block: Add the QUEUE_FLAG_PREEMPT_ONLY request queue flag

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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 <bart.vanassche@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Martin Steigerwald <martin@lichtvoll.de>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Bart Van Assche 2017-11-09 10:49:57 -08:00 • committed by Jens Axboe

parent 039c635f4e

commit c9254f2ddb

3 changed files with 37 additions and 0 deletions

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include/linux/blkdev.h

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