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 -1 * ((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                     ret;
 293         int                     ext_journal = 0;
 294         int                     tried_backup_jnl = 0;
 295
 296         clear_problem_context(&pctx);
 297
 298         journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal");
 299         if (!journal) {
 300                 return EXT2_ET_NO_MEMORY;
 301         }
 302
 303         dev_fs = e2fsck_allocate_memory(ctx, 2*sizeof(struct kdev_s), "kdev");
 304         if (!dev_fs) {
 305                 retval = EXT2_ET_NO_MEMORY;
 306                 goto errout;
 307         }
 308         dev_journal = dev_fs+1;
 309
 310         dev_fs->k_ctx = dev_journal->k_ctx = ctx;
 311         dev_fs->k_dev = K_DEV_FS;
 312         dev_journal->k_dev = K_DEV_JOURNAL;
 313
 314         journal->j_dev = dev_journal;
 315         journal->j_fs_dev = dev_fs;
 316         journal->j_inode = NULL;
 317         journal->j_blocksize = ctx->fs->blocksize;
 318
 319         if (uuid_is_null(sb->s_journal_uuid)) {
 320                 if (!sb->s_journal_inum) {
 321                         retval = EXT2_ET_BAD_INODE_NUM;
 322                         goto errout;
 323                 }
 324                 j_inode = e2fsck_allocate_memory(ctx, sizeof(*j_inode),
 325                                                  "journal inode");
 326                 if (!j_inode) {
 327                         retval = EXT2_ET_NO_MEMORY;
 328                         goto errout;
 329                 }
 330
 331                 j_inode->i_ctx = ctx;
 332                 j_inode->i_ino = sb->s_journal_inum;
 333
 334                 if ((retval = ext2fs_read_inode(ctx->fs,
 335                                                 sb->s_journal_inum,
 336                                                 &j_inode->i_ext2))) {
 337                 try_backup_journal:
 338                         if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS ||
 339                             tried_backup_jnl)
 340                                 goto errout;
 341                         memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode));
 342                         memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks,
 343                                EXT2_N_BLOCKS*4);
 344                         j_inode->i_ext2.i_size_high = sb->s_jnl_blocks[15];
 345                         j_inode->i_ext2.i_size = sb->s_jnl_blocks[16];
 346                         j_inode->i_ext2.i_links_count = 1;
 347                         j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600;
 348                         e2fsck_use_inode_shortcuts(ctx, 1);
 349                         ctx->stashed_ino = j_inode->i_ino;
 350                         ctx->stashed_inode = &j_inode->i_ext2;
 351                         tried_backup_jnl++;
 352                 }
 353                 if (!j_inode->i_ext2.i_links_count ||
 354                     !LINUX_S_ISREG(j_inode->i_ext2.i_mode)) {
 355                         retval = EXT2_ET_NO_JOURNAL;
 356                         goto try_backup_journal;
 357                 }
 358                 if (EXT2_I_SIZE(&j_inode->i_ext2) / journal->j_blocksize <
 359                     JFS_MIN_JOURNAL_BLOCKS) {
 360                         retval = EXT2_ET_JOURNAL_TOO_SMALL;
 361                         goto try_backup_journal;
 362                 }
 363                 pb.last_block = -1;
 364                 retval = ext2fs_block_iterate3(ctx->fs, j_inode->i_ino,
 365                                                BLOCK_FLAG_HOLE, 0,
 366                                                process_journal_block, &pb);
 367                 if ((pb.last_block + 1) * ctx->fs->blocksize <
 368                     (int) EXT2_I_SIZE(&j_inode->i_ext2)) {
 369                         retval = EXT2_ET_JOURNAL_TOO_SMALL;
 370                         goto try_backup_journal;
 371                 }
 372                 if (tried_backup_jnl && !(ctx->options & E2F_OPT_READONLY)) {
 373                         retval = ext2fs_write_inode(ctx->fs, sb->s_journal_inum,
 374                                                     &j_inode->i_ext2);
 375                         if (retval)
 376                                 goto errout;
 377                 }
 378
 379                 journal->j_maxlen = EXT2_I_SIZE(&j_inode->i_ext2) /
 380                         journal->j_blocksize;
 381
 382 #ifdef USE_INODE_IO
 383                 retval = ext2fs_inode_io_intern2(ctx->fs, sb->s_journal_inum,
 384                                                  &j_inode->i_ext2,
 385                                                  &journal_name);
 386                 if (retval)
 387                         goto errout;
 388
 389                 io_ptr = inode_io_manager;
 390 #else
 391                 journal->j_inode = j_inode;
 392                 ctx->journal_io = ctx->fs->io;
 393                 if ((ret = journal_bmap(journal, 0, &start)) != 0) {
 394                         retval = (errcode_t) (-1 * ret);
 395                         goto errout;
 396                 }
 397 #endif
 398         } else {
 399                 ext_journal = 1;
 400                 if (!ctx->journal_name) {
 401                         char uuid[37];
 402
 403                         uuid_unparse(sb->s_journal_uuid, uuid);
 404                         ctx->journal_name = blkid_get_devname(ctx->blkid,
 405                                                               "UUID", uuid);
 406                         if (!ctx->journal_name)
 407                                 ctx->journal_name = blkid_devno_to_devname(sb->s_journal_dev);
 408                 }
 409                 journal_name = ctx->journal_name;
 410
 411                 if (!journal_name) {
 412                         fix_problem(ctx, PR_0_CANT_FIND_JOURNAL, &pctx);
 413                         retval = EXT2_ET_LOAD_EXT_JOURNAL;
 414                         goto errout;
 415                 }
 416
 417                 jfs_debug(1, "Using journal file %s\n", journal_name);
 418                 io_ptr = unix_io_manager;
 419         }
 420
 421 #if 0
 422         test_io_backing_manager = io_ptr;
 423         io_ptr = test_io_manager;
 424 #endif
 425 #ifndef USE_INODE_IO
 426         if (ext_journal)
 427 #endif
 428         {
 429                 int flags = IO_FLAG_RW;
 430                 if (!(ctx->mount_flags & EXT2_MF_ISROOT &&
 431                       ctx->mount_flags & EXT2_MF_READONLY))
 432                         flags |= IO_FLAG_EXCLUSIVE;
 433                 if ((ctx->mount_flags & EXT2_MF_READONLY) &&
 434                     (ctx->options & E2F_OPT_FORCE))
 435                         flags &= ~IO_FLAG_EXCLUSIVE;
 436
 437
 438                 retval = io_ptr->open(journal_name, flags,
 439                                       &ctx->journal_io);
 440         }
 441         if (retval)
 442                 goto errout;
 443
 444         io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize);
 445
 446         if (ext_journal) {
 447                 blk64_t maxlen;
 448
 449                 start = ext2fs_journal_sb_start(ctx->fs->blocksize) - 1;
 450                 bh = getblk(dev_journal, start, ctx->fs->blocksize);
 451                 if (!bh) {
 452                         retval = EXT2_ET_NO_MEMORY;
 453                         goto errout;
 454                 }
 455                 ll_rw_block(READ, 1, &bh);
 456                 if ((retval = bh->b_err) != 0) {
 457                         brelse(bh);
 458                         goto errout;
 459                 }
 460                 memcpy(&jsuper, start ? bh->b_data :  bh->b_data + SUPERBLOCK_OFFSET,
 461                        sizeof(jsuper));
 462 #ifdef WORDS_BIGENDIAN
 463                 if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
 464                         ext2fs_swap_super(&jsuper);
 465 #endif
 466                 if (jsuper.s_magic != EXT2_SUPER_MAGIC ||
 467                     !ext2fs_has_feature_journal_dev(&jsuper)) {
 468                         fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx);
 469                         retval = EXT2_ET_LOAD_EXT_JOURNAL;
 470                         brelse(bh);
 471                         goto errout;
 472                 }
 473                 /* Make sure the journal UUID is correct */
 474                 if (memcmp(jsuper.s_uuid, ctx->fs->super->s_journal_uuid,
 475                            sizeof(jsuper.s_uuid))) {
 476                         fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx);
 477                         retval = EXT2_ET_LOAD_EXT_JOURNAL;
 478                         brelse(bh);
 479                         goto errout;
 480                 }
 481
 482                 /* Check the superblock checksum */
 483                 if (ext2fs_has_feature_metadata_csum(&jsuper)) {
 484                         struct struct_ext2_filsys fsx;
 485                         struct ext2_super_block superx;
 486                         void *p;
 487
 488                         p = start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET;
 489                         memcpy(&fsx, ctx->fs, sizeof(fsx));
 490                         memcpy(&superx, ctx->fs->super, sizeof(superx));
 491                         fsx.super = &superx;
 492                         ext2fs_set_feature_metadata_csum(fsx.super);
 493                         if (!ext2fs_superblock_csum_verify(&fsx, p) &&
 494                             fix_problem(ctx, PR_0_EXT_JOURNAL_SUPER_CSUM_INVALID,
 495                                         &pctx)) {
 496                                 ext2fs_superblock_csum_set(&fsx, p);
 497                                 mark_buffer_dirty(bh);
 498                         }
 499                 }
 500                 brelse(bh);
 501
 502                 maxlen = ext2fs_blocks_count(&jsuper);
 503                 journal->j_maxlen = (maxlen < 1ULL << 32) ? maxlen : (1ULL << 32) - 1;
 504                 start++;
 505         }
 506
 507         if (!(bh = getblk(dev_journal, start, journal->j_blocksize))) {
 508                 retval = EXT2_ET_NO_MEMORY;
 509                 goto errout;
 510         }
 511
 512         journal->j_sb_buffer = bh;
 513         journal->j_superblock = (journal_superblock_t *)bh->b_data;
 514
 515 #ifdef USE_INODE_IO
 516         if (j_inode)
 517                 ext2fs_free_mem(&j_inode);
 518 #endif
 519
 520         *ret_journal = journal;
 521         e2fsck_use_inode_shortcuts(ctx, 0);
 522         return 0;
 523
 524 errout:
 525         e2fsck_use_inode_shortcuts(ctx, 0);
 526         if (dev_fs)
 527                 ext2fs_free_mem(&dev_fs);
 528         if (j_inode)
 529                 ext2fs_free_mem(&j_inode);
 530         if (journal)
 531                 ext2fs_free_mem(&journal);
 532         return retval;
 533 }
 534
 535 static errcode_t e2fsck_journal_fix_bad_inode(e2fsck_t ctx,
 536                                               struct problem_context *pctx)
 537 {
 538         struct ext2_super_block *sb = ctx->fs->super;
 539         int recover = ext2fs_has_feature_journal_needs_recovery(ctx->fs->super);
 540         int has_journal = ext2fs_has_feature_journal(ctx->fs->super);
 541
 542         if (has_journal || sb->s_journal_inum) {
 543                 /* The journal inode is bogus, remove and force full fsck */
 544                 pctx->ino = sb->s_journal_inum;
 545                 if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) {
 546                         if (has_journal && sb->s_journal_inum)
 547                                 printf("*** journal has been deleted ***\n\n");
 548                         ext2fs_clear_feature_journal(sb);
 549                         sb->s_journal_inum = 0;
 550                         memset(sb->s_jnl_blocks, 0, sizeof(sb->s_jnl_blocks));
 551                         ctx->flags |= E2F_FLAG_JOURNAL_INODE;
 552                         ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 553                         e2fsck_clear_recover(ctx, 1);
 554                         return 0;
 555                 }
 556                 return EXT2_ET_CORRUPT_JOURNAL_SB;
 557         } else if (recover) {
 558                 if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) {
 559                         e2fsck_clear_recover(ctx, 1);
 560                         return 0;
 561                 }
 562                 return EXT2_ET_UNSUPP_FEATURE;
 563         }
 564         return 0;
 565 }
 566
 567 #define V1_SB_SIZE      0x0024
 568 static void clear_v2_journal_fields(journal_t *journal)
 569 {
 570         e2fsck_t ctx = journal->j_dev->k_ctx;
 571         struct problem_context pctx;
 572
 573         clear_problem_context(&pctx);
 574
 575         if (!fix_problem(ctx, PR_0_CLEAR_V2_JOURNAL, &pctx))
 576                 return;
 577
 578         ctx->flags |= E2F_FLAG_PROBLEMS_FIXED;
 579         memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0,
 580                ctx->fs->blocksize-V1_SB_SIZE);
 581         mark_buffer_dirty(journal->j_sb_buffer);
 582 }
 583
 584
 585 static errcode_t e2fsck_journal_load(journal_t *journal)
 586 {
 587         e2fsck_t ctx = journal->j_dev->k_ctx;
 588         journal_superblock_t *jsb;
 589         struct buffer_head *jbh = journal->j_sb_buffer;
 590         struct problem_context pctx;
 591
 592         clear_problem_context(&pctx);
 593
 594         ll_rw_block(READ, 1, &jbh);
 595         if (jbh->b_err) {
 596                 com_err(ctx->device_name, jbh->b_err, "%s",
 597                         _("reading journal superblock\n"));
 598                 return jbh->b_err;
 599         }
 600
 601         jsb = journal->j_superblock;
 602         /* If we don't even have JFS_MAGIC, we probably have a wrong inode */
 603         if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER))
 604                 return e2fsck_journal_fix_bad_inode(ctx, &pctx);
 605
 606         switch (ntohl(jsb->s_header.h_blocktype)) {
 607         case JFS_SUPERBLOCK_V1:
 608                 journal->j_format_version = 1;
 609                 if (jsb->s_feature_compat ||
 610                     jsb->s_feature_incompat ||
 611                     jsb->s_feature_ro_compat ||
 612                     jsb->s_nr_users)
 613                         clear_v2_journal_fields(journal);
 614                 break;
 615
 616         case JFS_SUPERBLOCK_V2:
 617                 journal->j_format_version = 2;
 618                 if (ntohl(jsb->s_nr_users) > 1 &&
 619                     uuid_is_null(ctx->fs->super->s_journal_uuid))
 620                         clear_v2_journal_fields(journal);
 621                 if (ntohl(jsb->s_nr_users) > 1) {
 622                         fix_problem(ctx, PR_0_JOURNAL_UNSUPP_MULTIFS, &pctx);
 623                         return EXT2_ET_JOURNAL_UNSUPP_VERSION;
 624                 }
 625                 break;
 626
 627         /*
 628          * These should never appear in a journal super block, so if
 629          * they do, the journal is badly corrupted.
 630          */
 631         case JFS_DESCRIPTOR_BLOCK:
 632         case JFS_COMMIT_BLOCK:
 633         case JFS_REVOKE_BLOCK:
 634                 return EXT2_ET_CORRUPT_JOURNAL_SB;
 635
 636         /* If we don't understand the superblock major type, but there
 637          * is a magic number, then it is likely to be a new format we
 638          * just don't understand, so leave it alone. */
 639         default:
 640                 return EXT2_ET_JOURNAL_UNSUPP_VERSION;
 641         }
 642
 643         if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES))
 644                 return EXT2_ET_UNSUPP_FEATURE;
 645
 646         if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES))
 647                 return EXT2_ET_RO_UNSUPP_FEATURE;
 648
 649         /* Checksum v1-3 are mutually exclusive features. */
 650         if (jfs_has_feature_csum2(journal) && jfs_has_feature_csum3(journal))
 651                 return EXT2_ET_CORRUPT_JOURNAL_SB;
 652
 653         if (journal_has_csum_v2or3(journal) &&
 654             jfs_has_feature_checksum(journal))
 655                 return EXT2_ET_CORRUPT_JOURNAL_SB;
 656
 657         if (!e2fsck_journal_verify_csum_type(journal, jsb) ||
 658             !e2fsck_journal_sb_csum_verify(journal, jsb))
 659                 return EXT2_ET_CORRUPT_JOURNAL_SB;
 660
 661         if (journal_has_csum_v2or3(journal))
 662                 journal->j_csum_seed = jbd2_chksum(journal, ~0, jsb->s_uuid,
 663                                                    sizeof(jsb->s_uuid));
 664
 665         /* We have now checked whether we know enough about the journal
 666          * format to be able to proceed safely, so any other checks that
 667          * fail we should attempt to recover from. */
 668         if (jsb->s_blocksize != htonl(journal->j_blocksize)) {
 669                 com_err(ctx->program_name, EXT2_ET_CORRUPT_JOURNAL_SB,
 670                         _("%s: no valid journal superblock found\n"),
 671                         ctx->device_name);
 672                 return EXT2_ET_CORRUPT_JOURNAL_SB;
 673         }
 674
 675         if (ntohl(jsb->s_maxlen) < journal->j_maxlen)
 676                 journal->j_maxlen = ntohl(jsb->s_maxlen);
 677         else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) {
 678                 com_err(ctx->program_name, EXT2_ET_CORRUPT_JOURNAL_SB,
 679                         _("%s: journal too short\n"),
 680                         ctx->device_name);
 681                 return EXT2_ET_CORRUPT_JOURNAL_SB;
 682         }
 683
 684         journal->j_tail_sequence = ntohl(jsb->s_sequence);
 685         journal->j_transaction_sequence = journal->j_tail_sequence;
 686         journal->j_tail = ntohl(jsb->s_start);
 687         journal->j_first = ntohl(jsb->s_first);
 688         journal->j_last = ntohl(jsb->s_maxlen);
 689
 690         return 0;
 691 }
 692
 693 static void e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb,
 694                                        journal_t *journal)
 695 {
 696         char *p;
 697         union {
 698                 uuid_t uuid;
 699                 __u32 val[4];
 700         } u;
 701         __u32 new_seq = 0;
 702         int i;
 703
 704         /* Leave a valid existing V1 superblock signature alone.
 705          * Anything unrecognisable we overwrite with a new V2
 706          * signature. */
 707
 708         if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER) ||
 709             jsb->s_header.h_blocktype != htonl(JFS_SUPERBLOCK_V1)) {
 710                 jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER);
 711                 jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2);
 712         }
 713
 714         /* Zero out everything else beyond the superblock header */
 715
 716         p = ((char *) jsb) + sizeof(journal_header_t);
 717         memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t));
 718
 719         jsb->s_blocksize = htonl(ctx->fs->blocksize);
 720         jsb->s_maxlen = htonl(journal->j_maxlen);
 721         jsb->s_first = htonl(1);
 722
 723         /* Initialize the journal sequence number so that there is "no"
 724          * chance we will find old "valid" transactions in the journal.
 725          * This avoids the need to zero the whole journal (slow to do,
 726          * and risky when we are just recovering the filesystem).
 727          */
 728         uuid_generate(u.uuid);
 729         for (i = 0; i < 4; i ++)
 730                 new_seq ^= u.val[i];
 731         jsb->s_sequence = htonl(new_seq);
 732         e2fsck_journal_sb_csum_set(journal, jsb);
 733
 734         mark_buffer_dirty(journal->j_sb_buffer);
 735         ll_rw_block(WRITE, 1, &journal->j_sb_buffer);
 736 }
 737
 738 static errcode_t e2fsck_journal_fix_corrupt_super(e2fsck_t ctx,
 739                                                   journal_t *journal,
 740                                                   struct problem_context *pctx)
 741 {
 742         struct ext2_super_block *sb = ctx->fs->super;
 743         int recover = ext2fs_has_feature_journal_needs_recovery(ctx->fs->super);
 744
 745         if (ext2fs_has_feature_journal(sb)) {
 746                 if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) {
 747                         e2fsck_journal_reset_super(ctx, journal->j_superblock,
 748                                                    journal);
 749                         journal->j_transaction_sequence = 1;
 750                         e2fsck_clear_recover(ctx, recover);
 751                         return 0;
 752                 }
 753                 return EXT2_ET_CORRUPT_JOURNAL_SB;
 754         } else if (e2fsck_journal_fix_bad_inode(ctx, pctx))
 755                 return EXT2_ET_CORRUPT_JOURNAL_SB;
 756
 757         return 0;
 758 }
 759
 760 static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal,
 761                                    int reset, int drop)
 762 {
 763         journal_superblock_t *jsb;
 764
 765         if (drop)
 766                 mark_buffer_clean(journal->j_sb_buffer);
 767         else if (!(ctx->options & E2F_OPT_READONLY)) {
 768                 jsb = journal->j_superblock;
 769                 jsb->s_sequence = htonl(journal->j_tail_sequence);
 770                 if (reset)
 771                         jsb->s_start = 0; /* this marks the journal as empty */
 772                 e2fsck_journal_sb_csum_set(journal, jsb);
 773                 mark_buffer_dirty(journal->j_sb_buffer);
 774         }
 775         brelse(journal->j_sb_buffer);
 776
 777         if (ctx->journal_io) {
 778                 if (ctx->fs && ctx->fs->io != ctx->journal_io)
 779                         io_channel_close(ctx->journal_io);
 780                 ctx->journal_io = 0;
 781         }
 782
 783 #ifndef USE_INODE_IO
 784         if (journal->j_inode)
 785                 ext2fs_free_mem(&journal->j_inode);
 786 #endif
 787         if (journal->j_fs_dev)
 788                 ext2fs_free_mem(&journal->j_fs_dev);
 789         ext2fs_free_mem(&journal);
 790 }
 791
 792 /*
 793  * This function makes sure that the superblock fields regarding the
 794  * journal are consistent.
 795  */
 796 errcode_t e2fsck_check_ext3_journal(e2fsck_t ctx)
 797 {
 798         struct ext2_super_block *sb = ctx->fs->super;
 799         journal_t *journal;
 800         int recover = ext2fs_has_feature_journal_needs_recovery(ctx->fs->super);
 801         struct problem_context pctx;
 802         problem_t problem;
 803         int reset = 0, force_fsck = 0;
 804         errcode_t retval;
 805
 806         /* If we don't have any journal features, don't do anything more */
 807         if (!ext2fs_has_feature_journal(sb) &&
 808             !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 &&
 809             uuid_is_null(sb->s_journal_uuid))
 810                 return 0;
 811
 812         clear_problem_context(&pctx);
 813         pctx.num = sb->s_journal_inum;
 814
 815         retval = e2fsck_get_journal(ctx, &journal);
 816         if (retval) {
 817                 if ((retval == EXT2_ET_BAD_INODE_NUM) ||
 818                     (retval == EXT2_ET_BAD_BLOCK_NUM) ||
 819                     (retval == EXT2_ET_JOURNAL_TOO_SMALL) ||
 820                     (retval == EXT2_ET_NO_JOURNAL))
 821                         return e2fsck_journal_fix_bad_inode(ctx, &pctx);
 822                 return retval;
 823         }
 824
 825         retval = e2fsck_journal_load(journal);
 826         if (retval) {
 827                 if ((retval == EXT2_ET_CORRUPT_JOURNAL_SB) ||
 828                     ((retval == EXT2_ET_UNSUPP_FEATURE) &&
 829                     (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_INCOMPAT,
 830                                   &pctx))) ||
 831                     ((retval == EXT2_ET_RO_UNSUPP_FEATURE) &&
 832                     (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_ROCOMPAT,
 833                                   &pctx))) ||
 834                     ((retval == EXT2_ET_JOURNAL_UNSUPP_VERSION) &&
 835                     (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_VERSION, &pctx))))
 836                         retval = e2fsck_journal_fix_corrupt_super(ctx, journal,
 837                                                                   &pctx);
 838                 e2fsck_journal_release(ctx, journal, 0, 1);
 839                 return retval;
 840         }
 841
 842         /*
 843          * We want to make the flags consistent here.  We will not leave with
 844          * needs_recovery set but has_journal clear.  We can't get in a loop
 845          * with -y, -n, or -p, only if a user isn't making up their mind.
 846          */
 847 no_has_journal:
 848         if (!ext2fs_has_feature_journal(sb)) {
 849                 recover = ext2fs_has_feature_journal_needs_recovery(sb);
 850                 if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) {
 851                         if (recover &&
 852                             !fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx))
 853                                 goto no_has_journal;
 854                         /*
 855                          * Need a full fsck if we are releasing a
 856                          * journal stored on a reserved inode.
 857                          */
 858                         force_fsck = recover ||
 859                                 (sb->s_journal_inum < EXT2_FIRST_INODE(sb));
 860                         /* Clear all of the journal fields */
 861                         sb->s_journal_inum = 0;
 862                         sb->s_journal_dev = 0;
 863                         memset(sb->s_journal_uuid, 0,
 864                                sizeof(sb->s_journal_uuid));
 865                         e2fsck_clear_recover(ctx, force_fsck);
 866                 } else if (!(ctx->options & E2F_OPT_READONLY)) {
 867                         ext2fs_set_feature_journal(sb);
 868                         ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 869                         ext2fs_mark_super_dirty(ctx->fs);
 870                 }
 871         }
 872
 873         if (ext2fs_has_feature_journal(sb) &&
 874             !ext2fs_has_feature_journal_needs_recovery(sb) &&
 875             journal->j_superblock->s_start != 0) {
 876                 /* Print status information */
 877                 fix_problem(ctx, PR_0_JOURNAL_RECOVERY_CLEAR, &pctx);
 878                 if (ctx->superblock)
 879                         problem = PR_0_JOURNAL_RUN_DEFAULT;
 880                 else
 881                         problem = PR_0_JOURNAL_RUN;
 882                 if (fix_problem(ctx, problem, &pctx)) {
 883                         ctx->options |= E2F_OPT_FORCE;
 884                         ext2fs_set_feature_journal_needs_recovery(sb);
 885                         ext2fs_mark_super_dirty(ctx->fs);
 886                 } else if (fix_problem(ctx,
 887                                        PR_0_JOURNAL_RESET_JOURNAL, &pctx)) {
 888                         reset = 1;
 889                         sb->s_state &= ~EXT2_VALID_FS;
 890                         ext2fs_mark_super_dirty(ctx->fs);
 891                 }
 892                 /*
 893                  * If the user answers no to the above question, we
 894                  * ignore the fact that journal apparently has data;
 895                  * accidentally replaying over valid data would be far
 896                  * worse than skipping a questionable recovery.
 897                  *
 898                  * XXX should we abort with a fatal error here?  What
 899                  * will the ext3 kernel code do if a filesystem with
 900                  * !NEEDS_RECOVERY but with a non-zero
 901                  * journal->j_superblock->s_start is mounted?
 902                  */
 903         }
 904
 905         /*
 906          * If we don't need to do replay the journal, check to see if
 907          * the journal's errno is set; if so, we need to mark the file
 908          * system as being corrupt and clear the journal's s_errno.
 909          */
 910         if (!ext2fs_has_feature_journal_needs_recovery(sb) &&
 911             journal->j_superblock->s_errno) {
 912                 ctx->fs->super->s_state |= EXT2_ERROR_FS;
 913                 ext2fs_mark_super_dirty(ctx->fs);
 914                 journal->j_superblock->s_errno = 0;
 915                 e2fsck_journal_sb_csum_set(journal, journal->j_superblock);
 916                 mark_buffer_dirty(journal->j_sb_buffer);
 917         }
 918
 919         e2fsck_journal_release(ctx, journal, reset, 0);
 920         return retval;
 921 }
 922
 923 static errcode_t recover_ext3_journal(e2fsck_t ctx)
 924 {
 925         struct problem_context  pctx;
 926         journal_t *journal;
 927         errcode_t retval;
 928
 929         clear_problem_context(&pctx);
 930
 931         journal_init_revoke_caches();
 932         retval = e2fsck_get_journal(ctx, &journal);
 933         if (retval)
 934                 return retval;
 935
 936         retval = e2fsck_journal_load(journal);
 937         if (retval)
 938                 goto errout;
 939
 940         retval = journal_init_revoke(journal, 1024);
 941         if (retval)
 942                 goto errout;
 943
 944         retval = -journal_recover(journal);
 945         if (retval)
 946                 goto errout;
 947
 948         if (journal->j_failed_commit) {
 949                 pctx.ino = journal->j_failed_commit;
 950                 fix_problem(ctx, PR_0_JNL_TXN_CORRUPT, &pctx);
 951                 journal->j_superblock->s_errno = -EINVAL;
 952                 mark_buffer_dirty(journal->j_sb_buffer);
 953         }
 954
 955         journal->j_tail_sequence = journal->j_transaction_sequence;
 956
 957 errout:
 958         journal_destroy_revoke(journal);
 959         journal_destroy_revoke_caches();
 960         e2fsck_journal_release(ctx, journal, 1, 0);
 961         return retval;
 962 }
 963
 964 errcode_t e2fsck_run_ext3_journal(e2fsck_t ctx)
 965 {
 966         io_manager io_ptr = ctx->fs->io->manager;
 967         int blocksize = ctx->fs->blocksize;
 968         errcode_t       retval, recover_retval;
 969         io_stats        stats = 0;
 970         unsigned long long kbytes_written = 0;
 971
 972         printf(_("%s: recovering journal\n"), ctx->device_name);
 973         if (ctx->options & E2F_OPT_READONLY) {
 974                 printf(_("%s: won't do journal recovery while read-only\n"),
 975                        ctx->device_name);
 976                 return EXT2_ET_FILE_RO;
 977         }
 978
 979         if (ctx->fs->flags & EXT2_FLAG_DIRTY)
 980                 ext2fs_flush(ctx->fs);  /* Force out any modifications */
 981
 982         recover_retval = recover_ext3_journal(ctx);
 983
 984         /*
 985          * Reload the filesystem context to get up-to-date data from disk
 986          * because journal recovery will change the filesystem under us.
 987          */
 988         if (ctx->fs->super->s_kbytes_written &&
 989             ctx->fs->io->manager->get_stats)
 990                 ctx->fs->io->manager->get_stats(ctx->fs->io, &stats);
 991         if (stats && stats->bytes_written)
 992                 kbytes_written = stats->bytes_written >> 10;
 993
 994         ext2fs_mmp_stop(ctx->fs);
 995         ext2fs_free(ctx->fs);
 996         retval = ext2fs_open(ctx->filesystem_name, ctx->openfs_flags,
 997                              ctx->superblock, blocksize, io_ptr,
 998                              &ctx->fs);
 999         if (retval) {
1000                 com_err(ctx->program_name, retval,
1001                         _("while trying to re-open %s"),
1002                         ctx->device_name);
1003                 fatal_error(ctx, 0);
1004         }
1005         ctx->fs->priv_data = ctx;
1006         ctx->fs->now = ctx->now;
1007         ctx->fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
1008         ctx->fs->super->s_kbytes_written += kbytes_written;
1009
1010         /* Set the superblock flags */
1011         e2fsck_clear_recover(ctx, recover_retval != 0);
1012
1013         /*
1014          * Do one last sanity check, and propagate journal->s_errno to
1015          * the EXT2_ERROR_FS flag in the fs superblock if needed.
1016          */
1017         retval = e2fsck_check_ext3_journal(ctx);
1018         return retval ? retval : recover_retval;
1019 }
1020
1021 /*
1022  * This function will move the journal inode from a visible file in
1023  * the filesystem directory hierarchy to the reserved inode if necessary.
1024  */
1025 static const char * const journal_names[] = {
1026         ".journal", "journal", ".journal.dat", "journal.dat", 0 };
1027
1028 void e2fsck_move_ext3_journal(e2fsck_t ctx)
1029 {
1030         struct ext2_super_block *sb = ctx->fs->super;
1031         struct problem_context  pctx;
1032         struct ext2_inode       inode;
1033         ext2_filsys             fs = ctx->fs;
1034         ext2_ino_t              ino;
1035         errcode_t               retval;
1036         const char * const *    cpp;
1037         dgrp_t                  group;
1038         int                     mount_flags;
1039
1040         clear_problem_context(&pctx);
1041
1042         /*
1043          * If the filesystem is opened read-only, or there is no
1044          * journal, then do nothing.
1045          */
1046         if ((ctx->options & E2F_OPT_READONLY) ||
1047             (sb->s_journal_inum == 0) ||
1048             !ext2fs_has_feature_journal(sb))
1049                 return;
1050
1051         /*
1052          * Read in the journal inode
1053          */
1054         if (ext2fs_read_inode(fs, sb->s_journal_inum, &inode) != 0)
1055                 return;
1056
1057         /*
1058          * If it's necessary to backup the journal inode, do so.
1059          */
1060         if ((sb->s_jnl_backup_type == 0) ||
1061             ((sb->s_jnl_backup_type == EXT3_JNL_BACKUP_BLOCKS) &&
1062              memcmp(inode.i_block, sb->s_jnl_blocks, EXT2_N_BLOCKS*4))) {
1063                 if (fix_problem(ctx, PR_0_BACKUP_JNL, &pctx)) {
1064                         memcpy(sb->s_jnl_blocks, inode.i_block,
1065                                EXT2_N_BLOCKS*4);
1066                         sb->s_jnl_blocks[15] = inode.i_size_high;
1067                         sb->s_jnl_blocks[16] = inode.i_size;
1068                         sb->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
1069                         ext2fs_mark_super_dirty(fs);
1070                         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
1071                 }
1072         }
1073
1074         /*
1075          * If the journal is already the hidden inode, then do nothing
1076          */
1077         if (sb->s_journal_inum == EXT2_JOURNAL_INO)
1078                 return;
1079
1080         /*
1081          * The journal inode had better have only one link and not be readable.
1082          */
1083         if (inode.i_links_count != 1)
1084                 return;
1085
1086         /*
1087          * If the filesystem is mounted, or we can't tell whether
1088          * or not it's mounted, do nothing.
1089          */
1090         retval = ext2fs_check_if_mounted(ctx->filesystem_name, &mount_flags);
1091         if (retval || (mount_flags & EXT2_MF_MOUNTED))
1092                 return;
1093
1094         /*
1095          * If we can't find the name of the journal inode, then do
1096          * nothing.
1097          */
1098         for (cpp = journal_names; *cpp; cpp++) {
1099                 retval = ext2fs_lookup(fs, EXT2_ROOT_INO, *cpp,
1100                                        strlen(*cpp), 0, &ino);
1101                 if ((retval == 0) && (ino == sb->s_journal_inum))
1102                         break;
1103         }
1104         if (*cpp == 0)
1105                 return;
1106
1107         /* We need the inode bitmap to be loaded */
1108         retval = ext2fs_read_bitmaps(fs);
1109         if (retval)
1110                 return;
1111
1112         pctx.str = *cpp;
1113         if (!fix_problem(ctx, PR_0_MOVE_JOURNAL, &pctx))
1114                 return;
1115
1116         /*
1117          * OK, we've done all the checks, let's actually move the
1118          * journal inode.  Errors at this point mean we need to force
1119          * an ext2 filesystem check.
1120          */
1121         if ((retval = ext2fs_unlink(fs, EXT2_ROOT_INO, *cpp, ino, 0)) != 0)
1122                 goto err_out;
1123         if ((retval = ext2fs_write_inode(fs, EXT2_JOURNAL_INO, &inode)) != 0)
1124                 goto err_out;
1125         sb->s_journal_inum = EXT2_JOURNAL_INO;
1126         ext2fs_mark_super_dirty(fs);
1127         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
1128         inode.i_links_count = 0;
1129         inode.i_dtime = ctx->now;
1130         if ((retval = ext2fs_write_inode(fs, ino, &inode)) != 0)
1131                 goto err_out;
1132
1133         group = ext2fs_group_of_ino(fs, ino);
1134         ext2fs_unmark_inode_bitmap2(fs->inode_map, ino);
1135         ext2fs_mark_ib_dirty(fs);
1136         ext2fs_bg_free_inodes_count_set(fs, group, ext2fs_bg_free_inodes_count(fs, group) + 1);
1137         ext2fs_group_desc_csum_set(fs, group);
1138         fs->super->s_free_inodes_count++;
1139         return;
1140
1141 err_out:
1142         pctx.errcode = retval;
1143         fix_problem(ctx, PR_0_ERR_MOVE_JOURNAL, &pctx);
1144         fs->super->s_state &= ~EXT2_VALID_FS;
1145         ext2fs_mark_super_dirty(fs);
1146         return;
1147 }
1148
1149 /*
1150  * This function makes sure the superblock hint for the external
1151  * journal is correct.
1152  */
1153 int e2fsck_fix_ext3_journal_hint(e2fsck_t ctx)
1154 {
1155         struct ext2_super_block *sb = ctx->fs->super;
1156         struct problem_context pctx;
1157         char uuid[37], *journal_name;
1158         struct stat st;
1159
1160         if (!ext2fs_has_feature_journal(sb) ||
1161             uuid_is_null(sb->s_journal_uuid))
1162                 return 0;
1163
1164         uuid_unparse(sb->s_journal_uuid, uuid);
1165         journal_name = blkid_get_devname(ctx->blkid, "UUID", uuid);
1166         if (!journal_name)
1167                 return 0;
1168
1169         if (stat(journal_name, &st) < 0) {
1170                 free(journal_name);
1171                 return 0;
1172         }
1173
1174         if (st.st_rdev != sb->s_journal_dev) {
1175                 clear_problem_context(&pctx);
1176                 pctx.num = st.st_rdev;
1177                 if (fix_problem(ctx, PR_0_EXTERNAL_JOURNAL_HINT, &pctx)) {
1178                         sb->s_journal_dev = st.st_rdev;
1179                         ext2fs_mark_super_dirty(ctx->fs);
1180                 }
1181         }
1182
1183         free(journal_name);
1184         return 0;
1185 }