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blk-wbt: move disable check into get_limit() 

Check it in one place, instead of in multiple places.

Tested-by: Anchal Agarwal <anchalag@amazon.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
hifive-unleashed-5.1
Jens Axboe 2018-08-20 13:24:25 -06:00
parent 3943b040f1
commit ffa358dcaa
1 changed files with 7 additions and 15 deletions
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22
block/blk-wbt.c
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@ -449,6 +449,13 @@ static inline unsigned int get_limit(struct rq_wb *rwb, unsigned long rw)
{
unsigned int limit;
/*
* If we got disabled, just return UINT_MAX. This ensures that
* we'll properly inc a new IO, and dec+wakeup at the end.
*/
if (!rwb_enabled(rwb))
return UINT_MAX;
if ((rw & REQ_OP_MASK) == REQ_OP_DISCARD)
return rwb->wb_background;
@ -486,16 +493,6 @@ static void __wbt_wait(struct rq_wb *rwb, enum wbt_flags wb_acct,
struct rq_wait *rqw = get_rq_wait(rwb, wb_acct);
DECLARE_WAITQUEUE(wait, current);
/*
* inc it here even if disabled, since we'll dec it at completion.
* this only happens if the task was sleeping in __wbt_wait(),
* and someone turned it off at the same time.
*/
if (!rwb_enabled(rwb)) {
atomic_inc(&rqw->inflight);
return;
}
if (!waitqueue_active(&rqw->wait)
&& rq_wait_inc_below(rqw, get_limit(rwb, rw)))
return;
@ -504,11 +501,6 @@ static void __wbt_wait(struct rq_wb *rwb, enum wbt_flags wb_acct,
do {
set_current_state(TASK_UNINTERRUPTIBLE);
if (!rwb_enabled(rwb)) {
atomic_inc(&rqw->inflight);
break;
}
if (rq_wait_inc_below(rqw, get_limit(rwb, rw)))
break;