[PATCH 3/5] blk-mq: add helper of blk_mq_global_quiesce_wait()
Sagi Grimberg
sagi at grimberg.me
Mon Nov 22 00:00:14 PST 2021
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 at redhat.com>
>> ---
>> 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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