[PATCH] block: always allocate integrity buffer when required

[Christoph Hellwig]

On Thu, May 08, 2025 at 10:58:14AM -0700, Keith Busch wrote:
> Add a new blk_integrity flag to indicate if the disk format requires an
> integrity buffer. When this flag is set, provide an unchecked buffer if
> the sysfs attributes disabled verify or generation. This fixes the
> following nvme warning:

Do we even need the flag?  I think we could just deduce it from
tag_size < tuple_size, which feels more robust.

Otherwise this looks good to me.