From 615939a2ae734e3e68c816d6749d1f5f79c62ab7 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig <hch@lst.de> Date: Fri, 19 May 2023 06:40:48 +0200 Subject: [PATCH] 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> --- block/blk-flush.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/block/blk-flush.c b/block/blk-flush.c index 6fb9cf2d38184..7121f9ad0762f 100644 --- a/block/blk-flush.c +++ b/block/blk-flush.c @@ -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 -- GitLab