init/do_mounts.c: add virtiofs root fs support

Make it possible to boot directly from a virtiofs file system with tag
'myfs' using the following kernel parameters:

  rootfstype=virtiofs root=myfs rw

Booting directly from virtiofs makes it possible to use a directory on
the host as the root file system.  This is convenient for testing and
situations where manipulating disk image files is cumbersome.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

init/do_mounts.c

@@ -552,6 +552,16 @@ void __init mount_root(void)
 		return;
 	}
 #endif
+#ifdef CONFIG_VIRTIO_FS
+	if (root_fs_names && !strcmp(root_fs_names, "virtiofs")) {
+		if (!do_mount_root(root_device_name, "virtiofs",
+				   root_mountflags, root_mount_data))
+			return;
+
+		panic("VFS: Unable to mount root fs \"%s\" from virtiofs",
+		      root_device_name);
+	}
+#endif
 #ifdef CONFIG_BLOCK
 	{
 		int err = create_dev("/dev/root", ROOT_DEV);