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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 | // SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2017 Oracle. All Rights Reserved. * Author: Darrick J. Wong <darrick.wong@oracle.com> */ #include "xfs.h" #include "xfs_fs.h" #include "xfs_shared.h" #include "xfs_format.h" #include "xfs_trans_resv.h" #include "xfs_mount.h" #include "xfs_btree.h" #include "xfs_bit.h" #include "xfs_log_format.h" #include "xfs_trans.h" #include "xfs_inode.h" #include "xfs_alloc.h" #include "xfs_bmap.h" #include "xfs_bmap_btree.h" #include "xfs_rmap.h" #include "xfs_rmap_btree.h" #include "scrub/scrub.h" #include "scrub/common.h" #include "scrub/btree.h" #include "xfs_ag.h" /* Set us up with an inode's bmap. */ int xchk_setup_inode_bmap( struct xfs_scrub *sc) { int error; error = xchk_get_inode(sc); if (error) goto out; sc->ilock_flags = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL; xfs_ilock(sc->ip, sc->ilock_flags); /* * We don't want any ephemeral data fork updates sitting around * while we inspect block mappings, so wait for directio to finish * and flush dirty data if we have delalloc reservations. */ if (S_ISREG(VFS_I(sc->ip)->i_mode) && sc->sm->sm_type == XFS_SCRUB_TYPE_BMBTD) { struct address_space *mapping = VFS_I(sc->ip)->i_mapping; inode_dio_wait(VFS_I(sc->ip)); /* * Try to flush all incore state to disk before we examine the * space mappings for the data fork. Leave accumulated errors * in the mapping for the writer threads to consume. * * On ENOSPC or EIO writeback errors, we continue into the * extent mapping checks because write failures do not * necessarily imply anything about the correctness of the file * metadata. The metadata and the file data could be on * completely separate devices; a media failure might only * affect a subset of the disk, etc. We can handle delalloc * extents in the scrubber, so leaving them in memory is fine. */ error = filemap_fdatawrite(mapping); if (!error) error = filemap_fdatawait_keep_errors(mapping); if (error && (error != -ENOSPC && error != -EIO)) goto out; } /* Got the inode, lock it and we're ready to go. */ error = xchk_trans_alloc(sc, 0); if (error) goto out; sc->ilock_flags |= XFS_ILOCK_EXCL; xfs_ilock(sc->ip, XFS_ILOCK_EXCL); out: /* scrub teardown will unlock and release the inode */ return error; } /* * Inode fork block mapping (BMBT) scrubber. * More complex than the others because we have to scrub * all the extents regardless of whether or not the fork * is in btree format. */ struct xchk_bmap_info { struct xfs_scrub *sc; struct xfs_iext_cursor icur; xfs_fileoff_t lastoff; bool is_rt; bool is_shared; bool was_loaded; int whichfork; }; /* Look for a corresponding rmap for this irec. */ static inline bool xchk_bmap_get_rmap( struct xchk_bmap_info *info, struct xfs_bmbt_irec *irec, xfs_agblock_t agbno, uint64_t owner, struct xfs_rmap_irec *rmap) { xfs_fileoff_t offset; unsigned int rflags = 0; int has_rmap; int error; if (info->whichfork == XFS_ATTR_FORK) rflags |= XFS_RMAP_ATTR_FORK; if (irec->br_state == XFS_EXT_UNWRITTEN) rflags |= XFS_RMAP_UNWRITTEN; /* * CoW staging extents are owned (on disk) by the refcountbt, so * their rmaps do not have offsets. */ if (info->whichfork == XFS_COW_FORK) offset = 0; else offset = irec->br_startoff; /* * If the caller thinks this could be a shared bmbt extent (IOWs, * any data fork extent of a reflink inode) then we have to use the * range rmap lookup to make sure we get the correct owner/offset. */ if (info->is_shared) { error = xfs_rmap_lookup_le_range(info->sc->sa.rmap_cur, agbno, owner, offset, rflags, rmap, &has_rmap); } else { error = xfs_rmap_lookup_le(info->sc->sa.rmap_cur, agbno, owner, offset, rflags, rmap, &has_rmap); } if (!xchk_should_check_xref(info->sc, &error, &info->sc->sa.rmap_cur)) return false; if (!has_rmap) xchk_fblock_xref_set_corrupt(info->sc, info->whichfork, irec->br_startoff); return has_rmap; } static inline bool xchk_bmap_has_prev( struct xchk_bmap_info *info, struct xfs_bmbt_irec *irec) { struct xfs_bmbt_irec got; struct xfs_ifork *ifp; ifp = xfs_ifork_ptr(info->sc->ip, info->whichfork); if (!xfs_iext_peek_prev_extent(ifp, &info->icur, &got)) return false; if (got.br_startoff + got.br_blockcount != irec->br_startoff) return false; if (got.br_startblock + got.br_blockcount != irec->br_startblock) return false; if (got.br_state != irec->br_state) return false; return true; } static inline bool xchk_bmap_has_next( struct xchk_bmap_info *info, struct xfs_bmbt_irec *irec) { struct xfs_bmbt_irec got; struct xfs_ifork *ifp; ifp = xfs_ifork_ptr(info->sc->ip, info->whichfork); if (!xfs_iext_peek_next_extent(ifp, &info->icur, &got)) return false; if (irec->br_startoff + irec->br_blockcount != got.br_startoff) return false; if (irec->br_startblock + irec->br_blockcount != got.br_startblock) return false; if (got.br_state != irec->br_state) return false; return true; } /* Make sure that we have rmapbt records for this extent. */ STATIC void xchk_bmap_xref_rmap( struct xchk_bmap_info *info, struct xfs_bmbt_irec *irec, xfs_agblock_t agbno) { struct xfs_rmap_irec rmap; unsigned long long rmap_end; uint64_t owner; if (!info->sc->sa.rmap_cur || xchk_skip_xref(info->sc->sm)) return; if (info->whichfork == XFS_COW_FORK) owner = XFS_RMAP_OWN_COW; else owner = info->sc->ip->i_ino; /* Find the rmap record for this irec. */ if (!xchk_bmap_get_rmap(info, irec, agbno, owner, &rmap)) return; /* Check the rmap. */ rmap_end = (unsigned long long)rmap.rm_startblock + rmap.rm_blockcount; if (rmap.rm_startblock > agbno || agbno + irec->br_blockcount > rmap_end) xchk_fblock_xref_set_corrupt(info->sc, info->whichfork, irec->br_startoff); /* * Check the logical offsets if applicable. CoW staging extents * don't track logical offsets since the mappings only exist in * memory. */ if (info->whichfork != XFS_COW_FORK) { rmap_end = (unsigned long long)rmap.rm_offset + rmap.rm_blockcount; if (rmap.rm_offset > irec->br_startoff || irec->br_startoff + irec->br_blockcount > rmap_end) xchk_fblock_xref_set_corrupt(info->sc, info->whichfork, irec->br_startoff); } if (rmap.rm_owner != owner) xchk_fblock_xref_set_corrupt(info->sc, info->whichfork, irec->br_startoff); /* * Check for discrepancies between the unwritten flag in the irec and * the rmap. Note that the (in-memory) CoW fork distinguishes between * unwritten and written extents, but we don't track that in the rmap * records because the blocks are owned (on-disk) by the refcountbt, * which doesn't track unwritten state. */ if (owner != XFS_RMAP_OWN_COW && !!(irec->br_state == XFS_EXT_UNWRITTEN) != !!(rmap.rm_flags & XFS_RMAP_UNWRITTEN)) xchk_fblock_xref_set_corrupt(info->sc, info->whichfork, irec->br_startoff); if (!!(info->whichfork == XFS_ATTR_FORK) != !!(rmap.rm_flags & XFS_RMAP_ATTR_FORK)) xchk_fblock_xref_set_corrupt(info->sc, info->whichfork, irec->br_startoff); if (rmap.rm_flags & XFS_RMAP_BMBT_BLOCK) xchk_fblock_xref_set_corrupt(info->sc, info->whichfork, irec->br_startoff); /* * If the rmap starts before this bmbt record, make sure there's a bmbt * record for the previous offset that is contiguous with this mapping. * Skip this for CoW fork extents because the refcount btree (and not * the inode) is the ondisk owner for those extents. */ if (info->whichfork != XFS_COW_FORK && rmap.rm_startblock < agbno && !xchk_bmap_has_prev(info, irec)) { xchk_fblock_xref_set_corrupt(info->sc, info->whichfork, irec->br_startoff); return; } /* * If the rmap ends after this bmbt record, make sure there's a bmbt * record for the next offset that is contiguous with this mapping. * Skip this for CoW fork extents because the refcount btree (and not * the inode) is the ondisk owner for those extents. */ rmap_end = (unsigned long long)rmap.rm_startblock + rmap.rm_blockcount; if (info->whichfork != XFS_COW_FORK && rmap_end > agbno + irec->br_blockcount && !xchk_bmap_has_next(info, irec)) { xchk_fblock_xref_set_corrupt(info->sc, info->whichfork, irec->br_startoff); return; } } /* Cross-reference a single rtdev extent record. */ STATIC void xchk_bmap_rt_iextent_xref( struct xfs_inode *ip, struct xchk_bmap_info *info, struct xfs_bmbt_irec *irec) { xchk_xref_is_used_rt_space(info->sc, irec->br_startblock, irec->br_blockcount); } /* Cross-reference a single datadev extent record. */ STATIC void xchk_bmap_iextent_xref( struct xfs_inode *ip, struct xchk_bmap_info *info, struct xfs_bmbt_irec *irec) { struct xfs_mount *mp = info->sc->mp; xfs_agnumber_t agno; xfs_agblock_t agbno; xfs_extlen_t len; int error; agno = XFS_FSB_TO_AGNO(mp, irec->br_startblock); agbno = XFS_FSB_TO_AGBNO(mp, irec->br_startblock); len = irec->br_blockcount; error = xchk_ag_init_existing(info->sc, agno, &info->sc->sa); if (!xchk_fblock_process_error(info->sc, info->whichfork, irec->br_startoff, &error)) goto out_free; xchk_xref_is_used_space(info->sc, agbno, len); xchk_xref_is_not_inode_chunk(info->sc, agbno, len); xchk_bmap_xref_rmap(info, irec, agbno); switch (info->whichfork) { case XFS_DATA_FORK: if (xfs_is_reflink_inode(info->sc->ip)) break; fallthrough; case XFS_ATTR_FORK: xchk_xref_is_not_shared(info->sc, agbno, irec->br_blockcount); break; case XFS_COW_FORK: xchk_xref_is_cow_staging(info->sc, agbno, irec->br_blockcount); xchk_xref_is_not_shared(info->sc, agbno, irec->br_blockcount); break; } out_free: xchk_ag_free(info->sc, &info->sc->sa); } /* * Directories and attr forks should never have blocks that can't be addressed * by a xfs_dablk_t. */ STATIC void xchk_bmap_dirattr_extent( struct xfs_inode *ip, struct xchk_bmap_info *info, struct xfs_bmbt_irec *irec) { struct xfs_mount *mp = ip->i_mount; xfs_fileoff_t off; if (!S_ISDIR(VFS_I(ip)->i_mode) && info->whichfork != XFS_ATTR_FORK) return; if (!xfs_verify_dablk(mp, irec->br_startoff)) xchk_fblock_set_corrupt(info->sc, info->whichfork, irec->br_startoff); off = irec->br_startoff + irec->br_blockcount - 1; if (!xfs_verify_dablk(mp, off)) xchk_fblock_set_corrupt(info->sc, info->whichfork, off); } /* Scrub a single extent record. */ STATIC void xchk_bmap_iextent( struct xfs_inode *ip, struct xchk_bmap_info *info, struct xfs_bmbt_irec *irec) { struct xfs_mount *mp = info->sc->mp; /* * Check for out-of-order extents. This record could have come * from the incore list, for which there is no ordering check. */ if (irec->br_startoff < info->lastoff) xchk_fblock_set_corrupt(info->sc, info->whichfork, irec->br_startoff); if (!xfs_verify_fileext(mp, irec->br_startoff, irec->br_blockcount)) xchk_fblock_set_corrupt(info->sc, info->whichfork, irec->br_startoff); xchk_bmap_dirattr_extent(ip, info, irec); /* There should never be a "hole" extent in either extent list. */ if (irec->br_startblock == HOLESTARTBLOCK) xchk_fblock_set_corrupt(info->sc, info->whichfork, irec->br_startoff); /* Make sure the extent points to a valid place. */ if (irec->br_blockcount > XFS_MAX_BMBT_EXTLEN) xchk_fblock_set_corrupt(info->sc, info->whichfork, irec->br_startoff); if (info->is_rt && !xfs_verify_rtext(mp, irec->br_startblock, irec->br_blockcount)) xchk_fblock_set_corrupt(info->sc, info->whichfork, irec->br_startoff); if (!info->is_rt && !xfs_verify_fsbext(mp, irec->br_startblock, irec->br_blockcount)) xchk_fblock_set_corrupt(info->sc, info->whichfork, irec->br_startoff); /* We don't allow unwritten extents on attr forks. */ if (irec->br_state == XFS_EXT_UNWRITTEN && info->whichfork == XFS_ATTR_FORK) xchk_fblock_set_corrupt(info->sc, info->whichfork, irec->br_startoff); if (info->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT) return; if (info->is_rt) xchk_bmap_rt_iextent_xref(ip, info, irec); else xchk_bmap_iextent_xref(ip, info, irec); } /* Scrub a bmbt record. */ STATIC int xchk_bmapbt_rec( struct xchk_btree *bs, const union xfs_btree_rec *rec) { struct xfs_bmbt_irec irec; struct xfs_bmbt_irec iext_irec; struct xfs_iext_cursor icur; struct xchk_bmap_info *info = bs->private; struct xfs_inode *ip = bs->cur->bc_ino.ip; struct xfs_buf *bp = NULL; struct xfs_btree_block *block; struct xfs_ifork *ifp = xfs_ifork_ptr(ip, info->whichfork); uint64_t owner; int i; /* * Check the owners of the btree blocks up to the level below * the root since the verifiers don't do that. */ if (xfs_has_crc(bs->cur->bc_mp) && bs->cur->bc_levels[0].ptr == 1) { for (i = 0; i < bs->cur->bc_nlevels - 1; i++) { block = xfs_btree_get_block(bs->cur, i, &bp); owner = be64_to_cpu(block->bb_u.l.bb_owner); if (owner != ip->i_ino) xchk_fblock_set_corrupt(bs->sc, info->whichfork, 0); } } /* * Check that the incore extent tree contains an extent that matches * this one exactly. We validate those cached bmaps later, so we don't * need to check them here. If the incore extent tree was just loaded * from disk by the scrubber, we assume that its contents match what's * on disk (we still hold the ILOCK) and skip the equivalence check. */ if (!info->was_loaded) return 0; xfs_bmbt_disk_get_all(&rec->bmbt, &irec); if (!xfs_iext_lookup_extent(ip, ifp, irec.br_startoff, &icur, &iext_irec) || irec.br_startoff != iext_irec.br_startoff || irec.br_startblock != iext_irec.br_startblock || irec.br_blockcount != iext_irec.br_blockcount || irec.br_state != iext_irec.br_state) xchk_fblock_set_corrupt(bs->sc, info->whichfork, irec.br_startoff); return 0; } /* Scan the btree records. */ STATIC int xchk_bmap_btree( struct xfs_scrub *sc, int whichfork, struct xchk_bmap_info *info) { struct xfs_owner_info oinfo; struct xfs_ifork *ifp = xfs_ifork_ptr(sc->ip, whichfork); struct xfs_mount *mp = sc->mp; struct xfs_inode *ip = sc->ip; struct xfs_btree_cur *cur; int error; /* Load the incore bmap cache if it's not loaded. */ info->was_loaded = !xfs_need_iread_extents(ifp); error = xfs_iread_extents(sc->tp, ip, whichfork); if (!xchk_fblock_process_error(sc, whichfork, 0, &error)) goto out; /* Check the btree structure. */ cur = xfs_bmbt_init_cursor(mp, sc->tp, ip, whichfork); xfs_rmap_ino_bmbt_owner(&oinfo, ip->i_ino, whichfork); error = xchk_btree(sc, cur, xchk_bmapbt_rec, &oinfo, info); xfs_btree_del_cursor(cur, error); out: return error; } struct xchk_bmap_check_rmap_info { struct xfs_scrub *sc; int whichfork; struct xfs_iext_cursor icur; }; /* Can we find bmaps that fit this rmap? */ STATIC int xchk_bmap_check_rmap( struct xfs_btree_cur *cur, const struct xfs_rmap_irec *rec, void *priv) { struct xfs_bmbt_irec irec; struct xfs_rmap_irec check_rec; struct xchk_bmap_check_rmap_info *sbcri = priv; struct xfs_ifork *ifp; struct xfs_scrub *sc = sbcri->sc; bool have_map; /* Is this even the right fork? */ if (rec->rm_owner != sc->ip->i_ino) return 0; if ((sbcri->whichfork == XFS_ATTR_FORK) ^ !!(rec->rm_flags & XFS_RMAP_ATTR_FORK)) return 0; if (rec->rm_flags & XFS_RMAP_BMBT_BLOCK) return 0; /* Now look up the bmbt record. */ ifp = xfs_ifork_ptr(sc->ip, sbcri->whichfork); if (!ifp) { xchk_fblock_set_corrupt(sc, sbcri->whichfork, rec->rm_offset); goto out; } have_map = xfs_iext_lookup_extent(sc->ip, ifp, rec->rm_offset, &sbcri->icur, &irec); if (!have_map) xchk_fblock_set_corrupt(sc, sbcri->whichfork, rec->rm_offset); /* * bmap extent record lengths are constrained to 2^21 blocks in length * because of space constraints in the on-disk metadata structure. * However, rmap extent record lengths are constrained only by AG * length, so we have to loop through the bmbt to make sure that the * entire rmap is covered by bmbt records. */ check_rec = *rec; while (have_map) { if (irec.br_startoff != check_rec.rm_offset) xchk_fblock_set_corrupt(sc, sbcri->whichfork, check_rec.rm_offset); if (irec.br_startblock != XFS_AGB_TO_FSB(sc->mp, cur->bc_ag.pag->pag_agno, check_rec.rm_startblock)) xchk_fblock_set_corrupt(sc, sbcri->whichfork, check_rec.rm_offset); if (irec.br_blockcount > check_rec.rm_blockcount) xchk_fblock_set_corrupt(sc, sbcri->whichfork, check_rec.rm_offset); if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT) break; check_rec.rm_startblock += irec.br_blockcount; check_rec.rm_offset += irec.br_blockcount; check_rec.rm_blockcount -= irec.br_blockcount; if (check_rec.rm_blockcount == 0) break; have_map = xfs_iext_next_extent(ifp, &sbcri->icur, &irec); if (!have_map) xchk_fblock_set_corrupt(sc, sbcri->whichfork, check_rec.rm_offset); } out: if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT) return -ECANCELED; return 0; } /* Make sure each rmap has a corresponding bmbt entry. */ STATIC int xchk_bmap_check_ag_rmaps( struct xfs_scrub *sc, int whichfork, struct xfs_perag *pag) { struct xchk_bmap_check_rmap_info sbcri; struct xfs_btree_cur *cur; struct xfs_buf *agf; int error; error = xfs_alloc_read_agf(pag, sc->tp, 0, &agf); if (error) return error; cur = xfs_rmapbt_init_cursor(sc->mp, sc->tp, agf, pag); sbcri.sc = sc; sbcri.whichfork = whichfork; error = xfs_rmap_query_all(cur, xchk_bmap_check_rmap, &sbcri); if (error == -ECANCELED) error = 0; xfs_btree_del_cursor(cur, error); xfs_trans_brelse(sc->tp, agf); return error; } /* Make sure each rmap has a corresponding bmbt entry. */ STATIC int xchk_bmap_check_rmaps( struct xfs_scrub *sc, int whichfork) { struct xfs_ifork *ifp = xfs_ifork_ptr(sc->ip, whichfork); struct xfs_perag *pag; xfs_agnumber_t agno; bool zero_size; int error; if (!xfs_has_rmapbt(sc->mp) || whichfork == XFS_COW_FORK || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)) return 0; /* Don't support realtime rmap checks yet. */ if (XFS_IS_REALTIME_INODE(sc->ip) && whichfork == XFS_DATA_FORK) return 0; ASSERT(xfs_ifork_ptr(sc->ip, whichfork) != NULL); /* * Only do this for complex maps that are in btree format, or for * situations where we would seem to have a size but zero extents. * The inode repair code can zap broken iforks, which means we have * to flag this bmap as corrupt if there are rmaps that need to be * reattached. */ if (whichfork == XFS_DATA_FORK) zero_size = i_size_read(VFS_I(sc->ip)) == 0; else zero_size = false; if (ifp->if_format != XFS_DINODE_FMT_BTREE && (zero_size || ifp->if_nextents > 0)) return 0; for_each_perag(sc->mp, agno, pag) { error = xchk_bmap_check_ag_rmaps(sc, whichfork, pag); if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)) { xfs_perag_rele(pag); return error; } } return 0; } /* Scrub a delalloc reservation from the incore extent map tree. */ STATIC void xchk_bmap_iextent_delalloc( struct xfs_inode *ip, struct xchk_bmap_info *info, struct xfs_bmbt_irec *irec) { struct xfs_mount *mp = info->sc->mp; /* * Check for out-of-order extents. This record could have come * from the incore list, for which there is no ordering check. */ if (irec->br_startoff < info->lastoff) xchk_fblock_set_corrupt(info->sc, info->whichfork, irec->br_startoff); if (!xfs_verify_fileext(mp, irec->br_startoff, irec->br_blockcount)) xchk_fblock_set_corrupt(info->sc, info->whichfork, irec->br_startoff); /* Make sure the extent points to a valid place. */ if (irec->br_blockcount > XFS_MAX_BMBT_EXTLEN) xchk_fblock_set_corrupt(info->sc, info->whichfork, irec->br_startoff); } /* * Scrub an inode fork's block mappings. * * First we scan every record in every btree block, if applicable. * Then we unconditionally scan the incore extent cache. */ STATIC int xchk_bmap( struct xfs_scrub *sc, int whichfork) { struct xfs_bmbt_irec irec; struct xchk_bmap_info info = { NULL }; struct xfs_mount *mp = sc->mp; struct xfs_inode *ip = sc->ip; struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); xfs_fileoff_t endoff; int error = 0; /* Non-existent forks can be ignored. */ if (!ifp) goto out; info.is_rt = whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip); info.whichfork = whichfork; info.is_shared = whichfork == XFS_DATA_FORK && xfs_is_reflink_inode(ip); info.sc = sc; switch (whichfork) { case XFS_COW_FORK: /* No CoW forks on non-reflink inodes/filesystems. */ if (!xfs_is_reflink_inode(ip)) { xchk_ino_set_corrupt(sc, sc->ip->i_ino); goto out; } break; case XFS_ATTR_FORK: if (!xfs_has_attr(mp) && !xfs_has_attr2(mp)) xchk_ino_set_corrupt(sc, sc->ip->i_ino); break; default: ASSERT(whichfork == XFS_DATA_FORK); break; } /* Check the fork values */ switch (ifp->if_format) { case XFS_DINODE_FMT_UUID: case XFS_DINODE_FMT_DEV: case XFS_DINODE_FMT_LOCAL: /* No mappings to check. */ if (whichfork == XFS_COW_FORK) xchk_fblock_set_corrupt(sc, whichfork, 0); goto out; case XFS_DINODE_FMT_EXTENTS: break; case XFS_DINODE_FMT_BTREE: if (whichfork == XFS_COW_FORK) { xchk_fblock_set_corrupt(sc, whichfork, 0); goto out; } error = xchk_bmap_btree(sc, whichfork, &info); if (error) goto out; break; default: xchk_fblock_set_corrupt(sc, whichfork, 0); goto out; } if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT) goto out; /* Find the offset of the last extent in the mapping. */ error = xfs_bmap_last_offset(ip, &endoff, whichfork); if (!xchk_fblock_process_error(sc, whichfork, 0, &error)) goto out; /* Scrub extent records. */ info.lastoff = 0; ifp = xfs_ifork_ptr(ip, whichfork); for_each_xfs_iext(ifp, &info.icur, &irec) { if (xchk_should_terminate(sc, &error) || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)) goto out; if (irec.br_startoff >= endoff) { xchk_fblock_set_corrupt(sc, whichfork, irec.br_startoff); goto out; } if (isnullstartblock(irec.br_startblock)) xchk_bmap_iextent_delalloc(ip, &info, &irec); else xchk_bmap_iextent(ip, &info, &irec); info.lastoff = irec.br_startoff + irec.br_blockcount; } error = xchk_bmap_check_rmaps(sc, whichfork); if (!xchk_fblock_xref_process_error(sc, whichfork, 0, &error)) goto out; out: return error; } /* Scrub an inode's data fork. */ int xchk_bmap_data( struct xfs_scrub *sc) { return xchk_bmap(sc, XFS_DATA_FORK); } /* Scrub an inode's attr fork. */ int xchk_bmap_attr( struct xfs_scrub *sc) { return xchk_bmap(sc, XFS_ATTR_FORK); } /* Scrub an inode's CoW fork. */ int xchk_bmap_cow( struct xfs_scrub *sc) { if (!xfs_is_reflink_inode(sc->ip)) return -ENOENT; return xchk_bmap(sc, XFS_COW_FORK); } |