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block: blk-mq: support draining mq queue

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blk_mq_drain_queue() is introduced so that we can drain
mq queue inside blk_cleanup_queue().

Also don't accept new requests any more if queue is marked
as dying.

Cc: Jens Axboe <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Ming Lei 2013-12-26 21:31:35 +08:00 • committed by Jens Axboe
commit 43a5e4e219
4 changed files with 40 additions and 18 deletions
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4
block/blk-exec.c
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@ -60,6 +60,10 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
rq->rq_disk = bd_disk;
rq->end_io = done;
/*
* don't check dying flag for MQ because the request won't
* be resued after dying flag is set
*/
if (q->mq_ops) {
blk_mq_insert_request(q, rq, true);
return;