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=NULL, *inode_bitmap=NULL;
  90         int inode_blocks_per_group, old_desc_blocks;
  91         int meta_bg, meta_bg_size, has_super;
  92
  93         if (fs->block_map)
  94                 block_bitmap = fs->block_map->bitmap;
  95         if (fs->inode_map)
  96                 inode_bitmap = fs->inode_map->bitmap;
  97
  98         inode_blocks_per_group = ((fs->super->s_inodes_per_group *
  99                                    EXT2_INODE_SIZE(fs->super)) +
 100                                   EXT2_BLOCK_SIZE(fs->super) - 1) /
 101                                  EXT2_BLOCK_SIZE(fs->super);
 102         fputc('\n', stdout);
 103         group_blk = fs->super->s_first_data_block;
 104         if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
 105                 old_desc_blocks = fs->super->s_first_meta_bg;
 106         else
 107                 old_desc_blocks = fs->desc_blocks;
 108         for (i = 0; i < fs->group_desc_count; i++) {
 109                 next_blk = group_blk + fs->super->s_blocks_per_group;
 110                 if (next_blk > fs->super->s_blocks_count)
 111                         next_blk = fs->super->s_blocks_count;
 112                 printf (_("Group %lu: (Blocks "), i);
 113                 printf(range_format, group_blk, next_blk - 1);
 114                 fputs(")\n", stdout);
 115                 has_super = ext2fs_bg_has_super(fs, i);
 116                 if (has_super) {
 117                         printf (_("  %s superblock at "),
 118                                 i == 0 ? _("Primary") : _("Backup"));
 119                         printf(num_format, group_blk);
 120                 }
 121                 meta_bg_size = (fs->blocksize /
 122                                 sizeof (struct ext2_group_desc));
 123                 meta_bg = i / meta_bg_size;
 124                 if (!(fs->super->s_feature_incompat &
 125                       EXT2_FEATURE_INCOMPAT_META_BG) ||
 126                     (meta_bg < fs->super->s_first_meta_bg)) {
 127                         if (has_super) {
 128                                 printf(_(", Group descriptors at "));
 129                                 printf(range_format, group_blk+1,
 130                                        group_blk + old_desc_blocks);
 131                                 fputc('\n', stdout);
 132                         }
 133                 } else {
 134                         if (has_super)
 135                                 has_super = 1;
 136                         if (((i % meta_bg_size) == 0) ||
 137                             ((i % meta_bg_size) == 1) ||
 138                             ((i % meta_bg_size) == (meta_bg_size-1))) {
 139                                 fputc(has_super ? ',' : ' ', stdout);
 140                                 printf(_(" Group descriptor at "));
 141                                 printf(num_format, group_blk + has_super);
 142                                 fputc('\n', stdout);
 143                         } else if (has_super)
 144                                 fputc('\n', stdout);
 145                 }
 146                 fputs(_("  Block bitmap at "), stdout);
 147                 printf(num_format, fs->group_desc[i].bg_block_bitmap);
 148                 diff = fs->group_desc[i].bg_block_bitmap - group_blk;
 149                 if (diff >= 0)
 150                         printf(" (+%ld)", diff);
 151                 fputs(_(", Inode bitmap at "), stdout);
 152                 printf(num_format, fs->group_desc[i].bg_inode_bitmap);
 153                 diff = fs->group_desc[i].bg_inode_bitmap - group_blk;
 154                 if (diff >= 0)
 155                         printf(" (+%ld)", diff);
 156                 fputs(_("\n  Inode table at "), stdout);
 157                 printf(range_format, fs->group_desc[i].bg_inode_table,
 158                        fs->group_desc[i].bg_inode_table +
 159                        inode_blocks_per_group - 1);
 160                 diff = fs->group_desc[i].bg_inode_table - group_blk;
 161                 if (diff > 0)
 162                         printf(" (+%ld)", diff);
 163                 printf (_("\n  %d free blocks, %d free inodes, "
 164                           "%d directories\n"),
 165                         fs->group_desc[i].bg_free_blocks_count,
 166                         fs->group_desc[i].bg_free_inodes_count,
 167                         fs->group_desc[i].bg_used_dirs_count);
 168                 if (block_bitmap) {
 169                         fputs(_("  Free blocks: "), stdout);
 170                         print_free (i, block_bitmap,
 171                                     fs->super->s_blocks_per_group,
 172                                     fs->super->s_first_data_block);
 173                         fputc('\n', stdout);
 174                         block_bitmap += fs->super->s_blocks_per_group / 8;
 175                 }
 176                 if (inode_bitmap) {
 177                         fputs(_("  Free inodes: "), stdout);
 178                         print_free (i, inode_bitmap,
 179                                     fs->super->s_inodes_per_group, 1);
 180                         fputc('\n', stdout);
 181                         inode_bitmap += fs->super->s_inodes_per_group / 8;
 182                 }
 183                 group_blk = next_blk;
 184         }
 185 }
 186
 187 static void list_bad_blocks(ext2_filsys fs, int dump)
 188 {
 189         badblocks_list          bb_list = 0;
 190         badblocks_iterate       bb_iter;
 191         blk_t                   blk;
 192         errcode_t               retval;
 193         const char              *header, *fmt;
 194
 195         retval = ext2fs_read_bb_inode(fs, &bb_list);
 196         if (retval) {
 197                 com_err("ext2fs_read_bb_inode", retval, "");
 198                 return;
 199         }
 200         retval = ext2fs_badblocks_list_iterate_begin(bb_list, &bb_iter);
 201         if (retval) {
 202                 com_err("ext2fs_badblocks_list_iterate_begin", retval,
 203                         _("while printing bad block list"));
 204                 return;
 205         }
 206         if (dump) {
 207                 header = fmt = "%d\n";
 208         } else {
 209                 header =  _("Bad blocks: %d");
 210                 fmt = ", %d";
 211         }
 212         while (ext2fs_badblocks_list_iterate(bb_iter, &blk)) {
 213                 printf(header ? header : fmt, blk);
 214                 header = 0;
 215         }
 216         ext2fs_badblocks_list_iterate_end(bb_iter);
 217         if (!dump)
 218                 fputc('\n', stdout);
 219 }
 220
 221 static void print_journal_information(ext2_filsys fs)
 222 {
 223         errcode_t       retval;
 224         char            buf[1024];
 225         char            str[80];
 226         int             i;
 227         journal_superblock_t    *jsb;
 228
 229         /* Get the journal superblock */
 230         if ((retval = io_channel_read_blk(fs->io, fs->super->s_first_data_block+1, -1024, buf))) {
 231                 com_err(program_name, retval,
 232                         _("while reading journal superblock"));
 233                 exit(1);
 234         }
 235         jsb = (journal_superblock_t *) buf;
 236         if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||
 237             (jsb->s_header.h_blocktype !=
 238              (unsigned) ntohl(JFS_SUPERBLOCK_V2))) {
 239                 com_err(program_name, 0,
 240                         _("Couldn't find journal superblock magic numbers"));
 241                 exit(1);
 242         }
 243
 244         printf(_("\nJournal block size:       %d\n"
 245                  "Journal length:           %d\n"
 246                  "Journal first block:      %d\n"
 247                  "Journal sequence:         0x%08x\n"
 248                  "Journal start:            %d\n"
 249                  "Journal number of users:  %d\n"),
 250                ntohl(jsb->s_blocksize),  ntohl(jsb->s_maxlen),
 251                ntohl(jsb->s_first), ntohl(jsb->s_sequence),
 252                ntohl(jsb->s_start), ntohl(jsb->s_nr_users));
 253
 254         for (i=0; i < ntohl(jsb->s_nr_users); i++) {
 255                 uuid_unparse(&jsb->s_users[i*16], str);
 256                 printf(i ? "                          %s\n"
 257                        : "Journal users:            %s\n",
 258                        str);
 259         }
 260 }
 261
 262 int main (int argc, char ** argv)
 263 {
 264         errcode_t       retval;
 265         ext2_filsys     fs;
 266         int             print_badblocks = 0;
 267         int             use_superblock = 0;
 268         int             use_blocksize = 0;
 269         int             image_dump = 0;
 270         int             force = 0;
 271         int             flags;
 272         int             header_only = 0;
 273         int             big_endian;
 274         int             c;
 275
 276 #ifdef ENABLE_NLS
 277         setlocale(LC_MESSAGES, "");
 278         setlocale(LC_CTYPE, "");
 279         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
 280         textdomain(NLS_CAT_NAME);
 281 #endif
 282         initialize_ext2_error_table();
 283         fprintf (stderr, "dumpe2fs %s (%s)\n", E2FSPROGS_VERSION,
 284                  E2FSPROGS_DATE);
 285         if (argc && *argv)
 286                 program_name = *argv;
 287
 288         while ((c = getopt (argc, argv, "bfhixVo:")) != EOF) {
 289                 switch (c) {
 290                 case 'b':
 291                         print_badblocks++;
 292                         break;
 293                 case 'f':
 294                         force++;
 295                         break;
 296                 case 'h':
 297                         header_only++;
 298                         break;
 299                 case 'i':
 300                         image_dump++;
 301                         break;
 302                 case 'o':
 303                         if (optarg[0] == 'b')
 304                                 use_superblock = atoi(optarg+1);
 305                         else if (optarg[0] == 'B')
 306                                 use_blocksize = atoi(optarg+1);
 307                         else
 308                                 usage();
 309                         break;
 310                 case 'V':
 311                         /* Print version number and exit */
 312                         fprintf(stderr, _("\tUsing %s\n"),
 313                                 error_message(EXT2_ET_BASE));
 314                         exit(0);
 315                 case 'x':
 316                         num_format = "0x%04x";
 317                         break;
 318                 default:
 319                         usage();
 320                 }
 321         }
 322         if (optind > argc - 1)
 323                 usage();
 324         sprintf(range_format, "%s-%s", num_format, num_format);
 325         device_name = argv[optind++];
 326         if (use_superblock && !use_blocksize)
 327                 use_blocksize = 1024;
 328         flags = EXT2_FLAG_JOURNAL_DEV_OK;
 329         if (force)
 330                 flags |= EXT2_FLAG_FORCE;
 331         if (image_dump)
 332                 flags |= EXT2_FLAG_IMAGE_FILE;
 333
 334         retval = ext2fs_open (device_name, flags, use_superblock,
 335                               use_blocksize, unix_io_manager, &fs);
 336         if (retval) {
 337                 com_err (program_name, retval, _("while trying to open %s"),
 338                          device_name);
 339                 printf (_("Couldn't find valid filesystem superblock.\n"));
 340                 exit (1);
 341         }
 342         if (print_badblocks) {
 343                 list_bad_blocks(fs, 1);
 344         } else {
 345                 big_endian = ((fs->flags & EXT2_FLAG_SWAP_BYTES) != 0);
 346 #ifdef WORDS_BIGENDIAN
 347                 big_endian = !big_endian;
 348 #endif
 349                 if (big_endian)
 350                         printf(_("Note: This is a byte-swapped filesystem\n"));
 351                 list_super (fs->super);
 352                 if (fs->super->s_feature_incompat &
 353                       EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
 354                         print_journal_information(fs);
 355                         ext2fs_close(fs);
 356                         exit(0);
 357                 }
 358                 list_bad_blocks(fs, 0);
 359                 if (header_only) {
 360                         ext2fs_close (fs);
 361                         exit (0);
 362                 }
 363                 retval = ext2fs_read_bitmaps (fs);
 364                 list_desc (fs);
 365                 if (retval) {
 366                         printf(_("\n%s: %s: error reading bitmaps: %s\n"),
 367                                program_name, device_name,
 368                                error_message(retval));
 369                 }
 370         }
 371         ext2fs_close (fs);
 372         exit (0);
 373 }