blk-mq: add BLK_MQ_F_DEFER_ISSUE support flag

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Drivers can now tell blk-mq if they take advantage of the deferred
issue through 'last' or not. If they do, don't do queue-direct
for sync IO. This is a preparation patch for the nvme conversion.

Signed-off-by: Jens Axboe <axboe@fb.com>

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Jens Axboe 2014-10-29 11:18:26 -06:00

parent 74c450521d

commit e167dfb53c

2 changed files with 7 additions and 1 deletions

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include/linux/blk-mq.h

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