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DEFRAG.F2FS(8) System Manager's Manual DEFRAG.F2FS(8)


defrag.f2fs - relocate blocks in a given area to the specified region


defrag.f2fs [ -s start block address ] [ -l number of blocks ] [ -t target block address ] [ -i direction ] [ -d debugging-level ] device


defrag.f2fs is used to move specified number of blocks starting from a given block address to the target block address with a direction. device is the special file corresponding to the device (e.g. /dev/sdXX).

For example, # defrag.f2fs -s 0x4000 -l 0x100 -t 0x10000 -i /dev/sdb1

This moves blocks between 0x4000 and 0x4100 to the left-hand area of 0x10000.

The exit code returned by defrag.f2fs is 0 on success and -1 on failure.


Specify the starting block address.
Specifiy the number of blocks to move.
Specify the destination block address.
Set the direction to left. If it is not set, the direction becomes right by default.
Specify the level of debugging options. The default number is 0, which shows basic debugging messages.


This version of defrag.f2fs has been written by Jaegeuk Kim <>.


defrag.f2fs is available from git://


mkfs.f2fs(8), dump.f2fs(8), fsck.f2fs(8), resize.f2fs(8), sload.f2fs(8).