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 "ext2fs/fast_commit.h"
  37 #include <uuid/uuid.h>
  38
  39 enum journal_location {JOURNAL_IS_INTERNAL, JOURNAL_IS_EXTERNAL};
  40
  41 #define ANY_BLOCK ((blk64_t) -1)
  42
  43 static int              dump_all, dump_super, dump_old, dump_contents, dump_descriptors;
  44 static blk64_t          block_to_dump, bitmap_to_dump, inode_block_to_dump;
  45 static unsigned int     group_to_dump, inode_offset_to_dump;
  46 static ext2_ino_t       inode_to_dump;
  47
  48 struct journal_source
  49 {
  50         enum journal_location where;
  51         int fd;
  52         ext2_file_t file;
  53 };
  54
  55 static void dump_journal(char *, FILE *, struct journal_source *);
  56
  57 static void dump_descriptor_block(FILE *, struct journal_source *,
  58                                   char *, journal_superblock_t *,
  59                                   unsigned int *, int, tid_t);
  60
  61 static void dump_revoke_block(FILE *, char *, journal_superblock_t *,
  62                                   unsigned int, int, tid_t);
  63
  64 static void dump_metadata_block(FILE *, struct journal_source *,
  65                                 journal_superblock_t*,
  66                                 unsigned int, unsigned int, unsigned int,
  67                                 int, tid_t);
  68
  69 static void dump_fc_block(FILE *out_file, char *buf, int blocksize,
  70                           int transaction, int *fc_done, int dump_old);
  71
  72 static void do_hexdump (FILE *, char *, int);
  73
  74 #define WRAP(jsb, blocknr)                                      \
  75         if (blocknr >= be32_to_cpu((jsb)->s_maxlen))            \
  76                 blocknr -= (be32_to_cpu((jsb)->s_maxlen) -      \
  77                             be32_to_cpu((jsb)->s_first));
  78
  79 void do_logdump(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
  80                     void *infop EXT2FS_ATTR((unused)))
  81 {
  82         int             c;
  83         int             retval;
  84         char            *out_fn;
  85         FILE            *out_file;
  86
  87         char            *inode_spec = NULL;
  88         char            *journal_fn = NULL;
  89         int             journal_fd = 0;
  90         int             use_sb = 0;
  91         ext2_ino_t      journal_inum;
  92         struct ext2_inode journal_inode;
  93         ext2_file_t     journal_file;
  94         char            *tmp;
  95         struct journal_source journal_source;
  96         struct ext2_super_block *es = NULL;
  97
  98         journal_source.where = JOURNAL_IS_INTERNAL;
  99         journal_source.fd = 0;
 100         journal_source.file = 0;
 101         dump_all = 0;
 102         dump_old = 0;
 103         dump_contents = 0;
 104         dump_super = 0;
 105         dump_descriptors = 1;
 106         block_to_dump = ANY_BLOCK;
 107         bitmap_to_dump = -1;
 108         inode_block_to_dump = ANY_BLOCK;
 109         inode_to_dump = -1;
 110
 111         reset_getopt();
 112         while ((c = getopt (argc, argv, "ab:ci:f:OsS")) != EOF) {
 113                 switch (c) {
 114                 case 'a':
 115                         dump_all++;
 116                         break;
 117                 case 'b':
 118                         block_to_dump = strtoul(optarg, &tmp, 0);
 119                         if (*tmp) {
 120                                 com_err(argv[0], 0,
 121                                         "Bad block number - %s", optarg);
 122                                 return;
 123                         }
 124                         dump_descriptors = 0;
 125                         break;
 126                 case 'c':
 127                         dump_contents++;
 128                         break;
 129                 case 'f':
 130                         journal_fn = optarg;
 131                         break;
 132                 case 'i':
 133                         inode_spec = optarg;
 134                         dump_descriptors = 0;
 135                         break;
 136                 case 'O':
 137                         dump_old++;
 138                         break;
 139                 case 's':
 140                         use_sb++;
 141                         break;
 142                 case 'S':
 143                         dump_super++;
 144                         break;
 145                 default:
 146                         goto print_usage;
 147                 }
 148         }
 149         if (optind != argc && optind != argc-1) {
 150                 goto print_usage;
 151         }
 152
 153         if (current_fs)
 154                 es = current_fs->super;
 155
 156         if (inode_spec) {
 157                 int inode_group, group_offset, inodes_per_block;
 158
 159                 if (check_fs_open(argv[0]))
 160                         return;
 161
 162                 inode_to_dump = string_to_inode(inode_spec);
 163                 if (!inode_to_dump)
 164                         return;
 165
 166                 inode_group = ((inode_to_dump - 1)
 167                                / es->s_inodes_per_group);
 168                 group_offset = ((inode_to_dump - 1)
 169                                 % es->s_inodes_per_group);
 170                 inodes_per_block = (current_fs->blocksize
 171                                     / sizeof(struct ext2_inode));
 172
 173                 inode_block_to_dump =
 174                         ext2fs_inode_table_loc(current_fs, inode_group) +
 175                         (group_offset / inodes_per_block);
 176                 inode_offset_to_dump = ((group_offset % inodes_per_block)
 177                                         * sizeof(struct ext2_inode));
 178                 printf("Inode %u is at group %u, block %llu, offset %u\n",
 179                        inode_to_dump, inode_group,
 180                        inode_block_to_dump, inode_offset_to_dump);
 181         }
 182
 183         if (optind == argc) {
 184                 out_file = stdout;
 185         } else {
 186                 out_fn = argv[optind];
 187                 out_file = fopen(out_fn, "w");
 188                 if (!out_file) {
 189                         com_err(argv[0], errno, "while opening %s for logdump",
 190                                 out_fn);
 191                         goto errout;
 192                 }
 193         }
 194
 195         if (block_to_dump != ANY_BLOCK && current_fs != NULL) {
 196                 group_to_dump = ((block_to_dump -
 197                                   es->s_first_data_block)
 198                                  / es->s_blocks_per_group);
 199                 bitmap_to_dump = ext2fs_block_bitmap_loc(current_fs, group_to_dump);
 200         }
 201
 202         if (!journal_fn && check_fs_open(argv[0]))
 203                 goto errout;
 204
 205         if (journal_fn) {
 206                 /* Set up to read journal from a regular file somewhere */
 207                 journal_fd = open(journal_fn, O_RDONLY, 0);
 208                 if (journal_fd < 0) {
 209                         com_err(argv[0], errno, "while opening %s for logdump",
 210                                 journal_fn);
 211                         goto errout;
 212                 }
 213
 214                 journal_source.where = JOURNAL_IS_EXTERNAL;
 215                 journal_source.fd = journal_fd;
 216         } else if ((journal_inum = es->s_journal_inum)) {
 217                 if (use_sb) {
 218                         if (es->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS) {
 219                                 com_err(argv[0], 0,
 220                                         "no journal backup in super block\n");
 221                                 goto errout;
 222                         }
 223                         memset(&journal_inode, 0, sizeof(struct ext2_inode));
 224                         memcpy(&journal_inode.i_block[0], es->s_jnl_blocks,
 225                                EXT2_N_BLOCKS*4);
 226                         journal_inode.i_size_high = es->s_jnl_blocks[15];
 227                         journal_inode.i_size = es->s_jnl_blocks[16];
 228                         journal_inode.i_links_count = 1;
 229                         journal_inode.i_mode = LINUX_S_IFREG | 0600;
 230                 } else {
 231                         if (debugfs_read_inode(journal_inum, &journal_inode,
 232                                                argv[0]))
 233                                 goto errout;
 234                 }
 235
 236                 retval = ext2fs_file_open2(current_fs, journal_inum,
 237                                            &journal_inode, 0, &journal_file);
 238                 if (retval) {
 239                         com_err(argv[0], retval, "while opening ext2 file");
 240                         goto errout;
 241                 }
 242                 journal_source.where = JOURNAL_IS_INTERNAL;
 243                 journal_source.file = journal_file;
 244         } else {
 245                 char uuid[37];
 246
 247                 uuid_unparse(es->s_journal_uuid, uuid);
 248                 journal_fn = blkid_get_devname(NULL, "UUID", uuid);
 249                 if (!journal_fn)
 250                                 journal_fn = blkid_devno_to_devname(es->s_journal_dev);
 251                 if (!journal_fn) {
 252                         com_err(argv[0], 0, "filesystem has no journal");
 253                         goto errout;
 254                 }
 255                 journal_fd = open(journal_fn, O_RDONLY, 0);
 256                 if (journal_fd < 0) {
 257                         com_err(argv[0], errno, "while opening %s for logdump",
 258                                 journal_fn);
 259                         free(journal_fn);
 260                         goto errout;
 261                 }
 262                 fprintf(out_file, "Using external journal found at %s\n",
 263                         journal_fn);
 264                 free(journal_fn);
 265                 journal_source.where = JOURNAL_IS_EXTERNAL;
 266                 journal_source.fd = journal_fd;
 267         }
 268
 269         dump_journal(argv[0], out_file, &journal_source);
 270
 271         if (journal_source.where == JOURNAL_IS_INTERNAL)
 272                 ext2fs_file_close(journal_file);
 273         else
 274                 close(journal_fd);
 275
 276 errout:
 277         if (out_file && (out_file != stdout))
 278                 fclose(out_file);
 279
 280         return;
 281
 282 print_usage:
 283         fprintf(stderr, "%s: Usage: logdump [-acsOS] [-b<block>] [-i<filespec>]\n\t"
 284                 "[-f<journal_file>] [output_file]\n", argv[0]);
 285 }
 286
 287
 288 static int read_journal_block(const char *cmd, struct journal_source *source,
 289                               ext2_loff_t offset, char *buf, unsigned int size)
 290 {
 291         int retval;
 292         unsigned int got;
 293
 294         if (source->where == JOURNAL_IS_EXTERNAL) {
 295                 if (lseek(source->fd, offset, SEEK_SET) < 0) {
 296                         retval = errno;
 297                         goto seek_err;
 298                 }
 299                 retval = read(source->fd, buf, size);
 300                 if (retval < 0) {
 301                         retval = errno;
 302                         goto read_err;
 303                 }
 304                 got = retval;
 305                 retval = 0;
 306         } else {
 307                 retval = ext2fs_file_llseek(source->file, offset,
 308                                             EXT2_SEEK_SET, NULL);
 309                 if (retval) {
 310                 seek_err:
 311                         com_err(cmd, retval, "while seeking in reading journal");
 312                         return retval;
 313                 }
 314                 retval = ext2fs_file_read(source->file, buf, size, &got);
 315                 if (retval) {
 316                 read_err:
 317                         com_err(cmd, retval, "while reading journal");
 318                         return retval;
 319                 }
 320         }
 321         if (got != size) {
 322                 com_err(cmd, 0, "short read (read %u, expected %u) "
 323                         "while reading journal", got, size);
 324                 retval = -1;
 325         }
 326         return retval;
 327 }
 328
 329 static const char *type_to_name(int btype)
 330 {
 331         switch (btype) {
 332         case JBD2_DESCRIPTOR_BLOCK:
 333                 return "descriptor block";
 334         case JBD2_COMMIT_BLOCK:
 335                 return "commit block";
 336         case JBD2_SUPERBLOCK_V1:
 337                 return "V1 superblock";
 338         case JBD2_SUPERBLOCK_V2:
 339                 return "V2 superblock";
 340         case JBD2_REVOKE_BLOCK:
 341                 return "revoke table";
 342         }
 343         return "unrecognised type";
 344 }
 345
 346
 347 static void dump_journal(char *cmdname, FILE *out_file,
 348                          struct journal_source *source)
 349 {
 350         struct ext2_super_block *sb;
 351         char                    jsb_buffer[1024];
 352         char                    buf[8192];
 353         journal_superblock_t    *jsb;
 354         unsigned int            blocksize = 1024;
 355         int                     retval;
 356         __u32                   magic, sequence, blocktype;
 357         journal_header_t        *header;
 358         tid_t                   transaction;
 359         unsigned int            blocknr = 0;
 360         int                     fc_done;
 361
 362         /* First, check to see if there's an ext2 superblock header */
 363         retval = read_journal_block(cmdname, source, 0, buf, 2048);
 364         if (retval)
 365                 return;
 366
 367         jsb = (journal_superblock_t *) buf;
 368         sb = (struct ext2_super_block *) (buf+1024);
 369 #ifdef WORDS_BIGENDIAN
 370         if (sb->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
 371                 ext2fs_swap_super(sb);
 372 #endif
 373
 374         if ((be32_to_cpu(jsb->s_header.h_magic) != JBD2_MAGIC_NUMBER) &&
 375             (sb->s_magic == EXT2_SUPER_MAGIC) &&
 376             ext2fs_has_feature_journal_dev(sb)) {
 377                 blocksize = EXT2_BLOCK_SIZE(sb);
 378                 blocknr = (blocksize == 1024) ? 2 : 1;
 379                 uuid_unparse(sb->s_uuid, jsb_buffer);
 380                 fprintf(out_file, "Ext2 superblock header found.\n");
 381                 if (dump_all) {
 382                         fprintf(out_file, "\tuuid=%s\n", jsb_buffer);
 383                         fprintf(out_file, "\tblocksize=%d\n", blocksize);
 384                         fprintf(out_file, "\tjournal data size %lu\n",
 385                                 (unsigned long) ext2fs_blocks_count(sb));
 386                 }
 387         }
 388
 389         /* Next, read the journal superblock */
 390         retval = read_journal_block(cmdname, source,
 391                                     ((ext2_loff_t) blocknr) * blocksize,
 392                                     jsb_buffer, 1024);
 393         if (retval)
 394                 return;
 395
 396         if (dump_super) {
 397                 e2p_list_journal_super(out_file, jsb_buffer,
 398                                        current_fs->blocksize, 0);
 399                 fputc('\n', out_file);
 400         }
 401
 402         jsb = (journal_superblock_t *) jsb_buffer;
 403         if (be32_to_cpu(jsb->s_header.h_magic) != JBD2_MAGIC_NUMBER) {
 404                 fprintf(out_file,
 405                         "Journal superblock magic number invalid!\n");
 406                 return;
 407         }
 408         blocksize = be32_to_cpu(jsb->s_blocksize);
 409         transaction = be32_to_cpu(jsb->s_sequence);
 410         blocknr = be32_to_cpu(jsb->s_start);
 411
 412         fprintf(out_file, "Journal starts at block %u, transaction %u\n",
 413                 blocknr, transaction);
 414
 415         if (!blocknr) {
 416                 /* Empty journal, nothing to do. */
 417                 if (!dump_old)
 418                         goto fc;
 419                 else
 420                         blocknr = 1;
 421         }
 422
 423         while (1) {
 424                 retval = read_journal_block(cmdname, source,
 425                                 ((ext2_loff_t) blocknr) * blocksize,
 426                                 buf, blocksize);
 427                 if (retval)
 428                         break;
 429
 430                 header = (journal_header_t *) buf;
 431
 432                 magic = be32_to_cpu(header->h_magic);
 433                 sequence = be32_to_cpu(header->h_sequence);
 434                 blocktype = be32_to_cpu(header->h_blocktype);
 435
 436                 if (magic != JBD2_MAGIC_NUMBER) {
 437                         fprintf (out_file, "No magic number at block %u: "
 438                                  "end of journal.\n", blocknr);
 439                         break;
 440                 }
 441
 442                 if (sequence != transaction) {
 443                         fprintf (out_file, "Found sequence %u (not %u) at "
 444                                  "block %u: end of journal.\n",
 445                                  sequence, transaction, blocknr);
 446                         if (!dump_old)
 447                                 break;
 448                 }
 449
 450                 if (dump_descriptors) {
 451                         fprintf (out_file, "Found expected sequence %u, "
 452                                  "type %u (%s) at block %u\n",
 453                                  sequence, blocktype,
 454                                  type_to_name(blocktype), blocknr);
 455                 }
 456
 457                 switch (blocktype) {
 458                 case JBD2_DESCRIPTOR_BLOCK:
 459                         dump_descriptor_block(out_file, source, buf, jsb,
 460                                               &blocknr, blocksize,
 461                                               transaction);
 462                         continue;
 463
 464                 case JBD2_COMMIT_BLOCK:
 465                         transaction++;
 466                         blocknr++;
 467                         WRAP(jsb, blocknr);
 468                         continue;
 469
 470                 case JBD2_REVOKE_BLOCK:
 471                         dump_revoke_block(out_file, buf, jsb,
 472                                           blocknr, blocksize,
 473                                           transaction);
 474                         blocknr++;
 475                         WRAP(jsb, blocknr);
 476                         continue;
 477
 478                 default:
 479                         fprintf (out_file, "Unexpected block type %u at "
 480                                  "block %u.\n", blocktype, blocknr);
 481                         break;
 482                 }
 483         }
 484
 485 fc:
 486         blocknr = be32_to_cpu(jsb->s_maxlen) - jbd2_journal_get_num_fc_blks(jsb) + 1;
 487         while (blocknr <= be32_to_cpu(jsb->s_maxlen)) {
 488                 retval = read_journal_block(cmdname, source,
 489                                 ((ext2_loff_t) blocknr) * blocksize,
 490                                 buf, blocksize);
 491                 if (retval)
 492                         return;
 493
 494                 dump_fc_block(out_file, buf, blocksize, transaction, &fc_done,
 495                         dump_old);
 496                 if (!dump_old && fc_done)
 497                         break;
 498                 blocknr++;
 499         }
 500 }
 501
 502 static inline size_t journal_super_tag_bytes(journal_superblock_t *jsb)
 503 {
 504         size_t sz;
 505
 506         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JBD2_FEATURE_INCOMPAT_CSUM_V3))
 507                 return sizeof(journal_block_tag3_t);
 508
 509         sz = sizeof(journal_block_tag_t);
 510
 511         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JBD2_FEATURE_INCOMPAT_CSUM_V2))
 512                 sz += sizeof(__u16);
 513
 514         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JBD2_FEATURE_INCOMPAT_64BIT))
 515                 return sz;
 516
 517         return sz - sizeof(__u32);
 518 }
 519
 520 static void dump_fc_block(FILE *out_file, char *buf, int blocksize,
 521         int transaction, int *fc_done, int dump_old)
 522 {
 523         struct ext4_fc_tl       *tl;
 524         struct ext4_fc_head     *head;
 525         struct ext4_fc_add_range        *add_range;
 526         struct ext4_fc_del_range        *del_range;
 527         struct ext4_fc_dentry_info      *dentry_info;
 528         struct ext4_fc_tail             *tail;
 529         struct ext3_extent      *ex;
 530
 531         *fc_done = 0;
 532         fc_for_each_tl(buf, buf + blocksize, tl) {
 533                 switch (le16_to_cpu(tl->fc_tag)) {
 534                 case EXT4_FC_TAG_ADD_RANGE:
 535                         add_range =
 536                                 (struct ext4_fc_add_range *)ext4_fc_tag_val(tl);
 537                         ex = (struct ext3_extent *)add_range->fc_ex;
 538                         fprintf(out_file,
 539                                 "tag %s, inode %d, lblk %d, pblk %ld, len %d\n",
 540                                 tag2str(tl->fc_tag),
 541                                 le32_to_cpu(add_range->fc_ino),
 542                                 le32_to_cpu(ex->ee_block),
 543                                 le32_to_cpu(ex->ee_start) +
 544                                 (((__u64) le16_to_cpu(ex->ee_start_hi)) << 32),
 545                                 le16_to_cpu(ex->ee_len) > EXT_INIT_MAX_LEN ?
 546                                 le16_to_cpu(ex->ee_len) - EXT_INIT_MAX_LEN :
 547                                 le16_to_cpu(ex->ee_len));
 548                         break;
 549                 case EXT4_FC_TAG_DEL_RANGE:
 550                         del_range =
 551                                 (struct ext4_fc_del_range *)ext4_fc_tag_val(tl);
 552                         fprintf(out_file, "tag %s, inode %d, lblk %d, len %d\n",
 553                                 tag2str(tl->fc_tag),
 554                                 le32_to_cpu(del_range->fc_ino),
 555                                 le32_to_cpu(del_range->fc_lblk),
 556                                 le32_to_cpu(del_range->fc_len));
 557                         break;
 558                 case EXT4_FC_TAG_LINK:
 559                 case EXT4_FC_TAG_UNLINK:
 560                 case EXT4_FC_TAG_CREAT:
 561                         dentry_info =
 562                                 (struct ext4_fc_dentry_info *)
 563                                         ext4_fc_tag_val(tl);
 564                         fprintf(out_file,
 565                                 "tag %s, parent %d, ino %d, name \"%s\"\n",
 566                                 tag2str(tl->fc_tag),
 567                                 le32_to_cpu(dentry_info->fc_parent_ino),
 568                                 le32_to_cpu(dentry_info->fc_ino),
 569                                 dentry_info->fc_dname);
 570                         break;
 571                 case EXT4_FC_TAG_INODE:
 572                         fprintf(out_file, "tag %s, inode %d\n",
 573                                 tag2str(tl->fc_tag),
 574                                 le32_to_cpu(((struct ext4_fc_inode *)
 575                                         ext4_fc_tag_val(tl))->fc_ino));
 576                         break;
 577                 case EXT4_FC_TAG_PAD:
 578                         fprintf(out_file, "tag %s\n", tag2str(tl->fc_tag));
 579                         break;
 580                 case EXT4_FC_TAG_TAIL:
 581                         tail = (struct ext4_fc_tail *)ext4_fc_tag_val(tl);
 582                         fprintf(out_file, "tag %s, tid %d\n",
 583                                 tag2str(tl->fc_tag),
 584                                 le32_to_cpu(tail->fc_tid));
 585                         if (!dump_old &&
 586                                 le32_to_cpu(tail->fc_tid) < transaction) {
 587                                 *fc_done = 1;
 588                                 return;
 589                         }
 590                         break;
 591                 case EXT4_FC_TAG_HEAD:
 592                         fprintf(out_file, "\n*** Fast Commit Area ***\n");
 593                         head = (struct ext4_fc_head *)ext4_fc_tag_val(tl);
 594                         fprintf(out_file, "tag %s, features 0x%x, tid %d\n",
 595                                 tag2str(tl->fc_tag),
 596                                 le32_to_cpu(head->fc_features),
 597                                 le32_to_cpu(head->fc_tid));
 598                         if (!dump_old &&
 599                                 le32_to_cpu(head->fc_tid) < transaction) {
 600                                 *fc_done = 1;
 601                                 return;
 602                         }
 603                         break;
 604                 default:
 605                         *fc_done = 1;
 606                         break;
 607                 }
 608         }
 609 }
 610
 611 static void dump_descriptor_block(FILE *out_file,
 612                                   struct journal_source *source,
 613                                   char *buf,
 614                                   journal_superblock_t *jsb,
 615                                   unsigned int *blockp, int blocksize,
 616                                   tid_t transaction)
 617 {
 618         int                     offset, tag_size, csum_size = 0;
 619         char                    *tagp;
 620         journal_block_tag_t     *tag;
 621         unsigned int            blocknr;
 622         __u32                   tag_block;
 623         __u32                   tag_flags;
 624
 625         tag_size = journal_super_tag_bytes(jsb);
 626         offset = sizeof(journal_header_t);
 627         blocknr = *blockp;
 628
 629         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JBD2_FEATURE_INCOMPAT_CSUM_V3) ||
 630             JSB_HAS_INCOMPAT_FEATURE(jsb, JBD2_FEATURE_INCOMPAT_CSUM_V2))
 631                 csum_size = sizeof(struct jbd2_journal_block_tail);
 632
 633         if (dump_all)
 634                 fprintf(out_file, "Dumping descriptor block, sequence %u, at "
 635                         "block %u:\n", transaction, blocknr);
 636
 637         ++blocknr;
 638         WRAP(jsb, blocknr);
 639
 640         do {
 641                 /* Work out the location of the current tag, and skip to
 642                  * the next one... */
 643                 tagp = &buf[offset];
 644                 tag = (journal_block_tag_t *) tagp;
 645                 offset += tag_size;
 646
 647                 /* ... and if we have gone too far, then we've reached the
 648                    end of this block. */
 649                 if (offset > blocksize - csum_size)
 650                         break;
 651
 652                 tag_block = be32_to_cpu(tag->t_blocknr);
 653                 tag_flags = be16_to_cpu(tag->t_flags);
 654
 655                 if (!(tag_flags & JBD2_FLAG_SAME_UUID))
 656                         offset += 16;
 657
 658                 dump_metadata_block(out_file, source, jsb,
 659                                     blocknr, tag_block, tag_flags, blocksize,
 660                                     transaction);
 661
 662                 ++blocknr;
 663                 WRAP(jsb, blocknr);
 664
 665         } while (!(tag_flags & JBD2_FLAG_LAST_TAG));
 666
 667         *blockp = blocknr;
 668 }
 669
 670
 671 static void dump_revoke_block(FILE *out_file, char *buf,
 672                               journal_superblock_t *jsb EXT2FS_ATTR((unused)),
 673                               unsigned int blocknr,
 674                               int blocksize EXT2FS_ATTR((unused)),
 675                               tid_t transaction)
 676 {
 677         int                     offset, max;
 678         jbd2_journal_revoke_header_t *header;
 679         unsigned long long      rblock;
 680         int                     tag_size = sizeof(__u32);
 681
 682         if (dump_all)
 683                 fprintf(out_file, "Dumping revoke block, sequence %u, at "
 684                         "block %u:\n", transaction, blocknr);
 685
 686         if (be32_to_cpu(jsb->s_feature_incompat) & JBD2_FEATURE_INCOMPAT_64BIT)
 687                 tag_size = sizeof(__u64);
 688
 689         header = (jbd2_journal_revoke_header_t *) buf;
 690         offset = sizeof(jbd2_journal_revoke_header_t);
 691         max = be32_to_cpu(header->r_count);
 692
 693         while (offset < max) {
 694                 if (tag_size == sizeof(__u32)) {
 695                         __u32 *entry = (__u32 *) (buf + offset);
 696                         rblock = be32_to_cpu(*entry);
 697                 } else {
 698                         __u64 *entry = (__u64 *) (buf + offset);
 699                         rblock = ext2fs_be64_to_cpu(*entry);
 700                 }
 701                 if (dump_all || rblock == block_to_dump) {
 702                         fprintf(out_file, "  Revoke FS block %llu", rblock);
 703                         if (dump_all)
 704                                 fprintf(out_file, "\n");
 705                         else
 706                                 fprintf(out_file," at block %u, sequence %u\n",
 707                                         blocknr, transaction);
 708                 }
 709                 offset += tag_size;
 710         }
 711 }
 712
 713
 714 static void show_extent(FILE *out_file, int start_extent, int end_extent,
 715                         __u32 first_block)
 716 {
 717         if (start_extent >= 0 && first_block != 0)
 718                 fprintf(out_file, "(%d+%u): %u ",
 719                         start_extent, end_extent-start_extent, first_block);
 720 }
 721
 722 static void show_indirect(FILE *out_file, const char *name, __u32 where)
 723 {
 724         if (where)
 725                 fprintf(out_file, "(%s): %u ", name, where);
 726 }
 727
 728
 729 static void dump_metadata_block(FILE *out_file, struct journal_source *source,
 730                                 journal_superblock_t *jsb EXT2FS_ATTR((unused)),
 731                                 unsigned int log_blocknr,
 732                                 unsigned int fs_blocknr,
 733                                 unsigned int log_tag_flags,
 734                                 int blocksize,
 735                                 tid_t transaction)
 736 {
 737         int             retval;
 738         char            buf[8192];
 739
 740         if (!(dump_all
 741               || (fs_blocknr == block_to_dump)
 742               || (fs_blocknr == inode_block_to_dump)
 743               || (fs_blocknr == bitmap_to_dump)))
 744                 return;
 745
 746         fprintf(out_file, "  FS block %u logged at ", fs_blocknr);
 747         if (!dump_all)
 748                 fprintf(out_file, "sequence %u, ", transaction);
 749         fprintf(out_file, "journal block %u (flags 0x%x)\n", log_blocknr,
 750                 log_tag_flags);
 751
 752         /* There are two major special cases to parse:
 753          *
 754          * If this block is a block
 755          * bitmap block, we need to give it special treatment so that we
 756          * can log any allocates and deallocates which affect the
 757          * block_to_dump query block.
 758          *
 759          * If the block is an inode block for the inode being searched
 760          * for, then we need to dump the contents of that inode
 761          * structure symbolically.
 762          */
 763
 764         if (!(dump_contents && dump_all)
 765             && fs_blocknr != block_to_dump
 766             && fs_blocknr != bitmap_to_dump
 767             && fs_blocknr != inode_block_to_dump)
 768                 return;
 769
 770         retval = read_journal_block("logdump", source,
 771                                     ((ext2_loff_t) log_blocknr) * blocksize,
 772                                     buf, blocksize);
 773         if (retval)
 774                 return;
 775
 776         if (fs_blocknr == bitmap_to_dump) {
 777                 struct ext2_super_block *super;
 778                 int offset;
 779
 780                 super = current_fs->super;
 781                 offset = ((block_to_dump - super->s_first_data_block) %
 782                           super->s_blocks_per_group);
 783
 784                 fprintf(out_file, "    (block bitmap for block %llu: "
 785                         "block is %s)\n",
 786                         block_to_dump,
 787                         ext2fs_test_bit(offset, buf) ? "SET" : "CLEAR");
 788         }
 789
 790         if (fs_blocknr == inode_block_to_dump) {
 791                 struct ext2_inode *inode;
 792                 int first, prev, this, start_extent, i;
 793
 794                 fprintf(out_file, "    (inode block for inode %u):\n",
 795                         inode_to_dump);
 796
 797                 inode = (struct ext2_inode *) (buf + inode_offset_to_dump);
 798                 internal_dump_inode(out_file, "    ", inode_to_dump, inode, 0);
 799
 800                 /* Dump out the direct/indirect blocks here:
 801                  * internal_dump_inode can only dump them from the main
 802                  * on-disk inode, not from the journaled copy of the
 803                  * inode. */
 804
 805                 fprintf (out_file, "    Blocks:  ");
 806                 first = prev = start_extent = -1;
 807
 808                 for (i=0; i<EXT2_NDIR_BLOCKS; i++) {
 809                         this = inode->i_block[i];
 810                         if (start_extent >= 0  && this == prev+1) {
 811                                 prev = this;
 812                                 continue;
 813                         } else {
 814                                 show_extent(out_file, start_extent, i, first);
 815                                 start_extent = i;
 816                                 first = prev = this;
 817                         }
 818                 }
 819                 show_extent(out_file, start_extent, i, first);
 820                 show_indirect(out_file, "IND", inode->i_block[i++]);
 821                 show_indirect(out_file, "DIND", inode->i_block[i++]);
 822                 show_indirect(out_file, "TIND", inode->i_block[i++]);
 823
 824                 fprintf(out_file, "\n");
 825         }
 826
 827         if (dump_contents)
 828                 do_hexdump(out_file, buf, blocksize);
 829
 830 }
 831
 832 static void do_hexdump (FILE *out_file, char *buf, int blocksize)
 833 {
 834         int i,j;
 835         int *intp;
 836         char *charp;
 837         unsigned char c;
 838
 839         intp = (int *) buf;
 840         charp = (char *) buf;
 841
 842         for (i=0; i<blocksize; i+=16) {
 843                 fprintf(out_file, "    %04x:  ", i);
 844                 for (j=0; j<16; j+=4)
 845                         fprintf(out_file, "%08x ", *intp++);
 846                 for (j=0; j<16; j++) {
 847                         c = *charp++;
 848                         if (c < ' ' || c >= 127)
 849                                 c = '.';
 850                         fprintf(out_file, "%c", c);
 851                 }
 852                 fprintf(out_file, "\n");
 853         }
 854 }
 855