linux-kernel - [PATCH 4/9] blk-mq: Add blk_mq_tag_resize_sched_shared

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Date:   Wed, 14 Jul 2021 23:06:30 +0800
From:   John Garry <john.garry@...wei.com>
To:     <axboe@...nel.dk>
CC:     <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <ming.lei@...hat.com>, <linux-scsi@...r.kernel.org>,
        <kashyap.desai@...adcom.com>, <hare@...e.de>,
        John Garry <john.garry@...wei.com>
Subject: [PATCH 4/9] blk-mq: Add blk_mq_tag_resize_sched_shared_sbitmap()

Put the functionality to resize the sched shared sbitmap in a common
function.

Since the same formula is always used to resize, and it can be got from
the request queue argument, so just pass the request queue pointer.

Signed-off-by: John Garry <john.garry@...wei.com>
---
 block/blk-mq-sched.c |  3 +--
 block/blk-mq-tag.c   | 10 ++++++++++
 block/blk-mq-tag.h   |  1 +
 block/blk-mq.c       |  3 +--
 4 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index f5cb2931c20d..1e028183557d 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -584,8 +584,7 @@ static int blk_mq_init_sched_shared_sbitmap(struct request_queue *queue)
 					&queue->sched_breserved_tags;
 	}
 
-	sbitmap_queue_resize(&queue->sched_bitmap_tags,
-			     queue->nr_requests - set->reserved_tags);
+	blk_mq_tag_resize_sched_shared_sbitmap(queue);
 
 	return 0;
 }
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index 86f87346232a..55c7f1bf41c7 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -634,6 +634,16 @@ void blk_mq_tag_resize_shared_sbitmap(struct blk_mq_tag_set *set, unsigned int s
 	sbitmap_queue_resize(&set->__bitmap_tags, size - set->reserved_tags);
 }
 
+/*
+ * We always resize with q->nr_requests - q->tag_set->reserved_tags, so
+ * don't bother passing a size.
+ */
+void blk_mq_tag_resize_sched_shared_sbitmap(struct request_queue *q)
+{
+	sbitmap_queue_resize(&q->sched_bitmap_tags,
+			     q->nr_requests - q->tag_set->reserved_tags);
+}
+
 /**
  * blk_mq_unique_tag() - return a tag that is unique queue-wide
  * @rq: request for which to compute a unique tag
diff --git a/block/blk-mq-tag.h b/block/blk-mq-tag.h
index 8ed55af08427..3a7495e47fb4 100644
--- a/block/blk-mq-tag.h
+++ b/block/blk-mq-tag.h
@@ -48,6 +48,7 @@ extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
 					unsigned int depth, bool can_grow);
 extern void blk_mq_tag_resize_shared_sbitmap(struct blk_mq_tag_set *set,
 					     unsigned int size);
+extern void blk_mq_tag_resize_sched_shared_sbitmap(struct request_queue *q);
 
 extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
 void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 56e3c6fdba60..b0d4197d36c7 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -3643,8 +3643,7 @@ int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr)
 		q->nr_requests = nr;
 		if (blk_mq_is_sbitmap_shared(set->flags)) {
 			if (q->elevator) {
-				sbitmap_queue_resize(&q->sched_bitmap_tags,
-						     nr - set->reserved_tags);
+				blk_mq_tag_resize_sched_shared_sbitmap(q);
 			} else {
 				blk_mq_tag_resize_shared_sbitmap(set, nr);
 			}
-- 
2.26.2