nilfs-clean man page

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, respectively.

-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

See Also

nilfs(8), nilfs_cleanerd(8).

Referenced By


Apr 2014 nilfs-utils version 2.2