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blk-mq: defer to the normal submission path for post-flush requests 

Requests with the FUA bit on hardware without FUA support need a post
flush before returning to the caller, but they can still be sent using
the normal I/O path after initializing the flush-related fields and
end I/O handler.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20230519044050.107790-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2023-05-19 06:40:48 +02:00 committed by Jens Axboe
parent be4c427809
commit 615939a2ae
1 changed files with 11 additions and 0 deletions
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11
block/blk-flush.c
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@ -432,6 +432,17 @@ bool blk_insert_flush(struct request *rq)
* Queue for normal execution.
*/
return false;
case REQ_FSEQ_DATA | REQ_FSEQ_POSTFLUSH:
/*
* Initialize the flush fields and completion handler to trigger
* the post flush, and then just pass the command on.
*/
blk_rq_init_flush(rq);
rq->flush.seq |= REQ_FSEQ_POSTFLUSH;
spin_lock_irq(&fq->mq_flush_lock);
list_move_tail(&rq->flush.list, &fq->flush_data_in_flight);
spin_unlock_irq(&fq->mq_flush_lock);
return false;
default:
/*
* Mark the request as part of a flush sequence and submit it