[dm-devel] use regular gendisk registration in device mapper

[Christoph Hellwig]

On Tue, Jul 27, 2021 at 10:38:16PM +0200, Milan Broz wrote:
> BTW it would be also nice to run cryptsetup testsuite as root - we do a lot
> of DM operations there (and we depend on sysfs on some places).

It already doesn't seem very happy in current mainline for me:

=======================
13 of 17 tests failed
(12 tests were not run)
=======================

but this series doesn't seem to change anything.

A lot of the not run tests seem to be due to broken assumptions
that some code must be modular.  E.g. my kernel has scsi_debug built
in, but it complains like this:

modprobe: ERROR: ../libkmod/libkmod.c:586 kmod_search_moddep() could not open moddep file '/lib/module'
modprobe: FATAL: Module scsi_debug not found in directory /lib/modules/5.14.0-rc3+