journal.c revision 63b3913dbc0bc7cdf8a63f3bdb0c8d7d605e9a40
1/* 2 * journal.c --- code for handling the "ext3" journal 3 * 4 * Copyright (C) 2000 Andreas Dilger 5 * Copyright (C) 2000 Theodore Ts'o 6 * 7 * Parts of the code are based on fs/jfs/journal.c by Stephen C. Tweedie 8 * Copyright (C) 1999 Red Hat Software 9 * 10 * This file may be redistributed under the terms of the 11 * GNU General Public License version 2 or at your discretion 12 * any later version. 13 */ 14 15#include "config.h" 16#ifdef HAVE_SYS_MOUNT_H 17#include <sys/param.h> 18#include <sys/mount.h> 19#define MNT_FL (MS_MGC_VAL | MS_RDONLY) 20#endif 21#ifdef HAVE_SYS_STAT_H 22#include <sys/stat.h> 23#endif 24 25#define E2FSCK_INCLUDE_INLINE_FUNCS 26#include "jfs_user.h" 27#include "problem.h" 28#include "uuid/uuid.h" 29 30#ifdef CONFIG_JBD_DEBUG /* Enabled by configure --enable-jfs-debug */ 31static int bh_count = 0; 32#endif 33 34/* 35 * Define USE_INODE_IO to use the inode_io.c / fileio.c codepaths. 36 * This creates a larger static binary, and a smaller binary using 37 * shared libraries. It's also probably slightly less CPU-efficient, 38 * which is why it's not on by default. But, it's a good way of 39 * testing the functions in inode_io.c and fileio.c. 40 */ 41#undef USE_INODE_IO 42 43/* Kernel compatibility functions for handling the journal. These allow us 44 * to use the recovery.c file virtually unchanged from the kernel, so we 45 * don't have to do much to keep kernel and user recovery in sync. 46 */ 47int journal_bmap(journal_t *journal, blk64_t block, unsigned long long *phys) 48{ 49#ifdef USE_INODE_IO 50 *phys = block; 51 return 0; 52#else 53 struct inode *inode = journal->j_inode; 54 errcode_t retval; 55 blk64_t pblk; 56 57 if (!inode) { 58 *phys = block; 59 return 0; 60 } 61 62 retval= ext2fs_bmap2(inode->i_ctx->fs, inode->i_ino, 63 &inode->i_ext2, NULL, 0, block, 0, &pblk); 64 *phys = pblk; 65 return (retval); 66#endif 67} 68 69struct buffer_head *getblk(kdev_t kdev, blk64_t blocknr, int blocksize) 70{ 71 struct buffer_head *bh; 72 int bufsize = sizeof(*bh) + kdev->k_ctx->fs->blocksize - 73 sizeof(bh->b_data); 74 75 bh = e2fsck_allocate_memory(kdev->k_ctx, bufsize, "block buffer"); 76 if (!bh) 77 return NULL; 78 79#ifdef CONFIG_JBD_DEBUG 80 if (journal_enable_debug >= 3) 81 bh_count++; 82#endif 83 jfs_debug(4, "getblk for block %llu (%d bytes)(total %d)\n", 84 (unsigned long long) blocknr, blocksize, bh_count); 85 86 bh->b_ctx = kdev->k_ctx; 87 if (kdev->k_dev == K_DEV_FS) 88 bh->b_io = kdev->k_ctx->fs->io; 89 else 90 bh->b_io = kdev->k_ctx->journal_io; 91 bh->b_size = blocksize; 92 bh->b_blocknr = blocknr; 93 94 return bh; 95} 96 97void sync_blockdev(kdev_t kdev) 98{ 99 io_channel io; 100 101 if (kdev->k_dev == K_DEV_FS) 102 io = kdev->k_ctx->fs->io; 103 else 104 io = kdev->k_ctx->journal_io; 105 106 io_channel_flush(io); 107} 108 109void ll_rw_block(int rw, int nr, struct buffer_head *bhp[]) 110{ 111 int retval; 112 struct buffer_head *bh; 113 114 for (; nr > 0; --nr) { 115 bh = *bhp++; 116 if (rw == READ && !bh->b_uptodate) { 117 jfs_debug(3, "reading block %llu/%p\n", 118 bh->b_blocknr, (void *) bh); 119 retval = io_channel_read_blk64(bh->b_io, 120 bh->b_blocknr, 121 1, bh->b_data); 122 if (retval) { 123 com_err(bh->b_ctx->device_name, retval, 124 "while reading block %llu\n", 125 bh->b_blocknr); 126 bh->b_err = retval; 127 continue; 128 } 129 bh->b_uptodate = 1; 130 } else if (rw == WRITE && bh->b_dirty) { 131 jfs_debug(3, "writing block %llu/%p\n", 132 bh->b_blocknr, 133 (void *) bh); 134 retval = io_channel_write_blk64(bh->b_io, 135 bh->b_blocknr, 136 1, bh->b_data); 137 if (retval) { 138 com_err(bh->b_ctx->device_name, retval, 139 "while writing block %llu\n", 140 bh->b_blocknr); 141 bh->b_err = retval; 142 continue; 143 } 144 bh->b_dirty = 0; 145 bh->b_uptodate = 1; 146 } else { 147 jfs_debug(3, "no-op %s for block %llu\n", 148 rw == READ ? "read" : "write", 149 bh->b_blocknr); 150 } 151 } 152} 153 154void mark_buffer_dirty(struct buffer_head *bh) 155{ 156 bh->b_dirty = 1; 157} 158 159static void mark_buffer_clean(struct buffer_head * bh) 160{ 161 bh->b_dirty = 0; 162} 163 164void brelse(struct buffer_head *bh) 165{ 166 if (bh->b_dirty) 167 ll_rw_block(WRITE, 1, &bh); 168 jfs_debug(3, "freeing block %llu/%p (total %d)\n", 169 bh->b_blocknr, (void *) bh, --bh_count); 170 ext2fs_free_mem(&bh); 171} 172 173int buffer_uptodate(struct buffer_head *bh) 174{ 175 return bh->b_uptodate; 176} 177 178void mark_buffer_uptodate(struct buffer_head *bh, int val) 179{ 180 bh->b_uptodate = val; 181} 182 183void wait_on_buffer(struct buffer_head *bh) 184{ 185 if (!bh->b_uptodate) 186 ll_rw_block(READ, 1, &bh); 187} 188 189 190static void e2fsck_clear_recover(e2fsck_t ctx, int error) 191{ 192 ctx->fs->super->s_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER; 193 194 /* if we had an error doing journal recovery, we need a full fsck */ 195 if (error) 196 ctx->fs->super->s_state &= ~EXT2_VALID_FS; 197 ext2fs_mark_super_dirty(ctx->fs); 198} 199 200/* 201 * This is a helper function to check the validity of the journal. 202 */ 203struct process_block_struct { 204 e2_blkcnt_t last_block; 205}; 206 207static int process_journal_block(ext2_filsys fs, 208 blk64_t *block_nr, 209 e2_blkcnt_t blockcnt, 210 blk64_t ref_block EXT2FS_ATTR((unused)), 211 int ref_offset EXT2FS_ATTR((unused)), 212 void *priv_data) 213{ 214 struct process_block_struct *p; 215 blk64_t blk = *block_nr; 216 217 p = (struct process_block_struct *) priv_data; 218 219 if (!blk || blk < fs->super->s_first_data_block || 220 blk >= ext2fs_blocks_count(fs->super)) 221 return BLOCK_ABORT; 222 223 if (blockcnt >= 0) 224 p->last_block = blockcnt; 225 return 0; 226} 227 228static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal) 229{ 230 struct process_block_struct pb; 231 struct ext2_super_block *sb = ctx->fs->super; 232 struct ext2_super_block jsuper; 233 struct problem_context pctx; 234 struct buffer_head *bh; 235 struct inode *j_inode = NULL; 236 struct kdev_s *dev_fs = NULL, *dev_journal; 237 const char *journal_name = 0; 238 journal_t *journal = NULL; 239 errcode_t retval = 0; 240 io_manager io_ptr = 0; 241 unsigned long long start = 0; 242 int ext_journal = 0; 243 int tried_backup_jnl = 0; 244 245 clear_problem_context(&pctx); 246 247 journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal"); 248 if (!journal) { 249 return EXT2_ET_NO_MEMORY; 250 } 251 252 dev_fs = e2fsck_allocate_memory(ctx, 2*sizeof(struct kdev_s), "kdev"); 253 if (!dev_fs) { 254 retval = EXT2_ET_NO_MEMORY; 255 goto errout; 256 } 257 dev_journal = dev_fs+1; 258 259 dev_fs->k_ctx = dev_journal->k_ctx = ctx; 260 dev_fs->k_dev = K_DEV_FS; 261 dev_journal->k_dev = K_DEV_JOURNAL; 262 263 journal->j_dev = dev_journal; 264 journal->j_fs_dev = dev_fs; 265 journal->j_inode = NULL; 266 journal->j_blocksize = ctx->fs->blocksize; 267 268 if (uuid_is_null(sb->s_journal_uuid)) { 269 if (!sb->s_journal_inum) { 270 retval = EXT2_ET_BAD_INODE_NUM; 271 goto errout; 272 } 273 j_inode = e2fsck_allocate_memory(ctx, sizeof(*j_inode), 274 "journal inode"); 275 if (!j_inode) { 276 retval = EXT2_ET_NO_MEMORY; 277 goto errout; 278 } 279 280 j_inode->i_ctx = ctx; 281 j_inode->i_ino = sb->s_journal_inum; 282 283 if ((retval = ext2fs_read_inode(ctx->fs, 284 sb->s_journal_inum, 285 &j_inode->i_ext2))) { 286 try_backup_journal: 287 if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS || 288 tried_backup_jnl) 289 goto errout; 290 memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode)); 291 memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks, 292 EXT2_N_BLOCKS*4); 293 j_inode->i_ext2.i_size_high = sb->s_jnl_blocks[15]; 294 j_inode->i_ext2.i_size = sb->s_jnl_blocks[16]; 295 j_inode->i_ext2.i_links_count = 1; 296 j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600; 297 e2fsck_use_inode_shortcuts(ctx, 1); 298 ctx->stashed_ino = j_inode->i_ino; 299 ctx->stashed_inode = &j_inode->i_ext2; 300 tried_backup_jnl++; 301 } 302 if (!j_inode->i_ext2.i_links_count || 303 !LINUX_S_ISREG(j_inode->i_ext2.i_mode)) { 304 retval = EXT2_ET_NO_JOURNAL; 305 goto try_backup_journal; 306 } 307 if (EXT2_I_SIZE(&j_inode->i_ext2) / journal->j_blocksize < 308 JFS_MIN_JOURNAL_BLOCKS) { 309 retval = EXT2_ET_JOURNAL_TOO_SMALL; 310 goto try_backup_journal; 311 } 312 pb.last_block = -1; 313 retval = ext2fs_block_iterate3(ctx->fs, j_inode->i_ino, 314 BLOCK_FLAG_HOLE, 0, 315 process_journal_block, &pb); 316 if ((pb.last_block + 1) * ctx->fs->blocksize < 317 EXT2_I_SIZE(&j_inode->i_ext2)) { 318 retval = EXT2_ET_JOURNAL_TOO_SMALL; 319 goto try_backup_journal; 320 } 321 if (tried_backup_jnl && !(ctx->options & E2F_OPT_READONLY)) { 322 retval = ext2fs_write_inode(ctx->fs, sb->s_journal_inum, 323 &j_inode->i_ext2); 324 if (retval) 325 goto errout; 326 } 327 328 journal->j_maxlen = EXT2_I_SIZE(&j_inode->i_ext2) / 329 journal->j_blocksize; 330 331#ifdef USE_INODE_IO 332 retval = ext2fs_inode_io_intern2(ctx->fs, sb->s_journal_inum, 333 &j_inode->i_ext2, 334 &journal_name); 335 if (retval) 336 goto errout; 337 338 io_ptr = inode_io_manager; 339#else 340 journal->j_inode = j_inode; 341 ctx->journal_io = ctx->fs->io; 342 if ((retval = journal_bmap(journal, 0, &start)) != 0) 343 goto errout; 344#endif 345 } else { 346 ext_journal = 1; 347 if (!ctx->journal_name) { 348 char uuid[37]; 349 350 uuid_unparse(sb->s_journal_uuid, uuid); 351 ctx->journal_name = blkid_get_devname(ctx->blkid, 352 "UUID", uuid); 353 if (!ctx->journal_name) 354 ctx->journal_name = blkid_devno_to_devname(sb->s_journal_dev); 355 } 356 journal_name = ctx->journal_name; 357 358 if (!journal_name) { 359 fix_problem(ctx, PR_0_CANT_FIND_JOURNAL, &pctx); 360 retval = EXT2_ET_LOAD_EXT_JOURNAL; 361 goto errout; 362 } 363 364 jfs_debug(1, "Using journal file %s\n", journal_name); 365 io_ptr = unix_io_manager; 366 } 367 368#if 0 369 test_io_backing_manager = io_ptr; 370 io_ptr = test_io_manager; 371#endif 372#ifndef USE_INODE_IO 373 if (ext_journal) 374#endif 375 retval = io_ptr->open(journal_name, 376 IO_FLAG_RW | IO_FLAG_EXCLUSIVE, 377 &ctx->journal_io); 378 if (retval) 379 goto errout; 380 381 io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize); 382 383 if (ext_journal) { 384 if (ctx->fs->blocksize == 1024) 385 start = 1; 386 bh = getblk(dev_journal, start, ctx->fs->blocksize); 387 if (!bh) { 388 retval = EXT2_ET_NO_MEMORY; 389 goto errout; 390 } 391 ll_rw_block(READ, 1, &bh); 392 if ((retval = bh->b_err) != 0) { 393 brelse(bh); 394 goto errout; 395 } 396 memcpy(&jsuper, start ? bh->b_data : bh->b_data + 1024, 397 sizeof(jsuper)); 398 brelse(bh); 399#ifdef WORDS_BIGENDIAN 400 if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) 401 ext2fs_swap_super(&jsuper); 402#endif 403 if (jsuper.s_magic != EXT2_SUPER_MAGIC || 404 !(jsuper.s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { 405 fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx); 406 retval = EXT2_ET_LOAD_EXT_JOURNAL; 407 goto errout; 408 } 409 /* Make sure the journal UUID is correct */ 410 if (memcmp(jsuper.s_uuid, ctx->fs->super->s_journal_uuid, 411 sizeof(jsuper.s_uuid))) { 412 fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx); 413 retval = EXT2_ET_LOAD_EXT_JOURNAL; 414 goto errout; 415 } 416 417 journal->j_maxlen = ext2fs_blocks_count(&jsuper); 418 start++; 419 } 420 421 if (!(bh = getblk(dev_journal, start, journal->j_blocksize))) { 422 retval = EXT2_ET_NO_MEMORY; 423 goto errout; 424 } 425 426 journal->j_sb_buffer = bh; 427 journal->j_superblock = (journal_superblock_t *)bh->b_data; 428 429#ifdef USE_INODE_IO 430 if (j_inode) 431 ext2fs_free_mem(&j_inode); 432#endif 433 434 *ret_journal = journal; 435 e2fsck_use_inode_shortcuts(ctx, 0); 436 return 0; 437 438errout: 439 e2fsck_use_inode_shortcuts(ctx, 0); 440 if (dev_fs) 441 ext2fs_free_mem(&dev_fs); 442 if (j_inode) 443 ext2fs_free_mem(&j_inode); 444 if (journal) 445 ext2fs_free_mem(&journal); 446 return retval; 447} 448 449static errcode_t e2fsck_journal_fix_bad_inode(e2fsck_t ctx, 450 struct problem_context *pctx) 451{ 452 struct ext2_super_block *sb = ctx->fs->super; 453 int recover = ctx->fs->super->s_feature_incompat & 454 EXT3_FEATURE_INCOMPAT_RECOVER; 455 int has_journal = ctx->fs->super->s_feature_compat & 456 EXT3_FEATURE_COMPAT_HAS_JOURNAL; 457 458 if (has_journal || sb->s_journal_inum) { 459 /* The journal inode is bogus, remove and force full fsck */ 460 pctx->ino = sb->s_journal_inum; 461 if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) { 462 if (has_journal && sb->s_journal_inum) 463 printf("*** ext3 journal has been deleted - " 464 "filesystem is now ext2 only ***\n\n"); 465 sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL; 466 sb->s_journal_inum = 0; 467 ctx->flags |= E2F_FLAG_JOURNAL_INODE; 468 ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 469 e2fsck_clear_recover(ctx, 1); 470 return 0; 471 } 472 return EXT2_ET_BAD_INODE_NUM; 473 } else if (recover) { 474 if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) { 475 e2fsck_clear_recover(ctx, 1); 476 return 0; 477 } 478 return EXT2_ET_UNSUPP_FEATURE; 479 } 480 return 0; 481} 482 483#define V1_SB_SIZE 0x0024 484static void clear_v2_journal_fields(journal_t *journal) 485{ 486 e2fsck_t ctx = journal->j_dev->k_ctx; 487 struct problem_context pctx; 488 489 clear_problem_context(&pctx); 490 491 if (!fix_problem(ctx, PR_0_CLEAR_V2_JOURNAL, &pctx)) 492 return; 493 494 memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0, 495 ctx->fs->blocksize-V1_SB_SIZE); 496 mark_buffer_dirty(journal->j_sb_buffer); 497} 498 499 500static errcode_t e2fsck_journal_load(journal_t *journal) 501{ 502 e2fsck_t ctx = journal->j_dev->k_ctx; 503 journal_superblock_t *jsb; 504 struct buffer_head *jbh = journal->j_sb_buffer; 505 struct problem_context pctx; 506 507 clear_problem_context(&pctx); 508 509 ll_rw_block(READ, 1, &jbh); 510 if (jbh->b_err) { 511 com_err(ctx->device_name, jbh->b_err, 512 _("reading journal superblock\n")); 513 return jbh->b_err; 514 } 515 516 jsb = journal->j_superblock; 517 /* If we don't even have JFS_MAGIC, we probably have a wrong inode */ 518 if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER)) 519 return e2fsck_journal_fix_bad_inode(ctx, &pctx); 520 521 switch (ntohl(jsb->s_header.h_blocktype)) { 522 case JFS_SUPERBLOCK_V1: 523 journal->j_format_version = 1; 524 if (jsb->s_feature_compat || 525 jsb->s_feature_incompat || 526 jsb->s_feature_ro_compat || 527 jsb->s_nr_users) 528 clear_v2_journal_fields(journal); 529 break; 530 531 case JFS_SUPERBLOCK_V2: 532 journal->j_format_version = 2; 533 if (ntohl(jsb->s_nr_users) > 1 && 534 uuid_is_null(ctx->fs->super->s_journal_uuid)) 535 clear_v2_journal_fields(journal); 536 if (ntohl(jsb->s_nr_users) > 1) { 537 fix_problem(ctx, PR_0_JOURNAL_UNSUPP_MULTIFS, &pctx); 538 return EXT2_ET_JOURNAL_UNSUPP_VERSION; 539 } 540 break; 541 542 /* 543 * These should never appear in a journal super block, so if 544 * they do, the journal is badly corrupted. 545 */ 546 case JFS_DESCRIPTOR_BLOCK: 547 case JFS_COMMIT_BLOCK: 548 case JFS_REVOKE_BLOCK: 549 return EXT2_ET_CORRUPT_SUPERBLOCK; 550 551 /* If we don't understand the superblock major type, but there 552 * is a magic number, then it is likely to be a new format we 553 * just don't understand, so leave it alone. */ 554 default: 555 return EXT2_ET_JOURNAL_UNSUPP_VERSION; 556 } 557 558 if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES)) 559 return EXT2_ET_UNSUPP_FEATURE; 560 561 if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES)) 562 return EXT2_ET_RO_UNSUPP_FEATURE; 563 564 /* We have now checked whether we know enough about the journal 565 * format to be able to proceed safely, so any other checks that 566 * fail we should attempt to recover from. */ 567 if (jsb->s_blocksize != htonl(journal->j_blocksize)) { 568 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK, 569 _("%s: no valid journal superblock found\n"), 570 ctx->device_name); 571 return EXT2_ET_CORRUPT_SUPERBLOCK; 572 } 573 574 if (ntohl(jsb->s_maxlen) < journal->j_maxlen) 575 journal->j_maxlen = ntohl(jsb->s_maxlen); 576 else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) { 577 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK, 578 _("%s: journal too short\n"), 579 ctx->device_name); 580 return EXT2_ET_CORRUPT_SUPERBLOCK; 581 } 582 583 journal->j_tail_sequence = ntohl(jsb->s_sequence); 584 journal->j_transaction_sequence = journal->j_tail_sequence; 585 journal->j_tail = ntohl(jsb->s_start); 586 journal->j_first = ntohl(jsb->s_first); 587 journal->j_last = ntohl(jsb->s_maxlen); 588 589 return 0; 590} 591 592static void e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb, 593 journal_t *journal) 594{ 595 char *p; 596 union { 597 uuid_t uuid; 598 __u32 val[4]; 599 } u; 600 __u32 new_seq = 0; 601 int i; 602 603 /* Leave a valid existing V1 superblock signature alone. 604 * Anything unrecognisable we overwrite with a new V2 605 * signature. */ 606 607 if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER) || 608 jsb->s_header.h_blocktype != htonl(JFS_SUPERBLOCK_V1)) { 609 jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER); 610 jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2); 611 } 612 613 /* Zero out everything else beyond the superblock header */ 614 615 p = ((char *) jsb) + sizeof(journal_header_t); 616 memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t)); 617 618 jsb->s_blocksize = htonl(ctx->fs->blocksize); 619 jsb->s_maxlen = htonl(journal->j_maxlen); 620 jsb->s_first = htonl(1); 621 622 /* Initialize the journal sequence number so that there is "no" 623 * chance we will find old "valid" transactions in the journal. 624 * This avoids the need to zero the whole journal (slow to do, 625 * and risky when we are just recovering the filesystem). 626 */ 627 uuid_generate(u.uuid); 628 for (i = 0; i < 4; i ++) 629 new_seq ^= u.val[i]; 630 jsb->s_sequence = htonl(new_seq); 631 632 mark_buffer_dirty(journal->j_sb_buffer); 633 ll_rw_block(WRITE, 1, &journal->j_sb_buffer); 634} 635 636static errcode_t e2fsck_journal_fix_corrupt_super(e2fsck_t ctx, 637 journal_t *journal, 638 struct problem_context *pctx) 639{ 640 struct ext2_super_block *sb = ctx->fs->super; 641 int recover = ctx->fs->super->s_feature_incompat & 642 EXT3_FEATURE_INCOMPAT_RECOVER; 643 644 if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) { 645 if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) { 646 e2fsck_journal_reset_super(ctx, journal->j_superblock, 647 journal); 648 journal->j_transaction_sequence = 1; 649 e2fsck_clear_recover(ctx, recover); 650 return 0; 651 } 652 return EXT2_ET_CORRUPT_SUPERBLOCK; 653 } else if (e2fsck_journal_fix_bad_inode(ctx, pctx)) 654 return EXT2_ET_CORRUPT_SUPERBLOCK; 655 656 return 0; 657} 658 659static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal, 660 int reset, int drop) 661{ 662 journal_superblock_t *jsb; 663 664 if (drop) 665 mark_buffer_clean(journal->j_sb_buffer); 666 else if (!(ctx->options & E2F_OPT_READONLY)) { 667 jsb = journal->j_superblock; 668 jsb->s_sequence = htonl(journal->j_transaction_sequence); 669 if (reset) 670 jsb->s_start = 0; /* this marks the journal as empty */ 671 mark_buffer_dirty(journal->j_sb_buffer); 672 } 673 brelse(journal->j_sb_buffer); 674 675 if (ctx->journal_io) { 676 if (ctx->fs && ctx->fs->io != ctx->journal_io) 677 io_channel_close(ctx->journal_io); 678 ctx->journal_io = 0; 679 } 680 681#ifndef USE_INODE_IO 682 if (journal->j_inode) 683 ext2fs_free_mem(&journal->j_inode); 684#endif 685 if (journal->j_fs_dev) 686 ext2fs_free_mem(&journal->j_fs_dev); 687 ext2fs_free_mem(&journal); 688} 689 690/* 691 * This function makes sure that the superblock fields regarding the 692 * journal are consistent. 693 */ 694int e2fsck_check_ext3_journal(e2fsck_t ctx) 695{ 696 struct ext2_super_block *sb = ctx->fs->super; 697 journal_t *journal; 698 int recover = ctx->fs->super->s_feature_incompat & 699 EXT3_FEATURE_INCOMPAT_RECOVER; 700 struct problem_context pctx; 701 problem_t problem; 702 int reset = 0, force_fsck = 0; 703 int retval; 704 705 /* If we don't have any journal features, don't do anything more */ 706 if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) && 707 !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 && 708 uuid_is_null(sb->s_journal_uuid)) 709 return 0; 710 711 clear_problem_context(&pctx); 712 pctx.num = sb->s_journal_inum; 713 714 retval = e2fsck_get_journal(ctx, &journal); 715 if (retval) { 716 if ((retval == EXT2_ET_BAD_INODE_NUM) || 717 (retval == EXT2_ET_BAD_BLOCK_NUM) || 718 (retval == EXT2_ET_JOURNAL_TOO_SMALL) || 719 (retval == EXT2_ET_NO_JOURNAL)) 720 return e2fsck_journal_fix_bad_inode(ctx, &pctx); 721 return retval; 722 } 723 724 retval = e2fsck_journal_load(journal); 725 if (retval) { 726 if ((retval == EXT2_ET_CORRUPT_SUPERBLOCK) || 727 ((retval == EXT2_ET_UNSUPP_FEATURE) && 728 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_INCOMPAT, 729 &pctx))) || 730 ((retval == EXT2_ET_RO_UNSUPP_FEATURE) && 731 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_ROCOMPAT, 732 &pctx))) || 733 ((retval == EXT2_ET_JOURNAL_UNSUPP_VERSION) && 734 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_VERSION, &pctx)))) 735 retval = e2fsck_journal_fix_corrupt_super(ctx, journal, 736 &pctx); 737 e2fsck_journal_release(ctx, journal, 0, 1); 738 return retval; 739 } 740 741 /* 742 * We want to make the flags consistent here. We will not leave with 743 * needs_recovery set but has_journal clear. We can't get in a loop 744 * with -y, -n, or -p, only if a user isn't making up their mind. 745 */ 746no_has_journal: 747 if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) { 748 recover = sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER; 749 pctx.str = "inode"; 750 if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) { 751 if (recover && 752 !fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx)) 753 goto no_has_journal; 754 /* 755 * Need a full fsck if we are releasing a 756 * journal stored on a reserved inode. 757 */ 758 force_fsck = recover || 759 (sb->s_journal_inum < EXT2_FIRST_INODE(sb)); 760 /* Clear all of the journal fields */ 761 sb->s_journal_inum = 0; 762 sb->s_journal_dev = 0; 763 memset(sb->s_journal_uuid, 0, 764 sizeof(sb->s_journal_uuid)); 765 e2fsck_clear_recover(ctx, force_fsck); 766 } else if (!(ctx->options & E2F_OPT_READONLY)) { 767 sb->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL; 768 ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 769 ext2fs_mark_super_dirty(ctx->fs); 770 } 771 } 772 773 if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL && 774 !(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) && 775 journal->j_superblock->s_start != 0) { 776 /* Print status information */ 777 fix_problem(ctx, PR_0_JOURNAL_RECOVERY_CLEAR, &pctx); 778 if (ctx->superblock) 779 problem = PR_0_JOURNAL_RUN_DEFAULT; 780 else 781 problem = PR_0_JOURNAL_RUN; 782 if (fix_problem(ctx, problem, &pctx)) { 783 ctx->options |= E2F_OPT_FORCE; 784 sb->s_feature_incompat |= 785 EXT3_FEATURE_INCOMPAT_RECOVER; 786 ext2fs_mark_super_dirty(ctx->fs); 787 } else if (fix_problem(ctx, 788 PR_0_JOURNAL_RESET_JOURNAL, &pctx)) { 789 reset = 1; 790 sb->s_state &= ~EXT2_VALID_FS; 791 ext2fs_mark_super_dirty(ctx->fs); 792 } 793 /* 794 * If the user answers no to the above question, we 795 * ignore the fact that journal apparently has data; 796 * accidentally replaying over valid data would be far 797 * worse than skipping a questionable recovery. 798 * 799 * XXX should we abort with a fatal error here? What 800 * will the ext3 kernel code do if a filesystem with 801 * !NEEDS_RECOVERY but with a non-zero 802 * journal->j_superblock->s_start is mounted? 803 */ 804 } 805 806 /* 807 * If we don't need to do replay the journal, check to see if 808 * the journal's errno is set; if so, we need to mark the file 809 * system as being corrupt and clear the journal's s_errno. 810 */ 811 if (!(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) && 812 journal->j_superblock->s_errno) { 813 ctx->fs->super->s_state |= EXT2_ERROR_FS; 814 ext2fs_mark_super_dirty(ctx->fs); 815 journal->j_superblock->s_errno = 0; 816 mark_buffer_dirty(journal->j_sb_buffer); 817 } 818 819 e2fsck_journal_release(ctx, journal, reset, 0); 820 return retval; 821} 822 823static errcode_t recover_ext3_journal(e2fsck_t ctx) 824{ 825 struct problem_context pctx; 826 journal_t *journal; 827 int retval; 828 829 clear_problem_context(&pctx); 830 831 journal_init_revoke_caches(); 832 retval = e2fsck_get_journal(ctx, &journal); 833 if (retval) 834 return retval; 835 836 retval = e2fsck_journal_load(journal); 837 if (retval) 838 goto errout; 839 840 retval = journal_init_revoke(journal, 1024); 841 if (retval) 842 goto errout; 843 844 retval = -journal_recover(journal); 845 if (retval) 846 goto errout; 847 848 if (journal->j_failed_commit) { 849 pctx.ino = journal->j_failed_commit; 850 fix_problem(ctx, PR_0_JNL_TXN_CORRUPT, &pctx); 851 journal->j_superblock->s_errno = -EINVAL; 852 mark_buffer_dirty(journal->j_sb_buffer); 853 } 854 855errout: 856 journal_destroy_revoke(journal); 857 journal_destroy_revoke_caches(); 858 e2fsck_journal_release(ctx, journal, 1, 0); 859 return retval; 860} 861 862int e2fsck_run_ext3_journal(e2fsck_t ctx) 863{ 864 io_manager io_ptr = ctx->fs->io->manager; 865 int blocksize = ctx->fs->blocksize; 866 errcode_t retval, recover_retval; 867 io_stats stats = 0; 868 unsigned long long kbytes_written = 0; 869 870 printf(_("%s: recovering journal\n"), ctx->device_name); 871 if (ctx->options & E2F_OPT_READONLY) { 872 printf(_("%s: won't do journal recovery while read-only\n"), 873 ctx->device_name); 874 return EXT2_ET_FILE_RO; 875 } 876 877 if (ctx->fs->flags & EXT2_FLAG_DIRTY) 878 ext2fs_flush(ctx->fs); /* Force out any modifications */ 879 880 recover_retval = recover_ext3_journal(ctx); 881 882 /* 883 * Reload the filesystem context to get up-to-date data from disk 884 * because journal recovery will change the filesystem under us. 885 */ 886 if (ctx->fs->super->s_kbytes_written && 887 ctx->fs->io->manager->get_stats) 888 ctx->fs->io->manager->get_stats(ctx->fs->io, &stats); 889 if (stats && stats->bytes_written) 890 kbytes_written = stats->bytes_written >> 10; 891 892 ext2fs_mmp_stop(ctx->fs); 893 ext2fs_free(ctx->fs); 894 retval = ext2fs_open(ctx->filesystem_name, EXT2_FLAG_RW, 895 ctx->superblock, blocksize, io_ptr, 896 &ctx->fs); 897 if (retval) { 898 com_err(ctx->program_name, retval, 899 _("while trying to re-open %s"), 900 ctx->device_name); 901 fatal_error(ctx, 0); 902 } 903 ctx->fs->priv_data = ctx; 904 ctx->fs->now = ctx->now; 905 ctx->fs->flags |= EXT2_FLAG_MASTER_SB_ONLY; 906 ctx->fs->super->s_kbytes_written += kbytes_written; 907 908 /* Set the superblock flags */ 909 e2fsck_clear_recover(ctx, recover_retval); 910 911 /* 912 * Do one last sanity check, and propagate journal->s_errno to 913 * the EXT2_ERROR_FS flag in the fs superblock if needed. 914 */ 915 retval = e2fsck_check_ext3_journal(ctx); 916 return retval ? retval : recover_retval; 917} 918 919/* 920 * This function will move the journal inode from a visible file in 921 * the filesystem directory hierarchy to the reserved inode if necessary. 922 */ 923static const char * const journal_names[] = { 924 ".journal", "journal", ".journal.dat", "journal.dat", 0 }; 925 926void e2fsck_move_ext3_journal(e2fsck_t ctx) 927{ 928 struct ext2_super_block *sb = ctx->fs->super; 929 struct problem_context pctx; 930 struct ext2_inode inode; 931 ext2_filsys fs = ctx->fs; 932 ext2_ino_t ino; 933 errcode_t retval; 934 const char * const * cpp; 935 int group, mount_flags; 936 937 clear_problem_context(&pctx); 938 939 /* 940 * If the filesystem is opened read-only, or there is no 941 * journal, then do nothing. 942 */ 943 if ((ctx->options & E2F_OPT_READONLY) || 944 (sb->s_journal_inum == 0) || 945 !(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 946 return; 947 948 /* 949 * Read in the journal inode 950 */ 951 if (ext2fs_read_inode(fs, sb->s_journal_inum, &inode) != 0) 952 return; 953 954 /* 955 * If it's necessary to backup the journal inode, do so. 956 */ 957 if ((sb->s_jnl_backup_type == 0) || 958 ((sb->s_jnl_backup_type == EXT3_JNL_BACKUP_BLOCKS) && 959 memcmp(inode.i_block, sb->s_jnl_blocks, EXT2_N_BLOCKS*4))) { 960 if (fix_problem(ctx, PR_0_BACKUP_JNL, &pctx)) { 961 memcpy(sb->s_jnl_blocks, inode.i_block, 962 EXT2_N_BLOCKS*4); 963 sb->s_jnl_blocks[15] = inode.i_size_high; 964 sb->s_jnl_blocks[16] = inode.i_size; 965 sb->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS; 966 ext2fs_mark_super_dirty(fs); 967 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 968 } 969 } 970 971 /* 972 * If the journal is already the hidden inode, then do nothing 973 */ 974 if (sb->s_journal_inum == EXT2_JOURNAL_INO) 975 return; 976 977 /* 978 * The journal inode had better have only one link and not be readable. 979 */ 980 if (inode.i_links_count != 1) 981 return; 982 983 /* 984 * If the filesystem is mounted, or we can't tell whether 985 * or not it's mounted, do nothing. 986 */ 987 retval = ext2fs_check_if_mounted(ctx->filesystem_name, &mount_flags); 988 if (retval || (mount_flags & EXT2_MF_MOUNTED)) 989 return; 990 991 /* 992 * If we can't find the name of the journal inode, then do 993 * nothing. 994 */ 995 for (cpp = journal_names; *cpp; cpp++) { 996 retval = ext2fs_lookup(fs, EXT2_ROOT_INO, *cpp, 997 strlen(*cpp), 0, &ino); 998 if ((retval == 0) && (ino == sb->s_journal_inum)) 999 break; 1000 } 1001 if (*cpp == 0) 1002 return; 1003 1004 /* We need the inode bitmap to be loaded */ 1005 retval = ext2fs_read_bitmaps(fs); 1006 if (retval) 1007 return; 1008 1009 pctx.str = *cpp; 1010 if (!fix_problem(ctx, PR_0_MOVE_JOURNAL, &pctx)) 1011 return; 1012 1013 /* 1014 * OK, we've done all the checks, let's actually move the 1015 * journal inode. Errors at this point mean we need to force 1016 * an ext2 filesystem check. 1017 */ 1018 if ((retval = ext2fs_unlink(fs, EXT2_ROOT_INO, *cpp, ino, 0)) != 0) 1019 goto err_out; 1020 if ((retval = ext2fs_write_inode(fs, EXT2_JOURNAL_INO, &inode)) != 0) 1021 goto err_out; 1022 sb->s_journal_inum = EXT2_JOURNAL_INO; 1023 ext2fs_mark_super_dirty(fs); 1024 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 1025 inode.i_links_count = 0; 1026 inode.i_dtime = ctx->now; 1027 if ((retval = ext2fs_write_inode(fs, ino, &inode)) != 0) 1028 goto err_out; 1029 1030 group = ext2fs_group_of_ino(fs, ino); 1031 ext2fs_unmark_inode_bitmap2(fs->inode_map, ino); 1032 ext2fs_mark_ib_dirty(fs); 1033 ext2fs_bg_free_inodes_count_set(fs, group, ext2fs_bg_free_inodes_count(fs, group) + 1); 1034 ext2fs_group_desc_csum_set(fs, group); 1035 fs->super->s_free_inodes_count++; 1036 return; 1037 1038err_out: 1039 pctx.errcode = retval; 1040 fix_problem(ctx, PR_0_ERR_MOVE_JOURNAL, &pctx); 1041 fs->super->s_state &= ~EXT2_VALID_FS; 1042 ext2fs_mark_super_dirty(fs); 1043 return; 1044} 1045 1046/* 1047 * This function makes sure the superblock hint for the external 1048 * journal is correct. 1049 */ 1050int e2fsck_fix_ext3_journal_hint(e2fsck_t ctx) 1051{ 1052 struct ext2_super_block *sb = ctx->fs->super; 1053 struct problem_context pctx; 1054 char uuid[37], *journal_name; 1055 struct stat st; 1056 1057 if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) || 1058 uuid_is_null(sb->s_journal_uuid)) 1059 return 0; 1060 1061 uuid_unparse(sb->s_journal_uuid, uuid); 1062 journal_name = blkid_get_devname(ctx->blkid, "UUID", uuid); 1063 if (!journal_name) 1064 return 0; 1065 1066 if (stat(journal_name, &st) < 0) 1067 return 0; 1068 1069 if (st.st_rdev != sb->s_journal_dev) { 1070 clear_problem_context(&pctx); 1071 pctx.num = st.st_rdev; 1072 if (fix_problem(ctx, PR_0_EXTERNAL_JOURNAL_HINT, &pctx)) { 1073 sb->s_journal_dev = st.st_rdev; 1074 ext2fs_mark_super_dirty(ctx->fs); 1075 } 1076 } 1077 1078 free(journal_name); 1079 return 0; 1080} 1081