e2fsck/journal.c

   1 /*
   2  * journal.c --- code for handling the "ext3" journal
   3  *
   4  * Copyright (C) 2000 Andreas Dilger
   5  * Copyright (C) 2000 Theodore Ts'o
   6  *
   7  * Parts of the code are based on fs/jfs/journal.c by Stephen C. Tweedie
   8  * Copyright (C) 1999 Red Hat Software
   9  *
  10  * This file may be redistributed under the terms of the
  11  * GNU General Public License version 2 or at your discretion
  12  * any later version.
  13  */
  14
  15 #ifdef HAVE_SYS_MOUNT_H
  16 #include <sys/mount.h>
  17 #define MNT_FL (MS_MGC_VAL | MS_RDONLY)
  18 #endif
  19 #ifdef HAVE_SYS_STAT_H
  20 #include <sys/stat.h>
  21 #endif
  22
  23 #define E2FSCK_INCLUDE_INLINE_FUNCS
  24 #include "jfs_user.h"
  25 #include "problem.h"
  26 #include "uuid/uuid.h"
  27
  28 #ifdef JFS_DEBUG
  29 static int bh_count = 0;
  30 int journal_enable_debug = 0;
  31 #endif
  32
  33 /* Kernel compatibility functions for handling the journal.  These allow us
  34  * to use the recovery.c file virtually unchanged from the kernel, so we
  35  * don't have to do much to keep kernel and user recovery in sync.
  36  */
  37 int bmap(struct inode *inode, int block)
  38 {
  39         int retval;
  40         blk_t phys;
  41
  42         retval = ext2fs_bmap(inode->i_ctx->fs, inode->i_ino, &inode->i_ext2,
  43                              NULL, 0, block, &phys);
  44
  45         if (retval)
  46                 com_err(inode->i_ctx->device_name, retval,
  47                         _("bmap journal inode %ld, block %d\n"),
  48                         inode->i_ino, block);
  49
  50         return phys;
  51 }
  52
  53 struct buffer_head *getblk(e2fsck_t ctx, blk_t blocknr, int blocksize)
  54 {
  55         struct buffer_head *bh;
  56
  57         bh = e2fsck_allocate_memory(ctx, sizeof(*bh), "block buffer");
  58         if (!bh)
  59                 return NULL;
  60
  61         jfs_debug(4, "getblk for block %lu (%d bytes)(total %d)\n",
  62                   (unsigned long) blocknr, blocksize, ++bh_count);
  63
  64         bh->b_ctx = ctx;
  65         bh->b_size = blocksize;
  66         bh->b_blocknr = blocknr;
  67
  68         return bh;
  69 }
  70
  71 void ll_rw_block(int rw, int nr, struct buffer_head *bhp[])
  72 {
  73         int retval;
  74         struct buffer_head *bh;
  75
  76         for (; nr > 0; --nr) {
  77                 bh = *bhp++;
  78                 if (rw == READ && !bh->b_uptodate) {
  79                         jfs_debug(3, "reading block %lu/%p\n",
  80                                   (unsigned long) bh->b_blocknr, (void *) bh);
  81                         retval = io_channel_read_blk(bh->b_ctx->fs->io,
  82                                                      bh->b_blocknr,
  83                                                      1, bh->b_data);
  84                         if (retval) {
  85                                 com_err(bh->b_ctx->device_name, retval,
  86                                         "while reading block %ld\n",
  87                                         bh->b_blocknr);
  88                                 bh->b_err = retval;
  89                                 continue;
  90                         }
  91                         bh->b_uptodate = 1;
  92                 } else if (rw == WRITE && bh->b_dirty) {
  93                         jfs_debug(3, "writing block %lu/%p\n",
  94                                   (unsigned long) bh->b_blocknr, (void *) bh);
  95                         retval = io_channel_write_blk(bh->b_ctx->fs->io,
  96                                                       bh->b_blocknr,
  97                                                       1, bh->b_data);
  98                         if (retval) {
  99                                 com_err(bh->b_ctx->device_name, retval,
 100                                         "while writing block %ld\n",
 101                                         bh->b_blocknr);
 102                                 bh->b_err = retval;
 103                                 continue;
 104                         }
 105                         bh->b_dirty = 0;
 106                         bh->b_uptodate = 1;
 107                 } else
 108                         jfs_debug(3, "no-op %s for block %lu\n",
 109                                   rw == READ ? "read" : "write",
 110                                   (unsigned long) bh->b_blocknr);
 111         }
 112 }
 113
 114 void mark_buffer_dirty(struct buffer_head *bh, int dummy)
 115 {
 116         bh->b_dirty = dummy | 1; /* use dummy to avoid unused variable */
 117 }
 118
 119 static void mark_buffer_clean(struct buffer_head * bh)
 120 {
 121         bh->b_dirty = 0;
 122 }
 123
 124 void brelse(struct buffer_head *bh)
 125 {
 126         if (bh->b_dirty)
 127                 ll_rw_block(WRITE, 1, &bh);
 128         jfs_debug(3, "freeing block %lu/%p (total %d)\n",
 129                   (unsigned long) bh->b_blocknr, (void *) bh, --bh_count);
 130         ext2fs_free_mem((void **) &bh);
 131 }
 132
 133 int buffer_uptodate(struct buffer_head *bh)
 134 {
 135         return bh->b_uptodate;
 136 }
 137
 138 void wait_on_buffer(struct buffer_head *bh)
 139 {
 140         if (!bh->b_uptodate)
 141                 ll_rw_block(READ, 1, &bh);
 142 }
 143
 144
 145 static void e2fsck_clear_recover(e2fsck_t ctx, int error)
 146 {
 147         ctx->fs->super->s_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER;
 148
 149         /* if we had an error doing journal recovery, we need a full fsck */
 150         if (error)
 151                 ctx->fs->super->s_state &= ~EXT2_VALID_FS;
 152         ext2fs_mark_super_dirty(ctx->fs);
 153 }
 154
 155 static errcode_t e2fsck_journal_init_inode(e2fsck_t ctx,
 156                                            struct ext2_super_block *s,
 157                                            ext2_ino_t journal_inum,
 158                                            journal_t **journal)
 159 {
 160         struct inode *inode;
 161         struct buffer_head *bh;
 162         blk_t start;
 163         int retval;
 164
 165         jfs_debug(1, "Using journal inode %u\n", journal_inum);
 166         *journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal");
 167         if (!*journal) {
 168                 return EXT2_ET_NO_MEMORY;
 169         }
 170
 171         inode = e2fsck_allocate_memory(ctx, sizeof(*inode), "journal inode");
 172         if (!inode) {
 173                 retval = EXT2_ET_NO_MEMORY;
 174                 goto exit_journal;
 175         }
 176
 177         inode->i_ctx = ctx;
 178         inode->i_ino = journal_inum;
 179         retval = ext2fs_read_inode(ctx->fs, journal_inum, &inode->i_ext2);
 180         if (retval)
 181                 goto exit_inode;
 182
 183         (*journal)->j_dev = ctx;
 184         (*journal)->j_inode = inode;
 185         (*journal)->j_blocksize = ctx->fs->blocksize;
 186         (*journal)->j_maxlen = inode->i_ext2.i_size / (*journal)->j_blocksize;
 187
 188         if (!inode->i_ext2.i_links_count ||
 189             !LINUX_S_ISREG(inode->i_ext2.i_mode) ||
 190             (*journal)->j_maxlen < JFS_MIN_JOURNAL_BLOCKS ||
 191             (start = bmap(inode, 0)) == 0) {
 192                 retval = EXT2_ET_BAD_INODE_NUM;
 193                 goto exit_inode;
 194         }
 195
 196         bh = getblk(ctx, start, (*journal)->j_blocksize);
 197         if (!bh) {
 198                 retval = EXT2_ET_NO_MEMORY;
 199                 goto exit_inode;
 200         }
 201         (*journal)->j_sb_buffer = bh;
 202         (*journal)->j_superblock = (journal_superblock_t *)bh->b_data;
 203
 204         return 0;
 205
 206 exit_inode:
 207         ext2fs_free_mem((void **)&inode);
 208 exit_journal:
 209         ext2fs_free_mem((void **)journal);
 210
 211         return retval;
 212 }
 213
 214 static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **journal)
 215 {
 216         char uuid_str[40];
 217         struct problem_context pctx;
 218         struct ext2_super_block *sb = ctx->fs->super;
 219
 220         clear_problem_context(&pctx);
 221
 222         if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
 223                 /* FIXME: check if dev is valid block dev, has a journal */
 224                 if (sb->s_journal_dev) {
 225                         pctx.num = sb->s_journal_dev;
 226                         /* this problem aborts on -y, -p, unsupported on -n */
 227                         if (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_DEV, &pctx))
 228                                 return EXT2_ET_UNSUPP_FEATURE;
 229                         sb->s_journal_dev = 0;
 230                         sb->s_state &= ~EXT2_VALID_FS;
 231                         ext2fs_mark_super_dirty(ctx->fs);
 232                 }
 233                 /* FIXME: check if UUID is valid block dev, has a journal */
 234                 if (!uuid_is_null(sb->s_journal_uuid)) {
 235                         uuid_unparse(sb->s_journal_uuid, uuid_str);
 236                         pctx.str = uuid_str;
 237                         /* this problem aborts on -y, -p, unsupported on -n */
 238                         if (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_UUID, &pctx))
 239                                 return EXT2_ET_UNSUPP_FEATURE;
 240                         uuid_clear(sb->s_journal_uuid);
 241                         sb->s_state &= ~EXT2_VALID_FS;
 242                         ext2fs_mark_super_dirty(ctx->fs);
 243                 }
 244                 if (!sb->s_journal_inum)
 245                         return EXT2_ET_BAD_INODE_NUM;
 246         }
 247
 248         if (sb->s_journal_dev) {
 249                 pctx.num = sb->s_journal_dev;
 250                 if (!fix_problem(ctx, PR_0_JOURNAL_BAD_DEV, &pctx))
 251                         return EXT2_ET_UNSUPP_FEATURE;
 252                 sb->s_journal_dev = 0;
 253                 sb->s_state &= ~EXT2_VALID_FS;
 254                 ext2fs_mark_super_dirty(ctx->fs);
 255         }
 256         if (!uuid_is_null(sb->s_journal_uuid)) {
 257                 uuid_unparse(sb->s_journal_uuid, uuid_str);
 258                 pctx.str = uuid_str;
 259                 if (!fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx))
 260                         return EXT2_ET_UNSUPP_FEATURE;
 261                 uuid_clear(sb->s_journal_uuid);
 262                 sb->s_state &= ~EXT2_VALID_FS;
 263                 ext2fs_mark_super_dirty(ctx->fs);
 264         }
 265
 266         return e2fsck_journal_init_inode(ctx, sb, sb->s_journal_inum, journal);
 267 }
 268
 269 static errcode_t e2fsck_journal_fix_bad_inode(e2fsck_t ctx,
 270                                               struct problem_context *pctx)
 271 {
 272         struct ext2_super_block *sb = ctx->fs->super;
 273         int recover = ctx->fs->super->s_feature_incompat &
 274                 EXT3_FEATURE_INCOMPAT_RECOVER;
 275         int has_journal = ctx->fs->super->s_feature_compat &
 276                 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 277
 278         if (has_journal || sb->s_journal_inum) {
 279                 /* The journal inode is bogus, remove and force full fsck */
 280                 pctx->ino = sb->s_journal_inum;
 281                 if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) {
 282                         if (has_journal && sb->s_journal_inum)
 283                                 printf("*** ext3 journal has been deleted - "
 284                                        "filesystem is now ext2 only ***\n\n");
 285                         sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 286                         sb->s_journal_inum = 0;
 287                         e2fsck_clear_recover(ctx, 1);
 288                         return 0;
 289                 }
 290                 return EXT2_ET_BAD_INODE_NUM;
 291         } else if (recover) {
 292                 if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) {
 293                         e2fsck_clear_recover(ctx, 1);
 294                         return 0;
 295                 }
 296                 return EXT2_ET_UNSUPP_FEATURE;
 297         }
 298         return 0;
 299 }
 300
 301 static errcode_t e2fsck_journal_load(journal_t *journal)
 302 {
 303         e2fsck_t ctx = journal->j_dev;
 304         journal_superblock_t *jsb;
 305         struct buffer_head *jbh = journal->j_sb_buffer;
 306         struct problem_context pctx;
 307
 308         clear_problem_context(&pctx);
 309
 310         ll_rw_block(READ, 1, &jbh);
 311         if (jbh->b_err) {
 312                 com_err(ctx->device_name, jbh->b_err,
 313                         _("reading journal superblock\n"));
 314                 return jbh->b_err;
 315         }
 316
 317         jsb = journal->j_superblock;
 318         /* If we don't even have JFS_MAGIC, we probably have a wrong inode */
 319         if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER))
 320                 return e2fsck_journal_fix_bad_inode(ctx, &pctx);
 321
 322         switch (ntohl(jsb->s_header.h_blocktype)) {
 323         case JFS_SUPERBLOCK_V1:
 324                 journal->j_format_version = 1;
 325                 break;
 326
 327         case JFS_SUPERBLOCK_V2:
 328                 journal->j_format_version = 2;
 329                 break;
 330
 331         /* If we don't understand the superblock major type, but there
 332          * is a magic number, then it is likely to be a new format we
 333          * just don't understand, so leave it alone. */
 334         default:
 335                 com_err(ctx->program_name, EXT2_ET_UNSUPP_FEATURE,
 336                         _("%s: journal has unrecognised format\n"),
 337                         ctx->device_name);
 338                 return EXT2_ET_UNSUPP_FEATURE;
 339         }
 340
 341         if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES)) {
 342                 com_err(ctx->program_name, EXT2_ET_UNSUPP_FEATURE,
 343                         _("%s: journal has incompatible features\n"),
 344                         ctx->device_name);
 345                 return EXT2_ET_UNSUPP_FEATURE;
 346         }
 347
 348         if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES)) {
 349                 com_err(ctx->program_name, EXT2_ET_UNSUPP_FEATURE,
 350                         _("%s: journal has readonly-incompatible features\n"),
 351                         ctx->device_name);
 352                 return EXT2_ET_RO_UNSUPP_FEATURE;
 353         }
 354
 355         /* We have now checked whether we know enough about the journal
 356          * format to be able to proceed safely, so any other checks that
 357          * fail we should attempt to recover from. */
 358         if (jsb->s_blocksize != htonl(journal->j_blocksize)) {
 359                 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK,
 360                         _("%s: no valid journal superblock found\n"),
 361                         ctx->device_name);
 362                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 363         }
 364
 365         if (ntohl(jsb->s_maxlen) < journal->j_maxlen)
 366                 journal->j_maxlen = ntohl(jsb->s_maxlen);
 367         else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) {
 368                 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK,
 369                         _("%s: journal too short\n"),
 370                         ctx->device_name);
 371                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 372         }
 373
 374         journal->j_tail_sequence = ntohl(jsb->s_sequence);
 375         journal->j_transaction_sequence = journal->j_tail_sequence;
 376         journal->j_tail = ntohl(jsb->s_start);
 377         journal->j_first = ntohl(jsb->s_first);
 378         journal->j_last = ntohl(jsb->s_maxlen);
 379
 380         return 0;
 381 }
 382
 383 static void e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb,
 384                                        journal_t *journal)
 385 {
 386         char *p;
 387
 388         /* Leave a valid existing V1 superblock signature alone.
 389          * Anything unrecognisable we overwrite with a new V2
 390          * signature. */
 391
 392         if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER) ||
 393             jsb->s_header.h_blocktype != htonl(JFS_SUPERBLOCK_V1)) {
 394                 jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER);
 395                 jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2);
 396         }
 397
 398         /* Zero out everything else beyond the superblock header */
 399
 400         p = ((char *) jsb) + sizeof(journal_header_t);
 401         memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t));
 402
 403         jsb->s_blocksize = htonl(ctx->fs->blocksize);
 404         jsb->s_maxlen = htonl(journal->j_maxlen);
 405         jsb->s_first = htonl(1);
 406         jsb->s_sequence = htonl(1);
 407
 408         /* In theory we should also re-zero the entire journal here.
 409          * Initialising s_sequence to a random value would be a
 410          * reasonable compromise. */
 411
 412         ll_rw_block(WRITE, 1, &journal->j_sb_buffer);
 413 }
 414
 415 static errcode_t e2fsck_journal_fix_corrupt_super(e2fsck_t ctx,
 416                                                   journal_t *journal,
 417                                                   struct problem_context *pctx)
 418 {
 419         struct ext2_super_block *sb = ctx->fs->super;
 420         int recover = ctx->fs->super->s_feature_incompat &
 421                 EXT3_FEATURE_INCOMPAT_RECOVER;
 422
 423         pctx->num = journal->j_inode->i_ino;
 424
 425         if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
 426                 if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) {
 427                         e2fsck_journal_reset_super(ctx, journal->j_superblock,
 428                                                    journal);
 429                         journal->j_transaction_sequence = 1;
 430                         e2fsck_clear_recover(ctx, recover);
 431                         return 0;
 432                 }
 433                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 434         } else if (e2fsck_journal_fix_bad_inode(ctx, pctx))
 435                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 436
 437         return 0;
 438 }
 439
 440 static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal,
 441                                    int reset, int drop)
 442 {
 443         journal_superblock_t *jsb;
 444
 445         if (drop)
 446                 mark_buffer_clean(journal->j_sb_buffer);
 447         else if (!(ctx->options & E2F_OPT_READONLY)) {
 448                 jsb = journal->j_superblock;
 449                 jsb->s_sequence = htonl(journal->j_transaction_sequence);
 450                 if (reset)
 451                         jsb->s_start = 0; /* this marks the journal as empty */
 452                 mark_buffer_dirty(journal->j_sb_buffer, 1);
 453         }
 454         brelse(journal->j_sb_buffer);
 455
 456         if (journal->j_inode)
 457                 ext2fs_free_mem((void **)&journal->j_inode);
 458         ext2fs_free_mem((void **)&journal);
 459 }
 460
 461 /*
 462  * This function makes sure that the superblock fields regarding the
 463  * journal are consistent.
 464  */
 465 int e2fsck_check_ext3_journal(e2fsck_t ctx)
 466 {
 467         struct ext2_super_block *sb = ctx->fs->super;
 468         journal_t *journal;
 469         int recover = ctx->fs->super->s_feature_incompat &
 470                 EXT3_FEATURE_INCOMPAT_RECOVER;
 471         struct problem_context pctx;
 472         int reset = 0, force_fsck = 0;
 473         int retval;
 474
 475         /* If we don't have any journal features, don't do anything more */
 476         if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
 477             !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 &&
 478             uuid_is_null(sb->s_journal_uuid))
 479                 return 0;
 480
 481 #ifdef JFS_DEBUG                /* Enabled by configure --enable-jfs-debug */
 482         journal_enable_debug = 2;
 483 #endif
 484         clear_problem_context(&pctx);
 485         pctx.num = sb->s_journal_inum;
 486
 487         retval = e2fsck_get_journal(ctx, &journal);
 488         if (retval) {
 489                 if (retval == EXT2_ET_BAD_INODE_NUM)
 490                         return e2fsck_journal_fix_bad_inode(ctx, &pctx);
 491                 return retval;
 492         }
 493
 494         retval = e2fsck_journal_load(journal);
 495         if (retval) {
 496                 if (retval == EXT2_ET_CORRUPT_SUPERBLOCK)
 497                         retval = e2fsck_journal_fix_corrupt_super(ctx, journal,
 498                                                                   &pctx);
 499                 e2fsck_journal_release(ctx, journal, 0, 1);
 500                 return retval;
 501         }
 502
 503         /*
 504          * We want to make the flags consistent here.  We will not leave with
 505          * needs_recovery set but has_journal clear.  We can't get in a loop
 506          * with -y, -n, or -p, only if a user isn't making up their mind.
 507          */
 508 no_has_journal:
 509         if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
 510                 recover = sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER;
 511                 pctx.str = "inode";
 512                 if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) {
 513                         if (recover &&
 514                             !fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx))
 515                                 goto no_has_journal;
 516                         /*
 517                          * Need a full fsck if we are releasing a
 518                          * journal stored on a reserved inode.
 519                          */
 520                         force_fsck = recover ||
 521                                 (sb->s_journal_inum < EXT2_FIRST_INODE(sb));
 522                         /* Clear all of the journal fields */
 523                         sb->s_journal_inum = 0;
 524                         sb->s_journal_dev = 0;
 525                         memset(sb->s_journal_uuid, 0,
 526                                sizeof(sb->s_journal_uuid));
 527                         e2fsck_clear_recover(ctx, force_fsck);
 528                 } else if (!(ctx->options & E2F_OPT_READONLY)) {
 529                         sb->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 530                         ext2fs_mark_super_dirty(ctx->fs);
 531                 }
 532         }
 533
 534         if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL &&
 535             !(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) &&
 536             journal->j_superblock->s_start != 0) {
 537                 if (fix_problem(ctx, PR_0_JOURNAL_RESET_JOURNAL, &pctx)) {
 538                         reset = 1;
 539                         sb->s_state &= ~EXT2_VALID_FS;
 540                         ext2fs_mark_super_dirty(ctx->fs);
 541                 }
 542                 /*
 543                  * If the user answers no to the above question, we
 544                  * ignore the fact that journal apparently has data;
 545                  * accidentally replaying over valid data would be far
 546                  * worse than skipping a questionable recovery.
 547                  *
 548                  * XXX should we abort with a fatal error here?  What
 549                  * will the ext3 kernel code do if a filesystem with
 550                  * !NEEDS_RECOVERY but with a non-zero
 551                  * journal->j_superblock->s_start is mounted?
 552                  */
 553         }
 554
 555         e2fsck_journal_release(ctx, journal, reset, 0);
 556         return retval;
 557 }
 558
 559 static errcode_t recover_ext3_journal(e2fsck_t ctx)
 560 {
 561         journal_t *journal;
 562         int retval;
 563
 564         retval = e2fsck_get_journal(ctx, &journal);
 565         if (retval)
 566                 return retval;
 567
 568         retval = e2fsck_journal_load(journal);
 569         if (retval)
 570                 goto errout;
 571
 572         retval = journal_init_revoke(journal, 1024);
 573         if (retval)
 574                 goto errout;
 575
 576         retval = -journal_recover(journal);
 577 errout:
 578         e2fsck_journal_release(ctx, journal, 1, 0);
 579         return retval;
 580 }
 581
 582
 583 #if 0
 584 #define TEMPLATE "/tmp/ext3.XXXXXX"
 585
 586 /*
 587  * This function attempts to mount and unmount an ext3 filesystem,
 588  * which is a cheap way to force the kernel to run the journal and
 589  * handle the recovery for us.
 590  */
 591 static errcode_t recover_ext3_journal_via_mount(e2fsck_t ctx)
 592 {
 593         ext2_filsys fs = ctx->fs;
 594         char    *dirlist[] = {"/mnt","/lost+found","/tmp","/root","/boot",0};
 595         errcode_t        retval, retval2;
 596         int      count = 0;
 597         char     template[] = TEMPLATE;
 598         struct stat buf;
 599         char    *tmpdir;
 600
 601         if (ctx->options & E2F_OPT_READONLY) {
 602                 printf("%s: won't do journal recovery while read-only\n",
 603                        ctx->device_name);
 604                 return EXT2_ET_FILE_RO;
 605         }
 606
 607         printf(_("%s: trying for ext3 kernel journal recovery\n"),
 608                ctx->device_name);
 609         /*
 610          * First try to make a temporary directory.  This may fail if
 611          * the root partition is still mounted read-only.
 612          */
 613 newtemp:
 614         tmpdir = mktemp(template);
 615         if (tmpdir) {
 616                 jfs_debug(2, "trying %s as ext3 temp mount point\n", tmpdir);
 617                 if (mkdir(template, 0700)) {
 618                         if (errno == EROFS) {
 619                                 tmpdir = NULL;
 620                                 template[0] = '\0';
 621                         } else if (errno == EEXIST && count++ < 10) {
 622                                 strcpy(template, TEMPLATE);
 623                                 goto newtemp;
 624                         }
 625                         return errno;
 626                 }
 627         }
 628
 629         /*
 630          * OK, creating a temporary directory didn't work.
 631          * Let's try a list of possible temporary mountpoints.
 632          */
 633         if (!tmpdir) {
 634                 dev_t   rootdev;
 635                 char    **cpp, *dir;
 636
 637                 if (stat("/", &buf))
 638                         return errno;
 639
 640                 rootdev = buf.st_dev;
 641
 642                 /*
 643                  * Check that dir is on the same device as root (no other
 644                  * filesystem is mounted there), and it's a directory.
 645                  */
 646                 for (cpp = dirlist; (dir = *cpp); cpp++)
 647                         if (stat(dir, &buf) == 0 && buf.st_dev == rootdev &&
 648                             S_ISDIR(buf.st_mode)) {
 649                                 tmpdir = dir;
 650                                 break;
 651                         }
 652         }
 653
 654         if (tmpdir) {
 655                 io_manager      io_ptr = fs->io->manager;
 656                 int             blocksize = fs->blocksize;
 657
 658                 jfs_debug(2, "using %s for ext3 mount\n", tmpdir);
 659                 /* FIXME - need to handle loop devices here */
 660                 if (mount(ctx->device_name, tmpdir, "ext3", MNT_FL, NULL)) {
 661                         retval = errno;
 662                         com_err(ctx->program_name, errno,
 663                                 "when mounting %s", ctx->device_name);
 664                         if (template[0])
 665                                 rmdir(tmpdir);
 666                         return retval;
 667                 }
 668                 /*
 669                  * Now that it mounted cleanly, the filesystem will have been
 670                  * recovered, so we can now unmount it.
 671                  */
 672                 if (umount(tmpdir))
 673                         return errno;
 674
 675                 /*
 676                  * Remove the temporary directory, if it was created.
 677                  */
 678                 if (template[0])
 679                         rmdir(tmpdir);
 680                 return 0;
 681         }
 682 }
 683 #endif
 684
 685 int e2fsck_run_ext3_journal(e2fsck_t ctx)
 686 {
 687         io_manager io_ptr = ctx->fs->io->manager;
 688         int blocksize = ctx->fs->blocksize;
 689         errcode_t       retval, recover_retval;
 690
 691         printf(_("%s: recovering journal\n"), ctx->device_name);
 692         if (ctx->options & E2F_OPT_READONLY) {
 693                 printf(_("%s: won't do journal recovery while read-only\n"),
 694                        ctx->device_name);
 695                 return EXT2_ET_FILE_RO;
 696         }
 697
 698         ext2fs_flush(ctx->fs);  /* Force out any modifications */
 699
 700         recover_retval = recover_ext3_journal(ctx);
 701
 702         /*
 703          * Reload the filesystem context to get up-to-date data from disk
 704          * because journal recovery will change the filesystem under us.
 705          */
 706         ext2fs_close(ctx->fs);
 707         retval = ext2fs_open(ctx->filesystem_name, EXT2_FLAG_RW,
 708                              ctx->superblock, blocksize, io_ptr,
 709                              &ctx->fs);
 710
 711         if (retval) {
 712                 com_err(ctx->program_name, retval,
 713                         _("while trying to re-open %s"),
 714                         ctx->device_name);
 715                 fatal_error(ctx, 0);
 716         }
 717         ctx->fs->priv_data = ctx;
 718
 719         /* Set the superblock flags */
 720         e2fsck_clear_recover(ctx, recover_retval);
 721         return recover_retval;
 722 }