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

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Message-ID: <YMHOXn2cpGh1T9vz@codewreck.org>
Date:   Thu, 10 Jun 2021 17:33:34 +0900
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Stefan Hajnoczi <stefanha@...hat.com>
Cc:     Vivek Goyal <vgoyal@...hat.com>, 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,
        Richard Weinberger <richard.weinberger@...il.com>,
        dgilbert@...hat.com, v9fs-developer@...ts.sourceforge.net,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH] init/do_mounts.c: Add root="fstag:<tag>" syntax for root
 device

Stefan Hajnoczi wrote on Thu, Jun 10, 2021 at 09:16:38AM +0100:
> virtio-9p should be simple. I'm not sure how much additional setup the
> other 9p transports require. TCP and RDMA seem doable if there are
> kernel parameters to configure things before the root file system is
> mounted.

For TCP, we can probably piggyback on what nfs does for this, see the
ip= parameter in Documentation/admin-guide/nfs/nfsroot.rst -- it lives
in net/ipv4/ipconfig.c so should just work out of the box

For RDMA I'm less optimistic, technically if we can setup ipoib with an
ip with the same parameter it should work, but I have nothing to test it
on anyway so that'll wait until someone who cares actually does try...


Either way, we've got to start somewhere, so it's good there's something :)
-- 
Dominique