Re: [PATCH 1/2] block: change plugging to use a singly linked list

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On 10/19/21 7:34 AM, Christoph Hellwig wrote:
> On Tue, Oct 19, 2021 at 06:08:33AM -0600, Jens Axboe wrote:
>> +						!from_schedule);
>> +			blk_mq_sched_insert_requests(this_hctx, this_ctx,
>> +						&list, from_schedule);
>> +			depth = 0;
>> +			this_hctx = rq->mq_hctx;
>> +			this_ctx = rq->mq_ctx;
>> +
>>  		}
>>  
>> +		list_add(&rq->queuelist, &list);
> 
> I think this needs to be a list_add_tail to keep the request ordered.

I think it does the right thing, the singly linked list is LIFO, so we
effectively just reverse it here.

-- 
Jens Axboe




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