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blk-mq: don't insert passthrough request into sw queue 

In case of real io scheduler, q->elevator is set, so blk_mq_run_hw_queue()
may just check if scheduler queue has request to dispatch, see
__blk_mq_sched_dispatch_requests(). Then IO hang may be caused because
all passthorugh requests may stay in sw queue.

And any passthrough request should have been inserted to hctx->dispatch
always.

Reported-by: Guangwu Zhang <guazhang@redhat.com>
Fixes: d97217e7f0 ("blk-mq: don't queue plugged passthrough requests into scheduler")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20230621132208.1142318-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2023-06-21 21:22:08 +08:00 committed by Jens Axboe
parent 72ef02b8df
commit 2293cae703
1 changed files with 6 additions and 1 deletions
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7
block/blk-mq.c
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@ -2728,7 +2728,12 @@ static void blk_mq_dispatch_plug_list(struct blk_plug *plug, bool from_sched)
percpu_ref_get(&this_hctx->queue->q_usage_counter);
/* passthrough requests should never be issued to the I/O scheduler */
if (this_hctx->queue->elevator && !is_passthrough) {
if (is_passthrough) {
spin_lock(&this_hctx->lock);
list_splice_tail_init(&list, &this_hctx->dispatch);
spin_unlock(&this_hctx->lock);
blk_mq_run_hw_queue(this_hctx, from_sched);
} else if (this_hctx->queue->elevator) {
this_hctx->queue->elevator->type->ops.insert_requests(this_hctx,
&list, 0);
blk_mq_run_hw_queue(this_hctx, from_sched);