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blk-wbt: allow wbt to be enabled always through sysfs

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Currently there's no way to enable wbt if it's not enabled in the
kernel config by default for a device. Allow a write to the
'wbt_lat_usec' queue sysfs file to enable wbt.

This is useful for both the kernel config case, but also if the
device is CFQ managed and it was turned off by default.

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2016-11-28 09:40:34 -07:00
commit d62118b6dd
3 changed files with 29 additions and 7 deletions
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22
block/blk-sysfs.c
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@ -425,20 +425,30 @@ static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page,
ssize_t ret;
s64 val;
rwb = q->rq_wb;
if (!rwb)
return -EINVAL;
ret = queue_var_store64(&val, page);
if (ret < 0)
return ret;
if (val < -1)
return -EINVAL;
rwb = q->rq_wb;
if (!rwb) {
ret = wbt_init(q);
if (ret)
return ret;
rwb = q->rq_wb;
if (!rwb)
return -EINVAL;
}
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;
if (rwb->enable_state == WBT_STATE_ON_DEFAULT)
rwb->enable_state = WBT_STATE_ON_MANUAL;
wbt_update_limits(rwb);
return count;