Will a write(2) to a ZFS file be made durable atomically?

Under the hood in ZFS, writes are committed using either shadow paging or
logging, as I understand it. So I believe that I mean to ask whether a
write(2), pushed to ZPL, and pushed on down the stack, can be split into
multiple transactions? Or, instead, is it guaranteed to be committed in a
single transaction, and so committed atomically?

thanks!
-- 
Chris Frost
http://www.frostnet.net/chris/
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