lssu man page on Archlinux

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LSSU(1)								       LSSU(1)

       lssu - list usage state of NILFS2 segments

       lssu [options] [device]

       lssu  is	 a  utility  for  displaying usage state of NILFS2 segments in
       device, where a segment is contiguous lump of disk blocks and an	 allo‐
       cation 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.

       -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.  Option‐
	      ally, the period parameter may be suffixed by one of the follow‐
	      ing  units  designators: ´s´, ´m´, ´h´, ´d´,´w´,´M´, or ´Y´, for
	      seconds, minutes, hours, days, weeks, months, or years,  respec‐

       -V, --version
	      Display version and exit.

       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 cre‐
		     ated 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.

	      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.

       Koji Sato

       lssu  is	 part  of  the	nilfs-utils  package  and  is  available  from

       nilfs(8), dumpseg(8).

nilfs-utils version 2.2		   Apr 2014			       LSSU(1)

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