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78 lines
3.1 KiB
Groff
78 lines
3.1 KiB
Groff
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.\" Copyright (c) 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)lfs_cleanerd.8 8.2 (Berkeley) 12/11/93
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.\"
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.Dd "December 11, 1993"
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.Dt LFS_CLEANERD 8
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.Os BSD 4.4
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.Sh NAME
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.Nm lfs_cleanerd
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.Nd garbage collect a log-structured file system
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.Sh SYNOPSIS
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.Nm lfs_cleanerd
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.Op Fl ds
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.Pa node
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.Sh DESCRIPTION
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The
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.Nm lfs_cleanerd
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command starts a daemon process which garbage-collects
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the log-structured file system residing at the point named by
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.Ar node
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in the global file system namespace.
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This command is normally executed by
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.Xr mount_lfs 8
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when the log-structured file system is mounted.
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The daemon will exit within a few minutes
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of when the file system it was cleaning is unmounted.
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.Pp
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Garbage collection on a log-structured file system is done by scanning
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the file system's segments for active, i.e. referenced, data and copying
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it to new segments.
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When all of the active data in a given segment has been copied to a new
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segment that segment can be marked as empty, thus reclaiming the space
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taken by the inactive data which was in it.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl d
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Run in debug mode.
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Do not become a daemon process, and print debugging information.
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.It Fl s
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When cleaning the file system, read data in small chunks.
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.El
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.Sh SEE ALSO
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.Xr mount_lfs 8
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.Sh HISTORY
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The
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.Nm lfs_cleanerd
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utility first appeared in 4.4BSD.
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