linux-kernel - [PATCH v3 2/5] elevator: add new field flags in struct elevator

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Date:   Thu, 22 Sep 2022 19:35:55 +0800
From:   Yu Kuai <yukuai3@...wei.com>
To:     <jack@...e.cz>, <paolo.valente@...aro.org>, <axboe@...nel.dk>
CC:     <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <yukuai3@...wei.com>, <yukuai1@...weicloud.com>,
        <yi.zhang@...wei.com>
Subject: [PATCH v3 2/5] elevator: add new field flags in struct elevator_queue

There are only one flag to indicate that elevator is registered currently,
prepare to add a flag to disable wbt if default elevator is bfq.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 block/elevator.c | 6 ++----
 block/elevator.h | 4 +++-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/block/elevator.c b/block/elevator.c
index c319765892bb..7cb61820cfa0 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -512,7 +512,7 @@ int elv_register_queue(struct request_queue *q, bool uevent)
 		if (uevent)
 			kobject_uevent(&e->kobj, KOBJ_ADD);
 
-		e->registered = 1;
+		set_bit(ELEVATOR_FLAG_REGISTERED, &e->flags);
 	}
 	return error;
 }
@@ -523,13 +523,11 @@ void elv_unregister_queue(struct request_queue *q)
 
 	lockdep_assert_held(&q->sysfs_lock);
 
-	if (e && e->registered) {
+	if (e && test_and_clear_bit(ELEVATOR_FLAG_REGISTERED, &e->flags)) {
 		struct elevator_queue *e = q->elevator;
 
 		kobject_uevent(&e->kobj, KOBJ_REMOVE);
 		kobject_del(&e->kobj);
-
-		e->registered = 0;
 	}
 }
 
diff --git a/block/elevator.h b/block/elevator.h
index 3f0593b3bf9d..ed574bf3e629 100644
--- a/block/elevator.h
+++ b/block/elevator.h
@@ -100,10 +100,12 @@ struct elevator_queue
 	void *elevator_data;
 	struct kobject kobj;
 	struct mutex sysfs_lock;
-	unsigned int registered:1;
+	unsigned long flags;
 	DECLARE_HASHTABLE(hash, ELV_HASH_BITS);
 };
 
+#define ELEVATOR_FLAG_REGISTERED 0
+
 /*
  * block elevator interface
  */
-- 
2.31.1