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 "uuid/uuid.h" 27 #include "journal.h" 28 29 #ifdef CONFIG_JBD_DEBUG /* Enabled by configure --enable-jfs-debug */ 30 static int bh_count = 0; 31 #endif 32 33 #if EXT2_FLAT_INCLUDES 34 #include "blkid.h" 35 #else 36 #include "blkid/blkid.h" 37 #endif 38 39 /* 40 * Define USE_INODE_IO to use the inode_io.c / fileio.c codepaths. 41 * This creates a larger static binary, and a smaller binary using 42 * shared libraries. It's also probably slightly less CPU-efficient, 43 * which is why it's not on by default. But, it's a good way of 44 * testing the functions in inode_io.c and fileio.c. 45 */ 46 #undef USE_INODE_IO 47 48 /* Checksumming functions */ 49 static int ext2fs_journal_verify_csum_type(journal_t *j, 50 journal_superblock_t *jsb) 51 { 52 if (!journal_has_csum_v2or3(j)) 53 return 1; 54 55 return jsb->s_checksum_type == JBD2_CRC32C_CHKSUM; 56 } 57 58 static __u32 ext2fs_journal_sb_csum(journal_superblock_t *jsb) 59 { 60 __u32 crc, old_crc; 61 62 old_crc = jsb->s_checksum; 63 jsb->s_checksum = 0; 64 crc = ext2fs_crc32c_le(~0, (unsigned char *)jsb, 65 sizeof(journal_superblock_t)); 66 jsb->s_checksum = old_crc; 67 68 return crc; 69 } 70 71 static int ext2fs_journal_sb_csum_verify(journal_t *j, 72 journal_superblock_t *jsb) 73 { 74 __u32 provided, calculated; 75 76 if (!journal_has_csum_v2or3(j)) 77 return 1; 78 79 provided = ext2fs_be32_to_cpu(jsb->s_checksum); 80 calculated = ext2fs_journal_sb_csum(jsb); 81 82 return provided == calculated; 83 } 84 85 static errcode_t ext2fs_journal_sb_csum_set(journal_t *j, 86 journal_superblock_t *jsb) 87 { 88 __u32 crc; 89 90 if (!journal_has_csum_v2or3(j)) 91 return 0; 92 93 crc = ext2fs_journal_sb_csum(jsb); 94 jsb->s_checksum = ext2fs_cpu_to_be32(crc); 95 return 0; 96 } 97 98 /* Kernel compatibility functions for handling the journal. These allow us 99 * to use the recovery.c file virtually unchanged from the kernel, so we 100 * don't have to do much to keep kernel and user recovery in sync. 101 */ 102 int journal_bmap(journal_t *journal, blk64_t block, unsigned long long *phys) 103 { 104 #ifdef USE_INODE_IO 105 *phys = block; 106 return 0; 107 #else 108 struct inode *inode = journal->j_inode; 109 errcode_t retval; 110 blk64_t pblk; 111 112 if (!inode) { 113 *phys = block; 114 return 0; 115 } 116 117 retval = ext2fs_bmap2(inode->i_fs, inode->i_ino, 118 &inode->i_ext2, NULL, 0, block, 0, &pblk); 119 *phys = pblk; 120 return (int) retval; 121 #endif 122 } 123 124 struct buffer_head *getblk(kdev_t kdev, blk64_t blocknr, int blocksize) 125 { 126 struct buffer_head *bh; 127 int bufsize = sizeof(*bh) + kdev->k_fs->blocksize - 128 sizeof(bh->b_data); 129 errcode_t retval; 130 131 retval = ext2fs_get_memzero(bufsize, &bh); 132 if (retval) 133 return NULL; 134 135 #ifdef CONFIG_JBD_DEBUG 136 if (journal_enable_debug >= 3) 137 bh_count++; 138 #endif 139 jfs_debug(4, "getblk for block %llu (%d bytes)(total %d)\n", 140 (unsigned long long) blocknr, blocksize, bh_count); 141 142 bh->b_fs = kdev->k_fs; 143 if (kdev->k_dev == K_DEV_FS) 144 bh->b_io = kdev->k_fs->io; 145 else 146 bh->b_io = kdev->k_fs->journal_io; 147 bh->b_size = blocksize; 148 bh->b_blocknr = blocknr; 149 150 return bh; 151 } 152 153 int sync_blockdev(kdev_t kdev) 154 { 155 io_channel io; 156 157 if (kdev->k_dev == K_DEV_FS) 158 io = kdev->k_fs->io; 159 else 160 io = kdev->k_fs->journal_io; 161 162 return io_channel_flush(io) ? EIO : 0; 163 } 164 165 void ll_rw_block(int rw, int nr, struct buffer_head *bhp[]) 166 { 167 errcode_t retval; 168 struct buffer_head *bh; 169 170 for (; nr > 0; --nr) { 171 bh = *bhp++; 172 if (rw == READ && !bh->b_uptodate) { 173 jfs_debug(3, "reading block %llu/%p\n", 174 bh->b_blocknr, (void *) bh); 175 retval = io_channel_read_blk64(bh->b_io, 176 bh->b_blocknr, 177 1, bh->b_data); 178 if (retval) { 179 com_err(bh->b_fs->device_name, retval, 180 "while reading block %llu\n", 181 bh->b_blocknr); 182 bh->b_err = (int) retval; 183 continue; 184 } 185 bh->b_uptodate = 1; 186 } else if (rw == WRITE && bh->b_dirty) { 187 jfs_debug(3, "writing block %llu/%p\n", 188 bh->b_blocknr, 189 (void *) bh); 190 retval = io_channel_write_blk64(bh->b_io, 191 bh->b_blocknr, 192 1, bh->b_data); 193 if (retval) { 194 com_err(bh->b_fs->device_name, retval, 195 "while writing block %llu\n", 196 bh->b_blocknr); 197 bh->b_err = (int) retval; 198 continue; 199 } 200 bh->b_dirty = 0; 201 bh->b_uptodate = 1; 202 } else { 203 jfs_debug(3, "no-op %s for block %llu\n", 204 rw == READ ? "read" : "write", 205 bh->b_blocknr); 206 } 207 } 208 } 209 210 void mark_buffer_dirty(struct buffer_head *bh) 211 { 212 bh->b_dirty = 1; 213 } 214 215 static void mark_buffer_clean(struct buffer_head *bh) 216 { 217 bh->b_dirty = 0; 218 } 219 220 void brelse(struct buffer_head *bh) 221 { 222 if (bh->b_dirty) 223 ll_rw_block(WRITE, 1, &bh); 224 jfs_debug(3, "freeing block %llu/%p (total %d)\n", 225 bh->b_blocknr, (void *) bh, --bh_count); 226 ext2fs_free_mem(&bh); 227 } 228 229 int buffer_uptodate(struct buffer_head *bh) 230 { 231 return bh->b_uptodate; 232 } 233 234 void mark_buffer_uptodate(struct buffer_head *bh, int val) 235 { 236 bh->b_uptodate = val; 237 } 238 239 void wait_on_buffer(struct buffer_head *bh) 240 { 241 if (!bh->b_uptodate) 242 ll_rw_block(READ, 1, &bh); 243 } 244 245 246 static void ext2fs_clear_recover(ext2_filsys fs, int error) 247 { 248 ext2fs_clear_feature_journal_needs_recovery(fs->super); 249 250 /* if we had an error doing journal recovery, we need a full fsck */ 251 if (error) 252 fs->super->s_state &= ~EXT2_VALID_FS; 253 /* 254 * If we replayed the journal by definition the file system 255 * was mounted since the last time it was checked 256 */ 257 if (fs->super->s_lastcheck >= fs->super->s_mtime) 258 fs->super->s_lastcheck = fs->super->s_mtime - 1; 259 ext2fs_mark_super_dirty(fs); 260 } 261 262 /* 263 * This is a helper function to check the validity of the journal. 264 */ 265 struct process_block_struct { 266 e2_blkcnt_t last_block; 267 }; 268 269 static int process_journal_block(ext2_filsys fs, 270 blk64_t *block_nr, 271 e2_blkcnt_t blockcnt, 272 blk64_t ref_block EXT2FS_ATTR((unused)), 273 int ref_offset EXT2FS_ATTR((unused)), 274 void *priv_data) 275 { 276 struct process_block_struct *p; 277 blk64_t blk = *block_nr; 278 279 p = (struct process_block_struct *) priv_data; 280 281 if (!blk || blk < fs->super->s_first_data_block || 282 blk >= ext2fs_blocks_count(fs->super)) 283 return BLOCK_ABORT; 284 285 if (blockcnt >= 0) 286 p->last_block = blockcnt; 287 return 0; 288 } 289 290 static errcode_t ext2fs_get_journal(ext2_filsys fs, journal_t **ret_journal) 291 { 292 struct process_block_struct pb; 293 struct ext2_super_block *sb = fs->super; 294 struct ext2_super_block jsuper; 295 struct buffer_head *bh; 296 struct inode *j_inode = NULL; 297 struct kdev_s *dev_fs = NULL, *dev_journal; 298 const char *journal_name = 0; 299 journal_t *journal = NULL; 300 errcode_t retval = 0; 301 io_manager io_ptr = 0; 302 unsigned long long start = 0; 303 int ext_journal = 0; 304 int tried_backup_jnl = 0; 305 306 retval = ext2fs_get_memzero(sizeof(journal_t), &journal); 307 if (retval) 308 return retval; 309 310 retval = ext2fs_get_memzero(2 * sizeof(struct kdev_s), &dev_fs); 311 if (retval) 312 goto errout; 313 dev_journal = dev_fs+1; 314 315 dev_fs->k_fs = dev_journal->k_fs = fs; 316 dev_fs->k_dev = K_DEV_FS; 317 dev_journal->k_dev = K_DEV_JOURNAL; 318 319 journal->j_dev = dev_journal; 320 journal->j_fs_dev = dev_fs; 321 journal->j_inode = NULL; 322 journal->j_blocksize = fs->blocksize; 323 324 if (uuid_is_null(sb->s_journal_uuid)) { 325 if (!sb->s_journal_inum) { 326 retval = EXT2_ET_BAD_INODE_NUM; 327 goto errout; 328 } 329 retval = ext2fs_get_memzero(sizeof(*j_inode), &j_inode); 330 if (retval) 331 goto errout; 332 333 j_inode->i_fs = fs; 334 j_inode->i_ino = sb->s_journal_inum; 335 336 retval = ext2fs_read_inode(fs, sb->s_journal_inum, 337 &j_inode->i_ext2); 338 if (retval) { 339 try_backup_journal: 340 if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS || 341 tried_backup_jnl) 342 goto errout; 343 memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode)); 344 memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks, 345 EXT2_N_BLOCKS*4); 346 j_inode->i_ext2.i_size_high = sb->s_jnl_blocks[15]; 347 j_inode->i_ext2.i_size = sb->s_jnl_blocks[16]; 348 j_inode->i_ext2.i_links_count = 1; 349 j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600; 350 tried_backup_jnl++; 351 } 352 if (!j_inode->i_ext2.i_links_count || 353 !LINUX_S_ISREG(j_inode->i_ext2.i_mode)) { 354 retval = EXT2_ET_NO_JOURNAL; 355 goto try_backup_journal; 356 } 357 if (EXT2_I_SIZE(&j_inode->i_ext2) / journal->j_blocksize < 358 JFS_MIN_JOURNAL_BLOCKS) { 359 retval = EXT2_ET_JOURNAL_TOO_SMALL; 360 goto try_backup_journal; 361 } 362 pb.last_block = -1; 363 retval = ext2fs_block_iterate3(fs, j_inode->i_ino, 364 BLOCK_FLAG_HOLE, 0, 365 process_journal_block, &pb); 366 if ((pb.last_block + 1) * fs->blocksize < 367 (int) EXT2_I_SIZE(&j_inode->i_ext2)) { 368 retval = EXT2_ET_JOURNAL_TOO_SMALL; 369 goto try_backup_journal; 370 } 371 if (tried_backup_jnl && (fs->flags & EXT2_FLAG_RW)) { 372 retval = ext2fs_write_inode(fs, sb->s_journal_inum, 373 &j_inode->i_ext2); 374 if (retval) 375 goto errout; 376 } 377 378 journal->j_maxlen = EXT2_I_SIZE(&j_inode->i_ext2) / 379 journal->j_blocksize; 380 381 #ifdef USE_INODE_IO 382 retval = ext2fs_inode_io_intern2(fs, sb->s_journal_inum, 383 &j_inode->i_ext2, 384 &journal_name); 385 if (retval) 386 goto errout; 387 388 io_ptr = inode_io_manager; 389 #else 390 journal->j_inode = j_inode; 391 fs->journal_io = fs->io; 392 retval = (errcode_t)journal_bmap(journal, 0, &start); 393 if (retval) 394 goto errout; 395 #endif 396 } else { 397 ext_journal = 1; 398 if (!fs->journal_name) { 399 char uuid[37]; 400 blkid_cache blkid; 401 402 blkid_get_cache(&blkid, NULL); 403 uuid_unparse(sb->s_journal_uuid, uuid); 404 fs->journal_name = blkid_get_devname(blkid, 405 "UUID", uuid); 406 if (!fs->journal_name) 407 fs->journal_name = blkid_devno_to_devname(sb->s_journal_dev); 408 blkid_put_cache(blkid); 409 } 410 journal_name = fs->journal_name; 411 412 if (!journal_name) { 413 retval = EXT2_ET_LOAD_EXT_JOURNAL; 414 goto errout; 415 } 416 417 jfs_debug(1, "Using journal file %s\n", journal_name); 418 io_ptr = unix_io_manager; 419 } 420 421 #if 0 422 test_io_backing_manager = io_ptr; 423 io_ptr = test_io_manager; 424 #endif 425 #ifndef USE_INODE_IO 426 if (ext_journal) 427 #endif 428 { 429 retval = io_ptr->open(journal_name, fs->flags & EXT2_FLAG_RW, 430 &fs->journal_io); 431 } 432 if (retval) 433 goto errout; 434 435 io_channel_set_blksize(fs->journal_io, fs->blocksize); 436 437 if (ext_journal) { 438 blk64_t maxlen; 439 440 start = ext2fs_journal_sb_start(fs->blocksize) - 1; 441 bh = getblk(dev_journal, start, fs->blocksize); 442 if (!bh) { 443 retval = EXT2_ET_NO_MEMORY; 444 goto errout; 445 } 446 ll_rw_block(READ, 1, &bh); 447 retval = bh->b_err; 448 if (retval) { 449 brelse(bh); 450 goto errout; 451 } 452 memcpy(&jsuper, start ? bh->b_data : 453 bh->b_data + SUPERBLOCK_OFFSET, 454 sizeof(jsuper)); 455 #ifdef WORDS_BIGENDIAN 456 if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) 457 ext2fs_swap_super(&jsuper); 458 #endif 459 if (jsuper.s_magic != EXT2_SUPER_MAGIC || 460 !ext2fs_has_feature_journal_dev(&jsuper)) { 461 retval = EXT2_ET_LOAD_EXT_JOURNAL; 462 brelse(bh); 463 goto errout; 464 } 465 /* Make sure the journal UUID is correct */ 466 if (memcmp(jsuper.s_uuid, fs->super->s_journal_uuid, 467 sizeof(jsuper.s_uuid))) { 468 retval = EXT2_ET_LOAD_EXT_JOURNAL; 469 brelse(bh); 470 goto errout; 471 } 472 473 /* Check the superblock checksum */ 474 if (ext2fs_has_feature_metadata_csum(&jsuper)) { 475 struct struct_ext2_filsys fsx; 476 struct ext2_super_block superx; 477 void *p; 478 479 p = start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET; 480 memcpy(&fsx, fs, sizeof(fsx)); 481 memcpy(&superx, fs->super, sizeof(superx)); 482 fsx.super = &superx; 483 ext2fs_set_feature_metadata_csum(fsx.super); 484 if (!ext2fs_superblock_csum_verify(&fsx, p)) { 485 retval = EXT2_ET_LOAD_EXT_JOURNAL; 486 brelse(bh); 487 goto errout; 488 } 489 } 490 brelse(bh); 491 492 maxlen = ext2fs_blocks_count(&jsuper); 493 journal->j_maxlen = (maxlen < 1ULL << 32) ? maxlen : 494 (1ULL << 32) - 1; 495 start++; 496 } 497 498 bh = getblk(dev_journal, start, journal->j_blocksize); 499 if (!bh) { 500 retval = EXT2_ET_NO_MEMORY; 501 goto errout; 502 } 503 504 journal->j_sb_buffer = bh; 505 journal->j_superblock = (journal_superblock_t *)bh->b_data; 506 507 #ifdef USE_INODE_IO 508 if (j_inode) 509 ext2fs_free_mem(&j_inode); 510 #endif 511 512 *ret_journal = journal; 513 return 0; 514 515 errout: 516 if (dev_fs) 517 ext2fs_free_mem(&dev_fs); 518 if (j_inode) 519 ext2fs_free_mem(&j_inode); 520 if (journal) 521 ext2fs_free_mem(&journal); 522 return retval; 523 } 524 525 static errcode_t ext2fs_journal_fix_bad_inode(ext2_filsys fs) 526 { 527 struct ext2_super_block *sb = fs->super; 528 int recover = ext2fs_has_feature_journal_needs_recovery(fs->super); 529 int has_journal = ext2fs_has_feature_journal(fs->super); 530 531 if (has_journal || sb->s_journal_inum) { 532 /* The journal inode is bogus, remove and force full fsck */ 533 return EXT2_ET_BAD_INODE_NUM; 534 } else if (recover) { 535 return EXT2_ET_UNSUPP_FEATURE; 536 } 537 return 0; 538 } 539 540 #define V1_SB_SIZE 0x0024 541 static void clear_v2_journal_fields(journal_t *journal) 542 { 543 ext2_filsys fs = journal->j_dev->k_fs; 544 545 memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0, 546 fs->blocksize-V1_SB_SIZE); 547 mark_buffer_dirty(journal->j_sb_buffer); 548 } 549 550 551 static errcode_t ext2fs_journal_load(journal_t *journal) 552 { 553 ext2_filsys fs = journal->j_dev->k_fs; 554 journal_superblock_t *jsb; 555 struct buffer_head *jbh = journal->j_sb_buffer; 556 557 ll_rw_block(READ, 1, &jbh); 558 if (jbh->b_err) 559 return jbh->b_err; 560 561 jsb = journal->j_superblock; 562 /* If we don't even have JFS_MAGIC, we probably have a wrong inode */ 563 if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER)) 564 return ext2fs_journal_fix_bad_inode(fs); 565 566 switch (ntohl(jsb->s_header.h_blocktype)) { 567 case JFS_SUPERBLOCK_V1: 568 journal->j_format_version = 1; 569 if (jsb->s_feature_compat || 570 jsb->s_feature_incompat || 571 jsb->s_feature_ro_compat || 572 jsb->s_nr_users) 573 clear_v2_journal_fields(journal); 574 break; 575 576 case JFS_SUPERBLOCK_V2: 577 journal->j_format_version = 2; 578 if (ntohl(jsb->s_nr_users) > 1 && 579 uuid_is_null(fs->super->s_journal_uuid)) 580 clear_v2_journal_fields(journal); 581 if (ntohl(jsb->s_nr_users) > 1) 582 return EXT2_ET_JOURNAL_UNSUPP_VERSION; 583 break; 584 585 /* 586 * These should never appear in a journal super block, so if 587 * they do, the journal is badly corrupted. 588 */ 589 case JFS_DESCRIPTOR_BLOCK: 590 case JFS_COMMIT_BLOCK: 591 case JFS_REVOKE_BLOCK: 592 return EXT2_ET_CORRUPT_JOURNAL_SB; 593 594 /* If we don't understand the superblock major type, but there 595 * is a magic number, then it is likely to be a new format we 596 * just don't understand, so leave it alone. */ 597 default: 598 return EXT2_ET_JOURNAL_UNSUPP_VERSION; 599 } 600 601 if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES)) 602 return EXT2_ET_UNSUPP_FEATURE; 603 604 if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES)) 605 return EXT2_ET_RO_UNSUPP_FEATURE; 606 607 /* Checksum v1-3 are mutually exclusive features. */ 608 if (jfs_has_feature_csum2(journal) && jfs_has_feature_csum3(journal)) 609 return EXT2_ET_CORRUPT_JOURNAL_SB; 610 611 if (journal_has_csum_v2or3(journal) && 612 jfs_has_feature_checksum(journal)) 613 return EXT2_ET_CORRUPT_JOURNAL_SB; 614 615 if (!ext2fs_journal_verify_csum_type(journal, jsb) || 616 !ext2fs_journal_sb_csum_verify(journal, jsb)) 617 return EXT2_ET_CORRUPT_JOURNAL_SB; 618 619 if (journal_has_csum_v2or3(journal)) 620 journal->j_csum_seed = jbd2_chksum(journal, ~0, jsb->s_uuid, 621 sizeof(jsb->s_uuid)); 622 623 /* We have now checked whether we know enough about the journal 624 * format to be able to proceed safely, so any other checks that 625 * fail we should attempt to recover from. */ 626 if (jsb->s_blocksize != htonl(journal->j_blocksize)) 627 return EXT2_ET_CORRUPT_JOURNAL_SB; 628 629 if (ntohl(jsb->s_maxlen) < journal->j_maxlen) 630 journal->j_maxlen = ntohl(jsb->s_maxlen); 631 else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) 632 return EXT2_ET_CORRUPT_JOURNAL_SB; 633 634 journal->j_tail_sequence = ntohl(jsb->s_sequence); 635 journal->j_transaction_sequence = journal->j_tail_sequence; 636 journal->j_tail = ntohl(jsb->s_start); 637 journal->j_first = ntohl(jsb->s_first); 638 journal->j_last = ntohl(jsb->s_maxlen); 639 640 return 0; 641 } 642 643 static void ext2fs_journal_release(ext2_filsys fs, journal_t *journal, 644 int reset, int drop) 645 { 646 journal_superblock_t *jsb; 647 648 if (drop) 649 mark_buffer_clean(journal->j_sb_buffer); 650 else if (fs->flags & EXT2_FLAG_RW) { 651 jsb = journal->j_superblock; 652 jsb->s_sequence = htonl(journal->j_tail_sequence); 653 if (reset) 654 jsb->s_start = 0; /* this marks the journal as empty */ 655 ext2fs_journal_sb_csum_set(journal, jsb); 656 mark_buffer_dirty(journal->j_sb_buffer); 657 } 658 brelse(journal->j_sb_buffer); 659 660 if (fs && fs->journal_io) { 661 if (fs->io != fs->journal_io) 662 io_channel_close(fs->journal_io); 663 fs->journal_io = NULL; 664 free(fs->journal_name); 665 fs->journal_name = NULL; 666 } 667 668 #ifndef USE_INODE_IO 669 if (journal->j_inode) 670 ext2fs_free_mem(&journal->j_inode); 671 #endif 672 if (journal->j_fs_dev) 673 ext2fs_free_mem(&journal->j_fs_dev); 674 ext2fs_free_mem(&journal); 675 } 676 677 /* 678 * This function makes sure that the superblock fields regarding the 679 * journal are consistent. 680 */ 681 static errcode_t ext2fs_check_ext3_journal(ext2_filsys fs) 682 { 683 struct ext2_super_block *sb = fs->super; 684 journal_t *journal; 685 int recover = ext2fs_has_feature_journal_needs_recovery(fs->super); 686 errcode_t retval; 687 688 /* If we don't have any journal features, don't do anything more */ 689 if (!ext2fs_has_feature_journal(sb) && 690 !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 && 691 uuid_is_null(sb->s_journal_uuid)) 692 return 0; 693 694 retval = ext2fs_get_journal(fs, &journal); 695 if (retval) 696 return retval; 697 698 retval = ext2fs_journal_load(journal); 699 if (retval) 700 goto err; 701 702 /* 703 * We want to make the flags consistent here. We will not leave with 704 * needs_recovery set but has_journal clear. We can't get in a loop 705 * with -y, -n, or -p, only if a user isn't making up their mind. 706 */ 707 if (!ext2fs_has_feature_journal(sb)) { 708 retval = EXT2_ET_JOURNAL_FLAGS_WRONG; 709 goto err; 710 } 711 712 if (ext2fs_has_feature_journal(sb) && 713 !ext2fs_has_feature_journal_needs_recovery(sb) && 714 journal->j_superblock->s_start != 0) { 715 retval = EXT2_ET_JOURNAL_FLAGS_WRONG; 716 goto err; 717 } 718 719 /* 720 * If we don't need to do replay the journal, check to see if 721 * the journal's errno is set; if so, we need to mark the file 722 * system as being corrupt and clear the journal's s_errno. 723 */ 724 if (!ext2fs_has_feature_journal_needs_recovery(sb) && 725 journal->j_superblock->s_errno) { 726 fs->super->s_state |= EXT2_ERROR_FS; 727 ext2fs_mark_super_dirty(fs); 728 journal->j_superblock->s_errno = 0; 729 ext2fs_journal_sb_csum_set(journal, journal->j_superblock); 730 mark_buffer_dirty(journal->j_sb_buffer); 731 } 732 733 err: 734 ext2fs_journal_release(fs, journal, 0, retval ? 1 : 0); 735 return retval; 736 } 737 738 static errcode_t recover_ext3_journal(ext2_filsys fs) 739 { 740 journal_t *journal; 741 errcode_t retval; 742 743 journal_init_revoke_caches(); 744 retval = ext2fs_get_journal(fs, &journal); 745 if (retval) 746 return retval; 747 748 retval = ext2fs_journal_load(journal); 749 if (retval) 750 goto errout; 751 752 retval = journal_init_revoke(journal, 1024); 753 if (retval) 754 goto errout; 755 756 retval = -journal_recover(journal); 757 if (retval) 758 goto errout; 759 760 if (journal->j_failed_commit) { 761 journal->j_superblock->s_errno = -EINVAL; 762 mark_buffer_dirty(journal->j_sb_buffer); 763 } 764 765 errout: 766 journal_destroy_revoke(journal); 767 journal_destroy_revoke_caches(); 768 ext2fs_journal_release(fs, journal, 1, 0); 769 return retval; 770 } 771 772 errcode_t ext2fs_run_ext3_journal(ext2_filsys *fsp) 773 { 774 ext2_filsys fs = *fsp; 775 io_manager io_ptr = fs->io->manager; 776 errcode_t retval, recover_retval; 777 io_stats stats = 0; 778 unsigned long long kbytes_written = 0; 779 char *fsname; 780 int fsflags; 781 int fsblocksize; 782 783 if (!(fs->flags & EXT2_FLAG_RW)) 784 return EXT2_ET_FILE_RO; 785 786 if (fs->flags & EXT2_FLAG_DIRTY) 787 ext2fs_flush(fs); /* Force out any modifications */ 788 789 recover_retval = recover_ext3_journal(fs); 790 791 /* 792 * Reload the filesystem context to get up-to-date data from disk 793 * because journal recovery will change the filesystem under us. 794 */ 795 if (fs->super->s_kbytes_written && 796 fs->io->manager->get_stats) 797 fs->io->manager->get_stats(fs->io, &stats); 798 if (stats && stats->bytes_written) 799 kbytes_written = stats->bytes_written >> 10; 800 801 ext2fs_mmp_stop(fs); 802 fsname = fs->device_name; 803 fs->device_name = NULL; 804 fsflags = fs->flags; 805 fsblocksize = fs->blocksize; 806 ext2fs_free(fs); 807 *fsp = NULL; 808 retval = ext2fs_open(fsname, fsflags, 0, fsblocksize, io_ptr, fsp); 809 ext2fs_free_mem(&fsname); 810 if (retval) 811 return retval; 812 813 fs = *fsp; 814 fs->flags |= EXT2_FLAG_MASTER_SB_ONLY; 815 fs->super->s_kbytes_written += kbytes_written; 816 817 /* Set the superblock flags */ 818 ext2fs_clear_recover(fs, recover_retval != 0); 819 820 /* 821 * Do one last sanity check, and propagate journal->s_errno to 822 * the EXT2_ERROR_FS flag in the fs superblock if needed. 823 */ 824 retval = ext2fs_check_ext3_journal(fs); 825 return retval ? retval : recover_retval; 826 } 827 828 errcode_t ext2fs_open_journal(ext2_filsys fs, journal_t **j) 829 { 830 journal_t *journal; 831 errcode_t retval; 832 833 journal_init_revoke_caches(); 834 retval = ext2fs_get_journal(fs, &journal); 835 if (retval) 836 return retval; 837 838 retval = ext2fs_journal_load(journal); 839 if (retval) 840 goto errout; 841 842 retval = journal_init_revoke(journal, 1024); 843 if (retval) 844 goto errout; 845 846 if (journal->j_failed_commit) { 847 journal->j_superblock->s_errno = -EINVAL; 848 mark_buffer_dirty(journal->j_sb_buffer); 849 } 850 851 *j = journal; 852 return 0; 853 854 errout: 855 journal_destroy_revoke(journal); 856 journal_destroy_revoke_caches(); 857 ext2fs_journal_release(fs, journal, 1, 0); 858 return retval; 859 } 860 861 errcode_t ext2fs_close_journal(ext2_filsys fs, journal_t **j) 862 { 863 journal_t *journal = *j; 864 865 journal_destroy_revoke(journal); 866 journal_destroy_revoke_caches(); 867 ext2fs_journal_release(fs, journal, 0, 0); 868 *j = NULL; 869 870 return 0; 871 } 872 873 void jbd2_commit_block_csum_set(journal_t *j, struct buffer_head *bh) 874 { 875 struct commit_header *h; 876 __u32 csum; 877 878 if (!journal_has_csum_v2or3(j)) 879 return; 880 881 h = (struct commit_header *)(bh->b_data); 882 h->h_chksum_type = 0; 883 h->h_chksum_size = 0; 884 h->h_chksum[0] = 0; 885 csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize); 886 h->h_chksum[0] = ext2fs_cpu_to_be32(csum); 887 } 888 889 void jbd2_revoke_csum_set(journal_t *j, struct buffer_head *bh) 890 { 891 struct journal_revoke_tail *tail; 892 __u32 csum; 893 894 if (!journal_has_csum_v2or3(j)) 895 return; 896 897 tail = (struct journal_revoke_tail *)(bh->b_data + j->j_blocksize - 898 sizeof(struct journal_revoke_tail)); 899 tail->r_checksum = 0; 900 csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize); 901 tail->r_checksum = ext2fs_cpu_to_be32(csum); 902 } 903 904 void jbd2_descr_block_csum_set(journal_t *j, struct buffer_head *bh) 905 { 906 struct journal_block_tail *tail; 907 __u32 csum; 908 909 if (!journal_has_csum_v2or3(j)) 910 return; 911 912 tail = (struct journal_block_tail *)(bh->b_data + j->j_blocksize - 913 sizeof(struct journal_block_tail)); 914 tail->t_checksum = 0; 915 csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize); 916 tail->t_checksum = ext2fs_cpu_to_be32(csum); 917 } 918 919 void jbd2_block_tag_csum_set(journal_t *j, journal_block_tag_t *tag, 920 struct buffer_head *bh, __u32 sequence) 921 { 922 journal_block_tag3_t *tag3 = (journal_block_tag3_t *)tag; 923 __u32 csum32; 924 __be32 seq; 925 926 if (!journal_has_csum_v2or3(j)) 927 return; 928 929 seq = ext2fs_cpu_to_be32(sequence); 930 csum32 = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&seq, sizeof(seq)); 931 csum32 = jbd2_chksum(j, csum32, bh->b_data, bh->b_size); 932 933 if (jfs_has_feature_csum3(j)) 934 tag3->t_checksum = ext2fs_cpu_to_be32(csum32); 935 else 936 tag->t_checksum = ext2fs_cpu_to_be16(csum32); 937 } 938 939
