linux-kernel - support booting of arbitrary non-blockdevice file systems v2

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Message-Id: <20210621062657.3641879-1-hch@lst.de>
Date:   Mon, 21 Jun 2021 08:26:55 +0200
From:   Christoph Hellwig <hch@....de>
To:     viro@...iv.linux.org.uk
Cc:     Vivek Goyal <vgoyal@...hat.com>, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, virtio-fs@...hat.com
Subject: support booting of arbitrary non-blockdevice file systems v2

Hi all,

this series adds support to boot off arbitrary non-blockdevice root file
systems, based off an earlier patch from Vivek.

Chances since v1:
 - don't try to mount every registered file system if none is specified
 - fix various null pointer dereferences when certain kernel paramters are
   not set
 - general refactoring.