linux-kernel - Re: [PATCH v3 2/3] init: allow mounting arbitrary non-blockdevice filesystems as root

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Message-ID: <YPAIL1FJk6mzGXBQ@stefanha-x1.localdomain>
Date:   Thu, 15 Jul 2021 11:04:31 +0100
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     Vivek Goyal <vgoyal@...hat.com>
Cc:     viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, hch@....de, virtio-fs@...hat.com,
        v9fs-developer@...ts.sourceforge.net, miklos@...redi.hu
Subject: Re: [PATCH v3 2/3] init: allow mounting arbitrary non-blockdevice
 filesystems as root

On Wed, Jul 14, 2021 at 04:23:20PM -0400, Vivek Goyal wrote:
> From: Christoph Hellwig <hch@....de>
> 
> Currently the only non-blockdevice filesystems that can be used as the
> initial root filesystem are NFS and CIFS, which use the magic
> "root=/dev/nfs" and "root=/dev/cifs" syntax that requires the root
> device file system details to come from filesystem specific kernel
> command line options.
> 
> Add a little bit of new code that allows to just pass arbitrary
> string mount options to any non-blockdevice filesystems so that it can
> be mounted as the root file system.
> 
> For example a virtiofs root file system can be mounted using the
> following syntax:
> 
> "root=myfs rootfstype=virtiofs rw"
> 
> Based on an earlier patch from Vivek Goyal <vgoyal@...hat.com>.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  init/do_mounts.c | 43 +++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 43 insertions(+)

Reviewed-by: Stefan Hajnoczi <stefanha@...hat.com>

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