freebsd-dev/sbin/ffsinfo/ffsinfo.8

.\" 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.
.\" 
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.\" modification, are permitted provided that the following conditions
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.\"    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.
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.\" $TSHeader: src/sbin/ffsinfo/ffsinfo.8,v 1.3 2000/12/12 19:30:55 tomsoft Exp $
.\" $FreeBSD$
.\"
.Dd September 8, 2000
.Dt FSINFO 8
.Os
.Sh NAME
.Nm ffsinfo
.Nd "dump all meta information of an existing ufs file system
.Sh SYNOPSIS
.Nm
.Op Fl L
.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
.Nm Ffsinfo
extends the 
.Xr dumpfs 8
program.
.Pp
The output is generated into the file
.Pa outfile .
Also expect the output file to be rather large.
Up to 2 percent of the size of the specified filesystem is not uncommon.
.Pp
The following options are available:
.Bl -tag -width indent
.It Fl L
Specifying this option skips the tests of the disklabel.
This is done automatically, if the specified filename to dump is a plain file.
.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 0x080
rotational layout tables
.It Ar 0x100
inode information
.It Ar 0x200
indirect block dump
.El
.It Fl o Ar outfile
This allows to change the output filename where the dump is written to.
The current default is
.Pa /var/tmp/ffsinfo .
.El
.Sh EXAMPLES
.Pp
.Dl ffsinfo -l 1023 /dev/vinum/testvol
.Pp
will dump
.Pa /dev/vinum/testvol
with all available information.
.Sh BUGS
Currently
.Nm 
can only dump unmounted file systems.
Do not try dumping a mounted file system, your system may panic and you will
not be able to use the file system any longer.
.Pp
Also 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
filesystem.
.Sh SEE ALSO
.Xr disklabel 8 ,
.Xr dumpfs 8 ,
.Xr fsck 8 ,
.Xr growfs 8 ,
.Xr newfs 8 ,
.Xr tunefs 8 ,
.Xr vinum 8
.Sh AUTHORS
.An Christoph Herrmann Aq chm@FreeBSD.org
.An Thomas-Henning von Kamptz Aq tomsoft@FreeBSD.org
.An The GROWFS team Aq growfs@Tomsoft.COM
.Sh HISTORY
The
.Nm
command first appeared in
.Fx 5.0 .