1 files changed, 39 insertions, 49 deletions

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 4e76651e786d..e1bca29dc358 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -506,7 +506,7 @@ __blk_mq_alloc_requests_batch(struct blk_mq_alloc_data *data)
 		prefetch(tags->static_rqs[tag]);
 		tag_mask &= ~(1UL << i);
 		rq = blk_mq_rq_ctx_init(data, tags, tag);
-		rq_list_add(data->cached_rq, rq);
+		rq_list_add_head(data->cached_rqs, rq);
 		nr++;
 	}
 	if (!(data->rq_flags & RQF_SCHED_TAGS))
@@ -515,7 +515,7 @@ __blk_mq_alloc_requests_batch(struct blk_mq_alloc_data *data)
 	percpu_ref_get_many(&data->q->q_usage_counter, nr - 1);
 	data->nr_tags -= nr;
 
-	return rq_list_pop(data->cached_rq);
+	return rq_list_pop(data->cached_rqs);
 }
 
 static struct request *__blk_mq_alloc_requests(struct blk_mq_alloc_data *data)
@@ -612,7 +612,7 @@ static struct request *blk_mq_rq_cache_fill(struct request_queue *q,
 		.flags		= flags,
 		.cmd_flags	= opf,
 		.nr_tags	= plug->nr_ios,
-		.cached_rq	= &plug->cached_rq,
+		.cached_rqs	= &plug->cached_rqs,
 	};
 	struct request *rq;
 
@@ -637,14 +637,14 @@ static struct request *blk_mq_alloc_cached_request(struct request_queue *q,
 	if (!plug)
 		return NULL;
 
-	if (rq_list_empty(plug->cached_rq)) {
+	if (rq_list_empty(&plug->cached_rqs)) {
 		if (plug->nr_ios == 1)
 			return NULL;
 		rq = blk_mq_rq_cache_fill(q, plug, opf, flags);
 		if (!rq)
 			return NULL;
 	} else {
-		rq = rq_list_peek(&plug->cached_rq);
+		rq = rq_list_peek(&plug->cached_rqs);
 		if (!rq || rq->q != q)
 			return NULL;
 
@@ -653,7 +653,7 @@ static struct request *blk_mq_alloc_cached_request(struct request_queue *q,
 		if (op_is_flush(rq->cmd_flags) != op_is_flush(opf))
 			return NULL;
 
-		plug->cached_rq = rq_list_next(rq);
+		rq_list_pop(&plug->cached_rqs);
 		blk_mq_rq_time_init(rq, 0);
 	}
 
@@ -830,7 +830,7 @@ void blk_mq_free_plug_rqs(struct blk_plug *plug)
 {
 	struct request *rq;
 
-	while ((rq = rq_list_pop(&plug->cached_rq)) != NULL)
+	while ((rq = rq_list_pop(&plug->cached_rqs)) != NULL)
 		blk_mq_free_request(rq);
 }
 
@@ -870,7 +870,7 @@ static void blk_print_req_error(struct request *req, blk_status_t status)
 		blk_op_str(req_op(req)),
 		(__force u32)(req->cmd_flags & ~REQ_OP_MASK),
 		req->nr_phys_segments,
-		IOPRIO_PRIO_CLASS(req->ioprio));
+		IOPRIO_PRIO_CLASS(req_get_ioprio(req)));
 }
 
 /*
@@ -1386,8 +1386,7 @@ static void blk_add_rq_to_plug(struct blk_plug *plug, struct request *rq)
 	 */
 	if (!plug->has_elevator && (rq->rq_flags & RQF_SCHED_TAGS))
 		plug->has_elevator = true;
-	rq->rq_next = NULL;
-	rq_list_add(&plug->mq_list, rq);
+	rq_list_add_tail(&plug->mq_list, rq);
 	plug->rq_count++;
 }
 
@@ -2655,7 +2654,6 @@ static void blk_mq_bio_to_request(struct request *rq, struct bio *bio,
 		rq->cmd_flags |= REQ_FAILFAST_MASK;
 
 	rq->__sector = bio->bi_iter.bi_sector;
-	rq->write_hint = bio->bi_write_hint;
 	blk_rq_bio_prep(rq, bio, nr_segs);
 	if (bio_integrity(bio))
 		rq->nr_integrity_segments = blk_rq_count_integrity_sg(rq->q,
@@ -2781,7 +2779,7 @@ static void blk_mq_plug_issue_direct(struct blk_plug *plug)
 	blk_status_t ret = BLK_STS_OK;
 
 	while ((rq = rq_list_pop(&plug->mq_list))) {
-		bool last = rq_list_empty(plug->mq_list);
+		bool last = rq_list_empty(&plug->mq_list);
 
 		if (hctx != rq->mq_hctx) {
 			if (hctx) {
@@ -2824,8 +2822,7 @@ static void blk_mq_dispatch_plug_list(struct blk_plug *plug, bool from_sched)
 {
 	struct blk_mq_hw_ctx *this_hctx = NULL;
 	struct blk_mq_ctx *this_ctx = NULL;
-	struct request *requeue_list = NULL;
-	struct request **requeue_lastp = &requeue_list;
+	struct rq_list requeue_list = {};
 	unsigned int depth = 0;
 	bool is_passthrough = false;
 	LIST_HEAD(list);
@@ -2839,12 +2836,12 @@ static void blk_mq_dispatch_plug_list(struct blk_plug *plug, bool from_sched)
 			is_passthrough = blk_rq_is_passthrough(rq);
 		} else if (this_hctx != rq->mq_hctx || this_ctx != rq->mq_ctx ||
 			   is_passthrough != blk_rq_is_passthrough(rq)) {
-			rq_list_add_tail(&requeue_lastp, rq);
+			rq_list_add_tail(&requeue_list, rq);
 			continue;
 		}
-		list_add(&rq->queuelist, &list);
+		list_add_tail(&rq->queuelist, &list);
 		depth++;
-	} while (!rq_list_empty(plug->mq_list));
+	} while (!rq_list_empty(&plug->mq_list));
 
 	plug->mq_list = requeue_list;
 	trace_block_unplug(this_hctx->queue, depth, !from_sched);
@@ -2899,19 +2896,19 @@ void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule)
 		if (q->mq_ops->queue_rqs) {
 			blk_mq_run_dispatch_ops(q,
 				__blk_mq_flush_plug_list(q, plug));
-			if (rq_list_empty(plug->mq_list))
+			if (rq_list_empty(&plug->mq_list))
 				return;
 		}
 
 		blk_mq_run_dispatch_ops(q,
 				blk_mq_plug_issue_direct(plug));
-		if (rq_list_empty(plug->mq_list))
+		if (rq_list_empty(&plug->mq_list))
 			return;
 	}
 
 	do {
 		blk_mq_dispatch_plug_list(plug, from_schedule);
-	} while (!rq_list_empty(plug->mq_list));
+	} while (!rq_list_empty(&plug->mq_list));
 }
 
 static void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
@@ -2976,7 +2973,7 @@ static struct request *blk_mq_get_new_requests(struct request_queue *q,
 	if (plug) {
 		data.nr_tags = plug->nr_ios;
 		plug->nr_ios = 1;
-		data.cached_rq = &plug->cached_rq;
+		data.cached_rqs = &plug->cached_rqs;
 	}
 
 	rq = __blk_mq_alloc_requests(&data);
@@ -2999,7 +2996,7 @@ static struct request *blk_mq_peek_cached_request(struct blk_plug *plug,
 
 	if (!plug)
 		return NULL;
-	rq = rq_list_peek(&plug->cached_rq);
+	rq = rq_list_peek(&plug->cached_rqs);
 	if (!rq || rq->q != q)
 		return NULL;
 	if (type != rq->mq_hctx->type &&
@@ -3013,14 +3010,14 @@ static struct request *blk_mq_peek_cached_request(struct blk_plug *plug,
 static void blk_mq_use_cached_rq(struct request *rq, struct blk_plug *plug,
 		struct bio *bio)
 {
-	WARN_ON_ONCE(rq_list_peek(&plug->cached_rq) != rq);
+	if (rq_list_pop(&plug->cached_rqs) != rq)
+		WARN_ON_ONCE(1);
 
 	/*
 	 * If any qos ->throttle() end up blocking, we will have flushed the
 	 * plug and hence killed the cached_rq list as well. Pop this entry
 	 * before we throttle.
 	 */
-	plug->cached_rq = rq_list_next(rq);
 	rq_qos_throttle(rq->q, bio);
 
 	blk_mq_rq_time_init(rq, 0);
@@ -3092,14 +3089,21 @@ void blk_mq_submit_bio(struct bio *bio)
 	}
 
 	/*
-	 * Device reconfiguration may change logical block size, so alignment
-	 * check has to be done with queue usage counter held
+	 * Device reconfiguration may change logical block size or reduce the
+	 * number of poll queues, so the checks for alignment and poll support
+	 * have to be done with queue usage counter held.
 	 */
 	if (unlikely(bio_unaligned(bio, q))) {
 		bio_io_error(bio);
 		goto queue_exit;
 	}
 
+	if ((bio->bi_opf & REQ_POLLED) && !blk_mq_can_poll(q)) {
+		bio->bi_status = BLK_STS_NOTSUPP;
+		bio_endio(bio);
+		goto queue_exit;
+	}
+
 	bio = __bio_split_to_limits(bio, &q->limits, &nr_segs);
 	if (!bio)
 		goto queue_exit;
@@ -3110,8 +3114,10 @@ void blk_mq_submit_bio(struct bio *bio)
 	if (blk_mq_attempt_bio_merge(q, bio, nr_segs))
 		goto queue_exit;
 
-	if (blk_queue_is_zoned(q) && blk_zone_plug_bio(bio, nr_segs))
-		goto queue_exit;
+	if (bio_needs_zone_write_plugging(bio)) {
+		if (blk_zone_plug_bio(bio, nr_segs))
+			goto queue_exit;
+	}
 
 new_request:
 	if (!rq) {
@@ -3302,8 +3308,7 @@ int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
 		rq->special_vec = rq_src->special_vec;
 	}
 	rq->nr_phys_segments = rq_src->nr_phys_segments;
-	rq->ioprio = rq_src->ioprio;
-	rq->write_hint = rq_src->write_hint;
+	rq->nr_integrity_segments = rq_src->nr_integrity_segments;
 
 	if (rq->bio && blk_crypto_rq_bio_prep(rq, rq->bio, gfp_mask) < 0)
 		goto free_and_out;
@@ -4325,12 +4330,6 @@ void blk_mq_release(struct request_queue *q)
 	blk_mq_sysfs_deinit(q);
 }
 
-static bool blk_mq_can_poll(struct blk_mq_tag_set *set)
-{
-	return set->nr_maps > HCTX_TYPE_POLL &&
-		set->map[HCTX_TYPE_POLL].nr_queues;
-}
-
 struct request_queue *blk_mq_alloc_queue(struct blk_mq_tag_set *set,
 		struct queue_limits *lim, void *queuedata)
 {
@@ -4341,7 +4340,7 @@ struct request_queue *blk_mq_alloc_queue(struct blk_mq_tag_set *set,
 	if (!lim)
 		lim = &default_lim;
 	lim->features |= BLK_FEAT_IO_STAT | BLK_FEAT_NOWAIT;
-	if (blk_mq_can_poll(set))
+	if (set->nr_maps > HCTX_TYPE_POLL)
 		lim->features |= BLK_FEAT_POLL;
 
 	q = blk_alloc_queue(lim, set->numa_node);
@@ -5029,8 +5028,6 @@ static void __blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set,
 fallback:
 	blk_mq_update_queue_map(set);
 	list_for_each_entry(q, &set->tag_list, tag_set_list) {
-		struct queue_limits lim;
-
 		blk_mq_realloc_hw_ctxs(set, q);
 
 		if (q->nr_hw_queues != set->nr_hw_queues) {
@@ -5044,13 +5041,6 @@ fallback:
 			set->nr_hw_queues = prev_nr_hw_queues;
 			goto fallback;
 		}
-		lim = queue_limits_start_update(q);
-		if (blk_mq_can_poll(set))
-			lim.features |= BLK_FEAT_POLL;
-		else
-			lim.features &= ~BLK_FEAT_POLL;
-		if (queue_limits_commit_update(q, &lim) < 0)
-			pr_warn("updating the poll flag failed\n");
 		blk_mq_map_swqueue(q);
 	}
 
@@ -5110,9 +5100,9 @@ static int blk_hctx_poll(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
 int blk_mq_poll(struct request_queue *q, blk_qc_t cookie,
 		struct io_comp_batch *iob, unsigned int flags)
 {
-	struct blk_mq_hw_ctx *hctx = xa_load(&q->hctx_table, cookie);
-
-	return blk_hctx_poll(q, hctx, iob, flags);
+	if (!blk_mq_can_poll(q))
+		return 0;
+	return blk_hctx_poll(q, xa_load(&q->hctx_table, cookie), iob, flags);
 }
 
 int blk_rq_poll(struct request *rq, struct io_comp_batch *iob,