linux-kernel - Re: [PATCH v9 10/12] block: don't check blk_rq_is_passthrough() in blk_do_io

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Date:   Thu, 10 Oct 2019 12:05:26 +0200
From:   Christoph Hellwig <hch@....de>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Stephen Bates <sbates@...thlin.com>
Subject: Re: [PATCH v9 10/12] block: don't check blk_rq_is_passthrough() in
 blk_do_io_stat()

> @@ -319,7 +319,7 @@ static struct request *blk_mq_rq_ctx_init(struct blk_mq_alloc_data *data,
>  	rq->cmd_flags = op;
>  	if (data->flags & BLK_MQ_REQ_PREEMPT)
>  		rq->rq_flags |= RQF_PREEMPT;
> -	if (blk_queue_io_stat(data->q))
> +	if (blk_queue_io_stat(data->q) && !blk_rq_is_passthrough(rq))
>  		rq->rq_flags |= RQF_IO_STAT;

This needs a comment why we don't account passthrough requests by
default.  And I'm really curious about the answer, because I don't
know it myself.

>   *	a) it's attached to a gendisk, and
>   *	b) the queue had IO stats enabled when this request was started, and
> - *	c) it's a file system request
> + *	c) it's a file system request (RQF_IO_STAT will not be set otherwise)

c) should just go away now based on your changes.

>  static inline bool blk_do_io_stat(struct request *rq)
>  {
>  	return rq->rq_disk &&
> -	       (rq->rq_flags & RQF_IO_STAT) &&
> -		!blk_rq_is_passthrough(rq);
> +	       (rq->rq_flags & RQF_IO_STAT);

The check can be collapsed onto a single line now.