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