[patch v3 0/3] block: optimize flush for non-queueable flush drive

[shaohua . li]

Flush request isn't queueable. When it's running, other request
can't. We can optimize flush performance according to this knowledge
In my test, I got about 20% performance boost.

v2->v3: mainly adds more comments to explain the optimization and changes
the code position to enable the optimization in SATA.
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