linux-kernel - Re: [PATCH BUGFIX V2] block: add missing group association in bio-cloning functions

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Date:	Tue, 10 May 2016 17:34:50 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Paolo Valente <paolo.valente@...aro.org>
Cc:	Jens Axboe <axboe@...nel.dk>, Tejun Heo <tj@...nel.org>,
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	ulf.hansson@...aro.org, linus.walleij@...aro.org,
	broonie@...nel.org, stable@...r.kernel.org
Subject: Re: [PATCH BUGFIX V2] block: add missing group association in bio-cloning functions

Paolo Valente <paolo.valente@...aro.org> writes:

> diff --git a/block/bio.c b/block/bio.c
> index 807d25e..e9b136a 100644
> --- a/block/bio.c
> +++ b/block/bio.c
> @@ -622,6 +622,8 @@ struct bio *bio_clone_fast(struct bio *bio, gfp_t gfp_mask, struct bio_set *bs)
>  		}
>  	}
>  
> +	bio_clone_blkcg_association(b, bio);
> +
>  	return b;
>  }
>  EXPORT_SYMBOL(bio_clone_fast);
> @@ -695,6 +697,8 @@ integrity_clone:
>  		}
>  	}
>  
> +	bio_clone_blkcg_association(bio, bio_src);
> +
>  	return bio;
>  }
>  EXPORT_SYMBOL(bio_clone_bioset);
> @@ -1811,6 +1815,8 @@ struct bio *bio_split(struct bio *bio, int sectors,
>  
>  	bio_advance(bio, split->bi_iter.bi_size);
>  
> +	bio_clone_blkcg_association(split, bio);
> +

Hi, Paolo,

Did you test this?  bio_split calls bio_clone_bioset or bio_clone_fast,
so I'd be surprised if you didn't trigger that newly added warning.  :-)
Please remove the bio_split call site.

Cheers,
Jeff