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Date:      Wed, 20 Jun 2001 17:02:51 +0300
From:      Peter Pentchev <roam@orbitel.bg>
To:        Jeroen Ruigrok/Asmodai <asmodai@FreeBSD.org>
Cc:        Ian Dowse <iedowse@maths.tcd.ie>, freebsd-bugs@FreeBSD.org
Subject:   Re: kern/765: umount -f can`t umount a NFS filesystem in use
Message-ID:  <20010620170251.B794@ringworld.oblivion.bg>
In-Reply-To: <20010620155109.G49400@daemon.ninth-circle.org>; from asmodai@FreeBSD.org on Wed, Jun 20, 2001 at 03:51:09PM %2B0200
References:  <200106201315.f5KDFZB73481@freefall.freebsd.org> <200106201427.aa85395@salmon.maths.tcd.ie> <20010620155109.G49400@daemon.ninth-circle.org>

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On Wed, Jun 20, 2001 at 03:51:09PM +0200, Jeroen Ruigrok/Asmodai wrote:
> -On [20010620 15:31], Ian Dowse (iedowse@maths.tcd.ie) wrote:
> >In message <200106201315.f5KDFZB73481@freefall.freebsd.org>, asmodai@FreeBSD.or
> >g writes:
> >>Synopsis: umount -f can`t umount a NFS filesystem in use
> >>
> >>Responsible-Changed-From-To: asmodai->freebsd-bugs
> >
> >This has been fixed in -current (revision 1.312 of vfs_subr.c and
> >associated changes), but is still a problem in -stable. A direct
> >MFC would require the recompilation of all filesystem modules, and
> >minor source changes to any filesystems maintained outside the
> >tree.
> >
> >Is this likely to cause problems? If so, an alternative would be
> >a workaround that would just fix the NFS case. I'd prefer to reduce
> >rather than increase the differences between the branches if possible
> >though.
> 
> I'd prefer to have this fixed as well, rather than documented as a
> caveat.
> 
> Since it seems to counterproductive to not being able to use umount -f
> on NFS mounts.  I know I have had to use this in the past due to
> networks bouncing up and down.
> 
> And a recompile is worth it in my opinion.
> 
> I am interested in good arguments _NOT_ to fix this.

I'd love to have umount -f functionality.  I'd absolutely LOVE to.
(think NFS server on a laptop, and hung NFS mounts after the laptop
 is physically removed..)

However, people might start speaking about ABI changes in -stable :(

G'luck,
Peter

-- 
If wishes were fishes, the antecedent of this conditional would be true.

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