[dm-devel] [PATCH 4/8] block: support delayed holder registration

[Mike Snitzer]

On Sun, Jul 25 2021 at  1:54P -0400,
Christoph Hellwig <hch at lst.de> wrote:

> device mapper needs to register holders before it is ready to do I/O.
> Currently it does so by registering the disk early, which has all kinds
> of bad side effects.  Support registering holders on an initialized but
> not registered disk instead by delaying the sysfs registration until the
> disk is registered.

This header starts to shine some light on what is motivating this
series by touching on "all kinds of bad side effects" being fixed.
Any chance you could elaborate what you've noticed/found/hit?

Mike