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 #include "config.h"
  16 #ifdef HAVE_SYS_MOUNT_H
  17 #include <sys/param.h>
  18 #include <sys/mount.h>
  19 #define MNT_FL (MS_MGC_VAL | MS_RDONLY)
  20 #endif
  21 #ifdef HAVE_SYS_STAT_H
  22 #include <sys/stat.h>
  23 #endif
  24
  25 #define E2FSCK_INCLUDE_INLINE_FUNCS
  26 #include "jfs_user.h"
  27 #include "problem.h"
  28 #include "uuid/uuid.h"
  29
  30 #ifdef CONFIG_JBD_DEBUG         /* Enabled by configure --enable-jfs-debug */
  31 static int bh_count = 0;
  32 #endif
  33
  34 /*
  35  * Define USE_INODE_IO to use the inode_io.c / fileio.c codepaths.
  36  * This creates a larger static binary, and a smaller binary using
  37  * shared libraries.  It's also probably slightly less CPU-efficient,
  38  * which is why it's not on by default.  But, it's a good way of
  39  * testing the functions in inode_io.c and fileio.c.
  40  */
  41 #undef USE_INODE_IO
  42
  43 /* Checksumming functions */
  44 static int e2fsck_journal_verify_csum_type(journal_t *j,
  45                                            journal_superblock_t *jsb)
  46 {
  47         if (!jbd2_journal_has_csum_v2or3(j))
  48                 return 1;
  49
  50         return jsb->s_checksum_type == JBD2_CRC32C_CHKSUM;
  51 }
  52
  53 static __u32 e2fsck_journal_sb_csum(journal_superblock_t *jsb)
  54 {
  55         __u32 crc, old_crc;
  56
  57         old_crc = jsb->s_checksum;
  58         jsb->s_checksum = 0;
  59         crc = ext2fs_crc32c_le(~0, (unsigned char *)jsb,
  60                                sizeof(journal_superblock_t));
  61         jsb->s_checksum = old_crc;
  62
  63         return crc;
  64 }
  65
  66 static int e2fsck_journal_sb_csum_verify(journal_t *j,
  67                                          journal_superblock_t *jsb)
  68 {
  69         __u32 provided, calculated;
  70
  71         if (!jbd2_journal_has_csum_v2or3(j))
  72                 return 1;
  73
  74         provided = ext2fs_be32_to_cpu(jsb->s_checksum);
  75         calculated = e2fsck_journal_sb_csum(jsb);
  76
  77         return provided == calculated;
  78 }
  79
  80 static errcode_t e2fsck_journal_sb_csum_set(journal_t *j,
  81                                             journal_superblock_t *jsb)
  82 {
  83         __u32 crc;
  84
  85         if (!jbd2_journal_has_csum_v2or3(j))
  86                 return 0;
  87
  88         crc = e2fsck_journal_sb_csum(jsb);
  89         jsb->s_checksum = ext2fs_cpu_to_be32(crc);
  90         return 0;
  91 }
  92
  93 /* Kernel compatibility functions for handling the journal.  These allow us
  94  * to use the recovery.c file virtually unchanged from the kernel, so we
  95  * don't have to do much to keep kernel and user recovery in sync.
  96  */
  97 int jbd2_journal_bmap(journal_t *journal, blk64_t block,
  98                       unsigned long long *phys)
  99 {
 100 #ifdef USE_INODE_IO
 101         *phys = block;
 102         return 0;
 103 #else
 104         struct inode    *inode = journal->j_inode;
 105         errcode_t       retval;
 106         blk64_t         pblk;
 107
 108         if (!inode) {
 109                 *phys = block;
 110                 return 0;
 111         }
 112
 113         retval= ext2fs_bmap2(inode->i_ctx->fs, inode->i_ino,
 114                              &inode->i_ext2, NULL, 0, block, 0, &pblk);
 115         *phys = pblk;
 116         return -1 * ((int) retval);
 117 #endif
 118 }
 119
 120 struct buffer_head *getblk(kdev_t kdev, blk64_t blocknr, int blocksize)
 121 {
 122         struct buffer_head *bh;
 123         int bufsize = sizeof(*bh) + kdev->k_ctx->fs->blocksize -
 124                 sizeof(bh->b_data);
 125
 126         bh = e2fsck_allocate_memory(kdev->k_ctx, bufsize, "block buffer");
 127         if (!bh)
 128                 return NULL;
 129
 130 #ifdef CONFIG_JBD_DEBUG
 131         if (journal_enable_debug >= 3)
 132                 bh_count++;
 133 #endif
 134         jfs_debug(4, "getblk for block %llu (%d bytes)(total %d)\n",
 135                   (unsigned long long) blocknr, blocksize, bh_count);
 136
 137         bh->b_ctx = kdev->k_ctx;
 138         if (kdev->k_dev == K_DEV_FS)
 139                 bh->b_io = kdev->k_ctx->fs->io;
 140         else
 141                 bh->b_io = kdev->k_ctx->journal_io;
 142         bh->b_size = blocksize;
 143         bh->b_blocknr = blocknr;
 144
 145         return bh;
 146 }
 147
 148 int sync_blockdev(kdev_t kdev)
 149 {
 150         io_channel      io;
 151
 152         if (kdev->k_dev == K_DEV_FS)
 153                 io = kdev->k_ctx->fs->io;
 154         else
 155                 io = kdev->k_ctx->journal_io;
 156
 157         return io_channel_flush(io) ? -EIO : 0;
 158 }
 159
 160 void ll_rw_block(int rw, int op_flags, int nr, struct buffer_head *bhp[])
 161 {
 162         errcode_t retval;
 163         struct buffer_head *bh;
 164
 165         for (; nr > 0; --nr) {
 166                 bh = *bhp++;
 167                 if (rw == REQ_OP_READ && !bh->b_uptodate) {
 168                         jfs_debug(3, "reading block %llu/%p\n",
 169                                   bh->b_blocknr, (void *) bh);
 170                         retval = io_channel_read_blk64(bh->b_io,
 171                                                      bh->b_blocknr,
 172                                                      1, bh->b_data);
 173                         if (retval) {
 174                                 com_err(bh->b_ctx->device_name, retval,
 175                                         "while reading block %llu\n",
 176                                         bh->b_blocknr);
 177                                 bh->b_err = (int) retval;
 178                                 continue;
 179                         }
 180                         bh->b_uptodate = 1;
 181                 } else if (rw == REQ_OP_WRITE && bh->b_dirty) {
 182                         jfs_debug(3, "writing block %llu/%p\n",
 183                                   bh->b_blocknr,
 184                                   (void *) bh);
 185                         retval = io_channel_write_blk64(bh->b_io,
 186                                                       bh->b_blocknr,
 187                                                       1, bh->b_data);
 188                         if (retval) {
 189                                 com_err(bh->b_ctx->device_name, retval,
 190                                         "while writing block %llu\n",
 191                                         bh->b_blocknr);
 192                                 bh->b_err = (int) retval;
 193                                 continue;
 194                         }
 195                         bh->b_dirty = 0;
 196                         bh->b_uptodate = 1;
 197                 } else {
 198                         jfs_debug(3, "no-op %s for block %llu\n",
 199                                   rw == REQ_OP_READ ? "read" : "write",
 200                                   bh->b_blocknr);
 201                 }
 202         }
 203 }
 204
 205 void mark_buffer_dirty(struct buffer_head *bh)
 206 {
 207         bh->b_dirty = 1;
 208 }
 209
 210 static void mark_buffer_clean(struct buffer_head * bh)
 211 {
 212         bh->b_dirty = 0;
 213 }
 214
 215 void brelse(struct buffer_head *bh)
 216 {
 217         if (bh->b_dirty)
 218                 ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
 219         jfs_debug(3, "freeing block %llu/%p (total %d)\n",
 220                   bh->b_blocknr, (void *) bh, --bh_count);
 221         ext2fs_free_mem(&bh);
 222 }
 223
 224 int buffer_uptodate(struct buffer_head *bh)
 225 {
 226         return bh->b_uptodate;
 227 }
 228
 229 void mark_buffer_uptodate(struct buffer_head *bh, int val)
 230 {
 231         bh->b_uptodate = val;
 232 }
 233
 234 void wait_on_buffer(struct buffer_head *bh)
 235 {
 236         if (!bh->b_uptodate)
 237                 ll_rw_block(REQ_OP_READ, 0, 1, &bh);
 238 }
 239
 240
 241 static void e2fsck_clear_recover(e2fsck_t ctx, int error)
 242 {
 243         ext2fs_clear_feature_journal_needs_recovery(ctx->fs->super);
 244
 245         /* if we had an error doing journal recovery, we need a full fsck */
 246         if (error)
 247                 ctx->fs->super->s_state &= ~EXT2_VALID_FS;
 248         ext2fs_mark_super_dirty(ctx->fs);
 249 }
 250
 251 /*
 252  * This is a helper function to check the validity of the journal.
 253  */
 254 struct process_block_struct {
 255         e2_blkcnt_t     last_block;
 256 };
 257
 258 static int process_journal_block(ext2_filsys fs,
 259                                  blk64_t        *block_nr,
 260                                  e2_blkcnt_t blockcnt,
 261                                  blk64_t ref_block EXT2FS_ATTR((unused)),
 262                                  int ref_offset EXT2FS_ATTR((unused)),
 263                                  void *priv_data)
 264 {
 265         struct process_block_struct *p;
 266         blk64_t blk = *block_nr;
 267
 268         p = (struct process_block_struct *) priv_data;
 269
 270         if (!blk || blk < fs->super->s_first_data_block ||
 271             blk >= ext2fs_blocks_count(fs->super))
 272                 return BLOCK_ABORT;
 273
 274         if (blockcnt >= 0)
 275                 p->last_block = blockcnt;
 276         return 0;
 277 }
 278
 279 static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal)
 280 {
 281         struct process_block_struct pb;
 282         struct ext2_super_block *sb = ctx->fs->super;
 283         struct ext2_super_block jsuper;
 284         struct problem_context  pctx;
 285         struct buffer_head      *bh;
 286         struct inode            *j_inode = NULL;
 287         struct kdev_s           *dev_fs = NULL, *dev_journal;
 288         const char              *journal_name = 0;
 289         journal_t               *journal = NULL;
 290         errcode_t               retval = 0;
 291         io_manager              io_ptr = 0;
 292         unsigned long long      start = 0;
 293         int                     ret;
 294         int                     ext_journal = 0;
 295         int                     tried_backup_jnl = 0;
 296
 297         clear_problem_context(&pctx);
 298
 299         journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal");
 300         if (!journal) {
 301                 return EXT2_ET_NO_MEMORY;
 302         }
 303
 304         dev_fs = e2fsck_allocate_memory(ctx, 2*sizeof(struct kdev_s), "kdev");
 305         if (!dev_fs) {
 306                 retval = EXT2_ET_NO_MEMORY;
 307                 goto errout;
 308         }
 309         dev_journal = dev_fs+1;
 310
 311         dev_fs->k_ctx = dev_journal->k_ctx = ctx;
 312         dev_fs->k_dev = K_DEV_FS;
 313         dev_journal->k_dev = K_DEV_JOURNAL;
 314
 315         journal->j_dev = dev_journal;
 316         journal->j_fs_dev = dev_fs;
 317         journal->j_inode = NULL;
 318         journal->j_blocksize = ctx->fs->blocksize;
 319
 320         if (uuid_is_null(sb->s_journal_uuid)) {
 321                 if (!sb->s_journal_inum) {
 322                         retval = EXT2_ET_BAD_INODE_NUM;
 323                         goto errout;
 324                 }
 325                 j_inode = e2fsck_allocate_memory(ctx, sizeof(*j_inode),
 326                                                  "journal inode");
 327                 if (!j_inode) {
 328                         retval = EXT2_ET_NO_MEMORY;
 329                         goto errout;
 330                 }
 331
 332                 j_inode->i_ctx = ctx;
 333                 j_inode->i_ino = sb->s_journal_inum;
 334
 335                 if ((retval = ext2fs_read_inode(ctx->fs,
 336                                                 sb->s_journal_inum,
 337                                                 &j_inode->i_ext2))) {
 338                 try_backup_journal:
 339                         if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS ||
 340                             tried_backup_jnl)
 341                                 goto errout;
 342                         memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode));
 343                         memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks,
 344                                EXT2_N_BLOCKS*4);
 345                         j_inode->i_ext2.i_size_high = sb->s_jnl_blocks[15];
 346                         j_inode->i_ext2.i_size = sb->s_jnl_blocks[16];
 347                         j_inode->i_ext2.i_links_count = 1;
 348                         j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600;
 349                         e2fsck_use_inode_shortcuts(ctx, 1);
 350                         ctx->stashed_ino = j_inode->i_ino;
 351                         ctx->stashed_inode = &j_inode->i_ext2;
 352                         tried_backup_jnl++;
 353                 }
 354                 if (!j_inode->i_ext2.i_links_count ||
 355                     !LINUX_S_ISREG(j_inode->i_ext2.i_mode)) {
 356                         retval = EXT2_ET_NO_JOURNAL;
 357                         goto try_backup_journal;
 358                 }
 359                 if (EXT2_I_SIZE(&j_inode->i_ext2) / journal->j_blocksize <
 360                     JBD2_MIN_JOURNAL_BLOCKS) {
 361                         retval = EXT2_ET_JOURNAL_TOO_SMALL;
 362                         goto try_backup_journal;
 363                 }
 364                 pb.last_block = -1;
 365                 retval = ext2fs_block_iterate3(ctx->fs, j_inode->i_ino,
 366                                                BLOCK_FLAG_HOLE, 0,
 367                                                process_journal_block, &pb);
 368                 if ((pb.last_block + 1) * ctx->fs->blocksize <
 369                     (int) EXT2_I_SIZE(&j_inode->i_ext2)) {
 370                         retval = EXT2_ET_JOURNAL_TOO_SMALL;
 371                         goto try_backup_journal;
 372                 }
 373                 if (tried_backup_jnl && !(ctx->options & E2F_OPT_READONLY)) {
 374                         retval = ext2fs_write_inode(ctx->fs, sb->s_journal_inum,
 375                                                     &j_inode->i_ext2);
 376                         if (retval)
 377                                 goto errout;
 378                 }
 379
 380                 journal->j_maxlen = EXT2_I_SIZE(&j_inode->i_ext2) /
 381                         journal->j_blocksize;
 382
 383 #ifdef USE_INODE_IO
 384                 retval = ext2fs_inode_io_intern2(ctx->fs, sb->s_journal_inum,
 385                                                  &j_inode->i_ext2,
 386                                                  &journal_name);
 387                 if (retval)
 388                         goto errout;
 389
 390                 io_ptr = inode_io_manager;
 391 #else
 392                 journal->j_inode = j_inode;
 393                 ctx->journal_io = ctx->fs->io;
 394                 if ((ret = jbd2_journal_bmap(journal, 0, &start)) != 0) {
 395                         retval = (errcode_t) (-1 * ret);
 396                         goto errout;
 397                 }
 398 #endif
 399         } else {
 400                 ext_journal = 1;
 401                 if (!ctx->journal_name) {
 402                         char uuid[37];
 403
 404                         uuid_unparse(sb->s_journal_uuid, uuid);
 405                         ctx->journal_name = blkid_get_devname(ctx->blkid,
 406                                                               "UUID", uuid);
 407                         if (!ctx->journal_name)
 408                                 ctx->journal_name = blkid_devno_to_devname(sb->s_journal_dev);
 409                 }
 410                 journal_name = ctx->journal_name;
 411
 412                 if (!journal_name) {
 413                         fix_problem(ctx, PR_0_CANT_FIND_JOURNAL, &pctx);
 414                         retval = EXT2_ET_LOAD_EXT_JOURNAL;
 415                         goto errout;
 416                 }
 417
 418                 jfs_debug(1, "Using journal file %s\n", journal_name);
 419                 io_ptr = unix_io_manager;
 420         }
 421
 422 #if 0
 423         test_io_backing_manager = io_ptr;
 424         io_ptr = test_io_manager;
 425 #endif
 426 #ifndef USE_INODE_IO
 427         if (ext_journal)
 428 #endif
 429         {
 430                 int flags = IO_FLAG_RW;
 431                 if (!(ctx->mount_flags & EXT2_MF_ISROOT &&
 432                       ctx->mount_flags & EXT2_MF_READONLY))
 433                         flags |= IO_FLAG_EXCLUSIVE;
 434                 if ((ctx->mount_flags & EXT2_MF_READONLY) &&
 435                     (ctx->options & E2F_OPT_FORCE))
 436                         flags &= ~IO_FLAG_EXCLUSIVE;
 437
 438
 439                 retval = io_ptr->open(journal_name, flags,
 440                                       &ctx->journal_io);
 441         }
 442         if (retval)
 443                 goto errout;
 444
 445         io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize);
 446
 447         if (ext_journal) {
 448                 blk64_t maxlen;
 449
 450                 start = ext2fs_journal_sb_start(ctx->fs->blocksize) - 1;
 451                 bh = getblk(dev_journal, start, ctx->fs->blocksize);
 452                 if (!bh) {
 453                         retval = EXT2_ET_NO_MEMORY;
 454                         goto errout;
 455                 }
 456                 ll_rw_block(REQ_OP_READ, 0, 1, &bh);
 457                 if ((retval = bh->b_err) != 0) {
 458                         brelse(bh);
 459                         goto errout;
 460                 }
 461                 memcpy(&jsuper, start ? bh->b_data :  bh->b_data + SUPERBLOCK_OFFSET,
 462                        sizeof(jsuper));
 463 #ifdef WORDS_BIGENDIAN
 464                 if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
 465                         ext2fs_swap_super(&jsuper);
 466 #endif
 467                 if (jsuper.s_magic != EXT2_SUPER_MAGIC ||
 468                     !ext2fs_has_feature_journal_dev(&jsuper)) {
 469                         fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx);
 470                         retval = EXT2_ET_LOAD_EXT_JOURNAL;
 471                         brelse(bh);
 472                         goto errout;
 473                 }
 474                 /* Make sure the journal UUID is correct */
 475                 if (memcmp(jsuper.s_uuid, ctx->fs->super->s_journal_uuid,
 476                            sizeof(jsuper.s_uuid))) {
 477                         fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx);
 478                         retval = EXT2_ET_LOAD_EXT_JOURNAL;
 479                         brelse(bh);
 480                         goto errout;
 481                 }
 482
 483                 /* Check the superblock checksum */
 484                 if (ext2fs_has_feature_metadata_csum(&jsuper)) {
 485                         struct struct_ext2_filsys fsx;
 486                         struct ext2_super_block superx;
 487                         void *p;
 488
 489                         p = start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET;
 490                         memcpy(&fsx, ctx->fs, sizeof(fsx));
 491                         memcpy(&superx, ctx->fs->super, sizeof(superx));
 492                         fsx.super = &superx;
 493                         ext2fs_set_feature_metadata_csum(fsx.super);
 494                         if (!ext2fs_superblock_csum_verify(&fsx, p) &&
 495                             fix_problem(ctx, PR_0_EXT_JOURNAL_SUPER_CSUM_INVALID,
 496                                         &pctx)) {
 497                                 ext2fs_superblock_csum_set(&fsx, p);
 498                                 mark_buffer_dirty(bh);
 499                         }
 500                 }
 501                 brelse(bh);
 502
 503                 maxlen = ext2fs_blocks_count(&jsuper);
 504                 journal->j_maxlen = (maxlen < 1ULL << 32) ? maxlen : (1ULL << 32) - 1;
 505                 start++;
 506         }
 507
 508         if (!(bh = getblk(dev_journal, start, journal->j_blocksize))) {
 509                 retval = EXT2_ET_NO_MEMORY;
 510                 goto errout;
 511         }
 512
 513         journal->j_sb_buffer = bh;
 514         journal->j_superblock = (journal_superblock_t *)bh->b_data;
 515
 516 #ifdef USE_INODE_IO
 517         if (j_inode)
 518                 ext2fs_free_mem(&j_inode);
 519 #endif
 520
 521         *ret_journal = journal;
 522         e2fsck_use_inode_shortcuts(ctx, 0);
 523         return 0;
 524
 525 errout:
 526         e2fsck_use_inode_shortcuts(ctx, 0);
 527         if (dev_fs)
 528                 ext2fs_free_mem(&dev_fs);
 529         if (j_inode)
 530                 ext2fs_free_mem(&j_inode);
 531         if (journal)
 532                 ext2fs_free_mem(&journal);
 533         return retval;
 534 }
 535
 536 static errcode_t e2fsck_journal_fix_bad_inode(e2fsck_t ctx,
 537                                               struct problem_context *pctx)
 538 {
 539         struct ext2_super_block *sb = ctx->fs->super;
 540         int recover = ext2fs_has_feature_journal_needs_recovery(ctx->fs->super);
 541         int has_journal = ext2fs_has_feature_journal(ctx->fs->super);
 542
 543         if (has_journal || sb->s_journal_inum) {
 544                 /* The journal inode is bogus, remove and force full fsck */
 545                 pctx->ino = sb->s_journal_inum;
 546                 if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) {
 547                         if (has_journal && sb->s_journal_inum)
 548                                 printf("*** journal has been deleted ***\n\n");
 549                         ext2fs_clear_feature_journal(sb);
 550                         sb->s_journal_inum = 0;
 551                         memset(sb->s_jnl_blocks, 0, sizeof(sb->s_jnl_blocks));
 552                         ctx->flags |= E2F_FLAG_JOURNAL_INODE;
 553                         ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 554                         e2fsck_clear_recover(ctx, 1);
 555                         return 0;
 556                 }
 557                 return EXT2_ET_CORRUPT_JOURNAL_SB;
 558         } else if (recover) {
 559                 if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) {
 560                         e2fsck_clear_recover(ctx, 1);
 561                         return 0;
 562                 }
 563                 return EXT2_ET_UNSUPP_FEATURE;
 564         }
 565         return 0;
 566 }
 567
 568 #define V1_SB_SIZE      0x0024
 569 static void clear_v2_journal_fields(journal_t *journal)
 570 {
 571         e2fsck_t ctx = journal->j_dev->k_ctx;
 572         struct problem_context pctx;
 573
 574         clear_problem_context(&pctx);
 575
 576         if (!fix_problem(ctx, PR_0_CLEAR_V2_JOURNAL, &pctx))
 577                 return;
 578
 579         ctx->flags |= E2F_FLAG_PROBLEMS_FIXED;
 580         memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0,
 581                ctx->fs->blocksize-V1_SB_SIZE);
 582         mark_buffer_dirty(journal->j_sb_buffer);
 583 }
 584
 585
 586 static errcode_t e2fsck_journal_load(journal_t *journal)
 587 {
 588         e2fsck_t ctx = journal->j_dev->k_ctx;
 589         journal_superblock_t *jsb;
 590         struct buffer_head *jbh = journal->j_sb_buffer;
 591         struct problem_context pctx;
 592
 593         clear_problem_context(&pctx);
 594
 595         ll_rw_block(REQ_OP_READ, 0, 1, &jbh);
 596         if (jbh->b_err) {
 597                 com_err(ctx->device_name, jbh->b_err, "%s",
 598                         _("reading journal superblock\n"));
 599                 return jbh->b_err;
 600         }
 601
 602         jsb = journal->j_superblock;
 603         /* If we don't even have JBD2_MAGIC, we probably have a wrong inode */
 604         if (jsb->s_header.h_magic != htonl(JBD2_MAGIC_NUMBER))
 605                 return e2fsck_journal_fix_bad_inode(ctx, &pctx);
 606
 607         switch (ntohl(jsb->s_header.h_blocktype)) {
 608         case JBD2_SUPERBLOCK_V1:
 609                 journal->j_format_version = 1;
 610                 if (jsb->s_feature_compat ||
 611                     jsb->s_feature_incompat ||
 612                     jsb->s_feature_ro_compat ||
 613                     jsb->s_nr_users)
 614                         clear_v2_journal_fields(journal);
 615                 break;
 616
 617         case JBD2_SUPERBLOCK_V2:
 618                 journal->j_format_version = 2;
 619                 if (ntohl(jsb->s_nr_users) > 1 &&
 620                     uuid_is_null(ctx->fs->super->s_journal_uuid))
 621                         clear_v2_journal_fields(journal);
 622                 if (ntohl(jsb->s_nr_users) > 1) {
 623                         fix_problem(ctx, PR_0_JOURNAL_UNSUPP_MULTIFS, &pctx);
 624                         return EXT2_ET_JOURNAL_UNSUPP_VERSION;
 625                 }
 626                 break;
 627
 628         /*
 629          * These should never appear in a journal super block, so if
 630          * they do, the journal is badly corrupted.
 631          */
 632         case JBD2_DESCRIPTOR_BLOCK:
 633         case JBD2_COMMIT_BLOCK:
 634         case JBD2_REVOKE_BLOCK:
 635                 return EXT2_ET_CORRUPT_JOURNAL_SB;
 636
 637         /* If we don't understand the superblock major type, but there
 638          * is a magic number, then it is likely to be a new format we
 639          * just don't understand, so leave it alone. */
 640         default:
 641                 return EXT2_ET_JOURNAL_UNSUPP_VERSION;
 642         }
 643
 644         if (JBD2_HAS_INCOMPAT_FEATURE(journal, ~JBD2_KNOWN_INCOMPAT_FEATURES))
 645                 return EXT2_ET_UNSUPP_FEATURE;
 646
 647         if (JBD2_HAS_RO_COMPAT_FEATURE(journal, ~JBD2_KNOWN_ROCOMPAT_FEATURES))
 648                 return EXT2_ET_RO_UNSUPP_FEATURE;
 649
 650         /* Checksum v1-3 are mutually exclusive features. */
 651         if (jbd2_has_feature_csum2(journal) && jbd2_has_feature_csum3(journal))
 652                 return EXT2_ET_CORRUPT_JOURNAL_SB;
 653
 654         if (jbd2_journal_has_csum_v2or3(journal) &&
 655             jbd2_has_feature_checksum(journal))
 656                 return EXT2_ET_CORRUPT_JOURNAL_SB;
 657
 658         if (!e2fsck_journal_verify_csum_type(journal, jsb) ||
 659             !e2fsck_journal_sb_csum_verify(journal, jsb))
 660                 return EXT2_ET_CORRUPT_JOURNAL_SB;
 661
 662         if (jbd2_journal_has_csum_v2or3(journal))
 663                 journal->j_csum_seed = jbd2_chksum(journal, ~0, jsb->s_uuid,
 664                                                    sizeof(jsb->s_uuid));
 665
 666         /* We have now checked whether we know enough about the journal
 667          * format to be able to proceed safely, so any other checks that
 668          * fail we should attempt to recover from. */
 669         if (jsb->s_blocksize != htonl(journal->j_blocksize)) {
 670                 com_err(ctx->program_name, EXT2_ET_CORRUPT_JOURNAL_SB,
 671                         _("%s: no valid journal superblock found\n"),
 672                         ctx->device_name);
 673                 return EXT2_ET_CORRUPT_JOURNAL_SB;
 674         }
 675
 676         if (ntohl(jsb->s_maxlen) < journal->j_maxlen)
 677                 journal->j_maxlen = ntohl(jsb->s_maxlen);
 678         else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) {
 679                 com_err(ctx->program_name, EXT2_ET_CORRUPT_JOURNAL_SB,
 680                         _("%s: journal too short\n"),
 681                         ctx->device_name);
 682                 return EXT2_ET_CORRUPT_JOURNAL_SB;
 683         }
 684
 685         journal->j_tail_sequence = ntohl(jsb->s_sequence);
 686         journal->j_transaction_sequence = journal->j_tail_sequence;
 687         journal->j_tail = ntohl(jsb->s_start);
 688         journal->j_first = ntohl(jsb->s_first);
 689         journal->j_last = ntohl(jsb->s_maxlen);
 690
 691         return 0;
 692 }
 693
 694 static void e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb,
 695                                        journal_t *journal)
 696 {
 697         char *p;
 698         union {
 699                 uuid_t uuid;
 700                 __u32 val[4];
 701         } u;
 702         __u32 new_seq = 0;
 703         int i;
 704
 705         /* Leave a valid existing V1 superblock signature alone.
 706          * Anything unrecognisable we overwrite with a new V2
 707          * signature. */
 708
 709         if (jsb->s_header.h_magic != htonl(JBD2_MAGIC_NUMBER) ||
 710             jsb->s_header.h_blocktype != htonl(JBD2_SUPERBLOCK_V1)) {
 711                 jsb->s_header.h_magic = htonl(JBD2_MAGIC_NUMBER);
 712                 jsb->s_header.h_blocktype = htonl(JBD2_SUPERBLOCK_V2);
 713         }
 714
 715         /* Zero out everything else beyond the superblock header */
 716
 717         p = ((char *) jsb) + sizeof(journal_header_t);
 718         memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t));
 719
 720         jsb->s_blocksize = htonl(ctx->fs->blocksize);
 721         jsb->s_maxlen = htonl(journal->j_maxlen);
 722         jsb->s_first = htonl(1);
 723
 724         /* Initialize the journal sequence number so that there is "no"
 725          * chance we will find old "valid" transactions in the journal.
 726          * This avoids the need to zero the whole journal (slow to do,
 727          * and risky when we are just recovering the filesystem).
 728          */
 729         uuid_generate(u.uuid);
 730         for (i = 0; i < 4; i ++)
 731                 new_seq ^= u.val[i];
 732         jsb->s_sequence = htonl(new_seq);
 733         e2fsck_journal_sb_csum_set(journal, jsb);
 734
 735         mark_buffer_dirty(journal->j_sb_buffer);
 736         ll_rw_block(REQ_OP_WRITE, 0, 1, &journal->j_sb_buffer);
 737 }
 738
 739 static errcode_t e2fsck_journal_fix_corrupt_super(e2fsck_t ctx,
 740                                                   journal_t *journal,
 741                                                   struct problem_context *pctx)
 742 {
 743         struct ext2_super_block *sb = ctx->fs->super;
 744         int recover = ext2fs_has_feature_journal_needs_recovery(ctx->fs->super);
 745
 746         if (ext2fs_has_feature_journal(sb)) {
 747                 if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) {
 748                         e2fsck_journal_reset_super(ctx, journal->j_superblock,
 749                                                    journal);
 750                         journal->j_transaction_sequence = 1;
 751                         e2fsck_clear_recover(ctx, recover);
 752                         return 0;
 753                 }
 754                 return EXT2_ET_CORRUPT_JOURNAL_SB;
 755         } else if (e2fsck_journal_fix_bad_inode(ctx, pctx))
 756                 return EXT2_ET_CORRUPT_JOURNAL_SB;
 757
 758         return 0;
 759 }
 760
 761 static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal,
 762                                    int reset, int drop)
 763 {
 764         journal_superblock_t *jsb;
 765
 766         if (drop)
 767                 mark_buffer_clean(journal->j_sb_buffer);
 768         else if (!(ctx->options & E2F_OPT_READONLY)) {
 769                 jsb = journal->j_superblock;
 770                 jsb->s_sequence = htonl(journal->j_tail_sequence);
 771                 if (reset)
 772                         jsb->s_start = 0; /* this marks the journal as empty */
 773                 e2fsck_journal_sb_csum_set(journal, jsb);
 774                 mark_buffer_dirty(journal->j_sb_buffer);
 775         }
 776         brelse(journal->j_sb_buffer);
 777
 778         if (ctx->journal_io) {
 779                 if (ctx->fs && ctx->fs->io != ctx->journal_io)
 780                         io_channel_close(ctx->journal_io);
 781                 ctx->journal_io = 0;
 782         }
 783
 784 #ifndef USE_INODE_IO
 785         if (journal->j_inode)
 786                 ext2fs_free_mem(&journal->j_inode);
 787 #endif
 788         if (journal->j_fs_dev)
 789                 ext2fs_free_mem(&journal->j_fs_dev);
 790         ext2fs_free_mem(&journal);
 791 }
 792
 793 /*
 794  * This function makes sure that the superblock fields regarding the
 795  * journal are consistent.
 796  */
 797 errcode_t e2fsck_check_ext3_journal(e2fsck_t ctx)
 798 {
 799         struct ext2_super_block *sb = ctx->fs->super;
 800         journal_t *journal;
 801         int recover = ext2fs_has_feature_journal_needs_recovery(ctx->fs->super);
 802         struct problem_context pctx;
 803         problem_t problem;
 804         int reset = 0, force_fsck = 0;
 805         errcode_t retval;
 806
 807         /* If we don't have any journal features, don't do anything more */
 808         if (!ext2fs_has_feature_journal(sb) &&
 809             !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 &&
 810             uuid_is_null(sb->s_journal_uuid))
 811                 return 0;
 812
 813         clear_problem_context(&pctx);
 814         pctx.num = sb->s_journal_inum;
 815
 816         retval = e2fsck_get_journal(ctx, &journal);
 817         if (retval) {
 818                 if ((retval == EXT2_ET_BAD_INODE_NUM) ||
 819                     (retval == EXT2_ET_BAD_BLOCK_NUM) ||
 820                     (retval == EXT2_ET_JOURNAL_TOO_SMALL) ||
 821                     (retval == EXT2_ET_NO_JOURNAL))
 822                         return e2fsck_journal_fix_bad_inode(ctx, &pctx);
 823                 return retval;
 824         }
 825
 826         retval = e2fsck_journal_load(journal);
 827         if (retval) {
 828                 if ((retval == EXT2_ET_CORRUPT_JOURNAL_SB) ||
 829                     ((retval == EXT2_ET_UNSUPP_FEATURE) &&
 830                     (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_INCOMPAT,
 831                                   &pctx))) ||
 832                     ((retval == EXT2_ET_RO_UNSUPP_FEATURE) &&
 833                     (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_ROCOMPAT,
 834                                   &pctx))) ||
 835                     ((retval == EXT2_ET_JOURNAL_UNSUPP_VERSION) &&
 836                     (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_VERSION, &pctx))))
 837                         retval = e2fsck_journal_fix_corrupt_super(ctx, journal,
 838                                                                   &pctx);
 839                 e2fsck_journal_release(ctx, journal, 0, 1);
 840                 return retval;
 841         }
 842
 843         /*
 844          * We want to make the flags consistent here.  We will not leave with
 845          * needs_recovery set but has_journal clear.  We can't get in a loop
 846          * with -y, -n, or -p, only if a user isn't making up their mind.
 847          */
 848 no_has_journal:
 849         if (!ext2fs_has_feature_journal(sb)) {
 850                 recover = ext2fs_has_feature_journal_needs_recovery(sb);
 851                 if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) {
 852                         if (recover &&
 853                             !fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx))
 854                                 goto no_has_journal;
 855                         /*
 856                          * Need a full fsck if we are releasing a
 857                          * journal stored on a reserved inode.
 858                          */
 859                         force_fsck = recover ||
 860                                 (sb->s_journal_inum < EXT2_FIRST_INODE(sb));
 861                         /* Clear all of the journal fields */
 862                         sb->s_journal_inum = 0;
 863                         sb->s_journal_dev = 0;
 864                         memset(sb->s_journal_uuid, 0,
 865                                sizeof(sb->s_journal_uuid));
 866                         e2fsck_clear_recover(ctx, force_fsck);
 867                 } else if (!(ctx->options & E2F_OPT_READONLY)) {
 868                         ext2fs_set_feature_journal(sb);
 869                         ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 870                         ext2fs_mark_super_dirty(ctx->fs);
 871                 }
 872         }
 873
 874         if (ext2fs_has_feature_journal(sb) &&
 875             !ext2fs_has_feature_journal_needs_recovery(sb) &&
 876             journal->j_superblock->s_start != 0) {
 877                 /* Print status information */
 878                 fix_problem(ctx, PR_0_JOURNAL_RECOVERY_CLEAR, &pctx);
 879                 if (ctx->superblock)
 880                         problem = PR_0_JOURNAL_RUN_DEFAULT;
 881                 else
 882                         problem = PR_0_JOURNAL_RUN;
 883                 if (fix_problem(ctx, problem, &pctx)) {
 884                         ctx->options |= E2F_OPT_FORCE;
 885                         ext2fs_set_feature_journal_needs_recovery(sb);
 886                         ext2fs_mark_super_dirty(ctx->fs);
 887                 } else if (fix_problem(ctx,
 888                                        PR_0_JOURNAL_RESET_JOURNAL, &pctx)) {
 889                         reset = 1;
 890                         sb->s_state &= ~EXT2_VALID_FS;
 891                         ext2fs_mark_super_dirty(ctx->fs);
 892                 }
 893                 /*
 894                  * If the user answers no to the above question, we
 895                  * ignore the fact that journal apparently has data;
 896                  * accidentally replaying over valid data would be far
 897                  * worse than skipping a questionable recovery.
 898                  *
 899                  * XXX should we abort with a fatal error here?  What
 900                  * will the ext3 kernel code do if a filesystem with
 901                  * !NEEDS_RECOVERY but with a non-zero
 902                  * journal->j_superblock->s_start is mounted?
 903                  */
 904         }
 905
 906         /*
 907          * If we don't need to do replay the journal, check to see if
 908          * the journal's errno is set; if so, we need to mark the file
 909          * system as being corrupt and clear the journal's s_errno.
 910          */
 911         if (!ext2fs_has_feature_journal_needs_recovery(sb) &&
 912             journal->j_superblock->s_errno) {
 913                 ctx->fs->super->s_state |= EXT2_ERROR_FS;
 914                 ext2fs_mark_super_dirty(ctx->fs);
 915                 journal->j_superblock->s_errno = 0;
 916                 e2fsck_journal_sb_csum_set(journal, journal->j_superblock);
 917                 mark_buffer_dirty(journal->j_sb_buffer);
 918         }
 919
 920         e2fsck_journal_release(ctx, journal, reset, 0);
 921         return retval;
 922 }
 923
 924 static errcode_t recover_ext3_journal(e2fsck_t ctx)
 925 {
 926         struct problem_context  pctx;
 927         journal_t *journal;
 928         errcode_t retval;
 929
 930         clear_problem_context(&pctx);
 931
 932         retval = jbd2_journal_init_revoke_record_cache();
 933         if (retval)
 934                 return retval;
 935
 936         retval = jbd2_journal_init_revoke_table_cache();
 937         if (retval)
 938                 return retval;
 939
 940         retval = e2fsck_get_journal(ctx, &journal);
 941         if (retval)
 942                 return retval;
 943
 944         retval = e2fsck_journal_load(journal);
 945         if (retval)
 946                 goto errout;
 947
 948         retval = jbd2_journal_init_revoke(journal, 1024);
 949         if (retval)
 950                 goto errout;
 951
 952         retval = -jbd2_journal_recover(journal);
 953         if (retval)
 954                 goto errout;
 955
 956         if (journal->j_failed_commit) {
 957                 pctx.ino = journal->j_failed_commit;
 958                 fix_problem(ctx, PR_0_JNL_TXN_CORRUPT, &pctx);
 959                 journal->j_superblock->s_errno = -EINVAL;
 960                 mark_buffer_dirty(journal->j_sb_buffer);
 961         }
 962
 963         journal->j_tail_sequence = journal->j_transaction_sequence;
 964
 965 errout:
 966         jbd2_journal_destroy_revoke(journal);
 967         jbd2_journal_destroy_revoke_record_cache();
 968         jbd2_journal_destroy_revoke_table_cache();
 969         e2fsck_journal_release(ctx, journal, 1, 0);
 970         return retval;
 971 }
 972
 973 errcode_t e2fsck_run_ext3_journal(e2fsck_t ctx)
 974 {
 975         io_manager io_ptr = ctx->fs->io->manager;
 976         int blocksize = ctx->fs->blocksize;
 977         errcode_t       retval, recover_retval;
 978         io_stats        stats = 0;
 979         unsigned long long kbytes_written = 0;
 980
 981         printf(_("%s: recovering journal\n"), ctx->device_name);
 982         if (ctx->options & E2F_OPT_READONLY) {
 983                 printf(_("%s: won't do journal recovery while read-only\n"),
 984                        ctx->device_name);
 985                 return EXT2_ET_FILE_RO;
 986         }
 987
 988         if (ctx->fs->flags & EXT2_FLAG_DIRTY)
 989                 ext2fs_flush(ctx->fs);  /* Force out any modifications */
 990
 991         recover_retval = recover_ext3_journal(ctx);
 992
 993         /*
 994          * Reload the filesystem context to get up-to-date data from disk
 995          * because journal recovery will change the filesystem under us.
 996          */
 997         if (ctx->fs->super->s_kbytes_written &&
 998             ctx->fs->io->manager->get_stats)
 999                 ctx->fs->io->manager->get_stats(ctx->fs->io, &stats);
1000         if (stats && stats->bytes_written)
1001                 kbytes_written = stats->bytes_written >> 10;
1002
1003         ext2fs_mmp_stop(ctx->fs);
1004         ext2fs_free(ctx->fs);
1005         retval = ext2fs_open(ctx->filesystem_name, ctx->openfs_flags,
1006                              ctx->superblock, blocksize, io_ptr,
1007                              &ctx->fs);
1008         if (retval) {
1009                 com_err(ctx->program_name, retval,
1010                         _("while trying to re-open %s"),
1011                         ctx->device_name);
1012                 fatal_error(ctx, 0);
1013         }
1014         ctx->fs->priv_data = ctx;
1015         ctx->fs->now = ctx->now;
1016         ctx->fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
1017         ctx->fs->super->s_kbytes_written += kbytes_written;
1018
1019         /* Set the superblock flags */
1020         e2fsck_clear_recover(ctx, recover_retval != 0);
1021
1022         /*
1023          * Do one last sanity check, and propagate journal->s_errno to
1024          * the EXT2_ERROR_FS flag in the fs superblock if needed.
1025          */
1026         retval = e2fsck_check_ext3_journal(ctx);
1027         return retval ? retval : recover_retval;
1028 }
1029
1030 /*
1031  * This function will move the journal inode from a visible file in
1032  * the filesystem directory hierarchy to the reserved inode if necessary.
1033  */
1034 static const char * const journal_names[] = {
1035         ".journal", "journal", ".journal.dat", "journal.dat", 0 };
1036
1037 void e2fsck_move_ext3_journal(e2fsck_t ctx)
1038 {
1039         struct ext2_super_block *sb = ctx->fs->super;
1040         struct problem_context  pctx;
1041         struct ext2_inode       inode;
1042         ext2_filsys             fs = ctx->fs;
1043         ext2_ino_t              ino;
1044         errcode_t               retval;
1045         const char * const *    cpp;
1046         dgrp_t                  group;
1047         int                     mount_flags;
1048
1049         clear_problem_context(&pctx);
1050
1051         /*
1052          * If the filesystem is opened read-only, or there is no
1053          * journal, then do nothing.
1054          */
1055         if ((ctx->options & E2F_OPT_READONLY) ||
1056             (sb->s_journal_inum == 0) ||
1057             !ext2fs_has_feature_journal(sb))
1058                 return;
1059
1060         /*
1061          * Read in the journal inode
1062          */
1063         if (ext2fs_read_inode(fs, sb->s_journal_inum, &inode) != 0)
1064                 return;
1065
1066         /*
1067          * If it's necessary to backup the journal inode, do so.
1068          */
1069         if ((sb->s_jnl_backup_type == 0) ||
1070             ((sb->s_jnl_backup_type == EXT3_JNL_BACKUP_BLOCKS) &&
1071              memcmp(inode.i_block, sb->s_jnl_blocks, EXT2_N_BLOCKS*4))) {
1072                 if (fix_problem(ctx, PR_0_BACKUP_JNL, &pctx)) {
1073                         memcpy(sb->s_jnl_blocks, inode.i_block,
1074                                EXT2_N_BLOCKS*4);
1075                         sb->s_jnl_blocks[15] = inode.i_size_high;
1076                         sb->s_jnl_blocks[16] = inode.i_size;
1077                         sb->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
1078                         ext2fs_mark_super_dirty(fs);
1079                         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
1080                 }
1081         }
1082
1083         /*
1084          * If the journal is already the hidden inode, then do nothing
1085          */
1086         if (sb->s_journal_inum == EXT2_JOURNAL_INO)
1087                 return;
1088
1089         /*
1090          * The journal inode had better have only one link and not be readable.
1091          */
1092         if (inode.i_links_count != 1)
1093                 return;
1094
1095         /*
1096          * If the filesystem is mounted, or we can't tell whether
1097          * or not it's mounted, do nothing.
1098          */
1099         retval = ext2fs_check_if_mounted(ctx->filesystem_name, &mount_flags);
1100         if (retval || (mount_flags & EXT2_MF_MOUNTED))
1101                 return;
1102
1103         /*
1104          * If we can't find the name of the journal inode, then do
1105          * nothing.
1106          */
1107         for (cpp = journal_names; *cpp; cpp++) {
1108                 retval = ext2fs_lookup(fs, EXT2_ROOT_INO, *cpp,
1109                                        strlen(*cpp), 0, &ino);
1110                 if ((retval == 0) && (ino == sb->s_journal_inum))
1111                         break;
1112         }
1113         if (*cpp == 0)
1114                 return;
1115
1116         /* We need the inode bitmap to be loaded */
1117         retval = ext2fs_read_bitmaps(fs);
1118         if (retval)
1119                 return;
1120
1121         pctx.str = *cpp;
1122         if (!fix_problem(ctx, PR_0_MOVE_JOURNAL, &pctx))
1123                 return;
1124
1125         /*
1126          * OK, we've done all the checks, let's actually move the
1127          * journal inode.  Errors at this point mean we need to force
1128          * an ext2 filesystem check.
1129          */
1130         if ((retval = ext2fs_unlink(fs, EXT2_ROOT_INO, *cpp, ino, 0)) != 0)
1131                 goto err_out;
1132         if ((retval = ext2fs_write_inode(fs, EXT2_JOURNAL_INO, &inode)) != 0)
1133                 goto err_out;
1134         sb->s_journal_inum = EXT2_JOURNAL_INO;
1135         ext2fs_mark_super_dirty(fs);
1136         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
1137         inode.i_links_count = 0;
1138         inode.i_dtime = ctx->now;
1139         if ((retval = ext2fs_write_inode(fs, ino, &inode)) != 0)
1140                 goto err_out;
1141
1142         group = ext2fs_group_of_ino(fs, ino);
1143         ext2fs_unmark_inode_bitmap2(fs->inode_map, ino);
1144         ext2fs_mark_ib_dirty(fs);
1145         ext2fs_bg_free_inodes_count_set(fs, group, ext2fs_bg_free_inodes_count(fs, group) + 1);
1146         ext2fs_group_desc_csum_set(fs, group);
1147         fs->super->s_free_inodes_count++;
1148         return;
1149
1150 err_out:
1151         pctx.errcode = retval;
1152         fix_problem(ctx, PR_0_ERR_MOVE_JOURNAL, &pctx);
1153         fs->super->s_state &= ~EXT2_VALID_FS;
1154         ext2fs_mark_super_dirty(fs);
1155         return;
1156 }
1157
1158 /*
1159  * This function makes sure the superblock hint for the external
1160  * journal is correct.
1161  */
1162 int e2fsck_fix_ext3_journal_hint(e2fsck_t ctx)
1163 {
1164         struct ext2_super_block *sb = ctx->fs->super;
1165         struct problem_context pctx;
1166         char uuid[37], *journal_name;
1167         struct stat st;
1168
1169         if (!ext2fs_has_feature_journal(sb) ||
1170             uuid_is_null(sb->s_journal_uuid))
1171                 return 0;
1172
1173         uuid_unparse(sb->s_journal_uuid, uuid);
1174         journal_name = blkid_get_devname(ctx->blkid, "UUID", uuid);
1175         if (!journal_name)
1176                 return 0;
1177
1178         if (stat(journal_name, &st) < 0) {
1179                 free(journal_name);
1180                 return 0;
1181         }
1182
1183         if (st.st_rdev != sb->s_journal_dev) {
1184                 clear_problem_context(&pctx);
1185                 pctx.num = st.st_rdev;
1186                 if (fix_problem(ctx, PR_0_EXTERNAL_JOURNAL_HINT, &pctx)) {
1187                         sb->s_journal_dev = st.st_rdev;
1188                         ext2fs_mark_super_dirty(ctx->fs);
1189                 }
1190         }
1191
1192         free(journal_name);
1193         return 0;
1194 }