linux-kernel - Re: [PATCH v4 2/3] init/do_mounts.c: create second mount for initramfs

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Date:   Fri, 4 Jun 2021 11:59:01 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Menglong Dong <menglong8.dong@...il.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Kees Cook <keescook@...omium.org>,
        Sami Tolvanen <samitolvanen@...gle.com>, johan@...nel.org,
        ojeda@...nel.org, Andrew Morton <akpm@...ux-foundation.org>,
        Menglong Dong <dong.menglong@....com.cn>, masahiroy@...nel.org,
        joe@...ches.com, hare@...e.de, Jens Axboe <axboe@...nel.dk>,
        Jan Kara <jack@...e.cz>, tj@...nel.org,
        gregkh@...uxfoundation.org, song@...nel.org,
        NeilBrown <neilb@...e.de>, Barret Rhoden <brho@...gle.com>,
        Luis Chamberlain <mcgrof@...nel.org>, palmerdabbelt@...gle.com,
        arnd@...db.de, f.fainelli@...il.com,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        wangkefeng.wang@...wei.com, Masami Hiramatsu <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>, vbabka@...e.cz,
        pmladek@...e.com, Alexander Potapenko <glider@...gle.com>,
        Chris Down <chris@...isdown.name>,
        "Eric W. Biederman" <ebiederm@...ssion.com>, jojing64@...il.com,
        mingo@...nel.org, terrelln@...com, geert@...ux-m68k.org,
        linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        jeyu@...nel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        Josh Triplett <josh@...htriplett.org>
Subject: Re: [PATCH v4 2/3] init/do_mounts.c: create second mount for
 initramfs

On Thu, Jun 03, 2021 at 11:05:08PM +0800, Menglong Dong wrote:
> On Thu, Jun 3, 2021 at 9:30 PM Christian Brauner
> <christian.brauner@...ntu.com> wrote:
> >
> [...]
> >
> > In fact you seem to be only using this struct you're introducing in this
> > single place which makes me think that it's not needed at all. So what's
> > preventing us from doing:
> >
> > > +
> > > +     return do_mount_root(root->dev_name,
> > > +                          root->fs_name,
> > > +                          root_mountflags & ~MS_RDONLY,
> > > +                          root_mount_data);
> > > +}
> >
> > int __init prepare_mount_rootfs(void)
> > {
> >         if (is_tmpfs_enabled())
> >                 return do_mount_root("tmpfs", "tmpfs",
> >                                      root_mountflags & ~MS_RDONLY,
> >                                      root_mount_data);
> >
> >         return do_mount_root("ramfs", "ramfs",
> >                              root_mountflags & ~MS_RDONLY,
> >                              root_mount_data);
> > }
> 
> It seems to make sense, but I just feel that it is a little hardcode.
> What if a new file system
> of rootfs arises? Am I too sensitive?

It'sn understandable but premature worry and I don't think it should
justify all that extra code.

Christian