mirror of https://github.com/vitalif/e2fsprogs
117 lines
2.3 KiB
C
117 lines
2.3 KiB
C
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/*
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* expand.c --- expand an ext2fs directory
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*
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* Copyright (C) 1993 Theodore Ts'o. This file may be redistributed
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* under the terms of the GNU Public License.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <linux/fs.h>
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#include <linux/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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errcode_t err;
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};
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static int expand_dir_proc(ext2_filsys fs,
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blk_t *blocknr,
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int blockcnt,
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void *private)
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{
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struct expand_dir_struct *es = (struct expand_dir_struct *) private;
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blk_t new_blk;
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static blk_t last_blk = 0;
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char *block;
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errcode_t retval;
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int group;
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if (*blocknr) {
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last_blk = *blocknr;
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return 0;
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}
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retval = ext2fs_new_block(fs, last_blk, 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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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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} else {
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block = malloc(fs->blocksize);
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if (!block) {
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es->err = ENOMEM;
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return BLOCK_ABORT;
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}
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memset(block, 0, fs->blocksize);
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}
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retval = io_channel_write_blk(fs->io, new_blk, 1, 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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free(block);
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*blocknr = new_blk;
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ext2fs_mark_block_bitmap(fs, fs->block_map, new_blk);
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ext2fs_mark_bb_dirty(fs);
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group = ext2fs_group_of_blk(fs, new_blk);
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fs->group_desc[group].bg_free_blocks_count--;
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fs->super->s_free_blocks_count--;
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ext2fs_mark_super_dirty(fs);
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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, 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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if (!(fs->flags & EXT2_FLAG_RW))
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return EXT2_ET_RO_FILSYS;
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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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retval = ext2fs_block_iterate(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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inode.i_blocks += fs->blocksize / 512;
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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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