linux-kernel - [PATCH v2 0/3] 9p: add support for root file systems

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Message-Id: <20210507235842.16796-1-changbin.du@gmail.com>
Date:   Sat,  8 May 2021 07:58:39 +0800
From:   Changbin Du <changbin.du@...il.com>
To:     Eric Van Hensbergen <ericvh@...il.com>,
        Latchesar Ionkov <lucho@...kov.net>,
        Dominique Martinet <asmadeus@...ewreck.org>
Cc:     Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, v9fs-developer@...ts.sourceforge.net,
        "Enrico Weigelt, metux IT consult" <lkml@...ux.net>,
        Changbin Du <changbin.du@...il.com>
Subject: [PATCH v2 0/3] 9p: add support for root file systems

Just like cifs and nfs, this short series enables rootfs support for 9p.
Bellow is an example which mounts v9fs with tag 'r' as rootfs in qemu
guest via virtio transport.

  $ qemu-system-x86_64 -enable-kvm -cpu host -m 1024 \
        -virtfs local,path=$rootfs_dir,mount_tag=r,security_model=passthrough,id=r \
        -kernel /path/to/linux/arch/x86/boot/bzImage -nographic \
        -append "root=/dev/v9fs v9fsroot=r,trans=virtio rw console=ttyS0 3"

v2:
  o use pr_err instead of printk.
  o ROOT_DEV is only set after checking.
  o cleanup DEFAULT_MNT_OPTS.
  o do not retry mount for fd and virtio transport.

Changbin Du (3):
  9p: add support for root file systems
  9p: doc: move to a new dedicated folder
  9p: doc: add v9fsroot description

 Documentation/filesystems/index.rst         |  2 +-
 Documentation/filesystems/{ => v9fs}/9p.rst |  0
 Documentation/filesystems/v9fs/index.rst    | 12 ++++
 Documentation/filesystems/v9fs/v9fsroot.rst | 52 +++++++++++++++++
 MAINTAINERS                                 |  8 ++-
 fs/9p/Kconfig                               |  6 ++
 fs/9p/Makefile                              |  1 +
 fs/9p/v9fsroot.c                            | 64 +++++++++++++++++++++
 include/linux/root_dev.h                    |  1 +
 init/do_mounts.c                            | 54 +++++++++++++++++
 10 files changed, 198 insertions(+), 2 deletions(-)
 rename Documentation/filesystems/{ => v9fs}/9p.rst (100%)
 create mode 100644 Documentation/filesystems/v9fs/index.rst
 create mode 100644 Documentation/filesystems/v9fs/v9fsroot.rst
 create mode 100644 fs/9p/v9fsroot.c

-- 
2.30.2