defrag.f2fs man page

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.


-s start block address

Specify the starting block address.

-l number of blocks

Specifiy the number of blocks to move.

-t target block address

Specify the destination block address.

-i direction

Set the direction to left. If it is not set, the direction becomes right by default.

-d debug-level

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://

See Also

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

Referenced By

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