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SubjectCan I/O order be guaranteed by submitting sycn bio
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Hi,

Some journal file systems submits sycn bio to do ordered write if the
device does not support barrier i/o. But the sync bio only implies the
unplug of the request queue. Some elevators may reorder the request.
It's seems that the bio only with BIO_RW_SYNC flag could not guarantee
the write order. Is this true?

If so, is there any better way to do ordered write when there is no
barrier i/o support.

Thanks,

--
Xie Gang


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