[RFC PATCH v2 09/11] block: Add BLK_STS_P2PDMA

[Christoph Hellwig]

On Thu, Mar 11, 2021 at 04:31:39PM -0700, Logan Gunthorpe wrote:
> Create a specific error code for when P2PDMA pages are passed to a block
> devices that cannot map them (due to no IOMMU support or ACS protections).
> 
> This makes request errors in these cases more informative of as to what
> caused the error.

I really don't think we should bother with a specific error code here,
we don't add a new status for every single possible logic error in the
caller.