e2fsck/journal.c

   1 /*
   2  * journal.c --- code for handling the "ext3" journal
   3  *
   4  * Copyright (C) 2000 Andreas Dilger
   5  * Copyright (C) 2000 Theodore Ts'o
   6  *
   7  * Parts of the code are based on fs/jfs/journal.c by Stephen C. Tweedie
   8  * Copyright (C) 1999 Red Hat Software
   9  *
  10  * This file may be redistributed under the terms of the
  11  * GNU General Public License version 2 or at your discretion
  12  * any later version.
  13  */
  14
  15 #ifdef HAVE_SYS_MOUNT_H
  16 #include <sys/param.h>
  17 #include <sys/mount.h>
  18 #define MNT_FL (MS_MGC_VAL | MS_RDONLY)
  19 #endif
  20 #ifdef HAVE_SYS_STAT_H
  21 #include <sys/stat.h>
  22 #endif
  23
  24 #define E2FSCK_INCLUDE_INLINE_FUNCS
  25 #include "jfs_user.h"
  26 #include "problem.h"
  27 #include "uuid/uuid.h"
  28
  29 #ifdef CONFIG_JBD_DEBUG         /* Enabled by configure --enable-jfs-debug */
  30 static int bh_count = 0;
  31 #endif
  32
  33 /*
  34  * Define USE_INODE_IO to use the inode_io.c / fileio.c codepaths.
  35  * This creates a larger static binary, and a smaller binary using
  36  * shared libraries.  It's also probably slightly less CPU-efficient,
  37  * which is why it's not on by default.  But, it's a good way of
  38  * testing the functions in inode_io.c and fileio.c.
  39  */
  40 #undef USE_INODE_IO
  41
  42 /* Kernel compatibility functions for handling the journal.  These allow us
  43  * to use the recovery.c file virtually unchanged from the kernel, so we
  44  * don't have to do much to keep kernel and user recovery in sync.
  45  */
  46 int journal_bmap(journal_t *journal, blk_t block, unsigned long *phys)
  47 {
  48 #ifdef USE_INODE_IO
  49         *phys = block;
  50         return 0;
  51 #else
  52         struct inode    *inode = journal->j_inode;
  53         errcode_t       retval;
  54         blk_t           pblk;
  55
  56         if (!inode) {
  57                 *phys = block;
  58                 return 0;
  59         }
  60
  61         retval= ext2fs_bmap(inode->i_ctx->fs, inode->i_ino,
  62                             &inode->i_ext2, NULL, 0, block, &pblk);
  63         *phys = pblk;
  64         return (retval);
  65 #endif
  66 }
  67
  68 struct buffer_head *getblk(kdev_t kdev, blk_t blocknr, int blocksize)
  69 {
  70         struct buffer_head *bh;
  71         int bufsize = sizeof(*bh) + kdev->k_ctx->fs->blocksize -
  72                 sizeof(bh->b_data);
  73
  74         bh = e2fsck_allocate_memory(kdev->k_ctx, bufsize, "block buffer");
  75         if (!bh)
  76                 return NULL;
  77
  78 #ifdef CONFIG_JBD_DEBUG
  79         if (journal_enable_debug >= 3)
  80                 bh_count++;
  81 #endif
  82         jfs_debug(4, "getblk for block %lu (%d bytes)(total %d)\n",
  83                   (unsigned long) blocknr, blocksize, bh_count);
  84
  85         bh->b_ctx = kdev->k_ctx;
  86         if (kdev->k_dev == K_DEV_FS)
  87                 bh->b_io = kdev->k_ctx->fs->io;
  88         else
  89                 bh->b_io = kdev->k_ctx->journal_io;
  90         bh->b_size = blocksize;
  91         bh->b_blocknr = blocknr;
  92
  93         return bh;
  94 }
  95
  96 void sync_blockdev(kdev_t kdev)
  97 {
  98         io_channel      io;
  99
 100         if (kdev->k_dev == K_DEV_FS)
 101                 io = kdev->k_ctx->fs->io;
 102         else
 103                 io = kdev->k_ctx->journal_io;
 104
 105         io_channel_flush(io);
 106 }
 107
 108 void ll_rw_block(int rw, int nr, struct buffer_head *bhp[])
 109 {
 110         int retval;
 111         struct buffer_head *bh;
 112
 113         for (; nr > 0; --nr) {
 114                 bh = *bhp++;
 115                 if (rw == READ && !bh->b_uptodate) {
 116                         jfs_debug(3, "reading block %lu/%p\n",
 117                                   (unsigned long) bh->b_blocknr, (void *) bh);
 118                         retval = io_channel_read_blk(bh->b_io,
 119                                                      bh->b_blocknr,
 120                                                      1, bh->b_data);
 121                         if (retval) {
 122                                 com_err(bh->b_ctx->device_name, retval,
 123                                         "while reading block %lu\n",
 124                                         (unsigned long) bh->b_blocknr);
 125                                 bh->b_err = retval;
 126                                 continue;
 127                         }
 128                         bh->b_uptodate = 1;
 129                 } else if (rw == WRITE && bh->b_dirty) {
 130                         jfs_debug(3, "writing block %lu/%p\n",
 131                                   (unsigned long) bh->b_blocknr, (void *) bh);
 132                         retval = io_channel_write_blk(bh->b_io,
 133                                                       bh->b_blocknr,
 134                                                       1, bh->b_data);
 135                         if (retval) {
 136                                 com_err(bh->b_ctx->device_name, retval,
 137                                         "while writing block %lu\n",
 138                                         (unsigned long) bh->b_blocknr);
 139                                 bh->b_err = retval;
 140                                 continue;
 141                         }
 142                         bh->b_dirty = 0;
 143                         bh->b_uptodate = 1;
 144                 } else {
 145                         jfs_debug(3, "no-op %s for block %lu\n",
 146                                   rw == READ ? "read" : "write",
 147                                   (unsigned long) bh->b_blocknr);
 148                 }
 149         }
 150 }
 151
 152 void mark_buffer_dirty(struct buffer_head *bh)
 153 {
 154         bh->b_dirty = 1;
 155 }
 156
 157 static void mark_buffer_clean(struct buffer_head * bh)
 158 {
 159         bh->b_dirty = 0;
 160 }
 161
 162 void brelse(struct buffer_head *bh)
 163 {
 164         if (bh->b_dirty)
 165                 ll_rw_block(WRITE, 1, &bh);
 166         jfs_debug(3, "freeing block %lu/%p (total %d)\n",
 167                   (unsigned long) bh->b_blocknr, (void *) bh, --bh_count);
 168         ext2fs_free_mem(&bh);
 169 }
 170
 171 int buffer_uptodate(struct buffer_head *bh)
 172 {
 173         return bh->b_uptodate;
 174 }
 175
 176 void mark_buffer_uptodate(struct buffer_head *bh, int val)
 177 {
 178         bh->b_uptodate = val;
 179 }
 180
 181 void wait_on_buffer(struct buffer_head *bh)
 182 {
 183         if (!bh->b_uptodate)
 184                 ll_rw_block(READ, 1, &bh);
 185 }
 186
 187
 188 static void e2fsck_clear_recover(e2fsck_t ctx, int error)
 189 {
 190         ctx->fs->super->s_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER;
 191
 192         /* if we had an error doing journal recovery, we need a full fsck */
 193         if (error)
 194                 ctx->fs->super->s_state &= ~EXT2_VALID_FS;
 195         ext2fs_mark_super_dirty(ctx->fs);
 196 }
 197
 198 /*
 199  * This is a helper function to check the validity of the journal.
 200  */
 201 struct process_block_struct {
 202         e2_blkcnt_t     last_block;
 203 };
 204
 205 static int process_journal_block(ext2_filsys fs,
 206                                  blk_t  *block_nr,
 207                                  e2_blkcnt_t blockcnt,
 208                                  blk_t ref_block EXT2FS_ATTR((unused)),
 209                                  int ref_offset EXT2FS_ATTR((unused)),
 210                                  void *priv_data)
 211 {
 212         struct process_block_struct *p;
 213         blk_t   blk = *block_nr;
 214
 215         p = (struct process_block_struct *) priv_data;
 216
 217         if (blk < fs->super->s_first_data_block ||
 218             blk >= fs->super->s_blocks_count)
 219                 return BLOCK_ABORT;
 220
 221         if (blockcnt >= 0)
 222                 p->last_block = blockcnt;
 223         return 0;
 224 }
 225
 226 static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal)
 227 {
 228         struct process_block_struct pb;
 229         struct ext2_super_block *sb = ctx->fs->super;
 230         struct ext2_super_block jsuper;
 231         struct problem_context  pctx;
 232         struct buffer_head      *bh;
 233         struct inode            *j_inode = NULL;
 234         struct kdev_s           *dev_fs = NULL, *dev_journal;
 235         const char              *journal_name = 0;
 236         journal_t               *journal = NULL;
 237         errcode_t               retval = 0;
 238         io_manager              io_ptr = 0;
 239         unsigned long           start = 0;
 240         int                     ext_journal = 0;
 241         int                     tried_backup_jnl = 0;
 242
 243         clear_problem_context(&pctx);
 244
 245         journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal");
 246         if (!journal) {
 247                 return EXT2_ET_NO_MEMORY;
 248         }
 249
 250         dev_fs = e2fsck_allocate_memory(ctx, 2*sizeof(struct kdev_s), "kdev");
 251         if (!dev_fs) {
 252                 retval = EXT2_ET_NO_MEMORY;
 253                 goto errout;
 254         }
 255         dev_journal = dev_fs+1;
 256
 257         dev_fs->k_ctx = dev_journal->k_ctx = ctx;
 258         dev_fs->k_dev = K_DEV_FS;
 259         dev_journal->k_dev = K_DEV_JOURNAL;
 260
 261         journal->j_dev = dev_journal;
 262         journal->j_fs_dev = dev_fs;
 263         journal->j_inode = NULL;
 264         journal->j_blocksize = ctx->fs->blocksize;
 265
 266         if (uuid_is_null(sb->s_journal_uuid)) {
 267                 if (!sb->s_journal_inum) {
 268                         retval = EXT2_ET_BAD_INODE_NUM;
 269                         goto errout;
 270                 }
 271                 j_inode = e2fsck_allocate_memory(ctx, sizeof(*j_inode),
 272                                                  "journal inode");
 273                 if (!j_inode) {
 274                         retval = EXT2_ET_NO_MEMORY;
 275                         goto errout;
 276                 }
 277
 278                 j_inode->i_ctx = ctx;
 279                 j_inode->i_ino = sb->s_journal_inum;
 280
 281                 if ((retval = ext2fs_read_inode(ctx->fs,
 282                                                 sb->s_journal_inum,
 283                                                 &j_inode->i_ext2))) {
 284                 try_backup_journal:
 285                         if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS ||
 286                             tried_backup_jnl)
 287                                 goto errout;
 288                         memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode));
 289                         memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks,
 290                                EXT2_N_BLOCKS*4);
 291                         j_inode->i_ext2.i_size = sb->s_jnl_blocks[16];
 292                         j_inode->i_ext2.i_links_count = 1;
 293                         j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600;
 294                         e2fsck_use_inode_shortcuts(ctx, 1);
 295                         ctx->stashed_ino = j_inode->i_ino;
 296                         ctx->stashed_inode = &j_inode->i_ext2;
 297                         tried_backup_jnl++;
 298                 }
 299                 if (!j_inode->i_ext2.i_links_count ||
 300                     !LINUX_S_ISREG(j_inode->i_ext2.i_mode)) {
 301                         retval = EXT2_ET_NO_JOURNAL;
 302                         goto try_backup_journal;
 303                 }
 304                 if (j_inode->i_ext2.i_size / journal->j_blocksize <
 305                     JFS_MIN_JOURNAL_BLOCKS) {
 306                         retval = EXT2_ET_JOURNAL_TOO_SMALL;
 307                         goto try_backup_journal;
 308                 }
 309                 pb.last_block = -1;
 310                 retval = ext2fs_block_iterate2(ctx->fs, j_inode->i_ino,
 311                                                BLOCK_FLAG_HOLE, 0,
 312                                                process_journal_block, &pb);
 313                 if ((pb.last_block+1) * ctx->fs->blocksize <
 314                     j_inode->i_ext2.i_size) {
 315                         retval = EXT2_ET_JOURNAL_TOO_SMALL;
 316                         goto try_backup_journal;
 317                 }
 318                 if (tried_backup_jnl && !(ctx->options & E2F_OPT_READONLY)) {
 319                         retval = ext2fs_write_inode(ctx->fs, sb->s_journal_inum,
 320                                                     &j_inode->i_ext2);
 321                         if (retval)
 322                                 goto errout;
 323                 }
 324
 325                 journal->j_maxlen = j_inode->i_ext2.i_size / journal->j_blocksize;
 326
 327 #ifdef USE_INODE_IO
 328                 retval = ext2fs_inode_io_intern2(ctx->fs, sb->s_journal_inum,
 329                                                  &j_inode->i_ext2,
 330                                                  &journal_name);
 331                 if (retval)
 332                         goto errout;
 333
 334                 io_ptr = inode_io_manager;
 335 #else
 336                 journal->j_inode = j_inode;
 337                 ctx->journal_io = ctx->fs->io;
 338                 if ((retval = journal_bmap(journal, 0, &start)) != 0)
 339                         goto errout;
 340 #endif
 341         } else {
 342                 ext_journal = 1;
 343                 if (!ctx->journal_name) {
 344                         char uuid[37];
 345
 346                         uuid_unparse(sb->s_journal_uuid, uuid);
 347                         ctx->journal_name = blkid_get_devname(ctx->blkid,
 348                                                               "UUID", uuid);
 349                         if (!ctx->journal_name)
 350                                 ctx->journal_name = blkid_devno_to_devname(sb->s_journal_dev);
 351                 }
 352                 journal_name = ctx->journal_name;
 353
 354                 if (!journal_name) {
 355                         fix_problem(ctx, PR_0_CANT_FIND_JOURNAL, &pctx);
 356                         retval = EXT2_ET_LOAD_EXT_JOURNAL;
 357                         goto errout;
 358                 }
 359
 360                 jfs_debug(1, "Using journal file %s\n", journal_name);
 361                 io_ptr = unix_io_manager;
 362         }
 363
 364 #if 0
 365         test_io_backing_manager = io_ptr;
 366         io_ptr = test_io_manager;
 367 #endif
 368 #ifndef USE_INODE_IO
 369         if (ext_journal)
 370 #endif
 371                 retval = io_ptr->open(journal_name, IO_FLAG_RW,
 372                                       &ctx->journal_io);
 373         if (retval)
 374                 goto errout;
 375
 376         io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize);
 377
 378         if (ext_journal) {
 379                 if (ctx->fs->blocksize == 1024)
 380                         start = 1;
 381                 bh = getblk(dev_journal, start, ctx->fs->blocksize);
 382                 if (!bh) {
 383                         retval = EXT2_ET_NO_MEMORY;
 384                         goto errout;
 385                 }
 386                 ll_rw_block(READ, 1, &bh);
 387                 if ((retval = bh->b_err) != 0) {
 388                         brelse(bh);
 389                         goto errout;
 390                 }
 391                 memcpy(&jsuper, start ? bh->b_data :  bh->b_data + 1024,
 392                        sizeof(jsuper));
 393                 brelse(bh);
 394 #ifdef WORDS_BIGENDIAN
 395                 if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
 396                         ext2fs_swap_super(&jsuper);
 397 #endif
 398                 if (jsuper.s_magic != EXT2_SUPER_MAGIC ||
 399                     !(jsuper.s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
 400                         fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx);
 401                         retval = EXT2_ET_LOAD_EXT_JOURNAL;
 402                         goto errout;
 403                 }
 404                 /* Make sure the journal UUID is correct */
 405                 if (memcmp(jsuper.s_uuid, ctx->fs->super->s_journal_uuid,
 406                            sizeof(jsuper.s_uuid))) {
 407                         fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx);
 408                         retval = EXT2_ET_LOAD_EXT_JOURNAL;
 409                         goto errout;
 410                 }
 411
 412                 journal->j_maxlen = jsuper.s_blocks_count;
 413                 start++;
 414         }
 415
 416         if (!(bh = getblk(dev_journal, start, journal->j_blocksize))) {
 417                 retval = EXT2_ET_NO_MEMORY;
 418                 goto errout;
 419         }
 420
 421         journal->j_sb_buffer = bh;
 422         journal->j_superblock = (journal_superblock_t *)bh->b_data;
 423
 424 #ifdef USE_INODE_IO
 425         if (j_inode)
 426                 ext2fs_free_mem(&j_inode);
 427 #endif
 428
 429         *ret_journal = journal;
 430         e2fsck_use_inode_shortcuts(ctx, 0);
 431         return 0;
 432
 433 errout:
 434         e2fsck_use_inode_shortcuts(ctx, 0);
 435         if (dev_fs)
 436                 ext2fs_free_mem(&dev_fs);
 437         if (j_inode)
 438                 ext2fs_free_mem(&j_inode);
 439         if (journal)
 440                 ext2fs_free_mem(&journal);
 441         return retval;
 442 }
 443
 444 static errcode_t e2fsck_journal_fix_bad_inode(e2fsck_t ctx,
 445                                               struct problem_context *pctx)
 446 {
 447         struct ext2_super_block *sb = ctx->fs->super;
 448         int recover = ctx->fs->super->s_feature_incompat &
 449                 EXT3_FEATURE_INCOMPAT_RECOVER;
 450         int has_journal = ctx->fs->super->s_feature_compat &
 451                 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 452
 453         if (has_journal || sb->s_journal_inum) {
 454                 /* The journal inode is bogus, remove and force full fsck */
 455                 pctx->ino = sb->s_journal_inum;
 456                 if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) {
 457                         if (has_journal && sb->s_journal_inum)
 458                                 printf("*** ext3 journal has been deleted - "
 459                                        "filesystem is now ext2 only ***\n\n");
 460                         sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 461                         sb->s_journal_inum = 0;
 462                         ctx->flags |= E2F_FLAG_JOURNAL_INODE;
 463                         ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 464                         e2fsck_clear_recover(ctx, 1);
 465                         return 0;
 466                 }
 467                 return EXT2_ET_BAD_INODE_NUM;
 468         } else if (recover) {
 469                 if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) {
 470                         e2fsck_clear_recover(ctx, 1);
 471                         return 0;
 472                 }
 473                 return EXT2_ET_UNSUPP_FEATURE;
 474         }
 475         return 0;
 476 }
 477
 478 #define V1_SB_SIZE      0x0024
 479 static void clear_v2_journal_fields(journal_t *journal)
 480 {
 481         e2fsck_t ctx = journal->j_dev->k_ctx;
 482         struct problem_context pctx;
 483
 484         clear_problem_context(&pctx);
 485
 486         if (!fix_problem(ctx, PR_0_CLEAR_V2_JOURNAL, &pctx))
 487                 return;
 488
 489         memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0,
 490                ctx->fs->blocksize-V1_SB_SIZE);
 491         mark_buffer_dirty(journal->j_sb_buffer);
 492 }
 493
 494
 495 static errcode_t e2fsck_journal_load(journal_t *journal)
 496 {
 497         e2fsck_t ctx = journal->j_dev->k_ctx;
 498         journal_superblock_t *jsb;
 499         struct buffer_head *jbh = journal->j_sb_buffer;
 500         struct problem_context pctx;
 501
 502         clear_problem_context(&pctx);
 503
 504         ll_rw_block(READ, 1, &jbh);
 505         if (jbh->b_err) {
 506                 com_err(ctx->device_name, jbh->b_err,
 507                         _("reading journal superblock\n"));
 508                 return jbh->b_err;
 509         }
 510
 511         jsb = journal->j_superblock;
 512         /* If we don't even have JFS_MAGIC, we probably have a wrong inode */
 513         if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER))
 514                 return e2fsck_journal_fix_bad_inode(ctx, &pctx);
 515
 516         switch (ntohl(jsb->s_header.h_blocktype)) {
 517         case JFS_SUPERBLOCK_V1:
 518                 journal->j_format_version = 1;
 519                 if (jsb->s_feature_compat ||
 520                     jsb->s_feature_incompat ||
 521                     jsb->s_feature_ro_compat ||
 522                     jsb->s_nr_users)
 523                         clear_v2_journal_fields(journal);
 524                 break;
 525
 526         case JFS_SUPERBLOCK_V2:
 527                 journal->j_format_version = 2;
 528                 if (ntohl(jsb->s_nr_users) > 1 &&
 529                     uuid_is_null(ctx->fs->super->s_journal_uuid))
 530                         clear_v2_journal_fields(journal);
 531                 if (ntohl(jsb->s_nr_users) > 1) {
 532                         fix_problem(ctx, PR_0_JOURNAL_UNSUPP_MULTIFS, &pctx);
 533                         return EXT2_ET_JOURNAL_UNSUPP_VERSION;
 534                 }
 535                 break;
 536
 537         /*
 538          * These should never appear in a journal super block, so if
 539          * they do, the journal is badly corrupted.
 540          */
 541         case JFS_DESCRIPTOR_BLOCK:
 542         case JFS_COMMIT_BLOCK:
 543         case JFS_REVOKE_BLOCK:
 544                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 545
 546         /* If we don't understand the superblock major type, but there
 547          * is a magic number, then it is likely to be a new format we
 548          * just don't understand, so leave it alone. */
 549         default:
 550                 return EXT2_ET_JOURNAL_UNSUPP_VERSION;
 551         }
 552
 553         if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES))
 554                 return EXT2_ET_UNSUPP_FEATURE;
 555
 556         if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES))
 557                 return EXT2_ET_RO_UNSUPP_FEATURE;
 558
 559         /* We have now checked whether we know enough about the journal
 560          * format to be able to proceed safely, so any other checks that
 561          * fail we should attempt to recover from. */
 562         if (jsb->s_blocksize != htonl(journal->j_blocksize)) {
 563                 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK,
 564                         _("%s: no valid journal superblock found\n"),
 565                         ctx->device_name);
 566                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 567         }
 568
 569         if (ntohl(jsb->s_maxlen) < journal->j_maxlen)
 570                 journal->j_maxlen = ntohl(jsb->s_maxlen);
 571         else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) {
 572                 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK,
 573                         _("%s: journal too short\n"),
 574                         ctx->device_name);
 575                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 576         }
 577
 578         journal->j_tail_sequence = ntohl(jsb->s_sequence);
 579         journal->j_transaction_sequence = journal->j_tail_sequence;
 580         journal->j_tail = ntohl(jsb->s_start);
 581         journal->j_first = ntohl(jsb->s_first);
 582         journal->j_last = ntohl(jsb->s_maxlen);
 583
 584         return 0;
 585 }
 586
 587 static void e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb,
 588                                        journal_t *journal)
 589 {
 590         char *p;
 591         union {
 592                 uuid_t uuid;
 593                 __u32 val[4];
 594         } u;
 595         __u32 new_seq = 0;
 596         int i;
 597
 598         /* Leave a valid existing V1 superblock signature alone.
 599          * Anything unrecognisable we overwrite with a new V2
 600          * signature. */
 601
 602         if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER) ||
 603             jsb->s_header.h_blocktype != htonl(JFS_SUPERBLOCK_V1)) {
 604                 jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER);
 605                 jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2);
 606         }
 607
 608         /* Zero out everything else beyond the superblock header */
 609
 610         p = ((char *) jsb) + sizeof(journal_header_t);
 611         memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t));
 612
 613         jsb->s_blocksize = htonl(ctx->fs->blocksize);
 614         jsb->s_maxlen = htonl(journal->j_maxlen);
 615         jsb->s_first = htonl(1);
 616
 617         /* Initialize the journal sequence number so that there is "no"
 618          * chance we will find old "valid" transactions in the journal.
 619          * This avoids the need to zero the whole journal (slow to do,
 620          * and risky when we are just recovering the filesystem).
 621          */
 622         uuid_generate(u.uuid);
 623         for (i = 0; i < 4; i ++)
 624                 new_seq ^= u.val[i];
 625         jsb->s_sequence = htonl(new_seq);
 626
 627         mark_buffer_dirty(journal->j_sb_buffer);
 628         ll_rw_block(WRITE, 1, &journal->j_sb_buffer);
 629 }
 630
 631 static errcode_t e2fsck_journal_fix_corrupt_super(e2fsck_t ctx,
 632                                                   journal_t *journal,
 633                                                   struct problem_context *pctx)
 634 {
 635         struct ext2_super_block *sb = ctx->fs->super;
 636         int recover = ctx->fs->super->s_feature_incompat &
 637                 EXT3_FEATURE_INCOMPAT_RECOVER;
 638
 639         if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
 640                 if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) {
 641                         e2fsck_journal_reset_super(ctx, journal->j_superblock,
 642                                                    journal);
 643                         journal->j_transaction_sequence = 1;
 644                         e2fsck_clear_recover(ctx, recover);
 645                         return 0;
 646                 }
 647                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 648         } else if (e2fsck_journal_fix_bad_inode(ctx, pctx))
 649                 return EXT2_ET_CORRUPT_SUPERBLOCK;
 650
 651         return 0;
 652 }
 653
 654 static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal,
 655                                    int reset, int drop)
 656 {
 657         journal_superblock_t *jsb;
 658
 659         if (drop)
 660                 mark_buffer_clean(journal->j_sb_buffer);
 661         else if (!(ctx->options & E2F_OPT_READONLY)) {
 662                 jsb = journal->j_superblock;
 663                 jsb->s_sequence = htonl(journal->j_transaction_sequence);
 664                 if (reset)
 665                         jsb->s_start = 0; /* this marks the journal as empty */
 666                 mark_buffer_dirty(journal->j_sb_buffer);
 667         }
 668         brelse(journal->j_sb_buffer);
 669
 670         if (ctx->journal_io) {
 671                 if (ctx->fs && ctx->fs->io != ctx->journal_io)
 672                         io_channel_close(ctx->journal_io);
 673                 ctx->journal_io = 0;
 674         }
 675
 676 #ifndef USE_INODE_IO
 677         if (journal->j_inode)
 678                 ext2fs_free_mem(&journal->j_inode);
 679 #endif
 680         if (journal->j_fs_dev)
 681                 ext2fs_free_mem(&journal->j_fs_dev);
 682         ext2fs_free_mem(&journal);
 683 }
 684
 685 /*
 686  * This function makes sure that the superblock fields regarding the
 687  * journal are consistent.
 688  */
 689 int e2fsck_check_ext3_journal(e2fsck_t ctx)
 690 {
 691         struct ext2_super_block *sb = ctx->fs->super;
 692         journal_t *journal;
 693         int recover = ctx->fs->super->s_feature_incompat &
 694                 EXT3_FEATURE_INCOMPAT_RECOVER;
 695         struct problem_context pctx;
 696         problem_t problem;
 697         int reset = 0, force_fsck = 0;
 698         int retval;
 699
 700         /* If we don't have any journal features, don't do anything more */
 701         if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
 702             !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 &&
 703             uuid_is_null(sb->s_journal_uuid))
 704                 return 0;
 705
 706         clear_problem_context(&pctx);
 707         pctx.num = sb->s_journal_inum;
 708
 709         retval = e2fsck_get_journal(ctx, &journal);
 710         if (retval) {
 711                 if ((retval == EXT2_ET_BAD_INODE_NUM) ||
 712                     (retval == EXT2_ET_BAD_BLOCK_NUM) ||
 713                     (retval == EXT2_ET_JOURNAL_TOO_SMALL) ||
 714                     (retval == EXT2_ET_NO_JOURNAL))
 715                         return e2fsck_journal_fix_bad_inode(ctx, &pctx);
 716                 return retval;
 717         }
 718
 719         retval = e2fsck_journal_load(journal);
 720         if (retval) {
 721                 if ((retval == EXT2_ET_CORRUPT_SUPERBLOCK) ||
 722                     ((retval == EXT2_ET_UNSUPP_FEATURE) &&
 723                     (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_INCOMPAT,
 724                                   &pctx))) ||
 725                     ((retval == EXT2_ET_RO_UNSUPP_FEATURE) &&
 726                     (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_ROCOMPAT,
 727                                   &pctx))) ||
 728                     ((retval == EXT2_ET_JOURNAL_UNSUPP_VERSION) &&
 729                     (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_VERSION, &pctx))))
 730                         retval = e2fsck_journal_fix_corrupt_super(ctx, journal,
 731                                                                   &pctx);
 732                 e2fsck_journal_release(ctx, journal, 0, 1);
 733                 return retval;
 734         }
 735
 736         /*
 737          * We want to make the flags consistent here.  We will not leave with
 738          * needs_recovery set but has_journal clear.  We can't get in a loop
 739          * with -y, -n, or -p, only if a user isn't making up their mind.
 740          */
 741 no_has_journal:
 742         if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
 743                 recover = sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER;
 744                 pctx.str = "inode";
 745                 if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) {
 746                         if (recover &&
 747                             !fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx))
 748                                 goto no_has_journal;
 749                         /*
 750                          * Need a full fsck if we are releasing a
 751                          * journal stored on a reserved inode.
 752                          */
 753                         force_fsck = recover ||
 754                                 (sb->s_journal_inum < EXT2_FIRST_INODE(sb));
 755                         /* Clear all of the journal fields */
 756                         sb->s_journal_inum = 0;
 757                         sb->s_journal_dev = 0;
 758                         memset(sb->s_journal_uuid, 0,
 759                                sizeof(sb->s_journal_uuid));
 760                         e2fsck_clear_recover(ctx, force_fsck);
 761                 } else if (!(ctx->options & E2F_OPT_READONLY)) {
 762                         sb->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 763                         ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 764                         ext2fs_mark_super_dirty(ctx->fs);
 765                 }
 766         }
 767
 768         if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL &&
 769             !(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) &&
 770             journal->j_superblock->s_start != 0) {
 771                 /* Print status information */
 772                 fix_problem(ctx, PR_0_JOURNAL_RECOVERY_CLEAR, &pctx);
 773                 if (ctx->superblock)
 774                         problem = PR_0_JOURNAL_RUN_DEFAULT;
 775                 else
 776                         problem = PR_0_JOURNAL_RUN;
 777                 if (fix_problem(ctx, problem, &pctx)) {
 778                         ctx->options |= E2F_OPT_FORCE;
 779                         sb->s_feature_incompat |=
 780                                 EXT3_FEATURE_INCOMPAT_RECOVER;
 781                         ext2fs_mark_super_dirty(ctx->fs);
 782                 } else if (fix_problem(ctx,
 783                                        PR_0_JOURNAL_RESET_JOURNAL, &pctx)) {
 784                         reset = 1;
 785                         sb->s_state &= ~EXT2_VALID_FS;
 786                         ext2fs_mark_super_dirty(ctx->fs);
 787                 }
 788                 /*
 789                  * If the user answers no to the above question, we
 790                  * ignore the fact that journal apparently has data;
 791                  * accidentally replaying over valid data would be far
 792                  * worse than skipping a questionable recovery.
 793                  *
 794                  * XXX should we abort with a fatal error here?  What
 795                  * will the ext3 kernel code do if a filesystem with
 796                  * !NEEDS_RECOVERY but with a non-zero
 797                  * journal->j_superblock->s_start is mounted?
 798                  */
 799         }
 800
 801         e2fsck_journal_release(ctx, journal, reset, 0);
 802         return retval;
 803 }
 804
 805 static errcode_t recover_ext3_journal(e2fsck_t ctx)
 806 {
 807         struct problem_context  pctx;
 808         journal_t *journal;
 809         int retval;
 810
 811         clear_problem_context(&pctx);
 812
 813         journal_init_revoke_caches();
 814         retval = e2fsck_get_journal(ctx, &journal);
 815         if (retval)
 816                 return retval;
 817
 818         retval = e2fsck_journal_load(journal);
 819         if (retval)
 820                 goto errout;
 821
 822         retval = journal_init_revoke(journal, 1024);
 823         if (retval)
 824                 goto errout;
 825
 826         retval = -journal_recover(journal);
 827         if (retval)
 828                 goto errout;
 829
 830         if (journal->j_failed_commit) {
 831                 pctx.ino = journal->j_failed_commit;
 832                 fix_problem(ctx, PR_0_JNL_TXN_CORRUPT, &pctx);
 833                 ctx->fs->super->s_state |= EXT2_ERROR_FS;
 834                 ext2fs_mark_super_dirty(ctx->fs);
 835         }
 836
 837
 838         if (journal->j_superblock->s_errno) {
 839                 ctx->fs->super->s_state |= EXT2_ERROR_FS;
 840                 ext2fs_mark_super_dirty(ctx->fs);
 841                 journal->j_superblock->s_errno = 0;
 842                 mark_buffer_dirty(journal->j_sb_buffer);
 843         }
 844
 845 errout:
 846         journal_destroy_revoke(journal);
 847         journal_destroy_revoke_caches();
 848         e2fsck_journal_release(ctx, journal, 1, 0);
 849         return retval;
 850 }
 851
 852 int e2fsck_run_ext3_journal(e2fsck_t ctx)
 853 {
 854         io_manager io_ptr = ctx->fs->io->manager;
 855         int blocksize = ctx->fs->blocksize;
 856         errcode_t       retval, recover_retval;
 857         io_stats        stats = 0;
 858         unsigned long long kbytes_written = 0;
 859
 860         printf(_("%s: recovering journal\n"), ctx->device_name);
 861         if (ctx->options & E2F_OPT_READONLY) {
 862                 printf(_("%s: won't do journal recovery while read-only\n"),
 863                        ctx->device_name);
 864                 return EXT2_ET_FILE_RO;
 865         }
 866
 867         if (ctx->fs->flags & EXT2_FLAG_DIRTY)
 868                 ext2fs_flush(ctx->fs);  /* Force out any modifications */
 869
 870         recover_retval = recover_ext3_journal(ctx);
 871
 872         /*
 873          * Reload the filesystem context to get up-to-date data from disk
 874          * because journal recovery will change the filesystem under us.
 875          */
 876         if (ctx->fs->super->s_kbytes_written &&
 877             ctx->fs->io->manager->get_stats)
 878                 ctx->fs->io->manager->get_stats(ctx->fs->io, &stats);
 879         if (stats && stats->bytes_written)
 880                 kbytes_written = stats->bytes_written >> 10;
 881         ext2fs_free(ctx->fs);
 882         retval = ext2fs_open(ctx->filesystem_name, EXT2_FLAG_RW,
 883                              ctx->superblock, blocksize, io_ptr,
 884                              &ctx->fs);
 885         if (retval) {
 886                 com_err(ctx->program_name, retval,
 887                         _("while trying to re-open %s"),
 888                         ctx->device_name);
 889                 fatal_error(ctx, 0);
 890         }
 891         ctx->fs->priv_data = ctx;
 892         ctx->fs->now = ctx->now;
 893         ctx->fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
 894         ctx->fs->super->s_kbytes_written += kbytes_written;
 895
 896         /* Set the superblock flags */
 897         e2fsck_clear_recover(ctx, recover_retval);
 898         return recover_retval;
 899 }
 900
 901 /*
 902  * This function will move the journal inode from a visible file in
 903  * the filesystem directory hierarchy to the reserved inode if necessary.
 904  */
 905 static const char * const journal_names[] = {
 906         ".journal", "journal", ".journal.dat", "journal.dat", 0 };
 907
 908 void e2fsck_move_ext3_journal(e2fsck_t ctx)
 909 {
 910         struct ext2_super_block *sb = ctx->fs->super;
 911         struct problem_context  pctx;
 912         struct ext2_inode       inode;
 913         ext2_filsys             fs = ctx->fs;
 914         ext2_ino_t              ino;
 915         errcode_t               retval;
 916         const char * const *    cpp;
 917         int                     group, mount_flags;
 918
 919         clear_problem_context(&pctx);
 920
 921         /*
 922          * If the filesystem is opened read-only, or there is no
 923          * journal, then do nothing.
 924          */
 925         if ((ctx->options & E2F_OPT_READONLY) ||
 926             (sb->s_journal_inum == 0) ||
 927             !(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL))
 928                 return;
 929
 930         /*
 931          * Read in the journal inode
 932          */
 933         if (ext2fs_read_inode(fs, sb->s_journal_inum, &inode) != 0)
 934                 return;
 935
 936         /*
 937          * If it's necessary to backup the journal inode, do so.
 938          */
 939         if ((sb->s_jnl_backup_type == 0) ||
 940             ((sb->s_jnl_backup_type == EXT3_JNL_BACKUP_BLOCKS) &&
 941              memcmp(inode.i_block, sb->s_jnl_blocks, EXT2_N_BLOCKS*4))) {
 942                 if (fix_problem(ctx, PR_0_BACKUP_JNL, &pctx)) {
 943                         memcpy(sb->s_jnl_blocks, inode.i_block,
 944                                EXT2_N_BLOCKS*4);
 945                         sb->s_jnl_blocks[16] = inode.i_size;
 946                         sb->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
 947                         ext2fs_mark_super_dirty(fs);
 948                         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 949                 }
 950         }
 951
 952         /*
 953          * If the journal is already the hidden inode, then do nothing
 954          */
 955         if (sb->s_journal_inum == EXT2_JOURNAL_INO)
 956                 return;
 957
 958         /*
 959          * The journal inode had better have only one link and not be readable.
 960          */
 961         if (inode.i_links_count != 1)
 962                 return;
 963
 964         /*
 965          * If the filesystem is mounted, or we can't tell whether
 966          * or not it's mounted, do nothing.
 967          */
 968         retval = ext2fs_check_if_mounted(ctx->filesystem_name, &mount_flags);
 969         if (retval || (mount_flags & EXT2_MF_MOUNTED))
 970                 return;
 971
 972         /*
 973          * If we can't find the name of the journal inode, then do
 974          * nothing.
 975          */
 976         for (cpp = journal_names; *cpp; cpp++) {
 977                 retval = ext2fs_lookup(fs, EXT2_ROOT_INO, *cpp,
 978                                        strlen(*cpp), 0, &ino);
 979                 if ((retval == 0) && (ino == sb->s_journal_inum))
 980                         break;
 981         }
 982         if (*cpp == 0)
 983                 return;
 984
 985         /* We need the inode bitmap to be loaded */
 986         retval = ext2fs_read_bitmaps(fs);
 987         if (retval)
 988                 return;
 989
 990         pctx.str = *cpp;
 991         if (!fix_problem(ctx, PR_0_MOVE_JOURNAL, &pctx))
 992                 return;
 993
 994         /*
 995          * OK, we've done all the checks, let's actually move the
 996          * journal inode.  Errors at this point mean we need to force
 997          * an ext2 filesystem check.
 998          */
 999         if ((retval = ext2fs_unlink(fs, EXT2_ROOT_INO, *cpp, ino, 0)) != 0)
1000                 goto err_out;
1001         if ((retval = ext2fs_write_inode(fs, EXT2_JOURNAL_INO, &inode)) != 0)
1002                 goto err_out;
1003         sb->s_journal_inum = EXT2_JOURNAL_INO;
1004         ext2fs_mark_super_dirty(fs);
1005         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
1006         inode.i_links_count = 0;
1007         inode.i_dtime = ctx->now;
1008         if ((retval = ext2fs_write_inode(fs, ino, &inode)) != 0)
1009                 goto err_out;
1010
1011         group = ext2fs_group_of_ino(fs, ino);
1012         ext2fs_unmark_inode_bitmap(fs->inode_map, ino);
1013         ext2fs_mark_ib_dirty(fs);
1014         fs->group_desc[group].bg_free_inodes_count++;
1015         ext2fs_group_desc_csum_set(fs, group);
1016         fs->super->s_free_inodes_count++;
1017         return;
1018
1019 err_out:
1020         pctx.errcode = retval;
1021         fix_problem(ctx, PR_0_ERR_MOVE_JOURNAL, &pctx);
1022         fs->super->s_state &= ~EXT2_VALID_FS;
1023         ext2fs_mark_super_dirty(fs);
1024         return;
1025 }
1026
1027 /*
1028  * This function makes sure the superblock hint for the external
1029  * journal is correct.
1030  */
1031 int e2fsck_fix_ext3_journal_hint(e2fsck_t ctx)
1032 {
1033         struct ext2_super_block *sb = ctx->fs->super;
1034         struct problem_context pctx;
1035         char uuid[37], *journal_name;
1036         struct stat st;
1037
1038         if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) ||
1039             uuid_is_null(sb->s_journal_uuid))
1040                 return 0;
1041
1042         uuid_unparse(sb->s_journal_uuid, uuid);
1043         journal_name = blkid_get_devname(ctx->blkid, "UUID", uuid);
1044         if (!journal_name)
1045                 return 0;
1046
1047         if (stat(journal_name, &st) < 0)
1048                 return 0;
1049
1050         if (st.st_rdev != sb->s_journal_dev) {
1051                 clear_problem_context(&pctx);
1052                 pctx.num = st.st_rdev;
1053                 if (fix_problem(ctx, PR_0_EXTERNAL_JOURNAL_HINT, &pctx)) {
1054                         sb->s_journal_dev = st.st_rdev;
1055                         ext2fs_mark_super_dirty(ctx->fs);
1056                 }
1057         }
1058
1059         free(journal_name);
1060         return 0;
1061 }