.\" Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
.\" All rights reserved.
.\"
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.\" $FreeBSD$
.\"
.Dd Jul 2, 2004
.Dt GLABEL 8
.Os
.Sh NAME
.Nm glabel
.Nd "disk labelization control utility"
.Sh SYNOPSIS
.Nm
.Cm create
.Op Fl v
.Ar name
.Ar dev
.Nm
.Cm label
.Op Fl v
.Ar name
.Ar dev
.Nm
.Cm destroy
.Op Fl fv
.Ar name
.Op Ar name Op Ar ...
.Nm
.Cm clear
.Op Fl v
.Ar dev
.Op Ar dev Op Ar ...
.Nm
.Cm list
.Op Ar prov Op Ar ...
.Nm
.Cm load
.Op Fl v
.Nm
.Cm unload
.Op Fl v
.Sh DESCRIPTION
The
.Nm
utility is used for GEOM providers labelization.
A label can be setup on a GEOM provider in two ways:
.Dq manual
or
.Dq automatic .
When using the
.Dq manual
method, no metadata are stored on the devices, so a label has to be configured
by hand every time it is needed.
The
.Dq automatic
method use on-disk metadata to store label and detect it automatically in the
future.
.Pp
This class also provide volume label detection for file systems.
Those labels cannot be set with
.Nm ,
but must be set with the appropriate file system utility, e.g. for UFS
the file system label is set with
.Xr tunefs 8 .
Currently supported file systems are:
.Pp
.Bl -bullet -offset indent -compact
.It
UFS1 (directory
.Pa /dev/ufs/ ) .
.It
UFS2 (directory
.Pa /dev/ufs/ ) .
.It
MSDOSFS (FAT12, FAT16, FAT32) (directory
.Pa /dev/msdosfs/ ) .
.It
CD ISO9660 (directory
.Pa /dev/iso9660/ ) .
.El
.Pp
Non file-system labels are created in the directory
.Pa /dev/label/ .
.Pp
The first argument to
.Nm
indicates an action to be performed:
.Bl -tag -width ".Cm destroy"
.It Cm create
Create temporary label
.Ar name
for the given provider.
This is the
.Dq manual
method.
The kernel module
.Pa geom_label.ko
will be loaded if it is not loaded already.
.It Cm label
Setup a label
.Ar name
for the given provider.
This is the
.Dq automatic
method, where metadata are stored in provider's last sector.
The kernel module
.Pa geom_label.ko
will be loaded if it is not loaded already.
.It Cm destroy
Turn off the given labels by its
.Ar name .
.It Cm clear
Clear metadata on the given devices.
.It Cm list
List all currently configured devices, or list the given devices.
.It Cm load
Load
.Pa geom_label.ko
kernel module.
.It Cm unload
Unload
.Pa geom_label.ko
kernel module.
.El
.Pp
Additional options:
.Bl -tag -width indent
.It Fl f
Force the removal of the specified labels.
.It Fl v
Be more verbose.
.El
.Sh EXAMPLES
The following example shows how to setup a label for disk da2,
create a file system on it, and mount it:
.Bd -literal -offset indent
glabel label -v usr /dev/da2
newfs /dev/label/usr
mount /dev/label/usr /usr
.Ed
.Pp
The next example shows how to setup a label for a UFS file system:
.Bd -literal -offset indent
tunefs -L data /dev/da4s1a
mount /dev/ufs/data /mnt/data
.Ed
.Sh DIAGNOSTICS
Exit status is 0 on success, and 1 if the command fails.
.Sh SEE ALSO
.Xr geom 4 ,
.Xr geom 8 ,
.Xr mount 8 ,
.Xr newfs 8 ,
.Xr tunefs 8
.Sh HISTORY
The
.Nm
utility appeared in
.Fx 5.3 .
.Sh AUTHORS
.An Pawel Jakub Dawidek Aq pjd@FreeBSD.org