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blk-wbt: allow reset of default latency through sysfs

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Allow a write of '-1' to reset the default latency target for
a given device. This removes knowledge of the different default
settings for rotational vs non-rotational from user space.

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2016-11-28 09:22:47 -07:00
commit 80e091d10e
4 changed files with 37 additions and 12 deletions
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6
block/blk-wbt.h
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@ -110,6 +110,8 @@ void wbt_disable(struct rq_wb *);
void wbt_set_queue_depth(struct rq_wb *, unsigned int);
void wbt_set_write_cache(struct rq_wb *, bool);
u64 wbt_default_latency_nsec(struct request_queue *);
#else
static inline void __wbt_done(struct rq_wb *rwb, enum wbt_flags flags)
@ -148,6 +150,10 @@ static inline void wbt_set_queue_depth(struct rq_wb *rwb, unsigned int depth)
static inline void wbt_set_write_cache(struct rq_wb *rwb, bool wc)
{
}
static inline u64 wbt_default_latency_nsec(struct request_queue *q)
{
return 0;
}
#endif /* CONFIG_BLK_WBT */