S is not specified, -p deals with blocks marked used in
    the filesystem bitmap only. With this option set debugreiserfs
    will work with the entire device.
 -q When -p is in use, suppress showing the speed of progress.


This version of debugreiserfs has been written by Vitaly Fertman.


Please report bugs to the ReiserFS developers <>, providing as much information as possible - your hardware, kernel, patches, settings, all printed messages; check the syslog file for any related information.


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