linux-kernel - Re: [PATCH] init/do_mounts.c: Add root="fstag:<tag>" syntax for root device

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Date:   Wed, 9 Jun 2021 06:41:38 +0900
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Vivek Goyal <vgoyal@...hat.com>,
        Changbin Du <changbin.du@...il.com>
Cc:     linux-fsdevel@...r.kernel.org, virtio-fs@...hat.com,
        linux kernel mailing list <linux-kernel@...r.kernel.org>,
        Miklos Szeredi <miklos@...redi.hu>,
        David Howells <dhowells@...hat.com>, viro@...iv.linux.org.uk,
        stefanha@...hat.com,
        Richard Weinberger <richard.weinberger@...il.com>,
        dgilbert@...hat.com, v9fs-developer@...ts.sourceforge.net,
        Enrico Weigelt <lkml@...ux.net>
Subject: Re: [PATCH] init/do_mounts.c: Add root="fstag:<tag>" syntax for root
 device

... And that's why I told Changbin Du a few times his patches needed
more Ccs :/

FWIW: we just got last month a couple of patches that would allow
initrd-less 9p root mount (using the nfs/cifs method described below
with root=/dev/v9fs)

Vivek Goyal wrote on Tue, Jun 08, 2021 at 11:35:24AM -0400:
> NFS and CIFS use "root=/dev/nfs" and CIFS passes "root=/dev/cifs" and
> actual root device details come from filesystem specific kernel
> command line options.
> 
> virtiofs does not seem to fit in any of the above categories. In fact
> we have 9pfs which can be used to boot from but it also does not
> have a proper syntax to specify rootfs and does not fit into any of
> the existing syntax. They both expect a device "tag" to be passed
> in a device to be mounted. And filesystem knows how to parse and
> use "tag".
> 
> So this patch proposes that we add a new prefix "fstag:" which specifies
> that identifier which follows is filesystem specific tag and its not
> a block device. Just pass this tag to filesystem and filesystem will
> figure out how to mount it.


...However I agree something more generic would be welcome in my
opinion, so I like this approach.

I'll give it a try for 9p over the weekend and report back.

-- 
Dominique