/* vi: set sw=4 ts=4: *//* * expand.c --- expand an ext2fs directory * * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999  Theodore Ts'o. * * %Begin-Header% * This file may be redistributed under the terms of the GNU Public * License. * %End-Header% */#include <stdio.h>#include <string.h>#if HAVE_UNISTD_H#include <unistd.h>#endif#include "ext2_fs.h"#include "ext2fs.h"struct expand_dir_struct {	int		done;	int		newblocks;	errcode_t	err;};static int expand_dir_proc(ext2_filsys	fs,			   blk_t	*blocknr,			   e2_blkcnt_t	blockcnt,			   blk_t	ref_block EXT2FS_ATTR((unused)),			   int		ref_offset EXT2FS_ATTR((unused)),			   void		*priv_data){	struct expand_dir_struct *es = (struct expand_dir_struct *) priv_data;	blk_t	new_blk;	static blk_t	last_blk = 0;	char		*block;	errcode_t	retval;	if (*blocknr) {		last_blk = *blocknr;		return 0;	}	retval = ext2fs_new_block(fs, last_blk, 0, &new_blk);	if (retval) {		es->err = retval;		return BLOCK_ABORT;	}	if (blockcnt > 0) {		retval = ext2fs_new_dir_block(fs, 0, 0, &block);		if (retval) {			es->err = retval;			return BLOCK_ABORT;		}		es->done = 1;		retval = ext2fs_write_dir_block(fs, new_blk, block);	} else {		retval = ext2fs_get_mem(fs->blocksize, &block);		if (retval) {			es->err = retval;			return BLOCK_ABORT;		}		memset(block, 0, fs->blocksize);		retval = io_channel_write_blk(fs->io, new_blk, 1, block);	}	if (retval) {		es->err = retval;		return BLOCK_ABORT;	}	ext2fs_free_mem(&block);	*blocknr = new_blk;	ext2fs_block_alloc_stats(fs, new_blk, +1);	es->newblocks++;	if (es->done)		return (BLOCK_CHANGED | BLOCK_ABORT);	else		return BLOCK_CHANGED;}errcode_t ext2fs_expand_dir(ext2_filsys fs, ext2_ino_t dir){	errcode_t	retval;	struct expand_dir_struct es;	struct ext2_inode	inode;	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);	if (!(fs->flags & EXT2_FLAG_RW))		return EXT2_ET_RO_FILSYS;	if (!fs->block_map)		return EXT2_ET_NO_BLOCK_BITMAP;	retval = ext2fs_check_directory(fs, dir);	if (retval)		return retval;	es.done = 0;	es.err = 0;	es.newblocks = 0;	retval = ext2fs_block_iterate2(fs, dir, BLOCK_FLAG_APPEND,				       0, expand_dir_proc, &es);	if (es.err)		return es.err;	if (!es.done)		return EXT2_ET_EXPAND_DIR_ERR;	/*	 * Update the size and block count fields in the inode.	 */	retval = ext2fs_read_inode(fs, dir, &inode);	if (retval)		return retval;	inode.i_size += fs->blocksize;	inode.i_blocks += (fs->blocksize / 512) * es.newblocks;	retval = ext2fs_write_inode(fs, dir, &inode);	if (retval)		return retval;	return 0;}