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
  51 static void usage(void)
  52 {
  53         fprintf (stderr, _("Usage: %s [-bfhixV] [-ob superblock] "
  54                  "[-oB blocksize] device\n"), program_name);
  55         exit (1);
  56 }
  57
  58 static void print_free (unsigned long group, char * bitmap,
  59                         unsigned long nbytes, unsigned long offset)
  60 {
  61         int p = 0;
  62         unsigned long i;
  63         unsigned long j;
  64
  65         offset += group * nbytes;
  66         for (i = 0; i < nbytes; i++)
  67                 if (!in_use (bitmap, i))
  68                 {
  69                         if (p)
  70                                 printf (", ");
  71                         printf (num_format, i + offset);
  72                         for (j = i; j < nbytes && !in_use (bitmap, j); j++)
  73                                 ;
  74                         if (--j != i) {
  75                                 fputc('-', stdout);
  76                                 printf(num_format, j + offset);
  77                                 i = j;
  78                         }
  79                         p = 1;
  80                 }
  81 }
  82
  83 static void list_desc (ext2_filsys fs)
  84 {
  85         unsigned long i;
  86         long diff;
  87         blk_t   group_blk, next_blk;
  88         char * block_bitmap = fs->block_map->bitmap;
  89         char * inode_bitmap = fs->inode_map->bitmap;
  90         int inode_blocks_per_group;
  91         int group_desc_blocks;
  92
  93         inode_blocks_per_group = ((fs->super->s_inodes_per_group *
  94                                    EXT2_INODE_SIZE(fs->super)) +
  95                                   EXT2_BLOCK_SIZE(fs->super) - 1) /
  96                                  EXT2_BLOCK_SIZE(fs->super);
  97         group_desc_blocks = ((fs->super->s_blocks_count -
  98                               fs->super->s_first_data_block +
  99                               EXT2_BLOCKS_PER_GROUP(fs->super) - 1) /
 100                              EXT2_BLOCKS_PER_GROUP(fs->super) +
 101                              EXT2_DESC_PER_BLOCK(fs->super) - 1) /
 102                             EXT2_DESC_PER_BLOCK(fs->super);
 103
 104         fputc('\n', stdout);
 105         group_blk = fs->super->s_first_data_block;
 106         for (i = 0; i < fs->group_desc_count; i++) {
 107                 next_blk = group_blk + fs->super->s_blocks_per_group;
 108                 if (next_blk > fs->super->s_blocks_count)
 109                         next_blk = fs->super->s_blocks_count;
 110                 printf (_("Group %lu: (Blocks "), i);
 111                 printf(num_format, group_blk);
 112                 fputc('-', stdout);
 113                 printf(num_format, next_blk - 1);
 114                 fputs(")\n", stdout);
 115                 if (ext2fs_bg_has_super (fs, i)) {
 116                         printf (_("  %s Superblock at "),
 117                                 i == 0 ? _("Primary") : _("Backup"));
 118                         printf(num_format, group_blk);
 119                         printf(_(",  Group Descriptors at "));
 120                         printf(num_format, group_blk+1);
 121                         fputc('-', stdout);
 122                         printf(num_format, group_blk + group_desc_blocks);
 123                         fputc('\n', stdout);
 124                 }
 125                 fputs(_("  Block bitmap at "), stdout);
 126                 printf(num_format, fs->group_desc[i].bg_block_bitmap);
 127                 diff = fs->group_desc[i].bg_block_bitmap - group_blk;
 128                 if (diff >= 0)
 129                         printf(" (+%ld)", diff);
 130                 fputs(_(", Inode bitmap at "), stdout);
 131                 printf(num_format, fs->group_desc[i].bg_inode_bitmap);
 132                 diff = fs->group_desc[i].bg_inode_bitmap - group_blk;
 133                 if (diff >= 0)
 134                         printf(" (+%ld)", diff);
 135                 fputs(_("\n  Inode table at "), stdout);
 136                 printf(num_format, fs->group_desc[i].bg_inode_table);
 137                 fputc('-', stdout);
 138                 printf(num_format, fs->group_desc[i].bg_inode_table +
 139                        inode_blocks_per_group - 1);
 140                 diff = fs->group_desc[i].bg_inode_table - group_blk;
 141                 if (diff > 0)
 142                         printf(" (+%ld)", diff);
 143                 printf (_("\n  %d free blocks, %d free inodes, "
 144                           "%d directories\n  Free blocks: "),
 145                         fs->group_desc[i].bg_free_blocks_count,
 146                         fs->group_desc[i].bg_free_inodes_count,
 147                         fs->group_desc[i].bg_used_dirs_count);
 148                 print_free (i, block_bitmap, fs->super->s_blocks_per_group,
 149                             fs->super->s_first_data_block);
 150                 fputs(_("\n  Free inodes: "), stdout);
 151                 print_free (i, inode_bitmap, fs->super->s_inodes_per_group, 1);
 152                 fputc('\n', stdout);
 153                 block_bitmap += fs->super->s_blocks_per_group / 8;
 154                 inode_bitmap += fs->super->s_inodes_per_group / 8;
 155                 group_blk = next_blk;
 156         }
 157 }
 158
 159 static void list_bad_blocks(ext2_filsys fs)
 160 {
 161         badblocks_list          bb_list = 0;
 162         badblocks_iterate       bb_iter;
 163         blk_t                   blk;
 164         errcode_t               retval;
 165
 166         retval = ext2fs_read_bb_inode(fs, &bb_list);
 167         if (retval) {
 168                 com_err("ext2fs_read_bb_inode", retval, "");
 169                 exit(1);
 170         }
 171         retval = ext2fs_badblocks_list_iterate_begin(bb_list, &bb_iter);
 172         if (retval) {
 173                 com_err("ext2fs_badblocks_list_iterate_begin", retval,
 174                         _("while printing bad block list"));
 175                 exit(1);
 176         }
 177         if (ext2fs_badblocks_list_iterate(bb_iter, &blk))
 178                 printf(_("Bad blocks: %d"), blk);
 179         while (ext2fs_badblocks_list_iterate(bb_iter, &blk))
 180                 printf(", %d", blk);
 181         ext2fs_badblocks_list_iterate_end(bb_iter);
 182         fputc('\n', stdout);
 183 }
 184
 185 static void dump_bad_blocks(ext2_filsys fs)
 186 {
 187         badblocks_list          bb_list = 0;
 188         badblocks_iterate       bb_iter;
 189         blk_t                   blk;
 190         errcode_t               retval;
 191
 192         retval = ext2fs_read_bb_inode(fs, &bb_list);
 193         if (retval) {
 194                 com_err("ext2fs_read_bb_inode", retval, "");
 195                 exit(1);
 196         }
 197         retval = ext2fs_badblocks_list_iterate_begin(bb_list, &bb_iter);
 198         if (retval) {
 199                 com_err("ext2fs_badblocks_list_iterate_begin", retval,
 200                         _("while printing bad block list"));
 201                 exit(1);
 202         }
 203         while (ext2fs_badblocks_list_iterate(bb_iter, &blk))
 204                 printf("%d\n", blk);
 205         ext2fs_badblocks_list_iterate_end(bb_iter);
 206 }
 207
 208 static void print_journal_information(ext2_filsys fs)
 209 {
 210         errcode_t       retval;
 211         char            buf[1024];
 212         char            str[80];
 213         int             i;
 214         journal_superblock_t    *jsb;
 215
 216         /* Get the journal superblock */
 217         if ((retval = io_channel_read_blk(fs->io, fs->super->s_first_data_block+1, -1024, buf))) {
 218                 com_err(program_name, retval,
 219                         _("while reading journal superblock"));
 220                 exit(1);
 221         }
 222         jsb = (journal_superblock_t *) buf;
 223         if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||
 224             (jsb->s_header.h_blocktype !=
 225              (unsigned) ntohl(JFS_SUPERBLOCK_V2))) {
 226                 com_err(program_name, 0,
 227                         _("Couldn't find journal superblock magic numbers"));
 228                 exit(1);
 229         }
 230
 231         printf(_("\nJournal block size:       %d\n"
 232                  "Journal length:           %d\n"
 233                  "Journal first block:      %d\n"
 234                  "Journal sequence:         0x%08x\n"
 235                  "Journal start:            %d\n"
 236                  "Journal number of users:  %d\n"),
 237                ntohl(jsb->s_blocksize),  ntohl(jsb->s_maxlen),
 238                ntohl(jsb->s_first), ntohl(jsb->s_sequence),
 239                ntohl(jsb->s_start), ntohl(jsb->s_nr_users));
 240
 241         for (i=0; i < ntohl(jsb->s_nr_users); i++) {
 242                 uuid_unparse(&jsb->s_users[i*16], str);
 243                 printf(i ? "                          %s\n"
 244                        : "Journal users:            %s\n",
 245                        str);
 246         }
 247 }
 248
 249 int main (int argc, char ** argv)
 250 {
 251         errcode_t       retval;
 252         ext2_filsys     fs;
 253         int             print_badblocks = 0;
 254         int             use_superblock = 0;
 255         int             use_blocksize = 0;
 256         int             image_dump = 0;
 257         int             force = 0;
 258         int             flags;
 259         int             header_only = 0;
 260         int             big_endian;
 261         int             c;
 262
 263 #ifdef ENABLE_NLS
 264         setlocale(LC_MESSAGES, "");
 265         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
 266         textdomain(NLS_CAT_NAME);
 267 #endif
 268         initialize_ext2_error_table();
 269         fprintf (stderr, "dumpe2fs %s (%s)\n", E2FSPROGS_VERSION,
 270                  E2FSPROGS_DATE);
 271         if (argc && *argv)
 272                 program_name = *argv;
 273
 274         while ((c = getopt (argc, argv, "bfhixVo:")) != EOF) {
 275                 switch (c) {
 276                 case 'b':
 277                         print_badblocks++;
 278                         break;
 279                 case 'f':
 280                         force++;
 281                         break;
 282                 case 'h':
 283                         header_only++;
 284                         break;
 285                 case 'i':
 286                         image_dump++;
 287                         break;
 288                 case 'o':
 289                         if (optarg[0] == 'b')
 290                                 use_superblock = atoi(optarg+1);
 291                         else if (optarg[0] == 'B')
 292                                 use_blocksize = atoi(optarg+1);
 293                         else
 294                                 usage();
 295                         break;
 296                 case 'V':
 297                         /* Print version number and exit */
 298                         fprintf(stderr, _("\tUsing %s\n"),
 299                                 error_message(EXT2_ET_BASE));
 300                         exit(0);
 301                 case 'x':
 302                         num_format = "0x%04x";
 303                         break;
 304                 default:
 305                         usage();
 306                 }
 307         }
 308         if (optind > argc - 1)
 309                 usage();
 310         device_name = argv[optind++];
 311         if (use_superblock && !use_blocksize)
 312                 use_blocksize = 1024;
 313         flags = EXT2_FLAG_JOURNAL_DEV_OK;
 314         if (force)
 315                 flags |= EXT2_FLAG_FORCE;
 316         if (image_dump)
 317                 flags |= EXT2_FLAG_IMAGE_FILE;
 318
 319         retval = ext2fs_open (device_name, flags, use_superblock,
 320                               use_blocksize, unix_io_manager, &fs);
 321         if (retval) {
 322                 com_err (program_name, retval, _("while trying to open %s"),
 323                          device_name);
 324                 printf (_("Couldn't find valid filesystem superblock.\n"));
 325                 exit (1);
 326         }
 327         if (print_badblocks) {
 328                 dump_bad_blocks(fs);
 329         } else {
 330                 big_endian = ((fs->flags & EXT2_FLAG_SWAP_BYTES) != 0);
 331 #ifdef WORDS_BIGENDIAN
 332                 big_endian = !big_endian;
 333 #endif
 334                 if (big_endian)
 335                         printf(_("Note: This is a byte-swapped filesystem\n"));
 336                 list_super (fs->super);
 337                 if (fs->super->s_feature_incompat &
 338                       EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
 339                         print_journal_information(fs);
 340                         ext2fs_close(fs);
 341                         exit(0);
 342                 }
 343                 list_bad_blocks (fs);
 344                 if (header_only) {
 345                         ext2fs_close (fs);
 346                         exit (0);
 347                 }
 348                 retval = ext2fs_read_bitmaps (fs);
 349                 if (retval) {
 350                         com_err (program_name, retval,
 351                                  _("while trying to read the bitmaps"),
 352                                  device_name);
 353                         ext2fs_close (fs);
 354                         exit (1);
 355                 }
 356                 list_desc (fs);
 357         }
 358         ext2fs_close (fs);
 359         exit (0);
 360 }