If hctx becomes dead, all in-queue IO requests aimed at this hctx have to
be re-submitted, so cover requests queued in scheduler queue.
Cc: John Garry <john.garry@xxxxxxxxxx>
Cc: Bart Van Assche <bvanassche@xxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Keith Busch <keith.busch@xxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
---
block/blk-mq.c | 30 +++++++++++++++++++++++++-----
1 file changed, 25 insertions(+), 5 deletions(-)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 17f0a9ef32a8..06081966549f 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2305,6 +2305,7 @@ static int blk_mq_hctx_notify_dead(unsigned int cpu, struct hlist_node *node)
enum hctx_type type;
bool hctx_dead;
struct request *rq;
+ struct elevator_queue *e;
hctx = hlist_entry_safe(node, struct blk_mq_hw_ctx, cpuhp_dead);
ctx = __blk_mq_get_ctx(hctx->queue, cpu);
@@ -2315,12 +2316,31 @@ static int blk_mq_hctx_notify_dead(unsigned int cpu, struct hlist_node *node)
hctx_dead = cpumask_first_and(hctx->cpumask, cpu_online_mask) >=
nr_cpu_ids;
- spin_lock(&ctx->lock);
- if (!list_empty(&ctx->rq_lists[type])) {
- list_splice_init(&ctx->rq_lists[type], &tmp);
- blk_mq_hctx_clear_pending(hctx, ctx);
+ e = hctx->queue->elevator;
+ if (!e) {
+ spin_lock(&ctx->lock);
+ if (!list_empty(&ctx->rq_lists[type])) {
+ list_splice_init(&ctx->rq_lists[type], &tmp);
+ blk_mq_hctx_clear_pending(hctx, ctx);
+ }
+ spin_unlock(&ctx->lock);
+ } else if (hctx_dead) {
+ LIST_HEAD(sched_tmp);
+
+ while ((rq = e->type->ops.dispatch_request(hctx))) {
+ if (rq->mq_hctx != hctx)
+ list_add(&rq->queuelist, &sched_tmp);
+ else
+ list_add(&rq->queuelist, &tmp);
+ }
+
+ while (!list_empty(&sched_tmp)) {
+ rq = list_entry(sched_tmp.next, struct request,
+ queuelist);
+ list_del_init(&rq->queuelist);
+ blk_mq_sched_insert_request(rq, true, true, true);
+ }
}
- spin_unlock(&ctx->lock);
if (!hctx_dead) {
if (list_empty(&tmp))
--
2.20.1
