Re: [PATCH 3/5] blk-mq: add helper of blk_mq_global_quiesce_wait()

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On 11/22/21 9:56 AM, Sagi Grimberg wrote:

Add helper of blk_mq_global_quiesce_wait() for supporting to quiesce
queues in parallel, then we can just wait once if global quiesce wait
is allowed.

blk_mq_global_quiesce_wait() is a poor name... global is scope-less and
obviously it has a scope.


Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
---
  include/linux/blk-mq.h | 13 +++++++++++++
  1 file changed, 13 insertions(+)

diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 5cc7fc1ea863..a9fecda2507e 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -777,6 +777,19 @@ static inline bool blk_mq_add_to_batch(struct request *req,
      return true;
  }
+/*
+ * If the queue has allocated & used srcu to quiesce queue, quiesce wait is + * done via the synchronize_srcu(q->rcu), otherwise it is done via global
+ * synchronize_rcu().
+ *
+ * This helper can help us to support quiescing queue in parallel, so just
+ * one quiesce wait is enough if global quiesce wait is allowed.
+ */
+static inline bool blk_mq_global_quiesce_wait(struct request_queue *q)
+{
+    return !q->alloc_srcu;

	return !q->srcu ?



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