1 .\" Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
2 .\" All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that the following conditions
7 .\" 1. Redistributions of source code must retain the above copyright
8 .\" notice, this list of conditions and the following disclaimer.
9 .\" 2. Redistributions in binary form must reproduce the above copyright
10 .\" notice, this list of conditions and the following disclaimer in the
11 .\" documentation and/or other materials provided with the distribution.
13 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
14 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
17 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 .Nd "disk labelization control utility"
70 utility is used for GEOM provider labelization.
71 A label can be set up on a GEOM provider in two ways:
77 method, no metadata are stored on the devices, so a label has to be configured
78 by hand every time it is needed.
81 method uses on-disk metadata to store the label and detect it automatically in
84 This GEOM class also provides volume label detection for file systems.
85 Those labels cannot be set with
87 but must be set with the appropriate file system utility, e.g.\& for UFS
88 the file system label is set with
90 Currently supported file systems are:
92 .Bl -bullet -offset indent -compact
94 UFS1 volume names (directory
97 UFS2 volume names (directory
100 UFS1 file system IDs (directory
103 UFS2 file system IDs (directory
106 MSDOSFS (FAT12, FAT16, FAT32) (directory
107 .Pa /dev/msdosfs/ ) .
109 CD ISO9660 (directory
110 .Pa /dev/iso9660/ ) .
116 .Pa /dev/reiserfs/ ) .
122 Support for partition metadata is implemented for:
124 .Bl -bullet -offset indent -compact
126 GPT labels (directory
133 Generic disk ID strings are exported as labels in the format
134 .Pa /dev/diskid/GEOM_CLASS-ident
136 .Pa /dev/diskid/DISK-6QG3Z026 .
138 Generic labels created and managed solely by
144 Note that for all label types, nested GEOM classes will cause additional
145 device nodes to be created, with context-specific data appended to their
146 names. E.g. for every node like
147 .Pa /dev/label/bigdisk
148 there will be additional entries for any partitions which the device
150 .Pa /dev/label/bigdiskp1
152 .Pa /dev/label/bigdiskp1a .
154 The first argument to
156 indicates an action to be performed:
157 .Bl -tag -width ".Cm destroy"
159 Create temporary label
161 for the given provider.
167 will be loaded if it is not loaded already.
171 for the given provider.
174 method, where metadata is stored in a provider's last sector.
177 will be loaded if it is not loaded already.
179 Turn off the given label by its
181 This command does not touch on-disk metadata!
186 Clear metadata on the given devices.
188 Dump metadata stored on the given devices.
204 .Bl -tag -width indent
206 Force the removal of the specified labels.
213 variables can be used to control the behavior of the
216 The default value is shown next to each variable.
217 .Bl -tag -width indent
218 .It Va kern.geom.label.debug : No 0
222 This can be set to a number between 0 and 2 inclusive.
223 If set to 0 minimal debug information is printed, and if set to 2 the
224 maximum amount of debug information is printed.
226 .Bl -tag -width indent
227 .It Va kern.geom.label.*.enable : No 1
230 providers implement a
232 flag and a tunable variable named in the above format. This flag
233 controls if the label provider will be active, tasting devices
234 and creating label nodes in the
236 tree. It is sometimes desirable to disable certain label types if
237 they conflict with other classes in complex GEOM topologies.
240 Exit status is 0 on success, and 1 if the command fails.
242 The following example shows how to set up a label for disk
244 create a file system on it, and mount it:
245 .Bd -literal -offset indent
246 glabel label -v usr /dev/da2
248 mount /dev/label/usr /usr
255 The next example shows how to set up a label for a UFS file system:
256 .Bd -literal -offset indent
257 tunefs -L data /dev/da4s1a
258 mount /dev/ufs/data /mnt/data
275 .An Pawel Jakub Dawidek Aq Mt pjd@FreeBSD.org