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block: Add the QUEUE_FLAG_PREEMPT_ONLY request queue flag
This flag will be used in the next patch to let the block layer core know whether or not a SCSI request queue has been quiesced. A quiesced SCSI queue namely only processes RQF_PREEMPT requests. Signed-off-by: Bart Van Assche <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Tested-by: Martin Steigerwald <[email protected]> Tested-by: Oleksandr Natalenko <[email protected]> Cc: Ming Lei <[email protected]> Cc: Christoph Hellwig <[email protected]> Cc: Johannes Thumshirn <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
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