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Date: Wed, 1 Jun 2011 15:53:00 -0400 (EDT)
From: Rick Macklem <rmacklem@uoguelph.ca>
To: Bruce Evans <brde@optusnet.com.au>
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Cc: src-committers@FreeBSD.org, svn-src-all@FreeBSD.org,
	svn-src-head@FreeBSD.org, Robert Watson <rwatson@FreeBSD.org>,
	Kostik Belousov <kostikbel@gmail.com>, Rick Macklem <rmacklem@FreeBSD.org>
Subject: Re: svn commit: r222466 - head/sbin/umount
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> 
> Did you have to change VFS_SYNC() to pass the forced-dismount flag? I
> don't like that, but see the problem: VFS_SYNC(XXX_WAIT) should
> normally
> just try to sync everything, but return an error if this is
> impossible,
> but for an nfs server it would take too long to determine that it is
> impossible.
> 
It just checks MNTK_UNMOUNTF being set in mnt_kern_flag.