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blk-mq: add helper to insert requests from irq context

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Both the cache flush state machine and the SCSI midlayer want to submit
requests from irq context, and the current per-request requeue_work
unfortunately causes corruption due to sharing with the csd field for
flushes.  Replace them with a per-request_queue list of requests to
be requeued.

Based on an earlier test by Ming Lei.

Signed-off-by: Christoph Hellwig <[email protected]>
Reported-by: Ming Lei <[email protected]>
Tested-by: Ming Lei <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Christoph Hellwig 2014-05-28 08:08:02 -06:00 • committed by Jens Axboe
commit 6fca6a611c
4 changed files with 73 additions and 14 deletions
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16
block/blk-flush.c
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@ -130,21 +130,13 @@ static void blk_flush_restore_request(struct request *rq)
blk_clear_rq_complete(rq);
}
static void mq_flush_run(struct work_struct *work)
{
struct request *rq;
rq = container_of(work, struct request, requeue_work);
memset(&rq->csd, 0, sizeof(rq->csd));
blk_mq_insert_request(rq, false, true, false);
}
static bool blk_flush_queue_rq(struct request *rq, bool add_front)
{
if (rq->q->mq_ops) {
INIT_WORK(&rq->requeue_work, mq_flush_run);
kblockd_schedule_work(&rq->requeue_work);
struct request_queue *q = rq->q;
blk_mq_add_to_requeue_list(rq, add_front);
blk_mq_kick_requeue_list(q);
return false;
} else {
if (add_front)