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+.\" Copyright (c) 2000 Christoph Herrmann, Thomas-Henning von Kamptz
+.\" Copyright (c) 1980, 1989, 1993 The Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" Christoph Herrmann and Thomas-Henning von Kamptz, Munich and Frankfurt.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgment:
+.\"      This product includes software developed by the University of
+.\"      California, Berkeley and its contributors, as well as Christoph
+.\"      Herrmann and Thomas-Henning von Kamptz.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $TSHeader: src/sbin/ffsinfo/ffsinfo.8,v 1.3 2000/12/12 19:30:55 tomsoft Exp $
+.\"
+.Dd January 23, 2025
+.Dt FFSINFO 8
+.Os
+.Sh NAME
+.Nm ffsinfo
+.Nd "dump all meta information of an existing ufs file system"
+.Sh SYNOPSIS
+.Nm
+.Op Fl g Ar cylinder_group
+.Op Fl i Ar inode
+.Op Fl l Ar level
+.Op Fl o Ar outfile
+.Ar special | file
+.Sh DESCRIPTION
+The
+.Nm
+utility extends the
+.Xr dumpfs 8
+utility.
+.Pp
+The output is appended to the file
+.Pa outfile .
+Also expect the output file to be rather large.
+Up to 2 percent of the size of the specified file system is not uncommon.
+.Pp
+The following options are available:
+.Bl -tag -width indent
+.It Fl g Ar cylinder_group
+This restricts the dump to information about this cylinder group only.
+Here
+.Ar 0
+means the first cylinder group and
+.Ar -1
+the last one.
+.It Fl i Ar inode
+This restricts the dump to information about this particular inode only.
+Here the minimum acceptable inode is
+.Ar 2 .
+If this option is omitted but a cylinder group is defined then only inodes
+within that cylinder group are dumped.
+.It Fl l Ar level
+The level of detail which will be dumped.
+This value defaults to
+.Ar 255
+and is the
+.Dq bitwise or
+of the following table:
+.Pp
+.Bl -hang -width indent -compact
+.It Ar 0x001
+initial superblock
+.It Ar 0x002
+superblock copies in each cylinder group
+.It Ar 0x004
+cylinder group summary in initial cylinder group
+.It Ar 0x008
+cylinder group information
+.It Ar 0x010
+inode allocation bitmap
+.It Ar 0x020
+fragment allocation bitmap
+.It Ar 0x040
+cluster maps and summary
+.It Ar 0x100
+inode information
+.It Ar 0x200
+indirect block dump
+.El
+.It Fl o Ar outfile
+This sets the output filename where the dump is written to, and
+must be specified.
+If
+.Fl
+is provided, output will be sent to stdout.
+.El
+.Sh EXAMPLES
+.Dl ffsinfo -o /var/tmp/ffsinfo -l 1023 /dev/md0
+.Pp
+will dump
+.Pa /dev/md0
+to
+.Pa /var/tmp/ffsinfo
+with all available information.
+.Sh SEE ALSO
+.Xr ffs 4 ,
+.Xr dumpfs 8 ,
+.Xr fsck 8 ,
+.Xr gpart 8 ,
+.Xr growfs 8 ,
+.Xr newfs 8 ,
+.Xr tunefs 8
+.Sh HISTORY
+The
+.Nm
+utility first appeared in
+.Fx 4.4 .
+.Sh AUTHORS
+.An Christoph Herrmann Aq Mt chm@FreeBSD.org
+.An Thomas-Henning von Kamptz Aq Mt tomsoft@FreeBSD.org
+.An The GROWFS team Aq Mt growfs@Tomsoft.COM
+.Sh BUGS
+Snapshots are handled like plain files.
+They should get their own level to provide for independent control of the
+amount of what gets dumped.
+It probably also makes sense to some extend to dump the snapshot as a
+file system.