rem: err = EINVAL;
add: err = FS_EINVAL;
context: rootfs_readlink(void *_ns, void *_node, char *buf, size_t *bufsize){    nspace      *ns;    vnode       *node;    int         err;    size_t      l;    ns = (nspace *) _ns;    node = (vnode *) _node;    if (!MY_S_ISLNK(node->mode)) {        err = EINVAL;        goto error1;    }    l = strlen(node->symlink);    if (l > *bufsize)        memcpy(buf, node->symlink, *bufsize);    else        memcpy(buf, node->symlink, l);    *bufsize = l;    return 0;error1:    return err;}