Step 2 in fixing bioctl commands intermixed with regular io.
Step 2 in fixing bioctl commands intermixed with regular io.

Add tsleep/wakeup magic to drain IO when a RAID mgmt command wants to run.
Issue RAID mgmt command.
Resume IO.

ok mickey@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars