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Date:   Thu, 27 Sep 2018 10:23:29 -0400
From:   Mike Snitzer <snitzer@redhat.com>
To:     Richard Weinberger <richard.weinberger@gmail.com>
Cc:     helen.koike@collabora.com,
        device-mapper development <dm-devel@redhat.com>,
        agk@redhat.com, LKML <linux-kernel@vger.kernel.org>,
        enric.balletbo@collabora.com, Will Drewry <wad@chromium.org>,
        linux-doc@vger.kernel.org, linux-lvm@redhat.com,
        kernel@collabora.com
Subject: Re: [PATCH 0/2] boot to a mapped device
Message-ID: <20180927142328.GA4074@redhat.com>
References: <cover.1537936397.git.helen.koike@collabora.com>
 <CAFLxGvzCDOTR4stPmp1TTLkQ39x3e8MQuL=AR754abKc5skhpA@mail.gmail.com>
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On Wed, Sep 26 2018 at  3:16am -0400,
Richard Weinberger <richard.weinberger@gmail.com> wrote:

> Helen,
> 
> On Wed, Sep 26, 2018 at 7:01 AM Helen Koike <helen.koike@collabora.com> wrote:
> >
> > This series is reviving an old patchwork.
> > Booting from a mapped device requires an initramfs. This series is
> > allows for device-mapper targets to be configured at boot time for
> > use early in the boot process (as the root device or otherwise).
> 
> What is the reason for this patch series?
> Setting up non-trivial root filesystems/storage always requires an
> initramfs, there is nothing
> wrong about this.

Exactly.  If phones or whatever would benefit from this patchset then
say as much.

I will not accept this patchset at this time.

> > Example, the following could be added in the boot parameters.
> > dm="lroot,,,rw, 0 4096 linear 98:16 0, 4096 4096 linear 98:32 0" root=/dev/dm-0
> 
> Hmmm, the new dm= parameter is anything but easy to get right.

No, it isn't.. exposes way too much potential for users hanging
themselves.