linux-kernel - [PATCH v2 2/3] blk-ioprio: remove ioprio_blkcg_from

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Message-Id: <20240719023431.3800647-3-yukuai1@huaweicloud.com>
Date: Fri, 19 Jul 2024 10:34:30 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: bvanassche@....org,
	jack@...e.cz,
	hch@...radead.org,
	tj@...nel.org,
	josef@...icpanda.com,
	axboe@...nel.dk
Cc: cgroups@...r.kernel.org,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	yukuai3@...wei.com,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH v2 2/3] blk-ioprio: remove ioprio_blkcg_from_bio()

From: Yu Kuai <yukuai3@...wei.com>

Currently, if config is enabled, then ioprio is always enabled by
default from blkcg_init_disk(), hence there is no point to check if
the policy is enabled from blkg in ioprio_blkcg_from_bio(). Hence remove
it and get blkcg directly from bio.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 block/blk-ioprio.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/block/blk-ioprio.c b/block/blk-ioprio.c
index 4051fada01f1..ae52b418e984 100644
--- a/block/blk-ioprio.c
+++ b/block/blk-ioprio.c
@@ -84,16 +84,6 @@ ioprio_blkcg_from_css(struct cgroup_subsys_state *css)
 	return blkcg_to_ioprio_blkcg(css_to_blkcg(css));
 }
 
-static struct ioprio_blkcg *ioprio_blkcg_from_bio(struct bio *bio)
-{
-	struct blkg_policy_data *pd = blkg_to_pd(bio->bi_blkg, &ioprio_policy);
-
-	if (!pd)
-		return NULL;
-
-	return blkcg_to_ioprio_blkcg(pd->blkg->blkcg);
-}
-
 static int ioprio_show_prio_policy(struct seq_file *sf, void *v)
 {
 	struct ioprio_blkcg *blkcg = ioprio_blkcg_from_css(seq_css(sf));
@@ -186,7 +176,7 @@ static struct blkcg_policy ioprio_policy = {
 
 void blkcg_set_ioprio(struct bio *bio)
 {
-	struct ioprio_blkcg *blkcg = ioprio_blkcg_from_bio(bio);
+	struct ioprio_blkcg *blkcg = blkcg_to_ioprio_blkcg(bio->bi_blkg->blkcg);
 	u16 prio;
 
 	if (!blkcg || blkcg->prio_policy == POLICY_NO_CHANGE)
-- 
2.39.2