Re: [PATCH 00/30] virtiofs daemon (base)

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Oct 21, 2019 at 11:58:02AM +0100, Dr. David Alan Gilbert (git) wrote:
> From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
> 
> Hi,
>   This is the 1st set for the virtiofsd - a daemon
> that implements the user space side of virtiofs.
> 
>   The kernel and qemu device parts recently went in,
> so the daemon is the only thing missing to have a working
> set.
> 
>   This set is the absolute minimal base set of patches;
> it's not yet safe to use (from security or correctness);
> 
> I'll follow up with ~3 more series in the next few days
> with:
> 
>     a) Security patches that add sandboxing and checking
>        compared with normal fuse - that makes it safe.
>     b) Performance improvements including threading
>     c) Other fixes, including correctness.
> 
> but, this is a good start and gets things rolling.
> 
> The set pulls in a big chunk of the upstream libfuse library
> (unmodified so that it's easy to check it really is upstream),
> chops all the stuff out we don't need and then adds the
> new transport we need.
> 
> For new files I've formatted the code according to qemu
> standards; for files that are from upstream libfuse
> I've kept with their standards for ease of future updating.

Thinking of future updates, have you given any thought to
automating them? Something along the lines of
update-linux-headers maybe?


> We can't just link with libfuse, since we have to make ABI incompatible
> changes for the new transport.
> 
> Running this daemon is typically done with:
> 
>    ./virtiofsd -o vhost_user_socket=/path/socket -o source=/path/to/fs
> 
> connected to a qemu that's then started with:
>    -chardev socket,id=char0,path=/path/socket -device vhost-user-fs-pci,queue-size=1024,chardev=char0,tag=myfs
> 
> and then in the guest mount with:
>    mount -t virtiofs myfs /mnt
> 
> Our development branch is: https://gitlab.com/virtio-fs/qemu/tree/virtio-fs-dev
> 
> Dave
> 
> 
> Dr. David Alan Gilbert (22):
>   virtiofsd: Pull in upstream headers
>   virtiofsd: Pull in kernel's fuse.h
>   virtiofsd: Add auxiliary .c's
>   virtiofsd: Add fuse_lowlevel.c
>   virtiofsd: Add passthrough_ll
>   virtiofsd: Trim down imported files
>   virtiofsd: Fix fuse_daemonize ignored return values
>   virtiofsd: Fix common header and define for QEMU builds
>   virtiofsd: fuse: Make iov_length usable outside fuse_lowlevel.c
>   virtiofsd: Add options for virtio
>   virtiofsd: Open vhost connection instead of mounting
>   virtiofsd: Start wiring up vhost-user
>   virtiofsd: Add main virtio loop
>   virtiofsd: get/set features callbacks
>   virtiofsd: Start queue threads
>   virtiofsd: Poll kick_fd for queue
>   virtiofsd: Start reading commands from queue
>   virtiofsd: Send replies to messages
>   virtiofsd: Keep track of replies
>   virtiofsd: Add Makefile wiring for virtiofsd contrib
>   virtiofsd: Fast path for virtio read
>   virtiofs: Add maintainers entry
> 
> Stefan Hajnoczi (7):
>   virtiofsd: remove mountpoint dummy argument
>   virtiofsd: remove unused notify reply support
>   virtiofsd: add -o source=PATH to help output
>   virtiofsd: add --fd=FDNUM fd passing option
>   virtiofsd: make -f (foreground) the default
>   virtiofsd: add vhost-user.json file
>   virtiofsd: add --print-capabilities option
> 
> Vivek Goyal (1):
>   virtiofsd: Make fsync work even if only inode is passed in
> 
>  .gitignore                                  |    1 +
>  MAINTAINERS                                 |    8 +
>  Makefile                                    |    9 +
>  Makefile.objs                               |    1 +
>  contrib/virtiofsd/50-qemu-virtiofsd.json.in |    5 +
>  contrib/virtiofsd/Makefile.objs             |   10 +
>  contrib/virtiofsd/buffer.c                  |  318 +++
>  contrib/virtiofsd/fuse.h                    | 1268 ++++++++++
>  contrib/virtiofsd/fuse_common.h             |  823 +++++++
>  contrib/virtiofsd/fuse_i.h                  |  131 ++
>  contrib/virtiofsd/fuse_kernel.h             |  858 +++++++
>  contrib/virtiofsd/fuse_log.c                |   40 +
>  contrib/virtiofsd/fuse_log.h                |   82 +
>  contrib/virtiofsd/fuse_loop_mt.c            |   54 +
>  contrib/virtiofsd/fuse_lowlevel.c           | 2302 +++++++++++++++++++
>  contrib/virtiofsd/fuse_lowlevel.h           | 2024 ++++++++++++++++
>  contrib/virtiofsd/fuse_misc.h               |   59 +
>  contrib/virtiofsd/fuse_opt.c                |  422 ++++
>  contrib/virtiofsd/fuse_opt.h                |  271 +++
>  contrib/virtiofsd/fuse_signals.c            |   90 +
>  contrib/virtiofsd/fuse_virtio.c             |  717 ++++++
>  contrib/virtiofsd/fuse_virtio.h             |   33 +
>  contrib/virtiofsd/helper.c                  |  300 +++
>  contrib/virtiofsd/passthrough_helpers.h     |   76 +
>  contrib/virtiofsd/passthrough_ll.c          | 1341 +++++++++++
>  docs/interop/vhost-user.json                |    4 +-
>  26 files changed, 11246 insertions(+), 1 deletion(-)
>  create mode 100644 contrib/virtiofsd/50-qemu-virtiofsd.json.in
>  create mode 100644 contrib/virtiofsd/Makefile.objs
>  create mode 100644 contrib/virtiofsd/buffer.c
>  create mode 100644 contrib/virtiofsd/fuse.h
>  create mode 100644 contrib/virtiofsd/fuse_common.h
>  create mode 100644 contrib/virtiofsd/fuse_i.h
>  create mode 100644 contrib/virtiofsd/fuse_kernel.h
>  create mode 100644 contrib/virtiofsd/fuse_log.c
>  create mode 100644 contrib/virtiofsd/fuse_log.h
>  create mode 100644 contrib/virtiofsd/fuse_loop_mt.c
>  create mode 100644 contrib/virtiofsd/fuse_lowlevel.c
>  create mode 100644 contrib/virtiofsd/fuse_lowlevel.h
>  create mode 100644 contrib/virtiofsd/fuse_misc.h
>  create mode 100644 contrib/virtiofsd/fuse_opt.c
>  create mode 100644 contrib/virtiofsd/fuse_opt.h
>  create mode 100644 contrib/virtiofsd/fuse_signals.c
>  create mode 100644 contrib/virtiofsd/fuse_virtio.c
>  create mode 100644 contrib/virtiofsd/fuse_virtio.h
>  create mode 100644 contrib/virtiofsd/helper.c
>  create mode 100644 contrib/virtiofsd/passthrough_helpers.h
>  create mode 100644 contrib/virtiofsd/passthrough_ll.c
> 
> -- 
> 2.23.0