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                /* Enabled by configure --enable-jfs-debug */
  29 static int bh_count = 0;
  30 int journal_enable_debug = 2;
  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 mark_buffer_uptodate(struct buffer_head *bh, int val)
 139 {
 140         bh->b_uptodate = val;
 141 }
 142
 143 void wait_on_buffer(struct buffer_head *bh)
 144 {
 145         if (!bh->b_uptodate)
 146                 ll_rw_block(READ, 1, &bh);
 147 }
 148
 149
 150 static void e2fsck_clear_recover(e2fsck_t ctx, int error)
 151 {
 152         ctx->fs->super->s_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER;
 153
 154         /* if we had an error doing journal recovery, we need a full fsck */
 155         if (error)
 156                 ctx->fs->super->s_state &= ~EXT2_VALID_FS;
 157         ext2fs_mark_super_dirty(ctx->fs);
 158 }
 159
 160 static errcode_t e2fsck_journal_init_inode(e2fsck_t ctx,
 161                                            struct ext2_super_block *s,
 162                                            ext2_ino_t journal_inum,
 163                                            journal_t **journal)
 164 {
 165         struct inode *inode;
 166         struct buffer_head *bh;
 167         blk_t start;
 168         int retval;
 169
 170         jfs_debug(1, "Using journal inode %u\n", journal_inum);
 171         *journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal");
 172         if (!*journal) {
 173                 return EXT2_ET_NO_MEMORY;
 174         }
 175
 176         inode = e2fsck_allocate_memory(ctx, sizeof(*inode), "journal inode");
 177         if (!inode) {
 178                 retval = EXT2_ET_NO_MEMORY;
 179                 goto exit_journal;
 180         }
 181
 182         inode->i_ctx = ctx;
 183         inode->i_ino = journal_inum;
 184         retval = ext2fs_read_inode(ctx->fs, journal_inum, &inode->i_ext2);
 185         if (retval)
 186                 goto exit_inode;
 187
 188         (*journal)->j_dev = ctx;
 189         (*journal)->j_inode = inode;
 190         (*journal)->j_blocksize = ctx->fs->blocksize;
 191         (*journal)->j_maxlen = inode->i_ext2.i_size / (*journal)->j_blocksize;
 192
 193         if (!inode->i_ext2.i_links_count ||
 194             !LINUX_S_ISREG(inode->i_ext2.i_mode) ||
 195             (*journal)->j_maxlen < JFS_MIN_JOURNAL_BLOCKS ||
 196             (start = bmap(inode, 0)) == 0) {
 197                 retval = EXT2_ET_BAD_INODE_NUM;
 198                 goto exit_inode;
 199         }
 200
 201         bh = getblk(ctx, start, (*journal)->j_blocksize);
 202         if (!bh) {
 203                 retval = EXT2_ET_NO_MEMORY;
 204                 goto exit_inode;
 205         }
 206         (*journal)->j_sb_buffer = bh;
 207         (*journal)->j_superblock = (journal_superblock_t *)bh->b_data;
 208
 209         return 0;
 210
 211 exit_inode:
 212         ext2fs_free_mem((void **)&inode);
 213 exit_journal:
 214         ext2fs_free_mem((void **)journal);
 215
 216         return retval;
 217 }
 218
 219 static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **journal)
 220 {
 221         char uuid_str[40];
 222         struct problem_context pctx;
 223         struct ext2_super_block *sb = ctx->fs->super;
 224
 225         clear_problem_context(&pctx);
 226
 227         if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
 228                 /* FIXME: check if dev is valid block dev, has a journal */
 229                 if (sb->s_journal_dev) {
 230                         pctx.num = sb->s_journal_dev;
 231                         /* this problem aborts on -y, -p, unsupported on -n */
 232                         if (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_DEV, &pctx))
 233                                 return EXT2_ET_UNSUPP_FEATURE;
 234                         sb->s_journal_dev = 0;
 235                         sb->s_state &= ~EXT2_VALID_FS;
 236                         ext2fs_mark_super_dirty(ctx->fs);
 237                 }
 238                 /* FIXME: check if UUID is valid block dev, has a journal */
 239                 if (!uuid_is_null(sb->s_journal_uuid)) {
 240                         uuid_unparse(sb->s_journal_uuid, uuid_str);
 241                         pctx.str = uuid_str;
 242                         /* this problem aborts on -y, -p, unsupported on -n */
 243                         if (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_UUID, &pctx))
 244                                 return EXT2_ET_UNSUPP_FEATURE;
 245                         uuid_clear(sb->s_journal_uuid);
 246                         sb->s_state &= ~EXT2_VALID_FS;
 247                         ext2fs_mark_super_dirty(ctx->fs);
 248                 }
 249                 if (!sb->s_journal_inum)
 250                         return EXT2_ET_BAD_INODE_NUM;
 251         }
 252
 253         if (sb->s_journal_dev) {
 254                 pctx.num = sb->s_journal_dev;
 255                 if (!fix_problem(ctx, PR_0_JOURNAL_BAD_DEV, &pctx))
 256                         return EXT2_ET_UNSUPP_FEATURE;
 257                 sb->s_journal_dev = 0;
 258                 sb->s_state &= ~EXT2_VALID_FS;
 259                 ext2fs_mark_super_dirty(ctx->fs);
 260         }
 261         if (!uuid_is_null(sb->s_journal_uuid)) {
 262                 uuid_unparse(sb->s_journal_uuid, uuid_str);
 263                 pctx.str = uuid_str;
 264                 if (!fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx))
 265                         return EXT2_ET_UNSUPP_FEATURE;
 266                 uuid_clear(sb->s_journal_uuid);
 267                 sb->s_state &= ~EXT2_VALID_FS;
 268                 ext2fs_mark_super_dirty(ctx->fs);
 269         }
 270
 271         return e2fsck_journal_init_inode(ctx, sb, sb->s_journal_inum, journal);
 272 }
 273
 274 static errcode_t e2fsck_journal_fix_bad_inode(e2fsck_t ctx,
 275                                               struct problem_context *pctx)
 276 {
 277         struct ext2_super_block *sb = ctx->fs->super;
 278         int recover = ctx->fs->super->s_feature_incompat &
 279                 EXT3_FEATURE_INCOMPAT_RECOVER;
 280         int has_journal = ctx->fs->super->s_feature_compat &
 281                 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 282
 283         if (has_journal || sb->s_journal_inum) {
 284                 /* The journal inode is bogus, remove and force full fsck */
 285                 pctx->ino = sb->s_journal_inum;
 286                 if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) {
 287                         if (has_journal && sb->s_journal_inum)
 288                                 printf("*** ext3 journal has been deleted - "
 289                                        "filesystem is now ext2 only ***\n\n");
 290                         sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 291                         sb->s_journal_inum = 0;
 292                         e2fsck_clear_recover(ctx, 1);
 293                         return 0;
 294                 }
 295                 return EXT2_ET_BAD_INODE_NUM;
 296         } else if (recover) {
 297                 if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) {
 298                         e2fsck_clear_recover(ctx, 1);
 299                         return 0;
 300                 }
 301                 return EXT2_ET_UNSUPP_FEATURE;
 302         }
 303         return 0;
 304 }
 305
 306 static errcode_t e2fsck_journal_load(journal_t *journal)
 307 {
 308         e2fsck_t ctx = journal->j_dev;
 309         journal_superblock_t *jsb;
 310         struct buffer_head *jbh = journal->j_sb_buffer;
 311         struct problem_context pctx;
 312
 313         clear_problem_context(&pctx);
 314
 315         ll_rw_block(READ, 1, &jbh);
 316         if (jbh->b_err) {
 317                 com_err(ctx->device_name, jbh->b_err,
 318                         _("reading journal superblock\n"));
 319                 return jbh->b_err;
 320         }
 321
 322         jsb = journal->j_superblock;
 323         /* If we don't even have JFS_MAGIC, we probably have a wrong inode */
 324         if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER))
 325                 return e2fsck_journal_fix_bad_inode(ctx, &pctx);
 326
 327         switch (ntohl(jsb->s_header.h_blocktype)) {
 328         case JFS_SUPERBLOCK_V1:
 329                 journal->j_format_version = 1;
 330                 break;
 331
 332         case JFS_SUPERBLOCK_V2:
 333                 journal->j_format_version = 2;
 334                 break;
 335
 336         /* If we don't understand the superblock major type, but there
 337          * is a magic number, then it is likely to be a new format we
 338          * just don't understand, so leave it alone. */
 339         default:
 340                 com_err(ctx->program_name, EXT2_ET_UNSUPP_FEATURE,
 341                         _("%s: journal has unrecognised format\n"),
 342                         ctx->device_name);
 343                 return EXT2_ET_UNSUPP_FEATURE;
 344         }
 345
 346         if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES)) {
 347                 com_err(ctx->program_name, EXT2_ET_UNSUPP_FEATURE,
 348                         _("%s: journal has incompatible features\n"),
 349                         ctx->device_name);
 350                 return EXT2_ET_UNSUPP_FEATURE;
 351         }
 352
 353         if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES)) {
 354                 com_err(ctx->program_name, EXT2_ET_UNSUPP_FEATURE,
 355                         _("%s: journal has readonly-incompatible features\n"),
 356                         ctx->device_name);
 357                 return EXT2_ET_RO_UNSUPP_FEATURE;
 358         }
 359
 360         /* We have now checked whether we know enough about the journal
 361          * format to be able to proceed safely, so any other checks that
 362          * fail we should attempt to recover from. */
 363         if (jsb->s_blocksize != htonl(journal->j_blocksize)) {
 364                 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK,
 365                         _("%s: no valid journal superblock found\n"),
 366                         ctx->device_name);
 367                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 368         }
 369
 370         if (ntohl(jsb->s_maxlen) < journal->j_maxlen)
 371                 journal->j_maxlen = ntohl(jsb->s_maxlen);
 372         else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) {
 373                 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK,
 374                         _("%s: journal too short\n"),
 375                         ctx->device_name);
 376                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 377         }
 378
 379         journal->j_tail_sequence = ntohl(jsb->s_sequence);
 380         journal->j_transaction_sequence = journal->j_tail_sequence;
 381         journal->j_tail = ntohl(jsb->s_start);
 382         journal->j_first = ntohl(jsb->s_first);
 383         journal->j_last = ntohl(jsb->s_maxlen);
 384
 385         return 0;
 386 }
 387
 388 static void e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb,
 389                                        journal_t *journal)
 390 {
 391         char *p;
 392
 393         /* Leave a valid existing V1 superblock signature alone.
 394          * Anything unrecognisable we overwrite with a new V2
 395          * signature. */
 396
 397         if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER) ||
 398             jsb->s_header.h_blocktype != htonl(JFS_SUPERBLOCK_V1)) {
 399                 jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER);
 400                 jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2);
 401         }
 402
 403         /* Zero out everything else beyond the superblock header */
 404
 405         p = ((char *) jsb) + sizeof(journal_header_t);
 406         memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t));
 407
 408         jsb->s_blocksize = htonl(ctx->fs->blocksize);
 409         jsb->s_maxlen = htonl(journal->j_maxlen);
 410         jsb->s_first = htonl(1);
 411         jsb->s_sequence = htonl(1);
 412
 413         /* In theory we should also re-zero the entire journal here.
 414          * Initialising s_sequence to a random value would be a
 415          * reasonable compromise. */
 416
 417         ll_rw_block(WRITE, 1, &journal->j_sb_buffer);
 418 }
 419
 420 static errcode_t e2fsck_journal_fix_corrupt_super(e2fsck_t ctx,
 421                                                   journal_t *journal,
 422                                                   struct problem_context *pctx)
 423 {
 424         struct ext2_super_block *sb = ctx->fs->super;
 425         int recover = ctx->fs->super->s_feature_incompat &
 426                 EXT3_FEATURE_INCOMPAT_RECOVER;
 427
 428         pctx->num = journal->j_inode->i_ino;
 429
 430         if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
 431                 if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) {
 432                         e2fsck_journal_reset_super(ctx, journal->j_superblock,
 433                                                    journal);
 434                         journal->j_transaction_sequence = 1;
 435                         e2fsck_clear_recover(ctx, recover);
 436                         return 0;
 437                 }
 438                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 439         } else if (e2fsck_journal_fix_bad_inode(ctx, pctx))
 440                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 441
 442         return 0;
 443 }
 444
 445 static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal,
 446                                    int reset, int drop)
 447 {
 448         journal_superblock_t *jsb;
 449
 450         if (drop)
 451                 mark_buffer_clean(journal->j_sb_buffer);
 452         else if (!(ctx->options & E2F_OPT_READONLY)) {
 453                 jsb = journal->j_superblock;
 454                 jsb->s_sequence = htonl(journal->j_transaction_sequence);
 455                 if (reset)
 456                         jsb->s_start = 0; /* this marks the journal as empty */
 457                 mark_buffer_dirty(journal->j_sb_buffer, 1);
 458         }
 459         brelse(journal->j_sb_buffer);
 460
 461         if (journal->j_inode)
 462                 ext2fs_free_mem((void **)&journal->j_inode);
 463         ext2fs_free_mem((void **)&journal);
 464 }
 465
 466 /*
 467  * This function makes sure that the superblock fields regarding the
 468  * journal are consistent.
 469  */
 470 int e2fsck_check_ext3_journal(e2fsck_t ctx)
 471 {
 472         struct ext2_super_block *sb = ctx->fs->super;
 473         journal_t *journal;
 474         int recover = ctx->fs->super->s_feature_incompat &
 475                 EXT3_FEATURE_INCOMPAT_RECOVER;
 476         struct problem_context pctx;
 477         int reset = 0, force_fsck = 0;
 478         int retval;
 479
 480         /* If we don't have any journal features, don't do anything more */
 481         if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
 482             !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 &&
 483             uuid_is_null(sb->s_journal_uuid))
 484                 return 0;
 485
 486         clear_problem_context(&pctx);
 487         pctx.num = sb->s_journal_inum;
 488
 489         retval = e2fsck_get_journal(ctx, &journal);
 490         if (retval) {
 491                 if (retval == EXT2_ET_BAD_INODE_NUM)
 492                         return e2fsck_journal_fix_bad_inode(ctx, &pctx);
 493                 return retval;
 494         }
 495
 496         retval = e2fsck_journal_load(journal);
 497         if (retval) {
 498                 if (retval == EXT2_ET_CORRUPT_SUPERBLOCK)
 499                         retval = e2fsck_journal_fix_corrupt_super(ctx, journal,
 500                                                                   &pctx);
 501                 e2fsck_journal_release(ctx, journal, 0, 1);
 502                 return retval;
 503         }
 504
 505         /*
 506          * We want to make the flags consistent here.  We will not leave with
 507          * needs_recovery set but has_journal clear.  We can't get in a loop
 508          * with -y, -n, or -p, only if a user isn't making up their mind.
 509          */
 510 no_has_journal:
 511         if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
 512                 recover = sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER;
 513                 pctx.str = "inode";
 514                 if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) {
 515                         if (recover &&
 516                             !fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx))
 517                                 goto no_has_journal;
 518                         /*
 519                          * Need a full fsck if we are releasing a
 520                          * journal stored on a reserved inode.
 521                          */
 522                         force_fsck = recover ||
 523                                 (sb->s_journal_inum < EXT2_FIRST_INODE(sb));
 524                         /* Clear all of the journal fields */
 525                         sb->s_journal_inum = 0;
 526                         sb->s_journal_dev = 0;
 527                         memset(sb->s_journal_uuid, 0,
 528                                sizeof(sb->s_journal_uuid));
 529                         e2fsck_clear_recover(ctx, force_fsck);
 530                 } else if (!(ctx->options & E2F_OPT_READONLY)) {
 531                         sb->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 532                         ext2fs_mark_super_dirty(ctx->fs);
 533                 }
 534         }
 535
 536         if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL &&
 537             !(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) &&
 538             journal->j_superblock->s_start != 0) {
 539                 if (fix_problem(ctx, PR_0_JOURNAL_RESET_JOURNAL, &pctx)) {
 540                         reset = 1;
 541                         sb->s_state &= ~EXT2_VALID_FS;
 542                         ext2fs_mark_super_dirty(ctx->fs);
 543                 }
 544                 /*
 545                  * If the user answers no to the above question, we
 546                  * ignore the fact that journal apparently has data;
 547                  * accidentally replaying over valid data would be far
 548                  * worse than skipping a questionable recovery.
 549                  *
 550                  * XXX should we abort with a fatal error here?  What
 551                  * will the ext3 kernel code do if a filesystem with
 552                  * !NEEDS_RECOVERY but with a non-zero
 553                  * journal->j_superblock->s_start is mounted?
 554                  */
 555         }
 556
 557         e2fsck_journal_release(ctx, journal, reset, 0);
 558         return retval;
 559 }
 560
 561 static errcode_t recover_ext3_journal(e2fsck_t ctx)
 562 {
 563         journal_t *journal;
 564         int retval;
 565
 566         retval = e2fsck_get_journal(ctx, &journal);
 567         if (retval)
 568                 return retval;
 569
 570         retval = e2fsck_journal_load(journal);
 571         if (retval)
 572                 goto errout;
 573
 574         retval = journal_init_revoke(journal, 1024);
 575         if (retval)
 576                 goto errout;
 577
 578         retval = -journal_recover(journal);
 579 errout:
 580         e2fsck_journal_release(ctx, journal, 1, 0);
 581         return retval;
 582 }
 583
 584
 585 #if 0
 586 #define TEMPLATE "/tmp/ext3.XXXXXX"
 587
 588 /*
 589  * This function attempts to mount and unmount an ext3 filesystem,
 590  * which is a cheap way to force the kernel to run the journal and
 591  * handle the recovery for us.
 592  */
 593 static errcode_t recover_ext3_journal_via_mount(e2fsck_t ctx)
 594 {
 595         ext2_filsys fs = ctx->fs;
 596         char    *dirlist[] = {"/mnt","/lost+found","/tmp","/root","/boot",0};
 597         errcode_t        retval, retval2;
 598         int      count = 0;
 599         char     template[] = TEMPLATE;
 600         struct stat buf;
 601         char    *tmpdir;
 602
 603         if (ctx->options & E2F_OPT_READONLY) {
 604                 printf("%s: won't do journal recovery while read-only\n",
 605                        ctx->device_name);
 606                 return EXT2_ET_FILE_RO;
 607         }
 608
 609         printf(_("%s: trying for ext3 kernel journal recovery\n"),
 610                ctx->device_name);
 611         /*
 612          * First try to make a temporary directory.  This may fail if
 613          * the root partition is still mounted read-only.
 614          */
 615 newtemp:
 616         tmpdir = mktemp(template);
 617         if (tmpdir) {
 618                 jfs_debug(2, "trying %s as ext3 temp mount point\n", tmpdir);
 619                 if (mkdir(template, 0700)) {
 620                         if (errno == EROFS) {
 621                                 tmpdir = NULL;
 622                                 template[0] = '\0';
 623                         } else if (errno == EEXIST && count++ < 10) {
 624                                 strcpy(template, TEMPLATE);
 625                                 goto newtemp;
 626                         }
 627                         return errno;
 628                 }
 629         }
 630
 631         /*
 632          * OK, creating a temporary directory didn't work.
 633          * Let's try a list of possible temporary mountpoints.
 634          */
 635         if (!tmpdir) {
 636                 dev_t   rootdev;
 637                 char    **cpp, *dir;
 638
 639                 if (stat("/", &buf))
 640                         return errno;
 641
 642                 rootdev = buf.st_dev;
 643
 644                 /*
 645                  * Check that dir is on the same device as root (no other
 646                  * filesystem is mounted there), and it's a directory.
 647                  */
 648                 for (cpp = dirlist; (dir = *cpp); cpp++)
 649                         if (stat(dir, &buf) == 0 && buf.st_dev == rootdev &&
 650                             S_ISDIR(buf.st_mode)) {
 651                                 tmpdir = dir;
 652                                 break;
 653                         }
 654         }
 655
 656         if (tmpdir) {
 657                 io_manager      io_ptr = fs->io->manager;
 658                 int             blocksize = fs->blocksize;
 659
 660                 jfs_debug(2, "using %s for ext3 mount\n", tmpdir);
 661                 /* FIXME - need to handle loop devices here */
 662                 if (mount(ctx->device_name, tmpdir, "ext3", MNT_FL, NULL)) {
 663                         retval = errno;
 664                         com_err(ctx->program_name, errno,
 665                                 "when mounting %s", ctx->device_name);
 666                         if (template[0])
 667                                 rmdir(tmpdir);
 668                         return retval;
 669                 }
 670                 /*
 671                  * Now that it mounted cleanly, the filesystem will have been
 672                  * recovered, so we can now unmount it.
 673                  */
 674                 if (umount(tmpdir))
 675                         return errno;
 676
 677                 /*
 678                  * Remove the temporary directory, if it was created.
 679                  */
 680                 if (template[0])
 681                         rmdir(tmpdir);
 682                 return 0;
 683         }
 684 }
 685 #endif
 686
 687 int e2fsck_run_ext3_journal(e2fsck_t ctx)
 688 {
 689         io_manager io_ptr = ctx->fs->io->manager;
 690         int blocksize = ctx->fs->blocksize;
 691         errcode_t       retval, recover_retval;
 692
 693         printf(_("%s: recovering journal\n"), ctx->device_name);
 694         if (ctx->options & E2F_OPT_READONLY) {
 695                 printf(_("%s: won't do journal recovery while read-only\n"),
 696                        ctx->device_name);
 697                 return EXT2_ET_FILE_RO;
 698         }
 699
 700         ext2fs_flush(ctx->fs);  /* Force out any modifications */
 701
 702         recover_retval = recover_ext3_journal(ctx);
 703
 704         /*
 705          * Reload the filesystem context to get up-to-date data from disk
 706          * because journal recovery will change the filesystem under us.
 707          */
 708         ext2fs_close(ctx->fs);
 709         retval = ext2fs_open(ctx->filesystem_name, EXT2_FLAG_RW,
 710                              ctx->superblock, blocksize, io_ptr,
 711                              &ctx->fs);
 712
 713         if (retval) {
 714                 com_err(ctx->program_name, retval,
 715                         _("while trying to re-open %s"),
 716                         ctx->device_name);
 717                 fatal_error(ctx, 0);
 718         }
 719         ctx->fs->priv_data = ctx;
 720
 721         /* Set the superblock flags */
 722         e2fsck_clear_recover(ctx, recover_retval);
 723         return recover_retval;
 724 }