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