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List:       freebsd-hackers
Subject:    Re: tunefs.8 oddity
From:       Stefan Esser <se () freebsd ! org>
Date:       2007-07-21 0:17:10
Message-ID: 46A15086.2060505 () FreeBSD ! org
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Julian Elischer wrote:
> Stefan Esser wrote:
>> Maxim Konovalov wrote:
>>> On Fri, 20 Jul 2007, 23:21+0800, Xin LI wrote:
>>>> Any chance that we resolve the bug instead of documenting it? :-)
>>>>
>>> Personally, I have no energy/time for that.  It was documented for
>>> ages, it is still documented in other BSDs.
>>
>> It has long ago been converted to a mount option instead of a
>> tunefs command in NetBSD. My FreeBSD systems are patched that
>> way since shortly after soft-updates was committed (long before
>> it became available in NetBSD, IIRC); I have not checked whether
>> they used the (very simple) patches I had posted at that time.
>>
>> Controlling soft-updates during mount has many advantages (not
>> only if you decide to enable it on a root file-system that had
>> been created without it) and no disadvantages.
>>
>
> As the person who added this originally on behalf of Kirk,
> I think the time for this has probably come.
> I think even Kirk has said this might now make sense but I'd check
> with him first.

I had asked him and he replied that the mount option was better.
But when I discussed this in a FreeBSD list, there was strong
opposition and it was claimed, that sysinstall took care of it
in such a way, that the users would not miss the mount option.

I had strong arguments in favour of the mount option, but since
there were different opinions that were strongly voiced, I just
gave up and maintained the changes locally to this day.

The arguments (of both sides) can be found in the mail archives.

I think this change should have been made long before 7.0 (it
could have been in 5.0 without problems). But I guess that ZFS
will attract many previous UFS2/soft-updates users (I have
converted most of my systems to ZFS with quite satisfactory
results and could now live without soft-updates) and that the
relevance of soft-updates will shrink for that reason. So if
it is not changed in 7.0, I won't keep my local patches, since
there will be no UFS file system on my systems (I'm using a
ZFS root partition and have only a UFS boot partition).

Regards, STefan
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