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"Christoph" == Christoph Hellwig [off-list ref] writes:
Christoph> We can't initalize the elevator fields for flushes as flush
Christoph> share space in struct request with the elevator data. But
Christoph> currently we can't commnicate that a request is a flush
communicate
Christoph> through blk_get_request as we can only pass READ or WRITE,
Christoph> and the low-level code looks at the possible NULL bio to
Christoph> check for a flush.
Christoph> Fix this by allowing to pass any block op and flags, and by
Christoph> checking for the flush flags in __get_request.
Reviewed-by: Martin K. Petersen <redacted>
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Martin K. Petersen Oracle Linux Engineering