diff options
Diffstat (limited to 'block/mq-deadline.c')
| -rw-r--r-- | block/mq-deadline.c | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/block/mq-deadline.c b/block/mq-deadline.c index 2a2a2e82832e..b490f47fd553 100644 --- a/block/mq-deadline.c +++ b/block/mq-deadline.c @@ -377,13 +377,6 @@ done: * hardware queue, but we may return a request that is for a * different hardware queue. This is because mq-deadline has shared * state for all hardware queues, in terms of sorting, FIFOs, etc. - * - * For a zoned block device, __dd_dispatch_request() may return NULL - * if all the queued write requests are directed at zones that are already - * locked due to on-going write requests. In this case, make sure to mark - * the queue as needing a restart to ensure that the queue is run again - * and the pending writes dispatched once the target zones for the ongoing - * write requests are unlocked in dd_finish_request(). */ static struct request *dd_dispatch_request(struct blk_mq_hw_ctx *hctx) { @@ -392,9 +385,6 @@ static struct request *dd_dispatch_request(struct blk_mq_hw_ctx *hctx) spin_lock(&dd->lock); rq = __dd_dispatch_request(dd); - if (!rq && blk_queue_is_zoned(hctx->queue) && - !list_empty(&dd->fifo_list[WRITE])) - blk_mq_sched_mark_restart_hctx(hctx); spin_unlock(&dd->lock); return rq; @@ -561,6 +551,13 @@ static void dd_prepare_request(struct request *rq, struct bio *bio) * spinlock so that the zone is never unlocked while deadline_fifo_request() * or deadline_next_request() are executing. This function is called for * all requests, whether or not these requests complete successfully. + * + * For a zoned block device, __dd_dispatch_request() may have stopped + * dispatching requests if all the queued requests are write requests directed + * at zones that are already locked due to on-going write requests. To ensure + * write request dispatch progress in this case, mark the queue as needing a + * restart to ensure that the queue is run again after completion of the + * request and zones being unlocked. */ static void dd_finish_request(struct request *rq) { @@ -572,6 +569,8 @@ static void dd_finish_request(struct request *rq) spin_lock_irqsave(&dd->zone_lock, flags); blk_req_zone_write_unlock(rq); + if (!list_empty(&dd->fifo_list[WRITE])) + blk_mq_sched_mark_restart_hctx(rq->mq_hctx); spin_unlock_irqrestore(&dd->zone_lock, flags); } } @@ -795,6 +794,7 @@ static struct elevator_type mq_deadline = { .elevator_attrs = deadline_attrs, .elevator_name = "mq-deadline", .elevator_alias = "deadline", + .elevator_features = ELEVATOR_F_ZBD_SEQ_WRITE, .elevator_owner = THIS_MODULE, }; MODULE_ALIAS("mq-deadline-iosched"); |