journal.c revision 6d222f3217b11c9b27f92b4aafe47bfeb59b81fa
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/mount.h> 17#define MNT_FL (MS_MGC_VAL | MS_RDONLY) 18#endif 19#ifdef HAVE_SYS_STAT_H 20#include <sys/stat.h> 21#endif 22 23#define E2FSCK_INCLUDE_INLINE_FUNCS 24#include "jfs_user.h" 25#include "problem.h" 26#include "uuid/uuid.h" 27 28#ifdef JFS_DEBUG /* Enabled by configure --enable-jfs-debug */ 29static int bh_count = 0; 30int journal_enable_debug = 2; 31#endif 32 33/* Kernel compatibility functions for handling the journal. These allow us 34 * to use the recovery.c file virtually unchanged from the kernel, so we 35 * don't have to do much to keep kernel and user recovery in sync. 36 */ 37int bmap(struct inode *inode, int block) 38{ 39 int retval; 40 blk_t phys; 41 42 retval = ext2fs_bmap(inode->i_ctx->fs, inode->i_ino, &inode->i_ext2, 43 NULL, 0, block, &phys); 44 45 if (retval) 46 com_err(inode->i_ctx->device_name, retval, 47 _("bmap journal inode %ld, block %d\n"), 48 inode->i_ino, block); 49 50 return phys; 51} 52 53struct buffer_head *getblk(e2fsck_t ctx, blk_t blocknr, int blocksize) 54{ 55 struct buffer_head *bh; 56 57 bh = e2fsck_allocate_memory(ctx, sizeof(*bh), "block buffer"); 58 if (!bh) 59 return NULL; 60 61 jfs_debug(4, "getblk for block %lu (%d bytes)(total %d)\n", 62 (unsigned long) blocknr, blocksize, ++bh_count); 63 64 bh->b_ctx = ctx; 65 bh->b_size = blocksize; 66 bh->b_blocknr = blocknr; 67 68 return bh; 69} 70 71void ll_rw_block(int rw, int nr, struct buffer_head *bhp[]) 72{ 73 int retval; 74 struct buffer_head *bh; 75 76 for (; nr > 0; --nr) { 77 bh = *bhp++; 78 if (rw == READ && !bh->b_uptodate) { 79 jfs_debug(3, "reading block %lu/%p\n", 80 (unsigned long) bh->b_blocknr, (void *) bh); 81 retval = io_channel_read_blk(bh->b_ctx->journal_io, 82 bh->b_blocknr, 83 1, bh->b_data); 84 if (retval) { 85 com_err(bh->b_ctx->device_name, retval, 86 "while reading block %ld\n", 87 bh->b_blocknr); 88 bh->b_err = retval; 89 continue; 90 } 91 bh->b_uptodate = 1; 92 } else if (rw == WRITE && bh->b_dirty) { 93 jfs_debug(3, "writing block %lu/%p\n", 94 (unsigned long) bh->b_blocknr, (void *) bh); 95 retval = io_channel_write_blk(bh->b_ctx->journal_io, 96 bh->b_blocknr, 97 1, bh->b_data); 98 if (retval) { 99 com_err(bh->b_ctx->device_name, retval, 100 "while writing block %ld\n", 101 bh->b_blocknr); 102 bh->b_err = retval; 103 continue; 104 } 105 bh->b_dirty = 0; 106 bh->b_uptodate = 1; 107 } else 108 jfs_debug(3, "no-op %s for block %lu\n", 109 rw == READ ? "read" : "write", 110 (unsigned long) bh->b_blocknr); 111 } 112} 113 114void mark_buffer_dirty(struct buffer_head *bh, int dummy) 115{ 116 bh->b_dirty = dummy | 1; /* use dummy to avoid unused variable */ 117} 118 119static void mark_buffer_clean(struct buffer_head * bh) 120{ 121 bh->b_dirty = 0; 122} 123 124void brelse(struct buffer_head *bh) 125{ 126 if (bh->b_dirty) 127 ll_rw_block(WRITE, 1, &bh); 128 jfs_debug(3, "freeing block %lu/%p (total %d)\n", 129 (unsigned long) bh->b_blocknr, (void *) bh, --bh_count); 130 ext2fs_free_mem((void **) &bh); 131} 132 133int buffer_uptodate(struct buffer_head *bh) 134{ 135 return bh->b_uptodate; 136} 137 138void mark_buffer_uptodate(struct buffer_head *bh, int val) 139{ 140 bh->b_uptodate = val; 141} 142 143void wait_on_buffer(struct buffer_head *bh) 144{ 145 if (!bh->b_uptodate) 146 ll_rw_block(READ, 1, &bh); 147} 148 149 150static void e2fsck_clear_recover(e2fsck_t ctx, int error) 151{ 152 ctx->fs->super->s_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER; 153 154 /* if we had an error doing journal recovery, we need a full fsck */ 155 if (error) 156 ctx->fs->super->s_state &= ~EXT2_VALID_FS; 157 ext2fs_mark_super_dirty(ctx->fs); 158} 159 160static errcode_t e2fsck_journal_init_inode(e2fsck_t ctx, 161 struct ext2_super_block *s, 162 journal_t **journal) 163{ 164 struct inode *inode; 165 struct buffer_head *bh; 166 blk_t start; 167 int retval; 168 169 jfs_debug(1, "Using journal inode %u\n", s->s_journal_inum); 170 *journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal"); 171 if (!*journal) { 172 return EXT2_ET_NO_MEMORY; 173 } 174 175 inode = e2fsck_allocate_memory(ctx, sizeof(*inode), "journal inode"); 176 if (!inode) { 177 retval = EXT2_ET_NO_MEMORY; 178 goto exit_journal; 179 } 180 181 inode->i_ctx = ctx; 182 inode->i_ino = s->s_journal_inum; 183 retval = ext2fs_read_inode(ctx->fs, s->s_journal_inum, &inode->i_ext2); 184 if (retval) 185 goto exit_inode; 186 187 (*journal)->j_dev = ctx; 188 (*journal)->j_inode = inode; 189 (*journal)->j_blocksize = ctx->fs->blocksize; 190 (*journal)->j_maxlen = inode->i_ext2.i_size / (*journal)->j_blocksize; 191 ctx->journal_io = ctx->fs->io; 192 193 if (!inode->i_ext2.i_links_count || 194 !LINUX_S_ISREG(inode->i_ext2.i_mode) || 195 (*journal)->j_maxlen < JFS_MIN_JOURNAL_BLOCKS || 196 (start = bmap(inode, 0)) == 0) { 197 retval = EXT2_ET_BAD_INODE_NUM; 198 goto exit_inode; 199 } 200 201 bh = getblk(ctx, start, (*journal)->j_blocksize); 202 if (!bh) { 203 retval = EXT2_ET_NO_MEMORY; 204 goto exit_inode; 205 } 206 (*journal)->j_sb_buffer = bh; 207 (*journal)->j_superblock = (journal_superblock_t *)bh->b_data; 208 209 return 0; 210 211exit_inode: 212 ext2fs_free_mem((void **)&inode); 213exit_journal: 214 ext2fs_free_mem((void **)journal); 215 216 return retval; 217} 218 219static errcode_t e2fsck_journal_init_dev(e2fsck_t ctx, 220 struct ext2_super_block *s, 221 journal_t **journal) 222{ 223 struct buffer_head *bh; 224 io_manager io_ptr; 225 blk_t start; 226 int retval; 227 int blocksize = ctx->fs->blocksize; 228 struct ext2_super_block jsuper; 229 struct problem_context pctx; 230 const char *journal_name; 231 232 clear_problem_context(&pctx); 233 journal_name = ctx->journal_name; 234 if (!journal_name) 235 journal_name = ext2fs_find_block_device(s->s_journal_dev); 236 237 if (!journal_name) { 238 fix_problem(ctx, PR_0_CANT_FIND_JOURNAL, &pctx); 239 return EXT2_ET_LOAD_EXT_JOURNAL; 240 } 241 242 jfs_debug(1, "Using journal file %s\n", journal_name); 243 244#if 1 245 io_ptr = unix_io_manager; 246#else 247 io_ptr = test_io_manager; 248 test_io_backing_manager = unix_io_manager; 249#endif 250 retval = io_ptr->open(journal_name, IO_FLAG_RW, &ctx->journal_io); 251 if (!ctx->journal_name) 252 free((void *) journal_name); 253 if (retval) 254 return retval; 255 256 io_channel_set_blksize(ctx->journal_io, blocksize); 257 start = (blocksize == 1024) ? 1 : 0; 258 bh = getblk(ctx, start, blocksize); 259 if (!bh) 260 return EXT2_ET_NO_MEMORY; 261 ll_rw_block(READ, 1, &bh); 262 if (bh->b_err) 263 return bh->b_err; 264 memcpy(&jsuper, start ? bh->b_data : bh->b_data + 1024, 265 sizeof(jsuper)); 266 brelse(bh); 267#ifdef EXT2FS_ENABLE_SWAPFS 268 if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) 269 ext2fs_swap_super(&jsuper); 270#endif 271 if (jsuper.s_magic != EXT2_SUPER_MAGIC || 272 !(jsuper.s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { 273 fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx); 274 return EXT2_ET_LOAD_EXT_JOURNAL; 275 } 276 /* Make sure the journal UUID is correct */ 277 if (memcmp(jsuper.s_uuid, ctx->fs->super->s_journal_uuid, 278 sizeof(jsuper.s_uuid))) { 279 fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx); 280 return EXT2_ET_LOAD_EXT_JOURNAL; 281 } 282 283 *journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal"); 284 if (!*journal) { 285 return EXT2_ET_NO_MEMORY; 286 } 287 288 (*journal)->j_dev = ctx; 289 (*journal)->j_inode = NULL; 290 (*journal)->j_blocksize = ctx->fs->blocksize; 291 (*journal)->j_maxlen = jsuper.s_blocks_count; 292 293 bh = getblk(ctx, start+1, (*journal)->j_blocksize); 294 if (!bh) { 295 retval = EXT2_ET_NO_MEMORY; 296 goto errout; 297 } 298 (*journal)->j_sb_buffer = bh; 299 (*journal)->j_superblock = (journal_superblock_t *)bh->b_data; 300 301 return 0; 302 303errout: 304 ext2fs_free_mem((void **)journal); 305 return retval; 306} 307 308static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **journal) 309{ 310 struct ext2_super_block *sb = ctx->fs->super; 311 312 if (uuid_is_null(sb->s_journal_uuid)) { 313 if (!sb->s_journal_inum) 314 return EXT2_ET_BAD_INODE_NUM; 315 return e2fsck_journal_init_inode(ctx, sb, journal); 316 } else { 317 return e2fsck_journal_init_dev(ctx, sb, journal); 318 } 319} 320 321static errcode_t e2fsck_journal_fix_bad_inode(e2fsck_t ctx, 322 struct problem_context *pctx) 323{ 324 struct ext2_super_block *sb = ctx->fs->super; 325 int recover = ctx->fs->super->s_feature_incompat & 326 EXT3_FEATURE_INCOMPAT_RECOVER; 327 int has_journal = ctx->fs->super->s_feature_compat & 328 EXT3_FEATURE_COMPAT_HAS_JOURNAL; 329 330 if (has_journal || sb->s_journal_inum) { 331 /* The journal inode is bogus, remove and force full fsck */ 332 pctx->ino = sb->s_journal_inum; 333 if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) { 334 if (has_journal && sb->s_journal_inum) 335 printf("*** ext3 journal has been deleted - " 336 "filesystem is now ext2 only ***\n\n"); 337 sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL; 338 sb->s_journal_inum = 0; 339 ctx->flags |= E2F_FLAG_JOURNAL_INODE; /* FIXME: todo */ 340 e2fsck_clear_recover(ctx, 1); 341 return 0; 342 } 343 return EXT2_ET_BAD_INODE_NUM; 344 } else if (recover) { 345 if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) { 346 e2fsck_clear_recover(ctx, 1); 347 return 0; 348 } 349 return EXT2_ET_UNSUPP_FEATURE; 350 } 351 return 0; 352} 353 354static errcode_t e2fsck_journal_load(journal_t *journal) 355{ 356 e2fsck_t ctx = journal->j_dev; 357 journal_superblock_t *jsb; 358 struct buffer_head *jbh = journal->j_sb_buffer; 359 struct problem_context pctx; 360 361 clear_problem_context(&pctx); 362 363 ll_rw_block(READ, 1, &jbh); 364 if (jbh->b_err) { 365 com_err(ctx->device_name, jbh->b_err, 366 _("reading journal superblock\n")); 367 return jbh->b_err; 368 } 369 370 jsb = journal->j_superblock; 371 /* If we don't even have JFS_MAGIC, we probably have a wrong inode */ 372 if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER)) 373 return e2fsck_journal_fix_bad_inode(ctx, &pctx); 374 375 switch (ntohl(jsb->s_header.h_blocktype)) { 376 case JFS_SUPERBLOCK_V1: 377 journal->j_format_version = 1; 378 break; 379 380 case JFS_SUPERBLOCK_V2: 381 journal->j_format_version = 2; 382 if (ntohl(jsb->s_nr_users) > 1) { 383 fix_problem(ctx, PR_0_JOURNAL_UNSUPP_MULTIFS, &pctx); 384 return EXT2_ET_JOURNAL_UNSUPP_VERSION; 385 } 386 break; 387 388 /* 389 * These should never appear in a journal super block, so if 390 * they do, the journal is badly corrupted. 391 */ 392 case JFS_DESCRIPTOR_BLOCK: 393 case JFS_COMMIT_BLOCK: 394 case JFS_REVOKE_BLOCK: 395 return EXT2_ET_CORRUPT_SUPERBLOCK; 396 397 /* If we don't understand the superblock major type, but there 398 * is a magic number, then it is likely to be a new format we 399 * just don't understand, so leave it alone. */ 400 default: 401 return EXT2_ET_JOURNAL_UNSUPP_VERSION; 402 } 403 404 if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES)) 405 return EXT2_ET_UNSUPP_FEATURE; 406 407 if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES)) 408 return EXT2_ET_RO_UNSUPP_FEATURE; 409 410 /* We have now checked whether we know enough about the journal 411 * format to be able to proceed safely, so any other checks that 412 * fail we should attempt to recover from. */ 413 if (jsb->s_blocksize != htonl(journal->j_blocksize)) { 414 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK, 415 _("%s: no valid journal superblock found\n"), 416 ctx->device_name); 417 return EXT2_ET_CORRUPT_SUPERBLOCK; 418 } 419 420 if (ntohl(jsb->s_maxlen) < journal->j_maxlen) 421 journal->j_maxlen = ntohl(jsb->s_maxlen); 422 else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) { 423 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK, 424 _("%s: journal too short\n"), 425 ctx->device_name); 426 return EXT2_ET_CORRUPT_SUPERBLOCK; 427 } 428 429 journal->j_tail_sequence = ntohl(jsb->s_sequence); 430 journal->j_transaction_sequence = journal->j_tail_sequence; 431 journal->j_tail = ntohl(jsb->s_start); 432 journal->j_first = ntohl(jsb->s_first); 433 journal->j_last = ntohl(jsb->s_maxlen); 434 435 return 0; 436} 437 438static void e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb, 439 journal_t *journal) 440{ 441 char *p; 442 union { 443 uuid_t uuid; 444 __u32 val[4]; 445 } u; 446 __u32 new_seq = 0; 447 int i; 448 449 /* Leave a valid existing V1 superblock signature alone. 450 * Anything unrecognisable we overwrite with a new V2 451 * signature. */ 452 453 if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER) || 454 jsb->s_header.h_blocktype != htonl(JFS_SUPERBLOCK_V1)) { 455 jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER); 456 jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2); 457 } 458 459 /* Zero out everything else beyond the superblock header */ 460 461 p = ((char *) jsb) + sizeof(journal_header_t); 462 memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t)); 463 464 jsb->s_blocksize = htonl(ctx->fs->blocksize); 465 jsb->s_maxlen = htonl(journal->j_maxlen); 466 jsb->s_first = htonl(1); 467 468 /* Initialize the journal sequence number so that there is "no" 469 * chance we will find old "valid" transactions in the journal. 470 * This avoids the need to zero the whole journal (slow to do, 471 * and risky when we are just recovering the filesystem). 472 */ 473 uuid_generate(u.uuid); 474 for (i = 0; i < 4; i ++) 475 new_seq ^= u.val[i]; 476 jsb->s_sequence = htonl(new_seq); 477 478 mark_buffer_dirty(journal->j_sb_buffer, 1); 479 ll_rw_block(WRITE, 1, &journal->j_sb_buffer); 480} 481 482static errcode_t e2fsck_journal_fix_corrupt_super(e2fsck_t ctx, 483 journal_t *journal, 484 struct problem_context *pctx) 485{ 486 struct ext2_super_block *sb = ctx->fs->super; 487 int recover = ctx->fs->super->s_feature_incompat & 488 EXT3_FEATURE_INCOMPAT_RECOVER; 489 490 pctx->num = journal->j_inode->i_ino; 491 492 if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) { 493 if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) { 494 e2fsck_journal_reset_super(ctx, journal->j_superblock, 495 journal); 496 journal->j_transaction_sequence = 1; 497 e2fsck_clear_recover(ctx, recover); 498 return 0; 499 } 500 return EXT2_ET_CORRUPT_SUPERBLOCK; 501 } else if (e2fsck_journal_fix_bad_inode(ctx, pctx)) 502 return EXT2_ET_CORRUPT_SUPERBLOCK; 503 504 return 0; 505} 506 507static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal, 508 int reset, int drop) 509{ 510 journal_superblock_t *jsb; 511 512 if (drop) 513 mark_buffer_clean(journal->j_sb_buffer); 514 else if (!(ctx->options & E2F_OPT_READONLY)) { 515 jsb = journal->j_superblock; 516 jsb->s_sequence = htonl(journal->j_transaction_sequence); 517 if (reset) 518 jsb->s_start = 0; /* this marks the journal as empty */ 519 mark_buffer_dirty(journal->j_sb_buffer, 1); 520 } 521 brelse(journal->j_sb_buffer); 522 523 if (ctx->journal_io) { 524 if (ctx->fs && ctx->fs->io != ctx->journal_io) 525 io_channel_close(ctx->journal_io); 526 ctx->journal_io = 0; 527 } 528 529 if (journal->j_inode) 530 ext2fs_free_mem((void **)&journal->j_inode); 531 ext2fs_free_mem((void **)&journal); 532} 533 534/* 535 * This function makes sure that the superblock fields regarding the 536 * journal are consistent. 537 */ 538int e2fsck_check_ext3_journal(e2fsck_t ctx) 539{ 540 struct ext2_super_block *sb = ctx->fs->super; 541 journal_t *journal; 542 int recover = ctx->fs->super->s_feature_incompat & 543 EXT3_FEATURE_INCOMPAT_RECOVER; 544 struct problem_context pctx; 545 int reset = 0, force_fsck = 0; 546 int retval; 547 548 /* If we don't have any journal features, don't do anything more */ 549 if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) && 550 !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 && 551 uuid_is_null(sb->s_journal_uuid)) 552 return 0; 553 554 clear_problem_context(&pctx); 555 pctx.num = sb->s_journal_inum; 556 557 retval = e2fsck_get_journal(ctx, &journal); 558 if (retval) { 559 if (retval == EXT2_ET_BAD_INODE_NUM) 560 return e2fsck_journal_fix_bad_inode(ctx, &pctx); 561 return retval; 562 } 563 564 retval = e2fsck_journal_load(journal); 565 if (retval) { 566 if ((retval == EXT2_ET_CORRUPT_SUPERBLOCK) || 567 ((retval == EXT2_ET_UNSUPP_FEATURE) && 568 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_INCOMPAT, 569 &pctx))) || 570 ((retval == EXT2_ET_RO_UNSUPP_FEATURE) && 571 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_ROCOMPAT, 572 &pctx))) || 573 ((retval == EXT2_ET_JOURNAL_UNSUPP_VERSION) && 574 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_VERSION, &pctx)))) 575 retval = e2fsck_journal_fix_corrupt_super(ctx, journal, 576 &pctx); 577 e2fsck_journal_release(ctx, journal, 0, 1); 578 return retval; 579 } 580 581 /* 582 * We want to make the flags consistent here. We will not leave with 583 * needs_recovery set but has_journal clear. We can't get in a loop 584 * with -y, -n, or -p, only if a user isn't making up their mind. 585 */ 586no_has_journal: 587 if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) { 588 recover = sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER; 589 pctx.str = "inode"; 590 if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) { 591 if (recover && 592 !fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx)) 593 goto no_has_journal; 594 /* 595 * Need a full fsck if we are releasing a 596 * journal stored on a reserved inode. 597 */ 598 force_fsck = recover || 599 (sb->s_journal_inum < EXT2_FIRST_INODE(sb)); 600 /* Clear all of the journal fields */ 601 sb->s_journal_inum = 0; 602 sb->s_journal_dev = 0; 603 memset(sb->s_journal_uuid, 0, 604 sizeof(sb->s_journal_uuid)); 605 e2fsck_clear_recover(ctx, force_fsck); 606 } else if (!(ctx->options & E2F_OPT_READONLY)) { 607 sb->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL; 608 ext2fs_mark_super_dirty(ctx->fs); 609 } 610 } 611 612 if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL && 613 !(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) && 614 journal->j_superblock->s_start != 0) { 615 if (fix_problem(ctx, PR_0_JOURNAL_RESET_JOURNAL, &pctx)) { 616 reset = 1; 617 sb->s_state &= ~EXT2_VALID_FS; 618 ext2fs_mark_super_dirty(ctx->fs); 619 } 620 /* 621 * If the user answers no to the above question, we 622 * ignore the fact that journal apparently has data; 623 * accidentally replaying over valid data would be far 624 * worse than skipping a questionable recovery. 625 * 626 * XXX should we abort with a fatal error here? What 627 * will the ext3 kernel code do if a filesystem with 628 * !NEEDS_RECOVERY but with a non-zero 629 * journal->j_superblock->s_start is mounted? 630 */ 631 } 632 633 e2fsck_journal_release(ctx, journal, reset, 0); 634 return retval; 635} 636 637static errcode_t recover_ext3_journal(e2fsck_t ctx) 638{ 639 journal_t *journal; 640 int retval; 641 642 retval = e2fsck_get_journal(ctx, &journal); 643 if (retval) 644 return retval; 645 646 retval = e2fsck_journal_load(journal); 647 if (retval) 648 goto errout; 649 650 retval = journal_init_revoke(journal, 1024); 651 if (retval) 652 goto errout; 653 654 retval = -journal_recover(journal); 655errout: 656 e2fsck_journal_release(ctx, journal, 1, 0); 657 return retval; 658} 659 660int e2fsck_run_ext3_journal(e2fsck_t ctx) 661{ 662 io_manager io_ptr = ctx->fs->io->manager; 663 int blocksize = ctx->fs->blocksize; 664 errcode_t retval, recover_retval; 665 666 printf(_("%s: recovering journal\n"), ctx->device_name); 667 if (ctx->options & E2F_OPT_READONLY) { 668 printf(_("%s: won't do journal recovery while read-only\n"), 669 ctx->device_name); 670 return EXT2_ET_FILE_RO; 671 } 672 673 if (ctx->fs->flags & EXT2_FLAG_DIRTY) 674 ext2fs_flush(ctx->fs); /* Force out any modifications */ 675 676 recover_retval = recover_ext3_journal(ctx); 677 678 /* 679 * Reload the filesystem context to get up-to-date data from disk 680 * because journal recovery will change the filesystem under us. 681 */ 682 ext2fs_close(ctx->fs); 683 retval = ext2fs_open(ctx->filesystem_name, EXT2_FLAG_RW, 684 ctx->superblock, blocksize, io_ptr, 685 &ctx->fs); 686 687 if (retval) { 688 com_err(ctx->program_name, retval, 689 _("while trying to re-open %s"), 690 ctx->device_name); 691 fatal_error(ctx, 0); 692 } 693 ctx->fs->priv_data = ctx; 694 695 /* Set the superblock flags */ 696 e2fsck_clear_recover(ctx, recover_retval); 697 return recover_retval; 698} 699