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 "config.h"
9 #include <stdio.h>
10 #include <unistd.h>
11 #include <stdlib.h>
12 #include <ctype.h>
13 #include <string.h>
14 #include <time.h>
15 #ifdef HAVE_ERRNO_H
16 #include <errno.h>
17 #endif
18 #include <sys/types.h>
19 #ifdef HAVE_GETOPT_H
20 #include <getopt.h>
21 #else
22 extern int optind;
23 extern char *optarg;
24 #endif
25
26 #include "debugfs.h"
27
do_dump_unused(int argc EXT2FS_ATTR ((unused)),char ** argv)28 void do_dump_unused(int argc EXT2FS_ATTR((unused)), char **argv)
29 {
30 blk64_t blk;
31 unsigned char buf[EXT2_MAX_BLOCK_SIZE];
32 unsigned int i;
33 errcode_t retval;
34
35 if (common_args_process(argc, argv, 1, 1,
36 "dump_unused", "", 0))
37 return;
38
39 for (blk=current_fs->super->s_first_data_block;
40 blk < ext2fs_blocks_count(current_fs->super); blk++) {
41 if (ext2fs_test_block_bitmap2(current_fs->block_map,blk))
42 continue;
43 retval = io_channel_read_blk64(current_fs->io, blk, 1, buf);
44 if (retval) {
45 com_err(argv[0], retval, "While reading block\n");
46 return;
47 }
48 for (i=0; i < current_fs->blocksize; i++)
49 if (buf[i])
50 break;
51 if (i >= current_fs->blocksize)
52 continue;
53 printf("\nUnused block %llu contains non-zero data:\n\n",
54 blk);
55 for (i=0; i < current_fs->blocksize; i++)
56 fputc(buf[i], stdout);
57 }
58 }
59