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: Sagi Grimberg <sagig@mellanox.com>
[hch: carefully check for valid tagsets]
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index abdbb47..2fd0428 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -474,6 +474,18 @@
}
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)
{