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blk-wbt: cleanup rwb_enabled() and wbt_disabled() 

'wb_normal' will set to 0 if 'min_lat_nsec' is 0, and 'min_lat_nsec' can
only be set to 0 through sysfs configuration where 'WBT_STATE_OFF_MANUAL'
is set together, in the meantime, they can only be cleared together
through sysfs afterwards. Hence 'wb_normal != 0' is the same as
'rwb->enable_state != WBT_STATE_OFF_MANUAL'.

The code is redundan, hence replace the checking of 'wb_normal' to
'enable_state' in rwb_enabled() and reuse rwb_enabled() for
wbt_disabled().

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230527010644.647900-4-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Yu Kuai 2023-05-27 09:06:42 +08:00 committed by Jens Axboe
parent 71b8642e79
commit 06257fda83
1 changed files with 2 additions and 3 deletions
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5
block/blk-wbt.c
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@ -146,7 +146,7 @@ enum {
static inline bool rwb_enabled(struct rq_wb *rwb)
{
return rwb && rwb->enable_state != WBT_STATE_OFF_DEFAULT &&
rwb->wb_normal != 0;
rwb->enable_state != WBT_STATE_OFF_MANUAL;
}
static void wb_timestamp(struct rq_wb *rwb, unsigned long *var)
@ -494,8 +494,7 @@ 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;
return !rqos || !rwb_enabled(RQWB(rqos));
}
u64 wbt_get_min_lat(struct request_queue *q)