Alexander Motin 8acf168aab Fix ZIL records ordering when ZVOL opened both with and without FSYNC.
Before this an earlier writes to a ZVOL opened without FSYNC could get to
ZIL after later writes to the same ZVOL opened with FSYNC.  Fix this by
replicating functionality of ZPL (zv_sync_cnt equivalent to z_sync_cnt),
marking all log records sync if anybody opened the ZVOL with FSYNC.

MFC after:	2 weeks
2016-11-01 16:03:31 +00:00
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