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blk-mq: add BLK_MQ_F_DEFER_ISSUE support flag
authorJens Axboe <axboe@fb.com>
Wed, 29 Oct 2014 17:18:26 +0000 (11:18 -0600)
committerJens Axboe <axboe@fb.com>
Wed, 29 Oct 2014 17:18:26 +0000 (11:18 -0600)
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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