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 /* 802 * If we don't need to do replay the journal, check to see if 803 * the journal's errno is set; if so, we need to mark the file 804 * system as being corrupt and clear the journal's s_errno. 805 */ 806 if (!(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) && 807 journal->j_superblock->s_errno) { 808 ctx->fs->super->s_state |= EXT2_ERROR_FS; 809 ext2fs_mark_super_dirty(ctx->fs); 810 journal->j_superblock->s_errno = 0; 811 mark_buffer_dirty(journal->j_sb_buffer); 812 } 813 814 e2fsck_journal_release(ctx, journal, reset, 0); 815 return retval; 816 } 817 818 static errcode_t recover_ext3_journal(e2fsck_t ctx) 819 { 820 struct problem_context pctx; 821 journal_t *journal; 822 int retval; 823 824 clear_problem_context(&pctx); 825 826 journal_init_revoke_caches(); 827 retval = e2fsck_get_journal(ctx, &journal); 828 if (retval) 829 return retval; 830 831 retval = e2fsck_journal_load(journal); 832 if (retval) 833 goto errout; 834 835 retval = journal_init_revoke(journal, 1024); 836 if (retval) 837 goto errout; 838 839 retval = -journal_recover(journal); 840 if (retval) 841 goto errout; 842 843 if (journal->j_failed_commit) { 844 pctx.ino = journal->j_failed_commit; 845 fix_problem(ctx, PR_0_JNL_TXN_CORRUPT, &pctx); 846 journal->j_superblock->s_errno = -EINVAL; 847 mark_buffer_dirty(journal->j_sb_buffer); 848 } 849 850 errout: 851 journal_destroy_revoke(journal); 852 journal_destroy_revoke_caches(); 853 e2fsck_journal_release(ctx, journal, 1, 0); 854 return retval; 855 } 856 857 int e2fsck_run_ext3_journal(e2fsck_t ctx) 858 { 859 io_manager io_ptr = ctx->fs->io->manager; 860 int blocksize = ctx->fs->blocksize; 861 errcode_t retval, recover_retval; 862 io_stats stats = 0; 863 unsigned long long kbytes_written = 0; 864 865 printf(_("%s: recovering journal\n"), ctx->device_name); 866 if (ctx->options & E2F_OPT_READONLY) { 867 printf(_("%s: won't do journal recovery while read-only\n"), 868 ctx->device_name); 869 return EXT2_ET_FILE_RO; 870 } 871 872 if (ctx->fs->flags & EXT2_FLAG_DIRTY) 873 ext2fs_flush(ctx->fs); /* Force out any modifications */ 874 875 recover_retval = recover_ext3_journal(ctx); 876 877 /* 878 * Reload the filesystem context to get up-to-date data from disk 879 * because journal recovery will change the filesystem under us. 880 */ 881 if (ctx->fs->super->s_kbytes_written && 882 ctx->fs->io->manager->get_stats) 883 ctx->fs->io->manager->get_stats(ctx->fs->io, &stats); 884 if (stats && stats->bytes_written) 885 kbytes_written = stats->bytes_written >> 10; 886 ext2fs_free(ctx->fs); 887 retval = ext2fs_open(ctx->filesystem_name, EXT2_FLAG_RW, 888 ctx->superblock, blocksize, io_ptr, 889 &ctx->fs); 890 if (retval) { 891 com_err(ctx->program_name, retval, 892 _("while trying to re-open %s"), 893 ctx->device_name); 894 fatal_error(ctx, 0); 895 } 896 ctx->fs->priv_data = ctx; 897 ctx->fs->now = ctx->now; 898 ctx->fs->flags |= EXT2_FLAG_MASTER_SB_ONLY; 899 ctx->fs->super->s_kbytes_written += kbytes_written; 900 901 /* Set the superblock flags */ 902 e2fsck_clear_recover(ctx, recover_retval); 903 904 /* 905 * Do one last sanity check, and propagate journal->s_errno to 906 * the EXT2_ERROR_FS flag in the fs superblock if needed. 907 */ 908 retval = e2fsck_check_ext3_journal(ctx); 909 return retval ? retval : recover_retval; 910 } 911 912 /* 913 * This function will move the journal inode from a visible file in 914 * the filesystem directory hierarchy to the reserved inode if necessary. 915 */ 916 static const char * const journal_names[] = { 917 ".journal", "journal", ".journal.dat", "journal.dat", 0 }; 918 919 void e2fsck_move_ext3_journal(e2fsck_t ctx) 920 { 921 struct ext2_super_block *sb = ctx->fs->super; 922 struct problem_context pctx; 923 struct ext2_inode inode; 924 ext2_filsys fs = ctx->fs; 925 ext2_ino_t ino; 926 errcode_t retval; 927 const char * const * cpp; 928 int group, mount_flags; 929 930 clear_problem_context(&pctx); 931 932 /* 933 * If the filesystem is opened read-only, or there is no 934 * journal, then do nothing. 935 */ 936 if ((ctx->options & E2F_OPT_READONLY) || 937 (sb->s_journal_inum == 0) || 938 !(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 939 return; 940 941 /* 942 * Read in the journal inode 943 */ 944 if (ext2fs_read_inode(fs, sb->s_journal_inum, &inode) != 0) 945 return; 946 947 /* 948 * If it's necessary to backup the journal inode, do so. 949 */ 950 if ((sb->s_jnl_backup_type == 0) || 951 ((sb->s_jnl_backup_type == EXT3_JNL_BACKUP_BLOCKS) && 952 memcmp(inode.i_block, sb->s_jnl_blocks, EXT2_N_BLOCKS*4))) { 953 if (fix_problem(ctx, PR_0_BACKUP_JNL, &pctx)) { 954 memcpy(sb->s_jnl_blocks, inode.i_block, 955 EXT2_N_BLOCKS*4); 956 sb->s_jnl_blocks[16] = inode.i_size; 957 sb->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS; 958 ext2fs_mark_super_dirty(fs); 959 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 960 } 961 } 962 963 /* 964 * If the journal is already the hidden inode, then do nothing 965 */ 966 if (sb->s_journal_inum == EXT2_JOURNAL_INO) 967 return; 968 969 /* 970 * The journal inode had better have only one link and not be readable. 971 */ 972 if (inode.i_links_count != 1) 973 return; 974 975 /* 976 * If the filesystem is mounted, or we can't tell whether 977 * or not it's mounted, do nothing. 978 */ 979 retval = ext2fs_check_if_mounted(ctx->filesystem_name, &mount_flags); 980 if (retval || (mount_flags & EXT2_MF_MOUNTED)) 981 return; 982 983 /* 984 * If we can't find the name of the journal inode, then do 985 * nothing. 986 */ 987 for (cpp = journal_names; *cpp; cpp++) { 988 retval = ext2fs_lookup(fs, EXT2_ROOT_INO, *cpp, 989 strlen(*cpp), 0, &ino); 990 if ((retval == 0) && (ino == sb->s_journal_inum)) 991 break; 992 } 993 if (*cpp == 0) 994 return; 995 996 /* We need the inode bitmap to be loaded */ 997 retval = ext2fs_read_bitmaps(fs); 998 if (retval) 999 return; 1000 1001 pctx.str = *cpp; 1002 if (!fix_problem(ctx, PR_0_MOVE_JOURNAL, &pctx)) 1003 return; 1004 1005 /* 1006 * OK, we've done all the checks, let's actually move the 1007 * journal inode. Errors at this point mean we need to force 1008 * an ext2 filesystem check. 1009 */ 1010 if ((retval = ext2fs_unlink(fs, EXT2_ROOT_INO, *cpp, ino, 0)) != 0) 1011 goto err_out; 1012 if ((retval = ext2fs_write_inode(fs, EXT2_JOURNAL_INO, &inode)) != 0) 1013 goto err_out; 1014 sb->s_journal_inum = EXT2_JOURNAL_INO; 1015 ext2fs_mark_super_dirty(fs); 1016 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 1017 inode.i_links_count = 0; 1018 inode.i_dtime = ctx->now; 1019 if ((retval = ext2fs_write_inode(fs, ino, &inode)) != 0) 1020 goto err_out; 1021 1022 group = ext2fs_group_of_ino(fs, ino); 1023 ext2fs_unmark_inode_bitmap(fs->inode_map, ino); 1024 ext2fs_mark_ib_dirty(fs); 1025 fs->group_desc[group].bg_free_inodes_count++; 1026 ext2fs_group_desc_csum_set(fs, group); 1027 fs->super->s_free_inodes_count++; 1028 return; 1029 1030 err_out: 1031 pctx.errcode = retval; 1032 fix_problem(ctx, PR_0_ERR_MOVE_JOURNAL, &pctx); 1033 fs->super->s_state &= ~EXT2_VALID_FS; 1034 ext2fs_mark_super_dirty(fs); 1035 return; 1036 } 1037 1038 /* 1039 * This function makes sure the superblock hint for the external 1040 * journal is correct. 1041 */ 1042 int e2fsck_fix_ext3_journal_hint(e2fsck_t ctx) 1043 { 1044 struct ext2_super_block *sb = ctx->fs->super; 1045 struct problem_context pctx; 1046 char uuid[37], *journal_name; 1047 struct stat st; 1048 1049 if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) || 1050 uuid_is_null(sb->s_journal_uuid)) 1051 return 0; 1052 1053 uuid_unparse(sb->s_journal_uuid, uuid); 1054 journal_name = blkid_get_devname(ctx->blkid, "UUID", uuid); 1055 if (!journal_name) 1056 return 0; 1057 1058 if (stat(journal_name, &st) < 0) 1059 return 0; 1060 1061 if (st.st_rdev != sb->s_journal_dev) { 1062 clear_problem_context(&pctx); 1063 pctx.num = st.st_rdev; 1064 if (fix_problem(ctx, PR_0_EXTERNAL_JOURNAL_HINT, &pctx)) { 1065 sb->s_journal_dev = st.st_rdev; 1066 ext2fs_mark_super_dirty(ctx->fs); 1067 } 1068 } 1069 1070 free(journal_name); 1071 return 0; 1072 } 1073
