linux-kernel - [PATCH v3 2/6] blk-mq-tag: introduce __blk_mq_tagset_busy

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Date:   Wed, 23 Aug 2023 23:17:59 +0800
From:   chengming.zhou@...ux.dev
To:     axboe@...nel.dk, ming.lei@...hat.com, bvanassche@....org,
        hch@....de
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        zhouchengming@...edance.com
Subject: [PATCH v3 2/6] blk-mq-tag: introduce __blk_mq_tagset_busy_iter()

From: Chengming Zhou <zhouchengming@...edance.com>

For support of specified queue filter when iterating over a tagset,
we introduce __blk_mq_tagset_busy_iter() here and all current users
just set queue as NULL which means have no queue filter.

Reviewed-by: Bart Van Assche <bvanassche@....org>
Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
---
 block/blk-mq-tag.c | 41 ++++++++++++++++++++++++++---------------
 1 file changed, 26 insertions(+), 15 deletions(-)

diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index 3cf3cf72cd54..dc4edde3c80a 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -381,15 +381,18 @@ static bool bt_tags_iter(struct sbitmap *bitmap, unsigned int bitnr, void *data)
  *		to continue iterating tags, false to stop.
  * @data:	Will be passed as second argument to @fn.
  * @flags:	BT_TAG_ITER_*
+ * @q:		Only iterate over requests of this queue.
  */
 static void bt_tags_for_each(struct blk_mq_tags *tags, struct sbitmap_queue *bt,
-			     busy_tag_iter_fn *fn, void *data, unsigned int flags)
+			     busy_tag_iter_fn *fn, void *data, unsigned int flags,
+			     struct request_queue *q)
 {
 	struct bt_tags_iter_data iter_data = {
 		.tags = tags,
 		.fn = fn,
 		.data = data,
 		.flags = flags,
+		.q = q,
 	};
 
 	if (tags->rqs)
@@ -397,14 +400,15 @@ static void bt_tags_for_each(struct blk_mq_tags *tags, struct sbitmap_queue *bt,
 }
 
 static void __blk_mq_all_tag_iter(struct blk_mq_tags *tags,
-		busy_tag_iter_fn *fn, void *priv, unsigned int flags)
+		busy_tag_iter_fn *fn, void *priv, unsigned int flags,
+		struct request_queue *q)
 {
 	WARN_ON_ONCE(flags & BT_TAG_ITER_RESERVED);
 
 	if (tags->nr_reserved_tags)
 		bt_tags_for_each(tags, &tags->breserved_tags, fn, priv,
-				 flags | BT_TAG_ITER_RESERVED);
-	bt_tags_for_each(tags, &tags->bitmap_tags, fn, priv, flags);
+				 flags | BT_TAG_ITER_RESERVED, q);
+	bt_tags_for_each(tags, &tags->bitmap_tags, fn, priv, flags, q);
 }
 
 /**
@@ -422,7 +426,23 @@ static void __blk_mq_all_tag_iter(struct blk_mq_tags *tags,
 void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
 		void *priv)
 {
-	__blk_mq_all_tag_iter(tags, fn, priv, BT_TAG_ITER_STATIC_RQS);
+	__blk_mq_all_tag_iter(tags, fn, priv, BT_TAG_ITER_STATIC_RQS, NULL);
+}
+
+static void __blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
+				      busy_tag_iter_fn *fn, void *priv,
+				      struct request_queue *q)
+{
+	unsigned int flags = tagset->flags;
+	int i, nr_tags;
+
+	nr_tags = blk_mq_is_shared_tags(flags) ? 1 : tagset->nr_hw_queues;
+
+	for (i = 0; i < nr_tags; i++) {
+		if (tagset->tags && tagset->tags[i])
+			__blk_mq_all_tag_iter(tagset->tags[i], fn, priv,
+					      BT_TAG_ITER_STARTED, q);
+	}
 }
 
 /**
@@ -441,16 +461,7 @@ void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
 void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
 		busy_tag_iter_fn *fn, void *priv)
 {
-	unsigned int flags = tagset->flags;
-	int i, nr_tags;
-
-	nr_tags = blk_mq_is_shared_tags(flags) ? 1 : tagset->nr_hw_queues;
-
-	for (i = 0; i < nr_tags; i++) {
-		if (tagset->tags && tagset->tags[i])
-			__blk_mq_all_tag_iter(tagset->tags[i], fn, priv,
-					      BT_TAG_ITER_STARTED);
-	}
+	__blk_mq_tagset_busy_iter(tagset, fn, priv, NULL);
 }
 EXPORT_SYMBOL(blk_mq_tagset_busy_iter);
 
-- 
2.41.0