I can see how FUA is handled, but REQ_FLUSH seems problematic. My
understanding of REQ_FLUSH semantics: all requests before the flush
request must *complete* before the flush request complete. For IO remap
layer like MD, we need to guarantee all previous requests are
*submitted* to component devices before submitting the flush request. Is
that correct?
If so why I don't see the code which make sure the pending write
requests in stripe cache are processed & submitted before
submit_flushes() get called? Thanks
Eric
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