[RFC][PATCH] device mapper: Add builtin function dm_get_status()

[Christoph Hellwig]

On Wed, Dec 01, 2021 at 05:37:08PM +0100, Roberto Sassu wrote:
> Users of the device mapper driver might want to obtain a device status,
> with status types defined in the status_type_t enumerator.

The patch looks really odd.  And without the corresponding user of your
new functionality it is entirely unreviewable anyway.