kern/157724: [geom] gpart(8) 'add' command must preserve gap for schemes

[Marcel Moolenaar]

The following reply was made to PR kern/157724; it has been noted by GNATS.

From: Marcel Moolenaar <marcel at xcllnt.net>
To: "Andrey V. Elsukov" <ae at FreeBSD.org>
Cc: bug-followup at FreeBSD.org, eirnym at gmail.com,
        Marcel Moolenaar <marcel at FreeBSD.org>
Subject: Re: kern/157724: [geom] gpart(8) 'add' command must preserve gap for schemes
Date: Mon, 27 Jun 2011 11:01:33 -0700

 On Jun 27, 2011, at 10:40 AM, Andrey V. Elsukov wrote:
 
 > On 27.06.2011 20:39, Marcel Moolenaar wrote:
 >>> I am partially agree with you. geom_part_bsd does not protects
 >>> metadata from overwriting. And it is bad for users which are not
 >>> aware about this. Also it is easy to wipe metadata now, when
 >>> first partition of BSD scheme should not always have UFS file
 >>> system.
 >> 
 >> There isn't a lot we can do about it. This is one of those
 >> historical mistakes that you can't fix without breaking with
 >> 30+ years of history. It's not worth the hassle IMO...
 > 
 > Hi, Marcel
 > 
 > I think we can just set gpt_first = 16 in g_part_bsd_create for new
 > tables and for existing tables also set gpt_first = 16 if all partitions
 > don not use this space. Something like this (untested):
 
 You may want to look at /etc/disktab. Are you willing to
 change all entries and deal with the consequences? :-)
 
 -- 
 Marcel Moolenaar
 marcel at xcllnt.net