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Commit ffa358dc authored by Jens Axboe's avatar Jens Axboe
Browse files

blk-wbt: move disable check into get_limit() 



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

Tested-by: default avatarAnchal Agarwal <anchalag@amazon.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 3943b040

block/blk-wbt.c

+7 −15
Original line number Diff line number Diff line
@@ -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;