Add compatibility function to support a single virtio-fs via the normal
'ls' and 'load' commands. Other commands are not supported for now.
Add a workaround for the fact that virtiofs does not use a block device.
The existing filesystem layer does not support non-block filesystems -
sandbox's hostfs mostly bypasses this code.
Make sure that sandbox does not try to mount a virtio-fs as this does
not work at present. It will require either a fake driver for virtio-fs
which connects to host files, or possibly something involving FUSE.
Series-to: concept
Cover-letter:
virtio: Support virtio-fs
This series introduces support for virtio-fs, a filesystem which
provides access to host files from within a QEMU guest OS.
A new filesystem driver is created with support for the three uclasses
(FS, DIR, FILE). A compatibility layer is added as well, so that the
existing cmdline work as expected.
Only listing directories and reading files are supported so far.
Since sandbox works by using a NULL blk_desc, a workaround is added for
now. Once we switch commands (and bootstd!) over to the new filesystem
approach, this will go away.
It is possible to test this using something like:
./scripts/build-qemu -a x86 -rs -D .
then within U-Boot:
ls virtio 0
END
Signed-off-by: Simon Glass <sjg@chromium.org>
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