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authorSagi Grimberg <sagig@mellanox.com>2016-03-10 13:58:46 +0200
committerJens Axboe <axboe@fb.com>2016-04-12 13:43:53 -0600
commite0489487ec9cd79ee1fa0dc5d3789c08b0e51a2c (patch)
treee970b4bbd0d17b9049b243171ed65438e3f5053a
parent37e58237a16b94fcd2c2d1b7e9c6e1ca661c231b (diff)
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>
-rw-r--r--block/blk-mq-tag.c12
-rw-r--r--include/linux/blk-mq.h2
2 files changed, 14 insertions, 0 deletions
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index abdbb47405cb..2fd04286f103 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -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)
{
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 9ac9799b702b..c808fec1ce44 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -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);