Mark Johnston 4dea20be45 gmirror: Write an updated syncid before queuing writes.
When a syncid bump is pending, any write to the mirror results in the
updated syncid being written to each component's metadata block. However,
the update was only being performed after the writes to the mirror
componenents were queued. Instead, synchronously update the metadata block
first.

MFC after:	3 weeks
Sponsored by:	Dell EMC Isilon
2016-10-06 00:13:55 +00:00
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