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| author | Jens Axboe <axboe@fb.com> | 2016-11-28 09:22:47 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-11-28 10:27:03 -0700 |
| commit | 80e091d10e8bf7b801d634ea8870b9e907314424 (patch) | |
| tree | 05d99a001b158de7e3f6f9eb119f28bb226b8bc2 /block/blk-wbt.h | |
| parent | feffa5cc7b47f38210d4997ceb3fe30881d6c337 (diff) | |
| download | lwn-80e091d10e8bf7b801d634ea8870b9e907314424.tar.gz lwn-80e091d10e8bf7b801d634ea8870b9e907314424.zip | |
blk-wbt: allow reset of default latency through sysfs
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 <axboe@fb.com>
Diffstat (limited to 'block/blk-wbt.h')
| -rw-r--r-- | block/blk-wbt.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/block/blk-wbt.h b/block/blk-wbt.h index 44dc2173dc1f..9dfc88ad7f30 100644 --- a/block/blk-wbt.h +++ b/block/blk-wbt.h @@ -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 */ |