block: add a op_is_flush helper
This centralizes the checks for bios that needs to be go into the flush state machine. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com> Reviewed-by: NBart Van Assche <bart.vanassche@sandisk.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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