On Wed, Dec 28, 2011 at 11:14:19AM -0800, m...@freebsd.org wrote: > SU doesn't care about write ordering, as long as everything before a > BIO_FLUSH is really flushed by the time the BIO_FLUSH is acknowledged. No.
SU and SU+J only require that write completed notification is issued when geom/driver layer guarantees that the block content is written to the stable storage. SU does not depend on non-reordering of writes in any way, as well as it does not issue BIO_FLUSH.
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