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 #include "jfs_user.h"
  24 #include "problem.h"
  25 #include "uuid/uuid.h"
  26
  27 #ifdef JFS_DEBUG
  28 static int bh_count = 0;
  29 int journal_enable_debug = 0;
  30 #endif
  31
  32 int bmap(struct inode *inode, int block)
  33 {
  34         int retval;
  35         blk_t phys;
  36
  37         retval = ext2fs_bmap(inode->i_ctx->fs, inode->i_ino, &inode->i_ext2,
  38                              NULL, 0, block, &phys);
  39
  40         if (retval)
  41                 com_err(inode->i_ctx->device_name, retval,
  42                         _("bmap journal inode %ld, block %d\n"),
  43                         inode->i_ino, block);
  44
  45         return phys;
  46 }
  47
  48 struct buffer_head *getblk(e2fsck_t ctx, blk_t blocknr, int blocksize)
  49 {
  50         struct buffer_head *bh;
  51
  52         bh = e2fsck_allocate_memory(ctx, sizeof(*bh), "block buffer");
  53         if (!bh)
  54                 return NULL;
  55
  56         jfs_debug(4, "getblk for block %lu (%d bytes)(total %d)\n",
  57                   blocknr, blocksize, ++bh_count);
  58
  59         bh->b_ctx = ctx;
  60         bh->b_size = blocksize;
  61         bh->b_blocknr = blocknr;
  62
  63         return bh;
  64 }
  65
  66 void ll_rw_block(int rw, int nr, struct buffer_head *bhp[])
  67 {
  68         int retval;
  69         struct buffer_head *bh;
  70
  71         for (; nr > 0; --nr) {
  72                 bh = *bhp++;
  73                 if (rw == READ && !bh->b_uptodate) {
  74                         jfs_debug(3, "reading block %lu/%p\n",
  75                                   bh->b_blocknr, bh);
  76                         retval = io_channel_read_blk(bh->b_ctx->fs->io,
  77                                                      bh->b_blocknr,
  78                                                      1, bh->b_data);
  79                         if (retval) {
  80                                 com_err(bh->b_ctx->device_name, retval,
  81                                         "while reading block %ld\n",
  82                                         bh->b_blocknr);
  83                                 bh->b_err = retval;
  84                                 continue;
  85                         }
  86                         bh->b_uptodate = 1;
  87                 } else if (rw == WRITE && bh->b_dirty) {
  88                         jfs_debug(3, "writing block %lu/%p\n",
  89                                   bh->b_blocknr, bh);
  90                         retval = io_channel_write_blk(bh->b_ctx->fs->io,
  91                                                       bh->b_blocknr,
  92                                                       1, bh->b_data);
  93                         if (retval) {
  94                                 com_err(bh->b_ctx->device_name, retval,
  95                                         "while writing block %ld\n",
  96                                         bh->b_blocknr);
  97                                 bh->b_err = retval;
  98                                 continue;
  99                         }
 100                         bh->b_dirty = 0;
 101                         bh->b_uptodate = 1;
 102                 } else
 103                         jfs_debug(3, "no-op %s for block %lu\n",
 104                                   rw == READ ? "read" : "write",
 105                                   bh->b_blocknr);
 106         }
 107 }
 108
 109 void mark_buffer_dirty(struct buffer_head *bh, int dummy)
 110 {
 111         bh->b_dirty = dummy | 1; /* use dummy to avoid unused variable */
 112 }
 113
 114 void brelse(struct buffer_head *bh)
 115 {
 116         if (bh->b_dirty)
 117                 ll_rw_block(WRITE, 1, &bh);
 118         jfs_debug(3, "freeing block %lu/%p (total %d)\n",
 119                   bh->b_blocknr, bh, --bh_count);
 120         ext2fs_free_mem((void **) &bh);
 121 }
 122
 123 int buffer_uptodate(struct buffer_head *bh)
 124 {
 125         return bh->b_uptodate;
 126 }
 127
 128 void wait_on_buffer(struct buffer_head *bh)
 129 {
 130         if (!bh->b_uptodate)
 131                 ll_rw_block(READ, 1, &bh);
 132 }
 133
 134
 135 static void e2fsck_clear_recover(e2fsck_t ctx, int error)
 136 {
 137         struct ext2fs_sb *s = (struct ext2fs_sb *)ctx->fs->super;
 138
 139         s->s_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER;
 140
 141         /* if we had an error doing journal recovery, we need a full fsck */
 142         if (error)
 143                 s->s_state &= ~EXT2_VALID_FS;
 144         ext2fs_mark_super_dirty(ctx->fs);
 145 }
 146
 147 static int e2fsck_journal_init_inode(e2fsck_t ctx, struct ext2fs_sb *s,
 148                                      ino_t journal_inum, journal_t **journal)
 149 {
 150         struct inode *inode;
 151         const char *cmdname = ctx->program_name;
 152         struct buffer_head *bh;
 153         blk_t start;
 154         int retval;
 155
 156         jfs_debug(1, "Using journal inode %lu\n", journal_inum);
 157         *journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal");
 158         if (!*journal) {
 159                 return EXT2_ET_NO_MEMORY;
 160         }
 161
 162         inode = e2fsck_allocate_memory(ctx, sizeof(*inode), "journal inode");
 163         if (!inode) {
 164                 retval = EXT2_ET_NO_MEMORY;
 165                 goto exit_journal;
 166         }
 167
 168         inode->i_ctx = ctx;
 169         inode->i_ino = journal_inum;
 170         retval = ext2fs_read_inode(ctx->fs, journal_inum, &inode->i_ext2);
 171         if (retval)
 172                 goto exit_inode;
 173
 174         (*journal)->j_dev = ctx;
 175         (*journal)->j_inode = inode;
 176         (*journal)->j_blocksize = ctx->fs->blocksize;
 177         (*journal)->j_maxlen = inode->i_ext2.i_size / (*journal)->j_blocksize;
 178
 179         if (!inode->i_ext2.i_links_count ||
 180             !LINUX_S_ISREG(inode->i_ext2.i_mode) ||
 181             (*journal)->j_maxlen < JFS_MIN_JOURNAL_BLOCKS ||
 182             (start = bmap(inode, 0)) == 0) {
 183                 retval = EXT2_ET_BAD_INODE_NUM;
 184                 goto exit_inode;
 185         }
 186
 187         bh = getblk(ctx, start, (*journal)->j_blocksize);
 188         if (!bh) {
 189                 retval = EXT2_ET_NO_MEMORY;
 190                 goto exit_inode;
 191         }
 192         (*journal)->j_sb_buffer = bh;
 193         (*journal)->j_superblock = (journal_superblock_t *)bh->b_data;
 194
 195         return 0;
 196
 197 exit_inode:
 198         ext2fs_free_mem((void **)&inode);
 199 exit_journal:
 200         ext2fs_free_mem((void **)journal);
 201
 202         return retval;
 203 }
 204
 205 static int e2fsck_get_journal(e2fsck_t ctx, journal_t **journal)
 206 {
 207         char uuid_str[40];
 208         struct problem_context pctx;
 209         struct ext2fs_sb *s = (struct ext2fs_sb *)ctx->fs->super;
 210         int recover = s->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER;
 211
 212         clear_problem_context(&pctx);
 213
 214         if (s->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
 215                 if (s->s_journal_dev) {
 216                         pctx.num = s->s_journal_dev;
 217                         /* this problem aborts on -y, -p, unsupported on -n */
 218                         if (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_DEV, &pctx))
 219                                 return EXT2_ET_UNSUPP_FEATURE;
 220                         s->s_journal_dev = 0;
 221                         s->s_state &= ~EXT2_VALID_FS;
 222                         ext2fs_mark_super_dirty(ctx->fs);
 223                 }
 224                 if (!uuid_is_null(s->s_journal_uuid)) {
 225                         uuid_unparse(s->s_journal_uuid, uuid_str);
 226                         pctx.str = uuid_str;
 227                         /* this problem aborts on -y, -p, unsupported on -n */
 228                         if (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_UUID, &pctx))
 229                                 return EXT2_ET_UNSUPP_FEATURE;
 230                         uuid_clear(s->s_journal_uuid);
 231                         s->s_state &= ~EXT2_VALID_FS;
 232                         ext2fs_mark_super_dirty(ctx->fs);
 233                 }
 234                 if (!s->s_journal_inum)
 235                         return EXT2_ET_BAD_INODE_NUM;
 236         }
 237
 238         if (s->s_journal_dev) {
 239                 pctx.num = s->s_journal_dev;
 240                 if (!fix_problem(ctx, PR_0_JOURNAL_BAD_DEV, &pctx))
 241                         return EXT2_ET_UNSUPP_FEATURE;
 242                 s->s_journal_dev = 0;
 243                 s->s_state &= ~EXT2_VALID_FS;
 244                 ext2fs_mark_super_dirty(ctx->fs);
 245         }
 246         if (!uuid_is_null(s->s_journal_uuid)) {
 247                 uuid_unparse(s->s_journal_uuid, uuid_str);
 248                 pctx.str = uuid_str;
 249                 if (!fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx))
 250                         return EXT2_ET_UNSUPP_FEATURE;
 251                 uuid_clear(s->s_journal_uuid);
 252                 s->s_state &= ~EXT2_VALID_FS;
 253                 ext2fs_mark_super_dirty(ctx->fs);
 254         }
 255
 256         return e2fsck_journal_init_inode(ctx, s, s->s_journal_inum, journal);
 257 }
 258
 259 static int e2fsck_journal_fix_bad_inode(e2fsck_t ctx,
 260                                         struct problem_context *pctx)
 261 {
 262         struct ext2fs_sb *s = (struct ext2fs_sb *)ctx->fs->super;
 263         int recover = s->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER;
 264         int has_journal = s->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 265
 266         if (has_journal || s->s_journal_inum) {
 267                 /* The journal inode is bogus, remove and force full fsck */
 268                 if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) {
 269                         struct ext2fs_sb *s =(struct ext2fs_sb *)ctx->fs->super;
 270
 271                         if (has_journal && s->s_journal_inum)
 272                                 printf("*** ext3 journal has been deleted - "
 273                                        "filesystem is now ext2 only ***\n\n");
 274                         s->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 275                         s->s_journal_inum = 0;
 276                         e2fsck_clear_recover(ctx, 1);
 277                         return 0;
 278                 }
 279                 return EXT2_ET_BAD_INODE_NUM;
 280         } else if (recover) {
 281                 if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) {
 282                         e2fsck_clear_recover(ctx, 1);
 283                         return 0;
 284                 }
 285                 return EXT2_ET_UNSUPP_FEATURE;
 286         }
 287         return 0;
 288 }
 289
 290 static int e2fsck_journal_fix_unsupported_super(e2fsck_t ctx,
 291                                                 struct problem_context *pctx)
 292 {
 293         struct ext2fs_sb *s = (struct ext2fs_sb *)ctx->fs->super;
 294
 295         /* Unsupported journal superblock - first choice is abort.
 296          * Declining that gives the option to reset the superblock.
 297          *
 298          * Otherwise we get the chance to delete the journal, and
 299          * failing that we abort because we can't handle this.
 300          */
 301         if (s->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL &&
 302             fix_problem(ctx, PR_0_JOURNAL_UNSUPP_SUPER, pctx))
 303                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 304
 305         if (e2fsck_journal_fix_bad_inode(ctx, pctx))
 306                 return EXT2_ET_UNSUPP_FEATURE;
 307
 308         return 0;
 309 }
 310
 311 static int e2fsck_journal_load(journal_t *journal)
 312 {
 313         e2fsck_t ctx = journal->j_dev;
 314         journal_superblock_t *jsb;
 315         struct buffer_head *jbh = journal->j_sb_buffer;
 316         struct problem_context pctx;
 317
 318         clear_problem_context(&pctx);
 319
 320         ll_rw_block(READ, 1, &jbh);
 321         if (jbh->b_err) {
 322                 com_err(ctx->device_name, jbh->b_err,
 323                         _("reading journal superblock\n"));
 324                 return jbh->b_err;
 325         }
 326
 327         jsb = journal->j_superblock;
 328         /* If we don't even have JFS_MAGIC, we probably have a wrong inode */
 329         if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER))
 330                 return e2fsck_journal_fix_bad_inode(ctx, &pctx);
 331
 332         switch (ntohl(jsb->s_header.h_blocktype)) {
 333         case JFS_SUPERBLOCK_V1:
 334                 journal->j_format_version = 1;
 335                 break;
 336
 337         case JFS_SUPERBLOCK_V2:
 338                 journal->j_format_version = 2;
 339                 break;
 340
 341         /* If we don't understand the superblock major type, but there
 342          * is a magic number, then it is likely to be a new format we
 343          * just don't understand, so leave it alone. */
 344         default:
 345                 com_err(ctx->program_name, EXT2_ET_UNSUPP_FEATURE,
 346                         _("%s: journal has unrecognised format\n"),
 347                         ctx->device_name);
 348                 return EXT2_ET_UNSUPP_FEATURE;
 349         }
 350
 351         if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES)) {
 352                 com_err(ctx->program_name, EXT2_ET_UNSUPP_FEATURE,
 353                         _("%s: journal has incompatible features\n"),
 354                         ctx->device_name);
 355                 return EXT2_ET_UNSUPP_FEATURE;
 356         }
 357
 358         if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES)) {
 359                 com_err(ctx->program_name, EXT2_ET_UNSUPP_FEATURE,
 360                         _("%s: journal has readonly-incompatible features\n"),
 361                         ctx->device_name);
 362                 return EXT2_ET_RO_UNSUPP_FEATURE;
 363         }
 364
 365         /* We have now checked whether we know enough about the journal
 366          * format to be able to proceed safely, so any other checks that
 367          * fail we should attempt to recover from. */
 368         if (jsb->s_blocksize != htonl(journal->j_blocksize)) {
 369                 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK,
 370                         _("%s: no valid journal superblock found\n"),
 371                         ctx->device_name);
 372                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 373         }
 374
 375         if (ntohl(jsb->s_maxlen) < journal->j_maxlen)
 376                 journal->j_maxlen = ntohl(jsb->s_maxlen);
 377         else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) {
 378                 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK,
 379                         _("%s: journal too short\n"),
 380                         ctx->device_name);
 381                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 382         }
 383
 384         journal->j_tail_sequence = ntohl(jsb->s_sequence);
 385         journal->j_transaction_sequence = journal->j_tail_sequence;
 386         journal->j_tail = ntohl(jsb->s_start);
 387         journal->j_first = ntohl(jsb->s_first);
 388         journal->j_last = ntohl(jsb->s_maxlen);
 389
 390         return 0;
 391 }
 392
 393 void e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb,
 394                                 journal_t *journal)
 395 {
 396         char *p;
 397
 398         /* Leave a valid existing V1 superblock signature alone.
 399          * Anything unrecognisable we overwrite with a new V2
 400          * signature. */
 401
 402         if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER) ||
 403             jsb->s_header.h_blocktype != htonl(JFS_SUPERBLOCK_V1)) {
 404                 jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER);
 405                 jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2);
 406         }
 407
 408         /* Zero out everything else beyond the superblock header */
 409
 410         p = ((char *) jsb) + sizeof(journal_header_t);
 411         memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t));
 412
 413         jsb->s_blocksize = htonl(ctx->fs->blocksize);
 414         jsb->s_maxlen = htonl(journal->j_maxlen);
 415         jsb->s_first = htonl(1);
 416         jsb->s_sequence = htonl(1);
 417
 418         /* In theory we should also re-zero the entire journal here.
 419          * Initialising s_sequence to a random value would be a
 420          * reasonable compromise. */
 421
 422         ll_rw_block(WRITE, 1, &journal->j_sb_buffer);
 423 }
 424
 425 static int e2fsck_journal_fix_corrupt_super(e2fsck_t ctx, journal_t *journal,
 426                                             struct problem_context *pctx)
 427 {
 428         struct ext2fs_sb *s = (struct ext2fs_sb *)ctx->fs->super;
 429         int recover = s->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER;
 430
 431         pctx->num = journal->j_inode->i_ino;
 432
 433         if (s->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
 434                 if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) {
 435                         journal_superblock_t *jsb = journal->j_superblock;
 436
 437                         e2fsck_journal_reset_super(ctx, jsb, journal);
 438
 439                         journal->j_transaction_sequence = 1;
 440                         e2fsck_clear_recover(ctx, recover);
 441                         return 0;
 442                 }
 443                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 444         } else if (e2fsck_journal_fix_bad_inode(ctx, pctx))
 445                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 446
 447         return 0;
 448 }
 449
 450 static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal, int reset)
 451 {
 452         journal_superblock_t *jsb;
 453
 454         if (!(ctx->options & E2F_OPT_READONLY)) {
 455                 jsb = journal->j_superblock;
 456                 jsb->s_sequence = htonl(journal->j_transaction_sequence);
 457                 if (reset)
 458                         jsb->s_start = 0; /* this marks the journal as empty */
 459                 mark_buffer_dirty(journal->j_sb_buffer, 1);
 460         }
 461         brelse(journal->j_sb_buffer);
 462
 463         if (journal->j_inode)
 464                 free(journal->j_inode);
 465         ext2fs_free_mem((void **)&journal);
 466 }
 467
 468 int e2fsck_check_ext3_journal(e2fsck_t ctx)
 469 {
 470         struct ext2fs_sb *s = (struct ext2fs_sb *)ctx->fs->super;
 471         journal_t *journal;
 472         int recover = s->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER;
 473         struct problem_context pctx;
 474         int reset = 0;
 475         int retval;
 476
 477         /* If we don't have any journal features, don't do anything more */
 478         if (!(s->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL))
 479                 return 0;
 480
 481         clear_problem_context(&pctx);
 482         pctx.num = s->s_journal_inum;
 483
 484         retval = e2fsck_get_journal(ctx, &journal);
 485         if (retval) {
 486                 if (retval == EXT2_ET_BAD_INODE_NUM)
 487                         return e2fsck_journal_fix_bad_inode(ctx, &pctx);
 488                 return retval;
 489         }
 490
 491         retval = e2fsck_journal_load(journal);
 492         if (retval) {
 493                 if (retval == EXT2_ET_CORRUPT_SUPERBLOCK)
 494                         return e2fsck_journal_fix_corrupt_super(ctx, journal,
 495                                                                 &pctx);
 496                 return retval;
 497         }
 498
 499         /*
 500          * We want to make the flags consistent here.  We will not leave with
 501          * needs_recovery set but has_journal clear.  We can't get in a loop
 502          * with -y, -n, or -p, only if a user isn't making up their mind.
 503          */
 504 no_has_journal:
 505         if (!(s->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
 506                 recover = s->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER;
 507                 pctx.str = "inode";
 508                 if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) {
 509                         if (recover &&
 510                             !fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx))
 511                                 goto no_has_journal;
 512                         s->s_journal_inum = 0;
 513                         e2fsck_clear_recover(ctx, recover);
 514                 } else if (!(ctx->options & E2F_OPT_READONLY)) {
 515                         s->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 516                         ext2fs_mark_super_dirty(ctx->fs);
 517                 }
 518         }
 519
 520         if (s->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL &&
 521             !(s->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) &&
 522             journal->j_superblock->s_start != 0) {
 523                 if (fix_problem(ctx, PR_0_JOURNAL_RESET_JOURNAL, &pctx))
 524                         reset = 1;
 525                 /* I refuse to enable recovery for journal */
 526         }
 527
 528         e2fsck_journal_release(ctx, journal, reset);
 529         return retval;
 530 }
 531
 532 static int recover_ext3_journal(e2fsck_t ctx)
 533 {
 534         ext2_filsys fs = ctx->fs;
 535         journal_t *journal;
 536         int retval;
 537
 538         retval = e2fsck_get_journal(ctx, &journal);
 539         if (retval)
 540                 return retval;
 541
 542         retval = e2fsck_journal_load(journal);
 543         if (retval)
 544                 return retval;
 545
 546         retval = journal_init_revoke(journal, 1024);
 547         if (retval)
 548                 return retval;
 549
 550         retval = -journal_recover(journal);
 551         e2fsck_journal_release(ctx, journal, 1);
 552         return retval;
 553 }
 554
 555
 556 #if 0
 557 #define TEMPLATE "/tmp/ext3.XXXXXX"
 558
 559 /*
 560  * This function attempts to mount and unmount an ext3 filesystem,
 561  * which is a cheap way to force the kernel to run the journal and
 562  * handle the recovery for us.
 563  */
 564 static int recover_ext3_journal_via_mount(e2fsck_t ctx)
 565 {
 566         ext2_filsys fs = ctx->fs;
 567         char    *dirlist[] = {"/mnt","/lost+found","/tmp","/root","/boot",0};
 568         errcode_t        retval, retval2;
 569         int      count = 0;
 570         char     template[] = TEMPLATE;
 571         struct stat buf;
 572         char    *tmpdir;
 573
 574         if (ctx->options & E2F_OPT_READONLY) {
 575                 printf("%s: won't do journal recovery while read-only\n",
 576                        ctx->device_name);
 577                 return EXT2_ET_FILE_RO;
 578         }
 579
 580         printf(_("%s: trying for ext3 kernel journal recovery\n"),
 581                ctx->device_name);
 582         /*
 583          * First try to make a temporary directory.  This may fail if
 584          * the root partition is still mounted read-only.
 585          */
 586 newtemp:
 587         tmpdir = mktemp(template);
 588         if (tmpdir) {
 589                 jfs_debug(2, "trying %s as ext3 temp mount point\n", tmpdir);
 590                 if (mkdir(template, 0700)) {
 591                         if (errno == EROFS) {
 592                                 tmpdir = NULL;
 593                                 template[0] = '\0';
 594                         } else if (errno == EEXIST && count++ < 10) {
 595                                 strcpy(template, TEMPLATE);
 596                                 goto newtemp;
 597                         }
 598                         return errno;
 599                 }
 600         }
 601
 602         /*
 603          * OK, creating a temporary directory didn't work.
 604          * Let's try a list of possible temporary mountpoints.
 605          */
 606         if (!tmpdir) {
 607                 dev_t   rootdev;
 608                 char    **cpp, *dir;
 609
 610                 if (stat("/", &buf))
 611                         return errno;
 612
 613                 rootdev = buf.st_dev;
 614
 615                 /*
 616                  * Check that dir is on the same device as root (no other
 617                  * filesystem is mounted there), and it's a directory.
 618                  */
 619                 for (cpp = dirlist; (dir = *cpp); cpp++)
 620                         if (stat(dir, &buf) == 0 && buf.st_dev == rootdev &&
 621                             S_ISDIR(buf.st_mode)) {
 622                                 tmpdir = dir;
 623                                 break;
 624                         }
 625         }
 626
 627         if (tmpdir) {
 628                 io_manager      io_ptr = fs->io->manager;
 629                 int             blocksize = fs->blocksize;
 630
 631                 jfs_debug(2, "using %s for ext3 mount\n", tmpdir);
 632                 /* FIXME - need to handle loop devices here */
 633                 if (mount(ctx->device_name, tmpdir, "ext3", MNT_FL, NULL)) {
 634                         retval = errno;
 635                         com_err(ctx->program_name, errno,
 636                                 "when mounting %s", ctx->device_name);
 637                         if (template[0])
 638                                 rmdir(tmpdir);
 639                         return retval;
 640                 }
 641                 /*
 642                  * Now that it mounted cleanly, the filesystem will have been
 643                  * recovered, so we can now unmount it.
 644                  */
 645                 if (umount(tmpdir))
 646                         return errno;
 647
 648                 /*
 649                  * Remove the temporary directory, if it was created.
 650                  */
 651                 if (template[0])
 652                         rmdir(tmpdir);
 653                 return 0;
 654         }
 655 }
 656 #endif
 657
 658 int e2fsck_run_ext3_journal(e2fsck_t ctx)
 659 {
 660         io_manager io_ptr = ctx->fs->io->manager;
 661         int blocksize = ctx->fs->blocksize;
 662         errcode_t       retval, recover_retval;
 663
 664         printf(_("%s: recovering journal\n"), ctx->device_name);
 665         if (ctx->options & E2F_OPT_READONLY) {
 666                 printf(_("%s: won't do journal recovery while read-only\n"),
 667                        ctx->device_name);
 668                 return EXT2_ET_FILE_RO;
 669         }
 670
 671         recover_retval = recover_ext3_journal(ctx);
 672
 673         /*
 674          * Reload the filesystem context to get up-to-date data from disk
 675          * because journal recovery will change the filesystem under us.
 676          */
 677         ext2fs_close(ctx->fs);
 678         retval = ext2fs_open(ctx->filesystem_name, EXT2_FLAG_RW,
 679                              ctx->superblock, blocksize, io_ptr,
 680                              &ctx->fs);
 681
 682         if (retval) {
 683                 com_err(ctx->program_name, retval,
 684                         _("while trying to re-open %s"),
 685                         ctx->device_name);
 686                 fatal_error(ctx, 0);
 687         }
 688         ctx->fs->priv_data = ctx;
 689
 690         /* Set the superblock flags */
 691         e2fsck_clear_recover(ctx, recover_retval);
 692         return recover_retval;
 693 }