The debugging tool for the ReiserFS filesystem.


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


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.


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.


reiserfsck(8), mkreiserfs(8)


This version of debugreiserfs has been written by Vitaly Fertman <>.

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