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 (!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 (!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 (!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 journal_bmap(journal_t *journal, blk64_t block, unsigned long long *phys)
  98 {
  99 #ifdef USE_INODE_IO
 100         *phys = block;
 101         return 0;
 102 #else
 103         struct inode    *inode = journal->j_inode;
 104         errcode_t       retval;
 105         blk64_t         pblk;
 106
 107         if (!inode) {
 108                 *phys = block;
 109                 return 0;
 110         }
 111
 112         retval= ext2fs_bmap2(inode->i_ctx->fs, inode->i_ino,
 113                              &inode->i_ext2, NULL, 0, block, 0, &pblk);
 114         *phys = pblk;
 115         return (int) retval;
 116 #endif
 117 }
 118
 119 struct buffer_head *getblk(kdev_t kdev, blk64_t blocknr, int blocksize)
 120 {
 121         struct buffer_head *bh;
 122         int bufsize = sizeof(*bh) + kdev->k_ctx->fs->blocksize -
 123                 sizeof(bh->b_data);
 124
 125         bh = e2fsck_allocate_memory(kdev->k_ctx, bufsize, "block buffer");
 126         if (!bh)
 127                 return NULL;
 128
 129 #ifdef CONFIG_JBD_DEBUG
 130         if (journal_enable_debug >= 3)
 131                 bh_count++;
 132 #endif
 133         jfs_debug(4, "getblk for block %llu (%d bytes)(total %d)\n",
 134                   (unsigned long long) blocknr, blocksize, bh_count);
 135
 136         bh->b_ctx = kdev->k_ctx;
 137         if (kdev->k_dev == K_DEV_FS)
 138                 bh->b_io = kdev->k_ctx->fs->io;
 139         else
 140                 bh->b_io = kdev->k_ctx->journal_io;
 141         bh->b_size = blocksize;
 142         bh->b_blocknr = blocknr;
 143
 144         return bh;
 145 }
 146
 147 int sync_blockdev(kdev_t kdev)
 148 {
 149         io_channel      io;
 150
 151         if (kdev->k_dev == K_DEV_FS)
 152                 io = kdev->k_ctx->fs->io;
 153         else
 154                 io = kdev->k_ctx->journal_io;
 155
 156         return io_channel_flush(io) ? EIO : 0;
 157 }
 158
 159 void ll_rw_block(int rw, int nr, struct buffer_head *bhp[])
 160 {
 161         errcode_t retval;
 162         struct buffer_head *bh;
 163
 164         for (; nr > 0; --nr) {
 165                 bh = *bhp++;
 166                 if (rw == READ && !bh->b_uptodate) {
 167                         jfs_debug(3, "reading block %llu/%p\n",
 168                                   bh->b_blocknr, (void *) bh);
 169                         retval = io_channel_read_blk64(bh->b_io,
 170                                                      bh->b_blocknr,
 171                                                      1, bh->b_data);
 172                         if (retval) {
 173                                 com_err(bh->b_ctx->device_name, retval,
 174                                         "while reading block %llu\n",
 175                                         bh->b_blocknr);
 176                                 bh->b_err = (int) retval;
 177                                 continue;
 178                         }
 179                         bh->b_uptodate = 1;
 180                 } else if (rw == WRITE && bh->b_dirty) {
 181                         jfs_debug(3, "writing block %llu/%p\n",
 182                                   bh->b_blocknr,
 183                                   (void *) bh);
 184                         retval = io_channel_write_blk64(bh->b_io,
 185                                                       bh->b_blocknr,
 186                                                       1, bh->b_data);
 187                         if (retval) {
 188                                 com_err(bh->b_ctx->device_name, retval,
 189                                         "while writing block %llu\n",
 190                                         bh->b_blocknr);
 191                                 bh->b_err = (int) retval;
 192                                 continue;
 193                         }
 194                         bh->b_dirty = 0;
 195                         bh->b_uptodate = 1;
 196                 } else {
 197                         jfs_debug(3, "no-op %s for block %llu\n",
 198                                   rw == READ ? "read" : "write",
 199                                   bh->b_blocknr);
 200                 }
 201         }
 202 }
 203
 204 void mark_buffer_dirty(struct buffer_head *bh)
 205 {
 206         bh->b_dirty = 1;
 207 }
 208
 209 static void mark_buffer_clean(struct buffer_head * bh)
 210 {
 211         bh->b_dirty = 0;
 212 }
 213
 214 void brelse(struct buffer_head *bh)
 215 {
 216         if (bh->b_dirty)
 217                 ll_rw_block(WRITE, 1, &bh);
 218         jfs_debug(3, "freeing block %llu/%p (total %d)\n",
 219                   bh->b_blocknr, (void *) bh, --bh_count);
 220         ext2fs_free_mem(&bh);
 221 }
 222
 223 int buffer_uptodate(struct buffer_head *bh)
 224 {
 225         return bh->b_uptodate;
 226 }
 227
 228 void mark_buffer_uptodate(struct buffer_head *bh, int val)
 229 {
 230         bh->b_uptodate = val;
 231 }
 232
 233 void wait_on_buffer(struct buffer_head *bh)
 234 {
 235         if (!bh->b_uptodate)
 236                 ll_rw_block(READ, 1, &bh);
 237 }
 238
 239
 240 static void e2fsck_clear_recover(e2fsck_t ctx, int error)
 241 {
 242         ext2fs_clear_feature_journal_needs_recovery(ctx->fs->super);
 243
 244         /* if we had an error doing journal recovery, we need a full fsck */
 245         if (error)
 246                 ctx->fs->super->s_state &= ~EXT2_VALID_FS;
 247         ext2fs_mark_super_dirty(ctx->fs);
 248 }
 249
 250 /*
 251  * This is a helper function to check the validity of the journal.
 252  */
 253 struct process_block_struct {
 254         e2_blkcnt_t     last_block;
 255 };
 256
 257 static int process_journal_block(ext2_filsys fs,
 258                                  blk64_t        *block_nr,
 259                                  e2_blkcnt_t blockcnt,
 260                                  blk64_t ref_block EXT2FS_ATTR((unused)),
 261                                  int ref_offset EXT2FS_ATTR((unused)),
 262                                  void *priv_data)
 263 {
 264         struct process_block_struct *p;
 265         blk64_t blk = *block_nr;
 266
 267         p = (struct process_block_struct *) priv_data;
 268
 269         if (!blk || blk < fs->super->s_first_data_block ||
 270             blk >= ext2fs_blocks_count(fs->super))
 271                 return BLOCK_ABORT;
 272
 273         if (blockcnt >= 0)
 274                 p->last_block = blockcnt;
 275         return 0;
 276 }
 277
 278 static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal)
 279 {
 280         struct process_block_struct pb;
 281         struct ext2_super_block *sb = ctx->fs->super;
 282         struct ext2_super_block jsuper;
 283         struct problem_context  pctx;
 284         struct buffer_head      *bh;
 285         struct inode            *j_inode = NULL;
 286         struct kdev_s           *dev_fs = NULL, *dev_journal;
 287         const char              *journal_name = 0;
 288         journal_t               *journal = NULL;
 289         errcode_t               retval = 0;
 290         io_manager              io_ptr = 0;
 291         unsigned long long      start = 0;
 292         int                     ext_journal = 0;
 293         int                     tried_backup_jnl = 0;
 294
 295         clear_problem_context(&pctx);
 296
 297         journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal");
 298         if (!journal) {
 299                 return EXT2_ET_NO_MEMORY;
 300         }
 301
 302         dev_fs = e2fsck_allocate_memory(ctx, 2*sizeof(struct kdev_s), "kdev");
 303         if (!dev_fs) {
 304                 retval = EXT2_ET_NO_MEMORY;
 305                 goto errout;
 306         }
 307         dev_journal = dev_fs+1;
 308
 309         dev_fs->k_ctx = dev_journal->k_ctx = ctx;
 310         dev_fs->k_dev = K_DEV_FS;
 311         dev_journal->k_dev = K_DEV_JOURNAL;
 312
 313         journal->j_dev = dev_journal;
 314         journal->j_fs_dev = dev_fs;
 315         journal->j_inode = NULL;
 316         journal->j_blocksize = ctx->fs->blocksize;
 317
 318         if (uuid_is_null(sb->s_journal_uuid)) {
 319                 if (!sb->s_journal_inum) {
 320                         retval = EXT2_ET_BAD_INODE_NUM;
 321                         goto errout;
 322                 }
 323                 j_inode = e2fsck_allocate_memory(ctx, sizeof(*j_inode),
 324                                                  "journal inode");
 325                 if (!j_inode) {
 326                         retval = EXT2_ET_NO_MEMORY;
 327                         goto errout;
 328                 }
 329
 330                 j_inode->i_ctx = ctx;
 331                 j_inode->i_ino = sb->s_journal_inum;
 332
 333                 if ((retval = ext2fs_read_inode(ctx->fs,
 334                                                 sb->s_journal_inum,
 335                                                 &j_inode->i_ext2))) {
 336                 try_backup_journal:
 337                         if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS ||
 338                             tried_backup_jnl)
 339                                 goto errout;
 340                         memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode));
 341                         memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks,
 342                                EXT2_N_BLOCKS*4);
 343                         j_inode->i_ext2.i_size_high = sb->s_jnl_blocks[15];
 344                         j_inode->i_ext2.i_size = sb->s_jnl_blocks[16];
 345                         j_inode->i_ext2.i_links_count = 1;
 346                         j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600;
 347                         e2fsck_use_inode_shortcuts(ctx, 1);
 348                         ctx->stashed_ino = j_inode->i_ino;
 349                         ctx->stashed_inode = &j_inode->i_ext2;
 350                         tried_backup_jnl++;
 351                 }
 352                 if (!j_inode->i_ext2.i_links_count ||
 353                     !LINUX_S_ISREG(j_inode->i_ext2.i_mode)) {
 354                         retval = EXT2_ET_NO_JOURNAL;
 355                         goto try_backup_journal;
 356                 }
 357                 if (EXT2_I_SIZE(&j_inode->i_ext2) / journal->j_blocksize <
 358                     JFS_MIN_JOURNAL_BLOCKS) {
 359                         retval = EXT2_ET_JOURNAL_TOO_SMALL;
 360                         goto try_backup_journal;
 361                 }
 362                 pb.last_block = -1;
 363                 retval = ext2fs_block_iterate3(ctx->fs, j_inode->i_ino,
 364                                                BLOCK_FLAG_HOLE, 0,
 365                                                process_journal_block, &pb);
 366                 if ((pb.last_block + 1) * ctx->fs->blocksize <
 367                     (int) EXT2_I_SIZE(&j_inode->i_ext2)) {
 368                         retval = EXT2_ET_JOURNAL_TOO_SMALL;
 369                         goto try_backup_journal;
 370                 }
 371                 if (tried_backup_jnl && !(ctx->options & E2F_OPT_READONLY)) {
 372                         retval = ext2fs_write_inode(ctx->fs, sb->s_journal_inum,
 373                                                     &j_inode->i_ext2);
 374                         if (retval)
 375                                 goto errout;
 376                 }
 377
 378                 journal->j_maxlen = EXT2_I_SIZE(&j_inode->i_ext2) /
 379                         journal->j_blocksize;
 380
 381 #ifdef USE_INODE_IO
 382                 retval = ext2fs_inode_io_intern2(ctx->fs, sb->s_journal_inum,
 383                                                  &j_inode->i_ext2,
 384                                                  &journal_name);
 385                 if (retval)
 386                         goto errout;
 387
 388                 io_ptr = inode_io_manager;
 389 #else
 390                 journal->j_inode = j_inode;
 391                 ctx->journal_io = ctx->fs->io;
 392                 if ((retval = (errcode_t) journal_bmap(journal, 0, &start)) != 0)
 393                         goto errout;
 394 #endif
 395         } else {
 396                 ext_journal = 1;
 397                 if (!ctx->journal_name) {
 398                         char uuid[37];
 399
 400                         uuid_unparse(sb->s_journal_uuid, uuid);
 401                         ctx->journal_name = blkid_get_devname(ctx->blkid,
 402                                                               "UUID", uuid);
 403                         if (!ctx->journal_name)
 404                                 ctx->journal_name = blkid_devno_to_devname(sb->s_journal_dev);
 405                 }
 406                 journal_name = ctx->journal_name;
 407
 408                 if (!journal_name) {
 409                         fix_problem(ctx, PR_0_CANT_FIND_JOURNAL, &pctx);
 410                         retval = EXT2_ET_LOAD_EXT_JOURNAL;
 411                         goto errout;
 412                 }
 413
 414                 jfs_debug(1, "Using journal file %s\n", journal_name);
 415                 io_ptr = unix_io_manager;
 416         }
 417
 418 #if 0
 419         test_io_backing_manager = io_ptr;
 420         io_ptr = test_io_manager;
 421 #endif
 422 #ifndef USE_INODE_IO
 423         if (ext_journal)
 424 #endif
 425         {
 426                 int flags = IO_FLAG_RW;
 427                 if (!(ctx->mount_flags & EXT2_MF_ISROOT &&
 428                       ctx->mount_flags & EXT2_MF_READONLY))
 429                         flags |= IO_FLAG_EXCLUSIVE;
 430                 if ((ctx->mount_flags & EXT2_MF_READONLY) &&
 431                     (ctx->options & E2F_OPT_FORCE))
 432                         flags &= ~IO_FLAG_EXCLUSIVE;
 433
 434
 435                 retval = io_ptr->open(journal_name, flags,
 436                                       &ctx->journal_io);
 437         }
 438         if (retval)
 439                 goto errout;
 440
 441         io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize);
 442
 443         if (ext_journal) {
 444                 blk64_t maxlen;
 445
 446                 start = ext2fs_journal_sb_start(ctx->fs->blocksize) - 1;
 447                 bh = getblk(dev_journal, start, ctx->fs->blocksize);
 448                 if (!bh) {
 449                         retval = EXT2_ET_NO_MEMORY;
 450                         goto errout;
 451                 }
 452                 ll_rw_block(READ, 1, &bh);
 453                 if ((retval = bh->b_err) != 0) {
 454                         brelse(bh);
 455                         goto errout;
 456                 }
 457                 memcpy(&jsuper, start ? bh->b_data :  bh->b_data + SUPERBLOCK_OFFSET,
 458                        sizeof(jsuper));
 459 #ifdef WORDS_BIGENDIAN
 460                 if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
 461                         ext2fs_swap_super(&jsuper);
 462 #endif
 463                 if (jsuper.s_magic != EXT2_SUPER_MAGIC ||
 464                     !ext2fs_has_feature_journal_dev(&jsuper)) {
 465                         fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx);
 466                         retval = EXT2_ET_LOAD_EXT_JOURNAL;
 467                         brelse(bh);
 468                         goto errout;
 469                 }
 470                 /* Make sure the journal UUID is correct */
 471                 if (memcmp(jsuper.s_uuid, ctx->fs->super->s_journal_uuid,
 472                            sizeof(jsuper.s_uuid))) {
 473                         fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx);
 474                         retval = EXT2_ET_LOAD_EXT_JOURNAL;
 475                         brelse(bh);
 476                         goto errout;
 477                 }
 478
 479                 /* Check the superblock checksum */
 480                 if (ext2fs_has_feature_metadata_csum(&jsuper)) {
 481                         struct struct_ext2_filsys fsx;
 482                         struct ext2_super_block superx;
 483                         void *p;
 484
 485                         p = start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET;
 486                         memcpy(&fsx, ctx->fs, sizeof(fsx));
 487                         memcpy(&superx, ctx->fs->super, sizeof(superx));
 488                         fsx.super = &superx;
 489                         ext2fs_set_feature_metadata_csum(fsx.super);
 490                         if (!ext2fs_superblock_csum_verify(&fsx, p) &&
 491                             fix_problem(ctx, PR_0_EXT_JOURNAL_SUPER_CSUM_INVALID,
 492                                         &pctx)) {
 493                                 ext2fs_superblock_csum_set(&fsx, p);
 494                                 mark_buffer_dirty(bh);
 495                         }
 496                 }
 497                 brelse(bh);
 498
 499                 maxlen = ext2fs_blocks_count(&jsuper);
 500                 journal->j_maxlen = (maxlen < 1ULL << 32) ? maxlen : (1ULL << 32) - 1;
 501                 start++;
 502         }
 503
 504         if (!(bh = getblk(dev_journal, start, journal->j_blocksize))) {
 505                 retval = EXT2_ET_NO_MEMORY;
 506                 goto errout;
 507         }
 508
 509         journal->j_sb_buffer = bh;
 510         journal->j_superblock = (journal_superblock_t *)bh->b_data;
 511
 512 #ifdef USE_INODE_IO
 513         if (j_inode)
 514                 ext2fs_free_mem(&j_inode);
 515 #endif
 516
 517         *ret_journal = journal;
 518         e2fsck_use_inode_shortcuts(ctx, 0);
 519         return 0;
 520
 521 errout:
 522         e2fsck_use_inode_shortcuts(ctx, 0);
 523         if (dev_fs)
 524                 ext2fs_free_mem(&dev_fs);
 525         if (j_inode)
 526                 ext2fs_free_mem(&j_inode);
 527         if (journal)
 528                 ext2fs_free_mem(&journal);
 529         return retval;
 530 }
 531
 532 static errcode_t e2fsck_journal_fix_bad_inode(e2fsck_t ctx,
 533                                               struct problem_context *pctx)
 534 {
 535         struct ext2_super_block *sb = ctx->fs->super;
 536         int recover = ext2fs_has_feature_journal_needs_recovery(ctx->fs->super);
 537         int has_journal = ext2fs_has_feature_journal(ctx->fs->super);
 538
 539         if (has_journal || sb->s_journal_inum) {
 540                 /* The journal inode is bogus, remove and force full fsck */
 541                 pctx->ino = sb->s_journal_inum;
 542                 if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) {
 543                         if (has_journal && sb->s_journal_inum)
 544                                 printf("*** journal has been deleted ***\n\n");
 545                         ext2fs_clear_feature_journal(sb);
 546                         sb->s_journal_inum = 0;
 547                         memset(sb->s_jnl_blocks, 0, sizeof(sb->s_jnl_blocks));
 548                         ctx->flags |= E2F_FLAG_JOURNAL_INODE;
 549                         ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 550                         e2fsck_clear_recover(ctx, 1);
 551                         return 0;
 552                 }
 553                 return EXT2_ET_BAD_INODE_NUM;
 554         } else if (recover) {
 555                 if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) {
 556                         e2fsck_clear_recover(ctx, 1);
 557                         return 0;
 558                 }
 559                 return EXT2_ET_UNSUPP_FEATURE;
 560         }
 561         return 0;
 562 }
 563
 564 #define V1_SB_SIZE      0x0024
 565 static void clear_v2_journal_fields(journal_t *journal)
 566 {
 567         e2fsck_t ctx = journal->j_dev->k_ctx;
 568         struct problem_context pctx;
 569
 570         clear_problem_context(&pctx);
 571
 572         if (!fix_problem(ctx, PR_0_CLEAR_V2_JOURNAL, &pctx))
 573                 return;
 574
 575         memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0,
 576                ctx->fs->blocksize-V1_SB_SIZE);
 577         mark_buffer_dirty(journal->j_sb_buffer);
 578 }
 579
 580
 581 static errcode_t e2fsck_journal_load(journal_t *journal)
 582 {
 583         e2fsck_t ctx = journal->j_dev->k_ctx;
 584         journal_superblock_t *jsb;
 585         struct buffer_head *jbh = journal->j_sb_buffer;
 586         struct problem_context pctx;
 587
 588         clear_problem_context(&pctx);
 589
 590         ll_rw_block(READ, 1, &jbh);
 591         if (jbh->b_err) {
 592                 com_err(ctx->device_name, jbh->b_err, "%s",
 593                         _("reading journal superblock\n"));
 594                 return jbh->b_err;
 595         }
 596
 597         jsb = journal->j_superblock;
 598         /* If we don't even have JFS_MAGIC, we probably have a wrong inode */
 599         if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER))
 600                 return e2fsck_journal_fix_bad_inode(ctx, &pctx);
 601
 602         switch (ntohl(jsb->s_header.h_blocktype)) {
 603         case JFS_SUPERBLOCK_V1:
 604                 journal->j_format_version = 1;
 605                 if (jsb->s_feature_compat ||
 606                     jsb->s_feature_incompat ||
 607                     jsb->s_feature_ro_compat ||
 608                     jsb->s_nr_users)
 609                         clear_v2_journal_fields(journal);
 610                 break;
 611
 612         case JFS_SUPERBLOCK_V2:
 613                 journal->j_format_version = 2;
 614                 if (ntohl(jsb->s_nr_users) > 1 &&
 615                     uuid_is_null(ctx->fs->super->s_journal_uuid))
 616                         clear_v2_journal_fields(journal);
 617                 if (ntohl(jsb->s_nr_users) > 1) {
 618                         fix_problem(ctx, PR_0_JOURNAL_UNSUPP_MULTIFS, &pctx);
 619                         return EXT2_ET_JOURNAL_UNSUPP_VERSION;
 620                 }
 621                 break;
 622
 623         /*
 624          * These should never appear in a journal super block, so if
 625          * they do, the journal is badly corrupted.
 626          */
 627         case JFS_DESCRIPTOR_BLOCK:
 628         case JFS_COMMIT_BLOCK:
 629         case JFS_REVOKE_BLOCK:
 630                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 631
 632         /* If we don't understand the superblock major type, but there
 633          * is a magic number, then it is likely to be a new format we
 634          * just don't understand, so leave it alone. */
 635         default:
 636                 return EXT2_ET_JOURNAL_UNSUPP_VERSION;
 637         }
 638
 639         if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES))
 640                 return EXT2_ET_UNSUPP_FEATURE;
 641
 642         if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES))
 643                 return EXT2_ET_RO_UNSUPP_FEATURE;
 644
 645         /* Checksum v1-3 are mutually exclusive features. */
 646         if (jfs_has_feature_csum2(journal) && jfs_has_feature_csum3(journal))
 647                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 648
 649         if (journal_has_csum_v2or3(journal) &&
 650             jfs_has_feature_checksum(journal))
 651                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 652
 653         if (!e2fsck_journal_verify_csum_type(journal, jsb) ||
 654             !e2fsck_journal_sb_csum_verify(journal, jsb))
 655                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 656
 657         if (journal_has_csum_v2or3(journal))
 658                 journal->j_csum_seed = jbd2_chksum(journal, ~0, jsb->s_uuid,
 659                                                    sizeof(jsb->s_uuid));
 660
 661         /* We have now checked whether we know enough about the journal
 662          * format to be able to proceed safely, so any other checks that
 663          * fail we should attempt to recover from. */
 664         if (jsb->s_blocksize != htonl(journal->j_blocksize)) {
 665                 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK,
 666                         _("%s: no valid journal superblock found\n"),
 667                         ctx->device_name);
 668                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 669         }
 670
 671         if (ntohl(jsb->s_maxlen) < journal->j_maxlen)
 672                 journal->j_maxlen = ntohl(jsb->s_maxlen);
 673         else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) {
 674                 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK,
 675                         _("%s: journal too short\n"),
 676                         ctx->device_name);
 677                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 678         }
 679
 680         journal->j_tail_sequence = ntohl(jsb->s_sequence);
 681         journal->j_transaction_sequence = journal->j_tail_sequence;
 682         journal->j_tail = ntohl(jsb->s_start);
 683         journal->j_first = ntohl(jsb->s_first);
 684         journal->j_last = ntohl(jsb->s_maxlen);
 685
 686         return 0;
 687 }
 688
 689 static void e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb,
 690                                        journal_t *journal)
 691 {
 692         char *p;
 693         union {
 694                 uuid_t uuid;
 695                 __u32 val[4];
 696         } u;
 697         __u32 new_seq = 0;
 698         int i;
 699
 700         /* Leave a valid existing V1 superblock signature alone.
 701          * Anything unrecognisable we overwrite with a new V2
 702          * signature. */
 703
 704         if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER) ||
 705             jsb->s_header.h_blocktype != htonl(JFS_SUPERBLOCK_V1)) {
 706                 jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER);
 707                 jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2);
 708         }
 709
 710         /* Zero out everything else beyond the superblock header */
 711
 712         p = ((char *) jsb) + sizeof(journal_header_t);
 713         memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t));
 714
 715         jsb->s_blocksize = htonl(ctx->fs->blocksize);
 716         jsb->s_maxlen = htonl(journal->j_maxlen);
 717         jsb->s_first = htonl(1);
 718
 719         /* Initialize the journal sequence number so that there is "no"
 720          * chance we will find old "valid" transactions in the journal.
 721          * This avoids the need to zero the whole journal (slow to do,
 722          * and risky when we are just recovering the filesystem).
 723          */
 724         uuid_generate(u.uuid);
 725         for (i = 0; i < 4; i ++)
 726                 new_seq ^= u.val[i];
 727         jsb->s_sequence = htonl(new_seq);
 728         e2fsck_journal_sb_csum_set(journal, jsb);
 729
 730         mark_buffer_dirty(journal->j_sb_buffer);
 731         ll_rw_block(WRITE, 1, &journal->j_sb_buffer);
 732 }
 733
 734 static errcode_t e2fsck_journal_fix_corrupt_super(e2fsck_t ctx,
 735                                                   journal_t *journal,
 736                                                   struct problem_context *pctx)
 737 {
 738         struct ext2_super_block *sb = ctx->fs->super;
 739         int recover = ext2fs_has_feature_journal_needs_recovery(ctx->fs->super);
 740
 741         if (ext2fs_has_feature_journal(sb)) {
 742                 if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) {
 743                         e2fsck_journal_reset_super(ctx, journal->j_superblock,
 744                                                    journal);
 745                         journal->j_transaction_sequence = 1;
 746                         e2fsck_clear_recover(ctx, recover);
 747                         return 0;
 748                 }
 749                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 750         } else if (e2fsck_journal_fix_bad_inode(ctx, pctx))
 751                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 752
 753         return 0;
 754 }
 755
 756 static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal,
 757                                    int reset, int drop)
 758 {
 759         journal_superblock_t *jsb;
 760
 761         if (drop)
 762                 mark_buffer_clean(journal->j_sb_buffer);
 763         else if (!(ctx->options & E2F_OPT_READONLY)) {
 764                 jsb = journal->j_superblock;
 765                 jsb->s_sequence = htonl(journal->j_tail_sequence);
 766                 if (reset)
 767                         jsb->s_start = 0; /* this marks the journal as empty */
 768                 e2fsck_journal_sb_csum_set(journal, jsb);
 769                 mark_buffer_dirty(journal->j_sb_buffer);
 770         }
 771         brelse(journal->j_sb_buffer);
 772
 773         if (ctx->journal_io) {
 774                 if (ctx->fs && ctx->fs->io != ctx->journal_io)
 775                         io_channel_close(ctx->journal_io);
 776                 ctx->journal_io = 0;
 777         }
 778
 779 #ifndef USE_INODE_IO
 780         if (journal->j_inode)
 781                 ext2fs_free_mem(&journal->j_inode);
 782 #endif
 783         if (journal->j_fs_dev)
 784                 ext2fs_free_mem(&journal->j_fs_dev);
 785         ext2fs_free_mem(&journal);
 786 }
 787
 788 /*
 789  * This function makes sure that the superblock fields regarding the
 790  * journal are consistent.
 791  */
 792 errcode_t e2fsck_check_ext3_journal(e2fsck_t ctx)
 793 {
 794         struct ext2_super_block *sb = ctx->fs->super;
 795         journal_t *journal;
 796         int recover = ext2fs_has_feature_journal_needs_recovery(ctx->fs->super);
 797         struct problem_context pctx;
 798         problem_t problem;
 799         int reset = 0, force_fsck = 0;
 800         errcode_t retval;
 801
 802         /* If we don't have any journal features, don't do anything more */
 803         if (!ext2fs_has_feature_journal(sb) &&
 804             !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 &&
 805             uuid_is_null(sb->s_journal_uuid))
 806                 return 0;
 807
 808         clear_problem_context(&pctx);
 809         pctx.num = sb->s_journal_inum;
 810
 811         retval = e2fsck_get_journal(ctx, &journal);
 812         if (retval) {
 813                 if ((retval == EXT2_ET_BAD_INODE_NUM) ||
 814                     (retval == EXT2_ET_BAD_BLOCK_NUM) ||
 815                     (retval == EXT2_ET_JOURNAL_TOO_SMALL) ||
 816                     (retval == EXT2_ET_NO_JOURNAL))
 817                         return e2fsck_journal_fix_bad_inode(ctx, &pctx);
 818                 return retval;
 819         }
 820
 821         retval = e2fsck_journal_load(journal);
 822         if (retval) {
 823                 if ((retval == EXT2_ET_CORRUPT_SUPERBLOCK) ||
 824                     ((retval == EXT2_ET_UNSUPP_FEATURE) &&
 825                     (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_INCOMPAT,
 826                                   &pctx))) ||
 827                     ((retval == EXT2_ET_RO_UNSUPP_FEATURE) &&
 828                     (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_ROCOMPAT,
 829                                   &pctx))) ||
 830                     ((retval == EXT2_ET_JOURNAL_UNSUPP_VERSION) &&
 831                     (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_VERSION, &pctx))))
 832                         retval = e2fsck_journal_fix_corrupt_super(ctx, journal,
 833                                                                   &pctx);
 834                 e2fsck_journal_release(ctx, journal, 0, 1);
 835                 return retval;
 836         }
 837
 838         /*
 839          * We want to make the flags consistent here.  We will not leave with
 840          * needs_recovery set but has_journal clear.  We can't get in a loop
 841          * with -y, -n, or -p, only if a user isn't making up their mind.
 842          */
 843 no_has_journal:
 844         if (!ext2fs_has_feature_journal(sb)) {
 845                 recover = ext2fs_has_feature_journal_needs_recovery(sb);
 846                 if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) {
 847                         if (recover &&
 848                             !fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx))
 849                                 goto no_has_journal;
 850                         /*
 851                          * Need a full fsck if we are releasing a
 852                          * journal stored on a reserved inode.
 853                          */
 854                         force_fsck = recover ||
 855                                 (sb->s_journal_inum < EXT2_FIRST_INODE(sb));
 856                         /* Clear all of the journal fields */
 857                         sb->s_journal_inum = 0;
 858                         sb->s_journal_dev = 0;
 859                         memset(sb->s_journal_uuid, 0,
 860                                sizeof(sb->s_journal_uuid));
 861                         e2fsck_clear_recover(ctx, force_fsck);
 862                 } else if (!(ctx->options & E2F_OPT_READONLY)) {
 863                         ext2fs_set_feature_journal(sb);
 864                         ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 865                         ext2fs_mark_super_dirty(ctx->fs);
 866                 }
 867         }
 868
 869         if (ext2fs_has_feature_journal(sb) &&
 870             !ext2fs_has_feature_journal_needs_recovery(sb) &&
 871             journal->j_superblock->s_start != 0) {
 872                 /* Print status information */
 873                 fix_problem(ctx, PR_0_JOURNAL_RECOVERY_CLEAR, &pctx);
 874                 if (ctx->superblock)
 875                         problem = PR_0_JOURNAL_RUN_DEFAULT;
 876                 else
 877                         problem = PR_0_JOURNAL_RUN;
 878                 if (fix_problem(ctx, problem, &pctx)) {
 879                         ctx->options |= E2F_OPT_FORCE;
 880                         ext2fs_set_feature_journal_needs_recovery(sb);
 881                         ext2fs_mark_super_dirty(ctx->fs);
 882                 } else if (fix_problem(ctx,
 883                                        PR_0_JOURNAL_RESET_JOURNAL, &pctx)) {
 884                         reset = 1;
 885                         sb->s_state &= ~EXT2_VALID_FS;
 886                         ext2fs_mark_super_dirty(ctx->fs);
 887                 }
 888                 /*
 889                  * If the user answers no to the above question, we
 890                  * ignore the fact that journal apparently has data;
 891                  * accidentally replaying over valid data would be far
 892                  * worse than skipping a questionable recovery.
 893                  *
 894                  * XXX should we abort with a fatal error here?  What
 895                  * will the ext3 kernel code do if a filesystem with
 896                  * !NEEDS_RECOVERY but with a non-zero
 897                  * journal->j_superblock->s_start is mounted?
 898                  */
 899         }
 900
 901         /*
 902          * If we don't need to do replay the journal, check to see if
 903          * the journal's errno is set; if so, we need to mark the file
 904          * system as being corrupt and clear the journal's s_errno.
 905          */
 906         if (!ext2fs_has_feature_journal_needs_recovery(sb) &&
 907             journal->j_superblock->s_errno) {
 908                 ctx->fs->super->s_state |= EXT2_ERROR_FS;
 909                 ext2fs_mark_super_dirty(ctx->fs);
 910                 journal->j_superblock->s_errno = 0;
 911                 e2fsck_journal_sb_csum_set(journal, journal->j_superblock);
 912                 mark_buffer_dirty(journal->j_sb_buffer);
 913         }
 914
 915         e2fsck_journal_release(ctx, journal, reset, 0);
 916         return retval;
 917 }
 918
 919 static errcode_t recover_ext3_journal(e2fsck_t ctx)
 920 {
 921         struct problem_context  pctx;
 922         journal_t *journal;
 923         errcode_t retval;
 924
 925         clear_problem_context(&pctx);
 926
 927         journal_init_revoke_caches();
 928         retval = e2fsck_get_journal(ctx, &journal);
 929         if (retval)
 930                 return retval;
 931
 932         retval = e2fsck_journal_load(journal);
 933         if (retval)
 934                 goto errout;
 935
 936         retval = journal_init_revoke(journal, 1024);
 937         if (retval)
 938                 goto errout;
 939
 940         retval = -journal_recover(journal);
 941         if (retval)
 942                 goto errout;
 943
 944         if (journal->j_failed_commit) {
 945                 pctx.ino = journal->j_failed_commit;
 946                 fix_problem(ctx, PR_0_JNL_TXN_CORRUPT, &pctx);
 947                 journal->j_superblock->s_errno = -EINVAL;
 948                 mark_buffer_dirty(journal->j_sb_buffer);
 949         }
 950
 951 errout:
 952         journal_destroy_revoke(journal);
 953         journal_destroy_revoke_caches();
 954         e2fsck_journal_release(ctx, journal, 1, 0);
 955         return retval;
 956 }
 957
 958 errcode_t e2fsck_run_ext3_journal(e2fsck_t ctx)
 959 {
 960         io_manager io_ptr = ctx->fs->io->manager;
 961         int blocksize = ctx->fs->blocksize;
 962         errcode_t       retval, recover_retval;
 963         io_stats        stats = 0;
 964         unsigned long long kbytes_written = 0;
 965
 966         printf(_("%s: recovering journal\n"), ctx->device_name);
 967         if (ctx->options & E2F_OPT_READONLY) {
 968                 printf(_("%s: won't do journal recovery while read-only\n"),
 969                        ctx->device_name);
 970                 return EXT2_ET_FILE_RO;
 971         }
 972
 973         if (ctx->fs->flags & EXT2_FLAG_DIRTY)
 974                 ext2fs_flush(ctx->fs);  /* Force out any modifications */
 975
 976         recover_retval = recover_ext3_journal(ctx);
 977
 978         /*
 979          * Reload the filesystem context to get up-to-date data from disk
 980          * because journal recovery will change the filesystem under us.
 981          */
 982         if (ctx->fs->super->s_kbytes_written &&
 983             ctx->fs->io->manager->get_stats)
 984                 ctx->fs->io->manager->get_stats(ctx->fs->io, &stats);
 985         if (stats && stats->bytes_written)
 986                 kbytes_written = stats->bytes_written >> 10;
 987
 988         ext2fs_mmp_stop(ctx->fs);
 989         ext2fs_free(ctx->fs);
 990         retval = ext2fs_open(ctx->filesystem_name, ctx->openfs_flags,
 991                              ctx->superblock, blocksize, io_ptr,
 992                              &ctx->fs);
 993         if (retval) {
 994                 com_err(ctx->program_name, retval,
 995                         _("while trying to re-open %s"),
 996                         ctx->device_name);
 997                 fatal_error(ctx, 0);
 998         }
 999         ctx->fs->priv_data = ctx;
1000         ctx->fs->now = ctx->now;
1001         ctx->fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
1002         ctx->fs->super->s_kbytes_written += kbytes_written;
1003
1004         /* Set the superblock flags */
1005         e2fsck_clear_recover(ctx, recover_retval != 0);
1006
1007         /*
1008          * Do one last sanity check, and propagate journal->s_errno to
1009          * the EXT2_ERROR_FS flag in the fs superblock if needed.
1010          */
1011         retval = e2fsck_check_ext3_journal(ctx);
1012         return retval ? retval : recover_retval;
1013 }
1014
1015 /*
1016  * This function will move the journal inode from a visible file in
1017  * the filesystem directory hierarchy to the reserved inode if necessary.
1018  */
1019 static const char * const journal_names[] = {
1020         ".journal", "journal", ".journal.dat", "journal.dat", 0 };
1021
1022 void e2fsck_move_ext3_journal(e2fsck_t ctx)
1023 {
1024         struct ext2_super_block *sb = ctx->fs->super;
1025         struct problem_context  pctx;
1026         struct ext2_inode       inode;
1027         ext2_filsys             fs = ctx->fs;
1028         ext2_ino_t              ino;
1029         errcode_t               retval;
1030         const char * const *    cpp;
1031         dgrp_t                  group;
1032         int                     mount_flags;
1033
1034         clear_problem_context(&pctx);
1035
1036         /*
1037          * If the filesystem is opened read-only, or there is no
1038          * journal, then do nothing.
1039          */
1040         if ((ctx->options & E2F_OPT_READONLY) ||
1041             (sb->s_journal_inum == 0) ||
1042             !ext2fs_has_feature_journal(sb))
1043                 return;
1044
1045         /*
1046          * Read in the journal inode
1047          */
1048         if (ext2fs_read_inode(fs, sb->s_journal_inum, &inode) != 0)
1049                 return;
1050
1051         /*
1052          * If it's necessary to backup the journal inode, do so.
1053          */
1054         if ((sb->s_jnl_backup_type == 0) ||
1055             ((sb->s_jnl_backup_type == EXT3_JNL_BACKUP_BLOCKS) &&
1056              memcmp(inode.i_block, sb->s_jnl_blocks, EXT2_N_BLOCKS*4))) {
1057                 if (fix_problem(ctx, PR_0_BACKUP_JNL, &pctx)) {
1058                         memcpy(sb->s_jnl_blocks, inode.i_block,
1059                                EXT2_N_BLOCKS*4);
1060                         sb->s_jnl_blocks[15] = inode.i_size_high;
1061                         sb->s_jnl_blocks[16] = inode.i_size;
1062                         sb->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
1063                         ext2fs_mark_super_dirty(fs);
1064                         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
1065                 }
1066         }
1067
1068         /*
1069          * If the journal is already the hidden inode, then do nothing
1070          */
1071         if (sb->s_journal_inum == EXT2_JOURNAL_INO)
1072                 return;
1073
1074         /*
1075          * The journal inode had better have only one link and not be readable.
1076          */
1077         if (inode.i_links_count != 1)
1078                 return;
1079
1080         /*
1081          * If the filesystem is mounted, or we can't tell whether
1082          * or not it's mounted, do nothing.
1083          */
1084         retval = ext2fs_check_if_mounted(ctx->filesystem_name, &mount_flags);
1085         if (retval || (mount_flags & EXT2_MF_MOUNTED))
1086                 return;
1087
1088         /*
1089          * If we can't find the name of the journal inode, then do
1090          * nothing.
1091          */
1092         for (cpp = journal_names; *cpp; cpp++) {
1093                 retval = ext2fs_lookup(fs, EXT2_ROOT_INO, *cpp,
1094                                        strlen(*cpp), 0, &ino);
1095                 if ((retval == 0) && (ino == sb->s_journal_inum))
1096                         break;
1097         }
1098         if (*cpp == 0)
1099                 return;
1100
1101         /* We need the inode bitmap to be loaded */
1102         retval = ext2fs_read_bitmaps(fs);
1103         if (retval)
1104                 return;
1105
1106         pctx.str = *cpp;
1107         if (!fix_problem(ctx, PR_0_MOVE_JOURNAL, &pctx))
1108                 return;
1109
1110         /*
1111          * OK, we've done all the checks, let's actually move the
1112          * journal inode.  Errors at this point mean we need to force
1113          * an ext2 filesystem check.
1114          */
1115         if ((retval = ext2fs_unlink(fs, EXT2_ROOT_INO, *cpp, ino, 0)) != 0)
1116                 goto err_out;
1117         if ((retval = ext2fs_write_inode(fs, EXT2_JOURNAL_INO, &inode)) != 0)
1118                 goto err_out;
1119         sb->s_journal_inum = EXT2_JOURNAL_INO;
1120         ext2fs_mark_super_dirty(fs);
1121         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
1122         inode.i_links_count = 0;
1123         inode.i_dtime = ctx->now;
1124         if ((retval = ext2fs_write_inode(fs, ino, &inode)) != 0)
1125                 goto err_out;
1126
1127         group = ext2fs_group_of_ino(fs, ino);
1128         ext2fs_unmark_inode_bitmap2(fs->inode_map, ino);
1129         ext2fs_mark_ib_dirty(fs);
1130         ext2fs_bg_free_inodes_count_set(fs, group, ext2fs_bg_free_inodes_count(fs, group) + 1);
1131         ext2fs_group_desc_csum_set(fs, group);
1132         fs->super->s_free_inodes_count++;
1133         return;
1134
1135 err_out:
1136         pctx.errcode = retval;
1137         fix_problem(ctx, PR_0_ERR_MOVE_JOURNAL, &pctx);
1138         fs->super->s_state &= ~EXT2_VALID_FS;
1139         ext2fs_mark_super_dirty(fs);
1140         return;
1141 }
1142
1143 /*
1144  * This function makes sure the superblock hint for the external
1145  * journal is correct.
1146  */
1147 int e2fsck_fix_ext3_journal_hint(e2fsck_t ctx)
1148 {
1149         struct ext2_super_block *sb = ctx->fs->super;
1150         struct problem_context pctx;
1151         char uuid[37], *journal_name;
1152         struct stat st;
1153
1154         if (!ext2fs_has_feature_journal(sb) ||
1155             uuid_is_null(sb->s_journal_uuid))
1156                 return 0;
1157
1158         uuid_unparse(sb->s_journal_uuid, uuid);
1159         journal_name = blkid_get_devname(ctx->blkid, "UUID", uuid);
1160         if (!journal_name)
1161                 return 0;
1162
1163         if (stat(journal_name, &st) < 0) {
1164                 free(journal_name);
1165                 return 0;
1166         }
1167
1168         if (st.st_rdev != sb->s_journal_dev) {
1169                 clear_problem_context(&pctx);
1170                 pctx.num = st.st_rdev;
1171                 if (fix_problem(ctx, PR_0_EXTERNAL_JOURNAL_HINT, &pctx)) {
1172                         sb->s_journal_dev = st.st_rdev;
1173                         ext2fs_mark_super_dirty(ctx->fs);
1174                 }
1175         }
1176
1177         free(journal_name);
1178         return 0;
1179 }