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 int hex_format = 0;
  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_number(unsigned long num)
  59 {
  60         if (hex_format)
  61                 printf("0x%04lx", num);
  62         else
  63                 printf("%lu", num);
  64 }
  65
  66 static void print_range(unsigned long a, unsigned long b)
  67 {
  68         if (hex_format)
  69                 printf("0x%04lx-0x%04lx", a, b);
  70         else
  71                 printf("%lu-%lu", a, b);
  72 }
  73
  74 static void print_free (unsigned long group, char * bitmap,
  75                         unsigned long nbytes, unsigned long offset)
  76 {
  77         int p = 0;
  78         unsigned long i;
  79         unsigned long j;
  80
  81         offset += group * nbytes;
  82         for (i = 0; i < nbytes; i++)
  83                 if (!in_use (bitmap, i))
  84                 {
  85                         if (p)
  86                                 printf (", ");
  87                         print_number(i + offset);
  88                         for (j = i; j < nbytes && !in_use (bitmap, j); j++)
  89                                 ;
  90                         if (--j != i) {
  91                                 fputc('-', stdout);
  92                                 print_number(j + offset);
  93                                 i = j;
  94                         }
  95                         p = 1;
  96                 }
  97 }
  98
  99 static void list_desc (ext2_filsys fs)
 100 {
 101         unsigned long i;
 102         long diff;
 103         blk_t   group_blk, next_blk;
 104         blk_t   super_blk, old_desc_blk, new_desc_blk;
 105         char *block_bitmap=NULL, *inode_bitmap=NULL;
 106         int inode_blocks_per_group, old_desc_blocks, reserved_gdt;
 107         int has_super;
 108
 109         if (fs->block_map)
 110                 block_bitmap = fs->block_map->bitmap;
 111         if (fs->inode_map)
 112                 inode_bitmap = fs->inode_map->bitmap;
 113
 114         inode_blocks_per_group = ((fs->super->s_inodes_per_group *
 115                                    EXT2_INODE_SIZE(fs->super)) +
 116                                   EXT2_BLOCK_SIZE(fs->super) - 1) /
 117                                  EXT2_BLOCK_SIZE(fs->super);
 118         reserved_gdt = fs->super->s_reserved_gdt_blocks;
 119         fputc('\n', stdout);
 120         group_blk = fs->super->s_first_data_block;
 121         if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
 122                 old_desc_blocks = fs->super->s_first_meta_bg;
 123         else
 124                 old_desc_blocks = fs->desc_blocks;
 125         for (i = 0; i < fs->group_desc_count; i++) {
 126                 ext2fs_super_and_bgd_loc(fs, i, &super_blk,
 127                                          &old_desc_blk, &new_desc_blk, 0);
 128                 next_blk = group_blk + fs->super->s_blocks_per_group;
 129                 if (next_blk > fs->super->s_blocks_count)
 130                         next_blk = fs->super->s_blocks_count;
 131                 printf (_("Group %lu: (Blocks "), i);
 132                 print_range(group_blk, next_blk - 1);
 133                 fputs(")\n", stdout);
 134                 has_super = ((i==0) || super_blk);
 135                 if (has_super) {
 136                         printf (_("  %s superblock at "),
 137                                 i == 0 ? _("Primary") : _("Backup"));
 138                         print_number(super_blk);
 139                 }
 140                 if (old_desc_blk) {
 141                         printf(_(", Group descriptors at "));
 142                         print_range(old_desc_blk,
 143                                     old_desc_blk + old_desc_blocks - 1);
 144                         if (reserved_gdt) {
 145                                 printf(_("\n  Reserved GDT blocks at "));
 146                                 print_range(old_desc_blk + old_desc_blocks,
 147                                             old_desc_blk + old_desc_blocks +
 148                                             reserved_gdt - 1);
 149                         }
 150                 } else if (new_desc_blk) {
 151                         fputc(has_super ? ',' : ' ', stdout);
 152                         printf(_(" Group descriptor at "));
 153                         print_number(new_desc_blk);
 154                         has_super++;
 155                 }
 156                 if (has_super)
 157                         fputc('\n', stdout);
 158                 fputs(_("  Block bitmap at "), stdout);
 159                 print_number(fs->group_desc[i].bg_block_bitmap);
 160                 diff = fs->group_desc[i].bg_block_bitmap - group_blk;
 161                 if (diff >= 0)
 162                         printf(" (+%ld)", diff);
 163                 fputs(_(", Inode bitmap at "), stdout);
 164                 print_number(fs->group_desc[i].bg_inode_bitmap);
 165                 diff = fs->group_desc[i].bg_inode_bitmap - group_blk;
 166                 if (diff >= 0)
 167                         printf(" (+%ld)", diff);
 168                 fputs(_("\n  Inode table at "), stdout);
 169                 print_range(fs->group_desc[i].bg_inode_table,
 170                             fs->group_desc[i].bg_inode_table +
 171                             inode_blocks_per_group - 1);
 172                 diff = fs->group_desc[i].bg_inode_table - group_blk;
 173                 if (diff > 0)
 174                         printf(" (+%ld)", diff);
 175                 printf (_("\n  %d free blocks, %d free inodes, "
 176                           "%d directories\n"),
 177                         fs->group_desc[i].bg_free_blocks_count,
 178                         fs->group_desc[i].bg_free_inodes_count,
 179                         fs->group_desc[i].bg_used_dirs_count);
 180                 if (block_bitmap) {
 181                         fputs(_("  Free blocks: "), stdout);
 182                         print_free (i, block_bitmap,
 183                                     fs->super->s_blocks_per_group,
 184                                     fs->super->s_first_data_block);
 185                         fputc('\n', stdout);
 186                         block_bitmap += fs->super->s_blocks_per_group / 8;
 187                 }
 188                 if (inode_bitmap) {
 189                         fputs(_("  Free inodes: "), stdout);
 190                         print_free (i, inode_bitmap,
 191                                     fs->super->s_inodes_per_group, 1);
 192                         fputc('\n', stdout);
 193                         inode_bitmap += fs->super->s_inodes_per_group / 8;
 194                 }
 195                 group_blk = next_blk;
 196         }
 197 }
 198
 199 static void list_bad_blocks(ext2_filsys fs, int dump)
 200 {
 201         badblocks_list          bb_list = 0;
 202         badblocks_iterate       bb_iter;
 203         blk_t                   blk;
 204         errcode_t               retval;
 205         const char              *header, *fmt;
 206
 207         retval = ext2fs_read_bb_inode(fs, &bb_list);
 208         if (retval) {
 209                 com_err("ext2fs_read_bb_inode", retval, 0);
 210                 return;
 211         }
 212         retval = ext2fs_badblocks_list_iterate_begin(bb_list, &bb_iter);
 213         if (retval) {
 214                 com_err("ext2fs_badblocks_list_iterate_begin", retval,
 215                         _("while printing bad block list"));
 216                 return;
 217         }
 218         if (dump) {
 219                 header = fmt = "%d\n";
 220         } else {
 221                 header =  _("Bad blocks: %d");
 222                 fmt = ", %d";
 223         }
 224         while (ext2fs_badblocks_list_iterate(bb_iter, &blk)) {
 225                 printf(header ? header : fmt, blk);
 226                 header = 0;
 227         }
 228         ext2fs_badblocks_list_iterate_end(bb_iter);
 229         if (!dump)
 230                 fputc('\n', stdout);
 231 }
 232
 233 static void print_journal_information(ext2_filsys fs)
 234 {
 235         errcode_t       retval;
 236         char            buf[1024];
 237         char            str[80];
 238         unsigned int    i;
 239         journal_superblock_t    *jsb;
 240
 241         /* Get the journal superblock */
 242         if ((retval = io_channel_read_blk(fs->io, fs->super->s_first_data_block+1, -1024, buf))) {
 243                 com_err(program_name, retval,
 244                         _("while reading journal superblock"));
 245                 exit(1);
 246         }
 247         jsb = (journal_superblock_t *) buf;
 248         if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||
 249             (jsb->s_header.h_blocktype !=
 250              (unsigned) ntohl(JFS_SUPERBLOCK_V2))) {
 251                 com_err(program_name, 0,
 252                         _("Couldn't find journal superblock magic numbers"));
 253                 exit(1);
 254         }
 255
 256         printf(_("\nJournal block size:       %d\n"
 257                  "Journal length:           %d\n"
 258                  "Journal first block:      %d\n"
 259                  "Journal sequence:         0x%08x\n"
 260                  "Journal start:            %d\n"
 261                  "Journal number of users:  %d\n"),
 262                ntohl(jsb->s_blocksize),  ntohl(jsb->s_maxlen),
 263                ntohl(jsb->s_first), ntohl(jsb->s_sequence),
 264                ntohl(jsb->s_start), ntohl(jsb->s_nr_users));
 265
 266         for (i=0; i < ntohl(jsb->s_nr_users); i++) {
 267                 uuid_unparse(&jsb->s_users[i*16], str);
 268                 printf(i ? "                          %s\n"
 269                        : _("Journal users:            %s\n"),
 270                        str);
 271         }
 272 }
 273
 274 int main (int argc, char ** argv)
 275 {
 276         errcode_t       retval;
 277         ext2_filsys     fs;
 278         int             print_badblocks = 0;
 279         int             use_superblock = 0;
 280         int             use_blocksize = 0;
 281         int             image_dump = 0;
 282         int             force = 0;
 283         int             flags;
 284         int             header_only = 0;
 285         int             big_endian;
 286         int             c;
 287
 288 #ifdef ENABLE_NLS
 289         setlocale(LC_MESSAGES, "");
 290         setlocale(LC_CTYPE, "");
 291         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
 292         textdomain(NLS_CAT_NAME);
 293 #endif
 294         initialize_ext2_error_table();
 295         fprintf (stderr, "dumpe2fs %s (%s)\n", E2FSPROGS_VERSION,
 296                  E2FSPROGS_DATE);
 297         if (argc && *argv)
 298                 program_name = *argv;
 299
 300         while ((c = getopt (argc, argv, "bfhixVo:")) != EOF) {
 301                 switch (c) {
 302                 case 'b':
 303                         print_badblocks++;
 304                         break;
 305                 case 'f':
 306                         force++;
 307                         break;
 308                 case 'h':
 309                         header_only++;
 310                         break;
 311                 case 'i':
 312                         image_dump++;
 313                         break;
 314                 case 'o':
 315                         if (optarg[0] == 'b')
 316                                 use_superblock = atoi(optarg+1);
 317                         else if (optarg[0] == 'B')
 318                                 use_blocksize = atoi(optarg+1);
 319                         else
 320                                 usage();
 321                         break;
 322                 case 'V':
 323                         /* Print version number and exit */
 324                         fprintf(stderr, _("\tUsing %s\n"),
 325                                 error_message(EXT2_ET_BASE));
 326                         exit(0);
 327                 case 'x':
 328                         hex_format++;
 329                         break;
 330                 default:
 331                         usage();
 332                 }
 333         }
 334         if (optind > argc - 1)
 335                 usage();
 336         device_name = argv[optind++];
 337         if (use_superblock && !use_blocksize)
 338                 use_blocksize = 1024;
 339         flags = EXT2_FLAG_JOURNAL_DEV_OK;
 340         if (force)
 341                 flags |= EXT2_FLAG_FORCE;
 342         if (image_dump)
 343                 flags |= EXT2_FLAG_IMAGE_FILE;
 344
 345         retval = ext2fs_open (device_name, flags, use_superblock,
 346                               use_blocksize, unix_io_manager, &fs);
 347         if (retval) {
 348                 com_err (program_name, retval, _("while trying to open %s"),
 349                          device_name);
 350                 printf (_("Couldn't find valid filesystem superblock.\n"));
 351                 exit (1);
 352         }
 353         if (print_badblocks) {
 354                 list_bad_blocks(fs, 1);
 355         } else {
 356                 big_endian = ((fs->flags & EXT2_FLAG_SWAP_BYTES) != 0);
 357 #ifdef WORDS_BIGENDIAN
 358                 big_endian = !big_endian;
 359 #endif
 360                 if (big_endian)
 361                         printf(_("Note: This is a byte-swapped filesystem\n"));
 362                 list_super (fs->super);
 363                 if (fs->super->s_feature_incompat &
 364                       EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
 365                         print_journal_information(fs);
 366                         ext2fs_close(fs);
 367                         exit(0);
 368                 }
 369                 list_bad_blocks(fs, 0);
 370                 if (header_only) {
 371                         ext2fs_close (fs);
 372                         exit (0);
 373                 }
 374                 retval = ext2fs_read_bitmaps (fs);
 375                 list_desc (fs);
 376                 if (retval) {
 377                         printf(_("\n%s: %s: error reading bitmaps: %s\n"),
 378                                program_name, device_name,
 379                                error_message(retval));
 380                 }
 381         }
 382         ext2fs_close (fs);
 383         exit (0);
 384 }