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@xxxxxx> --- block/blk-flush.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/block/blk-flush.c b/block/blk-flush.c index 6fb9cf2d38184b..7121f9ad0762f8 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 -- 2.39.2
