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Chunwei Chen
aa159afb56
Currently, vdev_disk_physio_completion will try to wake up an waiter without first checking the existence. This creates a race window in which complete is called after dr is freed. We add dr_wait in dio_request to indicate the existence of waiter. Also, remove dr_rw since no one is using it, and reorder dr_ref to make the struct more compact in 64bit. Signed-off-by: Chunwei Chen <david.chen@osnexus.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #3917 Issue #3880