[Bug 229829] [zfs] scrubbing prevents shutdown and slows down startup

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229829

--- Comment #5 from Martin Birgmeier <d8zNeCFG@aon.at> ---
Just my 2 cents: For the issue described in this PR it would be necessary to
suspend an ongoing scrub before shutdown and resume it after restart - assuming
the system does both (especially the shutdown) cleanly.

Most likely something like a "reverse" rc.d would be neeeded, where the
shutdown procedure checks which zpools are currently being scrubbed, saves this
info, and then suspends the scrubs; conversely, the startup would need to check
which scrubs were suspended and resume them.

To not need a separate file for saving the info about which zpools were in the
process of being scrubbed across the shutdown/reboot it would be nice to be
able to do some query directly on the pool to obtain this information.

-- Martin

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