Re: [PATCH 1/3] block: move ref_tag calculation func to the block layer

[Christoph Hellwig <hch@xxxxxx>]

>  		case NVME_NS_DPS_PI_TYPE2:
>  			control |= NVME_RW_PRINFO_PRCHK_GUARD |
>  					NVME_RW_PRINFO_PRCHK_REF;
> -			cmnd->rw.reftag = cpu_to_le32(
> -					nvme_block_nr(ns, blk_rq_pos(req)));
> +			cmnd->rw.reftag = cpu_to_le32(t10_pi_ref_tag(req));

Note that this changes behavior for non-512 byte block sizes.  But
I think these changes do the right thing..