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blk-wbt: allow reset of default latency through sysfs

Browse source 
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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22
block/blk-sysfs.c
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@ -42,12 +42,12 @@ queue_var_store(unsigned long *var, const char *page, size_t count)
return count;
}
static ssize_t queue_var_store64(u64 *var, const char *page)
static ssize_t queue_var_store64(s64 *var, const char *page)
{
int err;
u64 v;
s64 v;
err = kstrtou64(page, 10, &v);
err = kstrtos64(page, 10, &v);
if (err < 0)
return err;
@ -421,18 +421,26 @@ static ssize_t queue_wb_lat_show(struct request_queue *q, char *page)
static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page,
size_t count)
{
struct rq_wb *rwb;
ssize_t ret;
u64 val;
s64 val;
if (!q->rq_wb)
rwb = q->rq_wb;
if (!rwb)
return -EINVAL;
ret = queue_var_store64(&val, page);
if (ret < 0)
return ret;
q->rq_wb->min_lat_nsec = val * 1000ULL;
wbt_update_limits(q->rq_wb);
if (val == -1)
rwb->min_lat_nsec = wbt_default_latency_nsec(q);
else if (val >= 0)
rwb->min_lat_nsec = val * 1000ULL;
else
return -EINVAL;
wbt_update_limits(rwb);
return count;
}