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From: bugzilla-noreply@freebsd.org
To: bugs@FreeBSD.org
Subject: [Bug 113912] tunefs(8): silent failure setting glabel on boot
 partition
Date: Thu, 09 Apr 2026 14:08:09 +0000
Message-ID: <bug-113912-227-YwC1vGtWEM@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-113912-227@https.bugs.freebsd.org/bugzilla/>
References: <bug-113912-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D113912

--- Comment #5 from rkoberman@gmail.com ---
Wow! I had to spend some time remembering this.

I think that this stems from confusion between the three types of labels th=
at
are related to disks and disk partitions.

tunefs(8) sets the gpt label which is not the glabel. The GPT label is crea=
ted
when a partition is created by gpart(8). I have never had any issue using
tunefs(8) -L option to modify it. The glabel is a GEOM tool and not related=
 to
GPT.

While I am sure that there are other uses for glabel (set and modified by t=
he
glabel(8) command), I have only used it for labeling swap partitions. GPT
labels are specified in the specification for GPT and is used by almost all
disk configuration while glabel is part of the FreeBSD GEOM system and us o=
nly
relevant to that system which, as far as I understand it, limited to BSD and
not Linux, Windows, or any other system. I am not use if all BSDs use it.

THe fact that GPT and GEOM both start with 'G' and are tied to disc structu=
re
has caused a lot of confusion, but I thought it had quieted down.

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