linux-kernel - Re: [PATCH v2 2/3] init/do_cmounts.c: introduce 'user

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Message-ID: <CADxym3bwK3c+E7nKpogT21jMPOZEZeLa8zauxSu0VHg5AAz-Uw@mail.gmail.com>
Date:   Wed, 26 May 2021 16:23:10 +0800
From:   Menglong Dong <menglong8.dong@...il.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Luis Chamberlain <mcgrof@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Kees Cook <keescook@...omium.org>,
        Sami Tolvanen <samitolvanen@...gle.com>, ojeda@...nel.org,
        johan@...nel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        masahiroy@...nel.org, Menglong Dong <dong.menglong@....com.cn>,
        joe@...ches.com, Jens Axboe <axboe@...nel.dk>, hare@...e.de,
        Jan Kara <jack@...e.cz>, tj@...nel.org,
        gregkh@...uxfoundation.org, song@...nel.org,
        NeilBrown <neilb@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        f.fainelli@...il.com, arnd@...db.de,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        wangkefeng.wang@...wei.com, Barret Rhoden <brho@...gle.com>,
        mhiramat@...nel.org, Steven Rostedt <rostedt@...dmis.org>,
        vbabka@...e.cz, Alexander Potapenko <glider@...gle.com>,
        pmladek@...e.com, Chris Down <chris@...isdown.name>,
        jojing64@...il.com, terrelln@...com, geert@...ux-m68k.org,
        mingo@...nel.org, linux-fsdevel@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>, jeyu@...nel.org
Subject: Re: [PATCH v2 2/3] init/do_cmounts.c: introduce 'user_root' for initramfs

On Wed, May 26, 2021 at 11:23 AM Eric W. Biederman
<ebiederm@...ssion.com> wrote:
>
> Menglong Dong <menglong8.dong@...il.com> writes:
>
[...]
>
> If we are going to do this something that is so small and clean it can
> be done unconditionally always.
>
> I will see if I can dig in and look at little more.  I think there is
> a reason Al Viro and H. Peter Anvin implemeted initramfs this way.
> Perhaps it was just a desire to make pivot_root unnecessary.

I don't think they are meant to make it this way. Unpack cpio to the
rootfs directly seems to be a normal operation. Maybe initramfs is just
ignored by pivot_root(), as it seems not a common scene to run the
whole system in RAM that time, I guess~

Thanks!
Menglong Dong