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Commit 771949d0 authored by Jens Axboe's avatar Jens Axboe
Browse files

block: get rid of on-stack plugging debug checks 



We don't need them anymore, so kill:

- REQ_ON_PLUG checks in various places
- !rq_mergeable() check in plug merging

Signed-off-by: default avatarJens Axboe <jaxboe@fusionio.com>
parent 0eb8e885

block/blk-core.c

+0 −27
Original line number Diff line number Diff line
@@ -569,8 +569,6 @@ int blk_get_queue(struct request_queue *q) 


static inline void blk_free_request(struct request_queue *q, struct request *rq)

{

	BUG_ON(rq->cmd_flags & REQ_ON_PLUG);



	if (rq->cmd_flags & REQ_ELVPRIV)

		elv_put_request(q, rq);

	mempool_free(rq, q->rq.rq_pool);
@@ -1110,14 +1108,6 @@ static bool bio_attempt_back_merge(struct request_queue *q, struct request *req, 
{

	const int ff = bio->bi_rw & REQ_FAILFAST_MASK;



	/*

	 * Debug stuff, kill later

	 */

	if (!rq_mergeable(req)) {

		blk_dump_rq_flags(req, "back");

		return false;

	}



	if (!ll_back_merge_fn(q, req, bio))

		return false;
@@ -1141,14 +1131,6 @@ static bool bio_attempt_front_merge(struct request_queue *q, 
	const int ff = bio->bi_rw & REQ_FAILFAST_MASK;

	sector_t sector;



	/*

	 * Debug stuff, kill later

	 */

	if (!rq_mergeable(req)) {

		blk_dump_rq_flags(req, "front");

		return false;

	}



	if (!ll_front_merge_fn(q, req, bio))

		return false;
@@ -1258,14 +1240,12 @@ static int __make_request(struct request_queue *q, struct bio *bio) 


	el_ret = elv_merge(q, &req, bio);

	if (el_ret == ELEVATOR_BACK_MERGE) {

		BUG_ON(req->cmd_flags & REQ_ON_PLUG);

		if (bio_attempt_back_merge(q, req, bio)) {

			if (!attempt_back_merge(q, req))

				elv_merged_request(q, req, el_ret);

			goto out_unlock;

		}

	} else if (el_ret == ELEVATOR_FRONT_MERGE) {

		BUG_ON(req->cmd_flags & REQ_ON_PLUG);

		if (bio_attempt_front_merge(q, req, bio)) {

			if (!attempt_front_merge(q, req))

				elv_merged_request(q, req, el_ret);
@@ -1320,10 +1300,6 @@ get_rq: 
			if (__rq->q != q)

				plug->should_sort = 1;

		}

		/*

		 * Debug flag, kill later

		 */

		req->cmd_flags |= REQ_ON_PLUG;

		list_add_tail(&req->queuelist, &plug->list);

		drive_stat_acct(req, 1);

	} else {
@@ -2749,7 +2725,6 @@ void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule) 
	while (!list_empty(&list)) {

		rq = list_entry_rq(list.next);

		list_del_init(&rq->queuelist);

		BUG_ON(!(rq->cmd_flags & REQ_ON_PLUG));

		BUG_ON(!rq->q);

		if (rq->q != q) {

			/*
@@ -2761,8 +2736,6 @@ void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule) 
			depth = 0;

			spin_lock(q->queue_lock);

		}

		rq->cmd_flags &= ~REQ_ON_PLUG;



		/*

		 * rq is already accounted, so use raw insert

		 */

block/elevator.c

+0 −4
Original line number Diff line number Diff line
@@ -416,8 +416,6 @@ void elv_dispatch_sort(struct request_queue *q, struct request *rq) 
	struct list_head *entry;

	int stop_flags;



	BUG_ON(rq->cmd_flags & REQ_ON_PLUG);



	if (q->last_merge == rq)

		q->last_merge = NULL;
@@ -656,8 +654,6 @@ void __elv_add_request(struct request_queue *q, struct request *rq, int where) 


	rq->q = q;



	BUG_ON(rq->cmd_flags & REQ_ON_PLUG);



	if (rq->cmd_flags & REQ_SOFTBARRIER) {

		/* barriers are scheduling boundary, update end_sector */

		if (rq->cmd_type == REQ_TYPE_FS ||

include/linux/blk_types.h

+0 −2
Original line number Diff line number Diff line
@@ -151,7 +151,6 @@ enum rq_flag_bits { 
	__REQ_IO_STAT,		/* account I/O stat */

	__REQ_MIXED_MERGE,	/* merge of different types, fail separately */

	__REQ_SECURE,		/* secure discard (used with __REQ_DISCARD) */

	__REQ_ON_PLUG,		/* on plug list */

	__REQ_NR_BITS,		/* stops here */

};
@@ -192,6 +191,5 @@ enum rq_flag_bits { 
#define REQ_IO_STAT		(1 << __REQ_IO_STAT)

#define REQ_MIXED_MERGE		(1 << __REQ_MIXED_MERGE)

#define REQ_SECURE		(1 << __REQ_SECURE)

#define REQ_ON_PLUG		(1 << __REQ_ON_PLUG)



#endif /* __LINUX_BLK_TYPES_H */