If you fsync() your data, you are guaranteed that also your data are safely on disk when fsync returns. So what is the question here?
Pardon a newbie's intrusion, but I do know this isn't true. There is a window of possible loss because of the multitude of layers of caching, especially within the drive itself. Unless there is a super_duper_fsync() that is able to actually poll the hardware and get a confirmation that the internal buffers are purged?
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