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Subject[PATCH 2/4] blk-mq: retrieve bios before update nr_hw_queues
Date
retrieve bios of requests on queue to drain requests, then:
- avoid fail requests on dying hw queue
- needn't depend on storage device to drain the queue any more

Signed-off-by: Jianchao Wang <jianchao.w.wang@oracle.com>
---
block/blk-mq.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 3d59741..adc14f0 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -3013,7 +3013,15 @@ static void __blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set,
return;

list_for_each_entry(q, &set->tag_list, tag_set_list)
- blk_mq_freeze_queue(q);
+ blk_freeze_queue_start(q);
+
+ /*
+ * Wait the percpu ref to be switched to atomic mode.
+ */
+ synchronize_sched();
+
+ list_for_each_entry(q, &set->tag_list, tag_set_list)
+ blk_mq_sched_retrieve_bios(q);
/*
* Sync with blk_mq_queue_tag_busy_iter.
*/
--
2.7.4
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