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, blk64_t block, unsigned long 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 blk64_t pblk; 55 56 if (!inode) { 57 *phys = block; 58 return 0; 59 } 60 61 retval= ext2fs_bmap2(inode->i_ctx->fs, inode->i_ino, 62 &inode->i_ext2, NULL, 0, block, 0, &pblk); 63 *phys = pblk; 64 return (int) retval; 65 #endif 66 } 67 68 struct buffer_head *getblk(kdev_t kdev, blk64_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 %llu (%d bytes)(total %d)\n", 83 (unsigned long 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 errcode_t 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 %llu/%p\n", 117 bh->b_blocknr, (void *) bh); 118 retval = io_channel_read_blk64(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 %llu\n", 124 bh->b_blocknr); 125 bh->b_err = (int) retval; 126 continue; 127 } 128 bh->b_uptodate = 1; 129 } else if (rw == WRITE && bh->b_dirty) { 130 jfs_debug(3, "writing block %llu/%p\n", 131 bh->b_blocknr, 132 (void *) bh); 133 retval = io_channel_write_blk64(bh->b_io, 134 bh->b_blocknr, 135 1, bh->b_data); 136 if (retval) { 137 com_err(bh->b_ctx->device_name, retval, 138 "while writing block %llu\n", 139 bh->b_blocknr); 140 bh->b_err = (int) retval; 141 continue; 142 } 143 bh->b_dirty = 0; 144 bh->b_uptodate = 1; 145 } else { 146 jfs_debug(3, "no-op %s for block %llu\n", 147 rw == READ ? "read" : "write", 148 bh->b_blocknr); 149 } 150 } 151 } 152 153 void mark_buffer_dirty(struct buffer_head *bh) 154 { 155 bh->b_dirty = 1; 156 } 157 158 static void mark_buffer_clean(struct buffer_head * bh) 159 { 160 bh->b_dirty = 0; 161 } 162 163 void brelse(struct buffer_head *bh) 164 { 165 if (bh->b_dirty) 166 ll_rw_block(WRITE, 1, &bh); 167 jfs_debug(3, "freeing block %llu/%p (total %d)\n", 168 bh->b_blocknr, (void *) bh, --bh_count); 169 ext2fs_free_mem(&bh); 170 } 171 172 int buffer_uptodate(struct buffer_head *bh) 173 { 174 return bh->b_uptodate; 175 } 176 177 void mark_buffer_uptodate(struct buffer_head *bh, int val) 178 { 179 bh->b_uptodate = val; 180 } 181 182 void wait_on_buffer(struct buffer_head *bh) 183 { 184 if (!bh->b_uptodate) 185 ll_rw_block(READ, 1, &bh); 186 } 187 188 189 static void e2fsck_clear_recover(e2fsck_t ctx, int error) 190 { 191 ctx->fs->super->s_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER; 192 193 /* if we had an error doing journal recovery, we need a full fsck */ 194 if (error) 195 ctx->fs->super->s_state &= ~EXT2_VALID_FS; 196 ext2fs_mark_super_dirty(ctx->fs); 197 } 198 199 /* 200 * This is a helper function to check the validity of the journal. 201 */ 202 struct process_block_struct { 203 e2_blkcnt_t last_block; 204 }; 205 206 static int process_journal_block(ext2_filsys fs, 207 blk64_t *block_nr, 208 e2_blkcnt_t blockcnt, 209 blk64_t ref_block EXT2FS_ATTR((unused)), 210 int ref_offset EXT2FS_ATTR((unused)), 211 void *priv_data) 212 { 213 struct process_block_struct *p; 214 blk64_t blk = *block_nr; 215 216 p = (struct process_block_struct *) priv_data; 217 218 if (!blk || blk < fs->super->s_first_data_block || 219 blk >= ext2fs_blocks_count(fs->super)) 220 return BLOCK_ABORT; 221 222 if (blockcnt >= 0) 223 p->last_block = blockcnt; 224 return 0; 225 } 226 227 static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal) 228 { 229 struct process_block_struct pb; 230 struct ext2_super_block *sb = ctx->fs->super; 231 struct ext2_super_block jsuper; 232 struct problem_context pctx; 233 struct buffer_head *bh; 234 struct inode *j_inode = NULL; 235 struct kdev_s *dev_fs = NULL, *dev_journal; 236 const char *journal_name = 0; 237 journal_t *journal = NULL; 238 errcode_t retval = 0; 239 io_manager io_ptr = 0; 240 unsigned long long start = 0; 241 int ext_journal = 0; 242 int tried_backup_jnl = 0; 243 244 clear_problem_context(&pctx); 245 246 journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal"); 247 if (!journal) { 248 return EXT2_ET_NO_MEMORY; 249 } 250 251 dev_fs = e2fsck_allocate_memory(ctx, 2*sizeof(struct kdev_s), "kdev"); 252 if (!dev_fs) { 253 retval = EXT2_ET_NO_MEMORY; 254 goto errout; 255 } 256 dev_journal = dev_fs+1; 257 258 dev_fs->k_ctx = dev_journal->k_ctx = ctx; 259 dev_fs->k_dev = K_DEV_FS; 260 dev_journal->k_dev = K_DEV_JOURNAL; 261 262 journal->j_dev = dev_journal; 263 journal->j_fs_dev = dev_fs; 264 journal->j_inode = NULL; 265 journal->j_blocksize = ctx->fs->blocksize; 266 267 if (uuid_is_null(sb->s_journal_uuid)) { 268 if (!sb->s_journal_inum) { 269 retval = EXT2_ET_BAD_INODE_NUM; 270 goto errout; 271 } 272 j_inode = e2fsck_allocate_memory(ctx, sizeof(*j_inode), 273 "journal inode"); 274 if (!j_inode) { 275 retval = EXT2_ET_NO_MEMORY; 276 goto errout; 277 } 278 279 j_inode->i_ctx = ctx; 280 j_inode->i_ino = sb->s_journal_inum; 281 282 if ((retval = ext2fs_read_inode(ctx->fs, 283 sb->s_journal_inum, 284 &j_inode->i_ext2))) { 285 try_backup_journal: 286 if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS || 287 tried_backup_jnl) 288 goto errout; 289 memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode)); 290 memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks, 291 EXT2_N_BLOCKS*4); 292 j_inode->i_ext2.i_size_high = sb->s_jnl_blocks[15]; 293 j_inode->i_ext2.i_size = sb->s_jnl_blocks[16]; 294 j_inode->i_ext2.i_links_count = 1; 295 j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600; 296 e2fsck_use_inode_shortcuts(ctx, 1); 297 ctx->stashed_ino = j_inode->i_ino; 298 ctx->stashed_inode = &j_inode->i_ext2; 299 tried_backup_jnl++; 300 } 301 if (!j_inode->i_ext2.i_links_count || 302 !LINUX_S_ISREG(j_inode->i_ext2.i_mode)) { 303 retval = EXT2_ET_NO_JOURNAL; 304 goto try_backup_journal; 305 } 306 if (EXT2_I_SIZE(&j_inode->i_ext2) / journal->j_blocksize < 307 JFS_MIN_JOURNAL_BLOCKS) { 308 retval = EXT2_ET_JOURNAL_TOO_SMALL; 309 goto try_backup_journal; 310 } 311 pb.last_block = -1; 312 retval = ext2fs_block_iterate3(ctx->fs, j_inode->i_ino, 313 BLOCK_FLAG_HOLE, 0, 314 process_journal_block, &pb); 315 if ((pb.last_block + 1) * ctx->fs->blocksize < 316 (int) EXT2_I_SIZE(&j_inode->i_ext2)) { 317 retval = EXT2_ET_JOURNAL_TOO_SMALL; 318 goto try_backup_journal; 319 } 320 if (tried_backup_jnl && !(ctx->options & E2F_OPT_READONLY)) { 321 retval = ext2fs_write_inode(ctx->fs, sb->s_journal_inum, 322 &j_inode->i_ext2); 323 if (retval) 324 goto errout; 325 } 326 327 journal->j_maxlen = EXT2_I_SIZE(&j_inode->i_ext2) / 328 journal->j_blocksize; 329 330 #ifdef USE_INODE_IO 331 retval = ext2fs_inode_io_intern2(ctx->fs, sb->s_journal_inum, 332 &j_inode->i_ext2, 333 &journal_name); 334 if (retval) 335 goto errout; 336 337 io_ptr = inode_io_manager; 338 #else 339 journal->j_inode = j_inode; 340 ctx->journal_io = ctx->fs->io; 341 if ((retval = (errcode_t) journal_bmap(journal, 0, &start)) != 0) 342 goto errout; 343 #endif 344 } else { 345 ext_journal = 1; 346 if (!ctx->journal_name) { 347 char uuid[37]; 348 349 uuid_unparse(sb->s_journal_uuid, uuid); 350 ctx->journal_name = blkid_get_devname(ctx->blkid, 351 "UUID", uuid); 352 if (!ctx->journal_name) 353 ctx->journal_name = blkid_devno_to_devname(sb->s_journal_dev); 354 } 355 journal_name = ctx->journal_name; 356 357 if (!journal_name) { 358 fix_problem(ctx, PR_0_CANT_FIND_JOURNAL, &pctx); 359 retval = EXT2_ET_LOAD_EXT_JOURNAL; 360 goto errout; 361 } 362 363 jfs_debug(1, "Using journal file %s\n", journal_name); 364 io_ptr = unix_io_manager; 365 } 366 367 #if 0 368 test_io_backing_manager = io_ptr; 369 io_ptr = test_io_manager; 370 #endif 371 #ifndef USE_INODE_IO 372 if (ext_journal) 373 #endif 374 { 375 int flags = IO_FLAG_RW; 376 if (!(ctx->mount_flags & EXT2_MF_ISROOT && 377 ctx->mount_flags & EXT2_MF_READONLY)) 378 flags |= IO_FLAG_EXCLUSIVE; 379 if ((ctx->mount_flags & EXT2_MF_READONLY) && 380 (ctx->options & E2F_OPT_FORCE)) 381 flags &= ~IO_FLAG_EXCLUSIVE; 382 383 384 retval = io_ptr->open(journal_name, flags, 385 &ctx->journal_io); 386 } 387 if (retval) 388 goto errout; 389 390 io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize); 391 392 if (ext_journal) { 393 blk64_t maxlen; 394 395 if (ctx->fs->blocksize == 1024) 396 start = 1; 397 bh = getblk(dev_journal, start, ctx->fs->blocksize); 398 if (!bh) { 399 retval = EXT2_ET_NO_MEMORY; 400 goto errout; 401 } 402 ll_rw_block(READ, 1, &bh); 403 if ((retval = bh->b_err) != 0) { 404 brelse(bh); 405 goto errout; 406 } 407 memcpy(&jsuper, start ? bh->b_data : bh->b_data + 1024, 408 sizeof(jsuper)); 409 brelse(bh); 410 #ifdef WORDS_BIGENDIAN 411 if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) 412 ext2fs_swap_super(&jsuper); 413 #endif 414 if (jsuper.s_magic != EXT2_SUPER_MAGIC || 415 !(jsuper.s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { 416 fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx); 417 retval = EXT2_ET_LOAD_EXT_JOURNAL; 418 goto errout; 419 } 420 /* Make sure the journal UUID is correct */ 421 if (memcmp(jsuper.s_uuid, ctx->fs->super->s_journal_uuid, 422 sizeof(jsuper.s_uuid))) { 423 fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx); 424 retval = EXT2_ET_LOAD_EXT_JOURNAL; 425 goto errout; 426 } 427 428 maxlen = ext2fs_blocks_count(&jsuper); 429 journal->j_maxlen = (maxlen < 1ULL << 32) ? maxlen : (1ULL << 32) - 1; 430 start++; 431 } 432 433 if (!(bh = getblk(dev_journal, start, journal->j_blocksize))) { 434 retval = EXT2_ET_NO_MEMORY; 435 goto errout; 436 } 437 438 journal->j_sb_buffer = bh; 439 journal->j_superblock = (journal_superblock_t *)bh->b_data; 440 441 #ifdef USE_INODE_IO 442 if (j_inode) 443 ext2fs_free_mem(&j_inode); 444 #endif 445 446 *ret_journal = journal; 447 e2fsck_use_inode_shortcuts(ctx, 0); 448 return 0; 449 450 errout: 451 e2fsck_use_inode_shortcuts(ctx, 0); 452 if (dev_fs) 453 ext2fs_free_mem(&dev_fs); 454 if (j_inode) 455 ext2fs_free_mem(&j_inode); 456 if (journal) 457 ext2fs_free_mem(&journal); 458 return retval; 459 } 460 461 static errcode_t e2fsck_journal_fix_bad_inode(e2fsck_t ctx, 462 struct problem_context *pctx) 463 { 464 struct ext2_super_block *sb = ctx->fs->super; 465 int recover = ctx->fs->super->s_feature_incompat & 466 EXT3_FEATURE_INCOMPAT_RECOVER; 467 int has_journal = ctx->fs->super->s_feature_compat & 468 EXT3_FEATURE_COMPAT_HAS_JOURNAL; 469 470 if (has_journal || sb->s_journal_inum) { 471 /* The journal inode is bogus, remove and force full fsck */ 472 pctx->ino = sb->s_journal_inum; 473 if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) { 474 if (has_journal && sb->s_journal_inum) 475 printf("*** ext3 journal has been deleted - " 476 "filesystem is now ext2 only ***\n\n"); 477 sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL; 478 sb->s_journal_inum = 0; 479 ctx->flags |= E2F_FLAG_JOURNAL_INODE; 480 ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 481 e2fsck_clear_recover(ctx, 1); 482 return 0; 483 } 484 return EXT2_ET_BAD_INODE_NUM; 485 } else if (recover) { 486 if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) { 487 e2fsck_clear_recover(ctx, 1); 488 return 0; 489 } 490 return EXT2_ET_UNSUPP_FEATURE; 491 } 492 return 0; 493 } 494 495 #define V1_SB_SIZE 0x0024 496 static void clear_v2_journal_fields(journal_t *journal) 497 { 498 e2fsck_t ctx = journal->j_dev->k_ctx; 499 struct problem_context pctx; 500 501 clear_problem_context(&pctx); 502 503 if (!fix_problem(ctx, PR_0_CLEAR_V2_JOURNAL, &pctx)) 504 return; 505 506 memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0, 507 ctx->fs->blocksize-V1_SB_SIZE); 508 mark_buffer_dirty(journal->j_sb_buffer); 509 } 510 511 512 static errcode_t e2fsck_journal_load(journal_t *journal) 513 { 514 e2fsck_t ctx = journal->j_dev->k_ctx; 515 journal_superblock_t *jsb; 516 struct buffer_head *jbh = journal->j_sb_buffer; 517 struct problem_context pctx; 518 519 clear_problem_context(&pctx); 520 521 ll_rw_block(READ, 1, &jbh); 522 if (jbh->b_err) { 523 com_err(ctx->device_name, jbh->b_err, "%s", 524 _("reading journal superblock\n")); 525 return jbh->b_err; 526 } 527 528 jsb = journal->j_superblock; 529 /* If we don't even have JFS_MAGIC, we probably have a wrong inode */ 530 if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER)) 531 return e2fsck_journal_fix_bad_inode(ctx, &pctx); 532 533 switch (ntohl(jsb->s_header.h_blocktype)) { 534 case JFS_SUPERBLOCK_V1: 535 journal->j_format_version = 1; 536 if (jsb->s_feature_compat || 537 jsb->s_feature_incompat || 538 jsb->s_feature_ro_compat || 539 jsb->s_nr_users) 540 clear_v2_journal_fields(journal); 541 break; 542 543 case JFS_SUPERBLOCK_V2: 544 journal->j_format_version = 2; 545 if (ntohl(jsb->s_nr_users) > 1 && 546 uuid_is_null(ctx->fs->super->s_journal_uuid)) 547 clear_v2_journal_fields(journal); 548 if (ntohl(jsb->s_nr_users) > 1) { 549 fix_problem(ctx, PR_0_JOURNAL_UNSUPP_MULTIFS, &pctx); 550 return EXT2_ET_JOURNAL_UNSUPP_VERSION; 551 } 552 break; 553 554 /* 555 * These should never appear in a journal super block, so if 556 * they do, the journal is badly corrupted. 557 */ 558 case JFS_DESCRIPTOR_BLOCK: 559 case JFS_COMMIT_BLOCK: 560 case JFS_REVOKE_BLOCK: 561 return EXT2_ET_CORRUPT_SUPERBLOCK; 562 563 /* If we don't understand the superblock major type, but there 564 * is a magic number, then it is likely to be a new format we 565 * just don't understand, so leave it alone. */ 566 default: 567 return EXT2_ET_JOURNAL_UNSUPP_VERSION; 568 } 569 570 if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES)) 571 return EXT2_ET_UNSUPP_FEATURE; 572 573 if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES)) 574 return EXT2_ET_RO_UNSUPP_FEATURE; 575 576 /* We have now checked whether we know enough about the journal 577 * format to be able to proceed safely, so any other checks that 578 * fail we should attempt to recover from. */ 579 if (jsb->s_blocksize != htonl(journal->j_blocksize)) { 580 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK, 581 _("%s: no valid journal superblock found\n"), 582 ctx->device_name); 583 return EXT2_ET_CORRUPT_SUPERBLOCK; 584 } 585 586 if (ntohl(jsb->s_maxlen) < journal->j_maxlen) 587 journal->j_maxlen = ntohl(jsb->s_maxlen); 588 else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) { 589 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK, 590 _("%s: journal too short\n"), 591 ctx->device_name); 592 return EXT2_ET_CORRUPT_SUPERBLOCK; 593 } 594 595 journal->j_tail_sequence = ntohl(jsb->s_sequence); 596 journal->j_transaction_sequence = journal->j_tail_sequence; 597 journal->j_tail = ntohl(jsb->s_start); 598 journal->j_first = ntohl(jsb->s_first); 599 journal->j_last = ntohl(jsb->s_maxlen); 600 601 return 0; 602 } 603 604 static void e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb, 605 journal_t *journal) 606 { 607 char *p; 608 union { 609 uuid_t uuid; 610 __u32 val[4]; 611 } u; 612 __u32 new_seq = 0; 613 int i; 614 615 /* Leave a valid existing V1 superblock signature alone. 616 * Anything unrecognisable we overwrite with a new V2 617 * signature. */ 618 619 if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER) || 620 jsb->s_header.h_blocktype != htonl(JFS_SUPERBLOCK_V1)) { 621 jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER); 622 jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2); 623 } 624 625 /* Zero out everything else beyond the superblock header */ 626 627 p = ((char *) jsb) + sizeof(journal_header_t); 628 memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t)); 629 630 jsb->s_blocksize = htonl(ctx->fs->blocksize); 631 jsb->s_maxlen = htonl(journal->j_maxlen); 632 jsb->s_first = htonl(1); 633 634 /* Initialize the journal sequence number so that there is "no" 635 * chance we will find old "valid" transactions in the journal. 636 * This avoids the need to zero the whole journal (slow to do, 637 * and risky when we are just recovering the filesystem). 638 */ 639 uuid_generate(u.uuid); 640 for (i = 0; i < 4; i ++) 641 new_seq ^= u.val[i]; 642 jsb->s_sequence = htonl(new_seq); 643 644 mark_buffer_dirty(journal->j_sb_buffer); 645 ll_rw_block(WRITE, 1, &journal->j_sb_buffer); 646 } 647 648 static errcode_t e2fsck_journal_fix_corrupt_super(e2fsck_t ctx, 649 journal_t *journal, 650 struct problem_context *pctx) 651 { 652 struct ext2_super_block *sb = ctx->fs->super; 653 int recover = ctx->fs->super->s_feature_incompat & 654 EXT3_FEATURE_INCOMPAT_RECOVER; 655 656 if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) { 657 if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) { 658 e2fsck_journal_reset_super(ctx, journal->j_superblock, 659 journal); 660 journal->j_transaction_sequence = 1; 661 e2fsck_clear_recover(ctx, recover); 662 return 0; 663 } 664 return EXT2_ET_CORRUPT_SUPERBLOCK; 665 } else if (e2fsck_journal_fix_bad_inode(ctx, pctx)) 666 return EXT2_ET_CORRUPT_SUPERBLOCK; 667 668 return 0; 669 } 670 671 static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal, 672 int reset, int drop) 673 { 674 journal_superblock_t *jsb; 675 676 if (drop) 677 mark_buffer_clean(journal->j_sb_buffer); 678 else if (!(ctx->options & E2F_OPT_READONLY)) { 679 jsb = journal->j_superblock; 680 jsb->s_sequence = htonl(journal->j_transaction_sequence); 681 if (reset) 682 jsb->s_start = 0; /* this marks the journal as empty */ 683 mark_buffer_dirty(journal->j_sb_buffer); 684 } 685 brelse(journal->j_sb_buffer); 686 687 if (ctx->journal_io) { 688 if (ctx->fs && ctx->fs->io != ctx->journal_io) 689 io_channel_close(ctx->journal_io); 690 ctx->journal_io = 0; 691 } 692 693 #ifndef USE_INODE_IO 694 if (journal->j_inode) 695 ext2fs_free_mem(&journal->j_inode); 696 #endif 697 if (journal->j_fs_dev) 698 ext2fs_free_mem(&journal->j_fs_dev); 699 ext2fs_free_mem(&journal); 700 } 701 702 /* 703 * This function makes sure that the superblock fields regarding the 704 * journal are consistent. 705 */ 706 errcode_t e2fsck_check_ext3_journal(e2fsck_t ctx) 707 { 708 struct ext2_super_block *sb = ctx->fs->super; 709 journal_t *journal; 710 int recover = ctx->fs->super->s_feature_incompat & 711 EXT3_FEATURE_INCOMPAT_RECOVER; 712 struct problem_context pctx; 713 problem_t problem; 714 int reset = 0, force_fsck = 0; 715 errcode_t retval; 716 717 /* If we don't have any journal features, don't do anything more */ 718 if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) && 719 !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 && 720 uuid_is_null(sb->s_journal_uuid)) 721 return 0; 722 723 clear_problem_context(&pctx); 724 pctx.num = sb->s_journal_inum; 725 726 retval = e2fsck_get_journal(ctx, &journal); 727 if (retval) { 728 if ((retval == EXT2_ET_BAD_INODE_NUM) || 729 (retval == EXT2_ET_BAD_BLOCK_NUM) || 730 (retval == EXT2_ET_JOURNAL_TOO_SMALL) || 731 (retval == EXT2_ET_NO_JOURNAL)) 732 return e2fsck_journal_fix_bad_inode(ctx, &pctx); 733 return retval; 734 } 735 736 retval = e2fsck_journal_load(journal); 737 if (retval) { 738 if ((retval == EXT2_ET_CORRUPT_SUPERBLOCK) || 739 ((retval == EXT2_ET_UNSUPP_FEATURE) && 740 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_INCOMPAT, 741 &pctx))) || 742 ((retval == EXT2_ET_RO_UNSUPP_FEATURE) && 743 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_ROCOMPAT, 744 &pctx))) || 745 ((retval == EXT2_ET_JOURNAL_UNSUPP_VERSION) && 746 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_VERSION, &pctx)))) 747 retval = e2fsck_journal_fix_corrupt_super(ctx, journal, 748 &pctx); 749 e2fsck_journal_release(ctx, journal, 0, 1); 750 return retval; 751 } 752 753 /* 754 * We want to make the flags consistent here. We will not leave with 755 * needs_recovery set but has_journal clear. We can't get in a loop 756 * with -y, -n, or -p, only if a user isn't making up their mind. 757 */ 758 no_has_journal: 759 if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) { 760 recover = sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER; 761 pctx.str = "inode"; 762 if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) { 763 if (recover && 764 !fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx)) 765 goto no_has_journal; 766 /* 767 * Need a full fsck if we are releasing a 768 * journal stored on a reserved inode. 769 */ 770 force_fsck = recover || 771 (sb->s_journal_inum < EXT2_FIRST_INODE(sb)); 772 /* Clear all of the journal fields */ 773 sb->s_journal_inum = 0; 774 sb->s_journal_dev = 0; 775 memset(sb->s_journal_uuid, 0, 776 sizeof(sb->s_journal_uuid)); 777 e2fsck_clear_recover(ctx, force_fsck); 778 } else if (!(ctx->options & E2F_OPT_READONLY)) { 779 sb->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL; 780 ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 781 ext2fs_mark_super_dirty(ctx->fs); 782 } 783 } 784 785 if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL && 786 !(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) && 787 journal->j_superblock->s_start != 0) { 788 /* Print status information */ 789 fix_problem(ctx, PR_0_JOURNAL_RECOVERY_CLEAR, &pctx); 790 if (ctx->superblock) 791 problem = PR_0_JOURNAL_RUN_DEFAULT; 792 else 793 problem = PR_0_JOURNAL_RUN; 794 if (fix_problem(ctx, problem, &pctx)) { 795 ctx->options |= E2F_OPT_FORCE; 796 sb->s_feature_incompat |= 797 EXT3_FEATURE_INCOMPAT_RECOVER; 798 ext2fs_mark_super_dirty(ctx->fs); 799 } else if (fix_problem(ctx, 800 PR_0_JOURNAL_RESET_JOURNAL, &pctx)) { 801 reset = 1; 802 sb->s_state &= ~EXT2_VALID_FS; 803 ext2fs_mark_super_dirty(ctx->fs); 804 } 805 /* 806 * If the user answers no to the above question, we 807 * ignore the fact that journal apparently has data; 808 * accidentally replaying over valid data would be far 809 * worse than skipping a questionable recovery. 810 * 811 * XXX should we abort with a fatal error here? What 812 * will the ext3 kernel code do if a filesystem with 813 * !NEEDS_RECOVERY but with a non-zero 814 * journal->j_superblock->s_start is mounted? 815 */ 816 } 817 818 /* 819 * If we don't need to do replay the journal, check to see if 820 * the journal's errno is set; if so, we need to mark the file 821 * system as being corrupt and clear the journal's s_errno. 822 */ 823 if (!(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) && 824 journal->j_superblock->s_errno) { 825 ctx->fs->super->s_state |= EXT2_ERROR_FS; 826 ext2fs_mark_super_dirty(ctx->fs); 827 journal->j_superblock->s_errno = 0; 828 mark_buffer_dirty(journal->j_sb_buffer); 829 } 830 831 e2fsck_journal_release(ctx, journal, reset, 0); 832 return retval; 833 } 834 835 static errcode_t recover_ext3_journal(e2fsck_t ctx) 836 { 837 struct problem_context pctx; 838 journal_t *journal; 839 errcode_t retval; 840 841 clear_problem_context(&pctx); 842 843 journal_init_revoke_caches(); 844 retval = e2fsck_get_journal(ctx, &journal); 845 if (retval) 846 return retval; 847 848 retval = e2fsck_journal_load(journal); 849 if (retval) 850 goto errout; 851 852 retval = journal_init_revoke(journal, 1024); 853 if (retval) 854 goto errout; 855 856 retval = -journal_recover(journal); 857 if (retval) 858 goto errout; 859 860 if (journal->j_failed_commit) { 861 pctx.ino = journal->j_failed_commit; 862 fix_problem(ctx, PR_0_JNL_TXN_CORRUPT, &pctx); 863 journal->j_superblock->s_errno = -EINVAL; 864 mark_buffer_dirty(journal->j_sb_buffer); 865 } 866 867 errout: 868 journal_destroy_revoke(journal); 869 journal_destroy_revoke_caches(); 870 e2fsck_journal_release(ctx, journal, 1, 0); 871 return retval; 872 } 873 874 errcode_t e2fsck_run_ext3_journal(e2fsck_t ctx) 875 { 876 io_manager io_ptr = ctx->fs->io->manager; 877 int blocksize = ctx->fs->blocksize; 878 errcode_t retval, recover_retval; 879 io_stats stats = 0; 880 unsigned long long kbytes_written = 0; 881 882 printf(_("%s: recovering journal\n"), ctx->device_name); 883 if (ctx->options & E2F_OPT_READONLY) { 884 printf(_("%s: won't do journal recovery while read-only\n"), 885 ctx->device_name); 886 return EXT2_ET_FILE_RO; 887 } 888 889 if (ctx->fs->flags & EXT2_FLAG_DIRTY) 890 ext2fs_flush(ctx->fs); /* Force out any modifications */ 891 892 recover_retval = recover_ext3_journal(ctx); 893 894 /* 895 * Reload the filesystem context to get up-to-date data from disk 896 * because journal recovery will change the filesystem under us. 897 */ 898 if (ctx->fs->super->s_kbytes_written && 899 ctx->fs->io->manager->get_stats) 900 ctx->fs->io->manager->get_stats(ctx->fs->io, &stats); 901 if (stats && stats->bytes_written) 902 kbytes_written = stats->bytes_written >> 10; 903 904 ext2fs_mmp_stop(ctx->fs); 905 ext2fs_free(ctx->fs); 906 retval = ext2fs_open(ctx->filesystem_name, EXT2_FLAG_RW, 907 ctx->superblock, blocksize, io_ptr, 908 &ctx->fs); 909 if (retval) { 910 com_err(ctx->program_name, retval, 911 _("while trying to re-open %s"), 912 ctx->device_name); 913 fatal_error(ctx, 0); 914 } 915 ctx->fs->priv_data = ctx; 916 ctx->fs->now = ctx->now; 917 ctx->fs->flags |= EXT2_FLAG_MASTER_SB_ONLY; 918 ctx->fs->super->s_kbytes_written += kbytes_written; 919 920 /* Set the superblock flags */ 921 e2fsck_clear_recover(ctx, recover_retval != 0); 922 923 /* 924 * Do one last sanity check, and propagate journal->s_errno to 925 * the EXT2_ERROR_FS flag in the fs superblock if needed. 926 */ 927 retval = e2fsck_check_ext3_journal(ctx); 928 return retval ? retval : recover_retval; 929 } 930 931 /* 932 * This function will move the journal inode from a visible file in 933 * the filesystem directory hierarchy to the reserved inode if necessary. 934 */ 935 static const char * const journal_names[] = { 936 ".journal", "journal", ".journal.dat", "journal.dat", 0 }; 937 938 void e2fsck_move_ext3_journal(e2fsck_t ctx) 939 { 940 struct ext2_super_block *sb = ctx->fs->super; 941 struct problem_context pctx; 942 struct ext2_inode inode; 943 ext2_filsys fs = ctx->fs; 944 ext2_ino_t ino; 945 errcode_t retval; 946 const char * const * cpp; 947 dgrp_t group; 948 int mount_flags; 949 950 clear_problem_context(&pctx); 951 952 /* 953 * If the filesystem is opened read-only, or there is no 954 * journal, then do nothing. 955 */ 956 if ((ctx->options & E2F_OPT_READONLY) || 957 (sb->s_journal_inum == 0) || 958 !(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 959 return; 960 961 /* 962 * Read in the journal inode 963 */ 964 if (ext2fs_read_inode(fs, sb->s_journal_inum, &inode) != 0) 965 return; 966 967 /* 968 * If it's necessary to backup the journal inode, do so. 969 */ 970 if ((sb->s_jnl_backup_type == 0) || 971 ((sb->s_jnl_backup_type == EXT3_JNL_BACKUP_BLOCKS) && 972 memcmp(inode.i_block, sb->s_jnl_blocks, EXT2_N_BLOCKS*4))) { 973 if (fix_problem(ctx, PR_0_BACKUP_JNL, &pctx)) { 974 memcpy(sb->s_jnl_blocks, inode.i_block, 975 EXT2_N_BLOCKS*4); 976 sb->s_jnl_blocks[15] = inode.i_size_high; 977 sb->s_jnl_blocks[16] = inode.i_size; 978 sb->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS; 979 ext2fs_mark_super_dirty(fs); 980 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 981 } 982 } 983 984 /* 985 * If the journal is already the hidden inode, then do nothing 986 */ 987 if (sb->s_journal_inum == EXT2_JOURNAL_INO) 988 return; 989 990 /* 991 * The journal inode had better have only one link and not be readable. 992 */ 993 if (inode.i_links_count != 1) 994 return; 995 996 /* 997 * If the filesystem is mounted, or we can't tell whether 998 * or not it's mounted, do nothing. 999 */ 1000 retval = ext2fs_check_if_mounted(ctx->filesystem_name, &mount_flags); 1001 if (retval || (mount_flags & EXT2_MF_MOUNTED)) 1002 return; 1003 1004 /* 1005 * If we can't find the name of the journal inode, then do 1006 * nothing. 1007 */ 1008 for (cpp = journal_names; *cpp; cpp++) { 1009 retval = ext2fs_lookup(fs, EXT2_ROOT_INO, *cpp, 1010 strlen(*cpp), 0, &ino); 1011 if ((retval == 0) && (ino == sb->s_journal_inum)) 1012 break; 1013 } 1014 if (*cpp == 0) 1015 return; 1016 1017 /* We need the inode bitmap to be loaded */ 1018 retval = ext2fs_read_bitmaps(fs); 1019 if (retval) 1020 return; 1021 1022 pctx.str = *cpp; 1023 if (!fix_problem(ctx, PR_0_MOVE_JOURNAL, &pctx)) 1024 return; 1025 1026 /* 1027 * OK, we've done all the checks, let's actually move the 1028 * journal inode. Errors at this point mean we need to force 1029 * an ext2 filesystem check. 1030 */ 1031 if ((retval = ext2fs_unlink(fs, EXT2_ROOT_INO, *cpp, ino, 0)) != 0) 1032 goto err_out; 1033 if ((retval = ext2fs_write_inode(fs, EXT2_JOURNAL_INO, &inode)) != 0) 1034 goto err_out; 1035 sb->s_journal_inum = EXT2_JOURNAL_INO; 1036 ext2fs_mark_super_dirty(fs); 1037 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 1038 inode.i_links_count = 0; 1039 inode.i_dtime = ctx->now; 1040 if ((retval = ext2fs_write_inode(fs, ino, &inode)) != 0) 1041 goto err_out; 1042 1043 group = ext2fs_group_of_ino(fs, ino); 1044 ext2fs_unmark_inode_bitmap2(fs->inode_map, ino); 1045 ext2fs_mark_ib_dirty(fs); 1046 ext2fs_bg_free_inodes_count_set(fs, group, ext2fs_bg_free_inodes_count(fs, group) + 1); 1047 ext2fs_group_desc_csum_set(fs, group); 1048 fs->super->s_free_inodes_count++; 1049 return; 1050 1051 err_out: 1052 pctx.errcode = retval; 1053 fix_problem(ctx, PR_0_ERR_MOVE_JOURNAL, &pctx); 1054 fs->super->s_state &= ~EXT2_VALID_FS; 1055 ext2fs_mark_super_dirty(fs); 1056 return; 1057 } 1058 1059 /* 1060 * This function makes sure the superblock hint for the external 1061 * journal is correct. 1062 */ 1063 int e2fsck_fix_ext3_journal_hint(e2fsck_t ctx) 1064 { 1065 struct ext2_super_block *sb = ctx->fs->super; 1066 struct problem_context pctx; 1067 char uuid[37], *journal_name; 1068 struct stat st; 1069 1070 if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) || 1071 uuid_is_null(sb->s_journal_uuid)) 1072 return 0; 1073 1074 uuid_unparse(sb->s_journal_uuid, uuid); 1075 journal_name = blkid_get_devname(ctx->blkid, "UUID", uuid); 1076 if (!journal_name) 1077 return 0; 1078 1079 if (stat(journal_name, &st) < 0) { 1080 free(journal_name); 1081 return 0; 1082 } 1083 1084 if (st.st_rdev != sb->s_journal_dev) { 1085 clear_problem_context(&pctx); 1086 pctx.num = st.st_rdev; 1087 if (fix_problem(ctx, PR_0_EXTERNAL_JOURNAL_HINT, &pctx)) { 1088 sb->s_journal_dev = st.st_rdev; 1089 ext2fs_mark_super_dirty(ctx->fs); 1090 } 1091 } 1092 1093 free(journal_name); 1094 return 0; 1095 } 1096
