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, __u32, 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, maxlen)                                      \
  75         if (blocknr >= (maxlen))                                        \
  76             blocknr -= (maxlen - be32_to_cpu((jsb)->s_first));
  77
  78 void do_logdump(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
  79                     void *infop EXT2FS_ATTR((unused)))
  80 {
  81         int             c;
  82         int             retval;
  83         char            *out_fn;
  84         FILE            *out_file;
  85
  86         char            *inode_spec = NULL;
  87         char            *journal_fn = NULL;
  88         int             journal_fd = 0;
  89         int             use_sb = 0;
  90         ext2_ino_t      journal_inum;
  91         struct ext2_inode journal_inode;
  92         ext2_file_t     journal_file;
  93         char            *tmp;
  94         struct journal_source journal_source;
  95         struct ext2_super_block *es = NULL;
  96
  97         journal_source.where = JOURNAL_IS_INTERNAL;
  98         journal_source.fd = 0;
  99         journal_source.file = 0;
 100         dump_all = 0;
 101         dump_old = 0;
 102         dump_contents = 0;
 103         dump_super = 0;
 104         dump_descriptors = 1;
 105         block_to_dump = ANY_BLOCK;
 106         bitmap_to_dump = -1;
 107         inode_block_to_dump = ANY_BLOCK;
 108         inode_to_dump = -1;
 109
 110         reset_getopt();
 111         while ((c = getopt (argc, argv, "ab:ci:f:OsS")) != EOF) {
 112                 switch (c) {
 113                 case 'a':
 114                         dump_all++;
 115                         break;
 116                 case 'b':
 117                         block_to_dump = strtoul(optarg, &tmp, 0);
 118                         if (*tmp) {
 119                                 com_err(argv[0], 0,
 120                                         "Bad block number - %s", optarg);
 121                                 return;
 122                         }
 123                         dump_descriptors = 0;
 124                         break;
 125                 case 'c':
 126                         dump_contents++;
 127                         break;
 128                 case 'f':
 129                         journal_fn = optarg;
 130                         break;
 131                 case 'i':
 132                         inode_spec = optarg;
 133                         dump_descriptors = 0;
 134                         break;
 135                 case 'O':
 136                         dump_old++;
 137                         break;
 138                 case 's':
 139                         use_sb++;
 140                         break;
 141                 case 'S':
 142                         dump_super++;
 143                         break;
 144                 default:
 145                         goto print_usage;
 146                 }
 147         }
 148         if (optind != argc && optind != argc-1) {
 149                 goto print_usage;
 150         }
 151
 152         if (current_fs)
 153                 es = current_fs->super;
 154
 155         if (inode_spec) {
 156                 int inode_group, group_offset, inodes_per_block;
 157
 158                 if (check_fs_open(argv[0]))
 159                         return;
 160
 161                 inode_to_dump = string_to_inode(inode_spec);
 162                 if (!inode_to_dump)
 163                         return;
 164
 165                 inode_group = ((inode_to_dump - 1)
 166                                / es->s_inodes_per_group);
 167                 group_offset = ((inode_to_dump - 1)
 168                                 % es->s_inodes_per_group);
 169                 inodes_per_block = (current_fs->blocksize
 170                                     / sizeof(struct ext2_inode));
 171
 172                 inode_block_to_dump =
 173                         ext2fs_inode_table_loc(current_fs, inode_group) +
 174                         (group_offset / inodes_per_block);
 175                 inode_offset_to_dump = ((group_offset % inodes_per_block)
 176                                         * sizeof(struct ext2_inode));
 177                 printf("Inode %u is at group %u, block %llu, offset %u\n",
 178                        inode_to_dump, inode_group,
 179                        (unsigned long long) inode_block_to_dump,
 180                        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[EXT2_MAX_BLOCK_SIZE];
 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         __u64                   total_len;
 362         __u32                   maxlen;
 363
 364         /* First, check to see if there's an ext2 superblock header */
 365         retval = read_journal_block(cmdname, source, 0, buf, 2048);
 366         if (retval)
 367                 return;
 368
 369         jsb = (journal_superblock_t *) buf;
 370         sb = (struct ext2_super_block *) (buf+1024);
 371 #ifdef WORDS_BIGENDIAN
 372         if (sb->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
 373                 ext2fs_swap_super(sb);
 374 #endif
 375
 376         if ((be32_to_cpu(jsb->s_header.h_magic) != JBD2_MAGIC_NUMBER) &&
 377             (sb->s_magic == EXT2_SUPER_MAGIC) &&
 378             ext2fs_has_feature_journal_dev(sb)) {
 379                 blocksize = EXT2_BLOCK_SIZE(sb);
 380                 blocknr = (blocksize == 1024) ? 2 : 1;
 381                 uuid_unparse(sb->s_uuid, jsb_buffer);
 382                 fprintf(out_file, "Ext2 superblock header found.\n");
 383                 if (dump_all) {
 384                         fprintf(out_file, "\tuuid=%s\n", jsb_buffer);
 385                         fprintf(out_file, "\tblocksize=%d\n", blocksize);
 386                         fprintf(out_file, "\tjournal data size %lu\n",
 387                                 (unsigned long) ext2fs_blocks_count(sb));
 388                 }
 389         }
 390
 391         /* Next, read the journal superblock */
 392         retval = read_journal_block(cmdname, source,
 393                                     ((ext2_loff_t) blocknr) * blocksize,
 394                                     jsb_buffer, 1024);
 395         if (retval)
 396                 return;
 397
 398         if (dump_super) {
 399                 e2p_list_journal_super(out_file, jsb_buffer,
 400                                        current_fs->blocksize, 0);
 401                 fputc('\n', out_file);
 402         }
 403
 404         jsb = (journal_superblock_t *) jsb_buffer;
 405         if (be32_to_cpu(jsb->s_header.h_magic) != JBD2_MAGIC_NUMBER) {
 406                 fprintf(out_file,
 407                         "Journal superblock magic number invalid!\n");
 408                 return;
 409         }
 410         blocksize = be32_to_cpu(jsb->s_blocksize);
 411         if ((current_fs && (blocksize != current_fs->blocksize)) ||
 412             (!current_fs && (!blocksize || (blocksize & (blocksize - 1)) ||
 413                              (blocksize > EXT2_MAX_BLOCK_SIZE)))) {
 414                 fprintf(out_file,
 415                         "Journal block size invalid: %u (%u)\n",
 416                         be32_to_cpu(jsb->s_blocksize), blocksize);
 417                 return;
 418         }
 419         transaction = be32_to_cpu(jsb->s_sequence);
 420         blocknr = be32_to_cpu(jsb->s_start);
 421         if (source->where == JOURNAL_IS_INTERNAL) {
 422                 retval = ext2fs_file_get_lsize(source->file, &total_len);
 423                 if (retval) {
 424                 stat_err:
 425                         com_err("dump_journal", retval,
 426                                 "while getting journal inode size");
 427                         return;
 428                 }
 429                 total_len /= blocksize;
 430         } else {
 431                         struct stat st;
 432
 433                         if (fstat(source->fd, &st) < 0)
 434                                 goto stat_err;
 435                         total_len = st.st_size / blocksize;
 436         }
 437         maxlen = be32_to_cpu(jsb->s_maxlen);
 438         if (maxlen > total_len)
 439                 maxlen = total_len;
 440
 441         fprintf(out_file, "Journal starts at block %u, transaction %u\n",
 442                 blocknr, transaction);
 443
 444         if (!blocknr) {
 445                 /* Empty journal, nothing to do. */
 446                 if (!dump_old)
 447                         goto fc;
 448                 else
 449                         blocknr = 1;
 450         }
 451
 452         while (1) {
 453                 retval = read_journal_block(cmdname, source,
 454                                 ((ext2_loff_t) blocknr) * blocksize,
 455                                 buf, blocksize);
 456                 if (retval)
 457                         break;
 458
 459                 header = (journal_header_t *) buf;
 460
 461                 magic = be32_to_cpu(header->h_magic);
 462                 sequence = be32_to_cpu(header->h_sequence);
 463                 blocktype = be32_to_cpu(header->h_blocktype);
 464
 465                 if (magic != JBD2_MAGIC_NUMBER) {
 466                         fprintf (out_file, "No magic number at block %u: "
 467                                  "end of journal.\n", blocknr);
 468                         break;
 469                 }
 470
 471                 if (sequence != transaction) {
 472                         fprintf (out_file, "Found sequence %u (not %u) at "
 473                                  "block %u: end of journal.\n",
 474                                  sequence, transaction, blocknr);
 475                         if (!dump_old)
 476                                 break;
 477                 }
 478
 479                 if (dump_descriptors) {
 480                         fprintf (out_file, "Found expected sequence %u, "
 481                                  "type %u (%s) at block %u\n",
 482                                  sequence, blocktype,
 483                                  type_to_name(blocktype), blocknr);
 484                 }
 485
 486                 switch (blocktype) {
 487                 case JBD2_DESCRIPTOR_BLOCK:
 488                         dump_descriptor_block(out_file, source, buf, jsb,
 489                                               &blocknr, blocksize, maxlen,
 490                                               transaction);
 491                         continue;
 492
 493                 case JBD2_COMMIT_BLOCK:
 494                         transaction++;
 495                         blocknr++;
 496                         WRAP(jsb, blocknr, maxlen);
 497                         continue;
 498
 499                 case JBD2_REVOKE_BLOCK:
 500                         dump_revoke_block(out_file, buf, jsb,
 501                                           blocknr, blocksize,
 502                                           transaction);
 503                         blocknr++;
 504                         WRAP(jsb, blocknr, maxlen);
 505                         continue;
 506
 507                 default:
 508                         fprintf (out_file, "Unexpected block type %u at "
 509                                  "block %u.\n", blocktype, blocknr);
 510                         break;
 511                 }
 512         }
 513
 514 fc:
 515         blocknr = maxlen - jbd2_journal_get_num_fc_blks(jsb) + 1;
 516         while (blocknr <= maxlen) {
 517                 retval = read_journal_block(cmdname, source,
 518                                 ((ext2_loff_t) blocknr) * blocksize,
 519                                 buf, blocksize);
 520                 if (retval)
 521                         return;
 522
 523                 dump_fc_block(out_file, buf, blocksize, transaction, &fc_done,
 524                         dump_old);
 525                 if (!dump_old && fc_done)
 526                         break;
 527                 blocknr++;
 528         }
 529 }
 530
 531 static inline size_t journal_super_tag_bytes(journal_superblock_t *jsb)
 532 {
 533         size_t sz;
 534
 535         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JBD2_FEATURE_INCOMPAT_CSUM_V3))
 536                 return sizeof(journal_block_tag3_t);
 537
 538         sz = sizeof(journal_block_tag_t);
 539
 540         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JBD2_FEATURE_INCOMPAT_CSUM_V2))
 541                 sz += sizeof(__u16);
 542
 543         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JBD2_FEATURE_INCOMPAT_64BIT))
 544                 return sz;
 545
 546         return sz - sizeof(__u32);
 547 }
 548
 549 static void dump_fc_block(FILE *out_file, char *buf, int blocksize,
 550         int transaction, int *fc_done, int dump_old)
 551 {
 552         struct ext4_fc_tl       *tl;
 553         struct ext4_fc_head     *head;
 554         struct ext4_fc_add_range        *add_range;
 555         struct ext4_fc_del_range        *del_range;
 556         struct ext4_fc_dentry_info      *dentry_info;
 557         struct ext4_fc_tail             *tail;
 558         struct ext3_extent      *ex;
 559
 560         *fc_done = 0;
 561         fc_for_each_tl(buf, buf + blocksize, tl) {
 562                 switch (le16_to_cpu(tl->fc_tag)) {
 563                 case EXT4_FC_TAG_ADD_RANGE:
 564                         add_range =
 565                                 (struct ext4_fc_add_range *)ext4_fc_tag_val(tl);
 566                         ex = (struct ext3_extent *)add_range->fc_ex;
 567                         fprintf(out_file,
 568                                 "tag %s, inode %d, lblk %u, pblk %llu, len %lu\n",
 569                                 tag2str(tl->fc_tag),
 570                                 le32_to_cpu(add_range->fc_ino),
 571                                 le32_to_cpu(ex->ee_block),
 572                                 le32_to_cpu(ex->ee_start) +
 573                                 (((unsigned long long) le16_to_cpu(ex->ee_start_hi)) << 32),
 574                                 le16_to_cpu(ex->ee_len) > EXT_INIT_MAX_LEN ?
 575                                 le16_to_cpu(ex->ee_len) - EXT_INIT_MAX_LEN :
 576                                 le16_to_cpu(ex->ee_len));
 577                         break;
 578                 case EXT4_FC_TAG_DEL_RANGE:
 579                         del_range =
 580                                 (struct ext4_fc_del_range *)ext4_fc_tag_val(tl);
 581                         fprintf(out_file, "tag %s, inode %d, lblk %d, len %d\n",
 582                                 tag2str(tl->fc_tag),
 583                                 le32_to_cpu(del_range->fc_ino),
 584                                 le32_to_cpu(del_range->fc_lblk),
 585                                 le32_to_cpu(del_range->fc_len));
 586                         break;
 587                 case EXT4_FC_TAG_LINK:
 588                 case EXT4_FC_TAG_UNLINK:
 589                 case EXT4_FC_TAG_CREAT:
 590                         dentry_info =
 591                                 (struct ext4_fc_dentry_info *)
 592                                         ext4_fc_tag_val(tl);
 593                         fprintf(out_file,
 594                                 "tag %s, parent %d, ino %d, name \"%s\"\n",
 595                                 tag2str(tl->fc_tag),
 596                                 le32_to_cpu(dentry_info->fc_parent_ino),
 597                                 le32_to_cpu(dentry_info->fc_ino),
 598                                 dentry_info->fc_dname);
 599                         break;
 600                 case EXT4_FC_TAG_INODE:
 601                         fprintf(out_file, "tag %s, inode %d\n",
 602                                 tag2str(tl->fc_tag),
 603                                 le32_to_cpu(((struct ext4_fc_inode *)
 604                                         ext4_fc_tag_val(tl))->fc_ino));
 605                         break;
 606                 case EXT4_FC_TAG_PAD:
 607                         fprintf(out_file, "tag %s\n", tag2str(tl->fc_tag));
 608                         break;
 609                 case EXT4_FC_TAG_TAIL:
 610                         tail = (struct ext4_fc_tail *)ext4_fc_tag_val(tl);
 611                         fprintf(out_file, "tag %s, tid %d\n",
 612                                 tag2str(tl->fc_tag),
 613                                 le32_to_cpu(tail->fc_tid));
 614                         if (!dump_old &&
 615                                 le32_to_cpu(tail->fc_tid) < transaction) {
 616                                 *fc_done = 1;
 617                                 return;
 618                         }
 619                         break;
 620                 case EXT4_FC_TAG_HEAD:
 621                         fprintf(out_file, "\n*** Fast Commit Area ***\n");
 622                         head = (struct ext4_fc_head *)ext4_fc_tag_val(tl);
 623                         fprintf(out_file, "tag %s, features 0x%x, tid %d\n",
 624                                 tag2str(tl->fc_tag),
 625                                 le32_to_cpu(head->fc_features),
 626                                 le32_to_cpu(head->fc_tid));
 627                         if (!dump_old &&
 628                                 le32_to_cpu(head->fc_tid) < transaction) {
 629                                 *fc_done = 1;
 630                                 return;
 631                         }
 632                         break;
 633                 default:
 634                         *fc_done = 1;
 635                         break;
 636                 }
 637         }
 638 }
 639
 640 static void dump_descriptor_block(FILE *out_file,
 641                                   struct journal_source *source,
 642                                   char *buf,
 643                                   journal_superblock_t *jsb,
 644                                   unsigned int *blockp, int blocksize,
 645                                   __u32 maxlen,
 646                                   tid_t transaction)
 647 {
 648         int                     offset, tag_size, csum_size = 0;
 649         char                    *tagp;
 650         journal_block_tag_t     *tag;
 651         unsigned int            blocknr;
 652         __u32                   tag_block;
 653         __u32                   tag_flags;
 654
 655         tag_size = journal_super_tag_bytes(jsb);
 656         offset = sizeof(journal_header_t);
 657         blocknr = *blockp;
 658
 659         if (JSB_HAS_INCOMPAT_FEATURE(jsb, JBD2_FEATURE_INCOMPAT_CSUM_V3) ||
 660             JSB_HAS_INCOMPAT_FEATURE(jsb, JBD2_FEATURE_INCOMPAT_CSUM_V2))
 661                 csum_size = sizeof(struct jbd2_journal_block_tail);
 662
 663         if (dump_all)
 664                 fprintf(out_file, "Dumping descriptor block, sequence %u, at "
 665                         "block %u:\n", transaction, blocknr);
 666
 667         ++blocknr;
 668         WRAP(jsb, blocknr, maxlen);
 669
 670         do {
 671                 /* Work out the location of the current tag, and skip to
 672                  * the next one... */
 673                 tagp = &buf[offset];
 674                 tag = (journal_block_tag_t *) tagp;
 675                 offset += tag_size;
 676
 677                 /* ... and if we have gone too far, then we've reached the
 678                    end of this block. */
 679                 if (offset > blocksize - csum_size)
 680                         break;
 681
 682                 tag_block = be32_to_cpu(tag->t_blocknr);
 683                 tag_flags = be16_to_cpu(tag->t_flags);
 684
 685                 if (!(tag_flags & JBD2_FLAG_SAME_UUID))
 686                         offset += 16;
 687
 688                 dump_metadata_block(out_file, source, jsb,
 689                                     blocknr, tag_block, tag_flags, blocksize,
 690                                     transaction);
 691
 692                 ++blocknr;
 693                 WRAP(jsb, blocknr, maxlen);
 694
 695         } while (!(tag_flags & JBD2_FLAG_LAST_TAG));
 696
 697         *blockp = blocknr;
 698 }
 699
 700
 701 static void dump_revoke_block(FILE *out_file, char *buf,
 702                               journal_superblock_t *jsb EXT2FS_ATTR((unused)),
 703                               unsigned int blocknr,
 704                               int blocksize EXT2FS_ATTR((unused)),
 705                               tid_t transaction)
 706 {
 707         int                     offset, max;
 708         jbd2_journal_revoke_header_t *header;
 709         unsigned long long      rblock;
 710         int                     tag_size = sizeof(__u32);
 711
 712         if (dump_all)
 713                 fprintf(out_file, "Dumping revoke block, sequence %u, at "
 714                         "block %u:\n", transaction, blocknr);
 715
 716         if (be32_to_cpu(jsb->s_feature_incompat) & JBD2_FEATURE_INCOMPAT_64BIT)
 717                 tag_size = sizeof(__u64);
 718
 719         header = (jbd2_journal_revoke_header_t *) buf;
 720         offset = sizeof(jbd2_journal_revoke_header_t);
 721         max = be32_to_cpu(header->r_count);
 722         if (max > jsb->s_blocksize) {
 723                 fprintf(out_file, "Revoke block's r_count invalid: %u\b",
 724                         max);
 725                 max = jsb->s_blocksize;
 726         }
 727
 728         while (offset < max) {
 729                 if (tag_size == sizeof(__u32)) {
 730                         __u32 *entry = (__u32 *) (buf + offset);
 731                         rblock = be32_to_cpu(*entry);
 732                 } else {
 733                         __u64 *entry = (__u64 *) (buf + offset);
 734                         rblock = ext2fs_be64_to_cpu(*entry);
 735                 }
 736                 if (dump_all || rblock == block_to_dump) {
 737                         fprintf(out_file, "  Revoke FS block %llu",
 738                                 (unsigned long long) rblock);
 739                         if (dump_all)
 740                                 fprintf(out_file, "\n");
 741                         else
 742                                 fprintf(out_file," at block %u, sequence %u\n",
 743                                         blocknr, transaction);
 744                 }
 745                 offset += tag_size;
 746         }
 747 }
 748
 749
 750 static void show_extent(FILE *out_file, int start_extent, int end_extent,
 751                         __u32 first_block)
 752 {
 753         if (start_extent >= 0 && first_block != 0)
 754                 fprintf(out_file, "(%d+%u): %u ",
 755                         start_extent, end_extent-start_extent, first_block);
 756 }
 757
 758 static void show_indirect(FILE *out_file, const char *name, __u32 where)
 759 {
 760         if (where)
 761                 fprintf(out_file, "(%s): %u ", name, where);
 762 }
 763
 764
 765 static void dump_metadata_block(FILE *out_file, struct journal_source *source,
 766                                 journal_superblock_t *jsb EXT2FS_ATTR((unused)),
 767                                 unsigned int log_blocknr,
 768                                 unsigned int fs_blocknr,
 769                                 unsigned int log_tag_flags,
 770                                 int blocksize,
 771                                 tid_t transaction)
 772 {
 773         int             retval;
 774         char            buf[8192];
 775
 776         if (!(dump_all
 777               || (fs_blocknr == block_to_dump)
 778               || (fs_blocknr == inode_block_to_dump)
 779               || (fs_blocknr == bitmap_to_dump)))
 780                 return;
 781
 782         fprintf(out_file, "  FS block %u logged at ", fs_blocknr);
 783         if (!dump_all)
 784                 fprintf(out_file, "sequence %u, ", transaction);
 785         fprintf(out_file, "journal block %u (flags 0x%x)\n", log_blocknr,
 786                 log_tag_flags);
 787
 788         /* There are two major special cases to parse:
 789          *
 790          * If this block is a block
 791          * bitmap block, we need to give it special treatment so that we
 792          * can log any allocates and deallocates which affect the
 793          * block_to_dump query block.
 794          *
 795          * If the block is an inode block for the inode being searched
 796          * for, then we need to dump the contents of that inode
 797          * structure symbolically.
 798          */
 799
 800         if (!(dump_contents && dump_all)
 801             && fs_blocknr != block_to_dump
 802             && fs_blocknr != bitmap_to_dump
 803             && fs_blocknr != inode_block_to_dump)
 804                 return;
 805
 806         retval = read_journal_block("logdump", source,
 807                                     ((ext2_loff_t) log_blocknr) * blocksize,
 808                                     buf, blocksize);
 809         if (retval)
 810                 return;
 811
 812         if (fs_blocknr == bitmap_to_dump) {
 813                 struct ext2_super_block *super;
 814                 int offset;
 815
 816                 super = current_fs->super;
 817                 offset = ((block_to_dump - super->s_first_data_block) %
 818                           super->s_blocks_per_group);
 819
 820                 fprintf(out_file, "    (block bitmap for block %llu: "
 821                         "block is %s)\n",
 822                         (unsigned long long) block_to_dump,
 823                         ext2fs_test_bit(offset, buf) ? "SET" : "CLEAR");
 824         }
 825
 826         if (fs_blocknr == inode_block_to_dump) {
 827                 struct ext2_inode *inode;
 828                 int first, prev, this, start_extent, i;
 829
 830                 fprintf(out_file, "    (inode block for inode %u):\n",
 831                         inode_to_dump);
 832
 833                 inode = (struct ext2_inode *) (buf + inode_offset_to_dump);
 834                 internal_dump_inode(out_file, "    ", inode_to_dump, inode, 0);
 835
 836                 /* Dump out the direct/indirect blocks here:
 837                  * internal_dump_inode can only dump them from the main
 838                  * on-disk inode, not from the journaled copy of the
 839                  * inode. */
 840
 841                 fprintf (out_file, "    Blocks:  ");
 842                 first = prev = start_extent = -1;
 843
 844                 for (i=0; i<EXT2_NDIR_BLOCKS; i++) {
 845                         this = inode->i_block[i];
 846                         if (start_extent >= 0  && this == prev+1) {
 847                                 prev = this;
 848                                 continue;
 849                         } else {
 850                                 show_extent(out_file, start_extent, i, first);
 851                                 start_extent = i;
 852                                 first = prev = this;
 853                         }
 854                 }
 855                 show_extent(out_file, start_extent, i, first);
 856                 show_indirect(out_file, "IND", inode->i_block[i++]);
 857                 show_indirect(out_file, "DIND", inode->i_block[i++]);
 858                 show_indirect(out_file, "TIND", inode->i_block[i++]);
 859
 860                 fprintf(out_file, "\n");
 861         }
 862
 863         if (dump_contents)
 864                 do_hexdump(out_file, buf, blocksize);
 865
 866 }
 867
 868 static void do_hexdump (FILE *out_file, char *buf, int blocksize)
 869 {
 870         int i,j;
 871         int *intp;
 872         char *charp;
 873         unsigned char c;
 874
 875         intp = (int *) buf;
 876         charp = (char *) buf;
 877
 878         for (i=0; i<blocksize; i+=16) {
 879                 fprintf(out_file, "    %04x:  ", i);
 880                 for (j=0; j<16; j+=4)
 881                         fprintf(out_file, "%08x ", *intp++);
 882                 for (j=0; j<16; j++) {
 883                         c = *charp++;
 884                         if (c < ' ' || c >= 127)
 885                                 c = '.';
 886                         fprintf(out_file, "%c", c);
 887                 }
 888                 fprintf(out_file, "\n");
 889         }
 890 }
 891