1.\" Copyright (c) 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)lfs_cleanerd.8 8.2 (Berkeley) 12/11/93 33.\" 34.Dd "December 11, 1993" 35.Dt LFS_CLEANERD 8 36.Os BSD 4.4 37.Sh NAME 38.Nm lfs_cleanerd 39.Nd garbage collect a log-structured file system 40.Sh SYNOPSIS 41.Nm lfs_cleanerd 42.Op Fl ds 43.Pa node 44.Sh DESCRIPTION 45The 46.Nm lfs_cleanerd 47command starts a daemon process which garbage-collects 48the log-structured file system residing at the point named by 49.Ar node 50in the global file system namespace. 51This command is normally executed by 52.Xr mount_lfs 8 53when the log-structured file system is mounted. 54The daemon will exit within a few minutes 55of when the file system it was cleaning is unmounted. 56.Pp 57Garbage collection on a log-structured file system is done by scanning 58the file system's segments for active, i.e. referenced, data and copying 59it to new segments. 60When all of the active data in a given segment has been copied to a new 61segment that segment can be marked as empty, thus reclaiming the space 62taken by the inactive data which was in it. 63.Pp 64The following options are available: 65.Bl -tag -width indent 66.It Fl d 67Run in debug mode. 68Do not become a daemon process, and print debugging information. 69.It Fl s 70When cleaning the file system, read data in small chunks. 71.El 72.Sh SEE ALSO 73.Xr mount_lfs 8 74.Sh HISTORY 75The 76.Nm lfs_cleanerd 77utility first appeared in 4.4BSD. 78