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Commit e0489487 authored by Sagi Grimberg's avatar Sagi Grimberg Committed by Jens Axboe
Browse files

blk-mq: Export tagset iter function 



Its useful to iterate on all the active tags in cases
where we will need to fail all the queues IO.

Signed-off-by: default avatarSagi Grimberg <sagig@mellanox.com>
[hch: carefully check for valid tagsets]
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 37e58237

block/blk-mq-tag.c

+12 −0
Original line number Diff line number Diff line
@@ -474,6 +474,18 @@ void blk_mq_all_tag_busy_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn, 
}

EXPORT_SYMBOL(blk_mq_all_tag_busy_iter);



void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,

		busy_tag_iter_fn *fn, void *priv)

{

	int i;



	for (i = 0; i < tagset->nr_hw_queues; i++) {

		if (tagset->tags && tagset->tags[i])

			blk_mq_all_tag_busy_iter(tagset->tags[i], fn, priv);

	}

}

EXPORT_SYMBOL(blk_mq_tagset_busy_iter);



void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,

		void *priv)

{

include/linux/blk-mq.h

+2 −0
Original line number Diff line number Diff line
@@ -240,6 +240,8 @@ void blk_mq_run_hw_queues(struct request_queue *q, bool async); 
void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);

void blk_mq_all_tag_busy_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,

		void *priv);

void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,

		busy_tag_iter_fn *fn, void *priv);

void blk_mq_freeze_queue(struct request_queue *q);

void blk_mq_unfreeze_queue(struct request_queue *q);

void blk_mq_freeze_queue_start(struct request_queue *q);