a3b8d0b40b
Hide all the historical fields of the label, unless people ask for them with -A, set them to intelligently chosen defaults otherwise. Distill the manual page to remove inaccuracies, misundertandings and obsolete information. It can probably still be done better but now at least it is not misinforming people.
473 lines
11 KiB
Groff
473 lines
11 KiB
Groff
.\" Copyright (c) 1987, 1988, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Symmetric Computer Systems.
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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 acknowledgment:
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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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.\" @(#)disklabel.8 8.2 (Berkeley) 4/19/94
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.\" $FreeBSD$
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.\"
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.Dd March 15, 2003
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.Dt BSDLABEL 8
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.Os
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.Sh NAME
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.Nm bsdlabel
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.Nd read and write disk pack label
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.Sh SYNOPSIS
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.Nm
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.Op Fl A
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.Ar disk
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.Nm
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.Fl w
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.Op Fl nA
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.Op Fl B Op Fl b Ar boot
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.Op Fl m Ar machine
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.Ar disk
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.Op Ar type
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.Nm
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.Fl e
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.Op Fl nA
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.Op Fl B Op Fl b Ar boot
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.Op Fl m Ar machine
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.Ar disk
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.Nm
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.Fl R
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.Op Fl nA
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.Op Fl B Op Fl b Ar boot
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.Op Fl m Ar machine
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.Ar disk protofile
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.Pp
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.Sh DESCRIPTION
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The
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.Nm
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utility
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installs, examines or modifies the BSD label on a disk partition.
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In addition,
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.Nm
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can install bootstrap code.
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.Ss Disk Device Name
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When specifying the device,
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the
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.Pa /dev/
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path prefix may be omitted;
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the
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.Nm
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utility will automatically prepend it.
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.Ss General options
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The
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.Fl A
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option enables processing of the historical parts of the BSD label.
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If the option is not given, suitable values are set for these fields.
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.Pp
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The
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.Fl n
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stops the
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.Nm
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program right before the disk would have been modified, and displays
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the result instead of writing it.
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.Pp
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The
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.Fl m Ar machine
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argument instructs
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.Nm
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to use the layout suitable for the specified machine.
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.Ss Reading the Disk Label
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To examine the label on a disk drive, use
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.Nm
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without options:
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.Pp
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.Nm
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.Op Fl A
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.Op Fl m Ar machine
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.Ar disk
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.Pp
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.Ar disk
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represents the disk in question, and may be in the form
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.Pa da0
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or
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.Pa /dev/da0 .
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It will display the partition layout.
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.Ss Writing a Standard Label
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To write a standard label, use the form
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.Pp
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.Nm
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.Fl w
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.Op Fl nA
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.Op Fl m Ar machine
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.Ar disk
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.Op Ar type
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.Pp
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If the drive type if specified the entry of that name in the
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.Xr disktab 5
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file is used, otherwise a default layout is used.
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.Ss Editing an Existing Disk Label
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To edit an existing disk label, use the form
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.Pp
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.Nm
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.Fl e
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.Op Fl nA
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.Op Fl m Ar machine
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.Ar disk
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.Pp
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This command opens the disklabel in the default editor and when the editor
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exits the label is validated and if OK written to disk.
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.Ss Restoring a Disk Label From a File
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To restore a disk label from a file, use the form
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.Pp
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.Nm
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.Fl R
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.Op Fl nA
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.Op Fl m Ar machine
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.Ar disk protofile
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.Pp
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.Nm
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is capable of restoring a disk label that was previously saved in a file in
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.Tn ASCII
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format.
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The prototype file used to create the label should be in the same format as that
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produced when reading or editing a label.
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Comments are delimited by
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.Ql #
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and newline.
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.Ss Installing Bootstraps
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If the
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.Fl B
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argument is specified, bootstrap code will be read from the file
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.Pa /boot/boot
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and written to the disk.
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The
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.Fl b Ar boot
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argument allows a different file to be used.
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.Sh FILES
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.Bl -tag -width ".Pa /etc/disktab" -compact
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.It Pa /boot/boot
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Default boot image.
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.It Pa /etc/disktab
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Disk description file.
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.El
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.Sh SAVED FILE FORMAT
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The
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.Nm
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utility
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uses an
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.Tn ASCII
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version of the label when examining, editing, or restoring a disk
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label.
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The format is:
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.Bd -literal -offset 4n
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8 partitions:
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# size offset fstype [fsize bsize bps/cpg]
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a: 81920 0 4.2BSD 1024 8192 16
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b: 160000 81920 swap
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c: 1173930 0 unused 0 0 # "raw" part, don't edit
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.Ed
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.Pp
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If the
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.Fl A
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option is specified, the format is:
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.Bd -literal -offset 4n
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# /dev/da1c:
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type: SCSI
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disk: da0s1
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label:
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flags:
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bytes/sector: 512
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sectors/track: 51
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tracks/cylinder: 19
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sectors/cylinder: 969
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cylinders: 1211
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sectors/unit: 1173930
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rpm: 3600
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interleave: 1
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trackskew: 0
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cylinderskew: 0
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headswitch: 0 # milliseconds
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track-to-track seek: 0 # milliseconds
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drivedata: 0
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8 partitions:
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# size offset fstype [fsize bsize bps/cpg]
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a: 81920 0 4.2BSD 1024 8192 16
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b: 160000 81920 swap
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c: 1173930 0 unused 0 0 # "raw" part, don't edit
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.Ed
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.Pp
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Lines starting with a
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.Ql #
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mark are comments.
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.Pp
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The partition table can have up to 8 entries.
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It contains the following information:
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.Bl -tag -width indent
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.It Ar #
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The partition identifier is a single letter in the range
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.Ql a
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to
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.Ql h .
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By convention, partition
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.Ql c
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is reserved to describe the entire disk.
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.It Ar size
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The size of the partition in sectors,
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.Cm K
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(kilobytes - 1024),
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.Cm M
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(megabytes - 1024*1024),
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.Cm G
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(gigabytes - 1024*1024*1024),
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.Cm %
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(percentage of free space
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.Em after
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removing any fixed-size partitions other than partition
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.Ql c ) ,
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or
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.Cm *
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(all remaining free space
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.Em after
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fixed-size and percentage partitions).
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For partition
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.Ql c ,
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a size of
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.Cm *
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indicates the entire disk.
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Lowercase versions of
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.Cm K , M ,
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and
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.Cm G
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are allowed.
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Size and type should be specifed without any spaces between them.
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.Pp
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Example: 2097152, 1G, 1024M and 1048576K are all the same size
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(assuming 512-byte sectors).
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.It Ar offset
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The offset of the start of the partition from the beginning of the
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drive in sectors, or
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.Cm *
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to have
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.Nm
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calculate the correct offset to use (the end of the previous partition plus
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one, ignoring partition
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.Ql c .
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For partition
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.Ql c ,
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.Cm *
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will be interpreted as an offset of 0.
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.It Ar fstype
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Describes the purpose of the partition.
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The example shows all currently used partition types.
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For
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.Tn UFS
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file systems and
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.Xr ccd 4
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partitions, use type
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.Cm 4.2BSD .
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For Vinum drives, use type
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.Cm vinum .
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Other common types are
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.Cm swap
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and
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.Cm unused .
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By convention, partition
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.Ql c
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represents the entire slice and should be of type
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.Cm unused ,
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though
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.Nm
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does not enforce this convention.
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The
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.Nm
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utility
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also knows about a number of other partition types,
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none of which are in current use.
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(See the definitions starting with
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.Dv FS_UNUSED
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in
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.Aq Pa sys/disklabel.h
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for more details.)
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.It Ar fsize
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For
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.Cm 4.2BSD
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and
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.Tn LFS
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file systems only, the fragment size.
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Defaults to 1024 for partitions smaller than 1GB,
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4096 for partitions 1GB or larger.
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.It Ar bsize
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For
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.Cm 4.2BSD
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and
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.Tn LFS
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file systems only, the block size.
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Defaults to 8192 for partitions smaller than 1GB,
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16384 for partitions 1GB or larger.
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.It Ar bps/cpg
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For
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.Cm 4.2BSD
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file systems, the number of cylinders in a cylinder group.
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For
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.Tn LFS
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file systems, the segment shift value.
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Defaults to 16 for partitions smaller than 1GB,
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64 for partitions 1GB or larger.
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.El
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.Sh EXAMPLES
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.Dl "bsdlabel da0s1"
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.Pp
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Display the label for the first slice of the
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.Pa da0
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disk, as obtained via
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.Pa /dev/da0s1 .
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.Pp
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.Dl "bsdlabel da0s1 > savedlabel"
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.Pp
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Save the in-core label for
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.Pa da0s1
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into the file
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.Pa savedlabel .
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This file can be used with the
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.Fl R
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option to restore the label at a later date.
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.Pp
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.Dl "bsdlabel -w /dev/da0s1"
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.Pp
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Create a label for
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.Pa da0s1
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.Pp
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.Dl "bsdlabel -e da0s1"
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.Pp
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Read the label for
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.Pa da0s1 ,
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edit it, and install the result.
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.Pp
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.Dl "bsdlabel -e -n da0s1"
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.Pp
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Read the on-disk label for
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.Pa da0s1 ,
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edit it, and display what the new label would be (in sectors).
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It does
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.Em not
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install the new label either in-core or on-disk.
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.Pp
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.Dl "bsdlabel -w da0s1"
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.Pp
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Write a default label on
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.Pa da0s1 .
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Use another
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.Nm Fl e
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command to edit the
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partitioning and file system information.
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.Pp
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.Dl "bsdlabel -R da0s1 savedlabel"
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.Pp
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Restore the on-disk and in-core label for
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.Pa da0s1
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from information in
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.Pa savedlabel .
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.Pp
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.Dl "bsdlabel -R -n da0s1 label_layout"
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.Pp
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Display what the label would be for
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.Pa da0s1
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using the partition layout in
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.Pa label_layout .
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This is useful for determining how much space would be alloted for various
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partitions with a labelling scheme using
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.Cm % Ns -based
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or
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.Cm *
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partition sizes.
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.Pp
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.Dl "bsdlabel -B da0s1"
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.Pp
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Install a new bootstrap on
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.Pa da0s1 .
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The boot code comes from
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.Pa /boot/boot .
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.Pp
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.Dl "bsdlabel -w -B -b newboot /dev/da0s1"
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.Pp
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Install a new label and bootstrap.
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The bootstrap code comes from the file
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.Pa newboot
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in the current working directory.
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.Bd -literal -offset indent
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dd if=/dev/zero of=/dev/da0 bs=512 count=32
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fdisk -BI da0
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dd if=/dev/zero of=/dev/da0s1 bs=512 count=32
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bsdlabel -w -B da0s1
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bsdlabel -e da0s1
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.Ed
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.Pp
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Completely wipe any prior information on the disk, creating a new bootable
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disk with a
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.Tn DOS
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partition table containing one slice, covering the whole disk.
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Initialize the label on this slice,
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then edit it.
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The
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.Xr dd 1
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commands are optional, but may be necessary for some
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.Tn BIOS Ns es
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to properly
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recognize the disk.
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.Pp
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This is an example disk label that uses some of the new partition size types
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such as
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.Cm % , M , G ,
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and
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.Cm * ,
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which could be used as a source file for
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.Dq Li "bsdlabel -R ad0s1c new_label_file" :
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.Bd -literal -offset 4n
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# /dev/ad0s1c:
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8 partitions:
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# size offset fstype [fsize bsize bps/cpg]
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a: 400M 0 4.2BSD 4096 16384 75 # (Cyl. 0 - 812*)
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b: 1G * swap
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c: * * unused
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e: 204800 * 4.2BSD
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f: 5g * 4.2BSD
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g: * * 4.2BSD
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.Ed
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.Sh SEE ALSO
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.Xr geom 4 ,
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.Xr ccd 4 ,
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.Xr md 4 ,
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.Xr disklabel 5 ,
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.Xr disktab 5 ,
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.Xr boot0cfg 8 ,
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.Xr fdisk 8
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.Sh DIAGNOSTICS
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The kernel device drivers will not allow the size of a disk partition
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to be decreased or the offset of a partition to be changed while it is open.
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