debugfs/logdump.c

   1 /*
   2  * logdump.c --- dump the contents of the journal out to a file
   3  *
   4  * Authro: 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 <stdio.h>
  13 #include <unistd.h>
  14 #include <stdlib.h>
  15 #include <ctype.h>
  16 #include <string.h>
  17 #include <time.h>
  18 #ifdef HAVE_ERRNO_H
  19 #include <errno.h>
  20 #endif
  21 #include <sys/types.h>
  22 #include <sys/stat.h>
  23 #include <fcntl.h>
  24 #include <utime.h>
  25 #ifdef HAVE_GETOPT_H
  26 #include <getopt.h>
  27 #else
  28 extern int optind;
  29 extern char *optarg;
  30 #endif
  31 #ifdef HAVE_OPTRESET
  32 extern int optreset;            /* defined by BSD, but not others */
  33 #endif
  34
  35 #include "debugfs.h"
  36 #include "jfs_user.h"
  37 #include <uuid/uuid.h>
  38
  39 enum journal_location {JOURNAL_IS_INTERNAL, JOURNAL_IS_EXTERNAL};
  40
  41 int             dump_all, dump_contents, dump_descriptors;
  42 unsigned int    block_to_dump, group_to_dump, bitmap_to_dump;
  43 unsigned int    inode_block_to_dump, inode_offset_to_dump, bitmap_to_dump;
  44 ext2_ino_t      inode_to_dump;
  45
  46 struct journal_source
  47 {
  48         enum journal_location where;
  49         int fd;
  50         ext2_file_t file;
  51 };
  52
  53 static void dump_journal(char *, FILE *, struct journal_source *);
  54
  55 static void dump_descriptor_block(FILE *, struct journal_source *,
  56                                   char *, journal_superblock_t *,
  57                                   unsigned int *, int, tid_t);
  58
  59 static void dump_revoke_block(FILE *, char *, journal_superblock_t *,
  60                                   unsigned int, int, tid_t);
  61
  62 static void dump_metadata_block(FILE *, struct journal_source *,
  63                                 journal_superblock_t*,
  64                                 unsigned int, unsigned int, int, tid_t);
  65
  66 static void do_hexdump (FILE *, char *, int);
  67
  68 #define WRAP(jsb, blocknr)                                      \
  69         if (blocknr >= be32_to_cpu((jsb)->s_maxlen))            \
  70                 blocknr -= (be32_to_cpu((jsb)->s_maxlen) -      \
  71                             be32_to_cpu((jsb)->s_first));
  72
  73
  74 void do_logdump(int argc, char **argv)
  75 {
  76         int             c;
  77         int             retval;
  78         char            *out_fn;
  79         FILE            *out_file;
  80
  81         char            *inode_spec = NULL;
  82         char            *journal_fn = NULL;
  83         int             journal_fd = 0;
  84         ext2_ino_t      journal_inum;
  85         struct ext2_inode journal_inode;
  86         ext2_file_t     journal_file;
  87
  88         char            *tmp;
  89
  90         const char      *logdump_usage = ("Usage: logdump "
  91                                           "[-ac] [-b<block>] [-i<inode>] "
  92                                           "[-f<journal_file>] [output_file]");
  93
  94         struct journal_source journal_source;
  95
  96         optind = 0;
  97 #ifdef HAVE_OPTRESET
  98         optreset = 1;           /* Makes BSD getopt happy */
  99 #endif
 100         journal_source.where = 0;
 101         journal_source.fd = 0;
 102         journal_source.file = 0;
 103         dump_all = 0;
 104         dump_contents = 0;
 105         dump_descriptors = 1;
 106         block_to_dump = -1;
 107         bitmap_to_dump = -1;
 108         inode_block_to_dump = -1;
 109         inode_to_dump = -1;
 110
 111         while ((c = getopt (argc, argv, "ab:ci:f:")) != 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                 default:
 136                         com_err(argv[0], 0, logdump_usage);
 137                         return;
 138                 }
 139         }
 140         if (optind != argc && optind != argc-1) {
 141                 com_err(argv[0], 0, logdump_usage);
 142                 return;
 143         }
 144
 145         if (inode_spec) {
 146                 int inode_group, group_offset, inodes_per_block;
 147
 148                 if (check_fs_open(argv[0]))
 149                         return;
 150
 151                 inode_to_dump = string_to_inode(inode_spec);
 152                 if (!inode_to_dump)
 153                         return;
 154
 155                 inode_group = ((inode_to_dump - 1)
 156                                / current_fs->super->s_inodes_per_group);
 157                 group_offset = ((inode_to_dump - 1)
 158                                 % current_fs->super->s_inodes_per_group);
 159                 inodes_per_block = (current_fs->blocksize
 160                                     / sizeof(struct ext2_inode));
 161
 162                 inode_block_to_dump =
 163                         current_fs->group_desc[inode_group].bg_inode_table +
 164                         (group_offset / inodes_per_block);
 165                 inode_offset_to_dump = ((group_offset % inodes_per_block)
 166                                         * sizeof(struct ext2_inode));
 167                 printf("Inode %u is at group %u, block %u, offset %u\n",
 168                        inode_to_dump, inode_group,
 169                        inode_block_to_dump, inode_offset_to_dump);
 170         }
 171
 172         if (optind == argc) {
 173                 out_file = stdout;
 174         } else {
 175                 out_fn = argv[optind];
 176                 out_file = fopen(out_fn, "w");
 177                 if (!out_file < 0) {
 178                         com_err(argv[0], errno, "while opening %s for logdump",
 179                                 out_fn);
 180                         return;
 181                 }
 182         }
 183
 184         if (block_to_dump != -1 && current_fs != NULL) {
 185                 group_to_dump = ((block_to_dump -
 186                                   current_fs->super->s_first_data_block)
 187                                  / current_fs->super->s_blocks_per_group);
 188                 bitmap_to_dump = current_fs->group_desc[group_to_dump].bg_block_bitmap;
 189         }
 190
 191         if (!journal_fn && check_fs_open(argv[0]))
 192                 return;
 193
 194         if (journal_fn) {
 195                 /* Set up to read journal from a regular file somewhere */
 196                 journal_fd = open(journal_fn, O_RDONLY, 0);
 197                 if (journal_fd < 0) {
 198                         com_err(argv[0], errno, "while opening %s for logdump",
 199                                 journal_fn);
 200                         return;
 201                 }
 202
 203                 journal_source.where = JOURNAL_IS_EXTERNAL;
 204                 journal_source.fd = journal_fd;
 205         } else if ((journal_inum = current_fs->super->s_journal_inum)) {
 206                 retval = ext2fs_read_inode(current_fs, journal_inum,
 207                                            &journal_inode);
 208                 if (retval) {
 209                         com_err(argv[0], retval,
 210                                 "while reading inode %u", journal_inum);
 211                         return;
 212                 }
 213
 214                 retval = ext2fs_file_open(current_fs, journal_inum,
 215                                           0, &journal_file);
 216                 if (retval) {
 217                         com_err(argv[0], retval, "while opening ext2 file");
 218                         return;
 219                 }
 220                 journal_source.where = JOURNAL_IS_INTERNAL;
 221                 journal_source.file = journal_file;
 222         } else if ((journal_fn =
 223             ext2fs_find_block_device(current_fs->super->s_journal_dev))) {
 224                 journal_fd = open(journal_fn, O_RDONLY, 0);
 225                 if (journal_fd < 0) {
 226                         com_err(argv[0], errno, "while opening %s for logdump",
 227                                 journal_fn);
 228                         free(journal_fn);
 229                         return;
 230                 }
 231                 fprintf(out_file, "Using external journal found at %s\n",
 232                         journal_fn);
 233                 free(journal_fn);
 234                 journal_source.where = JOURNAL_IS_EXTERNAL;
 235                 journal_source.fd = journal_fd;
 236         } else {
 237                 com_err(argv[0], 0, "filesystem has no journal");
 238                 return;
 239         }
 240
 241         dump_journal(argv[0], out_file, &journal_source);
 242
 243         if (journal_source.where == JOURNAL_IS_INTERNAL)
 244                 ext2fs_file_close(journal_file);
 245         else
 246                 close(journal_fd);
 247
 248         if (out_file != stdout)
 249                 fclose(out_file);
 250
 251         return;
 252 }
 253
 254
 255 static int read_journal_block(const char *cmd, struct journal_source *source,
 256                               off_t offset, char *buf, int size,
 257                               unsigned int *got)
 258 {
 259         int retval;
 260
 261         if (source->where == JOURNAL_IS_EXTERNAL) {
 262                 if (lseek(source->fd, offset, SEEK_SET) < 0) {
 263                         retval = errno;
 264                         com_err(cmd, retval, "while seeking in reading journal");
 265                         return retval;
 266                 }
 267                 retval = read(source->fd, buf, size);
 268                 if (retval >= 0) {
 269                         *got = retval;
 270                         retval = 0;
 271                 } else
 272                         retval = errno;
 273         } else {
 274                 retval = ext2fs_file_lseek(source->file, offset,
 275                                            EXT2_SEEK_SET, NULL);
 276                 if (retval) {
 277                         com_err(cmd, retval, "while seeking in reading journal");
 278                         return retval;
 279                 }
 280
 281                 retval = ext2fs_file_read(source->file, buf, size, got);
 282         }
 283
 284         if (retval)
 285                 com_err(cmd, retval, "while while reading journal");
 286         else if (*got != size) {
 287                 com_err(cmd, 0, "short read (read %d, expected %d) while while reading journal", *got, size);
 288                 retval = -1;
 289         }
 290
 291         return retval;
 292 }
 293
 294 static const char *type_to_name(int btype)
 295 {
 296         switch (btype) {
 297         case JFS_DESCRIPTOR_BLOCK:
 298                 return "descriptor block";
 299         case JFS_COMMIT_BLOCK:
 300                 return "commit block";
 301         case JFS_SUPERBLOCK_V1:
 302                 return "V1 superblock";
 303         case JFS_SUPERBLOCK_V2:
 304                 return "V2 superblock";
 305         case JFS_REVOKE_BLOCK:
 306                 return "revoke table";
 307         }
 308         return "unrecognised type";
 309 }
 310
 311
 312 static void dump_journal(char *cmdname, FILE *out_file,
 313                          struct journal_source *source)
 314 {
 315         struct ext2_super_block *sb;
 316         char                    jsb_buffer[1024];
 317         char                    buf[8192];
 318         journal_superblock_t    *jsb;
 319         int                     blocksize = 1024;
 320         unsigned int            got;
 321         int                     retval;
 322         __u32                   magic, sequence, blocktype;
 323         journal_header_t        *header;
 324
 325         tid_t                   transaction;
 326         unsigned int            blocknr = 0;
 327
 328         /* First, check to see if there's an ext2 superblock header */
 329         retval = read_journal_block(cmdname, source, 0,
 330                                     buf, 2048, &got);
 331         if (retval)
 332                 return;
 333
 334         jsb = (journal_superblock_t *) buf;
 335         sb = (struct ext2_super_block *) (buf+1024);
 336 #ifdef ENABLE_SWAPFS
 337         if (sb->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
 338                 ext2fs_swap_super(sb);
 339 #endif
 340
 341         if ((be32_to_cpu(jsb->s_header.h_magic) != JFS_MAGIC_NUMBER) &&
 342             (sb->s_magic == EXT2_SUPER_MAGIC) &&
 343             (sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
 344                 blocksize = EXT2_BLOCK_SIZE(sb);
 345                 blocknr = (blocksize == 1024) ? 2 : 1;
 346                 uuid_unparse(sb->s_uuid, jsb_buffer);
 347                 fprintf(out_file, "Ext2 superblock header found.\n");
 348                 if (dump_all) {
 349                         fprintf(out_file, "\tuuid=%s\n", jsb_buffer);
 350                         fprintf(out_file, "\tblocksize=%d\n", blocksize);
 351                         fprintf(out_file, "\tjournal data size %ld\n",
 352                                 (long) sb->s_blocks_count);
 353                 }
 354         }
 355
 356         /* Next, read the journal superblock */
 357
 358         retval = read_journal_block(cmdname, source, blocknr*blocksize,
 359                                     jsb_buffer, 1024, &got);
 360         if (retval)
 361                 return;
 362
 363         jsb = (journal_superblock_t *) jsb_buffer;
 364         if (be32_to_cpu(jsb->s_header.h_magic) != JFS_MAGIC_NUMBER) {
 365                 fprintf(out_file,
 366                         "Journal superblock magic number invalid!\n");
 367                 return;
 368         }
 369         blocksize = be32_to_cpu(jsb->s_blocksize);
 370         transaction = be32_to_cpu(jsb->s_sequence);
 371         blocknr = be32_to_cpu(jsb->s_start);
 372
 373         fprintf(out_file, "Journal starts at block %u, transaction %u\n",
 374                 blocknr, transaction);
 375
 376         if (!blocknr)
 377                 /* Empty journal, nothing to do. */
 378                 return;
 379
 380         while (1) {
 381                 retval = read_journal_block(cmdname, source,
 382                                             blocknr*blocksize, buf,
 383                                             blocksize, &got);
 384                 if (retval || got != blocksize)
 385                         return;
 386
 387                 header = (journal_header_t *) buf;
 388
 389                 magic = be32_to_cpu(header->h_magic);
 390                 sequence = be32_to_cpu(header->h_sequence);
 391                 blocktype = be32_to_cpu(header->h_blocktype);
 392
 393                 if (magic != JFS_MAGIC_NUMBER) {
 394                         fprintf (out_file, "No magic number at block %u: "
 395                                  "end of journal.\n", blocknr);
 396                         return;
 397                 }
 398
 399                 if (sequence != transaction) {
 400                         fprintf (out_file, "Found sequence %u (not %u) at "
 401                                  "block %u: end of journal.\n",
 402                                  sequence, transaction, blocknr);
 403                         return;
 404                 }
 405
 406                 if (dump_descriptors) {
 407                         fprintf (out_file, "Found expected sequence %u, "
 408                                  "type %u (%s) at block %u\n",
 409                                  sequence, blocktype,
 410                                  type_to_name(blocktype), blocknr);
 411                 }
 412
 413                 switch (blocktype) {
 414                 case JFS_DESCRIPTOR_BLOCK:
 415                         dump_descriptor_block(out_file, source, buf, jsb,
 416                                               &blocknr, blocksize,
 417                                               transaction);
 418                         continue;
 419
 420                 case JFS_COMMIT_BLOCK:
 421                         transaction++;
 422                         blocknr++;
 423                         WRAP(jsb, blocknr);
 424                         continue;
 425
 426                 case JFS_REVOKE_BLOCK:
 427                         dump_revoke_block(out_file, buf, jsb,
 428                                           blocknr, blocksize,
 429                                           transaction);
 430                         blocknr++;
 431                         WRAP(jsb, blocknr);
 432                         continue;
 433
 434                 default:
 435                         fprintf (out_file, "Unexpected block type %u at "
 436                                  "block %u.\n", blocktype, blocknr);
 437                         return;
 438                 }
 439         }
 440 }
 441
 442
 443 static void dump_descriptor_block(FILE *out_file,
 444                                   struct journal_source *source,
 445                                   char *buf,
 446                                   journal_superblock_t *jsb,
 447                                   unsigned int *blockp, int blocksize,
 448                                   tid_t transaction)
 449 {
 450         int                     offset;
 451         char                    *tagp;
 452         journal_block_tag_t     *tag;
 453         unsigned int            blocknr;
 454         __u32                   tag_block;
 455         __u32                   tag_flags;
 456
 457
 458         offset = sizeof(journal_header_t);
 459         blocknr = *blockp;
 460
 461         if (dump_all)
 462                 fprintf(out_file, "Dumping descriptor block, sequence %u, at "
 463                         "block %u:\n", transaction, blocknr);
 464
 465         ++blocknr;
 466         WRAP(jsb, blocknr);
 467
 468         do {
 469                 /* Work out the location of the current tag, and skip to
 470                  * the next one... */
 471                 tagp = &buf[offset];
 472                 tag = (journal_block_tag_t *) tagp;
 473                 offset += sizeof(journal_block_tag_t);
 474
 475                 /* ... and if we have gone too far, then we've reached the
 476                    end of this block. */
 477                 if (offset > blocksize)
 478                         break;
 479
 480                 tag_block = be32_to_cpu(tag->t_blocknr);
 481                 tag_flags = be32_to_cpu(tag->t_flags);
 482
 483                 if (!(tag_flags & JFS_FLAG_SAME_UUID))
 484                         offset += 16;
 485
 486                 dump_metadata_block(out_file, source, jsb,
 487                                     blocknr, tag_block, blocksize,
 488                                     transaction);
 489
 490                 ++blocknr;
 491                 WRAP(jsb, blocknr);
 492
 493         } while (!(tag_flags & JFS_FLAG_LAST_TAG));
 494
 495         *blockp = blocknr;
 496 }
 497
 498
 499 static void dump_revoke_block(FILE *out_file, char *buf,
 500                                   journal_superblock_t *jsb,
 501                                   unsigned int blocknr, int blocksize,
 502                                   tid_t transaction)
 503 {
 504         int                     offset, max;
 505         journal_revoke_header_t *header;
 506         unsigned int            *entry, rblock;
 507
 508         if (dump_all)
 509                 fprintf(out_file, "Dumping revoke block, sequence %u, at "
 510                         "block %u:\n", transaction, blocknr);
 511
 512         header = (journal_revoke_header_t *) buf;
 513         offset = sizeof(journal_revoke_header_t);
 514         max = be32_to_cpu(header->r_count);
 515
 516         while (offset < max) {
 517                 entry = (unsigned int *) (buf + offset);
 518                 rblock = be32_to_cpu(*entry);
 519                 if (dump_all || rblock == block_to_dump) {
 520                         fprintf(out_file, "  Revoke FS block %u", rblock);
 521                         if (dump_all)
 522                                 fprintf(out_file, "\n");
 523                         else
 524                                 fprintf(out_file," at block %u, sequence %u\n",
 525                                         blocknr, transaction);
 526                 }
 527                 offset += 4;
 528         }
 529 }
 530
 531
 532 static void show_extent(FILE *out_file, int start_extent, int end_extent,
 533                         __u32 first_block)
 534 {
 535         if (start_extent >= 0 && first_block != 0)
 536                 fprintf(out_file, "(%d+%u): %u ",
 537                         start_extent, end_extent-start_extent, first_block);
 538 }
 539
 540 static void show_indirect(FILE *out_file, const char *name, __u32 where)
 541 {
 542         if (where)
 543                 fprintf(out_file, "(%s): %u ", name, where);
 544 }
 545
 546
 547 static void dump_metadata_block(FILE *out_file, struct journal_source *source,
 548                                 journal_superblock_t *jsb,
 549                                 unsigned int log_blocknr,
 550                                 unsigned int fs_blocknr,
 551                                 int blocksize,
 552                                 tid_t transaction)
 553 {
 554         unsigned int    got;
 555         int             retval;
 556         char            buf[8192];
 557
 558         if (!(dump_all
 559               || (fs_blocknr == block_to_dump)
 560               || (fs_blocknr == inode_block_to_dump)
 561               || (fs_blocknr == bitmap_to_dump)))
 562                 return;
 563
 564         fprintf(out_file, "  FS block %u logged at ", fs_blocknr);
 565         if (!dump_all)
 566                 fprintf(out_file, "sequence %u, ", transaction);
 567         fprintf(out_file, "journal block %u\n", log_blocknr);
 568
 569         /* There are two major special cases to parse:
 570          *
 571          * If this block is a block
 572          * bitmap block, we need to give it special treatment so that we
 573          * can log any allocates and deallocates which affect the
 574          * block_to_dump query block.
 575          *
 576          * If the block is an inode block for the inode being searched
 577          * for, then we need to dump the contents of that inode
 578          * structure symbolically.
 579          */
 580
 581         if (!(dump_contents && dump_all)
 582             && fs_blocknr != block_to_dump
 583             && fs_blocknr != bitmap_to_dump
 584             && fs_blocknr != inode_block_to_dump)
 585                 return;
 586
 587         retval = read_journal_block("logdump", source,
 588                                     blocksize * log_blocknr,
 589                                     buf, blocksize, &got);
 590         if (retval)
 591                 return;
 592
 593         if (fs_blocknr == bitmap_to_dump) {
 594                 struct ext2_super_block *super;
 595                 int offset;
 596
 597                 super = current_fs->super;
 598                 offset = ((fs_blocknr - super->s_first_data_block) %
 599                           super->s_blocks_per_group);
 600
 601                 fprintf(out_file, "    (block bitmap for block %u: "
 602                         "block is %s)\n",
 603                         block_to_dump,
 604                         ext2fs_test_bit(offset, buf) ? "SET" : "CLEAR");
 605         }
 606
 607         if (fs_blocknr == inode_block_to_dump) {
 608                 struct ext2_inode *inode;
 609                 int first, prev, this, start_extent, i;
 610
 611                 fprintf(out_file, "    (inode block for inode %u):\n",
 612                         inode_to_dump);
 613
 614                 inode = (struct ext2_inode *) (buf + inode_offset_to_dump);
 615                 internal_dump_inode(out_file, "    ", inode_to_dump, inode, 0);
 616
 617                 /* Dump out the direct/indirect blocks here:
 618                  * internal_dump_inode can only dump them from the main
 619                  * on-disk inode, not from the journaled copy of the
 620                  * inode. */
 621
 622                 fprintf (out_file, "    Blocks:  ");
 623                 first = prev = start_extent = -1;
 624
 625                 for (i=0; i<EXT2_NDIR_BLOCKS; i++) {
 626                         this = inode->i_block[i];
 627                         if (start_extent >= 0  && this == prev+1) {
 628                                 prev = this;
 629                                 continue;
 630                         } else {
 631                                 show_extent(out_file, start_extent, i, first);
 632                                 start_extent = i;
 633                                 first = prev = this;
 634                         }
 635                 }
 636                 show_extent(out_file, start_extent, i, first);
 637                 show_indirect(out_file, "IND", inode->i_block[i++]);
 638                 show_indirect(out_file, "DIND", inode->i_block[i++]);
 639                 show_indirect(out_file, "TIND", inode->i_block[i++]);
 640
 641                 fprintf(out_file, "\n");
 642         }
 643
 644         if (dump_contents)
 645                 do_hexdump(out_file, buf, blocksize);
 646
 647 }
 648
 649 static void do_hexdump (FILE *out_file, char *buf, int blocksize)
 650 {
 651         int i,j;
 652         int *intp;
 653         char *charp;
 654         unsigned char c;
 655
 656         intp = (int *) buf;
 657         charp = (char *) buf;
 658
 659         for (i=0; i<blocksize; i+=16) {
 660                 fprintf(out_file, "    %04x:  ", i);
 661                 for (j=0; j<16; j+=4)
 662                         fprintf(out_file, "%08x ", *intp++);
 663                 for (j=0; j<16; j++) {
 664                         c = *charp++;
 665                         if (c < ' ' || c >= 127)
 666                                 c = '.';
 667                         fprintf(out_file, "%c", c);
 668                 }
 669                 fprintf(out_file, "\n");
 670         }
 671 }
 672