.\" Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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.\" $FreeBSD$
.\"
.Dd April 22, 2013
.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 destroy
.Op Fl fv
.Ar name ...
.Nm
.Cm label
.Op Fl v
.Ar name
.Ar dev
.Nm
.Cm stop
.Op Fl fv
.Ar name ...
.Nm
.Cm clear
.Op Fl v
.Ar dev ...
.Nm
.Cm dump
.Ar dev ...
.Nm
.Cm list
.Nm
.Cm status
.Nm
.Cm load
.Nm
.Cm unload
.Sh DESCRIPTION
The
.Nm
utility is used for GEOM provider labelization.
A label can be set up 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 uses on-disk metadata to store the label and detect it automatically in
the future.
.Pp
This GEOM class also provides 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 volume names (directory
.Pa /dev/ufs/ ) .
.It
UFS2 volume names (directory
.Pa /dev/ufs/ ) .
.It
UFS1 file system IDs (directory
.Pa /dev/ufsid/ ) .
.It
UFS2 file system IDs (directory
.Pa /dev/ufsid/ ) .
.It
MSDOSFS (FAT12, FAT16, FAT32) (directory
.Pa /dev/msdosfs/ ) .
.It
CD ISO9660 (directory
.Pa /dev/iso9660/ ) .
.It
EXT2FS (directory
.Pa /dev/ext2fs/ ) .
.It
REISERFS (directory
.Pa /dev/reiserfs/ ) .
.It
NTFS (directory
.Pa /dev/ntfs/ ) .
.El
.Pp
Support for partition metadata is implemented for:
.Pp
.Bl -bullet -offset indent -compact
.It
GPT labels (directory
.Pa /dev/gpt/ ) .
.It
GPT UUIDs (directory
.Pa /dev/gptid/ ) .
.El
.Pp
Generic 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
Set up a label
.Ar name
for the given provider.
This is the
.Dq automatic
method, where metadata is stored in a provider's last sector.
The kernel module
.Pa geom_label.ko
will be loaded if it is not loaded already.
.It Cm stop
Turn off the given label by its
.Ar name .
This command does not touch on-disk metadata!
.It Cm destroy
Same as
.Cm stop .
.It Cm clear
Clear metadata on the given devices.
.It Cm dump
Dump metadata stored on the given devices.
.It Cm list
See
.Xr geom 8 .
.It Cm status
See
.Xr geom 8 .
.It Cm load
See
.Xr geom 8 .
.It Cm unload
See
.Xr geom 8 .
.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 SYSCTL VARIABLES
The following
.Xr sysctl 8
variables can be used to control the behavior of the
.Nm LABEL
GEOM class.
The default value is shown next to each variable.
.Bl -tag -width indent
.It Va kern.geom.label.debug : No 0
Debug level of the
.Nm LABEL
GEOM class.
This can be set to a number between 0 and 2 inclusive.
If set to 0 minimal debug information is printed, and if set to 2 the
maximum amount of debug information is printed.
.El
.Sh EXIT STATUS
Exit status is 0 on success, and 1 if the command fails.
.Sh EXAMPLES
The following example shows how to set up a label for disk
.Dq Li 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
[...]
umount /usr
glabel stop usr
glabel unload
.Ed
.Pp
The next example shows how to set up a label for a UFS file system:
.Bd -literal -offset indent
tunefs -L data /dev/da4s1a
mount /dev/ufs/data /mnt/data
.Ed
.Sh SEE ALSO
.Xr geom 4 ,
.Xr loader.conf 5 ,
.Xr geom 8 ,
.Xr mount 8 ,
.Xr newfs 8 ,
.Xr sysctl 8 ,
.Xr tunefs 8 ,
.Xr umount 8
.Sh HISTORY
The
.Nm
utility appeared in
.Fx 5.3 .
.Sh AUTHORS
.An Pawel Jakub Dawidek Aq pjd@FreeBSD.org