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

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 <>
[hch: carefully check for valid tagsets]
Reviewed-by: default avatarChristoph Hellwig <>
Reviewed-by: default avatarJohannes Thumshirn <>
Signed-off-by: default avatarJens Axboe <>
parent 37e58237
......@@ -474,6 +474,18 @@ void blk_mq_all_tag_busy_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
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);
void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
void *priv)
......@@ -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);
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