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
21 extern int optind;
22 extern char *optarg;
23 #endif
24
25 #include "debugfs.h"
26
do_dump_unused(int argc EXT2FS_ATTR ((unused)),char ** argv)27 void do_dump_unused(int argc EXT2FS_ATTR((unused)), char **argv)
28 {
29 unsigned long 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 < current_fs->super->s_blocks_count; blk++) {
40 if (ext2fs_test_block_bitmap(current_fs->block_map,blk))
41 continue;
42 retval = io_channel_read_blk(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 %lu 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