diff options
| author | Keith Busch <keith.busch@intel.com> | 2017-03-01 22:22:10 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-03-02 18:56:04 +0300 |
| commit | 6bae363ee3057a14eec93440826813603559273a (patch) | |
| tree | 0f2b50ad0ed9469a72fa81968a4ff53bcd58397d | |
| parent | 6a8a21546507a3ec88e81c2ec927a3fb63efa8ff (diff) | |
| download | linux-6bae363ee3057a14eec93440826813603559273a.tar.xz | |
blk-mq: Export blk_mq_freeze_queue_wait
Drivers can start a freeze, so this provides a way to wait for frozen.
Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | block/blk-mq.c | 3 | ||||
| -rw-r--r-- | include/linux/blk-mq.h | 1 |
2 files changed, 3 insertions, 1 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 94593c6282d8..8da2c04bb88f 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -75,10 +75,11 @@ void blk_mq_freeze_queue_start(struct request_queue *q) } EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_start); -static void blk_mq_freeze_queue_wait(struct request_queue *q) +void blk_mq_freeze_queue_wait(struct request_queue *q) { wait_event(q->mq_freeze_wq, percpu_ref_is_zero(&q->q_usage_counter)); } +EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_wait); /* * Guarantee no request is in use, so we can change any data structure of diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 001d30d727c5..8dacf680c851 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -245,6 +245,7 @@ void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset, 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); +void blk_mq_freeze_queue_wait(struct request_queue *q); int blk_mq_reinit_tagset(struct blk_mq_tag_set *set); int blk_mq_map_queues(struct blk_mq_tag_set *set); |