1/*
2 * unused.c --- quick and dirty unused space dumper
3 *
4 * Copyright (C) 1997 Theodore Ts'o.  This file may be redistributed
5 * under the terms of the GNU Public License.
6 */
7
8#include <stdio.h>
9#include <unistd.h>
10#include <stdlib.h>
11#include <ctype.h>
12#include <string.h>
13#include <time.h>
14#ifdef HAVE_ERRNO_H
15#include <errno.h>
16#endif
17#include <sys/types.h>
18#ifdef HAVE_GETOPT_H
19#include <getopt.h>
20#else
21extern int optind;
22extern char *optarg;
23#endif
24
25#include "debugfs.h"
26
27void do_dump_unused(int argc EXT2FS_ATTR((unused)), char **argv)
28{
29	blk64_t		blk;
30	unsigned char	buf[EXT2_MAX_BLOCK_SIZE];
31	unsigned int	i;
32	errcode_t	retval;
33
34	if (common_args_process(argc, argv, 1, 1,
35				"dump_unused", "", 0))
36		return;
37
38	for (blk=current_fs->super->s_first_data_block;
39	     blk < ext2fs_blocks_count(current_fs->super); blk++) {
40		if (ext2fs_test_block_bitmap2(current_fs->block_map,blk))
41			continue;
42		retval = io_channel_read_blk64(current_fs->io, blk, 1, buf);
43		if (retval) {
44			com_err(argv[0], retval, "While reading block\n");
45			return;
46		}
47		for (i=0; i < current_fs->blocksize; i++)
48			if (buf[i])
49				break;
50		if (i >= current_fs->blocksize)
51			continue;
52		printf("\nUnused block %llu contains non-zero data:\n\n",
53		       blk);
54		for (i=0; i < current_fs->blocksize; i++)
55			fputc(buf[i], stdout);
56	}
57}
58