input/output error @boot

[Dexuan Cui]

> From: owner-freebsd-current at freebsd.org [mailto:owner-freebsd-
> current at freebsd.org] On Behalf Of Pete Wright
> Sent: Thursday, March 9, 2017 14:04
> To: freebsd-current at freebsd.org
> Subject: Re: input/output error @boot
> On 3/8/17 10:00 PM, Dexuan Cui wrote:
> > For now, I suggest we should only apply the idea "reduce the size of the
> > staging area if necessary" to VM running on Hyper-V, we should restore the
> > old behavior on physical machines since that has been working for people
> > for a long period of time, though it's  potentially unsafe.
> >
> +1
> 
> i'd like to see the old behaviour for physical machines to be restored
> as well since this has rendered my drm-next test rig broken :(
> 
> -pete

Eventually I committed 314956 for the issue:
https://svnweb.freebsd.org/base?view=revision&revision=314956
The old behaviour for physical machines are restored.

PS, I understand usually I should put the patch on phabricator for review,
before it's committed, but since the issue here is critical, I committed it
directly to unblock people first. Sorry.
Please comment on the patch if you think it needs rework  -- I hope not. :-) 

Thanks,
-- Dexuan