linux-kernel - [PATCH v4 3/6] blk-wbt: make enable

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Date:   Fri, 30 Sep 2022 11:19:03 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     jack@...e.cz, hch@...radead.org, ebiggers@...nel.org,
        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 v4 3/6] blk-wbt: make enable_state more accurate

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

Currently, if user disable wbt through sysfs, 'enable_state' will be
'WBT_STATE_ON_MANUAL', which will be confusing. Add a new state
'WBT_STATE_OFF_MANUAL' to cover that case.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 block/blk-wbt.c |  7 ++++++-
 block/blk-wbt.h | 12 +++++++-----
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/block/blk-wbt.c b/block/blk-wbt.c
index 4ed60dbd0756..9cac54569ff1 100644
--- a/block/blk-wbt.c
+++ b/block/blk-wbt.c
@@ -435,8 +435,13 @@ void wbt_set_min_lat(struct request_queue *q, u64 val)
 	struct rq_qos *rqos = wbt_rq_qos(q);
 	if (!rqos)
 		return;
+
 	RQWB(rqos)->min_lat_nsec = val;
-	RQWB(rqos)->enable_state = WBT_STATE_ON_MANUAL;
+	if (val)
+		RQWB(rqos)->enable_state = WBT_STATE_ON_MANUAL;
+	else
+		RQWB(rqos)->enable_state = WBT_STATE_OFF_MANUAL;
+
 	wbt_update_limits(RQWB(rqos));
 }
 
diff --git a/block/blk-wbt.h b/block/blk-wbt.h
index 7e44eccc676d..7fe98638fff5 100644
--- a/block/blk-wbt.h
+++ b/block/blk-wbt.h
@@ -28,13 +28,15 @@ enum {
 };
 
 /*
- * Enable states. Either off, or on by default (done at init time),
- * or on through manual setup in sysfs.
+ * If current state is WBT_STATE_ON/OFF_DEFAULT, it can be covered to any other
+ * state, if current state is WBT_STATE_ON/OFF_MANUAL, it can only be covered
+ * to WBT_STATE_OFF/ON_MANUAL.
  */
 enum {
-	WBT_STATE_ON_DEFAULT	= 1,
-	WBT_STATE_ON_MANUAL	= 2,
-	WBT_STATE_OFF_DEFAULT
+	WBT_STATE_ON_DEFAULT	= 1,	/* on by default */
+	WBT_STATE_ON_MANUAL	= 2,	/* on manually by sysfs */
+	WBT_STATE_OFF_DEFAULT	= 3,	/* off by default */
+	WBT_STATE_OFF_MANUAL	= 4,	/* off manually by sysfs */
 };
 
 struct rq_wb {
-- 
2.31.1