blk-mq: don't dispatch request in blk_mq_request_direct_issue if queue is busy

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If we run into blk_mq_request_direct_issue(), when queue is busy, we
don't want to dispatch this request into hctx->dispatch_list, and
what we need to do is to return the queue busy info to caller, so
that caller can deal with it well.

Fixes: 396eaf21ee ("blk-mq: improve DM's blk-mq IO merging via blk_insert_cloned_request feedback")
Reported-by: Laurence Oberman <loberman@redhat.com>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Ming Lei 2018-01-18 12:06:59 +08:00 • committed by Jens Axboe

parent de99a34688

commit 23d4ee19e7

1 changed files with 10 additions and 12 deletions

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block/blk-mq.c

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