Re: [PATCH 04/10] block: avoid unpinning/freeing the bio_vec incase of cloned bio

[Christoph Hellwig <hch@lst.de>]

On Fri, Apr 26, 2024 at 12:09:37AM +0530, Kanchan Joshi wrote:
> From: Anuj Gupta <anuj20.g@samsung.com>
> 
> Do it only once when the parent bio completes.
> 
> Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
> Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
> ---
>  block/bio-integrity.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/block/bio-integrity.c b/block/bio-integrity.c
> index b4042414a08f..b698eb77515d 100644
> --- a/block/bio-integrity.c
> +++ b/block/bio-integrity.c
> @@ -119,7 +119,8 @@ static void bio_integrity_uncopy_user(struct bio_integrity_payload *bip)
>  	ret = copy_to_iter(bvec_virt(&src_bvec), bytes, &iter);
>  	WARN_ON_ONCE(ret != bytes);
>  
> -	bio_integrity_unpin_bvec(copy, nr_vecs, true);
> +	if (!bio_flagged((bip->bip_bio), BIO_CLONED))
> +		bio_integrity_unpin_bvec(copy, nr_vecs, true);
>  }

This feels wrong.  I suspect the problem is that BIP_COPY_USER is
inherited for clone bios while it shouldn't.