blk-mq: Stop using pointers for blk_mq_tags bitmap tags

Now that we use shared tags for shared sbitmap support, we don't require
the tags sbitmap pointers, so drop them.

This essentially reverts commit 222a5ae03cdd ("blk-mq: Use pointers for
blk_mq_tags bitmap tags").

Function blk_mq_init_bitmap_tags() is removed also, since it would be only
a wrappper for blk_mq_init_bitmaps().

Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1633429419-228500-14-git-send-email-john.garry@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 20 insertions, 36 deletions

diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index 0e10e8404bf0..211068a5f676 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -44,9 +44,9 @@ bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
  */
 void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool include_reserve)
 {
-	sbitmap_queue_wake_all(tags->bitmap_tags);
+	sbitmap_queue_wake_all(&tags->bitmap_tags);
 	if (include_reserve)
-		sbitmap_queue_wake_all(tags->breserved_tags);
+		sbitmap_queue_wake_all(&tags->breserved_tags);
 }
 
 /*
@@ -100,10 +100,10 @@ unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data)
 			WARN_ON_ONCE(1);
 			return BLK_MQ_NO_TAG;
 		}
-		bt = tags->breserved_tags;
+		bt = &tags->breserved_tags;
 		tag_offset = 0;
 	} else {
-		bt = tags->bitmap_tags;
+		bt = &tags->bitmap_tags;
 		tag_offset = tags->nr_reserved_tags;
 	}
 
@@ -149,9 +149,9 @@ unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data)
 						data->ctx);
 		tags = blk_mq_tags_from_data(data);
 		if (data->flags & BLK_MQ_REQ_RESERVED)
-			bt = tags->breserved_tags;
+			bt = &tags->breserved_tags;
 		else
-			bt = tags->bitmap_tags;
+			bt = &tags->bitmap_tags;
 
 		/*
 		 * If destination hw queue is changed, fake wake up on
@@ -185,10 +185,10 @@ void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx,
 		const int real_tag = tag - tags->nr_reserved_tags;
 
 		BUG_ON(real_tag >= tags->nr_tags);
-		sbitmap_queue_clear(tags->bitmap_tags, real_tag, ctx->cpu);
+		sbitmap_queue_clear(&tags->bitmap_tags, real_tag, ctx->cpu);
 	} else {
 		BUG_ON(tag >= tags->nr_reserved_tags);
-		sbitmap_queue_clear(tags->breserved_tags, tag, ctx->cpu);
+		sbitmap_queue_clear(&tags->breserved_tags, tag, ctx->cpu);
 	}
 }
 
@@ -339,9 +339,9 @@ static void __blk_mq_all_tag_iter(struct blk_mq_tags *tags,
 	WARN_ON_ONCE(flags & BT_TAG_ITER_RESERVED);
 
 	if (tags->nr_reserved_tags)
-		bt_tags_for_each(tags, tags->breserved_tags, fn, priv,
+		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);
+	bt_tags_for_each(tags, &tags->bitmap_tags, fn, priv, flags);
 }
 
 /**
@@ -458,8 +458,8 @@ void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
 			continue;
 
 		if (tags->nr_reserved_tags)
-			bt_for_each(hctx, tags->breserved_tags, fn, priv, true);
-		bt_for_each(hctx, tags->bitmap_tags, fn, priv, false);
+			bt_for_each(hctx, &tags->breserved_tags, fn, priv, true);
+		bt_for_each(hctx, &tags->bitmap_tags, fn, priv, false);
 	}
 	blk_queue_exit(q);
 }
@@ -491,24 +491,6 @@ free_bitmap_tags:
 	return -ENOMEM;
 }
 
-static int blk_mq_init_bitmap_tags(struct blk_mq_tags *tags,
-				   int node, int alloc_policy)
-{
-	int ret;
-
-	ret = blk_mq_init_bitmaps(&tags->__bitmap_tags,
-				  &tags->__breserved_tags,
-				  tags->nr_tags, tags->nr_reserved_tags,
-				  node, alloc_policy);
-	if (ret)
-		return ret;
-
-	tags->bitmap_tags = &tags->__bitmap_tags;
-	tags->breserved_tags = &tags->__breserved_tags;
-
-	return 0;
-}
-
 struct blk_mq_tags *blk_mq_init_tags(unsigned int total_tags,
 				     unsigned int reserved_tags,
 				     int node, int alloc_policy)
@@ -528,7 +510,9 @@ struct blk_mq_tags *blk_mq_init_tags(unsigned int total_tags,
 	tags->nr_reserved_tags = reserved_tags;
 	spin_lock_init(&tags->lock);
 
-	if (blk_mq_init_bitmap_tags(tags, node, alloc_policy) < 0) {
+	if (blk_mq_init_bitmaps(&tags->bitmap_tags, &tags->breserved_tags,
+				total_tags, reserved_tags, node,
+				alloc_policy) < 0) {
 		kfree(tags);
 		return NULL;
 	}
@@ -537,8 +521,8 @@ struct blk_mq_tags *blk_mq_init_tags(unsigned int total_tags,
 
 void blk_mq_free_tags(struct blk_mq_tags *tags)
 {
-	sbitmap_queue_free(tags->bitmap_tags);
-	sbitmap_queue_free(tags->breserved_tags);
+	sbitmap_queue_free(&tags->bitmap_tags);
+	sbitmap_queue_free(&tags->breserved_tags);
 	kfree(tags);
 }
 
@@ -587,7 +571,7 @@ int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
 		 * Don't need (or can't) update reserved tags here, they
 		 * remain static and should never need resizing.
 		 */
-		sbitmap_queue_resize(tags->bitmap_tags,
+		sbitmap_queue_resize(&tags->bitmap_tags,
 				tdepth - tags->nr_reserved_tags);
 	}
 
@@ -598,12 +582,12 @@ void blk_mq_tag_resize_shared_sbitmap(struct blk_mq_tag_set *set, unsigned int s
 {
 	struct blk_mq_tags *tags = set->shared_sbitmap_tags;
 
-	sbitmap_queue_resize(&tags->__bitmap_tags, size - set->reserved_tags);
+	sbitmap_queue_resize(&tags->bitmap_tags, size - set->reserved_tags);
 }
 
 void blk_mq_tag_update_sched_shared_sbitmap(struct request_queue *q)
 {
-	sbitmap_queue_resize(q->shared_sbitmap_tags->bitmap_tags,
+	sbitmap_queue_resize(&q->shared_sbitmap_tags->bitmap_tags,
 			     q->nr_requests - q->tag_set->reserved_tags);
 }