blk-mq: don't wait in blk_mq_queue_enter() if __GFP_WAIT isn't set
Return -EBUSY if we're unable to enter a queue immediately when allocating a blk-mq request without __GFP_WAIT. Signed-off-by:Keith Busch <keith.busch@intel.com> Signed-off-by:
Mike Snitzer <snitzer@redhat.com> Signed-off-by:
Jens Axboe <axboe@fb.com>
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b94ec296