[Virtio-fs] [PATCH] init/do_mounts.c: add virtio_fs root fs support
Dr. David Alan Gilbert
dgilbert at redhat.com
Wed Jul 31 10:34:08 UTC 2019
* Stefan Hajnoczi (stefanha at redhat.com) wrote:
> It is useful to mount the root file system via virtio_fs. During
> testing a monolithic kernel is more convenient than an initramfs but
> we'll need to teach the kernel how to boot directly from virtio_fs.
>
> Signed-off-by: Stefan Hajnoczi <stefanha at redhat.com>
> ---
> init/do_mounts.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/init/do_mounts.c b/init/do_mounts.c
> index f8c230c77035..b2d9650488d7 100644
> --- a/init/do_mounts.c
> +++ b/init/do_mounts.c
> @@ -553,6 +553,16 @@ void __init mount_root(void)
> change_floppy("root floppy");
> }
> #endif
> +#ifdef CONFIG_VIRTIO_FS
> + if (root_fs_names && !strcmp(root_fs_names, "virtio_fs")) {
> + if (!do_mount_root(root_device_name, "virtio_fs",
> + root_mountflags, root_mount_data))
> + return;
> +
> + panic("VFS: Unable to mount root fs \"%s\" from virtio_fs",
> + root_device_name);
> + }
> +#endif
I wonder if it's possible to make this more generic; I see that
filesystems have a flag, FS_REQUIRES_DEV - should this
work for most filesystems that don't have that set?
Dave
> #ifdef CONFIG_BLOCK
> {
> int err = create_dev("/dev/root", ROOT_DEV);
> --
> 2.21.0
>
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--
Dr. David Alan Gilbert / dgilbert at redhat.com / Manchester, UK
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