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 #if __GNUC_PREREQ (4, 6)
  37 #pragma GCC diagnostic push
  38 #pragma GCC diagnostic ignored "-Wunused-function"
  39 #endif
  40 #include "ext2fs/fast_commit.h"
  41 #if __GNUC_PREREQ (4, 6)
  42 #pragma GCC diagnostic pop
  43 #endif
  44 #include <uuid/uuid.h>
  45
  46 enum journal_location {JOURNAL_IS_INTERNAL, JOURNAL_IS_EXTERNAL};
  47
  48 #define ANY_BLOCK ((blk64_t) -1)
  49
  50 static int              dump_all, dump_super, dump_old, dump_contents, dump_descriptors;
  51 static int64_t          dump_counts;
  52 static blk64_t          block_to_dump, bitmap_to_dump, inode_block_to_dump;
  53 static unsigned int     group_to_dump, inode_offset_to_dump;
  54 static ext2_ino_t       inode_to_dump;
  55
  56 struct journal_source
  57 {
  58         enum journal_location where;
  59         int fd;
  60         ext2_file_t file;
  61 };
  62
  63 static void dump_journal(char *, FILE *, struct journal_source *);
  64
  65 static void dump_descriptor_block(FILE *, struct journal_source *,
  66                                   char *, journal_superblock_t *,
  67                                   unsigned int *, unsigned int, __u32, tid_t);
  68
  69 static void dump_revoke_block(FILE *, char *, journal_superblock_t *,
  70                                   unsigned int, unsigned int, tid_t);
  71
  72 static void dump_metadata_block(FILE *, struct journal_source *,
  73                                 journal_superblock_t*,
  74                                 unsigned int, unsigned int, unsigned int,
  75                                 unsigned int, tid_t);
  76
  77 static void dump_fc_block(FILE *out_file, char *buf, int blocksize,
  78                           tid_t transaction, int *fc_done);
  79
  80 static void do_hexdump (FILE *, char *, int);
  81
  82 #define WRAP(jsb, blocknr, maxlen)                                      \
  83         if (blocknr >= (maxlen))                                        \
  84             blocknr -= (maxlen - be32_to_cpu((jsb)->s_first));
  85
  86 void do_logdump(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
  87                     void *infop EXT2FS_ATTR((unused)))
  88 {
  89         int             c;
  90         int             retval;
  91         char            *out_fn;
  92         FILE            *out_file;
  93
  94         char            *inode_spec = NULL;
  95         char            *journal_fn = NULL;
  96         int             journal_fd = -1;
  97         int             use_sb = 0;
  98         ext2_ino_t      journal_inum;
  99         struct ext2_inode journal_inode;
 100         ext2_file_t     journal_file = NULL;
 101         char            *tmp;
 102         struct journal_source journal_source;
 103         struct ext2_super_block *es = NULL;
 104
 105         journal_source.where = JOURNAL_IS_INTERNAL;
 106         journal_source.fd = 0;
 107         journal_source.file = 0;
 108         dump_all = 0;
 109         dump_old = 0;
 110         dump_contents = 0;
 111         dump_super = 0;
 112         dump_descriptors = 1;
 113         block_to_dump = ANY_BLOCK;
 114         bitmap_to_dump = -1;
 115         inode_block_to_dump = ANY_BLOCK;
 116         inode_to_dump = -1;
 117         dump_counts = -1;
 118
 119         reset_getopt();
 120         while ((c = getopt (argc, argv, "ab:ci:f:OsSn:")) != EOF) {
 121                 switch (c) {
 122                 case 'a':
 123                         dump_all++;
 124                         break;
 125                 case 'b':
 126                         block_to_dump = strtoul(optarg, &tmp, 0);
 127                         if (*tmp) {
 128                                 com_err(argv[0], 0,
 129                                         "Bad block number - %s", optarg);
 130                                 return;
 131                         }
 132                         dump_descriptors = 0;
 133                         break;
 134                 case 'c':
 135                         dump_contents++;
 136                         break;
 137                 case 'f':
 138                         journal_fn = optarg;
 139                         break;
 140                 case 'i':
 141                         inode_spec = optarg;
 142                         dump_descriptors = 0;
 143                         break;
 144                 case 'O':
 145                         dump_old++;
 146                         break;
 147                 case 's':
 148                         use_sb++;
 149                         break;
 150                 case 'S':
 151                         dump_super++;
 152                         break;
 153                 case 'n':
 154                         dump_counts = strtol(optarg, &tmp, 10);
 155                         if (*tmp) {
 156                                 com_err(argv[0], 0,
 157                                         "Bad log counts number - %s", optarg);
 158                                 return;
 159                         }
 160                         break;
 161                 default:
 162                         goto print_usage;
 163                 }
 164         }
 165         if (optind != argc && optind != argc-1) {
 166                 goto print_usage;
 167         }
 168
 169         if (inode_spec) {
 170                 int inode_group, group_offset, inodes_per_block;
 171
 172                 if (check_fs_open(argv[0]))
 173                         return;
 174
 175                 inode_to_dump = string_to_inode(inode_spec);
 176                 if (!inode_to_dump)
 177                         return;
 178
 179                 es = current_fs->super;
 180                 inode_group = ((inode_to_dump - 1)
 181                                / es->s_inodes_per_group);
 182                 group_offset = ((inode_to_dump - 1)
 183                                 % es->s_inodes_per_group);
 184                 inodes_per_block = (current_fs->blocksize
 185                                     / sizeof(struct ext2_inode));
 186
 187                 inode_block_to_dump =
 188                         ext2fs_inode_table_loc(current_fs, inode_group) +
 189                         (group_offset / inodes_per_block);
 190                 inode_offset_to_dump = ((group_offset % inodes_per_block)
 191                                         * sizeof(struct ext2_inode));
 192                 printf("Inode %u is at group %u, block %llu, offset %u\n",
 193                        inode_to_dump, inode_group,
 194                        (unsigned long long) inode_block_to_dump,
 195                        inode_offset_to_dump);
 196         }
 197
 198         if (optind == argc) {
 199                 out_file = stdout;
 200         } else {
 201                 out_fn = argv[optind];
 202                 out_file = fopen(out_fn, "w");
 203                 if (!out_file) {
 204                         com_err(argv[0], errno, "while opening %s for logdump",
 205                                 out_fn);
 206                         goto cleanup;
 207                 }
 208         }
 209
 210         if (block_to_dump != ANY_BLOCK) {
 211                 if (check_fs_open(argv[0]))
 212                         goto cleanup;
 213                 es = current_fs->super;
 214                 group_to_dump = ((block_to_dump -
 215                                   es->s_first_data_block)
 216                                  / es->s_blocks_per_group);
 217                 bitmap_to_dump = ext2fs_block_bitmap_loc(current_fs, group_to_dump);
 218         }
 219
 220         if (journal_fn) {
 221                 /* Set up to read journal from a regular file somewhere */
 222                 journal_fd = open(journal_fn, O_RDONLY, 0);
 223                 if (journal_fd < 0) {
 224                         com_err(argv[0], errno, "while opening %s for logdump",
 225                                 journal_fn);
 226                         goto cleanup;
 227                 }
 228                 journal_source.where = JOURNAL_IS_EXTERNAL;
 229                 journal_source.fd = journal_fd;
 230                 dump_journal(argv[0], out_file, &journal_source);
 231                 goto cleanup;
 232
 233         }
 234         if (check_fs_open(argv[0]))
 235                 goto cleanup;
 236         es = current_fs->super;
 237
 238         if ((journal_inum = es->s_journal_inum)) {
 239                 if (use_sb) {
 240                         if (es->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS) {
 241                                 com_err(argv[0], 0,
 242                                         "no journal backup in super block\n");
 243                                 goto cleanup;
 244                         }
 245                         memset(&journal_inode, 0, sizeof(struct ext2_inode));
 246                         memcpy(&journal_inode.i_block[0], es->s_jnl_blocks,
 247                                EXT2_N_BLOCKS*4);
 248                         journal_inode.i_size_high = es->s_jnl_blocks[15];
 249                         journal_inode.i_size = es->s_jnl_blocks[16];
 250                         journal_inode.i_links_count = 1;
 251                         journal_inode.i_mode = LINUX_S_IFREG | 0600;
 252                 } else {
 253                         if (debugfs_read_inode(journal_inum, &journal_inode,
 254                                                argv[0]))
 255                                 goto cleanup;
 256                 }
 257
 258                 retval = ext2fs_file_open2(current_fs, journal_inum,
 259                                            &journal_inode, 0, &journal_file);
 260                 if (retval) {
 261                         com_err(argv[0], retval, "while opening ext2 file");
 262                         goto cleanup;
 263                 }
 264                 journal_source.where = JOURNAL_IS_INTERNAL;
 265                 journal_source.file = journal_file;
 266         } else {
 267                 char uuid[37];
 268
 269                 uuid_unparse(es->s_journal_uuid, uuid);
 270                 journal_fn = blkid_get_devname(NULL, "UUID", uuid);
 271                 if (!journal_fn)
 272                                 journal_fn = blkid_devno_to_devname(es->s_journal_dev);
 273                 if (!journal_fn) {
 274                         com_err(argv[0], 0, "filesystem has no journal");
 275                         goto cleanup;
 276                 }
 277                 journal_fd = open(journal_fn, O_RDONLY, 0);
 278                 if (journal_fd < 0) {
 279                         com_err(argv[0], errno, "while opening %s for logdump",
 280                                 journal_fn);
 281                         free(journal_fn);
 282                         goto cleanup;
 283                 }
 284                 fprintf(out_file, "Using external journal found at %s\n",
 285                         journal_fn);
 286                 free(journal_fn);
 287                 journal_source.where = JOURNAL_IS_EXTERNAL;
 288                 journal_source.fd = journal_fd;
 289         }
 290         dump_journal(argv[0], out_file, &journal_source);
 291 cleanup:
 292         if (journal_fd >= 0)
 293                 close(journal_fd);
 294         if (journal_file)
 295                 ext2fs_file_close(journal_file);
 296         if (out_file && (out_file != stdout))
 297                 fclose(out_file);
 298
 299         return;
 300
 301 print_usage:
 302         fprintf(stderr, "%s: Usage: logdump [-acsOS] [-n<num_trans>] [-b<block>] [-i<filespec>]\n\t"
 303                 "[-f<journal_file>] [output_file]\n", argv[0]);
 304 }
 305
 306
 307 static int read_journal_block(const char *cmd, struct journal_source *source,
 308                               ext2_loff_t offset, char *buf, unsigned int size)
 309 {
 310         int retval;
 311         unsigned int got;
 312
 313         if (source->where == JOURNAL_IS_EXTERNAL) {
 314                 if (lseek(source->fd, offset, SEEK_SET) < 0) {
 315                         retval = errno;
 316                         goto seek_err;
 317                 }
 318                 retval = read(source->fd, buf, size);
 319                 if (retval < 0) {
 320                         retval = errno;
 321                         goto read_err;
 322                 }
 323                 got = retval;
 324                 retval = 0;
 325         } else {
 326                 retval = ext2fs_file_llseek(source->file, offset,
 327                                             EXT2_SEEK_SET, NULL);
 328                 if (retval) {
 329                 seek_err:
 330                         com_err(cmd, retval, "while seeking in reading journal");
 331                         return retval;
 332                 }
 333                 retval = ext2fs_file_read(source->file, buf, size, &got);
 334                 if (retval) {
 335                 read_err:
 336                         com_err(cmd, retval, "while reading journal");
 337                         return retval;
 338                 }
 339         }
 340         if (got != size) {
 341                 com_err(cmd, 0, "short read (read %u, expected %u) "
 342                         "while reading journal", got, size);
 343                 retval = -1;
 344         }
 345         return retval;
 346 }
 347
 348 static const char *type_to_name(int btype)
 349 {
 350         switch (btype) {
 351         case JBD2_DESCRIPTOR_BLOCK:
 352                 return "descriptor block";
 353         case JBD2_COMMIT_BLOCK:
 354                 return "commit block";
 355         case JBD2_SUPERBLOCK_V1:
 356                 return "V1 superblock";
 357         case JBD2_SUPERBLOCK_V2:
 358                 return "V2 superblock";
 359         case JBD2_REVOKE_BLOCK:
 360                 return "revoke table";
 361         }
 362         return "unrecognised type";
 363 }
 364
 365
 366 static void dump_journal(char *cmdname, FILE *out_file,
 367                          struct journal_source *source)
 368 {
 369         struct ext2_super_block *sb;
 370         char                    jsb_buffer[1024];
 371         char                    buf[EXT2_MAX_BLOCK_SIZE];
 372         journal_superblock_t    *jsb;
 373         unsigned int            blocksize = 1024;
 374         int                     retval;
 375         __u32                   magic, sequence, blocktype;
 376         journal_header_t        *header;
 377         tid_t                   transaction;
 378         unsigned int            blocknr = 0;
 379         unsigned int            first_transaction_blocknr;
 380         int                     fc_done;
 381         __u64                   total_len;
 382         __u32                   maxlen;
 383         int64_t                 cur_counts = 0;
 384         bool                    exist_no_magic = false;
 385
 386         /* First, check to see if there's an ext2 superblock header */
 387         retval = read_journal_block(cmdname, source, 0, buf, 2048);
 388         if (retval)
 389                 return;
 390
 391         jsb = (journal_superblock_t *) buf;
 392         sb = (struct ext2_super_block *) (buf+1024);
 393 #ifdef WORDS_BIGENDIAN
 394         if (sb->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
 395                 ext2fs_swap_super(sb);
 396 #endif
 397
 398         if ((be32_to_cpu(jsb->s_header.h_magic) != JBD2_MAGIC_NUMBER) &&
 399             (sb->s_magic == EXT2_SUPER_MAGIC) &&
 400             ext2fs_has_feature_journal_dev(sb)) {
 401                 blocksize = EXT2_BLOCK_SIZE(sb);
 402                 blocknr = (blocksize == 1024) ? 2 : 1;
 403                 uuid_unparse(sb->s_uuid, jsb_buffer);
 404                 fprintf(out_file, "Ext2 superblock header found.\n");
 405                 if (dump_all) {
 406                         fprintf(out_file, "\tuuid=%s\n", jsb_buffer);
 407                         fprintf(out_file, "\tblocksize=%d\n", blocksize);
 408                         fprintf(out_file, "\tjournal data size %lu\n",
 409                                 (unsigned long) ext2fs_blocks_count(sb));
 410                 }
 411         }
 412
 413         /* Next, read the journal superblock */
 414         retval = read_journal_block(cmdname, source,
 415                                     ((ext2_loff_t) blocknr) * blocksize,
 416                                     jsb_buffer, 1024);
 417         if (retval)
 418                 return;
 419
 420         if (dump_super) {
 421                 e2p_list_journal_super(out_file, jsb_buffer,
 422                                        current_fs->blocksize, 0);
 423                 fputc('\n', out_file);
 424         }
 425
 426         jsb = (journal_superblock_t *) jsb_buffer;
 427         if (be32_to_cpu(jsb->s_header.h_magic) != JBD2_MAGIC_NUMBER) {
 428                 fprintf(out_file,
 429                         "Journal superblock magic number invalid!\n");
 430                 return;
 431         }
 432         blocksize = be32_to_cpu(jsb->s_blocksize);
 433         if ((current_fs && (blocksize != current_fs->blocksize)) ||
 434             (!current_fs && (!blocksize || (blocksize & (blocksize - 1)) ||
 435                              (blocksize > EXT2_MAX_BLOCK_SIZE)))) {
 436                 fprintf(out_file,
 437                         "Journal block size invalid: %u (%u)\n",
 438                         be32_to_cpu(jsb->s_blocksize), blocksize);
 439                 return;
 440         }
 441         transaction = be32_to_cpu(jsb->s_sequence);
 442         blocknr = be32_to_cpu(jsb->s_start);
 443         if (source->where == JOURNAL_IS_INTERNAL) {
 444                 retval = ext2fs_file_get_lsize(source->file, &total_len);
 445                 if (retval) {
 446                 stat_err:
 447                         com_err("dump_journal", retval,
 448                                 "while getting journal inode size");
 449                         return;
 450                 }
 451                 total_len /= blocksize;
 452         } else {
 453                         struct stat st;
 454
 455                         if (fstat(source->fd, &st) < 0)
 456                                 goto stat_err;
 457                         total_len = st.st_size / blocksize;
 458         }
 459         maxlen = be32_to_cpu(jsb->s_maxlen);
 460         if (maxlen > total_len)
 461                 maxlen = total_len;
 462
 463         fprintf(out_file, "Journal starts at block %u, transaction %u\n",
 464                 blocknr, transaction);
 465
 466         if (!blocknr) {
 467                 /* Empty journal, nothing to do. */
 468                 if (!dump_old)
 469                         goto fc;
 470                 else
 471                         blocknr = 1;
 472         }
 473
 474         first_transaction_blocknr = blocknr;
 475
 476         while (1) {
 477                 if (dump_old && (dump_counts != -1) && (cur_counts >= dump_counts))
 478                         break;
 479
 480                 if ((blocknr == first_transaction_blocknr) &&
 481                     (cur_counts != 0) && dump_old && (dump_counts != -1)) {
 482                         fprintf(out_file, "Dump all %lld journal records.\n",
 483                                 (long long) cur_counts);
 484                         break;
 485                 }
 486
 487                 retval = read_journal_block(cmdname, source,
 488                                 ((ext2_loff_t) blocknr) * blocksize,
 489                                 buf, blocksize);
 490                 if (retval)
 491                         break;
 492
 493                 header = (journal_header_t *) buf;
 494
 495                 magic = be32_to_cpu(header->h_magic);
 496                 sequence = be32_to_cpu(header->h_sequence);
 497                 blocktype = be32_to_cpu(header->h_blocktype);
 498
 499                 if (magic != JBD2_MAGIC_NUMBER) {
 500                         if (exist_no_magic == false) {
 501                                 exist_no_magic = true;
 502                                 fprintf(out_file, "No magic number at block %u: "
 503                                         "end of journal.\n", blocknr);
 504                         }
 505                         if (dump_old && (dump_counts != -1)) {
 506                                 blocknr++;
 507                                 WRAP(jsb, blocknr, maxlen);
 508                                 continue;
 509                         }
 510                         break;
 511                 }
 512
 513                 if (sequence != transaction) {
 514                         fprintf (out_file, "Found sequence %u (not %u) at "
 515                                  "block %u: end of journal.\n",
 516                                  sequence, transaction, blocknr);
 517                         if (!dump_old)
 518                                 break;
 519                 }
 520
 521                 if (dump_descriptors) {
 522                         fprintf (out_file, "Found expected sequence %u, "
 523                                  "type %u (%s) at block %u\n",
 524                                  sequence, blocktype,
 525                                  type_to_name(blocktype), blocknr);
 526                 }
 527
 528                 switch (blocktype) {
 529                 case JBD2_DESCRIPTOR_BLOCK:
 530                         dump_descriptor_block(out_file, source, buf, jsb,
 531                                               &blocknr, blocksize, maxlen,
 532                                               transaction);
 533                         continue;
 534
 535                 case JBD2_COMMIT_BLOCK:
 536                         cur_counts++;
 537                         transaction++;
 538                         blocknr++;
 539                         WRAP(jsb, blocknr, maxlen);
 540                         continue;
 541
 542                 case JBD2_REVOKE_BLOCK:
 543                         dump_revoke_block(out_file, buf, jsb,
 544                                           blocknr, blocksize,
 545                                           transaction);
 546                         blocknr++;
 547                         WRAP(jsb, blocknr, maxlen);
 548                         continue;
 549
 550                 default:
 551                         fprintf (out_file, "Unexpected block type %u at "
 552                                  "block %u.\n", blocktype, blocknr);
 553                         break;
 554                 }
 555         }
 556
 557 fc:
 558         blocknr = maxlen - jbd2_journal_get_num_fc_blks(jsb) + 1;
 559         while (blocknr <= maxlen) {
 560                 retval = read_journal_block(cmdname, source,
 561                                 ((ext2_loff_t) blocknr) * blocksize,
 562                                 buf, blocksize);
 563                 if (retval)
 564                         return;
 565
 566                 dump_fc_block(out_file, buf, blocksize, transaction, &fc_done);
 567                 if (!dump_old && fc_done)
 568                         break;
 569                 blocknr++;
 570         }
 571 }
 572
 573 static inline size_t journal_super_tag_bytes(journal_superblock_t *jsb)
 574 {
 575         size_t sz;
 576
 577         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JBD2_FEATURE_INCOMPAT_CSUM_V3))
 578                 return sizeof(journal_block_tag3_t);
 579
 580         sz = sizeof(journal_block_tag_t);
 581
 582         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JBD2_FEATURE_INCOMPAT_CSUM_V2))
 583                 sz += sizeof(__u16);
 584
 585         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JBD2_FEATURE_INCOMPAT_64BIT))
 586                 return sz;
 587
 588         return sz - sizeof(__u32);
 589 }
 590
 591 static void dump_fc_block(FILE *out_file, char *buf, int blocksize,
 592                           tid_t transaction, int *fc_done)
 593 {
 594         struct ext4_fc_tl       tl;
 595         struct ext4_fc_head     *head;
 596         struct ext4_fc_add_range        *add_range;
 597         struct ext4_fc_del_range        *del_range;
 598         struct ext4_fc_dentry_info      *dentry_info;
 599         struct ext4_fc_tail             *tail;
 600         struct ext3_extent      *ex;
 601         __u8                    *cur, *val;
 602
 603         *fc_done = 0;
 604         for (cur = (__u8 *)buf; cur < (__u8 *)buf + blocksize;
 605              cur = cur + sizeof(tl) + le16_to_cpu(tl.fc_len)) {
 606                 memcpy(&tl, cur, sizeof(tl));
 607                 val = cur + sizeof(tl);
 608
 609                 switch (le16_to_cpu(tl.fc_tag)) {
 610                 case EXT4_FC_TAG_ADD_RANGE:
 611                         add_range = (struct ext4_fc_add_range *)val;
 612                         ex = (struct ext3_extent *)add_range->fc_ex;
 613                         fprintf(out_file,
 614                                 "tag %s, inode %d, lblk %u, pblk %llu, len %lu\n",
 615                                 tag2str(tl.fc_tag),
 616                                 le32_to_cpu(add_range->fc_ino),
 617                                 le32_to_cpu(ex->ee_block),
 618                                 le32_to_cpu(ex->ee_start) +
 619                                 (((unsigned long long) le16_to_cpu(ex->ee_start_hi)) << 32),
 620                                 le16_to_cpu(ex->ee_len) > EXT_INIT_MAX_LEN ?
 621                                 le16_to_cpu(ex->ee_len) - EXT_INIT_MAX_LEN :
 622                                 le16_to_cpu(ex->ee_len));
 623                         break;
 624                 case EXT4_FC_TAG_DEL_RANGE:
 625                         del_range = (struct ext4_fc_del_range *)val;
 626                         fprintf(out_file, "tag %s, inode %d, lblk %d, len %d\n",
 627                                 tag2str(tl.fc_tag),
 628                                 le32_to_cpu(del_range->fc_ino),
 629                                 le32_to_cpu(del_range->fc_lblk),
 630                                 le32_to_cpu(del_range->fc_len));
 631                         break;
 632                 case EXT4_FC_TAG_LINK:
 633                 case EXT4_FC_TAG_UNLINK:
 634                 case EXT4_FC_TAG_CREAT:
 635                         dentry_info = (struct ext4_fc_dentry_info *)val;
 636                         fprintf(out_file,
 637                                 "tag %s, parent %d, ino %d, name \"%s\"\n",
 638                                 tag2str(tl.fc_tag),
 639                                 le32_to_cpu(dentry_info->fc_parent_ino),
 640                                 le32_to_cpu(dentry_info->fc_ino),
 641                                 dentry_info->fc_dname);
 642                         break;
 643                 case EXT4_FC_TAG_INODE:
 644                         fprintf(out_file, "tag %s, inode %d\n",
 645                                 tag2str(tl.fc_tag),
 646                                 le32_to_cpu(((struct ext4_fc_inode *)val)->fc_ino));
 647                         break;
 648                 case EXT4_FC_TAG_PAD:
 649                         fprintf(out_file, "tag %s\n", tag2str(tl.fc_tag));
 650                         break;
 651                 case EXT4_FC_TAG_TAIL:
 652                         tail = (struct ext4_fc_tail *)val;
 653                         fprintf(out_file, "tag %s, tid %d\n",
 654                                 tag2str(tl.fc_tag),
 655                                 le32_to_cpu(tail->fc_tid));
 656                         if (!dump_old &&
 657                                 le32_to_cpu(tail->fc_tid) < transaction) {
 658                                 *fc_done = 1;
 659                                 return;
 660                         }
 661                         break;
 662                 case EXT4_FC_TAG_HEAD:
 663                         fprintf(out_file, "\n*** Fast Commit Area ***\n");
 664                         head = (struct ext4_fc_head *)val;
 665                         fprintf(out_file, "tag %s, features 0x%x, tid %d\n",
 666                                 tag2str(tl.fc_tag),
 667                                 le32_to_cpu(head->fc_features),
 668                                 le32_to_cpu(head->fc_tid));
 669                         if (!dump_old &&
 670                                 le32_to_cpu(head->fc_tid) < transaction) {
 671                                 *fc_done = 1;
 672                                 return;
 673                         }
 674                         break;
 675                 default:
 676                         *fc_done = 1;
 677                         break;
 678                 }
 679         }
 680 }
 681
 682 static void dump_descriptor_block(FILE *out_file,
 683                                   struct journal_source *source,
 684                                   char *buf,
 685                                   journal_superblock_t *jsb,
 686                                   unsigned int *blockp, unsigned blocksize,
 687                                   __u32 maxlen,
 688                                   tid_t transaction)
 689 {
 690         unsigned                offset, tag_size, csum_size = 0;
 691         char                    *tagp;
 692         journal_block_tag_t     *tag;
 693         unsigned int            blocknr;
 694         __u32                   tag_block;
 695         __u32                   tag_flags;
 696
 697         tag_size = journal_super_tag_bytes(jsb);
 698         offset = sizeof(journal_header_t);
 699         blocknr = *blockp;
 700
 701         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JBD2_FEATURE_INCOMPAT_CSUM_V3) ||
 702             JSB_HAS_INCOMPAT_FEATURE(jsb, JBD2_FEATURE_INCOMPAT_CSUM_V2))
 703                 csum_size = sizeof(struct jbd2_journal_block_tail);
 704
 705         if (dump_all)
 706                 fprintf(out_file, "Dumping descriptor block, sequence %u, at "
 707                         "block %u:\n", transaction, blocknr);
 708
 709         ++blocknr;
 710         WRAP(jsb, blocknr, maxlen);
 711
 712         do {
 713                 /* Work out the location of the current tag, and skip to
 714                  * the next one... */
 715                 tagp = &buf[offset];
 716                 tag = (journal_block_tag_t *) tagp;
 717                 offset += tag_size;
 718
 719                 /* ... and if we have gone too far, then we've reached the
 720                    end of this block. */
 721                 if (offset > blocksize - csum_size)
 722                         break;
 723
 724                 tag_block = be32_to_cpu(tag->t_blocknr);
 725                 tag_flags = be16_to_cpu(tag->t_flags);
 726
 727                 if (!(tag_flags & JBD2_FLAG_SAME_UUID))
 728                         offset += 16;
 729
 730                 dump_metadata_block(out_file, source, jsb,
 731                                     blocknr, tag_block, tag_flags, blocksize,
 732                                     transaction);
 733
 734                 ++blocknr;
 735                 WRAP(jsb, blocknr, maxlen);
 736
 737         } while (!(tag_flags & JBD2_FLAG_LAST_TAG));
 738
 739         *blockp = blocknr;
 740 }
 741
 742
 743 static void dump_revoke_block(FILE *out_file, char *buf,
 744                               journal_superblock_t *jsb EXT2FS_ATTR((unused)),
 745                               unsigned int blocknr,
 746                               unsigned int blocksize,
 747                               tid_t transaction)
 748 {
 749         unsigned int            offset, max;
 750         jbd2_journal_revoke_header_t *header;
 751         unsigned long long      rblock;
 752         int                     tag_size = sizeof(__u32);
 753
 754         if (dump_all)
 755                 fprintf(out_file, "Dumping revoke block, sequence %u, at "
 756                         "block %u:\n", transaction, blocknr);
 757
 758         if (be32_to_cpu(jsb->s_feature_incompat) & JBD2_FEATURE_INCOMPAT_64BIT)
 759                 tag_size = sizeof(__u64);
 760
 761         header = (jbd2_journal_revoke_header_t *) buf;
 762         offset = sizeof(jbd2_journal_revoke_header_t);
 763         max = be32_to_cpu(header->r_count);
 764         if (max > blocksize) {
 765                 fprintf(out_file, "Revoke block's r_count invalid: %u\b",
 766                         max);
 767                 max = blocksize;
 768         }
 769
 770         while (offset < max) {
 771                 if (tag_size == sizeof(__u32)) {
 772                         __u32 *entry = (__u32 *) (buf + offset);
 773                         rblock = be32_to_cpu(*entry);
 774                 } else {
 775                         __u64 *entry = (__u64 *) (buf + offset);
 776                         rblock = ext2fs_be64_to_cpu(*entry);
 777                 }
 778                 if (dump_all || rblock == block_to_dump) {
 779                         fprintf(out_file, "  Revoke FS block %llu",
 780                                 (unsigned long long) rblock);
 781                         if (dump_all)
 782                                 fprintf(out_file, "\n");
 783                         else
 784                                 fprintf(out_file," at block %u, sequence %u\n",
 785                                         blocknr, transaction);
 786                 }
 787                 offset += tag_size;
 788         }
 789 }
 790
 791
 792 static void show_extent(FILE *out_file, int start_extent, int end_extent,
 793                         __u32 first_block)
 794 {
 795         if (start_extent >= 0 && first_block != 0)
 796                 fprintf(out_file, "(%d+%u): %u ",
 797                         start_extent, end_extent-start_extent, first_block);
 798 }
 799
 800 static void show_indirect(FILE *out_file, const char *name, __u32 where)
 801 {
 802         if (where)
 803                 fprintf(out_file, "(%s): %u ", name, where);
 804 }
 805
 806
 807 static void dump_metadata_block(FILE *out_file, struct journal_source *source,
 808                                 journal_superblock_t *jsb EXT2FS_ATTR((unused)),
 809                                 unsigned int log_blocknr,
 810                                 unsigned int fs_blocknr,
 811                                 unsigned int log_tag_flags,
 812                                 unsigned int blocksize,
 813                                 tid_t transaction)
 814 {
 815         int             retval;
 816         char            buf[EXT2_MAX_BLOCK_SIZE];
 817
 818         if (!(dump_all
 819               || (fs_blocknr == block_to_dump)
 820               || (fs_blocknr == inode_block_to_dump)
 821               || (fs_blocknr == bitmap_to_dump)))
 822                 return;
 823
 824         fprintf(out_file, "  FS block %u logged at ", fs_blocknr);
 825         if (!dump_all)
 826                 fprintf(out_file, "sequence %u, ", transaction);
 827         fprintf(out_file, "journal block %u (flags 0x%x)\n", log_blocknr,
 828                 log_tag_flags);
 829
 830         /* There are two major special cases to parse:
 831          *
 832          * If this block is a block
 833          * bitmap block, we need to give it special treatment so that we
 834          * can log any allocates and deallocates which affect the
 835          * block_to_dump query block.
 836          *
 837          * If the block is an inode block for the inode being searched
 838          * for, then we need to dump the contents of that inode
 839          * structure symbolically.
 840          */
 841
 842         if (!(dump_contents && dump_all)
 843             && fs_blocknr != block_to_dump
 844             && fs_blocknr != bitmap_to_dump
 845             && fs_blocknr != inode_block_to_dump)
 846                 return;
 847
 848         retval = read_journal_block("logdump", source,
 849                                     ((ext2_loff_t) log_blocknr) * blocksize,
 850                                     buf, blocksize);
 851         if (retval)
 852                 return;
 853
 854         if (fs_blocknr == bitmap_to_dump) {
 855                 struct ext2_super_block *super;
 856                 int offset;
 857
 858                 super = current_fs->super;
 859                 offset = ((block_to_dump - super->s_first_data_block) %
 860                           super->s_blocks_per_group);
 861
 862                 fprintf(out_file, "    (block bitmap for block %llu: "
 863                         "block is %s)\n",
 864                         (unsigned long long) block_to_dump,
 865                         ext2fs_test_bit(offset, buf) ? "SET" : "CLEAR");
 866         }
 867
 868         if (fs_blocknr == inode_block_to_dump) {
 869                 struct ext2_inode *inode;
 870                 int first, prev, this, start_extent, i;
 871
 872                 fprintf(out_file, "    (inode block for inode %u):\n",
 873                         inode_to_dump);
 874
 875                 inode = (struct ext2_inode *) (buf + inode_offset_to_dump);
 876                 internal_dump_inode(out_file, "    ", inode_to_dump, inode, 0);
 877
 878                 /* Dump out the direct/indirect blocks here:
 879                  * internal_dump_inode can only dump them from the main
 880                  * on-disk inode, not from the journaled copy of the
 881                  * inode. */
 882
 883                 fprintf (out_file, "    Blocks:  ");
 884                 first = prev = start_extent = -1;
 885
 886                 for (i=0; i<EXT2_NDIR_BLOCKS; i++) {
 887                         this = inode->i_block[i];
 888                         if (start_extent >= 0  && this == prev+1) {
 889                                 prev = this;
 890                                 continue;
 891                         } else {
 892                                 show_extent(out_file, start_extent, i, first);
 893                                 start_extent = i;
 894                                 first = prev = this;
 895                         }
 896                 }
 897                 show_extent(out_file, start_extent, i, first);
 898                 show_indirect(out_file, "IND", inode->i_block[i++]);
 899                 show_indirect(out_file, "DIND", inode->i_block[i++]);
 900                 show_indirect(out_file, "TIND", inode->i_block[i++]);
 901
 902                 fprintf(out_file, "\n");
 903         }
 904
 905         if (dump_contents)
 906                 do_hexdump(out_file, buf, blocksize);
 907
 908 }
 909
 910 static void do_hexdump (FILE *out_file, char *buf, int blocksize)
 911 {
 912         int i,j;
 913         int *intp;
 914         char *charp;
 915         unsigned char c;
 916
 917         intp = (int *) buf;
 918         charp = (char *) buf;
 919
 920         for (i=0; i<blocksize; i+=16) {
 921                 fprintf(out_file, "    %04x:  ", i);
 922                 for (j=0; j<16; j+=4)
 923                         fprintf(out_file, "%08x ", *intp++);
 924                 for (j=0; j<16; j++) {
 925                         c = *charp++;
 926                         if (c < ' ' || c >= 127)
 927                                 c = '.';
 928                         fprintf(out_file, "%c", c);
 929                 }
 930                 fprintf(out_file, "\n");
 931         }
 932 }
 933