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, int sci_idx EXT2FS_ATTR((unused)),
  76                     void *infop EXT2FS_ATTR((unused)))
  77 {
  78         int             c;
  79         int             retval;
  80         char            *out_fn;
  81         FILE            *out_file;
  82
  83         char            *inode_spec = NULL;
  84         char            *journal_fn = NULL;
  85         int             journal_fd = 0;
  86         int             use_sb = 0;
  87         ext2_ino_t      journal_inum;
  88         struct ext2_inode journal_inode;
  89         ext2_file_t     journal_file;
  90         char            *tmp;
  91         struct journal_source journal_source;
  92         struct ext2_super_block *es = NULL;
  93
  94         journal_source.where = JOURNAL_IS_INTERNAL;
  95         journal_source.fd = 0;
  96         journal_source.file = 0;
  97         dump_all = 0;
  98         dump_old = 0;
  99         dump_contents = 0;
 100         dump_super = 0;
 101         dump_descriptors = 1;
 102         block_to_dump = ANY_BLOCK;
 103         bitmap_to_dump = -1;
 104         inode_block_to_dump = ANY_BLOCK;
 105         inode_to_dump = -1;
 106
 107         reset_getopt();
 108         while ((c = getopt (argc, argv, "ab:ci:f:OsS")) != EOF) {
 109                 switch (c) {
 110                 case 'a':
 111                         dump_all++;
 112                         break;
 113                 case 'b':
 114                         block_to_dump = strtoul(optarg, &tmp, 0);
 115                         if (*tmp) {
 116                                 com_err(argv[0], 0,
 117                                         "Bad block number - %s", optarg);
 118                                 return;
 119                         }
 120                         dump_descriptors = 0;
 121                         break;
 122                 case 'c':
 123                         dump_contents++;
 124                         break;
 125                 case 'f':
 126                         journal_fn = optarg;
 127                         break;
 128                 case 'i':
 129                         inode_spec = optarg;
 130                         dump_descriptors = 0;
 131                         break;
 132                 case 'O':
 133                         dump_old++;
 134                         break;
 135                 case 's':
 136                         use_sb++;
 137                         break;
 138                 case 'S':
 139                         dump_super++;
 140                         break;
 141                 default:
 142                         goto print_usage;
 143                 }
 144         }
 145         if (optind != argc && optind != argc-1) {
 146                 goto print_usage;
 147         }
 148
 149         if (current_fs)
 150                 es = current_fs->super;
 151
 152         if (inode_spec) {
 153                 int inode_group, group_offset, inodes_per_block;
 154
 155                 if (check_fs_open(argv[0]))
 156                         return;
 157
 158                 inode_to_dump = string_to_inode(inode_spec);
 159                 if (!inode_to_dump)
 160                         return;
 161
 162                 inode_group = ((inode_to_dump - 1)
 163                                / es->s_inodes_per_group);
 164                 group_offset = ((inode_to_dump - 1)
 165                                 % es->s_inodes_per_group);
 166                 inodes_per_block = (current_fs->blocksize
 167                                     / sizeof(struct ext2_inode));
 168
 169                 inode_block_to_dump =
 170                         ext2fs_inode_table_loc(current_fs, inode_group) +
 171                         (group_offset / inodes_per_block);
 172                 inode_offset_to_dump = ((group_offset % inodes_per_block)
 173                                         * sizeof(struct ext2_inode));
 174                 printf("Inode %u is at group %u, block %llu, offset %u\n",
 175                        inode_to_dump, inode_group,
 176                        inode_block_to_dump, inode_offset_to_dump);
 177         }
 178
 179         if (optind == argc) {
 180                 out_file = stdout;
 181         } else {
 182                 out_fn = argv[optind];
 183                 out_file = fopen(out_fn, "w");
 184                 if (!out_file) {
 185                         com_err(argv[0], errno, "while opening %s for logdump",
 186                                 out_fn);
 187                         goto errout;
 188                 }
 189         }
 190
 191         if (block_to_dump != ANY_BLOCK && current_fs != NULL) {
 192                 group_to_dump = ((block_to_dump -
 193                                   es->s_first_data_block)
 194                                  / es->s_blocks_per_group);
 195                 bitmap_to_dump = ext2fs_block_bitmap_loc(current_fs, group_to_dump);
 196         }
 197
 198         if (!journal_fn && check_fs_open(argv[0]))
 199                 goto errout;
 200
 201         if (journal_fn) {
 202                 /* Set up to read journal from a regular file somewhere */
 203                 journal_fd = open(journal_fn, O_RDONLY, 0);
 204                 if (journal_fd < 0) {
 205                         com_err(argv[0], errno, "while opening %s for logdump",
 206                                 journal_fn);
 207                         goto errout;
 208                 }
 209
 210                 journal_source.where = JOURNAL_IS_EXTERNAL;
 211                 journal_source.fd = journal_fd;
 212         } else if ((journal_inum = es->s_journal_inum)) {
 213                 if (use_sb) {
 214                         if (es->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS) {
 215                                 com_err(argv[0], 0,
 216                                         "no journal backup in super block\n");
 217                                 goto errout;
 218                         }
 219                         memset(&journal_inode, 0, sizeof(struct ext2_inode));
 220                         memcpy(&journal_inode.i_block[0], es->s_jnl_blocks,
 221                                EXT2_N_BLOCKS*4);
 222                         journal_inode.i_size_high = es->s_jnl_blocks[15];
 223                         journal_inode.i_size = es->s_jnl_blocks[16];
 224                         journal_inode.i_links_count = 1;
 225                         journal_inode.i_mode = LINUX_S_IFREG | 0600;
 226                 } else {
 227                         if (debugfs_read_inode(journal_inum, &journal_inode,
 228                                                argv[0]))
 229                                 goto errout;
 230                 }
 231
 232                 retval = ext2fs_file_open2(current_fs, journal_inum,
 233                                            &journal_inode, 0, &journal_file);
 234                 if (retval) {
 235                         com_err(argv[0], retval, "while opening ext2 file");
 236                         goto errout;
 237                 }
 238                 journal_source.where = JOURNAL_IS_INTERNAL;
 239                 journal_source.file = journal_file;
 240         } else {
 241                 char uuid[37];
 242
 243                 uuid_unparse(es->s_journal_uuid, uuid);
 244                 journal_fn = blkid_get_devname(NULL, "UUID", uuid);
 245                 if (!journal_fn)
 246                                 journal_fn = blkid_devno_to_devname(es->s_journal_dev);
 247                 if (!journal_fn) {
 248                         com_err(argv[0], 0, "filesystem has no journal");
 249                         goto errout;
 250                 }
 251                 journal_fd = open(journal_fn, O_RDONLY, 0);
 252                 if (journal_fd < 0) {
 253                         com_err(argv[0], errno, "while opening %s for logdump",
 254                                 journal_fn);
 255                         free(journal_fn);
 256                         goto errout;
 257                 }
 258                 fprintf(out_file, "Using external journal found at %s\n",
 259                         journal_fn);
 260                 free(journal_fn);
 261                 journal_source.where = JOURNAL_IS_EXTERNAL;
 262                 journal_source.fd = journal_fd;
 263         }
 264
 265         dump_journal(argv[0], out_file, &journal_source);
 266
 267         if (journal_source.where == JOURNAL_IS_INTERNAL)
 268                 ext2fs_file_close(journal_file);
 269         else
 270                 close(journal_fd);
 271
 272 errout:
 273         if (out_file && (out_file != stdout))
 274                 fclose(out_file);
 275
 276         return;
 277
 278 print_usage:
 279         fprintf(stderr, "%s: Usage: logdump [-acsOS] [-b<block>] [-i<filespec>]\n\t"
 280                 "[-f<journal_file>] [output_file]\n", argv[0]);
 281 }
 282
 283
 284 static int read_journal_block(const char *cmd, struct journal_source *source,
 285                               ext2_loff_t offset, char *buf, unsigned int size)
 286 {
 287         int retval;
 288         unsigned int got;
 289
 290         if (source->where == JOURNAL_IS_EXTERNAL) {
 291                 if (lseek(source->fd, offset, SEEK_SET) < 0) {
 292                         retval = errno;
 293                         goto seek_err;
 294                 }
 295                 retval = read(source->fd, buf, size);
 296                 if (retval < 0) {
 297                         retval = errno;
 298                         goto read_err;
 299                 }
 300                 got = retval;
 301                 retval = 0;
 302         } else {
 303                 retval = ext2fs_file_llseek(source->file, offset,
 304                                             EXT2_SEEK_SET, NULL);
 305                 if (retval) {
 306                 seek_err:
 307                         com_err(cmd, retval, "while seeking in reading journal");
 308                         return retval;
 309                 }
 310                 retval = ext2fs_file_read(source->file, buf, size, &got);
 311                 if (retval) {
 312                 read_err:
 313                         com_err(cmd, retval, "while reading journal");
 314                         return retval;
 315                 }
 316         }
 317         if (got != size) {
 318                 com_err(cmd, 0, "short read (read %u, expected %u) "
 319                         "while reading journal", got, size);
 320                 retval = -1;
 321         }
 322         return retval;
 323 }
 324
 325 static const char *type_to_name(int btype)
 326 {
 327         switch (btype) {
 328         case JFS_DESCRIPTOR_BLOCK:
 329                 return "descriptor block";
 330         case JFS_COMMIT_BLOCK:
 331                 return "commit block";
 332         case JFS_SUPERBLOCK_V1:
 333                 return "V1 superblock";
 334         case JFS_SUPERBLOCK_V2:
 335                 return "V2 superblock";
 336         case JFS_REVOKE_BLOCK:
 337                 return "revoke table";
 338         }
 339         return "unrecognised type";
 340 }
 341
 342
 343 static void dump_journal(char *cmdname, FILE *out_file,
 344                          struct journal_source *source)
 345 {
 346         struct ext2_super_block *sb;
 347         char                    jsb_buffer[1024];
 348         char                    buf[8192];
 349         journal_superblock_t    *jsb;
 350         unsigned int            blocksize = 1024;
 351         int                     retval;
 352         __u32                   magic, sequence, blocktype;
 353         journal_header_t        *header;
 354         tid_t                   transaction;
 355         unsigned int            blocknr = 0;
 356
 357         /* First, check to see if there's an ext2 superblock header */
 358         retval = read_journal_block(cmdname, source, 0, buf, 2048);
 359         if (retval)
 360                 return;
 361
 362         jsb = (journal_superblock_t *) buf;
 363         sb = (struct ext2_super_block *) (buf+1024);
 364 #ifdef WORDS_BIGENDIAN
 365         if (sb->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
 366                 ext2fs_swap_super(sb);
 367 #endif
 368
 369         if ((be32_to_cpu(jsb->s_header.h_magic) != JFS_MAGIC_NUMBER) &&
 370             (sb->s_magic == EXT2_SUPER_MAGIC) &&
 371             ext2fs_has_feature_journal_dev(sb)) {
 372                 blocksize = EXT2_BLOCK_SIZE(sb);
 373                 blocknr = (blocksize == 1024) ? 2 : 1;
 374                 uuid_unparse(sb->s_uuid, jsb_buffer);
 375                 fprintf(out_file, "Ext2 superblock header found.\n");
 376                 if (dump_all) {
 377                         fprintf(out_file, "\tuuid=%s\n", jsb_buffer);
 378                         fprintf(out_file, "\tblocksize=%d\n", blocksize);
 379                         fprintf(out_file, "\tjournal data size %lu\n",
 380                                 (unsigned long) ext2fs_blocks_count(sb));
 381                 }
 382         }
 383
 384         /* Next, read the journal superblock */
 385         retval = read_journal_block(cmdname, source,
 386                                     ((ext2_loff_t) blocknr) * blocksize,
 387                                     jsb_buffer, 1024);
 388         if (retval)
 389                 return;
 390
 391         if (dump_super) {
 392                 e2p_list_journal_super(out_file, jsb_buffer,
 393                                        current_fs->blocksize, 0);
 394                 fputc('\n', out_file);
 395         }
 396
 397         jsb = (journal_superblock_t *) jsb_buffer;
 398         if (be32_to_cpu(jsb->s_header.h_magic) != JFS_MAGIC_NUMBER) {
 399                 fprintf(out_file,
 400                         "Journal superblock magic number invalid!\n");
 401                 return;
 402         }
 403         blocksize = be32_to_cpu(jsb->s_blocksize);
 404         transaction = be32_to_cpu(jsb->s_sequence);
 405         blocknr = be32_to_cpu(jsb->s_start);
 406
 407         fprintf(out_file, "Journal starts at block %u, transaction %u\n",
 408                 blocknr, transaction);
 409
 410         if (!blocknr) {
 411                 /* Empty journal, nothing to do. */
 412                 if (!dump_old)
 413                         return;
 414                 else
 415                         blocknr = 1;
 416         }
 417
 418         while (1) {
 419                 retval = read_journal_block(cmdname, source,
 420                                 ((ext2_loff_t) blocknr) * blocksize,
 421                                 buf, blocksize);
 422                 if (retval)
 423                         return;
 424
 425                 header = (journal_header_t *) buf;
 426
 427                 magic = be32_to_cpu(header->h_magic);
 428                 sequence = be32_to_cpu(header->h_sequence);
 429                 blocktype = be32_to_cpu(header->h_blocktype);
 430
 431                 if (magic != JFS_MAGIC_NUMBER) {
 432                         fprintf (out_file, "No magic number at block %u: "
 433                                  "end of journal.\n", blocknr);
 434                         return;
 435                 }
 436
 437                 if (sequence != transaction) {
 438                         fprintf (out_file, "Found sequence %u (not %u) at "
 439                                  "block %u: end of journal.\n",
 440                                  sequence, transaction, blocknr);
 441                         if (!dump_old)
 442                                 return;
 443                 }
 444
 445                 if (dump_descriptors) {
 446                         fprintf (out_file, "Found expected sequence %u, "
 447                                  "type %u (%s) at block %u\n",
 448                                  sequence, blocktype,
 449                                  type_to_name(blocktype), blocknr);
 450                 }
 451
 452                 switch (blocktype) {
 453                 case JFS_DESCRIPTOR_BLOCK:
 454                         dump_descriptor_block(out_file, source, buf, jsb,
 455                                               &blocknr, blocksize,
 456                                               transaction);
 457                         continue;
 458
 459                 case JFS_COMMIT_BLOCK:
 460                         transaction++;
 461                         blocknr++;
 462                         WRAP(jsb, blocknr);
 463                         continue;
 464
 465                 case JFS_REVOKE_BLOCK:
 466                         dump_revoke_block(out_file, buf, jsb,
 467                                           blocknr, blocksize,
 468                                           transaction);
 469                         blocknr++;
 470                         WRAP(jsb, blocknr);
 471                         continue;
 472
 473                 default:
 474                         fprintf (out_file, "Unexpected block type %u at "
 475                                  "block %u.\n", blocktype, blocknr);
 476                         return;
 477                 }
 478         }
 479 }
 480
 481 static inline size_t journal_super_tag_bytes(journal_superblock_t *jsb)
 482 {
 483         size_t sz;
 484
 485         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JFS_FEATURE_INCOMPAT_CSUM_V3))
 486                 return sizeof(journal_block_tag3_t);
 487
 488         sz = sizeof(journal_block_tag_t);
 489
 490         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JFS_FEATURE_INCOMPAT_CSUM_V2))
 491                 sz += sizeof(__u16);
 492
 493         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JFS_FEATURE_INCOMPAT_64BIT))
 494                 return sz;
 495
 496         return sz - sizeof(__u32);
 497 }
 498
 499 static void dump_descriptor_block(FILE *out_file,
 500                                   struct journal_source *source,
 501                                   char *buf,
 502                                   journal_superblock_t *jsb,
 503                                   unsigned int *blockp, int blocksize,
 504                                   tid_t transaction)
 505 {
 506         int                     offset, tag_size, csum_size = 0;
 507         char                    *tagp;
 508         journal_block_tag_t     *tag;
 509         unsigned int            blocknr;
 510         __u32                   tag_block;
 511         __u32                   tag_flags;
 512
 513         tag_size = journal_super_tag_bytes(jsb);
 514         offset = sizeof(journal_header_t);
 515         blocknr = *blockp;
 516
 517         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JFS_FEATURE_INCOMPAT_CSUM_V3) ||
 518             JSB_HAS_INCOMPAT_FEATURE(jsb, JFS_FEATURE_INCOMPAT_CSUM_V2))
 519                 csum_size = sizeof(struct journal_block_tail);
 520
 521         if (dump_all)
 522                 fprintf(out_file, "Dumping descriptor block, sequence %u, at "
 523                         "block %u:\n", transaction, blocknr);
 524
 525         ++blocknr;
 526         WRAP(jsb, blocknr);
 527
 528         do {
 529                 /* Work out the location of the current tag, and skip to
 530                  * the next one... */
 531                 tagp = &buf[offset];
 532                 tag = (journal_block_tag_t *) tagp;
 533                 offset += tag_size;
 534
 535                 /* ... and if we have gone too far, then we've reached the
 536                    end of this block. */
 537                 if (offset > blocksize - csum_size)
 538                         break;
 539
 540                 tag_block = be32_to_cpu(tag->t_blocknr);
 541                 tag_flags = be16_to_cpu(tag->t_flags);
 542
 543                 if (!(tag_flags & JFS_FLAG_SAME_UUID))
 544                         offset += 16;
 545
 546                 dump_metadata_block(out_file, source, jsb,
 547                                     blocknr, tag_block, tag_flags, blocksize,
 548                                     transaction);
 549
 550                 ++blocknr;
 551                 WRAP(jsb, blocknr);
 552
 553         } while (!(tag_flags & JFS_FLAG_LAST_TAG));
 554
 555         *blockp = blocknr;
 556 }
 557
 558
 559 static void dump_revoke_block(FILE *out_file, char *buf,
 560                               journal_superblock_t *jsb EXT2FS_ATTR((unused)),
 561                               unsigned int blocknr,
 562                               int blocksize EXT2FS_ATTR((unused)),
 563                               tid_t transaction)
 564 {
 565         int                     offset, max;
 566         journal_revoke_header_t *header;
 567         unsigned long long      rblock;
 568         int                     tag_size = sizeof(__u32);
 569
 570         if (dump_all)
 571                 fprintf(out_file, "Dumping revoke block, sequence %u, at "
 572                         "block %u:\n", transaction, blocknr);
 573
 574         if (be32_to_cpu(jsb->s_feature_incompat) & JFS_FEATURE_INCOMPAT_64BIT)
 575                 tag_size = sizeof(__u64);
 576
 577         header = (journal_revoke_header_t *) buf;
 578         offset = sizeof(journal_revoke_header_t);
 579         max = be32_to_cpu(header->r_count);
 580
 581         while (offset < max) {
 582                 if (tag_size == sizeof(__u32)) {
 583                         __u32 *entry = (__u32 *) (buf + offset);
 584                         rblock = be32_to_cpu(*entry);
 585                 } else {
 586                         __u64 *entry = (__u64 *) (buf + offset);
 587                         rblock = ext2fs_be64_to_cpu(*entry);
 588                 }
 589                 if (dump_all || rblock == block_to_dump) {
 590                         fprintf(out_file, "  Revoke FS block %llu", rblock);
 591                         if (dump_all)
 592                                 fprintf(out_file, "\n");
 593                         else
 594                                 fprintf(out_file," at block %u, sequence %u\n",
 595                                         blocknr, transaction);
 596                 }
 597                 offset += tag_size;
 598         }
 599 }
 600
 601
 602 static void show_extent(FILE *out_file, int start_extent, int end_extent,
 603                         __u32 first_block)
 604 {
 605         if (start_extent >= 0 && first_block != 0)
 606                 fprintf(out_file, "(%d+%u): %u ",
 607                         start_extent, end_extent-start_extent, first_block);
 608 }
 609
 610 static void show_indirect(FILE *out_file, const char *name, __u32 where)
 611 {
 612         if (where)
 613                 fprintf(out_file, "(%s): %u ", name, where);
 614 }
 615
 616
 617 static void dump_metadata_block(FILE *out_file, struct journal_source *source,
 618                                 journal_superblock_t *jsb EXT2FS_ATTR((unused)),
 619                                 unsigned int log_blocknr,
 620                                 unsigned int fs_blocknr,
 621                                 unsigned int log_tag_flags,
 622                                 int blocksize,
 623                                 tid_t transaction)
 624 {
 625         int             retval;
 626         char            buf[8192];
 627
 628         if (!(dump_all
 629               || (fs_blocknr == block_to_dump)
 630               || (fs_blocknr == inode_block_to_dump)
 631               || (fs_blocknr == bitmap_to_dump)))
 632                 return;
 633
 634         fprintf(out_file, "  FS block %u logged at ", fs_blocknr);
 635         if (!dump_all)
 636                 fprintf(out_file, "sequence %u, ", transaction);
 637         fprintf(out_file, "journal block %u (flags 0x%x)\n", log_blocknr,
 638                 log_tag_flags);
 639
 640         /* There are two major special cases to parse:
 641          *
 642          * If this block is a block
 643          * bitmap block, we need to give it special treatment so that we
 644          * can log any allocates and deallocates which affect the
 645          * block_to_dump query block.
 646          *
 647          * If the block is an inode block for the inode being searched
 648          * for, then we need to dump the contents of that inode
 649          * structure symbolically.
 650          */
 651
 652         if (!(dump_contents && dump_all)
 653             && fs_blocknr != block_to_dump
 654             && fs_blocknr != bitmap_to_dump
 655             && fs_blocknr != inode_block_to_dump)
 656                 return;
 657
 658         retval = read_journal_block("logdump", source,
 659                                     ((ext2_loff_t) log_blocknr) * blocksize,
 660                                     buf, blocksize);
 661         if (retval)
 662                 return;
 663
 664         if (fs_blocknr == bitmap_to_dump) {
 665                 struct ext2_super_block *super;
 666                 int offset;
 667
 668                 super = current_fs->super;
 669                 offset = ((block_to_dump - super->s_first_data_block) %
 670                           super->s_blocks_per_group);
 671
 672                 fprintf(out_file, "    (block bitmap for block %llu: "
 673                         "block is %s)\n",
 674                         block_to_dump,
 675                         ext2fs_test_bit(offset, buf) ? "SET" : "CLEAR");
 676         }
 677
 678         if (fs_blocknr == inode_block_to_dump) {
 679                 struct ext2_inode *inode;
 680                 int first, prev, this, start_extent, i;
 681
 682                 fprintf(out_file, "    (inode block for inode %u):\n",
 683                         inode_to_dump);
 684
 685                 inode = (struct ext2_inode *) (buf + inode_offset_to_dump);
 686                 internal_dump_inode(out_file, "    ", inode_to_dump, inode, 0);
 687
 688                 /* Dump out the direct/indirect blocks here:
 689                  * internal_dump_inode can only dump them from the main
 690                  * on-disk inode, not from the journaled copy of the
 691                  * inode. */
 692
 693                 fprintf (out_file, "    Blocks:  ");
 694                 first = prev = start_extent = -1;
 695
 696                 for (i=0; i<EXT2_NDIR_BLOCKS; i++) {
 697                         this = inode->i_block[i];
 698                         if (start_extent >= 0  && this == prev+1) {
 699                                 prev = this;
 700                                 continue;
 701                         } else {
 702                                 show_extent(out_file, start_extent, i, first);
 703                                 start_extent = i;
 704                                 first = prev = this;
 705                         }
 706                 }
 707                 show_extent(out_file, start_extent, i, first);
 708                 show_indirect(out_file, "IND", inode->i_block[i++]);
 709                 show_indirect(out_file, "DIND", inode->i_block[i++]);
 710                 show_indirect(out_file, "TIND", inode->i_block[i++]);
 711
 712                 fprintf(out_file, "\n");
 713         }
 714
 715         if (dump_contents)
 716                 do_hexdump(out_file, buf, blocksize);
 717
 718 }
 719
 720 static void do_hexdump (FILE *out_file, char *buf, int blocksize)
 721 {
 722         int i,j;
 723         int *intp;
 724         char *charp;
 725         unsigned char c;
 726
 727         intp = (int *) buf;
 728         charp = (char *) buf;
 729
 730         for (i=0; i<blocksize; i+=16) {
 731                 fprintf(out_file, "    %04x:  ", i);
 732                 for (j=0; j<16; j+=4)
 733                         fprintf(out_file, "%08x ", *intp++);
 734                 for (j=0; j<16; j++) {
 735                         c = *charp++;
 736                         if (c < ' ' || c >= 127)
 737                                 c = '.';
 738                         fprintf(out_file, "%c", c);
 739                 }
 740                 fprintf(out_file, "\n");
 741         }
 742 }
 743