misc/dumpe2fs.c

   1 /*
   2  * dumpe2fs.c           - List the control structures of a second
   3  *                        extended filesystem
   4  *
   5  * Copyright (C) 1992, 1993, 1994  Remy Card <card@masi.ibp.fr>
   6  *                                 Laboratoire MASI, Institut Blaise Pascal
   7  *                                 Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  * Copyright 1995, 1996, 1997 by Theodore Ts'o.
  10  *
  11  * %Begin-Header%
  12  * This file may be redistributed under the terms of the GNU Public
  13  * License.
  14  * %End-Header%
  15  */
  16
  17 /*
  18  * History:
  19  * 94/01/09     - Creation
  20  * 94/02/27     - Ported to use the ext2fs library
  21  */
  22
  23 #ifdef HAVE_GETOPT_H
  24 #include <getopt.h>
  25 #else
  26 extern char *optarg;
  27 extern int optind;
  28 #endif
  29 #include <fcntl.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <unistd.h>
  34
  35 #include <linux/ext2_fs.h>
  36
  37 #include "ext2fs/ext2fs.h"
  38 #include "e2p/e2p.h"
  39
  40 #include "../version.h"
  41 #include "nls-enable.h"
  42
  43 #define in_use(m, x)    (ext2fs_test_bit ((x), (m)))
  44
  45 const char * program_name = "dumpe2fs";
  46 char * device_name = NULL;
  47 int opt_hex = 0;
  48
  49 static void usage(void)
  50 {
  51         fprintf (stderr, _("Usage: %s [-bfhxV] [-ob superblock] "
  52                  "[-oB blocksize] device\n"), program_name);
  53         exit (1);
  54 }
  55
  56 static void print_free (unsigned long group, char * bitmap,
  57                         unsigned long nbytes, unsigned long offset)
  58 {
  59         int p = 0;
  60         unsigned long i;
  61         unsigned long j;
  62
  63         for (i = 0; i < nbytes; i++)
  64                 if (!in_use (bitmap, i))
  65                 {
  66                         if (p)
  67                                 printf (", ");
  68                         if (i == nbytes - 1 || in_use (bitmap, i + 1))
  69                                 printf (opt_hex ? "0x%04x" : "%lu",
  70                                         group * nbytes + i + offset);
  71                         else
  72                         {
  73                                 for (j = i; j < nbytes && !in_use (bitmap, j);
  74                                      j++)
  75                                         ;
  76                                 printf (opt_hex ? "0x%04lx-0x%04lx" :
  77                                         "%lu-%lu", group * nbytes + i + offset,
  78                                         group * nbytes + (j - 1) + offset);
  79                                 i = j - 1;
  80                         }
  81                         p = 1;
  82                 }
  83 }
  84
  85 static void list_desc (ext2_filsys fs)
  86 {
  87         unsigned long i;
  88         blk_t   group_blk, next_blk;
  89         char * block_bitmap = fs->block_map->bitmap;
  90         char * inode_bitmap = fs->inode_map->bitmap;
  91         int inode_blocks_per_group;
  92         int group_desc_blocks;
  93
  94         inode_blocks_per_group = ((fs->super->s_inodes_per_group *
  95                                    EXT2_INODE_SIZE(fs->super)) +
  96                                   EXT2_BLOCK_SIZE(fs->super) - 1) /
  97                                  EXT2_BLOCK_SIZE(fs->super);
  98         group_desc_blocks = ((fs->super->s_blocks_count -
  99                               fs->super->s_first_data_block +
 100                               EXT2_BLOCKS_PER_GROUP(fs->super) - 1) /
 101                              EXT2_BLOCKS_PER_GROUP(fs->super) +
 102                              EXT2_DESC_PER_BLOCK(fs->super) - 1) /
 103                             EXT2_DESC_PER_BLOCK(fs->super);
 104
 105         printf ("\n");
 106         group_blk = fs->super->s_first_data_block;
 107         for (i = 0; i < fs->group_desc_count; i++) {
 108                 next_blk = group_blk + fs->super->s_blocks_per_group;
 109                 if (next_blk > fs->super->s_blocks_count)
 110                         next_blk = fs->super->s_blocks_count;
 111                 printf (opt_hex ? _("Group %lu: (Blocks %04x -- %04x)\n"):
 112                          _("Group %lu: (Blocks %u -- %u)\n"), i,
 113                         group_blk, next_blk -1 );
 114                 if (ext2fs_bg_has_super (fs, i))
 115                         printf (opt_hex ? _("  %s Superblock at 0x%04x,"
 116                                 "  Group Descriptors at 0x%04x-0x%04x\n"):
 117                                 _("  %s Superblock at %u,"
 118                                 "  Group Descriptors at %u-%u\n"),
 119                                 i == 0 ? _("Primary") : _("Backup"),
 120                                 group_blk, group_blk + 1,
 121                                 group_blk + group_desc_blocks);
 122                 printf (opt_hex ? _("  Block bitmap at %04x (+%d), "
 123                         "Inode bitmap at %04x (+%d)\n  "
 124                         "Inode table at %04x-%04x (+%d)\n"):
 125                         _("  Block bitmap at %u (+%d), "
 126                         "Inode bitmap at %u (+%d)\n  "
 127                         "Inode table at %u-%u (+%d)\n"),
 128                         fs->group_desc[i].bg_block_bitmap,
 129                         fs->group_desc[i].bg_block_bitmap - group_blk,
 130                         fs->group_desc[i].bg_inode_bitmap,
 131                         fs->group_desc[i].bg_inode_bitmap - group_blk,
 132                         fs->group_desc[i].bg_inode_table,
 133                         fs->group_desc[i].bg_inode_table +
 134                                 inode_blocks_per_group,
 135                         fs->group_desc[i].bg_inode_table - group_blk);
 136                 printf (_("  %d free blocks, %d free inodes, %d directories\n"),
 137                         fs->group_desc[i].bg_free_blocks_count,
 138                         fs->group_desc[i].bg_free_inodes_count,
 139                         fs->group_desc[i].bg_used_dirs_count);
 140                 printf (_("  Free blocks: "));
 141                 print_free (i, block_bitmap, fs->super->s_blocks_per_group,
 142                             fs->super->s_first_data_block);
 143                 block_bitmap += fs->super->s_blocks_per_group / 8;
 144                 printf ("\n");
 145                 printf (_("  Free inodes: "));
 146                 print_free (i, inode_bitmap, fs->super->s_inodes_per_group, 1);
 147                 inode_bitmap += fs->super->s_inodes_per_group / 8;
 148                 printf ("\n");
 149                 group_blk = next_blk;
 150         }
 151 }
 152
 153 static void list_bad_blocks(ext2_filsys fs)
 154 {
 155         badblocks_list          bb_list = 0;
 156         badblocks_iterate       bb_iter;
 157         blk_t                   blk;
 158         errcode_t               retval;
 159
 160         retval = ext2fs_read_bb_inode(fs, &bb_list);
 161         if (retval) {
 162                 com_err("ext2fs_read_bb_inode", retval, "");
 163                 exit(1);
 164         }
 165         retval = badblocks_list_iterate_begin(bb_list, &bb_iter);
 166         if (retval) {
 167                 com_err("badblocks_list_iterate_begin", retval,
 168                         _("while printing bad block list"));
 169                 exit(1);
 170         }
 171         if (badblocks_list_iterate(bb_iter, &blk))
 172                 printf(_("Bad blocks: %d"), blk);
 173         while (badblocks_list_iterate(bb_iter, &blk))
 174                 printf(", %d", blk);
 175         badblocks_list_iterate_end(bb_iter);
 176         printf("\n");
 177 }
 178
 179 static void dump_bad_blocks(ext2_filsys fs)
 180 {
 181         badblocks_list          bb_list = 0;
 182         badblocks_iterate       bb_iter;
 183         blk_t                   blk;
 184         errcode_t               retval;
 185
 186         retval = ext2fs_read_bb_inode(fs, &bb_list);
 187         if (retval) {
 188                 com_err("ext2fs_read_bb_inode", retval, "");
 189                 exit(1);
 190         }
 191         retval = badblocks_list_iterate_begin(bb_list, &bb_iter);
 192         if (retval) {
 193                 com_err("badblocks_list_iterate_begin", retval,
 194                         _("while printing bad block list"));
 195                 exit(1);
 196         }
 197         while (badblocks_list_iterate(bb_iter, &blk))
 198                 printf("%d\n", blk);
 199         badblocks_list_iterate_end(bb_iter);
 200 }
 201
 202 static int i386_byteorder(void)
 203 {
 204         int one = 1;
 205         char *cp = (char *) &one;
 206
 207         return (*cp == 1);
 208 }
 209
 210 int main (int argc, char ** argv)
 211 {
 212         errcode_t       retval;
 213         ext2_filsys     fs;
 214         int             print_badblocks = 0;
 215         int             use_superblock = 0;
 216         int             use_blocksize = 0;
 217         int             force = 0;
 218         int             header_only = 0;
 219         int             big_endian;
 220         int             c;
 221
 222 #ifdef ENABLE_NLS
 223         setlocale(LC_MESSAGES, "");
 224         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
 225         textdomain(NLS_CAT_NAME);
 226 #endif
 227         initialize_ext2_error_table();
 228         fprintf (stderr, _("dumpe2fs %s, %s for EXT2 FS %s, %s\n"),
 229                  E2FSPROGS_VERSION, E2FSPROGS_DATE,
 230                  EXT2FS_VERSION, EXT2FS_DATE);
 231         if (argc && *argv)
 232                 program_name = *argv;
 233
 234         while ((c = getopt (argc, argv, "bfhxVo:")) != EOF) {
 235                 switch (c) {
 236                 case 'b':
 237                         print_badblocks++;
 238                         break;
 239                 case 'f':
 240                         force++;
 241                         break;
 242                 case 'h':
 243                         header_only++;
 244                         break;
 245                 case 'o':
 246                         if (optarg[0] == 'b')
 247                                 use_superblock = atoi(optarg+1);
 248                         else if (optarg[0] == 'B')
 249                                 use_blocksize = atoi(optarg+1);
 250                         else
 251                                 usage();
 252                         break;
 253                 case 'V':
 254                         /* Print version number and exit */
 255                         fprintf(stderr, _("\tUsing %s\n"),
 256                                 error_message(EXT2_ET_BASE));
 257                         exit(0);
 258                 case 'x':
 259                         opt_hex=1;
 260                         break;
 261                 default:
 262                         usage();
 263                 }
 264         }
 265         if (optind > argc - 1)
 266                 usage();
 267         device_name = argv[optind++];
 268         if (use_superblock && !use_blocksize)
 269                 use_blocksize = 1024;
 270         retval = ext2fs_open (device_name, force ? EXT2_FLAG_FORCE : 0,
 271                               use_superblock, use_blocksize,
 272                               unix_io_manager, &fs);
 273         if (retval) {
 274                 com_err (program_name, retval, _("while trying to open %s"),
 275                          device_name);
 276                 printf (_("Couldn't find valid filesystem superblock.\n"));
 277                 exit (1);
 278         }
 279         if (print_badblocks) {
 280                 dump_bad_blocks(fs);
 281         } else {
 282                 big_endian = ((fs->flags & EXT2_FLAG_SWAP_BYTES) != 0);
 283                 if (!i386_byteorder())
 284                         big_endian = !big_endian;
 285                 if (big_endian)
 286                         printf(_("Note: This is a byte-swapped filesystem\n"));
 287                 list_super (fs->super);
 288                 list_bad_blocks (fs);
 289                 if (header_only) {
 290                         ext2fs_close (fs);
 291                         exit (0);
 292                 }
 293                 retval = ext2fs_read_bitmaps (fs);
 294                 if (retval) {
 295                         com_err (program_name, retval,
 296                                  _("while trying to read the bitmaps"),
 297                                  device_name);
 298                         ext2fs_close (fs);
 299                         exit (1);
 300                 }
 301                 list_desc (fs);
 302         }
 303         ext2fs_close (fs);
 304         exit (0);
 305 }