debugfs/logdump.c

   1 /*
   2  * logdump.c --- dump the contents of the journal out to a file
   3  *
   4  * Author: Stephen C. Tweedie, 2001  <sct@redhat.com>
   5  * Copyright (C) 2001 Red Hat, Inc.
   6  * Based on portions  Copyright (C) 1994 Theodore Ts'o.
   7  *
   8  * This file may be redistributed under the terms of the GNU Public
   9  * License.
  10  */
  11
  12 #include "config.h"
  13 #include <stdio.h>
  14 #include <unistd.h>
  15 #include <stdlib.h>
  16 #include <ctype.h>
  17 #include <string.h>
  18 #include <time.h>
  19 #ifdef HAVE_ERRNO_H
  20 #include <errno.h>
  21 #endif
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <fcntl.h>
  25 #include <utime.h>
  26 #ifdef HAVE_GETOPT_H
  27 #include <getopt.h>
  28 #else
  29 extern int optind;
  30 extern char *optarg;
  31 #endif
  32
  33 #include "debugfs.h"
  34 #include "blkid/blkid.h"
  35 #include "jfs_user.h"
  36 #include <uuid/uuid.h>
  37
  38 enum journal_location {JOURNAL_IS_INTERNAL, JOURNAL_IS_EXTERNAL};
  39
  40 #define ANY_BLOCK ((blk64_t) -1)
  41
  42 static int              dump_all, dump_super, dump_old, dump_contents, dump_descriptors;
  43 static blk64_t          block_to_dump, bitmap_to_dump, inode_block_to_dump;
  44 static unsigned int     group_to_dump, inode_offset_to_dump;
  45 static ext2_ino_t       inode_to_dump;
  46
  47 struct journal_source
  48 {
  49         enum journal_location where;
  50         int fd;
  51         ext2_file_t file;
  52 };
  53
  54 static void dump_journal(char *, FILE *, struct journal_source *);
  55
  56 static void dump_descriptor_block(FILE *, struct journal_source *,
  57                                   char *, journal_superblock_t *,
  58                                   unsigned int *, int, tid_t);
  59
  60 static void dump_revoke_block(FILE *, char *, journal_superblock_t *,
  61                                   unsigned int, int, tid_t);
  62
  63 static void dump_metadata_block(FILE *, struct journal_source *,
  64                                 journal_superblock_t*,
  65                                 unsigned int, unsigned int, unsigned int,
  66                                 int, tid_t);
  67
  68 static void do_hexdump (FILE *, char *, int);
  69
  70 #define WRAP(jsb, blocknr)                                      \
  71         if (blocknr >= be32_to_cpu((jsb)->s_maxlen))            \
  72                 blocknr -= (be32_to_cpu((jsb)->s_maxlen) -      \
  73                             be32_to_cpu((jsb)->s_first));
  74
  75 void do_logdump(int argc, char **argv)
  76 {
  77         int             c;
  78         int             retval;
  79         char            *out_fn;
  80         FILE            *out_file;
  81
  82         char            *inode_spec = NULL;
  83         char            *journal_fn = NULL;
  84         int             journal_fd = 0;
  85         int             use_sb = 0;
  86         ext2_ino_t      journal_inum;
  87         struct ext2_inode journal_inode;
  88         ext2_file_t     journal_file;
  89         char            *tmp;
  90         struct journal_source journal_source;
  91         struct ext2_super_block *es = NULL;
  92
  93         journal_source.where = JOURNAL_IS_INTERNAL;
  94         journal_source.fd = 0;
  95         journal_source.file = 0;
  96         dump_all = 0;
  97         dump_old = 0;
  98         dump_contents = 0;
  99         dump_super = 0;
 100         dump_descriptors = 1;
 101         block_to_dump = ANY_BLOCK;
 102         bitmap_to_dump = -1;
 103         inode_block_to_dump = ANY_BLOCK;
 104         inode_to_dump = -1;
 105
 106         reset_getopt();
 107         while ((c = getopt (argc, argv, "ab:ci:f:OsS")) != EOF) {
 108                 switch (c) {
 109                 case 'a':
 110                         dump_all++;
 111                         break;
 112                 case 'b':
 113                         block_to_dump = strtoul(optarg, &tmp, 0);
 114                         if (*tmp) {
 115                                 com_err(argv[0], 0,
 116                                         "Bad block number - %s", optarg);
 117                                 return;
 118                         }
 119                         dump_descriptors = 0;
 120                         break;
 121                 case 'c':
 122                         dump_contents++;
 123                         break;
 124                 case 'f':
 125                         journal_fn = optarg;
 126                         break;
 127                 case 'i':
 128                         inode_spec = optarg;
 129                         dump_descriptors = 0;
 130                         break;
 131                 case 'O':
 132                         dump_old++;
 133                         break;
 134                 case 's':
 135                         use_sb++;
 136                         break;
 137                 case 'S':
 138                         dump_super++;
 139                         break;
 140                 default:
 141                         goto print_usage;
 142                 }
 143         }
 144         if (optind != argc && optind != argc-1) {
 145                 goto print_usage;
 146         }
 147
 148         if (current_fs)
 149                 es = current_fs->super;
 150
 151         if (inode_spec) {
 152                 int inode_group, group_offset, inodes_per_block;
 153
 154                 if (check_fs_open(argv[0]))
 155                         return;
 156
 157                 inode_to_dump = string_to_inode(inode_spec);
 158                 if (!inode_to_dump)
 159                         return;
 160
 161                 inode_group = ((inode_to_dump - 1)
 162                                / es->s_inodes_per_group);
 163                 group_offset = ((inode_to_dump - 1)
 164                                 % es->s_inodes_per_group);
 165                 inodes_per_block = (current_fs->blocksize
 166                                     / sizeof(struct ext2_inode));
 167
 168                 inode_block_to_dump =
 169                         ext2fs_inode_table_loc(current_fs, inode_group) +
 170                         (group_offset / inodes_per_block);
 171                 inode_offset_to_dump = ((group_offset % inodes_per_block)
 172                                         * sizeof(struct ext2_inode));
 173                 printf("Inode %u is at group %u, block %llu, offset %u\n",
 174                        inode_to_dump, inode_group,
 175                        inode_block_to_dump, inode_offset_to_dump);
 176         }
 177
 178         if (optind == argc) {
 179                 out_file = stdout;
 180         } else {
 181                 out_fn = argv[optind];
 182                 out_file = fopen(out_fn, "w");
 183                 if (!out_file) {
 184                         com_err(argv[0], errno, "while opening %s for logdump",
 185                                 out_fn);
 186                         goto errout;
 187                 }
 188         }
 189
 190         if (block_to_dump != ANY_BLOCK && current_fs != NULL) {
 191                 group_to_dump = ((block_to_dump -
 192                                   es->s_first_data_block)
 193                                  / es->s_blocks_per_group);
 194                 bitmap_to_dump = ext2fs_block_bitmap_loc(current_fs, group_to_dump);
 195         }
 196
 197         if (!journal_fn && check_fs_open(argv[0]))
 198                 goto errout;
 199
 200         if (journal_fn) {
 201                 /* Set up to read journal from a regular file somewhere */
 202                 journal_fd = open(journal_fn, O_RDONLY, 0);
 203                 if (journal_fd < 0) {
 204                         com_err(argv[0], errno, "while opening %s for logdump",
 205                                 journal_fn);
 206                         goto errout;
 207                 }
 208
 209                 journal_source.where = JOURNAL_IS_EXTERNAL;
 210                 journal_source.fd = journal_fd;
 211         } else if ((journal_inum = es->s_journal_inum)) {
 212                 if (use_sb) {
 213                         if (es->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS) {
 214                                 com_err(argv[0], 0,
 215                                         "no journal backup in super block\n");
 216                                 goto errout;
 217                         }
 218                         memset(&journal_inode, 0, sizeof(struct ext2_inode));
 219                         memcpy(&journal_inode.i_block[0], es->s_jnl_blocks,
 220                                EXT2_N_BLOCKS*4);
 221                         journal_inode.i_size_high = es->s_jnl_blocks[15];
 222                         journal_inode.i_size = es->s_jnl_blocks[16];
 223                         journal_inode.i_links_count = 1;
 224                         journal_inode.i_mode = LINUX_S_IFREG | 0600;
 225                 } else {
 226                         if (debugfs_read_inode(journal_inum, &journal_inode,
 227                                                argv[0]))
 228                                 goto errout;
 229                 }
 230
 231                 retval = ext2fs_file_open2(current_fs, journal_inum,
 232                                            &journal_inode, 0, &journal_file);
 233                 if (retval) {
 234                         com_err(argv[0], retval, "while opening ext2 file");
 235                         goto errout;
 236                 }
 237                 journal_source.where = JOURNAL_IS_INTERNAL;
 238                 journal_source.file = journal_file;
 239         } else {
 240                 char uuid[37];
 241
 242                 uuid_unparse(es->s_journal_uuid, uuid);
 243                 journal_fn = blkid_get_devname(NULL, "UUID", uuid);
 244                 if (!journal_fn)
 245                                 journal_fn = blkid_devno_to_devname(es->s_journal_dev);
 246                 if (!journal_fn) {
 247                         com_err(argv[0], 0, "filesystem has no journal");
 248                         goto errout;
 249                 }
 250                 journal_fd = open(journal_fn, O_RDONLY, 0);
 251                 if (journal_fd < 0) {
 252                         com_err(argv[0], errno, "while opening %s for logdump",
 253                                 journal_fn);
 254                         free(journal_fn);
 255                         goto errout;
 256                 }
 257                 fprintf(out_file, "Using external journal found at %s\n",
 258                         journal_fn);
 259                 free(journal_fn);
 260                 journal_source.where = JOURNAL_IS_EXTERNAL;
 261                 journal_source.fd = journal_fd;
 262         }
 263
 264         dump_journal(argv[0], out_file, &journal_source);
 265
 266         if (journal_source.where == JOURNAL_IS_INTERNAL)
 267                 ext2fs_file_close(journal_file);
 268         else
 269                 close(journal_fd);
 270
 271 errout:
 272         if (out_file && (out_file != stdout))
 273                 fclose(out_file);
 274
 275         return;
 276
 277 print_usage:
 278         fprintf(stderr, "%s: Usage: logdump [-acsOS] [-b<block>] [-i<filespec>]\n\t"
 279                 "[-f<journal_file>] [output_file]\n", argv[0]);
 280 }
 281
 282
 283 static int read_journal_block(const char *cmd, struct journal_source *source,
 284                               ext2_loff_t offset, char *buf, unsigned int size)
 285 {
 286         int retval;
 287         unsigned int got;
 288
 289         if (source->where == JOURNAL_IS_EXTERNAL) {
 290                 if (lseek(source->fd, offset, SEEK_SET) < 0) {
 291                         retval = errno;
 292                         goto seek_err;
 293                 }
 294                 retval = read(source->fd, buf, size);
 295                 if (retval < 0) {
 296                         retval = errno;
 297                         goto read_err;
 298                 }
 299                 got = retval;
 300                 retval = 0;
 301         } else {
 302                 retval = ext2fs_file_llseek(source->file, offset,
 303                                             EXT2_SEEK_SET, NULL);
 304                 if (retval) {
 305                 seek_err:
 306                         com_err(cmd, retval, "while seeking in reading journal");
 307                         return retval;
 308                 }
 309                 retval = ext2fs_file_read(source->file, buf, size, &got);
 310                 if (retval) {
 311                 read_err:
 312                         com_err(cmd, retval, "while reading journal");
 313                         return retval;
 314                 }
 315         }
 316         if (got != size) {
 317                 com_err(cmd, 0, "short read (read %u, expected %u) "
 318                         "while reading journal", got, size);
 319                 retval = -1;
 320         }
 321         return retval;
 322 }
 323
 324 static const char *type_to_name(int btype)
 325 {
 326         switch (btype) {
 327         case JFS_DESCRIPTOR_BLOCK:
 328                 return "descriptor block";
 329         case JFS_COMMIT_BLOCK:
 330                 return "commit block";
 331         case JFS_SUPERBLOCK_V1:
 332                 return "V1 superblock";
 333         case JFS_SUPERBLOCK_V2:
 334                 return "V2 superblock";
 335         case JFS_REVOKE_BLOCK:
 336                 return "revoke table";
 337         }
 338         return "unrecognised type";
 339 }
 340
 341
 342 static void dump_journal(char *cmdname, FILE *out_file,
 343                          struct journal_source *source)
 344 {
 345         struct ext2_super_block *sb;
 346         char                    jsb_buffer[1024];
 347         char                    buf[8192];
 348         journal_superblock_t    *jsb;
 349         unsigned int            blocksize = 1024;
 350         int                     retval;
 351         __u32                   magic, sequence, blocktype;
 352         journal_header_t        *header;
 353         tid_t                   transaction;
 354         unsigned int            blocknr = 0;
 355
 356         /* First, check to see if there's an ext2 superblock header */
 357         retval = read_journal_block(cmdname, source, 0, buf, 2048);
 358         if (retval)
 359                 return;
 360
 361         jsb = (journal_superblock_t *) buf;
 362         sb = (struct ext2_super_block *) (buf+1024);
 363 #ifdef WORDS_BIGENDIAN
 364         if (sb->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
 365                 ext2fs_swap_super(sb);
 366 #endif
 367
 368         if ((be32_to_cpu(jsb->s_header.h_magic) != JFS_MAGIC_NUMBER) &&
 369             (sb->s_magic == EXT2_SUPER_MAGIC) &&
 370             ext2fs_has_feature_journal_dev(sb)) {
 371                 blocksize = EXT2_BLOCK_SIZE(sb);
 372                 blocknr = (blocksize == 1024) ? 2 : 1;
 373                 uuid_unparse(sb->s_uuid, jsb_buffer);
 374                 fprintf(out_file, "Ext2 superblock header found.\n");
 375                 if (dump_all) {
 376                         fprintf(out_file, "\tuuid=%s\n", jsb_buffer);
 377                         fprintf(out_file, "\tblocksize=%d\n", blocksize);
 378                         fprintf(out_file, "\tjournal data size %lu\n",
 379                                 (unsigned long) ext2fs_blocks_count(sb));
 380                 }
 381         }
 382
 383         /* Next, read the journal superblock */
 384         retval = read_journal_block(cmdname, source,
 385                                     ((ext2_loff_t) blocknr) * blocksize,
 386                                     jsb_buffer, 1024);
 387         if (retval)
 388                 return;
 389
 390         if (dump_super) {
 391                 e2p_list_journal_super(out_file, jsb_buffer,
 392                                        current_fs->blocksize, 0);
 393                 fputc('\n', out_file);
 394         }
 395
 396         jsb = (journal_superblock_t *) jsb_buffer;
 397         if (be32_to_cpu(jsb->s_header.h_magic) != JFS_MAGIC_NUMBER) {
 398                 fprintf(out_file,
 399                         "Journal superblock magic number invalid!\n");
 400                 return;
 401         }
 402         blocksize = be32_to_cpu(jsb->s_blocksize);
 403         transaction = be32_to_cpu(jsb->s_sequence);
 404         blocknr = be32_to_cpu(jsb->s_start);
 405
 406         fprintf(out_file, "Journal starts at block %u, transaction %u\n",
 407                 blocknr, transaction);
 408
 409         if (!blocknr) {
 410                 /* Empty journal, nothing to do. */
 411                 if (!dump_old)
 412                         return;
 413                 else
 414                         blocknr = 1;
 415         }
 416
 417         while (1) {
 418                 retval = read_journal_block(cmdname, source,
 419                                 ((ext2_loff_t) blocknr) * blocksize,
 420                                 buf, blocksize);
 421                 if (retval)
 422                         return;
 423
 424                 header = (journal_header_t *) buf;
 425
 426                 magic = be32_to_cpu(header->h_magic);
 427                 sequence = be32_to_cpu(header->h_sequence);
 428                 blocktype = be32_to_cpu(header->h_blocktype);
 429
 430                 if (magic != JFS_MAGIC_NUMBER) {
 431                         fprintf (out_file, "No magic number at block %u: "
 432                                  "end of journal.\n", blocknr);
 433                         return;
 434                 }
 435
 436                 if (sequence != transaction) {
 437                         fprintf (out_file, "Found sequence %u (not %u) at "
 438                                  "block %u: end of journal.\n",
 439                                  sequence, transaction, blocknr);
 440                         if (!dump_old)
 441                                 return;
 442                 }
 443
 444                 if (dump_descriptors) {
 445                         fprintf (out_file, "Found expected sequence %u, "
 446                                  "type %u (%s) at block %u\n",
 447                                  sequence, blocktype,
 448                                  type_to_name(blocktype), blocknr);
 449                 }
 450
 451                 switch (blocktype) {
 452                 case JFS_DESCRIPTOR_BLOCK:
 453                         dump_descriptor_block(out_file, source, buf, jsb,
 454                                               &blocknr, blocksize,
 455                                               transaction);
 456                         continue;
 457
 458                 case JFS_COMMIT_BLOCK:
 459                         transaction++;
 460                         blocknr++;
 461                         WRAP(jsb, blocknr);
 462                         continue;
 463
 464                 case JFS_REVOKE_BLOCK:
 465                         dump_revoke_block(out_file, buf, jsb,
 466                                           blocknr, blocksize,
 467                                           transaction);
 468                         blocknr++;
 469                         WRAP(jsb, blocknr);
 470                         continue;
 471
 472                 default:
 473                         fprintf (out_file, "Unexpected block type %u at "
 474                                  "block %u.\n", blocktype, blocknr);
 475                         return;
 476                 }
 477         }
 478 }
 479
 480 static inline size_t journal_super_tag_bytes(journal_superblock_t *jsb)
 481 {
 482         size_t sz;
 483
 484         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JFS_FEATURE_INCOMPAT_CSUM_V3))
 485                 return sizeof(journal_block_tag3_t);
 486
 487         sz = sizeof(journal_block_tag_t);
 488
 489         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JFS_FEATURE_INCOMPAT_CSUM_V2))
 490                 sz += sizeof(__u16);
 491
 492         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JFS_FEATURE_INCOMPAT_64BIT))
 493                 return sz;
 494
 495         return sz - sizeof(__u32);
 496 }
 497
 498 static void dump_descriptor_block(FILE *out_file,
 499                                   struct journal_source *source,
 500                                   char *buf,
 501                                   journal_superblock_t *jsb,
 502                                   unsigned int *blockp, int blocksize,
 503                                   tid_t transaction)
 504 {
 505         int                     offset, tag_size, csum_size = 0;
 506         char                    *tagp;
 507         journal_block_tag_t     *tag;
 508         unsigned int            blocknr;
 509         __u32                   tag_block;
 510         __u32                   tag_flags;
 511
 512         tag_size = journal_super_tag_bytes(jsb);
 513         offset = sizeof(journal_header_t);
 514         blocknr = *blockp;
 515
 516         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JFS_FEATURE_INCOMPAT_CSUM_V3) ||
 517             JSB_HAS_INCOMPAT_FEATURE(jsb, JFS_FEATURE_INCOMPAT_CSUM_V2))
 518                 csum_size = sizeof(struct journal_block_tail);
 519
 520         if (dump_all)
 521                 fprintf(out_file, "Dumping descriptor block, sequence %u, at "
 522                         "block %u:\n", transaction, blocknr);
 523
 524         ++blocknr;
 525         WRAP(jsb, blocknr);
 526
 527         do {
 528                 /* Work out the location of the current tag, and skip to
 529                  * the next one... */
 530                 tagp = &buf[offset];
 531                 tag = (journal_block_tag_t *) tagp;
 532                 offset += tag_size;
 533
 534                 /* ... and if we have gone too far, then we've reached the
 535                    end of this block. */
 536                 if (offset > blocksize - csum_size)
 537                         break;
 538
 539                 tag_block = be32_to_cpu(tag->t_blocknr);
 540                 tag_flags = be16_to_cpu(tag->t_flags);
 541
 542                 if (!(tag_flags & JFS_FLAG_SAME_UUID))
 543                         offset += 16;
 544
 545                 dump_metadata_block(out_file, source, jsb,
 546                                     blocknr, tag_block, tag_flags, blocksize,
 547                                     transaction);
 548
 549                 ++blocknr;
 550                 WRAP(jsb, blocknr);
 551
 552         } while (!(tag_flags & JFS_FLAG_LAST_TAG));
 553
 554         *blockp = blocknr;
 555 }
 556
 557
 558 static void dump_revoke_block(FILE *out_file, char *buf,
 559                               journal_superblock_t *jsb EXT2FS_ATTR((unused)),
 560                               unsigned int blocknr,
 561                               int blocksize EXT2FS_ATTR((unused)),
 562                               tid_t transaction)
 563 {
 564         int                     offset, max;
 565         journal_revoke_header_t *header;
 566         unsigned long long      rblock;
 567         int                     tag_size = sizeof(__u32);
 568
 569         if (dump_all)
 570                 fprintf(out_file, "Dumping revoke block, sequence %u, at "
 571                         "block %u:\n", transaction, blocknr);
 572
 573         if (be32_to_cpu(jsb->s_feature_incompat) & JFS_FEATURE_INCOMPAT_64BIT)
 574                 tag_size = sizeof(__u64);
 575
 576         header = (journal_revoke_header_t *) buf;
 577         offset = sizeof(journal_revoke_header_t);
 578         max = be32_to_cpu(header->r_count);
 579
 580         while (offset < max) {
 581                 if (tag_size == sizeof(__u32)) {
 582                         __u32 *entry = (__u32 *) (buf + offset);
 583                         rblock = be32_to_cpu(*entry);
 584                 } else {
 585                         __u64 *entry = (__u64 *) (buf + offset);
 586                         rblock = ext2fs_be64_to_cpu(*entry);
 587                 }
 588                 if (dump_all || rblock == block_to_dump) {
 589                         fprintf(out_file, "  Revoke FS block %llu", rblock);
 590                         if (dump_all)
 591                                 fprintf(out_file, "\n");
 592                         else
 593                                 fprintf(out_file," at block %u, sequence %u\n",
 594                                         blocknr, transaction);
 595                 }
 596                 offset += tag_size;
 597         }
 598 }
 599
 600
 601 static void show_extent(FILE *out_file, int start_extent, int end_extent,
 602                         __u32 first_block)
 603 {
 604         if (start_extent >= 0 && first_block != 0)
 605                 fprintf(out_file, "(%d+%u): %u ",
 606                         start_extent, end_extent-start_extent, first_block);
 607 }
 608
 609 static void show_indirect(FILE *out_file, const char *name, __u32 where)
 610 {
 611         if (where)
 612                 fprintf(out_file, "(%s): %u ", name, where);
 613 }
 614
 615
 616 static void dump_metadata_block(FILE *out_file, struct journal_source *source,
 617                                 journal_superblock_t *jsb EXT2FS_ATTR((unused)),
 618                                 unsigned int log_blocknr,
 619                                 unsigned int fs_blocknr,
 620                                 unsigned int log_tag_flags,
 621                                 int blocksize,
 622                                 tid_t transaction)
 623 {
 624         int             retval;
 625         char            buf[8192];
 626
 627         if (!(dump_all
 628               || (fs_blocknr == block_to_dump)
 629               || (fs_blocknr == inode_block_to_dump)
 630               || (fs_blocknr == bitmap_to_dump)))
 631                 return;
 632
 633         fprintf(out_file, "  FS block %u logged at ", fs_blocknr);
 634         if (!dump_all)
 635                 fprintf(out_file, "sequence %u, ", transaction);
 636         fprintf(out_file, "journal block %u (flags 0x%x)\n", log_blocknr,
 637                 log_tag_flags);
 638
 639         /* There are two major special cases to parse:
 640          *
 641          * If this block is a block
 642          * bitmap block, we need to give it special treatment so that we
 643          * can log any allocates and deallocates which affect the
 644          * block_to_dump query block.
 645          *
 646          * If the block is an inode block for the inode being searched
 647          * for, then we need to dump the contents of that inode
 648          * structure symbolically.
 649          */
 650
 651         if (!(dump_contents && dump_all)
 652             && fs_blocknr != block_to_dump
 653             && fs_blocknr != bitmap_to_dump
 654             && fs_blocknr != inode_block_to_dump)
 655                 return;
 656
 657         retval = read_journal_block("logdump", source,
 658                                     ((ext2_loff_t) log_blocknr) * blocksize,
 659                                     buf, blocksize);
 660         if (retval)
 661                 return;
 662
 663         if (fs_blocknr == bitmap_to_dump) {
 664                 struct ext2_super_block *super;
 665                 int offset;
 666
 667                 super = current_fs->super;
 668                 offset = ((block_to_dump - super->s_first_data_block) %
 669                           super->s_blocks_per_group);
 670
 671                 fprintf(out_file, "    (block bitmap for block %llu: "
 672                         "block is %s)\n",
 673                         block_to_dump,
 674                         ext2fs_test_bit(offset, buf) ? "SET" : "CLEAR");
 675         }
 676
 677         if (fs_blocknr == inode_block_to_dump) {
 678                 struct ext2_inode *inode;
 679                 int first, prev, this, start_extent, i;
 680
 681                 fprintf(out_file, "    (inode block for inode %u):\n",
 682                         inode_to_dump);
 683
 684                 inode = (struct ext2_inode *) (buf + inode_offset_to_dump);
 685                 internal_dump_inode(out_file, "    ", inode_to_dump, inode, 0);
 686
 687                 /* Dump out the direct/indirect blocks here:
 688                  * internal_dump_inode can only dump them from the main
 689                  * on-disk inode, not from the journaled copy of the
 690                  * inode. */
 691
 692                 fprintf (out_file, "    Blocks:  ");
 693                 first = prev = start_extent = -1;
 694
 695                 for (i=0; i<EXT2_NDIR_BLOCKS; i++) {
 696                         this = inode->i_block[i];
 697                         if (start_extent >= 0  && this == prev+1) {
 698                                 prev = this;
 699                                 continue;
 700                         } else {
 701                                 show_extent(out_file, start_extent, i, first);
 702                                 start_extent = i;
 703                                 first = prev = this;
 704                         }
 705                 }
 706                 show_extent(out_file, start_extent, i, first);
 707                 show_indirect(out_file, "IND", inode->i_block[i++]);
 708                 show_indirect(out_file, "DIND", inode->i_block[i++]);
 709                 show_indirect(out_file, "TIND", inode->i_block[i++]);
 710
 711                 fprintf(out_file, "\n");
 712         }
 713
 714         if (dump_contents)
 715                 do_hexdump(out_file, buf, blocksize);
 716
 717 }
 718
 719 static void do_hexdump (FILE *out_file, char *buf, int blocksize)
 720 {
 721         int i,j;
 722         int *intp;
 723         char *charp;
 724         unsigned char c;
 725
 726         intp = (int *) buf;
 727         charp = (char *) buf;
 728
 729         for (i=0; i<blocksize; i+=16) {
 730                 fprintf(out_file, "    %04x:  ", i);
 731                 for (j=0; j<16; j+=4)
 732                         fprintf(out_file, "%08x ", *intp++);
 733                 for (j=0; j<16; j++) {
 734                         c = *charp++;
 735                         if (c < ' ' || c >= 127)
 736                                 c = '.';
 737                         fprintf(out_file, "%c", c);
 738                 }
 739                 fprintf(out_file, "\n");
 740         }
 741 }
 742