debugfs/unused.c

   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
  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 }