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blk-wbt: don't show valid wbt_lat_usec in sysfs while wbt is disabled

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Currently, if wbt is initialized and then disabled by
wbt_disable_default(), sysfs will still show valid wbt_lat_usec, which
will confuse users that wbt is still enabled.

This patch shows wbt_lat_usec as zero if it's disabled.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reported-and-tested-by: Holger Hoffstätte <holger@applied-asynchrony.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20221019121518.3865235-5-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Yu Kuai 2022-10-19 20:15:16 +08:00 committed by Jens Axboe
parent a9a236d238
commit 3642ef4d95
3 changed files with 16 additions and 0 deletions
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3
block/blk-sysfs.c
View File

@ -470,6 +470,9 @@ static ssize_t queue_wb_lat_show(struct request_queue *q, char *page)
if (!wbt_rq_qos(q))
return -EINVAL;
if (wbt_disabled(q))
return sprintf(page, "0\n");
return sprintf(page, "%llu\n", div_u64(wbt_get_min_lat(q), 1000));
}

8
block/blk-wbt.c
View File

@ -422,6 +422,14 @@ static void wbt_update_limits(struct rq_wb *rwb)
rwb_wake_all(rwb);
}
bool wbt_disabled(struct request_queue *q)
{
struct rq_qos *rqos = wbt_rq_qos(q);
return !rqos || RQWB(rqos)->enable_state == WBT_STATE_OFF_DEFAULT ||
RQWB(rqos)->enable_state == WBT_STATE_OFF_MANUAL;
}
u64 wbt_get_min_lat(struct request_queue *q)
{
struct rq_qos *rqos = wbt_rq_qos(q);

5
block/blk-wbt.h
View File

@ -96,6 +96,7 @@ void wbt_enable_default(struct request_queue *);
u64 wbt_get_min_lat(struct request_queue *q);
void wbt_set_min_lat(struct request_queue *q, u64 val);
bool wbt_disabled(struct request_queue *);
void wbt_set_write_cache(struct request_queue *, bool);
@ -127,6 +128,10 @@ static inline u64 wbt_default_latency_nsec(struct request_queue *q)
{
return 0;
}
static inline bool wbt_disabled(struct request_queue *q)
{
return true;
}
#endif /* CONFIG_BLK_WBT */