linux-kernel - Re: [PATCH 05/13] blkcg: associate blkg when associating a device

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Date:   Fri, 30 Nov 2018 01:54:26 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Dennis Zhou <dennis@...nel.org>
Cc:     Jens Axboe <axboe@...nel.dk>, Tejun Heo <tj@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Josef Bacik <josef@...icpanda.com>, kernel-team@...com,
        linux-block@...r.kernel.org, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/13] blkcg: associate blkg when associating a device

> diff --git a/include/linux/bio.h b/include/linux/bio.h
> index 62715a5a4f32..8bc9d9b29fd3 100644
> --- a/include/linux/bio.h
> +++ b/include/linux/bio.h
> @@ -486,6 +486,12 @@ extern unsigned int bvec_nr_vecs(unsigned short idx);
>  extern const char *bio_devname(struct bio *bio, char *buffer);
>  
>  #define bio_set_dev(bio, bdev) 			\
> +do {						\
> +	bio_set_dev_only(bio, bdev);		\
> +	bio_associate_blkg(bio);		\
> +} while (0)
> +
> +#define bio_set_dev_only(bio, bdev)		\

This lacks any explanation on when you would use bio_set_dev_only or
bio_set_dev.  Please document why we need both and why you'd choose or
the other.