lssu (1) - Linux Man Pages
lssu: list usage state of NILFS2 segments
lssu - list usage state of NILFS2 segments
is a utility for displaying usage state of NILFS2 segments in
, where a segment is contiguous lump of disk blocks and
an allocation unit of NILFS2 disk space. When device
is examined to find a NILFS2 file system.
This command will fail if the device has no active mounts of a
NILFS2 file system.
Do not hide clean segments.
- -i index
Skip index segments at start of input.
- -n lines
List only lines input segments.
Display help message and exit.
Every line of the lssu
output consists of the following fields:
State of the segment. It consists of three flags whose meaning is
The segment is active, meaning that it is recently created and cannot
be reclaimed by the garbage collector.
The segment is dirty, meaning that it is in use.
The segment is erroneous, meaning that it has once caused an I/O
error. NILFS2 avoids allocating the segments with this flag.
Number of in-use blocks of the segment.
Koji Sato <koji [at] osrg.net>
is part of the nilfs-utils package and is available from