linux-kernel - Re: [PATCH 1/2] blk-integrity: add rq_integrity_payload

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Message-ID: <91df2b07-02a2-d034-bd8b-a67c13ca085a@nvidia.com>
Date:   Wed, 12 Apr 2023 05:41:11 +0000
From:   Chaitanya Kulkarni <chaitanyak@...dia.com>
To:     "j-young.choi@...sung.com" <j-young.choi@...sung.com>,
        "kbusch@...nel.org" <kbusch@...nel.org>,
        "axboe@...com" <axboe@...com>, "hch@....de" <hch@....de>,
        "sagi@...mberg.me" <sagi@...mberg.me>,
        "chaitanya.kulkarni@....com" <chaitanya.kulkarni@....com>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] blk-integrity: add rq_integrity_payload_size helper

On 4/11/23 22:21, Jinyoung CHOI wrote:
> This provides a nice shortcut to get the size of the integrity data
> for the driver like NVMe that only support a single integrity segment.
>
> Signed-off-by: Jinyoung Choi <j-young.choi@...sung.com>
> ---
>   include/linux/blk-integrity.h | 7 +++++++
>   1 file changed, 7 insertions(+)
>
> diff --git a/include/linux/blk-integrity.h b/include/linux/blk-integrity.h
> index 378b2459efe2..abf1923f4aa5 100644
> --- a/include/linux/blk-integrity.h
> +++ b/include/linux/blk-integrity.h
> @@ -114,6 +114,13 @@ static inline struct bio_vec *rq_integrity_vec(struct request *rq)
>   		return NULL;
>   	return rq->bio->bi_integrity->bip_vec;
>   }
> +
> +static inline unsigned int rq_integrity_payload_size(struct request *rq)
> +{
> +	if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1))
> +		return 0;
> +	return rq->bio->bi_integrity->bip_iter.bi_size;
> +}
>   #else /* CONFIG_BLK_DEV_INTEGRITY */
>   static inline int blk_rq_count_integrity_sg(struct request_queue *q,
>   					    struct bio *b)

from the comments that I got in the past, you should only be adding
a helper in the patch that is actually using it.

-ck