int sys_getdents(unsigned int fd,struct linux_dirent *dirp,unsigned int count)
{
	struct buffer_head *bh;
	struct m_inode*inode=current->filp[fd]->f_inode;
	struct linux_dirent m;
	struct dir_entry *dir;
	char *buf;
	int k,n=0,i;
	if(count<=0)return -1;
	bh=bread(inode->i_dev,inode->i_zone[0]);
	for(k=0;k<inode->i_size;k+=sizeof(struct linux_dirent))
	{
		if(n+sizeof(struct linux_dirent)>count)return 0;
		dir=(struct dir_entry*)(bh->b_data+k);
		if(dir->inode)
		{
			m.d_ino=dir->inode;
			for(i=0;i<NAME_LEN;i++)m.d_name[i]=dir->name[i];
			m.d_off=0;
			m.d_reclen=sizeof(struct linux_dirent);
			buf=&m;
			for(i=0;i<m.d_reclen;i++)
			put_fs_byte(*(buf+i),(char*)(dirp)+n+i);
			n+=sizeof(struct linux_dirent);
		}
		else continue;
	}
	brelse(bh);
	return n;
}