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blk-wbt: don't create wbt sysfs entry if CONFIG_BLK_WBT is disabled

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sysfs entry /sys/block/[device]/queue/wbt_lat_usec will be created even
if CONFIG_BLK_WBT is disabled, while read and write will always fail.
It doesn't make sense to create a sysfs entry that can't be accessed,
so don't create such entry.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230527010644.647900-2-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Yu Kuai
2023-05-27 09:06:40 +08:00
committed by Jens Axboe
parent c6b7a3a26e
commit 645a829e03
2 changed files with 74 additions and 88 deletions
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19
block/blk-wbt.h
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@@ -18,10 +18,6 @@ u64 wbt_default_latency_nsec(struct request_queue *);
#else
static inline int wbt_init(struct gendisk *disk)
{
return -EINVAL;
}
static inline void wbt_disable_default(struct gendisk *disk)
{
}
@@ -31,21 +27,6 @@ static inline void wbt_enable_default(struct gendisk *disk)
static inline void wbt_set_write_cache(struct request_queue *q, bool wc)
{
}
static inline u64 wbt_get_min_lat(struct request_queue *q)
{
return 0;
}
static inline void wbt_set_min_lat(struct request_queue *q, u64 val)
{
}
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 */