mirror of
https://github.com/wiidev/usbloadergx.git
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138 lines
2.8 KiB
C
138 lines
2.8 KiB
C
/*
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* expand.c --- expand an ext2fs directory
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*
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* Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Library
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* General Public License, version 2.
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* %End-Header%
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*/
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#include "config.h"
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#include <stdio.h>
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#include <string.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "ext2_fs.h"
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#include "ext2fs.h"
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struct expand_dir_struct {
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int done;
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int newblocks;
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blk64_t goal;
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errcode_t err;
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};
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static int expand_dir_proc(ext2_filsys fs,
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blk64_t *blocknr,
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e2_blkcnt_t blockcnt,
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blk64_t ref_block EXT2FS_ATTR((unused)),
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int ref_offset EXT2FS_ATTR((unused)),
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void *priv_data)
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{
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struct expand_dir_struct *es = (struct expand_dir_struct *) priv_data;
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blk64_t new_blk;
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char *block;
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errcode_t retval;
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if (*blocknr) {
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if (blockcnt >= 0)
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es->goal = *blocknr;
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return 0;
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}
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if (blockcnt &&
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(EXT2FS_B2C(fs, es->goal) == EXT2FS_B2C(fs, es->goal+1)))
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new_blk = es->goal+1;
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else {
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es->goal &= ~EXT2FS_CLUSTER_MASK(fs);
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retval = ext2fs_new_block2(fs, es->goal, 0, &new_blk);
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if (retval) {
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es->err = retval;
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return BLOCK_ABORT;
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}
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es->newblocks++;
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}
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if (blockcnt > 0) {
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retval = ext2fs_new_dir_block(fs, 0, 0, &block);
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if (retval) {
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es->err = retval;
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return BLOCK_ABORT;
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}
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es->done = 1;
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retval = ext2fs_write_dir_block(fs, new_blk, block);
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} else {
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retval = ext2fs_get_mem(fs->blocksize, &block);
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if (retval) {
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es->err = retval;
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return BLOCK_ABORT;
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}
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memset(block, 0, fs->blocksize);
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retval = io_channel_write_blk64(fs->io, new_blk, 1, block);
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}
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if (blockcnt >= 0)
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es->goal = new_blk;
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if (retval) {
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es->err = retval;
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return BLOCK_ABORT;
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}
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ext2fs_free_mem(&block);
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*blocknr = new_blk;
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ext2fs_block_alloc_stats2(fs, new_blk, +1);
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if (es->done)
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return (BLOCK_CHANGED | BLOCK_ABORT);
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else
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return BLOCK_CHANGED;
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}
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errcode_t ext2fs_expand_dir(ext2_filsys fs, ext2_ino_t dir)
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{
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errcode_t retval;
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struct expand_dir_struct es;
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struct ext2_inode inode;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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if (!(fs->flags & EXT2_FLAG_RW))
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return EXT2_ET_RO_FILSYS;
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if (!fs->block_map)
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return EXT2_ET_NO_BLOCK_BITMAP;
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retval = ext2fs_check_directory(fs, dir);
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if (retval)
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return retval;
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es.done = 0;
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es.err = 0;
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es.goal = 0;
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es.newblocks = 0;
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retval = ext2fs_block_iterate3(fs, dir, BLOCK_FLAG_APPEND,
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0, expand_dir_proc, &es);
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if (es.err)
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return es.err;
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if (!es.done)
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return EXT2_ET_EXPAND_DIR_ERR;
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/*
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* Update the size and block count fields in the inode.
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*/
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retval = ext2fs_read_inode(fs, dir, &inode);
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if (retval)
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return retval;
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inode.i_size += fs->blocksize;
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ext2fs_iblk_add_blocks(fs, &inode, es.newblocks);
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retval = ext2fs_write_inode(fs, dir, &inode);
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if (retval)
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return retval;
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return 0;
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}
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