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Date: Thu, 24 Feb 2022 17:06:44 +0800
From: "Wang Jianchao (Kuaishou)" <jianchao.wan9@...il.com>
To: Jens Axboe <axboe@...nel.dk>
Cc: Josef Bacik <jbacik@...com>, Tejun Heo <tj@...nel.org>,
Bart Van Assche <bvanassche@....org>,
linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC V5 06/16] blk-ioprio: make ioprio pluggable
Use new blk-rq-qos API to make blk-ioprio pluggable.
Signed-off-by: Wang Jianchao (Kuaishou) <jianchao.wan9@...il.com>
---
block/blk-cgroup.c | 5 ----
block/blk-ioprio.c | 53 ++++++++++++++++++++++++------------------
block/blk-ioprio.h | 19 ---------------
block/blk-mq-debugfs.c | 4 ----
block/blk-rq-qos.c | 2 +-
block/blk-rq-qos.h | 2 +-
6 files changed, 33 insertions(+), 52 deletions(-)
delete mode 100644 block/blk-ioprio.h
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 3ae2aa557aef..f617f7ba311d 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -32,7 +32,6 @@
#include <linux/psi.h>
#include <linux/part_stat.h>
#include "blk.h"
-#include "blk-ioprio.h"
#include "blk-throttle.h"
/*
@@ -1195,10 +1194,6 @@ int blkcg_init_queue(struct request_queue *q)
if (preloaded)
radix_tree_preload_end();
- ret = blk_ioprio_init(q);
- if (ret)
- goto err_destroy_all;
-
ret = blk_throtl_init(q);
if (ret)
goto err_destroy_all;
diff --git a/block/blk-ioprio.c b/block/blk-ioprio.c
index 2e7f10e1c03f..947aae54d295 100644
--- a/block/blk-ioprio.c
+++ b/block/blk-ioprio.c
@@ -17,7 +17,6 @@
#include <linux/blk_types.h>
#include <linux/kernel.h>
#include <linux/module.h>
-#include "blk-ioprio.h"
#include "blk-rq-qos.h"
/**
@@ -45,6 +44,7 @@ static const char *policy_name[] = {
};
static struct blkcg_policy ioprio_policy;
+static struct rq_qos_ops blkcg_ioprio_ops;
/**
* struct ioprio_blkg - Per (cgroup, request queue) data.
@@ -216,15 +216,11 @@ static void blkcg_ioprio_exit(struct rq_qos *rqos)
container_of(rqos, typeof(*blkioprio_blkg), rqos);
blkcg_deactivate_policy(rqos->q, &ioprio_policy);
+ rq_qos_deactivate(rqos);
kfree(blkioprio_blkg);
}
-static struct rq_qos_ops blkcg_ioprio_ops = {
- .track = blkcg_ioprio_track,
- .exit = blkcg_ioprio_exit,
-};
-
-int blk_ioprio_init(struct request_queue *q)
+static int blk_ioprio_init(struct request_queue *q)
{
struct blk_ioprio *blkioprio_blkg;
struct rq_qos *rqos;
@@ -234,35 +230,48 @@ int blk_ioprio_init(struct request_queue *q)
if (!blkioprio_blkg)
return -ENOMEM;
+ /*
+ * No need to worry ioprio_blkcg_from_css return NULL as
+ * the queue is frozen right now.
+ */
+ rqos = &blkioprio_blkg->rqos;
+ rq_qos_activate(q, rqos, &blkcg_ioprio_ops);
+
ret = blkcg_activate_policy(q, &ioprio_policy);
if (ret) {
+ rq_qos_deactivate(rqos);
kfree(blkioprio_blkg);
- return ret;
}
- rqos = &blkioprio_blkg->rqos;
- rqos->id = RQ_QOS_IOPRIO;
- rqos->ops = &blkcg_ioprio_ops;
- rqos->q = q;
-
- /*
- * Registering the rq-qos policy after activating the blk-cgroup
- * policy guarantees that ioprio_blkcg_from_bio(bio) != NULL in the
- * rq-qos callbacks.
- */
- rq_qos_add(q, rqos);
-
- return 0;
+ return ret;
}
+static struct rq_qos_ops blkcg_ioprio_ops = {
+ .name = "ioprio",
+ .track = blkcg_ioprio_track,
+ .exit = blkcg_ioprio_exit,
+ .init = blk_ioprio_init,
+};
+
static int __init ioprio_init(void)
{
- return blkcg_policy_register(&ioprio_policy);
+ int ret;
+
+ ret = rq_qos_register(&blkcg_ioprio_ops);
+ if (ret)
+ return ret;
+
+ ret = blkcg_policy_register(&ioprio_policy);
+ if (ret)
+ rq_qos_unregister(&blkcg_ioprio_ops);
+
+ return ret;
}
static void __exit ioprio_exit(void)
{
blkcg_policy_unregister(&ioprio_policy);
+ rq_qos_unregister(&blkcg_ioprio_ops);
}
module_init(ioprio_init);
diff --git a/block/blk-ioprio.h b/block/blk-ioprio.h
deleted file mode 100644
index a7785c2f1aea..000000000000
--- a/block/blk-ioprio.h
+++ /dev/null
@@ -1,19 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-
-#ifndef _BLK_IOPRIO_H_
-#define _BLK_IOPRIO_H_
-
-#include <linux/kconfig.h>
-
-struct request_queue;
-
-#ifdef CONFIG_BLK_CGROUP_IOPRIO
-int blk_ioprio_init(struct request_queue *q);
-#else
-static inline int blk_ioprio_init(struct request_queue *q)
-{
- return 0;
-}
-#endif
-
-#endif /* _BLK_IOPRIO_H_ */
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 27ca6185ad59..a35f2d6dd422 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -825,10 +825,6 @@ void blk_mq_debugfs_unregister_sched(struct request_queue *q)
static const char *rq_qos_id_to_name(enum rq_qos_id id)
{
- switch (id) {
- case RQ_QOS_IOPRIO:
- return "ioprio";
- }
return "unknown";
}
diff --git a/block/blk-rq-qos.c b/block/blk-rq-qos.c
index c43436c2ead1..03f2e654cd17 100644
--- a/block/blk-rq-qos.c
+++ b/block/blk-rq-qos.c
@@ -433,7 +433,7 @@ int rq_qos_register(struct rq_qos_ops *ops)
goto out;
}
- start = RQ_QOS_IOPRIO + 1;
+ start = 1;
ret = idr_alloc(&rq_qos_idr, ops, start, INT_MAX, GFP_KERNEL);
if (ret < 0)
goto out;
diff --git a/block/blk-rq-qos.h b/block/blk-rq-qos.h
index ab95a366710d..5a26eb128456 100644
--- a/block/blk-rq-qos.h
+++ b/block/blk-rq-qos.h
@@ -14,7 +14,7 @@
struct blk_mq_debugfs_attr;
enum rq_qos_id {
- RQ_QOS_IOPRIO,
+ RQ_QOS_UNUSED,
};
struct rq_wait {
--
2.17.1
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