iokit sync #106
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iokit sync #106
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IS_EMPTY macro does not catch case where tqent_prev and tqent_next are NULL
Allow kstat.zfs.darwin.tunable.use_system_sync to control whether we use the post-10.11 IOKit barrier sync or not. Do not call the synchronize method a second time in the same invocation of handle_sync_iokit. Log the IOReturn error.
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The handle_sync_iokit commit needs @me eyeballs on what should be passed
upwards in the event of failure, and whether recovery can be done cleverly in
some caller.