[PATCH 05/12] blk-mq: Introduce blk_mq_quiesce_queue()

Bart Van Assche bart.vanassche at sandisk.com
Thu Oct 27 08:56:50 PDT 2016

On 10/26/2016 10:52 PM, Hannes Reinecke wrote:
> Hmm. Can't say I like having to have two RCU structure for the same
> purpose, but I guess that can't be helped.

Hello Hannes,

There are two RCU structures because of BLK_MQ_F_BLOCKING. Today only 
the nbd driver sets that flag. If the nbd driver would be modified such 
that it doesn't set that flag then the BLK_MQ_F_BLOCKING flag and also 
queue_rq_srcu could be eliminated from the blk-mq core.


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