1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2017-2023 Oracle. All Rights Reserved. 4 * Author: Darrick J. Wong <djwong@kernel.org> 5 */ 6 #include "xfs.h" 7 #include "xfs_fs.h" 8 #include "xfs_shared.h" 9 #include "xfs_format.h" 10 #include "xfs_trans_resv.h" 11 #include "xfs_mount.h" 12 #include "xfs_btree.h" 13 #include "xfs_log_format.h" 14 #include "xfs_trans.h" 15 #include "xfs_ag.h" 16 #include "xfs_inode.h" 17 #include "xfs_ialloc.h" 18 #include "xfs_icache.h" 19 #include "xfs_da_format.h" 20 #include "xfs_reflink.h" 21 #include "xfs_rmap.h" 22 #include "xfs_bmap_util.h" 23 #include "xfs_rtbitmap.h" 24 #include "scrub/scrub.h" 25 #include "scrub/common.h" 26 #include "scrub/btree.h" 27 #include "scrub/trace.h" 28 #include "scrub/repair.h" 29 30 /* Prepare the attached inode for scrubbing. */ 31 static inline int 32 xchk_prepare_iscrub( 33 struct xfs_scrub *sc) 34 { 35 int error; 36 37 xchk_ilock(sc, XFS_IOLOCK_EXCL); 38 39 error = xchk_trans_alloc(sc, 0); 40 if (error) 41 return error; 42 43 error = xchk_ino_dqattach(sc); 44 if (error) 45 return error; 46 47 xchk_ilock(sc, XFS_ILOCK_EXCL); 48 return 0; 49 } 50 51 /* Install this scrub-by-handle inode and prepare it for scrubbing. */ 52 static inline int 53 xchk_install_handle_iscrub( 54 struct xfs_scrub *sc, 55 struct xfs_inode *ip) 56 { 57 int error; 58 59 error = xchk_install_handle_inode(sc, ip); 60 if (error) 61 return error; 62 63 return xchk_prepare_iscrub(sc); 64 } 65 66 /* 67 * Grab total control of the inode metadata. In the best case, we grab the 68 * incore inode and take all locks on it. If the incore inode cannot be 69 * constructed due to corruption problems, lock the AGI so that we can single 70 * step the loading process to fix everything that can go wrong. 71 */ 72 int 73 xchk_setup_inode( 74 struct xfs_scrub *sc) 75 { 76 struct xfs_imap imap; 77 struct xfs_inode *ip; 78 struct xfs_mount *mp = sc->mp; 79 struct xfs_inode *ip_in = XFS_I(file_inode(sc->file)); 80 struct xfs_buf *agi_bp; 81 struct xfs_perag *pag; 82 xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, sc->sm->sm_ino); 83 int error; 84 85 if (xchk_need_intent_drain(sc)) 86 xchk_fsgates_enable(sc, XCHK_FSGATES_DRAIN); 87 88 /* We want to scan the opened inode, so lock it and exit. */ 89 if (sc->sm->sm_ino == 0 || sc->sm->sm_ino == ip_in->i_ino) { 90 error = xchk_install_live_inode(sc, ip_in); 91 if (error) 92 return error; 93 94 return xchk_prepare_iscrub(sc); 95 } 96 97 /* Reject internal metadata files and obviously bad inode numbers. */ 98 if (xfs_internal_inum(mp, sc->sm->sm_ino)) 99 return -ENOENT; 100 if (!xfs_verify_ino(sc->mp, sc->sm->sm_ino)) 101 return -ENOENT; 102 103 /* Try a safe untrusted iget. */ 104 error = xchk_iget_safe(sc, sc->sm->sm_ino, &ip); 105 if (!error) 106 return xchk_install_handle_iscrub(sc, ip); 107 if (error == -ENOENT) 108 return error; 109 if (error != -EFSCORRUPTED && error != -EFSBADCRC && error != -EINVAL) 110 goto out_error; 111 112 /* 113 * EINVAL with IGET_UNTRUSTED probably means one of several things: 114 * userspace gave us an inode number that doesn't correspond to fs 115 * space; the inode btree lacks a record for this inode; or there is 116 * a record, and it says this inode is free. 117 * 118 * EFSCORRUPTED/EFSBADCRC could mean that the inode was mappable, but 119 * some other metadata corruption (e.g. inode forks) prevented 120 * instantiation of the incore inode. Or it could mean the inobt is 121 * corrupt. 122 * 123 * We want to look up this inode in the inobt directly to distinguish 124 * three different scenarios: (1) the inobt says the inode is free, 125 * in which case there's nothing to do; (2) the inobt is corrupt so we 126 * should flag the corruption and exit to userspace to let it fix the 127 * inobt; and (3) the inobt says the inode is allocated, but loading it 128 * failed due to corruption. 129 * 130 * Allocate a transaction and grab the AGI to prevent inobt activity in 131 * this AG. Retry the iget in case someone allocated a new inode after 132 * the first iget failed. 133 */ 134 error = xchk_trans_alloc(sc, 0); 135 if (error) 136 goto out_error; 137 138 error = xchk_iget_agi(sc, sc->sm->sm_ino, &agi_bp, &ip); 139 if (error == 0) { 140 /* Actually got the incore inode, so install it and proceed. */ 141 xchk_trans_cancel(sc); 142 return xchk_install_handle_iscrub(sc, ip); 143 } 144 if (error == -ENOENT) 145 goto out_gone; 146 if (error != -EFSCORRUPTED && error != -EFSBADCRC && error != -EINVAL) 147 goto out_cancel; 148 149 /* Ensure that we have protected against inode allocation/freeing. */ 150 if (agi_bp == NULL) { 151 ASSERT(agi_bp != NULL); 152 error = -ECANCELED; 153 goto out_cancel; 154 } 155 156 /* 157 * Untrusted iget failed a second time. Let's try an inobt lookup. 158 * If the inobt doesn't think this is an allocated inode then we'll 159 * return ENOENT to signal that the check can be skipped. 160 * 161 * If the lookup signals corruption, we'll mark this inode corrupt and 162 * exit to userspace. There's little chance of fixing anything until 163 * the inobt is straightened out, but there's nothing we can do here. 164 * 165 * If the lookup encounters a runtime error, exit to userspace. 166 */ 167 pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, sc->sm->sm_ino)); 168 if (!pag) { 169 error = -EFSCORRUPTED; 170 goto out_cancel; 171 } 172 173 error = xfs_imap(pag, sc->tp, sc->sm->sm_ino, &imap, 174 XFS_IGET_UNTRUSTED); 175 xfs_perag_put(pag); 176 if (error == -EINVAL || error == -ENOENT) 177 goto out_gone; 178 if (error) 179 goto out_cancel; 180 181 /* 182 * The lookup succeeded. Chances are the ondisk inode is corrupt and 183 * preventing iget from reading it. Retain the scrub transaction and 184 * the AGI buffer to prevent anyone from allocating or freeing inodes. 185 * This ensures that we preserve the inconsistency between the inobt 186 * saying the inode is allocated and the icache being unable to load 187 * the inode until we can flag the corruption in xchk_inode. The 188 * scrub function has to note the corruption, since we're not really 189 * supposed to do that from the setup function. Save the mapping to 190 * make repairs to the ondisk inode buffer. 191 */ 192 if (xchk_could_repair(sc)) 193 xrep_setup_inode(sc, &imap); 194 return 0; 195 196 out_cancel: 197 xchk_trans_cancel(sc); 198 out_error: 199 trace_xchk_op_error(sc, agno, XFS_INO_TO_AGBNO(mp, sc->sm->sm_ino), 200 error, __return_address); 201 return error; 202 out_gone: 203 /* The file is gone, so there's nothing to check. */ 204 xchk_trans_cancel(sc); 205 return -ENOENT; 206 } 207 208 /* Inode core */ 209 210 /* Validate di_extsize hint. */ 211 STATIC void 212 xchk_inode_extsize( 213 struct xfs_scrub *sc, 214 struct xfs_dinode *dip, 215 xfs_ino_t ino, 216 uint16_t mode, 217 uint16_t flags) 218 { 219 xfs_failaddr_t fa; 220 uint32_t value = be32_to_cpu(dip->di_extsize); 221 222 fa = xfs_inode_validate_extsize(sc->mp, value, mode, flags); 223 if (fa) 224 xchk_ino_set_corrupt(sc, ino); 225 226 /* 227 * XFS allows a sysadmin to change the rt extent size when adding a rt 228 * section to a filesystem after formatting. If there are any 229 * directories with extszinherit and rtinherit set, the hint could 230 * become misaligned with the new rextsize. The verifier doesn't check 231 * this, because we allow rtinherit directories even without an rt 232 * device. Flag this as an administrative warning since we will clean 233 * this up eventually. 234 */ 235 if ((flags & XFS_DIFLAG_RTINHERIT) && 236 (flags & XFS_DIFLAG_EXTSZINHERIT) && 237 xfs_extlen_to_rtxmod(sc->mp, value) > 0) 238 xchk_ino_set_warning(sc, ino); 239 } 240 241 /* 242 * Validate di_cowextsize hint. 243 * 244 * The rules are documented at xfs_ioctl_setattr_check_cowextsize(). 245 * These functions must be kept in sync with each other. 246 */ 247 STATIC void 248 xchk_inode_cowextsize( 249 struct xfs_scrub *sc, 250 struct xfs_dinode *dip, 251 xfs_ino_t ino, 252 uint16_t mode, 253 uint16_t flags, 254 uint64_t flags2) 255 { 256 xfs_failaddr_t fa; 257 258 fa = xfs_inode_validate_cowextsize(sc->mp, 259 be32_to_cpu(dip->di_cowextsize), mode, flags, 260 flags2); 261 if (fa) 262 xchk_ino_set_corrupt(sc, ino); 263 } 264 265 /* Make sure the di_flags make sense for the inode. */ 266 STATIC void 267 xchk_inode_flags( 268 struct xfs_scrub *sc, 269 struct xfs_dinode *dip, 270 xfs_ino_t ino, 271 uint16_t mode, 272 uint16_t flags) 273 { 274 struct xfs_mount *mp = sc->mp; 275 276 /* di_flags are all taken, last bit cannot be used */ 277 if (flags & ~XFS_DIFLAG_ANY) 278 goto bad; 279 280 /* rt flags require rt device */ 281 if ((flags & XFS_DIFLAG_REALTIME) && !mp->m_rtdev_targp) 282 goto bad; 283 284 /* new rt bitmap flag only valid for rbmino */ 285 if ((flags & XFS_DIFLAG_NEWRTBM) && ino != mp->m_sb.sb_rbmino) 286 goto bad; 287 288 /* directory-only flags */ 289 if ((flags & (XFS_DIFLAG_RTINHERIT | 290 XFS_DIFLAG_EXTSZINHERIT | 291 XFS_DIFLAG_PROJINHERIT | 292 XFS_DIFLAG_NOSYMLINKS)) && 293 !S_ISDIR(mode)) 294 goto bad; 295 296 /* file-only flags */ 297 if ((flags & (XFS_DIFLAG_REALTIME | FS_XFLAG_EXTSIZE)) && 298 !S_ISREG(mode)) 299 goto bad; 300 301 /* filestreams and rt make no sense */ 302 if ((flags & XFS_DIFLAG_FILESTREAM) && (flags & XFS_DIFLAG_REALTIME)) 303 goto bad; 304 305 return; 306 bad: 307 xchk_ino_set_corrupt(sc, ino); 308 } 309 310 /* Make sure the di_flags2 make sense for the inode. */ 311 STATIC void 312 xchk_inode_flags2( 313 struct xfs_scrub *sc, 314 struct xfs_dinode *dip, 315 xfs_ino_t ino, 316 uint16_t mode, 317 uint16_t flags, 318 uint64_t flags2) 319 { 320 struct xfs_mount *mp = sc->mp; 321 322 /* Unknown di_flags2 could be from a future kernel */ 323 if (flags2 & ~XFS_DIFLAG2_ANY) 324 xchk_ino_set_warning(sc, ino); 325 326 /* reflink flag requires reflink feature */ 327 if ((flags2 & XFS_DIFLAG2_REFLINK) && 328 !xfs_has_reflink(mp)) 329 goto bad; 330 331 /* cowextsize flag is checked w.r.t. mode separately */ 332 333 /* file/dir-only flags */ 334 if ((flags2 & XFS_DIFLAG2_DAX) && !(S_ISREG(mode) || S_ISDIR(mode))) 335 goto bad; 336 337 /* file-only flags */ 338 if ((flags2 & XFS_DIFLAG2_REFLINK) && !S_ISREG(mode)) 339 goto bad; 340 341 /* realtime and reflink make no sense, currently */ 342 if ((flags & XFS_DIFLAG_REALTIME) && (flags2 & XFS_DIFLAG2_REFLINK)) 343 goto bad; 344 345 /* no bigtime iflag without the bigtime feature */ 346 if (xfs_dinode_has_bigtime(dip) && !xfs_has_bigtime(mp)) 347 goto bad; 348 349 /* no large extent counts without the filesystem feature */ 350 if ((flags2 & XFS_DIFLAG2_NREXT64) && !xfs_has_large_extent_counts(mp)) 351 goto bad; 352 353 return; 354 bad: 355 xchk_ino_set_corrupt(sc, ino); 356 } 357 358 static inline void 359 xchk_dinode_nsec( 360 struct xfs_scrub *sc, 361 xfs_ino_t ino, 362 struct xfs_dinode *dip, 363 const xfs_timestamp_t ts) 364 { 365 struct timespec64 tv; 366 367 tv = xfs_inode_from_disk_ts(dip, ts); 368 if (tv.tv_nsec < 0 || tv.tv_nsec >= NSEC_PER_SEC) 369 xchk_ino_set_corrupt(sc, ino); 370 } 371 372 /* Scrub all the ondisk inode fields. */ 373 STATIC void 374 xchk_dinode( 375 struct xfs_scrub *sc, 376 struct xfs_dinode *dip, 377 xfs_ino_t ino) 378 { 379 struct xfs_mount *mp = sc->mp; 380 size_t fork_recs; 381 unsigned long long isize; 382 uint64_t flags2; 383 xfs_extnum_t nextents; 384 xfs_extnum_t naextents; 385 prid_t prid; 386 uint16_t flags; 387 uint16_t mode; 388 389 flags = be16_to_cpu(dip->di_flags); 390 if (dip->di_version >= 3) 391 flags2 = be64_to_cpu(dip->di_flags2); 392 else 393 flags2 = 0; 394 395 /* di_mode */ 396 mode = be16_to_cpu(dip->di_mode); 397 switch (mode & S_IFMT) { 398 case S_IFLNK: 399 case S_IFREG: 400 case S_IFDIR: 401 case S_IFCHR: 402 case S_IFBLK: 403 case S_IFIFO: 404 case S_IFSOCK: 405 /* mode is recognized */ 406 break; 407 default: 408 xchk_ino_set_corrupt(sc, ino); 409 break; 410 } 411 412 /* v1/v2 fields */ 413 switch (dip->di_version) { 414 case 1: 415 /* 416 * We autoconvert v1 inodes into v2 inodes on writeout, 417 * so just mark this inode for preening. 418 */ 419 xchk_ino_set_preen(sc, ino); 420 prid = 0; 421 break; 422 case 2: 423 case 3: 424 if (dip->di_onlink != 0) 425 xchk_ino_set_corrupt(sc, ino); 426 427 if (dip->di_mode == 0 && sc->ip) 428 xchk_ino_set_corrupt(sc, ino); 429 430 if (dip->di_projid_hi != 0 && 431 !xfs_has_projid32(mp)) 432 xchk_ino_set_corrupt(sc, ino); 433 434 prid = be16_to_cpu(dip->di_projid_lo); 435 break; 436 default: 437 xchk_ino_set_corrupt(sc, ino); 438 return; 439 } 440 441 if (xfs_has_projid32(mp)) 442 prid |= (prid_t)be16_to_cpu(dip->di_projid_hi) << 16; 443 444 /* 445 * di_uid/di_gid -- -1 isn't invalid, but there's no way that 446 * userspace could have created that. 447 */ 448 if (dip->di_uid == cpu_to_be32(-1U) || 449 dip->di_gid == cpu_to_be32(-1U)) 450 xchk_ino_set_warning(sc, ino); 451 452 /* 453 * project id of -1 isn't supposed to be valid, but the kernel didn't 454 * always validate that. 455 */ 456 if (prid == -1U) 457 xchk_ino_set_warning(sc, ino); 458 459 /* di_format */ 460 switch (dip->di_format) { 461 case XFS_DINODE_FMT_DEV: 462 if (!S_ISCHR(mode) && !S_ISBLK(mode) && 463 !S_ISFIFO(mode) && !S_ISSOCK(mode)) 464 xchk_ino_set_corrupt(sc, ino); 465 break; 466 case XFS_DINODE_FMT_LOCAL: 467 if (!S_ISDIR(mode) && !S_ISLNK(mode)) 468 xchk_ino_set_corrupt(sc, ino); 469 break; 470 case XFS_DINODE_FMT_EXTENTS: 471 if (!S_ISREG(mode) && !S_ISDIR(mode) && !S_ISLNK(mode)) 472 xchk_ino_set_corrupt(sc, ino); 473 break; 474 case XFS_DINODE_FMT_BTREE: 475 if (!S_ISREG(mode) && !S_ISDIR(mode)) 476 xchk_ino_set_corrupt(sc, ino); 477 break; 478 case XFS_DINODE_FMT_UUID: 479 default: 480 xchk_ino_set_corrupt(sc, ino); 481 break; 482 } 483 484 /* di_[amc]time.nsec */ 485 xchk_dinode_nsec(sc, ino, dip, dip->di_atime); 486 xchk_dinode_nsec(sc, ino, dip, dip->di_mtime); 487 xchk_dinode_nsec(sc, ino, dip, dip->di_ctime); 488 489 /* 490 * di_size. xfs_dinode_verify checks for things that screw up 491 * the VFS such as the upper bit being set and zero-length 492 * symlinks/directories, but we can do more here. 493 */ 494 isize = be64_to_cpu(dip->di_size); 495 if (isize & (1ULL << 63)) 496 xchk_ino_set_corrupt(sc, ino); 497 498 /* Devices, fifos, and sockets must have zero size */ 499 if (!S_ISDIR(mode) && !S_ISREG(mode) && !S_ISLNK(mode) && isize != 0) 500 xchk_ino_set_corrupt(sc, ino); 501 502 /* Directories can't be larger than the data section size (32G) */ 503 if (S_ISDIR(mode) && (isize == 0 || isize >= XFS_DIR2_SPACE_SIZE)) 504 xchk_ino_set_corrupt(sc, ino); 505 506 /* Symlinks can't be larger than SYMLINK_MAXLEN */ 507 if (S_ISLNK(mode) && (isize == 0 || isize >= XFS_SYMLINK_MAXLEN)) 508 xchk_ino_set_corrupt(sc, ino); 509 510 /* 511 * Warn if the running kernel can't handle the kinds of offsets 512 * needed to deal with the file size. In other words, if the 513 * pagecache can't cache all the blocks in this file due to 514 * overly large offsets, flag the inode for admin review. 515 */ 516 if (isize > mp->m_super->s_maxbytes) 517 xchk_ino_set_warning(sc, ino); 518 519 /* di_nblocks */ 520 if (flags2 & XFS_DIFLAG2_REFLINK) { 521 ; /* nblocks can exceed dblocks */ 522 } else if (flags & XFS_DIFLAG_REALTIME) { 523 /* 524 * nblocks is the sum of data extents (in the rtdev), 525 * attr extents (in the datadev), and both forks' bmbt 526 * blocks (in the datadev). This clumsy check is the 527 * best we can do without cross-referencing with the 528 * inode forks. 529 */ 530 if (be64_to_cpu(dip->di_nblocks) >= 531 mp->m_sb.sb_dblocks + mp->m_sb.sb_rblocks) 532 xchk_ino_set_corrupt(sc, ino); 533 } else { 534 if (be64_to_cpu(dip->di_nblocks) >= mp->m_sb.sb_dblocks) 535 xchk_ino_set_corrupt(sc, ino); 536 } 537 538 xchk_inode_flags(sc, dip, ino, mode, flags); 539 540 xchk_inode_extsize(sc, dip, ino, mode, flags); 541 542 nextents = xfs_dfork_data_extents(dip); 543 naextents = xfs_dfork_attr_extents(dip); 544 545 /* di_nextents */ 546 fork_recs = XFS_DFORK_DSIZE(dip, mp) / sizeof(struct xfs_bmbt_rec); 547 switch (dip->di_format) { 548 case XFS_DINODE_FMT_EXTENTS: 549 if (nextents > fork_recs) 550 xchk_ino_set_corrupt(sc, ino); 551 break; 552 case XFS_DINODE_FMT_BTREE: 553 if (nextents <= fork_recs) 554 xchk_ino_set_corrupt(sc, ino); 555 break; 556 default: 557 if (nextents != 0) 558 xchk_ino_set_corrupt(sc, ino); 559 break; 560 } 561 562 /* di_forkoff */ 563 if (XFS_DFORK_BOFF(dip) >= mp->m_sb.sb_inodesize) 564 xchk_ino_set_corrupt(sc, ino); 565 if (naextents != 0 && dip->di_forkoff == 0) 566 xchk_ino_set_corrupt(sc, ino); 567 if (dip->di_forkoff == 0 && dip->di_aformat != XFS_DINODE_FMT_EXTENTS) 568 xchk_ino_set_corrupt(sc, ino); 569 570 /* di_aformat */ 571 if (dip->di_aformat != XFS_DINODE_FMT_LOCAL && 572 dip->di_aformat != XFS_DINODE_FMT_EXTENTS && 573 dip->di_aformat != XFS_DINODE_FMT_BTREE) 574 xchk_ino_set_corrupt(sc, ino); 575 576 /* di_anextents */ 577 fork_recs = XFS_DFORK_ASIZE(dip, mp) / sizeof(struct xfs_bmbt_rec); 578 switch (dip->di_aformat) { 579 case XFS_DINODE_FMT_EXTENTS: 580 if (naextents > fork_recs) 581 xchk_ino_set_corrupt(sc, ino); 582 break; 583 case XFS_DINODE_FMT_BTREE: 584 if (naextents <= fork_recs) 585 xchk_ino_set_corrupt(sc, ino); 586 break; 587 default: 588 if (naextents != 0) 589 xchk_ino_set_corrupt(sc, ino); 590 } 591 592 if (dip->di_version >= 3) { 593 xchk_dinode_nsec(sc, ino, dip, dip->di_crtime); 594 xchk_inode_flags2(sc, dip, ino, mode, flags, flags2); 595 xchk_inode_cowextsize(sc, dip, ino, mode, flags, 596 flags2); 597 } 598 } 599 600 /* 601 * Make sure the finobt doesn't think this inode is free. 602 * We don't have to check the inobt ourselves because we got the inode via 603 * IGET_UNTRUSTED, which checks the inobt for us. 604 */ 605 static void 606 xchk_inode_xref_finobt( 607 struct xfs_scrub *sc, 608 xfs_ino_t ino) 609 { 610 struct xfs_inobt_rec_incore rec; 611 xfs_agino_t agino; 612 int has_record; 613 int error; 614 615 if (!sc->sa.fino_cur || xchk_skip_xref(sc->sm)) 616 return; 617 618 agino = XFS_INO_TO_AGINO(sc->mp, ino); 619 620 /* 621 * Try to get the finobt record. If we can't get it, then we're 622 * in good shape. 623 */ 624 error = xfs_inobt_lookup(sc->sa.fino_cur, agino, XFS_LOOKUP_LE, 625 &has_record); 626 if (!xchk_should_check_xref(sc, &error, &sc->sa.fino_cur) || 627 !has_record) 628 return; 629 630 error = xfs_inobt_get_rec(sc->sa.fino_cur, &rec, &has_record); 631 if (!xchk_should_check_xref(sc, &error, &sc->sa.fino_cur) || 632 !has_record) 633 return; 634 635 /* 636 * Otherwise, make sure this record either doesn't cover this inode, 637 * or that it does but it's marked present. 638 */ 639 if (rec.ir_startino > agino || 640 rec.ir_startino + XFS_INODES_PER_CHUNK <= agino) 641 return; 642 643 if (rec.ir_free & XFS_INOBT_MASK(agino - rec.ir_startino)) 644 xchk_btree_xref_set_corrupt(sc, sc->sa.fino_cur, 0); 645 } 646 647 /* Cross reference the inode fields with the forks. */ 648 STATIC void 649 xchk_inode_xref_bmap( 650 struct xfs_scrub *sc, 651 struct xfs_dinode *dip) 652 { 653 xfs_extnum_t nextents; 654 xfs_filblks_t count; 655 xfs_filblks_t acount; 656 int error; 657 658 if (xchk_skip_xref(sc->sm)) 659 return; 660 661 /* Walk all the extents to check nextents/naextents/nblocks. */ 662 error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_DATA_FORK, 663 &nextents, &count); 664 if (!xchk_should_check_xref(sc, &error, NULL)) 665 return; 666 if (nextents < xfs_dfork_data_extents(dip)) 667 xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino); 668 669 error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_ATTR_FORK, 670 &nextents, &acount); 671 if (!xchk_should_check_xref(sc, &error, NULL)) 672 return; 673 if (nextents != xfs_dfork_attr_extents(dip)) 674 xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino); 675 676 /* Check nblocks against the inode. */ 677 if (count + acount != be64_to_cpu(dip->di_nblocks)) 678 xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino); 679 } 680 681 /* Cross-reference with the other btrees. */ 682 STATIC void 683 xchk_inode_xref( 684 struct xfs_scrub *sc, 685 xfs_ino_t ino, 686 struct xfs_dinode *dip) 687 { 688 xfs_agnumber_t agno; 689 xfs_agblock_t agbno; 690 int error; 691 692 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT) 693 return; 694 695 agno = XFS_INO_TO_AGNO(sc->mp, ino); 696 agbno = XFS_INO_TO_AGBNO(sc->mp, ino); 697 698 error = xchk_ag_init_existing(sc, agno, &sc->sa); 699 if (!xchk_xref_process_error(sc, agno, agbno, &error)) 700 goto out_free; 701 702 xchk_xref_is_used_space(sc, agbno, 1); 703 xchk_inode_xref_finobt(sc, ino); 704 xchk_xref_is_only_owned_by(sc, agbno, 1, &XFS_RMAP_OINFO_INODES); 705 xchk_xref_is_not_shared(sc, agbno, 1); 706 xchk_xref_is_not_cow_staging(sc, agbno, 1); 707 xchk_inode_xref_bmap(sc, dip); 708 709 out_free: 710 xchk_ag_free(sc, &sc->sa); 711 } 712 713 /* 714 * If the reflink iflag disagrees with a scan for shared data fork extents, 715 * either flag an error (shared extents w/ no flag) or a preen (flag set w/o 716 * any shared extents). We already checked for reflink iflag set on a non 717 * reflink filesystem. 718 */ 719 static void 720 xchk_inode_check_reflink_iflag( 721 struct xfs_scrub *sc, 722 xfs_ino_t ino) 723 { 724 struct xfs_mount *mp = sc->mp; 725 bool has_shared; 726 int error; 727 728 if (!xfs_has_reflink(mp)) 729 return; 730 731 error = xfs_reflink_inode_has_shared_extents(sc->tp, sc->ip, 732 &has_shared); 733 if (!xchk_xref_process_error(sc, XFS_INO_TO_AGNO(mp, ino), 734 XFS_INO_TO_AGBNO(mp, ino), &error)) 735 return; 736 if (xfs_is_reflink_inode(sc->ip) && !has_shared) 737 xchk_ino_set_preen(sc, ino); 738 else if (!xfs_is_reflink_inode(sc->ip) && has_shared) 739 xchk_ino_set_corrupt(sc, ino); 740 } 741 742 /* Scrub an inode. */ 743 int 744 xchk_inode( 745 struct xfs_scrub *sc) 746 { 747 struct xfs_dinode di; 748 int error = 0; 749 750 /* 751 * If sc->ip is NULL, that means that the setup function called 752 * xfs_iget to look up the inode. xfs_iget returned a EFSCORRUPTED 753 * and a NULL inode, so flag the corruption error and return. 754 */ 755 if (!sc->ip) { 756 xchk_ino_set_corrupt(sc, sc->sm->sm_ino); 757 return 0; 758 } 759 760 /* Scrub the inode core. */ 761 xfs_inode_to_disk(sc->ip, &di, 0); 762 xchk_dinode(sc, &di, sc->ip->i_ino); 763 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT) 764 goto out; 765 766 /* 767 * Look for discrepancies between file's data blocks and the reflink 768 * iflag. We already checked the iflag against the file mode when 769 * we scrubbed the dinode. 770 */ 771 if (S_ISREG(VFS_I(sc->ip)->i_mode)) 772 xchk_inode_check_reflink_iflag(sc, sc->ip->i_ino); 773 774 xchk_inode_xref(sc, sc->ip->i_ino, &di); 775 out: 776 return error; 777 } 778