[dm-devel] [PATCH 3/3] dm: allow error target to replace immutable target

[Mikulas Patocka]

On Thu, 29 Aug 2013, Mike Snitzer wrote:

> On Thu, Aug 29 2013 at 10:37am -0400,
> Mikulas Patocka <mpatocka at redhat.com> wrote:
> 
> > As I said - I think it would be better to remove the immutable flag than 
> > to create more flags to bypass it.
> 
> Immutable was introduced to prevent dangerous scenarios that weren't
> accounted for in original design, etc.  It solved your crash when you
> rep;aced a thin-pool with an empty table.
> 
> immutable is staying for now.  And as it turns out allowing error target
> to override an immutable target was always held to be a logical/possible
> future relaxation of the immutable constraint.
> 
> Mike

If you can replace a thin-pool target with an error target - so why can't 
you replace a thin-pool target with linear (or any other) target?

I don't see why the error target should be special.

Mikulas