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Date:      Fri, 07 Nov 2008 11:44:27 +0100
From:      Ivan Voras <ivoras@freebsd.org>
To:        freebsd-arch@freebsd.org
Subject:   Re: Directory rename semantics.
Message-ID:  <gf168k$48o$1@ger.gmane.org>
In-Reply-To: <20081106195558.GG2281@submonkey.net>
References:  <20081027193545.GA95872@pin.if.uz.zgora.pl>	<20081028161855.GA45129@zim.MIT.EDU>	<20081106192829.GA98742@pin.if.uz.zgora.pl> <20081106195558.GG2281@submonkey.net>

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Ceri Davies wrote:
> On Thu, Nov 06, 2008 at 08:28:29PM +0100, Edward Tomasz Napierala wrote=
:
>> After discussion about this with rwatson and pjd, I decided to do
>> the opposite: change ZFS behaviour to match UFS.  Reason is simple:
>> this is security, and we want to be conservative here.  It's impossibl=
e
>> to make sure this change wouldn't cause security problems.
>=20
> Perhaps it would have been better to either do nothing or create a zfs
> property that toggled this behaviour so that people who expect ZFS to
> behave a certain way get it.  I'm not sure why we would want all
> filesystems to behave the same way, to be honest.

That would be desirable if we want file system semantics to be a
property of the OS instead of individual file systems. (Though I don't
know if there's ever been a conscious decision about this particular
goal). If so, a knob that toggles between the behaviours should toggle
it for all file systems. Having them behave differently can create
problems in migration to and from ZFS.




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