Commit a0235d23 authored by John Garry's avatar John Garry Committed by Jens Axboe
Browse files

blk-mq: Relocate hctx_may_queue() 



blk-mq.h and blk-mq-tag.h include on each other, which is less than ideal.

Locate hctx_may_queue() to blk-mq.h, as it is not really tag specific code.

In this way, we can drop the blk-mq-tag.h include of blk-mq.h

Signed-off-by: default avatarJohn Garry <john.garry@huawei.com>
Tested-by: default avatarDouglas Gilbert <dgilbert@interlog.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 32bc15af

block/blk-mq-tag.h

+0 −33
Original line number Diff line number Diff line
@@ -2,8 +2,6 @@ 
#ifndef INT_BLK_MQ_TAG_H

#define INT_BLK_MQ_TAG_H



#include "blk-mq.h"



/*

 * Tag address space map.

 */
@@ -81,37 +79,6 @@ static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx) 
	__blk_mq_tag_idle(hctx);

}



/*

 * For shared tag users, we track the number of currently active users

 * and attempt to provide a fair share of the tag depth for each of them.

 */

static inline bool hctx_may_queue(struct blk_mq_hw_ctx *hctx,

				  struct sbitmap_queue *bt)

{

	unsigned int depth, users;



	if (!hctx || !(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))

		return true;

	if (!test_bit(BLK_MQ_S_TAG_ACTIVE, &hctx->state))

		return true;



	/*

	 * Don't try dividing an ant

	 */

	if (bt->sb.depth == 1)

		return true;



	users = atomic_read(&hctx->tags->active_queues);

	if (!users)

		return true;



	/*

	 * Allow at least some tags

	 */

	depth = max((bt->sb.depth + users - 1) / users, 4U);

	return atomic_read(&hctx->nr_active) < depth;

}



static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,

					  unsigned int tag)

{

block/blk-mq.h

+32 −0
Original line number Diff line number Diff line
@@ -259,4 +259,36 @@ static inline struct blk_plug *blk_mq_plug(struct request_queue *q, 
	return NULL;

}



/*

 * For shared tag users, we track the number of currently active users

 * and attempt to provide a fair share of the tag depth for each of them.

 */

static inline bool hctx_may_queue(struct blk_mq_hw_ctx *hctx,

				  struct sbitmap_queue *bt)

{

	unsigned int depth, users;



	if (!hctx || !(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))

		return true;

	if (!test_bit(BLK_MQ_S_TAG_ACTIVE, &hctx->state))

		return true;



	/*

	 * Don't try dividing an ant

	 */

	if (bt->sb.depth == 1)

		return true;



	users = atomic_read(&hctx->tags->active_queues);

	if (!users)

		return true;



	/*

	 * Allow at least some tags

	 */

	depth = max((bt->sb.depth + users - 1) / users, 4U);

	return atomic_read(&hctx->nr_active) < depth;

}





#endif

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