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