this gets rid of NO_CCB in vdsk. it considers space on the tx ring as the resource the iopool is managing, but gated by the availability of the service domain. it takes advantage of the newly available scsi_iopool_run() interface to restart io when the domain providing a disk comes back.
this gets rid of NO_CCB in vdsk. it considers space on the tx ring
as the resource the iopool is managing, but gated by the availability
of the service domain. it takes advantage of the newly available
scsi_iopool_run() interface to restart io when the domain providing
a disk comes back.

ok kettenis@

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