rem: return ENODEV;
add: return FS_ENODEV;
context: add_nspace(nspace *ns, fsystem *fs, const char *fileSystem, dev_t dev, ino_t ino){	int i;	if (fileSystem != NULL)		fs = inc_file_system(fileSystem);	if (!fs)		return ENODEV;	for (i = 0; i < nns; i++, nxnsid++) {		if (!nstab[nxnsid % nns]) {			nstab[nxnsid % nns] = ns;			ns->nsid = nxnsid;			nxnsid++;			break;		}	}	if (i == nns) {		dec_file_system(fs);		return EMFILE;	}	nstab[ns->nsid % nns] = ns;	ns->fs = fs;	ns->vnodes.head = ns->vnodes.tail = NULL;	ns->data = NULL;	ns->root = NULL;	ns->mount = NULL;	ns->prev = NULL;	ns->next = nshead;	ns->shutdown = FALSE;	ns->dev = dev;	ns->ino = ino;	if (nshead)		nshead->prev = ns;	nshead = ns;	return B_OK;}