DQUOT_OFF(s);
void deactivate_super(struct super_block *s){	struct file_system_type *fs = s->s_type;	if (atomic_dec_and_lock(&s->s_active, &sb_lock)) {		s->s_count -= S_BIAS-1;		spin_unlock(&sb_lock);		down_write(&s->s_umount);		fs->kill_sb(s);		put_filesystem(fs);		put_super(s);	}}