vfs_makefsops
error = vfs_makefsops(door_vfsops_template, &door_vfsops);
(void) vfs_makefsops(fshead_vfs_spec, &fi->head.fn_op.vfs);
error = vfs_makefsops(nm_dummy_vfsops_template, &dummy_vfsops);
error = vfs_makefsops(port_vfsops_template, &port_vfsops);
error = vfs_makefsops(EIO_vfsops_template, &EIO_vfsops);
int vfs_makefsops(const fs_operation_def_t *, vfsops_t **);