[CFR][ZFS] Allow async event processing with a R/O root FS

[Pawel Jakub Dawidek]

On Tue, Jun 14, 2011 at 04:45:06PM -0600, Justin T. Gibbs wrote:
> Allow ZFS asynchronous event handling to proceed even if the
> root file system is mounted read-only.  This restriction appears
> to have been put in place to avoid errors with updating the
> configuration cache file.  However:
> 
>   o The majority of asynchronous event handling does not involve
>     configuration cache file updates.
>   o The configuration cache file need not be on the root file system,
>     so the check was not complete.

Why is that? I keep cache file on the ZFS root file system.
It is not used by the boot loader, but is loaded by the loader:

	# tail -7 /boot/defaults/loader.conf

-- 
Pawel Jakub Dawidek                       http://www.wheelsystems.com
FreeBSD committer                         http://www.FreeBSD.org
Am I Evil? Yes, I Am!                     http://yomoli.com
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