[PATCH 5/8] blk-mq: add tagset quiesce interface

[Hannes Reinecke]

On 10/20/22 12:56, Christoph Hellwig wrote:
> From: Chao Leng <lengchao at huawei.com>
> 
> Drivers that have shared tagsets may need to quiesce potentially a lot
> of request queues that all share a single tagset (e.g. nvme). Add an
> interface to quiesce all the queues on a given tagset. This interface is
> useful because it can speedup the quiesce by doing it in parallel.
> 
> Because some queues should not need to be quiesced(e.g. nvme connect_q)
> when quiesce the tagset. So introduce QUEUE_FLAG_SKIP_TAGSET_QUIESCE to
> tagset quiesce interface to skip the queue.
> 
> Signed-off-by: Chao Leng <lengchao at huawei.com>
> [hch: simplify for the per-tag_set srcu_struct]
> Signed-off-by: Christoph Hellwig <hch at lst.de>
> ---
>   block/blk-mq.c         | 25 +++++++++++++++++++++++++
>   include/linux/blk-mq.h |  2 ++
>   include/linux/blkdev.h |  3 +++
>   3 files changed, 30 insertions(+)
> 
Reviewed-by: Hannes Reinecke <hare at suse.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
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