NAME

       lssu - list usage state of NILFS2 segments

SYNOPSIS

       lssu [options] [device]

DESCRIPTION

       lssu  is a utility for displaying usage state of NILFS2 segments in device, where a segment is contiguous
       lump of disk blocks and an allocation unit of NILFS2 disk space.  When device is omitted, /proc/mounts is
       examined to find a NILFS2 file system.

       This command will fail if the device has no active mounts of a NILFS2 file system.

OPTIONS

       -a, --all
              Do not hide clean segments.

       -h, --help
              Display help message and exit.

       -i index, --index=index
              Skip index segments at start of input.

       -l, --latest-usage
              Print usage status of the moment.

       -n lines, --lines=lines
              List only lines input segments.

       -p period, --protection-period=period
              Specify  protection period.  This option is used when printing usage status of the moment (with -l
              option) to test if each block in segments is protected and is not  reclaimable.   Optionally,  the
              period  parameter  may  be  suffixed  by  one  of  the following units designators: ´s´, ´m´, ´h´,
              ´d´,´w´,´M´, or ´Y´, for seconds, minutes, hours, days, weeks, months, or years, respectively.

       -V, --version
              Display version and exit.

FIELD DESCRIPTION

       Every line of the lssu output consists of the following fields:

       SEGNUM Segment number.

       DATE   Creation date.

       TIME   Creation time.

       STAT   State of the segment.  It consists of the following flags:

              a      The segment is active, meaning that it is recently created and cannot be reclaimed  by  the
                     garbage collector.

              d      The segment is dirty, meaning that it is in use.

              e      The  segment  is  erroneous,  meaning  that it has once caused an I/O error.  NILFS2 avoids
                     allocating the segments with this flag.

              p (optional)
                     The segment is protected, meaning that garbage collection for the segment is prevented  for
                     some  reason,  for  instance,  the  protection period is not elapsed from its last modified
                     time, the segment is pinned by the file system, or it is erroneous and unreclaimable,  etc.
                     This flag is displayed when -l option is specified.

       NBLOCKS
              Number of in-use blocks of the segment.

       NLIVEBLOCKS (optional)
              Number  and  ratio  of  in-use  blocks  of  the moment.  This field is displayed when -l option is
              specified.

AUTHOR

       Koji Sato

AVAILABILITY

       lssu is part of the nilfs-utils package and is available from http://nilfs.sourceforge.net.

SEE ALSO

       nilfs(8), dumpseg(8).