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Date:      Fri, 29 May 2009 19:10:37 +0100 (BST)
From:      Robert Watson <rwatson@FreeBSD.org>
To:        Attilio Rao <attilio@freebsd.org>
Cc:        svn-src-head@freebsd.org, Scott Long <scottl@samsco.org>, src-committers@freebsd.org, Edward Tomasz Napierala <trasz@freebsd.org>, svn-src-all@freebsd.org
Subject:   Re: svn commit: r193041 - head/sys/sys
Message-ID:  <alpine.BSF.2.00.0905291909220.48470@fledge.watson.org>
In-Reply-To: <3bbf2fe10905290904o14800df2h2881b3e496ca06cc@mail.gmail.com>
References:  <200905291500.n4TF04HM078212@svn.freebsd.org> <4A2003D4.2010607@samsco.org> <3bbf2fe10905290904o14800df2h2881b3e496ca06cc@mail.gmail.com>

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On Fri, 29 May 2009, Attilio Rao wrote:

> 2009/5/29 Scott Long <scottl@samsco.org>:
>> Occasionally it's useful to be able to run older binaries on newer kernels.
>>  One particularly useful place is for making releases.  Does this change to 
>> struct mount break that?  If so, could there be any other way to achieve 
>> what you want without the breakage?
>
> The struct mount is only accessible by the kernel so it doesn't break 
> userspace binary compatibility.

However, __FreeBSD_version does need to be bumped and UPDATING updated, since 
this change will break file system modules compiled against kernels using 
older versions of struct mount.

Robert N M Watson
Computer Laboratory
University of Cambridge



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