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+.\"
+.\" Copyright (c) 2007, Sun Microsystems, Inc.  All Rights Reserved
+.\" Copyright 2021 Oxide Computer Company
+.\"
+.\" The contents of this file are subject to the terms of the
+.\" Common Development and Distribution License (the "License").
+.\" You may not use this file except in compliance with the License.
+.\"
+.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+.\" or http://www.opensolaris.org/os/licensing.
+.\" See the License for the specific language governing permissions
+.\" and limitations under the License.
+.\"
+.\" When distributing Covered Code, include this CDDL HEADER in each
+.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+.\" If applicable, add the following below this CDDL HEADER, with the
+.\" fields enclosed by brackets "[]" replaced with your own identifying
+.\" information: Portions Copyright [yyyy] [name of copyright owner]
+.\"
+.Dd November 28, 2007
+.Dt DCFS 4FS
+.Os
+.Sh NAME
+.Nm dcfs
+.Nd Compression file system
+.Sh SYNOPSIS
+.In sys/filio.h
+.In sys/fs/decomp.h
+.Sh DESCRIPTION
+The
+.Nm
+filesystem is a layered filesystem that you use to compress data when writing to
+a file and decompress upon read.
+The primary function of the
+.Nm
+filesystem is to compress individual files when constructing a boot archive and
+when reading or booting from the archive.
+.Sh INTERFACE STABILITY
+.Sy Uncommitted
+.Sh SEE ALSO
+.Xr ufs 4FS ,
+.Xr attributes 7 ,
+.Xr boot 8 ,
+.Xr bootadm 8 ,
+.Xr fiocompress 8
+.Sh NOTES
+The
+.Nm
+compression/decompression file system works only with UFS.