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->journal_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->journal_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                                            journal_t **journal)
 163 {
 164         struct inode *inode;
 165         struct buffer_head *bh;
 166         blk_t start;
 167         int retval;
 168
 169         jfs_debug(1, "Using journal inode %u\n", s->s_journal_inum);
 170         *journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal");
 171         if (!*journal) {
 172                 return EXT2_ET_NO_MEMORY;
 173         }
 174
 175         inode = e2fsck_allocate_memory(ctx, sizeof(*inode), "journal inode");
 176         if (!inode) {
 177                 retval = EXT2_ET_NO_MEMORY;
 178                 goto exit_journal;
 179         }
 180
 181         inode->i_ctx = ctx;
 182         inode->i_ino = s->s_journal_inum;
 183         retval = ext2fs_read_inode(ctx->fs, s->s_journal_inum, &inode->i_ext2);
 184         if (retval)
 185                 goto exit_inode;
 186
 187         (*journal)->j_dev = ctx;
 188         (*journal)->j_inode = inode;
 189         (*journal)->j_blocksize = ctx->fs->blocksize;
 190         (*journal)->j_maxlen = inode->i_ext2.i_size / (*journal)->j_blocksize;
 191         ctx->journal_io = ctx->fs->io;
 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_journal_init_dev(e2fsck_t ctx,
 220                                          struct ext2_super_block *s,
 221                                          journal_t **journal)
 222 {
 223         struct buffer_head *bh;
 224         io_manager      io_ptr;
 225         blk_t           start;
 226         int             retval;
 227         int             blocksize = ctx->fs->blocksize;
 228         struct ext2_super_block jsuper;
 229         struct problem_context pctx;
 230
 231         clear_problem_context(&pctx);
 232         if (!ctx->journal_name)
 233                 ctx->journal_name = ext2fs_find_block_device(s->s_journal_dev);
 234
 235         if (!ctx->journal_name) {
 236                 fix_problem(ctx, PR_0_CANT_FIND_JOURNAL, &pctx);
 237                 return EXT2_ET_LOAD_EXT_JOURNAL;
 238         }
 239
 240         jfs_debug(1, "Using journal file %s\n", ctx->journal_name);
 241
 242 #if 1
 243         io_ptr = unix_io_manager;
 244 #else
 245         io_ptr = test_io_manager;
 246         test_io_backing_manager = unix_io_manager;
 247 #endif
 248         if ((retval = io_ptr->open(ctx->journal_name, IO_FLAG_RW,
 249                                             &ctx->journal_io)))
 250                 return retval;
 251
 252         io_channel_set_blksize(ctx->journal_io, blocksize);
 253         start = (blocksize == 1024) ? 1 : 0;
 254         bh = getblk(ctx, start, blocksize);
 255         if (!bh)
 256                 return EXT2_ET_NO_MEMORY;
 257         ll_rw_block(READ, 1, &bh);
 258         if (bh->b_err)
 259                 return bh->b_err;
 260         memcpy(&jsuper, start ? bh->b_data :  bh->b_data + 1024,
 261                sizeof(jsuper));
 262         brelse(bh);
 263 #ifdef EXT2FS_ENABLE_SWAPFS
 264         if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
 265                 ext2fs_swap_super(&jsuper);
 266 #endif
 267         if (jsuper.s_magic != EXT2_SUPER_MAGIC ||
 268             !(jsuper.s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
 269                 fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx);
 270                 return EXT2_ET_LOAD_EXT_JOURNAL;
 271         }
 272         /* Make sure the journal UUID is correct */
 273         if (memcmp(jsuper.s_uuid, ctx->fs->super->s_journal_uuid,
 274                    sizeof(jsuper.s_uuid))) {
 275                 fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx);
 276                 return EXT2_ET_LOAD_EXT_JOURNAL;
 277         }
 278
 279         *journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal");
 280         if (!*journal) {
 281                 return EXT2_ET_NO_MEMORY;
 282         }
 283
 284         (*journal)->j_dev = ctx;
 285         (*journal)->j_inode = NULL;
 286         (*journal)->j_blocksize = ctx->fs->blocksize;
 287         (*journal)->j_maxlen = jsuper.s_blocks_count;
 288
 289         bh = getblk(ctx, start+1, (*journal)->j_blocksize);
 290         if (!bh) {
 291                 retval = EXT2_ET_NO_MEMORY;
 292                 goto errout;
 293         }
 294         (*journal)->j_sb_buffer = bh;
 295         (*journal)->j_superblock = (journal_superblock_t *)bh->b_data;
 296
 297         return 0;
 298
 299 errout:
 300         ext2fs_free_mem((void **)journal);
 301         return retval;
 302 }
 303
 304 static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **journal)
 305 {
 306         struct ext2_super_block *sb = ctx->fs->super;
 307
 308         if (uuid_is_null(sb->s_journal_uuid)) {
 309                 if (!sb->s_journal_inum)
 310                         return EXT2_ET_BAD_INODE_NUM;
 311                 return e2fsck_journal_init_inode(ctx, sb, journal);
 312         } else {
 313                 return e2fsck_journal_init_dev(ctx, sb, journal);
 314         }
 315 }
 316
 317 static errcode_t e2fsck_journal_fix_bad_inode(e2fsck_t ctx,
 318                                               struct problem_context *pctx)
 319 {
 320         struct ext2_super_block *sb = ctx->fs->super;
 321         int recover = ctx->fs->super->s_feature_incompat &
 322                 EXT3_FEATURE_INCOMPAT_RECOVER;
 323         int has_journal = ctx->fs->super->s_feature_compat &
 324                 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 325
 326         if (has_journal || sb->s_journal_inum) {
 327                 /* The journal inode is bogus, remove and force full fsck */
 328                 pctx->ino = sb->s_journal_inum;
 329                 if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) {
 330                         if (has_journal && sb->s_journal_inum)
 331                                 printf("*** ext3 journal has been deleted - "
 332                                        "filesystem is now ext2 only ***\n\n");
 333                         sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 334                         sb->s_journal_inum = 0;
 335                         ctx->flags |= E2F_FLAG_JOURNAL_INODE; /* FIXME: todo */
 336                         e2fsck_clear_recover(ctx, 1);
 337                         return 0;
 338                 }
 339                 return EXT2_ET_BAD_INODE_NUM;
 340         } else if (recover) {
 341                 if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) {
 342                         e2fsck_clear_recover(ctx, 1);
 343                         return 0;
 344                 }
 345                 return EXT2_ET_UNSUPP_FEATURE;
 346         }
 347         return 0;
 348 }
 349
 350 static errcode_t e2fsck_journal_load(journal_t *journal)
 351 {
 352         e2fsck_t ctx = journal->j_dev;
 353         journal_superblock_t *jsb;
 354         struct buffer_head *jbh = journal->j_sb_buffer;
 355         struct problem_context pctx;
 356
 357         clear_problem_context(&pctx);
 358
 359         ll_rw_block(READ, 1, &jbh);
 360         if (jbh->b_err) {
 361                 com_err(ctx->device_name, jbh->b_err,
 362                         _("reading journal superblock\n"));
 363                 return jbh->b_err;
 364         }
 365
 366         jsb = journal->j_superblock;
 367         /* If we don't even have JFS_MAGIC, we probably have a wrong inode */
 368         if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER))
 369                 return e2fsck_journal_fix_bad_inode(ctx, &pctx);
 370
 371         switch (ntohl(jsb->s_header.h_blocktype)) {
 372         case JFS_SUPERBLOCK_V1:
 373                 journal->j_format_version = 1;
 374                 break;
 375
 376         case JFS_SUPERBLOCK_V2:
 377                 journal->j_format_version = 2;
 378                 if (ntohl(jsb->s_nr_users) > 1) {
 379                         fix_problem(ctx, PR_0_JOURNAL_UNSUPP_MULTIFS, &pctx);
 380                         return EXT2_ET_JOURNAL_UNSUPP_VERSION;
 381                 }
 382                 break;
 383
 384         /*
 385          * These should never appear in a journal super block, so if
 386          * they do, the journal is badly corrupted.
 387          */
 388         case JFS_DESCRIPTOR_BLOCK:
 389         case JFS_COMMIT_BLOCK:
 390         case JFS_REVOKE_BLOCK:
 391                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 392
 393         /* If we don't understand the superblock major type, but there
 394          * is a magic number, then it is likely to be a new format we
 395          * just don't understand, so leave it alone. */
 396         default:
 397                 return EXT2_ET_JOURNAL_UNSUPP_VERSION;
 398         }
 399
 400         if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES))
 401                 return EXT2_ET_UNSUPP_FEATURE;
 402
 403         if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES))
 404                 return EXT2_ET_RO_UNSUPP_FEATURE;
 405
 406         /* We have now checked whether we know enough about the journal
 407          * format to be able to proceed safely, so any other checks that
 408          * fail we should attempt to recover from. */
 409         if (jsb->s_blocksize != htonl(journal->j_blocksize)) {
 410                 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK,
 411                         _("%s: no valid journal superblock found\n"),
 412                         ctx->device_name);
 413                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 414         }
 415
 416         if (ntohl(jsb->s_maxlen) < journal->j_maxlen)
 417                 journal->j_maxlen = ntohl(jsb->s_maxlen);
 418         else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) {
 419                 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK,
 420                         _("%s: journal too short\n"),
 421                         ctx->device_name);
 422                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 423         }
 424
 425         journal->j_tail_sequence = ntohl(jsb->s_sequence);
 426         journal->j_transaction_sequence = journal->j_tail_sequence;
 427         journal->j_tail = ntohl(jsb->s_start);
 428         journal->j_first = ntohl(jsb->s_first);
 429         journal->j_last = ntohl(jsb->s_maxlen);
 430
 431         return 0;
 432 }
 433
 434 static void e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb,
 435                                        journal_t *journal)
 436 {
 437         char *p;
 438         union {
 439                 uuid_t uuid;
 440                 __u32 val[4];
 441         } u;
 442         __u32 new_seq = 0;
 443         int i;
 444
 445         /* Leave a valid existing V1 superblock signature alone.
 446          * Anything unrecognisable we overwrite with a new V2
 447          * signature. */
 448
 449         if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER) ||
 450             jsb->s_header.h_blocktype != htonl(JFS_SUPERBLOCK_V1)) {
 451                 jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER);
 452                 jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2);
 453         }
 454
 455         /* Zero out everything else beyond the superblock header */
 456
 457         p = ((char *) jsb) + sizeof(journal_header_t);
 458         memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t));
 459
 460         jsb->s_blocksize = htonl(ctx->fs->blocksize);
 461         jsb->s_maxlen = htonl(journal->j_maxlen);
 462         jsb->s_first = htonl(1);
 463
 464         /* Initialize the journal sequence number so that there is "no"
 465          * chance we will find old "valid" transactions in the journal.
 466          * This avoids the need to zero the whole journal (slow to do,
 467          * and risky when we are just recovering the filesystem).
 468          */
 469         uuid_generate(u.uuid);
 470         for (i = 0; i < 4; i ++)
 471                 new_seq ^= u.val[i];
 472         jsb->s_sequence = htonl(new_seq);
 473
 474         mark_buffer_dirty(journal->j_sb_buffer, 1);
 475         ll_rw_block(WRITE, 1, &journal->j_sb_buffer);
 476 }
 477
 478 static errcode_t e2fsck_journal_fix_corrupt_super(e2fsck_t ctx,
 479                                                   journal_t *journal,
 480                                                   struct problem_context *pctx)
 481 {
 482         struct ext2_super_block *sb = ctx->fs->super;
 483         int recover = ctx->fs->super->s_feature_incompat &
 484                 EXT3_FEATURE_INCOMPAT_RECOVER;
 485
 486         pctx->num = journal->j_inode->i_ino;
 487
 488         if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
 489                 if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) {
 490                         e2fsck_journal_reset_super(ctx, journal->j_superblock,
 491                                                    journal);
 492                         journal->j_transaction_sequence = 1;
 493                         e2fsck_clear_recover(ctx, recover);
 494                         return 0;
 495                 }
 496                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 497         } else if (e2fsck_journal_fix_bad_inode(ctx, pctx))
 498                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 499
 500         return 0;
 501 }
 502
 503 static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal,
 504                                    int reset, int drop)
 505 {
 506         journal_superblock_t *jsb;
 507
 508         if (drop)
 509                 mark_buffer_clean(journal->j_sb_buffer);
 510         else if (!(ctx->options & E2F_OPT_READONLY)) {
 511                 jsb = journal->j_superblock;
 512                 jsb->s_sequence = htonl(journal->j_transaction_sequence);
 513                 if (reset)
 514                         jsb->s_start = 0; /* this marks the journal as empty */
 515                 mark_buffer_dirty(journal->j_sb_buffer, 1);
 516         }
 517         brelse(journal->j_sb_buffer);
 518
 519         if (journal->j_inode)
 520                 ext2fs_free_mem((void **)&journal->j_inode);
 521         ext2fs_free_mem((void **)&journal);
 522 }
 523
 524 /*
 525  * This function makes sure that the superblock fields regarding the
 526  * journal are consistent.
 527  */
 528 int e2fsck_check_ext3_journal(e2fsck_t ctx)
 529 {
 530         struct ext2_super_block *sb = ctx->fs->super;
 531         journal_t *journal;
 532         int recover = ctx->fs->super->s_feature_incompat &
 533                 EXT3_FEATURE_INCOMPAT_RECOVER;
 534         struct problem_context pctx;
 535         int reset = 0, force_fsck = 0;
 536         int retval;
 537
 538         /* If we don't have any journal features, don't do anything more */
 539         if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
 540             !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 &&
 541             uuid_is_null(sb->s_journal_uuid))
 542                 return 0;
 543
 544         clear_problem_context(&pctx);
 545         pctx.num = sb->s_journal_inum;
 546
 547         retval = e2fsck_get_journal(ctx, &journal);
 548         if (retval) {
 549                 if (retval == EXT2_ET_BAD_INODE_NUM)
 550                         return e2fsck_journal_fix_bad_inode(ctx, &pctx);
 551                 return retval;
 552         }
 553
 554         retval = e2fsck_journal_load(journal);
 555         if (retval) {
 556                 if ((retval == EXT2_ET_CORRUPT_SUPERBLOCK) ||
 557                     ((retval == EXT2_ET_UNSUPP_FEATURE) &&
 558                     (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_INCOMPAT,
 559                                   &pctx))) ||
 560                     ((retval == EXT2_ET_RO_UNSUPP_FEATURE) &&
 561                     (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_ROCOMPAT,
 562                                   &pctx))) ||
 563                     ((retval == EXT2_ET_JOURNAL_UNSUPP_VERSION) &&
 564                     (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_VERSION, &pctx))))
 565                         retval = e2fsck_journal_fix_corrupt_super(ctx, journal,
 566                                                                   &pctx);
 567                 e2fsck_journal_release(ctx, journal, 0, 1);
 568                 return retval;
 569         }
 570
 571         /*
 572          * We want to make the flags consistent here.  We will not leave with
 573          * needs_recovery set but has_journal clear.  We can't get in a loop
 574          * with -y, -n, or -p, only if a user isn't making up their mind.
 575          */
 576 no_has_journal:
 577         if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
 578                 recover = sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER;
 579                 pctx.str = "inode";
 580                 if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) {
 581                         if (recover &&
 582                             !fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx))
 583                                 goto no_has_journal;
 584                         /*
 585                          * Need a full fsck if we are releasing a
 586                          * journal stored on a reserved inode.
 587                          */
 588                         force_fsck = recover ||
 589                                 (sb->s_journal_inum < EXT2_FIRST_INODE(sb));
 590                         /* Clear all of the journal fields */
 591                         sb->s_journal_inum = 0;
 592                         sb->s_journal_dev = 0;
 593                         memset(sb->s_journal_uuid, 0,
 594                                sizeof(sb->s_journal_uuid));
 595                         e2fsck_clear_recover(ctx, force_fsck);
 596                 } else if (!(ctx->options & E2F_OPT_READONLY)) {
 597                         sb->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 598                         ext2fs_mark_super_dirty(ctx->fs);
 599                 }
 600         }
 601
 602         if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL &&
 603             !(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) &&
 604             journal->j_superblock->s_start != 0) {
 605                 if (fix_problem(ctx, PR_0_JOURNAL_RESET_JOURNAL, &pctx)) {
 606                         reset = 1;
 607                         sb->s_state &= ~EXT2_VALID_FS;
 608                         ext2fs_mark_super_dirty(ctx->fs);
 609                 }
 610                 /*
 611                  * If the user answers no to the above question, we
 612                  * ignore the fact that journal apparently has data;
 613                  * accidentally replaying over valid data would be far
 614                  * worse than skipping a questionable recovery.
 615                  *
 616                  * XXX should we abort with a fatal error here?  What
 617                  * will the ext3 kernel code do if a filesystem with
 618                  * !NEEDS_RECOVERY but with a non-zero
 619                  * journal->j_superblock->s_start is mounted?
 620                  */
 621         }
 622
 623         e2fsck_journal_release(ctx, journal, reset, 0);
 624         return retval;
 625 }
 626
 627 static errcode_t recover_ext3_journal(e2fsck_t ctx)
 628 {
 629         journal_t *journal;
 630         int retval;
 631
 632         retval = e2fsck_get_journal(ctx, &journal);
 633         if (retval)
 634                 return retval;
 635
 636         retval = e2fsck_journal_load(journal);
 637         if (retval)
 638                 goto errout;
 639
 640         retval = journal_init_revoke(journal, 1024);
 641         if (retval)
 642                 goto errout;
 643
 644         retval = -journal_recover(journal);
 645 errout:
 646         e2fsck_journal_release(ctx, journal, 1, 0);
 647         return retval;
 648 }
 649
 650 int e2fsck_run_ext3_journal(e2fsck_t ctx)
 651 {
 652         io_manager io_ptr = ctx->fs->io->manager;
 653         int blocksize = ctx->fs->blocksize;
 654         errcode_t       retval, recover_retval;
 655
 656         printf(_("%s: recovering journal\n"), ctx->device_name);
 657         if (ctx->options & E2F_OPT_READONLY) {
 658                 printf(_("%s: won't do journal recovery while read-only\n"),
 659                        ctx->device_name);
 660                 return EXT2_ET_FILE_RO;
 661         }
 662
 663         if (ctx->fs->flags & EXT2_FLAG_DIRTY)
 664                 ext2fs_flush(ctx->fs);  /* Force out any modifications */
 665
 666         recover_retval = recover_ext3_journal(ctx);
 667
 668         /*
 669          * Reload the filesystem context to get up-to-date data from disk
 670          * because journal recovery will change the filesystem under us.
 671          */
 672         ext2fs_close(ctx->fs);
 673         retval = ext2fs_open(ctx->filesystem_name, EXT2_FLAG_RW,
 674                              ctx->superblock, blocksize, io_ptr,
 675                              &ctx->fs);
 676
 677         if (retval) {
 678                 com_err(ctx->program_name, retval,
 679                         _("while trying to re-open %s"),
 680                         ctx->device_name);
 681                 fatal_error(ctx, 0);
 682         }
 683         ctx->fs->priv_data = ctx;
 684
 685         /* Set the superblock flags */
 686         e2fsck_clear_recover(ctx, recover_retval);
 687         return recover_retval;
 688 }