[PATCH v4 09/11] block: add support to pass user meta buffer

[Christoph Hellwig]

On Wed, Oct 16, 2024 at 04:59:10PM +0530, Anuj Gupta wrote:
> From: Kanchan Joshi <joshi.k at samsung.com>
> 
> If an iocb contains metadata, extract that and prepare the bip.
> Based on flags specified by the user, set corresponding guard/app/ref
> tags to be checked in bip.
> 
> Signed-off-by: Anuj Gupta <anuj20.g at samsung.com>
> Signed-off-by: Kanchan Joshi <joshi.k at samsung.com>
> ---
>  block/bio-integrity.c         | 51 +++++++++++++++++++++++++++++++++++
>  block/fops.c                  | 44 +++++++++++++++++++++++-------
>  include/linux/bio-integrity.h |  7 +++++
>  3 files changed, 93 insertions(+), 9 deletions(-)
> 
> diff --git a/block/bio-integrity.c b/block/bio-integrity.c
> index d3c8b56d3fe6..24fad9b6f3ec 100644
> --- a/block/bio-integrity.c
> +++ b/block/bio-integrity.c
> @@ -12,6 +12,7 @@
>  #include <linux/bio.h>
>  #include <linux/workqueue.h>
>  #include <linux/slab.h>
> +#include <uapi/linux/blkdev.h>
>  #include "blk.h"
>  
>  static struct kmem_cache *bip_slab;
> @@ -303,6 +304,55 @@ static unsigned int bvec_from_pages(struct bio_vec *bvec, struct page **pages,
>  	return nr_bvecs;
>  }
>  
> +static void bio_uio_meta_to_bip(struct bio *bio, struct uio_meta *meta)
> +{
> +	struct bio_integrity_payload *bip = bio_integrity(bio);
> +
> +	if (meta->flags & BLK_INTEGRITY_CHK_GUARD)
> +		bip->bip_flags |= BIP_CHECK_GUARD;
> +	if (meta->flags & BLK_INTEGRITY_CHK_APPTAG)
> +		bip->bip_flags |= BIP_CHECK_APPTAG;
> +	if (meta->flags & BLK_INTEGRITY_CHK_REFTAG)
> +		bip->bip_flags |= BIP_CHECK_REFTAG;
> +
> +	bip->app_tag = meta->app_tag;
> +}
> +
> +int bio_integrity_map_iter(struct bio *bio, struct uio_meta *meta)

Just noticed this when looking at the seed situation:  Can you please
move bio_integrity_map_iter below bio_integrity_map_user as it is
a relatively thing wrapper for it?