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 || 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, 372 IO_FLAG_RW | IO_FLAG_EXCLUSIVE, 373 &ctx->journal_io); 374 if (retval) 375 goto errout; 376 377 io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize); 378 379 if (ext_journal) { 380 if (ctx->fs->blocksize == 1024) 381 start = 1; 382 bh = getblk(dev_journal, start, ctx->fs->blocksize); 383 if (!bh) { 384 retval = EXT2_ET_NO_MEMORY; 385 goto errout; 386 } 387 ll_rw_block(READ, 1, &bh); 388 if ((retval = bh->b_err) != 0) { 389 brelse(bh); 390 goto errout; 391 } 392 memcpy(&jsuper, start ? bh->b_data : bh->b_data + 1024, 393 sizeof(jsuper)); 394 brelse(bh); 395 #ifdef WORDS_BIGENDIAN 396 if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) 397 ext2fs_swap_super(&jsuper); 398 #endif 399 if (jsuper.s_magic != EXT2_SUPER_MAGIC || 400 !(jsuper.s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { 401 fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx); 402 retval = EXT2_ET_LOAD_EXT_JOURNAL; 403 goto errout; 404 } 405 /* Make sure the journal UUID is correct */ 406 if (memcmp(jsuper.s_uuid, ctx->fs->super->s_journal_uuid, 407 sizeof(jsuper.s_uuid))) { 408 fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx); 409 retval = EXT2_ET_LOAD_EXT_JOURNAL; 410 goto errout; 411 } 412 413 journal->j_maxlen = jsuper.s_blocks_count; 414 start++; 415 } 416 417 if (!(bh = getblk(dev_journal, start, journal->j_blocksize))) { 418 retval = EXT2_ET_NO_MEMORY; 419 goto errout; 420 } 421 422 journal->j_sb_buffer = bh; 423 journal->j_superblock = (journal_superblock_t *)bh->b_data; 424 425 #ifdef USE_INODE_IO 426 if (j_inode) 427 ext2fs_free_mem(&j_inode); 428 #endif 429 430 *ret_journal = journal; 431 e2fsck_use_inode_shortcuts(ctx, 0); 432 return 0; 433 434 errout: 435 e2fsck_use_inode_shortcuts(ctx, 0); 436 if (dev_fs) 437 ext2fs_free_mem(&dev_fs); 438 if (j_inode) 439 ext2fs_free_mem(&j_inode); 440 if (journal) 441 ext2fs_free_mem(&journal); 442 return retval; 443 } 444 445 static errcode_t e2fsck_journal_fix_bad_inode(e2fsck_t ctx, 446 struct problem_context *pctx) 447 { 448 struct ext2_super_block *sb = ctx->fs->super; 449 int recover = ctx->fs->super->s_feature_incompat & 450 EXT3_FEATURE_INCOMPAT_RECOVER; 451 int has_journal = ctx->fs->super->s_feature_compat & 452 EXT3_FEATURE_COMPAT_HAS_JOURNAL; 453 454 if (has_journal || sb->s_journal_inum) { 455 /* The journal inode is bogus, remove and force full fsck */ 456 pctx->ino = sb->s_journal_inum; 457 if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) { 458 if (has_journal && sb->s_journal_inum) 459 printf("*** ext3 journal has been deleted - " 460 "filesystem is now ext2 only ***\n\n"); 461 sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL; 462 sb->s_journal_inum = 0; 463 ctx->flags |= E2F_FLAG_JOURNAL_INODE; 464 ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 465 e2fsck_clear_recover(ctx, 1); 466 return 0; 467 } 468 return EXT2_ET_BAD_INODE_NUM; 469 } else if (recover) { 470 if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) { 471 e2fsck_clear_recover(ctx, 1); 472 return 0; 473 } 474 return EXT2_ET_UNSUPP_FEATURE; 475 } 476 return 0; 477 } 478 479 #define V1_SB_SIZE 0x0024 480 static void clear_v2_journal_fields(journal_t *journal) 481 { 482 e2fsck_t ctx = journal->j_dev->k_ctx; 483 struct problem_context pctx; 484 485 clear_problem_context(&pctx); 486 487 if (!fix_problem(ctx, PR_0_CLEAR_V2_JOURNAL, &pctx)) 488 return; 489 490 memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0, 491 ctx->fs->blocksize-V1_SB_SIZE); 492 mark_buffer_dirty(journal->j_sb_buffer); 493 } 494 495 496 static errcode_t e2fsck_journal_load(journal_t *journal) 497 { 498 e2fsck_t ctx = journal->j_dev->k_ctx; 499 journal_superblock_t *jsb; 500 struct buffer_head *jbh = journal->j_sb_buffer; 501 struct problem_context pctx; 502 503 clear_problem_context(&pctx); 504 505 ll_rw_block(READ, 1, &jbh); 506 if (jbh->b_err) { 507 com_err(ctx->device_name, jbh->b_err, 508 _("reading journal superblock\n")); 509 return jbh->b_err; 510 } 511 512 jsb = journal->j_superblock; 513 /* If we don't even have JFS_MAGIC, we probably have a wrong inode */ 514 if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER)) 515 return e2fsck_journal_fix_bad_inode(ctx, &pctx); 516 517 switch (ntohl(jsb->s_header.h_blocktype)) { 518 case JFS_SUPERBLOCK_V1: 519 journal->j_format_version = 1; 520 if (jsb->s_feature_compat || 521 jsb->s_feature_incompat || 522 jsb->s_feature_ro_compat || 523 jsb->s_nr_users) 524 clear_v2_journal_fields(journal); 525 break; 526 527 case JFS_SUPERBLOCK_V2: 528 journal->j_format_version = 2; 529 if (ntohl(jsb->s_nr_users) > 1 && 530 uuid_is_null(ctx->fs->super->s_journal_uuid)) 531 clear_v2_journal_fields(journal); 532 if (ntohl(jsb->s_nr_users) > 1) { 533 fix_problem(ctx, PR_0_JOURNAL_UNSUPP_MULTIFS, &pctx); 534 return EXT2_ET_JOURNAL_UNSUPP_VERSION; 535 } 536 break; 537 538 /* 539 * These should never appear in a journal super block, so if 540 * they do, the journal is badly corrupted. 541 */ 542 case JFS_DESCRIPTOR_BLOCK: 543 case JFS_COMMIT_BLOCK: 544 case JFS_REVOKE_BLOCK: 545 return EXT2_ET_CORRUPT_SUPERBLOCK; 546 547 /* If we don't understand the superblock major type, but there 548 * is a magic number, then it is likely to be a new format we 549 * just don't understand, so leave it alone. */ 550 default: 551 return EXT2_ET_JOURNAL_UNSUPP_VERSION; 552 } 553 554 if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES)) 555 return EXT2_ET_UNSUPP_FEATURE; 556 557 if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES)) 558 return EXT2_ET_RO_UNSUPP_FEATURE; 559 560 /* We have now checked whether we know enough about the journal 561 * format to be able to proceed safely, so any other checks that 562 * fail we should attempt to recover from. */ 563 if (jsb->s_blocksize != htonl(journal->j_blocksize)) { 564 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK, 565 _("%s: no valid journal superblock found\n"), 566 ctx->device_name); 567 return EXT2_ET_CORRUPT_SUPERBLOCK; 568 } 569 570 if (ntohl(jsb->s_maxlen) < journal->j_maxlen) 571 journal->j_maxlen = ntohl(jsb->s_maxlen); 572 else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) { 573 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK, 574 _("%s: journal too short\n"), 575 ctx->device_name); 576 return EXT2_ET_CORRUPT_SUPERBLOCK; 577 } 578 579 journal->j_tail_sequence = ntohl(jsb->s_sequence); 580 journal->j_transaction_sequence = journal->j_tail_sequence; 581 journal->j_tail = ntohl(jsb->s_start); 582 journal->j_first = ntohl(jsb->s_first); 583 journal->j_last = ntohl(jsb->s_maxlen); 584 585 return 0; 586 } 587 588 static void e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb, 589 journal_t *journal) 590 { 591 char *p; 592 union { 593 uuid_t uuid; 594 __u32 val[4]; 595 } u; 596 __u32 new_seq = 0; 597 int i; 598 599 /* Leave a valid existing V1 superblock signature alone. 600 * Anything unrecognisable we overwrite with a new V2 601 * signature. */ 602 603 if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER) || 604 jsb->s_header.h_blocktype != htonl(JFS_SUPERBLOCK_V1)) { 605 jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER); 606 jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2); 607 } 608 609 /* Zero out everything else beyond the superblock header */ 610 611 p = ((char *) jsb) + sizeof(journal_header_t); 612 memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t)); 613 614 jsb->s_blocksize = htonl(ctx->fs->blocksize); 615 jsb->s_maxlen = htonl(journal->j_maxlen); 616 jsb->s_first = htonl(1); 617 618 /* Initialize the journal sequence number so that there is "no" 619 * chance we will find old "valid" transactions in the journal. 620 * This avoids the need to zero the whole journal (slow to do, 621 * and risky when we are just recovering the filesystem). 622 */ 623 uuid_generate(u.uuid); 624 for (i = 0; i < 4; i ++) 625 new_seq ^= u.val[i]; 626 jsb->s_sequence = htonl(new_seq); 627 628 mark_buffer_dirty(journal->j_sb_buffer); 629 ll_rw_block(WRITE, 1, &journal->j_sb_buffer); 630 } 631 632 static errcode_t e2fsck_journal_fix_corrupt_super(e2fsck_t ctx, 633 journal_t *journal, 634 struct problem_context *pctx) 635 { 636 struct ext2_super_block *sb = ctx->fs->super; 637 int recover = ctx->fs->super->s_feature_incompat & 638 EXT3_FEATURE_INCOMPAT_RECOVER; 639 640 if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) { 641 if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) { 642 e2fsck_journal_reset_super(ctx, journal->j_superblock, 643 journal); 644 journal->j_transaction_sequence = 1; 645 e2fsck_clear_recover(ctx, recover); 646 return 0; 647 } 648 return EXT2_ET_CORRUPT_SUPERBLOCK; 649 } else if (e2fsck_journal_fix_bad_inode(ctx, pctx)) 650 return EXT2_ET_CORRUPT_SUPERBLOCK; 651 652 return 0; 653 } 654 655 static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal, 656 int reset, int drop) 657 { 658 journal_superblock_t *jsb; 659 660 if (drop) 661 mark_buffer_clean(journal->j_sb_buffer); 662 else if (!(ctx->options & E2F_OPT_READONLY)) { 663 jsb = journal->j_superblock; 664 jsb->s_sequence = htonl(journal->j_transaction_sequence); 665 if (reset) 666 jsb->s_start = 0; /* this marks the journal as empty */ 667 mark_buffer_dirty(journal->j_sb_buffer); 668 } 669 brelse(journal->j_sb_buffer); 670 671 if (ctx->journal_io) { 672 if (ctx->fs && ctx->fs->io != ctx->journal_io) 673 io_channel_close(ctx->journal_io); 674 ctx->journal_io = 0; 675 } 676 677 #ifndef USE_INODE_IO 678 if (journal->j_inode) 679 ext2fs_free_mem(&journal->j_inode); 680 #endif 681 if (journal->j_fs_dev) 682 ext2fs_free_mem(&journal->j_fs_dev); 683 ext2fs_free_mem(&journal); 684 } 685 686 /* 687 * This function makes sure that the superblock fields regarding the 688 * journal are consistent. 689 */ 690 int e2fsck_check_ext3_journal(e2fsck_t ctx) 691 { 692 struct ext2_super_block *sb = ctx->fs->super; 693 journal_t *journal; 694 int recover = ctx->fs->super->s_feature_incompat & 695 EXT3_FEATURE_INCOMPAT_RECOVER; 696 struct problem_context pctx; 697 problem_t problem; 698 int reset = 0, force_fsck = 0; 699 int retval; 700 701 /* If we don't have any journal features, don't do anything more */ 702 if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) && 703 !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 && 704 uuid_is_null(sb->s_journal_uuid)) 705 return 0; 706 707 clear_problem_context(&pctx); 708 pctx.num = sb->s_journal_inum; 709 710 retval = e2fsck_get_journal(ctx, &journal); 711 if (retval) { 712 if ((retval == EXT2_ET_BAD_INODE_NUM) || 713 (retval == EXT2_ET_BAD_BLOCK_NUM) || 714 (retval == EXT2_ET_JOURNAL_TOO_SMALL) || 715 (retval == EXT2_ET_NO_JOURNAL)) 716 return e2fsck_journal_fix_bad_inode(ctx, &pctx); 717 return retval; 718 } 719 720 retval = e2fsck_journal_load(journal); 721 if (retval) { 722 if ((retval == EXT2_ET_CORRUPT_SUPERBLOCK) || 723 ((retval == EXT2_ET_UNSUPP_FEATURE) && 724 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_INCOMPAT, 725 &pctx))) || 726 ((retval == EXT2_ET_RO_UNSUPP_FEATURE) && 727 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_ROCOMPAT, 728 &pctx))) || 729 ((retval == EXT2_ET_JOURNAL_UNSUPP_VERSION) && 730 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_VERSION, &pctx)))) 731 retval = e2fsck_journal_fix_corrupt_super(ctx, journal, 732 &pctx); 733 e2fsck_journal_release(ctx, journal, 0, 1); 734 return retval; 735 } 736 737 /* 738 * We want to make the flags consistent here. We will not leave with 739 * needs_recovery set but has_journal clear. We can't get in a loop 740 * with -y, -n, or -p, only if a user isn't making up their mind. 741 */ 742 no_has_journal: 743 if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) { 744 recover = sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER; 745 pctx.str = "inode"; 746 if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) { 747 if (recover && 748 !fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx)) 749 goto no_has_journal; 750 /* 751 * Need a full fsck if we are releasing a 752 * journal stored on a reserved inode. 753 */ 754 force_fsck = recover || 755 (sb->s_journal_inum < EXT2_FIRST_INODE(sb)); 756 /* Clear all of the journal fields */ 757 sb->s_journal_inum = 0; 758 sb->s_journal_dev = 0; 759 memset(sb->s_journal_uuid, 0, 760 sizeof(sb->s_journal_uuid)); 761 e2fsck_clear_recover(ctx, force_fsck); 762 } else if (!(ctx->options & E2F_OPT_READONLY)) { 763 sb->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL; 764 ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 765 ext2fs_mark_super_dirty(ctx->fs); 766 } 767 } 768 769 if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL && 770 !(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) && 771 journal->j_superblock->s_start != 0) { 772 /* Print status information */ 773 fix_problem(ctx, PR_0_JOURNAL_RECOVERY_CLEAR, &pctx); 774 if (ctx->superblock) 775 problem = PR_0_JOURNAL_RUN_DEFAULT; 776 else 777 problem = PR_0_JOURNAL_RUN; 778 if (fix_problem(ctx, problem, &pctx)) { 779 ctx->options |= E2F_OPT_FORCE; 780 sb->s_feature_incompat |= 781 EXT3_FEATURE_INCOMPAT_RECOVER; 782 ext2fs_mark_super_dirty(ctx->fs); 783 } else if (fix_problem(ctx, 784 PR_0_JOURNAL_RESET_JOURNAL, &pctx)) { 785 reset = 1; 786 sb->s_state &= ~EXT2_VALID_FS; 787 ext2fs_mark_super_dirty(ctx->fs); 788 } 789 /* 790 * If the user answers no to the above question, we 791 * ignore the fact that journal apparently has data; 792 * accidentally replaying over valid data would be far 793 * worse than skipping a questionable recovery. 794 * 795 * XXX should we abort with a fatal error here? What 796 * will the ext3 kernel code do if a filesystem with 797 * !NEEDS_RECOVERY but with a non-zero 798 * journal->j_superblock->s_start is mounted? 799 */ 800 } 801 802 /* 803 * If we don't need to do replay the journal, check to see if 804 * the journal's errno is set; if so, we need to mark the file 805 * system as being corrupt and clear the journal's s_errno. 806 */ 807 if (!(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) && 808 journal->j_superblock->s_errno) { 809 ctx->fs->super->s_state |= EXT2_ERROR_FS; 810 ext2fs_mark_super_dirty(ctx->fs); 811 journal->j_superblock->s_errno = 0; 812 mark_buffer_dirty(journal->j_sb_buffer); 813 } 814 815 e2fsck_journal_release(ctx, journal, reset, 0); 816 return retval; 817 } 818 819 static errcode_t recover_ext3_journal(e2fsck_t ctx) 820 { 821 struct problem_context pctx; 822 journal_t *journal; 823 int retval; 824 825 clear_problem_context(&pctx); 826 827 journal_init_revoke_caches(); 828 retval = e2fsck_get_journal(ctx, &journal); 829 if (retval) 830 return retval; 831 832 retval = e2fsck_journal_load(journal); 833 if (retval) 834 goto errout; 835 836 retval = journal_init_revoke(journal, 1024); 837 if (retval) 838 goto errout; 839 840 retval = -journal_recover(journal); 841 if (retval) 842 goto errout; 843 844 if (journal->j_failed_commit) { 845 pctx.ino = journal->j_failed_commit; 846 fix_problem(ctx, PR_0_JNL_TXN_CORRUPT, &pctx); 847 journal->j_superblock->s_errno = -EINVAL; 848 mark_buffer_dirty(journal->j_sb_buffer); 849 } 850 851 errout: 852 journal_destroy_revoke(journal); 853 journal_destroy_revoke_caches(); 854 e2fsck_journal_release(ctx, journal, 1, 0); 855 return retval; 856 } 857 858 int e2fsck_run_ext3_journal(e2fsck_t ctx) 859 { 860 io_manager io_ptr = ctx->fs->io->manager; 861 int blocksize = ctx->fs->blocksize; 862 errcode_t retval, recover_retval; 863 io_stats stats = 0; 864 unsigned long long kbytes_written = 0; 865 866 printf(_("%s: recovering journal\n"), ctx->device_name); 867 if (ctx->options & E2F_OPT_READONLY) { 868 printf(_("%s: won't do journal recovery while read-only\n"), 869 ctx->device_name); 870 return EXT2_ET_FILE_RO; 871 } 872 873 if (ctx->fs->flags & EXT2_FLAG_DIRTY) 874 ext2fs_flush(ctx->fs); /* Force out any modifications */ 875 876 recover_retval = recover_ext3_journal(ctx); 877 878 /* 879 * Reload the filesystem context to get up-to-date data from disk 880 * because journal recovery will change the filesystem under us. 881 */ 882 if (ctx->fs->super->s_kbytes_written && 883 ctx->fs->io->manager->get_stats) 884 ctx->fs->io->manager->get_stats(ctx->fs->io, &stats); 885 if (stats && stats->bytes_written) 886 kbytes_written = stats->bytes_written >> 10; 887 ext2fs_free(ctx->fs); 888 retval = ext2fs_open(ctx->filesystem_name, EXT2_FLAG_RW, 889 ctx->superblock, blocksize, io_ptr, 890 &ctx->fs); 891 if (retval) { 892 com_err(ctx->program_name, retval, 893 _("while trying to re-open %s"), 894 ctx->device_name); 895 fatal_error(ctx, 0); 896 } 897 ctx->fs->priv_data = ctx; 898 ctx->fs->now = ctx->now; 899 ctx->fs->flags |= EXT2_FLAG_MASTER_SB_ONLY; 900 ctx->fs->super->s_kbytes_written += kbytes_written; 901 902 /* Set the superblock flags */ 903 e2fsck_clear_recover(ctx, recover_retval); 904 905 /* 906 * Do one last sanity check, and propagate journal->s_errno to 907 * the EXT2_ERROR_FS flag in the fs superblock if needed. 908 */ 909 retval = e2fsck_check_ext3_journal(ctx); 910 return retval ? retval : recover_retval; 911 } 912 913 /* 914 * This function will move the journal inode from a visible file in 915 * the filesystem directory hierarchy to the reserved inode if necessary. 916 */ 917 static const char * const journal_names[] = { 918 ".journal", "journal", ".journal.dat", "journal.dat", 0 }; 919 920 void e2fsck_move_ext3_journal(e2fsck_t ctx) 921 { 922 struct ext2_super_block *sb = ctx->fs->super; 923 struct problem_context pctx; 924 struct ext2_inode inode; 925 ext2_filsys fs = ctx->fs; 926 ext2_ino_t ino; 927 errcode_t retval; 928 const char * const * cpp; 929 int group, mount_flags; 930 931 clear_problem_context(&pctx); 932 933 /* 934 * If the filesystem is opened read-only, or there is no 935 * journal, then do nothing. 936 */ 937 if ((ctx->options & E2F_OPT_READONLY) || 938 (sb->s_journal_inum == 0) || 939 !(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 940 return; 941 942 /* 943 * Read in the journal inode 944 */ 945 if (ext2fs_read_inode(fs, sb->s_journal_inum, &inode) != 0) 946 return; 947 948 /* 949 * If it's necessary to backup the journal inode, do so. 950 */ 951 if ((sb->s_jnl_backup_type == 0) || 952 ((sb->s_jnl_backup_type == EXT3_JNL_BACKUP_BLOCKS) && 953 memcmp(inode.i_block, sb->s_jnl_blocks, EXT2_N_BLOCKS*4))) { 954 if (fix_problem(ctx, PR_0_BACKUP_JNL, &pctx)) { 955 memcpy(sb->s_jnl_blocks, inode.i_block, 956 EXT2_N_BLOCKS*4); 957 sb->s_jnl_blocks[16] = inode.i_size; 958 sb->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS; 959 ext2fs_mark_super_dirty(fs); 960 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 961 } 962 } 963 964 /* 965 * If the journal is already the hidden inode, then do nothing 966 */ 967 if (sb->s_journal_inum == EXT2_JOURNAL_INO) 968 return; 969 970 /* 971 * The journal inode had better have only one link and not be readable. 972 */ 973 if (inode.i_links_count != 1) 974 return; 975 976 /* 977 * If the filesystem is mounted, or we can't tell whether 978 * or not it's mounted, do nothing. 979 */ 980 retval = ext2fs_check_if_mounted(ctx->filesystem_name, &mount_flags); 981 if (retval || (mount_flags & EXT2_MF_MOUNTED)) 982 return; 983 984 /* 985 * If we can't find the name of the journal inode, then do 986 * nothing. 987 */ 988 for (cpp = journal_names; *cpp; cpp++) { 989 retval = ext2fs_lookup(fs, EXT2_ROOT_INO, *cpp, 990 strlen(*cpp), 0, &ino); 991 if ((retval == 0) && (ino == sb->s_journal_inum)) 992 break; 993 } 994 if (*cpp == 0) 995 return; 996 997 /* We need the inode bitmap to be loaded */ 998 retval = ext2fs_read_bitmaps(fs); 999 if (retval) 1000 return; 1001 1002 pctx.str = *cpp; 1003 if (!fix_problem(ctx, PR_0_MOVE_JOURNAL, &pctx)) 1004 return; 1005 1006 /* 1007 * OK, we've done all the checks, let's actually move the 1008 * journal inode. Errors at this point mean we need to force 1009 * an ext2 filesystem check. 1010 */ 1011 if ((retval = ext2fs_unlink(fs, EXT2_ROOT_INO, *cpp, ino, 0)) != 0) 1012 goto err_out; 1013 if ((retval = ext2fs_write_inode(fs, EXT2_JOURNAL_INO, &inode)) != 0) 1014 goto err_out; 1015 sb->s_journal_inum = EXT2_JOURNAL_INO; 1016 ext2fs_mark_super_dirty(fs); 1017 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 1018 inode.i_links_count = 0; 1019 inode.i_dtime = ctx->now; 1020 if ((retval = ext2fs_write_inode(fs, ino, &inode)) != 0) 1021 goto err_out; 1022 1023 group = ext2fs_group_of_ino(fs, ino); 1024 ext2fs_unmark_inode_bitmap(fs->inode_map, ino); 1025 ext2fs_mark_ib_dirty(fs); 1026 fs->group_desc[group].bg_free_inodes_count++; 1027 ext2fs_group_desc_csum_set(fs, group); 1028 fs->super->s_free_inodes_count++; 1029 return; 1030 1031 err_out: 1032 pctx.errcode = retval; 1033 fix_problem(ctx, PR_0_ERR_MOVE_JOURNAL, &pctx); 1034 fs->super->s_state &= ~EXT2_VALID_FS; 1035 ext2fs_mark_super_dirty(fs); 1036 return; 1037 } 1038 1039 /* 1040 * This function makes sure the superblock hint for the external 1041 * journal is correct. 1042 */ 1043 int e2fsck_fix_ext3_journal_hint(e2fsck_t ctx) 1044 { 1045 struct ext2_super_block *sb = ctx->fs->super; 1046 struct problem_context pctx; 1047 char uuid[37], *journal_name; 1048 struct stat st; 1049 1050 if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) || 1051 uuid_is_null(sb->s_journal_uuid)) 1052 return 0; 1053 1054 uuid_unparse(sb->s_journal_uuid, uuid); 1055 journal_name = blkid_get_devname(ctx->blkid, "UUID", uuid); 1056 if (!journal_name) 1057 return 0; 1058 1059 if (stat(journal_name, &st) < 0) 1060 return 0; 1061 1062 if (st.st_rdev != sb->s_journal_dev) { 1063 clear_problem_context(&pctx); 1064 pctx.num = st.st_rdev; 1065 if (fix_problem(ctx, PR_0_EXTERNAL_JOURNAL_HINT, &pctx)) { 1066 sb->s_journal_dev = st.st_rdev; 1067 ext2fs_mark_super_dirty(ctx->fs); 1068 } 1069 } 1070 1071 free(journal_name); 1072 return 0; 1073 } 1074
