NILFS-CLEAN(8)              System Manager's Manual             NILFS-CLEAN(8)

       nilfs-clean - run garbage collector on NILFS file system

       nilfs-clean [options] [device]

       The nilfs-clean program communicates with nilfs_cleanerd(8) program and
       controls execution of garbage collection (GC) on NILFS2 file systems.
       It can be used to manually run garbage collection of a file system
       mounted on device to increase the free space.

       If a GC command is specified by one of the following options (i.e.
       ´-c´,´-s´,´-r´, and ´-l´ options), the command is sent to and performed
       on the nilfs_cleanerd(8) program.  If no commands are specified, nilfs-
       clean just triggers a one-pass cleaning.

       When device is omitted, nilfs-clean selects an active NILFS2 file
       system in the system.

       This command is valid only for mounted NILFS2 file systems, and will
       fail if the device has no active mounts.

       -b, --break, --stop
              Stop garbage collection.

       -c, --reload[=conffile]
              Request reloading config file to cleaner process.  If an
              optional configuration file is given, the file is read by
              nilfs_cleanerd(8) program and cleaner configuration is reset to
              the information.  If no argument is given, a configuration file
              selected by nilfs_cleanerd(8) will be reloaded.

       -l, --status
              Display cleaner status.

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

       -m, --min-reclaimable-blocks=COUNT[%]
              Specify the minimum number of reclaimable blocks in a segment
              before it can be cleaned. If the argument is followed by a
              percent sign, it represents the ratio of blocks in a segment.
              This argument will only have an effect if the use_set_suinfo
              flag is set in the configuration file.

       -p, --protection-period=interval
              Set protection period for a cleaner run.  The interval parameter
              is an integer value and specifies the minimum time that deleted
              or overrode data will be preserved in the file system.  Smaller
              values will increase free space made by garbage collection.
              Optionally, the interval 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,

       -q, --quit
              Shutdown cleaner daemon.

       -r, --resume
              Resume garbage collection.

       -s, --suspend
              Suspend garbage collection.  Note that if users manually suspend
              garbage collection with this option, it will not restart
              automatically until user resumes the garbage collection.

       -S, --speed=COUNT[/SECONDS]
              Set garbage collection speed for a cleaner run.

       -v, --verbose
              Verbose mode.

       -V, --version
              Display version and exit.

       Ryusuke Konishi <>

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

       nilfs(8), nilfs_cleanerd(8).

nilfs-utils version 2.2            Apr 2014                     NILFS-CLEAN(8)