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virtio fs tunnels fuse over a virtio channel. One issue is two sides might be speaking different endian-ness. To detects this, host side looks at the opcode value in the FUSE_INIT command. Works fine at the moment but might fail if a future version of fuse will use such an opcode for initialization. Let's reserve this opcode so we remember and don't do this. Same for CUSE_INIT. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>