journal.c revision 974d57d3b1f896d2064ba854d7c037ab6478ecf8
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 (int) 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 errcode_t 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 = (int) 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 = (int) 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 blk64_t maxlen; 245 246 clear_problem_context(&pctx); 247 248 journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal"); 249 if (!journal) { 250 return EXT2_ET_NO_MEMORY; 251 } 252 253 dev_fs = e2fsck_allocate_memory(ctx, 2*sizeof(struct kdev_s), "kdev"); 254 if (!dev_fs) { 255 retval = EXT2_ET_NO_MEMORY; 256 goto errout; 257 } 258 dev_journal = dev_fs+1; 259 260 dev_fs->k_ctx = dev_journal->k_ctx = ctx; 261 dev_fs->k_dev = K_DEV_FS; 262 dev_journal->k_dev = K_DEV_JOURNAL; 263 264 journal->j_dev = dev_journal; 265 journal->j_fs_dev = dev_fs; 266 journal->j_inode = NULL; 267 journal->j_blocksize = ctx->fs->blocksize; 268 269 if (uuid_is_null(sb->s_journal_uuid)) { 270 if (!sb->s_journal_inum) { 271 retval = EXT2_ET_BAD_INODE_NUM; 272 goto errout; 273 } 274 j_inode = e2fsck_allocate_memory(ctx, sizeof(*j_inode), 275 "journal inode"); 276 if (!j_inode) { 277 retval = EXT2_ET_NO_MEMORY; 278 goto errout; 279 } 280 281 j_inode->i_ctx = ctx; 282 j_inode->i_ino = sb->s_journal_inum; 283 284 if ((retval = ext2fs_read_inode(ctx->fs, 285 sb->s_journal_inum, 286 &j_inode->i_ext2))) { 287 try_backup_journal: 288 if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS || 289 tried_backup_jnl) 290 goto errout; 291 memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode)); 292 memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks, 293 EXT2_N_BLOCKS*4); 294 j_inode->i_ext2.i_size_high = sb->s_jnl_blocks[15]; 295 j_inode->i_ext2.i_size = sb->s_jnl_blocks[16]; 296 j_inode->i_ext2.i_links_count = 1; 297 j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600; 298 e2fsck_use_inode_shortcuts(ctx, 1); 299 ctx->stashed_ino = j_inode->i_ino; 300 ctx->stashed_inode = &j_inode->i_ext2; 301 tried_backup_jnl++; 302 } 303 if (!j_inode->i_ext2.i_links_count || 304 !LINUX_S_ISREG(j_inode->i_ext2.i_mode)) { 305 retval = EXT2_ET_NO_JOURNAL; 306 goto try_backup_journal; 307 } 308 if (EXT2_I_SIZE(&j_inode->i_ext2) / journal->j_blocksize < 309 JFS_MIN_JOURNAL_BLOCKS) { 310 retval = EXT2_ET_JOURNAL_TOO_SMALL; 311 goto try_backup_journal; 312 } 313 pb.last_block = -1; 314 retval = ext2fs_block_iterate3(ctx->fs, j_inode->i_ino, 315 BLOCK_FLAG_HOLE, 0, 316 process_journal_block, &pb); 317 if ((pb.last_block + 1) * ctx->fs->blocksize < 318 (int) EXT2_I_SIZE(&j_inode->i_ext2)) { 319 retval = EXT2_ET_JOURNAL_TOO_SMALL; 320 goto try_backup_journal; 321 } 322 if (tried_backup_jnl && !(ctx->options & E2F_OPT_READONLY)) { 323 retval = ext2fs_write_inode(ctx->fs, sb->s_journal_inum, 324 &j_inode->i_ext2); 325 if (retval) 326 goto errout; 327 } 328 329 journal->j_maxlen = EXT2_I_SIZE(&j_inode->i_ext2) / 330 journal->j_blocksize; 331 332#ifdef USE_INODE_IO 333 retval = ext2fs_inode_io_intern2(ctx->fs, sb->s_journal_inum, 334 &j_inode->i_ext2, 335 &journal_name); 336 if (retval) 337 goto errout; 338 339 io_ptr = inode_io_manager; 340#else 341 journal->j_inode = j_inode; 342 ctx->journal_io = ctx->fs->io; 343 if ((retval = (errcode_t) journal_bmap(journal, 0, &start)) != 0) 344 goto errout; 345#endif 346 } else { 347 ext_journal = 1; 348 if (!ctx->journal_name) { 349 char uuid[37]; 350 351 uuid_unparse(sb->s_journal_uuid, uuid); 352 ctx->journal_name = blkid_get_devname(ctx->blkid, 353 "UUID", uuid); 354 if (!ctx->journal_name) 355 ctx->journal_name = blkid_devno_to_devname(sb->s_journal_dev); 356 } 357 journal_name = ctx->journal_name; 358 359 if (!journal_name) { 360 fix_problem(ctx, PR_0_CANT_FIND_JOURNAL, &pctx); 361 retval = EXT2_ET_LOAD_EXT_JOURNAL; 362 goto errout; 363 } 364 365 jfs_debug(1, "Using journal file %s\n", journal_name); 366 io_ptr = unix_io_manager; 367 } 368 369#if 0 370 test_io_backing_manager = io_ptr; 371 io_ptr = test_io_manager; 372#endif 373#ifndef USE_INODE_IO 374 if (ext_journal) 375#endif 376 { 377 int flags = IO_FLAG_RW; 378 if (!(ctx->mount_flags & EXT2_MF_ISROOT && 379 ctx->mount_flags & EXT2_MF_READONLY)) 380 flags |= IO_FLAG_EXCLUSIVE; 381 if ((ctx->mount_flags & EXT2_MF_READONLY) && 382 (ctx->options & E2F_OPT_FORCE)) 383 flags &= ~IO_FLAG_EXCLUSIVE; 384 385 386 retval = io_ptr->open(journal_name, flags, 387 &ctx->journal_io); 388 } 389 if (retval) 390 goto errout; 391 392 io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize); 393 394 if (ext_journal) { 395 if (ctx->fs->blocksize == 1024) 396 start = 1; 397 bh = getblk(dev_journal, start, ctx->fs->blocksize); 398 if (!bh) { 399 retval = EXT2_ET_NO_MEMORY; 400 goto errout; 401 } 402 ll_rw_block(READ, 1, &bh); 403 if ((retval = bh->b_err) != 0) { 404 brelse(bh); 405 goto errout; 406 } 407 memcpy(&jsuper, start ? bh->b_data : bh->b_data + 1024, 408 sizeof(jsuper)); 409 brelse(bh); 410#ifdef WORDS_BIGENDIAN 411 if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) 412 ext2fs_swap_super(&jsuper); 413#endif 414 if (jsuper.s_magic != EXT2_SUPER_MAGIC || 415 !(jsuper.s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { 416 fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx); 417 retval = EXT2_ET_LOAD_EXT_JOURNAL; 418 goto errout; 419 } 420 /* Make sure the journal UUID is correct */ 421 if (memcmp(jsuper.s_uuid, ctx->fs->super->s_journal_uuid, 422 sizeof(jsuper.s_uuid))) { 423 fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx); 424 retval = EXT2_ET_LOAD_EXT_JOURNAL; 425 goto errout; 426 } 427 428 maxlen = ext2fs_blocks_count(&jsuper); 429 if (maxlen > 1ULL << 32) 430 maxlen = (1ULL << 32) - 1; 431 journal->j_maxlen = maxlen; 432 start++; 433 } 434 435 if (!(bh = getblk(dev_journal, start, journal->j_blocksize))) { 436 retval = EXT2_ET_NO_MEMORY; 437 goto errout; 438 } 439 440 journal->j_sb_buffer = bh; 441 journal->j_superblock = (journal_superblock_t *)bh->b_data; 442 443#ifdef USE_INODE_IO 444 if (j_inode) 445 ext2fs_free_mem(&j_inode); 446#endif 447 448 *ret_journal = journal; 449 e2fsck_use_inode_shortcuts(ctx, 0); 450 return 0; 451 452errout: 453 e2fsck_use_inode_shortcuts(ctx, 0); 454 if (dev_fs) 455 ext2fs_free_mem(&dev_fs); 456 if (j_inode) 457 ext2fs_free_mem(&j_inode); 458 if (journal) 459 ext2fs_free_mem(&journal); 460 return retval; 461} 462 463static errcode_t e2fsck_journal_fix_bad_inode(e2fsck_t ctx, 464 struct problem_context *pctx) 465{ 466 struct ext2_super_block *sb = ctx->fs->super; 467 int recover = ctx->fs->super->s_feature_incompat & 468 EXT3_FEATURE_INCOMPAT_RECOVER; 469 int has_journal = ctx->fs->super->s_feature_compat & 470 EXT3_FEATURE_COMPAT_HAS_JOURNAL; 471 472 if (has_journal || sb->s_journal_inum) { 473 /* The journal inode is bogus, remove and force full fsck */ 474 pctx->ino = sb->s_journal_inum; 475 if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) { 476 if (has_journal && sb->s_journal_inum) 477 printf("*** ext3 journal has been deleted - " 478 "filesystem is now ext2 only ***\n\n"); 479 sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL; 480 sb->s_journal_inum = 0; 481 ctx->flags |= E2F_FLAG_JOURNAL_INODE; 482 ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 483 e2fsck_clear_recover(ctx, 1); 484 return 0; 485 } 486 return EXT2_ET_BAD_INODE_NUM; 487 } else if (recover) { 488 if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) { 489 e2fsck_clear_recover(ctx, 1); 490 return 0; 491 } 492 return EXT2_ET_UNSUPP_FEATURE; 493 } 494 return 0; 495} 496 497#define V1_SB_SIZE 0x0024 498static void clear_v2_journal_fields(journal_t *journal) 499{ 500 e2fsck_t ctx = journal->j_dev->k_ctx; 501 struct problem_context pctx; 502 503 clear_problem_context(&pctx); 504 505 if (!fix_problem(ctx, PR_0_CLEAR_V2_JOURNAL, &pctx)) 506 return; 507 508 memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0, 509 ctx->fs->blocksize-V1_SB_SIZE); 510 mark_buffer_dirty(journal->j_sb_buffer); 511} 512 513 514static errcode_t e2fsck_journal_load(journal_t *journal) 515{ 516 e2fsck_t ctx = journal->j_dev->k_ctx; 517 journal_superblock_t *jsb; 518 struct buffer_head *jbh = journal->j_sb_buffer; 519 struct problem_context pctx; 520 521 clear_problem_context(&pctx); 522 523 ll_rw_block(READ, 1, &jbh); 524 if (jbh->b_err) { 525 com_err(ctx->device_name, jbh->b_err, 526 _("reading journal superblock\n")); 527 return jbh->b_err; 528 } 529 530 jsb = journal->j_superblock; 531 /* If we don't even have JFS_MAGIC, we probably have a wrong inode */ 532 if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER)) 533 return e2fsck_journal_fix_bad_inode(ctx, &pctx); 534 535 switch (ntohl(jsb->s_header.h_blocktype)) { 536 case JFS_SUPERBLOCK_V1: 537 journal->j_format_version = 1; 538 if (jsb->s_feature_compat || 539 jsb->s_feature_incompat || 540 jsb->s_feature_ro_compat || 541 jsb->s_nr_users) 542 clear_v2_journal_fields(journal); 543 break; 544 545 case JFS_SUPERBLOCK_V2: 546 journal->j_format_version = 2; 547 if (ntohl(jsb->s_nr_users) > 1 && 548 uuid_is_null(ctx->fs->super->s_journal_uuid)) 549 clear_v2_journal_fields(journal); 550 if (ntohl(jsb->s_nr_users) > 1) { 551 fix_problem(ctx, PR_0_JOURNAL_UNSUPP_MULTIFS, &pctx); 552 return EXT2_ET_JOURNAL_UNSUPP_VERSION; 553 } 554 break; 555 556 /* 557 * These should never appear in a journal super block, so if 558 * they do, the journal is badly corrupted. 559 */ 560 case JFS_DESCRIPTOR_BLOCK: 561 case JFS_COMMIT_BLOCK: 562 case JFS_REVOKE_BLOCK: 563 return EXT2_ET_CORRUPT_SUPERBLOCK; 564 565 /* If we don't understand the superblock major type, but there 566 * is a magic number, then it is likely to be a new format we 567 * just don't understand, so leave it alone. */ 568 default: 569 return EXT2_ET_JOURNAL_UNSUPP_VERSION; 570 } 571 572 if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES)) 573 return EXT2_ET_UNSUPP_FEATURE; 574 575 if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES)) 576 return EXT2_ET_RO_UNSUPP_FEATURE; 577 578 /* We have now checked whether we know enough about the journal 579 * format to be able to proceed safely, so any other checks that 580 * fail we should attempt to recover from. */ 581 if (jsb->s_blocksize != htonl(journal->j_blocksize)) { 582 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK, 583 _("%s: no valid journal superblock found\n"), 584 ctx->device_name); 585 return EXT2_ET_CORRUPT_SUPERBLOCK; 586 } 587 588 if (ntohl(jsb->s_maxlen) < journal->j_maxlen) 589 journal->j_maxlen = ntohl(jsb->s_maxlen); 590 else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) { 591 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK, 592 _("%s: journal too short\n"), 593 ctx->device_name); 594 return EXT2_ET_CORRUPT_SUPERBLOCK; 595 } 596 597 journal->j_tail_sequence = ntohl(jsb->s_sequence); 598 journal->j_transaction_sequence = journal->j_tail_sequence; 599 journal->j_tail = ntohl(jsb->s_start); 600 journal->j_first = ntohl(jsb->s_first); 601 journal->j_last = ntohl(jsb->s_maxlen); 602 603 return 0; 604} 605 606static void e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb, 607 journal_t *journal) 608{ 609 char *p; 610 union { 611 uuid_t uuid; 612 __u32 val[4]; 613 } u; 614 __u32 new_seq = 0; 615 int i; 616 617 /* Leave a valid existing V1 superblock signature alone. 618 * Anything unrecognisable we overwrite with a new V2 619 * signature. */ 620 621 if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER) || 622 jsb->s_header.h_blocktype != htonl(JFS_SUPERBLOCK_V1)) { 623 jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER); 624 jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2); 625 } 626 627 /* Zero out everything else beyond the superblock header */ 628 629 p = ((char *) jsb) + sizeof(journal_header_t); 630 memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t)); 631 632 jsb->s_blocksize = htonl(ctx->fs->blocksize); 633 jsb->s_maxlen = htonl(journal->j_maxlen); 634 jsb->s_first = htonl(1); 635 636 /* Initialize the journal sequence number so that there is "no" 637 * chance we will find old "valid" transactions in the journal. 638 * This avoids the need to zero the whole journal (slow to do, 639 * and risky when we are just recovering the filesystem). 640 */ 641 uuid_generate(u.uuid); 642 for (i = 0; i < 4; i ++) 643 new_seq ^= u.val[i]; 644 jsb->s_sequence = htonl(new_seq); 645 646 mark_buffer_dirty(journal->j_sb_buffer); 647 ll_rw_block(WRITE, 1, &journal->j_sb_buffer); 648} 649 650static errcode_t e2fsck_journal_fix_corrupt_super(e2fsck_t ctx, 651 journal_t *journal, 652 struct problem_context *pctx) 653{ 654 struct ext2_super_block *sb = ctx->fs->super; 655 int recover = ctx->fs->super->s_feature_incompat & 656 EXT3_FEATURE_INCOMPAT_RECOVER; 657 658 if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) { 659 if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) { 660 e2fsck_journal_reset_super(ctx, journal->j_superblock, 661 journal); 662 journal->j_transaction_sequence = 1; 663 e2fsck_clear_recover(ctx, recover); 664 return 0; 665 } 666 return EXT2_ET_CORRUPT_SUPERBLOCK; 667 } else if (e2fsck_journal_fix_bad_inode(ctx, pctx)) 668 return EXT2_ET_CORRUPT_SUPERBLOCK; 669 670 return 0; 671} 672 673static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal, 674 int reset, int drop) 675{ 676 journal_superblock_t *jsb; 677 678 if (drop) 679 mark_buffer_clean(journal->j_sb_buffer); 680 else if (!(ctx->options & E2F_OPT_READONLY)) { 681 jsb = journal->j_superblock; 682 jsb->s_sequence = htonl(journal->j_transaction_sequence); 683 if (reset) 684 jsb->s_start = 0; /* this marks the journal as empty */ 685 mark_buffer_dirty(journal->j_sb_buffer); 686 } 687 brelse(journal->j_sb_buffer); 688 689 if (ctx->journal_io) { 690 if (ctx->fs && ctx->fs->io != ctx->journal_io) 691 io_channel_close(ctx->journal_io); 692 ctx->journal_io = 0; 693 } 694 695#ifndef USE_INODE_IO 696 if (journal->j_inode) 697 ext2fs_free_mem(&journal->j_inode); 698#endif 699 if (journal->j_fs_dev) 700 ext2fs_free_mem(&journal->j_fs_dev); 701 ext2fs_free_mem(&journal); 702} 703 704/* 705 * This function makes sure that the superblock fields regarding the 706 * journal are consistent. 707 */ 708errcode_t e2fsck_check_ext3_journal(e2fsck_t ctx) 709{ 710 struct ext2_super_block *sb = ctx->fs->super; 711 journal_t *journal; 712 int recover = ctx->fs->super->s_feature_incompat & 713 EXT3_FEATURE_INCOMPAT_RECOVER; 714 struct problem_context pctx; 715 problem_t problem; 716 int reset = 0, force_fsck = 0; 717 errcode_t retval; 718 719 /* If we don't have any journal features, don't do anything more */ 720 if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) && 721 !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 && 722 uuid_is_null(sb->s_journal_uuid)) 723 return 0; 724 725 clear_problem_context(&pctx); 726 pctx.num = sb->s_journal_inum; 727 728 retval = e2fsck_get_journal(ctx, &journal); 729 if (retval) { 730 if ((retval == EXT2_ET_BAD_INODE_NUM) || 731 (retval == EXT2_ET_BAD_BLOCK_NUM) || 732 (retval == EXT2_ET_JOURNAL_TOO_SMALL) || 733 (retval == EXT2_ET_NO_JOURNAL)) 734 return e2fsck_journal_fix_bad_inode(ctx, &pctx); 735 return retval; 736 } 737 738 retval = e2fsck_journal_load(journal); 739 if (retval) { 740 if ((retval == EXT2_ET_CORRUPT_SUPERBLOCK) || 741 ((retval == EXT2_ET_UNSUPP_FEATURE) && 742 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_INCOMPAT, 743 &pctx))) || 744 ((retval == EXT2_ET_RO_UNSUPP_FEATURE) && 745 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_ROCOMPAT, 746 &pctx))) || 747 ((retval == EXT2_ET_JOURNAL_UNSUPP_VERSION) && 748 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_VERSION, &pctx)))) 749 retval = e2fsck_journal_fix_corrupt_super(ctx, journal, 750 &pctx); 751 e2fsck_journal_release(ctx, journal, 0, 1); 752 return retval; 753 } 754 755 /* 756 * We want to make the flags consistent here. We will not leave with 757 * needs_recovery set but has_journal clear. We can't get in a loop 758 * with -y, -n, or -p, only if a user isn't making up their mind. 759 */ 760no_has_journal: 761 if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) { 762 recover = sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER; 763 pctx.str = "inode"; 764 if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) { 765 if (recover && 766 !fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx)) 767 goto no_has_journal; 768 /* 769 * Need a full fsck if we are releasing a 770 * journal stored on a reserved inode. 771 */ 772 force_fsck = recover || 773 (sb->s_journal_inum < EXT2_FIRST_INODE(sb)); 774 /* Clear all of the journal fields */ 775 sb->s_journal_inum = 0; 776 sb->s_journal_dev = 0; 777 memset(sb->s_journal_uuid, 0, 778 sizeof(sb->s_journal_uuid)); 779 e2fsck_clear_recover(ctx, force_fsck); 780 } else if (!(ctx->options & E2F_OPT_READONLY)) { 781 sb->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL; 782 ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 783 ext2fs_mark_super_dirty(ctx->fs); 784 } 785 } 786 787 if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL && 788 !(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) && 789 journal->j_superblock->s_start != 0) { 790 /* Print status information */ 791 fix_problem(ctx, PR_0_JOURNAL_RECOVERY_CLEAR, &pctx); 792 if (ctx->superblock) 793 problem = PR_0_JOURNAL_RUN_DEFAULT; 794 else 795 problem = PR_0_JOURNAL_RUN; 796 if (fix_problem(ctx, problem, &pctx)) { 797 ctx->options |= E2F_OPT_FORCE; 798 sb->s_feature_incompat |= 799 EXT3_FEATURE_INCOMPAT_RECOVER; 800 ext2fs_mark_super_dirty(ctx->fs); 801 } else if (fix_problem(ctx, 802 PR_0_JOURNAL_RESET_JOURNAL, &pctx)) { 803 reset = 1; 804 sb->s_state &= ~EXT2_VALID_FS; 805 ext2fs_mark_super_dirty(ctx->fs); 806 } 807 /* 808 * If the user answers no to the above question, we 809 * ignore the fact that journal apparently has data; 810 * accidentally replaying over valid data would be far 811 * worse than skipping a questionable recovery. 812 * 813 * XXX should we abort with a fatal error here? What 814 * will the ext3 kernel code do if a filesystem with 815 * !NEEDS_RECOVERY but with a non-zero 816 * journal->j_superblock->s_start is mounted? 817 */ 818 } 819 820 /* 821 * If we don't need to do replay the journal, check to see if 822 * the journal's errno is set; if so, we need to mark the file 823 * system as being corrupt and clear the journal's s_errno. 824 */ 825 if (!(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) && 826 journal->j_superblock->s_errno) { 827 ctx->fs->super->s_state |= EXT2_ERROR_FS; 828 ext2fs_mark_super_dirty(ctx->fs); 829 journal->j_superblock->s_errno = 0; 830 mark_buffer_dirty(journal->j_sb_buffer); 831 } 832 833 e2fsck_journal_release(ctx, journal, reset, 0); 834 return retval; 835} 836 837static errcode_t recover_ext3_journal(e2fsck_t ctx) 838{ 839 struct problem_context pctx; 840 journal_t *journal; 841 errcode_t retval; 842 843 clear_problem_context(&pctx); 844 845 journal_init_revoke_caches(); 846 retval = e2fsck_get_journal(ctx, &journal); 847 if (retval) 848 return retval; 849 850 retval = e2fsck_journal_load(journal); 851 if (retval) 852 goto errout; 853 854 retval = journal_init_revoke(journal, 1024); 855 if (retval) 856 goto errout; 857 858 retval = -journal_recover(journal); 859 if (retval) 860 goto errout; 861 862 if (journal->j_failed_commit) { 863 pctx.ino = journal->j_failed_commit; 864 fix_problem(ctx, PR_0_JNL_TXN_CORRUPT, &pctx); 865 journal->j_superblock->s_errno = -EINVAL; 866 mark_buffer_dirty(journal->j_sb_buffer); 867 } 868 869errout: 870 journal_destroy_revoke(journal); 871 journal_destroy_revoke_caches(); 872 e2fsck_journal_release(ctx, journal, 1, 0); 873 return retval; 874} 875 876errcode_t e2fsck_run_ext3_journal(e2fsck_t ctx) 877{ 878 io_manager io_ptr = ctx->fs->io->manager; 879 int blocksize = ctx->fs->blocksize; 880 errcode_t retval, recover_retval; 881 io_stats stats = 0; 882 unsigned long long kbytes_written = 0; 883 884 printf(_("%s: recovering journal\n"), ctx->device_name); 885 if (ctx->options & E2F_OPT_READONLY) { 886 printf(_("%s: won't do journal recovery while read-only\n"), 887 ctx->device_name); 888 return EXT2_ET_FILE_RO; 889 } 890 891 if (ctx->fs->flags & EXT2_FLAG_DIRTY) 892 ext2fs_flush(ctx->fs); /* Force out any modifications */ 893 894 recover_retval = recover_ext3_journal(ctx); 895 896 /* 897 * Reload the filesystem context to get up-to-date data from disk 898 * because journal recovery will change the filesystem under us. 899 */ 900 if (ctx->fs->super->s_kbytes_written && 901 ctx->fs->io->manager->get_stats) 902 ctx->fs->io->manager->get_stats(ctx->fs->io, &stats); 903 if (stats && stats->bytes_written) 904 kbytes_written = stats->bytes_written >> 10; 905 906 ext2fs_mmp_stop(ctx->fs); 907 ext2fs_free(ctx->fs); 908 retval = ext2fs_open(ctx->filesystem_name, EXT2_FLAG_RW, 909 ctx->superblock, blocksize, io_ptr, 910 &ctx->fs); 911 if (retval) { 912 com_err(ctx->program_name, retval, 913 _("while trying to re-open %s"), 914 ctx->device_name); 915 fatal_error(ctx, 0); 916 } 917 ctx->fs->priv_data = ctx; 918 ctx->fs->now = ctx->now; 919 ctx->fs->flags |= EXT2_FLAG_MASTER_SB_ONLY; 920 ctx->fs->super->s_kbytes_written += kbytes_written; 921 922 /* Set the superblock flags */ 923 e2fsck_clear_recover(ctx, recover_retval != 0); 924 925 /* 926 * Do one last sanity check, and propagate journal->s_errno to 927 * the EXT2_ERROR_FS flag in the fs superblock if needed. 928 */ 929 retval = e2fsck_check_ext3_journal(ctx); 930 return retval ? retval : recover_retval; 931} 932 933/* 934 * This function will move the journal inode from a visible file in 935 * the filesystem directory hierarchy to the reserved inode if necessary. 936 */ 937static const char * const journal_names[] = { 938 ".journal", "journal", ".journal.dat", "journal.dat", 0 }; 939 940void e2fsck_move_ext3_journal(e2fsck_t ctx) 941{ 942 struct ext2_super_block *sb = ctx->fs->super; 943 struct problem_context pctx; 944 struct ext2_inode inode; 945 ext2_filsys fs = ctx->fs; 946 ext2_ino_t ino; 947 errcode_t retval; 948 const char * const * cpp; 949 int group, mount_flags; 950 951 clear_problem_context(&pctx); 952 953 /* 954 * If the filesystem is opened read-only, or there is no 955 * journal, then do nothing. 956 */ 957 if ((ctx->options & E2F_OPT_READONLY) || 958 (sb->s_journal_inum == 0) || 959 !(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 960 return; 961 962 /* 963 * Read in the journal inode 964 */ 965 if (ext2fs_read_inode(fs, sb->s_journal_inum, &inode) != 0) 966 return; 967 968 /* 969 * If it's necessary to backup the journal inode, do so. 970 */ 971 if ((sb->s_jnl_backup_type == 0) || 972 ((sb->s_jnl_backup_type == EXT3_JNL_BACKUP_BLOCKS) && 973 memcmp(inode.i_block, sb->s_jnl_blocks, EXT2_N_BLOCKS*4))) { 974 if (fix_problem(ctx, PR_0_BACKUP_JNL, &pctx)) { 975 memcpy(sb->s_jnl_blocks, inode.i_block, 976 EXT2_N_BLOCKS*4); 977 sb->s_jnl_blocks[15] = inode.i_size_high; 978 sb->s_jnl_blocks[16] = inode.i_size; 979 sb->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS; 980 ext2fs_mark_super_dirty(fs); 981 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 982 } 983 } 984 985 /* 986 * If the journal is already the hidden inode, then do nothing 987 */ 988 if (sb->s_journal_inum == EXT2_JOURNAL_INO) 989 return; 990 991 /* 992 * The journal inode had better have only one link and not be readable. 993 */ 994 if (inode.i_links_count != 1) 995 return; 996 997 /* 998 * If the filesystem is mounted, or we can't tell whether 999 * or not it's mounted, do nothing. 1000 */ 1001 retval = ext2fs_check_if_mounted(ctx->filesystem_name, &mount_flags); 1002 if (retval || (mount_flags & EXT2_MF_MOUNTED)) 1003 return; 1004 1005 /* 1006 * If we can't find the name of the journal inode, then do 1007 * nothing. 1008 */ 1009 for (cpp = journal_names; *cpp; cpp++) { 1010 retval = ext2fs_lookup(fs, EXT2_ROOT_INO, *cpp, 1011 strlen(*cpp), 0, &ino); 1012 if ((retval == 0) && (ino == sb->s_journal_inum)) 1013 break; 1014 } 1015 if (*cpp == 0) 1016 return; 1017 1018 /* We need the inode bitmap to be loaded */ 1019 retval = ext2fs_read_bitmaps(fs); 1020 if (retval) 1021 return; 1022 1023 pctx.str = *cpp; 1024 if (!fix_problem(ctx, PR_0_MOVE_JOURNAL, &pctx)) 1025 return; 1026 1027 /* 1028 * OK, we've done all the checks, let's actually move the 1029 * journal inode. Errors at this point mean we need to force 1030 * an ext2 filesystem check. 1031 */ 1032 if ((retval = ext2fs_unlink(fs, EXT2_ROOT_INO, *cpp, ino, 0)) != 0) 1033 goto err_out; 1034 if ((retval = ext2fs_write_inode(fs, EXT2_JOURNAL_INO, &inode)) != 0) 1035 goto err_out; 1036 sb->s_journal_inum = EXT2_JOURNAL_INO; 1037 ext2fs_mark_super_dirty(fs); 1038 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; 1039 inode.i_links_count = 0; 1040 inode.i_dtime = ctx->now; 1041 if ((retval = ext2fs_write_inode(fs, ino, &inode)) != 0) 1042 goto err_out; 1043 1044 group = ext2fs_group_of_ino(fs, ino); 1045 ext2fs_unmark_inode_bitmap2(fs->inode_map, ino); 1046 ext2fs_mark_ib_dirty(fs); 1047 ext2fs_bg_free_inodes_count_set(fs, group, ext2fs_bg_free_inodes_count(fs, group) + 1); 1048 ext2fs_group_desc_csum_set(fs, group); 1049 fs->super->s_free_inodes_count++; 1050 return; 1051 1052err_out: 1053 pctx.errcode = retval; 1054 fix_problem(ctx, PR_0_ERR_MOVE_JOURNAL, &pctx); 1055 fs->super->s_state &= ~EXT2_VALID_FS; 1056 ext2fs_mark_super_dirty(fs); 1057 return; 1058} 1059 1060/* 1061 * This function makes sure the superblock hint for the external 1062 * journal is correct. 1063 */ 1064int e2fsck_fix_ext3_journal_hint(e2fsck_t ctx) 1065{ 1066 struct ext2_super_block *sb = ctx->fs->super; 1067 struct problem_context pctx; 1068 char uuid[37], *journal_name; 1069 struct stat st; 1070 1071 if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) || 1072 uuid_is_null(sb->s_journal_uuid)) 1073 return 0; 1074 1075 uuid_unparse(sb->s_journal_uuid, uuid); 1076 journal_name = blkid_get_devname(ctx->blkid, "UUID", uuid); 1077 if (!journal_name) 1078 return 0; 1079 1080 if (stat(journal_name, &st) < 0) 1081 return 0; 1082 1083 if (st.st_rdev != sb->s_journal_dev) { 1084 clear_problem_context(&pctx); 1085 pctx.num = st.st_rdev; 1086 if (fix_problem(ctx, PR_0_EXTERNAL_JOURNAL_HINT, &pctx)) { 1087 sb->s_journal_dev = st.st_rdev; 1088 ext2fs_mark_super_dirty(ctx->fs); 1089 } 1090 } 1091 1092 free(journal_name); 1093 return 0; 1094} 1095