[PATCH 6.1 51/71] elevator: add new field flags in struct elevator_queue

Sasha Levin
2024-03-13T16:40:59Z

From: Yu Kuai <yukuai3@huawei.com>

[ Upstream commit 181d06637451b5348d746039478e71fa53dfbff6 ]

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@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20221019121518.3865235-6-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Stable-dep-of: f814bdda774c ("blk-wbt: Fix detection of dirty-throttled tasks")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 20e70fd3f77f9..9e12706e8d8cb 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;
}
@@ -523,11 +523,9 @@ 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)) {
kobject_uevent(&e->kobj, KOBJ_REMOVE);
kobject_del(&e->kobj);
-
- e->registered = 0;
}
}

diff --git a/block/elevator.h b/block/elevator.h
index 3f0593b3bf9d3..ed574bf3e629e 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
*/
--
2.43.0