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 "ext2fs/ext2_fs.h"
  36
  37 #include "ext2fs/ext2fs.h"
  38 #include "e2p/e2p.h"
  39 #include "jfs_user.h"
  40 #include <uuid/uuid.h>
  41
  42 #include "../version.h"
  43 #include "nls-enable.h"
  44
  45 #define in_use(m, x)    (ext2fs_test_bit ((x), (m)))
  46
  47 const char * program_name = "dumpe2fs";
  48 char * device_name = NULL;
  49 const char *num_format = "%lu";
  50 char range_format[16];
  51
  52 static void usage(void)
  53 {
  54         fprintf (stderr, _("Usage: %s [-bfhixV] [-ob superblock] "
  55                  "[-oB blocksize] device\n"), program_name);
  56         exit (1);
  57 }
  58
  59 static void print_free (unsigned long group, char * bitmap,
  60                         unsigned long nbytes, unsigned long offset)
  61 {
  62         int p = 0;
  63         unsigned long i;
  64         unsigned long j;
  65
  66         offset += group * nbytes;
  67         for (i = 0; i < nbytes; i++)
  68                 if (!in_use (bitmap, i))
  69                 {
  70                         if (p)
  71                                 printf (", ");
  72                         printf (num_format, i + offset);
  73                         for (j = i; j < nbytes && !in_use (bitmap, j); j++)
  74                                 ;
  75                         if (--j != i) {
  76                                 fputc('-', stdout);
  77                                 printf(num_format, j + offset);
  78                                 i = j;
  79                         }
  80                         p = 1;
  81                 }
  82 }
  83
  84 static void list_desc (ext2_filsys fs)
  85 {
  86         unsigned long i;
  87         long diff;
  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         fputc('\n', stdout);
 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 (_("Group %lu: (Blocks "), i);
 112                 printf(range_format, group_blk, next_blk - 1);
 113                 fputs(")\n", stdout);
 114                 if (ext2fs_bg_has_super (fs, i)) {
 115                         printf (_("  %s Superblock at "),
 116                                 i == 0 ? _("Primary") : _("Backup"));
 117                         printf(num_format, group_blk);
 118                         printf(_(",  Group Descriptors at "));
 119                         printf(range_format, group_blk+1,
 120                                group_blk + group_desc_blocks);
 121                         fputc('\n', stdout);
 122                 }
 123                 fputs(_("  Block bitmap at "), stdout);
 124                 printf(num_format, fs->group_desc[i].bg_block_bitmap);
 125                 diff = fs->group_desc[i].bg_block_bitmap - group_blk;
 126                 if (diff >= 0)
 127                         printf(" (+%ld)", diff);
 128                 fputs(_(", Inode bitmap at "), stdout);
 129                 printf(num_format, fs->group_desc[i].bg_inode_bitmap);
 130                 diff = fs->group_desc[i].bg_inode_bitmap - group_blk;
 131                 if (diff >= 0)
 132                         printf(" (+%ld)", diff);
 133                 fputs(_("\n  Inode table at "), stdout);
 134                 printf(range_format, fs->group_desc[i].bg_inode_table,
 135                        fs->group_desc[i].bg_inode_table +
 136                        inode_blocks_per_group - 1);
 137                 diff = fs->group_desc[i].bg_inode_table - group_blk;
 138                 if (diff > 0)
 139                         printf(" (+%ld)", diff);
 140                 printf (_("\n  %d free blocks, %d free inodes, "
 141                           "%d directories\n  Free blocks: "),
 142                         fs->group_desc[i].bg_free_blocks_count,
 143                         fs->group_desc[i].bg_free_inodes_count,
 144                         fs->group_desc[i].bg_used_dirs_count);
 145                 print_free (i, block_bitmap, fs->super->s_blocks_per_group,
 146                             fs->super->s_first_data_block);
 147                 fputs(_("\n  Free inodes: "), stdout);
 148                 print_free (i, inode_bitmap, fs->super->s_inodes_per_group, 1);
 149                 fputc('\n', stdout);
 150                 block_bitmap += fs->super->s_blocks_per_group / 8;
 151                 inode_bitmap += fs->super->s_inodes_per_group / 8;
 152                 group_blk = next_blk;
 153         }
 154 }
 155
 156 static void list_bad_blocks(ext2_filsys fs, int dump)
 157 {
 158         badblocks_list          bb_list = 0;
 159         badblocks_iterate       bb_iter;
 160         blk_t                   blk;
 161         errcode_t               retval;
 162         const char              *header, *fmt;
 163
 164         retval = ext2fs_read_bb_inode(fs, &bb_list);
 165         if (retval) {
 166                 com_err("ext2fs_read_bb_inode", retval, "");
 167                 return;
 168         }
 169         retval = ext2fs_badblocks_list_iterate_begin(bb_list, &bb_iter);
 170         if (retval) {
 171                 com_err("ext2fs_badblocks_list_iterate_begin", retval,
 172                         _("while printing bad block list"));
 173                 return;
 174         }
 175         if (dump) {
 176                 header = fmt = "%d\n";
 177         } else {
 178                 header =  _("Bad blocks: %d");
 179                 fmt = ", %d";
 180         }
 181         while (ext2fs_badblocks_list_iterate(bb_iter, &blk)) {
 182                 printf(header ? header : fmt, blk);
 183                 header = 0;
 184         }
 185         ext2fs_badblocks_list_iterate_end(bb_iter);
 186         if (!dump)
 187                 fputc('\n', stdout);
 188 }
 189
 190 static void print_journal_information(ext2_filsys fs)
 191 {
 192         errcode_t       retval;
 193         char            buf[1024];
 194         char            str[80];
 195         int             i;
 196         journal_superblock_t    *jsb;
 197
 198         /* Get the journal superblock */
 199         if ((retval = io_channel_read_blk(fs->io, fs->super->s_first_data_block+1, -1024, buf))) {
 200                 com_err(program_name, retval,
 201                         _("while reading journal superblock"));
 202                 exit(1);
 203         }
 204         jsb = (journal_superblock_t *) buf;
 205         if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||
 206             (jsb->s_header.h_blocktype !=
 207              (unsigned) ntohl(JFS_SUPERBLOCK_V2))) {
 208                 com_err(program_name, 0,
 209                         _("Couldn't find journal superblock magic numbers"));
 210                 exit(1);
 211         }
 212
 213         printf(_("\nJournal block size:       %d\n"
 214                  "Journal length:           %d\n"
 215                  "Journal first block:      %d\n"
 216                  "Journal sequence:         0x%08x\n"
 217                  "Journal start:            %d\n"
 218                  "Journal number of users:  %d\n"),
 219                ntohl(jsb->s_blocksize),  ntohl(jsb->s_maxlen),
 220                ntohl(jsb->s_first), ntohl(jsb->s_sequence),
 221                ntohl(jsb->s_start), ntohl(jsb->s_nr_users));
 222
 223         for (i=0; i < ntohl(jsb->s_nr_users); i++) {
 224                 uuid_unparse(&jsb->s_users[i*16], str);
 225                 printf(i ? "                          %s\n"
 226                        : "Journal users:            %s\n",
 227                        str);
 228         }
 229 }
 230
 231 int main (int argc, char ** argv)
 232 {
 233         errcode_t       retval;
 234         ext2_filsys     fs;
 235         int             print_badblocks = 0;
 236         int             use_superblock = 0;
 237         int             use_blocksize = 0;
 238         int             image_dump = 0;
 239         int             force = 0;
 240         int             flags;
 241         int             header_only = 0;
 242         int             big_endian;
 243         int             c;
 244
 245 #ifdef ENABLE_NLS
 246         setlocale(LC_MESSAGES, "");
 247         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
 248         textdomain(NLS_CAT_NAME);
 249 #endif
 250         initialize_ext2_error_table();
 251         fprintf (stderr, "dumpe2fs %s (%s)\n", E2FSPROGS_VERSION,
 252                  E2FSPROGS_DATE);
 253         if (argc && *argv)
 254                 program_name = *argv;
 255
 256         while ((c = getopt (argc, argv, "bfhixVo:")) != EOF) {
 257                 switch (c) {
 258                 case 'b':
 259                         print_badblocks++;
 260                         break;
 261                 case 'f':
 262                         force++;
 263                         break;
 264                 case 'h':
 265                         header_only++;
 266                         break;
 267                 case 'i':
 268                         image_dump++;
 269                         break;
 270                 case 'o':
 271                         if (optarg[0] == 'b')
 272                                 use_superblock = atoi(optarg+1);
 273                         else if (optarg[0] == 'B')
 274                                 use_blocksize = atoi(optarg+1);
 275                         else
 276                                 usage();
 277                         break;
 278                 case 'V':
 279                         /* Print version number and exit */
 280                         fprintf(stderr, _("\tUsing %s\n"),
 281                                 error_message(EXT2_ET_BASE));
 282                         exit(0);
 283                 case 'x':
 284                         num_format = "0x%04x";
 285                         break;
 286                 default:
 287                         usage();
 288                 }
 289         }
 290         if (optind > argc - 1)
 291                 usage();
 292         sprintf(range_format, "%s-%s", num_format, num_format);
 293         device_name = argv[optind++];
 294         if (use_superblock && !use_blocksize)
 295                 use_blocksize = 1024;
 296         flags = EXT2_FLAG_JOURNAL_DEV_OK;
 297         if (force)
 298                 flags |= EXT2_FLAG_FORCE;
 299         if (image_dump)
 300                 flags |= EXT2_FLAG_IMAGE_FILE;
 301
 302         retval = ext2fs_open (device_name, flags, use_superblock,
 303                               use_blocksize, unix_io_manager, &fs);
 304         if (retval) {
 305                 com_err (program_name, retval, _("while trying to open %s"),
 306                          device_name);
 307                 printf (_("Couldn't find valid filesystem superblock.\n"));
 308                 exit (1);
 309         }
 310         if (print_badblocks) {
 311                 list_bad_blocks(fs, 1);
 312         } else {
 313                 big_endian = ((fs->flags & EXT2_FLAG_SWAP_BYTES) != 0);
 314 #ifdef WORDS_BIGENDIAN
 315                 big_endian = !big_endian;
 316 #endif
 317                 if (big_endian)
 318                         printf(_("Note: This is a byte-swapped filesystem\n"));
 319                 list_super (fs->super);
 320                 if (fs->super->s_feature_incompat &
 321                       EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
 322                         print_journal_information(fs);
 323                         ext2fs_close(fs);
 324                         exit(0);
 325                 }
 326                 list_bad_blocks(fs, 0);
 327                 if (header_only) {
 328                         ext2fs_close (fs);
 329                         exit (0);
 330                 }
 331                 retval = ext2fs_read_bitmaps (fs);
 332                 if (retval) {
 333                         com_err (program_name, retval,
 334                                  _("while trying to read the bitmaps"),
 335                                  device_name);
 336                         ext2fs_close (fs);
 337                         exit (1);
 338                 }
 339                 list_desc (fs);
 340         }
 341         ext2fs_close (fs);
 342         exit (0);
 343 }